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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
03c8efc1 HX |
2 | /* |
3 | * af_alg: User-space algorithm interface | |
4 | * | |
5 | * This file provides the user-space API for algorithms. | |
6 | * | |
7 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
03c8efc1 HX |
8 | */ |
9 | ||
60063497 | 10 | #include <linux/atomic.h> |
03c8efc1 HX |
11 | #include <crypto/if_alg.h> |
12 | #include <linux/crypto.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/net.h> | |
18 | #include <linux/rwsem.h> | |
2d97591e | 19 | #include <linux/sched/signal.h> |
4c63f83c | 20 | #include <linux/security.h> |
03c8efc1 HX |
21 | |
22 | struct alg_type_list { | |
23 | const struct af_alg_type *type; | |
24 | struct list_head list; | |
25 | }; | |
26 | ||
06869524 | 27 | static atomic_long_t alg_memory_allocated; |
03c8efc1 HX |
28 | |
29 | static struct proto alg_proto = { | |
30 | .name = "ALG", | |
31 | .owner = THIS_MODULE, | |
32 | .memory_allocated = &alg_memory_allocated, | |
33 | .obj_size = sizeof(struct alg_sock), | |
34 | }; | |
35 | ||
36 | static LIST_HEAD(alg_types); | |
37 | static DECLARE_RWSEM(alg_types_sem); | |
38 | ||
39 | static const struct af_alg_type *alg_get_type(const char *name) | |
40 | { | |
41 | const struct af_alg_type *type = ERR_PTR(-ENOENT); | |
42 | struct alg_type_list *node; | |
43 | ||
44 | down_read(&alg_types_sem); | |
45 | list_for_each_entry(node, &alg_types, list) { | |
46 | if (strcmp(node->type->name, name)) | |
47 | continue; | |
48 | ||
49 | if (try_module_get(node->type->owner)) | |
50 | type = node->type; | |
51 | break; | |
52 | } | |
53 | up_read(&alg_types_sem); | |
54 | ||
55 | return type; | |
56 | } | |
57 | ||
58 | int af_alg_register_type(const struct af_alg_type *type) | |
59 | { | |
60 | struct alg_type_list *node; | |
61 | int err = -EEXIST; | |
62 | ||
63 | down_write(&alg_types_sem); | |
64 | list_for_each_entry(node, &alg_types, list) { | |
65 | if (!strcmp(node->type->name, type->name)) | |
66 | goto unlock; | |
67 | } | |
68 | ||
69 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
70 | err = -ENOMEM; | |
71 | if (!node) | |
72 | goto unlock; | |
73 | ||
74 | type->ops->owner = THIS_MODULE; | |
37766586 HX |
75 | if (type->ops_nokey) |
76 | type->ops_nokey->owner = THIS_MODULE; | |
03c8efc1 HX |
77 | node->type = type; |
78 | list_add(&node->list, &alg_types); | |
79 | err = 0; | |
80 | ||
81 | unlock: | |
82 | up_write(&alg_types_sem); | |
83 | ||
84 | return err; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(af_alg_register_type); | |
87 | ||
88 | int af_alg_unregister_type(const struct af_alg_type *type) | |
89 | { | |
90 | struct alg_type_list *node; | |
91 | int err = -ENOENT; | |
92 | ||
93 | down_write(&alg_types_sem); | |
94 | list_for_each_entry(node, &alg_types, list) { | |
95 | if (strcmp(node->type->name, type->name)) | |
96 | continue; | |
97 | ||
98 | list_del(&node->list); | |
99 | kfree(node); | |
100 | err = 0; | |
101 | break; | |
102 | } | |
103 | up_write(&alg_types_sem); | |
104 | ||
105 | return err; | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(af_alg_unregister_type); | |
108 | ||
109 | static void alg_do_release(const struct af_alg_type *type, void *private) | |
110 | { | |
111 | if (!type) | |
112 | return; | |
113 | ||
114 | type->release(private); | |
115 | module_put(type->owner); | |
116 | } | |
117 | ||
118 | int af_alg_release(struct socket *sock) | |
119 | { | |
9060cb71 | 120 | if (sock->sk) { |
03c8efc1 | 121 | sock_put(sock->sk); |
9060cb71 MW |
122 | sock->sk = NULL; |
123 | } | |
03c8efc1 HX |
124 | return 0; |
125 | } | |
126 | EXPORT_SYMBOL_GPL(af_alg_release); | |
127 | ||
c840ac6a HX |
128 | void af_alg_release_parent(struct sock *sk) |
129 | { | |
130 | struct alg_sock *ask = alg_sk(sk); | |
a6a48c56 HX |
131 | unsigned int nokey = ask->nokey_refcnt; |
132 | bool last = nokey && !ask->refcnt; | |
c840ac6a HX |
133 | |
134 | sk = ask->parent; | |
135 | ask = alg_sk(sk); | |
136 | ||
37f96694 HX |
137 | local_bh_disable(); |
138 | bh_lock_sock(sk); | |
a6a48c56 HX |
139 | ask->nokey_refcnt -= nokey; |
140 | if (!last) | |
141 | last = !--ask->refcnt; | |
37f96694 HX |
142 | bh_unlock_sock(sk); |
143 | local_bh_enable(); | |
c840ac6a HX |
144 | |
145 | if (last) | |
146 | sock_put(sk); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(af_alg_release_parent); | |
149 | ||
03c8efc1 HX |
150 | static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
151 | { | |
bb30b884 | 152 | const u32 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY; |
03c8efc1 HX |
153 | struct sock *sk = sock->sk; |
154 | struct alg_sock *ask = alg_sk(sk); | |
155 | struct sockaddr_alg *sa = (void *)uaddr; | |
156 | const struct af_alg_type *type; | |
157 | void *private; | |
c840ac6a | 158 | int err; |
03c8efc1 HX |
159 | |
160 | if (sock->state == SS_CONNECTED) | |
161 | return -EINVAL; | |
162 | ||
3f69cc60 | 163 | if (addr_len < sizeof(*sa)) |
03c8efc1 HX |
164 | return -EINVAL; |
165 | ||
a466856e ED |
166 | /* If caller uses non-allowed flag, return error. */ |
167 | if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed)) | |
168 | return -EINVAL; | |
169 | ||
03c8efc1 | 170 | sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
3f69cc60 | 171 | sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0; |
03c8efc1 HX |
172 | |
173 | type = alg_get_type(sa->salg_type); | |
45586c70 | 174 | if (PTR_ERR(type) == -ENOENT) { |
03c8efc1 HX |
175 | request_module("algif-%s", sa->salg_type); |
176 | type = alg_get_type(sa->salg_type); | |
177 | } | |
178 | ||
179 | if (IS_ERR(type)) | |
180 | return PTR_ERR(type); | |
181 | ||
bb30b884 | 182 | private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
03c8efc1 HX |
183 | if (IS_ERR(private)) { |
184 | module_put(type->owner); | |
185 | return PTR_ERR(private); | |
186 | } | |
187 | ||
c840ac6a | 188 | err = -EBUSY; |
03c8efc1 | 189 | lock_sock(sk); |
a6a48c56 | 190 | if (ask->refcnt | ask->nokey_refcnt) |
c840ac6a | 191 | goto unlock; |
03c8efc1 HX |
192 | |
193 | swap(ask->type, type); | |
194 | swap(ask->private, private); | |
195 | ||
c840ac6a HX |
196 | err = 0; |
197 | ||
198 | unlock: | |
03c8efc1 HX |
199 | release_sock(sk); |
200 | ||
201 | alg_do_release(type, private); | |
202 | ||
c840ac6a | 203 | return err; |
03c8efc1 HX |
204 | } |
205 | ||
206 | static int alg_setkey(struct sock *sk, char __user *ukey, | |
207 | unsigned int keylen) | |
208 | { | |
209 | struct alg_sock *ask = alg_sk(sk); | |
210 | const struct af_alg_type *type = ask->type; | |
211 | u8 *key; | |
212 | int err; | |
213 | ||
214 | key = sock_kmalloc(sk, keylen, GFP_KERNEL); | |
215 | if (!key) | |
216 | return -ENOMEM; | |
217 | ||
218 | err = -EFAULT; | |
219 | if (copy_from_user(key, ukey, keylen)) | |
220 | goto out; | |
221 | ||
222 | err = type->setkey(ask->private, key, keylen); | |
223 | ||
224 | out: | |
ad202c8c | 225 | sock_kzfree_s(sk, key, keylen); |
03c8efc1 HX |
226 | |
227 | return err; | |
228 | } | |
229 | ||
230 | static int alg_setsockopt(struct socket *sock, int level, int optname, | |
231 | char __user *optval, unsigned int optlen) | |
232 | { | |
233 | struct sock *sk = sock->sk; | |
234 | struct alg_sock *ask = alg_sk(sk); | |
235 | const struct af_alg_type *type; | |
c840ac6a | 236 | int err = -EBUSY; |
03c8efc1 HX |
237 | |
238 | lock_sock(sk); | |
c840ac6a HX |
239 | if (ask->refcnt) |
240 | goto unlock; | |
241 | ||
03c8efc1 HX |
242 | type = ask->type; |
243 | ||
c840ac6a | 244 | err = -ENOPROTOOPT; |
03c8efc1 HX |
245 | if (level != SOL_ALG || !type) |
246 | goto unlock; | |
247 | ||
248 | switch (optname) { | |
249 | case ALG_SET_KEY: | |
250 | if (sock->state == SS_CONNECTED) | |
251 | goto unlock; | |
252 | if (!type->setkey) | |
253 | goto unlock; | |
254 | ||
255 | err = alg_setkey(sk, optval, optlen); | |
25fb8638 SM |
256 | break; |
257 | case ALG_SET_AEAD_AUTHSIZE: | |
258 | if (sock->state == SS_CONNECTED) | |
259 | goto unlock; | |
260 | if (!type->setauthsize) | |
261 | goto unlock; | |
262 | err = type->setauthsize(ask->private, optlen); | |
03c8efc1 HX |
263 | } |
264 | ||
265 | unlock: | |
266 | release_sock(sk); | |
267 | ||
268 | return err; | |
269 | } | |
270 | ||
cdfbabfb | 271 | int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern) |
03c8efc1 HX |
272 | { |
273 | struct alg_sock *ask = alg_sk(sk); | |
274 | const struct af_alg_type *type; | |
275 | struct sock *sk2; | |
6a935170 | 276 | unsigned int nokey; |
03c8efc1 HX |
277 | int err; |
278 | ||
279 | lock_sock(sk); | |
280 | type = ask->type; | |
281 | ||
282 | err = -EINVAL; | |
283 | if (!type) | |
284 | goto unlock; | |
285 | ||
cdfbabfb | 286 | sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
287 | err = -ENOMEM; |
288 | if (!sk2) | |
289 | goto unlock; | |
290 | ||
291 | sock_init_data(newsock, sk2); | |
2acce6aa | 292 | security_sock_graft(sk2, newsock); |
4c63f83c | 293 | security_sk_clone(sk, sk2); |
03c8efc1 HX |
294 | |
295 | err = type->accept(ask->private, sk2); | |
37766586 HX |
296 | |
297 | nokey = err == -ENOKEY; | |
298 | if (nokey && type->accept_nokey) | |
299 | err = type->accept_nokey(ask->private, sk2); | |
300 | ||
a383292c | 301 | if (err) |
03c8efc1 | 302 | goto unlock; |
03c8efc1 | 303 | |
37766586 | 304 | if (nokey || !ask->refcnt++) |
c840ac6a | 305 | sock_hold(sk); |
a6a48c56 | 306 | ask->nokey_refcnt += nokey; |
03c8efc1 HX |
307 | alg_sk(sk2)->parent = sk; |
308 | alg_sk(sk2)->type = type; | |
6a935170 | 309 | alg_sk(sk2)->nokey_refcnt = nokey; |
03c8efc1 HX |
310 | |
311 | newsock->ops = type->ops; | |
312 | newsock->state = SS_CONNECTED; | |
313 | ||
37766586 HX |
314 | if (nokey) |
315 | newsock->ops = type->ops_nokey; | |
316 | ||
03c8efc1 HX |
317 | err = 0; |
318 | ||
319 | unlock: | |
320 | release_sock(sk); | |
321 | ||
322 | return err; | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(af_alg_accept); | |
325 | ||
cdfbabfb DH |
326 | static int alg_accept(struct socket *sock, struct socket *newsock, int flags, |
327 | bool kern) | |
03c8efc1 | 328 | { |
cdfbabfb | 329 | return af_alg_accept(sock->sk, newsock, kern); |
03c8efc1 HX |
330 | } |
331 | ||
332 | static const struct proto_ops alg_proto_ops = { | |
333 | .family = PF_ALG, | |
334 | .owner = THIS_MODULE, | |
335 | ||
336 | .connect = sock_no_connect, | |
337 | .socketpair = sock_no_socketpair, | |
338 | .getname = sock_no_getname, | |
339 | .ioctl = sock_no_ioctl, | |
340 | .listen = sock_no_listen, | |
341 | .shutdown = sock_no_shutdown, | |
342 | .getsockopt = sock_no_getsockopt, | |
343 | .mmap = sock_no_mmap, | |
344 | .sendpage = sock_no_sendpage, | |
345 | .sendmsg = sock_no_sendmsg, | |
346 | .recvmsg = sock_no_recvmsg, | |
03c8efc1 HX |
347 | |
348 | .bind = alg_bind, | |
349 | .release = af_alg_release, | |
350 | .setsockopt = alg_setsockopt, | |
351 | .accept = alg_accept, | |
352 | }; | |
353 | ||
354 | static void alg_sock_destruct(struct sock *sk) | |
355 | { | |
356 | struct alg_sock *ask = alg_sk(sk); | |
357 | ||
358 | alg_do_release(ask->type, ask->private); | |
359 | } | |
360 | ||
361 | static int alg_create(struct net *net, struct socket *sock, int protocol, | |
362 | int kern) | |
363 | { | |
364 | struct sock *sk; | |
365 | int err; | |
366 | ||
367 | if (sock->type != SOCK_SEQPACKET) | |
368 | return -ESOCKTNOSUPPORT; | |
369 | if (protocol != 0) | |
370 | return -EPROTONOSUPPORT; | |
371 | ||
372 | err = -ENOMEM; | |
11aa9c28 | 373 | sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
374 | if (!sk) |
375 | goto out; | |
376 | ||
377 | sock->ops = &alg_proto_ops; | |
378 | sock_init_data(sock, sk); | |
379 | ||
03c8efc1 HX |
380 | sk->sk_destruct = alg_sock_destruct; |
381 | ||
382 | return 0; | |
383 | out: | |
384 | return err; | |
385 | } | |
386 | ||
387 | static const struct net_proto_family alg_family = { | |
388 | .family = PF_ALG, | |
389 | .create = alg_create, | |
390 | .owner = THIS_MODULE, | |
391 | }; | |
392 | ||
1d10eb2f | 393 | int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) |
03c8efc1 | 394 | { |
1d10eb2f AV |
395 | size_t off; |
396 | ssize_t n; | |
397 | int npages, i; | |
03c8efc1 | 398 | |
1d10eb2f AV |
399 | n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off); |
400 | if (n < 0) | |
401 | return n; | |
03c8efc1 | 402 | |
9399f0c5 | 403 | npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
03c8efc1 | 404 | if (WARN_ON(npages == 0)) |
1d10eb2f | 405 | return -EINVAL; |
66db3739 TS |
406 | /* Add one extra for linking */ |
407 | sg_init_table(sgl->sg, npages + 1); | |
03c8efc1 | 408 | |
1d10eb2f | 409 | for (i = 0, len = n; i < npages; i++) { |
03c8efc1 HX |
410 | int plen = min_t(int, len, PAGE_SIZE - off); |
411 | ||
412 | sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); | |
413 | ||
414 | off = 0; | |
415 | len -= plen; | |
03c8efc1 | 416 | } |
66db3739 TS |
417 | sg_mark_end(sgl->sg + npages - 1); |
418 | sgl->npages = npages; | |
419 | ||
1d10eb2f | 420 | return n; |
03c8efc1 HX |
421 | } |
422 | EXPORT_SYMBOL_GPL(af_alg_make_sg); | |
423 | ||
466e0759 EB |
424 | static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, |
425 | struct af_alg_sgl *sgl_new) | |
66db3739 TS |
426 | { |
427 | sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); | |
428 | sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg); | |
429 | } | |
66db3739 | 430 | |
03c8efc1 HX |
431 | void af_alg_free_sg(struct af_alg_sgl *sgl) |
432 | { | |
433 | int i; | |
434 | ||
66db3739 | 435 | for (i = 0; i < sgl->npages; i++) |
03c8efc1 | 436 | put_page(sgl->pages[i]); |
03c8efc1 HX |
437 | } |
438 | EXPORT_SYMBOL_GPL(af_alg_free_sg); | |
439 | ||
466e0759 | 440 | static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con) |
03c8efc1 HX |
441 | { |
442 | struct cmsghdr *cmsg; | |
443 | ||
f95b414e | 444 | for_each_cmsghdr(cmsg, msg) { |
03c8efc1 HX |
445 | if (!CMSG_OK(msg, cmsg)) |
446 | return -EINVAL; | |
447 | if (cmsg->cmsg_level != SOL_ALG) | |
448 | continue; | |
449 | ||
267c4221 | 450 | switch (cmsg->cmsg_type) { |
03c8efc1 HX |
451 | case ALG_SET_IV: |
452 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv))) | |
453 | return -EINVAL; | |
454 | con->iv = (void *)CMSG_DATA(cmsg); | |
455 | if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen + | |
456 | sizeof(*con->iv))) | |
457 | return -EINVAL; | |
458 | break; | |
459 | ||
460 | case ALG_SET_OP: | |
461 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
462 | return -EINVAL; | |
463 | con->op = *(u32 *)CMSG_DATA(cmsg); | |
464 | break; | |
465 | ||
af8e8073 SM |
466 | case ALG_SET_AEAD_ASSOCLEN: |
467 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
468 | return -EINVAL; | |
469 | con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg); | |
470 | break; | |
471 | ||
03c8efc1 HX |
472 | default: |
473 | return -EINVAL; | |
474 | } | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
03c8efc1 | 479 | |
2d97591e SM |
480 | /** |
481 | * af_alg_alloc_tsgl - allocate the TX SGL | |
482 | * | |
483 | * @sk socket of connection to user space | |
484 | * @return: 0 upon success, < 0 upon error | |
485 | */ | |
466e0759 | 486 | static int af_alg_alloc_tsgl(struct sock *sk) |
2d97591e SM |
487 | { |
488 | struct alg_sock *ask = alg_sk(sk); | |
489 | struct af_alg_ctx *ctx = ask->private; | |
490 | struct af_alg_tsgl *sgl; | |
491 | struct scatterlist *sg = NULL; | |
492 | ||
493 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
494 | if (!list_empty(&ctx->tsgl_list)) | |
495 | sg = sgl->sg; | |
496 | ||
497 | if (!sg || sgl->cur >= MAX_SGL_ENTS) { | |
0ed2dd03 KC |
498 | sgl = sock_kmalloc(sk, |
499 | struct_size(sgl, sg, (MAX_SGL_ENTS + 1)), | |
2d97591e SM |
500 | GFP_KERNEL); |
501 | if (!sgl) | |
502 | return -ENOMEM; | |
503 | ||
504 | sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); | |
505 | sgl->cur = 0; | |
506 | ||
507 | if (sg) | |
508 | sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); | |
509 | ||
510 | list_add_tail(&sgl->list, &ctx->tsgl_list); | |
511 | } | |
512 | ||
513 | return 0; | |
514 | } | |
2d97591e SM |
515 | |
516 | /** | |
517 | * aead_count_tsgl - Count number of TX SG entries | |
518 | * | |
519 | * The counting starts from the beginning of the SGL to @bytes. If | |
520 | * an offset is provided, the counting of the SG entries starts at the offset. | |
521 | * | |
522 | * @sk socket of connection to user space | |
523 | * @bytes Count the number of SG entries holding given number of bytes. | |
524 | * @offset Start the counting of SG entries from the given offset. | |
525 | * @return Number of TX SG entries found given the constraints | |
526 | */ | |
527 | unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset) | |
528 | { | |
7c39edfb EB |
529 | const struct alg_sock *ask = alg_sk(sk); |
530 | const struct af_alg_ctx *ctx = ask->private; | |
531 | const struct af_alg_tsgl *sgl; | |
2d97591e SM |
532 | unsigned int i; |
533 | unsigned int sgl_count = 0; | |
534 | ||
535 | if (!bytes) | |
536 | return 0; | |
537 | ||
7c39edfb EB |
538 | list_for_each_entry(sgl, &ctx->tsgl_list, list) { |
539 | const struct scatterlist *sg = sgl->sg; | |
2d97591e SM |
540 | |
541 | for (i = 0; i < sgl->cur; i++) { | |
542 | size_t bytes_count; | |
543 | ||
544 | /* Skip offset */ | |
545 | if (offset >= sg[i].length) { | |
546 | offset -= sg[i].length; | |
547 | bytes -= sg[i].length; | |
548 | continue; | |
549 | } | |
550 | ||
551 | bytes_count = sg[i].length - offset; | |
552 | ||
553 | offset = 0; | |
554 | sgl_count++; | |
555 | ||
556 | /* If we have seen requested number of bytes, stop */ | |
557 | if (bytes_count >= bytes) | |
558 | return sgl_count; | |
559 | ||
560 | bytes -= bytes_count; | |
561 | } | |
562 | } | |
563 | ||
564 | return sgl_count; | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(af_alg_count_tsgl); | |
567 | ||
568 | /** | |
569 | * aead_pull_tsgl - Release the specified buffers from TX SGL | |
570 | * | |
571 | * If @dst is non-null, reassign the pages to dst. The caller must release | |
572 | * the pages. If @dst_offset is given only reassign the pages to @dst starting | |
573 | * at the @dst_offset (byte). The caller must ensure that @dst is large | |
574 | * enough (e.g. by using af_alg_count_tsgl with the same offset). | |
575 | * | |
576 | * @sk socket of connection to user space | |
577 | * @used Number of bytes to pull from TX SGL | |
578 | * @dst If non-NULL, buffer is reassigned to dst SGL instead of releasing. The | |
579 | * caller must release the buffers in dst. | |
580 | * @dst_offset Reassign the TX SGL from given offset. All buffers before | |
581 | * reaching the offset is released. | |
582 | */ | |
583 | void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, | |
584 | size_t dst_offset) | |
585 | { | |
586 | struct alg_sock *ask = alg_sk(sk); | |
587 | struct af_alg_ctx *ctx = ask->private; | |
588 | struct af_alg_tsgl *sgl; | |
589 | struct scatterlist *sg; | |
e117765a | 590 | unsigned int i, j = 0; |
2d97591e SM |
591 | |
592 | while (!list_empty(&ctx->tsgl_list)) { | |
593 | sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, | |
594 | list); | |
595 | sg = sgl->sg; | |
596 | ||
e117765a | 597 | for (i = 0; i < sgl->cur; i++) { |
2d97591e SM |
598 | size_t plen = min_t(size_t, used, sg[i].length); |
599 | struct page *page = sg_page(sg + i); | |
600 | ||
601 | if (!page) | |
602 | continue; | |
603 | ||
604 | /* | |
605 | * Assumption: caller created af_alg_count_tsgl(len) | |
606 | * SG entries in dst. | |
607 | */ | |
608 | if (dst) { | |
609 | if (dst_offset >= plen) { | |
610 | /* discard page before offset */ | |
611 | dst_offset -= plen; | |
2d97591e SM |
612 | } else { |
613 | /* reassign page to dst after offset */ | |
2d45a7e8 | 614 | get_page(page); |
2d97591e SM |
615 | sg_set_page(dst + j, page, |
616 | plen - dst_offset, | |
617 | sg[i].offset + dst_offset); | |
618 | dst_offset = 0; | |
619 | j++; | |
620 | } | |
621 | } | |
622 | ||
623 | sg[i].length -= plen; | |
624 | sg[i].offset += plen; | |
625 | ||
626 | used -= plen; | |
627 | ctx->used -= plen; | |
628 | ||
629 | if (sg[i].length) | |
630 | return; | |
631 | ||
2d45a7e8 | 632 | put_page(page); |
2d97591e SM |
633 | sg_assign_page(sg + i, NULL); |
634 | } | |
635 | ||
636 | list_del(&sgl->list); | |
91e14842 | 637 | sock_kfree_s(sk, sgl, struct_size(sgl, sg, MAX_SGL_ENTS + 1)); |
2d97591e SM |
638 | } |
639 | ||
640 | if (!ctx->used) | |
641 | ctx->merge = 0; | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); | |
644 | ||
645 | /** | |
646 | * af_alg_free_areq_sgls - Release TX and RX SGLs of the request | |
647 | * | |
648 | * @areq Request holding the TX and RX SGL | |
649 | */ | |
466e0759 | 650 | static void af_alg_free_areq_sgls(struct af_alg_async_req *areq) |
2d97591e SM |
651 | { |
652 | struct sock *sk = areq->sk; | |
653 | struct alg_sock *ask = alg_sk(sk); | |
654 | struct af_alg_ctx *ctx = ask->private; | |
655 | struct af_alg_rsgl *rsgl, *tmp; | |
656 | struct scatterlist *tsgl; | |
657 | struct scatterlist *sg; | |
658 | unsigned int i; | |
659 | ||
660 | list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) { | |
af955bf1 | 661 | atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused); |
2d97591e SM |
662 | af_alg_free_sg(&rsgl->sgl); |
663 | list_del(&rsgl->list); | |
664 | if (rsgl != &areq->first_rsgl) | |
665 | sock_kfree_s(sk, rsgl, sizeof(*rsgl)); | |
666 | } | |
667 | ||
668 | tsgl = areq->tsgl; | |
887207ed EB |
669 | if (tsgl) { |
670 | for_each_sg(tsgl, sg, areq->tsgl_entries, i) { | |
671 | if (!sg_page(sg)) | |
672 | continue; | |
673 | put_page(sg_page(sg)); | |
674 | } | |
2d97591e | 675 | |
2d97591e | 676 | sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl)); |
887207ed | 677 | } |
2d97591e | 678 | } |
2d97591e SM |
679 | |
680 | /** | |
681 | * af_alg_wait_for_wmem - wait for availability of writable memory | |
682 | * | |
683 | * @sk socket of connection to user space | |
684 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
685 | * @return 0 when writable memory is available, < 0 upon error | |
686 | */ | |
466e0759 | 687 | static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags) |
2d97591e SM |
688 | { |
689 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
690 | int err = -ERESTARTSYS; | |
691 | long timeout; | |
692 | ||
693 | if (flags & MSG_DONTWAIT) | |
694 | return -EAGAIN; | |
695 | ||
696 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
697 | ||
698 | add_wait_queue(sk_sleep(sk), &wait); | |
699 | for (;;) { | |
700 | if (signal_pending(current)) | |
701 | break; | |
702 | timeout = MAX_SCHEDULE_TIMEOUT; | |
703 | if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) { | |
704 | err = 0; | |
705 | break; | |
706 | } | |
707 | } | |
708 | remove_wait_queue(sk_sleep(sk), &wait); | |
709 | ||
710 | return err; | |
711 | } | |
2d97591e SM |
712 | |
713 | /** | |
714 | * af_alg_wmem_wakeup - wakeup caller when writable memory is available | |
715 | * | |
716 | * @sk socket of connection to user space | |
717 | */ | |
718 | void af_alg_wmem_wakeup(struct sock *sk) | |
719 | { | |
720 | struct socket_wq *wq; | |
721 | ||
722 | if (!af_alg_writable(sk)) | |
723 | return; | |
724 | ||
725 | rcu_read_lock(); | |
726 | wq = rcu_dereference(sk->sk_wq); | |
727 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
728 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | |
729 | EPOLLRDNORM | | |
730 | EPOLLRDBAND); | |
2d97591e SM |
731 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
732 | rcu_read_unlock(); | |
733 | } | |
734 | EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); | |
735 | ||
736 | /** | |
737 | * af_alg_wait_for_data - wait for availability of TX data | |
738 | * | |
739 | * @sk socket of connection to user space | |
740 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
741 | * @return 0 when writable memory is available, < 0 upon error | |
742 | */ | |
743 | int af_alg_wait_for_data(struct sock *sk, unsigned flags) | |
744 | { | |
745 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
746 | struct alg_sock *ask = alg_sk(sk); | |
747 | struct af_alg_ctx *ctx = ask->private; | |
748 | long timeout; | |
749 | int err = -ERESTARTSYS; | |
750 | ||
751 | if (flags & MSG_DONTWAIT) | |
752 | return -EAGAIN; | |
753 | ||
754 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
755 | ||
756 | add_wait_queue(sk_sleep(sk), &wait); | |
757 | for (;;) { | |
758 | if (signal_pending(current)) | |
759 | break; | |
760 | timeout = MAX_SCHEDULE_TIMEOUT; | |
761 | if (sk_wait_event(sk, &timeout, (ctx->used || !ctx->more), | |
762 | &wait)) { | |
763 | err = 0; | |
764 | break; | |
765 | } | |
766 | } | |
767 | remove_wait_queue(sk_sleep(sk), &wait); | |
768 | ||
769 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
770 | ||
771 | return err; | |
772 | } | |
773 | EXPORT_SYMBOL_GPL(af_alg_wait_for_data); | |
774 | ||
775 | /** | |
776 | * af_alg_data_wakeup - wakeup caller when new data can be sent to kernel | |
777 | * | |
778 | * @sk socket of connection to user space | |
779 | */ | |
466e0759 | 780 | static void af_alg_data_wakeup(struct sock *sk) |
2d97591e SM |
781 | { |
782 | struct alg_sock *ask = alg_sk(sk); | |
783 | struct af_alg_ctx *ctx = ask->private; | |
784 | struct socket_wq *wq; | |
785 | ||
786 | if (!ctx->used) | |
787 | return; | |
788 | ||
789 | rcu_read_lock(); | |
790 | wq = rcu_dereference(sk->sk_wq); | |
791 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
792 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
793 | EPOLLRDNORM | | |
794 | EPOLLRDBAND); | |
2d97591e SM |
795 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
796 | rcu_read_unlock(); | |
797 | } | |
2d97591e SM |
798 | |
799 | /** | |
800 | * af_alg_sendmsg - implementation of sendmsg system call handler | |
801 | * | |
802 | * The sendmsg system call handler obtains the user data and stores it | |
803 | * in ctx->tsgl_list. This implies allocation of the required numbers of | |
804 | * struct af_alg_tsgl. | |
805 | * | |
806 | * In addition, the ctx is filled with the information sent via CMSG. | |
807 | * | |
808 | * @sock socket of connection to user space | |
809 | * @msg message from user space | |
810 | * @size size of message from user space | |
811 | * @ivsize the size of the IV for the cipher operation to verify that the | |
812 | * user-space-provided IV has the right size | |
813 | * @return the number of copied data upon success, < 0 upon error | |
814 | */ | |
815 | int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
816 | unsigned int ivsize) | |
817 | { | |
818 | struct sock *sk = sock->sk; | |
819 | struct alg_sock *ask = alg_sk(sk); | |
820 | struct af_alg_ctx *ctx = ask->private; | |
821 | struct af_alg_tsgl *sgl; | |
822 | struct af_alg_control con = {}; | |
823 | long copied = 0; | |
fcb90d51 LR |
824 | bool enc = false; |
825 | bool init = false; | |
2d97591e SM |
826 | int err = 0; |
827 | ||
828 | if (msg->msg_controllen) { | |
829 | err = af_alg_cmsg_send(msg, &con); | |
830 | if (err) | |
831 | return err; | |
832 | ||
fcb90d51 | 833 | init = true; |
2d97591e SM |
834 | switch (con.op) { |
835 | case ALG_OP_ENCRYPT: | |
fcb90d51 | 836 | enc = true; |
2d97591e SM |
837 | break; |
838 | case ALG_OP_DECRYPT: | |
fcb90d51 | 839 | enc = false; |
2d97591e SM |
840 | break; |
841 | default: | |
842 | return -EINVAL; | |
843 | } | |
844 | ||
845 | if (con.iv && con.iv->ivlen != ivsize) | |
846 | return -EINVAL; | |
847 | } | |
848 | ||
849 | lock_sock(sk); | |
850 | if (!ctx->more && ctx->used) { | |
851 | err = -EINVAL; | |
852 | goto unlock; | |
853 | } | |
854 | ||
855 | if (init) { | |
856 | ctx->enc = enc; | |
857 | if (con.iv) | |
858 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
859 | ||
860 | ctx->aead_assoclen = con.aead_assoclen; | |
861 | } | |
862 | ||
863 | while (size) { | |
864 | struct scatterlist *sg; | |
865 | size_t len = size; | |
866 | size_t plen; | |
867 | ||
868 | /* use the existing memory in an allocated page */ | |
869 | if (ctx->merge) { | |
870 | sgl = list_entry(ctx->tsgl_list.prev, | |
871 | struct af_alg_tsgl, list); | |
872 | sg = sgl->sg + sgl->cur - 1; | |
873 | len = min_t(size_t, len, | |
874 | PAGE_SIZE - sg->offset - sg->length); | |
875 | ||
876 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
877 | sg->offset + sg->length, | |
878 | msg, len); | |
879 | if (err) | |
880 | goto unlock; | |
881 | ||
882 | sg->length += len; | |
883 | ctx->merge = (sg->offset + sg->length) & | |
884 | (PAGE_SIZE - 1); | |
885 | ||
886 | ctx->used += len; | |
887 | copied += len; | |
888 | size -= len; | |
889 | continue; | |
890 | } | |
891 | ||
892 | if (!af_alg_writable(sk)) { | |
893 | err = af_alg_wait_for_wmem(sk, msg->msg_flags); | |
894 | if (err) | |
895 | goto unlock; | |
896 | } | |
897 | ||
898 | /* allocate a new page */ | |
899 | len = min_t(unsigned long, len, af_alg_sndbuf(sk)); | |
900 | ||
901 | err = af_alg_alloc_tsgl(sk); | |
902 | if (err) | |
903 | goto unlock; | |
904 | ||
905 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, | |
906 | list); | |
907 | sg = sgl->sg; | |
908 | if (sgl->cur) | |
909 | sg_unmark_end(sg + sgl->cur - 1); | |
910 | ||
911 | do { | |
912 | unsigned int i = sgl->cur; | |
913 | ||
914 | plen = min_t(size_t, len, PAGE_SIZE); | |
915 | ||
916 | sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); | |
917 | if (!sg_page(sg + i)) { | |
918 | err = -ENOMEM; | |
919 | goto unlock; | |
920 | } | |
921 | ||
922 | err = memcpy_from_msg(page_address(sg_page(sg + i)), | |
923 | msg, plen); | |
924 | if (err) { | |
925 | __free_page(sg_page(sg + i)); | |
926 | sg_assign_page(sg + i, NULL); | |
927 | goto unlock; | |
928 | } | |
929 | ||
930 | sg[i].length = plen; | |
931 | len -= plen; | |
932 | ctx->used += plen; | |
933 | copied += plen; | |
934 | size -= plen; | |
935 | sgl->cur++; | |
936 | } while (len && sgl->cur < MAX_SGL_ENTS); | |
937 | ||
938 | if (!size) | |
939 | sg_mark_end(sg + sgl->cur - 1); | |
940 | ||
941 | ctx->merge = plen & (PAGE_SIZE - 1); | |
942 | } | |
943 | ||
944 | err = 0; | |
945 | ||
946 | ctx->more = msg->msg_flags & MSG_MORE; | |
947 | ||
948 | unlock: | |
949 | af_alg_data_wakeup(sk); | |
950 | release_sock(sk); | |
951 | ||
952 | return copied ?: err; | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(af_alg_sendmsg); | |
955 | ||
956 | /** | |
957 | * af_alg_sendpage - sendpage system call handler | |
958 | * | |
959 | * This is a generic implementation of sendpage to fill ctx->tsgl_list. | |
960 | */ | |
961 | ssize_t af_alg_sendpage(struct socket *sock, struct page *page, | |
962 | int offset, size_t size, int flags) | |
963 | { | |
964 | struct sock *sk = sock->sk; | |
965 | struct alg_sock *ask = alg_sk(sk); | |
966 | struct af_alg_ctx *ctx = ask->private; | |
967 | struct af_alg_tsgl *sgl; | |
968 | int err = -EINVAL; | |
969 | ||
970 | if (flags & MSG_SENDPAGE_NOTLAST) | |
971 | flags |= MSG_MORE; | |
972 | ||
973 | lock_sock(sk); | |
974 | if (!ctx->more && ctx->used) | |
975 | goto unlock; | |
976 | ||
977 | if (!size) | |
978 | goto done; | |
979 | ||
980 | if (!af_alg_writable(sk)) { | |
981 | err = af_alg_wait_for_wmem(sk, flags); | |
982 | if (err) | |
983 | goto unlock; | |
984 | } | |
985 | ||
986 | err = af_alg_alloc_tsgl(sk); | |
987 | if (err) | |
988 | goto unlock; | |
989 | ||
990 | ctx->merge = 0; | |
991 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
992 | ||
993 | if (sgl->cur) | |
994 | sg_unmark_end(sgl->sg + sgl->cur - 1); | |
995 | ||
996 | sg_mark_end(sgl->sg + sgl->cur); | |
997 | ||
998 | get_page(page); | |
999 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
1000 | sgl->cur++; | |
1001 | ctx->used += size; | |
1002 | ||
1003 | done: | |
1004 | ctx->more = flags & MSG_MORE; | |
1005 | ||
1006 | unlock: | |
1007 | af_alg_data_wakeup(sk); | |
1008 | release_sock(sk); | |
1009 | ||
1010 | return err ?: size; | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(af_alg_sendpage); | |
1013 | ||
7d2c3f54 SM |
1014 | /** |
1015 | * af_alg_free_resources - release resources required for crypto request | |
1016 | */ | |
1017 | void af_alg_free_resources(struct af_alg_async_req *areq) | |
1018 | { | |
1019 | struct sock *sk = areq->sk; | |
1020 | ||
1021 | af_alg_free_areq_sgls(areq); | |
1022 | sock_kfree_s(sk, areq, areq->areqlen); | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(af_alg_free_resources); | |
1025 | ||
2d97591e SM |
1026 | /** |
1027 | * af_alg_async_cb - AIO callback handler | |
1028 | * | |
1029 | * This handler cleans up the struct af_alg_async_req upon completion of the | |
1030 | * AIO operation. | |
1031 | * | |
1032 | * The number of bytes to be generated with the AIO operation must be set | |
1033 | * in areq->outlen before the AIO callback handler is invoked. | |
1034 | */ | |
1035 | void af_alg_async_cb(struct crypto_async_request *_req, int err) | |
1036 | { | |
1037 | struct af_alg_async_req *areq = _req->data; | |
1038 | struct sock *sk = areq->sk; | |
1039 | struct kiocb *iocb = areq->iocb; | |
1040 | unsigned int resultlen; | |
1041 | ||
2d97591e SM |
1042 | /* Buffer size written by crypto operation. */ |
1043 | resultlen = areq->outlen; | |
1044 | ||
7d2c3f54 SM |
1045 | af_alg_free_resources(areq); |
1046 | sock_put(sk); | |
2d97591e | 1047 | |
64e7f852 | 1048 | iocb->ki_complete(iocb, err ? err : (int)resultlen, 0); |
2d97591e SM |
1049 | } |
1050 | EXPORT_SYMBOL_GPL(af_alg_async_cb); | |
1051 | ||
a11e1d43 LT |
1052 | /** |
1053 | * af_alg_poll - poll system call handler | |
1054 | */ | |
1055 | __poll_t af_alg_poll(struct file *file, struct socket *sock, | |
1056 | poll_table *wait) | |
2d97591e SM |
1057 | { |
1058 | struct sock *sk = sock->sk; | |
1059 | struct alg_sock *ask = alg_sk(sk); | |
1060 | struct af_alg_ctx *ctx = ask->private; | |
a11e1d43 LT |
1061 | __poll_t mask; |
1062 | ||
89ab066d | 1063 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1064 | mask = 0; |
2d97591e SM |
1065 | |
1066 | if (!ctx->more || ctx->used) | |
a9a08845 | 1067 | mask |= EPOLLIN | EPOLLRDNORM; |
2d97591e SM |
1068 | |
1069 | if (af_alg_writable(sk)) | |
a9a08845 | 1070 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
2d97591e SM |
1071 | |
1072 | return mask; | |
1073 | } | |
a11e1d43 | 1074 | EXPORT_SYMBOL_GPL(af_alg_poll); |
2d97591e SM |
1075 | |
1076 | /** | |
1077 | * af_alg_alloc_areq - allocate struct af_alg_async_req | |
1078 | * | |
1079 | * @sk socket of connection to user space | |
1080 | * @areqlen size of struct af_alg_async_req + crypto_*_reqsize | |
1081 | * @return allocated data structure or ERR_PTR upon error | |
1082 | */ | |
1083 | struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk, | |
1084 | unsigned int areqlen) | |
1085 | { | |
1086 | struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL); | |
1087 | ||
1088 | if (unlikely(!areq)) | |
1089 | return ERR_PTR(-ENOMEM); | |
1090 | ||
1091 | areq->areqlen = areqlen; | |
1092 | areq->sk = sk; | |
1093 | areq->last_rsgl = NULL; | |
1094 | INIT_LIST_HEAD(&areq->rsgl_list); | |
1095 | areq->tsgl = NULL; | |
1096 | areq->tsgl_entries = 0; | |
1097 | ||
1098 | return areq; | |
1099 | } | |
1100 | EXPORT_SYMBOL_GPL(af_alg_alloc_areq); | |
1101 | ||
1102 | /** | |
1103 | * af_alg_get_rsgl - create the RX SGL for the output data from the crypto | |
1104 | * operation | |
1105 | * | |
1106 | * @sk socket of connection to user space | |
1107 | * @msg user space message | |
1108 | * @flags flags used to invoke recvmsg with | |
1109 | * @areq instance of the cryptographic request that will hold the RX SGL | |
1110 | * @maxsize maximum number of bytes to be pulled from user space | |
1111 | * @outlen number of bytes in the RX SGL | |
1112 | * @return 0 on success, < 0 upon error | |
1113 | */ | |
1114 | int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, | |
1115 | struct af_alg_async_req *areq, size_t maxsize, | |
1116 | size_t *outlen) | |
1117 | { | |
1118 | struct alg_sock *ask = alg_sk(sk); | |
1119 | struct af_alg_ctx *ctx = ask->private; | |
1120 | size_t len = 0; | |
1121 | ||
1122 | while (maxsize > len && msg_data_left(msg)) { | |
1123 | struct af_alg_rsgl *rsgl; | |
1124 | size_t seglen; | |
1125 | int err; | |
1126 | ||
1127 | /* limit the amount of readable buffers */ | |
1128 | if (!af_alg_readable(sk)) | |
1129 | break; | |
1130 | ||
2d97591e SM |
1131 | seglen = min_t(size_t, (maxsize - len), |
1132 | msg_data_left(msg)); | |
1133 | ||
1134 | if (list_empty(&areq->rsgl_list)) { | |
1135 | rsgl = &areq->first_rsgl; | |
1136 | } else { | |
1137 | rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL); | |
1138 | if (unlikely(!rsgl)) | |
1139 | return -ENOMEM; | |
1140 | } | |
1141 | ||
1142 | rsgl->sgl.npages = 0; | |
1143 | list_add_tail(&rsgl->list, &areq->rsgl_list); | |
1144 | ||
1145 | /* make one iovec available as scatterlist */ | |
1146 | err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); | |
2546da99 SM |
1147 | if (err < 0) { |
1148 | rsgl->sg_num_bytes = 0; | |
2d97591e | 1149 | return err; |
2546da99 | 1150 | } |
2d97591e SM |
1151 | |
1152 | /* chain the new scatterlist with previous one */ | |
1153 | if (areq->last_rsgl) | |
1154 | af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); | |
1155 | ||
1156 | areq->last_rsgl = rsgl; | |
1157 | len += err; | |
af955bf1 | 1158 | atomic_add(err, &ctx->rcvused); |
2d97591e SM |
1159 | rsgl->sg_num_bytes = err; |
1160 | iov_iter_advance(&msg->msg_iter, err); | |
1161 | } | |
1162 | ||
1163 | *outlen = len; | |
1164 | return 0; | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(af_alg_get_rsgl); | |
1167 | ||
03c8efc1 HX |
1168 | static int __init af_alg_init(void) |
1169 | { | |
1170 | int err = proto_register(&alg_proto, 0); | |
1171 | ||
1172 | if (err) | |
1173 | goto out; | |
1174 | ||
1175 | err = sock_register(&alg_family); | |
1176 | if (err != 0) | |
1177 | goto out_unregister_proto; | |
1178 | ||
1179 | out: | |
1180 | return err; | |
1181 | ||
1182 | out_unregister_proto: | |
1183 | proto_unregister(&alg_proto); | |
1184 | goto out; | |
1185 | } | |
1186 | ||
1187 | static void __exit af_alg_exit(void) | |
1188 | { | |
1189 | sock_unregister(PF_ALG); | |
1190 | proto_unregister(&alg_proto); | |
1191 | } | |
1192 | ||
1193 | module_init(af_alg_init); | |
1194 | module_exit(af_alg_exit); | |
1195 | MODULE_LICENSE("GPL"); | |
1196 | MODULE_ALIAS_NETPROTO(AF_ALG); |