2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/ip4_forward.c: IP v4 forwarding
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/vnet.h>
41 #include <vnet/ip/ip.h>
42 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
43 #include <vnet/ethernet/arp_packet.h> /* for ethernet_arp_header_t */
44 #include <vnet/ppp/ppp.h>
45 #include <vnet/srp/srp.h> /* for srp_hw_interface_class */
46 #include <vnet/api_errno.h> /* for API error numbers */
47 #include <vnet/fib/fib_table.h> /* for FIB table and entry creation */
48 #include <vnet/fib/fib_entry.h> /* for FIB table and entry creation */
49 #include <vnet/fib/fib_urpf_list.h> /* for FIB uRPF check */
50 #include <vnet/fib/ip4_fib.h>
51 #include <vnet/dpo/load_balance.h>
52 #include <vnet/dpo/load_balance_map.h>
53 #include <vnet/dpo/classify_dpo.h>
54 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
58 * @brief IPv4 Forwarding.
60 * This file contains the source code for IPv4 forwarding.
64 ip4_forward_next_trace (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
67 vlib_rx_or_tx_t which_adj_index);
70 ip4_lookup_inline (vlib_main_t * vm,
71 vlib_node_runtime_t * node,
73 int lookup_for_responses_to_locally_received_packets)
75 ip4_main_t *im = &ip4_main;
76 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
77 u32 n_left_from, n_left_to_next, *from, *to_next;
78 ip_lookup_next_t next;
79 u32 thread_index = vlib_get_thread_index ();
81 from = vlib_frame_vector_args (frame);
82 n_left_from = frame->n_vectors;
83 next = node->cached_next_index;
85 while (n_left_from > 0)
87 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
89 while (n_left_from >= 8 && n_left_to_next >= 4)
91 vlib_buffer_t *p0, *p1, *p2, *p3;
92 ip4_header_t *ip0, *ip1, *ip2, *ip3;
93 ip_lookup_next_t next0, next1, next2, next3;
94 const load_balance_t *lb0, *lb1, *lb2, *lb3;
95 ip4_fib_mtrie_t *mtrie0, *mtrie1, *mtrie2, *mtrie3;
96 ip4_fib_mtrie_leaf_t leaf0, leaf1, leaf2, leaf3;
97 ip4_address_t *dst_addr0, *dst_addr1, *dst_addr2, *dst_addr3;
98 u32 pi0, fib_index0, lb_index0;
99 u32 pi1, fib_index1, lb_index1;
100 u32 pi2, fib_index2, lb_index2;
101 u32 pi3, fib_index3, lb_index3;
102 flow_hash_config_t flow_hash_config0, flow_hash_config1;
103 flow_hash_config_t flow_hash_config2, flow_hash_config3;
104 u32 hash_c0, hash_c1, hash_c2, hash_c3;
105 const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
107 /* Prefetch next iteration. */
109 vlib_buffer_t *p4, *p5, *p6, *p7;
111 p4 = vlib_get_buffer (vm, from[4]);
112 p5 = vlib_get_buffer (vm, from[5]);
113 p6 = vlib_get_buffer (vm, from[6]);
114 p7 = vlib_get_buffer (vm, from[7]);
116 vlib_prefetch_buffer_header (p4, LOAD);
117 vlib_prefetch_buffer_header (p5, LOAD);
118 vlib_prefetch_buffer_header (p6, LOAD);
119 vlib_prefetch_buffer_header (p7, LOAD);
121 CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
122 CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
123 CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
124 CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
127 pi0 = to_next[0] = from[0];
128 pi1 = to_next[1] = from[1];
129 pi2 = to_next[2] = from[2];
130 pi3 = to_next[3] = from[3];
137 p0 = vlib_get_buffer (vm, pi0);
138 p1 = vlib_get_buffer (vm, pi1);
139 p2 = vlib_get_buffer (vm, pi2);
140 p3 = vlib_get_buffer (vm, pi3);
142 ip0 = vlib_buffer_get_current (p0);
143 ip1 = vlib_buffer_get_current (p1);
144 ip2 = vlib_buffer_get_current (p2);
145 ip3 = vlib_buffer_get_current (p3);
147 dst_addr0 = &ip0->dst_address;
148 dst_addr1 = &ip1->dst_address;
149 dst_addr2 = &ip2->dst_address;
150 dst_addr3 = &ip3->dst_address;
153 vec_elt (im->fib_index_by_sw_if_index,
154 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
156 vec_elt (im->fib_index_by_sw_if_index,
157 vnet_buffer (p1)->sw_if_index[VLIB_RX]);
159 vec_elt (im->fib_index_by_sw_if_index,
160 vnet_buffer (p2)->sw_if_index[VLIB_RX]);
162 vec_elt (im->fib_index_by_sw_if_index,
163 vnet_buffer (p3)->sw_if_index[VLIB_RX]);
165 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
166 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
168 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
169 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
171 (vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
172 (u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
174 (vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
175 (u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
178 if (!lookup_for_responses_to_locally_received_packets)
180 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
181 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
182 mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
183 mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
185 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
186 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
187 leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
188 leaf3 = ip4_fib_mtrie_lookup_step_one (mtrie3, dst_addr3);
191 if (!lookup_for_responses_to_locally_received_packets)
193 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
194 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
195 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
196 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
199 if (!lookup_for_responses_to_locally_received_packets)
201 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
202 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
203 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
204 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
207 if (lookup_for_responses_to_locally_received_packets)
209 lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
210 lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
211 lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
212 lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
216 lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
217 lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
218 lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
219 lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
222 ASSERT (lb_index0 && lb_index1 && lb_index2 && lb_index3);
223 lb0 = load_balance_get (lb_index0);
224 lb1 = load_balance_get (lb_index1);
225 lb2 = load_balance_get (lb_index2);
226 lb3 = load_balance_get (lb_index3);
228 ASSERT (lb0->lb_n_buckets > 0);
229 ASSERT (is_pow2 (lb0->lb_n_buckets));
230 ASSERT (lb1->lb_n_buckets > 0);
231 ASSERT (is_pow2 (lb1->lb_n_buckets));
232 ASSERT (lb2->lb_n_buckets > 0);
233 ASSERT (is_pow2 (lb2->lb_n_buckets));
234 ASSERT (lb3->lb_n_buckets > 0);
235 ASSERT (is_pow2 (lb3->lb_n_buckets));
237 /* Use flow hash to compute multipath adjacency. */
238 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
239 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
240 hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
241 hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
242 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
244 flow_hash_config0 = lb0->lb_hash_config;
245 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
246 ip4_compute_flow_hash (ip0, flow_hash_config0);
248 load_balance_get_fwd_bucket (lb0,
250 (lb0->lb_n_buckets_minus_1)));
254 dpo0 = load_balance_get_bucket_i (lb0, 0);
256 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
258 flow_hash_config1 = lb1->lb_hash_config;
259 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
260 ip4_compute_flow_hash (ip1, flow_hash_config1);
262 load_balance_get_fwd_bucket (lb1,
264 (lb1->lb_n_buckets_minus_1)));
268 dpo1 = load_balance_get_bucket_i (lb1, 0);
270 if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
272 flow_hash_config2 = lb2->lb_hash_config;
273 hash_c2 = vnet_buffer (p2)->ip.flow_hash =
274 ip4_compute_flow_hash (ip2, flow_hash_config2);
276 load_balance_get_fwd_bucket (lb2,
278 (lb2->lb_n_buckets_minus_1)));
282 dpo2 = load_balance_get_bucket_i (lb2, 0);
284 if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
286 flow_hash_config3 = lb3->lb_hash_config;
287 hash_c3 = vnet_buffer (p3)->ip.flow_hash =
288 ip4_compute_flow_hash (ip3, flow_hash_config3);
290 load_balance_get_fwd_bucket (lb3,
292 (lb3->lb_n_buckets_minus_1)));
296 dpo3 = load_balance_get_bucket_i (lb3, 0);
299 next0 = dpo0->dpoi_next_node;
300 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
301 next1 = dpo1->dpoi_next_node;
302 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
303 next2 = dpo2->dpoi_next_node;
304 vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
305 next3 = dpo3->dpoi_next_node;
306 vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
308 vlib_increment_combined_counter
309 (cm, thread_index, lb_index0, 1,
310 vlib_buffer_length_in_chain (vm, p0));
311 vlib_increment_combined_counter
312 (cm, thread_index, lb_index1, 1,
313 vlib_buffer_length_in_chain (vm, p1));
314 vlib_increment_combined_counter
315 (cm, thread_index, lb_index2, 1,
316 vlib_buffer_length_in_chain (vm, p2));
317 vlib_increment_combined_counter
318 (cm, thread_index, lb_index3, 1,
319 vlib_buffer_length_in_chain (vm, p3));
321 vlib_validate_buffer_enqueue_x4 (vm, node, next,
322 to_next, n_left_to_next,
324 next0, next1, next2, next3);
327 while (n_left_from > 0 && n_left_to_next > 0)
331 ip_lookup_next_t next0;
332 const load_balance_t *lb0;
333 ip4_fib_mtrie_t *mtrie0;
334 ip4_fib_mtrie_leaf_t leaf0;
335 ip4_address_t *dst_addr0;
336 u32 pi0, fib_index0, lbi0;
337 flow_hash_config_t flow_hash_config0;
338 const dpo_id_t *dpo0;
344 p0 = vlib_get_buffer (vm, pi0);
346 ip0 = vlib_buffer_get_current (p0);
348 dst_addr0 = &ip0->dst_address;
351 vec_elt (im->fib_index_by_sw_if_index,
352 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
354 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
355 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
357 if (!lookup_for_responses_to_locally_received_packets)
359 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
361 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
364 if (!lookup_for_responses_to_locally_received_packets)
365 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
367 if (!lookup_for_responses_to_locally_received_packets)
368 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
370 if (lookup_for_responses_to_locally_received_packets)
371 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
374 /* Handle default route. */
375 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
379 lb0 = load_balance_get (lbi0);
381 ASSERT (lb0->lb_n_buckets > 0);
382 ASSERT (is_pow2 (lb0->lb_n_buckets));
384 /* Use flow hash to compute multipath adjacency. */
385 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
386 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
388 flow_hash_config0 = lb0->lb_hash_config;
390 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
391 ip4_compute_flow_hash (ip0, flow_hash_config0);
393 load_balance_get_fwd_bucket (lb0,
395 (lb0->lb_n_buckets_minus_1)));
399 dpo0 = load_balance_get_bucket_i (lb0, 0);
402 next0 = dpo0->dpoi_next_node;
403 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
405 vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
406 vlib_buffer_length_in_chain (vm,
414 if (PREDICT_FALSE (next0 != next))
417 vlib_put_next_frame (vm, node, next, n_left_to_next);
419 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
426 vlib_put_next_frame (vm, node, next, n_left_to_next);
429 if (node->flags & VLIB_NODE_FLAG_TRACE)
430 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
432 return frame->n_vectors;
435 /** @brief IPv4 lookup node.
438 This is the main IPv4 lookup dispatch node.
440 @param vm vlib_main_t corresponding to the current thread
441 @param node vlib_node_runtime_t
442 @param frame vlib_frame_t whose contents should be dispatched
444 @par Graph mechanics: buffer metadata, next index usage
447 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
448 - Indicates the @c sw_if_index value of the interface that the
449 packet was received on.
450 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
451 - When the value is @c ~0 then the node performs a longest prefix
452 match (LPM) for the packet destination address in the FIB attached
453 to the receive interface.
454 - Otherwise perform LPM for the packet destination address in the
455 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
456 value (0, 1, ...) and not a VRF id.
459 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
460 - The lookup result adjacency index.
463 - Dispatches the packet to the node index found in
464 ip_adjacency_t @c adj->lookup_next_index
465 (where @c adj is the lookup result adjacency).
468 ip4_lookup (vlib_main_t * vm,
469 vlib_node_runtime_t * node, vlib_frame_t * frame)
471 return ip4_lookup_inline (vm, node, frame,
472 /* lookup_for_responses_to_locally_received_packets */
477 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
479 VLIB_REGISTER_NODE (ip4_lookup_node) =
481 .function = ip4_lookup,.name = "ip4-lookup",.vector_size =
482 sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
483 IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
485 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
488 ip4_load_balance (vlib_main_t * vm,
489 vlib_node_runtime_t * node, vlib_frame_t * frame)
491 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
492 u32 n_left_from, n_left_to_next, *from, *to_next;
493 ip_lookup_next_t next;
494 u32 thread_index = vlib_get_thread_index ();
496 from = vlib_frame_vector_args (frame);
497 n_left_from = frame->n_vectors;
498 next = node->cached_next_index;
500 if (node->flags & VLIB_NODE_FLAG_TRACE)
501 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
503 while (n_left_from > 0)
505 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
508 while (n_left_from >= 4 && n_left_to_next >= 2)
510 ip_lookup_next_t next0, next1;
511 const load_balance_t *lb0, *lb1;
512 vlib_buffer_t *p0, *p1;
513 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
514 const ip4_header_t *ip0, *ip1;
515 const dpo_id_t *dpo0, *dpo1;
517 /* Prefetch next iteration. */
519 vlib_buffer_t *p2, *p3;
521 p2 = vlib_get_buffer (vm, from[2]);
522 p3 = vlib_get_buffer (vm, from[3]);
524 vlib_prefetch_buffer_header (p2, STORE);
525 vlib_prefetch_buffer_header (p3, STORE);
527 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
528 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
531 pi0 = to_next[0] = from[0];
532 pi1 = to_next[1] = from[1];
539 p0 = vlib_get_buffer (vm, pi0);
540 p1 = vlib_get_buffer (vm, pi1);
542 ip0 = vlib_buffer_get_current (p0);
543 ip1 = vlib_buffer_get_current (p1);
544 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
545 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
547 lb0 = load_balance_get (lbi0);
548 lb1 = load_balance_get (lbi1);
551 * this node is for via FIBs we can re-use the hash value from the
552 * to node if present.
553 * We don't want to use the same hash value at each level in the recursion
554 * graph as that would lead to polarisation
558 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
560 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
562 hc0 = vnet_buffer (p0)->ip.flow_hash =
563 vnet_buffer (p0)->ip.flow_hash >> 1;
567 hc0 = vnet_buffer (p0)->ip.flow_hash =
568 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
570 dpo0 = load_balance_get_fwd_bucket
571 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
575 dpo0 = load_balance_get_bucket_i (lb0, 0);
577 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
579 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
581 hc1 = vnet_buffer (p1)->ip.flow_hash =
582 vnet_buffer (p1)->ip.flow_hash >> 1;
586 hc1 = vnet_buffer (p1)->ip.flow_hash =
587 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
589 dpo1 = load_balance_get_fwd_bucket
590 (lb1, (hc1 & (lb1->lb_n_buckets_minus_1)));
594 dpo1 = load_balance_get_bucket_i (lb1, 0);
597 next0 = dpo0->dpoi_next_node;
598 next1 = dpo1->dpoi_next_node;
600 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
601 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
603 vlib_increment_combined_counter
604 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
605 vlib_increment_combined_counter
606 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
608 vlib_validate_buffer_enqueue_x2 (vm, node, next,
609 to_next, n_left_to_next,
610 pi0, pi1, next0, next1);
613 while (n_left_from > 0 && n_left_to_next > 0)
615 ip_lookup_next_t next0;
616 const load_balance_t *lb0;
619 const ip4_header_t *ip0;
620 const dpo_id_t *dpo0;
629 p0 = vlib_get_buffer (vm, pi0);
631 ip0 = vlib_buffer_get_current (p0);
632 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
634 lb0 = load_balance_get (lbi0);
637 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
639 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
641 hc0 = vnet_buffer (p0)->ip.flow_hash =
642 vnet_buffer (p0)->ip.flow_hash >> 1;
646 hc0 = vnet_buffer (p0)->ip.flow_hash =
647 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
649 dpo0 = load_balance_get_fwd_bucket
650 (lb0, (hc0 & (lb0->lb_n_buckets_minus_1)));
654 dpo0 = load_balance_get_bucket_i (lb0, 0);
657 next0 = dpo0->dpoi_next_node;
658 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
660 vlib_increment_combined_counter
661 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
663 vlib_validate_buffer_enqueue_x1 (vm, node, next,
664 to_next, n_left_to_next,
668 vlib_put_next_frame (vm, node, next, n_left_to_next);
671 return frame->n_vectors;
674 VLIB_REGISTER_NODE (ip4_load_balance_node) =
676 .function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
677 sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
678 format_ip4_lookup_trace,};
680 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
682 /* get first interface address */
684 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
685 ip_interface_address_t ** result_ia)
687 ip_lookup_main_t *lm = &im->lookup_main;
688 ip_interface_address_t *ia = 0;
689 ip4_address_t *result = 0;
692 foreach_ip_interface_address
693 (lm, ia, sw_if_index,
694 1 /* honor unnumbered */ ,
697 ip_interface_address_get_address (lm, ia);
703 *result_ia = result ? ia : 0;
708 ip4_add_interface_routes (u32 sw_if_index,
709 ip4_main_t * im, u32 fib_index,
710 ip_interface_address_t * a)
712 ip_lookup_main_t *lm = &im->lookup_main;
713 ip4_address_t *address = ip_interface_address_get_address (lm, a);
715 .fp_len = a->address_length,
716 .fp_proto = FIB_PROTOCOL_IP4,
717 .fp_addr.ip4 = *address,
720 if (pfx.fp_len <= 30)
722 /* a /30 or shorter - add a glean for the network address */
723 fib_table_entry_update_one_path (fib_index, &pfx,
724 FIB_SOURCE_INTERFACE,
725 (FIB_ENTRY_FLAG_CONNECTED |
726 FIB_ENTRY_FLAG_ATTACHED),
728 /* No next-hop address */
734 // no out-label stack
736 FIB_ROUTE_PATH_FLAG_NONE);
738 /* Add the two broadcast addresses as drop */
739 fib_prefix_t net_pfx = {
741 .fp_proto = FIB_PROTOCOL_IP4,
742 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
744 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
745 fib_table_entry_special_add(fib_index,
747 FIB_SOURCE_INTERFACE,
748 (FIB_ENTRY_FLAG_DROP |
749 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
750 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
751 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
752 fib_table_entry_special_add(fib_index,
754 FIB_SOURCE_INTERFACE,
755 (FIB_ENTRY_FLAG_DROP |
756 FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT));
758 else if (pfx.fp_len == 31)
760 u32 mask = clib_host_to_net_u32(1);
761 fib_prefix_t net_pfx = pfx;
764 net_pfx.fp_addr.ip4.as_u32 ^= mask;
766 /* a /31 - add the other end as an attached host */
767 fib_table_entry_update_one_path (fib_index, &net_pfx,
768 FIB_SOURCE_INTERFACE,
769 (FIB_ENTRY_FLAG_ATTACHED),
777 FIB_ROUTE_PATH_FLAG_NONE);
781 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
783 u32 classify_table_index =
784 lm->classify_table_index_by_sw_if_index[sw_if_index];
785 if (classify_table_index != (u32) ~ 0)
787 dpo_id_t dpo = DPO_INVALID;
792 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
794 fib_table_entry_special_dpo_add (fib_index,
797 FIB_ENTRY_FLAG_NONE, &dpo);
802 fib_table_entry_update_one_path (fib_index, &pfx,
803 FIB_SOURCE_INTERFACE,
804 (FIB_ENTRY_FLAG_CONNECTED |
805 FIB_ENTRY_FLAG_LOCAL),
812 FIB_ROUTE_PATH_FLAG_NONE);
816 ip4_del_interface_routes (ip4_main_t * im,
818 ip4_address_t * address, u32 address_length)
821 .fp_len = address_length,
822 .fp_proto = FIB_PROTOCOL_IP4,
823 .fp_addr.ip4 = *address,
826 if (pfx.fp_len <= 30)
828 fib_prefix_t net_pfx = {
830 .fp_proto = FIB_PROTOCOL_IP4,
831 .fp_addr.ip4.as_u32 = address->as_u32 & im->fib_masks[pfx.fp_len],
833 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
834 fib_table_entry_special_remove(fib_index,
836 FIB_SOURCE_INTERFACE);
837 net_pfx.fp_addr.ip4.as_u32 |= ~im->fib_masks[pfx.fp_len];
838 if (net_pfx.fp_addr.ip4.as_u32 != pfx.fp_addr.ip4.as_u32)
839 fib_table_entry_special_remove(fib_index,
841 FIB_SOURCE_INTERFACE);
842 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
844 else if (pfx.fp_len == 31)
846 u32 mask = clib_host_to_net_u32(1);
847 fib_prefix_t net_pfx = pfx;
850 net_pfx.fp_addr.ip4.as_u32 ^= mask;
852 fib_table_entry_delete (fib_index, &net_pfx, FIB_SOURCE_INTERFACE);
856 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
860 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
862 ip4_main_t *im = &ip4_main;
864 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
867 * enable/disable only on the 1<->0 transition
871 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
876 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
877 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
880 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
884 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop",
885 sw_if_index, !is_enable, 0, 0);
888 static clib_error_t *
889 ip4_add_del_interface_address_internal (vlib_main_t * vm,
891 ip4_address_t * address,
892 u32 address_length, u32 is_del)
894 vnet_main_t *vnm = vnet_get_main ();
895 ip4_main_t *im = &ip4_main;
896 ip_lookup_main_t *lm = &im->lookup_main;
897 clib_error_t *error = 0;
898 u32 if_address_index, elts_before;
899 ip4_address_fib_t ip4_af, *addr_fib = 0;
901 /* local0 interface doesn't support IP addressing */
902 if (sw_if_index == 0)
905 clib_error_create ("local0 interface doesn't support IP addressing");
908 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
909 ip4_addr_fib_init (&ip4_af, address,
910 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
911 vec_add1 (addr_fib, ip4_af);
914 * there is no support for adj-fib handling in the presence of overlapping
915 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
921 /* When adding an address check that it does not conflict
922 with an existing address. */
923 ip_interface_address_t *ia;
924 foreach_ip_interface_address
925 (&im->lookup_main, ia, sw_if_index,
926 0 /* honor unnumbered */ ,
929 ip_interface_address_get_address
930 (&im->lookup_main, ia);
931 if (ip4_destination_matches_route
932 (im, address, x, ia->address_length) ||
933 ip4_destination_matches_route (im,
939 ("failed to add %U which conflicts with %U for interface %U",
940 format_ip4_address_and_length, address,
942 format_ip4_address_and_length, x,
944 format_vnet_sw_if_index_name, vnm,
950 elts_before = pool_elts (lm->if_address_pool);
952 error = ip_interface_address_add_del
953 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
957 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
960 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
962 ip4_add_interface_routes (sw_if_index,
963 im, ip4_af.fib_index,
965 (lm->if_address_pool, if_address_index));
967 /* If pool did not grow/shrink: add duplicate address. */
968 if (elts_before != pool_elts (lm->if_address_pool))
970 ip4_add_del_interface_address_callback_t *cb;
971 vec_foreach (cb, im->add_del_interface_address_callbacks)
972 cb->function (im, cb->function_opaque, sw_if_index,
973 address, address_length, if_address_index, is_del);
982 ip4_add_del_interface_address (vlib_main_t * vm,
984 ip4_address_t * address,
985 u32 address_length, u32 is_del)
987 return ip4_add_del_interface_address_internal
988 (vm, sw_if_index, address, address_length, is_del);
991 /* Built-in ip4 unicast rx feature path definition */
993 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
995 .arc_name = "ip4-unicast",
996 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
997 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
1000 VNET_FEATURE_INIT (ip4_flow_classify, static) =
1002 .arc_name = "ip4-unicast",
1003 .node_name = "ip4-flow-classify",
1004 .runs_before = VNET_FEATURES ("ip4-inacl"),
1007 VNET_FEATURE_INIT (ip4_inacl, static) =
1009 .arc_name = "ip4-unicast",
1010 .node_name = "ip4-inacl",
1011 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
1014 VNET_FEATURE_INIT (ip4_source_check_1, static) =
1016 .arc_name = "ip4-unicast",
1017 .node_name = "ip4-source-check-via-rx",
1018 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
1021 VNET_FEATURE_INIT (ip4_source_check_2, static) =
1023 .arc_name = "ip4-unicast",
1024 .node_name = "ip4-source-check-via-any",
1025 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1028 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
1030 .arc_name = "ip4-unicast",
1031 .node_name = "ip4-source-and-port-range-check-rx",
1032 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
1035 VNET_FEATURE_INIT (ip4_policer_classify, static) =
1037 .arc_name = "ip4-unicast",
1038 .node_name = "ip4-policer-classify",
1039 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1042 VNET_FEATURE_INIT (ip4_ipsec, static) =
1044 .arc_name = "ip4-unicast",
1045 .node_name = "ipsec-input-ip4",
1046 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1049 VNET_FEATURE_INIT (ip4_vpath, static) =
1051 .arc_name = "ip4-unicast",
1052 .node_name = "vpath-input-ip4",
1053 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1056 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1058 .arc_name = "ip4-unicast",
1059 .node_name = "ip4-vxlan-bypass",
1060 .runs_before = VNET_FEATURES ("ip4-lookup"),
1063 VNET_FEATURE_INIT (ip4_drop, static) =
1065 .arc_name = "ip4-unicast",
1066 .node_name = "ip4-drop",
1067 .runs_before = VNET_FEATURES ("ip4-lookup"),
1070 VNET_FEATURE_INIT (ip4_lookup, static) =
1072 .arc_name = "ip4-unicast",
1073 .node_name = "ip4-lookup",
1074 .runs_before = 0, /* not before any other features */
1077 /* Built-in ip4 multicast rx feature path definition */
1078 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1080 .arc_name = "ip4-multicast",
1081 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1082 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1085 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1087 .arc_name = "ip4-multicast",
1088 .node_name = "vpath-input-ip4",
1089 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1092 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1094 .arc_name = "ip4-multicast",
1095 .node_name = "ip4-drop",
1096 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1099 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1101 .arc_name = "ip4-multicast",
1102 .node_name = "ip4-mfib-forward-lookup",
1103 .runs_before = 0, /* last feature */
1106 /* Source and port-range check ip4 tx feature path definition */
1107 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1109 .arc_name = "ip4-output",
1110 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1111 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1114 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1116 .arc_name = "ip4-output",
1117 .node_name = "ip4-source-and-port-range-check-tx",
1118 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1121 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1123 .arc_name = "ip4-output",
1124 .node_name = "ipsec-output-ip4",
1125 .runs_before = VNET_FEATURES ("interface-output"),
1128 /* Built-in ip4 tx feature path definition */
1129 VNET_FEATURE_INIT (ip4_interface_output, static) =
1131 .arc_name = "ip4-output",
1132 .node_name = "interface-output",
1133 .runs_before = 0, /* not before any other features */
1137 static clib_error_t *
1138 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1140 ip4_main_t *im = &ip4_main;
1142 /* Fill in lookup tables with default table (0). */
1143 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1144 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1148 ip4_main_t *im4 = &ip4_main;
1149 ip_lookup_main_t *lm4 = &im4->lookup_main;
1150 ip_interface_address_t *ia = 0;
1151 ip4_address_t *address;
1152 vlib_main_t *vm = vlib_get_main ();
1155 foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* honor unnumbered */,
1157 address = ip_interface_address_get_address (lm4, ia);
1158 ip4_add_del_interface_address(vm, sw_if_index, address, ia->address_length, 1);
1163 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1166 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1169 return /* no error */ 0;
1172 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1174 /* Global IP4 main. */
1175 ip4_main_t ip4_main;
1178 ip4_lookup_init (vlib_main_t * vm)
1180 ip4_main_t *im = &ip4_main;
1181 clib_error_t *error;
1184 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1187 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1192 m = pow2_mask (i) << (32 - i);
1195 im->fib_masks[i] = clib_host_to_net_u32 (m);
1198 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1200 /* Create FIB with index 0 and table id of 0. */
1201 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1202 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1206 pn = pg_get_node (ip4_lookup_node.index);
1207 pn->unformat_edit = unformat_pg_ip4_header;
1211 ethernet_arp_header_t h;
1213 memset (&h, 0, sizeof (h));
1215 /* Set target ethernet address to all zeros. */
1216 memset (h.ip4_over_ethernet[1].ethernet, 0,
1217 sizeof (h.ip4_over_ethernet[1].ethernet));
1219 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1220 #define _8(f,v) h.f = v;
1221 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1222 _16 (l3_type, ETHERNET_TYPE_IP4);
1223 _8 (n_l2_address_bytes, 6);
1224 _8 (n_l3_address_bytes, 4);
1225 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1229 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1232 /* alloc chunk size */ 8,
1239 VLIB_INIT_FUNCTION (ip4_lookup_init);
1243 /* Adjacency taken. */
1248 /* Packet data, possibly *after* rewrite. */
1249 u8 packet_data[64 - 1 * sizeof (u32)];
1251 ip4_forward_next_trace_t;
1254 format_ip4_forward_next_trace (u8 * s, va_list * args)
1256 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1257 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1258 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1259 uword indent = format_get_indent (s);
1260 s = format (s, "%U%U",
1261 format_white_space, indent,
1262 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1267 format_ip4_lookup_trace (u8 * s, va_list * args)
1269 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1270 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1271 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1272 uword indent = format_get_indent (s);
1274 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1275 t->fib_index, t->dpo_index, t->flow_hash);
1276 s = format (s, "\n%U%U",
1277 format_white_space, indent,
1278 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1283 format_ip4_rewrite_trace (u8 * s, va_list * args)
1285 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1286 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1287 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1288 uword indent = format_get_indent (s);
1290 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1291 t->fib_index, t->dpo_index, format_ip_adjacency,
1292 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1293 s = format (s, "\n%U%U",
1294 format_white_space, indent,
1295 format_ip_adjacency_packet_data,
1296 t->dpo_index, t->packet_data, sizeof (t->packet_data));
1300 /* Common trace function for all ip4-forward next nodes. */
1302 ip4_forward_next_trace (vlib_main_t * vm,
1303 vlib_node_runtime_t * node,
1304 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1307 ip4_main_t *im = &ip4_main;
1309 n_left = frame->n_vectors;
1310 from = vlib_frame_vector_args (frame);
1315 vlib_buffer_t *b0, *b1;
1316 ip4_forward_next_trace_t *t0, *t1;
1318 /* Prefetch next iteration. */
1319 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1320 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1325 b0 = vlib_get_buffer (vm, bi0);
1326 b1 = vlib_get_buffer (vm, bi1);
1328 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1330 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1331 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1332 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1334 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1335 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1336 vec_elt (im->fib_index_by_sw_if_index,
1337 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1339 clib_memcpy (t0->packet_data,
1340 vlib_buffer_get_current (b0),
1341 sizeof (t0->packet_data));
1343 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1345 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1346 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1347 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1349 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1350 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1351 vec_elt (im->fib_index_by_sw_if_index,
1352 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1353 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1354 sizeof (t1->packet_data));
1364 ip4_forward_next_trace_t *t0;
1368 b0 = vlib_get_buffer (vm, bi0);
1370 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1372 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1373 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1374 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1376 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1377 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1378 vec_elt (im->fib_index_by_sw_if_index,
1379 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1380 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1381 sizeof (t0->packet_data));
1389 ip4_drop_or_punt (vlib_main_t * vm,
1390 vlib_node_runtime_t * node,
1391 vlib_frame_t * frame, ip4_error_t error_code)
1393 u32 *buffers = vlib_frame_vector_args (frame);
1394 uword n_packets = frame->n_vectors;
1396 vlib_error_drop_buffers (vm, node, buffers,
1400 ip4_input_node.index, error_code);
1402 if (node->flags & VLIB_NODE_FLAG_TRACE)
1403 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1409 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1411 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1415 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1417 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1421 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1423 .function = ip4_drop,
1425 .vector_size = sizeof (u32),
1426 .format_trace = format_ip4_forward_next_trace,
1433 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1435 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1437 .function = ip4_punt,
1439 .vector_size = sizeof (u32),
1440 .format_trace = format_ip4_forward_next_trace,
1447 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1450 /* Compute TCP/UDP/ICMP4 checksum in software. */
1452 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1456 u32 ip_header_length, payload_length_host_byte_order;
1457 u32 n_this_buffer, n_bytes_left;
1459 void *data_this_buffer;
1461 /* Initialize checksum with ip header. */
1462 ip_header_length = ip4_header_bytes (ip0);
1463 payload_length_host_byte_order =
1464 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1466 clib_host_to_net_u32 (payload_length_host_byte_order +
1467 (ip0->protocol << 16));
1469 if (BITS (uword) == 32)
1472 ip_csum_with_carry (sum0,
1473 clib_mem_unaligned (&ip0->src_address, u32));
1475 ip_csum_with_carry (sum0,
1476 clib_mem_unaligned (&ip0->dst_address, u32));
1480 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1482 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1483 data_this_buffer = (void *) ip0 + ip_header_length;
1484 if (n_this_buffer + ip_header_length > p0->current_length)
1486 p0->current_length >
1487 ip_header_length ? p0->current_length - ip_header_length : 0;
1490 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1491 n_bytes_left -= n_this_buffer;
1492 if (n_bytes_left == 0)
1495 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1496 p0 = vlib_get_buffer (vm, p0->next_buffer);
1497 data_this_buffer = vlib_buffer_get_current (p0);
1498 n_this_buffer = p0->current_length;
1501 sum16 = ~ip_csum_fold (sum0);
1507 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1509 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1513 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1514 || ip0->protocol == IP_PROTOCOL_UDP);
1516 udp0 = (void *) (ip0 + 1);
1517 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1519 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1520 | VNET_BUFFER_F_L4_CHECKSUM_CORRECT);
1524 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1526 p0->flags |= (VNET_BUFFER_F_L4_CHECKSUM_COMPUTED
1527 | ((sum16 == 0) << VNET_BUFFER_F_LOG2_L4_CHECKSUM_CORRECT));
1533 VNET_FEATURE_ARC_INIT (ip4_local) =
1535 .arc_name = "ip4-local",
1536 .start_nodes = VNET_FEATURES ("ip4-local"),
1541 ip4_local_inline (vlib_main_t * vm,
1542 vlib_node_runtime_t * node,
1543 vlib_frame_t * frame, int head_of_feature_arc)
1545 ip4_main_t *im = &ip4_main;
1546 ip_lookup_main_t *lm = &im->lookup_main;
1547 ip_local_next_t next_index;
1548 u32 *from, *to_next, n_left_from, n_left_to_next;
1549 vlib_node_runtime_t *error_node =
1550 vlib_node_get_runtime (vm, ip4_input_node.index);
1551 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1553 from = vlib_frame_vector_args (frame);
1554 n_left_from = frame->n_vectors;
1555 next_index = node->cached_next_index;
1557 if (node->flags & VLIB_NODE_FLAG_TRACE)
1558 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1560 while (n_left_from > 0)
1562 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1564 while (n_left_from >= 4 && n_left_to_next >= 2)
1566 vlib_buffer_t *p0, *p1;
1567 ip4_header_t *ip0, *ip1;
1568 udp_header_t *udp0, *udp1;
1569 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1570 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1571 const dpo_id_t *dpo0, *dpo1;
1572 const load_balance_t *lb0, *lb1;
1573 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, lbi0;
1574 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, lbi1;
1575 i32 len_diff0, len_diff1;
1576 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1577 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1578 u32 sw_if_index0, sw_if_index1;
1580 pi0 = to_next[0] = from[0];
1581 pi1 = to_next[1] = from[1];
1585 n_left_to_next -= 2;
1587 next0 = next1 = IP_LOCAL_NEXT_DROP;
1589 p0 = vlib_get_buffer (vm, pi0);
1590 p1 = vlib_get_buffer (vm, pi1);
1592 ip0 = vlib_buffer_get_current (p0);
1593 ip1 = vlib_buffer_get_current (p1);
1595 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1596 vnet_buffer (p1)->l3_hdr_offset = p1->current_data;
1598 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1599 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1601 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1602 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1604 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1606 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1607 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1609 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1611 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1612 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1614 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1615 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1617 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1618 leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, &ip1->src_address);
1620 /* Treat IP frag packets as "experimental" protocol for now
1621 until support of IP frag reassembly is implemented */
1622 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1623 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1625 if (head_of_feature_arc == 0)
1627 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1631 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1632 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1633 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1634 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1639 good_tcp_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1640 good_tcp_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1642 udp0 = ip4_next_header (ip0);
1643 udp1 = ip4_next_header (ip1);
1645 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1646 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1647 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1649 /* Verify UDP length. */
1650 ip_len0 = clib_net_to_host_u16 (ip0->length);
1651 ip_len1 = clib_net_to_host_u16 (ip1->length);
1652 udp_len0 = clib_net_to_host_u16 (udp0->length);
1653 udp_len1 = clib_net_to_host_u16 (udp1->length);
1655 len_diff0 = ip_len0 - udp_len0;
1656 len_diff1 = ip_len1 - udp_len1;
1658 len_diff0 = is_udp0 ? len_diff0 : 0;
1659 len_diff1 = is_udp1 ? len_diff1 : 0;
1661 if (PREDICT_FALSE (!(is_tcp_udp0 & is_tcp_udp1
1662 & good_tcp_udp0 & good_tcp_udp1)))
1667 && !(flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1668 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1670 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1671 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1676 && !(flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1677 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1679 (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1680 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1684 good_tcp_udp0 &= len_diff0 >= 0;
1685 good_tcp_udp1 &= len_diff1 >= 0;
1688 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1690 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1692 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1694 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1695 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1697 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1698 error0 = (is_tcp_udp0 && !good_tcp_udp0
1699 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1700 error1 = (is_tcp_udp1 && !good_tcp_udp1
1701 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1704 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1706 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1708 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1709 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1710 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1712 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1713 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1714 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1716 lb0 = load_balance_get (lbi0);
1717 lb1 = load_balance_get (lbi1);
1718 dpo0 = load_balance_get_bucket_i (lb0, 0);
1719 dpo1 = load_balance_get_bucket_i (lb1, 0);
1722 * Must have a route to source otherwise we drop the packet.
1723 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1726 * - the source is a recieve => it's from us => bogus, do this
1727 * first since it sets a different error code.
1728 * - uRPF check for any route to source - accept if passes.
1729 * - allow packets destined to the broadcast address from unknown sources
1731 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1732 dpo0->dpoi_type == DPO_RECEIVE) ?
1733 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1734 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1735 !fib_urpf_check_size (lb0->lb_urpf) &&
1736 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1737 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1738 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1739 dpo1->dpoi_type == DPO_RECEIVE) ?
1740 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1741 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1742 !fib_urpf_check_size (lb1->lb_urpf) &&
1743 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1744 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1748 next0 = lm->local_next_by_ip_protocol[proto0];
1749 next1 = lm->local_next_by_ip_protocol[proto1];
1752 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1754 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1756 p0->error = error0 ? error_node->errors[error0] : 0;
1757 p1->error = error1 ? error_node->errors[error1] : 0;
1759 if (head_of_feature_arc)
1761 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1762 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1763 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1764 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1767 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1768 n_left_to_next, pi0, pi1,
1772 while (n_left_from > 0 && n_left_to_next > 0)
1777 ip4_fib_mtrie_t *mtrie0;
1778 ip4_fib_mtrie_leaf_t leaf0;
1779 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
1781 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1782 load_balance_t *lb0;
1783 const dpo_id_t *dpo0;
1786 pi0 = to_next[0] = from[0];
1790 n_left_to_next -= 1;
1792 next0 = IP_LOCAL_NEXT_DROP;
1794 p0 = vlib_get_buffer (vm, pi0);
1796 ip0 = vlib_buffer_get_current (p0);
1798 vnet_buffer (p0)->l3_hdr_offset = p0->current_data;
1800 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1802 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1805 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1806 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1808 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1810 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, &ip0->src_address);
1812 /* Treat IP frag packets as "experimental" protocol for now
1813 until support of IP frag reassembly is implemented */
1814 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1816 if (head_of_feature_arc == 0)
1818 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1822 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1823 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1827 good_tcp_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1829 udp0 = ip4_next_header (ip0);
1831 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1832 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1834 /* Verify UDP length. */
1835 ip_len0 = clib_net_to_host_u16 (ip0->length);
1836 udp_len0 = clib_net_to_host_u16 (udp0->length);
1838 len_diff0 = ip_len0 - udp_len0;
1840 len_diff0 = is_udp0 ? len_diff0 : 0;
1842 if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
1847 && !(flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED))
1848 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1850 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1851 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1855 good_tcp_udp0 &= len_diff0 >= 0;
1858 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1860 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1862 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1864 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1865 error0 = (is_tcp_udp0 && !good_tcp_udp0
1866 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1869 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1871 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1872 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1874 lb0 = load_balance_get (lbi0);
1875 dpo0 = load_balance_get_bucket_i (lb0, 0);
1877 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1878 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1880 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1881 dpo0->dpoi_type == DPO_RECEIVE) ?
1882 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1883 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1884 !fib_urpf_check_size (lb0->lb_urpf) &&
1885 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1886 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1890 next0 = lm->local_next_by_ip_protocol[proto0];
1893 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1895 p0->error = error0 ? error_node->errors[error0] : 0;
1897 if (head_of_feature_arc)
1899 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1900 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1903 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1904 n_left_to_next, pi0, next0);
1908 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1911 return frame->n_vectors;
1915 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1917 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1921 VLIB_REGISTER_NODE (ip4_local_node) =
1923 .function = ip4_local,
1924 .name = "ip4-local",
1925 .vector_size = sizeof (u32),
1926 .format_trace = format_ip4_forward_next_trace,
1927 .n_next_nodes = IP_LOCAL_N_NEXT,
1930 [IP_LOCAL_NEXT_DROP] = "error-drop",
1931 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1932 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1933 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
1937 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1940 ip4_local_end_of_arc (vlib_main_t * vm,
1941 vlib_node_runtime_t * node, vlib_frame_t * frame)
1943 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1947 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1948 .function = ip4_local_end_of_arc,
1949 .name = "ip4-local-end-of-arc",
1950 .vector_size = sizeof (u32),
1952 .format_trace = format_ip4_forward_next_trace,
1953 .sibling_of = "ip4-local",
1956 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1958 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1959 .arc_name = "ip4-local",
1960 .node_name = "ip4-local-end-of-arc",
1961 .runs_before = 0, /* not before any other features */
1966 ip4_register_protocol (u32 protocol, u32 node_index)
1968 vlib_main_t *vm = vlib_get_main ();
1969 ip4_main_t *im = &ip4_main;
1970 ip_lookup_main_t *lm = &im->lookup_main;
1972 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1973 lm->local_next_by_ip_protocol[protocol] =
1974 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1977 static clib_error_t *
1978 show_ip_local_command_fn (vlib_main_t * vm,
1979 unformat_input_t * input, vlib_cli_command_t * cmd)
1981 ip4_main_t *im = &ip4_main;
1982 ip_lookup_main_t *lm = &im->lookup_main;
1985 vlib_cli_output (vm, "Protocols handled by ip4_local");
1986 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1988 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1989 vlib_cli_output (vm, "%d", i);
1997 * Display the set of protocols handled by the local IPv4 stack.
2000 * Example of how to display local protocol table:
2001 * @cliexstart{show ip local}
2002 * Protocols handled by ip4_local
2009 VLIB_CLI_COMMAND (show_ip_local, static) =
2011 .path = "show ip local",
2012 .function = show_ip_local_command_fn,
2013 .short_help = "show ip local",
2018 ip4_arp_inline (vlib_main_t * vm,
2019 vlib_node_runtime_t * node,
2020 vlib_frame_t * frame, int is_glean)
2022 vnet_main_t *vnm = vnet_get_main ();
2023 ip4_main_t *im = &ip4_main;
2024 ip_lookup_main_t *lm = &im->lookup_main;
2025 u32 *from, *to_next_drop;
2026 uword n_left_from, n_left_to_next_drop, next_index;
2027 static f64 time_last_seed_change = -1e100;
2028 static u32 hash_seeds[3];
2029 static uword hash_bitmap[256 / BITS (uword)];
2032 if (node->flags & VLIB_NODE_FLAG_TRACE)
2033 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2035 time_now = vlib_time_now (vm);
2036 if (time_now - time_last_seed_change > 1e-3)
2039 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
2040 sizeof (hash_seeds));
2041 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2042 hash_seeds[i] = r[i];
2044 /* Mark all hash keys as been no-seen before. */
2045 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2048 time_last_seed_change = time_now;
2051 from = vlib_frame_vector_args (frame);
2052 n_left_from = frame->n_vectors;
2053 next_index = node->cached_next_index;
2054 if (next_index == IP4_ARP_NEXT_DROP)
2055 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2057 while (n_left_from > 0)
2059 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2060 to_next_drop, n_left_to_next_drop);
2062 while (n_left_from > 0 && n_left_to_next_drop > 0)
2064 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2065 ip_adjacency_t *adj0;
2072 p0 = vlib_get_buffer (vm, pi0);
2074 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2075 adj0 = adj_get (adj_index0);
2076 ip0 = vlib_buffer_get_current (p0);
2082 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2083 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2088 * this is the Glean case, so we are ARPing for the
2089 * packet's destination
2091 a0 ^= ip0->dst_address.data_u32;
2095 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2099 hash_v3_finalize32 (a0, b0, c0);
2101 c0 &= BITS (hash_bitmap) - 1;
2102 c0 = c0 / BITS (uword);
2103 m0 = (uword) 1 << (c0 % BITS (uword));
2105 bm0 = hash_bitmap[c0];
2106 drop0 = (bm0 & m0) != 0;
2108 /* Mark it as seen. */
2109 hash_bitmap[c0] = bm0 | m0;
2113 to_next_drop[0] = pi0;
2115 n_left_to_next_drop -= 1;
2118 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2119 IP4_ARP_ERROR_REQUEST_SENT];
2122 * the adj has been updated to a rewrite but the node the DPO that got
2123 * us here hasn't - yet. no big deal. we'll drop while we wait.
2125 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2132 * Can happen if the control-plane is programming tables
2133 * with traffic flowing; at least that's today's lame excuse.
2135 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2136 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2138 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2141 /* Send ARP request. */
2145 ethernet_arp_header_t *h0;
2146 vnet_hw_interface_t *hw_if0;
2149 vlib_packet_template_get_packet (vm,
2150 &im->ip4_arp_request_packet_template,
2153 /* Add rewrite/encap string for ARP packet. */
2154 vnet_rewrite_one_header (adj0[0], h0,
2155 sizeof (ethernet_header_t));
2157 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2159 /* Src ethernet address in ARP header. */
2160 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2162 sizeof (h0->ip4_over_ethernet[0].ethernet));
2166 /* The interface's source address is stashed in the Glean Adj */
2167 h0->ip4_over_ethernet[0].ip4 =
2168 adj0->sub_type.glean.receive_addr.ip4;
2170 /* Copy in destination address we are requesting. This is the
2171 * glean case, so it's the packet's destination.*/
2172 h0->ip4_over_ethernet[1].ip4.data_u32 =
2173 ip0->dst_address.data_u32;
2177 /* Src IP address in ARP header. */
2178 if (ip4_src_address_for_packet (lm, sw_if_index0,
2180 ip4_over_ethernet[0].ip4))
2182 /* No source address available */
2184 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2185 vlib_buffer_free (vm, &bi0, 1);
2189 /* Copy in destination address we are requesting from the
2191 h0->ip4_over_ethernet[1].ip4.data_u32 =
2192 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2195 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2196 b0 = vlib_get_buffer (vm, bi0);
2197 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2199 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2201 vlib_set_next_frame_buffer (vm, node,
2202 adj0->rewrite_header.next_index,
2207 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2210 return frame->n_vectors;
2214 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2216 return (ip4_arp_inline (vm, node, frame, 0));
2220 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2222 return (ip4_arp_inline (vm, node, frame, 1));
2225 static char *ip4_arp_error_strings[] = {
2226 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2227 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2228 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2229 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2230 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2231 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2234 VLIB_REGISTER_NODE (ip4_arp_node) =
2236 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2237 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2238 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2239 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2241 [IP4_ARP_NEXT_DROP] = "error-drop",}
2244 VLIB_REGISTER_NODE (ip4_glean_node) =
2246 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2247 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2248 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2249 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2251 [IP4_ARP_NEXT_DROP] = "error-drop",}
2254 #define foreach_notrace_ip4_arp_error \
2261 arp_notrace_init (vlib_main_t * vm)
2263 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2265 /* don't trace ARP request packets */
2267 vnet_pcap_drop_trace_filter_add_del \
2268 (rt->errors[IP4_ARP_ERROR_##a], \
2270 foreach_notrace_ip4_arp_error;
2275 VLIB_INIT_FUNCTION (arp_notrace_init);
2278 /* Send an ARP request to see if given destination is reachable on given interface. */
2280 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2282 vnet_main_t *vnm = vnet_get_main ();
2283 ip4_main_t *im = &ip4_main;
2284 ethernet_arp_header_t *h;
2286 ip_interface_address_t *ia;
2287 ip_adjacency_t *adj;
2288 vnet_hw_interface_t *hi;
2289 vnet_sw_interface_t *si;
2294 si = vnet_get_sw_interface (vnm, sw_if_index);
2296 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2298 return clib_error_return (0, "%U: interface %U down",
2299 format_ip4_address, dst,
2300 format_vnet_sw_if_index_name, vnm,
2305 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2308 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2309 return clib_error_return
2311 "no matching interface address for destination %U (interface %U)",
2312 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2316 ip46_address_t nh = {
2320 ai = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
2321 VNET_LINK_IP4, &nh, sw_if_index);
2324 h = vlib_packet_template_get_packet (vm,
2325 &im->ip4_arp_request_packet_template,
2328 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2329 if (PREDICT_FALSE (!hi->hw_address))
2331 return clib_error_return (0, "%U: interface %U do not support ip probe",
2332 format_ip4_address, dst,
2333 format_vnet_sw_if_index_name, vnm,
2337 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2338 sizeof (h->ip4_over_ethernet[0].ethernet));
2340 h->ip4_over_ethernet[0].ip4 = src[0];
2341 h->ip4_over_ethernet[1].ip4 = dst[0];
2343 b = vlib_get_buffer (vm, bi);
2344 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2345 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2347 /* Add encapsulation string for software interface (e.g. ethernet header). */
2348 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2349 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2352 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2353 u32 *to_next = vlib_frame_vector_args (f);
2356 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2360 return /* no error */ 0;
2365 IP4_REWRITE_NEXT_DROP,
2366 IP4_REWRITE_NEXT_ICMP_ERROR,
2367 } ip4_rewrite_next_t;
2370 ip4_rewrite_inline (vlib_main_t * vm,
2371 vlib_node_runtime_t * node,
2372 vlib_frame_t * frame,
2373 int do_counters, int is_midchain, int is_mcast)
2375 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2376 u32 *from = vlib_frame_vector_args (frame);
2377 u32 n_left_from, n_left_to_next, *to_next, next_index;
2378 vlib_node_runtime_t *error_node =
2379 vlib_node_get_runtime (vm, ip4_input_node.index);
2381 n_left_from = frame->n_vectors;
2382 next_index = node->cached_next_index;
2383 u32 thread_index = vlib_get_thread_index ();
2385 while (n_left_from > 0)
2387 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2389 while (n_left_from >= 4 && n_left_to_next >= 2)
2391 ip_adjacency_t *adj0, *adj1;
2392 vlib_buffer_t *p0, *p1;
2393 ip4_header_t *ip0, *ip1;
2394 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2395 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2396 u32 tx_sw_if_index0, tx_sw_if_index1;
2398 /* Prefetch next iteration. */
2400 vlib_buffer_t *p2, *p3;
2402 p2 = vlib_get_buffer (vm, from[2]);
2403 p3 = vlib_get_buffer (vm, from[3]);
2405 vlib_prefetch_buffer_header (p2, STORE);
2406 vlib_prefetch_buffer_header (p3, STORE);
2408 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2409 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2412 pi0 = to_next[0] = from[0];
2413 pi1 = to_next[1] = from[1];
2418 n_left_to_next -= 2;
2420 p0 = vlib_get_buffer (vm, pi0);
2421 p1 = vlib_get_buffer (vm, pi1);
2423 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2424 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2427 * pre-fetch the per-adjacency counters
2431 vlib_prefetch_combined_counter (&adjacency_counters,
2432 thread_index, adj_index0);
2433 vlib_prefetch_combined_counter (&adjacency_counters,
2434 thread_index, adj_index1);
2437 ip0 = vlib_buffer_get_current (p0);
2438 ip1 = vlib_buffer_get_current (p1);
2440 error0 = error1 = IP4_ERROR_NONE;
2441 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2443 /* Decrement TTL & update checksum.
2444 Works either endian, so no need for byte swap. */
2445 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2447 i32 ttl0 = ip0->ttl;
2449 /* Input node should have reject packets with ttl 0. */
2450 ASSERT (ip0->ttl > 0);
2452 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2453 checksum0 += checksum0 >= 0xffff;
2455 ip0->checksum = checksum0;
2460 * If the ttl drops below 1 when forwarding, generate
2463 if (PREDICT_FALSE (ttl0 <= 0))
2465 error0 = IP4_ERROR_TIME_EXPIRED;
2466 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2467 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2468 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2470 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2473 /* Verify checksum. */
2474 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2475 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2479 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2481 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2483 i32 ttl1 = ip1->ttl;
2485 /* Input node should have reject packets with ttl 0. */
2486 ASSERT (ip1->ttl > 0);
2488 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2489 checksum1 += checksum1 >= 0xffff;
2491 ip1->checksum = checksum1;
2496 * If the ttl drops below 1 when forwarding, generate
2499 if (PREDICT_FALSE (ttl1 <= 0))
2501 error1 = IP4_ERROR_TIME_EXPIRED;
2502 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2503 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2504 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2506 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2509 /* Verify checksum. */
2510 ASSERT ((ip1->checksum == ip4_header_checksum (ip1)) ||
2511 (p1->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2515 p1->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2518 /* Rewrite packet header and updates lengths. */
2519 adj0 = adj_get (adj_index0);
2520 adj1 = adj_get (adj_index1);
2522 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2523 rw_len0 = adj0[0].rewrite_header.data_bytes;
2524 rw_len1 = adj1[0].rewrite_header.data_bytes;
2525 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2526 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2528 /* Check MTU of outgoing interface. */
2530 (vlib_buffer_length_in_chain (vm, p0) >
2532 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2535 (vlib_buffer_length_in_chain (vm, p1) >
2537 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2540 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2541 * to see the IP headerr */
2542 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2544 next0 = adj0[0].rewrite_header.next_index;
2545 p0->current_data -= rw_len0;
2546 p0->current_length += rw_len0;
2547 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2548 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2551 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2552 vnet_feature_arc_start (lm->output_feature_arc_index,
2553 tx_sw_if_index0, &next0, p0);
2555 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2557 next1 = adj1[0].rewrite_header.next_index;
2558 p1->current_data -= rw_len1;
2559 p1->current_length += rw_len1;
2561 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2562 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2565 (adj1[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2566 vnet_feature_arc_start (lm->output_feature_arc_index,
2567 tx_sw_if_index1, &next1, p1);
2570 /* Guess we are only writing on simple Ethernet header. */
2571 vnet_rewrite_two_headers (adj0[0], adj1[0],
2572 ip0, ip1, sizeof (ethernet_header_t));
2575 * Bump the per-adjacency counters
2579 vlib_increment_combined_counter
2580 (&adjacency_counters,
2583 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2585 vlib_increment_combined_counter
2586 (&adjacency_counters,
2589 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2594 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2595 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2600 * copy bytes from the IP address into the MAC rewrite
2602 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2603 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1);
2606 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2607 to_next, n_left_to_next,
2608 pi0, pi1, next0, next1);
2611 while (n_left_from > 0 && n_left_to_next > 0)
2613 ip_adjacency_t *adj0;
2616 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2617 u32 tx_sw_if_index0;
2619 pi0 = to_next[0] = from[0];
2621 p0 = vlib_get_buffer (vm, pi0);
2623 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2625 adj0 = adj_get (adj_index0);
2627 ip0 = vlib_buffer_get_current (p0);
2629 error0 = IP4_ERROR_NONE;
2630 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2632 /* Decrement TTL & update checksum. */
2633 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED)))
2635 i32 ttl0 = ip0->ttl;
2637 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2639 checksum0 += checksum0 >= 0xffff;
2641 ip0->checksum = checksum0;
2643 ASSERT (ip0->ttl > 0);
2649 ASSERT ((ip0->checksum == ip4_header_checksum (ip0)) ||
2650 (p0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM));
2652 if (PREDICT_FALSE (ttl0 <= 0))
2655 * If the ttl drops below 1 when forwarding, generate
2658 error0 = IP4_ERROR_TIME_EXPIRED;
2659 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2660 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2661 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2662 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2668 p0->flags &= ~VNET_BUFFER_F_LOCALLY_ORIGINATED;
2672 vlib_prefetch_combined_counter (&adjacency_counters,
2673 thread_index, adj_index0);
2675 /* Guess we are only writing on simple Ethernet header. */
2676 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2680 * copy bytes from the IP address into the MAC rewrite
2682 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0);
2685 /* Update packet buffer attributes/set output interface. */
2686 rw_len0 = adj0[0].rewrite_header.data_bytes;
2687 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2690 vlib_increment_combined_counter
2691 (&adjacency_counters,
2692 thread_index, adj_index0, 1,
2693 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2695 /* Check MTU of outgoing interface. */
2696 error0 = (vlib_buffer_length_in_chain (vm, p0)
2697 > adj0[0].rewrite_header.max_l3_packet_bytes
2698 ? IP4_ERROR_MTU_EXCEEDED : error0);
2700 p0->error = error_node->errors[error0];
2702 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2703 * to see the IP headerr */
2704 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2706 p0->current_data -= rw_len0;
2707 p0->current_length += rw_len0;
2708 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2710 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2711 next0 = adj0[0].rewrite_header.next_index;
2715 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2719 (adj0[0].rewrite_header.flags & VNET_REWRITE_HAS_FEATURES))
2720 vnet_feature_arc_start (lm->output_feature_arc_index,
2721 tx_sw_if_index0, &next0, p0);
2728 n_left_to_next -= 1;
2730 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2731 to_next, n_left_to_next,
2735 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2738 /* Need to do trace after rewrites to pick up new packet data. */
2739 if (node->flags & VLIB_NODE_FLAG_TRACE)
2740 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2742 return frame->n_vectors;
2746 /** @brief IPv4 rewrite node.
2749 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2750 header checksum, fetch the ip adjacency, check the outbound mtu,
2751 apply the adjacency rewrite, and send pkts to the adjacency
2752 rewrite header's rewrite_next_index.
2754 @param vm vlib_main_t corresponding to the current thread
2755 @param node vlib_node_runtime_t
2756 @param frame vlib_frame_t whose contents should be dispatched
2758 @par Graph mechanics: buffer metadata, next index usage
2761 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2762 - the rewrite adjacency index
2763 - <code>adj->lookup_next_index</code>
2764 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2765 the packet will be dropped.
2766 - <code>adj->rewrite_header</code>
2767 - Rewrite string length, rewrite string, next_index
2770 - <code>b->current_data, b->current_length</code>
2771 - Updated net of applying the rewrite string
2773 <em>Next Indices:</em>
2774 - <code> adj->rewrite_header.next_index </code>
2778 ip4_rewrite (vlib_main_t * vm,
2779 vlib_node_runtime_t * node, vlib_frame_t * frame)
2781 if (adj_are_counters_enabled ())
2782 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2784 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2788 ip4_midchain (vlib_main_t * vm,
2789 vlib_node_runtime_t * node, vlib_frame_t * frame)
2791 if (adj_are_counters_enabled ())
2792 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2794 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2798 ip4_rewrite_mcast (vlib_main_t * vm,
2799 vlib_node_runtime_t * node, vlib_frame_t * frame)
2801 if (adj_are_counters_enabled ())
2802 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2804 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2808 ip4_mcast_midchain (vlib_main_t * vm,
2809 vlib_node_runtime_t * node, vlib_frame_t * frame)
2811 if (adj_are_counters_enabled ())
2812 return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
2814 return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
2818 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2819 .function = ip4_rewrite,
2820 .name = "ip4-rewrite",
2821 .vector_size = sizeof (u32),
2823 .format_trace = format_ip4_rewrite_trace,
2827 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2828 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2831 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2833 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2834 .function = ip4_rewrite_mcast,
2835 .name = "ip4-rewrite-mcast",
2836 .vector_size = sizeof (u32),
2838 .format_trace = format_ip4_rewrite_trace,
2839 .sibling_of = "ip4-rewrite",
2841 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2843 VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
2844 .function = ip4_mcast_midchain,
2845 .name = "ip4-mcast-midchain",
2846 .vector_size = sizeof (u32),
2848 .format_trace = format_ip4_rewrite_trace,
2849 .sibling_of = "ip4-rewrite",
2851 VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
2853 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2854 .function = ip4_midchain,
2855 .name = "ip4-midchain",
2856 .vector_size = sizeof (u32),
2857 .format_trace = format_ip4_forward_next_trace,
2858 .sibling_of = "ip4-rewrite",
2860 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2863 static clib_error_t *
2864 add_del_interface_table (vlib_main_t * vm,
2865 unformat_input_t * input, vlib_cli_command_t * cmd)
2867 vnet_main_t *vnm = vnet_get_main ();
2868 ip_interface_address_t *ia;
2869 clib_error_t *error = 0;
2870 u32 sw_if_index, table_id;
2874 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2876 error = clib_error_return (0, "unknown interface `%U'",
2877 format_unformat_error, input);
2881 if (unformat (input, "%d", &table_id))
2885 error = clib_error_return (0, "expected table id `%U'",
2886 format_unformat_error, input);
2891 * If the interface already has in IP address, then a change int
2892 * VRF is not allowed. The IP address applied must first be removed.
2893 * We do not do that automatically here, since VPP has no knowledge
2894 * of whether thoses subnets are valid in the destination VRF.
2897 foreach_ip_interface_address (&ip4_main.lookup_main,
2899 1 /* honor unnumbered */,
2903 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2904 error = clib_error_return (0, "interface %U has address %U",
2905 format_vnet_sw_if_index_name, vnm,
2907 format_ip4_address, a);
2913 ip4_main_t *im = &ip4_main;
2916 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2918 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2919 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2921 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2922 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2923 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2931 * Place the indicated interface into the supplied IPv4 FIB table (also known
2932 * as a VRF). If the FIB table does not exist, this command creates it. To
2933 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2934 * FIB table will only be displayed if a route has been added to the table, or
2935 * an IP Address is assigned to an interface in the table (which adds a route
2938 * @note IP addresses added after setting the interface IP table are added to
2939 * the indicated FIB table. If an IP address is added prior to changing the
2940 * table then this is an error. The control plane must remove these addresses
2941 * first and then change the table. VPP will not automatically move the
2942 * addresses from the old to the new table as it does not know the validity
2946 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2947 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2950 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2952 .path = "set interface ip table",
2953 .function = add_del_interface_table,
2954 .short_help = "set interface ip table <interface> <table-id>",
2959 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2961 ip4_fib_mtrie_t *mtrie0;
2962 ip4_fib_mtrie_leaf_t leaf0;
2965 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2967 leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
2968 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2969 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2971 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2973 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2976 static clib_error_t *
2977 test_lookup_command_fn (vlib_main_t * vm,
2978 unformat_input_t * input, vlib_cli_command_t * cmd)
2985 ip4_address_t ip4_base_address;
2988 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2990 if (unformat (input, "table %d", &table_id))
2992 /* Make sure the entry exists. */
2993 fib = ip4_fib_get (table_id);
2994 if ((fib) && (fib->index != table_id))
2995 return clib_error_return (0, "<fib-index> %d does not exist",
2998 else if (unformat (input, "count %f", &count))
3001 else if (unformat (input, "%U",
3002 unformat_ip4_address, &ip4_base_address))
3005 return clib_error_return (0, "unknown input `%U'",
3006 format_unformat_error, input);
3011 for (i = 0; i < n; i++)
3013 if (!ip4_lookup_validate (&ip4_base_address, table_id))
3016 ip4_base_address.as_u32 =
3017 clib_host_to_net_u32 (1 +
3018 clib_net_to_host_u32 (ip4_base_address.as_u32));
3022 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
3024 vlib_cli_output (vm, "No errors in %d lookups\n", n);
3030 * Perform a lookup of an IPv4 Address (or range of addresses) in the
3031 * given FIB table to determine if there is a conflict with the
3032 * adjacency table. The fib-id can be determined by using the
3033 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
3036 * @todo This command uses fib-id, other commands use table-id (not
3037 * just a name, they are different indexes). Would like to change this
3038 * to table-id for consistency.
3041 * Example of how to run the test lookup command:
3042 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
3043 * No errors in 2 lookups
3047 VLIB_CLI_COMMAND (lookup_test_command, static) =
3049 .path = "test lookup",
3050 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
3051 .function = test_lookup_command_fn,
3056 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
3060 fib_index = fib_table_find (FIB_PROTOCOL_IP4, table_id);
3062 if (~0 == fib_index)
3063 return VNET_API_ERROR_NO_SUCH_FIB;
3065 fib_table_set_flow_hash_config (fib_index, FIB_PROTOCOL_IP4,
3071 static clib_error_t *
3072 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3073 unformat_input_t * input,
3074 vlib_cli_command_t * cmd)
3078 u32 flow_hash_config = 0;
3081 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3083 if (unformat (input, "table %d", &table_id))
3086 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3087 foreach_flow_hash_bit
3094 return clib_error_return (0, "unknown input `%U'",
3095 format_unformat_error, input);
3097 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3103 case VNET_API_ERROR_NO_SUCH_FIB:
3104 return clib_error_return (0, "no such FIB table %d", table_id);
3107 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3115 * Configure the set of IPv4 fields used by the flow hash.
3118 * Example of how to set the flow hash on a given table:
3119 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3120 * Example of display the configured flow hash:
3121 * @cliexstart{show ip fib}
3122 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3125 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3126 * [0] [@0]: dpo-drop ip6
3129 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3130 * [0] [@0]: dpo-drop ip6
3133 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3134 * [0] [@0]: dpo-drop ip6
3137 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3138 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3141 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3142 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3143 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3144 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3145 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3148 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3149 * [0] [@0]: dpo-drop ip6
3150 * 255.255.255.255/32
3152 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3153 * [0] [@0]: dpo-drop ip6
3154 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3157 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3158 * [0] [@0]: dpo-drop ip6
3161 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3162 * [0] [@0]: dpo-drop ip6
3165 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3166 * [0] [@4]: ipv4-glean: af_packet0
3169 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3170 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3173 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3174 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3177 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3178 * [0] [@4]: ipv4-glean: af_packet1
3181 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3182 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3185 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3186 * [0] [@0]: dpo-drop ip6
3189 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3190 * [0] [@0]: dpo-drop ip6
3191 * 255.255.255.255/32
3193 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3194 * [0] [@0]: dpo-drop ip6
3198 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3200 .path = "set ip flow-hash",
3202 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3203 .function = set_ip_flow_hash_command_fn,
3208 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3211 vnet_main_t *vnm = vnet_get_main ();
3212 vnet_interface_main_t *im = &vnm->interface_main;
3213 ip4_main_t *ipm = &ip4_main;
3214 ip_lookup_main_t *lm = &ipm->lookup_main;
3215 vnet_classify_main_t *cm = &vnet_classify_main;
3216 ip4_address_t *if_addr;
3218 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3219 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3221 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3222 return VNET_API_ERROR_NO_SUCH_ENTRY;
3224 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3225 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3227 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3229 if (NULL != if_addr)
3231 fib_prefix_t pfx = {
3233 .fp_proto = FIB_PROTOCOL_IP4,
3234 .fp_addr.ip4 = *if_addr,
3238 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3242 if (table_index != (u32) ~ 0)
3244 dpo_id_t dpo = DPO_INVALID;
3249 classify_dpo_create (DPO_PROTO_IP4, table_index));
3251 fib_table_entry_special_dpo_add (fib_index,
3253 FIB_SOURCE_CLASSIFY,
3254 FIB_ENTRY_FLAG_NONE, &dpo);
3259 fib_table_entry_special_remove (fib_index,
3260 &pfx, FIB_SOURCE_CLASSIFY);
3267 static clib_error_t *
3268 set_ip_classify_command_fn (vlib_main_t * vm,
3269 unformat_input_t * input,
3270 vlib_cli_command_t * cmd)
3272 u32 table_index = ~0;
3273 int table_index_set = 0;
3274 u32 sw_if_index = ~0;
3277 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3279 if (unformat (input, "table-index %d", &table_index))
3280 table_index_set = 1;
3281 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3282 vnet_get_main (), &sw_if_index))
3288 if (table_index_set == 0)
3289 return clib_error_return (0, "classify table-index must be specified");
3291 if (sw_if_index == ~0)
3292 return clib_error_return (0, "interface / subif must be specified");
3294 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3301 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3302 return clib_error_return (0, "No such interface");
3304 case VNET_API_ERROR_NO_SUCH_ENTRY:
3305 return clib_error_return (0, "No such classifier table");
3311 * Assign a classification table to an interface. The classification
3312 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3313 * commands. Once the table is create, use this command to filter packets
3317 * Example of how to assign a classification table to an interface:
3318 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3321 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3323 .path = "set ip classify",
3325 "set ip classify intfc <interface> table-index <classify-idx>",
3326 .function = set_ip_classify_command_fn,
3331 * fd.io coding-style-patch-verification: ON
3334 * eval: (c-set-style "gnu")