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>
59 #include <vnet/ip/ip4_forward.h>
60 #include <vnet/interface_output.h>
61 #include <vnet/classify/vnet_classify.h>
63 /** @brief IPv4 lookup node.
66 This is the main IPv4 lookup dispatch node.
68 @param vm vlib_main_t corresponding to the current thread
69 @param node vlib_node_runtime_t
70 @param frame vlib_frame_t whose contents should be dispatched
72 @par Graph mechanics: buffer metadata, next index usage
75 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
76 - Indicates the @c sw_if_index value of the interface that the
77 packet was received on.
78 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
79 - When the value is @c ~0 then the node performs a longest prefix
80 match (LPM) for the packet destination address in the FIB attached
81 to the receive interface.
82 - Otherwise perform LPM for the packet destination address in the
83 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
84 value (0, 1, ...) and not a VRF id.
87 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
88 - The lookup result adjacency index.
91 - Dispatches the packet to the node index found in
92 ip_adjacency_t @c adj->lookup_next_index
93 (where @c adj is the lookup result adjacency).
95 VLIB_NODE_FN (ip4_lookup_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
98 return ip4_lookup_inline (vm, node, frame);
101 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
104 VLIB_REGISTER_NODE (ip4_lookup_node) =
106 .name = "ip4-lookup",
107 .vector_size = sizeof (u32),
108 .format_trace = format_ip4_lookup_trace,
109 .n_next_nodes = IP_LOOKUP_N_NEXT,
110 .next_nodes = IP4_LOOKUP_NEXT_NODES,
114 VLIB_NODE_FN (ip4_load_balance_node) (vlib_main_t * vm,
115 vlib_node_runtime_t * node,
116 vlib_frame_t * frame)
118 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
120 u32 thread_index = vm->thread_index;
121 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
122 u16 nexts[VLIB_FRAME_SIZE], *next;
124 from = vlib_frame_vector_args (frame);
125 n_left = frame->n_vectors;
128 vlib_get_buffers (vm, from, bufs, n_left);
132 const load_balance_t *lb0, *lb1;
133 const ip4_header_t *ip0, *ip1;
134 u32 lbi0, hc0, lbi1, hc1;
135 const dpo_id_t *dpo0, *dpo1;
137 /* Prefetch next iteration. */
139 vlib_prefetch_buffer_header (b[2], LOAD);
140 vlib_prefetch_buffer_header (b[3], LOAD);
142 CLIB_PREFETCH (b[2]->data, sizeof (ip0[0]), LOAD);
143 CLIB_PREFETCH (b[3]->data, sizeof (ip0[0]), LOAD);
146 ip0 = vlib_buffer_get_current (b[0]);
147 ip1 = vlib_buffer_get_current (b[1]);
148 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
149 lbi1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
151 lb0 = load_balance_get (lbi0);
152 lb1 = load_balance_get (lbi1);
155 * this node is for via FIBs we can re-use the hash value from the
156 * to node if present.
157 * We don't want to use the same hash value at each level in the recursion
158 * graph as that would lead to polarisation
162 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
164 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
166 hc0 = vnet_buffer (b[0])->ip.flow_hash =
167 vnet_buffer (b[0])->ip.flow_hash >> 1;
171 hc0 = vnet_buffer (b[0])->ip.flow_hash =
172 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
174 dpo0 = load_balance_get_fwd_bucket
175 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
179 dpo0 = load_balance_get_bucket_i (lb0, 0);
181 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
183 if (PREDICT_TRUE (vnet_buffer (b[1])->ip.flow_hash))
185 hc1 = vnet_buffer (b[1])->ip.flow_hash =
186 vnet_buffer (b[1])->ip.flow_hash >> 1;
190 hc1 = vnet_buffer (b[1])->ip.flow_hash =
191 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
193 dpo1 = load_balance_get_fwd_bucket
194 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
198 dpo1 = load_balance_get_bucket_i (lb1, 0);
201 next[0] = dpo0->dpoi_next_node;
202 next[1] = dpo1->dpoi_next_node;
204 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
205 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
207 vlib_increment_combined_counter
208 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
209 vlib_increment_combined_counter
210 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, b[1]));
219 const load_balance_t *lb0;
220 const ip4_header_t *ip0;
221 const dpo_id_t *dpo0;
224 ip0 = vlib_buffer_get_current (b[0]);
225 lbi0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
227 lb0 = load_balance_get (lbi0);
230 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
232 if (PREDICT_TRUE (vnet_buffer (b[0])->ip.flow_hash))
234 hc0 = vnet_buffer (b[0])->ip.flow_hash =
235 vnet_buffer (b[0])->ip.flow_hash >> 1;
239 hc0 = vnet_buffer (b[0])->ip.flow_hash =
240 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
242 dpo0 = load_balance_get_fwd_bucket
243 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
247 dpo0 = load_balance_get_bucket_i (lb0, 0);
250 next[0] = dpo0->dpoi_next_node;
251 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
253 vlib_increment_combined_counter
254 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, b[0]));
261 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
262 if (node->flags & VLIB_NODE_FLAG_TRACE)
263 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
265 return frame->n_vectors;
269 VLIB_REGISTER_NODE (ip4_load_balance_node) =
271 .name = "ip4-load-balance",
272 .vector_size = sizeof (u32),
273 .sibling_of = "ip4-lookup",
274 .format_trace = format_ip4_lookup_trace,
278 #ifndef CLIB_MARCH_VARIANT
279 /* get first interface address */
281 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
282 ip_interface_address_t ** result_ia)
284 ip_lookup_main_t *lm = &im->lookup_main;
285 ip_interface_address_t *ia = 0;
286 ip4_address_t *result = 0;
289 foreach_ip_interface_address
290 (lm, ia, sw_if_index,
291 1 /* honor unnumbered */ ,
294 ip_interface_address_get_address (lm, ia);
300 *result_ia = result ? ia : 0;
306 ip4_add_subnet_bcast_route (u32 fib_index,
310 vnet_sw_interface_flags_t iflags;
312 iflags = vnet_sw_interface_get_flags(vnet_get_main(), sw_if_index);
314 fib_table_entry_special_remove(fib_index,
316 FIB_SOURCE_INTERFACE);
318 if (iflags & VNET_SW_INTERFACE_FLAG_DIRECTED_BCAST)
320 fib_table_entry_update_one_path (fib_index, pfx,
321 FIB_SOURCE_INTERFACE,
324 /* No next-hop address */
330 // no out-label stack
332 FIB_ROUTE_PATH_FLAG_NONE);
336 fib_table_entry_special_add(fib_index,
338 FIB_SOURCE_INTERFACE,
339 (FIB_ENTRY_FLAG_DROP |
340 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
345 ip4_add_interface_prefix_routes (ip4_main_t *im,
348 ip_interface_address_t * a)
350 ip_lookup_main_t *lm = &im->lookup_main;
351 ip_interface_prefix_t *if_prefix;
352 ip4_address_t *address = ip_interface_address_get_address (lm, a);
354 ip_interface_prefix_key_t key = {
356 .fp_len = a->address_length,
357 .fp_proto = FIB_PROTOCOL_IP4,
358 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[a->address_length],
360 .sw_if_index = sw_if_index,
363 fib_prefix_t pfx_special = {
364 .fp_proto = FIB_PROTOCOL_IP4,
367 /* If prefix already set on interface, just increment ref count & return */
368 if_prefix = ip_get_interface_prefix (lm, &key);
371 if_prefix->ref_count += 1;
375 /* New prefix - allocate a pool entry, initialize it, add to the hash */
376 pool_get (lm->if_prefix_pool, if_prefix);
377 if_prefix->ref_count = 1;
378 if_prefix->src_ia_index = a - lm->if_address_pool;
379 clib_memcpy (&if_prefix->key, &key, sizeof (key));
380 mhash_set (&lm->prefix_to_if_prefix_index, &key,
381 if_prefix - lm->if_prefix_pool, 0 /* old value */);
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 /* length <= 30 - add glean, drop first address, maybe drop bcast address */
403 if (a->address_length <= 30)
405 /* set a drop route for the base address of the prefix */
406 pfx_special.fp_len = 32;
407 pfx_special.fp_addr.ip4.as_u32 =
408 address->as_u32 & im->fib_masks[a->address_length];
410 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
411 fib_table_entry_special_add (fib_index, &pfx_special,
412 FIB_SOURCE_INTERFACE,
413 (FIB_ENTRY_FLAG_DROP |
414 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
416 /* set a route for the broadcast address of the prefix */
417 pfx_special.fp_len = 32;
418 pfx_special.fp_addr.ip4.as_u32 =
419 address->as_u32 | ~im->fib_masks[a->address_length];
420 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
421 ip4_add_subnet_bcast_route (fib_index, &pfx_special, sw_if_index);
425 /* length == 31 - add an attached route for the other address */
426 else if (a->address_length == 31)
428 pfx_special.fp_len = 32;
429 pfx_special.fp_addr.ip4.as_u32 =
430 address->as_u32 ^ clib_host_to_net_u32(1);
432 fib_table_entry_update_one_path (fib_index, &pfx_special,
433 FIB_SOURCE_INTERFACE,
434 (FIB_ENTRY_FLAG_ATTACHED),
436 &pfx_special.fp_addr,
438 /* invalid FIB index */
442 FIB_ROUTE_PATH_FLAG_NONE);
447 ip4_add_interface_routes (u32 sw_if_index,
448 ip4_main_t * im, u32 fib_index,
449 ip_interface_address_t * a)
451 ip_lookup_main_t *lm = &im->lookup_main;
452 ip4_address_t *address = ip_interface_address_get_address (lm, a);
455 .fp_proto = FIB_PROTOCOL_IP4,
456 .fp_addr.ip4 = *address,
459 /* set special routes for the prefix if needed */
460 ip4_add_interface_prefix_routes (im, sw_if_index, fib_index, a);
462 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
464 u32 classify_table_index =
465 lm->classify_table_index_by_sw_if_index[sw_if_index];
466 if (classify_table_index != (u32) ~ 0)
468 dpo_id_t dpo = DPO_INVALID;
473 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
475 fib_table_entry_special_dpo_add (fib_index,
478 FIB_ENTRY_FLAG_NONE, &dpo);
483 fib_table_entry_update_one_path (fib_index, &pfx,
484 FIB_SOURCE_INTERFACE,
485 (FIB_ENTRY_FLAG_CONNECTED |
486 FIB_ENTRY_FLAG_LOCAL),
493 FIB_ROUTE_PATH_FLAG_NONE);
497 ip4_del_interface_prefix_routes (ip4_main_t * im,
500 ip4_address_t * address,
503 ip_lookup_main_t *lm = &im->lookup_main;
504 ip_interface_prefix_t *if_prefix;
506 ip_interface_prefix_key_t key = {
508 .fp_len = address_length,
509 .fp_proto = FIB_PROTOCOL_IP4,
510 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[address_length],
512 .sw_if_index = sw_if_index,
515 fib_prefix_t pfx_special = {
517 .fp_proto = FIB_PROTOCOL_IP4,
520 if_prefix = ip_get_interface_prefix (lm, &key);
523 clib_warning ("Prefix not found while deleting %U",
524 format_ip4_address_and_length, address, address_length);
528 if_prefix->ref_count -= 1;
531 * Routes need to be adjusted if deleting last intf addr in prefix
533 * We're done now otherwise
535 if (if_prefix->ref_count > 0)
538 /* length <= 30, delete glean route, first address, last address */
539 if (address_length <= 30)
541 /* Less work to do in FIB if we remove the covered /32s first */
543 /* first address in prefix */
544 pfx_special.fp_addr.ip4.as_u32 =
545 address->as_u32 & im->fib_masks[address_length];
546 pfx_special.fp_len = 32;
548 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
549 fib_table_entry_special_remove (fib_index,
551 FIB_SOURCE_INTERFACE);
553 /* prefix broadcast address */
554 pfx_special.fp_addr.ip4.as_u32 =
555 address->as_u32 | ~im->fib_masks[address_length];
556 pfx_special.fp_len = 32;
558 if (pfx_special.fp_addr.ip4.as_u32 != address->as_u32)
559 fib_table_entry_special_remove (fib_index,
561 FIB_SOURCE_INTERFACE);
563 else if (address_length == 31)
565 /* length == 31, delete attached route for the other address */
566 pfx_special.fp_addr.ip4.as_u32 =
567 address->as_u32 ^ clib_host_to_net_u32(1);
569 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
572 /* remove glean route for prefix */
573 pfx_special.fp_addr.ip4 = *address;
574 pfx_special.fp_len = address_length;
575 fib_table_entry_delete (fib_index, &pfx_special, FIB_SOURCE_INTERFACE);
577 mhash_unset (&lm->prefix_to_if_prefix_index, &key, 0 /* old_value */);
578 pool_put (lm->if_prefix_pool, if_prefix);
582 ip4_del_interface_routes (u32 sw_if_index,
585 ip4_address_t * address, u32 address_length)
589 .fp_proto = FIB_PROTOCOL_IP4,
590 .fp_addr.ip4 = *address,
593 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
595 ip4_del_interface_prefix_routes (im, sw_if_index, fib_index,
596 address, address_length);
599 #ifndef CLIB_MARCH_VARIANT
601 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
603 ip4_main_t *im = &ip4_main;
604 vnet_main_t *vnm = vnet_get_main ();
605 vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
607 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
610 * enable/disable only on the 1<->0 transition
614 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
619 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
620 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
623 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
627 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
628 sw_if_index, !is_enable, 0, 0);
632 else if (hi->l3_if_count)
636 ip4_enable_disable_interface_callback_t *cb;
637 vec_foreach (cb, im->enable_disable_interface_callbacks)
638 cb->function (im, cb->function_opaque, sw_if_index, is_enable);
642 static clib_error_t *
643 ip4_add_del_interface_address_internal (vlib_main_t * vm,
645 ip4_address_t * address,
646 u32 address_length, u32 is_del)
648 vnet_main_t *vnm = vnet_get_main ();
649 ip4_main_t *im = &ip4_main;
650 ip_lookup_main_t *lm = &im->lookup_main;
651 clib_error_t *error = 0;
652 u32 if_address_index;
653 ip4_address_fib_t ip4_af, *addr_fib = 0;
655 /* local0 interface doesn't support IP addressing */
656 if (sw_if_index == 0)
659 clib_error_create ("local0 interface doesn't support IP addressing");
662 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
663 ip4_addr_fib_init (&ip4_af, address,
664 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
665 vec_add1 (addr_fib, ip4_af);
668 * there is no support for adj-fib handling in the presence of overlapping
669 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
675 /* When adding an address check that it does not conflict
676 with an existing address on any interface in this table. */
677 ip_interface_address_t *ia;
678 vnet_sw_interface_t *sif;
680 pool_foreach (sif, vnm->interface_main.sw_interfaces)
682 if (im->fib_index_by_sw_if_index[sw_if_index] ==
683 im->fib_index_by_sw_if_index[sif->sw_if_index])
685 foreach_ip_interface_address
686 (&im->lookup_main, ia, sif->sw_if_index,
687 0 /* honor unnumbered */ ,
690 ip_interface_address_get_address
691 (&im->lookup_main, ia);
693 if (ip4_destination_matches_route
694 (im, address, x, ia->address_length) ||
695 ip4_destination_matches_route (im,
700 /* an intf may have >1 addr from the same prefix */
701 if ((sw_if_index == sif->sw_if_index) &&
702 (ia->address_length == address_length) &&
703 (x->as_u32 != address->as_u32))
706 if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
707 /* if the address we're comparing against is stale
708 * then the CP has not added this one back yet, maybe
709 * it never will, so we have to assume it won't and
710 * ignore it. if it does add it back, then it will fail
711 * because this one is now present */
714 /* error if the length or intf was different */
715 vnm->api_errno = VNET_API_ERROR_ADDRESS_IN_USE;
717 error = clib_error_create
718 ("failed to add %U on %U which conflicts with %U for interface %U",
719 format_ip4_address_and_length, address,
721 format_vnet_sw_if_index_name, vnm,
723 format_ip4_address_and_length, x,
725 format_vnet_sw_if_index_name, vnm,
735 if_address_index = ip_interface_address_find (lm, addr_fib, address_length);
739 if (~0 == if_address_index)
741 vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
742 error = clib_error_create ("%U not found for interface %U",
743 lm->format_address_and_length,
744 addr_fib, address_length,
745 format_vnet_sw_if_index_name, vnm,
750 error = ip_interface_address_del (lm, vnm, if_address_index, addr_fib,
751 address_length, sw_if_index);
757 if (~0 != if_address_index)
759 ip_interface_address_t *ia;
761 ia = pool_elt_at_index (lm->if_address_pool, if_address_index);
763 if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
765 if (ia->sw_if_index == sw_if_index)
767 /* re-adding an address during the replace action.
768 * consdier this the update. clear the flag and
770 ia->flags &= ~IP_INTERFACE_ADDRESS_FLAG_STALE;
775 /* The prefix is moving from one interface to another.
776 * delete the stale and add the new */
777 ip4_add_del_interface_address_internal (vm,
782 error = ip_interface_address_add (lm, sw_if_index,
783 addr_fib, address_length,
789 vnm->api_errno = VNET_API_ERROR_DUPLICATE_IF_ADDRESS;
790 error = clib_error_create
791 ("Prefix %U already found on interface %U",
792 lm->format_address_and_length, addr_fib, address_length,
793 format_vnet_sw_if_index_name, vnm, ia->sw_if_index);
797 error = ip_interface_address_add (lm, sw_if_index,
798 addr_fib, address_length,
805 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
806 ip4_mfib_interface_enable_disable (sw_if_index, !is_del);
808 /* intf addr routes are added/deleted on admin up/down */
809 if (vnet_sw_interface_is_admin_up (vnm, sw_if_index))
812 ip4_del_interface_routes (sw_if_index,
813 im, ip4_af.fib_index, address,
816 ip4_add_interface_routes (sw_if_index,
817 im, ip4_af.fib_index,
819 (lm->if_address_pool, if_address_index));
822 ip4_add_del_interface_address_callback_t *cb;
823 vec_foreach (cb, im->add_del_interface_address_callbacks)
824 cb->function (im, cb->function_opaque, sw_if_index,
825 address, address_length, if_address_index, is_del);
833 ip4_add_del_interface_address (vlib_main_t * vm,
835 ip4_address_t * address,
836 u32 address_length, u32 is_del)
838 return ip4_add_del_interface_address_internal
839 (vm, sw_if_index, address, address_length, is_del);
843 ip4_directed_broadcast (u32 sw_if_index, u8 enable)
845 ip_interface_address_t *ia;
851 * when directed broadcast is enabled, the subnet braodcast route will forward
852 * packets using an adjacency with a broadcast MAC. otherwise it drops
855 foreach_ip_interface_address(&im->lookup_main, ia,
858 if (ia->address_length <= 30)
862 ipa = ip_interface_address_get_address (&im->lookup_main, ia);
866 .fp_proto = FIB_PROTOCOL_IP4,
868 .ip4.as_u32 = (ipa->as_u32 | ~im->fib_masks[ia->address_length]),
872 ip4_add_subnet_bcast_route
873 (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
882 static clib_error_t *
883 ip4_sw_interface_admin_up_down (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
885 ip4_main_t *im = &ip4_main;
886 ip_interface_address_t *ia;
888 u32 is_admin_up, fib_index;
890 /* Fill in lookup tables with default table (0). */
891 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
893 vec_validate_init_empty (im->
894 lookup_main.if_address_pool_index_by_sw_if_index,
897 is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
899 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
902 foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
903 0 /* honor unnumbered */,
905 a = ip_interface_address_get_address (&im->lookup_main, ia);
907 ip4_add_interface_routes (sw_if_index,
911 ip4_del_interface_routes (sw_if_index,
913 a, ia->address_length);
920 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip4_sw_interface_admin_up_down);
922 /* Built-in ip4 unicast rx feature path definition */
924 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
926 .arc_name = "ip4-unicast",
927 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
928 .last_in_arc = "ip4-lookup",
929 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
932 VNET_FEATURE_INIT (ip4_flow_classify, static) =
934 .arc_name = "ip4-unicast",
935 .node_name = "ip4-flow-classify",
936 .runs_before = VNET_FEATURES ("ip4-inacl"),
939 VNET_FEATURE_INIT (ip4_inacl, static) =
941 .arc_name = "ip4-unicast",
942 .node_name = "ip4-inacl",
943 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
946 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
948 .arc_name = "ip4-unicast",
949 .node_name = "ip4-source-and-port-range-check-rx",
950 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
953 VNET_FEATURE_INIT (ip4_policer_classify, static) =
955 .arc_name = "ip4-unicast",
956 .node_name = "ip4-policer-classify",
957 .runs_before = VNET_FEATURES ("ipsec4-input-feature"),
960 VNET_FEATURE_INIT (ip4_ipsec, static) =
962 .arc_name = "ip4-unicast",
963 .node_name = "ipsec4-input-feature",
964 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
967 VNET_FEATURE_INIT (ip4_vpath, static) =
969 .arc_name = "ip4-unicast",
970 .node_name = "vpath-input-ip4",
971 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
974 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
976 .arc_name = "ip4-unicast",
977 .node_name = "ip4-vxlan-bypass",
978 .runs_before = VNET_FEATURES ("ip4-lookup"),
981 VNET_FEATURE_INIT (ip4_not_enabled, static) =
983 .arc_name = "ip4-unicast",
984 .node_name = "ip4-not-enabled",
985 .runs_before = VNET_FEATURES ("ip4-lookup"),
988 VNET_FEATURE_INIT (ip4_lookup, static) =
990 .arc_name = "ip4-unicast",
991 .node_name = "ip4-lookup",
992 .runs_before = 0, /* not before any other features */
995 /* Built-in ip4 multicast rx feature path definition */
996 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
998 .arc_name = "ip4-multicast",
999 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1000 .last_in_arc = "ip4-mfib-forward-lookup",
1001 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1004 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1006 .arc_name = "ip4-multicast",
1007 .node_name = "vpath-input-ip4",
1008 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1011 VNET_FEATURE_INIT (ip4_mc_not_enabled, static) =
1013 .arc_name = "ip4-multicast",
1014 .node_name = "ip4-not-enabled",
1015 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1018 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1020 .arc_name = "ip4-multicast",
1021 .node_name = "ip4-mfib-forward-lookup",
1022 .runs_before = 0, /* last feature */
1025 /* Source and port-range check ip4 tx feature path definition */
1026 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1028 .arc_name = "ip4-output",
1029 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain", "ip4-dvr-dpo"),
1030 .last_in_arc = "interface-output",
1031 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1034 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1036 .arc_name = "ip4-output",
1037 .node_name = "ip4-source-and-port-range-check-tx",
1038 .runs_before = VNET_FEATURES ("ip4-outacl"),
1041 VNET_FEATURE_INIT (ip4_outacl, static) =
1043 .arc_name = "ip4-output",
1044 .node_name = "ip4-outacl",
1045 .runs_before = VNET_FEATURES ("ipsec4-output-feature"),
1048 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1050 .arc_name = "ip4-output",
1051 .node_name = "ipsec4-output-feature",
1052 .runs_before = VNET_FEATURES ("interface-output"),
1055 /* Built-in ip4 tx feature path definition */
1056 VNET_FEATURE_INIT (ip4_interface_output, static) =
1058 .arc_name = "ip4-output",
1059 .node_name = "interface-output",
1060 .runs_before = 0, /* not before any other features */
1064 static clib_error_t *
1065 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1067 ip4_main_t *im = &ip4_main;
1069 /* Fill in lookup tables with default table (0). */
1070 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1071 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1075 ip4_main_t *im4 = &ip4_main;
1076 ip_lookup_main_t *lm4 = &im4->lookup_main;
1077 ip_interface_address_t *ia = 0;
1078 ip4_address_t *address;
1079 vlib_main_t *vm = vlib_get_main ();
1081 vnet_sw_interface_update_unnumbered (sw_if_index, ~0, 0);
1083 foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
1085 address = ip_interface_address_get_address (lm4, ia);
1086 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1089 ip4_mfib_interface_enable_disable (sw_if_index, 0);
1092 vnet_feature_enable_disable ("ip4-unicast", "ip4-not-enabled", sw_if_index,
1095 vnet_feature_enable_disable ("ip4-multicast", "ip4-not-enabled",
1096 sw_if_index, is_add, 0, 0);
1098 return /* no error */ 0;
1101 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1103 /* Global IP4 main. */
1104 #ifndef CLIB_MARCH_VARIANT
1105 ip4_main_t ip4_main;
1106 #endif /* CLIB_MARCH_VARIANT */
1108 static clib_error_t *
1109 ip4_lookup_init (vlib_main_t * vm)
1111 ip4_main_t *im = &ip4_main;
1112 clib_error_t *error;
1115 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1117 if ((error = vlib_call_init_function (vm, ip4_mtrie_module_init)))
1119 if ((error = vlib_call_init_function (vm, fib_module_init)))
1121 if ((error = vlib_call_init_function (vm, mfib_module_init)))
1124 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1129 m = pow2_mask (i) << (32 - i);
1132 im->fib_masks[i] = clib_host_to_net_u32 (m);
1135 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1137 /* Create FIB with index 0 and table id of 0. */
1138 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1139 FIB_SOURCE_DEFAULT_ROUTE);
1140 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1141 MFIB_SOURCE_DEFAULT_ROUTE);
1145 pn = pg_get_node (ip4_lookup_node.index);
1146 pn->unformat_edit = unformat_pg_ip4_header;
1150 ethernet_arp_header_t h;
1152 clib_memset (&h, 0, sizeof (h));
1154 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1155 #define _8(f,v) h.f = v;
1156 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1157 _16 (l3_type, ETHERNET_TYPE_IP4);
1158 _8 (n_l2_address_bytes, 6);
1159 _8 (n_l3_address_bytes, 4);
1160 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1164 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1167 /* alloc chunk size */ 8,
1174 VLIB_INIT_FUNCTION (ip4_lookup_init);
1178 /* Adjacency taken. */
1183 /* Packet data, possibly *after* rewrite. */
1184 u8 packet_data[64 - 1 * sizeof (u32)];
1186 ip4_forward_next_trace_t;
1188 #ifndef CLIB_MARCH_VARIANT
1190 format_ip4_forward_next_trace (u8 * s, va_list * args)
1192 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1193 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1194 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1195 u32 indent = format_get_indent (s);
1196 s = format (s, "%U%U",
1197 format_white_space, indent,
1198 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1204 format_ip4_lookup_trace (u8 * s, va_list * args)
1206 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1207 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1208 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1209 u32 indent = format_get_indent (s);
1211 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1212 t->fib_index, t->dpo_index, t->flow_hash);
1213 s = format (s, "\n%U%U",
1214 format_white_space, indent,
1215 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1220 format_ip4_rewrite_trace (u8 * s, va_list * args)
1222 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1223 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1224 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1225 u32 indent = format_get_indent (s);
1227 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1228 t->fib_index, t->dpo_index, format_ip_adjacency,
1229 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1230 s = format (s, "\n%U%U",
1231 format_white_space, indent,
1232 format_ip_adjacency_packet_data,
1233 t->packet_data, sizeof (t->packet_data));
1237 #ifndef CLIB_MARCH_VARIANT
1238 /* Common trace function for all ip4-forward next nodes. */
1240 ip4_forward_next_trace (vlib_main_t * vm,
1241 vlib_node_runtime_t * node,
1242 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1245 ip4_main_t *im = &ip4_main;
1247 n_left = frame->n_vectors;
1248 from = vlib_frame_vector_args (frame);
1253 vlib_buffer_t *b0, *b1;
1254 ip4_forward_next_trace_t *t0, *t1;
1256 /* Prefetch next iteration. */
1257 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1258 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1263 b0 = vlib_get_buffer (vm, bi0);
1264 b1 = vlib_get_buffer (vm, bi1);
1266 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1268 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1269 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1270 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1272 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1273 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1274 vec_elt (im->fib_index_by_sw_if_index,
1275 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1277 clib_memcpy_fast (t0->packet_data,
1278 vlib_buffer_get_current (b0),
1279 sizeof (t0->packet_data));
1281 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1283 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1284 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1285 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1287 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1288 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1289 vec_elt (im->fib_index_by_sw_if_index,
1290 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1291 clib_memcpy_fast (t1->packet_data, vlib_buffer_get_current (b1),
1292 sizeof (t1->packet_data));
1302 ip4_forward_next_trace_t *t0;
1306 b0 = vlib_get_buffer (vm, bi0);
1308 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1310 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1311 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1312 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1314 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1315 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1316 vec_elt (im->fib_index_by_sw_if_index,
1317 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1318 clib_memcpy_fast (t0->packet_data, vlib_buffer_get_current (b0),
1319 sizeof (t0->packet_data));
1326 /* Compute TCP/UDP/ICMP4 checksum in software. */
1328 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1332 u32 ip_header_length, payload_length_host_byte_order;
1334 /* Initialize checksum with ip header. */
1335 ip_header_length = ip4_header_bytes (ip0);
1336 payload_length_host_byte_order =
1337 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1339 clib_host_to_net_u32 (payload_length_host_byte_order +
1340 (ip0->protocol << 16));
1342 if (BITS (uword) == 32)
1345 ip_csum_with_carry (sum0,
1346 clib_mem_unaligned (&ip0->src_address, u32));
1348 ip_csum_with_carry (sum0,
1349 clib_mem_unaligned (&ip0->dst_address, u32));
1353 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1355 return ip_calculate_l4_checksum (vm, p0, sum0,
1356 payload_length_host_byte_order, (u8 *) ip0,
1357 ip_header_length, NULL);
1361 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1363 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1367 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1368 || ip0->protocol == IP_PROTOCOL_UDP);
1370 udp0 = (void *) (ip0 + 1);
1371 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1373 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1374 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1378 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1380 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1381 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1388 VNET_FEATURE_ARC_INIT (ip4_local) =
1390 .arc_name = "ip4-local",
1391 .start_nodes = VNET_FEATURES ("ip4-local"),
1392 .last_in_arc = "ip4-local-end-of-arc",
1397 ip4_local_l4_csum_validate (vlib_main_t * vm, vlib_buffer_t * p,
1398 ip4_header_t * ip, u8 is_udp, u8 * error,
1402 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1403 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1407 u32 ip_len, udp_len;
1409 udp = ip4_next_header (ip);
1410 /* Verify UDP length. */
1411 ip_len = clib_net_to_host_u16 (ip->length);
1412 udp_len = clib_net_to_host_u16 (udp->length);
1414 len_diff = ip_len - udp_len;
1415 *good_tcp_udp &= len_diff >= 0;
1416 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1420 #define ip4_local_csum_is_offloaded(_b) \
1421 ((_b->flags & VNET_BUFFER_F_OFFLOAD) && \
1422 (vnet_buffer2 (_b)->oflags & \
1423 (VNET_BUFFER_OFFLOAD_F_TCP_CKSUM | VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)))
1425 #define ip4_local_need_csum_check(is_tcp_udp, _b) \
1426 (is_tcp_udp && !(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \
1427 || ip4_local_csum_is_offloaded (_b)))
1429 #define ip4_local_csum_is_valid(_b) \
1430 (_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \
1431 || (ip4_local_csum_is_offloaded (_b))) != 0
1434 ip4_local_check_l4_csum (vlib_main_t * vm, vlib_buffer_t * b,
1435 ip4_header_t * ih, u8 * error)
1437 u8 is_udp, is_tcp_udp, good_tcp_udp;
1439 is_udp = ih->protocol == IP_PROTOCOL_UDP;
1440 is_tcp_udp = is_udp || ih->protocol == IP_PROTOCOL_TCP;
1442 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp, b)))
1443 ip4_local_l4_csum_validate (vm, b, ih, is_udp, error, &good_tcp_udp);
1445 good_tcp_udp = ip4_local_csum_is_valid (b);
1447 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1448 *error = (is_tcp_udp && !good_tcp_udp
1449 ? IP4_ERROR_TCP_CHECKSUM + is_udp : *error);
1453 ip4_local_check_l4_csum_x2 (vlib_main_t * vm, vlib_buffer_t ** b,
1454 ip4_header_t ** ih, u8 * error)
1456 u8 is_udp[2], is_tcp_udp[2], good_tcp_udp[2];
1458 is_udp[0] = ih[0]->protocol == IP_PROTOCOL_UDP;
1459 is_udp[1] = ih[1]->protocol == IP_PROTOCOL_UDP;
1461 is_tcp_udp[0] = is_udp[0] || ih[0]->protocol == IP_PROTOCOL_TCP;
1462 is_tcp_udp[1] = is_udp[1] || ih[1]->protocol == IP_PROTOCOL_TCP;
1464 good_tcp_udp[0] = ip4_local_csum_is_valid (b[0]);
1465 good_tcp_udp[1] = ip4_local_csum_is_valid (b[1]);
1467 if (PREDICT_FALSE (ip4_local_need_csum_check (is_tcp_udp[0], b[0])
1468 || ip4_local_need_csum_check (is_tcp_udp[1], b[1])))
1471 ip4_local_l4_csum_validate (vm, b[0], ih[0], is_udp[0], &error[0],
1474 ip4_local_l4_csum_validate (vm, b[1], ih[1], is_udp[1], &error[1],
1478 error[0] = (is_tcp_udp[0] && !good_tcp_udp[0] ?
1479 IP4_ERROR_TCP_CHECKSUM + is_udp[0] : error[0]);
1480 error[1] = (is_tcp_udp[1] && !good_tcp_udp[1] ?
1481 IP4_ERROR_TCP_CHECKSUM + is_udp[1] : error[1]);
1485 ip4_local_set_next_and_error (vlib_node_runtime_t * error_node,
1486 vlib_buffer_t * b, u16 * next, u8 error,
1487 u8 head_of_feature_arc)
1489 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1492 *next = error != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : *next;
1493 b->error = error ? error_node->errors[error] : 0;
1494 if (head_of_feature_arc)
1497 if (PREDICT_TRUE (error == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1499 vnet_feature_arc_start (arc_index,
1500 vnet_buffer (b)->sw_if_index[VLIB_RX],
1513 } ip4_local_last_check_t;
1516 ip4_local_check_src (vlib_buffer_t * b, ip4_header_t * ip0,
1517 ip4_local_last_check_t * last_check, u8 * error0)
1519 ip4_fib_mtrie_leaf_t leaf0;
1520 ip4_fib_mtrie_t *mtrie0;
1521 const dpo_id_t *dpo0;
1522 load_balance_t *lb0;
1525 vnet_buffer (b)->ip.fib_index =
1526 vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0 ?
1527 vnet_buffer (b)->sw_if_index[VLIB_TX] : vnet_buffer (b)->ip.fib_index;
1530 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1531 * adjacency for the destination address (the local interface address).
1532 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1533 * adjacency for the source address (the remote sender's address)
1535 if (PREDICT_TRUE (last_check->src.as_u32 != ip0->src_address.as_u32) ||
1538 mtrie0 = &ip4_fib_get (vnet_buffer (b)->ip.fib_index)->mtrie;
1539 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1540 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1541 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1542 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1544 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1545 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1546 vnet_buffer (b)->ip.adj_index[VLIB_TX] = lbi0;
1548 lb0 = load_balance_get (lbi0);
1549 dpo0 = load_balance_get_bucket_i (lb0, 0);
1552 * Must have a route to source otherwise we drop the packet.
1553 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1556 * - the source is a recieve => it's from us => bogus, do this
1557 * first since it sets a different error code.
1558 * - uRPF check for any route to source - accept if passes.
1559 * - allow packets destined to the broadcast address from unknown sources
1562 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1563 && dpo0->dpoi_type == DPO_RECEIVE) ?
1564 IP4_ERROR_SPOOFED_LOCAL_PACKETS : *error0);
1565 *error0 = ((*error0 == IP4_ERROR_UNKNOWN_PROTOCOL
1566 && !fib_urpf_check_size (lb0->lb_urpf)
1567 && ip0->dst_address.as_u32 != 0xFFFFFFFF) ?
1568 IP4_ERROR_SRC_LOOKUP_MISS : *error0);
1570 last_check->src.as_u32 = ip0->src_address.as_u32;
1571 last_check->lbi = lbi0;
1572 last_check->error = *error0;
1573 last_check->first = 0;
1577 vnet_buffer (b)->ip.adj_index[VLIB_RX] =
1578 vnet_buffer (b)->ip.adj_index[VLIB_TX];
1579 vnet_buffer (b)->ip.adj_index[VLIB_TX] = last_check->lbi;
1580 *error0 = last_check->error;
1585 ip4_local_check_src_x2 (vlib_buffer_t ** b, ip4_header_t ** ip,
1586 ip4_local_last_check_t * last_check, u8 * error)
1588 ip4_fib_mtrie_leaf_t leaf[2];
1589 ip4_fib_mtrie_t *mtrie[2];
1590 const dpo_id_t *dpo[2];
1591 load_balance_t *lb[2];
1595 not_last_hit = last_check->first;
1596 not_last_hit |= ip[0]->src_address.as_u32 ^ last_check->src.as_u32;
1597 not_last_hit |= ip[1]->src_address.as_u32 ^ last_check->src.as_u32;
1599 vnet_buffer (b[0])->ip.fib_index =
1600 vnet_buffer (b[0])->sw_if_index[VLIB_TX] != ~0 ?
1601 vnet_buffer (b[0])->sw_if_index[VLIB_TX] :
1602 vnet_buffer (b[0])->ip.fib_index;
1604 vnet_buffer (b[1])->ip.fib_index =
1605 vnet_buffer (b[1])->sw_if_index[VLIB_TX] != ~0 ?
1606 vnet_buffer (b[1])->sw_if_index[VLIB_TX] :
1607 vnet_buffer (b[1])->ip.fib_index;
1610 * vnet_buffer()->ip.adj_index[VLIB_RX] will be set to the index of the
1611 * adjacency for the destination address (the local interface address).
1612 * vnet_buffer()->ip.adj_index[VLIB_TX] will be set to the index of the
1613 * adjacency for the source address (the remote sender's address)
1615 if (PREDICT_TRUE (not_last_hit))
1617 mtrie[0] = &ip4_fib_get (vnet_buffer (b[0])->ip.fib_index)->mtrie;
1618 mtrie[1] = &ip4_fib_get (vnet_buffer (b[1])->ip.fib_index)->mtrie;
1620 leaf[0] = ip4_fib_mtrie_lookup_step_one (mtrie[0], &ip[0]->src_address);
1621 leaf[1] = ip4_fib_mtrie_lookup_step_one (mtrie[1], &ip[1]->src_address);
1623 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1624 &ip[0]->src_address, 2);
1625 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1626 &ip[1]->src_address, 2);
1628 leaf[0] = ip4_fib_mtrie_lookup_step (mtrie[0], leaf[0],
1629 &ip[0]->src_address, 3);
1630 leaf[1] = ip4_fib_mtrie_lookup_step (mtrie[1], leaf[1],
1631 &ip[1]->src_address, 3);
1633 lbi[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf[0]);
1634 lbi[1] = ip4_fib_mtrie_leaf_get_adj_index (leaf[1]);
1636 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1637 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1638 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = lbi[0];
1640 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1641 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1642 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = lbi[1];
1644 lb[0] = load_balance_get (lbi[0]);
1645 lb[1] = load_balance_get (lbi[1]);
1647 dpo[0] = load_balance_get_bucket_i (lb[0], 0);
1648 dpo[1] = load_balance_get_bucket_i (lb[1], 0);
1650 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1651 dpo[0]->dpoi_type == DPO_RECEIVE) ?
1652 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[0]);
1653 error[0] = ((error[0] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1654 !fib_urpf_check_size (lb[0]->lb_urpf) &&
1655 ip[0]->dst_address.as_u32 != 0xFFFFFFFF)
1656 ? IP4_ERROR_SRC_LOOKUP_MISS : error[0]);
1658 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1659 dpo[1]->dpoi_type == DPO_RECEIVE) ?
1660 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error[1]);
1661 error[1] = ((error[1] == IP4_ERROR_UNKNOWN_PROTOCOL &&
1662 !fib_urpf_check_size (lb[1]->lb_urpf) &&
1663 ip[1]->dst_address.as_u32 != 0xFFFFFFFF)
1664 ? IP4_ERROR_SRC_LOOKUP_MISS : error[1]);
1666 last_check->src.as_u32 = ip[1]->src_address.as_u32;
1667 last_check->lbi = lbi[1];
1668 last_check->error = error[1];
1669 last_check->first = 0;
1673 vnet_buffer (b[0])->ip.adj_index[VLIB_RX] =
1674 vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
1675 vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = last_check->lbi;
1677 vnet_buffer (b[1])->ip.adj_index[VLIB_RX] =
1678 vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
1679 vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = last_check->lbi;
1681 error[0] = last_check->error;
1682 error[1] = last_check->error;
1686 enum ip_local_packet_type_e
1688 IP_LOCAL_PACKET_TYPE_L4,
1689 IP_LOCAL_PACKET_TYPE_NAT,
1690 IP_LOCAL_PACKET_TYPE_FRAG,
1694 * Determine packet type and next node.
1696 * The expectation is that all packets that are not L4 will skip
1697 * checksums and source checks.
1700 ip4_local_classify (vlib_buffer_t * b, ip4_header_t * ip, u16 * next)
1702 ip_lookup_main_t *lm = &ip4_main.lookup_main;
1704 if (PREDICT_FALSE (ip4_is_fragment (ip)))
1706 *next = IP_LOCAL_NEXT_REASSEMBLY;
1707 return IP_LOCAL_PACKET_TYPE_FRAG;
1709 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_IS_NATED))
1711 *next = lm->local_next_by_ip_protocol[ip->protocol];
1712 return IP_LOCAL_PACKET_TYPE_NAT;
1715 *next = lm->local_next_by_ip_protocol[ip->protocol];
1716 return IP_LOCAL_PACKET_TYPE_L4;
1720 ip4_local_inline (vlib_main_t * vm,
1721 vlib_node_runtime_t * node,
1722 vlib_frame_t * frame, int head_of_feature_arc)
1724 u32 *from, n_left_from;
1725 vlib_node_runtime_t *error_node =
1726 vlib_node_get_runtime (vm, ip4_local_node.index);
1727 u16 nexts[VLIB_FRAME_SIZE], *next;
1728 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1729 ip4_header_t *ip[2];
1732 ip4_local_last_check_t last_check = {
1734 * 0.0.0.0 can appear as the source address of an IP packet,
1735 * as can any other address, hence the need to use the 'first'
1736 * member to make sure the .lbi is initialised for the first
1739 .src = {.as_u32 = 0},
1741 .error = IP4_ERROR_UNKNOWN_PROTOCOL,
1745 from = vlib_frame_vector_args (frame);
1746 n_left_from = frame->n_vectors;
1748 if (node->flags & VLIB_NODE_FLAG_TRACE)
1749 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1751 vlib_get_buffers (vm, from, bufs, n_left_from);
1755 while (n_left_from >= 6)
1759 /* Prefetch next iteration. */
1761 vlib_prefetch_buffer_header (b[4], LOAD);
1762 vlib_prefetch_buffer_header (b[5], LOAD);
1764 CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1765 CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD);
1768 error[0] = error[1] = IP4_ERROR_UNKNOWN_PROTOCOL;
1770 ip[0] = vlib_buffer_get_current (b[0]);
1771 ip[1] = vlib_buffer_get_current (b[1]);
1773 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1774 vnet_buffer (b[1])->l3_hdr_offset = b[1]->current_data;
1776 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1777 pt[1] = ip4_local_classify (b[1], ip[1], &next[1]);
1779 not_batch = pt[0] ^ pt[1];
1781 if (head_of_feature_arc == 0 || (pt[0] && not_batch == 0))
1784 if (PREDICT_TRUE (not_batch == 0))
1786 ip4_local_check_l4_csum_x2 (vm, b, ip, error);
1787 ip4_local_check_src_x2 (b, ip, &last_check, error);
1793 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1794 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1798 ip4_local_check_l4_csum (vm, b[1], ip[1], &error[1]);
1799 ip4_local_check_src (b[1], ip[1], &last_check, &error[1]);
1805 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1806 head_of_feature_arc);
1807 ip4_local_set_next_and_error (error_node, b[1], &next[1], error[1],
1808 head_of_feature_arc);
1815 while (n_left_from > 0)
1817 error[0] = IP4_ERROR_UNKNOWN_PROTOCOL;
1819 ip[0] = vlib_buffer_get_current (b[0]);
1820 vnet_buffer (b[0])->l3_hdr_offset = b[0]->current_data;
1821 pt[0] = ip4_local_classify (b[0], ip[0], &next[0]);
1823 if (head_of_feature_arc == 0 || pt[0])
1826 ip4_local_check_l4_csum (vm, b[0], ip[0], &error[0]);
1827 ip4_local_check_src (b[0], ip[0], &last_check, &error[0]);
1831 ip4_local_set_next_and_error (error_node, b[0], &next[0], error[0],
1832 head_of_feature_arc);
1839 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
1840 return frame->n_vectors;
1843 VLIB_NODE_FN (ip4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1844 vlib_frame_t * frame)
1846 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1850 VLIB_REGISTER_NODE (ip4_local_node) =
1852 .name = "ip4-local",
1853 .vector_size = sizeof (u32),
1854 .format_trace = format_ip4_forward_next_trace,
1855 .n_errors = IP4_N_ERROR,
1856 .error_strings = ip4_error_strings,
1857 .n_next_nodes = IP_LOCAL_N_NEXT,
1860 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1861 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1862 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1863 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1864 [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-full-reassembly",
1870 VLIB_NODE_FN (ip4_local_end_of_arc_node) (vlib_main_t * vm,
1871 vlib_node_runtime_t * node,
1872 vlib_frame_t * frame)
1874 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1878 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node) = {
1879 .name = "ip4-local-end-of-arc",
1880 .vector_size = sizeof (u32),
1882 .format_trace = format_ip4_forward_next_trace,
1883 .sibling_of = "ip4-local",
1886 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1887 .arc_name = "ip4-local",
1888 .node_name = "ip4-local-end-of-arc",
1889 .runs_before = 0, /* not before any other features */
1893 #ifndef CLIB_MARCH_VARIANT
1895 ip4_register_protocol (u32 protocol, u32 node_index)
1897 vlib_main_t *vm = vlib_get_main ();
1898 ip4_main_t *im = &ip4_main;
1899 ip_lookup_main_t *lm = &im->lookup_main;
1901 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1902 lm->local_next_by_ip_protocol[protocol] =
1903 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1907 ip4_unregister_protocol (u32 protocol)
1909 ip4_main_t *im = &ip4_main;
1910 ip_lookup_main_t *lm = &im->lookup_main;
1912 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1913 lm->local_next_by_ip_protocol[protocol] = IP_LOCAL_NEXT_PUNT;
1917 static clib_error_t *
1918 show_ip_local_command_fn (vlib_main_t * vm,
1919 unformat_input_t * input, vlib_cli_command_t * cmd)
1921 ip4_main_t *im = &ip4_main;
1922 ip_lookup_main_t *lm = &im->lookup_main;
1925 vlib_cli_output (vm, "Protocols handled by ip4_local");
1926 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1928 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1930 u32 node_index = vlib_get_node (vm,
1931 ip4_local_node.index)->
1932 next_nodes[lm->local_next_by_ip_protocol[i]];
1933 vlib_cli_output (vm, "%U: %U", format_ip_protocol, i,
1934 format_vlib_node_name, vm, node_index);
1943 * Display the set of protocols handled by the local IPv4 stack.
1946 * Example of how to display local protocol table:
1947 * @cliexstart{show ip local}
1948 * Protocols handled by ip4_local
1955 VLIB_CLI_COMMAND (show_ip_local, static) =
1957 .path = "show ip local",
1958 .function = show_ip_local_command_fn,
1959 .short_help = "show ip local",
1965 IP4_REWRITE_NEXT_DROP,
1966 IP4_REWRITE_NEXT_ICMP_ERROR,
1967 IP4_REWRITE_NEXT_FRAGMENT,
1968 IP4_REWRITE_N_NEXT /* Last */
1969 } ip4_rewrite_next_t;
1972 * This bits of an IPv4 address to mask to construct a multicast
1975 #if CLIB_ARCH_IS_BIG_ENDIAN
1976 #define IP4_MCAST_ADDR_MASK 0x007fffff
1978 #define IP4_MCAST_ADDR_MASK 0xffff7f00
1982 ip4_mtu_check (vlib_buffer_t * b, u16 packet_len,
1983 u16 adj_packet_bytes, bool df, u16 * next,
1984 u8 is_midchain, u32 * error)
1986 if (packet_len > adj_packet_bytes)
1988 *error = IP4_ERROR_MTU_EXCEEDED;
1991 icmp4_error_set_vnet_buffer
1992 (b, ICMP4_destination_unreachable,
1993 ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
1995 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
1999 /* IP fragmentation */
2000 ip_frag_set_vnet_buffer (b, adj_packet_bytes,
2002 IP_FRAG_NEXT_IP_REWRITE_MIDCHAIN :
2003 IP_FRAG_NEXT_IP_REWRITE), 0);
2004 *next = IP4_REWRITE_NEXT_FRAGMENT;
2009 /* increment TTL & update checksum.
2010 Works either endian, so no need for byte swap. */
2011 static_always_inline void
2012 ip4_ttl_inc (vlib_buffer_t * b, ip4_header_t * ip)
2016 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2021 checksum = ip->checksum - clib_host_to_net_u16 (0x0100);
2022 checksum += checksum >= 0xffff;
2024 ip->checksum = checksum;
2028 ASSERT (ip4_header_checksum_is_valid (ip));
2031 /* Decrement TTL & update checksum.
2032 Works either endian, so no need for byte swap. */
2033 static_always_inline void
2034 ip4_ttl_and_checksum_check (vlib_buffer_t * b, ip4_header_t * ip, u16 * next,
2039 if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
2044 /* Input node should have reject packets with ttl 0. */
2045 ASSERT (ip->ttl > 0);
2047 checksum = ip->checksum + clib_host_to_net_u16 (0x0100);
2048 checksum += checksum >= 0xffff;
2050 ip->checksum = checksum;
2055 * If the ttl drops below 1 when forwarding, generate
2058 if (PREDICT_FALSE (ttl <= 0))
2060 *error = IP4_ERROR_TIME_EXPIRED;
2061 vnet_buffer (b)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2062 icmp4_error_set_vnet_buffer (b, ICMP4_time_exceeded,
2063 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2065 *next = IP4_REWRITE_NEXT_ICMP_ERROR;
2068 /* Verify checksum. */
2069 ASSERT (ip4_header_checksum_is_valid (ip) ||
2070 (vnet_buffer2 (b)->oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM));
2074 ip4_rewrite_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
2075 vlib_frame_t *frame, int do_counters, int is_midchain,
2078 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2079 u32 *from = vlib_frame_vector_args (frame);
2080 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
2081 u16 nexts[VLIB_FRAME_SIZE], *next;
2083 vlib_node_runtime_t *error_node =
2084 vlib_node_get_runtime (vm, ip4_input_node.index);
2086 n_left_from = frame->n_vectors;
2087 u32 thread_index = vm->thread_index;
2089 vlib_get_buffers (vm, from, bufs, n_left_from);
2090 clib_memset_u16 (nexts, IP4_REWRITE_NEXT_DROP, n_left_from);
2092 #if (CLIB_N_PREFETCHES >= 8)
2093 if (n_left_from >= 6)
2096 for (i = 2; i < 6; i++)
2097 vlib_prefetch_buffer_header (bufs[i], LOAD);
2102 while (n_left_from >= 8)
2104 const ip_adjacency_t *adj0, *adj1;
2105 ip4_header_t *ip0, *ip1;
2106 u32 rw_len0, error0, adj_index0;
2107 u32 rw_len1, error1, adj_index1;
2108 u32 tx_sw_if_index0, tx_sw_if_index1;
2113 vlib_prefetch_buffer_header (b[6], LOAD);
2114 vlib_prefetch_buffer_header (b[7], LOAD);
2117 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2118 adj_index1 = vnet_buffer (b[1])->ip.adj_index[VLIB_TX];
2121 * pre-fetch the per-adjacency counters
2125 vlib_prefetch_combined_counter (&adjacency_counters,
2126 thread_index, adj_index0);
2127 vlib_prefetch_combined_counter (&adjacency_counters,
2128 thread_index, adj_index1);
2131 ip0 = vlib_buffer_get_current (b[0]);
2132 ip1 = vlib_buffer_get_current (b[1]);
2134 error0 = error1 = IP4_ERROR_NONE;
2136 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2137 ip4_ttl_and_checksum_check (b[1], ip1, next + 1, &error1);
2139 /* Rewrite packet header and updates lengths. */
2140 adj0 = adj_get (adj_index0);
2141 adj1 = adj_get (adj_index1);
2143 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2144 rw_len0 = adj0[0].rewrite_header.data_bytes;
2145 rw_len1 = adj1[0].rewrite_header.data_bytes;
2146 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2147 vnet_buffer (b[1])->ip.save_rewrite_length = rw_len1;
2149 p = vlib_buffer_get_current (b[2]);
2150 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2151 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2153 p = vlib_buffer_get_current (b[3]);
2154 CLIB_PREFETCH (p - CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES, STORE);
2155 CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
2157 /* Check MTU of outgoing interface. */
2158 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2159 u16 ip1_len = clib_net_to_host_u16 (ip1->length);
2161 if (b[0]->flags & VNET_BUFFER_F_GSO)
2162 ip0_len = gso_mtu_sz (b[0]);
2163 if (b[1]->flags & VNET_BUFFER_F_GSO)
2164 ip1_len = gso_mtu_sz (b[1]);
2166 ip4_mtu_check (b[0], ip0_len,
2167 adj0[0].rewrite_header.max_l3_packet_bytes,
2168 ip0->flags_and_fragment_offset &
2169 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2170 next + 0, is_midchain, &error0);
2171 ip4_mtu_check (b[1], ip1_len,
2172 adj1[0].rewrite_header.max_l3_packet_bytes,
2173 ip1->flags_and_fragment_offset &
2174 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2175 next + 1, is_midchain, &error1);
2179 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2180 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2181 IP4_ERROR_SAME_INTERFACE : error0);
2182 error1 = ((adj1[0].rewrite_header.sw_if_index ==
2183 vnet_buffer (b[1])->sw_if_index[VLIB_RX]) ?
2184 IP4_ERROR_SAME_INTERFACE : error1);
2187 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2188 * to see the IP header */
2189 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2191 u32 next_index = adj0[0].rewrite_header.next_index;
2192 vlib_buffer_advance (b[0], -(word) rw_len0);
2194 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2195 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2198 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2199 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2202 adj0->ia_cfg_index);
2204 next[0] = next_index;
2206 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2211 b[0]->error = error_node->errors[error0];
2212 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2213 ip4_ttl_inc (b[0], ip0);
2215 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2217 u32 next_index = adj1[0].rewrite_header.next_index;
2218 vlib_buffer_advance (b[1], -(word) rw_len1);
2220 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2221 vnet_buffer (b[1])->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2224 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2225 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2228 adj1->ia_cfg_index);
2229 next[1] = next_index;
2231 vnet_calc_checksums_inline (vm, b[1], 1 /* is_ip4 */ ,
2236 b[1]->error = error_node->errors[error1];
2237 if (error1 == IP4_ERROR_MTU_EXCEEDED)
2238 ip4_ttl_inc (b[1], ip1);
2242 /* Guess we are only writing on ipv4 header. */
2243 vnet_rewrite_two_headers (adj0[0], adj1[0],
2244 ip0, ip1, sizeof (ip4_header_t));
2246 /* Guess we are only writing on simple Ethernet header. */
2247 vnet_rewrite_two_headers (adj0[0], adj1[0],
2248 ip0, ip1, sizeof (ethernet_header_t));
2252 if (error0 == IP4_ERROR_NONE)
2253 vlib_increment_combined_counter
2254 (&adjacency_counters,
2257 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2259 if (error1 == IP4_ERROR_NONE)
2260 vlib_increment_combined_counter
2261 (&adjacency_counters,
2264 vlib_buffer_length_in_chain (vm, b[1]) + rw_len1);
2269 if (error0 == IP4_ERROR_NONE)
2270 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2271 if (error1 == IP4_ERROR_NONE)
2272 adj_midchain_fixup (vm, adj1, b[1], VNET_LINK_IP4);
2277 /* copy bytes from the IP address into the MAC rewrite */
2278 if (error0 == IP4_ERROR_NONE)
2279 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2280 adj0->rewrite_header.dst_mcast_offset,
2281 &ip0->dst_address.as_u32, (u8 *) ip0);
2282 if (error1 == IP4_ERROR_NONE)
2283 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2284 adj1->rewrite_header.dst_mcast_offset,
2285 &ip1->dst_address.as_u32, (u8 *) ip1);
2292 #elif (CLIB_N_PREFETCHES >= 4)
2295 while (n_left_from >= 1)
2297 ip_adjacency_t *adj0;
2299 u32 rw_len0, error0, adj_index0;
2300 u32 tx_sw_if_index0;
2303 /* Prefetch next iteration */
2304 if (PREDICT_TRUE (n_left_from >= 4))
2306 ip_adjacency_t *adj2;
2309 vlib_prefetch_buffer_header (b[3], LOAD);
2310 vlib_prefetch_buffer_data (b[2], LOAD);
2312 /* Prefetch adj->rewrite_header */
2313 adj_index2 = vnet_buffer (b[2])->ip.adj_index[VLIB_TX];
2314 adj2 = adj_get (adj_index2);
2316 CLIB_PREFETCH (p + CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES,
2320 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2323 * Prefetch the per-adjacency counters
2327 vlib_prefetch_combined_counter (&adjacency_counters,
2328 thread_index, adj_index0);
2331 ip0 = vlib_buffer_get_current (b[0]);
2333 error0 = IP4_ERROR_NONE;
2335 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2337 /* Rewrite packet header and updates lengths. */
2338 adj0 = adj_get (adj_index0);
2340 /* Rewrite header was prefetched. */
2341 rw_len0 = adj0[0].rewrite_header.data_bytes;
2342 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2344 /* Check MTU of outgoing interface. */
2345 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2347 if (b[0]->flags & VNET_BUFFER_F_GSO)
2348 ip0_len = gso_mtu_sz (b[0]);
2350 ip4_mtu_check (b[0], ip0_len,
2351 adj0[0].rewrite_header.max_l3_packet_bytes,
2352 ip0->flags_and_fragment_offset &
2353 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2354 next + 0, is_midchain, &error0);
2358 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2359 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2360 IP4_ERROR_SAME_INTERFACE : error0);
2363 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2364 * to see the IP header */
2365 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2367 u32 next_index = adj0[0].rewrite_header.next_index;
2368 vlib_buffer_advance (b[0], -(word) rw_len0);
2369 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2370 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2373 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2374 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2377 adj0->ia_cfg_index);
2378 next[0] = next_index;
2382 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2385 /* Guess we are only writing on ipv4 header. */
2386 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2389 /* Guess we are only writing on simple Ethernet header. */
2390 vnet_rewrite_one_header (adj0[0], ip0,
2391 sizeof (ethernet_header_t));
2394 * Bump the per-adjacency counters
2397 vlib_increment_combined_counter
2398 (&adjacency_counters,
2400 adj_index0, 1, vlib_buffer_length_in_chain (vm,
2404 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2407 /* copy bytes from the IP address into the MAC rewrite */
2408 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2409 adj0->rewrite_header.dst_mcast_offset,
2410 &ip0->dst_address.as_u32, (u8 *) ip0);
2414 b[0]->error = error_node->errors[error0];
2415 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2416 ip4_ttl_inc (b[0], ip0);
2425 while (n_left_from > 0)
2427 ip_adjacency_t *adj0;
2429 u32 rw_len0, adj_index0, error0;
2430 u32 tx_sw_if_index0;
2432 adj_index0 = vnet_buffer (b[0])->ip.adj_index[VLIB_TX];
2434 adj0 = adj_get (adj_index0);
2437 vlib_prefetch_combined_counter (&adjacency_counters,
2438 thread_index, adj_index0);
2440 ip0 = vlib_buffer_get_current (b[0]);
2442 error0 = IP4_ERROR_NONE;
2444 ip4_ttl_and_checksum_check (b[0], ip0, next + 0, &error0);
2447 /* Update packet buffer attributes/set output interface. */
2448 rw_len0 = adj0[0].rewrite_header.data_bytes;
2449 vnet_buffer (b[0])->ip.save_rewrite_length = rw_len0;
2451 /* Check MTU of outgoing interface. */
2452 u16 ip0_len = clib_net_to_host_u16 (ip0->length);
2453 if (b[0]->flags & VNET_BUFFER_F_GSO)
2454 ip0_len = gso_mtu_sz (b[0]);
2456 ip4_mtu_check (b[0], ip0_len,
2457 adj0[0].rewrite_header.max_l3_packet_bytes,
2458 ip0->flags_and_fragment_offset &
2459 clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT),
2460 next + 0, is_midchain, &error0);
2464 error0 = ((adj0[0].rewrite_header.sw_if_index ==
2465 vnet_buffer (b[0])->sw_if_index[VLIB_RX]) ?
2466 IP4_ERROR_SAME_INTERFACE : error0);
2469 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2470 * to see the IP header */
2471 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2473 u32 next_index = adj0[0].rewrite_header.next_index;
2474 vlib_buffer_advance (b[0], -(word) rw_len0);
2475 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2476 vnet_buffer (b[0])->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2479 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2480 vnet_feature_arc_start_w_cfg_index (lm->output_feature_arc_index,
2483 adj0->ia_cfg_index);
2484 next[0] = next_index;
2488 /* this acts on the packet that is about to be encapped */
2489 vnet_calc_checksums_inline (vm, b[0], 1 /* is_ip4 */ ,
2492 /* Guess we are only writing on ipv4 header. */
2493 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ip4_header_t));
2496 /* Guess we are only writing on simple Ethernet header. */
2497 vnet_rewrite_one_header (adj0[0], ip0,
2498 sizeof (ethernet_header_t));
2501 vlib_increment_combined_counter
2502 (&adjacency_counters,
2503 thread_index, adj_index0, 1,
2504 vlib_buffer_length_in_chain (vm, b[0]) + rw_len0);
2507 adj_midchain_fixup (vm, adj0, b[0], VNET_LINK_IP4);
2510 /* copy bytes from the IP address into the MAC rewrite */
2511 vnet_ip_mcast_fixup_header (IP4_MCAST_ADDR_MASK,
2512 adj0->rewrite_header.dst_mcast_offset,
2513 &ip0->dst_address.as_u32, (u8 *) ip0);
2517 b[0]->error = error_node->errors[error0];
2518 /* undo the TTL decrement - we'll be back to do it again */
2519 if (error0 == IP4_ERROR_MTU_EXCEEDED)
2520 ip4_ttl_inc (b[0], ip0);
2529 /* Need to do trace after rewrites to pick up new packet data. */
2530 if (node->flags & VLIB_NODE_FLAG_TRACE)
2531 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2533 vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
2534 return frame->n_vectors;
2537 /** @brief IPv4 rewrite node.
2540 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2541 header checksum, fetch the ip adjacency, check the outbound mtu,
2542 apply the adjacency rewrite, and send pkts to the adjacency
2543 rewrite header's rewrite_next_index.
2545 @param vm vlib_main_t corresponding to the current thread
2546 @param node vlib_node_runtime_t
2547 @param frame vlib_frame_t whose contents should be dispatched
2549 @par Graph mechanics: buffer metadata, next index usage
2552 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2553 - the rewrite adjacency index
2554 - <code>adj->lookup_next_index</code>
2555 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2556 the packet will be dropped.
2557 - <code>adj->rewrite_header</code>
2558 - Rewrite string length, rewrite string, next_index
2561 - <code>b->current_data, b->current_length</code>
2562 - Updated net of applying the rewrite string
2564 <em>Next Indices:</em>
2565 - <code> adj->rewrite_header.next_index </code>
2569 VLIB_NODE_FN (ip4_rewrite_node) (vlib_main_t * vm, 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, 0, 0);
2575 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2578 VLIB_NODE_FN (ip4_rewrite_bcast_node) (vlib_main_t * vm,
2579 vlib_node_runtime_t * node,
2580 vlib_frame_t * frame)
2582 if (adj_are_counters_enabled ())
2583 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2585 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2588 VLIB_NODE_FN (ip4_midchain_node) (vlib_main_t * vm,
2589 vlib_node_runtime_t * node,
2590 vlib_frame_t * frame)
2592 if (adj_are_counters_enabled ())
2593 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2595 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2598 VLIB_NODE_FN (ip4_rewrite_mcast_node) (vlib_main_t * vm,
2599 vlib_node_runtime_t * node,
2600 vlib_frame_t * frame)
2602 if (adj_are_counters_enabled ())
2603 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2605 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2608 VLIB_NODE_FN (ip4_mcast_midchain_node) (vlib_main_t * vm,
2609 vlib_node_runtime_t * node,
2610 vlib_frame_t * frame)
2612 if (adj_are_counters_enabled ())
2613 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2615 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2619 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2620 .name = "ip4-rewrite",
2621 .vector_size = sizeof (u32),
2623 .format_trace = format_ip4_rewrite_trace,
2625 .n_next_nodes = IP4_REWRITE_N_NEXT,
2627 [IP4_REWRITE_NEXT_DROP] = "ip4-drop",
2628 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2629 [IP4_REWRITE_NEXT_FRAGMENT] = "ip4-frag",
2633 VLIB_REGISTER_NODE (ip4_rewrite_bcast_node) = {
2634 .name = "ip4-rewrite-bcast",
2635 .vector_size = sizeof (u32),
2637 .format_trace = format_ip4_rewrite_trace,
2638 .sibling_of = "ip4-rewrite",
2641 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2642 .name = "ip4-rewrite-mcast",
2643 .vector_size = sizeof (u32),
2645 .format_trace = format_ip4_rewrite_trace,
2646 .sibling_of = "ip4-rewrite",
2649 VLIB_REGISTER_NODE (ip4_mcast_midchain_node) = {
2650 .name = "ip4-mcast-midchain",
2651 .vector_size = sizeof (u32),
2653 .format_trace = format_ip4_rewrite_trace,
2654 .sibling_of = "ip4-rewrite",
2657 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2658 .name = "ip4-midchain",
2659 .vector_size = sizeof (u32),
2660 .format_trace = format_ip4_rewrite_trace,
2661 .sibling_of = "ip4-rewrite",
2666 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2668 ip4_fib_mtrie_t *mtrie0;
2669 ip4_fib_mtrie_leaf_t leaf0;
2672 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2674 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2675 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2676 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2678 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2680 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2683 static clib_error_t *
2684 test_lookup_command_fn (vlib_main_t * vm,
2685 unformat_input_t * input, vlib_cli_command_t * cmd)
2692 ip4_address_t ip4_base_address;
2695 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2697 if (unformat (input, "table %d", &table_id))
2699 /* Make sure the entry exists. */
2700 fib = ip4_fib_get (table_id);
2701 if ((fib) && (fib->index != table_id))
2702 return clib_error_return (0, "<fib-index> %d does not exist",
2705 else if (unformat (input, "count %f", &count))
2708 else if (unformat (input, "%U",
2709 unformat_ip4_address, &ip4_base_address))
2712 return clib_error_return (0, "unknown input `%U'",
2713 format_unformat_error, input);
2718 for (i = 0; i < n; i++)
2720 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2723 ip4_base_address.as_u32 =
2724 clib_host_to_net_u32 (1 +
2725 clib_net_to_host_u32 (ip4_base_address.as_u32));
2729 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2731 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2737 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2738 * given FIB table to determine if there is a conflict with the
2739 * adjacency table. The fib-id can be determined by using the
2740 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2743 * @todo This command uses fib-id, other commands use table-id (not
2744 * just a name, they are different indexes). Would like to change this
2745 * to table-id for consistency.
2748 * Example of how to run the test lookup command:
2749 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2750 * No errors in 2 lookups
2754 VLIB_CLI_COMMAND (lookup_test_command, static) =
2756 .path = "test lookup",
2757 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2758 .function = test_lookup_command_fn,
2762 static clib_error_t *
2763 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2764 unformat_input_t * input,
2765 vlib_cli_command_t * cmd)
2769 u32 flow_hash_config = 0;
2772 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2774 if (unformat (input, "table %d", &table_id))
2776 #define _(a, b, v) \
2777 else if (unformat (input, #a)) \
2779 flow_hash_config |= v; \
2782 foreach_flow_hash_bit
2789 return clib_error_return (0, "unknown input `%U'",
2790 format_unformat_error, input);
2792 rv = ip_flow_hash_set (AF_IP4, table_id, flow_hash_config);
2798 case VNET_API_ERROR_NO_SUCH_FIB:
2799 return clib_error_return (0, "no such FIB table %d", table_id);
2802 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2810 * Configure the set of IPv4 fields used by the flow hash.
2813 * Example of how to set the flow hash on a given table:
2814 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2815 * Example of display the configured flow hash:
2816 * @cliexstart{show ip fib}
2817 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2820 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2821 * [0] [@0]: dpo-drop ip6
2824 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2825 * [0] [@0]: dpo-drop ip6
2828 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2829 * [0] [@0]: dpo-drop ip6
2832 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2833 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2836 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2837 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2838 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2839 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2840 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2843 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2844 * [0] [@0]: dpo-drop ip6
2845 * 255.255.255.255/32
2847 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2848 * [0] [@0]: dpo-drop ip6
2849 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2852 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2853 * [0] [@0]: dpo-drop ip6
2856 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2857 * [0] [@0]: dpo-drop ip6
2860 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2861 * [0] [@4]: ipv4-glean: af_packet0
2864 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2865 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2868 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2869 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2872 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2873 * [0] [@4]: ipv4-glean: af_packet1
2876 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2877 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2880 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2881 * [0] [@0]: dpo-drop ip6
2884 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2885 * [0] [@0]: dpo-drop ip6
2886 * 255.255.255.255/32
2888 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2889 * [0] [@0]: dpo-drop ip6
2893 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2895 .path = "set ip flow-hash",
2897 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2898 .function = set_ip_flow_hash_command_fn,
2902 #ifndef CLIB_MARCH_VARIANT
2904 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2907 vnet_main_t *vnm = vnet_get_main ();
2908 vnet_interface_main_t *im = &vnm->interface_main;
2909 ip4_main_t *ipm = &ip4_main;
2910 ip_lookup_main_t *lm = &ipm->lookup_main;
2911 vnet_classify_main_t *cm = &vnet_classify_main;
2912 ip4_address_t *if_addr;
2914 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2915 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2917 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2918 return VNET_API_ERROR_NO_SUCH_ENTRY;
2920 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2921 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
2923 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
2925 if (NULL != if_addr)
2927 fib_prefix_t pfx = {
2929 .fp_proto = FIB_PROTOCOL_IP4,
2930 .fp_addr.ip4 = *if_addr,
2934 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
2938 if (table_index != (u32) ~ 0)
2940 dpo_id_t dpo = DPO_INVALID;
2945 classify_dpo_create (DPO_PROTO_IP4, table_index));
2947 fib_table_entry_special_dpo_add (fib_index,
2949 FIB_SOURCE_CLASSIFY,
2950 FIB_ENTRY_FLAG_NONE, &dpo);
2955 fib_table_entry_special_remove (fib_index,
2956 &pfx, FIB_SOURCE_CLASSIFY);
2964 static clib_error_t *
2965 set_ip_classify_command_fn (vlib_main_t * vm,
2966 unformat_input_t * input,
2967 vlib_cli_command_t * cmd)
2969 u32 table_index = ~0;
2970 int table_index_set = 0;
2971 u32 sw_if_index = ~0;
2974 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2976 if (unformat (input, "table-index %d", &table_index))
2977 table_index_set = 1;
2978 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2979 vnet_get_main (), &sw_if_index))
2985 if (table_index_set == 0)
2986 return clib_error_return (0, "classify table-index must be specified");
2988 if (sw_if_index == ~0)
2989 return clib_error_return (0, "interface / subif must be specified");
2991 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
2998 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2999 return clib_error_return (0, "No such interface");
3001 case VNET_API_ERROR_NO_SUCH_ENTRY:
3002 return clib_error_return (0, "No such classifier table");
3008 * Assign a classification table to an interface. The classification
3009 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3010 * commands. Once the table is create, use this command to filter packets
3014 * Example of how to assign a classification table to an interface:
3015 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3018 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3020 .path = "set ip classify",
3022 "set ip classify intfc <interface> table-index <classify-idx>",
3023 .function = set_ip_classify_command_fn,
3028 * fd.io coding-style-patch-verification: ON
3031 * eval: (c-set-style "gnu")