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
27 struct xfrm_trans_tasklet {
28 struct work_struct work;
29 spinlock_t queue_lock;
30 struct sk_buff_head queue;
31 };
32
33 struct 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
46 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
47 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1];
48
49 static struct gro_cells gro_cells;
50 static struct net_device xfrm_napi_dev;
51
52 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
53
xfrm_input_register_afinfo(const struct xfrm_input_afinfo * afinfo)54 int 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 }
69 EXPORT_SYMBOL(xfrm_input_register_afinfo);
70
xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo * afinfo)71 int 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 }
86 EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
87
xfrm_input_get_afinfo(u8 family,bool is_ipip)88 static 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
xfrm_rcv_cb(struct sk_buff * skb,unsigned int family,u8 protocol,int err)102 static 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
secpath_set(struct sk_buff * skb)119 struct 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 }
138 EXPORT_SYMBOL(secpath_set);
139
140 /* Fetch spi and seq from ipsec header */
141
xfrm_parse_spi(struct sk_buff * skb,u8 nexthdr,__be32 * spi,__be32 * seq)142 int 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 }
175 EXPORT_SYMBOL(xfrm_parse_spi);
176
xfrm4_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)177 static 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;
221 out:
222 return err;
223 }
224
ipip_ecn_decapsulate(struct sk_buff * skb)225 static 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
xfrm4_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)233 static 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
258 out:
259 return err;
260 }
261
ipip6_ecn_decapsulate(struct sk_buff * skb)262 static 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
xfrm6_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)270 static 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
295 out:
296 return err;
297 }
298
xfrm6_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)299 static 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;
322 out:
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 */
336 static int
xfrm_inner_mode_encap_remove(struct xfrm_state * x,struct sk_buff * skb)337 xfrm_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
xfrm_prepare_input(struct xfrm_state * x,struct sk_buff * skb)364 static 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 */
xfrm4_transport_input(struct xfrm_state * x,struct sk_buff * skb)389 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
390 {
391 struct xfrm_offload *xo = xfrm_offload(skb);
392 int ihl = skb->data - skb_transport_header(skb);
393
394 if (skb->transport_header != skb->network_header) {
395 memmove(skb_transport_header(skb),
396 skb_network_header(skb), ihl);
397 if (xo)
398 xo->orig_mac_len =
399 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
400 skb->network_header = skb->transport_header;
401 }
402 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
403 skb_reset_transport_header(skb);
404 return 0;
405 }
406
xfrm6_transport_input(struct xfrm_state * x,struct sk_buff * skb)407 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
408 {
409 #if IS_ENABLED(CONFIG_IPV6)
410 struct xfrm_offload *xo = xfrm_offload(skb);
411 int ihl = skb->data - skb_transport_header(skb);
412
413 if (skb->transport_header != skb->network_header) {
414 memmove(skb_transport_header(skb),
415 skb_network_header(skb), ihl);
416 if (xo)
417 xo->orig_mac_len =
418 skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
419 skb->network_header = skb->transport_header;
420 }
421 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
422 sizeof(struct ipv6hdr));
423 skb_reset_transport_header(skb);
424 return 0;
425 #else
426 WARN_ON_ONCE(1);
427 return -EAFNOSUPPORT;
428 #endif
429 }
430
xfrm_inner_mode_input(struct xfrm_state * x,struct sk_buff * skb)431 static int xfrm_inner_mode_input(struct xfrm_state *x,
432 struct sk_buff *skb)
433 {
434 switch (x->props.mode) {
435 case XFRM_MODE_BEET:
436 case XFRM_MODE_TUNNEL:
437 return xfrm_prepare_input(x, skb);
438 case XFRM_MODE_TRANSPORT:
439 if (x->props.family == AF_INET)
440 return xfrm4_transport_input(x, skb);
441 if (x->props.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 }
454
xfrm_input(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)455 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
456 {
457 const struct xfrm_state_afinfo *afinfo;
458 struct net *net = dev_net(skb->dev);
459 int err;
460 __be32 seq;
461 __be32 seq_hi;
462 struct xfrm_state *x = NULL;
463 xfrm_address_t *daddr;
464 u32 mark = skb->mark;
465 unsigned int family = AF_UNSPEC;
466 int decaps = 0;
467 int async = 0;
468 bool xfrm_gro = false;
469 bool crypto_done = false;
470 struct xfrm_offload *xo = xfrm_offload(skb);
471 struct sec_path *sp;
472
473 if (encap_type < 0) {
474 x = xfrm_input_state(skb);
475
476 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
477 if (x->km.state == XFRM_STATE_ACQ)
478 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
479 else
480 XFRM_INC_STATS(net,
481 LINUX_MIB_XFRMINSTATEINVALID);
482
483 if (encap_type == -1)
484 dev_put(skb->dev);
485 goto drop;
486 }
487
488 family = x->props.family;
489
490 /* An encap_type of -1 indicates async resumption. */
491 if (encap_type == -1) {
492 async = 1;
493 seq = XFRM_SKB_CB(skb)->seq.input.low;
494 goto resume;
495 }
496
497 /* encap_type < -1 indicates a GRO call. */
498 encap_type = 0;
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_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 skb->mark = xfrm_smark_get(skb->mark, x);
584
585 sp->xvec[sp->len++] = x;
586
587 skb_dst_force(skb);
588 if (!skb_dst(skb)) {
589 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
590 goto drop;
591 }
592
593 lock:
594 spin_lock(&x->lock);
595
596 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
597 if (x->km.state == XFRM_STATE_ACQ)
598 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
599 else
600 XFRM_INC_STATS(net,
601 LINUX_MIB_XFRMINSTATEINVALID);
602 goto drop_unlock;
603 }
604
605 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
606 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
607 goto drop_unlock;
608 }
609
610 if (xfrm_replay_check(x, skb, seq)) {
611 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
612 goto drop_unlock;
613 }
614
615 if (xfrm_state_check_expire(x)) {
616 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
617 goto drop_unlock;
618 }
619
620 spin_unlock(&x->lock);
621
622 if (xfrm_tunnel_check(skb, x, family)) {
623 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
624 goto drop;
625 }
626
627 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
628
629 XFRM_SKB_CB(skb)->seq.input.low = seq;
630 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
631
632 dev_hold(skb->dev);
633
634 if (crypto_done)
635 nexthdr = x->type_offload->input_tail(x, skb);
636 else
637 nexthdr = x->type->input(x, skb);
638
639 if (nexthdr == -EINPROGRESS)
640 return 0;
641 resume:
642 dev_put(skb->dev);
643
644 spin_lock(&x->lock);
645 if (nexthdr < 0) {
646 if (nexthdr == -EBADMSG) {
647 xfrm_audit_state_icvfail(x, skb,
648 x->type->proto);
649 x->stats.integrity_failed++;
650 }
651 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
652 goto drop_unlock;
653 }
654
655 /* only the first xfrm gets the encap type */
656 encap_type = 0;
657
658 if (xfrm_replay_recheck(x, skb, seq)) {
659 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
660 goto drop_unlock;
661 }
662
663 xfrm_replay_advance(x, seq);
664
665 x->curlft.bytes += skb->len;
666 x->curlft.packets++;
667 x->lastused = ktime_get_real_seconds();
668
669 spin_unlock(&x->lock);
670
671 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
672
673 if (xfrm_inner_mode_input(x, skb)) {
674 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
675 goto drop;
676 }
677
678 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
679 decaps = 1;
680 break;
681 }
682
683 /*
684 * We need the inner address. However, we only get here for
685 * transport mode so the outer address is identical.
686 */
687 daddr = &x->id.daddr;
688 family = x->props.family;
689
690 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
691 if (err < 0) {
692 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
693 goto drop;
694 }
695 crypto_done = false;
696 } while (!err);
697
698 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
699 if (err)
700 goto drop;
701
702 nf_reset_ct(skb);
703
704 if (decaps) {
705 sp = skb_sec_path(skb);
706 if (sp)
707 sp->olen = 0;
708 if (skb_valid_dst(skb))
709 skb_dst_drop(skb);
710 gro_cells_receive(&gro_cells, skb);
711 return 0;
712 } else {
713 xo = xfrm_offload(skb);
714 if (xo)
715 xfrm_gro = xo->flags & XFRM_GRO;
716
717 err = -EAFNOSUPPORT;
718 rcu_read_lock();
719 afinfo = xfrm_state_afinfo_get_rcu(x->props.family);
720 if (likely(afinfo))
721 err = afinfo->transport_finish(skb, xfrm_gro || async);
722 rcu_read_unlock();
723 if (xfrm_gro) {
724 sp = skb_sec_path(skb);
725 if (sp)
726 sp->olen = 0;
727 if (skb_valid_dst(skb))
728 skb_dst_drop(skb);
729 gro_cells_receive(&gro_cells, skb);
730 return err;
731 }
732
733 return err;
734 }
735
736 drop_unlock:
737 spin_unlock(&x->lock);
738 drop:
739 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
740 kfree_skb(skb);
741 return 0;
742 }
743 EXPORT_SYMBOL(xfrm_input);
744
xfrm_input_resume(struct sk_buff * skb,int nexthdr)745 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
746 {
747 return xfrm_input(skb, nexthdr, 0, -1);
748 }
749 EXPORT_SYMBOL(xfrm_input_resume);
750
xfrm_trans_reinject(struct work_struct * work)751 static void xfrm_trans_reinject(struct work_struct *work)
752 {
753 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work);
754 struct sk_buff_head queue;
755 struct sk_buff *skb;
756
757 __skb_queue_head_init(&queue);
758 spin_lock_bh(&trans->queue_lock);
759 skb_queue_splice_init(&trans->queue, &queue);
760 spin_unlock_bh(&trans->queue_lock);
761
762 local_bh_disable();
763 while ((skb = __skb_dequeue(&queue)))
764 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
765 NULL, skb);
766 local_bh_enable();
767 }
768
xfrm_trans_queue_net(struct net * net,struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))769 int xfrm_trans_queue_net(struct net *net, 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) >= READ_ONCE(netdev_max_backlog))
778 return -ENOBUFS;
779
780 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
781
782 XFRM_TRANS_SKB_CB(skb)->finish = finish;
783 XFRM_TRANS_SKB_CB(skb)->net = net;
784 spin_lock_bh(&trans->queue_lock);
785 __skb_queue_tail(&trans->queue, skb);
786 spin_unlock_bh(&trans->queue_lock);
787 schedule_work(&trans->work);
788 return 0;
789 }
790 EXPORT_SYMBOL(xfrm_trans_queue_net);
791
xfrm_trans_queue(struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))792 int xfrm_trans_queue(struct sk_buff *skb,
793 int (*finish)(struct net *, struct sock *,
794 struct sk_buff *))
795 {
796 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
797 }
798 EXPORT_SYMBOL(xfrm_trans_queue);
799
xfrm_input_init(void)800 void __init xfrm_input_init(void)
801 {
802 int err;
803 int i;
804
805 init_dummy_netdev(&xfrm_napi_dev);
806 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
807 if (err)
808 gro_cells.cells = NULL;
809
810 for_each_possible_cpu(i) {
811 struct xfrm_trans_tasklet *trans;
812
813 trans = &per_cpu(xfrm_trans_tasklet, i);
814 spin_lock_init(&trans->queue_lock);
815 __skb_queue_head_init(&trans->queue);
816 INIT_WORK(&trans->work, xfrm_trans_reinject);
817 }
818 }
819