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_NONXT))
141 /* Remove IP header and extensions */
142 vlib_buffer_advance (b0, encap_len);
144 if (hdr_type == IP_PROTOCOL_IP6_NONXT)
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;
174 from = vlib_frame_vector_args (frame);
175 n_left_from = frame->n_vectors;
176 next_index = node->cached_next_index;
178 while (n_left_from > 0)
182 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
184 /* TODO: Dual/quad loop */
186 while (n_left_from > 0 && n_left_to_next > 0)
190 ip6_header_t *ip0 = 0;
191 ip6_sr_localsid_t *ls0;
192 u32 next0 = SRV6_AS_LOCALSID_NEXT_ERROR;
201 b0 = vlib_get_buffer (vm, bi0);
202 ip0 = vlib_buffer_get_current (b0);
204 /* Lookup the SR End behavior based on IP DA (adj) */
205 ls0 = pool_elt_at_index (sm->localsids,
206 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
209 end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
211 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
213 srv6_as_localsid_trace_t *tr =
214 vlib_add_trace (vm, node, b0, sizeof *tr);
215 tr->localsid_index = ls0 - sm->localsids;
218 /* This increments the SRv6 per LocalSID counters. */
219 vlib_increment_combined_counter (((next0 ==
220 SRV6_AS_LOCALSID_NEXT_ERROR) ?
221 &(sm->sr_ls_invalid_counters) :
222 &(sm->sr_ls_valid_counters)),
224 ls0 - sm->localsids, 1,
225 vlib_buffer_length_in_chain (vm,
228 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
229 n_left_to_next, bi0, next0);
234 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
237 return frame->n_vectors;
241 VLIB_REGISTER_NODE (srv6_as_localsid_node) = {
242 .function = srv6_as_localsid_fn,
243 .name = "srv6-as-localsid",
244 .vector_size = sizeof (u32),
245 .format_trace = format_srv6_as_localsid_trace,
246 .type = VLIB_NODE_TYPE_INTERNAL,
247 .n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
249 [SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
250 [SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
251 [SRV6_AS_LOCALSID_NEXT_INTERFACE] = "interface-output",
252 [SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
258 /******************************* Rewriting node *******************************/
261 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
264 srv6_as2_rewrite_fn (vlib_main_t * vm,
265 vlib_node_runtime_t * node, vlib_frame_t * frame)
267 ip6_sr_main_t *srm = &sr_main;
268 srv6_as_main_t *sm = &srv6_as_main;
269 u32 n_left_from, next_index, *from, *to_next;
272 from = vlib_frame_vector_args (frame);
273 n_left_from = frame->n_vectors;
274 next_index = node->cached_next_index;
276 while (n_left_from > 0)
280 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
282 /* TODO: Dual/quad loop */
284 while (n_left_from > 0 && n_left_to_next > 0)
288 ethernet_header_t *en0;
289 ip6_header_t *ip0 = 0;
290 ip6_sr_localsid_t *ls0;
291 srv6_as_localsid_t *ls0_mem;
292 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
301 b0 = vlib_get_buffer (vm, bi0);
302 en0 = vlib_buffer_get_current (b0);
303 ls0 = pool_elt_at_index (srm->localsids,
304 sm->sw_iface_localsid2[vnet_buffer
307 ls0_mem = ls0->plugin_mem;
309 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
311 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
312 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
316 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
317 (vec_len (ls0_mem->rewrite) + b0->current_data));
319 clib_memcpy_fast (((u8 *) en0) - vec_len (ls0_mem->rewrite),
320 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
321 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
323 ip0 = vlib_buffer_get_current (b0);
325 ip0->payload_length =
326 clib_host_to_net_u16 (b0->current_length -
327 sizeof (ip6_header_t));
330 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
331 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
333 srv6_as_rewrite_trace_t *tr =
334 vlib_add_trace (vm, node, b0, sizeof *tr);
337 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
343 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
344 sizeof tr->src.as_u8);
345 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
346 sizeof tr->dst.as_u8);
350 /* Increment per-SID AS rewrite counters */
351 vlib_increment_combined_counter (((next0 ==
352 SRV6_AS_LOCALSID_NEXT_ERROR) ?
353 &(sm->invalid_counters) :
354 &(sm->valid_counters)),
355 vm->thread_index, ls0_mem->index,
356 1, vlib_buffer_length_in_chain (vm,
359 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
360 n_left_to_next, bi0, next0);
365 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
368 /* Update counters */
369 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
370 SRV6_AS_REWRITE_COUNTER_PROCESSED,
373 return frame->n_vectors;
377 VLIB_REGISTER_NODE (srv6_as2_rewrite_node) = {
378 .function = srv6_as2_rewrite_fn,
379 .name = "srv6-as2-rewrite",
380 .vector_size = sizeof (u32),
381 .format_trace = format_srv6_as_rewrite_trace,
382 .type = VLIB_NODE_TYPE_INTERNAL,
383 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
384 .error_strings = srv6_as_rewrite_counter_strings,
385 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
387 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
388 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
395 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
398 srv6_as4_rewrite_fn (vlib_main_t * vm,
399 vlib_node_runtime_t * node, vlib_frame_t * frame)
401 ip6_sr_main_t *srm = &sr_main;
402 srv6_as_main_t *sm = &srv6_as_main;
403 u32 n_left_from, next_index, *from, *to_next;
406 from = vlib_frame_vector_args (frame);
407 n_left_from = frame->n_vectors;
408 next_index = node->cached_next_index;
410 while (n_left_from > 0)
414 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
416 /* TODO: Dual/quad loop */
418 while (n_left_from > 0 && n_left_to_next > 0)
422 ip4_header_t *ip0_encap = 0;
423 ip6_header_t *ip0 = 0;
424 ip6_sr_localsid_t *ls0;
425 srv6_as_localsid_t *ls0_mem;
426 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
436 b0 = vlib_get_buffer (vm, bi0);
437 ip0_encap = vlib_buffer_get_current (b0);
438 ls0 = pool_elt_at_index (srm->localsids,
439 sm->sw_iface_localsid4[vnet_buffer
442 ls0_mem = ls0->plugin_mem;
444 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
446 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
447 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
451 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
452 (vec_len (ls0_mem->rewrite) + b0->current_data));
454 clib_memcpy_fast (((u8 *) ip0_encap) -
455 vec_len (ls0_mem->rewrite), ls0_mem->rewrite,
456 vec_len (ls0_mem->rewrite));
457 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
459 ip0 = vlib_buffer_get_current (b0);
461 /* Update inner IPv4 TTL and checksum */
464 checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
465 checksum0 += checksum0 >= 0xffff;
466 ip0_encap->checksum = checksum0;
468 /* Update outer IPv6 length (in case it has changed) */
469 new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
470 clib_net_to_host_u16 (ip0_encap->length);
471 ip0->payload_length = clib_host_to_net_u16 (new_l0);
474 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
475 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
477 srv6_as_rewrite_trace_t *tr =
478 vlib_add_trace (vm, node, b0, sizeof *tr);
481 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
487 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
488 sizeof tr->src.as_u8);
489 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
490 sizeof tr->dst.as_u8);
494 /* Increment per-SID AS rewrite counters */
495 vlib_increment_combined_counter (((next0 ==
496 SRV6_AS_LOCALSID_NEXT_ERROR) ?
497 &(sm->invalid_counters) :
498 &(sm->valid_counters)),
499 vm->thread_index, ls0_mem->index,
500 1, vlib_buffer_length_in_chain (vm,
503 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
504 n_left_to_next, bi0, next0);
509 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
512 /* Update counters */
513 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
514 SRV6_AS_REWRITE_COUNTER_PROCESSED,
517 return frame->n_vectors;
521 VLIB_REGISTER_NODE (srv6_as4_rewrite_node) = {
522 .function = srv6_as4_rewrite_fn,
523 .name = "srv6-as4-rewrite",
524 .vector_size = sizeof (u32),
525 .format_trace = format_srv6_as_rewrite_trace,
526 .type = VLIB_NODE_TYPE_INTERNAL,
527 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
528 .error_strings = srv6_as_rewrite_counter_strings,
529 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
531 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
532 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
539 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
542 srv6_as6_rewrite_fn (vlib_main_t * vm,
543 vlib_node_runtime_t * node, vlib_frame_t * frame)
545 ip6_sr_main_t *srm = &sr_main;
546 srv6_as_main_t *sm = &srv6_as_main;
547 u32 n_left_from, next_index, *from, *to_next;
550 from = vlib_frame_vector_args (frame);
551 n_left_from = frame->n_vectors;
552 next_index = node->cached_next_index;
554 while (n_left_from > 0)
558 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
560 /* TODO: Dual/quad loop */
562 while (n_left_from > 0 && n_left_to_next > 0)
566 ip6_header_t *ip0 = 0, *ip0_encap = 0;
567 ip6_sr_localsid_t *ls0;
568 srv6_as_localsid_t *ls0_mem;
569 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
579 b0 = vlib_get_buffer (vm, bi0);
580 ip0_encap = vlib_buffer_get_current (b0);
581 ls0 = pool_elt_at_index (srm->localsids,
582 sm->sw_iface_localsid6[vnet_buffer
585 ls0_mem = ls0->plugin_mem;
587 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
589 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
590 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
594 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
595 (vec_len (ls0_mem->rewrite) + b0->current_data));
597 clib_memcpy_fast (((u8 *) ip0_encap) -
598 vec_len (ls0_mem->rewrite), ls0_mem->rewrite,
599 vec_len (ls0_mem->rewrite));
600 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
602 ip0 = vlib_buffer_get_current (b0);
604 /* Update inner IPv6 hop limit */
605 ip0_encap->hop_limit -= 1;
607 /* Update outer IPv6 length (in case it has changed) */
608 new_l0 = vec_len (ls0_mem->rewrite) +
609 clib_net_to_host_u16 (ip0_encap->payload_length);
610 ip0->payload_length = clib_host_to_net_u16 (new_l0);
613 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
614 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
616 srv6_as_rewrite_trace_t *tr =
617 vlib_add_trace (vm, node, b0, sizeof *tr);
620 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
626 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
627 sizeof tr->src.as_u8);
628 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
629 sizeof tr->dst.as_u8);
633 /* Increment per-SID AS rewrite counters */
634 vlib_increment_combined_counter (((next0 ==
635 SRV6_AS_LOCALSID_NEXT_ERROR) ?
636 &(sm->invalid_counters) :
637 &(sm->valid_counters)),
638 vm->thread_index, ls0_mem->index,
639 1, vlib_buffer_length_in_chain (vm,
642 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
643 n_left_to_next, bi0, next0);
648 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
651 /* Update counters */
652 vlib_node_increment_counter (vm, srv6_as6_rewrite_node.index,
653 SRV6_AS_REWRITE_COUNTER_PROCESSED,
656 return frame->n_vectors;
660 VLIB_REGISTER_NODE (srv6_as6_rewrite_node) = {
661 .function = srv6_as6_rewrite_fn,
662 .name = "srv6-as6-rewrite",
663 .vector_size = sizeof (u32),
664 .format_trace = format_srv6_as_rewrite_trace,
665 .type = VLIB_NODE_TYPE_INTERNAL,
666 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
667 .error_strings = srv6_as_rewrite_counter_strings,
668 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
670 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
671 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
677 * fd.io coding-style-patch-verification: ON
680 * eval: (c-set-style "gnu")