1 files changed, 472 insertions, 0 deletions

diff --git a/src/plugins/odp/ipsec/esp_decrypt.c b/src/plugins/odp/ipsec/esp_decrypt.c
new file mode 100644
index 00000000..728d1c5e
--- /dev/null
+++ b/src/plugins/odp/ipsec/esp_decrypt.c
@@ -0,0 +1,472 @@
+/*
+ * esp_decrypt.c : IPSec ESP decrypt node
+ *
+ * Copyright (c) 2015 Cisco 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:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/api_errno.h>
+#include <vnet/ip/ip.h>
+
+#include <odp/ipsec/ipsec.h>
+#include <odp/ipsec/esp.h>
+
+#define foreach_esp_decrypt_next                \
+_(DROP, "error-drop")                           \
+_(IP4_INPUT, "ip4-input")                       \
+_(IP6_INPUT, "ip6-input")                       \
+_(IPSEC_GRE_INPUT, "ipsec-gre-input")
+
+#define _(v, s) ESP_DECRYPT_NEXT_##v,
+typedef enum
+{
+  foreach_esp_decrypt_next
+#undef _
+    ESP_DECRYPT_N_NEXT,
+} esp_decrypt_next_t;
+
+
+#define foreach_esp_decrypt_error                   \
+ _(RX_PKTS, "ESP pkts received")                    \
+ _(NO_BUFFER, "No buffer (packed dropped)")         \
+ _(DECRYPTION_FAILED, "ESP decryption failed")      \
+ _(INTEG_ERROR, "Integrity check failed")           \
+ _(REPLAY, "SA replayed packet")                    \
+ _(NOT_IP, "Not IP packet (dropped)")
+
+
+typedef enum
+{
+#define _(sym,str) ESP_DECRYPT_ERROR_##sym,
+  foreach_esp_decrypt_error
+#undef _
+    ESP_DECRYPT_N_ERROR,
+} esp_decrypt_error_t;
+
+static char *esp_decrypt_error_strings[] = {
+#define _(sym,string) string,
+  foreach_esp_decrypt_error
+#undef _
+};
+
+typedef struct
+{
+  ipsec_crypto_alg_t crypto_alg;
+  ipsec_integ_alg_t integ_alg;
+} esp_decrypt_trace_t;
+
+vlib_node_registration_t odp_crypto_esp_decrypt_node;
+
+/* packet trace format function */
+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 *);
+
+  s = format (s, "(ODP) esp: crypto %U integrity %U",
+	      format_ipsec_crypto_alg, t->crypto_alg,
+	      format_ipsec_integ_alg, t->integ_alg);
+  return s;
+}
+
+always_inline void
+esp_decrypt_aes_cbc (ipsec_crypto_alg_t alg,
+		     u8 * in, u8 * out, size_t in_len, u8 * key, u8 * iv)
+{
+  esp_main_t *em = &odp_esp_main;
+  u32 thread_index = vlib_get_thread_index ();
+  EVP_CIPHER_CTX *ctx = &(em->per_thread_data[thread_index].decrypt_ctx);
+  const EVP_CIPHER *cipher = NULL;
+  int out_len;
+
+  ASSERT (alg < IPSEC_CRYPTO_N_ALG);
+
+  if (PREDICT_FALSE (em->esp_crypto_algs[alg].type == 0))
+    return;
+
+  if (PREDICT_FALSE
+      (alg != em->per_thread_data[thread_index].last_decrypt_alg))
+    {
+      cipher = em->esp_crypto_algs[alg].type;
+      em->per_thread_data[thread_index].last_decrypt_alg = alg;
+    }
+
+  EVP_DecryptInit_ex (ctx, cipher, NULL, key, iv);
+
+  EVP_DecryptUpdate (ctx, out, &out_len, in, in_len);
+  EVP_DecryptFinal_ex (ctx, out + out_len, &out_len);
+}
+
+static uword
+esp_decrypt_node_fn (vlib_main_t * vm,
+		     vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+  u32 n_left_from, *from, next_index, *to_next;
+  ipsec_main_t *im = &ipsec_main;
+  esp_main_t *em = &odp_esp_main;
+  u32 *recycle = 0;
+  from = vlib_frame_vector_args (from_frame);
+  n_left_from = from_frame->n_vectors;
+  odp_crypto_main_t *ocm = &odp_crypto_main;
+  u32 thread_index = vlib_get_thread_index ();
+
+  ipsec_alloc_empty_buffers (vm, im);
+
+  u32 *empty_buffers = im->empty_buffers[thread_index];
+
+  odp_crypto_worker_main_t *cwm =
+    vec_elt_at_index (ocm->workers, thread_index);
+
+  if (PREDICT_FALSE (vec_len (empty_buffers) < n_left_from))
+    {
+      vlib_node_increment_counter (vm, odp_crypto_esp_decrypt_node.index,
+				   ESP_DECRYPT_ERROR_NO_BUFFER, n_left_from);
+      goto free_buffers_and_exit;
+    }
+
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 i_bi0, o_bi0 = (u32) ~ 0, next0;
+	  vlib_buffer_t *i_b0;
+	  vlib_buffer_t *o_b0 = 0;
+	  esp_header_t *esp0;
+	  ipsec_sa_t *sa0;
+	  u32 sa_index0 = ~0;
+	  u32 seq;
+	  ip4_header_t *ih4 = 0, *oh4 = 0;
+	  ip6_header_t *ih6 = 0, *oh6 = 0;
+	  u8 tunnel_mode = 1;
+	  u8 transport_ip6 = 0;
+	  sa_data_t *sa_sess_data;
+
+
+	  i_bi0 = from[0];
+	  from += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  next0 = ESP_DECRYPT_NEXT_DROP;
+
+	  i_b0 = vlib_get_buffer (vm, i_bi0);
+	  esp0 = vlib_buffer_get_current (i_b0);
+
+	  sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index;
+	  sa0 = pool_elt_at_index (im->sad, sa_index0);
+
+	  seq = clib_host_to_net_u32 (esp0->seq);
+
+	  /* anti-replay check */
+	  if (sa0->use_anti_replay)
+	    {
+	      int rv = 0;
+
+	      if (PREDICT_TRUE (sa0->use_esn))
+		rv = esp_replay_check_esn (sa0, seq);
+	      else
+		rv = esp_replay_check (sa0, seq);
+
+	      if (PREDICT_FALSE (rv))
+		{
+		  clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq);
+		  vlib_node_increment_counter (vm, odp_crypto_esp_decrypt_node.index,
+					       ESP_DECRYPT_ERROR_REPLAY, 1);
+		  o_bi0 = i_bi0;
+		  to_next[0] = o_bi0;
+		  to_next += 1;
+		  goto trace;
+		}
+	    }
+
+	  sa0->total_data_size += i_b0->current_length;
+	  int icv_size = em->esp_integ_algs[sa0->integ_alg].trunc_size;
+
+	  sa_sess_data = pool_elt_at_index (cwm->sa_sess_d[0], sa_index0);
+	  if (PREDICT_FALSE (!(sa_sess_data->sess)))
+	    {
+	      int ret = create_sess (sa0, sa_sess_data, 0);
+
+	      if (ret)
+		{
+		  to_next[0] = i_bi0;
+		  to_next += 1;
+		  goto trace;
+		}
+	    }
+
+	  odp_crypto_op_param_t crypto_op_params;
+	  odp_bool_t posted = 0;
+	  odp_crypto_op_result_t result;
+
+	  crypto_op_params.session = sa_sess_data->sess;
+	  crypto_op_params.ctx = NULL;
+	  crypto_op_params.aad.ptr = NULL;
+	  crypto_op_params.aad.length = 0;
+	  crypto_op_params.pkt = (odp_packet_t) ((u8 *) i_b0 -
+						 (u8 *)
+						 odp_packet_user_area ((odp_packet_t) 0x0));
+	  crypto_op_params.out_pkt = crypto_op_params.pkt;
+
+	  crypto_op_params.override_iv_ptr = sa_sess_data->iv_data;
+
+
+	  if (PREDICT_TRUE (sa0->integ_alg != IPSEC_INTEG_ALG_NONE))
+	    {
+	      i_b0->current_length -= icv_size;
+
+	      crypto_op_params.auth_range.offset = (u32) i_b0->current_data;
+	      crypto_op_params.auth_range.length = i_b0->current_length;
+
+	      crypto_op_params.hash_result_offset =
+		(u32) (i_b0->current_data + i_b0->current_length);
+	    }
+
+	  if (PREDICT_TRUE (sa0->use_anti_replay))
+	    {
+	      if (PREDICT_TRUE (sa0->use_esn))
+		esp_replay_advance_esn (sa0, seq);
+	      else
+		esp_replay_advance (sa0, seq);
+	    }
+
+	  /* grab free buffer */
+	  uword last_empty_buffer = vec_len (empty_buffers) - 1;
+	  o_bi0 = empty_buffers[last_empty_buffer];
+	  to_next[0] = o_bi0;
+	  to_next += 1;
+	  o_b0 = vlib_get_buffer (vm, o_bi0);
+	  vlib_prefetch_buffer_with_index (vm,
+					   empty_buffers[last_empty_buffer -
+							 1], STORE);
+	  _vec_len (empty_buffers) = last_empty_buffer;
+
+	  /* add old buffer to the recycle list */
+	  vec_add1 (recycle, i_bi0);
+
+	  if (sa0->crypto_alg >= IPSEC_CRYPTO_ALG_AES_CBC_128 &&
+	      sa0->crypto_alg <= IPSEC_CRYPTO_ALG_AES_CBC_256)
+	    {
+	      const int BLOCK_SIZE = 16;
+	      const int IV_SIZE = 16;
+	      esp_footer_t *f0;
+	      u8 ip_hdr_size = 0;
+
+	      int blocks =
+		(i_b0->current_length - sizeof (esp_header_t) -
+		 IV_SIZE) / BLOCK_SIZE;
+
+	      o_b0->current_data = sizeof (ethernet_header_t);
+
+	      /* transport mode */
+	      if (PREDICT_FALSE (!sa0->is_tunnel && !sa0->is_tunnel_ip6))
+		{
+		  tunnel_mode = 0;
+		  ih4 =
+		    (ip4_header_t *) (i_b0->data +
+				      sizeof (ethernet_header_t));
+		  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;
+			  ip_hdr_size = sizeof (ip6_header_t);
+			  ih6 =
+			    (ip6_header_t *) (i_b0->data +
+					      sizeof (ethernet_header_t));
+			  oh6 = vlib_buffer_get_current (o_b0);
+			}
+		      else
+			{
+			  vlib_node_increment_counter (vm,
+						       odp_crypto_esp_decrypt_node.index,
+						       ESP_DECRYPT_ERROR_NOT_IP,
+						       1);
+			  o_b0 = 0;
+			  goto trace;
+			}
+		    }
+		  else
+		    {
+		      oh4 = vlib_buffer_get_current (o_b0);
+		      ip_hdr_size = sizeof (ip4_header_t);
+		    }
+		}
+
+	      crypto_op_params.cipher_range.offset =
+		(u32) ((u8 *) vlib_buffer_get_current (i_b0) - (u8 *) i_b0) -
+		sizeof (vlib_buffer_t) + sizeof (esp_header_t) + IV_SIZE;
+	      crypto_op_params.cipher_range.length = BLOCK_SIZE * blocks;
+	      crypto_op_params.override_iv_ptr =
+		(u8 *) vlib_buffer_get_current (i_b0) + sizeof (esp_header_t);
+
+	      odp_crypto_operation (&crypto_op_params, &posted, &result);
+
+	      if (PREDICT_FALSE (!result.ok))
+		{
+		  vlib_node_increment_counter (vm, odp_crypto_esp_decrypt_node.index,
+					       ESP_DECRYPT_ERROR_INTEG_ERROR,
+					       1);
+		  o_b0 = 0;
+		  goto trace;
+		}
+
+	      clib_memcpy ((u8 *) vlib_buffer_get_current (o_b0) +
+			   ip_hdr_size, esp0->data + IV_SIZE,
+			   BLOCK_SIZE * blocks);
+
+	      o_b0->current_length = (blocks * 16) - 2 + ip_hdr_size;
+	      o_b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
+	      f0 =
+		(esp_footer_t *) ((u8 *) vlib_buffer_get_current (o_b0) +
+				  o_b0->current_length);
+	      o_b0->current_length -= f0->pad_length;
+
+	      /* tunnel mode */
+	      if (PREDICT_TRUE (tunnel_mode))
+		{
+		  if (PREDICT_TRUE (f0->next_header == IP_PROTOCOL_IP_IN_IP))
+		    {
+		      next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
+		      oh4 = vlib_buffer_get_current (o_b0);
+		    }
+		  else if (f0->next_header == IP_PROTOCOL_IPV6)
+		    next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
+		  else
+		    {
+		      clib_warning ("next header: 0x%x", f0->next_header);
+		      vlib_node_increment_counter (vm,
+						   odp_crypto_esp_decrypt_node.index,
+						   ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
+						   1);
+		      o_b0 = 0;
+		      goto trace;
+		    }
+		}
+	      /* transport mode */
+	      else
+		{
+		  if (PREDICT_FALSE (transport_ip6))
+		    {
+		      next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
+		      oh6->ip_version_traffic_class_and_flow_label =
+			ih6->ip_version_traffic_class_and_flow_label;
+		      oh6->protocol = f0->next_header;
+		      oh6->hop_limit = ih6->hop_limit;
+		      oh6->src_address.as_u64[0] = ih6->src_address.as_u64[0];
+		      oh6->src_address.as_u64[1] = ih6->src_address.as_u64[1];
+		      oh6->dst_address.as_u64[0] = ih6->dst_address.as_u64[0];
+		      oh6->dst_address.as_u64[1] = ih6->dst_address.as_u64[1];
+		      oh6->payload_length =
+			clib_host_to_net_u16 (vlib_buffer_length_in_chain
+					      (vm,
+					       o_b0) - sizeof (ip6_header_t));
+		    }
+		  else
+		    {
+		      next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
+		      oh4->ip_version_and_header_length = 0x45;
+		      oh4->tos = ih4->tos;
+		      oh4->fragment_id = 0;
+		      oh4->flags_and_fragment_offset = 0;
+		      oh4->ttl = ih4->ttl;
+		      oh4->protocol = f0->next_header;
+		      oh4->src_address.as_u32 = ih4->src_address.as_u32;
+		      oh4->dst_address.as_u32 = ih4->dst_address.as_u32;
+		      oh4->length =
+			clib_host_to_net_u16 (vlib_buffer_length_in_chain
+					      (vm, o_b0));
+		      oh4->checksum = ip4_header_checksum (oh4);
+		    }
+		}
+
+	      /* for IPSec-GRE tunnel next node is ipsec-gre-input */
+	      if (PREDICT_FALSE
+		  ((vnet_buffer (i_b0)->ipsec.flags) &
+		   IPSEC_FLAG_IPSEC_GRE_TUNNEL))
+		next0 = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT;
+
+	      vnet_buffer (o_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+	    }
+
+	trace:
+	  if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      if (o_b0)
+		{
+		  o_b0->flags |= VLIB_BUFFER_IS_TRACED;
+		  o_b0->trace_index = i_b0->trace_index;
+		  esp_decrypt_trace_t *tr =
+		    vlib_add_trace (vm, node, o_b0, sizeof (*tr));
+		  tr->crypto_alg = sa0->crypto_alg;
+		  tr->integ_alg = sa0->integ_alg;
+		}
+	    }
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, o_bi0, next0);
+	}
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+  vlib_node_increment_counter (vm, odp_crypto_esp_decrypt_node.index,
+			       ESP_DECRYPT_ERROR_RX_PKTS,
+			       from_frame->n_vectors);
+
+free_buffers_and_exit:
+  if (recycle)
+    vlib_buffer_free (vm, recycle, vec_len (recycle));
+  vec_free (recycle);
+  return from_frame->n_vectors;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (odp_crypto_esp_decrypt_node) = {
+  .function = esp_decrypt_node_fn,
+  .name = "odp-crypto-esp-decrypt",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_decrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
+  .error_strings = esp_decrypt_error_strings,
+
+  .n_next_nodes = ESP_DECRYPT_N_NEXT,
+  .next_nodes = {
+#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
+    foreach_esp_decrypt_next
+#undef _
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (odp_crypto_esp_decrypt_node, esp_decrypt_node_fn)
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */