dpdk/ipsec: rework plus improved cli commands

This patch reworks the DPDK ipsec implementation including the cryptodev
management as well as replacing new cli commands for better usability.

For the data path:
 - The dpdk-esp-encrypt-post node is not necessary anymore.
 - IPv4 packets in the decrypt path are sent to ip4-input-no-checksum instead
 of ip4-input.

The DPDK cryptodev cli commands are replaced by the following new commands:
 - show dpdk crypto devices
 - show dpdk crypto placement [verbose]
 - set dpdk crypto placement (<device> <thread> | auto)
 - clear dpdk crypto placement <device> [<thread>]
 - show dpdk crypto pools

Change-Id: I47324517ede82d3e6e0e9f9c71c1a3433714b27b
Signed-off-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>

1 files changed, 232 insertions, 179 deletions

diff --git a/src/plugins/dpdk/ipsec/esp_decrypt.c b/src/plugins/dpdk/ipsec/esp_decrypt.c
index c4f295d393c..90be466efd7 100644
--- a/src/plugins/dpdk/ipsec/esp_decrypt.c
+++ b/src/plugins/dpdk/ipsec/esp_decrypt.c
@@ -1,10 +1,10 @@
 /*
  * esp_decrypt.c : IPSec ESP Decrypt node using DPDK Cryptodev
  *
- * Copyright (c) 2016 Intel and/or its affiliates.
+ * Copyright (c) 2017 Intel and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
+ * You may obtain a opy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
@@ -20,14 +20,14 @@
 #include <vnet/ip/ip.h>
 
 #include <vnet/ipsec/ipsec.h>
+#include <vnet/ipsec/esp.h>
 #include <dpdk/ipsec/ipsec.h>
-#include <dpdk/ipsec/esp.h>
 #include <dpdk/device/dpdk.h>
 #include <dpdk/device/dpdk_priv.h>
 
 #define foreach_esp_decrypt_next	       \
 _(DROP, "error-drop")			       \
-_(IP4_INPUT, "ip4-input")		       \
+_(IP4_INPUT, "ip4-input-no-checksum")	       \
 _(IP6_INPUT, "ip6-input")
 
 #define _(v, s) ESP_DECRYPT_NEXT_##v,
@@ -43,8 +43,10 @@ typedef enum {
  _(REPLAY, "SA replayed packet")	         \
  _(NOT_IP, "Not IP packet (dropped)")	         \
  _(ENQ_FAIL, "Enqueue failed (buffer full)")     \
- _(NO_CRYPTODEV, "Cryptodev not configured")     \
- _(BAD_LEN, "Invalid ciphertext length")
+ _(DISCARD, "Not enough crypto operations, discarding frame")  \
+ _(BAD_LEN, "Invalid ciphertext length")         \
+ _(SESSION, "Failed to get crypto session")      \
+ _(NOSUP, "Cipher/Auth not supported")
 
 
 typedef enum {
@@ -65,6 +67,7 @@ vlib_node_registration_t dpdk_esp_decrypt_node;
 typedef struct {
   ipsec_crypto_alg_t crypto_alg;
   ipsec_integ_alg_t integ_alg;
+  u8 packet_data[64];
 } esp_decrypt_trace_t;
 
 /* packet trace format function */
@@ -73,10 +76,14 @@ static u8 * format_esp_decrypt_trace (u8 * s, va_list * args)
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
   esp_decrypt_trace_t * t = va_arg (*args, esp_decrypt_trace_t *);
+  uword indent = format_get_indent (s);
 
-  s = format (s, "esp: crypto %U integrity %U",
+  s = format (s, "cipher %U auth %U\n",
 	      format_ipsec_crypto_alg, t->crypto_alg,
 	      format_ipsec_integ_alg, t->integ_alg);
+  s = format (s, "%U%U",
+	      format_white_space, indent,
+	      format_esp_header, t->packet_data);
   return s;
 }
 
@@ -87,30 +94,31 @@ dpdk_esp_decrypt_node_fn (vlib_main_t * vm,
 {
   u32 n_left_from, *from, *to_next, next_index;
   ipsec_main_t *im = &ipsec_main;
-  u32 thread_index = vlib_get_thread_index();
-  dpdk_crypto_main_t * dcm = &dpdk_crypto_main;
-  dpdk_esp_main_t * em = &dpdk_esp_main;
-  u32 i;
+  u32 thread_idx = vlib_get_thread_index();
+  dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
+  crypto_resource_t *res = 0;
+  ipsec_sa_t *sa0 = 0;
+  crypto_alg_t *cipher_alg = 0, *auth_alg = 0;
+  struct rte_cryptodev_sym_session *session = 0;
+  u32 ret, last_sa_index = ~0;
+  u8 numa = rte_socket_id ();
+  u8 is_aead = 0;
+  crypto_worker_main_t *cwm =
+    vec_elt_at_index (dcm->workers_main, thread_idx);
+  struct rte_crypto_op **ops = cwm->ops;
 
   from = vlib_frame_vector_args (from_frame);
   n_left_from = from_frame->n_vectors;
 
-  crypto_worker_main_t *cwm =
-    vec_elt_at_index(dcm->workers_main, thread_index);
-  u32 n_qps = vec_len(cwm->qp_data);
-  struct rte_crypto_op ** cops_to_enq[n_qps];
-  u32 n_cop_qp[n_qps], * bi_to_enq[n_qps];
-
-  for (i = 0; i < n_qps; i++)
+  ret = crypto_alloc_ops (numa, ops, n_left_from);
+  if (ret)
     {
-      bi_to_enq[i] = cwm->qp_data[i].bi;
-      cops_to_enq[i] = cwm->qp_data[i].cops;
+      vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
+				   ESP_DECRYPT_ERROR_DISCARD, 1);
+      /* Discard whole frame */
+      return n_left_from;
     }
 
-  memset(n_cop_qp, 0, n_qps * sizeof(u32));
-
-  crypto_alloc_cops();
-
   next_index = ESP_DECRYPT_NEXT_DROP;
 
   while (n_left_from > 0)
@@ -121,44 +129,79 @@ dpdk_esp_decrypt_node_fn (vlib_main_t * vm,
 
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
-	  u32 bi0, sa_index0 = ~0, seq, trunc_size, iv_size;
-	  vlib_buffer_t * b0;
-	  esp_header_t * esp0;
-	  ipsec_sa_t * sa0;
-	  struct rte_mbuf * mb0 = 0;
-	  const int BLOCK_SIZE = 16;
-	  crypto_sa_session_t * sa_sess;
-	  void * sess;
-	  u16 qp_index;
-	  struct rte_crypto_op * cop = 0;
+	  clib_error_t *error;
+	  u32 bi0, sa_index0, seq, iv_size;
+	  u8 trunc_size;
+	  vlib_buffer_t *b0;
+	  esp_header_t *esp0;
+	  struct rte_mbuf *mb0;
+	  struct rte_crypto_op *op;
+	  u16 res_idx;
 
 	  bi0 = from[0];
 	  from += 1;
 	  n_left_from -= 1;
 
 	  b0 = vlib_get_buffer (vm, bi0);
+	  mb0 = rte_mbuf_from_vlib_buffer(b0);
 	  esp0 = vlib_buffer_get_current (b0);
 
-	  sa_index0 = vnet_buffer(b0)->ipsec.sad_index;
-	  sa0 = pool_elt_at_index (im->sad, sa_index0);
+	  /* ih0/ih6_0 */
+	  CLIB_PREFETCH (esp0, sizeof (esp0[0]) + 16, LOAD);
+	  /* mb0 */
+	  CLIB_PREFETCH (mb0, CLIB_CACHE_LINE_BYTES, STORE);
 
-	  seq = clib_host_to_net_u32(esp0->seq);
+	  op = ops[0];
+	  ops += 1;
+	  ASSERT (op->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
 
-	  /* anti-replay check */
-	  if (sa0->use_anti_replay)
+	  dpdk_op_priv_t *priv = crypto_op_get_priv (op);
+
+	  u16 op_len =
+	    sizeof (op[0]) + sizeof (op[0].sym[0]) + sizeof (priv[0]);
+	  CLIB_PREFETCH (op, op_len, STORE);
+
+	  sa_index0 = vnet_buffer(b0)->ipsec.sad_index;
+
+	  if (sa_index0 != last_sa_index)
 	    {
-	      int rv = 0;
+	      last_sa_index = sa_index0;
 
-	      if (PREDICT_TRUE(sa0->use_esn))
-		rv = esp_replay_check_esn(sa0, seq);
-	      else
-		rv = esp_replay_check(sa0, seq);
+	      sa0 = pool_elt_at_index (im->sad, sa_index0);
+
+	      cipher_alg = vec_elt_at_index (dcm->cipher_algs, sa0->crypto_alg);
+	      auth_alg = vec_elt_at_index (dcm->auth_algs, sa0->integ_alg);
+
+#if DPDK_NO_AEAD
+	      is_aead = (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128 |
+			    sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_192 |
+			    sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_256);
+#else
+	      is_aead = (cipher_alg->type == RTE_CRYPTO_SYM_XFORM_AEAD);
+#endif
+	      if (is_aead)
+		auth_alg = cipher_alg;
 
-	      if (PREDICT_FALSE(rv))
+	      res_idx = get_resource (cwm, sa0);
+
+	      if (PREDICT_FALSE (res_idx == (u16) ~0))
 		{
-		  clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq);
+		  clib_warning ("unsupported SA by thread index %u", thread_idx);
 		  vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
-					       ESP_DECRYPT_ERROR_REPLAY, 1);
+					       ESP_DECRYPT_ERROR_NOSUP, 1);
+		  to_next[0] = bi0;
+		  to_next += 1;
+		  n_left_to_next -= 1;
+		  goto trace;
+		}
+	      res = vec_elt_at_index (dcm->resource, res_idx);
+
+	      error = crypto_get_session (&session, sa_index0, res, cwm, 0);
+	      if (PREDICT_FALSE (error || !session))
+		{
+		  clib_warning ("failed to get crypto session");
+		  vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
+					       ESP_DECRYPT_ERROR_SESSION, 1);
 		  to_next[0] = bi0;
 		  to_next += 1;
 		  n_left_to_next -= 1;
@@ -166,16 +209,23 @@ dpdk_esp_decrypt_node_fn (vlib_main_t * vm,
 		}
 	    }
 
-	  sa0->total_data_size += b0->current_length;
+	  /* anti-replay check */
+	  if (sa0->use_anti_replay)
+	    {
+	      int rv = 0;
 
-	  sa_sess = pool_elt_at_index(cwm->sa_sess_d[0], sa_index0);
+	      seq = clib_net_to_host_u32 (esp0->seq);
 
-	  if (PREDICT_FALSE(!sa_sess->sess))
-	    {
-	      int ret = create_sym_sess(sa0, sa_sess, 0);
+	      if (PREDICT_TRUE(sa0->use_esn))
+		rv = esp_replay_check_esn (sa0, seq);
+	      else
+		rv = esp_replay_check (sa0, seq);
 
-	      if (PREDICT_FALSE (ret))
+	      if (PREDICT_FALSE (rv))
 		{
+		  clib_warning ("failed anti-replay check");
+		  vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
+					       ESP_DECRYPT_ERROR_REPLAY, 1);
 		  to_next[0] = bi0;
 		  to_next += 1;
 		  n_left_to_next -= 1;
@@ -183,112 +233,101 @@ dpdk_esp_decrypt_node_fn (vlib_main_t * vm,
 		}
 	    }
 
-	  sess = sa_sess->sess;
-	  qp_index = sa_sess->qp_index;
-
-	  ASSERT (vec_len (vec_elt (cwm->qp_data, qp_index).free_cops) > 0);
-	  cop = vec_pop (vec_elt (cwm->qp_data, qp_index).free_cops);
-	  ASSERT (cop->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
-
-	  cops_to_enq[qp_index][0] = cop;
-	  cops_to_enq[qp_index] += 1;
-	  n_cop_qp[qp_index] += 1;
-	  bi_to_enq[qp_index][0] = bi0;
-	  bi_to_enq[qp_index] += 1;
+	  priv->next = DPDK_CRYPTO_INPUT_NEXT_DECRYPT_POST;
 
-	  rte_crypto_op_attach_sym_session(cop, sess);
+	  /* FIXME multi-seg */
+	  sa0->total_data_size += b0->current_length;
 
-	  if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
-	    trunc_size = 16;
-	  else
-	    trunc_size = em->esp_integ_algs[sa0->integ_alg].trunc_size;
-	  iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len;
+	  res->ops[res->n_ops] = op;
+	  res->bi[res->n_ops] = bi0;
+	  res->n_ops += 1;
 
 	  /* Convert vlib buffer to mbuf */
-	  mb0 = rte_mbuf_from_vlib_buffer(b0);
 	  mb0->data_len = b0->current_length;
 	  mb0->pkt_len = b0->current_length;
 	  mb0->data_off = RTE_PKTMBUF_HEADROOM + b0->current_data;
 
+	  trunc_size = auth_alg->trunc_size;
+	  iv_size = cipher_alg->iv_len;
+
 	  /* Outer IP header has already been stripped */
-	  u16 payload_len = rte_pktmbuf_pkt_len(mb0) - sizeof (esp_header_t) -
-	      iv_size - trunc_size;
+	  u16 payload_len =
+	    b0->current_length - sizeof (esp_header_t) - iv_size - trunc_size;
 
-	  if ((payload_len & (BLOCK_SIZE - 1)) || (payload_len <= 0))
+	  ASSERT (payload_len >= 4);
+
+	  if (payload_len & (cipher_alg->boundary - 1))
 	    {
 	      clib_warning ("payload %u not multiple of %d\n",
-			    payload_len, BLOCK_SIZE);
+			    payload_len, cipher_alg->boundary);
 	      vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
 					   ESP_DECRYPT_ERROR_BAD_LEN, 1);
-	      vec_add (vec_elt (cwm->qp_data, qp_index).free_cops, &cop, 1);
-	      bi_to_enq[qp_index] -= 1;
-	      cops_to_enq[qp_index] -= 1;
-	      n_cop_qp[qp_index] -= 1;
+	      res->n_ops -= 1;
 	      to_next[0] = bi0;
 	      to_next += 1;
 	      n_left_to_next -= 1;
 	      goto trace;
 	    }
 
-	  struct rte_crypto_sym_op *sym_cop = (struct rte_crypto_sym_op *)(cop + 1);
-
-	  u8 is_aead = sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128;
 	  u32 cipher_off, cipher_len;
-	  u32 auth_off = 0, auth_len = 0, aad_size = 0;
+	  u32 auth_len = 0, aad_size = 0;
 	  u8 *aad = NULL, *digest = NULL;
 	  u64 digest_paddr = 0;
 
-          u8 *iv = rte_pktmbuf_mtod_offset(mb0, void*, sizeof (esp_header_t));
-          dpdk_cop_priv_t *priv = (dpdk_cop_priv_t *)(sym_cop + 1);
+          u8 *iv = (u8 *) (esp0 + 1);
+
           dpdk_gcm_cnt_blk *icb = &priv->cb;
 
 	  cipher_off = sizeof (esp_header_t) + iv_size;
 	  cipher_len = payload_len;
 
-          digest =
-	    vlib_buffer_get_current (b0) + sizeof(esp_header_t) +
-	    iv_size + payload_len;
+          digest = vlib_buffer_get_tail (b0) - trunc_size;
 
-          if (is_aead)
-            {
+	  if (cipher_alg->alg == RTE_CRYPTO_CIPHER_AES_CBC)
+	    clib_memcpy(icb, iv, 16);
+	  else /* CTR/GCM */
+	    {
 	      u32 *_iv = (u32 *) iv;
 
 	      crypto_set_icb (icb, sa0->salt, _iv[0], _iv[1]);
+#if DPDK_NO_AEAD
 	      iv_size = 16;
+#else
+	      iv_size = 12;
+#endif
+	    }
 
+          if (is_aead)
+            {
               aad = priv->aad;
               clib_memcpy(aad, esp0, 8);
-	      aad_size = 8;
-              if (sa0->use_esn)
+              if (PREDICT_FALSE (sa0->use_esn))
 		{
 		  *((u32*)&aad[8]) = sa0->seq_hi;
 		  aad_size = 12;
 		}
+	      else
+		aad_size = 8;
             }
           else
             {
-	      clib_memcpy(icb, iv, 16);
-
-	      auth_off = 0;
 	      auth_len = sizeof(esp_header_t) + iv_size + payload_len;
 
               if (sa0->use_esn)
                 {
-                  dpdk_cop_priv_t* priv = (dpdk_cop_priv_t*) (sym_cop + 1);
-
                   clib_memcpy (priv->icv, digest, trunc_size);
                   *((u32*) digest) = sa0->seq_hi;
 		  auth_len += sizeof(sa0->seq_hi);
 
                   digest = priv->icv;
 		  digest_paddr =
-		    cop->phys_addr + (uintptr_t) priv->icv - (uintptr_t) cop;
+		    op->phys_addr + (uintptr_t) priv->icv - (uintptr_t) op;
                 }
             }
 
-	  crypto_op_setup (is_aead, mb0, cop, sess,
+	  crypto_op_setup (is_aead, mb0, op, session,
 			   cipher_off, cipher_len, (u8 *) icb, iv_size,
-			   auth_off, auth_len, aad, aad_size,
+			   0, auth_len, aad, aad_size,
 			   digest, digest_paddr, trunc_size);
 trace:
 	  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
@@ -296,38 +335,21 @@ trace:
 	      esp_decrypt_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->crypto_alg = sa0->crypto_alg;
 	      tr->integ_alg = sa0->integ_alg;
+	      clib_memcpy (tr->packet_data, vlib_buffer_get_current (b0),
+			   sizeof (esp_header_t));
 	    }
 	}
       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }
+
   vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
 			       ESP_DECRYPT_ERROR_RX_PKTS,
 			       from_frame->n_vectors);
-  crypto_qp_data_t *qpd;
-  /* *INDENT-OFF* */
-  vec_foreach_index (i, cwm->qp_data)
-    {
-      u32 enq;
-
-      if (!n_cop_qp[i])
-	continue;
 
-      qpd = vec_elt_at_index(cwm->qp_data, i);
-      enq = rte_cryptodev_enqueue_burst(qpd->dev_id, qpd->qp_id,
-					qpd->cops, n_cop_qp[i]);
-      qpd->inflights += enq;
+  crypto_enqueue_ops (vm, cwm, 0, dpdk_esp_decrypt_node.index,
+		      ESP_DECRYPT_ERROR_ENQ_FAIL, numa);
 
-      if (PREDICT_FALSE(enq < n_cop_qp[i]))
-	{
-	  crypto_free_cop (qpd, &qpd->cops[enq], n_cop_qp[i] - enq);
-	  vlib_buffer_free (vm, &qpd->bi[enq], n_cop_qp[i] - enq);
-
-	  vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
-				       ESP_DECRYPT_ERROR_ENQ_FAIL,
-				       n_cop_qp[i] - enq);
-	}
-    }
-  /* *INDENT-ON* */
+  crypto_free_ops (numa, ops, cwm->ops + from_frame->n_vectors - ops);
 
   return from_frame->n_vectors;
 }
@@ -378,6 +400,21 @@ vlib_node_registration_t dpdk_esp_decrypt_post_node;
 
 static u8 * format_esp_decrypt_post_trace (u8 * s, va_list * args)
 {
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  esp_decrypt_trace_t * t = va_arg (*args, esp_decrypt_trace_t *);
+  uword indent = format_get_indent (s);
+
+  s = format (s, "cipher %U auth %U\n",
+	      format_ipsec_crypto_alg, t->crypto_alg,
+	      format_ipsec_integ_alg, t->integ_alg);
+
+  ip4_header_t *ih4 = (ip4_header_t *) t->packet_data;
+  if ((ih4->ip_version_and_header_length & 0xF0) == 0x60)
+    s = format (s, "%U%U", format_white_space, indent, format_ip6_header, ih4);
+  else
+    s = format (s, "%U%U", format_white_space, indent, format_ip4_header, ih4);
+
   return s;
 }
 
@@ -390,7 +427,7 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
   ipsec_sa_t * sa0;
   u32 sa_index0 = ~0;
   ipsec_main_t *im = &ipsec_main;
-  dpdk_esp_main_t *em = &dpdk_esp_main;
+  dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
 
   from = vlib_frame_vector_args (from_frame);
   n_left_from = from_frame->n_vectors;
@@ -406,12 +443,13 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
       while (n_left_from > 0 && n_left_to_next > 0)
 	{
 	  esp_footer_t * f0;
-	  u32 bi0, next0, trunc_size, iv_size;
+	  u32 bi0, iv_size, next0;
 	  vlib_buffer_t * b0 = 0;
 	  ip4_header_t *ih4 = 0, *oh4 = 0;
 	  ip6_header_t *ih6 = 0, *oh6 = 0;
-	  u8 tunnel_mode = 1;
-	  u8 transport_ip6 = 0;
+	  crypto_alg_t *cipher_alg, *auth_alg;
+	  esp_header_t *esp0;
+	  u8 trunc_size, is_aead;
 
 	  next0 = ESP_DECRYPT_NEXT_DROP;
 
@@ -421,6 +459,7 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
 	  n_left_to_next -= 1;
 
 	  b0 = vlib_get_buffer (vm, bi0);
+	  esp0 = vlib_buffer_get_current (b0);
 
 	  sa_index0 = vnet_buffer(b0)->ipsec.sad_index;
 	  sa0 = pool_elt_at_index (im->sad, sa_index0);
@@ -428,15 +467,24 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
 	  to_next[0] = bi0;
 	  to_next += 1;
 
-	  if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
-	    trunc_size = 16;
-	  else
-	    trunc_size = em->esp_integ_algs[sa0->integ_alg].trunc_size;
-	  iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len;
+	  cipher_alg = vec_elt_at_index (dcm->cipher_algs, sa0->crypto_alg);
+	  auth_alg = vec_elt_at_index (dcm->auth_algs, sa0->integ_alg);
+#if DPDK_NO_AEAD
+	  is_aead = (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128 |
+			sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_192 |
+			sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_256);
+#else
+	  is_aead = cipher_alg->type == RTE_CRYPTO_SYM_XFORM_AEAD;
+#endif
+	  if (is_aead)
+	    auth_alg = cipher_alg;
+
+	  trunc_size = auth_alg->trunc_size;
+
+	  iv_size = cipher_alg->iv_len;
 
 	  if (sa0->use_anti_replay)
 	    {
-	      esp_header_t * esp0 = vlib_buffer_get_current (b0);
 	      u32 seq;
 	      seq = clib_host_to_net_u32(esp0->seq);
 	      if (PREDICT_TRUE(sa0->use_esn))
@@ -445,39 +493,30 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
 		esp_replay_advance(sa0, seq);
 	    }
 
+	  /* FIXME ip header */
 	  ih4 = (ip4_header_t *) (b0->data + sizeof(ethernet_header_t));
 	  vlib_buffer_advance (b0, sizeof (esp_header_t) + iv_size);
 
-	  b0->current_length -= (trunc_size + 2);
 	  b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
-	  f0 = (esp_footer_t *) ((u8 *) vlib_buffer_get_current (b0) +
-				 b0->current_length);
-	  b0->current_length -= f0->pad_length;
-
-	  /* transport mode */
-	  if (PREDICT_FALSE(!sa0->is_tunnel && !sa0->is_tunnel_ip6))
+	  f0 = (esp_footer_t *) (vlib_buffer_get_tail (b0) - trunc_size - 2);
+	  b0->current_length -= (f0->pad_length + trunc_size + 2);
+#if 0
+	  /* check padding */
+	  const u8 *padding = vlib_buffer_get_tail (b0);
+	  if (PREDICT_FALSE (memcmp (padding, pad_data, f0->pad_length)))
 	    {
-	      tunnel_mode = 0;
-
-	      if (PREDICT_TRUE((ih4->ip_version_and_header_length & 0xF0) != 0x40))
-		{
-		  if (PREDICT_TRUE((ih4->ip_version_and_header_length & 0xF0) == 0x60))
-		    transport_ip6 = 1;
-		  else
-		    {
-		      clib_warning("next header: 0x%x", f0->next_header);
-		      vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
-						   ESP_DECRYPT_ERROR_NOT_IP, 1);
-		      goto trace;
-		    }
-		}
+	      clib_warning("bad padding");
+	      vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
+					   ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
+					   1);
+	      goto trace;
 	    }
-
-	  if (PREDICT_TRUE (tunnel_mode))
+#endif
+	  if (sa0->is_tunnel)
 	    {
-	      if (PREDICT_TRUE(f0->next_header == IP_PROTOCOL_IP_IN_IP))
+	      if (f0->next_header == IP_PROTOCOL_IP_IN_IP)
 		next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
-	      else if (f0->next_header == IP_PROTOCOL_IPV6)
+	      else if (sa0->is_tunnel_ip6 && f0->next_header == IP_PROTOCOL_IPV6)
 		next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
 	      else
 		{
@@ -488,11 +527,31 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
 		  goto trace;
 		}
 	    }
-	  /* transport mode */
-	  else
+	  else /* transport mode */
 	    {
-	      if (PREDICT_FALSE(transport_ip6))
+	      if ((ih4->ip_version_and_header_length & 0xF0) == 0x40)
 		{
+		  u16 ih4_len = ip4_header_bytes (ih4);
+		  vlib_buffer_advance (b0, - ih4_len);
+		  oh4 = vlib_buffer_get_current (b0);
+		  memmove(oh4, ih4, ih4_len);
+
+		  next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
+		  u16 old_ttl_prot =
+		    ((u16) oh4->ttl) << 8 | (u16) oh4->protocol;
+		  u16 new_ttl_prot =
+		    ((u16) oh4->ttl) << 8 | (u16) f0->next_header;
+		  oh4->protocol = f0->next_header;
+		  u16 new_len = clib_host_to_net_u16 (b0->current_length);
+		  oh4->length = new_len;
+		  /* rfc1264 incremental checksum update */
+		  oh4->checksum = ~(~oh4->checksum + ~oh4->length + new_len +
+				    ~old_ttl_prot + new_ttl_prot);
+
+		}
+	      else if ((ih4->ip_version_and_header_length & 0xF0) == 0x60)
+		{
+		  /* FIXME find ip header */
 		  ih6 = (ip6_header_t *) (b0->data + sizeof(ethernet_header_t));
 		  vlib_buffer_advance (b0, -sizeof(ip6_header_t));
 		  oh6 = vlib_buffer_get_current (b0);
@@ -500,36 +559,29 @@ dpdk_esp_decrypt_post_node_fn (vlib_main_t * vm,
 
 		  next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
 		  oh6->protocol = f0->next_header;
-		  oh6->payload_length =
-		      clib_host_to_net_u16 (
-			  vlib_buffer_length_in_chain(vm, b0) -
-			  sizeof (ip6_header_t));
+		  u16 len = b0->current_length - sizeof (ip6_header_t);
+		  oh6->payload_length = clib_host_to_net_u16 (len);
 		}
 	      else
 		{
-		  vlib_buffer_advance (b0, -sizeof(ip4_header_t));
-		  oh4 = vlib_buffer_get_current (b0);
-		  memmove(oh4, ih4, sizeof(ip4_header_t));
-
-		  next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
-		  oh4->ip_version_and_header_length = 0x45;
-		  oh4->fragment_id = 0;
-		  oh4->flags_and_fragment_offset = 0;
-		  oh4->protocol = f0->next_header;
-		  oh4->length = clib_host_to_net_u16 (
-		      vlib_buffer_length_in_chain (vm, b0));
-		  oh4->checksum = ip4_header_checksum (oh4);
+		  clib_warning("next header: 0x%x", f0->next_header);
+		  vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
+					       ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
+					       1);
+		  goto trace;
 		}
 	    }
 
 	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32)~0;
 
-trace:
+	trace:
 	  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      esp_decrypt_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
 	      tr->crypto_alg = sa0->crypto_alg;
 	      tr->integ_alg = sa0->integ_alg;
+	      ih4 = vlib_buffer_get_current (b0);
+	      clib_memcpy (tr->packet_data, ih4, sizeof (ip6_header_t));
 	    }
 
 	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
@@ -537,6 +589,7 @@ trace:
 	}
       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     }
+
   vlib_node_increment_counter (vm, dpdk_esp_decrypt_post_node.index,
 			       ESP_DECRYPT_POST_ERROR_PKTS,
 			       from_frame->n_vectors);