2 * Copyright (c) 2016 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.
16 * ip/ip6_forward.h: IP v6 forwarding
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef __included_ip6_forward_h__
41 #define __included_ip6_forward_h__
43 #include <vnet/fib/ip6_fib.h>
44 #include <vnet/dpo/load_balance_map.h>
48 * @brief IPv6 Forwarding.
50 * This file contains the source code for IPv6 forwarding.
55 ip6_lookup_inline (vlib_main_t * vm,
56 vlib_node_runtime_t * node, vlib_frame_t * frame)
58 ip6_main_t *im = &ip6_main;
59 vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
60 u32 n_left_from, n_left_to_next, *from, *to_next;
61 ip_lookup_next_t next;
62 u32 thread_index = vm->thread_index;
64 from = vlib_frame_vector_args (frame);
65 n_left_from = frame->n_vectors;
66 next = node->cached_next_index;
68 while (n_left_from > 0)
70 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
72 while (n_left_from >= 4 && n_left_to_next >= 2)
74 vlib_buffer_t *p0, *p1;
75 u32 pi0, pi1, lbi0, lbi1, wrong_next;
76 ip_lookup_next_t next0, next1;
77 ip6_header_t *ip0, *ip1;
78 ip6_address_t *dst_addr0, *dst_addr1;
79 u32 flow_hash_config0, flow_hash_config1;
80 const dpo_id_t *dpo0, *dpo1;
81 const load_balance_t *lb0, *lb1;
83 /* Prefetch next iteration. */
85 vlib_buffer_t *p2, *p3;
87 p2 = vlib_get_buffer (vm, from[2]);
88 p3 = vlib_get_buffer (vm, from[3]);
90 vlib_prefetch_buffer_header (p2, LOAD);
91 vlib_prefetch_buffer_header (p3, LOAD);
92 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
93 CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
96 pi0 = to_next[0] = from[0];
97 pi1 = to_next[1] = from[1];
99 p0 = vlib_get_buffer (vm, pi0);
100 p1 = vlib_get_buffer (vm, pi1);
102 ip0 = vlib_buffer_get_current (p0);
103 ip1 = vlib_buffer_get_current (p1);
105 dst_addr0 = &ip0->dst_address;
106 dst_addr1 = &ip1->dst_address;
108 ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
109 ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p1);
111 lbi0 = ip6_fib_table_fwding_lookup (im,
112 vnet_buffer (p0)->ip.fib_index,
114 lbi1 = ip6_fib_table_fwding_lookup (im,
115 vnet_buffer (p1)->ip.fib_index,
118 lb0 = load_balance_get (lbi0);
119 lb1 = load_balance_get (lbi1);
120 ASSERT (lb0->lb_n_buckets > 0);
121 ASSERT (lb1->lb_n_buckets > 0);
122 ASSERT (is_pow2 (lb0->lb_n_buckets));
123 ASSERT (is_pow2 (lb1->lb_n_buckets));
125 vnet_buffer (p0)->ip.flow_hash = vnet_buffer (p1)->ip.flow_hash = 0;
127 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
129 flow_hash_config0 = lb0->lb_hash_config;
130 vnet_buffer (p0)->ip.flow_hash =
131 ip6_compute_flow_hash (ip0, flow_hash_config0);
133 load_balance_get_fwd_bucket (lb0,
134 (vnet_buffer (p0)->ip.flow_hash &
135 (lb0->lb_n_buckets_minus_1)));
139 dpo0 = load_balance_get_bucket_i (lb0, 0);
141 if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
143 flow_hash_config1 = lb1->lb_hash_config;
144 vnet_buffer (p1)->ip.flow_hash =
145 ip6_compute_flow_hash (ip1, flow_hash_config1);
147 load_balance_get_fwd_bucket (lb1,
148 (vnet_buffer (p1)->ip.flow_hash &
149 (lb1->lb_n_buckets_minus_1)));
153 dpo1 = load_balance_get_bucket_i (lb1, 0);
155 next0 = dpo0->dpoi_next_node;
156 next1 = dpo1->dpoi_next_node;
158 /* Only process the HBH Option Header if explicitly configured to do so */
160 (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
162 next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
163 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
166 (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
168 next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
169 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
171 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
172 vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
174 vlib_increment_combined_counter
175 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
176 vlib_increment_combined_counter
177 (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
184 wrong_next = (next0 != next) + 2 * (next1 != next);
185 if (PREDICT_FALSE (wrong_next != 0))
194 vlib_set_next_frame_buffer (vm, node, next0, pi0);
201 vlib_set_next_frame_buffer (vm, node, next1, pi1);
208 vlib_set_next_frame_buffer (vm, node, next0, pi0);
209 vlib_set_next_frame_buffer (vm, node, next1, pi1);
213 vlib_put_next_frame (vm, node, next, n_left_to_next);
215 vlib_get_next_frame (vm, node, next, to_next,
222 while (n_left_from > 0 && n_left_to_next > 0)
227 ip_lookup_next_t next0;
229 ip6_address_t *dst_addr0;
230 u32 flow_hash_config0;
231 const dpo_id_t *dpo0;
236 p0 = vlib_get_buffer (vm, pi0);
237 ip0 = vlib_buffer_get_current (p0);
238 dst_addr0 = &ip0->dst_address;
239 ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
240 lbi0 = ip6_fib_table_fwding_lookup (im,
241 vnet_buffer (p0)->ip.fib_index,
244 lb0 = load_balance_get (lbi0);
245 flow_hash_config0 = lb0->lb_hash_config;
247 vnet_buffer (p0)->ip.flow_hash = 0;
248 ASSERT (lb0->lb_n_buckets > 0);
249 ASSERT (is_pow2 (lb0->lb_n_buckets));
251 if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
253 flow_hash_config0 = lb0->lb_hash_config;
254 vnet_buffer (p0)->ip.flow_hash =
255 ip6_compute_flow_hash (ip0, flow_hash_config0);
257 load_balance_get_fwd_bucket (lb0,
258 (vnet_buffer (p0)->ip.flow_hash &
259 (lb0->lb_n_buckets_minus_1)));
263 dpo0 = load_balance_get_bucket_i (lb0, 0);
266 dpo0 = load_balance_get_bucket_i (lb0,
267 (vnet_buffer (p0)->ip.flow_hash &
268 lb0->lb_n_buckets_minus_1));
269 next0 = dpo0->dpoi_next_node;
271 /* Only process the HBH Option Header if explicitly configured to do so */
273 (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
275 next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
276 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
278 vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
280 vlib_increment_combined_counter
281 (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
288 if (PREDICT_FALSE (next0 != next))
291 vlib_put_next_frame (vm, node, next, n_left_to_next);
293 vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
300 vlib_put_next_frame (vm, node, next, n_left_to_next);
303 if (node->flags & VLIB_NODE_FLAG_TRACE)
304 ip6_forward_next_trace (vm, node, frame, VLIB_TX);
306 return frame->n_vectors;
309 #endif /*__included_ip6_forward_h__ */
312 * fd.io coding-style-patch-verification: ON
315 * eval: (c-set-style "gnu")