crypto: caam - add IPsec ESN support

Support for ESNs (extended sequence numbers).
Tested with strongswan by connecting back-to-back P1010RDB with P2020RDB.
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamalg.c

@@ -1650,7 +1650,11 @@ struct caam_alg_template {
 };
 
 static struct caam_alg_template driver_algs[] = {
-	/* single-pass ipsec_esp descriptor */
+	/*
+	 * single-pass ipsec_esp descriptor
+	 * authencesn(*,*) is also registered, although not present
+	 * explicitly here.
+	 */
 	{
 		.name = "authenc(hmac(md5),cbc(aes))",
 		.driver_name = "authenc-hmac-md5-cbc-aes-caam",
@@ -2213,7 +2217,9 @@ static int __init caam_algapi_init(void)
 	for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
 		/* TODO: check if h/w supports alg */
 		struct caam_crypto_alg *t_alg;
+		bool done = false;
 
+authencesn:
 		t_alg = caam_alg_alloc(ctrldev, &driver_algs[i]);
 		if (IS_ERR(t_alg)) {
 			err = PTR_ERR(t_alg);
@@ -2227,8 +2233,25 @@ static int __init caam_algapi_init(void)
 			dev_warn(ctrldev, "%s alg registration failed\n",
 				t_alg->crypto_alg.cra_driver_name);
 			kfree(t_alg);
-		} else
+		} else {
 			list_add_tail(&t_alg->entry, &priv->alg_list);
+			if (driver_algs[i].type == CRYPTO_ALG_TYPE_AEAD &&
+			    !memcmp(driver_algs[i].name, "authenc", 7) &&
+			    !done) {
+				char *name;
+
+				name = driver_algs[i].name;
+				memmove(name + 10, name + 7, strlen(name) - 7);
+				memcpy(name + 7, "esn", 3);
+
+				name = driver_algs[i].driver_name;
+				memmove(name + 10, name + 7, strlen(name) - 7);
+				memcpy(name + 7, "esn", 3);
+
+				done = true;
+				goto authencesn;
+			}
+		}
 	}
 	if (!list_empty(&priv->alg_list))
 		dev_info(ctrldev, "%s algorithms registered in /proc/crypto\n",

drivers/crypto/caam/compat.h

@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <linux/debugfs.h>
 #include <linux/circ_buf.h>
+#include <linux/string.h>
 #include <net/xfrm.h>
 
 #include <crypto/algapi.h>