2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 #include <vnet/ip/ip_frag.h>
18 #include <vnet/ip/ip4_to_ip6.h>
19 #include <vnet/ip/ip6_to_ip4.h>
23 IP6_MAP_NEXT_IP4_LOOKUP,
24 #ifdef MAP_SKIP_IP6_LOOKUP
25 IP6_MAP_NEXT_IP4_REWRITE,
27 IP6_MAP_NEXT_IP6_REASS,
28 IP6_MAP_NEXT_IP4_REASS,
29 IP6_MAP_NEXT_IP4_FRAGMENT,
30 IP6_MAP_NEXT_IP6_ICMP_RELAY,
31 IP6_MAP_NEXT_IP6_LOCAL,
37 enum ip6_map_ip6_reass_next_e
39 IP6_MAP_IP6_REASS_NEXT_IP6_MAP,
40 IP6_MAP_IP6_REASS_NEXT_DROP,
41 IP6_MAP_IP6_REASS_N_NEXT,
44 enum ip6_map_ip4_reass_next_e
46 IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP,
47 IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT,
48 IP6_MAP_IP4_REASS_NEXT_DROP,
49 IP6_MAP_IP4_REASS_N_NEXT,
52 enum ip6_icmp_relay_next_e
54 IP6_ICMP_RELAY_NEXT_IP4_LOOKUP,
55 IP6_ICMP_RELAY_NEXT_DROP,
56 IP6_ICMP_RELAY_N_NEXT,
59 vlib_node_registration_t ip6_map_ip4_reass_node;
60 vlib_node_registration_t ip6_map_ip6_reass_node;
61 static vlib_node_registration_t ip6_map_icmp_relay_node;
68 } map_ip6_map_ip4_reass_trace_t;
71 format_ip6_map_ip4_reass_trace (u8 * s, va_list * args)
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 *);
75 map_ip6_map_ip4_reass_trace_t *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, t->port,
79 t->cached ? "cached" : "forwarded");
87 } map_ip6_map_ip6_reass_trace_t;
90 format_ip6_map_ip6_reass_trace (u8 * s, va_list * args)
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 *);
94 map_ip6_map_ip6_reass_trace_t *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");
103 static_always_inline bool
104 ip6_map_sec_check (map_domain_t * d, u16 port, ip4_header_t * ip4,
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);
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])))
119 static_always_inline void
120 ip6_map_security_check (map_domain_t * d, ip4_header_t * ip4,
121 ip6_header_t * ip6, u32 * next, u8 * error)
123 map_main_t *mm = &map_main;
124 if (d->ea_bits_len || d->rules)
126 if (d->psid_length > 0)
128 if (!ip4_is_fragment (ip4))
130 u16 port = ip4_get_port (ip4, 1);
135 ip6_map_sec_check (d, port, ip4,
136 ip6) ? MAP_ERROR_NONE :
137 MAP_ERROR_DECAP_SEC_CHECK;
141 *error = MAP_ERROR_BAD_PROTOCOL;
146 *next = mm->sec_check_frag ? IP6_MAP_NEXT_IP4_REASS : *next;
152 static_always_inline bool
153 ip6_map_ip4_lookup_bypass (vlib_buffer_t * p0, ip4_header_t * ip)
155 #ifdef MAP_SKIP_IP6_LOOKUP
156 if (FIB_NODE_INDEX_INVALID != pre_resolved[FIB_PROTOCOL_IP4].fei)
158 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
159 pre_resolved[FIB_PROTOCOL_IP4].dpo.dpoi_index;
170 ip6_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
172 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
173 vlib_node_runtime_t *error_node =
174 vlib_node_get_runtime (vm, ip6_map_node.index);
175 map_main_t *mm = &map_main;
176 vlib_combined_counter_main_t *cm = mm->domain_counters;
177 u32 thread_index = vm->thread_index;
179 from = vlib_frame_vector_args (frame);
180 n_left_from = frame->n_vectors;
181 next_index = node->cached_next_index;
182 while (n_left_from > 0)
184 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
187 while (n_left_from >= 4 && n_left_to_next >= 2)
190 vlib_buffer_t *p0, *p1;
191 u8 error0 = MAP_ERROR_NONE;
192 u8 error1 = MAP_ERROR_NONE;
193 map_domain_t *d0 = 0, *d1 = 0;
194 ip4_header_t *ip40, *ip41;
195 ip6_header_t *ip60, *ip61;
196 u16 port0 = 0, port1 = 0;
197 u32 map_domain_index0 = ~0, map_domain_index1 = ~0;
198 u32 next0 = IP6_MAP_NEXT_IP4_LOOKUP;
199 u32 next1 = IP6_MAP_NEXT_IP4_LOOKUP;
201 /* Prefetch next iteration. */
203 vlib_buffer_t *p2, *p3;
205 p2 = vlib_get_buffer (vm, from[2]);
206 p3 = vlib_get_buffer (vm, from[3]);
208 vlib_prefetch_buffer_header (p2, LOAD);
209 vlib_prefetch_buffer_header (p3, LOAD);
211 /* IPv6 + IPv4 header + 8 bytes of ULP */
212 CLIB_PREFETCH (p2->data, 68, LOAD);
213 CLIB_PREFETCH (p3->data, 68, LOAD);
216 pi0 = to_next[0] = from[0];
217 pi1 = to_next[1] = from[1];
223 p0 = vlib_get_buffer (vm, pi0);
224 p1 = vlib_get_buffer (vm, pi1);
225 ip60 = vlib_buffer_get_current (p0);
226 ip61 = vlib_buffer_get_current (p1);
227 vlib_buffer_advance (p0, sizeof (ip6_header_t));
228 vlib_buffer_advance (p1, sizeof (ip6_header_t));
229 ip40 = vlib_buffer_get_current (p0);
230 ip41 = vlib_buffer_get_current (p1);
233 * Encapsulated IPv4 packet
234 * - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
235 * - Lookup/Rewrite or Fragment node in case of packet > MTU
236 * Fragmented IPv6 packet
238 * - Error -> Pass to ICMPv6/ICMPv4 relay
239 * - Info -> Pass to IPv6 local
240 * Anything else -> drop
243 (ip60->protocol == IP_PROTOCOL_IP_IN_IP
244 && clib_net_to_host_u16 (ip60->payload_length) > 20))
247 ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
248 (ip4_address_t *) & ip40->
249 src_address.as_u32, &map_domain_index0,
252 else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
253 clib_net_to_host_u16 (ip60->payload_length) >
254 sizeof (icmp46_header_t))
256 icmp46_header_t *icmp = (void *) (ip60 + 1);
257 next0 = (icmp->type == ICMP6_echo_request
259 ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
260 IP6_MAP_NEXT_IP6_ICMP_RELAY;
262 else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
264 next0 = IP6_MAP_NEXT_IP6_REASS;
268 error0 = MAP_ERROR_BAD_PROTOCOL;
271 (ip61->protocol == IP_PROTOCOL_IP_IN_IP
272 && clib_net_to_host_u16 (ip61->payload_length) > 20))
275 ip6_map_get_domain (vnet_buffer (p1)->ip.adj_index[VLIB_TX],
276 (ip4_address_t *) & ip41->
277 src_address.as_u32, &map_domain_index1,
280 else if (ip61->protocol == IP_PROTOCOL_ICMP6 &&
281 clib_net_to_host_u16 (ip61->payload_length) >
282 sizeof (icmp46_header_t))
284 icmp46_header_t *icmp = (void *) (ip61 + 1);
285 next1 = (icmp->type == ICMP6_echo_request
287 ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
288 IP6_MAP_NEXT_IP6_ICMP_RELAY;
290 else if (ip61->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
292 next1 = IP6_MAP_NEXT_IP6_REASS;
296 error1 = MAP_ERROR_BAD_PROTOCOL;
301 /* MAP inbound security check */
302 ip6_map_security_check (d0, ip40, ip60, &next0, &error0);
304 if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
305 next0 == IP6_MAP_NEXT_IP4_LOOKUP))
309 && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
311 vnet_buffer (p0)->ip_frag.flags = 0;
312 vnet_buffer (p0)->ip_frag.next_index =
313 IP4_FRAG_NEXT_IP4_LOOKUP;
314 vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
315 next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
320 ip6_map_ip4_lookup_bypass (p0,
322 IP6_MAP_NEXT_IP4_REWRITE : next0;
324 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
326 map_domain_index0, 1,
333 /* MAP inbound security check */
334 ip6_map_security_check (d1, ip41, ip61, &next1, &error1);
336 if (PREDICT_TRUE (error1 == MAP_ERROR_NONE &&
337 next1 == IP6_MAP_NEXT_IP4_LOOKUP))
341 && (clib_host_to_net_u16 (ip41->length) > d1->mtu)))
343 vnet_buffer (p1)->ip_frag.flags = 0;
344 vnet_buffer (p1)->ip_frag.next_index =
345 IP4_FRAG_NEXT_IP4_LOOKUP;
346 vnet_buffer (p1)->ip_frag.mtu = d1->mtu;
347 next1 = IP6_MAP_NEXT_IP4_FRAGMENT;
352 ip6_map_ip4_lookup_bypass (p1,
354 IP6_MAP_NEXT_IP4_REWRITE : next1;
356 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
358 map_domain_index1, 1,
364 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
366 map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
367 tr->map_domain_index = map_domain_index0;
371 if (PREDICT_FALSE (p1->flags & VLIB_BUFFER_IS_TRACED))
373 map_trace_t *tr = vlib_add_trace (vm, node, p1, sizeof (*tr));
374 tr->map_domain_index = map_domain_index1;
378 if (error0 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
380 /* Set ICMP parameters */
381 vlib_buffer_advance (p0, -sizeof (ip6_header_t));
382 icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
383 ICMP6_destination_unreachable_source_address_failed_policy,
385 next0 = IP6_MAP_NEXT_ICMP;
389 next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
392 if (error1 == MAP_ERROR_DECAP_SEC_CHECK && mm->icmp6_enabled)
394 /* Set ICMP parameters */
395 vlib_buffer_advance (p1, -sizeof (ip6_header_t));
396 icmp6_error_set_vnet_buffer (p1, ICMP6_destination_unreachable,
397 ICMP6_destination_unreachable_source_address_failed_policy,
399 next1 = IP6_MAP_NEXT_ICMP;
403 next1 = (error1 == MAP_ERROR_NONE) ? next1 : IP6_MAP_NEXT_DROP;
407 if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
408 vlib_buffer_advance (p0, -sizeof (ip6_header_t));
409 if (next1 == IP6_MAP_NEXT_IP6_LOCAL)
410 vlib_buffer_advance (p1, -sizeof (ip6_header_t));
412 p0->error = error_node->errors[error0];
413 p1->error = error_node->errors[error1];
414 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
415 n_left_to_next, pi0, pi1, next0,
420 while (n_left_from > 0 && n_left_to_next > 0)
424 u8 error0 = MAP_ERROR_NONE;
425 map_domain_t *d0 = 0;
429 u32 map_domain_index0 = ~0;
430 u32 next0 = IP6_MAP_NEXT_IP4_LOOKUP;
432 pi0 = to_next[0] = from[0];
438 p0 = vlib_get_buffer (vm, pi0);
439 ip60 = vlib_buffer_get_current (p0);
440 vlib_buffer_advance (p0, sizeof (ip6_header_t));
441 ip40 = vlib_buffer_get_current (p0);
444 * Encapsulated IPv4 packet
445 * - IPv4 fragmented -> Pass to virtual reassembly unless security check disabled
446 * - Lookup/Rewrite or Fragment node in case of packet > MTU
447 * Fragmented IPv6 packet
449 * - Error -> Pass to ICMPv6/ICMPv4 relay
450 * - Info -> Pass to IPv6 local
451 * Anything else -> drop
454 (ip60->protocol == IP_PROTOCOL_IP_IN_IP
455 && clib_net_to_host_u16 (ip60->payload_length) > 20))
458 ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
459 (ip4_address_t *) & ip40->
460 src_address.as_u32, &map_domain_index0,
463 else if (ip60->protocol == IP_PROTOCOL_ICMP6 &&
464 clib_net_to_host_u16 (ip60->payload_length) >
465 sizeof (icmp46_header_t))
467 icmp46_header_t *icmp = (void *) (ip60 + 1);
468 next0 = (icmp->type == ICMP6_echo_request
470 ICMP6_echo_reply) ? IP6_MAP_NEXT_IP6_LOCAL :
471 IP6_MAP_NEXT_IP6_ICMP_RELAY;
473 else if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION &&
474 (((ip6_frag_hdr_t *) (ip60 + 1))->next_hdr ==
475 IP_PROTOCOL_IP_IN_IP))
477 next0 = IP6_MAP_NEXT_IP6_REASS;
481 error0 = MAP_ERROR_BAD_PROTOCOL;
486 /* MAP inbound security check */
487 ip6_map_security_check (d0, ip40, ip60, &next0, &error0);
489 if (PREDICT_TRUE (error0 == MAP_ERROR_NONE &&
490 next0 == IP6_MAP_NEXT_IP4_LOOKUP))
494 && (clib_host_to_net_u16 (ip40->length) > d0->mtu)))
496 vnet_buffer (p0)->ip_frag.flags = 0;
497 vnet_buffer (p0)->ip_frag.next_index =
498 IP4_FRAG_NEXT_IP4_LOOKUP;
499 vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
500 next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
505 ip6_map_ip4_lookup_bypass (p0,
507 IP6_MAP_NEXT_IP4_REWRITE : next0;
509 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
511 map_domain_index0, 1,
517 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
519 map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
520 tr->map_domain_index = map_domain_index0;
521 tr->port = (u16) port0;
524 if (mm->icmp6_enabled &&
525 (error0 == MAP_ERROR_DECAP_SEC_CHECK
526 || error0 == MAP_ERROR_NO_DOMAIN))
528 /* Set ICMP parameters */
529 vlib_buffer_advance (p0, -sizeof (ip6_header_t));
530 icmp6_error_set_vnet_buffer (p0, ICMP6_destination_unreachable,
531 ICMP6_destination_unreachable_source_address_failed_policy,
533 next0 = IP6_MAP_NEXT_ICMP;
537 next0 = (error0 == MAP_ERROR_NONE) ? next0 : IP6_MAP_NEXT_DROP;
541 if (next0 == IP6_MAP_NEXT_IP6_LOCAL)
542 vlib_buffer_advance (p0, -sizeof (ip6_header_t));
544 p0->error = error_node->errors[error0];
545 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
546 n_left_to_next, pi0, next0);
548 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
551 return frame->n_vectors;
555 static_always_inline void
556 ip6_map_ip6_reass_prepare (vlib_main_t * vm, vlib_node_runtime_t * node,
557 map_ip6_reass_t * r, u32 ** fragments_ready,
558 u32 ** fragments_to_drop)
562 ip6_frag_hdr_t *frag0;
565 if (!r->ip4_header.ip_version_and_header_length)
568 //The IP header is here, we need to check for packets
569 //that can be forwarded
571 for (i = 0; i < MAP_IP6_REASS_MAX_FRAGMENTS_PER_REASSEMBLY; i++)
573 if (r->fragments[i].pi == ~0 ||
574 ((!r->fragments[i].next_data_len)
575 && (r->fragments[i].next_data_offset != (0xffff))))
578 p0 = vlib_get_buffer (vm, r->fragments[i].pi);
579 ip60 = vlib_buffer_get_current (p0);
580 frag0 = (ip6_frag_hdr_t *) (ip60 + 1);
581 ip40 = (ip4_header_t *) (frag0 + 1);
583 if (ip6_frag_hdr_offset (frag0))
585 //Not first fragment, add the IPv4 header
586 clib_memcpy (ip40, &r->ip4_header, 20);
589 #ifdef MAP_IP6_REASS_COUNT_BYTES
591 clib_net_to_host_u16 (ip60->payload_length) - sizeof (*frag0);
594 if (ip6_frag_hdr_more (frag0))
596 //Not last fragment, we copy end of next
597 clib_memcpy (u8_ptr_add (ip60, p0->current_length),
598 r->fragments[i].next_data, 20);
599 p0->current_length += 20;
600 ip60->payload_length = u16_net_add (ip60->payload_length, 20);
603 if (!ip4_is_fragment (ip40))
605 ip40->fragment_id = frag_id_6to4 (frag0->identification);
606 ip40->flags_and_fragment_offset =
607 clib_host_to_net_u16 (ip6_frag_hdr_offset (frag0));
611 ip40->flags_and_fragment_offset =
612 clib_host_to_net_u16 (ip4_get_fragment_offset (ip40) +
613 ip6_frag_hdr_offset (frag0));
616 if (ip6_frag_hdr_more (frag0))
617 ip40->flags_and_fragment_offset |=
618 clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS);
621 clib_host_to_net_u16 (p0->current_length - sizeof (*ip60) -
623 ip40->checksum = ip4_header_checksum (ip40);
625 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
627 map_ip6_map_ip6_reass_trace_t *tr =
628 vlib_add_trace (vm, node, p0, sizeof (*tr));
629 tr->offset = ip4_get_fragment_offset (ip40);
630 tr->frag_len = clib_net_to_host_u16 (ip40->length) - sizeof (*ip40);
634 vec_add1 (*fragments_ready, r->fragments[i].pi);
635 r->fragments[i].pi = ~0;
636 r->fragments[i].next_data_len = 0;
637 r->fragments[i].next_data_offset = 0;
638 map_main.ip6_reass_buffered_counter--;
640 //TODO: Best solution would be that ip6_map handles extension headers
641 // and ignores atomic fragment. But in the meantime, let's just copy the header.
643 u8 protocol = frag0->next_hdr;
644 memmove (u8_ptr_add (ip40, -sizeof (*ip60)), ip60, sizeof (*ip60));
645 ((ip6_header_t *) u8_ptr_add (ip40, -sizeof (*ip60)))->protocol =
647 vlib_buffer_advance (p0, sizeof (*frag0));
652 map_ip6_drop_pi (u32 pi)
654 vlib_main_t *vm = vlib_get_main ();
655 vlib_node_runtime_t *n =
656 vlib_node_get_runtime (vm, ip6_map_ip6_reass_node.index);
657 vlib_set_next_frame_buffer (vm, n, IP6_MAP_IP6_REASS_NEXT_DROP, pi);
661 map_ip4_drop_pi (u32 pi)
663 vlib_main_t *vm = vlib_get_main ();
664 vlib_node_runtime_t *n =
665 vlib_node_get_runtime (vm, ip6_map_ip4_reass_node.index);
666 vlib_set_next_frame_buffer (vm, n, IP6_MAP_IP4_REASS_NEXT_DROP, pi);
671 * TODO: We should count the number of successfully
672 * transmitted fragment bytes and compare that to the last fragment
673 * offset such that we can free the reassembly structure when all fragments
674 * have been forwarded.
677 ip6_map_ip6_reass (vlib_main_t * vm,
678 vlib_node_runtime_t * node, vlib_frame_t * frame)
680 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
681 vlib_node_runtime_t *error_node =
682 vlib_node_get_runtime (vm, ip6_map_ip6_reass_node.index);
683 u32 *fragments_to_drop = NULL;
684 u32 *fragments_ready = NULL;
686 from = vlib_frame_vector_args (frame);
687 n_left_from = frame->n_vectors;
688 next_index = node->cached_next_index;
689 while (n_left_from > 0)
691 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
694 while (n_left_from > 0 && n_left_to_next > 0)
698 u8 error0 = MAP_ERROR_NONE;
700 ip6_frag_hdr_t *frag0;
705 pi0 = to_next[0] = from[0];
711 p0 = vlib_get_buffer (vm, pi0);
712 ip60 = vlib_buffer_get_current (p0);
713 frag0 = (ip6_frag_hdr_t *) (ip60 + 1);
715 clib_host_to_net_u16 (frag0->fragment_offset_and_more) & (~7);
717 clib_net_to_host_u16 (ip60->payload_length) - sizeof (*frag0);
719 ip6_frag_hdr_more (frag0) ? (offset + frag_len) : (0xffff);
721 //FIXME: Support other extension headers, maybe
723 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
725 map_ip6_map_ip6_reass_trace_t *tr =
726 vlib_add_trace (vm, node, p0, sizeof (*tr));
728 tr->frag_len = frag_len;
732 map_ip6_reass_lock ();
734 map_ip6_reass_get (&ip60->src_address, &ip60->dst_address,
735 frag0->identification, frag0->next_hdr,
737 //FIXME: Use better error codes
738 if (PREDICT_FALSE (!r))
740 // Could not create a caching entry
741 error0 = MAP_ERROR_FRAGMENT_MEMORY;
743 else if (PREDICT_FALSE ((frag_len <= 20 &&
744 (ip6_frag_hdr_more (frag0) || (!offset)))))
746 //Very small fragment are restricted to the last one and
747 //can't be the first one
748 error0 = MAP_ERROR_FRAGMENT_MALFORMED;
751 if (map_ip6_reass_add_fragment
752 (r, pi0, offset, next_offset, (u8 *) (frag0 + 1), frag_len))
754 map_ip6_reass_free (r, &fragments_to_drop);
755 error0 = MAP_ERROR_FRAGMENT_MEMORY;
759 #ifdef MAP_IP6_REASS_COUNT_BYTES
760 if (!ip6_frag_hdr_more (frag0))
761 r->expected_total = offset + frag_len;
763 ip6_map_ip6_reass_prepare (vm, node, r, &fragments_ready,
765 #ifdef MAP_IP6_REASS_COUNT_BYTES
766 if (r->forwarded >= r->expected_total)
767 map_ip6_reass_free (r, &fragments_to_drop);
770 map_ip6_reass_unlock ();
772 if (error0 == MAP_ERROR_NONE)
782 //All data from that packet was copied no need to keep it, but this is not an error
783 p0->error = error_node->errors[MAP_ERROR_NONE];
784 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
785 to_next, n_left_to_next,
787 IP6_MAP_IP6_REASS_NEXT_DROP);
792 p0->error = error_node->errors[error0];
793 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
795 IP6_MAP_IP6_REASS_NEXT_DROP);
798 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
801 map_send_all_to_node (vm, fragments_ready, node,
802 &error_node->errors[MAP_ERROR_NONE],
803 IP6_MAP_IP6_REASS_NEXT_IP6_MAP);
804 map_send_all_to_node (vm, fragments_to_drop, node,
805 &error_node->errors[MAP_ERROR_FRAGMENT_DROPPED],
806 IP6_MAP_IP6_REASS_NEXT_DROP);
808 vec_free (fragments_to_drop);
809 vec_free (fragments_ready);
810 return frame->n_vectors;
817 ip6_map_ip4_reass (vlib_main_t * vm,
818 vlib_node_runtime_t * node, vlib_frame_t * frame)
820 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
821 vlib_node_runtime_t *error_node =
822 vlib_node_get_runtime (vm, ip6_map_ip4_reass_node.index);
823 map_main_t *mm = &map_main;
824 vlib_combined_counter_main_t *cm = mm->domain_counters;
825 u32 thread_index = vm->thread_index;
826 u32 *fragments_to_drop = NULL;
827 u32 *fragments_to_loopback = NULL;
829 from = vlib_frame_vector_args (frame);
830 n_left_from = frame->n_vectors;
831 next_index = node->cached_next_index;
832 while (n_left_from > 0)
834 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
837 while (n_left_from > 0 && n_left_to_next > 0)
841 u8 error0 = MAP_ERROR_NONE;
846 u32 map_domain_index0 = ~0;
847 u32 next0 = IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP;
850 pi0 = to_next[0] = from[0];
856 p0 = vlib_get_buffer (vm, pi0);
857 ip40 = vlib_buffer_get_current (p0);
858 ip60 = ((ip6_header_t *) ip40) - 1;
861 ip6_map_get_domain (vnet_buffer (p0)->ip.adj_index[VLIB_TX],
862 (ip4_address_t *) & ip40->src_address.as_u32,
863 &map_domain_index0, &error0);
865 map_ip4_reass_lock ();
866 //This node only deals with fragmented ip4
867 map_ip4_reass_t *r = map_ip4_reass_get (ip40->src_address.as_u32,
868 ip40->dst_address.as_u32,
872 if (PREDICT_FALSE (!r))
874 // Could not create a caching entry
875 error0 = MAP_ERROR_FRAGMENT_MEMORY;
877 else if (PREDICT_TRUE (ip4_get_fragment_offset (ip40)))
879 // This is a fragment
882 // We know the port already
885 else if (map_ip4_reass_add_fragment (r, pi0))
887 // Not enough space for caching
888 error0 = MAP_ERROR_FRAGMENT_MEMORY;
889 map_ip4_reass_free (r, &fragments_to_drop);
896 else if ((port0 = ip4_get_port (ip40, 1)) == 0)
898 // Could not find port from first fragment. Stop reassembling.
899 error0 = MAP_ERROR_BAD_PROTOCOL;
901 map_ip4_reass_free (r, &fragments_to_drop);
905 // Found port. Remember it and loopback saved fragments
907 map_ip4_reass_get_fragments (r, &fragments_to_loopback);
910 #ifdef MAP_IP4_REASS_COUNT_BYTES
913 r->forwarded += clib_host_to_net_u16 (ip40->length) - 20;
914 if (!ip4_get_fragment_more (ip40))
916 ip4_get_fragment_offset (ip40) * 8 +
917 clib_host_to_net_u16 (ip40->length) - 20;
918 if (r->forwarded >= r->expected_total)
919 map_ip4_reass_free (r, &fragments_to_drop);
923 map_ip4_reass_unlock ();
925 if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
927 ip6_map_sec_check (d0, port0, ip40,
928 ip60) ? MAP_ERROR_NONE :
929 MAP_ERROR_DECAP_SEC_CHECK;
932 (d0->mtu && (clib_host_to_net_u16 (ip40->length) > d0->mtu)
933 && error0 == MAP_ERROR_NONE && !cached))
935 vnet_buffer (p0)->ip_frag.flags = 0;
936 vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
937 vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
938 next0 = IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT;
941 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
943 map_ip6_map_ip4_reass_trace_t *tr =
944 vlib_add_trace (vm, node, p0, sizeof (*tr));
945 tr->map_domain_index = map_domain_index0;
958 if (error0 == MAP_ERROR_NONE)
959 vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_RX,
961 map_domain_index0, 1,
966 MAP_ERROR_NONE) ? next0 : IP6_MAP_IP4_REASS_NEXT_DROP;
967 p0->error = error_node->errors[error0];
968 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
969 n_left_to_next, pi0, next0);
972 //Loopback when we reach the end of the inpu vector
973 if (n_left_from == 0 && vec_len (fragments_to_loopback))
975 from = vlib_frame_vector_args (frame);
976 u32 len = vec_len (fragments_to_loopback);
977 if (len <= VLIB_FRAME_SIZE)
979 clib_memcpy (from, fragments_to_loopback,
982 vec_reset_length (fragments_to_loopback);
987 fragments_to_loopback + (len -
989 sizeof (u32) * VLIB_FRAME_SIZE);
990 n_left_from = VLIB_FRAME_SIZE;
991 _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
995 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
997 map_send_all_to_node (vm, fragments_to_drop, node,
998 &error_node->errors[MAP_ERROR_FRAGMENT_DROPPED],
999 IP6_MAP_IP4_REASS_NEXT_DROP);
1001 vec_free (fragments_to_drop);
1002 vec_free (fragments_to_loopback);
1003 return frame->n_vectors;
1010 ip6_map_icmp_relay (vlib_main_t * vm,
1011 vlib_node_runtime_t * node, vlib_frame_t * frame)
1013 u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
1014 vlib_node_runtime_t *error_node =
1015 vlib_node_get_runtime (vm, ip6_map_icmp_relay_node.index);
1016 map_main_t *mm = &map_main;
1017 u32 thread_index = vm->thread_index;
1018 u16 *fragment_ids, *fid;
1020 from = vlib_frame_vector_args (frame);
1021 n_left_from = frame->n_vectors;
1022 next_index = node->cached_next_index;
1024 /* Get random fragment IDs for replies. */
1025 fid = fragment_ids =
1026 clib_random_buffer_get_data (&vm->random_buffer,
1027 n_left_from * sizeof (fragment_ids[0]));
1029 while (n_left_from > 0)
1031 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1034 while (n_left_from > 0 && n_left_to_next > 0)
1038 u8 error0 = MAP_ERROR_NONE;
1040 u32 next0 = IP6_ICMP_RELAY_NEXT_IP4_LOOKUP;
1043 pi0 = to_next[0] = from[0];
1047 n_left_to_next -= 1;
1049 p0 = vlib_get_buffer (vm, pi0);
1050 ip60 = vlib_buffer_get_current (p0);
1051 u16 tlen = clib_net_to_host_u16 (ip60->payload_length);
1058 * Original IPv4 header / packet
1062 * Original IPv4 header / packet
1065 /* Need at least ICMP(8) + IPv6(40) + IPv4(20) + L4 header(8) */
1068 error0 = MAP_ERROR_ICMP_RELAY;
1072 icmp46_header_t *icmp60 = (icmp46_header_t *) (ip60 + 1);
1073 ip6_header_t *inner_ip60 = (ip6_header_t *) (icmp60 + 2);
1075 if (inner_ip60->protocol != IP_PROTOCOL_IP_IN_IP)
1077 error0 = MAP_ERROR_ICMP_RELAY;
1081 ip4_header_t *inner_ip40 = (ip4_header_t *) (inner_ip60 + 1);
1082 vlib_buffer_advance (p0, 60); /* sizeof ( IPv6 + ICMP + IPv6 - IPv4 - ICMP ) */
1083 ip4_header_t *new_ip40 = vlib_buffer_get_current (p0);
1084 icmp46_header_t *new_icmp40 = (icmp46_header_t *) (new_ip40 + 1);
1087 * Relay according to RFC2473, section 8.3
1089 switch (icmp60->type)
1091 case ICMP6_destination_unreachable:
1092 case ICMP6_time_exceeded:
1093 case ICMP6_parameter_problem:
1094 /* Type 3 - destination unreachable, Code 1 - host unreachable */
1095 new_icmp40->type = ICMP4_destination_unreachable;
1097 ICMP4_destination_unreachable_destination_unreachable_host;
1100 case ICMP6_packet_too_big:
1101 /* Type 3 - destination unreachable, Code 4 - packet too big */
1102 /* Potential TODO: Adjust domain tunnel MTU based on the value received here */
1103 mtu = clib_net_to_host_u32 (*((u32 *) (icmp60 + 1)));
1107 (inner_ip40->flags_and_fragment_offset &
1108 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT)))
1110 error0 = MAP_ERROR_ICMP_RELAY;
1114 new_icmp40->type = ICMP4_destination_unreachable;
1116 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set;
1117 *((u32 *) (new_icmp40 + 1)) =
1118 clib_host_to_net_u32 (mtu < 1280 ? 1280 : mtu);
1122 error0 = MAP_ERROR_ICMP_RELAY;
1127 * Ensure the total ICMP packet is no longer than 576 bytes (RFC1812)
1129 new_ip40->ip_version_and_header_length = 0x45;
1131 u16 nlen = (tlen - 20) > 576 ? 576 : tlen - 20;
1132 new_ip40->length = clib_host_to_net_u16 (nlen);
1133 new_ip40->fragment_id = fid[0];
1136 new_ip40->protocol = IP_PROTOCOL_ICMP;
1137 new_ip40->src_address = mm->icmp4_src_address;
1138 new_ip40->dst_address = inner_ip40->src_address;
1139 new_ip40->checksum = ip4_header_checksum (new_ip40);
1141 new_icmp40->checksum = 0;
1142 ip_csum_t sum = ip_incremental_checksum (0, new_icmp40, nlen - 20);
1143 new_icmp40->checksum = ~ip_csum_fold (sum);
1145 vlib_increment_simple_counter (&mm->icmp_relayed, thread_index, 0,
1149 if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
1151 map_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
1152 tr->map_domain_index = 0;
1157 (error0 == MAP_ERROR_NONE) ? next0 : IP6_ICMP_RELAY_NEXT_DROP;
1158 p0->error = error_node->errors[error0];
1159 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1160 n_left_to_next, pi0, next0);
1162 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1165 return frame->n_vectors;
1169 static char *map_error_strings[] = {
1170 #define _(sym,string) string,
1176 VLIB_REGISTER_NODE(ip6_map_node) = {
1177 .function = ip6_map,
1179 .vector_size = sizeof(u32),
1180 .format_trace = format_map_trace,
1181 .type = VLIB_NODE_TYPE_INTERNAL,
1183 .n_errors = MAP_N_ERROR,
1184 .error_strings = map_error_strings,
1186 .n_next_nodes = IP6_MAP_N_NEXT,
1188 [IP6_MAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
1189 #ifdef MAP_SKIP_IP6_LOOKUP
1190 [IP6_MAP_NEXT_IP4_REWRITE] = "ip4-load-balance",
1192 [IP6_MAP_NEXT_IP6_REASS] = "ip6-map-ip6-reass",
1193 [IP6_MAP_NEXT_IP4_REASS] = "ip6-map-ip4-reass",
1194 [IP6_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag",
1195 [IP6_MAP_NEXT_IP6_ICMP_RELAY] = "ip6-map-icmp-relay",
1196 [IP6_MAP_NEXT_IP6_LOCAL] = "ip6-local",
1197 [IP6_MAP_NEXT_DROP] = "error-drop",
1198 [IP6_MAP_NEXT_ICMP] = "ip6-icmp-error",
1204 VLIB_REGISTER_NODE(ip6_map_ip6_reass_node) = {
1205 .function = ip6_map_ip6_reass,
1206 .name = "ip6-map-ip6-reass",
1207 .vector_size = sizeof(u32),
1208 .format_trace = format_ip6_map_ip6_reass_trace,
1209 .type = VLIB_NODE_TYPE_INTERNAL,
1210 .n_errors = MAP_N_ERROR,
1211 .error_strings = map_error_strings,
1212 .n_next_nodes = IP6_MAP_IP6_REASS_N_NEXT,
1214 [IP6_MAP_IP6_REASS_NEXT_IP6_MAP] = "ip6-map",
1215 [IP6_MAP_IP6_REASS_NEXT_DROP] = "error-drop",
1221 VLIB_REGISTER_NODE(ip6_map_ip4_reass_node) = {
1222 .function = ip6_map_ip4_reass,
1223 .name = "ip6-map-ip4-reass",
1224 .vector_size = sizeof(u32),
1225 .format_trace = format_ip6_map_ip4_reass_trace,
1226 .type = VLIB_NODE_TYPE_INTERNAL,
1227 .n_errors = MAP_N_ERROR,
1228 .error_strings = map_error_strings,
1229 .n_next_nodes = IP6_MAP_IP4_REASS_N_NEXT,
1231 [IP6_MAP_IP4_REASS_NEXT_IP4_LOOKUP] = "ip4-lookup",
1232 [IP6_MAP_IP4_REASS_NEXT_IP4_FRAGMENT] = "ip4-frag",
1233 [IP6_MAP_IP4_REASS_NEXT_DROP] = "error-drop",
1239 VLIB_REGISTER_NODE(ip6_map_icmp_relay_node, static) = {
1240 .function = ip6_map_icmp_relay,
1241 .name = "ip6-map-icmp-relay",
1242 .vector_size = sizeof(u32),
1243 .format_trace = format_map_trace, //FIXME
1244 .type = VLIB_NODE_TYPE_INTERNAL,
1245 .n_errors = MAP_N_ERROR,
1246 .error_strings = map_error_strings,
1247 .n_next_nodes = IP6_ICMP_RELAY_N_NEXT,
1249 [IP6_ICMP_RELAY_NEXT_IP4_LOOKUP] = "ip4-lookup",
1250 [IP6_ICMP_RELAY_NEXT_DROP] = "error-drop",
1256 * fd.io coding-style-patch-verification: ON
1259 * eval: (c-set-style "gnu")