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);
1711 next0 = lm->local_next_by_ip_protocol[proto0];
1712 next1 = lm->local_next_by_ip_protocol[proto1];
1715 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1717 error1 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1719 p0->error = error0 ? error_node->errors[error0] : 0;
1720 p1->error = error1 ? error_node->errors[error1] : 0;
1722 if (head_of_feature_arc)
1724 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1725 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1726 if (PREDICT_TRUE (error1 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1727 vnet_feature_arc_start (arc_index, sw_if_index1, &next1, p1);
1730 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
1731 n_left_to_next, pi0, pi1,
1735 while (n_left_from > 0 && n_left_to_next > 0)
1740 ip4_fib_mtrie_t *mtrie0;
1741 ip4_fib_mtrie_leaf_t leaf0;
1742 u32 pi0, next0, ip_len0, udp_len0, flags0, fib_index0, lbi0;
1744 u8 error0, is_udp0, is_tcp_udp0, good_tcp_udp0, proto0;
1745 load_balance_t *lb0;
1746 const dpo_id_t *dpo0;
1749 pi0 = to_next[0] = from[0];
1753 n_left_to_next -= 1;
1755 next0 = IP_LOCAL_NEXT_DROP;
1757 p0 = vlib_get_buffer (vm, pi0);
1759 ip0 = vlib_buffer_get_current (p0);
1761 vnet_buffer (p0)->ip.start_of_ip_header = p0->current_data;
1763 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
1765 fib_index0 = vec_elt (im->fib_index_by_sw_if_index, sw_if_index0);
1768 (vnet_buffer (p0)->sw_if_index[VLIB_TX] ==
1769 (u32) ~ 0) ? fib_index0 : vnet_buffer (p0)->sw_if_index[VLIB_TX];
1771 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
1773 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
1776 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 0);
1778 /* Treat IP frag packets as "experimental" protocol for now
1779 until support of IP frag reassembly is implemented */
1780 proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
1782 if (head_of_feature_arc == 0)
1784 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1788 is_udp0 = proto0 == IP_PROTOCOL_UDP;
1789 is_tcp_udp0 = is_udp0 || proto0 == IP_PROTOCOL_TCP;
1793 good_tcp_udp0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1795 udp0 = ip4_next_header (ip0);
1797 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1798 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1801 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
1803 /* Verify UDP length. */
1804 ip_len0 = clib_net_to_host_u16 (ip0->length);
1805 udp_len0 = clib_net_to_host_u16 (udp0->length);
1807 len_diff0 = ip_len0 - udp_len0;
1809 len_diff0 = is_udp0 ? len_diff0 : 0;
1811 if (PREDICT_FALSE (!(is_tcp_udp0 & good_tcp_udp0)))
1816 && !(flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED))
1817 flags0 = ip4_tcp_udp_validate_checksum (vm, p0);
1819 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1820 good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
1824 good_tcp_udp0 &= len_diff0 >= 0;
1827 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 2);
1829 error0 = IP4_ERROR_UNKNOWN_PROTOCOL;
1831 error0 = len_diff0 < 0 ? IP4_ERROR_UDP_LENGTH : error0;
1833 ASSERT (IP4_ERROR_TCP_CHECKSUM + 1 == IP4_ERROR_UDP_CHECKSUM);
1834 error0 = (is_tcp_udp0 && !good_tcp_udp0
1835 ? IP4_ERROR_TCP_CHECKSUM + is_udp0 : error0);
1838 ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 3);
1841 IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
1843 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
1844 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = lbi0;
1846 lb0 = load_balance_get (lbi0);
1847 dpo0 = load_balance_get_bucket_i (lb0, 0);
1849 vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
1850 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = lbi0;
1852 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1853 dpo0->dpoi_type == DPO_RECEIVE) ?
1854 IP4_ERROR_SPOOFED_LOCAL_PACKETS : error0);
1855 error0 = ((error0 == IP4_ERROR_UNKNOWN_PROTOCOL &&
1856 !fib_urpf_check_size (lb0->lb_urpf) &&
1857 ip0->dst_address.as_u32 != 0xFFFFFFFF)
1858 ? IP4_ERROR_SRC_LOOKUP_MISS : error0);
1862 next0 = lm->local_next_by_ip_protocol[proto0];
1865 error0 != IP4_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1867 p0->error = error0 ? error_node->errors[error0] : 0;
1869 if (head_of_feature_arc)
1871 if (PREDICT_TRUE (error0 == (u8) IP4_ERROR_UNKNOWN_PROTOCOL))
1872 vnet_feature_arc_start (arc_index, sw_if_index0, &next0, p0);
1875 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1876 n_left_to_next, pi0, next0);
1880 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1883 return frame->n_vectors;
1887 ip4_local (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
1889 return ip4_local_inline (vm, node, frame, 1 /* head of feature arc */ );
1893 VLIB_REGISTER_NODE (ip4_local_node) =
1895 .function = ip4_local,
1896 .name = "ip4-local",
1897 .vector_size = sizeof (u32),
1898 .format_trace = format_ip4_forward_next_trace,
1899 .n_next_nodes = IP_LOCAL_N_NEXT,
1902 [IP_LOCAL_NEXT_DROP] = "error-drop",
1903 [IP_LOCAL_NEXT_PUNT] = "error-punt",
1904 [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
1905 [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",},
1909 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_node, ip4_local);
1912 ip4_local_end_of_arc (vlib_main_t * vm,
1913 vlib_node_runtime_t * node, vlib_frame_t * frame)
1915 return ip4_local_inline (vm, node, frame, 0 /* head of feature arc */ );
1919 VLIB_REGISTER_NODE (ip4_local_end_of_arc_node,static) = {
1920 .function = ip4_local_end_of_arc,
1921 .name = "ip4-local-end-of-arc",
1922 .vector_size = sizeof (u32),
1924 .format_trace = format_ip4_forward_next_trace,
1925 .sibling_of = "ip4-local",
1928 VLIB_NODE_FUNCTION_MULTIARCH (ip4_local_end_of_arc_node, ip4_local_end_of_arc)
1930 VNET_FEATURE_INIT (ip4_local_end_of_arc, static) = {
1931 .arc_name = "ip4-local",
1932 .node_name = "ip4-local-end-of-arc",
1933 .runs_before = 0, /* not before any other features */
1938 ip4_register_protocol (u32 protocol, u32 node_index)
1940 vlib_main_t *vm = vlib_get_main ();
1941 ip4_main_t *im = &ip4_main;
1942 ip_lookup_main_t *lm = &im->lookup_main;
1944 ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1945 lm->local_next_by_ip_protocol[protocol] =
1946 vlib_node_add_next (vm, ip4_local_node.index, node_index);
1949 static clib_error_t *
1950 show_ip_local_command_fn (vlib_main_t * vm,
1951 unformat_input_t * input, vlib_cli_command_t * cmd)
1953 ip4_main_t *im = &ip4_main;
1954 ip_lookup_main_t *lm = &im->lookup_main;
1957 vlib_cli_output (vm, "Protocols handled by ip4_local");
1958 for (i = 0; i < ARRAY_LEN (lm->local_next_by_ip_protocol); i++)
1960 if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
1961 vlib_cli_output (vm, "%d", i);
1969 * Display the set of protocols handled by the local IPv4 stack.
1972 * Example of how to display local protocol table:
1973 * @cliexstart{show ip local}
1974 * Protocols handled by ip4_local
1981 VLIB_CLI_COMMAND (show_ip_local, static) =
1983 .path = "show ip local",
1984 .function = show_ip_local_command_fn,
1985 .short_help = "show ip local",
1990 ip4_arp_inline (vlib_main_t * vm,
1991 vlib_node_runtime_t * node,
1992 vlib_frame_t * frame, int is_glean)
1994 vnet_main_t *vnm = vnet_get_main ();
1995 ip4_main_t *im = &ip4_main;
1996 ip_lookup_main_t *lm = &im->lookup_main;
1997 u32 *from, *to_next_drop;
1998 uword n_left_from, n_left_to_next_drop, next_index;
1999 static f64 time_last_seed_change = -1e100;
2000 static u32 hash_seeds[3];
2001 static uword hash_bitmap[256 / BITS (uword)];
2004 if (node->flags & VLIB_NODE_FLAG_TRACE)
2005 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2007 time_now = vlib_time_now (vm);
2008 if (time_now - time_last_seed_change > 1e-3)
2011 u32 *r = clib_random_buffer_get_data (&vm->random_buffer,
2012 sizeof (hash_seeds));
2013 for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2014 hash_seeds[i] = r[i];
2016 /* Mark all hash keys as been no-seen before. */
2017 for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2020 time_last_seed_change = time_now;
2023 from = vlib_frame_vector_args (frame);
2024 n_left_from = frame->n_vectors;
2025 next_index = node->cached_next_index;
2026 if (next_index == IP4_ARP_NEXT_DROP)
2027 next_index = IP4_ARP_N_NEXT; /* point to first interface */
2029 while (n_left_from > 0)
2031 vlib_get_next_frame (vm, node, IP4_ARP_NEXT_DROP,
2032 to_next_drop, n_left_to_next_drop);
2034 while (n_left_from > 0 && n_left_to_next_drop > 0)
2036 u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2037 ip_adjacency_t *adj0;
2044 p0 = vlib_get_buffer (vm, pi0);
2046 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2047 adj0 = ip_get_adjacency (lm, adj_index0);
2048 ip0 = vlib_buffer_get_current (p0);
2054 sw_if_index0 = adj0->rewrite_header.sw_if_index;
2055 vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2060 * this is the Glean case, so we are ARPing for the
2061 * packet's destination
2063 a0 ^= ip0->dst_address.data_u32;
2067 a0 ^= adj0->sub_type.nbr.next_hop.ip4.data_u32;
2071 hash_v3_finalize32 (a0, b0, c0);
2073 c0 &= BITS (hash_bitmap) - 1;
2074 c0 = c0 / BITS (uword);
2075 m0 = (uword) 1 << (c0 % BITS (uword));
2077 bm0 = hash_bitmap[c0];
2078 drop0 = (bm0 & m0) != 0;
2080 /* Mark it as seen. */
2081 hash_bitmap[c0] = bm0 | m0;
2085 to_next_drop[0] = pi0;
2087 n_left_to_next_drop -= 1;
2090 node->errors[drop0 ? IP4_ARP_ERROR_DROP :
2091 IP4_ARP_ERROR_REQUEST_SENT];
2094 * the adj has been updated to a rewrite but the node the DPO that got
2095 * us here hasn't - yet. no big deal. we'll drop while we wait.
2097 if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
2104 * Can happen if the control-plane is programming tables
2105 * with traffic flowing; at least that's today's lame excuse.
2107 if ((is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_GLEAN)
2108 || (!is_glean && adj0->lookup_next_index != IP_LOOKUP_NEXT_ARP))
2110 p0->error = node->errors[IP4_ARP_ERROR_NON_ARP_ADJ];
2113 /* Send ARP request. */
2117 ethernet_arp_header_t *h0;
2118 vnet_hw_interface_t *hw_if0;
2121 vlib_packet_template_get_packet (vm,
2122 &im->ip4_arp_request_packet_template,
2125 /* Add rewrite/encap string for ARP packet. */
2126 vnet_rewrite_one_header (adj0[0], h0,
2127 sizeof (ethernet_header_t));
2129 hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2131 /* Src ethernet address in ARP header. */
2132 clib_memcpy (h0->ip4_over_ethernet[0].ethernet,
2134 sizeof (h0->ip4_over_ethernet[0].ethernet));
2138 /* The interface's source address is stashed in the Glean Adj */
2139 h0->ip4_over_ethernet[0].ip4 =
2140 adj0->sub_type.glean.receive_addr.ip4;
2142 /* Copy in destination address we are requesting. This is the
2143 * glean case, so it's the packet's destination.*/
2144 h0->ip4_over_ethernet[1].ip4.data_u32 =
2145 ip0->dst_address.data_u32;
2149 /* Src IP address in ARP header. */
2150 if (ip4_src_address_for_packet (lm, sw_if_index0,
2152 ip4_over_ethernet[0].ip4))
2154 /* No source address available */
2156 node->errors[IP4_ARP_ERROR_NO_SOURCE_ADDRESS];
2157 vlib_buffer_free (vm, &bi0, 1);
2161 /* Copy in destination address we are requesting from the
2163 h0->ip4_over_ethernet[1].ip4.data_u32 =
2164 adj0->sub_type.nbr.next_hop.ip4.as_u32;
2167 vlib_buffer_copy_trace_flag (vm, p0, bi0);
2168 b0 = vlib_get_buffer (vm, bi0);
2169 vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index0;
2171 vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2173 vlib_set_next_frame_buffer (vm, node,
2174 adj0->rewrite_header.next_index,
2179 vlib_put_next_frame (vm, node, IP4_ARP_NEXT_DROP, n_left_to_next_drop);
2182 return frame->n_vectors;
2186 ip4_arp (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2188 return (ip4_arp_inline (vm, node, frame, 0));
2192 ip4_glean (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
2194 return (ip4_arp_inline (vm, node, frame, 1));
2197 static char *ip4_arp_error_strings[] = {
2198 [IP4_ARP_ERROR_DROP] = "address overflow drops",
2199 [IP4_ARP_ERROR_REQUEST_SENT] = "ARP requests sent",
2200 [IP4_ARP_ERROR_NON_ARP_ADJ] = "ARPs to non-ARP adjacencies",
2201 [IP4_ARP_ERROR_REPLICATE_DROP] = "ARP replication completed",
2202 [IP4_ARP_ERROR_REPLICATE_FAIL] = "ARP replication failed",
2203 [IP4_ARP_ERROR_NO_SOURCE_ADDRESS] = "no source address for ARP request",
2206 VLIB_REGISTER_NODE (ip4_arp_node) =
2208 .function = ip4_arp,.name = "ip4-arp",.vector_size =
2209 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2210 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2211 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2213 [IP4_ARP_NEXT_DROP] = "error-drop",}
2216 VLIB_REGISTER_NODE (ip4_glean_node) =
2218 .function = ip4_glean,.name = "ip4-glean",.vector_size =
2219 sizeof (u32),.format_trace = format_ip4_forward_next_trace,.n_errors =
2220 ARRAY_LEN (ip4_arp_error_strings),.error_strings =
2221 ip4_arp_error_strings,.n_next_nodes = IP4_ARP_N_NEXT,.next_nodes =
2223 [IP4_ARP_NEXT_DROP] = "error-drop",}
2226 #define foreach_notrace_ip4_arp_error \
2233 arp_notrace_init (vlib_main_t * vm)
2235 vlib_node_runtime_t *rt = vlib_node_get_runtime (vm, ip4_arp_node.index);
2237 /* don't trace ARP request packets */
2239 vnet_pcap_drop_trace_filter_add_del \
2240 (rt->errors[IP4_ARP_ERROR_##a], \
2242 foreach_notrace_ip4_arp_error;
2247 VLIB_INIT_FUNCTION (arp_notrace_init);
2250 /* Send an ARP request to see if given destination is reachable on given interface. */
2252 ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index)
2254 vnet_main_t *vnm = vnet_get_main ();
2255 ip4_main_t *im = &ip4_main;
2256 ethernet_arp_header_t *h;
2258 ip_interface_address_t *ia;
2259 ip_adjacency_t *adj;
2260 vnet_hw_interface_t *hi;
2261 vnet_sw_interface_t *si;
2265 si = vnet_get_sw_interface (vnm, sw_if_index);
2267 if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2269 return clib_error_return (0, "%U: interface %U down",
2270 format_ip4_address, dst,
2271 format_vnet_sw_if_index_name, vnm,
2276 ip4_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2279 vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2280 return clib_error_return
2282 "no matching interface address for destination %U (interface %U)",
2283 format_ip4_address, dst, format_vnet_sw_if_index_name, vnm,
2287 adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2290 vlib_packet_template_get_packet (vm,
2291 &im->ip4_arp_request_packet_template,
2294 hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2296 clib_memcpy (h->ip4_over_ethernet[0].ethernet, hi->hw_address,
2297 sizeof (h->ip4_over_ethernet[0].ethernet));
2299 h->ip4_over_ethernet[0].ip4 = src[0];
2300 h->ip4_over_ethernet[1].ip4 = dst[0];
2302 b = vlib_get_buffer (vm, bi);
2303 vnet_buffer (b)->sw_if_index[VLIB_RX] =
2304 vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2306 /* Add encapsulation string for software interface (e.g. ethernet header). */
2307 vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2308 vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2311 vlib_frame_t *f = vlib_get_frame_to_node (vm, hi->output_node_index);
2312 u32 *to_next = vlib_frame_vector_args (f);
2315 vlib_put_frame_to_node (vm, hi->output_node_index, f);
2318 return /* no error */ 0;
2323 IP4_REWRITE_NEXT_DROP,
2324 IP4_REWRITE_NEXT_ICMP_ERROR,
2325 } ip4_rewrite_next_t;
2328 ip4_rewrite_inline (vlib_main_t * vm,
2329 vlib_node_runtime_t * node,
2330 vlib_frame_t * frame,
2331 int do_counters, int is_midchain, int is_mcast)
2333 ip_lookup_main_t *lm = &ip4_main.lookup_main;
2334 u32 *from = vlib_frame_vector_args (frame);
2335 u32 n_left_from, n_left_to_next, *to_next, next_index;
2336 vlib_node_runtime_t *error_node =
2337 vlib_node_get_runtime (vm, ip4_input_node.index);
2339 n_left_from = frame->n_vectors;
2340 next_index = node->cached_next_index;
2341 u32 cpu_index = os_get_cpu_number ();
2343 while (n_left_from > 0)
2345 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2347 while (n_left_from >= 4 && n_left_to_next >= 2)
2349 ip_adjacency_t *adj0, *adj1;
2350 vlib_buffer_t *p0, *p1;
2351 ip4_header_t *ip0, *ip1;
2352 u32 pi0, rw_len0, next0, error0, checksum0, adj_index0;
2353 u32 pi1, rw_len1, next1, error1, checksum1, adj_index1;
2354 u32 tx_sw_if_index0, tx_sw_if_index1;
2356 /* Prefetch next iteration. */
2358 vlib_buffer_t *p2, *p3;
2360 p2 = vlib_get_buffer (vm, from[2]);
2361 p3 = vlib_get_buffer (vm, from[3]);
2363 vlib_prefetch_buffer_header (p2, STORE);
2364 vlib_prefetch_buffer_header (p3, STORE);
2366 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2367 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2370 pi0 = to_next[0] = from[0];
2371 pi1 = to_next[1] = from[1];
2376 n_left_to_next -= 2;
2378 p0 = vlib_get_buffer (vm, pi0);
2379 p1 = vlib_get_buffer (vm, pi1);
2381 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2382 adj_index1 = vnet_buffer (p1)->ip.adj_index[VLIB_TX];
2384 /* We should never rewrite a pkt using the MISS adjacency */
2385 ASSERT (adj_index0 && adj_index1);
2387 ip0 = vlib_buffer_get_current (p0);
2388 ip1 = vlib_buffer_get_current (p1);
2390 error0 = error1 = IP4_ERROR_NONE;
2391 next0 = next1 = IP4_REWRITE_NEXT_DROP;
2393 /* Decrement TTL & update checksum.
2394 Works either endian, so no need for byte swap. */
2395 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2397 i32 ttl0 = ip0->ttl;
2399 /* Input node should have reject packets with ttl 0. */
2400 ASSERT (ip0->ttl > 0);
2402 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2403 checksum0 += checksum0 >= 0xffff;
2405 ip0->checksum = checksum0;
2410 * If the ttl drops below 1 when forwarding, generate
2413 if (PREDICT_FALSE (ttl0 <= 0))
2415 error0 = IP4_ERROR_TIME_EXPIRED;
2416 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2417 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2418 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2420 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2423 /* Verify checksum. */
2424 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2428 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2430 if (PREDICT_TRUE (!(p1->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2432 i32 ttl1 = ip1->ttl;
2434 /* Input node should have reject packets with ttl 0. */
2435 ASSERT (ip1->ttl > 0);
2437 checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
2438 checksum1 += checksum1 >= 0xffff;
2440 ip1->checksum = checksum1;
2445 * If the ttl drops below 1 when forwarding, generate
2448 if (PREDICT_FALSE (ttl1 <= 0))
2450 error1 = IP4_ERROR_TIME_EXPIRED;
2451 vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2452 icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
2453 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2455 next1 = IP4_REWRITE_NEXT_ICMP_ERROR;
2458 /* Verify checksum. */
2459 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2460 ASSERT (ip1->checksum == ip4_header_checksum (ip1));
2464 p1->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2467 /* Rewrite packet header and updates lengths. */
2468 adj0 = ip_get_adjacency (lm, adj_index0);
2469 adj1 = ip_get_adjacency (lm, adj_index1);
2471 /* Worth pipelining. No guarantee that adj0,1 are hot... */
2472 rw_len0 = adj0[0].rewrite_header.data_bytes;
2473 rw_len1 = adj1[0].rewrite_header.data_bytes;
2474 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2475 vnet_buffer (p1)->ip.save_rewrite_length = rw_len1;
2477 /* Check MTU of outgoing interface. */
2479 (vlib_buffer_length_in_chain (vm, p0) >
2481 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2484 (vlib_buffer_length_in_chain (vm, p1) >
2486 rewrite_header.max_l3_packet_bytes ? IP4_ERROR_MTU_EXCEEDED :
2490 * pre-fetch the per-adjacency counters
2494 vlib_prefetch_combined_counter (&adjacency_counters,
2495 cpu_index, adj_index0);
2496 vlib_prefetch_combined_counter (&adjacency_counters,
2497 cpu_index, adj_index1);
2500 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2501 * to see the IP headerr */
2502 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2504 next0 = adj0[0].rewrite_header.next_index;
2505 p0->current_data -= rw_len0;
2506 p0->current_length += rw_len0;
2507 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2508 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2510 vnet_feature_arc_start (lm->output_feature_arc_index,
2511 tx_sw_if_index0, &next0, p0);
2513 if (PREDICT_TRUE (error1 == IP4_ERROR_NONE))
2515 next1 = adj1[0].rewrite_header.next_index;
2516 p1->current_data -= rw_len1;
2517 p1->current_length += rw_len1;
2519 tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
2520 vnet_buffer (p1)->sw_if_index[VLIB_TX] = tx_sw_if_index1;
2522 vnet_feature_arc_start (lm->output_feature_arc_index,
2523 tx_sw_if_index1, &next1, p1);
2526 /* Guess we are only writing on simple Ethernet header. */
2527 vnet_rewrite_two_headers (adj0[0], adj1[0],
2528 ip0, ip1, sizeof (ethernet_header_t));
2531 * Bump the per-adjacency counters
2535 vlib_increment_combined_counter
2536 (&adjacency_counters,
2539 vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2541 vlib_increment_combined_counter
2542 (&adjacency_counters,
2545 vlib_buffer_length_in_chain (vm, p1) + rw_len1);
2550 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2551 adj1->sub_type.midchain.fixup_func (vm, adj1, p1);
2556 * copy bytes from the IP address into the MAC rewrite
2558 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
2559 vnet_fixup_one_header (adj1[0], &ip1->dst_address, ip1, 1);
2562 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2563 to_next, n_left_to_next,
2564 pi0, pi1, next0, next1);
2567 while (n_left_from > 0 && n_left_to_next > 0)
2569 ip_adjacency_t *adj0;
2572 u32 pi0, rw_len0, adj_index0, next0, error0, checksum0;
2573 u32 tx_sw_if_index0;
2575 pi0 = to_next[0] = from[0];
2577 p0 = vlib_get_buffer (vm, pi0);
2579 adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2581 /* We should never rewrite a pkt using the MISS adjacency */
2582 ASSERT (adj_index0);
2584 adj0 = ip_get_adjacency (lm, adj_index0);
2586 ip0 = vlib_buffer_get_current (p0);
2588 error0 = IP4_ERROR_NONE;
2589 next0 = IP4_REWRITE_NEXT_DROP; /* drop on error */
2591 /* Decrement TTL & update checksum. */
2592 if (PREDICT_TRUE (!(p0->flags & VNET_BUFFER_LOCALLY_ORIGINATED)))
2594 i32 ttl0 = ip0->ttl;
2596 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
2598 checksum0 += checksum0 >= 0xffff;
2600 ip0->checksum = checksum0;
2602 ASSERT (ip0->ttl > 0);
2608 ASSERT (ip0->checksum == ip4_header_checksum (ip0));
2610 if (PREDICT_FALSE (ttl0 <= 0))
2613 * If the ttl drops below 1 when forwarding, generate
2616 error0 = IP4_ERROR_TIME_EXPIRED;
2617 next0 = IP4_REWRITE_NEXT_ICMP_ERROR;
2618 vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
2619 icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
2620 ICMP4_time_exceeded_ttl_exceeded_in_transit,
2626 p0->flags &= ~VNET_BUFFER_LOCALLY_ORIGINATED;
2629 vlib_prefetch_combined_counter (&adjacency_counters,
2630 cpu_index, adj_index0);
2632 /* Guess we are only writing on simple Ethernet header. */
2633 vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2637 * copy bytes from the IP address into the MAC rewrite
2639 vnet_fixup_one_header (adj0[0], &ip0->dst_address, ip0, 1);
2642 /* Update packet buffer attributes/set output interface. */
2643 rw_len0 = adj0[0].rewrite_header.data_bytes;
2644 vnet_buffer (p0)->ip.save_rewrite_length = rw_len0;
2646 vlib_increment_combined_counter
2647 (&adjacency_counters,
2649 adj_index0, 1, vlib_buffer_length_in_chain (vm, p0) + rw_len0);
2651 /* Check MTU of outgoing interface. */
2652 error0 = (vlib_buffer_length_in_chain (vm, p0)
2653 > adj0[0].rewrite_header.max_l3_packet_bytes
2654 ? IP4_ERROR_MTU_EXCEEDED : error0);
2656 p0->error = error_node->errors[error0];
2658 /* Don't adjust the buffer for ttl issue; icmp-error node wants
2659 * to see the IP headerr */
2660 if (PREDICT_TRUE (error0 == IP4_ERROR_NONE))
2662 p0->current_data -= rw_len0;
2663 p0->current_length += rw_len0;
2664 tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2666 vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2667 next0 = adj0[0].rewrite_header.next_index;
2671 adj0->sub_type.midchain.fixup_func (vm, adj0, p0);
2674 vnet_feature_arc_start (lm->output_feature_arc_index,
2675 tx_sw_if_index0, &next0, p0);
2682 n_left_to_next -= 1;
2684 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2685 to_next, n_left_to_next,
2689 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2692 /* Need to do trace after rewrites to pick up new packet data. */
2693 if (node->flags & VLIB_NODE_FLAG_TRACE)
2694 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
2696 return frame->n_vectors;
2700 /** @brief IPv4 rewrite node.
2703 This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4
2704 header checksum, fetch the ip adjacency, check the outbound mtu,
2705 apply the adjacency rewrite, and send pkts to the adjacency
2706 rewrite header's rewrite_next_index.
2708 @param vm vlib_main_t corresponding to the current thread
2709 @param node vlib_node_runtime_t
2710 @param frame vlib_frame_t whose contents should be dispatched
2712 @par Graph mechanics: buffer metadata, next index usage
2715 - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
2716 - the rewrite adjacency index
2717 - <code>adj->lookup_next_index</code>
2718 - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise
2719 the packet will be dropped.
2720 - <code>adj->rewrite_header</code>
2721 - Rewrite string length, rewrite string, next_index
2724 - <code>b->current_data, b->current_length</code>
2725 - Updated net of applying the rewrite string
2727 <em>Next Indices:</em>
2728 - <code> adj->rewrite_header.next_index </code>
2732 ip4_rewrite (vlib_main_t * vm,
2733 vlib_node_runtime_t * node, vlib_frame_t * frame)
2735 if (adj_are_counters_enabled ())
2736 return ip4_rewrite_inline (vm, node, frame, 1, 0, 0);
2738 return ip4_rewrite_inline (vm, node, frame, 0, 0, 0);
2742 ip4_midchain (vlib_main_t * vm,
2743 vlib_node_runtime_t * node, vlib_frame_t * frame)
2745 if (adj_are_counters_enabled ())
2746 return ip4_rewrite_inline (vm, node, frame, 1, 1, 0);
2748 return ip4_rewrite_inline (vm, node, frame, 0, 1, 0);
2752 ip4_rewrite_mcast (vlib_main_t * vm,
2753 vlib_node_runtime_t * node, vlib_frame_t * frame)
2755 if (adj_are_counters_enabled ())
2756 return ip4_rewrite_inline (vm, node, frame, 1, 0, 1);
2758 return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
2762 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
2763 .function = ip4_rewrite,
2764 .name = "ip4-rewrite",
2765 .vector_size = sizeof (u32),
2767 .format_trace = format_ip4_rewrite_trace,
2771 [IP4_REWRITE_NEXT_DROP] = "error-drop",
2772 [IP4_REWRITE_NEXT_ICMP_ERROR] = "ip4-icmp-error",
2775 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_node, ip4_rewrite)
2777 VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
2778 .function = ip4_rewrite_mcast,
2779 .name = "ip4-rewrite-mcast",
2780 .vector_size = sizeof (u32),
2782 .format_trace = format_ip4_rewrite_trace,
2783 .sibling_of = "ip4-rewrite",
2785 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
2787 VLIB_REGISTER_NODE (ip4_midchain_node) = {
2788 .function = ip4_midchain,
2789 .name = "ip4-midchain",
2790 .vector_size = sizeof (u32),
2791 .format_trace = format_ip4_forward_next_trace,
2792 .sibling_of = "ip4-rewrite",
2794 VLIB_NODE_FUNCTION_MULTIARCH (ip4_midchain_node, ip4_midchain);
2797 static clib_error_t *
2798 add_del_interface_table (vlib_main_t * vm,
2799 unformat_input_t * input, vlib_cli_command_t * cmd)
2801 vnet_main_t *vnm = vnet_get_main ();
2802 ip_interface_address_t *ia;
2803 clib_error_t *error = 0;
2804 u32 sw_if_index, table_id;
2808 if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2810 error = clib_error_return (0, "unknown interface `%U'",
2811 format_unformat_error, input);
2815 if (unformat (input, "%d", &table_id))
2819 error = clib_error_return (0, "expected table id `%U'",
2820 format_unformat_error, input);
2825 * If the interface already has in IP address, then a change int
2826 * VRF is not allowed. The IP address applied must first be removed.
2827 * We do not do that automatically here, since VPP has no knowledge
2828 * of whether thoses subnets are valid in the destination VRF.
2831 foreach_ip_interface_address (&ip4_main.lookup_main,
2833 1 /* honor unnumbered */,
2837 a = ip_interface_address_get_address (&ip4_main.lookup_main, ia);
2838 error = clib_error_return (0, "interface %U has address %U",
2839 format_vnet_sw_if_index_name, vnm,
2841 format_ip4_address, a);
2847 ip4_main_t *im = &ip4_main;
2850 fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2852 vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2853 im->fib_index_by_sw_if_index[sw_if_index] = fib_index;
2855 fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id);
2856 vec_validate (im->mfib_index_by_sw_if_index, sw_if_index);
2857 im->mfib_index_by_sw_if_index[sw_if_index] = fib_index;
2865 * Place the indicated interface into the supplied IPv4 FIB table (also known
2866 * as a VRF). If the FIB table does not exist, this command creates it. To
2867 * display the current IPv4 FIB table, use the command '<em>show ip fib</em>'.
2868 * FIB table will only be displayed if a route has been added to the table, or
2869 * an IP Address is assigned to an interface in the table (which adds a route
2872 * @note IP addresses added after setting the interface IP table are added to
2873 * the indicated FIB table. If an IP address is added prior to changing the
2874 * table then this is an error. The control plane must remove these addresses
2875 * first and then change the table. VPP will not automatically move the
2876 * addresses from the old to the new table as it does not know the validity
2880 * Example of how to add an interface to an IPv4 FIB table (where 2 is the table-id):
2881 * @cliexcmd{set interface ip table GigabitEthernet2/0/0 2}
2884 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) =
2886 .path = "set interface ip table",
2887 .function = add_del_interface_table,
2888 .short_help = "set interface ip table <interface> <table-id>",
2893 ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
2895 ip4_fib_mtrie_t *mtrie0;
2896 ip4_fib_mtrie_leaf_t leaf0;
2899 mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
2901 leaf0 = IP4_FIB_MTRIE_LEAF_ROOT;
2902 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 0);
2903 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 1);
2904 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
2905 leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);
2907 /* Handle default route. */
2908 leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
2910 lbi0 = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
2912 return lbi0 == ip4_fib_table_lookup_lb (ip4_fib_get (fib_index0), a);
2915 static clib_error_t *
2916 test_lookup_command_fn (vlib_main_t * vm,
2917 unformat_input_t * input, vlib_cli_command_t * cmd)
2924 ip4_address_t ip4_base_address;
2927 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
2929 if (unformat (input, "table %d", &table_id))
2931 /* Make sure the entry exists. */
2932 fib = ip4_fib_get (table_id);
2933 if ((fib) && (fib->index != table_id))
2934 return clib_error_return (0, "<fib-index> %d does not exist",
2937 else if (unformat (input, "count %f", &count))
2940 else if (unformat (input, "%U",
2941 unformat_ip4_address, &ip4_base_address))
2944 return clib_error_return (0, "unknown input `%U'",
2945 format_unformat_error, input);
2950 for (i = 0; i < n; i++)
2952 if (!ip4_lookup_validate (&ip4_base_address, table_id))
2955 ip4_base_address.as_u32 =
2956 clib_host_to_net_u32 (1 +
2957 clib_net_to_host_u32 (ip4_base_address.as_u32));
2961 vlib_cli_output (vm, "%llu errors out of %d lookups\n", errors, n);
2963 vlib_cli_output (vm, "No errors in %d lookups\n", n);
2969 * Perform a lookup of an IPv4 Address (or range of addresses) in the
2970 * given FIB table to determine if there is a conflict with the
2971 * adjacency table. The fib-id can be determined by using the
2972 * '<em>show ip fib</em>' command. If fib-id is not entered, default value
2975 * @todo This command uses fib-id, other commands use table-id (not
2976 * just a name, they are different indexes). Would like to change this
2977 * to table-id for consistency.
2980 * Example of how to run the test lookup command:
2981 * @cliexstart{test lookup 172.16.1.1 table 1 count 2}
2982 * No errors in 2 lookups
2986 VLIB_CLI_COMMAND (lookup_test_command, static) =
2988 .path = "test lookup",
2989 .short_help = "test lookup <ipv4-addr> [table <fib-id>] [count <nn>]",
2990 .function = test_lookup_command_fn,
2995 vnet_set_ip4_flow_hash (u32 table_id, u32 flow_hash_config)
2997 ip4_main_t *im4 = &ip4_main;
2999 uword *p = hash_get (im4->fib_index_by_table_id, table_id);
3002 return VNET_API_ERROR_NO_SUCH_FIB;
3004 fib = ip4_fib_get (p[0]);
3006 fib->flow_hash_config = flow_hash_config;
3010 static clib_error_t *
3011 set_ip_flow_hash_command_fn (vlib_main_t * vm,
3012 unformat_input_t * input,
3013 vlib_cli_command_t * cmd)
3017 u32 flow_hash_config = 0;
3020 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3022 if (unformat (input, "table %d", &table_id))
3025 else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3026 foreach_flow_hash_bit
3033 return clib_error_return (0, "unknown input `%U'",
3034 format_unformat_error, input);
3036 rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);
3042 case VNET_API_ERROR_NO_SUCH_FIB:
3043 return clib_error_return (0, "no such FIB table %d", table_id);
3046 clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3054 * Configure the set of IPv4 fields used by the flow hash.
3057 * Example of how to set the flow hash on a given table:
3058 * @cliexcmd{set ip flow-hash table 7 dst sport dport proto}
3059 * Example of display the configured flow hash:
3060 * @cliexstart{show ip fib}
3061 * ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
3064 * [@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
3065 * [0] [@0]: dpo-drop ip6
3068 * [@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
3069 * [0] [@0]: dpo-drop ip6
3072 * [@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
3073 * [0] [@0]: dpo-drop ip6
3076 * [@0]: dpo-load-balance: [index:30 buckets:1 uRPF:29 to:[0:0]]
3077 * [0] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3080 * [@0]: dpo-load-balance: [index:31 buckets:4 uRPF:30 to:[0:0]]
3081 * [0] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3082 * [1] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3083 * [2] [@3]: arp-ipv4: via 6.0.0.2 af_packet0
3084 * [3] [@3]: arp-ipv4: via 6.0.0.1 af_packet0
3087 * [@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
3088 * [0] [@0]: dpo-drop ip6
3089 * 255.255.255.255/32
3091 * [@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
3092 * [0] [@0]: dpo-drop ip6
3093 * ipv4-VRF:7, fib_index 1, flow hash: dst sport dport proto
3096 * [@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
3097 * [0] [@0]: dpo-drop ip6
3100 * [@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
3101 * [0] [@0]: dpo-drop ip6
3104 * [@0]: dpo-load-balance: [index:17 buckets:1 uRPF:16 to:[0:0]]
3105 * [0] [@4]: ipv4-glean: af_packet0
3108 * [@0]: dpo-load-balance: [index:18 buckets:1 uRPF:17 to:[1:84]]
3109 * [0] [@2]: dpo-receive: 172.16.1.1 on af_packet0
3112 * [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
3113 * [0] [@5]: ipv4 via 172.16.1.2 af_packet0: IP4: 02:fe:9e:70:7a:2b -> 26:a5:f6:9c:3a:36
3116 * [@0]: dpo-load-balance: [index:19 buckets:1 uRPF:18 to:[0:0]]
3117 * [0] [@4]: ipv4-glean: af_packet1
3120 * [@0]: dpo-load-balance: [index:20 buckets:1 uRPF:19 to:[0:0]]
3121 * [0] [@2]: dpo-receive: 172.16.2.1 on af_packet1
3124 * [@0]: dpo-load-balance: [index:15 buckets:1 uRPF:14 to:[0:0]]
3125 * [0] [@0]: dpo-drop ip6
3128 * [@0]: dpo-load-balance: [index:14 buckets:1 uRPF:13 to:[0:0]]
3129 * [0] [@0]: dpo-drop ip6
3130 * 255.255.255.255/32
3132 * [@0]: dpo-load-balance: [index:16 buckets:1 uRPF:15 to:[0:0]]
3133 * [0] [@0]: dpo-drop ip6
3137 VLIB_CLI_COMMAND (set_ip_flow_hash_command, static) =
3139 .path = "set ip flow-hash",
3141 "set ip flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
3142 .function = set_ip_flow_hash_command_fn,
3147 vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3150 vnet_main_t *vnm = vnet_get_main ();
3151 vnet_interface_main_t *im = &vnm->interface_main;
3152 ip4_main_t *ipm = &ip4_main;
3153 ip_lookup_main_t *lm = &ipm->lookup_main;
3154 vnet_classify_main_t *cm = &vnet_classify_main;
3155 ip4_address_t *if_addr;
3157 if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3158 return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3160 if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3161 return VNET_API_ERROR_NO_SUCH_ENTRY;
3163 vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3164 lm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
3166 if_addr = ip4_interface_first_address (ipm, sw_if_index, NULL);
3168 if (NULL != if_addr)
3170 fib_prefix_t pfx = {
3172 .fp_proto = FIB_PROTOCOL_IP4,
3173 .fp_addr.ip4 = *if_addr,
3177 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
3181 if (table_index != (u32) ~ 0)
3183 dpo_id_t dpo = DPO_INVALID;
3188 classify_dpo_create (DPO_PROTO_IP4, table_index));
3190 fib_table_entry_special_dpo_add (fib_index,
3192 FIB_SOURCE_CLASSIFY,
3193 FIB_ENTRY_FLAG_NONE, &dpo);
3198 fib_table_entry_special_remove (fib_index,
3199 &pfx, FIB_SOURCE_CLASSIFY);
3206 static clib_error_t *
3207 set_ip_classify_command_fn (vlib_main_t * vm,
3208 unformat_input_t * input,
3209 vlib_cli_command_t * cmd)
3211 u32 table_index = ~0;
3212 int table_index_set = 0;
3213 u32 sw_if_index = ~0;
3216 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
3218 if (unformat (input, "table-index %d", &table_index))
3219 table_index_set = 1;
3220 else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3221 vnet_get_main (), &sw_if_index))
3227 if (table_index_set == 0)
3228 return clib_error_return (0, "classify table-index must be specified");
3230 if (sw_if_index == ~0)
3231 return clib_error_return (0, "interface / subif must be specified");
3233 rv = vnet_set_ip4_classify_intfc (vm, sw_if_index, table_index);
3240 case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3241 return clib_error_return (0, "No such interface");
3243 case VNET_API_ERROR_NO_SUCH_ENTRY:
3244 return clib_error_return (0, "No such classifier table");
3250 * Assign a classification table to an interface. The classification
3251 * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3252 * commands. Once the table is create, use this command to filter packets
3256 * Example of how to assign a classification table to an interface:
3257 * @cliexcmd{set ip classify intfc GigabitEthernet2/0/0 table-index 1}
3260 VLIB_CLI_COMMAND (set_ip_classify_command, static) =
3262 .path = "set ip classify",
3264 "set ip classify intfc <interface> table-index <classify-idx>",
3265 .function = set_ip_classify_command_fn,
3270 * fd.io coding-style-patch-verification: ON
3273 * eval: (c-set-style "gnu")