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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>
This commit is contained in:
Horia Geanta 2012-08-08 18:46:45 +03:00 committed by Herbert Xu
parent 79fd31d355
commit e763eb699b
1 changed files with 28 additions and 2 deletions
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30
drivers/crypto/talitos.c
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@ -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 @@ struct talitos_alg_template {
};
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 @@ static int talitos_probe(struct platform_device *ofdev)
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 @@ static int talitos_probe(struct platform_device *ofdev)
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 @@ static int talitos_probe(struct platform_device *ofdev)
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))