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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
parent6fbf2cb77461a0cd0675228d20dd0f70d7b2251f (diff)
[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')
-rw-r--r--net/ipv4/esp4.c71
-rw-r--r--net/ipv6/esp6.c77
-rw-r--r--net/xfrm/xfrm_algo.c138
-rw-r--r--net/xfrm/xfrm_user.c71
4 files changed, 325 insertions, 32 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index c4047223bfbe..fac4f102c9f9 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -439,32 +439,53 @@ static void esp_destroy(struct xfrm_state *x)
kfree(esp);
}
-static int esp_init_state(struct xfrm_state *x)
+static int esp_init_aead(struct xfrm_state *x)
{
- struct esp_data *esp = NULL;
+ 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 = 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;
+ 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);
@@ -512,8 +533,6 @@ static int esp_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);
@@ -522,9 +541,35 @@ static int esp_init_state(struct xfrm_state *x)
free_key:
kfree(key);
+error:
+ return err;
+}
+
+static int esp_init_state(struct xfrm_state *x)
+{
+ struct esp_data *esp;
+ struct crypto_aead *aead;
+ u32 align;
+ int err;
+
+ 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);
if (x->props.mode == XFRM_MODE_TUNNEL)
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index dc821acf3d33..ca48c56c4b17 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) {
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 02e3ecf9585d..6cc15250de69 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -28,6 +28,105 @@
* that instantiated crypto transforms have correct parameters for IPsec
* purposes.
*/
+static struct xfrm_algo_desc aead_list[] = {
+{
+ .name = "rfc4106(gcm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 64,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "rfc4106(gcm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 96,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "rfc4106(gcm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "rfc4309(ccm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 64,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "rfc4309(ccm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 96,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+{
+ .name = "rfc4309(ccm(aes))",
+
+ .uinfo = {
+ .aead = {
+ .icv_truncbits = 128,
+ }
+ },
+
+ .desc = {
+ .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16,
+ .sadb_alg_ivlen = 8,
+ .sadb_alg_minbits = 128,
+ .sadb_alg_maxbits = 256
+ }
+},
+};
+
static struct xfrm_algo_desc aalg_list[] = {
{
.name = "hmac(digest_null)",
@@ -332,6 +431,11 @@ static struct xfrm_algo_desc calg_list[] = {
},
};
+static inline int aead_entries(void)
+{
+ return ARRAY_SIZE(aead_list);
+}
+
static inline int aalg_entries(void)
{
return ARRAY_SIZE(aalg_list);
@@ -354,6 +458,13 @@ struct xfrm_algo_list {
u32 mask;
};
+static const struct xfrm_algo_list xfrm_aead_list = {
+ .algs = aead_list,
+ .entries = ARRAY_SIZE(aead_list),
+ .type = CRYPTO_ALG_TYPE_AEAD,
+ .mask = CRYPTO_ALG_TYPE_MASK,
+};
+
static const struct xfrm_algo_list xfrm_aalg_list = {
.algs = aalg_list,
.entries = ARRAY_SIZE(aalg_list),
@@ -461,6 +572,33 @@ struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe)
}
EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
+struct xfrm_aead_name {
+ const char *name;
+ int icvbits;
+};
+
+static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry,
+ const void *data)
+{
+ const struct xfrm_aead_name *aead = data;
+ const char *name = aead->name;
+
+ return aead->icvbits == entry->uinfo.aead.icv_truncbits && name &&
+ !strcmp(name, entry->name);
+}
+
+struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, int probe)
+{
+ struct xfrm_aead_name data = {
+ .name = name,
+ .icvbits = icv_len,
+ };
+
+ return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data,
+ probe);
+}
+EXPORT_SYMBOL_GPL(xfrm_aead_get_byname);
+
struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
{
if (idx >= aalg_entries())
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index e0ccdf267813..78338079b7f5 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -31,6 +31,11 @@
#include <linux/in6.h>
#endif
+static inline int aead_len(struct xfrm_algo_aead *alg)
+{
+ return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
+}
+
static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
{
struct nlattr *rt = attrs[type];
@@ -68,6 +73,22 @@ static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
return 0;
}
+static int verify_aead(struct nlattr **attrs)
+{
+ struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
+ struct xfrm_algo_aead *algp;
+
+ if (!rt)
+ return 0;
+
+ algp = nla_data(rt);
+ if (nla_len(rt) < aead_len(algp))
+ return -EINVAL;
+
+ algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
+ return 0;
+}
+
static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
xfrm_address_t **addrp)
{
@@ -119,20 +140,28 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
switch (p->id.proto) {
case IPPROTO_AH:
if (!attrs[XFRMA_ALG_AUTH] ||
+ attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ALG_COMP])
goto out;
break;
case IPPROTO_ESP:
- if ((!attrs[XFRMA_ALG_AUTH] &&
- !attrs[XFRMA_ALG_CRYPT]) ||
- attrs[XFRMA_ALG_COMP])
+ if (attrs[XFRMA_ALG_COMP])
+ goto out;
+ if (!attrs[XFRMA_ALG_AUTH] &&
+ !attrs[XFRMA_ALG_CRYPT] &&
+ !attrs[XFRMA_ALG_AEAD])
+ goto out;
+ if ((attrs[XFRMA_ALG_AUTH] ||
+ attrs[XFRMA_ALG_CRYPT]) &&
+ attrs[XFRMA_ALG_AEAD])
goto out;
break;
case IPPROTO_COMP:
if (!attrs[XFRMA_ALG_COMP] ||
+ attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_AUTH] ||
attrs[XFRMA_ALG_CRYPT])
goto out;
@@ -143,6 +172,7 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
case IPPROTO_ROUTING:
if (attrs[XFRMA_ALG_COMP] ||
attrs[XFRMA_ALG_AUTH] ||
+ attrs[XFRMA_ALG_AEAD] ||
attrs[XFRMA_ALG_CRYPT] ||
attrs[XFRMA_ENCAP] ||
attrs[XFRMA_SEC_CTX] ||
@@ -155,6 +185,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
}
+ if ((err = verify_aead(attrs)))
+ goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
goto out;
if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
@@ -208,6 +240,31 @@ static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
return 0;
}
+static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
+ struct nlattr *rta)
+{
+ struct xfrm_algo_aead *p, *ualg;
+ struct xfrm_algo_desc *algo;
+
+ if (!rta)
+ return 0;
+
+ ualg = nla_data(rta);
+
+ algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
+ if (!algo)
+ return -ENOSYS;
+ *props = algo->desc.sadb_alg_id;
+
+ p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ strcpy(p->alg_name, algo->name);
+ *algpp = p;
+ return 0;
+}
+
static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
{
int len = 0;
@@ -286,6 +343,9 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
copy_from_user_state(x, p);
+ if ((err = attach_aead(&x->aead, &x->props.ealgo,
+ attrs[XFRMA_ALG_AEAD])))
+ goto error;
if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
xfrm_aalg_get_byname,
attrs[XFRMA_ALG_AUTH])))
@@ -510,6 +570,8 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
if (x->lastused)
NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
+ if (x->aead)
+ NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
if (x->aalg)
NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
if (x->ealg)
@@ -1808,6 +1870,7 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
#undef XMSGSIZE
static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
+ [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
[XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
[XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
[XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
@@ -1972,6 +2035,8 @@ static int xfrm_notify_sa_flush(struct km_event *c)
static inline size_t xfrm_sa_len(struct xfrm_state *x)
{
size_t l = 0;
+ if (x->aead)
+ l += nla_total_size(aead_len(x->aead));
if (x->aalg)
l += nla_total_size(xfrm_alg_len(x->aalg));
if (x->ealg)