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.
15 #include <vlib/vlib.h>
16 #include <vnet/vnet.h>
17 #include <vppinfra/error.h>
18 #include <srv6-as/as.h>
21 /******************************* Packet tracing *******************************/
26 } srv6_as_localsid_trace_t;
31 ip6_address_t src, dst;
32 } srv6_as_rewrite_trace_t;
35 format_srv6_as_localsid_trace (u8 * s, va_list * args)
37 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
38 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
39 srv6_as_localsid_trace_t *t = va_arg (*args, srv6_as_localsid_trace_t *);
41 return format (s, "SRv6-AS-localsid: localsid_index %d", t->localsid_index);
45 format_srv6_as_rewrite_trace (u8 * s, va_list * args)
47 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
48 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
49 srv6_as_rewrite_trace_t *t = va_arg (*args, srv6_as_rewrite_trace_t *);
51 if (PREDICT_FALSE (t->error != 0))
53 return format (s, "SRv6-AS-rewrite: cache is empty");
56 return format (s, "SRv6-AS-rewrite: src %U dst %U",
57 format_ip6_address, &t->src, format_ip6_address, &t->dst);
61 /***************************** Nodes registration *****************************/
63 vlib_node_registration_t srv6_as4_rewrite_node;
64 vlib_node_registration_t srv6_as6_rewrite_node;
67 /****************************** Packet counters *******************************/
69 #define foreach_srv6_as_rewrite_counter \
70 _(PROCESSED, "srv6-as rewritten packets") \
71 _(NO_RW, "(Error) No header for rewriting.")
75 #define _(sym,str) SRV6_AS_REWRITE_COUNTER_##sym,
76 foreach_srv6_as_rewrite_counter
78 SRV6_AS_REWRITE_N_COUNTERS,
79 } srv6_as_rewrite_counters;
81 static char *srv6_as_rewrite_counter_strings[] = {
82 #define _(sym,string) string,
83 foreach_srv6_as_rewrite_counter
88 /********************************* Next nodes *********************************/
92 SRV6_AS_LOCALSID_NEXT_ERROR,
93 SRV6_AS_LOCALSID_NEXT_REWRITE4,
94 SRV6_AS_LOCALSID_NEXT_REWRITE6,
95 SRV6_AS_LOCALSID_NEXT_INTERFACE,
96 SRV6_AS_LOCALSID_N_NEXT,
97 } srv6_as_localsid_next_t;
101 SRV6_AS_REWRITE_NEXT_ERROR,
102 SRV6_AS_REWRITE_NEXT_LOOKUP,
103 SRV6_AS_REWRITE_N_NEXT,
104 } srv6_as_rewrite_next_t;
107 /******************************* Local SID node *******************************/
110 * @brief Function doing SRH processing for AS behavior
112 static_always_inline void
113 end_as_processing (vlib_buffer_t * b0,
115 srv6_as_localsid_t * ls0_mem, u32 * next0)
118 ip6_ext_header_t *ext_hdr;
121 /* Compute encapsulation headers length */
122 encap_len = sizeof (ip6_header_t);
123 ext_hdr = (ip6_ext_header_t *) (ip0 + 1);
124 hdr_type = ip0->protocol;
126 while (ip6_ext_hdr (hdr_type))
128 encap_len += ip6_ext_header_len (ext_hdr);
129 hdr_type = ext_hdr->next_hdr;
130 ext_hdr = ip6_ext_next_header (ext_hdr);
133 /* Make sure next header is valid */
134 if (PREDICT_FALSE (hdr_type != IP_PROTOCOL_IPV6 &&
135 hdr_type != IP_PROTOCOL_IP_IN_IP &&
136 hdr_type != IP_PROTOCOL_IP6_ETHERNET))
141 /* Remove IP header and extensions */
142 vlib_buffer_advance (b0, encap_len);
144 if (hdr_type == IP_PROTOCOL_IP6_ETHERNET)
146 /* Set output interface */
147 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0_mem->sw_if_index_out;
149 /* Set next node to interface-output */
150 *next0 = SRV6_AS_LOCALSID_NEXT_INTERFACE;
154 /* Set Xconnect adjacency to VNF */
155 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
157 /* Set next node to ip-rewrite */
158 *next0 = (hdr_type == IP_PROTOCOL_IPV6) ?
159 SRV6_AS_LOCALSID_NEXT_REWRITE6 : SRV6_AS_LOCALSID_NEXT_REWRITE4;
164 * @brief SRv6 AS Localsid graph node
167 srv6_as_localsid_fn (vlib_main_t * vm,
168 vlib_node_runtime_t * node, vlib_frame_t * frame)
170 ip6_sr_main_t *sm = &sr_main;
171 u32 n_left_from, next_index, *from, *to_next;
173 from = vlib_frame_vector_args (frame);
174 n_left_from = frame->n_vectors;
175 next_index = node->cached_next_index;
177 while (n_left_from > 0)
181 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
183 /* TODO: Dual/quad loop */
185 while (n_left_from > 0 && n_left_to_next > 0)
189 ip6_header_t *ip0 = 0;
190 ip6_sr_localsid_t *ls0;
191 u32 next0 = SRV6_AS_LOCALSID_NEXT_ERROR;
200 b0 = vlib_get_buffer (vm, bi0);
201 ip0 = vlib_buffer_get_current (b0);
203 /* Lookup the SR End behavior based on IP DA (adj) */
204 ls0 = pool_elt_at_index (sm->localsids,
205 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
208 end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
210 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
212 srv6_as_localsid_trace_t *tr =
213 vlib_add_trace (vm, node, b0, sizeof *tr);
214 tr->localsid_index = ls0 - sm->localsids;
217 /* This increments the SRv6 per LocalSID counters. */
218 vlib_increment_combined_counter (((next0 ==
219 SRV6_AS_LOCALSID_NEXT_ERROR) ?
220 &(sm->sr_ls_invalid_counters) :
221 &(sm->sr_ls_valid_counters)),
223 ls0 - sm->localsids, 1,
224 vlib_buffer_length_in_chain (vm,
227 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
228 n_left_to_next, bi0, next0);
231 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
234 return frame->n_vectors;
237 VLIB_REGISTER_NODE (srv6_as_localsid_node) = {
238 .function = srv6_as_localsid_fn,
239 .name = "srv6-as-localsid",
240 .vector_size = sizeof (u32),
241 .format_trace = format_srv6_as_localsid_trace,
242 .type = VLIB_NODE_TYPE_INTERNAL,
243 .n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
245 [SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
246 [SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
247 [SRV6_AS_LOCALSID_NEXT_INTERFACE] = "interface-output",
248 [SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
253 /******************************* Rewriting node *******************************/
256 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
259 srv6_as2_rewrite_fn (vlib_main_t * vm,
260 vlib_node_runtime_t * node, vlib_frame_t * frame)
262 ip6_sr_main_t *srm = &sr_main;
263 srv6_as_main_t *sm = &srv6_as_main;
264 u32 n_left_from, next_index, *from, *to_next;
267 from = vlib_frame_vector_args (frame);
268 n_left_from = frame->n_vectors;
269 next_index = node->cached_next_index;
271 while (n_left_from > 0)
275 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
277 /* TODO: Dual/quad loop */
279 while (n_left_from > 0 && n_left_to_next > 0)
283 ethernet_header_t *en0;
284 ip6_header_t *ip0 = 0;
285 ip6_sr_localsid_t *ls0;
286 srv6_as_localsid_t *ls0_mem;
287 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
296 b0 = vlib_get_buffer (vm, bi0);
297 en0 = vlib_buffer_get_current (b0);
298 ls0 = pool_elt_at_index (srm->localsids,
299 sm->sw_iface_localsid2[vnet_buffer
302 ls0_mem = ls0->plugin_mem;
304 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
306 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
307 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
311 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
312 (vec_len (ls0_mem->rewrite) + b0->current_data));
314 clib_memcpy_fast (((u8 *) en0) - vec_len (ls0_mem->rewrite),
315 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
316 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
318 ip0 = vlib_buffer_get_current (b0);
320 ip0->payload_length =
321 clib_host_to_net_u16 (b0->current_length -
322 sizeof (ip6_header_t));
325 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
326 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
328 srv6_as_rewrite_trace_t *tr =
329 vlib_add_trace (vm, node, b0, sizeof *tr);
332 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
338 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
339 sizeof tr->src.as_u8);
340 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
341 sizeof tr->dst.as_u8);
345 /* Increment per-SID AS rewrite counters */
346 vlib_increment_combined_counter (((next0 ==
347 SRV6_AS_LOCALSID_NEXT_ERROR) ?
348 &(sm->invalid_counters) :
349 &(sm->valid_counters)),
350 vm->thread_index, ls0_mem->index,
351 1, vlib_buffer_length_in_chain (vm,
354 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
355 n_left_to_next, bi0, next0);
360 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
363 /* Update counters */
364 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
365 SRV6_AS_REWRITE_COUNTER_PROCESSED,
368 return frame->n_vectors;
371 VLIB_REGISTER_NODE (srv6_as2_rewrite_node) = {
372 .function = srv6_as2_rewrite_fn,
373 .name = "srv6-as2-rewrite",
374 .vector_size = sizeof (u32),
375 .format_trace = format_srv6_as_rewrite_trace,
376 .type = VLIB_NODE_TYPE_INTERNAL,
377 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
378 .error_strings = srv6_as_rewrite_counter_strings,
379 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
381 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
382 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
388 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
391 srv6_as4_rewrite_fn (vlib_main_t * vm,
392 vlib_node_runtime_t * node, vlib_frame_t * frame)
394 ip6_sr_main_t *srm = &sr_main;
395 srv6_as_main_t *sm = &srv6_as_main;
396 u32 n_left_from, next_index, *from, *to_next;
399 from = vlib_frame_vector_args (frame);
400 n_left_from = frame->n_vectors;
401 next_index = node->cached_next_index;
403 while (n_left_from > 0)
407 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
409 /* TODO: Dual/quad loop */
411 while (n_left_from > 0 && n_left_to_next > 0)
415 ip4_header_t *ip0_encap = 0;
416 ip6_header_t *ip0 = 0;
417 ip6_sr_localsid_t *ls0;
418 srv6_as_localsid_t *ls0_mem;
419 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
429 b0 = vlib_get_buffer (vm, bi0);
430 ip0_encap = vlib_buffer_get_current (b0);
431 ls0 = pool_elt_at_index (srm->localsids,
432 sm->sw_iface_localsid4[vnet_buffer
435 ls0_mem = ls0->plugin_mem;
437 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
439 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
440 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
444 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
445 (vec_len (ls0_mem->rewrite) + b0->current_data));
447 clib_memcpy_fast (((u8 *) ip0_encap) -
448 vec_len (ls0_mem->rewrite), ls0_mem->rewrite,
449 vec_len (ls0_mem->rewrite));
450 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
452 ip0 = vlib_buffer_get_current (b0);
454 /* Update inner IPv4 TTL and checksum */
457 checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
458 checksum0 += checksum0 >= 0xffff;
459 ip0_encap->checksum = checksum0;
461 /* Update outer IPv6 length (in case it has changed) */
462 new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
463 clib_net_to_host_u16 (ip0_encap->length);
464 ip0->payload_length = clib_host_to_net_u16 (new_l0);
467 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
468 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
470 srv6_as_rewrite_trace_t *tr =
471 vlib_add_trace (vm, node, b0, sizeof *tr);
474 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
480 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
481 sizeof tr->src.as_u8);
482 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
483 sizeof tr->dst.as_u8);
487 /* Increment per-SID AS rewrite counters */
488 vlib_increment_combined_counter (((next0 ==
489 SRV6_AS_LOCALSID_NEXT_ERROR) ?
490 &(sm->invalid_counters) :
491 &(sm->valid_counters)),
492 vm->thread_index, ls0_mem->index,
493 1, vlib_buffer_length_in_chain (vm,
496 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
497 n_left_to_next, bi0, next0);
502 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
505 /* Update counters */
506 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
507 SRV6_AS_REWRITE_COUNTER_PROCESSED,
510 return frame->n_vectors;
513 VLIB_REGISTER_NODE (srv6_as4_rewrite_node) = {
514 .function = srv6_as4_rewrite_fn,
515 .name = "srv6-as4-rewrite",
516 .vector_size = sizeof (u32),
517 .format_trace = format_srv6_as_rewrite_trace,
518 .type = VLIB_NODE_TYPE_INTERNAL,
519 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
520 .error_strings = srv6_as_rewrite_counter_strings,
521 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
523 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
524 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
530 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
533 srv6_as6_rewrite_fn (vlib_main_t * vm,
534 vlib_node_runtime_t * node, vlib_frame_t * frame)
536 ip6_sr_main_t *srm = &sr_main;
537 srv6_as_main_t *sm = &srv6_as_main;
538 u32 n_left_from, next_index, *from, *to_next;
541 from = vlib_frame_vector_args (frame);
542 n_left_from = frame->n_vectors;
543 next_index = node->cached_next_index;
545 while (n_left_from > 0)
549 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
551 /* TODO: Dual/quad loop */
553 while (n_left_from > 0 && n_left_to_next > 0)
557 ip6_header_t *ip0 = 0, *ip0_encap = 0;
558 ip6_sr_localsid_t *ls0;
559 srv6_as_localsid_t *ls0_mem;
560 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
570 b0 = vlib_get_buffer (vm, bi0);
571 ip0_encap = vlib_buffer_get_current (b0);
572 ls0 = pool_elt_at_index (srm->localsids,
573 sm->sw_iface_localsid6[vnet_buffer
576 ls0_mem = ls0->plugin_mem;
578 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
580 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
581 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
585 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
586 (vec_len (ls0_mem->rewrite) + b0->current_data));
588 clib_memcpy_fast (((u8 *) ip0_encap) -
589 vec_len (ls0_mem->rewrite), ls0_mem->rewrite,
590 vec_len (ls0_mem->rewrite));
591 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
593 ip0 = vlib_buffer_get_current (b0);
595 /* Update inner IPv6 hop limit */
596 ip0_encap->hop_limit -= 1;
598 /* Update outer IPv6 length (in case it has changed) */
599 new_l0 = vec_len (ls0_mem->rewrite) +
600 clib_net_to_host_u16 (ip0_encap->payload_length);
601 ip0->payload_length = clib_host_to_net_u16 (new_l0);
604 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
605 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
607 srv6_as_rewrite_trace_t *tr =
608 vlib_add_trace (vm, node, b0, sizeof *tr);
611 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
617 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
618 sizeof tr->src.as_u8);
619 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
620 sizeof tr->dst.as_u8);
624 /* Increment per-SID AS rewrite counters */
625 vlib_increment_combined_counter (((next0 ==
626 SRV6_AS_LOCALSID_NEXT_ERROR) ?
627 &(sm->invalid_counters) :
628 &(sm->valid_counters)),
629 vm->thread_index, ls0_mem->index,
630 1, vlib_buffer_length_in_chain (vm,
633 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
634 n_left_to_next, bi0, next0);
639 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
642 /* Update counters */
643 vlib_node_increment_counter (vm, srv6_as6_rewrite_node.index,
644 SRV6_AS_REWRITE_COUNTER_PROCESSED,
647 return frame->n_vectors;
650 VLIB_REGISTER_NODE (srv6_as6_rewrite_node) = {
651 .function = srv6_as6_rewrite_fn,
652 .name = "srv6-as6-rewrite",
653 .vector_size = sizeof (u32),
654 .format_trace = format_srv6_as_rewrite_trace,
655 .type = VLIB_NODE_TYPE_INTERNAL,
656 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
657 .error_strings = srv6_as_rewrite_counter_strings,
658 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
660 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
661 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
666 * fd.io coding-style-patch-verification: ON
669 * eval: (c-set-style "gnu")