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 struct net *net;
40 };
41
42 #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
43
44 static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
45 static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1];
46
47 static struct gro_cells gro_cells;
48 static struct net_device xfrm_napi_dev;
49
50 static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
51
xfrm_input_register_afinfo(const struct xfrm_input_afinfo * afinfo)52 int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
53 {
54 int err = 0;
55
56 if (WARN_ON(afinfo->family > AF_INET6))
57 return -EAFNOSUPPORT;
58
59 spin_lock_bh(&xfrm_input_afinfo_lock);
60 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family]))
61 err = -EEXIST;
62 else
63 rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo);
64 spin_unlock_bh(&xfrm_input_afinfo_lock);
65 return err;
66 }
67 EXPORT_SYMBOL(xfrm_input_register_afinfo);
68
xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo * afinfo)69 int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
70 {
71 int err = 0;
72
73 spin_lock_bh(&xfrm_input_afinfo_lock);
74 if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) {
75 if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo))
76 err = -EINVAL;
77 else
78 RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL);
79 }
80 spin_unlock_bh(&xfrm_input_afinfo_lock);
81 synchronize_rcu();
82 return err;
83 }
84 EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
85
xfrm_input_get_afinfo(u8 family,bool is_ipip)86 static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip)
87 {
88 const struct xfrm_input_afinfo *afinfo;
89
90 if (WARN_ON_ONCE(family > AF_INET6))
91 return NULL;
92
93 rcu_read_lock();
94 afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]);
95 if (unlikely(!afinfo))
96 rcu_read_unlock();
97 return afinfo;
98 }
99
xfrm_rcv_cb(struct sk_buff * skb,unsigned int family,u8 protocol,int err)100 static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
101 int err)
102 {
103 bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6);
104 const struct xfrm_input_afinfo *afinfo;
105 int ret;
106
107 afinfo = xfrm_input_get_afinfo(family, is_ipip);
108 if (!afinfo)
109 return -EAFNOSUPPORT;
110
111 ret = afinfo->callback(skb, protocol, err);
112 rcu_read_unlock();
113
114 return ret;
115 }
116
secpath_set(struct sk_buff * skb)117 struct sec_path *secpath_set(struct sk_buff *skb)
118 {
119 struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
120
121 sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
122 if (!sp)
123 return NULL;
124
125 if (tmp) /* reused existing one (was COW'd if needed) */
126 return sp;
127
128 /* allocated new secpath */
129 memset(sp->ovec, 0, sizeof(sp->ovec));
130 sp->olen = 0;
131 sp->len = 0;
132
133 return sp;
134 }
135 EXPORT_SYMBOL(secpath_set);
136
137 /* Fetch spi and seq from ipsec header */
138
xfrm_parse_spi(struct sk_buff * skb,u8 nexthdr,__be32 * spi,__be32 * seq)139 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
140 {
141 int offset, offset_seq;
142 int hlen;
143
144 switch (nexthdr) {
145 case IPPROTO_AH:
146 hlen = sizeof(struct ip_auth_hdr);
147 offset = offsetof(struct ip_auth_hdr, spi);
148 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
149 break;
150 case IPPROTO_ESP:
151 hlen = sizeof(struct ip_esp_hdr);
152 offset = offsetof(struct ip_esp_hdr, spi);
153 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
154 break;
155 case IPPROTO_COMP:
156 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
157 return -EINVAL;
158 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
159 *seq = 0;
160 return 0;
161 default:
162 return 1;
163 }
164
165 if (!pskb_may_pull(skb, hlen))
166 return -EINVAL;
167
168 *spi = *(__be32 *)(skb_transport_header(skb) + offset);
169 *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
170 return 0;
171 }
172 EXPORT_SYMBOL(xfrm_parse_spi);
173
xfrm4_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)174 static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
175 {
176 struct iphdr *iph;
177 int optlen = 0;
178 int err = -EINVAL;
179
180 if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
181 struct ip_beet_phdr *ph;
182 int phlen;
183
184 if (!pskb_may_pull(skb, sizeof(*ph)))
185 goto out;
186
187 ph = (struct ip_beet_phdr *)skb->data;
188
189 phlen = sizeof(*ph) + ph->padlen;
190 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
191 if (optlen < 0 || optlen & 3 || optlen > 250)
192 goto out;
193
194 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
195
196 if (!pskb_may_pull(skb, phlen))
197 goto out;
198 __skb_pull(skb, phlen);
199 }
200
201 skb_push(skb, sizeof(*iph));
202 skb_reset_network_header(skb);
203 skb_mac_header_rebuild(skb);
204
205 xfrm4_beet_make_header(skb);
206
207 iph = ip_hdr(skb);
208
209 iph->ihl += optlen / 4;
210 iph->tot_len = htons(skb->len);
211 iph->daddr = x->sel.daddr.a4;
212 iph->saddr = x->sel.saddr.a4;
213 iph->check = 0;
214 iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
215 err = 0;
216 out:
217 return err;
218 }
219
ipip_ecn_decapsulate(struct sk_buff * skb)220 static void ipip_ecn_decapsulate(struct sk_buff *skb)
221 {
222 struct iphdr *inner_iph = ipip_hdr(skb);
223
224 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
225 IP_ECN_set_ce(inner_iph);
226 }
227
xfrm4_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)228 static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
229 {
230 int err = -EINVAL;
231
232 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
233 goto out;
234
235 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
236 goto out;
237
238 err = skb_unclone(skb, GFP_ATOMIC);
239 if (err)
240 goto out;
241
242 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
243 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
244 if (!(x->props.flags & XFRM_STATE_NOECN))
245 ipip_ecn_decapsulate(skb);
246
247 skb_reset_network_header(skb);
248 skb_mac_header_rebuild(skb);
249 if (skb->mac_len)
250 eth_hdr(skb)->h_proto = skb->protocol;
251
252 err = 0;
253
254 out:
255 return err;
256 }
257
ipip6_ecn_decapsulate(struct sk_buff * skb)258 static void ipip6_ecn_decapsulate(struct sk_buff *skb)
259 {
260 struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
261
262 if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
263 IP6_ECN_set_ce(skb, inner_iph);
264 }
265
xfrm6_remove_tunnel_encap(struct xfrm_state * x,struct sk_buff * skb)266 static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
267 {
268 int err = -EINVAL;
269
270 if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
271 goto out;
272 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
273 goto out;
274
275 err = skb_unclone(skb, GFP_ATOMIC);
276 if (err)
277 goto out;
278
279 if (x->props.flags & XFRM_STATE_DECAP_DSCP)
280 ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
281 if (!(x->props.flags & XFRM_STATE_NOECN))
282 ipip6_ecn_decapsulate(skb);
283
284 skb_reset_network_header(skb);
285 skb_mac_header_rebuild(skb);
286 if (skb->mac_len)
287 eth_hdr(skb)->h_proto = skb->protocol;
288
289 err = 0;
290
291 out:
292 return err;
293 }
294
xfrm6_remove_beet_encap(struct xfrm_state * x,struct sk_buff * skb)295 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
296 {
297 struct ipv6hdr *ip6h;
298 int size = sizeof(struct ipv6hdr);
299 int err;
300
301 err = skb_cow_head(skb, size + skb->mac_len);
302 if (err)
303 goto out;
304
305 __skb_push(skb, size);
306 skb_reset_network_header(skb);
307 skb_mac_header_rebuild(skb);
308
309 xfrm6_beet_make_header(skb);
310
311 ip6h = ipv6_hdr(skb);
312 ip6h->payload_len = htons(skb->len - size);
313 ip6h->daddr = x->sel.daddr.in6;
314 ip6h->saddr = x->sel.saddr.in6;
315 err = 0;
316 out:
317 return err;
318 }
319
320 /* Remove encapsulation header.
321 *
322 * The IP header will be moved over the top of the encapsulation
323 * header.
324 *
325 * On entry, the transport header shall point to where the IP header
326 * should be and the network header shall be set to where the IP
327 * header currently is. skb->data shall point to the start of the
328 * payload.
329 */
330 static int
xfrm_inner_mode_encap_remove(struct xfrm_state * x,const struct xfrm_mode * inner_mode,struct sk_buff * skb)331 xfrm_inner_mode_encap_remove(struct xfrm_state *x,
332 const struct xfrm_mode *inner_mode,
333 struct sk_buff *skb)
334 {
335 switch (inner_mode->encap) {
336 case XFRM_MODE_BEET:
337 if (inner_mode->family == AF_INET)
338 return xfrm4_remove_beet_encap(x, skb);
339 if (inner_mode->family == AF_INET6)
340 return xfrm6_remove_beet_encap(x, skb);
341 break;
342 case XFRM_MODE_TUNNEL:
343 if (inner_mode->family == AF_INET)
344 return xfrm4_remove_tunnel_encap(x, skb);
345 if (inner_mode->family == AF_INET6)
346 return xfrm6_remove_tunnel_encap(x, skb);
347 break;
348 }
349
350 WARN_ON_ONCE(1);
351 return -EOPNOTSUPP;
352 }
353
xfrm_prepare_input(struct xfrm_state * x,struct sk_buff * skb)354 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
355 {
356 const struct xfrm_mode *inner_mode = &x->inner_mode;
357
358 switch (x->outer_mode.family) {
359 case AF_INET:
360 xfrm4_extract_header(skb);
361 break;
362 case AF_INET6:
363 xfrm6_extract_header(skb);
364 break;
365 default:
366 WARN_ON_ONCE(1);
367 return -EAFNOSUPPORT;
368 }
369
370 if (x->sel.family == AF_UNSPEC) {
371 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
372 if (!inner_mode)
373 return -EAFNOSUPPORT;
374 }
375
376 switch (inner_mode->family) {
377 case AF_INET:
378 skb->protocol = htons(ETH_P_IP);
379 break;
380 case AF_INET6:
381 skb->protocol = htons(ETH_P_IPV6);
382 break;
383 default:
384 WARN_ON_ONCE(1);
385 break;
386 }
387
388 return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
389 }
390
391 /* Remove encapsulation header.
392 *
393 * The IP header will be moved over the top of the encapsulation header.
394 *
395 * On entry, skb_transport_header() shall point to where the IP header
396 * should be and skb_network_header() shall be set to where the IP header
397 * currently is. skb->data shall point to the start of the payload.
398 */
xfrm4_transport_input(struct xfrm_state * x,struct sk_buff * skb)399 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
400 {
401 int ihl = skb->data - skb_transport_header(skb);
402
403 if (skb->transport_header != skb->network_header) {
404 memmove(skb_transport_header(skb),
405 skb_network_header(skb), ihl);
406 skb->network_header = skb->transport_header;
407 }
408 ip_hdr(skb)->tot_len = htons(skb->len + ihl);
409 skb_reset_transport_header(skb);
410 return 0;
411 }
412
xfrm6_transport_input(struct xfrm_state * x,struct sk_buff * skb)413 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
414 {
415 #if IS_ENABLED(CONFIG_IPV6)
416 int ihl = skb->data - skb_transport_header(skb);
417
418 if (skb->transport_header != skb->network_header) {
419 memmove(skb_transport_header(skb),
420 skb_network_header(skb), ihl);
421 skb->network_header = skb->transport_header;
422 }
423 ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
424 sizeof(struct ipv6hdr));
425 skb_reset_transport_header(skb);
426 return 0;
427 #else
428 WARN_ON_ONCE(1);
429 return -EAFNOSUPPORT;
430 #endif
431 }
432
xfrm_inner_mode_input(struct xfrm_state * x,const struct xfrm_mode * inner_mode,struct sk_buff * skb)433 static int xfrm_inner_mode_input(struct xfrm_state *x,
434 const struct xfrm_mode *inner_mode,
435 struct sk_buff *skb)
436 {
437 switch (inner_mode->encap) {
438 case XFRM_MODE_BEET:
439 case XFRM_MODE_TUNNEL:
440 return xfrm_prepare_input(x, skb);
441 case XFRM_MODE_TRANSPORT:
442 if (inner_mode->family == AF_INET)
443 return xfrm4_transport_input(x, skb);
444 if (inner_mode->family == AF_INET6)
445 return xfrm6_transport_input(x, skb);
446 break;
447 case XFRM_MODE_ROUTEOPTIMIZATION:
448 WARN_ON_ONCE(1);
449 break;
450 default:
451 WARN_ON_ONCE(1);
452 break;
453 }
454
455 return -EOPNOTSUPP;
456 }
457
xfrm_input(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)458 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
459 {
460 const struct xfrm_state_afinfo *afinfo;
461 struct net *net = dev_net(skb->dev);
462 const struct xfrm_mode *inner_mode;
463 int err;
464 __be32 seq;
465 __be32 seq_hi;
466 struct xfrm_state *x = NULL;
467 xfrm_address_t *daddr;
468 u32 mark = skb->mark;
469 unsigned int family = AF_UNSPEC;
470 int decaps = 0;
471 int async = 0;
472 bool xfrm_gro = false;
473 bool crypto_done = false;
474 struct xfrm_offload *xo = xfrm_offload(skb);
475 struct sec_path *sp;
476
477 if (encap_type < 0) {
478 x = xfrm_input_state(skb);
479
480 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
481 if (x->km.state == XFRM_STATE_ACQ)
482 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
483 else
484 XFRM_INC_STATS(net,
485 LINUX_MIB_XFRMINSTATEINVALID);
486
487 if (encap_type == -1)
488 dev_put(skb->dev);
489 goto drop;
490 }
491
492 family = x->outer_mode.family;
493
494 /* An encap_type of -1 indicates async resumption. */
495 if (encap_type == -1) {
496 async = 1;
497 seq = XFRM_SKB_CB(skb)->seq.input.low;
498 goto resume;
499 }
500
501 /* encap_type < -1 indicates a GRO call. */
502 encap_type = 0;
503 seq = XFRM_SPI_SKB_CB(skb)->seq;
504
505 if (xo && (xo->flags & CRYPTO_DONE)) {
506 crypto_done = true;
507 family = XFRM_SPI_SKB_CB(skb)->family;
508
509 if (!(xo->status & CRYPTO_SUCCESS)) {
510 if (xo->status &
511 (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
512 CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
513 CRYPTO_TUNNEL_AH_AUTH_FAILED |
514 CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
515
516 xfrm_audit_state_icvfail(x, skb,
517 x->type->proto);
518 x->stats.integrity_failed++;
519 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
520 goto drop;
521 }
522
523 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
524 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
525 goto drop;
526 }
527
528 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
529 goto drop;
530 }
531
532 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
533 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
534 goto drop;
535 }
536 }
537
538 goto lock;
539 }
540
541 family = XFRM_SPI_SKB_CB(skb)->family;
542
543 /* if tunnel is present override skb->mark value with tunnel i_key */
544 switch (family) {
545 case AF_INET:
546 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
547 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
548 break;
549 case AF_INET6:
550 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
551 mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
552 break;
553 }
554
555 sp = secpath_set(skb);
556 if (!sp) {
557 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
558 goto drop;
559 }
560
561 seq = 0;
562 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
563 secpath_reset(skb);
564 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
565 goto drop;
566 }
567
568 daddr = (xfrm_address_t *)(skb_network_header(skb) +
569 XFRM_SPI_SKB_CB(skb)->daddroff);
570 do {
571 sp = skb_sec_path(skb);
572
573 if (sp->len == XFRM_MAX_DEPTH) {
574 secpath_reset(skb);
575 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
576 goto drop;
577 }
578
579 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
580 if (x == NULL) {
581 secpath_reset(skb);
582 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
583 xfrm_audit_state_notfound(skb, family, spi, seq);
584 goto drop;
585 }
586
587 skb->mark = xfrm_smark_get(skb->mark, x);
588
589 sp->xvec[sp->len++] = x;
590
591 skb_dst_force(skb);
592 if (!skb_dst(skb)) {
593 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
594 goto drop;
595 }
596
597 lock:
598 spin_lock(&x->lock);
599
600 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
601 if (x->km.state == XFRM_STATE_ACQ)
602 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
603 else
604 XFRM_INC_STATS(net,
605 LINUX_MIB_XFRMINSTATEINVALID);
606 goto drop_unlock;
607 }
608
609 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
610 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
611 goto drop_unlock;
612 }
613
614 if (x->repl->check(x, skb, seq)) {
615 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
616 goto drop_unlock;
617 }
618
619 if (xfrm_state_check_expire(x)) {
620 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
621 goto drop_unlock;
622 }
623
624 spin_unlock(&x->lock);
625
626 if (xfrm_tunnel_check(skb, x, family)) {
627 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
628 goto drop;
629 }
630
631 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
632
633 XFRM_SKB_CB(skb)->seq.input.low = seq;
634 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
635
636 dev_hold(skb->dev);
637
638 if (crypto_done)
639 nexthdr = x->type_offload->input_tail(x, skb);
640 else
641 nexthdr = x->type->input(x, skb);
642
643 if (nexthdr == -EINPROGRESS)
644 return 0;
645 resume:
646 dev_put(skb->dev);
647
648 spin_lock(&x->lock);
649 if (nexthdr < 0) {
650 if (nexthdr == -EBADMSG) {
651 xfrm_audit_state_icvfail(x, skb,
652 x->type->proto);
653 x->stats.integrity_failed++;
654 }
655 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
656 goto drop_unlock;
657 }
658
659 /* only the first xfrm gets the encap type */
660 encap_type = 0;
661
662 if (x->repl->recheck(x, skb, seq)) {
663 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
664 goto drop_unlock;
665 }
666
667 x->repl->advance(x, seq);
668
669 x->curlft.bytes += skb->len;
670 x->curlft.packets++;
671
672 spin_unlock(&x->lock);
673
674 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
675
676 inner_mode = &x->inner_mode;
677
678 if (x->sel.family == AF_UNSPEC) {
679 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
680 if (inner_mode == NULL) {
681 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
682 goto drop;
683 }
684 }
685
686 if (xfrm_inner_mode_input(x, inner_mode, skb)) {
687 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
688 goto drop;
689 }
690
691 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
692 decaps = 1;
693 break;
694 }
695
696 /*
697 * We need the inner address. However, we only get here for
698 * transport mode so the outer address is identical.
699 */
700 daddr = &x->id.daddr;
701 family = x->outer_mode.family;
702
703 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
704 if (err < 0) {
705 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
706 goto drop;
707 }
708 crypto_done = false;
709 } while (!err);
710
711 err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
712 if (err)
713 goto drop;
714
715 nf_reset_ct(skb);
716
717 if (decaps) {
718 sp = skb_sec_path(skb);
719 if (sp)
720 sp->olen = 0;
721 skb_dst_drop(skb);
722 gro_cells_receive(&gro_cells, skb);
723 return 0;
724 } else {
725 xo = xfrm_offload(skb);
726 if (xo)
727 xfrm_gro = xo->flags & XFRM_GRO;
728
729 err = -EAFNOSUPPORT;
730 rcu_read_lock();
731 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
732 if (likely(afinfo))
733 err = afinfo->transport_finish(skb, xfrm_gro || async);
734 rcu_read_unlock();
735 if (xfrm_gro) {
736 sp = skb_sec_path(skb);
737 if (sp)
738 sp->olen = 0;
739 skb_dst_drop(skb);
740 gro_cells_receive(&gro_cells, skb);
741 return err;
742 }
743
744 return err;
745 }
746
747 drop_unlock:
748 spin_unlock(&x->lock);
749 drop:
750 xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
751 kfree_skb(skb);
752 return 0;
753 }
754 EXPORT_SYMBOL(xfrm_input);
755
xfrm_input_resume(struct sk_buff * skb,int nexthdr)756 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
757 {
758 return xfrm_input(skb, nexthdr, 0, -1);
759 }
760 EXPORT_SYMBOL(xfrm_input_resume);
761
xfrm_trans_reinject(unsigned long data)762 static void xfrm_trans_reinject(unsigned long data)
763 {
764 struct xfrm_trans_tasklet *trans = (void *)data;
765 struct sk_buff_head queue;
766 struct sk_buff *skb;
767
768 __skb_queue_head_init(&queue);
769 skb_queue_splice_init(&trans->queue, &queue);
770
771 while ((skb = __skb_dequeue(&queue)))
772 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
773 NULL, skb);
774 }
775
xfrm_trans_queue_net(struct net * net,struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))776 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
777 int (*finish)(struct net *, struct sock *,
778 struct sk_buff *))
779 {
780 struct xfrm_trans_tasklet *trans;
781
782 trans = this_cpu_ptr(&xfrm_trans_tasklet);
783
784 if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog))
785 return -ENOBUFS;
786
787 BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
788
789 XFRM_TRANS_SKB_CB(skb)->finish = finish;
790 XFRM_TRANS_SKB_CB(skb)->net = net;
791 __skb_queue_tail(&trans->queue, skb);
792 tasklet_schedule(&trans->tasklet);
793 return 0;
794 }
795 EXPORT_SYMBOL(xfrm_trans_queue_net);
796
xfrm_trans_queue(struct sk_buff * skb,int (* finish)(struct net *,struct sock *,struct sk_buff *))797 int xfrm_trans_queue(struct sk_buff *skb,
798 int (*finish)(struct net *, struct sock *,
799 struct sk_buff *))
800 {
801 return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
802 }
803 EXPORT_SYMBOL(xfrm_trans_queue);
804
xfrm_input_init(void)805 void __init xfrm_input_init(void)
806 {
807 int err;
808 int i;
809
810 init_dummy_netdev(&xfrm_napi_dev);
811 err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
812 if (err)
813 gro_cells.cells = NULL;
814
815 for_each_possible_cpu(i) {
816 struct xfrm_trans_tasklet *trans;
817
818 trans = &per_cpu(xfrm_trans_tasklet, i);
819 __skb_queue_head_init(&trans->queue);
820 tasklet_init(&trans->tasklet, xfrm_trans_reinject,
821 (unsigned long)trans);
822 }
823 }
824