In-band OAM active probe (VPP-471)

Change-Id: Icf0ddf76ba1c8b588c79387284cd0349ebc6e45f
Signed-off-by: AkshayaNadahalli <anadahal@cisco.com>

1 files changed, 803 insertions, 0 deletions

diff --git a/src/plugins/ioam/udp-ping/udp_ping_node.c b/src/plugins/ioam/udp-ping/udp_ping_node.c
new file mode 100644
index 00000000000..4de8fe2f894
--- /dev/null
+++ b/src/plugins/ioam/udp-ping/udp_ping_node.c
@@ -0,0 +1,803 @@
+/*
+ * Copyright (c) 2017 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 <vlib/vlib.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip6_hop_by_hop.h>
+#include <ioam/encap/ip6_ioam_trace.h>
+#include <ioam/encap/ip6_ioam_e2e.h>
+#include <ioam/udp-ping/udp_ping_packet.h>
+#include <ioam/udp-ping/udp_ping.h>
+#include <ioam/udp-ping/udp_ping_util.h>
+#include <vnet/sr/sr_packet.h>
+
+typedef enum
+{
+  UDP_PING_NEXT_DROP,
+  UDP_PING_NEXT_PUNT,
+  UDP_PING_NEXT_UDP_LOOKUP,
+  UDP_PING_NEXT_ICMP,
+  UDP_PING_NEXT_IP6_LOOKUP,
+  UDP_PING_NEXT_IP6_DROP,
+  UDP_PING_N_NEXT,
+} udp_ping_next_t;
+
+udp_ping_main_t udp_ping_main;
+
+uword
+udp_ping_process (vlib_main_t * vm,
+		  vlib_node_runtime_t * rt, vlib_frame_t * f);
+
+extern int
+ip6_hbh_ioam_trace_data_list_handler (vlib_buffer_t * b, ip6_header_t * ip,
+				      ip6_hop_by_hop_option_t * opt);
+
+typedef struct
+{
+  ip6_address_t src;
+  ip6_address_t dst;
+  u16 src_port;
+  u16 dst_port;
+  u16 handle;
+  u16 next_index;
+  u8 msg_type;
+} udp_ping_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_udp_ping_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 *);
+  udp_ping_trace_t *t = va_arg (*args, udp_ping_trace_t *);
+
+  s = format (s, "udp-ping-local: src %U, dst %U, src_port %u, dst_port %u "
+	      "handle %u, next_index %u, msg_type %u",
+	      format_ip6_address, &t->src,
+	      format_ip6_address, &t->dst,
+	      t->src_port, t->dst_port,
+	      t->handle, t->next_index, t->msg_type);
+  return s;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (udp_ping_node, static) =
+{
+  .function = udp_ping_process,
+  .type = VLIB_NODE_TYPE_PROCESS,
+  .name = "udp-ping-process",
+};
+/* *INDENT-ON* */
+
+void
+udp_ping_calculate_timer_interval (void)
+{
+  int i;
+  ip46_udp_ping_flow *flow = NULL;
+  u16 min_interval = 0x1e9;
+
+  for (i = 0; i < vec_len (udp_ping_main.ip46_flow); i++)
+    {
+      if (pool_is_free_index (udp_ping_main.ip46_flow, i))
+	continue;
+
+      flow = pool_elt_at_index (udp_ping_main.ip46_flow, i);
+
+      if (min_interval > flow->udp_data.interval)
+	min_interval = flow->udp_data.interval;
+    }
+
+  if (udp_ping_main.timer_interval != min_interval)
+    {
+      udp_ping_main.timer_interval = min_interval;
+      vlib_process_signal_event (udp_ping_main.vlib_main,
+				 udp_ping_node.index, EVENT_SIG_RECHECK, 0);
+    }
+}
+
+void
+ip46_udp_ping_set_flow (ip46_address_t src, ip46_address_t dst,
+			u16 start_src_port, u16 end_src_port,
+			u16 start_dst_port, u16 end_dst_port,
+			u16 interval, u8 fault_det, u8 is_disable)
+{
+  u8 found = 0;
+  ip46_udp_ping_flow *flow = NULL;
+  int i;
+
+  for (i = 0; i < vec_len (udp_ping_main.ip46_flow); i++)
+    {
+      if (pool_is_free_index (udp_ping_main.ip46_flow, i))
+	continue;
+
+      flow = pool_elt_at_index (udp_ping_main.ip46_flow, i);
+      if ((0 == udp_ping_compare_flow (src, dst,
+				       start_src_port, end_src_port,
+				       start_dst_port, end_dst_port, flow)))
+	{
+	  found = 1;
+	  break;
+	}
+    }
+
+  if (found)
+    {
+      u16 cur_interval;
+      if (is_disable)
+	{
+	  cur_interval = flow->udp_data.interval;
+	  udp_ping_free_flow_data (flow);
+	  pool_put_index (udp_ping_main.ip46_flow, i);
+	  if (udp_ping_main.timer_interval == interval)
+	    udp_ping_calculate_timer_interval ();
+	  return;
+	}
+
+      cur_interval = flow->udp_data.interval;
+      flow->udp_data.interval = interval;
+      if (udp_ping_main.timer_interval > interval)
+	{
+	  udp_ping_main.timer_interval = interval;
+	  vlib_process_signal_event (udp_ping_main.vlib_main,
+				     udp_ping_node.index,
+				     EVENT_SIG_RECHECK, 0);
+	}
+      else if (udp_ping_main.timer_interval == cur_interval)
+	udp_ping_calculate_timer_interval ();
+
+      return;
+    }
+
+  /* Delete operation and item not found */
+  if (is_disable)
+    return;
+
+  /* Alloc new session */
+  pool_get_aligned (udp_ping_main.ip46_flow, flow, CLIB_CACHE_LINE_BYTES);
+  udp_ping_populate_flow (src, dst,
+			  start_src_port, end_src_port,
+			  start_dst_port, end_dst_port,
+			  interval, fault_det, flow);
+
+  udp_ping_create_rewrite (flow, (flow - udp_ping_main.ip46_flow));
+
+  if (udp_ping_main.timer_interval > interval)
+    {
+      udp_ping_main.timer_interval = interval;
+      vlib_process_signal_event (udp_ping_main.vlib_main,
+				 udp_ping_node.index, EVENT_SIG_RECHECK, 0);
+    }
+  return;
+}
+
+uword
+unformat_port_range (unformat_input_t * input, va_list * args)
+{
+  u16 *start_port, *end_port;
+  uword c;
+  u8 colon_present = 0;
+
+  start_port = va_arg (*args, u16 *);
+  end_port = va_arg (*args, u16 *);
+
+  *start_port = *end_port = 0;
+  /* Get start port */
+  while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
+    {
+      switch (c)
+	{
+	case '0' ... '9':
+	  *start_port = ((*start_port) * 10) + (c - '0');
+	  break;
+
+	case ':':
+	  colon_present = 1;
+	  break;
+
+	default:
+	  return 0;
+	}
+
+      if (colon_present)
+	break;
+    }
+
+  if (!colon_present)
+    return 0;
+
+  /* Get end port */
+  while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
+    {
+      switch (c)
+	{
+	case '0' ... '9':
+	  *end_port = ((*end_port) * 10) + (c - '0');
+	  break;
+
+	default:
+	  return 1;
+	}
+    }
+
+  if (end_port < start_port)
+    return 0;
+
+  return 1;
+}
+
+static clib_error_t *
+set_udp_ping_command_fn (vlib_main_t * vm,
+			 unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  ip46_address_t dst, src;
+  u16 start_src_port, end_src_port;
+  u16 start_dst_port, end_dst_port;
+  u32 interval;
+  u8 is_disable = 0;
+  u8 fault_det = 0;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat
+	  (input, "src %U", unformat_ip46_address, &src, IP46_TYPE_ANY))
+	;
+      else if (unformat (input, "src-port-range %U",
+			 unformat_port_range, &start_src_port, &end_src_port))
+	;
+      else
+	if (unformat
+	    (input, "dst %U", unformat_ip46_address, &dst, IP46_TYPE_ANY))
+	;
+      else if (unformat (input, "dst-port-range %U",
+			 unformat_port_range, &start_dst_port, &end_dst_port))
+	;
+      else if (unformat (input, "interval %d", &interval))
+	;
+      else if (unformat (input, "fault-detect"))
+	fault_det = 1;
+      else if (unformat (input, "disable"))
+	is_disable = 1;
+      else
+	break;
+    }
+
+  ip46_udp_ping_set_flow (src, dst, start_src_port, end_src_port,
+			  start_dst_port, end_dst_port, (u16) interval,
+			  fault_det, is_disable);
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (set_udp_ping_command, static) =
+{
+  .path = "set udp-ping",
+  .short_help =
+      "set udp-ping src <local IPv6 address>  src-port-range <local port range> \
+      dst <remote IPv6 address> dst-port-range <destination port range> \
+      interval <time interval in sec for which ping packet will be sent> \
+      [disable]",
+  .function = set_udp_ping_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+show_udp_ping_summary_cmd_fn (vlib_main_t * vm,
+			      unformat_input_t * input,
+			      vlib_cli_command_t * cmd)
+{
+  u8 *s = 0;
+  int i, j;
+  ip46_udp_ping_flow *ip46_flow;
+  u16 src_port, dst_port;
+  udp_ping_flow_data *stats;
+
+  s = format (s, "UDP-Ping data:\n");
+
+  for (i = 0; i < vec_len (udp_ping_main.ip46_flow); i++)
+    {
+      if (pool_is_free_index (udp_ping_main.ip46_flow, i))
+	continue;
+
+      ip46_flow = pool_elt_at_index (udp_ping_main.ip46_flow, i);
+      s = format (s, "Src: %U, Dst: %U\n",
+		  format_ip46_address, &ip46_flow->src, IP46_TYPE_ANY,
+		  format_ip46_address, &ip46_flow->dst, IP46_TYPE_ANY);
+
+      s = format (s, "Start src port: %u, End src port: %u\n",
+		  ip46_flow->udp_data.start_src_port,
+		  ip46_flow->udp_data.end_src_port);
+      s = format (s, "Start dst port: %u, End dst port: %u\n",
+		  ip46_flow->udp_data.start_dst_port,
+		  ip46_flow->udp_data.end_dst_port);
+      s = format (s, "Interval: %u\n", ip46_flow->udp_data.interval);
+
+      j = 0;
+      for (src_port = ip46_flow->udp_data.start_src_port;
+	   src_port <= ip46_flow->udp_data.end_src_port; src_port++)
+	{
+	  for (dst_port = ip46_flow->udp_data.start_dst_port;
+	       dst_port <= ip46_flow->udp_data.end_dst_port; dst_port++)
+	    {
+	      stats = ip46_flow->udp_data.stats + j;
+	      s =
+		format (s, "\nSrc Port - %u, Dst Port - %u, Flow CTX - %u\n",
+			src_port, dst_port, stats->flow_ctx);
+	      s =
+		format (s, "Path State - %s\n",
+			(stats->retry > MAX_PING_RETRIES) ? "Down" : "Up");
+	      s = format (s, "Path Data:\n");
+	      s = print_analyse_flow (s,
+				      &ip46_flow->udp_data.
+				      stats[j].analyse_data);
+	      j++;
+	    }
+	}
+      s = format (s, "\n\n");
+    }
+
+  vlib_cli_output (vm, "%v", s);
+  vec_free (s);
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_udp_ping_cmd, static) =
+{
+  .path = "show udp-ping summary",
+  .short_help = "Summary of udp-ping",
+  .function = show_udp_ping_summary_cmd_fn,
+};
+/* *INDENT-ON* */
+
+/**
+ * @brief UDP-Ping Process node.
+ * @node udp-ping-process
+ *
+ * This is process node which wakes up when periodically to send
+ * out udp probe packets for all configured sessions.
+ *
+ * @param vm    vlib_main_t corresponding to the current thread.
+ * @param node  vlib_node_runtime_t data for this node.
+ * @param frame vlib_frame_t whose contents should be dispatched.
+ *
+ */
+uword
+udp_ping_process (vlib_main_t * vm,
+		  vlib_node_runtime_t * rt, vlib_frame_t * f)
+{
+  f64 now;
+  uword *event_data = 0;
+  int i;
+  ip46_udp_ping_flow *ip46_flow;
+
+  while (1)
+    {
+      vec_reset_length (event_data);
+      vlib_process_wait_for_event_or_clock (vm, udp_ping_main.timer_interval);
+      (void) vlib_process_get_events (vm, &event_data);
+      now = vlib_time_now (vm);
+
+      for (i = 0; i < vec_len (udp_ping_main.ip46_flow); i++)
+	{
+	  if (pool_is_free_index (udp_ping_main.ip46_flow, i))
+	    continue;
+
+	  ip46_flow = pool_elt_at_index (udp_ping_main.ip46_flow, i);
+	  if (ip46_flow->udp_data.next_send_time < now)
+	    udp_ping_send_ip6_pak (udp_ping_main.vlib_main, ip46_flow);
+	}
+    }
+  return 0;
+}
+
+/**
+ * @brief HopByHop analyse function for udp-ping response.
+ *
+ * Walks through all hbh options present in udp-ping response
+ * and uses analyser library for the analysis.
+ *
+ */
+void
+udp_ping_analyse_hbh (vlib_buffer_t * b0,
+		      u32 flow_id,
+		      u16 src_port,
+		      u16 dst_port,
+		      ip6_hop_by_hop_option_t * opt0,
+		      ip6_hop_by_hop_option_t * limit0, u16 len)
+{
+  u8 type0;
+  ip46_udp_ping_flow *ip46_flow;
+  u16 flow_index;
+  ioam_analyser_data_t *data;
+  ioam_e2e_option_t *e2e;
+  ioam_trace_option_t *trace;
+
+  ip46_flow = udp_ping_main.ip46_flow + flow_id;
+  flow_index = (src_port - ip46_flow->udp_data.start_src_port) *
+    (ip46_flow->udp_data.end_dst_port - ip46_flow->udp_data.start_dst_port +
+     1);
+  flow_index += (dst_port - ip46_flow->udp_data.start_dst_port);
+  data = &(ip46_flow->udp_data.stats[flow_index].analyse_data);
+
+  data->pkt_counter++;
+  data->bytes_counter += len;
+
+  vnet_buffer (b0)->l2_classify.opaque_index =
+    ip46_flow->udp_data.stats[flow_index].flow_ctx;
+
+  while (opt0 < limit0)
+    {
+      type0 = opt0->type;
+      switch (type0)
+	{
+	case HBH_OPTION_TYPE_IOAM_TRACE_DATA_LIST:
+	  /* Add trace for here as it hasnt been done yet */
+	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
+	  trace = (ioam_trace_option_t *) opt0;
+	  if (PREDICT_FALSE
+	      (trace->trace_hdr.ioam_trace_type & BIT_LOOPBACK_REPLY))
+	    {
+	      ip6_ioam_analyse_hbh_trace_loopback (data, &trace->trace_hdr,
+						   (trace->hdr.length - 2));
+	      return;
+	    }
+	  ip6_hbh_ioam_trace_data_list_handler (b0,
+						vlib_buffer_get_current (b0),
+						opt0);
+	  (void) ip6_ioam_analyse_hbh_trace (data, &trace->trace_hdr, len,
+					     (trace->hdr.length - 2));
+	  break;
+	case HBH_OPTION_TYPE_IOAM_EDGE_TO_EDGE:
+	  e2e = (ioam_e2e_option_t *) opt0;
+	  (void) ip6_ioam_analyse_hbh_e2e (data, &e2e->e2e_hdr, len);
+	  break;
+	case 0:		/* Pad1 */
+	  opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
+	  continue;
+	case 1:		/* PadN */
+	  break;
+	default:
+	  break;
+	}
+      opt0 = (ip6_hop_by_hop_option_t *) (((u8 *) opt0) + opt0->length +
+					  sizeof (ip6_hop_by_hop_option_t));
+    }
+  ip46_flow->udp_data.stats[flow_index].retry = 0;
+}
+
+/**
+ * @brief UDP-Ping request/response handler function.
+ *
+ * Checks udp-ping packet type - request/response and handles them.
+ * If not udp-ping packet then, strips off hbh options and enques
+ * packet to protocol registered node to enable next protocol processing.
+ *
+ */
+void
+udp_ping_local_analyse (vlib_buffer_t * b0,
+			ip6_header_t * ip0,
+			ip6_hop_by_hop_header_t * hbh0, u16 * next0)
+{
+  ip6_main_t *im = &ip6_main;
+  ip_lookup_main_t *lm = &im->lookup_main;
+
+  *next0 = UDP_PING_NEXT_IP6_DROP;
+
+  if (PREDICT_TRUE (hbh0->protocol == IP_PROTOCOL_UDP))
+    {
+      ip6_hop_by_hop_option_t *opt0;
+      ip6_hop_by_hop_option_t *limit0;
+      u16 p_len0;
+      udp_ping_t *udp0;
+
+      /* Check for udp ping packet */
+      udp0 = (udp_ping_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3));
+      opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
+      if ((udp0->ping_data.probe_marker1 ==
+	   clib_host_to_net_u32 (UDP_PING_PROBE_MARKER1)) &&
+	  (udp0->ping_data.probe_marker2 ==
+	   clib_host_to_net_u32 (UDP_PING_PROBE_MARKER2)))
+	{
+	  if (udp0->ping_data.msg_type == UDP_PING_PROBE)
+	    {
+	      udp_ping_create_reply_from_probe_ip6 (ip0, hbh0, udp0);
+	      /* Skip e2e processing */
+	      vnet_buffer (b0)->l2_classify.opaque_index = 0x7FFFFFFF;
+	      *next0 = UDP_PING_NEXT_IP6_LOOKUP;
+	      return;
+	    }
+
+	  /* Reply */
+	  opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
+	  limit0 = (ip6_hop_by_hop_option_t *)
+	    ((u8 *) hbh0 + ((hbh0->length + 1) << 3));
+	  p_len0 = clib_net_to_host_u16 (ip0->payload_length);
+	  udp_ping_analyse_hbh (b0,
+				clib_net_to_host_u16 (udp0->
+						      ping_data.sender_handle),
+				clib_net_to_host_u16 (udp0->udp.dst_port),
+				clib_net_to_host_u16 (udp0->udp.src_port),
+				opt0, limit0, p_len0);
+
+	  /* UDP Ping packet, so return */
+	  return;
+	}
+    }
+
+  /* If next header is SR, then destination may get overwritten to
+   * remote address. So pass it to SR processing as it may be local packet
+   * afterall
+   */
+  if (PREDICT_FALSE (hbh0->protocol == IPPROTO_IPV6_ROUTE))
+    goto end;
+
+  /* Other case remove hbh-ioam headers */
+  u64 *copy_dst0, *copy_src0;
+  u16 new_l0;
+
+  vlib_buffer_advance (b0, (hbh0->length + 1) << 3);
+
+  new_l0 = clib_net_to_host_u16 (ip0->payload_length) -
+    ((hbh0->length + 1) << 3);
+
+  ip0->payload_length = clib_host_to_net_u16 (new_l0);
+
+  ip0->protocol = hbh0->protocol;
+
+  copy_src0 = (u64 *) ip0;
+  copy_dst0 = copy_src0 + (hbh0->length + 1);
+  copy_dst0[4] = copy_src0[4];
+  copy_dst0[3] = copy_src0[3];
+  copy_dst0[2] = copy_src0[2];
+  copy_dst0[1] = copy_src0[1];
+  copy_dst0[0] = copy_src0[0];
+
+end:
+  *next0 = lm->local_next_by_ip_protocol[hbh0->protocol];
+  return;
+}
+
+/**
+ * @brief udp ping request/response packet receive node.
+ * @node udp-ping-local
+ *
+ * This function receives udp ping request/response packets and process them.
+ * For request packets, response is created and sent.
+ * For response packets, they are analysed and results stored.
+ *
+ * @param vm    vlib_main_t corresponding to the current thread.
+ * @param node  vlib_node_runtime_t data for this node.
+ * @param frame vlib_frame_t whose contents should be dispatched.
+ *
+ * @par Graph mechanics: buffer, next index usage
+ *
+ * <em>Uses:</em>
+ * - <code>udp_ping_local_analyse(p0, ip0, hbh0, &next0)</code>
+ *     - Checks packet type - request/respnse and process them.
+ *
+ * <em>Next Index:</em>
+ * - Dispatches the packet to ip6-lookup/ip6-drop depending on type of packet.
+ */
+static uword
+udp_ping_local_node_fn (vlib_main_t * vm,
+			vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  udp_ping_next_t next_index;
+  u32 *from, *to_next, n_left_from, n_left_to_next;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+	  vlib_buffer_t *p0, *p1;
+	  ip6_header_t *ip0, *ip1;
+	  ip6_hop_by_hop_header_t *hbh0, *hbh1;
+	  u16 next0, next1;
+	  u32 pi0, pi1;
+
+	  /* 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);
+
+	    /* Prefetch 3 cache lines as we need to look deep into packet */
+	    CLIB_PREFETCH (p2->data, 3 * CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p3->data, 3 * CLIB_CACHE_LINE_BYTES, STORE);
+	  }
+
+	  pi0 = to_next[0] = from[0];
+	  pi1 = to_next[1] = from[1];
+	  from += 2;
+	  n_left_from -= 2;
+	  to_next += 2;
+	  n_left_to_next -= 2;
+
+	  p0 = vlib_get_buffer (vm, pi0);
+	  p1 = vlib_get_buffer (vm, pi1);
+
+	  ip0 = vlib_buffer_get_current (p0);
+	  ip1 = vlib_buffer_get_current (p1);
+
+	  hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
+	  hbh1 = (ip6_hop_by_hop_header_t *) (ip1 + 1);
+
+	  udp_ping_local_analyse (p0, ip0, hbh0, &next0);
+	  udp_ping_local_analyse (p1, ip1, hbh1, &next1);
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+	    {
+	      if (p0->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  udp_ping_trace_t *t0 =
+		    vlib_add_trace (vm, node, p0, sizeof (*t0));
+		  udp_ping_t *udp0;
+
+		  /* Check for udp ping packet */
+		  udp0 =
+		    (udp_ping_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3));
+		  t0->src = ip0->src_address;
+		  t0->dst = ip0->dst_address;
+		  t0->src_port = clib_net_to_host_u16 (udp0->udp.src_port);
+		  t0->dst_port = clib_net_to_host_u16 (udp0->udp.dst_port);
+		  t0->handle =
+		    clib_net_to_host_u16 (udp0->ping_data.sender_handle);
+		  t0->msg_type = udp0->ping_data.msg_type;
+		  t0->next_index = next0;
+		}
+	      if (p1->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  udp_ping_trace_t *t1 =
+		    vlib_add_trace (vm, node, p1, sizeof (*t1));
+		  udp_ping_t *udp1;
+
+		  /* Check for udp ping packet */
+		  udp1 =
+		    (udp_ping_t *) ((u8 *) hbh1 + ((hbh1->length + 1) << 3));
+		  t1->src = ip1->src_address;
+		  t1->dst = ip1->dst_address;
+		  t1->src_port = clib_net_to_host_u16 (udp1->udp.src_port);
+		  t1->dst_port = clib_net_to_host_u16 (udp1->udp.dst_port);
+		  t1->handle =
+		    clib_net_to_host_u16 (udp1->ping_data.sender_handle);
+		  t1->msg_type = udp1->ping_data.msg_type;
+		  t1->next_index = next1;
+		}
+	    }
+
+	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   pi0, pi1, next0, next1);
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *p0;
+	  ip6_header_t *ip0;
+	  ip6_hop_by_hop_header_t *hbh0;
+	  u16 next0;
+	  u32 pi0;
+
+	  pi0 = from[0];
+	  to_next[0] = pi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, pi0);
+	  ip0 = vlib_buffer_get_current (p0);
+	  hbh0 = (ip6_hop_by_hop_header_t *) (ip0 + 1);
+
+	  udp_ping_local_analyse (p0, ip0, hbh0, &next0);
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+	    {
+	      if (p0->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  udp_ping_trace_t *t0 =
+		    vlib_add_trace (vm, node, p0, sizeof (*t0));
+		  udp_ping_t *udp0;
+
+		  /* Check for udp ping packet */
+		  udp0 =
+		    (udp_ping_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3));
+		  t0->src = ip0->src_address;
+		  t0->dst = ip0->dst_address;
+		  t0->src_port = clib_net_to_host_u16 (udp0->udp.src_port);
+		  t0->dst_port = clib_net_to_host_u16 (udp0->udp.dst_port);
+		  t0->handle =
+		    clib_net_to_host_u16 (udp0->ping_data.sender_handle);
+		  t0->msg_type = udp0->ping_data.msg_type;
+		  t0->next_index = next0;
+		}
+	    }
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   pi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+/*
+ * Node for udp-ping-local
+ */
+VLIB_REGISTER_NODE (udp_ping_local, static) =
+{
+  .function = udp_ping_local_node_fn,
+  .name = "udp-ping-local",
+  .vector_size = sizeof (u32),
+  .format_trace = format_udp_ping_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_next_nodes = UDP_PING_N_NEXT,
+  .next_nodes =
+    {
+      [UDP_PING_NEXT_DROP] = "error-drop",
+      [UDP_PING_NEXT_PUNT] = "error-punt",
+      [UDP_PING_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
+      [UDP_PING_NEXT_ICMP] = "ip6-icmp-input",
+      [UDP_PING_NEXT_IP6_LOOKUP] = "ip6-lookup",
+      [UDP_PING_NEXT_IP6_DROP] = "ip6-drop",
+    },
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+udp_ping_init (vlib_main_t * vm)
+{
+  clib_error_t *error = 0;
+
+  udp_ping_main.vlib_main = vm;
+  udp_ping_main.vnet_main = vnet_get_main ();
+  udp_ping_main.timer_interval = 1e9;
+
+  if ((error = vlib_call_init_function (vm, ip_main_init)))
+    return (error);
+
+  ip6_register_protocol (IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS,
+			 udp_ping_local.index);
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (udp_ping_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */