2 * ipsec_output.c : IPSec output node
4 * Copyright (c) 2015 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 <vnet/vnet.h>
19 #include <vnet/api_errno.h>
20 #include <vnet/ip/ip.h>
22 #include <vnet/ipsec/ipsec.h>
23 #include <vnet/ipsec/ipsec_io.h>
27 #define foreach_ipsec_output_error \
28 _(RX_PKTS, "IPSec pkts received") \
29 _(POLICY_DISCARD, "IPSec policy discard") \
30 _(POLICY_NO_MATCH, "IPSec policy (no match)") \
31 _(POLICY_PROTECT, "IPSec policy protect") \
32 _(POLICY_BYPASS, "IPSec policy bypass") \
33 _(ENCAPS_FAILED, "IPSec encapsulation failed")
37 #define _(sym,str) IPSEC_OUTPUT_ERROR_##sym,
38 foreach_ipsec_output_error
41 } ipsec_output_error_t;
43 static char *ipsec_output_error_strings[] = {
44 #define _(sym,string) string,
45 foreach_ipsec_output_error
53 } ipsec_output_trace_t;
55 /* packet trace format function */
57 format_ipsec_output_trace (u8 * s, va_list * args)
59 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
60 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
61 ipsec_output_trace_t *t = va_arg (*args, ipsec_output_trace_t *);
63 s = format (s, "spd %u policy %d", t->spd_id, t->policy_id);
68 always_inline ipsec_policy_t *
69 ipsec_output_policy_match (ipsec_spd_t * spd, u8 pr, u32 la, u32 ra, u16 lp,
72 ipsec_main_t *im = &ipsec_main;
79 vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_OUTBOUND])
81 p = pool_elt_at_index (im->policies, *i);
82 if (PREDICT_FALSE (p->protocol && (p->protocol != pr)))
85 if (ra < p->raddr.start.ip4.as_u32)
88 if (ra > p->raddr.stop.ip4.as_u32)
91 if (la < p->laddr.start.ip4.as_u32)
94 if (la > p->laddr.stop.ip4.as_u32)
98 ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP)
99 && (pr != IP_PROTOCOL_SCTP)))
102 if (lp < p->lport.start)
105 if (lp > p->lport.stop)
108 if (rp < p->rport.start)
111 if (rp > p->rport.stop)
120 ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
123 if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
124 (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
129 always_inline ipsec_policy_t *
130 ipsec6_output_policy_match (ipsec_spd_t * spd,
132 ip6_address_t * ra, u16 lp, u16 rp, u8 pr)
134 ipsec_main_t *im = &ipsec_main;
141 vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP6_OUTBOUND])
143 p = pool_elt_at_index (im->policies, *i);
144 if (PREDICT_FALSE (p->protocol && (p->protocol != pr)))
147 if (!ip6_addr_match_range (ra, &p->raddr.start.ip6, &p->raddr.stop.ip6))
150 if (!ip6_addr_match_range (la, &p->laddr.start.ip6, &p->laddr.stop.ip6))
154 ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP)
155 && (pr != IP_PROTOCOL_SCTP)))
158 if (lp < p->lport.start)
161 if (lp > p->lport.stop)
164 if (rp < p->rport.start)
167 if (rp > p->rport.stop)
177 ipsec_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
178 vlib_frame_t * from_frame, int is_ipv6)
180 ipsec_main_t *im = &ipsec_main;
182 u32 *from, *to_next = 0, thread_index;
183 u32 n_left_from, sw_if_index0, last_sw_if_index = (u32) ~ 0;
184 u32 next_node_index = (u32) ~ 0, last_next_node_index = (u32) ~ 0;
187 ipsec_spd_t *spd0 = 0;
189 u64 nc_protect = 0, nc_bypass = 0, nc_discard = 0, nc_nomatch = 0;
191 from = vlib_frame_vector_args (from_frame);
192 n_left_from = from_frame->n_vectors;
193 thread_index = vm->thread_index;
195 while (n_left_from > 0)
201 ip6_header_t *ip6_0 = 0;
208 b0 = vlib_get_buffer (vm, bi0);
209 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
210 iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
211 ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
214 /* lookup for SPD only if sw_if_index is changed */
215 if (PREDICT_FALSE (last_sw_if_index != sw_if_index0))
217 uword *p = hash_get (im->spd_index_by_sw_if_index, sw_if_index0);
220 spd0 = pool_elt_at_index (im->spds, spd_index0);
221 last_sw_if_index = sw_if_index0;
226 ip6_0 = (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b0)
229 udp0 = ip6_next_header (ip6_0);
232 ("packet received from %U port %u to %U port %u spd_id %u",
233 format_ip6_address, &ip6_0->src_address,
234 clib_net_to_host_u16 (udp0->src_port), format_ip6_address,
235 &ip6_0->dst_address, clib_net_to_host_u16 (udp0->dst_port),
239 p0 = ipsec6_output_policy_match (spd0,
243 udp0->dst_port, ip6_0->protocol);
247 udp0 = (udp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
250 clib_warning ("packet received from %U to %U port %u",
251 format_ip4_address, ip0->src_address.as_u8,
252 format_ip4_address, ip0->dst_address.as_u8,
253 clib_net_to_host_u16 (udp0->dst_port));
254 clib_warning ("sw_if_index0 %u spd_index0 %u spd_id %u",
255 sw_if_index0, spd_index0, spd0->id);
258 p0 = ipsec_output_policy_match (spd0, ip0->protocol,
259 ip0->src_address.as_u32,
260 ip0->dst_address.as_u32,
261 udp0->src_port, udp0->dst_port);
263 tcp0 = (void *) udp0;
265 if (PREDICT_TRUE (p0 != NULL))
267 pi0 = p0 - im->policies;
269 vlib_prefetch_combined_counter (&ipsec_spd_policy_counters,
274 bytes0 = clib_net_to_host_u16 (ip6_0->payload_length);
275 bytes0 += sizeof (ip6_header_t);
279 bytes0 = clib_net_to_host_u16 (ip0->length);
282 if (p0->policy == IPSEC_POLICY_ACTION_PROTECT)
286 sa = pool_elt_at_index (im->sad, p0->sa_index);
287 if (sa->protocol == IPSEC_PROTOCOL_ESP)
289 next_node_index = im->esp6_encrypt_node_index;
291 next_node_index = im->esp4_encrypt_node_index;
293 next_node_index = im->ah6_encrypt_node_index;
295 next_node_index = im->ah4_encrypt_node_index;
296 vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
301 (b0->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM))
304 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0,
306 b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
309 (b0->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
312 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0,
314 b0->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
319 if (b0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
321 ip0->checksum = ip4_header_checksum (ip0);
322 b0->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
325 (b0->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM))
328 ip4_tcp_udp_compute_checksum (vm, b0, ip0);
329 b0->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
332 (b0->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
335 ip4_tcp_udp_compute_checksum (vm, b0, ip0);
336 b0->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
339 vlib_buffer_advance (b0, iph_offset);
341 else if (p0->policy == IPSEC_POLICY_ACTION_BYPASS)
344 next_node_index = get_next_output_feature_node_index (b0, node);
349 next_node_index = im->error_drop_node_index;
351 vlib_increment_combined_counter
352 (&ipsec_spd_policy_counters, thread_index, pi0, 1, bytes0);
358 next_node_index = im->error_drop_node_index;
364 if (PREDICT_FALSE ((last_next_node_index != next_node_index) || f == 0))
366 /* if this is not 1st frame */
368 vlib_put_frame_to_node (vm, last_next_node_index, f);
370 last_next_node_index = next_node_index;
372 f = vlib_get_frame_to_node (vm, next_node_index);
374 /* frame->frame_flags, copy it from node */
375 /* Copy trace flag from next_frame and from runtime. */
376 f->frame_flags |= node->flags & VLIB_NODE_FLAG_TRACE;
378 to_next = vlib_frame_vector_args (f);
385 if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
386 PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
388 ipsec_output_trace_t *tr =
389 vlib_add_trace (vm, node, b0, sizeof (*tr));
391 tr->spd_id = spd0->id;
396 vlib_put_frame_to_node (vm, next_node_index, f);
397 vlib_node_increment_counter (vm, node->node_index,
398 IPSEC_OUTPUT_ERROR_POLICY_PROTECT, nc_protect);
399 vlib_node_increment_counter (vm, node->node_index,
400 IPSEC_OUTPUT_ERROR_POLICY_BYPASS, nc_bypass);
401 vlib_node_increment_counter (vm, node->node_index,
402 IPSEC_OUTPUT_ERROR_POLICY_DISCARD, nc_discard);
403 vlib_node_increment_counter (vm, node->node_index,
404 IPSEC_OUTPUT_ERROR_POLICY_NO_MATCH,
406 return from_frame->n_vectors;
409 VLIB_NODE_FN (ipsec4_output_node) (vlib_main_t * vm,
410 vlib_node_runtime_t * node,
411 vlib_frame_t * frame)
413 return ipsec_output_inline (vm, node, frame, 0);
417 VLIB_REGISTER_NODE (ipsec4_output_node) = {
418 .name = "ipsec4-output-feature",
419 .vector_size = sizeof (u32),
420 .format_trace = format_ipsec_output_trace,
421 .type = VLIB_NODE_TYPE_INTERNAL,
423 .n_errors = ARRAY_LEN(ipsec_output_error_strings),
424 .error_strings = ipsec_output_error_strings,
426 .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
428 #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
429 foreach_ipsec_output_next
435 VLIB_NODE_FN (ipsec6_output_node) (vlib_main_t * vm,
436 vlib_node_runtime_t * node,
437 vlib_frame_t * frame)
439 return ipsec_output_inline (vm, node, frame, 1);
443 VLIB_REGISTER_NODE (ipsec6_output_node) = {
444 .name = "ipsec6-output-feature",
445 .vector_size = sizeof (u32),
446 .format_trace = format_ipsec_output_trace,
447 .type = VLIB_NODE_TYPE_INTERNAL,
449 .n_errors = ARRAY_LEN(ipsec_output_error_strings),
450 .error_strings = ipsec_output_error_strings,
452 .n_next_nodes = IPSEC_OUTPUT_N_NEXT,
454 #define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n,
455 foreach_ipsec_output_next
461 #else /* IPSEC > 1 */
463 /* Dummy ipsec output node, in case when IPSec is disabled */
466 ipsec_output_node_fn (vlib_main_t * vm,
467 vlib_node_runtime_t * node, vlib_frame_t * frame)
469 clib_warning ("IPSec disabled");
474 VLIB_REGISTER_NODE (ipsec4_output_node) = {
475 .vector_size = sizeof (u32),
476 .function = ipsec_output_node_fn,
477 .name = "ipsec4-output-feature",
480 VLIB_REGISTER_NODE (ipsec6_output_node) = {
481 .vector_size = sizeof (u32),
482 .function = ipsec_output_node_fn,
483 .name = "ipsec6-output-feature",
489 * fd.io coding-style-patch-verification: ON
492 * eval: (c-set-style "gnu")