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 /* local0 interface doesn't support IP addressing */
902 if (sw_if_index == 0)
905 clib_error_create ("local0 interface doesn't support IP addressing");
908 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
909 ip4_addr_fib_init (&ip4_af, address,
910 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
911 vec_add1 (addr_fib, ip4_af);
914 * there is no support for adj-fib handling in the presence of overlapping
915 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
921 /* When adding an address check that it does not conflict
922 with an existing address. */
923 ip_interface_address_t *ia;
924 foreach_ip_interface_address
925 (&im->lookup_main, ia, sw_if_index,
926 0 /* honor unnumbered */ ,
929 ip_interface_address_get_address
930 (&im->lookup_main, ia);
931 if (ip4_destination_matches_route
932 (im, address, x, ia->address_length) ||
933 ip4_destination_matches_route (im,
939 ("failed to add %U which conflicts with %U for interface %U",
940 format_ip4_address_and_length, address,
942 format_ip4_address_and_length, x,
944 format_vnet_sw_if_index_name, vnm,
950 elts_before = pool_elts (lm->if_address_pool);
952 error = ip_interface_address_add_del
953 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
957 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
960 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
962 ip4_add_interface_routes (sw_if_index,
963 im, ip4_af.fib_index,
965 (lm->if_address_pool, if_address_index));
967 /* If pool did not grow/shrink: add duplicate address. */
968 if (elts_before != pool_elts (lm->if_address_pool))
970 ip4_add_del_interface_address_callback_t *cb;
971 vec_foreach (cb, im->add_del_interface_address_callbacks)
972 cb->function (im, cb->function_opaque, sw_if_index,
973 address, address_length, if_address_index, is_del);
982 ip4_add_del_interface_address (vlib_main_t * vm,
984 ip4_address_t * address,
985 u32 address_length, u32 is_del)
987 return ip4_add_del_interface_address_internal
988 (vm, sw_if_index, address, address_length, is_del);
991 /* Built-in ip4 unicast rx feature path definition */
993 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
995 .arc_name = "ip4-unicast",
996 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
997 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
1000 VNET_FEATURE_INIT (ip4_flow_classify, static) =
1002 .arc_name = "ip4-unicast",
1003 .node_name = "ip4-flow-classify",
1004 .runs_before = VNET_FEATURES ("ip4-inacl"),
1007 VNET_FEATURE_INIT (ip4_inacl, static) =
1009 .arc_name = "ip4-unicast",
1010 .node_name = "ip4-inacl",
1011 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
1014 VNET_FEATURE_INIT (ip4_source_check_1, static) =
1016 .arc_name = "ip4-unicast",
1017 .node_name = "ip4-source-check-via-rx",
1018 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
1021 VNET_FEATURE_INIT (ip4_source_check_2, static) =
1023 .arc_name = "ip4-unicast",
1024 .node_name = "ip4-source-check-via-any",
1025 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1028 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
1030 .arc_name = "ip4-unicast",
1031 .node_name = "ip4-source-and-port-range-check-rx",
1032 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1035 VNET_FEATURE_INIT (ip4_policer_classify, static) =
1037 .arc_name = "ip4-unicast",
1038 .node_name = "ip4-policer-classify",
1039 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1042 VNET_FEATURE_INIT (ip4_ipsec, static) =
1044 .arc_name = "ip4-unicast",
1045 .node_name = "ipsec-input-ip4",
1046 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1049 VNET_FEATURE_INIT (ip4_vpath, static) =
1051 .arc_name = "ip4-unicast",
1052 .node_name = "vpath-input-ip4",
1053 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1056 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1058 .arc_name = "ip4-unicast",
1059 .node_name = "ip4-vxlan-bypass",
1060 .runs_before = VNET_FEATURES ("ip4-lookup"),
1063 VNET_FEATURE_INIT (ip4_drop, static) =
1065 .arc_name = "ip4-unicast",
1066 .node_name = "ip4-drop",
1067 .runs_before = VNET_FEATURES ("ip4-lookup"),
1070 VNET_FEATURE_INIT (ip4_lookup, static) =
1072 .arc_name = "ip4-unicast",
1073 .node_name = "ip4-lookup",
1074 .runs_before = 0, /* not before any other features */
1077 /* Built-in ip4 multicast rx feature path definition */
1078 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1080 .arc_name = "ip4-multicast",
1081 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1082 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1085 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1087 .arc_name = "ip4-multicast",
1088 .node_name = "vpath-input-ip4",
1089 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1092 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1094 .arc_name = "ip4-multicast",
1095 .node_name = "ip4-drop",
1096 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1099 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1101 .arc_name = "ip4-multicast",
1102 .node_name = "ip4-mfib-forward-lookup",
1103 .runs_before = 0, /* last feature */
1106 /* Source and port-range check ip4 tx feature path definition */
1107 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1109 .arc_name = "ip4-output",
1110 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1111 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1114 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1116 .arc_name = "ip4-output",
1117 .node_name = "ip4-source-and-port-range-check-tx",
1118 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1121 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1123 .arc_name = "ip4-output",
1124 .node_name = "ipsec-output-ip4",
1125 .runs_before = VNET_FEATURES ("interface-output"),
1128 /* Built-in ip4 tx feature path definition */
1129 VNET_FEATURE_INIT (ip4_interface_output, static) =
1131 .arc_name = "ip4-output",
1132 .node_name = "interface-output",
1133 .runs_before = 0, /* not before any other features */
1137 static clib_error_t *
1138 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1140 ip4_main_t *im = &ip4_main;
1142 /* Fill in lookup tables with default table (0). */
1143 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1144 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1148 ip4_main_t *im4 = &ip4_main;
1149 ip_lookup_main_t *lm4 = &im4->lookup_main;
1150 ip_interface_address_t *ia = 0;
1151 ip4_address_t *address;
1152 vlib_main_t *vm = vlib_get_main ();
1155 foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* honor unnumbered */,
1157 address = ip_interface_address_get_address (lm4, ia);
1158 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1163 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1166 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1169 return /* no error */ 0;
1172 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1174 /* Global IP4 main. */
1175 ip4_main_t ip4_main;
1178 ip4_lookup_init (vlib_main_t * vm)
1180 ip4_main_t *im = &ip4_main;
1181 clib_error_t *error;
1184 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1187 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1192 m = pow2_mask (i) << (32 - i);
1195 im->fib_masks[i] = clib_host_to_net_u32 (m);
1198 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1200 /* Create FIB with index 0 and table id of 0. */
1201 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1202 FIB_SOURCE_DEFAULT_ROUTE);
1203 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1204 MFIB_SOURCE_DEFAULT_ROUTE);
1208 pn = pg_get_node (ip4_lookup_node.index);
1209 pn->unformat_edit = unformat_pg_ip4_header;
1213 ethernet_arp_header_t h;
1215 memset (&h, 0, sizeof (h));
1217 /* Set target ethernet address to all zeros. */
1218 memset (h.ip4_over_ethernet[1].ethernet, 0,
1219 sizeof (h.ip4_over_ethernet[1].ethernet));
1221 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1222 #define _8(f,v) h.f = v;
1223 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1224 _16 (l3_type, ETHERNET_TYPE_IP4);
1225 _8 (n_l2_address_bytes, 6);
1226 _8 (n_l3_address_bytes, 4);
1227 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1231 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1234 /* alloc chunk size */ 8,
1241 VLIB_INIT_FUNCTION (ip4_lookup_init);
1245 /* Adjacency taken. */
1250 /* Packet data, possibly *after* rewrite. */
1251 u8 packet_data[64 - 1 * sizeof (u32)];
1253 ip4_forward_next_trace_t;
1256 format_ip4_forward_next_trace (u8 * s, va_list * args)
1258 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1259 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1260 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1261 uword indent = format_get_indent (s);
1262 s = format (s, "%U%U",
1263 format_white_space, indent,
1264 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1269 format_ip4_lookup_trace (u8 * s, va_list * args)
1271 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1272 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1273 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1274 uword indent = format_get_indent (s);
1276 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1277 t->fib_index, t->dpo_index, t->flow_hash);
1278 s = format (s, "\n%U%U",
1279 format_white_space, indent,
1280 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1285 format_ip4_rewrite_trace (u8 * s, va_list * args)
1287 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1288 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1289 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1290 uword indent = format_get_indent (s);
1292 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1293 t->fib_index, t->dpo_index, format_ip_adjacency,
1294 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1295 s = format (s, "\n%U%U",
1296 format_white_space, indent,
1297 format_ip_adjacency_packet_data,
1298 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1302 /* Common trace function for all ip4-forward next nodes. */
1304 ip4_forward_next_trace (vlib_main_t * vm,
1305 vlib_node_runtime_t * node,
1306 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1309 ip4_main_t *im = &ip4_main;
1311 n_left = frame->n_vectors;
1312 from = vlib_frame_vector_args (frame);
1317 vlib_buffer_t *b0, *b1;
1318 ip4_forward_next_trace_t *t0, *t1;
1320 /* Prefetch next iteration. */
1321 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1322 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1327 b0 = vlib_get_buffer (vm, bi0);
1328 b1 = vlib_get_buffer (vm, bi1);
1330 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1332 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1333 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1334 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1336 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1337 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1338 vec_elt (im->fib_index_by_sw_if_index,
1339 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1341 clib_memcpy (t0->packet_data,
1342 vlib_buffer_get_current (b0),
1343 sizeof (t0->packet_data));
1345 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1347 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1348 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1349 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1351 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1352 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1353 vec_elt (im->fib_index_by_sw_if_index,
1354 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1355 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1356 sizeof (t1->packet_data));
1366 ip4_forward_next_trace_t *t0;
1370 b0 = vlib_get_buffer (vm, bi0);
1372 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1374 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1375 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1376 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1378 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1379 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1380 vec_elt (im->fib_index_by_sw_if_index,
1381 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1382 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1383 sizeof (t0->packet_data));
1391 ip4_drop_or_punt (vlib_main_t * vm,
1392 vlib_node_runtime_t * node,
1393 vlib_frame_t * frame, ip4_error_t error_code)
1395 u32 *buffers = vlib_frame_vector_args (frame);
1396 uword n_packets = frame->n_vectors;
1398 vlib_error_drop_buffers (vm, node, buffers,
1402 ip4_input_node.index, error_code);
1404 if (node->flags & VLIB_NODE_FLAG_TRACE)
1405 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1411 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1413 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1417 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1419 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1423 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1425 .function = ip4_drop,
1427 .vector_size = sizeof (u32),
1428 .format_trace = format_ip4_forward_next_trace,
1435 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1437 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1439 .function = ip4_punt,
1441 .vector_size = sizeof (u32),
1442 .format_trace = format_ip4_forward_next_trace,
1449 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1452 /* Compute TCP/UDP/ICMP4 checksum in software. */
1454 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1458 u32 ip_header_length, payload_length_host_byte_order;
1459 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1461 void *data_this_buffer;
1463 /* Initialize checksum with ip header. */
1464 ip_header_length = ip4_header_bytes (ip0);
1465 payload_length_host_byte_order =
1466 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1468 clib_host_to_net_u32 (payload_length_host_byte_order +
1469 (ip0->protocol << 16));
1471 if (BITS (uword) == 32)
1474 ip_csum_with_carry (sum0,
1475 clib_mem_unaligned (&ip0->src_address, u32));
1477 ip_csum_with_carry (sum0,
1478 clib_mem_unaligned (&ip0->dst_address, u32));
1482 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1484 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1485 data_this_buffer = (void *) ip0 + ip_header_length;
1486 n_ip_bytes_this_buffer = p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1487 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1489 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1490 n_ip_bytes_this_buffer - ip_header_length : 0;
1494 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1495 n_bytes_left -= n_this_buffer;
1496 if (n_bytes_left == 0)
1499 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1500 p0 = vlib_get_buffer (vm, p0->next_buffer);
1501 data_this_buffer = vlib_buffer_get_current (p0);
1502 n_this_buffer = p0->current_length;
1505 sum16 = ~ip_csum_fold (sum0);
1511 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1513 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1517 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1518 || ip0->protocol == IP_PROTOCOL_UDP);
1520 udp0 = (void *) (ip0 + 1);
1521 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1523 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1524 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1528 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1530 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1531 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1537 VNET_FEATURE_ARC_INIT (ip4_local) =
1539 .arc_name = "ip4-local",
1540 .start_nodes = VNET_FEATURES ("ip4-local"),
1545 ip4_local_validate_l4 (vlib_main_t * vm, vlib_buffer_t * p, ip4_header_t * ip,
1546 u8 is_udp, u8 * error, u8 * good_tcp_udp)
1549 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1550 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1554 u32 ip_len, udp_len;
1556 udp = ip4_next_header (ip);
1557 /* Verify UDP length. */
1558 ip_len = clib_net_to_host_u16 (ip->length);
1559 udp_len = clib_net_to_host_u16 (udp->length);
1561 len_diff = ip_len - udp_len;
1562 *good_tcp_udp &= len_diff >= 0;
1563 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1567 #define ip4_local_do_l4_check(is_tcp_udp, flags) \
1568 (is_tcp_udp && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1571 ip4_local_inline (vlib_main_t * vm,
1572 vlib_node_runtime_t * node,
1573 vlib_frame_t * frame, int head_of_feature_arc)
1575 ip4_main_t *im = &ip4_main;
1576 ip_lookup_main_t *lm = &im->lookup_main;
1577 ip_local_next_t next_index;
1578 u32 *from, *to_next, n_left_from, n_left_to_next;
1579 vlib_node_runtime_t *error_node =
1580 vlib_node_get_runtime (vm, ip4_input_node.index);
1581 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1583 from = vlib_frame_vector_args (frame);
1584 n_left_from = frame->n_vectors;
1585 next_index = node->cached_next_index;
1587 if (node->flags & VLIB_NODE_FLAG_TRACE)
1588 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1590 while (n_left_from > 0)
1592 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1594 while (n_left_from >= 4 && n_left_to_next >= 2)
1596 vlib_buffer_t *p0, *p1;
1597 ip4_header_t *ip0, *ip1;
1598 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1599 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1600 const dpo_id_t *dpo0, *dpo1;
1601 const load_balance_t *lb0, *lb1;
1602 u32 pi0, next0, fib_index0, lbi0;
1603 u32 pi1, next1, fib_index1, lbi1;
1604 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1605 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1606 u32 sw_if_index0, sw_if_index1;
1608 pi0 = to_next[0] = from[0];
1609 pi1 = to_next[1] = from[1];
1613 n_left_to_next -= 2;
1615 next0 = next1 = IP_LOCAL_NEXT_DROP;
1616 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1618 p0 = vlib_get_buffer (vm, pi0);
1619 p1 = vlib_get_buffer (vm, pi1);
1621 ip0 = vlib_buffer_get_current (p0);
1622 ip1 = vlib_buffer_get_current (p1);
1624 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1625 vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1627 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1628 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1630 /* Treat IP frag packets as "experimental" protocol for now
1631 until support of IP frag reassembly is implemented */
1632 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1633 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1635 if (head_of_feature_arc == 0)
1638 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1639 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1640 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1641 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1644 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1646 (p1->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1648 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)
1649 || ip4_local_do_l4_check (is_tcp_udp1,
1653 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1656 ip4_local_validate_l4 (vm, p1, ip1, is_udp1, &error1,
1660 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1661 error0 = (is_tcp_udp0 && !good_tcp_udp0
1662 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1663 error1 = (is_tcp_udp1 && !good_tcp_udp1
1664 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1666 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1668 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1669 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1671 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1673 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1674 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1676 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1677 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1679 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1680 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1681 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1683 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1685 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1687 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1690 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1691 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1692 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1694 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1695 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1696 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1698 lb0 = load_balance_get (lbi0);
1699 lb1 = load_balance_get (lbi1);
1700 dpo0 = load_balance_get_bucket_i (lb0, 0);
1701 dpo1 = load_balance_get_bucket_i (lb1, 0);
1704 * Must have a route to source otherwise we drop the packet.
1705 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1708 * - the source is a recieve => it's from us => bogus, do this
1709 * first since it sets a different error code.
1710 * - uRPF check for any route to source - accept if passes.
1711 * - allow packets destined to the broadcast address from unknown sources
1713 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1714 dpo0->dpoi_type == DPO_RECEIVE) ?
1715 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1716 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1717 !fib_urpf_check_size (lb0->lb_urpf) &&
1718 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1719 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1720 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1721 dpo1->dpoi_type == DPO_RECEIVE) ?
1722 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1723 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1724 !fib_urpf_check_size (lb1->lb_urpf) &&
1725 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1726 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1730 next0 = lm->local_next_by_ip_protocol[proto0];
1731 next1 = lm->local_next_by_ip_protocol[proto1];
1734 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1736 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1738 p0->error = error0 ? error_node->errors[error0] : 0;
1739 p1->error = error1 ? error_node->errors[error1] : 0;
1741 if (head_of_feature_arc)
1743 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1744 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1745 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1746 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1749 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1750 n_left_to_next, pi0, pi1,
1754 while (n_left_from > 0 && n_left_to_next > 0)
1758 ip4_fib_mtrie_t *mtrie0;
1759 ip4_fib_mtrie_leaf_t leaf0;
1760 u32 pi0, next0, fib_index0, lbi0;
1761 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1762 load_balance_t *lb0;
1763 const dpo_id_t *dpo0;
1766 pi0 = to_next[0] = from[0];
1770 n_left_to_next -= 1;
1772 next0 = IP_LOCAL_NEXT_DROP;
1773 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1775 p0 = vlib_get_buffer (vm, pi0);
1776 ip0 = vlib_buffer_get_current (p0);
1777 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1778 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1780 /* Treat IP frag packets as "experimental" protocol for now
1781 until support of IP frag reassembly is implemented */
1782 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1784 if (head_of_feature_arc == 0)
1787 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1788 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1790 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1792 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)))
1794 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1798 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1799 error0 = (is_tcp_udp0 && !good_tcp_udp0
1800 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1802 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1804 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1805 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1806 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1807 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1808 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1810 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1812 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1813 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1814 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1816 lb0 = load_balance_get (lbi0);
1817 dpo0 = load_balance_get_bucket_i (lb0, 0);
1819 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1820 dpo0->dpoi_type == DPO_RECEIVE) ?
1821 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1822 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1823 !fib_urpf_check_size (lb0->lb_urpf) &&
1824 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1825 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1828 next0 = lm->local_next_by_ip_protocol[proto0];
1830 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1832 p0->error = error0 ? error_node->errors[error0] : 0;
1834 if (head_of_feature_arc)
1836 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1837 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1840 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1841 n_left_to_next, pi0, next0);
1843 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1846 return frame->n_vectors;
1850 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1852 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1856 VLIB_REGISTER_NODE (ip4_local_node) =
1858 .function = ip4_local,
1859 .name = "ip4-local",
1860 .vector_size = sizeof (u32),
1861 .format_trace = format_ip4_forward_next_trace,
1862 .n_next_nodes = IP_LOCAL_N_NEXT,
1865 [IP_LOCAL_NEXT_DROP] = "error-drop",
1866 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1867 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1868 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1873 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1876 ip4_local_end_of_arc (vlib_main_t * vm,
1877 vlib_node_runtime_t * node, vlib_frame_t * frame)
1879 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1883 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1884 .function = ip4_local_end_of_arc,
1885 .name = "ip4-local-end-of-arc",
1886 .vector_size = sizeof (u32),
1888 .format_trace = format_ip4_forward_next_trace,
1889 .sibling_of = "ip4-local",
1892 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1894 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1895 .arc_name = "ip4-local",
1896 .node_name = "ip4-local-end-of-arc",
1897 .runs_before = 0, /* not before any other features */
1902 ip4_register_protocol (u32 protocol, u32 node_index)
1904 vlib_main_t *vm = vlib_get_main ();
1905 ip4_main_t *im = &ip4_main;
1906 ip_lookup_main_t *lm = &im->lookup_main;
1908 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1909 lm->local_next_by_ip_protocol[protocol] =
1910 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1913 static clib_error_t *
1914 show_ip_local_command_fn (vlib_main_t * vm,
1915 unformat_input_t * input, vlib_cli_command_t * cmd)
1917 ip4_main_t *im = &ip4_main;
1918 ip_lookup_main_t *lm = &im->lookup_main;
1921 vlib_cli_output (vm, "Protocols handled by ip4_local");
1922 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1924 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1926 u32 node_index = vlib_get_node (vm,
1927 ip4_local_node.index)->
1928 next_nodes[lm->local_next_by_ip_protocol[i]];
1929 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1939 * Display the set of protocols handled by the local IPv4 stack.
1942 * Example of how to display local protocol table:
1943 * @cliexstart{show ip local}
1944 * Protocols handled by ip4_local
1951 VLIB_CLI_COMMAND (show_ip_local, static) =
1953 .path = "show ip local",
1954 .function = show_ip_local_command_fn,
1955 .short_help = "show ip local",
1960 ip4_arp_inline (vlib_main_t * vm,
1961 vlib_node_runtime_t * node,
1962 vlib_frame_t * frame, int is_glean)
1964 vnet_main_t *vnm = vnet_get_main ();
1965 ip4_main_t *im = &ip4_main;
1966 ip_lookup_main_t *lm = &im->lookup_main;
1967 u32 *from, *to_next_drop;
1968 uword n_left_from, n_left_to_next_drop, next_index;
1969 static f64 time_last_seed_change = -1e100;
1970 static u32 hash_seeds[3];
1971 static uword hash_bitmap[256 / BITS (uword)];
1974 if (node->flags & VLIB_NODE_FLAG_TRACE)
1975 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1977 time_now = vlib_time_now (vm);
1978 if (time_now - time_last_seed_change > 1e-3)
1981 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
1982 sizeof (hash_seeds));
1983 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1984 hash_seeds[i] = r[i];
1986 /* Mark all hash keys as been no-seen before. */
1987 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1990 time_last_seed_change = time_now;
1993 from = vlib_frame_vector_args (frame);
1994 n_left_from = frame->n_vectors;
1995 next_index = node->cached_next_index;
1996 if (next_index == IP4_ARP_NEXT_DROP)
1997 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1999 while (n_left_from > 0)
2001 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2002 to_next_drop, n_left_to_next_drop);
2004 while (n_left_from > 0 && n_left_to_next_drop > 0)
2006 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2007 ip_adjacency_t *adj0;
2014 p0 = vlib_get_buffer (vm, pi0);
2016 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2017 adj0 = adj_get (adj_index0);
2018 ip0 = vlib_buffer_get_current (p0);
2024 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2025 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2030 * this is the Glean case, so we are ARPing for the
2031 * packet's destination
2033 a0 ^= ip0->dst_address.data_u32;
2037 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2041 hash_v3_mix32 (a0, b0, c0);
2042 hash_v3_finalize32 (a0, b0, c0);
2044 c0 &= BITS (hash_bitmap) - 1;
2045 m0 = (uword) 1 << (c0 % BITS (uword));
2046 c0 = c0 / BITS (uword);
2048 bm0 = hash_bitmap[c0];
2049 drop0 = (bm0 & m0) != 0;
2051 /* Mark it as seen. */
2052 hash_bitmap[c0] = bm0 | m0;
2056 to_next_drop[0] = pi0;
2058 n_left_to_next_drop -= 1;
2061 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2062 IP4_ARP_ERROR_REQUEST_SENT];
2065 * the adj has been updated to a rewrite but the node the DPO that got
2066 * us here hasn't - yet. no big deal. we'll drop while we wait.
2068 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2075 * Can happen if the control-plane is programming tables
2076 * with traffic flowing; at least that's today's lame excuse.
2078 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2079 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2081 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2084 /* Send ARP request. */
2088 ethernet_arp_header_t *h0;
2089 vnet_hw_interface_t *hw_if0;
2092 vlib_packet_template_get_packet (vm,
2093 &im->ip4_arp_request_packet_template,
2096 /* Add rewrite/encap string for ARP packet. */
2097 vnet_rewrite_one_header (adj0[0], h0,
2098 sizeof (ethernet_header_t));
2100 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2102 /* Src ethernet address in ARP header. */
2103 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2105 sizeof (h0->ip4_over_ethernet[0].ethernet));
2109 /* The interface's source address is stashed in the Glean Adj */
2110 h0->ip4_over_ethernet[0].ip4 =
2111 adj0->sub_type.glean.receive_addr.ip4;
2113 /* Copy in destination address we are requesting. This is the
2114 * glean case, so it's the packet's destination.*/
2115 h0->ip4_over_ethernet[1].ip4.data_u32 =
2116 ip0->dst_address.data_u32;
2120 /* Src IP address in ARP header. */
2121 if (ip4_src_address_for_packet (lm, sw_if_index0,
2123 ip4_over_ethernet[0].ip4))
2125 /* No source address available */
2127 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2128 vlib_buffer_free (vm, &bi0, 1);
2132 /* Copy in destination address we are requesting from the
2134 h0->ip4_over_ethernet[1].ip4.data_u32 =
2135 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2138 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2139 b0 = vlib_get_buffer (vm, bi0);
2140 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
2141 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2143 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2145 vlib_set_next_frame_buffer (vm, node,
2146 adj0->rewrite_header.next_index,
2151 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2154 return frame->n_vectors;
2158 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2160 return (ip4_arp_inline (vm, node, frame, 0));
2164 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2166 return (ip4_arp_inline (vm, node, frame, 1));
2169 static char *ip4_arp_error_strings[] = {
2170 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2171 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2172 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2173 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2174 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2175 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2178 VLIB_REGISTER_NODE (ip4_arp_node) =
2180 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2181 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2182 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2183 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2185 [IP4_ARP_NEXT_DROP] = "error-drop",}
2188 VLIB_REGISTER_NODE (ip4_glean_node) =
2190 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2191 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2192 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2193 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2195 [IP4_ARP_NEXT_DROP] = "error-drop",}
2198 #define foreach_notrace_ip4_arp_error \
2205 arp_notrace_init (vlib_main_t * vm)
2207 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2209 /* don't trace ARP request packets */
2211 vnet_pcap_drop_trace_filter_add_del \
2212 (rt->errors[IP4_ARP_ERROR_##a], \
2214 foreach_notrace_ip4_arp_error;
2219 VLIB_INIT_FUNCTION (arp_notrace_init);
2222 /* Send an ARP request to see if given destination is reachable on given interface. */
2224 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2226 vnet_main_t *vnm = vnet_get_main ();
2227 ip4_main_t *im = &ip4_main;
2228 ethernet_arp_header_t *h;
2230 ip_interface_address_t *ia;
2231 ip_adjacency_t *adj;
2232 vnet_hw_interface_t *hi;
2233 vnet_sw_interface_t *si;
2238 si = vnet_get_sw_interface (vnm, sw_if_index);
2240 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2242 return clib_error_return (0, "%U: interface %U down",
2243 format_ip4_address, dst,
2244 format_vnet_sw_if_index_name, vnm,
2249 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2252 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2253 return clib_error_return
2255 "no matching interface address for destination %U (interface %U)",
2256 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2260 ip46_address_t nh = {
2264 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2265 VNET_LINK_IP4, &nh, sw_if_index);
2268 h = vlib_packet_template_get_packet (vm,
2269 &im->ip4_arp_request_packet_template,
2272 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2273 if (PREDICT_FALSE (!hi->hw_address))
2275 return clib_error_return (0, "%U: interface %U do not support ip probe",
2276 format_ip4_address, dst,
2277 format_vnet_sw_if_index_name, vnm,
2281 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2282 sizeof (h->ip4_over_ethernet[0].ethernet));
2284 h->ip4_over_ethernet[0].ip4 = src[0];
2285 h->ip4_over_ethernet[1].ip4 = dst[0];
2287 b = vlib_get_buffer (vm, bi);
2288 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2289 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2291 /* Add encapsulation string for software interface (e.g. ethernet header). */
2292 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2293 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2296 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2297 u32 *to_next = vlib_frame_vector_args (f);
2300 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2304 return /* no error */ 0;
2309 IP4_REWRITE_NEXT_DROP,
2310 IP4_REWRITE_NEXT_ICMP_ERROR,
2311 } ip4_rewrite_next_t;
2314 ip4_rewrite_inline (vlib_main_t * vm,
2315 vlib_node_runtime_t * node,
2316 vlib_frame_t * frame,
2317 int do_counters, int is_midchain, int is_mcast)
2319 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2320 u32 *from = vlib_frame_vector_args (frame);
2321 u32 n_left_from, n_left_to_next, *to_next, next_index;
2322 vlib_node_runtime_t *error_node =
2323 vlib_node_get_runtime (vm, ip4_input_node.index);
2325 n_left_from = frame->n_vectors;
2326 next_index = node->cached_next_index;
2327 u32 thread_index = vlib_get_thread_index ();
2329 while (n_left_from > 0)
2331 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2333 while (n_left_from >= 4 && n_left_to_next >= 2)
2335 ip_adjacency_t *adj0, *adj1;
2336 vlib_buffer_t *p0, *p1;
2337 ip4_header_t *ip0, *ip1;
2338 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2339 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2340 u32 tx_sw_if_index0, tx_sw_if_index1;
2342 /* Prefetch next iteration. */
2344 vlib_buffer_t *p2, *p3;
2346 p2 = vlib_get_buffer (vm, from[2]);
2347 p3 = vlib_get_buffer (vm, from[3]);
2349 vlib_prefetch_buffer_header (p2, STORE);
2350 vlib_prefetch_buffer_header (p3, STORE);
2352 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2353 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2356 pi0 = to_next[0] = from[0];
2357 pi1 = to_next[1] = from[1];
2362 n_left_to_next -= 2;
2364 p0 = vlib_get_buffer (vm, pi0);
2365 p1 = vlib_get_buffer (vm, pi1);
2367 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2368 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2371 * pre-fetch the per-adjacency counters
2375 vlib_prefetch_combined_counter (&adjacency_counters,
2376 thread_index, adj_index0);
2377 vlib_prefetch_combined_counter (&adjacency_counters,
2378 thread_index, adj_index1);
2381 ip0 = vlib_buffer_get_current (p0);
2382 ip1 = vlib_buffer_get_current (p1);
2384 error0 = error1 = IP4_ERROR_NONE;
2385 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2387 /* Decrement TTL & update checksum.
2388 Works either endian, so no need for byte swap. */
2389 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2391 i32 ttl0 = ip0->ttl;
2393 /* Input node should have reject packets with ttl 0. */
2394 ASSERT (ip0->ttl > 0);
2396 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2397 checksum0 += checksum0 >= 0xffff;
2399 ip0->checksum = checksum0;
2404 * If the ttl drops below 1 when forwarding, generate
2407 if (PREDICT_FALSE (ttl0 <= 0))
2409 error0 = IP4_ERROR_TIME_EXPIRED;
2410 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2411 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2412 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2414 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2417 /* Verify checksum. */
2418 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2419 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2423 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2425 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2427 i32 ttl1 = ip1->ttl;
2429 /* Input node should have reject packets with ttl 0. */
2430 ASSERT (ip1->ttl > 0);
2432 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2433 checksum1 += checksum1 >= 0xffff;
2435 ip1->checksum = checksum1;
2440 * If the ttl drops below 1 when forwarding, generate
2443 if (PREDICT_FALSE (ttl1 <= 0))
2445 error1 = IP4_ERROR_TIME_EXPIRED;
2446 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2447 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2448 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2450 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2453 /* Verify checksum. */
2454 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2455 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2459 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2462 /* Rewrite packet header and updates lengths. */
2463 adj0 = adj_get (adj_index0);
2464 adj1 = adj_get (adj_index1);
2466 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2467 rw_len0 = adj0[0].rewrite_header.data_bytes;
2468 rw_len1 = adj1[0].rewrite_header.data_bytes;
2469 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2470 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2472 /* Check MTU of outgoing interface. */
2474 (vlib_buffer_length_in_chain (vm, p0) >
2476 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2479 (vlib_buffer_length_in_chain (vm, p1) >
2481 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2484 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2485 * to see the IP headerr */
2486 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2488 next0 = adj0[0].rewrite_header.next_index;
2489 p0->current_data -= rw_len0;
2490 p0->current_length += rw_len0;
2491 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2492 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2495 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2496 vnet_feature_arc_start (lm->output_feature_arc_index,
2497 tx_sw_if_index0, &next0, p0);
2499 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2501 next1 = adj1[0].rewrite_header.next_index;
2502 p1->current_data -= rw_len1;
2503 p1->current_length += rw_len1;
2505 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2506 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2509 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2510 vnet_feature_arc_start (lm->output_feature_arc_index,
2511 tx_sw_if_index1, &next1, p1);
2514 /* Guess we are only writing on simple Ethernet header. */
2515 vnet_rewrite_two_headers (adj0[0], adj1[0],
2516 ip0, ip1, sizeof (ethernet_header_t));
2519 * Bump the per-adjacency counters
2523 vlib_increment_combined_counter
2524 (&adjacency_counters,
2527 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2529 vlib_increment_combined_counter
2530 (&adjacency_counters,
2533 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2538 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2539 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2544 * copy bytes from the IP address into the MAC rewrite
2546 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2547 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2550 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2551 to_next, n_left_to_next,
2552 pi0, pi1, next0, next1);
2555 while (n_left_from > 0 && n_left_to_next > 0)
2557 ip_adjacency_t *adj0;
2560 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2561 u32 tx_sw_if_index0;
2563 pi0 = to_next[0] = from[0];
2565 p0 = vlib_get_buffer (vm, pi0);
2567 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2569 adj0 = adj_get (adj_index0);
2571 ip0 = vlib_buffer_get_current (p0);
2573 error0 = IP4_ERROR_NONE;
2574 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2576 /* Decrement TTL & update checksum. */
2577 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2579 i32 ttl0 = ip0->ttl;
2581 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2583 checksum0 += checksum0 >= 0xffff;
2585 ip0->checksum = checksum0;
2587 ASSERT (ip0->ttl > 0);
2593 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2594 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2596 if (PREDICT_FALSE (ttl0 <= 0))
2599 * If the ttl drops below 1 when forwarding, generate
2602 error0 = IP4_ERROR_TIME_EXPIRED;
2603 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2604 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2605 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2606 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2612 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2616 vlib_prefetch_combined_counter (&adjacency_counters,
2617 thread_index, adj_index0);
2619 /* Guess we are only writing on simple Ethernet header. */
2620 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2624 * copy bytes from the IP address into the MAC rewrite
2626 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2629 /* Update packet buffer attributes/set output interface. */
2630 rw_len0 = adj0[0].rewrite_header.data_bytes;
2631 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2634 vlib_increment_combined_counter
2635 (&adjacency_counters,
2636 thread_index, adj_index0, 1,
2637 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2639 /* Check MTU of outgoing interface. */
2640 error0 = (vlib_buffer_length_in_chain (vm, p0)
2641 > adj0[0].rewrite_header.max_l3_packet_bytes
2642 ? IP4_ERROR_MTU_EXCEEDED : error0);
2644 p0->error = error_node->errors[error0];
2646 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2647 * to see the IP headerr */
2648 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2650 p0->current_data -= rw_len0;
2651 p0->current_length += rw_len0;
2652 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2654 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2655 next0 = adj0[0].rewrite_header.next_index;
2659 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2663 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2664 vnet_feature_arc_start (lm->output_feature_arc_index,
2665 tx_sw_if_index0, &next0, p0);
2672 n_left_to_next -= 1;
2674 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2675 to_next, n_left_to_next,
2679 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2682 /* Need to do trace after rewrites to pick up new packet data. */
2683 if (node->flags & VLIB_NODE_FLAG_TRACE)
2684 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2686 return frame->n_vectors;
2690 /** @brief IPv4 rewrite node.
2693 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2694 header checksum, fetch the ip adjacency, check the outbound mtu,
2695 apply the adjacency rewrite, and send pkts to the adjacency
2696 rewrite header's rewrite_next_index.
2698 @param vm vlib_main_t corresponding to the current thread
2699 @param node vlib_node_runtime_t
2700 @param frame vlib_frame_t whose contents should be dispatched
2702 @par Graph mechanics: buffer metadata, next index usage
2705 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2706 - the rewrite adjacency index
2707 - <code>adj->lookup_next_index</code>
2708 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2709 the packet will be dropped.
2710 - <code>adj->rewrite_header</code>
2711 - Rewrite string length, rewrite string, next_index
2714 - <code>b->current_data, b->current_length</code>
2715 - Updated net of applying the rewrite string
2717 <em>Next Indices:</em>
2718 - <code> adj->rewrite_header.next_index </code>
2722 ip4_rewrite (vlib_main_t * vm,
2723 vlib_node_runtime_t * node, vlib_frame_t * frame)
2725 if (adj_are_counters_enabled ())
2726 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2728 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2732 ip4_midchain (vlib_main_t * vm,
2733 vlib_node_runtime_t * node, vlib_frame_t * frame)
2735 if (adj_are_counters_enabled ())
2736 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2738 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2742 ip4_rewrite_mcast (vlib_main_t * vm,
2743 vlib_node_runtime_t * node, vlib_frame_t * frame)
2745 if (adj_are_counters_enabled ())
2746 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2748 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2752 ip4_mcast_midchain (vlib_main_t * vm,
2753 vlib_node_runtime_t * node, vlib_frame_t * frame)
2755 if (adj_are_counters_enabled ())
2756 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2758 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2762 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2763 .function = ip4_rewrite,
2764 .name = "ip4-rewrite",
2765 .vector_size = sizeof (u32),
2767 .format_trace = format_ip4_rewrite_trace,
2771 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2772 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2775 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2777 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2778 .function = ip4_rewrite_mcast,
2779 .name = "ip4-rewrite-mcast",
2780 .vector_size = sizeof (u32),
2782 .format_trace = format_ip4_rewrite_trace,
2783 .sibling_of = "ip4-rewrite",
2785 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2787 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2788 .function = ip4_mcast_midchain,
2789 .name = "ip4-mcast-midchain",
2790 .vector_size = sizeof (u32),
2792 .format_trace = format_ip4_rewrite_trace,
2793 .sibling_of = "ip4-rewrite",
2795 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2797 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2798 .function = ip4_midchain,
2799 .name = "ip4-midchain",
2800 .vector_size = sizeof (u32),
2801 .format_trace = format_ip4_forward_next_trace,
2802 .sibling_of = "ip4-rewrite",
2804 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2808 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2810 ip4_fib_mtrie_t *mtrie0;
2811 ip4_fib_mtrie_leaf_t leaf0;
2814 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2816 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2817 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2818 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2820 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2822 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2825 static clib_error_t *
2826 test_lookup_command_fn (vlib_main_t * vm,
2827 unformat_input_t * input, vlib_cli_command_t * cmd)
2834 ip4_address_t ip4_base_address;
2837 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2839 if (unformat (input, "table %d", &table_id))
2841 /* Make sure the entry exists. */
2842 fib = ip4_fib_get (table_id);
2843 if ((fib) && (fib->index != table_id))
2844 return clib_error_return (0, "<fib-index> %d does not exist",
2847 else if (unformat (input, "count %f", &count))
2850 else if (unformat (input, "%U",
2851 unformat_ip4_address, &ip4_base_address))
2854 return clib_error_return (0, "unknown input `%U'",
2855 format_unformat_error, input);
2860 for (i = 0; i < n; i++)
2862 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2865 ip4_base_address.as_u32 =
2866 clib_host_to_net_u32 (1 +
2867 clib_net_to_host_u32 (ip4_base_address.as_u32));
2871 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2873 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2879 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2880 * given FIB table to determine if there is a conflict with the
2881 * adjacency table. The fib-id can be determined by using the
2882 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2885 * @todo This command uses fib-id, other commands use table-id (not
2886 * just a name, they are different indexes). Would like to change this
2887 * to table-id for consistency.
2890 * Example of how to run the test lookup command:
2891 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2892 * No errors in 2 lookups
2896 VLIB_CLI_COMMAND (lookup_test_command, static) =
2898 .path = "test lookup",
2899 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2900 .function = test_lookup_command_fn,
2905 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2909 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2911 if (~0 == fib_index)
2912 return VNET_API_ERROR_NO_SUCH_FIB;
2914 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2920 static clib_error_t *
2921 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2922 unformat_input_t * input,
2923 vlib_cli_command_t * cmd)
2927 u32 flow_hash_config = 0;
2930 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2932 if (unformat (input, "table %d", &table_id))
2935 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2936 foreach_flow_hash_bit
2943 return clib_error_return (0, "unknown input `%U'",
2944 format_unformat_error, input);
2946 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2952 case VNET_API_ERROR_NO_SUCH_FIB:
2953 return clib_error_return (0, "no such FIB table %d", table_id);
2956 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2964 * Configure the set of IPv4 fields used by the flow hash.
2967 * Example of how to set the flow hash on a given table:
2968 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2969 * Example of display the configured flow hash:
2970 * @cliexstart{show ip fib}
2971 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2974 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2975 * [0] [@0]: dpo-drop ip6
2978 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2979 * [0] [@0]: dpo-drop ip6
2982 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2983 * [0] [@0]: dpo-drop ip6
2986 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2987 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2990 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2991 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2992 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2993 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2994 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2997 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2998 * [0] [@0]: dpo-drop ip6
2999 * 255.255.255.255/32
3001 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3002 * [0] [@0]: dpo-drop ip6
3003 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3006 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3007 * [0] [@0]: dpo-drop ip6
3010 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3011 * [0] [@0]: dpo-drop ip6
3014 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3015 * [0] [@4]: ipv4-glean: af_packet0
3018 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3019 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3022 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3023 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3026 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3027 * [0] [@4]: ipv4-glean: af_packet1
3030 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3031 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3034 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3035 * [0] [@0]: dpo-drop ip6
3038 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3039 * [0] [@0]: dpo-drop ip6
3040 * 255.255.255.255/32
3042 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3043 * [0] [@0]: dpo-drop ip6
3047 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3049 .path = "set ip flow-hash",
3051 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3052 .function = set_ip_flow_hash_command_fn,
3057 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3060 vnet_main_t *vnm = vnet_get_main ();
3061 vnet_interface_main_t *im = &vnm->interface_main;
3062 ip4_main_t *ipm = &ip4_main;
3063 ip_lookup_main_t *lm = &ipm->lookup_main;
3064 vnet_classify_main_t *cm = &vnet_classify_main;
3065 ip4_address_t *if_addr;
3067 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3068 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3070 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3071 return VNET_API_ERROR_NO_SUCH_ENTRY;
3073 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3074 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3076 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3078 if (NULL != if_addr)
3080 fib_prefix_t pfx = {
3082 .fp_proto = FIB_PROTOCOL_IP4,
3083 .fp_addr.ip4 = *if_addr,
3087 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3091 if (table_index != (u32) ~ 0)
3093 dpo_id_t dpo = DPO_INVALID;
3098 classify_dpo_create (DPO_PROTO_IP4, table_index));
3100 fib_table_entry_special_dpo_add (fib_index,
3102 FIB_SOURCE_CLASSIFY,
3103 FIB_ENTRY_FLAG_NONE, &dpo);
3108 fib_table_entry_special_remove (fib_index,
3109 &pfx, FIB_SOURCE_CLASSIFY);
3116 static clib_error_t *
3117 set_ip_classify_command_fn (vlib_main_t * vm,
3118 unformat_input_t * input,
3119 vlib_cli_command_t * cmd)
3121 u32 table_index = ~0;
3122 int table_index_set = 0;
3123 u32 sw_if_index = ~0;
3126 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3128 if (unformat (input, "table-index %d", &table_index))
3129 table_index_set = 1;
3130 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3131 vnet_get_main (), &sw_if_index))
3137 if (table_index_set == 0)
3138 return clib_error_return (0, "classify table-index must be specified");
3140 if (sw_if_index == ~0)
3141 return clib_error_return (0, "interface / subif must be specified");
3143 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3150 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3151 return clib_error_return (0, "No such interface");
3153 case VNET_API_ERROR_NO_SUCH_ENTRY:
3154 return clib_error_return (0, "No such classifier table");
3160 * Assign a classification table to an interface. The classification
3161 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3162 * commands. Once the table is create, use this command to filter packets
3166 * Example of how to assign a classification table to an interface:
3167 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3170 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3172 .path = "set ip classify",
3174 "set ip classify intfc <interface> table-index <classify-idx>",
3175 .function = set_ip_classify_command_fn,
3180 * fd.io coding-style-patch-verification: ON
3183 * eval: (c-set-style "gnu")