blob: 7223b017df76a31ea9ecb1010e60bafb1a3026c3 [file] [log] [blame]
Ed Warnickecb9cada2015-12-08 15:45:58 -07001/*
2 * node.c: gre packet processing
3 *
4 * Copyright (c) 2012 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <vlib/vlib.h>
19#include <vnet/pg/pg.h>
20#include <vnet/gre/gre.h>
Neale Ranns0bfe5d82016-08-25 15:29:12 +010021#include <vnet/mpls/mpls.h>
Ed Warnickecb9cada2015-12-08 15:45:58 -070022#include <vppinfra/sparse_vec.h>
23
24#define foreach_gre_input_next \
25_(PUNT, "error-punt") \
26_(DROP, "error-drop") \
David Hothama8cd3092016-09-19 09:55:07 -070027_(ETHERNET_INPUT, "ethernet-input") \
Ed Warnickecb9cada2015-12-08 15:45:58 -070028_(IP4_INPUT, "ip4-input") \
Neale Ranns0bfe5d82016-08-25 15:29:12 +010029_(IP6_INPUT, "ip6-input") \
30_(MPLS_INPUT, "mpls-input")
Ed Warnickecb9cada2015-12-08 15:45:58 -070031
Swarup Nayak9ff647a2017-11-27 10:27:43 +053032typedef enum
33{
Ed Warnickecb9cada2015-12-08 15:45:58 -070034#define _(s,n) GRE_INPUT_NEXT_##s,
35 foreach_gre_input_next
36#undef _
Swarup Nayak9ff647a2017-11-27 10:27:43 +053037 GRE_INPUT_N_NEXT,
Ed Warnickecb9cada2015-12-08 15:45:58 -070038} gre_input_next_t;
39
Swarup Nayak9ff647a2017-11-27 10:27:43 +053040typedef struct
41{
Ed Warnickecb9cada2015-12-08 15:45:58 -070042 u32 tunnel_id;
43 u32 length;
Ciara Loftus7eac9162016-09-30 15:47:03 +010044 ip46_address_t src;
45 ip46_address_t dst;
46 u8 is_ipv6;
Ed Warnickecb9cada2015-12-08 15:45:58 -070047} gre_rx_trace_t;
48
Swarup Nayak9ff647a2017-11-27 10:27:43 +053049u8 *
50format_gre_rx_trace (u8 * s, va_list * args)
Ed Warnickecb9cada2015-12-08 15:45:58 -070051{
52 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
53 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
Swarup Nayak9ff647a2017-11-27 10:27:43 +053054 gre_rx_trace_t *t = va_arg (*args, gre_rx_trace_t *);
Ciara Loftus7eac9162016-09-30 15:47:03 +010055
Ed Warnickecb9cada2015-12-08 15:45:58 -070056 s = format (s, "GRE: tunnel %d len %d src %U dst %U",
Swarup Nayak9ff647a2017-11-27 10:27:43 +053057 t->tunnel_id, clib_net_to_host_u16 (t->length),
58 format_ip46_address, &t->src, IP46_TYPE_ANY,
59 format_ip46_address, &t->dst, IP46_TYPE_ANY);
Ed Warnickecb9cada2015-12-08 15:45:58 -070060 return s;
61}
62
Swarup Nayak9ff647a2017-11-27 10:27:43 +053063typedef struct
64{
Ciara Loftus7eac9162016-09-30 15:47:03 +010065 /* Sparse vector mapping gre protocol in network byte order
66 to next index. */
Swarup Nayak9ff647a2017-11-27 10:27:43 +053067 u16 *next_by_protocol;
Ciara Loftus7eac9162016-09-30 15:47:03 +010068} gre_input_runtime_t;
69
70always_inline uword
Ed Warnickecb9cada2015-12-08 15:45:58 -070071gre_input (vlib_main_t * vm,
Swarup Nayak9ff647a2017-11-27 10:27:43 +053072 vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_ipv6)
Ed Warnickecb9cada2015-12-08 15:45:58 -070073{
Swarup Nayak9ff647a2017-11-27 10:27:43 +053074 gre_main_t *gm = &gre_main;
75 __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
Neale Ranns33ce60d2017-12-14 08:51:32 -080076 gre_tunnel_key_t cached_tunnel_key;
77
78 u32 cached_tunnel_sw_if_index = ~0, tunnel_sw_if_index = ~0;
Ed Warnickecb9cada2015-12-08 15:45:58 -070079
Swarup Nayak9ff647a2017-11-27 10:27:43 +053080 u32 thread_index = vlib_get_thread_index ();
Neale Ranns0bfe5d82016-08-25 15:29:12 +010081 u32 len;
82 vnet_interface_main_t *im = &gm->vnet_main->interface_main;
Ed Warnickecb9cada2015-12-08 15:45:58 -070083
Ciara Loftus7eac9162016-09-30 15:47:03 +010084 if (!is_ipv6)
Neale Ranns33ce60d2017-12-14 08:51:32 -080085 memset (&cached_tunnel_key.gtk_v4, 0xff,
86 sizeof (cached_tunnel_key.gtk_v4));
Ciara Loftus7eac9162016-09-30 15:47:03 +010087 else
Neale Ranns33ce60d2017-12-14 08:51:32 -080088 memset (&cached_tunnel_key.gtk_v6, 0xff,
89 sizeof (cached_tunnel_key.gtk_v6));
Ciara Loftus7eac9162016-09-30 15:47:03 +010090
Ed Warnickecb9cada2015-12-08 15:45:58 -070091 from = vlib_frame_vector_args (from_frame);
92 n_left_from = from_frame->n_vectors;
93
94 next_index = node->cached_next_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -070095
96 while (n_left_from > 0)
97 {
98 u32 n_left_to_next;
99
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530100 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700101
102 while (n_left_from >= 4 && n_left_to_next >= 2)
103 {
104 u32 bi0, bi1;
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530105 vlib_buffer_t *b0, *b1;
106 gre_header_t *h0, *h1;
107 u16 version0, version1;
108 int verr0, verr1;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700109 u32 i0, i1, next0, next1, protocol0, protocol1;
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530110 ip4_header_t *ip4_0, *ip4_1;
111 ip6_header_t *ip6_0, *ip6_1;
Neale Ranns33ce60d2017-12-14 08:51:32 -0800112 gre_tunnel_key_t key0, key1;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700113
114 /* Prefetch next iteration. */
115 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530116 vlib_buffer_t *p2, *p3;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700117
118 p2 = vlib_get_buffer (vm, from[2]);
119 p3 = vlib_get_buffer (vm, from[3]);
120
121 vlib_prefetch_buffer_header (p2, LOAD);
122 vlib_prefetch_buffer_header (p3, LOAD);
123
124 CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
125 CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
126 }
127
128 bi0 = from[0];
129 bi1 = from[1];
130 to_next[0] = bi0;
131 to_next[1] = bi1;
132 from += 2;
133 to_next += 2;
134 n_left_to_next -= 2;
135 n_left_from -= 2;
136
137 b0 = vlib_get_buffer (vm, bi0);
138 b1 = vlib_get_buffer (vm, bi1);
139
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530140 if (!is_ipv6)
141 {
142 /* ip4_local hands us the ip header, not the gre header */
143 ip4_0 = vlib_buffer_get_current (b0);
144 ip4_1 = vlib_buffer_get_current (b1);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700145
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530146 vlib_buffer_advance (b0, sizeof (*ip4_0));
147 vlib_buffer_advance (b1, sizeof (*ip4_1));
148 }
149 else
150 {
151 /* ip6_local hands us the ip header, not the gre header */
152 ip6_0 = vlib_buffer_get_current (b0);
153 ip6_1 = vlib_buffer_get_current (b1);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700154
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530155 vlib_buffer_advance (b0, sizeof (*ip6_0));
156 vlib_buffer_advance (b1, sizeof (*ip6_1));
157 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700158
159 h0 = vlib_buffer_get_current (b0);
160 h1 = vlib_buffer_get_current (b1);
161
162 /* Index sparse array with network byte order. */
163 protocol0 = h0->protocol;
164 protocol1 = h1->protocol;
Damjan Marion63d5bae2017-04-04 01:28:26 +0200165 sparse_vec_index2 (gm->next_by_protocol, protocol0, protocol1,
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530166 &i0, &i1);
167 next0 = vec_elt (gm->next_by_protocol, i0);
168 next1 = vec_elt (gm->next_by_protocol, i1);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700169
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530170 b0->error =
171 node->errors[i0 ==
172 SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL
173 : GRE_ERROR_NONE];
174 b1->error =
175 node->errors[i1 ==
176 SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL
177 : GRE_ERROR_NONE];
Ed Warnickecb9cada2015-12-08 15:45:58 -0700178
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530179 version0 = clib_net_to_host_u16 (h0->flags_and_version);
180 verr0 = version0 & GRE_VERSION_MASK;
181 version1 = clib_net_to_host_u16 (h1->flags_and_version);
182 verr1 = version1 & GRE_VERSION_MASK;
183
184 b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
185 : b0->error;
186 next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
187 b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
188 : b1->error;
189 next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700190
David Hothama8cd3092016-09-19 09:55:07 -0700191
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530192 /* RPF check for ip4/ip6 input */
193 if (PREDICT_TRUE (next0 == GRE_INPUT_NEXT_IP4_INPUT
194 || next0 == GRE_INPUT_NEXT_IP6_INPUT
195 || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
196 || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
197 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800198 if (is_ipv6)
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530199 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800200 gre_mk_key6 (&ip6_0->dst_address,
201 &ip6_0->src_address,
202 vnet_buffer (b0)->ip.fib_index, &key0.gtk_v6);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530203 }
204 else
205 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800206 gre_mk_key4 (&ip4_0->dst_address,
207 &ip4_0->src_address,
208 vnet_buffer (b0)->ip.fib_index, &key0.gtk_v4);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530209 }
Ciara Loftus7eac9162016-09-30 15:47:03 +0100210
Neale Ranns33ce60d2017-12-14 08:51:32 -0800211 if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
212 &key0.gtk_v4)) ||
213 (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
214 &key0.gtk_v6)))
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530215 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530216 gre_tunnel_t *t;
217 uword *p;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700218
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530219 if (!is_ipv6)
Neale Ranns33ce60d2017-12-14 08:51:32 -0800220 {
221 p = hash_get_mem (gm->tunnel_by_key4, &key0.gtk_v4);
222 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530223 else
Neale Ranns33ce60d2017-12-14 08:51:32 -0800224 {
225 p = hash_get_mem (gm->tunnel_by_key6, &key0.gtk_v6);
226 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530227 if (!p)
228 {
229 next0 = GRE_INPUT_NEXT_DROP;
230 b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
231 goto drop0;
232 }
233 t = pool_elt_at_index (gm->tunnels, p[0]);
Neale Ranns33ce60d2017-12-14 08:51:32 -0800234 tunnel_sw_if_index = t->sw_if_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700235
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530236 cached_tunnel_sw_if_index = tunnel_sw_if_index;
Neale Ranns33ce60d2017-12-14 08:51:32 -0800237 if (!is_ipv6)
238 {
239 cached_tunnel_key.gtk_v4 = key0.gtk_v4;
240 }
241 else
242 {
243 cached_tunnel_key.gtk_v6 = key0.gtk_v6;
244 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530245 }
246 else
247 {
248 tunnel_sw_if_index = cached_tunnel_sw_if_index;
249 }
250 }
251 else
252 {
253 next0 = GRE_INPUT_NEXT_DROP;
254 goto drop0;
255 }
256 len = vlib_buffer_length_in_chain (vm, b0);
257 vlib_increment_combined_counter (im->combined_sw_if_counters
258 + VNET_INTERFACE_COUNTER_RX,
259 thread_index,
260 tunnel_sw_if_index,
261 1 /* packets */ ,
262 len /* bytes */ );
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100263
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530264 vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700265
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530266 drop0:
267 if (PREDICT_TRUE (next1 == GRE_INPUT_NEXT_IP4_INPUT
268 || next1 == GRE_INPUT_NEXT_IP6_INPUT
269 || next1 == GRE_INPUT_NEXT_ETHERNET_INPUT
270 || next1 == GRE_INPUT_NEXT_MPLS_INPUT))
271 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800272 if (is_ipv6)
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530273 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800274 gre_mk_key6 (&ip6_1->dst_address,
275 &ip6_1->src_address,
276 vnet_buffer (b1)->ip.fib_index, &key1.gtk_v6);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530277 }
278 else
279 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800280 gre_mk_key4 (&ip4_1->dst_address,
281 &ip4_1->src_address,
282 vnet_buffer (b1)->ip.fib_index, &key1.gtk_v4);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530283 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700284
Neale Ranns33ce60d2017-12-14 08:51:32 -0800285 if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
286 &key1.gtk_v4)) ||
287 (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
288 &key1.gtk_v6)))
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530289 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530290 gre_tunnel_t *t;
291 uword *p;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700292
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530293 if (!is_ipv6)
Neale Ranns33ce60d2017-12-14 08:51:32 -0800294 {
295 p = hash_get_mem (gm->tunnel_by_key4, &key1.gtk_v4);
296 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530297 else
Neale Ranns33ce60d2017-12-14 08:51:32 -0800298 {
299 p = hash_get_mem (gm->tunnel_by_key6, &key1.gtk_v6);
300 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530301 if (!p)
302 {
303 next1 = GRE_INPUT_NEXT_DROP;
304 b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
305 goto drop1;
306 }
307 t = pool_elt_at_index (gm->tunnels, p[0]);
Neale Ranns33ce60d2017-12-14 08:51:32 -0800308 tunnel_sw_if_index = t->sw_if_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700309
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530310 cached_tunnel_sw_if_index = tunnel_sw_if_index;
Neale Ranns33ce60d2017-12-14 08:51:32 -0800311 if (!is_ipv6)
312 {
313 cached_tunnel_key.gtk_v4 = key1.gtk_v4;
314 }
315 else
316 {
317 cached_tunnel_key.gtk_v6 = key1.gtk_v6;
318 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530319 }
320 else
321 {
322 tunnel_sw_if_index = cached_tunnel_sw_if_index;
323 }
324 }
325 else
326 {
327 next1 = GRE_INPUT_NEXT_DROP;
328 goto drop1;
329 }
330 len = vlib_buffer_length_in_chain (vm, b1);
331 vlib_increment_combined_counter (im->combined_sw_if_counters
332 + VNET_INTERFACE_COUNTER_RX,
333 thread_index,
334 tunnel_sw_if_index,
335 1 /* packets */ ,
336 len /* bytes */ );
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100337
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530338 vnet_buffer (b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100339
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530340 drop1:
341 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
342 {
343 gre_rx_trace_t *tr = vlib_add_trace (vm, node,
344 b0, sizeof (*tr));
345 tr->tunnel_id = tunnel_sw_if_index;
346 if (!is_ipv6)
347 {
348 tr->length = ip4_0->length;
349 tr->src.ip4.as_u32 = ip4_0->src_address.as_u32;
350 tr->dst.ip4.as_u32 = ip4_0->dst_address.as_u32;
351 }
352 else
353 {
354 tr->length = ip6_0->payload_length;
355 tr->src.ip6.as_u64[0] = ip6_0->src_address.as_u64[0];
356 tr->src.ip6.as_u64[1] = ip6_0->src_address.as_u64[1];
357 tr->dst.ip6.as_u64[0] = ip6_0->dst_address.as_u64[0];
358 tr->dst.ip6.as_u64[1] = ip6_0->dst_address.as_u64[1];
359 }
360 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700361
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530362 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
363 {
364 gre_rx_trace_t *tr = vlib_add_trace (vm, node,
365 b1, sizeof (*tr));
366 tr->tunnel_id = tunnel_sw_if_index;
367 if (!is_ipv6)
368 {
369 tr->length = ip4_1->length;
370 tr->src.ip4.as_u32 = ip4_1->src_address.as_u32;
371 tr->dst.ip4.as_u32 = ip4_1->dst_address.as_u32;
372 }
373 else
374 {
375 tr->length = ip6_1->payload_length;
376 tr->src.ip6.as_u64[0] = ip6_1->src_address.as_u64[0];
377 tr->src.ip6.as_u64[1] = ip6_1->src_address.as_u64[1];
378 tr->dst.ip6.as_u64[0] = ip6_1->dst_address.as_u64[0];
379 tr->dst.ip6.as_u64[1] = ip6_1->dst_address.as_u64[1];
380 }
381 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700382
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530383 vlib_buffer_advance (b0, sizeof (*h0));
384 vlib_buffer_advance (b1, sizeof (*h1));
Ed Warnickecb9cada2015-12-08 15:45:58 -0700385
386 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
387 to_next, n_left_to_next,
388 bi0, bi1, next0, next1);
389 }
Ciara Loftus7eac9162016-09-30 15:47:03 +0100390
Ed Warnickecb9cada2015-12-08 15:45:58 -0700391 while (n_left_from > 0 && n_left_to_next > 0)
392 {
393 u32 bi0;
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530394 vlib_buffer_t *b0;
395 gre_header_t *h0;
396 ip4_header_t *ip4_0;
397 ip6_header_t *ip6_0;
398 u16 version0;
399 int verr0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700400 u32 i0, next0;
Neale Ranns33ce60d2017-12-14 08:51:32 -0800401 gre_tunnel_key_t key0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700402
403 bi0 = from[0];
404 to_next[0] = bi0;
405 from += 1;
406 to_next += 1;
407 n_left_from -= 1;
408 n_left_to_next -= 1;
409
410 b0 = vlib_get_buffer (vm, bi0);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530411 ip4_0 = vlib_buffer_get_current (b0);
412 ip6_0 = (void *) ip4_0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700413
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530414 if (!is_ipv6)
415 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530416 vlib_buffer_advance (b0, sizeof (*ip4_0));
417 }
418 else
419 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530420 vlib_buffer_advance (b0, sizeof (*ip6_0));
421 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700422
423 h0 = vlib_buffer_get_current (b0);
424
Damjan Marion63d5bae2017-04-04 01:28:26 +0200425 i0 = sparse_vec_index (gm->next_by_protocol, h0->protocol);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530426 next0 = vec_elt (gm->next_by_protocol, i0);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700427
Ciara Loftus7eac9162016-09-30 15:47:03 +0100428 b0->error =
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530429 node->errors[i0 == SPARSE_VEC_INVALID_INDEX
430 ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
Ciara Loftus7eac9162016-09-30 15:47:03 +0100431
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530432 version0 = clib_net_to_host_u16 (h0->flags_and_version);
433 verr0 = version0 & GRE_VERSION_MASK;
434 b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
435 : b0->error;
436 next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700437
David Hothama8cd3092016-09-19 09:55:07 -0700438
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530439 /* For IP payload we need to find source interface
440 so we can increase counters and help forward node to
441 pick right FIB */
442 /* RPF check for ip4/ip6 input */
443 if (PREDICT_TRUE (next0 == GRE_INPUT_NEXT_IP4_INPUT
444 || next0 == GRE_INPUT_NEXT_IP6_INPUT
445 || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
446 || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
447 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800448 if (is_ipv6)
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530449 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800450 gre_mk_key6 (&ip6_0->dst_address,
451 &ip6_0->src_address,
452 vnet_buffer (b0)->ip.fib_index, &key0.gtk_v6);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530453 }
454 else
455 {
Neale Ranns33ce60d2017-12-14 08:51:32 -0800456 gre_mk_key4 (&ip4_0->dst_address,
457 &ip4_0->src_address,
458 vnet_buffer (b0)->ip.fib_index, &key0.gtk_v4);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530459 }
Ciara Loftus7eac9162016-09-30 15:47:03 +0100460
Neale Ranns33ce60d2017-12-14 08:51:32 -0800461 if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
462 &key0.gtk_v4)) ||
463 (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
464 &key0.gtk_v6)))
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530465 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530466 gre_tunnel_t *t;
467 uword *p;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700468
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530469 if (!is_ipv6)
Neale Ranns33ce60d2017-12-14 08:51:32 -0800470 {
471 p = hash_get_mem (gm->tunnel_by_key4, &key0.gtk_v4);
472 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530473 else
Neale Ranns33ce60d2017-12-14 08:51:32 -0800474 {
475 p = hash_get_mem (gm->tunnel_by_key6, &key0.gtk_v6);
476 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530477 if (!p)
478 {
479 next0 = GRE_INPUT_NEXT_DROP;
480 b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
481 goto drop;
482 }
483 t = pool_elt_at_index (gm->tunnels, p[0]);
Neale Ranns33ce60d2017-12-14 08:51:32 -0800484 tunnel_sw_if_index = t->sw_if_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700485
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530486 cached_tunnel_sw_if_index = tunnel_sw_if_index;
Neale Ranns33ce60d2017-12-14 08:51:32 -0800487 if (!is_ipv6)
488 {
489 cached_tunnel_key.gtk_v4 = key0.gtk_v4;
490 }
491 else
492 {
493 cached_tunnel_key.gtk_v6 = key0.gtk_v6;
494 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530495 }
496 else
497 {
498 tunnel_sw_if_index = cached_tunnel_sw_if_index;
499 }
500 }
501 else
502 {
503 next0 = GRE_INPUT_NEXT_DROP;
504 goto drop;
505 }
506 len = vlib_buffer_length_in_chain (vm, b0);
507 vlib_increment_combined_counter (im->combined_sw_if_counters
508 + VNET_INTERFACE_COUNTER_RX,
509 thread_index,
510 tunnel_sw_if_index,
511 1 /* packets */ ,
512 len /* bytes */ );
Neale Ranns0bfe5d82016-08-25 15:29:12 +0100513
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530514 vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700515
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530516 drop:
517 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
518 {
519 gre_rx_trace_t *tr = vlib_add_trace (vm, node,
520 b0, sizeof (*tr));
521 tr->tunnel_id = tunnel_sw_if_index;
522 if (!is_ipv6)
523 {
524 tr->length = ip4_0->length;
525 tr->src.ip4.as_u32 = ip4_0->src_address.as_u32;
526 tr->dst.ip4.as_u32 = ip4_0->dst_address.as_u32;
527 }
528 else
529 {
530 tr->length = ip6_0->payload_length;
531 tr->src.ip6.as_u64[0] = ip6_0->src_address.as_u64[0];
532 tr->src.ip6.as_u64[1] = ip6_0->src_address.as_u64[1];
533 tr->dst.ip6.as_u64[0] = ip6_0->dst_address.as_u64[0];
534 tr->dst.ip6.as_u64[1] = ip6_0->dst_address.as_u64[1];
535 }
536 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700537
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530538 vlib_buffer_advance (b0, sizeof (*h0));
Ed Warnickecb9cada2015-12-08 15:45:58 -0700539
540 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
541 to_next, n_left_to_next,
542 bi0, next0);
543 }
544
545 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
546 }
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530547 vlib_node_increment_counter (vm,
548 !is_ipv6 ? gre4_input_node.index :
549 gre6_input_node.index, GRE_ERROR_PKTS_DECAP,
550 from_frame->n_vectors);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700551 return from_frame->n_vectors;
552}
553
Ciara Loftus7eac9162016-09-30 15:47:03 +0100554static uword
555gre4_input (vlib_main_t * vm,
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530556 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
Ciara Loftus7eac9162016-09-30 15:47:03 +0100557{
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530558 return gre_input (vm, node, from_frame, /* is_ip6 */ 0);
Ciara Loftus7eac9162016-09-30 15:47:03 +0100559}
560
561static uword
562gre6_input (vlib_main_t * vm,
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530563 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
Ciara Loftus7eac9162016-09-30 15:47:03 +0100564{
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530565 return gre_input (vm, node, from_frame, /* is_ip6 */ 1);
Ciara Loftus7eac9162016-09-30 15:47:03 +0100566}
567
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530568static char *gre_error_strings[] = {
Ed Warnickecb9cada2015-12-08 15:45:58 -0700569#define gre_error(n,s) s,
570#include "error.def"
571#undef gre_error
572};
573
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530574/* *INDENT-OFF* */
Ciara Loftus7eac9162016-09-30 15:47:03 +0100575VLIB_REGISTER_NODE (gre4_input_node) = {
576 .function = gre4_input,
577 .name = "gre4-input",
Ed Warnickecb9cada2015-12-08 15:45:58 -0700578 /* Takes a vector of packets. */
579 .vector_size = sizeof (u32),
580
Ed Warnickecb9cada2015-12-08 15:45:58 -0700581 .n_errors = GRE_N_ERROR,
582 .error_strings = gre_error_strings,
583
584 .n_next_nodes = GRE_INPUT_N_NEXT,
585 .next_nodes = {
586#define _(s,n) [GRE_INPUT_NEXT_##s] = n,
587 foreach_gre_input_next
588#undef _
589 },
590
591 .format_buffer = format_gre_header_with_length,
592 .format_trace = format_gre_rx_trace,
593 .unformat_buffer = unformat_gre_header,
594};
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530595/* *INDENT-ON* */
Ed Warnickecb9cada2015-12-08 15:45:58 -0700596
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530597/* *INDENT-OFF* */
Ciara Loftus7eac9162016-09-30 15:47:03 +0100598VLIB_REGISTER_NODE (gre6_input_node) = {
599 .function = gre6_input,
600 .name = "gre6-input",
601 /* Takes a vector of packets. */
602 .vector_size = sizeof (u32),
603
604 .runtime_data_bytes = sizeof (gre_input_runtime_t),
605
606 .n_errors = GRE_N_ERROR,
607 .error_strings = gre_error_strings,
608
609 .n_next_nodes = GRE_INPUT_N_NEXT,
610 .next_nodes = {
611#define _(s,n) [GRE_INPUT_NEXT_##s] = n,
612 foreach_gre_input_next
613#undef _
614 },
615
616 .format_buffer = format_gre_header_with_length,
617 .format_trace = format_gre_rx_trace,
618 .unformat_buffer = unformat_gre_header,
619};
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530620/* *INDENT-ON* */
Ciara Loftus7eac9162016-09-30 15:47:03 +0100621
622VLIB_NODE_FUNCTION_MULTIARCH (gre4_input_node, gre4_input)
623VLIB_NODE_FUNCTION_MULTIARCH (gre6_input_node, gre6_input)
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530624 void
625 gre_register_input_protocol (vlib_main_t * vm,
626 gre_protocol_t protocol, u32 node_index)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700627{
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530628 gre_main_t *em = &gre_main;
629 gre_protocol_info_t *pi;
630 u16 *n;
Ciara Loftus7eac9162016-09-30 15:47:03 +0100631 u32 i;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700632
633 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530634 clib_error_t *error = vlib_call_init_function (vm, gre_input_init);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700635 if (error)
636 clib_error_report (error);
637 }
638
639 pi = gre_get_protocol_info (em, protocol);
640 pi->node_index = node_index;
Ciara Loftus7eac9162016-09-30 15:47:03 +0100641 pi->next_index = vlib_node_add_next (vm, gre4_input_node.index, node_index);
642 i = vlib_node_add_next (vm, gre6_input_node.index, node_index);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530643 ASSERT (i == pi->next_index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700644
645 /* Setup gre protocol -> next index sparse vector mapping. */
Damjan Marion63d5bae2017-04-04 01:28:26 +0200646 n = sparse_vec_validate (em->next_by_protocol,
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530647 clib_host_to_net_u16 (protocol));
Damjan Marion63d5bae2017-04-04 01:28:26 +0200648 n[0] = pi->next_index;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700649}
650
651static void
652gre_setup_node (vlib_main_t * vm, u32 node_index)
653{
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530654 vlib_node_t *n = vlib_get_node (vm, node_index);
655 pg_node_t *pn = pg_get_node (node_index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700656
657 n->format_buffer = format_gre_header_with_length;
658 n->unformat_buffer = unformat_gre_header;
659 pn->unformat_edit = unformat_pg_gre_header;
660}
661
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530662static clib_error_t *
663gre_input_init (vlib_main_t * vm)
Ed Warnickecb9cada2015-12-08 15:45:58 -0700664{
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530665 gre_main_t *gm = &gre_main;
David Hothama8cd3092016-09-19 09:55:07 -0700666 vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700667
668 {
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530669 clib_error_t *error;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700670 error = vlib_call_init_function (vm, gre_init);
671 if (error)
672 clib_error_report (error);
673 }
674
Ciara Loftus7eac9162016-09-30 15:47:03 +0100675 gre_setup_node (vm, gre4_input_node.index);
676 gre_setup_node (vm, gre6_input_node.index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700677
Damjan Marion63d5bae2017-04-04 01:28:26 +0200678 gm->next_by_protocol = sparse_vec_new
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530679 ( /* elt bytes */ sizeof (gm->next_by_protocol[0]),
Ed Warnickecb9cada2015-12-08 15:45:58 -0700680 /* bits in index */ BITS (((gre_header_t *) 0)->protocol));
681
Ed Warnickecb9cada2015-12-08 15:45:58 -0700682 /* These could be moved to the supported protocol input node defn's */
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530683 ethernet_input = vlib_get_node_by_name (vm, (u8 *) "ethernet-input");
684 ASSERT (ethernet_input);
685 ip4_input = vlib_get_node_by_name (vm, (u8 *) "ip4-input");
686 ASSERT (ip4_input);
687 ip6_input = vlib_get_node_by_name (vm, (u8 *) "ip6-input");
688 ASSERT (ip6_input);
689 mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *) "mpls-input");
690 ASSERT (mpls_unicast_input);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700691
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530692 gre_register_input_protocol (vm, GRE_PROTOCOL_teb, ethernet_input->index);
David Hothama8cd3092016-09-19 09:55:07 -0700693
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530694 gre_register_input_protocol (vm, GRE_PROTOCOL_ip4, ip4_input->index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700695
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530696 gre_register_input_protocol (vm, GRE_PROTOCOL_ip6, ip6_input->index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700697
698 gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530699 mpls_unicast_input->index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700700
Ciara Loftus7eac9162016-09-30 15:47:03 +0100701 ip4_register_protocol (IP_PROTOCOL_GRE, gre4_input_node.index);
702 ip6_register_protocol (IP_PROTOCOL_GRE, gre6_input_node.index);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700703
704 return 0;
705}
706
707VLIB_INIT_FUNCTION (gre_input_init);
Swarup Nayak9ff647a2017-11-27 10:27:43 +0530708
709/*
710 * fd.io coding-style-patch-verification: ON
711 *
712 * Local Variables:
713 * eval: (c-set-style "gnu")
714 * End:
715 */