2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/ip4_forward.c: IP v4 forwarding
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/vnet.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
43 #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
44 #include <vnet/ppp/ppp.h>
45 #include <vnet/srp/srp.h> /* for srp_hw_interface_class */
46 #include <vnet/api_errno.h> /* for API error numbers */
48 /* This is really, really simple but stupid fib. */
50 ip4_fib_lookup_with_table (ip4_main_t * im, u32 fib_index,
52 u32 disable_default_route)
54 ip_lookup_main_t * lm = &im->lookup_main;
55 ip4_fib_t * fib = vec_elt_at_index (im->fibs, fib_index);
56 uword * p, * hash, key;
57 i32 i, i_min, dst_address, ai;
59 i_min = disable_default_route ? 1 : 0;
60 dst_address = clib_mem_unaligned (&dst->data_u32, u32);
61 for (i = ARRAY_LEN (fib->adj_index_by_dst_address) - 1; i >= i_min; i--)
63 hash = fib->adj_index_by_dst_address[i];
67 key = dst_address & im->fib_masks[i];
68 if ((p = hash_get (hash, key)) != 0)
75 /* Nothing matches in table. */
76 ai = lm->miss_adj_index;
83 create_fib_with_table_id (ip4_main_t * im, u32 table_id)
86 hash_set (im->fib_index_by_table_id, table_id, vec_len (im->fibs));
87 vec_add2 (im->fibs, fib, 1);
88 fib->table_id = table_id;
89 fib->index = fib - im->fibs;
90 fib->flow_hash_config = IP_FLOW_HASH_DEFAULT;
91 fib->fwd_classify_table_index = ~0;
92 fib->rev_classify_table_index = ~0;
93 ip4_mtrie_init (&fib->mtrie);
98 find_ip4_fib_by_table_index_or_id (ip4_main_t * im,
99 u32 table_index_or_id, u32 flags)
101 uword * p, fib_index;
103 fib_index = table_index_or_id;
104 if (! (flags & IP4_ROUTE_FLAG_FIB_INDEX))
106 if (table_index_or_id == ~0) {
107 table_index_or_id = 0;
108 while ((p = hash_get (im->fib_index_by_table_id, table_index_or_id))) {
111 return create_fib_with_table_id (im, table_index_or_id);
114 p = hash_get (im->fib_index_by_table_id, table_index_or_id);
116 return create_fib_with_table_id (im, table_index_or_id);
119 return vec_elt_at_index (im->fibs, fib_index);
123 ip4_fib_init_adj_index_by_dst_address (ip_lookup_main_t * lm,
130 ASSERT (lm->fib_result_n_bytes >= sizeof (uword));
131 lm->fib_result_n_words = round_pow2 (lm->fib_result_n_bytes, sizeof (uword)) / sizeof (uword);
133 fib->adj_index_by_dst_address[address_length] =
134 hash_create (32 /* elts */, lm->fib_result_n_words * sizeof (uword));
136 hash_set_flags (fib->adj_index_by_dst_address[address_length],
137 HASH_FLAG_NO_AUTO_SHRINK);
139 h = hash_header (fib->adj_index_by_dst_address[address_length]);
140 max_index = (hash_value_bytes (h) / sizeof (fib->new_hash_values[0])) - 1;
142 /* Initialize new/old hash value vectors. */
143 vec_validate_init_empty (fib->new_hash_values, max_index, ~0);
144 vec_validate_init_empty (fib->old_hash_values, max_index, ~0);
148 ip4_fib_set_adj_index (ip4_main_t * im,
152 u32 dst_address_length,
155 ip_lookup_main_t * lm = &im->lookup_main;
158 if (vec_bytes(fib->old_hash_values))
159 memset (fib->old_hash_values, ~0, vec_bytes (fib->old_hash_values));
160 if (vec_bytes(fib->new_hash_values))
161 memset (fib->new_hash_values, ~0, vec_bytes (fib->new_hash_values));
162 fib->new_hash_values[0] = adj_index;
164 /* Make sure adj index is valid. */
166 (void) ip_get_adjacency (lm, adj_index);
168 hash = fib->adj_index_by_dst_address[dst_address_length];
170 hash = _hash_set3 (hash, dst_address_u32,
171 fib->new_hash_values,
172 fib->old_hash_values);
174 fib->adj_index_by_dst_address[dst_address_length] = hash;
176 if (vec_len (im->add_del_route_callbacks) > 0)
178 ip4_add_del_route_callback_t * cb;
182 d.data_u32 = dst_address_u32;
183 vec_foreach (cb, im->add_del_route_callbacks)
184 if ((flags & cb->required_flags) == cb->required_flags)
185 cb->function (im, cb->function_opaque,
187 &d, dst_address_length,
188 fib->old_hash_values,
189 fib->new_hash_values);
191 p = hash_get (hash, dst_address_u32);
192 clib_memcpy (p, fib->new_hash_values, vec_bytes (fib->new_hash_values));
196 void ip4_add_del_route (ip4_main_t * im, ip4_add_del_route_args_t * a)
198 ip_lookup_main_t * lm = &im->lookup_main;
200 u32 dst_address, dst_address_length, adj_index, old_adj_index;
201 uword * hash, is_del;
202 ip4_add_del_route_callback_t * cb;
204 /* Either create new adjacency or use given one depending on arguments. */
205 if (a->n_add_adj > 0)
207 ip_add_adjacency (lm, a->add_adj, a->n_add_adj, &adj_index);
208 ip_call_add_del_adjacency_callbacks (lm, adj_index, /* is_del */ 0);
211 adj_index = a->adj_index;
213 dst_address = a->dst_address.data_u32;
214 dst_address_length = a->dst_address_length;
215 fib = find_ip4_fib_by_table_index_or_id (im, a->table_index_or_table_id, a->flags);
217 ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
218 dst_address &= im->fib_masks[dst_address_length];
220 if (! fib->adj_index_by_dst_address[dst_address_length])
221 ip4_fib_init_adj_index_by_dst_address (lm, fib, dst_address_length);
223 hash = fib->adj_index_by_dst_address[dst_address_length];
225 is_del = (a->flags & IP4_ROUTE_FLAG_DEL) != 0;
229 fib->old_hash_values[0] = ~0;
230 hash = _hash_unset (hash, dst_address, fib->old_hash_values);
231 fib->adj_index_by_dst_address[dst_address_length] = hash;
233 if (vec_len (im->add_del_route_callbacks) > 0
234 && fib->old_hash_values[0] != ~0) /* make sure destination was found in hash */
236 fib->new_hash_values[0] = ~0;
237 vec_foreach (cb, im->add_del_route_callbacks)
238 if ((a->flags & cb->required_flags) == cb->required_flags)
239 cb->function (im, cb->function_opaque,
241 &a->dst_address, dst_address_length,
242 fib->old_hash_values,
243 fib->new_hash_values);
247 ip4_fib_set_adj_index (im, fib, a->flags, dst_address, dst_address_length,
250 old_adj_index = fib->old_hash_values[0];
252 /* Avoid spurious reference count increments */
253 if (old_adj_index == adj_index
255 && !(a->flags & IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY))
257 ip_adjacency_t * adj = ip_get_adjacency (lm, adj_index);
258 if (adj->share_count > 0)
262 ip4_fib_mtrie_add_del_route (fib, a->dst_address, dst_address_length,
263 is_del ? old_adj_index : adj_index,
266 /* Delete old adjacency index if present and changed. */
267 if (! (a->flags & IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY)
268 && old_adj_index != ~0
269 && old_adj_index != adj_index)
270 ip_del_adjacency (lm, old_adj_index);
274 ip4_add_del_route_next_hop (ip4_main_t * im,
276 ip4_address_t * dst_address,
277 u32 dst_address_length,
278 ip4_address_t * next_hop,
279 u32 next_hop_sw_if_index,
280 u32 next_hop_weight, u32 adj_index,
281 u32 explicit_fib_index)
283 vnet_main_t * vnm = vnet_get_main();
284 ip_lookup_main_t * lm = &im->lookup_main;
287 u32 dst_address_u32, old_mp_adj_index, new_mp_adj_index;
288 u32 dst_adj_index, nh_adj_index;
289 uword * dst_hash, * dst_result;
290 uword * nh_hash, * nh_result;
291 ip_adjacency_t * dst_adj;
292 ip_multipath_adjacency_t * old_mp, * new_mp;
293 int is_del = (flags & IP4_ROUTE_FLAG_DEL) != 0;
294 int is_interface_next_hop;
295 clib_error_t * error = 0;
297 if (explicit_fib_index == (u32)~0)
298 fib_index = vec_elt (im->fib_index_by_sw_if_index, next_hop_sw_if_index);
300 fib_index = explicit_fib_index;
302 fib = vec_elt_at_index (im->fibs, fib_index);
304 /* Lookup next hop to be added or deleted. */
305 is_interface_next_hop = next_hop->data_u32 == 0;
306 if (adj_index == (u32)~0)
308 if (is_interface_next_hop)
310 nh_result = hash_get (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index);
312 nh_adj_index = *nh_result;
315 ip_adjacency_t * adj;
316 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
318 ip4_adjacency_set_interface_route (vnm, adj, next_hop_sw_if_index, /* if_address_index */ ~0);
319 ip_call_add_del_adjacency_callbacks (lm, nh_adj_index, /* is_del */ 0);
320 hash_set (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index, nh_adj_index);
325 nh_hash = fib->adj_index_by_dst_address[32];
326 nh_result = hash_get (nh_hash, next_hop->data_u32);
328 /* Next hop must be known. */
331 ip_adjacency_t * adj;
333 nh_adj_index = ip4_fib_lookup_with_table (im, fib_index,
335 adj = ip_get_adjacency (lm, nh_adj_index);
336 /* if ARP interface adjacencty is present, we need to
337 install ARP adjaceny for specific next hop */
338 if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
339 adj->arp.next_hop.ip4.as_u32 == 0)
341 nh_adj_index = vnet_arp_glean_add(fib_index, next_hop);
345 /* Next hop is not known, so create indirect adj */
346 ip_adjacency_t add_adj;
347 memset (&add_adj, 0, sizeof(add_adj));
349 add_adj.lookup_next_index = IP_LOOKUP_NEXT_INDIRECT;
350 add_adj.indirect.next_hop.ip4.as_u32 = next_hop->as_u32;
351 add_adj.explicit_fib_index = explicit_fib_index;
352 ip_add_adjacency (lm, &add_adj, 1, &nh_adj_index);
356 nh_adj_index = *nh_result;
361 nh_adj_index = adj_index;
363 ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
364 dst_address_u32 = dst_address->data_u32 & im->fib_masks[dst_address_length];
366 dst_hash = fib->adj_index_by_dst_address[dst_address_length];
367 dst_result = hash_get (dst_hash, dst_address_u32);
370 dst_adj_index = dst_result[0];
371 dst_adj = ip_get_adjacency (lm, dst_adj_index);
375 /* For deletes destination must be known. */
378 vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
379 error = clib_error_return (0, "unknown destination %U/%d",
380 format_ip4_address, dst_address,
389 /* Ignore adds of X/32 with next hop of X. */
391 && dst_address_length == 32
392 && dst_address->data_u32 == next_hop->data_u32
393 && adj_index != (u32)~0)
395 vnm->api_errno = VNET_API_ERROR_PREFIX_MATCHES_NEXT_HOP;
396 error = clib_error_return (0, "prefix matches next hop %U/%d",
397 format_ip4_address, dst_address,
402 /* Destination is not known and default weight is set so add route
403 to existing non-multipath adjacency */
404 if (dst_adj_index == ~0 && next_hop_weight == 1 && next_hop_sw_if_index == ~0)
406 /* create new adjacency */
407 ip4_add_del_route_args_t a;
408 a.table_index_or_table_id = fib_index;
409 a.flags = ((is_del ? IP4_ROUTE_FLAG_DEL : IP4_ROUTE_FLAG_ADD)
410 | IP4_ROUTE_FLAG_FIB_INDEX
411 | IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY
412 | (flags & (IP4_ROUTE_FLAG_NO_REDISTRIBUTE
413 | IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
414 a.dst_address = dst_address[0];
415 a.dst_address_length = dst_address_length;
416 a.adj_index = nh_adj_index;
420 ip4_add_del_route (im, &a);
425 old_mp_adj_index = dst_adj ? dst_adj->heap_handle : ~0;
427 if (! ip_multipath_adjacency_add_del_next_hop
434 vnm->api_errno = VNET_API_ERROR_NEXT_HOP_NOT_FOUND_MP;
435 error = clib_error_return (0, "requested deleting next-hop %U not found in multi-path",
436 format_ip4_address, next_hop);
441 if (old_mp_adj_index != ~0)
442 old_mp = vec_elt_at_index (lm->multipath_adjacencies, old_mp_adj_index);
443 if (new_mp_adj_index != ~0)
444 new_mp = vec_elt_at_index (lm->multipath_adjacencies, new_mp_adj_index);
446 if (old_mp != new_mp)
448 ip4_add_del_route_args_t a;
449 a.table_index_or_table_id = fib_index;
450 a.flags = ((is_del && ! new_mp ? IP4_ROUTE_FLAG_DEL : IP4_ROUTE_FLAG_ADD)
451 | IP4_ROUTE_FLAG_FIB_INDEX
452 | IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY
453 | (flags & (IP4_ROUTE_FLAG_NO_REDISTRIBUTE | IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
454 a.dst_address = dst_address[0];
455 a.dst_address_length = dst_address_length;
456 a.adj_index = new_mp ? new_mp->adj_index : dst_adj_index;
460 ip4_add_del_route (im, &a);
465 clib_error_report (error);
469 ip4_get_route (ip4_main_t * im,
470 u32 table_index_or_table_id,
475 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
476 u32 dst_address = * (u32 *) address;
479 ASSERT (address_length < ARRAY_LEN (im->fib_masks));
480 dst_address &= im->fib_masks[address_length];
482 hash = fib->adj_index_by_dst_address[address_length];
483 p = hash_get (hash, dst_address);
488 ip4_foreach_matching_route (ip4_main_t * im,
489 u32 table_index_or_table_id,
491 ip4_address_t * address,
493 ip4_address_t ** results,
494 u8 ** result_lengths)
496 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
497 u32 dst_address = address->data_u32;
498 u32 this_length = address_length;
501 _vec_len (*results) = 0;
503 _vec_len (*result_lengths) = 0;
505 while (this_length <= 32 && vec_len (results) == 0)
508 hash_foreach (k, v, fib->adj_index_by_dst_address[this_length], ({
509 if (0 == ((k ^ dst_address) & im->fib_masks[address_length]))
513 vec_add1 (*results, a);
514 vec_add1 (*result_lengths, this_length);
522 void ip4_maybe_remap_adjacencies (ip4_main_t * im,
523 u32 table_index_or_table_id,
526 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
527 ip_lookup_main_t * lm = &im->lookup_main;
530 ip4_add_del_route_callback_t * cb;
531 static ip4_address_t * to_delete;
533 if (lm->n_adjacency_remaps == 0)
536 for (l = 0; l <= 32; l++)
539 uword * hash = fib->adj_index_by_dst_address[l];
541 if (hash_elts (hash) == 0)
545 _vec_len (to_delete) = 0;
547 hash_foreach_pair (p, hash, ({
548 u32 adj_index = p->value[0];
549 u32 m = vec_elt (lm->adjacency_remap_table, adj_index);
553 /* Record destination address from hash key. */
556 /* New adjacency points to nothing: so delete prefix. */
558 vec_add1 (to_delete, a);
561 /* Remap to new adjacency. */
562 clib_memcpy (fib->old_hash_values, p->value, vec_bytes (fib->old_hash_values));
564 /* Set new adjacency value. */
565 fib->new_hash_values[0] = p->value[0] = m - 1;
567 vec_foreach (cb, im->add_del_route_callbacks)
568 if ((flags & cb->required_flags) == cb->required_flags)
569 cb->function (im, cb->function_opaque,
570 fib, flags | IP4_ROUTE_FLAG_ADD,
572 fib->old_hash_values,
573 fib->new_hash_values);
578 fib->new_hash_values[0] = ~0;
579 for (i = 0; i < vec_len (to_delete); i++)
581 hash = _hash_unset (hash, to_delete[i].data_u32, fib->old_hash_values);
582 vec_foreach (cb, im->add_del_route_callbacks)
583 if ((flags & cb->required_flags) == cb->required_flags)
584 cb->function (im, cb->function_opaque,
585 fib, flags | IP4_ROUTE_FLAG_DEL,
587 fib->old_hash_values,
588 fib->new_hash_values);
592 /* Also remap adjacencies in mtrie. */
593 ip4_mtrie_maybe_remap_adjacencies (lm, &fib->mtrie);
595 /* Reset mapping table. */
596 vec_zero (lm->adjacency_remap_table);
598 /* All remaps have been performed. */
599 lm->n_adjacency_remaps = 0;
602 void ip4_delete_matching_routes (ip4_main_t * im,
603 u32 table_index_or_table_id,
605 ip4_address_t * address,
608 static ip4_address_t * matching_addresses;
609 static u8 * matching_address_lengths;
611 ip4_add_del_route_args_t a;
613 a.flags = IP4_ROUTE_FLAG_DEL | IP4_ROUTE_FLAG_NO_REDISTRIBUTE | flags;
614 a.table_index_or_table_id = table_index_or_table_id;
619 for (l = address_length + 1; l <= 32; l++)
621 ip4_foreach_matching_route (im, table_index_or_table_id, flags,
625 &matching_address_lengths);
626 for (i = 0; i < vec_len (matching_addresses); i++)
628 a.dst_address = matching_addresses[i];
629 a.dst_address_length = matching_address_lengths[i];
630 ip4_add_del_route (im, &a);
634 ip4_maybe_remap_adjacencies (im, table_index_or_table_id, flags);
638 ip4_forward_next_trace (vlib_main_t * vm,
639 vlib_node_runtime_t * node,
640 vlib_frame_t * frame,
641 vlib_rx_or_tx_t which_adj_index);
644 ip4_lookup_inline (vlib_main_t * vm,
645 vlib_node_runtime_t * node,
646 vlib_frame_t * frame,
647 int lookup_for_responses_to_locally_received_packets,
650 ip4_main_t * im = &ip4_main;
651 ip_lookup_main_t * lm = &im->lookup_main;
652 vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
653 u32 n_left_from, n_left_to_next, * from, * to_next;
654 ip_lookup_next_t next;
655 u32 cpu_index = os_get_cpu_number();
657 from = vlib_frame_vector_args (frame);
658 n_left_from = frame->n_vectors;
659 next = node->cached_next_index;
661 while (n_left_from > 0)
663 vlib_get_next_frame (vm, node, next,
664 to_next, n_left_to_next);
666 while (n_left_from >= 4 && n_left_to_next >= 2)
668 vlib_buffer_t * p0, * p1;
669 ip4_header_t * ip0, * ip1;
670 __attribute__((unused)) tcp_header_t * tcp0, * tcp1;
671 ip_lookup_next_t next0, next1;
672 ip_adjacency_t * adj0, * adj1;
673 ip4_fib_mtrie_t * mtrie0, * mtrie1;
674 ip4_fib_mtrie_leaf_t leaf0, leaf1;
675 ip4_address_t * dst_addr0, *dst_addr1;
676 __attribute__((unused)) u32 pi0, fib_index0, adj_index0, is_tcp_udp0;
677 __attribute__((unused)) u32 pi1, fib_index1, adj_index1, is_tcp_udp1;
678 u32 flow_hash_config0, flow_hash_config1;
679 u32 hash_c0, hash_c1;
682 /* Prefetch next iteration. */
684 vlib_buffer_t * p2, * p3;
686 p2 = vlib_get_buffer (vm, from[2]);
687 p3 = vlib_get_buffer (vm, from[3]);
689 vlib_prefetch_buffer_header (p2, LOAD);
690 vlib_prefetch_buffer_header (p3, LOAD);
692 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
693 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
696 pi0 = to_next[0] = from[0];
697 pi1 = to_next[1] = from[1];
699 p0 = vlib_get_buffer (vm, pi0);
700 p1 = vlib_get_buffer (vm, pi1);
702 ip0 = vlib_buffer_get_current (p0);
703 ip1 = vlib_buffer_get_current (p1);
707 ip_adjacency_t * iadj0, * iadj1;
708 iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
709 iadj1 = ip_get_adjacency (lm, vnet_buffer(p1)->ip.adj_index[VLIB_TX]);
710 dst_addr0 = &iadj0->indirect.next_hop.ip4;
711 dst_addr1 = &iadj1->indirect.next_hop.ip4;
715 dst_addr0 = &ip0->dst_address;
716 dst_addr1 = &ip1->dst_address;
719 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
720 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
721 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
722 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
723 fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
724 fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
727 if (! lookup_for_responses_to_locally_received_packets)
729 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
730 mtrie1 = &vec_elt_at_index (im->fibs, fib_index1)->mtrie;
732 leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
734 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 0);
735 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 0);
738 tcp0 = (void *) (ip0 + 1);
739 tcp1 = (void *) (ip1 + 1);
741 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
742 || ip0->protocol == IP_PROTOCOL_UDP);
743 is_tcp_udp1 = (ip1->protocol == IP_PROTOCOL_TCP
744 || ip1->protocol == IP_PROTOCOL_UDP);
746 if (! lookup_for_responses_to_locally_received_packets)
748 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
749 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 1);
752 if (! lookup_for_responses_to_locally_received_packets)
754 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
755 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
758 if (! lookup_for_responses_to_locally_received_packets)
760 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
761 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
764 if (lookup_for_responses_to_locally_received_packets)
766 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
767 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
771 /* Handle default route. */
772 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
773 leaf1 = (leaf1 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie1->default_leaf : leaf1);
775 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
776 adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
779 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
781 /* no_default_route */ 0));
782 ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, fib_index1,
784 /* no_default_route */ 0));
785 adj0 = ip_get_adjacency (lm, adj_index0);
786 adj1 = ip_get_adjacency (lm, adj_index1);
788 next0 = adj0->lookup_next_index;
789 next1 = adj1->lookup_next_index;
791 /* Use flow hash to compute multipath adjacency. */
792 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
793 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
794 if (PREDICT_FALSE (adj0->n_adj > 1))
797 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
798 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
799 ip4_compute_flow_hash (ip0, flow_hash_config0);
801 if (PREDICT_FALSE(adj1->n_adj > 1))
804 vec_elt_at_index (im->fibs, fib_index1)->flow_hash_config;
805 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
806 ip4_compute_flow_hash (ip1, flow_hash_config1);
809 ASSERT (adj0->n_adj > 0);
810 ASSERT (adj1->n_adj > 0);
811 ASSERT (is_pow2 (adj0->n_adj));
812 ASSERT (is_pow2 (adj1->n_adj));
813 adj_index0 += (hash_c0 & (adj0->n_adj - 1));
814 adj_index1 += (hash_c1 & (adj1->n_adj - 1));
816 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
817 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
819 vlib_increment_combined_counter
820 (cm, cpu_index, adj_index0, 1,
821 vlib_buffer_length_in_chain (vm, p0)
822 + sizeof(ethernet_header_t));
823 vlib_increment_combined_counter
824 (cm, cpu_index, adj_index1, 1,
825 vlib_buffer_length_in_chain (vm, p1)
826 + sizeof(ethernet_header_t));
833 wrong_next = (next0 != next) + 2*(next1 != next);
834 if (PREDICT_FALSE (wrong_next != 0))
843 vlib_set_next_frame_buffer (vm, node, next0, pi0);
850 vlib_set_next_frame_buffer (vm, node, next1, pi1);
857 vlib_set_next_frame_buffer (vm, node, next0, pi0);
858 vlib_set_next_frame_buffer (vm, node, next1, pi1);
862 vlib_put_next_frame (vm, node, next, n_left_to_next);
864 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
870 while (n_left_from > 0 && n_left_to_next > 0)
874 __attribute__((unused)) tcp_header_t * tcp0;
875 ip_lookup_next_t next0;
876 ip_adjacency_t * adj0;
877 ip4_fib_mtrie_t * mtrie0;
878 ip4_fib_mtrie_leaf_t leaf0;
879 ip4_address_t * dst_addr0;
880 __attribute__((unused)) u32 pi0, fib_index0, adj_index0, is_tcp_udp0;
881 u32 flow_hash_config0, hash_c0;
886 p0 = vlib_get_buffer (vm, pi0);
888 ip0 = vlib_buffer_get_current (p0);
892 ip_adjacency_t * iadj0;
893 iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
894 dst_addr0 = &iadj0->indirect.next_hop.ip4;
898 dst_addr0 = &ip0->dst_address;
901 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
902 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
903 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
905 if (! lookup_for_responses_to_locally_received_packets)
907 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
909 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
911 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 0);
914 tcp0 = (void *) (ip0 + 1);
916 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
917 || ip0->protocol == IP_PROTOCOL_UDP);
919 if (! lookup_for_responses_to_locally_received_packets)
920 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
922 if (! lookup_for_responses_to_locally_received_packets)
923 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
925 if (! lookup_for_responses_to_locally_received_packets)
926 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
928 if (lookup_for_responses_to_locally_received_packets)
929 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
932 /* Handle default route. */
933 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
934 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
937 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
939 /* no_default_route */ 0));
941 adj0 = ip_get_adjacency (lm, adj_index0);
943 next0 = adj0->lookup_next_index;
945 /* Use flow hash to compute multipath adjacency. */
946 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
947 if (PREDICT_FALSE(adj0->n_adj > 1))
950 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
952 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
953 ip4_compute_flow_hash (ip0, flow_hash_config0);
956 ASSERT (adj0->n_adj > 0);
957 ASSERT (is_pow2 (adj0->n_adj));
958 adj_index0 += (hash_c0 & (adj0->n_adj - 1));
960 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
962 vlib_increment_combined_counter
963 (cm, cpu_index, adj_index0, 1,
964 vlib_buffer_length_in_chain (vm, p0)
965 + sizeof(ethernet_header_t));
972 if (PREDICT_FALSE (next0 != next))
975 vlib_put_next_frame (vm, node, next, n_left_to_next);
977 vlib_get_next_frame (vm, node, next,
978 to_next, n_left_to_next);
985 vlib_put_next_frame (vm, node, next, n_left_to_next);
988 if (node->flags & VLIB_NODE_FLAG_TRACE)
989 ip4_forward_next_trace(vm, node, frame, VLIB_TX);
991 return frame->n_vectors;
995 ip4_lookup (vlib_main_t * vm,
996 vlib_node_runtime_t * node,
997 vlib_frame_t * frame)
999 return ip4_lookup_inline (vm, node, frame,
1000 /* lookup_for_responses_to_locally_received_packets */ 0,
1001 /* is_indirect */ 0);
1005 void ip4_adjacency_set_interface_route (vnet_main_t * vnm,
1006 ip_adjacency_t * adj,
1008 u32 if_address_index)
1010 vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
1012 vnet_l3_packet_type_t packet_type;
1015 if (hw->hw_class_index == ethernet_hw_interface_class.index
1016 || hw->hw_class_index == srp_hw_interface_class.index)
1019 * We have a bit of a problem in this case. ip4-arp uses
1020 * the rewrite_header.next_index to hand pkts to the
1021 * indicated inteface output node. We can end up in
1022 * ip4_rewrite_local, too, which also pays attention to
1023 * rewrite_header.next index. Net result: a hack in
1024 * ip4_rewrite_local...
1026 n = IP_LOOKUP_NEXT_ARP;
1027 node_index = ip4_arp_node.index;
1028 adj->if_address_index = if_address_index;
1029 adj->arp.next_hop.ip4.as_u32 = 0;
1030 ip46_address_reset(&adj->arp.next_hop);
1031 packet_type = VNET_L3_PACKET_TYPE_ARP;
1035 n = IP_LOOKUP_NEXT_REWRITE;
1036 node_index = ip4_rewrite_node.index;
1037 packet_type = VNET_L3_PACKET_TYPE_IP4;
1040 adj->lookup_next_index = n;
1041 vnet_rewrite_for_sw_interface
1046 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST,
1047 &adj->rewrite_header,
1048 sizeof (adj->rewrite_data));
1052 ip4_add_interface_routes (u32 sw_if_index,
1053 ip4_main_t * im, u32 fib_index,
1054 ip_interface_address_t * a)
1056 vnet_main_t * vnm = vnet_get_main();
1057 ip_lookup_main_t * lm = &im->lookup_main;
1058 ip_adjacency_t * adj;
1059 ip4_address_t * address = ip_interface_address_get_address (lm, a);
1060 ip4_add_del_route_args_t x;
1061 vnet_hw_interface_t * hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
1062 u32 classify_table_index;
1064 /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1065 x.table_index_or_table_id = fib_index;
1066 x.flags = (IP4_ROUTE_FLAG_ADD
1067 | IP4_ROUTE_FLAG_FIB_INDEX
1068 | IP4_ROUTE_FLAG_NO_REDISTRIBUTE);
1069 x.dst_address = address[0];
1070 x.dst_address_length = a->address_length;
1074 a->neighbor_probe_adj_index = ~0;
1075 if (a->address_length < 32)
1077 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1079 ip4_adjacency_set_interface_route (vnm, adj, sw_if_index, a - lm->if_address_pool);
1080 ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1081 ip4_add_del_route (im, &x);
1082 a->neighbor_probe_adj_index = x.adj_index;
1085 /* Add e.g. 1.1.1.1/32 as local to this host. */
1086 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1089 classify_table_index = ~0;
1090 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
1091 classify_table_index = lm->classify_table_index_by_sw_if_index [sw_if_index];
1092 if (classify_table_index != (u32) ~0)
1094 adj->lookup_next_index = IP_LOOKUP_NEXT_CLASSIFY;
1095 adj->classify.table_index = classify_table_index;
1098 adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
1100 adj->if_address_index = a - lm->if_address_pool;
1101 adj->rewrite_header.sw_if_index = sw_if_index;
1102 adj->rewrite_header.max_l3_packet_bytes = hw_if->max_l3_packet_bytes[VLIB_RX];
1104 * Local adjs are never to be rewritten. Spoofed pkts w/ src = dst = local
1105 * fail an RPF-ish check, but still go thru the rewrite code...
1107 adj->rewrite_header.data_bytes = 0;
1109 ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1110 x.dst_address_length = 32;
1111 ip4_add_del_route (im, &x);
1115 ip4_del_interface_routes (ip4_main_t * im, u32 fib_index, ip4_address_t * address, u32 address_length)
1117 ip4_add_del_route_args_t x;
1119 /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1120 x.table_index_or_table_id = fib_index;
1121 x.flags = (IP4_ROUTE_FLAG_DEL
1122 | IP4_ROUTE_FLAG_FIB_INDEX
1123 | IP4_ROUTE_FLAG_NO_REDISTRIBUTE);
1124 x.dst_address = address[0];
1125 x.dst_address_length = address_length;
1130 if (address_length < 32)
1131 ip4_add_del_route (im, &x);
1133 x.dst_address_length = 32;
1134 ip4_add_del_route (im, &x);
1136 ip4_delete_matching_routes (im,
1138 IP4_ROUTE_FLAG_FIB_INDEX,
1145 ip4_address_t address;
1147 } ip4_interface_address_t;
1149 static clib_error_t *
1150 ip4_add_del_interface_address_internal (vlib_main_t * vm,
1152 ip4_address_t * new_address,
1158 static clib_error_t *
1159 ip4_add_del_interface_address_internal (vlib_main_t * vm,
1161 ip4_address_t * address,
1167 vnet_main_t * vnm = vnet_get_main();
1168 ip4_main_t * im = &ip4_main;
1169 ip_lookup_main_t * lm = &im->lookup_main;
1170 clib_error_t * error = 0;
1171 u32 if_address_index, elts_before;
1172 ip4_address_fib_t ip4_af, * addr_fib = 0;
1174 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1175 ip4_addr_fib_init (&ip4_af, address,
1176 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
1177 vec_add1 (addr_fib, ip4_af);
1179 /* When adding an address check that it does not conflict with an existing address. */
1182 ip_interface_address_t * ia;
1183 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1184 0 /* honor unnumbered */,
1186 ip4_address_t * x = ip_interface_address_get_address (&im->lookup_main, ia);
1188 if (ip4_destination_matches_route (im, address, x, ia->address_length)
1189 || ip4_destination_matches_route (im, x, address, address_length))
1190 return clib_error_create ("failed to add %U which conflicts with %U for interface %U",
1191 format_ip4_address_and_length, address, address_length,
1192 format_ip4_address_and_length, x, ia->address_length,
1193 format_vnet_sw_if_index_name, vnm, sw_if_index);
1197 elts_before = pool_elts (lm->if_address_pool);
1199 error = ip_interface_address_add_del
1209 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index) && insert_routes)
1212 ip4_del_interface_routes (im, ip4_af.fib_index, address,
1216 ip4_add_interface_routes (sw_if_index,
1217 im, ip4_af.fib_index,
1219 (lm->if_address_pool, if_address_index));
1222 /* If pool did not grow/shrink: add duplicate address. */
1223 if (elts_before != pool_elts (lm->if_address_pool))
1225 ip4_add_del_interface_address_callback_t * cb;
1226 vec_foreach (cb, im->add_del_interface_address_callbacks)
1227 cb->function (im, cb->function_opaque, sw_if_index,
1228 address, address_length,
1234 vec_free (addr_fib);
1239 ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
1240 ip4_address_t * address, u32 address_length,
1243 return ip4_add_del_interface_address_internal
1244 (vm, sw_if_index, address, address_length,
1245 /* redistribute */ 1,
1246 /* insert_routes */ 1,
1250 static clib_error_t *
1251 ip4_sw_interface_admin_up_down (vnet_main_t * vnm,
1255 ip4_main_t * im = &ip4_main;
1256 ip_interface_address_t * ia;
1258 u32 is_admin_up, fib_index;
1260 /* Fill in lookup tables with default table (0). */
1261 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1263 vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
1265 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
1267 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
1269 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1270 0 /* honor unnumbered */,
1272 a = ip_interface_address_get_address (&im->lookup_main, ia);
1274 ip4_add_interface_routes (sw_if_index,
1278 ip4_del_interface_routes (im, fib_index,
1279 a, ia->address_length);
1285 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
1287 static clib_error_t *
1288 ip4_sw_interface_add_del (vnet_main_t * vnm,
1292 vlib_main_t * vm = vnm->vlib_main;
1293 ip4_main_t * im = &ip4_main;
1294 ip_lookup_main_t * lm = &im->lookup_main;
1297 for (cast = 0; cast < VNET_N_CAST; cast++)
1299 ip_config_main_t * cm = &lm->rx_config_mains[cast];
1300 vnet_config_main_t * vcm = &cm->config_main;
1302 if (! vcm->node_index_by_feature_index)
1304 if (cast == VNET_UNICAST)
1306 static char * start_nodes[] = { "ip4-input", "ip4-input-no-checksum", };
1307 static char * feature_nodes[] = {
1308 [IP4_RX_FEATURE_CHECK_ACCESS] = "ip4-inacl",
1309 [IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_RX] = "ip4-source-check-via-rx",
1310 [IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_ANY] = "ip4-source-check-via-any",
1311 [IP4_RX_FEATURE_IPSEC] = "ipsec-input-ip4",
1312 [IP4_RX_FEATURE_VPATH] = "vpath-input-ip4",
1313 [IP4_RX_FEATURE_LOOKUP] = "ip4-lookup",
1316 vnet_config_init (vm, vcm,
1317 start_nodes, ARRAY_LEN (start_nodes),
1318 feature_nodes, ARRAY_LEN (feature_nodes));
1322 static char * start_nodes[] = { "ip4-input", "ip4-input-no-checksum", };
1323 static char * feature_nodes[] = {
1324 [IP4_RX_FEATURE_VPATH] = "vpath-input-ip4",
1325 [IP4_RX_FEATURE_LOOKUP] = "ip4-lookup-multicast",
1328 vnet_config_init (vm, vcm,
1329 start_nodes, ARRAY_LEN (start_nodes),
1330 feature_nodes, ARRAY_LEN (feature_nodes));
1334 vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
1335 ci = cm->config_index_by_sw_if_index[sw_if_index];
1338 ci = vnet_config_add_feature (vm, vcm,
1340 IP4_RX_FEATURE_LOOKUP,
1341 /* config data */ 0,
1342 /* # bytes of config data */ 0);
1344 ci = vnet_config_del_feature (vm, vcm,
1346 IP4_RX_FEATURE_LOOKUP,
1347 /* config data */ 0,
1348 /* # bytes of config data */ 0);
1350 cm->config_index_by_sw_if_index[sw_if_index] = ci;
1353 return /* no error */ 0;
1356 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1358 static u8 * format_ip4_lookup_trace (u8 * s, va_list * args);
1360 VLIB_REGISTER_NODE (ip4_lookup_node) = {
1361 .function = ip4_lookup,
1362 .name = "ip4-lookup",
1363 .vector_size = sizeof (u32),
1365 .format_trace = format_ip4_lookup_trace,
1367 .n_next_nodes = IP_LOOKUP_N_NEXT,
1368 .next_nodes = IP4_LOOKUP_NEXT_NODES,
1371 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup)
1374 ip4_indirect (vlib_main_t * vm,
1375 vlib_node_runtime_t * node,
1376 vlib_frame_t * frame)
1378 return ip4_lookup_inline (vm, node, frame,
1379 /* lookup_for_responses_to_locally_received_packets */ 0,
1380 /* is_indirect */ 1);
1383 VLIB_REGISTER_NODE (ip4_indirect_node) = {
1384 .function = ip4_indirect,
1385 .name = "ip4-indirect",
1386 .vector_size = sizeof (u32),
1388 .format_trace = format_ip4_lookup_trace,
1390 .n_next_nodes = IP_LOOKUP_N_NEXT,
1391 .next_nodes = IP4_LOOKUP_NEXT_NODES,
1394 VLIB_NODE_FUNCTION_MULTIARCH (ip4_indirect_node, ip4_indirect)
1397 /* Global IP4 main. */
1398 ip4_main_t ip4_main;
1401 ip4_lookup_init (vlib_main_t * vm)
1403 ip4_main_t * im = &ip4_main;
1406 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1411 m = pow2_mask (i) << (32 - i);
1414 im->fib_masks[i] = clib_host_to_net_u32 (m);
1417 /* Create FIB with index 0 and table id of 0. */
1418 find_ip4_fib_by_table_index_or_id (im, /* table id */ 0, IP4_ROUTE_FLAG_TABLE_ID);
1420 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1424 pn = pg_get_node (ip4_lookup_node.index);
1425 pn->unformat_edit = unformat_pg_ip4_header;
1429 ethernet_arp_header_t h;
1431 memset (&h, 0, sizeof (h));
1433 /* Set target ethernet address to all zeros. */
1434 memset (h.ip4_over_ethernet[1].ethernet, 0, sizeof (h.ip4_over_ethernet[1].ethernet));
1436 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1437 #define _8(f,v) h.f = v;
1438 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1439 _16 (l3_type, ETHERNET_TYPE_IP4);
1440 _8 (n_l2_address_bytes, 6);
1441 _8 (n_l3_address_bytes, 4);
1442 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1446 vlib_packet_template_init (vm,
1447 &im->ip4_arp_request_packet_template,
1450 /* alloc chunk size */ 8,
1457 VLIB_INIT_FUNCTION (ip4_lookup_init);
1460 /* Adjacency taken. */
1465 /* Packet data, possibly *after* rewrite. */
1466 u8 packet_data[64 - 1*sizeof(u32)];
1467 } ip4_forward_next_trace_t;
1469 static u8 * format_ip4_forward_next_trace (u8 * s, va_list * args)
1471 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1472 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1473 ip4_forward_next_trace_t * t = va_arg (*args, ip4_forward_next_trace_t *);
1474 uword indent = format_get_indent (s);
1475 s = format (s, "%U%U",
1476 format_white_space, indent,
1477 format_ip4_header, t->packet_data);
1481 static u8 * format_ip4_lookup_trace (u8 * s, va_list * args)
1483 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1484 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1485 ip4_forward_next_trace_t * t = va_arg (*args, ip4_forward_next_trace_t *);
1486 vnet_main_t * vnm = vnet_get_main();
1487 ip4_main_t * im = &ip4_main;
1488 uword indent = format_get_indent (s);
1490 s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
1491 t->fib_index, t->adj_index, format_ip_adjacency,
1492 vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1493 s = format (s, "\n%U%U",
1494 format_white_space, indent,
1495 format_ip4_header, t->packet_data);
1499 static u8 * format_ip4_rewrite_trace (u8 * s, va_list * args)
1501 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1502 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1503 ip4_forward_next_trace_t * t = va_arg (*args, ip4_forward_next_trace_t *);
1504 vnet_main_t * vnm = vnet_get_main();
1505 ip4_main_t * im = &ip4_main;
1506 uword indent = format_get_indent (s);
1508 s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
1509 t->fib_index, t->adj_index, format_ip_adjacency,
1510 vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1511 s = format (s, "\n%U%U",
1512 format_white_space, indent,
1513 format_ip_adjacency_packet_data,
1514 vnm, &im->lookup_main, t->adj_index,
1515 t->packet_data, sizeof (t->packet_data));
1519 /* Common trace function for all ip4-forward next nodes. */
1521 ip4_forward_next_trace (vlib_main_t * vm,
1522 vlib_node_runtime_t * node,
1523 vlib_frame_t * frame,
1524 vlib_rx_or_tx_t which_adj_index)
1527 ip4_main_t * im = &ip4_main;
1529 n_left = frame->n_vectors;
1530 from = vlib_frame_vector_args (frame);
1535 vlib_buffer_t * b0, * b1;
1536 ip4_forward_next_trace_t * t0, * t1;
1538 /* Prefetch next iteration. */
1539 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1540 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1545 b0 = vlib_get_buffer (vm, bi0);
1546 b1 = vlib_get_buffer (vm, bi1);
1548 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1550 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1551 t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1552 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1553 t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1554 vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1555 vec_elt (im->fib_index_by_sw_if_index,
1556 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1558 clib_memcpy (t0->packet_data,
1559 vlib_buffer_get_current (b0),
1560 sizeof (t0->packet_data));
1562 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1564 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1565 t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1566 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1567 t1->fib_index = (vnet_buffer(b1)->sw_if_index[VLIB_TX] != (u32)~0) ?
1568 vnet_buffer(b1)->sw_if_index[VLIB_TX] :
1569 vec_elt (im->fib_index_by_sw_if_index,
1570 vnet_buffer(b1)->sw_if_index[VLIB_RX]);
1571 clib_memcpy (t1->packet_data,
1572 vlib_buffer_get_current (b1),
1573 sizeof (t1->packet_data));
1583 ip4_forward_next_trace_t * t0;
1587 b0 = vlib_get_buffer (vm, bi0);
1589 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1591 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1592 t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1593 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1594 t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1595 vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1596 vec_elt (im->fib_index_by_sw_if_index,
1597 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1598 clib_memcpy (t0->packet_data,
1599 vlib_buffer_get_current (b0),
1600 sizeof (t0->packet_data));
1608 ip4_drop_or_punt (vlib_main_t * vm,
1609 vlib_node_runtime_t * node,
1610 vlib_frame_t * frame,
1611 ip4_error_t error_code)
1613 u32 * buffers = vlib_frame_vector_args (frame);
1614 uword n_packets = frame->n_vectors;
1616 vlib_error_drop_buffers (vm, node,
1621 ip4_input_node.index,
1624 if (node->flags & VLIB_NODE_FLAG_TRACE)
1625 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1631 ip4_drop (vlib_main_t * vm,
1632 vlib_node_runtime_t * node,
1633 vlib_frame_t * frame)
1634 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP); }
1637 ip4_punt (vlib_main_t * vm,
1638 vlib_node_runtime_t * node,
1639 vlib_frame_t * frame)
1640 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT); }
1643 ip4_miss (vlib_main_t * vm,
1644 vlib_node_runtime_t * node,
1645 vlib_frame_t * frame)
1646 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_DST_LOOKUP_MISS); }
1648 VLIB_REGISTER_NODE (ip4_drop_node,static) = {
1649 .function = ip4_drop,
1651 .vector_size = sizeof (u32),
1653 .format_trace = format_ip4_forward_next_trace,
1661 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop)
1663 VLIB_REGISTER_NODE (ip4_punt_node,static) = {
1664 .function = ip4_punt,
1666 .vector_size = sizeof (u32),
1668 .format_trace = format_ip4_forward_next_trace,
1676 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt)
1678 VLIB_REGISTER_NODE (ip4_miss_node,static) = {
1679 .function = ip4_miss,
1681 .vector_size = sizeof (u32),
1683 .format_trace = format_ip4_forward_next_trace,
1691 VLIB_NODE_FUNCTION_MULTIARCH (ip4_miss_node, ip4_miss)
1693 /* Compute TCP/UDP/ICMP4 checksum in software. */
1695 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1699 u32 ip_header_length, payload_length_host_byte_order;
1700 u32 n_this_buffer, n_bytes_left;
1702 void * data_this_buffer;
1704 /* Initialize checksum with ip header. */
1705 ip_header_length = ip4_header_bytes (ip0);
1706 payload_length_host_byte_order = clib_net_to_host_u16 (ip0->length) - ip_header_length;
1707 sum0 = clib_host_to_net_u32 (payload_length_host_byte_order + (ip0->protocol << 16));
1709 if (BITS (uword) == 32)
1711 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u32));
1712 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->dst_address, u32));
1715 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1717 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1718 data_this_buffer = (void *) ip0 + ip_header_length;
1719 if (n_this_buffer + ip_header_length > p0->current_length)
1720 n_this_buffer = p0->current_length > ip_header_length ? p0->current_length - ip_header_length : 0;
1723 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1724 n_bytes_left -= n_this_buffer;
1725 if (n_bytes_left == 0)
1728 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1729 p0 = vlib_get_buffer (vm, p0->next_buffer);
1730 data_this_buffer = vlib_buffer_get_current (p0);
1731 n_this_buffer = p0->current_length;
1734 sum16 = ~ ip_csum_fold (sum0);
1740 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1742 ip4_header_t * ip0 = vlib_buffer_get_current (p0);
1743 udp_header_t * udp0;
1746 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1747 || ip0->protocol == IP_PROTOCOL_UDP);
1749 udp0 = (void *) (ip0 + 1);
1750 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1752 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1753 | IP_BUFFER_L4_CHECKSUM_CORRECT);
1757 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1759 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1760 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1766 ip4_local (vlib_main_t * vm,
1767 vlib_node_runtime_t * node,
1768 vlib_frame_t * frame)
1770 ip4_main_t * im = &ip4_main;
1771 ip_lookup_main_t * lm = &im->lookup_main;
1772 ip_local_next_t next_index;
1773 u32 * from, * to_next, n_left_from, n_left_to_next;
1774 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
1776 from = vlib_frame_vector_args (frame);
1777 n_left_from = frame->n_vectors;
1778 next_index = node->cached_next_index;
1780 if (node->flags & VLIB_NODE_FLAG_TRACE)
1781 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1783 while (n_left_from > 0)
1785 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1787 while (n_left_from >= 4 && n_left_to_next >= 2)
1789 vlib_buffer_t * p0, * p1;
1790 ip4_header_t * ip0, * ip1;
1791 udp_header_t * udp0, * udp1;
1792 ip4_fib_mtrie_t * mtrie0, * mtrie1;
1793 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1794 ip_adjacency_t * adj0, * adj1;
1795 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, adj_index0;
1796 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, adj_index1;
1797 i32 len_diff0, len_diff1;
1798 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1799 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1802 pi0 = to_next[0] = from[0];
1803 pi1 = to_next[1] = from[1];
1807 n_left_to_next -= 2;
1809 p0 = vlib_get_buffer (vm, pi0);
1810 p1 = vlib_get_buffer (vm, pi1);
1812 ip0 = vlib_buffer_get_current (p0);
1813 ip1 = vlib_buffer_get_current (p1);
1815 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
1816 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
1817 fib_index1 = vec_elt (im->fib_index_by_sw_if_index,
1818 vnet_buffer(p1)->sw_if_index[VLIB_RX]);
1820 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
1821 mtrie1 = &vec_elt_at_index (im->fibs, fib_index1)->mtrie;
1823 leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
1825 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1826 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 0);
1828 /* Treat IP frag packets as "experimental" protocol for now
1829 until support of IP frag reassembly is implemented */
1830 proto0 = ip4_is_fragment(ip0) ? 0xfe : ip0->protocol;
1831 proto1 = ip4_is_fragment(ip1) ? 0xfe : ip1->protocol;
1832 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1833 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1834 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1835 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1840 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1841 good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1843 udp0 = ip4_next_header (ip0);
1844 udp1 = ip4_next_header (ip1);
1846 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1847 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1848 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1850 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1851 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 1);
1853 /* Verify UDP length. */
1854 ip_len0 = clib_net_to_host_u16 (ip0->length);
1855 ip_len1 = clib_net_to_host_u16 (ip1->length);
1856 udp_len0 = clib_net_to_host_u16 (udp0->length);
1857 udp_len1 = clib_net_to_host_u16 (udp1->length);
1859 len_diff0 = ip_len0 - udp_len0;
1860 len_diff1 = ip_len1 - udp_len1;
1862 len_diff0 = is_udp0 ? len_diff0 : 0;
1863 len_diff1 = is_udp1 ? len_diff1 : 0;
1865 if (PREDICT_FALSE (! (is_tcp_udp0 & is_tcp_udp1
1866 & good_tcp_udp0 & good_tcp_udp1)))
1871 && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1872 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1874 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1875 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1880 && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1881 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1883 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1884 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1888 good_tcp_udp0 &= len_diff0 >= 0;
1889 good_tcp_udp1 &= len_diff1 >= 0;
1891 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1892 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1894 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1896 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1897 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1899 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1900 error0 = (is_tcp_udp0 && ! good_tcp_udp0
1901 ? IP4_ERROR_TCP_CHECKSUM + is_udp0
1903 error1 = (is_tcp_udp1 && ! good_tcp_udp1
1904 ? IP4_ERROR_TCP_CHECKSUM + is_udp1
1907 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1908 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1910 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1911 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
1913 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1914 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
1916 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
1918 /* no_default_route */ 1));
1919 ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, fib_index1,
1921 /* no_default_route */ 1));
1923 adj0 = ip_get_adjacency (lm, adj_index0);
1924 adj1 = ip_get_adjacency (lm, adj_index1);
1927 * Must have a route to source otherwise we drop the packet.
1928 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1930 error0 = (error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1931 && adj0->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
1932 && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP
1933 && adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
1934 && ip0->dst_address.as_u32 != 0xFFFFFFFF
1935 ? IP4_ERROR_SRC_LOOKUP_MISS
1937 error1 = (error1 == IP4_ERROR_UNKNOWN_PROTOCOL
1938 && adj1->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
1939 && adj1->lookup_next_index != IP_LOOKUP_NEXT_ARP
1940 && adj1->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
1941 && ip0->dst_address.as_u32 != 0xFFFFFFFF
1942 ? IP4_ERROR_SRC_LOOKUP_MISS
1945 next0 = lm->local_next_by_ip_protocol[proto0];
1946 next1 = lm->local_next_by_ip_protocol[proto1];
1948 next0 = error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1949 next1 = error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1951 p0->error = error0 ? error_node->errors[error0] : 0;
1952 p1->error = error1 ? error_node->errors[error1] : 0;
1954 enqueue_code = (next0 != next_index) + 2*(next1 != next_index);
1956 if (PREDICT_FALSE (enqueue_code != 0))
1958 switch (enqueue_code)
1964 n_left_to_next += 1;
1965 vlib_set_next_frame_buffer (vm, node, next0, pi0);
1971 n_left_to_next += 1;
1972 vlib_set_next_frame_buffer (vm, node, next1, pi1);
1976 /* A B B or A B C */
1978 n_left_to_next += 2;
1979 vlib_set_next_frame_buffer (vm, node, next0, pi0);
1980 vlib_set_next_frame_buffer (vm, node, next1, pi1);
1983 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1985 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1992 while (n_left_from > 0 && n_left_to_next > 0)
1996 udp_header_t * udp0;
1997 ip4_fib_mtrie_t * mtrie0;
1998 ip4_fib_mtrie_leaf_t leaf0;
1999 ip_adjacency_t * adj0;
2000 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, adj_index0;
2002 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
2004 pi0 = to_next[0] = from[0];
2008 n_left_to_next -= 1;
2010 p0 = vlib_get_buffer (vm, pi0);
2012 ip0 = vlib_buffer_get_current (p0);
2014 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
2015 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
2017 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
2019 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
2021 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
2023 /* Treat IP frag packets as "experimental" protocol for now
2024 until support of IP frag reassembly is implemented */
2025 proto0 = ip4_is_fragment(ip0) ? 0xfe : ip0->protocol;
2026 is_udp0 = proto0 == IP_PROTOCOL_UDP;
2027 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
2031 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
2033 udp0 = ip4_next_header (ip0);
2035 /* Don't verify UDP checksum for packets with explicit zero checksum. */
2036 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
2038 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
2040 /* Verify UDP length. */
2041 ip_len0 = clib_net_to_host_u16 (ip0->length);
2042 udp_len0 = clib_net_to_host_u16 (udp0->length);
2044 len_diff0 = ip_len0 - udp_len0;
2046 len_diff0 = is_udp0 ? len_diff0 : 0;
2048 if (PREDICT_FALSE (! (is_tcp_udp0 & good_tcp_udp0)))
2053 && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
2054 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
2056 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
2057 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
2061 good_tcp_udp0 &= len_diff0 >= 0;
2063 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
2065 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
2067 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
2069 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
2070 error0 = (is_tcp_udp0 && ! good_tcp_udp0
2071 ? IP4_ERROR_TCP_CHECKSUM + is_udp0
2074 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
2076 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2077 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
2079 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
2081 /* no_default_route */ 1));
2083 adj0 = ip_get_adjacency (lm, adj_index0);
2085 /* Must have a route to source otherwise we drop the packet. */
2086 error0 = (error0 == IP4_ERROR_UNKNOWN_PROTOCOL
2087 && adj0->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
2088 && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP
2089 && adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
2090 && ip0->dst_address.as_u32 != 0xFFFFFFFF
2091 ? IP4_ERROR_SRC_LOOKUP_MISS
2094 next0 = lm->local_next_by_ip_protocol[proto0];
2096 next0 = error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
2098 p0->error = error0? error_node->errors[error0] : 0;
2100 if (PREDICT_FALSE (next0 != next_index))
2102 n_left_to_next += 1;
2103 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2106 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2109 n_left_to_next -= 1;
2113 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2116 return frame->n_vectors;
2119 VLIB_REGISTER_NODE (ip4_local_node,static) = {
2120 .function = ip4_local,
2121 .name = "ip4-local",
2122 .vector_size = sizeof (u32),
2124 .format_trace = format_ip4_forward_next_trace,
2126 .n_next_nodes = IP_LOCAL_N_NEXT,
2128 [IP_LOCAL_NEXT_DROP] = "error-drop",
2129 [IP_LOCAL_NEXT_PUNT] = "error-punt",
2130 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
2131 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
2135 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local)
2137 void ip4_register_protocol (u32 protocol, u32 node_index)
2139 vlib_main_t * vm = vlib_get_main();
2140 ip4_main_t * im = &ip4_main;
2141 ip_lookup_main_t * lm = &im->lookup_main;
2143 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
2144 lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip4_local_node.index, node_index);
2147 static clib_error_t *
2148 show_ip_local_command_fn (vlib_main_t * vm,
2149 unformat_input_t * input,
2150 vlib_cli_command_t * cmd)
2152 ip4_main_t * im = &ip4_main;
2153 ip_lookup_main_t * lm = &im->lookup_main;
2156 vlib_cli_output (vm, "Protocols handled by ip4_local");
2157 for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
2159 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2160 vlib_cli_output (vm, "%d", i);
2167 VLIB_CLI_COMMAND (show_ip_local, static) = {
2168 .path = "show ip local",
2169 .function = show_ip_local_command_fn,
2170 .short_help = "Show ip local protocol table",
2174 ip4_arp (vlib_main_t * vm,
2175 vlib_node_runtime_t * node,
2176 vlib_frame_t * frame)
2178 vnet_main_t * vnm = vnet_get_main();
2179 ip4_main_t * im = &ip4_main;
2180 ip_lookup_main_t * lm = &im->lookup_main;
2181 u32 * from, * to_next_drop;
2182 uword n_left_from, n_left_to_next_drop, next_index;
2183 static f64 time_last_seed_change = -1e100;
2184 static u32 hash_seeds[3];
2185 static uword hash_bitmap[256 / BITS (uword)];
2188 if (node->flags & VLIB_NODE_FLAG_TRACE)
2189 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2191 time_now = vlib_time_now (vm);
2192 if (time_now - time_last_seed_change > 1e-3)
2195 u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
2196 sizeof (hash_seeds));
2197 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2198 hash_seeds[i] = r[i];
2200 /* Mark all hash keys as been no-seen before. */
2201 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2204 time_last_seed_change = time_now;
2207 from = vlib_frame_vector_args (frame);
2208 n_left_from = frame->n_vectors;
2209 next_index = node->cached_next_index;
2210 if (next_index == IP4_ARP_NEXT_DROP)
2211 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2213 while (n_left_from > 0)
2215 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2216 to_next_drop, n_left_to_next_drop);
2218 while (n_left_from > 0 && n_left_to_next_drop > 0)
2222 ethernet_header_t * eh0;
2223 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2225 ip_adjacency_t * adj0;
2229 p0 = vlib_get_buffer (vm, pi0);
2231 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2232 adj0 = ip_get_adjacency (lm, adj_index0);
2233 ip0 = vlib_buffer_get_current (p0);
2235 /* If packet destination is not local, send ARP to next hop */
2236 if (adj0->arp.next_hop.ip4.as_u32)
2237 ip0->dst_address.data_u32 = adj0->arp.next_hop.ip4.as_u32;
2240 * if ip4_rewrite_local applied the IP_LOOKUP_NEXT_ARP
2241 * rewrite to this packet, we need to skip it here.
2242 * Note, to distinguish from src IP addr *.8.6.*, we
2243 * check for a bcast eth dest instead of IPv4 version.
2245 eh0 = (ethernet_header_t*)ip0;
2246 if ((ip0->ip_version_and_header_length & 0xF0) != 0x40)
2249 u16 * etype = &eh0->type;
2250 while ((*etype == clib_host_to_net_u16 (0x8100)) //dot1q
2251 || (*etype == clib_host_to_net_u16 (0x88a8)))//dot1ad
2254 etype += 2; //vlan tag also 16 bits, same as etype
2256 if (*etype == clib_host_to_net_u16 (0x0806)) //arp
2258 vlib_buffer_advance (
2259 p0, sizeof(ethernet_header_t) + (4*vlan_num));
2260 ip0 = vlib_buffer_get_current (p0);
2268 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2269 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2271 a0 ^= ip0->dst_address.data_u32;
2274 hash_v3_finalize32 (a0, b0, c0);
2276 c0 &= BITS (hash_bitmap) - 1;
2277 c0 = c0 / BITS (uword);
2278 m0 = (uword) 1 << (c0 % BITS (uword));
2280 bm0 = hash_bitmap[c0];
2281 drop0 = (bm0 & m0) != 0;
2283 /* Mark it as seen. */
2284 hash_bitmap[c0] = bm0 | m0;
2288 to_next_drop[0] = pi0;
2290 n_left_to_next_drop -= 1;
2292 p0->error = node->errors[drop0 ? IP4_ARP_ERROR_DROP : IP4_ARP_ERROR_REQUEST_SENT];
2298 * Can happen if the control-plane is programming tables
2299 * with traffic flowing; at least that's today's lame excuse.
2301 if (adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP)
2303 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2306 /* Send ARP request. */
2310 ethernet_arp_header_t * h0;
2311 vnet_hw_interface_t * hw_if0;
2313 h0 = vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template, &bi0);
2315 /* Add rewrite/encap string for ARP packet. */
2316 vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
2318 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2320 /* Src ethernet address in ARP header. */
2321 clib_memcpy (h0->ip4_over_ethernet[0].ethernet, hw_if0->hw_address,
2322 sizeof (h0->ip4_over_ethernet[0].ethernet));
2324 ip4_src_address_for_packet (im, p0, &h0->ip4_over_ethernet[0].ip4, sw_if_index0);
2326 /* Copy in destination address we are requesting. */
2327 h0->ip4_over_ethernet[1].ip4.data_u32 = ip0->dst_address.data_u32;
2329 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2330 b0 = vlib_get_buffer (vm, bi0);
2331 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2333 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2335 vlib_set_next_frame_buffer (vm, node, adj0->rewrite_header.next_index, bi0);
2339 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2342 return frame->n_vectors;
2345 static char * ip4_arp_error_strings[] = {
2346 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2347 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2348 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2349 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2350 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2353 VLIB_REGISTER_NODE (ip4_arp_node) = {
2354 .function = ip4_arp,
2356 .vector_size = sizeof (u32),
2358 .format_trace = format_ip4_forward_next_trace,
2360 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
2361 .error_strings = ip4_arp_error_strings,
2363 .n_next_nodes = IP4_ARP_N_NEXT,
2365 [IP4_ARP_NEXT_DROP] = "error-drop",
2369 #define foreach_notrace_ip4_arp_error \
2375 clib_error_t * arp_notrace_init (vlib_main_t * vm)
2377 vlib_node_runtime_t *rt =
2378 vlib_node_get_runtime (vm, ip4_arp_node.index);
2380 /* don't trace ARP request packets */
2382 vnet_pcap_drop_trace_filter_add_del \
2383 (rt->errors[IP4_ARP_ERROR_##a], \
2385 foreach_notrace_ip4_arp_error;
2390 VLIB_INIT_FUNCTION(arp_notrace_init);
2393 /* Send an ARP request to see if given destination is reachable on given interface. */
2395 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2397 vnet_main_t * vnm = vnet_get_main();
2398 ip4_main_t * im = &ip4_main;
2399 ethernet_arp_header_t * h;
2400 ip4_address_t * src;
2401 ip_interface_address_t * ia;
2402 ip_adjacency_t * adj;
2403 vnet_hw_interface_t * hi;
2404 vnet_sw_interface_t * si;
2408 si = vnet_get_sw_interface (vnm, sw_if_index);
2410 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2412 return clib_error_return (0, "%U: interface %U down",
2413 format_ip4_address, dst,
2414 format_vnet_sw_if_index_name, vnm,
2418 src = ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2421 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2422 return clib_error_return
2423 (0, "no matching interface address for destination %U (interface %U)",
2424 format_ip4_address, dst,
2425 format_vnet_sw_if_index_name, vnm, sw_if_index);
2428 adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2430 h = vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template, &bi);
2432 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2434 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
2436 h->ip4_over_ethernet[0].ip4 = src[0];
2437 h->ip4_over_ethernet[1].ip4 = dst[0];
2439 b = vlib_get_buffer (vm, bi);
2440 vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2442 /* Add encapsulation string for software interface (e.g. ethernet header). */
2443 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2444 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2447 vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
2448 u32 * to_next = vlib_frame_vector_args (f);
2451 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2454 return /* no error */ 0;
2458 IP4_REWRITE_NEXT_DROP,
2459 IP4_REWRITE_NEXT_ARP,
2460 } ip4_rewrite_next_t;
2463 ip4_rewrite_inline (vlib_main_t * vm,
2464 vlib_node_runtime_t * node,
2465 vlib_frame_t * frame,
2466 int rewrite_for_locally_received_packets)
2468 ip_lookup_main_t * lm = &ip4_main.lookup_main;
2469 u32 * from = vlib_frame_vector_args (frame);
2470 u32 n_left_from, n_left_to_next, * to_next, next_index;
2471 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
2472 vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
2474 n_left_from = frame->n_vectors;
2475 next_index = node->cached_next_index;
2476 u32 cpu_index = os_get_cpu_number();
2478 while (n_left_from > 0)
2480 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2482 while (n_left_from >= 4 && n_left_to_next >= 2)
2484 ip_adjacency_t * adj0, * adj1;
2485 vlib_buffer_t * p0, * p1;
2486 ip4_header_t * ip0, * ip1;
2487 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2488 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2489 u32 next0_override, next1_override;
2491 if (rewrite_for_locally_received_packets)
2492 next0_override = next1_override = 0;
2494 /* Prefetch next iteration. */
2496 vlib_buffer_t * p2, * p3;
2498 p2 = vlib_get_buffer (vm, from[2]);
2499 p3 = vlib_get_buffer (vm, from[3]);
2501 vlib_prefetch_buffer_header (p2, STORE);
2502 vlib_prefetch_buffer_header (p3, STORE);
2504 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2505 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2508 pi0 = to_next[0] = from[0];
2509 pi1 = to_next[1] = from[1];
2514 n_left_to_next -= 2;
2516 p0 = vlib_get_buffer (vm, pi0);
2517 p1 = vlib_get_buffer (vm, pi1);
2519 adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2520 adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
2522 /* We should never rewrite a pkt using the MISS adjacency */
2523 ASSERT(adj_index0 && adj_index1);
2525 ip0 = vlib_buffer_get_current (p0);
2526 ip1 = vlib_buffer_get_current (p1);
2528 error0 = error1 = IP4_ERROR_NONE;
2530 /* Decrement TTL & update checksum.
2531 Works either endian, so no need for byte swap. */
2532 if (! rewrite_for_locally_received_packets)
2534 i32 ttl0 = ip0->ttl, ttl1 = ip1->ttl;
2536 /* Input node should have reject packets with ttl 0. */
2537 ASSERT (ip0->ttl > 0);
2538 ASSERT (ip1->ttl > 0);
2540 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2541 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2543 checksum0 += checksum0 >= 0xffff;
2544 checksum1 += checksum1 >= 0xffff;
2546 ip0->checksum = checksum0;
2547 ip1->checksum = checksum1;
2555 error0 = ttl0 <= 0 ? IP4_ERROR_TIME_EXPIRED : error0;
2556 error1 = ttl1 <= 0 ? IP4_ERROR_TIME_EXPIRED : error1;
2558 /* Verify checksum. */
2559 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2560 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2563 /* Rewrite packet header and updates lengths. */
2564 adj0 = ip_get_adjacency (lm, adj_index0);
2565 adj1 = ip_get_adjacency (lm, adj_index1);
2567 if (rewrite_for_locally_received_packets)
2570 * If someone sends e.g. an icmp4 w/ src = dst = interface addr,
2571 * we end up here with a local adjacency in hand
2572 * The local adj rewrite data is 0xfefe on purpose.
2573 * Bad engineer, no donut for you.
2575 if (PREDICT_FALSE(adj0->lookup_next_index
2576 == IP_LOOKUP_NEXT_LOCAL))
2577 error0 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2578 if (PREDICT_FALSE(adj0->lookup_next_index
2579 == IP_LOOKUP_NEXT_ARP))
2580 next0_override = IP4_REWRITE_NEXT_ARP;
2581 if (PREDICT_FALSE(adj1->lookup_next_index
2582 == IP_LOOKUP_NEXT_LOCAL))
2583 error1 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2584 if (PREDICT_FALSE(adj1->lookup_next_index
2585 == IP_LOOKUP_NEXT_ARP))
2586 next1_override = IP4_REWRITE_NEXT_ARP;
2589 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2590 rw_len0 = adj0[0].rewrite_header.data_bytes;
2591 rw_len1 = adj1[0].rewrite_header.data_bytes;
2592 next0 = (error0 == IP4_ERROR_NONE)
2593 ? adj0[0].rewrite_header.next_index : 0;
2595 if (rewrite_for_locally_received_packets)
2596 next0 = next0 && next0_override ? next0_override : next0;
2598 next1 = (error1 == IP4_ERROR_NONE)
2599 ? adj1[0].rewrite_header.next_index : 0;
2601 if (rewrite_for_locally_received_packets)
2602 next1 = next1 && next1_override ? next1_override : next1;
2605 * We've already accounted for an ethernet_header_t elsewhere
2607 if (PREDICT_FALSE (rw_len0 > sizeof(ethernet_header_t)))
2608 vlib_increment_combined_counter
2609 (&lm->adjacency_counters,
2610 cpu_index, adj_index0,
2611 /* packet increment */ 0,
2612 /* byte increment */ rw_len0-sizeof(ethernet_header_t));
2614 if (PREDICT_FALSE (rw_len1 > sizeof(ethernet_header_t)))
2615 vlib_increment_combined_counter
2616 (&lm->adjacency_counters,
2617 cpu_index, adj_index1,
2618 /* packet increment */ 0,
2619 /* byte increment */ rw_len1-sizeof(ethernet_header_t));
2621 /* Check MTU of outgoing interface. */
2622 error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2623 ? IP4_ERROR_MTU_EXCEEDED
2625 error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
2626 ? IP4_ERROR_MTU_EXCEEDED
2629 p0->current_data -= rw_len0;
2630 p1->current_data -= rw_len1;
2632 p0->current_length += rw_len0;
2633 p1->current_length += rw_len1;
2635 vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2636 vnet_buffer (p1)->sw_if_index[VLIB_TX] = adj1[0].rewrite_header.sw_if_index;
2638 p0->error = error_node->errors[error0];
2639 p1->error = error_node->errors[error1];
2641 /* Guess we are only writing on simple Ethernet header. */
2642 vnet_rewrite_two_headers (adj0[0], adj1[0],
2644 sizeof (ethernet_header_t));
2646 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2647 to_next, n_left_to_next,
2648 pi0, pi1, next0, next1);
2651 while (n_left_from > 0 && n_left_to_next > 0)
2653 ip_adjacency_t * adj0;
2656 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2659 if (rewrite_for_locally_received_packets)
2662 pi0 = to_next[0] = from[0];
2664 p0 = vlib_get_buffer (vm, pi0);
2666 adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2668 /* We should never rewrite a pkt using the MISS adjacency */
2671 adj0 = ip_get_adjacency (lm, adj_index0);
2673 ip0 = vlib_buffer_get_current (p0);
2675 error0 = IP4_ERROR_NONE;
2676 next0 = 0; /* drop on error */
2678 /* Decrement TTL & update checksum. */
2679 if (! rewrite_for_locally_received_packets)
2681 i32 ttl0 = ip0->ttl;
2683 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2685 checksum0 += checksum0 >= 0xffff;
2687 ip0->checksum = checksum0;
2689 ASSERT (ip0->ttl > 0);
2695 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2697 error0 = ttl0 <= 0 ? IP4_ERROR_TIME_EXPIRED : error0;
2700 if (rewrite_for_locally_received_packets)
2703 * If someone sends e.g. an icmp4 w/ src = dst = interface addr,
2704 * we end up here with a local adjacency in hand
2705 * The local adj rewrite data is 0xfefe on purpose.
2706 * Bad engineer, no donut for you.
2708 if (PREDICT_FALSE(adj0->lookup_next_index
2709 == IP_LOOKUP_NEXT_LOCAL))
2710 error0 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2712 * We have to override the next_index in ARP adjacencies,
2713 * because they're set up for ip4-arp, not this node...
2715 if (PREDICT_FALSE(adj0->lookup_next_index
2716 == IP_LOOKUP_NEXT_ARP))
2717 next0_override = IP4_REWRITE_NEXT_ARP;
2720 /* Guess we are only writing on simple Ethernet header. */
2721 vnet_rewrite_one_header (adj0[0], ip0,
2722 sizeof (ethernet_header_t));
2724 /* Update packet buffer attributes/set output interface. */
2725 rw_len0 = adj0[0].rewrite_header.data_bytes;
2727 if (PREDICT_FALSE (rw_len0 > sizeof(ethernet_header_t)))
2728 vlib_increment_combined_counter
2729 (&lm->adjacency_counters,
2730 cpu_index, adj_index0,
2731 /* packet increment */ 0,
2732 /* byte increment */ rw_len0-sizeof(ethernet_header_t));
2734 /* Check MTU of outgoing interface. */
2735 error0 = (vlib_buffer_length_in_chain (vm, p0)
2736 > adj0[0].rewrite_header.max_l3_packet_bytes
2737 ? IP4_ERROR_MTU_EXCEEDED
2740 p0->error = error_node->errors[error0];
2741 p0->current_data -= rw_len0;
2742 p0->current_length += rw_len0;
2743 vnet_buffer (p0)->sw_if_index[VLIB_TX] =
2744 adj0[0].rewrite_header.sw_if_index;
2746 next0 = (error0 == IP4_ERROR_NONE)
2747 ? adj0[0].rewrite_header.next_index : 0;
2749 if (rewrite_for_locally_received_packets)
2750 next0 = next0 && next0_override ? next0_override : next0;
2755 n_left_to_next -= 1;
2757 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2758 to_next, n_left_to_next,
2762 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2765 /* Need to do trace after rewrites to pick up new packet data. */
2766 if (node->flags & VLIB_NODE_FLAG_TRACE)
2767 ip4_forward_next_trace (vm, node, frame, adj_rx_tx);
2769 return frame->n_vectors;
2773 ip4_rewrite_transit (vlib_main_t * vm,
2774 vlib_node_runtime_t * node,
2775 vlib_frame_t * frame)
2777 return ip4_rewrite_inline (vm, node, frame,
2778 /* rewrite_for_locally_received_packets */ 0);
2782 ip4_rewrite_local (vlib_main_t * vm,
2783 vlib_node_runtime_t * node,
2784 vlib_frame_t * frame)
2786 return ip4_rewrite_inline (vm, node, frame,
2787 /* rewrite_for_locally_received_packets */ 1);
2790 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2791 .function = ip4_rewrite_transit,
2792 .name = "ip4-rewrite-transit",
2793 .vector_size = sizeof (u32),
2795 .format_trace = format_ip4_rewrite_trace,
2799 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2800 [IP4_REWRITE_NEXT_ARP] = "ip4-arp",
2804 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite_transit)
2806 VLIB_REGISTER_NODE (ip4_rewrite_local_node) = {
2807 .function = ip4_rewrite_local,
2808 .name = "ip4-rewrite-local",
2809 .vector_size = sizeof (u32),
2811 .sibling_of = "ip4-rewrite-transit",
2813 .format_trace = format_ip4_rewrite_trace,
2818 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_local_node, ip4_rewrite_local)
2820 static clib_error_t *
2821 add_del_interface_table (vlib_main_t * vm,
2822 unformat_input_t * input,
2823 vlib_cli_command_t * cmd)
2825 vnet_main_t * vnm = vnet_get_main();
2826 clib_error_t * error = 0;
2827 u32 sw_if_index, table_id;
2831 if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2833 error = clib_error_return (0, "unknown interface `%U'",
2834 format_unformat_error, input);
2838 if (unformat (input, "%d", &table_id))
2842 error = clib_error_return (0, "expected table id `%U'",
2843 format_unformat_error, input);
2848 ip4_main_t * im = &ip4_main;
2849 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_id, IP4_ROUTE_FLAG_TABLE_ID);
2853 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2854 im->fib_index_by_sw_if_index[sw_if_index] = fib->index;
2862 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) = {
2863 .path = "set interface ip table",
2864 .function = add_del_interface_table,
2865 .short_help = "Add/delete FIB table id for interface",
2870 ip4_lookup_multicast (vlib_main_t * vm,
2871 vlib_node_runtime_t * node,
2872 vlib_frame_t * frame)
2874 ip4_main_t * im = &ip4_main;
2875 ip_lookup_main_t * lm = &im->lookup_main;
2876 vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
2877 u32 n_left_from, n_left_to_next, * from, * to_next;
2878 ip_lookup_next_t next;
2879 u32 cpu_index = os_get_cpu_number();
2881 from = vlib_frame_vector_args (frame);
2882 n_left_from = frame->n_vectors;
2883 next = node->cached_next_index;
2885 while (n_left_from > 0)
2887 vlib_get_next_frame (vm, node, next,
2888 to_next, n_left_to_next);
2890 while (n_left_from >= 4 && n_left_to_next >= 2)
2892 vlib_buffer_t * p0, * p1;
2893 u32 pi0, pi1, adj_index0, adj_index1, wrong_next;
2894 ip_lookup_next_t next0, next1;
2895 ip4_header_t * ip0, * ip1;
2896 ip_adjacency_t * adj0, * adj1;
2897 u32 fib_index0, fib_index1;
2898 u32 flow_hash_config0, flow_hash_config1;
2900 /* Prefetch next iteration. */
2902 vlib_buffer_t * p2, * p3;
2904 p2 = vlib_get_buffer (vm, from[2]);
2905 p3 = vlib_get_buffer (vm, from[3]);
2907 vlib_prefetch_buffer_header (p2, LOAD);
2908 vlib_prefetch_buffer_header (p3, LOAD);
2910 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
2911 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
2914 pi0 = to_next[0] = from[0];
2915 pi1 = to_next[1] = from[1];
2917 p0 = vlib_get_buffer (vm, pi0);
2918 p1 = vlib_get_buffer (vm, pi1);
2920 ip0 = vlib_buffer_get_current (p0);
2921 ip1 = vlib_buffer_get_current (p1);
2923 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
2924 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
2925 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
2926 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
2927 fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
2928 fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
2930 adj_index0 = ip4_fib_lookup_buffer (im, fib_index0,
2931 &ip0->dst_address, p0);
2932 adj_index1 = ip4_fib_lookup_buffer (im, fib_index1,
2933 &ip1->dst_address, p1);
2935 adj0 = ip_get_adjacency (lm, adj_index0);
2936 adj1 = ip_get_adjacency (lm, adj_index1);
2938 next0 = adj0->lookup_next_index;
2939 next1 = adj1->lookup_next_index;
2942 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
2945 vec_elt_at_index (im->fibs, fib_index1)->flow_hash_config;
2947 vnet_buffer (p0)->ip.flow_hash = ip4_compute_flow_hash
2948 (ip0, flow_hash_config0);
2950 vnet_buffer (p1)->ip.flow_hash = ip4_compute_flow_hash
2951 (ip1, flow_hash_config1);
2953 ASSERT (adj0->n_adj > 0);
2954 ASSERT (adj1->n_adj > 0);
2955 ASSERT (is_pow2 (adj0->n_adj));
2956 ASSERT (is_pow2 (adj1->n_adj));
2957 adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
2958 adj_index1 += (vnet_buffer (p1)->ip.flow_hash & (adj1->n_adj - 1));
2960 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
2961 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
2963 if (1) /* $$$$$$ HACK FIXME */
2964 vlib_increment_combined_counter
2965 (cm, cpu_index, adj_index0, 1,
2966 vlib_buffer_length_in_chain (vm, p0));
2967 if (1) /* $$$$$$ HACK FIXME */
2968 vlib_increment_combined_counter
2969 (cm, cpu_index, adj_index1, 1,
2970 vlib_buffer_length_in_chain (vm, p1));
2974 n_left_to_next -= 2;
2977 wrong_next = (next0 != next) + 2*(next1 != next);
2978 if (PREDICT_FALSE (wrong_next != 0))
2986 n_left_to_next += 1;
2987 vlib_set_next_frame_buffer (vm, node, next0, pi0);
2993 n_left_to_next += 1;
2994 vlib_set_next_frame_buffer (vm, node, next1, pi1);
3000 n_left_to_next += 2;
3001 vlib_set_next_frame_buffer (vm, node, next0, pi0);
3002 vlib_set_next_frame_buffer (vm, node, next1, pi1);
3006 vlib_put_next_frame (vm, node, next, n_left_to_next);
3008 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
3014 while (n_left_from > 0 && n_left_to_next > 0)
3018 u32 pi0, adj_index0;
3019 ip_lookup_next_t next0;
3020 ip_adjacency_t * adj0;
3022 u32 flow_hash_config0;
3027 p0 = vlib_get_buffer (vm, pi0);
3029 ip0 = vlib_buffer_get_current (p0);
3031 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
3032 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
3033 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
3034 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
3036 adj_index0 = ip4_fib_lookup_buffer (im, fib_index0,
3037 &ip0->dst_address, p0);
3039 adj0 = ip_get_adjacency (lm, adj_index0);
3041 next0 = adj0->lookup_next_index;
3044 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
3046 vnet_buffer (p0)->ip.flow_hash =
3047 ip4_compute_flow_hash (ip0, flow_hash_config0);
3049 ASSERT (adj0->n_adj > 0);
3050 ASSERT (is_pow2 (adj0->n_adj));
3051 adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
3053 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
3055 if (1) /* $$$$$$ HACK FIXME */
3056 vlib_increment_combined_counter
3057 (cm, cpu_index, adj_index0, 1,
3058 vlib_buffer_length_in_chain (vm, p0));
3062 n_left_to_next -= 1;
3065 if (PREDICT_FALSE (next0 != next))
3067 n_left_to_next += 1;
3068 vlib_put_next_frame (vm, node, next, n_left_to_next);
3070 vlib_get_next_frame (vm, node, next,
3071 to_next, n_left_to_next);
3074 n_left_to_next -= 1;
3078 vlib_put_next_frame (vm, node, next, n_left_to_next);
3081 if (node->flags & VLIB_NODE_FLAG_TRACE)
3082 ip4_forward_next_trace(vm, node, frame, VLIB_TX);
3084 return frame->n_vectors;
3087 VLIB_REGISTER_NODE (ip4_lookup_multicast_node,static) = {
3088 .function = ip4_lookup_multicast,
3089 .name = "ip4-lookup-multicast",
3090 .vector_size = sizeof (u32),
3092 .format_trace = format_ip4_lookup_trace,
3094 .n_next_nodes = IP_LOOKUP_N_NEXT,
3095 .next_nodes = IP4_LOOKUP_NEXT_NODES,
3098 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_multicast_node, ip4_lookup_multicast)
3100 VLIB_REGISTER_NODE (ip4_multicast_node,static) = {
3101 .function = ip4_drop,
3102 .name = "ip4-multicast",
3103 .vector_size = sizeof (u32),
3105 .format_trace = format_ip4_forward_next_trace,
3113 int ip4_lookup_validate (ip4_address_t *a, u32 fib_index0)
3115 ip4_main_t * im = &ip4_main;
3116 ip4_fib_mtrie_t * mtrie0;
3117 ip4_fib_mtrie_leaf_t leaf0;
3120 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
3122 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
3123 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 0);
3124 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 1);
3125 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
3126 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
3128 /* Handle default route. */
3129 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
3131 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
3133 return adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
3135 /* no_default_route */ 0);
3138 static clib_error_t *
3139 test_lookup_command_fn (vlib_main_t * vm,
3140 unformat_input_t * input,
3141 vlib_cli_command_t * cmd)
3147 ip4_address_t ip4_base_address;
3150 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3151 if (unformat (input, "table %d", &table_id))
3153 else if (unformat (input, "count %f", &count))
3156 else if (unformat (input, "%U",
3157 unformat_ip4_address, &ip4_base_address))
3160 return clib_error_return (0, "unknown input `%U'",
3161 format_unformat_error, input);
3166 for (i = 0; i < n; i++)
3168 if (!ip4_lookup_validate (&ip4_base_address, table_id))
3171 ip4_base_address.as_u32 =
3172 clib_host_to_net_u32 (1 +
3173 clib_net_to_host_u32 (ip4_base_address.as_u32));
3177 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
3179 vlib_cli_output (vm, "No errors in %d lookups\n", n);
3184 VLIB_CLI_COMMAND (lookup_test_command, static) = {
3185 .path = "test lookup",
3186 .short_help = "test lookup",
3187 .function = test_lookup_command_fn,
3190 int vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
3192 ip4_main_t * im4 = &ip4_main;
3194 uword * p = hash_get (im4->fib_index_by_table_id, table_id);
3197 return VNET_API_ERROR_NO_SUCH_FIB;
3199 fib = vec_elt_at_index (im4->fibs, p[0]);
3201 fib->flow_hash_config = flow_hash_config;
3205 static clib_error_t *
3206 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3207 unformat_input_t * input,
3208 vlib_cli_command_t * cmd)
3212 u32 flow_hash_config = 0;
3215 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3216 if (unformat (input, "table %d", &table_id))
3219 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3220 foreach_flow_hash_bit
3226 return clib_error_return (0, "unknown input `%U'",
3227 format_unformat_error, input);
3229 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3235 case VNET_API_ERROR_NO_SUCH_FIB:
3236 return clib_error_return (0, "no such FIB table %d", table_id);
3239 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3246 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) = {
3247 .path = "set ip flow-hash",
3249 "set ip table flow-hash table <fib-id> src dst sport dport proto reverse",
3250 .function = set_ip_flow_hash_command_fn,
3253 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3256 vnet_main_t * vnm = vnet_get_main();
3257 vnet_interface_main_t * im = &vnm->interface_main;
3258 ip4_main_t * ipm = &ip4_main;
3259 ip_lookup_main_t * lm = &ipm->lookup_main;
3260 vnet_classify_main_t * cm = &vnet_classify_main;
3262 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3263 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3265 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3266 return VNET_API_ERROR_NO_SUCH_ENTRY;
3268 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3269 lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
3274 static clib_error_t *
3275 set_ip_classify_command_fn (vlib_main_t * vm,
3276 unformat_input_t * input,
3277 vlib_cli_command_t * cmd)
3279 u32 table_index = ~0;
3280 int table_index_set = 0;
3281 u32 sw_if_index = ~0;
3284 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3285 if (unformat (input, "table-index %d", &table_index))
3286 table_index_set = 1;
3287 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3288 vnet_get_main(), &sw_if_index))
3294 if (table_index_set == 0)
3295 return clib_error_return (0, "classify table-index must be specified");
3297 if (sw_if_index == ~0)
3298 return clib_error_return (0, "interface / subif must be specified");
3300 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3307 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3308 return clib_error_return (0, "No such interface");
3310 case VNET_API_ERROR_NO_SUCH_ENTRY:
3311 return clib_error_return (0, "No such classifier table");
3316 VLIB_CLI_COMMAND (set_ip_classify_command, static) = {
3317 .path = "set ip classify",
3319 "set ip classify intfc <int> table-index <index>",
3320 .function = set_ip_classify_command_fn,