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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm_input.c
4 *
5 * Changes:
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
8 *
9 */
10
11#include <linux/bottom_half.h>
12#include <linux/cache.h>
13#include <linux/interrupt.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/netdevice.h>
17#include <linux/percpu.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/xfrm.h>
21#include <net/ip_tunnels.h>
22#include <net/ip6_tunnel.h>
23#include <net/dst_metadata.h>
24#include <net/hotdata.h>
25
26#include "xfrm_inout.h"
27
28struct xfrm_trans_tasklet {
29 struct work_struct work;
30 spinlock_t queue_lock;
31 struct sk_buff_head queue;
32};
33
34struct xfrm_trans_cb {
35 union {
36 struct inet_skb_parm h4;
37#if IS_ENABLED(CONFIG_IPV6)
38 struct inet6_skb_parm h6;
39#endif
40 } header;
41 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
42 struct net *net;
43};
44
45#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
46
47static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
48static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1];
49
50static struct gro_cells gro_cells;
51static struct net_device xfrm_napi_dev;
52
53static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
54
55int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
56{
57 int err = 0;
58
59 if (WARN_ON(afinfo->family > AF_INET6))
60 return -EAFNOSUPPORT;
61
62 spin_lock_bh(&xfrm_input_afinfo_lock);
63 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family]))
64 err = -EEXIST;
65 else
66 rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo);
67 spin_unlock_bh(&xfrm_input_afinfo_lock);
68 return err;
69}
70EXPORT_SYMBOL(xfrm_input_register_afinfo);
71
72int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
73{
74 int err = 0;
75
76 spin_lock_bh(&xfrm_input_afinfo_lock);
77 if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) {
78 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo))
79 err = -EINVAL;
80 else
81 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL);
82 }
83 spin_unlock_bh(&xfrm_input_afinfo_lock);
84 synchronize_rcu();
85 return err;
86}
87EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
88
89static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip)
90{
91 const struct xfrm_input_afinfo *afinfo;
92
93 if (WARN_ON_ONCE(family > AF_INET6))
94 return NULL;
95
96 rcu_read_lock();
97 afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]);
98 if (unlikely(!afinfo))
99 rcu_read_unlock();
100 return afinfo;
101}
102
103static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
104 int err)
105{
106 bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6);
107 const struct xfrm_input_afinfo *afinfo;
108 int ret;
109
110 afinfo = xfrm_input_get_afinfo(family, is_ipip);
111 if (!afinfo)
112 return -EAFNOSUPPORT;
113
114 ret = afinfo->callback(skb, protocol, err);
115 rcu_read_unlock();
116
117 return ret;
118}
119
120struct sec_path *secpath_set(struct sk_buff *skb)
121{
122 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
123
124 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
125 if (!sp)
126 return NULL;
127
128 if (tmp) /* reused existing one (was COW'd if needed) */
129 return sp;
130
131 /* allocated new secpath */
132 memset(sp->ovec, 0, sizeof(sp->ovec));
133 sp->olen = 0;
134 sp->len = 0;
135 sp->verified_cnt = 0;
136
137 return sp;
138}
139EXPORT_SYMBOL(secpath_set);
140
141/* Fetch spi and seq from ipsec header */
142
143int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
144{
145 int offset, offset_seq;
146 int hlen;
147
148 switch (nexthdr) {
149 case IPPROTO_AH:
150 hlen = sizeof(struct ip_auth_hdr);
151 offset = offsetof(struct ip_auth_hdr, spi);
152 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
153 break;
154 case IPPROTO_ESP:
155 hlen = sizeof(struct ip_esp_hdr);
156 offset = offsetof(struct ip_esp_hdr, spi);
157 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
158 break;
159 case IPPROTO_COMP:
160 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
161 return -EINVAL;
162 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
163 *seq = 0;
164 return 0;
165 default:
166 return 1;
167 }
168
169 if (!pskb_may_pull(skb, hlen))
170 return -EINVAL;
171
172 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
173 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
174 return 0;
175}
176EXPORT_SYMBOL(xfrm_parse_spi);
177
178static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
179{
180 struct iphdr *iph;
181 int optlen = 0;
182 int err = -EINVAL;
183
184 skb->protocol = htons(ETH_P_IP);
185
186 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
187 struct ip_beet_phdr *ph;
188 int phlen;
189
190 if (!pskb_may_pull(skb, sizeof(*ph)))
191 goto out;
192
193 ph = (struct ip_beet_phdr *)skb->data;
194
195 phlen = sizeof(*ph) + ph->padlen;
196 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
197 if (optlen < 0 || optlen & 3 || optlen > 250)
198 goto out;
199
200 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
201
202 if (!pskb_may_pull(skb, phlen))
203 goto out;
204 __skb_pull(skb, phlen);
205 }
206
207 skb_push(skb, sizeof(*iph));
208 skb_reset_network_header(skb);
209 skb_mac_header_rebuild(skb);
210
211 xfrm4_beet_make_header(skb);
212
213 iph = ip_hdr(skb);
214
215 iph->ihl += optlen / 4;
216 iph->tot_len = htons(skb->len);
217 iph->daddr = x->sel.daddr.a4;
218 iph->saddr = x->sel.saddr.a4;
219 iph->check = 0;
220 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
221 err = 0;
222out:
223 return err;
224}
225
226static void ipip_ecn_decapsulate(struct sk_buff *skb)
227{
228 struct iphdr *inner_iph = ipip_hdr(skb);
229
230 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
231 IP_ECN_set_ce(inner_iph);
232}
233
234static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
235{
236 int err = -EINVAL;
237
238 skb->protocol = htons(ETH_P_IP);
239
240 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
241 goto out;
242
243 err = skb_unclone(skb, GFP_ATOMIC);
244 if (err)
245 goto out;
246
247 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
248 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
249 if (!(x->props.flags & XFRM_STATE_NOECN))
250 ipip_ecn_decapsulate(skb);
251
252 skb_reset_network_header(skb);
253 skb_mac_header_rebuild(skb);
254 if (skb->mac_len)
255 eth_hdr(skb)->h_proto = skb->protocol;
256
257 err = 0;
258
259out:
260 return err;
261}
262
263static void ipip6_ecn_decapsulate(struct sk_buff *skb)
264{
265 struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
266
267 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
268 IP6_ECN_set_ce(skb, inner_iph);
269}
270
271static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
272{
273 int err = -EINVAL;
274
275 skb->protocol = htons(ETH_P_IPV6);
276
277 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
278 goto out;
279
280 err = skb_unclone(skb, GFP_ATOMIC);
281 if (err)
282 goto out;
283
284 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
285 ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
286 if (!(x->props.flags & XFRM_STATE_NOECN))
287 ipip6_ecn_decapsulate(skb);
288
289 skb_reset_network_header(skb);
290 skb_mac_header_rebuild(skb);
291 if (skb->mac_len)
292 eth_hdr(skb)->h_proto = skb->protocol;
293
294 err = 0;
295
296out:
297 return err;
298}
299
300static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
301{
302 struct ipv6hdr *ip6h;
303 int size = sizeof(struct ipv6hdr);
304 int err;
305
306 skb->protocol = htons(ETH_P_IPV6);
307
308 err = skb_cow_head(skb, size + skb->mac_len);
309 if (err)
310 goto out;
311
312 __skb_push(skb, size);
313 skb_reset_network_header(skb);
314 skb_mac_header_rebuild(skb);
315
316 xfrm6_beet_make_header(skb);
317
318 ip6h = ipv6_hdr(skb);
319 ip6h->payload_len = htons(skb->len - size);
320 ip6h->daddr = x->sel.daddr.in6;
321 ip6h->saddr = x->sel.saddr.in6;
322 err = 0;
323out:
324 return err;
325}
326
327/* Remove encapsulation header.
328 *
329 * The IP header will be moved over the top of the encapsulation
330 * header.
331 *
332 * On entry, the transport header shall point to where the IP header
333 * should be and the network header shall be set to where the IP
334 * header currently is. skb->data shall point to the start of the
335 * payload.
336 */
337static int
338xfrm_inner_mode_encap_remove(struct xfrm_state *x,
339 struct sk_buff *skb)
340{
341 switch (x->props.mode) {
342 case XFRM_MODE_BEET:
343 switch (x->sel.family) {
344 case AF_INET:
345 return xfrm4_remove_beet_encap(x, skb);
346 case AF_INET6:
347 return xfrm6_remove_beet_encap(x, skb);
348 }
349 break;
350 case XFRM_MODE_TUNNEL:
351 switch (XFRM_MODE_SKB_CB(skb)->protocol) {
352 case IPPROTO_IPIP:
353 return xfrm4_remove_tunnel_encap(x, skb);
354 case IPPROTO_IPV6:
355 return xfrm6_remove_tunnel_encap(x, skb);
356 break;
357 }
358 return -EINVAL;
359 }
360
361 WARN_ON_ONCE(1);
362 return -EOPNOTSUPP;
363}
364
365static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
366{
367 switch (x->props.family) {
368 case AF_INET:
369 xfrm4_extract_header(skb);
370 break;
371 case AF_INET6:
372 xfrm6_extract_header(skb);
373 break;
374 default:
375 WARN_ON_ONCE(1);
376 return -EAFNOSUPPORT;
377 }
378
379 return xfrm_inner_mode_encap_remove(x, skb);
380}
381
382/* Remove encapsulation header.
383 *
384 * The IP header will be moved over the top of the encapsulation header.
385 *
386 * On entry, skb_transport_header() shall point to where the IP header
387 * should be and skb_network_header() shall be set to where the IP header
388 * currently is. skb->data shall point to the start of the payload.
389 */
390static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
391{
392 struct xfrm_offload *xo = xfrm_offload(skb);
393 int ihl = skb->data - skb_transport_header(skb);
394
395 if (skb->transport_header != skb->network_header) {
396 memmove(skb_transport_header(skb),
397 skb_network_header(skb), ihl);
398 if (xo)
399 xo->orig_mac_len =
400 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
401 skb->network_header = skb->transport_header;
402 }
403 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
404 skb_reset_transport_header(skb);
405 return 0;
406}
407
408static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
409{
410#if IS_ENABLED(CONFIG_IPV6)
411 struct xfrm_offload *xo = xfrm_offload(skb);
412 int ihl = skb->data - skb_transport_header(skb);
413
414 if (skb->transport_header != skb->network_header) {
415 memmove(skb_transport_header(skb),
416 skb_network_header(skb), ihl);
417 if (xo)
418 xo->orig_mac_len =
419 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
420 skb->network_header = skb->transport_header;
421 }
422 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
423 sizeof(struct ipv6hdr));
424 skb_reset_transport_header(skb);
425 return 0;
426#else
427 WARN_ON_ONCE(1);
428 return -EAFNOSUPPORT;
429#endif
430}
431
432static int xfrm_inner_mode_input(struct xfrm_state *x,
433 struct sk_buff *skb)
434{
435 switch (x->props.mode) {
436 case XFRM_MODE_BEET:
437 case XFRM_MODE_TUNNEL:
438 return xfrm_prepare_input(x, skb);
439 case XFRM_MODE_TRANSPORT:
440 if (x->props.family == AF_INET)
441 return xfrm4_transport_input(x, skb);
442 if (x->props.family == AF_INET6)
443 return xfrm6_transport_input(x, skb);
444 break;
445 case XFRM_MODE_ROUTEOPTIMIZATION:
446 WARN_ON_ONCE(1);
447 break;
448 default:
449 WARN_ON_ONCE(1);
450 break;
451 }
452
453 return -EOPNOTSUPP;
454}
455
456int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
457{
458 const struct xfrm_state_afinfo *afinfo;
459 struct net *net = dev_net(skb->dev);
460 int err;
461 __be32 seq;
462 __be32 seq_hi;
463 struct xfrm_state *x = NULL;
464 xfrm_address_t *daddr;
465 u32 mark = skb->mark;
466 unsigned int family = AF_UNSPEC;
467 int decaps = 0;
468 int async = 0;
469 bool xfrm_gro = false;
470 bool crypto_done = false;
471 struct xfrm_offload *xo = xfrm_offload(skb);
472 struct sec_path *sp;
473
474 if (encap_type < 0 || (xo && (xo->flags & XFRM_GRO || encap_type == 0 ||
475 encap_type == UDP_ENCAP_ESPINUDP))) {
476 x = xfrm_input_state(skb);
477
478 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
479 if (x->km.state == XFRM_STATE_ACQ)
480 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
481 else
482 XFRM_INC_STATS(net,
483 LINUX_MIB_XFRMINSTATEINVALID);
484
485 if (encap_type == -1)
486 dev_put(skb->dev);
487 goto drop;
488 }
489
490 family = x->props.family;
491
492 /* An encap_type of -1 indicates async resumption. */
493 if (encap_type == -1) {
494 async = 1;
495 seq = XFRM_SKB_CB(skb)->seq.input.low;
496 goto resume;
497 }
498 /* GRO call */
499 seq = XFRM_SPI_SKB_CB(skb)->seq;
500
501 if (xo && (xo->flags & CRYPTO_DONE)) {
502 crypto_done = true;
503 family = XFRM_SPI_SKB_CB(skb)->family;
504
505 if (!(xo->status & CRYPTO_SUCCESS)) {
506 if (xo->status &
507 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
508 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
509 CRYPTO_TUNNEL_AH_AUTH_FAILED |
510 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
511
512 xfrm_audit_state_icvfail(x, skb,
513 x->type->proto);
514 x->stats.integrity_failed++;
515 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
516 goto drop;
517 }
518
519 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
520 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
521 goto drop;
522 }
523
524 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
525 goto drop;
526 }
527
528 if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
529 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
530 goto drop;
531 }
532 }
533
534 goto lock;
535 }
536
537 family = XFRM_SPI_SKB_CB(skb)->family;
538
539 /* if tunnel is present override skb->mark value with tunnel i_key */
540 switch (family) {
541 case AF_INET:
542 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
543 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
544 break;
545 case AF_INET6:
546 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
547 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
548 break;
549 }
550
551 sp = secpath_set(skb);
552 if (!sp) {
553 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
554 goto drop;
555 }
556
557 seq = 0;
558 if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
559 secpath_reset(skb);
560 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
561 goto drop;
562 }
563
564 daddr = (xfrm_address_t *)(skb_network_header(skb) +
565 XFRM_SPI_SKB_CB(skb)->daddroff);
566 do {
567 sp = skb_sec_path(skb);
568
569 if (sp->len == XFRM_MAX_DEPTH) {
570 secpath_reset(skb);
571 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
572 goto drop;
573 }
574
575 x = xfrm_input_state_lookup(net, mark, daddr, spi, nexthdr, family);
576 if (x == NULL) {
577 secpath_reset(skb);
578 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
579 xfrm_audit_state_notfound(skb, family, spi, seq);
580 goto drop;
581 }
582
583 if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) {
584 secpath_reset(skb);
585 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEDIRERROR);
586 xfrm_audit_state_notfound(skb, family, spi, seq);
587 xfrm_state_put(x);
588 x = NULL;
589 goto drop;
590 }
591
592 skb->mark = xfrm_smark_get(skb->mark, x);
593
594 sp->xvec[sp->len++] = x;
595
596 skb_dst_force(skb);
597 if (!skb_dst(skb)) {
598 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
599 goto drop;
600 }
601
602lock:
603 spin_lock(&x->lock);
604
605 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
606 if (x->km.state == XFRM_STATE_ACQ)
607 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
608 else
609 XFRM_INC_STATS(net,
610 LINUX_MIB_XFRMINSTATEINVALID);
611 goto drop_unlock;
612 }
613
614 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
616 goto drop_unlock;
617 }
618
619 if (xfrm_replay_check(x, skb, seq)) {
620 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
621 goto drop_unlock;
622 }
623
624 if (xfrm_state_check_expire(x)) {
625 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
626 goto drop_unlock;
627 }
628
629 spin_unlock(&x->lock);
630
631 if (xfrm_tunnel_check(skb, x, family)) {
632 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
633 goto drop;
634 }
635
636 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
637
638 XFRM_SKB_CB(skb)->seq.input.low = seq;
639 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
640
641 dev_hold(skb->dev);
642
643 if (crypto_done)
644 nexthdr = x->type_offload->input_tail(x, skb);
645 else
646 nexthdr = x->type->input(x, skb);
647
648 if (nexthdr == -EINPROGRESS)
649 return 0;
650resume:
651 dev_put(skb->dev);
652
653 spin_lock(&x->lock);
654 if (nexthdr < 0) {
655 if (nexthdr == -EBADMSG) {
656 xfrm_audit_state_icvfail(x, skb,
657 x->type->proto);
658 x->stats.integrity_failed++;
659 }
660 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
661 goto drop_unlock;
662 }
663
664 /* only the first xfrm gets the encap type */
665 encap_type = 0;
666
667 if (xfrm_replay_recheck(x, skb, seq)) {
668 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
669 goto drop_unlock;
670 }
671
672 xfrm_replay_advance(x, seq);
673
674 x->curlft.bytes += skb->len;
675 x->curlft.packets++;
676 x->lastused = ktime_get_real_seconds();
677
678 spin_unlock(&x->lock);
679
680 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
681
682 if (xfrm_inner_mode_input(x, skb)) {
683 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
684 goto drop;
685 }
686
687 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
688 decaps = 1;
689 break;
690 }
691
692 /*
693 * We need the inner address. However, we only get here for
694 * transport mode so the outer address is identical.
695 */
696 daddr = &x->id.daddr;
697 family = x->props.family;
698
699 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
700 if (err < 0) {
701 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
702 goto drop;
703 }
704 crypto_done = false;
705 } while (!err);
706
707 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
708 if (err)
709 goto drop;
710
711 nf_reset_ct(skb);
712
713 if (decaps) {
714 sp = skb_sec_path(skb);
715 if (sp)
716 sp->olen = 0;
717 if (skb_valid_dst(skb))
718 skb_dst_drop(skb);
719 gro_cells_receive(&gro_cells, skb);
720 return 0;
721 } else {
722 xo = xfrm_offload(skb);
723 if (xo)
724 xfrm_gro = xo->flags & XFRM_GRO;
725
726 err = -EAFNOSUPPORT;
727 rcu_read_lock();
728 afinfo = xfrm_state_afinfo_get_rcu(x->props.family);
729 if (likely(afinfo))
730 err = afinfo->transport_finish(skb, xfrm_gro || async);
731 rcu_read_unlock();
732 if (xfrm_gro) {
733 sp = skb_sec_path(skb);
734 if (sp)
735 sp->olen = 0;
736 if (skb_valid_dst(skb))
737 skb_dst_drop(skb);
738 gro_cells_receive(&gro_cells, skb);
739 return err;
740 }
741
742 return err;
743 }
744
745drop_unlock:
746 spin_unlock(&x->lock);
747drop:
748 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
749 kfree_skb(skb);
750 return 0;
751}
752EXPORT_SYMBOL(xfrm_input);
753
754int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
755{
756 return xfrm_input(skb, nexthdr, 0, -1);
757}
758EXPORT_SYMBOL(xfrm_input_resume);
759
760static void xfrm_trans_reinject(struct work_struct *work)
761{
762 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work);
763 struct sk_buff_head queue;
764 struct sk_buff *skb;
765
766 __skb_queue_head_init(&queue);
767 spin_lock_bh(&trans->queue_lock);
768 skb_queue_splice_init(&trans->queue, &queue);
769 spin_unlock_bh(&trans->queue_lock);
770
771 local_bh_disable();
772 while ((skb = __skb_dequeue(&queue)))
773 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
774 NULL, skb);
775 local_bh_enable();
776}
777
778int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
779 int (*finish)(struct net *, struct sock *,
780 struct sk_buff *))
781{
782 struct xfrm_trans_tasklet *trans;
783
784 trans = this_cpu_ptr(&xfrm_trans_tasklet);
785
786 if (skb_queue_len(&trans->queue) >= READ_ONCE(net_hotdata.max_backlog))
787 return -ENOBUFS;
788
789 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
790
791 XFRM_TRANS_SKB_CB(skb)->finish = finish;
792 XFRM_TRANS_SKB_CB(skb)->net = net;
793 spin_lock_bh(&trans->queue_lock);
794 __skb_queue_tail(&trans->queue, skb);
795 spin_unlock_bh(&trans->queue_lock);
796 schedule_work(&trans->work);
797 return 0;
798}
799EXPORT_SYMBOL(xfrm_trans_queue_net);
800
801int xfrm_trans_queue(struct sk_buff *skb,
802 int (*finish)(struct net *, struct sock *,
803 struct sk_buff *))
804{
805 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
806}
807EXPORT_SYMBOL(xfrm_trans_queue);
808
809void __init xfrm_input_init(void)
810{
811 int err;
812 int i;
813
814 init_dummy_netdev(&xfrm_napi_dev);
815 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
816 if (err)
817 gro_cells.cells = NULL;
818
819 for_each_possible_cpu(i) {
820 struct xfrm_trans_tasklet *trans;
821
822 trans = &per_cpu(xfrm_trans_tasklet, i);
823 spin_lock_init(&trans->queue_lock);
824 __skb_queue_head_init(&trans->queue);
825 INIT_WORK(&trans->work, xfrm_trans_reinject);
826 }
827}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * xfrm_input.c
4 *
5 * Changes:
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
8 *
9 */
10
11#include <linux/bottom_half.h>
12#include <linux/cache.h>
13#include <linux/interrupt.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/netdevice.h>
17#include <linux/percpu.h>
18#include <net/dst.h>
19#include <net/ip.h>
20#include <net/xfrm.h>
21#include <net/ip_tunnels.h>
22#include <net/ip6_tunnel.h>
23#include <net/dst_metadata.h>
24
25#include "xfrm_inout.h"
26
27struct xfrm_trans_tasklet {
28 struct work_struct work;
29 spinlock_t queue_lock;
30 struct sk_buff_head queue;
31};
32
33struct xfrm_trans_cb {
34 union {
35 struct inet_skb_parm h4;
36#if IS_ENABLED(CONFIG_IPV6)
37 struct inet6_skb_parm h6;
38#endif
39 } header;
40 int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
41 struct net *net;
42};
43
44#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
45
46static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
47static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1];
48
49static struct gro_cells gro_cells;
50static struct net_device xfrm_napi_dev;
51
52static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
53
54int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
55{
56 int err = 0;
57
58 if (WARN_ON(afinfo->family > AF_INET6))
59 return -EAFNOSUPPORT;
60
61 spin_lock_bh(&xfrm_input_afinfo_lock);
62 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family]))
63 err = -EEXIST;
64 else
65 rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo);
66 spin_unlock_bh(&xfrm_input_afinfo_lock);
67 return err;
68}
69EXPORT_SYMBOL(xfrm_input_register_afinfo);
70
71int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
72{
73 int err = 0;
74
75 spin_lock_bh(&xfrm_input_afinfo_lock);
76 if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) {
77 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo))
78 err = -EINVAL;
79 else
80 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL);
81 }
82 spin_unlock_bh(&xfrm_input_afinfo_lock);
83 synchronize_rcu();
84 return err;
85}
86EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
87
88static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip)
89{
90 const struct xfrm_input_afinfo *afinfo;
91
92 if (WARN_ON_ONCE(family > AF_INET6))
93 return NULL;
94
95 rcu_read_lock();
96 afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]);
97 if (unlikely(!afinfo))
98 rcu_read_unlock();
99 return afinfo;
100}
101
102static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
103 int err)
104{
105 bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6);
106 const struct xfrm_input_afinfo *afinfo;
107 int ret;
108
109 afinfo = xfrm_input_get_afinfo(family, is_ipip);
110 if (!afinfo)
111 return -EAFNOSUPPORT;
112
113 ret = afinfo->callback(skb, protocol, err);
114 rcu_read_unlock();
115
116 return ret;
117}
118
119struct sec_path *secpath_set(struct sk_buff *skb)
120{
121 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
122
123 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
124 if (!sp)
125 return NULL;
126
127 if (tmp) /* reused existing one (was COW'd if needed) */
128 return sp;
129
130 /* allocated new secpath */
131 memset(sp->ovec, 0, sizeof(sp->ovec));
132 sp->olen = 0;
133 sp->len = 0;
134 sp->verified_cnt = 0;
135
136 return sp;
137}
138EXPORT_SYMBOL(secpath_set);
139
140/* Fetch spi and seq from ipsec header */
141
142int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
143{
144 int offset, offset_seq;
145 int hlen;
146
147 switch (nexthdr) {
148 case IPPROTO_AH:
149 hlen = sizeof(struct ip_auth_hdr);
150 offset = offsetof(struct ip_auth_hdr, spi);
151 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
152 break;
153 case IPPROTO_ESP:
154 hlen = sizeof(struct ip_esp_hdr);
155 offset = offsetof(struct ip_esp_hdr, spi);
156 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
157 break;
158 case IPPROTO_COMP:
159 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
160 return -EINVAL;
161 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
162 *seq = 0;
163 return 0;
164 default:
165 return 1;
166 }
167
168 if (!pskb_may_pull(skb, hlen))
169 return -EINVAL;
170
171 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
172 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
173 return 0;
174}
175EXPORT_SYMBOL(xfrm_parse_spi);
176
177static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
178{
179 struct iphdr *iph;
180 int optlen = 0;
181 int err = -EINVAL;
182
183 skb->protocol = htons(ETH_P_IP);
184
185 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
186 struct ip_beet_phdr *ph;
187 int phlen;
188
189 if (!pskb_may_pull(skb, sizeof(*ph)))
190 goto out;
191
192 ph = (struct ip_beet_phdr *)skb->data;
193
194 phlen = sizeof(*ph) + ph->padlen;
195 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
196 if (optlen < 0 || optlen & 3 || optlen > 250)
197 goto out;
198
199 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
200
201 if (!pskb_may_pull(skb, phlen))
202 goto out;
203 __skb_pull(skb, phlen);
204 }
205
206 skb_push(skb, sizeof(*iph));
207 skb_reset_network_header(skb);
208 skb_mac_header_rebuild(skb);
209
210 xfrm4_beet_make_header(skb);
211
212 iph = ip_hdr(skb);
213
214 iph->ihl += optlen / 4;
215 iph->tot_len = htons(skb->len);
216 iph->daddr = x->sel.daddr.a4;
217 iph->saddr = x->sel.saddr.a4;
218 iph->check = 0;
219 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
220 err = 0;
221out:
222 return err;
223}
224
225static void ipip_ecn_decapsulate(struct sk_buff *skb)
226{
227 struct iphdr *inner_iph = ipip_hdr(skb);
228
229 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
230 IP_ECN_set_ce(inner_iph);
231}
232
233static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
234{
235 int err = -EINVAL;
236
237 skb->protocol = htons(ETH_P_IP);
238
239 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
240 goto out;
241
242 err = skb_unclone(skb, GFP_ATOMIC);
243 if (err)
244 goto out;
245
246 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
247 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
248 if (!(x->props.flags & XFRM_STATE_NOECN))
249 ipip_ecn_decapsulate(skb);
250
251 skb_reset_network_header(skb);
252 skb_mac_header_rebuild(skb);
253 if (skb->mac_len)
254 eth_hdr(skb)->h_proto = skb->protocol;
255
256 err = 0;
257
258out:
259 return err;
260}
261
262static void ipip6_ecn_decapsulate(struct sk_buff *skb)
263{
264 struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
265
266 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
267 IP6_ECN_set_ce(skb, inner_iph);
268}
269
270static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
271{
272 int err = -EINVAL;
273
274 skb->protocol = htons(ETH_P_IPV6);
275
276 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
277 goto out;
278
279 err = skb_unclone(skb, GFP_ATOMIC);
280 if (err)
281 goto out;
282
283 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
284 ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
285 if (!(x->props.flags & XFRM_STATE_NOECN))
286 ipip6_ecn_decapsulate(skb);
287
288 skb_reset_network_header(skb);
289 skb_mac_header_rebuild(skb);
290 if (skb->mac_len)
291 eth_hdr(skb)->h_proto = skb->protocol;
292
293 err = 0;
294
295out:
296 return err;
297}
298
299static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
300{
301 struct ipv6hdr *ip6h;
302 int size = sizeof(struct ipv6hdr);
303 int err;
304
305 skb->protocol = htons(ETH_P_IPV6);
306
307 err = skb_cow_head(skb, size + skb->mac_len);
308 if (err)
309 goto out;
310
311 __skb_push(skb, size);
312 skb_reset_network_header(skb);
313 skb_mac_header_rebuild(skb);
314
315 xfrm6_beet_make_header(skb);
316
317 ip6h = ipv6_hdr(skb);
318 ip6h->payload_len = htons(skb->len - size);
319 ip6h->daddr = x->sel.daddr.in6;
320 ip6h->saddr = x->sel.saddr.in6;
321 err = 0;
322out:
323 return err;
324}
325
326/* Remove encapsulation header.
327 *
328 * The IP header will be moved over the top of the encapsulation
329 * header.
330 *
331 * On entry, the transport header shall point to where the IP header
332 * should be and the network header shall be set to where the IP
333 * header currently is. skb->data shall point to the start of the
334 * payload.
335 */
336static int
337xfrm_inner_mode_encap_remove(struct xfrm_state *x,
338 struct sk_buff *skb)
339{
340 switch (x->props.mode) {
341 case XFRM_MODE_BEET:
342 switch (x->sel.family) {
343 case AF_INET:
344 return xfrm4_remove_beet_encap(x, skb);
345 case AF_INET6:
346 return xfrm6_remove_beet_encap(x, skb);
347 }
348 break;
349 case XFRM_MODE_TUNNEL:
350 switch (XFRM_MODE_SKB_CB(skb)->protocol) {
351 case IPPROTO_IPIP:
352 return xfrm4_remove_tunnel_encap(x, skb);
353 case IPPROTO_IPV6:
354 return xfrm6_remove_tunnel_encap(x, skb);
355 break;
356 }
357 return -EINVAL;
358 }
359
360 WARN_ON_ONCE(1);
361 return -EOPNOTSUPP;
362}
363
364static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
365{
366 switch (x->props.family) {
367 case AF_INET:
368 xfrm4_extract_header(skb);
369 break;
370 case AF_INET6:
371 xfrm6_extract_header(skb);
372 break;
373 default:
374 WARN_ON_ONCE(1);
375 return -EAFNOSUPPORT;
376 }
377
378 return xfrm_inner_mode_encap_remove(x, skb);
379}
380
381/* Remove encapsulation header.
382 *
383 * The IP header will be moved over the top of the encapsulation header.
384 *
385 * On entry, skb_transport_header() shall point to where the IP header
386 * should be and skb_network_header() shall be set to where the IP header
387 * currently is. skb->data shall point to the start of the payload.
388 */
389static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
390{
391 int ihl = skb->data - skb_transport_header(skb);
392
393 if (skb->transport_header != skb->network_header) {
394 memmove(skb_transport_header(skb),
395 skb_network_header(skb), ihl);
396 skb->network_header = skb->transport_header;
397 }
398 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
399 skb_reset_transport_header(skb);
400 return 0;
401}
402
403static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
404{
405#if IS_ENABLED(CONFIG_IPV6)
406 int ihl = skb->data - skb_transport_header(skb);
407
408 if (skb->transport_header != skb->network_header) {
409 memmove(skb_transport_header(skb),
410 skb_network_header(skb), ihl);
411 skb->network_header = skb->transport_header;
412 }
413 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
414 sizeof(struct ipv6hdr));
415 skb_reset_transport_header(skb);
416 return 0;
417#else
418 WARN_ON_ONCE(1);
419 return -EAFNOSUPPORT;
420#endif
421}
422
423static int xfrm_inner_mode_input(struct xfrm_state *x,
424 struct sk_buff *skb)
425{
426 switch (x->props.mode) {
427 case XFRM_MODE_BEET:
428 case XFRM_MODE_TUNNEL:
429 return xfrm_prepare_input(x, skb);
430 case XFRM_MODE_TRANSPORT:
431 if (x->props.family == AF_INET)
432 return xfrm4_transport_input(x, skb);
433 if (x->props.family == AF_INET6)
434 return xfrm6_transport_input(x, skb);
435 break;
436 case XFRM_MODE_ROUTEOPTIMIZATION:
437 WARN_ON_ONCE(1);
438 break;
439 default:
440 WARN_ON_ONCE(1);
441 break;
442 }
443
444 return -EOPNOTSUPP;
445}
446
447int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
448{
449 const struct xfrm_state_afinfo *afinfo;
450 struct net *net = dev_net(skb->dev);
451 int err;
452 __be32 seq;
453 __be32 seq_hi;
454 struct xfrm_state *x = NULL;
455 xfrm_address_t *daddr;
456 u32 mark = skb->mark;
457 unsigned int family = AF_UNSPEC;
458 int decaps = 0;
459 int async = 0;
460 bool xfrm_gro = false;
461 bool crypto_done = false;
462 struct xfrm_offload *xo = xfrm_offload(skb);
463 struct sec_path *sp;
464
465 if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) {
466 x = xfrm_input_state(skb);
467
468 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
469 if (x->km.state == XFRM_STATE_ACQ)
470 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
471 else
472 XFRM_INC_STATS(net,
473 LINUX_MIB_XFRMINSTATEINVALID);
474
475 if (encap_type == -1)
476 dev_put(skb->dev);
477 goto drop;
478 }
479
480 family = x->props.family;
481
482 /* An encap_type of -1 indicates async resumption. */
483 if (encap_type == -1) {
484 async = 1;
485 seq = XFRM_SKB_CB(skb)->seq.input.low;
486 goto resume;
487 }
488 /* GRO call */
489 seq = XFRM_SPI_SKB_CB(skb)->seq;
490
491 if (xo && (xo->flags & CRYPTO_DONE)) {
492 crypto_done = true;
493 family = XFRM_SPI_SKB_CB(skb)->family;
494
495 if (!(xo->status & CRYPTO_SUCCESS)) {
496 if (xo->status &
497 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
498 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
499 CRYPTO_TUNNEL_AH_AUTH_FAILED |
500 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
501
502 xfrm_audit_state_icvfail(x, skb,
503 x->type->proto);
504 x->stats.integrity_failed++;
505 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
506 goto drop;
507 }
508
509 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
510 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
511 goto drop;
512 }
513
514 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
515 goto drop;
516 }
517
518 if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
519 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
520 goto drop;
521 }
522 }
523
524 goto lock;
525 }
526
527 family = XFRM_SPI_SKB_CB(skb)->family;
528
529 /* if tunnel is present override skb->mark value with tunnel i_key */
530 switch (family) {
531 case AF_INET:
532 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
533 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
534 break;
535 case AF_INET6:
536 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
537 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
538 break;
539 }
540
541 sp = secpath_set(skb);
542 if (!sp) {
543 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
544 goto drop;
545 }
546
547 seq = 0;
548 if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
549 secpath_reset(skb);
550 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
551 goto drop;
552 }
553
554 daddr = (xfrm_address_t *)(skb_network_header(skb) +
555 XFRM_SPI_SKB_CB(skb)->daddroff);
556 do {
557 sp = skb_sec_path(skb);
558
559 if (sp->len == XFRM_MAX_DEPTH) {
560 secpath_reset(skb);
561 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
562 goto drop;
563 }
564
565 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
566 if (x == NULL) {
567 secpath_reset(skb);
568 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
569 xfrm_audit_state_notfound(skb, family, spi, seq);
570 goto drop;
571 }
572
573 skb->mark = xfrm_smark_get(skb->mark, x);
574
575 sp->xvec[sp->len++] = x;
576
577 skb_dst_force(skb);
578 if (!skb_dst(skb)) {
579 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
580 goto drop;
581 }
582
583lock:
584 spin_lock(&x->lock);
585
586 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
587 if (x->km.state == XFRM_STATE_ACQ)
588 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
589 else
590 XFRM_INC_STATS(net,
591 LINUX_MIB_XFRMINSTATEINVALID);
592 goto drop_unlock;
593 }
594
595 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
596 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
597 goto drop_unlock;
598 }
599
600 if (xfrm_replay_check(x, skb, seq)) {
601 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
602 goto drop_unlock;
603 }
604
605 if (xfrm_state_check_expire(x)) {
606 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
607 goto drop_unlock;
608 }
609
610 spin_unlock(&x->lock);
611
612 if (xfrm_tunnel_check(skb, x, family)) {
613 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
614 goto drop;
615 }
616
617 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
618
619 XFRM_SKB_CB(skb)->seq.input.low = seq;
620 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
621
622 dev_hold(skb->dev);
623
624 if (crypto_done)
625 nexthdr = x->type_offload->input_tail(x, skb);
626 else
627 nexthdr = x->type->input(x, skb);
628
629 if (nexthdr == -EINPROGRESS)
630 return 0;
631resume:
632 dev_put(skb->dev);
633
634 spin_lock(&x->lock);
635 if (nexthdr < 0) {
636 if (nexthdr == -EBADMSG) {
637 xfrm_audit_state_icvfail(x, skb,
638 x->type->proto);
639 x->stats.integrity_failed++;
640 }
641 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
642 goto drop_unlock;
643 }
644
645 /* only the first xfrm gets the encap type */
646 encap_type = 0;
647
648 if (xfrm_replay_recheck(x, skb, seq)) {
649 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
650 goto drop_unlock;
651 }
652
653 xfrm_replay_advance(x, seq);
654
655 x->curlft.bytes += skb->len;
656 x->curlft.packets++;
657 x->lastused = ktime_get_real_seconds();
658
659 spin_unlock(&x->lock);
660
661 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
662
663 if (xfrm_inner_mode_input(x, skb)) {
664 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
665 goto drop;
666 }
667
668 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
669 decaps = 1;
670 break;
671 }
672
673 /*
674 * We need the inner address. However, we only get here for
675 * transport mode so the outer address is identical.
676 */
677 daddr = &x->id.daddr;
678 family = x->props.family;
679
680 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
681 if (err < 0) {
682 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
683 goto drop;
684 }
685 crypto_done = false;
686 } while (!err);
687
688 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
689 if (err)
690 goto drop;
691
692 nf_reset_ct(skb);
693
694 if (decaps) {
695 sp = skb_sec_path(skb);
696 if (sp)
697 sp->olen = 0;
698 if (skb_valid_dst(skb))
699 skb_dst_drop(skb);
700 gro_cells_receive(&gro_cells, skb);
701 return 0;
702 } else {
703 xo = xfrm_offload(skb);
704 if (xo)
705 xfrm_gro = xo->flags & XFRM_GRO;
706
707 err = -EAFNOSUPPORT;
708 rcu_read_lock();
709 afinfo = xfrm_state_afinfo_get_rcu(x->props.family);
710 if (likely(afinfo))
711 err = afinfo->transport_finish(skb, xfrm_gro || async);
712 rcu_read_unlock();
713 if (xfrm_gro) {
714 sp = skb_sec_path(skb);
715 if (sp)
716 sp->olen = 0;
717 if (skb_valid_dst(skb))
718 skb_dst_drop(skb);
719 gro_cells_receive(&gro_cells, skb);
720 return err;
721 }
722
723 return err;
724 }
725
726drop_unlock:
727 spin_unlock(&x->lock);
728drop:
729 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
730 kfree_skb(skb);
731 return 0;
732}
733EXPORT_SYMBOL(xfrm_input);
734
735int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
736{
737 return xfrm_input(skb, nexthdr, 0, -1);
738}
739EXPORT_SYMBOL(xfrm_input_resume);
740
741static void xfrm_trans_reinject(struct work_struct *work)
742{
743 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work);
744 struct sk_buff_head queue;
745 struct sk_buff *skb;
746
747 __skb_queue_head_init(&queue);
748 spin_lock_bh(&trans->queue_lock);
749 skb_queue_splice_init(&trans->queue, &queue);
750 spin_unlock_bh(&trans->queue_lock);
751
752 local_bh_disable();
753 while ((skb = __skb_dequeue(&queue)))
754 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
755 NULL, skb);
756 local_bh_enable();
757}
758
759int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
760 int (*finish)(struct net *, struct sock *,
761 struct sk_buff *))
762{
763 struct xfrm_trans_tasklet *trans;
764
765 trans = this_cpu_ptr(&xfrm_trans_tasklet);
766
767 if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog))
768 return -ENOBUFS;
769
770 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
771
772 XFRM_TRANS_SKB_CB(skb)->finish = finish;
773 XFRM_TRANS_SKB_CB(skb)->net = net;
774 spin_lock_bh(&trans->queue_lock);
775 __skb_queue_tail(&trans->queue, skb);
776 spin_unlock_bh(&trans->queue_lock);
777 schedule_work(&trans->work);
778 return 0;
779}
780EXPORT_SYMBOL(xfrm_trans_queue_net);
781
782int xfrm_trans_queue(struct sk_buff *skb,
783 int (*finish)(struct net *, struct sock *,
784 struct sk_buff *))
785{
786 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
787}
788EXPORT_SYMBOL(xfrm_trans_queue);
789
790void __init xfrm_input_init(void)
791{
792 int err;
793 int i;
794
795 init_dummy_netdev(&xfrm_napi_dev);
796 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
797 if (err)
798 gro_cells.cells = NULL;
799
800 for_each_possible_cpu(i) {
801 struct xfrm_trans_tasklet *trans;
802
803 trans = &per_cpu(xfrm_trans_tasklet, i);
804 spin_lock_init(&trans->queue_lock);
805 __skb_queue_head_init(&trans->queue);
806 INIT_WORK(&trans->work, xfrm_trans_reinject);
807 }
808}