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 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1206 pn = pg_get_node (ip4_lookup_node.index);
1207 pn->unformat_edit = unformat_pg_ip4_header;
1211 ethernet_arp_header_t h;
1213 memset (&h, 0, sizeof (h));
1215 /* Set target ethernet address to all zeros. */
1216 memset (h.ip4_over_ethernet[1].ethernet, 0,
1217 sizeof (h.ip4_over_ethernet[1].ethernet));
1219 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1220 #define _8(f,v) h.f = v;
1221 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1222 _16 (l3_type, ETHERNET_TYPE_IP4);
1223 _8 (n_l2_address_bytes, 6);
1224 _8 (n_l3_address_bytes, 4);
1225 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1229 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1232 /* alloc chunk size */ 8,
1239 VLIB_INIT_FUNCTION (ip4_lookup_init);
1243 /* Adjacency taken. */
1248 /* Packet data, possibly *after* rewrite. */
1249 u8 packet_data[64 - 1 * sizeof (u32)];
1251 ip4_forward_next_trace_t;
1254 format_ip4_forward_next_trace (u8 * s, va_list * args)
1256 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1257 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1258 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1259 uword indent = format_get_indent (s);
1260 s = format (s, "%U%U",
1261 format_white_space, indent,
1262 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1267 format_ip4_lookup_trace (u8 * s, va_list * args)
1269 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1270 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1271 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1272 uword indent = format_get_indent (s);
1274 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1275 t->fib_index, t->dpo_index, t->flow_hash);
1276 s = format (s, "\n%U%U",
1277 format_white_space, indent,
1278 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1283 format_ip4_rewrite_trace (u8 * s, va_list * args)
1285 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1286 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1287 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1288 uword indent = format_get_indent (s);
1290 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1291 t->fib_index, t->dpo_index, format_ip_adjacency,
1292 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1293 s = format (s, "\n%U%U",
1294 format_white_space, indent,
1295 format_ip_adjacency_packet_data,
1296 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1300 /* Common trace function for all ip4-forward next nodes. */
1302 ip4_forward_next_trace (vlib_main_t * vm,
1303 vlib_node_runtime_t * node,
1304 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1307 ip4_main_t *im = &ip4_main;
1309 n_left = frame->n_vectors;
1310 from = vlib_frame_vector_args (frame);
1315 vlib_buffer_t *b0, *b1;
1316 ip4_forward_next_trace_t *t0, *t1;
1318 /* Prefetch next iteration. */
1319 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1320 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1325 b0 = vlib_get_buffer (vm, bi0);
1326 b1 = vlib_get_buffer (vm, bi1);
1328 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1330 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1331 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1332 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1334 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1335 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1336 vec_elt (im->fib_index_by_sw_if_index,
1337 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1339 clib_memcpy (t0->packet_data,
1340 vlib_buffer_get_current (b0),
1341 sizeof (t0->packet_data));
1343 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1345 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1346 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1347 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1349 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1350 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1351 vec_elt (im->fib_index_by_sw_if_index,
1352 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1353 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1354 sizeof (t1->packet_data));
1364 ip4_forward_next_trace_t *t0;
1368 b0 = vlib_get_buffer (vm, bi0);
1370 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1372 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1373 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1374 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1376 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1377 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1378 vec_elt (im->fib_index_by_sw_if_index,
1379 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1380 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1381 sizeof (t0->packet_data));
1389 ip4_drop_or_punt (vlib_main_t * vm,
1390 vlib_node_runtime_t * node,
1391 vlib_frame_t * frame, ip4_error_t error_code)
1393 u32 *buffers = vlib_frame_vector_args (frame);
1394 uword n_packets = frame->n_vectors;
1396 vlib_error_drop_buffers (vm, node, buffers,
1400 ip4_input_node.index, error_code);
1402 if (node->flags & VLIB_NODE_FLAG_TRACE)
1403 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1409 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1411 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1415 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1417 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1421 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1423 .function = ip4_drop,
1425 .vector_size = sizeof (u32),
1426 .format_trace = format_ip4_forward_next_trace,
1433 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1435 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1437 .function = ip4_punt,
1439 .vector_size = sizeof (u32),
1440 .format_trace = format_ip4_forward_next_trace,
1447 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1450 /* Compute TCP/UDP/ICMP4 checksum in software. */
1452 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1456 u32 ip_header_length, payload_length_host_byte_order;
1457 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1459 void *data_this_buffer;
1461 /* Initialize checksum with ip header. */
1462 ip_header_length = ip4_header_bytes (ip0);
1463 payload_length_host_byte_order =
1464 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1466 clib_host_to_net_u32 (payload_length_host_byte_order +
1467 (ip0->protocol << 16));
1469 if (BITS (uword) == 32)
1472 ip_csum_with_carry (sum0,
1473 clib_mem_unaligned (&ip0->src_address, u32));
1475 ip_csum_with_carry (sum0,
1476 clib_mem_unaligned (&ip0->dst_address, u32));
1480 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1482 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1483 data_this_buffer = (void *) ip0 + ip_header_length;
1484 n_ip_bytes_this_buffer = p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1485 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1487 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1488 n_ip_bytes_this_buffer - ip_header_length : 0;
1492 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1493 n_bytes_left -= n_this_buffer;
1494 if (n_bytes_left == 0)
1497 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1498 p0 = vlib_get_buffer (vm, p0->next_buffer);
1499 data_this_buffer = vlib_buffer_get_current (p0);
1500 n_this_buffer = p0->current_length;
1503 sum16 = ~ip_csum_fold (sum0);
1509 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1511 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1515 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1516 || ip0->protocol == IP_PROTOCOL_UDP);
1518 udp0 = (void *) (ip0 + 1);
1519 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1521 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1522 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1526 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1528 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1529 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1535 VNET_FEATURE_ARC_INIT (ip4_local) =
1537 .arc_name = "ip4-local",
1538 .start_nodes = VNET_FEATURES ("ip4-local"),
1543 ip4_local_validate_l4 (vlib_main_t * vm, vlib_buffer_t * p, ip4_header_t * ip,
1544 u8 is_udp, u8 * error, u8 * good_tcp_udp)
1547 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1548 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1552 u32 ip_len, udp_len;
1554 udp = ip4_next_header (ip);
1555 /* Verify UDP length. */
1556 ip_len = clib_net_to_host_u16 (ip->length);
1557 udp_len = clib_net_to_host_u16 (udp->length);
1559 len_diff = ip_len - udp_len;
1560 *good_tcp_udp &= len_diff >= 0;
1561 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1565 #define ip4_local_do_l4_check(is_tcp_udp, flags) \
1566 (is_tcp_udp && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1569 ip4_local_inline (vlib_main_t * vm,
1570 vlib_node_runtime_t * node,
1571 vlib_frame_t * frame, int head_of_feature_arc)
1573 ip4_main_t *im = &ip4_main;
1574 ip_lookup_main_t *lm = &im->lookup_main;
1575 ip_local_next_t next_index;
1576 u32 *from, *to_next, n_left_from, n_left_to_next;
1577 vlib_node_runtime_t *error_node =
1578 vlib_node_get_runtime (vm, ip4_input_node.index);
1579 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1581 from = vlib_frame_vector_args (frame);
1582 n_left_from = frame->n_vectors;
1583 next_index = node->cached_next_index;
1585 if (node->flags & VLIB_NODE_FLAG_TRACE)
1586 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1588 while (n_left_from > 0)
1590 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1592 while (n_left_from >= 4 && n_left_to_next >= 2)
1594 vlib_buffer_t *p0, *p1;
1595 ip4_header_t *ip0, *ip1;
1596 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1597 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1598 const dpo_id_t *dpo0, *dpo1;
1599 const load_balance_t *lb0, *lb1;
1600 u32 pi0, next0, fib_index0, lbi0;
1601 u32 pi1, next1, fib_index1, lbi1;
1602 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1603 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1604 u32 sw_if_index0, sw_if_index1;
1606 pi0 = to_next[0] = from[0];
1607 pi1 = to_next[1] = from[1];
1611 n_left_to_next -= 2;
1613 next0 = next1 = IP_LOCAL_NEXT_DROP;
1614 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1616 p0 = vlib_get_buffer (vm, pi0);
1617 p1 = vlib_get_buffer (vm, pi1);
1619 ip0 = vlib_buffer_get_current (p0);
1620 ip1 = vlib_buffer_get_current (p1);
1622 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1623 vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1625 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1626 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1628 /* Treat IP frag packets as "experimental" protocol for now
1629 until support of IP frag reassembly is implemented */
1630 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1631 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1633 if (head_of_feature_arc == 0)
1636 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1637 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1638 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1639 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1642 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1644 (p1->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1646 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)
1647 || ip4_local_do_l4_check (is_tcp_udp1,
1651 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1654 ip4_local_validate_l4 (vm, p1, ip1, is_udp1, &error1,
1658 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1659 error0 = (is_tcp_udp0 && !good_tcp_udp0
1660 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1661 error1 = (is_tcp_udp1 && !good_tcp_udp1
1662 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1664 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1666 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1667 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1669 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1671 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1672 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1674 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1675 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1677 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1678 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1679 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1681 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1683 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1685 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1688 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1689 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1690 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1692 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1693 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1694 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1696 lb0 = load_balance_get (lbi0);
1697 lb1 = load_balance_get (lbi1);
1698 dpo0 = load_balance_get_bucket_i (lb0, 0);
1699 dpo1 = load_balance_get_bucket_i (lb1, 0);
1702 * Must have a route to source otherwise we drop the packet.
1703 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1706 * - the source is a recieve => it's from us => bogus, do this
1707 * first since it sets a different error code.
1708 * - uRPF check for any route to source - accept if passes.
1709 * - allow packets destined to the broadcast address from unknown sources
1711 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1712 dpo0->dpoi_type == DPO_RECEIVE) ?
1713 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1714 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1715 !fib_urpf_check_size (lb0->lb_urpf) &&
1716 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1717 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1718 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1719 dpo1->dpoi_type == DPO_RECEIVE) ?
1720 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1721 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1722 !fib_urpf_check_size (lb1->lb_urpf) &&
1723 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1724 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1728 next0 = lm->local_next_by_ip_protocol[proto0];
1729 next1 = lm->local_next_by_ip_protocol[proto1];
1732 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1734 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1736 p0->error = error0 ? error_node->errors[error0] : 0;
1737 p1->error = error1 ? error_node->errors[error1] : 0;
1739 if (head_of_feature_arc)
1741 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1742 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1743 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1744 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1747 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1748 n_left_to_next, pi0, pi1,
1752 while (n_left_from > 0 && n_left_to_next > 0)
1756 ip4_fib_mtrie_t *mtrie0;
1757 ip4_fib_mtrie_leaf_t leaf0;
1758 u32 pi0, next0, fib_index0, lbi0;
1759 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1760 load_balance_t *lb0;
1761 const dpo_id_t *dpo0;
1764 pi0 = to_next[0] = from[0];
1768 n_left_to_next -= 1;
1770 next0 = IP_LOCAL_NEXT_DROP;
1771 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1773 p0 = vlib_get_buffer (vm, pi0);
1774 ip0 = vlib_buffer_get_current (p0);
1775 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1776 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1778 /* Treat IP frag packets as "experimental" protocol for now
1779 until support of IP frag reassembly is implemented */
1780 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1782 if (head_of_feature_arc == 0)
1785 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1786 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1788 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1790 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)))
1792 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1796 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1797 error0 = (is_tcp_udp0 && !good_tcp_udp0
1798 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1800 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1802 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1803 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1804 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1805 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1806 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1808 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1810 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1811 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1812 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1814 lb0 = load_balance_get (lbi0);
1815 dpo0 = load_balance_get_bucket_i (lb0, 0);
1817 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1818 dpo0->dpoi_type == DPO_RECEIVE) ?
1819 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1820 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1821 !fib_urpf_check_size (lb0->lb_urpf) &&
1822 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1823 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1826 next0 = lm->local_next_by_ip_protocol[proto0];
1828 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1830 p0->error = error0 ? error_node->errors[error0] : 0;
1832 if (head_of_feature_arc)
1834 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1835 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1838 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1839 n_left_to_next, pi0, next0);
1841 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1844 return frame->n_vectors;
1848 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1850 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1854 VLIB_REGISTER_NODE (ip4_local_node) =
1856 .function = ip4_local,
1857 .name = "ip4-local",
1858 .vector_size = sizeof (u32),
1859 .format_trace = format_ip4_forward_next_trace,
1860 .n_next_nodes = IP_LOCAL_N_NEXT,
1863 [IP_LOCAL_NEXT_DROP] = "error-drop",
1864 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1865 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1866 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1871 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1874 ip4_local_end_of_arc (vlib_main_t * vm,
1875 vlib_node_runtime_t * node, vlib_frame_t * frame)
1877 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1881 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1882 .function = ip4_local_end_of_arc,
1883 .name = "ip4-local-end-of-arc",
1884 .vector_size = sizeof (u32),
1886 .format_trace = format_ip4_forward_next_trace,
1887 .sibling_of = "ip4-local",
1890 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1892 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1893 .arc_name = "ip4-local",
1894 .node_name = "ip4-local-end-of-arc",
1895 .runs_before = 0, /* not before any other features */
1900 ip4_register_protocol (u32 protocol, u32 node_index)
1902 vlib_main_t *vm = vlib_get_main ();
1903 ip4_main_t *im = &ip4_main;
1904 ip_lookup_main_t *lm = &im->lookup_main;
1906 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1907 lm->local_next_by_ip_protocol[protocol] =
1908 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1911 static clib_error_t *
1912 show_ip_local_command_fn (vlib_main_t * vm,
1913 unformat_input_t * input, vlib_cli_command_t * cmd)
1915 ip4_main_t *im = &ip4_main;
1916 ip_lookup_main_t *lm = &im->lookup_main;
1919 vlib_cli_output (vm, "Protocols handled by ip4_local");
1920 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1922 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1923 vlib_cli_output (vm, "%d", i);
1931 * Display the set of protocols handled by the local IPv4 stack.
1934 * Example of how to display local protocol table:
1935 * @cliexstart{show ip local}
1936 * Protocols handled by ip4_local
1943 VLIB_CLI_COMMAND (show_ip_local, static) =
1945 .path = "show ip local",
1946 .function = show_ip_local_command_fn,
1947 .short_help = "show ip local",
1952 ip4_arp_inline (vlib_main_t * vm,
1953 vlib_node_runtime_t * node,
1954 vlib_frame_t * frame, int is_glean)
1956 vnet_main_t *vnm = vnet_get_main ();
1957 ip4_main_t *im = &ip4_main;
1958 ip_lookup_main_t *lm = &im->lookup_main;
1959 u32 *from, *to_next_drop;
1960 uword n_left_from, n_left_to_next_drop, next_index;
1961 static f64 time_last_seed_change = -1e100;
1962 static u32 hash_seeds[3];
1963 static uword hash_bitmap[256 / BITS (uword)];
1966 if (node->flags & VLIB_NODE_FLAG_TRACE)
1967 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1969 time_now = vlib_time_now (vm);
1970 if (time_now - time_last_seed_change > 1e-3)
1973 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
1974 sizeof (hash_seeds));
1975 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1976 hash_seeds[i] = r[i];
1978 /* Mark all hash keys as been no-seen before. */
1979 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1982 time_last_seed_change = time_now;
1985 from = vlib_frame_vector_args (frame);
1986 n_left_from = frame->n_vectors;
1987 next_index = node->cached_next_index;
1988 if (next_index == IP4_ARP_NEXT_DROP)
1989 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1991 while (n_left_from > 0)
1993 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1994 to_next_drop, n_left_to_next_drop);
1996 while (n_left_from > 0 && n_left_to_next_drop > 0)
1998 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1999 ip_adjacency_t *adj0;
2006 p0 = vlib_get_buffer (vm, pi0);
2008 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2009 adj0 = adj_get (adj_index0);
2010 ip0 = vlib_buffer_get_current (p0);
2016 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2017 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2022 * this is the Glean case, so we are ARPing for the
2023 * packet's destination
2025 a0 ^= ip0->dst_address.data_u32;
2029 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2033 hash_v3_finalize32 (a0, b0, c0);
2035 c0 &= BITS (hash_bitmap) - 1;
2036 c0 = c0 / BITS (uword);
2037 m0 = (uword) 1 << (c0 % BITS (uword));
2039 bm0 = hash_bitmap[c0];
2040 drop0 = (bm0 & m0) != 0;
2042 /* Mark it as seen. */
2043 hash_bitmap[c0] = bm0 | m0;
2047 to_next_drop[0] = pi0;
2049 n_left_to_next_drop -= 1;
2052 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2053 IP4_ARP_ERROR_REQUEST_SENT];
2056 * the adj has been updated to a rewrite but the node the DPO that got
2057 * us here hasn't - yet. no big deal. we'll drop while we wait.
2059 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2066 * Can happen if the control-plane is programming tables
2067 * with traffic flowing; at least that's today's lame excuse.
2069 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2070 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2072 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2075 /* Send ARP request. */
2079 ethernet_arp_header_t *h0;
2080 vnet_hw_interface_t *hw_if0;
2083 vlib_packet_template_get_packet (vm,
2084 &im->ip4_arp_request_packet_template,
2087 /* Add rewrite/encap string for ARP packet. */
2088 vnet_rewrite_one_header (adj0[0], h0,
2089 sizeof (ethernet_header_t));
2091 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2093 /* Src ethernet address in ARP header. */
2094 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2096 sizeof (h0->ip4_over_ethernet[0].ethernet));
2100 /* The interface's source address is stashed in the Glean Adj */
2101 h0->ip4_over_ethernet[0].ip4 =
2102 adj0->sub_type.glean.receive_addr.ip4;
2104 /* Copy in destination address we are requesting. This is the
2105 * glean case, so it's the packet's destination.*/
2106 h0->ip4_over_ethernet[1].ip4.data_u32 =
2107 ip0->dst_address.data_u32;
2111 /* Src IP address in ARP header. */
2112 if (ip4_src_address_for_packet (lm, sw_if_index0,
2114 ip4_over_ethernet[0].ip4))
2116 /* No source address available */
2118 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2119 vlib_buffer_free (vm, &bi0, 1);
2123 /* Copy in destination address we are requesting from the
2125 h0->ip4_over_ethernet[1].ip4.data_u32 =
2126 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2129 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2130 b0 = vlib_get_buffer (vm, bi0);
2131 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2133 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2135 vlib_set_next_frame_buffer (vm, node,
2136 adj0->rewrite_header.next_index,
2141 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2144 return frame->n_vectors;
2148 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2150 return (ip4_arp_inline (vm, node, frame, 0));
2154 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2156 return (ip4_arp_inline (vm, node, frame, 1));
2159 static char *ip4_arp_error_strings[] = {
2160 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2161 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2162 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2163 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2164 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2165 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2168 VLIB_REGISTER_NODE (ip4_arp_node) =
2170 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2171 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2172 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2173 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2175 [IP4_ARP_NEXT_DROP] = "error-drop",}
2178 VLIB_REGISTER_NODE (ip4_glean_node) =
2180 .function = ip4_glean,.name = "ip4-glean",.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 #define foreach_notrace_ip4_arp_error \
2195 arp_notrace_init (vlib_main_t * vm)
2197 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2199 /* don't trace ARP request packets */
2201 vnet_pcap_drop_trace_filter_add_del \
2202 (rt->errors[IP4_ARP_ERROR_##a], \
2204 foreach_notrace_ip4_arp_error;
2209 VLIB_INIT_FUNCTION (arp_notrace_init);
2212 /* Send an ARP request to see if given destination is reachable on given interface. */
2214 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2216 vnet_main_t *vnm = vnet_get_main ();
2217 ip4_main_t *im = &ip4_main;
2218 ethernet_arp_header_t *h;
2220 ip_interface_address_t *ia;
2221 ip_adjacency_t *adj;
2222 vnet_hw_interface_t *hi;
2223 vnet_sw_interface_t *si;
2228 si = vnet_get_sw_interface (vnm, sw_if_index);
2230 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2232 return clib_error_return (0, "%U: interface %U down",
2233 format_ip4_address, dst,
2234 format_vnet_sw_if_index_name, vnm,
2239 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2242 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2243 return clib_error_return
2245 "no matching interface address for destination %U (interface %U)",
2246 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2250 ip46_address_t nh = {
2254 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2255 VNET_LINK_IP4, &nh, sw_if_index);
2258 h = vlib_packet_template_get_packet (vm,
2259 &im->ip4_arp_request_packet_template,
2262 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2263 if (PREDICT_FALSE (!hi->hw_address))
2265 return clib_error_return (0, "%U: interface %U do not support ip probe",
2266 format_ip4_address, dst,
2267 format_vnet_sw_if_index_name, vnm,
2271 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2272 sizeof (h->ip4_over_ethernet[0].ethernet));
2274 h->ip4_over_ethernet[0].ip4 = src[0];
2275 h->ip4_over_ethernet[1].ip4 = dst[0];
2277 b = vlib_get_buffer (vm, bi);
2278 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2279 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2281 /* Add encapsulation string for software interface (e.g. ethernet header). */
2282 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2283 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2286 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2287 u32 *to_next = vlib_frame_vector_args (f);
2290 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2294 return /* no error */ 0;
2299 IP4_REWRITE_NEXT_DROP,
2300 IP4_REWRITE_NEXT_ICMP_ERROR,
2301 } ip4_rewrite_next_t;
2304 ip4_rewrite_inline (vlib_main_t * vm,
2305 vlib_node_runtime_t * node,
2306 vlib_frame_t * frame,
2307 int do_counters, int is_midchain, int is_mcast)
2309 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2310 u32 *from = vlib_frame_vector_args (frame);
2311 u32 n_left_from, n_left_to_next, *to_next, next_index;
2312 vlib_node_runtime_t *error_node =
2313 vlib_node_get_runtime (vm, ip4_input_node.index);
2315 n_left_from = frame->n_vectors;
2316 next_index = node->cached_next_index;
2317 u32 thread_index = vlib_get_thread_index ();
2319 while (n_left_from > 0)
2321 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2323 while (n_left_from >= 4 && n_left_to_next >= 2)
2325 ip_adjacency_t *adj0, *adj1;
2326 vlib_buffer_t *p0, *p1;
2327 ip4_header_t *ip0, *ip1;
2328 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2329 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2330 u32 tx_sw_if_index0, tx_sw_if_index1;
2332 /* Prefetch next iteration. */
2334 vlib_buffer_t *p2, *p3;
2336 p2 = vlib_get_buffer (vm, from[2]);
2337 p3 = vlib_get_buffer (vm, from[3]);
2339 vlib_prefetch_buffer_header (p2, STORE);
2340 vlib_prefetch_buffer_header (p3, STORE);
2342 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2343 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2346 pi0 = to_next[0] = from[0];
2347 pi1 = to_next[1] = from[1];
2352 n_left_to_next -= 2;
2354 p0 = vlib_get_buffer (vm, pi0);
2355 p1 = vlib_get_buffer (vm, pi1);
2357 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2358 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2361 * pre-fetch the per-adjacency counters
2365 vlib_prefetch_combined_counter (&adjacency_counters,
2366 thread_index, adj_index0);
2367 vlib_prefetch_combined_counter (&adjacency_counters,
2368 thread_index, adj_index1);
2371 ip0 = vlib_buffer_get_current (p0);
2372 ip1 = vlib_buffer_get_current (p1);
2374 error0 = error1 = IP4_ERROR_NONE;
2375 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2377 /* Decrement TTL & update checksum.
2378 Works either endian, so no need for byte swap. */
2379 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2381 i32 ttl0 = ip0->ttl;
2383 /* Input node should have reject packets with ttl 0. */
2384 ASSERT (ip0->ttl > 0);
2386 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2387 checksum0 += checksum0 >= 0xffff;
2389 ip0->checksum = checksum0;
2394 * If the ttl drops below 1 when forwarding, generate
2397 if (PREDICT_FALSE (ttl0 <= 0))
2399 error0 = IP4_ERROR_TIME_EXPIRED;
2400 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2401 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2402 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2404 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2407 /* Verify checksum. */
2408 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2409 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2413 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2415 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2417 i32 ttl1 = ip1->ttl;
2419 /* Input node should have reject packets with ttl 0. */
2420 ASSERT (ip1->ttl > 0);
2422 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2423 checksum1 += checksum1 >= 0xffff;
2425 ip1->checksum = checksum1;
2430 * If the ttl drops below 1 when forwarding, generate
2433 if (PREDICT_FALSE (ttl1 <= 0))
2435 error1 = IP4_ERROR_TIME_EXPIRED;
2436 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2437 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2438 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2440 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2443 /* Verify checksum. */
2444 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2445 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2449 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2452 /* Rewrite packet header and updates lengths. */
2453 adj0 = adj_get (adj_index0);
2454 adj1 = adj_get (adj_index1);
2456 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2457 rw_len0 = adj0[0].rewrite_header.data_bytes;
2458 rw_len1 = adj1[0].rewrite_header.data_bytes;
2459 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2460 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2462 /* Check MTU of outgoing interface. */
2464 (vlib_buffer_length_in_chain (vm, p0) >
2466 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2469 (vlib_buffer_length_in_chain (vm, p1) >
2471 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2474 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2475 * to see the IP headerr */
2476 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2478 next0 = adj0[0].rewrite_header.next_index;
2479 p0->current_data -= rw_len0;
2480 p0->current_length += rw_len0;
2481 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2482 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2485 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2486 vnet_feature_arc_start (lm->output_feature_arc_index,
2487 tx_sw_if_index0, &next0, p0);
2489 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2491 next1 = adj1[0].rewrite_header.next_index;
2492 p1->current_data -= rw_len1;
2493 p1->current_length += rw_len1;
2495 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2496 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2499 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2500 vnet_feature_arc_start (lm->output_feature_arc_index,
2501 tx_sw_if_index1, &next1, p1);
2504 /* Guess we are only writing on simple Ethernet header. */
2505 vnet_rewrite_two_headers (adj0[0], adj1[0],
2506 ip0, ip1, sizeof (ethernet_header_t));
2509 * Bump the per-adjacency counters
2513 vlib_increment_combined_counter
2514 (&adjacency_counters,
2517 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2519 vlib_increment_combined_counter
2520 (&adjacency_counters,
2523 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2528 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2529 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2534 * copy bytes from the IP address into the MAC rewrite
2536 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2537 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2540 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2541 to_next, n_left_to_next,
2542 pi0, pi1, next0, next1);
2545 while (n_left_from > 0 && n_left_to_next > 0)
2547 ip_adjacency_t *adj0;
2550 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2551 u32 tx_sw_if_index0;
2553 pi0 = to_next[0] = from[0];
2555 p0 = vlib_get_buffer (vm, pi0);
2557 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2559 adj0 = adj_get (adj_index0);
2561 ip0 = vlib_buffer_get_current (p0);
2563 error0 = IP4_ERROR_NONE;
2564 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2566 /* Decrement TTL & update checksum. */
2567 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2569 i32 ttl0 = ip0->ttl;
2571 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2573 checksum0 += checksum0 >= 0xffff;
2575 ip0->checksum = checksum0;
2577 ASSERT (ip0->ttl > 0);
2583 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2584 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2586 if (PREDICT_FALSE (ttl0 <= 0))
2589 * If the ttl drops below 1 when forwarding, generate
2592 error0 = IP4_ERROR_TIME_EXPIRED;
2593 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2594 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2595 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2596 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2602 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2606 vlib_prefetch_combined_counter (&adjacency_counters,
2607 thread_index, adj_index0);
2609 /* Guess we are only writing on simple Ethernet header. */
2610 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2614 * copy bytes from the IP address into the MAC rewrite
2616 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2619 /* Update packet buffer attributes/set output interface. */
2620 rw_len0 = adj0[0].rewrite_header.data_bytes;
2621 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2624 vlib_increment_combined_counter
2625 (&adjacency_counters,
2626 thread_index, adj_index0, 1,
2627 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2629 /* Check MTU of outgoing interface. */
2630 error0 = (vlib_buffer_length_in_chain (vm, p0)
2631 > adj0[0].rewrite_header.max_l3_packet_bytes
2632 ? IP4_ERROR_MTU_EXCEEDED : error0);
2634 p0->error = error_node->errors[error0];
2636 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2637 * to see the IP headerr */
2638 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2640 p0->current_data -= rw_len0;
2641 p0->current_length += rw_len0;
2642 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2644 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2645 next0 = adj0[0].rewrite_header.next_index;
2649 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2653 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2654 vnet_feature_arc_start (lm->output_feature_arc_index,
2655 tx_sw_if_index0, &next0, p0);
2662 n_left_to_next -= 1;
2664 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2665 to_next, n_left_to_next,
2669 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2672 /* Need to do trace after rewrites to pick up new packet data. */
2673 if (node->flags & VLIB_NODE_FLAG_TRACE)
2674 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2676 return frame->n_vectors;
2680 /** @brief IPv4 rewrite node.
2683 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2684 header checksum, fetch the ip adjacency, check the outbound mtu,
2685 apply the adjacency rewrite, and send pkts to the adjacency
2686 rewrite header's rewrite_next_index.
2688 @param vm vlib_main_t corresponding to the current thread
2689 @param node vlib_node_runtime_t
2690 @param frame vlib_frame_t whose contents should be dispatched
2692 @par Graph mechanics: buffer metadata, next index usage
2695 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2696 - the rewrite adjacency index
2697 - <code>adj->lookup_next_index</code>
2698 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2699 the packet will be dropped.
2700 - <code>adj->rewrite_header</code>
2701 - Rewrite string length, rewrite string, next_index
2704 - <code>b->current_data, b->current_length</code>
2705 - Updated net of applying the rewrite string
2707 <em>Next Indices:</em>
2708 - <code> adj->rewrite_header.next_index </code>
2712 ip4_rewrite (vlib_main_t * vm,
2713 vlib_node_runtime_t * node, vlib_frame_t * frame)
2715 if (adj_are_counters_enabled ())
2716 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2718 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2722 ip4_midchain (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, 1, 0);
2728 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2732 ip4_rewrite_mcast (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, 0, 1);
2738 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2742 ip4_mcast_midchain (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, 1, 1);
2748 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2752 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2753 .function = ip4_rewrite,
2754 .name = "ip4-rewrite",
2755 .vector_size = sizeof (u32),
2757 .format_trace = format_ip4_rewrite_trace,
2761 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2762 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2765 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2767 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2768 .function = ip4_rewrite_mcast,
2769 .name = "ip4-rewrite-mcast",
2770 .vector_size = sizeof (u32),
2772 .format_trace = format_ip4_rewrite_trace,
2773 .sibling_of = "ip4-rewrite",
2775 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2777 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2778 .function = ip4_mcast_midchain,
2779 .name = "ip4-mcast-midchain",
2780 .vector_size = sizeof (u32),
2782 .format_trace = format_ip4_rewrite_trace,
2783 .sibling_of = "ip4-rewrite",
2785 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2787 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2788 .function = ip4_midchain,
2789 .name = "ip4-midchain",
2790 .vector_size = sizeof (u32),
2791 .format_trace = format_ip4_forward_next_trace,
2792 .sibling_of = "ip4-rewrite",
2794 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2797 static clib_error_t *
2798 add_del_interface_table (vlib_main_t * vm,
2799 unformat_input_t * input, vlib_cli_command_t * cmd)
2801 vnet_main_t *vnm = vnet_get_main ();
2802 ip_interface_address_t *ia;
2803 clib_error_t *error = 0;
2804 u32 sw_if_index, table_id;
2808 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2810 error = clib_error_return (0, "unknown interface `%U'",
2811 format_unformat_error, input);
2815 if (unformat (input, "%d", &table_id))
2819 error = clib_error_return (0, "expected table id `%U'",
2820 format_unformat_error, input);
2825 * If the interface already has in IP address, then a change int
2826 * VRF is not allowed. The IP address applied must first be removed.
2827 * We do not do that automatically here, since VPP has no knowledge
2828 * of whether thoses subnets are valid in the destination VRF.
2831 foreach_ip_interface_address (&ip4_main.lookup_main,
2833 1 /* honor unnumbered */,
2837 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2838 error = clib_error_return (0, "interface %U has address %U",
2839 format_vnet_sw_if_index_name, vnm,
2841 format_ip4_address, a);
2847 ip4_main_t *im = &ip4_main;
2850 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2852 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2853 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2855 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2856 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2857 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2865 * Place the indicated interface into the supplied IPv4 FIB table (also known
2866 * as a VRF). If the FIB table does not exist, this command creates it. To
2867 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2868 * FIB table will only be displayed if a route has been added to the table, or
2869 * an IP Address is assigned to an interface in the table (which adds a route
2872 * @note IP addresses added after setting the interface IP table are added to
2873 * the indicated FIB table. If an IP address is added prior to changing the
2874 * table then this is an error. The control plane must remove these addresses
2875 * first and then change the table. VPP will not automatically move the
2876 * addresses from the old to the new table as it does not know the validity
2880 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2881 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2884 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2886 .path = "set interface ip table",
2887 .function = add_del_interface_table,
2888 .short_help = "set interface ip table <interface> <table-id>",
2893 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2895 ip4_fib_mtrie_t *mtrie0;
2896 ip4_fib_mtrie_leaf_t leaf0;
2899 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2901 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2902 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2903 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2905 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2907 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2910 static clib_error_t *
2911 test_lookup_command_fn (vlib_main_t * vm,
2912 unformat_input_t * input, vlib_cli_command_t * cmd)
2919 ip4_address_t ip4_base_address;
2922 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2924 if (unformat (input, "table %d", &table_id))
2926 /* Make sure the entry exists. */
2927 fib = ip4_fib_get (table_id);
2928 if ((fib) && (fib->index != table_id))
2929 return clib_error_return (0, "<fib-index> %d does not exist",
2932 else if (unformat (input, "count %f", &count))
2935 else if (unformat (input, "%U",
2936 unformat_ip4_address, &ip4_base_address))
2939 return clib_error_return (0, "unknown input `%U'",
2940 format_unformat_error, input);
2945 for (i = 0; i < n; i++)
2947 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2950 ip4_base_address.as_u32 =
2951 clib_host_to_net_u32 (1 +
2952 clib_net_to_host_u32 (ip4_base_address.as_u32));
2956 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2958 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2964 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2965 * given FIB table to determine if there is a conflict with the
2966 * adjacency table. The fib-id can be determined by using the
2967 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2970 * @todo This command uses fib-id, other commands use table-id (not
2971 * just a name, they are different indexes). Would like to change this
2972 * to table-id for consistency.
2975 * Example of how to run the test lookup command:
2976 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2977 * No errors in 2 lookups
2981 VLIB_CLI_COMMAND (lookup_test_command, static) =
2983 .path = "test lookup",
2984 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2985 .function = test_lookup_command_fn,
2990 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2994 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2996 if (~0 == fib_index)
2997 return VNET_API_ERROR_NO_SUCH_FIB;
2999 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
3005 static clib_error_t *
3006 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3007 unformat_input_t * input,
3008 vlib_cli_command_t * cmd)
3012 u32 flow_hash_config = 0;
3015 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3017 if (unformat (input, "table %d", &table_id))
3020 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3021 foreach_flow_hash_bit
3028 return clib_error_return (0, "unknown input `%U'",
3029 format_unformat_error, input);
3031 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3037 case VNET_API_ERROR_NO_SUCH_FIB:
3038 return clib_error_return (0, "no such FIB table %d", table_id);
3041 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3049 * Configure the set of IPv4 fields used by the flow hash.
3052 * Example of how to set the flow hash on a given table:
3053 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3054 * Example of display the configured flow hash:
3055 * @cliexstart{show ip fib}
3056 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3059 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3060 * [0] [@0]: dpo-drop ip6
3063 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3064 * [0] [@0]: dpo-drop ip6
3067 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3068 * [0] [@0]: dpo-drop ip6
3071 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3072 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3075 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3076 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3077 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3078 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3079 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3082 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3083 * [0] [@0]: dpo-drop ip6
3084 * 255.255.255.255/32
3086 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3087 * [0] [@0]: dpo-drop ip6
3088 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3091 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3092 * [0] [@0]: dpo-drop ip6
3095 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3096 * [0] [@0]: dpo-drop ip6
3099 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3100 * [0] [@4]: ipv4-glean: af_packet0
3103 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3104 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3107 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3108 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3111 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3112 * [0] [@4]: ipv4-glean: af_packet1
3115 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3116 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3119 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3120 * [0] [@0]: dpo-drop ip6
3123 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3124 * [0] [@0]: dpo-drop ip6
3125 * 255.255.255.255/32
3127 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3128 * [0] [@0]: dpo-drop ip6
3132 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3134 .path = "set ip flow-hash",
3136 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3137 .function = set_ip_flow_hash_command_fn,
3142 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3145 vnet_main_t *vnm = vnet_get_main ();
3146 vnet_interface_main_t *im = &vnm->interface_main;
3147 ip4_main_t *ipm = &ip4_main;
3148 ip_lookup_main_t *lm = &ipm->lookup_main;
3149 vnet_classify_main_t *cm = &vnet_classify_main;
3150 ip4_address_t *if_addr;
3152 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3153 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3155 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3156 return VNET_API_ERROR_NO_SUCH_ENTRY;
3158 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3159 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3161 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3163 if (NULL != if_addr)
3165 fib_prefix_t pfx = {
3167 .fp_proto = FIB_PROTOCOL_IP4,
3168 .fp_addr.ip4 = *if_addr,
3172 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3176 if (table_index != (u32) ~ 0)
3178 dpo_id_t dpo = DPO_INVALID;
3183 classify_dpo_create (DPO_PROTO_IP4, table_index));
3185 fib_table_entry_special_dpo_add (fib_index,
3187 FIB_SOURCE_CLASSIFY,
3188 FIB_ENTRY_FLAG_NONE, &dpo);
3193 fib_table_entry_special_remove (fib_index,
3194 &pfx, FIB_SOURCE_CLASSIFY);
3201 static clib_error_t *
3202 set_ip_classify_command_fn (vlib_main_t * vm,
3203 unformat_input_t * input,
3204 vlib_cli_command_t * cmd)
3206 u32 table_index = ~0;
3207 int table_index_set = 0;
3208 u32 sw_if_index = ~0;
3211 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3213 if (unformat (input, "table-index %d", &table_index))
3214 table_index_set = 1;
3215 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3216 vnet_get_main (), &sw_if_index))
3222 if (table_index_set == 0)
3223 return clib_error_return (0, "classify table-index must be specified");
3225 if (sw_if_index == ~0)
3226 return clib_error_return (0, "interface / subif must be specified");
3228 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3235 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3236 return clib_error_return (0, "No such interface");
3238 case VNET_API_ERROR_NO_SUCH_ENTRY:
3239 return clib_error_return (0, "No such classifier table");
3245 * Assign a classification table to an interface. The classification
3246 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3247 * commands. Once the table is create, use this command to filter packets
3251 * Example of how to assign a classification table to an interface:
3252 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3255 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3257 .path = "set ip classify",
3259 "set ip classify intfc <interface> table-index <classify-idx>",
3260 .function = set_ip_classify_command_fn,
3265 * fd.io coding-style-patch-verification: ON
3268 * eval: (c-set-style "gnu")