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 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
xfrm6_transport_input(struct xfrm_state * x,struct sk_buff * skb)403 static 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
xfrm_inner_mode_input(struct xfrm_state * x,struct sk_buff * skb)423 static 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
xfrm_input(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)447 int 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) {
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
489 /* encap_type < -1 indicates a GRO call. */
490 encap_type = 0;
491 seq = XFRM_SPI_SKB_CB(skb)->seq;
492
493 if (xo && (xo->flags & CRYPTO_DONE)) {
494 crypto_done = true;
495 family = XFRM_SPI_SKB_CB(skb)->family;
496
497 if (!(xo->status & CRYPTO_SUCCESS)) {
498 if (xo->status &
499 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
500 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
501 CRYPTO_TUNNEL_AH_AUTH_FAILED |
502 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
503
504 xfrm_audit_state_icvfail(x, skb,
505 x->type->proto);
506 x->stats.integrity_failed++;
507 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
508 goto drop;
509 }
510
511 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
512 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
513 goto drop;
514 }
515
516 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
517 goto drop;
518 }
519
520 if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
521 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
522 goto drop;
523 }
524 }
525
526 goto lock;
527 }
528
529 family = XFRM_SPI_SKB_CB(skb)->family;
530
531 /* if tunnel is present override skb->mark value with tunnel i_key */
532 switch (family) {
533 case AF_INET:
534 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
535 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
536 break;
537 case AF_INET6:
538 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
539 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
540 break;
541 }
542
543 sp = secpath_set(skb);
544 if (!sp) {
545 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
546 goto drop;
547 }
548
549 seq = 0;
550 if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
551 secpath_reset(skb);
552 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
553 goto drop;
554 }
555
556 daddr = (xfrm_address_t *)(skb_network_header(skb) +
557 XFRM_SPI_SKB_CB(skb)->daddroff);
558 do {
559 sp = skb_sec_path(skb);
560
561 if (sp->len == XFRM_MAX_DEPTH) {
562 secpath_reset(skb);
563 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
564 goto drop;
565 }
566
567 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
568 if (x == NULL) {
569 secpath_reset(skb);
570 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
571 xfrm_audit_state_notfound(skb, family, spi, seq);
572 goto drop;
573 }
574
575 skb->mark = xfrm_smark_get(skb->mark, x);
576
577 sp->xvec[sp->len++] = x;
578
579 skb_dst_force(skb);
580 if (!skb_dst(skb)) {
581 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
582 goto drop;
583 }
584
585 lock:
586 spin_lock(&x->lock);
587
588 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
589 if (x->km.state == XFRM_STATE_ACQ)
590 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
591 else
592 XFRM_INC_STATS(net,
593 LINUX_MIB_XFRMINSTATEINVALID);
594 goto drop_unlock;
595 }
596
597 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
598 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
599 goto drop_unlock;
600 }
601
602 if (xfrm_replay_check(x, skb, seq)) {
603 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
604 goto drop_unlock;
605 }
606
607 if (xfrm_state_check_expire(x)) {
608 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
609 goto drop_unlock;
610 }
611
612 spin_unlock(&x->lock);
613
614 if (xfrm_tunnel_check(skb, x, family)) {
615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
616 goto drop;
617 }
618
619 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
620
621 XFRM_SKB_CB(skb)->seq.input.low = seq;
622 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
623
624 dev_hold(skb->dev);
625
626 if (crypto_done)
627 nexthdr = x->type_offload->input_tail(x, skb);
628 else
629 nexthdr = x->type->input(x, skb);
630
631 if (nexthdr == -EINPROGRESS)
632 return 0;
633 resume:
634 dev_put(skb->dev);
635
636 spin_lock(&x->lock);
637 if (nexthdr < 0) {
638 if (nexthdr == -EBADMSG) {
639 xfrm_audit_state_icvfail(x, skb,
640 x->type->proto);
641 x->stats.integrity_failed++;
642 }
643 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
644 goto drop_unlock;
645 }
646
647 /* only the first xfrm gets the encap type */
648 encap_type = 0;
649
650 if (xfrm_replay_recheck(x, skb, seq)) {
651 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
652 goto drop_unlock;
653 }
654
655 xfrm_replay_advance(x, seq);
656
657 x->curlft.bytes += skb->len;
658 x->curlft.packets++;
659 x->lastused = ktime_get_real_seconds();
660
661 spin_unlock(&x->lock);
662
663 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
664
665 if (xfrm_inner_mode_input(x, skb)) {
666 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
667 goto drop;
668 }
669
670 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
671 decaps = 1;
672 break;
673 }
674
675 /*
676 * We need the inner address. However, we only get here for
677 * transport mode so the outer address is identical.
678 */
679 daddr = &x->id.daddr;
680 family = x->props.family;
681
682 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
683 if (err < 0) {
684 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
685 goto drop;
686 }
687 crypto_done = false;
688 } while (!err);
689
690 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
691 if (err)
692 goto drop;
693
694 nf_reset_ct(skb);
695
696 if (decaps) {
697 sp = skb_sec_path(skb);
698 if (sp)
699 sp->olen = 0;
700 if (skb_valid_dst(skb))
701 skb_dst_drop(skb);
702 gro_cells_receive(&gro_cells, skb);
703 return 0;
704 } else {
705 xo = xfrm_offload(skb);
706 if (xo)
707 xfrm_gro = xo->flags & XFRM_GRO;
708
709 err = -EAFNOSUPPORT;
710 rcu_read_lock();
711 afinfo = xfrm_state_afinfo_get_rcu(x->props.family);
712 if (likely(afinfo))
713 err = afinfo->transport_finish(skb, xfrm_gro || async);
714 rcu_read_unlock();
715 if (xfrm_gro) {
716 sp = skb_sec_path(skb);
717 if (sp)
718 sp->olen = 0;
719 if (skb_valid_dst(skb))
720 skb_dst_drop(skb);
721 gro_cells_receive(&gro_cells, skb);
722 return err;
723 }
724
725 return err;
726 }
727
728 drop_unlock:
729 spin_unlock(&x->lock);
730 drop:
731 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
732 kfree_skb(skb);
733 return 0;
734 }
735 EXPORT_SYMBOL(xfrm_input);
736
xfrm_input_resume(struct sk_buff * skb,int nexthdr)737 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
738 {
739 return xfrm_input(skb, nexthdr, 0, -1);
740 }
741 EXPORT_SYMBOL(xfrm_input_resume);
742
xfrm_trans_reinject(struct work_struct * work)743 static void xfrm_trans_reinject(struct work_struct *work)
744 {
745 struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work);
746 struct sk_buff_head queue;
747 struct sk_buff *skb;
748
749 __skb_queue_head_init(&queue);
750 spin_lock_bh(&trans->queue_lock);
751 skb_queue_splice_init(&trans->queue, &queue);
752 spin_unlock_bh(&trans->queue_lock);
753
754 local_bh_disable();
755 while ((skb = __skb_dequeue(&queue)))
756 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
757 NULL, skb);
758 local_bh_enable();
759 }
760
xfrm_trans_queue_net(struct net * net,struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))761 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
762 int (*finish)(struct net *, struct sock *,
763 struct sk_buff *))
764 {
765 struct xfrm_trans_tasklet *trans;
766
767 trans = this_cpu_ptr(&xfrm_trans_tasklet);
768
769 if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog))
770 return -ENOBUFS;
771
772 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
773
774 XFRM_TRANS_SKB_CB(skb)->finish = finish;
775 XFRM_TRANS_SKB_CB(skb)->net = net;
776 spin_lock_bh(&trans->queue_lock);
777 __skb_queue_tail(&trans->queue, skb);
778 spin_unlock_bh(&trans->queue_lock);
779 schedule_work(&trans->work);
780 return 0;
781 }
782 EXPORT_SYMBOL(xfrm_trans_queue_net);
783
xfrm_trans_queue(struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))784 int xfrm_trans_queue(struct sk_buff *skb,
785 int (*finish)(struct net *, struct sock *,
786 struct sk_buff *))
787 {
788 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
789 }
790 EXPORT_SYMBOL(xfrm_trans_queue);
791
xfrm_input_init(void)792 void __init xfrm_input_init(void)
793 {
794 int err;
795 int i;
796
797 init_dummy_netdev(&xfrm_napi_dev);
798 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
799 if (err)
800 gro_cells.cells = NULL;
801
802 for_each_possible_cpu(i) {
803 struct xfrm_trans_tasklet *trans;
804
805 trans = &per_cpu(xfrm_trans_tasklet, i);
806 spin_lock_init(&trans->queue_lock);
807 __skb_queue_head_init(&trans->queue);
808 INIT_WORK(&trans->work, xfrm_trans_reinject);
809 }
810 }
811
