Commit | Line | Data |
---|---|---|
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); | |
34c86f4c | 131 | unsigned int nokey = atomic_read(&ask->nokey_refcnt); |
c840ac6a HX |
132 | |
133 | sk = ask->parent; | |
134 | ask = alg_sk(sk); | |
135 | ||
34c86f4c HX |
136 | if (nokey) |
137 | atomic_dec(&ask->nokey_refcnt); | |
c840ac6a | 138 | |
34c86f4c | 139 | if (atomic_dec_and_test(&ask->refcnt)) |
c840ac6a HX |
140 | sock_put(sk); |
141 | } | |
142 | EXPORT_SYMBOL_GPL(af_alg_release_parent); | |
143 | ||
03c8efc1 HX |
144 | static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
145 | { | |
bb30b884 | 146 | const u32 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY; |
03c8efc1 HX |
147 | struct sock *sk = sock->sk; |
148 | struct alg_sock *ask = alg_sk(sk); | |
149 | struct sockaddr_alg *sa = (void *)uaddr; | |
150 | const struct af_alg_type *type; | |
151 | void *private; | |
c840ac6a | 152 | int err; |
03c8efc1 HX |
153 | |
154 | if (sock->state == SS_CONNECTED) | |
155 | return -EINVAL; | |
156 | ||
3f69cc60 | 157 | if (addr_len < sizeof(*sa)) |
03c8efc1 HX |
158 | return -EINVAL; |
159 | ||
a466856e ED |
160 | /* If caller uses non-allowed flag, return error. */ |
161 | if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed)) | |
162 | return -EINVAL; | |
163 | ||
03c8efc1 | 164 | sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
3f69cc60 | 165 | sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0; |
03c8efc1 HX |
166 | |
167 | type = alg_get_type(sa->salg_type); | |
45586c70 | 168 | if (PTR_ERR(type) == -ENOENT) { |
03c8efc1 HX |
169 | request_module("algif-%s", sa->salg_type); |
170 | type = alg_get_type(sa->salg_type); | |
171 | } | |
172 | ||
173 | if (IS_ERR(type)) | |
174 | return PTR_ERR(type); | |
175 | ||
bb30b884 | 176 | private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
03c8efc1 HX |
177 | if (IS_ERR(private)) { |
178 | module_put(type->owner); | |
179 | return PTR_ERR(private); | |
180 | } | |
181 | ||
c840ac6a | 182 | err = -EBUSY; |
03c8efc1 | 183 | lock_sock(sk); |
34c86f4c | 184 | if (atomic_read(&ask->refcnt)) |
c840ac6a | 185 | goto unlock; |
03c8efc1 HX |
186 | |
187 | swap(ask->type, type); | |
188 | swap(ask->private, private); | |
189 | ||
c840ac6a HX |
190 | err = 0; |
191 | ||
192 | unlock: | |
03c8efc1 HX |
193 | release_sock(sk); |
194 | ||
195 | alg_do_release(type, private); | |
196 | ||
c840ac6a | 197 | return err; |
03c8efc1 HX |
198 | } |
199 | ||
200 | static int alg_setkey(struct sock *sk, char __user *ukey, | |
201 | unsigned int keylen) | |
202 | { | |
203 | struct alg_sock *ask = alg_sk(sk); | |
204 | const struct af_alg_type *type = ask->type; | |
205 | u8 *key; | |
206 | int err; | |
207 | ||
208 | key = sock_kmalloc(sk, keylen, GFP_KERNEL); | |
209 | if (!key) | |
210 | return -ENOMEM; | |
211 | ||
212 | err = -EFAULT; | |
213 | if (copy_from_user(key, ukey, keylen)) | |
214 | goto out; | |
215 | ||
216 | err = type->setkey(ask->private, key, keylen); | |
217 | ||
218 | out: | |
ad202c8c | 219 | sock_kzfree_s(sk, key, keylen); |
03c8efc1 HX |
220 | |
221 | return err; | |
222 | } | |
223 | ||
224 | static int alg_setsockopt(struct socket *sock, int level, int optname, | |
225 | char __user *optval, unsigned int optlen) | |
226 | { | |
227 | struct sock *sk = sock->sk; | |
228 | struct alg_sock *ask = alg_sk(sk); | |
229 | const struct af_alg_type *type; | |
c840ac6a | 230 | int err = -EBUSY; |
03c8efc1 HX |
231 | |
232 | lock_sock(sk); | |
34c86f4c | 233 | if (atomic_read(&ask->refcnt) != atomic_read(&ask->nokey_refcnt)) |
c840ac6a HX |
234 | goto unlock; |
235 | ||
03c8efc1 HX |
236 | type = ask->type; |
237 | ||
c840ac6a | 238 | err = -ENOPROTOOPT; |
03c8efc1 HX |
239 | if (level != SOL_ALG || !type) |
240 | goto unlock; | |
241 | ||
242 | switch (optname) { | |
243 | case ALG_SET_KEY: | |
244 | if (sock->state == SS_CONNECTED) | |
245 | goto unlock; | |
246 | if (!type->setkey) | |
247 | goto unlock; | |
248 | ||
249 | err = alg_setkey(sk, optval, optlen); | |
25fb8638 SM |
250 | break; |
251 | case ALG_SET_AEAD_AUTHSIZE: | |
252 | if (sock->state == SS_CONNECTED) | |
253 | goto unlock; | |
254 | if (!type->setauthsize) | |
255 | goto unlock; | |
256 | err = type->setauthsize(ask->private, optlen); | |
03c8efc1 HX |
257 | } |
258 | ||
259 | unlock: | |
260 | release_sock(sk); | |
261 | ||
262 | return err; | |
263 | } | |
264 | ||
cdfbabfb | 265 | int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern) |
03c8efc1 HX |
266 | { |
267 | struct alg_sock *ask = alg_sk(sk); | |
268 | const struct af_alg_type *type; | |
269 | struct sock *sk2; | |
6a935170 | 270 | unsigned int nokey; |
03c8efc1 HX |
271 | int err; |
272 | ||
273 | lock_sock(sk); | |
274 | type = ask->type; | |
275 | ||
276 | err = -EINVAL; | |
277 | if (!type) | |
278 | goto unlock; | |
279 | ||
cdfbabfb | 280 | sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
281 | err = -ENOMEM; |
282 | if (!sk2) | |
283 | goto unlock; | |
284 | ||
285 | sock_init_data(newsock, sk2); | |
2acce6aa | 286 | security_sock_graft(sk2, newsock); |
4c63f83c | 287 | security_sk_clone(sk, sk2); |
03c8efc1 HX |
288 | |
289 | err = type->accept(ask->private, sk2); | |
37766586 HX |
290 | |
291 | nokey = err == -ENOKEY; | |
292 | if (nokey && type->accept_nokey) | |
293 | err = type->accept_nokey(ask->private, sk2); | |
294 | ||
a383292c | 295 | if (err) |
03c8efc1 | 296 | goto unlock; |
03c8efc1 | 297 | |
34c86f4c | 298 | if (atomic_inc_return_relaxed(&ask->refcnt) == 1) |
c840ac6a | 299 | sock_hold(sk); |
34c86f4c HX |
300 | if (nokey) { |
301 | atomic_inc(&ask->nokey_refcnt); | |
302 | atomic_set(&alg_sk(sk2)->nokey_refcnt, 1); | |
303 | } | |
03c8efc1 HX |
304 | alg_sk(sk2)->parent = sk; |
305 | alg_sk(sk2)->type = type; | |
306 | ||
307 | newsock->ops = type->ops; | |
308 | newsock->state = SS_CONNECTED; | |
309 | ||
37766586 HX |
310 | if (nokey) |
311 | newsock->ops = type->ops_nokey; | |
312 | ||
03c8efc1 HX |
313 | err = 0; |
314 | ||
315 | unlock: | |
316 | release_sock(sk); | |
317 | ||
318 | return err; | |
319 | } | |
320 | EXPORT_SYMBOL_GPL(af_alg_accept); | |
321 | ||
cdfbabfb DH |
322 | static int alg_accept(struct socket *sock, struct socket *newsock, int flags, |
323 | bool kern) | |
03c8efc1 | 324 | { |
cdfbabfb | 325 | return af_alg_accept(sock->sk, newsock, kern); |
03c8efc1 HX |
326 | } |
327 | ||
328 | static const struct proto_ops alg_proto_ops = { | |
329 | .family = PF_ALG, | |
330 | .owner = THIS_MODULE, | |
331 | ||
332 | .connect = sock_no_connect, | |
333 | .socketpair = sock_no_socketpair, | |
334 | .getname = sock_no_getname, | |
335 | .ioctl = sock_no_ioctl, | |
336 | .listen = sock_no_listen, | |
337 | .shutdown = sock_no_shutdown, | |
338 | .getsockopt = sock_no_getsockopt, | |
339 | .mmap = sock_no_mmap, | |
340 | .sendpage = sock_no_sendpage, | |
341 | .sendmsg = sock_no_sendmsg, | |
342 | .recvmsg = sock_no_recvmsg, | |
03c8efc1 HX |
343 | |
344 | .bind = alg_bind, | |
345 | .release = af_alg_release, | |
346 | .setsockopt = alg_setsockopt, | |
347 | .accept = alg_accept, | |
348 | }; | |
349 | ||
350 | static void alg_sock_destruct(struct sock *sk) | |
351 | { | |
352 | struct alg_sock *ask = alg_sk(sk); | |
353 | ||
354 | alg_do_release(ask->type, ask->private); | |
355 | } | |
356 | ||
357 | static int alg_create(struct net *net, struct socket *sock, int protocol, | |
358 | int kern) | |
359 | { | |
360 | struct sock *sk; | |
361 | int err; | |
362 | ||
363 | if (sock->type != SOCK_SEQPACKET) | |
364 | return -ESOCKTNOSUPPORT; | |
365 | if (protocol != 0) | |
366 | return -EPROTONOSUPPORT; | |
367 | ||
368 | err = -ENOMEM; | |
11aa9c28 | 369 | sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern); |
03c8efc1 HX |
370 | if (!sk) |
371 | goto out; | |
372 | ||
373 | sock->ops = &alg_proto_ops; | |
374 | sock_init_data(sock, sk); | |
375 | ||
03c8efc1 HX |
376 | sk->sk_destruct = alg_sock_destruct; |
377 | ||
378 | return 0; | |
379 | out: | |
380 | return err; | |
381 | } | |
382 | ||
383 | static const struct net_proto_family alg_family = { | |
384 | .family = PF_ALG, | |
385 | .create = alg_create, | |
386 | .owner = THIS_MODULE, | |
387 | }; | |
388 | ||
1d10eb2f | 389 | int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) |
03c8efc1 | 390 | { |
1d10eb2f AV |
391 | size_t off; |
392 | ssize_t n; | |
393 | int npages, i; | |
03c8efc1 | 394 | |
1d10eb2f AV |
395 | n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off); |
396 | if (n < 0) | |
397 | return n; | |
03c8efc1 | 398 | |
9399f0c5 | 399 | npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT; |
03c8efc1 | 400 | if (WARN_ON(npages == 0)) |
1d10eb2f | 401 | return -EINVAL; |
66db3739 TS |
402 | /* Add one extra for linking */ |
403 | sg_init_table(sgl->sg, npages + 1); | |
03c8efc1 | 404 | |
1d10eb2f | 405 | for (i = 0, len = n; i < npages; i++) { |
03c8efc1 HX |
406 | int plen = min_t(int, len, PAGE_SIZE - off); |
407 | ||
408 | sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); | |
409 | ||
410 | off = 0; | |
411 | len -= plen; | |
03c8efc1 | 412 | } |
66db3739 TS |
413 | sg_mark_end(sgl->sg + npages - 1); |
414 | sgl->npages = npages; | |
415 | ||
1d10eb2f | 416 | return n; |
03c8efc1 HX |
417 | } |
418 | EXPORT_SYMBOL_GPL(af_alg_make_sg); | |
419 | ||
466e0759 EB |
420 | static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, |
421 | struct af_alg_sgl *sgl_new) | |
66db3739 TS |
422 | { |
423 | sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); | |
424 | sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg); | |
425 | } | |
66db3739 | 426 | |
03c8efc1 HX |
427 | void af_alg_free_sg(struct af_alg_sgl *sgl) |
428 | { | |
429 | int i; | |
430 | ||
66db3739 | 431 | for (i = 0; i < sgl->npages; i++) |
03c8efc1 | 432 | put_page(sgl->pages[i]); |
03c8efc1 HX |
433 | } |
434 | EXPORT_SYMBOL_GPL(af_alg_free_sg); | |
435 | ||
466e0759 | 436 | static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con) |
03c8efc1 HX |
437 | { |
438 | struct cmsghdr *cmsg; | |
439 | ||
f95b414e | 440 | for_each_cmsghdr(cmsg, msg) { |
03c8efc1 HX |
441 | if (!CMSG_OK(msg, cmsg)) |
442 | return -EINVAL; | |
443 | if (cmsg->cmsg_level != SOL_ALG) | |
444 | continue; | |
445 | ||
267c4221 | 446 | switch (cmsg->cmsg_type) { |
03c8efc1 HX |
447 | case ALG_SET_IV: |
448 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv))) | |
449 | return -EINVAL; | |
450 | con->iv = (void *)CMSG_DATA(cmsg); | |
451 | if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen + | |
452 | sizeof(*con->iv))) | |
453 | return -EINVAL; | |
454 | break; | |
455 | ||
456 | case ALG_SET_OP: | |
457 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
458 | return -EINVAL; | |
459 | con->op = *(u32 *)CMSG_DATA(cmsg); | |
460 | break; | |
461 | ||
af8e8073 SM |
462 | case ALG_SET_AEAD_ASSOCLEN: |
463 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) | |
464 | return -EINVAL; | |
465 | con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg); | |
466 | break; | |
467 | ||
03c8efc1 HX |
468 | default: |
469 | return -EINVAL; | |
470 | } | |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
03c8efc1 | 475 | |
2d97591e SM |
476 | /** |
477 | * af_alg_alloc_tsgl - allocate the TX SGL | |
478 | * | |
479 | * @sk socket of connection to user space | |
480 | * @return: 0 upon success, < 0 upon error | |
481 | */ | |
466e0759 | 482 | static int af_alg_alloc_tsgl(struct sock *sk) |
2d97591e SM |
483 | { |
484 | struct alg_sock *ask = alg_sk(sk); | |
485 | struct af_alg_ctx *ctx = ask->private; | |
486 | struct af_alg_tsgl *sgl; | |
487 | struct scatterlist *sg = NULL; | |
488 | ||
489 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
490 | if (!list_empty(&ctx->tsgl_list)) | |
491 | sg = sgl->sg; | |
492 | ||
493 | if (!sg || sgl->cur >= MAX_SGL_ENTS) { | |
0ed2dd03 KC |
494 | sgl = sock_kmalloc(sk, |
495 | struct_size(sgl, sg, (MAX_SGL_ENTS + 1)), | |
2d97591e SM |
496 | GFP_KERNEL); |
497 | if (!sgl) | |
498 | return -ENOMEM; | |
499 | ||
500 | sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); | |
501 | sgl->cur = 0; | |
502 | ||
503 | if (sg) | |
504 | sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); | |
505 | ||
506 | list_add_tail(&sgl->list, &ctx->tsgl_list); | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
2d97591e SM |
511 | |
512 | /** | |
513 | * aead_count_tsgl - Count number of TX SG entries | |
514 | * | |
515 | * The counting starts from the beginning of the SGL to @bytes. If | |
516 | * an offset is provided, the counting of the SG entries starts at the offset. | |
517 | * | |
518 | * @sk socket of connection to user space | |
519 | * @bytes Count the number of SG entries holding given number of bytes. | |
520 | * @offset Start the counting of SG entries from the given offset. | |
521 | * @return Number of TX SG entries found given the constraints | |
522 | */ | |
523 | unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset) | |
524 | { | |
7c39edfb EB |
525 | const struct alg_sock *ask = alg_sk(sk); |
526 | const struct af_alg_ctx *ctx = ask->private; | |
527 | const struct af_alg_tsgl *sgl; | |
2d97591e SM |
528 | unsigned int i; |
529 | unsigned int sgl_count = 0; | |
530 | ||
531 | if (!bytes) | |
532 | return 0; | |
533 | ||
7c39edfb EB |
534 | list_for_each_entry(sgl, &ctx->tsgl_list, list) { |
535 | const struct scatterlist *sg = sgl->sg; | |
2d97591e SM |
536 | |
537 | for (i = 0; i < sgl->cur; i++) { | |
538 | size_t bytes_count; | |
539 | ||
540 | /* Skip offset */ | |
541 | if (offset >= sg[i].length) { | |
542 | offset -= sg[i].length; | |
543 | bytes -= sg[i].length; | |
544 | continue; | |
545 | } | |
546 | ||
547 | bytes_count = sg[i].length - offset; | |
548 | ||
549 | offset = 0; | |
550 | sgl_count++; | |
551 | ||
552 | /* If we have seen requested number of bytes, stop */ | |
553 | if (bytes_count >= bytes) | |
554 | return sgl_count; | |
555 | ||
556 | bytes -= bytes_count; | |
557 | } | |
558 | } | |
559 | ||
560 | return sgl_count; | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(af_alg_count_tsgl); | |
563 | ||
564 | /** | |
565 | * aead_pull_tsgl - Release the specified buffers from TX SGL | |
566 | * | |
567 | * If @dst is non-null, reassign the pages to dst. The caller must release | |
568 | * the pages. If @dst_offset is given only reassign the pages to @dst starting | |
569 | * at the @dst_offset (byte). The caller must ensure that @dst is large | |
570 | * enough (e.g. by using af_alg_count_tsgl with the same offset). | |
571 | * | |
572 | * @sk socket of connection to user space | |
573 | * @used Number of bytes to pull from TX SGL | |
574 | * @dst If non-NULL, buffer is reassigned to dst SGL instead of releasing. The | |
575 | * caller must release the buffers in dst. | |
576 | * @dst_offset Reassign the TX SGL from given offset. All buffers before | |
577 | * reaching the offset is released. | |
578 | */ | |
579 | void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, | |
580 | size_t dst_offset) | |
581 | { | |
582 | struct alg_sock *ask = alg_sk(sk); | |
583 | struct af_alg_ctx *ctx = ask->private; | |
584 | struct af_alg_tsgl *sgl; | |
585 | struct scatterlist *sg; | |
e117765a | 586 | unsigned int i, j = 0; |
2d97591e SM |
587 | |
588 | while (!list_empty(&ctx->tsgl_list)) { | |
589 | sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, | |
590 | list); | |
591 | sg = sgl->sg; | |
592 | ||
e117765a | 593 | for (i = 0; i < sgl->cur; i++) { |
2d97591e SM |
594 | size_t plen = min_t(size_t, used, sg[i].length); |
595 | struct page *page = sg_page(sg + i); | |
596 | ||
597 | if (!page) | |
598 | continue; | |
599 | ||
600 | /* | |
601 | * Assumption: caller created af_alg_count_tsgl(len) | |
602 | * SG entries in dst. | |
603 | */ | |
604 | if (dst) { | |
605 | if (dst_offset >= plen) { | |
606 | /* discard page before offset */ | |
607 | dst_offset -= plen; | |
2d97591e SM |
608 | } else { |
609 | /* reassign page to dst after offset */ | |
2d45a7e8 | 610 | get_page(page); |
2d97591e SM |
611 | sg_set_page(dst + j, page, |
612 | plen - dst_offset, | |
613 | sg[i].offset + dst_offset); | |
614 | dst_offset = 0; | |
615 | j++; | |
616 | } | |
617 | } | |
618 | ||
619 | sg[i].length -= plen; | |
620 | sg[i].offset += plen; | |
621 | ||
622 | used -= plen; | |
623 | ctx->used -= plen; | |
624 | ||
625 | if (sg[i].length) | |
626 | return; | |
627 | ||
2d45a7e8 | 628 | put_page(page); |
2d97591e SM |
629 | sg_assign_page(sg + i, NULL); |
630 | } | |
631 | ||
632 | list_del(&sgl->list); | |
91e14842 | 633 | sock_kfree_s(sk, sgl, struct_size(sgl, sg, MAX_SGL_ENTS + 1)); |
2d97591e SM |
634 | } |
635 | ||
636 | if (!ctx->used) | |
637 | ctx->merge = 0; | |
f3c802a1 | 638 | ctx->init = ctx->more; |
2d97591e SM |
639 | } |
640 | EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); | |
641 | ||
642 | /** | |
643 | * af_alg_free_areq_sgls - Release TX and RX SGLs of the request | |
644 | * | |
645 | * @areq Request holding the TX and RX SGL | |
646 | */ | |
466e0759 | 647 | static void af_alg_free_areq_sgls(struct af_alg_async_req *areq) |
2d97591e SM |
648 | { |
649 | struct sock *sk = areq->sk; | |
650 | struct alg_sock *ask = alg_sk(sk); | |
651 | struct af_alg_ctx *ctx = ask->private; | |
652 | struct af_alg_rsgl *rsgl, *tmp; | |
653 | struct scatterlist *tsgl; | |
654 | struct scatterlist *sg; | |
655 | unsigned int i; | |
656 | ||
657 | list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) { | |
af955bf1 | 658 | atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused); |
2d97591e SM |
659 | af_alg_free_sg(&rsgl->sgl); |
660 | list_del(&rsgl->list); | |
661 | if (rsgl != &areq->first_rsgl) | |
662 | sock_kfree_s(sk, rsgl, sizeof(*rsgl)); | |
663 | } | |
664 | ||
665 | tsgl = areq->tsgl; | |
887207ed EB |
666 | if (tsgl) { |
667 | for_each_sg(tsgl, sg, areq->tsgl_entries, i) { | |
668 | if (!sg_page(sg)) | |
669 | continue; | |
670 | put_page(sg_page(sg)); | |
671 | } | |
2d97591e | 672 | |
2d97591e | 673 | sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl)); |
887207ed | 674 | } |
2d97591e | 675 | } |
2d97591e SM |
676 | |
677 | /** | |
678 | * af_alg_wait_for_wmem - wait for availability of writable memory | |
679 | * | |
680 | * @sk socket of connection to user space | |
681 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
682 | * @return 0 when writable memory is available, < 0 upon error | |
683 | */ | |
466e0759 | 684 | static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags) |
2d97591e SM |
685 | { |
686 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
687 | int err = -ERESTARTSYS; | |
688 | long timeout; | |
689 | ||
690 | if (flags & MSG_DONTWAIT) | |
691 | return -EAGAIN; | |
692 | ||
693 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
694 | ||
695 | add_wait_queue(sk_sleep(sk), &wait); | |
696 | for (;;) { | |
697 | if (signal_pending(current)) | |
698 | break; | |
699 | timeout = MAX_SCHEDULE_TIMEOUT; | |
700 | if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) { | |
701 | err = 0; | |
702 | break; | |
703 | } | |
704 | } | |
705 | remove_wait_queue(sk_sleep(sk), &wait); | |
706 | ||
707 | return err; | |
708 | } | |
2d97591e SM |
709 | |
710 | /** | |
711 | * af_alg_wmem_wakeup - wakeup caller when writable memory is available | |
712 | * | |
713 | * @sk socket of connection to user space | |
714 | */ | |
715 | void af_alg_wmem_wakeup(struct sock *sk) | |
716 | { | |
717 | struct socket_wq *wq; | |
718 | ||
719 | if (!af_alg_writable(sk)) | |
720 | return; | |
721 | ||
722 | rcu_read_lock(); | |
723 | wq = rcu_dereference(sk->sk_wq); | |
724 | if (skwq_has_sleeper(wq)) | |
a9a08845 LT |
725 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | |
726 | EPOLLRDNORM | | |
727 | EPOLLRDBAND); | |
2d97591e SM |
728 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
729 | rcu_read_unlock(); | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); | |
732 | ||
733 | /** | |
734 | * af_alg_wait_for_data - wait for availability of TX data | |
735 | * | |
736 | * @sk socket of connection to user space | |
737 | * @flags If MSG_DONTWAIT is set, then only report if function would sleep | |
f3c802a1 | 738 | * @min Set to minimum request size if partial requests are allowed. |
2d97591e SM |
739 | * @return 0 when writable memory is available, < 0 upon error |
740 | */ | |
f3c802a1 | 741 | int af_alg_wait_for_data(struct sock *sk, unsigned flags, unsigned min) |
2d97591e SM |
742 | { |
743 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
744 | struct alg_sock *ask = alg_sk(sk); | |
745 | struct af_alg_ctx *ctx = ask->private; | |
746 | long timeout; | |
747 | int err = -ERESTARTSYS; | |
748 | ||
749 | if (flags & MSG_DONTWAIT) | |
750 | return -EAGAIN; | |
751 | ||
752 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); | |
753 | ||
754 | add_wait_queue(sk_sleep(sk), &wait); | |
755 | for (;;) { | |
756 | if (signal_pending(current)) | |
757 | break; | |
758 | timeout = MAX_SCHEDULE_TIMEOUT; | |
f3c802a1 HX |
759 | if (sk_wait_event(sk, &timeout, |
760 | ctx->init && (!ctx->more || | |
761 | (min && ctx->used >= min)), | |
2d97591e SM |
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); | |
f3c802a1 | 850 | if (ctx->init && (init || !ctx->more)) { |
2d97591e SM |
851 | err = -EINVAL; |
852 | goto unlock; | |
853 | } | |
662bb52f | 854 | ctx->init = true; |
2d97591e SM |
855 | |
856 | if (init) { | |
857 | ctx->enc = enc; | |
858 | if (con.iv) | |
859 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
860 | ||
861 | ctx->aead_assoclen = con.aead_assoclen; | |
862 | } | |
863 | ||
864 | while (size) { | |
865 | struct scatterlist *sg; | |
866 | size_t len = size; | |
867 | size_t plen; | |
868 | ||
869 | /* use the existing memory in an allocated page */ | |
870 | if (ctx->merge) { | |
871 | sgl = list_entry(ctx->tsgl_list.prev, | |
872 | struct af_alg_tsgl, list); | |
873 | sg = sgl->sg + sgl->cur - 1; | |
874 | len = min_t(size_t, len, | |
875 | PAGE_SIZE - sg->offset - sg->length); | |
876 | ||
877 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
878 | sg->offset + sg->length, | |
879 | msg, len); | |
880 | if (err) | |
881 | goto unlock; | |
882 | ||
883 | sg->length += len; | |
884 | ctx->merge = (sg->offset + sg->length) & | |
885 | (PAGE_SIZE - 1); | |
886 | ||
887 | ctx->used += len; | |
888 | copied += len; | |
889 | size -= len; | |
890 | continue; | |
891 | } | |
892 | ||
893 | if (!af_alg_writable(sk)) { | |
894 | err = af_alg_wait_for_wmem(sk, msg->msg_flags); | |
895 | if (err) | |
896 | goto unlock; | |
897 | } | |
898 | ||
899 | /* allocate a new page */ | |
900 | len = min_t(unsigned long, len, af_alg_sndbuf(sk)); | |
901 | ||
902 | err = af_alg_alloc_tsgl(sk); | |
903 | if (err) | |
904 | goto unlock; | |
905 | ||
906 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, | |
907 | list); | |
908 | sg = sgl->sg; | |
909 | if (sgl->cur) | |
910 | sg_unmark_end(sg + sgl->cur - 1); | |
911 | ||
912 | do { | |
913 | unsigned int i = sgl->cur; | |
914 | ||
915 | plen = min_t(size_t, len, PAGE_SIZE); | |
916 | ||
917 | sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); | |
918 | if (!sg_page(sg + i)) { | |
919 | err = -ENOMEM; | |
920 | goto unlock; | |
921 | } | |
922 | ||
923 | err = memcpy_from_msg(page_address(sg_page(sg + i)), | |
924 | msg, plen); | |
925 | if (err) { | |
926 | __free_page(sg_page(sg + i)); | |
927 | sg_assign_page(sg + i, NULL); | |
928 | goto unlock; | |
929 | } | |
930 | ||
931 | sg[i].length = plen; | |
932 | len -= plen; | |
933 | ctx->used += plen; | |
934 | copied += plen; | |
935 | size -= plen; | |
936 | sgl->cur++; | |
937 | } while (len && sgl->cur < MAX_SGL_ENTS); | |
938 | ||
939 | if (!size) | |
940 | sg_mark_end(sg + sgl->cur - 1); | |
941 | ||
942 | ctx->merge = plen & (PAGE_SIZE - 1); | |
943 | } | |
944 | ||
945 | err = 0; | |
946 | ||
947 | ctx->more = msg->msg_flags & MSG_MORE; | |
948 | ||
949 | unlock: | |
950 | af_alg_data_wakeup(sk); | |
951 | release_sock(sk); | |
952 | ||
953 | return copied ?: err; | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(af_alg_sendmsg); | |
956 | ||
957 | /** | |
958 | * af_alg_sendpage - sendpage system call handler | |
959 | * | |
960 | * This is a generic implementation of sendpage to fill ctx->tsgl_list. | |
961 | */ | |
962 | ssize_t af_alg_sendpage(struct socket *sock, struct page *page, | |
963 | int offset, size_t size, int flags) | |
964 | { | |
965 | struct sock *sk = sock->sk; | |
966 | struct alg_sock *ask = alg_sk(sk); | |
967 | struct af_alg_ctx *ctx = ask->private; | |
968 | struct af_alg_tsgl *sgl; | |
969 | int err = -EINVAL; | |
970 | ||
971 | if (flags & MSG_SENDPAGE_NOTLAST) | |
972 | flags |= MSG_MORE; | |
973 | ||
974 | lock_sock(sk); | |
975 | if (!ctx->more && ctx->used) | |
976 | goto unlock; | |
977 | ||
978 | if (!size) | |
979 | goto done; | |
980 | ||
981 | if (!af_alg_writable(sk)) { | |
982 | err = af_alg_wait_for_wmem(sk, flags); | |
983 | if (err) | |
984 | goto unlock; | |
985 | } | |
986 | ||
987 | err = af_alg_alloc_tsgl(sk); | |
988 | if (err) | |
989 | goto unlock; | |
990 | ||
991 | ctx->merge = 0; | |
992 | sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); | |
993 | ||
994 | if (sgl->cur) | |
995 | sg_unmark_end(sgl->sg + sgl->cur - 1); | |
996 | ||
997 | sg_mark_end(sgl->sg + sgl->cur); | |
998 | ||
999 | get_page(page); | |
1000 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
1001 | sgl->cur++; | |
1002 | ctx->used += size; | |
1003 | ||
1004 | done: | |
1005 | ctx->more = flags & MSG_MORE; | |
1006 | ||
1007 | unlock: | |
1008 | af_alg_data_wakeup(sk); | |
1009 | release_sock(sk); | |
1010 | ||
1011 | return err ?: size; | |
1012 | } | |
1013 | EXPORT_SYMBOL_GPL(af_alg_sendpage); | |
1014 | ||
7d2c3f54 SM |
1015 | /** |
1016 | * af_alg_free_resources - release resources required for crypto request | |
1017 | */ | |
1018 | void af_alg_free_resources(struct af_alg_async_req *areq) | |
1019 | { | |
1020 | struct sock *sk = areq->sk; | |
1021 | ||
1022 | af_alg_free_areq_sgls(areq); | |
1023 | sock_kfree_s(sk, areq, areq->areqlen); | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(af_alg_free_resources); | |
1026 | ||
2d97591e SM |
1027 | /** |
1028 | * af_alg_async_cb - AIO callback handler | |
1029 | * | |
1030 | * This handler cleans up the struct af_alg_async_req upon completion of the | |
1031 | * AIO operation. | |
1032 | * | |
1033 | * The number of bytes to be generated with the AIO operation must be set | |
1034 | * in areq->outlen before the AIO callback handler is invoked. | |
1035 | */ | |
1036 | void af_alg_async_cb(struct crypto_async_request *_req, int err) | |
1037 | { | |
1038 | struct af_alg_async_req *areq = _req->data; | |
1039 | struct sock *sk = areq->sk; | |
1040 | struct kiocb *iocb = areq->iocb; | |
1041 | unsigned int resultlen; | |
1042 | ||
2d97591e SM |
1043 | /* Buffer size written by crypto operation. */ |
1044 | resultlen = areq->outlen; | |
1045 | ||
7d2c3f54 SM |
1046 | af_alg_free_resources(areq); |
1047 | sock_put(sk); | |
2d97591e | 1048 | |
64e7f852 | 1049 | iocb->ki_complete(iocb, err ? err : (int)resultlen, 0); |
2d97591e SM |
1050 | } |
1051 | EXPORT_SYMBOL_GPL(af_alg_async_cb); | |
1052 | ||
a11e1d43 LT |
1053 | /** |
1054 | * af_alg_poll - poll system call handler | |
1055 | */ | |
1056 | __poll_t af_alg_poll(struct file *file, struct socket *sock, | |
1057 | poll_table *wait) | |
2d97591e SM |
1058 | { |
1059 | struct sock *sk = sock->sk; | |
1060 | struct alg_sock *ask = alg_sk(sk); | |
1061 | struct af_alg_ctx *ctx = ask->private; | |
a11e1d43 LT |
1062 | __poll_t mask; |
1063 | ||
89ab066d | 1064 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1065 | mask = 0; |
2d97591e SM |
1066 | |
1067 | if (!ctx->more || ctx->used) | |
a9a08845 | 1068 | mask |= EPOLLIN | EPOLLRDNORM; |
2d97591e SM |
1069 | |
1070 | if (af_alg_writable(sk)) | |
a9a08845 | 1071 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
2d97591e SM |
1072 | |
1073 | return mask; | |
1074 | } | |
a11e1d43 | 1075 | EXPORT_SYMBOL_GPL(af_alg_poll); |
2d97591e SM |
1076 | |
1077 | /** | |
1078 | * af_alg_alloc_areq - allocate struct af_alg_async_req | |
1079 | * | |
1080 | * @sk socket of connection to user space | |
1081 | * @areqlen size of struct af_alg_async_req + crypto_*_reqsize | |
1082 | * @return allocated data structure or ERR_PTR upon error | |
1083 | */ | |
1084 | struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk, | |
1085 | unsigned int areqlen) | |
1086 | { | |
1087 | struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL); | |
1088 | ||
1089 | if (unlikely(!areq)) | |
1090 | return ERR_PTR(-ENOMEM); | |
1091 | ||
1092 | areq->areqlen = areqlen; | |
1093 | areq->sk = sk; | |
1094 | areq->last_rsgl = NULL; | |
1095 | INIT_LIST_HEAD(&areq->rsgl_list); | |
1096 | areq->tsgl = NULL; | |
1097 | areq->tsgl_entries = 0; | |
1098 | ||
1099 | return areq; | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(af_alg_alloc_areq); | |
1102 | ||
1103 | /** | |
1104 | * af_alg_get_rsgl - create the RX SGL for the output data from the crypto | |
1105 | * operation | |
1106 | * | |
1107 | * @sk socket of connection to user space | |
1108 | * @msg user space message | |
1109 | * @flags flags used to invoke recvmsg with | |
1110 | * @areq instance of the cryptographic request that will hold the RX SGL | |
1111 | * @maxsize maximum number of bytes to be pulled from user space | |
1112 | * @outlen number of bytes in the RX SGL | |
1113 | * @return 0 on success, < 0 upon error | |
1114 | */ | |
1115 | int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, | |
1116 | struct af_alg_async_req *areq, size_t maxsize, | |
1117 | size_t *outlen) | |
1118 | { | |
1119 | struct alg_sock *ask = alg_sk(sk); | |
1120 | struct af_alg_ctx *ctx = ask->private; | |
1121 | size_t len = 0; | |
1122 | ||
1123 | while (maxsize > len && msg_data_left(msg)) { | |
1124 | struct af_alg_rsgl *rsgl; | |
1125 | size_t seglen; | |
1126 | int err; | |
1127 | ||
1128 | /* limit the amount of readable buffers */ | |
1129 | if (!af_alg_readable(sk)) | |
1130 | break; | |
1131 | ||
2d97591e SM |
1132 | seglen = min_t(size_t, (maxsize - len), |
1133 | msg_data_left(msg)); | |
1134 | ||
1135 | if (list_empty(&areq->rsgl_list)) { | |
1136 | rsgl = &areq->first_rsgl; | |
1137 | } else { | |
1138 | rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL); | |
1139 | if (unlikely(!rsgl)) | |
1140 | return -ENOMEM; | |
1141 | } | |
1142 | ||
1143 | rsgl->sgl.npages = 0; | |
1144 | list_add_tail(&rsgl->list, &areq->rsgl_list); | |
1145 | ||
1146 | /* make one iovec available as scatterlist */ | |
1147 | err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); | |
2546da99 SM |
1148 | if (err < 0) { |
1149 | rsgl->sg_num_bytes = 0; | |
2d97591e | 1150 | return err; |
2546da99 | 1151 | } |
2d97591e SM |
1152 | |
1153 | /* chain the new scatterlist with previous one */ | |
1154 | if (areq->last_rsgl) | |
1155 | af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); | |
1156 | ||
1157 | areq->last_rsgl = rsgl; | |
1158 | len += err; | |
af955bf1 | 1159 | atomic_add(err, &ctx->rcvused); |
2d97591e SM |
1160 | rsgl->sg_num_bytes = err; |
1161 | iov_iter_advance(&msg->msg_iter, err); | |
1162 | } | |
1163 | ||
1164 | *outlen = len; | |
1165 | return 0; | |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(af_alg_get_rsgl); | |
1168 | ||
03c8efc1 HX |
1169 | static int __init af_alg_init(void) |
1170 | { | |
1171 | int err = proto_register(&alg_proto, 0); | |
1172 | ||
1173 | if (err) | |
1174 | goto out; | |
1175 | ||
1176 | err = sock_register(&alg_family); | |
1177 | if (err != 0) | |
1178 | goto out_unregister_proto; | |
1179 | ||
1180 | out: | |
1181 | return err; | |
1182 | ||
1183 | out_unregister_proto: | |
1184 | proto_unregister(&alg_proto); | |
1185 | goto out; | |
1186 | } | |
1187 | ||
1188 | static void __exit af_alg_exit(void) | |
1189 | { | |
1190 | sock_unregister(PF_ALG); | |
1191 | proto_unregister(&alg_proto); | |
1192 | } | |
1193 | ||
1194 | module_init(af_alg_init); | |
1195 | module_exit(af_alg_exit); | |
1196 | MODULE_LICENSE("GPL"); | |
1197 | MODULE_ALIAS_NETPROTO(AF_ALG); |