1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C)2002 USAGI/WIDE Project |
4 | * |
5 | * Authors |
6 | * |
7 | * Mitsuru KANDA @USAGI : IPv6 Support |
8 | * Kazunori MIYAZAWA @USAGI : |
9 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> |
10 | * |
11 | * This file is derived from net/ipv4/esp.c |
12 | */ |
13 | |
14 | #define pr_fmt(fmt) "IPv6: " fmt |
15 | |
16 | #include <crypto/aead.h> |
17 | #include <crypto/authenc.h> |
18 | #include <linux/err.h> |
19 | #include <linux/module.h> |
20 | #include <net/ip.h> |
21 | #include <net/xfrm.h> |
22 | #include <net/esp.h> |
23 | #include <linux/scatterlist.h> |
24 | #include <linux/kernel.h> |
25 | #include <linux/pfkeyv2.h> |
26 | #include <linux/random.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> |
29 | #include <net/ip6_checksum.h> |
30 | #include <net/ip6_route.h> |
31 | #include <net/icmp.h> |
32 | #include <net/ipv6.h> |
33 | #include <net/protocol.h> |
34 | #include <net/udp.h> |
35 | #include <linux/icmpv6.h> |
36 | #include <net/tcp.h> |
37 | #include <net/espintcp.h> |
38 | #include <net/inet6_hashtables.h> |
39 | |
40 | #include <linux/highmem.h> |
41 | |
42 | struct esp_skb_cb { |
43 | struct xfrm_skb_cb xfrm; |
44 | void *tmp; |
45 | }; |
46 | |
47 | struct { |
48 | __be32 ; |
49 | u32 ; |
50 | }; |
51 | |
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 | * |
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. |
60 | * |
61 | * TODO: Use spare space in skb for this where possible. |
62 | */ |
63 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int seqihlen) |
64 | { |
65 | unsigned int len; |
66 | |
67 | len = seqihlen; |
68 | |
69 | len += crypto_aead_ivsize(tfm: aead); |
70 | |
71 | if (len) { |
72 | len += crypto_aead_alignmask(tfm: aead) & |
73 | ~(crypto_tfm_ctx_alignment() - 1); |
74 | len = ALIGN(len, crypto_tfm_ctx_alignment()); |
75 | } |
76 | |
77 | len += sizeof(struct aead_request) + crypto_aead_reqsize(tfm: aead); |
78 | len = ALIGN(len, __alignof__(struct scatterlist)); |
79 | |
80 | len += sizeof(struct scatterlist) * nfrags; |
81 | |
82 | return kmalloc(size: len, GFP_ATOMIC); |
83 | } |
84 | |
85 | static inline void *(void *tmp) |
86 | { |
87 | return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra)); |
88 | } |
89 | |
90 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int seqhilen) |
91 | { |
92 | return crypto_aead_ivsize(tfm: aead) ? |
93 | PTR_ALIGN((u8 *)tmp + seqhilen, |
94 | crypto_aead_alignmask(aead) + 1) : tmp + seqhilen; |
95 | } |
96 | |
97 | static 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, tfm: aead); |
104 | return req; |
105 | } |
106 | |
107 | static 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 | |
115 | static void esp_ssg_unref(struct xfrm_state *x, void *tmp) |
116 | { |
117 | struct crypto_aead *aead = x->data; |
118 | int = 0; |
119 | u8 *iv; |
120 | struct aead_request *req; |
121 | struct scatterlist *sg; |
122 | |
123 | if (x->props.flags & XFRM_STATE_ESN) |
124 | extralen += sizeof(struct esp_output_extra); |
125 | |
126 | iv = esp_tmp_iv(aead, tmp, seqhilen: extralen); |
127 | req = esp_tmp_req(aead, iv); |
128 | |
129 | /* Unref skb_frag_pages in the src scatterlist if necessary. |
130 | * Skip the first sg which comes from skb->data. |
131 | */ |
132 | if (req->src != req->dst) |
133 | for (sg = sg_next(req->src); sg; sg = sg_next(sg)) |
134 | put_page(page: sg_page(sg)); |
135 | } |
136 | |
137 | #ifdef CONFIG_INET6_ESPINTCP |
138 | struct esp_tcp_sk { |
139 | struct sock *sk; |
140 | struct rcu_head rcu; |
141 | }; |
142 | |
143 | static void esp_free_tcp_sk(struct rcu_head *head) |
144 | { |
145 | struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu); |
146 | |
147 | sock_put(sk: esk->sk); |
148 | kfree(objp: esk); |
149 | } |
150 | |
151 | static struct sock *esp6_find_tcp_sk(struct xfrm_state *x) |
152 | { |
153 | struct xfrm_encap_tmpl *encap = x->encap; |
154 | struct net *net = xs_net(x); |
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(lock: &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(size: sizeof(*esk), GFP_ATOMIC); |
171 | if (!esk) { |
172 | spin_unlock_bh(lock: &x->lock); |
173 | return ERR_PTR(error: -ENOMEM); |
174 | } |
175 | RCU_INIT_POINTER(x->encap_sk, NULL); |
176 | esk->sk = sk; |
177 | call_rcu(head: &esk->rcu, func: esp_free_tcp_sk); |
178 | } |
179 | spin_unlock_bh(lock: &x->lock); |
180 | |
181 | sk = __inet6_lookup_established(net, hashinfo: net->ipv4.tcp_death_row.hashinfo, saddr: &x->id.daddr.in6, |
182 | sport: dport, daddr: &x->props.saddr.in6, ntohs(sport), dif: 0, sdif: 0); |
183 | if (!sk) |
184 | return ERR_PTR(error: -ENOENT); |
185 | |
186 | if (!tcp_is_ulp_esp(sk)) { |
187 | sock_put(sk); |
188 | return ERR_PTR(error: -EINVAL); |
189 | } |
190 | |
191 | spin_lock_bh(lock: &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(error: -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(lock: &x->lock); |
204 | |
205 | return sk; |
206 | } |
207 | |
208 | static 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(ptr: 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 | |
227 | out: |
228 | rcu_read_unlock(); |
229 | return err; |
230 | } |
231 | |
232 | static 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 | |
241 | static 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(net: xs_net(x), skb, finish: 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 |
256 | static 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 | |
264 | static 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, len: skb->len - offset, csum: 0); |
273 | |
274 | uh->check = csum_ipv6_magic(saddr: &ip6h->saddr, daddr: &ip6h->daddr, |
275 | len, IPPROTO_UDP, sum: csum); |
276 | if (uh->check == 0) |
277 | uh->check = CSUM_MANGLED_0; |
278 | } |
279 | } |
280 | |
281 | static void esp_output_done(void *data, int err) |
282 | { |
283 | struct sk_buff *skb = data; |
284 | struct xfrm_offload *xo = xfrm_offload(skb); |
285 | void *tmp; |
286 | struct xfrm_state *x; |
287 | |
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 { |
293 | x = skb_dst(skb)->xfrm; |
294 | } |
295 | |
296 | tmp = ESP_SKB_CB(skb)->tmp; |
297 | esp_ssg_unref(x, tmp); |
298 | kfree(objp: tmp); |
299 | |
300 | esp_output_encap_csum(skb); |
301 | |
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, len: skb->data - skb_mac_header(skb)); |
310 | secpath_reset(skb); |
311 | xfrm_dev_resume(skb); |
312 | } else { |
313 | if (!err && |
314 | x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) |
315 | esp_output_tail_tcp(x, skb); |
316 | else |
317 | xfrm_output_resume(sk: skb->sk, skb, err); |
318 | } |
319 | } |
320 | |
321 | /* Move ESP header back into place. */ |
322 | static void (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; |
326 | __be32 *seqhi = esp_tmp_extra(tmp); |
327 | |
328 | esph->seq_no = esph->spi; |
329 | esph->spi = *seqhi; |
330 | } |
331 | |
332 | static void (struct sk_buff *skb) |
333 | { |
334 | void *tmp = ESP_SKB_CB(skb)->tmp; |
335 | struct esp_output_extra * = esp_tmp_extra(tmp); |
336 | |
337 | esp_restore_header(skb, offset: skb_transport_offset(skb) + extra->esphoff - |
338 | sizeof(__be32)); |
339 | } |
340 | |
341 | static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb, |
342 | struct xfrm_state *x, |
343 | struct ip_esp_hdr *esph, |
344 | struct esp_output_extra *) |
345 | { |
346 | /* For ESN we move the header forward by 4 bytes to |
347 | * accommodate the high bits. We will move it back after |
348 | * encryption. |
349 | */ |
350 | if ((x->props.flags & XFRM_STATE_ESN)) { |
351 | __u32 seqhi; |
352 | struct xfrm_offload *xo = xfrm_offload(skb); |
353 | |
354 | if (xo) |
355 | seqhi = xo->seq.hi; |
356 | else |
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); |
364 | } |
365 | |
366 | esph->spi = x->id.spi; |
367 | |
368 | return esph; |
369 | } |
370 | |
371 | static void esp_output_done_esn(void *data, int err) |
372 | { |
373 | struct sk_buff *skb = data; |
374 | |
375 | esp_output_restore_header(skb); |
376 | esp_output_done(data, err); |
377 | } |
378 | |
379 | static 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(error: -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 | |
410 | #ifdef CONFIG_INET6_ESPINTCP |
411 | static 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(error: -EMSGSIZE); |
423 | |
424 | rcu_read_lock(); |
425 | sk = esp6_find_tcp_sk(x); |
426 | rcu_read_unlock(); |
427 | |
428 | if (IS_ERR(ptr: sk)) |
429 | return ERR_CAST(ptr: sk); |
430 | |
431 | *lenp = htons(len); |
432 | esph = (struct ip_esp_hdr *)(lenp + 1); |
433 | |
434 | return esph; |
435 | } |
436 | #else |
437 | static 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 | |
445 | static 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(lock: &x->lock); |
454 | sport = encap->encap_sport; |
455 | dport = encap->encap_dport; |
456 | encap_type = encap->encap_type; |
457 | spin_unlock_bh(lock: &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; |
465 | case TCP_ENCAP_ESPINTCP: |
466 | esph = esp6_output_tcp_encap(x, skb, esp); |
467 | break; |
468 | } |
469 | |
470 | if (IS_ERR(ptr: esph)) |
471 | return PTR_ERR(ptr: esph); |
472 | |
473 | esp->esph = esph; |
474 | |
475 | return 0; |
476 | } |
477 | |
478 | int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
479 | { |
480 | u8 *tail; |
481 | int nfrags; |
482 | int esph_offset; |
483 | struct page *page; |
484 | struct sk_buff *trailer; |
485 | int tailen = esp->tailen; |
486 | |
487 | if (x->encap) { |
488 | int err = esp6_output_encap(x, skb, esp); |
489 | |
490 | if (err < 0) |
491 | return err; |
492 | } |
493 | |
494 | if (ALIGN(tailen, L1_CACHE_BYTES) > PAGE_SIZE || |
495 | ALIGN(skb->data_len, L1_CACHE_BYTES) > PAGE_SIZE) |
496 | goto cow; |
497 | |
498 | if (!skb_cloned(skb)) { |
499 | if (tailen <= skb_tailroom(skb)) { |
500 | nfrags = 1; |
501 | trailer = skb; |
502 | tail = skb_tail_pointer(skb: trailer); |
503 | |
504 | goto skip_cow; |
505 | } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS) |
506 | && !skb_has_frag_list(skb)) { |
507 | int allocsize; |
508 | struct sock *sk = skb->sk; |
509 | struct page_frag *pfrag = &x->xfrag; |
510 | |
511 | esp->inplace = false; |
512 | |
513 | allocsize = ALIGN(tailen, L1_CACHE_BYTES); |
514 | |
515 | spin_lock_bh(lock: &x->lock); |
516 | |
517 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { |
518 | spin_unlock_bh(lock: &x->lock); |
519 | goto cow; |
520 | } |
521 | |
522 | page = pfrag->page; |
523 | get_page(page); |
524 | |
525 | tail = page_address(page) + pfrag->offset; |
526 | |
527 | esp_output_fill_trailer(tail, tfclen: esp->tfclen, plen: esp->plen, proto: esp->proto); |
528 | |
529 | nfrags = skb_shinfo(skb)->nr_frags; |
530 | |
531 | __skb_fill_page_desc(skb, i: nfrags, page, off: pfrag->offset, |
532 | size: tailen); |
533 | skb_shinfo(skb)->nr_frags = ++nfrags; |
534 | |
535 | pfrag->offset = pfrag->offset + allocsize; |
536 | |
537 | spin_unlock_bh(lock: &x->lock); |
538 | |
539 | nfrags++; |
540 | |
541 | skb->len += tailen; |
542 | skb->data_len += tailen; |
543 | skb->truesize += tailen; |
544 | if (sk && sk_fullsock(sk)) |
545 | refcount_add(i: tailen, r: &sk->sk_wmem_alloc); |
546 | |
547 | goto out; |
548 | } |
549 | } |
550 | |
551 | cow: |
552 | esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb); |
553 | |
554 | nfrags = skb_cow_data(skb, tailbits: tailen, trailer: &trailer); |
555 | if (nfrags < 0) |
556 | goto out; |
557 | tail = skb_tail_pointer(skb: trailer); |
558 | esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset); |
559 | |
560 | skip_cow: |
561 | esp_output_fill_trailer(tail, tfclen: esp->tfclen, plen: esp->plen, proto: esp->proto); |
562 | pskb_put(skb, tail: trailer, len: tailen); |
563 | |
564 | out: |
565 | return nfrags; |
566 | } |
567 | EXPORT_SYMBOL_GPL(esp6_output_head); |
568 | |
569 | int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) |
570 | { |
571 | u8 *iv; |
572 | int alen; |
573 | void *tmp; |
574 | int ivlen; |
575 | int assoclen; |
576 | int ; |
577 | struct page *page; |
578 | struct ip_esp_hdr *esph; |
579 | struct aead_request *req; |
580 | struct crypto_aead *aead; |
581 | struct scatterlist *sg, *dsg; |
582 | struct esp_output_extra *; |
583 | int err = -ENOMEM; |
584 | |
585 | assoclen = sizeof(struct ip_esp_hdr); |
586 | extralen = 0; |
587 | |
588 | if (x->props.flags & XFRM_STATE_ESN) { |
589 | extralen += sizeof(*extra); |
590 | assoclen += sizeof(__be32); |
591 | } |
592 | |
593 | aead = x->data; |
594 | alen = crypto_aead_authsize(tfm: aead); |
595 | ivlen = crypto_aead_ivsize(tfm: aead); |
596 | |
597 | tmp = esp_alloc_tmp(aead, nfrags: esp->nfrags + 2, seqihlen: extralen); |
598 | if (!tmp) |
599 | goto error; |
600 | |
601 | extra = esp_tmp_extra(tmp); |
602 | iv = esp_tmp_iv(aead, tmp, seqhilen: extralen); |
603 | req = esp_tmp_req(aead, iv); |
604 | sg = esp_req_sg(aead, req); |
605 | |
606 | if (esp->inplace) |
607 | dsg = sg; |
608 | else |
609 | dsg = &sg[esp->nfrags]; |
610 | |
611 | esph = esp_output_set_esn(skb, x, esph: esp->esph, extra); |
612 | esp->esph = esph; |
613 | |
614 | sg_init_table(sg, esp->nfrags); |
615 | err = skb_to_sgvec(skb, sg, |
616 | offset: (unsigned char *)esph - skb->data, |
617 | len: assoclen + ivlen + esp->clen + alen); |
618 | if (unlikely(err < 0)) |
619 | goto error_free; |
620 | |
621 | if (!esp->inplace) { |
622 | int allocsize; |
623 | struct page_frag *pfrag = &x->xfrag; |
624 | |
625 | allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); |
626 | |
627 | spin_lock_bh(lock: &x->lock); |
628 | if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) { |
629 | spin_unlock_bh(lock: &x->lock); |
630 | goto error_free; |
631 | } |
632 | |
633 | skb_shinfo(skb)->nr_frags = 1; |
634 | |
635 | page = pfrag->page; |
636 | get_page(page); |
637 | /* replace page frags in skb with new page */ |
638 | __skb_fill_page_desc(skb, i: 0, page, off: pfrag->offset, size: skb->data_len); |
639 | pfrag->offset = pfrag->offset + allocsize; |
640 | spin_unlock_bh(lock: &x->lock); |
641 | |
642 | sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); |
643 | err = skb_to_sgvec(skb, sg: dsg, |
644 | offset: (unsigned char *)esph - skb->data, |
645 | len: assoclen + ivlen + esp->clen + alen); |
646 | if (unlikely(err < 0)) |
647 | goto error_free; |
648 | } |
649 | |
650 | if ((x->props.flags & XFRM_STATE_ESN)) |
651 | aead_request_set_callback(req, flags: 0, compl: esp_output_done_esn, data: skb); |
652 | else |
653 | aead_request_set_callback(req, flags: 0, compl: esp_output_done, data: skb); |
654 | |
655 | aead_request_set_crypt(req, src: sg, dst: dsg, cryptlen: ivlen + esp->clen, iv); |
656 | aead_request_set_ad(req, assoclen); |
657 | |
658 | memset(iv, 0, ivlen); |
659 | memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8), |
660 | min(ivlen, 8)); |
661 | |
662 | ESP_SKB_CB(skb)->tmp = tmp; |
663 | err = crypto_aead_encrypt(req); |
664 | |
665 | switch (err) { |
666 | case -EINPROGRESS: |
667 | goto error; |
668 | |
669 | case -ENOSPC: |
670 | err = NET_XMIT_DROP; |
671 | break; |
672 | |
673 | case 0: |
674 | if ((x->props.flags & XFRM_STATE_ESN)) |
675 | esp_output_restore_header(skb); |
676 | esp_output_encap_csum(skb); |
677 | } |
678 | |
679 | if (sg != dsg) |
680 | esp_ssg_unref(x, tmp); |
681 | |
682 | if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP) |
683 | err = esp_output_tail_tcp(x, skb); |
684 | |
685 | error_free: |
686 | kfree(objp: tmp); |
687 | error: |
688 | return err; |
689 | } |
690 | EXPORT_SYMBOL_GPL(esp6_output_tail); |
691 | |
692 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
693 | { |
694 | int alen; |
695 | int blksize; |
696 | struct ip_esp_hdr *esph; |
697 | struct crypto_aead *aead; |
698 | struct esp_info esp; |
699 | |
700 | esp.inplace = true; |
701 | |
702 | esp.proto = *skb_mac_header(skb); |
703 | *skb_mac_header(skb) = IPPROTO_ESP; |
704 | |
705 | /* skb is pure payload to encrypt */ |
706 | |
707 | aead = x->data; |
708 | alen = crypto_aead_authsize(tfm: aead); |
709 | |
710 | esp.tfclen = 0; |
711 | if (x->tfcpad) { |
712 | struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb); |
713 | u32 padto; |
714 | |
715 | padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached)); |
716 | if (skb->len < padto) |
717 | esp.tfclen = padto - skb->len; |
718 | } |
719 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
720 | esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); |
721 | esp.plen = esp.clen - skb->len - esp.tfclen; |
722 | esp.tailen = esp.tfclen + esp.plen + alen; |
723 | |
724 | esp.esph = ip_esp_hdr(skb); |
725 | |
726 | esp.nfrags = esp6_output_head(x, skb, &esp); |
727 | if (esp.nfrags < 0) |
728 | return esp.nfrags; |
729 | |
730 | esph = esp.esph; |
731 | esph->spi = x->id.spi; |
732 | |
733 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
734 | esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + |
735 | ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); |
736 | |
737 | skb_push(skb, len: -skb_network_offset(skb)); |
738 | |
739 | return esp6_output_tail(x, skb, &esp); |
740 | } |
741 | |
742 | static inline int esp_remove_trailer(struct sk_buff *skb) |
743 | { |
744 | struct xfrm_state *x = xfrm_input_state(skb); |
745 | struct crypto_aead *aead = x->data; |
746 | int alen, hlen, elen; |
747 | int padlen, trimlen; |
748 | __wsum csumdiff; |
749 | u8 nexthdr[2]; |
750 | int ret; |
751 | |
752 | alen = crypto_aead_authsize(tfm: aead); |
753 | hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(tfm: aead); |
754 | elen = skb->len - hlen; |
755 | |
756 | ret = skb_copy_bits(skb, offset: skb->len - alen - 2, to: nexthdr, len: 2); |
757 | BUG_ON(ret); |
758 | |
759 | ret = -EINVAL; |
760 | padlen = nexthdr[0]; |
761 | if (padlen + 2 + alen >= elen) { |
762 | net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n" , |
763 | padlen + 2, elen - alen); |
764 | goto out; |
765 | } |
766 | |
767 | trimlen = alen + padlen + 2; |
768 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
769 | csumdiff = skb_checksum(skb, offset: skb->len - trimlen, len: trimlen, csum: 0); |
770 | skb->csum = csum_block_sub(csum: skb->csum, csum2: csumdiff, |
771 | offset: skb->len - trimlen); |
772 | } |
773 | ret = pskb_trim(skb, len: skb->len - trimlen); |
774 | if (unlikely(ret)) |
775 | return ret; |
776 | |
777 | ret = nexthdr[1]; |
778 | |
779 | out: |
780 | return ret; |
781 | } |
782 | |
783 | int 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(tfm: aead); |
789 | int hdr_len = skb_network_header_len(skb); |
790 | |
791 | if (!xo || !(xo->flags & CRYPTO_DONE)) |
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 | |
801 | if (x->encap) { |
802 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
803 | int offset = skb_network_offset(skb) + sizeof(*ip6h); |
804 | struct xfrm_encap_tmpl *encap = x->encap; |
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, start: offset, nexthdrp: &nexthdr, frag_offp: &frag_off); |
811 | if (offset == -1) { |
812 | err = -EINVAL; |
813 | goto out; |
814 | } |
815 | |
816 | uh = (void *)(skb->data + offset); |
817 | th = (void *)(skb->data + offset); |
818 | hdr_len += offset; |
819 | |
820 | switch (x->encap->encap_type) { |
821 | case TCP_ENCAP_ESPINTCP: |
822 | source = th->source; |
823 | break; |
824 | case UDP_ENCAP_ESPINUDP: |
825 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
826 | source = uh->source; |
827 | break; |
828 | default: |
829 | WARN_ON_ONCE(1); |
830 | err = -EINVAL; |
831 | goto out; |
832 | } |
833 | |
834 | /* |
835 | * 1) if the NAT-T peer's IP or port changed then |
836 | * advertise the change to the keying daemon. |
837 | * This is an inbound SA, so just compare |
838 | * SRC ports. |
839 | */ |
840 | if (!ipv6_addr_equal(a1: &ip6h->saddr, a2: &x->props.saddr.in6) || |
841 | source != encap->encap_sport) { |
842 | xfrm_address_t ipaddr; |
843 | |
844 | memcpy(&ipaddr.a6, &ip6h->saddr.s6_addr, sizeof(ipaddr.a6)); |
845 | km_new_mapping(x, ipaddr: &ipaddr, sport: source); |
846 | |
847 | /* XXX: perhaps add an extra |
848 | * policy check here, to see |
849 | * if we should allow or |
850 | * reject a packet from a |
851 | * different source |
852 | * address/port. |
853 | */ |
854 | } |
855 | |
856 | /* |
857 | * 2) ignore UDP/TCP checksums in case |
858 | * of NAT-T in Transport Mode, or |
859 | * perform other post-processing fixes |
860 | * as per draft-ietf-ipsec-udp-encaps-06, |
861 | * section 3.1.2 |
862 | */ |
863 | if (x->props.mode == XFRM_MODE_TRANSPORT) |
864 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
865 | } |
866 | |
867 | skb_postpull_rcsum(skb, start: skb_network_header(skb), |
868 | len: skb_network_header_len(skb)); |
869 | skb_pull_rcsum(skb, len: hlen); |
870 | if (x->props.mode == XFRM_MODE_TUNNEL) |
871 | skb_reset_transport_header(skb); |
872 | else |
873 | skb_set_transport_header(skb, offset: -hdr_len); |
874 | |
875 | /* RFC4303: Drop dummy packets without any error */ |
876 | if (err == IPPROTO_NONE) |
877 | err = -EINVAL; |
878 | |
879 | out: |
880 | return err; |
881 | } |
882 | EXPORT_SYMBOL_GPL(esp6_input_done2); |
883 | |
884 | static void esp_input_done(void *data, int err) |
885 | { |
886 | struct sk_buff *skb = data; |
887 | |
888 | xfrm_input_resume(skb, nexthdr: esp6_input_done2(skb, err)); |
889 | } |
890 | |
891 | static void (struct sk_buff *skb) |
892 | { |
893 | esp_restore_header(skb, offset: 0); |
894 | __skb_pull(skb, len: 4); |
895 | } |
896 | |
897 | static void (struct sk_buff *skb, __be32 *seqhi) |
898 | { |
899 | struct xfrm_state *x = xfrm_input_state(skb); |
900 | |
901 | /* For ESN we move the header forward by 4 bytes to |
902 | * accommodate the high bits. We will move it back after |
903 | * decryption. |
904 | */ |
905 | if ((x->props.flags & XFRM_STATE_ESN)) { |
906 | struct ip_esp_hdr *esph = skb_push(skb, len: 4); |
907 | |
908 | *seqhi = esph->spi; |
909 | esph->spi = esph->seq_no; |
910 | esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi; |
911 | } |
912 | } |
913 | |
914 | static void esp_input_done_esn(void *data, int err) |
915 | { |
916 | struct sk_buff *skb = data; |
917 | |
918 | esp_input_restore_header(skb); |
919 | esp_input_done(data, err); |
920 | } |
921 | |
922 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
923 | { |
924 | struct crypto_aead *aead = x->data; |
925 | struct aead_request *req; |
926 | struct sk_buff *trailer; |
927 | int ivlen = crypto_aead_ivsize(tfm: aead); |
928 | int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen; |
929 | int nfrags; |
930 | int assoclen; |
931 | int seqhilen; |
932 | int ret = 0; |
933 | void *tmp; |
934 | __be32 *seqhi; |
935 | u8 *iv; |
936 | struct scatterlist *sg; |
937 | |
938 | if (!pskb_may_pull(skb, len: sizeof(struct ip_esp_hdr) + ivlen)) { |
939 | ret = -EINVAL; |
940 | goto out; |
941 | } |
942 | |
943 | if (elen <= 0) { |
944 | ret = -EINVAL; |
945 | goto out; |
946 | } |
947 | |
948 | assoclen = sizeof(struct ip_esp_hdr); |
949 | seqhilen = 0; |
950 | |
951 | if (x->props.flags & XFRM_STATE_ESN) { |
952 | seqhilen += sizeof(__be32); |
953 | assoclen += seqhilen; |
954 | } |
955 | |
956 | if (!skb_cloned(skb)) { |
957 | if (!skb_is_nonlinear(skb)) { |
958 | nfrags = 1; |
959 | |
960 | goto skip_cow; |
961 | } else if (!skb_has_frag_list(skb)) { |
962 | nfrags = skb_shinfo(skb)->nr_frags; |
963 | nfrags++; |
964 | |
965 | goto skip_cow; |
966 | } |
967 | } |
968 | |
969 | nfrags = skb_cow_data(skb, tailbits: 0, trailer: &trailer); |
970 | if (nfrags < 0) { |
971 | ret = -EINVAL; |
972 | goto out; |
973 | } |
974 | |
975 | skip_cow: |
976 | ret = -ENOMEM; |
977 | tmp = esp_alloc_tmp(aead, nfrags, seqihlen: seqhilen); |
978 | if (!tmp) |
979 | goto out; |
980 | |
981 | ESP_SKB_CB(skb)->tmp = tmp; |
982 | seqhi = esp_tmp_extra(tmp); |
983 | iv = esp_tmp_iv(aead, tmp, seqhilen); |
984 | req = esp_tmp_req(aead, iv); |
985 | sg = esp_req_sg(aead, req); |
986 | |
987 | esp_input_set_header(skb, seqhi); |
988 | |
989 | sg_init_table(sg, nfrags); |
990 | ret = skb_to_sgvec(skb, sg, offset: 0, len: skb->len); |
991 | if (unlikely(ret < 0)) { |
992 | kfree(objp: tmp); |
993 | goto out; |
994 | } |
995 | |
996 | skb->ip_summed = CHECKSUM_NONE; |
997 | |
998 | if ((x->props.flags & XFRM_STATE_ESN)) |
999 | aead_request_set_callback(req, flags: 0, compl: esp_input_done_esn, data: skb); |
1000 | else |
1001 | aead_request_set_callback(req, flags: 0, compl: esp_input_done, data: skb); |
1002 | |
1003 | aead_request_set_crypt(req, src: sg, dst: sg, cryptlen: elen + ivlen, iv); |
1004 | aead_request_set_ad(req, assoclen); |
1005 | |
1006 | ret = crypto_aead_decrypt(req); |
1007 | if (ret == -EINPROGRESS) |
1008 | goto out; |
1009 | |
1010 | if ((x->props.flags & XFRM_STATE_ESN)) |
1011 | esp_input_restore_header(skb); |
1012 | |
1013 | ret = esp6_input_done2(skb, ret); |
1014 | |
1015 | out: |
1016 | return ret; |
1017 | } |
1018 | |
1019 | static int esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
1020 | u8 type, u8 code, int offset, __be32 info) |
1021 | { |
1022 | struct net *net = dev_net(dev: skb->dev); |
1023 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
1024 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1025 | struct xfrm_state *x; |
1026 | |
1027 | if (type != ICMPV6_PKT_TOOBIG && |
1028 | type != NDISC_REDIRECT) |
1029 | return 0; |
1030 | |
1031 | x = xfrm_state_lookup(net, mark: skb->mark, daddr: (const xfrm_address_t *)&iph->daddr, |
1032 | spi: esph->spi, IPPROTO_ESP, AF_INET6); |
1033 | if (!x) |
1034 | return 0; |
1035 | |
1036 | if (type == NDISC_REDIRECT) |
1037 | ip6_redirect(skb, net, oif: skb->dev->ifindex, mark: 0, |
1038 | uid: sock_net_uid(net, NULL)); |
1039 | else |
1040 | ip6_update_pmtu(skb, net, mtu: info, oif: 0, mark: 0, uid: sock_net_uid(net, NULL)); |
1041 | xfrm_state_put(x); |
1042 | |
1043 | return 0; |
1044 | } |
1045 | |
1046 | static void esp6_destroy(struct xfrm_state *x) |
1047 | { |
1048 | struct crypto_aead *aead = x->data; |
1049 | |
1050 | if (!aead) |
1051 | return; |
1052 | |
1053 | crypto_free_aead(tfm: aead); |
1054 | } |
1055 | |
1056 | static int esp_init_aead(struct xfrm_state *x, struct netlink_ext_ack *extack) |
1057 | { |
1058 | char aead_name[CRYPTO_MAX_ALG_NAME]; |
1059 | struct crypto_aead *aead; |
1060 | int err; |
1061 | |
1062 | if (snprintf(buf: aead_name, CRYPTO_MAX_ALG_NAME, fmt: "%s(%s)" , |
1063 | x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) { |
1064 | NL_SET_ERR_MSG(extack, "Algorithm name is too long" ); |
1065 | return -ENAMETOOLONG; |
1066 | } |
1067 | |
1068 | aead = crypto_alloc_aead(alg_name: aead_name, type: 0, mask: 0); |
1069 | err = PTR_ERR(ptr: aead); |
1070 | if (IS_ERR(ptr: aead)) |
1071 | goto error; |
1072 | |
1073 | x->data = aead; |
1074 | |
1075 | err = crypto_aead_setkey(tfm: aead, key: x->aead->alg_key, |
1076 | keylen: (x->aead->alg_key_len + 7) / 8); |
1077 | if (err) |
1078 | goto error; |
1079 | |
1080 | err = crypto_aead_setauthsize(tfm: aead, authsize: x->aead->alg_icv_len / 8); |
1081 | if (err) |
1082 | goto error; |
1083 | |
1084 | return 0; |
1085 | |
1086 | error: |
1087 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations" ); |
1088 | return err; |
1089 | } |
1090 | |
1091 | static int esp_init_authenc(struct xfrm_state *x, |
1092 | struct netlink_ext_ack *extack) |
1093 | { |
1094 | struct crypto_aead *aead; |
1095 | struct crypto_authenc_key_param *param; |
1096 | struct rtattr *rta; |
1097 | char *key; |
1098 | char *p; |
1099 | char authenc_name[CRYPTO_MAX_ALG_NAME]; |
1100 | unsigned int keylen; |
1101 | int err; |
1102 | |
1103 | err = -ENAMETOOLONG; |
1104 | |
1105 | if ((x->props.flags & XFRM_STATE_ESN)) { |
1106 | if (snprintf(buf: authenc_name, CRYPTO_MAX_ALG_NAME, |
1107 | fmt: "%s%sauthencesn(%s,%s)%s" , |
1108 | x->geniv ?: "" , x->geniv ? "(" : "" , |
1109 | x->aalg ? x->aalg->alg_name : "digest_null" , |
1110 | x->ealg->alg_name, |
1111 | x->geniv ? ")" : "" ) >= CRYPTO_MAX_ALG_NAME) { |
1112 | NL_SET_ERR_MSG(extack, "Algorithm name is too long" ); |
1113 | goto error; |
1114 | } |
1115 | } else { |
1116 | if (snprintf(buf: authenc_name, CRYPTO_MAX_ALG_NAME, |
1117 | fmt: "%s%sauthenc(%s,%s)%s" , |
1118 | x->geniv ?: "" , x->geniv ? "(" : "" , |
1119 | x->aalg ? x->aalg->alg_name : "digest_null" , |
1120 | x->ealg->alg_name, |
1121 | x->geniv ? ")" : "" ) >= CRYPTO_MAX_ALG_NAME) { |
1122 | NL_SET_ERR_MSG(extack, "Algorithm name is too long" ); |
1123 | goto error; |
1124 | } |
1125 | } |
1126 | |
1127 | aead = crypto_alloc_aead(alg_name: authenc_name, type: 0, mask: 0); |
1128 | err = PTR_ERR(ptr: aead); |
1129 | if (IS_ERR(ptr: aead)) { |
1130 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations" ); |
1131 | goto error; |
1132 | } |
1133 | |
1134 | x->data = aead; |
1135 | |
1136 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + |
1137 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); |
1138 | err = -ENOMEM; |
1139 | key = kmalloc(size: keylen, GFP_KERNEL); |
1140 | if (!key) |
1141 | goto error; |
1142 | |
1143 | p = key; |
1144 | rta = (void *)p; |
1145 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; |
1146 | rta->rta_len = RTA_LENGTH(sizeof(*param)); |
1147 | param = RTA_DATA(rta); |
1148 | p += RTA_SPACE(sizeof(*param)); |
1149 | |
1150 | if (x->aalg) { |
1151 | struct xfrm_algo_desc *aalg_desc; |
1152 | |
1153 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
1154 | p += (x->aalg->alg_key_len + 7) / 8; |
1155 | |
1156 | aalg_desc = xfrm_aalg_get_byname(name: x->aalg->alg_name, probe: 0); |
1157 | BUG_ON(!aalg_desc); |
1158 | |
1159 | err = -EINVAL; |
1160 | if (aalg_desc->uinfo.auth.icv_fullbits / 8 != |
1161 | crypto_aead_authsize(tfm: aead)) { |
1162 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations" ); |
1163 | goto free_key; |
1164 | } |
1165 | |
1166 | err = crypto_aead_setauthsize( |
1167 | tfm: aead, authsize: x->aalg->alg_trunc_len / 8); |
1168 | if (err) { |
1169 | NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations" ); |
1170 | goto free_key; |
1171 | } |
1172 | } |
1173 | |
1174 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
1175 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); |
1176 | |
1177 | err = crypto_aead_setkey(tfm: aead, key, keylen); |
1178 | |
1179 | free_key: |
1180 | kfree(objp: key); |
1181 | |
1182 | error: |
1183 | return err; |
1184 | } |
1185 | |
1186 | static int esp6_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) |
1187 | { |
1188 | struct crypto_aead *aead; |
1189 | u32 align; |
1190 | int err; |
1191 | |
1192 | x->data = NULL; |
1193 | |
1194 | if (x->aead) { |
1195 | err = esp_init_aead(x, extack); |
1196 | } else if (x->ealg) { |
1197 | err = esp_init_authenc(x, extack); |
1198 | } else { |
1199 | NL_SET_ERR_MSG(extack, "ESP: AEAD or CRYPT must be provided" ); |
1200 | err = -EINVAL; |
1201 | } |
1202 | |
1203 | if (err) |
1204 | goto error; |
1205 | |
1206 | aead = x->data; |
1207 | |
1208 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
1209 | crypto_aead_ivsize(tfm: aead); |
1210 | switch (x->props.mode) { |
1211 | case XFRM_MODE_BEET: |
1212 | if (x->sel.family != AF_INET6) |
1213 | x->props.header_len += IPV4_BEET_PHMAXLEN + |
1214 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
1215 | break; |
1216 | default: |
1217 | case XFRM_MODE_TRANSPORT: |
1218 | break; |
1219 | case XFRM_MODE_TUNNEL: |
1220 | x->props.header_len += sizeof(struct ipv6hdr); |
1221 | break; |
1222 | } |
1223 | |
1224 | if (x->encap) { |
1225 | struct xfrm_encap_tmpl *encap = x->encap; |
1226 | |
1227 | switch (encap->encap_type) { |
1228 | default: |
1229 | NL_SET_ERR_MSG(extack, "Unsupported encapsulation type for ESP" ); |
1230 | err = -EINVAL; |
1231 | goto error; |
1232 | case UDP_ENCAP_ESPINUDP: |
1233 | x->props.header_len += sizeof(struct udphdr); |
1234 | break; |
1235 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
1236 | x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32); |
1237 | break; |
1238 | #ifdef CONFIG_INET6_ESPINTCP |
1239 | case TCP_ENCAP_ESPINTCP: |
1240 | /* only the length field, TCP encap is done by |
1241 | * the socket |
1242 | */ |
1243 | x->props.header_len += 2; |
1244 | break; |
1245 | #endif |
1246 | } |
1247 | } |
1248 | |
1249 | align = ALIGN(crypto_aead_blocksize(aead), 4); |
1250 | x->props.trailer_len = align + 1 + crypto_aead_authsize(tfm: aead); |
1251 | |
1252 | error: |
1253 | return err; |
1254 | } |
1255 | |
1256 | static int esp6_rcv_cb(struct sk_buff *skb, int err) |
1257 | { |
1258 | return 0; |
1259 | } |
1260 | |
1261 | static const struct xfrm_type esp6_type = { |
1262 | .owner = THIS_MODULE, |
1263 | .proto = IPPROTO_ESP, |
1264 | .flags = XFRM_TYPE_REPLAY_PROT, |
1265 | .init_state = esp6_init_state, |
1266 | .destructor = esp6_destroy, |
1267 | .input = esp6_input, |
1268 | .output = esp6_output, |
1269 | }; |
1270 | |
1271 | static struct xfrm6_protocol esp6_protocol = { |
1272 | .handler = xfrm6_rcv, |
1273 | .input_handler = xfrm_input, |
1274 | .cb_handler = esp6_rcv_cb, |
1275 | .err_handler = esp6_err, |
1276 | .priority = 0, |
1277 | }; |
1278 | |
1279 | static int __init esp6_init(void) |
1280 | { |
1281 | if (xfrm_register_type(type: &esp6_type, AF_INET6) < 0) { |
1282 | pr_info("%s: can't add xfrm type\n" , __func__); |
1283 | return -EAGAIN; |
1284 | } |
1285 | if (xfrm6_protocol_register(handler: &esp6_protocol, IPPROTO_ESP) < 0) { |
1286 | pr_info("%s: can't add protocol\n" , __func__); |
1287 | xfrm_unregister_type(type: &esp6_type, AF_INET6); |
1288 | return -EAGAIN; |
1289 | } |
1290 | |
1291 | return 0; |
1292 | } |
1293 | |
1294 | static void __exit esp6_fini(void) |
1295 | { |
1296 | if (xfrm6_protocol_deregister(handler: &esp6_protocol, IPPROTO_ESP) < 0) |
1297 | pr_info("%s: can't remove protocol\n" , __func__); |
1298 | xfrm_unregister_type(type: &esp6_type, AF_INET6); |
1299 | } |
1300 | |
1301 | module_init(esp6_init); |
1302 | module_exit(esp6_fini); |
1303 | |
1304 | MODULE_LICENSE("GPL" ); |
1305 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |
1306 | |