diff options
Diffstat (limited to 'target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c')
| -rw-r--r-- | target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c b/target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c new file mode 100644 index 000000000..9cf3f6e02 --- /dev/null +++ b/target/linux/generic/files/crypto/ocf/ocfnull/ocfnull.c @@ -0,0 +1,204 @@ +/* + * An OCF module for determining the cost of crypto versus the cost of + * IPSec processing outside of OCF. This modules gives us the effect of + * zero cost encryption, of course you will need to run it at both ends + * since it does no crypto at all. + * + * Written by David McCullough <david_mccullough@mcafee.com> + * Copyright (C) 2006-2010 David McCullough + * + * LICENSE TERMS + * + * The free distribution and use of this software in both source and binary + * form is allowed (with or without changes) provided that: + * + * 1. distributions of this source code include the above copyright + * notice, this list of conditions and the following disclaimer; + * + * 2. distributions in binary form include the above copyright + * notice, this list of conditions and the following disclaimer + * in the documentation and/or other associated materials; + * + * 3. the copyright holder's name is not used to endorse products + * built using this software without specific written permission. + * + * ALTERNATIVELY, provided that this notice is retained in full, this product + * may be distributed under the terms of the GNU General Public License (GPL), + * in which case the provisions of the GPL apply INSTEAD OF those given above. + * + * DISCLAIMER + * + * This software is provided 'as is' with no explicit or implied warranties + * in respect of its properties, including, but not limited to, correctness + * and/or fitness for purpose. + */ + +#include <linux/version.h> +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(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/sched.h> +#include <linux/wait.h> +#include <linux/crypto.h> +#include <linux/interrupt.h> + +#include <cryptodev.h> +#include <uio.h> + +static int32_t null_id = -1; +static u_int32_t null_sesnum = 0; + +static int null_process(device_t, struct cryptop *, int); +static int null_newsession(device_t, u_int32_t *, struct cryptoini *); +static int null_freesession(device_t, u_int64_t); + +#define debug ocfnull_debug +int ocfnull_debug = 0; +module_param(ocfnull_debug, int, 0644); +MODULE_PARM_DESC(ocfnull_debug, "Enable debug"); + +/* + * dummy device structure + */ + +static struct { + softc_device_decl sc_dev; +} nulldev; + +static device_method_t null_methods = { + /* crypto device methods */ + DEVMETHOD(cryptodev_newsession, null_newsession), + DEVMETHOD(cryptodev_freesession,null_freesession), + DEVMETHOD(cryptodev_process, null_process), +}; + +/* + * Generate a new software session. + */ +static int +null_newsession(device_t arg, u_int32_t *sid, struct cryptoini *cri) +{ + dprintk("%s()\n", __FUNCTION__); + if (sid == NULL || cri == NULL) { + dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__); + return EINVAL; + } + + if (null_sesnum == 0) + null_sesnum++; + *sid = null_sesnum++; + return 0; +} + + +/* + * Free a session. + */ +static int +null_freesession(device_t arg, u_int64_t tid) +{ + u_int32_t sid = CRYPTO_SESID2LID(tid); + + dprintk("%s()\n", __FUNCTION__); + if (sid > null_sesnum) { + dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); + return EINVAL; + } + + /* Silently accept and return */ + if (sid == 0) + return 0; + return 0; +} + + +/* + * Process a request. + */ +static int +null_process(device_t arg, struct cryptop *crp, int hint) +{ + unsigned int lid; + + dprintk("%s()\n", __FUNCTION__); + + /* Sanity check */ + if (crp == NULL) { + dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); + return EINVAL; + } + + crp->crp_etype = 0; + + if (crp->crp_desc == NULL || crp->crp_buf == NULL) { + dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); + crp->crp_etype = EINVAL; + goto done; + } + + /* + * find the session we are using + */ + + lid = crp->crp_sid & 0xffffffff; + if (lid >= null_sesnum || lid == 0) { + crp->crp_etype = ENOENT; + dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__); + goto done; + } + +done: + crypto_done(crp); + return 0; +} + + +/* + * our driver startup and shutdown routines + */ + +static int +null_init(void) +{ + dprintk("%s(%p)\n", __FUNCTION__, null_init); + + memset(&nulldev, 0, sizeof(nulldev)); + softc_device_init(&nulldev, "ocfnull", 0, null_methods); + + null_id = crypto_get_driverid(softc_get_device(&nulldev), + CRYPTOCAP_F_HARDWARE); + if (null_id < 0) + panic("ocfnull: crypto device cannot initialize!"); + +#define REGISTER(alg) \ + crypto_register(null_id,alg,0,0) + REGISTER(CRYPTO_DES_CBC); + REGISTER(CRYPTO_3DES_CBC); + REGISTER(CRYPTO_RIJNDAEL128_CBC); + REGISTER(CRYPTO_MD5); + REGISTER(CRYPTO_SHA1); + REGISTER(CRYPTO_MD5_HMAC); + REGISTER(CRYPTO_SHA1_HMAC); +#undef REGISTER + + return 0; +} + +static void +null_exit(void) +{ + dprintk("%s()\n", __FUNCTION__); + crypto_unregister_all(null_id); + null_id = -1; +} + +module_init(null_init); +module_exit(null_exit); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>"); +MODULE_DESCRIPTION("ocfnull - claims a lot but does nothing"); |