Reorganize source tree to use single autotools instance

Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 784 insertions, 0 deletions

diff --git a/src/vnet/ip/icmp4.c b/src/vnet/ip/icmp4.c
new file mode 100644
index 00000000000..c3afff72f26
--- /dev/null
+++ b/src/vnet/ip/icmp4.c
@@ -0,0 +1,784 @@
+/*
+ * 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.
+ */
+/*
+ * ip/icmp4.c: ipv4 icmp
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/ip/ip.h>
+#include <vnet/pg/pg.h>
+
+
+static char *icmp_error_strings[] = {
+#define _(f,s) s,
+  foreach_icmp4_error
+#undef _
+};
+
+static u8 *
+format_ip4_icmp_type_and_code (u8 * s, va_list * args)
+{
+  icmp4_type_t type = va_arg (*args, int);
+  u8 code = va_arg (*args, int);
+  char *t = 0;
+
+#define _(n,f) case n: t = #f; break;
+
+  switch (type)
+    {
+      foreach_icmp4_type;
+
+    default:
+      break;
+    }
+
+#undef _
+
+  if (!t)
+    return format (s, "unknown 0x%x", type);
+
+  s = format (s, "%s", t);
+
+  t = 0;
+  switch ((type << 8) | code)
+    {
+#define _(a,n,f) case (ICMP4_##a << 8) | (n): t = #f; break;
+
+      foreach_icmp4_code;
+
+#undef _
+    }
+
+  if (t)
+    s = format (s, " %s", t);
+
+  return s;
+}
+
+static u8 *
+format_ip4_icmp_header (u8 * s, va_list * args)
+{
+  icmp46_header_t *icmp = va_arg (*args, icmp46_header_t *);
+  u32 max_header_bytes = va_arg (*args, u32);
+
+  /* Nothing to do. */
+  if (max_header_bytes < sizeof (icmp[0]))
+    return format (s, "ICMP header truncated");
+
+  s = format (s, "ICMP %U checksum 0x%x",
+	      format_ip4_icmp_type_and_code, icmp->type, icmp->code,
+	      clib_net_to_host_u16 (icmp->checksum));
+
+  return s;
+}
+
+static u8 *
+format_icmp_input_trace (u8 * s, va_list * va)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
+  icmp_input_trace_t *t = va_arg (*va, icmp_input_trace_t *);
+
+  s = format (s, "%U",
+	      format_ip4_header, t->packet_data, sizeof (t->packet_data));
+
+  return s;
+}
+
+typedef enum
+{
+  ICMP_INPUT_NEXT_ERROR,
+  ICMP_INPUT_N_NEXT,
+} icmp_input_next_t;
+
+typedef struct
+{
+  uword *type_and_code_by_name;
+
+  uword *type_by_name;
+
+  /* Vector dispatch table indexed by [icmp type]. */
+  u8 ip4_input_next_index_by_type[256];
+} icmp4_main_t;
+
+icmp4_main_t icmp4_main;
+
+static uword
+ip4_icmp_input (vlib_main_t * vm,
+		vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  icmp4_main_t *im = &icmp4_main;
+  uword n_packets = frame->n_vectors;
+  u32 *from, *to_next;
+  u32 n_left_from, n_left_to_next, next;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = n_packets;
+  next = node->cached_next_index;
+
+  if (node->flags & VLIB_NODE_FLAG_TRACE)
+    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+				   /* stride */ 1,
+				   sizeof (icmp_input_trace_t));
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *p0;
+	  ip4_header_t *ip0;
+	  icmp46_header_t *icmp0;
+	  icmp4_type_t type0;
+	  u32 bi0, next0;
+
+	  if (PREDICT_TRUE (n_left_from > 2))
+	    {
+	      vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
+	      p0 = vlib_get_buffer (vm, from[1]);
+	      ip0 = vlib_buffer_get_current (p0);
+	      CLIB_PREFETCH (ip0, CLIB_CACHE_LINE_BYTES, LOAD);
+	    }
+
+	  bi0 = to_next[0] = from[0];
+
+	  from += 1;
+	  n_left_from -= 1;
+	  to_next += 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, bi0);
+	  ip0 = vlib_buffer_get_current (p0);
+	  icmp0 = ip4_next_header (ip0);
+	  type0 = icmp0->type;
+	  next0 = im->ip4_input_next_index_by_type[type0];
+
+	  p0->error = node->errors[ICMP4_ERROR_UNKNOWN_TYPE];
+	  if (PREDICT_FALSE (next0 != next))
+	    {
+	      vlib_put_next_frame (vm, node, next, n_left_to_next + 1);
+	      next = next0;
+	      vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
+	      to_next[0] = bi0;
+	      to_next += 1;
+	      n_left_to_next -= 1;
+	    }
+	}
+
+      vlib_put_next_frame (vm, node, next, n_left_to_next);
+    }
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_icmp_input_node,static) = {
+  .function = ip4_icmp_input,
+  .name = "ip4-icmp-input",
+
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_icmp_input_trace,
+
+  .n_errors = ARRAY_LEN (icmp_error_strings),
+  .error_strings = icmp_error_strings,
+
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [ICMP_INPUT_NEXT_ERROR] = "error-punt",
+  },
+};
+/* *INDENT-ON* */
+
+static uword
+ip4_icmp_echo_request (vlib_main_t * vm,
+		       vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  uword n_packets = frame->n_vectors;
+  u32 *from, *to_next;
+  u32 n_left_from, n_left_to_next, next;
+  ip4_main_t *i4m = &ip4_main;
+  u16 *fragment_ids, *fid;
+  u8 host_config_ttl = i4m->host_config.ttl;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = n_packets;
+  next = node->cached_next_index;
+
+  if (node->flags & VLIB_NODE_FLAG_TRACE)
+    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+				   /* stride */ 1,
+				   sizeof (icmp_input_trace_t));
+
+  /* Get random fragment IDs for replies. */
+  fid = fragment_ids = clib_random_buffer_get_data (&vm->random_buffer,
+						    n_packets *
+						    sizeof (fragment_ids[0]));
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
+
+      while (n_left_from > 2 && n_left_to_next > 2)
+	{
+	  vlib_buffer_t *p0, *p1;
+	  ip4_header_t *ip0, *ip1;
+	  icmp46_header_t *icmp0, *icmp1;
+	  u32 bi0, src0, dst0;
+	  u32 bi1, src1, dst1;
+	  ip_csum_t sum0, sum1;
+
+	  bi0 = to_next[0] = from[0];
+	  bi1 = to_next[1] = from[1];
+
+	  from += 2;
+	  n_left_from -= 2;
+	  to_next += 2;
+	  n_left_to_next -= 2;
+
+	  p0 = vlib_get_buffer (vm, bi0);
+	  p1 = vlib_get_buffer (vm, bi1);
+	  ip0 = vlib_buffer_get_current (p0);
+	  ip1 = vlib_buffer_get_current (p1);
+	  icmp0 = ip4_next_header (ip0);
+	  icmp1 = ip4_next_header (ip1);
+
+	  vnet_buffer (p0)->sw_if_index[VLIB_RX] =
+	    vnet_main.local_interface_sw_if_index;
+	  vnet_buffer (p1)->sw_if_index[VLIB_RX] =
+	    vnet_main.local_interface_sw_if_index;
+
+	  /* Update ICMP checksum. */
+	  sum0 = icmp0->checksum;
+	  sum1 = icmp1->checksum;
+
+	  ASSERT (icmp0->type == ICMP4_echo_request);
+	  ASSERT (icmp1->type == ICMP4_echo_request);
+	  sum0 = ip_csum_update (sum0, ICMP4_echo_request, ICMP4_echo_reply,
+				 icmp46_header_t, type);
+	  sum1 = ip_csum_update (sum1, ICMP4_echo_request, ICMP4_echo_reply,
+				 icmp46_header_t, type);
+	  icmp0->type = ICMP4_echo_reply;
+	  icmp1->type = ICMP4_echo_reply;
+
+	  icmp0->checksum = ip_csum_fold (sum0);
+	  icmp1->checksum = ip_csum_fold (sum1);
+
+	  src0 = ip0->src_address.data_u32;
+	  src1 = ip1->src_address.data_u32;
+	  dst0 = ip0->dst_address.data_u32;
+	  dst1 = ip1->dst_address.data_u32;
+
+	  /* Swap source and destination address.
+	     Does not change checksum. */
+	  ip0->src_address.data_u32 = dst0;
+	  ip1->src_address.data_u32 = dst1;
+	  ip0->dst_address.data_u32 = src0;
+	  ip1->dst_address.data_u32 = src1;
+
+	  /* Update IP checksum. */
+	  sum0 = ip0->checksum;
+	  sum1 = ip1->checksum;
+
+	  sum0 = ip_csum_update (sum0, ip0->ttl, host_config_ttl,
+				 ip4_header_t, ttl);
+	  sum1 = ip_csum_update (sum1, ip1->ttl, host_config_ttl,
+				 ip4_header_t, ttl);
+	  ip0->ttl = host_config_ttl;
+	  ip1->ttl = host_config_ttl;
+
+	  /* New fragment id. */
+	  sum0 = ip_csum_update (sum0, ip0->fragment_id, fid[0],
+				 ip4_header_t, fragment_id);
+	  sum1 = ip_csum_update (sum1, ip1->fragment_id, fid[1],
+				 ip4_header_t, fragment_id);
+	  ip0->fragment_id = fid[0];
+	  ip1->fragment_id = fid[1];
+	  fid += 2;
+
+	  ip0->checksum = ip_csum_fold (sum0);
+	  ip1->checksum = ip_csum_fold (sum1);
+
+	  ASSERT (ip0->checksum == ip4_header_checksum (ip0));
+	  ASSERT (ip1->checksum == ip4_header_checksum (ip1));
+
+	  p0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+	  p1->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *p0;
+	  ip4_header_t *ip0;
+	  icmp46_header_t *icmp0;
+	  u32 bi0, src0, dst0;
+	  ip_csum_t sum0;
+
+	  bi0 = to_next[0] = from[0];
+
+	  from += 1;
+	  n_left_from -= 1;
+	  to_next += 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, bi0);
+	  ip0 = vlib_buffer_get_current (p0);
+	  icmp0 = ip4_next_header (ip0);
+
+	  vnet_buffer (p0)->sw_if_index[VLIB_RX] =
+	    vnet_main.local_interface_sw_if_index;
+
+	  /* Update ICMP checksum. */
+	  sum0 = icmp0->checksum;
+
+	  ASSERT (icmp0->type == ICMP4_echo_request);
+	  sum0 = ip_csum_update (sum0, ICMP4_echo_request, ICMP4_echo_reply,
+				 icmp46_header_t, type);
+	  icmp0->type = ICMP4_echo_reply;
+	  icmp0->checksum = ip_csum_fold (sum0);
+
+	  src0 = ip0->src_address.data_u32;
+	  dst0 = ip0->dst_address.data_u32;
+	  ip0->src_address.data_u32 = dst0;
+	  ip0->dst_address.data_u32 = src0;
+
+	  /* Update IP checksum. */
+	  sum0 = ip0->checksum;
+
+	  sum0 = ip_csum_update (sum0, ip0->ttl, host_config_ttl,
+				 ip4_header_t, ttl);
+	  ip0->ttl = host_config_ttl;
+
+	  sum0 = ip_csum_update (sum0, ip0->fragment_id, fid[0],
+				 ip4_header_t, fragment_id);
+	  ip0->fragment_id = fid[0];
+	  fid += 1;
+
+	  ip0->checksum = ip_csum_fold (sum0);
+
+	  ASSERT (ip0->checksum == ip4_header_checksum (ip0));
+
+	  p0->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+	}
+
+      vlib_put_next_frame (vm, node, next, n_left_to_next);
+    }
+
+  vlib_error_count (vm, ip4_icmp_input_node.index,
+		    ICMP4_ERROR_ECHO_REPLIES_SENT, frame->n_vectors);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_icmp_echo_request_node,static) = {
+  .function = ip4_icmp_echo_request,
+  .name = "ip4-icmp-echo-request",
+
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_icmp_input_trace,
+
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "ip4-load-balance",
+  },
+};
+/* *INDENT-ON* */
+
+typedef enum
+{
+  IP4_ICMP_ERROR_NEXT_DROP,
+  IP4_ICMP_ERROR_NEXT_LOOKUP,
+  IP4_ICMP_ERROR_N_NEXT,
+} ip4_icmp_error_next_t;
+
+void
+icmp4_error_set_vnet_buffer (vlib_buffer_t * b, u8 type, u8 code, u32 data)
+{
+  vnet_buffer (b)->ip.icmp.type = type;
+  vnet_buffer (b)->ip.icmp.code = code;
+  vnet_buffer (b)->ip.icmp.data = data;
+}
+
+static u8
+icmp4_icmp_type_to_error (u8 type)
+{
+  switch (type)
+    {
+    case ICMP4_destination_unreachable:
+      return ICMP4_ERROR_DEST_UNREACH_SENT;
+    case ICMP4_time_exceeded:
+      return ICMP4_ERROR_TTL_EXPIRE_SENT;
+    case ICMP4_parameter_problem:
+      return ICMP4_ERROR_PARAM_PROBLEM_SENT;
+    default:
+      return ICMP4_ERROR_DROP;
+    }
+}
+
+static uword
+ip4_icmp_error (vlib_main_t * vm,
+		vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 *from, *to_next;
+  uword n_left_from, n_left_to_next;
+  ip4_icmp_error_next_t next_index;
+  ip4_main_t *im = &ip4_main;
+  ip_lookup_main_t *lm = &im->lookup_main;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  if (node->flags & VLIB_NODE_FLAG_TRACE)
+    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+				   /* stride */ 1,
+				   sizeof (icmp_input_trace_t));
+
+  while (n_left_from > 0)
+    {
+      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 pi0 = from[0];
+	  u32 next0 = IP4_ICMP_ERROR_NEXT_LOOKUP;
+	  u8 error0 = ICMP4_ERROR_NONE;
+	  vlib_buffer_t *p0;
+	  ip4_header_t *ip0, *out_ip0;
+	  icmp46_header_t *icmp0;
+	  u32 sw_if_index0, if_add_index0;
+	  ip_csum_t sum;
+
+	  /* Speculatively enqueue p0 to the current next frame */
+	  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);
+	  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
+
+	  /*
+	   * RFC1812 says to keep as much of the original packet as
+	   * possible within the minimum MTU (576). We cheat "a little"
+	   * here by keeping whatever fits in the first buffer, to be more
+	   * efficient
+	   */
+	  if (PREDICT_FALSE (p0->total_length_not_including_first_buffer))
+	    {
+	      /* clear current_length of all other buffers in chain */
+	      vlib_buffer_t *b = p0;
+	      p0->total_length_not_including_first_buffer = 0;
+	      while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
+		{
+		  b = vlib_get_buffer (vm, b->next_buffer);
+		  b->current_length = 0;
+		}
+	    }
+	  p0->current_length =
+	    p0->current_length > 576 ? 576 : p0->current_length;
+
+	  /* Add IP header and ICMPv4 header including a 4 byte data field */
+	  vlib_buffer_advance (p0,
+			       -sizeof (ip4_header_t) -
+			       sizeof (icmp46_header_t) - 4);
+	  out_ip0 = vlib_buffer_get_current (p0);
+	  icmp0 = (icmp46_header_t *) & out_ip0[1];
+
+	  /* Fill ip header fields */
+	  out_ip0->ip_version_and_header_length = 0x45;
+	  out_ip0->tos = 0;
+	  out_ip0->length = clib_host_to_net_u16 (p0->current_length);
+	  out_ip0->fragment_id = 0;
+	  out_ip0->flags_and_fragment_offset = 0;
+	  out_ip0->ttl = 0xff;
+	  out_ip0->protocol = IP_PROTOCOL_ICMP;
+	  out_ip0->dst_address = ip0->src_address;
+	  if_add_index0 = ~0;
+	  if (PREDICT_TRUE (vec_len (lm->if_address_pool_index_by_sw_if_index)
+			    > sw_if_index0))
+	    if_add_index0 =
+	      lm->if_address_pool_index_by_sw_if_index[sw_if_index0];
+	  if (PREDICT_TRUE (if_add_index0 != ~0))
+	    {
+	      ip_interface_address_t *if_add =
+		pool_elt_at_index (lm->if_address_pool, if_add_index0);
+	      ip4_address_t *if_ip =
+		ip_interface_address_get_address (lm, if_add);
+	      out_ip0->src_address = *if_ip;
+	    }
+	  else
+	    {
+	      /* interface has no IP4 address - should not happen */
+	      next0 = IP4_ICMP_ERROR_NEXT_DROP;
+	      error0 = ICMP4_ERROR_DROP;
+	    }
+	  out_ip0->checksum = ip4_header_checksum (out_ip0);
+
+	  /* Fill icmp header fields */
+	  icmp0->type = vnet_buffer (p0)->ip.icmp.type;
+	  icmp0->code = vnet_buffer (p0)->ip.icmp.code;
+	  *((u32 *) (icmp0 + 1)) =
+	    clib_host_to_net_u32 (vnet_buffer (p0)->ip.icmp.data);
+	  icmp0->checksum = 0;
+	  sum =
+	    ip_incremental_checksum (0, icmp0,
+				     p0->current_length -
+				     sizeof (ip4_header_t));
+	  icmp0->checksum = ~ip_csum_fold (sum);
+
+	  /* Update error status */
+	  if (error0 == ICMP4_ERROR_NONE)
+	    error0 = icmp4_icmp_type_to_error (icmp0->type);
+	  vlib_error_count (vm, node->node_index, error0, 1);
+
+	  /* Verify speculative enqueue, maybe switch current next frame */
+	  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* */
+VLIB_REGISTER_NODE (ip4_icmp_error_node) = {
+  .function = ip4_icmp_error,
+  .name = "ip4-icmp-error",
+  .vector_size = sizeof (u32),
+
+  .n_errors = ARRAY_LEN (icmp_error_strings),
+  .error_strings = icmp_error_strings,
+
+  .n_next_nodes = IP4_ICMP_ERROR_N_NEXT,
+  .next_nodes = {
+    [IP4_ICMP_ERROR_NEXT_DROP] = "error-drop",
+    [IP4_ICMP_ERROR_NEXT_LOOKUP] = "ip4-lookup",
+  },
+
+  .format_trace = format_icmp_input_trace,
+};
+/* *INDENT-ON* */
+
+
+static uword
+unformat_icmp_type_and_code (unformat_input_t * input, va_list * args)
+{
+  icmp46_header_t *h = va_arg (*args, icmp46_header_t *);
+  icmp4_main_t *cm = &icmp4_main;
+  u32 i;
+
+  if (unformat_user (input, unformat_vlib_number_by_name,
+		     cm->type_and_code_by_name, &i))
+    {
+      h->type = (i >> 8) & 0xff;
+      h->code = (i >> 0) & 0xff;
+    }
+  else if (unformat_user (input, unformat_vlib_number_by_name,
+			  cm->type_by_name, &i))
+    {
+      h->type = i;
+      h->code = 0;
+    }
+  else
+    return 0;
+
+  return 1;
+}
+
+static void
+icmp4_pg_edit_function (pg_main_t * pg,
+			pg_stream_t * s,
+			pg_edit_group_t * g, u32 * packets, u32 n_packets)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  u32 ip_offset, icmp_offset;
+
+  icmp_offset = g->start_byte_offset;
+  ip_offset = (g - 1)->start_byte_offset;
+
+  while (n_packets >= 1)
+    {
+      vlib_buffer_t *p0;
+      ip4_header_t *ip0;
+      icmp46_header_t *icmp0;
+      u32 len0;
+
+      p0 = vlib_get_buffer (vm, packets[0]);
+      n_packets -= 1;
+      packets += 1;
+
+      ASSERT (p0->current_data == 0);
+      ip0 = (void *) (p0->data + ip_offset);
+      icmp0 = (void *) (p0->data + icmp_offset);
+      len0 = clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
+      icmp0->checksum =
+	~ip_csum_fold (ip_incremental_checksum (0, icmp0, len0));
+    }
+}
+
+typedef struct
+{
+  pg_edit_t type, code;
+  pg_edit_t checksum;
+} pg_icmp46_header_t;
+
+always_inline void
+pg_icmp_header_init (pg_icmp46_header_t * p)
+{
+  /* Initialize fields that are not bit fields in the IP header. */
+#define _(f) pg_edit_init (&p->f, icmp46_header_t, f);
+  _(type);
+  _(code);
+  _(checksum);
+#undef _
+}
+
+static uword
+unformat_pg_icmp_header (unformat_input_t * input, va_list * args)
+{
+  pg_stream_t *s = va_arg (*args, pg_stream_t *);
+  pg_icmp46_header_t *p;
+  u32 group_index;
+
+  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (icmp46_header_t),
+			    &group_index);
+  pg_icmp_header_init (p);
+
+  p->checksum.type = PG_EDIT_UNSPECIFIED;
+
+  {
+    icmp46_header_t tmp;
+
+    if (!unformat (input, "ICMP %U", unformat_icmp_type_and_code, &tmp))
+      goto error;
+
+    pg_edit_set_fixed (&p->type, tmp.type);
+    pg_edit_set_fixed (&p->code, tmp.code);
+  }
+
+  /* Parse options. */
+  while (1)
+    {
+      if (unformat (input, "checksum %U",
+		    unformat_pg_edit, unformat_pg_number, &p->checksum))
+	;
+
+      /* Can't parse input: try next protocol level. */
+      else
+	break;
+    }
+
+  if (!unformat_user (input, unformat_pg_payload, s))
+    goto error;
+
+  if (p->checksum.type == PG_EDIT_UNSPECIFIED)
+    {
+      pg_edit_group_t *g = pg_stream_get_group (s, group_index);
+      g->edit_function = icmp4_pg_edit_function;
+      g->edit_function_opaque = 0;
+    }
+
+  return 1;
+
+error:
+  /* Free up any edits we may have added. */
+  pg_free_edit_group (s);
+  return 0;
+}
+
+void
+ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type, u32 node_index)
+{
+  icmp4_main_t *im = &icmp4_main;
+
+  ASSERT ((int) type < ARRAY_LEN (im->ip4_input_next_index_by_type));
+  im->ip4_input_next_index_by_type[type]
+    = vlib_node_add_next (vm, ip4_icmp_input_node.index, node_index);
+}
+
+static clib_error_t *
+icmp4_init (vlib_main_t * vm)
+{
+  ip_main_t *im = &ip_main;
+  ip_protocol_info_t *pi;
+  icmp4_main_t *cm = &icmp4_main;
+  clib_error_t *error;
+
+  error = vlib_call_init_function (vm, ip_main_init);
+
+  if (error)
+    return error;
+
+  pi = ip_get_protocol_info (im, IP_PROTOCOL_ICMP);
+  pi->format_header = format_ip4_icmp_header;
+  pi->unformat_pg_edit = unformat_pg_icmp_header;
+
+  cm->type_by_name = hash_create_string (0, sizeof (uword));
+#define _(n,t) hash_set_mem (cm->type_by_name, #t, (n));
+  foreach_icmp4_type;
+#undef _
+
+  cm->type_and_code_by_name = hash_create_string (0, sizeof (uword));
+#define _(a,n,t) hash_set_mem (cm->type_by_name, #t, (n) | (ICMP4_##a << 8));
+  foreach_icmp4_code;
+#undef _
+
+  memset (cm->ip4_input_next_index_by_type,
+	  ICMP_INPUT_NEXT_ERROR, sizeof (cm->ip4_input_next_index_by_type));
+
+  ip4_icmp_register_type (vm, ICMP4_echo_request,
+			  ip4_icmp_echo_request_node.index);
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (icmp4_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */