2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/ip4_forward.c: IP v4 forwarding
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/vnet.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
43 #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
44 #include <vnet/ppp/ppp.h>
45 #include <vnet/srp/srp.h> /* for srp_hw_interface_class */
46 #include <vnet/api_errno.h> /* for API error numbers */
47 #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
48 #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
49 #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */
50 #include <vnet/fib/ip4_fib.h>
51 #include <vnet/dpo/load_balance.h>
52 #include <vnet/dpo/load_balance_map.h>
53 #include <vnet/dpo/classify_dpo.h>
54 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
58 * @brief IPv4 Forwarding.
60 * This file contains the source code for IPv4 forwarding.
64 ip4_forward_next_trace (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
67 vlib_rx_or_tx_t which_adj_index);
70 ip4_lookup_inline (vlib_main_t * vm,
71 vlib_node_runtime_t * node,
73 int lookup_for_responses_to_locally_received_packets)
75 ip4_main_t *im = &ip4_main;
76 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
77 u32 n_left_from, n_left_to_next, *from, *to_next;
78 ip_lookup_next_t next;
79 u32 thread_index = vlib_get_thread_index ();
81 from = vlib_frame_vector_args (frame);
82 n_left_from = frame->n_vectors;
83 next = node->cached_next_index;
85 while (n_left_from > 0)
87 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
89 while (n_left_from >= 8 && n_left_to_next >= 4)
91 vlib_buffer_t *p0, *p1, *p2, *p3;
92 ip4_header_t *ip0, *ip1, *ip2, *ip3;
93 ip_lookup_next_t next0, next1, next2, next3;
94 const load_balance_t *lb0, *lb1, *lb2, *lb3;
95 ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
96 ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
97 ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
98 u32 pi0, fib_index0, lb_index0;
99 u32 pi1, fib_index1, lb_index1;
100 u32 pi2, fib_index2, lb_index2;
101 u32 pi3, fib_index3, lb_index3;
102 flow_hash_config_t flow_hash_config0, flow_hash_config1;
103 flow_hash_config_t flow_hash_config2, flow_hash_config3;
104 u32 hash_c0, hash_c1, hash_c2, hash_c3;
105 const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
107 /* Prefetch next iteration. */
109 vlib_buffer_t *p4, *p5, *p6, *p7;
111 p4 = vlib_get_buffer (vm, from[4]);
112 p5 = vlib_get_buffer (vm, from[5]);
113 p6 = vlib_get_buffer (vm, from[6]);
114 p7 = vlib_get_buffer (vm, from[7]);
116 vlib_prefetch_buffer_header (p4, LOAD);
117 vlib_prefetch_buffer_header (p5, LOAD);
118 vlib_prefetch_buffer_header (p6, LOAD);
119 vlib_prefetch_buffer_header (p7, LOAD);
121 CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
122 CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
123 CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
124 CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
127 pi0 = to_next[0] = from[0];
128 pi1 = to_next[1] = from[1];
129 pi2 = to_next[2] = from[2];
130 pi3 = to_next[3] = from[3];
137 p0 = vlib_get_buffer (vm, pi0);
138 p1 = vlib_get_buffer (vm, pi1);
139 p2 = vlib_get_buffer (vm, pi2);
140 p3 = vlib_get_buffer (vm, pi3);
142 ip0 = vlib_buffer_get_current (p0);
143 ip1 = vlib_buffer_get_current (p1);
144 ip2 = vlib_buffer_get_current (p2);
145 ip3 = vlib_buffer_get_current (p3);
147 dst_addr0 = &ip0->dst_address;
148 dst_addr1 = &ip1->dst_address;
149 dst_addr2 = &ip2->dst_address;
150 dst_addr3 = &ip3->dst_address;
153 vec_elt (im->fib_index_by_sw_if_index,
154 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
156 vec_elt (im->fib_index_by_sw_if_index,
157 vnet_buffer (p1)->sw_if_index[VLIB_RX]);
159 vec_elt (im->fib_index_by_sw_if_index,
160 vnet_buffer (p2)->sw_if_index[VLIB_RX]);
162 vec_elt (im->fib_index_by_sw_if_index,
163 vnet_buffer (p3)->sw_if_index[VLIB_RX]);
165 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
166 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
168 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
169 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
171 (vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
172 (u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
174 (vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
175 (u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
178 if (!lookup_for_responses_to_locally_received_packets)
180 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
181 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
182 mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
183 mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
185 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
186 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
187 leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
188 leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
191 if (!lookup_for_responses_to_locally_received_packets)
193 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
194 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
195 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
196 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
199 if (!lookup_for_responses_to_locally_received_packets)
201 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
202 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
203 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
204 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
207 if (lookup_for_responses_to_locally_received_packets)
209 lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
210 lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
211 lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
212 lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
216 lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
217 lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
218 lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
219 lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
222 ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
223 lb0 = load_balance_get (lb_index0);
224 lb1 = load_balance_get (lb_index1);
225 lb2 = load_balance_get (lb_index2);
226 lb3 = load_balance_get (lb_index3);
228 ASSERT (lb0->lb_n_buckets > 0);
229 ASSERT (is_pow2 (lb0->lb_n_buckets));
230 ASSERT (lb1->lb_n_buckets > 0);
231 ASSERT (is_pow2 (lb1->lb_n_buckets));
232 ASSERT (lb2->lb_n_buckets > 0);
233 ASSERT (is_pow2 (lb2->lb_n_buckets));
234 ASSERT (lb3->lb_n_buckets > 0);
235 ASSERT (is_pow2 (lb3->lb_n_buckets));
237 /* Use flow hash to compute multipath adjacency. */
238 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
239 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
240 hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
241 hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
242 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
244 flow_hash_config0 = lb0->lb_hash_config;
245 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
246 ip4_compute_flow_hash (ip0, flow_hash_config0);
248 load_balance_get_fwd_bucket (lb0,
250 (lb0->lb_n_buckets_minus_1)));
254 dpo0 = load_balance_get_bucket_i (lb0, 0);
256 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
258 flow_hash_config1 = lb1->lb_hash_config;
259 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
260 ip4_compute_flow_hash (ip1, flow_hash_config1);
262 load_balance_get_fwd_bucket (lb1,
264 (lb1->lb_n_buckets_minus_1)));
268 dpo1 = load_balance_get_bucket_i (lb1, 0);
270 if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
272 flow_hash_config2 = lb2->lb_hash_config;
273 hash_c2 = vnet_buffer (p2)->ip.flow_hash =
274 ip4_compute_flow_hash (ip2, flow_hash_config2);
276 load_balance_get_fwd_bucket (lb2,
278 (lb2->lb_n_buckets_minus_1)));
282 dpo2 = load_balance_get_bucket_i (lb2, 0);
284 if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
286 flow_hash_config3 = lb3->lb_hash_config;
287 hash_c3 = vnet_buffer (p3)->ip.flow_hash =
288 ip4_compute_flow_hash (ip3, flow_hash_config3);
290 load_balance_get_fwd_bucket (lb3,
292 (lb3->lb_n_buckets_minus_1)));
296 dpo3 = load_balance_get_bucket_i (lb3, 0);
299 next0 = dpo0->dpoi_next_node;
300 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
301 next1 = dpo1->dpoi_next_node;
302 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
303 next2 = dpo2->dpoi_next_node;
304 vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
305 next3 = dpo3->dpoi_next_node;
306 vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
308 vlib_increment_combined_counter
309 (cm, thread_index, lb_index0, 1,
310 vlib_buffer_length_in_chain (vm, p0));
311 vlib_increment_combined_counter
312 (cm, thread_index, lb_index1, 1,
313 vlib_buffer_length_in_chain (vm, p1));
314 vlib_increment_combined_counter
315 (cm, thread_index, lb_index2, 1,
316 vlib_buffer_length_in_chain (vm, p2));
317 vlib_increment_combined_counter
318 (cm, thread_index, lb_index3, 1,
319 vlib_buffer_length_in_chain (vm, p3));
321 vlib_validate_buffer_enqueue_x4 (vm, node, next,
322 to_next, n_left_to_next,
324 next0, next1, next2, next3);
327 while (n_left_from > 0 && n_left_to_next > 0)
331 ip_lookup_next_t next0;
332 const load_balance_t *lb0;
333 ip4_fib_mtrie_t *mtrie0;
334 ip4_fib_mtrie_leaf_t leaf0;
335 ip4_address_t *dst_addr0;
336 u32 pi0, fib_index0, lbi0;
337 flow_hash_config_t flow_hash_config0;
338 const dpo_id_t *dpo0;
344 p0 = vlib_get_buffer (vm, pi0);
346 ip0 = vlib_buffer_get_current (p0);
348 dst_addr0 = &ip0->dst_address;
351 vec_elt (im->fib_index_by_sw_if_index,
352 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
354 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
355 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
357 if (!lookup_for_responses_to_locally_received_packets)
359 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
361 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
364 if (!lookup_for_responses_to_locally_received_packets)
365 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
367 if (!lookup_for_responses_to_locally_received_packets)
368 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
370 if (lookup_for_responses_to_locally_received_packets)
371 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
374 /* Handle default route. */
375 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
379 lb0 = load_balance_get (lbi0);
381 ASSERT (lb0->lb_n_buckets > 0);
382 ASSERT (is_pow2 (lb0->lb_n_buckets));
384 /* Use flow hash to compute multipath adjacency. */
385 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
386 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
388 flow_hash_config0 = lb0->lb_hash_config;
390 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
391 ip4_compute_flow_hash (ip0, flow_hash_config0);
393 load_balance_get_fwd_bucket (lb0,
395 (lb0->lb_n_buckets_minus_1)));
399 dpo0 = load_balance_get_bucket_i (lb0, 0);
402 next0 = dpo0->dpoi_next_node;
403 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
405 vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
406 vlib_buffer_length_in_chain (vm,
414 if (PREDICT_FALSE (next0 != next))
417 vlib_put_next_frame (vm, node, next, n_left_to_next);
419 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
426 vlib_put_next_frame (vm, node, next, n_left_to_next);
429 if (node->flags & VLIB_NODE_FLAG_TRACE)
430 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
432 return frame->n_vectors;
435 /** @brief IPv4 lookup node.
438 This is the main IPv4 lookup dispatch node.
440 @param vm vlib_main_t corresponding to the current thread
441 @param node vlib_node_runtime_t
442 @param frame vlib_frame_t whose contents should be dispatched
444 @par Graph mechanics: buffer metadata, next index usage
447 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
448 - Indicates the @c sw_if_index value of the interface that the
449 packet was received on.
450 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
451 - When the value is @c ~0 then the node performs a longest prefix
452 match (LPM) for the packet destination address in the FIB attached
453 to the receive interface.
454 - Otherwise perform LPM for the packet destination address in the
455 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
456 value (0, 1, ...) and not a VRF id.
459 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
460 - The lookup result adjacency index.
463 - Dispatches the packet to the node index found in
464 ip_adjacency_t @c adj->lookup_next_index
465 (where @c adj is the lookup result adjacency).
468 ip4_lookup (vlib_main_t * vm,
469 vlib_node_runtime_t * node, vlib_frame_t * frame)
471 return ip4_lookup_inline (vm, node, frame,
472 /* lookup_for_responses_to_locally_received_packets */
477 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
479 VLIB_REGISTER_NODE (ip4_lookup_node) =
481 .function = ip4_lookup,.name = "ip4-lookup",.vector_size =
482 sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
483 IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
485 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
488 ip4_load_balance (vlib_main_t * vm,
489 vlib_node_runtime_t * node, vlib_frame_t * frame)
491 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
492 u32 n_left_from, n_left_to_next, *from, *to_next;
493 ip_lookup_next_t next;
494 u32 thread_index = vlib_get_thread_index ();
496 from = vlib_frame_vector_args (frame);
497 n_left_from = frame->n_vectors;
498 next = node->cached_next_index;
500 if (node->flags & VLIB_NODE_FLAG_TRACE)
501 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
503 while (n_left_from > 0)
505 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
508 while (n_left_from >= 4 && n_left_to_next >= 2)
510 ip_lookup_next_t next0, next1;
511 const load_balance_t *lb0, *lb1;
512 vlib_buffer_t *p0, *p1;
513 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
514 const ip4_header_t *ip0, *ip1;
515 const dpo_id_t *dpo0, *dpo1;
517 /* Prefetch next iteration. */
519 vlib_buffer_t *p2, *p3;
521 p2 = vlib_get_buffer (vm, from[2]);
522 p3 = vlib_get_buffer (vm, from[3]);
524 vlib_prefetch_buffer_header (p2, STORE);
525 vlib_prefetch_buffer_header (p3, STORE);
527 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
528 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
531 pi0 = to_next[0] = from[0];
532 pi1 = to_next[1] = from[1];
539 p0 = vlib_get_buffer (vm, pi0);
540 p1 = vlib_get_buffer (vm, pi1);
542 ip0 = vlib_buffer_get_current (p0);
543 ip1 = vlib_buffer_get_current (p1);
544 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
545 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
547 lb0 = load_balance_get (lbi0);
548 lb1 = load_balance_get (lbi1);
551 * this node is for via FIBs we can re-use the hash value from the
552 * to node if present.
553 * We don't want to use the same hash value at each level in the recursion
554 * graph as that would lead to polarisation
558 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
560 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
562 hc0 = vnet_buffer (p0)->ip.flow_hash =
563 vnet_buffer (p0)->ip.flow_hash >> 1;
567 hc0 = vnet_buffer (p0)->ip.flow_hash =
568 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
570 dpo0 = load_balance_get_fwd_bucket
571 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
575 dpo0 = load_balance_get_bucket_i (lb0, 0);
577 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
579 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
581 hc1 = vnet_buffer (p1)->ip.flow_hash =
582 vnet_buffer (p1)->ip.flow_hash >> 1;
586 hc1 = vnet_buffer (p1)->ip.flow_hash =
587 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
589 dpo1 = load_balance_get_fwd_bucket
590 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
594 dpo1 = load_balance_get_bucket_i (lb1, 0);
597 next0 = dpo0->dpoi_next_node;
598 next1 = dpo1->dpoi_next_node;
600 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
601 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
603 vlib_increment_combined_counter
604 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
605 vlib_increment_combined_counter
606 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
608 vlib_validate_buffer_enqueue_x2 (vm, node, next,
609 to_next, n_left_to_next,
610 pi0, pi1, next0, next1);
613 while (n_left_from > 0 && n_left_to_next > 0)
615 ip_lookup_next_t next0;
616 const load_balance_t *lb0;
619 const ip4_header_t *ip0;
620 const dpo_id_t *dpo0;
629 p0 = vlib_get_buffer (vm, pi0);
631 ip0 = vlib_buffer_get_current (p0);
632 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
634 lb0 = load_balance_get (lbi0);
637 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
639 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
641 hc0 = vnet_buffer (p0)->ip.flow_hash =
642 vnet_buffer (p0)->ip.flow_hash >> 1;
646 hc0 = vnet_buffer (p0)->ip.flow_hash =
647 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
649 dpo0 = load_balance_get_fwd_bucket
650 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
654 dpo0 = load_balance_get_bucket_i (lb0, 0);
657 next0 = dpo0->dpoi_next_node;
658 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
660 vlib_increment_combined_counter
661 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
663 vlib_validate_buffer_enqueue_x1 (vm, node, next,
664 to_next, n_left_to_next,
668 vlib_put_next_frame (vm, node, next, n_left_to_next);
671 return frame->n_vectors;
674 VLIB_REGISTER_NODE (ip4_load_balance_node) =
676 .function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
677 sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
678 format_ip4_lookup_trace,};
680 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
682 /* get first interface address */
684 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
685 ip_interface_address_t ** result_ia)
687 ip_lookup_main_t *lm = &im->lookup_main;
688 ip_interface_address_t *ia = 0;
689 ip4_address_t *result = 0;
692 foreach_ip_interface_address
693 (lm, ia, sw_if_index,
694 1 /* honor unnumbered */ ,
697 ip_interface_address_get_address (lm, ia);
703 *result_ia = result ? ia : 0;
708 ip4_add_interface_routes (u32 sw_if_index,
709 ip4_main_t * im, u32 fib_index,
710 ip_interface_address_t * a)
712 ip_lookup_main_t *lm = &im->lookup_main;
713 ip4_address_t *address = ip_interface_address_get_address (lm, a);
715 .fp_len = a->address_length,
716 .fp_proto = FIB_PROTOCOL_IP4,
717 .fp_addr.ip4 = *address,
720 if (pfx.fp_len <= 30)
722 /* a /30 or shorter - add a glean for the network address */
723 fib_table_entry_update_one_path (fib_index, &pfx,
724 FIB_SOURCE_INTERFACE,
725 (FIB_ENTRY_FLAG_CONNECTED |
726 FIB_ENTRY_FLAG_ATTACHED),
728 /* No next-hop address */
734 // no out-label stack
736 FIB_ROUTE_PATH_FLAG_NONE);
738 /* Add the two broadcast addresses as drop */
739 fib_prefix_t net_pfx = {
741 .fp_proto = FIB_PROTOCOL_IP4,
742 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
744 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
745 fib_table_entry_special_add(fib_index,
747 FIB_SOURCE_INTERFACE,
748 (FIB_ENTRY_FLAG_DROP |
749 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
750 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
751 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
752 fib_table_entry_special_add(fib_index,
754 FIB_SOURCE_INTERFACE,
755 (FIB_ENTRY_FLAG_DROP |
756 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
758 else if (pfx.fp_len == 31)
760 u32 mask = clib_host_to_net_u32(1);
761 fib_prefix_t net_pfx = pfx;
764 net_pfx.fp_addr.ip4.as_u32 ^= mask;
766 /* a /31 - add the other end as an attached host */
767 fib_table_entry_update_one_path (fib_index, &net_pfx,
768 FIB_SOURCE_INTERFACE,
769 (FIB_ENTRY_FLAG_ATTACHED),
777 FIB_ROUTE_PATH_FLAG_NONE);
781 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
783 u32 classify_table_index =
784 lm->classify_table_index_by_sw_if_index[sw_if_index];
785 if (classify_table_index != (u32) ~ 0)
787 dpo_id_t dpo = DPO_INVALID;
792 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
794 fib_table_entry_special_dpo_add (fib_index,
797 FIB_ENTRY_FLAG_NONE, &dpo);
802 fib_table_entry_update_one_path (fib_index, &pfx,
803 FIB_SOURCE_INTERFACE,
804 (FIB_ENTRY_FLAG_CONNECTED |
805 FIB_ENTRY_FLAG_LOCAL),
812 FIB_ROUTE_PATH_FLAG_NONE);
816 ip4_del_interface_routes (ip4_main_t * im,
818 ip4_address_t * address, u32 address_length)
821 .fp_len = address_length,
822 .fp_proto = FIB_PROTOCOL_IP4,
823 .fp_addr.ip4 = *address,
826 if (pfx.fp_len <= 30)
828 fib_prefix_t net_pfx = {
830 .fp_proto = FIB_PROTOCOL_IP4,
831 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
833 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
834 fib_table_entry_special_remove(fib_index,
836 FIB_SOURCE_INTERFACE);
837 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
838 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
839 fib_table_entry_special_remove(fib_index,
841 FIB_SOURCE_INTERFACE);
842 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
844 else if (pfx.fp_len == 31)
846 u32 mask = clib_host_to_net_u32(1);
847 fib_prefix_t net_pfx = pfx;
850 net_pfx.fp_addr.ip4.as_u32 ^= mask;
852 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
856 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
860 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
862 ip4_main_t *im = &ip4_main;
864 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
867 * enable/disable only on the 1<->0 transition
871 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
876 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
877 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
880 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
884 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop",
885 sw_if_index, !is_enable, 0, 0);
888 static clib_error_t *
889 ip4_add_del_interface_address_internal (vlib_main_t * vm,
891 ip4_address_t * address,
892 u32 address_length, u32 is_del)
894 vnet_main_t *vnm = vnet_get_main ();
895 ip4_main_t *im = &ip4_main;
896 ip_lookup_main_t *lm = &im->lookup_main;
897 clib_error_t *error = 0;
898 u32 if_address_index, elts_before;
899 ip4_address_fib_t ip4_af, *addr_fib = 0;
901 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
902 ip4_addr_fib_init (&ip4_af, address,
903 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
904 vec_add1 (addr_fib, ip4_af);
907 * there is no support for adj-fib handling in the presence of overlapping
908 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
914 /* When adding an address check that it does not conflict
915 with an existing address. */
916 ip_interface_address_t *ia;
917 foreach_ip_interface_address
918 (&im->lookup_main, ia, sw_if_index,
919 0 /* honor unnumbered */ ,
922 ip_interface_address_get_address
923 (&im->lookup_main, ia);
924 if (ip4_destination_matches_route
925 (im, address, x, ia->address_length) ||
926 ip4_destination_matches_route (im,
932 ("failed to add %U which conflicts with %U for interface %U",
933 format_ip4_address_and_length, address,
935 format_ip4_address_and_length, x,
937 format_vnet_sw_if_index_name, vnm,
943 elts_before = pool_elts (lm->if_address_pool);
945 error = ip_interface_address_add_del
946 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
950 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
953 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
955 ip4_add_interface_routes (sw_if_index,
956 im, ip4_af.fib_index,
958 (lm->if_address_pool, if_address_index));
960 /* If pool did not grow/shrink: add duplicate address. */
961 if (elts_before != pool_elts (lm->if_address_pool))
963 ip4_add_del_interface_address_callback_t *cb;
964 vec_foreach (cb, im->add_del_interface_address_callbacks)
965 cb->function (im, cb->function_opaque, sw_if_index,
966 address, address_length, if_address_index, is_del);
975 ip4_add_del_interface_address (vlib_main_t * vm,
977 ip4_address_t * address,
978 u32 address_length, u32 is_del)
980 return ip4_add_del_interface_address_internal
981 (vm, sw_if_index, address, address_length, is_del);
984 /* Built-in ip4 unicast rx feature path definition */
986 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
988 .arc_name = "ip4-unicast",
989 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
990 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
993 VNET_FEATURE_INIT (ip4_flow_classify, static) =
995 .arc_name = "ip4-unicast",
996 .node_name = "ip4-flow-classify",
997 .runs_before = VNET_FEATURES ("ip4-inacl"),
1000 VNET_FEATURE_INIT (ip4_inacl, static) =
1002 .arc_name = "ip4-unicast",
1003 .node_name = "ip4-inacl",
1004 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
1007 VNET_FEATURE_INIT (ip4_source_check_1, static) =
1009 .arc_name = "ip4-unicast",
1010 .node_name = "ip4-source-check-via-rx",
1011 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
1014 VNET_FEATURE_INIT (ip4_source_check_2, static) =
1016 .arc_name = "ip4-unicast",
1017 .node_name = "ip4-source-check-via-any",
1018 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1021 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
1023 .arc_name = "ip4-unicast",
1024 .node_name = "ip4-source-and-port-range-check-rx",
1025 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1028 VNET_FEATURE_INIT (ip4_policer_classify, static) =
1030 .arc_name = "ip4-unicast",
1031 .node_name = "ip4-policer-classify",
1032 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1035 VNET_FEATURE_INIT (ip4_ipsec, static) =
1037 .arc_name = "ip4-unicast",
1038 .node_name = "ipsec-input-ip4",
1039 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1042 VNET_FEATURE_INIT (ip4_vpath, static) =
1044 .arc_name = "ip4-unicast",
1045 .node_name = "vpath-input-ip4",
1046 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1049 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1051 .arc_name = "ip4-unicast",
1052 .node_name = "ip4-vxlan-bypass",
1053 .runs_before = VNET_FEATURES ("ip4-lookup"),
1056 VNET_FEATURE_INIT (ip4_drop, static) =
1058 .arc_name = "ip4-unicast",
1059 .node_name = "ip4-drop",
1060 .runs_before = VNET_FEATURES ("ip4-lookup"),
1063 VNET_FEATURE_INIT (ip4_lookup, static) =
1065 .arc_name = "ip4-unicast",
1066 .node_name = "ip4-lookup",
1067 .runs_before = 0, /* not before any other features */
1070 /* Built-in ip4 multicast rx feature path definition */
1071 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1073 .arc_name = "ip4-multicast",
1074 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1075 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1078 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1080 .arc_name = "ip4-multicast",
1081 .node_name = "vpath-input-ip4",
1082 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1085 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1087 .arc_name = "ip4-multicast",
1088 .node_name = "ip4-drop",
1089 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1092 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1094 .arc_name = "ip4-multicast",
1095 .node_name = "ip4-mfib-forward-lookup",
1096 .runs_before = 0, /* last feature */
1099 /* Source and port-range check ip4 tx feature path definition */
1100 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1102 .arc_name = "ip4-output",
1103 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1104 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1107 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1109 .arc_name = "ip4-output",
1110 .node_name = "ip4-source-and-port-range-check-tx",
1111 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1114 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1116 .arc_name = "ip4-output",
1117 .node_name = "ipsec-output-ip4",
1118 .runs_before = VNET_FEATURES ("interface-output"),
1121 /* Built-in ip4 tx feature path definition */
1122 VNET_FEATURE_INIT (ip4_interface_output, static) =
1124 .arc_name = "ip4-output",
1125 .node_name = "interface-output",
1126 .runs_before = 0, /* not before any other features */
1130 static clib_error_t *
1131 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1133 ip4_main_t *im = &ip4_main;
1135 /* Fill in lookup tables with default table (0). */
1136 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1137 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1141 ip4_main_t *im4 = &ip4_main;
1142 ip_lookup_main_t *lm4 = &im4->lookup_main;
1143 ip_interface_address_t *ia = 0;
1144 ip4_address_t *address;
1145 vlib_main_t *vm = vlib_get_main ();
1148 foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* honor unnumbered */,
1150 address = ip_interface_address_get_address (lm4, ia);
1151 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1156 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1159 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1162 return /* no error */ 0;
1165 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1167 /* Global IP4 main. */
1168 ip4_main_t ip4_main;
1171 ip4_lookup_init (vlib_main_t * vm)
1173 ip4_main_t *im = &ip4_main;
1174 clib_error_t *error;
1177 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1180 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1185 m = pow2_mask (i) << (32 - i);
1188 im->fib_masks[i] = clib_host_to_net_u32 (m);
1191 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1193 /* Create FIB with index 0 and table id of 0. */
1194 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1195 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1199 pn = pg_get_node (ip4_lookup_node.index);
1200 pn->unformat_edit = unformat_pg_ip4_header;
1204 ethernet_arp_header_t h;
1206 memset (&h, 0, sizeof (h));
1208 /* Set target ethernet address to all zeros. */
1209 memset (h.ip4_over_ethernet[1].ethernet, 0,
1210 sizeof (h.ip4_over_ethernet[1].ethernet));
1212 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1213 #define _8(f,v) h.f = v;
1214 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1215 _16 (l3_type, ETHERNET_TYPE_IP4);
1216 _8 (n_l2_address_bytes, 6);
1217 _8 (n_l3_address_bytes, 4);
1218 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1222 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1225 /* alloc chunk size */ 8,
1232 VLIB_INIT_FUNCTION (ip4_lookup_init);
1236 /* Adjacency taken. */
1241 /* Packet data, possibly *after* rewrite. */
1242 u8 packet_data[64 - 1 * sizeof (u32)];
1244 ip4_forward_next_trace_t;
1247 format_ip4_forward_next_trace (u8 * s, va_list * args)
1249 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1250 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1251 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1252 uword indent = format_get_indent (s);
1253 s = format (s, "%U%U",
1254 format_white_space, indent,
1255 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1260 format_ip4_lookup_trace (u8 * s, va_list * args)
1262 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1263 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1264 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1265 uword indent = format_get_indent (s);
1267 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1268 t->fib_index, t->dpo_index, t->flow_hash);
1269 s = format (s, "\n%U%U",
1270 format_white_space, indent,
1271 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1276 format_ip4_rewrite_trace (u8 * s, va_list * args)
1278 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1279 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1280 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1281 uword indent = format_get_indent (s);
1283 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1284 t->fib_index, t->dpo_index, format_ip_adjacency,
1285 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1286 s = format (s, "\n%U%U",
1287 format_white_space, indent,
1288 format_ip_adjacency_packet_data,
1289 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1293 /* Common trace function for all ip4-forward next nodes. */
1295 ip4_forward_next_trace (vlib_main_t * vm,
1296 vlib_node_runtime_t * node,
1297 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1300 ip4_main_t *im = &ip4_main;
1302 n_left = frame->n_vectors;
1303 from = vlib_frame_vector_args (frame);
1308 vlib_buffer_t *b0, *b1;
1309 ip4_forward_next_trace_t *t0, *t1;
1311 /* Prefetch next iteration. */
1312 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1313 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1318 b0 = vlib_get_buffer (vm, bi0);
1319 b1 = vlib_get_buffer (vm, bi1);
1321 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1323 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1324 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1325 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1327 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1328 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1329 vec_elt (im->fib_index_by_sw_if_index,
1330 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1332 clib_memcpy (t0->packet_data,
1333 vlib_buffer_get_current (b0),
1334 sizeof (t0->packet_data));
1336 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1338 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1339 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1340 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1342 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1343 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1344 vec_elt (im->fib_index_by_sw_if_index,
1345 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1346 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1347 sizeof (t1->packet_data));
1357 ip4_forward_next_trace_t *t0;
1361 b0 = vlib_get_buffer (vm, bi0);
1363 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1365 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1366 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1367 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1369 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1370 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1371 vec_elt (im->fib_index_by_sw_if_index,
1372 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1373 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1374 sizeof (t0->packet_data));
1382 ip4_drop_or_punt (vlib_main_t * vm,
1383 vlib_node_runtime_t * node,
1384 vlib_frame_t * frame, ip4_error_t error_code)
1386 u32 *buffers = vlib_frame_vector_args (frame);
1387 uword n_packets = frame->n_vectors;
1389 vlib_error_drop_buffers (vm, node, buffers,
1393 ip4_input_node.index, error_code);
1395 if (node->flags & VLIB_NODE_FLAG_TRACE)
1396 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1402 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1404 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1408 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1410 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1414 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1416 .function = ip4_drop,
1418 .vector_size = sizeof (u32),
1419 .format_trace = format_ip4_forward_next_trace,
1426 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1428 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1430 .function = ip4_punt,
1432 .vector_size = sizeof (u32),
1433 .format_trace = format_ip4_forward_next_trace,
1440 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1443 /* Compute TCP/UDP/ICMP4 checksum in software. */
1445 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1449 u32 ip_header_length, payload_length_host_byte_order;
1450 u32 n_this_buffer, n_bytes_left;
1452 void *data_this_buffer;
1454 /* Initialize checksum with ip header. */
1455 ip_header_length = ip4_header_bytes (ip0);
1456 payload_length_host_byte_order =
1457 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1459 clib_host_to_net_u32 (payload_length_host_byte_order +
1460 (ip0->protocol << 16));
1462 if (BITS (uword) == 32)
1465 ip_csum_with_carry (sum0,
1466 clib_mem_unaligned (&ip0->src_address, u32));
1468 ip_csum_with_carry (sum0,
1469 clib_mem_unaligned (&ip0->dst_address, u32));
1473 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1475 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1476 data_this_buffer = (void *) ip0 + ip_header_length;
1477 if (n_this_buffer + ip_header_length > p0->current_length)
1479 p0->current_length >
1480 ip_header_length ? p0->current_length - ip_header_length : 0;
1483 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1484 n_bytes_left -= n_this_buffer;
1485 if (n_bytes_left == 0)
1488 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1489 p0 = vlib_get_buffer (vm, p0->next_buffer);
1490 data_this_buffer = vlib_buffer_get_current (p0);
1491 n_this_buffer = p0->current_length;
1494 sum16 = ~ip_csum_fold (sum0);
1500 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1502 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1506 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1507 || ip0->protocol == IP_PROTOCOL_UDP);
1509 udp0 = (void *) (ip0 + 1);
1510 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1512 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1513 | IP_BUFFER_L4_CHECKSUM_CORRECT);
1517 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1519 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1520 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1526 VNET_FEATURE_ARC_INIT (ip4_local) =
1528 .arc_name = "ip4-local",
1529 .start_nodes = VNET_FEATURES ("ip4-local"),
1534 ip4_local_inline (vlib_main_t * vm,
1535 vlib_node_runtime_t * node,
1536 vlib_frame_t * frame, int head_of_feature_arc)
1538 ip4_main_t *im = &ip4_main;
1539 ip_lookup_main_t *lm = &im->lookup_main;
1540 ip_local_next_t next_index;
1541 u32 *from, *to_next, n_left_from, n_left_to_next;
1542 vlib_node_runtime_t *error_node =
1543 vlib_node_get_runtime (vm, ip4_input_node.index);
1544 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1546 from = vlib_frame_vector_args (frame);
1547 n_left_from = frame->n_vectors;
1548 next_index = node->cached_next_index;
1550 if (node->flags & VLIB_NODE_FLAG_TRACE)
1551 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1553 while (n_left_from > 0)
1555 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1557 while (n_left_from >= 4 && n_left_to_next >= 2)
1559 vlib_buffer_t *p0, *p1;
1560 ip4_header_t *ip0, *ip1;
1561 udp_header_t *udp0, *udp1;
1562 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1563 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1564 const dpo_id_t *dpo0, *dpo1;
1565 const load_balance_t *lb0, *lb1;
1566 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, lbi0;
1567 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, lbi1;
1568 i32 len_diff0, len_diff1;
1569 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1570 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1571 u32 sw_if_index0, sw_if_index1;
1573 pi0 = to_next[0] = from[0];
1574 pi1 = to_next[1] = from[1];
1578 n_left_to_next -= 2;
1580 next0 = next1 = IP_LOCAL_NEXT_DROP;
1582 p0 = vlib_get_buffer (vm, pi0);
1583 p1 = vlib_get_buffer (vm, pi1);
1585 ip0 = vlib_buffer_get_current (p0);
1586 ip1 = vlib_buffer_get_current (p1);
1588 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1589 vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1591 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1592 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1594 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1595 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1597 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1599 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1600 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1602 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1604 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1605 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1607 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1608 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1610 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1611 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1613 /* Treat IP frag packets as "experimental" protocol for now
1614 until support of IP frag reassembly is implemented */
1615 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1616 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1618 if (head_of_feature_arc == 0)
1620 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1624 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1625 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1626 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1627 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1632 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1633 good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1635 udp0 = ip4_next_header (ip0);
1636 udp1 = ip4_next_header (ip1);
1638 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1639 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1640 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1642 /* Verify UDP length. */
1643 ip_len0 = clib_net_to_host_u16 (ip0->length);
1644 ip_len1 = clib_net_to_host_u16 (ip1->length);
1645 udp_len0 = clib_net_to_host_u16 (udp0->length);
1646 udp_len1 = clib_net_to_host_u16 (udp1->length);
1648 len_diff0 = ip_len0 - udp_len0;
1649 len_diff1 = ip_len1 - udp_len1;
1651 len_diff0 = is_udp0 ? len_diff0 : 0;
1652 len_diff1 = is_udp1 ? len_diff1 : 0;
1654 if (PREDICT_FALSE (!(is_tcp_udp0 & is_tcp_udp1
1655 & good_tcp_udp0 & good_tcp_udp1)))
1660 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1661 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1663 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1664 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1669 && !(flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1670 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1672 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1673 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1677 good_tcp_udp0 &= len_diff0 >= 0;
1678 good_tcp_udp1 &= len_diff1 >= 0;
1681 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1683 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1685 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1687 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1688 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1690 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1691 error0 = (is_tcp_udp0 && !good_tcp_udp0
1692 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1693 error1 = (is_tcp_udp1 && !good_tcp_udp1
1694 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1697 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1699 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1701 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1702 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1703 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1705 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1706 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1707 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1709 lb0 = load_balance_get (lbi0);
1710 lb1 = load_balance_get (lbi1);
1711 dpo0 = load_balance_get_bucket_i (lb0, 0);
1712 dpo1 = load_balance_get_bucket_i (lb1, 0);
1715 * Must have a route to source otherwise we drop the packet.
1716 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1719 * - the source is a recieve => it's from us => bogus, do this
1720 * first since it sets a different error code.
1721 * - uRPF check for any route to source - accept if passes.
1722 * - allow packets destined to the broadcast address from unknown sources
1724 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1725 dpo0->dpoi_type == DPO_RECEIVE) ?
1726 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1727 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1728 !fib_urpf_check_size (lb0->lb_urpf) &&
1729 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1730 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1731 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1732 dpo1->dpoi_type == DPO_RECEIVE) ?
1733 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1734 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1735 !fib_urpf_check_size (lb1->lb_urpf) &&
1736 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1737 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1741 next0 = lm->local_next_by_ip_protocol[proto0];
1742 next1 = lm->local_next_by_ip_protocol[proto1];
1745 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1747 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1749 p0->error = error0 ? error_node->errors[error0] : 0;
1750 p1->error = error1 ? error_node->errors[error1] : 0;
1752 if (head_of_feature_arc)
1754 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1755 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1756 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1757 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1760 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1761 n_left_to_next, pi0, pi1,
1765 while (n_left_from > 0 && n_left_to_next > 0)
1770 ip4_fib_mtrie_t *mtrie0;
1771 ip4_fib_mtrie_leaf_t leaf0;
1772 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
1774 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1775 load_balance_t *lb0;
1776 const dpo_id_t *dpo0;
1779 pi0 = to_next[0] = from[0];
1783 n_left_to_next -= 1;
1785 next0 = IP_LOCAL_NEXT_DROP;
1787 p0 = vlib_get_buffer (vm, pi0);
1789 ip0 = vlib_buffer_get_current (p0);
1791 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1793 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1795 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1798 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1799 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1801 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1803 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1805 /* Treat IP frag packets as "experimental" protocol for now
1806 until support of IP frag reassembly is implemented */
1807 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1809 if (head_of_feature_arc == 0)
1811 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1815 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1816 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1820 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1822 udp0 = ip4_next_header (ip0);
1824 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1825 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1827 /* Verify UDP length. */
1828 ip_len0 = clib_net_to_host_u16 (ip0->length);
1829 udp_len0 = clib_net_to_host_u16 (udp0->length);
1831 len_diff0 = ip_len0 - udp_len0;
1833 len_diff0 = is_udp0 ? len_diff0 : 0;
1835 if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
1840 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1841 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1843 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1844 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1848 good_tcp_udp0 &= len_diff0 >= 0;
1851 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1853 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1855 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1857 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1858 error0 = (is_tcp_udp0 && !good_tcp_udp0
1859 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1862 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1864 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1865 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1867 lb0 = load_balance_get (lbi0);
1868 dpo0 = load_balance_get_bucket_i (lb0, 0);
1870 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1871 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1873 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1874 dpo0->dpoi_type == DPO_RECEIVE) ?
1875 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1876 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1877 !fib_urpf_check_size (lb0->lb_urpf) &&
1878 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1879 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1883 next0 = lm->local_next_by_ip_protocol[proto0];
1886 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1888 p0->error = error0 ? error_node->errors[error0] : 0;
1890 if (head_of_feature_arc)
1892 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1893 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1896 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1897 n_left_to_next, pi0, next0);
1901 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1904 return frame->n_vectors;
1908 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1910 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1914 VLIB_REGISTER_NODE (ip4_local_node) =
1916 .function = ip4_local,
1917 .name = "ip4-local",
1918 .vector_size = sizeof (u32),
1919 .format_trace = format_ip4_forward_next_trace,
1920 .n_next_nodes = IP_LOCAL_N_NEXT,
1923 [IP_LOCAL_NEXT_DROP] = "error-drop",
1924 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1925 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1926 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
1930 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1933 ip4_local_end_of_arc (vlib_main_t * vm,
1934 vlib_node_runtime_t * node, vlib_frame_t * frame)
1936 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1940 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1941 .function = ip4_local_end_of_arc,
1942 .name = "ip4-local-end-of-arc",
1943 .vector_size = sizeof (u32),
1945 .format_trace = format_ip4_forward_next_trace,
1946 .sibling_of = "ip4-local",
1949 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1951 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1952 .arc_name = "ip4-local",
1953 .node_name = "ip4-local-end-of-arc",
1954 .runs_before = 0, /* not before any other features */
1959 ip4_register_protocol (u32 protocol, u32 node_index)
1961 vlib_main_t *vm = vlib_get_main ();
1962 ip4_main_t *im = &ip4_main;
1963 ip_lookup_main_t *lm = &im->lookup_main;
1965 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1966 lm->local_next_by_ip_protocol[protocol] =
1967 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1970 static clib_error_t *
1971 show_ip_local_command_fn (vlib_main_t * vm,
1972 unformat_input_t * input, vlib_cli_command_t * cmd)
1974 ip4_main_t *im = &ip4_main;
1975 ip_lookup_main_t *lm = &im->lookup_main;
1978 vlib_cli_output (vm, "Protocols handled by ip4_local");
1979 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1981 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1982 vlib_cli_output (vm, "%d", i);
1990 * Display the set of protocols handled by the local IPv4 stack.
1993 * Example of how to display local protocol table:
1994 * @cliexstart{show ip local}
1995 * Protocols handled by ip4_local
2002 VLIB_CLI_COMMAND (show_ip_local, static) =
2004 .path = "show ip local",
2005 .function = show_ip_local_command_fn,
2006 .short_help = "show ip local",
2011 ip4_arp_inline (vlib_main_t * vm,
2012 vlib_node_runtime_t * node,
2013 vlib_frame_t * frame, int is_glean)
2015 vnet_main_t *vnm = vnet_get_main ();
2016 ip4_main_t *im = &ip4_main;
2017 ip_lookup_main_t *lm = &im->lookup_main;
2018 u32 *from, *to_next_drop;
2019 uword n_left_from, n_left_to_next_drop, next_index;
2020 static f64 time_last_seed_change = -1e100;
2021 static u32 hash_seeds[3];
2022 static uword hash_bitmap[256 / BITS (uword)];
2025 if (node->flags & VLIB_NODE_FLAG_TRACE)
2026 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2028 time_now = vlib_time_now (vm);
2029 if (time_now - time_last_seed_change > 1e-3)
2032 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
2033 sizeof (hash_seeds));
2034 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2035 hash_seeds[i] = r[i];
2037 /* Mark all hash keys as been no-seen before. */
2038 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2041 time_last_seed_change = time_now;
2044 from = vlib_frame_vector_args (frame);
2045 n_left_from = frame->n_vectors;
2046 next_index = node->cached_next_index;
2047 if (next_index == IP4_ARP_NEXT_DROP)
2048 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2050 while (n_left_from > 0)
2052 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2053 to_next_drop, n_left_to_next_drop);
2055 while (n_left_from > 0 && n_left_to_next_drop > 0)
2057 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2058 ip_adjacency_t *adj0;
2065 p0 = vlib_get_buffer (vm, pi0);
2067 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2068 adj0 = adj_get (adj_index0);
2069 ip0 = vlib_buffer_get_current (p0);
2075 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2076 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2081 * this is the Glean case, so we are ARPing for the
2082 * packet's destination
2084 a0 ^= ip0->dst_address.data_u32;
2088 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2092 hash_v3_finalize32 (a0, b0, c0);
2094 c0 &= BITS (hash_bitmap) - 1;
2095 c0 = c0 / BITS (uword);
2096 m0 = (uword) 1 << (c0 % BITS (uword));
2098 bm0 = hash_bitmap[c0];
2099 drop0 = (bm0 & m0) != 0;
2101 /* Mark it as seen. */
2102 hash_bitmap[c0] = bm0 | m0;
2106 to_next_drop[0] = pi0;
2108 n_left_to_next_drop -= 1;
2111 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2112 IP4_ARP_ERROR_REQUEST_SENT];
2115 * the adj has been updated to a rewrite but the node the DPO that got
2116 * us here hasn't - yet. no big deal. we'll drop while we wait.
2118 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2125 * Can happen if the control-plane is programming tables
2126 * with traffic flowing; at least that's today's lame excuse.
2128 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2129 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2131 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2134 /* Send ARP request. */
2138 ethernet_arp_header_t *h0;
2139 vnet_hw_interface_t *hw_if0;
2142 vlib_packet_template_get_packet (vm,
2143 &im->ip4_arp_request_packet_template,
2146 /* Add rewrite/encap string for ARP packet. */
2147 vnet_rewrite_one_header (adj0[0], h0,
2148 sizeof (ethernet_header_t));
2150 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2152 /* Src ethernet address in ARP header. */
2153 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2155 sizeof (h0->ip4_over_ethernet[0].ethernet));
2159 /* The interface's source address is stashed in the Glean Adj */
2160 h0->ip4_over_ethernet[0].ip4 =
2161 adj0->sub_type.glean.receive_addr.ip4;
2163 /* Copy in destination address we are requesting. This is the
2164 * glean case, so it's the packet's destination.*/
2165 h0->ip4_over_ethernet[1].ip4.data_u32 =
2166 ip0->dst_address.data_u32;
2170 /* Src IP address in ARP header. */
2171 if (ip4_src_address_for_packet (lm, sw_if_index0,
2173 ip4_over_ethernet[0].ip4))
2175 /* No source address available */
2177 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2178 vlib_buffer_free (vm, &bi0, 1);
2182 /* Copy in destination address we are requesting from the
2184 h0->ip4_over_ethernet[1].ip4.data_u32 =
2185 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2188 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2189 b0 = vlib_get_buffer (vm, bi0);
2190 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2192 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2194 vlib_set_next_frame_buffer (vm, node,
2195 adj0->rewrite_header.next_index,
2200 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2203 return frame->n_vectors;
2207 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2209 return (ip4_arp_inline (vm, node, frame, 0));
2213 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2215 return (ip4_arp_inline (vm, node, frame, 1));
2218 static char *ip4_arp_error_strings[] = {
2219 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2220 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2221 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2222 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2223 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2224 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2227 VLIB_REGISTER_NODE (ip4_arp_node) =
2229 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2230 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2231 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2232 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2234 [IP4_ARP_NEXT_DROP] = "error-drop",}
2237 VLIB_REGISTER_NODE (ip4_glean_node) =
2239 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2240 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2241 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2242 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2244 [IP4_ARP_NEXT_DROP] = "error-drop",}
2247 #define foreach_notrace_ip4_arp_error \
2254 arp_notrace_init (vlib_main_t * vm)
2256 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2258 /* don't trace ARP request packets */
2260 vnet_pcap_drop_trace_filter_add_del \
2261 (rt->errors[IP4_ARP_ERROR_##a], \
2263 foreach_notrace_ip4_arp_error;
2268 VLIB_INIT_FUNCTION (arp_notrace_init);
2271 /* Send an ARP request to see if given destination is reachable on given interface. */
2273 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2275 vnet_main_t *vnm = vnet_get_main ();
2276 ip4_main_t *im = &ip4_main;
2277 ethernet_arp_header_t *h;
2279 ip_interface_address_t *ia;
2280 ip_adjacency_t *adj;
2281 vnet_hw_interface_t *hi;
2282 vnet_sw_interface_t *si;
2287 si = vnet_get_sw_interface (vnm, sw_if_index);
2289 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2291 return clib_error_return (0, "%U: interface %U down",
2292 format_ip4_address, dst,
2293 format_vnet_sw_if_index_name, vnm,
2298 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2301 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2302 return clib_error_return
2304 "no matching interface address for destination %U (interface %U)",
2305 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2309 ip46_address_t nh = {
2313 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2314 VNET_LINK_IP4, &nh, sw_if_index);
2317 h = vlib_packet_template_get_packet (vm,
2318 &im->ip4_arp_request_packet_template,
2321 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2323 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2324 sizeof (h->ip4_over_ethernet[0].ethernet));
2326 h->ip4_over_ethernet[0].ip4 = src[0];
2327 h->ip4_over_ethernet[1].ip4 = dst[0];
2329 b = vlib_get_buffer (vm, bi);
2330 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2331 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2333 /* Add encapsulation string for software interface (e.g. ethernet header). */
2334 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2335 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2338 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2339 u32 *to_next = vlib_frame_vector_args (f);
2342 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2346 return /* no error */ 0;
2351 IP4_REWRITE_NEXT_DROP,
2352 IP4_REWRITE_NEXT_ICMP_ERROR,
2353 } ip4_rewrite_next_t;
2356 ip4_rewrite_inline (vlib_main_t * vm,
2357 vlib_node_runtime_t * node,
2358 vlib_frame_t * frame,
2359 int do_counters, int is_midchain, int is_mcast)
2361 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2362 u32 *from = vlib_frame_vector_args (frame);
2363 u32 n_left_from, n_left_to_next, *to_next, next_index;
2364 vlib_node_runtime_t *error_node =
2365 vlib_node_get_runtime (vm, ip4_input_node.index);
2367 n_left_from = frame->n_vectors;
2368 next_index = node->cached_next_index;
2369 u32 thread_index = vlib_get_thread_index ();
2371 while (n_left_from > 0)
2373 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2375 while (n_left_from >= 4 && n_left_to_next >= 2)
2377 ip_adjacency_t *adj0, *adj1;
2378 vlib_buffer_t *p0, *p1;
2379 ip4_header_t *ip0, *ip1;
2380 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2381 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2382 u32 tx_sw_if_index0, tx_sw_if_index1;
2384 /* Prefetch next iteration. */
2386 vlib_buffer_t *p2, *p3;
2388 p2 = vlib_get_buffer (vm, from[2]);
2389 p3 = vlib_get_buffer (vm, from[3]);
2391 vlib_prefetch_buffer_header (p2, STORE);
2392 vlib_prefetch_buffer_header (p3, STORE);
2394 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2395 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2398 pi0 = to_next[0] = from[0];
2399 pi1 = to_next[1] = from[1];
2404 n_left_to_next -= 2;
2406 p0 = vlib_get_buffer (vm, pi0);
2407 p1 = vlib_get_buffer (vm, pi1);
2409 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2410 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2413 * pre-fetch the per-adjacency counters
2417 vlib_prefetch_combined_counter (&adjacency_counters,
2418 thread_index, adj_index0);
2419 vlib_prefetch_combined_counter (&adjacency_counters,
2420 thread_index, adj_index1);
2423 ip0 = vlib_buffer_get_current (p0);
2424 ip1 = vlib_buffer_get_current (p1);
2426 error0 = error1 = IP4_ERROR_NONE;
2427 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2429 /* Decrement TTL & update checksum.
2430 Works either endian, so no need for byte swap. */
2431 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2433 i32 ttl0 = ip0->ttl;
2435 /* Input node should have reject packets with ttl 0. */
2436 ASSERT (ip0->ttl > 0);
2438 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2439 checksum0 += checksum0 >= 0xffff;
2441 ip0->checksum = checksum0;
2446 * If the ttl drops below 1 when forwarding, generate
2449 if (PREDICT_FALSE (ttl0 <= 0))
2451 error0 = IP4_ERROR_TIME_EXPIRED;
2452 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2453 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2454 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2456 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2459 /* Verify checksum. */
2460 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2464 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2466 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2468 i32 ttl1 = ip1->ttl;
2470 /* Input node should have reject packets with ttl 0. */
2471 ASSERT (ip1->ttl > 0);
2473 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2474 checksum1 += checksum1 >= 0xffff;
2476 ip1->checksum = checksum1;
2481 * If the ttl drops below 1 when forwarding, generate
2484 if (PREDICT_FALSE (ttl1 <= 0))
2486 error1 = IP4_ERROR_TIME_EXPIRED;
2487 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2488 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2489 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2491 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2494 /* Verify checksum. */
2495 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2499 p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2502 /* Rewrite packet header and updates lengths. */
2503 adj0 = adj_get (adj_index0);
2504 adj1 = adj_get (adj_index1);
2506 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2507 rw_len0 = adj0[0].rewrite_header.data_bytes;
2508 rw_len1 = adj1[0].rewrite_header.data_bytes;
2509 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2510 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2512 /* Check MTU of outgoing interface. */
2514 (vlib_buffer_length_in_chain (vm, p0) >
2516 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2519 (vlib_buffer_length_in_chain (vm, p1) >
2521 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2524 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2525 * to see the IP headerr */
2526 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2528 next0 = adj0[0].rewrite_header.next_index;
2529 p0->current_data -= rw_len0;
2530 p0->current_length += rw_len0;
2531 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2532 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2535 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2536 vnet_feature_arc_start (lm->output_feature_arc_index,
2537 tx_sw_if_index0, &next0, p0);
2539 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2541 next1 = adj1[0].rewrite_header.next_index;
2542 p1->current_data -= rw_len1;
2543 p1->current_length += rw_len1;
2545 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2546 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2549 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2550 vnet_feature_arc_start (lm->output_feature_arc_index,
2551 tx_sw_if_index1, &next1, p1);
2554 /* Guess we are only writing on simple Ethernet header. */
2555 vnet_rewrite_two_headers (adj0[0], adj1[0],
2556 ip0, ip1, sizeof (ethernet_header_t));
2559 * Bump the per-adjacency counters
2563 vlib_increment_combined_counter
2564 (&adjacency_counters,
2567 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2569 vlib_increment_combined_counter
2570 (&adjacency_counters,
2573 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2578 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2579 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2584 * copy bytes from the IP address into the MAC rewrite
2586 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2587 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2590 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2591 to_next, n_left_to_next,
2592 pi0, pi1, next0, next1);
2595 while (n_left_from > 0 && n_left_to_next > 0)
2597 ip_adjacency_t *adj0;
2600 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2601 u32 tx_sw_if_index0;
2603 pi0 = to_next[0] = from[0];
2605 p0 = vlib_get_buffer (vm, pi0);
2607 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2609 adj0 = adj_get (adj_index0);
2611 ip0 = vlib_buffer_get_current (p0);
2613 error0 = IP4_ERROR_NONE;
2614 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2616 /* Decrement TTL & update checksum. */
2617 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2619 i32 ttl0 = ip0->ttl;
2621 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2623 checksum0 += checksum0 >= 0xffff;
2625 ip0->checksum = checksum0;
2627 ASSERT (ip0->ttl > 0);
2633 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2635 if (PREDICT_FALSE (ttl0 <= 0))
2638 * If the ttl drops below 1 when forwarding, generate
2641 error0 = IP4_ERROR_TIME_EXPIRED;
2642 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2643 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2644 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2645 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2651 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2655 vlib_prefetch_combined_counter (&adjacency_counters,
2656 thread_index, adj_index0);
2658 /* Guess we are only writing on simple Ethernet header. */
2659 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2663 * copy bytes from the IP address into the MAC rewrite
2665 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2668 /* Update packet buffer attributes/set output interface. */
2669 rw_len0 = adj0[0].rewrite_header.data_bytes;
2670 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2673 vlib_increment_combined_counter
2674 (&adjacency_counters,
2675 thread_index, adj_index0, 1,
2676 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2678 /* Check MTU of outgoing interface. */
2679 error0 = (vlib_buffer_length_in_chain (vm, p0)
2680 > adj0[0].rewrite_header.max_l3_packet_bytes
2681 ? IP4_ERROR_MTU_EXCEEDED : error0);
2683 p0->error = error_node->errors[error0];
2685 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2686 * to see the IP headerr */
2687 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2689 p0->current_data -= rw_len0;
2690 p0->current_length += rw_len0;
2691 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2693 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2694 next0 = adj0[0].rewrite_header.next_index;
2698 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2702 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2703 vnet_feature_arc_start (lm->output_feature_arc_index,
2704 tx_sw_if_index0, &next0, p0);
2711 n_left_to_next -= 1;
2713 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2714 to_next, n_left_to_next,
2718 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2721 /* Need to do trace after rewrites to pick up new packet data. */
2722 if (node->flags & VLIB_NODE_FLAG_TRACE)
2723 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2725 return frame->n_vectors;
2729 /** @brief IPv4 rewrite node.
2732 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2733 header checksum, fetch the ip adjacency, check the outbound mtu,
2734 apply the adjacency rewrite, and send pkts to the adjacency
2735 rewrite header's rewrite_next_index.
2737 @param vm vlib_main_t corresponding to the current thread
2738 @param node vlib_node_runtime_t
2739 @param frame vlib_frame_t whose contents should be dispatched
2741 @par Graph mechanics: buffer metadata, next index usage
2744 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2745 - the rewrite adjacency index
2746 - <code>adj->lookup_next_index</code>
2747 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2748 the packet will be dropped.
2749 - <code>adj->rewrite_header</code>
2750 - Rewrite string length, rewrite string, next_index
2753 - <code>b->current_data, b->current_length</code>
2754 - Updated net of applying the rewrite string
2756 <em>Next Indices:</em>
2757 - <code> adj->rewrite_header.next_index </code>
2761 ip4_rewrite (vlib_main_t * vm,
2762 vlib_node_runtime_t * node, vlib_frame_t * frame)
2764 if (adj_are_counters_enabled ())
2765 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2767 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2771 ip4_midchain (vlib_main_t * vm,
2772 vlib_node_runtime_t * node, vlib_frame_t * frame)
2774 if (adj_are_counters_enabled ())
2775 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2777 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2781 ip4_rewrite_mcast (vlib_main_t * vm,
2782 vlib_node_runtime_t * node, vlib_frame_t * frame)
2784 if (adj_are_counters_enabled ())
2785 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2787 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2791 ip4_mcast_midchain (vlib_main_t * vm,
2792 vlib_node_runtime_t * node, vlib_frame_t * frame)
2794 if (adj_are_counters_enabled ())
2795 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2797 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2801 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2802 .function = ip4_rewrite,
2803 .name = "ip4-rewrite",
2804 .vector_size = sizeof (u32),
2806 .format_trace = format_ip4_rewrite_trace,
2810 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2811 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2814 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2816 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2817 .function = ip4_rewrite_mcast,
2818 .name = "ip4-rewrite-mcast",
2819 .vector_size = sizeof (u32),
2821 .format_trace = format_ip4_rewrite_trace,
2822 .sibling_of = "ip4-rewrite",
2824 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2826 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2827 .function = ip4_mcast_midchain,
2828 .name = "ip4-mcast-midchain",
2829 .vector_size = sizeof (u32),
2831 .format_trace = format_ip4_rewrite_trace,
2832 .sibling_of = "ip4-rewrite",
2834 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2836 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2837 .function = ip4_midchain,
2838 .name = "ip4-midchain",
2839 .vector_size = sizeof (u32),
2840 .format_trace = format_ip4_forward_next_trace,
2841 .sibling_of = "ip4-rewrite",
2843 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2846 static clib_error_t *
2847 add_del_interface_table (vlib_main_t * vm,
2848 unformat_input_t * input, vlib_cli_command_t * cmd)
2850 vnet_main_t *vnm = vnet_get_main ();
2851 ip_interface_address_t *ia;
2852 clib_error_t *error = 0;
2853 u32 sw_if_index, table_id;
2857 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2859 error = clib_error_return (0, "unknown interface `%U'",
2860 format_unformat_error, input);
2864 if (unformat (input, "%d", &table_id))
2868 error = clib_error_return (0, "expected table id `%U'",
2869 format_unformat_error, input);
2874 * If the interface already has in IP address, then a change int
2875 * VRF is not allowed. The IP address applied must first be removed.
2876 * We do not do that automatically here, since VPP has no knowledge
2877 * of whether thoses subnets are valid in the destination VRF.
2880 foreach_ip_interface_address (&ip4_main.lookup_main,
2882 1 /* honor unnumbered */,
2886 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2887 error = clib_error_return (0, "interface %U has address %U",
2888 format_vnet_sw_if_index_name, vnm,
2890 format_ip4_address, a);
2896 ip4_main_t *im = &ip4_main;
2899 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2901 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2902 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2904 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2905 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2906 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2914 * Place the indicated interface into the supplied IPv4 FIB table (also known
2915 * as a VRF). If the FIB table does not exist, this command creates it. To
2916 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2917 * FIB table will only be displayed if a route has been added to the table, or
2918 * an IP Address is assigned to an interface in the table (which adds a route
2921 * @note IP addresses added after setting the interface IP table are added to
2922 * the indicated FIB table. If an IP address is added prior to changing the
2923 * table then this is an error. The control plane must remove these addresses
2924 * first and then change the table. VPP will not automatically move the
2925 * addresses from the old to the new table as it does not know the validity
2929 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2930 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2933 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2935 .path = "set interface ip table",
2936 .function = add_del_interface_table,
2937 .short_help = "set interface ip table <interface> <table-id>",
2942 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2944 ip4_fib_mtrie_t *mtrie0;
2945 ip4_fib_mtrie_leaf_t leaf0;
2948 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2950 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2951 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2952 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2954 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2956 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2959 static clib_error_t *
2960 test_lookup_command_fn (vlib_main_t * vm,
2961 unformat_input_t * input, vlib_cli_command_t * cmd)
2968 ip4_address_t ip4_base_address;
2971 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2973 if (unformat (input, "table %d", &table_id))
2975 /* Make sure the entry exists. */
2976 fib = ip4_fib_get (table_id);
2977 if ((fib) && (fib->index != table_id))
2978 return clib_error_return (0, "<fib-index> %d does not exist",
2981 else if (unformat (input, "count %f", &count))
2984 else if (unformat (input, "%U",
2985 unformat_ip4_address, &ip4_base_address))
2988 return clib_error_return (0, "unknown input `%U'",
2989 format_unformat_error, input);
2994 for (i = 0; i < n; i++)
2996 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2999 ip4_base_address.as_u32 =
3000 clib_host_to_net_u32 (1 +
3001 clib_net_to_host_u32 (ip4_base_address.as_u32));
3005 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
3007 vlib_cli_output (vm, "No errors in %d lookups\n", n);
3013 * Perform a lookup of an IPv4 Address (or range of addresses) in the
3014 * given FIB table to determine if there is a conflict with the
3015 * adjacency table. The fib-id can be determined by using the
3016 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
3019 * @todo This command uses fib-id, other commands use table-id (not
3020 * just a name, they are different indexes). Would like to change this
3021 * to table-id for consistency.
3024 * Example of how to run the test lookup command:
3025 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
3026 * No errors in 2 lookups
3030 VLIB_CLI_COMMAND (lookup_test_command, static) =
3032 .path = "test lookup",
3033 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
3034 .function = test_lookup_command_fn,
3039 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
3043 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
3045 if (~0 == fib_index)
3046 return VNET_API_ERROR_NO_SUCH_FIB;
3048 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
3054 static clib_error_t *
3055 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3056 unformat_input_t * input,
3057 vlib_cli_command_t * cmd)
3061 u32 flow_hash_config = 0;
3064 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3066 if (unformat (input, "table %d", &table_id))
3069 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3070 foreach_flow_hash_bit
3077 return clib_error_return (0, "unknown input `%U'",
3078 format_unformat_error, input);
3080 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3086 case VNET_API_ERROR_NO_SUCH_FIB:
3087 return clib_error_return (0, "no such FIB table %d", table_id);
3090 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3098 * Configure the set of IPv4 fields used by the flow hash.
3101 * Example of how to set the flow hash on a given table:
3102 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3103 * Example of display the configured flow hash:
3104 * @cliexstart{show ip fib}
3105 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3108 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3109 * [0] [@0]: dpo-drop ip6
3112 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3113 * [0] [@0]: dpo-drop ip6
3116 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3117 * [0] [@0]: dpo-drop ip6
3120 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3121 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3124 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3125 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3126 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3127 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3128 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3131 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3132 * [0] [@0]: dpo-drop ip6
3133 * 255.255.255.255/32
3135 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3136 * [0] [@0]: dpo-drop ip6
3137 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3140 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3141 * [0] [@0]: dpo-drop ip6
3144 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3145 * [0] [@0]: dpo-drop ip6
3148 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3149 * [0] [@4]: ipv4-glean: af_packet0
3152 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3153 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3156 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3157 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3160 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3161 * [0] [@4]: ipv4-glean: af_packet1
3164 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3165 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3168 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3169 * [0] [@0]: dpo-drop ip6
3172 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3173 * [0] [@0]: dpo-drop ip6
3174 * 255.255.255.255/32
3176 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3177 * [0] [@0]: dpo-drop ip6
3181 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3183 .path = "set ip flow-hash",
3185 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3186 .function = set_ip_flow_hash_command_fn,
3191 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3194 vnet_main_t *vnm = vnet_get_main ();
3195 vnet_interface_main_t *im = &vnm->interface_main;
3196 ip4_main_t *ipm = &ip4_main;
3197 ip_lookup_main_t *lm = &ipm->lookup_main;
3198 vnet_classify_main_t *cm = &vnet_classify_main;
3199 ip4_address_t *if_addr;
3201 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3202 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3204 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3205 return VNET_API_ERROR_NO_SUCH_ENTRY;
3207 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3208 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3210 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3212 if (NULL != if_addr)
3214 fib_prefix_t pfx = {
3216 .fp_proto = FIB_PROTOCOL_IP4,
3217 .fp_addr.ip4 = *if_addr,
3221 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3225 if (table_index != (u32) ~ 0)
3227 dpo_id_t dpo = DPO_INVALID;
3232 classify_dpo_create (DPO_PROTO_IP4, table_index));
3234 fib_table_entry_special_dpo_add (fib_index,
3236 FIB_SOURCE_CLASSIFY,
3237 FIB_ENTRY_FLAG_NONE, &dpo);
3242 fib_table_entry_special_remove (fib_index,
3243 &pfx, FIB_SOURCE_CLASSIFY);
3250 static clib_error_t *
3251 set_ip_classify_command_fn (vlib_main_t * vm,
3252 unformat_input_t * input,
3253 vlib_cli_command_t * cmd)
3255 u32 table_index = ~0;
3256 int table_index_set = 0;
3257 u32 sw_if_index = ~0;
3260 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3262 if (unformat (input, "table-index %d", &table_index))
3263 table_index_set = 1;
3264 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3265 vnet_get_main (), &sw_if_index))
3271 if (table_index_set == 0)
3272 return clib_error_return (0, "classify table-index must be specified");
3274 if (sw_if_index == ~0)
3275 return clib_error_return (0, "interface / subif must be specified");
3277 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3284 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3285 return clib_error_return (0, "No such interface");
3287 case VNET_API_ERROR_NO_SUCH_ENTRY:
3288 return clib_error_return (0, "No such classifier table");
3294 * Assign a classification table to an interface. The classification
3295 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3296 * commands. Once the table is create, use this command to filter packets
3300 * Example of how to assign a classification table to an interface:
3301 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3304 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3306 .path = "set ip classify",
3308 "set ip classify intfc <interface> table-index <classify-idx>",
3309 .function = set_ip_classify_command_fn,
3314 * fd.io coding-style-patch-verification: ON
3317 * eval: (c-set-style "gnu")