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_lookup_inline (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
67 int lookup_for_responses_to_locally_received_packets)
69 ip4_main_t *im = &ip4_main;
70 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
71 u32 n_left_from, n_left_to_next, *from, *to_next;
72 ip_lookup_next_t next;
73 u32 thread_index = vlib_get_thread_index ();
75 from = vlib_frame_vector_args (frame);
76 n_left_from = frame->n_vectors;
77 next = node->cached_next_index;
79 while (n_left_from > 0)
81 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
83 while (n_left_from >= 8 && n_left_to_next >= 4)
85 vlib_buffer_t *p0, *p1, *p2, *p3;
86 ip4_header_t *ip0, *ip1, *ip2, *ip3;
87 ip_lookup_next_t next0, next1, next2, next3;
88 const load_balance_t *lb0, *lb1, *lb2, *lb3;
89 ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
90 ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
91 ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
92 u32 pi0, fib_index0, lb_index0;
93 u32 pi1, fib_index1, lb_index1;
94 u32 pi2, fib_index2, lb_index2;
95 u32 pi3, fib_index3, lb_index3;
96 flow_hash_config_t flow_hash_config0, flow_hash_config1;
97 flow_hash_config_t flow_hash_config2, flow_hash_config3;
98 u32 hash_c0, hash_c1, hash_c2, hash_c3;
99 const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
101 /* Prefetch next iteration. */
103 vlib_buffer_t *p4, *p5, *p6, *p7;
105 p4 = vlib_get_buffer (vm, from[4]);
106 p5 = vlib_get_buffer (vm, from[5]);
107 p6 = vlib_get_buffer (vm, from[6]);
108 p7 = vlib_get_buffer (vm, from[7]);
110 vlib_prefetch_buffer_header (p4, LOAD);
111 vlib_prefetch_buffer_header (p5, LOAD);
112 vlib_prefetch_buffer_header (p6, LOAD);
113 vlib_prefetch_buffer_header (p7, LOAD);
115 CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
116 CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
117 CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
118 CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
121 pi0 = to_next[0] = from[0];
122 pi1 = to_next[1] = from[1];
123 pi2 = to_next[2] = from[2];
124 pi3 = to_next[3] = from[3];
131 p0 = vlib_get_buffer (vm, pi0);
132 p1 = vlib_get_buffer (vm, pi1);
133 p2 = vlib_get_buffer (vm, pi2);
134 p3 = vlib_get_buffer (vm, pi3);
136 ip0 = vlib_buffer_get_current (p0);
137 ip1 = vlib_buffer_get_current (p1);
138 ip2 = vlib_buffer_get_current (p2);
139 ip3 = vlib_buffer_get_current (p3);
141 dst_addr0 = &ip0->dst_address;
142 dst_addr1 = &ip1->dst_address;
143 dst_addr2 = &ip2->dst_address;
144 dst_addr3 = &ip3->dst_address;
147 vec_elt (im->fib_index_by_sw_if_index,
148 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
150 vec_elt (im->fib_index_by_sw_if_index,
151 vnet_buffer (p1)->sw_if_index[VLIB_RX]);
153 vec_elt (im->fib_index_by_sw_if_index,
154 vnet_buffer (p2)->sw_if_index[VLIB_RX]);
156 vec_elt (im->fib_index_by_sw_if_index,
157 vnet_buffer (p3)->sw_if_index[VLIB_RX]);
159 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
160 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
162 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
163 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
165 (vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
166 (u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
168 (vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
169 (u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
172 if (!lookup_for_responses_to_locally_received_packets)
174 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
175 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
176 mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
177 mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
179 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
180 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
181 leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
182 leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
185 if (!lookup_for_responses_to_locally_received_packets)
187 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
188 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
189 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
190 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
193 if (!lookup_for_responses_to_locally_received_packets)
195 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
196 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
197 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
198 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
201 if (lookup_for_responses_to_locally_received_packets)
203 lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
204 lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
205 lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
206 lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
210 lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
211 lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
212 lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
213 lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
216 ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
217 lb0 = load_balance_get (lb_index0);
218 lb1 = load_balance_get (lb_index1);
219 lb2 = load_balance_get (lb_index2);
220 lb3 = load_balance_get (lb_index3);
222 ASSERT (lb0->lb_n_buckets > 0);
223 ASSERT (is_pow2 (lb0->lb_n_buckets));
224 ASSERT (lb1->lb_n_buckets > 0);
225 ASSERT (is_pow2 (lb1->lb_n_buckets));
226 ASSERT (lb2->lb_n_buckets > 0);
227 ASSERT (is_pow2 (lb2->lb_n_buckets));
228 ASSERT (lb3->lb_n_buckets > 0);
229 ASSERT (is_pow2 (lb3->lb_n_buckets));
231 /* Use flow hash to compute multipath adjacency. */
232 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
233 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
234 hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
235 hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
236 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
238 flow_hash_config0 = lb0->lb_hash_config;
239 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
240 ip4_compute_flow_hash (ip0, flow_hash_config0);
242 load_balance_get_fwd_bucket (lb0,
244 (lb0->lb_n_buckets_minus_1)));
248 dpo0 = load_balance_get_bucket_i (lb0, 0);
250 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
252 flow_hash_config1 = lb1->lb_hash_config;
253 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
254 ip4_compute_flow_hash (ip1, flow_hash_config1);
256 load_balance_get_fwd_bucket (lb1,
258 (lb1->lb_n_buckets_minus_1)));
262 dpo1 = load_balance_get_bucket_i (lb1, 0);
264 if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
266 flow_hash_config2 = lb2->lb_hash_config;
267 hash_c2 = vnet_buffer (p2)->ip.flow_hash =
268 ip4_compute_flow_hash (ip2, flow_hash_config2);
270 load_balance_get_fwd_bucket (lb2,
272 (lb2->lb_n_buckets_minus_1)));
276 dpo2 = load_balance_get_bucket_i (lb2, 0);
278 if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
280 flow_hash_config3 = lb3->lb_hash_config;
281 hash_c3 = vnet_buffer (p3)->ip.flow_hash =
282 ip4_compute_flow_hash (ip3, flow_hash_config3);
284 load_balance_get_fwd_bucket (lb3,
286 (lb3->lb_n_buckets_minus_1)));
290 dpo3 = load_balance_get_bucket_i (lb3, 0);
293 next0 = dpo0->dpoi_next_node;
294 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
295 next1 = dpo1->dpoi_next_node;
296 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
297 next2 = dpo2->dpoi_next_node;
298 vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
299 next3 = dpo3->dpoi_next_node;
300 vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
302 vlib_increment_combined_counter
303 (cm, thread_index, lb_index0, 1,
304 vlib_buffer_length_in_chain (vm, p0));
305 vlib_increment_combined_counter
306 (cm, thread_index, lb_index1, 1,
307 vlib_buffer_length_in_chain (vm, p1));
308 vlib_increment_combined_counter
309 (cm, thread_index, lb_index2, 1,
310 vlib_buffer_length_in_chain (vm, p2));
311 vlib_increment_combined_counter
312 (cm, thread_index, lb_index3, 1,
313 vlib_buffer_length_in_chain (vm, p3));
315 vlib_validate_buffer_enqueue_x4 (vm, node, next,
316 to_next, n_left_to_next,
318 next0, next1, next2, next3);
321 while (n_left_from > 0 && n_left_to_next > 0)
325 ip_lookup_next_t next0;
326 const load_balance_t *lb0;
327 ip4_fib_mtrie_t *mtrie0;
328 ip4_fib_mtrie_leaf_t leaf0;
329 ip4_address_t *dst_addr0;
330 u32 pi0, fib_index0, lbi0;
331 flow_hash_config_t flow_hash_config0;
332 const dpo_id_t *dpo0;
338 p0 = vlib_get_buffer (vm, pi0);
340 ip0 = vlib_buffer_get_current (p0);
342 dst_addr0 = &ip0->dst_address;
345 vec_elt (im->fib_index_by_sw_if_index,
346 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
348 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
349 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
351 if (!lookup_for_responses_to_locally_received_packets)
353 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
355 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
358 if (!lookup_for_responses_to_locally_received_packets)
359 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
361 if (!lookup_for_responses_to_locally_received_packets)
362 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
364 if (lookup_for_responses_to_locally_received_packets)
365 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
368 /* Handle default route. */
369 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
373 lb0 = load_balance_get (lbi0);
375 ASSERT (lb0->lb_n_buckets > 0);
376 ASSERT (is_pow2 (lb0->lb_n_buckets));
378 /* Use flow hash to compute multipath adjacency. */
379 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
380 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
382 flow_hash_config0 = lb0->lb_hash_config;
384 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
385 ip4_compute_flow_hash (ip0, flow_hash_config0);
387 load_balance_get_fwd_bucket (lb0,
389 (lb0->lb_n_buckets_minus_1)));
393 dpo0 = load_balance_get_bucket_i (lb0, 0);
396 next0 = dpo0->dpoi_next_node;
397 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
399 vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
400 vlib_buffer_length_in_chain (vm,
408 if (PREDICT_FALSE (next0 != next))
411 vlib_put_next_frame (vm, node, next, n_left_to_next);
413 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
420 vlib_put_next_frame (vm, node, next, n_left_to_next);
423 if (node->flags & VLIB_NODE_FLAG_TRACE)
424 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
426 return frame->n_vectors;
429 /** @brief IPv4 lookup node.
432 This is the main IPv4 lookup dispatch node.
434 @param vm vlib_main_t corresponding to the current thread
435 @param node vlib_node_runtime_t
436 @param frame vlib_frame_t whose contents should be dispatched
438 @par Graph mechanics: buffer metadata, next index usage
441 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
442 - Indicates the @c sw_if_index value of the interface that the
443 packet was received on.
444 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
445 - When the value is @c ~0 then the node performs a longest prefix
446 match (LPM) for the packet destination address in the FIB attached
447 to the receive interface.
448 - Otherwise perform LPM for the packet destination address in the
449 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
450 value (0, 1, ...) and not a VRF id.
453 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
454 - The lookup result adjacency index.
457 - Dispatches the packet to the node index found in
458 ip_adjacency_t @c adj->lookup_next_index
459 (where @c adj is the lookup result adjacency).
462 ip4_lookup (vlib_main_t * vm,
463 vlib_node_runtime_t * node, vlib_frame_t * frame)
465 return ip4_lookup_inline (vm, node, frame,
466 /* lookup_for_responses_to_locally_received_packets */
471 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
473 VLIB_REGISTER_NODE (ip4_lookup_node) =
475 .function = ip4_lookup,.name = "ip4-lookup",.vector_size =
476 sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
477 IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
479 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
482 ip4_load_balance (vlib_main_t * vm,
483 vlib_node_runtime_t * node, vlib_frame_t * frame)
485 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
486 u32 n_left_from, n_left_to_next, *from, *to_next;
487 ip_lookup_next_t next;
488 u32 thread_index = vlib_get_thread_index ();
490 from = vlib_frame_vector_args (frame);
491 n_left_from = frame->n_vectors;
492 next = node->cached_next_index;
494 if (node->flags & VLIB_NODE_FLAG_TRACE)
495 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
497 while (n_left_from > 0)
499 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
502 while (n_left_from >= 4 && n_left_to_next >= 2)
504 ip_lookup_next_t next0, next1;
505 const load_balance_t *lb0, *lb1;
506 vlib_buffer_t *p0, *p1;
507 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
508 const ip4_header_t *ip0, *ip1;
509 const dpo_id_t *dpo0, *dpo1;
511 /* Prefetch next iteration. */
513 vlib_buffer_t *p2, *p3;
515 p2 = vlib_get_buffer (vm, from[2]);
516 p3 = vlib_get_buffer (vm, from[3]);
518 vlib_prefetch_buffer_header (p2, STORE);
519 vlib_prefetch_buffer_header (p3, STORE);
521 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
522 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
525 pi0 = to_next[0] = from[0];
526 pi1 = to_next[1] = from[1];
533 p0 = vlib_get_buffer (vm, pi0);
534 p1 = vlib_get_buffer (vm, pi1);
536 ip0 = vlib_buffer_get_current (p0);
537 ip1 = vlib_buffer_get_current (p1);
538 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
539 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
541 lb0 = load_balance_get (lbi0);
542 lb1 = load_balance_get (lbi1);
545 * this node is for via FIBs we can re-use the hash value from the
546 * to node if present.
547 * We don't want to use the same hash value at each level in the recursion
548 * graph as that would lead to polarisation
552 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
554 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
556 hc0 = vnet_buffer (p0)->ip.flow_hash =
557 vnet_buffer (p0)->ip.flow_hash >> 1;
561 hc0 = vnet_buffer (p0)->ip.flow_hash =
562 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
564 dpo0 = load_balance_get_fwd_bucket
565 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
569 dpo0 = load_balance_get_bucket_i (lb0, 0);
571 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
573 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
575 hc1 = vnet_buffer (p1)->ip.flow_hash =
576 vnet_buffer (p1)->ip.flow_hash >> 1;
580 hc1 = vnet_buffer (p1)->ip.flow_hash =
581 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
583 dpo1 = load_balance_get_fwd_bucket
584 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
588 dpo1 = load_balance_get_bucket_i (lb1, 0);
591 next0 = dpo0->dpoi_next_node;
592 next1 = dpo1->dpoi_next_node;
594 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
595 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
597 vlib_increment_combined_counter
598 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
599 vlib_increment_combined_counter
600 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
602 vlib_validate_buffer_enqueue_x2 (vm, node, next,
603 to_next, n_left_to_next,
604 pi0, pi1, next0, next1);
607 while (n_left_from > 0 && n_left_to_next > 0)
609 ip_lookup_next_t next0;
610 const load_balance_t *lb0;
613 const ip4_header_t *ip0;
614 const dpo_id_t *dpo0;
623 p0 = vlib_get_buffer (vm, pi0);
625 ip0 = vlib_buffer_get_current (p0);
626 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
628 lb0 = load_balance_get (lbi0);
631 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
633 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
635 hc0 = vnet_buffer (p0)->ip.flow_hash =
636 vnet_buffer (p0)->ip.flow_hash >> 1;
640 hc0 = vnet_buffer (p0)->ip.flow_hash =
641 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
643 dpo0 = load_balance_get_fwd_bucket
644 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
648 dpo0 = load_balance_get_bucket_i (lb0, 0);
651 next0 = dpo0->dpoi_next_node;
652 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
654 vlib_increment_combined_counter
655 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
657 vlib_validate_buffer_enqueue_x1 (vm, node, next,
658 to_next, n_left_to_next,
662 vlib_put_next_frame (vm, node, next, n_left_to_next);
665 return frame->n_vectors;
668 VLIB_REGISTER_NODE (ip4_load_balance_node) =
670 .function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
671 sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
672 format_ip4_lookup_trace,};
674 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
676 /* get first interface address */
678 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
679 ip_interface_address_t ** result_ia)
681 ip_lookup_main_t *lm = &im->lookup_main;
682 ip_interface_address_t *ia = 0;
683 ip4_address_t *result = 0;
686 foreach_ip_interface_address
687 (lm, ia, sw_if_index,
688 1 /* honor unnumbered */ ,
691 ip_interface_address_get_address (lm, ia);
697 *result_ia = result ? ia : 0;
702 ip4_add_interface_routes (u32 sw_if_index,
703 ip4_main_t * im, u32 fib_index,
704 ip_interface_address_t * a)
706 ip_lookup_main_t *lm = &im->lookup_main;
707 ip4_address_t *address = ip_interface_address_get_address (lm, a);
709 .fp_len = a->address_length,
710 .fp_proto = FIB_PROTOCOL_IP4,
711 .fp_addr.ip4 = *address,
714 if (pfx.fp_len <= 30)
716 /* a /30 or shorter - add a glean for the network address */
717 fib_table_entry_update_one_path (fib_index, &pfx,
718 FIB_SOURCE_INTERFACE,
719 (FIB_ENTRY_FLAG_CONNECTED |
720 FIB_ENTRY_FLAG_ATTACHED),
722 /* No next-hop address */
728 // no out-label stack
730 FIB_ROUTE_PATH_FLAG_NONE);
732 /* Add the two broadcast addresses as drop */
733 fib_prefix_t net_pfx = {
735 .fp_proto = FIB_PROTOCOL_IP4,
736 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
738 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
739 fib_table_entry_special_add(fib_index,
741 FIB_SOURCE_INTERFACE,
742 (FIB_ENTRY_FLAG_DROP |
743 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
744 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
745 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
746 fib_table_entry_special_add(fib_index,
748 FIB_SOURCE_INTERFACE,
749 (FIB_ENTRY_FLAG_DROP |
750 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
752 else if (pfx.fp_len == 31)
754 u32 mask = clib_host_to_net_u32(1);
755 fib_prefix_t net_pfx = pfx;
758 net_pfx.fp_addr.ip4.as_u32 ^= mask;
760 /* a /31 - add the other end as an attached host */
761 fib_table_entry_update_one_path (fib_index, &net_pfx,
762 FIB_SOURCE_INTERFACE,
763 (FIB_ENTRY_FLAG_ATTACHED),
771 FIB_ROUTE_PATH_FLAG_NONE);
775 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
777 u32 classify_table_index =
778 lm->classify_table_index_by_sw_if_index[sw_if_index];
779 if (classify_table_index != (u32) ~ 0)
781 dpo_id_t dpo = DPO_INVALID;
786 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
788 fib_table_entry_special_dpo_add (fib_index,
791 FIB_ENTRY_FLAG_NONE, &dpo);
796 fib_table_entry_update_one_path (fib_index, &pfx,
797 FIB_SOURCE_INTERFACE,
798 (FIB_ENTRY_FLAG_CONNECTED |
799 FIB_ENTRY_FLAG_LOCAL),
806 FIB_ROUTE_PATH_FLAG_NONE);
810 ip4_del_interface_routes (ip4_main_t * im,
812 ip4_address_t * address, u32 address_length)
815 .fp_len = address_length,
816 .fp_proto = FIB_PROTOCOL_IP4,
817 .fp_addr.ip4 = *address,
820 if (pfx.fp_len <= 30)
822 fib_prefix_t net_pfx = {
824 .fp_proto = FIB_PROTOCOL_IP4,
825 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
827 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
828 fib_table_entry_special_remove(fib_index,
830 FIB_SOURCE_INTERFACE);
831 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
832 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
833 fib_table_entry_special_remove(fib_index,
835 FIB_SOURCE_INTERFACE);
836 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
838 else if (pfx.fp_len == 31)
840 u32 mask = clib_host_to_net_u32(1);
841 fib_prefix_t net_pfx = pfx;
844 net_pfx.fp_addr.ip4.as_u32 ^= mask;
846 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
850 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
854 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
856 ip4_main_t *im = &ip4_main;
858 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
861 * enable/disable only on the 1<->0 transition
865 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
870 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
871 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
874 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
878 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop",
879 sw_if_index, !is_enable, 0, 0);
882 static clib_error_t *
883 ip4_add_del_interface_address_internal (vlib_main_t * vm,
885 ip4_address_t * address,
886 u32 address_length, u32 is_del)
888 vnet_main_t *vnm = vnet_get_main ();
889 ip4_main_t *im = &ip4_main;
890 ip_lookup_main_t *lm = &im->lookup_main;
891 clib_error_t *error = 0;
892 u32 if_address_index, elts_before;
893 ip4_address_fib_t ip4_af, *addr_fib = 0;
895 /* local0 interface doesn't support IP addressing */
896 if (sw_if_index == 0)
899 clib_error_create ("local0 interface doesn't support IP addressing");
902 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
903 ip4_addr_fib_init (&ip4_af, address,
904 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
905 vec_add1 (addr_fib, ip4_af);
908 * there is no support for adj-fib handling in the presence of overlapping
909 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
915 /* When adding an address check that it does not conflict
916 with an existing address. */
917 ip_interface_address_t *ia;
918 foreach_ip_interface_address
919 (&im->lookup_main, ia, sw_if_index,
920 0 /* honor unnumbered */ ,
923 ip_interface_address_get_address
924 (&im->lookup_main, ia);
925 if (ip4_destination_matches_route
926 (im, address, x, ia->address_length) ||
927 ip4_destination_matches_route (im,
933 ("failed to add %U which conflicts with %U for interface %U",
934 format_ip4_address_and_length, address,
936 format_ip4_address_and_length, x,
938 format_vnet_sw_if_index_name, vnm,
944 elts_before = pool_elts (lm->if_address_pool);
946 error = ip_interface_address_add_del
947 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
951 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
954 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
956 ip4_add_interface_routes (sw_if_index,
957 im, ip4_af.fib_index,
959 (lm->if_address_pool, if_address_index));
961 /* If pool did not grow/shrink: add duplicate address. */
962 if (elts_before != pool_elts (lm->if_address_pool))
964 ip4_add_del_interface_address_callback_t *cb;
965 vec_foreach (cb, im->add_del_interface_address_callbacks)
966 cb->function (im, cb->function_opaque, sw_if_index,
967 address, address_length, if_address_index, is_del);
976 ip4_add_del_interface_address (vlib_main_t * vm,
978 ip4_address_t * address,
979 u32 address_length, u32 is_del)
981 return ip4_add_del_interface_address_internal
982 (vm, sw_if_index, address, address_length, is_del);
985 /* Built-in ip4 unicast rx feature path definition */
987 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
989 .arc_name = "ip4-unicast",
990 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
991 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
994 VNET_FEATURE_INIT (ip4_flow_classify, static) =
996 .arc_name = "ip4-unicast",
997 .node_name = "ip4-flow-classify",
998 .runs_before = VNET_FEATURES ("ip4-inacl"),
1001 VNET_FEATURE_INIT (ip4_inacl, static) =
1003 .arc_name = "ip4-unicast",
1004 .node_name = "ip4-inacl",
1005 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
1008 VNET_FEATURE_INIT (ip4_source_check_1, static) =
1010 .arc_name = "ip4-unicast",
1011 .node_name = "ip4-source-check-via-rx",
1012 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
1015 VNET_FEATURE_INIT (ip4_source_check_2, static) =
1017 .arc_name = "ip4-unicast",
1018 .node_name = "ip4-source-check-via-any",
1019 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1022 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
1024 .arc_name = "ip4-unicast",
1025 .node_name = "ip4-source-and-port-range-check-rx",
1026 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1029 VNET_FEATURE_INIT (ip4_policer_classify, static) =
1031 .arc_name = "ip4-unicast",
1032 .node_name = "ip4-policer-classify",
1033 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1036 VNET_FEATURE_INIT (ip4_ipsec, static) =
1038 .arc_name = "ip4-unicast",
1039 .node_name = "ipsec-input-ip4",
1040 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1043 VNET_FEATURE_INIT (ip4_vpath, static) =
1045 .arc_name = "ip4-unicast",
1046 .node_name = "vpath-input-ip4",
1047 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1050 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1052 .arc_name = "ip4-unicast",
1053 .node_name = "ip4-vxlan-bypass",
1054 .runs_before = VNET_FEATURES ("ip4-lookup"),
1057 VNET_FEATURE_INIT (ip4_drop, static) =
1059 .arc_name = "ip4-unicast",
1060 .node_name = "ip4-drop",
1061 .runs_before = VNET_FEATURES ("ip4-lookup"),
1064 VNET_FEATURE_INIT (ip4_lookup, static) =
1066 .arc_name = "ip4-unicast",
1067 .node_name = "ip4-lookup",
1068 .runs_before = 0, /* not before any other features */
1071 /* Built-in ip4 multicast rx feature path definition */
1072 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1074 .arc_name = "ip4-multicast",
1075 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1076 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1079 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1081 .arc_name = "ip4-multicast",
1082 .node_name = "vpath-input-ip4",
1083 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1086 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1088 .arc_name = "ip4-multicast",
1089 .node_name = "ip4-drop",
1090 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1093 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1095 .arc_name = "ip4-multicast",
1096 .node_name = "ip4-mfib-forward-lookup",
1097 .runs_before = 0, /* last feature */
1100 /* Source and port-range check ip4 tx feature path definition */
1101 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1103 .arc_name = "ip4-output",
1104 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1105 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1108 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1110 .arc_name = "ip4-output",
1111 .node_name = "ip4-source-and-port-range-check-tx",
1112 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1115 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1117 .arc_name = "ip4-output",
1118 .node_name = "ipsec-output-ip4",
1119 .runs_before = VNET_FEATURES ("interface-output"),
1122 /* Built-in ip4 tx feature path definition */
1123 VNET_FEATURE_INIT (ip4_interface_output, static) =
1125 .arc_name = "ip4-output",
1126 .node_name = "interface-output",
1127 .runs_before = 0, /* not before any other features */
1131 static clib_error_t *
1132 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1134 ip4_main_t *im = &ip4_main;
1136 /* Fill in lookup tables with default table (0). */
1137 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1138 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1142 ip4_main_t *im4 = &ip4_main;
1143 ip_lookup_main_t *lm4 = &im4->lookup_main;
1144 ip_interface_address_t *ia = 0;
1145 ip4_address_t *address;
1146 vlib_main_t *vm = vlib_get_main ();
1149 foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* honor unnumbered */,
1151 address = ip_interface_address_get_address (lm4, ia);
1152 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1157 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1160 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1163 return /* no error */ 0;
1166 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1168 /* Global IP4 main. */
1169 ip4_main_t ip4_main;
1172 ip4_lookup_init (vlib_main_t * vm)
1174 ip4_main_t *im = &ip4_main;
1175 clib_error_t *error;
1178 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1181 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1186 m = pow2_mask (i) << (32 - i);
1189 im->fib_masks[i] = clib_host_to_net_u32 (m);
1192 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1194 /* Create FIB with index 0 and table id of 0. */
1195 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1196 FIB_SOURCE_DEFAULT_ROUTE);
1197 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0,
1198 MFIB_SOURCE_DEFAULT_ROUTE);
1202 pn = pg_get_node (ip4_lookup_node.index);
1203 pn->unformat_edit = unformat_pg_ip4_header;
1207 ethernet_arp_header_t h;
1209 memset (&h, 0, sizeof (h));
1211 /* Set target ethernet address to all zeros. */
1212 memset (h.ip4_over_ethernet[1].ethernet, 0,
1213 sizeof (h.ip4_over_ethernet[1].ethernet));
1215 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1216 #define _8(f,v) h.f = v;
1217 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1218 _16 (l3_type, ETHERNET_TYPE_IP4);
1219 _8 (n_l2_address_bytes, 6);
1220 _8 (n_l3_address_bytes, 4);
1221 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1225 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1228 /* alloc chunk size */ 8,
1235 VLIB_INIT_FUNCTION (ip4_lookup_init);
1239 /* Adjacency taken. */
1244 /* Packet data, possibly *after* rewrite. */
1245 u8 packet_data[64 - 1 * sizeof (u32)];
1247 ip4_forward_next_trace_t;
1250 format_ip4_forward_next_trace (u8 * s, va_list * args)
1252 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1253 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1254 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1255 u32 indent = format_get_indent (s);
1256 s = format (s, "%U%U",
1257 format_white_space, indent,
1258 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1263 format_ip4_lookup_trace (u8 * s, va_list * args)
1265 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1266 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1267 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1268 u32 indent = format_get_indent (s);
1270 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1271 t->fib_index, t->dpo_index, t->flow_hash);
1272 s = format (s, "\n%U%U",
1273 format_white_space, indent,
1274 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1279 format_ip4_rewrite_trace (u8 * s, va_list * args)
1281 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1282 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1283 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1284 u32 indent = format_get_indent (s);
1286 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1287 t->fib_index, t->dpo_index, format_ip_adjacency,
1288 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1289 s = format (s, "\n%U%U",
1290 format_white_space, indent,
1291 format_ip_adjacency_packet_data,
1292 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1296 /* Common trace function for all ip4-forward next nodes. */
1298 ip4_forward_next_trace (vlib_main_t * vm,
1299 vlib_node_runtime_t * node,
1300 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1303 ip4_main_t *im = &ip4_main;
1305 n_left = frame->n_vectors;
1306 from = vlib_frame_vector_args (frame);
1311 vlib_buffer_t *b0, *b1;
1312 ip4_forward_next_trace_t *t0, *t1;
1314 /* Prefetch next iteration. */
1315 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1316 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1321 b0 = vlib_get_buffer (vm, bi0);
1322 b1 = vlib_get_buffer (vm, bi1);
1324 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1326 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1327 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1328 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1330 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1331 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1332 vec_elt (im->fib_index_by_sw_if_index,
1333 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1335 clib_memcpy (t0->packet_data,
1336 vlib_buffer_get_current (b0),
1337 sizeof (t0->packet_data));
1339 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1341 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1342 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1343 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1345 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1346 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1347 vec_elt (im->fib_index_by_sw_if_index,
1348 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1349 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1350 sizeof (t1->packet_data));
1360 ip4_forward_next_trace_t *t0;
1364 b0 = vlib_get_buffer (vm, bi0);
1366 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1368 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1369 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1370 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1372 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1373 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1374 vec_elt (im->fib_index_by_sw_if_index,
1375 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1376 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1377 sizeof (t0->packet_data));
1384 /* Compute TCP/UDP/ICMP4 checksum in software. */
1386 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1390 u32 ip_header_length, payload_length_host_byte_order;
1391 u32 n_this_buffer, n_bytes_left, n_ip_bytes_this_buffer;
1393 void *data_this_buffer;
1395 /* Initialize checksum with ip header. */
1396 ip_header_length = ip4_header_bytes (ip0);
1397 payload_length_host_byte_order =
1398 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1400 clib_host_to_net_u32 (payload_length_host_byte_order +
1401 (ip0->protocol << 16));
1403 if (BITS (uword) == 32)
1406 ip_csum_with_carry (sum0,
1407 clib_mem_unaligned (&ip0->src_address, u32));
1409 ip_csum_with_carry (sum0,
1410 clib_mem_unaligned (&ip0->dst_address, u32));
1414 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1416 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1417 data_this_buffer = (void *) ip0 + ip_header_length;
1418 n_ip_bytes_this_buffer =
1419 p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data);
1420 if (n_this_buffer + ip_header_length > n_ip_bytes_this_buffer)
1422 n_this_buffer = n_ip_bytes_this_buffer > ip_header_length ?
1423 n_ip_bytes_this_buffer - ip_header_length : 0;
1427 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1428 n_bytes_left -= n_this_buffer;
1429 if (n_bytes_left == 0)
1432 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1433 p0 = vlib_get_buffer (vm, p0->next_buffer);
1434 data_this_buffer = vlib_buffer_get_current (p0);
1435 n_this_buffer = p0->current_length;
1438 sum16 = ~ip_csum_fold (sum0);
1444 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1446 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1450 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1451 || ip0->protocol == IP_PROTOCOL_UDP);
1453 udp0 = (void *) (ip0 + 1);
1454 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1456 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1457 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1461 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1463 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1464 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1470 VNET_FEATURE_ARC_INIT (ip4_local) =
1472 .arc_name = "ip4-local",
1473 .start_nodes = VNET_FEATURES ("ip4-local"),
1478 ip4_local_validate_l4 (vlib_main_t * vm, vlib_buffer_t * p, ip4_header_t * ip,
1479 u8 is_udp, u8 * error, u8 * good_tcp_udp)
1482 flags0 = ip4_tcp_udp_validate_checksum (vm, p);
1483 *good_tcp_udp = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1487 u32 ip_len, udp_len;
1489 udp = ip4_next_header (ip);
1490 /* Verify UDP length. */
1491 ip_len = clib_net_to_host_u16 (ip->length);
1492 udp_len = clib_net_to_host_u16 (udp->length);
1494 len_diff = ip_len - udp_len;
1495 *good_tcp_udp &= len_diff >= 0;
1496 *error = len_diff < 0 ? IP4_ERROR_UDP_LENGTH : *error;
1500 #define ip4_local_do_l4_check(is_tcp_udp, flags) \
1501 (is_tcp_udp && !(flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1504 ip4_local_inline (vlib_main_t * vm,
1505 vlib_node_runtime_t * node,
1506 vlib_frame_t * frame, int head_of_feature_arc)
1508 ip4_main_t *im = &ip4_main;
1509 ip_lookup_main_t *lm = &im->lookup_main;
1510 ip_local_next_t next_index;
1511 u32 *from, *to_next, n_left_from, n_left_to_next;
1512 vlib_node_runtime_t *error_node =
1513 vlib_node_get_runtime (vm, ip4_input_node.index);
1514 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1516 from = vlib_frame_vector_args (frame);
1517 n_left_from = frame->n_vectors;
1518 next_index = node->cached_next_index;
1520 if (node->flags & VLIB_NODE_FLAG_TRACE)
1521 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1523 while (n_left_from > 0)
1525 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1527 while (n_left_from >= 4 && n_left_to_next >= 2)
1529 vlib_buffer_t *p0, *p1;
1530 ip4_header_t *ip0, *ip1;
1531 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1532 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1533 const dpo_id_t *dpo0, *dpo1;
1534 const load_balance_t *lb0, *lb1;
1535 u32 pi0, next0, fib_index0, lbi0;
1536 u32 pi1, next1, fib_index1, lbi1;
1537 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1538 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1539 u32 sw_if_index0, sw_if_index1;
1541 pi0 = to_next[0] = from[0];
1542 pi1 = to_next[1] = from[1];
1546 n_left_to_next -= 2;
1548 next0 = next1 = IP_LOCAL_NEXT_DROP;
1549 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1551 p0 = vlib_get_buffer (vm, pi0);
1552 p1 = vlib_get_buffer (vm, pi1);
1554 ip0 = vlib_buffer_get_current (p0);
1555 ip1 = vlib_buffer_get_current (p1);
1557 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1558 vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1560 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1561 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1563 /* Treat IP frag packets as "experimental" protocol for now
1564 until support of IP frag reassembly is implemented */
1565 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1566 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1568 if (head_of_feature_arc == 0)
1571 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1572 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1573 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1574 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1577 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1579 (p1->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1581 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)
1582 || ip4_local_do_l4_check (is_tcp_udp1,
1586 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1589 ip4_local_validate_l4 (vm, p1, ip1, is_udp1, &error1,
1593 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1594 error0 = (is_tcp_udp0 && !good_tcp_udp0
1595 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1596 error1 = (is_tcp_udp1 && !good_tcp_udp1
1597 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1599 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1601 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1602 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1604 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1606 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1607 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1609 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1610 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1612 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1613 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1614 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1616 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1618 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1620 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1623 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1624 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1625 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1627 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1628 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1629 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1631 lb0 = load_balance_get (lbi0);
1632 lb1 = load_balance_get (lbi1);
1633 dpo0 = load_balance_get_bucket_i (lb0, 0);
1634 dpo1 = load_balance_get_bucket_i (lb1, 0);
1637 * Must have a route to source otherwise we drop the packet.
1638 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1641 * - the source is a recieve => it's from us => bogus, do this
1642 * first since it sets a different error code.
1643 * - uRPF check for any route to source - accept if passes.
1644 * - allow packets destined to the broadcast address from unknown sources
1646 if (p0->flags & VNET_BUFFER_F_IS_NATED)
1649 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1650 dpo0->dpoi_type == DPO_RECEIVE) ?
1651 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1652 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1653 !fib_urpf_check_size (lb0->lb_urpf) &&
1654 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1655 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1658 if (p1->flags & VNET_BUFFER_F_IS_NATED)
1661 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1662 dpo1->dpoi_type == DPO_RECEIVE) ?
1663 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1664 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1665 !fib_urpf_check_size (lb1->lb_urpf) &&
1666 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1667 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1671 next0 = lm->local_next_by_ip_protocol[proto0];
1672 next1 = lm->local_next_by_ip_protocol[proto1];
1675 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1677 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1679 p0->error = error0 ? error_node->errors[error0] : 0;
1680 p1->error = error1 ? error_node->errors[error1] : 0;
1682 if (head_of_feature_arc)
1684 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1685 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1686 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1687 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1690 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1691 n_left_to_next, pi0, pi1,
1695 while (n_left_from > 0 && n_left_to_next > 0)
1699 ip4_fib_mtrie_t *mtrie0;
1700 ip4_fib_mtrie_leaf_t leaf0;
1701 u32 pi0, next0, fib_index0, lbi0;
1702 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1703 load_balance_t *lb0;
1704 const dpo_id_t *dpo0;
1707 pi0 = to_next[0] = from[0];
1711 n_left_to_next -= 1;
1713 next0 = IP_LOCAL_NEXT_DROP;
1714 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1716 p0 = vlib_get_buffer (vm, pi0);
1717 ip0 = vlib_buffer_get_current (p0);
1718 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1719 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1721 /* Treat IP frag packets as "experimental" protocol for now
1722 until support of IP frag reassembly is implemented */
1723 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1725 if (head_of_feature_arc == 0 || p0->flags & VNET_BUFFER_F_IS_NATED)
1728 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1729 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1731 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1733 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)))
1735 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1739 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1740 error0 = (is_tcp_udp0 && !good_tcp_udp0
1741 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1743 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1745 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1746 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1747 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1748 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1749 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1751 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1753 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1754 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1755 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1757 lb0 = load_balance_get (lbi0);
1758 dpo0 = load_balance_get_bucket_i (lb0, 0);
1760 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1761 dpo0->dpoi_type == DPO_RECEIVE) ?
1762 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1763 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1764 !fib_urpf_check_size (lb0->lb_urpf) &&
1765 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1766 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1769 next0 = lm->local_next_by_ip_protocol[proto0];
1771 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1773 p0->error = error0 ? error_node->errors[error0] : 0;
1775 if (head_of_feature_arc)
1777 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1778 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1781 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1782 n_left_to_next, pi0, next0);
1784 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1787 return frame->n_vectors;
1791 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1793 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1797 VLIB_REGISTER_NODE (ip4_local_node) =
1799 .function = ip4_local,
1800 .name = "ip4-local",
1801 .vector_size = sizeof (u32),
1802 .format_trace = format_ip4_forward_next_trace,
1803 .n_next_nodes = IP_LOCAL_N_NEXT,
1806 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1807 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1808 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1809 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1814 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1817 ip4_local_end_of_arc (vlib_main_t * vm,
1818 vlib_node_runtime_t * node, vlib_frame_t * frame)
1820 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1824 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1825 .function = ip4_local_end_of_arc,
1826 .name = "ip4-local-end-of-arc",
1827 .vector_size = sizeof (u32),
1829 .format_trace = format_ip4_forward_next_trace,
1830 .sibling_of = "ip4-local",
1833 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1835 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1836 .arc_name = "ip4-local",
1837 .node_name = "ip4-local-end-of-arc",
1838 .runs_before = 0, /* not before any other features */
1843 ip4_register_protocol (u32 protocol, u32 node_index)
1845 vlib_main_t *vm = vlib_get_main ();
1846 ip4_main_t *im = &ip4_main;
1847 ip_lookup_main_t *lm = &im->lookup_main;
1849 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1850 lm->local_next_by_ip_protocol[protocol] =
1851 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1854 static clib_error_t *
1855 show_ip_local_command_fn (vlib_main_t * vm,
1856 unformat_input_t * input, vlib_cli_command_t * cmd)
1858 ip4_main_t *im = &ip4_main;
1859 ip_lookup_main_t *lm = &im->lookup_main;
1862 vlib_cli_output (vm, "Protocols handled by ip4_local");
1863 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1865 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1867 u32 node_index = vlib_get_node (vm,
1868 ip4_local_node.index)->
1869 next_nodes[lm->local_next_by_ip_protocol[i]];
1870 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1880 * Display the set of protocols handled by the local IPv4 stack.
1883 * Example of how to display local protocol table:
1884 * @cliexstart{show ip local}
1885 * Protocols handled by ip4_local
1892 VLIB_CLI_COMMAND (show_ip_local, static) =
1894 .path = "show ip local",
1895 .function = show_ip_local_command_fn,
1896 .short_help = "show ip local",
1901 ip4_arp_inline (vlib_main_t * vm,
1902 vlib_node_runtime_t * node,
1903 vlib_frame_t * frame, int is_glean)
1905 vnet_main_t *vnm = vnet_get_main ();
1906 ip4_main_t *im = &ip4_main;
1907 ip_lookup_main_t *lm = &im->lookup_main;
1908 u32 *from, *to_next_drop;
1909 uword n_left_from, n_left_to_next_drop, next_index;
1910 static f64 time_last_seed_change = -1e100;
1911 static u32 hash_seeds[3];
1912 static uword hash_bitmap[256 / BITS (uword)];
1915 if (node->flags & VLIB_NODE_FLAG_TRACE)
1916 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1918 time_now = vlib_time_now (vm);
1919 if (time_now - time_last_seed_change > 1e-3)
1922 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
1923 sizeof (hash_seeds));
1924 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1925 hash_seeds[i] = r[i];
1927 /* Mark all hash keys as been no-seen before. */
1928 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1931 time_last_seed_change = time_now;
1934 from = vlib_frame_vector_args (frame);
1935 n_left_from = frame->n_vectors;
1936 next_index = node->cached_next_index;
1937 if (next_index == IP4_ARP_NEXT_DROP)
1938 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1940 while (n_left_from > 0)
1942 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1943 to_next_drop, n_left_to_next_drop);
1945 while (n_left_from > 0 && n_left_to_next_drop > 0)
1947 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1948 ip_adjacency_t *adj0;
1955 p0 = vlib_get_buffer (vm, pi0);
1957 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1958 adj0 = adj_get (adj_index0);
1959 ip0 = vlib_buffer_get_current (p0);
1965 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1966 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1971 * this is the Glean case, so we are ARPing for the
1972 * packet's destination
1974 a0 ^= ip0->dst_address.data_u32;
1978 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
1982 hash_v3_mix32 (a0, b0, c0);
1983 hash_v3_finalize32 (a0, b0, c0);
1985 c0 &= BITS (hash_bitmap) - 1;
1986 m0 = (uword) 1 << (c0 % BITS (uword));
1987 c0 = c0 / BITS (uword);
1989 bm0 = hash_bitmap[c0];
1990 drop0 = (bm0 & m0) != 0;
1992 /* Mark it as seen. */
1993 hash_bitmap[c0] = bm0 | m0;
1997 to_next_drop[0] = pi0;
1999 n_left_to_next_drop -= 1;
2002 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2003 IP4_ARP_ERROR_REQUEST_SENT];
2006 * the adj has been updated to a rewrite but the node the DPO that got
2007 * us here hasn't - yet. no big deal. we'll drop while we wait.
2009 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2016 * Can happen if the control-plane is programming tables
2017 * with traffic flowing; at least that's today's lame excuse.
2019 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2020 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2022 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2025 /* Send ARP request. */
2029 ethernet_arp_header_t *h0;
2030 vnet_hw_interface_t *hw_if0;
2033 vlib_packet_template_get_packet (vm,
2034 &im->ip4_arp_request_packet_template,
2037 /* Add rewrite/encap string for ARP packet. */
2038 vnet_rewrite_one_header (adj0[0], h0,
2039 sizeof (ethernet_header_t));
2041 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2043 /* Src ethernet address in ARP header. */
2044 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2046 sizeof (h0->ip4_over_ethernet[0].ethernet));
2050 /* The interface's source address is stashed in the Glean Adj */
2051 h0->ip4_over_ethernet[0].ip4 =
2052 adj0->sub_type.glean.receive_addr.ip4;
2054 /* Copy in destination address we are requesting. This is the
2055 * glean case, so it's the packet's destination.*/
2056 h0->ip4_over_ethernet[1].ip4.data_u32 =
2057 ip0->dst_address.data_u32;
2061 /* Src IP address in ARP header. */
2062 if (ip4_src_address_for_packet (lm, sw_if_index0,
2064 ip4_over_ethernet[0].ip4))
2066 /* No source address available */
2068 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2069 vlib_buffer_free (vm, &bi0, 1);
2073 /* Copy in destination address we are requesting from the
2075 h0->ip4_over_ethernet[1].ip4.data_u32 =
2076 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2079 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2080 b0 = vlib_get_buffer (vm, bi0);
2081 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
2082 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2084 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2086 vlib_set_next_frame_buffer (vm, node,
2087 adj0->rewrite_header.next_index,
2092 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2095 return frame->n_vectors;
2099 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2101 return (ip4_arp_inline (vm, node, frame, 0));
2105 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2107 return (ip4_arp_inline (vm, node, frame, 1));
2110 static char *ip4_arp_error_strings[] = {
2111 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2112 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2113 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2114 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2115 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2116 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2119 VLIB_REGISTER_NODE (ip4_arp_node) =
2121 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2122 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2123 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2124 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2126 [IP4_ARP_NEXT_DROP] = "error-drop",}
2129 VLIB_REGISTER_NODE (ip4_glean_node) =
2131 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2132 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2133 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2134 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2136 [IP4_ARP_NEXT_DROP] = "error-drop",}
2139 #define foreach_notrace_ip4_arp_error \
2146 arp_notrace_init (vlib_main_t * vm)
2148 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2150 /* don't trace ARP request packets */
2152 vnet_pcap_drop_trace_filter_add_del \
2153 (rt->errors[IP4_ARP_ERROR_##a], \
2155 foreach_notrace_ip4_arp_error;
2160 VLIB_INIT_FUNCTION (arp_notrace_init);
2163 /* Send an ARP request to see if given destination is reachable on given interface. */
2165 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2167 vnet_main_t *vnm = vnet_get_main ();
2168 ip4_main_t *im = &ip4_main;
2169 ethernet_arp_header_t *h;
2171 ip_interface_address_t *ia;
2172 ip_adjacency_t *adj;
2173 vnet_hw_interface_t *hi;
2174 vnet_sw_interface_t *si;
2179 si = vnet_get_sw_interface (vnm, sw_if_index);
2181 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2183 return clib_error_return (0, "%U: interface %U down",
2184 format_ip4_address, dst,
2185 format_vnet_sw_if_index_name, vnm,
2190 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2193 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2194 return clib_error_return
2196 "no matching interface address for destination %U (interface %U)",
2197 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2201 h = vlib_packet_template_get_packet (vm,
2202 &im->ip4_arp_request_packet_template,
2205 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2206 if (PREDICT_FALSE (!hi->hw_address))
2208 return clib_error_return (0, "%U: interface %U do not support ip probe",
2209 format_ip4_address, dst,
2210 format_vnet_sw_if_index_name, vnm,
2214 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2215 sizeof (h->ip4_over_ethernet[0].ethernet));
2217 h->ip4_over_ethernet[0].ip4 = src[0];
2218 h->ip4_over_ethernet[1].ip4 = dst[0];
2220 b = vlib_get_buffer (vm, bi);
2221 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2222 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2224 ip46_address_t nh = {
2228 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2229 VNET_LINK_IP4, &nh, sw_if_index);
2232 /* Peer has been previously resolved, retrieve glean adj instead */
2233 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2236 ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4, sw_if_index, &nh);
2240 /* Add encapsulation string for software interface (e.g. ethernet header). */
2241 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2242 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2245 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2246 u32 *to_next = vlib_frame_vector_args (f);
2249 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2253 return /* no error */ 0;
2258 IP4_REWRITE_NEXT_DROP,
2259 IP4_REWRITE_NEXT_ICMP_ERROR,
2260 } ip4_rewrite_next_t;
2263 ip4_rewrite_inline (vlib_main_t * vm,
2264 vlib_node_runtime_t * node,
2265 vlib_frame_t * frame,
2266 int do_counters, int is_midchain, int is_mcast)
2268 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2269 u32 *from = vlib_frame_vector_args (frame);
2270 u32 n_left_from, n_left_to_next, *to_next, next_index;
2271 vlib_node_runtime_t *error_node =
2272 vlib_node_get_runtime (vm, ip4_input_node.index);
2274 n_left_from = frame->n_vectors;
2275 next_index = node->cached_next_index;
2276 u32 thread_index = vlib_get_thread_index ();
2278 while (n_left_from > 0)
2280 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2282 while (n_left_from >= 4 && n_left_to_next >= 2)
2284 ip_adjacency_t *adj0, *adj1;
2285 vlib_buffer_t *p0, *p1;
2286 ip4_header_t *ip0, *ip1;
2287 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2288 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2289 u32 tx_sw_if_index0, tx_sw_if_index1;
2291 /* Prefetch next iteration. */
2293 vlib_buffer_t *p2, *p3;
2295 p2 = vlib_get_buffer (vm, from[2]);
2296 p3 = vlib_get_buffer (vm, from[3]);
2298 vlib_prefetch_buffer_header (p2, STORE);
2299 vlib_prefetch_buffer_header (p3, STORE);
2301 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2302 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2305 pi0 = to_next[0] = from[0];
2306 pi1 = to_next[1] = from[1];
2311 n_left_to_next -= 2;
2313 p0 = vlib_get_buffer (vm, pi0);
2314 p1 = vlib_get_buffer (vm, pi1);
2316 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2317 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2320 * pre-fetch the per-adjacency counters
2324 vlib_prefetch_combined_counter (&adjacency_counters,
2325 thread_index, adj_index0);
2326 vlib_prefetch_combined_counter (&adjacency_counters,
2327 thread_index, adj_index1);
2330 ip0 = vlib_buffer_get_current (p0);
2331 ip1 = vlib_buffer_get_current (p1);
2333 error0 = error1 = IP4_ERROR_NONE;
2334 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2336 /* Decrement TTL & update checksum.
2337 Works either endian, so no need for byte swap. */
2338 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2340 i32 ttl0 = ip0->ttl;
2342 /* Input node should have reject packets with ttl 0. */
2343 ASSERT (ip0->ttl > 0);
2345 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2346 checksum0 += checksum0 >= 0xffff;
2348 ip0->checksum = checksum0;
2353 * If the ttl drops below 1 when forwarding, generate
2356 if (PREDICT_FALSE (ttl0 <= 0))
2358 error0 = IP4_ERROR_TIME_EXPIRED;
2359 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2360 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2361 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2363 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2366 /* Verify checksum. */
2367 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2368 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2372 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2374 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2376 i32 ttl1 = ip1->ttl;
2378 /* Input node should have reject packets with ttl 0. */
2379 ASSERT (ip1->ttl > 0);
2381 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2382 checksum1 += checksum1 >= 0xffff;
2384 ip1->checksum = checksum1;
2389 * If the ttl drops below 1 when forwarding, generate
2392 if (PREDICT_FALSE (ttl1 <= 0))
2394 error1 = IP4_ERROR_TIME_EXPIRED;
2395 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2396 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2397 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2399 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2402 /* Verify checksum. */
2403 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2404 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2408 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2411 /* Rewrite packet header and updates lengths. */
2412 adj0 = adj_get (adj_index0);
2413 adj1 = adj_get (adj_index1);
2415 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2416 rw_len0 = adj0[0].rewrite_header.data_bytes;
2417 rw_len1 = adj1[0].rewrite_header.data_bytes;
2418 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2419 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2421 /* Check MTU of outgoing interface. */
2423 (vlib_buffer_length_in_chain (vm, p0) >
2425 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2428 (vlib_buffer_length_in_chain (vm, p1) >
2430 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2433 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2434 * to see the IP headerr */
2435 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2437 next0 = adj0[0].rewrite_header.next_index;
2438 p0->current_data -= rw_len0;
2439 p0->current_length += rw_len0;
2440 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2441 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2444 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2445 vnet_feature_arc_start (lm->output_feature_arc_index,
2446 tx_sw_if_index0, &next0, p0);
2448 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2450 next1 = adj1[0].rewrite_header.next_index;
2451 p1->current_data -= rw_len1;
2452 p1->current_length += rw_len1;
2454 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2455 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2458 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2459 vnet_feature_arc_start (lm->output_feature_arc_index,
2460 tx_sw_if_index1, &next1, p1);
2463 /* Guess we are only writing on simple Ethernet header. */
2464 vnet_rewrite_two_headers (adj0[0], adj1[0],
2465 ip0, ip1, sizeof (ethernet_header_t));
2468 * Bump the per-adjacency counters
2472 vlib_increment_combined_counter
2473 (&adjacency_counters,
2476 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2478 vlib_increment_combined_counter
2479 (&adjacency_counters,
2482 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2487 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2488 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2493 * copy bytes from the IP address into the MAC rewrite
2495 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2496 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2499 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2500 to_next, n_left_to_next,
2501 pi0, pi1, next0, next1);
2504 while (n_left_from > 0 && n_left_to_next > 0)
2506 ip_adjacency_t *adj0;
2509 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2510 u32 tx_sw_if_index0;
2512 pi0 = to_next[0] = from[0];
2514 p0 = vlib_get_buffer (vm, pi0);
2516 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2518 adj0 = adj_get (adj_index0);
2520 ip0 = vlib_buffer_get_current (p0);
2522 error0 = IP4_ERROR_NONE;
2523 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2525 /* Decrement TTL & update checksum. */
2526 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2528 i32 ttl0 = ip0->ttl;
2530 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2532 checksum0 += checksum0 >= 0xffff;
2534 ip0->checksum = checksum0;
2536 ASSERT (ip0->ttl > 0);
2542 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2543 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2545 if (PREDICT_FALSE (ttl0 <= 0))
2548 * If the ttl drops below 1 when forwarding, generate
2551 error0 = IP4_ERROR_TIME_EXPIRED;
2552 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2553 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2554 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2555 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2561 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2565 vlib_prefetch_combined_counter (&adjacency_counters,
2566 thread_index, adj_index0);
2568 /* Guess we are only writing on simple Ethernet header. */
2569 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2573 * copy bytes from the IP address into the MAC rewrite
2575 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2578 /* Update packet buffer attributes/set output interface. */
2579 rw_len0 = adj0[0].rewrite_header.data_bytes;
2580 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2583 vlib_increment_combined_counter
2584 (&adjacency_counters,
2585 thread_index, adj_index0, 1,
2586 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2588 /* Check MTU of outgoing interface. */
2589 error0 = (vlib_buffer_length_in_chain (vm, p0)
2590 > adj0[0].rewrite_header.max_l3_packet_bytes
2591 ? IP4_ERROR_MTU_EXCEEDED : error0);
2593 p0->error = error_node->errors[error0];
2595 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2596 * to see the IP headerr */
2597 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2599 p0->current_data -= rw_len0;
2600 p0->current_length += rw_len0;
2601 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2603 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2604 next0 = adj0[0].rewrite_header.next_index;
2608 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2612 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2613 vnet_feature_arc_start (lm->output_feature_arc_index,
2614 tx_sw_if_index0, &next0, p0);
2621 n_left_to_next -= 1;
2623 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2624 to_next, n_left_to_next,
2628 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2631 /* Need to do trace after rewrites to pick up new packet data. */
2632 if (node->flags & VLIB_NODE_FLAG_TRACE)
2633 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2635 return frame->n_vectors;
2639 /** @brief IPv4 rewrite node.
2642 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2643 header checksum, fetch the ip adjacency, check the outbound mtu,
2644 apply the adjacency rewrite, and send pkts to the adjacency
2645 rewrite header's rewrite_next_index.
2647 @param vm vlib_main_t corresponding to the current thread
2648 @param node vlib_node_runtime_t
2649 @param frame vlib_frame_t whose contents should be dispatched
2651 @par Graph mechanics: buffer metadata, next index usage
2654 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2655 - the rewrite adjacency index
2656 - <code>adj->lookup_next_index</code>
2657 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2658 the packet will be dropped.
2659 - <code>adj->rewrite_header</code>
2660 - Rewrite string length, rewrite string, next_index
2663 - <code>b->current_data, b->current_length</code>
2664 - Updated net of applying the rewrite string
2666 <em>Next Indices:</em>
2667 - <code> adj->rewrite_header.next_index </code>
2671 ip4_rewrite (vlib_main_t * vm,
2672 vlib_node_runtime_t * node, vlib_frame_t * frame)
2674 if (adj_are_counters_enabled ())
2675 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2677 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2681 ip4_midchain (vlib_main_t * vm,
2682 vlib_node_runtime_t * node, vlib_frame_t * frame)
2684 if (adj_are_counters_enabled ())
2685 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2687 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2691 ip4_rewrite_mcast (vlib_main_t * vm,
2692 vlib_node_runtime_t * node, vlib_frame_t * frame)
2694 if (adj_are_counters_enabled ())
2695 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2697 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2701 ip4_mcast_midchain (vlib_main_t * vm,
2702 vlib_node_runtime_t * node, vlib_frame_t * frame)
2704 if (adj_are_counters_enabled ())
2705 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2707 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2711 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2712 .function = ip4_rewrite,
2713 .name = "ip4-rewrite",
2714 .vector_size = sizeof (u32),
2716 .format_trace = format_ip4_rewrite_trace,
2720 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2721 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2724 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2726 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2727 .function = ip4_rewrite_mcast,
2728 .name = "ip4-rewrite-mcast",
2729 .vector_size = sizeof (u32),
2731 .format_trace = format_ip4_rewrite_trace,
2732 .sibling_of = "ip4-rewrite",
2734 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2736 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2737 .function = ip4_mcast_midchain,
2738 .name = "ip4-mcast-midchain",
2739 .vector_size = sizeof (u32),
2741 .format_trace = format_ip4_rewrite_trace,
2742 .sibling_of = "ip4-rewrite",
2744 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2746 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2747 .function = ip4_midchain,
2748 .name = "ip4-midchain",
2749 .vector_size = sizeof (u32),
2750 .format_trace = format_ip4_forward_next_trace,
2751 .sibling_of = "ip4-rewrite",
2753 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2757 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2759 ip4_fib_mtrie_t *mtrie0;
2760 ip4_fib_mtrie_leaf_t leaf0;
2763 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2765 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2766 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2767 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2769 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2771 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2774 static clib_error_t *
2775 test_lookup_command_fn (vlib_main_t * vm,
2776 unformat_input_t * input, vlib_cli_command_t * cmd)
2783 ip4_address_t ip4_base_address;
2786 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2788 if (unformat (input, "table %d", &table_id))
2790 /* Make sure the entry exists. */
2791 fib = ip4_fib_get (table_id);
2792 if ((fib) && (fib->index != table_id))
2793 return clib_error_return (0, "<fib-index> %d does not exist",
2796 else if (unformat (input, "count %f", &count))
2799 else if (unformat (input, "%U",
2800 unformat_ip4_address, &ip4_base_address))
2803 return clib_error_return (0, "unknown input `%U'",
2804 format_unformat_error, input);
2809 for (i = 0; i < n; i++)
2811 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2814 ip4_base_address.as_u32 =
2815 clib_host_to_net_u32 (1 +
2816 clib_net_to_host_u32 (ip4_base_address.as_u32));
2820 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2822 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2828 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2829 * given FIB table to determine if there is a conflict with the
2830 * adjacency table. The fib-id can be determined by using the
2831 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2834 * @todo This command uses fib-id, other commands use table-id (not
2835 * just a name, they are different indexes). Would like to change this
2836 * to table-id for consistency.
2839 * Example of how to run the test lookup command:
2840 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2841 * No errors in 2 lookups
2845 VLIB_CLI_COMMAND (lookup_test_command, static) =
2847 .path = "test lookup",
2848 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2849 .function = test_lookup_command_fn,
2854 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2858 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2860 if (~0 == fib_index)
2861 return VNET_API_ERROR_NO_SUCH_FIB;
2863 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2869 static clib_error_t *
2870 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2871 unformat_input_t * input,
2872 vlib_cli_command_t * cmd)
2876 u32 flow_hash_config = 0;
2879 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2881 if (unformat (input, "table %d", &table_id))
2884 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2885 foreach_flow_hash_bit
2892 return clib_error_return (0, "unknown input `%U'",
2893 format_unformat_error, input);
2895 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2901 case VNET_API_ERROR_NO_SUCH_FIB:
2902 return clib_error_return (0, "no such FIB table %d", table_id);
2905 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2913 * Configure the set of IPv4 fields used by the flow hash.
2916 * Example of how to set the flow hash on a given table:
2917 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2918 * Example of display the configured flow hash:
2919 * @cliexstart{show ip fib}
2920 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2923 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2924 * [0] [@0]: dpo-drop ip6
2927 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2928 * [0] [@0]: dpo-drop ip6
2931 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2932 * [0] [@0]: dpo-drop ip6
2935 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2936 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2939 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2940 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2941 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2942 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2943 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2946 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2947 * [0] [@0]: dpo-drop ip6
2948 * 255.255.255.255/32
2950 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2951 * [0] [@0]: dpo-drop ip6
2952 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2955 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2956 * [0] [@0]: dpo-drop ip6
2959 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2960 * [0] [@0]: dpo-drop ip6
2963 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2964 * [0] [@4]: ipv4-glean: af_packet0
2967 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2968 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2971 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2972 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2975 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2976 * [0] [@4]: ipv4-glean: af_packet1
2979 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2980 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2983 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2984 * [0] [@0]: dpo-drop ip6
2987 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2988 * [0] [@0]: dpo-drop ip6
2989 * 255.255.255.255/32
2991 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2992 * [0] [@0]: dpo-drop ip6
2996 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
2998 .path = "set ip flow-hash",
3000 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3001 .function = set_ip_flow_hash_command_fn,
3006 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3009 vnet_main_t *vnm = vnet_get_main ();
3010 vnet_interface_main_t *im = &vnm->interface_main;
3011 ip4_main_t *ipm = &ip4_main;
3012 ip_lookup_main_t *lm = &ipm->lookup_main;
3013 vnet_classify_main_t *cm = &vnet_classify_main;
3014 ip4_address_t *if_addr;
3016 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3017 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3019 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3020 return VNET_API_ERROR_NO_SUCH_ENTRY;
3022 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3023 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3025 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3027 if (NULL != if_addr)
3029 fib_prefix_t pfx = {
3031 .fp_proto = FIB_PROTOCOL_IP4,
3032 .fp_addr.ip4 = *if_addr,
3036 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3040 if (table_index != (u32) ~ 0)
3042 dpo_id_t dpo = DPO_INVALID;
3047 classify_dpo_create (DPO_PROTO_IP4, table_index));
3049 fib_table_entry_special_dpo_add (fib_index,
3051 FIB_SOURCE_CLASSIFY,
3052 FIB_ENTRY_FLAG_NONE, &dpo);
3057 fib_table_entry_special_remove (fib_index,
3058 &pfx, FIB_SOURCE_CLASSIFY);
3065 static clib_error_t *
3066 set_ip_classify_command_fn (vlib_main_t * vm,
3067 unformat_input_t * input,
3068 vlib_cli_command_t * cmd)
3070 u32 table_index = ~0;
3071 int table_index_set = 0;
3072 u32 sw_if_index = ~0;
3075 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3077 if (unformat (input, "table-index %d", &table_index))
3078 table_index_set = 1;
3079 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3080 vnet_get_main (), &sw_if_index))
3086 if (table_index_set == 0)
3087 return clib_error_return (0, "classify table-index must be specified");
3089 if (sw_if_index == ~0)
3090 return clib_error_return (0, "interface / subif must be specified");
3092 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3099 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3100 return clib_error_return (0, "No such interface");
3102 case VNET_API_ERROR_NO_SUCH_ENTRY:
3103 return clib_error_return (0, "No such classifier table");
3109 * Assign a classification table to an interface. The classification
3110 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3111 * commands. Once the table is create, use this command to filter packets
3115 * Example of how to assign a classification table to an interface:
3116 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3119 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3121 .path = "set ip classify",
3123 "set ip classify intfc <interface> table-index <classify-idx>",
3124 .function = set_ip_classify_command_fn,
3129 * fd.io coding-style-patch-verification: ON
3132 * eval: (c-set-style "gnu")