FD.io VPP  v19.01.1-17-ge106252
Vector Packet Processing
icmp6.c
Go to the documentation of this file.
1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 /*
16  * ip/icmp6.c: ip6 icmp
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
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:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
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.
38  */
39 
40 #include <vlib/vlib.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/pg/pg.h>
43 
44 static u8 *
45 format_ip6_icmp_type_and_code (u8 * s, va_list * args)
46 {
47  icmp6_type_t type = va_arg (*args, int);
48  u8 code = va_arg (*args, int);
49  char *t = 0;
50 
51 #define _(n,f) case n: t = #f; break;
52 
53  switch (type)
54  {
56 
57  default:
58  break;
59  }
60 
61 #undef _
62 
63  if (!t)
64  return format (s, "unknown 0x%x", type);
65 
66  s = format (s, "%s", t);
67 
68  t = 0;
69  switch ((type << 8) | code)
70  {
71 #define _(a,n,f) case (ICMP6_##a << 8) | (n): t = #f; break;
72 
74 
75 #undef _
76  }
77 
78  if (t)
79  s = format (s, " %s", t);
80 
81  return s;
82 }
83 
84 static u8 *
85 format_icmp6_header (u8 * s, va_list * args)
86 {
87  icmp46_header_t *icmp = va_arg (*args, icmp46_header_t *);
88  u32 max_header_bytes = va_arg (*args, u32);
89 
90  /* Nothing to do. */
91  if (max_header_bytes < sizeof (icmp[0]))
92  return format (s, "ICMP header truncated");
93 
94  s = format (s, "ICMP %U checksum 0x%x",
95  format_ip6_icmp_type_and_code, icmp->type, icmp->code,
96  clib_net_to_host_u16 (icmp->checksum));
97 
98  if (max_header_bytes >=
99  sizeof (icmp6_neighbor_solicitation_or_advertisement_header_t) &&
100  (icmp->type == ICMP6_neighbor_solicitation ||
101  icmp->type == ICMP6_neighbor_advertisement))
102  {
103  icmp6_neighbor_solicitation_or_advertisement_header_t *icmp6_nd =
104  (icmp6_neighbor_solicitation_or_advertisement_header_t *) icmp;
105  s = format (s, "\n target address %U",
106  format_ip6_address, &icmp6_nd->target_address);
107  }
108 
109  return s;
110 }
111 
112 u8 *
113 format_icmp6_input_trace (u8 * s, va_list * va)
114 {
115  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
116  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
117  icmp6_input_trace_t *t = va_arg (*va, icmp6_input_trace_t *);
118 
119  s = format (s, "%U",
120  format_ip6_header, t->packet_data, sizeof (t->packet_data));
121 
122  return s;
123 }
124 
125 static char *icmp_error_strings[] = {
126 #define _(f,s) s,
128 #undef _
129 };
130 
131 typedef enum
132 {
136 
137 typedef struct
138 {
140 
142 
143  /* Vector dispatch table indexed by [icmp type]. */
144  u8 input_next_index_by_type[256];
145 
146  /* Max valid code indexed by icmp type. */
147  u8 max_valid_code_by_type[256];
148 
149  /* hop_limit must be >= this value for this icmp type. */
150  u8 min_valid_hop_limit_by_type[256];
151 
152  u8 min_valid_length_by_type[256];
153 } icmp6_main_t;
154 
156 
157 static uword
159  vlib_node_runtime_t * node, vlib_frame_t * frame)
160 {
161  icmp6_main_t *im = &icmp6_main;
162  u32 *from, *to_next;
163  u32 n_left_from, n_left_to_next, next_index;
164 
165  from = vlib_frame_vector_args (frame);
166  n_left_from = frame->n_vectors;
167  next_index = node->cached_next_index;
168 
169  if (node->flags & VLIB_NODE_FLAG_TRACE)
170  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
171  /* stride */ 1,
172  sizeof (icmp6_input_trace_t));
173 
174  while (n_left_from > 0)
175  {
176  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
177 
178  while (n_left_from > 0 && n_left_to_next > 0)
179  {
180  vlib_buffer_t *b0;
181  ip6_header_t *ip0;
182  icmp46_header_t *icmp0;
183  icmp6_type_t type0;
184  u32 bi0, next0, error0, len0;
185 
186  bi0 = to_next[0] = from[0];
187 
188  from += 1;
189  n_left_from -= 1;
190  to_next += 1;
191  n_left_to_next -= 1;
192 
193  b0 = vlib_get_buffer (vm, bi0);
194  ip0 = vlib_buffer_get_current (b0);
195  icmp0 = ip6_next_header (ip0);
196  type0 = icmp0->type;
197 
198  error0 = ICMP6_ERROR_NONE;
199 
200  next0 = im->input_next_index_by_type[type0];
201  error0 =
202  next0 == ICMP_INPUT_NEXT_DROP ? ICMP6_ERROR_UNKNOWN_TYPE : error0;
203 
204  /* Check code is valid for type. */
205  error0 =
206  icmp0->code >
207  im->max_valid_code_by_type[type0] ?
208  ICMP6_ERROR_INVALID_CODE_FOR_TYPE : error0;
209 
210  /* Checksum is already validated by ip6_local node so we don't need to check that. */
211 
212  /* Check that hop limit == 255 for certain types. */
213  error0 =
214  ip0->hop_limit <
215  im->min_valid_hop_limit_by_type[type0] ?
216  ICMP6_ERROR_INVALID_HOP_LIMIT_FOR_TYPE : error0;
217 
218  len0 = clib_net_to_host_u16 (ip0->payload_length);
219  error0 =
220  len0 <
221  im->min_valid_length_by_type[type0] ?
222  ICMP6_ERROR_LENGTH_TOO_SMALL_FOR_TYPE : error0;
223 
224  b0->error = node->errors[error0];
225 
226  next0 = error0 != ICMP6_ERROR_NONE ? ICMP_INPUT_NEXT_DROP : next0;
227 
228  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
229  to_next, n_left_to_next,
230  bi0, next0);
231  }
232 
233  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
234  }
235 
236  return frame->n_vectors;
237 }
238 
239 /* *INDENT-OFF* */
241  .function = ip6_icmp_input,
242  .name = "ip6-icmp-input",
243 
244  .vector_size = sizeof (u32),
245 
246  .format_trace = format_icmp6_input_trace,
247 
248  .n_errors = ARRAY_LEN (icmp_error_strings),
249  .error_strings = icmp_error_strings,
250 
251  .n_next_nodes = 1,
252  .next_nodes = {
253  [ICMP_INPUT_NEXT_DROP] = "ip6-drop",
254  },
255 };
256 /* *INDENT-ON* */
257 
258 typedef enum
259 {
264 
265 static uword
267  vlib_node_runtime_t * node, vlib_frame_t * frame)
268 {
269  u32 *from, *to_next;
270  u32 n_left_from, n_left_to_next, next_index;
271  ip6_main_t *im = &ip6_main;
272 
273  from = vlib_frame_vector_args (frame);
274  n_left_from = frame->n_vectors;
275  next_index = node->cached_next_index;
276 
277  if (node->flags & VLIB_NODE_FLAG_TRACE)
278  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
279  /* stride */ 1,
280  sizeof (icmp6_input_trace_t));
281 
282  while (n_left_from > 0)
283  {
284  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
285 
286  while (n_left_from > 2 && n_left_to_next > 2)
287  {
288  vlib_buffer_t *p0, *p1;
289  ip6_header_t *ip0, *ip1;
290  icmp46_header_t *icmp0, *icmp1;
291  ip6_address_t tmp0, tmp1;
292  ip_csum_t sum0, sum1;
293  u32 bi0, bi1;
294  u32 fib_index0, fib_index1;
297 
298  bi0 = to_next[0] = from[0];
299  bi1 = to_next[1] = from[1];
300 
301  from += 2;
302  n_left_from -= 2;
303  to_next += 2;
304  n_left_to_next -= 2;
305 
306  p0 = vlib_get_buffer (vm, bi0);
307  p1 = vlib_get_buffer (vm, bi1);
308  ip0 = vlib_buffer_get_current (p0);
309  ip1 = vlib_buffer_get_current (p1);
310  icmp0 = ip6_next_header (ip0);
311  icmp1 = ip6_next_header (ip1);
312 
313  /* Check icmp type to echo reply and update icmp checksum. */
314  sum0 = icmp0->checksum;
315  sum1 = icmp1->checksum;
316 
317  ASSERT (icmp0->type == ICMP6_echo_request);
318  ASSERT (icmp1->type == ICMP6_echo_request);
319  sum0 = ip_csum_update (sum0, ICMP6_echo_request, ICMP6_echo_reply,
320  icmp46_header_t, type);
321  sum1 = ip_csum_update (sum1, ICMP6_echo_request, ICMP6_echo_reply,
322  icmp46_header_t, type);
323 
324  icmp0->checksum = ip_csum_fold (sum0);
325  icmp1->checksum = ip_csum_fold (sum1);
326 
327  icmp0->type = ICMP6_echo_reply;
328  icmp1->type = ICMP6_echo_reply;
329 
330  /* Swap source and destination address. */
331  tmp0 = ip0->src_address;
332  tmp1 = ip1->src_address;
333 
334  ip0->src_address = ip0->dst_address;
335  ip1->src_address = ip1->dst_address;
336 
337  ip0->dst_address = tmp0;
338  ip1->dst_address = tmp1;
339 
340  /* New hop count. */
341  ip0->hop_limit = im->host_config.ttl;
342  ip1->hop_limit = im->host_config.ttl;
343 
344  /* Determine the correct lookup fib indices... */
345  fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
347  vnet_buffer (p0)->sw_if_index[VLIB_TX] = fib_index0;
348  /* Determine the correct lookup fib indices... */
349  fib_index1 = vec_elt (im->fib_index_by_sw_if_index,
350  vnet_buffer (p1)->sw_if_index[VLIB_RX]);
351  vnet_buffer (p1)->sw_if_index[VLIB_TX] = fib_index1;
352 
353  /* verify speculative enqueues, maybe switch current next frame */
354  /* if next0==next1==next_index then nothing special needs to be done */
355  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
356  to_next, n_left_to_next,
357  bi0, bi1, next0, next1);
358  }
359 
360  while (n_left_from > 0 && n_left_to_next > 0)
361  {
362  vlib_buffer_t *p0;
363  ip6_header_t *ip0;
364  icmp46_header_t *icmp0;
365  u32 bi0;
366  ip6_address_t tmp0;
367  ip_csum_t sum0;
368  u32 fib_index0;
370 
371  bi0 = to_next[0] = from[0];
372 
373  from += 1;
374  n_left_from -= 1;
375  to_next += 1;
376  n_left_to_next -= 1;
377 
378  p0 = vlib_get_buffer (vm, bi0);
379  ip0 = vlib_buffer_get_current (p0);
380  icmp0 = ip6_next_header (ip0);
381 
382  /* Check icmp type to echo reply and update icmp checksum. */
383  sum0 = icmp0->checksum;
384 
385  ASSERT (icmp0->type == ICMP6_echo_request);
386  sum0 = ip_csum_update (sum0, ICMP6_echo_request, ICMP6_echo_reply,
387  icmp46_header_t, type);
388 
389  icmp0->checksum = ip_csum_fold (sum0);
390 
391  icmp0->type = ICMP6_echo_reply;
392 
393  /* Swap source and destination address. */
394  tmp0 = ip0->src_address;
395  ip0->src_address = ip0->dst_address;
396  ip0->dst_address = tmp0;
397 
398  ip0->hop_limit = im->host_config.ttl;
399 
400  /* if the packet is link local, we'll bounce through the link-local
401  * table with the RX interface correctly set */
402  fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
404  vnet_buffer (p0)->sw_if_index[VLIB_TX] = fib_index0;
405 
406  /* Verify speculative enqueue, maybe switch current next frame */
407  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
408  to_next, n_left_to_next,
409  bi0, next0);
410  }
411 
412  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
413  }
414 
416  ICMP6_ERROR_ECHO_REPLIES_SENT, frame->n_vectors);
417 
418  return frame->n_vectors;
419 }
420 
421 /* *INDENT-OFF* */
423  .function = ip6_icmp_echo_request,
424  .name = "ip6-icmp-echo-request",
425 
426  .vector_size = sizeof (u32),
427 
428  .format_trace = format_icmp6_input_trace,
429 
430  .n_next_nodes = ICMP6_ECHO_REQUEST_N_NEXT,
431  .next_nodes = {
432  [ICMP6_ECHO_REQUEST_NEXT_LOOKUP] = "ip6-lookup",
433  [ICMP6_ECHO_REQUEST_NEXT_OUTPUT] = "interface-output",
434  },
435 };
436 /* *INDENT-ON* */
437 
438 typedef enum
439 {
444 
445 void
447 {
448  vnet_buffer (b)->ip.icmp.type = type;
449  vnet_buffer (b)->ip.icmp.code = code;
450  vnet_buffer (b)->ip.icmp.data = data;
451 }
452 
453 static u8
455 {
456  switch (type)
457  {
458  case ICMP6_destination_unreachable:
459  return ICMP6_ERROR_DEST_UNREACH_SENT;
460  case ICMP6_packet_too_big:
461  return ICMP6_ERROR_PACKET_TOO_BIG_SENT;
462  case ICMP6_time_exceeded:
463  return ICMP6_ERROR_TTL_EXPIRE_SENT;
464  case ICMP6_parameter_problem:
465  return ICMP6_ERROR_PARAM_PROBLEM_SENT;
466  default:
467  return ICMP6_ERROR_DROP;
468  }
469 }
470 
471 static uword
473  vlib_node_runtime_t * node, vlib_frame_t * frame)
474 {
475  u32 *from, *to_next;
476  uword n_left_from, n_left_to_next;
477  ip6_icmp_error_next_t next_index;
478  ip6_main_t *im = &ip6_main;
479  ip_lookup_main_t *lm = &im->lookup_main;
480 
481  from = vlib_frame_vector_args (frame);
482  n_left_from = frame->n_vectors;
483  next_index = node->cached_next_index;
484 
485  if (node->flags & VLIB_NODE_FLAG_TRACE)
486  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
487  /* stride */ 1,
488  sizeof (icmp6_input_trace_t));
489 
490  while (n_left_from > 0)
491  {
492  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
493 
494  while (n_left_from > 0 && n_left_to_next > 0)
495  {
496  u32 pi0 = from[0];
498  u8 error0 = ICMP6_ERROR_NONE;
499  vlib_buffer_t *p0;
500  ip6_header_t *ip0, *out_ip0;
501  icmp46_header_t *icmp0;
502  u32 sw_if_index0, if_add_index0;
503  int bogus_length;
504 
505  /* Speculatively enqueue p0 to the current next frame */
506  to_next[0] = pi0;
507  from += 1;
508  to_next += 1;
509  n_left_from -= 1;
510  n_left_to_next -= 1;
511 
512  p0 = vlib_get_buffer (vm, pi0);
513  ip0 = vlib_buffer_get_current (p0);
514  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
515 
516  /* RFC4443 says to keep as much of the original packet as possible
517  * within the minimum MTU. We cheat "a little" here by keeping whatever fits
518  * in the first buffer, to be more efficient */
520  { /* clear current_length of all other buffers in chain */
521  vlib_buffer_t *b = p0;
523  while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
524  {
525  b = vlib_get_buffer (vm, b->next_buffer);
526  b->current_length = 0;
527  // XXX: Buffer leak???
528  }
529  }
530 
531  /* Add IP header and ICMPv6 header including a 4 byte data field */
532  int headroom = sizeof (ip6_header_t) + sizeof (icmp46_header_t) + 4;
533 
534  /* Verify that we're not falling off the edge */
535  if (p0->current_data - headroom < -VLIB_BUFFER_PRE_DATA_SIZE)
536  {
537  next0 = IP6_ICMP_ERROR_NEXT_DROP;
538  error0 = ICMP6_ERROR_DROP;
539  goto error;
540  }
541 
542  vlib_buffer_advance (p0, -headroom);
543  vnet_buffer (p0)->sw_if_index[VLIB_TX] = ~0;
544  p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
545  p0->current_length =
546  p0->current_length > 1280 ? 1280 : p0->current_length;
547 
548  out_ip0 = vlib_buffer_get_current (p0);
549  icmp0 = (icmp46_header_t *) & out_ip0[1];
550 
551  /* Fill ip header fields */
553  clib_host_to_net_u32 (0x6 << 28);
554 
555  out_ip0->payload_length =
556  clib_host_to_net_u16 (p0->current_length - sizeof (ip6_header_t));
557  out_ip0->protocol = IP_PROTOCOL_ICMP6;
558  out_ip0->hop_limit = 0xff;
559  out_ip0->dst_address = ip0->src_address;
560  if_add_index0 =
561  lm->if_address_pool_index_by_sw_if_index[sw_if_index0];
562  if (PREDICT_TRUE (if_add_index0 != ~0))
563  {
564  ip_interface_address_t *if_add =
565  pool_elt_at_index (lm->if_address_pool, if_add_index0);
566  ip6_address_t *if_ip =
568  out_ip0->src_address = *if_ip;
569  }
570  else /* interface has no IP6 address - should not happen */
571  {
572  next0 = IP6_ICMP_ERROR_NEXT_DROP;
573  error0 = ICMP6_ERROR_DROP;
574  goto error;
575  }
576 
577  /* Fill icmp header fields */
578  icmp0->type = vnet_buffer (p0)->ip.icmp.type;
579  icmp0->code = vnet_buffer (p0)->ip.icmp.code;
580  *((u32 *) (icmp0 + 1)) =
581  clib_host_to_net_u32 (vnet_buffer (p0)->ip.icmp.data);
582  icmp0->checksum = 0;
583  icmp0->checksum =
584  ip6_tcp_udp_icmp_compute_checksum (vm, p0, out_ip0,
585  &bogus_length);
586 
587  /* Update error status */
588  if (error0 == ICMP6_ERROR_NONE)
589  error0 = icmp6_icmp_type_to_error (icmp0->type);
590 
591  error:
592  vlib_error_count (vm, node->node_index, error0, 1);
593 
594  /* Verify speculative enqueue, maybe switch current next frame */
595  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
596  to_next, n_left_to_next,
597  pi0, next0);
598  }
599  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
600  }
601 
602  return frame->n_vectors;
603 }
604 
605 /* *INDENT-OFF* */
607  .function = ip6_icmp_error,
608  .name = "ip6-icmp-error",
609  .vector_size = sizeof (u32),
610 
611  .n_errors = ARRAY_LEN (icmp_error_strings),
612  .error_strings = icmp_error_strings,
613 
614  .n_next_nodes = IP6_ICMP_ERROR_N_NEXT,
615  .next_nodes = {
616  [IP6_ICMP_ERROR_NEXT_DROP] = "error-drop",
617  [IP6_ICMP_ERROR_NEXT_LOOKUP] = "ip6-lookup",
618  },
619 
620  .format_trace = format_icmp6_input_trace,
621 };
622 /* *INDENT-ON* */
623 
624 
625 static uword
627 {
628  icmp46_header_t *h = va_arg (*args, icmp46_header_t *);
629  icmp6_main_t *cm = &icmp6_main;
630  u32 i;
631 
633  cm->type_and_code_by_name, &i))
634  {
635  h->type = (i >> 8) & 0xff;
636  h->code = (i >> 0) & 0xff;
637  }
639  cm->type_by_name, &i))
640  {
641  h->type = i;
642  h->code = 0;
643  }
644  else
645  return 0;
646 
647  return 1;
648 }
649 
650 static void
652  pg_stream_t * s,
653  pg_edit_group_t * g, u32 * packets, u32 n_packets)
654 {
656  u32 ip_offset, icmp_offset;
657  int bogus_length;
658 
659  icmp_offset = g->start_byte_offset;
660  ip_offset = (g - 1)->start_byte_offset;
661 
662  while (n_packets >= 1)
663  {
664  vlib_buffer_t *p0;
665  ip6_header_t *ip0;
666  icmp46_header_t *icmp0;
667 
668  p0 = vlib_get_buffer (vm, packets[0]);
669  n_packets -= 1;
670  packets += 1;
671 
672  ASSERT (p0->current_data == 0);
673  ip0 = (void *) (p0->data + ip_offset);
674  icmp0 = (void *) (p0->data + icmp_offset);
675 
676  icmp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
677  &bogus_length);
678  ASSERT (bogus_length == 0);
679  }
680 }
681 
682 typedef struct
683 {
684  pg_edit_t type, code;
685  pg_edit_t checksum;
687 
688 always_inline void
690 {
691  /* Initialize fields that are not bit fields in the IP header. */
692 #define _(f) pg_edit_init (&p->f, icmp46_header_t, f);
693  _(type);
694  _(code);
695  _(checksum);
696 #undef _
697 }
698 
699 static uword
700 unformat_pg_icmp_header (unformat_input_t * input, va_list * args)
701 {
702  pg_stream_t *s = va_arg (*args, pg_stream_t *);
704  u32 group_index;
705 
706  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (icmp46_header_t),
707  &group_index);
709 
711 
712  {
713  icmp46_header_t tmp;
714 
715  if (!unformat (input, "ICMP %U", unformat_icmp_type_and_code, &tmp))
716  goto error;
717 
718  pg_edit_set_fixed (&p->type, tmp.type);
719  pg_edit_set_fixed (&p->code, tmp.code);
720  }
721 
722  /* Parse options. */
723  while (1)
724  {
725  if (unformat (input, "checksum %U",
727  ;
728 
729  /* Can't parse input: try next protocol level. */
730  else
731  break;
732  }
733 
734  if (!unformat_user (input, unformat_pg_payload, s))
735  goto error;
736 
738  {
739  pg_edit_group_t *g = pg_stream_get_group (s, group_index);
741  g->edit_function_opaque = 0;
742  }
743 
744  return 1;
745 
746 error:
747  /* Free up any edits we may have added. */
748  pg_free_edit_group (s);
749  return 0;
750 }
751 
752 void
754 {
755  icmp6_main_t *im = &icmp6_main;
756 
757  ASSERT ((int) type < ARRAY_LEN (im->input_next_index_by_type));
758  im->input_next_index_by_type[type]
759  = vlib_node_add_next (vm, ip6_icmp_input_node.index, node_index);
760 }
761 
762 static clib_error_t *
764 {
765  ip_main_t *im = &ip_main;
766  ip_protocol_info_t *pi;
767  icmp6_main_t *cm = &icmp6_main;
768  clib_error_t *error;
769 
771 
772  if (error)
773  return error;
774 
775  pi = ip_get_protocol_info (im, IP_PROTOCOL_ICMP6);
778 
779  cm->type_by_name = hash_create_string (0, sizeof (uword));
780 #define _(n,t) hash_set_mem (cm->type_by_name, #t, (n));
782 #undef _
783 
784  cm->type_and_code_by_name = hash_create_string (0, sizeof (uword));
785 #define _(a,n,t) hash_set_mem (cm->type_by_name, #t, (n) | (ICMP6_##a << 8));
787 #undef _
788 
792  sizeof (cm->max_valid_code_by_type));
793 
794 #define _(a,n,t) cm->max_valid_code_by_type[ICMP6_##a] = clib_max (cm->max_valid_code_by_type[ICMP6_##a], n);
796 #undef _
797 
799  sizeof (cm->min_valid_hop_limit_by_type));
800  cm->min_valid_hop_limit_by_type[ICMP6_router_solicitation] = 255;
801  cm->min_valid_hop_limit_by_type[ICMP6_router_advertisement] = 255;
802  cm->min_valid_hop_limit_by_type[ICMP6_neighbor_solicitation] = 255;
803  cm->min_valid_hop_limit_by_type[ICMP6_neighbor_advertisement] = 255;
804  cm->min_valid_hop_limit_by_type[ICMP6_redirect] = 255;
805 
806  clib_memset (cm->min_valid_length_by_type, sizeof (icmp46_header_t),
807  sizeof (cm->min_valid_length_by_type));
808  cm->min_valid_length_by_type[ICMP6_router_solicitation] =
809  sizeof (icmp6_neighbor_discovery_header_t);
810  cm->min_valid_length_by_type[ICMP6_router_advertisement] =
811  sizeof (icmp6_router_advertisement_header_t);
812  cm->min_valid_length_by_type[ICMP6_neighbor_solicitation] =
813  sizeof (icmp6_neighbor_solicitation_or_advertisement_header_t);
814  cm->min_valid_length_by_type[ICMP6_neighbor_advertisement] =
815  sizeof (icmp6_neighbor_solicitation_or_advertisement_header_t);
816  cm->min_valid_length_by_type[ICMP6_redirect] =
817  sizeof (icmp6_redirect_header_t);
818 
819  icmp6_register_type (vm, ICMP6_echo_request,
821 
823 }
824 
826 
827 /*
828  * fd.io coding-style-patch-verification: ON
829  *
830  * Local Variables:
831  * eval: (c-set-style "gnu")
832  * End:
833  */
Definition: edit.h:64
#define CLIB_UNUSED(x)
Definition: clib.h:82
static char * icmp_error_strings[]
Definition: icmp6.c:125
uword * type_and_code_by_name
Definition: icmp6.c:139
static u8 * format_icmp6_header(u8 *s, va_list *args)
Definition: icmp6.c:85
static clib_error_t * ip6_neighbor_init(vlib_main_t *vm)
static u8 * format_ip6_icmp_type_and_code(u8 *s, va_list *args)
Definition: icmp6.c:45
ip_interface_address_t * if_address_pool
Pool of addresses that are assigned to interfaces.
Definition: lookup.h:125
Definition: pg.h:314
static void pg_edit_set_fixed(pg_edit_t *e, u64 value)
Definition: edit.h:153
#define PREDICT_TRUE(x)
Definition: clib.h:112
u8 packet_data[64]
Definition: icmp6.h:62
static void vlib_error_count(vlib_main_t *vm, uword node_index, uword counter, uword increment)
Definition: error_funcs.h:57
static uword ip6_icmp_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: icmp6.c:158
void(* edit_function)(struct pg_main_t *pg, struct pg_stream_t *s, struct pg_edit_group_t *g, u32 *buffers, u32 n_buffers)
Definition: pg.h:73
u8 ttl
Definition: ip6.h:232
#define VLIB_BUFFER_PRE_DATA_SIZE
Definition: buffer.h:52
icmp6_echo_request_next_t
Definition: icmp6.c:258
int i
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
u8 input_next_index_by_type[256]
Definition: icmp6.c:144
uword unformat_pg_edit(unformat_input_t *input, va_list *args)
Definition: edit.c:106
clib_memset(h->entries, 0, sizeof(h->entries[0])*entries)
uword ip_csum_t
Definition: ip_packet.h:181
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
Definition: ip.h:109
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:494
pg_edit_t code
Definition: icmp4.c:670
ip6_address_t src_address
Definition: ip6_packet.h:378
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1122
unsigned char u8
Definition: types.h:56
u8 min_valid_hop_limit_by_type[256]
Definition: icmp6.c:150
u32 start_byte_offset
Definition: pg.h:67
static pg_edit_group_t * pg_stream_get_group(pg_stream_t *s, u32 group_index)
Definition: pg.h:223
ip6_icmp_error_next_t
Definition: icmp6.c:438
vlib_node_registration_t ip6_icmp_error_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_error_node)
Definition: icmp6.c:606
static vlib_node_registration_t ip6_icmp_echo_request_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_echo_request_node)
Definition: icmp6.c:422
icmp6_main_t icmp6_main
Definition: icmp6.c:155
uword * type_by_name
Definition: icmp6.c:141
unformat_function_t * unformat_pg_edit
Definition: ip.h:90
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:110
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
u32 sw_if_index
Definition: vxlan_gbp.api:37
#define always_inline
Definition: clib.h:98
uword unformat_pg_payload(unformat_input_t *input, va_list *args)
Definition: edit.c:127
pg_edit_type_t type
Definition: edit.h:66
icmp_input_next_t
Definition: icmp6.c:131
static clib_error_t * icmp6_init(vlib_main_t *vm)
Definition: icmp6.c:763
unsigned int u32
Definition: types.h:88
static void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:229
#define vlib_call_init_function(vm, x)
Definition: init.h:260
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:446
static uword ip6_icmp_echo_request(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: icmp6.c:266
static uword unformat_icmp_type_and_code(unformat_input_t *input, va_list *args)
Definition: icmp6.c:626
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
static ip_protocol_info_t * ip_get_protocol_info(ip_main_t *im, u32 protocol)
Definition: ip.h:136
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:114
pg_edit_t type
Definition: icmp4.c:670
format_function_t * format_header
Definition: ip.h:81
struct _unformat_input_t unformat_input_t
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:214
#define PREDICT_FALSE(x)
Definition: clib.h:111
u32 node_index
Node index.
Definition: node.h:519
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:368
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:139
u8 min_valid_length_by_type[256]
Definition: icmp6.c:152
static uword ip6_icmp_error(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: icmp6.c:472
vlib_node_registration_t ip6_icmp_input_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_input_node)
Definition: icmp6.c:240
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
u16 n_vectors
Definition: node.h:420
format_function_t format_ip6_address
Definition: format.h:93
vlib_main_t * vm
Definition: buffer.c:301
ip_main_t ip_main
Definition: ip_init.c:42
static uword unformat_pg_icmp_header(unformat_input_t *input, va_list *args)
Definition: icmp6.c:700
u8 * format_icmp6_input_trace(u8 *s, va_list *va)
Definition: icmp6.c:113
u8 max_valid_code_by_type[256]
Definition: icmp6.c:147
#define ARRAY_LEN(x)
Definition: clib.h:62
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:459
static void * ip6_next_header(ip6_header_t *i)
Definition: ip6_packet.h:405
pg_edit_t checksum
Definition: icmp4.c:671
static void icmp6_pg_edit_function(pg_main_t *pg, pg_stream_t *s, pg_edit_group_t *g, u32 *packets, u32 n_packets)
Definition: icmp6.c:651
u32 * if_address_pool_index_by_sw_if_index
Head of doubly linked list of interface addresses for each software interface.
Definition: lookup.h:132
u16 ip6_tcp_udp_icmp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip6_header_t *ip0, int *bogus_lengthp)
Definition: ip6_forward.c:944
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:538
struct ip6_main_t::@217 host_config
#define ASSERT(truth)
ip6_main_t ip6_main
Definition: ip6_forward.c:2624
ip_lookup_main_t lookup_main
Definition: ip6.h:178
uword unformat_vlib_number_by_name(unformat_input_t *input, va_list *args)
Definition: format.c:157
u32 next_buffer
Next buffer for this linked-list of buffers.
Definition: buffer.h:130
static void pg_free_edit_group(pg_stream_t *s)
Definition: pg.h:282
static u8 icmp6_icmp_type_to_error(u8 type)
Definition: icmp6.c:454
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:233
format_function_t format_ip6_header
Definition: format.h:97
uword edit_function_opaque
Definition: pg.h:79
Definition: pg.h:94
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
#define vec_elt(v, i)
Get vector value at index i.
u32 total_length_not_including_first_buffer
Only valid for first buffer in chain.
Definition: buffer.h:156
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:365
Definition: defs.h:47
void vlib_trace_frame_buffers_only(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, uword n_buffers, uword next_buffer_stride, uword n_buffer_data_bytes_in_trace)
Definition: trace.c:47
u16 payload_length
Definition: ip6_packet.h:369
void icmp6_register_type(vlib_main_t *vm, icmp6_type_t type, u32 node_index)
Definition: icmp6.c:753
icmp6_type_t
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:231
static void pg_icmp_header_init(pg_icmp46_header_t *p)
Definition: icmp6.c:689
uword unformat_pg_number(unformat_input_t *input, va_list *args)
Definition: edit.c:85
#define vnet_buffer(b)
Definition: buffer.h:368
u8 data[0]
Packet data.
Definition: buffer.h:176
u16 flags
Copy of main node flags.
Definition: node.h:532
static void * ip_interface_address_get_address(ip_lookup_main_t *lm, ip_interface_address_t *a)
Definition: lookup.h:175
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:326
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:117
u32 * fib_index_by_sw_if_index
Definition: ip6.h:193
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:237
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:378