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/ip/ip_frag.h>
43 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
44 #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
45 #include <vnet/ppp/ppp.h>
46 #include <vnet/srp/srp.h> /* for srp_hw_interface_class */
47 #include <vnet/api_errno.h> /* for API error numbers */
48 #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
49 #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
50 #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */
51 #include <vnet/fib/ip4_fib.h>
52 #include <vnet/dpo/load_balance.h>
53 #include <vnet/dpo/load_balance_map.h>
54 #include <vnet/dpo/classify_dpo.h>
55 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
57 #include <vnet/ip/ip4_forward.h>
59 /** @brief IPv4 lookup node.
62 This is the main IPv4 lookup dispatch node.
64 @param vm vlib_main_t corresponding to the current thread
65 @param node vlib_node_runtime_t
66 @param frame vlib_frame_t whose contents should be dispatched
68 @par Graph mechanics: buffer metadata, next index usage
71 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
72 - Indicates the @c sw_if_index value of the interface that the
73 packet was received on.
74 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
75 - When the value is @c ~0 then the node performs a longest prefix
76 match (LPM) for the packet destination address in the FIB attached
77 to the receive interface.
78 - Otherwise perform LPM for the packet destination address in the
79 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
80 value (0, 1, ...) and not a VRF id.
83 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
84 - The lookup result adjacency index.
87 - Dispatches the packet to the node index found in
88 ip_adjacency_t @c adj->lookup_next_index
89 (where @c adj is the lookup result adjacency).
91 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
94 return ip4_lookup_inline (vm, node, frame,
95 /* lookup_for_responses_to_locally_received_packets */
100 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
103 VLIB_REGISTER_NODE (ip4_lookup_node) =
105 .name = "ip4-lookup",
106 .vector_size = sizeof (u32),
107 .format_trace = format_ip4_lookup_trace,
108 .n_next_nodes = IP_LOOKUP_N_NEXT,
109 .next_nodes = IP4_LOOKUP_NEXT_NODES,
113 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
114 vlib_node_runtime_t * node,
115 vlib_frame_t * frame)
117 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
118 u32 n_left_from, n_left_to_next, *from, *to_next;
119 ip_lookup_next_t next;
120 u32 thread_index = vm->thread_index;
122 from = vlib_frame_vector_args (frame);
123 n_left_from = frame->n_vectors;
124 next = node->cached_next_index;
126 if (node->flags & VLIB_NODE_FLAG_TRACE)
127 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
129 while (n_left_from > 0)
131 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
134 while (n_left_from >= 4 && n_left_to_next >= 2)
136 ip_lookup_next_t next0, next1;
137 const load_balance_t *lb0, *lb1;
138 vlib_buffer_t *p0, *p1;
139 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
140 const ip4_header_t *ip0, *ip1;
141 const dpo_id_t *dpo0, *dpo1;
143 /* Prefetch next iteration. */
145 vlib_buffer_t *p2, *p3;
147 p2 = vlib_get_buffer (vm, from[2]);
148 p3 = vlib_get_buffer (vm, from[3]);
150 vlib_prefetch_buffer_header (p2, STORE);
151 vlib_prefetch_buffer_header (p3, STORE);
153 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
154 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
157 pi0 = to_next[0] = from[0];
158 pi1 = to_next[1] = from[1];
165 p0 = vlib_get_buffer (vm, pi0);
166 p1 = vlib_get_buffer (vm, pi1);
168 ip0 = vlib_buffer_get_current (p0);
169 ip1 = vlib_buffer_get_current (p1);
170 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
171 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
173 lb0 = load_balance_get (lbi0);
174 lb1 = load_balance_get (lbi1);
177 * this node is for via FIBs we can re-use the hash value from the
178 * to node if present.
179 * We don't want to use the same hash value at each level in the recursion
180 * graph as that would lead to polarisation
184 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
186 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
188 hc0 = vnet_buffer (p0)->ip.flow_hash =
189 vnet_buffer (p0)->ip.flow_hash >> 1;
193 hc0 = vnet_buffer (p0)->ip.flow_hash =
194 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
196 dpo0 = load_balance_get_fwd_bucket
197 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
201 dpo0 = load_balance_get_bucket_i (lb0, 0);
203 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
205 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
207 hc1 = vnet_buffer (p1)->ip.flow_hash =
208 vnet_buffer (p1)->ip.flow_hash >> 1;
212 hc1 = vnet_buffer (p1)->ip.flow_hash =
213 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
215 dpo1 = load_balance_get_fwd_bucket
216 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
220 dpo1 = load_balance_get_bucket_i (lb1, 0);
223 next0 = dpo0->dpoi_next_node;
224 next1 = dpo1->dpoi_next_node;
226 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
227 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
229 vlib_increment_combined_counter
230 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
231 vlib_increment_combined_counter
232 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
234 vlib_validate_buffer_enqueue_x2 (vm, node, next,
235 to_next, n_left_to_next,
236 pi0, pi1, next0, next1);
239 while (n_left_from > 0 && n_left_to_next > 0)
241 ip_lookup_next_t next0;
242 const load_balance_t *lb0;
245 const ip4_header_t *ip0;
246 const dpo_id_t *dpo0;
255 p0 = vlib_get_buffer (vm, pi0);
257 ip0 = vlib_buffer_get_current (p0);
258 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
260 lb0 = load_balance_get (lbi0);
263 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
265 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
267 hc0 = vnet_buffer (p0)->ip.flow_hash =
268 vnet_buffer (p0)->ip.flow_hash >> 1;
272 hc0 = vnet_buffer (p0)->ip.flow_hash =
273 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
275 dpo0 = load_balance_get_fwd_bucket
276 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
280 dpo0 = load_balance_get_bucket_i (lb0, 0);
283 next0 = dpo0->dpoi_next_node;
284 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
286 vlib_increment_combined_counter
287 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
289 vlib_validate_buffer_enqueue_x1 (vm, node, next,
290 to_next, n_left_to_next,
294 vlib_put_next_frame (vm, node, next, n_left_to_next);
297 return frame->n_vectors;
301 VLIB_REGISTER_NODE (ip4_load_balance_node) =
303 .name = "ip4-load-balance",
304 .vector_size = sizeof (u32),
305 .sibling_of = "ip4-lookup",
306 .format_trace = format_ip4_lookup_trace,
310 #ifndef CLIB_MARCH_VARIANT
311 /* get first interface address */
313 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
314 ip_interface_address_t ** result_ia)
316 ip_lookup_main_t *lm = &im->lookup_main;
317 ip_interface_address_t *ia = 0;
318 ip4_address_t *result = 0;
321 foreach_ip_interface_address
322 (lm, ia, sw_if_index,
323 1 /* honor unnumbered */ ,
326 ip_interface_address_get_address (lm, ia);
332 *result_ia = result ? ia : 0;
337 ip4_add_subnet_bcast_route (u32 fib_index,
341 vnet_sw_interface_flags_t iflags;
343 iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
345 fib_table_entry_special_remove(fib_index,
347 FIB_SOURCE_INTERFACE);
349 if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
351 fib_table_entry_update_one_path (fib_index, pfx,
352 FIB_SOURCE_INTERFACE,
355 /* No next-hop address */
361 // no out-label stack
363 FIB_ROUTE_PATH_FLAG_NONE);
367 fib_table_entry_special_add(fib_index,
369 FIB_SOURCE_INTERFACE,
370 (FIB_ENTRY_FLAG_DROP |
371 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
376 ip4_add_interface_routes (u32 sw_if_index,
377 ip4_main_t * im, u32 fib_index,
378 ip_interface_address_t * a)
380 ip_lookup_main_t *lm = &im->lookup_main;
381 ip4_address_t *address = ip_interface_address_get_address (lm, a);
383 .fp_len = a->address_length,
384 .fp_proto = FIB_PROTOCOL_IP4,
385 .fp_addr.ip4 = *address,
388 if (pfx.fp_len <= 30)
390 /* a /30 or shorter - add a glean for the network address */
391 fib_table_entry_update_one_path (fib_index, &pfx,
392 FIB_SOURCE_INTERFACE,
393 (FIB_ENTRY_FLAG_CONNECTED |
394 FIB_ENTRY_FLAG_ATTACHED),
396 /* No next-hop address */
402 // no out-label stack
404 FIB_ROUTE_PATH_FLAG_NONE);
406 /* Add the two broadcast addresses as drop */
407 fib_prefix_t net_pfx = {
409 .fp_proto = FIB_PROTOCOL_IP4,
410 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
412 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
413 fib_table_entry_special_add(fib_index,
415 FIB_SOURCE_INTERFACE,
416 (FIB_ENTRY_FLAG_DROP |
417 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
418 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
419 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
420 ip4_add_subnet_bcast_route(fib_index, &net_pfx, sw_if_index);
422 else if (pfx.fp_len == 31)
424 u32 mask = clib_host_to_net_u32(1);
425 fib_prefix_t net_pfx = pfx;
428 net_pfx.fp_addr.ip4.as_u32 ^= mask;
430 /* a /31 - add the other end as an attached host */
431 fib_table_entry_update_one_path (fib_index, &net_pfx,
432 FIB_SOURCE_INTERFACE,
433 (FIB_ENTRY_FLAG_ATTACHED),
441 FIB_ROUTE_PATH_FLAG_NONE);
445 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
447 u32 classify_table_index =
448 lm->classify_table_index_by_sw_if_index[sw_if_index];
449 if (classify_table_index != (u32) ~ 0)
451 dpo_id_t dpo = DPO_INVALID;
456 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
458 fib_table_entry_special_dpo_add (fib_index,
461 FIB_ENTRY_FLAG_NONE, &dpo);
466 fib_table_entry_update_one_path (fib_index, &pfx,
467 FIB_SOURCE_INTERFACE,
468 (FIB_ENTRY_FLAG_CONNECTED |
469 FIB_ENTRY_FLAG_LOCAL),
476 FIB_ROUTE_PATH_FLAG_NONE);
480 ip4_del_interface_routes (ip4_main_t * im,
482 ip4_address_t * address, u32 address_length)
485 .fp_len = address_length,
486 .fp_proto = FIB_PROTOCOL_IP4,
487 .fp_addr.ip4 = *address,
490 if (pfx.fp_len <= 30)
492 fib_prefix_t net_pfx = {
494 .fp_proto = FIB_PROTOCOL_IP4,
495 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
497 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
498 fib_table_entry_special_remove(fib_index,
500 FIB_SOURCE_INTERFACE);
501 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
502 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
503 fib_table_entry_special_remove(fib_index,
505 FIB_SOURCE_INTERFACE);
506 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
508 else if (pfx.fp_len == 31)
510 u32 mask = clib_host_to_net_u32(1);
511 fib_prefix_t net_pfx = pfx;
514 net_pfx.fp_addr.ip4.as_u32 ^= mask;
516 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
520 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
524 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
526 ip4_main_t *im = &ip4_main;
528 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
531 * enable/disable only on the 1<->0 transition
535 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
540 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
541 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
544 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
548 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
549 sw_if_index, !is_enable, 0, 0);
552 static clib_error_t *
553 ip4_add_del_interface_address_internal (vlib_main_t * vm,
555 ip4_address_t * address,
556 u32 address_length, u32 is_del)
558 vnet_main_t *vnm = vnet_get_main ();
559 ip4_main_t *im = &ip4_main;
560 ip_lookup_main_t *lm = &im->lookup_main;
561 clib_error_t *error = 0;
562 u32 if_address_index, elts_before;
563 ip4_address_fib_t ip4_af, *addr_fib = 0;
565 /* local0 interface doesn't support IP addressing */
566 if (sw_if_index == 0)
569 clib_error_create ("local0 interface doesn't support IP addressing");
572 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
573 ip4_addr_fib_init (&ip4_af, address,
574 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
575 vec_add1 (addr_fib, ip4_af);
578 * there is no support for adj-fib handling in the presence of overlapping
579 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
585 /* When adding an address check that it does not conflict
586 with an existing address on any interface in this table. */
587 ip_interface_address_t *ia;
588 vnet_sw_interface_t *sif;
590 pool_foreach(sif, vnm->interface_main.sw_interfaces,
592 if (im->fib_index_by_sw_if_index[sw_if_index] ==
593 im->fib_index_by_sw_if_index[sif->sw_if_index])
595 foreach_ip_interface_address
596 (&im->lookup_main, ia, sif->sw_if_index,
597 0 /* honor unnumbered */ ,
600 ip_interface_address_get_address
601 (&im->lookup_main, ia);
602 if (ip4_destination_matches_route
603 (im, address, x, ia->address_length) ||
604 ip4_destination_matches_route (im,
609 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
613 ("failed to add %U which conflicts with %U for interface %U",
614 format_ip4_address_and_length, address,
616 format_ip4_address_and_length, x,
618 format_vnet_sw_if_index_name, vnm,
627 elts_before = pool_elts (lm->if_address_pool);
629 error = ip_interface_address_add_del
630 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
634 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
637 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
639 ip4_add_interface_routes (sw_if_index,
640 im, ip4_af.fib_index,
642 (lm->if_address_pool, if_address_index));
644 /* If pool did not grow/shrink: add duplicate address. */
645 if (elts_before != pool_elts (lm->if_address_pool))
647 ip4_add_del_interface_address_callback_t *cb;
648 vec_foreach (cb, im->add_del_interface_address_callbacks)
649 cb->function (im, cb->function_opaque, sw_if_index,
650 address, address_length, if_address_index, is_del);
659 ip4_add_del_interface_address (vlib_main_t * vm,
661 ip4_address_t * address,
662 u32 address_length, u32 is_del)
664 return ip4_add_del_interface_address_internal
665 (vm, sw_if_index, address, address_length, is_del);
669 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
671 ip_interface_address_t *ia;
677 * when directed broadcast is enabled, the subnet braodcast route will forward
678 * packets using an adjacency with a broadcast MAC. otherwise it drops
681 foreach_ip_interface_address(&im->lookup_main, ia,
684 if (ia->address_length <= 30)
688 ipa = ip_interface_address_get_address (&im->lookup_main, ia);
692 .fp_proto = FIB_PROTOCOL_IP4,
694 .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
698 ip4_add_subnet_bcast_route
699 (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
708 /* Built-in ip4 unicast rx feature path definition */
710 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
712 .arc_name = "ip4-unicast",
713 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
714 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
717 VNET_FEATURE_INIT (ip4_flow_classify, static) =
719 .arc_name = "ip4-unicast",
720 .node_name = "ip4-flow-classify",
721 .runs_before = VNET_FEATURES ("ip4-inacl"),
724 VNET_FEATURE_INIT (ip4_inacl, static) =
726 .arc_name = "ip4-unicast",
727 .node_name = "ip4-inacl",
728 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
731 VNET_FEATURE_INIT (ip4_source_check_1, static) =
733 .arc_name = "ip4-unicast",
734 .node_name = "ip4-source-check-via-rx",
735 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
738 VNET_FEATURE_INIT (ip4_source_check_2, static) =
740 .arc_name = "ip4-unicast",
741 .node_name = "ip4-source-check-via-any",
742 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
745 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
747 .arc_name = "ip4-unicast",
748 .node_name = "ip4-source-and-port-range-check-rx",
749 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
752 VNET_FEATURE_INIT (ip4_policer_classify, static) =
754 .arc_name = "ip4-unicast",
755 .node_name = "ip4-policer-classify",
756 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
759 VNET_FEATURE_INIT (ip4_ipsec, static) =
761 .arc_name = "ip4-unicast",
762 .node_name = "ipsec-input-ip4",
763 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
766 VNET_FEATURE_INIT (ip4_vpath, static) =
768 .arc_name = "ip4-unicast",
769 .node_name = "vpath-input-ip4",
770 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
773 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
775 .arc_name = "ip4-unicast",
776 .node_name = "ip4-vxlan-bypass",
777 .runs_before = VNET_FEATURES ("ip4-lookup"),
780 VNET_FEATURE_INIT (ip4_not_enabled, static) =
782 .arc_name = "ip4-unicast",
783 .node_name = "ip4-not-enabled",
784 .runs_before = VNET_FEATURES ("ip4-lookup"),
787 VNET_FEATURE_INIT (ip4_lookup, static) =
789 .arc_name = "ip4-unicast",
790 .node_name = "ip4-lookup",
791 .runs_before = 0, /* not before any other features */
794 /* Built-in ip4 multicast rx feature path definition */
795 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
797 .arc_name = "ip4-multicast",
798 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
799 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
802 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
804 .arc_name = "ip4-multicast",
805 .node_name = "vpath-input-ip4",
806 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
809 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
811 .arc_name = "ip4-multicast",
812 .node_name = "ip4-not-enabled",
813 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
816 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
818 .arc_name = "ip4-multicast",
819 .node_name = "ip4-mfib-forward-lookup",
820 .runs_before = 0, /* last feature */
823 /* Source and port-range check ip4 tx feature path definition */
824 VNET_FEATURE_ARC_INIT (ip4_output, static) =
826 .arc_name = "ip4-output",
827 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
828 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
831 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
833 .arc_name = "ip4-output",
834 .node_name = "ip4-source-and-port-range-check-tx",
835 .runs_before = VNET_FEATURES ("ip4-outacl"),
838 VNET_FEATURE_INIT (ip4_outacl, static) =
840 .arc_name = "ip4-output",
841 .node_name = "ip4-outacl",
842 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
845 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
847 .arc_name = "ip4-output",
848 .node_name = "ipsec-output-ip4",
849 .runs_before = VNET_FEATURES ("interface-output"),
852 /* Built-in ip4 tx feature path definition */
853 VNET_FEATURE_INIT (ip4_interface_output, static) =
855 .arc_name = "ip4-output",
856 .node_name = "interface-output",
857 .runs_before = 0, /* not before any other features */
861 static clib_error_t *
862 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
864 ip4_main_t *im = &ip4_main;
866 /* Fill in lookup tables with default table (0). */
867 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
868 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
872 ip4_main_t *im4 = &ip4_main;
873 ip_lookup_main_t *lm4 = &im4->lookup_main;
874 ip_interface_address_t *ia = 0;
875 ip4_address_t *address;
876 vlib_main_t *vm = vlib_get_main ();
878 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
880 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
882 address = ip_interface_address_get_address (lm4, ia);
883 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
888 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
891 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
892 sw_if_index, is_add, 0, 0);
894 return /* no error */ 0;
897 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
899 /* Global IP4 main. */
902 static clib_error_t *
903 ip4_lookup_init (vlib_main_t * vm)
905 ip4_main_t *im = &ip4_main;
909 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
911 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
913 if ((error = vlib_call_init_function (vm, fib_module_init)))
915 if ((error = vlib_call_init_function (vm, mfib_module_init)))
918 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
923 m = pow2_mask (i) << (32 - i);
926 im->fib_masks[i] = clib_host_to_net_u32 (m);
929 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
931 /* Create FIB with index 0 and table id of 0. */
932 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
933 FIB_SOURCE_DEFAULT_ROUTE);
934 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
935 MFIB_SOURCE_DEFAULT_ROUTE);
939 pn = pg_get_node (ip4_lookup_node.index);
940 pn->unformat_edit = unformat_pg_ip4_header;
944 ethernet_arp_header_t h;
946 memset (&h, 0, sizeof (h));
948 /* Set target ethernet address to all zeros. */
949 memset (h.ip4_over_ethernet[1].ethernet, 0,
950 sizeof (h.ip4_over_ethernet[1].ethernet));
952 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
953 #define _8(f,v) h.f = v;
954 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
955 _16 (l3_type, ETHERNET_TYPE_IP4);
956 _8 (n_l2_address_bytes, 6);
957 _8 (n_l3_address_bytes, 4);
958 _16 (opcode, ETHERNET_ARP_OPCODE_request);
962 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
965 /* alloc chunk size */ 8,
972 VLIB_INIT_FUNCTION (ip4_lookup_init);
976 /* Adjacency taken. */
981 /* Packet data, possibly *after* rewrite. */
982 u8 packet_data[64 - 1 * sizeof (u32)];
984 ip4_forward_next_trace_t;
986 #ifndef CLIB_MARCH_VARIANT
988 format_ip4_forward_next_trace (u8 * s, va_list * args)
990 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
991 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
992 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
993 u32 indent = format_get_indent (s);
994 s = format (s, "%U%U",
995 format_white_space, indent,
996 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1002 format_ip4_lookup_trace (u8 * s, va_list * args)
1004 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1005 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1006 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1007 u32 indent = format_get_indent (s);
1009 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1010 t->fib_index, t->dpo_index, t->flow_hash);
1011 s = format (s, "\n%U%U",
1012 format_white_space, indent,
1013 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1018 format_ip4_rewrite_trace (u8 * s, va_list * args)
1020 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1021 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1022 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1023 u32 indent = format_get_indent (s);
1025 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1026 t->fib_index, t->dpo_index, format_ip_adjacency,
1027 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1028 s = format (s, "\n%U%U",
1029 format_white_space, indent,
1030 format_ip_adjacency_packet_data,
1031 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1035 #ifndef CLIB_MARCH_VARIANT
1036 /* Common trace function for all ip4-forward next nodes. */
1038 ip4_forward_next_trace (vlib_main_t * vm,
1039 vlib_node_runtime_t * node,
1040 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1043 ip4_main_t *im = &ip4_main;
1045 n_left = frame->n_vectors;
1046 from = vlib_frame_vector_args (frame);
1051 vlib_buffer_t *b0, *b1;
1052 ip4_forward_next_trace_t *t0, *t1;
1054 /* Prefetch next iteration. */
1055 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1056 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1061 b0 = vlib_get_buffer (vm, bi0);
1062 b1 = vlib_get_buffer (vm, bi1);
1064 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1066 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1067 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1068 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1070 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1071 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1072 vec_elt (im->fib_index_by_sw_if_index,
1073 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1075 clib_memcpy (t0->packet_data,
1076 vlib_buffer_get_current (b0),
1077 sizeof (t0->packet_data));
1079 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1081 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1082 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1083 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1085 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1086 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1087 vec_elt (im->fib_index_by_sw_if_index,
1088 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1089 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1090 sizeof (t1->packet_data));
1100 ip4_forward_next_trace_t *t0;
1104 b0 = vlib_get_buffer (vm, bi0);
1106 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1108 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1109 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1110 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1112 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1113 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1114 vec_elt (im->fib_index_by_sw_if_index,
1115 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1116 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1117 sizeof (t0->packet_data));
1124 /* Compute TCP/UDP/ICMP4 checksum in software. */
1126 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1130 u32 ip_header_length, payload_length_host_byte_order;
1131 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1133 void *data_this_buffer;
1135 /* Initialize checksum with ip header. */
1136 ip_header_length = ip4_header_bytes (ip0);
1137 payload_length_host_byte_order =
1138 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1140 clib_host_to_net_u32 (payload_length_host_byte_order +
1141 (ip0->protocol << 16));
1143 if (BITS (uword) == 32)
1146 ip_csum_with_carry (sum0,
1147 clib_mem_unaligned (&ip0->src_address, u32));
1149 ip_csum_with_carry (sum0,
1150 clib_mem_unaligned (&ip0->dst_address, u32));
1154 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1156 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1157 data_this_buffer = (void *) ip0 + ip_header_length;
1158 n_ip_bytes_this_buffer =
1159 p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1160 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1162 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1163 n_ip_bytes_this_buffer - ip_header_length : 0;
1167 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1168 n_bytes_left -= n_this_buffer;
1169 if (n_bytes_left == 0)
1172 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1173 p0 = vlib_get_buffer (vm, p0->next_buffer);
1174 data_this_buffer = vlib_buffer_get_current (p0);
1175 n_this_buffer = p0->current_length;
1178 sum16 = ~ip_csum_fold (sum0);
1184 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1186 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1190 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1191 || ip0->protocol == IP_PROTOCOL_UDP);
1193 udp0 = (void *) (ip0 + 1);
1194 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1196 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1197 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1201 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1203 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1204 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1211 VNET_FEATURE_ARC_INIT (ip4_local) =
1213 .arc_name = "ip4-local",
1214 .start_nodes = VNET_FEATURES ("ip4-local"),
1219 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1220 ip4_header_t * ip, u8 is_udp, u8 * error,
1224 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1225 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1229 u32 ip_len, udp_len;
1231 udp = ip4_next_header (ip);
1232 /* Verify UDP length. */
1233 ip_len = clib_net_to_host_u16 (ip->length);
1234 udp_len = clib_net_to_host_u16 (udp->length);
1236 len_diff = ip_len - udp_len;
1237 *good_tcp_udp &= len_diff >= 0;
1238 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1242 #define ip4_local_csum_is_offloaded(_b) \
1243 _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \
1244 || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1246 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1247 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1248 || ip4_local_csum_is_offloaded (_b)))
1250 #define ip4_local_csum_is_valid(_b) \
1251 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1252 || (ip4_local_csum_is_offloaded (_b))) != 0
1255 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1256 ip4_header_t * ih, u8 * error)
1258 u8 is_udp, is_tcp_udp, good_tcp_udp;
1260 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1261 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1263 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1264 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1266 good_tcp_udp = ip4_local_csum_is_valid (b);
1268 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1269 *error = (is_tcp_udp && !good_tcp_udp
1270 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1274 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1275 ip4_header_t ** ih, u8 * error)
1277 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1279 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1280 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1282 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1283 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1285 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1286 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1288 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1289 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1292 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1295 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1299 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1300 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1301 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1302 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1306 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1307 vlib_buffer_t * b, u16 * next, u8 error,
1308 u8 head_of_feature_arc)
1310 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1313 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1314 b->error = error ? error_node->errors[error] : 0;
1315 if (head_of_feature_arc)
1318 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1320 vnet_feature_arc_start (arc_index,
1321 vnet_buffer (b)->sw_if_index[VLIB_RX],
1333 } ip4_local_last_check_t;
1336 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1337 ip4_local_last_check_t * last_check, u8 * error0)
1339 ip4_fib_mtrie_leaf_t leaf0;
1340 ip4_fib_mtrie_t *mtrie0;
1341 const dpo_id_t *dpo0;
1342 load_balance_t *lb0;
1345 vnet_buffer (b)->ip.fib_index =
1346 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1347 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1349 if (PREDICT_FALSE (last_check->src.as_u32 != ip0->src_address.as_u32))
1351 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1352 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1353 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1354 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1355 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1357 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1358 vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0;
1360 lb0 = load_balance_get (lbi0);
1361 dpo0 = load_balance_get_bucket_i (lb0, 0);
1364 * Must have a route to source otherwise we drop the packet.
1365 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1368 * - the source is a recieve => it's from us => bogus, do this
1369 * first since it sets a different error code.
1370 * - uRPF check for any route to source - accept if passes.
1371 * - allow packets destined to the broadcast address from unknown sources
1374 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1375 && dpo0->dpoi_type == DPO_RECEIVE) ?
1376 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1377 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1378 && !fib_urpf_check_size (lb0->lb_urpf)
1379 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1380 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1382 last_check->src.as_u32 = ip0->src_address.as_u32;
1383 last_check->lbi = lbi0;
1384 last_check->error = *error0;
1388 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1389 vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi;
1390 *error0 = last_check->error;
1395 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1396 ip4_local_last_check_t * last_check, u8 * error)
1398 ip4_fib_mtrie_leaf_t leaf[2];
1399 ip4_fib_mtrie_t *mtrie[2];
1400 const dpo_id_t *dpo[2];
1401 load_balance_t *lb[2];
1402 u32 not_last_hit = 0;
1405 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1406 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1408 vnet_buffer (b[0])->ip.fib_index =
1409 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1410 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1411 vnet_buffer (b[0])->ip.fib_index;
1413 vnet_buffer (b[1])->ip.fib_index =
1414 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1415 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1416 vnet_buffer (b[1])->ip.fib_index;
1418 if (PREDICT_FALSE (not_last_hit))
1420 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1421 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1423 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1424 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1426 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1427 &ip[0]->src_address, 2);
1428 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1429 &ip[1]->src_address, 2);
1431 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1432 &ip[0]->src_address, 3);
1433 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1434 &ip[1]->src_address, 3);
1436 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1437 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1439 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1440 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0];
1442 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1443 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1];
1445 lb[0] = load_balance_get (lbi[0]);
1446 lb[1] = load_balance_get (lbi[1]);
1448 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1449 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1451 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1452 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1453 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1454 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1455 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1456 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1457 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1459 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1460 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1461 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1462 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1463 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1464 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1465 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1467 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1468 last_check->lbi = lbi[1];
1469 last_check->error = error[1];
1473 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1474 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi;
1476 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1477 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi;
1479 error[0] = last_check->error;
1480 error[1] = last_check->error;
1485 ip4_local_inline (vlib_main_t * vm,
1486 vlib_node_runtime_t * node,
1487 vlib_frame_t * frame, int head_of_feature_arc)
1489 ip4_main_t *im = &ip4_main;
1490 ip_lookup_main_t *lm = &im->lookup_main;
1491 u32 *from, n_left_from;
1492 vlib_node_runtime_t *error_node =
1493 vlib_node_get_runtime (vm, ip4_input_node.index);
1494 u16 nexts[VLIB_FRAME_SIZE], *next;
1495 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1496 ip4_header_t *ip[2];
1499 ip4_local_last_check_t last_check = {
1500 .src = {.as_u32 = 0},
1502 .error = IP4_ERROR_UNKNOWN_PROTOCOL
1505 from = vlib_frame_vector_args (frame);
1506 n_left_from = frame->n_vectors;
1508 if (node->flags & VLIB_NODE_FLAG_TRACE)
1509 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1511 vlib_get_buffers (vm, from, bufs, n_left_from);
1515 while (n_left_from >= 6)
1517 u32 is_nat, not_batch = 0;
1519 /* Prefetch next iteration. */
1521 vlib_prefetch_buffer_header (b[4], LOAD);
1522 vlib_prefetch_buffer_header (b[5], LOAD);
1524 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1525 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1528 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1530 ip[0] = vlib_buffer_get_current (b[0]);
1531 ip[1] = vlib_buffer_get_current (b[1]);
1533 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1534 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1536 is_nat = b[0]->flags & VNET_BUFFER_F_IS_NATED;
1537 not_batch |= is_nat ^ (b[1]->flags & VNET_BUFFER_F_IS_NATED);
1539 if (head_of_feature_arc == 0 || (is_nat && not_batch == 0))
1542 if (PREDICT_TRUE (not_batch == 0))
1544 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1545 ip4_local_check_src_x2 (b, ip, &last_check, error);
1549 if (!(b[0]->flags & VNET_BUFFER_F_IS_NATED))
1551 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1552 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1554 if (!(b[1]->flags & VNET_BUFFER_F_IS_NATED))
1556 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1557 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1563 next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1564 next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1565 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1566 head_of_feature_arc);
1567 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1568 head_of_feature_arc);
1575 while (n_left_from > 0)
1577 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1579 ip[0] = vlib_buffer_get_current (b[0]);
1580 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1582 if (head_of_feature_arc == 0 || (b[0]->flags & VNET_BUFFER_F_IS_NATED))
1585 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1586 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1590 next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1591 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1592 head_of_feature_arc);
1599 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1600 return frame->n_vectors;
1603 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1604 vlib_frame_t * frame)
1606 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1610 VLIB_REGISTER_NODE (ip4_local_node) =
1612 .name = "ip4-local",
1613 .vector_size = sizeof (u32),
1614 .format_trace = format_ip4_forward_next_trace,
1615 .n_next_nodes = IP_LOCAL_N_NEXT,
1618 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1619 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1620 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1621 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1627 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1628 vlib_node_runtime_t * node,
1629 vlib_frame_t * frame)
1631 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1635 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1636 .name = "ip4-local-end-of-arc",
1637 .vector_size = sizeof (u32),
1639 .format_trace = format_ip4_forward_next_trace,
1640 .sibling_of = "ip4-local",
1643 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1644 .arc_name = "ip4-local",
1645 .node_name = "ip4-local-end-of-arc",
1646 .runs_before = 0, /* not before any other features */
1650 #ifndef CLIB_MARCH_VARIANT
1652 ip4_register_protocol (u32 protocol, u32 node_index)
1654 vlib_main_t *vm = vlib_get_main ();
1655 ip4_main_t *im = &ip4_main;
1656 ip_lookup_main_t *lm = &im->lookup_main;
1658 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1659 lm->local_next_by_ip_protocol[protocol] =
1660 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1664 static clib_error_t *
1665 show_ip_local_command_fn (vlib_main_t * vm,
1666 unformat_input_t * input, vlib_cli_command_t * cmd)
1668 ip4_main_t *im = &ip4_main;
1669 ip_lookup_main_t *lm = &im->lookup_main;
1672 vlib_cli_output (vm, "Protocols handled by ip4_local");
1673 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1675 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1677 u32 node_index = vlib_get_node (vm,
1678 ip4_local_node.index)->
1679 next_nodes[lm->local_next_by_ip_protocol[i]];
1680 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1690 * Display the set of protocols handled by the local IPv4 stack.
1693 * Example of how to display local protocol table:
1694 * @cliexstart{show ip local}
1695 * Protocols handled by ip4_local
1702 VLIB_CLI_COMMAND (show_ip_local, static) =
1704 .path = "show ip local",
1705 .function = show_ip_local_command_fn,
1706 .short_help = "show ip local",
1711 ip4_arp_inline (vlib_main_t * vm,
1712 vlib_node_runtime_t * node,
1713 vlib_frame_t * frame, int is_glean)
1715 vnet_main_t *vnm = vnet_get_main ();
1716 ip4_main_t *im = &ip4_main;
1717 ip_lookup_main_t *lm = &im->lookup_main;
1718 u32 *from, *to_next_drop;
1719 uword n_left_from, n_left_to_next_drop, next_index;
1720 u32 thread_index = vm->thread_index;
1723 if (node->flags & VLIB_NODE_FLAG_TRACE)
1724 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1726 seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
1728 from = vlib_frame_vector_args (frame);
1729 n_left_from = frame->n_vectors;
1730 next_index = node->cached_next_index;
1731 if (next_index == IP4_ARP_NEXT_DROP)
1732 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1734 while (n_left_from > 0)
1736 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1737 to_next_drop, n_left_to_next_drop);
1739 while (n_left_from > 0 && n_left_to_next_drop > 0)
1741 u32 pi0, adj_index0, r0, sw_if_index0, drop0;
1742 ip_adjacency_t *adj0;
1748 p0 = vlib_get_buffer (vm, pi0);
1750 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1751 adj0 = adj_get (adj_index0);
1752 ip0 = vlib_buffer_get_current (p0);
1754 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1755 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1757 if (PREDICT_TRUE (is_glean))
1760 * this is the Glean case, so we are ARPing for the
1761 * packet's destination
1763 r0 = ip0->dst_address.data_u32;
1767 r0 = adj0->sub_type.nbr.next_hop.ip4.data_u32;
1770 drop0 = throttle_check (&im->arp_throttle, thread_index, r0, seed);
1774 to_next_drop[0] = pi0;
1776 n_left_to_next_drop -= 1;
1779 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
1780 IP4_ARP_ERROR_REQUEST_SENT];
1783 * the adj has been updated to a rewrite but the node the DPO that got
1784 * us here hasn't - yet. no big deal. we'll drop while we wait.
1786 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1793 * Can happen if the control-plane is programming tables
1794 * with traffic flowing; at least that's today's lame excuse.
1796 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1797 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1799 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1802 /* Send ARP request. */
1806 ethernet_arp_header_t *h0;
1807 vnet_hw_interface_t *hw_if0;
1810 vlib_packet_template_get_packet (vm,
1811 &im->ip4_arp_request_packet_template,
1814 /* Seems we're out of buffers */
1815 if (PREDICT_FALSE (!h0))
1818 /* Add rewrite/encap string for ARP packet. */
1819 vnet_rewrite_one_header (adj0[0], h0,
1820 sizeof (ethernet_header_t));
1822 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1824 /* Src ethernet address in ARP header. */
1825 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
1827 sizeof (h0->ip4_over_ethernet[0].ethernet));
1831 /* The interface's source address is stashed in the Glean Adj */
1832 h0->ip4_over_ethernet[0].ip4 =
1833 adj0->sub_type.glean.receive_addr.ip4;
1835 /* Copy in destination address we are requesting. This is the
1836 * glean case, so it's the packet's destination.*/
1837 h0->ip4_over_ethernet[1].ip4.data_u32 =
1838 ip0->dst_address.data_u32;
1842 /* Src IP address in ARP header. */
1843 if (ip4_src_address_for_packet (lm, sw_if_index0,
1845 ip4_over_ethernet[0].ip4))
1847 /* No source address available */
1849 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1850 vlib_buffer_free (vm, &bi0, 1);
1854 /* Copy in destination address we are requesting from the
1856 h0->ip4_over_ethernet[1].ip4.data_u32 =
1857 adj0->sub_type.nbr.next_hop.ip4.as_u32;
1860 vlib_buffer_copy_trace_flag (vm, p0, bi0);
1861 b0 = vlib_get_buffer (vm, bi0);
1862 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1863 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1865 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1867 vlib_set_next_frame_buffer (vm, node,
1868 adj0->rewrite_header.next_index,
1873 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1876 return frame->n_vectors;
1879 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1880 vlib_frame_t * frame)
1882 return (ip4_arp_inline (vm, node, frame, 0));
1885 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1886 vlib_frame_t * frame)
1888 return (ip4_arp_inline (vm, node, frame, 1));
1891 static char *ip4_arp_error_strings[] = {
1892 [IP4_ARP_ERROR_DROP] = "address overflow drops",
1893 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1894 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1895 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
1896 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
1897 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1901 VLIB_REGISTER_NODE (ip4_arp_node) =
1904 .vector_size = sizeof (u32),
1905 .format_trace = format_ip4_forward_next_trace,
1906 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1907 .error_strings = ip4_arp_error_strings,
1908 .n_next_nodes = IP4_ARP_N_NEXT,
1911 [IP4_ARP_NEXT_DROP] = "error-drop",
1915 VLIB_REGISTER_NODE (ip4_glean_node) =
1917 .name = "ip4-glean",
1918 .vector_size = sizeof (u32),
1919 .format_trace = format_ip4_forward_next_trace,
1920 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1921 .error_strings = ip4_arp_error_strings,
1922 .n_next_nodes = IP4_ARP_N_NEXT,
1924 [IP4_ARP_NEXT_DROP] = "error-drop",
1929 #define foreach_notrace_ip4_arp_error \
1935 static clib_error_t *
1936 arp_notrace_init (vlib_main_t * vm)
1938 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1940 /* don't trace ARP request packets */
1942 vnet_pcap_drop_trace_filter_add_del \
1943 (rt->errors[IP4_ARP_ERROR_##a], \
1945 foreach_notrace_ip4_arp_error;
1950 VLIB_INIT_FUNCTION (arp_notrace_init);
1953 #ifndef CLIB_MARCH_VARIANT
1954 /* Send an ARP request to see if given destination is reachable on given interface. */
1956 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1959 vnet_main_t *vnm = vnet_get_main ();
1960 ip4_main_t *im = &ip4_main;
1961 ethernet_arp_header_t *h;
1963 ip_interface_address_t *ia;
1964 ip_adjacency_t *adj;
1965 vnet_hw_interface_t *hi;
1966 vnet_sw_interface_t *si;
1970 u8 unicast_rewrite = 0;
1972 si = vnet_get_sw_interface (vnm, sw_if_index);
1974 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1976 return clib_error_return (0, "%U: interface %U down",
1977 format_ip4_address, dst,
1978 format_vnet_sw_if_index_name, vnm,
1983 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1986 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1987 return clib_error_return
1989 "no matching interface address for destination %U (interface %U)",
1990 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
1994 h = vlib_packet_template_get_packet (vm,
1995 &im->ip4_arp_request_packet_template,
1999 return clib_error_return (0, "ARP request packet allocation failed");
2001 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2002 if (PREDICT_FALSE (!hi->hw_address))
2004 return clib_error_return (0, "%U: interface %U do not support ip probe",
2005 format_ip4_address, dst,
2006 format_vnet_sw_if_index_name, vnm,
2010 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2011 sizeof (h->ip4_over_ethernet[0].ethernet));
2013 h->ip4_over_ethernet[0].ip4 = src[0];
2014 h->ip4_over_ethernet[1].ip4 = dst[0];
2016 b = vlib_get_buffer (vm, bi);
2017 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2018 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2020 ip46_address_t nh = {
2024 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2025 VNET_LINK_IP4, &nh, sw_if_index);
2028 /* Peer has been previously resolved, retrieve glean adj instead */
2029 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2032 unicast_rewrite = 1;
2036 ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
2037 VNET_LINK_IP4, sw_if_index, &nh);
2042 /* Add encapsulation string for software interface (e.g. ethernet header). */
2043 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2044 if (unicast_rewrite)
2046 u16 *etype = vlib_buffer_get_current (b) - 2;
2047 etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2049 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2052 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2053 u32 *to_next = vlib_frame_vector_args (f);
2056 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2060 return /* no error */ 0;
2066 IP4_REWRITE_NEXT_DROP,
2067 IP4_REWRITE_NEXT_ICMP_ERROR,
2068 IP4_REWRITE_NEXT_FRAGMENT,
2069 IP4_REWRITE_N_NEXT /* Last */
2070 } ip4_rewrite_next_t;
2073 * This bits of an IPv4 address to mask to construct a multicast
2076 #if CLIB_ARCH_IS_BIG_ENDIAN
2077 #define IP4_MCAST_ADDR_MASK 0x007fffff
2079 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2083 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2084 u16 adj_packet_bytes, bool df, u16 * next, u32 * error)
2086 if (packet_len > adj_packet_bytes)
2088 *error = IP4_ERROR_MTU_EXCEEDED;
2091 icmp4_error_set_vnet_buffer
2092 (b, ICMP4_destination_unreachable,
2093 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2095 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2099 /* IP fragmentation */
2100 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2101 IP4_FRAG_NEXT_IP4_REWRITE, 0);
2102 *next = IP4_REWRITE_NEXT_FRAGMENT;
2107 /* Decrement TTL & update checksum.
2108 Works either endian, so no need for byte swap. */
2109 static_always_inline void
2110 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2115 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2117 b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2123 /* Input node should have reject packets with ttl 0. */
2124 ASSERT (ip->ttl > 0);
2126 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2127 checksum += checksum >= 0xffff;
2129 ip->checksum = checksum;
2134 * If the ttl drops below 1 when forwarding, generate
2137 if (PREDICT_FALSE (ttl <= 0))
2139 *error = IP4_ERROR_TIME_EXPIRED;
2140 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2141 icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2142 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2144 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2147 /* Verify checksum. */
2148 ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2149 (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2154 ip4_rewrite_inline (vlib_main_t * vm,
2155 vlib_node_runtime_t * node,
2156 vlib_frame_t * frame,
2157 int do_counters, int is_midchain, int is_mcast)
2159 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2160 u32 *from = vlib_frame_vector_args (frame);
2161 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2162 u16 nexts[VLIB_FRAME_SIZE], *next;
2164 vlib_node_runtime_t *error_node =
2165 vlib_node_get_runtime (vm, ip4_input_node.index);
2167 n_left_from = frame->n_vectors;
2168 u32 thread_index = vm->thread_index;
2170 vlib_get_buffers (vm, from, bufs, n_left_from);
2171 clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2173 if (n_left_from >= 6)
2176 for (i = 0; i < 6; i++)
2177 vlib_prefetch_buffer_header (bufs[i], LOAD);
2182 while (n_left_from >= 8)
2184 ip_adjacency_t *adj0, *adj1;
2185 ip4_header_t *ip0, *ip1;
2186 u32 rw_len0, error0, adj_index0;
2187 u32 rw_len1, error1, adj_index1;
2188 u32 tx_sw_if_index0, tx_sw_if_index1;
2191 vlib_prefetch_buffer_header (b[6], LOAD);
2192 vlib_prefetch_buffer_header (b[7], LOAD);
2194 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2195 adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2198 * pre-fetch the per-adjacency counters
2202 vlib_prefetch_combined_counter (&adjacency_counters,
2203 thread_index, adj_index0);
2204 vlib_prefetch_combined_counter (&adjacency_counters,
2205 thread_index, adj_index1);
2208 ip0 = vlib_buffer_get_current (b[0]);
2209 ip1 = vlib_buffer_get_current (b[1]);
2211 error0 = error1 = IP4_ERROR_NONE;
2213 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2214 ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2216 /* Rewrite packet header and updates lengths. */
2217 adj0 = adj_get (adj_index0);
2218 adj1 = adj_get (adj_index1);
2220 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2221 rw_len0 = adj0[0].rewrite_header.data_bytes;
2222 rw_len1 = adj1[0].rewrite_header.data_bytes;
2223 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2224 vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2226 p = vlib_buffer_get_current (b[2]);
2227 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2228 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2230 p = vlib_buffer_get_current (b[3]);
2231 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2232 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2234 /* Check MTU of outgoing interface. */
2235 ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2236 adj0[0].rewrite_header.max_l3_packet_bytes,
2237 ip0->flags_and_fragment_offset &
2238 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2240 ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
2241 adj1[0].rewrite_header.max_l3_packet_bytes,
2242 ip1->flags_and_fragment_offset &
2243 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2248 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2249 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2250 IP4_ERROR_SAME_INTERFACE : error0);
2251 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2252 vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2253 IP4_ERROR_SAME_INTERFACE : error1);
2256 b[0]->error = error_node->errors[error0];
2257 b[1]->error = error_node->errors[error1];
2258 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2259 * to see the IP headerr */
2260 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2262 u32 next_index = adj0[0].rewrite_header.next_index;
2263 b[0]->current_data -= rw_len0;
2264 b[0]->current_length += rw_len0;
2265 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2266 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2269 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2270 vnet_feature_arc_start (lm->output_feature_arc_index,
2271 tx_sw_if_index0, &next_index, b[0]);
2272 next[0] = next_index;
2274 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2276 u32 next_index = adj1[0].rewrite_header.next_index;
2277 b[1]->current_data -= rw_len1;
2278 b[1]->current_length += rw_len1;
2280 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2281 vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2284 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2285 vnet_feature_arc_start (lm->output_feature_arc_index,
2286 tx_sw_if_index1, &next_index, b[1]);
2287 next[1] = next_index;
2290 /* Guess we are only writing on simple Ethernet header. */
2291 vnet_rewrite_two_headers (adj0[0], adj1[0],
2292 ip0, ip1, sizeof (ethernet_header_t));
2295 * Bump the per-adjacency counters
2299 vlib_increment_combined_counter
2300 (&adjacency_counters,
2302 adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2304 vlib_increment_combined_counter
2305 (&adjacency_counters,
2307 adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2312 adj0->sub_type.midchain.fixup_func
2313 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2314 adj1->sub_type.midchain.fixup_func
2315 (vm, adj1, b[1], adj0->sub_type.midchain.fixup_data);
2321 * copy bytes from the IP address into the MAC rewrite
2323 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2324 adj0->rewrite_header.dst_mcast_offset,
2325 &ip0->dst_address.as_u32, (u8 *) ip0);
2326 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2327 adj0->rewrite_header.dst_mcast_offset,
2328 &ip1->dst_address.as_u32, (u8 *) ip1);
2336 while (n_left_from > 0)
2338 ip_adjacency_t *adj0;
2340 u32 rw_len0, adj_index0, error0;
2341 u32 tx_sw_if_index0;
2343 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2345 adj0 = adj_get (adj_index0);
2348 vlib_prefetch_combined_counter (&adjacency_counters,
2349 thread_index, adj_index0);
2351 ip0 = vlib_buffer_get_current (b[0]);
2353 error0 = IP4_ERROR_NONE;
2355 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2358 /* Update packet buffer attributes/set output interface. */
2359 rw_len0 = adj0[0].rewrite_header.data_bytes;
2360 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2362 /* Check MTU of outgoing interface. */
2363 ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2364 adj0[0].rewrite_header.max_l3_packet_bytes,
2365 ip0->flags_and_fragment_offset &
2366 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2371 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2372 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2373 IP4_ERROR_SAME_INTERFACE : error0);
2375 b[0]->error = error_node->errors[error0];
2377 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2378 * to see the IP headerr */
2379 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2381 u32 next_index = adj0[0].rewrite_header.next_index;
2382 b[0]->current_data -= rw_len0;
2383 b[0]->current_length += rw_len0;
2384 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2385 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2388 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2389 vnet_feature_arc_start (lm->output_feature_arc_index,
2390 tx_sw_if_index0, &next_index, b[0]);
2391 next[0] = next_index;
2394 /* Guess we are only writing on simple Ethernet header. */
2395 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2398 vlib_increment_combined_counter
2399 (&adjacency_counters,
2400 thread_index, adj_index0, 1,
2401 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2405 adj0->sub_type.midchain.fixup_func
2406 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2412 * copy bytes from the IP address into the MAC rewrite
2414 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2415 adj0->rewrite_header.dst_mcast_offset,
2416 &ip0->dst_address.as_u32, (u8 *) ip0);
2425 /* Need to do trace after rewrites to pick up new packet data. */
2426 if (node->flags & VLIB_NODE_FLAG_TRACE)
2427 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2429 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2430 return frame->n_vectors;
2434 /** @brief IPv4 rewrite node.
2437 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2438 header checksum, fetch the ip adjacency, check the outbound mtu,
2439 apply the adjacency rewrite, and send pkts to the adjacency
2440 rewrite header's rewrite_next_index.
2442 @param vm vlib_main_t corresponding to the current thread
2443 @param node vlib_node_runtime_t
2444 @param frame vlib_frame_t whose contents should be dispatched
2446 @par Graph mechanics: buffer metadata, next index usage
2449 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2450 - the rewrite adjacency index
2451 - <code>adj->lookup_next_index</code>
2452 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2453 the packet will be dropped.
2454 - <code>adj->rewrite_header</code>
2455 - Rewrite string length, rewrite string, next_index
2458 - <code>b->current_data, b->current_length</code>
2459 - Updated net of applying the rewrite string
2461 <em>Next Indices:</em>
2462 - <code> adj->rewrite_header.next_index </code>
2466 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2467 vlib_frame_t * frame)
2469 if (adj_are_counters_enabled ())
2470 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2472 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2475 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2476 vlib_node_runtime_t * node,
2477 vlib_frame_t * frame)
2479 if (adj_are_counters_enabled ())
2480 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2482 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2485 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2486 vlib_node_runtime_t * node,
2487 vlib_frame_t * frame)
2489 if (adj_are_counters_enabled ())
2490 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2492 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2495 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2496 vlib_node_runtime_t * node,
2497 vlib_frame_t * frame)
2499 if (adj_are_counters_enabled ())
2500 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2502 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2505 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2506 vlib_node_runtime_t * node,
2507 vlib_frame_t * frame)
2509 if (adj_are_counters_enabled ())
2510 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2512 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2516 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2517 .name = "ip4-rewrite",
2518 .vector_size = sizeof (u32),
2520 .format_trace = format_ip4_rewrite_trace,
2522 .n_next_nodes = IP4_REWRITE_N_NEXT,
2524 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2525 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2526 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2530 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2531 .name = "ip4-rewrite-bcast",
2532 .vector_size = sizeof (u32),
2534 .format_trace = format_ip4_rewrite_trace,
2535 .sibling_of = "ip4-rewrite",
2538 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2539 .name = "ip4-rewrite-mcast",
2540 .vector_size = sizeof (u32),
2542 .format_trace = format_ip4_rewrite_trace,
2543 .sibling_of = "ip4-rewrite",
2546 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2547 .name = "ip4-mcast-midchain",
2548 .vector_size = sizeof (u32),
2550 .format_trace = format_ip4_rewrite_trace,
2551 .sibling_of = "ip4-rewrite",
2554 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2555 .name = "ip4-midchain",
2556 .vector_size = sizeof (u32),
2557 .format_trace = format_ip4_forward_next_trace,
2558 .sibling_of = "ip4-rewrite",
2563 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2565 ip4_fib_mtrie_t *mtrie0;
2566 ip4_fib_mtrie_leaf_t leaf0;
2569 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2571 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2572 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2573 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2575 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2577 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2580 static clib_error_t *
2581 test_lookup_command_fn (vlib_main_t * vm,
2582 unformat_input_t * input, vlib_cli_command_t * cmd)
2589 ip4_address_t ip4_base_address;
2592 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2594 if (unformat (input, "table %d", &table_id))
2596 /* Make sure the entry exists. */
2597 fib = ip4_fib_get (table_id);
2598 if ((fib) && (fib->index != table_id))
2599 return clib_error_return (0, "<fib-index> %d does not exist",
2602 else if (unformat (input, "count %f", &count))
2605 else if (unformat (input, "%U",
2606 unformat_ip4_address, &ip4_base_address))
2609 return clib_error_return (0, "unknown input `%U'",
2610 format_unformat_error, input);
2615 for (i = 0; i < n; i++)
2617 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2620 ip4_base_address.as_u32 =
2621 clib_host_to_net_u32 (1 +
2622 clib_net_to_host_u32 (ip4_base_address.as_u32));
2626 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2628 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2634 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2635 * given FIB table to determine if there is a conflict with the
2636 * adjacency table. The fib-id can be determined by using the
2637 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2640 * @todo This command uses fib-id, other commands use table-id (not
2641 * just a name, they are different indexes). Would like to change this
2642 * to table-id for consistency.
2645 * Example of how to run the test lookup command:
2646 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2647 * No errors in 2 lookups
2651 VLIB_CLI_COMMAND (lookup_test_command, static) =
2653 .path = "test lookup",
2654 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2655 .function = test_lookup_command_fn,
2659 #ifndef CLIB_MARCH_VARIANT
2661 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2665 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2667 if (~0 == fib_index)
2668 return VNET_API_ERROR_NO_SUCH_FIB;
2670 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2677 static clib_error_t *
2678 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2679 unformat_input_t * input,
2680 vlib_cli_command_t * cmd)
2684 u32 flow_hash_config = 0;
2687 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2689 if (unformat (input, "table %d", &table_id))
2692 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2693 foreach_flow_hash_bit
2700 return clib_error_return (0, "unknown input `%U'",
2701 format_unformat_error, input);
2703 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2709 case VNET_API_ERROR_NO_SUCH_FIB:
2710 return clib_error_return (0, "no such FIB table %d", table_id);
2713 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2721 * Configure the set of IPv4 fields used by the flow hash.
2724 * Example of how to set the flow hash on a given table:
2725 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2726 * Example of display the configured flow hash:
2727 * @cliexstart{show ip fib}
2728 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2731 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2732 * [0] [@0]: dpo-drop ip6
2735 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2736 * [0] [@0]: dpo-drop ip6
2739 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2740 * [0] [@0]: dpo-drop ip6
2743 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2744 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2747 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2748 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2749 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2750 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2751 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2754 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2755 * [0] [@0]: dpo-drop ip6
2756 * 255.255.255.255/32
2758 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2759 * [0] [@0]: dpo-drop ip6
2760 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2763 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2764 * [0] [@0]: dpo-drop ip6
2767 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2768 * [0] [@0]: dpo-drop ip6
2771 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2772 * [0] [@4]: ipv4-glean: af_packet0
2775 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2776 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2779 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2780 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2783 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2784 * [0] [@4]: ipv4-glean: af_packet1
2787 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2788 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2791 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2792 * [0] [@0]: dpo-drop ip6
2795 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2796 * [0] [@0]: dpo-drop ip6
2797 * 255.255.255.255/32
2799 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2800 * [0] [@0]: dpo-drop ip6
2804 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2806 .path = "set ip flow-hash",
2808 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2809 .function = set_ip_flow_hash_command_fn,
2813 #ifndef CLIB_MARCH_VARIANT
2815 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2818 vnet_main_t *vnm = vnet_get_main ();
2819 vnet_interface_main_t *im = &vnm->interface_main;
2820 ip4_main_t *ipm = &ip4_main;
2821 ip_lookup_main_t *lm = &ipm->lookup_main;
2822 vnet_classify_main_t *cm = &vnet_classify_main;
2823 ip4_address_t *if_addr;
2825 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2826 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2828 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2829 return VNET_API_ERROR_NO_SUCH_ENTRY;
2831 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2832 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2834 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2836 if (NULL != if_addr)
2838 fib_prefix_t pfx = {
2840 .fp_proto = FIB_PROTOCOL_IP4,
2841 .fp_addr.ip4 = *if_addr,
2845 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2849 if (table_index != (u32) ~ 0)
2851 dpo_id_t dpo = DPO_INVALID;
2856 classify_dpo_create (DPO_PROTO_IP4, table_index));
2858 fib_table_entry_special_dpo_add (fib_index,
2860 FIB_SOURCE_CLASSIFY,
2861 FIB_ENTRY_FLAG_NONE, &dpo);
2866 fib_table_entry_special_remove (fib_index,
2867 &pfx, FIB_SOURCE_CLASSIFY);
2875 static clib_error_t *
2876 set_ip_classify_command_fn (vlib_main_t * vm,
2877 unformat_input_t * input,
2878 vlib_cli_command_t * cmd)
2880 u32 table_index = ~0;
2881 int table_index_set = 0;
2882 u32 sw_if_index = ~0;
2885 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2887 if (unformat (input, "table-index %d", &table_index))
2888 table_index_set = 1;
2889 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2890 vnet_get_main (), &sw_if_index))
2896 if (table_index_set == 0)
2897 return clib_error_return (0, "classify table-index must be specified");
2899 if (sw_if_index == ~0)
2900 return clib_error_return (0, "interface / subif must be specified");
2902 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2909 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2910 return clib_error_return (0, "No such interface");
2912 case VNET_API_ERROR_NO_SUCH_ENTRY:
2913 return clib_error_return (0, "No such classifier table");
2919 * Assign a classification table to an interface. The classification
2920 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2921 * commands. Once the table is create, use this command to filter packets
2925 * Example of how to assign a classification table to an interface:
2926 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2929 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2931 .path = "set ip classify",
2933 "set ip classify intfc <interface> table-index <classify-idx>",
2934 .function = set_ip_classify_command_fn,
2938 static clib_error_t *
2939 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2941 ip4_main_t *im = &ip4_main;
2944 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2946 if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2949 return clib_error_return (0,
2950 "invalid heap-size parameter `%U'",
2951 format_unformat_error, input);
2954 im->mtrie_heap_size = heapsize;
2959 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2962 * fd.io coding-style-patch-verification: ON
2965 * eval: (c-set-style "gnu")