2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/icmp4.c: ipv4 icmp
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vlib/vlib.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/pg/pg.h>
43 #include <vnet/ip/ip_sas.h>
45 static char *icmp_error_strings[] = {
52 format_ip4_icmp_type_and_code (u8 * s, va_list * args)
54 icmp4_type_t type = va_arg (*args, int);
55 u8 code = va_arg (*args, int);
58 #define _(n,f) case n: t = #f; break;
71 return format (s, "unknown 0x%x", type);
73 s = format (s, "%s", t);
76 switch ((type << 8) | code)
78 #define _(a,n,f) case (ICMP4_##a << 8) | (n): t = #f; break;
86 s = format (s, " %s", t);
92 format_ip4_icmp_header (u8 * s, va_list * args)
94 icmp46_header_t *icmp = va_arg (*args, icmp46_header_t *);
95 u32 max_header_bytes = va_arg (*args, u32);
98 if (max_header_bytes < sizeof (icmp[0]))
99 return format (s, "ICMP header truncated");
101 s = format (s, "ICMP %U checksum 0x%x",
102 format_ip4_icmp_type_and_code, icmp->type, icmp->code,
103 clib_net_to_host_u16 (icmp->checksum));
105 if ((ICMP4_echo_request == icmp->type || ICMP4_echo_reply == icmp->type)
106 && sizeof (icmp[0]) + sizeof (u16) < max_header_bytes)
108 s = format (s, " id %u", clib_net_to_host_u16 (*(u16 *) (icmp + 1)));
115 format_icmp_input_trace (u8 * s, va_list * va)
117 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
118 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
119 icmp_input_trace_t *t = va_arg (*va, icmp_input_trace_t *);
122 format_ip4_header, t->packet_data, sizeof (t->packet_data));
129 ICMP_INPUT_NEXT_ERROR,
135 uword *type_and_code_by_name;
139 /* Vector dispatch table indexed by [icmp type]. */
140 u8 ip4_input_next_index_by_type[256];
143 icmp4_main_t icmp4_main;
146 ip4_icmp_input (vlib_main_t * vm,
147 vlib_node_runtime_t * node, vlib_frame_t * frame)
149 icmp4_main_t *im = &icmp4_main;
150 uword n_packets = frame->n_vectors;
152 u32 n_left_from, n_left_to_next, next;
154 from = vlib_frame_vector_args (frame);
155 n_left_from = n_packets;
156 next = node->cached_next_index;
158 if (node->flags & VLIB_NODE_FLAG_TRACE)
159 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
161 sizeof (icmp_input_trace_t));
163 while (n_left_from > 0)
165 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
167 while (n_left_from > 0 && n_left_to_next > 0)
171 icmp46_header_t *icmp0;
175 if (PREDICT_TRUE (n_left_from > 2))
177 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
178 p0 = vlib_get_buffer (vm, from[1]);
179 ip0 = vlib_buffer_get_current (p0);
180 clib_prefetch_load (ip0);
183 bi0 = to_next[0] = from[0];
190 p0 = vlib_get_buffer (vm, bi0);
191 ip0 = vlib_buffer_get_current (p0);
192 icmp0 = ip4_next_header (ip0);
194 next0 = im->ip4_input_next_index_by_type[type0];
196 p0->error = node->errors[ICMP4_ERROR_UNKNOWN_TYPE];
198 /* Verify speculative enqueue, maybe switch current next frame */
199 vlib_validate_buffer_enqueue_x1 (vm, node, next, to_next,
200 n_left_to_next, bi0, next0);
203 vlib_put_next_frame (vm, node, next, n_left_to_next);
206 return frame->n_vectors;
210 VLIB_REGISTER_NODE (ip4_icmp_input_node) = {
211 .function = ip4_icmp_input,
212 .name = "ip4-icmp-input",
214 .vector_size = sizeof (u32),
216 .format_trace = format_icmp_input_trace,
218 .n_errors = ARRAY_LEN (icmp_error_strings),
219 .error_strings = icmp_error_strings,
223 [ICMP_INPUT_NEXT_ERROR] = "ip4-punt",
230 IP4_ICMP_ERROR_NEXT_DROP,
231 IP4_ICMP_ERROR_NEXT_LOOKUP,
232 IP4_ICMP_ERROR_N_NEXT,
233 } ip4_icmp_error_next_t;
236 icmp4_icmp_type_to_error (u8 type)
240 case ICMP4_destination_unreachable:
241 return ICMP4_ERROR_DEST_UNREACH_SENT;
242 case ICMP4_time_exceeded:
243 return ICMP4_ERROR_TTL_EXPIRE_SENT;
244 case ICMP4_parameter_problem:
245 return ICMP4_ERROR_PARAM_PROBLEM_SENT;
247 return ICMP4_ERROR_DROP;
252 ip4_icmp_error (vlib_main_t * vm,
253 vlib_node_runtime_t * node, vlib_frame_t * frame)
256 uword n_left_from, n_left_to_next;
257 ip4_icmp_error_next_t next_index;
259 from = vlib_frame_vector_args (frame);
260 n_left_from = frame->n_vectors;
261 next_index = node->cached_next_index;
263 if (node->flags & VLIB_NODE_FLAG_TRACE)
264 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
266 sizeof (icmp_input_trace_t));
268 while (n_left_from > 0)
270 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
272 while (n_left_from > 0 && n_left_to_next > 0)
275 * Duplicate first buffer and free the original chain. Keep
276 * as much of the original packet as possible, within the
277 * minimum MTU. We chat "a little" here by keeping whatever
278 * is available in the first buffer.
282 u32 org_pi0 = from[0];
283 u32 next0 = IP4_ICMP_ERROR_NEXT_LOOKUP;
284 u8 error0 = ICMP4_ERROR_NONE;
285 vlib_buffer_t *p0, *org_p0;
286 ip4_header_t *ip0, *out_ip0;
287 icmp46_header_t *icmp0;
291 org_p0 = vlib_get_buffer (vm, org_pi0);
292 p0 = vlib_buffer_copy_no_chain (vm, org_p0, &pi0);
293 if (!p0 || pi0 == ~0) /* Out of buffers */
296 /* Speculatively enqueue p0 to the current next frame */
303 ip0 = vlib_buffer_get_current (p0);
304 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
306 /* Add IP header and ICMPv4 header including a 4 byte data field */
307 vlib_buffer_advance (p0,
308 -sizeof (ip4_header_t) -
309 sizeof (icmp46_header_t) - 4);
312 p0->current_length > 576 ? 576 : p0->current_length;
313 out_ip0 = vlib_buffer_get_current (p0);
314 icmp0 = (icmp46_header_t *) & out_ip0[1];
316 /* Fill ip header fields */
317 out_ip0->ip_version_and_header_length = 0x45;
319 out_ip0->length = clib_host_to_net_u16 (p0->current_length);
320 out_ip0->fragment_id = 0;
321 out_ip0->flags_and_fragment_offset = 0;
323 out_ip0->protocol = IP_PROTOCOL_ICMP;
324 out_ip0->dst_address = ip0->src_address;
325 /* Prefer a source address from "offending interface" */
326 if (!ip4_sas_by_sw_if_index (sw_if_index0, &out_ip0->dst_address,
327 &out_ip0->src_address))
328 { /* interface has no IP6 address - should not happen */
329 next0 = IP4_ICMP_ERROR_NEXT_DROP;
330 error0 = ICMP4_ERROR_DROP;
333 out_ip0->checksum = ip4_header_checksum (out_ip0);
335 /* Fill icmp header fields */
336 icmp0->type = vnet_buffer (p0)->ip.icmp.type;
337 icmp0->code = vnet_buffer (p0)->ip.icmp.code;
338 *((u32 *) (icmp0 + 1)) =
339 clib_host_to_net_u32 (vnet_buffer (p0)->ip.icmp.data);
342 ip_incremental_checksum (0, icmp0,
344 sizeof (ip4_header_t));
345 icmp0->checksum = ~ip_csum_fold (sum);
347 /* Update error status */
348 if (error0 == ICMP4_ERROR_NONE)
349 error0 = icmp4_icmp_type_to_error (icmp0->type);
351 vlib_error_count (vm, node->node_index, error0, 1);
353 /* Verify speculative enqueue, maybe switch current next frame */
354 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
355 to_next, n_left_to_next,
358 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
362 * push the original buffers to error-drop, so that
363 * they can get the error counters handled, then freed
365 vlib_buffer_enqueue_to_single_next (vm, node,
366 vlib_frame_vector_args (frame),
367 IP4_ICMP_ERROR_NEXT_DROP,
370 return frame->n_vectors;
374 VLIB_REGISTER_NODE (ip4_icmp_error_node) = {
375 .function = ip4_icmp_error,
376 .name = "ip4-icmp-error",
377 .vector_size = sizeof (u32),
379 .n_errors = ARRAY_LEN (icmp_error_strings),
380 .error_strings = icmp_error_strings,
382 .n_next_nodes = IP4_ICMP_ERROR_N_NEXT,
384 [IP4_ICMP_ERROR_NEXT_DROP] = "ip4-drop",
385 [IP4_ICMP_ERROR_NEXT_LOOKUP] = "ip4-lookup",
388 .format_trace = format_icmp_input_trace,
394 unformat_icmp_type_and_code (unformat_input_t * input, va_list * args)
396 icmp46_header_t *h = va_arg (*args, icmp46_header_t *);
397 icmp4_main_t *cm = &icmp4_main;
400 if (unformat_user (input, unformat_vlib_number_by_name,
401 cm->type_and_code_by_name, &i))
403 h->type = (i >> 8) & 0xff;
404 h->code = (i >> 0) & 0xff;
406 else if (unformat_user (input, unformat_vlib_number_by_name,
407 cm->type_by_name, &i))
419 icmp4_pg_edit_function (pg_main_t * pg,
421 pg_edit_group_t * g, u32 * packets, u32 n_packets)
423 vlib_main_t *vm = vlib_get_main ();
424 u32 ip_offset, icmp_offset;
426 icmp_offset = g->start_byte_offset;
427 ip_offset = (g - 1)->start_byte_offset;
429 while (n_packets >= 1)
433 icmp46_header_t *icmp0;
436 p0 = vlib_get_buffer (vm, packets[0]);
440 ASSERT (p0->current_data == 0);
441 ip0 = (void *) (p0->data + ip_offset);
442 icmp0 = (void *) (p0->data + icmp_offset);
444 /* if IP length has been specified, then calculate the length based on buffer */
445 if (ip0->length == 0)
446 len0 = vlib_buffer_length_in_chain (vm, p0) - icmp_offset;
448 len0 = clib_net_to_host_u16 (ip0->length) - icmp_offset;
451 ~ip_csum_fold (ip_incremental_checksum (0, icmp0, len0));
457 pg_edit_t type, code;
459 } pg_icmp46_header_t;
462 pg_icmp_header_init (pg_icmp46_header_t * p)
464 /* Initialize fields that are not bit fields in the IP header. */
465 #define _(f) pg_edit_init (&p->f, icmp46_header_t, f);
473 unformat_pg_icmp_header (unformat_input_t * input, va_list * args)
475 pg_stream_t *s = va_arg (*args, pg_stream_t *);
476 pg_icmp46_header_t *p;
479 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (icmp46_header_t),
481 pg_icmp_header_init (p);
483 p->checksum.type = PG_EDIT_UNSPECIFIED;
488 if (!unformat (input, "ICMP %U", unformat_icmp_type_and_code, &tmp))
491 pg_edit_set_fixed (&p->type, tmp.type);
492 pg_edit_set_fixed (&p->code, tmp.code);
498 if (unformat (input, "checksum %U",
499 unformat_pg_edit, unformat_pg_number, &p->checksum))
502 /* Can't parse input: try next protocol level. */
507 if (!unformat_user (input, unformat_pg_payload, s))
510 if (p->checksum.type == PG_EDIT_UNSPECIFIED)
512 pg_edit_group_t *g = pg_stream_get_group (s, group_index);
513 g->edit_function = icmp4_pg_edit_function;
514 g->edit_function_opaque = 0;
520 /* Free up any edits we may have added. */
521 pg_free_edit_group (s);
526 ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type, u32 node_index)
528 icmp4_main_t *im = &icmp4_main;
531 ASSERT ((int) type < ARRAY_LEN (im->ip4_input_next_index_by_type));
532 old_next_index = im->ip4_input_next_index_by_type[type];
534 im->ip4_input_next_index_by_type[type]
535 = vlib_node_add_next (vm, ip4_icmp_input_node.index, node_index);
537 if (old_next_index &&
538 (old_next_index != im->ip4_input_next_index_by_type[type]))
539 clib_warning ("WARNING: changed next_by_type[%d]", (int) type);
542 static clib_error_t *
543 icmp4_init (vlib_main_t * vm)
545 ip_main_t *im = &ip_main;
546 ip_protocol_info_t *pi;
547 icmp4_main_t *cm = &icmp4_main;
550 error = vlib_call_init_function (vm, ip_main_init);
555 pi = ip_get_protocol_info (im, IP_PROTOCOL_ICMP);
556 pi->format_header = format_ip4_icmp_header;
557 pi->unformat_pg_edit = unformat_pg_icmp_header;
559 cm->type_by_name = hash_create_string (0, sizeof (uword));
560 #define _(n,t) hash_set_mem (cm->type_by_name, #t, (n));
564 cm->type_and_code_by_name = hash_create_string (0, sizeof (uword));
565 #define _(a,n,t) hash_set_mem (cm->type_by_name, #t, (n) | (ICMP4_##a << 8));
569 clib_memset (cm->ip4_input_next_index_by_type,
570 ICMP_INPUT_NEXT_ERROR,
571 sizeof (cm->ip4_input_next_index_by_type));
576 VLIB_INIT_FUNCTION (icmp4_init);
579 * fd.io coding-style-patch-verification: ON
582 * eval: (c-set-style "gnu")