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-rw-r--r--src/vnet/ip/icmp4.c784
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:
+ */