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TOMOYO Linux Cross Reference
Linux/crypto/af_alg.c

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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                 goto unlock;
252 
253         sk2->sk_family = PF_ALG;
254 
255         sock_hold(sk);
256         alg_sk(sk2)->parent = sk;
257         alg_sk(sk2)->type = type;
258 
259         newsock->ops = type->ops;
260         newsock->state = SS_CONNECTED;
261 
262         err = 0;
263 
264 unlock:
265         release_sock(sk);
266 
267         return err;
268 }
269 EXPORT_SYMBOL_GPL(af_alg_accept);
270 
271 static int alg_accept(struct socket *sock, struct socket *newsock, int flags)
272 {
273         return af_alg_accept(sock->sk, newsock);
274 }
275 
276 static const struct proto_ops alg_proto_ops = {
277         .family         =       PF_ALG,
278         .owner          =       THIS_MODULE,
279 
280         .connect        =       sock_no_connect,
281         .socketpair     =       sock_no_socketpair,
282         .getname        =       sock_no_getname,
283         .ioctl          =       sock_no_ioctl,
284         .listen         =       sock_no_listen,
285         .shutdown       =       sock_no_shutdown,
286         .getsockopt     =       sock_no_getsockopt,
287         .mmap           =       sock_no_mmap,
288         .sendpage       =       sock_no_sendpage,
289         .sendmsg        =       sock_no_sendmsg,
290         .recvmsg        =       sock_no_recvmsg,
291         .poll           =       sock_no_poll,
292 
293         .bind           =       alg_bind,
294         .release        =       af_alg_release,
295         .setsockopt     =       alg_setsockopt,
296         .accept         =       alg_accept,
297 };
298 
299 static void alg_sock_destruct(struct sock *sk)
300 {
301         struct alg_sock *ask = alg_sk(sk);
302 
303         alg_do_release(ask->type, ask->private);
304 }
305 
306 static int alg_create(struct net *net, struct socket *sock, int protocol,
307                       int kern)
308 {
309         struct sock *sk;
310         int err;
311 
312         if (sock->type != SOCK_SEQPACKET)
313                 return -ESOCKTNOSUPPORT;
314         if (protocol != 0)
315                 return -EPROTONOSUPPORT;
316 
317         err = -ENOMEM;
318         sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto);
319         if (!sk)
320                 goto out;
321 
322         sock->ops = &alg_proto_ops;
323         sock_init_data(sock, sk);
324 
325         sk->sk_family = PF_ALG;
326         sk->sk_destruct = alg_sock_destruct;
327 
328         return 0;
329 out:
330         return err;
331 }
332 
333 static const struct net_proto_family alg_family = {
334         .family =       PF_ALG,
335         .create =       alg_create,
336         .owner  =       THIS_MODULE,
337 };
338 
339 int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
340                    int write)
341 {
342         unsigned long from = (unsigned long)addr;
343         unsigned long npages;
344         unsigned off;
345         int err;
346         int i;
347 
348         err = -EFAULT;
349         if (!access_ok(write ? VERIFY_READ : VERIFY_WRITE, addr, len))
350                 goto out;
351 
352         off = from & ~PAGE_MASK;
353         npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
354         if (npages > ALG_MAX_PAGES)
355                 npages = ALG_MAX_PAGES;
356 
357         err = get_user_pages_fast(from, npages, write, sgl->pages);
358         if (err < 0)
359                 goto out;
360 
361         npages = err;
362         err = -EINVAL;
363         if (WARN_ON(npages == 0))
364                 goto out;
365 
366         err = 0;
367 
368         sg_init_table(sgl->sg, npages);
369 
370         for (i = 0; i < npages; i++) {
371                 int plen = min_t(int, len, PAGE_SIZE - off);
372 
373                 sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
374 
375                 off = 0;
376                 len -= plen;
377                 err += plen;
378         }
379 
380 out:
381         return err;
382 }
383 EXPORT_SYMBOL_GPL(af_alg_make_sg);
384 
385 void af_alg_free_sg(struct af_alg_sgl *sgl)
386 {
387         int i;
388 
389         i = 0;
390         do {
391                 put_page(sgl->pages[i]);
392         } while (!sg_is_last(sgl->sg + (i++)));
393 }
394 EXPORT_SYMBOL_GPL(af_alg_free_sg);
395 
396 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
397 {
398         struct cmsghdr *cmsg;
399 
400         for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
401                 if (!CMSG_OK(msg, cmsg))
402                         return -EINVAL;
403                 if (cmsg->cmsg_level != SOL_ALG)
404                         continue;
405 
406                 switch(cmsg->cmsg_type) {
407                 case ALG_SET_IV:
408                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
409                                 return -EINVAL;
410                         con->iv = (void *)CMSG_DATA(cmsg);
411                         if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
412                                                       sizeof(*con->iv)))
413                                 return -EINVAL;
414                         break;
415 
416                 case ALG_SET_OP:
417                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
418                                 return -EINVAL;
419                         con->op = *(u32 *)CMSG_DATA(cmsg);
420                         break;
421 
422                 default:
423                         return -EINVAL;
424                 }
425         }
426 
427         return 0;
428 }
429 EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
430 
431 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
432 {
433         switch (err) {
434         case -EINPROGRESS:
435         case -EBUSY:
436                 wait_for_completion(&completion->completion);
437                 reinit_completion(&completion->completion);
438                 err = completion->err;
439                 break;
440         };
441 
442         return err;
443 }
444 EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
445 
446 void af_alg_complete(struct crypto_async_request *req, int err)
447 {
448         struct af_alg_completion *completion = req->data;
449 
450         if (err == -EINPROGRESS)
451                 return;
452 
453         completion->err = err;
454         complete(&completion->completion);
455 }
456 EXPORT_SYMBOL_GPL(af_alg_complete);
457 
458 static int __init af_alg_init(void)
459 {
460         int err = proto_register(&alg_proto, 0);
461 
462         if (err)
463                 goto out;
464 
465         err = sock_register(&alg_family);
466         if (err != 0)
467                 goto out_unregister_proto;
468 
469 out:
470         return err;
471 
472 out_unregister_proto:
473         proto_unregister(&alg_proto);
474         goto out;
475 }
476 
477 static void __exit af_alg_exit(void)
478 {
479         sock_unregister(PF_ALG);
480         proto_unregister(&alg_proto);
481 }
482 
483 module_init(af_alg_init);
484 module_exit(af_alg_exit);
485 MODULE_LICENSE("GPL");
486 MODULE_ALIAS_NETPROTO(AF_ALG);
487 

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