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/mfib/ip4_mfib.h>
53 #include <vnet/dpo/load_balance.h>
54 #include <vnet/dpo/load_balance_map.h>
55 #include <vnet/dpo/classify_dpo.h>
56 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
58 #include <vnet/ip/ip4_forward.h>
59 #include <vnet/interface_output.h>
60 #include <vnet/classify/vnet_classify.h>
62 /** @brief IPv4 lookup node.
65 This is the main IPv4 lookup dispatch node.
67 @param vm vlib_main_t corresponding to the current thread
68 @param node vlib_node_runtime_t
69 @param frame vlib_frame_t whose contents should be dispatched
71 @par Graph mechanics: buffer metadata, next index usage
74 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
75 - Indicates the @c sw_if_index value of the interface that the
76 packet was received on.
77 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
78 - When the value is @c ~0 then the node performs a longest prefix
79 match (LPM) for the packet destination address in the FIB attached
80 to the receive interface.
81 - Otherwise perform LPM for the packet destination address in the
82 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
83 value (0, 1, ...) and not a VRF id.
86 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
87 - The lookup result adjacency index.
90 - Dispatches the packet to the node index found in
91 ip_adjacency_t @c adj->lookup_next_index
92 (where @c adj is the lookup result adjacency).
94 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
97 return ip4_lookup_inline (vm, node, frame);
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;
119 u32 thread_index = vm->thread_index;
120 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
121 u16 nexts[VLIB_FRAME_SIZE], *next;
123 from = vlib_frame_vector_args (frame);
124 n_left = frame->n_vectors;
127 vlib_get_buffers (vm, from, bufs, n_left);
131 const load_balance_t *lb0, *lb1;
132 const ip4_header_t *ip0, *ip1;
133 u32 lbi0, hc0, lbi1, hc1;
134 const dpo_id_t *dpo0, *dpo1;
136 /* Prefetch next iteration. */
138 vlib_prefetch_buffer_header (b[2], LOAD);
139 vlib_prefetch_buffer_header (b[3], LOAD);
141 CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), LOAD);
142 CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), LOAD);
145 ip0 = vlib_buffer_get_current (b[0]);
146 ip1 = vlib_buffer_get_current (b[1]);
147 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
148 lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
150 lb0 = load_balance_get (lbi0);
151 lb1 = load_balance_get (lbi1);
154 * this node is for via FIBs we can re-use the hash value from the
155 * to node if present.
156 * We don't want to use the same hash value at each level in the recursion
157 * graph as that would lead to polarisation
161 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
163 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
165 hc0 = vnet_buffer (b[0])->ip.flow_hash =
166 vnet_buffer (b[0])->ip.flow_hash >> 1;
170 hc0 = vnet_buffer (b[0])->ip.flow_hash =
171 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
173 dpo0 = load_balance_get_fwd_bucket
174 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
178 dpo0 = load_balance_get_bucket_i (lb0, 0);
180 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
182 if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
184 hc1 = vnet_buffer (b[1])->ip.flow_hash =
185 vnet_buffer (b[1])->ip.flow_hash >> 1;
189 hc1 = vnet_buffer (b[1])->ip.flow_hash =
190 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
192 dpo1 = load_balance_get_fwd_bucket
193 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
197 dpo1 = load_balance_get_bucket_i (lb1, 0);
200 next[0] = dpo0->dpoi_next_node;
201 next[1] = dpo1->dpoi_next_node;
203 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
204 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
206 vlib_increment_combined_counter
207 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
208 vlib_increment_combined_counter
209 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
218 const load_balance_t *lb0;
219 const ip4_header_t *ip0;
220 const dpo_id_t *dpo0;
223 ip0 = vlib_buffer_get_current (b[0]);
224 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
226 lb0 = load_balance_get (lbi0);
229 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
231 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
233 hc0 = vnet_buffer (b[0])->ip.flow_hash =
234 vnet_buffer (b[0])->ip.flow_hash >> 1;
238 hc0 = vnet_buffer (b[0])->ip.flow_hash =
239 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
241 dpo0 = load_balance_get_fwd_bucket
242 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
246 dpo0 = load_balance_get_bucket_i (lb0, 0);
249 next[0] = dpo0->dpoi_next_node;
250 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
252 vlib_increment_combined_counter
253 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
260 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
261 if (node->flags & VLIB_NODE_FLAG_TRACE)
262 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
264 return frame->n_vectors;
268 VLIB_REGISTER_NODE (ip4_load_balance_node) =
270 .name = "ip4-load-balance",
271 .vector_size = sizeof (u32),
272 .sibling_of = "ip4-lookup",
273 .format_trace = format_ip4_lookup_trace,
277 #ifndef CLIB_MARCH_VARIANT
278 /* get first interface address */
280 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
281 ip_interface_address_t ** result_ia)
283 ip_lookup_main_t *lm = &im->lookup_main;
284 ip_interface_address_t *ia = 0;
285 ip4_address_t *result = 0;
288 foreach_ip_interface_address
289 (lm, ia, sw_if_index,
290 1 /* honor unnumbered */ ,
293 ip_interface_address_get_address (lm, ia);
299 *result_ia = result ? ia : 0;
305 ip4_add_subnet_bcast_route (u32 fib_index,
309 vnet_sw_interface_flags_t iflags;
311 iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
313 fib_table_entry_special_remove(fib_index,
315 FIB_SOURCE_INTERFACE);
317 if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
319 fib_table_entry_update_one_path (fib_index, pfx,
320 FIB_SOURCE_INTERFACE,
323 /* No next-hop address */
329 // no out-label stack
331 FIB_ROUTE_PATH_FLAG_NONE);
335 fib_table_entry_special_add(fib_index,
337 FIB_SOURCE_INTERFACE,
338 (FIB_ENTRY_FLAG_DROP |
339 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
344 ip4_add_interface_prefix_routes (ip4_main_t *im,
347 ip_interface_address_t * a)
349 ip_lookup_main_t *lm = &im->lookup_main;
350 ip_interface_prefix_t *if_prefix;
351 ip4_address_t *address = ip_interface_address_get_address (lm, a);
353 ip_interface_prefix_key_t key = {
355 .fp_len = a->address_length,
356 .fp_proto = FIB_PROTOCOL_IP4,
357 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[a->address_length],
359 .sw_if_index = sw_if_index,
362 fib_prefix_t pfx_special = {
363 .fp_proto = FIB_PROTOCOL_IP4,
366 /* If prefix already set on interface, just increment ref count & return */
367 if_prefix = ip_get_interface_prefix (lm, &key);
370 if_prefix->ref_count += 1;
374 /* New prefix - allocate a pool entry, initialize it, add to the hash */
375 pool_get (lm->if_prefix_pool, if_prefix);
376 if_prefix->ref_count = 1;
377 if_prefix->src_ia_index = a - lm->if_address_pool;
378 clib_memcpy (&if_prefix->key, &key, sizeof (key));
379 mhash_set (&lm->prefix_to_if_prefix_index, &key,
380 if_prefix - lm->if_prefix_pool, 0 /* old value */);
382 /* length <= 30 - add glean, drop first address, maybe drop bcast address */
383 if (a->address_length <= 30)
385 pfx_special.fp_len = a->address_length;
386 pfx_special.fp_addr.ip4.as_u32 = address->as_u32;
388 /* set the glean route for the prefix */
389 fib_table_entry_update_one_path (fib_index, &pfx_special,
390 FIB_SOURCE_INTERFACE,
391 (FIB_ENTRY_FLAG_CONNECTED |
392 FIB_ENTRY_FLAG_ATTACHED),
394 /* No next-hop address */
397 /* invalid FIB index */
400 /* no out-label stack */
402 FIB_ROUTE_PATH_FLAG_NONE);
404 /* set a drop route for the base address of the prefix */
405 pfx_special.fp_len = 32;
406 pfx_special.fp_addr.ip4.as_u32 =
407 address->as_u32 & im->fib_masks[a->address_length];
409 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
410 fib_table_entry_special_add (fib_index, &pfx_special,
411 FIB_SOURCE_INTERFACE,
412 (FIB_ENTRY_FLAG_DROP |
413 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
415 /* set a route for the broadcast address of the prefix */
416 pfx_special.fp_len = 32;
417 pfx_special.fp_addr.ip4.as_u32 =
418 address->as_u32 | ~im->fib_masks[a->address_length];
419 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
420 ip4_add_subnet_bcast_route (fib_index, &pfx_special, sw_if_index);
424 /* length == 31 - add an attached route for the other address */
425 else if (a->address_length == 31)
427 pfx_special.fp_len = 32;
428 pfx_special.fp_addr.ip4.as_u32 =
429 address->as_u32 ^ clib_host_to_net_u32(1);
431 fib_table_entry_update_one_path (fib_index, &pfx_special,
432 FIB_SOURCE_INTERFACE,
433 (FIB_ENTRY_FLAG_ATTACHED),
435 &pfx_special.fp_addr,
437 /* invalid FIB index */
441 FIB_ROUTE_PATH_FLAG_NONE);
446 ip4_add_interface_routes (u32 sw_if_index,
447 ip4_main_t * im, u32 fib_index,
448 ip_interface_address_t * a)
450 ip_lookup_main_t *lm = &im->lookup_main;
451 ip4_address_t *address = ip_interface_address_get_address (lm, a);
454 .fp_proto = FIB_PROTOCOL_IP4,
455 .fp_addr.ip4 = *address,
458 /* set special routes for the prefix if needed */
459 ip4_add_interface_prefix_routes (im, sw_if_index, fib_index, a);
461 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
463 u32 classify_table_index =
464 lm->classify_table_index_by_sw_if_index[sw_if_index];
465 if (classify_table_index != (u32) ~ 0)
467 dpo_id_t dpo = DPO_INVALID;
472 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
474 fib_table_entry_special_dpo_add (fib_index,
477 FIB_ENTRY_FLAG_NONE, &dpo);
482 fib_table_entry_update_one_path (fib_index, &pfx,
483 FIB_SOURCE_INTERFACE,
484 (FIB_ENTRY_FLAG_CONNECTED |
485 FIB_ENTRY_FLAG_LOCAL),
492 FIB_ROUTE_PATH_FLAG_NONE);
496 ip4_del_interface_prefix_routes (ip4_main_t * im,
499 ip4_address_t * address,
502 ip_lookup_main_t *lm = &im->lookup_main;
503 ip_interface_prefix_t *if_prefix;
505 ip_interface_prefix_key_t key = {
507 .fp_len = address_length,
508 .fp_proto = FIB_PROTOCOL_IP4,
509 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[address_length],
511 .sw_if_index = sw_if_index,
514 fib_prefix_t pfx_special = {
516 .fp_proto = FIB_PROTOCOL_IP4,
519 if_prefix = ip_get_interface_prefix (lm, &key);
522 clib_warning ("Prefix not found while deleting %U",
523 format_ip4_address_and_length, address, address_length);
527 if_prefix->ref_count -= 1;
530 * Routes need to be adjusted if:
531 * - deleting last intf addr in prefix
532 * - deleting intf addr used as default source address in glean adjacency
534 * We're done now otherwise
536 if ((if_prefix->ref_count > 0) &&
537 !pool_is_free_index (lm->if_address_pool, if_prefix->src_ia_index))
540 /* length <= 30, delete glean route, first address, last address */
541 if (address_length <= 30)
544 /* remove glean route for prefix */
545 pfx_special.fp_addr.ip4 = *address;
546 pfx_special.fp_len = address_length;
547 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
549 /* if no more intf addresses in prefix, remove other special routes */
550 if (!if_prefix->ref_count)
552 /* first address in prefix */
553 pfx_special.fp_addr.ip4.as_u32 =
554 address->as_u32 & im->fib_masks[address_length];
555 pfx_special.fp_len = 32;
557 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
558 fib_table_entry_special_remove (fib_index,
560 FIB_SOURCE_INTERFACE);
562 /* prefix broadcast address */
563 pfx_special.fp_addr.ip4.as_u32 =
564 address->as_u32 | ~im->fib_masks[address_length];
565 pfx_special.fp_len = 32;
567 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
568 fib_table_entry_special_remove (fib_index,
570 FIB_SOURCE_INTERFACE);
573 /* default source addr just got deleted, find another */
575 ip_interface_address_t *new_src_ia = NULL;
576 ip4_address_t *new_src_addr = NULL;
579 ip4_interface_address_matching_destination
580 (im, address, sw_if_index, &new_src_ia);
582 if_prefix->src_ia_index = new_src_ia - lm->if_address_pool;
584 pfx_special.fp_len = address_length;
585 pfx_special.fp_addr.ip4 = *new_src_addr;
587 /* set new glean route for the prefix */
588 fib_table_entry_update_one_path (fib_index, &pfx_special,
589 FIB_SOURCE_INTERFACE,
590 (FIB_ENTRY_FLAG_CONNECTED |
591 FIB_ENTRY_FLAG_ATTACHED),
593 /* No next-hop address */
596 /* invalid FIB index */
599 /* no out-label stack */
601 FIB_ROUTE_PATH_FLAG_NONE);
605 /* length == 31, delete attached route for the other address */
606 else if (address_length == 31)
608 pfx_special.fp_addr.ip4.as_u32 =
609 address->as_u32 ^ clib_host_to_net_u32(1);
611 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
614 mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */);
615 pool_put (lm->if_prefix_pool, if_prefix);
619 ip4_del_interface_routes (u32 sw_if_index,
622 ip4_address_t * address, u32 address_length)
625 .fp_len = address_length,
626 .fp_proto = FIB_PROTOCOL_IP4,
627 .fp_addr.ip4 = *address,
630 ip4_del_interface_prefix_routes (im, sw_if_index, fib_index,
631 address, address_length);
634 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
637 #ifndef CLIB_MARCH_VARIANT
639 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
641 ip4_main_t *im = &ip4_main;
643 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
646 * enable/disable only on the 1<->0 transition
650 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
655 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
656 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
659 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
663 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
664 sw_if_index, !is_enable, 0, 0);
667 ip4_enable_disable_interface_callback_t *cb;
668 vec_foreach (cb, im->enable_disable_interface_callbacks)
669 cb->function (im, cb->function_opaque, sw_if_index, is_enable);
673 static clib_error_t *
674 ip4_add_del_interface_address_internal (vlib_main_t * vm,
676 ip4_address_t * address,
677 u32 address_length, u32 is_del)
679 vnet_main_t *vnm = vnet_get_main ();
680 ip4_main_t *im = &ip4_main;
681 ip_lookup_main_t *lm = &im->lookup_main;
682 clib_error_t *error = 0;
683 u32 if_address_index, elts_before;
684 ip4_address_fib_t ip4_af, *addr_fib = 0;
686 /* local0 interface doesn't support IP addressing */
687 if (sw_if_index == 0)
690 clib_error_create ("local0 interface doesn't support IP addressing");
693 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
694 ip4_addr_fib_init (&ip4_af, address,
695 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
696 vec_add1 (addr_fib, ip4_af);
699 * there is no support for adj-fib handling in the presence of overlapping
700 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
706 /* When adding an address check that it does not conflict
707 with an existing address on any interface in this table. */
708 ip_interface_address_t *ia;
709 vnet_sw_interface_t *sif;
711 pool_foreach(sif, vnm->interface_main.sw_interfaces,
713 if (im->fib_index_by_sw_if_index[sw_if_index] ==
714 im->fib_index_by_sw_if_index[sif->sw_if_index])
716 foreach_ip_interface_address
717 (&im->lookup_main, ia, sif->sw_if_index,
718 0 /* honor unnumbered */ ,
721 ip_interface_address_get_address
722 (&im->lookup_main, ia);
723 if (ip4_destination_matches_route
724 (im, address, x, ia->address_length) ||
725 ip4_destination_matches_route (im,
730 /* an intf may have >1 addr from the same prefix */
731 if ((sw_if_index == sif->sw_if_index) &&
732 (ia->address_length == address_length) &&
733 (x->as_u32 != address->as_u32))
736 /* error if the length or intf was different */
737 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
741 ("failed to add %U on %U which conflicts with %U for interface %U",
742 format_ip4_address_and_length, address,
744 format_vnet_sw_if_index_name, vnm,
746 format_ip4_address_and_length, x,
748 format_vnet_sw_if_index_name, vnm,
757 elts_before = pool_elts (lm->if_address_pool);
759 error = ip_interface_address_add_del
760 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
764 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
765 ip4_mfib_interface_enable_disable (sw_if_index, !is_del);
767 /* intf addr routes are added/deleted on admin up/down */
768 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
771 ip4_del_interface_routes (sw_if_index,
772 im, ip4_af.fib_index, address,
775 ip4_add_interface_routes (sw_if_index,
776 im, ip4_af.fib_index,
778 (lm->if_address_pool, if_address_index));
781 /* If pool did not grow/shrink: add duplicate address. */
782 if (elts_before != pool_elts (lm->if_address_pool))
784 ip4_add_del_interface_address_callback_t *cb;
785 vec_foreach (cb, im->add_del_interface_address_callbacks)
786 cb->function (im, cb->function_opaque, sw_if_index,
787 address, address_length, if_address_index, is_del);
796 ip4_add_del_interface_address (vlib_main_t * vm,
798 ip4_address_t * address,
799 u32 address_length, u32 is_del)
801 return ip4_add_del_interface_address_internal
802 (vm, sw_if_index, address, address_length, is_del);
806 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
808 ip_interface_address_t *ia;
814 * when directed broadcast is enabled, the subnet braodcast route will forward
815 * packets using an adjacency with a broadcast MAC. otherwise it drops
818 foreach_ip_interface_address(&im->lookup_main, ia,
821 if (ia->address_length <= 30)
825 ipa = ip_interface_address_get_address (&im->lookup_main, ia);
829 .fp_proto = FIB_PROTOCOL_IP4,
831 .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
835 ip4_add_subnet_bcast_route
836 (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
845 static clib_error_t *
846 ip4_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
848 ip4_main_t *im = &ip4_main;
849 ip_interface_address_t *ia;
851 u32 is_admin_up, fib_index;
853 /* Fill in lookup tables with default table (0). */
854 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
856 vec_validate_init_empty (im->
857 lookup_main.if_address_pool_index_by_sw_if_index,
860 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
862 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
865 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
866 0 /* honor unnumbered */,
868 a = ip_interface_address_get_address (&im->lookup_main, ia);
870 ip4_add_interface_routes (sw_if_index,
874 ip4_del_interface_routes (sw_if_index,
876 a, ia->address_length);
883 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
885 /* Built-in ip4 unicast rx feature path definition */
887 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
889 .arc_name = "ip4-unicast",
890 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
891 .last_in_arc = "ip4-lookup",
892 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
895 VNET_FEATURE_INIT (ip4_flow_classify, static) =
897 .arc_name = "ip4-unicast",
898 .node_name = "ip4-flow-classify",
899 .runs_before = VNET_FEATURES ("ip4-inacl"),
902 VNET_FEATURE_INIT (ip4_inacl, static) =
904 .arc_name = "ip4-unicast",
905 .node_name = "ip4-inacl",
906 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
909 VNET_FEATURE_INIT (ip4_source_check_1, static) =
911 .arc_name = "ip4-unicast",
912 .node_name = "ip4-source-check-via-rx",
913 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
916 VNET_FEATURE_INIT (ip4_source_check_2, static) =
918 .arc_name = "ip4-unicast",
919 .node_name = "ip4-source-check-via-any",
920 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
923 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
925 .arc_name = "ip4-unicast",
926 .node_name = "ip4-source-and-port-range-check-rx",
927 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
930 VNET_FEATURE_INIT (ip4_policer_classify, static) =
932 .arc_name = "ip4-unicast",
933 .node_name = "ip4-policer-classify",
934 .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
937 VNET_FEATURE_INIT (ip4_ipsec, static) =
939 .arc_name = "ip4-unicast",
940 .node_name = "ipsec4-input-feature",
941 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
944 VNET_FEATURE_INIT (ip4_vpath, static) =
946 .arc_name = "ip4-unicast",
947 .node_name = "vpath-input-ip4",
948 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
951 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
953 .arc_name = "ip4-unicast",
954 .node_name = "ip4-vxlan-bypass",
955 .runs_before = VNET_FEATURES ("ip4-lookup"),
958 VNET_FEATURE_INIT (ip4_not_enabled, static) =
960 .arc_name = "ip4-unicast",
961 .node_name = "ip4-not-enabled",
962 .runs_before = VNET_FEATURES ("ip4-lookup"),
965 VNET_FEATURE_INIT (ip4_lookup, static) =
967 .arc_name = "ip4-unicast",
968 .node_name = "ip4-lookup",
969 .runs_before = 0, /* not before any other features */
972 /* Built-in ip4 multicast rx feature path definition */
973 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
975 .arc_name = "ip4-multicast",
976 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
977 .last_in_arc = "ip4-mfib-forward-lookup",
978 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
981 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
983 .arc_name = "ip4-multicast",
984 .node_name = "vpath-input-ip4",
985 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
988 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
990 .arc_name = "ip4-multicast",
991 .node_name = "ip4-not-enabled",
992 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
995 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
997 .arc_name = "ip4-multicast",
998 .node_name = "ip4-mfib-forward-lookup",
999 .runs_before = 0, /* last feature */
1002 /* Source and port-range check ip4 tx feature path definition */
1003 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1005 .arc_name = "ip4-output",
1006 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
1007 .last_in_arc = "interface-output",
1008 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1011 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1013 .arc_name = "ip4-output",
1014 .node_name = "ip4-source-and-port-range-check-tx",
1015 .runs_before = VNET_FEATURES ("ip4-outacl"),
1018 VNET_FEATURE_INIT (ip4_outacl, static) =
1020 .arc_name = "ip4-output",
1021 .node_name = "ip4-outacl",
1022 .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
1025 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1027 .arc_name = "ip4-output",
1028 .node_name = "ipsec4-output-feature",
1029 .runs_before = VNET_FEATURES ("interface-output"),
1032 /* Built-in ip4 tx feature path definition */
1033 VNET_FEATURE_INIT (ip4_interface_output, static) =
1035 .arc_name = "ip4-output",
1036 .node_name = "interface-output",
1037 .runs_before = 0, /* not before any other features */
1041 static clib_error_t *
1042 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1044 ip4_main_t *im = &ip4_main;
1046 /* Fill in lookup tables with default table (0). */
1047 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1048 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1052 ip4_main_t *im4 = &ip4_main;
1053 ip_lookup_main_t *lm4 = &im4->lookup_main;
1054 ip_interface_address_t *ia = 0;
1055 ip4_address_t *address;
1056 vlib_main_t *vm = vlib_get_main ();
1058 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
1060 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
1062 address = ip_interface_address_get_address (lm4, ia);
1063 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1066 ip4_mfib_interface_enable_disable (sw_if_index, 0);
1069 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
1072 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
1073 sw_if_index, is_add, 0, 0);
1075 return /* no error */ 0;
1078 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1080 /* Global IP4 main. */
1081 #ifndef CLIB_MARCH_VARIANT
1082 ip4_main_t ip4_main;
1083 #endif /* CLIB_MARCH_VARIANT */
1085 static clib_error_t *
1086 ip4_lookup_init (vlib_main_t * vm)
1088 ip4_main_t *im = &ip4_main;
1089 clib_error_t *error;
1092 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1094 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
1096 if ((error = vlib_call_init_function (vm, fib_module_init)))
1098 if ((error = vlib_call_init_function (vm, mfib_module_init)))
1101 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1106 m = pow2_mask (i) << (32 - i);
1109 im->fib_masks[i] = clib_host_to_net_u32 (m);
1112 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1114 /* Create FIB with index 0 and table id of 0. */
1115 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1116 FIB_SOURCE_DEFAULT_ROUTE);
1117 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1118 MFIB_SOURCE_DEFAULT_ROUTE);
1122 pn = pg_get_node (ip4_lookup_node.index);
1123 pn->unformat_edit = unformat_pg_ip4_header;
1127 ethernet_arp_header_t h;
1129 clib_memset (&h, 0, sizeof (h));
1131 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1132 #define _8(f,v) h.f = v;
1133 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1134 _16 (l3_type, ETHERNET_TYPE_IP4);
1135 _8 (n_l2_address_bytes, 6);
1136 _8 (n_l3_address_bytes, 4);
1137 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1141 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1144 /* alloc chunk size */ 8,
1151 VLIB_INIT_FUNCTION (ip4_lookup_init);
1155 /* Adjacency taken. */
1160 /* Packet data, possibly *after* rewrite. */
1161 u8 packet_data[64 - 1 * sizeof (u32)];
1163 ip4_forward_next_trace_t;
1165 #ifndef CLIB_MARCH_VARIANT
1167 format_ip4_forward_next_trace (u8 * s, va_list * args)
1169 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1170 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1171 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1172 u32 indent = format_get_indent (s);
1173 s = format (s, "%U%U",
1174 format_white_space, indent,
1175 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1181 format_ip4_lookup_trace (u8 * s, va_list * args)
1183 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1184 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1185 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1186 u32 indent = format_get_indent (s);
1188 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1189 t->fib_index, t->dpo_index, t->flow_hash);
1190 s = format (s, "\n%U%U",
1191 format_white_space, indent,
1192 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1197 format_ip4_rewrite_trace (u8 * s, va_list * args)
1199 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1200 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1201 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1202 u32 indent = format_get_indent (s);
1204 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1205 t->fib_index, t->dpo_index, format_ip_adjacency,
1206 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1207 s = format (s, "\n%U%U",
1208 format_white_space, indent,
1209 format_ip_adjacency_packet_data,
1210 t->packet_data, sizeof (t->packet_data));
1214 #ifndef CLIB_MARCH_VARIANT
1215 /* Common trace function for all ip4-forward next nodes. */
1217 ip4_forward_next_trace (vlib_main_t * vm,
1218 vlib_node_runtime_t * node,
1219 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1222 ip4_main_t *im = &ip4_main;
1224 n_left = frame->n_vectors;
1225 from = vlib_frame_vector_args (frame);
1230 vlib_buffer_t *b0, *b1;
1231 ip4_forward_next_trace_t *t0, *t1;
1233 /* Prefetch next iteration. */
1234 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1235 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1240 b0 = vlib_get_buffer (vm, bi0);
1241 b1 = vlib_get_buffer (vm, bi1);
1243 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1245 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1246 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1247 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1249 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1250 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1251 vec_elt (im->fib_index_by_sw_if_index,
1252 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1254 clib_memcpy_fast (t0->packet_data,
1255 vlib_buffer_get_current (b0),
1256 sizeof (t0->packet_data));
1258 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1260 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1261 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1262 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1264 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1265 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1266 vec_elt (im->fib_index_by_sw_if_index,
1267 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1268 clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1269 sizeof (t1->packet_data));
1279 ip4_forward_next_trace_t *t0;
1283 b0 = vlib_get_buffer (vm, bi0);
1285 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1287 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1288 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1289 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1291 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1292 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1293 vec_elt (im->fib_index_by_sw_if_index,
1294 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1295 clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1296 sizeof (t0->packet_data));
1303 /* Compute TCP/UDP/ICMP4 checksum in software. */
1305 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1309 u32 ip_header_length, payload_length_host_byte_order;
1311 /* Initialize checksum with ip header. */
1312 ip_header_length = ip4_header_bytes (ip0);
1313 payload_length_host_byte_order =
1314 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1316 clib_host_to_net_u32 (payload_length_host_byte_order +
1317 (ip0->protocol << 16));
1319 if (BITS (uword) == 32)
1322 ip_csum_with_carry (sum0,
1323 clib_mem_unaligned (&ip0->src_address, u32));
1325 ip_csum_with_carry (sum0,
1326 clib_mem_unaligned (&ip0->dst_address, u32));
1330 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1332 return ip_calculate_l4_checksum (vm, p0, sum0,
1333 payload_length_host_byte_order, (u8 *) ip0,
1334 ip_header_length, NULL);
1338 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1340 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1344 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1345 || ip0->protocol == IP_PROTOCOL_UDP);
1347 udp0 = (void *) (ip0 + 1);
1348 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1350 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1351 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1355 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1357 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1358 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1365 VNET_FEATURE_ARC_INIT (ip4_local) =
1367 .arc_name = "ip4-local",
1368 .start_nodes = VNET_FEATURES ("ip4-local"),
1369 .last_in_arc = "ip4-local-end-of-arc",
1374 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1375 ip4_header_t * ip, u8 is_udp, u8 * error,
1379 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1380 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1384 u32 ip_len, udp_len;
1386 udp = ip4_next_header (ip);
1387 /* Verify UDP length. */
1388 ip_len = clib_net_to_host_u16 (ip->length);
1389 udp_len = clib_net_to_host_u16 (udp->length);
1391 len_diff = ip_len - udp_len;
1392 *good_tcp_udp &= len_diff >= 0;
1393 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1397 #define ip4_local_csum_is_offloaded(_b) \
1398 _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \
1399 || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1401 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1402 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1403 || ip4_local_csum_is_offloaded (_b)))
1405 #define ip4_local_csum_is_valid(_b) \
1406 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1407 || (ip4_local_csum_is_offloaded (_b))) != 0
1410 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1411 ip4_header_t * ih, u8 * error)
1413 u8 is_udp, is_tcp_udp, good_tcp_udp;
1415 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1416 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1418 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1419 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1421 good_tcp_udp = ip4_local_csum_is_valid (b);
1423 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1424 *error = (is_tcp_udp && !good_tcp_udp
1425 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1429 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1430 ip4_header_t ** ih, u8 * error)
1432 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1434 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1435 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1437 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1438 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1440 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1441 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1443 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1444 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1447 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1450 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1454 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1455 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1456 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1457 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1461 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1462 vlib_buffer_t * b, u16 * next, u8 error,
1463 u8 head_of_feature_arc)
1465 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1468 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1469 b->error = error ? error_node->errors[error] : 0;
1470 if (head_of_feature_arc)
1473 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1475 vnet_feature_arc_start (arc_index,
1476 vnet_buffer (b)->sw_if_index[VLIB_RX],
1489 } ip4_local_last_check_t;
1492 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1493 ip4_local_last_check_t * last_check, u8 * error0)
1495 ip4_fib_mtrie_leaf_t leaf0;
1496 ip4_fib_mtrie_t *mtrie0;
1497 const dpo_id_t *dpo0;
1498 load_balance_t *lb0;
1501 vnet_buffer (b)->ip.fib_index =
1502 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1503 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1506 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1507 * adjacency for the destination address (the local interface address).
1508 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1509 * adjacency for the source address (the remote sender's address)
1511 if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) ||
1514 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1515 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1516 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1517 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1518 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1520 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1521 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1522 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1524 lb0 = load_balance_get (lbi0);
1525 dpo0 = load_balance_get_bucket_i (lb0, 0);
1528 * Must have a route to source otherwise we drop the packet.
1529 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1532 * - the source is a recieve => it's from us => bogus, do this
1533 * first since it sets a different error code.
1534 * - uRPF check for any route to source - accept if passes.
1535 * - allow packets destined to the broadcast address from unknown sources
1538 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1539 && dpo0->dpoi_type == DPO_RECEIVE) ?
1540 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1541 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1542 && !fib_urpf_check_size (lb0->lb_urpf)
1543 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1544 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1546 last_check->src.as_u32 = ip0->src_address.as_u32;
1547 last_check->lbi = lbi0;
1548 last_check->error = *error0;
1549 last_check->first = 0;
1553 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1554 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1555 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1556 *error0 = last_check->error;
1561 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1562 ip4_local_last_check_t * last_check, u8 * error)
1564 ip4_fib_mtrie_leaf_t leaf[2];
1565 ip4_fib_mtrie_t *mtrie[2];
1566 const dpo_id_t *dpo[2];
1567 load_balance_t *lb[2];
1571 not_last_hit = last_check->first;
1572 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1573 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1575 vnet_buffer (b[0])->ip.fib_index =
1576 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1577 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1578 vnet_buffer (b[0])->ip.fib_index;
1580 vnet_buffer (b[1])->ip.fib_index =
1581 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1582 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1583 vnet_buffer (b[1])->ip.fib_index;
1586 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1587 * adjacency for the destination address (the local interface address).
1588 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1589 * adjacency for the source address (the remote sender's address)
1591 if (PREDICT_TRUE (not_last_hit))
1593 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1594 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1596 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1597 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1599 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1600 &ip[0]->src_address, 2);
1601 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1602 &ip[1]->src_address, 2);
1604 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1605 &ip[0]->src_address, 3);
1606 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1607 &ip[1]->src_address, 3);
1609 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1610 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1612 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1613 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1614 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1616 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1617 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1618 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1620 lb[0] = load_balance_get (lbi[0]);
1621 lb[1] = load_balance_get (lbi[1]);
1623 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1624 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1626 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1627 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1628 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1629 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1630 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1631 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1632 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1634 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1635 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1636 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1637 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1638 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1639 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1640 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1642 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1643 last_check->lbi = lbi[1];
1644 last_check->error = error[1];
1645 last_check->first = 0;
1649 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1650 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1651 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1653 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1654 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1655 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1657 error[0] = last_check->error;
1658 error[1] = last_check->error;
1662 enum ip_local_packet_type_e
1664 IP_LOCAL_PACKET_TYPE_L4,
1665 IP_LOCAL_PACKET_TYPE_NAT,
1666 IP_LOCAL_PACKET_TYPE_FRAG,
1670 * Determine packet type and next node.
1672 * The expectation is that all packets that are not L4 will skip
1673 * checksums and source checks.
1676 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1678 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1680 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1682 *next = IP_LOCAL_NEXT_REASSEMBLY;
1683 return IP_LOCAL_PACKET_TYPE_FRAG;
1685 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1687 *next = lm->local_next_by_ip_protocol[ip->protocol];
1688 return IP_LOCAL_PACKET_TYPE_NAT;
1691 *next = lm->local_next_by_ip_protocol[ip->protocol];
1692 return IP_LOCAL_PACKET_TYPE_L4;
1696 ip4_local_inline (vlib_main_t * vm,
1697 vlib_node_runtime_t * node,
1698 vlib_frame_t * frame, int head_of_feature_arc)
1700 u32 *from, n_left_from;
1701 vlib_node_runtime_t *error_node =
1702 vlib_node_get_runtime (vm, ip4_local_node.index);
1703 u16 nexts[VLIB_FRAME_SIZE], *next;
1704 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1705 ip4_header_t *ip[2];
1708 ip4_local_last_check_t last_check = {
1710 * 0.0.0.0 can appear as the source address of an IP packet,
1711 * as can any other address, hence the need to use the 'first'
1712 * member to make sure the .lbi is initialised for the first
1715 .src = {.as_u32 = 0},
1717 .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1721 from = vlib_frame_vector_args (frame);
1722 n_left_from = frame->n_vectors;
1724 if (node->flags & VLIB_NODE_FLAG_TRACE)
1725 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1727 vlib_get_buffers (vm, from, bufs, n_left_from);
1731 while (n_left_from >= 6)
1735 /* Prefetch next iteration. */
1737 vlib_prefetch_buffer_header (b[4], LOAD);
1738 vlib_prefetch_buffer_header (b[5], LOAD);
1740 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1741 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1744 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1746 ip[0] = vlib_buffer_get_current (b[0]);
1747 ip[1] = vlib_buffer_get_current (b[1]);
1749 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1750 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1752 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1753 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1755 not_batch = pt[0] ^ pt[1];
1757 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1760 if (PREDICT_TRUE (not_batch == 0))
1762 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1763 ip4_local_check_src_x2 (b, ip, &last_check, error);
1769 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1770 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1774 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1775 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1781 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1782 head_of_feature_arc);
1783 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1784 head_of_feature_arc);
1791 while (n_left_from > 0)
1793 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1795 ip[0] = vlib_buffer_get_current (b[0]);
1796 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1797 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1799 if (head_of_feature_arc == 0 || pt[0])
1802 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1803 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1807 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1808 head_of_feature_arc);
1815 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1816 return frame->n_vectors;
1819 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1820 vlib_frame_t * frame)
1822 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1826 VLIB_REGISTER_NODE (ip4_local_node) =
1828 .name = "ip4-local",
1829 .vector_size = sizeof (u32),
1830 .format_trace = format_ip4_forward_next_trace,
1831 .n_errors = IP4_N_ERROR,
1832 .error_strings = ip4_error_strings,
1833 .n_next_nodes = IP_LOCAL_N_NEXT,
1836 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1837 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1838 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1839 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1840 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-full-reassembly",
1846 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1847 vlib_node_runtime_t * node,
1848 vlib_frame_t * frame)
1850 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1854 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1855 .name = "ip4-local-end-of-arc",
1856 .vector_size = sizeof (u32),
1858 .format_trace = format_ip4_forward_next_trace,
1859 .sibling_of = "ip4-local",
1862 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1863 .arc_name = "ip4-local",
1864 .node_name = "ip4-local-end-of-arc",
1865 .runs_before = 0, /* not before any other features */
1869 #ifndef CLIB_MARCH_VARIANT
1871 ip4_register_protocol (u32 protocol, u32 node_index)
1873 vlib_main_t *vm = vlib_get_main ();
1874 ip4_main_t *im = &ip4_main;
1875 ip_lookup_main_t *lm = &im->lookup_main;
1877 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1878 lm->local_next_by_ip_protocol[protocol] =
1879 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1883 ip4_unregister_protocol (u32 protocol)
1885 ip4_main_t *im = &ip4_main;
1886 ip_lookup_main_t *lm = &im->lookup_main;
1888 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1889 lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1893 static clib_error_t *
1894 show_ip_local_command_fn (vlib_main_t * vm,
1895 unformat_input_t * input, vlib_cli_command_t * cmd)
1897 ip4_main_t *im = &ip4_main;
1898 ip_lookup_main_t *lm = &im->lookup_main;
1901 vlib_cli_output (vm, "Protocols handled by ip4_local");
1902 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1904 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1906 u32 node_index = vlib_get_node (vm,
1907 ip4_local_node.index)->
1908 next_nodes[lm->local_next_by_ip_protocol[i]];
1909 vlib_cli_output (vm, "%U: %U", format_ip_protocol, i,
1910 format_vlib_node_name, vm, node_index);
1919 * Display the set of protocols handled by the local IPv4 stack.
1922 * Example of how to display local protocol table:
1923 * @cliexstart{show ip local}
1924 * Protocols handled by ip4_local
1931 VLIB_CLI_COMMAND (show_ip_local, static) =
1933 .path = "show ip local",
1934 .function = show_ip_local_command_fn,
1935 .short_help = "show ip local",
1941 IP4_REWRITE_NEXT_DROP,
1942 IP4_REWRITE_NEXT_ICMP_ERROR,
1943 IP4_REWRITE_NEXT_FRAGMENT,
1944 IP4_REWRITE_N_NEXT /* Last */
1945 } ip4_rewrite_next_t;
1948 * This bits of an IPv4 address to mask to construct a multicast
1951 #if CLIB_ARCH_IS_BIG_ENDIAN
1952 #define IP4_MCAST_ADDR_MASK 0x007fffff
1954 #define IP4_MCAST_ADDR_MASK 0xffff7f00
1958 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
1959 u16 adj_packet_bytes, bool df, u16 * next,
1960 u8 is_midchain, u32 * error)
1962 if (packet_len > adj_packet_bytes)
1964 *error = IP4_ERROR_MTU_EXCEEDED;
1967 icmp4_error_set_vnet_buffer
1968 (b, ICMP4_destination_unreachable,
1969 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
1971 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
1975 /* IP fragmentation */
1976 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1978 IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1979 IP_FRAG_NEXT_IP_REWRITE), 0);
1980 *next = IP4_REWRITE_NEXT_FRAGMENT;
1985 /* increment TTL & update checksum.
1986 Works either endian, so no need for byte swap. */
1987 static_always_inline void
1988 ip4_ttl_inc (vlib_buffer_t * b, ip4_header_t * ip)
1992 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
1997 checksum = ip->checksum - clib_host_to_net_u16 (0x0100);
1998 checksum += checksum >= 0xffff;
2000 ip->checksum = checksum;
2004 ASSERT (ip->checksum == ip4_header_checksum (ip));
2007 /* Decrement TTL & update checksum.
2008 Works either endian, so no need for byte swap. */
2009 static_always_inline void
2010 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2015 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2020 /* Input node should have reject packets with ttl 0. */
2021 ASSERT (ip->ttl > 0);
2023 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2024 checksum += checksum >= 0xffff;
2026 ip->checksum = checksum;
2031 * If the ttl drops below 1 when forwarding, generate
2034 if (PREDICT_FALSE (ttl <= 0))
2036 *error = IP4_ERROR_TIME_EXPIRED;
2037 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2038 icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2039 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2041 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2044 /* Verify checksum. */
2045 ASSERT ((ip->checksum == ip4_header_checksum (ip)) ||
2046 (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2051 ip4_rewrite_inline_with_gso (vlib_main_t * vm,
2052 vlib_node_runtime_t * node,
2053 vlib_frame_t * frame,
2054 int do_counters, int is_midchain, int is_mcast)
2056 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2057 u32 *from = vlib_frame_vector_args (frame);
2058 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2059 u16 nexts[VLIB_FRAME_SIZE], *next;
2061 vlib_node_runtime_t *error_node =
2062 vlib_node_get_runtime (vm, ip4_input_node.index);
2064 n_left_from = frame->n_vectors;
2065 u32 thread_index = vm->thread_index;
2067 vlib_get_buffers (vm, from, bufs, n_left_from);
2068 clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2070 #if (CLIB_N_PREFETCHES >= 8)
2071 if (n_left_from >= 6)
2074 for (i = 2; i < 6; i++)
2075 vlib_prefetch_buffer_header (bufs[i], LOAD);
2080 while (n_left_from >= 8)
2082 const ip_adjacency_t *adj0, *adj1;
2083 ip4_header_t *ip0, *ip1;
2084 u32 rw_len0, error0, adj_index0;
2085 u32 rw_len1, error1, adj_index1;
2086 u32 tx_sw_if_index0, tx_sw_if_index1;
2089 vlib_prefetch_buffer_header (b[6], LOAD);
2090 vlib_prefetch_buffer_header (b[7], LOAD);
2092 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2093 adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2096 * pre-fetch the per-adjacency counters
2100 vlib_prefetch_combined_counter (&adjacency_counters,
2101 thread_index, adj_index0);
2102 vlib_prefetch_combined_counter (&adjacency_counters,
2103 thread_index, adj_index1);
2106 ip0 = vlib_buffer_get_current (b[0]);
2107 ip1 = vlib_buffer_get_current (b[1]);
2109 error0 = error1 = IP4_ERROR_NONE;
2111 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2112 ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2114 /* Rewrite packet header and updates lengths. */
2115 adj0 = adj_get (adj_index0);
2116 adj1 = adj_get (adj_index1);
2118 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2119 rw_len0 = adj0[0].rewrite_header.data_bytes;
2120 rw_len1 = adj1[0].rewrite_header.data_bytes;
2121 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2122 vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2124 p = vlib_buffer_get_current (b[2]);
2125 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2126 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2128 p = vlib_buffer_get_current (b[3]);
2129 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2130 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2132 /* Check MTU of outgoing interface. */
2133 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2134 u16 ip1_len = clib_net_to_host_u16 (ip1->length);
2136 if (b[0]->flags & VNET_BUFFER_F_GSO)
2137 ip0_len = gso_mtu_sz (b[0]);
2138 if (b[1]->flags & VNET_BUFFER_F_GSO)
2139 ip1_len = gso_mtu_sz (b[1]);
2141 ip4_mtu_check (b[0], ip0_len,
2142 adj0[0].rewrite_header.max_l3_packet_bytes,
2143 ip0->flags_and_fragment_offset &
2144 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2145 next + 0, is_midchain, &error0);
2146 ip4_mtu_check (b[1], ip1_len,
2147 adj1[0].rewrite_header.max_l3_packet_bytes,
2148 ip1->flags_and_fragment_offset &
2149 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2150 next + 1, is_midchain, &error1);
2154 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2155 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2156 IP4_ERROR_SAME_INTERFACE : error0);
2157 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2158 vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2159 IP4_ERROR_SAME_INTERFACE : error1);
2162 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2163 * to see the IP header */
2164 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2166 u32 next_index = adj0[0].rewrite_header.next_index;
2167 vlib_buffer_advance (b[0], -(word) rw_len0);
2169 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2170 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2173 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2174 vnet_feature_arc_start (lm->output_feature_arc_index,
2175 tx_sw_if_index0, &next_index, b[0]);
2176 next[0] = next_index;
2178 calc_checksums (vm, b[0]);
2182 b[0]->error = error_node->errors[error0];
2183 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2184 ip4_ttl_inc (b[0], ip0);
2186 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2188 u32 next_index = adj1[0].rewrite_header.next_index;
2189 vlib_buffer_advance (b[1], -(word) rw_len1);
2191 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2192 vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2195 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2196 vnet_feature_arc_start (lm->output_feature_arc_index,
2197 tx_sw_if_index1, &next_index, b[1]);
2198 next[1] = next_index;
2200 calc_checksums (vm, b[1]);
2204 b[1]->error = error_node->errors[error1];
2205 if (error1 == IP4_ERROR_MTU_EXCEEDED)
2206 ip4_ttl_inc (b[1], ip1);
2209 /* Guess we are only writing on simple Ethernet header. */
2210 vnet_rewrite_two_headers (adj0[0], adj1[0],
2211 ip0, ip1, sizeof (ethernet_header_t));
2215 if (error0 == IP4_ERROR_NONE)
2216 vlib_increment_combined_counter
2217 (&adjacency_counters,
2220 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2222 if (error1 == IP4_ERROR_NONE)
2223 vlib_increment_combined_counter
2224 (&adjacency_counters,
2227 vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2232 if (error0 == IP4_ERROR_NONE && adj0->sub_type.midchain.fixup_func)
2233 adj0->sub_type.midchain.fixup_func
2234 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2235 if (error1 == IP4_ERROR_NONE && adj1->sub_type.midchain.fixup_func)
2236 adj1->sub_type.midchain.fixup_func
2237 (vm, adj1, b[1], adj1->sub_type.midchain.fixup_data);
2242 /* copy bytes from the IP address into the MAC rewrite */
2243 if (error0 == IP4_ERROR_NONE)
2244 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2245 adj0->rewrite_header.dst_mcast_offset,
2246 &ip0->dst_address.as_u32, (u8 *) ip0);
2247 if (error1 == IP4_ERROR_NONE)
2248 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2249 adj1->rewrite_header.dst_mcast_offset,
2250 &ip1->dst_address.as_u32, (u8 *) ip1);
2257 #elif (CLIB_N_PREFETCHES >= 4)
2260 while (n_left_from >= 1)
2262 ip_adjacency_t *adj0;
2264 u32 rw_len0, error0, adj_index0;
2265 u32 tx_sw_if_index0;
2268 /* Prefetch next iteration */
2269 if (PREDICT_TRUE (n_left_from >= 4))
2271 ip_adjacency_t *adj2;
2274 vlib_prefetch_buffer_header (b[3], LOAD);
2275 vlib_prefetch_buffer_data (b[2], LOAD);
2277 /* Prefetch adj->rewrite_header */
2278 adj_index2 = vnet_buffer (b[2])->ip.adj_index[VLIB_TX];
2279 adj2 = adj_get (adj_index2);
2281 CLIB_PREFETCH (p + CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES,
2285 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2288 * Prefetch the per-adjacency counters
2292 vlib_prefetch_combined_counter (&adjacency_counters,
2293 thread_index, adj_index0);
2296 ip0 = vlib_buffer_get_current (b[0]);
2298 error0 = IP4_ERROR_NONE;
2300 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2302 /* Rewrite packet header and updates lengths. */
2303 adj0 = adj_get (adj_index0);
2305 /* Rewrite header was prefetched. */
2306 rw_len0 = adj0[0].rewrite_header.data_bytes;
2307 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2309 /* Check MTU of outgoing interface. */
2310 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2312 if (b[0]->flags & VNET_BUFFER_F_GSO)
2313 ip0_len = gso_mtu_sz (b[0]);
2315 ip4_mtu_check (b[0], ip0_len,
2316 adj0[0].rewrite_header.max_l3_packet_bytes,
2317 ip0->flags_and_fragment_offset &
2318 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2319 next + 0, is_midchain, &error0);
2323 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2324 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2325 IP4_ERROR_SAME_INTERFACE : error0);
2328 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2329 * to see the IP header */
2330 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2332 u32 next_index = adj0[0].rewrite_header.next_index;
2333 vlib_buffer_advance (b[0], -(word) rw_len0);
2334 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2335 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2338 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2339 vnet_feature_arc_start (lm->output_feature_arc_index,
2340 tx_sw_if_index0, &next_index, b[0]);
2341 next[0] = next_index;
2344 calc_checksums (vm, b[0]);
2346 /* Guess we are only writing on simple Ethernet header. */
2347 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2350 * Bump the per-adjacency counters
2353 vlib_increment_combined_counter
2354 (&adjacency_counters,
2356 adj_index0, 1, vlib_buffer_length_in_chain (vm,
2359 if (is_midchain && adj0->sub_type.midchain.fixup_func)
2360 adj0->sub_type.midchain.fixup_func
2361 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2364 /* copy bytes from the IP address into the MAC rewrite */
2365 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2366 adj0->rewrite_header.dst_mcast_offset,
2367 &ip0->dst_address.as_u32, (u8 *) ip0);
2371 b[0]->error = error_node->errors[error0];
2372 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2373 ip4_ttl_inc (b[0], ip0);
2382 while (n_left_from > 0)
2384 ip_adjacency_t *adj0;
2386 u32 rw_len0, adj_index0, error0;
2387 u32 tx_sw_if_index0;
2389 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2391 adj0 = adj_get (adj_index0);
2394 vlib_prefetch_combined_counter (&adjacency_counters,
2395 thread_index, adj_index0);
2397 ip0 = vlib_buffer_get_current (b[0]);
2399 error0 = IP4_ERROR_NONE;
2401 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2404 /* Update packet buffer attributes/set output interface. */
2405 rw_len0 = adj0[0].rewrite_header.data_bytes;
2406 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2408 /* Check MTU of outgoing interface. */
2409 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2410 if (b[0]->flags & VNET_BUFFER_F_GSO)
2411 ip0_len = gso_mtu_sz (b[0]);
2413 ip4_mtu_check (b[0], ip0_len,
2414 adj0[0].rewrite_header.max_l3_packet_bytes,
2415 ip0->flags_and_fragment_offset &
2416 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2417 next + 0, is_midchain, &error0);
2421 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2422 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2423 IP4_ERROR_SAME_INTERFACE : error0);
2426 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2427 * to see the IP header */
2428 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2430 u32 next_index = adj0[0].rewrite_header.next_index;
2431 vlib_buffer_advance (b[0], -(word) rw_len0);
2432 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2433 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2436 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2437 vnet_feature_arc_start (lm->output_feature_arc_index,
2438 tx_sw_if_index0, &next_index, b[0]);
2439 next[0] = next_index;
2442 /* this acts on the packet that is about to be encapped */
2443 calc_checksums (vm, b[0]);
2445 /* Guess we are only writing on simple Ethernet header. */
2446 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2449 vlib_increment_combined_counter
2450 (&adjacency_counters,
2451 thread_index, adj_index0, 1,
2452 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2454 if (is_midchain && adj0->sub_type.midchain.fixup_func)
2455 adj0->sub_type.midchain.fixup_func
2456 (vm, adj0, b[0], adj0->sub_type.midchain.fixup_data);
2459 /* copy bytes from the IP address into the MAC rewrite */
2460 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2461 adj0->rewrite_header.dst_mcast_offset,
2462 &ip0->dst_address.as_u32, (u8 *) ip0);
2466 b[0]->error = error_node->errors[error0];
2467 /* undo the TTL decrement - we'll be back to do it again */
2468 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2469 ip4_ttl_inc (b[0], ip0);
2478 /* Need to do trace after rewrites to pick up new packet data. */
2479 if (node->flags & VLIB_NODE_FLAG_TRACE)
2480 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2482 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2483 return frame->n_vectors;
2487 ip4_rewrite_inline (vlib_main_t * vm,
2488 vlib_node_runtime_t * node,
2489 vlib_frame_t * frame,
2490 int do_counters, int is_midchain, int is_mcast)
2492 return ip4_rewrite_inline_with_gso (vm, node, frame, do_counters,
2493 is_midchain, is_mcast);
2497 /** @brief IPv4 rewrite node.
2500 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2501 header checksum, fetch the ip adjacency, check the outbound mtu,
2502 apply the adjacency rewrite, and send pkts to the adjacency
2503 rewrite header's rewrite_next_index.
2505 @param vm vlib_main_t corresponding to the current thread
2506 @param node vlib_node_runtime_t
2507 @param frame vlib_frame_t whose contents should be dispatched
2509 @par Graph mechanics: buffer metadata, next index usage
2512 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2513 - the rewrite adjacency index
2514 - <code>adj->lookup_next_index</code>
2515 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2516 the packet will be dropped.
2517 - <code>adj->rewrite_header</code>
2518 - Rewrite string length, rewrite string, next_index
2521 - <code>b->current_data, b->current_length</code>
2522 - Updated net of applying the rewrite string
2524 <em>Next Indices:</em>
2525 - <code> adj->rewrite_header.next_index </code>
2529 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2530 vlib_frame_t * frame)
2532 if (adj_are_counters_enabled ())
2533 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2535 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2538 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2539 vlib_node_runtime_t * node,
2540 vlib_frame_t * frame)
2542 if (adj_are_counters_enabled ())
2543 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2545 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2548 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2549 vlib_node_runtime_t * node,
2550 vlib_frame_t * frame)
2552 if (adj_are_counters_enabled ())
2553 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2555 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2558 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2559 vlib_node_runtime_t * node,
2560 vlib_frame_t * frame)
2562 if (adj_are_counters_enabled ())
2563 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2565 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2568 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2569 vlib_node_runtime_t * node,
2570 vlib_frame_t * frame)
2572 if (adj_are_counters_enabled ())
2573 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2575 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2579 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2580 .name = "ip4-rewrite",
2581 .vector_size = sizeof (u32),
2583 .format_trace = format_ip4_rewrite_trace,
2585 .n_next_nodes = IP4_REWRITE_N_NEXT,
2587 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2588 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2589 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2593 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2594 .name = "ip4-rewrite-bcast",
2595 .vector_size = sizeof (u32),
2597 .format_trace = format_ip4_rewrite_trace,
2598 .sibling_of = "ip4-rewrite",
2601 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2602 .name = "ip4-rewrite-mcast",
2603 .vector_size = sizeof (u32),
2605 .format_trace = format_ip4_rewrite_trace,
2606 .sibling_of = "ip4-rewrite",
2609 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2610 .name = "ip4-mcast-midchain",
2611 .vector_size = sizeof (u32),
2613 .format_trace = format_ip4_rewrite_trace,
2614 .sibling_of = "ip4-rewrite",
2617 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2618 .name = "ip4-midchain",
2619 .vector_size = sizeof (u32),
2620 .format_trace = format_ip4_rewrite_trace,
2621 .sibling_of = "ip4-rewrite",
2626 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2628 ip4_fib_mtrie_t *mtrie0;
2629 ip4_fib_mtrie_leaf_t leaf0;
2632 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2634 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2635 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2636 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2638 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2640 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2643 static clib_error_t *
2644 test_lookup_command_fn (vlib_main_t * vm,
2645 unformat_input_t * input, vlib_cli_command_t * cmd)
2652 ip4_address_t ip4_base_address;
2655 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2657 if (unformat (input, "table %d", &table_id))
2659 /* Make sure the entry exists. */
2660 fib = ip4_fib_get (table_id);
2661 if ((fib) && (fib->index != table_id))
2662 return clib_error_return (0, "<fib-index> %d does not exist",
2665 else if (unformat (input, "count %f", &count))
2668 else if (unformat (input, "%U",
2669 unformat_ip4_address, &ip4_base_address))
2672 return clib_error_return (0, "unknown input `%U'",
2673 format_unformat_error, input);
2678 for (i = 0; i < n; i++)
2680 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2683 ip4_base_address.as_u32 =
2684 clib_host_to_net_u32 (1 +
2685 clib_net_to_host_u32 (ip4_base_address.as_u32));
2689 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2691 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2697 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2698 * given FIB table to determine if there is a conflict with the
2699 * adjacency table. The fib-id can be determined by using the
2700 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2703 * @todo This command uses fib-id, other commands use table-id (not
2704 * just a name, they are different indexes). Would like to change this
2705 * to table-id for consistency.
2708 * Example of how to run the test lookup command:
2709 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2710 * No errors in 2 lookups
2714 VLIB_CLI_COMMAND (lookup_test_command, static) =
2716 .path = "test lookup",
2717 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2718 .function = test_lookup_command_fn,
2722 #ifndef CLIB_MARCH_VARIANT
2724 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2728 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2730 if (~0 == fib_index)
2731 return VNET_API_ERROR_NO_SUCH_FIB;
2733 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2740 static clib_error_t *
2741 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2742 unformat_input_t * input,
2743 vlib_cli_command_t * cmd)
2747 u32 flow_hash_config = 0;
2750 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2752 if (unformat (input, "table %d", &table_id))
2755 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2756 foreach_flow_hash_bit
2763 return clib_error_return (0, "unknown input `%U'",
2764 format_unformat_error, input);
2766 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2772 case VNET_API_ERROR_NO_SUCH_FIB:
2773 return clib_error_return (0, "no such FIB table %d", table_id);
2776 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2784 * Configure the set of IPv4 fields used by the flow hash.
2787 * Example of how to set the flow hash on a given table:
2788 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2789 * Example of display the configured flow hash:
2790 * @cliexstart{show ip fib}
2791 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2794 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2795 * [0] [@0]: dpo-drop ip6
2798 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2799 * [0] [@0]: dpo-drop ip6
2802 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2803 * [0] [@0]: dpo-drop ip6
2806 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2807 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2810 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2811 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2812 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2813 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2814 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2817 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2818 * [0] [@0]: dpo-drop ip6
2819 * 255.255.255.255/32
2821 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2822 * [0] [@0]: dpo-drop ip6
2823 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2826 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2827 * [0] [@0]: dpo-drop ip6
2830 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2831 * [0] [@0]: dpo-drop ip6
2834 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2835 * [0] [@4]: ipv4-glean: af_packet0
2838 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2839 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2842 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2843 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2846 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2847 * [0] [@4]: ipv4-glean: af_packet1
2850 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2851 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2854 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2855 * [0] [@0]: dpo-drop ip6
2858 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2859 * [0] [@0]: dpo-drop ip6
2860 * 255.255.255.255/32
2862 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2863 * [0] [@0]: dpo-drop ip6
2867 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2869 .path = "set ip flow-hash",
2871 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2872 .function = set_ip_flow_hash_command_fn,
2876 #ifndef CLIB_MARCH_VARIANT
2878 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2881 vnet_main_t *vnm = vnet_get_main ();
2882 vnet_interface_main_t *im = &vnm->interface_main;
2883 ip4_main_t *ipm = &ip4_main;
2884 ip_lookup_main_t *lm = &ipm->lookup_main;
2885 vnet_classify_main_t *cm = &vnet_classify_main;
2886 ip4_address_t *if_addr;
2888 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2889 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2891 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2892 return VNET_API_ERROR_NO_SUCH_ENTRY;
2894 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2895 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2897 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2899 if (NULL != if_addr)
2901 fib_prefix_t pfx = {
2903 .fp_proto = FIB_PROTOCOL_IP4,
2904 .fp_addr.ip4 = *if_addr,
2908 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2912 if (table_index != (u32) ~ 0)
2914 dpo_id_t dpo = DPO_INVALID;
2919 classify_dpo_create (DPO_PROTO_IP4, table_index));
2921 fib_table_entry_special_dpo_add (fib_index,
2923 FIB_SOURCE_CLASSIFY,
2924 FIB_ENTRY_FLAG_NONE, &dpo);
2929 fib_table_entry_special_remove (fib_index,
2930 &pfx, FIB_SOURCE_CLASSIFY);
2938 static clib_error_t *
2939 set_ip_classify_command_fn (vlib_main_t * vm,
2940 unformat_input_t * input,
2941 vlib_cli_command_t * cmd)
2943 u32 table_index = ~0;
2944 int table_index_set = 0;
2945 u32 sw_if_index = ~0;
2948 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2950 if (unformat (input, "table-index %d", &table_index))
2951 table_index_set = 1;
2952 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2953 vnet_get_main (), &sw_if_index))
2959 if (table_index_set == 0)
2960 return clib_error_return (0, "classify table-index must be specified");
2962 if (sw_if_index == ~0)
2963 return clib_error_return (0, "interface / subif must be specified");
2965 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2972 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2973 return clib_error_return (0, "No such interface");
2975 case VNET_API_ERROR_NO_SUCH_ENTRY:
2976 return clib_error_return (0, "No such classifier table");
2982 * Assign a classification table to an interface. The classification
2983 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2984 * commands. Once the table is create, use this command to filter packets
2988 * Example of how to assign a classification table to an interface:
2989 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2992 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2994 .path = "set ip classify",
2996 "set ip classify intfc <interface> table-index <classify-idx>",
2997 .function = set_ip_classify_command_fn,
3001 static clib_error_t *
3002 ip4_config (vlib_main_t * vm, unformat_input_t * input)
3004 ip4_main_t *im = &ip4_main;
3007 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3009 if (unformat (input, "heap-size %U", unformat_memory_size, &heapsize))
3012 return clib_error_return (0,
3013 "invalid heap-size parameter `%U'",
3014 format_unformat_error, input);
3017 im->mtrie_heap_size = heapsize;
3022 VLIB_EARLY_CONFIG_FUNCTION (ip4_config, "ip");
3025 * fd.io coding-style-patch-verification: ON
3028 * eval: (c-set-style "gnu")