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Commit | Line | Data |
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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 | { | |
9060cb71 | 125 | if (sock->sk) { |
03c8efc1 | 126 | sock_put(sock->sk); |
9060cb71 MW |
127 | sock->sk = NULL; |
128 | } | |
03c8efc1 HX |
129 | return 0; |
130 | } | |
131 | EXPORT_SYMBOL_GPL(af_alg_release); | |
132 | ||
c840ac6a HX |
133 | void af_alg_release_parent(struct sock *sk) |
134 | { | |
135 | struct alg_sock *ask = alg_sk(sk); | |
a6a48c56 HX |
136 | unsigned int nokey = ask->nokey_refcnt; |
137 | bool last = nokey && !ask->refcnt; | |
c840ac6a HX |
138 | |
139 | sk = ask->parent; | |
140 | ask = alg_sk(sk); | |
141 | ||
142 | lock_sock(sk); | |
a6a48c56 HX |
143 | ask->nokey_refcnt -= nokey; |
144 | if (!last) | |
145 | last = !--ask->refcnt; | |
c840ac6a HX |
146 | release_sock(sk); |
147 | ||
148 | if (last) | |
149 | sock_put(sk); | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(af_alg_release_parent); | |
152 | ||
03c8efc1 HX |
153 | static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
154 | { | |
bb30b884 | 155 | const u32 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY; |
03c8efc1 HX |
156 | struct sock *sk = sock->sk; |
157 | struct alg_sock *ask = alg_sk(sk); | |
158 | struct sockaddr_alg *sa = (void *)uaddr; | |
159 | const struct af_alg_type *type; | |
160 | void *private; | |
c840ac6a | 161 | int err; |
03c8efc1 HX |
162 | |
163 | if (sock->state == SS_CONNECTED) | |
164 | return -EINVAL; | |
165 | ||
3f69cc60 | 166 | if (addr_len < sizeof(*sa)) |
03c8efc1 HX |
167 | return -EINVAL; |
168 | ||
a466856e ED |
169 | /* If caller uses non-allowed flag, return error. */ |
170 | if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed)) | |
171 | return -EINVAL; | |
172 | ||
03c8efc1 | 173 | sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
3f69cc60 | 174 | sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0; |
03c8efc1 HX |
175 | |
176 | type = alg_get_type(sa->salg_type); | |
177 | if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) { | |
178 | request_module("algif-%s", sa->salg_type); | |
179 | type = alg_get_type(sa->salg_type); | |
180 | } | |
181 | ||
182 | if (IS_ERR(type)) | |
183 | return PTR_ERR(type); | |
184 | ||
bb30b884 | 185 | private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
03c8efc1 HX |
186 | if (IS_ERR(private)) { |
187 | module_put(type->owner); | |
188 | return PTR_ERR(private); | |
189 | } | |
190 | ||
c840ac6a | 191 | err = -EBUSY; |
03c8efc1 | 192 | lock_sock(sk); |
a6a48c56 | 193 | if (ask->refcnt | ask->nokey_refcnt) |
c840ac6a | 194 | goto unlock; |
03c8efc1 HX |
195 | |
196 | swap(ask->type, type); | |
197 | swap(ask->private, private); | |
198 | ||
c840ac6a HX |
199 | err = 0; |
200 | ||
201 | unlock: | |
03c8efc1 HX |
202 | release_sock(sk); |
203 | ||
204 | alg_do_release(type, private); | |
205 | ||
c840ac6a | 206 | return err; |
03c8efc1 HX |
207 | } |
208 | ||
209 | static int alg_setkey(struct sock *sk, char __user *ukey, | |
210 | unsigned int keylen) | |
211 | { | |
212 | struct alg_sock *ask = alg_sk(sk); | |
213 | const struct af_alg_type *type = ask->type; | |
214 | u8 *key; | |
215 | int err; | |
216 | ||
217 | key = sock_kmalloc(sk, keylen, GFP_KERNEL); | |
218 | if (!key) | |
219 | return -ENOMEM; | |
220 | ||
221 | err = -EFAULT; | |
222 | if (copy_from_user(key, ukey, keylen)) | |
223 | goto out; | |
224 | ||
225 | err = type->setkey(ask->private, key, keylen); | |
226 | ||
227 | out: | |
ad202c8c | 228 | sock_kzfree_s(sk, key, keylen); |
03c8efc1 HX |
229 | |
230 | return err; | |
231 | } | |
232 | ||
233 | static int alg_setsockopt(struct socket *sock, int level, int optname, | |
234 | char __user *optval, unsigned int optlen) | |
235 | { | |
236 | struct sock *sk = sock->sk; | |
237 | struct alg_sock *ask = alg_sk(sk); | |
238 | const struct af_alg_type *type; | |
c840ac6a | 239 | int err = -EBUSY; |
03c8efc1 HX |
240 | |
241 | lock_sock(sk); | |
c840ac6a HX |
242 | if (ask->refcnt) |
243 | goto unlock; | |
244 | ||
03c8efc1 HX |
245 | type = ask->type; |
246 | ||
c840ac6a | 247 | err = -ENOPROTOOPT; |
03c8efc1 HX |
248 | if (level != SOL_ALG || !type) |
249 | goto unlock; | |
250 | ||
251 | switch (optname) { | |
252 | case ALG_SET_KEY: | |
253 | if (sock->state == SS_CONNECTED) | |
254 | goto unlock; | |
255 | if (!type->setkey) | |
256 | goto unlock; | |
257 | ||
258 | err = alg_setkey(sk, optval, optlen); | |
25fb8638 SM |
259 | break; |
260 | case ALG_SET_AEAD_AUTHSIZE: | |
261 | if (sock->state == SS_CONNECTED) | |
262 | goto unlock; | |
263 | if (!type->setauthsize) | |
264 | goto unlock; | |
265 | err = type->setauthsize(ask->private, optlen); | |
03c8efc1 HX |
266 | } |
267 | ||
268 | unlock: | |
269 | release_sock(sk); | |
270 | ||
271 | return err; | |
272 | } | |
273 | ||
cdfbabfb | 274 | int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern) |
03c8efc1 HX |
275 | { |
276 | struct alg_sock *ask = alg_sk(sk); | |
277 | const struct af_alg_type *type; | |
278 | struct sock *sk2; | |
6a935170 | 279 | unsigned int nokey; |
03c8efc1 HX |
280 | int err; |
281 | ||
282 | lock_sock(sk); | |
283 | type = ask->type; | |
284 | ||
285 | err = -EINVAL; | |
286 | if (!type) | |
287 | goto unlock; | |
288 | ||
cdfbabfb | 289 | sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
290 | err = -ENOMEM; |
291 | if (!sk2) | |
292 | goto unlock; | |
293 | ||
294 | sock_init_data(newsock, sk2); | |
2acce6aa | 295 | security_sock_graft(sk2, newsock); |
4c63f83c | 296 | security_sk_clone(sk, sk2); |
03c8efc1 HX |
297 | |
298 | err = type->accept(ask->private, sk2); | |
37766586 HX |
299 | |
300 | nokey = err == -ENOKEY; | |
301 | if (nokey && type->accept_nokey) | |
302 | err = type->accept_nokey(ask->private, sk2); | |
303 | ||
a383292c | 304 | if (err) |
03c8efc1 | 305 | goto unlock; |
03c8efc1 | 306 | |
37766586 | 307 | if (nokey || !ask->refcnt++) |
c840ac6a | 308 | sock_hold(sk); |
a6a48c56 | 309 | ask->nokey_refcnt += nokey; |
03c8efc1 HX |
310 | alg_sk(sk2)->parent = sk; |
311 | alg_sk(sk2)->type = type; | |
6a935170 | 312 | alg_sk(sk2)->nokey_refcnt = nokey; |
03c8efc1 HX |
313 | |
314 | newsock->ops = type->ops; | |
315 | newsock->state = SS_CONNECTED; | |
316 | ||
37766586 HX |
317 | if (nokey) |
318 | newsock->ops = type->ops_nokey; | |
319 | ||
03c8efc1 HX |
320 | err = 0; |
321 | ||
322 | unlock: | |
323 | release_sock(sk); | |
324 | ||
325 | return err; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(af_alg_accept); | |
328 | ||
cdfbabfb DH |
329 | static int alg_accept(struct socket *sock, struct socket *newsock, int flags, |
330 | bool kern) | |
03c8efc1 | 331 | { |
cdfbabfb | 332 | return af_alg_accept(sock->sk, newsock, kern); |
03c8efc1 HX |
333 | } |
334 | ||
335 | static const struct proto_ops alg_proto_ops = { | |
336 | .family = PF_ALG, | |
337 | .owner = THIS_MODULE, | |
338 | ||
339 | .connect = sock_no_connect, | |
340 | .socketpair = sock_no_socketpair, | |
341 | .getname = sock_no_getname, | |
342 | .ioctl = sock_no_ioctl, | |
343 | .listen = sock_no_listen, | |
344 | .shutdown = sock_no_shutdown, | |
345 | .getsockopt = sock_no_getsockopt, | |
346 | .mmap = sock_no_mmap, | |
347 | .sendpage = sock_no_sendpage, | |
348 | .sendmsg = sock_no_sendmsg, | |
349 | .recvmsg = sock_no_recvmsg, | |
03c8efc1 HX |
350 | |
351 | .bind = alg_bind, | |
352 | .release = af_alg_release, | |
353 | .setsockopt = alg_setsockopt, | |
354 | .accept = alg_accept, | |
355 | }; | |
356 | ||
357 | static void alg_sock_destruct(struct sock *sk) | |
358 | { | |
359 | struct alg_sock *ask = alg_sk(sk); | |
360 | ||
361 | alg_do_release(ask->type, ask->private); | |
362 | } | |
363 | ||
364 | static int alg_create(struct net *net, struct socket *sock, int protocol, | |
365 | int kern) | |
366 | { | |
367 | struct sock *sk; | |
368 | int err; | |
369 | ||
370 | if (sock->type != SOCK_SEQPACKET) | |
371 | return -ESOCKTNOSUPPORT; | |
372 | if (protocol != 0) | |
373 | return -EPROTONOSUPPORT; | |
374 | ||
375 | err = -ENOMEM; | |
11aa9c28 | 376 | sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
377 | if (!sk) |
378 | goto out; | |
379 | ||
380 | sock->ops = &alg_proto_ops; | |
381 | sock_init_data(sock, sk); | |
382 | ||
03c8efc1 HX |
383 | sk->sk_destruct = alg_sock_destruct; |
384 | ||
385 | return 0; | |
386 | out: | |
387 | return err; | |
388 | } | |
389 | ||
390 | static const struct net_proto_family alg_family = { | |
391 | .family = PF_ALG, | |
392 | .create = alg_create, | |
393 | .owner = THIS_MODULE, | |
394 | }; | |
395 | ||
1d10eb2f | 396 | int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) |
03c8efc1 | 397 | { |
1d10eb2f AV |
398 | size_t off; |
399 | ssize_t n; | |
400 | int npages, i; | |
03c8efc1 | 401 | |
1d10eb2f AV |
402 | n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off); |
403 | if (n < 0) | |
404 | return n; | |
03c8efc1 | 405 | |
9399f0c5 | 406 | npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
03c8efc1 | 407 | if (WARN_ON(npages == 0)) |
1d10eb2f | 408 | return -EINVAL; |
66db3739 TS |
409 | /* Add one extra for linking */ |
410 | sg_init_table(sgl->sg, npages + 1); | |
03c8efc1 | 411 | |
1d10eb2f | 412 | for (i = 0, len = n; i < npages; i++) { |
03c8efc1 HX |
413 | int plen = min_t(int, len, PAGE_SIZE - off); |
414 | ||
415 | sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); | |
416 | ||
417 | off = 0; | |
418 | len -= plen; | |
03c8efc1 | 419 | } |
66db3739 TS |
420 | sg_mark_end(sgl->sg + npages - 1); |
421 | sgl->npages = npages; | |
422 | ||
1d10eb2f | 423 | return n; |
03c8efc1 HX |
424 | } |
425 | EXPORT_SYMBOL_GPL(af_alg_make_sg); | |
426 | ||
466e0759 EB |
427 | static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, |
428 | struct af_alg_sgl *sgl_new) | |
66db3739 TS |
429 | { |
430 | sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); | |
431 | sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg); | |
432 | } | |
66db3739 | 433 | |
03c8efc1 HX |
434 | void af_alg_free_sg(struct af_alg_sgl *sgl) |
435 | { | |
436 | int i; | |
437 | ||
66db3739 | 438 | for (i = 0; i < sgl->npages; i++) |
03c8efc1 | 439 | put_page(sgl->pages[i]); |
03c8efc1 HX |
440 | } |
441 | EXPORT_SYMBOL_GPL(af_alg_free_sg); | |
442 | ||
466e0759 | 443 | static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con) |
03c8efc1 HX |
444 | { |
445 | struct cmsghdr *cmsg; | |
446 | ||
f95b414e | 447 | for_each_cmsghdr(cmsg, msg) { |
03c8efc1 HX |
448 | if (!CMSG_OK(msg, cmsg)) |
449 | return -EINVAL; | |
450 | if (cmsg->cmsg_level != SOL_ALG) | |
451 | continue; | |
452 | ||
267c4221 | 453 | switch (cmsg->cmsg_type) { |
03c8efc1 HX |
454 | case ALG_SET_IV: |
455 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv))) | |
456 | return -EINVAL; | |
457 | con->iv = (void *)CMSG_DATA(cmsg); | |
458 | if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen + | |
459 | sizeof(*con->iv))) | |
460 | return -EINVAL; | |
461 | break; | |
462 | ||
463 | case ALG_SET_OP: | |
464 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
465 | return -EINVAL; | |
466 | con->op = *(u32 *)CMSG_DATA(cmsg); | |
467 | break; | |
468 | ||
af8e8073 SM |
469 | case ALG_SET_AEAD_ASSOCLEN: |
470 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
471 | return -EINVAL; | |
472 | con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg); | |
473 | break; | |
474 | ||
03c8efc1 HX |
475 | default: |
476 | return -EINVAL; | |
477 | } | |
478 | } | |
479 | ||
480 | return 0; | |
481 | } | |
03c8efc1 | 482 | |
2d97591e SM |
483 | /** |
484 | * af_alg_alloc_tsgl - allocate the TX SGL | |
485 | * | |
486 | * @sk socket of connection to user space | |
487 | * @return: 0 upon success, < 0 upon error | |
488 | */ | |
466e0759 | 489 | static int af_alg_alloc_tsgl(struct sock *sk) |
2d97591e SM |
490 | { |
491 | struct alg_sock *ask = alg_sk(sk); | |
492 | struct af_alg_ctx *ctx = ask->private; | |
493 | struct af_alg_tsgl *sgl; | |
494 | struct scatterlist *sg = NULL; | |
495 | ||
496 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
497 | if (!list_empty(&ctx->tsgl_list)) | |
498 | sg = sgl->sg; | |
499 | ||
500 | if (!sg || sgl->cur >= MAX_SGL_ENTS) { | |
0ed2dd03 KC |
501 | sgl = sock_kmalloc(sk, |
502 | struct_size(sgl, sg, (MAX_SGL_ENTS + 1)), | |
2d97591e SM |
503 | GFP_KERNEL); |
504 | if (!sgl) | |
505 | return -ENOMEM; | |
506 | ||
507 | sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); | |
508 | sgl->cur = 0; | |
509 | ||
510 | if (sg) | |
511 | sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); | |
512 | ||
513 | list_add_tail(&sgl->list, &ctx->tsgl_list); | |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
2d97591e SM |
518 | |
519 | /** | |
520 | * aead_count_tsgl - Count number of TX SG entries | |
521 | * | |
522 | * The counting starts from the beginning of the SGL to @bytes. If | |
523 | * an offset is provided, the counting of the SG entries starts at the offset. | |
524 | * | |
525 | * @sk socket of connection to user space | |
526 | * @bytes Count the number of SG entries holding given number of bytes. | |
527 | * @offset Start the counting of SG entries from the given offset. | |
528 | * @return Number of TX SG entries found given the constraints | |
529 | */ | |
530 | unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset) | |
531 | { | |
7c39edfb EB |
532 | const struct alg_sock *ask = alg_sk(sk); |
533 | const struct af_alg_ctx *ctx = ask->private; | |
534 | const struct af_alg_tsgl *sgl; | |
2d97591e SM |
535 | unsigned int i; |
536 | unsigned int sgl_count = 0; | |
537 | ||
538 | if (!bytes) | |
539 | return 0; | |
540 | ||
7c39edfb EB |
541 | list_for_each_entry(sgl, &ctx->tsgl_list, list) { |
542 | const struct scatterlist *sg = sgl->sg; | |
2d97591e SM |
543 | |
544 | for (i = 0; i < sgl->cur; i++) { | |
545 | size_t bytes_count; | |
546 | ||
547 | /* Skip offset */ | |
548 | if (offset >= sg[i].length) { | |
549 | offset -= sg[i].length; | |
550 | bytes -= sg[i].length; | |
551 | continue; | |
552 | } | |
553 | ||
554 | bytes_count = sg[i].length - offset; | |
555 | ||
556 | offset = 0; | |
557 | sgl_count++; | |
558 | ||
559 | /* If we have seen requested number of bytes, stop */ | |
560 | if (bytes_count >= bytes) | |
561 | return sgl_count; | |
562 | ||
563 | bytes -= bytes_count; | |
564 | } | |
565 | } | |
566 | ||
567 | return sgl_count; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(af_alg_count_tsgl); | |
570 | ||
571 | /** | |
572 | * aead_pull_tsgl - Release the specified buffers from TX SGL | |
573 | * | |
574 | * If @dst is non-null, reassign the pages to dst. The caller must release | |
575 | * the pages. If @dst_offset is given only reassign the pages to @dst starting | |
576 | * at the @dst_offset (byte). The caller must ensure that @dst is large | |
577 | * enough (e.g. by using af_alg_count_tsgl with the same offset). | |
578 | * | |
579 | * @sk socket of connection to user space | |
580 | * @used Number of bytes to pull from TX SGL | |
581 | * @dst If non-NULL, buffer is reassigned to dst SGL instead of releasing. The | |
582 | * caller must release the buffers in dst. | |
583 | * @dst_offset Reassign the TX SGL from given offset. All buffers before | |
584 | * reaching the offset is released. | |
585 | */ | |
586 | void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, | |
587 | size_t dst_offset) | |
588 | { | |
589 | struct alg_sock *ask = alg_sk(sk); | |
590 | struct af_alg_ctx *ctx = ask->private; | |
591 | struct af_alg_tsgl *sgl; | |
592 | struct scatterlist *sg; | |
e117765a | 593 | unsigned int i, j = 0; |
2d97591e SM |
594 | |
595 | while (!list_empty(&ctx->tsgl_list)) { | |
596 | sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, | |
597 | list); | |
598 | sg = sgl->sg; | |
599 | ||
e117765a | 600 | for (i = 0; i < sgl->cur; i++) { |
2d97591e SM |
601 | size_t plen = min_t(size_t, used, sg[i].length); |
602 | struct page *page = sg_page(sg + i); | |
603 | ||
604 | if (!page) | |
605 | continue; | |
606 | ||
607 | /* | |
608 | * Assumption: caller created af_alg_count_tsgl(len) | |
609 | * SG entries in dst. | |
610 | */ | |
611 | if (dst) { | |
612 | if (dst_offset >= plen) { | |
613 | /* discard page before offset */ | |
614 | dst_offset -= plen; | |
2d97591e SM |
615 | } else { |
616 | /* reassign page to dst after offset */ | |
2d45a7e8 | 617 | get_page(page); |
2d97591e SM |
618 | sg_set_page(dst + j, page, |
619 | plen - dst_offset, | |
620 | sg[i].offset + dst_offset); | |
621 | dst_offset = 0; | |
622 | j++; | |
623 | } | |
624 | } | |
625 | ||
626 | sg[i].length -= plen; | |
627 | sg[i].offset += plen; | |
628 | ||
629 | used -= plen; | |
630 | ctx->used -= plen; | |
631 | ||
632 | if (sg[i].length) | |
633 | return; | |
634 | ||
2d45a7e8 | 635 | put_page(page); |
2d97591e SM |
636 | sg_assign_page(sg + i, NULL); |
637 | } | |
638 | ||
639 | list_del(&sgl->list); | |
91e14842 | 640 | sock_kfree_s(sk, sgl, struct_size(sgl, sg, MAX_SGL_ENTS + 1)); |
2d97591e SM |
641 | } |
642 | ||
643 | if (!ctx->used) | |
644 | ctx->merge = 0; | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); | |
647 | ||
648 | /** | |
649 | * af_alg_free_areq_sgls - Release TX and RX SGLs of the request | |
650 | * | |
651 | * @areq Request holding the TX and RX SGL | |
652 | */ | |
466e0759 | 653 | static void af_alg_free_areq_sgls(struct af_alg_async_req *areq) |
2d97591e SM |
654 | { |
655 | struct sock *sk = areq->sk; | |
656 | struct alg_sock *ask = alg_sk(sk); | |
657 | struct af_alg_ctx *ctx = ask->private; | |
658 | struct af_alg_rsgl *rsgl, *tmp; | |
659 | struct scatterlist *tsgl; | |
660 | struct scatterlist *sg; | |
661 | unsigned int i; | |
662 | ||
663 | list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) { | |
af955bf1 | 664 | atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused); |
2d97591e SM |
665 | af_alg_free_sg(&rsgl->sgl); |
666 | list_del(&rsgl->list); | |
667 | if (rsgl != &areq->first_rsgl) | |
668 | sock_kfree_s(sk, rsgl, sizeof(*rsgl)); | |
669 | } | |
670 | ||
671 | tsgl = areq->tsgl; | |
887207ed EB |
672 | if (tsgl) { |
673 | for_each_sg(tsgl, sg, areq->tsgl_entries, i) { | |
674 | if (!sg_page(sg)) | |
675 | continue; | |
676 | put_page(sg_page(sg)); | |
677 | } | |
2d97591e | 678 | |
2d97591e | 679 | sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl)); |
887207ed | 680 | } |
2d97591e | 681 | } |
2d97591e SM |
682 | |
683 | /** | |
684 | * af_alg_wait_for_wmem - wait for availability of writable memory | |
685 | * | |
686 | * @sk socket of connection to user space | |
687 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
688 | * @return 0 when writable memory is available, < 0 upon error | |
689 | */ | |
466e0759 | 690 | static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags) |
2d97591e SM |
691 | { |
692 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
693 | int err = -ERESTARTSYS; | |
694 | long timeout; | |
695 | ||
696 | if (flags & MSG_DONTWAIT) | |
697 | return -EAGAIN; | |
698 | ||
699 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
700 | ||
701 | add_wait_queue(sk_sleep(sk), &wait); | |
702 | for (;;) { | |
703 | if (signal_pending(current)) | |
704 | break; | |
705 | timeout = MAX_SCHEDULE_TIMEOUT; | |
706 | if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) { | |
707 | err = 0; | |
708 | break; | |
709 | } | |
710 | } | |
711 | remove_wait_queue(sk_sleep(sk), &wait); | |
712 | ||
713 | return err; | |
714 | } | |
2d97591e SM |
715 | |
716 | /** | |
717 | * af_alg_wmem_wakeup - wakeup caller when writable memory is available | |
718 | * | |
719 | * @sk socket of connection to user space | |
720 | */ | |
721 | void af_alg_wmem_wakeup(struct sock *sk) | |
722 | { | |
723 | struct socket_wq *wq; | |
724 | ||
725 | if (!af_alg_writable(sk)) | |
726 | return; | |
727 | ||
728 | rcu_read_lock(); | |
729 | wq = rcu_dereference(sk->sk_wq); | |
730 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
731 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | |
732 | EPOLLRDNORM | | |
733 | EPOLLRDBAND); | |
2d97591e SM |
734 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
735 | rcu_read_unlock(); | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); | |
738 | ||
739 | /** | |
740 | * af_alg_wait_for_data - wait for availability of TX data | |
741 | * | |
742 | * @sk socket of connection to user space | |
743 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
744 | * @return 0 when writable memory is available, < 0 upon error | |
745 | */ | |
746 | int af_alg_wait_for_data(struct sock *sk, unsigned flags) | |
747 | { | |
748 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
749 | struct alg_sock *ask = alg_sk(sk); | |
750 | struct af_alg_ctx *ctx = ask->private; | |
751 | long timeout; | |
752 | int err = -ERESTARTSYS; | |
753 | ||
754 | if (flags & MSG_DONTWAIT) | |
755 | return -EAGAIN; | |
756 | ||
757 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
758 | ||
759 | add_wait_queue(sk_sleep(sk), &wait); | |
760 | for (;;) { | |
761 | if (signal_pending(current)) | |
762 | break; | |
763 | timeout = MAX_SCHEDULE_TIMEOUT; | |
764 | if (sk_wait_event(sk, &timeout, (ctx->used || !ctx->more), | |
765 | &wait)) { | |
766 | err = 0; | |
767 | break; | |
768 | } | |
769 | } | |
770 | remove_wait_queue(sk_sleep(sk), &wait); | |
771 | ||
772 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
773 | ||
774 | return err; | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(af_alg_wait_for_data); | |
777 | ||
778 | /** | |
779 | * af_alg_data_wakeup - wakeup caller when new data can be sent to kernel | |
780 | * | |
781 | * @sk socket of connection to user space | |
782 | */ | |
466e0759 | 783 | static void af_alg_data_wakeup(struct sock *sk) |
2d97591e SM |
784 | { |
785 | struct alg_sock *ask = alg_sk(sk); | |
786 | struct af_alg_ctx *ctx = ask->private; | |
787 | struct socket_wq *wq; | |
788 | ||
789 | if (!ctx->used) | |
790 | return; | |
791 | ||
792 | rcu_read_lock(); | |
793 | wq = rcu_dereference(sk->sk_wq); | |
794 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
795 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
796 | EPOLLRDNORM | | |
797 | EPOLLRDBAND); | |
2d97591e SM |
798 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
799 | rcu_read_unlock(); | |
800 | } | |
2d97591e SM |
801 | |
802 | /** | |
803 | * af_alg_sendmsg - implementation of sendmsg system call handler | |
804 | * | |
805 | * The sendmsg system call handler obtains the user data and stores it | |
806 | * in ctx->tsgl_list. This implies allocation of the required numbers of | |
807 | * struct af_alg_tsgl. | |
808 | * | |
809 | * In addition, the ctx is filled with the information sent via CMSG. | |
810 | * | |
811 | * @sock socket of connection to user space | |
812 | * @msg message from user space | |
813 | * @size size of message from user space | |
814 | * @ivsize the size of the IV for the cipher operation to verify that the | |
815 | * user-space-provided IV has the right size | |
816 | * @return the number of copied data upon success, < 0 upon error | |
817 | */ | |
818 | int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
819 | unsigned int ivsize) | |
820 | { | |
821 | struct sock *sk = sock->sk; | |
822 | struct alg_sock *ask = alg_sk(sk); | |
823 | struct af_alg_ctx *ctx = ask->private; | |
824 | struct af_alg_tsgl *sgl; | |
825 | struct af_alg_control con = {}; | |
826 | long copied = 0; | |
827 | bool enc = 0; | |
828 | bool init = 0; | |
829 | int err = 0; | |
830 | ||
831 | if (msg->msg_controllen) { | |
832 | err = af_alg_cmsg_send(msg, &con); | |
833 | if (err) | |
834 | return err; | |
835 | ||
836 | init = 1; | |
837 | switch (con.op) { | |
838 | case ALG_OP_ENCRYPT: | |
839 | enc = 1; | |
840 | break; | |
841 | case ALG_OP_DECRYPT: | |
842 | enc = 0; | |
843 | break; | |
844 | default: | |
845 | return -EINVAL; | |
846 | } | |
847 | ||
848 | if (con.iv && con.iv->ivlen != ivsize) | |
849 | return -EINVAL; | |
850 | } | |
851 | ||
852 | lock_sock(sk); | |
853 | if (!ctx->more && ctx->used) { | |
854 | err = -EINVAL; | |
855 | goto unlock; | |
856 | } | |
857 | ||
858 | if (init) { | |
859 | ctx->enc = enc; | |
860 | if (con.iv) | |
861 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
862 | ||
863 | ctx->aead_assoclen = con.aead_assoclen; | |
864 | } | |
865 | ||
866 | while (size) { | |
867 | struct scatterlist *sg; | |
868 | size_t len = size; | |
869 | size_t plen; | |
870 | ||
871 | /* use the existing memory in an allocated page */ | |
872 | if (ctx->merge) { | |
873 | sgl = list_entry(ctx->tsgl_list.prev, | |
874 | struct af_alg_tsgl, list); | |
875 | sg = sgl->sg + sgl->cur - 1; | |
876 | len = min_t(size_t, len, | |
877 | PAGE_SIZE - sg->offset - sg->length); | |
878 | ||
879 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
880 | sg->offset + sg->length, | |
881 | msg, len); | |
882 | if (err) | |
883 | goto unlock; | |
884 | ||
885 | sg->length += len; | |
886 | ctx->merge = (sg->offset + sg->length) & | |
887 | (PAGE_SIZE - 1); | |
888 | ||
889 | ctx->used += len; | |
890 | copied += len; | |
891 | size -= len; | |
892 | continue; | |
893 | } | |
894 | ||
895 | if (!af_alg_writable(sk)) { | |
896 | err = af_alg_wait_for_wmem(sk, msg->msg_flags); | |
897 | if (err) | |
898 | goto unlock; | |
899 | } | |
900 | ||
901 | /* allocate a new page */ | |
902 | len = min_t(unsigned long, len, af_alg_sndbuf(sk)); | |
903 | ||
904 | err = af_alg_alloc_tsgl(sk); | |
905 | if (err) | |
906 | goto unlock; | |
907 | ||
908 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, | |
909 | list); | |
910 | sg = sgl->sg; | |
911 | if (sgl->cur) | |
912 | sg_unmark_end(sg + sgl->cur - 1); | |
913 | ||
914 | do { | |
915 | unsigned int i = sgl->cur; | |
916 | ||
917 | plen = min_t(size_t, len, PAGE_SIZE); | |
918 | ||
919 | sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); | |
920 | if (!sg_page(sg + i)) { | |
921 | err = -ENOMEM; | |
922 | goto unlock; | |
923 | } | |
924 | ||
925 | err = memcpy_from_msg(page_address(sg_page(sg + i)), | |
926 | msg, plen); | |
927 | if (err) { | |
928 | __free_page(sg_page(sg + i)); | |
929 | sg_assign_page(sg + i, NULL); | |
930 | goto unlock; | |
931 | } | |
932 | ||
933 | sg[i].length = plen; | |
934 | len -= plen; | |
935 | ctx->used += plen; | |
936 | copied += plen; | |
937 | size -= plen; | |
938 | sgl->cur++; | |
939 | } while (len && sgl->cur < MAX_SGL_ENTS); | |
940 | ||
941 | if (!size) | |
942 | sg_mark_end(sg + sgl->cur - 1); | |
943 | ||
944 | ctx->merge = plen & (PAGE_SIZE - 1); | |
945 | } | |
946 | ||
947 | err = 0; | |
948 | ||
949 | ctx->more = msg->msg_flags & MSG_MORE; | |
950 | ||
951 | unlock: | |
952 | af_alg_data_wakeup(sk); | |
953 | release_sock(sk); | |
954 | ||
955 | return copied ?: err; | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(af_alg_sendmsg); | |
958 | ||
959 | /** | |
960 | * af_alg_sendpage - sendpage system call handler | |
961 | * | |
962 | * This is a generic implementation of sendpage to fill ctx->tsgl_list. | |
963 | */ | |
964 | ssize_t af_alg_sendpage(struct socket *sock, struct page *page, | |
965 | int offset, size_t size, int flags) | |
966 | { | |
967 | struct sock *sk = sock->sk; | |
968 | struct alg_sock *ask = alg_sk(sk); | |
969 | struct af_alg_ctx *ctx = ask->private; | |
970 | struct af_alg_tsgl *sgl; | |
971 | int err = -EINVAL; | |
972 | ||
973 | if (flags & MSG_SENDPAGE_NOTLAST) | |
974 | flags |= MSG_MORE; | |
975 | ||
976 | lock_sock(sk); | |
977 | if (!ctx->more && ctx->used) | |
978 | goto unlock; | |
979 | ||
980 | if (!size) | |
981 | goto done; | |
982 | ||
983 | if (!af_alg_writable(sk)) { | |
984 | err = af_alg_wait_for_wmem(sk, flags); | |
985 | if (err) | |
986 | goto unlock; | |
987 | } | |
988 | ||
989 | err = af_alg_alloc_tsgl(sk); | |
990 | if (err) | |
991 | goto unlock; | |
992 | ||
993 | ctx->merge = 0; | |
994 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
995 | ||
996 | if (sgl->cur) | |
997 | sg_unmark_end(sgl->sg + sgl->cur - 1); | |
998 | ||
999 | sg_mark_end(sgl->sg + sgl->cur); | |
1000 | ||
1001 | get_page(page); | |
1002 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
1003 | sgl->cur++; | |
1004 | ctx->used += size; | |
1005 | ||
1006 | done: | |
1007 | ctx->more = flags & MSG_MORE; | |
1008 | ||
1009 | unlock: | |
1010 | af_alg_data_wakeup(sk); | |
1011 | release_sock(sk); | |
1012 | ||
1013 | return err ?: size; | |
1014 | } | |
1015 | EXPORT_SYMBOL_GPL(af_alg_sendpage); | |
1016 | ||
7d2c3f54 SM |
1017 | /** |
1018 | * af_alg_free_resources - release resources required for crypto request | |
1019 | */ | |
1020 | void af_alg_free_resources(struct af_alg_async_req *areq) | |
1021 | { | |
1022 | struct sock *sk = areq->sk; | |
1023 | ||
1024 | af_alg_free_areq_sgls(areq); | |
1025 | sock_kfree_s(sk, areq, areq->areqlen); | |
1026 | } | |
1027 | EXPORT_SYMBOL_GPL(af_alg_free_resources); | |
1028 | ||
2d97591e SM |
1029 | /** |
1030 | * af_alg_async_cb - AIO callback handler | |
1031 | * | |
1032 | * This handler cleans up the struct af_alg_async_req upon completion of the | |
1033 | * AIO operation. | |
1034 | * | |
1035 | * The number of bytes to be generated with the AIO operation must be set | |
1036 | * in areq->outlen before the AIO callback handler is invoked. | |
1037 | */ | |
1038 | void af_alg_async_cb(struct crypto_async_request *_req, int err) | |
1039 | { | |
1040 | struct af_alg_async_req *areq = _req->data; | |
1041 | struct sock *sk = areq->sk; | |
1042 | struct kiocb *iocb = areq->iocb; | |
1043 | unsigned int resultlen; | |
1044 | ||
2d97591e SM |
1045 | /* Buffer size written by crypto operation. */ |
1046 | resultlen = areq->outlen; | |
1047 | ||
7d2c3f54 SM |
1048 | af_alg_free_resources(areq); |
1049 | sock_put(sk); | |
2d97591e SM |
1050 | |
1051 | iocb->ki_complete(iocb, err ? err : resultlen, 0); | |
2d97591e SM |
1052 | } |
1053 | EXPORT_SYMBOL_GPL(af_alg_async_cb); | |
1054 | ||
a11e1d43 LT |
1055 | /** |
1056 | * af_alg_poll - poll system call handler | |
1057 | */ | |
1058 | __poll_t af_alg_poll(struct file *file, struct socket *sock, | |
1059 | poll_table *wait) | |
2d97591e SM |
1060 | { |
1061 | struct sock *sk = sock->sk; | |
1062 | struct alg_sock *ask = alg_sk(sk); | |
1063 | struct af_alg_ctx *ctx = ask->private; | |
a11e1d43 LT |
1064 | __poll_t mask; |
1065 | ||
89ab066d | 1066 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1067 | mask = 0; |
2d97591e SM |
1068 | |
1069 | if (!ctx->more || ctx->used) | |
a9a08845 | 1070 | mask |= EPOLLIN | EPOLLRDNORM; |
2d97591e SM |
1071 | |
1072 | if (af_alg_writable(sk)) | |
a9a08845 | 1073 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
2d97591e SM |
1074 | |
1075 | return mask; | |
1076 | } | |
a11e1d43 | 1077 | EXPORT_SYMBOL_GPL(af_alg_poll); |
2d97591e SM |
1078 | |
1079 | /** | |
1080 | * af_alg_alloc_areq - allocate struct af_alg_async_req | |
1081 | * | |
1082 | * @sk socket of connection to user space | |
1083 | * @areqlen size of struct af_alg_async_req + crypto_*_reqsize | |
1084 | * @return allocated data structure or ERR_PTR upon error | |
1085 | */ | |
1086 | struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk, | |
1087 | unsigned int areqlen) | |
1088 | { | |
1089 | struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL); | |
1090 | ||
1091 | if (unlikely(!areq)) | |
1092 | return ERR_PTR(-ENOMEM); | |
1093 | ||
1094 | areq->areqlen = areqlen; | |
1095 | areq->sk = sk; | |
1096 | areq->last_rsgl = NULL; | |
1097 | INIT_LIST_HEAD(&areq->rsgl_list); | |
1098 | areq->tsgl = NULL; | |
1099 | areq->tsgl_entries = 0; | |
1100 | ||
1101 | return areq; | |
1102 | } | |
1103 | EXPORT_SYMBOL_GPL(af_alg_alloc_areq); | |
1104 | ||
1105 | /** | |
1106 | * af_alg_get_rsgl - create the RX SGL for the output data from the crypto | |
1107 | * operation | |
1108 | * | |
1109 | * @sk socket of connection to user space | |
1110 | * @msg user space message | |
1111 | * @flags flags used to invoke recvmsg with | |
1112 | * @areq instance of the cryptographic request that will hold the RX SGL | |
1113 | * @maxsize maximum number of bytes to be pulled from user space | |
1114 | * @outlen number of bytes in the RX SGL | |
1115 | * @return 0 on success, < 0 upon error | |
1116 | */ | |
1117 | int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, | |
1118 | struct af_alg_async_req *areq, size_t maxsize, | |
1119 | size_t *outlen) | |
1120 | { | |
1121 | struct alg_sock *ask = alg_sk(sk); | |
1122 | struct af_alg_ctx *ctx = ask->private; | |
1123 | size_t len = 0; | |
1124 | ||
1125 | while (maxsize > len && msg_data_left(msg)) { | |
1126 | struct af_alg_rsgl *rsgl; | |
1127 | size_t seglen; | |
1128 | int err; | |
1129 | ||
1130 | /* limit the amount of readable buffers */ | |
1131 | if (!af_alg_readable(sk)) | |
1132 | break; | |
1133 | ||
2d97591e SM |
1134 | seglen = min_t(size_t, (maxsize - len), |
1135 | msg_data_left(msg)); | |
1136 | ||
1137 | if (list_empty(&areq->rsgl_list)) { | |
1138 | rsgl = &areq->first_rsgl; | |
1139 | } else { | |
1140 | rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL); | |
1141 | if (unlikely(!rsgl)) | |
1142 | return -ENOMEM; | |
1143 | } | |
1144 | ||
1145 | rsgl->sgl.npages = 0; | |
1146 | list_add_tail(&rsgl->list, &areq->rsgl_list); | |
1147 | ||
1148 | /* make one iovec available as scatterlist */ | |
1149 | err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); | |
2546da99 SM |
1150 | if (err < 0) { |
1151 | rsgl->sg_num_bytes = 0; | |
2d97591e | 1152 | return err; |
2546da99 | 1153 | } |
2d97591e SM |
1154 | |
1155 | /* chain the new scatterlist with previous one */ | |
1156 | if (areq->last_rsgl) | |
1157 | af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); | |
1158 | ||
1159 | areq->last_rsgl = rsgl; | |
1160 | len += err; | |
af955bf1 | 1161 | atomic_add(err, &ctx->rcvused); |
2d97591e SM |
1162 | rsgl->sg_num_bytes = err; |
1163 | iov_iter_advance(&msg->msg_iter, err); | |
1164 | } | |
1165 | ||
1166 | *outlen = len; | |
1167 | return 0; | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(af_alg_get_rsgl); | |
1170 | ||
03c8efc1 HX |
1171 | static int __init af_alg_init(void) |
1172 | { | |
1173 | int err = proto_register(&alg_proto, 0); | |
1174 | ||
1175 | if (err) | |
1176 | goto out; | |
1177 | ||
1178 | err = sock_register(&alg_family); | |
1179 | if (err != 0) | |
1180 | goto out_unregister_proto; | |
1181 | ||
1182 | out: | |
1183 | return err; | |
1184 | ||
1185 | out_unregister_proto: | |
1186 | proto_unregister(&alg_proto); | |
1187 | goto out; | |
1188 | } | |
1189 | ||
1190 | static void __exit af_alg_exit(void) | |
1191 | { | |
1192 | sock_unregister(PF_ALG); | |
1193 | proto_unregister(&alg_proto); | |
1194 | } | |
1195 | ||
1196 | module_init(af_alg_init); | |
1197 | module_exit(af_alg_exit); | |
1198 | MODULE_LICENSE("GPL"); | |
1199 | MODULE_ALIAS_NETPROTO(AF_ALG); |