[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@xxxxxxxxxxxxxxxxxxx>
---
include/net/esp.h | 2 +-
net/ipv4/Kconfig | 1 +
net/ipv4/esp4.c | 49 +++++++++++++++++++++++++++++--------------------
net/ipv6/Kconfig | 1 +
net/ipv6/esp6.c | 48 ++++++++++++++++++++++++++++--------------------
net/xfrm/xfrm_algo.c | 24 ++++++++++++++++--------
6 files changed, 76 insertions(+), 49 deletions(-)
diff --git a/include/net/esp.h b/include/net/esp.h
--- a/include/net/esp.h
+++ b/include/net/esp.h
@@ -22,7 +22,7 @@ struct esp_data
* >= crypto_tfm_alg_ivsize(tfm). */
int ivlen;
int padlen; /* 0..255 */
- struct crypto_tfm *tfm; /* crypto handle */
+ struct crypto_blkcipher *tfm; /* crypto handle */
} conf;
/* Integrity. It is active when icv_full_len != 0 */
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -386,6 +386,7 @@ config INET_ESP
select CRYPTO
select CRYPTO_HMAC
select CRYPTO_MD5
+ select CRYPTO_CBC
select CRYPTO_SHA1
select CRYPTO_DES
---help---
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -1,3 +1,4 @@
+#include <linux/err.h>
#include <linux/module.h>
#include <net/ip.h>
#include <net/xfrm.h>
@@ -16,7 +17,8 @@ static int esp_output(struct xfrm_state
int err;
struct iphdr *top_iph;
struct ip_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;
@@ -36,7 +38,9 @@ static int esp_output(struct xfrm_state
esp = x->data;
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);
@@ -92,7 +96,7 @@ static int esp_output(struct xfrm_state
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];
@@ -103,14 +107,17 @@ static int esp_output(struct xfrm_state
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) {
@@ -121,8 +128,6 @@ static int esp_output(struct xfrm_state
ip_send_check(top_iph);
- err = 0;
-
error:
return err;
}
@@ -137,8 +142,10 @@ static int esp_input(struct xfrm_state *
struct iphdr *iph;
struct ip_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 ip_esp_hdr) - esp->conf.ivlen - alen;
int nfrags;
@@ -146,6 +153,7 @@ static int esp_input(struct xfrm_state *
u8 nexthdr[2];
struct scatterlist *sg;
int padlen;
+ int err;
if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
goto out;
@@ -178,7 +186,7 @@ static int esp_input(struct xfrm_state *
/* 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);
sg = &esp->sgbuf[0];
@@ -188,9 +196,11 @@ static int esp_input(struct xfrm_state *
goto out;
}
skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
- crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
+ err = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
if (unlikely(sg != &esp->sgbuf[0]))
kfree(sg);
+ if (unlikely(err))
+ return err;
if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
BUG();
@@ -254,7 +264,7 @@ out:
static u32 esp4_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);
@@ -293,7 +303,7 @@ static void esp_destroy(struct xfrm_stat
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;
@@ -307,6 +317,7 @@ static void esp_destroy(struct xfrm_stat
static int esp_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) {
@@ -353,13 +364,11 @@ static int esp_init_state(struct xfrm_st
}
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);
@@ -367,7 +376,7 @@ static int esp_init_state(struct xfrm_st
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 ip_esp_hdr) + esp->conf.ivlen;
if (x->props.mode)
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -77,6 +77,7 @@ config INET6_ESP
select CRYPTO
select CRYPTO_HMAC
select CRYPTO_MD5
+ select CRYPTO_CBC
select CRYPTO_SHA1
select CRYPTO_DES
---help---
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
--- 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
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
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
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
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
pskb_put(skb, trailer, alen);
}
- err = 0;
-
error:
return err;
}
@@ -134,8 +139,10 @@ static int esp6_input(struct xfrm_state
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
/* 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
}
}
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_sta
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_sta
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_s
}
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_s
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)
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -118,7 +118,8 @@ static struct xfrm_algo_desc aalg_list[]
static struct xfrm_algo_desc ealg_list[] = {
{
- .name = "cipher_null",
+ .name = "ecb(cipher_null)",
+ .compat = "cipher_null",
.uinfo = {
.encr = {
@@ -135,7 +136,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "des",
+ .name = "cbc(des)",
+ .compat = "des",
.uinfo = {
.encr = {
@@ -152,7 +154,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "des3_ede",
+ .name = "cbc(des3_ede)",
+ .compat = "des3_ede",
.uinfo = {
.encr = {
@@ -169,7 +172,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "cast128",
+ .name = "cbc(cast128)",
+ .compat = "cast128",
.uinfo = {
.encr = {
@@ -186,7 +190,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "blowfish",
+ .name = "cbc(blowfish)",
+ .compat = "blowfish",
.uinfo = {
.encr = {
@@ -203,7 +208,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "aes",
+ .name = "cbc(aes)",
+ .compat = "aes",
.uinfo = {
.encr = {
@@ -220,7 +226,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "serpent",
+ .name = "cbc(serpent)",
+ .compat = "serpent",
.uinfo = {
.encr = {
@@ -237,7 +244,8 @@ static struct xfrm_algo_desc ealg_list[]
}
},
{
- .name = "twofish",
+ .name = "cbc(twofish)",
+ .compat = "twofish",
.uinfo = {
.encr = {
-
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