cryptomgr.c

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    1 /*
    2  * Create default crypto algorithm instances.
    3  *
    4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
    5  *
    6  * This program is free software; you can redistribute it and/or modify it
    7  * under the terms of the GNU General Public License as published by the Free
    8  * Software Foundation; either version 2 of the License, or (at your option)
    9  * any later version.
   10  *
   11  */
   12 
   13 #include <linux/crypto.h>
   14 #include <linux/ctype.h>
   15 #include <linux/err.h>
   16 #include <linux/init.h>
   17 #include <linux/kthread.h>
   18 #include <linux/module.h>
   19 #include <linux/notifier.h>
   20 #include <linux/rtnetlink.h>
   21 #include <linux/sched.h>
   22 #include <linux/string.h>
   23 
   24 #include "internal.h"
   25 
   26 struct cryptomgr_param {
   27         struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
   28 
   29         struct {
   30                 struct rtattr attr;
   31                 struct crypto_attr_type data;
   32         } type;
   33 
   34         union {
   35                 struct rtattr attr;
   36                 struct {
   37                         struct rtattr attr;
   38                         struct crypto_attr_alg data;
   39                 } alg;
   40                 struct {
   41                         struct rtattr attr;
   42                         struct crypto_attr_u32 data;
   43                 } nu32;
   44         } attrs[CRYPTO_MAX_ATTRS];
   45 
   46         char larval[CRYPTO_MAX_ALG_NAME];
   47         char template[CRYPTO_MAX_ALG_NAME];
   48 };
   49 
   50 static int cryptomgr_probe(void *data)
   51 {
   52         struct cryptomgr_param *param = data;
   53         struct crypto_template *tmpl;
   54         struct crypto_instance *inst;
   55         int err;
   56 
   57         tmpl = crypto_lookup_template(param->template);
   58         if (!tmpl)
   59                 goto err;
   60 
   61         do {
   62                 inst = tmpl->alloc(param->tb);
   63                 if (IS_ERR(inst))
   64                         err = PTR_ERR(inst);
   65                 else if ((err = crypto_register_instance(tmpl, inst)))
   66                         tmpl->free(inst);
   67         } while (err == -EAGAIN && !signal_pending(current));
   68 
   69         crypto_tmpl_put(tmpl);
   70 
   71         if (err)
   72                 goto err;
   73 
   74 out:
   75         kfree(param);
   76         module_put_and_exit(0);
   77 
   78 err:
   79         crypto_larval_error(param->larval, param->type.data.type,
   80                             param->type.data.mask);
   81         goto out;
   82 }
   83 
   84 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
   85 {
   86         struct task_struct *thread;
   87         struct cryptomgr_param *param;
   88         const char *name = larval->alg.cra_name;
   89         const char *p;
   90         unsigned int len;
   91         int i;
   92 
   93         if (!try_module_get(THIS_MODULE))
   94                 goto err;
   95 
   96         param = kzalloc(sizeof(*param), GFP_KERNEL);
   97         if (!param)
   98                 goto err_put_module;
   99 
  100         for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
  101                 ;
  102 
  103         len = p - name;
  104         if (!len || *p != '(')
  105                 goto err_free_param;
  106 
  107         memcpy(param->template, name, len);
  108 
  109         i = 0;
  110         for (;;) {
  111                 int notnum = 0;
  112 
  113                 name = ++p;
  114                 len = 0;
  115 
  116                 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
  117                         notnum |= !isdigit(*p);
  118 
  119                 if (*p == '(') {
  120                         int recursion = 0;
  121 
  122                         for (;;) {
  123                                 if (!*++p)
  124                                         goto err_free_param;
  125                                 if (*p == '(')
  126                                         recursion++;
  127                                 else if (*p == ')' && !recursion--)
  128                                         break;
  129                         }
  130 
  131                         notnum = 1;
  132                         p++;
  133                 }
  134 
  135                 len = p - name;
  136                 if (!len)
  137                         goto err_free_param;
  138 
  139                 if (notnum) {
  140                         param->attrs[i].alg.attr.rta_len =
  141                                 sizeof(param->attrs[i].alg);
  142                         param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
  143                         memcpy(param->attrs[i].alg.data.name, name, len);
  144                 } else {
  145                         param->attrs[i].nu32.attr.rta_len =
  146                                 sizeof(param->attrs[i].nu32);
  147                         param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
  148                         param->attrs[i].nu32.data.num =
  149                                 simple_strtol(name, NULL, 0);
  150                 }
  151 
  152                 param->tb[i + 1] = &param->attrs[i].attr;
  153                 i++;
  154 
  155                 if (i >= CRYPTO_MAX_ATTRS)
  156                         goto err_free_param;
  157 
  158                 if (*p == ')')
  159                         break;
  160 
  161                 if (*p != ',')
  162                         goto err_free_param;
  163         }
  164 
  165         if (!i)
  166                 goto err_free_param;
  167 
  168         param->tb[i + 1] = NULL;
  169 
  170         param->type.attr.rta_len = sizeof(param->type);
  171         param->type.attr.rta_type = CRYPTOA_TYPE;
  172         param->type.data.type = larval->alg.cra_flags;
  173         param->type.data.mask = larval->mask;
  174         param->tb[0] = &param->type.attr;
  175 
  176         memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
  177 
  178         thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
  179         if (IS_ERR(thread))
  180                 goto err_free_param;
  181 
  182         return NOTIFY_STOP;
  183 
  184 err_free_param:
  185         kfree(param);
  186 err_put_module:
  187         module_put(THIS_MODULE);
  188 err:
  189         return NOTIFY_OK;
  190 }
  191 
  192 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
  193                             void *data)
  194 {
  195         switch (msg) {
  196         case CRYPTO_MSG_ALG_REQUEST:
  197                 return cryptomgr_schedule_probe(data);
  198         }
  199 
  200         return NOTIFY_DONE;
  201 }
  202 
  203 static struct notifier_block cryptomgr_notifier = {
  204         .notifier_call = cryptomgr_notify,
  205 };
  206 
  207 static int __init cryptomgr_init(void)
  208 {
  209         return crypto_register_notifier(&cryptomgr_notifier);
  210 }
  211 
  212 static void __exit cryptomgr_exit(void)
  213 {
  214         int err = crypto_unregister_notifier(&cryptomgr_notifier);
  215         BUG_ON(err);
  216 }
  217 
  218 module_init(cryptomgr_init);
  219 module_exit(cryptomgr_exit);
  220 
  221 MODULE_LICENSE("GPL");
  222 MODULE_DESCRIPTION("Crypto Algorithm Manager");

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FreeBSD/Linux Kernel Cross Reference sys/crypto/cryptomgr.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/cryptomgr.c