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;
30 ip6_address_t src, dst;
31 } srv6_as_rewrite_trace_t;
34 format_srv6_as_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_as_localsid_trace_t *t = va_arg (*args, srv6_as_localsid_trace_t *);
40 return format (s, "SRv6-AS-localsid: localsid_index %d", t->localsid_index);
44 format_srv6_as_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_as_rewrite_trace_t *t = va_arg (*args, srv6_as_rewrite_trace_t *);
50 return format (s, "SRv6-AS-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_as4_rewrite_node;
58 vlib_node_registration_t srv6_as6_rewrite_node;
61 /****************************** Packet counters *******************************/
63 #define foreach_srv6_as_rewrite_counter \
64 _(PROCESSED, "srv6-as rewritten packets") \
65 _(NO_RW, "(Error) No header for rewriting.")
69 #define _(sym,str) SRV6_AS_REWRITE_COUNTER_##sym,
70 foreach_srv6_as_rewrite_counter
72 SRV6_AS_REWRITE_N_COUNTERS,
73 } srv6_as_rewrite_counters;
75 static char *srv6_as_rewrite_counter_strings[] = {
76 #define _(sym,string) string,
77 foreach_srv6_as_rewrite_counter
82 /********************************* Next nodes *********************************/
86 SRV6_AS_LOCALSID_NEXT_ERROR,
87 SRV6_AS_LOCALSID_NEXT_REWRITE4,
88 SRV6_AS_LOCALSID_NEXT_REWRITE6,
89 SRV6_AS_LOCALSID_N_NEXT,
90 } srv6_as_localsid_next_t;
94 SRV6_AS_REWRITE_NEXT_ERROR,
95 SRV6_AS_REWRITE_NEXT_LOOKUP,
96 SRV6_AS_REWRITE_N_NEXT,
97 } srv6_as_rewrite_next_t;
100 /******************************* Local SID node *******************************/
103 * @brief Function doing SRH processing for AS behavior
105 static_always_inline void
106 end_as_processing (vlib_buffer_t * b0,
108 srv6_as_localsid_t * ls0_mem, u32 * next0)
111 ip6_ext_header_t *ext_hdr;
114 /* Compute encapsulation headers length */
115 encap_len = sizeof (ip6_header_t);
116 ext_hdr = (ip6_ext_header_t *) (ip0 + 1);
117 hdr_type = ip0->protocol;
119 while (ip6_ext_hdr (hdr_type))
121 encap_len += ip6_ext_header_len (ext_hdr);
122 hdr_type = ext_hdr->next_hdr;
123 ext_hdr = ip6_ext_next_header (ext_hdr);
126 /* Make sure next header is IP */
127 if (PREDICT_FALSE (hdr_type != IP_PROTOCOL_IPV6 &&
128 hdr_type != IP_PROTOCOL_IP_IN_IP))
133 /* Remove IP header and extensions */
134 vlib_buffer_advance (b0, encap_len);
136 /* Set Xconnect adjacency to VNF */
137 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
139 if (ls0_mem->ip_version == DA_IP4)
140 *next0 = SRV6_AS_LOCALSID_NEXT_REWRITE4;
141 else if (ls0_mem->ip_version == DA_IP6)
142 *next0 = SRV6_AS_LOCALSID_NEXT_REWRITE6;
146 * @brief SRv6 AS Localsid graph node
149 srv6_as_localsid_fn (vlib_main_t * vm,
150 vlib_node_runtime_t * node, vlib_frame_t * frame)
152 ip6_sr_main_t *sm = &sr_main;
153 u32 n_left_from, next_index, *from, *to_next;
156 from = vlib_frame_vector_args (frame);
157 n_left_from = frame->n_vectors;
158 next_index = node->cached_next_index;
160 u32 thread_index = vlib_get_thread_index ();
162 while (n_left_from > 0)
166 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
168 /* TODO: Dual/quad loop */
170 while (n_left_from > 0 && n_left_to_next > 0)
174 ip6_header_t *ip0 = 0;
175 ip6_sr_localsid_t *ls0;
176 u32 next0 = SRV6_AS_LOCALSID_NEXT_ERROR;
185 b0 = vlib_get_buffer (vm, bi0);
186 ip0 = vlib_buffer_get_current (b0);
188 /* Lookup the SR End behavior based on IP DA (adj) */
189 ls0 = pool_elt_at_index (sm->localsids,
190 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
193 end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
195 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
197 srv6_as_localsid_trace_t *tr =
198 vlib_add_trace (vm, node, b0, sizeof *tr);
199 tr->localsid_index = ls0 - sm->localsids;
202 /* This increments the SRv6 per LocalSID counters. */
203 vlib_increment_combined_counter (((next0 ==
204 SRV6_AS_LOCALSID_NEXT_ERROR) ?
205 &(sm->sr_ls_invalid_counters) :
206 &(sm->sr_ls_valid_counters)),
207 thread_index, ls0 - sm->localsids,
208 1, vlib_buffer_length_in_chain (vm,
211 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
212 n_left_to_next, bi0, next0);
217 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
220 return frame->n_vectors;
224 VLIB_REGISTER_NODE (srv6_as_localsid_node) = {
225 .function = srv6_as_localsid_fn,
226 .name = "srv6-as-localsid",
227 .vector_size = sizeof (u32),
228 .format_trace = format_srv6_as_localsid_trace,
229 .type = VLIB_NODE_TYPE_INTERNAL,
230 .n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
232 [SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
233 [SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
234 [SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
240 /******************************* Rewriting node *******************************/
243 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
246 srv6_as4_rewrite_fn (vlib_main_t * vm,
247 vlib_node_runtime_t * node, vlib_frame_t * frame)
249 ip6_sr_main_t *srm = &sr_main;
250 srv6_as_main_t *sm = &srv6_as_main;
251 u32 n_left_from, next_index, *from, *to_next;
254 from = vlib_frame_vector_args (frame);
255 n_left_from = frame->n_vectors;
256 next_index = node->cached_next_index;
258 while (n_left_from > 0)
262 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
264 /* TODO: Dual/quad loop */
266 while (n_left_from > 0 && n_left_to_next > 0)
270 ip4_header_t *ip0_encap = 0;
271 ip6_header_t *ip0 = 0;
272 ip6_sr_localsid_t *ls0;
273 srv6_as_localsid_t *ls0_mem;
274 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
284 b0 = vlib_get_buffer (vm, bi0);
285 ip0_encap = vlib_buffer_get_current (b0);
286 ls0 = pool_elt_at_index (srm->localsids,
287 sm->sw_iface_localsid4[vnet_buffer
290 ls0_mem = ls0->plugin_mem;
292 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
294 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
295 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
299 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
300 (vec_len (ls0_mem->rewrite) + b0->current_data));
302 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
303 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
304 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
306 ip0 = vlib_buffer_get_current (b0);
308 /* Update inner IPv4 TTL and checksum */
311 checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
312 checksum0 += checksum0 >= 0xffff;
313 ip0_encap->checksum = checksum0;
315 /* Update outer IPv6 length (in case it has changed) */
316 new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
317 clib_net_to_host_u16 (ip0_encap->length);
318 ip0->payload_length = clib_host_to_net_u16 (new_l0);
321 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
322 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
324 srv6_as_rewrite_trace_t *tr =
325 vlib_add_trace (vm, node, b0, sizeof *tr);
326 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
327 sizeof tr->src.as_u8);
328 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
329 sizeof tr->dst.as_u8);
332 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
333 n_left_to_next, bi0, next0);
338 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
341 /* Update counters */
342 vlib_node_increment_counter (vm, srv6_as4_rewrite_node.index,
343 SRV6_AS_REWRITE_COUNTER_PROCESSED,
346 return frame->n_vectors;
350 VLIB_REGISTER_NODE (srv6_as4_rewrite_node) = {
351 .function = srv6_as4_rewrite_fn,
352 .name = "srv6-as4-rewrite",
353 .vector_size = sizeof (u32),
354 .format_trace = format_srv6_as_rewrite_trace,
355 .type = VLIB_NODE_TYPE_INTERNAL,
356 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
357 .error_strings = srv6_as_rewrite_counter_strings,
358 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
360 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
361 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
368 * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
371 srv6_as6_rewrite_fn (vlib_main_t * vm,
372 vlib_node_runtime_t * node, vlib_frame_t * frame)
374 ip6_sr_main_t *srm = &sr_main;
375 srv6_as_main_t *sm = &srv6_as_main;
376 u32 n_left_from, next_index, *from, *to_next;
379 from = vlib_frame_vector_args (frame);
380 n_left_from = frame->n_vectors;
381 next_index = node->cached_next_index;
383 while (n_left_from > 0)
387 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
389 /* TODO: Dual/quad loop */
391 while (n_left_from > 0 && n_left_to_next > 0)
395 ip6_header_t *ip0 = 0, *ip0_encap = 0;
396 ip6_sr_localsid_t *ls0;
397 srv6_as_localsid_t *ls0_mem;
398 u32 next0 = SRV6_AS_REWRITE_NEXT_LOOKUP;
408 b0 = vlib_get_buffer (vm, bi0);
409 ip0_encap = vlib_buffer_get_current (b0);
410 ls0 = pool_elt_at_index (srm->localsids,
411 sm->sw_iface_localsid6[vnet_buffer
414 ls0_mem = ls0->plugin_mem;
416 if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
418 next0 = SRV6_AS_REWRITE_NEXT_ERROR;
419 b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
423 ASSERT (VLIB_BUFFER_PRE_DATA_SIZE >=
424 (vec_len (ls0_mem->rewrite) + b0->current_data));
426 clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
427 ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
428 vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
430 ip0 = vlib_buffer_get_current (b0);
432 /* Update inner IPv6 hop limit */
433 ip0_encap->hop_limit -= 1;
435 /* Update outer IPv6 length (in case it has changed) */
436 new_l0 = vec_len (ls0_mem->rewrite) +
437 clib_net_to_host_u16 (ip0_encap->payload_length);
438 ip0->payload_length = clib_host_to_net_u16 (new_l0);
441 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
442 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
444 srv6_as_rewrite_trace_t *tr =
445 vlib_add_trace (vm, node, b0, sizeof *tr);
446 clib_memcpy (tr->src.as_u8, ip0->src_address.as_u8,
447 sizeof tr->src.as_u8);
448 clib_memcpy (tr->dst.as_u8, ip0->dst_address.as_u8,
449 sizeof tr->dst.as_u8);
452 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
453 n_left_to_next, bi0, next0);
458 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
461 /* Update counters */
462 vlib_node_increment_counter (vm, srv6_as6_rewrite_node.index,
463 SRV6_AS_REWRITE_COUNTER_PROCESSED,
466 return frame->n_vectors;
470 VLIB_REGISTER_NODE (srv6_as6_rewrite_node) = {
471 .function = srv6_as6_rewrite_fn,
472 .name = "srv6-as6-rewrite",
473 .vector_size = sizeof (u32),
474 .format_trace = format_srv6_as_rewrite_trace,
475 .type = VLIB_NODE_TYPE_INTERNAL,
476 .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
477 .error_strings = srv6_as_rewrite_counter_strings,
478 .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
480 [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
481 [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
487 * fd.io coding-style-patch-verification: ON
490 * eval: (c-set-style "gnu")