~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/crypto/af_alg.c

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 25 struct alg_type_list {
 26         const struct af_alg_type *type;
 27         struct list_head list;
 28 };
 29 
 30 static atomic_long_t alg_memory_allocated;
 31 
 32 static struct proto alg_proto = {
 33         .name                   = "ALG",
 34         .owner                  = THIS_MODULE,
 35         .memory_allocated       = &alg_memory_allocated,
 36         .obj_size               = sizeof(struct alg_sock),
 37 };
 38 
 39 static LIST_HEAD(alg_types);
 40 static DECLARE_RWSEM(alg_types_sem);
 41 
 42 static const struct af_alg_type *alg_get_type(const char *name)
 43 {
 44         const struct af_alg_type *type = ERR_PTR(-ENOENT);
 45         struct alg_type_list *node;
 46 
 47         down_read(&alg_types_sem);
 48         list_for_each_entry(node, &alg_types, list) {
 49                 if (strcmp(node->type->name, name))
 50                         continue;
 51 
 52                 if (try_module_get(node->type->owner))
 53                         type = node->type;
 54                 break;
 55         }
 56         up_read(&alg_types_sem);
 57 
 58         return type;
 59 }
 60 
 61 int af_alg_register_type(const struct af_alg_type *type)
 62 {
 63         struct alg_type_list *node;
 64         int err = -EEXIST;
 65 
 66         down_write(&alg_types_sem);
 67         list_for_each_entry(node, &alg_types, list) {
 68                 if (!strcmp(node->type->name, type->name))
 69                         goto unlock;
 70         }
 71 
 72         node = kmalloc(sizeof(*node), GFP_KERNEL);
 73         err = -ENOMEM;
 74         if (!node)
 75                 goto unlock;
 76 
 77         type->ops->owner = THIS_MODULE;
 78         node->type = type;
 79         list_add(&node->list, &alg_types);
 80         err = 0;
 81 
 82 unlock:
 83         up_write(&alg_types_sem);
 84 
 85         return err;
 86 }
 87 EXPORT_SYMBOL_GPL(af_alg_register_type);
 88 
 89 int af_alg_unregister_type(const struct af_alg_type *type)
 90 {
 91         struct alg_type_list *node;
 92         int err = -ENOENT;
 93 
 94         down_write(&alg_types_sem);
 95         list_for_each_entry(node, &alg_types, list) {
 96                 if (strcmp(node->type->name, type->name))
 97                         continue;
 98 
 99                 list_del(&node->list);
100                 kfree(node);
101                 err = 0;
102                 break;
103         }
104         up_write(&alg_types_sem);
105 
106         return err;
107 }
108 EXPORT_SYMBOL_GPL(af_alg_unregister_type);
109 
110 static void alg_do_release(const struct af_alg_type *type, void *private)
111 {
112         if (!type)
113                 return;
114 
115         type->release(private);
116         module_put(type->owner);
117 }
118 
119 int af_alg_release(struct socket *sock)
120 {
121         if (sock->sk)
122                 sock_put(sock->sk);
123         return 0;
124 }
125 EXPORT_SYMBOL_GPL(af_alg_release);
126 
127 static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
128 {
129         struct sock *sk = sock->sk;
130         struct alg_sock *ask = alg_sk(sk);
131         struct sockaddr_alg *sa = (void *)uaddr;
132         const struct af_alg_type *type;
133         void *private;
134 
135         if (sock->state == SS_CONNECTED)
136                 return -EINVAL;
137 
138         if (addr_len != sizeof(*sa))
139                 return -EINVAL;
140 
141         sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
142         sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
143 
144         type = alg_get_type(sa->salg_type);
145         if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
146                 request_module("algif-%s", sa->salg_type);
147                 type = alg_get_type(sa->salg_type);
148         }
149 
150         if (IS_ERR(type))
151                 return PTR_ERR(type);
152 
153         private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask);
154         if (IS_ERR(private)) {
155                 module_put(type->owner);
156                 return PTR_ERR(private);
157         }
158 
159         lock_sock(sk);
160 
161         swap(ask->type, type);
162         swap(ask->private, private);
163 
164         release_sock(sk);
165 
166         alg_do_release(type, private);
167 
168         return 0;
169 }
170 
171 static int alg_setkey(struct sock *sk, char __user *ukey,
172                       unsigned int keylen)
173 {
174         struct alg_sock *ask = alg_sk(sk);
175         const struct af_alg_type *type = ask->type;
176         u8 *key;
177         int err;
178 
179         key = sock_kmalloc(sk, keylen, GFP_KERNEL);
180         if (!key)
181                 return -ENOMEM;
182 
183         err = -EFAULT;
184         if (copy_from_user(key, ukey, keylen))
185                 goto out;
186 
187         err = type->setkey(ask->private, key, keylen);
188 
189 out:
190         sock_kfree_s(sk, key, keylen);
191 
192         return err;
193 }
194 
195 static int alg_setsockopt(struct socket *sock, int level, int optname,
196                           char __user *optval, unsigned int optlen)
197 {
198         struct sock *sk = sock->sk;
199         struct alg_sock *ask = alg_sk(sk);
200         const struct af_alg_type *type;
201         int err = -ENOPROTOOPT;
202 
203         lock_sock(sk);
204         type = ask->type;
205 
206         if (level != SOL_ALG || !type)
207                 goto unlock;
208 
209         switch (optname) {
210         case ALG_SET_KEY:
211                 if (sock->state == SS_CONNECTED)
212                         goto unlock;
213                 if (!type->setkey)
214                         goto unlock;
215 
216                 err = alg_setkey(sk, optval, optlen);
217         }
218 
219 unlock:
220         release_sock(sk);
221 
222         return err;
223 }
224 
225 int af_alg_accept(struct sock *sk, struct socket *newsock)
226 {
227         struct alg_sock *ask = alg_sk(sk);
228         const struct af_alg_type *type;
229         struct sock *sk2;
230         int err;
231 
232         lock_sock(sk);
233         type = ask->type;
234 
235         err = -EINVAL;
236         if (!type)
237                 goto unlock;
238 
239         sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto);
240         err = -ENOMEM;
241         if (!sk2)
242                 goto unlock;
243 
244         sock_init_data(newsock, sk2);
245         sock_graft(sk2, newsock);
246 
247         err = type->accept(ask->private, sk2);
248         if (err) {
249                 sk_free(sk2);
250                 goto unlock;
251         }
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                 INIT_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         completion->err = err;
451         complete(&completion->completion);
452 }
453 EXPORT_SYMBOL_GPL(af_alg_complete);
454 
455 static int __init af_alg_init(void)
456 {
457         int err = proto_register(&alg_proto, 0);
458 
459         if (err)
460                 goto out;
461 
462         err = sock_register(&alg_family);
463         if (err != 0)
464                 goto out_unregister_proto;
465 
466 out:
467         return err;
468 
469 out_unregister_proto:
470         proto_unregister(&alg_proto);
471         goto out;
472 }
473 
474 static void __exit af_alg_exit(void)
475 {
476         sock_unregister(PF_ALG);
477         proto_unregister(&alg_proto);
478 }
479 
480 module_init(af_alg_init);
481 module_exit(af_alg_exit);
482 MODULE_LICENSE("GPL");
483 MODULE_ALIAS_NETPROTO(AF_ALG);
484 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp