Commit | Line | Data |
---|---|---|
03c8efc1 HX |
1 | /* |
2 | * af_alg: User-space algorithm interface | |
3 | * | |
4 | * This file provides the user-space API for algorithms. | |
5 | * | |
6 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | */ | |
14 | ||
60063497 | 15 | #include <linux/atomic.h> |
03c8efc1 HX |
16 | #include <crypto/if_alg.h> |
17 | #include <linux/crypto.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/net.h> | |
23 | #include <linux/rwsem.h> | |
2d97591e | 24 | #include <linux/sched/signal.h> |
4c63f83c | 25 | #include <linux/security.h> |
03c8efc1 HX |
26 | |
27 | struct alg_type_list { | |
28 | const struct af_alg_type *type; | |
29 | struct list_head list; | |
30 | }; | |
31 | ||
06869524 | 32 | static atomic_long_t alg_memory_allocated; |
03c8efc1 HX |
33 | |
34 | static struct proto alg_proto = { | |
35 | .name = "ALG", | |
36 | .owner = THIS_MODULE, | |
37 | .memory_allocated = &alg_memory_allocated, | |
38 | .obj_size = sizeof(struct alg_sock), | |
39 | }; | |
40 | ||
41 | static LIST_HEAD(alg_types); | |
42 | static DECLARE_RWSEM(alg_types_sem); | |
43 | ||
44 | static const struct af_alg_type *alg_get_type(const char *name) | |
45 | { | |
46 | const struct af_alg_type *type = ERR_PTR(-ENOENT); | |
47 | struct alg_type_list *node; | |
48 | ||
49 | down_read(&alg_types_sem); | |
50 | list_for_each_entry(node, &alg_types, list) { | |
51 | if (strcmp(node->type->name, name)) | |
52 | continue; | |
53 | ||
54 | if (try_module_get(node->type->owner)) | |
55 | type = node->type; | |
56 | break; | |
57 | } | |
58 | up_read(&alg_types_sem); | |
59 | ||
60 | return type; | |
61 | } | |
62 | ||
63 | int af_alg_register_type(const struct af_alg_type *type) | |
64 | { | |
65 | struct alg_type_list *node; | |
66 | int err = -EEXIST; | |
67 | ||
68 | down_write(&alg_types_sem); | |
69 | list_for_each_entry(node, &alg_types, list) { | |
70 | if (!strcmp(node->type->name, type->name)) | |
71 | goto unlock; | |
72 | } | |
73 | ||
74 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
75 | err = -ENOMEM; | |
76 | if (!node) | |
77 | goto unlock; | |
78 | ||
79 | type->ops->owner = THIS_MODULE; | |
37766586 HX |
80 | if (type->ops_nokey) |
81 | type->ops_nokey->owner = THIS_MODULE; | |
03c8efc1 HX |
82 | node->type = type; |
83 | list_add(&node->list, &alg_types); | |
84 | err = 0; | |
85 | ||
86 | unlock: | |
87 | up_write(&alg_types_sem); | |
88 | ||
89 | return err; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(af_alg_register_type); | |
92 | ||
93 | int af_alg_unregister_type(const struct af_alg_type *type) | |
94 | { | |
95 | struct alg_type_list *node; | |
96 | int err = -ENOENT; | |
97 | ||
98 | down_write(&alg_types_sem); | |
99 | list_for_each_entry(node, &alg_types, list) { | |
100 | if (strcmp(node->type->name, type->name)) | |
101 | continue; | |
102 | ||
103 | list_del(&node->list); | |
104 | kfree(node); | |
105 | err = 0; | |
106 | break; | |
107 | } | |
108 | up_write(&alg_types_sem); | |
109 | ||
110 | return err; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(af_alg_unregister_type); | |
113 | ||
114 | static void alg_do_release(const struct af_alg_type *type, void *private) | |
115 | { | |
116 | if (!type) | |
117 | return; | |
118 | ||
119 | type->release(private); | |
120 | module_put(type->owner); | |
121 | } | |
122 | ||
123 | int af_alg_release(struct socket *sock) | |
124 | { | |
125 | if (sock->sk) | |
126 | sock_put(sock->sk); | |
127 | return 0; | |
128 | } | |
129 | EXPORT_SYMBOL_GPL(af_alg_release); | |
130 | ||
c840ac6a HX |
131 | void af_alg_release_parent(struct sock *sk) |
132 | { | |
133 | struct alg_sock *ask = alg_sk(sk); | |
a6a48c56 HX |
134 | unsigned int nokey = ask->nokey_refcnt; |
135 | bool last = nokey && !ask->refcnt; | |
c840ac6a HX |
136 | |
137 | sk = ask->parent; | |
138 | ask = alg_sk(sk); | |
139 | ||
140 | lock_sock(sk); | |
a6a48c56 HX |
141 | ask->nokey_refcnt -= nokey; |
142 | if (!last) | |
143 | last = !--ask->refcnt; | |
c840ac6a HX |
144 | release_sock(sk); |
145 | ||
146 | if (last) | |
147 | sock_put(sk); | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(af_alg_release_parent); | |
150 | ||
03c8efc1 HX |
151 | static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
152 | { | |
bb30b884 | 153 | const u32 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY; |
03c8efc1 HX |
154 | struct sock *sk = sock->sk; |
155 | struct alg_sock *ask = alg_sk(sk); | |
156 | struct sockaddr_alg *sa = (void *)uaddr; | |
157 | const struct af_alg_type *type; | |
158 | void *private; | |
c840ac6a | 159 | int err; |
03c8efc1 HX |
160 | |
161 | if (sock->state == SS_CONNECTED) | |
162 | return -EINVAL; | |
163 | ||
3f69cc60 | 164 | if (addr_len < sizeof(*sa)) |
03c8efc1 HX |
165 | return -EINVAL; |
166 | ||
a466856e ED |
167 | /* If caller uses non-allowed flag, return error. */ |
168 | if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed)) | |
169 | return -EINVAL; | |
170 | ||
03c8efc1 | 171 | sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
3f69cc60 | 172 | sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0; |
03c8efc1 HX |
173 | |
174 | type = alg_get_type(sa->salg_type); | |
175 | if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) { | |
176 | request_module("algif-%s", sa->salg_type); | |
177 | type = alg_get_type(sa->salg_type); | |
178 | } | |
179 | ||
180 | if (IS_ERR(type)) | |
181 | return PTR_ERR(type); | |
182 | ||
bb30b884 | 183 | private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
03c8efc1 HX |
184 | if (IS_ERR(private)) { |
185 | module_put(type->owner); | |
186 | return PTR_ERR(private); | |
187 | } | |
188 | ||
c840ac6a | 189 | err = -EBUSY; |
03c8efc1 | 190 | lock_sock(sk); |
a6a48c56 | 191 | if (ask->refcnt | ask->nokey_refcnt) |
c840ac6a | 192 | goto unlock; |
03c8efc1 HX |
193 | |
194 | swap(ask->type, type); | |
195 | swap(ask->private, private); | |
196 | ||
c840ac6a HX |
197 | err = 0; |
198 | ||
199 | unlock: | |
03c8efc1 HX |
200 | release_sock(sk); |
201 | ||
202 | alg_do_release(type, private); | |
203 | ||
c840ac6a | 204 | return err; |
03c8efc1 HX |
205 | } |
206 | ||
207 | static int alg_setkey(struct sock *sk, char __user *ukey, | |
208 | unsigned int keylen) | |
209 | { | |
210 | struct alg_sock *ask = alg_sk(sk); | |
211 | const struct af_alg_type *type = ask->type; | |
212 | u8 *key; | |
213 | int err; | |
214 | ||
215 | key = sock_kmalloc(sk, keylen, GFP_KERNEL); | |
216 | if (!key) | |
217 | return -ENOMEM; | |
218 | ||
219 | err = -EFAULT; | |
220 | if (copy_from_user(key, ukey, keylen)) | |
221 | goto out; | |
222 | ||
223 | err = type->setkey(ask->private, key, keylen); | |
224 | ||
225 | out: | |
ad202c8c | 226 | sock_kzfree_s(sk, key, keylen); |
03c8efc1 HX |
227 | |
228 | return err; | |
229 | } | |
230 | ||
231 | static int alg_setsockopt(struct socket *sock, int level, int optname, | |
232 | char __user *optval, unsigned int optlen) | |
233 | { | |
234 | struct sock *sk = sock->sk; | |
235 | struct alg_sock *ask = alg_sk(sk); | |
236 | const struct af_alg_type *type; | |
c840ac6a | 237 | int err = -EBUSY; |
03c8efc1 HX |
238 | |
239 | lock_sock(sk); | |
c840ac6a HX |
240 | if (ask->refcnt) |
241 | goto unlock; | |
242 | ||
03c8efc1 HX |
243 | type = ask->type; |
244 | ||
c840ac6a | 245 | err = -ENOPROTOOPT; |
03c8efc1 HX |
246 | if (level != SOL_ALG || !type) |
247 | goto unlock; | |
248 | ||
249 | switch (optname) { | |
250 | case ALG_SET_KEY: | |
251 | if (sock->state == SS_CONNECTED) | |
252 | goto unlock; | |
253 | if (!type->setkey) | |
254 | goto unlock; | |
255 | ||
256 | err = alg_setkey(sk, optval, optlen); | |
25fb8638 SM |
257 | break; |
258 | case ALG_SET_AEAD_AUTHSIZE: | |
259 | if (sock->state == SS_CONNECTED) | |
260 | goto unlock; | |
261 | if (!type->setauthsize) | |
262 | goto unlock; | |
263 | err = type->setauthsize(ask->private, optlen); | |
03c8efc1 HX |
264 | } |
265 | ||
266 | unlock: | |
267 | release_sock(sk); | |
268 | ||
269 | return err; | |
270 | } | |
271 | ||
cdfbabfb | 272 | int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern) |
03c8efc1 HX |
273 | { |
274 | struct alg_sock *ask = alg_sk(sk); | |
275 | const struct af_alg_type *type; | |
276 | struct sock *sk2; | |
6a935170 | 277 | unsigned int nokey; |
03c8efc1 HX |
278 | int err; |
279 | ||
280 | lock_sock(sk); | |
281 | type = ask->type; | |
282 | ||
283 | err = -EINVAL; | |
284 | if (!type) | |
285 | goto unlock; | |
286 | ||
cdfbabfb | 287 | sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
288 | err = -ENOMEM; |
289 | if (!sk2) | |
290 | goto unlock; | |
291 | ||
292 | sock_init_data(newsock, sk2); | |
2acce6aa | 293 | security_sock_graft(sk2, newsock); |
4c63f83c | 294 | security_sk_clone(sk, sk2); |
03c8efc1 HX |
295 | |
296 | err = type->accept(ask->private, sk2); | |
37766586 HX |
297 | |
298 | nokey = err == -ENOKEY; | |
299 | if (nokey && type->accept_nokey) | |
300 | err = type->accept_nokey(ask->private, sk2); | |
301 | ||
a383292c | 302 | if (err) |
03c8efc1 | 303 | goto unlock; |
03c8efc1 | 304 | |
37766586 | 305 | if (nokey || !ask->refcnt++) |
c840ac6a | 306 | sock_hold(sk); |
a6a48c56 | 307 | ask->nokey_refcnt += nokey; |
03c8efc1 HX |
308 | alg_sk(sk2)->parent = sk; |
309 | alg_sk(sk2)->type = type; | |
6a935170 | 310 | alg_sk(sk2)->nokey_refcnt = nokey; |
03c8efc1 HX |
311 | |
312 | newsock->ops = type->ops; | |
313 | newsock->state = SS_CONNECTED; | |
314 | ||
37766586 HX |
315 | if (nokey) |
316 | newsock->ops = type->ops_nokey; | |
317 | ||
03c8efc1 HX |
318 | err = 0; |
319 | ||
320 | unlock: | |
321 | release_sock(sk); | |
322 | ||
323 | return err; | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(af_alg_accept); | |
326 | ||
cdfbabfb DH |
327 | static int alg_accept(struct socket *sock, struct socket *newsock, int flags, |
328 | bool kern) | |
03c8efc1 | 329 | { |
cdfbabfb | 330 | return af_alg_accept(sock->sk, newsock, kern); |
03c8efc1 HX |
331 | } |
332 | ||
333 | static const struct proto_ops alg_proto_ops = { | |
334 | .family = PF_ALG, | |
335 | .owner = THIS_MODULE, | |
336 | ||
337 | .connect = sock_no_connect, | |
338 | .socketpair = sock_no_socketpair, | |
339 | .getname = sock_no_getname, | |
340 | .ioctl = sock_no_ioctl, | |
341 | .listen = sock_no_listen, | |
342 | .shutdown = sock_no_shutdown, | |
343 | .getsockopt = sock_no_getsockopt, | |
344 | .mmap = sock_no_mmap, | |
345 | .sendpage = sock_no_sendpage, | |
346 | .sendmsg = sock_no_sendmsg, | |
347 | .recvmsg = sock_no_recvmsg, | |
03c8efc1 HX |
348 | |
349 | .bind = alg_bind, | |
350 | .release = af_alg_release, | |
351 | .setsockopt = alg_setsockopt, | |
352 | .accept = alg_accept, | |
353 | }; | |
354 | ||
355 | static void alg_sock_destruct(struct sock *sk) | |
356 | { | |
357 | struct alg_sock *ask = alg_sk(sk); | |
358 | ||
359 | alg_do_release(ask->type, ask->private); | |
360 | } | |
361 | ||
362 | static int alg_create(struct net *net, struct socket *sock, int protocol, | |
363 | int kern) | |
364 | { | |
365 | struct sock *sk; | |
366 | int err; | |
367 | ||
368 | if (sock->type != SOCK_SEQPACKET) | |
369 | return -ESOCKTNOSUPPORT; | |
370 | if (protocol != 0) | |
371 | return -EPROTONOSUPPORT; | |
372 | ||
373 | err = -ENOMEM; | |
11aa9c28 | 374 | sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
375 | if (!sk) |
376 | goto out; | |
377 | ||
378 | sock->ops = &alg_proto_ops; | |
379 | sock_init_data(sock, sk); | |
380 | ||
03c8efc1 HX |
381 | sk->sk_destruct = alg_sock_destruct; |
382 | ||
383 | return 0; | |
384 | out: | |
385 | return err; | |
386 | } | |
387 | ||
388 | static const struct net_proto_family alg_family = { | |
389 | .family = PF_ALG, | |
390 | .create = alg_create, | |
391 | .owner = THIS_MODULE, | |
392 | }; | |
393 | ||
1d10eb2f | 394 | int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) |
03c8efc1 | 395 | { |
1d10eb2f AV |
396 | size_t off; |
397 | ssize_t n; | |
398 | int npages, i; | |
03c8efc1 | 399 | |
1d10eb2f AV |
400 | n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off); |
401 | if (n < 0) | |
402 | return n; | |
03c8efc1 | 403 | |
9399f0c5 | 404 | npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
03c8efc1 | 405 | if (WARN_ON(npages == 0)) |
1d10eb2f | 406 | return -EINVAL; |
66db3739 TS |
407 | /* Add one extra for linking */ |
408 | sg_init_table(sgl->sg, npages + 1); | |
03c8efc1 | 409 | |
1d10eb2f | 410 | for (i = 0, len = n; i < npages; i++) { |
03c8efc1 HX |
411 | int plen = min_t(int, len, PAGE_SIZE - off); |
412 | ||
413 | sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); | |
414 | ||
415 | off = 0; | |
416 | len -= plen; | |
03c8efc1 | 417 | } |
66db3739 TS |
418 | sg_mark_end(sgl->sg + npages - 1); |
419 | sgl->npages = npages; | |
420 | ||
1d10eb2f | 421 | return n; |
03c8efc1 HX |
422 | } |
423 | EXPORT_SYMBOL_GPL(af_alg_make_sg); | |
424 | ||
466e0759 EB |
425 | static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, |
426 | struct af_alg_sgl *sgl_new) | |
66db3739 TS |
427 | { |
428 | sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); | |
429 | sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg); | |
430 | } | |
66db3739 | 431 | |
03c8efc1 HX |
432 | void af_alg_free_sg(struct af_alg_sgl *sgl) |
433 | { | |
434 | int i; | |
435 | ||
66db3739 | 436 | for (i = 0; i < sgl->npages; i++) |
03c8efc1 | 437 | put_page(sgl->pages[i]); |
03c8efc1 HX |
438 | } |
439 | EXPORT_SYMBOL_GPL(af_alg_free_sg); | |
440 | ||
466e0759 | 441 | static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con) |
03c8efc1 HX |
442 | { |
443 | struct cmsghdr *cmsg; | |
444 | ||
f95b414e | 445 | for_each_cmsghdr(cmsg, msg) { |
03c8efc1 HX |
446 | if (!CMSG_OK(msg, cmsg)) |
447 | return -EINVAL; | |
448 | if (cmsg->cmsg_level != SOL_ALG) | |
449 | continue; | |
450 | ||
267c4221 | 451 | switch (cmsg->cmsg_type) { |
03c8efc1 HX |
452 | case ALG_SET_IV: |
453 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv))) | |
454 | return -EINVAL; | |
455 | con->iv = (void *)CMSG_DATA(cmsg); | |
456 | if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen + | |
457 | sizeof(*con->iv))) | |
458 | return -EINVAL; | |
459 | break; | |
460 | ||
461 | case ALG_SET_OP: | |
462 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
463 | return -EINVAL; | |
464 | con->op = *(u32 *)CMSG_DATA(cmsg); | |
465 | break; | |
466 | ||
af8e8073 SM |
467 | case ALG_SET_AEAD_ASSOCLEN: |
468 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
469 | return -EINVAL; | |
470 | con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg); | |
471 | break; | |
472 | ||
03c8efc1 HX |
473 | default: |
474 | return -EINVAL; | |
475 | } | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
03c8efc1 | 480 | |
2d97591e SM |
481 | /** |
482 | * af_alg_alloc_tsgl - allocate the TX SGL | |
483 | * | |
484 | * @sk socket of connection to user space | |
485 | * @return: 0 upon success, < 0 upon error | |
486 | */ | |
466e0759 | 487 | static int af_alg_alloc_tsgl(struct sock *sk) |
2d97591e SM |
488 | { |
489 | struct alg_sock *ask = alg_sk(sk); | |
490 | struct af_alg_ctx *ctx = ask->private; | |
491 | struct af_alg_tsgl *sgl; | |
492 | struct scatterlist *sg = NULL; | |
493 | ||
494 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
495 | if (!list_empty(&ctx->tsgl_list)) | |
496 | sg = sgl->sg; | |
497 | ||
498 | if (!sg || sgl->cur >= MAX_SGL_ENTS) { | |
0ed2dd03 KC |
499 | sgl = sock_kmalloc(sk, |
500 | struct_size(sgl, sg, (MAX_SGL_ENTS + 1)), | |
2d97591e SM |
501 | GFP_KERNEL); |
502 | if (!sgl) | |
503 | return -ENOMEM; | |
504 | ||
505 | sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); | |
506 | sgl->cur = 0; | |
507 | ||
508 | if (sg) | |
509 | sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); | |
510 | ||
511 | list_add_tail(&sgl->list, &ctx->tsgl_list); | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
2d97591e SM |
516 | |
517 | /** | |
518 | * aead_count_tsgl - Count number of TX SG entries | |
519 | * | |
520 | * The counting starts from the beginning of the SGL to @bytes. If | |
521 | * an offset is provided, the counting of the SG entries starts at the offset. | |
522 | * | |
523 | * @sk socket of connection to user space | |
524 | * @bytes Count the number of SG entries holding given number of bytes. | |
525 | * @offset Start the counting of SG entries from the given offset. | |
526 | * @return Number of TX SG entries found given the constraints | |
527 | */ | |
528 | unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset) | |
529 | { | |
7c39edfb EB |
530 | const struct alg_sock *ask = alg_sk(sk); |
531 | const struct af_alg_ctx *ctx = ask->private; | |
532 | const struct af_alg_tsgl *sgl; | |
2d97591e SM |
533 | unsigned int i; |
534 | unsigned int sgl_count = 0; | |
535 | ||
536 | if (!bytes) | |
537 | return 0; | |
538 | ||
7c39edfb EB |
539 | list_for_each_entry(sgl, &ctx->tsgl_list, list) { |
540 | const struct scatterlist *sg = sgl->sg; | |
2d97591e SM |
541 | |
542 | for (i = 0; i < sgl->cur; i++) { | |
543 | size_t bytes_count; | |
544 | ||
545 | /* Skip offset */ | |
546 | if (offset >= sg[i].length) { | |
547 | offset -= sg[i].length; | |
548 | bytes -= sg[i].length; | |
549 | continue; | |
550 | } | |
551 | ||
552 | bytes_count = sg[i].length - offset; | |
553 | ||
554 | offset = 0; | |
555 | sgl_count++; | |
556 | ||
557 | /* If we have seen requested number of bytes, stop */ | |
558 | if (bytes_count >= bytes) | |
559 | return sgl_count; | |
560 | ||
561 | bytes -= bytes_count; | |
562 | } | |
563 | } | |
564 | ||
565 | return sgl_count; | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(af_alg_count_tsgl); | |
568 | ||
569 | /** | |
570 | * aead_pull_tsgl - Release the specified buffers from TX SGL | |
571 | * | |
572 | * If @dst is non-null, reassign the pages to dst. The caller must release | |
573 | * the pages. If @dst_offset is given only reassign the pages to @dst starting | |
574 | * at the @dst_offset (byte). The caller must ensure that @dst is large | |
575 | * enough (e.g. by using af_alg_count_tsgl with the same offset). | |
576 | * | |
577 | * @sk socket of connection to user space | |
578 | * @used Number of bytes to pull from TX SGL | |
579 | * @dst If non-NULL, buffer is reassigned to dst SGL instead of releasing. The | |
580 | * caller must release the buffers in dst. | |
581 | * @dst_offset Reassign the TX SGL from given offset. All buffers before | |
582 | * reaching the offset is released. | |
583 | */ | |
584 | void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, | |
585 | size_t dst_offset) | |
586 | { | |
587 | struct alg_sock *ask = alg_sk(sk); | |
588 | struct af_alg_ctx *ctx = ask->private; | |
589 | struct af_alg_tsgl *sgl; | |
590 | struct scatterlist *sg; | |
e117765a | 591 | unsigned int i, j = 0; |
2d97591e SM |
592 | |
593 | while (!list_empty(&ctx->tsgl_list)) { | |
594 | sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, | |
595 | list); | |
596 | sg = sgl->sg; | |
597 | ||
e117765a | 598 | for (i = 0; i < sgl->cur; i++) { |
2d97591e SM |
599 | size_t plen = min_t(size_t, used, sg[i].length); |
600 | struct page *page = sg_page(sg + i); | |
601 | ||
602 | if (!page) | |
603 | continue; | |
604 | ||
605 | /* | |
606 | * Assumption: caller created af_alg_count_tsgl(len) | |
607 | * SG entries in dst. | |
608 | */ | |
609 | if (dst) { | |
610 | if (dst_offset >= plen) { | |
611 | /* discard page before offset */ | |
612 | dst_offset -= plen; | |
2d97591e SM |
613 | } else { |
614 | /* reassign page to dst after offset */ | |
2d45a7e8 | 615 | get_page(page); |
2d97591e SM |
616 | sg_set_page(dst + j, page, |
617 | plen - dst_offset, | |
618 | sg[i].offset + dst_offset); | |
619 | dst_offset = 0; | |
620 | j++; | |
621 | } | |
622 | } | |
623 | ||
624 | sg[i].length -= plen; | |
625 | sg[i].offset += plen; | |
626 | ||
627 | used -= plen; | |
628 | ctx->used -= plen; | |
629 | ||
630 | if (sg[i].length) | |
631 | return; | |
632 | ||
2d45a7e8 | 633 | put_page(page); |
2d97591e SM |
634 | sg_assign_page(sg + i, NULL); |
635 | } | |
636 | ||
637 | list_del(&sgl->list); | |
638 | sock_kfree_s(sk, sgl, sizeof(*sgl) + sizeof(sgl->sg[0]) * | |
639 | (MAX_SGL_ENTS + 1)); | |
640 | } | |
641 | ||
642 | if (!ctx->used) | |
643 | ctx->merge = 0; | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); | |
646 | ||
647 | /** | |
648 | * af_alg_free_areq_sgls - Release TX and RX SGLs of the request | |
649 | * | |
650 | * @areq Request holding the TX and RX SGL | |
651 | */ | |
466e0759 | 652 | static void af_alg_free_areq_sgls(struct af_alg_async_req *areq) |
2d97591e SM |
653 | { |
654 | struct sock *sk = areq->sk; | |
655 | struct alg_sock *ask = alg_sk(sk); | |
656 | struct af_alg_ctx *ctx = ask->private; | |
657 | struct af_alg_rsgl *rsgl, *tmp; | |
658 | struct scatterlist *tsgl; | |
659 | struct scatterlist *sg; | |
660 | unsigned int i; | |
661 | ||
662 | list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) { | |
af955bf1 | 663 | atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused); |
2d97591e SM |
664 | af_alg_free_sg(&rsgl->sgl); |
665 | list_del(&rsgl->list); | |
666 | if (rsgl != &areq->first_rsgl) | |
667 | sock_kfree_s(sk, rsgl, sizeof(*rsgl)); | |
668 | } | |
669 | ||
670 | tsgl = areq->tsgl; | |
887207ed EB |
671 | if (tsgl) { |
672 | for_each_sg(tsgl, sg, areq->tsgl_entries, i) { | |
673 | if (!sg_page(sg)) | |
674 | continue; | |
675 | put_page(sg_page(sg)); | |
676 | } | |
2d97591e | 677 | |
2d97591e | 678 | sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl)); |
887207ed | 679 | } |
2d97591e | 680 | } |
2d97591e SM |
681 | |
682 | /** | |
683 | * af_alg_wait_for_wmem - wait for availability of writable memory | |
684 | * | |
685 | * @sk socket of connection to user space | |
686 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
687 | * @return 0 when writable memory is available, < 0 upon error | |
688 | */ | |
466e0759 | 689 | static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags) |
2d97591e SM |
690 | { |
691 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
692 | int err = -ERESTARTSYS; | |
693 | long timeout; | |
694 | ||
695 | if (flags & MSG_DONTWAIT) | |
696 | return -EAGAIN; | |
697 | ||
698 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
699 | ||
700 | add_wait_queue(sk_sleep(sk), &wait); | |
701 | for (;;) { | |
702 | if (signal_pending(current)) | |
703 | break; | |
704 | timeout = MAX_SCHEDULE_TIMEOUT; | |
705 | if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) { | |
706 | err = 0; | |
707 | break; | |
708 | } | |
709 | } | |
710 | remove_wait_queue(sk_sleep(sk), &wait); | |
711 | ||
712 | return err; | |
713 | } | |
2d97591e SM |
714 | |
715 | /** | |
716 | * af_alg_wmem_wakeup - wakeup caller when writable memory is available | |
717 | * | |
718 | * @sk socket of connection to user space | |
719 | */ | |
720 | void af_alg_wmem_wakeup(struct sock *sk) | |
721 | { | |
722 | struct socket_wq *wq; | |
723 | ||
724 | if (!af_alg_writable(sk)) | |
725 | return; | |
726 | ||
727 | rcu_read_lock(); | |
728 | wq = rcu_dereference(sk->sk_wq); | |
729 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
730 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | |
731 | EPOLLRDNORM | | |
732 | EPOLLRDBAND); | |
2d97591e SM |
733 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
734 | rcu_read_unlock(); | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); | |
737 | ||
738 | /** | |
739 | * af_alg_wait_for_data - wait for availability of TX data | |
740 | * | |
741 | * @sk socket of connection to user space | |
742 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
743 | * @return 0 when writable memory is available, < 0 upon error | |
744 | */ | |
745 | int af_alg_wait_for_data(struct sock *sk, unsigned flags) | |
746 | { | |
747 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
748 | struct alg_sock *ask = alg_sk(sk); | |
749 | struct af_alg_ctx *ctx = ask->private; | |
750 | long timeout; | |
751 | int err = -ERESTARTSYS; | |
752 | ||
753 | if (flags & MSG_DONTWAIT) | |
754 | return -EAGAIN; | |
755 | ||
756 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
757 | ||
758 | add_wait_queue(sk_sleep(sk), &wait); | |
759 | for (;;) { | |
760 | if (signal_pending(current)) | |
761 | break; | |
762 | timeout = MAX_SCHEDULE_TIMEOUT; | |
763 | if (sk_wait_event(sk, &timeout, (ctx->used || !ctx->more), | |
764 | &wait)) { | |
765 | err = 0; | |
766 | break; | |
767 | } | |
768 | } | |
769 | remove_wait_queue(sk_sleep(sk), &wait); | |
770 | ||
771 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
772 | ||
773 | return err; | |
774 | } | |
775 | EXPORT_SYMBOL_GPL(af_alg_wait_for_data); | |
776 | ||
777 | /** | |
778 | * af_alg_data_wakeup - wakeup caller when new data can be sent to kernel | |
779 | * | |
780 | * @sk socket of connection to user space | |
781 | */ | |
466e0759 | 782 | static void af_alg_data_wakeup(struct sock *sk) |
2d97591e SM |
783 | { |
784 | struct alg_sock *ask = alg_sk(sk); | |
785 | struct af_alg_ctx *ctx = ask->private; | |
786 | struct socket_wq *wq; | |
787 | ||
788 | if (!ctx->used) | |
789 | return; | |
790 | ||
791 | rcu_read_lock(); | |
792 | wq = rcu_dereference(sk->sk_wq); | |
793 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
794 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
795 | EPOLLRDNORM | | |
796 | EPOLLRDBAND); | |
2d97591e SM |
797 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
798 | rcu_read_unlock(); | |
799 | } | |
2d97591e SM |
800 | |
801 | /** | |
802 | * af_alg_sendmsg - implementation of sendmsg system call handler | |
803 | * | |
804 | * The sendmsg system call handler obtains the user data and stores it | |
805 | * in ctx->tsgl_list. This implies allocation of the required numbers of | |
806 | * struct af_alg_tsgl. | |
807 | * | |
808 | * In addition, the ctx is filled with the information sent via CMSG. | |
809 | * | |
810 | * @sock socket of connection to user space | |
811 | * @msg message from user space | |
812 | * @size size of message from user space | |
813 | * @ivsize the size of the IV for the cipher operation to verify that the | |
814 | * user-space-provided IV has the right size | |
815 | * @return the number of copied data upon success, < 0 upon error | |
816 | */ | |
817 | int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
818 | unsigned int ivsize) | |
819 | { | |
820 | struct sock *sk = sock->sk; | |
821 | struct alg_sock *ask = alg_sk(sk); | |
822 | struct af_alg_ctx *ctx = ask->private; | |
823 | struct af_alg_tsgl *sgl; | |
824 | struct af_alg_control con = {}; | |
825 | long copied = 0; | |
826 | bool enc = 0; | |
827 | bool init = 0; | |
828 | int err = 0; | |
829 | ||
830 | if (msg->msg_controllen) { | |
831 | err = af_alg_cmsg_send(msg, &con); | |
832 | if (err) | |
833 | return err; | |
834 | ||
835 | init = 1; | |
836 | switch (con.op) { | |
837 | case ALG_OP_ENCRYPT: | |
838 | enc = 1; | |
839 | break; | |
840 | case ALG_OP_DECRYPT: | |
841 | enc = 0; | |
842 | break; | |
843 | default: | |
844 | return -EINVAL; | |
845 | } | |
846 | ||
847 | if (con.iv && con.iv->ivlen != ivsize) | |
848 | return -EINVAL; | |
849 | } | |
850 | ||
851 | lock_sock(sk); | |
852 | if (!ctx->more && ctx->used) { | |
853 | err = -EINVAL; | |
854 | goto unlock; | |
855 | } | |
856 | ||
857 | if (init) { | |
858 | ctx->enc = enc; | |
859 | if (con.iv) | |
860 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
861 | ||
862 | ctx->aead_assoclen = con.aead_assoclen; | |
863 | } | |
864 | ||
865 | while (size) { | |
866 | struct scatterlist *sg; | |
867 | size_t len = size; | |
868 | size_t plen; | |
869 | ||
870 | /* use the existing memory in an allocated page */ | |
871 | if (ctx->merge) { | |
872 | sgl = list_entry(ctx->tsgl_list.prev, | |
873 | struct af_alg_tsgl, list); | |
874 | sg = sgl->sg + sgl->cur - 1; | |
875 | len = min_t(size_t, len, | |
876 | PAGE_SIZE - sg->offset - sg->length); | |
877 | ||
878 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
879 | sg->offset + sg->length, | |
880 | msg, len); | |
881 | if (err) | |
882 | goto unlock; | |
883 | ||
884 | sg->length += len; | |
885 | ctx->merge = (sg->offset + sg->length) & | |
886 | (PAGE_SIZE - 1); | |
887 | ||
888 | ctx->used += len; | |
889 | copied += len; | |
890 | size -= len; | |
891 | continue; | |
892 | } | |
893 | ||
894 | if (!af_alg_writable(sk)) { | |
895 | err = af_alg_wait_for_wmem(sk, msg->msg_flags); | |
896 | if (err) | |
897 | goto unlock; | |
898 | } | |
899 | ||
900 | /* allocate a new page */ | |
901 | len = min_t(unsigned long, len, af_alg_sndbuf(sk)); | |
902 | ||
903 | err = af_alg_alloc_tsgl(sk); | |
904 | if (err) | |
905 | goto unlock; | |
906 | ||
907 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, | |
908 | list); | |
909 | sg = sgl->sg; | |
910 | if (sgl->cur) | |
911 | sg_unmark_end(sg + sgl->cur - 1); | |
912 | ||
913 | do { | |
914 | unsigned int i = sgl->cur; | |
915 | ||
916 | plen = min_t(size_t, len, PAGE_SIZE); | |
917 | ||
918 | sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); | |
919 | if (!sg_page(sg + i)) { | |
920 | err = -ENOMEM; | |
921 | goto unlock; | |
922 | } | |
923 | ||
924 | err = memcpy_from_msg(page_address(sg_page(sg + i)), | |
925 | msg, plen); | |
926 | if (err) { | |
927 | __free_page(sg_page(sg + i)); | |
928 | sg_assign_page(sg + i, NULL); | |
929 | goto unlock; | |
930 | } | |
931 | ||
932 | sg[i].length = plen; | |
933 | len -= plen; | |
934 | ctx->used += plen; | |
935 | copied += plen; | |
936 | size -= plen; | |
937 | sgl->cur++; | |
938 | } while (len && sgl->cur < MAX_SGL_ENTS); | |
939 | ||
940 | if (!size) | |
941 | sg_mark_end(sg + sgl->cur - 1); | |
942 | ||
943 | ctx->merge = plen & (PAGE_SIZE - 1); | |
944 | } | |
945 | ||
946 | err = 0; | |
947 | ||
948 | ctx->more = msg->msg_flags & MSG_MORE; | |
949 | ||
950 | unlock: | |
951 | af_alg_data_wakeup(sk); | |
952 | release_sock(sk); | |
953 | ||
954 | return copied ?: err; | |
955 | } | |
956 | EXPORT_SYMBOL_GPL(af_alg_sendmsg); | |
957 | ||
958 | /** | |
959 | * af_alg_sendpage - sendpage system call handler | |
960 | * | |
961 | * This is a generic implementation of sendpage to fill ctx->tsgl_list. | |
962 | */ | |
963 | ssize_t af_alg_sendpage(struct socket *sock, struct page *page, | |
964 | int offset, size_t size, int flags) | |
965 | { | |
966 | struct sock *sk = sock->sk; | |
967 | struct alg_sock *ask = alg_sk(sk); | |
968 | struct af_alg_ctx *ctx = ask->private; | |
969 | struct af_alg_tsgl *sgl; | |
970 | int err = -EINVAL; | |
971 | ||
972 | if (flags & MSG_SENDPAGE_NOTLAST) | |
973 | flags |= MSG_MORE; | |
974 | ||
975 | lock_sock(sk); | |
976 | if (!ctx->more && ctx->used) | |
977 | goto unlock; | |
978 | ||
979 | if (!size) | |
980 | goto done; | |
981 | ||
982 | if (!af_alg_writable(sk)) { | |
983 | err = af_alg_wait_for_wmem(sk, flags); | |
984 | if (err) | |
985 | goto unlock; | |
986 | } | |
987 | ||
988 | err = af_alg_alloc_tsgl(sk); | |
989 | if (err) | |
990 | goto unlock; | |
991 | ||
992 | ctx->merge = 0; | |
993 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
994 | ||
995 | if (sgl->cur) | |
996 | sg_unmark_end(sgl->sg + sgl->cur - 1); | |
997 | ||
998 | sg_mark_end(sgl->sg + sgl->cur); | |
999 | ||
1000 | get_page(page); | |
1001 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
1002 | sgl->cur++; | |
1003 | ctx->used += size; | |
1004 | ||
1005 | done: | |
1006 | ctx->more = flags & MSG_MORE; | |
1007 | ||
1008 | unlock: | |
1009 | af_alg_data_wakeup(sk); | |
1010 | release_sock(sk); | |
1011 | ||
1012 | return err ?: size; | |
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(af_alg_sendpage); | |
1015 | ||
7d2c3f54 SM |
1016 | /** |
1017 | * af_alg_free_resources - release resources required for crypto request | |
1018 | */ | |
1019 | void af_alg_free_resources(struct af_alg_async_req *areq) | |
1020 | { | |
1021 | struct sock *sk = areq->sk; | |
1022 | ||
1023 | af_alg_free_areq_sgls(areq); | |
1024 | sock_kfree_s(sk, areq, areq->areqlen); | |
1025 | } | |
1026 | EXPORT_SYMBOL_GPL(af_alg_free_resources); | |
1027 | ||
2d97591e SM |
1028 | /** |
1029 | * af_alg_async_cb - AIO callback handler | |
1030 | * | |
1031 | * This handler cleans up the struct af_alg_async_req upon completion of the | |
1032 | * AIO operation. | |
1033 | * | |
1034 | * The number of bytes to be generated with the AIO operation must be set | |
1035 | * in areq->outlen before the AIO callback handler is invoked. | |
1036 | */ | |
1037 | void af_alg_async_cb(struct crypto_async_request *_req, int err) | |
1038 | { | |
1039 | struct af_alg_async_req *areq = _req->data; | |
1040 | struct sock *sk = areq->sk; | |
1041 | struct kiocb *iocb = areq->iocb; | |
1042 | unsigned int resultlen; | |
1043 | ||
2d97591e SM |
1044 | /* Buffer size written by crypto operation. */ |
1045 | resultlen = areq->outlen; | |
1046 | ||
7d2c3f54 SM |
1047 | af_alg_free_resources(areq); |
1048 | sock_put(sk); | |
2d97591e SM |
1049 | |
1050 | iocb->ki_complete(iocb, err ? err : resultlen, 0); | |
2d97591e SM |
1051 | } |
1052 | EXPORT_SYMBOL_GPL(af_alg_async_cb); | |
1053 | ||
a11e1d43 LT |
1054 | /** |
1055 | * af_alg_poll - poll system call handler | |
1056 | */ | |
1057 | __poll_t af_alg_poll(struct file *file, struct socket *sock, | |
1058 | poll_table *wait) | |
2d97591e SM |
1059 | { |
1060 | struct sock *sk = sock->sk; | |
1061 | struct alg_sock *ask = alg_sk(sk); | |
1062 | struct af_alg_ctx *ctx = ask->private; | |
a11e1d43 LT |
1063 | __poll_t mask; |
1064 | ||
89ab066d | 1065 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1066 | mask = 0; |
2d97591e SM |
1067 | |
1068 | if (!ctx->more || ctx->used) | |
a9a08845 | 1069 | mask |= EPOLLIN | EPOLLRDNORM; |
2d97591e SM |
1070 | |
1071 | if (af_alg_writable(sk)) | |
a9a08845 | 1072 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
2d97591e SM |
1073 | |
1074 | return mask; | |
1075 | } | |
a11e1d43 | 1076 | EXPORT_SYMBOL_GPL(af_alg_poll); |
2d97591e SM |
1077 | |
1078 | /** | |
1079 | * af_alg_alloc_areq - allocate struct af_alg_async_req | |
1080 | * | |
1081 | * @sk socket of connection to user space | |
1082 | * @areqlen size of struct af_alg_async_req + crypto_*_reqsize | |
1083 | * @return allocated data structure or ERR_PTR upon error | |
1084 | */ | |
1085 | struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk, | |
1086 | unsigned int areqlen) | |
1087 | { | |
1088 | struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL); | |
1089 | ||
1090 | if (unlikely(!areq)) | |
1091 | return ERR_PTR(-ENOMEM); | |
1092 | ||
1093 | areq->areqlen = areqlen; | |
1094 | areq->sk = sk; | |
1095 | areq->last_rsgl = NULL; | |
1096 | INIT_LIST_HEAD(&areq->rsgl_list); | |
1097 | areq->tsgl = NULL; | |
1098 | areq->tsgl_entries = 0; | |
1099 | ||
1100 | return areq; | |
1101 | } | |
1102 | EXPORT_SYMBOL_GPL(af_alg_alloc_areq); | |
1103 | ||
1104 | /** | |
1105 | * af_alg_get_rsgl - create the RX SGL for the output data from the crypto | |
1106 | * operation | |
1107 | * | |
1108 | * @sk socket of connection to user space | |
1109 | * @msg user space message | |
1110 | * @flags flags used to invoke recvmsg with | |
1111 | * @areq instance of the cryptographic request that will hold the RX SGL | |
1112 | * @maxsize maximum number of bytes to be pulled from user space | |
1113 | * @outlen number of bytes in the RX SGL | |
1114 | * @return 0 on success, < 0 upon error | |
1115 | */ | |
1116 | int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, | |
1117 | struct af_alg_async_req *areq, size_t maxsize, | |
1118 | size_t *outlen) | |
1119 | { | |
1120 | struct alg_sock *ask = alg_sk(sk); | |
1121 | struct af_alg_ctx *ctx = ask->private; | |
1122 | size_t len = 0; | |
1123 | ||
1124 | while (maxsize > len && msg_data_left(msg)) { | |
1125 | struct af_alg_rsgl *rsgl; | |
1126 | size_t seglen; | |
1127 | int err; | |
1128 | ||
1129 | /* limit the amount of readable buffers */ | |
1130 | if (!af_alg_readable(sk)) | |
1131 | break; | |
1132 | ||
2d97591e SM |
1133 | seglen = min_t(size_t, (maxsize - len), |
1134 | msg_data_left(msg)); | |
1135 | ||
1136 | if (list_empty(&areq->rsgl_list)) { | |
1137 | rsgl = &areq->first_rsgl; | |
1138 | } else { | |
1139 | rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL); | |
1140 | if (unlikely(!rsgl)) | |
1141 | return -ENOMEM; | |
1142 | } | |
1143 | ||
1144 | rsgl->sgl.npages = 0; | |
1145 | list_add_tail(&rsgl->list, &areq->rsgl_list); | |
1146 | ||
1147 | /* make one iovec available as scatterlist */ | |
1148 | err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); | |
2546da99 SM |
1149 | if (err < 0) { |
1150 | rsgl->sg_num_bytes = 0; | |
2d97591e | 1151 | return err; |
2546da99 | 1152 | } |
2d97591e SM |
1153 | |
1154 | /* chain the new scatterlist with previous one */ | |
1155 | if (areq->last_rsgl) | |
1156 | af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); | |
1157 | ||
1158 | areq->last_rsgl = rsgl; | |
1159 | len += err; | |
af955bf1 | 1160 | atomic_add(err, &ctx->rcvused); |
2d97591e SM |
1161 | rsgl->sg_num_bytes = err; |
1162 | iov_iter_advance(&msg->msg_iter, err); | |
1163 | } | |
1164 | ||
1165 | *outlen = len; | |
1166 | return 0; | |
1167 | } | |
1168 | EXPORT_SYMBOL_GPL(af_alg_get_rsgl); | |
1169 | ||
03c8efc1 HX |
1170 | static int __init af_alg_init(void) |
1171 | { | |
1172 | int err = proto_register(&alg_proto, 0); | |
1173 | ||
1174 | if (err) | |
1175 | goto out; | |
1176 | ||
1177 | err = sock_register(&alg_family); | |
1178 | if (err != 0) | |
1179 | goto out_unregister_proto; | |
1180 | ||
1181 | out: | |
1182 | return err; | |
1183 | ||
1184 | out_unregister_proto: | |
1185 | proto_unregister(&alg_proto); | |
1186 | goto out; | |
1187 | } | |
1188 | ||
1189 | static void __exit af_alg_exit(void) | |
1190 | { | |
1191 | sock_unregister(PF_ALG); | |
1192 | proto_unregister(&alg_proto); | |
1193 | } | |
1194 | ||
1195 | module_init(af_alg_init); | |
1196 | module_exit(af_alg_exit); | |
1197 | MODULE_LICENSE("GPL"); | |
1198 | MODULE_ALIAS_NETPROTO(AF_ALG); |