diff options
Diffstat (limited to 'target/linux/generic/files/crypto/ocf/crypto.c')
| -rw-r--r-- | target/linux/generic/files/crypto/ocf/crypto.c | 1784 |
1 files changed, 1784 insertions, 0 deletions
diff --git a/target/linux/generic/files/crypto/ocf/crypto.c b/target/linux/generic/files/crypto/ocf/crypto.c new file mode 100644 index 0000000..9735f0c --- /dev/null +++ b/target/linux/generic/files/crypto/ocf/crypto.c @@ -0,0 +1,1784 @@ +/*- + * Linux port done by David McCullough <david_mccullough@mcafee.com> + * Copyright (C) 2006-2010 David McCullough + * Copyright (C) 2004-2005 Intel Corporation. + * The license and original author are listed below. + * + * Redistribution and use in source and binary forms, with or without + * Copyright (c) 2002-2006 Sam Leffler. All rights reserved. + * + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#if 0 +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/sys/opencrypto/crypto.c,v 1.27 2007/03/21 03:42:51 sam Exp $"); +#endif + +/* + * Cryptographic Subsystem. + * + * This code is derived from the Openbsd Cryptographic Framework (OCF) + * that has the copyright shown below. Very little of the original + * code remains. + */ +/*- + * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu) + * + * This code was written by Angelos D. Keromytis in Athens, Greece, in + * February 2000. Network Security Technologies Inc. (NSTI) kindly + * supported the development of this code. + * + * Copyright (c) 2000, 2001 Angelos D. Keromytis + * + * Permission to use, copy, and modify this software with or without fee + * is hereby granted, provided that this entire notice is included in + * all source code copies of any software which is or includes a copy or + * modification of this software. + * + * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY + * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE + * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR + * PURPOSE. + * +__FBSDID("$FreeBSD: src/sys/opencrypto/crypto.c,v 1.16 2005/01/07 02:29:16 imp Exp $"); + */ + + +#ifndef AUTOCONF_INCLUDED +#include <linux/config.h> +#endif +#include <linux/module.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/wait.h> +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <linux/version.h> +#include <cryptodev.h> + +/* + * keep track of whether or not we have been initialised, a big + * issue if we are linked into the kernel and a driver gets started before + * us + */ +static int crypto_initted = 0; + +/* + * Crypto drivers register themselves by allocating a slot in the + * crypto_drivers table with crypto_get_driverid() and then registering + * each algorithm they support with crypto_register() and crypto_kregister(). + */ + +/* + * lock on driver table + * we track its state as spin_is_locked does not do anything on non-SMP boxes + */ +static spinlock_t crypto_drivers_lock; +static int crypto_drivers_locked; /* for non-SMP boxes */ + +#define CRYPTO_DRIVER_LOCK() \ + ({ \ + spin_lock_irqsave(&crypto_drivers_lock, d_flags); \ + crypto_drivers_locked = 1; \ + dprintk("%s,%d: DRIVER_LOCK()\n", __FILE__, __LINE__); \ + }) +#define CRYPTO_DRIVER_UNLOCK() \ + ({ \ + dprintk("%s,%d: DRIVER_UNLOCK()\n", __FILE__, __LINE__); \ + crypto_drivers_locked = 0; \ + spin_unlock_irqrestore(&crypto_drivers_lock, d_flags); \ + }) +#define CRYPTO_DRIVER_ASSERT() \ + ({ \ + if (!crypto_drivers_locked) { \ + dprintk("%s,%d: DRIVER_ASSERT!\n", __FILE__, __LINE__); \ + } \ + }) + +/* + * Crypto device/driver capabilities structure. + * + * Synchronization: + * (d) - protected by CRYPTO_DRIVER_LOCK() + * (q) - protected by CRYPTO_Q_LOCK() + * Not tagged fields are read-only. + */ +struct cryptocap { + device_t cc_dev; /* (d) device/driver */ + u_int32_t cc_sessions; /* (d) # of sessions */ + u_int32_t cc_koperations; /* (d) # os asym operations */ + /* + * Largest possible operator length (in bits) for each type of + * encryption algorithm. XXX not used + */ + u_int16_t cc_max_op_len[CRYPTO_ALGORITHM_MAX + 1]; + u_int8_t cc_alg[CRYPTO_ALGORITHM_MAX + 1]; + u_int8_t cc_kalg[CRK_ALGORITHM_MAX + 1]; + + int cc_flags; /* (d) flags */ +#define CRYPTOCAP_F_CLEANUP 0x80000000 /* needs resource cleanup */ + int cc_qblocked; /* (q) symmetric q blocked */ + int cc_kqblocked; /* (q) asymmetric q blocked */ + + int cc_unqblocked; /* (q) symmetric q blocked */ + int cc_unkqblocked; /* (q) asymmetric q blocked */ +}; +static struct cryptocap *crypto_drivers = NULL; +static int crypto_drivers_num = 0; + +/* + * There are two queues for crypto requests; one for symmetric (e.g. + * cipher) operations and one for asymmetric (e.g. MOD)operations. + * A single mutex is used to lock access to both queues. We could + * have one per-queue but having one simplifies handling of block/unblock + * operations. + */ +static int crp_sleep = 0; +static LIST_HEAD(crp_q); /* request queues */ +static LIST_HEAD(crp_kq); + +static spinlock_t crypto_q_lock; + +int crypto_all_qblocked = 0; /* protect with Q_LOCK */ +module_param(crypto_all_qblocked, int, 0444); +MODULE_PARM_DESC(crypto_all_qblocked, "Are all crypto queues blocked"); + +int crypto_all_kqblocked = 0; /* protect with Q_LOCK */ +module_param(crypto_all_kqblocked, int, 0444); +MODULE_PARM_DESC(crypto_all_kqblocked, "Are all asym crypto queues blocked"); + +#define CRYPTO_Q_LOCK() \ + ({ \ + spin_lock_irqsave(&crypto_q_lock, q_flags); \ + dprintk("%s,%d: Q_LOCK()\n", __FILE__, __LINE__); \ + }) +#define CRYPTO_Q_UNLOCK() \ + ({ \ + dprintk("%s,%d: Q_UNLOCK()\n", __FILE__, __LINE__); \ + spin_unlock_irqrestore(&crypto_q_lock, q_flags); \ + }) + +/* + * There are two queues for processing completed crypto requests; one + * for the symmetric and one for the asymmetric ops. We only need one + * but have two to avoid type futzing (cryptop vs. cryptkop). A single + * mutex is used to lock access to both queues. Note that this lock + * must be separate from the lock on request queues to insure driver + * callbacks don't generate lock order reversals. + */ +static LIST_HEAD(crp_ret_q); /* callback queues */ +static LIST_HEAD(crp_ret_kq); + +static spinlock_t crypto_ret_q_lock; +#define CRYPTO_RETQ_LOCK() \ + ({ \ + spin_lock_irqsave(&crypto_ret_q_lock, r_flags); \ + dprintk("%s,%d: RETQ_LOCK\n", __FILE__, __LINE__); \ + }) +#define CRYPTO_RETQ_UNLOCK() \ + ({ \ + dprintk("%s,%d: RETQ_UNLOCK\n", __FILE__, __LINE__); \ + spin_unlock_irqrestore(&crypto_ret_q_lock, r_flags); \ + }) +#define CRYPTO_RETQ_EMPTY() (list_empty(&crp_ret_q) && list_empty(&crp_ret_kq)) + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) +static kmem_cache_t *cryptop_zone; +static kmem_cache_t *cryptodesc_zone; +#else +static struct kmem_cache *cryptop_zone; +static struct kmem_cache *cryptodesc_zone; +#endif + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27) +#include <linux/sched.h> +#define kill_proc(p,s,v) send_sig(s,find_task_by_vpid(p),0) +#endif + +#define debug crypto_debug +int crypto_debug = 0; +module_param(crypto_debug, int, 0644); +MODULE_PARM_DESC(crypto_debug, "Enable debug"); +EXPORT_SYMBOL(crypto_debug); + +/* + * Maximum number of outstanding crypto requests before we start + * failing requests. We need this to prevent DOS when too many + * requests are arriving for us to keep up. Otherwise we will + * run the system out of memory. Since crypto is slow, we are + * usually the bottleneck that needs to say, enough is enough. + * + * We cannot print errors when this condition occurs, we are already too + * slow, printing anything will just kill us + */ + +static int crypto_q_cnt = 0; +module_param(crypto_q_cnt, int, 0444); +MODULE_PARM_DESC(crypto_q_cnt, + "Current number of outstanding crypto requests"); + +static int crypto_q_max = 1000; +module_param(crypto_q_max, int, 0644); +MODULE_PARM_DESC(crypto_q_max, + "Maximum number of outstanding crypto requests"); + +#define bootverbose crypto_verbose +static int crypto_verbose = 0; +module_param(crypto_verbose, int, 0644); +MODULE_PARM_DESC(crypto_verbose, + "Enable verbose crypto startup"); + +int crypto_usercrypto = 1; /* userland may do crypto reqs */ +module_param(crypto_usercrypto, int, 0644); +MODULE_PARM_DESC(crypto_usercrypto, + "Enable/disable user-mode access to crypto support"); + +int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */ +module_param(crypto_userasymcrypto, int, 0644); +MODULE_PARM_DESC(crypto_userasymcrypto, + "Enable/disable user-mode access to asymmetric crypto support"); + +int crypto_devallowsoft = 0; /* only use hardware crypto */ +module_param(crypto_devallowsoft, int, 0644); +MODULE_PARM_DESC(crypto_devallowsoft, + "Enable/disable use of software crypto support"); + +/* + * This parameter controls the maximum number of crypto operations to + * do consecutively in the crypto kernel thread before scheduling to allow + * other processes to run. Without it, it is possible to get into a + * situation where the crypto thread never allows any other processes to run. + * Default to 1000 which should be less than one second. + */ +static int crypto_max_loopcount = 1000; +module_param(crypto_max_loopcount, int, 0644); +MODULE_PARM_DESC(crypto_max_loopcount, + "Maximum number of crypto ops to do before yielding to other processes"); + +static pid_t cryptoproc = (pid_t) -1; +static struct completion cryptoproc_exited; +static DECLARE_WAIT_QUEUE_HEAD(cryptoproc_wait); +static pid_t cryptoretproc = (pid_t) -1; +static struct completion cryptoretproc_exited; +static DECLARE_WAIT_QUEUE_HEAD(cryptoretproc_wait); + +static int crypto_proc(void *arg); +static int crypto_ret_proc(void *arg); +static int crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint); +static int crypto_kinvoke(struct cryptkop *krp, int flags); +static void crypto_exit(void); +static int crypto_init(void); + +static struct cryptostats cryptostats; + +static struct cryptocap * +crypto_checkdriver(u_int32_t hid) +{ + if (crypto_drivers == NULL) + return NULL; + return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]); +} + +/* + * Compare a driver's list of supported algorithms against another + * list; return non-zero if all algorithms are supported. + */ +static int +driver_suitable(const struct cryptocap *cap, const struct cryptoini *cri) +{ + const struct cryptoini *cr; + + /* See if all the algorithms are supported. */ + for (cr = cri; cr; cr = cr->cri_next) + if (cap->cc_alg[cr->cri_alg] == 0) + return 0; + return 1; +} + +/* + * Select a driver for a new session that supports the specified + * algorithms and, optionally, is constrained according to the flags. + * The algorithm we use here is pretty stupid; just use the + * first driver that supports all the algorithms we need. If there + * are multiple drivers we choose the driver with the fewest active + * sessions. We prefer hardware-backed drivers to software ones. + * + * XXX We need more smarts here (in real life too, but that's + * XXX another story altogether). + */ +static struct cryptocap * +crypto_select_driver(const struct cryptoini *cri, int flags) +{ + struct cryptocap *cap, *best; + int match, hid; + + CRYPTO_DRIVER_ASSERT(); + + /* + * Look first for hardware crypto devices if permitted. + */ + if (flags & CRYPTOCAP_F_HARDWARE) + match = CRYPTOCAP_F_HARDWARE; + else + match = CRYPTOCAP_F_SOFTWARE; + best = NULL; +again: + for (hid = 0; hid < crypto_drivers_num; hid++) { + cap = &crypto_drivers[hid]; + /* + * If it's not initialized, is in the process of + * going away, or is not appropriate (hardware + * or software based on match), then skip. + */ + if (cap->cc_dev == NULL || + (cap->cc_flags & CRYPTOCAP_F_CLEANUP) || + (cap->cc_flags & match) == 0) + continue; + + /* verify all the algorithms are supported. */ + if (driver_suitable(cap, cri)) { + if (best == NULL || + cap->cc_sessions < best->cc_sessions) + best = cap; + } + } + if (best != NULL) + return best; + if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) { + /* sort of an Algol 68-style for loop */ + match = CRYPTOCAP_F_SOFTWARE; + goto again; + } + return best; +} + +/* + * Create a new session. The crid argument specifies a crypto + * driver to use or constraints on a driver to select (hardware + * only, software only, either). Whatever driver is selected + * must be capable of the requested crypto algorithms. + */ +int +crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid) +{ + struct cryptocap *cap; + u_int32_t hid, lid; + int err; + unsigned long d_flags; + + CRYPTO_DRIVER_LOCK(); + if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { + /* + * Use specified driver; verify it is capable. + */ + cap = crypto_checkdriver(crid); + if (cap != NULL && !driver_suitable(cap, cri)) + cap = NULL; + } else { + /* + * No requested driver; select based on crid flags. + */ + cap = crypto_select_driver(cri, crid); + /* + * if NULL then can't do everything in one session. + * XXX Fix this. We need to inject a "virtual" session + * XXX layer right about here. + */ + } + if (cap != NULL) { + /* Call the driver initialization routine. */ + hid = cap - crypto_drivers; + lid = hid; /* Pass the driver ID. */ + cap->cc_sessions++; + CRYPTO_DRIVER_UNLOCK(); + err = CRYPTODEV_NEWSESSION(cap->cc_dev, &lid, cri); + CRYPTO_DRIVER_LOCK(); + if (err == 0) { + (*sid) = (cap->cc_flags & 0xff000000) + | (hid & 0x00ffffff); + (*sid) <<= 32; + (*sid) |= (lid & 0xffffffff); + } else + cap->cc_sessions--; + } else + err = EINVAL; + CRYPTO_DRIVER_UNLOCK(); + return err; +} + +static void +crypto_remove(struct cryptocap *cap) +{ + CRYPTO_DRIVER_ASSERT(); + if (cap->cc_sessions == 0 && cap->cc_koperations == 0) + bzero(cap, sizeof(*cap)); +} + +/* + * Delete an existing session (or a reserved session on an unregistered + * driver). + */ +int +crypto_freesession(u_int64_t sid) +{ + struct cryptocap *cap; + u_int32_t hid; + int err = 0; + unsigned long d_flags; + + dprintk("%s()\n", __FUNCTION__); + CRYPTO_DRIVER_LOCK(); + + if (crypto_drivers == NULL) { + err = EINVAL; + goto done; + } + + /* Determine two IDs. */ + hid = CRYPTO_SESID2HID(sid); + + if (hid >= crypto_drivers_num) { + dprintk("%s - INVALID DRIVER NUM %d\n", __FUNCTION__, hid); + err = ENOENT; + goto done; + } + cap = &crypto_drivers[hid]; + + if (cap->cc_dev) { + CRYPTO_DRIVER_UNLOCK(); + /* Call the driver cleanup routine, if available, unlocked. */ + err = CRYPTODEV_FREESESSION(cap->cc_dev, sid); + CRYPTO_DRIVER_LOCK(); + } + + if (cap->cc_sessions) + cap->cc_sessions--; + + if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) + crypto_remove(cap); + +done: + CRYPTO_DRIVER_UNLOCK(); + return err; +} + +/* + * Return an unused driver id. Used by drivers prior to registering + * support for the algorithms they handle. + */ +int32_t +crypto_get_driverid(device_t dev, int flags) +{ + struct cryptocap *newdrv; + int i; + unsigned long d_flags; + + if ((flags & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { + printf("%s: no flags specified when registering driver\n", + device_get_nameunit(dev)); + return -1; + } + + CRYPTO_DRIVER_LOCK(); + + for (i = 0; i < crypto_drivers_num; i++) { + if (crypto_drivers[i].cc_dev == NULL && + (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0) { + break; + } + } + + /* Out of entries, allocate some more. */ + if (i == crypto_drivers_num) { + /* Be careful about wrap-around. */ + if (2 * crypto_drivers_num <= crypto_drivers_num) { + CRYPTO_DRIVER_UNLOCK(); + printk("crypto: driver count wraparound!\n"); + return -1; + } + + newdrv = kmalloc(2 * crypto_drivers_num * sizeof(struct cryptocap), + GFP_KERNEL); + if (newdrv == NULL) { + CRYPTO_DRIVER_UNLOCK(); + printk("crypto: no space to expand driver table!\n"); + return -1; + } + + memcpy(newdrv, crypto_drivers, + crypto_drivers_num * sizeof(struct cryptocap)); + memset(&newdrv[crypto_drivers_num], 0, + crypto_drivers_num * sizeof(struct cryptocap)); + + crypto_drivers_num *= 2; + + kfree(crypto_drivers); + crypto_drivers = newdrv; + } + + /* NB: state is zero'd on free */ + crypto_drivers[i].cc_sessions = 1; /* Mark */ + crypto_drivers[i].cc_dev = dev; + crypto_drivers[i].cc_flags = flags; + if (bootverbose) + printf("crypto: assign %s driver id %u, flags %u\n", + device_get_nameunit(dev), i, flags); + + CRYPTO_DRIVER_UNLOCK(); + + return i; +} + +/* + * Lookup a driver by name. We match against the full device + * name and unit, and against just the name. The latter gives + * us a simple widlcarding by device name. On success return the + * driver/hardware identifier; otherwise return -1. + */ +int +crypto_find_driver(const char *match) +{ + int i, len = strlen(match); + unsigned long d_flags; + + CRYPTO_DRIVER_LOCK(); + for (i = 0; i < crypto_drivers_num; i++) { + device_t dev = crypto_drivers[i].cc_dev; + if (dev == NULL || + (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP)) + continue; + if (strncmp(match, device_get_nameunit(dev), len) == 0 || + strncmp(match, device_get_name(dev), len) == 0) + break; + } + CRYPTO_DRIVER_UNLOCK(); + return i < crypto_drivers_num ? i : -1; +} + +/* + * Return the device_t for the specified driver or NULL + * if the driver identifier is invalid. + */ +device_t +crypto_find_device_byhid(int hid) +{ + struct cryptocap *cap = crypto_checkdriver(hid); + return cap != NULL ? cap->cc_dev : NULL; +} + +/* + * Return the device/driver capabilities. + */ +int +crypto_getcaps(int hid) +{ + struct cryptocap *cap = crypto_checkdriver(hid); + return cap != NULL ? cap->cc_flags : 0; +} + +/* + * Register support for a key-related algorithm. This routine + * is called once for each algorithm supported a driver. + */ +int +crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags) +{ + struct cryptocap *cap; + int err; + unsigned long d_flags; + + dprintk("%s()\n", __FUNCTION__); + CRYPTO_DRIVER_LOCK(); + + cap = crypto_checkdriver(driverid); + if (cap != NULL && + (CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) { + /* + * XXX Do some performance testing to determine placing. + * XXX We probably need an auxiliary data structure that + * XXX describes relative performances. + */ + + cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED; + if (bootverbose) + printf("crypto: %s registers key alg %u flags %u\n" + , device_get_nameunit(cap->cc_dev) + , kalg + , flags + ); + err = 0; + } else + err = EINVAL; + + CRYPTO_DRIVER_UNLOCK(); + return err; +} + +/* + * Register support for a non-key-related algorithm. This routine + * is called once for each such algorithm supported by a driver. + */ +int +crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen, + u_int32_t flags) +{ + struct cryptocap *cap; + int err; + unsigned long d_flags; + + dprintk("%s(id=0x%x, alg=%d, maxoplen=%d, flags=0x%x)\n", __FUNCTION__, + driverid, alg, maxoplen, flags); + + CRYPTO_DRIVER_LOCK(); + + cap = crypto_checkdriver(driverid); + /* NB: algorithms are in the range [1..max] */ + if (cap != NULL && + (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) { + /* + * XXX Do some performance testing to determine placing. + * XXX We probably need an auxiliary data structure that + * XXX describes relative performances. + */ + + cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED; + cap->cc_max_op_len[alg] = maxoplen; + if (bootverbose) + printf("crypto: %s registers alg %u flags %u maxoplen %u\n" + , device_get_nameunit(cap->cc_dev) + , alg + , flags + , maxoplen + ); + cap->cc_sessions = 0; /* Unmark */ + err = 0; + } else + err = EINVAL; + + CRYPTO_DRIVER_UNLOCK(); + return err; +} + +static void +driver_finis(struct cryptocap *cap) +{ + u_int32_t ses, kops; + + CRYPTO_DRIVER_ASSERT(); + + ses = cap->cc_sessions; + kops = cap->cc_koperations; + bzero(cap, sizeof(*cap)); + if (ses != 0 || kops != 0) { + /* + * If there are pending sessions, + * just mark as invalid. + */ + cap->cc_flags |= CRYPTOCAP_F_CLEANUP; + cap->cc_sessions = ses; + cap->cc_koperations = kops; + } +} + +/* + * Unregister a crypto driver. If there are pending sessions using it, + * leave enough information around so that subsequent calls using those + * sessions will correctly detect the driver has been unregistered and + * reroute requests. + */ +int +crypto_unregister(u_int32_t driverid, int alg) +{ + struct cryptocap *cap; + int i, err; + unsigned long d_flags; + + dprintk("%s()\n", __FUNCTION__); + CRYPTO_DRIVER_LOCK(); + + cap = crypto_checkdriver(driverid); + if (cap != NULL && + (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) && + cap->cc_alg[alg] != 0) { + cap->cc_alg[alg] = 0; + cap->cc_max_op_len[alg] = 0; + + /* Was this the last algorithm ? */ + for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++) + if (cap->cc_alg[i] != 0) + break; + + if (i == CRYPTO_ALGORITHM_MAX + 1) + driver_finis(cap); + err = 0; + } else + err = EINVAL; + CRYPTO_DRIVER_UNLOCK(); + return err; +} + +/* + * Unregister all algorithms associated with a crypto driver. + * If there are pending sessions using it, leave enough information + * around so that subsequent calls using those sessions will + * correctly detect the driver has been unregistered and reroute + * requests. + */ +int +crypto_unregister_all(u_int32_t driverid) +{ + struct cryptocap *cap; + int err; + unsigned long d_flags; + + dprintk("%s()\n", __FUNCTION__); + CRYPTO_DRIVER_LOCK(); + cap = crypto_checkdriver(driverid); + if (cap != NULL) { + driver_finis(cap); + err = 0; + } else + err = EINVAL; + CRYPTO_DRIVER_UNLOCK(); + + return err; +} + +/* + * Clear blockage on a driver. The what parameter indicates whether + * the driver is now ready for cryptop's and/or cryptokop's. + */ +int +crypto_unblock(u_int32_t driverid, int what) +{ + struct cryptocap *cap; + int err; + unsigned long q_flags; + + CRYPTO_Q_LOCK(); + cap = crypto_checkdriver(driverid); + if (cap != NULL) { + if (what & CRYPTO_SYMQ) { + cap->cc_qblocked = 0; + cap->cc_unqblocked = 0; + crypto_all_qblocked = 0; + } + if (what & CRYPTO_ASYMQ) { + cap->cc_kqblocked = 0; + cap->cc_unkqblocked = 0; + crypto_all_kqblocked = 0; + } + if (crp_sleep) + wake_up_interruptible(&cryptoproc_wait); + err = 0; + } else + err = EINVAL; + CRYPTO_Q_UNLOCK(); //DAVIDM should this be a driver lock + + return err; +} + +/* + * Add a crypto request to a queue, to be processed by the kernel thread. + */ +int +crypto_dispatch(struct cryptop *crp) +{ + struct cryptocap *cap; + int result = -1; + unsigned long q_flags; + + dprintk("%s()\n", __FUNCTION__); + + cryptostats.cs_ops++; + + CRYPTO_Q_LOCK(); + if (crypto_q_cnt >= crypto_q_max) { + CRYPTO_Q_UNLOCK(); + cryptostats.cs_drops++; + return ENOMEM; + } + crypto_q_cnt++; + + /* make sure we are starting a fresh run on this crp. */ + crp->crp_flags &= ~CRYPTO_F_DONE; + crp->crp_etype = 0; + + /* + * Caller marked the request to be processed immediately; dispatch + * it directly to the driver unless the driver is currently blocked. + */ + if ((crp->crp_flags & CRYPTO_F_BATCH) == 0) { + int hid = CRYPTO_SESID2HID(crp->crp_sid); + cap = crypto_checkdriver(hid); + /* Driver cannot disappear when there is an active session. */ + KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__)); + if (!cap->cc_qblocked) { + crypto_all_qblocked = 0; + crypto_drivers[hid].cc_unqblocked = 1; + CRYPTO_Q_UNLOCK(); + result = crypto_invoke(cap, crp, 0); + CRYPTO_Q_LOCK(); + if (result == ERESTART) + if (crypto_drivers[hid].cc_unqblocked) + crypto_drivers[hid].cc_qblocked = 1; + crypto_drivers[hid].cc_unqblocked = 0; + } + } + if (result == ERESTART) { + /* + * The driver ran out of resources, mark the + * driver ``blocked'' for cryptop's and put + * the request back in the queue. It would + * best to put the request back where we got + * it but that's hard so for now we put it + * at the front. This should be ok; putting + * it at the end does not work. + */ + list_add(&crp->crp_next, &crp_q); + cryptostats.cs_blocks++; + result = 0; + } else if (result == -1) { + TAILQ_INSERT_TAIL(&crp_q, crp, crp_next); + result = 0; + } + if (crp_sleep) + wake_up_interruptible(&cryptoproc_wait); + CRYPTO_Q_UNLOCK(); + return result; +} + +/* + * Add an asymetric crypto request to a queue, + * to be processed by the kernel thread. + */ +int +crypto_kdispatch(struct cryptkop *krp) +{ + int error; + unsigned long q_flags; + + cryptostats.cs_kops++; + + error = crypto_kinvoke(krp, krp->krp_crid); + if (error == ERESTART) { + CRYPTO_Q_LOCK(); + TAILQ_INSERT_TAIL(&crp_kq, krp, krp_next); + if (crp_sleep) + wake_up_interruptible(&cryptoproc_wait); + CRYPTO_Q_UNLOCK(); + error = 0; + } + return error; +} + +/* + * Verify a driver is suitable for the specified operation. + */ +static __inline int +kdriver_suitable(const struct cryptocap *cap, const struct cryptkop *krp) +{ + return (cap->cc_kalg[krp->krp_op] & CRYPTO_ALG_FLAG_SUPPORTED) != 0; +} + +/* + * Select a driver for an asym operation. The driver must + * support the necessary algorithm. The caller can constrain + * which device is selected with the flags parameter. The + * algorithm we use here is pretty stupid; just use the first + * driver that supports the algorithms we need. If there are + * multiple suitable drivers we choose the driver with the + * fewest active operations. We prefer hardware-backed + * drivers to software ones when either may be used. + */ +static struct cryptocap * +crypto_select_kdriver(const struct cryptkop *krp, int flags) +{ + struct cryptocap *cap, *best, *blocked; + int match, hid; + + CRYPTO_DRIVER_ASSERT(); + + /* + * Look first for hardware crypto devices if permitted. + */ + if (flags & CRYPTOCAP_F_HARDWARE) + match = CRYPTOCAP_F_HARDWARE; + else + match = CRYPTOCAP_F_SOFTWARE; + best = NULL; + blocked = NULL; +again: + for (hid = 0; hid < crypto_drivers_num; hid++) { + cap = &crypto_drivers[hid]; + /* + * If it's not initialized, is in the process of + * going away, or is not appropriate (hardware + * or software based on match), then skip. + */ + if (cap->cc_dev == NULL || + (cap->cc_flags & CRYPTOCAP_F_CLEANUP) || + (cap->cc_flags & match) == 0) + continue; + + /* verify all the algorithms are supported. */ + if (kdriver_suitable(cap, krp)) { + if (best == NULL || + cap->cc_koperations < best->cc_koperations) + best = cap; + } + } + if (best != NULL) + return best; + if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) { + /* sort of an Algol 68-style for loop */ + match = CRYPTOCAP_F_SOFTWARE; + goto again; + } + return best; +} + +/* + * Dispatch an assymetric crypto request. + */ +static int +crypto_kinvoke(struct cryptkop *krp, int crid) +{ + struct cryptocap *cap = NULL; + int error; + unsigned long d_flags; + + KASSERT(krp != NULL, ("%s: krp == NULL", __func__)); + KASSERT(krp->krp_callback != NULL, + ("%s: krp->crp_callback == NULL", __func__)); + + CRYPTO_DRIVER_LOCK(); + if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) { + cap = crypto_checkdriver(crid); + if (cap != NULL) { + /* + * Driver present, it must support the necessary + * algorithm and, if s/w drivers are excluded, + * it must be registered as hardware-backed. + */ + if (!kdriver_suitable(cap, krp) || + (!crypto_devallowsoft && + (cap->cc_flags & CRYPTOCAP_F_HARDWARE) == 0)) + cap = NULL; + } + } else { + /* + * No requested driver; select based on crid flags. + */ + if (!crypto_devallowsoft) /* NB: disallow s/w drivers */ + crid &= ~CRYPTOCAP_F_SOFTWARE; + cap = crypto_select_kdriver(krp, crid); + } + if (cap != NULL && !cap->cc_kqblocked) { + krp->krp_hid = cap - crypto_drivers; + cap->cc_koperations++; + CRYPTO_DRIVER_UNLOCK(); + error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0); + CRYPTO_DRIVER_LOCK(); + if (error == ERESTART) { + cap->cc_koperations--; + CRYPTO_DRIVER_UNLOCK(); + return (error); + } + /* return the actual device used */ + krp->krp_crid = krp->krp_hid; + } else { + /* + * NB: cap is !NULL if device is blocked; in + * that case return ERESTART so the operation + * is resubmitted if possible. + */ + error = (cap == NULL) ? ENODEV : ERESTART; + } + CRYPTO_DRIVER_UNLOCK(); + + if (error) { + krp->krp_status = error; + crypto_kdone(krp); + } + return 0; +} + + +/* + * Dispatch a crypto request to the appropriate crypto devices. + */ +static int +crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint) +{ + KASSERT(crp != NULL, ("%s: crp == NULL", __func__)); + KASSERT(crp->crp_callback != NULL, + ("%s: crp->crp_callback == NULL", __func__)); + KASSERT(crp->crp_desc != NULL, ("%s: crp->crp_desc == NULL", __func__)); + + dprintk("%s()\n", __FUNCTION__); + +#ifdef CRYPTO_TIMING + if (crypto_timing) + crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp); +#endif + if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) { + struct cryptodesc *crd; + u_int64_t nid; + + /* + * Driver has unregistered; migrate the session and return + * an error to the caller so they'll resubmit the op. + * + * XXX: What if there are more already queued requests for this + * session? + */ + crypto_freesession(crp->crp_sid); + + for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next) + crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI); + + /* XXX propagate flags from initial session? */ + if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI), + CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE) == 0) + crp->crp_sid = nid; + + crp->crp_etype = EAGAIN; + crypto_done(crp); + return 0; + } else { + /* + * Invoke the driver to process the request. + */ + return CRYPTODEV_PROCESS(cap->cc_dev, crp, hint); + } +} + +/* + * Release a set of crypto descriptors. + */ +void +crypto_freereq(struct cryptop *crp) +{ + struct cryptodesc *crd; + + if (crp == NULL) + return; + +#ifdef DIAGNOSTIC + { + struct cryptop *crp2; + unsigned long q_flags; + + CRYPTO_Q_LOCK(); + TAILQ_FOREACH(crp2, &crp_q, crp_next) { + KASSERT(crp2 != crp, + ("Freeing cryptop from the crypto queue (%p).", + crp)); + } + CRYPTO_Q_UNLOCK(); + CRYPTO_RETQ_LOCK(); + TAILQ_FOREACH(crp2, &crp_ret_q, crp_next) { + KASSERT(crp2 != crp, + ("Freeing cryptop from the return queue (%p).", + crp)); + } + CRYPTO_RETQ_UNLOCK(); + } +#endif + + while ((crd = crp->crp_desc) != NULL) { + crp->crp_desc = crd->crd_next; + kmem_cache_free(cryptodesc_zone, crd); + } + kmem_cache_free(cryptop_zone, crp); +} + +/* + * Acquire a set of crypto descriptors. + */ +struct cryptop * +crypto_getreq(int num) +{ + struct cryptodesc *crd; + struct cryptop *crp; + + crp = kmem_cache_alloc(cryptop_zone, SLAB_ATOMIC); + if (crp != NULL) { + memset(crp, 0, sizeof(*crp)); + INIT_LIST_HEAD(&crp->crp_next); + init_waitqueue_head(&crp->crp_waitq); + while (num--) { + crd = kmem_cache_alloc(cryptodesc_zone, SLAB_ATOMIC); + if (crd == NULL) { + crypto_freereq(crp); + return NULL; + } + memset(crd, 0, sizeof(*crd)); + crd->crd_next = crp->crp_desc; + crp->crp_desc = crd; + } + } + return crp; +} + +/* + * Invoke the callback on behalf of the driver. + */ +void +crypto_done(struct cryptop *crp) +{ + unsigned long q_flags; + + dprintk("%s()\n", __FUNCTION__); + if ((crp->crp_flags & CRYPTO_F_DONE) == 0) { + crp->crp_flags |= CRYPTO_F_DONE; + CRYPTO_Q_LOCK(); + crypto_q_cnt--; + CRYPTO_Q_UNLOCK(); + } else + printk("crypto: crypto_done op already done, flags 0x%x", + crp->crp_flags); + if (crp->crp_etype != 0) + cryptostats.cs_errs++; + /* + * CBIMM means unconditionally do the callback immediately; + * CBIFSYNC means do the callback immediately only if the + * operation was done synchronously. Both are used to avoid + * doing extraneous context switches; the latter is mostly + * used with the software crypto driver. + */ + if ((crp->crp_flags & CRYPTO_F_CBIMM) || + ((crp->crp_flags & CRYPTO_F_CBIFSYNC) && + (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SYNC))) { + /* + * Do the callback directly. This is ok when the + * callback routine does very little (e.g. the + * /dev/crypto callback method just does a wakeup). + */ + crp->crp_callback(crp); + } else { + unsigned long r_flags; + /* + * Normal case; queue the callback for the thread. + */ + CRYPTO_RETQ_LOCK(); + if (CRYPTO_RETQ_EMPTY()) + wake_up_interruptible(&cryptoretproc_wait);/* shared wait channel */ + TAILQ_INSERT_TAIL(&crp_ret_q, crp, crp_next); + CRYPTO_RETQ_UNLOCK(); + } +} + +/* + * Invoke the callback on behalf of the driver. + */ +void +crypto_kdone(struct cryptkop *krp) +{ + struct cryptocap *cap; + unsigned long d_flags; + + if ((krp->krp_flags & CRYPTO_KF_DONE) != 0) + printk("crypto: crypto_kdone op already done, flags 0x%x", + krp->krp_flags); + krp->krp_flags |= CRYPTO_KF_DONE; + if (krp->krp_status != 0) + cryptostats.cs_kerrs++; + + CRYPTO_DRIVER_LOCK(); + /* XXX: What if driver is loaded in the meantime? */ + if (krp->krp_hid < crypto_drivers_num) { + cap = &crypto_drivers[krp->krp_hid]; + cap->cc_koperations--; + KASSERT(cap->cc_koperations >= 0, ("cc_koperations < 0")); + if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) + crypto_remove(cap); + } + CRYPTO_DRIVER_UNLOCK(); + + /* + * CBIMM means unconditionally do the callback immediately; + * This is used to avoid doing extraneous context switches + */ + if ((krp->krp_flags & CRYPTO_KF_CBIMM)) { + /* + * Do the callback directly. This is ok when the + * callback routine does very little (e.g. the + * /dev/crypto callback method just does a wakeup). + */ + krp->krp_callback(krp); + } else { + unsigned long r_flags; + /* + * Normal case; queue the callback for the thread. + */ + CRYPTO_RETQ_LOCK(); + if (CRYPTO_RETQ_EMPTY()) + wake_up_interruptible(&cryptoretproc_wait);/* shared wait channel */ + TAILQ_INSERT_TAIL(&crp_ret_kq, krp, krp_next); + CRYPTO_RETQ_UNLOCK(); + } +} + +int +crypto_getfeat(int *featp) +{ + int hid, kalg, feat = 0; + unsigned long d_flags; + + CRYPTO_DRIVER_LOCK(); + for (hid = 0; hid < crypto_drivers_num; hid++) { + const struct cryptocap *cap = &crypto_drivers[hid]; + + if ((cap->cc_flags & CRYPTOCAP_F_SOFTWARE) && + !crypto_devallowsoft) { + continue; + } + for (kalg = 0; kalg < CRK_ALGORITHM_MAX; kalg++) + if (cap->cc_kalg[kalg] & CRYPTO_ALG_FLAG_SUPPORTED) + feat |= 1 << kalg; + } + CRYPTO_DRIVER_UNLOCK(); + *featp = feat; + return (0); +} + +/* + * Crypto thread, dispatches crypto requests. + */ +static int +crypto_proc(void *arg) +{ + struct cryptop *crp, *submit; + struct cryptkop *krp, *krpp; + struct cryptocap *cap; + u_int32_t hid; + int result, hint; + unsigned long q_flags; + int loopcount = 0; + + ocf_daemonize("crypto"); + + CRYPTO_Q_LOCK(); + for (;;) { + /* + * we need to make sure we don't get into a busy loop with nothing + * to do, the two crypto_all_*blocked vars help us find out when + * we are all full and can do nothing on any driver or Q. If so we + * wait for an unblock. + */ + crypto_all_qblocked = !list_empty(&crp_q); + + /* + * Find the first element in the queue that can be + * processed and look-ahead to see if multiple ops + * are ready for the same driver. + */ + submit = NULL; + hint = 0; + list_for_each_entry(crp, &crp_q, crp_next) { + hid = CRYPTO_SESID2HID(crp->crp_sid); + cap = crypto_checkdriver(hid); + /* + * Driver cannot disappear when there is an active + * session. + */ + KASSERT(cap != NULL, ("%s:%u Driver disappeared.", + __func__, __LINE__)); + if (cap == NULL || cap->cc_dev == NULL) { + /* Op needs to be migrated, process it. */ + if (submit == NULL) + submit = crp; + break; + } + if (!cap->cc_qblocked) { + if (submit != NULL) { + /* + * We stop on finding another op, + * regardless whether its for the same + * driver or not. We could keep + * searching the queue but it might be + * better to just use a per-driver + * queue instead. + */ + if (CRYPTO_SESID2HID(submit->crp_sid) == hid) + hint = CRYPTO_HINT_MORE; + break; + } else { + submit = crp; + if ((submit->crp_flags & CRYPTO_F_BATCH) == 0) + break; + /* keep scanning for more are q'd */ + } + } + } + if (submit != NULL) { + hid = CRYPTO_SESID2HID(submit->crp_sid); + crypto_all_qblocked = 0; + list_del(&submit->crp_next); + crypto_drivers[hid].cc_unqblocked = 1; + cap = crypto_checkdriver(hid); + CRYPTO_Q_UNLOCK(); + KASSERT(cap != NULL, ("%s:%u Driver disappeared.", + __func__, __LINE__)); + result = crypto_invoke(cap, submit, hint); + CRYPTO_Q_LOCK(); + if (result == ERESTART) { + /* + * The driver ran out of resources, mark the + * driver ``blocked'' for cryptop's and put + * the request back in the queue. It would + * best to put the request back where we got + * it but that's hard so for now we put it + * at the front. This should be ok; putting + * it at the end does not work. + */ + /* XXX validate sid again? */ + list_add(&submit->crp_next, &crp_q); + cryptostats.cs_blocks++; + if (crypto_drivers[hid].cc_unqblocked) + crypto_drivers[hid].cc_qblocked=0; + crypto_drivers[hid].cc_unqblocked=0; + } + crypto_drivers[hid].cc_unqblocked = 0; + } + + crypto_all_kqblocked = !list_empty(&crp_kq); + + /* As above, but for key ops */ + krp = NULL; + list_for_each_entry(krpp, &crp_kq, krp_next) { + cap = crypto_checkdriver(krpp->krp_hid); + if (cap == NULL || cap->cc_dev == NULL) { + /* + * Operation needs to be migrated, invalidate + * the assigned device so it will reselect a + * new one below. Propagate the original + * crid selection flags if supplied. + */ + krp->krp_hid = krp->krp_crid & + (CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE); + if (krp->krp_hid == 0) + krp->krp_hid = + CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE; + break; + } + if (!cap->cc_kqblocked) { + krp = krpp; + break; + } + } + if (krp != NULL) { + crypto_all_kqblocked = 0; + list_del(&krp->krp_next); + crypto_drivers[krp->krp_hid].cc_kqblocked = 1; + CRYPTO_Q_UNLOCK(); + result = crypto_kinvoke(krp, krp->krp_hid); + CRYPTO_Q_LOCK(); + if (result == ERESTART) { + /* + * The driver ran out of resources, mark the + * driver ``blocked'' for cryptkop's and put + * the request back in the queue. It would + * best to put the request back where we got + * it but that's hard so for now we put it + * at the front. This should be ok; putting + * it at the end does not work. + */ + /* XXX validate sid again? */ + list_add(&krp->krp_next, &crp_kq); + cryptostats.cs_kblocks++; + } else + crypto_drivers[krp->krp_hid].cc_kqblocked = 0; + } + + if (submit == NULL && krp == NULL) { + /* + * Nothing more to be processed. Sleep until we're + * woken because there are more ops to process. + * This happens either by submission or by a driver + * becoming unblocked and notifying us through + * crypto_unblock. Note that when we wakeup we + * start processing each queue again from the + * front. It's not clear that it's important to + * preserve this ordering since ops may finish + * out of order if dispatched to different devices + * and some become blocked while others do not. + */ + dprintk("%s - sleeping (qe=%d qb=%d kqe=%d kqb=%d)\n", + __FUNCTION__, + list_empty(&crp_q), crypto_all_qblocked, + list_empty(&crp_kq), crypto_all_kqblocked); + loopcount = 0; + CRYPTO_Q_UNLOCK(); + crp_sleep = 1; + wait_event_interruptible(cryptoproc_wait, + !(list_empty(&crp_q) || crypto_all_qblocked) || + !(list_empty(&crp_kq) || crypto_all_kqblocked) || + cryptoproc == (pid_t) -1); + crp_sleep = 0; + if (signal_pending (current)) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + spin_lock_irq(¤t->sigmask_lock); +#endif + flush_signals(current); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + spin_unlock_irq(¤t->sigmask_lock); +#endif + } + CRYPTO_Q_LOCK(); + dprintk("%s - awake\n", __FUNCTION__); + if (cryptoproc == (pid_t) -1) + break; + cryptostats.cs_intrs++; + } else if (loopcount > crypto_max_loopcount) { + /* + * Give other processes a chance to run if we've + * been using the CPU exclusively for a while. + */ + loopcount = 0; + schedule(); + } + loopcount++; + } + CRYPTO_Q_UNLOCK(); + complete_and_exit(&cryptoproc_exited, 0); +} + +/* + * Crypto returns thread, does callbacks for processed crypto requests. + * Callbacks are done here, rather than in the crypto drivers, because + * callbacks typically are expensive and would slow interrupt handling. + */ +static int +crypto_ret_proc(void *arg) +{ + struct cryptop *crpt; + struct cryptkop *krpt; + unsigned long r_flags; + + ocf_daemonize("crypto_ret"); + + CRYPTO_RETQ_LOCK(); + for (;;) { + /* Harvest return q's for completed ops */ + crpt = NULL; + if (!list_empty(&crp_ret_q)) + crpt = list_entry(crp_ret_q.next, typeof(*crpt), crp_next); + if (crpt != NULL) + list_del(&crpt->crp_next); + + krpt = NULL; + if (!list_empty(&crp_ret_kq)) + krpt = list_entry(crp_ret_kq.next, typeof(*krpt), krp_next); + if (krpt != NULL) + list_del(&krpt->krp_next); + + if (crpt != NULL || krpt != NULL) { + CRYPTO_RETQ_UNLOCK(); + /* + * Run callbacks unlocked. + */ + if (crpt != NULL) + crpt->crp_callback(crpt); + if (krpt != NULL) + krpt->krp_callback(krpt); + CRYPTO_RETQ_LOCK(); + } else { + /* + * Nothing more to be processed. Sleep until we're + * woken because there are more returns to process. + */ + dprintk("%s - sleeping\n", __FUNCTION__); + CRYPTO_RETQ_UNLOCK(); + wait_event_interruptible(cryptoretproc_wait, + cryptoretproc == (pid_t) -1 || + !list_empty(&crp_ret_q) || + !list_empty(&crp_ret_kq)); + if (signal_pending (current)) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + spin_lock_irq(¤t->sigmask_lock); +#endif + flush_signals(current); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) + spin_unlock_irq(¤t->sigmask_lock); +#endif + } + CRYPTO_RETQ_LOCK(); + dprintk("%s - awake\n", __FUNCTION__); + if (cryptoretproc == (pid_t) -1) { + dprintk("%s - EXITING!\n", __FUNCTION__); + break; + } + cryptostats.cs_rets++; + } + } + CRYPTO_RETQ_UNLOCK(); + complete_and_exit(&cryptoretproc_exited, 0); +} + + +#if 0 /* should put this into /proc or something */ +static void +db_show_drivers(void) +{ + int hid; + + db_printf("%12s %4s %4s %8s %2s %2s\n" + , "Device" + , "Ses" + , "Kops" + , "Flags" + , "QB" + , "KB" + ); + for (hid = 0; hid < crypto_drivers_num; hid++) { + const struct cryptocap *cap = &crypto_drivers[hid]; + if (cap->cc_dev == NULL) + continue; + db_printf("%-12s %4u %4u %08x %2u %2u\n" + , device_get_nameunit(cap->cc_dev) + , cap->cc_sessions + , cap->cc_koperations + , cap->cc_flags + , cap->cc_qblocked + , cap->cc_kqblocked + ); + } +} + +DB_SHOW_COMMAND(crypto, db_show_crypto) +{ + struct cryptop *crp; + + db_show_drivers(); + db_printf("\n"); + + db_printf("%4s %8s %4s %4s %4s %4s %8s %8s\n", + "HID", "Caps", "Ilen", "Olen", "Etype", "Flags", + "Desc", "Callback"); + TAILQ_FOREACH(crp, &crp_q, crp_next) { + db_printf("%4u %08x %4u %4u %4u %04x %8p %8p\n" + , (int) CRYPTO_SESID2HID(crp->crp_sid) + , (int) CRYPTO_SESID2CAPS(crp->crp_sid) + , crp->crp_ilen, crp->crp_olen + , crp->crp_etype + , crp->crp_flags + , crp->crp_desc + , crp->crp_callback + ); + } + if (!TAILQ_EMPTY(&crp_ret_q)) { + db_printf("\n%4s %4s %4s %8s\n", + "HID", "Etype", "Flags", "Callback"); + TAILQ_FOREACH(crp, &crp_ret_q, crp_next) { + db_printf("%4u %4u %04x %8p\n" + , (int) CRYPTO_SESID2HID(crp->crp_sid) + , crp->crp_etype + , crp->crp_flags + , crp->crp_callback + ); + } + } +} + +DB_SHOW_COMMAND(kcrypto, db_show_kcrypto) +{ + struct cryptkop *krp; + + db_show_drivers(); + db_printf("\n"); + + db_printf("%4s %5s %4s %4s %8s %4s %8s\n", + "Op", "Status", "#IP", "#OP", "CRID", "HID", "Callback"); + TAILQ_FOREACH(krp, &crp_kq, krp_next) { + db_printf("%4u %5u %4u %4u %08x %4u %8p\n" + , krp->krp_op + , krp->krp_status + , krp->krp_iparams, krp->krp_oparams + , krp->krp_crid, krp->krp_hid + , krp->krp_callback + ); + } + if (!TAILQ_EMPTY(&crp_ret_q)) { + db_printf("%4s %5s %8s %4s %8s\n", + "Op", "Status", "CRID", "HID", "Callback"); + TAILQ_FOREACH(krp, &crp_ret_kq, krp_next) { + db_printf("%4u %5u %08x %4u %8p\n" + , krp->krp_op + , krp->krp_status + , krp->krp_crid, krp->krp_hid + , krp->krp_callback + ); + } + } +} +#endif + + +static int +crypto_init(void) +{ + int error; + + dprintk("%s(%p)\n", __FUNCTION__, (void *) crypto_init); + + if (crypto_initted) + return 0; + crypto_initted = 1; + + spin_lock_init(&crypto_drivers_lock); + spin_lock_init(&crypto_q_lock); + spin_lock_init(&crypto_ret_q_lock); + + cryptop_zone = kmem_cache_create("cryptop", sizeof(struct cryptop), + 0, SLAB_HWCACHE_ALIGN, NULL +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) + , NULL +#endif + ); + + cryptodesc_zone = kmem_cache_create("cryptodesc", sizeof(struct cryptodesc), + 0, SLAB_HWCACHE_ALIGN, NULL +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) + , NULL +#endif + ); + + if (cryptodesc_zone == NULL || cryptop_zone == NULL) { + printk("crypto: crypto_init cannot setup crypto zones\n"); + error = ENOMEM; + goto bad; + } + + crypto_drivers_num = CRYPTO_DRIVERS_INITIAL; + crypto_drivers = kmalloc(crypto_drivers_num * sizeof(struct cryptocap), + GFP_KERNEL); + if (crypto_drivers == NULL) { + printk("crypto: crypto_init cannot setup crypto drivers\n"); + error = ENOMEM; + goto bad; + } + + memset(crypto_drivers, 0, crypto_drivers_num * sizeof(struct cryptocap)); + + init_completion(&cryptoproc_exited); + init_completion(&cryptoretproc_exited); + + cryptoproc = 0; /* to avoid race condition where proc runs first */ + cryptoproc = kernel_thread(crypto_proc, NULL, CLONE_FS|CLONE_FILES); + if (cryptoproc < 0) { + error = cryptoproc; + printk("crypto: crypto_init cannot start crypto thread; error %d", + error); + goto bad; + } + + cryptoretproc = 0; /* to avoid race condition where proc runs first */ + cryptoretproc = kernel_thread(crypto_ret_proc, NULL, CLONE_FS|CLONE_FILES); + if (cryptoretproc < 0) { + error = cryptoretproc; + printk("crypto: crypto_init cannot start cryptoret thread; error %d", + error); + goto bad; + } + + return 0; +bad: + crypto_exit(); + return error; +} + + +static void +crypto_exit(void) +{ + pid_t p; + unsigned long d_flags; + + dprintk("%s()\n", __FUNCTION__); + + /* + * Terminate any crypto threads. + */ + + CRYPTO_DRIVER_LOCK(); + p = cryptoproc; + cryptoproc = (pid_t) -1; + kill_proc(p, SIGTERM, 1); + wake_up_interruptible(&cryptoproc_wait); + CRYPTO_DRIVER_UNLOCK(); + + wait_for_completion(&cryptoproc_exited); + + CRYPTO_DRIVER_LOCK(); + p = cryptoretproc; + cryptoretproc = (pid_t) -1; + kill_proc(p, SIGTERM, 1); + wake_up_interruptible(&cryptoretproc_wait); + CRYPTO_DRIVER_UNLOCK(); + + wait_for_completion(&cryptoretproc_exited); + + /* XXX flush queues??? */ + + /* + * Reclaim dynamically allocated resources. + */ + if (crypto_drivers != NULL) + kfree(crypto_drivers); + + if (cryptodesc_zone != NULL) + kmem_cache_destroy(cryptodesc_zone); + if (cryptop_zone != NULL) + kmem_cache_destroy(cryptop_zone); +} + + +EXPORT_SYMBOL(crypto_newsession); +EXPORT_SYMBOL(crypto_freesession); +EXPORT_SYMBOL(crypto_get_driverid); +EXPORT_SYMBOL(crypto_kregister); +EXPORT_SYMBOL(crypto_register); +EXPORT_SYMBOL(crypto_unregister); +EXPORT_SYMBOL(crypto_unregister_all); +EXPORT_SYMBOL(crypto_unblock); +EXPORT_SYMBOL(crypto_dispatch); +EXPORT_SYMBOL(crypto_kdispatch); +EXPORT_SYMBOL(crypto_freereq); +EXPORT_SYMBOL(crypto_getreq); +EXPORT_SYMBOL(crypto_done); +EXPORT_SYMBOL(crypto_kdone); +EXPORT_SYMBOL(crypto_getfeat); +EXPORT_SYMBOL(crypto_userasymcrypto); +EXPORT_SYMBOL(crypto_getcaps); +EXPORT_SYMBOL(crypto_find_driver); +EXPORT_SYMBOL(crypto_find_device_byhid); + +module_init(crypto_init); +module_exit(crypto_exit); + +MODULE_LICENSE("BSD"); +MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>"); +MODULE_DESCRIPTION("OCF (OpenBSD Cryptographic Framework)"); |