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-am/am.h>
21 /******************************* Packet tracing *******************************/
26 } srv6_am_localsid_trace_t;
30 ip6_address_t src, dst;
31 } srv6_am_rewrite_trace_t;
34 format_srv6_am_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_am_localsid_trace_t *t = va_arg (*args, srv6_am_localsid_trace_t *);
40 return format (s, "SRv6-AM-localsid: localsid_index %d", t->localsid_index);
44 format_srv6_am_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_am_rewrite_trace_t *t = va_arg (*args, srv6_am_rewrite_trace_t *);
50 return format (s, "SRv6-AM-rewrite: src %U dst %U",
51 format_ip6_address, &t->src, format_ip6_address, &t->dst);
55 /***************************** Node registration ******************************/
57 vlib_node_registration_t srv6_am_rewrite_node;
60 /****************************** Packet counters *******************************/
62 #define foreach_srv6_am_rewrite_counter \
63 _(PROCESSED, "srv6-am rewritten packets") \
64 _(NO_SRH, "(Error) No SRH.")
68 #define _(sym,str) SRV6_AM_REWRITE_COUNTER_##sym,
69 foreach_srv6_am_rewrite_counter
71 SRV6_AM_REWRITE_N_COUNTERS,
72 } srv6_am_rewrite_counters;
74 static char *srv6_am_rewrite_counter_strings[] = {
75 #define _(sym,string) string,
76 foreach_srv6_am_rewrite_counter
81 /********************************* Next nodes *********************************/
85 SRV6_AM_LOCALSID_NEXT_ERROR,
86 SRV6_AM_LOCALSID_NEXT_REWRITE,
87 SRV6_AM_LOCALSID_N_NEXT,
88 } srv6_am_localsid_next_t;
92 SRV6_AM_REWRITE_NEXT_ERROR,
93 SRV6_AM_REWRITE_NEXT_LOOKUP,
94 SRV6_AM_REWRITE_N_NEXT,
95 } srv6_am_rewrite_next_t;
98 /******************************* Local SID node *******************************/
101 * @brief SRv6 masquerading.
103 static_always_inline void
104 end_am_processing (vlib_buffer_t * b0,
106 ip6_sr_header_t * sr0,
107 ip6_sr_localsid_t * ls0, u32 * next0)
109 ip6_address_t *new_dst0;
111 if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_IPV6_ROUTE ||
112 sr0->type != ROUTING_HEADER_TYPE_SR))
114 *next0 = SRV6_AM_LOCALSID_NEXT_ERROR;
118 if (PREDICT_FALSE (sr0->segments_left == 0))
120 *next0 = SRV6_AM_LOCALSID_NEXT_ERROR;
124 /* Decrement Segments Left */
125 sr0->segments_left -= 1;
127 /* Set Destination Address to Last Segment (index 0) */
128 new_dst0 = (ip6_address_t *) (sr0->segments);
129 ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
130 ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
132 /* Set Xconnect adjacency to VNF */
133 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj;
137 * @brief Graph node for applying SRv6 masquerading.
140 srv6_am_localsid_fn (vlib_main_t * vm,
141 vlib_node_runtime_t * node, vlib_frame_t * frame)
143 ip6_sr_main_t *sm = &sr_main;
144 u32 n_left_from, next_index, *from, *to_next;
146 from = vlib_frame_vector_args (frame);
147 n_left_from = frame->n_vectors;
148 next_index = node->cached_next_index;
150 u32 thread_index = vm->thread_index;
152 while (n_left_from > 0)
156 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
158 /* TODO: Dual/quad loop */
160 while (n_left_from > 0 && n_left_to_next > 0)
164 ip6_header_t *ip0 = 0;
165 ip6_sr_header_t *sr0;
166 ip6_sr_localsid_t *ls0;
167 u32 next0 = SRV6_AM_LOCALSID_NEXT_REWRITE;
176 b0 = vlib_get_buffer (vm, bi0);
177 ip0 = vlib_buffer_get_current (b0);
178 sr0 = (ip6_sr_header_t *) (ip0 + 1);
180 /* Lookup the SR End behavior based on IP DA (adj) */
181 ls0 = pool_elt_at_index (sm->localsids,
182 vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
185 end_am_processing (b0, ip0, sr0, ls0, &next0);
187 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
189 srv6_am_localsid_trace_t *tr =
190 vlib_add_trace (vm, node, b0, sizeof *tr);
191 tr->localsid_index = ls0 - sm->localsids;
194 /* This increments the SRv6 per LocalSID counters. */
195 vlib_increment_combined_counter (((next0 ==
196 SRV6_AM_LOCALSID_NEXT_ERROR) ?
197 &(sm->sr_ls_invalid_counters) :
198 &(sm->sr_ls_valid_counters)),
199 thread_index, ls0 - sm->localsids,
200 1, vlib_buffer_length_in_chain (vm,
203 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
204 n_left_to_next, bi0, next0);
207 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
210 return frame->n_vectors;
214 VLIB_REGISTER_NODE (srv6_am_localsid_node) = {
215 .function = srv6_am_localsid_fn,
216 .name = "srv6-am-localsid",
217 .vector_size = sizeof (u32),
218 .format_trace = format_srv6_am_localsid_trace,
219 .type = VLIB_NODE_TYPE_INTERNAL,
220 .n_next_nodes = SRV6_AM_LOCALSID_N_NEXT,
222 [SRV6_AM_LOCALSID_NEXT_REWRITE] = "ip6-rewrite",
223 [SRV6_AM_LOCALSID_NEXT_ERROR] = "error-drop",
229 /******************************* Rewriting node *******************************/
232 * @brief SRv6 de-masquerading.
234 static_always_inline void
235 end_am_rewriting (vlib_node_runtime_t * node,
237 ip6_header_t * ip0, ip6_sr_header_t * sr0, u32 * next0)
239 if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_IPV6_ROUTE ||
240 sr0->type != ROUTING_HEADER_TYPE_SR))
242 b0->error = node->errors[SRV6_AM_REWRITE_COUNTER_NO_SRH];
243 *next0 = SRV6_AM_REWRITE_NEXT_ERROR;
247 /* Restore Destination Address to active segment (index SL) */
248 if (sr0->segments_left != 0)
250 ip6_address_t *new_dst0;
251 new_dst0 = (ip6_address_t *) (sr0->segments) + sr0->segments_left;
252 ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
253 ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
258 * @brief Graph node for applying SRv6 de-masquerading.
261 srv6_am_rewrite_fn (vlib_main_t * vm,
262 vlib_node_runtime_t * node, vlib_frame_t * frame)
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 ip6_header_t *ip0 = 0;
284 ip6_sr_header_t *sr0;
285 u32 next0 = SRV6_AM_REWRITE_NEXT_LOOKUP;
294 b0 = vlib_get_buffer (vm, bi0);
295 ip0 = vlib_buffer_get_current (b0);
296 sr0 = (ip6_sr_header_t *) (ip0 + 1);
299 end_am_rewriting (node, b0, ip0, sr0, &next0);
301 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
302 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
304 srv6_am_rewrite_trace_t *tr =
305 vlib_add_trace (vm, node, b0, sizeof *tr);
306 clib_memcpy_fast (tr->src.as_u8, ip0->src_address.as_u8,
307 sizeof tr->src.as_u8);
308 clib_memcpy_fast (tr->dst.as_u8, ip0->dst_address.as_u8,
309 sizeof tr->dst.as_u8);
312 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
313 n_left_to_next, bi0, next0);
318 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
321 /* Update counters */
322 vlib_node_increment_counter (vm, srv6_am_rewrite_node.index,
323 SRV6_AM_REWRITE_COUNTER_PROCESSED,
326 return frame->n_vectors;
330 VLIB_REGISTER_NODE (srv6_am_rewrite_node) = {
331 .function = srv6_am_rewrite_fn,
332 .name = "srv6-am-rewrite",
333 .vector_size = sizeof (u32),
334 .format_trace = format_srv6_am_rewrite_trace,
335 .type = VLIB_NODE_TYPE_INTERNAL,
336 .n_errors = SRV6_AM_REWRITE_N_COUNTERS,
337 .error_strings = srv6_am_rewrite_counter_strings,
338 .n_next_nodes = SRV6_AM_REWRITE_N_NEXT,
340 [SRV6_AM_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
341 [SRV6_AM_REWRITE_NEXT_ERROR] = "error-drop",
347 * fd.io coding-style-patch-verification: ON
350 * eval: (c-set-style "gnu")