Merge tag 'asoc-fix-v5.4-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / net / xfrm / xfrm_input.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT
2/*
3 * xfrm_input.c
4 *
5 * Changes:
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
a716c119 8 *
1da177e4
LT
9 */
10
acf568ee 11#include <linux/bottom_half.h>
f8c3d0dd 12#include <linux/cache.h>
acf568ee 13#include <linux/interrupt.h>
1da177e4
LT
14#include <linux/slab.h>
15#include <linux/module.h>
716062fd 16#include <linux/netdevice.h>
acf568ee 17#include <linux/percpu.h>
716062fd 18#include <net/dst.h>
1da177e4
LT
19#include <net/ip.h>
20#include <net/xfrm.h>
049f8e2e
AD
21#include <net/ip_tunnels.h>
22#include <net/ip6_tunnel.h>
1da177e4 23
b3284df1
FW
24#include "xfrm_inout.h"
25
acf568ee
HX
26struct xfrm_trans_tasklet {
27 struct tasklet_struct tasklet;
28 struct sk_buff_head queue;
29};
30
31struct xfrm_trans_cb {
9a3fb9fb
SK
32 union {
33 struct inet_skb_parm h4;
34#if IS_ENABLED(CONFIG_IPV6)
35 struct inet6_skb_parm h6;
36#endif
37 } header;
acf568ee
HX
38 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
39};
40
41#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
42
2f32b51b 43static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
960fdfde 44static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
2f32b51b 45
1995876a
SK
46static struct gro_cells gro_cells;
47static struct net_device xfrm_napi_dev;
48
acf568ee
HX
49static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
50
960fdfde 51int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b
SK
52{
53 int err = 0;
54
960fdfde 55 if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b 56 return -EAFNOSUPPORT;
960fdfde 57
2f32b51b
SK
58 spin_lock_bh(&xfrm_input_afinfo_lock);
59 if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
f31e8d4f 60 err = -EEXIST;
2f32b51b
SK
61 else
62 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
63 spin_unlock_bh(&xfrm_input_afinfo_lock);
64 return err;
65}
66EXPORT_SYMBOL(xfrm_input_register_afinfo);
67
960fdfde 68int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
2f32b51b
SK
69{
70 int err = 0;
71
2f32b51b
SK
72 spin_lock_bh(&xfrm_input_afinfo_lock);
73 if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
74 if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
75 err = -EINVAL;
76 else
77 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
78 }
79 spin_unlock_bh(&xfrm_input_afinfo_lock);
80 synchronize_rcu();
81 return err;
82}
83EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
84
960fdfde 85static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
2f32b51b 86{
960fdfde 87 const struct xfrm_input_afinfo *afinfo;
2f32b51b 88
960fdfde 89 if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
2f32b51b 90 return NULL;
960fdfde 91
2f32b51b
SK
92 rcu_read_lock();
93 afinfo = rcu_dereference(xfrm_input_afinfo[family]);
94 if (unlikely(!afinfo))
95 rcu_read_unlock();
96 return afinfo;
97}
98
2f32b51b
SK
99static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
100 int err)
101{
102 int ret;
960fdfde 103 const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
2f32b51b
SK
104
105 if (!afinfo)
106 return -EAFNOSUPPORT;
107
108 ret = afinfo->callback(skb, protocol, err);
960fdfde 109 rcu_read_unlock();
2f32b51b
SK
110
111 return ret;
112}
113
4165079b 114struct sec_path *secpath_set(struct sk_buff *skb)
1da177e4 115{
4165079b 116 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
1da177e4 117
4165079b 118 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
1da177e4
LT
119 if (!sp)
120 return NULL;
121
4165079b
FW
122 if (tmp) /* reused existing one (was COW'd if needed) */
123 return sp;
54ef207a 124
4165079b 125 /* allocated new secpath */
f1193e91 126 memset(sp->ovec, 0, sizeof(sp->ovec));
4165079b
FW
127 sp->olen = 0;
128 sp->len = 0;
0ca64da1
FW
129
130 return sp;
b0fcee82
SK
131}
132EXPORT_SYMBOL(secpath_set);
133
1da177e4
LT
134/* Fetch spi and seq from ipsec header */
135
6067b2ba 136int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
1da177e4
LT
137{
138 int offset, offset_seq;
44072500 139 int hlen;
1da177e4
LT
140
141 switch (nexthdr) {
142 case IPPROTO_AH:
44072500 143 hlen = sizeof(struct ip_auth_hdr);
1da177e4
LT
144 offset = offsetof(struct ip_auth_hdr, spi);
145 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
146 break;
147 case IPPROTO_ESP:
44072500 148 hlen = sizeof(struct ip_esp_hdr);
1da177e4
LT
149 offset = offsetof(struct ip_esp_hdr, spi);
150 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
151 break;
152 case IPPROTO_COMP:
153 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
154 return -EINVAL;
3e94c2dc 155 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
1da177e4
LT
156 *seq = 0;
157 return 0;
158 default:
159 return 1;
160 }
161
44072500 162 if (!pskb_may_pull(skb, hlen))
1da177e4
LT
163 return -EINVAL;
164
3e94c2dc
WC
165 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
166 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
1da177e4
LT
167 return 0;
168}
1e295370 169EXPORT_SYMBOL(xfrm_parse_spi);
1da177e4 170
b3284df1
FW
171static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
172{
173 struct iphdr *iph;
174 int optlen = 0;
175 int err = -EINVAL;
176
177 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
178 struct ip_beet_phdr *ph;
179 int phlen;
180
181 if (!pskb_may_pull(skb, sizeof(*ph)))
182 goto out;
183
184 ph = (struct ip_beet_phdr *)skb->data;
185
186 phlen = sizeof(*ph) + ph->padlen;
187 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
188 if (optlen < 0 || optlen & 3 || optlen > 250)
189 goto out;
190
191 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
192
193 if (!pskb_may_pull(skb, phlen))
194 goto out;
195 __skb_pull(skb, phlen);
196 }
197
198 skb_push(skb, sizeof(*iph));
199 skb_reset_network_header(skb);
200 skb_mac_header_rebuild(skb);
201
202 xfrm4_beet_make_header(skb);
203
204 iph = ip_hdr(skb);
205
206 iph->ihl += optlen / 4;
207 iph->tot_len = htons(skb->len);
208 iph->daddr = x->sel.daddr.a4;
209 iph->saddr = x->sel.saddr.a4;
210 iph->check = 0;
211 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
212 err = 0;
213out:
214 return err;
215}
216
217static void ipip_ecn_decapsulate(struct sk_buff *skb)
218{
219 struct iphdr *inner_iph = ipip_hdr(skb);
220
221 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
222 IP_ECN_set_ce(inner_iph);
223}
224
225static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
226{
227 int err = -EINVAL;
228
229 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
230 goto out;
231
232 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
233 goto out;
234
235 err = skb_unclone(skb, GFP_ATOMIC);
236 if (err)
237 goto out;
238
239 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
240 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
241 if (!(x->props.flags & XFRM_STATE_NOECN))
242 ipip_ecn_decapsulate(skb);
243
244 skb_reset_network_header(skb);
245 skb_mac_header_rebuild(skb);
246 if (skb->mac_len)
247 eth_hdr(skb)->h_proto = skb->protocol;
248
249 err = 0;
250
251out:
252 return err;
253}
254
255static void ipip6_ecn_decapsulate(struct sk_buff *skb)
256{
257 struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
258
259 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
260 IP6_ECN_set_ce(skb, inner_iph);
261}
262
263static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
264{
265 int err = -EINVAL;
266
267 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
268 goto out;
269 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
270 goto out;
271
272 err = skb_unclone(skb, GFP_ATOMIC);
273 if (err)
274 goto out;
275
276 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
277 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
278 ipipv6_hdr(skb));
279 if (!(x->props.flags & XFRM_STATE_NOECN))
280 ipip6_ecn_decapsulate(skb);
281
282 skb_reset_network_header(skb);
283 skb_mac_header_rebuild(skb);
284 if (skb->mac_len)
285 eth_hdr(skb)->h_proto = skb->protocol;
286
287 err = 0;
288
289out:
290 return err;
291}
292
293static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
294{
295 struct ipv6hdr *ip6h;
296 int size = sizeof(struct ipv6hdr);
297 int err;
298
299 err = skb_cow_head(skb, size + skb->mac_len);
300 if (err)
301 goto out;
302
303 __skb_push(skb, size);
304 skb_reset_network_header(skb);
305 skb_mac_header_rebuild(skb);
306
307 xfrm6_beet_make_header(skb);
308
309 ip6h = ipv6_hdr(skb);
310 ip6h->payload_len = htons(skb->len - size);
311 ip6h->daddr = x->sel.daddr.in6;
312 ip6h->saddr = x->sel.saddr.in6;
313 err = 0;
314out:
315 return err;
316}
317
318/* Remove encapsulation header.
319 *
320 * The IP header will be moved over the top of the encapsulation
321 * header.
322 *
323 * On entry, the transport header shall point to where the IP header
324 * should be and the network header shall be set to where the IP
325 * header currently is. skb->data shall point to the start of the
326 * payload.
327 */
328static int
329xfrm_inner_mode_encap_remove(struct xfrm_state *x,
330 const struct xfrm_mode *inner_mode,
331 struct sk_buff *skb)
332{
333 switch (inner_mode->encap) {
334 case XFRM_MODE_BEET:
335 if (inner_mode->family == AF_INET)
336 return xfrm4_remove_beet_encap(x, skb);
337 if (inner_mode->family == AF_INET6)
338 return xfrm6_remove_beet_encap(x, skb);
339 break;
340 case XFRM_MODE_TUNNEL:
341 if (inner_mode->family == AF_INET)
342 return xfrm4_remove_tunnel_encap(x, skb);
343 if (inner_mode->family == AF_INET6)
344 return xfrm6_remove_tunnel_encap(x, skb);
345 break;
346 }
347
348 WARN_ON_ONCE(1);
349 return -EOPNOTSUPP;
350}
351
c2d305e5 352static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
227620e2 353{
c9500d7b 354 const struct xfrm_mode *inner_mode = &x->inner_mode;
733a5fac
FW
355 const struct xfrm_state_afinfo *afinfo;
356 int err = -EAFNOSUPPORT;
227620e2 357
733a5fac 358 rcu_read_lock();
c9500d7b 359 afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
733a5fac
FW
360 if (likely(afinfo))
361 err = afinfo->extract_input(x, skb);
4c203b04 362 rcu_read_unlock();
733a5fac 363
4c203b04 364 if (err)
227620e2
HX
365 return err;
366
df9dcb45
KM
367 if (x->sel.family == AF_UNSPEC) {
368 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
4c203b04 369 if (!inner_mode)
df9dcb45
KM
370 return -EAFNOSUPPORT;
371 }
372
4c203b04
FW
373 switch (inner_mode->family) {
374 case AF_INET:
375 skb->protocol = htons(ETH_P_IP);
376 break;
377 case AF_INET6:
378 skb->protocol = htons(ETH_P_IPV6);
1be451d9 379 break;
4c203b04
FW
380 default:
381 WARN_ON_ONCE(1);
382 break;
733a5fac
FW
383 }
384
b3284df1 385 return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
227620e2 386}
c2d305e5
FW
387
388/* Remove encapsulation header.
389 *
390 * The IP header will be moved over the top of the encapsulation header.
391 *
392 * On entry, skb_transport_header() shall point to where the IP header
393 * should be and skb_network_header() shall be set to where the IP header
394 * currently is. skb->data shall point to the start of the payload.
395 */
396static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
397{
c2d305e5
FW
398 int ihl = skb->data - skb_transport_header(skb);
399
400 if (skb->transport_header != skb->network_header) {
401 memmove(skb_transport_header(skb),
402 skb_network_header(skb), ihl);
403 skb->network_header = skb->transport_header;
404 }
405 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
406 skb_reset_transport_header(skb);
407 return 0;
c2d305e5
FW
408}
409
410static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
411{
4c145dce 412#if IS_ENABLED(CONFIG_IPV6)
c2d305e5
FW
413 int ihl = skb->data - skb_transport_header(skb);
414
415 if (skb->transport_header != skb->network_header) {
416 memmove(skb_transport_header(skb),
417 skb_network_header(skb), ihl);
418 skb->network_header = skb->transport_header;
419 }
420 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
421 sizeof(struct ipv6hdr));
422 skb_reset_transport_header(skb);
423 return 0;
424#else
4c145dce
FW
425 WARN_ON_ONCE(1);
426 return -EAFNOSUPPORT;
c2d305e5
FW
427#endif
428}
429
430static int xfrm_inner_mode_input(struct xfrm_state *x,
431 const struct xfrm_mode *inner_mode,
432 struct sk_buff *skb)
433{
434 switch (inner_mode->encap) {
435 case XFRM_MODE_BEET:
436 case XFRM_MODE_TUNNEL:
437 return xfrm_prepare_input(x, skb);
438 case XFRM_MODE_TRANSPORT:
439 if (inner_mode->family == AF_INET)
440 return xfrm4_transport_input(x, skb);
441 if (inner_mode->family == AF_INET6)
442 return xfrm6_transport_input(x, skb);
443 break;
444 case XFRM_MODE_ROUTEOPTIMIZATION:
445 WARN_ON_ONCE(1);
446 break;
447 default:
448 WARN_ON_ONCE(1);
449 break;
450 }
451
452 return -EOPNOTSUPP;
453}
227620e2 454
716062fd
HX
455int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
456{
733a5fac 457 const struct xfrm_state_afinfo *afinfo;
bd235e3c 458 struct net *net = dev_net(skb->dev);
4c145dce 459 const struct xfrm_mode *inner_mode;
716062fd
HX
460 int err;
461 __be32 seq;
2cd08467 462 __be32 seq_hi;
3328715e 463 struct xfrm_state *x = NULL;
1bf06cd2 464 xfrm_address_t *daddr;
049f8e2e 465 u32 mark = skb->mark;
4ce3dbe3 466 unsigned int family = AF_UNSPEC;
716062fd 467 int decaps = 0;
1bf06cd2 468 int async = 0;
7785bba2 469 bool xfrm_gro = false;
d77e38e6
SK
470 bool crypto_done = false;
471 struct xfrm_offload *xo = xfrm_offload(skb);
0ca64da1 472 struct sec_path *sp;
1bf06cd2 473
1bf06cd2 474 if (encap_type < 0) {
00501121 475 x = xfrm_input_state(skb);
4ce3dbe3
AH
476
477 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
478 if (x->km.state == XFRM_STATE_ACQ)
479 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
480 else
481 XFRM_INC_STATS(net,
482 LINUX_MIB_XFRMINSTATEINVALID);
483 goto drop;
484 }
485
c9500d7b 486 family = x->outer_mode.family;
7785bba2
SK
487
488 /* An encap_type of -1 indicates async resumption. */
489 if (encap_type == -1) {
490 async = 1;
491 seq = XFRM_SKB_CB(skb)->seq.input.low;
492 goto resume;
493 }
bcd1f8a4 494
7785bba2
SK
495 /* encap_type < -1 indicates a GRO call. */
496 encap_type = 0;
497 seq = XFRM_SPI_SKB_CB(skb)->seq;
716062fd 498
bcd1f8a4
SK
499 if (xo && (xo->flags & CRYPTO_DONE)) {
500 crypto_done = true;
bcd1f8a4
SK
501 family = XFRM_SPI_SKB_CB(skb)->family;
502
503 if (!(xo->status & CRYPTO_SUCCESS)) {
504 if (xo->status &
505 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
506 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
507 CRYPTO_TUNNEL_AH_AUTH_FAILED |
508 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
509
510 xfrm_audit_state_icvfail(x, skb,
511 x->type->proto);
512 x->stats.integrity_failed++;
513 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
514 goto drop;
515 }
516
47ebcc0b
YK
517 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
518 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
519 goto drop;
520 }
521
bcd1f8a4 522 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
d77e38e6
SK
523 goto drop;
524 }
525
bcd1f8a4
SK
526 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
527 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
528 goto drop;
529 }
d77e38e6
SK
530 }
531
7785bba2 532 goto lock;
1bf06cd2 533 }
716062fd 534
3328715e
SK
535 family = XFRM_SPI_SKB_CB(skb)->family;
536
049f8e2e 537 /* if tunnel is present override skb->mark value with tunnel i_key */
1625f452
AK
538 switch (family) {
539 case AF_INET:
540 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
049f8e2e 541 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
1625f452
AK
542 break;
543 case AF_INET6:
544 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
049f8e2e 545 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
1625f452 546 break;
049f8e2e
AD
547 }
548
0ca64da1
FW
549 sp = secpath_set(skb);
550 if (!sp) {
b0fcee82
SK
551 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
552 goto drop;
b2aa5e9d
HX
553 }
554
716062fd 555 seq = 0;
0aa64774 556 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
f203b76d 557 secpath_reset(skb);
59c9940e 558 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd 559 goto drop;
0aa64774 560 }
716062fd 561
cb79a180
FW
562 daddr = (xfrm_address_t *)(skb_network_header(skb) +
563 XFRM_SPI_SKB_CB(skb)->daddroff);
716062fd 564 do {
2294be0f
FW
565 sp = skb_sec_path(skb);
566
567 if (sp->len == XFRM_MAX_DEPTH) {
f203b76d 568 secpath_reset(skb);
59c9940e 569 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
716062fd 570 goto drop;
0aa64774 571 }
716062fd 572
049f8e2e 573 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
0aa64774 574 if (x == NULL) {
f203b76d 575 secpath_reset(skb);
59c9940e 576 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
afeb14b4 577 xfrm_audit_state_notfound(skb, family, spi, seq);
716062fd 578 goto drop;
0aa64774 579 }
716062fd 580
9b42c1f1
SK
581 skb->mark = xfrm_smark_get(skb->mark, x);
582
2294be0f 583 sp->xvec[sp->len++] = x;
b2aa5e9d 584
0152eee6
SK
585 skb_dst_force(skb);
586 if (!skb_dst(skb)) {
587 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
588 goto drop;
589 }
590
7785bba2 591lock:
716062fd 592 spin_lock(&x->lock);
4c4d41f2 593
0aa64774 594 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
dc0565ce
LR
595 if (x->km.state == XFRM_STATE_ACQ)
596 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
597 else
598 XFRM_INC_STATS(net,
599 LINUX_MIB_XFRMINSTATEINVALID);
716062fd 600 goto drop_unlock;
0aa64774 601 }
716062fd 602
3de77cf2
DM
603 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
604 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
605 goto drop_unlock;
606 }
607
36ae0148 608 if (x->repl->check(x, skb, seq)) {
59c9940e 609 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
716062fd 610 goto drop_unlock;
0aa64774 611 }
716062fd 612
0aa64774 613 if (xfrm_state_check_expire(x)) {
59c9940e 614 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
716062fd 615 goto drop_unlock;
0aa64774 616 }
716062fd 617
0ebea8ef
HX
618 spin_unlock(&x->lock);
619
68c11e98
AD
620 if (xfrm_tunnel_check(skb, x, family)) {
621 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
622 goto drop;
623 }
624
2cd08467
SK
625 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
626
1ce3644a 627 XFRM_SKB_CB(skb)->seq.input.low = seq;
2cd08467 628 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
1bf06cd2 629
071d36bf 630 dev_hold(skb->dev);
3bc07321 631
d77e38e6
SK
632 if (crypto_done)
633 nexthdr = x->type_offload->input_tail(x, skb);
634 else
635 nexthdr = x->type->input(x, skb);
0ebea8ef 636
1bf06cd2
HX
637 if (nexthdr == -EINPROGRESS)
638 return 0;
1bf06cd2 639resume:
071d36bf 640 dev_put(skb->dev);
641
0ebea8ef 642 spin_lock(&x->lock);
668dc8af 643 if (nexthdr <= 0) {
9dd3245a
HX
644 if (nexthdr == -EBADMSG) {
645 xfrm_audit_state_icvfail(x, skb,
646 x->type->proto);
668dc8af 647 x->stats.integrity_failed++;
9dd3245a 648 }
59c9940e 649 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
716062fd 650 goto drop_unlock;
668dc8af 651 }
716062fd 652
716062fd
HX
653 /* only the first xfrm gets the encap type */
654 encap_type = 0;
655
3b59df46 656 if (async && x->repl->recheck(x, skb, seq)) {
bcf66bf5
SK
657 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
658 goto drop_unlock;
659 }
660
9fdc4883 661 x->repl->advance(x, seq);
716062fd
HX
662
663 x->curlft.bytes += skb->len;
664 x->curlft.packets++;
665
666 spin_unlock(&x->lock);
667
60d5fcfb
HX
668 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
669
c9500d7b 670 inner_mode = &x->inner_mode;
df9dcb45
KM
671
672 if (x->sel.family == AF_UNSPEC) {
673 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
cb866e32
SK
674 if (inner_mode == NULL) {
675 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
df9dcb45 676 goto drop;
cb866e32 677 }
df9dcb45
KM
678 }
679
c2d305e5 680 if (xfrm_inner_mode_input(x, inner_mode, skb)) {
59c9940e 681 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
716062fd 682 goto drop;
0aa64774 683 }
716062fd 684
c9500d7b 685 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
716062fd
HX
686 decaps = 1;
687 break;
688 }
689
1bf06cd2
HX
690 /*
691 * We need the inner address. However, we only get here for
692 * transport mode so the outer address is identical.
693 */
694 daddr = &x->id.daddr;
c9500d7b 695 family = x->outer_mode.family;
1bf06cd2 696
716062fd 697 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
0aa64774 698 if (err < 0) {
59c9940e 699 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
716062fd 700 goto drop;
0aa64774 701 }
782710e3 702 crypto_done = false;
716062fd
HX
703 } while (!err);
704
3328715e
SK
705 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
706 if (err)
707 goto drop;
708
716062fd
HX
709 nf_reset(skb);
710
711 if (decaps) {
2294be0f
FW
712 sp = skb_sec_path(skb);
713 if (sp)
714 sp->olen = 0;
adf30907 715 skb_dst_drop(skb);
1995876a 716 gro_cells_receive(&gro_cells, skb);
716062fd
HX
717 return 0;
718 } else {
7785bba2
SK
719 xo = xfrm_offload(skb);
720 if (xo)
721 xfrm_gro = xo->flags & XFRM_GRO;
722
733a5fac
FW
723 err = -EAFNOSUPPORT;
724 rcu_read_lock();
c9500d7b 725 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
733a5fac
FW
726 if (likely(afinfo))
727 err = afinfo->transport_finish(skb, xfrm_gro || async);
728 rcu_read_unlock();
7785bba2 729 if (xfrm_gro) {
2294be0f
FW
730 sp = skb_sec_path(skb);
731 if (sp)
732 sp->olen = 0;
7785bba2
SK
733 skb_dst_drop(skb);
734 gro_cells_receive(&gro_cells, skb);
735 return err;
736 }
737
738 return err;
716062fd
HX
739 }
740
741drop_unlock:
742 spin_unlock(&x->lock);
716062fd 743drop:
3328715e 744 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
716062fd
HX
745 kfree_skb(skb);
746 return 0;
747}
748EXPORT_SYMBOL(xfrm_input);
749
1bf06cd2
HX
750int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
751{
752 return xfrm_input(skb, nexthdr, 0, -1);
753}
754EXPORT_SYMBOL(xfrm_input_resume);
755
acf568ee
HX
756static void xfrm_trans_reinject(unsigned long data)
757{
758 struct xfrm_trans_tasklet *trans = (void *)data;
759 struct sk_buff_head queue;
760 struct sk_buff *skb;
761
762 __skb_queue_head_init(&queue);
763 skb_queue_splice_init(&trans->queue, &queue);
764
765 while ((skb = __skb_dequeue(&queue)))
766 XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb);
767}
768
769int xfrm_trans_queue(struct sk_buff *skb,
770 int (*finish)(struct net *, struct sock *,
771 struct sk_buff *))
772{
773 struct xfrm_trans_tasklet *trans;
774
775 trans = this_cpu_ptr(&xfrm_trans_tasklet);
776
777 if (skb_queue_len(&trans->queue) >= netdev_max_backlog)
778 return -ENOBUFS;
779
780 XFRM_TRANS_SKB_CB(skb)->finish = finish;
d16b46e4 781 __skb_queue_tail(&trans->queue, skb);
acf568ee
HX
782 tasklet_schedule(&trans->tasklet);
783 return 0;
784}
785EXPORT_SYMBOL(xfrm_trans_queue);
786
1da177e4
LT
787void __init xfrm_input_init(void)
788{
1995876a 789 int err;
acf568ee 790 int i;
1995876a
SK
791
792 init_dummy_netdev(&xfrm_napi_dev);
793 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
794 if (err)
795 gro_cells.cells = NULL;
796
acf568ee
HX
797 for_each_possible_cpu(i) {
798 struct xfrm_trans_tasklet *trans;
799
800 trans = &per_cpu(xfrm_trans_tasklet, i);
801 __skb_queue_head_init(&trans->queue);
802 tasklet_init(&trans->tasklet, xfrm_trans_reinject,
803 (unsigned long)trans);
804 }
1da177e4 805}