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/ethernet/ethernet.h> /* for ethernet_header_t */
43 #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
44 #include <vnet/ppp/ppp.h>
45 #include <vnet/srp/srp.h> /* for srp_hw_interface_class */
46 #include <vnet/api_errno.h> /* for API error numbers */
47 #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
48 #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
49 #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */
50 #include <vnet/fib/ip4_fib.h>
51 #include <vnet/dpo/load_balance.h>
52 #include <vnet/dpo/load_balance_map.h>
53 #include <vnet/dpo/classify_dpo.h>
54 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
58 * @brief IPv4 Forwarding.
60 * This file contains the source code for IPv4 forwarding.
64 ip4_forward_next_trace (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
67 vlib_rx_or_tx_t which_adj_index);
70 ip4_lookup_inline (vlib_main_t * vm,
71 vlib_node_runtime_t * node,
73 int lookup_for_responses_to_locally_received_packets)
75 ip4_main_t *im = &ip4_main;
76 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
77 u32 n_left_from, n_left_to_next, *from, *to_next;
78 ip_lookup_next_t next;
79 u32 thread_index = vlib_get_thread_index ();
81 from = vlib_frame_vector_args (frame);
82 n_left_from = frame->n_vectors;
83 next = node->cached_next_index;
85 while (n_left_from > 0)
87 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
89 while (n_left_from >= 8 && n_left_to_next >= 4)
91 vlib_buffer_t *p0, *p1, *p2, *p3;
92 ip4_header_t *ip0, *ip1, *ip2, *ip3;
93 ip_lookup_next_t next0, next1, next2, next3;
94 const load_balance_t *lb0, *lb1, *lb2, *lb3;
95 ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
96 ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
97 ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
98 u32 pi0, fib_index0, lb_index0;
99 u32 pi1, fib_index1, lb_index1;
100 u32 pi2, fib_index2, lb_index2;
101 u32 pi3, fib_index3, lb_index3;
102 flow_hash_config_t flow_hash_config0, flow_hash_config1;
103 flow_hash_config_t flow_hash_config2, flow_hash_config3;
104 u32 hash_c0, hash_c1, hash_c2, hash_c3;
105 const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
107 /* Prefetch next iteration. */
109 vlib_buffer_t *p4, *p5, *p6, *p7;
111 p4 = vlib_get_buffer (vm, from[4]);
112 p5 = vlib_get_buffer (vm, from[5]);
113 p6 = vlib_get_buffer (vm, from[6]);
114 p7 = vlib_get_buffer (vm, from[7]);
116 vlib_prefetch_buffer_header (p4, LOAD);
117 vlib_prefetch_buffer_header (p5, LOAD);
118 vlib_prefetch_buffer_header (p6, LOAD);
119 vlib_prefetch_buffer_header (p7, LOAD);
121 CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
122 CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
123 CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
124 CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
127 pi0 = to_next[0] = from[0];
128 pi1 = to_next[1] = from[1];
129 pi2 = to_next[2] = from[2];
130 pi3 = to_next[3] = from[3];
137 p0 = vlib_get_buffer (vm, pi0);
138 p1 = vlib_get_buffer (vm, pi1);
139 p2 = vlib_get_buffer (vm, pi2);
140 p3 = vlib_get_buffer (vm, pi3);
142 ip0 = vlib_buffer_get_current (p0);
143 ip1 = vlib_buffer_get_current (p1);
144 ip2 = vlib_buffer_get_current (p2);
145 ip3 = vlib_buffer_get_current (p3);
147 dst_addr0 = &ip0->dst_address;
148 dst_addr1 = &ip1->dst_address;
149 dst_addr2 = &ip2->dst_address;
150 dst_addr3 = &ip3->dst_address;
153 vec_elt (im->fib_index_by_sw_if_index,
154 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
156 vec_elt (im->fib_index_by_sw_if_index,
157 vnet_buffer (p1)->sw_if_index[VLIB_RX]);
159 vec_elt (im->fib_index_by_sw_if_index,
160 vnet_buffer (p2)->sw_if_index[VLIB_RX]);
162 vec_elt (im->fib_index_by_sw_if_index,
163 vnet_buffer (p3)->sw_if_index[VLIB_RX]);
165 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
166 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
168 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
169 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
171 (vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
172 (u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
174 (vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
175 (u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
178 if (!lookup_for_responses_to_locally_received_packets)
180 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
181 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
182 mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
183 mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
185 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
186 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
187 leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
188 leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
191 if (!lookup_for_responses_to_locally_received_packets)
193 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
194 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
195 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
196 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
199 if (!lookup_for_responses_to_locally_received_packets)
201 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
202 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
203 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
204 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
207 if (lookup_for_responses_to_locally_received_packets)
209 lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
210 lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
211 lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
212 lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
216 lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
217 lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
218 lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
219 lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
222 ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
223 lb0 = load_balance_get (lb_index0);
224 lb1 = load_balance_get (lb_index1);
225 lb2 = load_balance_get (lb_index2);
226 lb3 = load_balance_get (lb_index3);
228 ASSERT (lb0->lb_n_buckets > 0);
229 ASSERT (is_pow2 (lb0->lb_n_buckets));
230 ASSERT (lb1->lb_n_buckets > 0);
231 ASSERT (is_pow2 (lb1->lb_n_buckets));
232 ASSERT (lb2->lb_n_buckets > 0);
233 ASSERT (is_pow2 (lb2->lb_n_buckets));
234 ASSERT (lb3->lb_n_buckets > 0);
235 ASSERT (is_pow2 (lb3->lb_n_buckets));
237 /* Use flow hash to compute multipath adjacency. */
238 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
239 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
240 hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
241 hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
242 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
244 flow_hash_config0 = lb0->lb_hash_config;
245 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
246 ip4_compute_flow_hash (ip0, flow_hash_config0);
248 load_balance_get_fwd_bucket (lb0,
250 (lb0->lb_n_buckets_minus_1)));
254 dpo0 = load_balance_get_bucket_i (lb0, 0);
256 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
258 flow_hash_config1 = lb1->lb_hash_config;
259 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
260 ip4_compute_flow_hash (ip1, flow_hash_config1);
262 load_balance_get_fwd_bucket (lb1,
264 (lb1->lb_n_buckets_minus_1)));
268 dpo1 = load_balance_get_bucket_i (lb1, 0);
270 if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
272 flow_hash_config2 = lb2->lb_hash_config;
273 hash_c2 = vnet_buffer (p2)->ip.flow_hash =
274 ip4_compute_flow_hash (ip2, flow_hash_config2);
276 load_balance_get_fwd_bucket (lb2,
278 (lb2->lb_n_buckets_minus_1)));
282 dpo2 = load_balance_get_bucket_i (lb2, 0);
284 if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
286 flow_hash_config3 = lb3->lb_hash_config;
287 hash_c3 = vnet_buffer (p3)->ip.flow_hash =
288 ip4_compute_flow_hash (ip3, flow_hash_config3);
290 load_balance_get_fwd_bucket (lb3,
292 (lb3->lb_n_buckets_minus_1)));
296 dpo3 = load_balance_get_bucket_i (lb3, 0);
299 next0 = dpo0->dpoi_next_node;
300 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
301 next1 = dpo1->dpoi_next_node;
302 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
303 next2 = dpo2->dpoi_next_node;
304 vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
305 next3 = dpo3->dpoi_next_node;
306 vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
308 vlib_increment_combined_counter
309 (cm, thread_index, lb_index0, 1,
310 vlib_buffer_length_in_chain (vm, p0));
311 vlib_increment_combined_counter
312 (cm, thread_index, lb_index1, 1,
313 vlib_buffer_length_in_chain (vm, p1));
314 vlib_increment_combined_counter
315 (cm, thread_index, lb_index2, 1,
316 vlib_buffer_length_in_chain (vm, p2));
317 vlib_increment_combined_counter
318 (cm, thread_index, lb_index3, 1,
319 vlib_buffer_length_in_chain (vm, p3));
321 vlib_validate_buffer_enqueue_x4 (vm, node, next,
322 to_next, n_left_to_next,
324 next0, next1, next2, next3);
327 while (n_left_from > 0 && n_left_to_next > 0)
331 ip_lookup_next_t next0;
332 const load_balance_t *lb0;
333 ip4_fib_mtrie_t *mtrie0;
334 ip4_fib_mtrie_leaf_t leaf0;
335 ip4_address_t *dst_addr0;
336 u32 pi0, fib_index0, lbi0;
337 flow_hash_config_t flow_hash_config0;
338 const dpo_id_t *dpo0;
344 p0 = vlib_get_buffer (vm, pi0);
346 ip0 = vlib_buffer_get_current (p0);
348 dst_addr0 = &ip0->dst_address;
351 vec_elt (im->fib_index_by_sw_if_index,
352 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
354 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
355 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
357 if (!lookup_for_responses_to_locally_received_packets)
359 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
361 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
364 if (!lookup_for_responses_to_locally_received_packets)
365 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
367 if (!lookup_for_responses_to_locally_received_packets)
368 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
370 if (lookup_for_responses_to_locally_received_packets)
371 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
374 /* Handle default route. */
375 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
379 lb0 = load_balance_get (lbi0);
381 ASSERT (lb0->lb_n_buckets > 0);
382 ASSERT (is_pow2 (lb0->lb_n_buckets));
384 /* Use flow hash to compute multipath adjacency. */
385 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
386 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
388 flow_hash_config0 = lb0->lb_hash_config;
390 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
391 ip4_compute_flow_hash (ip0, flow_hash_config0);
393 load_balance_get_fwd_bucket (lb0,
395 (lb0->lb_n_buckets_minus_1)));
399 dpo0 = load_balance_get_bucket_i (lb0, 0);
402 next0 = dpo0->dpoi_next_node;
403 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
405 vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
406 vlib_buffer_length_in_chain (vm,
414 if (PREDICT_FALSE (next0 != next))
417 vlib_put_next_frame (vm, node, next, n_left_to_next);
419 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
426 vlib_put_next_frame (vm, node, next, n_left_to_next);
429 if (node->flags & VLIB_NODE_FLAG_TRACE)
430 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
432 return frame->n_vectors;
435 /** @brief IPv4 lookup node.
438 This is the main IPv4 lookup dispatch node.
440 @param vm vlib_main_t corresponding to the current thread
441 @param node vlib_node_runtime_t
442 @param frame vlib_frame_t whose contents should be dispatched
444 @par Graph mechanics: buffer metadata, next index usage
447 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
448 - Indicates the @c sw_if_index value of the interface that the
449 packet was received on.
450 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
451 - When the value is @c ~0 then the node performs a longest prefix
452 match (LPM) for the packet destination address in the FIB attached
453 to the receive interface.
454 - Otherwise perform LPM for the packet destination address in the
455 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
456 value (0, 1, ...) and not a VRF id.
459 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
460 - The lookup result adjacency index.
463 - Dispatches the packet to the node index found in
464 ip_adjacency_t @c adj->lookup_next_index
465 (where @c adj is the lookup result adjacency).
468 ip4_lookup (vlib_main_t * vm,
469 vlib_node_runtime_t * node, vlib_frame_t * frame)
471 return ip4_lookup_inline (vm, node, frame,
472 /* lookup_for_responses_to_locally_received_packets */
477 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
479 VLIB_REGISTER_NODE (ip4_lookup_node) =
481 .function = ip4_lookup,.name = "ip4-lookup",.vector_size =
482 sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
483 IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
485 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
488 ip4_load_balance (vlib_main_t * vm,
489 vlib_node_runtime_t * node, vlib_frame_t * frame)
491 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
492 u32 n_left_from, n_left_to_next, *from, *to_next;
493 ip_lookup_next_t next;
494 u32 thread_index = vlib_get_thread_index ();
496 from = vlib_frame_vector_args (frame);
497 n_left_from = frame->n_vectors;
498 next = node->cached_next_index;
500 if (node->flags & VLIB_NODE_FLAG_TRACE)
501 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
503 while (n_left_from > 0)
505 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
508 while (n_left_from >= 4 && n_left_to_next >= 2)
510 ip_lookup_next_t next0, next1;
511 const load_balance_t *lb0, *lb1;
512 vlib_buffer_t *p0, *p1;
513 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
514 const ip4_header_t *ip0, *ip1;
515 const dpo_id_t *dpo0, *dpo1;
517 /* Prefetch next iteration. */
519 vlib_buffer_t *p2, *p3;
521 p2 = vlib_get_buffer (vm, from[2]);
522 p3 = vlib_get_buffer (vm, from[3]);
524 vlib_prefetch_buffer_header (p2, STORE);
525 vlib_prefetch_buffer_header (p3, STORE);
527 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
528 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
531 pi0 = to_next[0] = from[0];
532 pi1 = to_next[1] = from[1];
539 p0 = vlib_get_buffer (vm, pi0);
540 p1 = vlib_get_buffer (vm, pi1);
542 ip0 = vlib_buffer_get_current (p0);
543 ip1 = vlib_buffer_get_current (p1);
544 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
545 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
547 lb0 = load_balance_get (lbi0);
548 lb1 = load_balance_get (lbi1);
551 * this node is for via FIBs we can re-use the hash value from the
552 * to node if present.
553 * We don't want to use the same hash value at each level in the recursion
554 * graph as that would lead to polarisation
558 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
560 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
562 hc0 = vnet_buffer (p0)->ip.flow_hash =
563 vnet_buffer (p0)->ip.flow_hash >> 1;
567 hc0 = vnet_buffer (p0)->ip.flow_hash =
568 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
570 dpo0 = load_balance_get_fwd_bucket
571 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
575 dpo0 = load_balance_get_bucket_i (lb0, 0);
577 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
579 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
581 hc1 = vnet_buffer (p1)->ip.flow_hash =
582 vnet_buffer (p1)->ip.flow_hash >> 1;
586 hc1 = vnet_buffer (p1)->ip.flow_hash =
587 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
589 dpo1 = load_balance_get_fwd_bucket
590 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
594 dpo1 = load_balance_get_bucket_i (lb1, 0);
597 next0 = dpo0->dpoi_next_node;
598 next1 = dpo1->dpoi_next_node;
600 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
601 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
603 vlib_increment_combined_counter
604 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
605 vlib_increment_combined_counter
606 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
608 vlib_validate_buffer_enqueue_x2 (vm, node, next,
609 to_next, n_left_to_next,
610 pi0, pi1, next0, next1);
613 while (n_left_from > 0 && n_left_to_next > 0)
615 ip_lookup_next_t next0;
616 const load_balance_t *lb0;
619 const ip4_header_t *ip0;
620 const dpo_id_t *dpo0;
629 p0 = vlib_get_buffer (vm, pi0);
631 ip0 = vlib_buffer_get_current (p0);
632 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
634 lb0 = load_balance_get (lbi0);
637 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
639 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
641 hc0 = vnet_buffer (p0)->ip.flow_hash =
642 vnet_buffer (p0)->ip.flow_hash >> 1;
646 hc0 = vnet_buffer (p0)->ip.flow_hash =
647 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
649 dpo0 = load_balance_get_fwd_bucket
650 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
654 dpo0 = load_balance_get_bucket_i (lb0, 0);
657 next0 = dpo0->dpoi_next_node;
658 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
660 vlib_increment_combined_counter
661 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
663 vlib_validate_buffer_enqueue_x1 (vm, node, next,
664 to_next, n_left_to_next,
668 vlib_put_next_frame (vm, node, next, n_left_to_next);
671 return frame->n_vectors;
674 VLIB_REGISTER_NODE (ip4_load_balance_node) =
676 .function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
677 sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
678 format_ip4_lookup_trace,};
680 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
682 /* get first interface address */
684 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
685 ip_interface_address_t ** result_ia)
687 ip_lookup_main_t *lm = &im->lookup_main;
688 ip_interface_address_t *ia = 0;
689 ip4_address_t *result = 0;
692 foreach_ip_interface_address
693 (lm, ia, sw_if_index,
694 1 /* honor unnumbered */ ,
697 ip_interface_address_get_address (lm, ia);
703 *result_ia = result ? ia : 0;
708 ip4_add_interface_routes (u32 sw_if_index,
709 ip4_main_t * im, u32 fib_index,
710 ip_interface_address_t * a)
712 ip_lookup_main_t *lm = &im->lookup_main;
713 ip4_address_t *address = ip_interface_address_get_address (lm, a);
715 .fp_len = a->address_length,
716 .fp_proto = FIB_PROTOCOL_IP4,
717 .fp_addr.ip4 = *address,
720 if (pfx.fp_len <= 30)
722 /* a /30 or shorter - add a glean for the network address */
723 fib_table_entry_update_one_path (fib_index, &pfx,
724 FIB_SOURCE_INTERFACE,
725 (FIB_ENTRY_FLAG_CONNECTED |
726 FIB_ENTRY_FLAG_ATTACHED),
728 /* No next-hop address */
734 // no out-label stack
736 FIB_ROUTE_PATH_FLAG_NONE);
738 /* Add the two broadcast addresses as drop */
739 fib_prefix_t net_pfx = {
741 .fp_proto = FIB_PROTOCOL_IP4,
742 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
744 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
745 fib_table_entry_special_add(fib_index,
747 FIB_SOURCE_INTERFACE,
748 (FIB_ENTRY_FLAG_DROP |
749 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
750 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
751 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
752 fib_table_entry_special_add(fib_index,
754 FIB_SOURCE_INTERFACE,
755 (FIB_ENTRY_FLAG_DROP |
756 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
758 else if (pfx.fp_len == 31)
760 u32 mask = clib_host_to_net_u32(1);
761 fib_prefix_t net_pfx = pfx;
764 net_pfx.fp_addr.ip4.as_u32 ^= mask;
766 /* a /31 - add the other end as an attached host */
767 fib_table_entry_update_one_path (fib_index, &net_pfx,
768 FIB_SOURCE_INTERFACE,
769 (FIB_ENTRY_FLAG_ATTACHED),
777 FIB_ROUTE_PATH_FLAG_NONE);
781 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
783 u32 classify_table_index =
784 lm->classify_table_index_by_sw_if_index[sw_if_index];
785 if (classify_table_index != (u32) ~ 0)
787 dpo_id_t dpo = DPO_INVALID;
792 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
794 fib_table_entry_special_dpo_add (fib_index,
797 FIB_ENTRY_FLAG_NONE, &dpo);
802 fib_table_entry_update_one_path (fib_index, &pfx,
803 FIB_SOURCE_INTERFACE,
804 (FIB_ENTRY_FLAG_CONNECTED |
805 FIB_ENTRY_FLAG_LOCAL),
812 FIB_ROUTE_PATH_FLAG_NONE);
816 ip4_del_interface_routes (ip4_main_t * im,
818 ip4_address_t * address, u32 address_length)
821 .fp_len = address_length,
822 .fp_proto = FIB_PROTOCOL_IP4,
823 .fp_addr.ip4 = *address,
826 if (pfx.fp_len <= 30)
828 fib_prefix_t net_pfx = {
830 .fp_proto = FIB_PROTOCOL_IP4,
831 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
833 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
834 fib_table_entry_special_remove(fib_index,
836 FIB_SOURCE_INTERFACE);
837 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
838 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
839 fib_table_entry_special_remove(fib_index,
841 FIB_SOURCE_INTERFACE);
842 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
844 else if (pfx.fp_len == 31)
846 u32 mask = clib_host_to_net_u32(1);
847 fib_prefix_t net_pfx = pfx;
850 net_pfx.fp_addr.ip4.as_u32 ^= mask;
852 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
856 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
860 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
862 ip4_main_t *im = &ip4_main;
864 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
867 * enable/disable only on the 1<->0 transition
871 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
876 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
877 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
880 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
884 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop",
885 sw_if_index, !is_enable, 0, 0);
888 static clib_error_t *
889 ip4_add_del_interface_address_internal (vlib_main_t * vm,
891 ip4_address_t * address,
892 u32 address_length, u32 is_del)
894 vnet_main_t *vnm = vnet_get_main ();
895 ip4_main_t *im = &ip4_main;
896 ip_lookup_main_t *lm = &im->lookup_main;
897 clib_error_t *error = 0;
898 u32 if_address_index, elts_before;
899 ip4_address_fib_t ip4_af, *addr_fib = 0;
901 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
902 ip4_addr_fib_init (&ip4_af, address,
903 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
904 vec_add1 (addr_fib, ip4_af);
907 * there is no support for adj-fib handling in the presence of overlapping
908 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
914 /* When adding an address check that it does not conflict
915 with an existing address. */
916 ip_interface_address_t *ia;
917 foreach_ip_interface_address
918 (&im->lookup_main, ia, sw_if_index,
919 0 /* honor unnumbered */ ,
922 ip_interface_address_get_address
923 (&im->lookup_main, ia);
924 if (ip4_destination_matches_route
925 (im, address, x, ia->address_length) ||
926 ip4_destination_matches_route (im,
932 ("failed to add %U which conflicts with %U for interface %U",
933 format_ip4_address_and_length, address,
935 format_ip4_address_and_length, x,
937 format_vnet_sw_if_index_name, vnm,
943 elts_before = pool_elts (lm->if_address_pool);
945 error = ip_interface_address_add_del
946 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
950 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
953 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
955 ip4_add_interface_routes (sw_if_index,
956 im, ip4_af.fib_index,
958 (lm->if_address_pool, if_address_index));
960 /* If pool did not grow/shrink: add duplicate address. */
961 if (elts_before != pool_elts (lm->if_address_pool))
963 ip4_add_del_interface_address_callback_t *cb;
964 vec_foreach (cb, im->add_del_interface_address_callbacks)
965 cb->function (im, cb->function_opaque, sw_if_index,
966 address, address_length, if_address_index, is_del);
975 ip4_add_del_interface_address (vlib_main_t * vm,
977 ip4_address_t * address,
978 u32 address_length, u32 is_del)
980 return ip4_add_del_interface_address_internal
981 (vm, sw_if_index, address, address_length, is_del);
984 /* Built-in ip4 unicast rx feature path definition */
986 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
988 .arc_name = "ip4-unicast",
989 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
990 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
993 VNET_FEATURE_INIT (ip4_flow_classify, static) =
995 .arc_name = "ip4-unicast",
996 .node_name = "ip4-flow-classify",
997 .runs_before = VNET_FEATURES ("ip4-inacl"),
1000 VNET_FEATURE_INIT (ip4_inacl, static) =
1002 .arc_name = "ip4-unicast",
1003 .node_name = "ip4-inacl",
1004 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
1007 VNET_FEATURE_INIT (ip4_source_check_1, static) =
1009 .arc_name = "ip4-unicast",
1010 .node_name = "ip4-source-check-via-rx",
1011 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
1014 VNET_FEATURE_INIT (ip4_source_check_2, static) =
1016 .arc_name = "ip4-unicast",
1017 .node_name = "ip4-source-check-via-any",
1018 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1021 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
1023 .arc_name = "ip4-unicast",
1024 .node_name = "ip4-source-and-port-range-check-rx",
1025 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1028 VNET_FEATURE_INIT (ip4_policer_classify, static) =
1030 .arc_name = "ip4-unicast",
1031 .node_name = "ip4-policer-classify",
1032 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1035 VNET_FEATURE_INIT (ip4_ipsec, static) =
1037 .arc_name = "ip4-unicast",
1038 .node_name = "ipsec-input-ip4",
1039 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1042 VNET_FEATURE_INIT (ip4_vpath, static) =
1044 .arc_name = "ip4-unicast",
1045 .node_name = "vpath-input-ip4",
1046 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1049 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1051 .arc_name = "ip4-unicast",
1052 .node_name = "ip4-vxlan-bypass",
1053 .runs_before = VNET_FEATURES ("ip4-lookup"),
1056 VNET_FEATURE_INIT (ip4_drop, static) =
1058 .arc_name = "ip4-unicast",
1059 .node_name = "ip4-drop",
1060 .runs_before = VNET_FEATURES ("ip4-lookup"),
1063 VNET_FEATURE_INIT (ip4_lookup, static) =
1065 .arc_name = "ip4-unicast",
1066 .node_name = "ip4-lookup",
1067 .runs_before = 0, /* not before any other features */
1070 /* Built-in ip4 multicast rx feature path definition */
1071 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1073 .arc_name = "ip4-multicast",
1074 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1075 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1078 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1080 .arc_name = "ip4-multicast",
1081 .node_name = "vpath-input-ip4",
1082 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1085 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1087 .arc_name = "ip4-multicast",
1088 .node_name = "ip4-drop",
1089 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1092 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1094 .arc_name = "ip4-multicast",
1095 .node_name = "ip4-mfib-forward-lookup",
1096 .runs_before = 0, /* last feature */
1099 /* Source and port-range check ip4 tx feature path definition */
1100 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1102 .arc_name = "ip4-output",
1103 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1104 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1107 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1109 .arc_name = "ip4-output",
1110 .node_name = "ip4-source-and-port-range-check-tx",
1111 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1114 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1116 .arc_name = "ip4-output",
1117 .node_name = "ipsec-output-ip4",
1118 .runs_before = VNET_FEATURES ("interface-output"),
1121 /* Built-in ip4 tx feature path definition */
1122 VNET_FEATURE_INIT (ip4_interface_output, static) =
1124 .arc_name = "ip4-output",
1125 .node_name = "interface-output",
1126 .runs_before = 0, /* not before any other features */
1130 static clib_error_t *
1131 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1133 ip4_main_t *im = &ip4_main;
1135 /* Fill in lookup tables with default table (0). */
1136 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1137 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1139 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1142 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1145 return /* no error */ 0;
1148 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1150 /* Global IP4 main. */
1151 ip4_main_t ip4_main;
1154 ip4_lookup_init (vlib_main_t * vm)
1156 ip4_main_t *im = &ip4_main;
1157 clib_error_t *error;
1160 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1163 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1168 m = pow2_mask (i) << (32 - i);
1171 im->fib_masks[i] = clib_host_to_net_u32 (m);
1174 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1176 /* Create FIB with index 0 and table id of 0. */
1177 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1178 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1182 pn = pg_get_node (ip4_lookup_node.index);
1183 pn->unformat_edit = unformat_pg_ip4_header;
1187 ethernet_arp_header_t h;
1189 memset (&h, 0, sizeof (h));
1191 /* Set target ethernet address to all zeros. */
1192 memset (h.ip4_over_ethernet[1].ethernet, 0,
1193 sizeof (h.ip4_over_ethernet[1].ethernet));
1195 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1196 #define _8(f,v) h.f = v;
1197 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1198 _16 (l3_type, ETHERNET_TYPE_IP4);
1199 _8 (n_l2_address_bytes, 6);
1200 _8 (n_l3_address_bytes, 4);
1201 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1205 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1208 /* alloc chunk size */ 8,
1215 VLIB_INIT_FUNCTION (ip4_lookup_init);
1219 /* Adjacency taken. */
1224 /* Packet data, possibly *after* rewrite. */
1225 u8 packet_data[64 - 1 * sizeof (u32)];
1227 ip4_forward_next_trace_t;
1230 format_ip4_forward_next_trace (u8 * s, va_list * args)
1232 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1233 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1234 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1235 uword indent = format_get_indent (s);
1236 s = format (s, "%U%U",
1237 format_white_space, indent,
1238 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1243 format_ip4_lookup_trace (u8 * s, va_list * args)
1245 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1246 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1247 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1248 uword indent = format_get_indent (s);
1250 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1251 t->fib_index, t->dpo_index, t->flow_hash);
1252 s = format (s, "\n%U%U",
1253 format_white_space, indent,
1254 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1259 format_ip4_rewrite_trace (u8 * s, va_list * args)
1261 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1262 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1263 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1264 uword indent = format_get_indent (s);
1266 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1267 t->fib_index, t->dpo_index, format_ip_adjacency,
1268 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1269 s = format (s, "\n%U%U",
1270 format_white_space, indent,
1271 format_ip_adjacency_packet_data,
1272 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1276 /* Common trace function for all ip4-forward next nodes. */
1278 ip4_forward_next_trace (vlib_main_t * vm,
1279 vlib_node_runtime_t * node,
1280 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1283 ip4_main_t *im = &ip4_main;
1285 n_left = frame->n_vectors;
1286 from = vlib_frame_vector_args (frame);
1291 vlib_buffer_t *b0, *b1;
1292 ip4_forward_next_trace_t *t0, *t1;
1294 /* Prefetch next iteration. */
1295 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1296 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1301 b0 = vlib_get_buffer (vm, bi0);
1302 b1 = vlib_get_buffer (vm, bi1);
1304 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1306 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1307 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1308 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1310 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1311 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1312 vec_elt (im->fib_index_by_sw_if_index,
1313 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1315 clib_memcpy (t0->packet_data,
1316 vlib_buffer_get_current (b0),
1317 sizeof (t0->packet_data));
1319 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1321 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1322 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1323 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1325 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1326 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1327 vec_elt (im->fib_index_by_sw_if_index,
1328 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1329 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1330 sizeof (t1->packet_data));
1340 ip4_forward_next_trace_t *t0;
1344 b0 = vlib_get_buffer (vm, bi0);
1346 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1348 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1349 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1350 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1352 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1353 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1354 vec_elt (im->fib_index_by_sw_if_index,
1355 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1356 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1357 sizeof (t0->packet_data));
1365 ip4_drop_or_punt (vlib_main_t * vm,
1366 vlib_node_runtime_t * node,
1367 vlib_frame_t * frame, ip4_error_t error_code)
1369 u32 *buffers = vlib_frame_vector_args (frame);
1370 uword n_packets = frame->n_vectors;
1372 vlib_error_drop_buffers (vm, node, buffers,
1376 ip4_input_node.index, error_code);
1378 if (node->flags & VLIB_NODE_FLAG_TRACE)
1379 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1385 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1387 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1391 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1393 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1397 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1399 .function = ip4_drop,
1401 .vector_size = sizeof (u32),
1402 .format_trace = format_ip4_forward_next_trace,
1409 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1411 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1413 .function = ip4_punt,
1415 .vector_size = sizeof (u32),
1416 .format_trace = format_ip4_forward_next_trace,
1423 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1426 /* Compute TCP/UDP/ICMP4 checksum in software. */
1428 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1432 u32 ip_header_length, payload_length_host_byte_order;
1433 u32 n_this_buffer, n_bytes_left;
1435 void *data_this_buffer;
1437 /* Initialize checksum with ip header. */
1438 ip_header_length = ip4_header_bytes (ip0);
1439 payload_length_host_byte_order =
1440 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1442 clib_host_to_net_u32 (payload_length_host_byte_order +
1443 (ip0->protocol << 16));
1445 if (BITS (uword) == 32)
1448 ip_csum_with_carry (sum0,
1449 clib_mem_unaligned (&ip0->src_address, u32));
1451 ip_csum_with_carry (sum0,
1452 clib_mem_unaligned (&ip0->dst_address, u32));
1456 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1458 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1459 data_this_buffer = (void *) ip0 + ip_header_length;
1460 if (n_this_buffer + ip_header_length > p0->current_length)
1462 p0->current_length >
1463 ip_header_length ? p0->current_length - ip_header_length : 0;
1466 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1467 n_bytes_left -= n_this_buffer;
1468 if (n_bytes_left == 0)
1471 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1472 p0 = vlib_get_buffer (vm, p0->next_buffer);
1473 data_this_buffer = vlib_buffer_get_current (p0);
1474 n_this_buffer = p0->current_length;
1477 sum16 = ~ip_csum_fold (sum0);
1483 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1485 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1489 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1490 || ip0->protocol == IP_PROTOCOL_UDP);
1492 udp0 = (void *) (ip0 + 1);
1493 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1495 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1496 | IP_BUFFER_L4_CHECKSUM_CORRECT);
1500 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1502 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1503 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1509 VNET_FEATURE_ARC_INIT (ip4_local) =
1511 .arc_name = "ip4-local",
1512 .start_nodes = VNET_FEATURES ("ip4-local"),
1517 ip4_local_inline (vlib_main_t * vm,
1518 vlib_node_runtime_t * node,
1519 vlib_frame_t * frame, int head_of_feature_arc)
1521 ip4_main_t *im = &ip4_main;
1522 ip_lookup_main_t *lm = &im->lookup_main;
1523 ip_local_next_t next_index;
1524 u32 *from, *to_next, n_left_from, n_left_to_next;
1525 vlib_node_runtime_t *error_node =
1526 vlib_node_get_runtime (vm, ip4_input_node.index);
1527 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1529 from = vlib_frame_vector_args (frame);
1530 n_left_from = frame->n_vectors;
1531 next_index = node->cached_next_index;
1533 if (node->flags & VLIB_NODE_FLAG_TRACE)
1534 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1536 while (n_left_from > 0)
1538 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1540 while (n_left_from >= 4 && n_left_to_next >= 2)
1542 vlib_buffer_t *p0, *p1;
1543 ip4_header_t *ip0, *ip1;
1544 udp_header_t *udp0, *udp1;
1545 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1546 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1547 const dpo_id_t *dpo0, *dpo1;
1548 const load_balance_t *lb0, *lb1;
1549 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, lbi0;
1550 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, lbi1;
1551 i32 len_diff0, len_diff1;
1552 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1553 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1554 u32 sw_if_index0, sw_if_index1;
1556 pi0 = to_next[0] = from[0];
1557 pi1 = to_next[1] = from[1];
1561 n_left_to_next -= 2;
1563 next0 = next1 = IP_LOCAL_NEXT_DROP;
1565 p0 = vlib_get_buffer (vm, pi0);
1566 p1 = vlib_get_buffer (vm, pi1);
1568 ip0 = vlib_buffer_get_current (p0);
1569 ip1 = vlib_buffer_get_current (p1);
1571 vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
1572 vnet_buffer (p1)->ip.start_of_ip_header = p1->current_data;
1574 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1575 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1577 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1578 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1580 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1582 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1583 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1585 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1587 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1588 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1590 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1591 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1593 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1594 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1596 /* Treat IP frag packets as "experimental" protocol for now
1597 until support of IP frag reassembly is implemented */
1598 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1599 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1601 if (head_of_feature_arc == 0)
1603 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1607 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1608 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1609 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1610 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1615 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1616 good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1618 udp0 = ip4_next_header (ip0);
1619 udp1 = ip4_next_header (ip1);
1621 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1622 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1623 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1625 /* Verify UDP length. */
1626 ip_len0 = clib_net_to_host_u16 (ip0->length);
1627 ip_len1 = clib_net_to_host_u16 (ip1->length);
1628 udp_len0 = clib_net_to_host_u16 (udp0->length);
1629 udp_len1 = clib_net_to_host_u16 (udp1->length);
1631 len_diff0 = ip_len0 - udp_len0;
1632 len_diff1 = ip_len1 - udp_len1;
1634 len_diff0 = is_udp0 ? len_diff0 : 0;
1635 len_diff1 = is_udp1 ? len_diff1 : 0;
1637 if (PREDICT_FALSE (!(is_tcp_udp0 & is_tcp_udp1
1638 & good_tcp_udp0 & good_tcp_udp1)))
1643 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1644 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1646 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1647 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1652 && !(flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1653 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1655 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1656 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1660 good_tcp_udp0 &= len_diff0 >= 0;
1661 good_tcp_udp1 &= len_diff1 >= 0;
1664 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1666 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1668 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1670 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1671 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1673 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1674 error0 = (is_tcp_udp0 && !good_tcp_udp0
1675 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1676 error1 = (is_tcp_udp1 && !good_tcp_udp1
1677 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1680 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1682 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1684 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1685 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1686 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1688 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1689 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1690 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1692 lb0 = load_balance_get (lbi0);
1693 lb1 = load_balance_get (lbi1);
1694 dpo0 = load_balance_get_bucket_i (lb0, 0);
1695 dpo1 = load_balance_get_bucket_i (lb1, 0);
1698 * Must have a route to source otherwise we drop the packet.
1699 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1702 * - the source is a recieve => it's from us => bogus, do this
1703 * first since it sets a different error code.
1704 * - uRPF check for any route to source - accept if passes.
1705 * - allow packets destined to the broadcast address from unknown sources
1707 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1708 dpo0->dpoi_type == DPO_RECEIVE) ?
1709 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1710 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1711 !fib_urpf_check_size (lb0->lb_urpf) &&
1712 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1713 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1714 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1715 dpo1->dpoi_type == DPO_RECEIVE) ?
1716 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1717 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1718 !fib_urpf_check_size (lb1->lb_urpf) &&
1719 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1720 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1724 next0 = lm->local_next_by_ip_protocol[proto0];
1725 next1 = lm->local_next_by_ip_protocol[proto1];
1728 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1730 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1732 p0->error = error0 ? error_node->errors[error0] : 0;
1733 p1->error = error1 ? error_node->errors[error1] : 0;
1735 if (head_of_feature_arc)
1737 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1738 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1739 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1740 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1743 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1744 n_left_to_next, pi0, pi1,
1748 while (n_left_from > 0 && n_left_to_next > 0)
1753 ip4_fib_mtrie_t *mtrie0;
1754 ip4_fib_mtrie_leaf_t leaf0;
1755 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
1757 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1758 load_balance_t *lb0;
1759 const dpo_id_t *dpo0;
1762 pi0 = to_next[0] = from[0];
1766 n_left_to_next -= 1;
1768 next0 = IP_LOCAL_NEXT_DROP;
1770 p0 = vlib_get_buffer (vm, pi0);
1772 ip0 = vlib_buffer_get_current (p0);
1774 vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
1776 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1778 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1781 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1782 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1784 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1786 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1788 /* Treat IP frag packets as "experimental" protocol for now
1789 until support of IP frag reassembly is implemented */
1790 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1792 if (head_of_feature_arc == 0)
1794 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1798 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1799 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1803 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1805 udp0 = ip4_next_header (ip0);
1807 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1808 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1810 /* Verify UDP length. */
1811 ip_len0 = clib_net_to_host_u16 (ip0->length);
1812 udp_len0 = clib_net_to_host_u16 (udp0->length);
1814 len_diff0 = ip_len0 - udp_len0;
1816 len_diff0 = is_udp0 ? len_diff0 : 0;
1818 if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
1823 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1824 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1826 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1827 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1831 good_tcp_udp0 &= len_diff0 >= 0;
1834 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1836 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1838 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1840 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1841 error0 = (is_tcp_udp0 && !good_tcp_udp0
1842 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1845 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1847 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1848 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1850 lb0 = load_balance_get (lbi0);
1851 dpo0 = load_balance_get_bucket_i (lb0, 0);
1853 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1854 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1856 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1857 dpo0->dpoi_type == DPO_RECEIVE) ?
1858 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1859 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1860 !fib_urpf_check_size (lb0->lb_urpf) &&
1861 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1862 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1866 next0 = lm->local_next_by_ip_protocol[proto0];
1869 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1871 p0->error = error0 ? error_node->errors[error0] : 0;
1873 if (head_of_feature_arc)
1875 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1876 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1879 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1880 n_left_to_next, pi0, next0);
1884 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1887 return frame->n_vectors;
1891 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1893 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1897 VLIB_REGISTER_NODE (ip4_local_node) =
1899 .function = ip4_local,
1900 .name = "ip4-local",
1901 .vector_size = sizeof (u32),
1902 .format_trace = format_ip4_forward_next_trace,
1903 .n_next_nodes = IP_LOCAL_N_NEXT,
1906 [IP_LOCAL_NEXT_DROP] = "error-drop",
1907 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1908 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1909 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
1913 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1916 ip4_local_end_of_arc (vlib_main_t * vm,
1917 vlib_node_runtime_t * node, vlib_frame_t * frame)
1919 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1923 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1924 .function = ip4_local_end_of_arc,
1925 .name = "ip4-local-end-of-arc",
1926 .vector_size = sizeof (u32),
1928 .format_trace = format_ip4_forward_next_trace,
1929 .sibling_of = "ip4-local",
1932 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1934 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1935 .arc_name = "ip4-local",
1936 .node_name = "ip4-local-end-of-arc",
1937 .runs_before = 0, /* not before any other features */
1942 ip4_register_protocol (u32 protocol, u32 node_index)
1944 vlib_main_t *vm = vlib_get_main ();
1945 ip4_main_t *im = &ip4_main;
1946 ip_lookup_main_t *lm = &im->lookup_main;
1948 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1949 lm->local_next_by_ip_protocol[protocol] =
1950 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1953 static clib_error_t *
1954 show_ip_local_command_fn (vlib_main_t * vm,
1955 unformat_input_t * input, vlib_cli_command_t * cmd)
1957 ip4_main_t *im = &ip4_main;
1958 ip_lookup_main_t *lm = &im->lookup_main;
1961 vlib_cli_output (vm, "Protocols handled by ip4_local");
1962 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1964 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1965 vlib_cli_output (vm, "%d", i);
1973 * Display the set of protocols handled by the local IPv4 stack.
1976 * Example of how to display local protocol table:
1977 * @cliexstart{show ip local}
1978 * Protocols handled by ip4_local
1985 VLIB_CLI_COMMAND (show_ip_local, static) =
1987 .path = "show ip local",
1988 .function = show_ip_local_command_fn,
1989 .short_help = "show ip local",
1994 ip4_arp_inline (vlib_main_t * vm,
1995 vlib_node_runtime_t * node,
1996 vlib_frame_t * frame, int is_glean)
1998 vnet_main_t *vnm = vnet_get_main ();
1999 ip4_main_t *im = &ip4_main;
2000 ip_lookup_main_t *lm = &im->lookup_main;
2001 u32 *from, *to_next_drop;
2002 uword n_left_from, n_left_to_next_drop, next_index;
2003 static f64 time_last_seed_change = -1e100;
2004 static u32 hash_seeds[3];
2005 static uword hash_bitmap[256 / BITS (uword)];
2008 if (node->flags & VLIB_NODE_FLAG_TRACE)
2009 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2011 time_now = vlib_time_now (vm);
2012 if (time_now - time_last_seed_change > 1e-3)
2015 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
2016 sizeof (hash_seeds));
2017 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2018 hash_seeds[i] = r[i];
2020 /* Mark all hash keys as been no-seen before. */
2021 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2024 time_last_seed_change = time_now;
2027 from = vlib_frame_vector_args (frame);
2028 n_left_from = frame->n_vectors;
2029 next_index = node->cached_next_index;
2030 if (next_index == IP4_ARP_NEXT_DROP)
2031 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2033 while (n_left_from > 0)
2035 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2036 to_next_drop, n_left_to_next_drop);
2038 while (n_left_from > 0 && n_left_to_next_drop > 0)
2040 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2041 ip_adjacency_t *adj0;
2048 p0 = vlib_get_buffer (vm, pi0);
2050 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2051 adj0 = adj_get (adj_index0);
2052 ip0 = vlib_buffer_get_current (p0);
2058 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2059 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2064 * this is the Glean case, so we are ARPing for the
2065 * packet's destination
2067 a0 ^= ip0->dst_address.data_u32;
2071 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2075 hash_v3_finalize32 (a0, b0, c0);
2077 c0 &= BITS (hash_bitmap) - 1;
2078 c0 = c0 / BITS (uword);
2079 m0 = (uword) 1 << (c0 % BITS (uword));
2081 bm0 = hash_bitmap[c0];
2082 drop0 = (bm0 & m0) != 0;
2084 /* Mark it as seen. */
2085 hash_bitmap[c0] = bm0 | m0;
2089 to_next_drop[0] = pi0;
2091 n_left_to_next_drop -= 1;
2094 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2095 IP4_ARP_ERROR_REQUEST_SENT];
2098 * the adj has been updated to a rewrite but the node the DPO that got
2099 * us here hasn't - yet. no big deal. we'll drop while we wait.
2101 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2108 * Can happen if the control-plane is programming tables
2109 * with traffic flowing; at least that's today's lame excuse.
2111 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2112 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2114 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2117 /* Send ARP request. */
2121 ethernet_arp_header_t *h0;
2122 vnet_hw_interface_t *hw_if0;
2125 vlib_packet_template_get_packet (vm,
2126 &im->ip4_arp_request_packet_template,
2129 /* Add rewrite/encap string for ARP packet. */
2130 vnet_rewrite_one_header (adj0[0], h0,
2131 sizeof (ethernet_header_t));
2133 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2135 /* Src ethernet address in ARP header. */
2136 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2138 sizeof (h0->ip4_over_ethernet[0].ethernet));
2142 /* The interface's source address is stashed in the Glean Adj */
2143 h0->ip4_over_ethernet[0].ip4 =
2144 adj0->sub_type.glean.receive_addr.ip4;
2146 /* Copy in destination address we are requesting. This is the
2147 * glean case, so it's the packet's destination.*/
2148 h0->ip4_over_ethernet[1].ip4.data_u32 =
2149 ip0->dst_address.data_u32;
2153 /* Src IP address in ARP header. */
2154 if (ip4_src_address_for_packet (lm, sw_if_index0,
2156 ip4_over_ethernet[0].ip4))
2158 /* No source address available */
2160 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2161 vlib_buffer_free (vm, &bi0, 1);
2165 /* Copy in destination address we are requesting from the
2167 h0->ip4_over_ethernet[1].ip4.data_u32 =
2168 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2171 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2172 b0 = vlib_get_buffer (vm, bi0);
2173 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2175 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2177 vlib_set_next_frame_buffer (vm, node,
2178 adj0->rewrite_header.next_index,
2183 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2186 return frame->n_vectors;
2190 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2192 return (ip4_arp_inline (vm, node, frame, 0));
2196 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2198 return (ip4_arp_inline (vm, node, frame, 1));
2201 static char *ip4_arp_error_strings[] = {
2202 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2203 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2204 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2205 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2206 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2207 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2210 VLIB_REGISTER_NODE (ip4_arp_node) =
2212 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2213 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2214 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2215 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2217 [IP4_ARP_NEXT_DROP] = "error-drop",}
2220 VLIB_REGISTER_NODE (ip4_glean_node) =
2222 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2223 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2224 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2225 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2227 [IP4_ARP_NEXT_DROP] = "error-drop",}
2230 #define foreach_notrace_ip4_arp_error \
2237 arp_notrace_init (vlib_main_t * vm)
2239 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2241 /* don't trace ARP request packets */
2243 vnet_pcap_drop_trace_filter_add_del \
2244 (rt->errors[IP4_ARP_ERROR_##a], \
2246 foreach_notrace_ip4_arp_error;
2251 VLIB_INIT_FUNCTION (arp_notrace_init);
2254 /* Send an ARP request to see if given destination is reachable on given interface. */
2256 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2258 vnet_main_t *vnm = vnet_get_main ();
2259 ip4_main_t *im = &ip4_main;
2260 ethernet_arp_header_t *h;
2262 ip_interface_address_t *ia;
2263 ip_adjacency_t *adj;
2264 vnet_hw_interface_t *hi;
2265 vnet_sw_interface_t *si;
2270 si = vnet_get_sw_interface (vnm, sw_if_index);
2272 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2274 return clib_error_return (0, "%U: interface %U down",
2275 format_ip4_address, dst,
2276 format_vnet_sw_if_index_name, vnm,
2281 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2284 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2285 return clib_error_return
2287 "no matching interface address for destination %U (interface %U)",
2288 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2292 ip46_address_t nh = {
2296 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2297 VNET_LINK_IP4, &nh, sw_if_index);
2300 h = vlib_packet_template_get_packet (vm,
2301 &im->ip4_arp_request_packet_template,
2304 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2306 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2307 sizeof (h->ip4_over_ethernet[0].ethernet));
2309 h->ip4_over_ethernet[0].ip4 = src[0];
2310 h->ip4_over_ethernet[1].ip4 = dst[0];
2312 b = vlib_get_buffer (vm, bi);
2313 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2314 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2316 /* Add encapsulation string for software interface (e.g. ethernet header). */
2317 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2318 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2321 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2322 u32 *to_next = vlib_frame_vector_args (f);
2325 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2329 return /* no error */ 0;
2334 IP4_REWRITE_NEXT_DROP,
2335 IP4_REWRITE_NEXT_ICMP_ERROR,
2336 } ip4_rewrite_next_t;
2339 ip4_rewrite_inline (vlib_main_t * vm,
2340 vlib_node_runtime_t * node,
2341 vlib_frame_t * frame,
2342 int do_counters, int is_midchain, int is_mcast)
2344 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2345 u32 *from = vlib_frame_vector_args (frame);
2346 u32 n_left_from, n_left_to_next, *to_next, next_index;
2347 vlib_node_runtime_t *error_node =
2348 vlib_node_get_runtime (vm, ip4_input_node.index);
2350 n_left_from = frame->n_vectors;
2351 next_index = node->cached_next_index;
2352 u32 thread_index = vlib_get_thread_index ();
2354 while (n_left_from > 0)
2356 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2358 while (n_left_from >= 4 && n_left_to_next >= 2)
2360 ip_adjacency_t *adj0, *adj1;
2361 vlib_buffer_t *p0, *p1;
2362 ip4_header_t *ip0, *ip1;
2363 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2364 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2365 u32 tx_sw_if_index0, tx_sw_if_index1;
2367 /* Prefetch next iteration. */
2369 vlib_buffer_t *p2, *p3;
2371 p2 = vlib_get_buffer (vm, from[2]);
2372 p3 = vlib_get_buffer (vm, from[3]);
2374 vlib_prefetch_buffer_header (p2, STORE);
2375 vlib_prefetch_buffer_header (p3, STORE);
2377 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2378 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2381 pi0 = to_next[0] = from[0];
2382 pi1 = to_next[1] = from[1];
2387 n_left_to_next -= 2;
2389 p0 = vlib_get_buffer (vm, pi0);
2390 p1 = vlib_get_buffer (vm, pi1);
2392 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2393 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2396 * pre-fetch the per-adjacency counters
2400 vlib_prefetch_combined_counter (&adjacency_counters,
2401 thread_index, adj_index0);
2402 vlib_prefetch_combined_counter (&adjacency_counters,
2403 thread_index, adj_index1);
2406 ip0 = vlib_buffer_get_current (p0);
2407 ip1 = vlib_buffer_get_current (p1);
2409 error0 = error1 = IP4_ERROR_NONE;
2410 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2412 /* Decrement TTL & update checksum.
2413 Works either endian, so no need for byte swap. */
2414 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2416 i32 ttl0 = ip0->ttl;
2418 /* Input node should have reject packets with ttl 0. */
2419 ASSERT (ip0->ttl > 0);
2421 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2422 checksum0 += checksum0 >= 0xffff;
2424 ip0->checksum = checksum0;
2429 * If the ttl drops below 1 when forwarding, generate
2432 if (PREDICT_FALSE (ttl0 <= 0))
2434 error0 = IP4_ERROR_TIME_EXPIRED;
2435 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2436 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2437 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2439 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2442 /* Verify checksum. */
2443 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2447 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2449 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2451 i32 ttl1 = ip1->ttl;
2453 /* Input node should have reject packets with ttl 0. */
2454 ASSERT (ip1->ttl > 0);
2456 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2457 checksum1 += checksum1 >= 0xffff;
2459 ip1->checksum = checksum1;
2464 * If the ttl drops below 1 when forwarding, generate
2467 if (PREDICT_FALSE (ttl1 <= 0))
2469 error1 = IP4_ERROR_TIME_EXPIRED;
2470 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2471 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2472 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2474 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2477 /* Verify checksum. */
2478 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2482 p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2485 /* Rewrite packet header and updates lengths. */
2486 adj0 = adj_get (adj_index0);
2487 adj1 = adj_get (adj_index1);
2489 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2490 rw_len0 = adj0[0].rewrite_header.data_bytes;
2491 rw_len1 = adj1[0].rewrite_header.data_bytes;
2492 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2493 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2495 /* Check MTU of outgoing interface. */
2497 (vlib_buffer_length_in_chain (vm, p0) >
2499 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2502 (vlib_buffer_length_in_chain (vm, p1) >
2504 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2507 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2508 * to see the IP headerr */
2509 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2511 next0 = adj0[0].rewrite_header.next_index;
2512 p0->current_data -= rw_len0;
2513 p0->current_length += rw_len0;
2514 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2515 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2518 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2519 vnet_feature_arc_start (lm->output_feature_arc_index,
2520 tx_sw_if_index0, &next0, p0);
2522 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2524 next1 = adj1[0].rewrite_header.next_index;
2525 p1->current_data -= rw_len1;
2526 p1->current_length += rw_len1;
2528 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2529 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2532 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2533 vnet_feature_arc_start (lm->output_feature_arc_index,
2534 tx_sw_if_index1, &next1, p1);
2537 /* Guess we are only writing on simple Ethernet header. */
2538 vnet_rewrite_two_headers (adj0[0], adj1[0],
2539 ip0, ip1, sizeof (ethernet_header_t));
2542 * Bump the per-adjacency counters
2546 vlib_increment_combined_counter
2547 (&adjacency_counters,
2550 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2552 vlib_increment_combined_counter
2553 (&adjacency_counters,
2556 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2561 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2562 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2567 * copy bytes from the IP address into the MAC rewrite
2569 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2570 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2573 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2574 to_next, n_left_to_next,
2575 pi0, pi1, next0, next1);
2578 while (n_left_from > 0 && n_left_to_next > 0)
2580 ip_adjacency_t *adj0;
2583 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2584 u32 tx_sw_if_index0;
2586 pi0 = to_next[0] = from[0];
2588 p0 = vlib_get_buffer (vm, pi0);
2590 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2592 adj0 = adj_get (adj_index0);
2594 ip0 = vlib_buffer_get_current (p0);
2596 error0 = IP4_ERROR_NONE;
2597 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2599 /* Decrement TTL & update checksum. */
2600 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2602 i32 ttl0 = ip0->ttl;
2604 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2606 checksum0 += checksum0 >= 0xffff;
2608 ip0->checksum = checksum0;
2610 ASSERT (ip0->ttl > 0);
2616 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2618 if (PREDICT_FALSE (ttl0 <= 0))
2621 * If the ttl drops below 1 when forwarding, generate
2624 error0 = IP4_ERROR_TIME_EXPIRED;
2625 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2626 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2627 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2628 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2634 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2638 vlib_prefetch_combined_counter (&adjacency_counters,
2639 thread_index, adj_index0);
2641 /* Guess we are only writing on simple Ethernet header. */
2642 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2646 * copy bytes from the IP address into the MAC rewrite
2648 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2651 /* Update packet buffer attributes/set output interface. */
2652 rw_len0 = adj0[0].rewrite_header.data_bytes;
2653 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2656 vlib_increment_combined_counter
2657 (&adjacency_counters,
2658 thread_index, adj_index0, 1,
2659 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2661 /* Check MTU of outgoing interface. */
2662 error0 = (vlib_buffer_length_in_chain (vm, p0)
2663 > adj0[0].rewrite_header.max_l3_packet_bytes
2664 ? IP4_ERROR_MTU_EXCEEDED : error0);
2666 p0->error = error_node->errors[error0];
2668 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2669 * to see the IP headerr */
2670 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2672 p0->current_data -= rw_len0;
2673 p0->current_length += rw_len0;
2674 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2676 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2677 next0 = adj0[0].rewrite_header.next_index;
2681 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2685 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2686 vnet_feature_arc_start (lm->output_feature_arc_index,
2687 tx_sw_if_index0, &next0, p0);
2694 n_left_to_next -= 1;
2696 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2697 to_next, n_left_to_next,
2701 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2704 /* Need to do trace after rewrites to pick up new packet data. */
2705 if (node->flags & VLIB_NODE_FLAG_TRACE)
2706 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2708 return frame->n_vectors;
2712 /** @brief IPv4 rewrite node.
2715 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2716 header checksum, fetch the ip adjacency, check the outbound mtu,
2717 apply the adjacency rewrite, and send pkts to the adjacency
2718 rewrite header's rewrite_next_index.
2720 @param vm vlib_main_t corresponding to the current thread
2721 @param node vlib_node_runtime_t
2722 @param frame vlib_frame_t whose contents should be dispatched
2724 @par Graph mechanics: buffer metadata, next index usage
2727 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2728 - the rewrite adjacency index
2729 - <code>adj->lookup_next_index</code>
2730 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2731 the packet will be dropped.
2732 - <code>adj->rewrite_header</code>
2733 - Rewrite string length, rewrite string, next_index
2736 - <code>b->current_data, b->current_length</code>
2737 - Updated net of applying the rewrite string
2739 <em>Next Indices:</em>
2740 - <code> adj->rewrite_header.next_index </code>
2744 ip4_rewrite (vlib_main_t * vm,
2745 vlib_node_runtime_t * node, vlib_frame_t * frame)
2747 if (adj_are_counters_enabled ())
2748 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2750 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2754 ip4_midchain (vlib_main_t * vm,
2755 vlib_node_runtime_t * node, vlib_frame_t * frame)
2757 if (adj_are_counters_enabled ())
2758 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2760 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2764 ip4_rewrite_mcast (vlib_main_t * vm,
2765 vlib_node_runtime_t * node, vlib_frame_t * frame)
2767 if (adj_are_counters_enabled ())
2768 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2770 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2774 ip4_mcast_midchain (vlib_main_t * vm,
2775 vlib_node_runtime_t * node, vlib_frame_t * frame)
2777 if (adj_are_counters_enabled ())
2778 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2780 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2784 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2785 .function = ip4_rewrite,
2786 .name = "ip4-rewrite",
2787 .vector_size = sizeof (u32),
2789 .format_trace = format_ip4_rewrite_trace,
2793 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2794 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2797 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2799 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2800 .function = ip4_rewrite_mcast,
2801 .name = "ip4-rewrite-mcast",
2802 .vector_size = sizeof (u32),
2804 .format_trace = format_ip4_rewrite_trace,
2805 .sibling_of = "ip4-rewrite",
2807 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2809 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2810 .function = ip4_mcast_midchain,
2811 .name = "ip4-mcast-midchain",
2812 .vector_size = sizeof (u32),
2814 .format_trace = format_ip4_rewrite_trace,
2815 .sibling_of = "ip4-rewrite",
2817 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2819 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2820 .function = ip4_midchain,
2821 .name = "ip4-midchain",
2822 .vector_size = sizeof (u32),
2823 .format_trace = format_ip4_forward_next_trace,
2824 .sibling_of = "ip4-rewrite",
2826 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2829 static clib_error_t *
2830 add_del_interface_table (vlib_main_t * vm,
2831 unformat_input_t * input, vlib_cli_command_t * cmd)
2833 vnet_main_t *vnm = vnet_get_main ();
2834 ip_interface_address_t *ia;
2835 clib_error_t *error = 0;
2836 u32 sw_if_index, table_id;
2840 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2842 error = clib_error_return (0, "unknown interface `%U'",
2843 format_unformat_error, input);
2847 if (unformat (input, "%d", &table_id))
2851 error = clib_error_return (0, "expected table id `%U'",
2852 format_unformat_error, input);
2857 * If the interface already has in IP address, then a change int
2858 * VRF is not allowed. The IP address applied must first be removed.
2859 * We do not do that automatically here, since VPP has no knowledge
2860 * of whether thoses subnets are valid in the destination VRF.
2863 foreach_ip_interface_address (&ip4_main.lookup_main,
2865 1 /* honor unnumbered */,
2869 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2870 error = clib_error_return (0, "interface %U has address %U",
2871 format_vnet_sw_if_index_name, vnm,
2873 format_ip4_address, a);
2879 ip4_main_t *im = &ip4_main;
2882 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2884 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2885 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2887 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2888 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2889 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2897 * Place the indicated interface into the supplied IPv4 FIB table (also known
2898 * as a VRF). If the FIB table does not exist, this command creates it. To
2899 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2900 * FIB table will only be displayed if a route has been added to the table, or
2901 * an IP Address is assigned to an interface in the table (which adds a route
2904 * @note IP addresses added after setting the interface IP table are added to
2905 * the indicated FIB table. If an IP address is added prior to changing the
2906 * table then this is an error. The control plane must remove these addresses
2907 * first and then change the table. VPP will not automatically move the
2908 * addresses from the old to the new table as it does not know the validity
2912 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2913 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2916 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2918 .path = "set interface ip table",
2919 .function = add_del_interface_table,
2920 .short_help = "set interface ip table <interface> <table-id>",
2925 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2927 ip4_fib_mtrie_t *mtrie0;
2928 ip4_fib_mtrie_leaf_t leaf0;
2931 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2933 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2934 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2935 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2937 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2939 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2942 static clib_error_t *
2943 test_lookup_command_fn (vlib_main_t * vm,
2944 unformat_input_t * input, vlib_cli_command_t * cmd)
2951 ip4_address_t ip4_base_address;
2954 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2956 if (unformat (input, "table %d", &table_id))
2958 /* Make sure the entry exists. */
2959 fib = ip4_fib_get (table_id);
2960 if ((fib) && (fib->index != table_id))
2961 return clib_error_return (0, "<fib-index> %d does not exist",
2964 else if (unformat (input, "count %f", &count))
2967 else if (unformat (input, "%U",
2968 unformat_ip4_address, &ip4_base_address))
2971 return clib_error_return (0, "unknown input `%U'",
2972 format_unformat_error, input);
2977 for (i = 0; i < n; i++)
2979 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2982 ip4_base_address.as_u32 =
2983 clib_host_to_net_u32 (1 +
2984 clib_net_to_host_u32 (ip4_base_address.as_u32));
2988 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2990 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2996 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2997 * given FIB table to determine if there is a conflict with the
2998 * adjacency table. The fib-id can be determined by using the
2999 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
3002 * @todo This command uses fib-id, other commands use table-id (not
3003 * just a name, they are different indexes). Would like to change this
3004 * to table-id for consistency.
3007 * Example of how to run the test lookup command:
3008 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
3009 * No errors in 2 lookups
3013 VLIB_CLI_COMMAND (lookup_test_command, static) =
3015 .path = "test lookup",
3016 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
3017 .function = test_lookup_command_fn,
3022 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
3026 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
3028 if (~0 == fib_index)
3029 return VNET_API_ERROR_NO_SUCH_FIB;
3031 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
3037 static clib_error_t *
3038 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3039 unformat_input_t * input,
3040 vlib_cli_command_t * cmd)
3044 u32 flow_hash_config = 0;
3047 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3049 if (unformat (input, "table %d", &table_id))
3052 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3053 foreach_flow_hash_bit
3060 return clib_error_return (0, "unknown input `%U'",
3061 format_unformat_error, input);
3063 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3069 case VNET_API_ERROR_NO_SUCH_FIB:
3070 return clib_error_return (0, "no such FIB table %d", table_id);
3073 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3081 * Configure the set of IPv4 fields used by the flow hash.
3084 * Example of how to set the flow hash on a given table:
3085 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3086 * Example of display the configured flow hash:
3087 * @cliexstart{show ip fib}
3088 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3091 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3092 * [0] [@0]: dpo-drop ip6
3095 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3096 * [0] [@0]: dpo-drop ip6
3099 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3100 * [0] [@0]: dpo-drop ip6
3103 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3104 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3107 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3108 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3109 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3110 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3111 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3114 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3115 * [0] [@0]: dpo-drop ip6
3116 * 255.255.255.255/32
3118 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3119 * [0] [@0]: dpo-drop ip6
3120 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3123 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3124 * [0] [@0]: dpo-drop ip6
3127 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3128 * [0] [@0]: dpo-drop ip6
3131 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3132 * [0] [@4]: ipv4-glean: af_packet0
3135 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3136 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3139 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3140 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3143 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3144 * [0] [@4]: ipv4-glean: af_packet1
3147 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3148 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3151 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3152 * [0] [@0]: dpo-drop ip6
3155 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3156 * [0] [@0]: dpo-drop ip6
3157 * 255.255.255.255/32
3159 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3160 * [0] [@0]: dpo-drop ip6
3164 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3166 .path = "set ip flow-hash",
3168 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3169 .function = set_ip_flow_hash_command_fn,
3174 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3177 vnet_main_t *vnm = vnet_get_main ();
3178 vnet_interface_main_t *im = &vnm->interface_main;
3179 ip4_main_t *ipm = &ip4_main;
3180 ip_lookup_main_t *lm = &ipm->lookup_main;
3181 vnet_classify_main_t *cm = &vnet_classify_main;
3182 ip4_address_t *if_addr;
3184 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3185 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3187 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3188 return VNET_API_ERROR_NO_SUCH_ENTRY;
3190 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3191 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3193 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3195 if (NULL != if_addr)
3197 fib_prefix_t pfx = {
3199 .fp_proto = FIB_PROTOCOL_IP4,
3200 .fp_addr.ip4 = *if_addr,
3204 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3208 if (table_index != (u32) ~ 0)
3210 dpo_id_t dpo = DPO_INVALID;
3215 classify_dpo_create (DPO_PROTO_IP4, table_index));
3217 fib_table_entry_special_dpo_add (fib_index,
3219 FIB_SOURCE_CLASSIFY,
3220 FIB_ENTRY_FLAG_NONE, &dpo);
3225 fib_table_entry_special_remove (fib_index,
3226 &pfx, FIB_SOURCE_CLASSIFY);
3233 static clib_error_t *
3234 set_ip_classify_command_fn (vlib_main_t * vm,
3235 unformat_input_t * input,
3236 vlib_cli_command_t * cmd)
3238 u32 table_index = ~0;
3239 int table_index_set = 0;
3240 u32 sw_if_index = ~0;
3243 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3245 if (unformat (input, "table-index %d", &table_index))
3246 table_index_set = 1;
3247 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3248 vnet_get_main (), &sw_if_index))
3254 if (table_index_set == 0)
3255 return clib_error_return (0, "classify table-index must be specified");
3257 if (sw_if_index == ~0)
3258 return clib_error_return (0, "interface / subif must be specified");
3260 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3267 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3268 return clib_error_return (0, "No such interface");
3270 case VNET_API_ERROR_NO_SUCH_ENTRY:
3271 return clib_error_return (0, "No such classifier table");
3277 * Assign a classification table to an interface. The classification
3278 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3279 * commands. Once the table is create, use this command to filter packets
3283 * Example of how to assign a classification table to an interface:
3284 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3287 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3289 .path = "set ip classify",
3291 "set ip classify intfc <interface> table-index <classify-idx>",
3292 .function = set_ip_classify_command_fn,
3297 * fd.io coding-style-patch-verification: ON
3300 * eval: (c-set-style "gnu")