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 */
57 #include <vnet/adj/adj_dp.h>
58 #include <vnet/pg/pg.h>
60 #include <vnet/ip/ip4_forward.h>
61 #include <vnet/interface_output.h>
62 #include <vnet/classify/vnet_classify.h>
64 /** @brief IPv4 lookup node.
67 This is the main IPv4 lookup dispatch node.
69 @param vm vlib_main_t corresponding to the current thread
70 @param node vlib_node_runtime_t
71 @param frame vlib_frame_t whose contents should be dispatched
73 @par Graph mechanics: buffer metadata, next index usage
76 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
77 - Indicates the @c sw_if_index value of the interface that the
78 packet was received on.
79 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
80 - When the value is @c ~0 then the node performs a longest prefix
81 match (LPM) for the packet destination address in the FIB attached
82 to the receive interface.
83 - Otherwise perform LPM for the packet destination address in the
84 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
85 value (0, 1, ...) and not a VRF id.
88 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
89 - The lookup result adjacency index.
92 - Dispatches the packet to the node index found in
93 ip_adjacency_t @c adj->lookup_next_index
94 (where @c adj is the lookup result adjacency).
96 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
99 return ip4_lookup_inline (vm, node, frame);
102 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
105 VLIB_REGISTER_NODE (ip4_lookup_node) =
107 .name = "ip4-lookup",
108 .vector_size = sizeof (u32),
109 .format_trace = format_ip4_lookup_trace,
110 .n_next_nodes = IP_LOOKUP_N_NEXT,
111 .next_nodes = IP4_LOOKUP_NEXT_NODES,
115 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
116 vlib_node_runtime_t * node,
117 vlib_frame_t * frame)
119 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
121 u32 thread_index = vm->thread_index;
122 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
123 u16 nexts[VLIB_FRAME_SIZE], *next;
125 from = vlib_frame_vector_args (frame);
126 n_left = frame->n_vectors;
129 vlib_get_buffers (vm, from, bufs, n_left);
133 const load_balance_t *lb0, *lb1;
134 const ip4_header_t *ip0, *ip1;
135 u32 lbi0, hc0, lbi1, hc1;
136 const dpo_id_t *dpo0, *dpo1;
138 /* Prefetch next iteration. */
140 vlib_prefetch_buffer_header (b[2], LOAD);
141 vlib_prefetch_buffer_header (b[3], LOAD);
143 CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), LOAD);
144 CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), LOAD);
147 ip0 = vlib_buffer_get_current (b[0]);
148 ip1 = vlib_buffer_get_current (b[1]);
149 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
150 lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
152 lb0 = load_balance_get (lbi0);
153 lb1 = load_balance_get (lbi1);
156 * this node is for via FIBs we can re-use the hash value from the
157 * to node if present.
158 * We don't want to use the same hash value at each level in the recursion
159 * graph as that would lead to polarisation
163 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
165 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
167 hc0 = vnet_buffer (b[0])->ip.flow_hash =
168 vnet_buffer (b[0])->ip.flow_hash >> 1;
172 hc0 = vnet_buffer (b[0])->ip.flow_hash =
173 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
175 dpo0 = load_balance_get_fwd_bucket
176 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
180 dpo0 = load_balance_get_bucket_i (lb0, 0);
182 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
184 if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
186 hc1 = vnet_buffer (b[1])->ip.flow_hash =
187 vnet_buffer (b[1])->ip.flow_hash >> 1;
191 hc1 = vnet_buffer (b[1])->ip.flow_hash =
192 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
194 dpo1 = load_balance_get_fwd_bucket
195 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
199 dpo1 = load_balance_get_bucket_i (lb1, 0);
202 next[0] = dpo0->dpoi_next_node;
203 next[1] = dpo1->dpoi_next_node;
205 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
206 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
208 vlib_increment_combined_counter
209 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
210 vlib_increment_combined_counter
211 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
220 const load_balance_t *lb0;
221 const ip4_header_t *ip0;
222 const dpo_id_t *dpo0;
225 ip0 = vlib_buffer_get_current (b[0]);
226 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
228 lb0 = load_balance_get (lbi0);
231 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
233 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
235 hc0 = vnet_buffer (b[0])->ip.flow_hash =
236 vnet_buffer (b[0])->ip.flow_hash >> 1;
240 hc0 = vnet_buffer (b[0])->ip.flow_hash =
241 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
243 dpo0 = load_balance_get_fwd_bucket
244 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
248 dpo0 = load_balance_get_bucket_i (lb0, 0);
251 next[0] = dpo0->dpoi_next_node;
252 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
254 vlib_increment_combined_counter
255 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
262 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
263 if (node->flags & VLIB_NODE_FLAG_TRACE)
264 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
266 return frame->n_vectors;
270 VLIB_REGISTER_NODE (ip4_load_balance_node) =
272 .name = "ip4-load-balance",
273 .vector_size = sizeof (u32),
274 .sibling_of = "ip4-lookup",
275 .format_trace = format_ip4_lookup_trace,
279 #ifndef CLIB_MARCH_VARIANT
280 /* get first interface address */
282 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
283 ip_interface_address_t ** result_ia)
285 ip_lookup_main_t *lm = &im->lookup_main;
286 ip_interface_address_t *ia = 0;
287 ip4_address_t *result = 0;
290 foreach_ip_interface_address
291 (lm, ia, sw_if_index,
292 1 /* honor unnumbered */ ,
295 ip_interface_address_get_address (lm, ia);
301 *result_ia = result ? ia : 0;
307 ip4_add_subnet_bcast_route (u32 fib_index,
311 vnet_sw_interface_flags_t iflags;
313 iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
315 fib_table_entry_special_remove(fib_index,
317 FIB_SOURCE_INTERFACE);
319 if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
321 fib_table_entry_update_one_path (fib_index, pfx,
322 FIB_SOURCE_INTERFACE,
325 /* No next-hop address */
331 // no out-label stack
333 FIB_ROUTE_PATH_FLAG_NONE);
337 fib_table_entry_special_add(fib_index,
339 FIB_SOURCE_INTERFACE,
340 (FIB_ENTRY_FLAG_DROP |
341 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
346 ip4_add_interface_prefix_routes (ip4_main_t *im,
349 ip_interface_address_t * a)
351 ip_lookup_main_t *lm = &im->lookup_main;
352 ip_interface_prefix_t *if_prefix;
353 ip4_address_t *address = ip_interface_address_get_address (lm, a);
355 ip_interface_prefix_key_t key = {
357 .fp_len = a->address_length,
358 .fp_proto = FIB_PROTOCOL_IP4,
359 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[a->address_length],
361 .sw_if_index = sw_if_index,
364 fib_prefix_t pfx_special = {
365 .fp_proto = FIB_PROTOCOL_IP4,
368 /* If prefix already set on interface, just increment ref count & return */
369 if_prefix = ip_get_interface_prefix (lm, &key);
372 if_prefix->ref_count += 1;
376 /* New prefix - allocate a pool entry, initialize it, add to the hash */
377 pool_get (lm->if_prefix_pool, if_prefix);
378 if_prefix->ref_count = 1;
379 if_prefix->src_ia_index = a - lm->if_address_pool;
380 clib_memcpy (&if_prefix->key, &key, sizeof (key));
381 mhash_set (&lm->prefix_to_if_prefix_index, &key,
382 if_prefix - lm->if_prefix_pool, 0 /* old value */);
384 pfx_special.fp_len = a->address_length;
385 pfx_special.fp_addr.ip4.as_u32 = address->as_u32;
387 /* set the glean route for the prefix */
388 fib_table_entry_update_one_path (fib_index, &pfx_special,
389 FIB_SOURCE_INTERFACE,
390 (FIB_ENTRY_FLAG_CONNECTED |
391 FIB_ENTRY_FLAG_ATTACHED),
393 /* No next-hop address */
396 /* invalid FIB index */
399 /* no out-label stack */
401 FIB_ROUTE_PATH_FLAG_NONE);
403 /* length <= 30 - add glean, drop first address, maybe drop bcast address */
404 if (a->address_length <= 30)
406 /* set a drop route for the base address of the prefix */
407 pfx_special.fp_len = 32;
408 pfx_special.fp_addr.ip4.as_u32 =
409 address->as_u32 & im->fib_masks[a->address_length];
411 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
412 fib_table_entry_special_add (fib_index, &pfx_special,
413 FIB_SOURCE_INTERFACE,
414 (FIB_ENTRY_FLAG_DROP |
415 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
417 /* set a route for the broadcast address of the prefix */
418 pfx_special.fp_len = 32;
419 pfx_special.fp_addr.ip4.as_u32 =
420 address->as_u32 | ~im->fib_masks[a->address_length];
421 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
422 ip4_add_subnet_bcast_route (fib_index, &pfx_special, sw_if_index);
426 /* length == 31 - add an attached route for the other address */
427 else if (a->address_length == 31)
429 pfx_special.fp_len = 32;
430 pfx_special.fp_addr.ip4.as_u32 =
431 address->as_u32 ^ clib_host_to_net_u32(1);
433 fib_table_entry_update_one_path (fib_index, &pfx_special,
434 FIB_SOURCE_INTERFACE,
435 (FIB_ENTRY_FLAG_ATTACHED),
437 &pfx_special.fp_addr,
439 /* invalid FIB index */
443 FIB_ROUTE_PATH_FLAG_NONE);
448 ip4_add_interface_routes (u32 sw_if_index,
449 ip4_main_t * im, u32 fib_index,
450 ip_interface_address_t * a)
452 ip_lookup_main_t *lm = &im->lookup_main;
453 ip4_address_t *address = ip_interface_address_get_address (lm, a);
456 .fp_proto = FIB_PROTOCOL_IP4,
457 .fp_addr.ip4 = *address,
460 /* set special routes for the prefix if needed */
461 ip4_add_interface_prefix_routes (im, sw_if_index, fib_index, a);
463 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
465 u32 classify_table_index =
466 lm->classify_table_index_by_sw_if_index[sw_if_index];
467 if (classify_table_index != (u32) ~ 0)
469 dpo_id_t dpo = DPO_INVALID;
474 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
476 fib_table_entry_special_dpo_add (fib_index,
479 FIB_ENTRY_FLAG_NONE, &dpo);
484 fib_table_entry_update_one_path (fib_index, &pfx,
485 FIB_SOURCE_INTERFACE,
486 (FIB_ENTRY_FLAG_CONNECTED |
487 FIB_ENTRY_FLAG_LOCAL),
494 FIB_ROUTE_PATH_FLAG_NONE);
498 ip4_del_interface_prefix_routes (ip4_main_t * im,
501 ip4_address_t * address,
504 ip_lookup_main_t *lm = &im->lookup_main;
505 ip_interface_prefix_t *if_prefix;
507 ip_interface_prefix_key_t key = {
509 .fp_len = address_length,
510 .fp_proto = FIB_PROTOCOL_IP4,
511 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[address_length],
513 .sw_if_index = sw_if_index,
516 fib_prefix_t pfx_special = {
518 .fp_proto = FIB_PROTOCOL_IP4,
521 if_prefix = ip_get_interface_prefix (lm, &key);
524 clib_warning ("Prefix not found while deleting %U",
525 format_ip4_address_and_length, address, address_length);
529 if_prefix->ref_count -= 1;
532 * Routes need to be adjusted if deleting last intf addr in prefix
534 * We're done now otherwise
536 if (if_prefix->ref_count > 0)
539 /* length <= 30, delete glean route, first address, last address */
540 if (address_length <= 30)
542 /* Less work to do in FIB if we remove the covered /32s first */
544 /* first address in prefix */
545 pfx_special.fp_addr.ip4.as_u32 =
546 address->as_u32 & im->fib_masks[address_length];
547 pfx_special.fp_len = 32;
549 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
550 fib_table_entry_special_remove (fib_index,
552 FIB_SOURCE_INTERFACE);
554 /* prefix broadcast address */
555 pfx_special.fp_addr.ip4.as_u32 =
556 address->as_u32 | ~im->fib_masks[address_length];
557 pfx_special.fp_len = 32;
559 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
560 fib_table_entry_special_remove (fib_index,
562 FIB_SOURCE_INTERFACE);
564 else if (address_length == 31)
566 /* length == 31, delete attached route for the other address */
567 pfx_special.fp_addr.ip4.as_u32 =
568 address->as_u32 ^ clib_host_to_net_u32(1);
570 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
573 /* remove glean route for prefix */
574 pfx_special.fp_addr.ip4 = *address;
575 pfx_special.fp_len = address_length;
576 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
578 mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */);
579 pool_put (lm->if_prefix_pool, if_prefix);
583 ip4_del_interface_routes (u32 sw_if_index,
586 ip4_address_t * address, u32 address_length)
590 .fp_proto = FIB_PROTOCOL_IP4,
591 .fp_addr.ip4 = *address,
594 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
596 ip4_del_interface_prefix_routes (im, sw_if_index, fib_index,
597 address, address_length);
600 #ifndef CLIB_MARCH_VARIANT
602 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
604 ip4_main_t *im = &ip4_main;
605 vnet_main_t *vnm = vnet_get_main ();
606 vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
608 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
611 * enable/disable only on the 1<->0 transition
615 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
620 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
621 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
624 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
628 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
629 sw_if_index, !is_enable, 0, 0);
633 else if (hi->l3_if_count)
637 ip4_enable_disable_interface_callback_t *cb;
638 vec_foreach (cb, im->enable_disable_interface_callbacks)
639 cb->function (im, cb->function_opaque, sw_if_index, is_enable);
643 static clib_error_t *
644 ip4_add_del_interface_address_internal (vlib_main_t * vm,
646 ip4_address_t * address,
647 u32 address_length, u32 is_del)
649 vnet_main_t *vnm = vnet_get_main ();
650 ip4_main_t *im = &ip4_main;
651 ip_lookup_main_t *lm = &im->lookup_main;
652 clib_error_t *error = 0;
653 u32 if_address_index;
654 ip4_address_fib_t ip4_af, *addr_fib = 0;
656 /* local0 interface doesn't support IP addressing */
657 if (sw_if_index == 0)
660 clib_error_create ("local0 interface doesn't support IP addressing");
663 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
664 ip4_addr_fib_init (&ip4_af, address,
665 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
666 vec_add1 (addr_fib, ip4_af);
669 * there is no support for adj-fib handling in the presence of overlapping
670 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
676 /* When adding an address check that it does not conflict
677 with an existing address on any interface in this table. */
678 ip_interface_address_t *ia;
679 vnet_sw_interface_t *sif;
681 pool_foreach (sif, vnm->interface_main.sw_interfaces)
683 if (im->fib_index_by_sw_if_index[sw_if_index] ==
684 im->fib_index_by_sw_if_index[sif->sw_if_index])
686 foreach_ip_interface_address
687 (&im->lookup_main, ia, sif->sw_if_index,
688 0 /* honor unnumbered */ ,
691 ip_interface_address_get_address
692 (&im->lookup_main, ia);
694 if (ip4_destination_matches_route
695 (im, address, x, ia->address_length) ||
696 ip4_destination_matches_route (im,
701 /* an intf may have >1 addr from the same prefix */
702 if ((sw_if_index == sif->sw_if_index) &&
703 (ia->address_length == address_length) &&
704 (x->as_u32 != address->as_u32))
707 if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
708 /* if the address we're comparing against is stale
709 * then the CP has not added this one back yet, maybe
710 * it never will, so we have to assume it won't and
711 * ignore it. if it does add it back, then it will fail
712 * because this one is now present */
715 /* error if the length or intf was different */
716 vnm->api_errno = VNET_API_ERROR_ADDRESS_IN_USE;
718 error = clib_error_create
719 ("failed to add %U on %U which conflicts with %U for interface %U",
720 format_ip4_address_and_length, address,
722 format_vnet_sw_if_index_name, vnm,
724 format_ip4_address_and_length, x,
726 format_vnet_sw_if_index_name, vnm,
736 if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
740 if (~0 == if_address_index)
742 vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
743 error = clib_error_create ("%U not found for interface %U",
744 lm->format_address_and_length,
745 addr_fib, address_length,
746 format_vnet_sw_if_index_name, vnm,
751 error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
752 address_length, sw_if_index);
758 if (~0 != if_address_index)
760 ip_interface_address_t *ia;
762 ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
764 if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
766 if (ia->sw_if_index == sw_if_index)
768 /* re-adding an address during the replace action.
769 * consdier this the update. clear the flag and
771 ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
776 /* The prefix is moving from one interface to another.
777 * delete the stale and add the new */
778 ip4_add_del_interface_address_internal (vm,
783 error = ip_interface_address_add (lm, sw_if_index,
784 addr_fib, address_length,
790 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
791 error = clib_error_create
792 ("Prefix %U already found on interface %U",
793 lm->format_address_and_length, addr_fib, address_length,
794 format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
798 error = ip_interface_address_add (lm, sw_if_index,
799 addr_fib, address_length,
806 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
807 ip4_mfib_interface_enable_disable (sw_if_index, !is_del);
809 /* intf addr routes are added/deleted on admin up/down */
810 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
813 ip4_del_interface_routes (sw_if_index,
814 im, ip4_af.fib_index, address,
817 ip4_add_interface_routes (sw_if_index,
818 im, ip4_af.fib_index,
820 (lm->if_address_pool, if_address_index));
823 ip4_add_del_interface_address_callback_t *cb;
824 vec_foreach (cb, im->add_del_interface_address_callbacks)
825 cb->function (im, cb->function_opaque, sw_if_index,
826 address, address_length, if_address_index, is_del);
834 ip4_add_del_interface_address (vlib_main_t * vm,
836 ip4_address_t * address,
837 u32 address_length, u32 is_del)
839 return ip4_add_del_interface_address_internal
840 (vm, sw_if_index, address, address_length, is_del);
844 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
846 ip_interface_address_t *ia;
852 * when directed broadcast is enabled, the subnet braodcast route will forward
853 * packets using an adjacency with a broadcast MAC. otherwise it drops
856 foreach_ip_interface_address(&im->lookup_main, ia,
859 if (ia->address_length <= 30)
863 ipa = ip_interface_address_get_address (&im->lookup_main, ia);
867 .fp_proto = FIB_PROTOCOL_IP4,
869 .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
873 ip4_add_subnet_bcast_route
874 (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
883 static clib_error_t *
884 ip4_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
886 ip4_main_t *im = &ip4_main;
887 ip_interface_address_t *ia;
889 u32 is_admin_up, fib_index;
891 /* Fill in lookup tables with default table (0). */
892 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
894 vec_validate_init_empty (im->
895 lookup_main.if_address_pool_index_by_sw_if_index,
898 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
900 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
903 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
904 0 /* honor unnumbered */,
906 a = ip_interface_address_get_address (&im->lookup_main, ia);
908 ip4_add_interface_routes (sw_if_index,
912 ip4_del_interface_routes (sw_if_index,
914 a, ia->address_length);
921 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
923 /* Built-in ip4 unicast rx feature path definition */
925 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
927 .arc_name = "ip4-unicast",
928 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
929 .last_in_arc = "ip4-lookup",
930 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
933 VNET_FEATURE_INIT (ip4_flow_classify, static) =
935 .arc_name = "ip4-unicast",
936 .node_name = "ip4-flow-classify",
937 .runs_before = VNET_FEATURES ("ip4-inacl"),
940 VNET_FEATURE_INIT (ip4_inacl, static) =
942 .arc_name = "ip4-unicast",
943 .node_name = "ip4-inacl",
944 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
947 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
949 .arc_name = "ip4-unicast",
950 .node_name = "ip4-source-and-port-range-check-rx",
951 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
954 VNET_FEATURE_INIT (ip4_policer_classify, static) =
956 .arc_name = "ip4-unicast",
957 .node_name = "ip4-policer-classify",
958 .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
961 VNET_FEATURE_INIT (ip4_ipsec, static) =
963 .arc_name = "ip4-unicast",
964 .node_name = "ipsec4-input-feature",
965 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
968 VNET_FEATURE_INIT (ip4_vpath, static) =
970 .arc_name = "ip4-unicast",
971 .node_name = "vpath-input-ip4",
972 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
975 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
977 .arc_name = "ip4-unicast",
978 .node_name = "ip4-vxlan-bypass",
979 .runs_before = VNET_FEATURES ("ip4-lookup"),
982 VNET_FEATURE_INIT (ip4_not_enabled, static) =
984 .arc_name = "ip4-unicast",
985 .node_name = "ip4-not-enabled",
986 .runs_before = VNET_FEATURES ("ip4-lookup"),
989 VNET_FEATURE_INIT (ip4_lookup, static) =
991 .arc_name = "ip4-unicast",
992 .node_name = "ip4-lookup",
993 .runs_before = 0, /* not before any other features */
996 /* Built-in ip4 multicast rx feature path definition */
997 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
999 .arc_name = "ip4-multicast",
1000 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1001 .last_in_arc = "ip4-mfib-forward-lookup",
1002 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1005 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1007 .arc_name = "ip4-multicast",
1008 .node_name = "vpath-input-ip4",
1009 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1012 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
1014 .arc_name = "ip4-multicast",
1015 .node_name = "ip4-not-enabled",
1016 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1019 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1021 .arc_name = "ip4-multicast",
1022 .node_name = "ip4-mfib-forward-lookup",
1023 .runs_before = 0, /* last feature */
1026 /* Source and port-range check ip4 tx feature path definition */
1027 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1029 .arc_name = "ip4-output",
1030 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
1031 .last_in_arc = "interface-output",
1032 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1035 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1037 .arc_name = "ip4-output",
1038 .node_name = "ip4-source-and-port-range-check-tx",
1039 .runs_before = VNET_FEATURES ("ip4-outacl"),
1042 VNET_FEATURE_INIT (ip4_outacl, static) =
1044 .arc_name = "ip4-output",
1045 .node_name = "ip4-outacl",
1046 .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
1049 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1051 .arc_name = "ip4-output",
1052 .node_name = "ipsec4-output-feature",
1053 .runs_before = VNET_FEATURES ("interface-output"),
1056 /* Built-in ip4 tx feature path definition */
1057 VNET_FEATURE_INIT (ip4_interface_output, static) =
1059 .arc_name = "ip4-output",
1060 .node_name = "interface-output",
1061 .runs_before = 0, /* not before any other features */
1065 static clib_error_t *
1066 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1068 ip4_main_t *im = &ip4_main;
1070 /* Fill in lookup tables with default table (0). */
1071 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1072 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1076 ip4_main_t *im4 = &ip4_main;
1077 ip_lookup_main_t *lm4 = &im4->lookup_main;
1078 ip_interface_address_t *ia = 0;
1079 ip4_address_t *address;
1080 vlib_main_t *vm = vlib_get_main ();
1082 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
1084 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
1086 address = ip_interface_address_get_address (lm4, ia);
1087 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1090 ip4_mfib_interface_enable_disable (sw_if_index, 0);
1093 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
1096 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
1097 sw_if_index, is_add, 0, 0);
1099 return /* no error */ 0;
1102 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1104 /* Global IP4 main. */
1105 #ifndef CLIB_MARCH_VARIANT
1106 ip4_main_t ip4_main;
1107 #endif /* CLIB_MARCH_VARIANT */
1109 static clib_error_t *
1110 ip4_lookup_init (vlib_main_t * vm)
1112 ip4_main_t *im = &ip4_main;
1113 clib_error_t *error;
1116 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1118 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
1120 if ((error = vlib_call_init_function (vm, fib_module_init)))
1122 if ((error = vlib_call_init_function (vm, mfib_module_init)))
1125 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1130 m = pow2_mask (i) << (32 - i);
1133 im->fib_masks[i] = clib_host_to_net_u32 (m);
1136 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1138 /* Create FIB with index 0 and table id of 0. */
1139 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1140 FIB_SOURCE_DEFAULT_ROUTE);
1141 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1142 MFIB_SOURCE_DEFAULT_ROUTE);
1146 pn = pg_get_node (ip4_lookup_node.index);
1147 pn->unformat_edit = unformat_pg_ip4_header;
1151 ethernet_arp_header_t h;
1153 clib_memset (&h, 0, sizeof (h));
1155 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1156 #define _8(f,v) h.f = v;
1157 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1158 _16 (l3_type, ETHERNET_TYPE_IP4);
1159 _8 (n_l2_address_bytes, 6);
1160 _8 (n_l3_address_bytes, 4);
1161 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1165 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1168 /* alloc chunk size */ 8,
1175 VLIB_INIT_FUNCTION (ip4_lookup_init);
1179 /* Adjacency taken. */
1184 /* Packet data, possibly *after* rewrite. */
1185 u8 packet_data[64 - 1 * sizeof (u32)];
1187 ip4_forward_next_trace_t;
1189 #ifndef CLIB_MARCH_VARIANT
1191 format_ip4_forward_next_trace (u8 * s, va_list * args)
1193 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1194 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1195 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1196 u32 indent = format_get_indent (s);
1197 s = format (s, "%U%U",
1198 format_white_space, indent,
1199 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1205 format_ip4_lookup_trace (u8 * s, va_list * args)
1207 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1208 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1209 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1210 u32 indent = format_get_indent (s);
1212 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1213 t->fib_index, t->dpo_index, t->flow_hash);
1214 s = format (s, "\n%U%U",
1215 format_white_space, indent,
1216 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1221 format_ip4_rewrite_trace (u8 * s, va_list * args)
1223 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1224 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1225 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1226 u32 indent = format_get_indent (s);
1228 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1229 t->fib_index, t->dpo_index, format_ip_adjacency,
1230 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1231 s = format (s, "\n%U%U",
1232 format_white_space, indent,
1233 format_ip_adjacency_packet_data,
1234 t->packet_data, sizeof (t->packet_data));
1238 #ifndef CLIB_MARCH_VARIANT
1239 /* Common trace function for all ip4-forward next nodes. */
1241 ip4_forward_next_trace (vlib_main_t * vm,
1242 vlib_node_runtime_t * node,
1243 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1246 ip4_main_t *im = &ip4_main;
1248 n_left = frame->n_vectors;
1249 from = vlib_frame_vector_args (frame);
1254 vlib_buffer_t *b0, *b1;
1255 ip4_forward_next_trace_t *t0, *t1;
1257 /* Prefetch next iteration. */
1258 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1259 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1264 b0 = vlib_get_buffer (vm, bi0);
1265 b1 = vlib_get_buffer (vm, bi1);
1267 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1269 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1270 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1271 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1273 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1274 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1275 vec_elt (im->fib_index_by_sw_if_index,
1276 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1278 clib_memcpy_fast (t0->packet_data,
1279 vlib_buffer_get_current (b0),
1280 sizeof (t0->packet_data));
1282 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1284 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1285 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1286 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1288 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1289 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1290 vec_elt (im->fib_index_by_sw_if_index,
1291 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1292 clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1293 sizeof (t1->packet_data));
1303 ip4_forward_next_trace_t *t0;
1307 b0 = vlib_get_buffer (vm, bi0);
1309 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1311 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1312 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1313 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1315 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1316 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1317 vec_elt (im->fib_index_by_sw_if_index,
1318 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1319 clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1320 sizeof (t0->packet_data));
1327 /* Compute TCP/UDP/ICMP4 checksum in software. */
1329 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1333 u32 ip_header_length, payload_length_host_byte_order;
1335 /* Initialize checksum with ip header. */
1336 ip_header_length = ip4_header_bytes (ip0);
1337 payload_length_host_byte_order =
1338 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1340 clib_host_to_net_u32 (payload_length_host_byte_order +
1341 (ip0->protocol << 16));
1343 if (BITS (uword) == 32)
1346 ip_csum_with_carry (sum0,
1347 clib_mem_unaligned (&ip0->src_address, u32));
1349 ip_csum_with_carry (sum0,
1350 clib_mem_unaligned (&ip0->dst_address, u32));
1354 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1356 return ip_calculate_l4_checksum (vm, p0, sum0,
1357 payload_length_host_byte_order, (u8 *) ip0,
1358 ip_header_length, NULL);
1362 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1364 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1368 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1369 || ip0->protocol == IP_PROTOCOL_UDP);
1371 udp0 = (void *) (ip0 + 1);
1372 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1374 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1375 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1379 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1381 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1382 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1389 VNET_FEATURE_ARC_INIT (ip4_local) =
1391 .arc_name = "ip4-local",
1392 .start_nodes = VNET_FEATURES ("ip4-local"),
1393 .last_in_arc = "ip4-local-end-of-arc",
1398 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1399 ip4_header_t * ip, u8 is_udp, u8 * error,
1403 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1404 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1408 u32 ip_len, udp_len;
1410 udp = ip4_next_header (ip);
1411 /* Verify UDP length. */
1412 ip_len = clib_net_to_host_u16 (ip->length);
1413 udp_len = clib_net_to_host_u16 (udp->length);
1415 len_diff = ip_len - udp_len;
1416 *good_tcp_udp &= len_diff >= 0;
1417 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1421 #define ip4_local_csum_is_offloaded(_b) \
1422 ((_b->flags & VNET_BUFFER_F_OFFLOAD) && \
1423 (vnet_buffer (_b)->oflags & \
1424 (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM | VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)))
1426 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1427 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1428 || ip4_local_csum_is_offloaded (_b)))
1430 #define ip4_local_csum_is_valid(_b) \
1431 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1432 || (ip4_local_csum_is_offloaded (_b))) != 0
1435 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1436 ip4_header_t * ih, u8 * error)
1438 u8 is_udp, is_tcp_udp, good_tcp_udp;
1440 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1441 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1443 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1444 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1446 good_tcp_udp = ip4_local_csum_is_valid (b);
1448 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1449 *error = (is_tcp_udp && !good_tcp_udp
1450 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1454 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1455 ip4_header_t ** ih, u8 * error)
1457 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1459 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1460 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1462 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1463 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1465 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1466 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1468 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1469 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1472 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1475 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1479 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1480 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1481 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1482 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1486 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1487 vlib_buffer_t * b, u16 * next, u8 error,
1488 u8 head_of_feature_arc)
1490 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1493 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1494 b->error = error ? error_node->errors[error] : 0;
1495 if (head_of_feature_arc)
1498 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1500 vnet_feature_arc_start (arc_index,
1501 vnet_buffer (b)->sw_if_index[VLIB_RX],
1514 } ip4_local_last_check_t;
1517 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1518 ip4_local_last_check_t * last_check, u8 * error0)
1520 const dpo_id_t *dpo0;
1521 load_balance_t *lb0;
1524 vnet_buffer (b)->ip.fib_index =
1525 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1526 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1529 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1530 * adjacency for the destination address (the local interface address).
1531 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1532 * adjacency for the source address (the remote sender's address)
1534 if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) ||
1537 lbi0 = ip4_fib_forwarding_lookup (vnet_buffer (b)->ip.fib_index,
1540 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1541 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1542 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1544 lb0 = load_balance_get (lbi0);
1545 dpo0 = load_balance_get_bucket_i (lb0, 0);
1548 * Must have a route to source otherwise we drop the packet.
1549 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1552 * - the source is a recieve => it's from us => bogus, do this
1553 * first since it sets a different error code.
1554 * - uRPF check for any route to source - accept if passes.
1555 * - allow packets destined to the broadcast address from unknown sources
1558 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1559 && dpo0->dpoi_type == DPO_RECEIVE) ?
1560 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1561 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1562 && !fib_urpf_check_size (lb0->lb_urpf)
1563 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1564 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1566 last_check->src.as_u32 = ip0->src_address.as_u32;
1567 last_check->lbi = lbi0;
1568 last_check->error = *error0;
1569 last_check->first = 0;
1573 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1574 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1575 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1576 *error0 = last_check->error;
1581 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1582 ip4_local_last_check_t * last_check, u8 * error)
1584 const dpo_id_t *dpo[2];
1585 load_balance_t *lb[2];
1589 not_last_hit = last_check->first;
1590 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1591 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1593 vnet_buffer (b[0])->ip.fib_index =
1594 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1595 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1596 vnet_buffer (b[0])->ip.fib_index;
1598 vnet_buffer (b[1])->ip.fib_index =
1599 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1600 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1601 vnet_buffer (b[1])->ip.fib_index;
1604 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1605 * adjacency for the destination address (the local interface address).
1606 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1607 * adjacency for the source address (the remote sender's address)
1609 if (PREDICT_TRUE (not_last_hit))
1611 ip4_fib_forwarding_lookup_x2 (
1612 vnet_buffer (b[0])->ip.fib_index, vnet_buffer (b[1])->ip.fib_index,
1613 &ip[0]->src_address, &ip[1]->src_address, &lbi[0], &lbi[1]);
1615 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1616 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1617 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1619 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1620 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1621 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1623 lb[0] = load_balance_get (lbi[0]);
1624 lb[1] = load_balance_get (lbi[1]);
1626 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1627 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1629 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1630 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1631 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1632 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1633 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1634 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1635 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1637 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1638 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1639 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1640 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1641 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1642 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1643 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1645 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1646 last_check->lbi = lbi[1];
1647 last_check->error = error[1];
1648 last_check->first = 0;
1652 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1653 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1654 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1656 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1657 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1658 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1660 error[0] = last_check->error;
1661 error[1] = last_check->error;
1665 enum ip_local_packet_type_e
1667 IP_LOCAL_PACKET_TYPE_L4,
1668 IP_LOCAL_PACKET_TYPE_NAT,
1669 IP_LOCAL_PACKET_TYPE_FRAG,
1673 * Determine packet type and next node.
1675 * The expectation is that all packets that are not L4 will skip
1676 * checksums and source checks.
1679 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1681 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1683 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1685 *next = IP_LOCAL_NEXT_REASSEMBLY;
1686 return IP_LOCAL_PACKET_TYPE_FRAG;
1688 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1690 *next = lm->local_next_by_ip_protocol[ip->protocol];
1691 return IP_LOCAL_PACKET_TYPE_NAT;
1694 *next = lm->local_next_by_ip_protocol[ip->protocol];
1695 return IP_LOCAL_PACKET_TYPE_L4;
1699 ip4_local_inline (vlib_main_t * vm,
1700 vlib_node_runtime_t * node,
1701 vlib_frame_t * frame, int head_of_feature_arc)
1703 u32 *from, n_left_from;
1704 vlib_node_runtime_t *error_node =
1705 vlib_node_get_runtime (vm, ip4_local_node.index);
1706 u16 nexts[VLIB_FRAME_SIZE], *next;
1707 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1708 ip4_header_t *ip[2];
1711 ip4_local_last_check_t last_check = {
1713 * 0.0.0.0 can appear as the source address of an IP packet,
1714 * as can any other address, hence the need to use the 'first'
1715 * member to make sure the .lbi is initialised for the first
1718 .src = {.as_u32 = 0},
1720 .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1724 from = vlib_frame_vector_args (frame);
1725 n_left_from = frame->n_vectors;
1727 if (node->flags & VLIB_NODE_FLAG_TRACE)
1728 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1730 vlib_get_buffers (vm, from, bufs, n_left_from);
1734 while (n_left_from >= 6)
1738 /* Prefetch next iteration. */
1740 vlib_prefetch_buffer_header (b[4], LOAD);
1741 vlib_prefetch_buffer_header (b[5], LOAD);
1743 clib_prefetch_load (b[4]->data);
1744 clib_prefetch_load (b[5]->data);
1747 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1749 ip[0] = vlib_buffer_get_current (b[0]);
1750 ip[1] = vlib_buffer_get_current (b[1]);
1752 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1753 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1755 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1756 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1758 not_batch = pt[0] ^ pt[1];
1760 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1763 if (PREDICT_TRUE (not_batch == 0))
1765 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1766 ip4_local_check_src_x2 (b, ip, &last_check, error);
1772 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1773 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1777 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1778 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1784 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1785 head_of_feature_arc);
1786 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1787 head_of_feature_arc);
1794 while (n_left_from > 0)
1796 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1798 ip[0] = vlib_buffer_get_current (b[0]);
1799 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1800 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1802 if (head_of_feature_arc == 0 || pt[0])
1805 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1806 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1810 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1811 head_of_feature_arc);
1818 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1819 return frame->n_vectors;
1822 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1823 vlib_frame_t * frame)
1825 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1829 VLIB_REGISTER_NODE (ip4_local_node) =
1831 .name = "ip4-local",
1832 .vector_size = sizeof (u32),
1833 .format_trace = format_ip4_forward_next_trace,
1834 .n_errors = IP4_N_ERROR,
1835 .error_strings = ip4_error_strings,
1836 .n_next_nodes = IP_LOCAL_N_NEXT,
1839 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1840 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1841 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1842 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1843 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-full-reassembly",
1849 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1850 vlib_node_runtime_t * node,
1851 vlib_frame_t * frame)
1853 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1857 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1858 .name = "ip4-local-end-of-arc",
1859 .vector_size = sizeof (u32),
1861 .format_trace = format_ip4_forward_next_trace,
1862 .sibling_of = "ip4-local",
1865 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1866 .arc_name = "ip4-local",
1867 .node_name = "ip4-local-end-of-arc",
1868 .runs_before = 0, /* not before any other features */
1872 #ifndef CLIB_MARCH_VARIANT
1874 ip4_register_protocol (u32 protocol, u32 node_index)
1876 vlib_main_t *vm = vlib_get_main ();
1877 ip4_main_t *im = &ip4_main;
1878 ip_lookup_main_t *lm = &im->lookup_main;
1880 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1881 lm->local_next_by_ip_protocol[protocol] =
1882 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1886 ip4_unregister_protocol (u32 protocol)
1888 ip4_main_t *im = &ip4_main;
1889 ip_lookup_main_t *lm = &im->lookup_main;
1891 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1892 lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1896 static clib_error_t *
1897 show_ip_local_command_fn (vlib_main_t * vm,
1898 unformat_input_t * input, vlib_cli_command_t * cmd)
1900 ip4_main_t *im = &ip4_main;
1901 ip_lookup_main_t *lm = &im->lookup_main;
1904 vlib_cli_output (vm, "Protocols handled by ip4_local");
1905 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1907 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1909 u32 node_index = vlib_get_node (vm,
1910 ip4_local_node.index)->
1911 next_nodes[lm->local_next_by_ip_protocol[i]];
1912 vlib_cli_output (vm, "%U: %U", format_ip_protocol, i,
1913 format_vlib_node_name, vm, node_index);
1922 * Display the set of protocols handled by the local IPv4 stack.
1925 * Example of how to display local protocol table:
1926 * @cliexstart{show ip local}
1927 * Protocols handled by ip4_local
1934 VLIB_CLI_COMMAND (show_ip_local, static) =
1936 .path = "show ip local",
1937 .function = show_ip_local_command_fn,
1938 .short_help = "show ip local",
1944 IP4_REWRITE_NEXT_DROP,
1945 IP4_REWRITE_NEXT_ICMP_ERROR,
1946 IP4_REWRITE_NEXT_FRAGMENT,
1947 IP4_REWRITE_N_NEXT /* Last */
1948 } ip4_rewrite_next_t;
1951 * This bits of an IPv4 address to mask to construct a multicast
1954 #if CLIB_ARCH_IS_BIG_ENDIAN
1955 #define IP4_MCAST_ADDR_MASK 0x007fffff
1957 #define IP4_MCAST_ADDR_MASK 0xffff7f00
1961 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
1962 u16 adj_packet_bytes, bool df, u16 * next,
1963 u8 is_midchain, u32 * error)
1965 if (packet_len > adj_packet_bytes)
1967 *error = IP4_ERROR_MTU_EXCEEDED;
1970 icmp4_error_set_vnet_buffer
1971 (b, ICMP4_destination_unreachable,
1972 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
1974 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
1978 /* IP fragmentation */
1979 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
1981 IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
1982 IP_FRAG_NEXT_IP_REWRITE), 0);
1983 *next = IP4_REWRITE_NEXT_FRAGMENT;
1988 /* increment TTL & update checksum.
1989 Works either endian, so no need for byte swap. */
1990 static_always_inline void
1991 ip4_ttl_inc (vlib_buffer_t * b, ip4_header_t * ip)
1995 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2000 checksum = ip->checksum - clib_host_to_net_u16 (0x0100);
2001 checksum += checksum >= 0xffff;
2003 ip->checksum = checksum;
2007 ASSERT (ip4_header_checksum_is_valid (ip));
2010 /* Decrement TTL & update checksum.
2011 Works either endian, so no need for byte swap. */
2012 static_always_inline void
2013 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2018 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2023 /* Input node should have reject packets with ttl 0. */
2024 ASSERT (ip->ttl > 0);
2026 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2027 checksum += checksum >= 0xffff;
2029 ip->checksum = checksum;
2034 * If the ttl drops below 1 when forwarding, generate
2037 if (PREDICT_FALSE (ttl <= 0))
2039 *error = IP4_ERROR_TIME_EXPIRED;
2040 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2041 icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2042 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2044 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2047 /* Verify checksum. */
2048 ASSERT (ip4_header_checksum_is_valid (ip) ||
2049 (vnet_buffer (b)->oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM));
2053 ip4_rewrite_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2054 vlib_frame_t *frame, int do_counters, int is_midchain,
2057 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2058 u32 *from = vlib_frame_vector_args (frame);
2059 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2060 u16 nexts[VLIB_FRAME_SIZE], *next;
2062 vlib_node_runtime_t *error_node =
2063 vlib_node_get_runtime (vm, ip4_input_node.index);
2065 n_left_from = frame->n_vectors;
2066 u32 thread_index = vm->thread_index;
2068 vlib_get_buffers (vm, from, bufs, n_left_from);
2069 clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2071 #if (CLIB_N_PREFETCHES >= 8)
2072 if (n_left_from >= 6)
2075 for (i = 2; i < 6; i++)
2076 vlib_prefetch_buffer_header (bufs[i], LOAD);
2081 while (n_left_from >= 8)
2083 const ip_adjacency_t *adj0, *adj1;
2084 ip4_header_t *ip0, *ip1;
2085 u32 rw_len0, error0, adj_index0;
2086 u32 rw_len1, error1, adj_index1;
2087 u32 tx_sw_if_index0, tx_sw_if_index1;
2092 vlib_prefetch_buffer_header (b[6], LOAD);
2093 vlib_prefetch_buffer_header (b[7], LOAD);
2096 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2097 adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2100 * pre-fetch the per-adjacency counters
2104 vlib_prefetch_combined_counter (&adjacency_counters,
2105 thread_index, adj_index0);
2106 vlib_prefetch_combined_counter (&adjacency_counters,
2107 thread_index, adj_index1);
2110 ip0 = vlib_buffer_get_current (b[0]);
2111 ip1 = vlib_buffer_get_current (b[1]);
2113 error0 = error1 = IP4_ERROR_NONE;
2115 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2116 ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2118 /* Rewrite packet header and updates lengths. */
2119 adj0 = adj_get (adj_index0);
2120 adj1 = adj_get (adj_index1);
2122 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2123 rw_len0 = adj0[0].rewrite_header.data_bytes;
2124 rw_len1 = adj1[0].rewrite_header.data_bytes;
2125 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2126 vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2128 p = vlib_buffer_get_current (b[2]);
2129 clib_prefetch_store (p - CLIB_CACHE_LINE_BYTES);
2130 clib_prefetch_load (p);
2132 p = vlib_buffer_get_current (b[3]);
2133 clib_prefetch_store (p - CLIB_CACHE_LINE_BYTES);
2134 clib_prefetch_load (p);
2136 /* Check MTU of outgoing interface. */
2137 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2138 u16 ip1_len = clib_net_to_host_u16 (ip1->length);
2140 if (b[0]->flags & VNET_BUFFER_F_GSO)
2141 ip0_len = gso_mtu_sz (b[0]);
2142 if (b[1]->flags & VNET_BUFFER_F_GSO)
2143 ip1_len = gso_mtu_sz (b[1]);
2145 ip4_mtu_check (b[0], ip0_len,
2146 adj0[0].rewrite_header.max_l3_packet_bytes,
2147 ip0->flags_and_fragment_offset &
2148 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2149 next + 0, is_midchain, &error0);
2150 ip4_mtu_check (b[1], ip1_len,
2151 adj1[0].rewrite_header.max_l3_packet_bytes,
2152 ip1->flags_and_fragment_offset &
2153 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2154 next + 1, is_midchain, &error1);
2158 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2159 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2160 IP4_ERROR_SAME_INTERFACE : error0);
2161 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2162 vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2163 IP4_ERROR_SAME_INTERFACE : error1);
2166 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2167 * to see the IP header */
2168 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2170 u32 next_index = adj0[0].rewrite_header.next_index;
2171 vlib_buffer_advance (b[0], -(word) rw_len0);
2173 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2174 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2177 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2178 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2181 adj0->ia_cfg_index);
2183 next[0] = next_index;
2185 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2190 b[0]->error = error_node->errors[error0];
2191 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2192 ip4_ttl_inc (b[0], ip0);
2194 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2196 u32 next_index = adj1[0].rewrite_header.next_index;
2197 vlib_buffer_advance (b[1], -(word) rw_len1);
2199 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2200 vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2203 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2204 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2207 adj1->ia_cfg_index);
2208 next[1] = next_index;
2210 vnet_calc_checksums_inline (vm, b[1], 1 /* is_ip4 */ ,
2215 b[1]->error = error_node->errors[error1];
2216 if (error1 == IP4_ERROR_MTU_EXCEEDED)
2217 ip4_ttl_inc (b[1], ip1);
2221 /* Guess we are only writing on ipv4 header. */
2222 vnet_rewrite_two_headers (adj0[0], adj1[0],
2223 ip0, ip1, sizeof (ip4_header_t));
2225 /* Guess we are only writing on simple Ethernet header. */
2226 vnet_rewrite_two_headers (adj0[0], adj1[0],
2227 ip0, ip1, sizeof (ethernet_header_t));
2231 if (error0 == IP4_ERROR_NONE)
2232 vlib_increment_combined_counter
2233 (&adjacency_counters,
2236 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2238 if (error1 == IP4_ERROR_NONE)
2239 vlib_increment_combined_counter
2240 (&adjacency_counters,
2243 vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2248 if (error0 == IP4_ERROR_NONE)
2249 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2250 if (error1 == IP4_ERROR_NONE)
2251 adj_midchain_fixup (vm, adj1, b[1], VNET_LINK_IP4);
2256 /* copy bytes from the IP address into the MAC rewrite */
2257 if (error0 == IP4_ERROR_NONE)
2258 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2259 adj0->rewrite_header.dst_mcast_offset,
2260 &ip0->dst_address.as_u32, (u8 *) ip0);
2261 if (error1 == IP4_ERROR_NONE)
2262 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2263 adj1->rewrite_header.dst_mcast_offset,
2264 &ip1->dst_address.as_u32, (u8 *) ip1);
2271 #elif (CLIB_N_PREFETCHES >= 4)
2274 while (n_left_from >= 1)
2276 ip_adjacency_t *adj0;
2278 u32 rw_len0, error0, adj_index0;
2279 u32 tx_sw_if_index0;
2282 /* Prefetch next iteration */
2283 if (PREDICT_TRUE (n_left_from >= 4))
2285 ip_adjacency_t *adj2;
2288 vlib_prefetch_buffer_header (b[3], LOAD);
2289 vlib_prefetch_buffer_data (b[2], LOAD);
2291 /* Prefetch adj->rewrite_header */
2292 adj_index2 = vnet_buffer (b[2])->ip.adj_index[VLIB_TX];
2293 adj2 = adj_get (adj_index2);
2295 CLIB_PREFETCH (p + CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES,
2299 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2302 * Prefetch the per-adjacency counters
2306 vlib_prefetch_combined_counter (&adjacency_counters,
2307 thread_index, adj_index0);
2310 ip0 = vlib_buffer_get_current (b[0]);
2312 error0 = IP4_ERROR_NONE;
2314 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2316 /* Rewrite packet header and updates lengths. */
2317 adj0 = adj_get (adj_index0);
2319 /* Rewrite header was prefetched. */
2320 rw_len0 = adj0[0].rewrite_header.data_bytes;
2321 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2323 /* Check MTU of outgoing interface. */
2324 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2326 if (b[0]->flags & VNET_BUFFER_F_GSO)
2327 ip0_len = gso_mtu_sz (b[0]);
2329 ip4_mtu_check (b[0], ip0_len,
2330 adj0[0].rewrite_header.max_l3_packet_bytes,
2331 ip0->flags_and_fragment_offset &
2332 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2333 next + 0, is_midchain, &error0);
2337 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2338 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2339 IP4_ERROR_SAME_INTERFACE : error0);
2342 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2343 * to see the IP header */
2344 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2346 u32 next_index = adj0[0].rewrite_header.next_index;
2347 vlib_buffer_advance (b[0], -(word) rw_len0);
2348 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2349 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2352 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2353 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2356 adj0->ia_cfg_index);
2357 next[0] = next_index;
2361 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2364 /* Guess we are only writing on ipv4 header. */
2365 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2368 /* Guess we are only writing on simple Ethernet header. */
2369 vnet_rewrite_one_header (adj0[0], ip0,
2370 sizeof (ethernet_header_t));
2373 * Bump the per-adjacency counters
2376 vlib_increment_combined_counter
2377 (&adjacency_counters,
2379 adj_index0, 1, vlib_buffer_length_in_chain (vm,
2383 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2386 /* copy bytes from the IP address into the MAC rewrite */
2387 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2388 adj0->rewrite_header.dst_mcast_offset,
2389 &ip0->dst_address.as_u32, (u8 *) ip0);
2393 b[0]->error = error_node->errors[error0];
2394 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2395 ip4_ttl_inc (b[0], ip0);
2404 while (n_left_from > 0)
2406 ip_adjacency_t *adj0;
2408 u32 rw_len0, adj_index0, error0;
2409 u32 tx_sw_if_index0;
2411 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2413 adj0 = adj_get (adj_index0);
2416 vlib_prefetch_combined_counter (&adjacency_counters,
2417 thread_index, adj_index0);
2419 ip0 = vlib_buffer_get_current (b[0]);
2421 error0 = IP4_ERROR_NONE;
2423 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2426 /* Update packet buffer attributes/set output interface. */
2427 rw_len0 = adj0[0].rewrite_header.data_bytes;
2428 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2430 /* Check MTU of outgoing interface. */
2431 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2432 if (b[0]->flags & VNET_BUFFER_F_GSO)
2433 ip0_len = gso_mtu_sz (b[0]);
2435 ip4_mtu_check (b[0], ip0_len,
2436 adj0[0].rewrite_header.max_l3_packet_bytes,
2437 ip0->flags_and_fragment_offset &
2438 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2439 next + 0, is_midchain, &error0);
2443 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2444 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2445 IP4_ERROR_SAME_INTERFACE : error0);
2448 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2449 * to see the IP header */
2450 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2452 u32 next_index = adj0[0].rewrite_header.next_index;
2453 vlib_buffer_advance (b[0], -(word) rw_len0);
2454 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2455 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2458 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2459 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2462 adj0->ia_cfg_index);
2463 next[0] = next_index;
2467 /* this acts on the packet that is about to be encapped */
2468 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2471 /* Guess we are only writing on ipv4 header. */
2472 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2475 /* Guess we are only writing on simple Ethernet header. */
2476 vnet_rewrite_one_header (adj0[0], ip0,
2477 sizeof (ethernet_header_t));
2480 vlib_increment_combined_counter
2481 (&adjacency_counters,
2482 thread_index, adj_index0, 1,
2483 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2486 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2489 /* copy bytes from the IP address into the MAC rewrite */
2490 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2491 adj0->rewrite_header.dst_mcast_offset,
2492 &ip0->dst_address.as_u32, (u8 *) ip0);
2496 b[0]->error = error_node->errors[error0];
2497 /* undo the TTL decrement - we'll be back to do it again */
2498 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2499 ip4_ttl_inc (b[0], ip0);
2508 /* Need to do trace after rewrites to pick up new packet data. */
2509 if (node->flags & VLIB_NODE_FLAG_TRACE)
2510 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2512 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2513 return frame->n_vectors;
2516 /** @brief IPv4 rewrite node.
2519 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2520 header checksum, fetch the ip adjacency, check the outbound mtu,
2521 apply the adjacency rewrite, and send pkts to the adjacency
2522 rewrite header's rewrite_next_index.
2524 @param vm vlib_main_t corresponding to the current thread
2525 @param node vlib_node_runtime_t
2526 @param frame vlib_frame_t whose contents should be dispatched
2528 @par Graph mechanics: buffer metadata, next index usage
2531 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2532 - the rewrite adjacency index
2533 - <code>adj->lookup_next_index</code>
2534 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2535 the packet will be dropped.
2536 - <code>adj->rewrite_header</code>
2537 - Rewrite string length, rewrite string, next_index
2540 - <code>b->current_data, b->current_length</code>
2541 - Updated net of applying the rewrite string
2543 <em>Next Indices:</em>
2544 - <code> adj->rewrite_header.next_index </code>
2548 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
2549 vlib_frame_t * frame)
2551 if (adj_are_counters_enabled ())
2552 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2554 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2557 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2558 vlib_node_runtime_t * node,
2559 vlib_frame_t * frame)
2561 if (adj_are_counters_enabled ())
2562 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2564 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2567 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2568 vlib_node_runtime_t * node,
2569 vlib_frame_t * frame)
2571 if (adj_are_counters_enabled ())
2572 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2574 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2577 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2578 vlib_node_runtime_t * node,
2579 vlib_frame_t * frame)
2581 if (adj_are_counters_enabled ())
2582 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2584 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2587 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2588 vlib_node_runtime_t * node,
2589 vlib_frame_t * frame)
2591 if (adj_are_counters_enabled ())
2592 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2594 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2598 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2599 .name = "ip4-rewrite",
2600 .vector_size = sizeof (u32),
2602 .format_trace = format_ip4_rewrite_trace,
2604 .n_next_nodes = IP4_REWRITE_N_NEXT,
2606 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2607 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2608 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2612 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2613 .name = "ip4-rewrite-bcast",
2614 .vector_size = sizeof (u32),
2616 .format_trace = format_ip4_rewrite_trace,
2617 .sibling_of = "ip4-rewrite",
2620 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2621 .name = "ip4-rewrite-mcast",
2622 .vector_size = sizeof (u32),
2624 .format_trace = format_ip4_rewrite_trace,
2625 .sibling_of = "ip4-rewrite",
2628 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2629 .name = "ip4-mcast-midchain",
2630 .vector_size = sizeof (u32),
2632 .format_trace = format_ip4_rewrite_trace,
2633 .sibling_of = "ip4-rewrite",
2636 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2637 .name = "ip4-midchain",
2638 .vector_size = sizeof (u32),
2639 .format_trace = format_ip4_rewrite_trace,
2640 .sibling_of = "ip4-rewrite",
2644 static clib_error_t *
2645 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2646 unformat_input_t * input,
2647 vlib_cli_command_t * cmd)
2651 u32 flow_hash_config = 0;
2654 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2656 if (unformat (input, "table %d", &table_id))
2658 #define _(a, b, v) \
2659 else if (unformat (input, #a)) \
2661 flow_hash_config |= v; \
2664 foreach_flow_hash_bit
2671 return clib_error_return (0, "unknown input `%U'",
2672 format_unformat_error, input);
2674 rv = ip_flow_hash_set (AF_IP4, table_id, flow_hash_config);
2680 case VNET_API_ERROR_NO_SUCH_FIB:
2681 return clib_error_return (0, "no such FIB table %d", table_id);
2684 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2692 * Configure the set of IPv4 fields used by the flow hash.
2695 * Example of how to set the flow hash on a given table:
2696 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2697 * Example of display the configured flow hash:
2698 * @cliexstart{show ip fib}
2699 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2702 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2703 * [0] [@0]: dpo-drop ip6
2706 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2707 * [0] [@0]: dpo-drop ip6
2710 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2711 * [0] [@0]: dpo-drop ip6
2714 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2715 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2718 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2719 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2720 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2721 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2722 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2725 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2726 * [0] [@0]: dpo-drop ip6
2727 * 255.255.255.255/32
2729 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2730 * [0] [@0]: dpo-drop ip6
2731 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2734 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2735 * [0] [@0]: dpo-drop ip6
2738 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2739 * [0] [@0]: dpo-drop ip6
2742 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2743 * [0] [@4]: ipv4-glean: af_packet0
2746 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2747 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2750 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2751 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2754 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2755 * [0] [@4]: ipv4-glean: af_packet1
2758 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2759 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2762 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2763 * [0] [@0]: dpo-drop ip6
2766 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2767 * [0] [@0]: dpo-drop ip6
2768 * 255.255.255.255/32
2770 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2771 * [0] [@0]: dpo-drop ip6
2775 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2777 .path = "set ip flow-hash",
2779 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2780 .function = set_ip_flow_hash_command_fn,
2784 #ifndef CLIB_MARCH_VARIANT
2786 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2789 vnet_main_t *vnm = vnet_get_main ();
2790 vnet_interface_main_t *im = &vnm->interface_main;
2791 ip4_main_t *ipm = &ip4_main;
2792 ip_lookup_main_t *lm = &ipm->lookup_main;
2793 vnet_classify_main_t *cm = &vnet_classify_main;
2794 ip4_address_t *if_addr;
2796 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2797 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2799 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2800 return VNET_API_ERROR_NO_SUCH_ENTRY;
2802 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2803 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2805 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2807 if (NULL != if_addr)
2809 fib_prefix_t pfx = {
2811 .fp_proto = FIB_PROTOCOL_IP4,
2812 .fp_addr.ip4 = *if_addr,
2816 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2820 if (table_index != (u32) ~ 0)
2822 dpo_id_t dpo = DPO_INVALID;
2827 classify_dpo_create (DPO_PROTO_IP4, table_index));
2829 fib_table_entry_special_dpo_add (fib_index,
2831 FIB_SOURCE_CLASSIFY,
2832 FIB_ENTRY_FLAG_NONE, &dpo);
2837 fib_table_entry_special_remove (fib_index,
2838 &pfx, FIB_SOURCE_CLASSIFY);
2846 static clib_error_t *
2847 set_ip_classify_command_fn (vlib_main_t * vm,
2848 unformat_input_t * input,
2849 vlib_cli_command_t * cmd)
2851 u32 table_index = ~0;
2852 int table_index_set = 0;
2853 u32 sw_if_index = ~0;
2856 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2858 if (unformat (input, "table-index %d", &table_index))
2859 table_index_set = 1;
2860 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2861 vnet_get_main (), &sw_if_index))
2867 if (table_index_set == 0)
2868 return clib_error_return (0, "classify table-index must be specified");
2870 if (sw_if_index == ~0)
2871 return clib_error_return (0, "interface / subif must be specified");
2873 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2880 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2881 return clib_error_return (0, "No such interface");
2883 case VNET_API_ERROR_NO_SUCH_ENTRY:
2884 return clib_error_return (0, "No such classifier table");
2890 * Assign a classification table to an interface. The classification
2891 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
2892 * commands. Once the table is create, use this command to filter packets
2896 * Example of how to assign a classification table to an interface:
2897 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
2900 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
2902 .path = "set ip classify",
2904 "set ip classify intfc <interface> table-index <classify-idx>",
2905 .function = set_ip_classify_command_fn,
2910 * fd.io coding-style-patch-verification: ON
2913 * eval: (c-set-style "gnu")