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-ad/ad.h>
21 /******************************* Packet tracing *******************************/
26 } srv6_ad_localsid_trace_t;
30 ip6_address_t src, dst;
31 } srv6_ad_rewrite_trace_t;
34 format_srv6_ad_localsid_trace (u8 * s, va_list * args)
36 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38 srv6_ad_localsid_trace_t *t = va_arg (*args, srv6_ad_localsid_trace_t *);
40 return format (s, "SRv6-AD-localsid: localsid_index %d", t->localsid_index);
44 format_srv6_ad_rewrite_trace (u8 * s, va_list * args)
46 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
47 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
48 srv6_ad_rewrite_trace_t *t = va_arg (*args, srv6_ad_rewrite_trace_t *);
50 return format (s, "SRv6-AD-rewrite: src %U dst %U",
51 format_ip6_address, &t->src, format_ip6_address, &t->dst);
55 /***************************** Nodes registration *****************************/
57 vlib_node_registration_t srv6_ad4_rewrite_node;
58 vlib_node_registration_t srv6_ad6_rewrite_node;
61 /****************************** Packet counters *******************************/
63 #define foreach_srv6_ad_rewrite_counter \
64 _(PROCESSED, "srv6-ad rewritten packets") \
65 _(NO_RW, "(Error) No header for rewriting.")
69 #define _(sym,str) SRV6_AD_REWRITE_COUNTER_##sym,
70 foreach_srv6_ad_rewrite_counter
72 SRV6_AD_REWRITE_N_COUNTERS,
73 } srv6_ad_rewrite_counters;
75 static char *srv6_ad_rewrite_counter_strings[] = {
76 #define _(sym,string) string,
77 foreach_srv6_ad_rewrite_counter
82 /********************************* Next nodes *********************************/
86 SRV6_AD_LOCALSID_NEXT_ERROR,
87 SRV6_AD_LOCALSID_NEXT_REWRITE4,
88 SRV6_AD_LOCALSID_NEXT_REWRITE6,
89 SRV6_AD_LOCALSID_N_NEXT,
90 } srv6_ad_localsid_next_t;
94 SRV6_AD_REWRITE_NEXT_ERROR,
95 SRV6_AD_REWRITE_NEXT_LOOKUP,
96 SRV6_AD_REWRITE_N_NEXT,
97 } srv6_ad_rewrite_next_t;
100 /******************************* Local SID node *******************************/
103 * @brief Function doing SRH processing for AD behavior
105 static_always_inline void
106 end_ad_processing (vlib_buffer_t * b0,
108 ip6_sr_header_t * sr0,
109 ip6_sr_localsid_t * ls0, u32 * next0)
111 ip6_address_t *new_dst0;
113 ip6_ext_header_t *next_ext_header;
115 srv6_ad_localsid_t *ls0_mem;
117 if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_IPV6_ROUTE ||
118 sr0->type != ROUTING_HEADER_TYPE_SR))
123 if (PREDICT_FALSE (sr0->segments_left == 0))
128 /* Decrement Segments Left and update Destination Address */
129 sr0->segments_left -= 1;
130 new_dst0 = (ip6_address_t *) (sr0->segments) + sr0->segments_left;
131 ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
132 ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
134 /* Compute the total size of the IPv6 header and extensions */
135 total_size = sizeof (ip6_header_t);
136 next_ext_header = (ip6_ext_header_t *) (ip0 + 1);
137 next_hdr = ip0->protocol;
139 while (ip6_ext_hdr (next_hdr))
141 total_size += ip6_ext_header_len (next_ext_header);
142 next_hdr = next_ext_header->next_hdr;
143 next_ext_header = ip6_ext_next_header (next_ext_header);
146 /* Make sure next header is IP */
148 (next_hdr != IP_PROTOCOL_IPV6 && next_hdr != IP_PROTOCOL_IP_IN_IP))
153 /* Retrieve SID memory */
154 ls0_mem = ls0->plugin_mem;
156 /* Cache IP header and extensions */
157 vec_validate (ls0_mem->rewrite, total_size - 1);
158 clib_memcpy (ls0_mem->rewrite, ip0, total_size);
160 /* Remove IP header and extensions */
161 vlib_buffer_advance (b0, total_size);
163 /* Set Xconnect adjacency to VNF */
164 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
166 if (ls0_mem->ip_version == DA_IP4)
167 *next0 = SRV6_AD_LOCALSID_NEXT_REWRITE4;
168 else if (ls0_mem->ip_version == DA_IP6)
169 *next0 = SRV6_AD_LOCALSID_NEXT_REWRITE6;
173 * @brief SRv6 AD Localsid graph node
176 srv6_ad_localsid_fn (vlib_main_t * vm,
177 vlib_node_runtime_t * node, vlib_frame_t * frame)
179 ip6_sr_main_t *sm = &sr_main;
180 u32 n_left_from, next_index, *from, *to_next;
183 from = vlib_frame_vector_args (frame);
184 n_left_from = frame->n_vectors;
185 next_index = node->cached_next_index;
187 u32 thread_index = vlib_get_thread_index ();
189 while (n_left_from > 0)
193 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
195 /* TODO: Dual/quad loop */
197 while (n_left_from > 0 && n_left_to_next > 0)
201 ip6_header_t *ip0 = 0;
202 ip6_sr_header_t *sr0;
203 ip6_sr_localsid_t *ls0;
204 u32 next0 = SRV6_AD_LOCALSID_NEXT_ERROR;
213 b0 = vlib_get_buffer (vm, bi0);
214 ip0 = vlib_buffer_get_current (b0);
215 sr0 = (ip6_sr_header_t *) (ip0 + 1);
217 /* Lookup the SR End behavior based on IP DA (adj) */
218 ls0 = pool_elt_at_index (sm->localsids,
219 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
222 end_ad_processing (b0, ip0, sr0, ls0, &next0);
224 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
226 srv6_ad_localsid_trace_t *tr =
227 vlib_add_trace (vm, node, b0, sizeof *tr);
228 tr->localsid_index = ls0 - sm->localsids;
231 /* This increments the SRv6 per LocalSID counters. */
232 vlib_increment_combined_counter (((next0 ==
233 SRV6_AD_LOCALSID_NEXT_ERROR) ?
234 &(sm->sr_ls_invalid_counters) :
235 &(sm->sr_ls_valid_counters)),
236 thread_index, ls0 - sm->localsids,
237 1, vlib_buffer_length_in_chain (vm,
240 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
241 n_left_to_next, bi0, next0);
246 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
249 return frame->n_vectors;
253 VLIB_REGISTER_NODE (srv6_ad_localsid_node) = {
254 .function = srv6_ad_localsid_fn,
255 .name = "srv6-ad-localsid",
256 .vector_size = sizeof (u32),
257 .format_trace = format_srv6_ad_localsid_trace,
258 .type = VLIB_NODE_TYPE_INTERNAL,
259 .n_next_nodes = SRV6_AD_LOCALSID_N_NEXT,
261 [SRV6_AD_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
262 [SRV6_AD_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
263 [SRV6_AD_LOCALSID_NEXT_ERROR] = "error-drop",
269 /******************************* Rewriting node *******************************/
272 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
275 srv6_ad4_rewrite_fn (vlib_main_t * vm,
276 vlib_node_runtime_t * node, vlib_frame_t * frame)
278 ip6_sr_main_t *srm = &sr_main;
279 srv6_ad_main_t *sm = &srv6_ad_main;
280 u32 n_left_from, next_index, *from, *to_next;
283 from = vlib_frame_vector_args (frame);
284 n_left_from = frame->n_vectors;
285 next_index = node->cached_next_index;
287 while (n_left_from > 0)
291 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
293 /* TODO: Dual/quad loop */
295 while (n_left_from > 0 && n_left_to_next > 0)
299 ip4_header_t *ip0_encap = 0;
300 ip6_header_t *ip0 = 0;
301 ip6_sr_localsid_t *ls0;
302 srv6_ad_localsid_t *ls0_mem;
303 u32 next0 = SRV6_AD_REWRITE_NEXT_LOOKUP;
313 b0 = vlib_get_buffer (vm, bi0);
314 ip0_encap = vlib_buffer_get_current (b0);
315 ls0 = pool_elt_at_index (srm->localsids,
316 sm->sw_iface_localsid4[vnet_buffer
319 ls0_mem = ls0->plugin_mem;
321 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
323 next0 = SRV6_AD_REWRITE_NEXT_ERROR;
324 b0->error = node->errors[SRV6_AD_REWRITE_COUNTER_NO_RW];
328 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
329 (vec_len (ls0_mem->rewrite) + b0->current_data));
331 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
332 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
333 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
335 ip0 = vlib_buffer_get_current (b0);
337 /* Update inner IPv4 TTL and checksum */
340 checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
341 checksum0 += checksum0 >= 0xffff;
342 ip0_encap->checksum = checksum0;
344 /* Update outer IPv6 length (in case it has changed) */
345 new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
346 clib_net_to_host_u16 (ip0_encap->length);
347 ip0->payload_length = clib_host_to_net_u16 (new_l0);
350 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
351 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
353 srv6_ad_rewrite_trace_t *tr =
354 vlib_add_trace (vm, node, b0, sizeof *tr);
355 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
356 sizeof tr->src.as_u8);
357 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
358 sizeof tr->dst.as_u8);
361 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
362 n_left_to_next, bi0, next0);
367 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
370 /* Update counters */
371 vlib_node_increment_counter (vm, srv6_ad4_rewrite_node.index,
372 SRV6_AD_REWRITE_COUNTER_PROCESSED,
375 return frame->n_vectors;
379 VLIB_REGISTER_NODE (srv6_ad4_rewrite_node) = {
380 .function = srv6_ad4_rewrite_fn,
381 .name = "srv6-ad4-rewrite",
382 .vector_size = sizeof (u32),
383 .format_trace = format_srv6_ad_rewrite_trace,
384 .type = VLIB_NODE_TYPE_INTERNAL,
385 .n_errors = SRV6_AD_REWRITE_N_COUNTERS,
386 .error_strings = srv6_ad_rewrite_counter_strings,
387 .n_next_nodes = SRV6_AD_REWRITE_N_NEXT,
389 [SRV6_AD_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
390 [SRV6_AD_REWRITE_NEXT_ERROR] = "error-drop",
397 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
400 srv6_ad6_rewrite_fn (vlib_main_t * vm,
401 vlib_node_runtime_t * node, vlib_frame_t * frame)
403 ip6_sr_main_t *srm = &sr_main;
404 srv6_ad_main_t *sm = &srv6_ad_main;
405 u32 n_left_from, next_index, *from, *to_next;
408 from = vlib_frame_vector_args (frame);
409 n_left_from = frame->n_vectors;
410 next_index = node->cached_next_index;
412 while (n_left_from > 0)
416 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
418 /* TODO: Dual/quad loop */
420 while (n_left_from > 0 && n_left_to_next > 0)
424 ip6_header_t *ip0 = 0, *ip0_encap = 0;
425 ip6_sr_localsid_t *ls0;
426 srv6_ad_localsid_t *ls0_mem;
427 u32 next0 = SRV6_AD_REWRITE_NEXT_LOOKUP;
437 b0 = vlib_get_buffer (vm, bi0);
438 ip0_encap = vlib_buffer_get_current (b0);
439 ls0 = pool_elt_at_index (srm->localsids,
440 sm->sw_iface_localsid6[vnet_buffer
443 ls0_mem = ls0->plugin_mem;
445 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
447 next0 = SRV6_AD_REWRITE_NEXT_ERROR;
448 b0->error = node->errors[SRV6_AD_REWRITE_COUNTER_NO_RW];
452 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
453 (vec_len (ls0_mem->rewrite) + b0->current_data));
455 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
456 ls0_mem->rewrite, 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 IPv6 hop limit */
462 ip0_encap->hop_limit -= 1;
464 /* Update outer IPv6 length (in case it has changed) */
465 new_l0 = vec_len (ls0_mem->rewrite) +
466 clib_net_to_host_u16 (ip0_encap->payload_length);
467 ip0->payload_length = clib_host_to_net_u16 (new_l0);
470 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
471 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
473 srv6_ad_rewrite_trace_t *tr =
474 vlib_add_trace (vm, node, b0, sizeof *tr);
475 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
476 sizeof tr->src.as_u8);
477 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
478 sizeof tr->dst.as_u8);
481 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
482 n_left_to_next, bi0, next0);
487 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
490 /* Update counters */
491 vlib_node_increment_counter (vm, srv6_ad6_rewrite_node.index,
492 SRV6_AD_REWRITE_COUNTER_PROCESSED,
495 return frame->n_vectors;
499 VLIB_REGISTER_NODE (srv6_ad6_rewrite_node) = {
500 .function = srv6_ad6_rewrite_fn,
501 .name = "srv6-ad6-rewrite",
502 .vector_size = sizeof (u32),
503 .format_trace = format_srv6_ad_rewrite_trace,
504 .type = VLIB_NODE_TYPE_INTERNAL,
505 .n_errors = SRV6_AD_REWRITE_N_COUNTERS,
506 .error_strings = srv6_ad_rewrite_counter_strings,
507 .n_next_nodes = SRV6_AD_REWRITE_N_NEXT,
509 [SRV6_AD_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
510 [SRV6_AD_REWRITE_NEXT_ERROR] = "error-drop",
516 * fd.io coding-style-patch-verification: ON
519 * eval: (c-set-style "gnu")