3 * Copyright (c) 2015 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include <vppinfra/error.h>
17 #include <vppinfra/hash.h>
18 #include <vnet/vnet.h>
19 #include <vnet/ip/ip.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/vxlan/vxlan.h>
22 #include <vnet/qos/qos_types.h>
24 /* Statistics (not all errors) */
25 #define foreach_vxlan_encap_error \
26 _(ENCAPSULATED, "good packets encapsulated")
28 static char * vxlan_encap_error_strings[] = {
29 #define _(sym,string) string,
30 foreach_vxlan_encap_error
35 #define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
36 foreach_vxlan_encap_error
39 } vxlan_encap_error_t;
42 VXLAN_ENCAP_NEXT_DROP,
49 } vxlan_encap_trace_t;
51 u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
53 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
54 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
55 vxlan_encap_trace_t * t
56 = va_arg (*args, vxlan_encap_trace_t *);
58 s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
59 t->tunnel_index, t->vni);
64 vxlan_encap_inline (vlib_main_t * vm,
65 vlib_node_runtime_t * node,
66 vlib_frame_t * from_frame,
67 u8 is_ip4, u8 csum_offload)
69 u32 n_left_from, next_index, * from, * to_next;
70 vxlan_main_t * vxm = &vxlan_main;
71 vnet_main_t * vnm = vxm->vnet_main;
72 vnet_interface_main_t * im = &vnm->interface_main;
73 vlib_combined_counter_main_t * tx_counter =
74 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
75 u32 pkts_encapsulated = 0;
76 u32 thread_index = vlib_get_thread_index();
77 u32 sw_if_index0 = 0, sw_if_index1 = 0;
78 u32 next0 = 0, next1 = 0;
79 vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
80 index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
82 from = vlib_frame_vector_args (from_frame);
83 n_left_from = from_frame->n_vectors;
85 next_index = node->cached_next_index;
87 STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
88 STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);
90 word const underlay_hdr_len = is_ip4 ?
91 sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
92 u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
93 u32 const csum_flags = is_ip4 ?
94 VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
95 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
96 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
98 while (n_left_from > 0)
102 vlib_get_next_frame (vm, node, next_index,
103 to_next, n_left_to_next);
105 while (n_left_from >= 4 && n_left_to_next >= 2)
107 /* Prefetch next iteration. */
109 vlib_buffer_t * p2, * p3;
111 p2 = vlib_get_buffer (vm, from[2]);
112 p3 = vlib_get_buffer (vm, from[3]);
114 vlib_prefetch_buffer_header (p2, LOAD);
115 vlib_prefetch_buffer_header (p3, LOAD);
117 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
118 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
124 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
125 vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
126 u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
127 u32 flow_hash1 = vnet_l2_compute_flow_hash (b1);
136 /* Get next node index and adj index from tunnel next_dpo */
137 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
139 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
140 vnet_hw_interface_t *hi0 =
141 vnet_get_sup_hw_interface (vnm, sw_if_index0);
142 t0 = &vxm->tunnels[hi0->dev_instance];
143 /* Note: change to always set next0 if it may set to drop */
144 next0 = t0->next_dpo.dpoi_next_node;
145 dpoi_idx0 = t0->next_dpo.dpoi_index;
148 /* Get next node index and adj index from tunnel next_dpo */
149 if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX])
151 if (sw_if_index0 == vnet_buffer(b1)->sw_if_index[VLIB_TX])
153 sw_if_index1 = sw_if_index0;
156 dpoi_idx1 = dpoi_idx0;
160 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
161 vnet_hw_interface_t *hi1 =
162 vnet_get_sup_hw_interface (vnm, sw_if_index1);
163 t1 = &vxm->tunnels[hi1->dev_instance];
164 /* Note: change to always set next1 if it may set to drop */
165 next1 = t1->next_dpo.dpoi_next_node;
166 dpoi_idx1 = t1->next_dpo.dpoi_index;
170 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
171 vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpoi_idx1;
173 ASSERT(vec_len(t0->rewrite) == underlay_hdr_len);
174 ASSERT(vec_len(t1->rewrite) == underlay_hdr_len);
176 vlib_buffer_advance (b0, -underlay_hdr_len);
177 vlib_buffer_advance (b1, -underlay_hdr_len);
179 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
180 u32 len1 = vlib_buffer_length_in_chain (vm, b1);
181 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
182 u16 payload_l1 = clib_host_to_net_u16 (len1 - l3_len);
184 ip4_header_t * ip4_0, * ip4_1;
185 qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0;
186 ip6_header_t * ip6_0, * ip6_1;
187 udp_header_t * udp0, * udp1;
191 ip4_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
192 ip4_vxlan_header_t * rewrite0 = (void *)t0->rewrite;
193 ip4_vxlan_header_t * hdr1 = vlib_buffer_get_current(b1);
194 ip4_vxlan_header_t * rewrite1 = (void *)t1->rewrite;
198 /* Fix the IP4 checksum and length */
201 ip4_0->length = clib_host_to_net_u16 (len0);
202 ip4_1->length = clib_host_to_net_u16 (len1);
204 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
206 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
207 ip4_0->tos = ip4_0_tos;
209 if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID))
211 ip4_1_tos = vnet_buffer2 (b1)->qos.bits;
212 ip4_1->tos = ip4_1_tos;
222 ip6_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
223 ip6_vxlan_header_t * rewrite0 = (void *) t0->rewrite;
224 ip6_vxlan_header_t * hdr1 = vlib_buffer_get_current(b0);
225 ip6_vxlan_header_t * rewrite1 = (void *) t1->rewrite;
229 /* Fix IP6 payload length */
232 ip6_0->payload_length = payload_l0;
233 ip6_1->payload_length = payload_l1;
241 /* Fix UDP length and set source port */
242 udp0->length = payload_l0;
243 udp0->src_port = flow_hash0;
244 udp1->length = payload_l1;
245 udp1->src_port = flow_hash1;
249 b0->flags |= csum_flags;
250 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
251 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
252 b1->flags |= csum_flags;
253 vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data;
254 vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data;
256 /* IPv4 UDP checksum only if checksum offload is used */
259 ip_csum_t sum0 = ip4_0->checksum;
260 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
261 length /* changed member */);
262 if (PREDICT_FALSE (ip4_0_tos))
264 sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
265 tos /* changed member */);
267 ip4_0->checksum = ip_csum_fold (sum0);
268 ip_csum_t sum1 = ip4_1->checksum;
269 sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t,
270 length /* changed member */);
271 if (PREDICT_FALSE (ip4_1_tos))
273 sum1 = ip_csum_update (sum1, 0, ip4_1_tos, ip4_header_t,
274 tos /* changed member */);
276 ip4_1->checksum = ip_csum_fold (sum1);
278 /* IPv6 UDP checksum is mandatory */
283 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
284 (vm, b0, ip6_0, &bogus);
286 if (udp0->checksum == 0)
287 udp0->checksum = 0xffff;
288 udp1->checksum = ip6_tcp_udp_icmp_compute_checksum
289 (vm, b1, ip6_1, &bogus);
291 if (udp1->checksum == 0)
292 udp1->checksum = 0xffff;
295 vlib_increment_combined_counter (tx_counter, thread_index,
296 sw_if_index0, 1, len0);
297 vlib_increment_combined_counter (tx_counter, thread_index,
298 sw_if_index1, 1, len1);
299 pkts_encapsulated += 2;
301 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
303 vxlan_encap_trace_t *tr =
304 vlib_add_trace (vm, node, b0, sizeof (*tr));
305 tr->tunnel_index = t0 - vxm->tunnels;
309 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
311 vxlan_encap_trace_t *tr =
312 vlib_add_trace (vm, node, b1, sizeof (*tr));
313 tr->tunnel_index = t1 - vxm->tunnels;
317 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
318 to_next, n_left_to_next,
319 bi0, bi1, next0, next1);
322 while (n_left_from > 0 && n_left_to_next > 0)
325 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
326 u32 flow_hash0 = vnet_l2_compute_flow_hash(b0);
334 /* Get next node index and adj index from tunnel next_dpo */
335 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
337 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
338 vnet_hw_interface_t *hi0 =
339 vnet_get_sup_hw_interface (vnm, sw_if_index0);
340 t0 = &vxm->tunnels[hi0->dev_instance];
341 /* Note: change to always set next0 if it may be set to drop */
342 next0 = t0->next_dpo.dpoi_next_node;
343 dpoi_idx0 = t0->next_dpo.dpoi_index;
345 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
347 ASSERT(vec_len(t0->rewrite) == underlay_hdr_len);
348 vlib_buffer_advance (b0, -underlay_hdr_len);
350 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
351 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
354 ip4_header_t * ip4_0;
355 qos_bits_t ip4_0_tos = 0;
356 ip6_header_t * ip6_0;
360 ip4_vxlan_header_t * rewrite = (void *)t0->rewrite;
361 ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
364 /* Fix the IP4 checksum and length */
366 ip4_0->length = clib_host_to_net_u16 (len0);
368 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
370 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
371 ip4_0->tos = ip4_0_tos;
379 ip6_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
380 ip6_vxlan_header_t * rewrite = (void *) t0->rewrite;
383 /* Fix IP6 payload length */
385 ip6_0->payload_length = payload_l0;
391 /* Fix UDP length and set source port */
392 udp0->length = payload_l0;
393 udp0->src_port = flow_hash0;
397 b0->flags |= csum_flags;
398 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
399 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
401 /* IPv4 UDP checksum only if checksum offload is used */
404 ip_csum_t sum0 = ip4_0->checksum;
405 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
406 length /* changed member */);
407 if (PREDICT_FALSE (ip4_0_tos))
409 sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
410 tos /* changed member */);
412 ip4_0->checksum = ip_csum_fold (sum0);
414 /* IPv6 UDP checksum is mandatory */
419 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
420 (vm, b0, ip6_0, &bogus);
422 if (udp0->checksum == 0)
423 udp0->checksum = 0xffff;
426 vlib_increment_combined_counter (tx_counter, thread_index,
427 sw_if_index0, 1, len0);
428 pkts_encapsulated ++;
430 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
432 vxlan_encap_trace_t *tr =
433 vlib_add_trace (vm, node, b0, sizeof (*tr));
434 tr->tunnel_index = t0 - vxm->tunnels;
437 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
438 to_next, n_left_to_next,
442 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
445 /* Do we still need this now that tunnel tx stats is kept? */
446 vlib_node_increment_counter (vm, node->node_index,
447 VXLAN_ENCAP_ERROR_ENCAPSULATED,
450 return from_frame->n_vectors;
454 vxlan4_encap (vlib_main_t * vm,
455 vlib_node_runtime_t * node,
456 vlib_frame_t * from_frame)
458 /* Disable chksum offload as setup overhead in tx node is not worthwhile
459 for ip4 header checksum only, unless udp checksum is also required */
460 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
461 /* csum_offload */ 0);
465 vxlan6_encap (vlib_main_t * vm,
466 vlib_node_runtime_t * node,
467 vlib_frame_t * from_frame)
469 /* Enable checksum offload for ip6 as udp checksum is mandatory, */
470 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
471 /* csum_offload */ 1);
474 VLIB_REGISTER_NODE (vxlan4_encap_node) = {
475 .function = vxlan4_encap,
476 .name = "vxlan4-encap",
477 .vector_size = sizeof (u32),
478 .format_trace = format_vxlan_encap_trace,
479 .type = VLIB_NODE_TYPE_INTERNAL,
480 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
481 .error_strings = vxlan_encap_error_strings,
482 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
484 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
488 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_encap_node, vxlan4_encap)
490 VLIB_REGISTER_NODE (vxlan6_encap_node) = {
491 .function = vxlan6_encap,
492 .name = "vxlan6-encap",
493 .vector_size = sizeof (u32),
494 .format_trace = format_vxlan_encap_trace,
495 .type = VLIB_NODE_TYPE_INTERNAL,
496 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
497 .error_strings = vxlan_encap_error_strings,
498 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
500 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
504 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)