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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 | |
15 | #include <linux/atomic.h> |
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> |
24 | #include <linux/security.h> |
25 | |
26 | struct alg_type_list { |
27 | const struct af_alg_type *type; |
28 | struct list_head list; |
29 | }; |
30 | |
31 | static atomic_long_t alg_memory_allocated; |
32 | |
33 | static struct proto alg_proto = { |
34 | .name = "ALG", |
35 | .owner = THIS_MODULE, |
36 | .memory_allocated = &alg_memory_allocated, |
37 | .obj_size = sizeof(struct alg_sock), |
38 | }; |
39 | |
40 | static LIST_HEAD(alg_types); |
41 | static DECLARE_RWSEM(alg_types_sem); |
42 | |
43 | static const struct af_alg_type *alg_get_type(const char *name) |
44 | { |
45 | const struct af_alg_type *type = ERR_PTR(-ENOENT); |
46 | struct alg_type_list *node; |
47 | |
48 | down_read(&alg_types_sem); |
49 | list_for_each_entry(node, &alg_types, list) { |
50 | if (strcmp(node->type->name, name)) |
51 | continue; |
52 | |
53 | if (try_module_get(node->type->owner)) |
54 | type = node->type; |
55 | break; |
56 | } |
57 | up_read(&alg_types_sem); |
58 | |
59 | return type; |
60 | } |
61 | |
62 | int af_alg_register_type(const struct af_alg_type *type) |
63 | { |
64 | struct alg_type_list *node; |
65 | int err = -EEXIST; |
66 | |
67 | down_write(&alg_types_sem); |
68 | list_for_each_entry(node, &alg_types, list) { |
69 | if (!strcmp(node->type->name, type->name)) |
70 | goto unlock; |
71 | } |
72 | |
73 | node = kmalloc(sizeof(*node), GFP_KERNEL); |
74 | err = -ENOMEM; |
75 | if (!node) |
76 | goto unlock; |
77 | |
78 | type->ops->owner = THIS_MODULE; |
79 | node->type = type; |
80 | list_add(&node->list, &alg_types); |
81 | err = 0; |
82 | |
83 | unlock: |
84 | up_write(&alg_types_sem); |
85 | |
86 | return err; |
87 | } |
88 | EXPORT_SYMBOL_GPL(af_alg_register_type); |
89 | |
90 | int af_alg_unregister_type(const struct af_alg_type *type) |
91 | { |
92 | struct alg_type_list *node; |
93 | int err = -ENOENT; |
94 | |
95 | down_write(&alg_types_sem); |
96 | list_for_each_entry(node, &alg_types, list) { |
97 | if (strcmp(node->type->name, type->name)) |
98 | continue; |
99 | |
100 | list_del(&node->list); |
101 | kfree(node); |
102 | err = 0; |
103 | break; |
104 | } |
105 | up_write(&alg_types_sem); |
106 | |
107 | return err; |
108 | } |
109 | EXPORT_SYMBOL_GPL(af_alg_unregister_type); |
110 | |
111 | static void alg_do_release(const struct af_alg_type *type, void *private) |
112 | { |
113 | if (!type) |
114 | return; |
115 | |
116 | type->release(private); |
117 | module_put(type->owner); |
118 | } |
119 | |
120 | int af_alg_release(struct socket *sock) |
121 | { |
122 | if (sock->sk) |
123 | sock_put(sock->sk); |
124 | return 0; |
125 | } |
126 | EXPORT_SYMBOL_GPL(af_alg_release); |
127 | |
128 | static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
129 | { |
130 | struct sock *sk = sock->sk; |
131 | struct alg_sock *ask = alg_sk(sk); |
132 | struct sockaddr_alg *sa = (void *)uaddr; |
133 | const struct af_alg_type *type; |
134 | void *private; |
135 | |
136 | if (sock->state == SS_CONNECTED) |
137 | return -EINVAL; |
138 | |
139 | if (addr_len != sizeof(*sa)) |
140 | return -EINVAL; |
141 | |
142 | sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
143 | sa->salg_name[sizeof(sa->salg_name) - 1] = 0; |
144 | |
145 | type = alg_get_type(sa->salg_type); |
146 | if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) { |
147 | request_module("algif-%s", sa->salg_type); |
148 | type = alg_get_type(sa->salg_type); |
149 | } |
150 | |
151 | if (IS_ERR(type)) |
152 | return PTR_ERR(type); |
153 | |
154 | private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
155 | if (IS_ERR(private)) { |
156 | module_put(type->owner); |
157 | return PTR_ERR(private); |
158 | } |
159 | |
160 | lock_sock(sk); |
161 | |
162 | swap(ask->type, type); |
163 | swap(ask->private, private); |
164 | |
165 | release_sock(sk); |
166 | |
167 | alg_do_release(type, private); |
168 | |
169 | return 0; |
170 | } |
171 | |
172 | static int alg_setkey(struct sock *sk, char __user *ukey, |
173 | unsigned int keylen) |
174 | { |
175 | struct alg_sock *ask = alg_sk(sk); |
176 | const struct af_alg_type *type = ask->type; |
177 | u8 *key; |
178 | int err; |
179 | |
180 | key = sock_kmalloc(sk, keylen, GFP_KERNEL); |
181 | if (!key) |
182 | return -ENOMEM; |
183 | |
184 | err = -EFAULT; |
185 | if (copy_from_user(key, ukey, keylen)) |
186 | goto out; |
187 | |
188 | err = type->setkey(ask->private, key, keylen); |
189 | |
190 | out: |
191 | sock_kfree_s(sk, key, keylen); |
192 | |
193 | return err; |
194 | } |
195 | |
196 | static int alg_setsockopt(struct socket *sock, int level, int optname, |
197 | char __user *optval, unsigned int optlen) |
198 | { |
199 | struct sock *sk = sock->sk; |
200 | struct alg_sock *ask = alg_sk(sk); |
201 | const struct af_alg_type *type; |
202 | int err = -ENOPROTOOPT; |
203 | |
204 | lock_sock(sk); |
205 | type = ask->type; |
206 | |
207 | if (level != SOL_ALG || !type) |
208 | goto unlock; |
209 | |
210 | switch (optname) { |
211 | case ALG_SET_KEY: |
212 | if (sock->state == SS_CONNECTED) |
213 | goto unlock; |
214 | if (!type->setkey) |
215 | goto unlock; |
216 | |
217 | err = alg_setkey(sk, optval, optlen); |
218 | } |
219 | |
220 | unlock: |
221 | release_sock(sk); |
222 | |
223 | return err; |
224 | } |
225 | |
226 | int af_alg_accept(struct sock *sk, struct socket *newsock) |
227 | { |
228 | struct alg_sock *ask = alg_sk(sk); |
229 | const struct af_alg_type *type; |
230 | struct sock *sk2; |
231 | int err; |
232 | |
233 | lock_sock(sk); |
234 | type = ask->type; |
235 | |
236 | err = -EINVAL; |
237 | if (!type) |
238 | goto unlock; |
239 | |
240 | sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto); |
241 | err = -ENOMEM; |
242 | if (!sk2) |
243 | goto unlock; |
244 | |
245 | sock_init_data(newsock, sk2); |
246 | sock_graft(sk2, newsock); |
247 | security_sk_clone(sk, sk2); |
248 | |
249 | err = type->accept(ask->private, sk2); |
250 | if (err) { |
251 | sk_free(sk2); |
252 | goto unlock; |
253 | } |
254 | |
255 | sk2->sk_family = PF_ALG; |
256 | |
257 | sock_hold(sk); |
258 | alg_sk(sk2)->parent = sk; |
259 | alg_sk(sk2)->type = type; |
260 | |
261 | newsock->ops = type->ops; |
262 | newsock->state = SS_CONNECTED; |
263 | |
264 | err = 0; |
265 | |
266 | unlock: |
267 | release_sock(sk); |
268 | |
269 | return err; |
270 | } |
271 | EXPORT_SYMBOL_GPL(af_alg_accept); |
272 | |
273 | static int alg_accept(struct socket *sock, struct socket *newsock, int flags) |
274 | { |
275 | return af_alg_accept(sock->sk, newsock); |
276 | } |
277 | |
278 | static const struct proto_ops alg_proto_ops = { |
279 | .family = PF_ALG, |
280 | .owner = THIS_MODULE, |
281 | |
282 | .connect = sock_no_connect, |
283 | .socketpair = sock_no_socketpair, |
284 | .getname = sock_no_getname, |
285 | .ioctl = sock_no_ioctl, |
286 | .listen = sock_no_listen, |
287 | .shutdown = sock_no_shutdown, |
288 | .getsockopt = sock_no_getsockopt, |
289 | .mmap = sock_no_mmap, |
290 | .sendpage = sock_no_sendpage, |
291 | .sendmsg = sock_no_sendmsg, |
292 | .recvmsg = sock_no_recvmsg, |
293 | .poll = sock_no_poll, |
294 | |
295 | .bind = alg_bind, |
296 | .release = af_alg_release, |
297 | .setsockopt = alg_setsockopt, |
298 | .accept = alg_accept, |
299 | }; |
300 | |
301 | static void alg_sock_destruct(struct sock *sk) |
302 | { |
303 | struct alg_sock *ask = alg_sk(sk); |
304 | |
305 | alg_do_release(ask->type, ask->private); |
306 | } |
307 | |
308 | static int alg_create(struct net *net, struct socket *sock, int protocol, |
309 | int kern) |
310 | { |
311 | struct sock *sk; |
312 | int err; |
313 | |
314 | if (sock->type != SOCK_SEQPACKET) |
315 | return -ESOCKTNOSUPPORT; |
316 | if (protocol != 0) |
317 | return -EPROTONOSUPPORT; |
318 | |
319 | err = -ENOMEM; |
320 | sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto); |
321 | if (!sk) |
322 | goto out; |
323 | |
324 | sock->ops = &alg_proto_ops; |
325 | sock_init_data(sock, sk); |
326 | |
327 | sk->sk_family = PF_ALG; |
328 | sk->sk_destruct = alg_sock_destruct; |
329 | |
330 | return 0; |
331 | out: |
332 | return err; |
333 | } |
334 | |
335 | static const struct net_proto_family alg_family = { |
336 | .family = PF_ALG, |
337 | .create = alg_create, |
338 | .owner = THIS_MODULE, |
339 | }; |
340 | |
341 | int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len, |
342 | int write) |
343 | { |
344 | unsigned long from = (unsigned long)addr; |
345 | unsigned long npages; |
346 | unsigned off; |
347 | int err; |
348 | int i; |
349 | |
350 | err = -EFAULT; |
351 | if (!access_ok(write ? VERIFY_READ : VERIFY_WRITE, addr, len)) |
352 | goto out; |
353 | |
354 | off = from & ~PAGE_MASK; |
355 | npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
356 | if (npages > ALG_MAX_PAGES) |
357 | npages = ALG_MAX_PAGES; |
358 | |
359 | err = get_user_pages_fast(from, npages, write, sgl->pages); |
360 | if (err < 0) |
361 | goto out; |
362 | |
363 | npages = err; |
364 | err = -EINVAL; |
365 | if (WARN_ON(npages == 0)) |
366 | goto out; |
367 | |
368 | err = 0; |
369 | |
370 | sg_init_table(sgl->sg, npages); |
371 | |
372 | for (i = 0; i < npages; i++) { |
373 | int plen = min_t(int, len, PAGE_SIZE - off); |
374 | |
375 | sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); |
376 | |
377 | off = 0; |
378 | len -= plen; |
379 | err += plen; |
380 | } |
381 | |
382 | out: |
383 | return err; |
384 | } |
385 | EXPORT_SYMBOL_GPL(af_alg_make_sg); |
386 | |
387 | void af_alg_free_sg(struct af_alg_sgl *sgl) |
388 | { |
389 | int i; |
390 | |
391 | i = 0; |
392 | do { |
393 | put_page(sgl->pages[i]); |
394 | } while (!sg_is_last(sgl->sg + (i++))); |
395 | } |
396 | EXPORT_SYMBOL_GPL(af_alg_free_sg); |
397 | |
398 | int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con) |
399 | { |
400 | struct cmsghdr *cmsg; |
401 | |
402 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
403 | if (!CMSG_OK(msg, cmsg)) |
404 | return -EINVAL; |
405 | if (cmsg->cmsg_level != SOL_ALG) |
406 | continue; |
407 | |
408 | switch(cmsg->cmsg_type) { |
409 | case ALG_SET_IV: |
410 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv))) |
411 | return -EINVAL; |
412 | con->iv = (void *)CMSG_DATA(cmsg); |
413 | if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen + |
414 | sizeof(*con->iv))) |
415 | return -EINVAL; |
416 | break; |
417 | |
418 | case ALG_SET_OP: |
419 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32))) |
420 | return -EINVAL; |
421 | con->op = *(u32 *)CMSG_DATA(cmsg); |
422 | break; |
423 | |
424 | default: |
425 | return -EINVAL; |
426 | } |
427 | } |
428 | |
429 | return 0; |
430 | } |
431 | EXPORT_SYMBOL_GPL(af_alg_cmsg_send); |
432 | |
433 | int af_alg_wait_for_completion(int err, struct af_alg_completion *completion) |
434 | { |
435 | switch (err) { |
436 | case -EINPROGRESS: |
437 | case -EBUSY: |
438 | wait_for_completion(&completion->completion); |
439 | reinit_completion(&completion->completion); |
440 | err = completion->err; |
441 | break; |
442 | }; |
443 | |
444 | return err; |
445 | } |
446 | EXPORT_SYMBOL_GPL(af_alg_wait_for_completion); |
447 | |
448 | void af_alg_complete(struct crypto_async_request *req, int err) |
449 | { |
450 | struct af_alg_completion *completion = req->data; |
451 | |
452 | completion->err = err; |
453 | complete(&completion->completion); |
454 | } |
455 | EXPORT_SYMBOL_GPL(af_alg_complete); |
456 | |
457 | static int __init af_alg_init(void) |
458 | { |
459 | int err = proto_register(&alg_proto, 0); |
460 | |
461 | if (err) |
462 | goto out; |
463 | |
464 | err = sock_register(&alg_family); |
465 | if (err != 0) |
466 | goto out_unregister_proto; |
467 | |
468 | out: |
469 | return err; |
470 | |
471 | out_unregister_proto: |
472 | proto_unregister(&alg_proto); |
473 | goto out; |
474 | } |
475 | |
476 | static void __exit af_alg_exit(void) |
477 | { |
478 | sock_unregister(PF_ALG); |
479 | proto_unregister(&alg_proto); |
480 | } |
481 | |
482 | module_init(af_alg_init); |
483 | module_exit(af_alg_exit); |
484 | MODULE_LICENSE("GPL"); |
485 | MODULE_ALIAS_NETPROTO(AF_ALG); |
486 |
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