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 <vnet/pg/pg.h>
18 #include <vppinfra/error.h>
19 #include <srv6-localsid/srv6_localsid_sample.h>
23 } srv6_localsid_sample_trace_t;
25 /* packet trace format function */
26 static u8 * format_srv6_localsid_sample_trace (u8 * s, va_list * args)
28 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
29 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
30 srv6_localsid_sample_trace_t * t = va_arg (*args, srv6_localsid_sample_trace_t *);
31 s = format (s, "SRv6-sample-localsid: localsid_index %d\n",
36 vlib_node_registration_t srv6_localsid_sample_node;
38 #define foreach_srv6_localsid_counter \
39 _(PROCESSED, "srv6-sample-localsid processed packets") \
40 _(NO_SRH, "(Error) No SRH.")
43 #define _(sym,str) SRV6_LOCALSID_COUNTER_##sym,
44 foreach_srv6_localsid_counter
46 SRV6_LOCALSID_N_COUNTERS,
47 } srv6_localsid_sample_counters;
49 static char * srv6_localsid_counter_strings[] = {
50 #define _(sym,string) string,
51 foreach_srv6_localsid_counter
56 SRV6_SAMPLE_LOCALSID_NEXT_ERROR,
57 SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP,
58 SRV6_SAMPLE_LOCALSID_N_NEXT,
59 } srv6_localsid_sample_next_t;
62 * @brief Function doing End processing.
64 static_always_inline void
65 end_srh_processing (vlib_node_runtime_t * node,
68 ip6_sr_header_t * sr0,
69 ip6_sr_localsid_t * ls0,
72 ip6_ext_header_t * prev0)
74 ip6_address_t *new_dst0;
76 if (PREDICT_TRUE (sr0->type == ROUTING_HEADER_TYPE_SR))
78 if (sr0->segments_left == 1 && psp)
81 u64 *copy_dst0, *copy_src0;
82 u32 copy_len_u64s0 = 0;
84 ip0->dst_address.as_u64[0] = sr0->segments->as_u64[0];
85 ip0->dst_address.as_u64[1] = sr0->segments->as_u64[1];
87 /* Remove the SRH taking care of the rest of IPv6 ext header */
89 prev0->next_hdr = sr0->protocol;
91 ip0->protocol = sr0->protocol;
93 sr_len = ip6_ext_header_len (sr0);
94 vlib_buffer_advance (b0, sr_len);
95 new_l0 = clib_net_to_host_u16 (ip0->payload_length) - sr_len;
96 ip0->payload_length = clib_host_to_net_u16 (new_l0);
97 copy_src0 = (u64 *) ip0;
98 copy_dst0 = copy_src0 + (sr0->length + 1);
99 /* number of 8 octet units to copy
100 * By default in absence of extension headers it is equal to length of ip6 header
101 * With extension headers it number of 8 octet units of ext headers preceding
105 (((u8 *) sr0 - (u8 *) ip0) - sizeof (ip6_header_t)) >> 3;
106 copy_dst0[4 + copy_len_u64s0] = copy_src0[4 + copy_len_u64s0];
107 copy_dst0[3 + copy_len_u64s0] = copy_src0[3 + copy_len_u64s0];
108 copy_dst0[2 + copy_len_u64s0] = copy_src0[2 + copy_len_u64s0];
109 copy_dst0[1 + copy_len_u64s0] = copy_src0[1 + copy_len_u64s0];
110 copy_dst0[0 + copy_len_u64s0] = copy_src0[0 + copy_len_u64s0];
113 for (i = copy_len_u64s0 - 1; i >= 0; i--)
115 copy_dst0[i] = copy_src0[i];
118 if (ls0->behavior == SR_BEHAVIOR_X)
120 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj;
121 *next0 = SR_LOCALSID_NEXT_IP6_REWRITE;
123 else if(ls0->behavior == SR_BEHAVIOR_T)
125 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index;
128 else if (PREDICT_TRUE(sr0->segments_left > 0))
130 sr0->segments_left -= 1;
131 new_dst0 = (ip6_address_t *) (sr0->segments);
132 new_dst0 += sr0->segments_left;
133 ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
134 ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
136 if (ls0->behavior == SR_BEHAVIOR_X)
138 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0->nh_adj;
139 *next0 = SR_LOCALSID_NEXT_IP6_REWRITE;
141 else if(ls0->behavior == SR_BEHAVIOR_T)
143 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ls0->vrf_index;
148 *next0 = SR_LOCALSID_NEXT_ERROR;
149 b0->error = node->errors[SR_LOCALSID_ERROR_NO_MORE_SEGMENTS];
154 /* Error. Routing header of type != SR */
155 *next0 = SR_LOCALSID_NEXT_ERROR;
156 b0->error = node->errors[SR_LOCALSID_ERROR_NO_SRH];
161 * @brief SRv6 Sample Localsid graph node
162 * WARNING: YOU MUST DO THE DUAL LOOP
165 srv6_localsid_sample_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
167 u32 n_left_from, * from, * to_next;
169 u32 pkts_swapped = 0;
171 ip6_sr_main_t * sm = &sr_main;
173 from = vlib_frame_vector_args (frame);
174 n_left_from = frame->n_vectors;
175 next_index = node->cached_next_index;
176 u32 thread_index = vlib_get_thread_index ();
178 while (n_left_from > 0)
182 vlib_get_next_frame (vm, node, next_index,
183 to_next, n_left_to_next);
185 while (n_left_from > 0 && n_left_to_next > 0)
189 ip6_header_t * ip0 = 0;
190 ip6_sr_header_t * sr0;
191 u32 next0 = SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP;
192 ip6_sr_localsid_t *ls0;
193 srv6_localsid_sample_per_sid_memory_t *ls0_mem;
202 b0 = vlib_get_buffer (vm, bi0);
203 ip0 = vlib_buffer_get_current (b0);
204 sr0 = (ip6_sr_header_t *)(ip0+1);
206 /* Lookup the SR End behavior based on IP DA (adj) */
207 ls0 = pool_elt_at_index (sm->localsids, vnet_buffer(b0)->ip.adj_index[VLIB_TX]);
208 ls0_mem = ls0->plugin_mem;
211 sr0 = ip6_ext_header_find (vm, b0, ip0, IP_PROTOCOL_IPV6_ROUTE, NULL);
212 end_decaps_srh_processing (node, b0, ip0, sr0, ls0, &next0);
214 /* ==================================================================== */
215 /* INSERT CODE HERE */
216 /* Example starts here */
217 //In this example we are changing the next VRF table by the one in CLI
218 vnet_buffer(b0)->sw_if_index[VLIB_TX] = ls0_mem->fib_table;
219 /* Example finishes here */
220 /* ==================================================================== */
222 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
224 srv6_localsid_sample_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
225 tr->localsid_index = ls0 - sm->localsids;
228 /* This increments the SRv6 per LocalSID counters.*/
229 vlib_increment_combined_counter
230 (((next0 == SRV6_SAMPLE_LOCALSID_NEXT_ERROR) ? &(sm->sr_ls_invalid_counters) : &(sm->sr_ls_valid_counters)),
233 1, vlib_buffer_length_in_chain (vm, b0));
235 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
236 n_left_to_next, bi0, next0);
240 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
244 return frame->n_vectors;
247 VLIB_REGISTER_NODE (srv6_localsid_sample_node) = {
248 .function = srv6_localsid_sample_fn,
249 .name = "srv6-localsid-sample",
250 .vector_size = sizeof (u32),
251 .format_trace = format_srv6_localsid_sample_trace,
252 .type = VLIB_NODE_TYPE_INTERNAL,
253 .n_errors = SRV6_LOCALSID_N_COUNTERS,
254 .error_strings = srv6_localsid_counter_strings,
255 .n_next_nodes = SRV6_SAMPLE_LOCALSID_N_NEXT,
257 [SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup",
258 [SRV6_SAMPLE_LOCALSID_NEXT_ERROR] = "error-drop",