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>
23 /* Statistics (not all errors) */
24 #define foreach_vxlan_encap_error \
25 _(ENCAPSULATED, "good packets encapsulated")
27 static char * vxlan_encap_error_strings[] = {
28 #define _(sym,string) string,
29 foreach_vxlan_encap_error
34 #define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
35 foreach_vxlan_encap_error
38 } vxlan_encap_error_t;
41 VXLAN_ENCAP_NEXT_DROP,
48 } vxlan_encap_trace_t;
50 u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
52 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
53 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
54 vxlan_encap_trace_t * t
55 = va_arg (*args, vxlan_encap_trace_t *);
57 s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
58 t->tunnel_index, t->vni);
63 vxlan_encap_inline (vlib_main_t * vm,
64 vlib_node_runtime_t * node,
65 vlib_frame_t * from_frame,
66 u8 is_ip4, u8 csum_offload)
68 u32 n_left_from, next_index, * from, * to_next;
69 vxlan_main_t * vxm = &vxlan_main;
70 vnet_main_t * vnm = vxm->vnet_main;
71 vnet_interface_main_t * im = &vnm->interface_main;
72 vlib_combined_counter_main_t * tx_counter =
73 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
74 u32 pkts_encapsulated = 0;
75 u32 thread_index = vlib_get_thread_index();
76 u32 sw_if_index0 = 0, sw_if_index1 = 0;
77 u32 next0 = 0, next1 = 0;
78 vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
79 index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
81 from = vlib_frame_vector_args (from_frame);
82 n_left_from = from_frame->n_vectors;
84 next_index = node->cached_next_index;
86 STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
87 STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);
89 word const underlay_hdr_len = is_ip4 ?
90 sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
91 u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
92 u32 const csum_flags = is_ip4 ?
93 VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
94 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
95 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
97 while (n_left_from > 0)
101 vlib_get_next_frame (vm, node, next_index,
102 to_next, n_left_to_next);
104 while (n_left_from >= 4 && n_left_to_next >= 2)
106 /* Prefetch next iteration. */
108 vlib_buffer_t * p2, * p3;
110 p2 = vlib_get_buffer (vm, from[2]);
111 p3 = vlib_get_buffer (vm, from[3]);
113 vlib_prefetch_buffer_header (p2, LOAD);
114 vlib_prefetch_buffer_header (p3, LOAD);
116 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
117 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
123 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
124 vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
125 u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
126 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(vec_len(t0->rewrite) == underlay_hdr_len);
173 ASSERT(vec_len(t1->rewrite) == underlay_hdr_len);
175 vlib_buffer_advance (b0, -underlay_hdr_len);
176 vlib_buffer_advance (b1, -underlay_hdr_len);
178 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
179 u32 len1 = vlib_buffer_length_in_chain (vm, b1);
180 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
181 u16 payload_l1 = clib_host_to_net_u16 (len1 - l3_len);
183 ip4_header_t * ip4_0, * ip4_1;
184 ip6_header_t * ip6_0, * ip6_1;
185 udp_header_t * udp0, * udp1;
189 ip4_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
190 ip4_vxlan_header_t * rewrite0 = (void *)t0->rewrite;
191 ip4_vxlan_header_t * hdr1 = vlib_buffer_get_current(b1);
192 ip4_vxlan_header_t * rewrite1 = (void *)t1->rewrite;
196 /* Fix the IP4 checksum and length */
199 ip4_0->length = clib_host_to_net_u16 (len0);
200 ip4_1->length = clib_host_to_net_u16 (len1);
209 ip6_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
210 ip6_vxlan_header_t * rewrite0 = (void *) t0->rewrite;
211 ip6_vxlan_header_t * hdr1 = vlib_buffer_get_current(b0);
212 ip6_vxlan_header_t * rewrite1 = (void *) t1->rewrite;
216 /* Fix IP6 payload length */
219 ip6_0->payload_length = payload_l0;
220 ip6_1->payload_length = payload_l1;
228 /* Fix UDP length and set source port */
229 udp0->length = payload_l0;
230 udp0->src_port = flow_hash0;
231 udp1->length = payload_l1;
232 udp1->src_port = flow_hash1;
236 b0->flags |= csum_flags;
237 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
238 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
239 b1->flags |= csum_flags;
240 vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data;
241 vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data;
243 /* IPv4 UDP checksum only if checksum offload is used */
246 ip_csum_t sum0 = ip4_0->checksum;
247 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
248 length /* changed member */);
249 ip4_0->checksum = ip_csum_fold (sum0);
250 ip_csum_t sum1 = ip4_1->checksum;
251 sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t,
252 length /* changed member */);
253 ip4_1->checksum = ip_csum_fold (sum1);
255 /* IPv6 UDP checksum is mandatory */
260 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
261 (vm, b0, ip6_0, &bogus);
263 if (udp0->checksum == 0)
264 udp0->checksum = 0xffff;
265 udp1->checksum = ip6_tcp_udp_icmp_compute_checksum
266 (vm, b1, ip6_1, &bogus);
268 if (udp1->checksum == 0)
269 udp1->checksum = 0xffff;
272 vlib_increment_combined_counter (tx_counter, thread_index,
273 sw_if_index0, 1, len0);
274 vlib_increment_combined_counter (tx_counter, thread_index,
275 sw_if_index1, 1, len1);
276 pkts_encapsulated += 2;
278 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
280 vxlan_encap_trace_t *tr =
281 vlib_add_trace (vm, node, b0, sizeof (*tr));
282 tr->tunnel_index = t0 - vxm->tunnels;
286 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
288 vxlan_encap_trace_t *tr =
289 vlib_add_trace (vm, node, b1, sizeof (*tr));
290 tr->tunnel_index = t1 - vxm->tunnels;
294 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
295 to_next, n_left_to_next,
296 bi0, bi1, next0, next1);
299 while (n_left_from > 0 && n_left_to_next > 0)
302 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
303 u32 flow_hash0 = vnet_l2_compute_flow_hash(b0);
311 /* Get next node index and adj index from tunnel next_dpo */
312 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
314 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
315 vnet_hw_interface_t *hi0 =
316 vnet_get_sup_hw_interface (vnm, sw_if_index0);
317 t0 = &vxm->tunnels[hi0->dev_instance];
318 /* Note: change to always set next0 if it may be set to drop */
319 next0 = t0->next_dpo.dpoi_next_node;
320 dpoi_idx0 = t0->next_dpo.dpoi_index;
322 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
324 ASSERT(vec_len(t0->rewrite) == underlay_hdr_len);
325 vlib_buffer_advance (b0, -underlay_hdr_len);
327 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
328 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
331 ip4_header_t * ip4_0;
332 ip6_header_t * ip6_0;
336 ip4_vxlan_header_t * rewrite = (void *)t0->rewrite;
337 ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
340 /* Fix the IP4 checksum and length */
342 ip4_0->length = clib_host_to_net_u16 (len0);
349 ip6_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
350 ip6_vxlan_header_t * rewrite = (void *) t0->rewrite;
353 /* Fix IP6 payload length */
355 ip6_0->payload_length = payload_l0;
361 /* Fix UDP length and set source port */
362 udp0->length = payload_l0;
363 udp0->src_port = flow_hash0;
367 b0->flags |= csum_flags;
368 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
369 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
371 /* IPv4 UDP checksum only if checksum offload is used */
374 ip_csum_t sum0 = ip4_0->checksum;
375 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
376 length /* changed member */);
377 ip4_0->checksum = ip_csum_fold (sum0);
379 /* IPv6 UDP checksum is mandatory */
384 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
385 (vm, b0, ip6_0, &bogus);
387 if (udp0->checksum == 0)
388 udp0->checksum = 0xffff;
391 vlib_increment_combined_counter (tx_counter, thread_index,
392 sw_if_index0, 1, len0);
393 pkts_encapsulated ++;
395 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
397 vxlan_encap_trace_t *tr =
398 vlib_add_trace (vm, node, b0, sizeof (*tr));
399 tr->tunnel_index = t0 - vxm->tunnels;
402 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
403 to_next, n_left_to_next,
407 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
410 /* Do we still need this now that tunnel tx stats is kept? */
411 vlib_node_increment_counter (vm, node->node_index,
412 VXLAN_ENCAP_ERROR_ENCAPSULATED,
415 return from_frame->n_vectors;
419 vxlan4_encap (vlib_main_t * vm,
420 vlib_node_runtime_t * node,
421 vlib_frame_t * from_frame)
423 /* Disable chksum offload as setup overhead in tx node is not worthwhile
424 for ip4 header checksum only, unless udp checksum is also required */
425 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
426 /* csum_offload */ 0);
430 vxlan6_encap (vlib_main_t * vm,
431 vlib_node_runtime_t * node,
432 vlib_frame_t * from_frame)
434 /* Enable checksum offload for ip6 as udp checksum is mandatory, */
435 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
436 /* csum_offload */ 1);
439 VLIB_REGISTER_NODE (vxlan4_encap_node) = {
440 .function = vxlan4_encap,
441 .name = "vxlan4-encap",
442 .vector_size = sizeof (u32),
443 .format_trace = format_vxlan_encap_trace,
444 .type = VLIB_NODE_TYPE_INTERNAL,
445 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
446 .error_strings = vxlan_encap_error_strings,
447 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
449 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
453 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_encap_node, vxlan4_encap)
455 VLIB_REGISTER_NODE (vxlan6_encap_node) = {
456 .function = vxlan6_encap,
457 .name = "vxlan6-encap",
458 .vector_size = sizeof (u32),
459 .format_trace = format_vxlan_encap_trace,
460 .type = VLIB_NODE_TYPE_INTERNAL,
461 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
462 .error_strings = vxlan_encap_error_strings,
463 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
465 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
469 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)