Merge tag 'linux-watchdog-6.3-rc1' of git://www.linux-watchdog.org/linux-watchdog
[platform/kernel/linux-starfive.git] / net / xfrm / xfrm_input.c
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
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
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
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
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
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
135         return sp;
136 }
137 EXPORT_SYMBOL(secpath_set);
138
139 /* Fetch spi and seq from ipsec header */
140
141 int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
142 {
143         int offset, offset_seq;
144         int hlen;
145
146         switch (nexthdr) {
147         case IPPROTO_AH:
148                 hlen = sizeof(struct ip_auth_hdr);
149                 offset = offsetof(struct ip_auth_hdr, spi);
150                 offset_seq = offsetof(struct ip_auth_hdr, seq_no);
151                 break;
152         case IPPROTO_ESP:
153                 hlen = sizeof(struct ip_esp_hdr);
154                 offset = offsetof(struct ip_esp_hdr, spi);
155                 offset_seq = offsetof(struct ip_esp_hdr, seq_no);
156                 break;
157         case IPPROTO_COMP:
158                 if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
159                         return -EINVAL;
160                 *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
161                 *seq = 0;
162                 return 0;
163         default:
164                 return 1;
165         }
166
167         if (!pskb_may_pull(skb, hlen))
168                 return -EINVAL;
169
170         *spi = *(__be32 *)(skb_transport_header(skb) + offset);
171         *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
172         return 0;
173 }
174 EXPORT_SYMBOL(xfrm_parse_spi);
175
176 static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
177 {
178         struct iphdr *iph;
179         int optlen = 0;
180         int err = -EINVAL;
181
182         if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
183                 struct ip_beet_phdr *ph;
184                 int phlen;
185
186                 if (!pskb_may_pull(skb, sizeof(*ph)))
187                         goto out;
188
189                 ph = (struct ip_beet_phdr *)skb->data;
190
191                 phlen = sizeof(*ph) + ph->padlen;
192                 optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
193                 if (optlen < 0 || optlen & 3 || optlen > 250)
194                         goto out;
195
196                 XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
197
198                 if (!pskb_may_pull(skb, phlen))
199                         goto out;
200                 __skb_pull(skb, phlen);
201         }
202
203         skb_push(skb, sizeof(*iph));
204         skb_reset_network_header(skb);
205         skb_mac_header_rebuild(skb);
206
207         xfrm4_beet_make_header(skb);
208
209         iph = ip_hdr(skb);
210
211         iph->ihl += optlen / 4;
212         iph->tot_len = htons(skb->len);
213         iph->daddr = x->sel.daddr.a4;
214         iph->saddr = x->sel.saddr.a4;
215         iph->check = 0;
216         iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
217         err = 0;
218 out:
219         return err;
220 }
221
222 static void ipip_ecn_decapsulate(struct sk_buff *skb)
223 {
224         struct iphdr *inner_iph = ipip_hdr(skb);
225
226         if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
227                 IP_ECN_set_ce(inner_iph);
228 }
229
230 static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
231 {
232         int err = -EINVAL;
233
234         if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
235                 goto out;
236
237         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
238                 goto out;
239
240         err = skb_unclone(skb, GFP_ATOMIC);
241         if (err)
242                 goto out;
243
244         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
245                 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
246         if (!(x->props.flags & XFRM_STATE_NOECN))
247                 ipip_ecn_decapsulate(skb);
248
249         skb_reset_network_header(skb);
250         skb_mac_header_rebuild(skb);
251         if (skb->mac_len)
252                 eth_hdr(skb)->h_proto = skb->protocol;
253
254         err = 0;
255
256 out:
257         return err;
258 }
259
260 static void ipip6_ecn_decapsulate(struct sk_buff *skb)
261 {
262         struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
263
264         if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
265                 IP6_ECN_set_ce(skb, inner_iph);
266 }
267
268 static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
269 {
270         int err = -EINVAL;
271
272         if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
273                 goto out;
274         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
275                 goto out;
276
277         err = skb_unclone(skb, GFP_ATOMIC);
278         if (err)
279                 goto out;
280
281         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
282                 ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
283         if (!(x->props.flags & XFRM_STATE_NOECN))
284                 ipip6_ecn_decapsulate(skb);
285
286         skb_reset_network_header(skb);
287         skb_mac_header_rebuild(skb);
288         if (skb->mac_len)
289                 eth_hdr(skb)->h_proto = skb->protocol;
290
291         err = 0;
292
293 out:
294         return err;
295 }
296
297 static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
298 {
299         struct ipv6hdr *ip6h;
300         int size = sizeof(struct ipv6hdr);
301         int err;
302
303         err = skb_cow_head(skb, size + skb->mac_len);
304         if (err)
305                 goto out;
306
307         __skb_push(skb, size);
308         skb_reset_network_header(skb);
309         skb_mac_header_rebuild(skb);
310
311         xfrm6_beet_make_header(skb);
312
313         ip6h = ipv6_hdr(skb);
314         ip6h->payload_len = htons(skb->len - size);
315         ip6h->daddr = x->sel.daddr.in6;
316         ip6h->saddr = x->sel.saddr.in6;
317         err = 0;
318 out:
319         return err;
320 }
321
322 /* Remove encapsulation header.
323  *
324  * The IP header will be moved over the top of the encapsulation
325  * header.
326  *
327  * On entry, the transport header shall point to where the IP header
328  * should be and the network header shall be set to where the IP
329  * header currently is.  skb->data shall point to the start of the
330  * payload.
331  */
332 static int
333 xfrm_inner_mode_encap_remove(struct xfrm_state *x,
334                              const struct xfrm_mode *inner_mode,
335                              struct sk_buff *skb)
336 {
337         switch (inner_mode->encap) {
338         case XFRM_MODE_BEET:
339                 if (inner_mode->family == AF_INET)
340                         return xfrm4_remove_beet_encap(x, skb);
341                 if (inner_mode->family == AF_INET6)
342                         return xfrm6_remove_beet_encap(x, skb);
343                 break;
344         case XFRM_MODE_TUNNEL:
345                 if (inner_mode->family == AF_INET)
346                         return xfrm4_remove_tunnel_encap(x, skb);
347                 if (inner_mode->family == AF_INET6)
348                         return xfrm6_remove_tunnel_encap(x, skb);
349                 break;
350         }
351
352         WARN_ON_ONCE(1);
353         return -EOPNOTSUPP;
354 }
355
356 static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
357 {
358         const struct xfrm_mode *inner_mode = &x->inner_mode;
359
360         switch (x->outer_mode.family) {
361         case AF_INET:
362                 xfrm4_extract_header(skb);
363                 break;
364         case AF_INET6:
365                 xfrm6_extract_header(skb);
366                 break;
367         default:
368                 WARN_ON_ONCE(1);
369                 return -EAFNOSUPPORT;
370         }
371
372         if (x->sel.family == AF_UNSPEC) {
373                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
374                 if (!inner_mode)
375                         return -EAFNOSUPPORT;
376         }
377
378         switch (inner_mode->family) {
379         case AF_INET:
380                 skb->protocol = htons(ETH_P_IP);
381                 break;
382         case AF_INET6:
383                 skb->protocol = htons(ETH_P_IPV6);
384                 break;
385         default:
386                 WARN_ON_ONCE(1);
387                 break;
388         }
389
390         return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
391 }
392
393 /* Remove encapsulation header.
394  *
395  * The IP header will be moved over the top of the encapsulation header.
396  *
397  * On entry, skb_transport_header() shall point to where the IP header
398  * should be and skb_network_header() shall be set to where the IP header
399  * currently is.  skb->data shall point to the start of the payload.
400  */
401 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
402 {
403         int ihl = skb->data - skb_transport_header(skb);
404
405         if (skb->transport_header != skb->network_header) {
406                 memmove(skb_transport_header(skb),
407                         skb_network_header(skb), ihl);
408                 skb->network_header = skb->transport_header;
409         }
410         ip_hdr(skb)->tot_len = htons(skb->len + ihl);
411         skb_reset_transport_header(skb);
412         return 0;
413 }
414
415 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
416 {
417 #if IS_ENABLED(CONFIG_IPV6)
418         int ihl = skb->data - skb_transport_header(skb);
419
420         if (skb->transport_header != skb->network_header) {
421                 memmove(skb_transport_header(skb),
422                         skb_network_header(skb), ihl);
423                 skb->network_header = skb->transport_header;
424         }
425         ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
426                                            sizeof(struct ipv6hdr));
427         skb_reset_transport_header(skb);
428         return 0;
429 #else
430         WARN_ON_ONCE(1);
431         return -EAFNOSUPPORT;
432 #endif
433 }
434
435 static int xfrm_inner_mode_input(struct xfrm_state *x,
436                                  const struct xfrm_mode *inner_mode,
437                                  struct sk_buff *skb)
438 {
439         switch (inner_mode->encap) {
440         case XFRM_MODE_BEET:
441         case XFRM_MODE_TUNNEL:
442                 return xfrm_prepare_input(x, skb);
443         case XFRM_MODE_TRANSPORT:
444                 if (inner_mode->family == AF_INET)
445                         return xfrm4_transport_input(x, skb);
446                 if (inner_mode->family == AF_INET6)
447                         return xfrm6_transport_input(x, skb);
448                 break;
449         case XFRM_MODE_ROUTEOPTIMIZATION:
450                 WARN_ON_ONCE(1);
451                 break;
452         default:
453                 WARN_ON_ONCE(1);
454                 break;
455         }
456
457         return -EOPNOTSUPP;
458 }
459
460 int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
461 {
462         const struct xfrm_state_afinfo *afinfo;
463         struct net *net = dev_net(skb->dev);
464         const struct xfrm_mode *inner_mode;
465         int err;
466         __be32 seq;
467         __be32 seq_hi;
468         struct xfrm_state *x = NULL;
469         xfrm_address_t *daddr;
470         u32 mark = skb->mark;
471         unsigned int family = AF_UNSPEC;
472         int decaps = 0;
473         int async = 0;
474         bool xfrm_gro = false;
475         bool crypto_done = false;
476         struct xfrm_offload *xo = xfrm_offload(skb);
477         struct sec_path *sp;
478
479         if (encap_type < 0) {
480                 x = xfrm_input_state(skb);
481
482                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
483                         if (x->km.state == XFRM_STATE_ACQ)
484                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
485                         else
486                                 XFRM_INC_STATS(net,
487                                                LINUX_MIB_XFRMINSTATEINVALID);
488
489                         if (encap_type == -1)
490                                 dev_put(skb->dev);
491                         goto drop;
492                 }
493
494                 family = x->outer_mode.family;
495
496                 /* An encap_type of -1 indicates async resumption. */
497                 if (encap_type == -1) {
498                         async = 1;
499                         seq = XFRM_SKB_CB(skb)->seq.input.low;
500                         goto resume;
501                 }
502
503                 /* encap_type < -1 indicates a GRO call. */
504                 encap_type = 0;
505                 seq = XFRM_SPI_SKB_CB(skb)->seq;
506
507                 if (xo && (xo->flags & CRYPTO_DONE)) {
508                         crypto_done = true;
509                         family = XFRM_SPI_SKB_CB(skb)->family;
510
511                         if (!(xo->status & CRYPTO_SUCCESS)) {
512                                 if (xo->status &
513                                     (CRYPTO_TRANSPORT_AH_AUTH_FAILED |
514                                      CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
515                                      CRYPTO_TUNNEL_AH_AUTH_FAILED |
516                                      CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
517
518                                         xfrm_audit_state_icvfail(x, skb,
519                                                                  x->type->proto);
520                                         x->stats.integrity_failed++;
521                                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
522                                         goto drop;
523                                 }
524
525                                 if (xo->status & CRYPTO_INVALID_PROTOCOL) {
526                                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
527                                         goto drop;
528                                 }
529
530                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
531                                 goto drop;
532                         }
533
534                         if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
535                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
536                                 goto drop;
537                         }
538                 }
539
540                 goto lock;
541         }
542
543         family = XFRM_SPI_SKB_CB(skb)->family;
544
545         /* if tunnel is present override skb->mark value with tunnel i_key */
546         switch (family) {
547         case AF_INET:
548                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
549                         mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
550                 break;
551         case AF_INET6:
552                 if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
553                         mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
554                 break;
555         }
556
557         sp = secpath_set(skb);
558         if (!sp) {
559                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
560                 goto drop;
561         }
562
563         seq = 0;
564         if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
565                 secpath_reset(skb);
566                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
567                 goto drop;
568         }
569
570         daddr = (xfrm_address_t *)(skb_network_header(skb) +
571                                    XFRM_SPI_SKB_CB(skb)->daddroff);
572         do {
573                 sp = skb_sec_path(skb);
574
575                 if (sp->len == XFRM_MAX_DEPTH) {
576                         secpath_reset(skb);
577                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
578                         goto drop;
579                 }
580
581                 x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
582                 if (x == NULL) {
583                         secpath_reset(skb);
584                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
585                         xfrm_audit_state_notfound(skb, family, spi, seq);
586                         goto drop;
587                 }
588
589                 skb->mark = xfrm_smark_get(skb->mark, x);
590
591                 sp->xvec[sp->len++] = x;
592
593                 skb_dst_force(skb);
594                 if (!skb_dst(skb)) {
595                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
596                         goto drop;
597                 }
598
599 lock:
600                 spin_lock(&x->lock);
601
602                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
603                         if (x->km.state == XFRM_STATE_ACQ)
604                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
605                         else
606                                 XFRM_INC_STATS(net,
607                                                LINUX_MIB_XFRMINSTATEINVALID);
608                         goto drop_unlock;
609                 }
610
611                 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
612                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
613                         goto drop_unlock;
614                 }
615
616                 if (xfrm_replay_check(x, skb, seq)) {
617                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
618                         goto drop_unlock;
619                 }
620
621                 if (xfrm_state_check_expire(x)) {
622                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
623                         goto drop_unlock;
624                 }
625
626                 spin_unlock(&x->lock);
627
628                 if (xfrm_tunnel_check(skb, x, family)) {
629                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
630                         goto drop;
631                 }
632
633                 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
634
635                 XFRM_SKB_CB(skb)->seq.input.low = seq;
636                 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
637
638                 dev_hold(skb->dev);
639
640                 if (crypto_done)
641                         nexthdr = x->type_offload->input_tail(x, skb);
642                 else
643                         nexthdr = x->type->input(x, skb);
644
645                 if (nexthdr == -EINPROGRESS)
646                         return 0;
647 resume:
648                 dev_put(skb->dev);
649
650                 spin_lock(&x->lock);
651                 if (nexthdr < 0) {
652                         if (nexthdr == -EBADMSG) {
653                                 xfrm_audit_state_icvfail(x, skb,
654                                                          x->type->proto);
655                                 x->stats.integrity_failed++;
656                         }
657                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
658                         goto drop_unlock;
659                 }
660
661                 /* only the first xfrm gets the encap type */
662                 encap_type = 0;
663
664                 if (xfrm_replay_recheck(x, skb, seq)) {
665                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
666                         goto drop_unlock;
667                 }
668
669                 xfrm_replay_advance(x, seq);
670
671                 x->curlft.bytes += skb->len;
672                 x->curlft.packets++;
673                 x->lastused = ktime_get_real_seconds();
674
675                 spin_unlock(&x->lock);
676
677                 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
678
679                 inner_mode = &x->inner_mode;
680
681                 if (x->sel.family == AF_UNSPEC) {
682                         inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
683                         if (inner_mode == NULL) {
684                                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
685                                 goto drop;
686                         }
687                 }
688
689                 if (xfrm_inner_mode_input(x, inner_mode, skb)) {
690                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
691                         goto drop;
692                 }
693
694                 if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
695                         decaps = 1;
696                         break;
697                 }
698
699                 /*
700                  * We need the inner address.  However, we only get here for
701                  * transport mode so the outer address is identical.
702                  */
703                 daddr = &x->id.daddr;
704                 family = x->outer_mode.family;
705
706                 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
707                 if (err < 0) {
708                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
709                         goto drop;
710                 }
711                 crypto_done = false;
712         } while (!err);
713
714         err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
715         if (err)
716                 goto drop;
717
718         nf_reset_ct(skb);
719
720         if (decaps) {
721                 sp = skb_sec_path(skb);
722                 if (sp)
723                         sp->olen = 0;
724                 if (skb_valid_dst(skb))
725                         skb_dst_drop(skb);
726                 gro_cells_receive(&gro_cells, skb);
727                 return 0;
728         } else {
729                 xo = xfrm_offload(skb);
730                 if (xo)
731                         xfrm_gro = xo->flags & XFRM_GRO;
732
733                 err = -EAFNOSUPPORT;
734                 rcu_read_lock();
735                 afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
736                 if (likely(afinfo))
737                         err = afinfo->transport_finish(skb, xfrm_gro || async);
738                 rcu_read_unlock();
739                 if (xfrm_gro) {
740                         sp = skb_sec_path(skb);
741                         if (sp)
742                                 sp->olen = 0;
743                         if (skb_valid_dst(skb))
744                                 skb_dst_drop(skb);
745                         gro_cells_receive(&gro_cells, skb);
746                         return err;
747                 }
748
749                 return err;
750         }
751
752 drop_unlock:
753         spin_unlock(&x->lock);
754 drop:
755         xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
756         kfree_skb(skb);
757         return 0;
758 }
759 EXPORT_SYMBOL(xfrm_input);
760
761 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
762 {
763         return xfrm_input(skb, nexthdr, 0, -1);
764 }
765 EXPORT_SYMBOL(xfrm_input_resume);
766
767 static void xfrm_trans_reinject(struct work_struct *work)
768 {
769         struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work);
770         struct sk_buff_head queue;
771         struct sk_buff *skb;
772
773         __skb_queue_head_init(&queue);
774         spin_lock_bh(&trans->queue_lock);
775         skb_queue_splice_init(&trans->queue, &queue);
776         spin_unlock_bh(&trans->queue_lock);
777
778         local_bh_disable();
779         while ((skb = __skb_dequeue(&queue)))
780                 XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net,
781                                                NULL, skb);
782         local_bh_enable();
783 }
784
785 int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb,
786                          int (*finish)(struct net *, struct sock *,
787                                        struct sk_buff *))
788 {
789         struct xfrm_trans_tasklet *trans;
790
791         trans = this_cpu_ptr(&xfrm_trans_tasklet);
792
793         if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog))
794                 return -ENOBUFS;
795
796         BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
797
798         XFRM_TRANS_SKB_CB(skb)->finish = finish;
799         XFRM_TRANS_SKB_CB(skb)->net = net;
800         spin_lock_bh(&trans->queue_lock);
801         __skb_queue_tail(&trans->queue, skb);
802         spin_unlock_bh(&trans->queue_lock);
803         schedule_work(&trans->work);
804         return 0;
805 }
806 EXPORT_SYMBOL(xfrm_trans_queue_net);
807
808 int xfrm_trans_queue(struct sk_buff *skb,
809                      int (*finish)(struct net *, struct sock *,
810                                    struct sk_buff *))
811 {
812         return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
813 }
814 EXPORT_SYMBOL(xfrm_trans_queue);
815
816 void __init xfrm_input_init(void)
817 {
818         int err;
819         int i;
820
821         init_dummy_netdev(&xfrm_napi_dev);
822         err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
823         if (err)
824                 gro_cells.cells = NULL;
825
826         for_each_possible_cpu(i) {
827                 struct xfrm_trans_tasklet *trans;
828
829                 trans = &per_cpu(xfrm_trans_tasklet, i);
830                 spin_lock_init(&trans->queue_lock);
831                 __skb_queue_head_init(&trans->queue);
832                 INIT_WORK(&trans->work, xfrm_trans_reinject);
833         }
834 }