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 p = hash_get (im->fib_index_by_table_id, table_index_or_id);
108 return create_fib_with_table_id (im, table_index_or_id);
111 return vec_elt_at_index (im->fibs, fib_index);
115 ip4_fib_init_adj_index_by_dst_address (ip_lookup_main_t * lm,
122 ASSERT (lm->fib_result_n_bytes >= sizeof (uword));
123 lm->fib_result_n_words = round_pow2 (lm->fib_result_n_bytes, sizeof (uword)) / sizeof (uword);
125 fib->adj_index_by_dst_address[address_length] =
126 hash_create (32 /* elts */, lm->fib_result_n_words * sizeof (uword));
128 hash_set_flags (fib->adj_index_by_dst_address[address_length],
129 HASH_FLAG_NO_AUTO_SHRINK);
131 h = hash_header (fib->adj_index_by_dst_address[address_length]);
132 max_index = (hash_value_bytes (h) / sizeof (fib->new_hash_values[0])) - 1;
134 /* Initialize new/old hash value vectors. */
135 vec_validate_init_empty (fib->new_hash_values, max_index, ~0);
136 vec_validate_init_empty (fib->old_hash_values, max_index, ~0);
140 ip4_fib_set_adj_index (ip4_main_t * im,
144 u32 dst_address_length,
147 ip_lookup_main_t * lm = &im->lookup_main;
150 if (vec_bytes(fib->old_hash_values))
151 memset (fib->old_hash_values, ~0, vec_bytes (fib->old_hash_values));
152 if (vec_bytes(fib->new_hash_values))
153 memset (fib->new_hash_values, ~0, vec_bytes (fib->new_hash_values));
154 fib->new_hash_values[0] = adj_index;
156 /* Make sure adj index is valid. */
158 (void) ip_get_adjacency (lm, adj_index);
160 hash = fib->adj_index_by_dst_address[dst_address_length];
162 hash = _hash_set3 (hash, dst_address_u32,
163 fib->new_hash_values,
164 fib->old_hash_values);
166 fib->adj_index_by_dst_address[dst_address_length] = hash;
168 if (vec_len (im->add_del_route_callbacks) > 0)
170 ip4_add_del_route_callback_t * cb;
174 d.data_u32 = dst_address_u32;
175 vec_foreach (cb, im->add_del_route_callbacks)
176 if ((flags & cb->required_flags) == cb->required_flags)
177 cb->function (im, cb->function_opaque,
179 &d, dst_address_length,
180 fib->old_hash_values,
181 fib->new_hash_values);
183 p = hash_get (hash, dst_address_u32);
184 clib_memcpy (p, fib->new_hash_values, vec_bytes (fib->new_hash_values));
188 void ip4_add_del_route (ip4_main_t * im, ip4_add_del_route_args_t * a)
190 ip_lookup_main_t * lm = &im->lookup_main;
192 u32 dst_address, dst_address_length, adj_index, old_adj_index;
193 uword * hash, is_del;
194 ip4_add_del_route_callback_t * cb;
196 /* Either create new adjacency or use given one depending on arguments. */
197 if (a->n_add_adj > 0)
199 ip_add_adjacency (lm, a->add_adj, a->n_add_adj, &adj_index);
200 ip_call_add_del_adjacency_callbacks (lm, adj_index, /* is_del */ 0);
203 adj_index = a->adj_index;
205 dst_address = a->dst_address.data_u32;
206 dst_address_length = a->dst_address_length;
207 fib = find_ip4_fib_by_table_index_or_id (im, a->table_index_or_table_id, a->flags);
209 ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
210 dst_address &= im->fib_masks[dst_address_length];
212 if (! fib->adj_index_by_dst_address[dst_address_length])
213 ip4_fib_init_adj_index_by_dst_address (lm, fib, dst_address_length);
215 hash = fib->adj_index_by_dst_address[dst_address_length];
217 is_del = (a->flags & IP4_ROUTE_FLAG_DEL) != 0;
221 fib->old_hash_values[0] = ~0;
222 hash = _hash_unset (hash, dst_address, fib->old_hash_values);
223 fib->adj_index_by_dst_address[dst_address_length] = hash;
225 if (vec_len (im->add_del_route_callbacks) > 0
226 && fib->old_hash_values[0] != ~0) /* make sure destination was found in hash */
228 fib->new_hash_values[0] = ~0;
229 vec_foreach (cb, im->add_del_route_callbacks)
230 if ((a->flags & cb->required_flags) == cb->required_flags)
231 cb->function (im, cb->function_opaque,
233 &a->dst_address, dst_address_length,
234 fib->old_hash_values,
235 fib->new_hash_values);
239 ip4_fib_set_adj_index (im, fib, a->flags, dst_address, dst_address_length,
242 old_adj_index = fib->old_hash_values[0];
244 /* Avoid spurious reference count increments */
245 if (old_adj_index == adj_index && !(a->flags & IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY))
247 ip_adjacency_t * adj = ip_get_adjacency (lm, adj_index);
248 if (adj->share_count > 0)
252 ip4_fib_mtrie_add_del_route (fib, a->dst_address, dst_address_length,
253 is_del ? old_adj_index : adj_index,
256 /* Delete old adjacency index if present and changed. */
257 if (! (a->flags & IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY)
258 && old_adj_index != ~0
259 && old_adj_index != adj_index)
260 ip_del_adjacency (lm, old_adj_index);
264 ip4_add_del_route_next_hop (ip4_main_t * im,
266 ip4_address_t * dst_address,
267 u32 dst_address_length,
268 ip4_address_t * next_hop,
269 u32 next_hop_sw_if_index,
270 u32 next_hop_weight, u32 adj_index,
271 u32 explicit_fib_index)
273 vnet_main_t * vnm = vnet_get_main();
274 ip_lookup_main_t * lm = &im->lookup_main;
277 u32 dst_address_u32, old_mp_adj_index, new_mp_adj_index;
278 u32 dst_adj_index, nh_adj_index;
279 uword * dst_hash, * dst_result;
280 uword * nh_hash, * nh_result;
281 ip_adjacency_t * dst_adj;
282 ip_multipath_adjacency_t * old_mp, * new_mp;
283 int is_del = (flags & IP4_ROUTE_FLAG_DEL) != 0;
284 int is_interface_next_hop;
285 clib_error_t * error = 0;
287 if (explicit_fib_index == (u32)~0)
288 fib_index = vec_elt (im->fib_index_by_sw_if_index, next_hop_sw_if_index);
290 fib_index = explicit_fib_index;
292 fib = vec_elt_at_index (im->fibs, fib_index);
294 /* Lookup next hop to be added or deleted. */
295 is_interface_next_hop = next_hop->data_u32 == 0;
296 if (adj_index == (u32)~0)
298 if (is_interface_next_hop)
300 nh_result = hash_get (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index);
302 nh_adj_index = *nh_result;
305 ip_adjacency_t * adj;
306 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
308 ip4_adjacency_set_interface_route (vnm, adj, next_hop_sw_if_index, /* if_address_index */ ~0);
309 ip_call_add_del_adjacency_callbacks (lm, nh_adj_index, /* is_del */ 0);
310 hash_set (im->interface_route_adj_index_by_sw_if_index, next_hop_sw_if_index, nh_adj_index);
315 nh_hash = fib->adj_index_by_dst_address[32];
316 nh_result = hash_get (nh_hash, next_hop->data_u32);
318 /* Next hop must be known. */
321 ip_adjacency_t * adj;
323 nh_adj_index = ip4_fib_lookup_with_table (im, fib_index,
325 adj = ip_get_adjacency (lm, nh_adj_index);
326 /* if ARP interface adjacencty is present, we need to
327 install ARP adjaceny for specific next hop */
328 if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
329 adj->arp.next_hop.ip4.as_u32 == 0)
331 nh_adj_index = vnet_arp_glean_add(fib_index, next_hop);
335 vnm->api_errno = VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
336 error = clib_error_return (0, "next-hop %U/32 not in FIB",
337 format_ip4_address, next_hop);
342 nh_adj_index = *nh_result;
347 nh_adj_index = adj_index;
349 ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
350 dst_address_u32 = dst_address->data_u32 & im->fib_masks[dst_address_length];
352 dst_hash = fib->adj_index_by_dst_address[dst_address_length];
353 dst_result = hash_get (dst_hash, dst_address_u32);
356 dst_adj_index = dst_result[0];
357 dst_adj = ip_get_adjacency (lm, dst_adj_index);
361 /* For deletes destination must be known. */
364 vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
365 error = clib_error_return (0, "unknown destination %U/%d",
366 format_ip4_address, dst_address,
375 /* Ignore adds of X/32 with next hop of X. */
377 && dst_address_length == 32
378 && dst_address->data_u32 == next_hop->data_u32
379 && adj_index != (u32)~0)
381 vnm->api_errno = VNET_API_ERROR_PREFIX_MATCHES_NEXT_HOP;
382 error = clib_error_return (0, "prefix matches next hop %U/%d",
383 format_ip4_address, dst_address,
388 /* Destination is not known and default weight is set so add route
389 to existing non-multipath adjacency */
390 if (dst_adj_index == ~0 && next_hop_weight == 1 && next_hop_sw_if_index == ~0)
392 /* create new adjacency */
393 ip4_add_del_route_args_t a;
394 a.table_index_or_table_id = fib_index;
395 a.flags = ((is_del ? IP4_ROUTE_FLAG_DEL : IP4_ROUTE_FLAG_ADD)
396 | IP4_ROUTE_FLAG_FIB_INDEX
397 | IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY
398 | (flags & (IP4_ROUTE_FLAG_NO_REDISTRIBUTE
399 | IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
400 a.dst_address = dst_address[0];
401 a.dst_address_length = dst_address_length;
402 a.adj_index = nh_adj_index;
406 ip4_add_del_route (im, &a);
411 old_mp_adj_index = dst_adj ? dst_adj->heap_handle : ~0;
413 if (! ip_multipath_adjacency_add_del_next_hop
420 vnm->api_errno = VNET_API_ERROR_NEXT_HOP_NOT_FOUND_MP;
421 error = clib_error_return (0, "requested deleting next-hop %U not found in multi-path",
422 format_ip4_address, next_hop);
427 if (old_mp_adj_index != ~0)
428 old_mp = vec_elt_at_index (lm->multipath_adjacencies, old_mp_adj_index);
429 if (new_mp_adj_index != ~0)
430 new_mp = vec_elt_at_index (lm->multipath_adjacencies, new_mp_adj_index);
432 if (old_mp != new_mp)
434 ip4_add_del_route_args_t a;
435 a.table_index_or_table_id = fib_index;
436 a.flags = ((is_del && ! new_mp ? IP4_ROUTE_FLAG_DEL : IP4_ROUTE_FLAG_ADD)
437 | IP4_ROUTE_FLAG_FIB_INDEX
438 | IP4_ROUTE_FLAG_KEEP_OLD_ADJACENCY
439 | (flags & (IP4_ROUTE_FLAG_NO_REDISTRIBUTE | IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
440 a.dst_address = dst_address[0];
441 a.dst_address_length = dst_address_length;
442 a.adj_index = new_mp ? new_mp->adj_index : dst_adj_index;
446 ip4_add_del_route (im, &a);
451 clib_error_report (error);
455 ip4_get_route (ip4_main_t * im,
456 u32 table_index_or_table_id,
461 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
462 u32 dst_address = * (u32 *) address;
465 ASSERT (address_length < ARRAY_LEN (im->fib_masks));
466 dst_address &= im->fib_masks[address_length];
468 hash = fib->adj_index_by_dst_address[address_length];
469 p = hash_get (hash, dst_address);
474 ip4_foreach_matching_route (ip4_main_t * im,
475 u32 table_index_or_table_id,
477 ip4_address_t * address,
479 ip4_address_t ** results,
480 u8 ** result_lengths)
482 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
483 u32 dst_address = address->data_u32;
484 u32 this_length = address_length;
487 _vec_len (*results) = 0;
489 _vec_len (*result_lengths) = 0;
491 while (this_length <= 32 && vec_len (results) == 0)
494 hash_foreach (k, v, fib->adj_index_by_dst_address[this_length], ({
495 if (0 == ((k ^ dst_address) & im->fib_masks[address_length]))
499 vec_add1 (*results, a);
500 vec_add1 (*result_lengths, this_length);
508 void ip4_maybe_remap_adjacencies (ip4_main_t * im,
509 u32 table_index_or_table_id,
512 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
513 ip_lookup_main_t * lm = &im->lookup_main;
516 ip4_add_del_route_callback_t * cb;
517 static ip4_address_t * to_delete;
519 if (lm->n_adjacency_remaps == 0)
522 for (l = 0; l <= 32; l++)
525 uword * hash = fib->adj_index_by_dst_address[l];
527 if (hash_elts (hash) == 0)
531 _vec_len (to_delete) = 0;
533 hash_foreach_pair (p, hash, ({
534 u32 adj_index = p->value[0];
535 u32 m = vec_elt (lm->adjacency_remap_table, adj_index);
539 /* Record destination address from hash key. */
542 /* New adjacency points to nothing: so delete prefix. */
544 vec_add1 (to_delete, a);
547 /* Remap to new adjacency. */
548 clib_memcpy (fib->old_hash_values, p->value, vec_bytes (fib->old_hash_values));
550 /* Set new adjacency value. */
551 fib->new_hash_values[0] = p->value[0] = m - 1;
553 vec_foreach (cb, im->add_del_route_callbacks)
554 if ((flags & cb->required_flags) == cb->required_flags)
555 cb->function (im, cb->function_opaque,
556 fib, flags | IP4_ROUTE_FLAG_ADD,
558 fib->old_hash_values,
559 fib->new_hash_values);
564 fib->new_hash_values[0] = ~0;
565 for (i = 0; i < vec_len (to_delete); i++)
567 hash = _hash_unset (hash, to_delete[i].data_u32, fib->old_hash_values);
568 vec_foreach (cb, im->add_del_route_callbacks)
569 if ((flags & cb->required_flags) == cb->required_flags)
570 cb->function (im, cb->function_opaque,
571 fib, flags | IP4_ROUTE_FLAG_DEL,
573 fib->old_hash_values,
574 fib->new_hash_values);
578 /* Also remap adjacencies in mtrie. */
579 ip4_mtrie_maybe_remap_adjacencies (lm, &fib->mtrie);
581 /* Reset mapping table. */
582 vec_zero (lm->adjacency_remap_table);
584 /* All remaps have been performed. */
585 lm->n_adjacency_remaps = 0;
588 void ip4_delete_matching_routes (ip4_main_t * im,
589 u32 table_index_or_table_id,
591 ip4_address_t * address,
594 static ip4_address_t * matching_addresses;
595 static u8 * matching_address_lengths;
597 ip4_add_del_route_args_t a;
599 a.flags = IP4_ROUTE_FLAG_DEL | IP4_ROUTE_FLAG_NO_REDISTRIBUTE | flags;
600 a.table_index_or_table_id = table_index_or_table_id;
605 for (l = address_length + 1; l <= 32; l++)
607 ip4_foreach_matching_route (im, table_index_or_table_id, flags,
611 &matching_address_lengths);
612 for (i = 0; i < vec_len (matching_addresses); i++)
614 a.dst_address = matching_addresses[i];
615 a.dst_address_length = matching_address_lengths[i];
616 ip4_add_del_route (im, &a);
620 ip4_maybe_remap_adjacencies (im, table_index_or_table_id, flags);
624 ip4_lookup_inline (vlib_main_t * vm,
625 vlib_node_runtime_t * node,
626 vlib_frame_t * frame,
627 int lookup_for_responses_to_locally_received_packets)
629 ip4_main_t * im = &ip4_main;
630 ip_lookup_main_t * lm = &im->lookup_main;
631 vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
632 u32 n_left_from, n_left_to_next, * from, * to_next;
633 ip_lookup_next_t next;
634 u32 cpu_index = os_get_cpu_number();
636 from = vlib_frame_vector_args (frame);
637 n_left_from = frame->n_vectors;
638 next = node->cached_next_index;
640 while (n_left_from > 0)
642 vlib_get_next_frame (vm, node, next,
643 to_next, n_left_to_next);
645 while (n_left_from >= 4 && n_left_to_next >= 2)
647 vlib_buffer_t * p0, * p1;
648 ip4_header_t * ip0, * ip1;
649 __attribute__((unused)) tcp_header_t * tcp0, * tcp1;
650 ip_lookup_next_t next0, next1;
651 ip_adjacency_t * adj0, * adj1;
652 ip4_fib_mtrie_t * mtrie0, * mtrie1;
653 ip4_fib_mtrie_leaf_t leaf0, leaf1;
654 __attribute__((unused)) u32 pi0, fib_index0, adj_index0, is_tcp_udp0;
655 __attribute__((unused)) u32 pi1, fib_index1, adj_index1, is_tcp_udp1;
656 u32 flow_hash_config0, flow_hash_config1;
657 u32 hash_c0, hash_c1;
660 /* Prefetch next iteration. */
662 vlib_buffer_t * p2, * p3;
664 p2 = vlib_get_buffer (vm, from[2]);
665 p3 = vlib_get_buffer (vm, from[3]);
667 vlib_prefetch_buffer_header (p2, LOAD);
668 vlib_prefetch_buffer_header (p3, LOAD);
670 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
671 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
674 pi0 = to_next[0] = from[0];
675 pi1 = to_next[1] = from[1];
677 p0 = vlib_get_buffer (vm, pi0);
678 p1 = vlib_get_buffer (vm, pi1);
680 ip0 = vlib_buffer_get_current (p0);
681 ip1 = vlib_buffer_get_current (p1);
683 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
684 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
685 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
686 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
687 fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
688 fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
691 if (! lookup_for_responses_to_locally_received_packets)
693 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
694 mtrie1 = &vec_elt_at_index (im->fibs, fib_index1)->mtrie;
696 leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
698 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 0);
699 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->dst_address, 0);
702 tcp0 = (void *) (ip0 + 1);
703 tcp1 = (void *) (ip1 + 1);
705 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
706 || ip0->protocol == IP_PROTOCOL_UDP);
707 is_tcp_udp1 = (ip1->protocol == IP_PROTOCOL_TCP
708 || ip1->protocol == IP_PROTOCOL_UDP);
710 if (! lookup_for_responses_to_locally_received_packets)
712 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 1);
713 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->dst_address, 1);
716 if (! lookup_for_responses_to_locally_received_packets)
718 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 2);
719 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->dst_address, 2);
722 if (! lookup_for_responses_to_locally_received_packets)
724 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 3);
725 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->dst_address, 3);
728 if (lookup_for_responses_to_locally_received_packets)
730 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
731 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
735 /* Handle default route. */
736 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
737 leaf1 = (leaf1 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie1->default_leaf : leaf1);
739 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
740 adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
743 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
745 /* no_default_route */ 0));
746 ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, fib_index1,
748 /* no_default_route */ 0));
749 adj0 = ip_get_adjacency (lm, adj_index0);
750 adj1 = ip_get_adjacency (lm, adj_index1);
752 next0 = adj0->lookup_next_index;
753 next1 = adj1->lookup_next_index;
755 /* Use flow hash to compute multipath adjacency. */
756 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
757 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
758 if (PREDICT_FALSE (adj0->n_adj > 1))
761 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
762 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
763 ip4_compute_flow_hash (ip0, flow_hash_config0);
765 if (PREDICT_FALSE(adj1->n_adj > 1))
768 vec_elt_at_index (im->fibs, fib_index1)->flow_hash_config;
769 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
770 ip4_compute_flow_hash (ip1, flow_hash_config1);
773 ASSERT (adj0->n_adj > 0);
774 ASSERT (adj1->n_adj > 0);
775 ASSERT (is_pow2 (adj0->n_adj));
776 ASSERT (is_pow2 (adj1->n_adj));
777 adj_index0 += (hash_c0 & (adj0->n_adj - 1));
778 adj_index1 += (hash_c1 & (adj1->n_adj - 1));
780 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
781 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
783 vlib_increment_combined_counter
784 (cm, cpu_index, adj_index0, 1,
785 vlib_buffer_length_in_chain (vm, p0)
786 + sizeof(ethernet_header_t));
787 vlib_increment_combined_counter
788 (cm, cpu_index, adj_index1, 1,
789 vlib_buffer_length_in_chain (vm, p1)
790 + sizeof(ethernet_header_t));
797 wrong_next = (next0 != next) + 2*(next1 != next);
798 if (PREDICT_FALSE (wrong_next != 0))
807 vlib_set_next_frame_buffer (vm, node, next0, pi0);
814 vlib_set_next_frame_buffer (vm, node, next1, pi1);
821 vlib_set_next_frame_buffer (vm, node, next0, pi0);
822 vlib_set_next_frame_buffer (vm, node, next1, pi1);
826 vlib_put_next_frame (vm, node, next, n_left_to_next);
828 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
834 while (n_left_from > 0 && n_left_to_next > 0)
838 __attribute__((unused)) tcp_header_t * tcp0;
839 ip_lookup_next_t next0;
840 ip_adjacency_t * adj0;
841 ip4_fib_mtrie_t * mtrie0;
842 ip4_fib_mtrie_leaf_t leaf0;
843 __attribute__((unused)) u32 pi0, fib_index0, adj_index0, is_tcp_udp0;
844 u32 flow_hash_config0, hash_c0;
849 p0 = vlib_get_buffer (vm, pi0);
851 ip0 = vlib_buffer_get_current (p0);
853 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
854 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
855 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
857 if (! lookup_for_responses_to_locally_received_packets)
859 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
861 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
863 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 0);
866 tcp0 = (void *) (ip0 + 1);
868 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
869 || ip0->protocol == IP_PROTOCOL_UDP);
871 if (! lookup_for_responses_to_locally_received_packets)
872 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 1);
874 if (! lookup_for_responses_to_locally_received_packets)
875 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 2);
877 if (! lookup_for_responses_to_locally_received_packets)
878 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->dst_address, 3);
880 if (lookup_for_responses_to_locally_received_packets)
881 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
884 /* Handle default route. */
885 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
886 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
889 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
891 /* no_default_route */ 0));
893 adj0 = ip_get_adjacency (lm, adj_index0);
895 next0 = adj0->lookup_next_index;
897 /* Use flow hash to compute multipath adjacency. */
898 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
899 if (PREDICT_FALSE(adj0->n_adj > 1))
902 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
904 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
905 ip4_compute_flow_hash (ip0, flow_hash_config0);
908 ASSERT (adj0->n_adj > 0);
909 ASSERT (is_pow2 (adj0->n_adj));
910 adj_index0 += (hash_c0 & (adj0->n_adj - 1));
912 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
914 vlib_increment_combined_counter
915 (cm, cpu_index, adj_index0, 1,
916 vlib_buffer_length_in_chain (vm, p0)
917 + sizeof(ethernet_header_t));
924 if (PREDICT_FALSE (next0 != next))
927 vlib_put_next_frame (vm, node, next, n_left_to_next);
929 vlib_get_next_frame (vm, node, next,
930 to_next, n_left_to_next);
937 vlib_put_next_frame (vm, node, next, n_left_to_next);
940 return frame->n_vectors;
944 ip4_lookup (vlib_main_t * vm,
945 vlib_node_runtime_t * node,
946 vlib_frame_t * frame)
948 return ip4_lookup_inline (vm, node, frame, /* lookup_for_responses_to_locally_received_packets */ 0);
952 void ip4_adjacency_set_interface_route (vnet_main_t * vnm,
953 ip_adjacency_t * adj,
955 u32 if_address_index)
957 vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
959 vnet_l3_packet_type_t packet_type;
962 if (hw->hw_class_index == ethernet_hw_interface_class.index
963 || hw->hw_class_index == srp_hw_interface_class.index)
966 * We have a bit of a problem in this case. ip4-arp uses
967 * the rewrite_header.next_index to hand pkts to the
968 * indicated inteface output node. We can end up in
969 * ip4_rewrite_local, too, which also pays attention to
970 * rewrite_header.next index. Net result: a hack in
971 * ip4_rewrite_local...
973 n = IP_LOOKUP_NEXT_ARP;
974 node_index = ip4_arp_node.index;
975 adj->if_address_index = if_address_index;
976 adj->arp.next_hop.ip4.as_u32 = 0;
977 packet_type = VNET_L3_PACKET_TYPE_ARP;
981 n = IP_LOOKUP_NEXT_REWRITE;
982 node_index = ip4_rewrite_node.index;
983 packet_type = VNET_L3_PACKET_TYPE_IP4;
986 adj->lookup_next_index = n;
987 vnet_rewrite_for_sw_interface
992 VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST,
993 &adj->rewrite_header,
994 sizeof (adj->rewrite_data));
998 ip4_add_interface_routes (u32 sw_if_index,
999 ip4_main_t * im, u32 fib_index,
1000 ip_interface_address_t * a)
1002 vnet_main_t * vnm = vnet_get_main();
1003 ip_lookup_main_t * lm = &im->lookup_main;
1004 ip_adjacency_t * adj;
1005 ip4_address_t * address = ip_interface_address_get_address (lm, a);
1006 ip4_add_del_route_args_t x;
1007 vnet_hw_interface_t * hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
1008 u32 classify_table_index;
1010 /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1011 x.table_index_or_table_id = fib_index;
1012 x.flags = (IP4_ROUTE_FLAG_ADD
1013 | IP4_ROUTE_FLAG_FIB_INDEX
1014 | IP4_ROUTE_FLAG_NO_REDISTRIBUTE);
1015 x.dst_address = address[0];
1016 x.dst_address_length = a->address_length;
1020 a->neighbor_probe_adj_index = ~0;
1021 if (a->address_length < 32)
1023 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1025 ip4_adjacency_set_interface_route (vnm, adj, sw_if_index, a - lm->if_address_pool);
1026 ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1027 ip4_add_del_route (im, &x);
1028 a->neighbor_probe_adj_index = x.adj_index;
1031 /* Add e.g. 1.1.1.1/32 as local to this host. */
1032 adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1035 classify_table_index = ~0;
1036 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
1037 classify_table_index = lm->classify_table_index_by_sw_if_index [sw_if_index];
1038 if (classify_table_index != (u32) ~0)
1040 adj->lookup_next_index = IP_LOOKUP_NEXT_CLASSIFY;
1041 adj->classify.table_index = classify_table_index;
1044 adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
1046 adj->if_address_index = a - lm->if_address_pool;
1047 adj->rewrite_header.sw_if_index = sw_if_index;
1048 adj->rewrite_header.max_l3_packet_bytes = hw_if->max_l3_packet_bytes[VLIB_RX];
1050 * Local adjs are never to be rewritten. Spoofed pkts w/ src = dst = local
1051 * fail an RPF-ish check, but still go thru the rewrite code...
1053 adj->rewrite_header.data_bytes = 0;
1055 ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1056 x.dst_address_length = 32;
1057 ip4_add_del_route (im, &x);
1061 ip4_del_interface_routes (ip4_main_t * im, u32 fib_index, ip4_address_t * address, u32 address_length)
1063 ip4_add_del_route_args_t x;
1065 /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1066 x.table_index_or_table_id = fib_index;
1067 x.flags = (IP4_ROUTE_FLAG_DEL
1068 | IP4_ROUTE_FLAG_FIB_INDEX
1069 | IP4_ROUTE_FLAG_NO_REDISTRIBUTE);
1070 x.dst_address = address[0];
1071 x.dst_address_length = address_length;
1076 if (address_length < 32)
1077 ip4_add_del_route (im, &x);
1079 x.dst_address_length = 32;
1080 ip4_add_del_route (im, &x);
1082 ip4_delete_matching_routes (im,
1084 IP4_ROUTE_FLAG_FIB_INDEX,
1091 ip4_address_t address;
1093 } ip4_interface_address_t;
1095 static clib_error_t *
1096 ip4_add_del_interface_address_internal (vlib_main_t * vm,
1098 ip4_address_t * new_address,
1104 static clib_error_t *
1105 ip4_add_del_interface_address_internal (vlib_main_t * vm,
1107 ip4_address_t * address,
1113 vnet_main_t * vnm = vnet_get_main();
1114 ip4_main_t * im = &ip4_main;
1115 ip_lookup_main_t * lm = &im->lookup_main;
1116 clib_error_t * error = 0;
1117 u32 if_address_index, elts_before;
1118 ip4_address_fib_t ip4_af, * addr_fib = 0;
1120 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1121 ip4_addr_fib_init (&ip4_af, address,
1122 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
1123 vec_add1 (addr_fib, ip4_af);
1125 /* When adding an address check that it does not conflict with an existing address. */
1128 ip_interface_address_t * ia;
1129 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1130 0 /* honor unnumbered */,
1132 ip4_address_t * x = ip_interface_address_get_address (&im->lookup_main, ia);
1134 if (ip4_destination_matches_route (im, address, x, ia->address_length)
1135 || ip4_destination_matches_route (im, x, address, address_length))
1136 return clib_error_create ("failed to add %U which conflicts with %U for interface %U",
1137 format_ip4_address_and_length, address, address_length,
1138 format_ip4_address_and_length, x, ia->address_length,
1139 format_vnet_sw_if_index_name, vnm, sw_if_index);
1143 elts_before = pool_elts (lm->if_address_pool);
1145 error = ip_interface_address_add_del
1155 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index) && insert_routes)
1158 ip4_del_interface_routes (im, ip4_af.fib_index, address,
1162 ip4_add_interface_routes (sw_if_index,
1163 im, ip4_af.fib_index,
1165 (lm->if_address_pool, if_address_index));
1168 /* If pool did not grow/shrink: add duplicate address. */
1169 if (elts_before != pool_elts (lm->if_address_pool))
1171 ip4_add_del_interface_address_callback_t * cb;
1172 vec_foreach (cb, im->add_del_interface_address_callbacks)
1173 cb->function (im, cb->function_opaque, sw_if_index,
1174 address, address_length,
1180 vec_free (addr_fib);
1185 ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
1186 ip4_address_t * address, u32 address_length,
1189 return ip4_add_del_interface_address_internal
1190 (vm, sw_if_index, address, address_length,
1191 /* redistribute */ 1,
1192 /* insert_routes */ 1,
1196 static clib_error_t *
1197 ip4_sw_interface_admin_up_down (vnet_main_t * vnm,
1201 ip4_main_t * im = &ip4_main;
1202 ip_interface_address_t * ia;
1204 u32 is_admin_up, fib_index;
1206 /* Fill in lookup tables with default table (0). */
1207 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1209 vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
1211 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
1213 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
1215 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1216 0 /* honor unnumbered */,
1218 a = ip_interface_address_get_address (&im->lookup_main, ia);
1220 ip4_add_interface_routes (sw_if_index,
1224 ip4_del_interface_routes (im, fib_index,
1225 a, ia->address_length);
1231 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
1233 static clib_error_t *
1234 ip4_sw_interface_add_del (vnet_main_t * vnm,
1238 vlib_main_t * vm = vnm->vlib_main;
1239 ip4_main_t * im = &ip4_main;
1240 ip_lookup_main_t * lm = &im->lookup_main;
1243 for (cast = 0; cast < VNET_N_CAST; cast++)
1245 ip_config_main_t * cm = &lm->rx_config_mains[cast];
1246 vnet_config_main_t * vcm = &cm->config_main;
1248 if (! vcm->node_index_by_feature_index)
1250 if (cast == VNET_UNICAST)
1252 static char * start_nodes[] = { "ip4-input", "ip4-input-no-checksum", };
1253 static char * feature_nodes[] = {
1254 [IP4_RX_FEATURE_CHECK_ACCESS] = "ip4-inacl",
1255 [IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_RX] = "ip4-source-check-via-rx",
1256 [IP4_RX_FEATURE_SOURCE_CHECK_REACHABLE_VIA_ANY] = "ip4-source-check-via-any",
1257 [IP4_RX_FEATURE_IPSEC] = "ipsec-input-ip4",
1258 [IP4_RX_FEATURE_VPATH] = "vpath-input-ip4",
1259 [IP4_RX_FEATURE_LOOKUP] = "ip4-lookup",
1262 vnet_config_init (vm, vcm,
1263 start_nodes, ARRAY_LEN (start_nodes),
1264 feature_nodes, ARRAY_LEN (feature_nodes));
1268 static char * start_nodes[] = { "ip4-input", "ip4-input-no-checksum", };
1269 static char * feature_nodes[] = {
1270 [IP4_RX_FEATURE_VPATH] = "vpath-input-ip4",
1271 [IP4_RX_FEATURE_LOOKUP] = "ip4-lookup-multicast",
1274 vnet_config_init (vm, vcm,
1275 start_nodes, ARRAY_LEN (start_nodes),
1276 feature_nodes, ARRAY_LEN (feature_nodes));
1280 vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
1281 ci = cm->config_index_by_sw_if_index[sw_if_index];
1284 ci = vnet_config_add_feature (vm, vcm,
1286 IP4_RX_FEATURE_LOOKUP,
1287 /* config data */ 0,
1288 /* # bytes of config data */ 0);
1290 ci = vnet_config_del_feature (vm, vcm,
1292 IP4_RX_FEATURE_LOOKUP,
1293 /* config data */ 0,
1294 /* # bytes of config data */ 0);
1296 cm->config_index_by_sw_if_index[sw_if_index] = ci;
1299 return /* no error */ 0;
1302 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1305 VLIB_REGISTER_NODE (ip4_lookup_node) = {
1306 .function = ip4_lookup,
1307 .name = "ip4-lookup",
1308 .vector_size = sizeof (u32),
1310 .n_next_nodes = IP_LOOKUP_N_NEXT,
1311 .next_nodes = IP4_LOOKUP_NEXT_NODES,
1314 /* Global IP4 main. */
1315 ip4_main_t ip4_main;
1318 ip4_lookup_init (vlib_main_t * vm)
1320 ip4_main_t * im = &ip4_main;
1323 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1328 m = pow2_mask (i) << (32 - i);
1331 im->fib_masks[i] = clib_host_to_net_u32 (m);
1334 /* Create FIB with index 0 and table id of 0. */
1335 find_ip4_fib_by_table_index_or_id (im, /* table id */ 0, IP4_ROUTE_FLAG_TABLE_ID);
1337 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1341 pn = pg_get_node (ip4_lookup_node.index);
1342 pn->unformat_edit = unformat_pg_ip4_header;
1346 ethernet_arp_header_t h;
1348 memset (&h, 0, sizeof (h));
1350 /* Set target ethernet address to all zeros. */
1351 memset (h.ip4_over_ethernet[1].ethernet, 0, sizeof (h.ip4_over_ethernet[1].ethernet));
1353 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1354 #define _8(f,v) h.f = v;
1355 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1356 _16 (l3_type, ETHERNET_TYPE_IP4);
1357 _8 (n_l2_address_bytes, 6);
1358 _8 (n_l3_address_bytes, 4);
1359 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1363 vlib_packet_template_init (vm,
1364 &im->ip4_arp_request_packet_template,
1367 /* alloc chunk size */ 8,
1374 VLIB_INIT_FUNCTION (ip4_lookup_init);
1377 /* Adjacency taken. */
1382 /* Packet data, possibly *after* rewrite. */
1383 u8 packet_data[64 - 1*sizeof(u32)];
1384 } ip4_forward_next_trace_t;
1386 static u8 * format_ip4_forward_next_trace (u8 * s, va_list * args)
1388 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1389 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1390 ip4_forward_next_trace_t * t = va_arg (*args, ip4_forward_next_trace_t *);
1391 vnet_main_t * vnm = vnet_get_main();
1392 ip4_main_t * im = &ip4_main;
1393 ip_adjacency_t * adj;
1394 uword indent = format_get_indent (s);
1396 adj = ip_get_adjacency (&im->lookup_main, t->adj_index);
1397 s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
1398 t->fib_index, t->adj_index, format_ip_adjacency,
1399 vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1400 switch (adj->lookup_next_index)
1402 case IP_LOOKUP_NEXT_REWRITE:
1403 s = format (s, "\n%U%U",
1404 format_white_space, indent,
1405 format_ip_adjacency_packet_data,
1406 vnm, &im->lookup_main, t->adj_index,
1407 t->packet_data, sizeof (t->packet_data));
1417 /* Common trace function for all ip4-forward next nodes. */
1419 ip4_forward_next_trace (vlib_main_t * vm,
1420 vlib_node_runtime_t * node,
1421 vlib_frame_t * frame,
1422 vlib_rx_or_tx_t which_adj_index)
1425 ip4_main_t * im = &ip4_main;
1427 n_left = frame->n_vectors;
1428 from = vlib_frame_vector_args (frame);
1433 vlib_buffer_t * b0, * b1;
1434 ip4_forward_next_trace_t * t0, * t1;
1436 /* Prefetch next iteration. */
1437 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1438 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1443 b0 = vlib_get_buffer (vm, bi0);
1444 b1 = vlib_get_buffer (vm, bi1);
1446 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1448 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1449 t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1450 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1451 t0->fib_index = vec_elt (im->fib_index_by_sw_if_index,
1452 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1453 clib_memcpy (t0->packet_data,
1454 vlib_buffer_get_current (b0),
1455 sizeof (t0->packet_data));
1457 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1459 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1460 t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1461 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1462 t1->fib_index = vec_elt (im->fib_index_by_sw_if_index,
1463 vnet_buffer(b1)->sw_if_index[VLIB_RX]);
1464 clib_memcpy (t1->packet_data,
1465 vlib_buffer_get_current (b1),
1466 sizeof (t1->packet_data));
1476 ip4_forward_next_trace_t * t0;
1480 b0 = vlib_get_buffer (vm, bi0);
1482 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1484 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1485 t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1486 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1487 t0->fib_index = vec_elt (im->fib_index_by_sw_if_index,
1488 vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1489 clib_memcpy (t0->packet_data,
1490 vlib_buffer_get_current (b0),
1491 sizeof (t0->packet_data));
1499 ip4_drop_or_punt (vlib_main_t * vm,
1500 vlib_node_runtime_t * node,
1501 vlib_frame_t * frame,
1502 ip4_error_t error_code)
1504 u32 * buffers = vlib_frame_vector_args (frame);
1505 uword n_packets = frame->n_vectors;
1507 vlib_error_drop_buffers (vm, node,
1512 ip4_input_node.index,
1515 if (node->flags & VLIB_NODE_FLAG_TRACE)
1516 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1522 ip4_drop (vlib_main_t * vm,
1523 vlib_node_runtime_t * node,
1524 vlib_frame_t * frame)
1525 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP); }
1528 ip4_punt (vlib_main_t * vm,
1529 vlib_node_runtime_t * node,
1530 vlib_frame_t * frame)
1531 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT); }
1534 ip4_miss (vlib_main_t * vm,
1535 vlib_node_runtime_t * node,
1536 vlib_frame_t * frame)
1537 { return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_DST_LOOKUP_MISS); }
1539 VLIB_REGISTER_NODE (ip4_drop_node,static) = {
1540 .function = ip4_drop,
1542 .vector_size = sizeof (u32),
1544 .format_trace = format_ip4_forward_next_trace,
1552 VLIB_REGISTER_NODE (ip4_punt_node,static) = {
1553 .function = ip4_punt,
1555 .vector_size = sizeof (u32),
1557 .format_trace = format_ip4_forward_next_trace,
1565 VLIB_REGISTER_NODE (ip4_miss_node,static) = {
1566 .function = ip4_miss,
1568 .vector_size = sizeof (u32),
1570 .format_trace = format_ip4_forward_next_trace,
1578 /* Compute TCP/UDP/ICMP4 checksum in software. */
1580 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1584 u32 ip_header_length, payload_length_host_byte_order;
1585 u32 n_this_buffer, n_bytes_left;
1587 void * data_this_buffer;
1589 /* Initialize checksum with ip header. */
1590 ip_header_length = ip4_header_bytes (ip0);
1591 payload_length_host_byte_order = clib_net_to_host_u16 (ip0->length) - ip_header_length;
1592 sum0 = clib_host_to_net_u32 (payload_length_host_byte_order + (ip0->protocol << 16));
1594 if (BITS (uword) == 32)
1596 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u32));
1597 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->dst_address, u32));
1600 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1602 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1603 data_this_buffer = (void *) ip0 + ip_header_length;
1604 if (n_this_buffer + ip_header_length > p0->current_length)
1605 n_this_buffer = p0->current_length > ip_header_length ? p0->current_length - ip_header_length : 0;
1608 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1609 n_bytes_left -= n_this_buffer;
1610 if (n_bytes_left == 0)
1613 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1614 p0 = vlib_get_buffer (vm, p0->next_buffer);
1615 data_this_buffer = vlib_buffer_get_current (p0);
1616 n_this_buffer = p0->current_length;
1619 sum16 = ~ ip_csum_fold (sum0);
1625 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1627 ip4_header_t * ip0 = vlib_buffer_get_current (p0);
1628 udp_header_t * udp0;
1631 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1632 || ip0->protocol == IP_PROTOCOL_UDP);
1634 udp0 = (void *) (ip0 + 1);
1635 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1637 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1638 | IP_BUFFER_L4_CHECKSUM_CORRECT);
1642 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1644 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1645 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1651 ip4_local (vlib_main_t * vm,
1652 vlib_node_runtime_t * node,
1653 vlib_frame_t * frame)
1655 ip4_main_t * im = &ip4_main;
1656 ip_lookup_main_t * lm = &im->lookup_main;
1657 ip_local_next_t next_index;
1658 u32 * from, * to_next, n_left_from, n_left_to_next;
1659 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
1661 from = vlib_frame_vector_args (frame);
1662 n_left_from = frame->n_vectors;
1663 next_index = node->cached_next_index;
1665 if (node->flags & VLIB_NODE_FLAG_TRACE)
1666 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1668 while (n_left_from > 0)
1670 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1672 while (n_left_from >= 4 && n_left_to_next >= 2)
1674 vlib_buffer_t * p0, * p1;
1675 ip4_header_t * ip0, * ip1;
1676 udp_header_t * udp0, * udp1;
1677 ip4_fib_mtrie_t * mtrie0, * mtrie1;
1678 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1679 ip_adjacency_t * adj0, * adj1;
1680 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, adj_index0;
1681 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, adj_index1;
1682 i32 len_diff0, len_diff1;
1683 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1684 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1687 pi0 = to_next[0] = from[0];
1688 pi1 = to_next[1] = from[1];
1692 n_left_to_next -= 2;
1694 p0 = vlib_get_buffer (vm, pi0);
1695 p1 = vlib_get_buffer (vm, pi1);
1697 ip0 = vlib_buffer_get_current (p0);
1698 ip1 = vlib_buffer_get_current (p1);
1700 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
1701 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
1702 fib_index1 = vec_elt (im->fib_index_by_sw_if_index,
1703 vnet_buffer(p1)->sw_if_index[VLIB_RX]);
1705 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
1706 mtrie1 = &vec_elt_at_index (im->fibs, fib_index1)->mtrie;
1708 leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
1710 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1711 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 0);
1713 proto0 = ip0->protocol;
1714 proto1 = ip1->protocol;
1715 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1716 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1717 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1718 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1723 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1724 good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1726 udp0 = ip4_next_header (ip0);
1727 udp1 = ip4_next_header (ip1);
1729 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1730 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1731 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1733 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1734 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 1);
1736 /* Verify UDP length. */
1737 ip_len0 = clib_net_to_host_u16 (ip0->length);
1738 ip_len1 = clib_net_to_host_u16 (ip1->length);
1739 udp_len0 = clib_net_to_host_u16 (udp0->length);
1740 udp_len1 = clib_net_to_host_u16 (udp1->length);
1742 len_diff0 = ip_len0 - udp_len0;
1743 len_diff1 = ip_len1 - udp_len1;
1745 len_diff0 = is_udp0 ? len_diff0 : 0;
1746 len_diff1 = is_udp1 ? len_diff1 : 0;
1748 if (PREDICT_FALSE (! (is_tcp_udp0 & is_tcp_udp1
1749 & good_tcp_udp0 & good_tcp_udp1)))
1754 && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1755 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1757 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1758 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1763 && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1764 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1766 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1767 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1771 good_tcp_udp0 &= len_diff0 >= 0;
1772 good_tcp_udp1 &= len_diff1 >= 0;
1774 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1775 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1777 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1779 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1780 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1782 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1783 error0 = (is_tcp_udp0 && ! good_tcp_udp0
1784 ? IP4_ERROR_TCP_CHECKSUM + is_udp0
1786 error1 = (is_tcp_udp1 && ! good_tcp_udp1
1787 ? IP4_ERROR_TCP_CHECKSUM + is_udp1
1790 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1791 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1793 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1794 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
1796 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = adj_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1797 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
1799 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
1801 /* no_default_route */ 1));
1802 ASSERT (adj_index1 == ip4_fib_lookup_with_table (im, fib_index1,
1804 /* no_default_route */ 1));
1806 adj0 = ip_get_adjacency (lm, adj_index0);
1807 adj1 = ip_get_adjacency (lm, adj_index1);
1810 * Must have a route to source otherwise we drop the packet.
1811 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1813 error0 = (error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1814 && adj0->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
1815 && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP
1816 && adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
1817 && ip0->dst_address.as_u32 != 0xFFFFFFFF
1818 ? IP4_ERROR_SRC_LOOKUP_MISS
1820 error1 = (error1 == IP4_ERROR_UNKNOWN_PROTOCOL
1821 && adj1->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
1822 && adj1->lookup_next_index != IP_LOOKUP_NEXT_ARP
1823 && adj1->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
1824 && ip0->dst_address.as_u32 != 0xFFFFFFFF
1825 ? IP4_ERROR_SRC_LOOKUP_MISS
1828 next0 = lm->local_next_by_ip_protocol[proto0];
1829 next1 = lm->local_next_by_ip_protocol[proto1];
1831 next0 = error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1832 next1 = error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1834 p0->error = error0 ? error_node->errors[error0] : 0;
1835 p1->error = error1 ? error_node->errors[error1] : 0;
1837 enqueue_code = (next0 != next_index) + 2*(next1 != next_index);
1839 if (PREDICT_FALSE (enqueue_code != 0))
1841 switch (enqueue_code)
1847 n_left_to_next += 1;
1848 vlib_set_next_frame_buffer (vm, node, next0, pi0);
1854 n_left_to_next += 1;
1855 vlib_set_next_frame_buffer (vm, node, next1, pi1);
1859 /* A B B or A B C */
1861 n_left_to_next += 2;
1862 vlib_set_next_frame_buffer (vm, node, next0, pi0);
1863 vlib_set_next_frame_buffer (vm, node, next1, pi1);
1866 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1868 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1875 while (n_left_from > 0 && n_left_to_next > 0)
1879 udp_header_t * udp0;
1880 ip4_fib_mtrie_t * mtrie0;
1881 ip4_fib_mtrie_leaf_t leaf0;
1882 ip_adjacency_t * adj0;
1883 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, adj_index0;
1885 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1887 pi0 = to_next[0] = from[0];
1891 n_left_to_next -= 1;
1893 p0 = vlib_get_buffer (vm, pi0);
1895 ip0 = vlib_buffer_get_current (p0);
1897 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
1898 vnet_buffer(p0)->sw_if_index[VLIB_RX]);
1900 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
1902 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
1904 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1906 proto0 = ip0->protocol;
1907 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1908 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1912 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1914 udp0 = ip4_next_header (ip0);
1916 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1917 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1919 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1921 /* Verify UDP length. */
1922 ip_len0 = clib_net_to_host_u16 (ip0->length);
1923 udp_len0 = clib_net_to_host_u16 (udp0->length);
1925 len_diff0 = ip_len0 - udp_len0;
1927 len_diff0 = is_udp0 ? len_diff0 : 0;
1929 if (PREDICT_FALSE (! (is_tcp_udp0 & good_tcp_udp0)))
1934 && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1935 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1937 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1938 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1942 good_tcp_udp0 &= len_diff0 >= 0;
1944 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1946 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1948 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1950 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1951 error0 = (is_tcp_udp0 && ! good_tcp_udp0
1952 ? IP4_ERROR_TCP_CHECKSUM + is_udp0
1955 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1957 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1958 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
1960 ASSERT (adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
1962 /* no_default_route */ 1));
1964 adj0 = ip_get_adjacency (lm, adj_index0);
1966 /* Must have a route to source otherwise we drop the packet. */
1967 error0 = (error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1968 && adj0->lookup_next_index != IP_LOOKUP_NEXT_REWRITE
1969 && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP
1970 && adj0->lookup_next_index != IP_LOOKUP_NEXT_LOCAL
1971 && ip0->dst_address.as_u32 != 0xFFFFFFFF
1972 ? IP4_ERROR_SRC_LOOKUP_MISS
1975 next0 = lm->local_next_by_ip_protocol[proto0];
1977 next0 = error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1979 p0->error = error0? error_node->errors[error0] : 0;
1981 if (PREDICT_FALSE (next0 != next_index))
1983 n_left_to_next += 1;
1984 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1987 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1990 n_left_to_next -= 1;
1994 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1997 return frame->n_vectors;
2000 VLIB_REGISTER_NODE (ip4_local_node,static) = {
2001 .function = ip4_local,
2002 .name = "ip4-local",
2003 .vector_size = sizeof (u32),
2005 .format_trace = format_ip4_forward_next_trace,
2007 .n_next_nodes = IP_LOCAL_N_NEXT,
2009 [IP_LOCAL_NEXT_DROP] = "error-drop",
2010 [IP_LOCAL_NEXT_PUNT] = "error-punt",
2011 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
2012 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
2016 void ip4_register_protocol (u32 protocol, u32 node_index)
2018 vlib_main_t * vm = vlib_get_main();
2019 ip4_main_t * im = &ip4_main;
2020 ip_lookup_main_t * lm = &im->lookup_main;
2022 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
2023 lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip4_local_node.index, node_index);
2026 static clib_error_t *
2027 show_ip_local_command_fn (vlib_main_t * vm,
2028 unformat_input_t * input,
2029 vlib_cli_command_t * cmd)
2031 ip4_main_t * im = &ip4_main;
2032 ip_lookup_main_t * lm = &im->lookup_main;
2035 vlib_cli_output (vm, "Protocols handled by ip4_local");
2036 for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
2038 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2039 vlib_cli_output (vm, "%d", i);
2046 VLIB_CLI_COMMAND (show_ip_local, static) = {
2047 .path = "show ip local",
2048 .function = show_ip_local_command_fn,
2049 .short_help = "Show ip local protocol table",
2053 ip4_arp (vlib_main_t * vm,
2054 vlib_node_runtime_t * node,
2055 vlib_frame_t * frame)
2057 vnet_main_t * vnm = vnet_get_main();
2058 ip4_main_t * im = &ip4_main;
2059 ip_lookup_main_t * lm = &im->lookup_main;
2060 u32 * from, * to_next_drop;
2061 uword n_left_from, n_left_to_next_drop, next_index;
2062 static f64 time_last_seed_change = -1e100;
2063 static u32 hash_seeds[3];
2064 static uword hash_bitmap[256 / BITS (uword)];
2067 if (node->flags & VLIB_NODE_FLAG_TRACE)
2068 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2070 time_now = vlib_time_now (vm);
2071 if (time_now - time_last_seed_change > 1e-3)
2074 u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
2075 sizeof (hash_seeds));
2076 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2077 hash_seeds[i] = r[i];
2079 /* Mark all hash keys as been no-seen before. */
2080 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2083 time_last_seed_change = time_now;
2086 from = vlib_frame_vector_args (frame);
2087 n_left_from = frame->n_vectors;
2088 next_index = node->cached_next_index;
2089 if (next_index == IP4_ARP_NEXT_DROP)
2090 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2092 while (n_left_from > 0)
2094 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2095 to_next_drop, n_left_to_next_drop);
2097 while (n_left_from > 0 && n_left_to_next_drop > 0)
2101 ethernet_header_t * eh0;
2102 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2104 ip_adjacency_t * adj0;
2108 p0 = vlib_get_buffer (vm, pi0);
2110 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2111 adj0 = ip_get_adjacency (lm, adj_index0);
2112 ip0 = vlib_buffer_get_current (p0);
2114 /* If packet destination is not local, send ARP to next hop */
2115 if (adj0->arp.next_hop.ip4.as_u32)
2116 ip0->dst_address.data_u32 = adj0->arp.next_hop.ip4.as_u32;
2119 * if ip4_rewrite_local applied the IP_LOOKUP_NEXT_ARP
2120 * rewrite to this packet, we need to skip it here.
2121 * Note, to distinguish from src IP addr *.8.6.*, we
2122 * check for a bcast eth dest instead of IPv4 version.
2124 eh0 = (ethernet_header_t*)ip0;
2125 if ((ip0->ip_version_and_header_length & 0xF0) != 0x40)
2128 u16 * etype = &eh0->type;
2129 while ((*etype == clib_host_to_net_u16 (0x8100)) //dot1q
2130 || (*etype == clib_host_to_net_u16 (0x88a8)))//dot1ad
2133 etype += 2; //vlan tag also 16 bits, same as etype
2135 if (*etype == clib_host_to_net_u16 (0x0806)) //arp
2137 vlib_buffer_advance (
2138 p0, sizeof(ethernet_header_t) + (4*vlan_num));
2139 ip0 = vlib_buffer_get_current (p0);
2147 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2148 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2150 a0 ^= ip0->dst_address.data_u32;
2153 hash_v3_finalize32 (a0, b0, c0);
2155 c0 &= BITS (hash_bitmap) - 1;
2156 c0 = c0 / BITS (uword);
2157 m0 = (uword) 1 << (c0 % BITS (uword));
2159 bm0 = hash_bitmap[c0];
2160 drop0 = (bm0 & m0) != 0;
2162 /* Mark it as seen. */
2163 hash_bitmap[c0] = bm0 | m0;
2167 to_next_drop[0] = pi0;
2169 n_left_to_next_drop -= 1;
2171 p0->error = node->errors[drop0 ? IP4_ARP_ERROR_DROP : IP4_ARP_ERROR_REQUEST_SENT];
2177 * Can happen if the control-plane is programming tables
2178 * with traffic flowing; at least that's today's lame excuse.
2180 if (adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP)
2182 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2185 /* Send ARP request. */
2189 ethernet_arp_header_t * h0;
2190 vnet_hw_interface_t * hw_if0;
2192 h0 = vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template, &bi0);
2194 /* Add rewrite/encap string for ARP packet. */
2195 vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
2197 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2199 /* Src ethernet address in ARP header. */
2200 clib_memcpy (h0->ip4_over_ethernet[0].ethernet, hw_if0->hw_address,
2201 sizeof (h0->ip4_over_ethernet[0].ethernet));
2203 ip4_src_address_for_packet (im, p0, &h0->ip4_over_ethernet[0].ip4, sw_if_index0);
2205 /* Copy in destination address we are requesting. */
2206 h0->ip4_over_ethernet[1].ip4.data_u32 = ip0->dst_address.data_u32;
2208 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2209 b0 = vlib_get_buffer (vm, bi0);
2210 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2212 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2214 vlib_set_next_frame_buffer (vm, node, adj0->rewrite_header.next_index, bi0);
2218 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2221 return frame->n_vectors;
2224 static char * ip4_arp_error_strings[] = {
2225 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2226 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2227 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2228 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2229 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2232 VLIB_REGISTER_NODE (ip4_arp_node) = {
2233 .function = ip4_arp,
2235 .vector_size = sizeof (u32),
2237 .format_trace = format_ip4_forward_next_trace,
2239 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
2240 .error_strings = ip4_arp_error_strings,
2242 .n_next_nodes = IP4_ARP_N_NEXT,
2244 [IP4_ARP_NEXT_DROP] = "error-drop",
2248 #define foreach_notrace_ip4_arp_error \
2254 clib_error_t * arp_notrace_init (vlib_main_t * vm)
2256 vlib_node_runtime_t *rt =
2257 vlib_node_get_runtime (vm, ip4_arp_node.index);
2259 /* don't trace ARP request packets */
2261 vnet_pcap_drop_trace_filter_add_del \
2262 (rt->errors[IP4_ARP_ERROR_##a], \
2264 foreach_notrace_ip4_arp_error;
2269 VLIB_INIT_FUNCTION(arp_notrace_init);
2272 /* Send an ARP request to see if given destination is reachable on given interface. */
2274 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2276 vnet_main_t * vnm = vnet_get_main();
2277 ip4_main_t * im = &ip4_main;
2278 ethernet_arp_header_t * h;
2279 ip4_address_t * src;
2280 ip_interface_address_t * ia;
2281 ip_adjacency_t * adj;
2282 vnet_hw_interface_t * hi;
2283 vnet_sw_interface_t * si;
2287 si = vnet_get_sw_interface (vnm, sw_if_index);
2289 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2291 return clib_error_return (0, "%U: interface %U down",
2292 format_ip4_address, dst,
2293 format_vnet_sw_if_index_name, vnm,
2297 src = ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2300 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2301 return clib_error_return
2302 (0, "no matching interface address for destination %U (interface %U)",
2303 format_ip4_address, dst,
2304 format_vnet_sw_if_index_name, vnm, sw_if_index);
2307 adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2309 h = vlib_packet_template_get_packet (vm, &im->ip4_arp_request_packet_template, &bi);
2311 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2313 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address, sizeof (h->ip4_over_ethernet[0].ethernet));
2315 h->ip4_over_ethernet[0].ip4 = src[0];
2316 h->ip4_over_ethernet[1].ip4 = dst[0];
2318 b = vlib_get_buffer (vm, bi);
2319 vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2321 /* Add encapsulation string for software interface (e.g. ethernet header). */
2322 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2323 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2326 vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
2327 u32 * to_next = vlib_frame_vector_args (f);
2330 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2333 return /* no error */ 0;
2337 IP4_REWRITE_NEXT_DROP,
2338 IP4_REWRITE_NEXT_ARP,
2339 } ip4_rewrite_next_t;
2342 ip4_rewrite_inline (vlib_main_t * vm,
2343 vlib_node_runtime_t * node,
2344 vlib_frame_t * frame,
2345 int rewrite_for_locally_received_packets)
2347 ip_lookup_main_t * lm = &ip4_main.lookup_main;
2348 u32 * from = vlib_frame_vector_args (frame);
2349 u32 n_left_from, n_left_to_next, * to_next, next_index;
2350 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
2351 vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
2353 n_left_from = frame->n_vectors;
2354 next_index = node->cached_next_index;
2355 u32 cpu_index = os_get_cpu_number();
2357 while (n_left_from > 0)
2359 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2361 while (n_left_from >= 4 && n_left_to_next >= 2)
2363 ip_adjacency_t * adj0, * adj1;
2364 vlib_buffer_t * p0, * p1;
2365 ip4_header_t * ip0, * ip1;
2366 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2367 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2368 u32 next0_override, next1_override;
2370 if (rewrite_for_locally_received_packets)
2371 next0_override = next1_override = 0;
2373 /* Prefetch next iteration. */
2375 vlib_buffer_t * p2, * p3;
2377 p2 = vlib_get_buffer (vm, from[2]);
2378 p3 = vlib_get_buffer (vm, from[3]);
2380 vlib_prefetch_buffer_header (p2, STORE);
2381 vlib_prefetch_buffer_header (p3, STORE);
2383 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2384 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2387 pi0 = to_next[0] = from[0];
2388 pi1 = to_next[1] = from[1];
2393 n_left_to_next -= 2;
2395 p0 = vlib_get_buffer (vm, pi0);
2396 p1 = vlib_get_buffer (vm, pi1);
2398 adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2399 adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
2401 /* We should never rewrite a pkt using the MISS adjacency */
2402 ASSERT(adj_index0 && adj_index1);
2404 ip0 = vlib_buffer_get_current (p0);
2405 ip1 = vlib_buffer_get_current (p1);
2407 error0 = error1 = IP4_ERROR_NONE;
2409 /* Decrement TTL & update checksum.
2410 Works either endian, so no need for byte swap. */
2411 if (! rewrite_for_locally_received_packets)
2413 i32 ttl0 = ip0->ttl, ttl1 = ip1->ttl;
2415 /* Input node should have reject packets with ttl 0. */
2416 ASSERT (ip0->ttl > 0);
2417 ASSERT (ip1->ttl > 0);
2419 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2420 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2422 checksum0 += checksum0 >= 0xffff;
2423 checksum1 += checksum1 >= 0xffff;
2425 ip0->checksum = checksum0;
2426 ip1->checksum = checksum1;
2434 error0 = ttl0 <= 0 ? IP4_ERROR_TIME_EXPIRED : error0;
2435 error1 = ttl1 <= 0 ? IP4_ERROR_TIME_EXPIRED : error1;
2437 /* Verify checksum. */
2438 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2439 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2442 /* Rewrite packet header and updates lengths. */
2443 adj0 = ip_get_adjacency (lm, adj_index0);
2444 adj1 = ip_get_adjacency (lm, adj_index1);
2446 if (rewrite_for_locally_received_packets)
2449 * If someone sends e.g. an icmp4 w/ src = dst = interface addr,
2450 * we end up here with a local adjacency in hand
2451 * The local adj rewrite data is 0xfefe on purpose.
2452 * Bad engineer, no donut for you.
2454 if (PREDICT_FALSE(adj0->lookup_next_index
2455 == IP_LOOKUP_NEXT_LOCAL))
2456 error0 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2457 if (PREDICT_FALSE(adj0->lookup_next_index
2458 == IP_LOOKUP_NEXT_ARP))
2459 next0_override = IP4_REWRITE_NEXT_ARP;
2460 if (PREDICT_FALSE(adj1->lookup_next_index
2461 == IP_LOOKUP_NEXT_LOCAL))
2462 error1 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2463 if (PREDICT_FALSE(adj1->lookup_next_index
2464 == IP_LOOKUP_NEXT_ARP))
2465 next1_override = IP4_REWRITE_NEXT_ARP;
2468 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2469 rw_len0 = adj0[0].rewrite_header.data_bytes;
2470 rw_len1 = adj1[0].rewrite_header.data_bytes;
2471 next0 = (error0 == IP4_ERROR_NONE)
2472 ? adj0[0].rewrite_header.next_index : 0;
2474 if (rewrite_for_locally_received_packets)
2475 next0 = next0 && next0_override ? next0_override : next0;
2477 next1 = (error1 == IP4_ERROR_NONE)
2478 ? adj1[0].rewrite_header.next_index : 0;
2480 if (rewrite_for_locally_received_packets)
2481 next1 = next1 && next1_override ? next1_override : next1;
2484 * We've already accounted for an ethernet_header_t elsewhere
2486 if (PREDICT_FALSE (rw_len0 > sizeof(ethernet_header_t)))
2487 vlib_increment_combined_counter
2488 (&lm->adjacency_counters,
2489 cpu_index, adj_index0,
2490 /* packet increment */ 0,
2491 /* byte increment */ rw_len0-sizeof(ethernet_header_t));
2493 if (PREDICT_FALSE (rw_len1 > sizeof(ethernet_header_t)))
2494 vlib_increment_combined_counter
2495 (&lm->adjacency_counters,
2496 cpu_index, adj_index1,
2497 /* packet increment */ 0,
2498 /* byte increment */ rw_len1-sizeof(ethernet_header_t));
2500 /* Check MTU of outgoing interface. */
2501 error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2502 ? IP4_ERROR_MTU_EXCEEDED
2504 error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
2505 ? IP4_ERROR_MTU_EXCEEDED
2508 p0->current_data -= rw_len0;
2509 p1->current_data -= rw_len1;
2511 p0->current_length += rw_len0;
2512 p1->current_length += rw_len1;
2514 vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2515 vnet_buffer (p1)->sw_if_index[VLIB_TX] = adj1[0].rewrite_header.sw_if_index;
2517 p0->error = error_node->errors[error0];
2518 p1->error = error_node->errors[error1];
2520 /* Guess we are only writing on simple Ethernet header. */
2521 vnet_rewrite_two_headers (adj0[0], adj1[0],
2523 sizeof (ethernet_header_t));
2525 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2526 to_next, n_left_to_next,
2527 pi0, pi1, next0, next1);
2530 while (n_left_from > 0 && n_left_to_next > 0)
2532 ip_adjacency_t * adj0;
2535 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2538 if (rewrite_for_locally_received_packets)
2541 pi0 = to_next[0] = from[0];
2543 p0 = vlib_get_buffer (vm, pi0);
2545 adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2547 /* We should never rewrite a pkt using the MISS adjacency */
2550 adj0 = ip_get_adjacency (lm, adj_index0);
2552 ip0 = vlib_buffer_get_current (p0);
2554 error0 = IP4_ERROR_NONE;
2555 next0 = 0; /* drop on error */
2557 /* Decrement TTL & update checksum. */
2558 if (! rewrite_for_locally_received_packets)
2560 i32 ttl0 = ip0->ttl;
2562 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2564 checksum0 += checksum0 >= 0xffff;
2566 ip0->checksum = checksum0;
2568 ASSERT (ip0->ttl > 0);
2574 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2576 error0 = ttl0 <= 0 ? IP4_ERROR_TIME_EXPIRED : error0;
2579 if (rewrite_for_locally_received_packets)
2582 * If someone sends e.g. an icmp4 w/ src = dst = interface addr,
2583 * we end up here with a local adjacency in hand
2584 * The local adj rewrite data is 0xfefe on purpose.
2585 * Bad engineer, no donut for you.
2587 if (PREDICT_FALSE(adj0->lookup_next_index
2588 == IP_LOOKUP_NEXT_LOCAL))
2589 error0 = IP4_ERROR_SPOOFED_LOCAL_PACKETS;
2591 * We have to override the next_index in ARP adjacencies,
2592 * because they're set up for ip4-arp, not this node...
2594 if (PREDICT_FALSE(adj0->lookup_next_index
2595 == IP_LOOKUP_NEXT_ARP))
2596 next0_override = IP4_REWRITE_NEXT_ARP;
2599 /* Guess we are only writing on simple Ethernet header. */
2600 vnet_rewrite_one_header (adj0[0], ip0,
2601 sizeof (ethernet_header_t));
2603 /* Update packet buffer attributes/set output interface. */
2604 rw_len0 = adj0[0].rewrite_header.data_bytes;
2606 if (PREDICT_FALSE (rw_len0 > sizeof(ethernet_header_t)))
2607 vlib_increment_combined_counter
2608 (&lm->adjacency_counters,
2609 cpu_index, adj_index0,
2610 /* packet increment */ 0,
2611 /* byte increment */ rw_len0-sizeof(ethernet_header_t));
2613 /* Check MTU of outgoing interface. */
2614 error0 = (vlib_buffer_length_in_chain (vm, p0)
2615 > adj0[0].rewrite_header.max_l3_packet_bytes
2616 ? IP4_ERROR_MTU_EXCEEDED
2619 p0->error = error_node->errors[error0];
2620 p0->current_data -= rw_len0;
2621 p0->current_length += rw_len0;
2622 vnet_buffer (p0)->sw_if_index[VLIB_TX] =
2623 adj0[0].rewrite_header.sw_if_index;
2625 next0 = (error0 == IP4_ERROR_NONE)
2626 ? adj0[0].rewrite_header.next_index : 0;
2628 if (rewrite_for_locally_received_packets)
2629 next0 = next0 && next0_override ? next0_override : next0;
2634 n_left_to_next -= 1;
2636 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2637 to_next, n_left_to_next,
2641 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2644 /* Need to do trace after rewrites to pick up new packet data. */
2645 if (node->flags & VLIB_NODE_FLAG_TRACE)
2646 ip4_forward_next_trace (vm, node, frame, adj_rx_tx);
2648 return frame->n_vectors;
2652 ip4_rewrite_transit (vlib_main_t * vm,
2653 vlib_node_runtime_t * node,
2654 vlib_frame_t * frame)
2656 return ip4_rewrite_inline (vm, node, frame,
2657 /* rewrite_for_locally_received_packets */ 0);
2661 ip4_rewrite_local (vlib_main_t * vm,
2662 vlib_node_runtime_t * node,
2663 vlib_frame_t * frame)
2665 return ip4_rewrite_inline (vm, node, frame,
2666 /* rewrite_for_locally_received_packets */ 1);
2669 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2670 .function = ip4_rewrite_transit,
2671 .name = "ip4-rewrite-transit",
2672 .vector_size = sizeof (u32),
2674 .format_trace = format_ip4_forward_next_trace,
2678 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2679 [IP4_REWRITE_NEXT_ARP] = "ip4-arp",
2683 VLIB_REGISTER_NODE (ip4_rewrite_local_node,static) = {
2684 .function = ip4_rewrite_local,
2685 .name = "ip4-rewrite-local",
2686 .vector_size = sizeof (u32),
2688 .sibling_of = "ip4-rewrite-transit",
2690 .format_trace = format_ip4_forward_next_trace,
2694 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2695 [IP4_REWRITE_NEXT_ARP] = "ip4-arp",
2699 static clib_error_t *
2700 add_del_interface_table (vlib_main_t * vm,
2701 unformat_input_t * input,
2702 vlib_cli_command_t * cmd)
2704 vnet_main_t * vnm = vnet_get_main();
2705 clib_error_t * error = 0;
2706 u32 sw_if_index, table_id;
2710 if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2712 error = clib_error_return (0, "unknown interface `%U'",
2713 format_unformat_error, input);
2717 if (unformat (input, "%d", &table_id))
2721 error = clib_error_return (0, "expected table id `%U'",
2722 format_unformat_error, input);
2727 ip4_main_t * im = &ip4_main;
2728 ip4_fib_t * fib = find_ip4_fib_by_table_index_or_id (im, table_id, IP4_ROUTE_FLAG_TABLE_ID);
2732 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2733 im->fib_index_by_sw_if_index[sw_if_index] = fib->index;
2741 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) = {
2742 .path = "set interface ip table",
2743 .function = add_del_interface_table,
2744 .short_help = "Add/delete FIB table id for interface",
2749 ip4_lookup_multicast (vlib_main_t * vm,
2750 vlib_node_runtime_t * node,
2751 vlib_frame_t * frame)
2753 ip4_main_t * im = &ip4_main;
2754 ip_lookup_main_t * lm = &im->lookup_main;
2755 vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
2756 u32 n_left_from, n_left_to_next, * from, * to_next;
2757 ip_lookup_next_t next;
2758 u32 cpu_index = os_get_cpu_number();
2760 from = vlib_frame_vector_args (frame);
2761 n_left_from = frame->n_vectors;
2762 next = node->cached_next_index;
2764 while (n_left_from > 0)
2766 vlib_get_next_frame (vm, node, next,
2767 to_next, n_left_to_next);
2769 while (n_left_from >= 4 && n_left_to_next >= 2)
2771 vlib_buffer_t * p0, * p1;
2772 u32 pi0, pi1, adj_index0, adj_index1, wrong_next;
2773 ip_lookup_next_t next0, next1;
2774 ip4_header_t * ip0, * ip1;
2775 ip_adjacency_t * adj0, * adj1;
2776 u32 fib_index0, fib_index1;
2777 u32 flow_hash_config0, flow_hash_config1;
2779 /* Prefetch next iteration. */
2781 vlib_buffer_t * p2, * p3;
2783 p2 = vlib_get_buffer (vm, from[2]);
2784 p3 = vlib_get_buffer (vm, from[3]);
2786 vlib_prefetch_buffer_header (p2, LOAD);
2787 vlib_prefetch_buffer_header (p3, LOAD);
2789 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
2790 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
2793 pi0 = to_next[0] = from[0];
2794 pi1 = to_next[1] = from[1];
2796 p0 = vlib_get_buffer (vm, pi0);
2797 p1 = vlib_get_buffer (vm, pi1);
2799 ip0 = vlib_buffer_get_current (p0);
2800 ip1 = vlib_buffer_get_current (p1);
2802 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
2803 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
2804 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
2805 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
2806 fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
2807 fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
2809 adj_index0 = ip4_fib_lookup_buffer (im, fib_index0,
2810 &ip0->dst_address, p0);
2811 adj_index1 = ip4_fib_lookup_buffer (im, fib_index1,
2812 &ip1->dst_address, p1);
2814 adj0 = ip_get_adjacency (lm, adj_index0);
2815 adj1 = ip_get_adjacency (lm, adj_index1);
2817 next0 = adj0->lookup_next_index;
2818 next1 = adj1->lookup_next_index;
2821 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
2824 vec_elt_at_index (im->fibs, fib_index1)->flow_hash_config;
2826 vnet_buffer (p0)->ip.flow_hash = ip4_compute_flow_hash
2827 (ip0, flow_hash_config0);
2829 vnet_buffer (p1)->ip.flow_hash = ip4_compute_flow_hash
2830 (ip1, flow_hash_config1);
2832 ASSERT (adj0->n_adj > 0);
2833 ASSERT (adj1->n_adj > 0);
2834 ASSERT (is_pow2 (adj0->n_adj));
2835 ASSERT (is_pow2 (adj1->n_adj));
2836 adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
2837 adj_index1 += (vnet_buffer (p1)->ip.flow_hash & (adj1->n_adj - 1));
2839 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
2840 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
2842 if (1) /* $$$$$$ HACK FIXME */
2843 vlib_increment_combined_counter
2844 (cm, cpu_index, adj_index0, 1,
2845 vlib_buffer_length_in_chain (vm, p0));
2846 if (1) /* $$$$$$ HACK FIXME */
2847 vlib_increment_combined_counter
2848 (cm, cpu_index, adj_index1, 1,
2849 vlib_buffer_length_in_chain (vm, p1));
2853 n_left_to_next -= 2;
2856 wrong_next = (next0 != next) + 2*(next1 != next);
2857 if (PREDICT_FALSE (wrong_next != 0))
2865 n_left_to_next += 1;
2866 vlib_set_next_frame_buffer (vm, node, next0, pi0);
2872 n_left_to_next += 1;
2873 vlib_set_next_frame_buffer (vm, node, next1, pi1);
2879 n_left_to_next += 2;
2880 vlib_set_next_frame_buffer (vm, node, next0, pi0);
2881 vlib_set_next_frame_buffer (vm, node, next1, pi1);
2885 vlib_put_next_frame (vm, node, next, n_left_to_next);
2887 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
2893 while (n_left_from > 0 && n_left_to_next > 0)
2897 u32 pi0, adj_index0;
2898 ip_lookup_next_t next0;
2899 ip_adjacency_t * adj0;
2901 u32 flow_hash_config0;
2906 p0 = vlib_get_buffer (vm, pi0);
2908 ip0 = vlib_buffer_get_current (p0);
2910 fib_index0 = vec_elt (im->fib_index_by_sw_if_index,
2911 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
2912 fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
2913 fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
2915 adj_index0 = ip4_fib_lookup_buffer (im, fib_index0,
2916 &ip0->dst_address, p0);
2918 adj0 = ip_get_adjacency (lm, adj_index0);
2920 next0 = adj0->lookup_next_index;
2923 vec_elt_at_index (im->fibs, fib_index0)->flow_hash_config;
2925 vnet_buffer (p0)->ip.flow_hash =
2926 ip4_compute_flow_hash (ip0, flow_hash_config0);
2928 ASSERT (adj0->n_adj > 0);
2929 ASSERT (is_pow2 (adj0->n_adj));
2930 adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
2932 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
2934 if (1) /* $$$$$$ HACK FIXME */
2935 vlib_increment_combined_counter
2936 (cm, cpu_index, adj_index0, 1,
2937 vlib_buffer_length_in_chain (vm, p0));
2941 n_left_to_next -= 1;
2944 if (PREDICT_FALSE (next0 != next))
2946 n_left_to_next += 1;
2947 vlib_put_next_frame (vm, node, next, n_left_to_next);
2949 vlib_get_next_frame (vm, node, next,
2950 to_next, n_left_to_next);
2953 n_left_to_next -= 1;
2957 vlib_put_next_frame (vm, node, next, n_left_to_next);
2960 return frame->n_vectors;
2963 VLIB_REGISTER_NODE (ip4_lookup_multicast_node,static) = {
2964 .function = ip4_lookup_multicast,
2965 .name = "ip4-lookup-multicast",
2966 .vector_size = sizeof (u32),
2968 .n_next_nodes = IP_LOOKUP_N_NEXT,
2969 .next_nodes = IP4_LOOKUP_NEXT_NODES,
2972 VLIB_REGISTER_NODE (ip4_multicast_node,static) = {
2973 .function = ip4_drop,
2974 .name = "ip4-multicast",
2975 .vector_size = sizeof (u32),
2977 .format_trace = format_ip4_forward_next_trace,
2985 int ip4_lookup_validate (ip4_address_t *a, u32 fib_index0)
2987 ip4_main_t * im = &ip4_main;
2988 ip4_fib_mtrie_t * mtrie0;
2989 ip4_fib_mtrie_leaf_t leaf0;
2992 mtrie0 = &vec_elt_at_index (im->fibs, fib_index0)->mtrie;
2994 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
2995 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 0);
2996 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 1);
2997 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2998 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
3000 /* Handle default route. */
3001 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
3003 adj_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
3005 return adj_index0 == ip4_fib_lookup_with_table (im, fib_index0,
3007 /* no_default_route */ 0);
3010 static clib_error_t *
3011 test_lookup_command_fn (vlib_main_t * vm,
3012 unformat_input_t * input,
3013 vlib_cli_command_t * cmd)
3019 ip4_address_t ip4_base_address;
3022 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3023 if (unformat (input, "table %d", &table_id))
3025 else if (unformat (input, "count %f", &count))
3028 else if (unformat (input, "%U",
3029 unformat_ip4_address, &ip4_base_address))
3032 return clib_error_return (0, "unknown input `%U'",
3033 format_unformat_error, input);
3038 for (i = 0; i < n; i++)
3040 if (!ip4_lookup_validate (&ip4_base_address, table_id))
3043 ip4_base_address.as_u32 =
3044 clib_host_to_net_u32 (1 +
3045 clib_net_to_host_u32 (ip4_base_address.as_u32));
3049 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
3051 vlib_cli_output (vm, "No errors in %d lookups\n", n);
3056 VLIB_CLI_COMMAND (lookup_test_command, static) = {
3057 .path = "test lookup",
3058 .short_help = "test lookup",
3059 .function = test_lookup_command_fn,
3062 int vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
3064 ip4_main_t * im4 = &ip4_main;
3066 uword * p = hash_get (im4->fib_index_by_table_id, table_id);
3069 return VNET_API_ERROR_NO_SUCH_FIB;
3071 fib = vec_elt_at_index (im4->fibs, p[0]);
3073 fib->flow_hash_config = flow_hash_config;
3077 static clib_error_t *
3078 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3079 unformat_input_t * input,
3080 vlib_cli_command_t * cmd)
3084 u32 flow_hash_config = 0;
3087 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3088 if (unformat (input, "table %d", &table_id))
3091 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3092 foreach_flow_hash_bit
3098 return clib_error_return (0, "unknown input `%U'",
3099 format_unformat_error, input);
3101 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3107 case VNET_API_ERROR_NO_SUCH_FIB:
3108 return clib_error_return (0, "no such FIB table %d", table_id);
3111 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3118 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) = {
3119 .path = "set ip flow-hash",
3121 "set ip table flow-hash table <fib-id> src dst sport dport proto reverse",
3122 .function = set_ip_flow_hash_command_fn,
3125 int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3128 vnet_main_t * vnm = vnet_get_main();
3129 vnet_interface_main_t * im = &vnm->interface_main;
3130 ip4_main_t * ipm = &ip4_main;
3131 ip_lookup_main_t * lm = &ipm->lookup_main;
3132 vnet_classify_main_t * cm = &vnet_classify_main;
3134 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3135 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3137 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3138 return VNET_API_ERROR_NO_SUCH_ENTRY;
3140 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3141 lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
3146 static clib_error_t *
3147 set_ip_classify_command_fn (vlib_main_t * vm,
3148 unformat_input_t * input,
3149 vlib_cli_command_t * cmd)
3151 u32 table_index = ~0;
3152 int table_index_set = 0;
3153 u32 sw_if_index = ~0;
3156 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3157 if (unformat (input, "table-index %d", &table_index))
3158 table_index_set = 1;
3159 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3160 vnet_get_main(), &sw_if_index))
3166 if (table_index_set == 0)
3167 return clib_error_return (0, "classify table-index must be specified");
3169 if (sw_if_index == ~0)
3170 return clib_error_return (0, "interface / subif must be specified");
3172 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3179 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3180 return clib_error_return (0, "No such interface");
3182 case VNET_API_ERROR_NO_SUCH_ENTRY:
3183 return clib_error_return (0, "No such classifier table");
3188 VLIB_CLI_COMMAND (set_ip_classify_command, static) = {
3189 .path = "set ip classify",
3191 "set ip classify intfc <int> table-index <index>",
3192 .function = set_ip_classify_command_fn,