ipsec: add support for RFC-4543 ENCR_NULL_AUTH_AES_GMAC

Type: improvement

Change-Id: I830f7a2ea3ac0aff5185698b9fa7a278c45116b0
Signed-off-by: Benoît Ganne <bganne@cisco.com>

6 files changed, 70 insertions, 3 deletions

diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 43d292d27e8..2c1efa2f4be 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -562,6 +562,12 @@ esp_decrypt_prepare_sync_op (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      op->aad_len = esp_aad_fill (op->aad, esp0, sa0, pd->seq_hi);
 	      op->tag = payload + len;
 	      op->tag_len = 16;
+	      if (PREDICT_FALSE (ipsec_sa_is_set_IS_NULL_GMAC (sa0)))
+		{
+		  /* RFC-4543 ENCR_NULL_AUTH_AES_GMAC: IV is part of AAD */
+		  payload -= iv_sz;
+		  len += iv_sz;
+		}
 	    }
 	  else
 	    {
@@ -682,6 +688,12 @@ out:
 	  aad = (u8 *) nonce - sizeof (esp_aead_t);
 	  esp_aad_fill (aad, esp0, sa0, pd->seq_hi);
 	  tag = payload + len;
+	  if (PREDICT_FALSE (ipsec_sa_is_set_IS_NULL_GMAC (sa0)))
+	    {
+	      /* RFC-4543 ENCR_NULL_AUTH_AES_GMAC: IV is part of AAD */
+	      payload -= iv_sz;
+	      len += iv_sz;
+	    }
 	}
       else
 	{
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index 86f9094cedc..a836453b58e 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -415,6 +415,12 @@ esp_prepare_sync_op (vlib_main_t *vm, ipsec_per_thread_data_t *ptd,
 	      op->aad_len = esp_aad_fill (op->aad, esp, sa0, seq_hi);
 	      op->tag = payload + crypto_len;
 	      op->tag_len = 16;
+	      if (PREDICT_FALSE (ipsec_sa_is_set_IS_NULL_GMAC (sa0)))
+		{
+		  /* RFC-4543 ENCR_NULL_AUTH_AES_GMAC: IV is part of AAD */
+		  crypto_start -= iv_sz;
+		  crypto_len += iv_sz;
+		}
 	    }
 	  else
 	    {
@@ -522,6 +528,12 @@ esp_prepare_async_frame (vlib_main_t *vm, ipsec_per_thread_data_t *ptd,
 	  /* constuct aad in a scratch space in front of the nonce */
 	  aad = (u8 *) nonce - sizeof (esp_aead_t);
 	  esp_aad_fill (aad, esp, sa, sa->seq_hi);
+	  if (PREDICT_FALSE (ipsec_sa_is_set_IS_NULL_GMAC (sa)))
+	    {
+	      /* RFC-4543 ENCR_NULL_AUTH_AES_GMAC: IV is part of AAD */
+	      crypto_start_offset -= iv_sz;
+	      crypto_total_len += iv_sz;
+	    }
 	}
       else
 	{
diff --git a/src/vnet/ipsec/ipsec.c b/src/vnet/ipsec/ipsec.c
index 14fc697e2eb..f8c39c327ed 100644
--- a/src/vnet/ipsec/ipsec.c
+++ b/src/vnet/ipsec/ipsec.c
@@ -562,6 +562,30 @@ ipsec_init (vlib_main_t * vm)
   a->iv_size = 8;
   a->icv_size = 16;
 
+  a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_NULL_GMAC_128;
+  a->enc_op_id = VNET_CRYPTO_OP_AES_128_NULL_GMAC_ENC;
+  a->dec_op_id = VNET_CRYPTO_OP_AES_128_NULL_GMAC_DEC;
+  a->alg = VNET_CRYPTO_ALG_AES_128_GCM;
+  a->iv_size = 8;
+  a->block_align = 1;
+  a->icv_size = 16;
+
+  a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_NULL_GMAC_192;
+  a->enc_op_id = VNET_CRYPTO_OP_AES_192_NULL_GMAC_ENC;
+  a->dec_op_id = VNET_CRYPTO_OP_AES_192_NULL_GMAC_DEC;
+  a->alg = VNET_CRYPTO_ALG_AES_192_GCM;
+  a->iv_size = 8;
+  a->block_align = 1;
+  a->icv_size = 16;
+
+  a = im->crypto_algs + IPSEC_CRYPTO_ALG_AES_NULL_GMAC_256;
+  a->enc_op_id = VNET_CRYPTO_OP_AES_256_NULL_GMAC_ENC;
+  a->dec_op_id = VNET_CRYPTO_OP_AES_256_NULL_GMAC_DEC;
+  a->alg = VNET_CRYPTO_ALG_AES_256_GCM;
+  a->iv_size = 8;
+  a->block_align = 1;
+  a->icv_size = 16;
+
   vec_validate (im->integ_algs, IPSEC_INTEG_N_ALG - 1);
   ipsec_main_integ_alg_t *i;
 
diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
index 80e61d09247..98160cde389 100644
--- a/src/vnet/ipsec/ipsec_sa.c
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -136,6 +136,13 @@ ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
     {
       ipsec_sa_set_IS_CTR (sa);
     }
+  else if (IPSEC_CRYPTO_ALG_IS_NULL_GMAC (crypto_alg))
+    {
+      sa->integ_icv_size = im->crypto_algs[crypto_alg].icv_size;
+      ipsec_sa_set_IS_CTR (sa);
+      ipsec_sa_set_IS_AEAD (sa);
+      ipsec_sa_set_IS_NULL_GMAC (sa);
+    }
 }
 
 void
@@ -416,7 +423,7 @@ ipsec_sa_add_and_lock (u32 id, u32 spi, ipsec_protocol_t proto,
   err = ipsec_check_support_cb (im, sa);
   if (err)
     {
-      clib_warning ("%s", err->what);
+      clib_warning ("%v", err->what);
       pool_put (ipsec_sa_pool, sa);
       return VNET_API_ERROR_UNIMPLEMENTED;
     }
diff --git a/src/vnet/ipsec/ipsec_sa.h b/src/vnet/ipsec/ipsec_sa.h
index a9abfdb05e2..cd90ef5c441 100644
--- a/src/vnet/ipsec/ipsec_sa.h
+++ b/src/vnet/ipsec/ipsec_sa.h
@@ -39,7 +39,10 @@
   _ (9, AES_GCM_256, "aes-gcm-256")                                           \
   _ (10, DES_CBC, "des-cbc")                                                  \
   _ (11, 3DES_CBC, "3des-cbc")                                                \
-  _ (12, CHACHA20_POLY1305, "chacha20-poly1305")
+  _ (12, CHACHA20_POLY1305, "chacha20-poly1305")                              \
+  _ (13, AES_NULL_GMAC_128, "aes-null-gmac-128")                              \
+  _ (14, AES_NULL_GMAC_192, "aes-null-gmac-192")                              \
+  _ (15, AES_NULL_GMAC_256, "aes-null-gmac-256")
 
 typedef enum
 {
@@ -49,6 +52,11 @@ typedef enum
     IPSEC_CRYPTO_N_ALG,
 } __clib_packed ipsec_crypto_alg_t;
 
+#define IPSEC_CRYPTO_ALG_IS_NULL_GMAC(_alg)                                   \
+  ((_alg == IPSEC_CRYPTO_ALG_AES_NULL_GMAC_128) ||                            \
+   (_alg == IPSEC_CRYPTO_ALG_AES_NULL_GMAC_192) ||                            \
+   (_alg == IPSEC_CRYPTO_ALG_AES_NULL_GMAC_256))
+
 #define IPSEC_CRYPTO_ALG_IS_GCM(_alg)                     \
   (((_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) ||             \
     (_alg == IPSEC_CRYPTO_ALG_AES_GCM_192) ||             \
@@ -112,7 +120,8 @@ typedef struct ipsec_key_t_
   _ (128, IS_AEAD, "aead")                                                    \
   _ (256, IS_CTR, "ctr")                                                      \
   _ (512, IS_ASYNC, "async")                                                  \
-  _ (1024, NO_ALGO_NO_DROP, "no-algo-no-drop")
+  _ (1024, NO_ALGO_NO_DROP, "no-algo-no-drop")                                \
+  _ (2048, IS_NULL_GMAC, "null-gmac")
 
 typedef enum ipsec_sad_flags_t_
 {
diff --git a/src/vnet/ipsec/ipsec_types.api b/src/vnet/ipsec/ipsec_types.api
index 3f894348bcb..9adcc6aa8eb 100644
--- a/src/vnet/ipsec/ipsec_types.api
+++ b/src/vnet/ipsec/ipsec_types.api
@@ -37,6 +37,9 @@ enum ipsec_crypto_alg
   IPSEC_API_CRYPTO_ALG_DES_CBC,
   IPSEC_API_CRYPTO_ALG_3DES_CBC,
   IPSEC_API_CRYPTO_ALG_CHACHA20_POLY1305 [backwards_compatible],
+  IPSEC_API_CRYPTO_ALG_AES_NULL_GMAC_128 [backwards_compatible],
+  IPSEC_API_CRYPTO_ALG_AES_NULL_GMAC_192 [backwards_compatible],
+  IPSEC_API_CRYPTO_ALG_AES_NULL_GMAC_256 [backwards_compatible],
 };
 
 /*