Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / crypto / api.c

diff --git a/crypto/api.c b/crypto/api.c
index 394169a..a5317b2 100644 (file)
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
  * and Nettle, by Niels Möller.
@@ -13,11 +14,16 @@
  * any later version.
  *
  */
+
+#include <linux/compiler.h>
 #include <linux/init.h>
 #include <linux/crypto.h>
 #include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
 #include <linux/rwsem.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include "internal.h"
 
 LIST_HEAD(crypto_alg_list);
@@ -33,9 +39,10 @@ static inline void crypto_alg_put(struct crypto_alg *alg)
        module_put(alg->cra_module);
 }
 
-struct crypto_alg *crypto_alg_lookup(const char *name)
+static struct crypto_alg *crypto_alg_lookup(const char *name)
 {
        struct crypto_alg *q, *alg = NULL;
+       int best = -1;
 
        if (!name)
                return NULL;
@@ -43,20 +50,40 @@ struct crypto_alg *crypto_alg_lookup(const char *name)
        down_read(&crypto_alg_sem);
        
        list_for_each_entry(q, &crypto_alg_list, cra_list) {
-               if (!(strcmp(q->cra_name, name))) {
-                       if (crypto_alg_get(q))
-                               alg = q;
+               int exact, fuzzy;
+
+               exact = !strcmp(q->cra_driver_name, name);
+               fuzzy = !strcmp(q->cra_name, name);
+               if (!exact && !(fuzzy && q->cra_priority > best))
+                       continue;
+
+               if (unlikely(!crypto_alg_get(q)))
+                       continue;
+
+               best = q->cra_priority;
+               if (alg)
+                       crypto_alg_put(alg);
+               alg = q;
+
+               if (exact)
                        break;
-               }
        }
        
        up_read(&crypto_alg_sem);
        return alg;
 }
 
+/* A far more intelligent version of this is planned.  For now, just
+ * try an exact match on the name of the algorithm. */
+static inline struct crypto_alg *crypto_alg_mod_lookup(const char *name)
+{
+       return try_then_request_module(crypto_alg_lookup(name), name);
+}
+
 static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
 {
-       tfm->crt_flags = 0;
+       tfm->crt_flags = flags & CRYPTO_TFM_REQ_MASK;
+       flags &= ~CRYPTO_TFM_REQ_MASK;
        
        switch (crypto_tfm_alg_type(tfm)) {
        case CRYPTO_ALG_TYPE_CIPHER:
@@ -117,21 +144,52 @@ static void crypto_exit_ops(struct crypto_tfm *tfm)
        }
 }
 
-struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
+static unsigned int crypto_ctxsize(struct crypto_alg *alg, int flags)
+{
+       unsigned int len;
+
+       switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
+       default:
+               BUG();
+
+       case CRYPTO_ALG_TYPE_CIPHER:
+               len = crypto_cipher_ctxsize(alg, flags);
+               break;
+               
+       case CRYPTO_ALG_TYPE_DIGEST:
+               len = crypto_digest_ctxsize(alg, flags);
+               break;
+               
+       case CRYPTO_ALG_TYPE_COMPRESS:
+               len = crypto_compress_ctxsize(alg, flags);
+               break;
+       }
+
+       return len + (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+}
+
+struct crypto_tfm *crypto_alloc_tfm2(const char *name, u32 flags,
+                                    int nomodload)
 {
        struct crypto_tfm *tfm = NULL;
        struct crypto_alg *alg;
+       unsigned int tfm_size;
+
+       if (!nomodload) {
+               alg = crypto_alg_mod_lookup(name);
+       }
+       else {
+               alg = crypto_alg_lookup(name);
+       }
 
-       alg = crypto_alg_mod_lookup(name);
        if (alg == NULL)
                goto out;
-       
-       tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
+
+       tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, flags);
+       tfm = kzalloc(tfm_size, GFP_KERNEL);
        if (tfm == NULL)
                goto out_put;
 
-       memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
-       
        tfm->__crt_alg = alg;
        
        if (crypto_init_flags(tfm, flags))
@@ -153,10 +211,21 @@ out:
        return tfm;
 }
 
+struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
+{
+       return crypto_alloc_tfm2(name, flags, 0);
+}
+
 void crypto_free_tfm(struct crypto_tfm *tfm)
 {
-       struct crypto_alg *alg = tfm->__crt_alg;
-       int size = sizeof(*tfm) + alg->cra_ctxsize;
+       struct crypto_alg *alg;
+       int size;
+
+       if (unlikely(!tfm))
+               return;
+
+       alg = tfm->__crt_alg;
+       size = sizeof(*tfm) + alg->cra_ctxsize;
 
        crypto_exit_ops(tfm);
        crypto_alg_put(alg);
@@ -164,15 +233,48 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
        kfree(tfm);
 }
 
+static inline int crypto_set_driver_name(struct crypto_alg *alg)
+{
+       static const char suffix[] = "-generic";
+       char *driver_name = (char *)alg->cra_driver_name;
+       int len;
+
+       if (*driver_name)
+               return 0;
+
+       len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+       if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
+               return -ENAMETOOLONG;
+
+       memcpy(driver_name + len, suffix, sizeof(suffix));
+       return 0;
+}
+
 int crypto_register_alg(struct crypto_alg *alg)
 {
-       int ret = 0;
+       int ret;
        struct crypto_alg *q;
+
+       if (alg->cra_alignmask & (alg->cra_alignmask + 1))
+               return -EINVAL;
+
+       if (alg->cra_alignmask & alg->cra_blocksize)
+               return -EINVAL;
+
+       if (alg->cra_blocksize > PAGE_SIZE / 8)
+               return -EINVAL;
+
+       if (alg->cra_priority < 0)
+               return -EINVAL;
        
+       ret = crypto_set_driver_name(alg);
+       if (unlikely(ret))
+               return ret;
+
        down_write(&crypto_alg_sem);
        
        list_for_each_entry(q, &crypto_alg_list, cra_list) {
-               if (!(strcmp(q->cra_name, alg->cra_name))) {
+               if (!strcmp(q->cra_driver_name, alg->cra_driver_name)) {
                        ret = -EEXIST;
                        goto out;
                }