FD.io VPP  v17.01.1-3-gc6833f8
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] = "error-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 
345  {
346  ethernet_header_t *eth0;
347  u8 tmp_mac[6];
348  /* For link local, reuse current MAC header by sawpping
349  * SMAC to DMAC instead of IP6 lookup since link local
350  * is not in the IP6 FIB */
351  vlib_buffer_reset (p0);
352  eth0 = vlib_buffer_get_current (p0);
353  clib_memcpy (tmp_mac, eth0->dst_address, 6);
354  clib_memcpy (eth0->dst_address, eth0->src_address, 6);
355  clib_memcpy (eth0->src_address, tmp_mac, 6);
356  vnet_buffer (p0)->sw_if_index[VLIB_TX] =
357  vnet_buffer (p0)->sw_if_index[VLIB_RX];
359  }
360  else
361  {
362  /* Determine the correct lookup fib indices... */
363  fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
364  vnet_buffer (p0)->sw_if_index[VLIB_RX]);
365  vnet_buffer (p0)->sw_if_index[VLIB_TX] = fib_index0;
366  }
367 
369  {
370  ethernet_header_t *eth1;
371  u8 tmp_mac[6];
372  /* For link local, reuse current MAC header by sawpping
373  * SMAC to DMAC instead of IP6 lookup since link local
374  * is not in the IP6 FIB */
375  vlib_buffer_reset (p1);
376  eth1 = vlib_buffer_get_current (p1);
377  clib_memcpy (tmp_mac, eth1->dst_address, 6);
378  clib_memcpy (eth1->dst_address, eth1->src_address, 6);
379  clib_memcpy (eth1->src_address, tmp_mac, 6);
380  vnet_buffer (p1)->sw_if_index[VLIB_TX] =
381  vnet_buffer (p1)->sw_if_index[VLIB_RX];
383  }
384  else
385  {
386  /* Determine the correct lookup fib indices... */
387  fib_index1 = vec_elt (im->fib_index_by_sw_if_index,
388  vnet_buffer (p1)->sw_if_index[VLIB_RX]);
389  vnet_buffer (p1)->sw_if_index[VLIB_TX] = fib_index1;
390  }
391 
392  vnet_buffer (p0)->sw_if_index[VLIB_RX]
394  vnet_buffer (p1)->sw_if_index[VLIB_RX]
396 
397  /* verify speculative enqueues, maybe switch current next frame */
398  /* if next0==next1==next_index then nothing special needs to be done */
399  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
400  to_next, n_left_to_next,
401  bi0, bi1, next0, next1);
402  }
403 
404  while (n_left_from > 0 && n_left_to_next > 0)
405  {
406  vlib_buffer_t *p0;
407  ip6_header_t *ip0;
408  icmp46_header_t *icmp0;
409  u32 bi0;
410  ip6_address_t tmp0;
411  ip_csum_t sum0;
412  u32 fib_index0;
414 
415  bi0 = to_next[0] = from[0];
416 
417  from += 1;
418  n_left_from -= 1;
419  to_next += 1;
420  n_left_to_next -= 1;
421 
422  p0 = vlib_get_buffer (vm, bi0);
423  ip0 = vlib_buffer_get_current (p0);
424  icmp0 = ip6_next_header (ip0);
425 
426  /* Check icmp type to echo reply and update icmp checksum. */
427  sum0 = icmp0->checksum;
428 
429  ASSERT (icmp0->type == ICMP6_echo_request);
430  sum0 = ip_csum_update (sum0, ICMP6_echo_request, ICMP6_echo_reply,
431  icmp46_header_t, type);
432 
433  icmp0->checksum = ip_csum_fold (sum0);
434 
435  icmp0->type = ICMP6_echo_reply;
436 
437  /* Swap source and destination address. */
438  tmp0 = ip0->src_address;
439  ip0->src_address = ip0->dst_address;
440  ip0->dst_address = tmp0;
441 
442  ip0->hop_limit = im->host_config.ttl;
443 
445  {
446  ethernet_header_t *eth0;
447  u8 tmp_mac[6];
448  /* For link local, reuse current MAC header by sawpping
449  * SMAC to DMAC instead of IP6 lookup since link local
450  * is not in the IP6 FIB */
451  vlib_buffer_reset (p0);
452  eth0 = vlib_buffer_get_current (p0);
453  clib_memcpy (tmp_mac, eth0->dst_address, 6);
454  clib_memcpy (eth0->dst_address, eth0->src_address, 6);
455  clib_memcpy (eth0->src_address, tmp_mac, 6);
456  vnet_buffer (p0)->sw_if_index[VLIB_TX] =
457  vnet_buffer (p0)->sw_if_index[VLIB_RX];
459  }
460  else
461  {
462  fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
463  vnet_buffer (p0)->sw_if_index[VLIB_RX]);
464  vnet_buffer (p0)->sw_if_index[VLIB_TX] = fib_index0;
465  }
466  vnet_buffer (p0)->sw_if_index[VLIB_RX]
468 
469  /* Verify speculative enqueue, maybe switch current next frame */
470  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
471  to_next, n_left_to_next,
472  bi0, next0);
473  }
474 
475  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
476  }
477 
479  ICMP6_ERROR_ECHO_REPLIES_SENT, frame->n_vectors);
480 
481  return frame->n_vectors;
482 }
483 
484 /* *INDENT-OFF* */
486  .function = ip6_icmp_echo_request,
487  .name = "ip6-icmp-echo-request",
488 
489  .vector_size = sizeof (u32),
490 
491  .format_trace = format_icmp6_input_trace,
492 
493  .n_next_nodes = ICMP6_ECHO_REQUEST_N_NEXT,
494  .next_nodes = {
495  [ICMP6_ECHO_REQUEST_NEXT_LOOKUP] = "ip6-lookup",
496  [ICMP6_ECHO_REQUEST_NEXT_OUTPUT] = "interface-output",
497  },
498 };
499 /* *INDENT-ON* */
500 
501 typedef enum
502 {
507 
508 void
510 {
511  vnet_buffer (b)->ip.icmp.type = type;
512  vnet_buffer (b)->ip.icmp.code = code;
513  vnet_buffer (b)->ip.icmp.data = data;
514 }
515 
516 static u8
518 {
519  switch (type)
520  {
521  case ICMP6_destination_unreachable:
522  return ICMP6_ERROR_DEST_UNREACH_SENT;
523  case ICMP6_packet_too_big:
524  return ICMP6_ERROR_PACKET_TOO_BIG_SENT;
525  case ICMP6_time_exceeded:
526  return ICMP6_ERROR_TTL_EXPIRE_SENT;
527  case ICMP6_parameter_problem:
528  return ICMP6_ERROR_PARAM_PROBLEM_SENT;
529  default:
530  return ICMP6_ERROR_DROP;
531  }
532 }
533 
534 static uword
536  vlib_node_runtime_t * node, vlib_frame_t * frame)
537 {
538  u32 *from, *to_next;
539  uword n_left_from, n_left_to_next;
540  ip6_icmp_error_next_t next_index;
541  ip6_main_t *im = &ip6_main;
542  ip_lookup_main_t *lm = &im->lookup_main;
543 
544  from = vlib_frame_vector_args (frame);
545  n_left_from = frame->n_vectors;
546  next_index = node->cached_next_index;
547 
548  if (node->flags & VLIB_NODE_FLAG_TRACE)
549  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
550  /* stride */ 1,
551  sizeof (icmp6_input_trace_t));
552 
553  while (n_left_from > 0)
554  {
555  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
556 
557  while (n_left_from > 0 && n_left_to_next > 0)
558  {
559  u32 pi0 = from[0];
561  u8 error0 = ICMP6_ERROR_NONE;
562  vlib_buffer_t *p0;
563  ip6_header_t *ip0, *out_ip0;
564  icmp46_header_t *icmp0;
565  u32 sw_if_index0, if_add_index0;
566  int bogus_length;
567 
568  /* Speculatively enqueue p0 to the current next frame */
569  to_next[0] = pi0;
570  from += 1;
571  to_next += 1;
572  n_left_from -= 1;
573  n_left_to_next -= 1;
574 
575  p0 = vlib_get_buffer (vm, pi0);
576  ip0 = vlib_buffer_get_current (p0);
577  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
578 
579  /* RFC4443 says to keep as much of the original packet as possible
580  * within the minimum MTU. We cheat "a little" here by keeping whatever fits
581  * in the first buffer, to be more efficient */
583  { /* clear current_length of all other buffers in chain */
584  vlib_buffer_t *b = p0;
586  while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
587  {
588  b = vlib_get_buffer (vm, b->next_buffer);
589  b->current_length = 0;
590  }
591  }
592  p0->current_length =
593  p0->current_length > 1280 ? 1280 : p0->current_length;
594 
595  /* Add IP header and ICMPv6 header including a 4 byte data field */
597  -sizeof (ip6_header_t) -
598  sizeof (icmp46_header_t) - 4);
599  out_ip0 = vlib_buffer_get_current (p0);
600  icmp0 = (icmp46_header_t *) & out_ip0[1];
601 
602  /* Fill ip header fields */
604  clib_host_to_net_u32 (0x6 << 28);
605 
606  out_ip0->payload_length =
607  clib_host_to_net_u16 (p0->current_length - sizeof (ip6_header_t));
608  out_ip0->protocol = IP_PROTOCOL_ICMP6;
609  out_ip0->hop_limit = 0xff;
610  out_ip0->dst_address = ip0->src_address;
611  if_add_index0 =
612  lm->if_address_pool_index_by_sw_if_index[sw_if_index0];
613  if (PREDICT_TRUE (if_add_index0 != ~0))
614  {
615  ip_interface_address_t *if_add =
616  pool_elt_at_index (lm->if_address_pool, if_add_index0);
617  ip6_address_t *if_ip =
619  out_ip0->src_address = *if_ip;
620  }
621  else /* interface has no IP6 address - should not happen */
622  {
623  next0 = IP6_ICMP_ERROR_NEXT_DROP;
624  error0 = ICMP6_ERROR_DROP;
625  }
626 
627  /* Fill icmp header fields */
628  icmp0->type = vnet_buffer (p0)->ip.icmp.type;
629  icmp0->code = vnet_buffer (p0)->ip.icmp.code;
630  *((u32 *) (icmp0 + 1)) =
631  clib_host_to_net_u32 (vnet_buffer (p0)->ip.icmp.data);
632  icmp0->checksum = 0;
633  icmp0->checksum =
634  ip6_tcp_udp_icmp_compute_checksum (vm, p0, out_ip0,
635  &bogus_length);
636 
637 
638 
639  /* Update error status */
640  if (error0 == ICMP6_ERROR_NONE)
641  error0 = icmp6_icmp_type_to_error (icmp0->type);
642  vlib_error_count (vm, node->node_index, error0, 1);
643 
644  /* Verify speculative enqueue, maybe switch current next frame */
645  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
646  to_next, n_left_to_next,
647  pi0, next0);
648  }
649  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
650  }
651 
652  return frame->n_vectors;
653 }
654 
655 /* *INDENT-OFF* */
657  .function = ip6_icmp_error,
658  .name = "ip6-icmp-error",
659  .vector_size = sizeof (u32),
660 
661  .n_errors = ARRAY_LEN (icmp_error_strings),
662  .error_strings = icmp_error_strings,
663 
664  .n_next_nodes = IP6_ICMP_ERROR_N_NEXT,
665  .next_nodes = {
666  [IP6_ICMP_ERROR_NEXT_DROP] = "error-drop",
667  [IP6_ICMP_ERROR_NEXT_LOOKUP] = "ip6-lookup",
668  },
669 
670  .format_trace = format_icmp6_input_trace,
671 };
672 /* *INDENT-ON* */
673 
674 
675 static uword
677 {
678  icmp46_header_t *h = va_arg (*args, icmp46_header_t *);
679  icmp6_main_t *cm = &icmp6_main;
680  u32 i;
681 
683  cm->type_and_code_by_name, &i))
684  {
685  h->type = (i >> 8) & 0xff;
686  h->code = (i >> 0) & 0xff;
687  }
689  cm->type_by_name, &i))
690  {
691  h->type = i;
692  h->code = 0;
693  }
694  else
695  return 0;
696 
697  return 1;
698 }
699 
700 static void
702  pg_stream_t * s,
703  pg_edit_group_t * g, u32 * packets, u32 n_packets)
704 {
705  vlib_main_t *vm = vlib_get_main ();
706  u32 ip_offset, icmp_offset;
707  int bogus_length;
708 
709  icmp_offset = g->start_byte_offset;
710  ip_offset = (g - 1)->start_byte_offset;
711 
712  while (n_packets >= 1)
713  {
714  vlib_buffer_t *p0;
715  ip6_header_t *ip0;
716  icmp46_header_t *icmp0;
717 
718  p0 = vlib_get_buffer (vm, packets[0]);
719  n_packets -= 1;
720  packets += 1;
721 
722  ASSERT (p0->current_data == 0);
723  ip0 = (void *) (p0->data + ip_offset);
724  icmp0 = (void *) (p0->data + icmp_offset);
725 
726  icmp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
727  &bogus_length);
728  ASSERT (bogus_length == 0);
729  }
730 }
731 
732 typedef struct
733 {
734  pg_edit_t type, code;
735  pg_edit_t checksum;
737 
738 always_inline void
740 {
741  /* Initialize fields that are not bit fields in the IP header. */
742 #define _(f) pg_edit_init (&p->f, icmp46_header_t, f);
743  _(type);
744  _(code);
745  _(checksum);
746 #undef _
747 }
748 
749 static uword
750 unformat_pg_icmp_header (unformat_input_t * input, va_list * args)
751 {
752  pg_stream_t *s = va_arg (*args, pg_stream_t *);
754  u32 group_index;
755 
756  p = pg_create_edit_group (s, sizeof (p[0]), sizeof (icmp46_header_t),
757  &group_index);
759 
761 
762  {
763  icmp46_header_t tmp;
764 
765  if (!unformat (input, "ICMP %U", unformat_icmp_type_and_code, &tmp))
766  goto error;
767 
768  pg_edit_set_fixed (&p->type, tmp.type);
769  pg_edit_set_fixed (&p->code, tmp.code);
770  }
771 
772  /* Parse options. */
773  while (1)
774  {
775  if (unformat (input, "checksum %U",
777  ;
778 
779  /* Can't parse input: try next protocol level. */
780  else
781  break;
782  }
783 
784  if (!unformat_user (input, unformat_pg_payload, s))
785  goto error;
786 
788  {
789  pg_edit_group_t *g = pg_stream_get_group (s, group_index);
791  g->edit_function_opaque = 0;
792  }
793 
794  return 1;
795 
796 error:
797  /* Free up any edits we may have added. */
798  pg_free_edit_group (s);
799  return 0;
800 }
801 
802 void
804 {
805  icmp6_main_t *im = &icmp6_main;
806 
807  ASSERT ((int) type < ARRAY_LEN (im->input_next_index_by_type));
809  = vlib_node_add_next (vm, ip6_icmp_input_node.index, node_index);
810 }
811 
812 static clib_error_t *
814 {
815  ip_main_t *im = &ip_main;
816  ip_protocol_info_t *pi;
817  icmp6_main_t *cm = &icmp6_main;
818  clib_error_t *error;
819 
821 
822  if (error)
823  return error;
824 
825  pi = ip_get_protocol_info (im, IP_PROTOCOL_ICMP6);
828 
829  cm->type_by_name = hash_create_string (0, sizeof (uword));
830 #define _(n,t) hash_set_mem (cm->type_by_name, #t, (n));
832 #undef _
833 
834  cm->type_and_code_by_name = hash_create_string (0, sizeof (uword));
835 #define _(a,n,t) hash_set_mem (cm->type_by_name, #t, (n) | (ICMP6_##a << 8));
837 #undef _
838 
839  memset (cm->input_next_index_by_type,
841  memset (cm->max_valid_code_by_type, 0, sizeof (cm->max_valid_code_by_type));
842 
843 #define _(a,n,t) cm->max_valid_code_by_type[ICMP6_##a] = clib_max (cm->max_valid_code_by_type[ICMP6_##a], n);
845 #undef _
846 
847  memset (cm->min_valid_hop_limit_by_type, 0,
848  sizeof (cm->min_valid_hop_limit_by_type));
849  cm->min_valid_hop_limit_by_type[ICMP6_router_solicitation] = 255;
850  cm->min_valid_hop_limit_by_type[ICMP6_router_advertisement] = 255;
851  cm->min_valid_hop_limit_by_type[ICMP6_neighbor_solicitation] = 255;
852  cm->min_valid_hop_limit_by_type[ICMP6_neighbor_advertisement] = 255;
853  cm->min_valid_hop_limit_by_type[ICMP6_redirect] = 255;
854 
855  memset (cm->min_valid_length_by_type, sizeof (icmp46_header_t),
856  sizeof (cm->min_valid_length_by_type));
857  cm->min_valid_length_by_type[ICMP6_router_solicitation] =
858  sizeof (icmp6_neighbor_discovery_header_t);
859  cm->min_valid_length_by_type[ICMP6_router_advertisement] =
860  sizeof (icmp6_router_advertisement_header_t);
861  cm->min_valid_length_by_type[ICMP6_neighbor_solicitation] =
862  sizeof (icmp6_neighbor_solicitation_or_advertisement_header_t);
863  cm->min_valid_length_by_type[ICMP6_neighbor_advertisement] =
864  sizeof (icmp6_neighbor_solicitation_or_advertisement_header_t);
865  cm->min_valid_length_by_type[ICMP6_redirect] =
866  sizeof (icmp6_redirect_header_t);
867 
868  icmp6_register_type (vm, ICMP6_echo_request,
870 
872 }
873 
875 
876 /*
877  * fd.io coding-style-patch-verification: ON
878  *
879  * Local Variables:
880  * eval: (c-set-style "gnu")
881  * End:
882  */
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
Definition: edit.h:64
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:343
#define CLIB_UNUSED(x)
Definition: clib.h:79
uword unformat(unformat_input_t *i, char *fmt,...)
Definition: unformat.c:966
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
format_function_t format_ip6_address
Definition: format.h:95
static clib_error_t * ip6_neighbor_init(vlib_main_t *vm)
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
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:375
bad routing header type(not 4)") sr_error (NO_MORE_SEGMENTS
Definition: pg.h:310
static void pg_edit_set_fixed(pg_edit_t *e, u64 value)
Definition: edit.h:153
#define PREDICT_TRUE(x)
Definition: clib.h:98
u8 packet_data[64]
Definition: icmp6.h:65
static void vlib_error_count(vlib_main_t *vm, uword node_index, uword counter, uword increment)
Definition: error_funcs.h:55
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:173
u8 src_address[6]
Definition: packet.h:54
icmp6_echo_request_next_t
Definition: icmp6.c:258
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
uword ip_csum_t
Definition: ip_packet.h:90
Definition: ip.h:106
vlib_error_t * errors
Definition: node.h:419
pg_edit_t code
Definition: icmp4.c:662
ip6_address_t src_address
Definition: ip6_packet.h:337
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1063
struct ip6_main_t::@169 host_config
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:219
ip6_icmp_error_next_t
Definition: icmp6.c:501
vlib_node_registration_t ip6_icmp_error_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_error_node)
Definition: icmp6.c:656
static vlib_node_registration_t ip6_icmp_echo_request_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_echo_request_node)
Definition: icmp6.c:485
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:87
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:78
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:111
u32 local_interface_sw_if_index
Definition: vnet.h:55
#define always_inline
Definition: clib.h:84
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:194
u8 dst_address[6]
Definition: packet.h:53
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:813
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:977
static void * pg_create_edit_group(pg_stream_t *s, int n_edit_bytes, int n_packet_bytes, u32 *group_index)
Definition: pg.h:225
#define vlib_call_init_function(vm, x)
Definition: init.h:161
#define hash_create_string(elts, value_bytes)
Definition: hash.h:652
#define VLIB_BUFFER_NEXT_PRESENT
Definition: buffer.h:97
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:509
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:676
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:369
static ip_protocol_info_t * ip_get_protocol_info(ip_main_t *im, u32 protocol)
Definition: ip.h:133
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:82
pg_edit_t type
Definition: icmp4.c:662
format_function_t * format_header
Definition: ip.h:78
#define PREDICT_FALSE(x)
Definition: clib.h:97
vnet_main_t vnet_main
Definition: misc.c:43
#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
static void vlib_buffer_reset(vlib_buffer_t *b)
Reset current header & length to state they were in when packet was received.
Definition: buffer.h:221
#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:216
#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:350
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:121
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:535
vlib_node_registration_t ip6_icmp_input_node
(constructor) VLIB_REGISTER_NODE (ip6_icmp_input_node)
Definition: icmp6.c:240
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
u16 n_vectors
Definition: node.h:344
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:750
u8 * format_icmp6_input_trace(u8 *s, va_list *va)
Definition: icmp6.c:113
#define clib_memcpy(a, b, c)
Definition: string.h:69
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:207
u8 max_valid_code_by_type[256]
Definition: icmp6.c:147
uword unformat_vlib_number_by_name(unformat_input_t *input, va_list *args)
Definition: format.c:157
#define ARRAY_LEN(x)
Definition: clib.h:59
static void * ip6_next_header(ip6_header_t *i)
Definition: ip6_packet.h:341
pg_edit_t checksum
Definition: icmp4.c:663
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:701
u32 * if_address_pool_index_by_sw_if_index
Head of doubly linked list of interface addresses for each software interface.
Definition: lookup.h:382
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:1141
u16 cached_next_index
Definition: node.h:463
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
#define vnet_buffer(b)
Definition: buffer.h:361
ip6_main_t ip6_main
Definition: ip6_forward.c:2828
ip_lookup_main_t lookup_main
Definition: ip6.h:135
u32 next_buffer
Next buffer for this linked-list of buffers.
Definition: buffer.h:117
static void pg_free_edit_group(pg_stream_t *s)
Definition: pg.h:278
static u8 icmp6_icmp_type_to_error(u8 type)
Definition: icmp6.c:517
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
uword edit_function_opaque
Definition: pg.h:79
Definition: pg.h:96
u64 uword
Definition: types.h:112
#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:112
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:324
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:45
u16 payload_length
Definition: ip6_packet.h:328
static uword ip6_address_is_link_local_unicast(ip6_address_t *a)
Definition: ip6_packet.h:292
void icmp6_register_type(vlib_main_t *vm, icmp6_type_t type, u32 node_index)
Definition: icmp6.c:803
unsigned char u8
Definition: types.h:56
icmp6_type_t
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:253
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:139
static void pg_icmp_header_init(pg_icmp46_header_t *p)
Definition: icmp6.c:739
uword unformat_pg_number(unformat_input_t *input, va_list *args)
Definition: edit.c:85
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
u8 data[0]
Packet data.
Definition: buffer.h:158
struct _unformat_input_t unformat_input_t
static void * ip_interface_address_get_address(ip_lookup_main_t *lm, ip_interface_address_t *a)
Definition: lookup.h:453
format_function_t format_ip6_header
Definition: format.h:98
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:85
u32 * fib_index_by_sw_if_index
Definition: ip6.h:144
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:145
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:337