[IPSEC] ESP: Use block ciphers where applicable

This patch converts IPSec/ESP to use the new block cipher type where
applicable.  Similar to the HMAC conversion, existing algorithm names
have been kept for compatibility.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 28 insertions, 20 deletions

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index a278d5e862fe..46a7e687948e 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -24,6 +24,7 @@
  *      This file is derived from net/ipv4/esp.c
  */
 
+#include <linux/err.h>
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
@@ -44,7 +45,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
         int hdr_len;
         struct ipv6hdr *top_iph;
         struct ipv6_esp_hdr *esph;
-        struct crypto_tfm *tfm;
+        struct crypto_blkcipher *tfm;
+        struct blkcipher_desc desc;
         struct esp_data *esp;
         struct sk_buff *trailer;
         int blksize;
@@ -67,7 +69,9 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 
         alen = esp->auth.icv_trunc_len;
         tfm = esp->conf.tfm;
-        blksize = ALIGN(crypto_tfm_alg_blocksize(tfm), 4);
+        desc.tfm = tfm;
+        desc.flags = 0;
+        blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
         clen = ALIGN(clen + 2, blksize);
         if (esp->conf.padlen)
                 clen = ALIGN(clen, esp->conf.padlen);
@@ -96,7 +100,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
         xfrm_aevent_doreplay(x);
 
         if (esp->conf.ivlen)
-                crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
+                crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
 
         do {
                 struct scatterlist *sg = &esp->sgbuf[0];
@@ -107,14 +111,17 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
                                 goto error;
                 }
                 skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
-                crypto_cipher_encrypt(tfm, sg, sg, clen);
+                err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
                 if (unlikely(sg != &esp->sgbuf[0]))
                         kfree(sg);
         } while (0);
 
+        if (unlikely(err))
+                goto error;
+
         if (esp->conf.ivlen) {
-                memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
-                crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
+                memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
+                crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
         }
 
         if (esp->auth.icv_full_len) {
@@ -123,8 +130,6 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
                 pskb_put(skb, trailer, alen);
         }
 
-        err = 0;
-
 error:
         return err;
 }
@@ -134,8 +139,10 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
         struct ipv6hdr *iph;
         struct ipv6_esp_hdr *esph;
         struct esp_data *esp = x->data;
+        struct crypto_blkcipher *tfm = esp->conf.tfm;
+        struct blkcipher_desc desc = { .tfm = tfm };
         struct sk_buff *trailer;
-        int blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
+        int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
         int alen = esp->auth.icv_trunc_len;
         int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;
 
@@ -182,7 +189,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
 
         /* Get ivec. This can be wrong, check against another impls. */
         if (esp->conf.ivlen)
-                crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm));
+                crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
 
         {
                 u8 nexthdr[2];
@@ -197,9 +204,11 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
                         }
                 }
                 skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen);
-                crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
+                ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
                 if (unlikely(sg != &esp->sgbuf[0]))
                         kfree(sg);
+                if (unlikely(ret))
+                        goto out;
 
                 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
                         BUG();
@@ -225,7 +234,7 @@ out:
 static u32 esp6_get_max_size(struct xfrm_state *x, int mtu)
 {
         struct esp_data *esp = x->data;
-        u32 blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
+        u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
 
         if (x->props.mode) {
                 mtu = ALIGN(mtu + 2, blksize);
@@ -266,7 +275,7 @@ static void esp6_destroy(struct xfrm_state *x)
         if (!esp)
                 return;
 
-        crypto_free_tfm(esp->conf.tfm);
+        crypto_free_blkcipher(esp->conf.tfm);
         esp->conf.tfm = NULL;
         kfree(esp->conf.ivec);
         esp->conf.ivec = NULL;
@@ -280,6 +289,7 @@ static void esp6_destroy(struct xfrm_state *x)
 static int esp6_init_state(struct xfrm_state *x)
 {
         struct esp_data *esp = NULL;
+        struct crypto_blkcipher *tfm;
 
         /* null auth and encryption can have zero length keys */
         if (x->aalg) {
@@ -327,13 +337,11 @@ static int esp6_init_state(struct xfrm_state *x)
         }
         esp->conf.key = x->ealg->alg_key;
         esp->conf.key_len = (x->ealg->alg_key_len+7)/8;
-        if (x->props.ealgo == SADB_EALG_NULL)
-                esp->conf.tfm = crypto_alloc_tfm(x->ealg->alg_name, CRYPTO_TFM_MODE_ECB);
-        else
-                esp->conf.tfm = crypto_alloc_tfm(x->ealg->alg_name, CRYPTO_TFM_MODE_CBC);
-        if (esp->conf.tfm == NULL)
+        tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
+        if (IS_ERR(tfm))
                 goto error;
-        esp->conf.ivlen = crypto_tfm_alg_ivsize(esp->conf.tfm);
+        esp->conf.tfm = tfm;
+        esp->conf.ivlen = crypto_blkcipher_ivsize(tfm);
         esp->conf.padlen = 0;
         if (esp->conf.ivlen) {
                 esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
@@ -341,7 +349,7 @@ static int esp6_init_state(struct xfrm_state *x)
                         goto error;
                 get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
         }
-        if (crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len))
+        if (crypto_blkcipher_setkey(tfm, esp->conf.key, esp->conf.key_len))
                 goto error;
         x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
         if (x->props.mode)