diff options
Diffstat (limited to 'package/libnl-tiny/src')
43 files changed, 9075 insertions, 0 deletions
diff --git a/package/libnl-tiny/src/Makefile b/package/libnl-tiny/src/Makefile new file mode 100644 index 0000000..f684155 --- /dev/null +++ b/package/libnl-tiny/src/Makefile @@ -0,0 +1,17 @@ +CC=gcc +WFLAGS=-Wall +CFLAGS=-O2 +INCLUDES=-Iinclude + +LIBNAME=libnl-tiny.so + +all: $(LIBNAME) + +%.o: %.c + $(CC) $(WFLAGS) -c -o $@ $(INCLUDES) $(CFLAGS) $< + +LIBNL_OBJ=nl.o handlers.o msg.o attr.o cache.o cache_mngt.o object.o socket.o error.o +GENL_OBJ=genl.o genl_family.o genl_ctrl.o genl_mngt.o + +$(LIBNAME): $(LIBNL_OBJ) $(GENL_OBJ) + $(CC) -shared -o $@ $^ diff --git a/package/libnl-tiny/src/attr.c b/package/libnl-tiny/src/attr.c new file mode 100644 index 0000000..e0f5061 --- /dev/null +++ b/package/libnl-tiny/src/attr.c @@ -0,0 +1,668 @@ +/* + * lib/attr.c Netlink Attributes + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/addr.h> +#include <netlink/attr.h> +#include <netlink/msg.h> +#include <linux/socket.h> + +/** + * @ingroup msg + * @defgroup attr Attributes + * Netlink Attributes Construction/Parsing Interface + * + * \section attr_sec Netlink Attributes + * Netlink attributes allow for data chunks of arbitary length to be + * attached to a netlink message. Each attribute is encoded with a + * type and length field, both 16 bits, stored in the attribute header + * preceding the attribute data. The main advantage of using attributes + * over packing everything into the family header is that the interface + * stays extendable as new attributes can supersede old attributes while + * remaining backwards compatible. Also attributes can be defined optional + * thus avoiding the transmission of unnecessary empty data blocks. + * Special nested attributes allow for more complex data structures to + * be transmitted, e.g. trees, lists, etc. + * + * While not required, netlink attributes typically follow the family + * header of a netlink message and must be properly aligned to NLA_ALIGNTO: + * @code + * +----------------+- - -+---------------+- - -+------------+- - -+ + * | Netlink Header | Pad | Family Header | Pad | Attributes | Pad | + * +----------------+- - -+---------------+- - -+------------+- - -+ + * @endcode + * + * The actual attributes are chained together each separately aligned to + * NLA_ALIGNTO. The position of an attribute is defined based on the + * length field of the preceding attributes: + * @code + * +-------------+- - -+-------------+- - -+------ + * | Attribute 1 | Pad | Attribute 2 | Pad | ... + * +-------------+- - -+-------------+- - -+------ + * nla_next(attr1)------^ + * @endcode + * + * The attribute itself consists of the attribute header followed by + * the actual payload also aligned to NLA_ALIGNTO. The function nla_data() + * returns a pointer to the start of the payload while nla_len() returns + * the length of the payload in bytes. + * + * \b Note: Be aware, NLA_ALIGNTO equals to 4 bytes, therefore it is not + * safe to dereference any 64 bit data types directly. + * + * @code + * <----------- nla_total_size(payload) -----------> + * <-------- nla_attr_size(payload) ---------> + * +------------------+- - -+- - - - - - - - - +- - -+ + * | Attribute Header | Pad | Payload | Pad | + * +------------------+- - -+- - - - - - - - - +- - -+ + * nla_data(nla)-------------^ + * <- nla_len(nla) -> + * @endcode + * + * @subsection attr_datatypes Attribute Data Types + * A number of basic data types are supported to simplify access and + * validation of netlink attributes. This data type information is + * not encoded in the attribute, both the kernel and userspace part + * are required to share this information on their own. + * + * One of the major advantages of these basic types is the automatic + * validation of each attribute based on an attribute policy. The + * validation covers most of the checks required to safely use + * attributes and thus keeps the individual sanity check to a minimum. + * + * Never access attribute payload without ensuring basic validation + * first, attributes may: + * - not be present even though required + * - contain less actual payload than expected + * - fake a attribute length which exceeds the end of the message + * - contain unterminated character strings + * + * Policies are defined as array of the struct nla_policy. The array is + * indexed with the attribute type, therefore the array must be sized + * accordingly. + * @code + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_FOO] = { .type = ..., .minlen = ..., .maxlen = ... }, + * }; + * + * err = nla_validate(attrs, attrlen, ATTR_MAX, &my_policy); + * @endcode + * + * Some basic validations are performed on every attribute, regardless of type. + * - If the attribute type exceeds the maximum attribute type specified or + * the attribute type is lesser-or-equal than zero, the attribute will + * be silently ignored. + * - If the payload length falls below the \a minlen value the attribute + * will be rejected. + * - If \a maxlen is non-zero and the payload length exceeds the \a maxlen + * value the attribute will be rejected. + * + * + * @par Unspecific Attribute (NLA_UNSPEC) + * This is the standard type if no type is specified. It is used for + * binary data of arbitary length. Typically this attribute carries + * a binary structure or a stream of bytes. + * @par + * @code + * // In this example, we will assume a binary structure requires to + * // be transmitted. The definition of the structure will typically + * // go into a header file available to both the kernel and userspace + * // side. + * // + * // Note: Be careful when putting 64 bit data types into a structure. + * // The attribute payload is only aligned to 4 bytes, dereferencing + * // the member may fail. + * struct my_struct { + * int a; + * int b; + * }; + * + * // The validation function will not enforce an exact length match to + * // allow structures to grow as required. Note: While it is allowed + * // to add members to the end of the structure, changing the order or + * // inserting members in the middle of the structure will break your + * // binary interface. + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_MY_STRICT] = { .type = NLA_UNSPEC, + * .minlen = sizeof(struct my_struct) }, + * + * // The binary structure is appened to the message using nla_put() + * struct my_struct foo = { .a = 1, .b = 2 }; + * nla_put(msg, ATTR_MY_STRUCT, sizeof(foo), &foo); + * + * // On the receiving side, a pointer to the structure pointing inside + * // the message payload is returned by nla_get(). + * if (attrs[ATTR_MY_STRUCT]) + * struct my_struct *foo = nla_get(attrs[ATTR_MY_STRUCT]); + * @endcode + * + * @par Integers (NLA_U8, NLA_U16, NLA_U32, NLA_U64) + * Integers come in different sizes from 8 bit to 64 bit. However, since the + * payload length is aligned to 4 bytes, integers smaller than 32 bit are + * only useful to enforce the maximum range of values. + * @par + * \b Note: There is no difference made between signed and unsigned integers. + * The validation only enforces the minimal payload length required to store + * an integer of specified type. + * @par + * @code + * // Even though possible, it does not make sense to specify .minlen or + * // .maxlen for integer types. The data types implies the corresponding + * // minimal payload length. + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_FOO] = { .type = NLA_U32 }, + * + * // Numeric values can be appended directly using the respective + * // nla_put_uxxx() function + * nla_put_u32(msg, ATTR_FOO, 123); + * + * // Same for the receiving side. + * if (attrs[ATTR_FOO]) + * uint32_t foo = nla_get_u32(attrs[ATTR_FOO]); + * @endcode + * + * @par Character string (NLA_STRING) + * This data type represents a NUL terminated character string of variable + * length. For binary data streams the type NLA_UNSPEC is recommended. + * @par + * @code + * // Enforce a NUL terminated character string of at most 4 characters + * // including the NUL termination. + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_BAR] = { .type = NLA_STRING, maxlen = 4 }, + * + * // nla_put_string() creates a string attribute of the necessary length + * // and appends it to the message including the NUL termination. + * nla_put_string(msg, ATTR_BAR, "some text"); + * + * // It is safe to use the returned character string directly if the + * // attribute has been validated as the validation enforces the proper + * // termination of the string. + * if (attrs[ATTR_BAR]) + * char *text = nla_get_string(attrs[ATTR_BAR]); + * @endcode + * + * @par Flag (NLA_FLAG) + * This attribute type may be used to indicate the presence of a flag. The + * attribute is only valid if the payload length is zero. The presence of + * the attribute header indicates the presence of the flag. + * @par + * @code + * // This attribute type is special as .minlen and .maxlen have no effect. + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_FLAG] = { .type = NLA_FLAG }, + * + * // nla_put_flag() appends a zero sized attribute to the message. + * nla_put_flag(msg, ATTR_FLAG); + * + * // There is no need for a receival function, the presence is the value. + * if (attrs[ATTR_FLAG]) + * // flag is present + * @endcode + * + * @par Micro Seconds (NLA_MSECS) + * + * @par Nested Attribute (NLA_NESTED) + * Attributes can be nested and put into a container to create groups, lists + * or to construct trees of attributes. Nested attributes are often used to + * pass attributes to a subsystem where the top layer has no knowledge of the + * configuration possibilities of each subsystem. + * @par + * \b Note: When validating the attributes using nlmsg_validate() or + * nlmsg_parse() it will only affect the top level attributes. Each + * level of nested attributes must be validated seperately using + * nla_parse_nested() or nla_validate(). + * @par + * @code + * // The minimal length policy may be used to enforce the presence of at + * // least one attribute. + * static struct nla_policy my_policy[ATTR_MAX+1] = { + * [ATTR_OPTS] = { .type = NLA_NESTED, minlen = NLA_HDRLEN }, + * + * // Nested attributes are constructed by enclosing the attributes + * // to be nested with calls to nla_nest_start() respetively nla_nest_end(). + * struct nlattr *opts = nla_nest_start(msg, ATTR_OPTS); + * nla_put_u32(msg, ATTR_FOO, 123); + * nla_put_string(msg, ATTR_BAR, "some text"); + * nla_nest_end(msg, opts); + * + * // Various methods exist to parse nested attributes, the easiest being + * // nla_parse_nested() which also allows validation in the same step. + * if (attrs[ATTR_OPTS]) { + * struct nlattr *nested[ATTR_MAX+1]; + * + * nla_parse_nested(nested, ATTR_MAX, attrs[ATTR_OPTS], &policy); + * + * if (nested[ATTR_FOO]) + * uint32_t foo = nla_get_u32(nested[ATTR_FOO]); + * } + * @endcode + * + * @subsection attr_exceptions Exception Based Attribute Construction + * Often a large number of attributes are added to a message in a single + * function. In order to simplify error handling, a second set of + * construction functions exist which jump to a error label when they + * fail instead of returning an error code. This second set consists + * of macros which are named after their error code based counterpart + * except that the name is written all uppercase. + * + * All of the macros jump to the target \c nla_put_failure if they fail. + * @code + * void my_func(struct nl_msg *msg) + * { + * NLA_PUT_U32(msg, ATTR_FOO, 10); + * NLA_PUT_STRING(msg, ATTR_BAR, "bar"); + * + * return 0; + * + * nla_put_failure: + * return -NLE_NOMEM; + * } + * @endcode + * + * @subsection attr_examples Examples + * @par Example 1.1 Constructing a netlink message with attributes. + * @code + * struct nl_msg *build_msg(int ifindex, struct nl_addr *lladdr, int mtu) + * { + * struct nl_msg *msg; + * struct nlattr *info, *vlan; + * struct ifinfomsg ifi = { + * .ifi_family = AF_INET, + * .ifi_index = ifindex, + * }; + * + * // Allocate a new netlink message, type=RTM_SETLINK, flags=NLM_F_ECHO + * if (!(msg = nlmsg_alloc_simple(RTM_SETLINK, NLM_F_ECHO))) + * return NULL; + * + * // Append the family specific header (struct ifinfomsg) + * if (nlmsg_append(msg, &ifi, sizeof(ifi), NLMSG_ALIGNTO) < 0) + * goto nla_put_failure + * + * // Append a 32 bit integer attribute to carry the MTU + * NLA_PUT_U32(msg, IFLA_MTU, mtu); + * + * // Append a unspecific attribute to carry the link layer address + * NLA_PUT_ADDR(msg, IFLA_ADDRESS, lladdr); + * + * // Append a container for nested attributes to carry link information + * if (!(info = nla_nest_start(msg, IFLA_LINKINFO))) + * goto nla_put_failure; + * + * // Put a string attribute into the container + * NLA_PUT_STRING(msg, IFLA_INFO_KIND, "vlan"); + * + * // Append another container inside the open container to carry + * // vlan specific attributes + * if (!(vlan = nla_nest_start(msg, IFLA_INFO_DATA))) + * goto nla_put_failure; + * + * // add vlan specific info attributes here... + * + * // Finish nesting the vlan attributes and close the second container. + * nla_nest_end(msg, vlan); + * + * // Finish nesting the link info attribute and close the first container. + * nla_nest_end(msg, info); + * + * return msg; + * + * // If any of the construction macros fails, we end up here. + * nla_put_failure: + * nlmsg_free(msg); + * return NULL; + * } + * @endcode + * + * @par Example 2.1 Parsing a netlink message with attributes. + * @code + * int parse_message(struct nl_msg *msg) + * { + * // The policy defines two attributes: a 32 bit integer and a container + * // for nested attributes. + * struct nla_policy attr_policy[ATTR_MAX+1] = { + * [ATTR_FOO] = { .type = NLA_U32 }, + * [ATTR_BAR] = { .type = NLA_NESTED }, + * }; + * struct nlattr *attrs[ATTR_MAX+1]; + * int err; + * + * // The nlmsg_parse() function will make sure that the message contains + * // enough payload to hold the header (struct my_hdr), validates any + * // attributes attached to the messages and stores a pointer to each + * // attribute in the attrs[] array accessable by attribute type. + * if ((err = nlmsg_parse(nlmsg_hdr(msg), sizeof(struct my_hdr), attrs, + * ATTR_MAX, attr_policy)) < 0) + * goto errout; + * + * if (attrs[ATTR_FOO]) { + * // It is safe to directly access the attribute payload without + * // any further checks since nlmsg_parse() enforced the policy. + * uint32_t foo = nla_get_u32(attrs[ATTR_FOO]); + * } + * + * if (attrs[ATTR_BAR]) { + * struct nlattr *nested[NESTED_MAX+1]; + * + * // Attributes nested in a container can be parsed the same way + * // as top level attributes. + * if ((err = nla_parse_nested(nested, NESTED_MAX, attrs[ATTR_BAR], + * nested_policy)) < 0) + * goto errout; + * + * // Process nested attributes here. + * } + * + * err = 0; + * errout: + * return err; + * } + * @endcode + * + * @{ + */ + +/** + * @name Attribute Size Calculation + * @{ + */ + +/** @} */ + +/** + * @name Parsing Attributes + * @{ + */ + +/** + * Check if the attribute header and payload can be accessed safely. + * @arg nla Attribute of any kind. + * @arg remaining Number of bytes remaining in attribute stream. + * + * Verifies that the header and payload do not exceed the number of + * bytes left in the attribute stream. This function must be called + * before access the attribute header or payload when iterating over + * the attribute stream using nla_next(). + * + * @return True if the attribute can be accessed safely, false otherwise. + */ +int nla_ok(const struct nlattr *nla, int remaining) +{ + return remaining >= sizeof(*nla) && + nla->nla_len >= sizeof(*nla) && + nla->nla_len <= remaining; +} + +/** + * Return next attribute in a stream of attributes. + * @arg nla Attribute of any kind. + * @arg remaining Variable to count remaining bytes in stream. + * + * Calculates the offset to the next attribute based on the attribute + * given. The attribute provided is assumed to be accessible, the + * caller is responsible to use nla_ok() beforehand. The offset (length + * of specified attribute including padding) is then subtracted from + * the remaining bytes variable and a pointer to the next attribute is + * returned. + * + * nla_next() can be called as long as remainig is >0. + * + * @return Pointer to next attribute. + */ +struct nlattr *nla_next(const struct nlattr *nla, int *remaining) +{ + int totlen = NLA_ALIGN(nla->nla_len); + + *remaining -= totlen; + return (struct nlattr *) ((char *) nla + totlen); +} + +static uint16_t nla_attr_minlen[NLA_TYPE_MAX+1] = { + [NLA_U8] = sizeof(uint8_t), + [NLA_U16] = sizeof(uint16_t), + [NLA_U32] = sizeof(uint32_t), + [NLA_U64] = sizeof(uint64_t), + [NLA_STRING] = 1, +}; + +static int validate_nla(struct nlattr *nla, int maxtype, + struct nla_policy *policy) +{ + struct nla_policy *pt; + int minlen = 0, type = nla_type(nla); + + if (type <= 0 || type > maxtype) + return 0; + + pt = &policy[type]; + + if (pt->type > NLA_TYPE_MAX) + BUG(); + + if (pt->minlen) + minlen = pt->minlen; + else if (pt->type != NLA_UNSPEC) + minlen = nla_attr_minlen[pt->type]; + + if (pt->type == NLA_FLAG && nla_len(nla) > 0) + return -NLE_RANGE; + + if (nla_len(nla) < minlen) + return -NLE_RANGE; + + if (pt->maxlen && nla_len(nla) > pt->maxlen) + return -NLE_RANGE; + + if (pt->type == NLA_STRING) { + char *data = nla_data(nla); + if (data[nla_len(nla) - 1] != '\0') + return -NLE_INVAL; + } + + return 0; +} + + +/** + * Create attribute index based on a stream of attributes. + * @arg tb Index array to be filled (maxtype+1 elements). + * @arg maxtype Maximum attribute type expected and accepted. + * @arg head Head of attribute stream. + * @arg len Length of attribute stream. + * @arg policy Attribute validation policy. + * + * Iterates over the stream of attributes and stores a pointer to each + * attribute in the index array using the attribute type as index to + * the array. Attribute with a type greater than the maximum type + * specified will be silently ignored in order to maintain backwards + * compatibility. If \a policy is not NULL, the attribute will be + * validated using the specified policy. + * + * @see nla_validate + * @return 0 on success or a negative error code. + */ +int nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, int len, + struct nla_policy *policy) +{ + struct nlattr *nla; + int rem, err; + + memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); + + nla_for_each_attr(nla, head, len, rem) { + int type = nla_type(nla); + + if (type == 0) { + fprintf(stderr, "Illegal nla->nla_type == 0\n"); + continue; + } + + if (type <= maxtype) { + if (policy) { + err = validate_nla(nla, maxtype, policy); + if (err < 0) + goto errout; + } + + tb[type] = nla; + } + } + + if (rem > 0) + fprintf(stderr, "netlink: %d bytes leftover after parsing " + "attributes.\n", rem); + + err = 0; +errout: + return err; +} + +/** + * Validate a stream of attributes. + * @arg head Head of attributes stream. + * @arg len Length of attributes stream. + * @arg maxtype Maximum attribute type expected and accepted. + * @arg policy Validation policy. + * + * Iterates over the stream of attributes and validates each attribute + * one by one using the specified policy. Attributes with a type greater + * than the maximum type specified will be silently ignored in order to + * maintain backwards compatibility. + * + * See \ref attr_datatypes for more details on what kind of validation + * checks are performed on each attribute data type. + * + * @return 0 on success or a negative error code. + */ +int nla_validate(struct nlattr *head, int len, int maxtype, + struct nla_policy *policy) +{ + struct nlattr *nla; + int rem, err; + + nla_for_each_attr(nla, head, len, rem) { + err = validate_nla(nla, maxtype, policy); + if (err < 0) + goto errout; + } + + err = 0; +errout: + return err; +} + +/** + * Find a single attribute in a stream of attributes. + * @arg head Head of attributes stream. + * @arg len Length of attributes stream. + * @arg attrtype Attribute type to look for. + * + * Iterates over the stream of attributes and compares each type with + * the type specified. Returns the first attribute which matches the + * type. + * + * @return Pointer to attribute found or NULL. + */ +struct nlattr *nla_find(struct nlattr *head, int len, int attrtype) +{ + struct nlattr *nla; + int rem; + + nla_for_each_attr(nla, head, len, rem) + if (nla_type(nla) == attrtype) + return nla; + + return NULL; +} + +/** @} */ + +/** + * @name Unspecific Attribute + * @{ + */ + +/** + * Reserve space for a attribute. + * @arg msg Netlink Message. + * @arg attrtype Attribute Type. + * @arg attrlen Length of payload. + * + * Reserves room for a attribute in the specified netlink message and + * fills in the attribute header (type, length). Returns NULL if there + * is unsuficient space for the attribute. + * + * Any padding between payload and the start of the next attribute is + * zeroed out. + * + * @return Pointer to start of attribute or NULL on failure. + */ +struct nlattr *nla_reserve(struct nl_msg *msg, int attrtype, int attrlen) +{ + struct nlattr *nla; + int tlen; + + tlen = NLMSG_ALIGN(msg->nm_nlh->nlmsg_len) + nla_total_size(attrlen); + + if ((tlen + msg->nm_nlh->nlmsg_len) > msg->nm_size) + return NULL; + + nla = (struct nlattr *) nlmsg_tail(msg->nm_nlh); + nla->nla_type = attrtype; + nla->nla_len = nla_attr_size(attrlen); + + memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); + msg->nm_nlh->nlmsg_len = tlen; + + NL_DBG(2, "msg %p: Reserved %d bytes at offset +%td for attr %d " + "nlmsg_len=%d\n", msg, attrlen, + (void *) nla - nlmsg_data(msg->nm_nlh), + attrtype, msg->nm_nlh->nlmsg_len); + + return nla; +} + +/** + * Add a unspecific attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg datalen Length of data to be used as payload. + * @arg data Pointer to data to be used as attribute payload. + * + * Reserves room for a unspecific attribute and copies the provided data + * into the message as payload of the attribute. Returns an error if there + * is insufficient space for the attribute. + * + * @see nla_reserve + * @return 0 on success or a negative error code. + */ +int nla_put(struct nl_msg *msg, int attrtype, int datalen, const void *data) +{ + struct nlattr *nla; + + nla = nla_reserve(msg, attrtype, datalen); + if (!nla) + return -NLE_NOMEM; + + memcpy(nla_data(nla), data, datalen); + NL_DBG(2, "msg %p: Wrote %d bytes at offset +%td for attr %d\n", + msg, datalen, (void *) nla - nlmsg_data(msg->nm_nlh), attrtype); + + return 0; +} + + + +/** @} */ diff --git a/package/libnl-tiny/src/cache.c b/package/libnl-tiny/src/cache.c new file mode 100644 index 0000000..fed042d --- /dev/null +++ b/package/libnl-tiny/src/cache.c @@ -0,0 +1,841 @@ +/* + * lib/cache.c Caching Module + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup cache_mngt + * @defgroup cache Cache + * + * @code + * Cache Management | | Type Specific Cache Operations + * + * | | +----------------+ +------------+ + * | request update | | msg_parser | + * | | +----------------+ +------------+ + * +- - - - -^- - - - - - - -^- -|- - - - + * nl_cache_update: | | | | + * 1) --------- co_request_update ------+ | | + * | | | + * 2) destroy old cache +----------- pp_cb ---------|---+ + * | | | + * 3) ---------- nl_recvmsgs ----------+ +- cb_valid -+ + * +--------------+ | | | | + * | nl_cache_add |<-----+ + - - -v- -|- - - - - - - - - - - + * +--------------+ | | +-------------+ + * | nl_recvmsgs | + * | | +-----|-^-----+ + * +---v-|---+ + * | | | nl_recv | + * +---------+ + * | | Core Netlink + * @endcode + * + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/cache.h> +#include <netlink/object.h> +#include <netlink/utils.h> + +/** + * @name Access Functions + * @{ + */ + +#ifdef disabled +/** + * Return the number of items in the cache + * @arg cache cache handle + */ +int nl_cache_nitems(struct nl_cache *cache) +{ + return cache->c_nitems; +} + +/** + * Return the number of items matching a filter in the cache + * @arg cache Cache object. + * @arg filter Filter object. + */ +int nl_cache_nitems_filter(struct nl_cache *cache, struct nl_object *filter) +{ + struct nl_object_ops *ops; + struct nl_object *obj; + int nitems = 0; + + if (cache->c_ops == NULL) + BUG(); + + ops = cache->c_ops->co_obj_ops; + + nl_list_for_each_entry(obj, &cache->c_items, ce_list) { + if (filter && !nl_object_match_filter(obj, filter)) + continue; + + nitems++; + } + + return nitems; +} + +/** + * Returns \b true if the cache is empty. + * @arg cache Cache to check + * @return \a true if the cache is empty, otherwise \b false is returned. + */ +int nl_cache_is_empty(struct nl_cache *cache) +{ + return nl_list_empty(&cache->c_items); +} + +/** + * Return the operations set of the cache + * @arg cache cache handle + */ +struct nl_cache_ops *nl_cache_get_ops(struct nl_cache *cache) +{ + return cache->c_ops; +} + +/** + * Return the first element in the cache + * @arg cache cache handle + */ +struct nl_object *nl_cache_get_first(struct nl_cache *cache) +{ + if (nl_list_empty(&cache->c_items)) + return NULL; + + return nl_list_entry(cache->c_items.next, + struct nl_object, ce_list); +} + +/** + * Return the last element in the cache + * @arg cache cache handle + */ +struct nl_object *nl_cache_get_last(struct nl_cache *cache) +{ + if (nl_list_empty(&cache->c_items)) + return NULL; + + return nl_list_entry(cache->c_items.prev, + struct nl_object, ce_list); +} + +/** + * Return the next element in the cache + * @arg obj current object + */ +struct nl_object *nl_cache_get_next(struct nl_object *obj) +{ + if (nl_list_at_tail(obj, &obj->ce_cache->c_items, ce_list)) + return NULL; + else + return nl_list_entry(obj->ce_list.next, + struct nl_object, ce_list); +} + +/** + * Return the previous element in the cache + * @arg obj current object + */ +struct nl_object *nl_cache_get_prev(struct nl_object *obj) +{ + if (nl_list_at_head(obj, &obj->ce_cache->c_items, ce_list)) + return NULL; + else + return nl_list_entry(obj->ce_list.prev, + struct nl_object, ce_list); +} +#endif + +/** @} */ + +/** + * @name Cache Creation/Deletion + * @{ + */ + +/** + * Allocate an empty cache + * @arg ops cache operations to base the cache on + * + * @return A newly allocated and initialized cache. + */ +struct nl_cache *nl_cache_alloc(struct nl_cache_ops *ops) +{ + struct nl_cache *cache; + + cache = calloc(1, sizeof(*cache)); + if (!cache) + return NULL; + + nl_init_list_head(&cache->c_items); + cache->c_ops = ops; + + NL_DBG(2, "Allocated cache %p <%s>.\n", cache, nl_cache_name(cache)); + + return cache; +} + +int nl_cache_alloc_and_fill(struct nl_cache_ops *ops, struct nl_sock *sock, + struct nl_cache **result) +{ + struct nl_cache *cache; + int err; + + if (!(cache = nl_cache_alloc(ops))) + return -NLE_NOMEM; + + if (sock && (err = nl_cache_refill(sock, cache)) < 0) { + nl_cache_free(cache); + return err; + } + + *result = cache; + return 0; +} + +#ifdef disabled +/** + * Allocate an empty cache based on type name + * @arg kind Name of cache type + * @return A newly allocated and initialized cache. + */ +int nl_cache_alloc_name(const char *kind, struct nl_cache **result) +{ + struct nl_cache_ops *ops; + struct nl_cache *cache; + + ops = nl_cache_ops_lookup(kind); + if (!ops) + return -NLE_NOCACHE; + + if (!(cache = nl_cache_alloc(ops))) + return -NLE_NOMEM; + + *result = cache; + return 0; +} + +/** + * Allocate a new cache containing a subset of a cache + * @arg orig Original cache to be based on + * @arg filter Filter defining the subset to be filled into new cache + * @return A newly allocated cache or NULL. + */ +struct nl_cache *nl_cache_subset(struct nl_cache *orig, + struct nl_object *filter) +{ + struct nl_cache *cache; + struct nl_object_ops *ops; + struct nl_object *obj; + + if (!filter) + BUG(); + + cache = nl_cache_alloc(orig->c_ops); + if (!cache) + return NULL; + + ops = orig->c_ops->co_obj_ops; + + nl_list_for_each_entry(obj, &orig->c_items, ce_list) { + if (!nl_object_match_filter(obj, filter)) + continue; + + nl_cache_add(cache, obj); + } + + return cache; +} +#endif + +/** + * Clear a cache. + * @arg cache cache to clear + * + * Removes all elements of a cache. + */ +void nl_cache_clear(struct nl_cache *cache) +{ + struct nl_object *obj, *tmp; + + NL_DBG(1, "Clearing cache %p <%s>...\n", cache, nl_cache_name(cache)); + + nl_list_for_each_entry_safe(obj, tmp, &cache->c_items, ce_list) + nl_cache_remove(obj); +} + +/** + * Free a cache. + * @arg cache Cache to free. + * + * Removes all elements of a cache and frees all memory. + * + * @note Use this function if you are working with allocated caches. + */ +void nl_cache_free(struct nl_cache *cache) +{ + if (!cache) + return; + + nl_cache_clear(cache); + NL_DBG(1, "Freeing cache %p <%s>...\n", cache, nl_cache_name(cache)); + free(cache); +} + +/** @} */ + +/** + * @name Cache Modifications + * @{ + */ + +static int __cache_add(struct nl_cache *cache, struct nl_object *obj) +{ + obj->ce_cache = cache; + + nl_list_add_tail(&obj->ce_list, &cache->c_items); + cache->c_nitems++; + + NL_DBG(1, "Added %p to cache %p <%s>.\n", + obj, cache, nl_cache_name(cache)); + + return 0; +} + +/** + * Add object to a cache. + * @arg cache Cache to add object to + * @arg obj Object to be added to the cache + * + * Adds the given object to the specified cache. The object is cloned + * if it has been added to another cache already. + * + * @return 0 or a negative error code. + */ +int nl_cache_add(struct nl_cache *cache, struct nl_object *obj) +{ + struct nl_object *new; + + if (cache->c_ops->co_obj_ops != obj->ce_ops) + return -NLE_OBJ_MISMATCH; + + if (!nl_list_empty(&obj->ce_list)) { + new = nl_object_clone(obj); + if (!new) + return -NLE_NOMEM; + } else { + nl_object_get(obj); + new = obj; + } + + return __cache_add(cache, new); +} + +#ifdef disabled +/** + * Move object from one cache to another + * @arg cache Cache to move object to. + * @arg obj Object subject to be moved + * + * Removes the given object from its associated cache if needed + * and adds it to the new cache. + * + * @return 0 on success or a negative error code. + */ +int nl_cache_move(struct nl_cache *cache, struct nl_object *obj) +{ + if (cache->c_ops->co_obj_ops != obj->ce_ops) + return -NLE_OBJ_MISMATCH; + + NL_DBG(3, "Moving object %p to cache %p\n", obj, cache); + + /* Acquire reference, if already in a cache this will be + * reverted during removal */ + nl_object_get(obj); + + if (!nl_list_empty(&obj->ce_list)) + nl_cache_remove(obj); + + return __cache_add(cache, obj); +} +#endif + +/** + * Removes an object from a cache. + * @arg obj Object to remove from its cache + * + * Removes the object \c obj from the cache it is assigned to, since + * an object can only be assigned to one cache at a time, the cache + * must ne be passed along with it. + */ +void nl_cache_remove(struct nl_object *obj) +{ + struct nl_cache *cache = obj->ce_cache; + + if (cache == NULL) + return; + + nl_list_del(&obj->ce_list); + obj->ce_cache = NULL; + nl_object_put(obj); + cache->c_nitems--; + + NL_DBG(1, "Deleted %p from cache %p <%s>.\n", + obj, cache, nl_cache_name(cache)); +} + +#ifdef disabled +/** + * Search for an object in a cache + * @arg cache Cache to search in. + * @arg needle Object to look for. + * + * Iterates over the cache and looks for an object with identical + * identifiers as the needle. + * + * @return Reference to object or NULL if not found. + * @note The returned object must be returned via nl_object_put(). + */ +struct nl_object *nl_cache_search(struct nl_cache *cache, + struct nl_object *needle) +{ + struct nl_object *obj; + + nl_list_for_each_entry(obj, &cache->c_items, ce_list) { + if (nl_object_identical(obj, needle)) { + nl_object_get(obj); + return obj; + } + } + + return NULL; +} +#endif + +/** @} */ + +/** + * @name Synchronization + * @{ + */ + +/** + * Request a full dump from the kernel to fill a cache + * @arg sk Netlink socket. + * @arg cache Cache subjected to be filled. + * + * Send a dumping request to the kernel causing it to dump all objects + * related to the specified cache to the netlink socket. + * + * Use nl_cache_pickup() to read the objects from the socket and fill them + * into a cache. + */ +int nl_cache_request_full_dump(struct nl_sock *sk, struct nl_cache *cache) +{ + NL_DBG(2, "Requesting dump from kernel for cache %p <%s>...\n", + cache, nl_cache_name(cache)); + + if (cache->c_ops->co_request_update == NULL) + return -NLE_OPNOTSUPP; + + return cache->c_ops->co_request_update(cache, sk); +} + +/** @cond SKIP */ +struct update_xdata { + struct nl_cache_ops *ops; + struct nl_parser_param *params; +}; + +static int update_msg_parser(struct nl_msg *msg, void *arg) +{ + struct update_xdata *x = arg; + + return nl_cache_parse(x->ops, &msg->nm_src, msg->nm_nlh, x->params); +} +/** @endcond */ + +int __cache_pickup(struct nl_sock *sk, struct nl_cache *cache, + struct nl_parser_param *param) +{ + int err; + struct nl_cb *cb; + struct update_xdata x = { + .ops = cache->c_ops, + .params = param, + }; + + NL_DBG(1, "Picking up answer for cache %p <%s>...\n", + cache, nl_cache_name(cache)); + + cb = nl_cb_clone(sk->s_cb); + if (cb == NULL) + return -NLE_NOMEM; + + nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, update_msg_parser, &x); + + err = nl_recvmsgs(sk, cb); + if (err < 0) + NL_DBG(2, "While picking up for %p <%s>, recvmsgs() returned " \ + "%d: %s", cache, nl_cache_name(cache), + err, nl_geterror(err)); + + nl_cb_put(cb); + + return err; +} + +static int pickup_cb(struct nl_object *c, struct nl_parser_param *p) +{ + return nl_cache_add((struct nl_cache *) p->pp_arg, c); +} + +/** + * Pickup a netlink dump response and put it into a cache. + * @arg sk Netlink socket. + * @arg cache Cache to put items into. + * + * Waits for netlink messages to arrive, parses them and puts them into + * the specified cache. + * + * @return 0 on success or a negative error code. + */ +int nl_cache_pickup(struct nl_sock *sk, struct nl_cache *cache) +{ + struct nl_parser_param p = { + .pp_cb = pickup_cb, + .pp_arg = cache, + }; + + return __cache_pickup(sk, cache, &p); +} + +#ifdef disabled +static int cache_include(struct nl_cache *cache, struct nl_object *obj, + struct nl_msgtype *type, change_func_t cb) +{ + struct nl_object *old; + + switch (type->mt_act) { + case NL_ACT_NEW: + case NL_ACT_DEL: + old = nl_cache_search(cache, obj); + if (old) { + nl_cache_remove(old); + if (type->mt_act == NL_ACT_DEL) { + if (cb) + cb(cache, old, NL_ACT_DEL); + nl_object_put(old); + } + } + + if (type->mt_act == NL_ACT_NEW) { + nl_cache_move(cache, obj); + if (old == NULL && cb) + cb(cache, obj, NL_ACT_NEW); + else if (old) { + if (nl_object_diff(old, obj) && cb) + cb(cache, obj, NL_ACT_CHANGE); + + nl_object_put(old); + } + } + break; + default: + NL_DBG(2, "Unknown action associated to object %p\n", obj); + return 0; + } + + return 0; +} + +int nl_cache_include(struct nl_cache *cache, struct nl_object *obj, + change_func_t change_cb) +{ + struct nl_cache_ops *ops = cache->c_ops; + int i; + + if (ops->co_obj_ops != obj->ce_ops) + return -NLE_OBJ_MISMATCH; + + for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++) + if (ops->co_msgtypes[i].mt_id == obj->ce_msgtype) + return cache_include(cache, obj, &ops->co_msgtypes[i], + change_cb); + + return -NLE_MSGTYPE_NOSUPPORT; +} + +static int resync_cb(struct nl_object *c, struct nl_parser_param *p) +{ + struct nl_cache_assoc *ca = p->pp_arg; + + return nl_cache_include(ca->ca_cache, c, ca->ca_change); +} + +int nl_cache_resync(struct nl_sock *sk, struct nl_cache *cache, + change_func_t change_cb) +{ + struct nl_object *obj, *next; + struct nl_cache_assoc ca = { + .ca_cache = cache, + .ca_change = change_cb, + }; + struct nl_parser_param p = { + .pp_cb = resync_cb, + .pp_arg = &ca, + }; + int err; + + NL_DBG(1, "Resyncing cache %p <%s>...\n", cache, nl_cache_name(cache)); + + /* Mark all objects so we can see if some of them are obsolete */ + nl_cache_mark_all(cache); + + err = nl_cache_request_full_dump(sk, cache); + if (err < 0) + goto errout; + + err = __cache_pickup(sk, cache, &p); + if (err < 0) + goto errout; + + nl_list_for_each_entry_safe(obj, next, &cache->c_items, ce_list) + if (nl_object_is_marked(obj)) + nl_cache_remove(obj); + + NL_DBG(1, "Finished resyncing %p <%s>\n", cache, nl_cache_name(cache)); + + err = 0; +errout: + return err; +} +#endif + +/** @} */ + +/** + * @name Parsing + * @{ + */ + +/** @cond SKIP */ +int nl_cache_parse(struct nl_cache_ops *ops, struct sockaddr_nl *who, + struct nlmsghdr *nlh, struct nl_parser_param *params) +{ + int i, err; + + if (!nlmsg_valid_hdr(nlh, ops->co_hdrsize)) + return -NLE_MSG_TOOSHORT; + + for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++) { + if (ops->co_msgtypes[i].mt_id == nlh->nlmsg_type) { + err = ops->co_msg_parser(ops, who, nlh, params); + if (err != -NLE_OPNOTSUPP) + goto errout; + } + } + + + err = -NLE_MSGTYPE_NOSUPPORT; +errout: + return err; +} +/** @endcond */ + +/** + * Parse a netlink message and add it to the cache. + * @arg cache cache to add element to + * @arg msg netlink message + * + * Parses a netlink message by calling the cache specific message parser + * and adds the new element to the cache. + * + * @return 0 or a negative error code. + */ +int nl_cache_parse_and_add(struct nl_cache *cache, struct nl_msg *msg) +{ + struct nl_parser_param p = { + .pp_cb = pickup_cb, + .pp_arg = cache, + }; + + return nl_cache_parse(cache->c_ops, NULL, nlmsg_hdr(msg), &p); +} + +/** + * (Re)fill a cache with the contents in the kernel. + * @arg sk Netlink socket. + * @arg cache cache to update + * + * Clears the specified cache and fills it with the current state in + * the kernel. + * + * @return 0 or a negative error code. + */ +int nl_cache_refill(struct nl_sock *sk, struct nl_cache *cache) +{ + int err; + + err = nl_cache_request_full_dump(sk, cache); + if (err < 0) + return err; + + NL_DBG(2, "Upading cache %p <%s>, request sent, waiting for dump...\n", + cache, nl_cache_name(cache)); + nl_cache_clear(cache); + + return nl_cache_pickup(sk, cache); +} + +/** @} */ +#ifdef disabled + +/** + * @name Utillities + * @{ + */ + +/** + * Mark all objects in a cache + * @arg cache Cache to mark all objects in + */ +void nl_cache_mark_all(struct nl_cache *cache) +{ + struct nl_object *obj; + + NL_DBG(2, "Marking all objects in cache %p <%s>...\n", + cache, nl_cache_name(cache)); + + nl_list_for_each_entry(obj, &cache->c_items, ce_list) + nl_object_mark(obj); +} + +/** @} */ + +/** + * @name Dumping + * @{ + */ +#ifdef disabled +/** + * Dump all elements of a cache. + * @arg cache cache to dump + * @arg params dumping parameters + * + * Dumps all elements of the \a cache to the file descriptor \a fd. + */ +void nl_cache_dump(struct nl_cache *cache, struct nl_dump_params *params) +{ + nl_cache_dump_filter(cache, params, NULL); +} + +/** + * Dump all elements of a cache (filtered). + * @arg cache cache to dump + * @arg params dumping parameters (optional) + * @arg filter filter object + * + * Dumps all elements of the \a cache to the file descriptor \a fd + * given they match the given filter \a filter. + */ +void nl_cache_dump_filter(struct nl_cache *cache, + struct nl_dump_params *params, + struct nl_object *filter) +{ + int type = params ? params->dp_type : NL_DUMP_DETAILS; + struct nl_object_ops *ops; + struct nl_object *obj; + + NL_DBG(2, "Dumping cache %p <%s> filter %p\n", + cache, nl_cache_name(cache), filter); + + if (type > NL_DUMP_MAX || type < 0) + BUG(); + + if (cache->c_ops == NULL) + BUG(); + + ops = cache->c_ops->co_obj_ops; + if (!ops->oo_dump[type]) + return; + + nl_list_for_each_entry(obj, &cache->c_items, ce_list) { + if (filter && !nl_object_match_filter(obj, filter)) + continue; + + NL_DBG(4, "Dumping object %p...\n", obj); + dump_from_ops(obj, params); + } +} +#endif + +/** @} */ + +/** + * @name Iterators + * @{ + */ + +/** + * Call a callback on each element of the cache. + * @arg cache cache to iterate on + * @arg cb callback function + * @arg arg argument passed to callback function + * + * Calls a callback function \a cb on each element of the \a cache. + * The argument \a arg is passed on the callback function. + */ +void nl_cache_foreach(struct nl_cache *cache, + void (*cb)(struct nl_object *, void *), void *arg) +{ + nl_cache_foreach_filter(cache, NULL, cb, arg); +} + +/** + * Call a callback on each element of the cache (filtered). + * @arg cache cache to iterate on + * @arg filter filter object + * @arg cb callback function + * @arg arg argument passed to callback function + * + * Calls a callback function \a cb on each element of the \a cache + * that matches the \a filter. The argument \a arg is passed on + * to the callback function. + */ +void nl_cache_foreach_filter(struct nl_cache *cache, struct nl_object *filter, + void (*cb)(struct nl_object *, void *), void *arg) +{ + struct nl_object *obj, *tmp; + struct nl_object_ops *ops; + + if (cache->c_ops == NULL) + BUG(); + + ops = cache->c_ops->co_obj_ops; + + nl_list_for_each_entry_safe(obj, tmp, &cache->c_items, ce_list) { + if (filter && !nl_object_match_filter(obj, filter)) + continue; + + cb(obj, arg); + } +} + +/** @} */ +#endif + +/** @} */ diff --git a/package/libnl-tiny/src/cache_mngt.c b/package/libnl-tiny/src/cache_mngt.c new file mode 100644 index 0000000..d57d836 --- /dev/null +++ b/package/libnl-tiny/src/cache_mngt.c @@ -0,0 +1,249 @@ +/* + * lib/cache_mngt.c Cache Management + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup core + * @defgroup cache_mngt Caching + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/cache.h> +#include <netlink/utils.h> + +static struct nl_cache_ops *cache_ops; + +/** + * @name Cache Operations Sets + * @{ + */ + +/** + * Lookup the set cache operations of a certain cache type + * @arg name name of the cache type + * + * @return The cache operations or NULL if no operations + * have been registered under the specified name. + */ +struct nl_cache_ops *nl_cache_ops_lookup(const char *name) +{ + struct nl_cache_ops *ops; + + for (ops = cache_ops; ops; ops = ops->co_next) + if (!strcmp(ops->co_name, name)) + return ops; + + return NULL; +} + +/** + * Associate a message type to a set of cache operations + * @arg protocol netlink protocol + * @arg msgtype netlink message type + * + * Associates the specified netlink message type with + * a registered set of cache operations. + * + * @return The cache operations or NULL if no association + * could be made. + */ +struct nl_cache_ops *nl_cache_ops_associate(int protocol, int msgtype) +{ + int i; + struct nl_cache_ops *ops; + + for (ops = cache_ops; ops; ops = ops->co_next) { + if (ops->co_protocol != protocol) + continue; + + for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++) + if (ops->co_msgtypes[i].mt_id == msgtype) + return ops; + } + + return NULL; +} + +/** + * Lookup message type cache association + * @arg ops cache operations + * @arg msgtype netlink message type + * + * Searches for a matching message type association ing the specified + * cache operations. + * + * @return A message type association or NULL. + */ +struct nl_msgtype *nl_msgtype_lookup(struct nl_cache_ops *ops, int msgtype) +{ + int i; + + for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++) + if (ops->co_msgtypes[i].mt_id == msgtype) + return &ops->co_msgtypes[i]; + + return NULL; +} + +static struct nl_cache_ops *cache_ops_lookup_for_obj(struct nl_object_ops *obj_ops) +{ + struct nl_cache_ops *ops; + + for (ops = cache_ops; ops; ops = ops->co_next) + if (ops->co_obj_ops == obj_ops) + return ops; + + return NULL; + +} + +/** + * Call a function for each registered cache operation + * @arg cb Callback function to be called + * @arg arg User specific argument. + */ +void nl_cache_ops_foreach(void (*cb)(struct nl_cache_ops *, void *), void *arg) +{ + struct nl_cache_ops *ops; + + for (ops = cache_ops; ops; ops = ops->co_next) + cb(ops, arg); +} + +/** + * Register a set of cache operations + * @arg ops cache operations + * + * Called by users of caches to announce the avaibility of + * a certain cache type. + * + * @return 0 on success or a negative error code. + */ +int nl_cache_mngt_register(struct nl_cache_ops *ops) +{ + if (!ops->co_name || !ops->co_obj_ops) + return -NLE_INVAL; + + if (nl_cache_ops_lookup(ops->co_name)) + return -NLE_EXIST; + + ops->co_next = cache_ops; + cache_ops = ops; + + NL_DBG(1, "Registered cache operations %s\n", ops->co_name); + + return 0; +} + +/** + * Unregister a set of cache operations + * @arg ops cache operations + * + * Called by users of caches to announce a set of + * cache operations is no longer available. The + * specified cache operations must have been registered + * previously using nl_cache_mngt_register() + * + * @return 0 on success or a negative error code + */ +int nl_cache_mngt_unregister(struct nl_cache_ops *ops) +{ + struct nl_cache_ops *t, **tp; + + for (tp = &cache_ops; (t=*tp) != NULL; tp = &t->co_next) + if (t == ops) + break; + + if (!t) + return -NLE_NOCACHE; + + NL_DBG(1, "Unregistered cache operations %s\n", ops->co_name); + + *tp = t->co_next; + return 0; +} + +/** @} */ + +/** + * @name Global Cache Provisioning/Requiring + * @{ + */ + +/** + * Provide a cache for global use + * @arg cache cache to provide + * + * Offers the specified cache to be used by other modules. + * Only one cache per type may be shared at a time, + * a previsouly provided caches will be overwritten. + */ +void nl_cache_mngt_provide(struct nl_cache *cache) +{ + struct nl_cache_ops *ops; + + ops = cache_ops_lookup_for_obj(cache->c_ops->co_obj_ops); + if (!ops) + BUG(); + else + ops->co_major_cache = cache; +} + +/** + * Unprovide a cache for global use + * @arg cache cache to unprovide + * + * Cancels the offer to use a cache globally. The + * cache will no longer be returned via lookups but + * may still be in use. + */ +void nl_cache_mngt_unprovide(struct nl_cache *cache) +{ + struct nl_cache_ops *ops; + + ops = cache_ops_lookup_for_obj(cache->c_ops->co_obj_ops); + if (!ops) + BUG(); + else if (ops->co_major_cache == cache) + ops->co_major_cache = NULL; +} + +/** + * Demand the use of a global cache + * @arg name name of the required object type + * + * Trys to find a cache of the specified type for global + * use. + * + * @return A cache provided by another subsystem of the + * specified type marked to be available. + */ +struct nl_cache *nl_cache_mngt_require(const char *name) +{ + struct nl_cache_ops *ops; + + ops = nl_cache_ops_lookup(name); + if (!ops || !ops->co_major_cache) { + fprintf(stderr, "Application BUG: Your application must " + "call nl_cache_mngt_provide() and\nprovide a valid " + "%s cache to be used for internal lookups.\nSee the " + " API documentation for more details.\n", name); + + return NULL; + } + + return ops->co_major_cache; +} + +/** @} */ + +/** @} */ diff --git a/package/libnl-tiny/src/error.c b/package/libnl-tiny/src/error.c new file mode 100644 index 0000000..71ae722 --- /dev/null +++ b/package/libnl-tiny/src/error.c @@ -0,0 +1,108 @@ +/* + * lib/error.c Error Handling + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2008 Thomas Graf <tgraf@suug.ch> + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> + +static const char *errmsg[NLE_MAX+1] = { +[NLE_SUCCESS] = "Success", +[NLE_FAILURE] = "Unspecific failure", +[NLE_INTR] = "Interrupted system call", +[NLE_BAD_SOCK] = "Bad socket", +[NLE_AGAIN] = "Try again", +[NLE_NOMEM] = "Out of memory", +[NLE_EXIST] = "Object exists", +[NLE_INVAL] = "Invalid input data or parameter", +[NLE_RANGE] = "Input data out of range", +[NLE_MSGSIZE] = "Message size not sufficient", +[NLE_OPNOTSUPP] = "Operation not supported", +[NLE_AF_NOSUPPORT] = "Address family not supported", +[NLE_OBJ_NOTFOUND] = "Object not found", +[NLE_NOATTR] = "Attribute not available", +[NLE_MISSING_ATTR] = "Missing attribute", +[NLE_AF_MISMATCH] = "Address family mismatch", +[NLE_SEQ_MISMATCH] = "Message sequence number mismatch", +[NLE_MSG_OVERFLOW] = "Kernel reported message overflow", +[NLE_MSG_TRUNC] = "Kernel reported truncated message", +[NLE_NOADDR] = "Invalid address for specified address family", +[NLE_SRCRT_NOSUPPORT] = "Source based routing not supported", +[NLE_MSG_TOOSHORT] = "Netlink message is too short", +[NLE_MSGTYPE_NOSUPPORT] = "Netlink message type is not supported", +[NLE_OBJ_MISMATCH] = "Object type does not match cache", +[NLE_NOCACHE] = "Unknown or invalid cache type", +[NLE_BUSY] = "Object busy", +[NLE_PROTO_MISMATCH] = "Protocol mismatch", +[NLE_NOACCESS] = "No Access", +[NLE_PERM] = "Operation not permitted", +}; + +/** + * Return error message for an error code + * @return error message + */ +const char *nl_geterror(int error) +{ + error = abs(error); + + if (error > NLE_MAX) + error = NLE_FAILURE; + + return errmsg[error]; +} + +/** + * Print a libnl error message + * @arg s error message prefix + * + * Prints the error message of the call that failed last. + * + * If s is not NULL and *s is not a null byte the argument + * string is printed, followed by a colon and a blank. Then + * the error message and a new-line. + */ +void nl_perror(int error, const char *s) +{ + if (s && *s) + fprintf(stderr, "%s: %s\n", s, nl_geterror(error)); + else + fprintf(stderr, "%s\n", nl_geterror(error)); +} + +int nl_syserr2nlerr(int error) +{ + error = abs(error); + + switch (error) { + case EBADF: return NLE_BAD_SOCK; + case EADDRINUSE: return NLE_EXIST; + case EEXIST: return NLE_EXIST; + case EADDRNOTAVAIL: return NLE_NOADDR; + case ENOENT: return NLE_OBJ_NOTFOUND; + case EINTR: return NLE_INTR; + case EAGAIN: return NLE_AGAIN; + case ENOTSOCK: return NLE_BAD_SOCK; + case ENOPROTOOPT: return NLE_INVAL; + case EFAULT: return NLE_INVAL; + case EACCES: return NLE_NOACCESS; + case EINVAL: return NLE_INVAL; + case ENOBUFS: return NLE_NOMEM; + case ENOMEM: return NLE_NOMEM; + case EAFNOSUPPORT: return NLE_AF_NOSUPPORT; + case EPROTONOSUPPORT: return NLE_PROTO_MISMATCH; + case EOPNOTSUPP: return NLE_OPNOTSUPP; + case EPERM: return NLE_PERM; + case EBUSY: return NLE_BUSY; + default: return NLE_FAILURE; + } +} + +/** @} */ + diff --git a/package/libnl-tiny/src/genl.c b/package/libnl-tiny/src/genl.c new file mode 100644 index 0000000..055be91 --- /dev/null +++ b/package/libnl-tiny/src/genl.c @@ -0,0 +1,268 @@ +/* + * lib/genl/genl.c Generic Netlink + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @defgroup genl Generic Netlink + * + * @par Message Format + * @code + * <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) ---> + * +----------------------------+- - -+- - - - - - - - - - -+- - -+ + * | Header | Pad | Payload | Pad | + * | struct nlmsghdr | | | | + * +----------------------------+- - -+- - - - - - - - - - -+- - -+ + * @endcode + * @code + * <-------- GENL_HDRLEN -------> <--- hdrlen --> + * <------- genlmsg_len(ghdr) ------> + * +------------------------+- - -+---------------+- - -+------------+ + * | Generic Netlink Header | Pad | Family Header | Pad | Attributes | + * | struct genlmsghdr | | | | | + * +------------------------+- - -+---------------+- - -+------------+ + * genlmsg_data(ghdr)--------------^ ^ + * genlmsg_attrdata(ghdr, hdrlen)------------------------- + * @endcode + * + * @par Example + * @code + * #include <netlink/netlink.h> + * #include <netlink/genl/genl.h> + * #include <netlink/genl/ctrl.h> + * + * struct nl_sock *sock; + * struct nl_msg *msg; + * int family; + * + * // Allocate a new netlink socket + * sock = nl_socket_alloc(); + * + * // Connect to generic netlink socket on kernel side + * genl_connect(sock); + * + * // Ask kernel to resolve family name to family id + * family = genl_ctrl_resolve(sock, "generic_netlink_family_name"); + * + * // Construct a generic netlink by allocating a new message, fill in + * // the header and append a simple integer attribute. + * msg = nlmsg_alloc(); + * genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, family, 0, NLM_F_ECHO, + * CMD_FOO_GET, FOO_VERSION); + * nla_put_u32(msg, ATTR_FOO, 123); + * + * // Send message over netlink socket + * nl_send_auto_complete(sock, msg); + * + * // Free message + * nlmsg_free(msg); + * + * // Prepare socket to receive the answer by specifying the callback + * // function to be called for valid messages. + * nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, parse_cb, NULL); + * + * // Wait for the answer and receive it + * nl_recvmsgs_default(sock); + * + * static int parse_cb(struct nl_msg *msg, void *arg) + * { + * struct nlmsghdr *nlh = nlmsg_hdr(msg); + * struct nlattr *attrs[ATTR_MAX+1]; + * + * // Validate message and parse attributes + * genlmsg_parse(nlh, 0, attrs, ATTR_MAX, policy); + * + * if (attrs[ATTR_FOO]) { + * uint32_t value = nla_get_u32(attrs[ATTR_FOO]); + * ... + * } + * + * return 0; + * } + * @endcode + * @{ + */ + +#include <netlink-generic.h> +#include <netlink/netlink.h> +#include <netlink/genl/genl.h> +#include <netlink/utils.h> + +/** + * @name Socket Creating + * @{ + */ + +int genl_connect(struct nl_sock *sk) +{ + return nl_connect(sk, NETLINK_GENERIC); +} + +/** @} */ + +/** + * @name Sending + * @{ + */ + +/** + * Send trivial generic netlink message + * @arg sk Netlink socket. + * @arg family Generic netlink family + * @arg cmd Command + * @arg version Version + * @arg flags Additional netlink message flags. + * + * Fills out a routing netlink request message and sends it out + * using nl_send_simple(). + * + * @return 0 on success or a negative error code. + */ +int genl_send_simple(struct nl_sock *sk, int family, int cmd, + int version, int flags) +{ + struct genlmsghdr hdr = { + .cmd = cmd, + .version = version, + }; + + return nl_send_simple(sk, family, flags, &hdr, sizeof(hdr)); +} + +/** @} */ + + +/** + * @name Message Parsing + * @{ + */ + +int genlmsg_valid_hdr(struct nlmsghdr *nlh, int hdrlen) +{ + struct genlmsghdr *ghdr; + + if (!nlmsg_valid_hdr(nlh, GENL_HDRLEN)) + return 0; + + ghdr = nlmsg_data(nlh); + if (genlmsg_len(ghdr) < NLMSG_ALIGN(hdrlen)) + return 0; + + return 1; +} + +int genlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, + struct nla_policy *policy) +{ + struct genlmsghdr *ghdr; + + if (!genlmsg_valid_hdr(nlh, hdrlen)) + return -NLE_MSG_TOOSHORT; + + ghdr = nlmsg_data(nlh); + return nla_validate(genlmsg_attrdata(ghdr, hdrlen), + genlmsg_attrlen(ghdr, hdrlen), maxtype, policy); +} + +int genlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], + int maxtype, struct nla_policy *policy) +{ + struct genlmsghdr *ghdr; + + if (!genlmsg_valid_hdr(nlh, hdrlen)) + return -NLE_MSG_TOOSHORT; + + ghdr = nlmsg_data(nlh); + return nla_parse(tb, maxtype, genlmsg_attrdata(ghdr, hdrlen), + genlmsg_attrlen(ghdr, hdrlen), policy); +} + +/** + * Get head of message payload + * @arg gnlh genetlink messsage header + */ +void *genlmsg_data(const struct genlmsghdr *gnlh) +{ + return ((unsigned char *) gnlh + GENL_HDRLEN); +} + +/** + * Get lenght of message payload + * @arg gnlh genetlink message header + */ +int genlmsg_len(const struct genlmsghdr *gnlh) +{ + struct nlmsghdr *nlh = (struct nlmsghdr *)((unsigned char *)gnlh - + NLMSG_HDRLEN); + return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN); +} + +/** + * Get head of attribute data + * @arg gnlh generic netlink message header + * @arg hdrlen length of family specific header + */ +struct nlattr *genlmsg_attrdata(const struct genlmsghdr *gnlh, int hdrlen) +{ + return genlmsg_data(gnlh) + NLMSG_ALIGN(hdrlen); +} + +/** + * Get length of attribute data + * @arg gnlh generic netlink message header + * @arg hdrlen length of family specific header + */ +int genlmsg_attrlen(const struct genlmsghdr *gnlh, int hdrlen) +{ + return genlmsg_len(gnlh) - NLMSG_ALIGN(hdrlen); +} + +/** @} */ + +/** + * @name Message Building + * @{ + */ + +/** + * Add generic netlink header to netlink message + * @arg msg netlink message + * @arg pid netlink process id or NL_AUTO_PID + * @arg seq sequence number of message or NL_AUTO_SEQ + * @arg family generic netlink family + * @arg hdrlen length of user specific header + * @arg flags message flags + * @arg cmd generic netlink command + * @arg version protocol version + * + * Returns pointer to user specific header. + */ +void *genlmsg_put(struct nl_msg *msg, uint32_t pid, uint32_t seq, int family, + int hdrlen, int flags, uint8_t cmd, uint8_t version) +{ + struct nlmsghdr *nlh; + struct genlmsghdr hdr = { + .cmd = cmd, + .version = version, + }; + + nlh = nlmsg_put(msg, pid, seq, family, GENL_HDRLEN + hdrlen, flags); + if (nlh == NULL) + return NULL; + + memcpy(nlmsg_data(nlh), &hdr, sizeof(hdr)); + NL_DBG(2, "msg %p: Added generic netlink header cmd=%d version=%d\n", + msg, cmd, version); + + return nlmsg_data(nlh) + GENL_HDRLEN; +} + +/** @} */ + +/** @} */ diff --git a/package/libnl-tiny/src/genl_ctrl.c b/package/libnl-tiny/src/genl_ctrl.c new file mode 100644 index 0000000..1301642 --- /dev/null +++ b/package/libnl-tiny/src/genl_ctrl.c @@ -0,0 +1,302 @@ +/* + * lib/genl/ctrl.c Generic Netlink Controller + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup genl_mngt + * @defgroup ctrl Controller + * @brief + * + * @{ + */ + +#include <netlink-generic.h> +#include <netlink/netlink.h> +#include <netlink/genl/genl.h> +#include <netlink/genl/family.h> +#include <netlink/genl/mngt.h> +#include <netlink/genl/ctrl.h> +#include <netlink/utils.h> + +/** @cond SKIP */ +#define CTRL_VERSION 0x0001 + +static struct nl_cache_ops genl_ctrl_ops; +/** @endcond */ + +static int ctrl_request_update(struct nl_cache *c, struct nl_sock *h) +{ + return genl_send_simple(h, GENL_ID_CTRL, CTRL_CMD_GETFAMILY, + CTRL_VERSION, NLM_F_DUMP); +} + +static struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = { + [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 }, + [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_STRING, + .maxlen = GENL_NAMSIZ }, + [CTRL_ATTR_VERSION] = { .type = NLA_U32 }, + [CTRL_ATTR_HDRSIZE] = { .type = NLA_U32 }, + [CTRL_ATTR_MAXATTR] = { .type = NLA_U32 }, + [CTRL_ATTR_OPS] = { .type = NLA_NESTED }, +}; + +static struct nla_policy family_op_policy[CTRL_ATTR_OP_MAX+1] = { + [CTRL_ATTR_OP_ID] = { .type = NLA_U32 }, + [CTRL_ATTR_OP_FLAGS] = { .type = NLA_U32 }, +}; + +static int ctrl_msg_parser(struct nl_cache_ops *ops, struct genl_cmd *cmd, + struct genl_info *info, void *arg) +{ + struct genl_family *family; + struct nl_parser_param *pp = arg; + int err; + + family = genl_family_alloc(); + if (family == NULL) { + err = -NLE_NOMEM; + goto errout; + } + + if (info->attrs[CTRL_ATTR_FAMILY_NAME] == NULL) { + err = -NLE_MISSING_ATTR; + goto errout; + } + + if (info->attrs[CTRL_ATTR_FAMILY_ID] == NULL) { + err = -NLE_MISSING_ATTR; + goto errout; + } + + family->ce_msgtype = info->nlh->nlmsg_type; + genl_family_set_id(family, + nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID])); + genl_family_set_name(family, + nla_get_string(info->attrs[CTRL_ATTR_FAMILY_NAME])); + + if (info->attrs[CTRL_ATTR_VERSION]) { + uint32_t version = nla_get_u32(info->attrs[CTRL_ATTR_VERSION]); + genl_family_set_version(family, version); + } + + if (info->attrs[CTRL_ATTR_HDRSIZE]) { + uint32_t hdrsize = nla_get_u32(info->attrs[CTRL_ATTR_HDRSIZE]); + genl_family_set_hdrsize(family, hdrsize); + } + + if (info->attrs[CTRL_ATTR_MAXATTR]) { + uint32_t maxattr = nla_get_u32(info->attrs[CTRL_ATTR_MAXATTR]); + genl_family_set_maxattr(family, maxattr); + } + + if (info->attrs[CTRL_ATTR_OPS]) { + struct nlattr *nla, *nla_ops; + int remaining; + + nla_ops = info->attrs[CTRL_ATTR_OPS]; + nla_for_each_nested(nla, nla_ops, remaining) { + struct nlattr *tb[CTRL_ATTR_OP_MAX+1]; + int flags = 0, id; + + err = nla_parse_nested(tb, CTRL_ATTR_OP_MAX, nla, + family_op_policy); + if (err < 0) + goto errout; + + if (tb[CTRL_ATTR_OP_ID] == NULL) { + err = -NLE_MISSING_ATTR; + goto errout; + } + + id = nla_get_u32(tb[CTRL_ATTR_OP_ID]); + + if (tb[CTRL_ATTR_OP_FLAGS]) + flags = nla_get_u32(tb[CTRL_ATTR_OP_FLAGS]); + + err = genl_family_add_op(family, id, flags); + if (err < 0) + goto errout; + + } + } + + err = pp->pp_cb((struct nl_object *) family, pp); +errout: + genl_family_put(family); + return err; +} + +/** + * @name Cache Management + * @{ + */ + +int genl_ctrl_alloc_cache(struct nl_sock *sock, struct nl_cache **result) +{ + return nl_cache_alloc_and_fill(&genl_ctrl_ops, sock, result); +} + +/** + * Look up generic netlink family by id in the provided cache. + * @arg cache Generic netlink family cache. + * @arg id Family identifier. + * + * Searches through the cache looking for a registered family + * matching the specified identifier. The caller will own a + * reference on the returned object which needs to be given + * back after usage using genl_family_put(). + * + * @return Generic netlink family object or NULL if no match was found. + */ +struct genl_family *genl_ctrl_search(struct nl_cache *cache, int id) +{ + struct genl_family *fam; + + if (cache->c_ops != &genl_ctrl_ops) + BUG(); + + nl_list_for_each_entry(fam, &cache->c_items, ce_list) { + if (fam->gf_id == id) { + nl_object_get((struct nl_object *) fam); + return fam; + } + } + + return NULL; +} + +/** + * @name Resolver + * @{ + */ + +/** + * Look up generic netlink family by family name in the provided cache. + * @arg cache Generic netlink family cache. + * @arg name Family name. + * + * Searches through the cache looking for a registered family + * matching the specified name. The caller will own a reference + * on the returned object which needs to be given back after + * usage using genl_family_put(). + * + * @return Generic netlink family object or NULL if no match was found. + */ +struct genl_family *genl_ctrl_search_by_name(struct nl_cache *cache, + const char *name) +{ + struct genl_family *fam; + + if (cache->c_ops != &genl_ctrl_ops) + BUG(); + + nl_list_for_each_entry(fam, &cache->c_items, ce_list) { + if (!strcmp(name, fam->gf_name)) { + nl_object_get((struct nl_object *) fam); + return fam; + } + } + + return NULL; +} + +/** @} */ + +/** + * Resolve generic netlink family name to its identifier + * @arg sk Netlink socket. + * @arg name Name of generic netlink family + * + * Resolves the generic netlink family name to its identifer and returns + * it. + * + * @return A positive identifier or a negative error code. + */ +int genl_ctrl_resolve(struct nl_sock *sk, const char *name) +{ + struct nl_cache *cache; + struct genl_family *family; + int err; + + if ((err = genl_ctrl_alloc_cache(sk, &cache)) < 0) + return err; + + family = genl_ctrl_search_by_name(cache, name); + if (family == NULL) { + err = -NLE_OBJ_NOTFOUND; + goto errout; + } + + err = genl_family_get_id(family); + genl_family_put(family); +errout: + nl_cache_free(cache); + + return err; +} + +/** @} */ + +static struct genl_cmd genl_cmds[] = { + { + .c_id = CTRL_CMD_NEWFAMILY, + .c_name = "NEWFAMILY" , + .c_maxattr = CTRL_ATTR_MAX, + .c_attr_policy = ctrl_policy, + .c_msg_parser = ctrl_msg_parser, + }, + { + .c_id = CTRL_CMD_DELFAMILY, + .c_name = "DELFAMILY" , + }, + { + .c_id = CTRL_CMD_GETFAMILY, + .c_name = "GETFAMILY" , + }, + { + .c_id = CTRL_CMD_NEWOPS, + .c_name = "NEWOPS" , + }, + { + .c_id = CTRL_CMD_DELOPS, + .c_name = "DELOPS" , + }, +}; + +static struct genl_ops genl_ops = { + .o_cmds = genl_cmds, + .o_ncmds = ARRAY_SIZE(genl_cmds), +}; + +/** @cond SKIP */ +extern struct nl_object_ops genl_family_ops; +/** @endcond */ + +static struct nl_cache_ops genl_ctrl_ops = { + .co_name = "genl/family", + .co_hdrsize = GENL_HDRSIZE(0), + .co_msgtypes = GENL_FAMILY(GENL_ID_CTRL, "nlctrl"), + .co_genl = &genl_ops, + .co_protocol = NETLINK_GENERIC, + .co_request_update = ctrl_request_update, + .co_obj_ops = &genl_family_ops, +}; + +static void __init ctrl_init(void) +{ + genl_register(&genl_ctrl_ops); +} + +static void __exit ctrl_exit(void) +{ + genl_unregister(&genl_ctrl_ops); +} + +/** @} */ diff --git a/package/libnl-tiny/src/genl_family.c b/package/libnl-tiny/src/genl_family.c new file mode 100644 index 0000000..88aaad9 --- /dev/null +++ b/package/libnl-tiny/src/genl_family.c @@ -0,0 +1,136 @@ +/* + * lib/genl/family.c Generic Netlink Family + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup genl + * @defgroup genl_family Generic Netlink Family + * @brief + * + * @{ + */ + +#include <netlink-generic.h> +#include <netlink/netlink.h> +#include <netlink/genl/genl.h> +#include <netlink/genl/family.h> +#include <netlink/utils.h> + +struct nl_object_ops genl_family_ops; +/** @endcond */ + +static void family_constructor(struct nl_object *c) +{ + struct genl_family *family = (struct genl_family *) c; + + nl_init_list_head(&family->gf_ops); +} + +static void family_free_data(struct nl_object *c) +{ + struct genl_family *family = (struct genl_family *) c; + struct genl_family_op *ops, *tmp; + + if (family == NULL) + return; + + nl_list_for_each_entry_safe(ops, tmp, &family->gf_ops, o_list) { + nl_list_del(&ops->o_list); + free(ops); + } +} + +static int family_clone(struct nl_object *_dst, struct nl_object *_src) +{ + struct genl_family *dst = nl_object_priv(_dst); + struct genl_family *src = nl_object_priv(_src); + struct genl_family_op *ops; + int err; + + nl_list_for_each_entry(ops, &src->gf_ops, o_list) { + err = genl_family_add_op(dst, ops->o_id, ops->o_flags); + if (err < 0) + return err; + } + + return 0; +} + +static int family_compare(struct nl_object *_a, struct nl_object *_b, + uint32_t attrs, int flags) +{ + struct genl_family *a = (struct genl_family *) _a; + struct genl_family *b = (struct genl_family *) _b; + int diff = 0; + +#define FAM_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, FAMILY_ATTR_##ATTR, a, b, EXPR) + + diff |= FAM_DIFF(ID, a->gf_id != b->gf_id); + diff |= FAM_DIFF(VERSION, a->gf_version != b->gf_version); + diff |= FAM_DIFF(HDRSIZE, a->gf_hdrsize != b->gf_hdrsize); + diff |= FAM_DIFF(MAXATTR, a->gf_maxattr != b->gf_maxattr); + diff |= FAM_DIFF(NAME, strcmp(a->gf_name, b->gf_name)); + +#undef FAM_DIFF + + return diff; +} + + +/** + * @name Family Object + * @{ + */ + +struct genl_family *genl_family_alloc(void) +{ + return (struct genl_family *) nl_object_alloc(&genl_family_ops); +} + +void genl_family_put(struct genl_family *family) +{ + nl_object_put((struct nl_object *) family); +} + +/** @} */ + + +int genl_family_add_op(struct genl_family *family, int id, int flags) +{ + struct genl_family_op *op; + + op = calloc(1, sizeof(*op)); + if (op == NULL) + return -NLE_NOMEM; + + op->o_id = id; + op->o_flags = flags; + + nl_list_add_tail(&op->o_list, &family->gf_ops); + family->ce_mask |= FAMILY_ATTR_OPS; + + return 0; +} + +/** @} */ + +/** @cond SKIP */ +struct nl_object_ops genl_family_ops = { + .oo_name = "genl/family", + .oo_size = sizeof(struct genl_family), + .oo_constructor = family_constructor, + .oo_free_data = family_free_data, + .oo_clone = family_clone, + .oo_compare = family_compare, + .oo_id_attrs = FAMILY_ATTR_ID, +}; +/** @endcond */ + +/** @} */ diff --git a/package/libnl-tiny/src/genl_mngt.c b/package/libnl-tiny/src/genl_mngt.c new file mode 100644 index 0000000..5df9a6e --- /dev/null +++ b/package/libnl-tiny/src/genl_mngt.c @@ -0,0 +1,273 @@ +/* + * lib/genl/mngt.c Generic Netlink Management + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup genl + * @defgroup genl_mngt Management + * + * @par 1) Registering a generic netlink module + * @code + * #include <netlink/genl/mngt.h> + * + * // First step is to define all the commands being used in + * // particular generic netlink family. The ID and name are + * // mandatory to be filled out. A callback function and + * // most the attribute policy that comes with it must be + * // defined for commands expected to be issued towards + * // userspace. + * static struct genl_cmd foo_cmds[] = { + * { + * .c_id = FOO_CMD_NEW, + * .c_name = "NEWFOO" , + * .c_maxattr = FOO_ATTR_MAX, + * .c_attr_policy = foo_policy, + * .c_msg_parser = foo_msg_parser, + * }, + * { + * .c_id = FOO_CMD_DEL, + * .c_name = "DELFOO" , + * }, + * }; + * + * // The list of commands must then be integrated into a + * // struct genl_ops serving as handle for this particular + * // family. + * static struct genl_ops my_genl_ops = { + * .o_cmds = foo_cmds, + * .o_ncmds = ARRAY_SIZE(foo_cmds), + * }; + * + * // Using the above struct genl_ops an arbitary number of + * // cache handles can be associated to it. + * // + * // The macro GENL_HDRSIZE() must be used to specify the + * // length of the header to automatically take headers on + * // generic layers into account. + * // + * // The macro GENL_FAMILY() is used to represent the generic + * // netlink family id. + * static struct nl_cache_ops genl_foo_ops = { + * .co_name = "genl/foo", + * .co_hdrsize = GENL_HDRSIZE(sizeof(struct my_hdr)), + * .co_msgtypes = GENL_FAMILY(GENL_ID_GENERATE, "foo"), + * .co_genl = &my_genl_ops, + * .co_protocol = NETLINK_GENERIC, + * .co_request_update = foo_request_update, + * .co_obj_ops = &genl_foo_ops, + * }; + * + * // Finally each cache handle for a generic netlink family + * // must be registered using genl_register(). + * static void __init foo_init(void) + * { + * genl_register(&genl_foo_ops); + * } + * + * // ... respectively unregsted again. + * static void __exit foo_exit(void) + * { + * genl_unregister(&genl_foo_ops); + * } + * @endcode + * @{ + */ + +#include <netlink-generic.h> +#include <netlink/netlink.h> +#include <netlink/genl/genl.h> +#include <netlink/genl/mngt.h> +#include <netlink/genl/family.h> +#include <netlink/genl/ctrl.h> +#include <netlink/utils.h> + +static NL_LIST_HEAD(genl_ops_list); + +static int genl_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who, + struct nlmsghdr *nlh, struct nl_parser_param *pp) +{ + int i, err; + struct genlmsghdr *ghdr; + struct genl_cmd *cmd; + + ghdr = nlmsg_data(nlh); + + if (ops->co_genl == NULL) + BUG(); + + for (i = 0; i < ops->co_genl->o_ncmds; i++) { + cmd = &ops->co_genl->o_cmds[i]; + if (cmd->c_id == ghdr->cmd) + goto found; + } + + err = -NLE_MSGTYPE_NOSUPPORT; + goto errout; + +found: + if (cmd->c_msg_parser == NULL) + err = -NLE_OPNOTSUPP; + else { + struct nlattr *tb[cmd->c_maxattr + 1]; + struct genl_info info = { + .who = who, + .nlh = nlh, + .genlhdr = ghdr, + .userhdr = genlmsg_data(ghdr), + .attrs = tb, + }; + + err = nlmsg_parse(nlh, ops->co_hdrsize, tb, cmd->c_maxattr, + cmd->c_attr_policy); + if (err < 0) + goto errout; + + err = cmd->c_msg_parser(ops, cmd, &info, pp); + } +errout: + return err; + +} + +char *genl_op2name(int family, int op, char *buf, size_t len) +{ + struct genl_ops *ops; + int i; + + nl_list_for_each_entry(ops, &genl_ops_list, o_list) { + if (ops->o_family == family) { + for (i = 0; i < ops->o_ncmds; i++) { + struct genl_cmd *cmd; + cmd = &ops->o_cmds[i]; + + if (cmd->c_id == op) { + strncpy(buf, cmd->c_name, len - 1); + return buf; + } + } + } + } + + strncpy(buf, "unknown", len - 1); + return NULL; +} + + +/** + * @name Register/Unregister + * @{ + */ + +/** + * Register generic netlink operations + * @arg ops cache operations + */ +int genl_register(struct nl_cache_ops *ops) +{ + int err; + + if (ops->co_protocol != NETLINK_GENERIC) { + err = -NLE_PROTO_MISMATCH; + goto errout; + } + + if (ops->co_hdrsize < GENL_HDRSIZE(0)) { + err = -NLE_INVAL; + goto errout; + } + + if (ops->co_genl == NULL) { + err = -NLE_INVAL; + goto errout; + } + + ops->co_genl->o_cache_ops = ops; + ops->co_genl->o_name = ops->co_msgtypes[0].mt_name; + ops->co_genl->o_family = ops->co_msgtypes[0].mt_id; + ops->co_msg_parser = genl_msg_parser; + + /* FIXME: check for dup */ + + nl_list_add_tail(&ops->co_genl->o_list, &genl_ops_list); + + err = nl_cache_mngt_register(ops); +errout: + return err; +} + +/** + * Unregister generic netlink operations + * @arg ops cache operations + */ +void genl_unregister(struct nl_cache_ops *ops) +{ + nl_cache_mngt_unregister(ops); + nl_list_del(&ops->co_genl->o_list); +} + +/** @} */ + +/** + * @name Resolving ID/Name + * @{ + */ +#ifdef disabled +static int __genl_ops_resolve(struct nl_cache *ctrl, struct genl_ops *ops) +{ + struct genl_family *family; + + family = genl_ctrl_search_by_name(ctrl, ops->o_name); + if (family != NULL) { + ops->o_id = genl_family_get_id(family); + genl_family_put(family); + + return 0; + } + + return -NLE_OBJ_NOTFOUND; +} + +int genl_ops_resolve(struct nl_sock *sk, struct genl_ops *ops) +{ + struct nl_cache *ctrl; + int err; + + if ((err = genl_ctrl_alloc_cache(sk, &ctrl)) < 0) + goto errout; + + err = __genl_ops_resolve(ctrl, ops); + + nl_cache_free(ctrl); +errout: + return err; +} + +int genl_mngt_resolve(struct nl_sock *sk) +{ + struct nl_cache *ctrl; + struct genl_ops *ops; + int err = 0; + + if ((err = genl_ctrl_alloc_cache(sk, &ctrl)) < 0) + goto errout; + + nl_list_for_each_entry(ops, &genl_ops_list, o_list) { + err = __genl_ops_resolve(ctrl, ops); + } + + nl_cache_free(ctrl); +errout: + return err; +} +#endif +/** @} */ + + +/** @} */ diff --git a/package/libnl-tiny/src/handlers.c b/package/libnl-tiny/src/handlers.c new file mode 100644 index 0000000..12ebda5 --- /dev/null +++ b/package/libnl-tiny/src/handlers.c @@ -0,0 +1,162 @@ +/* + * lib/handlers.c default netlink message handlers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup core + * @defgroup cb Callbacks/Customization + * + * @details + * @par 1) Setting up a callback set + * @code + * // Allocate a callback set and initialize it to the verbose default set + * struct nl_cb *cb = nl_cb_alloc(NL_CB_VERBOSE); + * + * // Modify the set to call my_func() for all valid messages + * nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, my_func, NULL); + * + * // Set the error message handler to the verbose default implementation + * // and direct it to print all errors to the given file descriptor. + * FILE *file = fopen(...); + * nl_cb_err(cb, NL_CB_VERBOSE, NULL, file); + * @endcode + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/msg.h> +#include <netlink/handlers.h> + +/** + * @name Callback Handle Management + * @{ + */ + +/** + * Allocate a new callback handle + * @arg kind callback kind to be used for initialization + * @return Newly allocated callback handle or NULL + */ +struct nl_cb *nl_cb_alloc(enum nl_cb_kind kind) +{ + int i; + struct nl_cb *cb; + + if (kind < 0 || kind > NL_CB_KIND_MAX) + return NULL; + + cb = calloc(1, sizeof(*cb)); + if (!cb) + return NULL; + + cb->cb_refcnt = 1; + + for (i = 0; i <= NL_CB_TYPE_MAX; i++) + nl_cb_set(cb, i, kind, NULL, NULL); + + nl_cb_err(cb, kind, NULL, NULL); + + return cb; +} + +/** + * Clone an existing callback handle + * @arg orig original callback handle + * @return Newly allocated callback handle being a duplicate of + * orig or NULL + */ +struct nl_cb *nl_cb_clone(struct nl_cb *orig) +{ + struct nl_cb *cb; + + cb = nl_cb_alloc(NL_CB_DEFAULT); + if (!cb) + return NULL; + + memcpy(cb, orig, sizeof(*orig)); + cb->cb_refcnt = 1; + + return cb; +} + +void nl_cb_put(struct nl_cb *cb) +{ + if (!cb) + return; + + cb->cb_refcnt--; + + if (cb->cb_refcnt < 0) + BUG(); + + if (cb->cb_refcnt <= 0) + free(cb); +} + +/** @} */ + +/** + * @name Callback Setup + * @{ + */ + +/** + * Set up a callback + * @arg cb callback set + * @arg type callback to modify + * @arg kind kind of implementation + * @arg func callback function (NL_CB_CUSTOM) + * @arg arg argument passed to callback + * + * @return 0 on success or a negative error code + */ +int nl_cb_set(struct nl_cb *cb, enum nl_cb_type type, enum nl_cb_kind kind, + nl_recvmsg_msg_cb_t func, void *arg) +{ + if (type < 0 || type > NL_CB_TYPE_MAX) + return -NLE_RANGE; + + if (kind < 0 || kind > NL_CB_KIND_MAX) + return -NLE_RANGE; + + if (kind == NL_CB_CUSTOM) { + cb->cb_set[type] = func; + cb->cb_args[type] = arg; + } + + return 0; +} + +/** + * Set up an error callback + * @arg cb callback set + * @arg kind kind of callback + * @arg func callback function + * @arg arg argument to be passed to callback function + */ +int nl_cb_err(struct nl_cb *cb, enum nl_cb_kind kind, + nl_recvmsg_err_cb_t func, void *arg) +{ + if (kind < 0 || kind > NL_CB_KIND_MAX) + return -NLE_RANGE; + + if (kind == NL_CB_CUSTOM) { + cb->cb_err = func; + cb->cb_err_arg = arg; + } + + return 0; +} + +/** @} */ + +/** @} */ diff --git a/package/libnl-tiny/src/include/linux/genetlink.h b/package/libnl-tiny/src/include/linux/genetlink.h new file mode 100644 index 0000000..f7a9377 --- /dev/null +++ b/package/libnl-tiny/src/include/linux/genetlink.h @@ -0,0 +1,69 @@ +#ifndef __LINUX_GENERIC_NETLINK_H +#define __LINUX_GENERIC_NETLINK_H + +#include <linux/netlink.h> + +#define GENL_NAMSIZ 16 /* length of family name */ + +#define GENL_MIN_ID NLMSG_MIN_TYPE +#define GENL_MAX_ID 1023 + +struct genlmsghdr { + __u8 cmd; + __u8 version; + __u16 reserved; +}; + +#define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr)) + +#define GENL_ADMIN_PERM 0x01 +#define GENL_CMD_CAP_DO 0x02 +#define GENL_CMD_CAP_DUMP 0x04 +#define GENL_CMD_CAP_HASPOL 0x08 + +/* + * List of reserved static generic netlink identifiers: + */ +#define GENL_ID_GENERATE 0 +#define GENL_ID_CTRL NLMSG_MIN_TYPE + +/************************************************************************** + * Controller + **************************************************************************/ + +enum { + CTRL_CMD_UNSPEC, + CTRL_CMD_NEWFAMILY, + CTRL_CMD_DELFAMILY, + CTRL_CMD_GETFAMILY, + CTRL_CMD_NEWOPS, + CTRL_CMD_DELOPS, + CTRL_CMD_GETOPS, + __CTRL_CMD_MAX, +}; + +#define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1) + +enum { + CTRL_ATTR_UNSPEC, + CTRL_ATTR_FAMILY_ID, + CTRL_ATTR_FAMILY_NAME, + CTRL_ATTR_VERSION, + CTRL_ATTR_HDRSIZE, + CTRL_ATTR_MAXATTR, + CTRL_ATTR_OPS, + __CTRL_ATTR_MAX, +}; + +#define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1) + +enum { + CTRL_ATTR_OP_UNSPEC, + CTRL_ATTR_OP_ID, + CTRL_ATTR_OP_FLAGS, + __CTRL_ATTR_OP_MAX, +}; + +#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1) + +#endif /* __LINUX_GENERIC_NETLINK_H */ diff --git a/package/libnl-tiny/src/include/linux/if.h b/package/libnl-tiny/src/include/linux/if.h new file mode 100644 index 0000000..4c1bcfe --- /dev/null +++ b/package/libnl-tiny/src/include/linux/if.h @@ -0,0 +1,131 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Global definitions for the INET interface module. + * + * Version: @(#)if.h 1.0.2 04/18/93 + * + * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1982-1988 + * Ross Biro + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _LINUX_IF_H +#define _LINUX_IF_H + +#include <linux/types.h> /* for "__kernel_caddr_t" et al */ + +#define IFNAMSIZ 16 + +/* Standard interface flags (netdevice->flags). */ +#define IFF_UP 0x1 /* interface is up */ +#define IFF_BROADCAST 0x2 /* broadcast address valid */ +#define IFF_DEBUG 0x4 /* turn on debugging */ +#define IFF_LOOPBACK 0x8 /* is a loopback net */ +#define IFF_POINTOPOINT 0x10 /* interface is has p-p link */ +#define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ +#define IFF_RUNNING 0x40 /* interface RFC2863 OPER_UP */ +#define IFF_NOARP 0x80 /* no ARP protocol */ +#define IFF_PROMISC 0x100 /* receive all packets */ +#define IFF_ALLMULTI 0x200 /* receive all multicast packets*/ + +#define IFF_MASTER 0x400 /* master of a load balancer */ +#define IFF_SLAVE 0x800 /* slave of a load balancer */ + +#define IFF_MULTICAST 0x1000 /* Supports multicast */ + +#define IFF_PORTSEL 0x2000 /* can set media type */ +#define IFF_AUTOMEDIA 0x4000 /* auto media select active */ +#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses*/ + +#define IFF_LOWER_UP 0x10000 /* driver signals L1 up */ +#define IFF_DORMANT 0x20000 /* driver signals dormant */ + +#define IFF_ECHO 0x40000 /* echo sent packets */ + +#define IFF_VOLATILE (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST|IFF_ECHO|\ + IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT) + +/* Private (from user) interface flags (netdevice->priv_flags). */ +#define IFF_802_1Q_VLAN 0x1 /* 802.1Q VLAN device. */ +#define IFF_EBRIDGE 0x2 /* Ethernet bridging device. */ +#define IFF_SLAVE_INACTIVE 0x4 /* bonding slave not the curr. active */ +#define IFF_MASTER_8023AD 0x8 /* bonding master, 802.3ad. */ +#define IFF_MASTER_ALB 0x10 /* bonding master, balance-alb. */ +#define IFF_BONDING 0x20 /* bonding master or slave */ +#define IFF_SLAVE_NEEDARP 0x40 /* need ARPs for validation */ +#define IFF_ISATAP 0x80 /* ISATAP interface (RFC4214) */ + +#define IF_GET_IFACE 0x0001 /* for querying only */ +#define IF_GET_PROTO 0x0002 + +/* For definitions see hdlc.h */ +#define IF_IFACE_V35 0x1000 /* V.35 serial interface */ +#define IF_IFACE_V24 0x1001 /* V.24 serial interface */ +#define IF_IFACE_X21 0x1002 /* X.21 serial interface */ +#define IF_IFACE_T1 0x1003 /* T1 telco serial interface */ +#define IF_IFACE_E1 0x1004 /* E1 telco serial interface */ +#define IF_IFACE_SYNC_SERIAL 0x1005 /* can't be set by software */ +#define IF_IFACE_X21D 0x1006 /* X.21 Dual Clocking (FarSite) */ + +/* For definitions see hdlc.h */ +#define IF_PROTO_HDLC 0x2000 /* raw HDLC protocol */ +#define IF_PROTO_PPP 0x2001 /* PPP protocol */ +#define IF_PROTO_CISCO 0x2002 /* Cisco HDLC protocol */ +#define IF_PROTO_FR 0x2003 /* Frame Relay protocol */ +#define IF_PROTO_FR_ADD_PVC 0x2004 /* Create FR PVC */ +#define IF_PROTO_FR_DEL_PVC 0x2005 /* Delete FR PVC */ +#define IF_PROTO_X25 0x2006 /* X.25 */ +#define IF_PROTO_HDLC_ETH 0x2007 /* raw HDLC, Ethernet emulation */ +#define IF_PROTO_FR_ADD_ETH_PVC 0x2008 /* Create FR Ethernet-bridged PVC */ +#define IF_PROTO_FR_DEL_ETH_PVC 0x2009 /* Delete FR Ethernet-bridged PVC */ +#define IF_PROTO_FR_PVC 0x200A /* for reading PVC status */ +#define IF_PROTO_FR_ETH_PVC 0x200B +#define IF_PROTO_RAW 0x200C /* RAW Socket */ + +/* RFC 2863 operational status */ +enum { + IF_OPER_UNKNOWN, + IF_OPER_NOTPRESENT, + IF_OPER_DOWN, + IF_OPER_LOWERLAYERDOWN, + IF_OPER_TESTING, + IF_OPER_DORMANT, + IF_OPER_UP, +}; + +/* link modes */ +enum { + IF_LINK_MODE_DEFAULT, + IF_LINK_MODE_DORMANT, /* limit upward transition to dormant */ +}; + +/* + * Device mapping structure. I'd just gone off and designed a + * beautiful scheme using only loadable modules with arguments + * for driver options and along come the PCMCIA people 8) + * + * Ah well. The get() side of this is good for WDSETUP, and it'll + * be handy for debugging things. The set side is fine for now and + * being very small might be worth keeping for clean configuration. + */ + +struct ifmap +{ + unsigned long mem_start; + unsigned long mem_end; + unsigned short base_addr; + unsigned char irq; + unsigned char dma; + unsigned char port; + /* 3 bytes spare */ +}; + + +#endif /* _LINUX_IF_H */ diff --git a/package/libnl-tiny/src/include/linux/if_addr.h b/package/libnl-tiny/src/include/linux/if_addr.h new file mode 100644 index 0000000..43f3bed --- /dev/null +++ b/package/libnl-tiny/src/include/linux/if_addr.h @@ -0,0 +1,62 @@ +#ifndef __LINUX_IF_ADDR_H +#define __LINUX_IF_ADDR_H + +#include <linux/netlink.h> + +struct ifaddrmsg +{ + __u8 ifa_family; + __u8 ifa_prefixlen; /* The prefix length */ + __u8 ifa_flags; /* Flags */ + __u8 ifa_scope; /* Address scope */ + __u32 ifa_index; /* Link index */ +}; + +/* + * Important comment: + * IFA_ADDRESS is prefix address, rather than local interface address. + * It makes no difference for normally configured broadcast interfaces, + * but for point-to-point IFA_ADDRESS is DESTINATION address, + * local address is supplied in IFA_LOCAL attribute. + */ +enum +{ + IFA_UNSPEC, + IFA_ADDRESS, + IFA_LOCAL, + IFA_LABEL, + IFA_BROADCAST, + IFA_ANYCAST, + IFA_CACHEINFO, + IFA_MULTICAST, + __IFA_MAX, +}; + +#define IFA_MAX (__IFA_MAX - 1) + +/* ifa_flags */ +#define IFA_F_SECONDARY 0x01 +#define IFA_F_TEMPORARY IFA_F_SECONDARY + +#define IFA_F_NODAD 0x02 +#define IFA_F_OPTIMISTIC 0x04 +#define IFA_F_HOMEADDRESS 0x10 +#define IFA_F_DEPRECATED 0x20 +#define IFA_F_TENTATIVE 0x40 +#define IFA_F_PERMANENT 0x80 + +struct ifa_cacheinfo +{ + __u32 ifa_prefered; + __u32 ifa_valid; + __u32 cstamp; /* created timestamp, hundredths of seconds */ + __u32 tstamp; /* updated timestamp, hundredths of seconds */ +}; + +/* backwards compatibility for userspace */ +#ifndef __KERNEL__ +#define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg)))) +#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg)) +#endif + +#endif diff --git a/package/libnl-tiny/src/include/linux/netlink.h b/package/libnl-tiny/src/include/linux/netlink.h new file mode 100644 index 0000000..d252103 --- /dev/null +++ b/package/libnl-tiny/src/include/linux/netlink.h @@ -0,0 +1,150 @@ +#ifndef __LINUX_NETLINK_H +#define __LINUX_NETLINK_H + +#include <linux/socket.h> /* for sa_family_t */ +#include <linux/types.h> + +#define NETLINK_ROUTE 0 /* Routing/device hook */ +#define NETLINK_UNUSED 1 /* Unused number */ +#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ +#define NETLINK_FIREWALL 3 /* Firewalling hook */ +#define NETLINK_INET_DIAG 4 /* INET socket monitoring */ +#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ +#define NETLINK_XFRM 6 /* ipsec */ +#define NETLINK_SELINUX 7 /* SELinux event notifications */ +#define NETLINK_ISCSI 8 /* Open-iSCSI */ +#define NETLINK_AUDIT 9 /* auditing */ +#define NETLINK_FIB_LOOKUP 10 +#define NETLINK_CONNECTOR 11 +#define NETLINK_NETFILTER 12 /* netfilter subsystem */ +#define NETLINK_IP6_FW 13 +#define NETLINK_DNRTMSG 14 /* DECnet routing messages */ +#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ +#define NETLINK_GENERIC 16 +/* leave room for NETLINK_DM (DM Events) */ +#define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ +#define NETLINK_ECRYPTFS 19 + +#define MAX_LINKS 32 + +struct sockaddr_nl +{ + sa_family_t nl_family; /* AF_NETLINK */ + unsigned short nl_pad; /* zero */ + __u32 nl_pid; /* port ID */ + __u32 nl_groups; /* multicast groups mask */ +}; + +struct nlmsghdr +{ + __u32 nlmsg_len; /* Length of message including header */ + __u16 nlmsg_type; /* Message content */ + __u16 nlmsg_flags; /* Additional flags */ + __u32 nlmsg_seq; /* Sequence number */ + __u32 nlmsg_pid; /* Sending process port ID */ +}; + +/* Flags values */ + +#define NLM_F_REQUEST 1 /* It is request message. */ +#define NLM_F_MULTI 2 /* Multipart message, terminated by NLMSG_DONE */ +#define NLM_F_ACK 4 /* Reply with ack, with zero or error code */ +#define NLM_F_ECHO 8 /* Echo this request */ + +/* Modifiers to GET request */ +#define NLM_F_ROOT 0x100 /* specify tree root */ +#define NLM_F_MATCH 0x200 /* return all matching */ +#define NLM_F_ATOMIC 0x400 /* atomic GET */ +#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) + +/* Modifiers to NEW request */ +#define NLM_F_REPLACE 0x100 /* Override existing */ +#define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ +#define NLM_F_CREATE 0x400 /* Create, if it does not exist */ +#define NLM_F_APPEND 0x800 /* Add to end of list */ + +/* + 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL + 4.4BSD CHANGE NLM_F_REPLACE + + True CHANGE NLM_F_CREATE|NLM_F_REPLACE + Append NLM_F_CREATE + Check NLM_F_EXCL + */ + +#define NLMSG_ALIGNTO 4 +#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) +#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) +#define NLMSG_LENGTH(len) ((len)+NLMSG_ALIGN(NLMSG_HDRLEN)) +#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) +#define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) +#define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ + (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) +#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ + (nlh)->nlmsg_len <= (len)) +#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) + +#define NLMSG_NOOP 0x1 /* Nothing. */ +#define NLMSG_ERROR 0x2 /* Error */ +#define NLMSG_DONE 0x3 /* End of a dump */ +#define NLMSG_OVERRUN 0x4 /* Data lost */ + +#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ + +struct nlmsgerr +{ + int error; + struct nlmsghdr msg; +}; + +#define NETLINK_ADD_MEMBERSHIP 1 +#define NETLINK_DROP_MEMBERSHIP 2 +#define NETLINK_PKTINFO 3 + +struct nl_pktinfo +{ + __u32 group; +}; + +#define NET_MAJOR 36 /* Major 36 is reserved for networking */ + +enum { + NETLINK_UNCONNECTED = 0, + NETLINK_CONNECTED, +}; + +/* + * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> + * +---------------------+- - -+- - - - - - - - - -+- - -+ + * | Header | Pad | Payload | Pad | + * | (struct nlattr) | ing | | ing | + * +---------------------+- - -+- - - - - - - - - -+- - -+ + * <-------------- nlattr->nla_len --------------> + */ + +struct nlattr +{ + __u16 nla_len; + __u16 nla_type; +}; + +/* + * nla_type (16 bits) + * +---+---+-------------------------------+ + * | N | O | Attribute Type | + * +---+---+-------------------------------+ + * N := Carries nested attributes + * O := Payload stored in network byte order + * + * Note: The N and O flag are mutually exclusive. + */ +#define NLA_F_NESTED (1 << 15) +#define NLA_F_NET_BYTEORDER (1 << 14) +#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) + +#define NLA_ALIGNTO 4 +#define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) +#define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) + +#endif /* __LINUX_NETLINK_H */ diff --git a/package/libnl-tiny/src/include/netlink-generic.h b/package/libnl-tiny/src/include/netlink-generic.h new file mode 100644 index 0000000..10aa2f0 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink-generic.h @@ -0,0 +1,20 @@ +/* + * netlink-generic.h Local Generic Netlink Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_GENL_PRIV_H_ +#define NETLINK_GENL_PRIV_H_ + +#include <netlink-local.h> +#include <netlink/netlink.h> + +#define GENL_HDRSIZE(hdrlen) (GENL_HDRLEN + (hdrlen)) + +#endif diff --git a/package/libnl-tiny/src/include/netlink-local.h b/package/libnl-tiny/src/include/netlink-local.h new file mode 100644 index 0000000..a311ec0 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink-local.h @@ -0,0 +1,153 @@ +/* + * netlink-local.h Local Netlink Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_LOCAL_H_ +#define NETLINK_LOCAL_H_ + +#include <stdio.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <math.h> +#include <time.h> +#include <stdarg.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <inttypes.h> +#include <assert.h> +#include <limits.h> + +#include <arpa/inet.h> +#include <netdb.h> + +#ifndef SOL_NETLINK +#define SOL_NETLINK 270 +#endif + +#include <linux/types.h> + +/* local header copies */ +#include <linux/if.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/pkt_sched.h> +#include <linux/pkt_cls.h> +#include <linux/gen_stats.h> + +#include <netlink/netlink.h> +#include <netlink/handlers.h> +#include <netlink/cache.h> +#include <netlink/object-api.h> +#include <netlink/cache-api.h> +#include <netlink-types.h> + +struct trans_tbl { + int i; + const char *a; +}; + +#define __ADD(id, name) { .i = id, .a = #name }, + +struct trans_list { + int i; + char *a; + struct nl_list_head list; +}; + +#define NL_DEBUG 1 + +#define NL_DBG(LVL,FMT,ARG...) \ + do {} while (0) + +#define BUG() \ + do { \ + fprintf(stderr, "BUG: %s:%d\n", \ + __FILE__, __LINE__); \ + assert(0); \ + } while (0) + +extern int __nl_read_num_str_file(const char *path, + int (*cb)(long, const char *)); + +extern int __trans_list_add(int, const char *, struct nl_list_head *); +extern void __trans_list_clear(struct nl_list_head *); + +extern char *__type2str(int, char *, size_t, struct trans_tbl *, size_t); +extern int __str2type(const char *, struct trans_tbl *, size_t); + +extern char *__list_type2str(int, char *, size_t, struct nl_list_head *); +extern int __list_str2type(const char *, struct nl_list_head *); + +extern char *__flags2str(int, char *, size_t, struct trans_tbl *, size_t); +extern int __str2flags(const char *, struct trans_tbl *, size_t); + +extern void dump_from_ops(struct nl_object *, struct nl_dump_params *); + +static inline struct nl_cache *dp_cache(struct nl_object *obj) +{ + if (obj->ce_cache == NULL) + return nl_cache_mngt_require(obj->ce_ops->oo_name); + + return obj->ce_cache; +} + +static inline int nl_cb_call(struct nl_cb *cb, int type, struct nl_msg *msg) +{ + return cb->cb_set[type](msg, cb->cb_args[type]); +} + +#define ARRAY_SIZE(X) (sizeof(X) / sizeof((X)[0])) +#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) + +#define __init __attribute__ ((constructor)) +#define __exit __attribute__ ((destructor)) +#undef __deprecated +#define __deprecated __attribute__ ((deprecated)) + +#define min(x,y) ({ \ + typeof(x) _x = (x); \ + typeof(y) _y = (y); \ + (void) (&_x == &_y); \ + _x < _y ? _x : _y; }) + +#define max(x,y) ({ \ + typeof(x) _x = (x); \ + typeof(y) _y = (y); \ + (void) (&_x == &_y); \ + _x > _y ? _x : _y; }) + +extern int nl_cache_parse(struct nl_cache_ops *, struct sockaddr_nl *, + struct nlmsghdr *, struct nl_parser_param *); + + +static inline char *nl_cache_name(struct nl_cache *cache) +{ + return cache->c_ops ? cache->c_ops->co_name : "unknown"; +} + +#define GENL_FAMILY(id, name) \ + { \ + { id, NL_ACT_UNSPEC, name }, \ + END_OF_MSGTYPES_LIST, \ + } + +static inline int wait_for_ack(struct nl_sock *sk) +{ + if (sk->s_flags & NL_NO_AUTO_ACK) + return 0; + else + return nl_wait_for_ack(sk); +} + +#endif diff --git a/package/libnl-tiny/src/include/netlink-types.h b/package/libnl-tiny/src/include/netlink-types.h new file mode 100644 index 0000000..0d00593 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink-types.h @@ -0,0 +1,81 @@ +/* + * netlink-types.h Netlink Types (Private) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_LOCAL_TYPES_H_ +#define NETLINK_LOCAL_TYPES_H_ + +#include <netlink/list.h> + +struct nl_cache_ops; +struct nl_sock; +struct nl_object; + +struct nl_cache +{ + struct nl_list_head c_items; + int c_nitems; + int c_iarg1; + int c_iarg2; + struct nl_cache_ops * c_ops; +}; + +struct nl_cache_assoc +{ + struct nl_cache * ca_cache; + change_func_t ca_change; +}; + +struct nl_cache_mngr +{ + int cm_protocol; + int cm_flags; + int cm_nassocs; + struct nl_sock * cm_handle; + struct nl_cache_assoc * cm_assocs; +}; + +struct nl_parser_param; + +#define LOOSE_COMPARISON 1 + + +struct nl_data +{ + size_t d_size; + void * d_data; +}; + +struct nl_addr +{ + int a_family; + unsigned int a_maxsize; + unsigned int a_len; + int a_prefixlen; + int a_refcnt; + char a_addr[0]; +}; + +#define IFQDISCSIZ 32 + +#define GENL_OP_HAS_POLICY 1 +#define GENL_OP_HAS_DOIT 2 +#define GENL_OP_HAS_DUMPIT 4 + +struct genl_family_op +{ + uint32_t o_id; + uint32_t o_flags; + + struct nl_list_head o_list; +}; + + +#endif diff --git a/package/libnl-tiny/src/include/netlink/addr.h b/package/libnl-tiny/src/include/netlink/addr.h new file mode 100644 index 0000000..cc3d201 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/addr.h @@ -0,0 +1,69 @@ +/* + * netlink/addr.h Abstract Address + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_ADDR_H_ +#define NETLINK_ADDR_H_ + +#include <netlink/netlink.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_addr; + +/* Creation */ +extern struct nl_addr * nl_addr_alloc(size_t); +extern struct nl_addr * nl_addr_alloc_attr(struct nlattr *, int); +extern struct nl_addr * nl_addr_build(int, void *, size_t); +extern int nl_addr_parse(const char *, int, struct nl_addr **); +extern struct nl_addr * nl_addr_clone(struct nl_addr *); + +/* Destroyage */ +extern void nl_addr_destroy(struct nl_addr *); + +/* Usage Management */ +extern struct nl_addr * nl_addr_get(struct nl_addr *); +extern void nl_addr_put(struct nl_addr *); +extern int nl_addr_shared(struct nl_addr *); + +extern int nl_addr_cmp(struct nl_addr *, struct nl_addr *); +extern int nl_addr_cmp_prefix(struct nl_addr *, struct nl_addr *); +extern int nl_addr_iszero(struct nl_addr *); +extern int nl_addr_valid(char *, int); +extern int nl_addr_guess_family(struct nl_addr *); +extern int nl_addr_fill_sockaddr(struct nl_addr *, + struct sockaddr *, socklen_t *); +extern int nl_addr_info(struct nl_addr *, struct addrinfo **); +extern int nl_addr_resolve(struct nl_addr *addr, char *host, size_t hostlen); + +/* Access Functions */ +extern void nl_addr_set_family(struct nl_addr *, int); +extern int nl_addr_get_family(struct nl_addr *); +extern int nl_addr_set_binary_addr(struct nl_addr *, void *, + size_t); +extern void * nl_addr_get_binary_addr(struct nl_addr *); +extern unsigned int nl_addr_get_len(struct nl_addr *); +extern void nl_addr_set_prefixlen(struct nl_addr *, int); +extern unsigned int nl_addr_get_prefixlen(struct nl_addr *); + +/* Address Family Translations */ +extern char * nl_af2str(int, char *, size_t); +extern int nl_str2af(const char *); + +/* Translations to Strings */ +extern char * nl_addr2str(struct nl_addr *, char *, size_t); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/attr.h b/package/libnl-tiny/src/include/netlink/attr.h new file mode 100644 index 0000000..7076d67 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/attr.h @@ -0,0 +1,726 @@ +/* + * netlink/attr.h Netlink Attributes + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_ATTR_H_ +#define NETLINK_ATTR_H_ + +#include <netlink/netlink.h> +#include <netlink/object.h> +#include <netlink/addr.h> +#include <netlink/data.h> +#include <netlink/msg.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_msg; + +/** + * @name Basic Attribute Data Types + * @{ + */ + + /** + * @ingroup attr + * Basic attribute data types + * + * See \ref attr_datatypes for more details. + */ +enum { + NLA_UNSPEC, /**< Unspecified type, binary data chunk */ + NLA_U8, /**< 8 bit integer */ + NLA_U16, /**< 16 bit integer */ + NLA_U32, /**< 32 bit integer */ + NLA_U64, /**< 64 bit integer */ + NLA_STRING, /**< NUL terminated character string */ + NLA_FLAG, /**< Flag */ + NLA_MSECS, /**< Micro seconds (64bit) */ + NLA_NESTED, /**< Nested attributes */ + __NLA_TYPE_MAX, +}; + +#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) + +/** @} */ + +/** + * @ingroup attr + * Attribute validation policy. + * + * See \ref attr_datatypes for more details. + */ +struct nla_policy { + /** Type of attribute or NLA_UNSPEC */ + uint16_t type; + + /** Minimal length of payload required */ + uint16_t minlen; + + /** Maximal length of payload allowed */ + uint16_t maxlen; +}; + +/* Attribute parsing */ +extern int nla_ok(const struct nlattr *, int); +extern struct nlattr * nla_next(const struct nlattr *, int *); +extern int nla_parse(struct nlattr **, int, struct nlattr *, + int, struct nla_policy *); +extern int nla_validate(struct nlattr *, int, int, + struct nla_policy *); +extern struct nlattr * nla_find(struct nlattr *, int, int); + +/* Unspecific attribute */ +extern struct nlattr * nla_reserve(struct nl_msg *, int, int); +extern int nla_put(struct nl_msg *, int, int, const void *); + +/** + * nlmsg_find_attr - find a specific attribute in a netlink message + * @arg nlh netlink message header + * @arg hdrlen length of familiy specific header + * @arg attrtype type of attribute to look for + * + * Returns the first attribute which matches the specified type. + */ +static inline struct nlattr *nlmsg_find_attr(struct nlmsghdr *nlh, int hdrlen, int attrtype) +{ + return nla_find(nlmsg_attrdata(nlh, hdrlen), + nlmsg_attrlen(nlh, hdrlen), attrtype); +} + + +/** + * Return size of attribute whithout padding. + * @arg payload Payload length of attribute. + * + * @code + * <-------- nla_attr_size(payload) ---------> + * +------------------+- - -+- - - - - - - - - +- - -+ + * | Attribute Header | Pad | Payload | Pad | + * +------------------+- - -+- - - - - - - - - +- - -+ + * @endcode + * + * @return Size of attribute in bytes without padding. + */ +static inline int nla_attr_size(int payload) +{ + return NLA_HDRLEN + payload; +} + +/** + * Return size of attribute including padding. + * @arg payload Payload length of attribute. + * + * @code + * <----------- nla_total_size(payload) -----------> + * +------------------+- - -+- - - - - - - - - +- - -+ + * | Attribute Header | Pad | Payload | Pad | + * +------------------+- - -+- - - - - - - - - +- - -+ + * @endcode + * + * @return Size of attribute in bytes. + */ +static inline int nla_total_size(int payload) +{ + return NLA_ALIGN(nla_attr_size(payload)); +} + +/** + * Return length of padding at the tail of the attribute. + * @arg payload Payload length of attribute. + * + * @code + * +------------------+- - -+- - - - - - - - - +- - -+ + * | Attribute Header | Pad | Payload | Pad | + * +------------------+- - -+- - - - - - - - - +- - -+ + * <---> + * @endcode + * + * @return Length of padding in bytes. + */ +static inline int nla_padlen(int payload) +{ + return nla_total_size(payload) - nla_attr_size(payload); +} + +/** + * Return type of the attribute. + * @arg nla Attribute. + * + * @return Type of attribute. + */ +static inline int nla_type(const struct nlattr *nla) +{ + return nla->nla_type & NLA_TYPE_MASK; +} + +/** + * Return pointer to the payload section. + * @arg nla Attribute. + * + * @return Pointer to start of payload section. + */ +static inline void *nla_data(const struct nlattr *nla) +{ + return (char *) nla + NLA_HDRLEN; +} + +/** + * Return length of the payload . + * @arg nla Attribute + * + * @return Length of payload in bytes. + */ +static inline int nla_len(const struct nlattr *nla) +{ + return nla->nla_len - NLA_HDRLEN; +} + +/** + * Copy attribute payload to another memory area. + * @arg dest Pointer to destination memory area. + * @arg src Attribute + * @arg count Number of bytes to copy at most. + * + * Note: The number of bytes copied is limited by the length of + * the attribute payload. + * + * @return The number of bytes copied to dest. + */ +static inline int nla_memcpy(void *dest, struct nlattr *src, int count) +{ + int minlen; + + if (!src) + return 0; + + minlen = min_t(int, count, nla_len(src)); + memcpy(dest, nla_data(src), minlen); + + return minlen; +} + + +/** + * Add abstract data as unspecific attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg data Abstract data object. + * + * Equivalent to nla_put() except that the length of the payload is + * derived from the abstract data object. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_data(struct nl_msg *msg, int attrtype, struct nl_data *data) +{ + return nla_put(msg, attrtype, nl_data_get_size(data), + nl_data_get(data)); +} + +/** + * Add abstract address as unspecific attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg addr Abstract address object. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_addr(struct nl_msg *msg, int attrtype, struct nl_addr *addr) +{ + return nla_put(msg, attrtype, nl_addr_get_len(addr), + nl_addr_get_binary_addr(addr)); +} + +/** @} */ + +/** + * @name Integer Attributes + */ + +/** + * Add 8 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value to store as payload. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_u8(struct nl_msg *msg, int attrtype, uint8_t value) +{ + return nla_put(msg, attrtype, sizeof(uint8_t), &value); +} + +/** + * Return value of 8 bit integer attribute. + * @arg nla 8 bit integer attribute + * + * @return Payload as 8 bit integer. + */ +static inline uint8_t nla_get_u8(struct nlattr *nla) +{ + return *(uint8_t *) nla_data(nla); +} + +/** + * Add 16 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value to store as payload. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_u16(struct nl_msg *msg, int attrtype, uint16_t value) +{ + return nla_put(msg, attrtype, sizeof(uint16_t), &value); +} + +/** + * Return payload of 16 bit integer attribute. + * @arg nla 16 bit integer attribute + * + * @return Payload as 16 bit integer. + */ +static inline uint16_t nla_get_u16(struct nlattr *nla) +{ + return *(uint16_t *) nla_data(nla); +} + +/** + * Add 32 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value to store as payload. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_u32(struct nl_msg *msg, int attrtype, uint32_t value) +{ + return nla_put(msg, attrtype, sizeof(uint32_t), &value); +} + +/** + * Return payload of 32 bit integer attribute. + * @arg nla 32 bit integer attribute. + * + * @return Payload as 32 bit integer. + */ +static inline uint32_t nla_get_u32(struct nlattr *nla) +{ + return *(uint32_t *) nla_data(nla); +} + +/** + * Add 64 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value to store as payload. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_u64(struct nl_msg *msg, int attrtype, uint64_t value) +{ + return nla_put(msg, attrtype, sizeof(uint64_t), &value); +} + +/** + * Return payload of u64 attribute + * @arg nla u64 netlink attribute + * + * @return Payload as 64 bit integer. + */ +static inline uint64_t nla_get_u64(struct nlattr *nla) +{ + uint64_t tmp; + + nla_memcpy(&tmp, nla, sizeof(tmp)); + + return tmp; +} + +/** + * Add string attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg str NUL terminated string. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_string(struct nl_msg *msg, int attrtype, const char *str) +{ + return nla_put(msg, attrtype, strlen(str) + 1, str); +} + +/** + * Return payload of string attribute. + * @arg nla String attribute. + * + * @return Pointer to attribute payload. + */ +static inline char *nla_get_string(struct nlattr *nla) +{ + return (char *) nla_data(nla); +} + +static inline char *nla_strdup(struct nlattr *nla) +{ + return strdup(nla_get_string(nla)); +} + +/** @} */ + +/** + * @name Flag Attribute + */ + +/** + * Add flag netlink attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_flag(struct nl_msg *msg, int attrtype) +{ + return nla_put(msg, attrtype, 0, NULL); +} + +/** + * Return true if flag attribute is set. + * @arg nla Flag netlink attribute. + * + * @return True if flag is set, otherwise false. + */ +static inline int nla_get_flag(struct nlattr *nla) +{ + return !!nla; +} + +/** @} */ + +/** + * @name Microseconds Attribute + */ + +/** + * Add a msecs netlink attribute to a netlink message + * @arg n netlink message + * @arg attrtype attribute type + * @arg msecs number of msecs + */ +static inline int nla_put_msecs(struct nl_msg *n, int attrtype, unsigned long msecs) +{ + return nla_put_u64(n, attrtype, msecs); +} + +/** + * Return payload of msecs attribute + * @arg nla msecs netlink attribute + * + * @return the number of milliseconds. + */ +static inline unsigned long nla_get_msecs(struct nlattr *nla) +{ + return nla_get_u64(nla); +} + +/** + * Add nested attributes to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg nested Message containing attributes to be nested. + * + * Takes the attributes found in the \a nested message and appends them + * to the message \a msg nested in a container of the type \a attrtype. + * The \a nested message may not have a family specific header. + * + * @see nla_put + * @return 0 on success or a negative error code. + */ +static inline int nla_put_nested(struct nl_msg *msg, int attrtype, struct nl_msg *nested) +{ + return nla_put(msg, attrtype, nlmsg_len(nested->nm_nlh), + nlmsg_data(nested->nm_nlh)); +} + +/** + * Start a new level of nested attributes. + * @arg msg Netlink message. + * @arg attrtype Attribute type of container. + * + * @return Pointer to container attribute. + */ +static inline struct nlattr *nla_nest_start(struct nl_msg *msg, int attrtype) +{ + struct nlattr *start = (struct nlattr *) nlmsg_tail(msg->nm_nlh); + + if (nla_put(msg, attrtype, 0, NULL) < 0) + return NULL; + + return start; +} + +/** + * Finalize nesting of attributes. + * @arg msg Netlink message. + * @arg start Container attribute as returned from nla_nest_start(). + * + * Corrects the container attribute header to include the appeneded attributes. + * + * @return 0 + */ +static inline int nla_nest_end(struct nl_msg *msg, struct nlattr *start) +{ + start->nla_len = (unsigned char *) nlmsg_tail(msg->nm_nlh) - + (unsigned char *) start; + return 0; +} + +/** + * Create attribute index based on nested attribute + * @arg tb Index array to be filled (maxtype+1 elements). + * @arg maxtype Maximum attribute type expected and accepted. + * @arg nla Nested Attribute. + * @arg policy Attribute validation policy. + * + * Feeds the stream of attributes nested into the specified attribute + * to nla_parse(). + * + * @see nla_parse + * @return 0 on success or a negative error code. + */ +static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, + struct nla_policy *policy) +{ + return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); +} + +/** + * Compare attribute payload with memory area. + * @arg nla Attribute. + * @arg data Memory area to compare to. + * @arg size Number of bytes to compare. + * + * @see memcmp(3) + * @return An integer less than, equal to, or greater than zero. + */ +static inline int nla_memcmp(const struct nlattr *nla, const void *data, size_t size) +{ + int d = nla_len(nla) - size; + + if (d == 0) + d = memcmp(nla_data(nla), data, size); + + return d; +} + +/** + * Compare string attribute payload with string + * @arg nla Attribute of type NLA_STRING. + * @arg str NUL terminated string. + * + * @see strcmp(3) + * @return An integer less than, equal to, or greater than zero. + */ +static inline int nla_strcmp(const struct nlattr *nla, const char *str) +{ + int len = strlen(str) + 1; + int d = nla_len(nla) - len; + + if (d == 0) + d = memcmp(nla_data(nla), str, len); + + return d; +} + +/** + * Copy string attribute payload to a buffer. + * @arg dst Pointer to destination buffer. + * @arg nla Attribute of type NLA_STRING. + * @arg dstsize Size of destination buffer in bytes. + * + * Copies at most dstsize - 1 bytes to the destination buffer. + * The result is always a valid NUL terminated string. Unlike + * strlcpy the destination buffer is always padded out. + * + * @return The length of string attribute without the terminating NUL. + */ +static inline size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize) +{ + size_t srclen = nla_len(nla); + char *src = nla_data(nla); + + if (srclen > 0 && src[srclen - 1] == '\0') + srclen--; + + if (dstsize > 0) { + size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen; + + memset(dst, 0, dstsize); + memcpy(dst, src, len); + } + + return srclen; +} + + +/** + * @name Attribute Construction (Exception Based) + * @{ + */ + +/** + * @ingroup attr + * Add unspecific attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg attrlen Length of attribute payload. + * @arg data Head of attribute payload. + */ +#define NLA_PUT(msg, attrtype, attrlen, data) \ + do { \ + if (nla_put(msg, attrtype, attrlen, data) < 0) \ + goto nla_put_failure; \ + } while(0) + +/** + * @ingroup attr + * Add atomic type attribute to netlink message. + * @arg msg Netlink message. + * @arg type Atomic type. + * @arg attrtype Attribute type. + * @arg value Head of attribute payload. + */ +#define NLA_PUT_TYPE(msg, type, attrtype, value) \ + do { \ + type __tmp = value; \ + NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \ + } while(0) + +/** + * Add 8 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value. + */ +#define NLA_PUT_U8(msg, attrtype, value) \ + NLA_PUT_TYPE(msg, uint8_t, attrtype, value) + +/** + * Add 16 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value. + */ +#define NLA_PUT_U16(msg, attrtype, value) \ + NLA_PUT_TYPE(msg, uint16_t, attrtype, value) + +/** + * Add 32 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value. + */ +#define NLA_PUT_U32(msg, attrtype, value) \ + NLA_PUT_TYPE(msg, uint32_t, attrtype, value) + +/** + * Add 64 bit integer attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value Numeric value. + */ +#define NLA_PUT_U64(msg, attrtype, value) \ + NLA_PUT_TYPE(msg, uint64_t, attrtype, value) + +/** + * Add string attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg value NUL terminated character string. + */ +#define NLA_PUT_STRING(msg, attrtype, value) \ + NLA_PUT(msg, attrtype, strlen(value) + 1, value) + +/** + * Add flag attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + */ +#define NLA_PUT_FLAG(msg, attrtype) \ + NLA_PUT(msg, attrtype, 0, NULL) + +/** + * Add msecs attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg msecs Numeric value in micro seconds. + */ +#define NLA_PUT_MSECS(msg, attrtype, msecs) \ + NLA_PUT_U64(msg, attrtype, msecs) + +/** + * Add address attribute to netlink message. + * @arg msg Netlink message. + * @arg attrtype Attribute type. + * @arg addr Abstract address object. + */ +#define NLA_PUT_ADDR(msg, attrtype, addr) \ + NLA_PUT(msg, attrtype, nl_addr_get_len(addr), \ + nl_addr_get_binary_addr(addr)) + +/** @} */ + +/** + * @name Iterators + * @{ + */ + +/** + * @ingroup attr + * Iterate over a stream of attributes + * @arg pos loop counter, set to current attribute + * @arg head head of attribute stream + * @arg len length of attribute stream + * @arg rem initialized to len, holds bytes currently remaining in stream + */ +#define nla_for_each_attr(pos, head, len, rem) \ + for (pos = head, rem = len; \ + nla_ok(pos, rem); \ + pos = nla_next(pos, &(rem))) + +/** + * @ingroup attr + * Iterate over a stream of nested attributes + * @arg pos loop counter, set to current attribute + * @arg nla attribute containing the nested attributes + * @arg rem initialized to len, holds bytes currently remaining in stream + */ +#define nla_for_each_nested(pos, nla, rem) \ + for (pos = nla_data(nla), rem = nla_len(nla); \ + nla_ok(pos, rem); \ + pos = nla_next(pos, &(rem))) + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/cache-api.h b/package/libnl-tiny/src/include/netlink/cache-api.h new file mode 100644 index 0000000..22fc449 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/cache-api.h @@ -0,0 +1,199 @@ +/* + * netlink/cache-api.h Caching API + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_CACHE_API_H_ +#define NETLINK_CACHE_API_H_ + +#include <netlink/netlink.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @ingroup cache + * @defgroup cache_api Cache Implementation + * @brief + * + * @par 1) Cache Definition + * @code + * struct nl_cache_ops my_cache_ops = { + * .co_name = "route/link", + * .co_protocol = NETLINK_ROUTE, + * .co_hdrsize = sizeof(struct ifinfomsg), + * .co_obj_ops = &my_obj_ops, + * }; + * @endcode + * + * @par 2) + * @code + * // The simplest way to fill a cache is by providing a request-update + * // function which must trigger a complete dump on the kernel-side of + * // whatever the cache covers. + * static int my_request_update(struct nl_cache *cache, + * struct nl_sock *socket) + * { + * // In this example, we request a full dump of the interface table + * return nl_rtgen_request(socket, RTM_GETLINK, AF_UNSPEC, NLM_F_DUMP); + * } + * + * // The resulting netlink messages sent back will be fed into a message + * // parser one at a time. The message parser has to extract all relevant + * // information from the message and create an object reflecting the + * // contents of the message and pass it on to the parser callback function + * // provide which will add the object to the cache. + * static int my_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who, + * struct nlmsghdr *nlh, struct nl_parser_param *pp) + * { + * struct my_obj *obj; + * + * obj = my_obj_alloc(); + * obj->ce_msgtype = nlh->nlmsg_type; + * + * // Parse the netlink message and continue creating the object. + * + * err = pp->pp_cb((struct nl_object *) obj, pp); + * if (err < 0) + * goto errout; + * } + * + * struct nl_cache_ops my_cache_ops = { + * ... + * .co_request_update = my_request_update, + * .co_msg_parser = my_msg_parser, + * }; + * @endcode + * + * @par 3) Notification based Updates + * @code + * // Caches can be kept up-to-date based on notifications if the kernel + * // sends out notifications whenever an object is added/removed/changed. + * // + * // It is trivial to support this, first a list of groups needs to be + * // defined which are required to join in order to receive all necessary + * // notifications. The groups are separated by address family to support + * // the common situation where a separate group is used for each address + * // family. If there is only one group, simply specify AF_UNSPEC. + * static struct nl_af_group addr_groups[] = { + * { AF_INET, RTNLGRP_IPV4_IFADDR }, + * { AF_INET6, RTNLGRP_IPV6_IFADDR }, + * { END_OF_GROUP_LIST }, + * }; + * + * // In order for the caching system to know the meaning of each message + * // type it requires a table which maps each supported message type to + * // a cache action, e.g. RTM_NEWADDR means address has been added or + * // updated, RTM_DELADDR means address has been removed. + * static struct nl_cache_ops rtnl_addr_ops = { + * ... + * .co_msgtypes = { + * { RTM_NEWADDR, NL_ACT_NEW, "new" }, + * { RTM_DELADDR, NL_ACT_DEL, "del" }, + * { RTM_GETADDR, NL_ACT_GET, "get" }, + * END_OF_MSGTYPES_LIST, + * }, + * .co_groups = addr_groups, + * }; + * + * // It is now possible to keep the cache up-to-date using the cache manager. + * @endcode + * @{ + */ + +enum { + NL_ACT_UNSPEC, + NL_ACT_NEW, + NL_ACT_DEL, + NL_ACT_GET, + NL_ACT_SET, + NL_ACT_CHANGE, + __NL_ACT_MAX, +}; + +#define NL_ACT_MAX (__NL_ACT_MAX - 1) + +#define END_OF_MSGTYPES_LIST { -1, -1, NULL } + +/** + * Message type to cache action association + */ +struct nl_msgtype +{ + /** Netlink message type */ + int mt_id; + + /** Cache action to take */ + int mt_act; + + /** Name of operation for human-readable printing */ + char * mt_name; +}; + +/** + * Address family to netlink group association + */ +struct nl_af_group +{ + /** Address family */ + int ag_family; + + /** Netlink group identifier */ + int ag_group; +}; + +#define END_OF_GROUP_LIST AF_UNSPEC, 0 + +struct nl_parser_param +{ + int (*pp_cb)(struct nl_object *, struct nl_parser_param *); + void * pp_arg; +}; + +/** + * Cache Operations + */ +struct nl_cache_ops +{ + char * co_name; + + int co_hdrsize; + int co_protocol; + struct nl_af_group * co_groups; + + /** + * Called whenever an update of the cache is required. Must send + * a request message to the kernel requesting a complete dump. + */ + int (*co_request_update)(struct nl_cache *, struct nl_sock *); + + /** + * Called whenever a message was received that needs to be parsed. + * Must parse the message and call the paser callback function + * (nl_parser_param) provided via the argument. + */ + int (*co_msg_parser)(struct nl_cache_ops *, struct sockaddr_nl *, + struct nlmsghdr *, struct nl_parser_param *); + + struct nl_object_ops * co_obj_ops; + + struct nl_cache_ops *co_next; + struct nl_cache *co_major_cache; + struct genl_ops * co_genl; + struct nl_msgtype co_msgtypes[]; +}; + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/cache.h b/package/libnl-tiny/src/include/netlink/cache.h new file mode 100644 index 0000000..f4db3b9 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/cache.h @@ -0,0 +1,126 @@ +/* + * netlink/cache.h Caching Module + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_CACHE_H_ +#define NETLINK_CACHE_H_ + +#include <netlink/netlink.h> +#include <netlink/msg.h> +#include <netlink/utils.h> +#include <netlink/object.h> +#include <netlink/cache-api.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_cache; + +typedef void (*change_func_t)(struct nl_cache *, struct nl_object *, int); + +/* Access Functions */ +extern int nl_cache_nitems(struct nl_cache *); +extern int nl_cache_nitems_filter(struct nl_cache *, + struct nl_object *); +extern struct nl_cache_ops * nl_cache_get_ops(struct nl_cache *); +extern struct nl_object * nl_cache_get_first(struct nl_cache *); +extern struct nl_object * nl_cache_get_last(struct nl_cache *); +extern struct nl_object * nl_cache_get_next(struct nl_object *); +extern struct nl_object * nl_cache_get_prev(struct nl_object *); + +extern struct nl_cache * nl_cache_alloc(struct nl_cache_ops *); +extern int nl_cache_alloc_and_fill(struct nl_cache_ops *, + struct nl_sock *, + struct nl_cache **); +extern int nl_cache_alloc_name(const char *, + struct nl_cache **); +extern struct nl_cache * nl_cache_subset(struct nl_cache *, + struct nl_object *); +extern void nl_cache_clear(struct nl_cache *); +extern void nl_cache_free(struct nl_cache *); + +/* Cache modification */ +extern int nl_cache_add(struct nl_cache *, + struct nl_object *); +extern int nl_cache_parse_and_add(struct nl_cache *, + struct nl_msg *); +extern void nl_cache_remove(struct nl_object *); +extern int nl_cache_refill(struct nl_sock *, + struct nl_cache *); +extern int nl_cache_pickup(struct nl_sock *, + struct nl_cache *); +extern int nl_cache_resync(struct nl_sock *, + struct nl_cache *, + change_func_t); +extern int nl_cache_include(struct nl_cache *, + struct nl_object *, + change_func_t); + +/* General */ +extern int nl_cache_is_empty(struct nl_cache *); +extern void nl_cache_mark_all(struct nl_cache *); + +/* Dumping */ +extern void nl_cache_dump(struct nl_cache *, + struct nl_dump_params *); +extern void nl_cache_dump_filter(struct nl_cache *, + struct nl_dump_params *, + struct nl_object *); + +/* Iterators */ +extern void nl_cache_foreach(struct nl_cache *, + void (*cb)(struct nl_object *, + void *), + void *arg); +extern void nl_cache_foreach_filter(struct nl_cache *, + struct nl_object *, + void (*cb)(struct + nl_object *, + void *), + void *arg); + +/* --- cache management --- */ + +/* Cache type management */ +extern struct nl_cache_ops * nl_cache_ops_lookup(const char *); +extern struct nl_cache_ops * nl_cache_ops_associate(int, int); +extern struct nl_msgtype * nl_msgtype_lookup(struct nl_cache_ops *, int); +extern void nl_cache_ops_foreach(void (*cb)(struct nl_cache_ops *, void *), void *); +extern int nl_cache_mngt_register(struct nl_cache_ops *); +extern int nl_cache_mngt_unregister(struct nl_cache_ops *); + +/* Global cache provisioning/requiring */ +extern void nl_cache_mngt_provide(struct nl_cache *); +extern void nl_cache_mngt_unprovide(struct nl_cache *); +extern struct nl_cache * nl_cache_mngt_require(const char *); + +struct nl_cache_mngr; + +#define NL_AUTO_PROVIDE 1 + +extern int nl_cache_mngr_alloc(struct nl_sock *, + int, int, + struct nl_cache_mngr **); +extern int nl_cache_mngr_add(struct nl_cache_mngr *, + const char *, + change_func_t, + struct nl_cache **); +extern int nl_cache_mngr_get_fd(struct nl_cache_mngr *); +extern int nl_cache_mngr_poll(struct nl_cache_mngr *, + int); +extern int nl_cache_mngr_data_ready(struct nl_cache_mngr *); +extern void nl_cache_mngr_free(struct nl_cache_mngr *); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/data.h b/package/libnl-tiny/src/include/netlink/data.h new file mode 100644 index 0000000..071159e --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/data.h @@ -0,0 +1,41 @@ +/* + * netlink/data.h Abstract Data + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_DATA_H_ +#define NETLINK_DATA_H_ + +#include <netlink/netlink.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_data; + +/* General */ +extern struct nl_data * nl_data_alloc(void *, size_t); +extern struct nl_data * nl_data_alloc_attr(struct nlattr *); +extern struct nl_data * nl_data_clone(struct nl_data *); +extern int nl_data_append(struct nl_data *, void *, size_t); +extern void nl_data_free(struct nl_data *); + +/* Access Functions */ +extern void * nl_data_get(struct nl_data *); +extern size_t nl_data_get_size(struct nl_data *); + +/* Misc */ +extern int nl_data_cmp(struct nl_data *, struct nl_data *); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/errno.h b/package/libnl-tiny/src/include/netlink/errno.h new file mode 100644 index 0000000..0b43da0 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/errno.h @@ -0,0 +1,59 @@ +/* + * netlink/errno.h Error Numbers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_ERRNO_H_ +#define NETLINK_ERRNO_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +#define NLE_SUCCESS 0 +#define NLE_FAILURE 1 +#define NLE_INTR 2 +#define NLE_BAD_SOCK 3 +#define NLE_AGAIN 4 +#define NLE_NOMEM 5 +#define NLE_EXIST 6 +#define NLE_INVAL 7 +#define NLE_RANGE 8 +#define NLE_MSGSIZE 9 +#define NLE_OPNOTSUPP 10 +#define NLE_AF_NOSUPPORT 11 +#define NLE_OBJ_NOTFOUND 12 +#define NLE_NOATTR 13 +#define NLE_MISSING_ATTR 14 +#define NLE_AF_MISMATCH 15 +#define NLE_SEQ_MISMATCH 16 +#define NLE_MSG_OVERFLOW 17 +#define NLE_MSG_TRUNC 18 +#define NLE_NOADDR 19 +#define NLE_SRCRT_NOSUPPORT 20 +#define NLE_MSG_TOOSHORT 21 +#define NLE_MSGTYPE_NOSUPPORT 22 +#define NLE_OBJ_MISMATCH 23 +#define NLE_NOCACHE 24 +#define NLE_BUSY 25 +#define NLE_PROTO_MISMATCH 26 +#define NLE_NOACCESS 27 +#define NLE_PERM 28 + +#define NLE_MAX NLE_PERM + +extern const char * nl_geterror(int); +extern void nl_perror(int, const char *); +extern int nl_syserr2nlerr(int); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/genl/ctrl.h b/package/libnl-tiny/src/include/netlink/genl/ctrl.h new file mode 100644 index 0000000..1ae62f4 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/genl/ctrl.h @@ -0,0 +1,37 @@ +/* + * netlink/genl/ctrl.h Generic Netlink Controller + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_GENL_CTRL_H_ +#define NETLINK_GENL_CTRL_H_ + +#include <netlink/netlink.h> +#include <netlink/cache.h> +#include <netlink/addr.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct genl_family; + +extern int genl_ctrl_alloc_cache(struct nl_sock *, + struct nl_cache **); +extern struct genl_family * genl_ctrl_search(struct nl_cache *, int); +extern struct genl_family * genl_ctrl_search_by_name(struct nl_cache *, + const char *); +extern int genl_ctrl_resolve(struct nl_sock *, + const char *); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/genl/family.h b/package/libnl-tiny/src/include/netlink/genl/family.h new file mode 100644 index 0000000..0257cbe --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/genl/family.h @@ -0,0 +1,130 @@ +/* + * netlink/genl/family.h Generic Netlink Family + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_GENL_FAMILY_H_ +#define NETLINK_GENL_FAMILY_H_ + +#include <netlink/netlink.h> +#include <netlink/cache.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** @cond SKIP */ +#define FAMILY_ATTR_ID 0x01 +#define FAMILY_ATTR_NAME 0x02 +#define FAMILY_ATTR_VERSION 0x04 +#define FAMILY_ATTR_HDRSIZE 0x08 +#define FAMILY_ATTR_MAXATTR 0x10 +#define FAMILY_ATTR_OPS 0x20 + + +struct genl_family +{ + NLHDR_COMMON + + uint16_t gf_id; + char gf_name[GENL_NAMSIZ]; + uint32_t gf_version; + uint32_t gf_hdrsize; + uint32_t gf_maxattr; + + struct nl_list_head gf_ops; +}; + + +extern struct genl_family * genl_family_alloc(void); +extern void genl_family_put(struct genl_family *); + +extern int genl_family_add_op(struct genl_family *, + int, int); + +/** + * @name Attributes + * @{ + */ + +static inline unsigned int genl_family_get_id(struct genl_family *family) +{ + if (family->ce_mask & FAMILY_ATTR_ID) + return family->gf_id; + else + return GENL_ID_GENERATE; +} + +static inline void genl_family_set_id(struct genl_family *family, unsigned int id) +{ + family->gf_id = id; + family->ce_mask |= FAMILY_ATTR_ID; +} + +static inline char *genl_family_get_name(struct genl_family *family) +{ + if (family->ce_mask & FAMILY_ATTR_NAME) + return family->gf_name; + else + return NULL; +} + +static inline void genl_family_set_name(struct genl_family *family, const char *name) +{ + strncpy(family->gf_name, name, GENL_NAMSIZ-1); + family->ce_mask |= FAMILY_ATTR_NAME; +} + +static inline uint8_t genl_family_get_version(struct genl_family *family) +{ + if (family->ce_mask & FAMILY_ATTR_VERSION) + return family->gf_version; + else + return 0; +} + +static inline void genl_family_set_version(struct genl_family *family, uint8_t version) +{ + family->gf_version = version; + family->ce_mask |= FAMILY_ATTR_VERSION; +} + +static inline uint32_t genl_family_get_hdrsize(struct genl_family *family) +{ + if (family->ce_mask & FAMILY_ATTR_HDRSIZE) + return family->gf_hdrsize; + else + return 0; +} + +static inline void genl_family_set_hdrsize(struct genl_family *family, uint32_t hdrsize) +{ + family->gf_hdrsize = hdrsize; + family->ce_mask |= FAMILY_ATTR_HDRSIZE; +} + +static inline uint32_t genl_family_get_maxattr(struct genl_family *family) +{ + if (family->ce_mask & FAMILY_ATTR_MAXATTR) + return family->gf_maxattr; + else + return family->gf_maxattr; +} + +static inline void genl_family_set_maxattr(struct genl_family *family, uint32_t maxattr) +{ + family->gf_maxattr = maxattr; + family->ce_mask |= FAMILY_ATTR_MAXATTR; +} + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/genl/genl.h b/package/libnl-tiny/src/include/netlink/genl/genl.h new file mode 100644 index 0000000..3f3340c --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/genl/genl.h @@ -0,0 +1,47 @@ +/* + * netlink/genl/genl.h Generic Netlink + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_GENL_H_ +#define NETLINK_GENL_H_ + +#include <netlink/netlink.h> +#include <netlink/msg.h> +#include <netlink/attr.h> + +#ifdef __cplusplus +extern "C" { +#endif + +extern int genl_connect(struct nl_sock *); + +extern int genl_send_simple(struct nl_sock *, int, int, + int, int); + +extern void * genlmsg_put(struct nl_msg *, uint32_t, uint32_t, + int, int, int, uint8_t, uint8_t); + +extern int genlmsg_valid_hdr(struct nlmsghdr *, int); +extern int genlmsg_validate(struct nlmsghdr *, int, int, + struct nla_policy *); +extern int genlmsg_parse(struct nlmsghdr *, int, struct nlattr **, + int, struct nla_policy *); +extern void * genlmsg_data(const struct genlmsghdr *); +extern int genlmsg_len(const struct genlmsghdr *); +extern struct nlattr * genlmsg_attrdata(const struct genlmsghdr *, int); +extern int genlmsg_attrlen(const struct genlmsghdr *, int); + +extern char * genl_op2name(int, int, char *, size_t); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/genl/mngt.h b/package/libnl-tiny/src/include/netlink/genl/mngt.h new file mode 100644 index 0000000..8b0244f --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/genl/mngt.h @@ -0,0 +1,87 @@ +/* + * netlink/genl/mngt.h Generic Netlink Management + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_GENL_MNGT_H_ +#define NETLINK_GENL_MNGT_H_ + +#include <netlink/netlink.h> +#include <netlink/attr.h> +#include <netlink/list.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_cache_ops; + +struct genl_info +{ + struct sockaddr_nl * who; + struct nlmsghdr * nlh; + struct genlmsghdr * genlhdr; + void * userhdr; + struct nlattr ** attrs; +}; + +/** + * @ingroup genl_mngt + * Generic Netlink Command + */ +struct genl_cmd +{ + /** Unique command identifier */ + int c_id; + + /** Name/description of command */ + char * c_name; + + /** + * Maximum attribute identifier, must be provided if + * a message parser is available. + */ + int c_maxattr; + + int (*c_msg_parser)(struct nl_cache_ops *, + struct genl_cmd *, + struct genl_info *, void *); + + /** + * Attribute validation policy (optional) + */ + struct nla_policy * c_attr_policy; +}; + +/** + * @ingroup genl_mngt + * Generic Netlink Operations + */ +struct genl_ops +{ + int o_family; + int o_id; + char * o_name; + struct nl_cache_ops * o_cache_ops; + struct genl_cmd * o_cmds; + int o_ncmds; + + /* linked list of all genl cache operations */ + struct nl_list_head o_list; +}; + + +extern int genl_register(struct nl_cache_ops *); +extern void genl_unregister(struct nl_cache_ops *); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/handlers.h b/package/libnl-tiny/src/include/netlink/handlers.h new file mode 100644 index 0000000..5c62368 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/handlers.h @@ -0,0 +1,230 @@ +/* + * netlink/handlers.c default netlink message handlers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_HANDLERS_H_ +#define NETLINK_HANDLERS_H_ + +#include <stdio.h> +#include <stdint.h> +#include <sys/types.h> +#include <netlink/netlink-compat.h> +#include <netlink/netlink-kernel.h> +#include <netlink/types.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nl_sock; +struct nl_msg; +struct nl_cb; +/** + * @name Callback Typedefs + * @{ + */ + +/** + * nl_recvmsgs() callback for message processing customization + * @ingroup cb + * @arg msg netlink message being processed + * @arg arg argument passwd on through caller + */ +typedef int (*nl_recvmsg_msg_cb_t)(struct nl_msg *msg, void *arg); + +/** + * nl_recvmsgs() callback for error message processing customization + * @ingroup cb + * @arg nla netlink address of the peer + * @arg nlerr netlink error message being processed + * @arg arg argument passed on through caller + */ +typedef int (*nl_recvmsg_err_cb_t)(struct sockaddr_nl *nla, + struct nlmsgerr *nlerr, void *arg); + +/** @} */ + +/** + * Callback actions + * @ingroup cb + */ +enum nl_cb_action { + /** Proceed with wathever would come next */ + NL_OK, + /** Skip this message */ + NL_SKIP, + /** Stop parsing altogether and discard remaining messages */ + NL_STOP, +}; + +/** + * Callback kinds + * @ingroup cb + */ +enum nl_cb_kind { + /** Default handlers (quiet) */ + NL_CB_DEFAULT, + /** Verbose default handlers (error messages printed) */ + NL_CB_VERBOSE, + /** Debug handlers for debugging */ + NL_CB_DEBUG, + /** Customized handler specified by the user */ + NL_CB_CUSTOM, + __NL_CB_KIND_MAX, +}; + +#define NL_CB_KIND_MAX (__NL_CB_KIND_MAX - 1) + +/** + * Callback types + * @ingroup cb + */ +enum nl_cb_type { + /** Message is valid */ + NL_CB_VALID, + /** Last message in a series of multi part messages received */ + NL_CB_FINISH, + /** Report received that data was lost */ + NL_CB_OVERRUN, + /** Message wants to be skipped */ + NL_CB_SKIPPED, + /** Message is an acknowledge */ + NL_CB_ACK, + /** Called for every message received */ + NL_CB_MSG_IN, + /** Called for every message sent out except for nl_sendto() */ + NL_CB_MSG_OUT, + /** Message is malformed and invalid */ + NL_CB_INVALID, + /** Called instead of internal sequence number checking */ + NL_CB_SEQ_CHECK, + /** Sending of an acknowledge message has been requested */ + NL_CB_SEND_ACK, + __NL_CB_TYPE_MAX, +}; + +#define NL_CB_TYPE_MAX (__NL_CB_TYPE_MAX - 1) + +struct nl_cb +{ + nl_recvmsg_msg_cb_t cb_set[NL_CB_TYPE_MAX+1]; + void * cb_args[NL_CB_TYPE_MAX+1]; + + nl_recvmsg_err_cb_t cb_err; + void * cb_err_arg; + + /** May be used to replace nl_recvmsgs with your own implementation + * in all internal calls to nl_recvmsgs. */ + int (*cb_recvmsgs_ow)(struct nl_sock *, + struct nl_cb *); + + /** Overwrite internal calls to nl_recv, must return the number of + * octets read and allocate a buffer for the received data. */ + int (*cb_recv_ow)(struct nl_sock *, + struct sockaddr_nl *, + unsigned char **, + struct ucred **); + + /** Overwrites internal calls to nl_send, must send the netlink + * message. */ + int (*cb_send_ow)(struct nl_sock *, + struct nl_msg *); + + int cb_refcnt; +}; + + +extern struct nl_cb * nl_cb_alloc(enum nl_cb_kind); +extern struct nl_cb * nl_cb_clone(struct nl_cb *); +extern void nl_cb_put(struct nl_cb *); + +extern int nl_cb_set(struct nl_cb *, enum nl_cb_type, enum nl_cb_kind, + nl_recvmsg_msg_cb_t, void *); +extern int nl_cb_err(struct nl_cb *, enum nl_cb_kind, nl_recvmsg_err_cb_t, + void *); + +static inline struct nl_cb *nl_cb_get(struct nl_cb *cb) +{ + cb->cb_refcnt++; + + return cb; +} + +/** + * Set up a all callbacks + * @arg cb callback set + * @arg kind kind of callback + * @arg func callback function + * @arg arg argument to be passwd to callback function + * + * @return 0 on success or a negative error code + */ +static inline int nl_cb_set_all(struct nl_cb *cb, enum nl_cb_kind kind, + nl_recvmsg_msg_cb_t func, void *arg) +{ + int i, err; + + for (i = 0; i <= NL_CB_TYPE_MAX; i++) { + err = nl_cb_set(cb, i, kind, func, arg); + if (err < 0) + return err; + } + + return 0; +} + + +/** + * @name Overwriting + * @{ + */ + +/** + * Overwrite internal calls to nl_recvmsgs() + * @arg cb callback set + * @arg func replacement callback for nl_recvmsgs() + */ +static inline void nl_cb_overwrite_recvmsgs(struct nl_cb *cb, + int (*func)(struct nl_sock *, struct nl_cb *)) +{ + cb->cb_recvmsgs_ow = func; +} + +/** + * Overwrite internal calls to nl_recv() + * @arg cb callback set + * @arg func replacement callback for nl_recv() + */ +static inline void nl_cb_overwrite_recv(struct nl_cb *cb, + int (*func)(struct nl_sock *, struct sockaddr_nl *, + unsigned char **, struct ucred **)) +{ + cb->cb_recv_ow = func; +} + +/** + * Overwrite internal calls to nl_send() + * @arg cb callback set + * @arg func replacement callback for nl_send() + */ +static inline void nl_cb_overwrite_send(struct nl_cb *cb, + int (*func)(struct nl_sock *, struct nl_msg *)) +{ + cb->cb_send_ow = func; +} + +/** @} */ + + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/list.h b/package/libnl-tiny/src/include/netlink/list.h new file mode 100644 index 0000000..c6876a7 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/list.h @@ -0,0 +1,88 @@ +/* + * netlink/list.h Netlink List Utilities + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_LIST_H_ +#define NETLINK_LIST_H_ + +struct nl_list_head +{ + struct nl_list_head * next; + struct nl_list_head * prev; +}; + + +static inline void __nl_list_add(struct nl_list_head *obj, + struct nl_list_head *prev, + struct nl_list_head *next) +{ + prev->next = obj; + obj->prev = prev; + next->prev = obj; + obj->next = next; +} + +static inline void nl_list_add_tail(struct nl_list_head *obj, + struct nl_list_head *head) +{ + __nl_list_add(obj, head->prev, head); +} + +static inline void nl_list_add_head(struct nl_list_head *obj, + struct nl_list_head *head) +{ + __nl_list_add(obj, head, head->next); +} + +static inline void nl_list_del(struct nl_list_head *obj) +{ + obj->next->prev = obj->prev; + obj->prev->next = obj->next; +} + +static inline int nl_list_empty(struct nl_list_head *head) +{ + return head->next == head; +} + +#define nl_container_of(ptr, type, member) ({ \ + const typeof( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - ((size_t) &((type *)0)->member));}) + +#define nl_list_entry(ptr, type, member) \ + nl_container_of(ptr, type, member) + +#define nl_list_at_tail(pos, head, member) \ + ((pos)->member.next == (head)) + +#define nl_list_at_head(pos, head, member) \ + ((pos)->member.prev == (head)) + +#define NL_LIST_HEAD(name) \ + struct nl_list_head name = { &(name), &(name) } + +#define nl_list_first_entry(head, type, member) \ + nl_list_entry((head)->next, type, member) + +#define nl_list_for_each_entry(pos, head, member) \ + for (pos = nl_list_entry((head)->next, typeof(*pos), member); \ + &(pos)->member != (head); \ + (pos) = nl_list_entry((pos)->member.next, typeof(*(pos)), member)) + +#define nl_list_for_each_entry_safe(pos, n, head, member) \ + for (pos = nl_list_entry((head)->next, typeof(*pos), member), \ + n = nl_list_entry(pos->member.next, typeof(*pos), member); \ + &(pos)->member != (head); \ + pos = n, n = nl_list_entry(n->member.next, typeof(*n), member)) + +#define nl_init_list_head(head) \ + do { (head)->next = (head); (head)->prev = (head); } while (0) + +#endif diff --git a/package/libnl-tiny/src/include/netlink/msg.h b/package/libnl-tiny/src/include/netlink/msg.h new file mode 100644 index 0000000..aedcb08 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/msg.h @@ -0,0 +1,308 @@ +/* + * netlink/msg.c Netlink Messages Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_MSG_H_ +#define NETLINK_MSG_H_ + +#include <netlink/netlink.h> +#include <netlink/object.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct nla_policy; + +#define NL_DONTPAD 0 + +/** + * @ingroup msg + * @brief + * Will cause the netlink pid to be set to the pid assigned to + * the netlink handle (socket) just before sending the message off. + * @note Requires the use of nl_send_auto_complete()! + */ +#define NL_AUTO_PID 0 + +/** + * @ingroup msg + * @brief + * May be used to refer to a sequence number which should be + * automatically set just before sending the message off. + * @note Requires the use of nl_send_auto_complete()! + */ +#define NL_AUTO_SEQ 0 + +#define NL_MSG_CRED_PRESENT 1 + +struct nl_msg +{ + int nm_protocol; + int nm_flags; + struct sockaddr_nl nm_src; + struct sockaddr_nl nm_dst; + struct ucred nm_creds; + struct nlmsghdr * nm_nlh; + size_t nm_size; + int nm_refcnt; +}; + + +struct nl_msg; +struct nl_tree; +struct ucred; + +/* message parsing */ +extern int nlmsg_ok(const struct nlmsghdr *, int); +extern struct nlmsghdr * nlmsg_next(struct nlmsghdr *, int *); +extern int nlmsg_parse(struct nlmsghdr *, int, struct nlattr **, + int, struct nla_policy *); +extern int nlmsg_validate(struct nlmsghdr *, int, int, + struct nla_policy *); + +extern struct nl_msg * nlmsg_alloc(void); +extern struct nl_msg * nlmsg_alloc_size(size_t); +extern struct nl_msg * nlmsg_alloc_simple(int, int); +extern void nlmsg_set_default_size(size_t); +extern struct nl_msg * nlmsg_inherit(struct nlmsghdr *); +extern struct nl_msg * nlmsg_convert(struct nlmsghdr *); +extern void * nlmsg_reserve(struct nl_msg *, size_t, int); +extern int nlmsg_append(struct nl_msg *, void *, size_t, int); + +extern struct nlmsghdr * nlmsg_put(struct nl_msg *, uint32_t, uint32_t, + int, int, int); +extern void nlmsg_free(struct nl_msg *); + +extern int nl_msg_parse(struct nl_msg *, + void (*cb)(struct nl_object *, void *), + void *); + +extern void nl_msg_dump(struct nl_msg *, FILE *); + +/** + * length of netlink message not including padding + * @arg payload length of message payload + */ +static inline int nlmsg_msg_size(int payload) +{ + return NLMSG_HDRLEN + payload; +} + +/** + * length of netlink message including padding + * @arg payload length of message payload + */ +static inline int nlmsg_total_size(int payload) +{ + return NLMSG_ALIGN(nlmsg_msg_size(payload)); +} + +/** + * length of padding at the message's tail + * @arg payload length of message payload + */ +static inline int nlmsg_padlen(int payload) +{ + return nlmsg_total_size(payload) - nlmsg_msg_size(payload); +} + +/** + * head of message payload + * @arg nlh netlink messsage header + */ +static inline void *nlmsg_data(const struct nlmsghdr *nlh) +{ + return (unsigned char *) nlh + NLMSG_HDRLEN; +} + +static inline void *nlmsg_tail(const struct nlmsghdr *nlh) +{ + return (unsigned char *) nlh + NLMSG_ALIGN(nlh->nlmsg_len); +} + +/** + * length of message payload + * @arg nlh netlink message header + */ +static inline int nlmsg_len(const struct nlmsghdr *nlh) +{ + return nlh->nlmsg_len - NLMSG_HDRLEN; +} + +/** + * head of attributes data + * @arg nlh netlink message header + * @arg hdrlen length of family specific header + */ +static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, int hdrlen) +{ + unsigned char *data = nlmsg_data(nlh); + return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); +} + +/** + * length of attributes data + * @arg nlh netlink message header + * @arg hdrlen length of family specific header + */ +static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) +{ + return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); +} + +static inline int nlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen) +{ + if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) + return 0; + + return 1; +} + + +static inline void nlmsg_set_proto(struct nl_msg *msg, int protocol) +{ + msg->nm_protocol = protocol; +} + +static inline int nlmsg_get_proto(struct nl_msg *msg) +{ + return msg->nm_protocol; +} + +static inline size_t nlmsg_get_max_size(struct nl_msg *msg) +{ + return msg->nm_size; +} + +static inline void nlmsg_set_src(struct nl_msg *msg, struct sockaddr_nl *addr) +{ + memcpy(&msg->nm_src, addr, sizeof(*addr)); +} + +static inline struct sockaddr_nl *nlmsg_get_src(struct nl_msg *msg) +{ + return &msg->nm_src; +} + +static inline void nlmsg_set_dst(struct nl_msg *msg, struct sockaddr_nl *addr) +{ + memcpy(&msg->nm_dst, addr, sizeof(*addr)); +} + +static inline struct sockaddr_nl *nlmsg_get_dst(struct nl_msg *msg) +{ + return &msg->nm_dst; +} + +static inline void nlmsg_set_creds(struct nl_msg *msg, struct ucred *creds) +{ + memcpy(&msg->nm_creds, creds, sizeof(*creds)); + msg->nm_flags |= NL_MSG_CRED_PRESENT; +} + +static inline struct ucred *nlmsg_get_creds(struct nl_msg *msg) +{ + if (msg->nm_flags & NL_MSG_CRED_PRESENT) + return &msg->nm_creds; + return NULL; +} + +/** + * Return actual netlink message + * @arg n netlink message + * + * Returns the actual netlink message casted to the type of the netlink + * message header. + * + * @return A pointer to the netlink message. + */ +static inline struct nlmsghdr *nlmsg_hdr(struct nl_msg *n) +{ + return n->nm_nlh; +} + +/** + * Acquire a reference on a netlink message + * @arg msg message to acquire reference from + */ +static inline void nlmsg_get(struct nl_msg *msg) +{ + msg->nm_refcnt++; +} + +/** + * Expand maximum payload size of a netlink message + * @arg n Netlink message. + * @arg newlen New maximum payload size. + * + * Reallocates the payload section of a netlink message and increases + * the maximum payload size of the message. + * + * @note Any pointers pointing to old payload block will be stale and + * need to be refetched. Therfore, do not expand while constructing + * nested attributes or while reserved data blocks are held. + * + * @return 0 on success or a negative error code. + */ +static inline int nlmsg_expand(struct nl_msg *n, size_t newlen) +{ + void *tmp; + + if (newlen <= n->nm_size) + return -NLE_INVAL; + + tmp = realloc(n->nm_nlh, newlen); + if (tmp == NULL) + return -NLE_NOMEM; + + n->nm_nlh = tmp; + n->nm_size = newlen; + + return 0; +} + + +/** + * @name Iterators + * @{ + */ + +/** + * @ingroup msg + * Iterate over a stream of attributes in a message + * @arg pos loop counter, set to current attribute + * @arg nlh netlink message header + * @arg hdrlen length of family header + * @arg rem initialized to len, holds bytes currently remaining in stream + */ +#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ + nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ + nlmsg_attrlen(nlh, hdrlen), rem) + +/** + * Iterate over a stream of messages + * @arg pos loop counter, set to current message + * @arg head head of message stream + * @arg len length of message stream + * @arg rem initialized to len, holds bytes currently remaining in stream + */ +#define nlmsg_for_each_msg(pos, head, len, rem) \ + for (pos = head, rem = len; \ + nlmsg_ok(pos, rem); \ + pos = nlmsg_next(pos, &(rem))) + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/netlink-compat.h b/package/libnl-tiny/src/include/netlink/netlink-compat.h new file mode 100644 index 0000000..17ec9fc --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/netlink-compat.h @@ -0,0 +1,50 @@ +/* + * netlink/netlink-compat.h Netlink Compatability + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_COMPAT_H_ +#define NETLINK_COMPAT_H_ + +#if !defined _LINUX_SOCKET_H && !defined _BITS_SOCKADDR_H +typedef unsigned short sa_family_t; +#endif + +#ifndef IFNAMSIZ +/** Maximum length of a interface name */ +#define IFNAMSIZ 16 +#endif + +/* patch 2.4.x if_arp */ +#ifndef ARPHRD_INFINIBAND +#define ARPHRD_INFINIBAND 32 +#endif + +/* patch 2.4.x eth header file */ +#ifndef ETH_P_MPLS_UC +#define ETH_P_MPLS_UC 0x8847 +#endif + +#ifndef ETH_P_MPLS_MC +#define ETH_P_MPLS_MC 0x8848 +#endif + +#ifndef ETH_P_EDP2 +#define ETH_P_EDP2 0x88A2 +#endif + +#ifndef ETH_P_HDLC +#define ETH_P_HDLC 0x0019 +#endif + +#ifndef AF_LLC +#define AF_LLC 26 +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/netlink-kernel.h b/package/libnl-tiny/src/include/netlink/netlink-kernel.h new file mode 100644 index 0000000..a0f5535 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/netlink-kernel.h @@ -0,0 +1,196 @@ +#ifndef __LINUX_NETLINK_H +#define __LINUX_NETLINK_H + +/** + * Netlink socket address + * @ingroup nl + */ +struct sockaddr_nl +{ + /** socket family (AF_NETLINK) */ + sa_family_t nl_family; + + /** Padding (unused) */ + unsigned short nl_pad; + + /** Unique process ID */ + uint32_t nl_pid; + + /** Multicast group subscriptions */ + uint32_t nl_groups; +}; + +/** + * Netlink message header + * @ingroup msg + */ +struct nlmsghdr +{ + /** + * Length of message including header. + */ + uint32_t nlmsg_len; + + /** + * Message type (content type) + */ + uint16_t nlmsg_type; + + /** + * Message flags + */ + uint16_t nlmsg_flags; + + /** + * Sequence number + */ + uint32_t nlmsg_seq; + + /** + * Netlink PID of the proccess sending the message. + */ + uint32_t nlmsg_pid; +}; + +/** + * @name Standard message flags + * @{ + */ + +/** + * Must be set on all request messages (typically from user space to + * kernel space). + * @ingroup msg + */ +#define NLM_F_REQUEST 1 + +/** + * Indicates the message is part of a multipart message terminated + * by NLMSG_DONE. + */ +#define NLM_F_MULTI 2 + +/** + * Request for an acknowledgment on success. + */ +#define NLM_F_ACK 4 + +/** + * Echo this request + */ +#define NLM_F_ECHO 8 + +/** @} */ + +/** + * @name Additional message flags for GET requests + * @{ + */ + +/** + * Return the complete table instead of a single entry. + * @ingroup msg + */ +#define NLM_F_ROOT 0x100 + +/** + * Return all entries matching criteria passed in message content. + */ +#define NLM_F_MATCH 0x200 + +/** + * Return an atomic snapshot of the table being referenced. This + * may require special privileges because it has the potential to + * interrupt service in the FE for a longer time. + */ +#define NLM_F_ATOMIC 0x400 + +/** + * Dump all entries + */ +#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) + +/** @} */ + +/** + * @name Additional messsage flags for NEW requests + * @{ + */ + +/** + * Replace existing matching config object with this request. + * @ingroup msg + */ +#define NLM_F_REPLACE 0x100 + +/** + * Don't replace the config object if it already exists. + */ +#define NLM_F_EXCL 0x200 + +/** + * Create config object if it doesn't already exist. + */ +#define NLM_F_CREATE 0x400 + +/** + * Add to the end of the object list. + */ +#define NLM_F_APPEND 0x800 + +/** @} */ + +/** + * @name Standard Message types + * @{ + */ + +/** + * No operation, message must be ignored + * @ingroup msg + */ +#define NLMSG_NOOP 0x1 + +/** + * The message signals an error and the payload contains a nlmsgerr + * structure. This can be looked at as a NACK and typically it is + * from FEC to CPC. + */ +#define NLMSG_ERROR 0x2 + +/** + * Message terminates a multipart message. + */ +#define NLMSG_DONE 0x3 + +/** + * The message signals that data got lost + */ +#define NLMSG_OVERRUN 0x4 + +/** + * Lower limit of reserved message types + */ +#define NLMSG_MIN_TYPE 0x10 + +/** @} */ + +/** + * Netlink error message + * @ingroup msg + */ +struct nlmsgerr +{ + /** Error code (errno number) */ + int error; + + /** Original netlink message causing the error */ + struct nlmsghdr msg; +}; + +struct nl_pktinfo +{ + __u32 group; +}; + +#endif /* __LINUX_NETLINK_H */ diff --git a/package/libnl-tiny/src/include/netlink/netlink.h b/package/libnl-tiny/src/include/netlink/netlink.h new file mode 100644 index 0000000..e06fb7f --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/netlink.h @@ -0,0 +1,82 @@ +/* + * netlink/netlink.h Netlink Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_NETLINK_H_ +#define NETLINK_NETLINK_H_ + +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <stdlib.h> +#include <sys/poll.h> +#include <sys/socket.h> +#include <sys/types.h> +#include <sys/time.h> +#include <netdb.h> +#include <netlink/netlink-compat.h> +#include <linux/netlink.h> +#include <linux/genetlink.h> +#include <netlink/version.h> +#include <netlink/errno.h> +#include <netlink/types.h> +#include <netlink/handlers.h> +#include <netlink/socket.h> + +#ifdef __cplusplus +extern "C" { +#endif + +extern int nl_debug; +extern struct nl_dump_params nl_debug_dp; + +/* Connection Management */ +extern int nl_connect(struct nl_sock *, int); +extern void nl_close(struct nl_sock *); + +/* Send */ +extern int nl_sendto(struct nl_sock *, void *, size_t); +extern int nl_sendmsg(struct nl_sock *, struct nl_msg *, + struct msghdr *); +extern int nl_send(struct nl_sock *, struct nl_msg *); +extern int nl_send_auto_complete(struct nl_sock *, + struct nl_msg *); +extern int nl_send_simple(struct nl_sock *, int, int, + void *, size_t); + +/* Receive */ +extern int nl_recv(struct nl_sock *, + struct sockaddr_nl *, unsigned char **, + struct ucred **); +extern int nl_recvmsgs(struct nl_sock *sk, struct nl_cb *cb); + +extern int nl_wait_for_ack(struct nl_sock *); + +/* Netlink Family Translations */ +extern char * nl_nlfamily2str(int, char *, size_t); +extern int nl_str2nlfamily(const char *); + +/** + * Receive a set of message from a netlink socket using handlers in nl_sock. + * @arg sk Netlink socket. + * + * Calls nl_recvmsgs() with the handlers configured in the netlink socket. + */ +static inline int nl_recvmsgs_default(struct nl_sock *sk) +{ + return nl_recvmsgs(sk, sk->s_cb); +} + + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/object-api.h b/package/libnl-tiny/src/include/netlink/object-api.h new file mode 100644 index 0000000..8a44fe9 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/object-api.h @@ -0,0 +1,331 @@ +/* + * netlink/object-api.c Object API + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2007 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_OBJECT_API_H_ +#define NETLINK_OBJECT_API_H_ + +#include <netlink/netlink.h> +#include <netlink/utils.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @ingroup object + * @defgroup object_api Object API + * @brief + * + * @par 1) Object Definition + * @code + * // Define your object starting with the common object header + * struct my_obj { + * NLHDR_COMMON + * int my_data; + * }; + * + * // Fill out the object operations structure + * struct nl_object_ops my_ops = { + * .oo_name = "my_obj", + * .oo_size = sizeof(struct my_obj), + * }; + * + * // At this point the object can be allocated, you may want to provide a + * // separate _alloc() function to ease allocting objects of this kind. + * struct nl_object *obj = nl_object_alloc(&my_ops); + * + * // And release it again... + * nl_object_put(obj); + * @endcode + * + * @par 2) Allocating additional data + * @code + * // You may require to allocate additional data and store it inside + * // object, f.e. assuming there is a field `ptr'. + * struct my_obj { + * NLHDR_COMMON + * void * ptr; + * }; + * + * // And at some point you may assign allocated data to this field: + * my_obj->ptr = calloc(1, ...); + * + * // In order to not introduce any memory leaks you have to release + * // this data again when the last reference is given back. + * static void my_obj_free_data(struct nl_object *obj) + * { + * struct my_obj *my_obj = nl_object_priv(obj); + * + * free(my_obj->ptr); + * } + * + * // Also when the object is cloned, you must ensure for your pointer + * // stay valid even if one of the clones is freed by either making + * // a clone as well or increase the reference count. + * static int my_obj_clone(struct nl_object *src, struct nl_object *dst) + * { + * struct my_obj *my_src = nl_object_priv(src); + * struct my_obj *my_dst = nl_object_priv(dst); + * + * if (src->ptr) { + * dst->ptr = calloc(1, ...); + * memcpy(dst->ptr, src->ptr, ...); + * } + * } + * + * struct nl_object_ops my_ops = { + * ... + * .oo_free_data = my_obj_free_data, + * .oo_clone = my_obj_clone, + * }; + * @endcode + * + * @par 3) Object Dumping + * @code + * static int my_obj_dump_detailed(struct nl_object *obj, + * struct nl_dump_params *params) + * { + * struct my_obj *my_obj = nl_object_priv(obj); + * + * // It is absolutely essential to use nl_dump() when printing + * // any text to make sure the dumping parameters are respected. + * nl_dump(params, "Obj Integer: %d\n", my_obj->my_int); + * + * // Before we can dump the next line, make sure to prefix + * // this line correctly. + * nl_new_line(params); + * + * // You may also split a line into multiple nl_dump() calls. + * nl_dump(params, "String: %s ", my_obj->my_string); + * nl_dump(params, "String-2: %s\n", my_obj->another_string); + * } + * + * struct nl_object_ops my_ops = { + * ... + * .oo_dump[NL_DUMP_FULL] = my_obj_dump_detailed, + * }; + * @endcode + * + * @par 4) Object Attributes + * @code + * // The concept of object attributes is optional but can ease the typical + * // case of objects that have optional attributes, e.g. a route may have a + * // nexthop assigned but it is not required to. + * + * // The first step to define your object specific bitmask listing all + * // attributes + * #define MY_ATTR_FOO (1<<0) + * #define MY_ATTR_BAR (1<<1) + * + * // When assigning an optional attribute to the object, make sure + * // to mark its availability. + * my_obj->foo = 123123; + * my_obj->ce_mask |= MY_ATTR_FOO; + * + * // At any time you may use this mask to check for the availability + * // of the attribute, e.g. while dumping + * if (my_obj->ce_mask & MY_ATTR_FOO) + * nl_dump(params, "foo %d ", my_obj->foo); + * + * // One of the big advantages of this concept is that it allows for + * // standardized comparisons which make it trivial for caches to + * // identify unique objects by use of unified comparison functions. + * // In order for it to work, your object implementation must provide + * // a comparison function and define a list of attributes which + * // combined together make an object unique. + * + * static int my_obj_compare(struct nl_object *_a, struct nl_object *_b, + * uint32_t attrs, int flags) + * { + * struct my_obj *a = nl_object_priv(_a): + * struct my_obj *b = nl_object_priv(_b): + * int diff = 0; + * + * // We help ourselves in defining our own DIFF macro which will + * // call ATTR_DIFF() on both objects which will make sure to only + * // compare the attributes if required. + * #define MY_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, MY_ATTR_##ATTR, a, b, EXPR) + * + * // Call our own diff macro for each attribute to build a bitmask + * // representing the attributes which mismatch. + * diff |= MY_DIFF(FOO, a->foo != b->foo) + * diff |= MY_DIFF(BAR, strcmp(a->bar, b->bar)) + * + * return diff; + * } + * + * // In order to identify identical objects with differing attributes + * // you must specify the attributes required to uniquely identify + * // your object. Make sure to not include too many attributes, this + * // list is used when caches look for an old version of an object. + * struct nl_object_ops my_ops = { + * ... + * .oo_id_attrs = MY_ATTR_FOO, + * .oo_compare = my_obj_compare, + * }; + * @endcode + * @{ + */ + +/** + * Common Object Header + * + * This macro must be included as first member in every object + * definition to allow objects to be cached. + */ +#define NLHDR_COMMON \ + int ce_refcnt; \ + struct nl_object_ops * ce_ops; \ + struct nl_cache * ce_cache; \ + struct nl_list_head ce_list; \ + int ce_msgtype; \ + int ce_flags; \ + uint32_t ce_mask; + +/** + * Return true if attribute is available in both objects + * @arg A an object + * @arg B another object + * @arg ATTR attribute bit + * + * @return True if the attribute is available, otherwise false is returned. + */ +#define AVAILABLE(A, B, ATTR) (((A)->ce_mask & (B)->ce_mask) & (ATTR)) + +/** + * Return true if attributes mismatch + * @arg A an object + * @arg B another object + * @arg ATTR attribute bit + * @arg EXPR Comparison expression + * + * This function will check if the attribute in question is available + * in both objects, if not this will count as a mismatch. + * + * If available the function will execute the expression which must + * return true if the attributes mismatch. + * + * @return True if the attribute mismatch, or false if they match. + */ +#define ATTR_MISMATCH(A, B, ATTR, EXPR) (!AVAILABLE(A, B, ATTR) || (EXPR)) + +/** + * Return attribute bit if attribute does not match + * @arg LIST list of attributes to be compared + * @arg ATTR attribute bit + * @arg A an object + * @arg B another object + * @arg EXPR Comparison expression + * + * This function will check if the attribute in question is available + * in both objects, if not this will count as a mismatch. + * + * If available the function will execute the expression which must + * return true if the attributes mismatch. + * + * In case the attributes mismatch, the attribute is returned, otherwise + * 0 is returned. + * + * @code + * diff |= ATTR_DIFF(attrs, MY_ATTR_FOO, a, b, a->foo != b->foo); + * @endcode + */ +#define ATTR_DIFF(LIST, ATTR, A, B, EXPR) \ +({ int diff = 0; \ + if (((LIST) & (ATTR)) && ATTR_MISMATCH(A, B, ATTR, EXPR)) \ + diff = ATTR; \ + diff; }) + +/** + * Object Operations + */ +struct nl_object; +struct nl_object_ops +{ + /** + * Unique name of object type + * + * Must be in the form family/name, e.g. "route/addr" + */ + char * oo_name; + + /** Size of object including its header */ + size_t oo_size; + + /* List of attributes needed to uniquely identify the object */ + uint32_t oo_id_attrs; + + /** + * Constructor function + * + * Will be called when a new object of this type is allocated. + * Can be used to initialize members such as lists etc. + */ + void (*oo_constructor)(struct nl_object *); + + /** + * Destructor function + * + * Will be called when an object is freed. Must free all + * resources which may have been allocated as part of this + * object. + */ + void (*oo_free_data)(struct nl_object *); + + /** + * Cloning function + * + * Will be called when an object needs to be cloned. Please + * note that the generic object code will make an exact + * copy of the object first, therefore you only need to take + * care of members which require reference counting etc. + * + * May return a negative error code to abort cloning. + */ + int (*oo_clone)(struct nl_object *, struct nl_object *); + + /** + * Dumping functions + * + * Will be called when an object is dumped. The implementations + * have to use nl_dump(), nl_dump_line(), and nl_new_line() to + * dump objects. + * + * The functions must return the number of lines printed. + */ + void (*oo_dump[NL_DUMP_MAX+1])(struct nl_object *, + struct nl_dump_params *); + + /** + * Comparison function + * + * Will be called when two objects of the same type are + * compared. It takes the two objects in question, an object + * specific bitmask defining which attributes should be + * compared and flags to control the behaviour. + * + * The function must return a bitmask with the relevant bit + * set for each attribute that mismatches. + */ + int (*oo_compare)(struct nl_object *, struct nl_object *, + uint32_t, int); + + + char *(*oo_attrs2str)(int, char *, size_t); +}; + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/object.h b/package/libnl-tiny/src/include/netlink/object.h new file mode 100644 index 0000000..87385c4 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/object.h @@ -0,0 +1,144 @@ +/* + * netlink/object.c Generic Cacheable Object + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_OBJECT_H_ +#define NETLINK_OBJECT_H_ + +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/object-api.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#define NL_OBJ_MARK 1 + +struct nl_cache; +struct nl_object; +struct nl_object_ops; + +struct nl_object +{ + NLHDR_COMMON +}; + +#define OBJ_CAST(ptr) ((struct nl_object *) (ptr)) + +/* General */ +extern struct nl_object * nl_object_alloc(struct nl_object_ops *); +extern int nl_object_alloc_name(const char *, + struct nl_object **); +extern void nl_object_free(struct nl_object *); +extern struct nl_object * nl_object_clone(struct nl_object *obj); +extern void nl_object_get(struct nl_object *); +extern void nl_object_put(struct nl_object *); +extern void nl_object_dump(struct nl_object *, + struct nl_dump_params *); +extern int nl_object_identical(struct nl_object *, + struct nl_object *); +extern uint32_t nl_object_diff(struct nl_object *, + struct nl_object *); +extern int nl_object_match_filter(struct nl_object *, + struct nl_object *); +extern char * nl_object_attrs2str(struct nl_object *, + uint32_t attrs, char *buf, + size_t); +/** + * Check whether this object is used by multiple users + * @arg obj object to check + * @return true or false + */ +static inline int nl_object_shared(struct nl_object *obj) +{ + return obj->ce_refcnt > 1; +} + + + +/** + * @name Marks + * @{ + */ + +/** + * Add mark to object + * @arg obj Object to mark + */ +static inline void nl_object_mark(struct nl_object *obj) +{ + obj->ce_flags |= NL_OBJ_MARK; +} + +/** + * Remove mark from object + * @arg obj Object to unmark + */ +static inline void nl_object_unmark(struct nl_object *obj) +{ + obj->ce_flags &= ~NL_OBJ_MARK; +} + +/** + * Return true if object is marked + * @arg obj Object to check + * @return true if object is marked, otherwise false + */ +static inline int nl_object_is_marked(struct nl_object *obj) +{ + return (obj->ce_flags & NL_OBJ_MARK); +} + +/** @} */ + +/** + * Return list of attributes present in an object + * @arg obj an object + * @arg buf destination buffer + * @arg len length of destination buffer + * + * @return destination buffer. + */ +static inline char *nl_object_attr_list(struct nl_object *obj, char *buf, size_t len) +{ + return nl_object_attrs2str(obj, obj->ce_mask, buf, len); +} + + +/** + * @name Attributes + * @{ + */ + +static inline int nl_object_get_refcnt(struct nl_object *obj) +{ + return obj->ce_refcnt; +} + +static inline struct nl_cache *nl_object_get_cache(struct nl_object *obj) +{ + return obj->ce_cache; +} + +static inline void * nl_object_priv(struct nl_object *obj) +{ + return obj; +} + + +/** @} */ + + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/socket.h b/package/libnl-tiny/src/include/netlink/socket.h new file mode 100644 index 0000000..9f7f422 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/socket.h @@ -0,0 +1,221 @@ +/* + * netlink/socket.h Netlink Socket + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_SOCKET_H_ +#define NETLINK_SOCKET_H_ + +#include <netlink/types.h> +#include <netlink/handlers.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#define NL_SOCK_BUFSIZE_SET (1<<0) +#define NL_SOCK_PASSCRED (1<<1) +#define NL_OWN_PORT (1<<2) +#define NL_MSG_PEEK (1<<3) +#define NL_NO_AUTO_ACK (1<<4) + +struct nl_cb; +struct nl_sock +{ + struct sockaddr_nl s_local; + struct sockaddr_nl s_peer; + int s_fd; + int s_proto; + unsigned int s_seq_next; + unsigned int s_seq_expect; + int s_flags; + struct nl_cb * s_cb; +}; + + +extern struct nl_sock * nl_socket_alloc(void); +extern struct nl_sock * nl_socket_alloc_cb(struct nl_cb *); +extern void nl_socket_free(struct nl_sock *); + +extern void nl_socket_set_local_port(struct nl_sock *, uint32_t); + +extern int nl_socket_add_memberships(struct nl_sock *, int, ...); +extern int nl_socket_drop_memberships(struct nl_sock *, int, ...); + +extern int nl_socket_set_buffer_size(struct nl_sock *, int, int); +extern int nl_socket_set_passcred(struct nl_sock *, int); +extern int nl_socket_recv_pktinfo(struct nl_sock *, int); + +extern void nl_socket_disable_seq_check(struct nl_sock *); + +extern int nl_socket_set_nonblocking(struct nl_sock *); + +/** + * Use next sequence number + * @arg sk Netlink socket. + * + * Uses the next available sequence number and increases the counter + * by one for subsequent calls. + * + * @return Unique serial sequence number + */ +static inline unsigned int nl_socket_use_seq(struct nl_sock *sk) +{ + return sk->s_seq_next++; +} + +/** + * Disable automatic request for ACK + * @arg sk Netlink socket. + * + * The default behaviour of a socket is to request an ACK for + * each message sent to allow for the caller to synchronize to + * the completion of the netlink operation. This function + * disables this behaviour and will result in requests being + * sent which will not have the NLM_F_ACK flag set automatically. + * However, it is still possible for the caller to set the + * NLM_F_ACK flag explicitely. + */ +static inline void nl_socket_disable_auto_ack(struct nl_sock *sk) +{ + sk->s_flags |= NL_NO_AUTO_ACK; +} + +/** + * Enable automatic request for ACK (default) + * @arg sk Netlink socket. + * @see nl_socket_disable_auto_ack + */ +static inline void nl_socket_enable_auto_ack(struct nl_sock *sk) +{ + sk->s_flags &= ~NL_NO_AUTO_ACK; +} + +/** + * @name Source Idenficiation + * @{ + */ + +static inline uint32_t nl_socket_get_local_port(struct nl_sock *sk) +{ + return sk->s_local.nl_pid; +} + +/** + * Join multicast groups (deprecated) + * @arg sk Netlink socket. + * @arg groups Bitmask of groups to join. + * + * This function defines the old way of joining multicast group which + * has to be done prior to calling nl_connect(). It works on any kernel + * version but is very limited as only 32 groups can be joined. + */ +static inline void nl_join_groups(struct nl_sock *sk, int groups) +{ + sk->s_local.nl_groups |= groups; +} + +/** + * @name Peer Identfication + * @{ + */ + +static inline uint32_t nl_socket_get_peer_port(struct nl_sock *sk) +{ + return sk->s_peer.nl_pid; +} + +static inline void nl_socket_set_peer_port(struct nl_sock *sk, uint32_t port) +{ + sk->s_peer.nl_pid = port; +} + +/** @} */ + +/** + * @name File Descriptor + * @{ + */ + +static inline int nl_socket_get_fd(struct nl_sock *sk) +{ + return sk->s_fd; +} + +/** + * Enable use of MSG_PEEK when reading from socket + * @arg sk Netlink socket. + */ +static inline void nl_socket_enable_msg_peek(struct nl_sock *sk) +{ + sk->s_flags |= NL_MSG_PEEK; +} + +/** + * Disable use of MSG_PEEK when reading from socket + * @arg sk Netlink socket. + */ +static inline void nl_socket_disable_msg_peek(struct nl_sock *sk) +{ + sk->s_flags &= ~NL_MSG_PEEK; +} + +/** + * @name Callback Handler + * @{ + */ + +static inline struct nl_cb *nl_socket_get_cb(struct nl_sock *sk) +{ + return nl_cb_get(sk->s_cb); +} + +static inline void nl_socket_set_cb(struct nl_sock *sk, struct nl_cb *cb) +{ + nl_cb_put(sk->s_cb); + sk->s_cb = nl_cb_get(cb); +} + +/** + * Modify the callback handler associated to the socket + * @arg sk Netlink socket. + * @arg type which type callback to set + * @arg kind kind of callback + * @arg func callback function + * @arg arg argument to be passwd to callback function + * + * @see nl_cb_set + */ +static inline int nl_socket_modify_cb(struct nl_sock *sk, enum nl_cb_type type, + enum nl_cb_kind kind, nl_recvmsg_msg_cb_t func, + void *arg) +{ + return nl_cb_set(sk->s_cb, type, kind, func, arg); +} + +/** @} */ + +static inline int nl_socket_add_membership(struct nl_sock *sk, int group) +{ + return nl_socket_add_memberships(sk, group, 0); +} + + +static inline int nl_socket_drop_membership(struct nl_sock *sk, int group) +{ + return nl_socket_drop_memberships(sk, group, 0); +} + + + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/types.h b/package/libnl-tiny/src/include/netlink/types.h new file mode 100644 index 0000000..6d8aaf8 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/types.h @@ -0,0 +1,117 @@ +/* + * netlink/netlink-types.h Netlink Types + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef __NETLINK_TYPES_H_ +#define __NETLINK_TYPES_H_ + +#include <stdio.h> + +/** + * Dumping types (dp_type) + * @ingroup utils + */ +enum nl_dump_type { + NL_DUMP_LINE, /**< Dump object briefly on one line */ + NL_DUMP_DETAILS, /**< Dump all attributes but no statistics */ + NL_DUMP_STATS, /**< Dump all attributes including statistics */ + NL_DUMP_ENV, /**< Dump all attribtues as env variables */ + __NL_DUMP_MAX, +}; +#define NL_DUMP_MAX (__NL_DUMP_MAX - 1) + +/** + * Dumping parameters + * @ingroup utils + */ +struct nl_dump_params +{ + /** + * Specifies the type of dump that is requested. + */ + enum nl_dump_type dp_type; + + /** + * Specifies the number of whitespaces to be put in front + * of every new line (indentation). + */ + int dp_prefix; + + /** + * Causes the cache index to be printed for each element. + */ + int dp_print_index; + + /** + * Causes each element to be prefixed with the message type. + */ + int dp_dump_msgtype; + + /** + * A callback invoked for output + * + * Passed arguments are: + * - dumping parameters + * - string to append to the output + */ + void (*dp_cb)(struct nl_dump_params *, char *); + + /** + * A callback invoked for every new line, can be used to + * customize the indentation. + * + * Passed arguments are: + * - dumping parameters + * - line number starting from 0 + */ + void (*dp_nl_cb)(struct nl_dump_params *, int); + + /** + * User data pointer, can be used to pass data to callbacks. + */ + void *dp_data; + + /** + * File descriptor the dumping output should go to + */ + FILE * dp_fd; + + /** + * Alternatively the output may be redirected into a buffer + */ + char * dp_buf; + + /** + * Length of the buffer dp_buf + */ + size_t dp_buflen; + + /** + * PRIVATE + * Set if a dump was performed prior to the actual dump handler. + */ + int dp_pre_dump; + + /** + * PRIVATE + * Owned by the current caller + */ + int dp_ivar; + + unsigned int dp_line; +}; + +#define min_t(type,x,y) \ + ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) +#define max_t(type,x,y) \ + ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) + + +#endif diff --git a/package/libnl-tiny/src/include/netlink/utils.h b/package/libnl-tiny/src/include/netlink/utils.h new file mode 100644 index 0000000..480bab6 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/utils.h @@ -0,0 +1,78 @@ +/* + * netlink/utils.h Utility Functions + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_UTILS_H_ +#define NETLINK_UTILS_H_ + +#include <netlink/netlink.h> +#include <netlink/list.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @name Probability Constants + * @{ + */ + +/** + * Lower probability limit + * @ingroup utils + */ +#define NL_PROB_MIN 0x0 + +/** + * Upper probability limit + * @ingroup utils + */ +#define NL_PROB_MAX 0xffffffff + +/** @} */ + +/* unit pretty-printing */ +extern double nl_cancel_down_bytes(unsigned long long, char **); +extern double nl_cancel_down_bits(unsigned long long, char **); +extern double nl_cancel_down_us(uint32_t, char **); + +/* generic unit translations */ +extern long nl_size2int(const char *); +extern long nl_prob2int(const char *); + +/* time translations */ +extern int nl_get_hz(void); +extern uint32_t nl_us2ticks(uint32_t); +extern uint32_t nl_ticks2us(uint32_t); +extern int nl_str2msec(const char *, uint64_t *); +extern char * nl_msec2str(uint64_t, char *, size_t); + +/* link layer protocol translations */ +extern char * nl_llproto2str(int, char *, size_t); +extern int nl_str2llproto(const char *); + +/* ethernet protocol translations */ +extern char * nl_ether_proto2str(int, char *, size_t); +extern int nl_str2ether_proto(const char *); + +/* IP protocol translations */ +extern char * nl_ip_proto2str(int, char *, size_t); +extern int nl_str2ip_proto(const char *); + +/* Dumping helpers */ +extern void nl_new_line(struct nl_dump_params *); +extern void nl_dump(struct nl_dump_params *, const char *, ...); +extern void nl_dump_line(struct nl_dump_params *, const char *, ...); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/package/libnl-tiny/src/include/netlink/version.h b/package/libnl-tiny/src/include/netlink/version.h new file mode 100644 index 0000000..6a316d4 --- /dev/null +++ b/package/libnl-tiny/src/include/netlink/version.h @@ -0,0 +1,18 @@ +/* + * netlink/version.h Compile Time Versioning Information + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2008 Thomas Graf <tgraf@suug.ch> + */ + +#ifndef NETLINK_VERSION_H_ +#define NETLINK_VERSION_H_ + +#define LIBNL_STRING "libnl" +#define LIBNL_VERSION "2.0" + +#endif diff --git a/package/libnl-tiny/src/msg.c b/package/libnl-tiny/src/msg.c new file mode 100644 index 0000000..e84c281 --- /dev/null +++ b/package/libnl-tiny/src/msg.c @@ -0,0 +1,566 @@ +/* + * lib/msg.c Netlink Messages Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup core + * @defgroup msg Messages + * Netlink Message Construction/Parsing Interface + * + * The following information is partly extracted from RFC3549 + * (ftp://ftp.rfc-editor.org/in-notes/rfc3549.txt) + * + * @par Message Format + * Netlink messages consist of a byte stream with one or multiple + * Netlink headers and an associated payload. If the payload is too big + * to fit into a single message it, can be split over multiple Netlink + * messages, collectively called a multipart message. For multipart + * messages, the first and all following headers have the \c NLM_F_MULTI + * Netlink header flag set, except for the last header which has the + * Netlink header type \c NLMSG_DONE. + * + * @par + * The Netlink message header (\link nlmsghdr struct nlmsghdr\endlink) is shown below. + * @code + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Length | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Type | Flags | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Sequence Number | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Process ID (PID) | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * @endcode + * + * @par + * The netlink message header and payload must be aligned properly: + * @code + * <------- NLMSG_ALIGN(hlen) ------> <---- NLMSG_ALIGN(len) ---> + * +----------------------------+- - -+- - - - - - - - - - -+- - -+ + * | Header | Pad | Payload | Pad | + * | struct nlmsghdr | | | | + * +----------------------------+- - -+- - - - - - - - - - -+- - -+ + * @endcode + * @par + * Message Format: + * @code + * <--- nlmsg_total_size(payload) ---> + * <-- nlmsg_msg_size(payload) -> + * +----------+- - -+-------------+- - -+-------- - - + * | nlmsghdr | Pad | Payload | Pad | nlmsghdr + * +----------+- - -+-------------+- - -+-------- - - + * nlmsg_data(nlh)---^ ^ + * nlmsg_next(nlh)-----------------------+ + * @endcode + * @par + * The payload may consist of arbitary data but may have strict + * alignment and formatting rules depening on the specific netlink + * families. + * @par + * @code + * <---------------------- nlmsg_len(nlh) ---------------------> + * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> + * +----------------------+- - -+--------------------------------+ + * | Family Header | Pad | Attributes | + * +----------------------+- - -+--------------------------------+ + * nlmsg_attrdata(nlh, hdrlen)---^ + * @endcode + * @par The ACK Netlink Message + * This message is actually used to denote both an ACK and a NACK. + * Typically, the direction is from FEC to CPC (in response to an ACK + * request message). However, the CPC should be able to send ACKs back + * to FEC when requested. + * @code + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Netlink message header | + * | type = NLMSG_ERROR | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Error code | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | OLD Netlink message header | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * @endcode + * + * @par Example + * @code + * // Various methods exist to create/allocate a new netlink + * // message. + * // + * // nlmsg_alloc() will allocate an empty netlink message with + * // a maximum payload size which defaults to the page size of + * // the system. This default size can be modified using the + * // function nlmsg_set_default_size(). + * struct nl_msg *msg = nlmsg_alloc(); + * + * // Very often, the message type and message flags are known + * // at allocation time while the other fields are auto generated: + * struct nl_msg *msg = nlmsg_alloc_simple(MY_TYPE, MY_FLAGS); + * + * // Alternatively an existing netlink message header can be used + * // to inherit the header values: + * struct nlmsghdr hdr = { + * .nlmsg_type = MY_TYPE, + * .nlmsg_flags = MY_FLAGS, + * }; + * struct nl_msg *msg = nlmsg_inherit(&hdr); + * + * // Last but not least, netlink messages received from netlink sockets + * // can be converted into nl_msg objects using nlmsg_convert(). This + * // will create a message with a maximum payload size which equals the + * // length of the existing netlink message, therefore no more data can + * // be appened without calling nlmsg_expand() first. + * struct nl_msg *msg = nlmsg_convert(nlh_from_nl_sock); + * + * // Payload may be added to the message via nlmsg_append(). The fourth + * // parameter specifies the number of alignment bytes the data should + * // be padding with at the end. Common values are 0 to disable it or + * // NLMSG_ALIGNTO to ensure proper netlink message padding. + * nlmsg_append(msg, &mydata, sizeof(mydata), 0); + * + * // Sometimes it may be necessary to reserve room for data but defer + * // the actual copying to a later point, nlmsg_reserve() can be used + * // for this purpose: + * void *data = nlmsg_reserve(msg, sizeof(mydata), NLMSG_ALIGNTO); + * + * // Attributes may be added using the attributes interface. + * + * // After successful use of the message, the memory must be freed + * // using nlmsg_free() + * nlmsg_free(msg); + * @endcode + * + * @par 4) Parsing messages + * @code + * int n; + * unsigned char *buf; + * struct nlmsghdr *hdr; + * + * n = nl_recv(handle, NULL, &buf); + * + * hdr = (struct nlmsghdr *) buf; + * while (nlmsg_ok(hdr, n)) { + * // Process message here... + * hdr = nlmsg_next(hdr, &n); + * } + * @endcode + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/cache.h> +#include <netlink/attr.h> +#include <netlink/msg.h> +#include <linux/socket.h> + +static size_t default_msg_size; + +static void __init init_msg_size(void) +{ + default_msg_size = getpagesize(); +} + +/** + * @name Attribute Access + * @{ + */ + +//** @} */ + +/** + * @name Message Parsing + * @{ + */ + +/** + * check if the netlink message fits into the remaining bytes + * @arg nlh netlink message header + * @arg remaining number of bytes remaining in message stream + */ +int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) +{ + return (remaining >= sizeof(struct nlmsghdr) && + nlh->nlmsg_len >= sizeof(struct nlmsghdr) && + nlh->nlmsg_len <= remaining); +} + +/** + * next netlink message in message stream + * @arg nlh netlink message header + * @arg remaining number of bytes remaining in message stream + * + * @returns the next netlink message in the message stream and + * decrements remaining by the size of the current message. + */ +struct nlmsghdr *nlmsg_next(struct nlmsghdr *nlh, int *remaining) +{ + int totlen = NLMSG_ALIGN(nlh->nlmsg_len); + + *remaining -= totlen; + + return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); +} + +/** + * parse attributes of a netlink message + * @arg nlh netlink message header + * @arg hdrlen length of family specific header + * @arg tb destination array with maxtype+1 elements + * @arg maxtype maximum attribute type to be expected + * @arg policy validation policy + * + * See nla_parse() + */ +int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], + int maxtype, struct nla_policy *policy) +{ + if (!nlmsg_valid_hdr(nlh, hdrlen)) + return -NLE_MSG_TOOSHORT; + + return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), + nlmsg_attrlen(nlh, hdrlen), policy); +} + +/** + * nlmsg_validate - validate a netlink message including attributes + * @arg nlh netlinket message header + * @arg hdrlen length of familiy specific header + * @arg maxtype maximum attribute type to be expected + * @arg policy validation policy + */ +int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, + struct nla_policy *policy) +{ + if (!nlmsg_valid_hdr(nlh, hdrlen)) + return -NLE_MSG_TOOSHORT; + + return nla_validate(nlmsg_attrdata(nlh, hdrlen), + nlmsg_attrlen(nlh, hdrlen), maxtype, policy); +} + +/** @} */ + +/** + * @name Message Building/Access + * @{ + */ + +static struct nl_msg *__nlmsg_alloc(size_t len) +{ + struct nl_msg *nm; + + nm = calloc(1, sizeof(*nm)); + if (!nm) + goto errout; + + nm->nm_refcnt = 1; + + nm->nm_nlh = malloc(len); + if (!nm->nm_nlh) + goto errout; + + memset(nm->nm_nlh, 0, sizeof(struct nlmsghdr)); + + nm->nm_protocol = -1; + nm->nm_size = len; + nm->nm_nlh->nlmsg_len = nlmsg_total_size(0); + + NL_DBG(2, "msg %p: Allocated new message, maxlen=%zu\n", nm, len); + + return nm; +errout: + free(nm); + return NULL; +} + +/** + * Allocate a new netlink message with the default maximum payload size. + * + * Allocates a new netlink message without any further payload. The + * maximum payload size defaults to PAGESIZE or as otherwise specified + * with nlmsg_set_default_size(). + * + * @return Newly allocated netlink message or NULL. + */ +struct nl_msg *nlmsg_alloc(void) +{ + return __nlmsg_alloc(default_msg_size); +} + +/** + * Allocate a new netlink message with maximum payload size specified. + */ +struct nl_msg *nlmsg_alloc_size(size_t max) +{ + return __nlmsg_alloc(max); +} + +/** + * Allocate a new netlink message and inherit netlink message header + * @arg hdr Netlink message header template + * + * Allocates a new netlink message and inherits the original message + * header. If \a hdr is not NULL it will be used as a template for + * the netlink message header, otherwise the header is left blank. + * + * @return Newly allocated netlink message or NULL + */ +struct nl_msg *nlmsg_inherit(struct nlmsghdr *hdr) +{ + struct nl_msg *nm; + + nm = nlmsg_alloc(); + if (nm && hdr) { + struct nlmsghdr *new = nm->nm_nlh; + + new->nlmsg_type = hdr->nlmsg_type; + new->nlmsg_flags = hdr->nlmsg_flags; + new->nlmsg_seq = hdr->nlmsg_seq; + new->nlmsg_pid = hdr->nlmsg_pid; + } + + return nm; +} + +/** + * Allocate a new netlink message + * @arg nlmsgtype Netlink message type + * @arg flags Message flags. + * + * @return Newly allocated netlink message or NULL. + */ +struct nl_msg *nlmsg_alloc_simple(int nlmsgtype, int flags) +{ + struct nl_msg *msg; + struct nlmsghdr nlh = { + .nlmsg_type = nlmsgtype, + .nlmsg_flags = flags, + }; + + msg = nlmsg_inherit(&nlh); + if (msg) + NL_DBG(2, "msg %p: Allocated new simple message\n", msg); + + return msg; +} + +/** + * Set the default maximum message payload size for allocated messages + * @arg max Size of payload in bytes. + */ +void nlmsg_set_default_size(size_t max) +{ + if (max < nlmsg_total_size(0)) + max = nlmsg_total_size(0); + + default_msg_size = max; +} + +/** + * Convert a netlink message received from a netlink socket to a nl_msg + * @arg hdr Netlink message received from netlink socket. + * + * Allocates a new netlink message and copies all of the data pointed to + * by \a hdr into the new message object. + * + * @return Newly allocated netlink message or NULL. + */ +struct nl_msg *nlmsg_convert(struct nlmsghdr *hdr) +{ + struct nl_msg *nm; + + nm = __nlmsg_alloc(NLMSG_ALIGN(hdr->nlmsg_len)); + if (!nm) + goto errout; + + memcpy(nm->nm_nlh, hdr, hdr->nlmsg_len); + + return nm; +errout: + nlmsg_free(nm); + return NULL; +} + +/** + * Reserve room for additional data in a netlink message + * @arg n netlink message + * @arg len length of additional data to reserve room for + * @arg pad number of bytes to align data to + * + * Reserves room for additional data at the tail of the an + * existing netlink message. Eventual padding required will + * be zeroed out. + * + * @return Pointer to start of additional data tailroom or NULL. + */ +void *nlmsg_reserve(struct nl_msg *n, size_t len, int pad) +{ + void *buf = n->nm_nlh; + size_t nlmsg_len = n->nm_nlh->nlmsg_len; + size_t tlen; + + tlen = pad ? ((len + (pad - 1)) & ~(pad - 1)) : len; + + if ((tlen + nlmsg_len) > n->nm_size) + return NULL; + + buf += nlmsg_len; + n->nm_nlh->nlmsg_len += tlen; + + if (tlen > len) + memset(buf + len, 0, tlen - len); + + NL_DBG(2, "msg %p: Reserved %zu bytes, pad=%d, nlmsg_len=%d\n", + n, len, pad, n->nm_nlh->nlmsg_len); + + return buf; +} + +/** + * Append data to tail of a netlink message + * @arg n netlink message + * @arg data data to add + * @arg len length of data + * @arg pad Number of bytes to align data to. + * + * Extends the netlink message as needed and appends the data of given + * length to the message. + * + * @return 0 on success or a negative error code + */ +int nlmsg_append(struct nl_msg *n, void *data, size_t len, int pad) +{ + void *tmp; + + tmp = nlmsg_reserve(n, len, pad); + if (tmp == NULL) + return -NLE_NOMEM; + + memcpy(tmp, data, len); + NL_DBG(2, "msg %p: Appended %zu bytes with padding %d\n", n, len, pad); + + return 0; +} + +/** + * Add a netlink message header to a netlink message + * @arg n netlink message + * @arg pid netlink process id or NL_AUTO_PID + * @arg seq sequence number of message or NL_AUTO_SEQ + * @arg type message type + * @arg payload length of message payload + * @arg flags message flags + * + * Adds or overwrites the netlink message header in an existing message + * object. If \a payload is greater-than zero additional room will be + * reserved, f.e. for family specific headers. It can be accesed via + * nlmsg_data(). + * + * @return A pointer to the netlink message header or NULL. + */ +struct nlmsghdr *nlmsg_put(struct nl_msg *n, uint32_t pid, uint32_t seq, + int type, int payload, int flags) +{ + struct nlmsghdr *nlh; + + if (n->nm_nlh->nlmsg_len < NLMSG_HDRLEN) + BUG(); + + nlh = (struct nlmsghdr *) n->nm_nlh; + nlh->nlmsg_type = type; + nlh->nlmsg_flags = flags; + nlh->nlmsg_pid = pid; + nlh->nlmsg_seq = seq; + + NL_DBG(2, "msg %p: Added netlink header type=%d, flags=%d, pid=%d, " + "seq=%d\n", n, type, flags, pid, seq); + + if (payload > 0 && + nlmsg_reserve(n, payload, NLMSG_ALIGNTO) == NULL) + return NULL; + + return nlh; +} + +/** + * Release a reference from an netlink message + * @arg msg message to release reference from + * + * Frees memory after the last reference has been released. + */ +void nlmsg_free(struct nl_msg *msg) +{ + if (!msg) + return; + + msg->nm_refcnt--; + NL_DBG(4, "Returned message reference %p, %d remaining\n", + msg, msg->nm_refcnt); + + if (msg->nm_refcnt < 0) + BUG(); + + if (msg->nm_refcnt <= 0) { + free(msg->nm_nlh); + free(msg); + NL_DBG(2, "msg %p: Freed\n", msg); + } +} + +/** @} */ + +/** + * @name Direct Parsing + * @{ + */ + +/** @cond SKIP */ +struct dp_xdata { + void (*cb)(struct nl_object *, void *); + void *arg; +}; +/** @endcond */ + +static int parse_cb(struct nl_object *obj, struct nl_parser_param *p) +{ + struct dp_xdata *x = p->pp_arg; + + x->cb(obj, x->arg); + return 0; +} + +int nl_msg_parse(struct nl_msg *msg, void (*cb)(struct nl_object *, void *), + void *arg) +{ + struct nl_cache_ops *ops; + struct nl_parser_param p = { + .pp_cb = parse_cb + }; + struct dp_xdata x = { + .cb = cb, + .arg = arg, + }; + + ops = nl_cache_ops_associate(nlmsg_get_proto(msg), + nlmsg_hdr(msg)->nlmsg_type); + if (ops == NULL) + return -NLE_MSGTYPE_NOSUPPORT; + p.pp_arg = &x; + + return nl_cache_parse(ops, NULL, nlmsg_hdr(msg), &p); +} + +/** @} */ diff --git a/package/libnl-tiny/src/nl.c b/package/libnl-tiny/src/nl.c new file mode 100644 index 0000000..99e9aeb --- /dev/null +++ b/package/libnl-tiny/src/nl.c @@ -0,0 +1,720 @@ +/* + * lib/nl.c Core Netlink Interface + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @defgroup core Core + * + * @details + * @par 1) Connecting the socket + * @code + * // Bind and connect the socket to a protocol, NETLINK_ROUTE in this example. + * nl_connect(sk, NETLINK_ROUTE); + * @endcode + * + * @par 2) Sending data + * @code + * // The most rudimentary method is to use nl_sendto() simply pushing + * // a piece of data to the other netlink peer. This method is not + * // recommended. + * const char buf[] = { 0x01, 0x02, 0x03, 0x04 }; + * nl_sendto(sk, buf, sizeof(buf)); + * + * // A more comfortable interface is nl_send() taking a pointer to + * // a netlink message. + * struct nl_msg *msg = my_msg_builder(); + * nl_send(sk, nlmsg_hdr(msg)); + * + * // nl_sendmsg() provides additional control over the sendmsg() message + * // header in order to allow more specific addressing of multiple peers etc. + * struct msghdr hdr = { ... }; + * nl_sendmsg(sk, nlmsg_hdr(msg), &hdr); + * + * // You're probably too lazy to fill out the netlink pid, sequence number + * // and message flags all the time. nl_send_auto_complete() automatically + * // extends your message header as needed with an appropriate sequence + * // number, the netlink pid stored in the netlink socket and the message + * // flags NLM_F_REQUEST and NLM_F_ACK (if not disabled in the socket) + * nl_send_auto_complete(sk, nlmsg_hdr(msg)); + * + * // Simple protocols don't require the complex message construction interface + * // and may favour nl_send_simple() to easly send a bunch of payload + * // encapsulated in a netlink message header. + * nl_send_simple(sk, MY_MSG_TYPE, 0, buf, sizeof(buf)); + * @endcode + * + * @par 3) Receiving data + * @code + * // nl_recv() receives a single message allocating a buffer for the message + * // content and gives back the pointer to you. + * struct sockaddr_nl peer; + * unsigned char *msg; + * nl_recv(sk, &peer, &msg); + * + * // nl_recvmsgs() receives a bunch of messages until the callback system + * // orders it to state, usually after receving a compolete multi part + * // message series. + * nl_recvmsgs(sk, my_callback_configuration); + * + * // nl_recvmsgs_default() acts just like nl_recvmsg() but uses the callback + * // configuration stored in the socket. + * nl_recvmsgs_default(sk); + * + * // In case you want to wait for the ACK to be recieved that you requested + * // with your latest message, you can call nl_wait_for_ack() + * nl_wait_for_ack(sk); + * @endcode + * + * @par 4) Closing + * @code + * // Close the socket first to release kernel memory + * nl_close(sk); + * @endcode + * + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/handlers.h> +#include <netlink/msg.h> +#include <netlink/attr.h> + +/** + * @name Connection Management + * @{ + */ + +/** + * Create and connect netlink socket. + * @arg sk Netlink socket. + * @arg protocol Netlink protocol to use. + * + * Creates a netlink socket using the specified protocol, binds the socket + * and issues a connection attempt. + * + * @return 0 on success or a negative error code. + */ +int nl_connect(struct nl_sock *sk, int protocol) +{ + int err; + socklen_t addrlen; + + sk->s_fd = socket(AF_NETLINK, SOCK_RAW, protocol); + if (sk->s_fd < 0) { + err = -nl_syserr2nlerr(errno); + goto errout; + } + + if (!(sk->s_flags & NL_SOCK_BUFSIZE_SET)) { + err = nl_socket_set_buffer_size(sk, 0, 0); + if (err < 0) + goto errout; + } + + err = bind(sk->s_fd, (struct sockaddr*) &sk->s_local, + sizeof(sk->s_local)); + if (err < 0) { + err = -nl_syserr2nlerr(errno); + goto errout; + } + + addrlen = sizeof(sk->s_local); + err = getsockname(sk->s_fd, (struct sockaddr *) &sk->s_local, + &addrlen); + if (err < 0) { + err = -nl_syserr2nlerr(errno); + goto errout; + } + + if (addrlen != sizeof(sk->s_local)) { + err = -NLE_NOADDR; + goto errout; + } + + if (sk->s_local.nl_family != AF_NETLINK) { + err = -NLE_AF_NOSUPPORT; + goto errout; + } + + sk->s_proto = protocol; + + return 0; +errout: + close(sk->s_fd); + sk->s_fd = -1; + + return err; +} + +/** + * Close/Disconnect netlink socket. + * @arg sk Netlink socket. + */ +void nl_close(struct nl_sock *sk) +{ + if (sk->s_fd >= 0) { + close(sk->s_fd); + sk->s_fd = -1; + } + + sk->s_proto = 0; +} + +/** @} */ + +/** + * @name Send + * @{ + */ + +/** + * Send raw data over netlink socket. + * @arg sk Netlink socket. + * @arg buf Data buffer. + * @arg size Size of data buffer. + * @return Number of characters written on success or a negative error code. + */ +int nl_sendto(struct nl_sock *sk, void *buf, size_t size) +{ + int ret; + + ret = sendto(sk->s_fd, buf, size, 0, (struct sockaddr *) + &sk->s_peer, sizeof(sk->s_peer)); + if (ret < 0) + return -nl_syserr2nlerr(errno); + + return ret; +} + +/** + * Send netlink message with control over sendmsg() message header. + * @arg sk Netlink socket. + * @arg msg Netlink message to be sent. + * @arg hdr Sendmsg() message header. + * @return Number of characters sent on sucess or a negative error code. + */ +int nl_sendmsg(struct nl_sock *sk, struct nl_msg *msg, struct msghdr *hdr) +{ + struct nl_cb *cb; + int ret; + + struct iovec iov = { + .iov_base = (void *) nlmsg_hdr(msg), + .iov_len = nlmsg_hdr(msg)->nlmsg_len, + }; + + hdr->msg_iov = &iov; + hdr->msg_iovlen = 1; + + nlmsg_set_src(msg, &sk->s_local); + + cb = sk->s_cb; + if (cb->cb_set[NL_CB_MSG_OUT]) + if (nl_cb_call(cb, NL_CB_MSG_OUT, msg) != NL_OK) + return 0; + + ret = sendmsg(sk->s_fd, hdr, 0); + if (ret < 0) + return -nl_syserr2nlerr(errno); + + return ret; +} + + +/** + * Send netlink message. + * @arg sk Netlink socket. + * @arg msg Netlink message to be sent. + * @see nl_sendmsg() + * @return Number of characters sent on success or a negative error code. + */ +int nl_send(struct nl_sock *sk, struct nl_msg *msg) +{ + struct sockaddr_nl *dst; + struct ucred *creds; + + struct msghdr hdr = { + .msg_name = (void *) &sk->s_peer, + .msg_namelen = sizeof(struct sockaddr_nl), + }; + + /* Overwrite destination if specified in the message itself, defaults + * to the peer address of the socket. + */ + dst = nlmsg_get_dst(msg); + if (dst->nl_family == AF_NETLINK) + hdr.msg_name = dst; + + /* Add credentials if present. */ + creds = nlmsg_get_creds(msg); + if (creds != NULL) { + char buf[CMSG_SPACE(sizeof(struct ucred))]; + struct cmsghdr *cmsg; + + hdr.msg_control = buf; + hdr.msg_controllen = sizeof(buf); + + cmsg = CMSG_FIRSTHDR(&hdr); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_CREDENTIALS; + cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); + memcpy(CMSG_DATA(cmsg), creds, sizeof(struct ucred)); + } + + return nl_sendmsg(sk, msg, &hdr); +} + +/** + * Send netlink message and check & extend header values as needed. + * @arg sk Netlink socket. + * @arg msg Netlink message to be sent. + * + * Checks the netlink message \c nlh for completness and extends it + * as required before sending it out. Checked fields include pid, + * sequence nr, and flags. + * + * @see nl_send() + * @return Number of characters sent or a negative error code. + */ +int nl_send_auto_complete(struct nl_sock *sk, struct nl_msg *msg) +{ + struct nlmsghdr *nlh; + struct nl_cb *cb = sk->s_cb; + + nlh = nlmsg_hdr(msg); + if (nlh->nlmsg_pid == 0) + nlh->nlmsg_pid = sk->s_local.nl_pid; + + if (nlh->nlmsg_seq == 0) + nlh->nlmsg_seq = sk->s_seq_next++; + + if (msg->nm_protocol == -1) + msg->nm_protocol = sk->s_proto; + + nlh->nlmsg_flags |= NLM_F_REQUEST; + + if (!(sk->s_flags & NL_NO_AUTO_ACK)) + nlh->nlmsg_flags |= NLM_F_ACK; + + if (cb->cb_send_ow) + return cb->cb_send_ow(sk, msg); + else + return nl_send(sk, msg); +} + +/** + * Send simple netlink message using nl_send_auto_complete() + * @arg sk Netlink socket. + * @arg type Netlink message type. + * @arg flags Netlink message flags. + * @arg buf Data buffer. + * @arg size Size of data buffer. + * + * Builds a netlink message with the specified type and flags and + * appends the specified data as payload to the message. + * + * @see nl_send_auto_complete() + * @return Number of characters sent on success or a negative error code. + */ +int nl_send_simple(struct nl_sock *sk, int type, int flags, void *buf, + size_t size) +{ + int err; + struct nl_msg *msg; + + msg = nlmsg_alloc_simple(type, flags); + if (!msg) + return -NLE_NOMEM; + + if (buf && size) { + err = nlmsg_append(msg, buf, size, NLMSG_ALIGNTO); + if (err < 0) + goto errout; + } + + + err = nl_send_auto_complete(sk, msg); +errout: + nlmsg_free(msg); + + return err; +} + +/** @} */ + +/** + * @name Receive + * @{ + */ + +/** + * Receive data from netlink socket + * @arg sk Netlink socket. + * @arg nla Destination pointer for peer's netlink address. + * @arg buf Destination pointer for message content. + * @arg creds Destination pointer for credentials. + * + * Receives a netlink message, allocates a buffer in \c *buf and + * stores the message content. The peer's netlink address is stored + * in \c *nla. The caller is responsible for freeing the buffer allocated + * in \c *buf if a positive value is returned. Interruped system calls + * are handled by repeating the read. The input buffer size is determined + * by peeking before the actual read is done. + * + * A non-blocking sockets causes the function to return immediately with + * a return value of 0 if no data is available. + * + * @return Number of octets read, 0 on EOF or a negative error code. + */ +int nl_recv(struct nl_sock *sk, struct sockaddr_nl *nla, + unsigned char **buf, struct ucred **creds) +{ + int n; + int flags = 0; + static int page_size = 0; + struct iovec iov; + struct msghdr msg = { + .msg_name = (void *) nla, + .msg_namelen = sizeof(struct sockaddr_nl), + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = NULL, + .msg_controllen = 0, + .msg_flags = 0, + }; + struct cmsghdr *cmsg; + + if (sk->s_flags & NL_MSG_PEEK) + flags |= MSG_PEEK; + + if (page_size == 0) + page_size = getpagesize(); + + iov.iov_len = page_size; + iov.iov_base = *buf = malloc(iov.iov_len); + + if (sk->s_flags & NL_SOCK_PASSCRED) { + msg.msg_controllen = CMSG_SPACE(sizeof(struct ucred)); + msg.msg_control = calloc(1, msg.msg_controllen); + } +retry: + + n = recvmsg(sk->s_fd, &msg, flags); + if (!n) + goto abort; + else if (n < 0) { + if (errno == EINTR) { + NL_DBG(3, "recvmsg() returned EINTR, retrying\n"); + goto retry; + } else if (errno == EAGAIN) { + NL_DBG(3, "recvmsg() returned EAGAIN, aborting\n"); + goto abort; + } else { + free(msg.msg_control); + free(*buf); + return -nl_syserr2nlerr(errno); + } + } + + if (iov.iov_len < n || + msg.msg_flags & MSG_TRUNC) { + /* Provided buffer is not long enough, enlarge it + * and try again. */ + iov.iov_len *= 2; + iov.iov_base = *buf = realloc(*buf, iov.iov_len); + goto retry; + } else if (msg.msg_flags & MSG_CTRUNC) { + msg.msg_controllen *= 2; + msg.msg_control = realloc(msg.msg_control, msg.msg_controllen); + goto retry; + } else if (flags != 0) { + /* Buffer is big enough, do the actual reading */ + flags = 0; + goto retry; + } + + if (msg.msg_namelen != sizeof(struct sockaddr_nl)) { + free(msg.msg_control); + free(*buf); + return -NLE_NOADDR; + } + + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_CREDENTIALS) { + *creds = calloc(1, sizeof(struct ucred)); + memcpy(*creds, CMSG_DATA(cmsg), sizeof(struct ucred)); + break; + } + } + + free(msg.msg_control); + return n; + +abort: + free(msg.msg_control); + free(*buf); + return 0; +} + +#define NL_CB_CALL(cb, type, msg) \ +do { \ + err = nl_cb_call(cb, type, msg); \ + switch (err) { \ + case NL_OK: \ + err = 0; \ + break; \ + case NL_SKIP: \ + goto skip; \ + case NL_STOP: \ + goto stop; \ + default: \ + goto out; \ + } \ +} while (0) + +static int recvmsgs(struct nl_sock *sk, struct nl_cb *cb) +{ + int n, err = 0, multipart = 0; + unsigned char *buf = NULL; + struct nlmsghdr *hdr; + struct sockaddr_nl nla = {0}; + struct nl_msg *msg = NULL; + struct ucred *creds = NULL; + +continue_reading: + NL_DBG(3, "Attempting to read from %p\n", sk); + if (cb->cb_recv_ow) + n = cb->cb_recv_ow(sk, &nla, &buf, &creds); + else + n = nl_recv(sk, &nla, &buf, &creds); + + if (n <= 0) + return n; + + NL_DBG(3, "recvmsgs(%p): Read %d bytes\n", sk, n); + + hdr = (struct nlmsghdr *) buf; + while (nlmsg_ok(hdr, n)) { + NL_DBG(3, "recgmsgs(%p): Processing valid message...\n", sk); + + nlmsg_free(msg); + msg = nlmsg_convert(hdr); + if (!msg) { + err = -NLE_NOMEM; + goto out; + } + + nlmsg_set_proto(msg, sk->s_proto); + nlmsg_set_src(msg, &nla); + if (creds) + nlmsg_set_creds(msg, creds); + + /* Raw callback is the first, it gives the most control + * to the user and he can do his very own parsing. */ + if (cb->cb_set[NL_CB_MSG_IN]) + NL_CB_CALL(cb, NL_CB_MSG_IN, msg); + + /* Sequence number checking. The check may be done by + * the user, otherwise a very simple check is applied + * enforcing strict ordering */ + if (cb->cb_set[NL_CB_SEQ_CHECK]) + NL_CB_CALL(cb, NL_CB_SEQ_CHECK, msg); + else if (hdr->nlmsg_seq != sk->s_seq_expect) { + if (cb->cb_set[NL_CB_INVALID]) + NL_CB_CALL(cb, NL_CB_INVALID, msg); + else { + err = -NLE_SEQ_MISMATCH; + goto out; + } + } + + if (hdr->nlmsg_type == NLMSG_DONE || + hdr->nlmsg_type == NLMSG_ERROR || + hdr->nlmsg_type == NLMSG_NOOP || + hdr->nlmsg_type == NLMSG_OVERRUN) { + /* We can't check for !NLM_F_MULTI since some netlink + * users in the kernel are broken. */ + sk->s_seq_expect++; + NL_DBG(3, "recvmsgs(%p): Increased expected " \ + "sequence number to %d\n", + sk, sk->s_seq_expect); + } + + if (hdr->nlmsg_flags & NLM_F_MULTI) + multipart = 1; + + /* Other side wishes to see an ack for this message */ + if (hdr->nlmsg_flags & NLM_F_ACK) { + if (cb->cb_set[NL_CB_SEND_ACK]) + NL_CB_CALL(cb, NL_CB_SEND_ACK, msg); + else { + /* FIXME: implement */ + } + } + + /* messages terminates a multpart message, this is + * usually the end of a message and therefore we slip + * out of the loop by default. the user may overrule + * this action by skipping this packet. */ + if (hdr->nlmsg_type == NLMSG_DONE) { + multipart = 0; + if (cb->cb_set[NL_CB_FINISH]) + NL_CB_CALL(cb, NL_CB_FINISH, msg); + } + + /* Message to be ignored, the default action is to + * skip this message if no callback is specified. The + * user may overrule this action by returning + * NL_PROCEED. */ + else if (hdr->nlmsg_type == NLMSG_NOOP) { + if (cb->cb_set[NL_CB_SKIPPED]) + NL_CB_CALL(cb, NL_CB_SKIPPED, msg); + else + goto skip; + } + + /* Data got lost, report back to user. The default action is to + * quit parsing. The user may overrule this action by retuning + * NL_SKIP or NL_PROCEED (dangerous) */ + else if (hdr->nlmsg_type == NLMSG_OVERRUN) { + if (cb->cb_set[NL_CB_OVERRUN]) + NL_CB_CALL(cb, NL_CB_OVERRUN, msg); + else { + err = -NLE_MSG_OVERFLOW; + goto out; + } + } + + /* Message carries a nlmsgerr */ + else if (hdr->nlmsg_type == NLMSG_ERROR) { + struct nlmsgerr *e = nlmsg_data(hdr); + + if (hdr->nlmsg_len < nlmsg_msg_size(sizeof(*e))) { + /* Truncated error message, the default action + * is to stop parsing. The user may overrule + * this action by returning NL_SKIP or + * NL_PROCEED (dangerous) */ + if (cb->cb_set[NL_CB_INVALID]) + NL_CB_CALL(cb, NL_CB_INVALID, msg); + else { + err = -NLE_MSG_TRUNC; + goto out; + } + } else if (e->error) { + /* Error message reported back from kernel. */ + if (cb->cb_err) { + err = cb->cb_err(&nla, e, + cb->cb_err_arg); + if (err < 0) + goto out; + else if (err == NL_SKIP) + goto skip; + else if (err == NL_STOP) { + err = -nl_syserr2nlerr(e->error); + goto out; + } + } else { + err = -nl_syserr2nlerr(e->error); + goto out; + } + } else if (cb->cb_set[NL_CB_ACK]) + NL_CB_CALL(cb, NL_CB_ACK, msg); + } else { + /* Valid message (not checking for MULTIPART bit to + * get along with broken kernels. NL_SKIP has no + * effect on this. */ + if (cb->cb_set[NL_CB_VALID]) + NL_CB_CALL(cb, NL_CB_VALID, msg); + } +skip: + err = 0; + hdr = nlmsg_next(hdr, &n); + } + + nlmsg_free(msg); + free(buf); + free(creds); + buf = NULL; + msg = NULL; + creds = NULL; + + if (multipart) { + /* Multipart message not yet complete, continue reading */ + goto continue_reading; + } +stop: + err = 0; +out: + nlmsg_free(msg); + free(buf); + free(creds); + + return err; +} + +/** + * Receive a set of messages from a netlink socket. + * @arg sk Netlink socket. + * @arg cb set of callbacks to control behaviour. + * + * Repeatedly calls nl_recv() or the respective replacement if provided + * by the application (see nl_cb_overwrite_recv()) and parses the + * received data as netlink messages. Stops reading if one of the + * callbacks returns NL_STOP or nl_recv returns either 0 or a negative error code. + * + * A non-blocking sockets causes the function to return immediately if + * no data is available. + * + * @return 0 on success or a negative error code from nl_recv(). + */ +int nl_recvmsgs(struct nl_sock *sk, struct nl_cb *cb) +{ + if (cb->cb_recvmsgs_ow) + return cb->cb_recvmsgs_ow(sk, cb); + else + return recvmsgs(sk, cb); +} + + +static int ack_wait_handler(struct nl_msg *msg, void *arg) +{ + return NL_STOP; +} + +/** + * Wait for ACK. + * @arg sk Netlink socket. + * @pre The netlink socket must be in blocking state. + * + * Waits until an ACK is received for the latest not yet acknowledged + * netlink message. + */ +int nl_wait_for_ack(struct nl_sock *sk) +{ + int err; + struct nl_cb *cb; + + cb = nl_cb_clone(sk->s_cb); + if (cb == NULL) + return -NLE_NOMEM; + + nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_wait_handler, NULL); + err = nl_recvmsgs(sk, cb); + nl_cb_put(cb); + + return err; +} + +/** @} */ + +/** @} */ diff --git a/package/libnl-tiny/src/object.c b/package/libnl-tiny/src/object.c new file mode 100644 index 0000000..1b18d9a --- /dev/null +++ b/package/libnl-tiny/src/object.c @@ -0,0 +1,309 @@ +/* + * lib/object.c Generic Cacheable Object + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup cache + * @defgroup object Object + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/cache.h> +#include <netlink/object.h> +#include <netlink/utils.h> + +static inline struct nl_object_ops *obj_ops(struct nl_object *obj) +{ + if (!obj->ce_ops) + BUG(); + + return obj->ce_ops; +} + +/** + * @name Object Creation/Deletion + * @{ + */ + +/** + * Allocate a new object of kind specified by the operations handle + * @arg ops cache operations handle + * @return The new object or NULL + */ +struct nl_object *nl_object_alloc(struct nl_object_ops *ops) +{ + struct nl_object *new; + + if (ops->oo_size < sizeof(*new)) + BUG(); + + new = calloc(1, ops->oo_size); + if (!new) + return NULL; + + new->ce_refcnt = 1; + nl_init_list_head(&new->ce_list); + + new->ce_ops = ops; + if (ops->oo_constructor) + ops->oo_constructor(new); + + NL_DBG(4, "Allocated new object %p\n", new); + + return new; +} + +#ifdef disabled +/** + * Allocate a new object of kind specified by the name + * @arg kind name of object type + * @return The new object or nULL + */ +int nl_object_alloc_name(const char *kind, struct nl_object **result) +{ + struct nl_cache_ops *ops; + + ops = nl_cache_ops_lookup(kind); + if (!ops) + return -NLE_OPNOTSUPP; + + if (!(*result = nl_object_alloc(ops->co_obj_ops))) + return -NLE_NOMEM; + + return 0; +} +#endif + +struct nl_derived_object { + NLHDR_COMMON + char data; +}; + +/** + * Allocate a new object and copy all data from an existing object + * @arg obj object to inherite data from + * @return The new object or NULL. + */ +struct nl_object *nl_object_clone(struct nl_object *obj) +{ + struct nl_object *new; + struct nl_object_ops *ops = obj_ops(obj); + int doff = offsetof(struct nl_derived_object, data); + int size; + + new = nl_object_alloc(ops); + if (!new) + return NULL; + + size = ops->oo_size - doff; + if (size < 0) + BUG(); + + new->ce_ops = obj->ce_ops; + new->ce_msgtype = obj->ce_msgtype; + + if (size) + memcpy((void *)new + doff, (void *)obj + doff, size); + + if (ops->oo_clone) { + if (ops->oo_clone(new, obj) < 0) { + nl_object_free(new); + return NULL; + } + } else if (size && ops->oo_free_data) + BUG(); + + return new; +} + +/** + * Free a cacheable object + * @arg obj object to free + * + * @return 0 or a negative error code. + */ +void nl_object_free(struct nl_object *obj) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (obj->ce_refcnt > 0) + NL_DBG(1, "Warning: Freeing object in use...\n"); + + if (obj->ce_cache) + nl_cache_remove(obj); + + if (ops->oo_free_data) + ops->oo_free_data(obj); + + free(obj); + + NL_DBG(4, "Freed object %p\n", obj); +} + +/** @} */ + +/** + * @name Reference Management + * @{ + */ + +/** + * Acquire a reference on a object + * @arg obj object to acquire reference from + */ +void nl_object_get(struct nl_object *obj) +{ + obj->ce_refcnt++; + NL_DBG(4, "New reference to object %p, total %d\n", + obj, obj->ce_refcnt); +} + +/** + * Release a reference from an object + * @arg obj object to release reference from + */ +void nl_object_put(struct nl_object *obj) +{ + if (!obj) + return; + + obj->ce_refcnt--; + NL_DBG(4, "Returned object reference %p, %d remaining\n", + obj, obj->ce_refcnt); + + if (obj->ce_refcnt < 0) + BUG(); + + if (obj->ce_refcnt <= 0) + nl_object_free(obj); +} + +/** @} */ + +/** + * @name Utillities + * @{ + */ + +#ifdef disabled +/** + * Dump this object according to the specified parameters + * @arg obj object to dump + * @arg params dumping parameters + */ +void nl_object_dump(struct nl_object *obj, struct nl_dump_params *params) +{ + dump_from_ops(obj, params); +} + +/** + * Check if the identifiers of two objects are identical + * @arg a an object + * @arg b another object of same type + * + * @return true if both objects have equal identifiers, otherwise false. + */ +int nl_object_identical(struct nl_object *a, struct nl_object *b) +{ + struct nl_object_ops *ops = obj_ops(a); + int req_attrs; + + /* Both objects must be of same type */ + if (ops != obj_ops(b)) + return 0; + + req_attrs = ops->oo_id_attrs; + + /* Both objects must provide all required attributes to uniquely + * identify an object */ + if ((a->ce_mask & req_attrs) != req_attrs || + (b->ce_mask & req_attrs) != req_attrs) + return 0; + + /* Can't judge unless we can compare */ + if (ops->oo_compare == NULL) + return 0; + + return !(ops->oo_compare(a, b, req_attrs, 0)); +} +#endif + +/** + * Compute bitmask representing difference in attribute values + * @arg a an object + * @arg b another object of same type + * + * The bitmask returned is specific to an object type, each bit set represents + * an attribute which mismatches in either of the two objects. Unavailability + * of an attribute in one object and presence in the other is regarded a + * mismatch as well. + * + * @return Bitmask describing differences or 0 if they are completely identical. + */ +uint32_t nl_object_diff(struct nl_object *a, struct nl_object *b) +{ + struct nl_object_ops *ops = obj_ops(a); + + if (ops != obj_ops(b) || ops->oo_compare == NULL) + return UINT_MAX; + + return ops->oo_compare(a, b, ~0, 0); +} + +/** + * Match a filter against an object + * @arg obj object to check + * @arg filter object of same type acting as filter + * + * @return 1 if the object matches the filter or 0 + * if no filter procedure is available or if the + * filter does not match. + */ +int nl_object_match_filter(struct nl_object *obj, struct nl_object *filter) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (ops != obj_ops(filter) || ops->oo_compare == NULL) + return 0; + + return !(ops->oo_compare(obj, filter, filter->ce_mask, + LOOSE_COMPARISON)); +} + +/** + * Convert bitmask of attributes to a character string + * @arg obj object of same type as attribute bitmask + * @arg attrs bitmask of attribute types + * @arg buf destination buffer + * @arg len length of destination buffer + * + * Converts the bitmask of attribute types into a list of attribute + * names separated by comas. + * + * @return destination buffer. + */ +char *nl_object_attrs2str(struct nl_object *obj, uint32_t attrs, + char *buf, size_t len) +{ + struct nl_object_ops *ops = obj_ops(obj); + + if (ops->oo_attrs2str != NULL) + return ops->oo_attrs2str(attrs, buf, len); + else { + memset(buf, 0, len); + return buf; + } +} + +/** @} */ + +/** @} */ diff --git a/package/libnl-tiny/src/socket.c b/package/libnl-tiny/src/socket.c new file mode 100644 index 0000000..6fe56fd --- /dev/null +++ b/package/libnl-tiny/src/socket.c @@ -0,0 +1,406 @@ +/* + * lib/socket.c Netlink Socket + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup core + * @defgroup socket Socket + * @{ + */ + +#include <netlink-local.h> +#include <netlink/netlink.h> +#include <netlink/utils.h> +#include <netlink/handlers.h> +#include <netlink/msg.h> +#include <netlink/attr.h> + +static uint32_t used_ports_map[32]; + +static uint32_t generate_local_port(void) +{ + int i, n; + uint32_t pid = getpid() & 0x3FFFFF; + + for (i = 0; i < 32; i++) { + if (used_ports_map[i] == 0xFFFFFFFF) + continue; + + for (n = 0; n < 32; n++) { + if (1UL & (used_ports_map[i] >> n)) + continue; + + used_ports_map[i] |= (1UL << n); + n += (i * 32); + + /* PID_MAX_LIMIT is currently at 2^22, leaving 10 bit + * to, i.e. 1024 unique ports per application. */ + return pid + (n << 22); + + } + } + + /* Out of sockets in our own PID namespace, what to do? FIXME */ + return UINT_MAX; +} + +static void release_local_port(uint32_t port) +{ + int nr; + + if (port == UINT_MAX) + return; + + nr = port >> 22; + used_ports_map[nr / 32] &= ~((nr % 32) + 1); +} + +/** + * @name Allocation + * @{ + */ + +static struct nl_sock *__alloc_socket(struct nl_cb *cb) +{ + struct nl_sock *sk; + + sk = calloc(1, sizeof(*sk)); + if (!sk) + return NULL; + + sk->s_fd = -1; + sk->s_cb = cb; + sk->s_local.nl_family = AF_NETLINK; + sk->s_peer.nl_family = AF_NETLINK; + sk->s_seq_expect = sk->s_seq_next = time(0); + sk->s_local.nl_pid = generate_local_port(); + if (sk->s_local.nl_pid == UINT_MAX) { + nl_socket_free(sk); + return NULL; + } + + return sk; +} + +/** + * Allocate new netlink socket + * + * @return Newly allocated netlink socket or NULL. + */ +struct nl_sock *nl_socket_alloc(void) +{ + struct nl_cb *cb; + + cb = nl_cb_alloc(NL_CB_DEFAULT); + if (!cb) + return NULL; + + return __alloc_socket(cb); +} + +/** + * Allocate new socket with custom callbacks + * @arg cb Callback handler + * + * The reference to the callback handler is taken into account + * automatically, it is released again upon calling nl_socket_free(). + * + *@return Newly allocted socket handle or NULL. + */ +struct nl_sock *nl_socket_alloc_cb(struct nl_cb *cb) +{ + if (cb == NULL) + BUG(); + + return __alloc_socket(nl_cb_get(cb)); +} + +/** + * Free a netlink socket. + * @arg sk Netlink socket. + */ +void nl_socket_free(struct nl_sock *sk) +{ + if (!sk) + return; + + if (sk->s_fd >= 0) + close(sk->s_fd); + + if (!(sk->s_flags & NL_OWN_PORT)) + release_local_port(sk->s_local.nl_pid); + + nl_cb_put(sk->s_cb); + free(sk); +} + +/** @} */ + +/** + * @name Sequence Numbers + * @{ + */ + +static int noop_seq_check(struct nl_msg *msg, void *arg) +{ + return NL_OK; +} + + +/** + * Disable sequence number checking. + * @arg sk Netlink socket. + * + * Disables checking of sequence numbers on the netlink socket This is + * required to allow messages to be processed which were not requested by + * a preceding request message, e.g. netlink events. + * + * @note This function modifies the NL_CB_SEQ_CHECK configuration in + * the callback handle associated with the socket. + */ +void nl_socket_disable_seq_check(struct nl_sock *sk) +{ + nl_cb_set(sk->s_cb, NL_CB_SEQ_CHECK, + NL_CB_CUSTOM, noop_seq_check, NULL); +} + +/** @} */ + +/** + * Set local port of socket + * @arg sk Netlink socket. + * @arg port Local port identifier + * + * Assigns a local port identifier to the socket. If port is 0 + * a unique port identifier will be generated automatically. + */ +void nl_socket_set_local_port(struct nl_sock *sk, uint32_t port) +{ + if (port == 0) { + port = generate_local_port(); + sk->s_flags &= ~NL_OWN_PORT; + } else { + if (!(sk->s_flags & NL_OWN_PORT)) + release_local_port(sk->s_local.nl_pid); + sk->s_flags |= NL_OWN_PORT; + } + + sk->s_local.nl_pid = port; +} + +/** @} */ + +/** + * @name Group Subscriptions + * @{ + */ + +/** + * Join groups + * @arg sk Netlink socket + * @arg group Group identifier + * + * Joins the specified groups using the modern socket option which + * is available since kernel version 2.6.14. It allows joining an + * almost arbitary number of groups without limitation. The list + * of groups has to be terminated by 0 (%NFNLGRP_NONE). + * + * Make sure to use the correct group definitions as the older + * bitmask definitions for nl_join_groups() are likely to still + * be present for backward compatibility reasons. + * + * @return 0 on sucess or a negative error code. + */ +int nl_socket_add_memberships(struct nl_sock *sk, int group, ...) +{ + int err; + va_list ap; + + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + va_start(ap, group); + + while (group != 0) { + if (group < 0) + return -NLE_INVAL; + + err = setsockopt(sk->s_fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, + &group, sizeof(group)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + group = va_arg(ap, int); + } + + va_end(ap); + + return 0; +} + +/** + * Leave groups + * @arg sk Netlink socket + * @arg group Group identifier + * + * Leaves the specified groups using the modern socket option + * which is available since kernel version 2.6.14. The list of groups + * has to terminated by 0 (%NFNLGRP_NONE). + * + * @see nl_socket_add_membership + * @return 0 on success or a negative error code. + */ +int nl_socket_drop_memberships(struct nl_sock *sk, int group, ...) +{ + int err; + va_list ap; + + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + va_start(ap, group); + + while (group != 0) { + if (group < 0) + return -NLE_INVAL; + + err = setsockopt(sk->s_fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP, + &group, sizeof(group)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + group = va_arg(ap, int); + } + + va_end(ap); + + return 0; +} + + +/** @} */ + +/** + * Set file descriptor of socket to non-blocking state + * @arg sk Netlink socket. + * + * @return 0 on success or a negative error code. + */ +int nl_socket_set_nonblocking(struct nl_sock *sk) +{ + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + if (fcntl(sk->s_fd, F_SETFL, O_NONBLOCK) < 0) + return -nl_syserr2nlerr(errno); + + return 0; +} + +/** @} */ + +/** + * @name Utilities + * @{ + */ + +/** + * Set socket buffer size of netlink socket. + * @arg sk Netlink socket. + * @arg rxbuf New receive socket buffer size in bytes. + * @arg txbuf New transmit socket buffer size in bytes. + * + * Sets the socket buffer size of a netlink socket to the specified + * values \c rxbuf and \c txbuf. Providing a value of \c 0 assumes a + * good default value. + * + * @note It is not required to call this function prior to nl_connect(). + * @return 0 on sucess or a negative error code. + */ +int nl_socket_set_buffer_size(struct nl_sock *sk, int rxbuf, int txbuf) +{ + int err; + + if (rxbuf <= 0) + rxbuf = 32768; + + if (txbuf <= 0) + txbuf = 32768; + + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + err = setsockopt(sk->s_fd, SOL_SOCKET, SO_SNDBUF, + &txbuf, sizeof(txbuf)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + err = setsockopt(sk->s_fd, SOL_SOCKET, SO_RCVBUF, + &rxbuf, sizeof(rxbuf)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + sk->s_flags |= NL_SOCK_BUFSIZE_SET; + + return 0; +} + +/** + * Enable/disable credential passing on netlink socket. + * @arg sk Netlink socket. + * @arg state New state (0 - disabled, 1 - enabled) + * + * @return 0 on success or a negative error code + */ +int nl_socket_set_passcred(struct nl_sock *sk, int state) +{ + int err; + + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + err = setsockopt(sk->s_fd, SOL_SOCKET, SO_PASSCRED, + &state, sizeof(state)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + if (state) + sk->s_flags |= NL_SOCK_PASSCRED; + else + sk->s_flags &= ~NL_SOCK_PASSCRED; + + return 0; +} + +/** + * Enable/disable receival of additional packet information + * @arg sk Netlink socket. + * @arg state New state (0 - disabled, 1 - enabled) + * + * @return 0 on success or a negative error code + */ +int nl_socket_recv_pktinfo(struct nl_sock *sk, int state) +{ + int err; + + if (sk->s_fd == -1) + return -NLE_BAD_SOCK; + + err = setsockopt(sk->s_fd, SOL_NETLINK, NETLINK_PKTINFO, + &state, sizeof(state)); + if (err < 0) + return -nl_syserr2nlerr(errno); + + return 0; +} + +/** @} */ + +/** @} */ |