diff options
Diffstat (limited to 'target')
25 files changed, 6 insertions, 7049 deletions
diff --git a/target/linux/generic-2.6/config-2.6.21 b/target/linux/generic-2.6/config-2.6.21 index d2f8b03..ca9d839 100644 --- a/target/linux/generic-2.6/config-2.6.21 +++ b/target/linux/generic-2.6/config-2.6.21 @@ -719,10 +719,8 @@ CONFIG_NETFILTER_XT_MATCH_LAYER7=m # CONFIG_NETFILTER_XT_MATCH_STATISTIC is not set CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=y -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m diff --git a/target/linux/generic-2.6/config-2.6.23 b/target/linux/generic-2.6/config-2.6.23 index 74d37d8..64f0e1d 100644 --- a/target/linux/generic-2.6/config-2.6.23 +++ b/target/linux/generic-2.6/config-2.6.23 @@ -788,16 +788,13 @@ CONFIG_NETFILTER_XT_MATCH_STATE=m CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TRACE=m # CONFIG_NETPOLL is not set diff --git a/target/linux/generic-2.6/config-2.6.24 b/target/linux/generic-2.6/config-2.6.24 index 0ccfd54..852a439 100644 --- a/target/linux/generic-2.6/config-2.6.24 +++ b/target/linux/generic-2.6/config-2.6.24 @@ -812,16 +812,13 @@ CONFIG_NETFILTER_XT_MATCH_STATE=m CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TRACE=m # CONFIG_NETPOLL is not set diff --git a/target/linux/generic-2.6/config-2.6.25 b/target/linux/generic-2.6/config-2.6.25 index 50363be..b2f8b4b 100644 --- a/target/linux/generic-2.6/config-2.6.25 +++ b/target/linux/generic-2.6/config-2.6.25 @@ -833,17 +833,14 @@ CONFIG_NETFILTER_XT_MATCH_STATE=m CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m CONFIG_NETFILTER_XT_TARGET_RATEEST=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP=m CONFIG_NETFILTER_XT_TARGET_TRACE=m diff --git a/target/linux/generic-2.6/config-2.6.26 b/target/linux/generic-2.6/config-2.6.26 index 092dc00..1558354 100644 --- a/target/linux/generic-2.6/config-2.6.26 +++ b/target/linux/generic-2.6/config-2.6.26 @@ -861,17 +861,14 @@ CONFIG_NETFILTER_XT_MATCH_STATE=m CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m CONFIG_NETFILTER_XT_TARGET_RATEEST=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP=m CONFIG_NETFILTER_XT_TARGET_TRACE=m diff --git a/target/linux/generic-2.6/config-2.6.27 b/target/linux/generic-2.6/config-2.6.27 index 70afe0e..9f8aa97 100644 --- a/target/linux/generic-2.6/config-2.6.27 +++ b/target/linux/generic-2.6/config-2.6.27 @@ -912,17 +912,14 @@ CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_TIME=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m CONFIG_NETFILTER_XT_TARGET_RATEEST=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP=m CONFIG_NETFILTER_XT_TARGET_TRACE=m diff --git a/target/linux/generic-2.6/config-2.6.28 b/target/linux/generic-2.6/config-2.6.28 index 834e009..6e23b9a 100644 --- a/target/linux/generic-2.6/config-2.6.28 +++ b/target/linux/generic-2.6/config-2.6.28 @@ -954,17 +954,14 @@ CONFIG_NETFILTER_XT_MATCH_STRING=m CONFIG_NETFILTER_XT_MATCH_TCPMSS=m CONFIG_NETFILTER_XT_MATCH_TIME=m CONFIG_NETFILTER_XT_MATCH_U32=m -CONFIG_NETFILTER_XT_TARGET_CHAOS=m CONFIG_NETFILTER_XT_TARGET_CLASSIFY=m CONFIG_NETFILTER_XT_TARGET_CONNMARK=m -CONFIG_NETFILTER_XT_TARGET_DELUDE=m CONFIG_NETFILTER_XT_TARGET_DSCP=m CONFIG_NETFILTER_XT_TARGET_MARK=m CONFIG_NETFILTER_XT_TARGET_NFLOG=m CONFIG_NETFILTER_XT_TARGET_NFQUEUE=m CONFIG_NETFILTER_XT_TARGET_NOTRACK=m CONFIG_NETFILTER_XT_TARGET_RATEEST=m -CONFIG_NETFILTER_XT_TARGET_TARPIT=m CONFIG_NETFILTER_XT_TARGET_TCPMSS=m CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP=m CONFIG_NETFILTER_XT_TARGET_TRACE=m diff --git a/target/linux/generic-2.6/patches-2.6.21/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.21/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index b08f924..0000000 --- a/target/linux/generic-2.6/patches-2.6.21/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,843 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_comment.h - header-y += xt_connbytes.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -287,6 +287,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -315,6 +323,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/modules.txt>. The module will be called - ipt_CONNMARK.o. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" target support' - depends on NETFILTER_XTABLES -@@ -563,6 +579,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate "Multiple port match support" - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -47,6 +47,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -74,3 +76,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o - obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o - obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff **pskb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(*pskb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ int hotdrop = 0, ret; -+ -+ ret = xm_tcp->match(*pskb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(pskb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(*pskb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(pskb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) -+ xt_chaos_total(info, pskb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static int chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | -+ (1 << NF_IP_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_IP_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_IP_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(&nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(*pskb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static int portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, int *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ in == &loopback_dev, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static int portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); diff --git a/target/linux/generic-2.6/patches-2.6.21/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.21/171-netfilter_tarpit.patch deleted file mode 100644 index bc86a94..0000000 --- a/target/linux/generic-2.6/patches-2.6.21/171-netfilter_tarpit.patch +++ /dev/null @@ -1,319 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -414,6 +414,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -45,6 +45,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE - obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,280 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff **pskb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct sk_buff *skb = *pskb; -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_IP_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static int xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_IP_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.21/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.21/180-netfilter_depends.patch index 9f0d844..83c2247 100644 --- a/target/linux/generic-2.6/patches-2.6.21/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.21/180-netfilter_depends.patch @@ -9,7 +9,7 @@ help H.323 is a VoIP signalling protocol from ITU-T. As one of the most important VoIP protocols, it is widely used by voice hardware and -@@ -433,7 +433,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -400,7 +400,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' diff --git a/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index b156566..0000000 --- a/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,854 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_comment.h - header-y += xt_connbytes.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -265,6 +265,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -292,6 +300,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/kbuild/modules.txt>. The module will be called - ipt_CONNMARK.ko. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" target support' - depends on NETFILTER_XTABLES -@@ -556,6 +572,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate "Multiple port match support" - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -49,6 +49,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -78,3 +80,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) - obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o - obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o - obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff **pskb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(*pskb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false, ret; -+ -+ ret = xm_tcp->match(*pskb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(pskb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(*pskb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(pskb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) -+ xt_chaos_total(info, pskb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | -+ (1 << NF_IP_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_IP_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_IP_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(&nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(*pskb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static bool portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, bool *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ in == &loopback_dev, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static bool portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -1564,6 +1564,8 @@ __u32 secure_tcp_sequence_number(__be32 - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch deleted file mode 100644 index 2bf6866..0000000 --- a/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch +++ /dev/null @@ -1,319 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -401,6 +401,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -47,6 +47,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,280 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff **pskb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct sk_buff *skb = *pskb; -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_IP_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static bool xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_IP_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.23/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.23/180-netfilter_depends.patch index 48afaea..dee5eb7 100644 --- a/target/linux/generic-2.6/patches-2.6.23/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.23/180-netfilter_depends.patch @@ -9,7 +9,7 @@ help H.323 is a VoIP signalling protocol from ITU-T. As one of the most important VoIP protocols, it is widely used by voice hardware and -@@ -420,7 +420,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -387,7 +387,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' diff --git a/target/linux/generic-2.6/patches-2.6.24/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.24/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index 70d0531..0000000 --- a/target/linux/generic-2.6/patches-2.6.24/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,854 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_CONNMARK.h - header-y += xt_CONNSECMARK.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -265,6 +265,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -292,6 +300,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/kbuild/modules.txt>. The module will be called - ipt_CONNMARK.ko. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" target support' - depends on NETFILTER_XTABLES -@@ -556,6 +572,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate "Multiple port match support" - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -49,6 +49,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -79,3 +81,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o - obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff *skb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false, ret; -+ -+ ret = xm_tcp->match(skb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(skb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(skb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(skb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) -+ xt_chaos_total(info, skb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | -+ (1 << NF_IP_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_IP_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_IP_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(skb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static bool portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, bool *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ (in->flags & IFF_LOOPBACK) == IFF_LOOPBACK, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static bool portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -1564,6 +1564,8 @@ __u32 secure_tcp_sequence_number(__be32 - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.24/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.24/171-netfilter_tarpit.patch deleted file mode 100644 index 4c0ecbf..0000000 --- a/target/linux/generic-2.6/patches-2.6.24/171-netfilter_tarpit.patch +++ /dev/null @@ -1,318 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -401,6 +401,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -47,6 +47,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) - obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,279 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff *skb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_IP_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static bool xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_IP_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.24/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.24/180-netfilter_depends.patch index 48afaea..dee5eb7 100644 --- a/target/linux/generic-2.6/patches-2.6.24/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.24/180-netfilter_depends.patch @@ -9,7 +9,7 @@ help H.323 is a VoIP signalling protocol from ITU-T. As one of the most important VoIP protocols, it is widely used by voice hardware and -@@ -420,7 +420,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -387,7 +387,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' diff --git a/target/linux/generic-2.6/patches-2.6.25/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.25/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index 7694519..0000000 --- a/target/linux/generic-2.6/patches-2.6.25/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,854 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_CONNMARK.h - header-y += xt_CONNSECMARK.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -276,6 +276,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -305,6 +313,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/kbuild/modules.txt>. The module will be called - ipt_CONNMARK.ko. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" and "TOS" target support' - depends on NETFILTER_XTABLES -@@ -640,6 +656,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate '"multiport" Multiple port match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -50,6 +50,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -83,3 +85,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o - obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff *skb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false, ret; -+ -+ ret = xm_tcp->match(skb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(skb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(skb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(skb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_INET_LOCAL_OUT) -+ xt_chaos_total(info, skb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | -+ (1 << NF_INET_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_INET_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_INET_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(skb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static bool portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, bool *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ (in->flags & IFF_LOOPBACK) == IFF_LOOPBACK, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static bool portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -1563,6 +1563,8 @@ __u32 secure_tcp_sequence_number(__be32 - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.25/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.25/171-netfilter_tarpit.patch deleted file mode 100644 index d99150f..0000000 --- a/target/linux/generic-2.6/patches-2.6.25/171-netfilter_tarpit.patch +++ /dev/null @@ -1,318 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -437,6 +437,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -47,6 +47,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_RATEEST) += xt_RATEEST.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,279 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&init_net, &nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff *skb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_INET_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static bool xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_INET_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.25/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.25/180-netfilter_depends.patch index 29491e2..efab40c 100644 --- a/target/linux/generic-2.6/patches-2.6.25/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.25/180-netfilter_depends.patch @@ -9,7 +9,7 @@ depends on NETFILTER_ADVANCED help H.323 is a VoIP signalling protocol from ITU-T. As one of the most -@@ -456,7 +456,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -423,7 +423,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' diff --git a/target/linux/generic-2.6/patches-2.6.26/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.26/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index 94f1d19..0000000 --- a/target/linux/generic-2.6/patches-2.6.26/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,854 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_CONNMARK.h - header-y += xt_CONNSECMARK.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -288,6 +288,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -317,6 +325,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/kbuild/modules.txt>. The module will be called - ipt_CONNMARK.ko. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" and "TOS" target support' - depends on NETFILTER_XTABLES -@@ -653,6 +669,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate '"multiport" Multiple port match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -51,6 +51,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -84,3 +86,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o - obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff *skb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false, ret; -+ -+ ret = xm_tcp->match(skb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(skb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(skb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(skb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_INET_LOCAL_OUT) -+ xt_chaos_total(info, skb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | -+ (1 << NF_INET_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_INET_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_INET_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(skb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static bool portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, bool *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ (in->flags & IFF_LOOPBACK) == IFF_LOOPBACK, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static bool portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -1554,6 +1554,8 @@ __u32 secure_tcp_sequence_number(__be32 - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.26/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.26/171-netfilter_tarpit.patch deleted file mode 100644 index 6bddb5b..0000000 --- a/target/linux/generic-2.6/patches-2.6.26/171-netfilter_tarpit.patch +++ /dev/null @@ -1,318 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -449,6 +449,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -48,6 +48,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_RATEEST) += xt_RATEEST.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,279 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&init_net, &nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff *skb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_INET_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static bool xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_INET_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.26/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.26/180-netfilter_depends.patch index e63dd7b..e495b3d 100644 --- a/target/linux/generic-2.6/patches-2.6.26/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.26/180-netfilter_depends.patch @@ -9,7 +9,7 @@ depends on NETFILTER_ADVANCED help H.323 is a VoIP signalling protocol from ITU-T. As one of the most -@@ -468,7 +468,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -435,7 +435,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' diff --git a/target/linux/generic-2.6/patches-2.6.27/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.27/170-netfilter_chaostables_0.8.patch deleted file mode 100644 index 15797e8..0000000 --- a/target/linux/generic-2.6/patches-2.6.27/170-netfilter_chaostables_0.8.patch +++ /dev/null @@ -1,854 +0,0 @@ ---- a/include/linux/netfilter/Kbuild -+++ b/include/linux/netfilter/Kbuild -@@ -3,6 +3,7 @@ header-y += nf_conntrack_tuple_common.h - header-y += nfnetlink_conntrack.h - header-y += nfnetlink_log.h - header-y += nfnetlink_queue.h -+header-y += xt_CHAOS.h - header-y += xt_CLASSIFY.h - header-y += xt_CONNMARK.h - header-y += xt_CONNSECMARK.h ---- /dev/null -+++ b/include/linux/netfilter/oot_conntrack.h -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif ---- /dev/null -+++ b/include/linux/netfilter/oot_trans.h -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif ---- /dev/null -+++ b/include/linux/netfilter/xt_CHAOS.h -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_NETFILTER_XT_CHAOS_H -+#define _LINUX_NETFILTER_XT_CHAOS_H 1 -+ -+enum xt_chaos_target_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_target_info { -+ uint8_t variant; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ ---- /dev/null -+++ b/include/linux/netfilter/xt_portscan.h -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H -+#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_match_info { -+ uint8_t match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ ---- /dev/null -+++ b/net/netfilter/find_match.c -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ This program is free software; you can redistribute it and/or modify -+ it under the terms of the GNU General Public License version 2 as -+ published by the Free Software Foundation. -+*/ -+#include <linux/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if (IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -296,6 +296,14 @@ config NETFILTER_XTABLES - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -325,6 +333,14 @@ config NETFILTER_XT_TARGET_CONNMARK - <file:Documentation/kbuild/modules.txt>. The module will be called - ipt_CONNMARK.ko. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" and "TOS" target support' - depends on NETFILTER_XTABLES -@@ -661,6 +677,14 @@ config NETFILTER_XT_MATCH_POLICY - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate '"multiport" Multiple port match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -51,6 +51,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - - # matches - obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o -@@ -84,3 +86,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o - obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o ---- /dev/null -+++ b/net/netfilter/xt_CHAOS.c -@@ -0,0 +1,200 @@ -+/* -+ * CHAOS target for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#if defined(_LOCAL) -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ -+ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) -+# include <linux/netfilter/xt_CHAOS.h> -+# include "find_match.c" -+#else -+# include "xt_CHAOS.h" -+# include "find_match.c" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_target_info *info, -+ struct sk_buff *skb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ const int protoff = 4 * iph->ihl; -+ const int offset = ntohs(iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false, ret; -+ -+ ret = xm_tcp->match(skb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+ destiny->target(skb, in, out, hooknum, destiny, NULL); -+ return; -+} -+ -+static unsigned int chaos_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* -+ * Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_target_info *info = targinfo; -+ const struct iphdr *iph = ip_hdr(skb); -+ -+ if ((unsigned int)net_random() <= reject_percentage) -+ return xt_reject->target(skb, in, out, hooknum, target, -+ &reject_params); -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if (iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_INET_LOCAL_OUT) -+ xt_chaos_total(info, skb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool chaos_tg_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, unsigned int hook_mask) -+{ -+ const struct xt_chaos_target_info *info = targinfo; -+ -+ if (info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return false; -+ } -+ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return false; -+ } -+ -+ return true; -+} -+ -+static struct xt_target chaos_tg_reg = { -+ .name = "CHAOS", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) | -+ (1 << NF_INET_LOCAL_OUT), -+ .checkentry = chaos_tg_check, -+ .target = chaos_tg, -+ .targetsize = sizeof(struct xt_chaos_target_info), -+ .me = THIS_MODULE, -+}; -+ -+static int __init chaos_tg_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if (xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if (xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if (!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if (!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit chaos_tg_exit(void) -+{ -+ xt_unregister_target(&chaos_tg_reg); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if (have_delude) -+ module_put(xt_delude->me); -+ if (have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(chaos_tg_init); -+module_exit(chaos_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); ---- /dev/null -+++ b/net/netfilter/xt_DELUDE.c -@@ -0,0 +1,197 @@ -+/* -+ * DELUDE target -+ * Copyright © CC Computer Consultants GmbH, 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ * (C) 1999-2001 Paul `Rusty' Russell -+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ * -+ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/tcp.h> -+#include <linux/netfilter/x_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <net/tcp.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) -+{ -+ struct tcphdr _otcph, *oth, *tcph; -+ unsigned int addr_type; -+ struct sk_buff *nskb; -+ u_int16_t tmp_port; -+ u_int32_t tmp_addr; -+ struct iphdr *niph; -+ bool needs_ack; -+ -+ /* IP header checks: fragment. */ -+ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->mark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); -+ -+ /* Swap source and dest */ -+ niph = ip_hdr(nskb); -+ tmp_addr = niph->saddr; -+ niph->saddr = niph->daddr; -+ niph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr) / 4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - ip_hdrlen(oldskb) - -+ (oth->doff << 2)); -+ tcph->seq = false; -+ tcph->ack = true; -+ } else { -+ if (!tcph->ack) { -+ needs_ack = true; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + -+ oth->fin + oldskb->len - -+ ip_hdrlen(oldskb) - (oth->doff<<2)); -+ tcph->seq = false; -+ } else { -+ needs_ack = false; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = false; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = true; -+ tcph->ack = needs_ack; -+ } -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, -+ niph->daddr, csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+#ifdef CONFIG_BRIDGE_NETFILTER -+ if (hook != NF_INET_FORWARD || (nskb->nf_bridge != NULL && -+ nskb->nf_bridge->mask & BRNF_BRIDGED)) -+#else -+ if (hook != NF_INET_FORWARD) -+#endif -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int delude_tg(struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ delude_send_reset(skb, hooknum); -+ return NF_DROP; -+} -+ -+static struct xt_target delude_tg_reg = { -+ .name = "DELUDE", -+ .family = AF_INET, -+ .table = "filter", -+ .hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD), -+ .target = delude_tg, -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init delude_tg_init(void) -+{ -+ return xt_register_target(&delude_tg_reg); -+} -+ -+static void __exit delude_tg_exit(void) -+{ -+ xt_unregister_target(&delude_tg_reg); -+} -+ -+module_init(delude_tg_init); -+module_exit(delude_tg_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); ---- /dev/null -+++ b/net/netfilter/xt_portscan.c -@@ -0,0 +1,269 @@ -+/* -+ * portscan match for netfilter -+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 -+ * Contact: Jan Engelhardt <jengelh@computergmbh.de> -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License; either version -+ * 2 or 3 as published by the Free Software Foundation. -+ */ -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <net/netfilter/nf_nat_rule.h> -+#if defined(_LOCAL) -+# include "xt_portscan.h" -+#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) -+# include <linux/netfilter/xt_portscan.h> -+#else -+# include "xt_portscan.h" -+#endif -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline bool tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline bool tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline bool tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline bool tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline bool tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline bool tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline bool portscan_mt_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if (tflg_rstack(th)) -+ return false; -+ -+ if (tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return false; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline unsigned int portscan_mt_full(int mark, -+ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, -+ unsigned int payload_len) -+{ -+ if (mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if (tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if (mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if (tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if (mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if (loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if (loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if (tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static bool portscan_mt(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, bool *hotdrop) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ const struct tcphdr *tcph; -+ struct nf_conn *ctdata; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if (tcph == NULL) -+ return false; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { -+ if (info->match_stealth) -+ return portscan_mt_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return false; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if ((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->mark & packet_mask) != mark_seen) { -+ unsigned int n; -+ -+ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, -+ (in->flags & IFF_LOOPBACK) == IFF_LOOPBACK, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->mark = -+ (skb->mark & ~packet_mask) ^ mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static bool portscan_mt_check(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) -+{ -+ const struct xt_portscan_match_info *info = matchinfo; -+ -+ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return false; -+ } -+ return true; -+} -+ -+static struct xt_match portscan_mt_reg __read_mostly = { -+ .name = "portscan", -+ .family = AF_INET, -+ .match = portscan_mt, -+ .checkentry = portscan_mt_check, -+ .matchsize = sizeof(struct xt_portscan_match_info), -+ .proto = IPPROTO_TCP, -+ .me = THIS_MODULE, -+}; -+ -+static int __init portscan_mt_init(void) -+{ -+ return xt_register_match(&portscan_mt_reg); -+} -+ -+static void __exit portscan_mt_exit(void) -+{ -+ xt_unregister_match(&portscan_mt_reg); -+ return; -+} -+ -+module_init(portscan_mt_init); -+module_exit(portscan_mt_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); -+MODULE_DESCRIPTION("netfilter \"portscan\" match"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); ---- a/drivers/char/random.c -+++ b/drivers/char/random.c -@@ -1555,6 +1555,8 @@ __u32 secure_tcp_sequence_number(__be32 - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.27/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.27/171-netfilter_tarpit.patch deleted file mode 100644 index 9a3433b..0000000 --- a/target/linux/generic-2.6/patches-2.6.27/171-netfilter_tarpit.patch +++ /dev/null @@ -1,318 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -457,6 +457,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_TARGET_TARPIT -+ tristate '"TARPIT" target support' -+ depends on NETFILTER_XTABLES -+ ---help--- -+ Adds a TARPIT target to iptables, which captures and holds -+ incoming TCP connections using no local per-connection resources. -+ Connections are accepted, but immediately switched to the persist -+ state (0 byte window), in which the remote side stops sending data -+ and asks to continue every 60-240 seconds. Attempts to close the -+ connection are ignored, forcing the remote side to time out the -+ connection in 12-24 minutes. -+ -+ This offers similar functionality to LaBrea -+ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated -+ hardware or IPs. Any TCP port that you would normally DROP or REJECT -+ can instead become a tarpit. -+ - config NETFILTER_XT_TARGET_TCPMSS - tristate '"TCPMSS" target support' - depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -48,6 +48,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE - obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_RATEEST) += xt_RATEEST.o - obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o ---- /dev/null -+++ b/net/netfilter/xt_TARPIT.c -@@ -0,0 +1,279 @@ -+/* -+ * Kernel module to capture and hold incoming TCP connections using -+ * no local per-connection resources. -+ * -+ * Based on ipt_REJECT.c and offering functionality similar to -+ * LaBrea <http://www.hackbusters.net/LaBrea/>. -+ * -+ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> -+ * -+ * 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. -+ * -+ * This program is distributed in the hope that it will be useful, -+ * but WITHOUT ANY WARRANTY; without even the implied warranty of -+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -+ * GNU General Public License for more details. -+ * -+ * You should have received a copy of the GNU General Public License -+ * along with this program; if not, write to the Free Software -+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -+ * -+ * Goal: -+ * - Allow incoming TCP connections to be established. -+ * - Passing data should result in the connection being switched to the -+ * persist state (0 byte window), in which the remote side stops sending -+ * data and asks to continue every 60 seconds. -+ * - Attempts to shut down the connection should be ignored completely, so -+ * the remote side ends up having to time it out. -+ * -+ * This means: -+ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes -+ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing -+ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited -+ */ -+ -+#include <linux/version.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/icmp.h> -+struct in_device; -+#include <net/route.h> -+#include <linux/random.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+#if 0 -+#define DEBUGP printk -+#else -+#define DEBUGP(format, args...) -+#endif -+ -+/* Stolen from ip_finish_output2 */ -+static int ip_direct_send(struct sk_buff *skb) -+{ -+ struct dst_entry *dst = skb->dst; -+ -+ if (dst->hh != NULL) -+ return neigh_hh_output(dst->hh, skb); -+ else if (dst->neighbour != NULL) -+ return dst->neighbour->output(skb); -+ -+ if (net_ratelimit()) -+ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); -+ -+ kfree_skb(skb); -+ return -EINVAL; -+} -+ -+ -+/* Send reply */ -+static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, -+ unsigned int local) -+{ -+ struct sk_buff *nskb; -+ struct rtable *nrt; -+ struct tcphdr *otcph, *ntcph; -+ struct flowi fl = {}; -+ unsigned int otcplen; -+ u_int16_t tmp; -+ -+ const struct iphdr *oiph = ip_hdr(oskb); -+ struct iphdr *niph; -+ -+ /* A truncated TCP header is not going to be useful */ -+ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) -+ return; -+ -+ otcph = (void *)oiph + ip_hdrlen(oskb); -+ otcplen = oskb->len - ip_hdrlen(oskb); -+ -+ /* No replies for RST or FIN */ -+ if (otcph->rst || otcph->fin) -+ return; -+ -+ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ -+ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) -+ return; -+ -+ /* Check checksum. */ -+ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, -+ csum_partial((char *)otcph, otcplen, 0)) != 0) -+ return; -+ -+ /* -+ * Copy skb (even if skb is about to be dropped, we cannot just -+ * clone it because there may be other things, such as tcpdump, -+ * interested in it) -+ */ -+ nskb = skb_copy(oskb, GFP_ATOMIC); -+ if (nskb == NULL) -+ return; -+ -+ niph = ip_hdr(nskb); -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_conntrack_put(nskb->nfct); -+ nskb->nfct = NULL; -+#ifdef CONFIG_NETFILTER_DEBUG -+ nskb->nf_debug = 0; -+#endif -+ -+ ntcph = (void *)niph + ip_hdrlen(nskb); -+ -+ /* Truncate to length (no data) */ -+ ntcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); -+ niph->tot_len = htons(nskb->len); -+ -+ /* Swap source and dest */ -+ niph->daddr = xchg(&niph->saddr, niph->daddr); -+ tmp = ntcph->source; -+ ntcph->source = ntcph->dest; -+ ntcph->dest = tmp; -+ -+ /* Use supplied sequence number or make a new one */ -+ ntcph->seq = otcph->ack ? otcph->ack_seq -+ : htonl(secure_tcp_sequence_number(niph->saddr, -+ niph->daddr, -+ ntcph->source, -+ ntcph->dest)); -+ -+ /* Our SYN-ACKs must have a >0 window */ -+ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; -+ -+ ntcph->urg_ptr = 0; -+ -+ /* Reset flags */ -+ ((u_int8_t *)ntcph)[13] = 0; -+ -+ if (otcph->syn && otcph->ack) { -+ ntcph->rst = 1; -+ ntcph->ack_seq = 0; -+ } else { -+ ntcph->syn = otcph->syn; -+ ntcph->ack = 1; -+ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); -+ } -+ -+ /* Adjust TCP checksum */ -+ ntcph->check = 0; -+ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), -+ niph->saddr, -+ niph->daddr, -+ csum_partial((char *)ntcph, -+ sizeof(struct tcphdr), 0)); -+ -+ fl.nl_u.ip4_u.daddr = niph->daddr; -+ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; -+ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; -+ fl.oif = 0; -+ -+ if (ip_route_output_key(&init_net, &nrt, &fl)) -+ goto free_nskb; -+ -+ dst_release(nskb->dst); -+ nskb->dst = &nrt->u.dst; -+ -+ /* Adjust IP TTL */ -+ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Set DF, id = 0 */ -+ niph->frag_off = htons(IP_DF); -+ niph->id = 0; -+ -+ /* Adjust IP checksum */ -+ niph->check = 0; -+ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ ip_direct_send(nskb); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_tarpit_target(struct sk_buff *skb, -+ const struct net_device *in, -+ const struct net_device *out, -+ unsigned int hooknum, -+ const struct xt_target *target, -+ const void *targinfo) -+{ -+ const struct iphdr *iph = ip_hdr(skb); -+ struct rtable *rt = (void *)skb->dst; -+ -+ /* Do we have an input route cache entry? */ -+ if (rt == NULL) -+ return NF_DROP; -+ -+ /* No replies to physical multicast/broadcast */ -+ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) -+ return NF_DROP; -+ -+ /* Now check at the protocol level */ -+ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) -+ return NF_DROP; -+ -+ /* -+ * Our naive response construction does not deal with IP -+ * options, and probably should not try. -+ */ -+ if (iph->ihl * 4 != sizeof(struct iphdr)) -+ return NF_DROP; -+ -+ /* We are not interested in fragments */ -+ if (iph->frag_off & htons(IP_OFFSET)) -+ return NF_DROP; -+ -+ tarpit_tcp(skb, rt, hooknum == NF_INET_LOCAL_IN); -+ return NF_DROP; -+} -+ -+static bool xt_tarpit_check(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+ unsigned int hook_mask) -+{ -+ bool invalid; -+ -+ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_INET_PRE_ROUTING) -+ return true; -+ if (strcmp(tablename, "filter") != 0) -+ return false; -+ invalid = hook_mask & ~((1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD)); -+ return !invalid; -+} -+ -+static struct xt_target xt_tarpit_reg = { -+ .name = "TARPIT", -+ .family = AF_INET, -+ .proto = IPPROTO_TCP, -+ .target = xt_tarpit_target, -+ .checkentry = xt_tarpit_check, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_tarpit_init(void) -+{ -+ return xt_register_target(&xt_tarpit_reg); -+} -+ -+static void __exit xt_tarpit_exit(void) -+{ -+ xt_unregister_target(&xt_tarpit_reg); -+} -+ -+module_init(xt_tarpit_init); -+module_exit(xt_tarpit_exit); -+MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches-2.6.27/180-netfilter_depends.patch b/target/linux/generic-2.6/patches-2.6.27/180-netfilter_depends.patch index 8301e54..1914818 100644 --- a/target/linux/generic-2.6/patches-2.6.27/180-netfilter_depends.patch +++ b/target/linux/generic-2.6/patches-2.6.27/180-netfilter_depends.patch @@ -9,7 +9,7 @@ depends on NETFILTER_ADVANCED help H.323 is a VoIP signalling protocol from ITU-T. As one of the most -@@ -476,7 +476,7 @@ config NETFILTER_XT_TARGET_TARPIT +@@ -443,7 +443,7 @@ config NETFILTER_XT_TARGET_CONNSECMARK config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' |