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>
58 #include <vnet/interface_output.h>
60 /** @brief IPv4 lookup node.
63 This is the main IPv4 lookup dispatch node.
65 @param vm vlib_main_t corresponding to the current thread
66 @param node vlib_node_runtime_t
67 @param frame vlib_frame_t whose contents should be dispatched
69 @par Graph mechanics: buffer metadata, next index usage
72 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
73 - Indicates the @c sw_if_index value of the interface that the
74 packet was received on.
75 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
76 - When the value is @c ~0 then the node performs a longest prefix
77 match (LPM) for the packet destination address in the FIB attached
78 to the receive interface.
79 - Otherwise perform LPM for the packet destination address in the
80 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
81 value (0, 1, ...) and not a VRF id.
84 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
85 - The lookup result adjacency index.
88 - Dispatches the packet to the node index found in
89 ip_adjacency_t @c adj->lookup_next_index
90 (where @c adj is the lookup result adjacency).
92 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
95 return ip4_lookup_inline (vm, node, frame);
98 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
101 VLIB_REGISTER_NODE (ip4_lookup_node) =
103 .name = "ip4-lookup",
104 .vector_size = sizeof (u32),
105 .format_trace = format_ip4_lookup_trace,
106 .n_next_nodes = IP_LOOKUP_N_NEXT,
107 .next_nodes = IP4_LOOKUP_NEXT_NODES,
111 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
112 vlib_node_runtime_t * node,
113 vlib_frame_t * frame)
115 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
117 u32 thread_index = vm->thread_index;
118 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
119 u16 nexts[VLIB_FRAME_SIZE], *next;
121 from = vlib_frame_vector_args (frame);
122 n_left = frame->n_vectors;
125 vlib_get_buffers (vm, from, bufs, n_left);
129 const load_balance_t *lb0, *lb1;
130 const ip4_header_t *ip0, *ip1;
131 u32 lbi0, hc0, lbi1, hc1;
132 const dpo_id_t *dpo0, *dpo1;
134 /* Prefetch next iteration. */
136 vlib_prefetch_buffer_header (b[2], LOAD);
137 vlib_prefetch_buffer_header (b[3], LOAD);
139 CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), LOAD);
140 CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), LOAD);
143 ip0 = vlib_buffer_get_current (b[0]);
144 ip1 = vlib_buffer_get_current (b[1]);
145 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
146 lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
148 lb0 = load_balance_get (lbi0);
149 lb1 = load_balance_get (lbi1);
152 * this node is for via FIBs we can re-use the hash value from the
153 * to node if present.
154 * We don't want to use the same hash value at each level in the recursion
155 * graph as that would lead to polarisation
159 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
161 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
163 hc0 = vnet_buffer (b[0])->ip.flow_hash =
164 vnet_buffer (b[0])->ip.flow_hash >> 1;
168 hc0 = vnet_buffer (b[0])->ip.flow_hash =
169 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
171 dpo0 = load_balance_get_fwd_bucket
172 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
176 dpo0 = load_balance_get_bucket_i (lb0, 0);
178 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
180 if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
182 hc1 = vnet_buffer (b[1])->ip.flow_hash =
183 vnet_buffer (b[1])->ip.flow_hash >> 1;
187 hc1 = vnet_buffer (b[1])->ip.flow_hash =
188 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
190 dpo1 = load_balance_get_fwd_bucket
191 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
195 dpo1 = load_balance_get_bucket_i (lb1, 0);
198 next[0] = dpo0->dpoi_next_node;
199 next[1] = dpo1->dpoi_next_node;
201 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
202 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
204 vlib_increment_combined_counter
205 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
206 vlib_increment_combined_counter
207 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
216 const load_balance_t *lb0;
217 const ip4_header_t *ip0;
218 const dpo_id_t *dpo0;
221 ip0 = vlib_buffer_get_current (b[0]);
222 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
224 lb0 = load_balance_get (lbi0);
227 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
229 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
231 hc0 = vnet_buffer (b[0])->ip.flow_hash =
232 vnet_buffer (b[0])->ip.flow_hash >> 1;
236 hc0 = vnet_buffer (b[0])->ip.flow_hash =
237 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
239 dpo0 = load_balance_get_fwd_bucket
240 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
244 dpo0 = load_balance_get_bucket_i (lb0, 0);
247 next[0] = dpo0->dpoi_next_node;
248 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
250 vlib_increment_combined_counter
251 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
258 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
259 if (node->flags & VLIB_NODE_FLAG_TRACE)
260 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
262 return frame->n_vectors;
266 VLIB_REGISTER_NODE (ip4_load_balance_node) =
268 .name = "ip4-load-balance",
269 .vector_size = sizeof (u32),
270 .sibling_of = "ip4-lookup",
271 .format_trace = format_ip4_lookup_trace,
275 #ifndef CLIB_MARCH_VARIANT
276 /* get first interface address */
278 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
279 ip_interface_address_t ** result_ia)
281 ip_lookup_main_t *lm = &im->lookup_main;
282 ip_interface_address_t *ia = 0;
283 ip4_address_t *result = 0;
286 foreach_ip_interface_address
287 (lm, ia, sw_if_index,
288 1 /* honor unnumbered */ ,
291 ip_interface_address_get_address (lm, ia);
297 *result_ia = result ? ia : 0;
303 ip4_add_subnet_bcast_route (u32 fib_index,
307 vnet_sw_interface_flags_t iflags;
309 iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
311 fib_table_entry_special_remove(fib_index,
313 FIB_SOURCE_INTERFACE);
315 if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
317 fib_table_entry_update_one_path (fib_index, pfx,
318 FIB_SOURCE_INTERFACE,
321 /* No next-hop address */
327 // no out-label stack
329 FIB_ROUTE_PATH_FLAG_NONE);
333 fib_table_entry_special_add(fib_index,
335 FIB_SOURCE_INTERFACE,
336 (FIB_ENTRY_FLAG_DROP |
337 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
342 ip4_add_interface_prefix_routes (ip4_main_t *im,
345 ip_interface_address_t * a)
347 ip_lookup_main_t *lm = &im->lookup_main;
348 ip_interface_prefix_t *if_prefix;
349 ip4_address_t *address = ip_interface_address_get_address (lm, a);
351 ip_interface_prefix_key_t key = {
353 .fp_len = a->address_length,
354 .fp_proto = FIB_PROTOCOL_IP4,
355 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[a->address_length],
357 .sw_if_index = sw_if_index,
360 fib_prefix_t pfx_special = {
361 .fp_proto = FIB_PROTOCOL_IP4,
364 /* If prefix already set on interface, just increment ref count & return */
365 if_prefix = ip_get_interface_prefix (lm, &key);
368 if_prefix->ref_count += 1;
372 /* New prefix - allocate a pool entry, initialize it, add to the hash */
373 pool_get (lm->if_prefix_pool, if_prefix);
374 if_prefix->ref_count = 1;
375 if_prefix->src_ia_index = a - lm->if_address_pool;
376 clib_memcpy (&if_prefix->key, &key, sizeof (key));
377 mhash_set (&lm->prefix_to_if_prefix_index, &key,
378 if_prefix - lm->if_prefix_pool, 0 /* old value */);
380 /* length <= 30 - add glean, drop first address, maybe drop bcast address */
381 if (a->address_length <= 30)
383 pfx_special.fp_len = a->address_length;
384 pfx_special.fp_addr.ip4.as_u32 = address->as_u32;
386 /* set the glean route for the prefix */
387 fib_table_entry_update_one_path (fib_index, &pfx_special,
388 FIB_SOURCE_INTERFACE,
389 (FIB_ENTRY_FLAG_CONNECTED |
390 FIB_ENTRY_FLAG_ATTACHED),
392 /* No next-hop address */
395 /* invalid FIB index */
398 /* no out-label stack */
400 FIB_ROUTE_PATH_FLAG_NONE);
402 /* set a drop route for the base address of the prefix */
403 pfx_special.fp_len = 32;
404 pfx_special.fp_addr.ip4.as_u32 =
405 address->as_u32 & im->fib_masks[a->address_length];
407 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
408 fib_table_entry_special_add (fib_index, &pfx_special,
409 FIB_SOURCE_INTERFACE,
410 (FIB_ENTRY_FLAG_DROP |
411 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
413 /* set a route for the broadcast address of the prefix */
414 pfx_special.fp_len = 32;
415 pfx_special.fp_addr.ip4.as_u32 =
416 address->as_u32 | ~im->fib_masks[a->address_length];
417 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
418 ip4_add_subnet_bcast_route (fib_index, &pfx_special, sw_if_index);
422 /* length == 31 - add an attached route for the other address */
423 else if (a->address_length == 31)
425 pfx_special.fp_len = 32;
426 pfx_special.fp_addr.ip4.as_u32 =
427 address->as_u32 ^ clib_host_to_net_u32(1);
429 fib_table_entry_update_one_path (fib_index, &pfx_special,
430 FIB_SOURCE_INTERFACE,
431 (FIB_ENTRY_FLAG_ATTACHED),
433 &pfx_special.fp_addr,
435 /* invalid FIB index */
439 FIB_ROUTE_PATH_FLAG_NONE);
444 ip4_add_interface_routes (u32 sw_if_index,
445 ip4_main_t * im, u32 fib_index,
446 ip_interface_address_t * a)
448 ip_lookup_main_t *lm = &im->lookup_main;
449 ip4_address_t *address = ip_interface_address_get_address (lm, a);
452 .fp_proto = FIB_PROTOCOL_IP4,
453 .fp_addr.ip4 = *address,
456 /* set special routes for the prefix if needed */
457 ip4_add_interface_prefix_routes (im, sw_if_index, fib_index, a);
459 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
461 u32 classify_table_index =
462 lm->classify_table_index_by_sw_if_index[sw_if_index];
463 if (classify_table_index != (u32) ~ 0)
465 dpo_id_t dpo = DPO_INVALID;
470 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
472 fib_table_entry_special_dpo_add (fib_index,
475 FIB_ENTRY_FLAG_NONE, &dpo);
480 fib_table_entry_update_one_path (fib_index, &pfx,
481 FIB_SOURCE_INTERFACE,
482 (FIB_ENTRY_FLAG_CONNECTED |
483 FIB_ENTRY_FLAG_LOCAL),
490 FIB_ROUTE_PATH_FLAG_NONE);
494 ip4_del_interface_prefix_routes (ip4_main_t * im,
497 ip4_address_t * address,
500 ip_lookup_main_t *lm = &im->lookup_main;
501 ip_interface_prefix_t *if_prefix;
503 ip_interface_prefix_key_t key = {
505 .fp_len = address_length,
506 .fp_proto = FIB_PROTOCOL_IP4,
507 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[address_length],
509 .sw_if_index = sw_if_index,
512 fib_prefix_t pfx_special = {
514 .fp_proto = FIB_PROTOCOL_IP4,
517 if_prefix = ip_get_interface_prefix (lm, &key);
520 clib_warning ("Prefix not found while deleting %U",
521 format_ip4_address_and_length, address, address_length);
525 if_prefix->ref_count -= 1;
528 * Routes need to be adjusted if:
529 * - deleting last intf addr in prefix
530 * - deleting intf addr used as default source address in glean adjacency
532 * We're done now otherwise
534 if ((if_prefix->ref_count > 0) &&
535 !pool_is_free_index (lm->if_address_pool, if_prefix->src_ia_index))
538 /* length <= 30, delete glean route, first address, last address */
539 if (address_length <= 30)
542 /* remove glean route for prefix */
543 pfx_special.fp_addr.ip4 = *address;
544 pfx_special.fp_len = address_length;
545 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
547 /* if no more intf addresses in prefix, remove other special routes */
548 if (!if_prefix->ref_count)
550 /* first address in prefix */
551 pfx_special.fp_addr.ip4.as_u32 =
552 address->as_u32 & im->fib_masks[address_length];
553 pfx_special.fp_len = 32;
555 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
556 fib_table_entry_special_remove (fib_index,
558 FIB_SOURCE_INTERFACE);
560 /* prefix broadcast address */
561 pfx_special.fp_addr.ip4.as_u32 =
562 address->as_u32 | ~im->fib_masks[address_length];
563 pfx_special.fp_len = 32;
565 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
566 fib_table_entry_special_remove (fib_index,
568 FIB_SOURCE_INTERFACE);
571 /* default source addr just got deleted, find another */
573 ip_interface_address_t *new_src_ia = NULL;
574 ip4_address_t *new_src_addr = NULL;
577 ip4_interface_address_matching_destination
578 (im, address, sw_if_index, &new_src_ia);
580 if_prefix->src_ia_index = new_src_ia - lm->if_address_pool;
582 pfx_special.fp_len = address_length;
583 pfx_special.fp_addr.ip4 = *new_src_addr;
585 /* set new glean route for the prefix */
586 fib_table_entry_update_one_path (fib_index, &pfx_special,
587 FIB_SOURCE_INTERFACE,
588 (FIB_ENTRY_FLAG_CONNECTED |
589 FIB_ENTRY_FLAG_ATTACHED),
591 /* No next-hop address */
594 /* invalid FIB index */
597 /* no out-label stack */
599 FIB_ROUTE_PATH_FLAG_NONE);
603 /* length == 31, delete attached route for the other address */
604 else if (address_length == 31)
606 pfx_special.fp_addr.ip4.as_u32 =
607 address->as_u32 ^ clib_host_to_net_u32(1);
609 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
612 mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */);
613 pool_put (lm->if_prefix_pool, if_prefix);
617 ip4_del_interface_routes (u32 sw_if_index,
620 ip4_address_t * address, u32 address_length)
623 .fp_len = address_length,
624 .fp_proto = FIB_PROTOCOL_IP4,
625 .fp_addr.ip4 = *address,
628 ip4_del_interface_prefix_routes (im, sw_if_index, fib_index,
629 address, address_length);
632 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
635 #ifndef CLIB_MARCH_VARIANT
637 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
639 ip4_main_t *im = &ip4_main;
641 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
644 * enable/disable only on the 1<->0 transition
648 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
653 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
654 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
657 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
661 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
662 sw_if_index, !is_enable, 0, 0);
665 ip4_enable_disable_interface_callback_t *cb;
666 vec_foreach (cb, im->enable_disable_interface_callbacks)
667 cb->function (im, cb->function_opaque, sw_if_index, is_enable);
671 static clib_error_t *
672 ip4_add_del_interface_address_internal (vlib_main_t * vm,
674 ip4_address_t * address,
675 u32 address_length, u32 is_del)
677 vnet_main_t *vnm = vnet_get_main ();
678 ip4_main_t *im = &ip4_main;
679 ip_lookup_main_t *lm = &im->lookup_main;
680 clib_error_t *error = 0;
681 u32 if_address_index, elts_before;
682 ip4_address_fib_t ip4_af, *addr_fib = 0;
684 /* local0 interface doesn't support IP addressing */
685 if (sw_if_index == 0)
688 clib_error_create ("local0 interface doesn't support IP addressing");
691 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
692 ip4_addr_fib_init (&ip4_af, address,
693 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
694 vec_add1 (addr_fib, ip4_af);
697 * there is no support for adj-fib handling in the presence of overlapping
698 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
704 /* When adding an address check that it does not conflict
705 with an existing address on any interface in this table. */
706 ip_interface_address_t *ia;
707 vnet_sw_interface_t *sif;
709 pool_foreach(sif, vnm->interface_main.sw_interfaces,
711 if (im->fib_index_by_sw_if_index[sw_if_index] ==
712 im->fib_index_by_sw_if_index[sif->sw_if_index])
714 foreach_ip_interface_address
715 (&im->lookup_main, ia, sif->sw_if_index,
716 0 /* honor unnumbered */ ,
719 ip_interface_address_get_address
720 (&im->lookup_main, ia);
721 if (ip4_destination_matches_route
722 (im, address, x, ia->address_length) ||
723 ip4_destination_matches_route (im,
728 /* an intf may have >1 addr from the same prefix */
729 if ((sw_if_index == sif->sw_if_index) &&
730 (ia->address_length == address_length) &&
731 (x->as_u32 != address->as_u32))
734 /* error if the length or intf was different */
735 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
739 ("failed to add %U on %U which conflicts with %U for interface %U",
740 format_ip4_address_and_length, address,
742 format_vnet_sw_if_index_name, vnm,
744 format_ip4_address_and_length, x,
746 format_vnet_sw_if_index_name, vnm,
755 elts_before = pool_elts (lm->if_address_pool);
757 error = ip_interface_address_add_del
758 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
762 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
764 /* intf addr routes are added/deleted on admin up/down */
765 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
768 ip4_del_interface_routes (sw_if_index,
769 im, ip4_af.fib_index, address,
772 ip4_add_interface_routes (sw_if_index,
773 im, ip4_af.fib_index,
775 (lm->if_address_pool, if_address_index));
778 /* If pool did not grow/shrink: add duplicate address. */
779 if (elts_before != pool_elts (lm->if_address_pool))
781 ip4_add_del_interface_address_callback_t *cb;
782 vec_foreach (cb, im->add_del_interface_address_callbacks)
783 cb->function (im, cb->function_opaque, sw_if_index,
784 address, address_length, if_address_index, is_del);
793 ip4_add_del_interface_address (vlib_main_t * vm,
795 ip4_address_t * address,
796 u32 address_length, u32 is_del)
798 return ip4_add_del_interface_address_internal
799 (vm, sw_if_index, address, address_length, is_del);
803 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
805 ip_interface_address_t *ia;
811 * when directed broadcast is enabled, the subnet braodcast route will forward
812 * packets using an adjacency with a broadcast MAC. otherwise it drops
815 foreach_ip_interface_address(&im->lookup_main, ia,
818 if (ia->address_length <= 30)
822 ipa = ip_interface_address_get_address (&im->lookup_main, ia);
826 .fp_proto = FIB_PROTOCOL_IP4,
828 .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
832 ip4_add_subnet_bcast_route
833 (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
842 static clib_error_t *
843 ip4_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
845 ip4_main_t *im = &ip4_main;
846 ip_interface_address_t *ia;
848 u32 is_admin_up, fib_index;
850 /* Fill in lookup tables with default table (0). */
851 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
853 vec_validate_init_empty (im->
854 lookup_main.if_address_pool_index_by_sw_if_index,
857 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
859 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
862 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
863 0 /* honor unnumbered */,
865 a = ip_interface_address_get_address (&im->lookup_main, ia);
867 ip4_add_interface_routes (sw_if_index,
871 ip4_del_interface_routes (sw_if_index,
873 a, ia->address_length);
880 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
882 /* Built-in ip4 unicast rx feature path definition */
884 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
886 .arc_name = "ip4-unicast",
887 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
888 .last_in_arc = "ip4-lookup",
889 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
892 VNET_FEATURE_INIT (ip4_flow_classify, static) =
894 .arc_name = "ip4-unicast",
895 .node_name = "ip4-flow-classify",
896 .runs_before = VNET_FEATURES ("ip4-inacl"),
899 VNET_FEATURE_INIT (ip4_inacl, static) =
901 .arc_name = "ip4-unicast",
902 .node_name = "ip4-inacl",
903 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
906 VNET_FEATURE_INIT (ip4_source_check_1, static) =
908 .arc_name = "ip4-unicast",
909 .node_name = "ip4-source-check-via-rx",
910 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
913 VNET_FEATURE_INIT (ip4_source_check_2, static) =
915 .arc_name = "ip4-unicast",
916 .node_name = "ip4-source-check-via-any",
917 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
920 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
922 .arc_name = "ip4-unicast",
923 .node_name = "ip4-source-and-port-range-check-rx",
924 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
927 VNET_FEATURE_INIT (ip4_policer_classify, static) =
929 .arc_name = "ip4-unicast",
930 .node_name = "ip4-policer-classify",
931 .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
934 VNET_FEATURE_INIT (ip4_ipsec, static) =
936 .arc_name = "ip4-unicast",
937 .node_name = "ipsec4-input-feature",
938 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
941 VNET_FEATURE_INIT (ip4_vpath, static) =
943 .arc_name = "ip4-unicast",
944 .node_name = "vpath-input-ip4",
945 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
948 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
950 .arc_name = "ip4-unicast",
951 .node_name = "ip4-vxlan-bypass",
952 .runs_before = VNET_FEATURES ("ip4-lookup"),
955 VNET_FEATURE_INIT (ip4_not_enabled, static) =
957 .arc_name = "ip4-unicast",
958 .node_name = "ip4-not-enabled",
959 .runs_before = VNET_FEATURES ("ip4-lookup"),
962 VNET_FEATURE_INIT (ip4_lookup, static) =
964 .arc_name = "ip4-unicast",
965 .node_name = "ip4-lookup",
966 .runs_before = 0, /* not before any other features */
969 /* Built-in ip4 multicast rx feature path definition */
970 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
972 .arc_name = "ip4-multicast",
973 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
974 .last_in_arc = "ip4-mfib-forward-lookup",
975 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
978 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
980 .arc_name = "ip4-multicast",
981 .node_name = "vpath-input-ip4",
982 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
985 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
987 .arc_name = "ip4-multicast",
988 .node_name = "ip4-not-enabled",
989 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
992 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
994 .arc_name = "ip4-multicast",
995 .node_name = "ip4-mfib-forward-lookup",
996 .runs_before = 0, /* last feature */
999 /* Source and port-range check ip4 tx feature path definition */
1000 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1002 .arc_name = "ip4-output",
1003 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
1004 .last_in_arc = "interface-output",
1005 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1008 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1010 .arc_name = "ip4-output",
1011 .node_name = "ip4-source-and-port-range-check-tx",
1012 .runs_before = VNET_FEATURES ("ip4-outacl"),
1015 VNET_FEATURE_INIT (ip4_outacl, static) =
1017 .arc_name = "ip4-output",
1018 .node_name = "ip4-outacl",
1019 .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
1022 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1024 .arc_name = "ip4-output",
1025 .node_name = "ipsec4-output-feature",
1026 .runs_before = VNET_FEATURES ("interface-output"),
1029 /* Built-in ip4 tx feature path definition */
1030 VNET_FEATURE_INIT (ip4_interface_output, static) =
1032 .arc_name = "ip4-output",
1033 .node_name = "interface-output",
1034 .runs_before = 0, /* not before any other features */
1038 static clib_error_t *
1039 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1041 ip4_main_t *im = &ip4_main;
1043 /* Fill in lookup tables with default table (0). */
1044 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1045 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1049 ip4_main_t *im4 = &ip4_main;
1050 ip_lookup_main_t *lm4 = &im4->lookup_main;
1051 ip_interface_address_t *ia = 0;
1052 ip4_address_t *address;
1053 vlib_main_t *vm = vlib_get_main ();
1055 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
1057 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
1059 address = ip_interface_address_get_address (lm4, ia);
1060 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1065 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
1068 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
1069 sw_if_index, is_add, 0, 0);
1071 return /* no error */ 0;
1074 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1076 /* Global IP4 main. */
1077 #ifndef CLIB_MARCH_VARIANT
1078 ip4_main_t ip4_main;
1079 #endif /* CLIB_MARCH_VARIANT */
1081 static clib_error_t *
1082 ip4_lookup_init (vlib_main_t * vm)
1084 ip4_main_t *im = &ip4_main;
1085 clib_error_t *error;
1088 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1090 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
1092 if ((error = vlib_call_init_function (vm, fib_module_init)))
1094 if ((error = vlib_call_init_function (vm, mfib_module_init)))
1097 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1102 m = pow2_mask (i) << (32 - i);
1105 im->fib_masks[i] = clib_host_to_net_u32 (m);
1108 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1110 /* Create FIB with index 0 and table id of 0. */
1111 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1112 FIB_SOURCE_DEFAULT_ROUTE);
1113 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1114 MFIB_SOURCE_DEFAULT_ROUTE);
1118 pn = pg_get_node (ip4_lookup_node.index);
1119 pn->unformat_edit = unformat_pg_ip4_header;
1123 ethernet_arp_header_t h;
1125 clib_memset (&h, 0, sizeof (h));
1127 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1128 #define _8(f,v) h.f = v;
1129 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1130 _16 (l3_type, ETHERNET_TYPE_IP4);
1131 _8 (n_l2_address_bytes, 6);
1132 _8 (n_l3_address_bytes, 4);
1133 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1137 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1140 /* alloc chunk size */ 8,
1147 VLIB_INIT_FUNCTION (ip4_lookup_init);
1151 /* Adjacency taken. */
1156 /* Packet data, possibly *after* rewrite. */
1157 u8 packet_data[64 - 1 * sizeof (u32)];
1159 ip4_forward_next_trace_t;
1161 #ifndef CLIB_MARCH_VARIANT
1163 format_ip4_forward_next_trace (u8 * s, va_list * args)
1165 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1166 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1167 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1168 u32 indent = format_get_indent (s);
1169 s = format (s, "%U%U",
1170 format_white_space, indent,
1171 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1177 format_ip4_lookup_trace (u8 * s, va_list * args)
1179 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1180 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1181 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1182 u32 indent = format_get_indent (s);
1184 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1185 t->fib_index, t->dpo_index, t->flow_hash);
1186 s = format (s, "\n%U%U",
1187 format_white_space, indent,
1188 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1193 format_ip4_rewrite_trace (u8 * s, va_list * args)
1195 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1196 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1197 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1198 u32 indent = format_get_indent (s);
1200 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1201 t->fib_index, t->dpo_index, format_ip_adjacency,
1202 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1203 s = format (s, "\n%U%U",
1204 format_white_space, indent,
1205 format_ip_adjacency_packet_data,
1206 t->packet_data, sizeof (t->packet_data));
1210 #ifndef CLIB_MARCH_VARIANT
1211 /* Common trace function for all ip4-forward next nodes. */
1213 ip4_forward_next_trace (vlib_main_t * vm,
1214 vlib_node_runtime_t * node,
1215 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1218 ip4_main_t *im = &ip4_main;
1220 n_left = frame->n_vectors;
1221 from = vlib_frame_vector_args (frame);
1226 vlib_buffer_t *b0, *b1;
1227 ip4_forward_next_trace_t *t0, *t1;
1229 /* Prefetch next iteration. */
1230 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1231 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1236 b0 = vlib_get_buffer (vm, bi0);
1237 b1 = vlib_get_buffer (vm, bi1);
1239 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1241 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1242 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1243 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1245 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1246 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1247 vec_elt (im->fib_index_by_sw_if_index,
1248 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1250 clib_memcpy_fast (t0->packet_data,
1251 vlib_buffer_get_current (b0),
1252 sizeof (t0->packet_data));
1254 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1256 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1257 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1258 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1260 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1261 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1262 vec_elt (im->fib_index_by_sw_if_index,
1263 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1264 clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1265 sizeof (t1->packet_data));
1275 ip4_forward_next_trace_t *t0;
1279 b0 = vlib_get_buffer (vm, bi0);
1281 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1283 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1284 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1285 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1287 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1288 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1289 vec_elt (im->fib_index_by_sw_if_index,
1290 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1291 clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1292 sizeof (t0->packet_data));
1299 /* Compute TCP/UDP/ICMP4 checksum in software. */
1301 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1305 u32 ip_header_length, payload_length_host_byte_order;
1307 /* Initialize checksum with ip header. */
1308 ip_header_length = ip4_header_bytes (ip0);
1309 payload_length_host_byte_order =
1310 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1312 clib_host_to_net_u32 (payload_length_host_byte_order +
1313 (ip0->protocol << 16));
1315 if (BITS (uword) == 32)
1318 ip_csum_with_carry (sum0,
1319 clib_mem_unaligned (&ip0->src_address, u32));
1321 ip_csum_with_carry (sum0,
1322 clib_mem_unaligned (&ip0->dst_address, u32));
1326 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1328 return ip_calculate_l4_checksum (vm, p0, sum0,
1329 payload_length_host_byte_order, (u8 *) ip0,
1330 ip_header_length, NULL);
1334 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1336 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1340 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1341 || ip0->protocol == IP_PROTOCOL_UDP);
1343 udp0 = (void *) (ip0 + 1);
1344 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1346 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1347 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1351 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1353 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1354 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1361 VNET_FEATURE_ARC_INIT (ip4_local) =
1363 .arc_name = "ip4-local",
1364 .start_nodes = VNET_FEATURES ("ip4-local"),
1365 .last_in_arc = "ip4-local-end-of-arc",
1370 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1371 ip4_header_t * ip, u8 is_udp, u8 * error,
1375 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1376 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1380 u32 ip_len, udp_len;
1382 udp = ip4_next_header (ip);
1383 /* Verify UDP length. */
1384 ip_len = clib_net_to_host_u16 (ip->length);
1385 udp_len = clib_net_to_host_u16 (udp->length);
1387 len_diff = ip_len - udp_len;
1388 *good_tcp_udp &= len_diff >= 0;
1389 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1393 #define ip4_local_csum_is_offloaded(_b) \
1394 _b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM \
1395 || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM
1397 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1398 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1399 || ip4_local_csum_is_offloaded (_b)))
1401 #define ip4_local_csum_is_valid(_b) \
1402 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1403 || (ip4_local_csum_is_offloaded (_b))) != 0
1406 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1407 ip4_header_t * ih, u8 * error)
1409 u8 is_udp, is_tcp_udp, good_tcp_udp;
1411 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1412 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1414 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1415 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1417 good_tcp_udp = ip4_local_csum_is_valid (b);
1419 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1420 *error = (is_tcp_udp && !good_tcp_udp
1421 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1425 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1426 ip4_header_t ** ih, u8 * error)
1428 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1430 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1431 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1433 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1434 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1436 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1437 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1439 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1440 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1443 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1446 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1450 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1451 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1452 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1453 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1457 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1458 vlib_buffer_t * b, u16 * next, u8 error,
1459 u8 head_of_feature_arc)
1461 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1464 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1465 b->error = error ? error_node->errors[error] : 0;
1466 if (head_of_feature_arc)
1469 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1471 vnet_feature_arc_start (arc_index,
1472 vnet_buffer (b)->sw_if_index[VLIB_RX],
1485 } ip4_local_last_check_t;
1488 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1489 ip4_local_last_check_t * last_check, u8 * error0)
1491 ip4_fib_mtrie_leaf_t leaf0;
1492 ip4_fib_mtrie_t *mtrie0;
1493 const dpo_id_t *dpo0;
1494 load_balance_t *lb0;
1497 vnet_buffer (b)->ip.fib_index =
1498 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1499 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1502 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1503 * adjacency for the destination address (the local interface address).
1504 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1505 * adjacency for the source address (the remote sender's address)
1507 if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) ||
1510 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1511 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1512 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1513 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1514 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1516 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1517 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1518 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1520 lb0 = load_balance_get (lbi0);
1521 dpo0 = load_balance_get_bucket_i (lb0, 0);
1524 * Must have a route to source otherwise we drop the packet.
1525 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1528 * - the source is a recieve => it's from us => bogus, do this
1529 * first since it sets a different error code.
1530 * - uRPF check for any route to source - accept if passes.
1531 * - allow packets destined to the broadcast address from unknown sources
1534 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1535 && dpo0->dpoi_type == DPO_RECEIVE) ?
1536 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1537 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1538 && !fib_urpf_check_size (lb0->lb_urpf)
1539 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1540 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1542 last_check->src.as_u32 = ip0->src_address.as_u32;
1543 last_check->lbi = lbi0;
1544 last_check->error = *error0;
1545 last_check->first = 0;
1549 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1550 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1551 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1552 *error0 = last_check->error;
1557 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1558 ip4_local_last_check_t * last_check, u8 * error)
1560 ip4_fib_mtrie_leaf_t leaf[2];
1561 ip4_fib_mtrie_t *mtrie[2];
1562 const dpo_id_t *dpo[2];
1563 load_balance_t *lb[2];
1567 not_last_hit = last_check->first;
1568 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1569 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1571 vnet_buffer (b[0])->ip.fib_index =
1572 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1573 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1574 vnet_buffer (b[0])->ip.fib_index;
1576 vnet_buffer (b[1])->ip.fib_index =
1577 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1578 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1579 vnet_buffer (b[1])->ip.fib_index;
1582 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1583 * adjacency for the destination address (the local interface address).
1584 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1585 * adjacency for the source address (the remote sender's address)
1587 if (PREDICT_TRUE (not_last_hit))
1589 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1590 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1592 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1593 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1595 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1596 &ip[0]->src_address, 2);
1597 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1598 &ip[1]->src_address, 2);
1600 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1601 &ip[0]->src_address, 3);
1602 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1603 &ip[1]->src_address, 3);
1605 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1606 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1608 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1609 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1610 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1612 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1613 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1614 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1616 lb[0] = load_balance_get (lbi[0]);
1617 lb[1] = load_balance_get (lbi[1]);
1619 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1620 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1622 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1623 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1624 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1625 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1626 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1627 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1628 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1630 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1631 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1632 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1633 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1634 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1635 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1636 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1638 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1639 last_check->lbi = lbi[1];
1640 last_check->error = error[1];
1641 last_check->first = 0;
1645 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1646 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1647 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1649 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1650 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1651 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1653 error[0] = last_check->error;
1654 error[1] = last_check->error;
1658 enum ip_local_packet_type_e
1660 IP_LOCAL_PACKET_TYPE_L4,
1661 IP_LOCAL_PACKET_TYPE_NAT,
1662 IP_LOCAL_PACKET_TYPE_FRAG,
1666 * Determine packet type and next node.
1668 * The expectation is that all packets that are not L4 will skip
1669 * checksums and source checks.
1672 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1674 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1676 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1678 *next = IP_LOCAL_NEXT_REASSEMBLY;
1679 return IP_LOCAL_PACKET_TYPE_FRAG;
1681 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1683 *next = lm->local_next_by_ip_protocol[ip->protocol];
1684 return IP_LOCAL_PACKET_TYPE_NAT;
1687 *next = lm->local_next_by_ip_protocol[ip->protocol];
1688 return IP_LOCAL_PACKET_TYPE_L4;
1692 ip4_local_inline (vlib_main_t * vm,
1693 vlib_node_runtime_t * node,
1694 vlib_frame_t * frame, int head_of_feature_arc)
1696 u32 *from, n_left_from;
1697 vlib_node_runtime_t *error_node =
1698 vlib_node_get_runtime (vm, ip4_input_node.index);
1699 u16 nexts[VLIB_FRAME_SIZE], *next;
1700 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1701 ip4_header_t *ip[2];
1704 ip4_local_last_check_t last_check = {
1706 * 0.0.0.0 can appear as the source address of an IP packet,
1707 * as can any other address, hence the need to use the 'first'
1708 * member to make sure the .lbi is initialised for the first
1711 .src = {.as_u32 = 0},
1713 .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1717 from = vlib_frame_vector_args (frame);
1718 n_left_from = frame->n_vectors;
1720 if (node->flags & VLIB_NODE_FLAG_TRACE)
1721 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1723 vlib_get_buffers (vm, from, bufs, n_left_from);
1727 while (n_left_from >= 6)
1731 /* Prefetch next iteration. */
1733 vlib_prefetch_buffer_header (b[4], LOAD);
1734 vlib_prefetch_buffer_header (b[5], LOAD);
1736 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1737 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1740 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1742 ip[0] = vlib_buffer_get_current (b[0]);
1743 ip[1] = vlib_buffer_get_current (b[1]);
1745 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1746 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1748 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1749 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1751 not_batch = pt[0] ^ pt[1];
1753 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1756 if (PREDICT_TRUE (not_batch == 0))
1758 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1759 ip4_local_check_src_x2 (b, ip, &last_check, error);
1765 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1766 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1770 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1771 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1777 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1778 head_of_feature_arc);
1779 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1780 head_of_feature_arc);
1787 while (n_left_from > 0)
1789 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1791 ip[0] = vlib_buffer_get_current (b[0]);
1792 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1793 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1795 if (head_of_feature_arc == 0 || pt[0])
1798 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1799 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1803 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1804 head_of_feature_arc);
1811 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1812 return frame->n_vectors;
1815 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1816 vlib_frame_t * frame)
1818 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1822 VLIB_REGISTER_NODE (ip4_local_node) =
1824 .name = "ip4-local",
1825 .vector_size = sizeof (u32),
1826 .format_trace = format_ip4_forward_next_trace,
1827 .n_next_nodes = IP_LOCAL_N_NEXT,
1830 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1831 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1832 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1833 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1834 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-full-reassembly",
1840 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1841 vlib_node_runtime_t * node,
1842 vlib_frame_t * frame)
1844 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1848 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1849 .name = "ip4-local-end-of-arc",
1850 .vector_size = sizeof (u32),
1852 .format_trace = format_ip4_forward_next_trace,
1853 .sibling_of = "ip4-local",
1856 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1857 .arc_name = "ip4-local",
1858 .node_name = "ip4-local-end-of-arc",
1859 .runs_before = 0, /* not before any other features */
1863 #ifndef CLIB_MARCH_VARIANT
1865 ip4_register_protocol (u32 protocol, u32 node_index)
1867 vlib_main_t *vm = vlib_get_main ();
1868 ip4_main_t *im = &ip4_main;
1869 ip_lookup_main_t *lm = &im->lookup_main;
1871 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1872 lm->local_next_by_ip_protocol[protocol] =
1873 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1877 ip4_unregister_protocol (u32 protocol)
1879 ip4_main_t *im = &ip4_main;
1880 ip_lookup_main_t *lm = &im->lookup_main;
1882 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1883 lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1887 static clib_error_t *
1888 show_ip_local_command_fn (vlib_main_t * vm,
1889 unformat_input_t * input, vlib_cli_command_t * cmd)
1891 ip4_main_t *im = &ip4_main;
1892 ip_lookup_main_t *lm = &im->lookup_main;
1895 vlib_cli_output (vm, "Protocols handled by ip4_local");
1896 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1898 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1900 u32 node_index = vlib_get_node (vm,
1901 ip4_local_node.index)->
1902 next_nodes[lm->local_next_by_ip_protocol[i]];
1903 vlib_cli_output (vm, "%U: %U", format_ip_protocol, i,
1904 format_vlib_node_name, vm, node_index);
1913 * Display the set of protocols handled by the local IPv4 stack.
1916 * Example of how to display local protocol table:
1917 * @cliexstart{show ip local}
1918 * Protocols handled by ip4_local
1925 VLIB_CLI_COMMAND (show_ip_local, static) =
1927 .path = "show ip local",
1928 .function = show_ip_local_command_fn,
1929 .short_help = "show ip local",
1935 IP4_REWRITE_NEXT_DROP,
1936 IP4_REWRITE_NEXT_ICMP_ERROR,
1937 IP4_REWRITE_NEXT_FRAGMENT,
1938 IP4_REWRITE_N_NEXT /* Last */
1939 } ip4_rewrite_next_t;
1942 * This bits of an IPv4 address to mask to construct a multicast
1945 #if CLIB_ARCH_IS_BIG_ENDIAN
1946 #define IP4_MCAST_ADDR_MASK 0x007fffff
1948 #define IP4_MCAST_ADDR_MASK 0xffff7f00
1952 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
1953 u16 adj_packet_bytes, bool df, u16 * next,
1954 u8 is_midchain, u32 * error)
1956 if (packet_len > adj_packet_bytes)
1958 *error = IP4_ERROR_MTU_EXCEEDED;
1961 icmp4_error_set_vnet_buffer
1962 (b, ICMP4_destination_unreachable,
1963 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
1965 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
1969 /* IP fragmentation */
1970 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1972 IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1973 IP_FRAG_NEXT_IP_REWRITE), 0);
1974 *next = IP4_REWRITE_NEXT_FRAGMENT;
1979 /* increment TTL & update checksum.
1980 Works either endian, so no need for byte swap. */
1981 static_always_inline void
1982 ip4_ttl_inc (vlib_buffer_t * b, ip4_header_t * ip)
1986 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
1988 b->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
1994 checksum = ip->checksum - clib_host_to_net_u16 (0x0100);
1995 checksum += checksum >= 0xffff;
1997 ip->checksum = checksum;
2001 ASSERT (ip->checksum == ip4_header_checksum (ip));
2004 /* Decrement TTL & update checksum.
2005 Works either endian, so no need for byte swap. */
2006 static_always_inline void
2007 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2012 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2014 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")