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 u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
54 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56 vxlan_encap_trace_t * t
57 = va_arg (*args, vxlan_encap_trace_t *);
59 s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
60 t->tunnel_index, t->vni);
65 vxlan_encap_inline (vlib_main_t * vm,
66 vlib_node_runtime_t * node,
67 vlib_frame_t * from_frame,
68 u8 is_ip4, u8 csum_offload)
70 u32 n_left_from, next_index, * from, * to_next;
71 vxlan_main_t * vxm = &vxlan_main;
72 vnet_main_t * vnm = vxm->vnet_main;
73 vnet_interface_main_t * im = &vnm->interface_main;
74 vlib_combined_counter_main_t * tx_counter =
75 im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
76 u32 pkts_encapsulated = 0;
77 u32 thread_index = vlib_get_thread_index();
78 u32 sw_if_index0 = 0, sw_if_index1 = 0;
79 u32 next0 = 0, next1 = 0;
80 vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
81 index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
83 from = vlib_frame_vector_args (from_frame);
84 n_left_from = from_frame->n_vectors;
86 next_index = node->cached_next_index;
88 STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
89 STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);
91 u8 const underlay_hdr_len = is_ip4 ?
92 sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
93 u8 const rw_hdr_offset = sizeof t0->rewrite_data - underlay_hdr_len;
94 u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
95 u32 const csum_flags = is_ip4 ?
96 VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
97 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
98 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
100 while (n_left_from > 0)
104 vlib_get_next_frame (vm, node, next_index,
105 to_next, n_left_to_next);
107 while (n_left_from >= 4 && n_left_to_next >= 2)
109 /* Prefetch next iteration. */
111 vlib_buffer_t * p2, * p3;
113 p2 = vlib_get_buffer (vm, from[2]);
114 p3 = vlib_get_buffer (vm, from[3]);
116 vlib_prefetch_buffer_header (p2, LOAD);
117 vlib_prefetch_buffer_header (p3, LOAD);
119 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
120 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
123 u32 bi0 = to_next[0] = from[0];
124 u32 bi1 = to_next[1] = from[1];
130 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
131 vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
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);
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 void * underlay0 = vlib_buffer_get_current(b0);
184 void * underlay1 = vlib_buffer_get_current(b1);
186 /* vnet_rewrite_two_header writes only in (uword) 8 bytes chunks
187 * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite
188 * use memcpy as a workaround */
189 clib_memcpy(underlay0, t0->rewrite_header.data + rw_hdr_offset, underlay_hdr_len);
190 clib_memcpy(underlay1, t1->rewrite_header.data + rw_hdr_offset, underlay_hdr_len);
192 ip4_header_t * ip4_0, * ip4_1;
193 qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0;
194 ip6_header_t * ip6_0, * ip6_1;
195 udp_header_t * udp0, * udp1;
199 ip4_vxlan_header_t * hdr0 = underlay0;
200 ip4_vxlan_header_t * hdr1 = underlay1;
202 /* Fix the IP4 checksum and length */
205 ip4_0->length = clib_host_to_net_u16 (len0);
206 ip4_1->length = clib_host_to_net_u16 (len1);
208 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
210 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
211 ip4_0->tos = ip4_0_tos;
213 if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID))
215 ip4_1_tos = vnet_buffer2 (b1)->qos.bits;
216 ip4_1->tos = ip4_1_tos;
226 ip6_vxlan_header_t * hdr0 = underlay0;
227 ip6_vxlan_header_t * hdr1 = underlay1;
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)
324 u32 bi0 = to_next[0] = from[0];
330 vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
331 u32 flow_hash0 = vnet_l2_compute_flow_hash(b0);
333 /* Get next node index and adj index from tunnel next_dpo */
334 if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
336 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
337 vnet_hw_interface_t *hi0 =
338 vnet_get_sup_hw_interface (vnm, sw_if_index0);
339 t0 = &vxm->tunnels[hi0->dev_instance];
340 /* Note: change to always set next0 if it may be set to drop */
341 next0 = t0->next_dpo.dpoi_next_node;
342 dpoi_idx0 = t0->next_dpo.dpoi_index;
344 vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
346 ASSERT(t0->rewrite_header.data_bytes == underlay_hdr_len);
348 vlib_buffer_advance (b0, -underlay_hdr_len);
349 void * underlay0 = vlib_buffer_get_current(b0);
351 /* vnet_rewrite_one_header writes only in (uword) 8 bytes chunks
352 * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite
353 * use memcpy as a workaround */
354 clib_memcpy(underlay0, t0->rewrite_header.data + rw_hdr_offset, underlay_hdr_len);
356 u32 len0 = vlib_buffer_length_in_chain (vm, b0);
357 u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
360 ip4_header_t * ip4_0;
361 qos_bits_t ip4_0_tos = 0;
362 ip6_header_t * ip6_0;
366 ip4_vxlan_header_t * hdr = underlay0;
368 /* Fix the IP4 checksum and length */
370 ip4_0->length = clib_host_to_net_u16 (len0);
372 if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
374 ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
375 ip4_0->tos = ip4_0_tos;
383 ip6_vxlan_header_t * hdr = underlay0;
385 /* Fix IP6 payload length */
387 ip6_0->payload_length = payload_l0;
393 /* Fix UDP length and set source port */
394 udp0->length = payload_l0;
395 udp0->src_port = flow_hash0;
399 b0->flags |= csum_flags;
400 vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
401 vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
403 /* IPv4 UDP checksum only if checksum offload is used */
406 ip_csum_t sum0 = ip4_0->checksum;
407 sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
408 length /* changed member */);
409 if (PREDICT_FALSE (ip4_0_tos))
411 sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
412 tos /* changed member */);
414 ip4_0->checksum = ip_csum_fold (sum0);
416 /* IPv6 UDP checksum is mandatory */
421 udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
422 (vm, b0, ip6_0, &bogus);
424 if (udp0->checksum == 0)
425 udp0->checksum = 0xffff;
428 vlib_increment_combined_counter (tx_counter, thread_index,
429 sw_if_index0, 1, len0);
430 pkts_encapsulated ++;
432 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
434 vxlan_encap_trace_t *tr =
435 vlib_add_trace (vm, node, b0, sizeof (*tr));
436 tr->tunnel_index = t0 - vxm->tunnels;
439 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
440 to_next, n_left_to_next,
444 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
447 /* Do we still need this now that tunnel tx stats is kept? */
448 vlib_node_increment_counter (vm, node->node_index,
449 VXLAN_ENCAP_ERROR_ENCAPSULATED,
452 return from_frame->n_vectors;
456 vxlan4_encap (vlib_main_t * vm,
457 vlib_node_runtime_t * node,
458 vlib_frame_t * from_frame)
460 /* Disable chksum offload as setup overhead in tx node is not worthwhile
461 for ip4 header checksum only, unless udp checksum is also required */
462 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
463 /* csum_offload */ 0);
467 vxlan6_encap (vlib_main_t * vm,
468 vlib_node_runtime_t * node,
469 vlib_frame_t * from_frame)
471 /* Enable checksum offload for ip6 as udp checksum is mandatory, */
472 return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
473 /* csum_offload */ 1);
476 VLIB_REGISTER_NODE (vxlan4_encap_node) = {
477 .function = vxlan4_encap,
478 .name = "vxlan4-encap",
479 .vector_size = sizeof (u32),
480 .format_trace = format_vxlan_encap_trace,
481 .type = VLIB_NODE_TYPE_INTERNAL,
482 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
483 .error_strings = vxlan_encap_error_strings,
484 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
486 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
490 VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_encap_node, vxlan4_encap)
492 VLIB_REGISTER_NODE (vxlan6_encap_node) = {
493 .function = vxlan6_encap,
494 .name = "vxlan6-encap",
495 .vector_size = sizeof (u32),
496 .format_trace = format_vxlan_encap_trace,
497 .type = VLIB_NODE_TYPE_INTERNAL,
498 .n_errors = ARRAY_LEN(vxlan_encap_error_strings),
499 .error_strings = vxlan_encap_error_strings,
500 .n_next_nodes = VXLAN_ENCAP_N_NEXT,
502 [VXLAN_ENCAP_NEXT_DROP] = "error-drop",
506 VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)