2 * decap.c: vxlan tunnel decap packet processing
4 * Copyright (c) 2013 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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/vxlan/vxlan.h>
22 vlib_node_registration_t vxlan4_input_node;
23 vlib_node_registration_t vxlan6_input_node;
32 static u8 * format_vxlan_rx_trace (u8 * s, va_list * args)
34 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
35 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
36 vxlan_rx_trace_t * t = va_arg (*args, vxlan_rx_trace_t *);
38 if (t->tunnel_index != ~0)
40 s = format (s, "VXLAN decap from vxlan_tunnel%d vni %d next %d error %d",
41 t->tunnel_index, t->vni, t->next_index, t->error);
45 s = format (s, "VXLAN decap error - tunnel for vni %d does not exist",
52 buf_fib_index (vlib_buffer_t *b, u32 is_ip4)
54 u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
55 if (sw_if_index != (u32) ~ 0)
58 u32 * fib_index_by_sw_if_index = is_ip4 ?
59 ip4_main.fib_index_by_sw_if_index : ip6_main.fib_index_by_sw_if_index;
60 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
62 return vec_elt (fib_index_by_sw_if_index, sw_if_index);
65 typedef vxlan4_tunnel_key_t last_tunnel_cache4;
67 always_inline vxlan_tunnel_t *
68 vxlan4_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache4 * cache,
69 u32 fib_index, ip4_header_t * ip4_0, vxlan_header_t * vxlan0,
70 vxlan_tunnel_t ** stats_t0)
72 /* Make sure VXLAN tunnel exist according to packet SIP and VNI */
73 vxlan4_tunnel_key_t key4 = {
75 [0] = ip4_0->src_address.as_u32,
76 [1] = (((u64) fib_index) << 32) | vxlan0->vni_reserved,
80 if (PREDICT_FALSE (clib_bihash_key_compare_16_8 (key4.key, cache->key) == 0))
82 int rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
83 if (PREDICT_FALSE (rv != 0))
88 vxlan_tunnel_t * t0 = pool_elt_at_index (vxm->tunnels, cache->value);
90 /* Validate VXLAN tunnel SIP against packet DIP */
91 if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
96 if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address)))
99 key4.key[0] = ip4_0->dst_address.as_u32;
100 /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */
101 int rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
102 if (PREDICT_FALSE (rv != 0))
105 *stats_t0 = pool_elt_at_index (vxm->tunnels, key4.value);
111 typedef vxlan6_tunnel_key_t last_tunnel_cache6;
113 always_inline vxlan_tunnel_t *
114 vxlan6_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache6 * cache,
115 u32 fib_index, ip6_header_t * ip6_0, vxlan_header_t * vxlan0,
116 vxlan_tunnel_t ** stats_t0)
118 /* Make sure VXLAN tunnel exist according to packet SIP and VNI */
120 vxlan6_tunnel_key_t key6 = {
122 [0] = ip6_0->src_address.as_u64[0],
123 [1] = ip6_0->src_address.as_u64[1],
124 [2] = (((u64) fib_index) << 32) | vxlan0->vni_reserved,
128 if (PREDICT_FALSE (clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0))
130 int rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
131 if (PREDICT_FALSE (rv != 0))
136 vxlan_tunnel_t * t0 = pool_elt_at_index (vxm->tunnels, cache->value);
138 /* Validate VXLAN tunnel SIP against packet DIP */
139 if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6)))
144 if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address)))
147 /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */
148 key6.key[0] = ip6_0->dst_address.as_u64[0];
149 key6.key[1] = ip6_0->dst_address.as_u64[1];
150 int rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
151 if (PREDICT_FALSE (rv != 0))
154 *stats_t0 = pool_elt_at_index (vxm->tunnels, key6.value);
161 vxlan_input (vlib_main_t * vm,
162 vlib_node_runtime_t * node,
163 vlib_frame_t * from_frame,
166 vxlan_main_t * vxm = &vxlan_main;
167 vnet_main_t * vnm = vxm->vnet_main;
168 vnet_interface_main_t * im = &vnm->interface_main;
169 vlib_combined_counter_main_t * rx_counter = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
170 vlib_combined_counter_main_t * drop_counter = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
171 last_tunnel_cache4 last4;
172 last_tunnel_cache6 last6;
173 u32 pkts_decapsulated = 0;
174 u32 thread_index = vlib_get_thread_index();
177 memset (&last4, 0xff, sizeof last4);
179 memset (&last6, 0xff, sizeof last6);
181 u32 next_index = node->cached_next_index;
183 u32 * from = vlib_frame_vector_args (from_frame);
184 u32 n_left_from = from_frame->n_vectors;
186 while (n_left_from > 0)
188 u32 * to_next, n_left_to_next;
189 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
191 while (n_left_from >= 4 && n_left_to_next >= 2)
193 /* Prefetch next iteration. */
195 vlib_buffer_t * p2, * p3;
197 p2 = vlib_get_buffer (vm, from[2]);
198 p3 = vlib_get_buffer (vm, from[3]);
200 vlib_prefetch_buffer_header (p2, LOAD);
201 vlib_prefetch_buffer_header (p3, LOAD);
203 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
204 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
207 u32 bi0 = to_next[0] = from[0];
208 u32 bi1 = to_next[1] = from[1];
214 vlib_buffer_t * b0, * b1;
215 b0 = vlib_get_buffer (vm, bi0);
216 b1 = vlib_get_buffer (vm, bi1);
218 /* udp leaves current_data pointing at the vxlan header */
219 void * cur0 = vlib_buffer_get_current (b0);
220 void * cur1 = vlib_buffer_get_current (b1);
221 vxlan_header_t * vxlan0 = cur0;
222 vxlan_header_t * vxlan1 = cur1;
224 ip4_header_t * ip4_0, * ip4_1;
225 ip6_header_t * ip6_0, * ip6_1;
227 ip4_0 = cur0 - sizeof(udp_header_t) - sizeof(ip4_header_t);
228 ip4_1 = cur1 - sizeof(udp_header_t) - sizeof(ip4_header_t);
230 ip6_0 = cur0 - sizeof(udp_header_t) - sizeof(ip6_header_t);
231 ip6_1 = cur1 - sizeof(udp_header_t) - sizeof(ip6_header_t);
235 vlib_buffer_advance (b0, sizeof *vxlan0);
236 vlib_buffer_advance (b1, sizeof *vxlan1);
238 u32 fi0 = buf_fib_index(b0, is_ip4);
239 u32 fi1 = buf_fib_index(b1, is_ip4);
241 vxlan_tunnel_t * t0, * stats_t0;
242 vxlan_tunnel_t * t1, * stats_t1;
245 t0 = vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_t0);
246 t1 = vxlan4_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan1, &stats_t1);
250 t0 = vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_t0);
251 t1 = vxlan6_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan1, &stats_t1);
254 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
255 u32 len1 = vlib_buffer_length_in_chain (vm, b1);
258 u8 error0 = 0, error1 = 0;
259 /* Validate VXLAN tunnel encap-fib index agaist packet */
260 if (PREDICT_FALSE (t0 == 0 || vxlan0->flags != VXLAN_FLAGS_I))
262 next0 = VXLAN_INPUT_NEXT_DROP;
264 if (t0 != 0 && vxlan0->flags != VXLAN_FLAGS_I)
266 error0 = VXLAN_ERROR_BAD_FLAGS;
267 vlib_increment_combined_counter
268 (drop_counter, thread_index, stats_t0->sw_if_index, 1, len0);
271 error0 = VXLAN_ERROR_NO_SUCH_TUNNEL;
272 b0->error = node->errors[error0];
276 next0 = t0->decap_next_index;
278 /* Required to make the l2 tag push / pop code work on l2 subifs */
279 if (PREDICT_TRUE(next0 == VXLAN_INPUT_NEXT_L2_INPUT))
280 vnet_update_l2_len (b0);
282 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
283 vnet_buffer(b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
284 vlib_increment_combined_counter
285 (rx_counter, thread_index, stats_t0->sw_if_index, 1, len0);
289 /* Validate VXLAN tunnel encap-fib index agaist packet */
290 if (PREDICT_FALSE (t1 == 0 || vxlan1->flags != VXLAN_FLAGS_I))
292 next1 = VXLAN_INPUT_NEXT_DROP;
294 if (t1 != 0 && vxlan1->flags != VXLAN_FLAGS_I)
296 error1 = VXLAN_ERROR_BAD_FLAGS;
297 vlib_increment_combined_counter
298 (drop_counter, thread_index, stats_t1->sw_if_index, 1, len1);
301 error1 = VXLAN_ERROR_NO_SUCH_TUNNEL;
302 b1->error = node->errors[error1];
306 next1 = t1->decap_next_index;
308 /* Required to make the l2 tag push / pop code work on l2 subifs */
309 if (PREDICT_TRUE(next1 == VXLAN_INPUT_NEXT_L2_INPUT))
310 vnet_update_l2_len (b1);
312 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
313 vnet_buffer(b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;
316 vlib_increment_combined_counter
317 (rx_counter, thread_index, stats_t1->sw_if_index, 1, len1);
320 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
322 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
323 tr->next_index = next0;
325 tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
326 tr->vni = vnet_get_vni (vxlan0);
328 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
330 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr));
331 tr->next_index = next1;
333 tr->tunnel_index = t1 == 0 ? ~0 : t1 - vxm->tunnels;
334 tr->vni = vnet_get_vni (vxlan1);
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)
344 u32 bi0 = to_next[0] = from[0];
350 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
352 /* udp leaves current_data pointing at the vxlan header */
353 void * cur0 = vlib_buffer_get_current (b0);
354 vxlan_header_t * vxlan0 = cur0;
355 ip4_header_t * ip4_0;
356 ip6_header_t * ip6_0;
358 ip4_0 = cur0 -sizeof(udp_header_t) - sizeof(ip4_header_t);
360 ip6_0 = cur0 -sizeof(udp_header_t) - sizeof(ip6_header_t);
362 /* pop (ip, udp, vxlan) */
363 vlib_buffer_advance (b0, sizeof(*vxlan0));
365 u32 fi0 = buf_fib_index(b0, is_ip4);
367 vxlan_tunnel_t * t0, * stats_t0;
369 t0 = vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_t0);
371 t0 = vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_t0);
373 uword len0 = vlib_buffer_length_in_chain (vm, b0);
377 /* Validate VXLAN tunnel encap-fib index agaist packet */
378 if (PREDICT_FALSE (t0 == 0 || vxlan0->flags != VXLAN_FLAGS_I))
380 next0 = VXLAN_INPUT_NEXT_DROP;
382 if (t0 != 0 && vxlan0->flags != VXLAN_FLAGS_I)
384 error0 = VXLAN_ERROR_BAD_FLAGS;
385 vlib_increment_combined_counter
386 (drop_counter, thread_index, stats_t0->sw_if_index, 1, len0);
389 error0 = VXLAN_ERROR_NO_SUCH_TUNNEL;
390 b0->error = node->errors[error0];
394 next0 = t0->decap_next_index;
396 /* Required to make the l2 tag push / pop code work on l2 subifs */
397 if (PREDICT_TRUE(next0 == VXLAN_INPUT_NEXT_L2_INPUT))
398 vnet_update_l2_len (b0);
400 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
401 vnet_buffer(b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
404 vlib_increment_combined_counter
405 (rx_counter, thread_index, stats_t0->sw_if_index, 1, len0);
408 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
411 = vlib_add_trace (vm, node, b0, sizeof (*tr));
412 tr->next_index = next0;
414 tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
415 tr->vni = vnet_get_vni (vxlan0);
417 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
418 to_next, n_left_to_next,
422 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
424 /* Do we still need this now that tunnel tx stats is kept? */
425 u32 node_idx = is_ip4 ? vxlan4_input_node.index : vxlan6_input_node.index;
426 vlib_node_increment_counter (vm, node_idx, VXLAN_ERROR_DECAPSULATED,
429 return from_frame->n_vectors;
433 vxlan4_input (vlib_main_t * vm,
434 vlib_node_runtime_t * node,
435 vlib_frame_t * from_frame)
437 return vxlan_input(vm, node, from_frame, /* is_ip4 */ 1);
441 vxlan6_input (vlib_main_t * vm,
442 vlib_node_runtime_t * node,
443 vlib_frame_t * from_frame)
445 return vxlan_input(vm, node, from_frame, /* is_ip4 */ 0);
448 static char * vxlan_error_strings[] = {
449 #define vxlan_error(n,s) s,
450 #include <vnet/vxlan/vxlan_error.def>
455 VLIB_REGISTER_NODE (vxlan4_input_node) = {
456 .function = vxlan4_input,
457 .name = "vxlan4-input",
458 /* Takes a vector of packets. */
459 .vector_size = sizeof (u32),
461 .n_errors = VXLAN_N_ERROR,
462 .error_strings = vxlan_error_strings,
464 .n_next_nodes = VXLAN_INPUT_N_NEXT,
466 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
467 foreach_vxlan_input_next
471 //temp .format_buffer = format_vxlan_header,
472 .format_trace = format_vxlan_rx_trace,
473 // $$$$ .unformat_buffer = unformat_vxlan_header,
476 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_input_node, vxlan4_input)
478 VLIB_REGISTER_NODE (vxlan6_input_node) = {
479 .function = vxlan6_input,
480 .name = "vxlan6-input",
481 /* Takes a vector of packets. */
482 .vector_size = sizeof (u32),
484 .n_errors = VXLAN_N_ERROR,
485 .error_strings = vxlan_error_strings,
487 .n_next_nodes = VXLAN_INPUT_N_NEXT,
489 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
490 foreach_vxlan_input_next
494 //temp .format_buffer = format_vxlan_header,
495 .format_trace = format_vxlan_rx_trace,
496 // $$$$ .unformat_buffer = unformat_vxlan_header,
499 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_input_node, vxlan6_input)
503 IP_VXLAN_BYPASS_NEXT_DROP,
504 IP_VXLAN_BYPASS_NEXT_VXLAN,
505 IP_VXLAN_BYPASS_N_NEXT,
506 } ip_vxan_bypass_next_t;
509 ip_vxlan_bypass_inline (vlib_main_t * vm,
510 vlib_node_runtime_t * node,
511 vlib_frame_t * frame,
514 vxlan_main_t * vxm = &vxlan_main;
515 u32 * from, * to_next, n_left_from, n_left_to_next, next_index;
516 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index);
517 ip4_address_t addr4; /* last IPv4 address matching a local VTEP address */
518 ip6_address_t addr6; /* last IPv6 address matching a local VTEP address */
520 from = vlib_frame_vector_args (frame);
521 n_left_from = frame->n_vectors;
522 next_index = node->cached_next_index;
524 if (node->flags & VLIB_NODE_FLAG_TRACE)
525 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
527 if (is_ip4) addr4.data_u32 = ~0;
528 else ip6_address_set_zero (&addr6);
530 while (n_left_from > 0)
532 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
534 while (n_left_from >= 4 && n_left_to_next >= 2)
536 vlib_buffer_t * b0, * b1;
537 ip4_header_t * ip40, * ip41;
538 ip6_header_t * ip60, * ip61;
539 udp_header_t * udp0, * udp1;
540 u32 bi0, ip_len0, udp_len0, flags0, next0;
541 u32 bi1, ip_len1, udp_len1, flags1, next1;
542 i32 len_diff0, len_diff1;
543 u8 error0, good_udp0, proto0;
544 u8 error1, good_udp1, proto1;
546 /* Prefetch next iteration. */
548 vlib_buffer_t * p2, * p3;
550 p2 = vlib_get_buffer (vm, from[2]);
551 p3 = vlib_get_buffer (vm, from[3]);
553 vlib_prefetch_buffer_header (p2, LOAD);
554 vlib_prefetch_buffer_header (p3, LOAD);
556 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
557 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
560 bi0 = to_next[0] = from[0];
561 bi1 = to_next[1] = from[1];
567 b0 = vlib_get_buffer (vm, bi0);
568 b1 = vlib_get_buffer (vm, bi1);
571 ip40 = vlib_buffer_get_current (b0);
572 ip41 = vlib_buffer_get_current (b1);
576 ip60 = vlib_buffer_get_current (b0);
577 ip61 = vlib_buffer_get_current (b1);
580 /* Setup packet for next IP feature */
581 vnet_feature_next(vnet_buffer(b0)->sw_if_index[VLIB_RX], &next0, b0);
582 vnet_feature_next(vnet_buffer(b1)->sw_if_index[VLIB_RX], &next1, b1);
586 /* Treat IP frag packets as "experimental" protocol for now
587 until support of IP frag reassembly is implemented */
588 proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol;
589 proto1 = ip4_is_fragment(ip41) ? 0xfe : ip41->protocol;
593 proto0 = ip60->protocol;
594 proto1 = ip61->protocol;
597 /* Process packet 0 */
598 if (proto0 != IP_PROTOCOL_UDP)
599 goto exit0; /* not UDP packet */
602 udp0 = ip4_next_header (ip40);
604 udp0 = ip6_next_header (ip60);
606 if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
607 goto exit0; /* not VXLAN packet */
609 /* Validate DIP against VTEPs*/
612 if (addr4.as_u32 != ip40->dst_address.as_u32)
614 if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
615 goto exit0; /* no local VTEP for VXLAN packet */
616 addr4 = ip40->dst_address;
621 if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
623 if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
624 goto exit0; /* no local VTEP for VXLAN packet */
625 addr6 = ip60->dst_address;
630 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
632 /* Don't verify UDP checksum for packets with explicit zero checksum. */
633 good_udp0 |= udp0->checksum == 0;
635 /* Verify UDP length */
637 ip_len0 = clib_net_to_host_u16 (ip40->length);
639 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
640 udp_len0 = clib_net_to_host_u16 (udp0->length);
641 len_diff0 = ip_len0 - udp_len0;
643 /* Verify UDP checksum */
644 if (PREDICT_FALSE (!good_udp0))
646 if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
649 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
651 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
653 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
659 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
660 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
664 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
665 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
669 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
670 b0->error = error0 ? error_node->errors[error0] : 0;
672 /* vxlan-input node expect current at VXLAN header */
674 vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t));
676 vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t));
679 /* Process packet 1 */
680 if (proto1 != IP_PROTOCOL_UDP)
681 goto exit1; /* not UDP packet */
684 udp1 = ip4_next_header (ip41);
686 udp1 = ip6_next_header (ip61);
688 if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
689 goto exit1; /* not VXLAN packet */
691 /* Validate DIP against VTEPs*/
694 if (addr4.as_u32 != ip41->dst_address.as_u32)
696 if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
697 goto exit1; /* no local VTEP for VXLAN packet */
698 addr4 = ip41->dst_address;
703 if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
705 if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
706 goto exit1; /* no local VTEP for VXLAN packet */
707 addr6 = ip61->dst_address;
712 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
714 /* Don't verify UDP checksum for packets with explicit zero checksum. */
715 good_udp1 |= udp1->checksum == 0;
717 /* Verify UDP length */
719 ip_len1 = clib_net_to_host_u16 (ip41->length);
721 ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
722 udp_len1 = clib_net_to_host_u16 (udp1->length);
723 len_diff1 = ip_len1 - udp_len1;
725 /* Verify UDP checksum */
726 if (PREDICT_FALSE (!good_udp1))
728 if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
731 flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
733 flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
735 (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
741 error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
742 error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
746 error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
747 error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
751 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
752 b1->error = error1 ? error_node->errors[error1] : 0;
754 /* vxlan-input node expect current at VXLAN header */
756 vlib_buffer_advance (b1, sizeof(ip4_header_t)+sizeof(udp_header_t));
758 vlib_buffer_advance (b1, sizeof(ip6_header_t)+sizeof(udp_header_t));
761 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
762 to_next, n_left_to_next,
763 bi0, bi1, next0, next1);
766 while (n_left_from > 0 && n_left_to_next > 0)
772 u32 bi0, ip_len0, udp_len0, flags0, next0;
774 u8 error0, good_udp0, proto0;
776 bi0 = to_next[0] = from[0];
782 b0 = vlib_get_buffer (vm, bi0);
784 ip40 = vlib_buffer_get_current (b0);
786 ip60 = vlib_buffer_get_current (b0);
788 /* Setup packet for next IP feature */
789 vnet_feature_next(vnet_buffer(b0)->sw_if_index[VLIB_RX], &next0, b0);
792 /* Treat IP4 frag packets as "experimental" protocol for now
793 until support of IP frag reassembly is implemented */
794 proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol;
796 proto0 = ip60->protocol;
798 if (proto0 != IP_PROTOCOL_UDP)
799 goto exit; /* not UDP packet */
802 udp0 = ip4_next_header (ip40);
804 udp0 = ip6_next_header (ip60);
806 if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
807 goto exit; /* not VXLAN packet */
809 /* Validate DIP against VTEPs*/
812 if (addr4.as_u32 != ip40->dst_address.as_u32)
814 if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
815 goto exit; /* no local VTEP for VXLAN packet */
816 addr4 = ip40->dst_address;
821 if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
823 if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
824 goto exit; /* no local VTEP for VXLAN packet */
825 addr6 = ip60->dst_address;
830 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
832 /* Don't verify UDP checksum for packets with explicit zero checksum. */
833 good_udp0 |= udp0->checksum == 0;
835 /* Verify UDP length */
837 ip_len0 = clib_net_to_host_u16 (ip40->length);
839 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
840 udp_len0 = clib_net_to_host_u16 (udp0->length);
841 len_diff0 = ip_len0 - udp_len0;
843 /* Verify UDP checksum */
844 if (PREDICT_FALSE (!good_udp0))
846 if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
849 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
851 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
853 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
859 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
860 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
864 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
865 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
869 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
870 b0->error = error0 ? error_node->errors[error0] : 0;
872 /* vxlan-input node expect current at VXLAN header */
874 vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t));
876 vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t));
879 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
880 to_next, n_left_to_next,
884 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
887 return frame->n_vectors;
891 ip4_vxlan_bypass (vlib_main_t * vm,
892 vlib_node_runtime_t * node,
893 vlib_frame_t * frame)
895 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
898 VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) = {
899 .function = ip4_vxlan_bypass,
900 .name = "ip4-vxlan-bypass",
901 .vector_size = sizeof (u32),
903 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
905 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
906 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-input",
909 .format_buffer = format_ip4_header,
910 .format_trace = format_ip4_forward_next_trace,
913 VLIB_NODE_FUNCTION_MULTIARCH (ip4_vxlan_bypass_node,ip4_vxlan_bypass)
915 /* Dummy init function to get us linked in. */
916 clib_error_t * ip4_vxlan_bypass_init (vlib_main_t * vm)
919 VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init);
922 ip6_vxlan_bypass (vlib_main_t * vm,
923 vlib_node_runtime_t * node,
924 vlib_frame_t * frame)
926 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
929 VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) = {
930 .function = ip6_vxlan_bypass,
931 .name = "ip6-vxlan-bypass",
932 .vector_size = sizeof (u32),
934 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
936 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
937 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-input",
940 .format_buffer = format_ip6_header,
941 .format_trace = format_ip6_forward_next_trace,
944 VLIB_NODE_FUNCTION_MULTIARCH (ip6_vxlan_bypass_node,ip6_vxlan_bypass)
946 /* Dummy init function to get us linked in. */
947 clib_error_t * ip6_vxlan_bypass_init (vlib_main_t * vm)
950 VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init);
952 #define foreach_vxlan_flow_input_next \
953 _(DROP, "error-drop") \
954 _(L2_INPUT, "l2-input")
958 #define _(s,n) VXLAN_FLOW_NEXT_##s,
959 foreach_vxlan_flow_input_next
962 } vxlan_flow_input_next_t;
964 #define foreach_vxlan_flow_error \
965 _(NONE, "no error") \
966 _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \
967 _(IP_HEADER_ERROR, "Rx ip header errors") \
968 _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \
969 _(UDP_LENGTH_ERROR, "Rx udp length errors")
973 #define _(f,s) VXLAN_FLOW_ERROR_##f,
974 foreach_vxlan_flow_error
977 } vxlan_flow_error_t;
979 static char *vxlan_flow_error_strings[] = {
981 foreach_vxlan_flow_error
986 static_always_inline u8
987 vxlan_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t *b)
989 u32 flags = b->flags;
990 enum { offset = sizeof(ip4_header_t) + sizeof(udp_header_t) + sizeof(vxlan_header_t), };
992 /* Verify UDP checksum */
993 if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
995 vlib_buffer_advance (b, -offset);
996 flags = ip4_tcp_udp_validate_checksum (vm, b);
997 vlib_buffer_advance (b, offset);
1000 return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1003 static_always_inline u8
1004 vxlan_check_udp_csum (vlib_main_t * vm, vlib_buffer_t *b)
1006 ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b) - sizeof *hdr;
1007 udp_header_t * udp = &hdr->udp;
1008 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1009 u8 good_csum = (b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0 ||
1015 static_always_inline u8
1016 vxlan_check_ip (vlib_buffer_t *b, u16 payload_len)
1018 ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b) - sizeof *hdr;
1019 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1020 u16 expected = payload_len + sizeof *hdr;
1021 return ip_len > expected || hdr->ip4.ttl == 0 || hdr->ip4.ip_version_and_header_length != 0x45;
1024 static_always_inline u8
1025 vxlan_check_ip_udp_len (vlib_buffer_t *b)
1027 ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b) - sizeof *hdr;
1028 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1029 u16 udp_len = clib_net_to_host_u16 (hdr->udp.length);
1030 return udp_len > ip_len;
1033 static_always_inline u8
1034 vxlan_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0)
1036 u8 error0 = VXLAN_FLOW_ERROR_NONE;
1038 error0 = VXLAN_FLOW_ERROR_IP_HEADER_ERROR;
1040 error0 = VXLAN_FLOW_ERROR_UDP_LENGTH_ERROR;
1042 error0 = VXLAN_FLOW_ERROR_UDP_CHECKSUM_ERROR;
1046 VLIB_NODE_FN (vxlan4_flow_input_node) (vlib_main_t * vm,
1047 vlib_node_runtime_t * node,
1050 enum { payload_offset = sizeof(ip4_vxlan_header_t) };
1052 vxlan_main_t * vxm = &vxlan_main;
1053 vnet_interface_main_t * im = &vnet_main.interface_main;
1054 vlib_combined_counter_main_t * rx_counter[VXLAN_FLOW_N_NEXT] = {
1055 [VXLAN_FLOW_NEXT_DROP] = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP,
1056 [VXLAN_FLOW_NEXT_L2_INPUT] = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
1058 u32 thread_index = vlib_get_thread_index();
1060 u32 * from = vlib_frame_vector_args (f);
1061 u32 n_left_from = f->n_vectors;
1062 u32 next_index = VXLAN_FLOW_NEXT_L2_INPUT;
1064 while (n_left_from > 0)
1066 u32 n_left_to_next, *to_next;
1068 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1070 while (n_left_from > 3 && n_left_to_next > 3)
1072 u32 bi0 = to_next[0] = from[0];
1073 u32 bi1 = to_next[1] = from[1];
1074 u32 bi2 = to_next[2] = from[2];
1075 u32 bi3 = to_next[3] = from[3];
1081 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
1082 vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
1083 vlib_buffer_t * b2 = vlib_get_buffer (vm, bi2);
1084 vlib_buffer_t * b3 = vlib_get_buffer (vm, bi3);
1086 vlib_buffer_advance (b0, payload_offset);
1087 vlib_buffer_advance (b1, payload_offset);
1088 vlib_buffer_advance (b2, payload_offset);
1089 vlib_buffer_advance (b3, payload_offset);
1091 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1092 u16 len1 = vlib_buffer_length_in_chain (vm, b1);
1093 u16 len2 = vlib_buffer_length_in_chain (vm, b2);
1094 u16 len3 = vlib_buffer_length_in_chain (vm, b3);
1096 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT, next1 = VXLAN_FLOW_NEXT_L2_INPUT,
1097 next2 = VXLAN_FLOW_NEXT_L2_INPUT, next3 = VXLAN_FLOW_NEXT_L2_INPUT;
1099 u8 ip_err0 = vxlan_check_ip (b0, len0);
1100 u8 ip_err1 = vxlan_check_ip (b1, len1);
1101 u8 ip_err2 = vxlan_check_ip (b2, len2);
1102 u8 ip_err3 = vxlan_check_ip (b3, len3);
1103 u8 ip_err = ip_err0 | ip_err1 | ip_err2 | ip_err3;
1105 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1106 u8 udp_err1 = vxlan_check_ip_udp_len (b1);
1107 u8 udp_err2 = vxlan_check_ip_udp_len (b2);
1108 u8 udp_err3 = vxlan_check_ip_udp_len (b3);
1109 u8 udp_err = udp_err0 | udp_err1 | udp_err2 | udp_err3;
1111 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1112 u8 csum_err1 = vxlan_check_udp_csum (vm, b1);
1113 u8 csum_err2 = vxlan_check_udp_csum (vm, b2);
1114 u8 csum_err3 = vxlan_check_udp_csum (vm, b3);
1115 u8 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1117 if (PREDICT_FALSE(csum_err))
1120 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1122 csum_err1 = !vxlan_validate_udp_csum (vm, b1);
1124 csum_err2 = !vxlan_validate_udp_csum (vm, b2);
1126 csum_err3 = !vxlan_validate_udp_csum (vm, b3);
1127 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1130 if (PREDICT_FALSE(ip_err || udp_err || csum_err))
1132 if (ip_err0 || udp_err0 || csum_err0)
1134 next0 = VXLAN_FLOW_NEXT_DROP;
1135 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1136 b0->error = node->errors[error0];
1138 if (ip_err1 || udp_err1 || csum_err1)
1140 next1 = VXLAN_FLOW_NEXT_DROP;
1141 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1142 b1->error = node->errors[error1];
1144 if (ip_err2 || udp_err2 || csum_err2)
1146 next2 = VXLAN_FLOW_NEXT_DROP;
1147 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1148 b2->error = node->errors[error2];
1150 if (ip_err3 || udp_err3 || csum_err3)
1152 next3 = VXLAN_FLOW_NEXT_DROP;
1153 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1154 b3->error = node->errors[error3];
1158 vnet_update_l2_len (b0);
1159 vnet_update_l2_len (b1);
1160 vnet_update_l2_len (b2);
1161 vnet_update_l2_len (b3);
1163 ASSERT (b0->flow_id != 0);
1164 ASSERT (b1->flow_id != 0);
1165 ASSERT (b2->flow_id != 0);
1166 ASSERT (b3->flow_id != 0);
1168 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1169 u32 t_index1 = b1->flow_id - vxm->flow_id_start;
1170 u32 t_index2 = b2->flow_id - vxm->flow_id_start;
1171 u32 t_index3 = b3->flow_id - vxm->flow_id_start;
1173 vxlan_tunnel_t * t0 = &vxm->tunnels[t_index0];
1174 vxlan_tunnel_t * t1 = &vxm->tunnels[t_index1];
1175 vxlan_tunnel_t * t2 = &vxm->tunnels[t_index2];
1176 vxlan_tunnel_t * t3 = &vxm->tunnels[t_index3];
1178 /* flow id consumed */
1184 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
1185 u32 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;
1186 u32 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX] = t2->sw_if_index;
1187 u32 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX] = t3->sw_if_index;
1189 vlib_increment_combined_counter (rx_counter[next0], thread_index, sw_if_index0, 1, len0);
1190 vlib_increment_combined_counter (rx_counter[next1], thread_index, sw_if_index1, 1, len1);
1191 vlib_increment_combined_counter (rx_counter[next2], thread_index, sw_if_index2, 1, len2);
1192 vlib_increment_combined_counter (rx_counter[next3], thread_index, sw_if_index3, 1, len3);
1194 u32 flags = b0->flags | b1->flags | b2->flags | b3->flags;
1196 if (PREDICT_FALSE(flags & VLIB_BUFFER_IS_TRACED))
1198 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1200 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof *tr);
1201 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1202 *tr = (vxlan_rx_trace_t) {
1203 .next_index = next0, .error = error0, .tunnel_index = t_index0, .vni = t0->vni };
1205 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1207 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof *tr);
1208 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1209 *tr = (vxlan_rx_trace_t) {
1210 .next_index = next1, .error = error1, .tunnel_index = t_index1, .vni = t1->vni };
1212 if (b2->flags & VLIB_BUFFER_IS_TRACED)
1214 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b2, sizeof *tr);
1215 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1216 *tr = (vxlan_rx_trace_t) {
1217 .next_index = next2, .error = error2, .tunnel_index = t_index2, .vni = t2->vni };
1219 if (b3->flags & VLIB_BUFFER_IS_TRACED)
1221 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b3, sizeof *tr);
1222 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1223 *tr = (vxlan_rx_trace_t) {
1224 .next_index = next3, .error = error3, .tunnel_index = t_index3, .vni = t3->vni };
1227 vlib_validate_buffer_enqueue_x4
1228 (vm, node, next_index, to_next, n_left_to_next,
1229 bi0, bi1, bi2, bi3, next0, next1, next2, next3);
1231 while (n_left_from > 0 && n_left_to_next > 0)
1233 u32 bi0 = to_next[0] = from[0];
1239 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
1240 vlib_buffer_advance (b0, payload_offset);
1242 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1243 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT;
1245 u8 ip_err0 = vxlan_check_ip (b0, len0);
1246 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1247 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1250 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1251 if (ip_err0 || udp_err0 || csum_err0)
1253 next0 = VXLAN_FLOW_NEXT_DROP;
1254 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1255 b0->error = node->errors[error0];
1258 vnet_update_l2_len (b0);
1260 ASSERT (b0->flow_id != 0);
1261 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1262 vxlan_tunnel_t * t0 = &vxm->tunnels[t_index0];
1265 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
1266 vlib_increment_combined_counter (rx_counter[next0], thread_index, sw_if_index0, 1, len0);
1268 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
1270 vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof *tr);
1271 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1272 *tr = (vxlan_rx_trace_t) {
1273 .next_index = next0, .error = error0, .tunnel_index = t_index0, .vni = t0->vni };
1275 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1276 to_next, n_left_to_next,
1280 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1283 return f->n_vectors;
1287 #ifndef CLIB_MULTIARCH_VARIANT
1288 VLIB_REGISTER_NODE (vxlan4_flow_input_node) = {
1289 .name = "vxlan-flow-input",
1290 .type = VLIB_NODE_TYPE_INTERNAL,
1291 .vector_size = sizeof (u32),
1293 .format_trace = format_vxlan_rx_trace,
1295 .n_errors = VXLAN_FLOW_N_ERROR,
1296 .error_strings = vxlan_flow_error_strings,
1298 .n_next_nodes = VXLAN_FLOW_N_NEXT,
1300 #define _(s,n) [VXLAN_FLOW_NEXT_##s] = n,
1301 foreach_vxlan_flow_input_next