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 /* TODO maybe move to lookup? */
1610 vnet_buffer (p0)->ip.fib_index = fib_index0;
1611 vnet_buffer (p1)->ip.fib_index = fib_index1;
1613 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1614 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1616 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1617 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &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,
1622 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1624 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address,
1627 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1628 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1629 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1631 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1632 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1633 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1635 lb0 = load_balance_get (lbi0);
1636 lb1 = load_balance_get (lbi1);
1637 dpo0 = load_balance_get_bucket_i (lb0, 0);
1638 dpo1 = load_balance_get_bucket_i (lb1, 0);
1641 * Must have a route to source otherwise we drop the packet.
1642 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1645 * - the source is a recieve => it's from us => bogus, do this
1646 * first since it sets a different error code.
1647 * - uRPF check for any route to source - accept if passes.
1648 * - allow packets destined to the broadcast address from unknown sources
1650 if (p0->flags & VNET_BUFFER_F_IS_NATED)
1653 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1654 dpo0->dpoi_type == DPO_RECEIVE) ?
1655 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1656 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1657 !fib_urpf_check_size (lb0->lb_urpf) &&
1658 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1659 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1662 if (p1->flags & VNET_BUFFER_F_IS_NATED)
1665 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1666 dpo1->dpoi_type == DPO_RECEIVE) ?
1667 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1668 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1669 !fib_urpf_check_size (lb1->lb_urpf) &&
1670 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1671 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1675 next0 = lm->local_next_by_ip_protocol[proto0];
1676 next1 = lm->local_next_by_ip_protocol[proto1];
1679 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1681 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1683 p0->error = error0 ? error_node->errors[error0] : 0;
1684 p1->error = error1 ? error_node->errors[error1] : 0;
1686 if (head_of_feature_arc)
1688 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1689 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1690 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1691 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1694 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1695 n_left_to_next, pi0, pi1,
1699 while (n_left_from > 0 && n_left_to_next > 0)
1703 ip4_fib_mtrie_t *mtrie0;
1704 ip4_fib_mtrie_leaf_t leaf0;
1705 u32 pi0, next0, fib_index0, lbi0;
1706 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1707 load_balance_t *lb0;
1708 const dpo_id_t *dpo0;
1711 pi0 = to_next[0] = from[0];
1715 n_left_to_next -= 1;
1717 next0 = IP_LOCAL_NEXT_DROP;
1718 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1720 p0 = vlib_get_buffer (vm, pi0);
1721 ip0 = vlib_buffer_get_current (p0);
1722 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1723 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1725 /* Treat IP frag packets as "experimental" protocol for now
1726 until support of IP frag reassembly is implemented */
1727 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1729 if (head_of_feature_arc == 0 || p0->flags & VNET_BUFFER_F_IS_NATED)
1732 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1733 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1735 (p0->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1737 if (PREDICT_FALSE (ip4_local_do_l4_check (is_tcp_udp0, p0->flags)))
1739 ip4_local_validate_l4 (vm, p0, ip0, is_udp0, &error0,
1743 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1744 error0 = (is_tcp_udp0 && !good_tcp_udp0
1745 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1747 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1749 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1750 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1751 vnet_buffer (p0)->ip.fib_index = fib_index0;
1752 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1753 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1754 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1756 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address,
1758 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1759 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1760 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1762 lb0 = load_balance_get (lbi0);
1763 dpo0 = load_balance_get_bucket_i (lb0, 0);
1765 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1766 dpo0->dpoi_type == DPO_RECEIVE) ?
1767 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1768 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1769 !fib_urpf_check_size (lb0->lb_urpf) &&
1770 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1771 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1774 next0 = lm->local_next_by_ip_protocol[proto0];
1776 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1778 p0->error = error0 ? error_node->errors[error0] : 0;
1780 if (head_of_feature_arc)
1782 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1783 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1786 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1787 n_left_to_next, pi0, next0);
1789 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1792 return frame->n_vectors;
1796 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1798 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1802 VLIB_REGISTER_NODE (ip4_local_node) =
1804 .function = ip4_local,
1805 .name = "ip4-local",
1806 .vector_size = sizeof (u32),
1807 .format_trace = format_ip4_forward_next_trace,
1808 .n_next_nodes = IP_LOCAL_N_NEXT,
1811 [IP_LOCAL_NEXT_DROP] = "ip4-drop",
1812 [IP_LOCAL_NEXT_PUNT] = "ip4-punt",
1813 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1814 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
1819 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1822 ip4_local_end_of_arc (vlib_main_t * vm,
1823 vlib_node_runtime_t * node, vlib_frame_t * frame)
1825 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1829 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1830 .function = ip4_local_end_of_arc,
1831 .name = "ip4-local-end-of-arc",
1832 .vector_size = sizeof (u32),
1834 .format_trace = format_ip4_forward_next_trace,
1835 .sibling_of = "ip4-local",
1838 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1840 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1841 .arc_name = "ip4-local",
1842 .node_name = "ip4-local-end-of-arc",
1843 .runs_before = 0, /* not before any other features */
1848 ip4_register_protocol (u32 protocol, u32 node_index)
1850 vlib_main_t *vm = vlib_get_main ();
1851 ip4_main_t *im = &ip4_main;
1852 ip_lookup_main_t *lm = &im->lookup_main;
1854 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1855 lm->local_next_by_ip_protocol[protocol] =
1856 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1859 static clib_error_t *
1860 show_ip_local_command_fn (vlib_main_t * vm,
1861 unformat_input_t * input, vlib_cli_command_t * cmd)
1863 ip4_main_t *im = &ip4_main;
1864 ip_lookup_main_t *lm = &im->lookup_main;
1867 vlib_cli_output (vm, "Protocols handled by ip4_local");
1868 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1870 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1872 u32 node_index = vlib_get_node (vm,
1873 ip4_local_node.index)->
1874 next_nodes[lm->local_next_by_ip_protocol[i]];
1875 vlib_cli_output (vm, "%d: %U", i, format_vlib_node_name, vm,
1885 * Display the set of protocols handled by the local IPv4 stack.
1888 * Example of how to display local protocol table:
1889 * @cliexstart{show ip local}
1890 * Protocols handled by ip4_local
1897 VLIB_CLI_COMMAND (show_ip_local, static) =
1899 .path = "show ip local",
1900 .function = show_ip_local_command_fn,
1901 .short_help = "show ip local",
1906 ip4_arp_inline (vlib_main_t * vm,
1907 vlib_node_runtime_t * node,
1908 vlib_frame_t * frame, int is_glean)
1910 vnet_main_t *vnm = vnet_get_main ();
1911 ip4_main_t *im = &ip4_main;
1912 ip_lookup_main_t *lm = &im->lookup_main;
1913 u32 *from, *to_next_drop;
1914 uword n_left_from, n_left_to_next_drop, next_index;
1915 static f64 time_last_seed_change = -1e100;
1916 static u32 hash_seeds[3];
1917 static uword hash_bitmap[256 / BITS (uword)];
1920 if (node->flags & VLIB_NODE_FLAG_TRACE)
1921 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1923 time_now = vlib_time_now (vm);
1924 if (time_now - time_last_seed_change > 1e-3)
1927 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
1928 sizeof (hash_seeds));
1929 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1930 hash_seeds[i] = r[i];
1932 /* Mark all hash keys as been no-seen before. */
1933 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1936 time_last_seed_change = time_now;
1939 from = vlib_frame_vector_args (frame);
1940 n_left_from = frame->n_vectors;
1941 next_index = node->cached_next_index;
1942 if (next_index == IP4_ARP_NEXT_DROP)
1943 next_index = IP4_ARP_N_NEXT; /* point to first interface */
1945 while (n_left_from > 0)
1947 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
1948 to_next_drop, n_left_to_next_drop);
1950 while (n_left_from > 0 && n_left_to_next_drop > 0)
1952 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1953 ip_adjacency_t *adj0;
1960 p0 = vlib_get_buffer (vm, pi0);
1962 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1963 adj0 = adj_get (adj_index0);
1964 ip0 = vlib_buffer_get_current (p0);
1970 sw_if_index0 = adj0->rewrite_header.sw_if_index;
1971 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1976 * this is the Glean case, so we are ARPing for the
1977 * packet's destination
1979 a0 ^= ip0->dst_address.data_u32;
1983 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
1987 hash_v3_mix32 (a0, b0, c0);
1988 hash_v3_finalize32 (a0, b0, c0);
1990 c0 &= BITS (hash_bitmap) - 1;
1991 m0 = (uword) 1 << (c0 % BITS (uword));
1992 c0 = c0 / BITS (uword);
1994 bm0 = hash_bitmap[c0];
1995 drop0 = (bm0 & m0) != 0;
1997 /* Mark it as seen. */
1998 hash_bitmap[c0] = bm0 | m0;
2002 to_next_drop[0] = pi0;
2004 n_left_to_next_drop -= 1;
2007 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2008 IP4_ARP_ERROR_REQUEST_SENT];
2011 * the adj has been updated to a rewrite but the node the DPO that got
2012 * us here hasn't - yet. no big deal. we'll drop while we wait.
2014 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2021 * Can happen if the control-plane is programming tables
2022 * with traffic flowing; at least that's today's lame excuse.
2024 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2025 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2027 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2030 /* Send ARP request. */
2034 ethernet_arp_header_t *h0;
2035 vnet_hw_interface_t *hw_if0;
2038 vlib_packet_template_get_packet (vm,
2039 &im->ip4_arp_request_packet_template,
2042 /* Add rewrite/encap string for ARP packet. */
2043 vnet_rewrite_one_header (adj0[0], h0,
2044 sizeof (ethernet_header_t));
2046 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2048 /* Src ethernet address in ARP header. */
2049 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2051 sizeof (h0->ip4_over_ethernet[0].ethernet));
2055 /* The interface's source address is stashed in the Glean Adj */
2056 h0->ip4_over_ethernet[0].ip4 =
2057 adj0->sub_type.glean.receive_addr.ip4;
2059 /* Copy in destination address we are requesting. This is the
2060 * glean case, so it's the packet's destination.*/
2061 h0->ip4_over_ethernet[1].ip4.data_u32 =
2062 ip0->dst_address.data_u32;
2066 /* Src IP address in ARP header. */
2067 if (ip4_src_address_for_packet (lm, sw_if_index0,
2069 ip4_over_ethernet[0].ip4))
2071 /* No source address available */
2073 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2074 vlib_buffer_free (vm, &bi0, 1);
2078 /* Copy in destination address we are requesting from the
2080 h0->ip4_over_ethernet[1].ip4.data_u32 =
2081 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2084 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2085 b0 = vlib_get_buffer (vm, bi0);
2086 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
2087 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2089 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2091 vlib_set_next_frame_buffer (vm, node,
2092 adj0->rewrite_header.next_index,
2097 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2100 return frame->n_vectors;
2104 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2106 return (ip4_arp_inline (vm, node, frame, 0));
2110 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2112 return (ip4_arp_inline (vm, node, frame, 1));
2115 static char *ip4_arp_error_strings[] = {
2116 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2117 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2118 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2119 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2120 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2121 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2124 VLIB_REGISTER_NODE (ip4_arp_node) =
2126 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2127 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2128 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2129 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2131 [IP4_ARP_NEXT_DROP] = "error-drop",}
2134 VLIB_REGISTER_NODE (ip4_glean_node) =
2136 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2137 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2138 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2139 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2141 [IP4_ARP_NEXT_DROP] = "error-drop",}
2144 #define foreach_notrace_ip4_arp_error \
2151 arp_notrace_init (vlib_main_t * vm)
2153 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2155 /* don't trace ARP request packets */
2157 vnet_pcap_drop_trace_filter_add_del \
2158 (rt->errors[IP4_ARP_ERROR_##a], \
2160 foreach_notrace_ip4_arp_error;
2165 VLIB_INIT_FUNCTION (arp_notrace_init);
2168 /* Send an ARP request to see if given destination is reachable on given interface. */
2170 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2172 vnet_main_t *vnm = vnet_get_main ();
2173 ip4_main_t *im = &ip4_main;
2174 ethernet_arp_header_t *h;
2176 ip_interface_address_t *ia;
2177 ip_adjacency_t *adj;
2178 vnet_hw_interface_t *hi;
2179 vnet_sw_interface_t *si;
2184 si = vnet_get_sw_interface (vnm, sw_if_index);
2186 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2188 return clib_error_return (0, "%U: interface %U down",
2189 format_ip4_address, dst,
2190 format_vnet_sw_if_index_name, vnm,
2195 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2198 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2199 return clib_error_return
2201 "no matching interface address for destination %U (interface %U)",
2202 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2206 h = vlib_packet_template_get_packet (vm,
2207 &im->ip4_arp_request_packet_template,
2210 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2211 if (PREDICT_FALSE (!hi->hw_address))
2213 return clib_error_return (0, "%U: interface %U do not support ip probe",
2214 format_ip4_address, dst,
2215 format_vnet_sw_if_index_name, vnm,
2219 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2220 sizeof (h->ip4_over_ethernet[0].ethernet));
2222 h->ip4_over_ethernet[0].ip4 = src[0];
2223 h->ip4_over_ethernet[1].ip4 = dst[0];
2225 b = vlib_get_buffer (vm, bi);
2226 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2227 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2229 ip46_address_t nh = {
2233 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2234 VNET_LINK_IP4, &nh, sw_if_index);
2237 /* Peer has been previously resolved, retrieve glean adj instead */
2238 if (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)
2241 ai = adj_glean_add_or_lock (FIB_PROTOCOL_IP4, sw_if_index, &nh);
2245 /* Add encapsulation string for software interface (e.g. ethernet header). */
2246 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2247 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2250 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2251 u32 *to_next = vlib_frame_vector_args (f);
2254 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2258 return /* no error */ 0;
2263 IP4_REWRITE_NEXT_DROP,
2264 IP4_REWRITE_NEXT_ICMP_ERROR,
2265 } ip4_rewrite_next_t;
2268 ip4_rewrite_inline (vlib_main_t * vm,
2269 vlib_node_runtime_t * node,
2270 vlib_frame_t * frame,
2271 int do_counters, int is_midchain, int is_mcast)
2273 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2274 u32 *from = vlib_frame_vector_args (frame);
2275 u32 n_left_from, n_left_to_next, *to_next, next_index;
2276 vlib_node_runtime_t *error_node =
2277 vlib_node_get_runtime (vm, ip4_input_node.index);
2279 n_left_from = frame->n_vectors;
2280 next_index = node->cached_next_index;
2281 u32 thread_index = vlib_get_thread_index ();
2283 while (n_left_from > 0)
2285 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2287 while (n_left_from >= 4 && n_left_to_next >= 2)
2289 ip_adjacency_t *adj0, *adj1;
2290 vlib_buffer_t *p0, *p1;
2291 ip4_header_t *ip0, *ip1;
2292 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2293 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2294 u32 tx_sw_if_index0, tx_sw_if_index1;
2296 /* Prefetch next iteration. */
2298 vlib_buffer_t *p2, *p3;
2300 p2 = vlib_get_buffer (vm, from[2]);
2301 p3 = vlib_get_buffer (vm, from[3]);
2303 vlib_prefetch_buffer_header (p2, STORE);
2304 vlib_prefetch_buffer_header (p3, STORE);
2306 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2307 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2310 pi0 = to_next[0] = from[0];
2311 pi1 = to_next[1] = from[1];
2316 n_left_to_next -= 2;
2318 p0 = vlib_get_buffer (vm, pi0);
2319 p1 = vlib_get_buffer (vm, pi1);
2321 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2322 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2325 * pre-fetch the per-adjacency counters
2329 vlib_prefetch_combined_counter (&adjacency_counters,
2330 thread_index, adj_index0);
2331 vlib_prefetch_combined_counter (&adjacency_counters,
2332 thread_index, adj_index1);
2335 ip0 = vlib_buffer_get_current (p0);
2336 ip1 = vlib_buffer_get_current (p1);
2338 error0 = error1 = IP4_ERROR_NONE;
2339 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2341 /* Decrement TTL & update checksum.
2342 Works either endian, so no need for byte swap. */
2343 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2345 i32 ttl0 = ip0->ttl;
2347 /* Input node should have reject packets with ttl 0. */
2348 ASSERT (ip0->ttl > 0);
2350 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2351 checksum0 += checksum0 >= 0xffff;
2353 ip0->checksum = checksum0;
2358 * If the ttl drops below 1 when forwarding, generate
2361 if (PREDICT_FALSE (ttl0 <= 0))
2363 error0 = IP4_ERROR_TIME_EXPIRED;
2364 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2365 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2366 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2368 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2371 /* Verify checksum. */
2372 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2373 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2377 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2379 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2381 i32 ttl1 = ip1->ttl;
2383 /* Input node should have reject packets with ttl 0. */
2384 ASSERT (ip1->ttl > 0);
2386 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2387 checksum1 += checksum1 >= 0xffff;
2389 ip1->checksum = checksum1;
2394 * If the ttl drops below 1 when forwarding, generate
2397 if (PREDICT_FALSE (ttl1 <= 0))
2399 error1 = IP4_ERROR_TIME_EXPIRED;
2400 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2401 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2402 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2404 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2407 /* Verify checksum. */
2408 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2409 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2413 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2416 /* Rewrite packet header and updates lengths. */
2417 adj0 = adj_get (adj_index0);
2418 adj1 = adj_get (adj_index1);
2420 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2421 rw_len0 = adj0[0].rewrite_header.data_bytes;
2422 rw_len1 = adj1[0].rewrite_header.data_bytes;
2423 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2424 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2426 /* Check MTU of outgoing interface. */
2428 (vlib_buffer_length_in_chain (vm, p0) >
2430 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2433 (vlib_buffer_length_in_chain (vm, p1) >
2435 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2438 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2439 * to see the IP headerr */
2440 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2442 next0 = adj0[0].rewrite_header.next_index;
2443 p0->current_data -= rw_len0;
2444 p0->current_length += rw_len0;
2445 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2446 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2449 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2450 vnet_feature_arc_start (lm->output_feature_arc_index,
2451 tx_sw_if_index0, &next0, p0);
2453 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2455 next1 = adj1[0].rewrite_header.next_index;
2456 p1->current_data -= rw_len1;
2457 p1->current_length += rw_len1;
2459 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2460 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2463 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2464 vnet_feature_arc_start (lm->output_feature_arc_index,
2465 tx_sw_if_index1, &next1, p1);
2468 /* Guess we are only writing on simple Ethernet header. */
2469 vnet_rewrite_two_headers (adj0[0], adj1[0],
2470 ip0, ip1, sizeof (ethernet_header_t));
2473 * Bump the per-adjacency counters
2477 vlib_increment_combined_counter
2478 (&adjacency_counters,
2481 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2483 vlib_increment_combined_counter
2484 (&adjacency_counters,
2487 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2492 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2493 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2498 * copy bytes from the IP address into the MAC rewrite
2500 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2501 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2504 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2505 to_next, n_left_to_next,
2506 pi0, pi1, next0, next1);
2509 while (n_left_from > 0 && n_left_to_next > 0)
2511 ip_adjacency_t *adj0;
2514 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2515 u32 tx_sw_if_index0;
2517 pi0 = to_next[0] = from[0];
2519 p0 = vlib_get_buffer (vm, pi0);
2521 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2523 adj0 = adj_get (adj_index0);
2525 ip0 = vlib_buffer_get_current (p0);
2527 error0 = IP4_ERROR_NONE;
2528 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2530 /* Decrement TTL & update checksum. */
2531 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2533 i32 ttl0 = ip0->ttl;
2535 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2537 checksum0 += checksum0 >= 0xffff;
2539 ip0->checksum = checksum0;
2541 ASSERT (ip0->ttl > 0);
2547 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2548 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2550 if (PREDICT_FALSE (ttl0 <= 0))
2553 * If the ttl drops below 1 when forwarding, generate
2556 error0 = IP4_ERROR_TIME_EXPIRED;
2557 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2558 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2559 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2560 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2566 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2570 vlib_prefetch_combined_counter (&adjacency_counters,
2571 thread_index, adj_index0);
2573 /* Guess we are only writing on simple Ethernet header. */
2574 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2578 * copy bytes from the IP address into the MAC rewrite
2580 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2583 /* Update packet buffer attributes/set output interface. */
2584 rw_len0 = adj0[0].rewrite_header.data_bytes;
2585 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2588 vlib_increment_combined_counter
2589 (&adjacency_counters,
2590 thread_index, adj_index0, 1,
2591 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2593 /* Check MTU of outgoing interface. */
2594 error0 = (vlib_buffer_length_in_chain (vm, p0)
2595 > adj0[0].rewrite_header.max_l3_packet_bytes
2596 ? IP4_ERROR_MTU_EXCEEDED : error0);
2598 p0->error = error_node->errors[error0];
2600 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2601 * to see the IP headerr */
2602 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2604 p0->current_data -= rw_len0;
2605 p0->current_length += rw_len0;
2606 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2608 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2609 next0 = adj0[0].rewrite_header.next_index;
2613 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2617 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2618 vnet_feature_arc_start (lm->output_feature_arc_index,
2619 tx_sw_if_index0, &next0, p0);
2626 n_left_to_next -= 1;
2628 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2629 to_next, n_left_to_next,
2633 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2636 /* Need to do trace after rewrites to pick up new packet data. */
2637 if (node->flags & VLIB_NODE_FLAG_TRACE)
2638 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2640 return frame->n_vectors;
2644 /** @brief IPv4 rewrite node.
2647 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2648 header checksum, fetch the ip adjacency, check the outbound mtu,
2649 apply the adjacency rewrite, and send pkts to the adjacency
2650 rewrite header's rewrite_next_index.
2652 @param vm vlib_main_t corresponding to the current thread
2653 @param node vlib_node_runtime_t
2654 @param frame vlib_frame_t whose contents should be dispatched
2656 @par Graph mechanics: buffer metadata, next index usage
2659 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2660 - the rewrite adjacency index
2661 - <code>adj->lookup_next_index</code>
2662 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2663 the packet will be dropped.
2664 - <code>adj->rewrite_header</code>
2665 - Rewrite string length, rewrite string, next_index
2668 - <code>b->current_data, b->current_length</code>
2669 - Updated net of applying the rewrite string
2671 <em>Next Indices:</em>
2672 - <code> adj->rewrite_header.next_index </code>
2676 ip4_rewrite (vlib_main_t * vm,
2677 vlib_node_runtime_t * node, vlib_frame_t * frame)
2679 if (adj_are_counters_enabled ())
2680 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2682 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2686 ip4_midchain (vlib_main_t * vm,
2687 vlib_node_runtime_t * node, vlib_frame_t * frame)
2689 if (adj_are_counters_enabled ())
2690 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2692 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2696 ip4_rewrite_mcast (vlib_main_t * vm,
2697 vlib_node_runtime_t * node, vlib_frame_t * frame)
2699 if (adj_are_counters_enabled ())
2700 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2702 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2706 ip4_mcast_midchain (vlib_main_t * vm,
2707 vlib_node_runtime_t * node, vlib_frame_t * frame)
2709 if (adj_are_counters_enabled ())
2710 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2712 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2716 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2717 .function = ip4_rewrite,
2718 .name = "ip4-rewrite",
2719 .vector_size = sizeof (u32),
2721 .format_trace = format_ip4_rewrite_trace,
2725 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2726 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2729 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2731 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2732 .function = ip4_rewrite_mcast,
2733 .name = "ip4-rewrite-mcast",
2734 .vector_size = sizeof (u32),
2736 .format_trace = format_ip4_rewrite_trace,
2737 .sibling_of = "ip4-rewrite",
2739 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2741 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2742 .function = ip4_mcast_midchain,
2743 .name = "ip4-mcast-midchain",
2744 .vector_size = sizeof (u32),
2746 .format_trace = format_ip4_rewrite_trace,
2747 .sibling_of = "ip4-rewrite",
2749 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2751 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2752 .function = ip4_midchain,
2753 .name = "ip4-midchain",
2754 .vector_size = sizeof (u32),
2755 .format_trace = format_ip4_forward_next_trace,
2756 .sibling_of = "ip4-rewrite",
2758 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2762 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2764 ip4_fib_mtrie_t *mtrie0;
2765 ip4_fib_mtrie_leaf_t leaf0;
2768 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2770 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2771 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2772 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2774 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2776 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2779 static clib_error_t *
2780 test_lookup_command_fn (vlib_main_t * vm,
2781 unformat_input_t * input, vlib_cli_command_t * cmd)
2788 ip4_address_t ip4_base_address;
2791 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2793 if (unformat (input, "table %d", &table_id))
2795 /* Make sure the entry exists. */
2796 fib = ip4_fib_get (table_id);
2797 if ((fib) && (fib->index != table_id))
2798 return clib_error_return (0, "<fib-index> %d does not exist",
2801 else if (unformat (input, "count %f", &count))
2804 else if (unformat (input, "%U",
2805 unformat_ip4_address, &ip4_base_address))
2808 return clib_error_return (0, "unknown input `%U'",
2809 format_unformat_error, input);
2814 for (i = 0; i < n; i++)
2816 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2819 ip4_base_address.as_u32 =
2820 clib_host_to_net_u32 (1 +
2821 clib_net_to_host_u32 (ip4_base_address.as_u32));
2825 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2827 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2833 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2834 * given FIB table to determine if there is a conflict with the
2835 * adjacency table. The fib-id can be determined by using the
2836 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2839 * @todo This command uses fib-id, other commands use table-id (not
2840 * just a name, they are different indexes). Would like to change this
2841 * to table-id for consistency.
2844 * Example of how to run the test lookup command:
2845 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2846 * No errors in 2 lookups
2850 VLIB_CLI_COMMAND (lookup_test_command, static) =
2852 .path = "test lookup",
2853 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2854 .function = test_lookup_command_fn,
2859 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2863 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
2865 if (~0 == fib_index)
2866 return VNET_API_ERROR_NO_SUCH_FIB;
2868 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
2874 static clib_error_t *
2875 set_ip_flow_hash_command_fn (vlib_main_t * vm,
2876 unformat_input_t * input,
2877 vlib_cli_command_t * cmd)
2881 u32 flow_hash_config = 0;
2884 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2886 if (unformat (input, "table %d", &table_id))
2889 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2890 foreach_flow_hash_bit
2897 return clib_error_return (0, "unknown input `%U'",
2898 format_unformat_error, input);
2900 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
2906 case VNET_API_ERROR_NO_SUCH_FIB:
2907 return clib_error_return (0, "no such FIB table %d", table_id);
2910 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2918 * Configure the set of IPv4 fields used by the flow hash.
2921 * Example of how to set the flow hash on a given table:
2922 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
2923 * Example of display the configured flow hash:
2924 * @cliexstart{show ip fib}
2925 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2928 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
2929 * [0] [@0]: dpo-drop ip6
2932 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
2933 * [0] [@0]: dpo-drop ip6
2936 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
2937 * [0] [@0]: dpo-drop ip6
2940 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
2941 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2944 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
2945 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2946 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2947 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
2948 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
2951 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
2952 * [0] [@0]: dpo-drop ip6
2953 * 255.255.255.255/32
2955 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
2956 * [0] [@0]: dpo-drop ip6
2957 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
2960 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
2961 * [0] [@0]: dpo-drop ip6
2964 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
2965 * [0] [@0]: dpo-drop ip6
2968 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
2969 * [0] [@4]: ipv4-glean: af_packet0
2972 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
2973 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
2976 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2977 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
2980 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
2981 * [0] [@4]: ipv4-glean: af_packet1
2984 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
2985 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
2988 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
2989 * [0] [@0]: dpo-drop ip6
2992 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
2993 * [0] [@0]: dpo-drop ip6
2994 * 255.255.255.255/32
2996 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
2997 * [0] [@0]: dpo-drop ip6
3001 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3003 .path = "set ip flow-hash",
3005 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3006 .function = set_ip_flow_hash_command_fn,
3011 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3014 vnet_main_t *vnm = vnet_get_main ();
3015 vnet_interface_main_t *im = &vnm->interface_main;
3016 ip4_main_t *ipm = &ip4_main;
3017 ip_lookup_main_t *lm = &ipm->lookup_main;
3018 vnet_classify_main_t *cm = &vnet_classify_main;
3019 ip4_address_t *if_addr;
3021 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3022 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3024 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3025 return VNET_API_ERROR_NO_SUCH_ENTRY;
3027 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3028 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3030 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3032 if (NULL != if_addr)
3034 fib_prefix_t pfx = {
3036 .fp_proto = FIB_PROTOCOL_IP4,
3037 .fp_addr.ip4 = *if_addr,
3041 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3045 if (table_index != (u32) ~ 0)
3047 dpo_id_t dpo = DPO_INVALID;
3052 classify_dpo_create (DPO_PROTO_IP4, table_index));
3054 fib_table_entry_special_dpo_add (fib_index,
3056 FIB_SOURCE_CLASSIFY,
3057 FIB_ENTRY_FLAG_NONE, &dpo);
3062 fib_table_entry_special_remove (fib_index,
3063 &pfx, FIB_SOURCE_CLASSIFY);
3070 static clib_error_t *
3071 set_ip_classify_command_fn (vlib_main_t * vm,
3072 unformat_input_t * input,
3073 vlib_cli_command_t * cmd)
3075 u32 table_index = ~0;
3076 int table_index_set = 0;
3077 u32 sw_if_index = ~0;
3080 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3082 if (unformat (input, "table-index %d", &table_index))
3083 table_index_set = 1;
3084 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3085 vnet_get_main (), &sw_if_index))
3091 if (table_index_set == 0)
3092 return clib_error_return (0, "classify table-index must be specified");
3094 if (sw_if_index == ~0)
3095 return clib_error_return (0, "interface / subif must be specified");
3097 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3104 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3105 return clib_error_return (0, "No such interface");
3107 case VNET_API_ERROR_NO_SUCH_ENTRY:
3108 return clib_error_return (0, "No such classifier table");
3114 * Assign a classification table to an interface. The classification
3115 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3116 * commands. Once the table is create, use this command to filter packets
3120 * Example of how to assign a classification table to an interface:
3121 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3124 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3126 .path = "set ip classify",
3128 "set ip classify intfc <interface> table-index <classify-idx>",
3129 .function = set_ip_classify_command_fn,
3134 * fd.io coding-style-patch-verification: ON
3137 * eval: (c-set-style "gnu")