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 ("ipsec4-input"),
759 VNET_FEATURE_INIT (ip4_ipsec, static) =
761 .arc_name = "ip4-unicast",
762 .node_name = "ipsec4-input",
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 ("ipsec4-output"),
845 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
847 .arc_name = "ip4-output",
848 .node_name = "ipsec4-output",
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 clib_memset (&h, 0, sizeof (h));
948 /* Set target ethernet address to all zeros. */
949 clib_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;
1484 enum ip_local_packet_type_e
1486 IP_LOCAL_PACKET_TYPE_L4,
1487 IP_LOCAL_PACKET_TYPE_NAT,
1488 IP_LOCAL_PACKET_TYPE_FRAG,
1492 * Determine packet type and next node.
1494 * The expectation is that all packets that are not L4 will skip
1495 * checksums and source checks.
1498 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1500 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1502 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1504 *next = IP_LOCAL_NEXT_REASSEMBLY;
1505 return IP_LOCAL_PACKET_TYPE_FRAG;
1507 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1509 *next = lm->local_next_by_ip_protocol[ip->protocol];
1510 return IP_LOCAL_PACKET_TYPE_NAT;
1513 *next = lm->local_next_by_ip_protocol[ip->protocol];
1514 return IP_LOCAL_PACKET_TYPE_L4;
1518 ip4_local_inline (vlib_main_t * vm,
1519 vlib_node_runtime_t * node,
1520 vlib_frame_t * frame, int head_of_feature_arc)
1522 u32 *from, n_left_from;
1523 vlib_node_runtime_t *error_node =
1524 vlib_node_get_runtime (vm, ip4_input_node.index);
1525 u16 nexts[VLIB_FRAME_SIZE], *next;
1526 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1527 ip4_header_t *ip[2];
1530 ip4_local_last_check_t last_check = {
1531 .src = {.as_u32 = 0},
1533 .error = IP4_ERROR_UNKNOWN_PROTOCOL
1536 from = vlib_frame_vector_args (frame);
1537 n_left_from = frame->n_vectors;
1539 if (node->flags & VLIB_NODE_FLAG_TRACE)
1540 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1542 vlib_get_buffers (vm, from, bufs, n_left_from);
1546 while (n_left_from >= 6)
1550 /* Prefetch next iteration. */
1552 vlib_prefetch_buffer_header (b[4], LOAD);
1553 vlib_prefetch_buffer_header (b[5], LOAD);
1555 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1556 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1559 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1561 ip[0] = vlib_buffer_get_current (b[0]);
1562 ip[1] = vlib_buffer_get_current (b[1]);
1564 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1565 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1567 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1568 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1570 not_batch = pt[0] ^ pt[1];
1572 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1575 if (PREDICT_TRUE (not_batch == 0))
1577 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1578 ip4_local_check_src_x2 (b, ip, &last_check, error);
1584 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1585 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1589 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1590 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1596 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1597 head_of_feature_arc);
1598 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1599 head_of_feature_arc);
1606 while (n_left_from > 0)
1608 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1610 ip[0] = vlib_buffer_get_current (b[0]);
1611 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1612 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1614 if (head_of_feature_arc == 0 || pt[0])
1617 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1618 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1622 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1623 head_of_feature_arc);
1630 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1631 return frame->n_vectors;
1634 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1635 vlib_frame_t * frame)
1637 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1641 VLIB_REGISTER_NODE (ip4_local_node) =
1643 .name = "ip4-local",
1644 .vector_size = sizeof (u32),
1645 .format_trace = format_ip4_forward_next_trace,
1646 .n_next_nodes = IP_LOCAL_N_NEXT,
1649 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1650 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1651 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1652 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1653 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly",
1659 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1660 vlib_node_runtime_t * node,
1661 vlib_frame_t * frame)
1663 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1667 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1668 .name = "ip4-local-end-of-arc",
1669 .vector_size = sizeof (u32),
1671 .format_trace = format_ip4_forward_next_trace,
1672 .sibling_of = "ip4-local",
1675 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1676 .arc_name = "ip4-local",
1677 .node_name = "ip4-local-end-of-arc",
1678 .runs_before = 0, /* not before any other features */
1682 #ifndef CLIB_MARCH_VARIANT
1684 ip4_register_protocol (u32 protocol, u32 node_index)
1686 vlib_main_t *vm = vlib_get_main ();
1687 ip4_main_t *im = &ip4_main;
1688 ip_lookup_main_t *lm = &im->lookup_main;
1690 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1691 lm->local_next_by_ip_protocol[protocol] =
1692 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1696 static clib_error_t *
1697 show_ip_local_command_fn (vlib_main_t * vm,
1698 unformat_input_t * input, vlib_cli_command_t * cmd)
1700 ip4_main_t *im = &ip4_main;
1701 ip_lookup_main_t *lm = &im->lookup_main;
1704 vlib_cli_output (vm, "Protocols handled by ip4_local");
1705 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1707 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1709 u32 node_index = vlib_get_node (vm,
1710 ip4_local_node.index)->
1711 next_nodes[lm->local_next_by_ip_protocol[i]];
1712 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1722 * Display the set of protocols handled by the local IPv4 stack.
1725 * Example of how to display local protocol table:
1726 * @cliexstart{show ip local}
1727 * Protocols handled by ip4_local
1734 VLIB_CLI_COMMAND (show_ip_local, static) =
1736 .path = "show ip local",
1737 .function = show_ip_local_command_fn,
1738 .short_help = "show ip local",
1743 ip4_arp_inline (vlib_main_t * vm,
1744 vlib_node_runtime_t * node,
1745 vlib_frame_t * frame, int is_glean)
1747 vnet_main_t *vnm = vnet_get_main ();
1748 ip4_main_t *im = &ip4_main;
1749 ip_lookup_main_t *lm = &im->lookup_main;
1750 u32 *from, *to_next_drop;
1751 uword n_left_from, n_left_to_next_drop, next_index;
1752 u32 thread_index = vm->thread_index;
1755 if (node->flags & VLIB_NODE_FLAG_TRACE)
1756 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1758 seed = throttle_seed (&im->arp_throttle, thread_index, vlib_time_now (vm));
1760 from = vlib_frame_vector_args (frame);
1761 n_left_from = frame->n_vectors;
1762 next_index = node->cached_next_index;
1763 if (next_index == IP4_ARP_NEXT_DROP)
1764 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1766 while (n_left_from > 0)
1768 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1769 to_next_drop, n_left_to_next_drop);
1771 while (n_left_from > 0 && n_left_to_next_drop > 0)
1773 u32 pi0, adj_index0, sw_if_index0, drop0;
1774 ip_adjacency_t *adj0;
1781 p0 = vlib_get_buffer (vm, pi0);
1783 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1784 adj0 = adj_get (adj_index0);
1785 ip0 = vlib_buffer_get_current (p0);
1787 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1788 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1790 if (PREDICT_TRUE (is_glean))
1793 * this is the Glean case, so we are ARPing for the
1794 * packet's destination
1796 r0 = ip0->dst_address.data_u32;
1800 r0 = adj0->sub_type.nbr.next_hop.ip4.data_u32;
1802 /* combine the address and interface for the hash key */
1806 drop0 = throttle_check (&im->arp_throttle, thread_index, r0, seed);
1810 to_next_drop[0] = pi0;
1812 n_left_to_next_drop -= 1;
1815 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
1816 IP4_ARP_ERROR_REQUEST_SENT];
1819 * the adj has been updated to a rewrite but the node the DPO that got
1820 * us here hasn't - yet. no big deal. we'll drop while we wait.
1822 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1829 * Can happen if the control-plane is programming tables
1830 * with traffic flowing; at least that's today's lame excuse.
1832 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1833 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1835 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1838 /* Send ARP request. */
1842 ethernet_arp_header_t *h0;
1843 vnet_hw_interface_t *hw_if0;
1846 vlib_packet_template_get_packet (vm,
1847 &im->ip4_arp_request_packet_template,
1850 /* Seems we're out of buffers */
1851 if (PREDICT_FALSE (!h0))
1854 /* Add rewrite/encap string for ARP packet. */
1855 vnet_rewrite_one_header (adj0[0], h0,
1856 sizeof (ethernet_header_t));
1858 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1860 /* Src ethernet address in ARP header. */
1861 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
1863 sizeof (h0->ip4_over_ethernet[0].ethernet));
1867 /* The interface's source address is stashed in the Glean Adj */
1868 h0->ip4_over_ethernet[0].ip4 =
1869 adj0->sub_type.glean.receive_addr.ip4;
1871 /* Copy in destination address we are requesting. This is the
1872 * glean case, so it's the packet's destination.*/
1873 h0->ip4_over_ethernet[1].ip4.data_u32 =
1874 ip0->dst_address.data_u32;
1878 /* Src IP address in ARP header. */
1879 if (ip4_src_address_for_packet (lm, sw_if_index0,
1881 ip4_over_ethernet[0].ip4))
1883 /* No source address available */
1885 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1886 vlib_buffer_free (vm, &bi0, 1);
1890 /* Copy in destination address we are requesting from the
1892 h0->ip4_over_ethernet[1].ip4.data_u32 =
1893 adj0->sub_type.nbr.next_hop.ip4.as_u32;
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,
1909 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1912 return frame->n_vectors;
1915 VLIB_NODE_FN (ip4_arp_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1916 vlib_frame_t * frame)
1918 return (ip4_arp_inline (vm, node, frame, 0));
1921 VLIB_NODE_FN (ip4_glean_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1922 vlib_frame_t * frame)
1924 return (ip4_arp_inline (vm, node, frame, 1));
1927 static char *ip4_arp_error_strings[] = {
1928 [IP4_ARP_ERROR_DROP] = "address overflow drops",
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_REPLICATE_DROP] = "ARP replication completed",
1932 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
1933 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1937 VLIB_REGISTER_NODE (ip4_arp_node) =
1940 .vector_size = sizeof (u32),
1941 .format_trace = format_ip4_forward_next_trace,
1942 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1943 .error_strings = ip4_arp_error_strings,
1944 .n_next_nodes = IP4_ARP_N_NEXT,
1947 [IP4_ARP_NEXT_DROP] = "error-drop",
1951 VLIB_REGISTER_NODE (ip4_glean_node) =
1953 .name = "ip4-glean",
1954 .vector_size = sizeof (u32),
1955 .format_trace = format_ip4_forward_next_trace,
1956 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1957 .error_strings = ip4_arp_error_strings,
1958 .n_next_nodes = IP4_ARP_N_NEXT,
1960 [IP4_ARP_NEXT_DROP] = "error-drop",
1965 #define foreach_notrace_ip4_arp_error \
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 (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 = 0; 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], adj0->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 adj0->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")