crypto: talitos - add IPsec ESN support
Support for ESNs (extended sequence numbers).
Tested with strongswan on a P2020RDB back-to-back setup.
Extracted from /etc/ipsec.conf:
esp=aes-sha1-esn-modp4096!
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index bea25e2..da11127 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -38,6 +38,7 @@
#include <linux/spinlock.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
@@ -1974,7 +1975,11 @@
};
static struct talitos_alg_template driver_algs[] = {
- /* AEAD algorithms. These use a single-pass ipsec_esp descriptor */
+ /*
+ * AEAD algorithms. These use a single-pass ipsec_esp descriptor.
+ * authencesn(*,*) is also registered, although not present
+ * explicitly here.
+ */
{ .type = CRYPTO_ALG_TYPE_AEAD,
.alg.crypto = {
.cra_name = "authenc(hmac(sha1),cbc(aes))",
@@ -2816,7 +2821,9 @@
if (hw_supports(dev, driver_algs[i].desc_hdr_template)) {
struct talitos_crypto_alg *t_alg;
char *name = NULL;
+ bool authenc = false;
+authencesn:
t_alg = talitos_alg_alloc(dev, &driver_algs[i]);
if (IS_ERR(t_alg)) {
err = PTR_ERR(t_alg);
@@ -2831,6 +2838,8 @@
err = crypto_register_alg(
&t_alg->algt.alg.crypto);
name = t_alg->algt.alg.crypto.cra_driver_name;
+ authenc = authenc ? !authenc :
+ !(bool)memcmp(name, "authenc", 7);
break;
case CRYPTO_ALG_TYPE_AHASH:
err = crypto_register_ahash(
@@ -2843,8 +2852,25 @@
dev_err(dev, "%s alg registration failed\n",
name);
kfree(t_alg);
- } else
+ } else {
list_add_tail(&t_alg->entry, &priv->alg_list);
+ if (authenc) {
+ struct crypto_alg *alg =
+ &driver_algs[i].alg.crypto;
+
+ name = alg->cra_name;
+ memmove(name + 10, name + 7,
+ strlen(name) - 7);
+ memcpy(name + 7, "esn", 3);
+
+ name = alg->cra_driver_name;
+ memmove(name + 10, name + 7,
+ strlen(name) - 7);
+ memcpy(name + 7, "esn", 3);
+
+ goto authencesn;
+ }
+ }
}
}
if (!list_empty(&priv->alg_list))