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Merge tag 'pci-v5.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[linux-block.git] / net / ipv6 / esp6.c
CommitLineData
1ccea77e 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Copyright (C)2002 USAGI/WIDE Project
1ab1457c 4 *
1da177e4
LT		 5 * Authors
6 *
1ab1457c 7 * Mitsuru KANDA @USAGI : IPv6 Support
67ba4152
IM		 8 * Kazunori MIYAZAWA @USAGI :
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
1ab1457c 10 *
67ba4152 11 * This file is derived from net/ipv4/esp.c
1da177e4
LT		 12 */
13
f3213831
JP		 14#define pr_fmt(fmt) "IPv6: " fmt
15
38320c70
HX		 16#include <crypto/aead.h>
17#include <crypto/authenc.h>
6b7326c8 18#include <linux/err.h>
1da177e4
LT		 19#include <linux/module.h>
20#include <net/ip.h>
21#include <net/xfrm.h>
22#include <net/esp.h>
72998d8c 23#include <linux/scatterlist.h>
a02a6422 24#include <linux/kernel.h>
1da177e4
LT		 25#include <linux/pfkeyv2.h>
26#include <linux/random.h>
38320c70 27#include <linux/slab.h>
b7c6538c 28#include <linux/spinlock.h>
0146dca7 29#include <net/ip6_checksum.h>
81aded24 30#include <net/ip6_route.h>
1da177e4
LT		 31#include <net/icmp.h>
32#include <net/ipv6.h>
14c85021 33#include <net/protocol.h>
0146dca7 34#include <net/udp.h>
1da177e4 35#include <linux/icmpv6.h>
26333c37
SD		 36#include <net/tcp.h>
37#include <net/espintcp.h>
38#include <net/inet6_hashtables.h>
1da177e4 39
03e2a30f
SK		 40#include <linux/highmem.h>
41
38320c70
HX		 42struct esp_skb_cb {
43 struct xfrm_skb_cb xfrm;
44 void *tmp;
45};
46
0146dca7
SD		 47struct esp_output_extra {
48 __be32 seqhi;
49 u32 esphoff;
50};
51
38320c70
HX		 52#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
53
54/*
55 * Allocate an AEAD request structure with extra space for SG and IV.
56 *
d212a4c2
SK		 57 * For alignment considerations the upper 32 bits of the sequence number are
58 * placed at the front, if present. Followed by the IV, the request and finally
59 * the SG list.
38320c70
HX		 60 *
61 * TODO: Use spare space in skb for this where possible.
62 */
d212a4c2 63static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen)
38320c70
HX		 64{
65 unsigned int len;
66
d212a4c2
SK		 67 len = seqihlen;
68
69 len += crypto_aead_ivsize(aead);
70
38320c70
HX		 71 if (len) {
72 len += crypto_aead_alignmask(aead) &
73 ~(crypto_tfm_ctx_alignment() - 1);
74 len = ALIGN(len, crypto_tfm_ctx_alignment());
75 }
76
000ae7b2 77 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
38320c70
HX		 78 len = ALIGN(len, __alignof__(struct scatterlist));
79
80 len += sizeof(struct scatterlist) * nfrags;
81
82 return kmalloc(len, GFP_ATOMIC);
83}
84
0146dca7 85static inline void *esp_tmp_extra(void *tmp)
d212a4c2 86{
0146dca7 87 return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra));
d212a4c2
SK		 88}
89
90static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen)
38320c70
HX		 91{
92 return crypto_aead_ivsize(aead) ?
d212a4c2
SK		 93 PTR_ALIGN((u8 *)tmp + seqhilen,
94 crypto_aead_alignmask(aead) + 1) : tmp + seqhilen;
38320c70
HX		 95}
96
38320c70
HX		 97static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
98{
99 struct aead_request *req;
100
101 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
102 crypto_tfm_ctx_alignment());
103 aead_request_set_tfm(req, aead);
104 return req;
105}
106
107static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
108 struct aead_request *req)
109{
110 return (void *)ALIGN((unsigned long)(req + 1) +
111 crypto_aead_reqsize(aead),
112 __alignof__(struct scatterlist));
113}
114
03e2a30f
SK		 115static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
116{
0146dca7 117 struct esp_output_extra *extra = esp_tmp_extra(tmp);
03e2a30f 118 struct crypto_aead *aead = x->data;
0146dca7 119 int extralen = 0;
03e2a30f
SK		 120 u8 *iv;
121 struct aead_request *req;
122 struct scatterlist *sg;
123
124 if (x->props.flags & XFRM_STATE_ESN)
0146dca7 125 extralen += sizeof(*extra);
03e2a30f 126
0146dca7 127 iv = esp_tmp_iv(aead, tmp, extralen);
03e2a30f
SK		 128 req = esp_tmp_req(aead, iv);
129
130 /* Unref skb_frag_pages in the src scatterlist if necessary.
131 * Skip the first sg which comes from skb->data.
132 */
133 if (req->src != req->dst)
134 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
135 put_page(sg_page(sg));
136}
137
26333c37
SD		 138#ifdef CONFIG_INET6_ESPINTCP
139struct esp_tcp_sk {
140 struct sock *sk;
141 struct rcu_head rcu;
142};
143
144static void esp_free_tcp_sk(struct rcu_head *head)
145{
146 struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu);
147
148 sock_put(esk->sk);
149 kfree(esk);
150}
151
152static struct sock *esp6_find_tcp_sk(struct xfrm_state *x)
153{
154 struct xfrm_encap_tmpl *encap = x->encap;
155 struct esp_tcp_sk *esk;
156 __be16 sport, dport;
157 struct sock *nsk;
158 struct sock *sk;
159
160 sk = rcu_dereference(x->encap_sk);
161 if (sk && sk->sk_state == TCP_ESTABLISHED)
162 return sk;
163
164 spin_lock_bh(&x->lock);
165 sport = encap->encap_sport;
166 dport = encap->encap_dport;
167 nsk = rcu_dereference_protected(x->encap_sk,
168 lockdep_is_held(&x->lock));
169 if (sk && sk == nsk) {
170 esk = kmalloc(sizeof(*esk), GFP_ATOMIC);
171 if (!esk) {
172 spin_unlock_bh(&x->lock);
173 return ERR_PTR(-ENOMEM);
174 }
175 RCU_INIT_POINTER(x->encap_sk, NULL);
176 esk->sk = sk;
177 call_rcu(&esk->rcu, esp_free_tcp_sk);
178 }
179 spin_unlock_bh(&x->lock);
180
181 sk = __inet6_lookup_established(xs_net(x), &tcp_hashinfo, &x->id.daddr.in6,
182 dport, &x->props.saddr.in6, ntohs(sport), 0, 0);
183 if (!sk)
184 return ERR_PTR(-ENOENT);
185
186 if (!tcp_is_ulp_esp(sk)) {
187 sock_put(sk);
188 return ERR_PTR(-EINVAL);
189 }
190
191 spin_lock_bh(&x->lock);
192 nsk = rcu_dereference_protected(x->encap_sk,
193 lockdep_is_held(&x->lock));
194 if (encap->encap_sport != sport ||
195 encap->encap_dport != dport) {
196 sock_put(sk);
197 sk = nsk ?: ERR_PTR(-EREMCHG);
198 } else if (sk == nsk) {
199 sock_put(sk);
200 } else {
201 rcu_assign_pointer(x->encap_sk, sk);
202 }
203 spin_unlock_bh(&x->lock);
204
205 return sk;
206}
207
208static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb)
209{
210 struct sock *sk;
211 int err;
212
213 rcu_read_lock();
214
215 sk = esp6_find_tcp_sk(x);
216 err = PTR_ERR_OR_ZERO(sk);
217 if (err)
218 goto out;
219
220 bh_lock_sock(sk);
221 if (sock_owned_by_user(sk))
222 err = espintcp_queue_out(sk, skb);
223 else
224 err = espintcp_push_skb(sk, skb);
225 bh_unlock_sock(sk);
226
227out:
228 rcu_read_unlock();
229 return err;
230}
231
232static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk,
233 struct sk_buff *skb)
234{
235 struct dst_entry *dst = skb_dst(skb);
236 struct xfrm_state *x = dst->xfrm;
237
238 return esp_output_tcp_finish(x, skb);
239}
240
241static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
242{
243 int err;
244
245 local_bh_disable();
246 err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb);
247 local_bh_enable();
248
249 /* EINPROGRESS just happens to do the right thing. It
250 * actually means that the skb has been consumed and
251 * isn't coming back.
252 */
253 return err ?: -EINPROGRESS;
254}
255#else
256static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
257{
258 kfree_skb(skb);
259
260 return -EOPNOTSUPP;
261}
262#endif
263
0146dca7
SD		 264static void esp_output_encap_csum(struct sk_buff *skb)
265{
266 /* UDP encap with IPv6 requires a valid checksum */
267 if (*skb_mac_header(skb) == IPPROTO_UDP) {
268 struct udphdr *uh = udp_hdr(skb);
269 struct ipv6hdr *ip6h = ipv6_hdr(skb);
270 int len = ntohs(uh->len);
271 unsigned int offset = skb_transport_offset(skb);
272 __wsum csum = skb_checksum(skb, offset, skb->len - offset, 0);
273
274 uh->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
275 len, IPPROTO_UDP, csum);
276 if (uh->check == 0)
277 uh->check = CSUM_MANGLED_0;
278 }
279}
280
38320c70
HX		 281static void esp_output_done(struct crypto_async_request *base, int err)
282{
283 struct sk_buff *skb = base->data;
f53c7239 284 struct xfrm_offload *xo = xfrm_offload(skb);
03e2a30f 285 void *tmp;
f53c7239
SK		 286 struct xfrm_state *x;
287
2294be0f
FW		 288 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
289 struct sec_path *sp = skb_sec_path(skb);
290
291 x = sp->xvec[sp->len - 1];
292 } else {
f53c7239 293 x = skb_dst(skb)->xfrm;
2294be0f 294 }
38320c70 295
03e2a30f
SK		 296 tmp = ESP_SKB_CB(skb)->tmp;
297 esp_ssg_unref(x, tmp);
298 kfree(tmp);
f53c7239 299
0146dca7
SD		 300 esp_output_encap_csum(skb);
301
f53c7239
SK		 302 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
303 if (err) {
304 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
305 kfree_skb(skb);
306 return;
307 }
308
309 skb_push(skb, skb->data - skb_mac_header(skb));
310 secpath_reset(skb);
311 xfrm_dev_resume(skb);
312 } else {
26333c37
SD		 313 if (!err &&
314 x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
315 esp_output_tail_tcp(x, skb);
316 else
9ab1265d 317 xfrm_output_resume(skb->sk, skb, err);
f53c7239 318 }
38320c70
HX		 319}
320
000ae7b2
HX		 321/* Move ESP header back into place. */
322static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
323{
324 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
325 void *tmp = ESP_SKB_CB(skb)->tmp;
0146dca7 326 __be32 *seqhi = esp_tmp_extra(tmp);
000ae7b2
HX		 327
328 esph->seq_no = esph->spi;
329 esph->spi = *seqhi;
330}
331
332static void esp_output_restore_header(struct sk_buff *skb)
333{
0146dca7
SD		 334 void *tmp = ESP_SKB_CB(skb)->tmp;
335 struct esp_output_extra *extra = esp_tmp_extra(tmp);
336
337 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
338 sizeof(__be32));
000ae7b2
HX		 339}
340
03e2a30f 341static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
383d0350 342 struct xfrm_state *x,
03e2a30f 343 struct ip_esp_hdr *esph,
0146dca7 344 struct esp_output_extra *extra)
03e2a30f 345{
03e2a30f
SK		 346 /* For ESN we move the header forward by 4 bytes to
347 * accomodate the high bits. We will move it back after
348 * encryption.
349 */
350 if ((x->props.flags & XFRM_STATE_ESN)) {
0146dca7 351 __u32 seqhi;
7862b405
SK		 352 struct xfrm_offload *xo = xfrm_offload(skb);
353
7862b405 354 if (xo)
0146dca7 355 seqhi = xo->seq.hi;
7862b405 356 else
0146dca7
SD		 357 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
358
359 extra->esphoff = (unsigned char *)esph -
360 skb_transport_header(skb);
361 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
362 extra->seqhi = esph->spi;
363 esph->seq_no = htonl(seqhi);
03e2a30f
SK		 364 }
365
366 esph->spi = x->id.spi;
367
368 return esph;
369}
370
000ae7b2
HX		 371static void esp_output_done_esn(struct crypto_async_request *base, int err)
372{
373 struct sk_buff *skb = base->data;
374
375 esp_output_restore_header(skb);
376 esp_output_done(base, err);
377}
378
0146dca7
SD		 379static struct ip_esp_hdr *esp6_output_udp_encap(struct sk_buff *skb,
380 int encap_type,
381 struct esp_info *esp,
382 __be16 sport,
383 __be16 dport)
384{
385 struct udphdr *uh;
386 __be32 *udpdata32;
387 unsigned int len;
388
389 len = skb->len + esp->tailen - skb_transport_offset(skb);
390 if (len > U16_MAX)
391 return ERR_PTR(-EMSGSIZE);
392
393 uh = (struct udphdr *)esp->esph;
394 uh->source = sport;
395 uh->dest = dport;
396 uh->len = htons(len);
397 uh->check = 0;
398
399 *skb_mac_header(skb) = IPPROTO_UDP;
400
401 if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
402 udpdata32 = (__be32 *)(uh + 1);
403 udpdata32[0] = udpdata32[1] = 0;
404 return (struct ip_esp_hdr *)(udpdata32 + 2);
405 }
406
407 return (struct ip_esp_hdr *)(uh + 1);
408}
409
26333c37
SD		 410#ifdef CONFIG_INET6_ESPINTCP
411static struct ip_esp_hdr *esp6_output_tcp_encap(struct xfrm_state *x,
412 struct sk_buff *skb,
413 struct esp_info *esp)
414{
415 __be16 *lenp = (void *)esp->esph;
416 struct ip_esp_hdr *esph;
417 unsigned int len;
418 struct sock *sk;
419
420 len = skb->len + esp->tailen - skb_transport_offset(skb);
421 if (len > IP_MAX_MTU)
422 return ERR_PTR(-EMSGSIZE);
423
424 rcu_read_lock();
425 sk = esp6_find_tcp_sk(x);
426 rcu_read_unlock();
427
428 if (IS_ERR(sk))
429 return ERR_CAST(sk);
430
431 *lenp = htons(len);
432 esph = (struct ip_esp_hdr *)(lenp + 1);
433
434 return esph;
435}
436#else
437static struct ip_esp_hdr *esp6_output_tcp_encap(struct xfrm_state *x,
438 struct sk_buff *skb,
439 struct esp_info *esp)
440{
441 return ERR_PTR(-EOPNOTSUPP);
442}
443#endif
444
0146dca7
SD		 445static int esp6_output_encap(struct xfrm_state *x, struct sk_buff *skb,
446 struct esp_info *esp)
447{
448 struct xfrm_encap_tmpl *encap = x->encap;
449 struct ip_esp_hdr *esph;
450 __be16 sport, dport;
451 int encap_type;
452
453 spin_lock_bh(&x->lock);
454 sport = encap->encap_sport;
455 dport = encap->encap_dport;
456 encap_type = encap->encap_type;
457 spin_unlock_bh(&x->lock);
458
459 switch (encap_type) {
460 default:
461 case UDP_ENCAP_ESPINUDP:
462 case UDP_ENCAP_ESPINUDP_NON_IKE:
463 esph = esp6_output_udp_encap(skb, encap_type, esp, sport, dport);
464 break;
26333c37
SD		 465 case TCP_ENCAP_ESPINTCP:
466 esph = esp6_output_tcp_encap(x, skb, esp);
467 break;
0146dca7
SD		 468 }
469
470 if (IS_ERR(esph))
471 return PTR_ERR(esph);
472
473 esp->esph = esph;
474
475 return 0;
476}
477
383d0350 478int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
1da177e4 479{
27a884dc 480 u8 *tail;
383d0350 481 int nfrags;
0146dca7 482 int esph_offset;
383d0350 483 struct page *page;
383d0350
SK		 484 struct sk_buff *trailer;
485 int tailen = esp->tailen;
d212a4c2 486
0146dca7
SD		 487 if (x->encap) {
488 int err = esp6_output_encap(x, skb, esp);
489
490 if (err < 0)
491 return err;
492 }
493
03e2a30f 494 if (!skb_cloned(skb)) {
54ffd790 495 if (tailen <= skb_tailroom(skb)) {
03e2a30f
SK		 496 nfrags = 1;
497 trailer = skb;
498 tail = skb_tail_pointer(trailer);
499
500 goto skip_cow;
501 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
502 && !skb_has_frag_list(skb)) {
503 int allocsize;
504 struct sock *sk = skb->sk;
505 struct page_frag *pfrag = &x->xfrag;
506
383d0350
SK		 507 esp->inplace = false;
508
03e2a30f
SK		 509 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
510
511 spin_lock_bh(&x->lock);
512
513 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
514 spin_unlock_bh(&x->lock);
515 goto cow;
516 }
517
518 page = pfrag->page;
519 get_page(page);
520
9bd6b629 521 tail = page_address(page) + pfrag->offset;
03e2a30f 522
383d0350 523 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
03e2a30f 524
03e2a30f
SK		 525 nfrags = skb_shinfo(skb)->nr_frags;
526
527 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
528 tailen);
529 skb_shinfo(skb)->nr_frags = ++nfrags;
530
531 pfrag->offset = pfrag->offset + allocsize;
36ff0dd3
SK		 532
533 spin_unlock_bh(&x->lock);
534
03e2a30f
SK		 535 nfrags++;
536
537 skb->len += tailen;
538 skb->data_len += tailen;
539 skb->truesize += tailen;
09db5124 540 if (sk && sk_fullsock(sk))
14afee4b 541 refcount_add(tailen, &sk->sk_wmem_alloc);
03e2a30f 542
383d0350 543 goto out;
03e2a30f 544 }
48f125ce 545 }
38320c70 546
03e2a30f 547cow:
0146dca7
SD		 548 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
549
383d0350
SK		 550 nfrags = skb_cow_data(skb, tailen, &trailer);
551 if (nfrags < 0)
552 goto out;
27a884dc 553 tail = skb_tail_pointer(trailer);
0146dca7 554 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
03e2a30f
SK		 555
556skip_cow:
383d0350
SK		 557 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
558 pskb_put(skb, trailer, tailen);
1da177e4 559
383d0350
SK		 560out:
561 return nfrags;
562}
563EXPORT_SYMBOL_GPL(esp6_output_head);
1da177e4 564
383d0350
SK		 565int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
566{
567 u8 *iv;
568 int alen;
569 void *tmp;
570 int ivlen;
571 int assoclen;
0146dca7 572 int extralen;
383d0350
SK		 573 struct page *page;
574 struct ip_esp_hdr *esph;
575 struct aead_request *req;
576 struct crypto_aead *aead;
577 struct scatterlist *sg, *dsg;
0146dca7 578 struct esp_output_extra *extra;
383d0350
SK		 579 int err = -ENOMEM;
580
581 assoclen = sizeof(struct ip_esp_hdr);
0146dca7 582 extralen = 0;
383d0350
SK		 583
584 if (x->props.flags & XFRM_STATE_ESN) {
0146dca7 585 extralen += sizeof(*extra);
383d0350
SK		 586 assoclen += sizeof(__be32);
587 }
1da177e4 588
383d0350
SK		 589 aead = x->data;
590 alen = crypto_aead_authsize(aead);
591 ivlen = crypto_aead_ivsize(aead);
592
0146dca7 593 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
e892d2d4 594 if (!tmp)
03e2a30f 595 goto error;
000ae7b2 596
0146dca7
SD		 597 extra = esp_tmp_extra(tmp);
598 iv = esp_tmp_iv(aead, tmp, extralen);
03e2a30f
SK		 599 req = esp_tmp_req(aead, iv);
600 sg = esp_req_sg(aead, req);
03e2a30f 601
383d0350
SK		 602 if (esp->inplace)
603 dsg = sg;
604 else
605 dsg = &sg[esp->nfrags];
606
0146dca7
SD		 607 esph = esp_output_set_esn(skb, x, esp->esph, extra);
608 esp->esph = esph;
000ae7b2 609
383d0350 610 sg_init_table(sg, esp->nfrags);
3f297707
JD		 611 err = skb_to_sgvec(skb, sg,
612 (unsigned char *)esph - skb->data,
613 assoclen + ivlen + esp->clen + alen);
614 if (unlikely(err < 0))
e6194923 615 goto error_free;
383d0350
SK		 616
617 if (!esp->inplace) {
618 int allocsize;
619 struct page_frag *pfrag = &x->xfrag;
620
621 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
622
623 spin_lock_bh(&x->lock);
624 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
625 spin_unlock_bh(&x->lock);
e6194923 626 goto error_free;
383d0350
SK		 627 }
628
629 skb_shinfo(skb)->nr_frags = 1;
630
631 page = pfrag->page;
632 get_page(page);
633 /* replace page frags in skb with new page */
634 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
635 pfrag->offset = pfrag->offset + allocsize;
636 spin_unlock_bh(&x->lock);
637
638 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
3f297707
JD		 639 err = skb_to_sgvec(skb, dsg,
640 (unsigned char *)esph - skb->data,
641 assoclen + ivlen + esp->clen + alen);
642 if (unlikely(err < 0))
e6194923 643 goto error_free;
383d0350 644 }
d212a4c2 645
03e2a30f
SK		 646 if ((x->props.flags & XFRM_STATE_ESN))
647 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
648 else
649 aead_request_set_callback(req, 0, esp_output_done, skb);
650
383d0350 651 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
000ae7b2
HX		 652 aead_request_set_ad(req, assoclen);
653
000ae7b2 654 memset(iv, 0, ivlen);
383d0350 655 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
000ae7b2 656 min(ivlen, 8));
1da177e4 657
38320c70 658 ESP_SKB_CB(skb)->tmp = tmp;
000ae7b2
HX		 659 err = crypto_aead_encrypt(req);
660
661 switch (err) {
662 case -EINPROGRESS:
38320c70 663 goto error;
1da177e4 664
068c2e70 665 case -ENOSPC:
38320c70 666 err = NET_XMIT_DROP;
000ae7b2
HX		 667 break;
668
669 case 0:
670 if ((x->props.flags & XFRM_STATE_ESN))
671 esp_output_restore_header(skb);
0146dca7 672 esp_output_encap_csum(skb);
000ae7b2 673 }
38320c70 674
03e2a30f
SK		 675 if (sg != dsg)
676 esp_ssg_unref(x, tmp);
38320c70 677
26333c37
SD		 678 if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
679 err = esp_output_tail_tcp(x, skb);
680
e6194923
SK		 681error_free:
682 kfree(tmp);
38320c70
HX		 683error:
684 return err;
685}
383d0350
SK		 686EXPORT_SYMBOL_GPL(esp6_output_tail);
687
688static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
689{
690 int alen;
691 int blksize;
692 struct ip_esp_hdr *esph;
693 struct crypto_aead *aead;
694 struct esp_info esp;
695
696 esp.inplace = true;
697
698 esp.proto = *skb_mac_header(skb);
699 *skb_mac_header(skb) = IPPROTO_ESP;
700
701 /* skb is pure payload to encrypt */
702
703 aead = x->data;
704 alen = crypto_aead_authsize(aead);
705
706 esp.tfclen = 0;
707 if (x->tfcpad) {
708 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
709 u32 padto;
710
c7b37c76 711 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
383d0350
SK		 712 if (skb->len < padto)
713 esp.tfclen = padto - skb->len;
714 }
715 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
716 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
717 esp.plen = esp.clen - skb->len - esp.tfclen;
718 esp.tailen = esp.tfclen + esp.plen + alen;
719
0146dca7
SD		 720 esp.esph = ip_esp_hdr(skb);
721
383d0350
SK		 722 esp.nfrags = esp6_output_head(x, skb, &esp);
723 if (esp.nfrags < 0)
724 return esp.nfrags;
725
0146dca7 726 esph = esp.esph;
383d0350
SK		 727 esph->spi = x->id.spi;
728
729 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
730 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
731 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
732
733 skb_push(skb, -skb_network_offset(skb));
734
735 return esp6_output_tail(x, skb, &esp);
736}
38320c70 737
47ebcc0b 738static inline int esp_remove_trailer(struct sk_buff *skb)
38320c70
HX		 739{
740 struct xfrm_state *x = xfrm_input_state(skb);
d77e38e6 741 struct xfrm_offload *xo = xfrm_offload(skb);
1c5ad13f 742 struct crypto_aead *aead = x->data;
47ebcc0b 743 int alen, hlen, elen;
e51a6472
IT		 744 int padlen, trimlen;
745 __wsum csumdiff;
38320c70 746 u8 nexthdr[2];
47ebcc0b 747 int ret;
38320c70 748
47ebcc0b
YK		 749 alen = crypto_aead_authsize(aead);
750 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
751 elen = skb->len - hlen;
1da177e4 752
47ebcc0b
YK		 753 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
754 ret = xo->proto;
38320c70 755 goto out;
47ebcc0b 756 }
6b7326c8 757
eee12df5
GS		 758 ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
759 BUG_ON(ret);
1da177e4 760
47ebcc0b 761 ret = -EINVAL;
38320c70
HX		 762 padlen = nexthdr[0];
763 if (padlen + 2 + alen >= elen) {
ba7a46f1
JP		 764 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
765 padlen + 2, elen - alen);
38320c70 766 goto out;
1da177e4
LT		 767 }
768
e51a6472
IT		 769 trimlen = alen + padlen + 2;
770 if (skb->ip_summed == CHECKSUM_COMPLETE) {
771 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
772 skb->csum = csum_block_sub(skb->csum, csumdiff,
773 skb->len - trimlen);
774 }
775 pskb_trim(skb, skb->len - trimlen);
776
47ebcc0b
YK		 777 ret = nexthdr[1];
778
779out:
780 return ret;
781}
782
783int esp6_input_done2(struct sk_buff *skb, int err)
784{
785 struct xfrm_state *x = xfrm_input_state(skb);
786 struct xfrm_offload *xo = xfrm_offload(skb);
787 struct crypto_aead *aead = x->data;
788 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
789 int hdr_len = skb_network_header_len(skb);
790
bf3da527 791 if (!xo || !(xo->flags & CRYPTO_DONE))
47ebcc0b
YK		 792 kfree(ESP_SKB_CB(skb)->tmp);
793
794 if (unlikely(err))
795 goto out;
796
797 err = esp_remove_trailer(skb);
798 if (unlikely(err < 0))
799 goto out;
800
0146dca7
SD		 801 if (x->encap) {
802 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
17175d1a 803 int offset = skb_network_offset(skb) + sizeof(*ip6h);
0146dca7 804 struct xfrm_encap_tmpl *encap = x->encap;
17175d1a
SD		 805 u8 nexthdr = ip6h->nexthdr;
806 __be16 frag_off, source;
807 struct udphdr *uh;
808 struct tcphdr *th;
809
810 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
811 uh = (void *)(skb->data + offset);
812 th = (void *)(skb->data + offset);
d5dba137 813 hdr_len += offset;
0146dca7
SD		 814
815 switch (x->encap->encap_type) {
26333c37
SD		 816 case TCP_ENCAP_ESPINTCP:
817 source = th->source;
818 break;
0146dca7
SD		 819 case UDP_ENCAP_ESPINUDP:
820 case UDP_ENCAP_ESPINUDP_NON_IKE:
821 source = uh->source;
822 break;
823 default:
824 WARN_ON_ONCE(1);
825 err = -EINVAL;
826 goto out;
827 }
828
829 /*
830 * 1) if the NAT-T peer's IP or port changed then
831 * advertize the change to the keying daemon.
832 * This is an inbound SA, so just compare
833 * SRC ports.
834 */
835 if (!ipv6_addr_equal(&ip6h->saddr, &x->props.saddr.in6) ||
836 source != encap->encap_sport) {
837 xfrm_address_t ipaddr;
838
839 memcpy(&ipaddr.a6, &ip6h->saddr.s6_addr, sizeof(ipaddr.a6));
840 km_new_mapping(x, &ipaddr, source);
841
842 /* XXX: perhaps add an extra
843 * policy check here, to see
844 * if we should allow or
845 * reject a packet from a
846 * different source
847 * address/port.
848 */
849 }
850
851 /*
852 * 2) ignore UDP/TCP checksums in case
853 * of NAT-T in Transport Mode, or
854 * perform other post-processing fixes
855 * as per draft-ietf-ipsec-udp-encaps-06,
856 * section 3.1.2
857 */
858 if (x->props.mode == XFRM_MODE_TRANSPORT)
859 skb->ip_summed = CHECKSUM_UNNECESSARY;
860 }
861
47ebcc0b
YK		 862 skb_postpull_rcsum(skb, skb_network_header(skb),
863 skb_network_header_len(skb));
e51a6472 864 skb_pull_rcsum(skb, hlen);
a9403f8a
LR		 865 if (x->props.mode == XFRM_MODE_TUNNEL)
866 skb_reset_transport_header(skb);
867 else
868 skb_set_transport_header(skb, -hdr_len);
38320c70 869
38320c70
HX		 870 /* RFC4303: Drop dummy packets without any error */
871 if (err == IPPROTO_NONE)
872 err = -EINVAL;
873
874out:
1da177e4
LT		 875 return err;
876}
383d0350 877EXPORT_SYMBOL_GPL(esp6_input_done2);
1da177e4 878
38320c70
HX		 879static void esp_input_done(struct crypto_async_request *base, int err)
880{
881 struct sk_buff *skb = base->data;
882
f1fbed0e 883 xfrm_input_resume(skb, esp6_input_done2(skb, err));
38320c70
HX		 884}
885
000ae7b2
HX		 886static void esp_input_restore_header(struct sk_buff *skb)
887{
888 esp_restore_header(skb, 0);
889 __skb_pull(skb, 4);
890}
891
03e2a30f
SK		 892static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
893{
894 struct xfrm_state *x = xfrm_input_state(skb);
03e2a30f
SK		 895
896 /* For ESN we move the header forward by 4 bytes to
897 * accomodate the high bits. We will move it back after
898 * decryption.
899 */
900 if ((x->props.flags & XFRM_STATE_ESN)) {
d3cc547d
CIK		 901 struct ip_esp_hdr *esph = skb_push(skb, 4);
902
03e2a30f
SK		 903 *seqhi = esph->spi;
904 esph->spi = esph->seq_no;
905 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
906 }
907}
908
000ae7b2
HX		 909static void esp_input_done_esn(struct crypto_async_request *base, int err)
910{
911 struct sk_buff *skb = base->data;
912
913 esp_input_restore_header(skb);
914 esp_input_done(base, err);
915}
916
e695633e 917static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
1da177e4 918{
1c5ad13f 919 struct crypto_aead *aead = x->data;
38320c70 920 struct aead_request *req;
1da177e4 921 struct sk_buff *trailer;
000ae7b2 922 int ivlen = crypto_aead_ivsize(aead);
0c05f983 923 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
1da177e4 924 int nfrags;
d212a4c2 925 int assoclen;
d212a4c2 926 int seqhilen;
1da177e4 927 int ret = 0;
38320c70 928 void *tmp;
d212a4c2 929 __be32 *seqhi;
38320c70
HX		 930 u8 *iv;
931 struct scatterlist *sg;
1da177e4 932
0c05f983 933 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen)) {
1da177e4 934 ret = -EINVAL;
31a4ab93 935 goto out;
1da177e4
LT		 936 }
937
38320c70 938 if (elen <= 0) {
1da177e4 939 ret = -EINVAL;
31a4ab93 940 goto out;
1da177e4 941 }
1da177e4 942
0c05f983 943 assoclen = sizeof(struct ip_esp_hdr);
d212a4c2
SK		 944 seqhilen = 0;
945
946 if (x->props.flags & XFRM_STATE_ESN) {
d212a4c2
SK		 947 seqhilen += sizeof(__be32);
948 assoclen += seqhilen;
949 }
950
03e2a30f
SK		 951 if (!skb_cloned(skb)) {
952 if (!skb_is_nonlinear(skb)) {
953 nfrags = 1;
954
955 goto skip_cow;
956 } else if (!skb_has_frag_list(skb)) {
957 nfrags = skb_shinfo(skb)->nr_frags;
958 nfrags++;
959
960 goto skip_cow;
961 }
962 }
963
964 nfrags = skb_cow_data(skb, 0, &trailer);
965 if (nfrags < 0) {
966 ret = -EINVAL;
967 goto out;
968 }
969
970skip_cow:
971 ret = -ENOMEM;
000ae7b2 972 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
38320c70
HX		 973 if (!tmp)
974 goto out;
1da177e4 975
38320c70 976 ESP_SKB_CB(skb)->tmp = tmp;
0146dca7 977 seqhi = esp_tmp_extra(tmp);
d212a4c2 978 iv = esp_tmp_iv(aead, tmp, seqhilen);
38320c70 979 req = esp_tmp_req(aead, iv);
000ae7b2 980 sg = esp_req_sg(aead, req);
1da177e4 981
03e2a30f 982 esp_input_set_header(skb, seqhi);
1da177e4 983
03e2a30f 984 sg_init_table(sg, nfrags);
3f297707 985 ret = skb_to_sgvec(skb, sg, 0, skb->len);
7284fdf3
ZL		 986 if (unlikely(ret < 0)) {
987 kfree(tmp);
3f297707 988 goto out;
7284fdf3 989 }
1da177e4 990
03e2a30f 991 skb->ip_summed = CHECKSUM_NONE;
d212a4c2 992
03e2a30f 993 if ((x->props.flags & XFRM_STATE_ESN))
000ae7b2 994 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
03e2a30f
SK		 995 else
996 aead_request_set_callback(req, 0, esp_input_done, skb);
000ae7b2
HX		 997
998 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
999 aead_request_set_ad(req, assoclen);
1da177e4 1000
38320c70
HX		 1001 ret = crypto_aead_decrypt(req);
1002 if (ret == -EINPROGRESS)
1003 goto out;
95a02cfd 1004
000ae7b2
HX		 1005 if ((x->props.flags & XFRM_STATE_ESN))
1006 esp_input_restore_header(skb);
1007
f1fbed0e 1008 ret = esp6_input_done2(skb, ret);
1da177e4
LT		 1009
1010out:
1da177e4
LT		 1011 return ret;
1012}
1013
d5860c5c
SK		 1014static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
1015 u8 type, u8 code, int offset, __be32 info)
1da177e4 1016{
4fb236ba 1017 struct net *net = dev_net(skb->dev);
b71d1d42 1018 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
87bdc48d 1019 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
1da177e4
LT		 1020 struct xfrm_state *x;
1021
b3b2b9e1 1022 if (type != ICMPV6_PKT_TOOBIG &&
ec18d9a2 1023 type != NDISC_REDIRECT)
d5860c5c 1024 return 0;
1da177e4 1025
b71d1d42
ED		 1026 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
1027 esph->spi, IPPROTO_ESP, AF_INET6);
1da177e4 1028 if (!x)
d5860c5c 1029 return 0;
ec18d9a2
DM		 1030
1031 if (type == NDISC_REDIRECT)
e2d118a1
LC		 1032 ip6_redirect(skb, net, skb->dev->ifindex, 0,
1033 sock_net_uid(net, NULL));
ec18d9a2 1034 else
e2d118a1 1035 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
1da177e4 1036 xfrm_state_put(x);
d5860c5c
SK		 1037
1038 return 0;
1da177e4
LT		 1039}
1040
1041static void esp6_destroy(struct xfrm_state *x)
1042{
1c5ad13f 1043 struct crypto_aead *aead = x->data;
1da177e4 1044
1c5ad13f 1045 if (!aead)
1da177e4
LT		 1046 return;
1047
1c5ad13f 1048 crypto_free_aead(aead);
1da177e4
LT		 1049}
1050
1a6509d9
HX		 1051static int esp_init_aead(struct xfrm_state *x)
1052{
000ae7b2 1053 char aead_name[CRYPTO_MAX_ALG_NAME];
1a6509d9
HX		 1054 struct crypto_aead *aead;
1055 int err;
1056
000ae7b2
HX		 1057 err = -ENAMETOOLONG;
1058 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
1059 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
1060 goto error;
1061
f58869c4 1062 aead = crypto_alloc_aead(aead_name, 0, 0);
1a6509d9
HX		 1063 err = PTR_ERR(aead);
1064 if (IS_ERR(aead))
1065 goto error;
1066
1c5ad13f 1067 x->data = aead;
1a6509d9
HX		 1068
1069 err = crypto_aead_setkey(aead, x->aead->alg_key,
1070 (x->aead->alg_key_len + 7) / 8);
1071 if (err)
1072 goto error;
1073
1074 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
1075 if (err)
1076 goto error;
1077
1078error:
1079 return err;
1080}
1081
1082static int esp_init_authenc(struct xfrm_state *x)
1da177e4 1083{
38320c70
HX		 1084 struct crypto_aead *aead;
1085 struct crypto_authenc_key_param *param;
1086 struct rtattr *rta;
1087 char *key;
1088 char *p;
1089 char authenc_name[CRYPTO_MAX_ALG_NAME];
38320c70
HX		 1090 unsigned int keylen;
1091 int err;
1da177e4 1092
1a6509d9 1093 err = -EINVAL;
63159f29 1094 if (!x->ealg)
1a6509d9 1095 goto error;
38320c70 1096
1a6509d9 1097 err = -ENAMETOOLONG;
d212a4c2
SK		 1098
1099 if ((x->props.flags & XFRM_STATE_ESN)) {
1100 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
000ae7b2
HX		 1101 "%s%sauthencesn(%s,%s)%s",
1102 x->geniv ?: "", x->geniv ? "(" : "",
d212a4c2 1103 x->aalg ? x->aalg->alg_name : "digest_null",
000ae7b2
HX		 1104 x->ealg->alg_name,
1105 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
d212a4c2
SK		 1106 goto error;
1107 } else {
1108 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
000ae7b2
HX		 1109 "%s%sauthenc(%s,%s)%s",
1110 x->geniv ?: "", x->geniv ? "(" : "",
d212a4c2 1111 x->aalg ? x->aalg->alg_name : "digest_null",
000ae7b2
HX		 1112 x->ealg->alg_name,
1113 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
d212a4c2
SK		 1114 goto error;
1115 }
38320c70 1116
f58869c4 1117 aead = crypto_alloc_aead(authenc_name, 0, 0);
38320c70
HX		 1118 err = PTR_ERR(aead);
1119 if (IS_ERR(aead))
1120 goto error;
1121
1c5ad13f 1122 x->data = aead;
38320c70
HX		 1123
1124 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
1125 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
1126 err = -ENOMEM;
1127 key = kmalloc(keylen, GFP_KERNEL);
1128 if (!key)
1129 goto error;
1130
1131 p = key;
1132 rta = (void *)p;
1133 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1134 rta->rta_len = RTA_LENGTH(sizeof(*param));
1135 param = RTA_DATA(rta);
1136 p += RTA_SPACE(sizeof(*param));
1137
1da177e4
LT		 1138 if (x->aalg) {
1139 struct xfrm_algo_desc *aalg_desc;
1140
38320c70
HX		 1141 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
1142 p += (x->aalg->alg_key_len + 7) / 8;
1ab1457c 1143
1da177e4
LT		 1144 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
1145 BUG_ON(!aalg_desc);
1ab1457c 1146
38320c70 1147 err = -EINVAL;
45083497 1148 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
38320c70 1149 crypto_aead_authsize(aead)) {
6ad2dd6c 1150 pr_info("ESP: %s digestsize %u != %u\n",
45083497
JP		 1151 x->aalg->alg_name,
1152 crypto_aead_authsize(aead),
1153 aalg_desc->uinfo.auth.icv_fullbits / 8);
38320c70 1154 goto free_key;
1da177e4 1155 }
1ab1457c 1156
38320c70 1157 err = crypto_aead_setauthsize(
8f8a088c 1158 aead, x->aalg->alg_trunc_len / 8);
38320c70
HX		 1159 if (err)
1160 goto free_key;
1da177e4 1161 }
38320c70 1162
38320c70
HX		 1163 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
1164 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
1165
1166 err = crypto_aead_setkey(aead, key, keylen);
1167
1168free_key:
1169 kfree(key);
1170
1a6509d9
HX		 1171error:
1172 return err;
1173}
1174
1175static int esp6_init_state(struct xfrm_state *x)
1176{
1a6509d9
HX		 1177 struct crypto_aead *aead;
1178 u32 align;
1179 int err;
1180
1c5ad13f 1181 x->data = NULL;
1a6509d9
HX		 1182
1183 if (x->aead)
1184 err = esp_init_aead(x);
1185 else
1186 err = esp_init_authenc(x);
1187
38320c70 1188 if (err)
1da177e4 1189 goto error;
38320c70 1190
1c5ad13f 1191 aead = x->data;
1a6509d9 1192
38320c70
HX		 1193 x->props.header_len = sizeof(struct ip_esp_hdr) +
1194 crypto_aead_ivsize(aead);
ca68145f
HX		 1195 switch (x->props.mode) {
1196 case XFRM_MODE_BEET:
abf5cdb8
JK		 1197 if (x->sel.family != AF_INET6)
1198 x->props.header_len += IPV4_BEET_PHMAXLEN +
67ba4152 1199 (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
abf5cdb8 1200 break;
bcfd09f7 1201 default:
ca68145f
HX		 1202 case XFRM_MODE_TRANSPORT:
1203 break;
1204 case XFRM_MODE_TUNNEL:
1da177e4 1205 x->props.header_len += sizeof(struct ipv6hdr);
ea2c47b4 1206 break;
ca68145f 1207 }
38320c70 1208
0146dca7
SD		 1209 if (x->encap) {
1210 struct xfrm_encap_tmpl *encap = x->encap;
1211
1212 switch (encap->encap_type) {
1213 default:
1214 err = -EINVAL;
1215 goto error;
1216 case UDP_ENCAP_ESPINUDP:
1217 x->props.header_len += sizeof(struct udphdr);
1218 break;
1219 case UDP_ENCAP_ESPINUDP_NON_IKE:
1220 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
1221 break;
26333c37
SD		 1222#ifdef CONFIG_INET6_ESPINTCP
1223 case TCP_ENCAP_ESPINTCP:
1224 /* only the length field, TCP encap is done by
1225 * the socket
1226 */
1227 x->props.header_len += 2;
1228 break;
1229#endif
0146dca7
SD		 1230 }
1231 }
1232
38320c70 1233 align = ALIGN(crypto_aead_blocksize(aead), 4);
1c5ad13f 1234 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1da177e4
LT		 1235
1236error:
38320c70 1237 return err;
1da177e4
LT		 1238}
1239
d5860c5c
SK		 1240static int esp6_rcv_cb(struct sk_buff *skb, int err)
1241{
1242 return 0;
1243}
1244
cc24beca 1245static const struct xfrm_type esp6_type = {
1da177e4 1246 .description = "ESP6",
cc24beca
IM		 1247 .owner = THIS_MODULE,
1248 .proto = IPPROTO_ESP,
436a0a40 1249 .flags = XFRM_TYPE_REPLAY_PROT,
1da177e4
LT		 1250 .init_state = esp6_init_state,
1251 .destructor = esp6_destroy,
1da177e4 1252 .input = esp6_input,
aee5adb4
MN		 1253 .output = esp6_output,
1254 .hdr_offset = xfrm6_find_1stfragopt,
1da177e4
LT		 1255};
1256
d5860c5c
SK		 1257static struct xfrm6_protocol esp6_protocol = {
1258 .handler = xfrm6_rcv,
0146dca7 1259 .input_handler = xfrm_input,
d5860c5c 1260 .cb_handler = esp6_rcv_cb,
1da177e4 1261 .err_handler = esp6_err,
d5860c5c 1262 .priority = 0,
1da177e4
LT		 1263};
1264
1265static int __init esp6_init(void)
1266{
1267 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
f3213831 1268 pr_info("%s: can't add xfrm type\n", __func__);
1da177e4
LT		 1269 return -EAGAIN;
1270 }
d5860c5c 1271 if (xfrm6_protocol_register(&esp6_protocol, IPPROTO_ESP) < 0) {
f3213831 1272 pr_info("%s: can't add protocol\n", __func__);
1da177e4
LT		 1273 xfrm_unregister_type(&esp6_type, AF_INET6);
1274 return -EAGAIN;
1275 }
1276
1277 return 0;
1278}
1279
1280static void __exit esp6_fini(void)
1281{
d5860c5c 1282 if (xfrm6_protocol_deregister(&esp6_protocol, IPPROTO_ESP) < 0)
f3213831 1283 pr_info("%s: can't remove protocol\n", __func__);
4f518e80 1284 xfrm_unregister_type(&esp6_type, AF_INET6);
1da177e4
LT		 1285}
1286
1287module_init(esp6_init);
1288module_exit(esp6_fini);
1289
1290MODULE_LICENSE("GPL");
d3d6dd3a 1291MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);
Linux 6.x block layer and io_uring tree(s)