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;
34 format_vxlan_rx_trace (u8 * s, va_list * args)
36 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38 vxlan_rx_trace_t *t = va_arg (*args, vxlan_rx_trace_t *);
40 if (t->tunnel_index == ~0)
41 return format (s, "VXLAN decap error - tunnel for vni %d does not exist",
43 return format (s, "VXLAN decap from vxlan_tunnel%d vni %d next %d error %d",
44 t->tunnel_index, t->vni, t->next_index, t->error);
48 buf_fib_index (vlib_buffer_t * b, u32 is_ip4)
50 u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
51 if (sw_if_index != (u32) ~ 0)
54 u32 *fib_index_by_sw_if_index = is_ip4 ?
55 ip4_main.fib_index_by_sw_if_index : ip6_main.fib_index_by_sw_if_index;
56 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
58 return vec_elt (fib_index_by_sw_if_index, sw_if_index);
61 typedef vxlan4_tunnel_key_t last_tunnel_cache4;
63 always_inline vxlan_tunnel_t *
64 vxlan4_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache4 * cache,
65 u32 fib_index, ip4_header_t * ip4_0,
66 vxlan_header_t * vxlan0, vxlan_tunnel_t ** stats_t0)
68 /* Make sure VXLAN tunnel exist according to packet SIP and VNI */
69 vxlan4_tunnel_key_t key4;
70 key4.key[1] = ((u64) fib_index << 32) | vxlan0->vni_reserved;
72 if (PREDICT_FALSE (key4.key[1] != cache->key[1] ||
73 ip4_0->src_address.as_u32 != (u32) cache->key[0]))
75 key4.key[0] = ip4_0->src_address.as_u32;
77 clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
78 if (PREDICT_FALSE (rv != 0))
83 vxlan_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value);
85 /* Validate VXLAN tunnel SIP against packet DIP */
86 if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32))
91 if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address)))
94 key4.key[0] = ip4_0->dst_address.as_u32;
95 /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */
97 clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
98 if (PREDICT_FALSE (rv != 0))
101 *stats_t0 = pool_elt_at_index (vxm->tunnels, key4.value);
107 typedef vxlan6_tunnel_key_t last_tunnel_cache6;
109 always_inline vxlan_tunnel_t *
110 vxlan6_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache6 * cache,
111 u32 fib_index, ip6_header_t * ip6_0,
112 vxlan_header_t * vxlan0, vxlan_tunnel_t ** stats_t0)
114 /* Make sure VXLAN tunnel exist according to packet SIP and VNI */
115 vxlan6_tunnel_key_t key6 = {
117 [0] = ip6_0->src_address.as_u64[0],
118 [1] = ip6_0->src_address.as_u64[1],
119 [2] = (((u64) fib_index) << 32) | vxlan0->vni_reserved,
124 (clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0))
127 clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
128 if (PREDICT_FALSE (rv != 0))
133 vxlan_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value);
135 /* Validate VXLAN tunnel SIP against packet DIP */
136 if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6)))
141 if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address)))
144 /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */
145 key6.key[0] = ip6_0->dst_address.as_u64[0];
146 key6.key[1] = ip6_0->dst_address.as_u64[1];
148 clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
149 if (PREDICT_FALSE (rv != 0))
152 *stats_t0 = pool_elt_at_index (vxm->tunnels, key6.value);
159 vxlan_input (vlib_main_t * vm,
160 vlib_node_runtime_t * node,
161 vlib_frame_t * from_frame, u32 is_ip4)
163 vxlan_main_t *vxm = &vxlan_main;
164 vnet_main_t *vnm = vxm->vnet_main;
165 vnet_interface_main_t *im = &vnm->interface_main;
166 vlib_combined_counter_main_t *rx_counter =
167 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
168 vlib_combined_counter_main_t *drop_counter =
169 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
170 last_tunnel_cache4 last4;
171 last_tunnel_cache6 last6;
172 u32 pkts_decapsulated = 0;
173 u32 thread_index = vlib_get_thread_index ();
176 memset (&last4, 0xff, sizeof last4);
178 memset (&last6, 0xff, sizeof last6);
180 u32 next_index = node->cached_next_index;
182 u32 *from = vlib_frame_vector_args (from_frame);
183 u32 n_left_from = from_frame->n_vectors;
185 while (n_left_from > 0)
187 u32 *to_next, n_left_to_next;
188 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
190 while (n_left_from >= 4 && n_left_to_next >= 2)
192 /* Prefetch next iteration. */
194 vlib_buffer_t *p2, *p3;
196 p2 = vlib_get_buffer (vm, from[2]);
197 p3 = vlib_get_buffer (vm, from[3]);
199 vlib_prefetch_buffer_header (p2, LOAD);
200 vlib_prefetch_buffer_header (p3, LOAD);
202 CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
203 CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
206 u32 bi0 = to_next[0] = from[0];
207 u32 bi1 = to_next[1] = from[1];
213 vlib_buffer_t *b0, *b1;
214 b0 = vlib_get_buffer (vm, bi0);
215 b1 = vlib_get_buffer (vm, bi1);
217 /* udp leaves current_data pointing at the vxlan header */
218 void *cur0 = vlib_buffer_get_current (b0);
219 void *cur1 = vlib_buffer_get_current (b1);
220 vxlan_header_t *vxlan0 = cur0;
221 vxlan_header_t *vxlan1 = cur1;
223 ip4_header_t *ip4_0, *ip4_1;
224 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);
232 ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
233 ip6_1 = cur1 - sizeof (udp_header_t) - sizeof (ip6_header_t);
237 vlib_buffer_advance (b0, sizeof *vxlan0);
238 vlib_buffer_advance (b1, sizeof *vxlan1);
240 u32 fi0 = buf_fib_index (b0, is_ip4);
241 u32 fi1 = buf_fib_index (b1, is_ip4);
243 vxlan_tunnel_t *t0, *stats_t0;
244 vxlan_tunnel_t *t1, *stats_t1;
248 vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0,
251 vxlan4_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan1,
257 vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0,
260 vxlan6_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan1,
264 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
265 u32 len1 = vlib_buffer_length_in_chain (vm, b1);
268 u8 error0 = 0, error1 = 0;
269 /* Validate VXLAN tunnel encap-fib index agaist packet */
270 if (PREDICT_FALSE (t0 == 0 || vxlan0->flags != VXLAN_FLAGS_I))
272 next0 = VXLAN_INPUT_NEXT_DROP;
274 if (t0 != 0 && vxlan0->flags != VXLAN_FLAGS_I)
276 error0 = VXLAN_ERROR_BAD_FLAGS;
277 vlib_increment_combined_counter
278 (drop_counter, thread_index, stats_t0->sw_if_index, 1,
282 error0 = VXLAN_ERROR_NO_SUCH_TUNNEL;
283 b0->error = node->errors[error0];
287 next0 = t0->decap_next_index;
289 /* Required to make the l2 tag push / pop code work on l2 subifs */
290 if (PREDICT_TRUE (next0 == VXLAN_INPUT_NEXT_L2_INPUT))
291 vnet_update_l2_len (b0);
293 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
294 vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
295 vlib_increment_combined_counter
296 (rx_counter, thread_index, stats_t0->sw_if_index, 1, len0);
300 /* Validate VXLAN tunnel encap-fib index agaist packet */
301 if (PREDICT_FALSE (t1 == 0 || vxlan1->flags != VXLAN_FLAGS_I))
303 next1 = VXLAN_INPUT_NEXT_DROP;
305 if (t1 != 0 && vxlan1->flags != VXLAN_FLAGS_I)
307 error1 = VXLAN_ERROR_BAD_FLAGS;
308 vlib_increment_combined_counter
309 (drop_counter, thread_index, stats_t1->sw_if_index, 1,
313 error1 = VXLAN_ERROR_NO_SUCH_TUNNEL;
314 b1->error = node->errors[error1];
318 next1 = t1->decap_next_index;
320 /* Required to make the l2 tag push / pop code work on l2 subifs */
321 if (PREDICT_TRUE (next1 == VXLAN_INPUT_NEXT_L2_INPUT))
322 vnet_update_l2_len (b1);
324 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
325 vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index;
328 vlib_increment_combined_counter
329 (rx_counter, thread_index, stats_t1->sw_if_index, 1, len1);
332 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
334 vxlan_rx_trace_t *tr =
335 vlib_add_trace (vm, node, b0, sizeof (*tr));
336 tr->next_index = next0;
338 tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
339 tr->vni = vnet_get_vni (vxlan0);
341 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
343 vxlan_rx_trace_t *tr =
344 vlib_add_trace (vm, node, b1, sizeof (*tr));
345 tr->next_index = next1;
347 tr->tunnel_index = t1 == 0 ? ~0 : t1 - vxm->tunnels;
348 tr->vni = vnet_get_vni (vxlan1);
351 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
352 to_next, n_left_to_next,
353 bi0, bi1, next0, next1);
356 while (n_left_from > 0 && n_left_to_next > 0)
358 u32 bi0 = to_next[0] = from[0];
364 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
366 /* udp leaves current_data pointing at the vxlan header */
367 void *cur0 = vlib_buffer_get_current (b0);
368 vxlan_header_t *vxlan0 = cur0;
372 ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
374 ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
376 /* pop (ip, udp, vxlan) */
377 vlib_buffer_advance (b0, sizeof (*vxlan0));
379 u32 fi0 = buf_fib_index (b0, is_ip4);
381 vxlan_tunnel_t *t0, *stats_t0;
384 vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_t0);
387 vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_t0);
389 uword len0 = vlib_buffer_length_in_chain (vm, b0);
393 /* Validate VXLAN tunnel encap-fib index agaist packet */
394 if (PREDICT_FALSE (t0 == 0 || vxlan0->flags != VXLAN_FLAGS_I))
396 next0 = VXLAN_INPUT_NEXT_DROP;
398 if (t0 != 0 && vxlan0->flags != VXLAN_FLAGS_I)
400 error0 = VXLAN_ERROR_BAD_FLAGS;
401 vlib_increment_combined_counter
402 (drop_counter, thread_index, stats_t0->sw_if_index, 1,
406 error0 = VXLAN_ERROR_NO_SUCH_TUNNEL;
407 b0->error = node->errors[error0];
411 next0 = t0->decap_next_index;
413 /* Required to make the l2 tag push / pop code work on l2 subifs */
414 if (PREDICT_TRUE (next0 == VXLAN_INPUT_NEXT_L2_INPUT))
415 vnet_update_l2_len (b0);
417 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
418 vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index;
421 vlib_increment_combined_counter
422 (rx_counter, thread_index, stats_t0->sw_if_index, 1, len0);
425 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
428 = vlib_add_trace (vm, node, b0, sizeof (*tr));
429 tr->next_index = next0;
431 tr->tunnel_index = t0 == 0 ? ~0 : t0 - vxm->tunnels;
432 tr->vni = vnet_get_vni (vxlan0);
434 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
435 to_next, n_left_to_next,
439 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
441 /* Do we still need this now that tunnel tx stats is kept? */
442 u32 node_idx = is_ip4 ? vxlan4_input_node.index : vxlan6_input_node.index;
443 vlib_node_increment_counter (vm, node_idx, VXLAN_ERROR_DECAPSULATED,
446 return from_frame->n_vectors;
450 vxlan4_input (vlib_main_t * vm,
451 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
453 return vxlan_input (vm, node, from_frame, /* is_ip4 */ 1);
457 vxlan6_input (vlib_main_t * vm,
458 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
460 return vxlan_input (vm, node, from_frame, /* is_ip4 */ 0);
463 static char *vxlan_error_strings[] = {
464 #define vxlan_error(n,s) s,
465 #include <vnet/vxlan/vxlan_error.def>
471 VLIB_REGISTER_NODE (vxlan4_input_node) =
473 .function = vxlan4_input,
474 .name = "vxlan4-input",
475 .vector_size = sizeof (u32),
476 .n_errors = VXLAN_N_ERROR,
477 .error_strings = vxlan_error_strings,
478 .n_next_nodes = VXLAN_INPUT_N_NEXT,
479 .format_trace = format_vxlan_rx_trace,
481 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
482 foreach_vxlan_input_next
486 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_input_node, vxlan4_input)
488 VLIB_REGISTER_NODE (vxlan6_input_node) =
490 .function = vxlan6_input,
491 .name = "vxlan6-input",
492 .vector_size = sizeof (u32),
493 .n_errors = VXLAN_N_ERROR,
494 .error_strings = vxlan_error_strings,
495 .n_next_nodes = VXLAN_INPUT_N_NEXT,
497 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
498 foreach_vxlan_input_next
501 .format_trace = format_vxlan_rx_trace,
503 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_input_node, vxlan6_input)
508 IP_VXLAN_BYPASS_NEXT_DROP,
509 IP_VXLAN_BYPASS_NEXT_VXLAN,
510 IP_VXLAN_BYPASS_N_NEXT,
511 } ip_vxan_bypass_next_t;
514 ip_vxlan_bypass_inline (vlib_main_t * vm,
515 vlib_node_runtime_t * node,
516 vlib_frame_t * frame, u32 is_ip4)
518 vxlan_main_t *vxm = &vxlan_main;
519 u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
520 vlib_node_runtime_t *error_node =
521 vlib_node_get_runtime (vm, ip4_input_node.index);
522 ip4_address_t addr4; /* last IPv4 address matching a local VTEP address */
523 ip6_address_t addr6; /* last IPv6 address matching a local VTEP address */
525 from = vlib_frame_vector_args (frame);
526 n_left_from = frame->n_vectors;
527 next_index = node->cached_next_index;
529 if (node->flags & VLIB_NODE_FLAG_TRACE)
530 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
535 ip6_address_set_zero (&addr6);
537 while (n_left_from > 0)
539 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
541 while (n_left_from >= 4 && n_left_to_next >= 2)
543 vlib_buffer_t *b0, *b1;
544 ip4_header_t *ip40, *ip41;
545 ip6_header_t *ip60, *ip61;
546 udp_header_t *udp0, *udp1;
547 u32 bi0, ip_len0, udp_len0, flags0, next0;
548 u32 bi1, ip_len1, udp_len1, flags1, next1;
549 i32 len_diff0, len_diff1;
550 u8 error0, good_udp0, proto0;
551 u8 error1, good_udp1, proto1;
553 /* Prefetch next iteration. */
555 vlib_buffer_t *p2, *p3;
557 p2 = vlib_get_buffer (vm, from[2]);
558 p3 = vlib_get_buffer (vm, from[3]);
560 vlib_prefetch_buffer_header (p2, LOAD);
561 vlib_prefetch_buffer_header (p3, LOAD);
563 CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
564 CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
567 bi0 = to_next[0] = from[0];
568 bi1 = to_next[1] = from[1];
574 b0 = vlib_get_buffer (vm, bi0);
575 b1 = vlib_get_buffer (vm, bi1);
578 ip40 = vlib_buffer_get_current (b0);
579 ip41 = vlib_buffer_get_current (b1);
583 ip60 = vlib_buffer_get_current (b0);
584 ip61 = vlib_buffer_get_current (b1);
587 /* Setup packet for next IP feature */
588 vnet_feature_next (&next0, b0);
589 vnet_feature_next (&next1, b1);
593 /* Treat IP frag packets as "experimental" protocol for now
594 until support of IP frag reassembly is implemented */
595 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
596 proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
600 proto0 = ip60->protocol;
601 proto1 = ip61->protocol;
604 /* Process packet 0 */
605 if (proto0 != IP_PROTOCOL_UDP)
606 goto exit0; /* not UDP packet */
609 udp0 = ip4_next_header (ip40);
611 udp0 = ip6_next_header (ip60);
613 if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
614 goto exit0; /* not VXLAN packet */
616 /* Validate DIP against VTEPs */
619 if (addr4.as_u32 != ip40->dst_address.as_u32)
621 if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
622 goto exit0; /* no local VTEP for VXLAN packet */
623 addr4 = ip40->dst_address;
628 if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
630 if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
631 goto exit0; /* no local VTEP for VXLAN packet */
632 addr6 = ip60->dst_address;
637 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
639 /* Don't verify UDP checksum for packets with explicit zero checksum. */
640 good_udp0 |= udp0->checksum == 0;
642 /* Verify UDP length */
644 ip_len0 = clib_net_to_host_u16 (ip40->length);
646 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
647 udp_len0 = clib_net_to_host_u16 (udp0->length);
648 len_diff0 = ip_len0 - udp_len0;
650 /* Verify UDP checksum */
651 if (PREDICT_FALSE (!good_udp0))
653 if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
656 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
658 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
660 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
666 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
667 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
671 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
672 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
676 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
677 b0->error = error0 ? error_node->errors[error0] : 0;
679 /* vxlan-input node expect current at VXLAN header */
681 vlib_buffer_advance (b0,
682 sizeof (ip4_header_t) +
683 sizeof (udp_header_t));
685 vlib_buffer_advance (b0,
686 sizeof (ip6_header_t) +
687 sizeof (udp_header_t));
690 /* Process packet 1 */
691 if (proto1 != IP_PROTOCOL_UDP)
692 goto exit1; /* not UDP packet */
695 udp1 = ip4_next_header (ip41);
697 udp1 = ip6_next_header (ip61);
699 if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
700 goto exit1; /* not VXLAN packet */
702 /* Validate DIP against VTEPs */
705 if (addr4.as_u32 != ip41->dst_address.as_u32)
707 if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32))
708 goto exit1; /* no local VTEP for VXLAN packet */
709 addr4 = ip41->dst_address;
714 if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
716 if (!hash_get_mem (vxm->vtep6, &ip61->dst_address))
717 goto exit1; /* no local VTEP for VXLAN packet */
718 addr6 = ip61->dst_address;
723 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
725 /* Don't verify UDP checksum for packets with explicit zero checksum. */
726 good_udp1 |= udp1->checksum == 0;
728 /* Verify UDP length */
730 ip_len1 = clib_net_to_host_u16 (ip41->length);
732 ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
733 udp_len1 = clib_net_to_host_u16 (udp1->length);
734 len_diff1 = ip_len1 - udp_len1;
736 /* Verify UDP checksum */
737 if (PREDICT_FALSE (!good_udp1))
739 if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
742 flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
744 flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
746 (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
752 error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
753 error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
757 error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
758 error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
762 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
763 b1->error = error1 ? error_node->errors[error1] : 0;
765 /* vxlan-input node expect current at VXLAN header */
767 vlib_buffer_advance (b1,
768 sizeof (ip4_header_t) +
769 sizeof (udp_header_t));
771 vlib_buffer_advance (b1,
772 sizeof (ip6_header_t) +
773 sizeof (udp_header_t));
776 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
777 to_next, n_left_to_next,
778 bi0, bi1, next0, next1);
781 while (n_left_from > 0 && n_left_to_next > 0)
787 u32 bi0, ip_len0, udp_len0, flags0, next0;
789 u8 error0, good_udp0, proto0;
791 bi0 = to_next[0] = from[0];
797 b0 = vlib_get_buffer (vm, bi0);
799 ip40 = vlib_buffer_get_current (b0);
801 ip60 = vlib_buffer_get_current (b0);
803 /* Setup packet for next IP feature */
804 vnet_feature_next (&next0, b0);
807 /* Treat IP4 frag packets as "experimental" protocol for now
808 until support of IP frag reassembly is implemented */
809 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
811 proto0 = ip60->protocol;
813 if (proto0 != IP_PROTOCOL_UDP)
814 goto exit; /* not UDP packet */
817 udp0 = ip4_next_header (ip40);
819 udp0 = ip6_next_header (ip60);
821 if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan))
822 goto exit; /* not VXLAN packet */
824 /* Validate DIP against VTEPs */
827 if (addr4.as_u32 != ip40->dst_address.as_u32)
829 if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32))
830 goto exit; /* no local VTEP for VXLAN packet */
831 addr4 = ip40->dst_address;
836 if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
838 if (!hash_get_mem (vxm->vtep6, &ip60->dst_address))
839 goto exit; /* no local VTEP for VXLAN packet */
840 addr6 = ip60->dst_address;
845 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
847 /* Don't verify UDP checksum for packets with explicit zero checksum. */
848 good_udp0 |= udp0->checksum == 0;
850 /* Verify UDP length */
852 ip_len0 = clib_net_to_host_u16 (ip40->length);
854 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
855 udp_len0 = clib_net_to_host_u16 (udp0->length);
856 len_diff0 = ip_len0 - udp_len0;
858 /* Verify UDP checksum */
859 if (PREDICT_FALSE (!good_udp0))
861 if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
864 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
866 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
868 (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
874 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
875 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
879 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
880 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
884 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
885 b0->error = error0 ? error_node->errors[error0] : 0;
887 /* vxlan-input node expect current at VXLAN header */
889 vlib_buffer_advance (b0,
890 sizeof (ip4_header_t) +
891 sizeof (udp_header_t));
893 vlib_buffer_advance (b0,
894 sizeof (ip6_header_t) +
895 sizeof (udp_header_t));
898 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
899 to_next, n_left_to_next,
903 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
906 return frame->n_vectors;
910 ip4_vxlan_bypass (vlib_main_t * vm,
911 vlib_node_runtime_t * node, vlib_frame_t * frame)
913 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
917 VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) =
919 .function = ip4_vxlan_bypass,
920 .name = "ip4-vxlan-bypass",
921 .vector_size = sizeof (u32),
922 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
924 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
925 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-input",
927 .format_buffer = format_ip4_header,
928 .format_trace = format_ip4_forward_next_trace,
931 VLIB_NODE_FUNCTION_MULTIARCH (ip4_vxlan_bypass_node, ip4_vxlan_bypass)
934 /* Dummy init function to get us linked in. */
936 ip4_vxlan_bypass_init (vlib_main_t * vm)
941 VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init);
944 ip6_vxlan_bypass (vlib_main_t * vm,
945 vlib_node_runtime_t * node, vlib_frame_t * frame)
947 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
951 VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) =
953 .function = ip6_vxlan_bypass,
954 .name = "ip6-vxlan-bypass",
955 .vector_size = sizeof (u32),
956 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
958 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
959 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-input",
961 .format_buffer = format_ip6_header,
962 .format_trace = format_ip6_forward_next_trace,
965 VLIB_NODE_FUNCTION_MULTIARCH (ip6_vxlan_bypass_node, ip6_vxlan_bypass)
968 /* Dummy init function to get us linked in. */
970 ip6_vxlan_bypass_init (vlib_main_t * vm)
975 VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init);
977 #define foreach_vxlan_flow_input_next \
978 _(DROP, "error-drop") \
979 _(L2_INPUT, "l2-input")
983 #define _(s,n) VXLAN_FLOW_NEXT_##s,
984 foreach_vxlan_flow_input_next
987 } vxlan_flow_input_next_t;
989 #define foreach_vxlan_flow_error \
990 _(NONE, "no error") \
991 _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \
992 _(IP_HEADER_ERROR, "Rx ip header errors") \
993 _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \
994 _(UDP_LENGTH_ERROR, "Rx udp length errors")
998 #define _(f,s) VXLAN_FLOW_ERROR_##f,
999 foreach_vxlan_flow_error
1002 } vxlan_flow_error_t;
1004 static char *vxlan_flow_error_strings[] = {
1006 foreach_vxlan_flow_error
1011 static_always_inline u8
1012 vxlan_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
1014 u32 flags = b->flags;
1017 sizeof (ip4_header_t) + sizeof (udp_header_t) + sizeof (vxlan_header_t),
1020 /* Verify UDP checksum */
1021 if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
1023 vlib_buffer_advance (b, -offset);
1024 flags = ip4_tcp_udp_validate_checksum (vm, b);
1025 vlib_buffer_advance (b, offset);
1028 return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
1031 static_always_inline u8
1032 vxlan_check_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
1034 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1035 udp_header_t *udp = &hdr->udp;
1036 /* Don't verify UDP checksum for packets with explicit zero checksum. */
1037 u8 good_csum = (b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0 ||
1043 static_always_inline u8
1044 vxlan_check_ip (vlib_buffer_t * b, u16 payload_len)
1046 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1047 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1048 u16 expected = payload_len + sizeof *hdr;
1049 return ip_len > expected || hdr->ip4.ttl == 0
1050 || hdr->ip4.ip_version_and_header_length != 0x45;
1053 static_always_inline u8
1054 vxlan_check_ip_udp_len (vlib_buffer_t * b)
1056 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1057 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1058 u16 udp_len = clib_net_to_host_u16 (hdr->udp.length);
1059 return udp_len > ip_len;
1062 static_always_inline u8
1063 vxlan_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0)
1065 u8 error0 = VXLAN_FLOW_ERROR_NONE;
1067 error0 = VXLAN_FLOW_ERROR_IP_HEADER_ERROR;
1069 error0 = VXLAN_FLOW_ERROR_UDP_LENGTH_ERROR;
1071 error0 = VXLAN_FLOW_ERROR_UDP_CHECKSUM_ERROR;
1075 VLIB_NODE_FN (vxlan4_flow_input_node) (vlib_main_t * vm,
1076 vlib_node_runtime_t * node,
1080 { payload_offset = sizeof (ip4_vxlan_header_t) };
1082 vxlan_main_t *vxm = &vxlan_main;
1083 vnet_interface_main_t *im = &vnet_main.interface_main;
1084 vlib_combined_counter_main_t *rx_counter[VXLAN_FLOW_N_NEXT] = {
1085 [VXLAN_FLOW_NEXT_DROP] =
1086 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP,
1087 [VXLAN_FLOW_NEXT_L2_INPUT] =
1088 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
1090 u32 thread_index = vlib_get_thread_index ();
1092 u32 *from = vlib_frame_vector_args (f);
1093 u32 n_left_from = f->n_vectors;
1094 u32 next_index = VXLAN_FLOW_NEXT_L2_INPUT;
1096 while (n_left_from > 0)
1098 u32 n_left_to_next, *to_next;
1100 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1102 while (n_left_from > 3 && n_left_to_next > 3)
1104 u32 bi0 = to_next[0] = from[0];
1105 u32 bi1 = to_next[1] = from[1];
1106 u32 bi2 = to_next[2] = from[2];
1107 u32 bi3 = to_next[3] = from[3];
1111 n_left_to_next -= 4;
1113 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1114 vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);
1115 vlib_buffer_t *b2 = vlib_get_buffer (vm, bi2);
1116 vlib_buffer_t *b3 = vlib_get_buffer (vm, bi3);
1118 vlib_buffer_advance (b0, payload_offset);
1119 vlib_buffer_advance (b1, payload_offset);
1120 vlib_buffer_advance (b2, payload_offset);
1121 vlib_buffer_advance (b3, payload_offset);
1123 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1124 u16 len1 = vlib_buffer_length_in_chain (vm, b1);
1125 u16 len2 = vlib_buffer_length_in_chain (vm, b2);
1126 u16 len3 = vlib_buffer_length_in_chain (vm, b3);
1128 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT, next1 =
1129 VXLAN_FLOW_NEXT_L2_INPUT, next2 =
1130 VXLAN_FLOW_NEXT_L2_INPUT, next3 = VXLAN_FLOW_NEXT_L2_INPUT;
1132 u8 ip_err0 = vxlan_check_ip (b0, len0);
1133 u8 ip_err1 = vxlan_check_ip (b1, len1);
1134 u8 ip_err2 = vxlan_check_ip (b2, len2);
1135 u8 ip_err3 = vxlan_check_ip (b3, len3);
1136 u8 ip_err = ip_err0 | ip_err1 | ip_err2 | ip_err3;
1138 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1139 u8 udp_err1 = vxlan_check_ip_udp_len (b1);
1140 u8 udp_err2 = vxlan_check_ip_udp_len (b2);
1141 u8 udp_err3 = vxlan_check_ip_udp_len (b3);
1142 u8 udp_err = udp_err0 | udp_err1 | udp_err2 | udp_err3;
1144 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1145 u8 csum_err1 = vxlan_check_udp_csum (vm, b1);
1146 u8 csum_err2 = vxlan_check_udp_csum (vm, b2);
1147 u8 csum_err3 = vxlan_check_udp_csum (vm, b3);
1148 u8 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1150 if (PREDICT_FALSE (csum_err))
1153 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1155 csum_err1 = !vxlan_validate_udp_csum (vm, b1);
1157 csum_err2 = !vxlan_validate_udp_csum (vm, b2);
1159 csum_err3 = !vxlan_validate_udp_csum (vm, b3);
1160 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1163 if (PREDICT_FALSE (ip_err || udp_err || csum_err))
1165 if (ip_err0 || udp_err0 || csum_err0)
1167 next0 = VXLAN_FLOW_NEXT_DROP;
1168 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1169 b0->error = node->errors[error0];
1171 if (ip_err1 || udp_err1 || csum_err1)
1173 next1 = VXLAN_FLOW_NEXT_DROP;
1174 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1175 b1->error = node->errors[error1];
1177 if (ip_err2 || udp_err2 || csum_err2)
1179 next2 = VXLAN_FLOW_NEXT_DROP;
1180 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1181 b2->error = node->errors[error2];
1183 if (ip_err3 || udp_err3 || csum_err3)
1185 next3 = VXLAN_FLOW_NEXT_DROP;
1186 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1187 b3->error = node->errors[error3];
1191 vnet_update_l2_len (b0);
1192 vnet_update_l2_len (b1);
1193 vnet_update_l2_len (b2);
1194 vnet_update_l2_len (b3);
1196 ASSERT (b0->flow_id != 0);
1197 ASSERT (b1->flow_id != 0);
1198 ASSERT (b2->flow_id != 0);
1199 ASSERT (b3->flow_id != 0);
1201 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1202 u32 t_index1 = b1->flow_id - vxm->flow_id_start;
1203 u32 t_index2 = b2->flow_id - vxm->flow_id_start;
1204 u32 t_index3 = b3->flow_id - vxm->flow_id_start;
1206 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1207 vxlan_tunnel_t *t1 = &vxm->tunnels[t_index1];
1208 vxlan_tunnel_t *t2 = &vxm->tunnels[t_index2];
1209 vxlan_tunnel_t *t3 = &vxm->tunnels[t_index3];
1211 /* flow id consumed */
1217 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1219 u32 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX] =
1221 u32 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX] =
1223 u32 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX] =
1226 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1227 sw_if_index0, 1, len0);
1228 vlib_increment_combined_counter (rx_counter[next1], thread_index,
1229 sw_if_index1, 1, len1);
1230 vlib_increment_combined_counter (rx_counter[next2], thread_index,
1231 sw_if_index2, 1, len2);
1232 vlib_increment_combined_counter (rx_counter[next3], thread_index,
1233 sw_if_index3, 1, len3);
1235 u32 flags = b0->flags | b1->flags | b2->flags | b3->flags;
1237 if (PREDICT_FALSE (flags & VLIB_BUFFER_IS_TRACED))
1239 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1241 vxlan_rx_trace_t *tr =
1242 vlib_add_trace (vm, node, b0, sizeof *tr);
1243 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1244 tr->next_index = next0;
1246 tr->tunnel_index = t_index0;
1249 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1251 vxlan_rx_trace_t *tr =
1252 vlib_add_trace (vm, node, b1, sizeof *tr);
1253 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1254 tr->next_index = next1;
1256 tr->tunnel_index = t_index1;
1259 if (b2->flags & VLIB_BUFFER_IS_TRACED)
1261 vxlan_rx_trace_t *tr =
1262 vlib_add_trace (vm, node, b2, sizeof *tr);
1263 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1264 tr->next_index = next2;
1266 tr->tunnel_index = t_index2;
1269 if (b3->flags & VLIB_BUFFER_IS_TRACED)
1271 vxlan_rx_trace_t *tr =
1272 vlib_add_trace (vm, node, b3, sizeof *tr);
1273 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1274 tr->next_index = next3;
1276 tr->tunnel_index = t_index3;
1280 vlib_validate_buffer_enqueue_x4
1281 (vm, node, next_index, to_next, n_left_to_next,
1282 bi0, bi1, bi2, bi3, next0, next1, next2, next3);
1284 while (n_left_from > 0 && n_left_to_next > 0)
1286 u32 bi0 = to_next[0] = from[0];
1292 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1293 vlib_buffer_advance (b0, payload_offset);
1295 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1296 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT;
1298 u8 ip_err0 = vxlan_check_ip (b0, len0);
1299 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1300 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1303 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1304 if (ip_err0 || udp_err0 || csum_err0)
1306 next0 = VXLAN_FLOW_NEXT_DROP;
1307 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1308 b0->error = node->errors[error0];
1311 vnet_update_l2_len (b0);
1313 ASSERT (b0->flow_id != 0);
1314 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1315 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1318 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1320 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1321 sw_if_index0, 1, len0);
1323 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1325 vxlan_rx_trace_t *tr =
1326 vlib_add_trace (vm, node, b0, sizeof *tr);
1327 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1328 tr->next_index = next0;
1330 tr->tunnel_index = t_index0;
1333 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1334 to_next, n_left_to_next,
1338 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1341 return f->n_vectors;
1345 #ifndef CLIB_MULTIARCH_VARIANT
1346 VLIB_REGISTER_NODE (vxlan4_flow_input_node) = {
1347 .name = "vxlan-flow-input",
1348 .type = VLIB_NODE_TYPE_INTERNAL,
1349 .vector_size = sizeof (u32),
1351 .format_trace = format_vxlan_rx_trace,
1353 .n_errors = VXLAN_FLOW_N_ERROR,
1354 .error_strings = vxlan_flow_error_strings,
1356 .n_next_nodes = VXLAN_FLOW_N_NEXT,
1358 #define _(s,n) [VXLAN_FLOW_NEXT_##s] = n,
1359 foreach_vxlan_flow_input_next
1367 * fd.io coding-style-patch-verification: ON
1370 * eval: (c-set-style "gnu")