Line data Source code
1 : /*
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:
6 : *
7 : * http://www.apache.org/licenses/LICENSE-2.0
8 : *
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.
14 : */
15 : /*
16 : * ip/ip6_forward.h: IP v6 forwarding
17 : *
18 : * Copyright (c) 2008 Eliot Dresselhaus
19 : *
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:
27 : *
28 : * The above copyright notice and this permission notice shall be
29 : * included in all copies or substantial portions of the Software.
30 : *
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.
38 : */
39 :
40 : #ifndef __included_ip6_forward_h__
41 : #define __included_ip6_forward_h__
42 :
43 : #include <vnet/fib/ip6_fib.h>
44 : #include <vnet/dpo/load_balance_map.h>
45 : #include <vnet/ip/ip6_inlines.h>
46 :
47 : /**
48 : * @file
49 : * @brief IPv6 Forwarding.
50 : *
51 : * This file contains the source code for IPv6 forwarding.
52 : */
53 :
54 :
55 : always_inline uword
56 229702 : ip6_lookup_inline (vlib_main_t * vm,
57 : vlib_node_runtime_t * node, vlib_frame_t * frame)
58 : {
59 229702 : ip6_main_t *im = &ip6_main;
60 229702 : vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;
61 : u32 n_left_from, n_left_to_next, *from, *to_next;
62 : ip_lookup_next_t next;
63 229702 : u32 thread_index = vm->thread_index;
64 :
65 229702 : from = vlib_frame_vector_args (frame);
66 229702 : n_left_from = frame->n_vectors;
67 229702 : next = node->cached_next_index;
68 :
69 459404 : while (n_left_from > 0)
70 : {
71 229702 : vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
72 :
73 4972640 : while (n_left_from >= 4 && n_left_to_next >= 2)
74 : {
75 : vlib_buffer_t *p0, *p1;
76 : u32 pi0, pi1, lbi0, lbi1, wrong_next;
77 : ip_lookup_next_t next0, next1;
78 : ip6_header_t *ip0, *ip1;
79 : ip6_address_t *dst_addr0, *dst_addr1;
80 : u32 flow_hash_config0, flow_hash_config1;
81 : const dpo_id_t *dpo0, *dpo1;
82 : const load_balance_t *lb0, *lb1;
83 :
84 : /* Prefetch next iteration. */
85 : {
86 : vlib_buffer_t *p2, *p3;
87 :
88 4742940 : p2 = vlib_get_buffer (vm, from[2]);
89 4742940 : p3 = vlib_get_buffer (vm, from[3]);
90 :
91 4742940 : vlib_prefetch_buffer_header (p2, LOAD);
92 4742940 : vlib_prefetch_buffer_header (p3, LOAD);
93 4742940 : CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
94 4742940 : CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
95 : }
96 :
97 4742940 : pi0 = to_next[0] = from[0];
98 4742940 : pi1 = to_next[1] = from[1];
99 :
100 4742940 : p0 = vlib_get_buffer (vm, pi0);
101 4742940 : p1 = vlib_get_buffer (vm, pi1);
102 :
103 4742940 : ip0 = vlib_buffer_get_current (p0);
104 4742940 : ip1 = vlib_buffer_get_current (p1);
105 :
106 4742940 : dst_addr0 = &ip0->dst_address;
107 4742940 : dst_addr1 = &ip1->dst_address;
108 :
109 4742940 : ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
110 4742940 : ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p1);
111 :
112 4742940 : lbi0 = ip6_fib_table_fwding_lookup (vnet_buffer (p0)->ip.fib_index,
113 : dst_addr0);
114 4742940 : lbi1 = ip6_fib_table_fwding_lookup (vnet_buffer (p1)->ip.fib_index,
115 : dst_addr1);
116 :
117 4742940 : lb0 = load_balance_get (lbi0);
118 4742940 : lb1 = load_balance_get (lbi1);
119 4742940 : ASSERT (lb0->lb_n_buckets > 0);
120 4742940 : ASSERT (lb1->lb_n_buckets > 0);
121 4742940 : ASSERT (is_pow2 (lb0->lb_n_buckets));
122 4742940 : ASSERT (is_pow2 (lb1->lb_n_buckets));
123 :
124 4742940 : vnet_buffer (p0)->ip.flow_hash = vnet_buffer (p1)->ip.flow_hash = 0;
125 :
126 4742940 : if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
127 : {
128 562 : flow_hash_config0 = lb0->lb_hash_config;
129 1124 : vnet_buffer (p0)->ip.flow_hash =
130 562 : ip6_compute_flow_hash (ip0, flow_hash_config0);
131 : dpo0 =
132 562 : load_balance_get_fwd_bucket (lb0,
133 562 : (vnet_buffer (p0)->ip.flow_hash &
134 562 : (lb0->lb_n_buckets_minus_1)));
135 : }
136 : else
137 : {
138 4742370 : dpo0 = load_balance_get_bucket_i (lb0, 0);
139 : }
140 4742940 : if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
141 : {
142 562 : flow_hash_config1 = lb1->lb_hash_config;
143 1124 : vnet_buffer (p1)->ip.flow_hash =
144 562 : ip6_compute_flow_hash (ip1, flow_hash_config1);
145 : dpo1 =
146 562 : load_balance_get_fwd_bucket (lb1,
147 562 : (vnet_buffer (p1)->ip.flow_hash &
148 562 : (lb1->lb_n_buckets_minus_1)));
149 : }
150 : else
151 : {
152 4742370 : dpo1 = load_balance_get_bucket_i (lb1, 0);
153 : }
154 4742940 : next0 = dpo0->dpoi_next_node;
155 4742940 : next1 = dpo1->dpoi_next_node;
156 :
157 : /* Only process the HBH Option Header if explicitly configured to do so */
158 4742940 : if (PREDICT_FALSE
159 : (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
160 : {
161 0 : next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
162 0 : (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
163 : }
164 4742940 : if (PREDICT_FALSE
165 : (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
166 : {
167 0 : next1 = (dpo_is_adj (dpo1) && im->hbh_enabled) ?
168 0 : (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
169 : }
170 4742940 : vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
171 4742940 : vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
172 :
173 4742940 : vlib_increment_combined_counter
174 : (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
175 4742940 : vlib_increment_combined_counter
176 : (cm, thread_index, lbi1, 1, vlib_buffer_length_in_chain (vm, p1));
177 :
178 4742940 : from += 2;
179 4742940 : to_next += 2;
180 4742940 : n_left_to_next -= 2;
181 4742940 : n_left_from -= 2;
182 :
183 4742940 : wrong_next = (next0 != next) + 2 * (next1 != next);
184 4742940 : if (PREDICT_FALSE (wrong_next != 0))
185 : {
186 1911 : switch (wrong_next)
187 : {
188 0 : case 1:
189 : /* A B A */
190 0 : to_next[-2] = pi1;
191 0 : to_next -= 1;
192 0 : n_left_to_next += 1;
193 0 : vlib_set_next_frame_buffer (vm, node, next0, pi0);
194 0 : break;
195 :
196 0 : case 2:
197 : /* A A B */
198 0 : to_next -= 1;
199 0 : n_left_to_next += 1;
200 0 : vlib_set_next_frame_buffer (vm, node, next1, pi1);
201 0 : break;
202 :
203 1911 : case 3:
204 : /* A B C */
205 1911 : to_next -= 2;
206 1911 : n_left_to_next += 2;
207 1911 : vlib_set_next_frame_buffer (vm, node, next0, pi0);
208 1911 : vlib_set_next_frame_buffer (vm, node, next1, pi1);
209 1911 : if (next0 == next1)
210 : {
211 : /* A B B */
212 1911 : vlib_put_next_frame (vm, node, next, n_left_to_next);
213 1911 : next = next1;
214 1911 : vlib_get_next_frame (vm, node, next, to_next,
215 : n_left_to_next);
216 : }
217 : }
218 : }
219 : }
220 :
221 740040 : while (n_left_from > 0 && n_left_to_next > 0)
222 : {
223 : vlib_buffer_t *p0;
224 : ip6_header_t *ip0;
225 : u32 pi0, lbi0;
226 : ip_lookup_next_t next0;
227 : load_balance_t *lb0;
228 : ip6_address_t *dst_addr0;
229 : u32 flow_hash_config0;
230 : const dpo_id_t *dpo0;
231 :
232 510338 : pi0 = from[0];
233 510338 : to_next[0] = pi0;
234 :
235 510338 : p0 = vlib_get_buffer (vm, pi0);
236 510338 : ip0 = vlib_buffer_get_current (p0);
237 510338 : dst_addr0 = &ip0->dst_address;
238 510338 : ip_lookup_set_buffer_fib_index (im->fib_index_by_sw_if_index, p0);
239 510338 : lbi0 = ip6_fib_table_fwding_lookup (vnet_buffer (p0)->ip.fib_index,
240 : dst_addr0);
241 :
242 510338 : lb0 = load_balance_get (lbi0);
243 510338 : flow_hash_config0 = lb0->lb_hash_config;
244 :
245 510338 : vnet_buffer (p0)->ip.flow_hash = 0;
246 510338 : ASSERT (lb0->lb_n_buckets > 0);
247 510338 : ASSERT (is_pow2 (lb0->lb_n_buckets));
248 :
249 510338 : if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
250 : {
251 25 : flow_hash_config0 = lb0->lb_hash_config;
252 50 : vnet_buffer (p0)->ip.flow_hash =
253 25 : ip6_compute_flow_hash (ip0, flow_hash_config0);
254 : dpo0 =
255 25 : load_balance_get_fwd_bucket (lb0,
256 25 : (vnet_buffer (p0)->ip.flow_hash &
257 25 : (lb0->lb_n_buckets_minus_1)));
258 : }
259 : else
260 : {
261 510313 : dpo0 = load_balance_get_bucket_i (lb0, 0);
262 : }
263 :
264 510338 : dpo0 = load_balance_get_bucket_i (lb0,
265 510338 : (vnet_buffer (p0)->ip.flow_hash &
266 510338 : lb0->lb_n_buckets_minus_1));
267 510338 : next0 = dpo0->dpoi_next_node;
268 :
269 : /* Only process the HBH Option Header if explicitly configured to do so */
270 510338 : if (PREDICT_FALSE
271 : (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
272 : {
273 10 : next0 = (dpo_is_adj (dpo0) && im->hbh_enabled) ?
274 6 : (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
275 : }
276 510338 : vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
277 :
278 510338 : vlib_increment_combined_counter
279 : (cm, thread_index, lbi0, 1, vlib_buffer_length_in_chain (vm, p0));
280 :
281 510338 : from += 1;
282 510338 : to_next += 1;
283 510338 : n_left_to_next -= 1;
284 510338 : n_left_from -= 1;
285 :
286 510338 : if (PREDICT_FALSE (next0 != next))
287 : {
288 775 : n_left_to_next += 1;
289 775 : vlib_put_next_frame (vm, node, next, n_left_to_next);
290 775 : next = next0;
291 775 : vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
292 775 : to_next[0] = pi0;
293 775 : to_next += 1;
294 775 : n_left_to_next -= 1;
295 : }
296 : }
297 :
298 229702 : vlib_put_next_frame (vm, node, next, n_left_to_next);
299 : }
300 :
301 229702 : if (node->flags & VLIB_NODE_FLAG_TRACE)
302 3260 : ip6_forward_next_trace (vm, node, frame, VLIB_TX);
303 :
304 229702 : return frame->n_vectors;
305 : }
306 :
307 : #endif /*__included_ip6_forward_h__ */
308 :
309 : /*
310 : * fd.io coding-style-patch-verification: ON
311 : *
312 : * Local Variables:
313 : * eval: (c-set-style "gnu")
314 : * End:
315 : */
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