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>
23 #include <vnet/adj/rewrite.h>
25 /* Statistics (not all errors) */
26 #define foreach_vxlan_encap_error \
27 _(ENCAPSULATED, "good packets encapsulated")
29 static char * vxlan_encap_error_strings[] = {
30 #define _(sym,string) string,
31 foreach_vxlan_encap_error
36 #define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
37 foreach_vxlan_encap_error
40 } vxlan_encap_error_t;
43 VXLAN_ENCAP_NEXT_DROP,
50 } vxlan_encap_trace_t;
52 #ifndef CLIB_MARCH_VARIANT
53 u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
55 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
56 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
57 vxlan_encap_trace_t * t
58 = va_arg (*args, vxlan_encap_trace_t *);
60 s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
61 t->tunnel_index, t->vni);
67 vxlan_encap_inline (vlib_main_t * vm,
68 vlib_node_runtime_t * node,
69 vlib_frame_t * from_frame,
70 u8 is_ip4, u8 csum_offload)
72 u32 n_left_from, next_index, * from, * to_next;
73 vxlan_main_t * vxm = &vxlan_main;
74 vnet_main_t * vnm = vxm->vnet_main;
75 vnet_interface_main_t * im = &vnm->interface_main;
76 vlib_combined_counter_main_t * tx_counter =
77 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
78 u32 pkts_encapsulated = 0;
79 u32 thread_index = vlib_get_thread_index();
80 u32 sw_if_index0 = 0, sw_if_index1 = 0;
81 u32 next0 = 0, next1 = 0;
82 vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
83 index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
84 vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
85 vlib_buffer_t **b = bufs;
87 from = vlib_frame_vector_args (from_frame);
88 n_left_from = from_frame->n_vectors;
90 next_index = node->cached_next_index;
92 STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
93 STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);
95 u8 const underlay_hdr_len = is_ip4 ?
96 sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
97 u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
98 u32 const csum_flags = is_ip4 ? VNET_BUFFER_F_OFFLOAD_IP_CKSUM |
99 VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
100 VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
101 vlib_get_buffers (vm, from, bufs, n_left_from);
103 while (n_left_from > 0)
107 vlib_get_next_frame (vm, node, next_index,
108 to_next, n_left_to_next);
110 while (n_left_from >= 4 && n_left_to_next >= 2)
112 /* Prefetch next iteration. */
114 vlib_prefetch_buffer_header (b[2], LOAD);
115 vlib_prefetch_buffer_header (b[3], LOAD);
117 CLIB_PREFETCH (b[2]->data - CLIB_CACHE_LINE_BYTES, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
118 CLIB_PREFETCH (b[3]->data - CLIB_CACHE_LINE_BYTES, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
121 u32 bi0 = to_next[0] = from[0];
122 u32 bi1 = to_next[1] = from[1];
128 vlib_buffer_t * b0 = b[0];
129 vlib_buffer_t * b1 = b[1];
132 u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
133 u32 flow_hash1 = vnet_l2_compute_flow_hash (b1);
135 /* Get next node index and adj index from tunnel next_dpo */
136 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
138 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
139 vnet_hw_interface_t *hi0 =
140 vnet_get_sup_hw_interface (vnm, sw_if_index0);
141 t0 = &vxm->tunnels[hi0->dev_instance];
142 /* Note: change to always set next0 if it may set to drop */
143 next0 = t0->next_dpo.dpoi_next_node;
144 dpoi_idx0 = t0->next_dpo.dpoi_index;
147 /* Get next node index and adj index from tunnel next_dpo */
148 if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX])
150 if (sw_if_index0 == vnet_buffer(b1)->sw_if_index[VLIB_TX])
152 sw_if_index1 = sw_if_index0;
155 dpoi_idx1 = dpoi_idx0;
159 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
160 vnet_hw_interface_t *hi1 =
161 vnet_get_sup_hw_interface (vnm, sw_if_index1);
162 t1 = &vxm->tunnels[hi1->dev_instance];
163 /* Note: change to always set next1 if it may set to drop */
164 next1 = t1->next_dpo.dpoi_next_node;
165 dpoi_idx1 = t1->next_dpo.dpoi_index;
169 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
170 vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpoi_idx1;
172 ASSERT(t0->rewrite_header.data_bytes == underlay_hdr_len);
173 ASSERT(t1->rewrite_header.data_bytes == underlay_hdr_len);
174 vnet_rewrite_two_headers(*t0, *t1, vlib_buffer_get_current(b0), vlib_buffer_get_current(b1), 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 void * underlay0 = vlib_buffer_get_current(b0);
185 void * underlay1 = vlib_buffer_get_current(b1);
187 ip4_header_t * ip4_0, * ip4_1;
188 qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0;
189 ip6_header_t * ip6_0, * ip6_1;
190 udp_header_t * udp0, * udp1;
194 ip4_vxlan_header_t * hdr0 = underlay0;
195 ip4_vxlan_header_t * hdr1 = underlay1;
197 /* Fix the IP4 checksum and length */
200 ip4_0->length = clib_host_to_net_u16 (len0);
201 ip4_1->length = clib_host_to_net_u16 (len1);
203 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
205 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
206 ip4_0->tos = ip4_0_tos;
208 if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID))
210 ip4_1_tos = vnet_buffer2 (b1)->qos.bits;
211 ip4_1->tos = ip4_1_tos;
221 ip6_vxlan_header_t * hdr0 = underlay0;
222 ip6_vxlan_header_t * hdr1 = underlay1;
224 /* Fix IP6 payload length */
227 ip6_0->payload_length = payload_l0;
228 ip6_1->payload_length = payload_l1;
236 /* Fix UDP length and set source port */
237 udp0->length = payload_l0;
238 udp0->src_port = flow_hash0;
239 udp1->length = payload_l1;
240 udp1->src_port = flow_hash1;
244 b0->flags |= csum_flags;
245 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
246 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
247 b1->flags |= csum_flags;
248 vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data;
249 vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data;
251 /* IPv4 UDP checksum only if checksum offload is used */
254 ip_csum_t sum0 = ip4_0->checksum;
255 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
256 length /* changed member */);
257 if (PREDICT_FALSE (ip4_0_tos))
259 sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
260 tos /* changed member */);
262 ip4_0->checksum = ip_csum_fold (sum0);
263 ip_csum_t sum1 = ip4_1->checksum;
264 sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t,
265 length /* changed member */);
266 if (PREDICT_FALSE (ip4_1_tos))
268 sum1 = ip_csum_update (sum1, 0, ip4_1_tos, ip4_header_t,
269 tos /* changed member */);
271 ip4_1->checksum = ip_csum_fold (sum1);
273 /* IPv6 UDP checksum is mandatory */
278 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
279 (vm, b0, ip6_0, &bogus);
281 if (udp0->checksum == 0)
282 udp0->checksum = 0xffff;
283 udp1->checksum = ip6_tcp_udp_icmp_compute_checksum
284 (vm, b1, ip6_1, &bogus);
286 if (udp1->checksum == 0)
287 udp1->checksum = 0xffff;
290 /* save inner packet flow_hash for load-balance node */
291 vnet_buffer (b0)->ip.flow_hash = flow_hash0;
292 vnet_buffer (b1)->ip.flow_hash = flow_hash1;
294 if (sw_if_index0 == sw_if_index1)
296 vlib_increment_combined_counter (tx_counter, thread_index,
297 sw_if_index0, 2, len0 + len1);
301 vlib_increment_combined_counter (tx_counter, thread_index,
302 sw_if_index0, 1, len0);
303 vlib_increment_combined_counter (tx_counter, thread_index,
304 sw_if_index1, 1, len1);
306 pkts_encapsulated += 2;
308 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
310 vxlan_encap_trace_t *tr =
311 vlib_add_trace (vm, node, b0, sizeof (*tr));
312 tr->tunnel_index = t0 - vxm->tunnels;
316 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
318 vxlan_encap_trace_t *tr =
319 vlib_add_trace (vm, node, b1, sizeof (*tr));
320 tr->tunnel_index = t1 - vxm->tunnels;
324 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
325 to_next, n_left_to_next,
326 bi0, bi1, next0, next1);
329 while (n_left_from > 0 && n_left_to_next > 0)
331 u32 bi0 = to_next[0] = from[0];
337 vlib_buffer_t * b0 = b[0];
340 u32 flow_hash0 = vnet_l2_compute_flow_hash(b0);
342 /* Get next node index and adj index from tunnel next_dpo */
343 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
345 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
346 vnet_hw_interface_t *hi0 =
347 vnet_get_sup_hw_interface (vnm, sw_if_index0);
348 t0 = &vxm->tunnels[hi0->dev_instance];
349 /* Note: change to always set next0 if it may be set to drop */
350 next0 = t0->next_dpo.dpoi_next_node;
351 dpoi_idx0 = t0->next_dpo.dpoi_index;
353 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
355 ASSERT(t0->rewrite_header.data_bytes == underlay_hdr_len);
356 vnet_rewrite_one_header(*t0, vlib_buffer_get_current(b0), underlay_hdr_len);
358 vlib_buffer_advance (b0, -underlay_hdr_len);
359 void * underlay0 = vlib_buffer_get_current(b0);
361 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
362 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
365 ip4_header_t * ip4_0;
366 qos_bits_t ip4_0_tos = 0;
367 ip6_header_t * ip6_0;
371 ip4_vxlan_header_t * hdr = underlay0;
373 /* Fix the IP4 checksum and length */
375 ip4_0->length = clib_host_to_net_u16 (len0);
377 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
379 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
380 ip4_0->tos = ip4_0_tos;
388 ip6_vxlan_header_t * hdr = underlay0;
390 /* Fix IP6 payload length */
392 ip6_0->payload_length = payload_l0;
398 /* Fix UDP length and set source port */
399 udp0->length = payload_l0;
400 udp0->src_port = flow_hash0;
404 b0->flags |= csum_flags;
405 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
406 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
408 /* IPv4 UDP checksum only if checksum offload is used */
411 ip_csum_t sum0 = ip4_0->checksum;
412 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
413 length /* changed member */);
414 if (PREDICT_FALSE (ip4_0_tos))
416 sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
417 tos /* changed member */);
419 ip4_0->checksum = ip_csum_fold (sum0);
421 /* IPv6 UDP checksum is mandatory */
426 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
427 (vm, b0, ip6_0, &bogus);
429 if (udp0->checksum == 0)
430 udp0->checksum = 0xffff;
433 /* reuse inner packet flow_hash for load-balance node */
434 vnet_buffer (b0)->ip.flow_hash = flow_hash0;
436 vlib_increment_combined_counter (tx_counter, thread_index,
437 sw_if_index0, 1, len0);
438 pkts_encapsulated ++;
440 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
442 vxlan_encap_trace_t *tr =
443 vlib_add_trace (vm, node, b0, sizeof (*tr));
444 tr->tunnel_index = t0 - vxm->tunnels;
447 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
448 to_next, n_left_to_next,
452 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
455 /* Do we still need this now that tunnel tx stats is kept? */
456 vlib_node_increment_counter (vm, node->node_index,
457 VXLAN_ENCAP_ERROR_ENCAPSULATED,
460 return from_frame->n_vectors;
463 VLIB_NODE_FN (vxlan4_encap_node) (vlib_main_t * vm,
464 vlib_node_runtime_t * node,
465 vlib_frame_t * from_frame)
467 /* Disable chksum offload as setup overhead in tx node is not worthwhile
468 for ip4 header checksum only, unless udp checksum is also required */
469 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
470 /* csum_offload */ 0);
473 VLIB_NODE_FN (vxlan6_encap_node) (vlib_main_t * vm,
474 vlib_node_runtime_t * node,
475 vlib_frame_t * from_frame)
477 /* Enable checksum offload for ip6 as udp checksum is mandatory, */
478 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
479 /* csum_offload */ 1);
482 VLIB_REGISTER_NODE (vxlan4_encap_node) = {
483 .name = "vxlan4-encap",
484 .vector_size = sizeof (u32),
485 .format_trace = format_vxlan_encap_trace,
486 .type = VLIB_NODE_TYPE_INTERNAL,
487 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
488 .error_strings = vxlan_encap_error_strings,
489 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
491 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
495 VLIB_REGISTER_NODE (vxlan6_encap_node) = {
496 .name = "vxlan6-encap",
497 .vector_size = sizeof (u32),
498 .format_trace = format_vxlan_encap_trace,
499 .type = VLIB_NODE_TYPE_INTERNAL,
500 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
501 .error_strings = vxlan_encap_error_strings,
502 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
504 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",