Move doxytags file to html output directory
[vpp.git] / vnet / vnet / ip / ip6_forward.c
index 823daa6..c977960 100644 (file)
@@ -501,7 +501,6 @@ ip6_add_del_route_next_hop (ip6_main_t * im,
   {
     /* create / delete additional mapping of existing adjacency */
     ip6_add_del_route_args_t a;
-    ip_adjacency_t * nh_adj = ip_get_adjacency (lm, nh_adj_index);
 
     a.table_index_or_table_id = fib_index;
     a.flags = ((is_del ? IP6_ROUTE_FLAG_DEL : IP6_ROUTE_FLAG_ADD)
@@ -516,13 +515,6 @@ ip6_add_del_route_next_hop (ip6_main_t * im,
     a.n_add_adj = 0;
 
     ip6_add_del_route (im, &a);
-
-    /* adjust share count. This cannot be the only use of the adjacency 
-       unless next hop is an indiect adj where share count is already
-       incremented */
-    if (next_hop_sw_if_index != ~0) 
-      nh_adj->share_count += is_del ? -1 : 1;
-
     goto done;
   }
 
@@ -773,7 +765,7 @@ ip6_lookup_inline (vlib_main_t * vm,
          ip0 = vlib_buffer_get_current (p0);
          ip1 = vlib_buffer_get_current (p1);
 
-         if (is_indirect)
+         if (PREDICT_FALSE(is_indirect))
            {
              ip_adjacency_t * iadj0, * iadj1;
              iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
@@ -919,7 +911,7 @@ ip6_lookup_inline (vlib_main_t * vm,
 
          ip0 = vlib_buffer_get_current (p0);
 
-         if (is_indirect)
+         if (PREDICT_FALSE(is_indirect))
            {
              ip_adjacency_t * iadj0;
              iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
@@ -1260,65 +1252,96 @@ VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 /* Built-in ip6 unicast rx feature path definition */
 VNET_IP6_UNICAST_FEATURE_INIT (ip6_inacl, static) = {
   .node_name = "ip6-inacl", 
-  .runs_before = {"ipsec-input-ip6", 0}, 
+  .runs_before = ORDER_CONSTRAINTS {"ip6-policer-classify", 0},
   .feature_index = &ip6_main.ip6_unicast_rx_feature_check_access,
 };
 
+VNET_IP6_UNICAST_FEATURE_INIT (ip6_policer_classify, static) = {
+  .node_name = "ip6-policer-classify",
+  .runs_before = ORDER_CONSTRAINTS {"ipsec-input-ip6", 0},
+  .feature_index = &ip6_main.ip6_unicast_rx_feature_policer_classify,
+};
+
 VNET_IP6_UNICAST_FEATURE_INIT (ip6_ipsec, static) = {
   .node_name = "ipsec-input-ip6",
-  .runs_before = {"l2tp-decap", 0},
+  .runs_before = ORDER_CONSTRAINTS {"l2tp-decap", 0},
   .feature_index = &ip6_main.ip6_unicast_rx_feature_ipsec,
 };
 
 VNET_IP6_UNICAST_FEATURE_INIT (ip6_l2tp, static) = {
   .node_name = "l2tp-decap",
-  .runs_before = {"vpath-input-ip6", 0},
+  .runs_before = ORDER_CONSTRAINTS {"vpath-input-ip6", 0},
   .feature_index = &ip6_main.ip6_unicast_rx_feature_l2tp_decap,
 };
 
 VNET_IP6_UNICAST_FEATURE_INIT (ip6_vpath, static) = {
   .node_name = "vpath-input-ip6",
-  .runs_before = {"ip6-lookup", 0},
+  .runs_before = ORDER_CONSTRAINTS {"ip6-lookup", 0},
   .feature_index = &ip6_main.ip6_unicast_rx_feature_vpath,
 };
 
 VNET_IP6_UNICAST_FEATURE_INIT (ip6_lookup, static) = {
   .node_name = "ip6-lookup",
-  .runs_before = {0}, /* not before any other features */
+  .runs_before = 0, /* not before any other features */
   .feature_index = &ip6_main.ip6_unicast_rx_feature_lookup,
 };
 
 /* Built-in ip6 multicast rx feature path definition (none now) */
-VNET_IP6_MULTICAST_FEATURE_INIT (ip4_vpath_mc, static) = {
+VNET_IP6_MULTICAST_FEATURE_INIT (ip6_vpath_mc, static) = {
   .node_name = "vpath-input-ip6",
-  .runs_before = {"ip6-lookup", 0},
+  .runs_before = ORDER_CONSTRAINTS {"ip6-lookup", 0},
   .feature_index = &ip6_main.ip6_multicast_rx_feature_vpath,
 };
 
 VNET_IP6_MULTICAST_FEATURE_INIT (ip6_lookup, static) = {
   .node_name = "ip6-lookup",
-  .runs_before = {0}, /* not before any other features */
+  .runs_before = 0, /* not before any other features */
   .feature_index = &ip6_main.ip6_multicast_rx_feature_lookup,
 };
 
-static char * feature_start_nodes[] = 
+static char * rx_feature_start_nodes[] = 
   {"ip6-input"};
 
+static char * tx_feature_start_nodes[] = 
+  {"ip6-rewrite"};
+
+/* Built-in ip4 tx feature path definition */
+VNET_IP6_TX_FEATURE_INIT (interface_output, static) = {
+  .node_name = "interface-output",
+  .runs_before = 0, /* not before any other features */
+  .feature_index = &ip6_main.ip6_tx_feature_interface_output,
+};
+
 static clib_error_t *
 ip6_feature_init (vlib_main_t * vm, ip6_main_t * im)
 {
   ip_lookup_main_t * lm = &im->lookup_main;
   clib_error_t * error;
   vnet_cast_t cast;
+  ip_config_main_t * cm;
+  vnet_config_main_t * vcm;
+  char **feature_start_nodes;
+  int feature_start_len;
   
-  for (cast = 0; cast < VNET_N_CAST; cast++)
+  for (cast = 0; cast < VNET_N_IP_FEAT; cast++)
     {
-      ip_config_main_t * cm = &lm->rx_config_mains[cast];
-      vnet_config_main_t * vcm = &cm->config_main;
+      cm = &lm->feature_config_mains[cast];
+      vcm = &cm->config_main;
       
+      if (cast < VNET_IP_TX_FEAT)
+        {
+          feature_start_nodes = rx_feature_start_nodes;
+          feature_start_len = ARRAY_LEN(rx_feature_start_nodes);
+        }
+      else
+        {
+          feature_start_nodes = tx_feature_start_nodes;
+          feature_start_len = ARRAY_LEN(tx_feature_start_nodes);
+        }
+
       if ((error = ip_feature_init_cast (vm, cm, vcm, 
                                          feature_start_nodes,
-                                         ARRAY_LEN(feature_start_nodes),
+                                         feature_start_len,
                                          cast,
                                          0 /* is_ip4 */)))
         return error;
@@ -1337,18 +1360,20 @@ ip6_sw_interface_add_del (vnet_main_t * vnm,
   u32 ci, cast;
   u32 feature_index;
 
-  for (cast = 0; cast < VNET_N_CAST; cast++)
+  for (cast = 0; cast < VNET_N_IP_FEAT; cast++)
     {
-      ip_config_main_t * cm = &lm->rx_config_mains[cast];
+      ip_config_main_t * cm = &lm->feature_config_mains[cast];
       vnet_config_main_t * vcm = &cm->config_main;
 
       vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
       ci = cm->config_index_by_sw_if_index[sw_if_index];
 
-      if (cast == VNET_UNICAST)
+      if (cast == VNET_IP_RX_UNICAST_FEAT)
         feature_index = im->ip6_unicast_rx_feature_lookup;
-      else
+      else if (cast == VNET_IP_RX_MULTICAST_FEAT)
         feature_index = im->ip6_multicast_rx_feature_lookup;
+      else 
+        feature_index = im->ip6_tx_feature_interface_output;
 
       if (is_add)
        ci = vnet_config_add_feature (vm, vcm,
@@ -1364,6 +1389,9 @@ ip6_sw_interface_add_del (vnet_main_t * vnm,
                                      /* # bytes of config data */ 0);
 
       cm->config_index_by_sw_if_index[sw_if_index] = ci;
+      /* 
+       * note: do not update the tx feature count here.
+       */
     }
   return /* no error */ 0;
 }
@@ -1391,7 +1419,7 @@ VLIB_REGISTER_NODE (ip6_lookup_node) = {
   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup);
 
 static uword
 ip6_indirect (vlib_main_t * vm,
@@ -1411,7 +1439,7 @@ VLIB_REGISTER_NODE (ip6_indirect_node) = {
   .n_next_nodes = 0,
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_indirect_node, ip6_indirect)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_indirect_node, ip6_indirect);
 
 typedef struct {
   /* Adjacency taken. */
@@ -1619,7 +1647,7 @@ VLIB_REGISTER_NODE (ip6_drop_node,static) = {
   },
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop);
 
 VLIB_REGISTER_NODE (ip6_punt_node,static) = {
   .function = ip6_punt,
@@ -1634,7 +1662,7 @@ VLIB_REGISTER_NODE (ip6_punt_node,static) = {
   },
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt);
 
 VLIB_REGISTER_NODE (ip6_miss_node,static) = {
   .function = ip6_miss,
@@ -1649,7 +1677,7 @@ VLIB_REGISTER_NODE (ip6_miss_node,static) = {
   },
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_miss_node, ip6_miss)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_miss_node, ip6_miss);
 
 VLIB_REGISTER_NODE (ip6_multicast_node,static) = {
   .function = ip6_drop,
@@ -2029,7 +2057,7 @@ VLIB_REGISTER_NODE (ip6_local_node,static) = {
   },
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local);
 
 void ip6_register_protocol (u32 protocol, u32 node_index)
 {
@@ -2348,6 +2376,7 @@ ip6_rewrite_inline (vlib_main_t * vm,
   u32 n_left_from, n_left_to_next, * to_next, next_index;
   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
   vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
+  ip_config_main_t * cm = &lm->feature_config_mains[VNET_IP_TX_FEAT];
 
   n_left_from = frame->n_vectors;
   next_index = node->cached_next_index;
@@ -2364,6 +2393,7 @@ ip6_rewrite_inline (vlib_main_t * vm,
          ip6_header_t * ip0, * ip1;
          u32 pi0, rw_len0, next0, error0, adj_index0;
          u32 pi1, rw_len1, next1, error1, adj_index1;
+          u32 tx_sw_if_index0, tx_sw_if_index1;
       
          /* Prefetch next iteration. */
          {
@@ -2460,6 +2490,8 @@ ip6_rewrite_inline (vlib_main_t * vm,
 
          rw_len0 = adj0[0].rewrite_header.data_bytes;
          rw_len1 = adj1[0].rewrite_header.data_bytes;
+          vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
+          vnet_buffer(p1)->ip.save_rewrite_length = rw_len1;
 
          vlib_increment_combined_counter (&lm->adjacency_counters,
                                            cpu_index, 
@@ -2487,18 +2519,46 @@ ip6_rewrite_inline (vlib_main_t * vm,
               p0->current_data -= rw_len0;
               p0->current_length += rw_len0;
 
+              tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
               vnet_buffer (p0)->sw_if_index[VLIB_TX] =
-                  adj0[0].rewrite_header.sw_if_index;
+                  tx_sw_if_index0;
               next0 = adj0[0].rewrite_header.next_index;
+
+              if (PREDICT_FALSE 
+                  (clib_bitmap_get (lm->tx_sw_if_has_ip_output_features, 
+                                    tx_sw_if_index0)))
+                {
+                  p0->current_config_index = 
+                    vec_elt (cm->config_index_by_sw_if_index, 
+                             tx_sw_if_index0);
+                  vnet_get_config_data (&cm->config_main,
+                                        &p0->current_config_index,
+                                        &next0,
+                                        /* # bytes of config data */ 0);
+                }
             }
           if (PREDICT_TRUE(error1 == IP6_ERROR_NONE))
             {
               p1->current_data -= rw_len1;
               p1->current_length += rw_len1;
 
-             vnet_buffer (p1)->sw_if_index[VLIB_TX] =
-                  adj1[0].rewrite_header.sw_if_index;
+              tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
+              vnet_buffer (p1)->sw_if_index[VLIB_TX] =
+                  tx_sw_if_index1;
               next1 = adj1[0].rewrite_header.next_index;
+
+              if (PREDICT_FALSE 
+                  (clib_bitmap_get (lm->tx_sw_if_has_ip_output_features, 
+                                    tx_sw_if_index1)))
+                {
+                  p1->current_config_index = 
+                    vec_elt (cm->config_index_by_sw_if_index, 
+                             tx_sw_if_index1);
+                  vnet_get_config_data (&cm->config_main,
+                                        &p1->current_config_index,
+                                        &next1,
+                                        /* # bytes of config data */ 0);
+                }
             }
 
          /* Guess we are only writing on simple Ethernet header. */
@@ -2518,6 +2578,7 @@ ip6_rewrite_inline (vlib_main_t * vm,
          ip6_header_t * ip0;
          u32 pi0, rw_len0;
          u32 adj_index0, next0, error0;
+          u32 tx_sw_if_index0;
       
          pi0 = to_next[0] = from[0];
 
@@ -2572,6 +2633,7 @@ ip6_rewrite_inline (vlib_main_t * vm,
       
          /* Update packet buffer attributes/set output interface. */
          rw_len0 = adj0[0].rewrite_header.data_bytes;
+          vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
 
          vlib_increment_combined_counter (&lm->adjacency_counters,
                                            cpu_index, 
@@ -2591,9 +2653,23 @@ ip6_rewrite_inline (vlib_main_t * vm,
              p0->current_data -= rw_len0;
              p0->current_length += rw_len0;
 
-             vnet_buffer (p0)->sw_if_index[VLIB_TX] =
-                  adj0[0].rewrite_header.sw_if_index;
+              tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
+
+              vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
               next0 = adj0[0].rewrite_header.next_index;
+
+              if (PREDICT_FALSE 
+                  (clib_bitmap_get (lm->tx_sw_if_has_ip_output_features, 
+                                    tx_sw_if_index0)))
+                  {
+                    p0->current_config_index = 
+                      vec_elt (cm->config_index_by_sw_if_index, 
+                               tx_sw_if_index0);
+                    vnet_get_config_data (&cm->config_main,
+                                          &p0->current_config_index,
+                                          &next0,
+                                          /* # bytes of config data */ 0);
+                  }
             }
 
          p0->error = error_node->errors[error0];
@@ -2650,7 +2726,7 @@ VLIB_REGISTER_NODE (ip6_rewrite_node) = {
   },
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite_transit)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite_transit);
 
 VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
   .function = ip6_rewrite_local,
@@ -2664,7 +2740,7 @@ VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
   .n_next_nodes = 0,
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_local_node, ip6_rewrite_local)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_local_node, ip6_rewrite_local);
 
 /*
  * Hop-by-Hop handling
@@ -2742,6 +2818,76 @@ format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
   return s;
 }
 
+always_inline u8 ip6_scan_hbh_options (
+                                      vlib_buffer_t * b0,
+                                      ip6_header_t *ip0,
+                                      ip6_hop_by_hop_header_t *hbh0,
+                                      ip6_hop_by_hop_option_t *opt0,
+                                      ip6_hop_by_hop_option_t *limit0,
+                                      u32 *next0)
+{
+  ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
+  u8 type0;
+  u8 error0 = 0;
+
+  while (opt0 < limit0)
+    {
+      type0 = opt0->type;
+      switch (type0)
+       {
+       case 0: /* Pad1 */
+         opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
+         continue;
+       case 1: /* PadN */
+         break;
+       default:
+         if (hm->options[type0])
+           {
+             if ((*hm->options[type0])(b0, ip0, opt0) < 0)
+               {
+                 error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
+                 return(error0);
+               }
+           }
+         else
+           {
+             /* Unrecognized mandatory option, check the two high order bits */
+             switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
+               {
+               case HBH_OPTION_TYPE_SKIP_UNKNOWN:
+                 break;
+               case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
+                 error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
+                 *next0 = IP_LOOKUP_NEXT_DROP;
+                 break;
+               case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
+                 error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
+                 *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
+                 icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
+                                             ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
+                 break;
+               case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
+                 error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
+                 if (!ip6_address_is_multicast(&ip0->dst_address))
+                   {
+                     *next0 =  IP_LOOKUP_NEXT_ICMP_ERROR;
+                     icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
+                                                 ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
+                   }
+                 else
+                   {
+                     *next0 =  IP_LOOKUP_NEXT_DROP;
+                   }
+                 break;
+               }
+             return(error0);
+           }
+       }
+      opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
+    }
+  return(error0);
+}
+
 /*
  * Process the Hop-by-Hop Options header
  */
@@ -2766,6 +2912,116 @@ ip6_hop_by_hop (vlib_main_t * vm,
 
     vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 
+    while (n_left_from >= 4 && n_left_to_next >= 2) {
+      u32 bi0, bi1;
+      vlib_buffer_t * b0, *b1;
+      u32 next0, next1;
+      ip6_header_t * ip0, *ip1;
+      ip6_hop_by_hop_header_t *hbh0, *hbh1;
+      ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
+      u8 error0 = 0, error1 = 0;
+
+      /* Prefetch next iteration. */
+      {
+       vlib_buffer_t * p2, * p3;
+
+       p2 = vlib_get_buffer (vm, from[2]);
+       p3 = vlib_get_buffer (vm, from[3]);
+
+       vlib_prefetch_buffer_header (p2, LOAD);
+       vlib_prefetch_buffer_header (p3, LOAD);
+
+       CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+       CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
+      }
+
+      /* Speculatively enqueue b0, b1 to the current next frame */
+      to_next[0] = bi0 = from[0];
+      to_next[1] = bi1 = from[1];
+      from += 2;
+      to_next += 2;
+      n_left_from -= 2;
+      n_left_to_next -= 2;
+
+      b0 = vlib_get_buffer (vm, bi0);
+      b1 = vlib_get_buffer (vm, bi1);
+      u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+      ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
+      u32 adj_index1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+      ip_adjacency_t *adj1 = ip_get_adjacency(lm, adj_index1);
+
+      /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
+      next0 = adj0->lookup_next_index;
+      next1 = adj1->lookup_next_index;
+
+      ip0 = vlib_buffer_get_current (b0);
+      ip1 = vlib_buffer_get_current (b1);
+      hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
+      hbh1 = (ip6_hop_by_hop_header_t *)(ip1+1);
+      opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
+      opt1 = (ip6_hop_by_hop_option_t *)(hbh1+1);
+      limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
+      limit1 = (ip6_hop_by_hop_option_t *)((u8 *)hbh1 + ((hbh1->length + 1) << 3));
+
+      /*
+       * Basic validity checks
+       */
+      if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
+       error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
+       next0 = IP_LOOKUP_NEXT_DROP;
+       goto outdual;
+      }
+      /* Scan the set of h-b-h options, process ones that we understand */
+      error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
+
+      if ((hbh1->length + 1) << 3 > clib_net_to_host_u16(ip1->payload_length)) {
+       error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
+       next1 = IP_LOOKUP_NEXT_DROP;
+       goto outdual;
+      }
+      /* Scan the set of h-b-h options, process ones that we understand */
+      error1 = ip6_scan_hbh_options(b1,ip1,hbh1,opt1,limit1, &next1);
+
+    outdual:
+      /* Has the classifier flagged this buffer for special treatment? */
+      if ((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index == OI_DECAP))
+       next0 = hm->next_override;
+
+      /* Has the classifier flagged this buffer for special treatment? */
+      if ((error1 == 0) && (vnet_buffer(b1)->l2_classify.opaque_index == OI_DECAP))
+       next1 = hm->next_override;
+
+      if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
+       {
+         if (b0->flags & VLIB_BUFFER_IS_TRACED) {
+           ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
+           u32 trace_len = (hbh0->length + 1) << 3;
+           t->next_index = next0;
+           /* Capture the h-b-h option verbatim */
+           trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
+           t->trace_len = trace_len;
+           clib_memcpy(t->option_data, hbh0, trace_len);
+         }
+         if (b1->flags & VLIB_BUFFER_IS_TRACED) {
+           ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b1, sizeof (*t));
+           u32 trace_len = (hbh1->length + 1) << 3;
+           t->next_index = next1;
+           /* Capture the h-b-h option verbatim */
+           trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
+           t->trace_len = trace_len;
+           clib_memcpy(t->option_data, hbh1, trace_len);
+         }
+
+       }
+
+      b0->error = error_node->errors[error0];
+      b1->error = error_node->errors[error1];
+
+      /* verify speculative enqueue, maybe switch current next frame */
+      vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0,
+                                      bi1,next0, next1);
+    }
+
     while (n_left_from > 0 && n_left_to_next > 0) {
       u32 bi0;
       vlib_buffer_t * b0;
@@ -2773,7 +3029,6 @@ ip6_hop_by_hop (vlib_main_t * vm,
       ip6_header_t * ip0;
       ip6_hop_by_hop_header_t *hbh0;
       ip6_hop_by_hop_option_t *opt0, *limit0;
-      u8 type0;
       u8 error0 = 0;
 
       /* Speculatively enqueue b0 to the current next frame */
@@ -2805,54 +3060,12 @@ ip6_hop_by_hop (vlib_main_t * vm,
       }
 
       /* Scan the set of h-b-h options, process ones that we understand */
-      while (opt0 < limit0) {
-       type0 = opt0->type;
-       switch (type0) {
-       case 0: /* Pad1 */
-         opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
-         continue;
-       case 1: /* PadN */
-         break;
-       default:
-         if (hm->options[type0]) {
-           if ((*hm->options[type0])(b0, ip0, opt0) < 0) {
-             error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
-             goto out0;
-           }
-         } else {
-           /* Unrecognized mandatory option, check the two high order bits */
-           switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS) {
-           case HBH_OPTION_TYPE_SKIP_UNKNOWN:
-             break;
-           case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
-             next0 = IP_LOOKUP_NEXT_DROP;
-             break;
-           case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
-             next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
-             icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
-                                         ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
-             break;
-           case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
-             if (!ip6_address_is_multicast(&ip0->dst_address)) {
-               next0 =  IP_LOOKUP_NEXT_ICMP_ERROR;
-               icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
-                                           ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
-             } else {
-               next0 =  IP_LOOKUP_NEXT_DROP;
-             }
-             break;
-           }
-           error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
-           goto out0;
-         }
-       }
-       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
-      }
+      error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
 
     out0:
       /* Has the classifier flagged this buffer for special treatment? */
       if ((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index == OI_DECAP))
-       next0 = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
+       next0 = hm->next_override;
 
       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
        ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
@@ -2886,7 +3099,7 @@ VLIB_REGISTER_NODE (ip6_hop_by_hop_node) = {
   .n_next_nodes = 0,
 };
 
-VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
 
 static clib_error_t *
 ip6_hop_by_hop_init (vlib_main_t * vm)
@@ -2894,12 +3107,19 @@ ip6_hop_by_hop_init (vlib_main_t * vm)
   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
   memset(hm->options, 0, sizeof(hm->options));
   memset(hm->trace, 0, sizeof(hm->trace));
-
+  hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
   return (0);
 }
 
 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
 
+void ip6_hbh_set_next_override (uword next)
+{
+  ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
+
+  hm->next_override = next;
+}
+
 int
 ip6_hbh_register_option (u8 option,
                         int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
@@ -3077,7 +3297,7 @@ add_del_ip6_interface_table (vlib_main_t * vm,
   return error;
 }
 
-VLIB_CLI_COMMAND (set_interface_ip_table_command, static) = {
+VLIB_CLI_COMMAND (set_interface_ip6_table_command, static) = {
   .path = "set interface ip6 table",
   .function = add_del_ip6_interface_table,
   .short_help = "set interface ip6 table <intfc> <table-id>"
@@ -3222,7 +3442,7 @@ show_ip6_local_command_fn (vlib_main_t * vm,
 
 
 
-VLIB_CLI_COMMAND (show_ip_local, static) = {
+VLIB_CLI_COMMAND (show_ip6_local, static) = {
   .path = "show ip6 local",
   .function = show_ip6_local_command_fn,
   .short_help = "Show ip6 local protocol table",
@@ -3330,3 +3550,43 @@ ip6_config (vlib_main_t * vm, unformat_input_t * input)
 
 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
 
+#define TEST_CODE 1
+#if TEST_CODE > 0
+
+static clib_error_t *
+set_interface_ip6_output_feature_command_fn (vlib_main_t * vm,
+                                             unformat_input_t * input,
+                                             vlib_cli_command_t * cmd)
+{
+  vnet_main_t * vnm = vnet_get_main();
+  u32 sw_if_index = ~0;
+  int is_add = 1;
+  ip6_main_t * im = &ip6_main;
+  ip_lookup_main_t * lm = &im->lookup_main;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) 
+    {
+      if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
+        ;
+      else if (unformat (input, "del"))
+        is_add = 0;
+      else
+        break;
+    }
+
+  if (sw_if_index == ~0)
+    return clib_error_return (0, "unknown interface `%U'",
+                              format_unformat_error, input);
+
+  lm->tx_sw_if_has_ip_output_features =
+    clib_bitmap_set (lm->tx_sw_if_has_ip_output_features, sw_if_index, is_add);
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND (set_interface_ip6_output_feature, static) = {
+  .path = "set interface ip6 output feature",
+  .function = set_interface_ip6_output_feature_command_fn,
+  .short_help = "set interface output feature <intfc>",
+};
+#endif /* TEST_CODE */