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_N_NEXT,
96 } srv6_as_localsid_next_t;
100 SRV6_AS_REWRITE_NEXT_ERROR,
101 SRV6_AS_REWRITE_NEXT_LOOKUP,
102 SRV6_AS_REWRITE_N_NEXT,
103 } srv6_as_rewrite_next_t;
106 /******************************* Local SID node *******************************/
109 * @brief Function doing SRH processing for AS behavior
111 static_always_inline void
112 end_as_processing (vlib_buffer_t * b0,
114 srv6_as_localsid_t * ls0_mem, u32 * next0)
117 ip6_ext_header_t *ext_hdr;
120 /* Compute encapsulation headers length */
121 encap_len = sizeof (ip6_header_t);
122 ext_hdr = (ip6_ext_header_t *) (ip0 + 1);
123 hdr_type = ip0->protocol;
125 while (ip6_ext_hdr (hdr_type))
127 encap_len += ip6_ext_header_len (ext_hdr);
128 hdr_type = ext_hdr->next_hdr;
129 ext_hdr = ip6_ext_next_header (ext_hdr);
132 /* Make sure next header is IP */
133 if (PREDICT_FALSE (hdr_type != IP_PROTOCOL_IPV6 &&
134 hdr_type != IP_PROTOCOL_IP_IN_IP))
139 /* Remove IP header and extensions */
140 vlib_buffer_advance (b0, encap_len);
142 /* Set Xconnect adjacency to VNF */
143 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
145 if (ls0_mem->ip_version == DA_IP4)
146 *next0 = SRV6_AS_LOCALSID_NEXT_REWRITE4;
147 else if (ls0_mem->ip_version == DA_IP6)
148 *next0 = SRV6_AS_LOCALSID_NEXT_REWRITE6;
152 * @brief SRv6 AS Localsid graph node
155 srv6_as_localsid_fn (vlib_main_t * vm,
156 vlib_node_runtime_t * node, vlib_frame_t * frame)
158 ip6_sr_main_t *sm = &sr_main;
159 u32 n_left_from, next_index, *from, *to_next;
162 from = vlib_frame_vector_args (frame);
163 n_left_from = frame->n_vectors;
164 next_index = node->cached_next_index;
166 u32 thread_index = vlib_get_thread_index ();
168 while (n_left_from > 0)
172 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
174 /* TODO: Dual/quad loop */
176 while (n_left_from > 0 && n_left_to_next > 0)
180 ip6_header_t *ip0 = 0;
181 ip6_sr_localsid_t *ls0;
182 u32 next0 = SRV6_AS_LOCALSID_NEXT_ERROR;
191 b0 = vlib_get_buffer (vm, bi0);
192 ip0 = vlib_buffer_get_current (b0);
194 /* Lookup the SR End behavior based on IP DA (adj) */
195 ls0 = pool_elt_at_index (sm->localsids,
196 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
199 end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
201 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
203 srv6_as_localsid_trace_t *tr =
204 vlib_add_trace (vm, node, b0, sizeof *tr);
205 tr->localsid_index = ls0 - sm->localsids;
208 /* This increments the SRv6 per LocalSID counters. */
209 vlib_increment_combined_counter (((next0 ==
210 SRV6_AS_LOCALSID_NEXT_ERROR) ?
211 &(sm->sr_ls_invalid_counters) :
212 &(sm->sr_ls_valid_counters)),
213 thread_index, ls0 - sm->localsids,
214 1, vlib_buffer_length_in_chain (vm,
217 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
218 n_left_to_next, bi0, next0);
223 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
226 return frame->n_vectors;
230 VLIB_REGISTER_NODE (srv6_as_localsid_node) = {
231 .function = srv6_as_localsid_fn,
232 .name = "srv6-as-localsid",
233 .vector_size = sizeof (u32),
234 .format_trace = format_srv6_as_localsid_trace,
235 .type = VLIB_NODE_TYPE_INTERNAL,
236 .n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
238 [SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
239 [SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
240 [SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
246 /******************************* Rewriting node *******************************/
249 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
252 srv6_as4_rewrite_fn (vlib_main_t * vm,
253 vlib_node_runtime_t * node, vlib_frame_t * frame)
255 ip6_sr_main_t *srm = &sr_main;
256 srv6_as_main_t *sm = &srv6_as_main;
257 u32 n_left_from, next_index, *from, *to_next;
260 from = vlib_frame_vector_args (frame);
261 n_left_from = frame->n_vectors;
262 next_index = node->cached_next_index;
264 while (n_left_from > 0)
268 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
270 /* TODO: Dual/quad loop */
272 while (n_left_from > 0 && n_left_to_next > 0)
276 ip4_header_t *ip0_encap = 0;
277 ip6_header_t *ip0 = 0;
278 ip6_sr_localsid_t *ls0;
279 srv6_as_localsid_t *ls0_mem;
280 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
290 b0 = vlib_get_buffer (vm, bi0);
291 ip0_encap = vlib_buffer_get_current (b0);
292 ls0 = pool_elt_at_index (srm->localsids,
293 sm->sw_iface_localsid4[vnet_buffer
296 ls0_mem = ls0->plugin_mem;
298 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
300 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
301 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
305 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
306 (vec_len (ls0_mem->rewrite) + b0->current_data));
308 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
309 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
310 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
312 ip0 = vlib_buffer_get_current (b0);
314 /* Update inner IPv4 TTL and checksum */
317 checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
318 checksum0 += checksum0 >= 0xffff;
319 ip0_encap->checksum = checksum0;
321 /* Update outer IPv6 length (in case it has changed) */
322 new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
323 clib_net_to_host_u16 (ip0_encap->length);
324 ip0->payload_length = clib_host_to_net_u16 (new_l0);
327 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
328 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
330 srv6_as_rewrite_trace_t *tr =
331 vlib_add_trace (vm, node, b0, sizeof *tr);
334 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
340 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
341 sizeof tr->src.as_u8);
342 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
343 sizeof tr->dst.as_u8);
347 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
348 n_left_to_next, bi0, next0);
353 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
356 /* Update counters */
357 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
358 SRV6_AS_REWRITE_COUNTER_PROCESSED,
361 return frame->n_vectors;
365 VLIB_REGISTER_NODE (srv6_as4_rewrite_node) = {
366 .function = srv6_as4_rewrite_fn,
367 .name = "srv6-as4-rewrite",
368 .vector_size = sizeof (u32),
369 .format_trace = format_srv6_as_rewrite_trace,
370 .type = VLIB_NODE_TYPE_INTERNAL,
371 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
372 .error_strings = srv6_as_rewrite_counter_strings,
373 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
375 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
376 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
383 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
386 srv6_as6_rewrite_fn (vlib_main_t * vm,
387 vlib_node_runtime_t * node, vlib_frame_t * frame)
389 ip6_sr_main_t *srm = &sr_main;
390 srv6_as_main_t *sm = &srv6_as_main;
391 u32 n_left_from, next_index, *from, *to_next;
394 from = vlib_frame_vector_args (frame);
395 n_left_from = frame->n_vectors;
396 next_index = node->cached_next_index;
398 while (n_left_from > 0)
402 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
404 /* TODO: Dual/quad loop */
406 while (n_left_from > 0 && n_left_to_next > 0)
410 ip6_header_t *ip0 = 0, *ip0_encap = 0;
411 ip6_sr_localsid_t *ls0;
412 srv6_as_localsid_t *ls0_mem;
413 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
423 b0 = vlib_get_buffer (vm, bi0);
424 ip0_encap = vlib_buffer_get_current (b0);
425 ls0 = pool_elt_at_index (srm->localsids,
426 sm->sw_iface_localsid6[vnet_buffer
429 ls0_mem = ls0->plugin_mem;
431 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
433 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
434 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
438 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
439 (vec_len (ls0_mem->rewrite) + b0->current_data));
441 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
442 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
443 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
445 ip0 = vlib_buffer_get_current (b0);
447 /* Update inner IPv6 hop limit */
448 ip0_encap->hop_limit -= 1;
450 /* Update outer IPv6 length (in case it has changed) */
451 new_l0 = vec_len (ls0_mem->rewrite) +
452 clib_net_to_host_u16 (ip0_encap->payload_length);
453 ip0->payload_length = clib_host_to_net_u16 (new_l0);
456 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
457 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
459 srv6_as_rewrite_trace_t *tr =
460 vlib_add_trace (vm, node, b0, sizeof *tr);
463 if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
469 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
470 sizeof tr->src.as_u8);
471 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
472 sizeof tr->dst.as_u8);
476 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
477 n_left_to_next, bi0, next0);
482 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
485 /* Update counters */
486 vlib_node_increment_counter (vm, srv6_as6_rewrite_node.index,
487 SRV6_AS_REWRITE_COUNTER_PROCESSED,
490 return frame->n_vectors;
494 VLIB_REGISTER_NODE (srv6_as6_rewrite_node) = {
495 .function = srv6_as6_rewrite_fn,
496 .name = "srv6-as6-rewrite",
497 .vector_size = sizeof (u32),
498 .format_trace = format_srv6_as_rewrite_trace,
499 .type = VLIB_NODE_TYPE_INTERNAL,
500 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
501 .error_strings = srv6_as_rewrite_counter_strings,
502 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
504 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
505 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
511 * fd.io coding-style-patch-verification: ON
514 * eval: (c-set-style "gnu")