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/classify_dpo.h>
53 #include <vnet/mfib/mfib_table.h> /* for mFIB table and entry creation */
57 * @brief IPv4 Forwarding.
59 * This file contains the source code for IPv4 forwarding.
63 ip4_forward_next_trace (vlib_main_t * vm,
64 vlib_node_runtime_t * node,
66 vlib_rx_or_tx_t which_adj_index);
69 ip4_lookup_inline (vlib_main_t * vm,
70 vlib_node_runtime_t * node,
72 int lookup_for_responses_to_locally_received_packets)
74 ip4_main_t *im = &ip4_main;
75 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
76 u32 n_left_from, n_left_to_next, *from, *to_next;
77 ip_lookup_next_t next;
78 u32 cpu_index = os_get_cpu_number ();
80 from = vlib_frame_vector_args (frame);
81 n_left_from = frame->n_vectors;
82 next = node->cached_next_index;
84 while (n_left_from > 0)
86 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
88 while (n_left_from >= 8 && n_left_to_next >= 4)
90 vlib_buffer_t *p0, *p1, *p2, *p3;
91 ip4_header_t *ip0, *ip1, *ip2, *ip3;
92 __attribute__ ((unused)) tcp_header_t *tcp0, *tcp1, *tcp2, *tcp3;
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 __attribute__ ((unused)) u32 pi0, fib_index0, lb_index0,
100 __attribute__ ((unused)) u32 pi1, fib_index1, lb_index1,
102 __attribute__ ((unused)) u32 pi2, fib_index2, lb_index2,
104 __attribute__ ((unused)) u32 pi3, fib_index3, lb_index3,
106 flow_hash_config_t flow_hash_config0, flow_hash_config1;
107 flow_hash_config_t flow_hash_config2, flow_hash_config3;
108 u32 hash_c0, hash_c1, hash_c2, hash_c3;
109 const dpo_id_t *dpo0, *dpo1, *dpo2, *dpo3;
111 /* Prefetch next iteration. */
113 vlib_buffer_t *p4, *p5, *p6, *p7;
115 p4 = vlib_get_buffer (vm, from[4]);
116 p5 = vlib_get_buffer (vm, from[5]);
117 p6 = vlib_get_buffer (vm, from[6]);
118 p7 = vlib_get_buffer (vm, from[7]);
120 vlib_prefetch_buffer_header (p4, LOAD);
121 vlib_prefetch_buffer_header (p5, LOAD);
122 vlib_prefetch_buffer_header (p6, LOAD);
123 vlib_prefetch_buffer_header (p7, LOAD);
125 CLIB_PREFETCH (p4->data, sizeof (ip0[0]), LOAD);
126 CLIB_PREFETCH (p5->data, sizeof (ip0[0]), LOAD);
127 CLIB_PREFETCH (p6->data, sizeof (ip0[0]), LOAD);
128 CLIB_PREFETCH (p7->data, sizeof (ip0[0]), LOAD);
131 pi0 = to_next[0] = from[0];
132 pi1 = to_next[1] = from[1];
133 pi2 = to_next[2] = from[2];
134 pi3 = to_next[3] = from[3];
141 p0 = vlib_get_buffer (vm, pi0);
142 p1 = vlib_get_buffer (vm, pi1);
143 p2 = vlib_get_buffer (vm, pi2);
144 p3 = vlib_get_buffer (vm, pi3);
146 ip0 = vlib_buffer_get_current (p0);
147 ip1 = vlib_buffer_get_current (p1);
148 ip2 = vlib_buffer_get_current (p2);
149 ip3 = vlib_buffer_get_current (p3);
151 dst_addr0 = &ip0->dst_address;
152 dst_addr1 = &ip1->dst_address;
153 dst_addr2 = &ip2->dst_address;
154 dst_addr3 = &ip3->dst_address;
157 vec_elt (im->fib_index_by_sw_if_index,
158 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
160 vec_elt (im->fib_index_by_sw_if_index,
161 vnet_buffer (p1)->sw_if_index[VLIB_RX]);
163 vec_elt (im->fib_index_by_sw_if_index,
164 vnet_buffer (p2)->sw_if_index[VLIB_RX]);
166 vec_elt (im->fib_index_by_sw_if_index,
167 vnet_buffer (p3)->sw_if_index[VLIB_RX]);
169 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
170 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
172 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
173 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
175 (vnet_buffer (p2)->sw_if_index[VLIB_TX] ==
176 (u32) ~ 0) ? fib_index2 : vnet_buffer (p2)->sw_if_index[VLIB_TX];
178 (vnet_buffer (p3)->sw_if_index[VLIB_TX] ==
179 (u32) ~ 0) ? fib_index3 : vnet_buffer (p3)->sw_if_index[VLIB_TX];
182 if (!lookup_for_responses_to_locally_received_packets)
184 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
185 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
186 mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
187 mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
189 leaf0 = leaf1 = leaf2 = leaf3 = IP4_FIB_MTRIE_LEAF_ROOT;
191 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 0);
192 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 0);
193 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 0);
194 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 0);
197 tcp0 = (void *) (ip0 + 1);
198 tcp1 = (void *) (ip1 + 1);
199 tcp2 = (void *) (ip2 + 1);
200 tcp3 = (void *) (ip3 + 1);
202 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
203 || ip0->protocol == IP_PROTOCOL_UDP);
204 is_tcp_udp1 = (ip1->protocol == IP_PROTOCOL_TCP
205 || ip1->protocol == IP_PROTOCOL_UDP);
206 is_tcp_udp2 = (ip2->protocol == IP_PROTOCOL_TCP
207 || ip2->protocol == IP_PROTOCOL_UDP);
208 is_tcp_udp3 = (ip1->protocol == IP_PROTOCOL_TCP
209 || ip1->protocol == IP_PROTOCOL_UDP);
211 if (!lookup_for_responses_to_locally_received_packets)
213 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
214 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 1);
215 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 1);
216 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 1);
219 if (!lookup_for_responses_to_locally_received_packets)
221 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
222 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
223 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
224 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 2);
227 if (!lookup_for_responses_to_locally_received_packets)
229 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
230 leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 3);
231 leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 3);
232 leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 3);
235 if (lookup_for_responses_to_locally_received_packets)
237 lb_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
238 lb_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_RX];
239 lb_index2 = vnet_buffer (p2)->ip.adj_index[VLIB_RX];
240 lb_index3 = vnet_buffer (p3)->ip.adj_index[VLIB_RX];
244 /* Handle default route. */
247 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
250 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie1->default_leaf : leaf1);
253 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie2->default_leaf : leaf2);
256 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie3->default_leaf : leaf3);
257 lb_index0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
258 lb_index1 = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
259 lb_index2 = ip4_fib_mtrie_leaf_get_adj_index (leaf2);
260 lb_index3 = ip4_fib_mtrie_leaf_get_adj_index (leaf3);
263 lb0 = load_balance_get (lb_index0);
264 lb1 = load_balance_get (lb_index1);
265 lb2 = load_balance_get (lb_index2);
266 lb3 = load_balance_get (lb_index3);
268 /* Use flow hash to compute multipath adjacency. */
269 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
270 hash_c1 = vnet_buffer (p1)->ip.flow_hash = 0;
271 hash_c2 = vnet_buffer (p2)->ip.flow_hash = 0;
272 hash_c3 = vnet_buffer (p3)->ip.flow_hash = 0;
273 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
275 flow_hash_config0 = lb0->lb_hash_config;
276 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
277 ip4_compute_flow_hash (ip0, flow_hash_config0);
279 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
281 flow_hash_config1 = lb1->lb_hash_config;
282 hash_c1 = vnet_buffer (p1)->ip.flow_hash =
283 ip4_compute_flow_hash (ip1, flow_hash_config1);
285 if (PREDICT_FALSE (lb2->lb_n_buckets > 1))
287 flow_hash_config2 = lb2->lb_hash_config;
288 hash_c2 = vnet_buffer (p2)->ip.flow_hash =
289 ip4_compute_flow_hash (ip2, flow_hash_config2);
291 if (PREDICT_FALSE (lb3->lb_n_buckets > 1))
293 flow_hash_config3 = lb3->lb_hash_config;
294 hash_c3 = vnet_buffer (p3)->ip.flow_hash =
295 ip4_compute_flow_hash (ip3, flow_hash_config3);
298 ASSERT (lb0->lb_n_buckets > 0);
299 ASSERT (is_pow2 (lb0->lb_n_buckets));
300 ASSERT (lb1->lb_n_buckets > 0);
301 ASSERT (is_pow2 (lb1->lb_n_buckets));
302 ASSERT (lb2->lb_n_buckets > 0);
303 ASSERT (is_pow2 (lb2->lb_n_buckets));
304 ASSERT (lb3->lb_n_buckets > 0);
305 ASSERT (is_pow2 (lb3->lb_n_buckets));
307 dpo0 = load_balance_get_bucket_i (lb0,
309 (lb0->lb_n_buckets_minus_1)));
310 dpo1 = load_balance_get_bucket_i (lb1,
312 (lb1->lb_n_buckets_minus_1)));
313 dpo2 = load_balance_get_bucket_i (lb2,
315 (lb2->lb_n_buckets_minus_1)));
316 dpo3 = load_balance_get_bucket_i (lb3,
318 (lb3->lb_n_buckets_minus_1)));
320 next0 = dpo0->dpoi_next_node;
321 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
322 next1 = dpo1->dpoi_next_node;
323 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
324 next2 = dpo2->dpoi_next_node;
325 vnet_buffer (p2)->ip.adj_index[VLIB_TX] = dpo2->dpoi_index;
326 next3 = dpo3->dpoi_next_node;
327 vnet_buffer (p3)->ip.adj_index[VLIB_TX] = dpo3->dpoi_index;
329 vlib_increment_combined_counter
330 (cm, cpu_index, lb_index0, 1,
331 vlib_buffer_length_in_chain (vm, p0)
332 + sizeof (ethernet_header_t));
333 vlib_increment_combined_counter
334 (cm, cpu_index, lb_index1, 1,
335 vlib_buffer_length_in_chain (vm, p1)
336 + sizeof (ethernet_header_t));
337 vlib_increment_combined_counter
338 (cm, cpu_index, lb_index2, 1,
339 vlib_buffer_length_in_chain (vm, p2)
340 + sizeof (ethernet_header_t));
341 vlib_increment_combined_counter
342 (cm, cpu_index, lb_index3, 1,
343 vlib_buffer_length_in_chain (vm, p3)
344 + sizeof (ethernet_header_t));
346 vlib_validate_buffer_enqueue_x4 (vm, node, next,
347 to_next, n_left_to_next,
349 next0, next1, next2, next3);
352 while (n_left_from > 0 && n_left_to_next > 0)
356 __attribute__ ((unused)) tcp_header_t *tcp0;
357 ip_lookup_next_t next0;
358 const load_balance_t *lb0;
359 ip4_fib_mtrie_t *mtrie0;
360 ip4_fib_mtrie_leaf_t leaf0;
361 ip4_address_t *dst_addr0;
362 __attribute__ ((unused)) u32 pi0, fib_index0, is_tcp_udp0, lbi0;
363 flow_hash_config_t flow_hash_config0;
364 const dpo_id_t *dpo0;
370 p0 = vlib_get_buffer (vm, pi0);
372 ip0 = vlib_buffer_get_current (p0);
374 dst_addr0 = &ip0->dst_address;
377 vec_elt (im->fib_index_by_sw_if_index,
378 vnet_buffer (p0)->sw_if_index[VLIB_RX]);
380 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
381 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
383 if (!lookup_for_responses_to_locally_received_packets)
385 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
387 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
389 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 0);
392 tcp0 = (void *) (ip0 + 1);
394 is_tcp_udp0 = (ip0->protocol == IP_PROTOCOL_TCP
395 || ip0->protocol == IP_PROTOCOL_UDP);
397 if (!lookup_for_responses_to_locally_received_packets)
398 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
400 if (!lookup_for_responses_to_locally_received_packets)
401 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
403 if (!lookup_for_responses_to_locally_received_packets)
404 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 3);
406 if (lookup_for_responses_to_locally_received_packets)
407 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_RX];
410 /* Handle default route. */
413 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
414 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
417 lb0 = load_balance_get (lbi0);
419 /* Use flow hash to compute multipath adjacency. */
420 hash_c0 = vnet_buffer (p0)->ip.flow_hash = 0;
421 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
423 flow_hash_config0 = lb0->lb_hash_config;
425 hash_c0 = vnet_buffer (p0)->ip.flow_hash =
426 ip4_compute_flow_hash (ip0, flow_hash_config0);
429 ASSERT (lb0->lb_n_buckets > 0);
430 ASSERT (is_pow2 (lb0->lb_n_buckets));
432 dpo0 = load_balance_get_bucket_i (lb0,
434 (lb0->lb_n_buckets_minus_1)));
436 next0 = dpo0->dpoi_next_node;
437 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
439 vlib_increment_combined_counter
440 (cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
447 if (PREDICT_FALSE (next0 != next))
450 vlib_put_next_frame (vm, node, next, n_left_to_next);
452 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
459 vlib_put_next_frame (vm, node, next, n_left_to_next);
462 if (node->flags & VLIB_NODE_FLAG_TRACE)
463 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
465 return frame->n_vectors;
468 /** @brief IPv4 lookup node.
471 This is the main IPv4 lookup dispatch node.
473 @param vm vlib_main_t corresponding to the current thread
474 @param node vlib_node_runtime_t
475 @param frame vlib_frame_t whose contents should be dispatched
477 @par Graph mechanics: buffer metadata, next index usage
480 - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
481 - Indicates the @c sw_if_index value of the interface that the
482 packet was received on.
483 - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
484 - When the value is @c ~0 then the node performs a longest prefix
485 match (LPM) for the packet destination address in the FIB attached
486 to the receive interface.
487 - Otherwise perform LPM for the packet destination address in the
488 indicated FIB. In this case <code>[VLIB_TX]</code> is a FIB index
489 value (0, 1, ...) and not a VRF id.
492 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
493 - The lookup result adjacency index.
496 - Dispatches the packet to the node index found in
497 ip_adjacency_t @c adj->lookup_next_index
498 (where @c adj is the lookup result adjacency).
501 ip4_lookup (vlib_main_t * vm,
502 vlib_node_runtime_t * node, vlib_frame_t * frame)
504 return ip4_lookup_inline (vm, node, frame,
505 /* lookup_for_responses_to_locally_received_packets */
510 static u8 *format_ip4_lookup_trace (u8 * s, va_list * args);
512 VLIB_REGISTER_NODE (ip4_lookup_node) =
514 .function = ip4_lookup,.name = "ip4-lookup",.vector_size =
515 sizeof (u32),.format_trace = format_ip4_lookup_trace,.n_next_nodes =
516 IP_LOOKUP_N_NEXT,.next_nodes = IP4_LOOKUP_NEXT_NODES,};
518 VLIB_NODE_FUNCTION_MULTIARCH (ip4_lookup_node, ip4_lookup);
521 ip4_load_balance (vlib_main_t * vm,
522 vlib_node_runtime_t * node, vlib_frame_t * frame)
524 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_via_counters;
525 u32 n_left_from, n_left_to_next, *from, *to_next;
526 ip_lookup_next_t next;
527 u32 cpu_index = os_get_cpu_number ();
529 from = vlib_frame_vector_args (frame);
530 n_left_from = frame->n_vectors;
531 next = node->cached_next_index;
533 if (node->flags & VLIB_NODE_FLAG_TRACE)
534 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
536 while (n_left_from > 0)
538 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
541 while (n_left_from >= 4 && n_left_to_next >= 2)
543 ip_lookup_next_t next0, next1;
544 const load_balance_t *lb0, *lb1;
545 vlib_buffer_t *p0, *p1;
546 u32 pi0, lbi0, hc0, pi1, lbi1, hc1;
547 const ip4_header_t *ip0, *ip1;
548 const dpo_id_t *dpo0, *dpo1;
550 /* Prefetch next iteration. */
552 vlib_buffer_t *p2, *p3;
554 p2 = vlib_get_buffer (vm, from[2]);
555 p3 = vlib_get_buffer (vm, from[3]);
557 vlib_prefetch_buffer_header (p2, STORE);
558 vlib_prefetch_buffer_header (p3, STORE);
560 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
561 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
564 pi0 = to_next[0] = from[0];
565 pi1 = to_next[1] = from[1];
572 p0 = vlib_get_buffer (vm, pi0);
573 p1 = vlib_get_buffer (vm, pi1);
575 ip0 = vlib_buffer_get_current (p0);
576 ip1 = vlib_buffer_get_current (p1);
577 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
578 lbi1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
580 lb0 = load_balance_get (lbi0);
581 lb1 = load_balance_get (lbi1);
584 * this node is for via FIBs we can re-use the hash value from the
585 * to node if present.
586 * We don't want to use the same hash value at each level in the recursion
587 * graph as that would lead to polarisation
591 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
593 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
595 hc0 = vnet_buffer (p0)->ip.flow_hash =
596 vnet_buffer (p0)->ip.flow_hash >> 1;
600 hc0 = vnet_buffer (p0)->ip.flow_hash =
601 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
604 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
606 if (PREDICT_TRUE (vnet_buffer (p1)->ip.flow_hash))
608 hc1 = vnet_buffer (p1)->ip.flow_hash =
609 vnet_buffer (p1)->ip.flow_hash >> 1;
613 hc1 = vnet_buffer (p1)->ip.flow_hash =
614 ip4_compute_flow_hash (ip1, lb1->lb_hash_config);
619 load_balance_get_bucket_i (lb0,
620 hc0 & (lb0->lb_n_buckets_minus_1));
622 load_balance_get_bucket_i (lb1,
623 hc1 & (lb1->lb_n_buckets_minus_1));
625 next0 = dpo0->dpoi_next_node;
626 next1 = dpo1->dpoi_next_node;
628 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
629 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
631 vlib_increment_combined_counter
632 (cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
633 vlib_increment_combined_counter
634 (cm, cpu_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
636 vlib_validate_buffer_enqueue_x2 (vm, node, next,
637 to_next, n_left_to_next,
638 pi0, pi1, next0, next1);
641 while (n_left_from > 0 && n_left_to_next > 0)
643 ip_lookup_next_t next0;
644 const load_balance_t *lb0;
647 const ip4_header_t *ip0;
648 const dpo_id_t *dpo0;
657 p0 = vlib_get_buffer (vm, pi0);
659 ip0 = vlib_buffer_get_current (p0);
660 lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
662 lb0 = load_balance_get (lbi0);
665 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
667 if (PREDICT_TRUE (vnet_buffer (p0)->ip.flow_hash))
669 hc0 = vnet_buffer (p0)->ip.flow_hash =
670 vnet_buffer (p0)->ip.flow_hash >> 1;
674 hc0 = vnet_buffer (p0)->ip.flow_hash =
675 ip4_compute_flow_hash (ip0, lb0->lb_hash_config);
680 load_balance_get_bucket_i (lb0,
681 hc0 & (lb0->lb_n_buckets_minus_1));
683 next0 = dpo0->dpoi_next_node;
684 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
686 vlib_increment_combined_counter
687 (cm, cpu_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
689 vlib_validate_buffer_enqueue_x1 (vm, node, next,
690 to_next, n_left_to_next,
694 vlib_put_next_frame (vm, node, next, n_left_to_next);
697 return frame->n_vectors;
700 VLIB_REGISTER_NODE (ip4_load_balance_node) =
702 .function = ip4_load_balance,.name = "ip4-load-balance",.vector_size =
703 sizeof (u32),.sibling_of = "ip4-lookup",.format_trace =
704 format_ip4_lookup_trace,};
706 VLIB_NODE_FUNCTION_MULTIARCH (ip4_load_balance_node, ip4_load_balance);
708 /* get first interface address */
710 ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
711 ip_interface_address_t ** result_ia)
713 ip_lookup_main_t *lm = &im->lookup_main;
714 ip_interface_address_t *ia = 0;
715 ip4_address_t *result = 0;
718 foreach_ip_interface_address
719 (lm, ia, sw_if_index,
720 1 /* honor unnumbered */ ,
723 ip_interface_address_get_address (lm, ia);
729 *result_ia = result ? ia : 0;
734 ip4_add_interface_routes (u32 sw_if_index,
735 ip4_main_t * im, u32 fib_index,
736 ip_interface_address_t * a)
738 ip_lookup_main_t *lm = &im->lookup_main;
739 ip4_address_t *address = ip_interface_address_get_address (lm, a);
741 .fp_len = a->address_length,
742 .fp_proto = FIB_PROTOCOL_IP4,
743 .fp_addr.ip4 = *address,
746 a->neighbor_probe_adj_index = ~0;
750 fib_node_index_t fei;
752 fei = fib_table_entry_update_one_path (fib_index, &pfx,
753 FIB_SOURCE_INTERFACE,
754 (FIB_ENTRY_FLAG_CONNECTED |
755 FIB_ENTRY_FLAG_ATTACHED),
757 /* No next-hop address */
763 // no out-label stack
765 FIB_ROUTE_PATH_FLAG_NONE);
766 a->neighbor_probe_adj_index = fib_entry_get_adj (fei);
771 if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
773 u32 classify_table_index =
774 lm->classify_table_index_by_sw_if_index[sw_if_index];
775 if (classify_table_index != (u32) ~ 0)
777 dpo_id_t dpo = DPO_INVALID;
782 classify_dpo_create (DPO_PROTO_IP4, classify_table_index));
784 fib_table_entry_special_dpo_add (fib_index,
787 FIB_ENTRY_FLAG_NONE, &dpo);
792 fib_table_entry_update_one_path (fib_index, &pfx,
793 FIB_SOURCE_INTERFACE,
794 (FIB_ENTRY_FLAG_CONNECTED |
795 FIB_ENTRY_FLAG_LOCAL),
802 FIB_ROUTE_PATH_FLAG_NONE);
806 ip4_del_interface_routes (ip4_main_t * im,
808 ip4_address_t * address, u32 address_length)
811 .fp_len = address_length,
812 .fp_proto = FIB_PROTOCOL_IP4,
813 .fp_addr.ip4 = *address,
818 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
822 fib_table_entry_delete (fib_index, &pfx, FIB_SOURCE_INTERFACE);
826 ip4_sw_interface_enable_disable (u32 sw_if_index, u32 is_enable)
828 ip4_main_t *im = &ip4_main;
830 vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
833 * enable/disable only on the 1<->0 transition
837 if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
842 ASSERT (im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
843 if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
846 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
850 vnet_feature_enable_disable ("ip4-multicast",
851 "ip4-mfib-forward-lookup",
852 sw_if_index, is_enable, 0, 0);
855 static clib_error_t *
856 ip4_add_del_interface_address_internal (vlib_main_t * vm,
858 ip4_address_t * address,
859 u32 address_length, u32 is_del)
861 vnet_main_t *vnm = vnet_get_main ();
862 ip4_main_t *im = &ip4_main;
863 ip_lookup_main_t *lm = &im->lookup_main;
864 clib_error_t *error = 0;
865 u32 if_address_index, elts_before;
866 ip4_address_fib_t ip4_af, *addr_fib = 0;
868 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
869 ip4_addr_fib_init (&ip4_af, address,
870 vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
871 vec_add1 (addr_fib, ip4_af);
874 * there is no support for adj-fib handling in the presence of overlapping
875 * subnets on interfaces. Easy fix - disallow overlapping subnets, like
881 /* When adding an address check that it does not conflict
882 with an existing address. */
883 ip_interface_address_t *ia;
884 foreach_ip_interface_address
885 (&im->lookup_main, ia, sw_if_index,
886 0 /* honor unnumbered */ ,
889 ip_interface_address_get_address
890 (&im->lookup_main, ia);
891 if (ip4_destination_matches_route
892 (im, address, x, ia->address_length) ||
893 ip4_destination_matches_route (im,
899 ("failed to add %U which conflicts with %U for interface %U",
900 format_ip4_address_and_length, address,
902 format_ip4_address_and_length, x,
904 format_vnet_sw_if_index_name, vnm,
910 elts_before = pool_elts (lm->if_address_pool);
912 error = ip_interface_address_add_del
913 (lm, sw_if_index, addr_fib, address_length, is_del, &if_address_index);
917 ip4_sw_interface_enable_disable (sw_if_index, !is_del);
920 ip4_del_interface_routes (im, ip4_af.fib_index, address, address_length);
922 ip4_add_interface_routes (sw_if_index,
923 im, ip4_af.fib_index,
925 (lm->if_address_pool, if_address_index));
927 /* If pool did not grow/shrink: add duplicate address. */
928 if (elts_before != pool_elts (lm->if_address_pool))
930 ip4_add_del_interface_address_callback_t *cb;
931 vec_foreach (cb, im->add_del_interface_address_callbacks)
932 cb->function (im, cb->function_opaque, sw_if_index,
933 address, address_length, if_address_index, is_del);
942 ip4_add_del_interface_address (vlib_main_t * vm,
944 ip4_address_t * address,
945 u32 address_length, u32 is_del)
947 return ip4_add_del_interface_address_internal
948 (vm, sw_if_index, address, address_length, is_del);
951 /* Built-in ip4 unicast rx feature path definition */
953 VNET_FEATURE_ARC_INIT (ip4_unicast, static) =
955 .arc_name = "ip4-unicast",
956 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
957 .end_node = "ip4-lookup",
958 .arc_index_ptr = &ip4_main.lookup_main.ucast_feature_arc_index,
961 VNET_FEATURE_INIT (ip4_flow_classify, static) =
963 .arc_name = "ip4-unicast",
964 .node_name = "ip4-flow-classify",
965 .runs_before = VNET_FEATURES ("ip4-inacl"),
968 VNET_FEATURE_INIT (ip4_inacl, static) =
970 .arc_name = "ip4-unicast",
971 .node_name = "ip4-inacl",
972 .runs_before = VNET_FEATURES ("ip4-source-check-via-rx"),
975 VNET_FEATURE_INIT (ip4_source_check_1, static) =
977 .arc_name = "ip4-unicast",
978 .node_name = "ip4-source-check-via-rx",
979 .runs_before = VNET_FEATURES ("ip4-source-check-via-any"),
982 VNET_FEATURE_INIT (ip4_source_check_2, static) =
984 .arc_name = "ip4-unicast",
985 .node_name = "ip4-source-check-via-any",
986 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
989 VNET_FEATURE_INIT (ip4_source_and_port_range_check_rx, static) =
991 .arc_name = "ip4-unicast",
992 .node_name = "ip4-source-and-port-range-check-rx",
993 .runs_before = VNET_FEATURES ("ip4-policer-classify"),
996 VNET_FEATURE_INIT (ip4_policer_classify, static) =
998 .arc_name = "ip4-unicast",
999 .node_name = "ip4-policer-classify",
1000 .runs_before = VNET_FEATURES ("ipsec-input-ip4"),
1003 VNET_FEATURE_INIT (ip4_ipsec, static) =
1005 .arc_name = "ip4-unicast",
1006 .node_name = "ipsec-input-ip4",
1007 .runs_before = VNET_FEATURES ("vpath-input-ip4"),
1010 VNET_FEATURE_INIT (ip4_vpath, static) =
1012 .arc_name = "ip4-unicast",
1013 .node_name = "vpath-input-ip4",
1014 .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
1017 VNET_FEATURE_INIT (ip4_vxlan_bypass, static) =
1019 .arc_name = "ip4-unicast",
1020 .node_name = "ip4-vxlan-bypass",
1021 .runs_before = VNET_FEATURES ("ip4-lookup"),
1024 VNET_FEATURE_INIT (ip4_lookup, static) =
1026 .arc_name = "ip4-unicast",
1027 .node_name = "ip4-lookup",
1028 .runs_before = VNET_FEATURES ("ip4-drop"),
1031 VNET_FEATURE_INIT (ip4_drop, static) =
1033 .arc_name = "ip4-unicast",
1034 .node_name = "ip4-drop",
1035 .runs_before = 0, /* not before any other features */
1039 /* Built-in ip4 multicast rx feature path definition */
1040 VNET_FEATURE_ARC_INIT (ip4_multicast, static) =
1042 .arc_name = "ip4-multicast",
1043 .start_nodes = VNET_FEATURES ("ip4-input", "ip4-input-no-checksum"),
1044 .end_node = "ip4-lookup-multicast",
1045 .arc_index_ptr = &ip4_main.lookup_main.mcast_feature_arc_index,
1048 VNET_FEATURE_INIT (ip4_vpath_mc, static) =
1050 .arc_name = "ip4-multicast",
1051 .node_name = "vpath-input-ip4",
1052 .runs_before = VNET_FEATURES ("ip4-mfib-forward-lookup"),
1055 VNET_FEATURE_INIT (ip4_lookup_mc, static) =
1057 .arc_name = "ip4-multicast",
1058 .node_name = "ip4-mfib-forward-lookup",
1059 .runs_before = VNET_FEATURES ("ip4-drop"),
1062 VNET_FEATURE_INIT (ip4_mc_drop, static) =
1064 .arc_name = "ip4-multicast",
1065 .node_name = "ip4-drop",
1066 .runs_before = 0, /* last feature */
1069 /* Source and port-range check ip4 tx feature path definition */
1070 VNET_FEATURE_ARC_INIT (ip4_output, static) =
1072 .arc_name = "ip4-output",
1073 .start_nodes = VNET_FEATURES ("ip4-rewrite", "ip4-midchain"),
1074 .end_node = "interface-output",
1075 .arc_index_ptr = &ip4_main.lookup_main.output_feature_arc_index,
1078 VNET_FEATURE_INIT (ip4_source_and_port_range_check_tx, static) =
1080 .arc_name = "ip4-output",
1081 .node_name = "ip4-source-and-port-range-check-tx",
1082 .runs_before = VNET_FEATURES ("ipsec-output-ip4"),
1085 VNET_FEATURE_INIT (ip4_ipsec_output, static) =
1087 .arc_name = "ip4-output",
1088 .node_name = "ipsec-output-ip4",
1089 .runs_before = VNET_FEATURES ("interface-output"),
1092 /* Built-in ip4 tx feature path definition */
1093 VNET_FEATURE_INIT (ip4_interface_output, static) =
1095 .arc_name = "ip4-output",
1096 .node_name = "interface-output",
1097 .runs_before = 0, /* not before any other features */
1101 static clib_error_t *
1102 ip4_sw_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add)
1104 ip4_main_t *im = &ip4_main;
1106 /* Fill in lookup tables with default table (0). */
1107 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1108 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
1110 vnet_feature_enable_disable ("ip4-unicast", "ip4-drop", sw_if_index,
1113 vnet_feature_enable_disable ("ip4-multicast", "ip4-drop", sw_if_index,
1116 return /* no error */ 0;
1119 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip4_sw_interface_add_del);
1121 /* Global IP4 main. */
1122 ip4_main_t ip4_main;
1125 ip4_lookup_init (vlib_main_t * vm)
1127 ip4_main_t *im = &ip4_main;
1128 clib_error_t *error;
1131 if ((error = vlib_call_init_function (vm, vnet_feature_init)))
1134 for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
1139 m = pow2_mask (i) << (32 - i);
1142 im->fib_masks[i] = clib_host_to_net_u32 (m);
1145 ip_lookup_init (&im->lookup_main, /* is_ip6 */ 0);
1147 /* Create FIB with index 0 and table id of 0. */
1148 fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1149 mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, 0);
1153 pn = pg_get_node (ip4_lookup_node.index);
1154 pn->unformat_edit = unformat_pg_ip4_header;
1158 ethernet_arp_header_t h;
1160 memset (&h, 0, sizeof (h));
1162 /* Set target ethernet address to all zeros. */
1163 memset (h.ip4_over_ethernet[1].ethernet, 0,
1164 sizeof (h.ip4_over_ethernet[1].ethernet));
1166 #define _16(f,v) h.f = clib_host_to_net_u16 (v);
1167 #define _8(f,v) h.f = v;
1168 _16 (l2_type, ETHERNET_ARP_HARDWARE_TYPE_ethernet);
1169 _16 (l3_type, ETHERNET_TYPE_IP4);
1170 _8 (n_l2_address_bytes, 6);
1171 _8 (n_l3_address_bytes, 4);
1172 _16 (opcode, ETHERNET_ARP_OPCODE_request);
1176 vlib_packet_template_init (vm, &im->ip4_arp_request_packet_template,
1179 /* alloc chunk size */ 8,
1186 VLIB_INIT_FUNCTION (ip4_lookup_init);
1190 /* Adjacency taken. */
1195 /* Packet data, possibly *after* rewrite. */
1196 u8 packet_data[64 - 1 * sizeof (u32)];
1198 ip4_forward_next_trace_t;
1201 format_ip4_forward_next_trace (u8 * s, va_list * args)
1203 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1204 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1205 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1206 uword indent = format_get_indent (s);
1207 s = format (s, "%U%U",
1208 format_white_space, indent,
1209 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1214 format_ip4_lookup_trace (u8 * s, va_list * args)
1216 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1217 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1218 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1219 uword indent = format_get_indent (s);
1221 s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
1222 t->fib_index, t->dpo_index, t->flow_hash);
1223 s = format (s, "\n%U%U",
1224 format_white_space, indent,
1225 format_ip4_header, t->packet_data, sizeof (t->packet_data));
1230 format_ip4_rewrite_trace (u8 * s, va_list * args)
1232 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1233 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1234 ip4_forward_next_trace_t *t = va_arg (*args, ip4_forward_next_trace_t *);
1235 vnet_main_t *vnm = vnet_get_main ();
1236 uword indent = format_get_indent (s);
1238 s = format (s, "tx_sw_if_index %d dpo-idx %d : %U flow hash: 0x%08x",
1239 t->fib_index, t->dpo_index, format_ip_adjacency,
1240 t->dpo_index, FORMAT_IP_ADJACENCY_NONE, t->flow_hash);
1241 s = format (s, "\n%U%U",
1242 format_white_space, indent,
1243 format_ip_adjacency_packet_data,
1244 vnm, t->dpo_index, t->packet_data, sizeof (t->packet_data));
1248 /* Common trace function for all ip4-forward next nodes. */
1250 ip4_forward_next_trace (vlib_main_t * vm,
1251 vlib_node_runtime_t * node,
1252 vlib_frame_t * frame, vlib_rx_or_tx_t which_adj_index)
1255 ip4_main_t *im = &ip4_main;
1257 n_left = frame->n_vectors;
1258 from = vlib_frame_vector_args (frame);
1263 vlib_buffer_t *b0, *b1;
1264 ip4_forward_next_trace_t *t0, *t1;
1266 /* Prefetch next iteration. */
1267 vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1268 vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1273 b0 = vlib_get_buffer (vm, bi0);
1274 b1 = vlib_get_buffer (vm, bi1);
1276 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1278 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1279 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1280 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1282 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1283 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1284 vec_elt (im->fib_index_by_sw_if_index,
1285 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1287 clib_memcpy (t0->packet_data,
1288 vlib_buffer_get_current (b0),
1289 sizeof (t0->packet_data));
1291 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1293 t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1294 t1->dpo_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1295 t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1297 (vnet_buffer (b1)->sw_if_index[VLIB_TX] !=
1298 (u32) ~ 0) ? vnet_buffer (b1)->sw_if_index[VLIB_TX] :
1299 vec_elt (im->fib_index_by_sw_if_index,
1300 vnet_buffer (b1)->sw_if_index[VLIB_RX]);
1301 clib_memcpy (t1->packet_data, vlib_buffer_get_current (b1),
1302 sizeof (t1->packet_data));
1312 ip4_forward_next_trace_t *t0;
1316 b0 = vlib_get_buffer (vm, bi0);
1318 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1320 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1321 t0->dpo_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1322 t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1324 (vnet_buffer (b0)->sw_if_index[VLIB_TX] !=
1325 (u32) ~ 0) ? vnet_buffer (b0)->sw_if_index[VLIB_TX] :
1326 vec_elt (im->fib_index_by_sw_if_index,
1327 vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1328 clib_memcpy (t0->packet_data, vlib_buffer_get_current (b0),
1329 sizeof (t0->packet_data));
1337 ip4_drop_or_punt (vlib_main_t * vm,
1338 vlib_node_runtime_t * node,
1339 vlib_frame_t * frame, ip4_error_t error_code)
1341 u32 *buffers = vlib_frame_vector_args (frame);
1342 uword n_packets = frame->n_vectors;
1344 vlib_error_drop_buffers (vm, node, buffers,
1348 ip4_input_node.index, error_code);
1350 if (node->flags & VLIB_NODE_FLAG_TRACE)
1351 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1357 ip4_drop (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1359 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_DROP);
1363 ip4_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1365 return ip4_drop_or_punt (vm, node, frame, IP4_ERROR_ADJACENCY_PUNT);
1369 VLIB_REGISTER_NODE (ip4_drop_node, static) =
1371 .function = ip4_drop,.
1373 .vector_size = sizeof (u32),
1374 .format_trace = format_ip4_forward_next_trace,
1381 VLIB_NODE_FUNCTION_MULTIARCH (ip4_drop_node, ip4_drop);
1383 VLIB_REGISTER_NODE (ip4_punt_node, static) =
1385 .function = ip4_punt,
1387 .vector_size = sizeof (u32),
1388 .format_trace = format_ip4_forward_next_trace,
1395 VLIB_NODE_FUNCTION_MULTIARCH (ip4_punt_node, ip4_punt);
1398 /* Compute TCP/UDP/ICMP4 checksum in software. */
1400 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
1404 u32 ip_header_length, payload_length_host_byte_order;
1405 u32 n_this_buffer, n_bytes_left;
1407 void *data_this_buffer;
1409 /* Initialize checksum with ip header. */
1410 ip_header_length = ip4_header_bytes (ip0);
1411 payload_length_host_byte_order =
1412 clib_net_to_host_u16 (ip0->length) - ip_header_length;
1414 clib_host_to_net_u32 (payload_length_host_byte_order +
1415 (ip0->protocol << 16));
1417 if (BITS (uword) == 32)
1420 ip_csum_with_carry (sum0,
1421 clib_mem_unaligned (&ip0->src_address, u32));
1423 ip_csum_with_carry (sum0,
1424 clib_mem_unaligned (&ip0->dst_address, u32));
1428 ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->src_address, u64));
1430 n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1431 data_this_buffer = (void *) ip0 + ip_header_length;
1432 if (n_this_buffer + ip_header_length > p0->current_length)
1434 p0->current_length >
1435 ip_header_length ? p0->current_length - ip_header_length : 0;
1438 sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1439 n_bytes_left -= n_this_buffer;
1440 if (n_bytes_left == 0)
1443 ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT);
1444 p0 = vlib_get_buffer (vm, p0->next_buffer);
1445 data_this_buffer = vlib_buffer_get_current (p0);
1446 n_this_buffer = p0->current_length;
1449 sum16 = ~ip_csum_fold (sum0);
1455 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1457 ip4_header_t *ip0 = vlib_buffer_get_current (p0);
1461 ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1462 || ip0->protocol == IP_PROTOCOL_UDP);
1464 udp0 = (void *) (ip0 + 1);
1465 if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1467 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1468 | IP_BUFFER_L4_CHECKSUM_CORRECT);
1472 sum16 = ip4_tcp_udp_compute_checksum (vm, p0, ip0);
1474 p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1475 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1481 VNET_FEATURE_ARC_INIT (ip4_local) =
1483 .arc_name = "ip4-local",
1484 .start_nodes = VNET_FEATURES ("ip4-local"),
1489 ip4_local_inline (vlib_main_t * vm,
1490 vlib_node_runtime_t * node,
1491 vlib_frame_t * frame, int head_of_feature_arc)
1493 ip4_main_t *im = &ip4_main;
1494 ip_lookup_main_t *lm = &im->lookup_main;
1495 ip_local_next_t next_index;
1496 u32 *from, *to_next, n_left_from, n_left_to_next;
1497 vlib_node_runtime_t *error_node =
1498 vlib_node_get_runtime (vm, ip4_input_node.index);
1499 u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
1501 from = vlib_frame_vector_args (frame);
1502 n_left_from = frame->n_vectors;
1503 next_index = node->cached_next_index;
1505 if (node->flags & VLIB_NODE_FLAG_TRACE)
1506 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
1508 while (n_left_from > 0)
1510 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1512 while (n_left_from >= 4 && n_left_to_next >= 2)
1514 vlib_buffer_t *p0, *p1;
1515 ip4_header_t *ip0, *ip1;
1516 udp_header_t *udp0, *udp1;
1517 ip4_fib_mtrie_t *mtrie0, *mtrie1;
1518 ip4_fib_mtrie_leaf_t leaf0, leaf1;
1519 const dpo_id_t *dpo0, *dpo1;
1520 const load_balance_t *lb0, *lb1;
1521 u32 pi0, ip_len0, udp_len0, flags0, next0, fib_index0, lbi0;
1522 u32 pi1, ip_len1, udp_len1, flags1, next1, fib_index1, lbi1;
1523 i32 len_diff0, len_diff1;
1524 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1525 u8 error1, is_udp1, is_tcp_udp1, good_tcp_udp1, proto1;
1526 u32 sw_if_index0, sw_if_index1;
1528 pi0 = to_next[0] = from[0];
1529 pi1 = to_next[1] = from[1];
1533 n_left_to_next -= 2;
1535 next0 = next1 = IP_LOCAL_NEXT_DROP;
1537 p0 = vlib_get_buffer (vm, pi0);
1538 p1 = vlib_get_buffer (vm, pi1);
1540 ip0 = vlib_buffer_get_current (p0);
1541 ip1 = vlib_buffer_get_current (p1);
1543 vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
1544 vnet_buffer (p1)->ip.start_of_ip_header = p1->current_data;
1546 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1547 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
1549 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1550 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1552 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1554 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1555 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1557 fib_index1 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index1);
1559 (vnet_buffer (p1)->sw_if_index[VLIB_TX] ==
1560 (u32) ~ 0) ? fib_index1 : vnet_buffer (p1)->sw_if_index[VLIB_TX];
1562 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1563 mtrie1 = &ip4_fib_get (fib_index1)->mtrie;
1565 leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
1568 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1570 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 0);
1572 /* Treat IP frag packets as "experimental" protocol for now
1573 until support of IP frag reassembly is implemented */
1574 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1575 proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
1577 if (head_of_feature_arc == 0)
1579 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1583 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1584 is_udp1 = proto1 == IP_PROTOCOL_UDP;
1585 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1586 is_tcp_udp1 = is_udp1 || proto1 == IP_PROTOCOL_TCP;
1591 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1592 good_tcp_udp1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1594 udp0 = ip4_next_header (ip0);
1595 udp1 = ip4_next_header (ip1);
1597 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1598 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1599 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1602 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1604 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 1);
1606 /* Verify UDP length. */
1607 ip_len0 = clib_net_to_host_u16 (ip0->length);
1608 ip_len1 = clib_net_to_host_u16 (ip1->length);
1609 udp_len0 = clib_net_to_host_u16 (udp0->length);
1610 udp_len1 = clib_net_to_host_u16 (udp1->length);
1612 len_diff0 = ip_len0 - udp_len0;
1613 len_diff1 = ip_len1 - udp_len1;
1615 len_diff0 = is_udp0 ? len_diff0 : 0;
1616 len_diff1 = is_udp1 ? len_diff1 : 0;
1618 if (PREDICT_FALSE (!(is_tcp_udp0 & is_tcp_udp1
1619 & good_tcp_udp0 & good_tcp_udp1)))
1624 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1625 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1627 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1628 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1633 && !(flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1634 flags1 = ip4_tcp_udp_validate_checksum (vm, p1);
1636 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1637 good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
1641 good_tcp_udp0 &= len_diff0 >= 0;
1642 good_tcp_udp1 &= len_diff1 >= 0;
1645 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1647 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 2);
1649 error0 = error1 = IP4_ERROR_UNKNOWN_PROTOCOL;
1651 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1652 error1 = len_diff1 < 0 ? IP4_ERROR_UDP_LENGTH : error1;
1654 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1655 error0 = (is_tcp_udp0 && !good_tcp_udp0
1656 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1657 error1 = (is_tcp_udp1 && !good_tcp_udp1
1658 ? IP4_ERROR_TCP_CHECKSUM + is_udp1 : error1);
1661 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1663 ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 3);
1666 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
1669 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie1->default_leaf : leaf1);
1671 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0 =
1672 ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1673 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1675 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = lbi1 =
1676 ip4_fib_mtrie_leaf_get_adj_index (leaf1);
1677 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = lbi1;
1679 lb0 = load_balance_get (lbi0);
1680 lb1 = load_balance_get (lbi1);
1681 dpo0 = load_balance_get_bucket_i (lb0, 0);
1682 dpo1 = load_balance_get_bucket_i (lb1, 0);
1685 * Must have a route to source otherwise we drop the packet.
1686 * ip4 broadcasts are accepted, e.g. to make dhcp client work
1689 * - the source is a recieve => it's from us => bogus, do this
1690 * first since it sets a different error code.
1691 * - uRPF check for any route to source - accept if passes.
1692 * - allow packets destined to the broadcast address from unknown sources
1694 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1695 dpo0->dpoi_type == DPO_RECEIVE) ?
1696 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1697 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1698 !fib_urpf_check_size (lb0->lb_urpf) &&
1699 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1700 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1701 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1702 dpo1->dpoi_type == DPO_RECEIVE) ?
1703 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error1);
1704 error1 = ((error1 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1705 !fib_urpf_check_size (lb1->lb_urpf) &&
1706 ip1->dst_address.as_u32 != 0xFFFFFFFF)
1707 ? IP4_ERROR_SRC_LOOKUP_MISS : error1);
1709 next0 = lm->local_next_by_ip_protocol[proto0];
1710 next1 = lm->local_next_by_ip_protocol[proto1];
1714 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1716 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1718 p0->error = error0 ? error_node->errors[error0] : 0;
1719 p1->error = error1 ? error_node->errors[error1] : 0;
1721 if (head_of_feature_arc)
1723 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1724 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1725 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1726 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1729 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1730 n_left_to_next, pi0, pi1,
1734 while (n_left_from > 0 && n_left_to_next > 0)
1739 ip4_fib_mtrie_t *mtrie0;
1740 ip4_fib_mtrie_leaf_t leaf0;
1741 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
1743 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1744 load_balance_t *lb0;
1745 const dpo_id_t *dpo0;
1748 pi0 = to_next[0] = from[0];
1752 n_left_to_next -= 1;
1754 next0 = IP_LOCAL_NEXT_DROP;
1756 p0 = vlib_get_buffer (vm, pi0);
1758 ip0 = vlib_buffer_get_current (p0);
1760 vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
1762 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1764 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1767 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1768 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1770 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1772 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
1775 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1777 /* Treat IP frag packets as "experimental" protocol for now
1778 until support of IP frag reassembly is implemented */
1779 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1781 if (head_of_feature_arc == 0)
1783 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1787 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1788 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1792 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1794 udp0 = ip4_next_header (ip0);
1796 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1797 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1800 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1802 /* Verify UDP length. */
1803 ip_len0 = clib_net_to_host_u16 (ip0->length);
1804 udp_len0 = clib_net_to_host_u16 (udp0->length);
1806 len_diff0 = ip_len0 - udp_len0;
1808 len_diff0 = is_udp0 ? len_diff0 : 0;
1810 if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
1815 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1816 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1818 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1819 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1823 good_tcp_udp0 &= len_diff0 >= 0;
1826 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1828 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1830 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1832 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1833 error0 = (is_tcp_udp0 && !good_tcp_udp0
1834 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1837 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1840 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
1842 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1843 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1845 lb0 = load_balance_get (lbi0);
1846 dpo0 = load_balance_get_bucket_i (lb0, 0);
1848 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1849 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1851 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1852 dpo0->dpoi_type == DPO_RECEIVE) ?
1853 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1854 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1855 !fib_urpf_check_size (lb0->lb_urpf) &&
1856 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1857 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1861 next0 = lm->local_next_by_ip_protocol[proto0];
1864 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1866 p0->error = error0 ? error_node->errors[error0] : 0;
1868 if (head_of_feature_arc)
1870 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1871 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1874 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1875 n_left_to_next, pi0, next0);
1879 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1882 return frame->n_vectors;
1886 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1888 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1892 VLIB_REGISTER_NODE (ip4_local_node) =
1894 .function = ip4_local,
1895 .name = "ip4-local",
1896 .vector_size = sizeof (u32),
1897 .format_trace = format_ip4_forward_next_trace,
1898 .n_next_nodes = IP_LOCAL_N_NEXT,
1901 [IP_LOCAL_NEXT_DROP] = "error-drop",
1902 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1903 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1904 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
1908 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1911 ip4_local_end_of_arc (vlib_main_t * vm,
1912 vlib_node_runtime_t * node, vlib_frame_t * frame)
1914 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1918 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1919 .function = ip4_local_end_of_arc,
1920 .name = "ip4-local-end-of-arc",
1921 .vector_size = sizeof (u32),
1923 .format_trace = format_ip4_forward_next_trace,
1924 .sibling_of = "ip4-local",
1927 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1929 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1930 .arc_name = "ip4-local",
1931 .node_name = "ip4-local-end-of-arc",
1932 .runs_before = 0, /* not before any other features */
1937 ip4_register_protocol (u32 protocol, u32 node_index)
1939 vlib_main_t *vm = vlib_get_main ();
1940 ip4_main_t *im = &ip4_main;
1941 ip_lookup_main_t *lm = &im->lookup_main;
1943 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1944 lm->local_next_by_ip_protocol[protocol] =
1945 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1948 static clib_error_t *
1949 show_ip_local_command_fn (vlib_main_t * vm,
1950 unformat_input_t * input, vlib_cli_command_t * cmd)
1952 ip4_main_t *im = &ip4_main;
1953 ip_lookup_main_t *lm = &im->lookup_main;
1956 vlib_cli_output (vm, "Protocols handled by ip4_local");
1957 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1959 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1960 vlib_cli_output (vm, "%d", i);
1968 * Display the set of protocols handled by the local IPv4 stack.
1971 * Example of how to display local protocol table:
1972 * @cliexstart{show ip local}
1973 * Protocols handled by ip4_local
1980 VLIB_CLI_COMMAND (show_ip_local, static) =
1982 .path = "show ip local",
1983 .function = show_ip_local_command_fn,
1984 .short_help = "show ip local",
1989 ip4_arp_inline (vlib_main_t * vm,
1990 vlib_node_runtime_t * node,
1991 vlib_frame_t * frame, int is_glean)
1993 vnet_main_t *vnm = vnet_get_main ();
1994 ip4_main_t *im = &ip4_main;
1995 ip_lookup_main_t *lm = &im->lookup_main;
1996 u32 *from, *to_next_drop;
1997 uword n_left_from, n_left_to_next_drop, next_index;
1998 static f64 time_last_seed_change = -1e100;
1999 static u32 hash_seeds[3];
2000 static uword hash_bitmap[256 / BITS (uword)];
2003 if (node->flags & VLIB_NODE_FLAG_TRACE)
2004 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2006 time_now = vlib_time_now (vm);
2007 if (time_now - time_last_seed_change > 1e-3)
2010 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
2011 sizeof (hash_seeds));
2012 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2013 hash_seeds[i] = r[i];
2015 /* Mark all hash keys as been no-seen before. */
2016 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2019 time_last_seed_change = time_now;
2022 from = vlib_frame_vector_args (frame);
2023 n_left_from = frame->n_vectors;
2024 next_index = node->cached_next_index;
2025 if (next_index == IP4_ARP_NEXT_DROP)
2026 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2028 while (n_left_from > 0)
2030 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2031 to_next_drop, n_left_to_next_drop);
2033 while (n_left_from > 0 && n_left_to_next_drop > 0)
2035 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2036 ip_adjacency_t *adj0;
2043 p0 = vlib_get_buffer (vm, pi0);
2045 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2046 adj0 = ip_get_adjacency (lm, adj_index0);
2047 ip0 = vlib_buffer_get_current (p0);
2053 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2054 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2059 * this is the Glean case, so we are ARPing for the
2060 * packet's destination
2062 a0 ^= ip0->dst_address.data_u32;
2066 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2070 hash_v3_finalize32 (a0, b0, c0);
2072 c0 &= BITS (hash_bitmap) - 1;
2073 c0 = c0 / BITS (uword);
2074 m0 = (uword) 1 << (c0 % BITS (uword));
2076 bm0 = hash_bitmap[c0];
2077 drop0 = (bm0 & m0) != 0;
2079 /* Mark it as seen. */
2080 hash_bitmap[c0] = bm0 | m0;
2084 to_next_drop[0] = pi0;
2086 n_left_to_next_drop -= 1;
2089 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2090 IP4_ARP_ERROR_REQUEST_SENT];
2093 * the adj has been updated to a rewrite but the node the DPO that got
2094 * us here hasn't - yet. no big deal. we'll drop while we wait.
2096 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2103 * Can happen if the control-plane is programming tables
2104 * with traffic flowing; at least that's today's lame excuse.
2106 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2107 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2109 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2112 /* Send ARP request. */
2116 ethernet_arp_header_t *h0;
2117 vnet_hw_interface_t *hw_if0;
2120 vlib_packet_template_get_packet (vm,
2121 &im->ip4_arp_request_packet_template,
2124 /* Add rewrite/encap string for ARP packet. */
2125 vnet_rewrite_one_header (adj0[0], h0,
2126 sizeof (ethernet_header_t));
2128 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2130 /* Src ethernet address in ARP header. */
2131 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2133 sizeof (h0->ip4_over_ethernet[0].ethernet));
2137 /* The interface's source address is stashed in the Glean Adj */
2138 h0->ip4_over_ethernet[0].ip4 =
2139 adj0->sub_type.glean.receive_addr.ip4;
2141 /* Copy in destination address we are requesting. This is the
2142 * glean case, so it's the packet's destination.*/
2143 h0->ip4_over_ethernet[1].ip4.data_u32 =
2144 ip0->dst_address.data_u32;
2148 /* Src IP address in ARP header. */
2149 if (ip4_src_address_for_packet (lm, sw_if_index0,
2151 ip4_over_ethernet[0].ip4))
2153 /* No source address available */
2155 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2156 vlib_buffer_free (vm, &bi0, 1);
2160 /* Copy in destination address we are requesting from the
2162 h0->ip4_over_ethernet[1].ip4.data_u32 =
2163 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2166 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2167 b0 = vlib_get_buffer (vm, bi0);
2168 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2170 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2172 vlib_set_next_frame_buffer (vm, node,
2173 adj0->rewrite_header.next_index,
2178 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2181 return frame->n_vectors;
2185 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2187 return (ip4_arp_inline (vm, node, frame, 0));
2191 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2193 return (ip4_arp_inline (vm, node, frame, 1));
2196 static char *ip4_arp_error_strings[] = {
2197 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2198 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2199 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2200 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2201 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2202 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2205 VLIB_REGISTER_NODE (ip4_arp_node) =
2207 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2208 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2209 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2210 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2212 [IP4_ARP_NEXT_DROP] = "error-drop",}
2215 VLIB_REGISTER_NODE (ip4_glean_node) =
2217 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2218 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2219 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2220 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2222 [IP4_ARP_NEXT_DROP] = "error-drop",}
2225 #define foreach_notrace_ip4_arp_error \
2232 arp_notrace_init (vlib_main_t * vm)
2234 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2236 /* don't trace ARP request packets */
2238 vnet_pcap_drop_trace_filter_add_del \
2239 (rt->errors[IP4_ARP_ERROR_##a], \
2241 foreach_notrace_ip4_arp_error;
2246 VLIB_INIT_FUNCTION (arp_notrace_init);
2249 /* Send an ARP request to see if given destination is reachable on given interface. */
2251 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2253 vnet_main_t *vnm = vnet_get_main ();
2254 ip4_main_t *im = &ip4_main;
2255 ethernet_arp_header_t *h;
2257 ip_interface_address_t *ia;
2258 ip_adjacency_t *adj;
2259 vnet_hw_interface_t *hi;
2260 vnet_sw_interface_t *si;
2264 si = vnet_get_sw_interface (vnm, sw_if_index);
2266 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2268 return clib_error_return (0, "%U: interface %U down",
2269 format_ip4_address, dst,
2270 format_vnet_sw_if_index_name, vnm,
2275 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2278 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2279 return clib_error_return
2281 "no matching interface address for destination %U (interface %U)",
2282 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2286 adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2289 vlib_packet_template_get_packet (vm,
2290 &im->ip4_arp_request_packet_template,
2293 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2295 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2296 sizeof (h->ip4_over_ethernet[0].ethernet));
2298 h->ip4_over_ethernet[0].ip4 = src[0];
2299 h->ip4_over_ethernet[1].ip4 = dst[0];
2301 b = vlib_get_buffer (vm, bi);
2302 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2303 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2305 /* Add encapsulation string for software interface (e.g. ethernet header). */
2306 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2307 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2310 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2311 u32 *to_next = vlib_frame_vector_args (f);
2314 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2317 return /* no error */ 0;
2322 IP4_REWRITE_NEXT_DROP,
2323 IP4_REWRITE_NEXT_ICMP_ERROR,
2324 } ip4_rewrite_next_t;
2327 ip4_rewrite_inline (vlib_main_t * vm,
2328 vlib_node_runtime_t * node,
2329 vlib_frame_t * frame,
2330 int do_counters, int is_midchain, int is_mcast)
2332 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2333 u32 *from = vlib_frame_vector_args (frame);
2334 u32 n_left_from, n_left_to_next, *to_next, next_index;
2335 vlib_node_runtime_t *error_node =
2336 vlib_node_get_runtime (vm, ip4_input_node.index);
2338 n_left_from = frame->n_vectors;
2339 next_index = node->cached_next_index;
2340 u32 cpu_index = os_get_cpu_number ();
2342 while (n_left_from > 0)
2344 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2346 while (n_left_from >= 4 && n_left_to_next >= 2)
2348 ip_adjacency_t *adj0, *adj1;
2349 vlib_buffer_t *p0, *p1;
2350 ip4_header_t *ip0, *ip1;
2351 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2352 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2353 u32 tx_sw_if_index0, tx_sw_if_index1;
2355 /* Prefetch next iteration. */
2357 vlib_buffer_t *p2, *p3;
2359 p2 = vlib_get_buffer (vm, from[2]);
2360 p3 = vlib_get_buffer (vm, from[3]);
2362 vlib_prefetch_buffer_header (p2, STORE);
2363 vlib_prefetch_buffer_header (p3, STORE);
2365 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2366 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2369 pi0 = to_next[0] = from[0];
2370 pi1 = to_next[1] = from[1];
2375 n_left_to_next -= 2;
2377 p0 = vlib_get_buffer (vm, pi0);
2378 p1 = vlib_get_buffer (vm, pi1);
2380 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2381 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2383 /* We should never rewrite a pkt using the MISS adjacency */
2384 ASSERT (adj_index0 && adj_index1);
2386 ip0 = vlib_buffer_get_current (p0);
2387 ip1 = vlib_buffer_get_current (p1);
2389 error0 = error1 = IP4_ERROR_NONE;
2390 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2392 /* Decrement TTL & update checksum.
2393 Works either endian, so no need for byte swap. */
2394 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2396 i32 ttl0 = ip0->ttl;
2398 /* Input node should have reject packets with ttl 0. */
2399 ASSERT (ip0->ttl > 0);
2401 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2402 checksum0 += checksum0 >= 0xffff;
2404 ip0->checksum = checksum0;
2409 * If the ttl drops below 1 when forwarding, generate
2412 if (PREDICT_FALSE (ttl0 <= 0))
2414 error0 = IP4_ERROR_TIME_EXPIRED;
2415 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2416 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2417 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2419 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2422 /* Verify checksum. */
2423 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2427 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2429 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2431 i32 ttl1 = ip1->ttl;
2433 /* Input node should have reject packets with ttl 0. */
2434 ASSERT (ip1->ttl > 0);
2436 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2437 checksum1 += checksum1 >= 0xffff;
2439 ip1->checksum = checksum1;
2444 * If the ttl drops below 1 when forwarding, generate
2447 if (PREDICT_FALSE (ttl1 <= 0))
2449 error1 = IP4_ERROR_TIME_EXPIRED;
2450 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2451 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2452 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2454 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2457 /* Verify checksum. */
2458 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2459 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2463 p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2466 /* Rewrite packet header and updates lengths. */
2467 adj0 = ip_get_adjacency (lm, adj_index0);
2468 adj1 = ip_get_adjacency (lm, adj_index1);
2470 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2471 rw_len0 = adj0[0].rewrite_header.data_bytes;
2472 rw_len1 = adj1[0].rewrite_header.data_bytes;
2473 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2474 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2476 /* Check MTU of outgoing interface. */
2478 (vlib_buffer_length_in_chain (vm, p0) >
2480 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2483 (vlib_buffer_length_in_chain (vm, p1) >
2485 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2489 * pre-fetch the per-adjacency counters
2493 vlib_prefetch_combined_counter (&adjacency_counters,
2494 cpu_index, adj_index0);
2495 vlib_prefetch_combined_counter (&adjacency_counters,
2496 cpu_index, adj_index1);
2499 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2500 * to see the IP headerr */
2501 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2503 next0 = adj0[0].rewrite_header.next_index;
2504 p0->current_data -= rw_len0;
2505 p0->current_length += rw_len0;
2506 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2507 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2509 vnet_feature_arc_start (lm->output_feature_arc_index,
2510 tx_sw_if_index0, &next0, p0);
2512 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2514 next1 = adj1[0].rewrite_header.next_index;
2515 p1->current_data -= rw_len1;
2516 p1->current_length += rw_len1;
2518 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2519 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2521 vnet_feature_arc_start (lm->output_feature_arc_index,
2522 tx_sw_if_index1, &next1, p1);
2525 /* Guess we are only writing on simple Ethernet header. */
2526 vnet_rewrite_two_headers (adj0[0], adj1[0],
2527 ip0, ip1, sizeof (ethernet_header_t));
2530 * Bump the per-adjacency counters
2534 vlib_increment_combined_counter
2535 (&adjacency_counters,
2538 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2540 vlib_increment_combined_counter
2541 (&adjacency_counters,
2544 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2549 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2550 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2555 * copy bytes from the IP address into the MAC rewrite
2557 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
2558 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1, 1);
2561 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2562 to_next, n_left_to_next,
2563 pi0, pi1, next0, next1);
2566 while (n_left_from > 0 && n_left_to_next > 0)
2568 ip_adjacency_t *adj0;
2571 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2572 u32 tx_sw_if_index0;
2574 pi0 = to_next[0] = from[0];
2576 p0 = vlib_get_buffer (vm, pi0);
2578 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2580 /* We should never rewrite a pkt using the MISS adjacency */
2581 ASSERT (adj_index0);
2583 adj0 = ip_get_adjacency (lm, adj_index0);
2585 ip0 = vlib_buffer_get_current (p0);
2587 error0 = IP4_ERROR_NONE;
2588 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2590 /* Decrement TTL & update checksum. */
2591 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2593 i32 ttl0 = ip0->ttl;
2595 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2597 checksum0 += checksum0 >= 0xffff;
2599 ip0->checksum = checksum0;
2601 ASSERT (ip0->ttl > 0);
2607 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2609 if (PREDICT_FALSE (ttl0 <= 0))
2612 * If the ttl drops below 1 when forwarding, generate
2615 error0 = IP4_ERROR_TIME_EXPIRED;
2616 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2617 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2618 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2619 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2625 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2628 vlib_prefetch_combined_counter (&adjacency_counters,
2629 cpu_index, adj_index0);
2631 /* Guess we are only writing on simple Ethernet header. */
2632 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2636 * copy bytes from the IP address into the MAC rewrite
2638 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
2641 /* Update packet buffer attributes/set output interface. */
2642 rw_len0 = adj0[0].rewrite_header.data_bytes;
2643 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2645 vlib_increment_combined_counter
2646 (&adjacency_counters,
2648 adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2650 /* Check MTU of outgoing interface. */
2651 error0 = (vlib_buffer_length_in_chain (vm, p0)
2652 > adj0[0].rewrite_header.max_l3_packet_bytes
2653 ? IP4_ERROR_MTU_EXCEEDED : error0);
2655 p0->error = error_node->errors[error0];
2657 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2658 * to see the IP headerr */
2659 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2661 p0->current_data -= rw_len0;
2662 p0->current_length += rw_len0;
2663 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2665 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2666 next0 = adj0[0].rewrite_header.next_index;
2670 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2673 vnet_feature_arc_start (lm->output_feature_arc_index,
2674 tx_sw_if_index0, &next0, p0);
2681 n_left_to_next -= 1;
2683 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2684 to_next, n_left_to_next,
2688 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2691 /* Need to do trace after rewrites to pick up new packet data. */
2692 if (node->flags & VLIB_NODE_FLAG_TRACE)
2693 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2695 return frame->n_vectors;
2699 /** @brief IPv4 rewrite node.
2702 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2703 header checksum, fetch the ip adjacency, check the outbound mtu,
2704 apply the adjacency rewrite, and send pkts to the adjacency
2705 rewrite header's rewrite_next_index.
2707 @param vm vlib_main_t corresponding to the current thread
2708 @param node vlib_node_runtime_t
2709 @param frame vlib_frame_t whose contents should be dispatched
2711 @par Graph mechanics: buffer metadata, next index usage
2714 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2715 - the rewrite adjacency index
2716 - <code>adj->lookup_next_index</code>
2717 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2718 the packet will be dropped.
2719 - <code>adj->rewrite_header</code>
2720 - Rewrite string length, rewrite string, next_index
2723 - <code>b->current_data, b->current_length</code>
2724 - Updated net of applying the rewrite string
2726 <em>Next Indices:</em>
2727 - <code> adj->rewrite_header.next_index </code>
2731 ip4_rewrite (vlib_main_t * vm,
2732 vlib_node_runtime_t * node, vlib_frame_t * frame)
2734 if (adj_are_counters_enabled ())
2735 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2737 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2741 ip4_midchain (vlib_main_t * vm,
2742 vlib_node_runtime_t * node, vlib_frame_t * frame)
2744 if (adj_are_counters_enabled ())
2745 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2747 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2751 ip4_rewrite_mcast (vlib_main_t * vm,
2752 vlib_node_runtime_t * node, vlib_frame_t * frame)
2754 if (adj_are_counters_enabled ())
2755 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2757 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2761 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2762 .function = ip4_rewrite,
2763 .name = "ip4-rewrite",
2764 .vector_size = sizeof (u32),
2766 .format_trace = format_ip4_rewrite_trace,
2770 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2771 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2774 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2776 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2777 .function = ip4_rewrite_mcast,
2778 .name = "ip4-rewrite-mcast",
2779 .vector_size = sizeof (u32),
2781 .format_trace = format_ip4_rewrite_trace,
2782 .sibling_of = "ip4-rewrite",
2784 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2786 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2787 .function = ip4_midchain,
2788 .name = "ip4-midchain",
2789 .vector_size = sizeof (u32),
2790 .format_trace = format_ip4_forward_next_trace,
2791 .sibling_of = "ip4-rewrite",
2793 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2796 static clib_error_t *
2797 add_del_interface_table (vlib_main_t * vm,
2798 unformat_input_t * input, vlib_cli_command_t * cmd)
2800 vnet_main_t *vnm = vnet_get_main ();
2801 ip_interface_address_t *ia;
2802 clib_error_t *error = 0;
2803 u32 sw_if_index, table_id;
2807 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2809 error = clib_error_return (0, "unknown interface `%U'",
2810 format_unformat_error, input);
2814 if (unformat (input, "%d", &table_id))
2818 error = clib_error_return (0, "expected table id `%U'",
2819 format_unformat_error, input);
2824 * If the interface already has in IP address, then a change int
2825 * VRF is not allowed. The IP address applied must first be removed.
2826 * We do not do that automatically here, since VPP has no knowledge
2827 * of whether thoses subnets are valid in the destination VRF.
2830 foreach_ip_interface_address (&ip4_main.lookup_main,
2832 1 /* honor unnumbered */,
2836 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2837 error = clib_error_return (0, "interface %U has address %U",
2838 format_vnet_sw_if_index_name, vnm,
2840 format_ip4_address, a);
2846 ip4_main_t *im = &ip4_main;
2849 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2851 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2852 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2854 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2855 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2856 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2864 * Place the indicated interface into the supplied IPv4 FIB table (also known
2865 * as a VRF). If the FIB table does not exist, this command creates it. To
2866 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2867 * FIB table will only be displayed if a route has been added to the table, or
2868 * an IP Address is assigned to an interface in the table (which adds a route
2871 * @note IP addresses added after setting the interface IP table are added to
2872 * the indicated FIB table. If an IP address is added prior to changing the
2873 * table then this is an error. The control plane must remove these addresses
2874 * first and then change the table. VPP will not automatically move the
2875 * addresses from the old to the new table as it does not know the validity
2879 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2880 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2883 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2885 .path = "set interface ip table",
2886 .function = add_del_interface_table,
2887 .short_help = "set interface ip table <interface> <table-id>",
2892 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2894 ip4_fib_mtrie_t *mtrie0;
2895 ip4_fib_mtrie_leaf_t leaf0;
2898 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2900 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
2901 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 0);
2902 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 1);
2903 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2904 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2906 /* Handle default route. */
2907 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
2909 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2911 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2914 static clib_error_t *
2915 test_lookup_command_fn (vlib_main_t * vm,
2916 unformat_input_t * input, vlib_cli_command_t * cmd)
2923 ip4_address_t ip4_base_address;
2926 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2928 if (unformat (input, "table %d", &table_id))
2930 /* Make sure the entry exists. */
2931 fib = ip4_fib_get (table_id);
2932 if ((fib) && (fib->index != table_id))
2933 return clib_error_return (0, "<fib-index> %d does not exist",
2936 else if (unformat (input, "count %f", &count))
2939 else if (unformat (input, "%U",
2940 unformat_ip4_address, &ip4_base_address))
2943 return clib_error_return (0, "unknown input `%U'",
2944 format_unformat_error, input);
2949 for (i = 0; i < n; i++)
2951 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2954 ip4_base_address.as_u32 =
2955 clib_host_to_net_u32 (1 +
2956 clib_net_to_host_u32 (ip4_base_address.as_u32));
2960 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2962 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2968 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2969 * given FIB table to determine if there is a conflict with the
2970 * adjacency table. The fib-id can be determined by using the
2971 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2974 * @todo This command uses fib-id, other commands use table-id (not
2975 * just a name, they are different indexes). Would like to change this
2976 * to table-id for consistency.
2979 * Example of how to run the test lookup command:
2980 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2981 * No errors in 2 lookups
2985 VLIB_CLI_COMMAND (lookup_test_command, static) =
2987 .path = "test lookup",
2988 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2989 .function = test_lookup_command_fn,
2994 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2996 ip4_main_t *im4 = &ip4_main;
2998 uword *p = hash_get (im4->fib_index_by_table_id, table_id);
3001 return VNET_API_ERROR_NO_SUCH_FIB;
3003 fib = ip4_fib_get (p[0]);
3005 fib->flow_hash_config = flow_hash_config;
3009 static clib_error_t *
3010 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3011 unformat_input_t * input,
3012 vlib_cli_command_t * cmd)
3016 u32 flow_hash_config = 0;
3019 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3021 if (unformat (input, "table %d", &table_id))
3024 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3025 foreach_flow_hash_bit
3032 return clib_error_return (0, "unknown input `%U'",
3033 format_unformat_error, input);
3035 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3041 case VNET_API_ERROR_NO_SUCH_FIB:
3042 return clib_error_return (0, "no such FIB table %d", table_id);
3045 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3053 * Configure the set of IPv4 fields used by the flow hash.
3056 * Example of how to set the flow hash on a given table:
3057 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3058 * Example of display the configured flow hash:
3059 * @cliexstart{show ip fib}
3060 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3063 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3064 * [0] [@0]: dpo-drop ip6
3067 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3068 * [0] [@0]: dpo-drop ip6
3071 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3072 * [0] [@0]: dpo-drop ip6
3075 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3076 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3079 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3080 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3081 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3082 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3083 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3086 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3087 * [0] [@0]: dpo-drop ip6
3088 * 255.255.255.255/32
3090 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3091 * [0] [@0]: dpo-drop ip6
3092 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3095 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3096 * [0] [@0]: dpo-drop ip6
3099 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3100 * [0] [@0]: dpo-drop ip6
3103 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3104 * [0] [@4]: ipv4-glean: af_packet0
3107 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3108 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3111 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3112 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3115 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3116 * [0] [@4]: ipv4-glean: af_packet1
3119 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3120 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3123 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3124 * [0] [@0]: dpo-drop ip6
3127 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3128 * [0] [@0]: dpo-drop ip6
3129 * 255.255.255.255/32
3131 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3132 * [0] [@0]: dpo-drop ip6
3136 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3138 .path = "set ip flow-hash",
3140 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3141 .function = set_ip_flow_hash_command_fn,
3146 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3149 vnet_main_t *vnm = vnet_get_main ();
3150 vnet_interface_main_t *im = &vnm->interface_main;
3151 ip4_main_t *ipm = &ip4_main;
3152 ip_lookup_main_t *lm = &ipm->lookup_main;
3153 vnet_classify_main_t *cm = &vnet_classify_main;
3154 ip4_address_t *if_addr;
3156 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3157 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3159 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3160 return VNET_API_ERROR_NO_SUCH_ENTRY;
3162 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3163 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3165 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3167 if (NULL != if_addr)
3169 fib_prefix_t pfx = {
3171 .fp_proto = FIB_PROTOCOL_IP4,
3172 .fp_addr.ip4 = *if_addr,
3176 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3180 if (table_index != (u32) ~ 0)
3182 dpo_id_t dpo = DPO_INVALID;
3187 classify_dpo_create (DPO_PROTO_IP4, table_index));
3189 fib_table_entry_special_dpo_add (fib_index,
3191 FIB_SOURCE_CLASSIFY,
3192 FIB_ENTRY_FLAG_NONE, &dpo);
3197 fib_table_entry_special_remove (fib_index,
3198 &pfx, FIB_SOURCE_CLASSIFY);
3205 static clib_error_t *
3206 set_ip_classify_command_fn (vlib_main_t * vm,
3207 unformat_input_t * input,
3208 vlib_cli_command_t * cmd)
3210 u32 table_index = ~0;
3211 int table_index_set = 0;
3212 u32 sw_if_index = ~0;
3215 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3217 if (unformat (input, "table-index %d", &table_index))
3218 table_index_set = 1;
3219 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3220 vnet_get_main (), &sw_if_index))
3226 if (table_index_set == 0)
3227 return clib_error_return (0, "classify table-index must be specified");
3229 if (sw_if_index == ~0)
3230 return clib_error_return (0, "interface / subif must be specified");
3232 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3239 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3240 return clib_error_return (0, "No such interface");
3242 case VNET_API_ERROR_NO_SUCH_ENTRY:
3243 return clib_error_return (0, "No such classifier table");
3249 * Assign a classification table to an interface. The classification
3250 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3251 * commands. Once the table is create, use this command to filter packets
3255 * Example of how to assign a classification table to an interface:
3256 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3259 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3261 .path = "set ip classify",
3263 "set ip classify intfc <interface> table-index <classify-idx>",
3264 .function = set_ip_classify_command_fn,
3269 * fd.io coding-style-patch-verification: ON
3272 * eval: (c-set-style "gnu")