FD.io VPP  v21.01.1
Vector Packet Processing
ip6_map.c
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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 #include "map.h"
16 
17 #include <vnet/ip/ip_frag.h>
18 #include <vnet/ip/ip4_to_ip6.h>
19 #include <vnet/ip/ip6_to_ip4.h>
21 
23 {
25 #ifdef MAP_SKIP_IP6_LOOKUP
27 #endif
35 };
36 
38 {
42 };
43 
45 {
50 };
51 
53 {
57 };
58 
62 
63 typedef struct
64 {
69 
70 u8 *
72 {
73  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
74  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
76  va_arg (*args, map_ip6_map_ip4_reass_trace_t *);
77  return format (s, "MAP domain index: %d L4 port: %u Status: %s",
78  t->map_domain_index, clib_net_to_host_u16 (t->port),
79  t->cached ? "cached" : "forwarded");
80 }
81 
82 typedef struct
83 {
88 
89 u8 *
90 format_ip6_map_ip6_reass_trace (u8 * s, va_list * args)
91 {
92  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
93  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
95  va_arg (*args, map_ip6_map_ip6_reass_trace_t *);
96  return format (s, "Offset: %d Fragment length: %d Status: %s", t->offset,
97  t->frag_len, t->out ? "out" : "in");
98 }
99 
100 /*
101  * ip6_map_sec_check
102  */
105  ip6_header_t * ip6)
106 {
107  u16 sp4 = clib_net_to_host_u16 (port);
108  u32 sa4 = clib_net_to_host_u32 (ip4->src_address.as_u32);
109  u64 sal6 = map_get_pfx (d, sa4, sp4);
110  u64 sar6 = map_get_sfx (d, sa4, sp4);
111 
112  if (PREDICT_FALSE
113  (sal6 != clib_net_to_host_u64 (ip6->src_address.as_u64[0])
114  || sar6 != clib_net_to_host_u64 (ip6->src_address.as_u64[1])))
115  return (false);
116  return (true);
117 }
118 
121  ip4_header_t * ip4, ip6_header_t * ip6, u32 * next,
122  u8 * error)
123 {
124  map_main_t *mm = &map_main;
125  if (d->ea_bits_len || d->rules)
126  {
127  if (d->psid_length > 0)
128  {
129  if (!ip4_is_fragment (ip4))
130  {
131  u16 port = ip4_get_port (ip4, 1);
132  if (port)
133  {
134  if (mm->sec_check)
135  *error =
136  ip6_map_sec_check (d, port, ip4,
137  ip6) ? MAP_ERROR_NONE :
138  MAP_ERROR_DECAP_SEC_CHECK;
139  }
140  else
141  {
142  *error = MAP_ERROR_BAD_PROTOCOL;
143  }
144  }
145  else
146  {
147  if (mm->sec_check_frag)
148  {
149  vnet_buffer (b0)->ip.reass.next_index =
151  *next = IP6_MAP_NEXT_IP4_REASS;
152  }
153  }
154  }
155  }
156 }
157 
158 /*
159  * ip6_map
160  */
161 static uword
163 {
164  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
165  vlib_node_runtime_t *error_node =
167  map_main_t *mm = &map_main;
169  u32 thread_index = vm->thread_index;
170 
171  from = vlib_frame_vector_args (frame);
172  n_left_from = frame->n_vectors;
173  next_index = node->cached_next_index;
174  while (n_left_from > 0)
175  {
176  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
177 
178  /* Dual loop */
179  while (n_left_from >= 4 && n_left_to_next >= 2)
180  {
181  u32 pi0, pi1;
182  vlib_buffer_t *p0, *p1;
183  u8 error0 = MAP_ERROR_NONE;
184  u8 error1 = MAP_ERROR_NONE;
185  map_domain_t *d0 = 0, *d1 = 0;
186  ip4_header_t *ip40, *ip41;
187  ip6_header_t *ip60, *ip61;
188  u16 port0 = 0, port1 = 0;
189  u32 map_domain_index0 = ~0, map_domain_index1 = ~0;
192 
193  /* Prefetch next iteration. */
194  {
195  vlib_buffer_t *p2, *p3;
196 
197  p2 = vlib_get_buffer (vm, from[2]);
198  p3 = vlib_get_buffer (vm, from[3]);
199 
200  vlib_prefetch_buffer_header (p2, LOAD);
201  vlib_prefetch_buffer_header (p3, LOAD);
202 
203  /* IPv6 + IPv4 header + 8 bytes of ULP */
204  CLIB_PREFETCH (p2->data, 68, LOAD);
205  CLIB_PREFETCH (p3->data, 68, LOAD);
206  }
207 
208  pi0 = to_next[0] = from[0];
209  pi1 = to_next[1] = from[1];
210  from += 2;
211  n_left_from -= 2;
212  to_next += 2;
213  n_left_to_next -= 2;
214 
215  p0 = vlib_get_buffer (vm, pi0);
216  p1 = vlib_get_buffer (vm, pi1);
217  ip60 = vlib_buffer_get_current (p0);
218  ip61 = vlib_buffer_get_current (p1);
219  vlib_buffer_advance (p0, sizeof (ip6_header_t));
220  vlib_buffer_advance (p1, sizeof (ip6_header_t));
221  ip40 = vlib_buffer_get_current (p0);
222  ip41 = vlib_buffer_get_current (p1);
223 
224  /*
225  * Encapsulated IPv4 packet
226  * - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
227  * - Lookup/Rewrite or Fragment node in case of packet > MTU
228  * Fragmented IPv6 packet
229  * ICMP IPv6 packet
230  * - Error -> Pass to ICMPv6/ICMPv4 relay
231  * - Info -> Pass to IPv6 local
232  * Anything else -> drop
233  */
234  if (PREDICT_TRUE
235  (ip60->protocol == IP_PROTOCOL_IP_IN_IP
236  && clib_net_to_host_u16 (ip60->payload_length) > 20))
237  {
238  d0 =
239  ip4_map_get_domain ((ip4_address_t *) & ip40->
240  src_address.as_u32, &map_domain_index0,
241  &error0);
242  }
243  else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
244  clib_net_to_host_u16 (ip60->payload_length) >
245  sizeof (icmp46_header_t))
246  {
247  icmp46_header_t *icmp = (void *) (ip60 + 1);
248  next0 = (icmp->type == ICMP6_echo_request
249  || icmp->type ==
250  ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
252  }
253  else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
254  {
255  error0 = MAP_ERROR_FRAGMENTED;
256  }
257  else
258  {
259  error0 = MAP_ERROR_BAD_PROTOCOL;
260  }
261  if (PREDICT_TRUE
262  (ip61->protocol == IP_PROTOCOL_IP_IN_IP
263  && clib_net_to_host_u16 (ip61->payload_length) > 20))
264  {
265  d1 =
266  ip4_map_get_domain ((ip4_address_t *) & ip41->
267  src_address.as_u32, &map_domain_index1,
268  &error1);
269  }
270  else if (ip61->protocol == IP_PROTOCOL_ICMP6 &&
271  clib_net_to_host_u16 (ip61->payload_length) >
272  sizeof (icmp46_header_t))
273  {
274  icmp46_header_t *icmp = (void *) (ip61 + 1);
275  next1 = (icmp->type == ICMP6_echo_request
276  || icmp->type ==
277  ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
279  }
280  else if (ip61->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
281  {
282  error1 = MAP_ERROR_FRAGMENTED;
283  }
284  else
285  {
286  error1 = MAP_ERROR_BAD_PROTOCOL;
287  }
288 
289  if (d0)
290  {
291  /* MAP inbound security check */
292  ip6_map_security_check (d0, p0, ip40, ip60, &next0, &error0);
293 
294  if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
295  next0 == IP6_MAP_NEXT_IP4_LOOKUP))
296  {
297  if (PREDICT_FALSE
298  (d0->mtu
299  && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
300  {
301  vnet_buffer (p0)->ip_frag.flags = 0;
302  vnet_buffer (p0)->ip_frag.next_index =
304  vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
306  }
307  else
308  {
309  next0 =
311  ip40) ?
312  IP6_MAP_NEXT_IP4_REWRITE : next0;
313  }
315  thread_index,
316  map_domain_index0, 1,
317  clib_net_to_host_u16
318  (ip40->length));
319  }
320  }
321  if (d1)
322  {
323  /* MAP inbound security check */
324  ip6_map_security_check (d1, p1, ip41, ip61, &next1, &error1);
325 
326  if (PREDICT_TRUE (error1 == MAP_ERROR_NONE &&
327  next1 == IP6_MAP_NEXT_IP4_LOOKUP))
328  {
329  if (PREDICT_FALSE
330  (d1->mtu
331  && (clib_host_to_net_u16 (ip41->length) > d1->mtu)))
332  {
333  vnet_buffer (p1)->ip_frag.flags = 0;
334  vnet_buffer (p1)->ip_frag.next_index =
336  vnet_buffer (p1)->ip_frag.mtu = d1->mtu;
338  }
339  else
340  {
341  next1 =
343  ip41) ?
344  IP6_MAP_NEXT_IP4_REWRITE : next1;
345  }
347  thread_index,
348  map_domain_index1, 1,
349  clib_net_to_host_u16
350  (ip41->length));
351  }
352  }
353 
354  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
355  {
356  map_add_trace (vm, node, p0, map_domain_index0, port0);
357  }
358 
359  if (PREDICT_FALSE (p1->flags & VLIB_BUFFER_IS_TRACED))
360  {
361  map_add_trace (vm, node, p1, map_domain_index1, port1);
362  }
363 
364  if (error0 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
365  {
366  /* Set ICMP parameters */
367  vlib_buffer_advance (p0, -sizeof (ip6_header_t));
368  icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
369  ICMP6_destination_unreachable_source_address_failed_policy,
370  0);
371  next0 = IP6_MAP_NEXT_ICMP;
372  }
373  else
374  {
375  next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
376  }
377 
378  if (error1 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
379  {
380  /* Set ICMP parameters */
381  vlib_buffer_advance (p1, -sizeof (ip6_header_t));
382  icmp6_error_set_vnet_buffer (p1, ICMP6_destination_unreachable,
383  ICMP6_destination_unreachable_source_address_failed_policy,
384  0);
385  next1 = IP6_MAP_NEXT_ICMP;
386  }
387  else
388  {
389  next1 = (error1 == MAP_ERROR_NONE) ? next1 : IP6_MAP_NEXT_DROP;
390  }
391 
392  /* Reset packet */
393  if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
394  vlib_buffer_advance (p0, -sizeof (ip6_header_t));
395  if (next1 == IP6_MAP_NEXT_IP6_LOCAL)
396  vlib_buffer_advance (p1, -sizeof (ip6_header_t));
397 
398  p0->error = error_node->errors[error0];
399  p1->error = error_node->errors[error1];
400  vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
401  n_left_to_next, pi0, pi1, next0,
402  next1);
403  }
404 
405  /* Single loop */
406  while (n_left_from > 0 && n_left_to_next > 0)
407  {
408  u32 pi0;
409  vlib_buffer_t *p0;
410  u8 error0 = MAP_ERROR_NONE;
411  map_domain_t *d0 = 0;
412  ip4_header_t *ip40;
413  ip6_header_t *ip60;
414  i32 port0 = 0;
415  u32 map_domain_index0 = ~0;
417 
418  pi0 = to_next[0] = from[0];
419  from += 1;
420  n_left_from -= 1;
421  to_next += 1;
422  n_left_to_next -= 1;
423 
424  p0 = vlib_get_buffer (vm, pi0);
425  ip60 = vlib_buffer_get_current (p0);
426  vlib_buffer_advance (p0, sizeof (ip6_header_t));
427  ip40 = vlib_buffer_get_current (p0);
428 
429  /*
430  * Encapsulated IPv4 packet
431  * - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
432  * - Lookup/Rewrite or Fragment node in case of packet > MTU
433  * Fragmented IPv6 packet
434  * ICMP IPv6 packet
435  * - Error -> Pass to ICMPv6/ICMPv4 relay
436  * - Info -> Pass to IPv6 local
437  * Anything else -> drop
438  */
439  if (PREDICT_TRUE
440  (ip60->protocol == IP_PROTOCOL_IP_IN_IP
441  && clib_net_to_host_u16 (ip60->payload_length) > 20))
442  {
443  d0 =
444  ip4_map_get_domain ((ip4_address_t *) & ip40->
445  src_address.as_u32, &map_domain_index0,
446  &error0);
447  }
448  else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
449  clib_net_to_host_u16 (ip60->payload_length) >
450  sizeof (icmp46_header_t))
451  {
452  icmp46_header_t *icmp = (void *) (ip60 + 1);
453  next0 = (icmp->type == ICMP6_echo_request
454  || icmp->type ==
455  ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
457  }
458  else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION &&
459  (((ip6_frag_hdr_t *) (ip60 + 1))->next_hdr ==
460  IP_PROTOCOL_IP_IN_IP))
461  {
462  error0 = MAP_ERROR_FRAGMENTED;
463  }
464  else
465  {
466  /* XXX: Move get_domain to ip6_get_domain lookup on source */
467  //error0 = MAP_ERROR_BAD_PROTOCOL;
468  vlib_buffer_advance (p0, -sizeof (ip6_header_t));
469  vnet_feature_next (&next0, p0);
470  }
471 
472  if (d0)
473  {
474  /* MAP inbound security check */
475  ip6_map_security_check (d0, p0, ip40, ip60, &next0, &error0);
476 
477  if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
478  next0 == IP6_MAP_NEXT_IP4_LOOKUP))
479  {
480  if (PREDICT_FALSE
481  (d0->mtu
482  && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
483  {
484  vnet_buffer (p0)->ip_frag.flags = 0;
485  vnet_buffer (p0)->ip_frag.next_index =
487  vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
489  }
490  else
491  {
492  next0 =
494  ip40) ?
495  IP6_MAP_NEXT_IP4_REWRITE : next0;
496  }
498  thread_index,
499  map_domain_index0, 1,
500  clib_net_to_host_u16
501  (ip40->length));
502  }
503  }
504 
505  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
506  {
507  map_add_trace (vm, node, p0, map_domain_index0, port0);
508  }
509 
510  if (mm->icmp6_enabled &&
511  (error0 == MAP_ERROR_DECAP_SEC_CHECK
512  || error0 == MAP_ERROR_NO_DOMAIN))
513  {
514  /* Set ICMP parameters */
515  vlib_buffer_advance (p0, -sizeof (ip6_header_t));
516  icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
517  ICMP6_destination_unreachable_source_address_failed_policy,
518  0);
519  next0 = IP6_MAP_NEXT_ICMP;
520  }
521  else
522  {
523  next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
524  }
525 
526  /* Reset packet */
527  if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
528  vlib_buffer_advance (p0, -sizeof (ip6_header_t));
529 
530  p0->error = error_node->errors[error0];
531  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
532  n_left_to_next, pi0, next0);
533  }
534  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
535  }
536 
537  return frame->n_vectors;
538 }
539 
540 
541 void
543 {
548 }
549 
550 /*
551  * ip6_map_post_ip4_reass
552  */
553 static uword
556 {
557  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
558  vlib_node_runtime_t *error_node =
560  map_main_t *mm = &map_main;
562  u32 thread_index = vm->thread_index;
563 
564  from = vlib_frame_vector_args (frame);
565  n_left_from = frame->n_vectors;
566  next_index = node->cached_next_index;
567  while (n_left_from > 0)
568  {
569  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
570 
571  /* Single loop */
572  while (n_left_from > 0 && n_left_to_next > 0)
573  {
574  u32 pi0;
575  vlib_buffer_t *p0;
576  u8 error0 = MAP_ERROR_NONE;
577  map_domain_t *d0;
578  ip4_header_t *ip40;
579  ip6_header_t *ip60;
580  i32 port0 = 0;
581  u32 map_domain_index0 = ~0;
583 
584  pi0 = to_next[0] = from[0];
585  from += 1;
586  n_left_from -= 1;
587  to_next += 1;
588  n_left_to_next -= 1;
589 
590  p0 = vlib_get_buffer (vm, pi0);
591  ip40 = vlib_buffer_get_current (p0);
592  ip60 = ((ip6_header_t *) ip40) - 1;
593 
594  d0 =
596  &map_domain_index0, &error0);
597 
598  port0 = vnet_buffer (p0)->ip.reass.l4_src_port;
599 
600  if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
601  error0 =
602  ip6_map_sec_check (d0, port0, ip40,
603  ip60) ? MAP_ERROR_NONE :
604  MAP_ERROR_DECAP_SEC_CHECK;
605 
606  if (PREDICT_FALSE
607  (error0 == MAP_ERROR_NONE &&
608  d0->mtu && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
609  {
610  vnet_buffer (p0)->ip_frag.flags = 0;
611  vnet_buffer (p0)->ip_frag.next_index = IP_FRAG_NEXT_IP4_LOOKUP;
612  vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
614  }
615 
616  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
617  {
619  vlib_add_trace (vm, node, p0, sizeof (*tr));
620  tr->map_domain_index = map_domain_index0;
621  tr->port = port0;
622  }
623 
624  if (error0 == MAP_ERROR_NONE)
626  thread_index,
627  map_domain_index0, 1,
628  clib_net_to_host_u16
629  (ip40->length));
630  next0 =
631  (error0 ==
632  MAP_ERROR_NONE) ? next0 : IP6_MAP_POST_IP4_REASS_NEXT_DROP;
633  p0->error = error_node->errors[error0];
634  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
635  n_left_to_next, pi0, next0);
636 
637  }
638  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
639  }
640  return frame->n_vectors;
641 }
642 
643 /*
644  * ip6_icmp_relay
645  */
646 static uword
649 {
650  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
651  vlib_node_runtime_t *error_node =
653  map_main_t *mm = &map_main;
654  u32 thread_index = vm->thread_index;
655  u16 *fragment_ids, *fid;
656 
657  from = vlib_frame_vector_args (frame);
658  n_left_from = frame->n_vectors;
659  next_index = node->cached_next_index;
660 
661  /* Get random fragment IDs for replies. */
662  fid = fragment_ids =
664  n_left_from * sizeof (fragment_ids[0]));
665 
666  while (n_left_from > 0)
667  {
668  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
669 
670  /* Single loop */
671  while (n_left_from > 0 && n_left_to_next > 0)
672  {
673  u32 pi0;
674  vlib_buffer_t *p0;
675  u8 error0 = MAP_ERROR_NONE;
676  ip6_header_t *ip60;
678  u32 mtu;
679 
680  pi0 = to_next[0] = from[0];
681  from += 1;
682  n_left_from -= 1;
683  to_next += 1;
684  n_left_to_next -= 1;
685 
686  p0 = vlib_get_buffer (vm, pi0);
687  ip60 = vlib_buffer_get_current (p0);
688  u16 tlen = clib_net_to_host_u16 (ip60->payload_length);
689 
690  /*
691  * In:
692  * IPv6 header (40)
693  * ICMPv6 header (8)
694  * IPv6 header (40)
695  * Original IPv4 header / packet
696  * Out:
697  * New IPv4 header
698  * New ICMP header
699  * Original IPv4 header / packet
700  */
701 
702  /* Need at least ICMP(8) + IPv6(40) + IPv4(20) + L4 header(8) */
703  if (tlen < 76)
704  {
705  error0 = MAP_ERROR_ICMP_RELAY;
706  goto error;
707  }
708 
709  icmp46_header_t *icmp60 = (icmp46_header_t *) (ip60 + 1);
710  ip6_header_t *inner_ip60 = (ip6_header_t *) (icmp60 + 2);
711 
712  if (inner_ip60->protocol != IP_PROTOCOL_IP_IN_IP)
713  {
714  error0 = MAP_ERROR_ICMP_RELAY;
715  goto error;
716  }
717 
718  ip4_header_t *inner_ip40 = (ip4_header_t *) (inner_ip60 + 1);
719  vlib_buffer_advance (p0, 60); /* sizeof ( IPv6 + ICMP + IPv6 - IPv4 - ICMP ) */
720  ip4_header_t *new_ip40 = vlib_buffer_get_current (p0);
721  icmp46_header_t *new_icmp40 = (icmp46_header_t *) (new_ip40 + 1);
722 
723  /*
724  * Relay according to RFC2473, section 8.3
725  */
726  switch (icmp60->type)
727  {
728  case ICMP6_destination_unreachable:
729  case ICMP6_time_exceeded:
730  case ICMP6_parameter_problem:
731  /* Type 3 - destination unreachable, Code 1 - host unreachable */
732  new_icmp40->type = ICMP4_destination_unreachable;
733  new_icmp40->code =
734  ICMP4_destination_unreachable_destination_unreachable_host;
735  break;
736 
737  case ICMP6_packet_too_big:
738  /* Type 3 - destination unreachable, Code 4 - packet too big */
739  /* Potential TODO: Adjust domain tunnel MTU based on the value received here */
740  mtu = clib_net_to_host_u32 (*((u32 *) (icmp60 + 1)));
741 
742  /* Check DF flag */
743  if (!
744  (inner_ip40->flags_and_fragment_offset &
745  clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT)))
746  {
747  error0 = MAP_ERROR_ICMP_RELAY;
748  goto error;
749  }
750 
751  new_icmp40->type = ICMP4_destination_unreachable;
752  new_icmp40->code =
753  ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set;
754  *((u32 *) (new_icmp40 + 1)) =
755  clib_host_to_net_u32 (mtu < 1280 ? 1280 : mtu);
756  break;
757 
758  default:
759  error0 = MAP_ERROR_ICMP_RELAY;
760  break;
761  }
762 
763  /*
764  * Ensure the total ICMP packet is no longer than 576 bytes (RFC1812)
765  */
766  new_ip40->ip_version_and_header_length = 0x45;
767  new_ip40->tos = 0;
768  u16 nlen = (tlen - 20) > 576 ? 576 : tlen - 20;
769  new_ip40->length = clib_host_to_net_u16 (nlen);
770  new_ip40->fragment_id = fid[0];
771  fid++;
772  new_ip40->ttl = 64;
773  new_ip40->protocol = IP_PROTOCOL_ICMP;
774  new_ip40->src_address = mm->icmp4_src_address;
775  new_ip40->dst_address = inner_ip40->src_address;
776  new_ip40->checksum = ip4_header_checksum (new_ip40);
777 
778  new_icmp40->checksum = 0;
779  ip_csum_t sum = ip_incremental_checksum (0, new_icmp40, nlen - 20);
780  new_icmp40->checksum = ~ip_csum_fold (sum);
781 
782  vlib_increment_simple_counter (&mm->icmp_relayed, thread_index, 0,
783  1);
784 
785  error:
786  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
787  {
788  map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
789  tr->map_domain_index = 0;
790  tr->port = 0;
791  }
792 
793  next0 =
794  (error0 == MAP_ERROR_NONE) ? next0 : IP6_ICMP_RELAY_NEXT_DROP;
795  p0->error = error_node->errors[error0];
796  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
797  n_left_to_next, pi0, next0);
798  }
799  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
800  }
801 
802  return frame->n_vectors;
803 
804 }
805 
806 /* *INDENT-OFF* */
807 VNET_FEATURE_INIT (ip6_map_feature, static) =
808 {
809  .arc_name = "ip6-unicast",
810  .node_name = "ip6-map",
811  .runs_before = VNET_FEATURES ("ip6-flow-classify"),
812  .runs_after = VNET_FEATURES ("ip6-full-reassembly-feature"),
813 };
814 
816  .function = ip6_map,
817  .name = "ip6-map",
818  .vector_size = sizeof(u32),
819  .format_trace = format_map_trace,
821 
822  .n_errors = MAP_N_ERROR,
823  .error_counters = map_error_counters,
824 
825  .n_next_nodes = IP6_MAP_N_NEXT,
826  .next_nodes = {
827  [IP6_MAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
828 #ifdef MAP_SKIP_IP6_LOOKUP
829  [IP6_MAP_NEXT_IP4_REWRITE] = "ip4-load-balance",
830 #endif
831  [IP6_MAP_NEXT_IP4_REASS] = "ip4-sv-reassembly-custom-next",
832  [IP6_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag",
833  [IP6_MAP_NEXT_IP6_ICMP_RELAY] = "ip6-map-icmp-relay",
834  [IP6_MAP_NEXT_IP6_LOCAL] = "ip6-local",
835  [IP6_MAP_NEXT_DROP] = "error-drop",
836  [IP6_MAP_NEXT_ICMP] = "ip6-icmp-error",
837  },
838 };
839 /* *INDENT-ON* */
840 
841 /* *INDENT-OFF* */
843  .function = ip6_map_post_ip4_reass,
844  .name = "ip6-map-post-ip4-reass",
845  .vector_size = sizeof(u32),
846  .format_trace = format_ip6_map_post_ip4_reass_trace,
848  .n_errors = MAP_N_ERROR,
849  .error_counters = map_error_counters,
850  .n_next_nodes = IP6_MAP_POST_IP4_REASS_N_NEXT,
851  .next_nodes = {
854  [IP6_MAP_POST_IP4_REASS_NEXT_DROP] = "error-drop",
855  },
856 };
857 /* *INDENT-ON* */
858 
859 /* *INDENT-OFF* */
861  .function = ip6_map_icmp_relay,
862  .name = "ip6-map-icmp-relay",
863  .vector_size = sizeof(u32),
864  .format_trace = format_map_trace, //FIXME
866  .n_errors = MAP_N_ERROR,
867  .error_counters = map_error_counters,
868  .n_next_nodes = IP6_ICMP_RELAY_N_NEXT,
869  .next_nodes = {
870  [IP6_ICMP_RELAY_NEXT_IP4_LOOKUP] = "ip4-lookup",
871  [IP6_ICMP_RELAY_NEXT_DROP] = "error-drop",
872  },
873 };
874 /* *INDENT-ON* */
875 
876 clib_error_t *
878 {
882  return 0;
883 }
884 
886 {
887 .runs_after = VLIB_INITS ("map_init"),};
888 
889 /*
890  * fd.io coding-style-patch-verification: ON
891  *
892  * Local Variables:
893  * eval: (c-set-style "gnu")
894  * End:
895  */
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:124
static void map_add_trace(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b, u32 map_domain_index, u16 port)
Definition: map.h:222
u8 psid_length
Definition: map.h:92
#define CLIB_UNUSED(x)
Definition: clib.h:87
map_main_t map_main
Definition: map.c:27
static_always_inline bool ip6_map_sec_check(map_domain_t *d, u16 port, ip4_header_t *ip4, ip6_header_t *ip6)
Definition: ip6_map.c:104
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:239
static_always_inline u64 map_get_pfx(map_domain_t *d, u32 addr, u16 port)
Definition: map.h:249
ip4_address_t src_address
Definition: ip4_packet.h:125
static void vlib_set_next_frame_buffer(vlib_main_t *vm, vlib_node_runtime_t *node, u32 next_index, u32 buffer_index)
Definition: node_funcs.h:424
#define PREDICT_TRUE(x)
Definition: clib.h:122
unsigned long u64
Definition: types.h:89
static uword ip6_map_post_ip4_reass(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip6_map.c:554
static void * clib_random_buffer_get_data(clib_random_buffer_t *b, uword n_bytes)
Definition: random_buffer.h:83
u32 thread_index
Definition: main.h:250
ip6_icmp_relay_next_e
Definition: ip6_map.c:52
static_always_inline map_domain_t * ip4_map_get_domain(ip4_address_t *addr, u32 *map_domain_index, u8 *error)
Definition: map.h:314
bool sec_check_frag
Definition: map.h:184
uword ip_csum_t
Definition: ip_packet.h:246
vlib_main_t * vm
Definition: in2out_ed.c:1580
ip6_map_post_ip4_reass_next_e
Definition: ip6_map.c:44
static void vlib_increment_simple_counter(vlib_simple_counter_main_t *cm, u32 thread_index, u32 index, u64 increment)
Increment a simple counter.
Definition: counter.h:78
u16 flags_and_fragment_offset
Definition: ip4_packet.h:106
static_always_inline bool ip6_map_ip4_lookup_bypass(vlib_buffer_t *p0, ip4_header_t *ip)
Definition: map.h:486
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
ip6_address_t src_address
Definition: ip6_packet.h:310
unsigned char u8
Definition: types.h:56
vlib_node_registration_t ip6_map_node
(constructor) VLIB_REGISTER_NODE (ip6_map_node)
Definition: ip6_map.c:815
IPv4 to IPv6 translation.
u16 port
Definition: map.h:218
static int ip4_is_fragment(const ip4_header_t *i)
Definition: ip4_packet.h:168
#define static_always_inline
Definition: clib.h:109
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
vl_api_ip6_address_t ip6
Definition: one.api:424
ip4_address_t dst_address
Definition: ip4_packet.h:125
vlib_combined_counter_main_t * domain_counters
Definition: map.h:173
ip4_address_t icmp4_src_address
Definition: map.h:190
description fragment has unexpected format
Definition: map.api:433
vlib_node_registration_t ip6_map_ip6_reass_node
Definition: ip6_map.c:60
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:207
vlib_simple_counter_main_t icmp_relayed
Definition: map.h:191
ip6_address_t * rules
Definition: map.h:82
u8 ea_bits_len
Definition: map.h:90
unsigned int u32
Definition: types.h:88
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:446
static u16 ip4_get_port(ip4_header_t *ip, u8 sender)
Get TCP/UDP port number or ICMP id from IPv4 packet.
Definition: ip4_to_ip6.h:51
vl_api_fib_path_type_t type
Definition: fib_types.api:123
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
vnet_crypto_main_t * cm
Definition: quic_crypto.c:53
Definition: cJSON.c:84
clib_error_t * ip6_map_init(vlib_main_t *vm)
Definition: ip6_map.c:877
VNET_FEATURE_INIT(ip6_map_feature, static)
IPv4 shallow virtual reassembly.
icmp
Definition: map.api:387
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:233
#define PREDICT_FALSE(x)
Definition: clib.h:121
vl_api_ip4_address_t ip4
Definition: one.api:376
vl_api_address_union_t src_address
Definition: ip_types.api:122
#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:224
#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:391
u8 * format_ip6_map_post_ip4_reass_trace(u8 *s, va_list *args)
Definition: ip6_map.c:71
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:170
u16 n_vectors
Definition: node.h:397
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_node_registration_t ip6_map_post_ip4_reass_node
(constructor) VLIB_REGISTER_NODE (ip6_map_post_ip4_reass_node)
Definition: ip6_map.c:59
static_always_inline void vnet_feature_next(u32 *next0, vlib_buffer_t *b0)
Definition: feature.h:322
static vlib_node_runtime_t * vlib_node_get_runtime(vlib_main_t *vm, u32 node_index)
Get node runtime by node index.
Definition: node_funcs.h:115
u8 data[]
Packet data.
Definition: buffer.h:181
static uword ip6_map_icmp_relay(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip6_map.c:647
bool icmp6_enabled
Definition: map.h:185
static_always_inline void ip6_map_security_check(map_domain_t *d, vlib_buffer_t *b0, ip4_header_t *ip4, ip6_header_t *ip6, u32 *next, u8 *error)
Definition: ip6_map.c:120
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:483
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1580
signed int i32
Definition: types.h:77
static uword ip6_map(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip6_map.c:162
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:511
bool sec_check
Definition: map.h:183
ip6_map_next_e
Definition: ip6_map.c:22
ip_dscp_t tos
Definition: ip4_packet.h:96
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:252
static vlib_node_registration_t ip6_map_icmp_relay_node
(constructor) VLIB_REGISTER_NODE (ip6_map_icmp_relay_node)
Definition: ip6_map.c:61
u8 * format_map_trace(u8 *s, va_list *args)
Definition: map.c:1204
IPv6 to IPv4 translation.
u8 * format_ip6_map_ip6_reass_trace(u8 *s, va_list *args)
Definition: ip6_map.c:90
#define VNET_FEATURES(...)
Definition: feature.h:470
ip6_map_ip6_reass_next_e
Definition: ip6_map.c:37
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
struct _vlib_node_registration vlib_node_registration_t
u16 mtu
Definition: map.h:86
u16 payload_length
Definition: ip6_packet.h:301
vlib_main_t vlib_node_runtime_t vlib_frame_t * frame
Definition: in2out_ed.c:1581
VLIB buffer representation.
Definition: buffer.h:102
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:297
A collection of combined counters.
Definition: counter.h:207
u16 port
Definition: lb_types.api:73
uword ip4_sv_reass_custom_next_index
Definition: map.h:209
#define vnet_buffer(b)
Definition: buffer.h:417
#define IP4_HEADER_FLAG_DONT_FRAGMENT
Definition: ip4_packet.h:108
static_always_inline u64 map_get_sfx(map_domain_t *d, u32 addr, u16 port)
Definition: map.h:274
u32 map_domain_index
Definition: map.h:217
void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace.c:634
u8 ip_version_and_header_length
Definition: ip4_packet.h:93
static ip_csum_t ip_incremental_checksum(ip_csum_t sum, void *_data, uword n_bytes)
Definition: ip_packet.h:320
uword ip4_sv_reass_custom_register_next_node(uword node_index)
#define VLIB_INITS(...)
Definition: init.h:357
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:314
clib_random_buffer_t random_buffer
Definition: main.h:244
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:302
void map_ip6_drop_pi(u32 pi)
Definition: ip6_map.c:542