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
24 #include "xfrm_inout.h"
25
26 struct xfrm_trans_tasklet {
27 struct tasklet_struct tasklet;
28 struct sk_buff_head queue;
29 };
30
31 struct xfrm_trans_cb {
32 union {
33 struct inet_skb_parm h4;
34 #if IS_ENABLED(CONFIG_IPV6)
35 struct inet6_skb_parm h6;
36 #endif
37 } header;
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
43 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
44 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
45
46 static struct gro_cells gro_cells;
47 static struct net_device xfrm_napi_dev;
48
49 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
50
xfrm_input_register_afinfo(const struct xfrm_input_afinfo * afinfo)51 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
52 {
53 int err = 0;
54
55 if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
56 return -EAFNOSUPPORT;
57
58 spin_lock_bh(&xfrm_input_afinfo_lock);
59 if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
60 err = -EEXIST;
61 else
62 rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
63 spin_unlock_bh(&xfrm_input_afinfo_lock);
64 return err;
65 }
66 EXPORT_SYMBOL(xfrm_input_register_afinfo);
67
xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo * afinfo)68 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
69 {
70 int err = 0;
71
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 }
83 EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
84
xfrm_input_get_afinfo(unsigned int family)85 static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
86 {
87 const struct xfrm_input_afinfo *afinfo;
88
89 if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
90 return NULL;
91
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
xfrm_rcv_cb(struct sk_buff * skb,unsigned int family,u8 protocol,int err)99 static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
100 int err)
101 {
102 int ret;
103 const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
104
105 if (!afinfo)
106 return -EAFNOSUPPORT;
107
108 ret = afinfo->callback(skb, protocol, err);
109 rcu_read_unlock();
110
111 return ret;
112 }
113
secpath_set(struct sk_buff * skb)114 struct sec_path *secpath_set(struct sk_buff *skb)
115 {
116 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
117
118 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
119 if (!sp)
120 return NULL;
121
122 if (tmp) /* reused existing one (was COW'd if needed) */
123 return sp;
124
125 /* allocated new secpath */
126 memset(sp->ovec, 0, sizeof(sp->ovec));
127 sp->olen = 0;
128 sp->len = 0;
129
130 return sp;
131 }
132 EXPORT_SYMBOL(secpath_set);
133
134 /* Fetch spi and seq from ipsec header */
135
xfrm_parse_spi(struct sk_buff * skb,u8 nexthdr,__be32 * spi,__be32 * seq)136 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
137 {
138 int offset, offset_seq;
139 int hlen;
140
141 switch (nexthdr) {
142 case IPPROTO_AH:
143 hlen = sizeof(struct ip_auth_hdr);
144 offset = offsetof(struct ip_auth_hdr, spi);
145 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
146 break;
147 case IPPROTO_ESP:
148 hlen = sizeof(struct ip_esp_hdr);
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;
155 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
156 *seq = 0;
157 return 0;
158 default:
159 return 1;
160 }
161
162 if (!pskb_may_pull(skb, hlen))
163 return -EINVAL;
164
165 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
166 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
167 return 0;
168 }
169 EXPORT_SYMBOL(xfrm_parse_spi);
170
xfrm4_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)171 static 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;
213 out:
214 return err;
215 }
216
ipip_ecn_decapsulate(struct sk_buff * skb)217 static 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
xfrm4_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)225 static 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
251 out:
252 return err;
253 }
254
ipip6_ecn_decapsulate(struct sk_buff * skb)255 static 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
xfrm6_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)263 static 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(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
278 if (!(x->props.flags & XFRM_STATE_NOECN))
279 ipip6_ecn_decapsulate(skb);
280
281 skb_reset_network_header(skb);
282 skb_mac_header_rebuild(skb);
283 if (skb->mac_len)
284 eth_hdr(skb)->h_proto = skb->protocol;
285
286 err = 0;
287
288 out:
289 return err;
290 }
291
xfrm6_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)292 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
293 {
294 struct ipv6hdr *ip6h;
295 int size = sizeof(struct ipv6hdr);
296 int err;
297
298 err = skb_cow_head(skb, size + skb->mac_len);
299 if (err)
300 goto out;
301
302 __skb_push(skb, size);
303 skb_reset_network_header(skb);
304 skb_mac_header_rebuild(skb);
305
306 xfrm6_beet_make_header(skb);
307
308 ip6h = ipv6_hdr(skb);
309 ip6h->payload_len = htons(skb->len - size);
310 ip6h->daddr = x->sel.daddr.in6;
311 ip6h->saddr = x->sel.saddr.in6;
312 err = 0;
313 out:
314 return err;
315 }
316
317 /* Remove encapsulation header.
318 *
319 * The IP header will be moved over the top of the encapsulation
320 * header.
321 *
322 * On entry, the transport header shall point to where the IP header
323 * should be and the network header shall be set to where the IP
324 * header currently is. skb->data shall point to the start of the
325 * payload.
326 */
327 static int
xfrm_inner_mode_encap_remove(struct xfrm_state * x,const struct xfrm_mode * inner_mode,struct sk_buff * skb)328 xfrm_inner_mode_encap_remove(struct xfrm_state *x,
329 const struct xfrm_mode *inner_mode,
330 struct sk_buff *skb)
331 {
332 switch (inner_mode->encap) {
333 case XFRM_MODE_BEET:
334 if (inner_mode->family == AF_INET)
335 return xfrm4_remove_beet_encap(x, skb);
336 if (inner_mode->family == AF_INET6)
337 return xfrm6_remove_beet_encap(x, skb);
338 break;
339 case XFRM_MODE_TUNNEL:
340 if (inner_mode->family == AF_INET)
341 return xfrm4_remove_tunnel_encap(x, skb);
342 if (inner_mode->family == AF_INET6)
343 return xfrm6_remove_tunnel_encap(x, skb);
344 break;
345 }
346
347 WARN_ON_ONCE(1);
348 return -EOPNOTSUPP;
349 }
350
xfrm_prepare_input(struct xfrm_state * x,struct sk_buff * skb)351 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
352 {
353 const struct xfrm_mode *inner_mode = &x->inner_mode;
354 const struct xfrm_state_afinfo *afinfo;
355 int err = -EAFNOSUPPORT;
356
357 rcu_read_lock();
358 afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
359 if (likely(afinfo))
360 err = afinfo->extract_input(x, skb);
361 rcu_read_unlock();
362
363 if (err)
364 return err;
365
366 if (x->sel.family == AF_UNSPEC) {
367 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
368 if (!inner_mode)
369 return -EAFNOSUPPORT;
370 }
371
372 switch (inner_mode->family) {
373 case AF_INET:
374 skb->protocol = htons(ETH_P_IP);
375 break;
376 case AF_INET6:
377 skb->protocol = htons(ETH_P_IPV6);
378 break;
379 default:
380 WARN_ON_ONCE(1);
381 break;
382 }
383
384 return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
385 }
386
387 /* Remove encapsulation header.
388 *
389 * The IP header will be moved over the top of the encapsulation header.
390 *
391 * On entry, skb_transport_header() shall point to where the IP header
392 * should be and skb_network_header() shall be set to where the IP header
393 * currently is. skb->data shall point to the start of the payload.
394 */
xfrm4_transport_input(struct xfrm_state * x,struct sk_buff * skb)395 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
396 {
397 int ihl = skb->data - skb_transport_header(skb);
398
399 if (skb->transport_header != skb->network_header) {
400 memmove(skb_transport_header(skb),
401 skb_network_header(skb), ihl);
402 skb->network_header = skb->transport_header;
403 }
404 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
405 skb_reset_transport_header(skb);
406 return 0;
407 }
408
xfrm6_transport_input(struct xfrm_state * x,struct sk_buff * skb)409 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
410 {
411 #if IS_ENABLED(CONFIG_IPV6)
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 skb->network_header = skb->transport_header;
418 }
419 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
420 sizeof(struct ipv6hdr));
421 skb_reset_transport_header(skb);
422 return 0;
423 #else
424 WARN_ON_ONCE(1);
425 return -EAFNOSUPPORT;
426 #endif
427 }
428
xfrm_inner_mode_input(struct xfrm_state * x,const struct xfrm_mode * inner_mode,struct sk_buff * skb)429 static int xfrm_inner_mode_input(struct xfrm_state *x,
430 const struct xfrm_mode *inner_mode,
431 struct sk_buff *skb)
432 {
433 switch (inner_mode->encap) {
434 case XFRM_MODE_BEET:
435 case XFRM_MODE_TUNNEL:
436 return xfrm_prepare_input(x, skb);
437 case XFRM_MODE_TRANSPORT:
438 if (inner_mode->family == AF_INET)
439 return xfrm4_transport_input(x, skb);
440 if (inner_mode->family == AF_INET6)
441 return xfrm6_transport_input(x, skb);
442 break;
443 case XFRM_MODE_ROUTEOPTIMIZATION:
444 WARN_ON_ONCE(1);
445 break;
446 default:
447 WARN_ON_ONCE(1);
448 break;
449 }
450
451 return -EOPNOTSUPP;
452 }
453
xfrm_input(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)454 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
455 {
456 const struct xfrm_state_afinfo *afinfo;
457 struct net *net = dev_net(skb->dev);
458 const struct xfrm_mode *inner_mode;
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->outer_mode.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 ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
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 && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
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 (x->repl->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 (x->repl->recheck(x, skb, seq)) {
659 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
660 goto drop_unlock;
661 }
662
663 x->repl->advance(x, seq);
664
665 x->curlft.bytes += skb->len;
666 x->curlft.packets++;
667
668 spin_unlock(&x->lock);
669
670 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
671
672 inner_mode = &x->inner_mode;
673
674 if (x->sel.family == AF_UNSPEC) {
675 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
676 if (inner_mode == NULL) {
677 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
678 goto drop;
679 }
680 }
681
682 if (xfrm_inner_mode_input(x, inner_mode, 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->outer_mode.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 skb_dst_drop(skb);
718 gro_cells_receive(&gro_cells, skb);
719 return 0;
720 } else {
721 xo = xfrm_offload(skb);
722 if (xo)
723 xfrm_gro = xo->flags & XFRM_GRO;
724
725 err = -EAFNOSUPPORT;
726 rcu_read_lock();
727 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
728 if (likely(afinfo))
729 err = afinfo->transport_finish(skb, xfrm_gro || async);
730 rcu_read_unlock();
731 if (xfrm_gro) {
732 sp = skb_sec_path(skb);
733 if (sp)
734 sp->olen = 0;
735 skb_dst_drop(skb);
736 gro_cells_receive(&gro_cells, skb);
737 return err;
738 }
739
740 return err;
741 }
742
743 drop_unlock:
744 spin_unlock(&x->lock);
745 drop:
746 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
747 kfree_skb(skb);
748 return 0;
749 }
750 EXPORT_SYMBOL(xfrm_input);
751
xfrm_input_resume(struct sk_buff * skb,int nexthdr)752 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
753 {
754 return xfrm_input(skb, nexthdr, 0, -1);
755 }
756 EXPORT_SYMBOL(xfrm_input_resume);
757
xfrm_trans_reinject(unsigned long data)758 static void xfrm_trans_reinject(unsigned long data)
759 {
760 struct xfrm_trans_tasklet *trans = (void *)data;
761 struct sk_buff_head queue;
762 struct sk_buff *skb;
763
764 __skb_queue_head_init(&queue);
765 skb_queue_splice_init(&trans->queue, &queue);
766
767 while ((skb = __skb_dequeue(&queue)))
768 XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb);
769 }
770
xfrm_trans_queue(struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))771 int xfrm_trans_queue(struct sk_buff *skb,
772 int (*finish)(struct net *, struct sock *,
773 struct sk_buff *))
774 {
775 struct xfrm_trans_tasklet *trans;
776
777 trans = this_cpu_ptr(&xfrm_trans_tasklet);
778
779 if (skb_queue_len(&trans->queue) >= netdev_max_backlog)
780 return -ENOBUFS;
781
782 XFRM_TRANS_SKB_CB(skb)->finish = finish;
783 __skb_queue_tail(&trans->queue, skb);
784 tasklet_schedule(&trans->tasklet);
785 return 0;
786 }
787 EXPORT_SYMBOL(xfrm_trans_queue);
788
xfrm_input_init(void)789 void __init xfrm_input_init(void)
790 {
791 int err;
792 int i;
793
794 init_dummy_netdev(&xfrm_napi_dev);
795 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
796 if (err)
797 gro_cells.cells = NULL;
798
799 for_each_possible_cpu(i) {
800 struct xfrm_trans_tasklet *trans;
801
802 trans = &per_cpu(xfrm_trans_tasklet, i);
803 __skb_queue_head_init(&trans->queue);
804 tasklet_init(&trans->tasklet, xfrm_trans_reinject,
805 (unsigned long)trans);
806 }
807 }
808