Line data Source code
1 : /*
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:
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 : * @file
17 : * @brief Functions for encapsulating VXLAN GPE tunnels
18 : *
19 : */
20 : #include <vppinfra/error.h>
21 : #include <vppinfra/hash.h>
22 : #include <vnet/vnet.h>
23 : #include <vnet/ip/ip.h>
24 : #include <vnet/ethernet/ethernet.h>
25 : #include <vnet/udp/udp_inlines.h>
26 : #include <vnet/vxlan-gpe/vxlan_gpe.h>
27 :
28 : /** Statistics (not really errors) */
29 : #define foreach_vxlan_gpe_encap_error \
30 : _(ENCAPSULATED, "good packets encapsulated")
31 :
32 : /**
33 : * @brief VXLAN GPE encap error strings
34 : */
35 : static char *vxlan_gpe_encap_error_strings[] = {
36 : #define _(sym,string) string,
37 : foreach_vxlan_gpe_encap_error
38 : #undef _
39 : };
40 :
41 : /**
42 : * @brief Struct for VXLAN GPE errors/counters
43 : */
44 : typedef enum
45 : {
46 : #define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym,
47 : foreach_vxlan_gpe_encap_error
48 : #undef _
49 : VXLAN_GPE_ENCAP_N_ERROR,
50 : } vxlan_gpe_encap_error_t;
51 :
52 : /**
53 : * @brief Struct for tracing VXLAN GPE encapsulated packets
54 : */
55 : typedef struct
56 : {
57 : u32 tunnel_index;
58 : } vxlan_gpe_encap_trace_t;
59 :
60 : /**
61 : * @brief Trace of packets encapsulated in VXLAN GPE
62 : *
63 : * @param *s
64 : * @param *args
65 : *
66 : * @return *s
67 : *
68 : */
69 : u8 *
70 0 : format_vxlan_gpe_encap_trace (u8 * s, va_list * args)
71 : {
72 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
73 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
74 0 : vxlan_gpe_encap_trace_t *t = va_arg (*args, vxlan_gpe_encap_trace_t *);
75 :
76 0 : s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index);
77 0 : return s;
78 : }
79 :
80 : /**
81 : * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup
82 : *
83 : * @param *ngm
84 : * @param *b0
85 : * @param *t0 contains rewrite header
86 : * @param *next0 relative index of next dispatch function (next node)
87 : * @param is_v4 Is this IPv4? (or IPv6)
88 : *
89 : */
90 : always_inline void
91 0 : vxlan_gpe_encap_one_inline (vxlan_gpe_main_t *ngm, vlib_buffer_t *b0,
92 : vxlan_gpe_tunnel_t *t0, u32 *next0,
93 : ip_address_family_t af)
94 : {
95 : ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36);
96 : ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56);
97 :
98 0 : ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, af,
99 : N_AF, UDP_ENCAP_FIXUP_NONE);
100 0 : next0[0] = t0->encap_next_node;
101 0 : }
102 :
103 : /**
104 : * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup for two packets
105 : *
106 : * @param *ngm
107 : * @param *b0 Packet0
108 : * @param *b1 Packet1
109 : * @param *t0 contains rewrite header for Packet0
110 : * @param *t1 contains rewrite header for Packet1
111 : * @param *next0 relative index of next dispatch function (next node) for Packet0
112 : * @param *next1 relative index of next dispatch function (next node) for Packet1
113 : * @param is_v4 Is this IPv4? (or IPv6)
114 : *
115 : */
116 : always_inline void
117 0 : vxlan_gpe_encap_two_inline (vxlan_gpe_main_t *ngm, vlib_buffer_t *b0,
118 : vlib_buffer_t *b1, vxlan_gpe_tunnel_t *t0,
119 : vxlan_gpe_tunnel_t *t1, u32 *next0, u32 *next1,
120 : ip_address_family_t af)
121 : {
122 : ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36);
123 : ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56);
124 :
125 0 : ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, af,
126 : N_AF, UDP_ENCAP_FIXUP_NONE);
127 0 : ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, af,
128 : N_AF, UDP_ENCAP_FIXUP_NONE);
129 0 : next0[0] = next1[0] = t0->encap_next_node;
130 0 : }
131 :
132 : /**
133 : * @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions
134 : *
135 : * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE
136 : * tunnels are "establish local". This means that we don't have a TX interface as yet
137 : * as we need to look up where the outer-header dest is. By setting the TX index in the
138 : * buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX.
139 : *
140 : * vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
141 : *
142 : * @node vxlan-gpe-input
143 : * @param *vm
144 : * @param *node
145 : * @param *from_frame
146 : *
147 : * @return from_frame->n_vectors
148 : *
149 : */
150 : static uword
151 0 : vxlan_gpe_encap (vlib_main_t * vm,
152 : vlib_node_runtime_t * node, vlib_frame_t * from_frame)
153 : {
154 : u32 n_left_from, next_index, *from, *to_next;
155 0 : vxlan_gpe_main_t *ngm = &vxlan_gpe_main;
156 0 : vnet_main_t *vnm = ngm->vnet_main;
157 0 : vnet_interface_main_t *im = &vnm->interface_main;
158 0 : u32 pkts_encapsulated = 0;
159 0 : u32 thread_index = vm->thread_index;
160 : u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
161 0 : vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
162 :
163 0 : from = vlib_frame_vector_args (from_frame);
164 0 : n_left_from = from_frame->n_vectors;
165 :
166 0 : next_index = node->cached_next_index;
167 0 : stats_sw_if_index = node->runtime_data[0];
168 0 : stats_n_packets = stats_n_bytes = 0;
169 0 : vlib_get_buffers (vm, from, bufs, n_left_from);
170 :
171 0 : while (n_left_from > 0)
172 : {
173 : u32 n_left_to_next;
174 0 : u32 sw_if_index0 = ~0, sw_if_index1 = ~0, len0, len1;
175 : vnet_hw_interface_t *hi0, *hi1;
176 0 : vxlan_gpe_tunnel_t *t0 = NULL, *t1 = NULL;
177 0 : ip_address_family_t af_0 = AF_IP4, af_1 = AF_IP4;
178 :
179 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
180 :
181 0 : while (n_left_from >= 4 && n_left_to_next >= 2)
182 : {
183 : u32 bi0, bi1;
184 : u32 next0, next1;
185 :
186 0 : next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
187 :
188 : /* Prefetch next iteration. */
189 : {
190 0 : vlib_prefetch_buffer_header (b[2], LOAD);
191 0 : vlib_prefetch_buffer_header (b[3], LOAD);
192 :
193 0 : CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES,
194 : 2 * CLIB_CACHE_LINE_BYTES, LOAD);
195 0 : CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES,
196 : 2 * CLIB_CACHE_LINE_BYTES, LOAD);
197 : }
198 :
199 0 : bi0 = from[0];
200 0 : bi1 = from[1];
201 0 : to_next[0] = bi0;
202 0 : to_next[1] = bi1;
203 0 : from += 2;
204 0 : to_next += 2;
205 0 : n_left_to_next -= 2;
206 0 : n_left_from -= 2;
207 :
208 : /* get "af_0" */
209 0 : if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
210 : {
211 0 : sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
212 : hi0 =
213 0 : vnet_get_sup_hw_interface (vnm,
214 0 : vnet_buffer (b[0])->sw_if_index
215 : [VLIB_TX]);
216 0 : t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
217 0 : af_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6);
218 : }
219 :
220 : /* get "af_1" */
221 0 : if (sw_if_index1 != vnet_buffer (b[1])->sw_if_index[VLIB_TX])
222 : {
223 0 : if (sw_if_index0 == vnet_buffer (b[1])->sw_if_index[VLIB_TX])
224 : {
225 0 : sw_if_index1 = sw_if_index0;
226 0 : hi1 = hi0;
227 0 : t1 = t0;
228 0 : af_1 = af_0;
229 : }
230 : else
231 : {
232 0 : sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
233 : hi1 =
234 0 : vnet_get_sup_hw_interface (vnm,
235 0 : vnet_buffer (b[1])->sw_if_index
236 : [VLIB_TX]);
237 0 : t1 = pool_elt_at_index (ngm->tunnels, hi1->dev_instance);
238 0 : af_1 =
239 0 : (t1->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6);
240 : }
241 : }
242 :
243 0 : if (PREDICT_TRUE (af_0 == af_1))
244 : {
245 0 : vxlan_gpe_encap_two_inline (ngm, b[0], b[1], t0, t1, &next0,
246 : &next1, af_0);
247 : }
248 : else
249 : {
250 0 : vxlan_gpe_encap_one_inline (ngm, b[0], t0, &next0, af_0);
251 0 : vxlan_gpe_encap_one_inline (ngm, b[1], t1, &next1, af_1);
252 : }
253 :
254 : /* Reset to look up tunnel partner in the configured FIB */
255 0 : vnet_buffer (b[0])->sw_if_index[VLIB_TX] = t0->encap_fib_index;
256 0 : vnet_buffer (b[1])->sw_if_index[VLIB_TX] = t1->encap_fib_index;
257 0 : vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0;
258 0 : vnet_buffer (b[1])->sw_if_index[VLIB_RX] = sw_if_index1;
259 0 : pkts_encapsulated += 2;
260 :
261 0 : len0 = vlib_buffer_length_in_chain (vm, b[0]);
262 0 : len1 = vlib_buffer_length_in_chain (vm, b[1]);
263 0 : stats_n_packets += 2;
264 0 : stats_n_bytes += len0 + len1;
265 :
266 : /* Batch stats increment on the same vxlan tunnel so counter is not
267 : incremented per packet. Note stats are still incremented for deleted
268 : and admin-down tunnel where packets are dropped. It is not worthwhile
269 : to check for this rare case and affect normal path performance. */
270 0 : if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index)
271 : || (sw_if_index1 != stats_sw_if_index)))
272 : {
273 0 : stats_n_packets -= 2;
274 0 : stats_n_bytes -= len0 + len1;
275 0 : if (sw_if_index0 == sw_if_index1)
276 : {
277 0 : if (stats_n_packets)
278 0 : vlib_increment_combined_counter
279 0 : (im->combined_sw_if_counters +
280 : VNET_INTERFACE_COUNTER_TX, thread_index,
281 : stats_sw_if_index, stats_n_packets, stats_n_bytes);
282 0 : stats_sw_if_index = sw_if_index0;
283 0 : stats_n_packets = 2;
284 0 : stats_n_bytes = len0 + len1;
285 : }
286 : else
287 : {
288 0 : vlib_increment_combined_counter (im->combined_sw_if_counters
289 : +
290 : VNET_INTERFACE_COUNTER_TX,
291 : thread_index, sw_if_index0,
292 : 1, len0);
293 0 : vlib_increment_combined_counter (im->combined_sw_if_counters
294 : +
295 : VNET_INTERFACE_COUNTER_TX,
296 : thread_index, sw_if_index1,
297 : 1, len1);
298 : }
299 : }
300 :
301 0 : if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
302 : {
303 : vxlan_gpe_encap_trace_t *tr =
304 0 : vlib_add_trace (vm, node, b[0], sizeof (*tr));
305 0 : tr->tunnel_index = t0 - ngm->tunnels;
306 : }
307 :
308 0 : if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
309 : {
310 0 : vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b[1],
311 : sizeof (*tr));
312 0 : tr->tunnel_index = t1 - ngm->tunnels;
313 : }
314 0 : b += 2;
315 :
316 0 : vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
317 : n_left_to_next, bi0, bi1, next0,
318 : next1);
319 : }
320 :
321 0 : while (n_left_from > 0 && n_left_to_next > 0)
322 : {
323 : u32 bi0;
324 0 : u32 next0 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP;
325 :
326 0 : bi0 = from[0];
327 0 : to_next[0] = bi0;
328 0 : from += 1;
329 0 : to_next += 1;
330 0 : n_left_from -= 1;
331 0 : n_left_to_next -= 1;
332 :
333 : /* get "af_0" */
334 0 : if (sw_if_index0 != vnet_buffer (b[0])->sw_if_index[VLIB_TX])
335 : {
336 0 : sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
337 : hi0 =
338 0 : vnet_get_sup_hw_interface (vnm,
339 0 : vnet_buffer (b[0])->sw_if_index
340 : [VLIB_TX]);
341 :
342 0 : t0 = pool_elt_at_index (ngm->tunnels, hi0->dev_instance);
343 :
344 0 : af_0 = (t0->flags & VXLAN_GPE_TUNNEL_IS_IPV4 ? AF_IP4 : AF_IP6);
345 : }
346 :
347 0 : vxlan_gpe_encap_one_inline (ngm, b[0], t0, &next0, af_0);
348 :
349 : /* Reset to look up tunnel partner in the configured FIB */
350 0 : vnet_buffer (b[0])->sw_if_index[VLIB_TX] = t0->encap_fib_index;
351 0 : vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0;
352 0 : pkts_encapsulated++;
353 :
354 0 : len0 = vlib_buffer_length_in_chain (vm, b[0]);
355 0 : stats_n_packets += 1;
356 0 : stats_n_bytes += len0;
357 :
358 : /* Batch stats increment on the same vxlan tunnel so counter is not
359 : * incremented per packet. Note stats are still incremented for deleted
360 : * and admin-down tunnel where packets are dropped. It is not worthwhile
361 : * to check for this rare case and affect normal path performance. */
362 0 : if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
363 : {
364 0 : stats_n_packets -= 1;
365 0 : stats_n_bytes -= len0;
366 0 : if (stats_n_packets)
367 0 : vlib_increment_combined_counter (im->combined_sw_if_counters +
368 : VNET_INTERFACE_COUNTER_TX,
369 : thread_index,
370 : stats_sw_if_index,
371 : stats_n_packets,
372 : stats_n_bytes);
373 0 : stats_n_packets = 1;
374 0 : stats_n_bytes = len0;
375 0 : stats_sw_if_index = sw_if_index0;
376 : }
377 0 : if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
378 : {
379 0 : vxlan_gpe_encap_trace_t *tr = vlib_add_trace (vm, node, b[0],
380 : sizeof (*tr));
381 0 : tr->tunnel_index = t0 - ngm->tunnels;
382 : }
383 0 : b += 1;
384 :
385 0 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
386 : n_left_to_next, bi0, next0);
387 : }
388 :
389 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
390 : }
391 0 : vlib_node_increment_counter (vm, node->node_index,
392 : VXLAN_GPE_ENCAP_ERROR_ENCAPSULATED,
393 : pkts_encapsulated);
394 : /* Increment any remaining batch stats */
395 0 : if (stats_n_packets)
396 : {
397 0 : vlib_increment_combined_counter (im->combined_sw_if_counters +
398 : VNET_INTERFACE_COUNTER_TX,
399 : thread_index, stats_sw_if_index,
400 : stats_n_packets, stats_n_bytes);
401 0 : node->runtime_data[0] = stats_sw_if_index;
402 : }
403 :
404 0 : return from_frame->n_vectors;
405 : }
406 :
407 : /* *INDENT-OFF* */
408 178120 : VLIB_REGISTER_NODE (vxlan_gpe_encap_node) = {
409 : .function = vxlan_gpe_encap,
410 : .name = "vxlan-gpe-encap",
411 : .vector_size = sizeof (u32),
412 : .format_trace = format_vxlan_gpe_encap_trace,
413 : .type = VLIB_NODE_TYPE_INTERNAL,
414 :
415 : .n_errors = ARRAY_LEN(vxlan_gpe_encap_error_strings),
416 : .error_strings = vxlan_gpe_encap_error_strings,
417 :
418 : .n_next_nodes = VXLAN_GPE_ENCAP_N_NEXT,
419 :
420 : .next_nodes = {
421 : [VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
422 : [VXLAN_GPE_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
423 : [VXLAN_GPE_ENCAP_NEXT_DROP] = "error-drop",
424 : },
425 : };
426 : /* *INDENT-ON* */
427 :
428 :
429 : /*
430 : * fd.io coding-style-patch-verification: ON
431 : *
432 : * Local Variables:
433 : * eval: (c-set-style "gnu")
434 : * End:
435 : */
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