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 while (n_left_from > 0)
128 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
131 while (n_left_from >= 4 && n_left_to_next >= 2)
133 ip_lookup_next_t next0, next1;
134 const load_balance_t *lb0, *lb1;
135 vlib_buffer_t *p0, *p1;
136 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
137 const ip4_header_t *ip0, *ip1;
138 const dpo_id_t *dpo0, *dpo1;
140 /* Prefetch next iteration. */
142 vlib_buffer_t *p2, *p3;
144 p2 = vlib_get_buffer (vm, from[2]);
145 p3 = vlib_get_buffer (vm, from[3]);
147 vlib_prefetch_buffer_header (p2, STORE);
148 vlib_prefetch_buffer_header (p3, STORE);
150 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
151 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
154 pi0 = to_next[0] = from[0];
155 pi1 = to_next[1] = from[1];
162 p0 = vlib_get_buffer (vm, pi0);
163 p1 = vlib_get_buffer (vm, pi1);
165 ip0 = vlib_buffer_get_current (p0);
166 ip1 = vlib_buffer_get_current (p1);
167 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
168 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
170 lb0 = load_balance_get (lbi0);
171 lb1 = load_balance_get (lbi1);
174 * this node is for via FIBs we can re-use the hash value from the
175 * to node if present.
176 * We don't want to use the same hash value at each level in the recursion
177 * graph as that would lead to polarisation
181 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
183 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
185 hc0 = vnet_buffer (p0)->ip.flow_hash =
186 vnet_buffer (p0)->ip.flow_hash >> 1;
190 hc0 = vnet_buffer (p0)->ip.flow_hash =
191 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
193 dpo0 = load_balance_get_fwd_bucket
194 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
198 dpo0 = load_balance_get_bucket_i (lb0, 0);
200 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
202 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
204 hc1 = vnet_buffer (p1)->ip.flow_hash =
205 vnet_buffer (p1)->ip.flow_hash >> 1;
209 hc1 = vnet_buffer (p1)->ip.flow_hash =
210 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
212 dpo1 = load_balance_get_fwd_bucket
213 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
217 dpo1 = load_balance_get_bucket_i (lb1, 0);
220 next0 = dpo0->dpoi_next_node;
221 next1 = dpo1->dpoi_next_node;
223 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
224 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
226 vlib_increment_combined_counter
227 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
228 vlib_increment_combined_counter
229 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
231 vlib_validate_buffer_enqueue_x2 (vm, node, next,
232 to_next, n_left_to_next,
233 pi0, pi1, next0, next1);
236 while (n_left_from > 0 && n_left_to_next > 0)
238 ip_lookup_next_t next0;
239 const load_balance_t *lb0;
242 const ip4_header_t *ip0;
243 const dpo_id_t *dpo0;
252 p0 = vlib_get_buffer (vm, pi0);
254 ip0 = vlib_buffer_get_current (p0);
255 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
257 lb0 = load_balance_get (lbi0);
260 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
262 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
264 hc0 = vnet_buffer (p0)->ip.flow_hash =
265 vnet_buffer (p0)->ip.flow_hash >> 1;
269 hc0 = vnet_buffer (p0)->ip.flow_hash =
270 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
272 dpo0 = load_balance_get_fwd_bucket
273 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
277 dpo0 = load_balance_get_bucket_i (lb0, 0);
280 next0 = dpo0->dpoi_next_node;
281 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
283 vlib_increment_combined_counter
284 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
286 vlib_validate_buffer_enqueue_x1 (vm, node, next,
287 to_next, n_left_to_next,
291 vlib_put_next_frame (vm, node, next, n_left_to_next);
294 if (node->flags & VLIB_NODE_FLAG_TRACE)
295 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
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 .last_in_arc = "ip4-lookup",
715 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
718 VNET_FEATURE_INIT (ip4_flow_classify, static) =
720 .arc_name = "ip4-unicast",
721 .node_name = "ip4-flow-classify",
722 .runs_before = VNET_FEATURES ("ip4-inacl"),
725 VNET_FEATURE_INIT (ip4_inacl, static) =
727 .arc_name = "ip4-unicast",
728 .node_name = "ip4-inacl",
729 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
732 VNET_FEATURE_INIT (ip4_source_check_1, static) =
734 .arc_name = "ip4-unicast",
735 .node_name = "ip4-source-check-via-rx",
736 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
739 VNET_FEATURE_INIT (ip4_source_check_2, static) =
741 .arc_name = "ip4-unicast",
742 .node_name = "ip4-source-check-via-any",
743 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
746 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
748 .arc_name = "ip4-unicast",
749 .node_name = "ip4-source-and-port-range-check-rx",
750 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
753 VNET_FEATURE_INIT (ip4_policer_classify, static) =
755 .arc_name = "ip4-unicast",
756 .node_name = "ip4-policer-classify",
757 .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
760 VNET_FEATURE_INIT (ip4_ipsec, static) =
762 .arc_name = "ip4-unicast",
763 .node_name = "ipsec4-input-feature",
764 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
767 VNET_FEATURE_INIT (ip4_vpath, static) =
769 .arc_name = "ip4-unicast",
770 .node_name = "vpath-input-ip4",
771 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
774 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
776 .arc_name = "ip4-unicast",
777 .node_name = "ip4-vxlan-bypass",
778 .runs_before = VNET_FEATURES ("ip4-lookup"),
781 VNET_FEATURE_INIT (ip4_not_enabled, static) =
783 .arc_name = "ip4-unicast",
784 .node_name = "ip4-not-enabled",
785 .runs_before = VNET_FEATURES ("ip4-lookup"),
788 VNET_FEATURE_INIT (ip4_lookup, static) =
790 .arc_name = "ip4-unicast",
791 .node_name = "ip4-lookup",
792 .runs_before = 0, /* not before any other features */
795 /* Built-in ip4 multicast rx feature path definition */
796 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
798 .arc_name = "ip4-multicast",
799 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
800 .last_in_arc = "ip4-mfib-forward-lookup",
801 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
804 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
806 .arc_name = "ip4-multicast",
807 .node_name = "vpath-input-ip4",
808 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
811 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
813 .arc_name = "ip4-multicast",
814 .node_name = "ip4-not-enabled",
815 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
818 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
820 .arc_name = "ip4-multicast",
821 .node_name = "ip4-mfib-forward-lookup",
822 .runs_before = 0, /* last feature */
825 /* Source and port-range check ip4 tx feature path definition */
826 VNET_FEATURE_ARC_INIT (ip4_output, static) =
828 .arc_name = "ip4-output",
829 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
830 .last_in_arc = "interface-output",
831 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
834 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
836 .arc_name = "ip4-output",
837 .node_name = "ip4-source-and-port-range-check-tx",
838 .runs_before = VNET_FEATURES ("ip4-outacl"),
841 VNET_FEATURE_INIT (ip4_outacl, static) =
843 .arc_name = "ip4-output",
844 .node_name = "ip4-outacl",
845 .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
848 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
850 .arc_name = "ip4-output",
851 .node_name = "ipsec4-output-feature",
852 .runs_before = VNET_FEATURES ("interface-output"),
855 /* Built-in ip4 tx feature path definition */
856 VNET_FEATURE_INIT (ip4_interface_output, static) =
858 .arc_name = "ip4-output",
859 .node_name = "interface-output",
860 .runs_before = 0, /* not before any other features */
864 static clib_error_t *
865 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
867 ip4_main_t *im = &ip4_main;
869 /* Fill in lookup tables with default table (0). */
870 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
871 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
875 ip4_main_t *im4 = &ip4_main;
876 ip_lookup_main_t *lm4 = &im4->lookup_main;
877 ip_interface_address_t *ia = 0;
878 ip4_address_t *address;
879 vlib_main_t *vm = vlib_get_main ();
881 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
883 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
885 address = ip_interface_address_get_address (lm4, ia);
886 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
891 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
894 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
895 sw_if_index, is_add, 0, 0);
897 return /* no error */ 0;
900 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
902 /* Global IP4 main. */
905 static clib_error_t *
906 ip4_lookup_init (vlib_main_t * vm)
908 ip4_main_t *im = &ip4_main;
912 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
914 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
916 if ((error = vlib_call_init_function (vm, fib_module_init)))
918 if ((error = vlib_call_init_function (vm, mfib_module_init)))
921 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
926 m = pow2_mask (i) << (32 - i);
929 im->fib_masks[i] = clib_host_to_net_u32 (m);
932 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
934 /* Create FIB with index 0 and table id of 0. */
935 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
936 FIB_SOURCE_DEFAULT_ROUTE);
937 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
938 MFIB_SOURCE_DEFAULT_ROUTE);
942 pn = pg_get_node (ip4_lookup_node.index);
943 pn->unformat_edit = unformat_pg_ip4_header;
947 ethernet_arp_header_t h;
949 clib_memset (&h, 0, sizeof (h));
951 /* Set target ethernet address to all zeros. */
952 clib_memset (h.ip4_over_ethernet[1].ethernet, 0,
953 sizeof (h.ip4_over_ethernet[1].ethernet));
955 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
956 #define _8(f,v) h.f = v;
957 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
958 _16 (l3_type, ETHERNET_TYPE_IP4);
959 _8 (n_l2_address_bytes, 6);
960 _8 (n_l3_address_bytes, 4);
961 _16 (opcode, ETHERNET_ARP_OPCODE_request);
965 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
968 /* alloc chunk size */ 8,
975 VLIB_INIT_FUNCTION (ip4_lookup_init);
979 /* Adjacency taken. */
984 /* Packet data, possibly *after* rewrite. */
985 u8 packet_data[64 - 1 * sizeof (u32)];
987 ip4_forward_next_trace_t;
989 #ifndef CLIB_MARCH_VARIANT
991 format_ip4_forward_next_trace (u8 * s, va_list * args)
993 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
994 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
995 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
996 u32 indent = format_get_indent (s);
997 s = format (s, "%U%U",
998 format_white_space, indent,
999 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1005 format_ip4_lookup_trace (u8 * s, va_list * args)
1007 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1008 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1009 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1010 u32 indent = format_get_indent (s);
1012 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1013 t->fib_index, t->dpo_index, t->flow_hash);
1014 s = format (s, "\n%U%U",
1015 format_white_space, indent,
1016 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1021 format_ip4_rewrite_trace (u8 * s, va_list * args)
1023 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1024 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1025 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1026 u32 indent = format_get_indent (s);
1028 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1029 t->fib_index, t->dpo_index, format_ip_adjacency,
1030 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1031 s = format (s, "\n%U%U",
1032 format_white_space, indent,
1033 format_ip_adjacency_packet_data,
1034 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1038 #ifndef CLIB_MARCH_VARIANT
1039 /* Common trace function for all ip4-forward next nodes. */
1041 ip4_forward_next_trace (vlib_main_t * vm,
1042 vlib_node_runtime_t * node,
1043 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1046 ip4_main_t *im = &ip4_main;
1048 n_left = frame->n_vectors;
1049 from = vlib_frame_vector_args (frame);
1054 vlib_buffer_t *b0, *b1;
1055 ip4_forward_next_trace_t *t0, *t1;
1057 /* Prefetch next iteration. */
1058 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1059 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1064 b0 = vlib_get_buffer (vm, bi0);
1065 b1 = vlib_get_buffer (vm, bi1);
1067 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1069 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1070 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1071 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1073 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1074 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1075 vec_elt (im->fib_index_by_sw_if_index,
1076 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1078 clib_memcpy_fast (t0->packet_data,
1079 vlib_buffer_get_current (b0),
1080 sizeof (t0->packet_data));
1082 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1084 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1085 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1086 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1088 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1089 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1090 vec_elt (im->fib_index_by_sw_if_index,
1091 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1092 clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1093 sizeof (t1->packet_data));
1103 ip4_forward_next_trace_t *t0;
1107 b0 = vlib_get_buffer (vm, bi0);
1109 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1111 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1112 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1113 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1115 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1116 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1117 vec_elt (im->fib_index_by_sw_if_index,
1118 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1119 clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1120 sizeof (t0->packet_data));
1127 /* Compute TCP/UDP/ICMP4 checksum in software. */
1129 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1133 u32 ip_header_length, payload_length_host_byte_order;
1134 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1136 void *data_this_buffer;
1138 /* Initialize checksum with ip header. */
1139 ip_header_length = ip4_header_bytes (ip0);
1140 payload_length_host_byte_order =
1141 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1143 clib_host_to_net_u32 (payload_length_host_byte_order +
1144 (ip0->protocol << 16));
1146 if (BITS (uword) == 32)
1149 ip_csum_with_carry (sum0,
1150 clib_mem_unaligned (&ip0->src_address, u32));
1152 ip_csum_with_carry (sum0,
1153 clib_mem_unaligned (&ip0->dst_address, u32));
1157 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1159 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1160 data_this_buffer = (void *) ip0 + ip_header_length;
1161 n_ip_bytes_this_buffer =
1162 p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1163 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1165 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1166 n_ip_bytes_this_buffer - ip_header_length : 0;
1170 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1171 n_bytes_left -= n_this_buffer;
1172 if (n_bytes_left == 0)
1175 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1176 p0 = vlib_get_buffer (vm, p0->next_buffer);
1177 data_this_buffer = vlib_buffer_get_current (p0);
1178 n_this_buffer = p0->current_length;
1181 sum16 = ~ip_csum_fold (sum0);
1187 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1189 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1193 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1194 || ip0->protocol == IP_PROTOCOL_UDP);
1196 udp0 = (void *) (ip0 + 1);
1197 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1199 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1200 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1204 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1206 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1207 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1214 VNET_FEATURE_ARC_INIT (ip4_local) =
1216 .arc_name = "ip4-local",
1217 .start_nodes = VNET_FEATURES ("ip4-local"),
1218 .last_in_arc = "ip4-local-end-of-arc",
1223 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1224 ip4_header_t * ip, u8 is_udp, u8 * error,
1228 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1229 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1233 u32 ip_len, udp_len;
1235 udp = ip4_next_header (ip);
1236 /* Verify UDP length. */
1237 ip_len = clib_net_to_host_u16 (ip->length);
1238 udp_len = clib_net_to_host_u16 (udp->length);
1240 len_diff = ip_len - udp_len;
1241 *good_tcp_udp &= len_diff >= 0;
1242 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1246 #define ip4_local_csum_is_offloaded(_b) \
1247 _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \
1248 || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1250 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1251 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1252 || ip4_local_csum_is_offloaded (_b)))
1254 #define ip4_local_csum_is_valid(_b) \
1255 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1256 || (ip4_local_csum_is_offloaded (_b))) != 0
1259 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1260 ip4_header_t * ih, u8 * error)
1262 u8 is_udp, is_tcp_udp, good_tcp_udp;
1264 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1265 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1267 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1268 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1270 good_tcp_udp = ip4_local_csum_is_valid (b);
1272 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1273 *error = (is_tcp_udp && !good_tcp_udp
1274 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1278 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1279 ip4_header_t ** ih, u8 * error)
1281 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1283 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1284 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1286 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1287 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1289 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1290 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1292 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1293 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1296 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1299 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1303 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1304 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1305 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1306 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1310 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1311 vlib_buffer_t * b, u16 * next, u8 error,
1312 u8 head_of_feature_arc)
1314 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1317 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1318 b->error = error ? error_node->errors[error] : 0;
1319 if (head_of_feature_arc)
1322 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1324 vnet_feature_arc_start (arc_index,
1325 vnet_buffer (b)->sw_if_index[VLIB_RX],
1338 } ip4_local_last_check_t;
1341 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1342 ip4_local_last_check_t * last_check, u8 * error0)
1344 ip4_fib_mtrie_leaf_t leaf0;
1345 ip4_fib_mtrie_t *mtrie0;
1346 const dpo_id_t *dpo0;
1347 load_balance_t *lb0;
1350 vnet_buffer (b)->ip.fib_index =
1351 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1352 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1354 if (PREDICT_FALSE (last_check->first ||
1355 (last_check->src.as_u32 != ip0->src_address.as_u32)))
1357 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1358 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1359 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1360 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1361 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1363 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1364 vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0;
1366 lb0 = load_balance_get (lbi0);
1367 dpo0 = load_balance_get_bucket_i (lb0, 0);
1370 * Must have a route to source otherwise we drop the packet.
1371 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1374 * - the source is a recieve => it's from us => bogus, do this
1375 * first since it sets a different error code.
1376 * - uRPF check for any route to source - accept if passes.
1377 * - allow packets destined to the broadcast address from unknown sources
1380 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1381 && dpo0->dpoi_type == DPO_RECEIVE) ?
1382 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1383 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1384 && !fib_urpf_check_size (lb0->lb_urpf)
1385 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1386 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1388 last_check->src.as_u32 = ip0->src_address.as_u32;
1389 last_check->lbi = lbi0;
1390 last_check->error = *error0;
1394 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1395 vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi;
1396 *error0 = last_check->error;
1397 last_check->first = 0;
1402 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1403 ip4_local_last_check_t * last_check, u8 * error)
1405 ip4_fib_mtrie_leaf_t leaf[2];
1406 ip4_fib_mtrie_t *mtrie[2];
1407 const dpo_id_t *dpo[2];
1408 load_balance_t *lb[2];
1412 not_last_hit = last_check->first;
1413 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1414 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1416 vnet_buffer (b[0])->ip.fib_index =
1417 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1418 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1419 vnet_buffer (b[0])->ip.fib_index;
1421 vnet_buffer (b[1])->ip.fib_index =
1422 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1423 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1424 vnet_buffer (b[1])->ip.fib_index;
1426 if (PREDICT_FALSE (not_last_hit))
1428 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1429 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1431 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1432 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1434 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1435 &ip[0]->src_address, 2);
1436 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1437 &ip[1]->src_address, 2);
1439 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1440 &ip[0]->src_address, 3);
1441 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1442 &ip[1]->src_address, 3);
1444 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1445 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1447 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1448 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0];
1450 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1451 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1];
1453 lb[0] = load_balance_get (lbi[0]);
1454 lb[1] = load_balance_get (lbi[1]);
1456 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1457 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1459 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1460 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1461 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1462 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1463 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1464 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1465 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1467 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1468 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1469 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1470 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1471 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1472 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1473 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1475 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1476 last_check->lbi = lbi[1];
1477 last_check->error = error[1];
1481 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1482 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi;
1484 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1485 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi;
1487 error[0] = last_check->error;
1488 error[1] = last_check->error;
1489 last_check->first = 0;
1493 enum ip_local_packet_type_e
1495 IP_LOCAL_PACKET_TYPE_L4,
1496 IP_LOCAL_PACKET_TYPE_NAT,
1497 IP_LOCAL_PACKET_TYPE_FRAG,
1501 * Determine packet type and next node.
1503 * The expectation is that all packets that are not L4 will skip
1504 * checksums and source checks.
1507 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1509 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1511 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1513 *next = IP_LOCAL_NEXT_REASSEMBLY;
1514 return IP_LOCAL_PACKET_TYPE_FRAG;
1516 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1518 *next = lm->local_next_by_ip_protocol[ip->protocol];
1519 return IP_LOCAL_PACKET_TYPE_NAT;
1522 *next = lm->local_next_by_ip_protocol[ip->protocol];
1523 return IP_LOCAL_PACKET_TYPE_L4;
1527 ip4_local_inline (vlib_main_t * vm,
1528 vlib_node_runtime_t * node,
1529 vlib_frame_t * frame, int head_of_feature_arc)
1531 u32 *from, n_left_from;
1532 vlib_node_runtime_t *error_node =
1533 vlib_node_get_runtime (vm, ip4_input_node.index);
1534 u16 nexts[VLIB_FRAME_SIZE], *next;
1535 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1536 ip4_header_t *ip[2];
1539 ip4_local_last_check_t last_check = {
1541 * 0.0.0.0 can appear as the source address of an IP packet,
1542 * as can any other address, hence the need to use the 'first'
1543 * member to make sure the .lbi is initialised for the first
1546 .src = {.as_u32 = 0},
1548 .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1552 from = vlib_frame_vector_args (frame);
1553 n_left_from = frame->n_vectors;
1555 if (node->flags & VLIB_NODE_FLAG_TRACE)
1556 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1558 vlib_get_buffers (vm, from, bufs, n_left_from);
1562 while (n_left_from >= 6)
1566 /* Prefetch next iteration. */
1568 vlib_prefetch_buffer_header (b[4], LOAD);
1569 vlib_prefetch_buffer_header (b[5], LOAD);
1571 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1572 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1575 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1577 ip[0] = vlib_buffer_get_current (b[0]);
1578 ip[1] = vlib_buffer_get_current (b[1]);
1580 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1581 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1583 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1584 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1586 not_batch = pt[0] ^ pt[1];
1588 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1591 if (PREDICT_TRUE (not_batch == 0))
1593 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1594 ip4_local_check_src_x2 (b, ip, &last_check, error);
1600 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1601 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1605 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1606 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1612 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1613 head_of_feature_arc);
1614 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1615 head_of_feature_arc);
1622 while (n_left_from > 0)
1624 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1626 ip[0] = vlib_buffer_get_current (b[0]);
1627 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1628 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1630 if (head_of_feature_arc == 0 || pt[0])
1633 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1634 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1638 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1639 head_of_feature_arc);
1646 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1647 return frame->n_vectors;
1650 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1651 vlib_frame_t * frame)
1653 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1657 VLIB_REGISTER_NODE (ip4_local_node) =
1659 .name = "ip4-local",
1660 .vector_size = sizeof (u32),
1661 .format_trace = format_ip4_forward_next_trace,
1662 .n_next_nodes = IP_LOCAL_N_NEXT,
1665 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1666 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1667 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1668 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1669 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly",
1675 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1676 vlib_node_runtime_t * node,
1677 vlib_frame_t * frame)
1679 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1683 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1684 .name = "ip4-local-end-of-arc",
1685 .vector_size = sizeof (u32),
1687 .format_trace = format_ip4_forward_next_trace,
1688 .sibling_of = "ip4-local",
1691 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1692 .arc_name = "ip4-local",
1693 .node_name = "ip4-local-end-of-arc",
1694 .runs_before = 0, /* not before any other features */
1698 #ifndef CLIB_MARCH_VARIANT
1700 ip4_register_protocol (u32 protocol, u32 node_index)
1702 vlib_main_t *vm = vlib_get_main ();
1703 ip4_main_t *im = &ip4_main;
1704 ip_lookup_main_t *lm = &im->lookup_main;
1706 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1707 lm->local_next_by_ip_protocol[protocol] =
1708 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1712 static clib_error_t *
1713 show_ip_local_command_fn (vlib_main_t * vm,
1714 unformat_input_t * input, vlib_cli_command_t * cmd)
1716 ip4_main_t *im = &ip4_main;
1717 ip_lookup_main_t *lm = &im->lookup_main;
1720 vlib_cli_output (vm, "Protocols handled by ip4_local");
1721 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1723 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1725 u32 node_index = vlib_get_node (vm,
1726 ip4_local_node.index)->
1727 next_nodes[lm->local_next_by_ip_protocol[i]];
1728 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1738 * Display the set of protocols handled by the local IPv4 stack.
1741 * Example of how to display local protocol table:
1742 * @cliexstart{show ip local}
1743 * Protocols handled by ip4_local
1750 VLIB_CLI_COMMAND (show_ip_local, static) =
1752 .path = "show ip local",
1753 .function = show_ip_local_command_fn,
1754 .short_help = "show ip local",
1759 ip4_arp_inline (vlib_main_t * vm,
1760 vlib_node_runtime_t * node,
1761 vlib_frame_t * frame, int is_glean)
1763 vnet_main_t *vnm = vnet_get_main ();
1764 ip4_main_t *im = &ip4_main;
1765 ip_lookup_main_t *lm = &im->lookup_main;
1766 u32 *from, *to_next_drop;
1767 uword n_left_from, n_left_to_next_drop, next_index;
1768 u32 thread_index = vm->thread_index;
1771 if (node->flags & VLIB_NODE_FLAG_TRACE)
1772 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1774 seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
1776 from = vlib_frame_vector_args (frame);
1777 n_left_from = frame->n_vectors;
1778 next_index = node->cached_next_index;
1779 if (next_index == IP4_ARP_NEXT_DROP)
1780 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1782 while (n_left_from > 0)
1784 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1785 to_next_drop, n_left_to_next_drop);
1787 while (n_left_from > 0 && n_left_to_next_drop > 0)
1789 u32 pi0, bi0, adj_index0, sw_if_index0;
1790 ip_adjacency_t *adj0;
1791 vlib_buffer_t *p0, *b0;
1792 ip4_address_t resolve0;
1793 ethernet_arp_header_t *h0;
1794 vnet_hw_interface_t *hw_if0;
1798 p0 = vlib_get_buffer (vm, pi0);
1802 to_next_drop[0] = pi0;
1804 n_left_to_next_drop -= 1;
1806 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1807 adj0 = adj_get (adj_index0);
1811 /* resolve the packet's destination */
1812 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1813 resolve0 = ip0->dst_address;
1817 /* resolve the incomplete adj */
1818 resolve0 = adj0->sub_type.nbr.next_hop.ip4;
1821 /* combine the address and interface for the hash key */
1822 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1823 r0 = (u64) resolve0.data_u32 << 32;
1826 if (throttle_check (&im->arp_throttle, thread_index, r0, seed))
1828 p0->error = node->errors[IP4_ARP_ERROR_THROTTLED];
1833 * the adj has been updated to a rewrite but the node the DPO that got
1834 * us here hasn't - yet. no big deal. we'll drop while we wait.
1836 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1838 p0->error = node->errors[IP4_ARP_ERROR_RESOLVED];
1843 * Can happen if the control-plane is programming tables
1844 * with traffic flowing; at least that's today's lame excuse.
1846 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1847 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1849 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1852 /* Send ARP request. */
1854 vlib_packet_template_get_packet (vm,
1855 &im->ip4_arp_request_packet_template,
1858 /* Seems we're out of buffers */
1859 if (PREDICT_FALSE (!h0))
1861 p0->error = node->errors[IP4_ARP_ERROR_NO_BUFFERS];
1865 /* Add rewrite/encap string for ARP packet. */
1866 vnet_rewrite_one_header (adj0[0], h0, sizeof (ethernet_header_t));
1868 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1870 /* Src ethernet address in ARP header. */
1871 clib_memcpy_fast (h0->ip4_over_ethernet[0].ethernet,
1873 sizeof (h0->ip4_over_ethernet[0].ethernet));
1876 /* The interface's source address is stashed in the Glean Adj */
1877 h0->ip4_over_ethernet[0].ip4 =
1878 adj0->sub_type.glean.receive_addr.ip4;
1882 /* Src IP address in ARP header. */
1883 if (ip4_src_address_for_packet (lm, sw_if_index0,
1884 &h0->ip4_over_ethernet[0].ip4))
1886 /* No source address available */
1887 p0->error = node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1888 vlib_buffer_free (vm, &bi0, 1);
1892 h0->ip4_over_ethernet[1].ip4 = resolve0;
1894 p0->error = node->errors[IP4_ARP_ERROR_REQUEST_SENT];
1896 vlib_buffer_copy_trace_flag (vm, p0, bi0);
1897 b0 = vlib_get_buffer (vm, bi0);
1898 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1899 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1901 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1903 vlib_set_next_frame_buffer (vm, node,
1904 adj0->rewrite_header.next_index, bi0);
1907 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1910 return frame->n_vectors;
1913 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1914 vlib_frame_t * frame)
1916 return (ip4_arp_inline (vm, node, frame, 0));
1919 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1920 vlib_frame_t * frame)
1922 return (ip4_arp_inline (vm, node, frame, 1));
1925 static char *ip4_arp_error_strings[] = {
1926 [IP4_ARP_ERROR_THROTTLED] = "ARP requests throttled",
1927 [IP4_ARP_ERROR_RESOLVED] = "ARP requests resolved",
1928 [IP4_ARP_ERROR_NO_BUFFERS] = "ARP requests out of buffer",
1929 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1930 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1931 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1935 VLIB_REGISTER_NODE (ip4_arp_node) =
1938 .vector_size = sizeof (u32),
1939 .format_trace = format_ip4_forward_next_trace,
1940 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1941 .error_strings = ip4_arp_error_strings,
1942 .n_next_nodes = IP4_ARP_N_NEXT,
1945 [IP4_ARP_NEXT_DROP] = "error-drop",
1949 VLIB_REGISTER_NODE (ip4_glean_node) =
1951 .name = "ip4-glean",
1952 .vector_size = sizeof (u32),
1953 .format_trace = format_ip4_forward_next_trace,
1954 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1955 .error_strings = ip4_arp_error_strings,
1956 .n_next_nodes = IP4_ARP_N_NEXT,
1958 [IP4_ARP_NEXT_DROP] = "error-drop",
1963 #define foreach_notrace_ip4_arp_error \
1969 _(NO_SOURCE_ADDRESS)
1971 static clib_error_t *
1972 arp_notrace_init (vlib_main_t * vm)
1974 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1976 /* don't trace ARP request packets */
1978 vnet_pcap_drop_trace_filter_add_del \
1979 (rt->errors[IP4_ARP_ERROR_##a], \
1981 foreach_notrace_ip4_arp_error;
1986 VLIB_INIT_FUNCTION (arp_notrace_init);
1989 #ifndef CLIB_MARCH_VARIANT
1990 /* Send an ARP request to see if given destination is reachable on given interface. */
1992 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1995 vnet_main_t *vnm = vnet_get_main ();
1996 ip4_main_t *im = &ip4_main;
1997 ethernet_arp_header_t *h;
1999 ip_interface_address_t *ia;
2000 ip_adjacency_t *adj;
2001 vnet_hw_interface_t *hi;
2002 vnet_sw_interface_t *si;
2006 u8 unicast_rewrite = 0;
2008 si = vnet_get_sw_interface (vnm, sw_if_index);
2010 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2012 return clib_error_return (0, "%U: interface %U down",
2013 format_ip4_address, dst,
2014 format_vnet_sw_if_index_name, vnm,
2019 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2022 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2023 return clib_error_return
2025 "no matching interface address for destination %U (interface %U)",
2026 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2030 h = vlib_packet_template_get_packet (vm,
2031 &im->ip4_arp_request_packet_template,
2035 return clib_error_return (0, "ARP request packet allocation failed");
2037 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2038 if (PREDICT_FALSE (!hi->hw_address))
2040 return clib_error_return (0, "%U: interface %U do not support ip probe",
2041 format_ip4_address, dst,
2042 format_vnet_sw_if_index_name, vnm,
2046 clib_memcpy_fast (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2047 sizeof (h->ip4_over_ethernet[0].ethernet));
2049 h->ip4_over_ethernet[0].ip4 = src[0];
2050 h->ip4_over_ethernet[1].ip4 = dst[0];
2052 b = vlib_get_buffer (vm, bi);
2053 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2054 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2056 ip46_address_t nh = {
2060 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2061 VNET_LINK_IP4, &nh, sw_if_index);
2064 /* Peer has been previously resolved, retrieve glean adj instead */
2065 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2068 unicast_rewrite = 1;
2072 ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
2073 VNET_LINK_IP4, sw_if_index, &nh);
2078 /* Add encapsulation string for software interface (e.g. ethernet header). */
2079 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2080 if (unicast_rewrite)
2082 u16 *etype = vlib_buffer_get_current (b) - 2;
2083 etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2085 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2088 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2089 u32 *to_next = vlib_frame_vector_args (f);
2092 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2096 return /* no error */ 0;
2102 IP4_REWRITE_NEXT_DROP,
2103 IP4_REWRITE_NEXT_ICMP_ERROR,
2104 IP4_REWRITE_NEXT_FRAGMENT,
2105 IP4_REWRITE_N_NEXT /* Last */
2106 } ip4_rewrite_next_t;
2109 * This bits of an IPv4 address to mask to construct a multicast
2112 #if CLIB_ARCH_IS_BIG_ENDIAN
2113 #define IP4_MCAST_ADDR_MASK 0x007fffff
2115 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2119 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2120 u16 adj_packet_bytes, bool df, u16 * next, u32 * error)
2122 if (packet_len > adj_packet_bytes)
2124 *error = IP4_ERROR_MTU_EXCEEDED;
2127 icmp4_error_set_vnet_buffer
2128 (b, ICMP4_destination_unreachable,
2129 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2131 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2135 /* IP fragmentation */
2136 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2137 IP4_FRAG_NEXT_IP4_REWRITE, 0);
2138 *next = IP4_REWRITE_NEXT_FRAGMENT;
2143 /* Decrement TTL & update checksum.
2144 Works either endian, so no need for byte swap. */
2145 static_always_inline void
2146 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2151 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2153 b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2159 /* Input node should have reject packets with ttl 0. */
2160 ASSERT (ip->ttl > 0);
2162 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2163 checksum += checksum >= 0xffff;
2165 ip->checksum = checksum;
2170 * If the ttl drops below 1 when forwarding, generate
2173 if (PREDICT_FALSE (ttl <= 0))
2175 *error = IP4_ERROR_TIME_EXPIRED;
2176 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2177 icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2178 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2180 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2183 /* Verify checksum. */
2184 ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2185 (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2190 ip4_rewrite_inline (vlib_main_t * vm,
2191 vlib_node_runtime_t * node,
2192 vlib_frame_t * frame,
2193 int do_counters, int is_midchain, int is_mcast)
2195 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2196 u32 *from = vlib_frame_vector_args (frame);
2197 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2198 u16 nexts[VLIB_FRAME_SIZE], *next;
2200 vlib_node_runtime_t *error_node =
2201 vlib_node_get_runtime (vm, ip4_input_node.index);
2203 n_left_from = frame->n_vectors;
2204 u32 thread_index = vm->thread_index;
2206 vlib_get_buffers (vm, from, bufs, n_left_from);
2207 clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2209 if (n_left_from >= 6)
2212 for (i = 2; i < 6; i++)
2213 vlib_prefetch_buffer_header (bufs[i], LOAD);
2218 while (n_left_from >= 8)
2220 ip_adjacency_t *adj0, *adj1;
2221 ip4_header_t *ip0, *ip1;
2222 u32 rw_len0, error0, adj_index0;
2223 u32 rw_len1, error1, adj_index1;
2224 u32 tx_sw_if_index0, tx_sw_if_index1;
2227 vlib_prefetch_buffer_header (b[6], LOAD);
2228 vlib_prefetch_buffer_header (b[7], LOAD);
2230 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2231 adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2234 * pre-fetch the per-adjacency counters
2238 vlib_prefetch_combined_counter (&adjacency_counters,
2239 thread_index, adj_index0);
2240 vlib_prefetch_combined_counter (&adjacency_counters,
2241 thread_index, adj_index1);
2244 ip0 = vlib_buffer_get_current (b[0]);
2245 ip1 = vlib_buffer_get_current (b[1]);
2247 error0 = error1 = IP4_ERROR_NONE;
2249 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2250 ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2252 /* Rewrite packet header and updates lengths. */
2253 adj0 = adj_get (adj_index0);
2254 adj1 = adj_get (adj_index1);
2256 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2257 rw_len0 = adj0[0].rewrite_header.data_bytes;
2258 rw_len1 = adj1[0].rewrite_header.data_bytes;
2259 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2260 vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2262 p = vlib_buffer_get_current (b[2]);
2263 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2264 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2266 p = vlib_buffer_get_current (b[3]);
2267 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2268 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2270 /* Check MTU of outgoing interface. */
2271 ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2272 adj0[0].rewrite_header.max_l3_packet_bytes,
2273 ip0->flags_and_fragment_offset &
2274 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2276 ip4_mtu_check (b[1], clib_net_to_host_u16 (ip1->length),
2277 adj1[0].rewrite_header.max_l3_packet_bytes,
2278 ip1->flags_and_fragment_offset &
2279 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2284 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2285 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2286 IP4_ERROR_SAME_INTERFACE : error0);
2287 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2288 vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2289 IP4_ERROR_SAME_INTERFACE : error1);
2292 b[0]->error = error_node->errors[error0];
2293 b[1]->error = error_node->errors[error1];
2294 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2295 * to see the IP headerr */
2296 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2298 u32 next_index = adj0[0].rewrite_header.next_index;
2299 b[0]->current_data -= rw_len0;
2300 b[0]->current_length += rw_len0;
2301 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2302 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2305 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2306 vnet_feature_arc_start (lm->output_feature_arc_index,
2307 tx_sw_if_index0, &next_index, b[0]);
2308 next[0] = next_index;
2310 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2312 u32 next_index = adj1[0].rewrite_header.next_index;
2313 b[1]->current_data -= rw_len1;
2314 b[1]->current_length += rw_len1;
2316 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2317 vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2320 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2321 vnet_feature_arc_start (lm->output_feature_arc_index,
2322 tx_sw_if_index1, &next_index, b[1]);
2323 next[1] = next_index;
2326 /* Guess we are only writing on simple Ethernet header. */
2327 vnet_rewrite_two_headers (adj0[0], adj1[0],
2328 ip0, ip1, sizeof (ethernet_header_t));
2331 * Bump the per-adjacency counters
2335 vlib_increment_combined_counter
2336 (&adjacency_counters,
2338 adj_index0, 1, vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2340 vlib_increment_combined_counter
2341 (&adjacency_counters,
2343 adj_index1, 1, vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2348 adj0->sub_type.midchain.fixup_func
2349 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2350 adj1->sub_type.midchain.fixup_func
2351 (vm, adj1, b[1], adj1->sub_type.midchain.fixup_data);
2357 * copy bytes from the IP address into the MAC rewrite
2359 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2360 adj0->rewrite_header.dst_mcast_offset,
2361 &ip0->dst_address.as_u32, (u8 *) ip0);
2362 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2363 adj1->rewrite_header.dst_mcast_offset,
2364 &ip1->dst_address.as_u32, (u8 *) ip1);
2372 while (n_left_from > 0)
2374 ip_adjacency_t *adj0;
2376 u32 rw_len0, adj_index0, error0;
2377 u32 tx_sw_if_index0;
2379 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2381 adj0 = adj_get (adj_index0);
2384 vlib_prefetch_combined_counter (&adjacency_counters,
2385 thread_index, adj_index0);
2387 ip0 = vlib_buffer_get_current (b[0]);
2389 error0 = IP4_ERROR_NONE;
2391 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2394 /* Update packet buffer attributes/set output interface. */
2395 rw_len0 = adj0[0].rewrite_header.data_bytes;
2396 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2398 /* Check MTU of outgoing interface. */
2399 ip4_mtu_check (b[0], clib_net_to_host_u16 (ip0->length),
2400 adj0[0].rewrite_header.max_l3_packet_bytes,
2401 ip0->flags_and_fragment_offset &
2402 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2407 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2408 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2409 IP4_ERROR_SAME_INTERFACE : error0);
2411 b[0]->error = error_node->errors[error0];
2413 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2414 * to see the IP headerr */
2415 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2417 u32 next_index = adj0[0].rewrite_header.next_index;
2418 b[0]->current_data -= rw_len0;
2419 b[0]->current_length += rw_len0;
2420 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2421 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2424 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2425 vnet_feature_arc_start (lm->output_feature_arc_index,
2426 tx_sw_if_index0, &next_index, b[0]);
2427 next[0] = next_index;
2430 /* Guess we are only writing on simple Ethernet header. */
2431 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2434 vlib_increment_combined_counter
2435 (&adjacency_counters,
2436 thread_index, adj_index0, 1,
2437 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2441 adj0->sub_type.midchain.fixup_func
2442 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2448 * copy bytes from the IP address into the MAC rewrite
2450 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2451 adj0->rewrite_header.dst_mcast_offset,
2452 &ip0->dst_address.as_u32, (u8 *) ip0);
2461 /* Need to do trace after rewrites to pick up new packet data. */
2462 if (node->flags & VLIB_NODE_FLAG_TRACE)
2463 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2465 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2466 return frame->n_vectors;
2470 /** @brief IPv4 rewrite node.
2473 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2474 header checksum, fetch the ip adjacency, check the outbound mtu,
2475 apply the adjacency rewrite, and send pkts to the adjacency
2476 rewrite header's rewrite_next_index.
2478 @param vm vlib_main_t corresponding to the current thread
2479 @param node vlib_node_runtime_t
2480 @param frame vlib_frame_t whose contents should be dispatched
2482 @par Graph mechanics: buffer metadata, next index usage
2485 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2486 - the rewrite adjacency index
2487 - <code>adj->lookup_next_index</code>
2488 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2489 the packet will be dropped.
2490 - <code>adj->rewrite_header</code>
2491 - Rewrite string length, rewrite string, next_index
2494 - <code>b->current_data, b->current_length</code>
2495 - Updated net of applying the rewrite string
2497 <em>Next Indices:</em>
2498 - <code> adj->rewrite_header.next_index </code>
2502 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2503 vlib_frame_t * frame)
2505 if (adj_are_counters_enabled ())
2506 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2508 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2511 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2512 vlib_node_runtime_t * node,
2513 vlib_frame_t * frame)
2515 if (adj_are_counters_enabled ())
2516 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2518 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2521 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2522 vlib_node_runtime_t * node,
2523 vlib_frame_t * frame)
2525 if (adj_are_counters_enabled ())
2526 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2528 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2531 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2532 vlib_node_runtime_t * node,
2533 vlib_frame_t * frame)
2535 if (adj_are_counters_enabled ())
2536 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2538 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2541 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2542 vlib_node_runtime_t * node,
2543 vlib_frame_t * frame)
2545 if (adj_are_counters_enabled ())
2546 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2548 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2552 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2553 .name = "ip4-rewrite",
2554 .vector_size = sizeof (u32),
2556 .format_trace = format_ip4_rewrite_trace,
2558 .n_next_nodes = IP4_REWRITE_N_NEXT,
2560 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2561 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2562 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2566 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2567 .name = "ip4-rewrite-bcast",
2568 .vector_size = sizeof (u32),
2570 .format_trace = format_ip4_rewrite_trace,
2571 .sibling_of = "ip4-rewrite",
2574 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2575 .name = "ip4-rewrite-mcast",
2576 .vector_size = sizeof (u32),
2578 .format_trace = format_ip4_rewrite_trace,
2579 .sibling_of = "ip4-rewrite",
2582 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2583 .name = "ip4-mcast-midchain",
2584 .vector_size = sizeof (u32),
2586 .format_trace = format_ip4_rewrite_trace,
2587 .sibling_of = "ip4-rewrite",
2590 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2591 .name = "ip4-midchain",
2592 .vector_size = sizeof (u32),
2593 .format_trace = format_ip4_forward_next_trace,
2594 .sibling_of = "ip4-rewrite",
2599 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2601 ip4_fib_mtrie_t *mtrie0;
2602 ip4_fib_mtrie_leaf_t leaf0;
2605 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2607 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2608 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2609 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2611 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2613 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2616 static clib_error_t *
2617 test_lookup_command_fn (vlib_main_t * vm,
2618 unformat_input_t * input, vlib_cli_command_t * cmd)
2625 ip4_address_t ip4_base_address;
2628 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2630 if (unformat (input, "table %d", &table_id))
2632 /* Make sure the entry exists. */
2633 fib = ip4_fib_get (table_id);
2634 if ((fib) && (fib->index != table_id))
2635 return clib_error_return (0, "<fib-index> %d does not exist",
2638 else if (unformat (input, "count %f", &count))
2641 else if (unformat (input, "%U",
2642 unformat_ip4_address, &ip4_base_address))
2645 return clib_error_return (0, "unknown input `%U'",
2646 format_unformat_error, input);
2651 for (i = 0; i < n; i++)
2653 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2656 ip4_base_address.as_u32 =
2657 clib_host_to_net_u32 (1 +
2658 clib_net_to_host_u32 (ip4_base_address.as_u32));
2662 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2664 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2670 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2671 * given FIB table to determine if there is a conflict with the
2672 * adjacency table. The fib-id can be determined by using the
2673 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2676 * @todo This command uses fib-id, other commands use table-id (not
2677 * just a name, they are different indexes). Would like to change this
2678 * to table-id for consistency.
2681 * Example of how to run the test lookup command:
2682 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2683 * No errors in 2 lookups
2687 VLIB_CLI_COMMAND (lookup_test_command, static) =
2689 .path = "test lookup",
2690 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2691 .function = test_lookup_command_fn,
2695 #ifndef CLIB_MARCH_VARIANT
2697 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2701 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2703 if (~0 == fib_index)
2704 return VNET_API_ERROR_NO_SUCH_FIB;
2706 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2713 static clib_error_t *
2714 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2715 unformat_input_t * input,
2716 vlib_cli_command_t * cmd)
2720 u32 flow_hash_config = 0;
2723 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2725 if (unformat (input, "table %d", &table_id))
2728 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2729 foreach_flow_hash_bit
2736 return clib_error_return (0, "unknown input `%U'",
2737 format_unformat_error, input);
2739 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2745 case VNET_API_ERROR_NO_SUCH_FIB:
2746 return clib_error_return (0, "no such FIB table %d", table_id);
2749 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2757 * Configure the set of IPv4 fields used by the flow hash.
2760 * Example of how to set the flow hash on a given table:
2761 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2762 * Example of display the configured flow hash:
2763 * @cliexstart{show ip fib}
2764 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2767 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2768 * [0] [@0]: dpo-drop ip6
2771 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2772 * [0] [@0]: dpo-drop ip6
2775 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2776 * [0] [@0]: dpo-drop ip6
2779 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2780 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2783 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2784 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2785 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2786 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2787 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2790 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2791 * [0] [@0]: dpo-drop ip6
2792 * 255.255.255.255/32
2794 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2795 * [0] [@0]: dpo-drop ip6
2796 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2799 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2800 * [0] [@0]: dpo-drop ip6
2803 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2804 * [0] [@0]: dpo-drop ip6
2807 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2808 * [0] [@4]: ipv4-glean: af_packet0
2811 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2812 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2815 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2816 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2819 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2820 * [0] [@4]: ipv4-glean: af_packet1
2823 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2824 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2827 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2828 * [0] [@0]: dpo-drop ip6
2831 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2832 * [0] [@0]: dpo-drop ip6
2833 * 255.255.255.255/32
2835 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2836 * [0] [@0]: dpo-drop ip6
2840 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2842 .path = "set ip flow-hash",
2844 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2845 .function = set_ip_flow_hash_command_fn,
2849 #ifndef CLIB_MARCH_VARIANT
2851 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2854 vnet_main_t *vnm = vnet_get_main ();
2855 vnet_interface_main_t *im = &vnm->interface_main;
2856 ip4_main_t *ipm = &ip4_main;
2857 ip_lookup_main_t *lm = &ipm->lookup_main;
2858 vnet_classify_main_t *cm = &vnet_classify_main;
2859 ip4_address_t *if_addr;
2861 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2862 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2864 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2865 return VNET_API_ERROR_NO_SUCH_ENTRY;
2867 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2868 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2870 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2872 if (NULL != if_addr)
2874 fib_prefix_t pfx = {
2876 .fp_proto = FIB_PROTOCOL_IP4,
2877 .fp_addr.ip4 = *if_addr,
2881 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2885 if (table_index != (u32) ~ 0)
2887 dpo_id_t dpo = DPO_INVALID;
2892 classify_dpo_create (DPO_PROTO_IP4, table_index));
2894 fib_table_entry_special_dpo_add (fib_index,
2896 FIB_SOURCE_CLASSIFY,
2897 FIB_ENTRY_FLAG_NONE, &dpo);
2902 fib_table_entry_special_remove (fib_index,
2903 &pfx, FIB_SOURCE_CLASSIFY);
2911 static clib_error_t *
2912 set_ip_classify_command_fn (vlib_main_t * vm,
2913 unformat_input_t * input,
2914 vlib_cli_command_t * cmd)
2916 u32 table_index = ~0;
2917 int table_index_set = 0;
2918 u32 sw_if_index = ~0;
2921 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2923 if (unformat (input, "table-index %d", &table_index))
2924 table_index_set = 1;
2925 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2926 vnet_get_main (), &sw_if_index))
2932 if (table_index_set == 0)
2933 return clib_error_return (0, "classify table-index must be specified");
2935 if (sw_if_index == ~0)
2936 return clib_error_return (0, "interface / subif must be specified");
2938 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2945 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2946 return clib_error_return (0, "No such interface");
2948 case VNET_API_ERROR_NO_SUCH_ENTRY:
2949 return clib_error_return (0, "No such classifier table");
2955 * Assign a classification table to an interface. The classification
2956 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2957 * commands. Once the table is create, use this command to filter packets
2961 * Example of how to assign a classification table to an interface:
2962 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2965 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2967 .path = "set ip classify",
2969 "set ip classify intfc <interface> table-index <classify-idx>",
2970 .function = set_ip_classify_command_fn,
2974 static clib_error_t *
2975 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2977 ip4_main_t *im = &ip4_main;
2980 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2982 if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2985 return clib_error_return (0,
2986 "invalid heap-size parameter `%U'",
2987 format_unformat_error, input);
2990 im->mtrie_heap_size = heapsize;
2995 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2998 * fd.io coding-style-patch-verification: ON
3001 * eval: (c-set-style "gnu")