Blame view
crypto/algif_skcipher.c
9.87 KB
2874c5fd2 treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
8ff590903 crypto: algif_skc... |
2 3 4 5 6 7 8 |
/* * algif_skcipher: User-space interface for skcipher algorithms * * This file provides the user-space API for symmetric key ciphers. * * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> * |
e870456d8 crypto: algif_skc... |
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
* The following concept of the memory management is used: * * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is * filled by user space with the data submitted via sendpage/sendmsg. Filling * up the TX SGL does not cause a crypto operation -- the data will only be * tracked by the kernel. Upon receipt of one recvmsg call, the caller must * provide a buffer which is tracked with the RX SGL. * * During the processing of the recvmsg operation, the cipher request is * allocated and prepared. As part of the recvmsg operation, the processed * TX buffers are extracted from the TX SGL into a separate SGL. * * After the completion of the crypto operation, the RX SGL and the cipher * request is released. The extracted TX SGL parts are released together with * the RX SGL release. |
8ff590903 crypto: algif_skc... |
24 25 26 27 28 29 30 31 32 33 34 35 |
*/ #include <crypto/scatterwalk.h> #include <crypto/skcipher.h> #include <crypto/if_alg.h> #include <linux/init.h> #include <linux/list.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/net.h> #include <net/sock.h> |
1b7841404 net: Remove iocb ... |
36 37 |
static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
8ff590903 crypto: algif_skc... |
38 39 40 |
{ struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); |
6454c2b83 crypto: algif_skc... |
41 42 |
struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
f8d33fac8 crypto: skcipher ... |
43 |
struct crypto_skcipher *tfm = pask->private; |
0d96e4bab crypto: algif_skc... |
44 |
unsigned ivsize = crypto_skcipher_ivsize(tfm); |
8ff590903 crypto: algif_skc... |
45 |
|
2d97591ef crypto: af_alg - ... |
46 |
return af_alg_sendmsg(sock, msg, size, ivsize); |
a596999b7 crypto: algif - c... |
47 |
} |
e870456d8 crypto: algif_skc... |
48 49 |
static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
a596999b7 crypto: algif - c... |
50 51 52 |
{ struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); |
ec69bbfb9 crypto: algif_skc... |
53 54 |
struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
2d97591ef crypto: af_alg - ... |
55 |
struct af_alg_ctx *ctx = ask->private; |
f8d33fac8 crypto: skcipher ... |
56 |
struct crypto_skcipher *tfm = pask->private; |
d7835f2b8 crypto: algif_skc... |
57 |
unsigned int bs = crypto_skcipher_chunksize(tfm); |
2d97591ef crypto: af_alg - ... |
58 |
struct af_alg_async_req *areq; |
e870456d8 crypto: algif_skc... |
59 60 |
int err = 0; size_t len = 0; |
ec69bbfb9 crypto: algif_skc... |
61 |
|
11edb5559 crypto: af_alg - ... |
62 63 64 65 66 |
if (!ctx->used) { err = af_alg_wait_for_data(sk, flags); if (err) return err; } |
e870456d8 crypto: algif_skc... |
67 |
/* Allocate cipher request for current operation. */ |
2d97591ef crypto: af_alg - ... |
68 69 70 71 |
areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) + crypto_skcipher_reqsize(tfm)); if (IS_ERR(areq)) return PTR_ERR(areq); |
a596999b7 crypto: algif - c... |
72 |
|
e870456d8 crypto: algif_skc... |
73 |
/* convert iovecs of output buffers into RX SGL */ |
2d97591ef crypto: af_alg - ... |
74 75 76 |
err = af_alg_get_rsgl(sk, msg, flags, areq, -1, &len); if (err) goto free; |
a596999b7 crypto: algif - c... |
77 |
|
e870456d8 crypto: algif_skc... |
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 |
/* Process only as much RX buffers for which we have TX data */ if (len > ctx->used) len = ctx->used; /* * If more buffers are to be expected to be processed, process only * full block size buffers. */ if (ctx->more || len < ctx->used) len -= len % bs; /* * Create a per request TX SGL for this request which tracks the * SG entries from the global TX SGL. */ |
2d97591ef crypto: af_alg - ... |
93 |
areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0); |
e870456d8 crypto: algif_skc... |
94 95 |
if (!areq->tsgl_entries) areq->tsgl_entries = 1; |
76e43e37a treewide: Use arr... |
96 97 |
areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl), areq->tsgl_entries), |
e870456d8 crypto: algif_skc... |
98 99 100 101 102 103 |
GFP_KERNEL); if (!areq->tsgl) { err = -ENOMEM; goto free; } sg_init_table(areq->tsgl, areq->tsgl_entries); |
2d97591ef crypto: af_alg - ... |
104 |
af_alg_pull_tsgl(sk, len, areq->tsgl, 0); |
e870456d8 crypto: algif_skc... |
105 106 |
/* Initialize the crypto operation */ |
2d97591ef crypto: af_alg - ... |
107 108 109 |
skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm); skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl, areq->first_rsgl.sgl.sg, len, ctx->iv); |
e870456d8 crypto: algif_skc... |
110 111 112 |
if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) { /* AIO operation */ |
7d2c3f54e crypto: af_alg - ... |
113 |
sock_hold(sk); |
e870456d8 crypto: algif_skc... |
114 |
areq->iocb = msg->msg_iocb; |
d53c51357 crypto: af_alg - ... |
115 116 117 |
/* Remember output size that will be generated. */ areq->outlen = len; |
2d97591ef crypto: af_alg - ... |
118 |
skcipher_request_set_callback(&areq->cra_u.skcipher_req, |
e870456d8 crypto: algif_skc... |
119 |
CRYPTO_TFM_REQ_MAY_SLEEP, |
2d97591ef crypto: af_alg - ... |
120 121 122 123 |
af_alg_async_cb, areq); err = ctx->enc ? crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) : crypto_skcipher_decrypt(&areq->cra_u.skcipher_req); |
7d2c3f54e crypto: af_alg - ... |
124 125 |
/* AIO operation in progress */ |
d53c51357 crypto: af_alg - ... |
126 |
if (err == -EINPROGRESS || err == -EBUSY) |
7d2c3f54e crypto: af_alg - ... |
127 |
return -EIOCBQUEUED; |
7d2c3f54e crypto: af_alg - ... |
128 129 |
sock_put(sk); |
e870456d8 crypto: algif_skc... |
130 131 |
} else { /* Synchronous operation */ |
2d97591ef crypto: af_alg - ... |
132 |
skcipher_request_set_callback(&areq->cra_u.skcipher_req, |
e870456d8 crypto: algif_skc... |
133 134 |
CRYPTO_TFM_REQ_MAY_SLEEP | CRYPTO_TFM_REQ_MAY_BACKLOG, |
2c3f8b162 crypto: algif - m... |
135 136 |
crypto_req_done, &ctx->wait); err = crypto_wait_req(ctx->enc ? |
2d97591ef crypto: af_alg - ... |
137 138 |
crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) : crypto_skcipher_decrypt(&areq->cra_u.skcipher_req), |
2c3f8b162 crypto: algif - m... |
139 |
&ctx->wait); |
e870456d8 crypto: algif_skc... |
140 |
} |
033f46b3c crypto: algif - e... |
141 |
|
e870456d8 crypto: algif_skc... |
142 |
|
a596999b7 crypto: algif - c... |
143 |
free: |
7d2c3f54e crypto: af_alg - ... |
144 |
af_alg_free_resources(areq); |
e870456d8 crypto: algif_skc... |
145 146 |
return err ? err : len; |
a596999b7 crypto: algif - c... |
147 |
} |
e870456d8 crypto: algif_skc... |
148 149 |
static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
8ff590903 crypto: algif_skc... |
150 151 |
{ struct sock *sk = sock->sk; |
e870456d8 crypto: algif_skc... |
152 |
int ret = 0; |
8ff590903 crypto: algif_skc... |
153 154 |
lock_sock(sk); |
01e97e651 new helper: msg_d... |
155 |
while (msg_data_left(msg)) { |
e870456d8 crypto: algif_skc... |
156 157 158 159 160 161 162 |
int err = _skcipher_recvmsg(sock, msg, ignored, flags); /* * This error covers -EIOCBQUEUED which implies that we can * only handle one AIO request. If the caller wants to have * multiple AIO requests in parallel, he must make multiple * separate AIO calls. |
5703c826b crypto: algif - r... |
163 164 |
* * Also return the error if no data has been processed so far. |
e870456d8 crypto: algif_skc... |
165 166 |
*/ if (err <= 0) { |
5703c826b crypto: algif - r... |
167 |
if (err == -EIOCBQUEUED || !ret) |
e870456d8 crypto: algif_skc... |
168 169 |
ret = err; goto out; |
1d10eb2f1 crypto: switch af... |
170 |
} |
e870456d8 crypto: algif_skc... |
171 |
ret += err; |
8ff590903 crypto: algif_skc... |
172 |
} |
e870456d8 crypto: algif_skc... |
173 |
out: |
2d97591ef crypto: af_alg - ... |
174 |
af_alg_wmem_wakeup(sk); |
8ff590903 crypto: algif_skc... |
175 |
release_sock(sk); |
e870456d8 crypto: algif_skc... |
176 |
return ret; |
a596999b7 crypto: algif - c... |
177 |
} |
8ff590903 crypto: algif_skc... |
178 |
|
8ff590903 crypto: algif_skc... |
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 |
static struct proto_ops algif_skcipher_ops = { .family = PF_ALG, .connect = sock_no_connect, .socketpair = sock_no_socketpair, .getname = sock_no_getname, .ioctl = sock_no_ioctl, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .getsockopt = sock_no_getsockopt, .mmap = sock_no_mmap, .bind = sock_no_bind, .accept = sock_no_accept, .setsockopt = sock_no_setsockopt, .release = af_alg_release, .sendmsg = skcipher_sendmsg, |
2d97591ef crypto: af_alg - ... |
196 |
.sendpage = af_alg_sendpage, |
8ff590903 crypto: algif_skc... |
197 |
.recvmsg = skcipher_recvmsg, |
a11e1d432 Revert changes to... |
198 |
.poll = af_alg_poll, |
8ff590903 crypto: algif_skc... |
199 |
}; |
a0fa2d037 crypto: algif_skc... |
200 201 |
static int skcipher_check_key(struct socket *sock) { |
1822793a5 crypto: algif_skc... |
202 |
int err = 0; |
a0fa2d037 crypto: algif_skc... |
203 204 |
struct sock *psk; struct alg_sock *pask; |
f8d33fac8 crypto: skcipher ... |
205 |
struct crypto_skcipher *tfm; |
a0fa2d037 crypto: algif_skc... |
206 207 |
struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); |
1822793a5 crypto: algif_skc... |
208 |
lock_sock(sk); |
a0fa2d037 crypto: algif_skc... |
209 |
if (ask->refcnt) |
1822793a5 crypto: algif_skc... |
210 |
goto unlock_child; |
a0fa2d037 crypto: algif_skc... |
211 212 213 214 215 216 |
psk = ask->parent; pask = alg_sk(ask->parent); tfm = pask->private; err = -ENOKEY; |
1822793a5 crypto: algif_skc... |
217 |
lock_sock_nested(psk, SINGLE_DEPTH_NESTING); |
f8d33fac8 crypto: skcipher ... |
218 |
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
a0fa2d037 crypto: algif_skc... |
219 220 221 222 223 224 225 226 227 228 229 230 |
goto unlock; if (!pask->refcnt++) sock_hold(psk); ask->refcnt = 1; sock_put(psk); err = 0; unlock: release_sock(psk); |
1822793a5 crypto: algif_skc... |
231 232 |
unlock_child: release_sock(sk); |
a0fa2d037 crypto: algif_skc... |
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 |
return err; } static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg, size_t size) { int err; err = skcipher_check_key(sock); if (err) return err; return skcipher_sendmsg(sock, msg, size); } static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page, int offset, size_t size, int flags) { int err; err = skcipher_check_key(sock); if (err) return err; |
2d97591ef crypto: af_alg - ... |
257 |
return af_alg_sendpage(sock, page, offset, size, flags); |
a0fa2d037 crypto: algif_skc... |
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 |
} static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) { int err; err = skcipher_check_key(sock); if (err) return err; return skcipher_recvmsg(sock, msg, ignored, flags); } static struct proto_ops algif_skcipher_ops_nokey = { .family = PF_ALG, .connect = sock_no_connect, .socketpair = sock_no_socketpair, .getname = sock_no_getname, .ioctl = sock_no_ioctl, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .getsockopt = sock_no_getsockopt, .mmap = sock_no_mmap, .bind = sock_no_bind, .accept = sock_no_accept, .setsockopt = sock_no_setsockopt, .release = af_alg_release, .sendmsg = skcipher_sendmsg_nokey, .sendpage = skcipher_sendpage_nokey, .recvmsg = skcipher_recvmsg_nokey, |
a11e1d432 Revert changes to... |
291 |
.poll = af_alg_poll, |
a0fa2d037 crypto: algif_skc... |
292 |
}; |
8ff590903 crypto: algif_skc... |
293 294 |
static void *skcipher_bind(const char *name, u32 type, u32 mask) { |
f8d33fac8 crypto: skcipher ... |
295 |
return crypto_alloc_skcipher(name, type, mask); |
8ff590903 crypto: algif_skc... |
296 297 298 299 |
} static void skcipher_release(void *private) { |
f8d33fac8 crypto: skcipher ... |
300 |
crypto_free_skcipher(private); |
8ff590903 crypto: algif_skc... |
301 302 303 304 |
} static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen) { |
f8d33fac8 crypto: skcipher ... |
305 |
return crypto_skcipher_setkey(private, key, keylen); |
8ff590903 crypto: algif_skc... |
306 307 308 309 310 |
} static void skcipher_sock_destruct(struct sock *sk) { struct alg_sock *ask = alg_sk(sk); |
2d97591ef crypto: af_alg - ... |
311 |
struct af_alg_ctx *ctx = ask->private; |
e870456d8 crypto: algif_skc... |
312 313 |
struct sock *psk = ask->parent; struct alg_sock *pask = alg_sk(psk); |
f8d33fac8 crypto: skcipher ... |
314 |
struct crypto_skcipher *tfm = pask->private; |
a596999b7 crypto: algif - c... |
315 |
|
2d97591ef crypto: af_alg - ... |
316 |
af_alg_pull_tsgl(sk, ctx->used, NULL, 0); |
0d96e4bab crypto: algif_skc... |
317 |
sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm)); |
8ff590903 crypto: algif_skc... |
318 319 320 |
sock_kfree_s(sk, ctx, ctx->len); af_alg_release_parent(sk); } |
d7b65aee1 crypto: algif_skc... |
321 |
static int skcipher_accept_parent_nokey(void *private, struct sock *sk) |
8ff590903 crypto: algif_skc... |
322 |
{ |
2d97591ef crypto: af_alg - ... |
323 |
struct af_alg_ctx *ctx; |
8ff590903 crypto: algif_skc... |
324 |
struct alg_sock *ask = alg_sk(sk); |
f8d33fac8 crypto: skcipher ... |
325 |
struct crypto_skcipher *tfm = private; |
e870456d8 crypto: algif_skc... |
326 |
unsigned int len = sizeof(*ctx); |
8ff590903 crypto: algif_skc... |
327 328 329 330 |
ctx = sock_kmalloc(sk, len, GFP_KERNEL); if (!ctx) return -ENOMEM; |
f8d33fac8 crypto: skcipher ... |
331 |
ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm), |
8ff590903 crypto: algif_skc... |
332 333 334 335 336 |
GFP_KERNEL); if (!ctx->iv) { sock_kfree_s(sk, ctx, len); return -ENOMEM; } |
f8d33fac8 crypto: skcipher ... |
337 |
memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm)); |
8ff590903 crypto: algif_skc... |
338 |
|
e870456d8 crypto: algif_skc... |
339 |
INIT_LIST_HEAD(&ctx->tsgl_list); |
8ff590903 crypto: algif_skc... |
340 341 |
ctx->len = len; ctx->used = 0; |
af955bf15 crypto: af_alg - ... |
342 |
atomic_set(&ctx->rcvused, 0); |
8ff590903 crypto: algif_skc... |
343 344 345 |
ctx->more = 0; ctx->merge = 0; ctx->enc = 0; |
2c3f8b162 crypto: algif - m... |
346 |
crypto_init_wait(&ctx->wait); |
8ff590903 crypto: algif_skc... |
347 348 |
ask->private = ctx; |
8ff590903 crypto: algif_skc... |
349 350 351 352 |
sk->sk_destruct = skcipher_sock_destruct; return 0; } |
a0fa2d037 crypto: algif_skc... |
353 354 |
static int skcipher_accept_parent(void *private, struct sock *sk) { |
f8d33fac8 crypto: skcipher ... |
355 |
struct crypto_skcipher *tfm = private; |
a0fa2d037 crypto: algif_skc... |
356 |
|
f8d33fac8 crypto: skcipher ... |
357 |
if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
a0fa2d037 crypto: algif_skc... |
358 |
return -ENOKEY; |
d7b65aee1 crypto: algif_skc... |
359 |
return skcipher_accept_parent_nokey(private, sk); |
a0fa2d037 crypto: algif_skc... |
360 |
} |
8ff590903 crypto: algif_skc... |
361 362 363 364 365 |
static const struct af_alg_type algif_type_skcipher = { .bind = skcipher_bind, .release = skcipher_release, .setkey = skcipher_setkey, .accept = skcipher_accept_parent, |
a0fa2d037 crypto: algif_skc... |
366 |
.accept_nokey = skcipher_accept_parent_nokey, |
8ff590903 crypto: algif_skc... |
367 |
.ops = &algif_skcipher_ops, |
a0fa2d037 crypto: algif_skc... |
368 |
.ops_nokey = &algif_skcipher_ops_nokey, |
8ff590903 crypto: algif_skc... |
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 |
.name = "skcipher", .owner = THIS_MODULE }; static int __init algif_skcipher_init(void) { return af_alg_register_type(&algif_type_skcipher); } static void __exit algif_skcipher_exit(void) { int err = af_alg_unregister_type(&algif_type_skcipher); BUG_ON(err); } module_init(algif_skcipher_init); module_exit(algif_skcipher_exit); MODULE_LICENSE("GPL"); |