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>
415 VLIB_REGISTER_NODE (vxlan4_input_node) =
417 .name = "vxlan4-input",
418 .vector_size = sizeof (u32),
419 .n_errors = VXLAN_N_ERROR,
420 .error_strings = vxlan_error_strings,
421 .n_next_nodes = VXLAN_INPUT_N_NEXT,
422 .format_trace = format_vxlan_rx_trace,
424 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
425 foreach_vxlan_input_next
430 VLIB_REGISTER_NODE (vxlan6_input_node) =
432 .name = "vxlan6-input",
433 .vector_size = sizeof (u32),
434 .n_errors = VXLAN_N_ERROR,
435 .error_strings = vxlan_error_strings,
436 .n_next_nodes = VXLAN_INPUT_N_NEXT,
438 #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n,
439 foreach_vxlan_input_next
442 .format_trace = format_vxlan_rx_trace,
447 IP_VXLAN_BYPASS_NEXT_DROP,
448 IP_VXLAN_BYPASS_NEXT_VXLAN,
449 IP_VXLAN_BYPASS_N_NEXT,
450 } ip_vxlan_bypass_next_t;
453 ip_vxlan_bypass_inline (vlib_main_t * vm,
454 vlib_node_runtime_t * node,
455 vlib_frame_t * frame, u32 is_ip4)
457 vxlan_main_t *vxm = &vxlan_main;
458 u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
459 vlib_node_runtime_t *error_node =
460 vlib_node_get_runtime (vm, ip4_input_node.index);
461 vtep4_key_t last_vtep4; /* last IPv4 address / fib index
462 matching a local VTEP address */
463 vtep6_key_t last_vtep6; /* last IPv6 address / fib index
464 matching a local VTEP address */
465 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
467 last_tunnel_cache4 last4;
468 last_tunnel_cache6 last6;
470 from = vlib_frame_vector_args (frame);
471 n_left_from = frame->n_vectors;
472 next_index = node->cached_next_index;
474 vlib_get_buffers (vm, from, bufs, n_left_from);
476 if (node->flags & VLIB_NODE_FLAG_TRACE)
477 ip4_forward_next_trace (vm, node, frame, VLIB_TX);
481 vtep4_key_init (&last_vtep4);
482 clib_memset (&last4, 0xff, sizeof last4);
486 vtep6_key_init (&last_vtep6);
487 clib_memset (&last6, 0xff, sizeof last6);
490 while (n_left_from > 0)
492 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
494 while (n_left_from >= 4 && n_left_to_next >= 2)
496 vlib_buffer_t *b0, *b1;
497 ip4_header_t *ip40, *ip41;
498 ip6_header_t *ip60, *ip61;
499 udp_header_t *udp0, *udp1;
500 vxlan_header_t *vxlan0, *vxlan1;
501 u32 bi0, ip_len0, udp_len0, flags0, next0;
502 u32 bi1, ip_len1, udp_len1, flags1, next1;
503 i32 len_diff0, len_diff1;
504 u8 error0, good_udp0, proto0;
505 u8 error1, good_udp1, proto1;
506 u32 stats_if0 = ~0, stats_if1 = ~0;
508 /* Prefetch next iteration. */
510 vlib_prefetch_buffer_header (b[2], LOAD);
511 vlib_prefetch_buffer_header (b[3], LOAD);
513 CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
514 CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
517 bi0 = to_next[0] = from[0];
518 bi1 = to_next[1] = from[1];
529 ip40 = vlib_buffer_get_current (b0);
530 ip41 = vlib_buffer_get_current (b1);
534 ip60 = vlib_buffer_get_current (b0);
535 ip61 = vlib_buffer_get_current (b1);
538 /* Setup packet for next IP feature */
539 vnet_feature_next (&next0, b0);
540 vnet_feature_next (&next1, b1);
544 /* Treat IP frag packets as "experimental" protocol for now
545 until support of IP frag reassembly is implemented */
546 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
547 proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol;
551 proto0 = ip60->protocol;
552 proto1 = ip61->protocol;
555 /* Process packet 0 */
556 if (proto0 != IP_PROTOCOL_UDP)
557 goto exit0; /* not UDP packet */
560 udp0 = ip4_next_header (ip40);
562 udp0 = ip6_next_header (ip60);
564 u32 fi0 = vlib_buffer_get_ip_fib_index (b0, is_ip4);
565 vxlan0 = vlib_buffer_get_current (b0) + sizeof (udp_header_t) +
566 sizeof (ip4_header_t);
568 vxlan_decap_info_t di0 =
570 vxlan4_find_tunnel (vxm, &last4, fi0, ip40, vxlan0, &stats_if0) :
571 vxlan6_find_tunnel (vxm, &last6, fi0, ip60, vxlan0, &stats_if0);
573 if (PREDICT_FALSE (di0.sw_if_index == ~0))
574 goto exit0; /* unknown interface */
576 /* Validate DIP against VTEPs */
579 #ifdef CLIB_HAVE_VEC512
580 if (!vtep4_check_vector (&vxm->vtep_table, b0, ip40, &last_vtep4,
583 if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
585 goto exit0; /* no local VTEP for VXLAN packet */
589 if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
590 goto exit0; /* no local VTEP for VXLAN packet */
594 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
596 /* Don't verify UDP checksum for packets with explicit zero checksum. */
597 good_udp0 |= udp0->checksum == 0;
599 /* Verify UDP length */
601 ip_len0 = clib_net_to_host_u16 (ip40->length);
603 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
604 udp_len0 = clib_net_to_host_u16 (udp0->length);
605 len_diff0 = ip_len0 - udp_len0;
607 /* Verify UDP checksum */
608 if (PREDICT_FALSE (!good_udp0))
611 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
613 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
614 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
619 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
620 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
624 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
625 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
629 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
630 b0->error = error0 ? error_node->errors[error0] : 0;
632 /* vxlan-input node expect current at VXLAN header */
634 vlib_buffer_advance (b0,
635 sizeof (ip4_header_t) +
636 sizeof (udp_header_t));
638 vlib_buffer_advance (b0,
639 sizeof (ip6_header_t) +
640 sizeof (udp_header_t));
643 /* Process packet 1 */
644 if (proto1 != IP_PROTOCOL_UDP)
645 goto exit1; /* not UDP packet */
648 udp1 = ip4_next_header (ip41);
650 udp1 = ip6_next_header (ip61);
652 u32 fi1 = vlib_buffer_get_ip_fib_index (b1, is_ip4);
653 vxlan1 = vlib_buffer_get_current (b1) + sizeof (udp_header_t) +
654 sizeof (ip4_header_t);
656 vxlan_decap_info_t di1 =
658 vxlan4_find_tunnel (vxm, &last4, fi1, ip41, vxlan1, &stats_if1) :
659 vxlan6_find_tunnel (vxm, &last6, fi1, ip61, vxlan1, &stats_if1);
661 if (PREDICT_FALSE (di1.sw_if_index == ~0))
662 goto exit1; /* unknown interface */
664 /* Validate DIP against VTEPs */
667 #ifdef CLIB_HAVE_VEC512
668 if (!vtep4_check_vector (&vxm->vtep_table, b1, ip41, &last_vtep4,
671 if (!vtep4_check (&vxm->vtep_table, b1, ip41, &last_vtep4))
673 goto exit1; /* no local VTEP for VXLAN packet */
677 if (!vtep6_check (&vxm->vtep_table, b1, ip61, &last_vtep6))
678 goto exit1; /* no local VTEP for VXLAN packet */
682 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
684 /* Don't verify UDP checksum for packets with explicit zero checksum. */
685 good_udp1 |= udp1->checksum == 0;
687 /* Verify UDP length */
689 ip_len1 = clib_net_to_host_u16 (ip41->length);
691 ip_len1 = clib_net_to_host_u16 (ip61->payload_length);
692 udp_len1 = clib_net_to_host_u16 (udp1->length);
693 len_diff1 = ip_len1 - udp_len1;
695 /* Verify UDP checksum */
696 if (PREDICT_FALSE (!good_udp1))
699 flags1 = ip4_tcp_udp_validate_checksum (vm, b1);
701 flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1);
702 good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
707 error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM;
708 error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH;
712 error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM;
713 error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH;
717 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
718 b1->error = error1 ? error_node->errors[error1] : 0;
720 /* vxlan-input node expect current at VXLAN header */
722 vlib_buffer_advance (b1,
723 sizeof (ip4_header_t) +
724 sizeof (udp_header_t));
726 vlib_buffer_advance (b1,
727 sizeof (ip6_header_t) +
728 sizeof (udp_header_t));
731 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
732 to_next, n_left_to_next,
733 bi0, bi1, next0, next1);
736 while (n_left_from > 0 && n_left_to_next > 0)
742 vxlan_header_t *vxlan0;
743 u32 bi0, ip_len0, udp_len0, flags0, next0;
745 u8 error0, good_udp0, proto0;
748 bi0 = to_next[0] = from[0];
757 ip40 = vlib_buffer_get_current (b0);
759 ip60 = vlib_buffer_get_current (b0);
761 /* Setup packet for next IP feature */
762 vnet_feature_next (&next0, b0);
765 /* Treat IP4 frag packets as "experimental" protocol for now
766 until support of IP frag reassembly is implemented */
767 proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
769 proto0 = ip60->protocol;
771 if (proto0 != IP_PROTOCOL_UDP)
772 goto exit; /* not UDP packet */
775 udp0 = ip4_next_header (ip40);
777 udp0 = ip6_next_header (ip60);
779 u32 fi0 = vlib_buffer_get_ip_fib_index (b0, is_ip4);
780 vxlan0 = vlib_buffer_get_current (b0) + sizeof (udp_header_t) +
781 sizeof (ip4_header_t);
783 vxlan_decap_info_t di0 =
785 vxlan4_find_tunnel (vxm, &last4, fi0, ip40, vxlan0, &stats_if0) :
786 vxlan6_find_tunnel (vxm, &last6, fi0, ip60, vxlan0, &stats_if0);
788 if (PREDICT_FALSE (di0.sw_if_index == ~0))
789 goto exit; /* unknown interface */
791 /* Validate DIP against VTEPs */
794 #ifdef CLIB_HAVE_VEC512
795 if (!vtep4_check_vector (&vxm->vtep_table, b0, ip40, &last_vtep4,
798 if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4))
800 goto exit; /* no local VTEP for VXLAN packet */
804 if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6))
805 goto exit; /* no local VTEP for VXLAN packet */
809 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
811 /* Don't verify UDP checksum for packets with explicit zero checksum. */
812 good_udp0 |= udp0->checksum == 0;
814 /* Verify UDP length */
816 ip_len0 = clib_net_to_host_u16 (ip40->length);
818 ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
819 udp_len0 = clib_net_to_host_u16 (udp0->length);
820 len_diff0 = ip_len0 - udp_len0;
822 /* Verify UDP checksum */
823 if (PREDICT_FALSE (!good_udp0))
826 flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
828 flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
829 good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
834 error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
835 error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
839 error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
840 error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
844 IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN;
845 b0->error = error0 ? error_node->errors[error0] : 0;
847 /* vxlan-input node expect current at VXLAN header */
849 vlib_buffer_advance (b0,
850 sizeof (ip4_header_t) +
851 sizeof (udp_header_t));
853 vlib_buffer_advance (b0,
854 sizeof (ip6_header_t) +
855 sizeof (udp_header_t));
858 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
859 to_next, n_left_to_next,
863 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
866 return frame->n_vectors;
869 VLIB_NODE_FN (ip4_vxlan_bypass_node) (vlib_main_t * vm,
870 vlib_node_runtime_t * node,
871 vlib_frame_t * frame)
873 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1);
876 VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) =
878 .name = "ip4-vxlan-bypass",
879 .vector_size = sizeof (u32),
880 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
882 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
883 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-input",
885 .format_buffer = format_ip4_header,
886 .format_trace = format_ip4_forward_next_trace,
890 /* Dummy init function to get us linked in. */
891 static clib_error_t *
892 ip4_vxlan_bypass_init (vlib_main_t * vm)
897 VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init);
899 VLIB_NODE_FN (ip6_vxlan_bypass_node) (vlib_main_t * vm,
900 vlib_node_runtime_t * node,
901 vlib_frame_t * frame)
903 return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0);
906 VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) =
908 .name = "ip6-vxlan-bypass",
909 .vector_size = sizeof (u32),
910 .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT,
912 [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop",
913 [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-input",
915 .format_buffer = format_ip6_header,
916 .format_trace = format_ip6_forward_next_trace,
920 /* Dummy init function to get us linked in. */
921 static clib_error_t *
922 ip6_vxlan_bypass_init (vlib_main_t * vm)
927 VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init);
929 #define foreach_vxlan_flow_input_next \
930 _(DROP, "error-drop") \
931 _(L2_INPUT, "l2-input")
935 #define _(s,n) VXLAN_FLOW_NEXT_##s,
936 foreach_vxlan_flow_input_next
939 } vxlan_flow_input_next_t;
941 #define foreach_vxlan_flow_error \
942 _(NONE, "no error") \
943 _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \
944 _(IP_HEADER_ERROR, "Rx ip header errors") \
945 _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \
946 _(UDP_LENGTH_ERROR, "Rx udp length errors")
950 #define _(f,s) VXLAN_FLOW_ERROR_##f,
951 foreach_vxlan_flow_error
954 } vxlan_flow_error_t;
956 static char *vxlan_flow_error_strings[] = {
958 foreach_vxlan_flow_error
963 static_always_inline u8
964 vxlan_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
966 u32 flags = b->flags;
969 sizeof (ip4_header_t) + sizeof (udp_header_t) + sizeof (vxlan_header_t),
972 /* Verify UDP checksum */
973 if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0)
975 vlib_buffer_advance (b, -offset);
976 flags = ip4_tcp_udp_validate_checksum (vm, b);
977 vlib_buffer_advance (b, offset);
980 return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
983 static_always_inline u8
984 vxlan_check_udp_csum (vlib_main_t * vm, vlib_buffer_t * b)
986 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
987 udp_header_t *udp = &hdr->udp;
988 /* Don't verify UDP checksum for packets with explicit zero checksum. */
989 u8 good_csum = (b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0 ||
995 static_always_inline u8
996 vxlan_check_ip (vlib_buffer_t * b, u16 payload_len)
998 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
999 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1000 u16 expected = payload_len + sizeof *hdr;
1001 return ip_len > expected || hdr->ip4.ttl == 0
1002 || hdr->ip4.ip_version_and_header_length != 0x45;
1005 static_always_inline u8
1006 vxlan_check_ip_udp_len (vlib_buffer_t * b)
1008 ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr;
1009 u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length);
1010 u16 udp_len = clib_net_to_host_u16 (hdr->udp.length);
1011 return udp_len > ip_len;
1014 static_always_inline u8
1015 vxlan_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0)
1017 u8 error0 = VXLAN_FLOW_ERROR_NONE;
1019 error0 = VXLAN_FLOW_ERROR_IP_HEADER_ERROR;
1021 error0 = VXLAN_FLOW_ERROR_UDP_LENGTH_ERROR;
1023 error0 = VXLAN_FLOW_ERROR_UDP_CHECKSUM_ERROR;
1027 VLIB_NODE_FN (vxlan4_flow_input_node) (vlib_main_t * vm,
1028 vlib_node_runtime_t * node,
1032 { payload_offset = sizeof (ip4_vxlan_header_t) };
1034 vxlan_main_t *vxm = &vxlan_main;
1035 vnet_interface_main_t *im = &vnet_main.interface_main;
1036 vlib_combined_counter_main_t *rx_counter[VXLAN_FLOW_N_NEXT] = {
1037 [VXLAN_FLOW_NEXT_DROP] =
1038 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP,
1039 [VXLAN_FLOW_NEXT_L2_INPUT] =
1040 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
1042 u32 thread_index = vlib_get_thread_index ();
1044 u32 *from = vlib_frame_vector_args (f);
1045 u32 n_left_from = f->n_vectors;
1046 u32 next_index = VXLAN_FLOW_NEXT_L2_INPUT;
1048 while (n_left_from > 0)
1050 u32 n_left_to_next, *to_next;
1052 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1054 while (n_left_from > 3 && n_left_to_next > 3)
1056 u32 bi0 = to_next[0] = from[0];
1057 u32 bi1 = to_next[1] = from[1];
1058 u32 bi2 = to_next[2] = from[2];
1059 u32 bi3 = to_next[3] = from[3];
1063 n_left_to_next -= 4;
1065 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1066 vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);
1067 vlib_buffer_t *b2 = vlib_get_buffer (vm, bi2);
1068 vlib_buffer_t *b3 = vlib_get_buffer (vm, bi3);
1070 vlib_buffer_advance (b0, payload_offset);
1071 vlib_buffer_advance (b1, payload_offset);
1072 vlib_buffer_advance (b2, payload_offset);
1073 vlib_buffer_advance (b3, payload_offset);
1075 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1076 u16 len1 = vlib_buffer_length_in_chain (vm, b1);
1077 u16 len2 = vlib_buffer_length_in_chain (vm, b2);
1078 u16 len3 = vlib_buffer_length_in_chain (vm, b3);
1080 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT, next1 =
1081 VXLAN_FLOW_NEXT_L2_INPUT, next2 =
1082 VXLAN_FLOW_NEXT_L2_INPUT, next3 = VXLAN_FLOW_NEXT_L2_INPUT;
1084 u8 ip_err0 = vxlan_check_ip (b0, len0);
1085 u8 ip_err1 = vxlan_check_ip (b1, len1);
1086 u8 ip_err2 = vxlan_check_ip (b2, len2);
1087 u8 ip_err3 = vxlan_check_ip (b3, len3);
1088 u8 ip_err = ip_err0 | ip_err1 | ip_err2 | ip_err3;
1090 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1091 u8 udp_err1 = vxlan_check_ip_udp_len (b1);
1092 u8 udp_err2 = vxlan_check_ip_udp_len (b2);
1093 u8 udp_err3 = vxlan_check_ip_udp_len (b3);
1094 u8 udp_err = udp_err0 | udp_err1 | udp_err2 | udp_err3;
1096 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1097 u8 csum_err1 = vxlan_check_udp_csum (vm, b1);
1098 u8 csum_err2 = vxlan_check_udp_csum (vm, b2);
1099 u8 csum_err3 = vxlan_check_udp_csum (vm, b3);
1100 u8 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1102 if (PREDICT_FALSE (csum_err))
1105 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1107 csum_err1 = !vxlan_validate_udp_csum (vm, b1);
1109 csum_err2 = !vxlan_validate_udp_csum (vm, b2);
1111 csum_err3 = !vxlan_validate_udp_csum (vm, b3);
1112 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3;
1115 if (PREDICT_FALSE (ip_err || udp_err || csum_err))
1117 if (ip_err0 || udp_err0 || csum_err0)
1119 next0 = VXLAN_FLOW_NEXT_DROP;
1120 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1121 b0->error = node->errors[error0];
1123 if (ip_err1 || udp_err1 || csum_err1)
1125 next1 = VXLAN_FLOW_NEXT_DROP;
1126 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1127 b1->error = node->errors[error1];
1129 if (ip_err2 || udp_err2 || csum_err2)
1131 next2 = VXLAN_FLOW_NEXT_DROP;
1132 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1133 b2->error = node->errors[error2];
1135 if (ip_err3 || udp_err3 || csum_err3)
1137 next3 = VXLAN_FLOW_NEXT_DROP;
1138 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1139 b3->error = node->errors[error3];
1143 vnet_update_l2_len (b0);
1144 vnet_update_l2_len (b1);
1145 vnet_update_l2_len (b2);
1146 vnet_update_l2_len (b3);
1148 ASSERT (b0->flow_id != 0);
1149 ASSERT (b1->flow_id != 0);
1150 ASSERT (b2->flow_id != 0);
1151 ASSERT (b3->flow_id != 0);
1153 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1154 u32 t_index1 = b1->flow_id - vxm->flow_id_start;
1155 u32 t_index2 = b2->flow_id - vxm->flow_id_start;
1156 u32 t_index3 = b3->flow_id - vxm->flow_id_start;
1158 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1159 vxlan_tunnel_t *t1 = &vxm->tunnels[t_index1];
1160 vxlan_tunnel_t *t2 = &vxm->tunnels[t_index2];
1161 vxlan_tunnel_t *t3 = &vxm->tunnels[t_index3];
1163 /* flow id consumed */
1169 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1171 u32 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX] =
1173 u32 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX] =
1175 u32 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX] =
1178 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1179 sw_if_index0, 1, len0);
1180 vlib_increment_combined_counter (rx_counter[next1], thread_index,
1181 sw_if_index1, 1, len1);
1182 vlib_increment_combined_counter (rx_counter[next2], thread_index,
1183 sw_if_index2, 1, len2);
1184 vlib_increment_combined_counter (rx_counter[next3], thread_index,
1185 sw_if_index3, 1, len3);
1187 u32 flags = b0->flags | b1->flags | b2->flags | b3->flags;
1189 if (PREDICT_FALSE (flags & VLIB_BUFFER_IS_TRACED))
1191 if (b0->flags & VLIB_BUFFER_IS_TRACED)
1193 vxlan_rx_trace_t *tr =
1194 vlib_add_trace (vm, node, b0, sizeof *tr);
1195 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1196 tr->next_index = next0;
1198 tr->tunnel_index = t_index0;
1201 if (b1->flags & VLIB_BUFFER_IS_TRACED)
1203 vxlan_rx_trace_t *tr =
1204 vlib_add_trace (vm, node, b1, sizeof *tr);
1205 u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1);
1206 tr->next_index = next1;
1208 tr->tunnel_index = t_index1;
1211 if (b2->flags & VLIB_BUFFER_IS_TRACED)
1213 vxlan_rx_trace_t *tr =
1214 vlib_add_trace (vm, node, b2, sizeof *tr);
1215 u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2);
1216 tr->next_index = next2;
1218 tr->tunnel_index = t_index2;
1221 if (b3->flags & VLIB_BUFFER_IS_TRACED)
1223 vxlan_rx_trace_t *tr =
1224 vlib_add_trace (vm, node, b3, sizeof *tr);
1225 u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3);
1226 tr->next_index = next3;
1228 tr->tunnel_index = t_index3;
1232 vlib_validate_buffer_enqueue_x4
1233 (vm, node, next_index, to_next, n_left_to_next,
1234 bi0, bi1, bi2, bi3, next0, next1, next2, next3);
1236 while (n_left_from > 0 && n_left_to_next > 0)
1238 u32 bi0 = to_next[0] = from[0];
1244 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
1245 vlib_buffer_advance (b0, payload_offset);
1247 u16 len0 = vlib_buffer_length_in_chain (vm, b0);
1248 u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT;
1250 u8 ip_err0 = vxlan_check_ip (b0, len0);
1251 u8 udp_err0 = vxlan_check_ip_udp_len (b0);
1252 u8 csum_err0 = vxlan_check_udp_csum (vm, b0);
1255 csum_err0 = !vxlan_validate_udp_csum (vm, b0);
1256 if (ip_err0 || udp_err0 || csum_err0)
1258 next0 = VXLAN_FLOW_NEXT_DROP;
1259 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1260 b0->error = node->errors[error0];
1263 vnet_update_l2_len (b0);
1265 ASSERT (b0->flow_id != 0);
1266 u32 t_index0 = b0->flow_id - vxm->flow_id_start;
1267 vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0];
1270 u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] =
1272 vlib_increment_combined_counter (rx_counter[next0], thread_index,
1273 sw_if_index0, 1, len0);
1275 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1277 vxlan_rx_trace_t *tr =
1278 vlib_add_trace (vm, node, b0, sizeof *tr);
1279 u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0);
1280 tr->next_index = next0;
1282 tr->tunnel_index = t_index0;
1285 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1286 to_next, n_left_to_next,
1290 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1293 return f->n_vectors;
1296 #ifndef CLIB_MULTIARCH_VARIANT
1297 VLIB_REGISTER_NODE (vxlan4_flow_input_node) = {
1298 .name = "vxlan-flow-input",
1299 .type = VLIB_NODE_TYPE_INTERNAL,
1300 .vector_size = sizeof (u32),
1302 .format_trace = format_vxlan_rx_trace,
1304 .n_errors = VXLAN_FLOW_N_ERROR,
1305 .error_strings = vxlan_flow_error_strings,
1307 .n_next_nodes = VXLAN_FLOW_N_NEXT,
1309 #define _(s,n) [VXLAN_FLOW_NEXT_##s] = n,
1310 foreach_vxlan_flow_input_next
1317 * fd.io coding-style-patch-verification: ON
1320 * eval: (c-set-style "gnu")