ipsec: Support MPLS over IPSec[46] interface

Type: feature

Signed-off-by: Neale Ranns <nranns@cisco.com>
Change-Id: I89dc3815eabfee135cd5b3c910dea5e2e2ef1333

7 files changed, 227 insertions, 101 deletions

diff --git a/src/vnet/ipsec/esp.h b/src/vnet/ipsec/esp.h
index 01210157734..d24b5ea4102 100644
--- a/src/vnet/ipsec/esp.h
+++ b/src/vnet/ipsec/esp.h
@@ -235,6 +235,7 @@ typedef struct
   u32 esp6_post_next;
   u32 esp4_tun_post_next;
   u32 esp6_tun_post_next;
+  u32 esp_mpls_tun_post_next;
 } esp_async_post_next_t;
 
 extern esp_async_post_next_t esp_encrypt_async_next;
diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 1390f80a1ba..f5b6232dbd8 100644
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -27,12 +27,13 @@
 
 #include <vnet/gre/packet.h>
 
-#define foreach_esp_decrypt_next                \
-_(DROP, "error-drop")                           \
-_(IP4_INPUT, "ip4-input-no-checksum")           \
-_(IP6_INPUT, "ip6-input")                       \
-_(L2_INPUT, "l2-input")                         \
-_(HANDOFF, "handoff")
+#define foreach_esp_decrypt_next                                              \
+  _ (DROP, "error-drop")                                                      \
+  _ (IP4_INPUT, "ip4-input-no-checksum")                                      \
+  _ (IP6_INPUT, "ip6-input")                                                  \
+  _ (L2_INPUT, "l2-input")                                                    \
+  _ (MPLS_INPUT, "mpls-input")                                                \
+  _ (HANDOFF, "handoff")
 
 #define _(v, s) ESP_DECRYPT_NEXT_##v,
 typedef enum
@@ -42,11 +43,12 @@ typedef enum
     ESP_DECRYPT_N_NEXT,
 } esp_decrypt_next_t;
 
-#define foreach_esp_decrypt_post_next                  \
-_(DROP, "error-drop")                                  \
-_(IP4_INPUT, "ip4-input-no-checksum")                  \
-_(IP6_INPUT, "ip6-input")                              \
-_(L2_INPUT, "l2-input")
+#define foreach_esp_decrypt_post_next                                         \
+  _ (DROP, "error-drop")                                                      \
+  _ (IP4_INPUT, "ip4-input-no-checksum")                                      \
+  _ (IP6_INPUT, "ip6-input")                                                  \
+  _ (MPLS_INPUT, "mpls-input")                                                \
+  _ (L2_INPUT, "l2-input")
 
 #define _(v, s) ESP_DECRYPT_POST_NEXT_##v,
 typedef enum
@@ -913,6 +915,13 @@ esp_decrypt_post_crypto (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  b->current_length = pd->current_length - adv;
 	  esp_remove_tail (vm, b, lb, tail);
 	}
+      else if (next_header == IP_PROTOCOL_MPLS_IN_IP)
+	{
+	  next[0] = ESP_DECRYPT_NEXT_MPLS_INPUT;
+	  b->current_data = pd->current_data + adv;
+	  b->current_length = pd->current_length - adv;
+	  esp_remove_tail (vm, b, lb, tail);
+	}
       else
 	{
 	  if (is_tun && next_header == IP_PROTOCOL_GRE)
@@ -1457,6 +1466,7 @@ VLIB_REGISTER_NODE (esp4_decrypt_node) = {
     [ESP_DECRYPT_NEXT_DROP] = "ip4-drop",
     [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
+    [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-drop",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-handoff",
   },
@@ -1488,6 +1498,7 @@ VLIB_REGISTER_NODE (esp6_decrypt_node) = {
     [ESP_DECRYPT_NEXT_DROP] = "ip6-drop",
     [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
+    [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-drop",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF]=  "esp6-decrypt-handoff",
   },
@@ -1517,6 +1528,7 @@ VLIB_REGISTER_NODE (esp4_decrypt_tun_node) = {
     [ESP_DECRYPT_NEXT_DROP] = "ip4-drop",
     [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
+    [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF] = "esp4-decrypt-tun-handoff",
   },
@@ -1546,6 +1558,7 @@ VLIB_REGISTER_NODE (esp6_decrypt_tun_node) = {
     [ESP_DECRYPT_NEXT_DROP] = "ip6-drop",
     [ESP_DECRYPT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
     [ESP_DECRYPT_NEXT_IP6_INPUT] = "ip6-input",
+    [ESP_DECRYPT_NEXT_MPLS_INPUT] = "mpls-input",
     [ESP_DECRYPT_NEXT_L2_INPUT] = "l2-input",
     [ESP_DECRYPT_NEXT_HANDOFF]=  "esp6-decrypt-tun-handoff",
   },
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index a2316944acd..bd6e7641f4a 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -26,12 +26,14 @@
 #include <vnet/ipsec/esp.h>
 #include <vnet/tunnel/tunnel_dp.h>
 
-#define foreach_esp_encrypt_next                   \
-_(DROP4, "ip4-drop")                               \
-_(DROP6, "ip6-drop")                               \
-_(HANDOFF4, "handoff4")                            \
-_(HANDOFF6, "handoff6")                            \
-_(INTERFACE_OUTPUT, "interface-output")
+#define foreach_esp_encrypt_next                                              \
+  _ (DROP4, "ip4-drop")                                                       \
+  _ (DROP6, "ip6-drop")                                                       \
+  _ (DROP_MPLS, "mpls-drop")                                                  \
+  _ (HANDOFF4, "handoff4")                                                    \
+  _ (HANDOFF6, "handoff6")                                                    \
+  _ (HANDOFF_MPLS, "handoff-mpls")                                            \
+  _ (INTERFACE_OUTPUT, "interface-output")
 
 #define _(v, s) ESP_ENCRYPT_NEXT_##v,
 typedef enum
@@ -555,8 +557,8 @@ out:
 }
 
 always_inline uword
-esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-		    vlib_frame_t * frame, int is_ip6, int is_tun,
+esp_encrypt_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+		    vlib_frame_t *frame, vnet_link_t lt, int is_tun,
 		    u16 async_next)
 {
   ipsec_main_t *im = &ipsec_main;
@@ -578,7 +580,14 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   vnet_crypto_async_frame_t *async_frame = 0;
   int is_async = im->async_mode;
   vnet_crypto_async_op_id_t last_async_op = ~0;
-  u16 drop_next = (is_ip6 ? ESP_ENCRYPT_NEXT_DROP6 : ESP_ENCRYPT_NEXT_DROP4);
+  u16 drop_next =
+    (lt == VNET_LINK_IP6 ? ESP_ENCRYPT_NEXT_DROP6 :
+			   (lt == VNET_LINK_IP4 ? ESP_ENCRYPT_NEXT_DROP4 :
+						  ESP_ENCRYPT_NEXT_DROP_MPLS));
+  u16 handoff_next = (lt == VNET_LINK_IP6 ?
+			ESP_ENCRYPT_NEXT_HANDOFF6 :
+			(lt == VNET_LINK_IP4 ? ESP_ENCRYPT_NEXT_HANDOFF4 :
+					       ESP_ENCRYPT_NEXT_HANDOFF_MPLS));
   u16 n_async_drop = 0;
 
   vlib_get_buffers (vm, from, b, n_left);
@@ -672,9 +681,7 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       if (PREDICT_FALSE (thread_index != sa0->encrypt_thread_index))
 	{
 	  esp_set_next_index (is_async, from, nexts, from[b - bufs],
-			      &n_async_drop,
-			      (is_ip6 ? ESP_ENCRYPT_NEXT_HANDOFF6 :
-			       ESP_ENCRYPT_NEXT_HANDOFF4), next);
+			      &n_async_drop, handoff_next, next);
 	  goto trace;
 	}
 
@@ -746,20 +753,30 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      ip6 = (ip6_header_t *) (payload - hdr_len);
 	      clib_memcpy_fast (ip6, &sa0->ip6_hdr, sizeof (ip6_header_t));
 
-	      if (is_ip6)
+	      if (VNET_LINK_IP6 == lt)
 		{
 		  *next_hdr_ptr = IP_PROTOCOL_IPV6;
 		  tunnel_encap_fixup_6o6 (sa0->tunnel_flags,
 					  (const ip6_header_t *) payload,
 					  ip6);
 		}
-	      else
+	      else if (VNET_LINK_IP4 == lt)
 		{
 		  *next_hdr_ptr = IP_PROTOCOL_IP_IN_IP;
 		  tunnel_encap_fixup_4o6 (sa0->tunnel_flags,
 					  (const ip4_header_t *) payload,
 					  ip6);
 		}
+	      else if (VNET_LINK_MPLS == lt)
+		{
+		  *next_hdr_ptr = IP_PROTOCOL_MPLS_IN_IP;
+		  tunnel_encap_fixup_mplso6 (
+		    sa0->tunnel_flags, (const mpls_unicast_header_t *) payload,
+		    ip6);
+		}
+	      else
+		ASSERT (0);
+
 	      len = payload_len_total + hdr_len - len;
 	      ip6->payload_length = clib_net_to_host_u16 (len);
 	    }
@@ -771,20 +788,30 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	      ip4 = (ip4_header_t *) (payload - hdr_len);
 	      clib_memcpy_fast (ip4, &sa0->ip4_hdr, sizeof (ip4_header_t));
 
-	      if (is_ip6)
+	      if (VNET_LINK_IP6 == lt)
 		{
 		  *next_hdr_ptr = IP_PROTOCOL_IPV6;
 		  tunnel_encap_fixup_6o4_w_chksum (sa0->tunnel_flags,
 						   (const ip6_header_t *)
 						   payload, ip4);
 		}
-	      else
+	      else if (VNET_LINK_IP4 == lt)
 		{
 		  *next_hdr_ptr = IP_PROTOCOL_IP_IN_IP;
 		  tunnel_encap_fixup_4o4_w_chksum (sa0->tunnel_flags,
 						   (const ip4_header_t *)
 						   payload, ip4);
 		}
+	      else if (VNET_LINK_MPLS == lt)
+		{
+		  *next_hdr_ptr = IP_PROTOCOL_MPLS_IN_IP;
+		  tunnel_encap_fixup_mplso4_w_chksum (
+		    sa0->tunnel_flags, (const mpls_unicast_header_t *) payload,
+		    ip4);
+		}
+	      else
+		ASSERT (0);
+
 	      len = payload_len_total + hdr_len;
 	      esp_update_ip4_hdr (ip4, len, /* is_transport */ 0, 0);
 	    }
@@ -806,9 +833,10 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  u16 udp_len = 0;
 	  u8 *old_ip_hdr = vlib_buffer_get_current (b[0]);
 
-	  ip_len = is_ip6 ?
-	    esp_get_ip6_hdr_len ((ip6_header_t *) old_ip_hdr, &ext_hdr) :
-	    ip4_header_bytes ((ip4_header_t *) old_ip_hdr);
+	  ip_len =
+	    (VNET_LINK_IP6 == lt ?
+	       esp_get_ip6_hdr_len ((ip6_header_t *) old_ip_hdr, &ext_hdr) :
+	       ip4_header_bytes ((ip4_header_t *) old_ip_hdr));
 
 	  vlib_buffer_advance (b[0], ip_len);
 	  payload = vlib_buffer_get_current (b[0]);
@@ -856,7 +884,7 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  else
 	    l2_len = 0;
 
-	  if (is_ip6)
+	  if (VNET_LINK_IP6 == lt)
 	    {
 	      ip6_header_t *ip6 = (ip6_header_t *) (old_ip_hdr);
 	      if (PREDICT_TRUE (NULL == ext_hdr))
@@ -873,7 +901,7 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		clib_host_to_net_u16 (payload_len_total + hdr_len - l2_len -
 				      sizeof (ip6_header_t));
 	    }
-	  else
+	  else if (VNET_LINK_IP4 == lt)
 	    {
 	      u16 len;
 	      ip4_header_t *ip4 = (ip4_header_t *) (old_ip_hdr);
@@ -1096,7 +1124,7 @@ VLIB_NODE_FN (esp4_encrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 0,
+  return esp_encrypt_inline (vm, node, from_frame, VNET_LINK_IP4, 0,
 			     esp_encrypt_async_next.esp4_post_next);
 }
 
@@ -1107,17 +1135,17 @@ VLIB_REGISTER_NODE (esp4_encrypt_node) = {
   .format_trace = format_esp_encrypt_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
 
-  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
   .error_strings = esp_encrypt_error_strings,
 
   .n_next_nodes = ESP_ENCRYPT_N_NEXT,
-  .next_nodes = {
-    [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
-    [ESP_ENCRYPT_NEXT_DROP6] = "ip6-drop",
-    [ESP_ENCRYPT_NEXT_HANDOFF4] = "esp4-encrypt-handoff",
-    [ESP_ENCRYPT_NEXT_HANDOFF6] = "esp6-encrypt-handoff",
-    [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output"
-  },
+  .next_nodes = { [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
+		  [ESP_ENCRYPT_NEXT_DROP6] = "ip6-drop",
+		  [ESP_ENCRYPT_NEXT_DROP_MPLS] = "mpls-drop",
+		  [ESP_ENCRYPT_NEXT_HANDOFF4] = "esp4-encrypt-handoff",
+		  [ESP_ENCRYPT_NEXT_HANDOFF6] = "esp6-encrypt-handoff",
+		  [ESP_ENCRYPT_NEXT_HANDOFF_MPLS] = "error-drop",
+		  [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output" },
 };
 /* *INDENT-ON* */
 
@@ -1145,7 +1173,7 @@ VLIB_NODE_FN (esp6_encrypt_node) (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
 				  vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 0,
+  return esp_encrypt_inline (vm, node, from_frame, VNET_LINK_IP6, 0,
 			     esp_encrypt_async_next.esp6_post_next);
 }
 
@@ -1186,7 +1214,7 @@ VLIB_NODE_FN (esp4_encrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ , 1,
+  return esp_encrypt_inline (vm, node, from_frame, VNET_LINK_IP4, 1,
 			     esp_encrypt_async_next.esp4_tun_post_next);
 }
 
@@ -1204,8 +1232,10 @@ VLIB_REGISTER_NODE (esp4_encrypt_tun_node) = {
   .next_nodes = {
     [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
     [ESP_ENCRYPT_NEXT_DROP6] = "ip6-drop",
+    [ESP_ENCRYPT_NEXT_DROP_MPLS] = "mpls-drop",
     [ESP_ENCRYPT_NEXT_HANDOFF4] = "esp4-encrypt-tun-handoff",
-    [ESP_ENCRYPT_NEXT_HANDOFF6] = "error-drop",
+    [ESP_ENCRYPT_NEXT_HANDOFF6] = "esp6-encrypt-tun-handoff",
+    [ESP_ENCRYPT_NEXT_HANDOFF_MPLS] = "esp-mpls-encrypt-tun-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
   },
 };
@@ -1234,7 +1264,7 @@ VLIB_NODE_FN (esp6_encrypt_tun_node) (vlib_main_t * vm,
 				      vlib_node_runtime_t * node,
 				      vlib_frame_t * from_frame)
 {
-  return esp_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ , 1,
+  return esp_encrypt_inline (vm, node, from_frame, VNET_LINK_IP6, 1,
 			     esp_encrypt_async_next.esp6_tun_post_next);
 }
 
@@ -1252,8 +1282,10 @@ VLIB_REGISTER_NODE (esp6_encrypt_tun_node) = {
   .next_nodes = {
     [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
     [ESP_ENCRYPT_NEXT_DROP6] = "ip6-drop",
-    [ESP_ENCRYPT_NEXT_HANDOFF4] = "error-drop",
+    [ESP_ENCRYPT_NEXT_DROP_MPLS] = "mpls-drop",
+    [ESP_ENCRYPT_NEXT_HANDOFF4] = "esp4-encrypt-tun-handoff",
     [ESP_ENCRYPT_NEXT_HANDOFF6] = "esp6-encrypt-tun-handoff",
+    [ESP_ENCRYPT_NEXT_HANDOFF_MPLS] = "esp-mpls-encrypt-tun-handoff",
     [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
   },
 };
@@ -1273,13 +1305,58 @@ VLIB_REGISTER_NODE (esp6_encrypt_tun_post_node) = {
   .vector_size = sizeof (u32),
   .format_trace = format_esp_post_encrypt_trace,
   .type = VLIB_NODE_TYPE_INTERNAL,
-  .sibling_of = "esp6-encrypt-tun",
+  .sibling_of = "esp-mpls-encrypt-tun",
 
-  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
   .error_strings = esp_encrypt_error_strings,
 };
 /* *INDENT-ON* */
 
+VLIB_NODE_FN (esp_mpls_encrypt_tun_node)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  return esp_encrypt_inline (vm, node, from_frame, VNET_LINK_MPLS, 1,
+			     esp_encrypt_async_next.esp_mpls_tun_post_next);
+}
+
+VLIB_REGISTER_NODE (esp_mpls_encrypt_tun_node) = {
+  .name = "esp-mpls-encrypt-tun",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+
+  .n_next_nodes = ESP_ENCRYPT_N_NEXT,
+  .next_nodes = {
+    [ESP_ENCRYPT_NEXT_DROP4] = "ip4-drop",
+    [ESP_ENCRYPT_NEXT_DROP6] = "ip6-drop",
+    [ESP_ENCRYPT_NEXT_DROP_MPLS] = "mpls-drop",
+    [ESP_ENCRYPT_NEXT_HANDOFF4] = "esp4-encrypt-tun-handoff",
+    [ESP_ENCRYPT_NEXT_HANDOFF6] = "esp6-encrypt-tun-handoff",
+    [ESP_ENCRYPT_NEXT_HANDOFF_MPLS] = "esp-mpls-encrypt-tun-handoff",
+    [ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
+  },
+};
+
+VLIB_NODE_FN (esp_mpls_encrypt_tun_post_node)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  return esp_encrypt_post_inline (vm, node, from_frame);
+}
+
+VLIB_REGISTER_NODE (esp_mpls_encrypt_tun_post_node) = {
+  .name = "esp-mpls-encrypt-tun-post",
+  .vector_size = sizeof (u32),
+  .format_trace = format_esp_post_encrypt_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .sibling_of = "esp-mpls-encrypt-tun",
+
+  .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
+  .error_strings = esp_encrypt_error_strings,
+};
+
 typedef struct
 {
   u32 sa_index;
diff --git a/src/vnet/ipsec/ipsec.c b/src/vnet/ipsec/ipsec.c
index 1d92676706a..b63b2a71160 100644
--- a/src/vnet/ipsec/ipsec.c
+++ b/src/vnet/ipsec/ipsec.c
@@ -208,19 +208,16 @@ ipsec_register_ah_backend (vlib_main_t * vm, ipsec_main_t * im,
 }
 
 u32
-ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
-			    const char *name,
-			    const char *esp4_encrypt_node_name,
-			    const char *esp4_encrypt_node_tun_name,
-			    const char *esp4_decrypt_node_name,
-			    const char *esp4_decrypt_tun_node_name,
-			    const char *esp6_encrypt_node_name,
-			    const char *esp6_encrypt_node_tun_name,
-			    const char *esp6_decrypt_node_name,
-			    const char *esp6_decrypt_tun_node_name,
-			    check_support_cb_t esp_check_support_cb,
-			    add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
-			    enable_disable_cb_t enable_disable_cb)
+ipsec_register_esp_backend (
+  vlib_main_t *vm, ipsec_main_t *im, const char *name,
+  const char *esp4_encrypt_node_name, const char *esp4_encrypt_node_tun_name,
+  const char *esp4_decrypt_node_name, const char *esp4_decrypt_tun_node_name,
+  const char *esp6_encrypt_node_name, const char *esp6_encrypt_node_tun_name,
+  const char *esp6_decrypt_node_name, const char *esp6_decrypt_tun_node_name,
+  const char *esp_mpls_encrypt_node_tun_name,
+  check_support_cb_t esp_check_support_cb,
+  add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
+  enable_disable_cb_t enable_disable_cb)
 {
   ipsec_esp_backend_t *b;
 
@@ -244,6 +241,8 @@ ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
 
   b->esp6_encrypt_tun_node_index =
     vlib_get_node_by_name (vm, (u8 *) esp6_encrypt_node_tun_name)->index;
+  b->esp_mpls_encrypt_tun_node_index =
+    vlib_get_node_by_name (vm, (u8 *) esp_mpls_encrypt_node_tun_name)->index;
   b->esp4_encrypt_tun_node_index =
     vlib_get_node_by_name (vm, (u8 *) esp4_encrypt_node_tun_name)->index;
 
@@ -326,6 +325,7 @@ ipsec_select_esp_backend (ipsec_main_t * im, u32 backend_idx)
   im->esp6_decrypt_tun_next_index = b->esp6_decrypt_tun_next_index;
   im->esp4_encrypt_tun_node_index = b->esp4_encrypt_tun_node_index;
   im->esp6_encrypt_tun_node_index = b->esp6_encrypt_tun_node_index;
+  im->esp_mpls_encrypt_tun_node_index = b->esp_mpls_encrypt_tun_node_index;
 
   if (b->enable_disable_cb)
     {
@@ -373,6 +373,8 @@ crypto_engine_backend_register_post_node (vlib_main_t * vm)
     vnet_crypto_register_post_node (vm, "esp4-encrypt-tun-post");
   eit->esp6_tun_post_next =
     vnet_crypto_register_post_node (vm, "esp6-encrypt-tun-post");
+  eit->esp_mpls_tun_post_next =
+    vnet_crypto_register_post_node (vm, "esp-mpls-encrypt-tun-post");
 
   dit = &esp_decrypt_async_next;
   dit->esp4_post_next =
@@ -423,17 +425,11 @@ ipsec_init (vlib_main_t * vm)
   ASSERT (0 == rv);
   (void) (rv);			// avoid warning
 
-  idx = ipsec_register_esp_backend (vm, im, "crypto engine backend",
-				    "esp4-encrypt",
-				    "esp4-encrypt-tun",
-				    "esp4-decrypt",
-				    "esp4-decrypt-tun",
-				    "esp6-encrypt",
-				    "esp6-encrypt-tun",
-				    "esp6-decrypt",
-				    "esp6-decrypt-tun",
-				    ipsec_check_esp_support,
-				    NULL, crypto_dispatch_enable_disable);
+  idx = ipsec_register_esp_backend (
+    vm, im, "crypto engine backend", "esp4-encrypt", "esp4-encrypt-tun",
+    "esp4-decrypt", "esp4-decrypt-tun", "esp6-encrypt", "esp6-encrypt-tun",
+    "esp6-decrypt", "esp6-decrypt-tun", "esp-mpls-encrypt-tun",
+    ipsec_check_esp_support, NULL, crypto_dispatch_enable_disable);
   im->esp_default_backend = idx;
 
   rv = ipsec_select_esp_backend (im, idx);
@@ -562,6 +558,8 @@ ipsec_init (vlib_main_t * vm)
     vlib_frame_queue_main_init (esp4_encrypt_tun_node.index, 0);
   im->esp6_enc_tun_fq_index =
     vlib_frame_queue_main_init (esp6_encrypt_tun_node.index, 0);
+  im->esp_mpls_enc_tun_fq_index =
+    vlib_frame_queue_main_init (esp_mpls_encrypt_tun_node.index, 0);
   im->esp4_dec_tun_fq_index =
     vlib_frame_queue_main_init (esp4_decrypt_tun_node.index, 0);
   im->esp6_dec_tun_fq_index =
diff --git a/src/vnet/ipsec/ipsec.h b/src/vnet/ipsec/ipsec.h
index 97ef6262f71..c370fb1aed5 100644
--- a/src/vnet/ipsec/ipsec.h
+++ b/src/vnet/ipsec/ipsec.h
@@ -74,6 +74,7 @@ typedef struct
   u32 esp6_decrypt_tun_node_index;
   u32 esp6_decrypt_tun_next_index;
   u32 esp6_encrypt_tun_node_index;
+  u32 esp_mpls_encrypt_tun_node_index;
 } ipsec_esp_backend_t;
 
 typedef struct
@@ -145,6 +146,7 @@ typedef struct
   u32 esp6_decrypt_node_index;
   u32 esp6_decrypt_tun_node_index;
   u32 esp6_encrypt_tun_node_index;
+  u32 esp_mpls_encrypt_tun_node_index;
   u32 ah6_encrypt_node_index;
   u32 ah6_decrypt_node_index;
   /* next node indices */
@@ -201,6 +203,7 @@ typedef struct
   u32 esp6_dec_fq_index;
   u32 esp4_enc_tun_fq_index;
   u32 esp6_enc_tun_fq_index;
+  u32 esp_mpls_enc_tun_fq_index;
   u32 esp4_dec_tun_fq_index;
   u32 esp6_dec_tun_fq_index;
 
@@ -231,6 +234,7 @@ extern vlib_node_registration_t esp6_encrypt_node;
 extern vlib_node_registration_t esp6_decrypt_node;
 extern vlib_node_registration_t esp4_encrypt_tun_node;
 extern vlib_node_registration_t esp6_encrypt_tun_node;
+extern vlib_node_registration_t esp_mpls_encrypt_tun_node;
 extern vlib_node_registration_t esp4_decrypt_tun_node;
 extern vlib_node_registration_t esp6_decrypt_tun_node;
 extern vlib_node_registration_t ipsec4_tun_input_node;
@@ -266,19 +270,16 @@ u32 ipsec_register_ah_backend (vlib_main_t * vm, ipsec_main_t * im,
 			       check_support_cb_t ah_check_support_cb,
 			       add_del_sa_sess_cb_t ah_add_del_sa_sess_cb);
 
-u32 ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
-				const char *name,
-				const char *esp4_encrypt_node_name,
-				const char *esp4_encrypt_tun_node_name,
-				const char *esp4_decrypt_node_name,
-				const char *esp4_decrypt_tun_node_name,
-				const char *esp6_encrypt_node_name,
-				const char *esp6_encrypt_tun_node_name,
-				const char *esp6_decrypt_node_name,
-				const char *esp6_decrypt_tun_node_name,
-				check_support_cb_t esp_check_support_cb,
-				add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
-				enable_disable_cb_t enable_disable_cb);
+u32 ipsec_register_esp_backend (
+  vlib_main_t *vm, ipsec_main_t *im, const char *name,
+  const char *esp4_encrypt_node_name, const char *esp4_encrypt_tun_node_name,
+  const char *esp4_decrypt_node_name, const char *esp4_decrypt_tun_node_name,
+  const char *esp6_encrypt_node_name, const char *esp6_encrypt_tun_node_name,
+  const char *esp6_decrypt_node_name, const char *esp6_decrypt_tun_node_name,
+  const char *esp_mpls_encrypt_tun_node_name,
+  check_support_cb_t esp_check_support_cb,
+  add_del_sa_sess_cb_t esp_add_del_sa_sess_cb,
+  enable_disable_cb_t enable_disable_cb);
 
 int ipsec_select_ah_backend (ipsec_main_t * im, u32 ah_backend_idx);
 int ipsec_select_esp_backend (ipsec_main_t * im, u32 esp_backend_idx);
diff --git a/src/vnet/ipsec/ipsec_handoff.c b/src/vnet/ipsec/ipsec_handoff.c
index 4446f1e523a..87eb801f76f 100644
--- a/src/vnet/ipsec/ipsec_handoff.c
+++ b/src/vnet/ipsec/ipsec_handoff.c
@@ -220,6 +220,15 @@ VLIB_NODE_FN (esp6_encrypt_tun_handoff) (vlib_main_t * vm,
 			true);
 }
 
+VLIB_NODE_FN (esp_mpls_encrypt_tun_handoff)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  ipsec_main_t *im = &ipsec_main;
+
+  return ipsec_handoff (vm, node, from_frame, im->esp_mpls_enc_tun_fq_index,
+			true);
+}
+
 VLIB_NODE_FN (esp4_decrypt_handoff) (vlib_main_t * vm,
 				     vlib_node_runtime_t * node,
 				     vlib_frame_t * from_frame)
@@ -343,6 +352,18 @@ VLIB_REGISTER_NODE (esp6_encrypt_tun_handoff) = {
     [0] = "error-drop",
   },
 };
+VLIB_REGISTER_NODE (esp_mpls_encrypt_tun_handoff) = {
+  .name = "esp-mpls-encrypt-tun-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_ipsec_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(ipsec_handoff_error_strings),
+  .error_strings = ipsec_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
 VLIB_REGISTER_NODE (esp4_decrypt_handoff) = {
   .name = "esp4-decrypt-handoff",
   .vector_size = sizeof (u32),
diff --git a/src/vnet/ipsec/ipsec_tun.c b/src/vnet/ipsec/ipsec_tun.c
index c3f50a6ffe9..ea60ab44a8c 100644
--- a/src/vnet/ipsec/ipsec_tun.c
+++ b/src/vnet/ipsec/ipsec_tun.c
@@ -141,33 +141,48 @@ ipsec_tun_protect_get_adj_next (vnet_link_t linkt,
 {
   ipsec_main_t *im;
   ipsec_sa_t *sa;
-  bool is_ip4;
   u32 next;
 
-
-  if (itp->itp_flags & IPSEC_PROTECT_ITF)
-    is_ip4 = linkt == VNET_LINK_IP4;
-  else
-    is_ip4 = ip46_address_is_ip4 (&itp->itp_tun.src);
+  if (!(itp->itp_flags & IPSEC_PROTECT_ITF))
+    {
+      if (ip46_address_is_ip4 (&itp->itp_tun.src))
+	linkt = VNET_LINK_IP4;
+      else
+	linkt = VNET_LINK_IP6;
+    }
 
   sa = ipsec_sa_get (itp->itp_out_sa);
   im = &ipsec_main;
+  next = 0;
 
   if ((sa->crypto_alg == IPSEC_CRYPTO_ALG_NONE &&
        sa->integ_alg == IPSEC_INTEG_ALG_NONE) &&
       !(itp->itp_flags & IPSEC_PROTECT_ITF))
-    next = (is_ip4 ?
-	    im->esp4_no_crypto_tun_node_index :
-	    im->esp6_no_crypto_tun_node_index);
+    next = (VNET_LINK_IP4 == linkt ? im->esp4_no_crypto_tun_node_index :
+				     im->esp6_no_crypto_tun_node_index);
   else if (itp->itp_flags & IPSEC_PROTECT_L2)
-    next = (is_ip4 ?
-	    im->esp4_encrypt_l2_tun_node_index :
-	    im->esp6_encrypt_l2_tun_node_index);
+    next = (VNET_LINK_IP4 == linkt ? im->esp4_encrypt_l2_tun_node_index :
+				     im->esp6_encrypt_l2_tun_node_index);
   else
-    next = (is_ip4 ?
-	    im->esp4_encrypt_tun_node_index :
-	    im->esp6_encrypt_tun_node_index);
-
+    {
+      switch (linkt)
+	{
+	case VNET_LINK_IP4:
+	  next = im->esp4_encrypt_tun_node_index;
+	  break;
+	case VNET_LINK_IP6:
+	  next = im->esp6_encrypt_tun_node_index;
+	  break;
+	case VNET_LINK_MPLS:
+	  next = im->esp_mpls_encrypt_tun_node_index;
+	  break;
+	case VNET_LINK_ARP:
+	case VNET_LINK_NSH:
+	case VNET_LINK_ETHERNET:
+	  ASSERT (0);
+	  break;
+	}
+    }
   return (next);
 }