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authorHerbert Xu <herbert@gondor.apana.org.au>2008-01-28 19:37:29 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-31 19:27:03 -0800
commit1a6509d991225ad210de54c63314fd9542922095 (patch)
treeafe5c560388558bebd3e21b7c6f789a28a323a51 /net/ipv6/esp6.c
parent6fbf2cb77461a0cd0675228d20dd0f70d7b2251f (diff)
downloadlinux-2.6.38-lt-ux500-1a6509d991225ad210de54c63314fd9542922095.tar.gz
[IPSEC]: Add support for combined mode algorithms
This patch adds support for combined mode algorithms with GCM being the first algorithm supported. Combined mode algorithms can be added through the xfrm_user interface using the new algorithm payload type XFRMA_ALG_AEAD. Each algorithms is identified by its name and the ICV length. For the purposes of matching algorithms in xfrm_tmpl structures, combined mode algorithms occupy the same name space as encryption algorithms. This is in line with how they are negotiated using IKE. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/esp6.c')
-rw-r--r--net/ipv6/esp6.c77
1 files changed, 61 insertions, 16 deletions
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index dc821acf3d3..ca48c56c4b1 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -382,35 +382,53 @@ static void esp6_destroy(struct xfrm_state *x)
kfree(esp);
}
-static int esp6_init_state(struct xfrm_state *x)
+static int esp_init_aead(struct xfrm_state *x)
+{
+ struct esp_data *esp = x->data;
+ struct crypto_aead *aead;
+ int err;
+
+ aead = crypto_alloc_aead(x->aead->alg_name, 0, 0);
+ err = PTR_ERR(aead);
+ if (IS_ERR(aead))
+ goto error;
+
+ esp->aead = aead;
+
+ err = crypto_aead_setkey(aead, x->aead->alg_key,
+ (x->aead->alg_key_len + 7) / 8);
+ if (err)
+ goto error;
+
+ err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
+ if (err)
+ goto error;
+
+error:
+ return err;
+}
+
+static int esp_init_authenc(struct xfrm_state *x)
{
- struct esp_data *esp = NULL;
+ struct esp_data *esp = x->data;
struct crypto_aead *aead;
struct crypto_authenc_key_param *param;
struct rtattr *rta;
char *key;
char *p;
char authenc_name[CRYPTO_MAX_ALG_NAME];
- u32 align;
unsigned int keylen;
int err;
+ err = -EINVAL;
if (x->ealg == NULL)
- return -EINVAL;
-
- if (x->encap)
- return -EINVAL;
+ goto error;
+ err = -ENAMETOOLONG;
if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)",
x->aalg ? x->aalg->alg_name : "digest_null",
x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME)
- return -ENAMETOOLONG;
-
- esp = kzalloc(sizeof(*esp), GFP_KERNEL);
- if (esp == NULL)
- return -ENOMEM;
-
- x->data = esp;
+ goto error;
aead = crypto_alloc_aead(authenc_name, 0, 0);
err = PTR_ERR(aead);
@@ -458,8 +476,6 @@ static int esp6_init_state(struct xfrm_state *x)
goto free_key;
}
- esp->padlen = 0;
-
param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
@@ -468,9 +484,38 @@ static int esp6_init_state(struct xfrm_state *x)
free_key:
kfree(key);
+error:
+ return err;
+}
+
+static int esp6_init_state(struct xfrm_state *x)
+{
+ struct esp_data *esp;
+ struct crypto_aead *aead;
+ u32 align;
+ int err;
+
+ if (x->encap)
+ return -EINVAL;
+
+ esp = kzalloc(sizeof(*esp), GFP_KERNEL);
+ if (esp == NULL)
+ return -ENOMEM;
+
+ x->data = esp;
+
+ if (x->aead)
+ err = esp_init_aead(x);
+ else
+ err = esp_init_authenc(x);
+
if (err)
goto error;
+ aead = esp->aead;
+
+ esp->padlen = 0;
+
x->props.header_len = sizeof(struct ip_esp_hdr) +
crypto_aead_ivsize(aead);
switch (x->props.mode) {