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 <vxlan/vxlan.h>
20 #include <vnet/udp/udp_local.h>
22 #ifndef CLIB_MARCH_VARIANT
23 __clib_export vlib_node_registration_t vxlan4_input_node;
24 __clib_export vlib_node_registration_t vxlan6_input_node;
36 format_vxlan_rx_trace (u8 * s, va_list * args)
38 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
39 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
40 vxlan_rx_trace_t *t = va_arg (*args, vxlan_rx_trace_t *);
42 if (t->tunnel_index == ~0)
43 return format (s, "VXLAN decap error - tunnel for vni %d does not exist",
45 return format (s, "VXLAN decap from vxlan_tunnel%d vni %d next %d error %d",
46 t->tunnel_index, t->vni, t->next_index, t->error);
49 typedef vxlan4_tunnel_key_t last_tunnel_cache4;
51 static const vxlan_decap_info_t decap_not_found = {
53 .next_index = VXLAN_INPUT_NEXT_DROP,
54 .error = VXLAN_ERROR_NO_SUCH_TUNNEL
57 static const vxlan_decap_info_t decap_bad_flags = {
59 .next_index = VXLAN_INPUT_NEXT_DROP,
60 .error = VXLAN_ERROR_BAD_FLAGS
63 always_inline vxlan_decap_info_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, u32 * stats_sw_if_index)
68 if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I))
69 return decap_bad_flags;
71 /* Make sure VXLAN tunnel exist according to packet S/D IP, UDP port, VRF,
73 u32 dst = ip4_0->dst_address.as_u32;
74 u32 src = ip4_0->src_address.as_u32;
75 udp_header_t *udp = ip4_next_header (ip4_0);
76 vxlan4_tunnel_key_t key4 = {
77 .key[0] = ((u64) dst << 32) | src,
78 .key[1] = ((u64) udp->dst_port << 48) | ((u64) fib_index << 32) |
83 (key4.key[0] == cache->key[0] && key4.key[1] == cache->key[1]))
86 vxlan_decap_info_t di = {.as_u64 = cache->value };
87 *stats_sw_if_index = di.sw_if_index;
91 int rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
92 if (PREDICT_TRUE (rv == 0))
95 vxlan_decap_info_t di = {.as_u64 = key4.value };
96 *stats_sw_if_index = di.sw_if_index;
101 if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address)))
102 return decap_not_found;
104 /* search for mcast decap info by mcast address */
106 rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
108 return decap_not_found;
110 /* search for unicast tunnel using the mcast tunnel local(src) ip */
111 vxlan_decap_info_t mdi = {.as_u64 = key4.value };
112 key4.key[0] = ((u64) mdi.local_ip.as_u32 << 32) | src;
113 rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
114 if (PREDICT_FALSE (rv != 0))
115 return decap_not_found;
117 /* mcast traffic does not update the cache */
118 *stats_sw_if_index = mdi.sw_if_index;
119 vxlan_decap_info_t di = {.as_u64 = key4.value };
123 typedef vxlan6_tunnel_key_t last_tunnel_cache6;
125 always_inline vxlan_decap_info_t
126 vxlan6_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache6 * cache,
127 u32 fib_index, ip6_header_t * ip6_0,
128 vxlan_header_t * vxlan0, u32 * stats_sw_if_index)
130 if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I))
131 return decap_bad_flags;
133 /* Make sure VXLAN tunnel exist according to packet SIP, UDP port, VRF, and
135 udp_header_t *udp = ip6_next_header (ip6_0);
136 vxlan6_tunnel_key_t key6 = {
137 .key[0] = ip6_0->src_address.as_u64[0],
138 .key[1] = ip6_0->src_address.as_u64[1],
139 .key[2] = ((u64) udp->dst_port << 48) | ((u64) fib_index << 32) |
140 vxlan0->vni_reserved,
144 (clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0))
147 clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
148 if (PREDICT_FALSE (rv != 0))
149 return decap_not_found;
153 vxlan_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value);
155 /* Validate VXLAN tunnel SIP against packet DIP */
156 if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6)))
157 *stats_sw_if_index = t0->sw_if_index;
161 if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address)))
162 return decap_not_found;
164 /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */
165 key6.key[0] = ip6_0->dst_address.as_u64[0];
166 key6.key[1] = ip6_0->dst_address.as_u64[1];
168 clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
169 if (PREDICT_FALSE (rv != 0))
170 return decap_not_found;
172 vxlan_tunnel_t *mcast_t0 = pool_elt_at_index (vxm->tunnels, key6.value);
173 *stats_sw_if_index = mcast_t0->sw_if_index;
176 vxlan_decap_info_t di = {
177 .sw_if_index = t0->sw_if_index,
178 .next_index = t0->decap_next_index,
184 vxlan_input (vlib_main_t * vm,
185 vlib_node_runtime_t * node,
186 vlib_frame_t * from_frame, u32 is_ip4)
188 vxlan_main_t *vxm = &vxlan_main;
189 vnet_main_t *vnm = vxm->vnet_main;
190 vnet_interface_main_t *im = &vnm->interface_main;
191 vlib_combined_counter_main_t *rx_counter =
192 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
193 last_tunnel_cache4 last4;
194 last_tunnel_cache6 last6;
195 u32 pkts_dropped = 0;
196 u32 thread_index = vlib_get_thread_index ();
199 clib_memset (&last4, 0xff, sizeof last4);
201 clib_memset (&last6, 0xff, sizeof last6);
203 u32 *from = vlib_frame_vector_args (from_frame);
204 u32 n_left_from = from_frame->n_vectors;
206 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
207 vlib_get_buffers (vm, from, bufs, n_left_from);
209 u32 stats_if0 = ~0, stats_if1 = ~0;
210 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
211 while (n_left_from >= 4)
213 /* Prefetch next iteration. */
214 vlib_prefetch_buffer_header (b[2], LOAD);
215 vlib_prefetch_buffer_header (b[3], LOAD);
217 /* udp leaves current_data pointing at the vxlan header */
218 void *cur0 = vlib_buffer_get_current (b[0]);
219 void *cur1 = vlib_buffer_get_current (b[1]);
220 vxlan_header_t *vxlan0 = cur0;
221 vxlan_header_t *vxlan1 = cur1;
224 ip4_header_t *ip4_0, *ip4_1;
225 ip6_header_t *ip6_0, *ip6_1;
228 ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
229 ip4_1 = cur1 - sizeof (udp_header_t) - sizeof (ip4_header_t);
233 ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
234 ip6_1 = cur1 - sizeof (udp_header_t) - sizeof (ip6_header_t);
238 vlib_buffer_advance (b[0], sizeof *vxlan0);
239 vlib_buffer_advance (b[1], sizeof *vxlan1);
241 u32 fi0 = vlib_buffer_get_ip_fib_index (b[0], is_ip4);
242 u32 fi1 = vlib_buffer_get_ip_fib_index (b[1], is_ip4);
244 vxlan_decap_info_t di0 = is_ip4 ?
245 vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_if0) :
246 vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_if0);
247 vxlan_decap_info_t di1 = is_ip4 ?
248 vxlan4_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan1, &stats_if1) :
249 vxlan6_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan1, &stats_if1);
251 /* Prefetch next iteration. */
252 clib_prefetch_load (b[2]->data);
253 clib_prefetch_load (b[3]->data);
255 u32 len0 = vlib_buffer_length_in_chain (vm, b[0]);
256 u32 len1 = vlib_buffer_length_in_chain (vm, b[1]);
258 next[0] = di0.next_index;
259 next[1] = di1.next_index;
261 u8 any_error = di0.error | di1.error;
262 if (PREDICT_TRUE (any_error == 0))
264 /* Required to make the l2 tag push / pop code work on l2 subifs */
265 vnet_update_l2_len (b[0]);
266 vnet_update_l2_len (b[1]);
267 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
268 vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index;
269 vnet_buffer (b[1])->sw_if_index[VLIB_RX] = di1.sw_if_index;
270 vlib_increment_combined_counter (rx_counter, thread_index,
272 vlib_increment_combined_counter (rx_counter, thread_index,
279 vnet_update_l2_len (b[0]);
280 vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index;
281 vlib_increment_combined_counter (rx_counter, thread_index,
286 b[0]->error = node->errors[di0.error];
292 vnet_update_l2_len (b[1]);
293 vnet_buffer (b[1])->sw_if_index[VLIB_RX] = di1.sw_if_index;
294 vlib_increment_combined_counter (rx_counter, thread_index,
299 b[1]->error = node->errors[di1.error];
304 if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
306 vxlan_rx_trace_t *tr =
307 vlib_add_trace (vm, node, b[0], sizeof (*tr));
308 tr->next_index = next[0];
309 tr->error = di0.error;
310 tr->tunnel_index = di0.sw_if_index == ~0 ?
311 ~0 : vxm->tunnel_index_by_sw_if_index[di0.sw_if_index];
312 tr->vni = vnet_get_vni (vxlan0);
314 if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
316 vxlan_rx_trace_t *tr =
317 vlib_add_trace (vm, node, b[1], sizeof (*tr));
318 tr->next_index = next[1];
319 tr->error = di1.error;
320 tr->tunnel_index = di1.sw_if_index == ~0 ?
321 ~0 : vxm->tunnel_index_by_sw_if_index[di1.sw_if_index];
322 tr->vni = vnet_get_vni (vxlan1);
329 while (n_left_from > 0)
331 /* udp leaves current_data pointing at the vxlan header */
332 void *cur0 = vlib_buffer_get_current (b[0]);
333 vxlan_header_t *vxlan0 = cur0;
337 ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t);
339 ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t);
341 /* pop (ip, udp, vxlan) */
342 vlib_buffer_advance (b[0], sizeof (*vxlan0));
344 u32 fi0 = vlib_buffer_get_ip_fib_index (b[0], is_ip4);
346 vxlan_decap_info_t di0 = is_ip4 ?
347 vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_if0) :
348 vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_if0);
350 uword len0 = vlib_buffer_length_in_chain (vm, b[0]);
352 next[0] = di0.next_index;
354 /* Validate VXLAN tunnel encap-fib index against packet */
357 /* Required to make the l2 tag push / pop code work on l2 subifs */
358 vnet_update_l2_len (b[0]);
360 /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */
361 vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index;
363 vlib_increment_combined_counter (rx_counter, thread_index,
368 b[0]->error = node->errors[di0.error];
372 if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
375 = vlib_add_trace (vm, node, b[0], sizeof (*tr));
376 tr->next_index = next[0];
377 tr->error = di0.error;
378 tr->tunnel_index = di0.sw_if_index == ~0 ?
379 ~0 : vxm->tunnel_index_by_sw_if_index[di0.sw_if_index];
380 tr->vni = vnet_get_vni (vxlan0);
386 vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors);
387 /* Do we still need this now that tunnel tx stats is kept? */
388 u32 node_idx = is_ip4 ? vxlan4_input_node.index : vxlan6_input_node.index;
389 vlib_node_increment_counter (vm, node_idx, VXLAN_ERROR_DECAPSULATED,
390 from_frame->n_vectors - pkts_dropped);
392 return from_frame->n_vectors;
395 VLIB_NODE_FN (vxlan4_input_node) (vlib_main_t * vm,
396 vlib_node_runtime_t * node,
397 vlib_frame_t * from_frame)
399 return vxlan_input (vm, node, from_frame, /* is_ip4 */ 1);
402 VLIB_NODE_FN (vxlan6_input_node) (vlib_main_t * vm,
403 vlib_node_runtime_t * node,
404 vlib_frame_t * from_frame)
406 return vxlan_input (vm, node, from_frame, /* is_ip4 */ 0);
409 static char *vxlan_error_strings[] = {
410 #define vxlan_error(n,s) s,
411 #include <vxlan/vxlan_error.def>
416 VLIB_REGISTER_NODE (vxlan4_input_node) =
418 .name = "vxlan4-input",
419 .vector_size = sizeof (u32),
420 .n_errors = VXLAN_N_ERROR,
421 .error_strings = vxlan_error_strings,
422 .n_next_nodes = VXLAN_INPUT_N_NEXT,
423 .format_trace = format_vxlan_rx_trace,
425 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
426 foreach_vxlan_input_next
431 VLIB_REGISTER_NODE (vxlan6_input_node) =
433 .name = "vxlan6-input",
434 .vector_size = sizeof (u32),
435 .n_errors = VXLAN_N_ERROR,
436 .error_strings = vxlan_error_strings,
437 .n_next_nodes = VXLAN_INPUT_N_NEXT,
439 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
440 foreach_vxlan_input_next
443 .format_trace = format_vxlan_rx_trace,
449 IP_VXLAN_BYPASS_NEXT_DROP,
450 IP_VXLAN_BYPASS_NEXT_VXLAN,
451 IP_VXLAN_BYPASS_N_NEXT,
452 } ip_vxlan_bypass_next_t;
455 ip_vxlan_bypass_inline (vlib_main_t * vm,
456 vlib_node_runtime_t * node,
457 vlib_frame_t * frame, u32 is_ip4)
459 vxlan_main_t *vxm = &vxlan_main;
460 u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
461 vlib_node_runtime_t *error_node =
462 vlib_node_get_runtime (vm, ip4_input_node.index);
463 vtep4_key_t last_vtep4; /* last IPv4 address / fib index
464 matching a local VTEP address */
465 vtep6_key_t last_vtep6; /* last IPv6 address / fib index
466 matching a local VTEP address */
467 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
469 last_tunnel_cache4 last4;
470 last_tunnel_cache6 last6;
472 from = vlib_frame_vector_args (frame);
473 n_left_from = frame->n_vectors;
474 next_index = node->cached_next_index;
476 vlib_get_buffers (vm, from, bufs, n_left_from);
478 if (node->flags & VLIB_NODE_FLAG_TRACE)
479 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
483 vtep4_key_init (&last_vtep4);
484 clib_memset (&last4, 0xff, sizeof last4);
488 vtep6_key_init (&last_vtep6);
489 clib_memset (&last6, 0xff, sizeof last6);
492 while (n_left_from > 0)
494 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
496 while (n_left_from >= 4 && n_left_to_next >= 2)
498 vlib_buffer_t *b0, *b1;
499 ip4_header_t *ip40, *ip41;
500 ip6_header_t *ip60, *ip61;
501 udp_header_t *udp0, *udp1;
502 vxlan_header_t *vxlan0, *vxlan1;
503 u32 bi0, ip_len0, udp_len0, flags0, next0;
504 u32 bi1, ip_len1, udp_len1, flags1, next1;
505 i32 len_diff0, len_diff1;
506 u8 error0, good_udp0, proto0;
507 u8 error1, good_udp1, proto1;
508 u32 stats_if0 = ~0, stats_if1 = ~0;
510 /* Prefetch next iteration. */
512 vlib_prefetch_buffer_header (b[2], LOAD);
513 vlib_prefetch_buffer_header (b[3], LOAD);
515 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
516 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
519 bi0 = to_next[0] = from[0];
520 bi1 = to_next[1] = from[1];
531 ip40 = vlib_buffer_get_current (b0);
532 ip41 = vlib_buffer_get_current (b1);
536 ip60 = vlib_buffer_get_current (b0);
537 ip61 = vlib_buffer_get_current (b1);
540 /* Setup packet for next IP feature */
541 vnet_feature_next (&next0, b0);
542 vnet_feature_next (&next1, b1);
546 /* Treat IP frag packets as "experimental" protocol for now
547 until support of IP frag reassembly is implemented */
548 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
549 proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
553 proto0 = ip60->protocol;
554 proto1 = ip61->protocol;
557 /* Process packet 0 */
558 if (proto0 != IP_PROTOCOL_UDP)
559 goto exit0; /* not UDP packet */
562 udp0 = ip4_next_header (ip40);
564 udp0 = ip6_next_header (ip60);
566 u32 fi0 = vlib_buffer_get_ip_fib_index (b0, is_ip4);
567 vxlan0 = vlib_buffer_get_current (b0) + sizeof (udp_header_t) +
568 sizeof (ip4_header_t);
570 vxlan_decap_info_t di0 =
572 vxlan4_find_tunnel (vxm, &last4, fi0, ip40, vxlan0, &stats_if0) :
573 vxlan6_find_tunnel (vxm, &last6, fi0, ip60, vxlan0, &stats_if0);
575 if (PREDICT_FALSE (di0.sw_if_index == ~0))
576 goto exit0; /* unknown interface */
578 /* Validate DIP against VTEPs */
581 #ifdef CLIB_HAVE_VEC512
582 if (!vtep4_check_vector (&vxm->vtep_table, b0, ip40, &last_vtep4,
585 if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
587 goto exit0; /* no local VTEP for VXLAN packet */
591 if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
592 goto exit0; /* no local VTEP for VXLAN packet */
596 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
598 /* Don't verify UDP checksum for packets with explicit zero checksum. */
599 good_udp0 |= udp0->checksum == 0;
601 /* Verify UDP length */
603 ip_len0 = clib_net_to_host_u16 (ip40->length);
605 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
606 udp_len0 = clib_net_to_host_u16 (udp0->length);
607 len_diff0 = ip_len0 - udp_len0;
609 /* Verify UDP checksum */
610 if (PREDICT_FALSE (!good_udp0))
613 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
615 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
616 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
621 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
622 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
626 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
627 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
631 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
632 b0->error = error0 ? error_node->errors[error0] : 0;
634 /* vxlan-input node expect current at VXLAN header */
636 vlib_buffer_advance (b0,
637 sizeof (ip4_header_t) +
638 sizeof (udp_header_t));
640 vlib_buffer_advance (b0,
641 sizeof (ip6_header_t) +
642 sizeof (udp_header_t));
645 /* Process packet 1 */
646 if (proto1 != IP_PROTOCOL_UDP)
647 goto exit1; /* not UDP packet */
650 udp1 = ip4_next_header (ip41);
652 udp1 = ip6_next_header (ip61);
654 u32 fi1 = vlib_buffer_get_ip_fib_index (b1, is_ip4);
655 vxlan1 = vlib_buffer_get_current (b1) + sizeof (udp_header_t) +
656 sizeof (ip4_header_t);
658 vxlan_decap_info_t di1 =
660 vxlan4_find_tunnel (vxm, &last4, fi1, ip41, vxlan1, &stats_if1) :
661 vxlan6_find_tunnel (vxm, &last6, fi1, ip61, vxlan1, &stats_if1);
663 if (PREDICT_FALSE (di1.sw_if_index == ~0))
664 goto exit1; /* unknown interface */
666 /* Validate DIP against VTEPs */
669 #ifdef CLIB_HAVE_VEC512
670 if (!vtep4_check_vector (&vxm->vtep_table, b1, ip41, &last_vtep4,
673 if (!vtep4_check (&vxm->vtep_table, b1, ip41, &last_vtep4))
675 goto exit1; /* no local VTEP for VXLAN packet */
679 if (!vtep6_check (&vxm->vtep_table, b1, ip61, &last_vtep6))
680 goto exit1; /* no local VTEP for VXLAN packet */
684 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
686 /* Don't verify UDP checksum for packets with explicit zero checksum. */
687 good_udp1 |= udp1->checksum == 0;
689 /* Verify UDP length */
691 ip_len1 = clib_net_to_host_u16 (ip41->length);
693 ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
694 udp_len1 = clib_net_to_host_u16 (udp1->length);
695 len_diff1 = ip_len1 - udp_len1;
697 /* Verify UDP checksum */
698 if (PREDICT_FALSE (!good_udp1))
701 flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
703 flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
704 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
709 error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
710 error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
714 error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
715 error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
719 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
720 b1->error = error1 ? error_node->errors[error1] : 0;
722 /* vxlan-input node expect current at VXLAN header */
724 vlib_buffer_advance (b1,
725 sizeof (ip4_header_t) +
726 sizeof (udp_header_t));
728 vlib_buffer_advance (b1,
729 sizeof (ip6_header_t) +
730 sizeof (udp_header_t));
733 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
734 to_next, n_left_to_next,
735 bi0, bi1, next0, next1);
738 while (n_left_from > 0 && n_left_to_next > 0)
744 vxlan_header_t *vxlan0;
745 u32 bi0, ip_len0, udp_len0, flags0, next0;
747 u8 error0, good_udp0, proto0;
750 bi0 = to_next[0] = from[0];
759 ip40 = vlib_buffer_get_current (b0);
761 ip60 = vlib_buffer_get_current (b0);
763 /* Setup packet for next IP feature */
764 vnet_feature_next (&next0, b0);
767 /* Treat IP4 frag packets as "experimental" protocol for now
768 until support of IP frag reassembly is implemented */
769 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
771 proto0 = ip60->protocol;
773 if (proto0 != IP_PROTOCOL_UDP)
774 goto exit; /* not UDP packet */
777 udp0 = ip4_next_header (ip40);
779 udp0 = ip6_next_header (ip60);
781 u32 fi0 = vlib_buffer_get_ip_fib_index (b0, is_ip4);
782 vxlan0 = vlib_buffer_get_current (b0) + sizeof (udp_header_t) +
783 sizeof (ip4_header_t);
785 vxlan_decap_info_t di0 =
787 vxlan4_find_tunnel (vxm, &last4, fi0, ip40, vxlan0, &stats_if0) :
788 vxlan6_find_tunnel (vxm, &last6, fi0, ip60, vxlan0, &stats_if0);
790 if (PREDICT_FALSE (di0.sw_if_index == ~0))
791 goto exit; /* unknown interface */
793 /* Validate DIP against VTEPs */
796 #ifdef CLIB_HAVE_VEC512
797 if (!vtep4_check_vector (&vxm->vtep_table, b0, ip40, &last_vtep4,
800 if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
802 goto exit; /* no local VTEP for VXLAN packet */
806 if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
807 goto exit; /* no local VTEP for VXLAN packet */
811 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
813 /* Don't verify UDP checksum for packets with explicit zero checksum. */
814 good_udp0 |= udp0->checksum == 0;
816 /* Verify UDP length */
818 ip_len0 = clib_net_to_host_u16 (ip40->length);
820 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
821 udp_len0 = clib_net_to_host_u16 (udp0->length);
822 len_diff0 = ip_len0 - udp_len0;
824 /* Verify UDP checksum */
825 if (PREDICT_FALSE (!good_udp0))
828 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
830 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
831 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
836 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
837 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
841 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
842 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
846 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
847 b0->error = error0 ? error_node->errors[error0] : 0;
849 /* vxlan-input node expect current at VXLAN header */
851 vlib_buffer_advance (b0,
852 sizeof (ip4_header_t) +
853 sizeof (udp_header_t));
855 vlib_buffer_advance (b0,
856 sizeof (ip6_header_t) +
857 sizeof (udp_header_t));
860 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
861 to_next, n_left_to_next,
865 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
868 return frame->n_vectors;
871 VLIB_NODE_FN (ip4_vxlan_bypass_node) (vlib_main_t * vm,
872 vlib_node_runtime_t * node,
873 vlib_frame_t * frame)
875 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
879 VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) =
881 .name = "ip4-vxlan-bypass",
882 .vector_size = sizeof (u32),
883 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
885 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
886 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-input",
888 .format_buffer = format_ip4_header,
889 .format_trace = format_ip4_forward_next_trace,
894 /* Dummy init function to get us linked in. */
895 static clib_error_t *
896 ip4_vxlan_bypass_init (vlib_main_t * vm)
901 VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init);
903 VLIB_NODE_FN (ip6_vxlan_bypass_node) (vlib_main_t * vm,
904 vlib_node_runtime_t * node,
905 vlib_frame_t * frame)
907 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
911 VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) =
913 .name = "ip6-vxlan-bypass",
914 .vector_size = sizeof (u32),
915 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
917 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
918 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-input",
920 .format_buffer = format_ip6_header,
921 .format_trace = format_ip6_forward_next_trace,
926 /* Dummy init function to get us linked in. */
927 static clib_error_t *
928 ip6_vxlan_bypass_init (vlib_main_t * vm)
933 VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init);
935 #define foreach_vxlan_flow_input_next \
936 _(DROP, "error-drop") \
937 _(L2_INPUT, "l2-input")
941 #define _(s,n) VXLAN_FLOW_NEXT_##s,
942 foreach_vxlan_flow_input_next
945 } vxlan_flow_input_next_t;
947 #define foreach_vxlan_flow_error \
948 _(NONE, "no error") \
949 _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \
950 _(IP_HEADER_ERROR, "Rx ip header errors") \
951 _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \
952 _(UDP_LENGTH_ERROR, "Rx udp length errors")
956 #define _(f,s) VXLAN_FLOW_ERROR_##f,
957 foreach_vxlan_flow_error
960 } vxlan_flow_error_t;
962 static char *vxlan_flow_error_strings[] = {
964 foreach_vxlan_flow_error
969 static_always_inline u8
970 vxlan_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
972 u32 flags = b->flags;
975 sizeof (ip4_header_t) + sizeof (udp_header_t) + sizeof (vxlan_header_t),
978 /* Verify UDP checksum */
979 if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
981 vlib_buffer_advance (b, -offset);
982 flags = ip4_tcp_udp_validate_checksum (vm, b);
983 vlib_buffer_advance (b, offset);
986 return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
989 static_always_inline u8
990 vxlan_check_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
992 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
993 udp_header_t *udp = &hdr->udp;
994 /* Don't verify UDP checksum for packets with explicit zero checksum. */
995 u8 good_csum = (b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0 ||
1001 static_always_inline u8
1002 vxlan_check_ip (vlib_buffer_t * b, u16 payload_len)
1004 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1005 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1006 u16 expected = payload_len + sizeof *hdr;
1007 return ip_len > expected || hdr->ip4.ttl == 0
1008 || hdr->ip4.ip_version_and_header_length != 0x45;
1011 static_always_inline u8
1012 vxlan_check_ip_udp_len (vlib_buffer_t * b)
1014 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1015 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1016 u16 udp_len = clib_net_to_host_u16 (hdr->udp.length);
1017 return udp_len > ip_len;
1020 static_always_inline u8
1021 vxlan_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0)
1023 u8 error0 = VXLAN_FLOW_ERROR_NONE;
1025 error0 = VXLAN_FLOW_ERROR_IP_HEADER_ERROR;
1027 error0 = VXLAN_FLOW_ERROR_UDP_LENGTH_ERROR;
1029 error0 = VXLAN_FLOW_ERROR_UDP_CHECKSUM_ERROR;
1033 VLIB_NODE_FN (vxlan4_flow_input_node) (vlib_main_t * vm,
1034 vlib_node_runtime_t * node,
1038 { payload_offset = sizeof (ip4_vxlan_header_t) };
1040 vxlan_main_t *vxm = &vxlan_main;
1041 vnet_interface_main_t *im = &vnet_main.interface_main;
1042 vlib_combined_counter_main_t *rx_counter[VXLAN_FLOW_N_NEXT] = {
1043 [VXLAN_FLOW_NEXT_DROP] =
1044 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP,
1045 [VXLAN_FLOW_NEXT_L2_INPUT] =
1046 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
1048 u32 thread_index = vlib_get_thread_index ();
1050 u32 *from = vlib_frame_vector_args (f);
1051 u32 n_left_from = f->n_vectors;
1052 u32 next_index = VXLAN_FLOW_NEXT_L2_INPUT;
1054 while (n_left_from > 0)
1056 u32 n_left_to_next, *to_next;
1058 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1060 while (n_left_from > 3 && n_left_to_next > 3)
1062 u32 bi0 = to_next[0] = from[0];
1063 u32 bi1 = to_next[1] = from[1];
1064 u32 bi2 = to_next[2] = from[2];
1065 u32 bi3 = to_next[3] = from[3];
1069 n_left_to_next -= 4;
1071 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1072 vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);
1073 vlib_buffer_t *b2 = vlib_get_buffer (vm, bi2);
1074 vlib_buffer_t *b3 = vlib_get_buffer (vm, bi3);
1076 vlib_buffer_advance (b0, payload_offset);
1077 vlib_buffer_advance (b1, payload_offset);
1078 vlib_buffer_advance (b2, payload_offset);
1079 vlib_buffer_advance (b3, payload_offset);
1081 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1082 u16 len1 = vlib_buffer_length_in_chain (vm, b1);
1083 u16 len2 = vlib_buffer_length_in_chain (vm, b2);
1084 u16 len3 = vlib_buffer_length_in_chain (vm, b3);
1086 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT, next1 =
1087 VXLAN_FLOW_NEXT_L2_INPUT, next2 =
1088 VXLAN_FLOW_NEXT_L2_INPUT, next3 = VXLAN_FLOW_NEXT_L2_INPUT;
1090 u8 ip_err0 = vxlan_check_ip (b0, len0);
1091 u8 ip_err1 = vxlan_check_ip (b1, len1);
1092 u8 ip_err2 = vxlan_check_ip (b2, len2);
1093 u8 ip_err3 = vxlan_check_ip (b3, len3);
1094 u8 ip_err = ip_err0 | ip_err1 | ip_err2 | ip_err3;
1096 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1097 u8 udp_err1 = vxlan_check_ip_udp_len (b1);
1098 u8 udp_err2 = vxlan_check_ip_udp_len (b2);
1099 u8 udp_err3 = vxlan_check_ip_udp_len (b3);
1100 u8 udp_err = udp_err0 | udp_err1 | udp_err2 | udp_err3;
1102 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1103 u8 csum_err1 = vxlan_check_udp_csum (vm, b1);
1104 u8 csum_err2 = vxlan_check_udp_csum (vm, b2);
1105 u8 csum_err3 = vxlan_check_udp_csum (vm, b3);
1106 u8 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1108 if (PREDICT_FALSE (csum_err))
1111 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1113 csum_err1 = !vxlan_validate_udp_csum (vm, b1);
1115 csum_err2 = !vxlan_validate_udp_csum (vm, b2);
1117 csum_err3 = !vxlan_validate_udp_csum (vm, b3);
1118 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1121 if (PREDICT_FALSE (ip_err || udp_err || csum_err))
1123 if (ip_err0 || udp_err0 || csum_err0)
1125 next0 = VXLAN_FLOW_NEXT_DROP;
1126 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1127 b0->error = node->errors[error0];
1129 if (ip_err1 || udp_err1 || csum_err1)
1131 next1 = VXLAN_FLOW_NEXT_DROP;
1132 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1133 b1->error = node->errors[error1];
1135 if (ip_err2 || udp_err2 || csum_err2)
1137 next2 = VXLAN_FLOW_NEXT_DROP;
1138 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1139 b2->error = node->errors[error2];
1141 if (ip_err3 || udp_err3 || csum_err3)
1143 next3 = VXLAN_FLOW_NEXT_DROP;
1144 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1145 b3->error = node->errors[error3];
1149 vnet_update_l2_len (b0);
1150 vnet_update_l2_len (b1);
1151 vnet_update_l2_len (b2);
1152 vnet_update_l2_len (b3);
1154 ASSERT (b0->flow_id != 0);
1155 ASSERT (b1->flow_id != 0);
1156 ASSERT (b2->flow_id != 0);
1157 ASSERT (b3->flow_id != 0);
1159 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1160 u32 t_index1 = b1->flow_id - vxm->flow_id_start;
1161 u32 t_index2 = b2->flow_id - vxm->flow_id_start;
1162 u32 t_index3 = b3->flow_id - vxm->flow_id_start;
1164 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1165 vxlan_tunnel_t *t1 = &vxm->tunnels[t_index1];
1166 vxlan_tunnel_t *t2 = &vxm->tunnels[t_index2];
1167 vxlan_tunnel_t *t3 = &vxm->tunnels[t_index3];
1169 /* flow id consumed */
1175 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1177 u32 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX] =
1179 u32 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX] =
1181 u32 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX] =
1184 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1185 sw_if_index0, 1, len0);
1186 vlib_increment_combined_counter (rx_counter[next1], thread_index,
1187 sw_if_index1, 1, len1);
1188 vlib_increment_combined_counter (rx_counter[next2], thread_index,
1189 sw_if_index2, 1, len2);
1190 vlib_increment_combined_counter (rx_counter[next3], thread_index,
1191 sw_if_index3, 1, len3);
1193 u32 flags = b0->flags | b1->flags | b2->flags | b3->flags;
1195 if (PREDICT_FALSE (flags & VLIB_BUFFER_IS_TRACED))
1197 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1199 vxlan_rx_trace_t *tr =
1200 vlib_add_trace (vm, node, b0, sizeof *tr);
1201 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1202 tr->next_index = next0;
1204 tr->tunnel_index = t_index0;
1207 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1209 vxlan_rx_trace_t *tr =
1210 vlib_add_trace (vm, node, b1, sizeof *tr);
1211 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1212 tr->next_index = next1;
1214 tr->tunnel_index = t_index1;
1217 if (b2->flags & VLIB_BUFFER_IS_TRACED)
1219 vxlan_rx_trace_t *tr =
1220 vlib_add_trace (vm, node, b2, sizeof *tr);
1221 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1222 tr->next_index = next2;
1224 tr->tunnel_index = t_index2;
1227 if (b3->flags & VLIB_BUFFER_IS_TRACED)
1229 vxlan_rx_trace_t *tr =
1230 vlib_add_trace (vm, node, b3, sizeof *tr);
1231 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1232 tr->next_index = next3;
1234 tr->tunnel_index = t_index3;
1238 vlib_validate_buffer_enqueue_x4
1239 (vm, node, next_index, to_next, n_left_to_next,
1240 bi0, bi1, bi2, bi3, next0, next1, next2, next3);
1242 while (n_left_from > 0 && n_left_to_next > 0)
1244 u32 bi0 = to_next[0] = from[0];
1250 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1251 vlib_buffer_advance (b0, payload_offset);
1253 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1254 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT;
1256 u8 ip_err0 = vxlan_check_ip (b0, len0);
1257 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1258 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1261 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1262 if (ip_err0 || udp_err0 || csum_err0)
1264 next0 = VXLAN_FLOW_NEXT_DROP;
1265 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1266 b0->error = node->errors[error0];
1269 vnet_update_l2_len (b0);
1271 ASSERT (b0->flow_id != 0);
1272 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1273 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1276 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1278 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1279 sw_if_index0, 1, len0);
1281 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1283 vxlan_rx_trace_t *tr =
1284 vlib_add_trace (vm, node, b0, sizeof *tr);
1285 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1286 tr->next_index = next0;
1288 tr->tunnel_index = t_index0;
1291 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1292 to_next, n_left_to_next,
1296 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1299 return f->n_vectors;
1303 #ifndef CLIB_MULTIARCH_VARIANT
1304 VLIB_REGISTER_NODE (vxlan4_flow_input_node) = {
1305 .name = "vxlan-flow-input",
1306 .type = VLIB_NODE_TYPE_INTERNAL,
1307 .vector_size = sizeof (u32),
1309 .format_trace = format_vxlan_rx_trace,
1311 .n_errors = VXLAN_FLOW_N_ERROR,
1312 .error_strings = vxlan_flow_error_strings,
1314 .n_next_nodes = VXLAN_FLOW_N_NEXT,
1316 #define _(s,n) [VXLAN_FLOW_NEXT_##s] = n,
1317 foreach_vxlan_flow_input_next
1325 * fd.io coding-style-patch-verification: ON
1328 * eval: (c-set-style "gnu")