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 <vppinfra/error.h>
16 #include <vppinfra/hash.h>
17 #include <vnet/vnet.h>
18 #include <vnet/ip/ip.h>
19 #include <vnet/ethernet/ethernet.h>
20 #include <vnet/vxlan/vxlan.h>
22 /* Statistics (not all errors) */
23 #define foreach_vxlan_encap_error \
24 _(ENCAPSULATED, "good packets encapsulated")
26 static char * vxlan_encap_error_strings[] = {
27 #define _(sym,string) string,
28 foreach_vxlan_encap_error
33 #define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
34 foreach_vxlan_encap_error
37 } vxlan_encap_error_t;
40 VXLAN_ENCAP_NEXT_DROP,
47 } vxlan_encap_trace_t;
49 u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
51 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
52 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
53 vxlan_encap_trace_t * t
54 = va_arg (*args, vxlan_encap_trace_t *);
56 s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
57 t->tunnel_index, t->vni);
62 #define foreach_fixed_header4_offset \
65 #define foreach_fixed_header6_offset \
66 _(0) _(1) _(2) _(3) _(4) _(5) _(6)
69 vxlan_encap_inline (vlib_main_t * vm,
70 vlib_node_runtime_t * node,
71 vlib_frame_t * from_frame,
74 u32 n_left_from, next_index, * from, * to_next;
75 vxlan_main_t * vxm = &vxlan_main;
76 vnet_main_t * vnm = vxm->vnet_main;
77 vnet_interface_main_t * im = &vnm->interface_main;
78 u32 pkts_encapsulated = 0;
79 u16 old_l0 = 0, old_l1 = 0;
80 u32 thread_index = vlib_get_thread_index();
81 u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
82 u32 sw_if_index0 = 0, sw_if_index1 = 0;
83 u32 next0 = 0, next1 = 0;
84 vnet_hw_interface_t * hi0, * hi1;
85 vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
87 from = vlib_frame_vector_args (from_frame);
88 n_left_from = from_frame->n_vectors;
90 next_index = node->cached_next_index;
91 stats_sw_if_index = node->runtime_data[0];
92 stats_n_packets = stats_n_bytes = 0;
94 while (n_left_from > 0)
98 vlib_get_next_frame (vm, node, next_index,
99 to_next, n_left_to_next);
101 while (n_left_from >= 4 && n_left_to_next >= 2)
104 vlib_buffer_t * b0, * b1;
105 u32 flow_hash0, flow_hash1;
107 ip4_header_t * ip4_0, * ip4_1;
108 ip6_header_t * ip6_0, * ip6_1;
109 udp_header_t * udp0, * udp1;
110 u64 * copy_src0, * copy_dst0;
111 u64 * copy_src1, * copy_dst1;
112 u32 * copy_src_last0, * copy_dst_last0;
113 u32 * copy_src_last1, * copy_dst_last1;
115 ip_csum_t sum0, sum1;
117 /* Prefetch next iteration. */
119 vlib_buffer_t * p2, * p3;
121 p2 = vlib_get_buffer (vm, from[2]);
122 p3 = vlib_get_buffer (vm, from[3]);
124 vlib_prefetch_buffer_header (p2, LOAD);
125 vlib_prefetch_buffer_header (p3, LOAD);
127 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
128 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
140 b0 = vlib_get_buffer (vm, bi0);
141 b1 = vlib_get_buffer (vm, bi1);
143 flow_hash0 = vnet_l2_compute_flow_hash (b0);
144 flow_hash1 = vnet_l2_compute_flow_hash (b1);
146 /* Get next node index and adj index from tunnel next_dpo */
147 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
149 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
150 hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
151 t0 = &vxm->tunnels[hi0->dev_instance];
152 /* Note: change to always set next0 if it may be set to drop */
153 next0 = t0->next_dpo.dpoi_next_node;
155 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
157 /* Get next node index and adj index from tunnel next_dpo */
158 if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX])
160 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
161 hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
162 t1 = &vxm->tunnels[hi1->dev_instance];
163 /* Note: change to always set next1 if it may be set to drop */
164 next1 = t1->next_dpo.dpoi_next_node;
166 vnet_buffer(b1)->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;
168 /* Apply the rewrite string. $$$$ vnet_rewrite? */
169 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
170 vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
174 /* IP4 VXLAN header should be 36 octects */
175 ASSERT(sizeof(ip4_vxlan_header_t) == 36);
176 ASSERT(vec_len(t0->rewrite) == sizeof(ip4_vxlan_header_t));
177 ASSERT(vec_len(t1->rewrite) == sizeof(ip4_vxlan_header_t));
179 ip4_0 = vlib_buffer_get_current(b0);
180 ip4_1 = vlib_buffer_get_current(b1);
182 /* Copy the fixed header */
183 copy_dst0 = (u64 *) ip4_0;
184 copy_src0 = (u64 *) t0->rewrite;
185 copy_dst1 = (u64 *) ip4_1;
186 copy_src1 = (u64 *) t1->rewrite;
187 /* Copy first 32 octets 8-bytes at a time */
188 #define _(offs) copy_dst0[offs] = copy_src0[offs];
189 foreach_fixed_header4_offset;
191 #define _(offs) copy_dst1[offs] = copy_src1[offs];
192 foreach_fixed_header4_offset;
194 /* Last 4 octets. Hopefully gcc will be our friend */
195 copy_dst_last0 = (u32 *)(©_dst0[4]);
196 copy_src_last0 = (u32 *)(©_src0[4]);
197 copy_dst_last0[0] = copy_src_last0[0];
198 copy_dst_last1 = (u32 *)(©_dst1[4]);
199 copy_src_last1 = (u32 *)(©_src1[4]);
200 copy_dst_last1[0] = copy_src_last1[0];
202 /* Fix the IP4 checksum and length */
203 sum0 = ip4_0->checksum;
204 new_l0 = /* old_l0 always 0, see the rewrite setup */
205 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
206 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
207 length /* changed member */);
208 ip4_0->checksum = ip_csum_fold (sum0);
209 ip4_0->length = new_l0;
210 sum1 = ip4_1->checksum;
211 new_l1 = /* old_l1 always 0, see the rewrite setup */
212 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
213 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
214 length /* changed member */);
215 ip4_1->checksum = ip_csum_fold (sum1);
216 ip4_1->length = new_l1;
218 /* Fix UDP length and set source port */
219 udp0 = (udp_header_t *)(ip4_0+1);
220 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
222 udp0->length = new_l0;
223 udp0->src_port = flow_hash0;
224 udp1 = (udp_header_t *)(ip4_1+1);
225 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
227 udp1->length = new_l1;
228 udp1->src_port = flow_hash1;
234 /* IP6 VXLAN header should be 56 octects */
235 ASSERT(sizeof(ip6_vxlan_header_t) == 56);
236 ASSERT(vec_len(t0->rewrite) == sizeof(ip6_vxlan_header_t));
237 ASSERT(vec_len(t1->rewrite) == sizeof(ip6_vxlan_header_t));
238 ip6_0 = vlib_buffer_get_current(b0);
239 ip6_1 = vlib_buffer_get_current(b1);
241 /* Copy the fixed header */
242 copy_dst0 = (u64 *) ip6_0;
243 copy_src0 = (u64 *) t0->rewrite;
244 copy_dst1 = (u64 *) ip6_1;
245 copy_src1 = (u64 *) t1->rewrite;
246 /* Copy first 56 (ip6) octets 8-bytes at a time */
247 #define _(offs) copy_dst0[offs] = copy_src0[offs];
248 foreach_fixed_header6_offset;
250 #define _(offs) copy_dst1[offs] = copy_src1[offs];
251 foreach_fixed_header6_offset;
253 /* Fix IP6 payload length */
255 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
257 ip6_0->payload_length = new_l0;
259 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
261 ip6_1->payload_length = new_l1;
263 /* Fix UDP length and set source port */
264 udp0 = (udp_header_t *)(ip6_0+1);
265 udp0->length = new_l0;
266 udp0->src_port = flow_hash0;
267 udp1 = (udp_header_t *)(ip6_1+1);
268 udp1->length = new_l1;
269 udp1->src_port = flow_hash1;
271 /* IPv6 UDP checksum is mandatory */
272 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
275 if (udp0->checksum == 0)
276 udp0->checksum = 0xffff;
277 udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1,
280 if (udp1->checksum == 0)
281 udp1->checksum = 0xffff;
284 pkts_encapsulated += 2;
285 len0 = vlib_buffer_length_in_chain (vm, b0);
286 len1 = vlib_buffer_length_in_chain (vm, b1);
287 stats_n_packets += 2;
288 stats_n_bytes += len0 + len1;
290 /* Batch stats increment on the same vxlan tunnel so counter is not
291 incremented per packet. Note stats are still incremented for deleted
292 and admin-down tunnel where packets are dropped. It is not worthwhile
293 to check for this rare case and affect normal path performance. */
294 if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
295 (sw_if_index1 != stats_sw_if_index)))
297 stats_n_packets -= 2;
298 stats_n_bytes -= len0 + len1;
299 if (sw_if_index0 == sw_if_index1)
302 vlib_increment_combined_counter
303 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
304 thread_index, stats_sw_if_index,
305 stats_n_packets, stats_n_bytes);
306 stats_sw_if_index = sw_if_index0;
308 stats_n_bytes = len0 + len1;
312 vlib_increment_combined_counter
313 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
314 thread_index, sw_if_index0, 1, len0);
315 vlib_increment_combined_counter
316 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
317 thread_index, sw_if_index1, 1, len1);
321 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
323 vxlan_encap_trace_t *tr =
324 vlib_add_trace (vm, node, b0, sizeof (*tr));
325 tr->tunnel_index = t0 - vxm->tunnels;
329 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
331 vxlan_encap_trace_t *tr =
332 vlib_add_trace (vm, node, b1, sizeof (*tr));
333 tr->tunnel_index = t1 - vxm->tunnels;
337 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
338 to_next, n_left_to_next,
339 bi0, bi1, next0, next1);
342 while (n_left_from > 0 && n_left_to_next > 0)
348 ip4_header_t * ip4_0;
349 ip6_header_t * ip6_0;
351 u64 * copy_src0, * copy_dst0;
352 u32 * copy_src_last0, * copy_dst_last0;
363 b0 = vlib_get_buffer (vm, bi0);
365 flow_hash0 = vnet_l2_compute_flow_hash(b0);
367 /* Get next node index and adj index from tunnel next_dpo */
368 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
370 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
371 hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
372 t0 = &vxm->tunnels[hi0->dev_instance];
373 /* Note: change to always set next0 if it may be set to drop */
374 next0 = t0->next_dpo.dpoi_next_node;
376 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
378 /* Apply the rewrite string. $$$$ vnet_rewrite? */
379 vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
383 /* IP4 VXLAN header should be 36 octects */
384 ASSERT(sizeof(ip4_vxlan_header_t) == 36);
385 ASSERT(vec_len(t0->rewrite) == sizeof(ip4_vxlan_header_t));
386 ip4_0 = vlib_buffer_get_current(b0);
388 /* Copy the fixed header */
389 copy_dst0 = (u64 *) ip4_0;
390 copy_src0 = (u64 *) t0->rewrite;
391 /* Copy first 32 octets 8-bytes at a time */
392 #define _(offs) copy_dst0[offs] = copy_src0[offs];
393 foreach_fixed_header4_offset;
395 /* Last 4 octets. Hopefully gcc will be our friend */
396 copy_dst_last0 = (u32 *)(©_dst0[4]);
397 copy_src_last0 = (u32 *)(©_src0[4]);
398 copy_dst_last0[0] = copy_src_last0[0];
400 /* Fix the IP4 checksum and length */
401 sum0 = ip4_0->checksum;
402 new_l0 = /* old_l0 always 0, see the rewrite setup */
403 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
404 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
405 length /* changed member */);
406 ip4_0->checksum = ip_csum_fold (sum0);
407 ip4_0->length = new_l0;
409 /* Fix UDP length and set source port */
410 udp0 = (udp_header_t *)(ip4_0+1);
411 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
413 udp0->length = new_l0;
414 udp0->src_port = flow_hash0;
421 /* IP6 VXLAN header should be 56 octects */
422 ASSERT(sizeof(ip6_vxlan_header_t) == 56);
423 ASSERT(vec_len(t0->rewrite) == sizeof(ip6_vxlan_header_t));
424 ip6_0 = vlib_buffer_get_current(b0);
425 /* Copy the fixed header */
426 copy_dst0 = (u64 *) ip6_0;
427 copy_src0 = (u64 *) t0->rewrite;
428 /* Copy first 56 (ip6) octets 8-bytes at a time */
429 #define _(offs) copy_dst0[offs] = copy_src0[offs];
430 foreach_fixed_header6_offset;
432 /* Fix IP6 payload length */
434 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
436 ip6_0->payload_length = new_l0;
438 /* Fix UDP length and set source port */
439 udp0 = (udp_header_t *)(ip6_0+1);
440 udp0->length = new_l0;
441 udp0->src_port = flow_hash0;
443 /* IPv6 UDP checksum is mandatory */
444 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
447 if (udp0->checksum == 0)
448 udp0->checksum = 0xffff;
451 pkts_encapsulated ++;
452 len0 = vlib_buffer_length_in_chain (vm, b0);
453 stats_n_packets += 1;
454 stats_n_bytes += len0;
456 /* Batch stats increment on the same vxlan tunnel so counter is not
457 incremented per packet. Note stats are still incremented for deleted
458 and admin-down tunnel where packets are dropped. It is not worthwhile
459 to check for this rare case and affect normal path performance. */
460 if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
462 stats_n_packets -= 1;
463 stats_n_bytes -= len0;
465 vlib_increment_combined_counter
466 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
467 thread_index, stats_sw_if_index,
468 stats_n_packets, stats_n_bytes);
470 stats_n_bytes = len0;
471 stats_sw_if_index = sw_if_index0;
474 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
476 vxlan_encap_trace_t *tr =
477 vlib_add_trace (vm, node, b0, sizeof (*tr));
478 tr->tunnel_index = t0 - vxm->tunnels;
481 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
482 to_next, n_left_to_next,
486 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
489 /* Do we still need this now that tunnel tx stats is kept? */
490 vlib_node_increment_counter (vm, node->node_index,
491 VXLAN_ENCAP_ERROR_ENCAPSULATED,
494 /* Increment any remaining batch stats */
497 vlib_increment_combined_counter
498 (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
499 thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
500 node->runtime_data[0] = stats_sw_if_index;
503 return from_frame->n_vectors;
507 vxlan4_encap (vlib_main_t * vm,
508 vlib_node_runtime_t * node,
509 vlib_frame_t * from_frame)
511 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
515 vxlan6_encap (vlib_main_t * vm,
516 vlib_node_runtime_t * node,
517 vlib_frame_t * from_frame)
519 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
522 VLIB_REGISTER_NODE (vxlan4_encap_node) = {
523 .function = vxlan4_encap,
524 .name = "vxlan4-encap",
525 .vector_size = sizeof (u32),
526 .format_trace = format_vxlan_encap_trace,
527 .type = VLIB_NODE_TYPE_INTERNAL,
528 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
529 .error_strings = vxlan_encap_error_strings,
530 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
532 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
536 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_encap_node, vxlan4_encap)
538 VLIB_REGISTER_NODE (vxlan6_encap_node) = {
539 .function = vxlan6_encap,
540 .name = "vxlan6-encap",
541 .vector_size = sizeof (u32),
542 .format_trace = format_vxlan_encap_trace,
543 .type = VLIB_NODE_TYPE_INTERNAL,
544 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
545 .error_strings = vxlan_encap_error_strings,
546 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
548 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
552 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)