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).
92 ip4_lookup (vlib_main_t * vm,
93 vlib_node_runtime_t * node, vlib_frame_t * frame)
95 return ip4_lookup_inline (vm, node, frame,
96 /* lookup_for_responses_to_locally_received_packets */
101 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
104 VLIB_REGISTER_NODE (ip4_lookup_node) =
106 .function = ip4_lookup,
107 .name = "ip4-lookup",
108 .vector_size = sizeof (u32),
109 .format_trace = format_ip4_lookup_trace,
110 .n_next_nodes = IP_LOOKUP_N_NEXT,
111 .next_nodes = IP4_LOOKUP_NEXT_NODES,
115 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
118 ip4_load_balance (vlib_main_t * vm,
119 vlib_node_runtime_t * node, vlib_frame_t * frame)
121 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
122 u32 n_left_from, n_left_to_next, *from, *to_next;
123 ip_lookup_next_t next;
124 u32 thread_index = vlib_get_thread_index ();
126 from = vlib_frame_vector_args (frame);
127 n_left_from = frame->n_vectors;
128 next = node->cached_next_index;
130 if (node->flags & VLIB_NODE_FLAG_TRACE)
131 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
133 while (n_left_from > 0)
135 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
138 while (n_left_from >= 4 && n_left_to_next >= 2)
140 ip_lookup_next_t next0, next1;
141 const load_balance_t *lb0, *lb1;
142 vlib_buffer_t *p0, *p1;
143 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
144 const ip4_header_t *ip0, *ip1;
145 const dpo_id_t *dpo0, *dpo1;
147 /* Prefetch next iteration. */
149 vlib_buffer_t *p2, *p3;
151 p2 = vlib_get_buffer (vm, from[2]);
152 p3 = vlib_get_buffer (vm, from[3]);
154 vlib_prefetch_buffer_header (p2, STORE);
155 vlib_prefetch_buffer_header (p3, STORE);
157 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
158 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
161 pi0 = to_next[0] = from[0];
162 pi1 = to_next[1] = from[1];
169 p0 = vlib_get_buffer (vm, pi0);
170 p1 = vlib_get_buffer (vm, pi1);
172 ip0 = vlib_buffer_get_current (p0);
173 ip1 = vlib_buffer_get_current (p1);
174 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
175 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
177 lb0 = load_balance_get (lbi0);
178 lb1 = load_balance_get (lbi1);
181 * this node is for via FIBs we can re-use the hash value from the
182 * to node if present.
183 * We don't want to use the same hash value at each level in the recursion
184 * graph as that would lead to polarisation
188 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
190 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
192 hc0 = vnet_buffer (p0)->ip.flow_hash =
193 vnet_buffer (p0)->ip.flow_hash >> 1;
197 hc0 = vnet_buffer (p0)->ip.flow_hash =
198 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
200 dpo0 = load_balance_get_fwd_bucket
201 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
205 dpo0 = load_balance_get_bucket_i (lb0, 0);
207 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
209 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
211 hc1 = vnet_buffer (p1)->ip.flow_hash =
212 vnet_buffer (p1)->ip.flow_hash >> 1;
216 hc1 = vnet_buffer (p1)->ip.flow_hash =
217 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
219 dpo1 = load_balance_get_fwd_bucket
220 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
224 dpo1 = load_balance_get_bucket_i (lb1, 0);
227 next0 = dpo0->dpoi_next_node;
228 next1 = dpo1->dpoi_next_node;
230 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
231 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
233 vlib_increment_combined_counter
234 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
235 vlib_increment_combined_counter
236 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
238 vlib_validate_buffer_enqueue_x2 (vm, node, next,
239 to_next, n_left_to_next,
240 pi0, pi1, next0, next1);
243 while (n_left_from > 0 && n_left_to_next > 0)
245 ip_lookup_next_t next0;
246 const load_balance_t *lb0;
249 const ip4_header_t *ip0;
250 const dpo_id_t *dpo0;
259 p0 = vlib_get_buffer (vm, pi0);
261 ip0 = vlib_buffer_get_current (p0);
262 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
264 lb0 = load_balance_get (lbi0);
267 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
269 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
271 hc0 = vnet_buffer (p0)->ip.flow_hash =
272 vnet_buffer (p0)->ip.flow_hash >> 1;
276 hc0 = vnet_buffer (p0)->ip.flow_hash =
277 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
279 dpo0 = load_balance_get_fwd_bucket
280 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
284 dpo0 = load_balance_get_bucket_i (lb0, 0);
287 next0 = dpo0->dpoi_next_node;
288 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
290 vlib_increment_combined_counter
291 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
293 vlib_validate_buffer_enqueue_x1 (vm, node, next,
294 to_next, n_left_to_next,
298 vlib_put_next_frame (vm, node, next, n_left_to_next);
301 return frame->n_vectors;
305 VLIB_REGISTER_NODE (ip4_load_balance_node) =
307 .function = ip4_load_balance,
308 .name = "ip4-load-balance",
309 .vector_size = sizeof (u32),
310 .sibling_of = "ip4-lookup",
312 format_ip4_lookup_trace,
316 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
318 /* get first interface address */
320 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
321 ip_interface_address_t ** result_ia)
323 ip_lookup_main_t *lm = &im->lookup_main;
324 ip_interface_address_t *ia = 0;
325 ip4_address_t *result = 0;
328 foreach_ip_interface_address
329 (lm, ia, sw_if_index,
330 1 /* honor unnumbered */ ,
333 ip_interface_address_get_address (lm, ia);
339 *result_ia = result ? ia : 0;
344 ip4_add_interface_routes (u32 sw_if_index,
345 ip4_main_t * im, u32 fib_index,
346 ip_interface_address_t * a)
348 ip_lookup_main_t *lm = &im->lookup_main;
349 ip4_address_t *address = ip_interface_address_get_address (lm, a);
351 .fp_len = a->address_length,
352 .fp_proto = FIB_PROTOCOL_IP4,
353 .fp_addr.ip4 = *address,
356 if (pfx.fp_len <= 30)
358 /* a /30 or shorter - add a glean for the network address */
359 fib_table_entry_update_one_path (fib_index, &pfx,
360 FIB_SOURCE_INTERFACE,
361 (FIB_ENTRY_FLAG_CONNECTED |
362 FIB_ENTRY_FLAG_ATTACHED),
364 /* No next-hop address */
370 // no out-label stack
372 FIB_ROUTE_PATH_FLAG_NONE);
374 /* Add the two broadcast addresses as drop */
375 fib_prefix_t net_pfx = {
377 .fp_proto = FIB_PROTOCOL_IP4,
378 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
380 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
381 fib_table_entry_special_add(fib_index,
383 FIB_SOURCE_INTERFACE,
384 (FIB_ENTRY_FLAG_DROP |
385 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
386 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
387 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
388 fib_table_entry_special_add(fib_index,
390 FIB_SOURCE_INTERFACE,
391 (FIB_ENTRY_FLAG_DROP |
392 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
394 else if (pfx.fp_len == 31)
396 u32 mask = clib_host_to_net_u32(1);
397 fib_prefix_t net_pfx = pfx;
400 net_pfx.fp_addr.ip4.as_u32 ^= mask;
402 /* a /31 - add the other end as an attached host */
403 fib_table_entry_update_one_path (fib_index, &net_pfx,
404 FIB_SOURCE_INTERFACE,
405 (FIB_ENTRY_FLAG_ATTACHED),
413 FIB_ROUTE_PATH_FLAG_NONE);
417 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
419 u32 classify_table_index =
420 lm->classify_table_index_by_sw_if_index[sw_if_index];
421 if (classify_table_index != (u32) ~ 0)
423 dpo_id_t dpo = DPO_INVALID;
428 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
430 fib_table_entry_special_dpo_add (fib_index,
433 FIB_ENTRY_FLAG_NONE, &dpo);
438 fib_table_entry_update_one_path (fib_index, &pfx,
439 FIB_SOURCE_INTERFACE,
440 (FIB_ENTRY_FLAG_CONNECTED |
441 FIB_ENTRY_FLAG_LOCAL),
448 FIB_ROUTE_PATH_FLAG_NONE);
452 ip4_del_interface_routes (ip4_main_t * im,
454 ip4_address_t * address, u32 address_length)
457 .fp_len = address_length,
458 .fp_proto = FIB_PROTOCOL_IP4,
459 .fp_addr.ip4 = *address,
462 if (pfx.fp_len <= 30)
464 fib_prefix_t net_pfx = {
466 .fp_proto = FIB_PROTOCOL_IP4,
467 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
469 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
470 fib_table_entry_special_remove(fib_index,
472 FIB_SOURCE_INTERFACE);
473 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
474 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
475 fib_table_entry_special_remove(fib_index,
477 FIB_SOURCE_INTERFACE);
478 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
480 else if (pfx.fp_len == 31)
482 u32 mask = clib_host_to_net_u32(1);
483 fib_prefix_t net_pfx = pfx;
486 net_pfx.fp_addr.ip4.as_u32 ^= mask;
488 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
492 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
496 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
498 ip4_main_t *im = &ip4_main;
500 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
503 * enable/disable only on the 1<->0 transition
507 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
512 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
513 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
516 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
520 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
521 sw_if_index, !is_enable, 0, 0);
524 static clib_error_t *
525 ip4_add_del_interface_address_internal (vlib_main_t * vm,
527 ip4_address_t * address,
528 u32 address_length, u32 is_del)
530 vnet_main_t *vnm = vnet_get_main ();
531 ip4_main_t *im = &ip4_main;
532 ip_lookup_main_t *lm = &im->lookup_main;
533 clib_error_t *error = 0;
534 u32 if_address_index, elts_before;
535 ip4_address_fib_t ip4_af, *addr_fib = 0;
537 /* local0 interface doesn't support IP addressing */
538 if (sw_if_index == 0)
541 clib_error_create ("local0 interface doesn't support IP addressing");
544 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
545 ip4_addr_fib_init (&ip4_af, address,
546 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
547 vec_add1 (addr_fib, ip4_af);
550 * there is no support for adj-fib handling in the presence of overlapping
551 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
557 /* When adding an address check that it does not conflict
558 with an existing address on any interface in this table. */
559 ip_interface_address_t *ia;
560 vnet_sw_interface_t *sif;
562 pool_foreach(sif, vnm->interface_main.sw_interfaces,
564 if (im->fib_index_by_sw_if_index[sw_if_index] ==
565 im->fib_index_by_sw_if_index[sif->sw_if_index])
567 foreach_ip_interface_address
568 (&im->lookup_main, ia, sif->sw_if_index,
569 0 /* honor unnumbered */ ,
572 ip_interface_address_get_address
573 (&im->lookup_main, ia);
574 if (ip4_destination_matches_route
575 (im, address, x, ia->address_length) ||
576 ip4_destination_matches_route (im,
581 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
585 ("failed to add %U which conflicts with %U for interface %U",
586 format_ip4_address_and_length, address,
588 format_ip4_address_and_length, x,
590 format_vnet_sw_if_index_name, vnm,
599 elts_before = pool_elts (lm->if_address_pool);
601 error = ip_interface_address_add_del
602 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
606 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
609 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
611 ip4_add_interface_routes (sw_if_index,
612 im, ip4_af.fib_index,
614 (lm->if_address_pool, if_address_index));
616 /* If pool did not grow/shrink: add duplicate address. */
617 if (elts_before != pool_elts (lm->if_address_pool))
619 ip4_add_del_interface_address_callback_t *cb;
620 vec_foreach (cb, im->add_del_interface_address_callbacks)
621 cb->function (im, cb->function_opaque, sw_if_index,
622 address, address_length, if_address_index, is_del);
631 ip4_add_del_interface_address (vlib_main_t * vm,
633 ip4_address_t * address,
634 u32 address_length, u32 is_del)
636 return ip4_add_del_interface_address_internal
637 (vm, sw_if_index, address, address_length, is_del);
640 /* Built-in ip4 unicast rx feature path definition */
642 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
644 .arc_name = "ip4-unicast",
645 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
646 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
649 VNET_FEATURE_INIT (ip4_flow_classify, static) =
651 .arc_name = "ip4-unicast",
652 .node_name = "ip4-flow-classify",
653 .runs_before = VNET_FEATURES ("ip4-inacl"),
656 VNET_FEATURE_INIT (ip4_inacl, static) =
658 .arc_name = "ip4-unicast",
659 .node_name = "ip4-inacl",
660 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
663 VNET_FEATURE_INIT (ip4_source_check_1, static) =
665 .arc_name = "ip4-unicast",
666 .node_name = "ip4-source-check-via-rx",
667 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
670 VNET_FEATURE_INIT (ip4_source_check_2, static) =
672 .arc_name = "ip4-unicast",
673 .node_name = "ip4-source-check-via-any",
674 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
677 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
679 .arc_name = "ip4-unicast",
680 .node_name = "ip4-source-and-port-range-check-rx",
681 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
684 VNET_FEATURE_INIT (ip4_policer_classify, static) =
686 .arc_name = "ip4-unicast",
687 .node_name = "ip4-policer-classify",
688 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
691 VNET_FEATURE_INIT (ip4_ipsec, static) =
693 .arc_name = "ip4-unicast",
694 .node_name = "ipsec-input-ip4",
695 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
698 VNET_FEATURE_INIT (ip4_vpath, static) =
700 .arc_name = "ip4-unicast",
701 .node_name = "vpath-input-ip4",
702 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
705 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
707 .arc_name = "ip4-unicast",
708 .node_name = "ip4-vxlan-bypass",
709 .runs_before = VNET_FEATURES ("ip4-lookup"),
712 VNET_FEATURE_INIT (ip4_not_enabled, static) =
714 .arc_name = "ip4-unicast",
715 .node_name = "ip4-not-enabled",
716 .runs_before = VNET_FEATURES ("ip4-lookup"),
719 VNET_FEATURE_INIT (ip4_lookup, static) =
721 .arc_name = "ip4-unicast",
722 .node_name = "ip4-lookup",
723 .runs_before = 0, /* not before any other features */
726 /* Built-in ip4 multicast rx feature path definition */
727 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
729 .arc_name = "ip4-multicast",
730 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
731 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
734 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
736 .arc_name = "ip4-multicast",
737 .node_name = "vpath-input-ip4",
738 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
741 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
743 .arc_name = "ip4-multicast",
744 .node_name = "ip4-not-enabled",
745 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
748 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
750 .arc_name = "ip4-multicast",
751 .node_name = "ip4-mfib-forward-lookup",
752 .runs_before = 0, /* last feature */
755 /* Source and port-range check ip4 tx feature path definition */
756 VNET_FEATURE_ARC_INIT (ip4_output, static) =
758 .arc_name = "ip4-output",
759 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
760 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
763 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
765 .arc_name = "ip4-output",
766 .node_name = "ip4-source-and-port-range-check-tx",
767 .runs_before = VNET_FEATURES ("ip4-outacl"),
770 VNET_FEATURE_INIT (ip4_outacl, static) =
772 .arc_name = "ip4-output",
773 .node_name = "ip4-outacl",
774 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
777 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
779 .arc_name = "ip4-output",
780 .node_name = "ipsec-output-ip4",
781 .runs_before = VNET_FEATURES ("interface-output"),
784 /* Built-in ip4 tx feature path definition */
785 VNET_FEATURE_INIT (ip4_interface_output, static) =
787 .arc_name = "ip4-output",
788 .node_name = "interface-output",
789 .runs_before = 0, /* not before any other features */
793 static clib_error_t *
794 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
796 ip4_main_t *im = &ip4_main;
798 /* Fill in lookup tables with default table (0). */
799 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
800 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
804 ip4_main_t *im4 = &ip4_main;
805 ip_lookup_main_t *lm4 = &im4->lookup_main;
806 ip_interface_address_t *ia = 0;
807 ip4_address_t *address;
808 vlib_main_t *vm = vlib_get_main ();
810 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
812 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
814 address = ip_interface_address_get_address (lm4, ia);
815 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
820 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
823 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
824 sw_if_index, is_add, 0, 0);
826 return /* no error */ 0;
829 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
831 /* Global IP4 main. */
835 ip4_lookup_init (vlib_main_t * vm)
837 ip4_main_t *im = &ip4_main;
841 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
843 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
845 if ((error = vlib_call_init_function (vm, fib_module_init)))
847 if ((error = vlib_call_init_function (vm, mfib_module_init)))
850 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
855 m = pow2_mask (i) << (32 - i);
858 im->fib_masks[i] = clib_host_to_net_u32 (m);
861 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
863 /* Create FIB with index 0 and table id of 0. */
864 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
865 FIB_SOURCE_DEFAULT_ROUTE);
866 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
867 MFIB_SOURCE_DEFAULT_ROUTE);
871 pn = pg_get_node (ip4_lookup_node.index);
872 pn->unformat_edit = unformat_pg_ip4_header;
876 ethernet_arp_header_t h;
878 memset (&h, 0, sizeof (h));
880 /* Set target ethernet address to all zeros. */
881 memset (h.ip4_over_ethernet[1].ethernet, 0,
882 sizeof (h.ip4_over_ethernet[1].ethernet));
884 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
885 #define _8(f,v) h.f = v;
886 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
887 _16 (l3_type, ETHERNET_TYPE_IP4);
888 _8 (n_l2_address_bytes, 6);
889 _8 (n_l3_address_bytes, 4);
890 _16 (opcode, ETHERNET_ARP_OPCODE_request);
894 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
897 /* alloc chunk size */ 8,
904 VLIB_INIT_FUNCTION (ip4_lookup_init);
908 /* Adjacency taken. */
913 /* Packet data, possibly *after* rewrite. */
914 u8 packet_data[64 - 1 * sizeof (u32)];
916 ip4_forward_next_trace_t;
919 format_ip4_forward_next_trace (u8 * s, va_list * args)
921 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
922 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
923 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
924 u32 indent = format_get_indent (s);
925 s = format (s, "%U%U",
926 format_white_space, indent,
927 format_ip4_header, t->packet_data, sizeof (t->packet_data));
932 format_ip4_lookup_trace (u8 * s, va_list * args)
934 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
935 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
936 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
937 u32 indent = format_get_indent (s);
939 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
940 t->fib_index, t->dpo_index, t->flow_hash);
941 s = format (s, "\n%U%U",
942 format_white_space, indent,
943 format_ip4_header, t->packet_data, sizeof (t->packet_data));
948 format_ip4_rewrite_trace (u8 * s, va_list * args)
950 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
951 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
952 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
953 u32 indent = format_get_indent (s);
955 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
956 t->fib_index, t->dpo_index, format_ip_adjacency,
957 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
958 s = format (s, "\n%U%U",
959 format_white_space, indent,
960 format_ip_adjacency_packet_data,
961 t->dpo_index, t->packet_data, sizeof (t->packet_data));
965 /* Common trace function for all ip4-forward next nodes. */
967 ip4_forward_next_trace (vlib_main_t * vm,
968 vlib_node_runtime_t * node,
969 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
972 ip4_main_t *im = &ip4_main;
974 n_left = frame->n_vectors;
975 from = vlib_frame_vector_args (frame);
980 vlib_buffer_t *b0, *b1;
981 ip4_forward_next_trace_t *t0, *t1;
983 /* Prefetch next iteration. */
984 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
985 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
990 b0 = vlib_get_buffer (vm, bi0);
991 b1 = vlib_get_buffer (vm, bi1);
993 if (b0->flags & VLIB_BUFFER_IS_TRACED)
995 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
996 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
997 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
999 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1000 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1001 vec_elt (im->fib_index_by_sw_if_index,
1002 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1004 clib_memcpy (t0->packet_data,
1005 vlib_buffer_get_current (b0),
1006 sizeof (t0->packet_data));
1008 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1010 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1011 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1012 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1014 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1015 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1016 vec_elt (im->fib_index_by_sw_if_index,
1017 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1018 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1019 sizeof (t1->packet_data));
1029 ip4_forward_next_trace_t *t0;
1033 b0 = vlib_get_buffer (vm, bi0);
1035 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1037 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1038 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1039 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1041 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1042 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1043 vec_elt (im->fib_index_by_sw_if_index,
1044 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1045 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1046 sizeof (t0->packet_data));
1053 /* Compute TCP/UDP/ICMP4 checksum in software. */
1055 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1059 u32 ip_header_length, payload_length_host_byte_order;
1060 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1062 void *data_this_buffer;
1064 /* Initialize checksum with ip header. */
1065 ip_header_length = ip4_header_bytes (ip0);
1066 payload_length_host_byte_order =
1067 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1069 clib_host_to_net_u32 (payload_length_host_byte_order +
1070 (ip0->protocol << 16));
1072 if (BITS (uword) == 32)
1075 ip_csum_with_carry (sum0,
1076 clib_mem_unaligned (&ip0->src_address, u32));
1078 ip_csum_with_carry (sum0,
1079 clib_mem_unaligned (&ip0->dst_address, u32));
1083 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1085 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1086 data_this_buffer = (void *) ip0 + ip_header_length;
1087 n_ip_bytes_this_buffer =
1088 p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1089 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1091 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1092 n_ip_bytes_this_buffer - ip_header_length : 0;
1096 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1097 n_bytes_left -= n_this_buffer;
1098 if (n_bytes_left == 0)
1101 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1102 p0 = vlib_get_buffer (vm, p0->next_buffer);
1103 data_this_buffer = vlib_buffer_get_current (p0);
1104 n_this_buffer = p0->current_length;
1107 sum16 = ~ip_csum_fold (sum0);
1113 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1115 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1119 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1120 || ip0->protocol == IP_PROTOCOL_UDP);
1122 udp0 = (void *) (ip0 + 1);
1123 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1125 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1126 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1130 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1132 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1133 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1139 VNET_FEATURE_ARC_INIT (ip4_local) =
1141 .arc_name = "ip4-local",
1142 .start_nodes = VNET_FEATURES ("ip4-local"),
1147 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1148 ip4_header_t * ip, u8 is_udp, u8 * error,
1152 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1153 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1157 u32 ip_len, udp_len;
1159 udp = ip4_next_header (ip);
1160 /* Verify UDP length. */
1161 ip_len = clib_net_to_host_u16 (ip->length);
1162 udp_len = clib_net_to_host_u16 (udp->length);
1164 len_diff = ip_len - udp_len;
1165 *good_tcp_udp &= len_diff >= 0;
1166 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1170 #define ip4_local_csum_is_offloaded(_b) \
1171 _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \
1172 || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1174 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1175 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1176 || ip4_local_csum_is_offloaded (_b)))
1178 #define ip4_local_csum_is_valid(_b) \
1179 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1180 || (ip4_local_csum_is_offloaded (_b))) != 0
1183 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1184 ip4_header_t * ih, u8 * error)
1186 u8 is_udp, is_tcp_udp, good_tcp_udp;
1188 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1189 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1191 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1192 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1194 good_tcp_udp = ip4_local_csum_is_valid (b);
1196 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1197 *error = (is_tcp_udp && !good_tcp_udp
1198 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1202 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1203 ip4_header_t ** ih, u8 * error)
1205 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1207 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1208 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1210 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1211 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1213 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1214 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1216 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1217 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1220 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1223 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1227 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1228 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1229 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1230 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1234 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1235 vlib_buffer_t * b, u16 * next, u8 error,
1236 u8 head_of_feature_arc)
1238 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1241 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1242 b->error = error ? error_node->errors[error] : 0;
1243 if (head_of_feature_arc)
1246 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1248 vnet_feature_arc_start (arc_index,
1249 vnet_buffer (b)->sw_if_index[VLIB_RX],
1261 } ip4_local_last_check_t;
1264 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1265 ip4_local_last_check_t * last_check, u8 * error0)
1267 ip4_fib_mtrie_leaf_t leaf0;
1268 ip4_fib_mtrie_t *mtrie0;
1269 const dpo_id_t *dpo0;
1270 load_balance_t *lb0;
1273 vnet_buffer (b)->ip.fib_index =
1274 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1275 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1277 if (PREDICT_FALSE (last_check->src.as_u32 != ip0->src_address.as_u32))
1279 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1280 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1281 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1282 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1283 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1285 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1286 vnet_buffer (b)->ip.adj_index[VLIB_RX] = lbi0;
1288 lb0 = load_balance_get (lbi0);
1289 dpo0 = load_balance_get_bucket_i (lb0, 0);
1292 * Must have a route to source otherwise we drop the packet.
1293 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1296 * - the source is a recieve => it's from us => bogus, do this
1297 * first since it sets a different error code.
1298 * - uRPF check for any route to source - accept if passes.
1299 * - allow packets destined to the broadcast address from unknown sources
1302 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1303 && dpo0->dpoi_type == DPO_RECEIVE) ?
1304 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1305 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1306 && !fib_urpf_check_size (lb0->lb_urpf)
1307 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1308 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1310 last_check->src.as_u32 = ip0->src_address.as_u32;
1311 last_check->lbi = lbi0;
1312 last_check->error = *error0;
1316 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1317 vnet_buffer (b)->ip.adj_index[VLIB_RX] = last_check->lbi;
1318 *error0 = last_check->error;
1323 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1324 ip4_local_last_check_t * last_check, u8 * error)
1326 ip4_fib_mtrie_leaf_t leaf[2];
1327 ip4_fib_mtrie_t *mtrie[2];
1328 const dpo_id_t *dpo[2];
1329 load_balance_t *lb[2];
1330 u32 not_last_hit = 0;
1333 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1334 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1336 vnet_buffer (b[0])->ip.fib_index =
1337 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1338 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1339 vnet_buffer (b[0])->ip.fib_index;
1341 vnet_buffer (b[1])->ip.fib_index =
1342 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1343 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1344 vnet_buffer (b[1])->ip.fib_index;
1346 if (PREDICT_FALSE (not_last_hit))
1348 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1349 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1351 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1352 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1354 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1355 &ip[0]->src_address, 2);
1356 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1357 &ip[1]->src_address, 2);
1359 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1360 &ip[0]->src_address, 3);
1361 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1362 &ip[1]->src_address, 3);
1364 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1365 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1367 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1368 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = lbi[0];
1370 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1371 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = lbi[1];
1373 lb[0] = load_balance_get (lbi[0]);
1374 lb[1] = load_balance_get (lbi[1]);
1376 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1377 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1379 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1380 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1381 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1382 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1383 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1384 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1385 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1387 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1388 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1389 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1390 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1391 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1392 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1393 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1395 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1396 last_check->lbi = lbi[1];
1397 last_check->error = error[1];
1401 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1402 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] = last_check->lbi;
1404 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1405 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] = last_check->lbi;
1407 error[0] = last_check->error;
1408 error[1] = last_check->error;
1413 ip4_local_inline (vlib_main_t * vm,
1414 vlib_node_runtime_t * node,
1415 vlib_frame_t * frame, int head_of_feature_arc)
1417 ip4_main_t *im = &ip4_main;
1418 ip_lookup_main_t *lm = &im->lookup_main;
1419 u32 *from, n_left_from;
1420 vlib_node_runtime_t *error_node =
1421 vlib_node_get_runtime (vm, ip4_input_node.index);
1422 u16 nexts[VLIB_FRAME_SIZE], *next;
1423 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1424 ip4_header_t *ip[2];
1427 ip4_local_last_check_t last_check = {
1428 .src = {.as_u32 = 0},
1430 .error = IP4_ERROR_UNKNOWN_PROTOCOL
1433 from = vlib_frame_vector_args (frame);
1434 n_left_from = frame->n_vectors;
1436 if (node->flags & VLIB_NODE_FLAG_TRACE)
1437 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1439 vlib_get_buffers (vm, from, bufs, n_left_from);
1443 while (n_left_from >= 6)
1445 u32 is_nat, not_batch = 0;
1447 /* Prefetch next iteration. */
1449 vlib_prefetch_buffer_header (b[4], LOAD);
1450 vlib_prefetch_buffer_header (b[5], LOAD);
1452 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1453 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1456 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1458 ip[0] = vlib_buffer_get_current (b[0]);
1459 ip[1] = vlib_buffer_get_current (b[1]);
1461 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1462 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1464 is_nat = b[0]->flags & VNET_BUFFER_F_IS_NATED;
1465 not_batch |= is_nat ^ (b[1]->flags & VNET_BUFFER_F_IS_NATED);
1467 if (head_of_feature_arc == 0 || (is_nat && not_batch == 0))
1470 if (PREDICT_TRUE (not_batch == 0))
1472 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1473 ip4_local_check_src_x2 (b, ip, &last_check, error);
1477 if (!(b[0]->flags & VNET_BUFFER_F_IS_NATED))
1479 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1480 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1482 if (!(b[1]->flags & VNET_BUFFER_F_IS_NATED))
1484 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1485 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1491 next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1492 next[1] = lm->local_next_by_ip_protocol[ip[1]->protocol];
1493 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1494 head_of_feature_arc);
1495 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1496 head_of_feature_arc);
1503 while (n_left_from > 0)
1505 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1507 ip[0] = vlib_buffer_get_current (b[0]);
1508 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1510 if (head_of_feature_arc == 0 || (b[0]->flags & VNET_BUFFER_F_IS_NATED))
1513 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1514 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1518 next[0] = lm->local_next_by_ip_protocol[ip[0]->protocol];
1519 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1520 head_of_feature_arc);
1527 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1528 return frame->n_vectors;
1532 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1534 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1538 VLIB_REGISTER_NODE (ip4_local_node) =
1540 .function = ip4_local,
1541 .name = "ip4-local",
1542 .vector_size = sizeof (u32),
1543 .format_trace = format_ip4_forward_next_trace,
1544 .n_next_nodes = IP_LOCAL_N_NEXT,
1547 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1548 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1549 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1550 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1555 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1558 ip4_local_end_of_arc (vlib_main_t * vm,
1559 vlib_node_runtime_t * node, vlib_frame_t * frame)
1561 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1565 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1566 .function = ip4_local_end_of_arc,
1567 .name = "ip4-local-end-of-arc",
1568 .vector_size = sizeof (u32),
1570 .format_trace = format_ip4_forward_next_trace,
1571 .sibling_of = "ip4-local",
1574 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1576 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1577 .arc_name = "ip4-local",
1578 .node_name = "ip4-local-end-of-arc",
1579 .runs_before = 0, /* not before any other features */
1584 ip4_register_protocol (u32 protocol, u32 node_index)
1586 vlib_main_t *vm = vlib_get_main ();
1587 ip4_main_t *im = &ip4_main;
1588 ip_lookup_main_t *lm = &im->lookup_main;
1590 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1591 lm->local_next_by_ip_protocol[protocol] =
1592 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1595 static clib_error_t *
1596 show_ip_local_command_fn (vlib_main_t * vm,
1597 unformat_input_t * input, vlib_cli_command_t * cmd)
1599 ip4_main_t *im = &ip4_main;
1600 ip_lookup_main_t *lm = &im->lookup_main;
1603 vlib_cli_output (vm, "Protocols handled by ip4_local");
1604 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1606 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1608 u32 node_index = vlib_get_node (vm,
1609 ip4_local_node.index)->
1610 next_nodes[lm->local_next_by_ip_protocol[i]];
1611 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1621 * Display the set of protocols handled by the local IPv4 stack.
1624 * Example of how to display local protocol table:
1625 * @cliexstart{show ip local}
1626 * Protocols handled by ip4_local
1633 VLIB_CLI_COMMAND (show_ip_local, static) =
1635 .path = "show ip local",
1636 .function = show_ip_local_command_fn,
1637 .short_help = "show ip local",
1642 ip4_arp_inline (vlib_main_t * vm,
1643 vlib_node_runtime_t * node,
1644 vlib_frame_t * frame, int is_glean)
1646 vnet_main_t *vnm = vnet_get_main ();
1647 ip4_main_t *im = &ip4_main;
1648 ip_lookup_main_t *lm = &im->lookup_main;
1649 u32 *from, *to_next_drop;
1650 uword n_left_from, n_left_to_next_drop, next_index;
1651 static f64 time_last_seed_change = -1e100;
1652 static u32 hash_seeds[3];
1653 static uword hash_bitmap[256 / BITS (uword)];
1656 if (node->flags & VLIB_NODE_FLAG_TRACE)
1657 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1659 time_now = vlib_time_now (vm);
1660 if (time_now - time_last_seed_change > 1e-3)
1663 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
1664 sizeof (hash_seeds));
1665 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1666 hash_seeds[i] = r[i];
1668 /* Mark all hash keys as been no-seen before. */
1669 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1672 time_last_seed_change = time_now;
1675 from = vlib_frame_vector_args (frame);
1676 n_left_from = frame->n_vectors;
1677 next_index = node->cached_next_index;
1678 if (next_index == IP4_ARP_NEXT_DROP)
1679 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1681 while (n_left_from > 0)
1683 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1684 to_next_drop, n_left_to_next_drop);
1686 while (n_left_from > 0 && n_left_to_next_drop > 0)
1688 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1689 ip_adjacency_t *adj0;
1696 p0 = vlib_get_buffer (vm, pi0);
1698 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1699 adj0 = adj_get (adj_index0);
1700 ip0 = vlib_buffer_get_current (p0);
1706 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1707 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1712 * this is the Glean case, so we are ARPing for the
1713 * packet's destination
1715 a0 ^= ip0->dst_address.data_u32;
1719 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
1723 hash_v3_mix32 (a0, b0, c0);
1724 hash_v3_finalize32 (a0, b0, c0);
1726 c0 &= BITS (hash_bitmap) - 1;
1727 m0 = (uword) 1 << (c0 % BITS (uword));
1728 c0 = c0 / BITS (uword);
1730 bm0 = hash_bitmap[c0];
1731 drop0 = (bm0 & m0) != 0;
1733 /* Mark it as seen. */
1734 hash_bitmap[c0] = bm0 | m0;
1738 to_next_drop[0] = pi0;
1740 n_left_to_next_drop -= 1;
1743 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
1744 IP4_ARP_ERROR_REQUEST_SENT];
1747 * the adj has been updated to a rewrite but the node the DPO that got
1748 * us here hasn't - yet. no big deal. we'll drop while we wait.
1750 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1757 * Can happen if the control-plane is programming tables
1758 * with traffic flowing; at least that's today's lame excuse.
1760 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
1761 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
1763 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
1766 /* Send ARP request. */
1770 ethernet_arp_header_t *h0;
1771 vnet_hw_interface_t *hw_if0;
1774 vlib_packet_template_get_packet (vm,
1775 &im->ip4_arp_request_packet_template,
1778 /* Seems we're out of buffers */
1779 if (PREDICT_FALSE (!h0))
1782 /* Add rewrite/encap string for ARP packet. */
1783 vnet_rewrite_one_header (adj0[0], h0,
1784 sizeof (ethernet_header_t));
1786 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1788 /* Src ethernet address in ARP header. */
1789 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
1791 sizeof (h0->ip4_over_ethernet[0].ethernet));
1795 /* The interface's source address is stashed in the Glean Adj */
1796 h0->ip4_over_ethernet[0].ip4 =
1797 adj0->sub_type.glean.receive_addr.ip4;
1799 /* Copy in destination address we are requesting. This is the
1800 * glean case, so it's the packet's destination.*/
1801 h0->ip4_over_ethernet[1].ip4.data_u32 =
1802 ip0->dst_address.data_u32;
1806 /* Src IP address in ARP header. */
1807 if (ip4_src_address_for_packet (lm, sw_if_index0,
1809 ip4_over_ethernet[0].ip4))
1811 /* No source address available */
1813 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
1814 vlib_buffer_free (vm, &bi0, 1);
1818 /* Copy in destination address we are requesting from the
1820 h0->ip4_over_ethernet[1].ip4.data_u32 =
1821 adj0->sub_type.nbr.next_hop.ip4.as_u32;
1824 vlib_buffer_copy_trace_flag (vm, p0, bi0);
1825 b0 = vlib_get_buffer (vm, bi0);
1826 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
1827 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
1829 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1831 vlib_set_next_frame_buffer (vm, node,
1832 adj0->rewrite_header.next_index,
1837 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
1840 return frame->n_vectors;
1844 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1846 return (ip4_arp_inline (vm, node, frame, 0));
1850 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1852 return (ip4_arp_inline (vm, node, frame, 1));
1855 static char *ip4_arp_error_strings[] = {
1856 [IP4_ARP_ERROR_DROP] = "address overflow drops",
1857 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
1858 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
1859 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
1860 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
1861 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
1865 VLIB_REGISTER_NODE (ip4_arp_node) =
1867 .function = ip4_arp,
1869 .vector_size = sizeof (u32),
1870 .format_trace = format_ip4_forward_next_trace,
1871 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1872 .error_strings = ip4_arp_error_strings,
1873 .n_next_nodes = IP4_ARP_N_NEXT,
1876 [IP4_ARP_NEXT_DROP] = "error-drop",
1880 VLIB_REGISTER_NODE (ip4_glean_node) =
1882 .function = ip4_glean,
1883 .name = "ip4-glean",
1884 .vector_size = sizeof (u32),
1885 .format_trace = format_ip4_forward_next_trace,
1886 .n_errors = ARRAY_LEN (ip4_arp_error_strings),
1887 .error_strings = ip4_arp_error_strings,
1888 .n_next_nodes = IP4_ARP_N_NEXT,
1890 [IP4_ARP_NEXT_DROP] = "error-drop",
1895 #define foreach_notrace_ip4_arp_error \
1902 arp_notrace_init (vlib_main_t * vm)
1904 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
1906 /* don't trace ARP request packets */
1908 vnet_pcap_drop_trace_filter_add_del \
1909 (rt->errors[IP4_ARP_ERROR_##a], \
1911 foreach_notrace_ip4_arp_error;
1916 VLIB_INIT_FUNCTION (arp_notrace_init);
1919 /* Send an ARP request to see if given destination is reachable on given interface. */
1921 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index,
1924 vnet_main_t *vnm = vnet_get_main ();
1925 ip4_main_t *im = &ip4_main;
1926 ethernet_arp_header_t *h;
1928 ip_interface_address_t *ia;
1929 ip_adjacency_t *adj;
1930 vnet_hw_interface_t *hi;
1931 vnet_sw_interface_t *si;
1935 u8 unicast_rewrite = 0;
1937 si = vnet_get_sw_interface (vnm, sw_if_index);
1939 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1941 return clib_error_return (0, "%U: interface %U down",
1942 format_ip4_address, dst,
1943 format_vnet_sw_if_index_name, vnm,
1948 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1951 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1952 return clib_error_return
1954 "no matching interface address for destination %U (interface %U)",
1955 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
1959 h = vlib_packet_template_get_packet (vm,
1960 &im->ip4_arp_request_packet_template,
1963 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1964 if (PREDICT_FALSE (!hi->hw_address))
1966 return clib_error_return (0, "%U: interface %U do not support ip probe",
1967 format_ip4_address, dst,
1968 format_vnet_sw_if_index_name, vnm,
1972 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
1973 sizeof (h->ip4_over_ethernet[0].ethernet));
1975 h->ip4_over_ethernet[0].ip4 = src[0];
1976 h->ip4_over_ethernet[1].ip4 = dst[0];
1978 b = vlib_get_buffer (vm, bi);
1979 vnet_buffer (b)->sw_if_index[VLIB_RX] =
1980 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1982 ip46_address_t nh = {
1986 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
1987 VNET_LINK_IP4, &nh, sw_if_index);
1990 /* Peer has been previously resolved, retrieve glean adj instead */
1991 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
1994 unicast_rewrite = 1;
1998 ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4,
1999 VNET_LINK_IP4, sw_if_index, &nh);
2004 /* Add encapsulation string for software interface (e.g. ethernet header). */
2005 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2006 if (unicast_rewrite)
2008 u16 *etype = vlib_buffer_get_current (b) - 2;
2009 etype[0] = clib_host_to_net_u16 (ETHERNET_TYPE_ARP);
2011 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2014 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2015 u32 *to_next = vlib_frame_vector_args (f);
2018 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2022 return /* no error */ 0;
2027 IP4_REWRITE_NEXT_DROP,
2028 IP4_REWRITE_NEXT_ICMP_ERROR,
2029 IP4_REWRITE_NEXT_FRAGMENT,
2030 IP4_REWRITE_N_NEXT /* Last */
2031 } ip4_rewrite_next_t;
2034 * This bits of an IPv4 address to mask to construct a multicast
2037 #if CLIB_ARCH_IS_BIG_ENDIAN
2038 #define IP4_MCAST_ADDR_MASK 0x007fffff
2040 #define IP4_MCAST_ADDR_MASK 0xffff7f00
2044 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
2045 u16 adj_packet_bytes, bool df, u32 * next, u32 * error)
2047 if (packet_len > adj_packet_bytes)
2049 *error = IP4_ERROR_MTU_EXCEEDED;
2052 icmp4_error_set_vnet_buffer
2053 (b, ICMP4_destination_unreachable,
2054 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
2056 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2060 /* IP fragmentation */
2061 ip_frag_set_vnet_buffer (b, 0, adj_packet_bytes,
2062 IP4_FRAG_NEXT_IP4_LOOKUP, 0);
2063 *next = IP4_REWRITE_NEXT_FRAGMENT;
2069 ip4_rewrite_inline (vlib_main_t * vm,
2070 vlib_node_runtime_t * node,
2071 vlib_frame_t * frame,
2072 int do_counters, int is_midchain, int is_mcast)
2074 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2075 u32 *from = vlib_frame_vector_args (frame);
2076 u32 n_left_from, n_left_to_next, *to_next, next_index;
2077 vlib_node_runtime_t *error_node =
2078 vlib_node_get_runtime (vm, ip4_input_node.index);
2080 n_left_from = frame->n_vectors;
2081 next_index = node->cached_next_index;
2082 u32 thread_index = vlib_get_thread_index ();
2084 while (n_left_from > 0)
2086 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2088 while (n_left_from >= 4 && n_left_to_next >= 2)
2090 ip_adjacency_t *adj0, *adj1;
2091 vlib_buffer_t *p0, *p1;
2092 ip4_header_t *ip0, *ip1;
2093 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2094 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2095 u32 tx_sw_if_index0, tx_sw_if_index1;
2097 /* Prefetch next iteration. */
2099 vlib_buffer_t *p2, *p3;
2101 p2 = vlib_get_buffer (vm, from[2]);
2102 p3 = vlib_get_buffer (vm, from[3]);
2104 vlib_prefetch_buffer_header (p2, STORE);
2105 vlib_prefetch_buffer_header (p3, STORE);
2107 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2108 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2111 pi0 = to_next[0] = from[0];
2112 pi1 = to_next[1] = from[1];
2117 n_left_to_next -= 2;
2119 p0 = vlib_get_buffer (vm, pi0);
2120 p1 = vlib_get_buffer (vm, pi1);
2122 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2123 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2126 * pre-fetch the per-adjacency counters
2130 vlib_prefetch_combined_counter (&adjacency_counters,
2131 thread_index, adj_index0);
2132 vlib_prefetch_combined_counter (&adjacency_counters,
2133 thread_index, adj_index1);
2136 ip0 = vlib_buffer_get_current (p0);
2137 ip1 = vlib_buffer_get_current (p1);
2139 error0 = error1 = IP4_ERROR_NONE;
2140 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2142 /* Decrement TTL & update checksum.
2143 Works either endian, so no need for byte swap. */
2144 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2146 i32 ttl0 = ip0->ttl;
2148 /* Input node should have reject packets with ttl 0. */
2149 ASSERT (ip0->ttl > 0);
2151 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2152 checksum0 += checksum0 >= 0xffff;
2154 ip0->checksum = checksum0;
2159 * If the ttl drops below 1 when forwarding, generate
2162 if (PREDICT_FALSE (ttl0 <= 0))
2164 error0 = IP4_ERROR_TIME_EXPIRED;
2165 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2166 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2167 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2169 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2172 /* Verify checksum. */
2173 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2174 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2178 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2180 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2182 i32 ttl1 = ip1->ttl;
2184 /* Input node should have reject packets with ttl 0. */
2185 ASSERT (ip1->ttl > 0);
2187 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2188 checksum1 += checksum1 >= 0xffff;
2190 ip1->checksum = checksum1;
2195 * If the ttl drops below 1 when forwarding, generate
2198 if (PREDICT_FALSE (ttl1 <= 0))
2200 error1 = IP4_ERROR_TIME_EXPIRED;
2201 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2202 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2203 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2205 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2208 /* Verify checksum. */
2209 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2210 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2214 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2217 /* Rewrite packet header and updates lengths. */
2218 adj0 = adj_get (adj_index0);
2219 adj1 = adj_get (adj_index1);
2221 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2222 rw_len0 = adj0[0].rewrite_header.data_bytes;
2223 rw_len1 = adj1[0].rewrite_header.data_bytes;
2224 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2225 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2227 /* Check MTU of outgoing interface. */
2228 ip4_mtu_check (p0, clib_net_to_host_u16 (ip0->length),
2229 adj0[0].rewrite_header.max_l3_packet_bytes,
2230 ip0->flags_and_fragment_offset &
2231 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2233 ip4_mtu_check (p1, clib_net_to_host_u16 (ip1->length),
2234 adj1[0].rewrite_header.max_l3_packet_bytes,
2235 ip1->flags_and_fragment_offset &
2236 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2241 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2242 vnet_buffer (p0)->sw_if_index[VLIB_RX]) ?
2243 IP4_ERROR_SAME_INTERFACE : error0);
2244 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2245 vnet_buffer (p1)->sw_if_index[VLIB_RX]) ?
2246 IP4_ERROR_SAME_INTERFACE : error1);
2249 p0->error = error_node->errors[error0];
2250 p1->error = error_node->errors[error1];
2251 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2252 * to see the IP headerr */
2253 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2255 next0 = adj0[0].rewrite_header.next_index;
2256 p0->current_data -= rw_len0;
2257 p0->current_length += rw_len0;
2258 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2259 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2262 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2263 vnet_feature_arc_start (lm->output_feature_arc_index,
2264 tx_sw_if_index0, &next0, p0);
2266 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2268 next1 = adj1[0].rewrite_header.next_index;
2269 p1->current_data -= rw_len1;
2270 p1->current_length += rw_len1;
2272 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2273 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2276 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2277 vnet_feature_arc_start (lm->output_feature_arc_index,
2278 tx_sw_if_index1, &next1, p1);
2281 /* Guess we are only writing on simple Ethernet header. */
2282 vnet_rewrite_two_headers (adj0[0], adj1[0],
2283 ip0, ip1, sizeof (ethernet_header_t));
2286 * Bump the per-adjacency counters
2290 vlib_increment_combined_counter
2291 (&adjacency_counters,
2294 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2296 vlib_increment_combined_counter
2297 (&adjacency_counters,
2300 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2305 adj0->sub_type.midchain.fixup_func
2306 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2307 adj1->sub_type.midchain.fixup_func
2308 (vm, adj1, p1, adj0->sub_type.midchain.fixup_data);
2313 * copy bytes from the IP address into the MAC rewrite
2315 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2317 rewrite_header.dst_mcast_offset,
2318 &ip0->dst_address.as_u32,
2320 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2322 rewrite_header.dst_mcast_offset,
2323 &ip1->dst_address.as_u32,
2327 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2328 to_next, n_left_to_next,
2329 pi0, pi1, next0, next1);
2332 while (n_left_from > 0 && n_left_to_next > 0)
2334 ip_adjacency_t *adj0;
2337 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2338 u32 tx_sw_if_index0;
2340 pi0 = to_next[0] = from[0];
2342 p0 = vlib_get_buffer (vm, pi0);
2344 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2346 adj0 = adj_get (adj_index0);
2348 ip0 = vlib_buffer_get_current (p0);
2350 error0 = IP4_ERROR_NONE;
2351 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2353 /* Decrement TTL & update checksum. */
2354 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2356 i32 ttl0 = ip0->ttl;
2358 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2360 checksum0 += checksum0 >= 0xffff;
2362 ip0->checksum = checksum0;
2364 ASSERT (ip0->ttl > 0);
2370 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2371 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2373 if (PREDICT_FALSE (ttl0 <= 0))
2376 * If the ttl drops below 1 when forwarding, generate
2379 error0 = IP4_ERROR_TIME_EXPIRED;
2380 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2381 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2382 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2383 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2389 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2393 vlib_prefetch_combined_counter (&adjacency_counters,
2394 thread_index, adj_index0);
2396 /* Guess we are only writing on simple Ethernet header. */
2397 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2401 * copy bytes from the IP address into the MAC rewrite
2403 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2405 rewrite_header.dst_mcast_offset,
2406 &ip0->dst_address.as_u32,
2410 /* Update packet buffer attributes/set output interface. */
2411 rw_len0 = adj0[0].rewrite_header.data_bytes;
2412 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2415 vlib_increment_combined_counter
2416 (&adjacency_counters,
2417 thread_index, adj_index0, 1,
2418 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2420 /* Check MTU of outgoing interface. */
2421 ip4_mtu_check (p0, clib_net_to_host_u16 (ip0->length),
2422 adj0[0].rewrite_header.max_l3_packet_bytes,
2423 ip0->flags_and_fragment_offset &
2424 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2429 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2430 vnet_buffer (p0)->sw_if_index[VLIB_RX]) ?
2431 IP4_ERROR_SAME_INTERFACE : error0);
2433 p0->error = error_node->errors[error0];
2435 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2436 * to see the IP headerr */
2437 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2439 p0->current_data -= rw_len0;
2440 p0->current_length += rw_len0;
2441 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2443 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2444 next0 = adj0[0].rewrite_header.next_index;
2448 adj0->sub_type.midchain.fixup_func
2449 (vm, adj0, p0, adj0->sub_type.midchain.fixup_data);
2453 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2454 vnet_feature_arc_start (lm->output_feature_arc_index,
2455 tx_sw_if_index0, &next0, p0);
2462 n_left_to_next -= 1;
2464 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2465 to_next, n_left_to_next,
2469 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2472 /* Need to do trace after rewrites to pick up new packet data. */
2473 if (node->flags & VLIB_NODE_FLAG_TRACE)
2474 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2476 return frame->n_vectors;
2480 /** @brief IPv4 rewrite node.
2483 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2484 header checksum, fetch the ip adjacency, check the outbound mtu,
2485 apply the adjacency rewrite, and send pkts to the adjacency
2486 rewrite header's rewrite_next_index.
2488 @param vm vlib_main_t corresponding to the current thread
2489 @param node vlib_node_runtime_t
2490 @param frame vlib_frame_t whose contents should be dispatched
2492 @par Graph mechanics: buffer metadata, next index usage
2495 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2496 - the rewrite adjacency index
2497 - <code>adj->lookup_next_index</code>
2498 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2499 the packet will be dropped.
2500 - <code>adj->rewrite_header</code>
2501 - Rewrite string length, rewrite string, next_index
2504 - <code>b->current_data, b->current_length</code>
2505 - Updated net of applying the rewrite string
2507 <em>Next Indices:</em>
2508 - <code> adj->rewrite_header.next_index </code>
2512 ip4_rewrite (vlib_main_t * vm,
2513 vlib_node_runtime_t * node, 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);
2522 ip4_midchain (vlib_main_t * vm,
2523 vlib_node_runtime_t * node, 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);
2532 ip4_rewrite_mcast (vlib_main_t * vm,
2533 vlib_node_runtime_t * node, 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);
2542 ip4_mcast_midchain (vlib_main_t * vm,
2543 vlib_node_runtime_t * node, 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 .function = ip4_rewrite,
2554 .name = "ip4-rewrite",
2555 .vector_size = sizeof (u32),
2557 .format_trace = format_ip4_rewrite_trace,
2559 .n_next_nodes = IP4_REWRITE_N_NEXT,
2561 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2562 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2563 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2566 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2568 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2569 .function = ip4_rewrite_mcast,
2570 .name = "ip4-rewrite-mcast",
2571 .vector_size = sizeof (u32),
2573 .format_trace = format_ip4_rewrite_trace,
2574 .sibling_of = "ip4-rewrite",
2576 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2578 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2579 .function = ip4_mcast_midchain,
2580 .name = "ip4-mcast-midchain",
2581 .vector_size = sizeof (u32),
2583 .format_trace = format_ip4_rewrite_trace,
2584 .sibling_of = "ip4-rewrite",
2586 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2588 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2589 .function = ip4_midchain,
2590 .name = "ip4-midchain",
2591 .vector_size = sizeof (u32),
2592 .format_trace = format_ip4_forward_next_trace,
2593 .sibling_of = "ip4-rewrite",
2595 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
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,
2696 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2700 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2702 if (~0 == fib_index)
2703 return VNET_API_ERROR_NO_SUCH_FIB;
2705 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2711 static clib_error_t *
2712 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2713 unformat_input_t * input,
2714 vlib_cli_command_t * cmd)
2718 u32 flow_hash_config = 0;
2721 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2723 if (unformat (input, "table %d", &table_id))
2726 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2727 foreach_flow_hash_bit
2734 return clib_error_return (0, "unknown input `%U'",
2735 format_unformat_error, input);
2737 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2743 case VNET_API_ERROR_NO_SUCH_FIB:
2744 return clib_error_return (0, "no such FIB table %d", table_id);
2747 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2755 * Configure the set of IPv4 fields used by the flow hash.
2758 * Example of how to set the flow hash on a given table:
2759 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2760 * Example of display the configured flow hash:
2761 * @cliexstart{show ip fib}
2762 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2765 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2766 * [0] [@0]: dpo-drop ip6
2769 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2770 * [0] [@0]: dpo-drop ip6
2773 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2774 * [0] [@0]: dpo-drop ip6
2777 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2778 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2781 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2782 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2783 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2784 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2785 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2788 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2789 * [0] [@0]: dpo-drop ip6
2790 * 255.255.255.255/32
2792 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2793 * [0] [@0]: dpo-drop ip6
2794 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2797 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2798 * [0] [@0]: dpo-drop ip6
2801 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2802 * [0] [@0]: dpo-drop ip6
2805 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2806 * [0] [@4]: ipv4-glean: af_packet0
2809 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2810 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2813 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2814 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2817 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2818 * [0] [@4]: ipv4-glean: af_packet1
2821 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2822 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2825 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2826 * [0] [@0]: dpo-drop ip6
2829 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2830 * [0] [@0]: dpo-drop ip6
2831 * 255.255.255.255/32
2833 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2834 * [0] [@0]: dpo-drop ip6
2838 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2840 .path = "set ip flow-hash",
2842 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2843 .function = set_ip_flow_hash_command_fn,
2848 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2851 vnet_main_t *vnm = vnet_get_main ();
2852 vnet_interface_main_t *im = &vnm->interface_main;
2853 ip4_main_t *ipm = &ip4_main;
2854 ip_lookup_main_t *lm = &ipm->lookup_main;
2855 vnet_classify_main_t *cm = &vnet_classify_main;
2856 ip4_address_t *if_addr;
2858 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2859 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2861 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2862 return VNET_API_ERROR_NO_SUCH_ENTRY;
2864 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2865 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2867 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2869 if (NULL != if_addr)
2871 fib_prefix_t pfx = {
2873 .fp_proto = FIB_PROTOCOL_IP4,
2874 .fp_addr.ip4 = *if_addr,
2878 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2882 if (table_index != (u32) ~ 0)
2884 dpo_id_t dpo = DPO_INVALID;
2889 classify_dpo_create (DPO_PROTO_IP4, table_index));
2891 fib_table_entry_special_dpo_add (fib_index,
2893 FIB_SOURCE_CLASSIFY,
2894 FIB_ENTRY_FLAG_NONE, &dpo);
2899 fib_table_entry_special_remove (fib_index,
2900 &pfx, FIB_SOURCE_CLASSIFY);
2907 static clib_error_t *
2908 set_ip_classify_command_fn (vlib_main_t * vm,
2909 unformat_input_t * input,
2910 vlib_cli_command_t * cmd)
2912 u32 table_index = ~0;
2913 int table_index_set = 0;
2914 u32 sw_if_index = ~0;
2917 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2919 if (unformat (input, "table-index %d", &table_index))
2920 table_index_set = 1;
2921 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2922 vnet_get_main (), &sw_if_index))
2928 if (table_index_set == 0)
2929 return clib_error_return (0, "classify table-index must be specified");
2931 if (sw_if_index == ~0)
2932 return clib_error_return (0, "interface / subif must be specified");
2934 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2941 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2942 return clib_error_return (0, "No such interface");
2944 case VNET_API_ERROR_NO_SUCH_ENTRY:
2945 return clib_error_return (0, "No such classifier table");
2951 * Assign a classification table to an interface. The classification
2952 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2953 * commands. Once the table is create, use this command to filter packets
2957 * Example of how to assign a classification table to an interface:
2958 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2961 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2963 .path = "set ip classify",
2965 "set ip classify intfc <interface> table-index <classify-idx>",
2966 .function = set_ip_classify_command_fn,
2970 static clib_error_t *
2971 ip4_config (vlib_main_t * vm, unformat_input_t * input)
2973 ip4_main_t *im = &ip4_main;
2976 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2978 if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
2981 return clib_error_return (0,
2982 "invalid heap-size parameter `%U'",
2983 format_unformat_error, input);
2986 im->mtrie_heap_size = heapsize;
2991 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
2994 * fd.io coding-style-patch-verification: ON
2997 * eval: (c-set-style "gnu")