1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * af_alg: User-space algorithm interface 3 * af_alg: User-space algorithm interface
4 * 4 *
5 * This file provides the user-space API for a 5 * This file provides the user-space API for algorithms.
6 * 6 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gond 7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 */ 8 */
9 9
10 #include <linux/atomic.h> 10 #include <linux/atomic.h>
11 #include <crypto/if_alg.h> 11 #include <crypto/if_alg.h>
12 #include <linux/crypto.h> 12 #include <linux/crypto.h>
13 #include <linux/init.h> 13 #include <linux/init.h>
14 #include <linux/kernel.h> 14 #include <linux/kernel.h>
15 #include <linux/key.h> 15 #include <linux/key.h>
16 #include <linux/key-type.h> 16 #include <linux/key-type.h>
17 #include <linux/list.h> 17 #include <linux/list.h>
18 #include <linux/module.h> 18 #include <linux/module.h>
19 #include <linux/net.h> 19 #include <linux/net.h>
20 #include <linux/rwsem.h> 20 #include <linux/rwsem.h>
21 #include <linux/sched.h> 21 #include <linux/sched.h>
22 #include <linux/sched/signal.h> 22 #include <linux/sched/signal.h>
23 #include <linux/security.h> 23 #include <linux/security.h>
24 #include <linux/string.h> 24 #include <linux/string.h>
25 #include <keys/user-type.h> 25 #include <keys/user-type.h>
26 #include <keys/trusted-type.h> 26 #include <keys/trusted-type.h>
27 #include <keys/encrypted-type.h> 27 #include <keys/encrypted-type.h>
28 28
29 struct alg_type_list { 29 struct alg_type_list {
30 const struct af_alg_type *type; 30 const struct af_alg_type *type;
31 struct list_head list; 31 struct list_head list;
32 }; 32 };
33 33
34 static struct proto alg_proto = { 34 static struct proto alg_proto = {
35 .name = "ALG", 35 .name = "ALG",
36 .owner = THIS_MODULE, 36 .owner = THIS_MODULE,
37 .obj_size = sizeof(struc 37 .obj_size = sizeof(struct alg_sock),
38 }; 38 };
39 39
40 static LIST_HEAD(alg_types); 40 static LIST_HEAD(alg_types);
41 static DECLARE_RWSEM(alg_types_sem); 41 static DECLARE_RWSEM(alg_types_sem);
42 42
43 static const struct af_alg_type *alg_get_type( 43 static const struct af_alg_type *alg_get_type(const char *name)
44 { 44 {
45 const struct af_alg_type *type = ERR_P 45 const struct af_alg_type *type = ERR_PTR(-ENOENT);
46 struct alg_type_list *node; 46 struct alg_type_list *node;
47 47
48 down_read(&alg_types_sem); 48 down_read(&alg_types_sem);
49 list_for_each_entry(node, &alg_types, 49 list_for_each_entry(node, &alg_types, list) {
50 if (strcmp(node->type->name, n 50 if (strcmp(node->type->name, name))
51 continue; 51 continue;
52 52
53 if (try_module_get(node->type- 53 if (try_module_get(node->type->owner))
54 type = node->type; 54 type = node->type;
55 break; 55 break;
56 } 56 }
57 up_read(&alg_types_sem); 57 up_read(&alg_types_sem);
58 58
59 return type; 59 return type;
60 } 60 }
61 61
62 int af_alg_register_type(const struct af_alg_t 62 int af_alg_register_type(const struct af_alg_type *type)
63 { 63 {
64 struct alg_type_list *node; 64 struct alg_type_list *node;
65 int err = -EEXIST; 65 int err = -EEXIST;
66 66
67 down_write(&alg_types_sem); 67 down_write(&alg_types_sem);
68 list_for_each_entry(node, &alg_types, 68 list_for_each_entry(node, &alg_types, list) {
69 if (!strcmp(node->type->name, 69 if (!strcmp(node->type->name, type->name))
70 goto unlock; 70 goto unlock;
71 } 71 }
72 72
73 node = kmalloc(sizeof(*node), GFP_KERN 73 node = kmalloc(sizeof(*node), GFP_KERNEL);
74 err = -ENOMEM; 74 err = -ENOMEM;
75 if (!node) 75 if (!node)
76 goto unlock; 76 goto unlock;
77 77
78 type->ops->owner = THIS_MODULE; 78 type->ops->owner = THIS_MODULE;
79 if (type->ops_nokey) 79 if (type->ops_nokey)
80 type->ops_nokey->owner = THIS_ 80 type->ops_nokey->owner = THIS_MODULE;
81 node->type = type; 81 node->type = type;
82 list_add(&node->list, &alg_types); 82 list_add(&node->list, &alg_types);
83 err = 0; 83 err = 0;
84 84
85 unlock: 85 unlock:
86 up_write(&alg_types_sem); 86 up_write(&alg_types_sem);
87 87
88 return err; 88 return err;
89 } 89 }
90 EXPORT_SYMBOL_GPL(af_alg_register_type); 90 EXPORT_SYMBOL_GPL(af_alg_register_type);
91 91
92 int af_alg_unregister_type(const struct af_alg 92 int af_alg_unregister_type(const struct af_alg_type *type)
93 { 93 {
94 struct alg_type_list *node; 94 struct alg_type_list *node;
95 int err = -ENOENT; 95 int err = -ENOENT;
96 96
97 down_write(&alg_types_sem); 97 down_write(&alg_types_sem);
98 list_for_each_entry(node, &alg_types, 98 list_for_each_entry(node, &alg_types, list) {
99 if (strcmp(node->type->name, t 99 if (strcmp(node->type->name, type->name))
100 continue; 100 continue;
101 101
102 list_del(&node->list); 102 list_del(&node->list);
103 kfree(node); 103 kfree(node);
104 err = 0; 104 err = 0;
105 break; 105 break;
106 } 106 }
107 up_write(&alg_types_sem); 107 up_write(&alg_types_sem);
108 108
109 return err; 109 return err;
110 } 110 }
111 EXPORT_SYMBOL_GPL(af_alg_unregister_type); 111 EXPORT_SYMBOL_GPL(af_alg_unregister_type);
112 112
113 static void alg_do_release(const struct af_alg 113 static void alg_do_release(const struct af_alg_type *type, void *private)
114 { 114 {
115 if (!type) 115 if (!type)
116 return; 116 return;
117 117
118 type->release(private); 118 type->release(private);
119 module_put(type->owner); 119 module_put(type->owner);
120 } 120 }
121 121
122 int af_alg_release(struct socket *sock) 122 int af_alg_release(struct socket *sock)
123 { 123 {
124 if (sock->sk) { 124 if (sock->sk) {
125 sock_put(sock->sk); 125 sock_put(sock->sk);
126 sock->sk = NULL; 126 sock->sk = NULL;
127 } 127 }
128 return 0; 128 return 0;
129 } 129 }
130 EXPORT_SYMBOL_GPL(af_alg_release); 130 EXPORT_SYMBOL_GPL(af_alg_release);
131 131
132 void af_alg_release_parent(struct sock *sk) 132 void af_alg_release_parent(struct sock *sk)
133 { 133 {
134 struct alg_sock *ask = alg_sk(sk); 134 struct alg_sock *ask = alg_sk(sk);
135 unsigned int nokey = atomic_read(&ask- 135 unsigned int nokey = atomic_read(&ask->nokey_refcnt);
136 136
137 sk = ask->parent; 137 sk = ask->parent;
138 ask = alg_sk(sk); 138 ask = alg_sk(sk);
139 139
140 if (nokey) 140 if (nokey)
141 atomic_dec(&ask->nokey_refcnt) 141 atomic_dec(&ask->nokey_refcnt);
142 142
143 if (atomic_dec_and_test(&ask->refcnt)) 143 if (atomic_dec_and_test(&ask->refcnt))
144 sock_put(sk); 144 sock_put(sk);
145 } 145 }
146 EXPORT_SYMBOL_GPL(af_alg_release_parent); 146 EXPORT_SYMBOL_GPL(af_alg_release_parent);
147 147
148 static int alg_bind(struct socket *sock, struc 148 static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
149 { 149 {
150 const u32 allowed = CRYPTO_ALG_KERN_DR 150 const u32 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY;
151 struct sock *sk = sock->sk; 151 struct sock *sk = sock->sk;
152 struct alg_sock *ask = alg_sk(sk); 152 struct alg_sock *ask = alg_sk(sk);
153 struct sockaddr_alg_new *sa = (void *) 153 struct sockaddr_alg_new *sa = (void *)uaddr;
154 const struct af_alg_type *type; 154 const struct af_alg_type *type;
155 void *private; 155 void *private;
156 int err; 156 int err;
157 157
158 if (sock->state == SS_CONNECTED) 158 if (sock->state == SS_CONNECTED)
159 return -EINVAL; 159 return -EINVAL;
160 160
161 BUILD_BUG_ON(offsetof(struct sockaddr_ 161 BUILD_BUG_ON(offsetof(struct sockaddr_alg_new, salg_name) !=
162 offsetof(struct sockaddr_ 162 offsetof(struct sockaddr_alg, salg_name));
163 BUILD_BUG_ON(offsetof(struct sockaddr_ 163 BUILD_BUG_ON(offsetof(struct sockaddr_alg, salg_name) != sizeof(*sa));
164 164
165 if (addr_len < sizeof(*sa) + 1) 165 if (addr_len < sizeof(*sa) + 1)
166 return -EINVAL; 166 return -EINVAL;
167 167
168 /* If caller uses non-allowed flag, re 168 /* If caller uses non-allowed flag, return error. */
169 if ((sa->salg_feat & ~allowed) || (sa- 169 if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed))
170 return -EINVAL; 170 return -EINVAL;
171 171
172 sa->salg_type[sizeof(sa->salg_type) - 172 sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
173 sa->salg_name[addr_len - sizeof(*sa) - 173 sa->salg_name[addr_len - sizeof(*sa) - 1] = 0;
174 174
175 type = alg_get_type(sa->salg_type); 175 type = alg_get_type(sa->salg_type);
176 if (PTR_ERR(type) == -ENOENT) { 176 if (PTR_ERR(type) == -ENOENT) {
177 request_module("algif-%s", sa- 177 request_module("algif-%s", sa->salg_type);
178 type = alg_get_type(sa->salg_t 178 type = alg_get_type(sa->salg_type);
179 } 179 }
180 180
181 if (IS_ERR(type)) 181 if (IS_ERR(type))
182 return PTR_ERR(type); 182 return PTR_ERR(type);
183 183
184 private = type->bind(sa->salg_name, sa 184 private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask);
185 if (IS_ERR(private)) { 185 if (IS_ERR(private)) {
186 module_put(type->owner); 186 module_put(type->owner);
187 return PTR_ERR(private); 187 return PTR_ERR(private);
188 } 188 }
189 189
190 err = -EBUSY; 190 err = -EBUSY;
191 lock_sock(sk); 191 lock_sock(sk);
192 if (atomic_read(&ask->refcnt)) 192 if (atomic_read(&ask->refcnt))
193 goto unlock; 193 goto unlock;
194 194
195 swap(ask->type, type); 195 swap(ask->type, type);
196 swap(ask->private, private); 196 swap(ask->private, private);
197 197
198 err = 0; 198 err = 0;
199 199
200 unlock: 200 unlock:
201 release_sock(sk); 201 release_sock(sk);
202 202
203 alg_do_release(type, private); 203 alg_do_release(type, private);
204 204
205 return err; 205 return err;
206 } 206 }
207 207
208 static int alg_setkey(struct sock *sk, sockptr 208 static int alg_setkey(struct sock *sk, sockptr_t ukey, unsigned int keylen)
209 { 209 {
210 struct alg_sock *ask = alg_sk(sk); 210 struct alg_sock *ask = alg_sk(sk);
211 const struct af_alg_type *type = ask-> 211 const struct af_alg_type *type = ask->type;
212 u8 *key; 212 u8 *key;
213 int err; 213 int err;
214 214
215 key = sock_kmalloc(sk, keylen, GFP_KER 215 key = sock_kmalloc(sk, keylen, GFP_KERNEL);
216 if (!key) 216 if (!key)
217 return -ENOMEM; 217 return -ENOMEM;
218 218
219 err = -EFAULT; 219 err = -EFAULT;
220 if (copy_from_sockptr(key, ukey, keyle 220 if (copy_from_sockptr(key, ukey, keylen))
221 goto out; 221 goto out;
222 222
223 err = type->setkey(ask->private, key, 223 err = type->setkey(ask->private, key, keylen);
224 224
225 out: 225 out:
226 sock_kzfree_s(sk, key, keylen); 226 sock_kzfree_s(sk, key, keylen);
227 227
228 return err; 228 return err;
229 } 229 }
230 230
231 #ifdef CONFIG_KEYS 231 #ifdef CONFIG_KEYS
232 232
233 static const u8 *key_data_ptr_user(const struc 233 static const u8 *key_data_ptr_user(const struct key *key,
234 unsigned in 234 unsigned int *datalen)
235 { 235 {
236 const struct user_key_payload *ukp; 236 const struct user_key_payload *ukp;
237 237
238 ukp = user_key_payload_locked(key); 238 ukp = user_key_payload_locked(key);
239 if (IS_ERR_OR_NULL(ukp)) 239 if (IS_ERR_OR_NULL(ukp))
240 return ERR_PTR(-EKEYREVOKED); 240 return ERR_PTR(-EKEYREVOKED);
241 241
242 *datalen = key->datalen; 242 *datalen = key->datalen;
243 243
244 return ukp->data; 244 return ukp->data;
245 } 245 }
246 246
247 static const u8 *key_data_ptr_encrypted(const 247 static const u8 *key_data_ptr_encrypted(const struct key *key,
248 unsign 248 unsigned int *datalen)
249 { 249 {
250 const struct encrypted_key_payload *ek 250 const struct encrypted_key_payload *ekp;
251 251
252 ekp = dereference_key_locked(key); 252 ekp = dereference_key_locked(key);
253 if (IS_ERR_OR_NULL(ekp)) 253 if (IS_ERR_OR_NULL(ekp))
254 return ERR_PTR(-EKEYREVOKED); 254 return ERR_PTR(-EKEYREVOKED);
255 255
256 *datalen = ekp->decrypted_datalen; 256 *datalen = ekp->decrypted_datalen;
257 257
258 return ekp->decrypted_data; 258 return ekp->decrypted_data;
259 } 259 }
260 260
261 static const u8 *key_data_ptr_trusted(const st 261 static const u8 *key_data_ptr_trusted(const struct key *key,
262 unsigned 262 unsigned int *datalen)
263 { 263 {
264 const struct trusted_key_payload *tkp; 264 const struct trusted_key_payload *tkp;
265 265
266 tkp = dereference_key_locked(key); 266 tkp = dereference_key_locked(key);
267 if (IS_ERR_OR_NULL(tkp)) 267 if (IS_ERR_OR_NULL(tkp))
268 return ERR_PTR(-EKEYREVOKED); 268 return ERR_PTR(-EKEYREVOKED);
269 269
270 *datalen = tkp->key_len; 270 *datalen = tkp->key_len;
271 271
272 return tkp->key; 272 return tkp->key;
273 } 273 }
274 274
275 static struct key *lookup_key(key_serial_t ser 275 static struct key *lookup_key(key_serial_t serial)
276 { 276 {
277 key_ref_t key_ref; 277 key_ref_t key_ref;
278 278
279 key_ref = lookup_user_key(serial, 0, K 279 key_ref = lookup_user_key(serial, 0, KEY_NEED_SEARCH);
280 if (IS_ERR(key_ref)) 280 if (IS_ERR(key_ref))
281 return ERR_CAST(key_ref); 281 return ERR_CAST(key_ref);
282 282
283 return key_ref_to_ptr(key_ref); 283 return key_ref_to_ptr(key_ref);
284 } 284 }
285 285
286 static int alg_setkey_by_key_serial(struct alg 286 static int alg_setkey_by_key_serial(struct alg_sock *ask, sockptr_t optval,
287 unsigned i 287 unsigned int optlen)
288 { 288 {
289 const struct af_alg_type *type = ask-> 289 const struct af_alg_type *type = ask->type;
290 u8 *key_data = NULL; 290 u8 *key_data = NULL;
291 unsigned int key_datalen; 291 unsigned int key_datalen;
292 key_serial_t serial; 292 key_serial_t serial;
293 struct key *key; 293 struct key *key;
294 const u8 *ret; 294 const u8 *ret;
295 int err; 295 int err;
296 296
297 if (optlen != sizeof(serial)) 297 if (optlen != sizeof(serial))
298 return -EINVAL; 298 return -EINVAL;
299 299
300 if (copy_from_sockptr(&serial, optval, 300 if (copy_from_sockptr(&serial, optval, optlen))
301 return -EFAULT; 301 return -EFAULT;
302 302
303 key = lookup_key(serial); 303 key = lookup_key(serial);
304 if (IS_ERR(key)) 304 if (IS_ERR(key))
305 return PTR_ERR(key); 305 return PTR_ERR(key);
306 306
307 down_read(&key->sem); 307 down_read(&key->sem);
308 308
309 ret = ERR_PTR(-ENOPROTOOPT); 309 ret = ERR_PTR(-ENOPROTOOPT);
310 if (!strcmp(key->type->name, "user") | 310 if (!strcmp(key->type->name, "user") ||
311 !strcmp(key->type->name, "logon")) 311 !strcmp(key->type->name, "logon")) {
312 ret = key_data_ptr_user(key, & 312 ret = key_data_ptr_user(key, &key_datalen);
313 } else if (IS_REACHABLE(CONFIG_ENCRYPT 313 } else if (IS_REACHABLE(CONFIG_ENCRYPTED_KEYS) &&
314 !strcmp(key->type-> 314 !strcmp(key->type->name, "encrypted")) {
315 ret = key_data_ptr_encrypted(k 315 ret = key_data_ptr_encrypted(key, &key_datalen);
316 } else if (IS_REACHABLE(CONFIG_TRUSTED 316 } else if (IS_REACHABLE(CONFIG_TRUSTED_KEYS) &&
317 !strcmp(key->type-> 317 !strcmp(key->type->name, "trusted")) {
318 ret = key_data_ptr_trusted(key 318 ret = key_data_ptr_trusted(key, &key_datalen);
319 } 319 }
320 320
321 if (IS_ERR(ret)) { 321 if (IS_ERR(ret)) {
322 up_read(&key->sem); 322 up_read(&key->sem);
323 key_put(key); 323 key_put(key);
324 return PTR_ERR(ret); 324 return PTR_ERR(ret);
325 } 325 }
326 326
327 key_data = sock_kmalloc(&ask->sk, key_ 327 key_data = sock_kmalloc(&ask->sk, key_datalen, GFP_KERNEL);
328 if (!key_data) { 328 if (!key_data) {
329 up_read(&key->sem); 329 up_read(&key->sem);
330 key_put(key); 330 key_put(key);
331 return -ENOMEM; 331 return -ENOMEM;
332 } 332 }
333 333
334 memcpy(key_data, ret, key_datalen); 334 memcpy(key_data, ret, key_datalen);
335 335
336 up_read(&key->sem); 336 up_read(&key->sem);
337 key_put(key); 337 key_put(key);
338 338
339 err = type->setkey(ask->private, key_d 339 err = type->setkey(ask->private, key_data, key_datalen);
340 340
341 sock_kzfree_s(&ask->sk, key_data, key_ 341 sock_kzfree_s(&ask->sk, key_data, key_datalen);
342 342
343 return err; 343 return err;
344 } 344 }
345 345
346 #else 346 #else
347 347
348 static inline int alg_setkey_by_key_serial(str 348 static inline int alg_setkey_by_key_serial(struct alg_sock *ask,
349 soc 349 sockptr_t optval,
350 uns 350 unsigned int optlen)
351 { 351 {
352 return -ENOPROTOOPT; 352 return -ENOPROTOOPT;
353 } 353 }
354 354
355 #endif 355 #endif
356 356
357 static int alg_setsockopt(struct socket *sock, 357 static int alg_setsockopt(struct socket *sock, int level, int optname,
358 sockptr_t optval, un 358 sockptr_t optval, unsigned int optlen)
359 { 359 {
360 struct sock *sk = sock->sk; 360 struct sock *sk = sock->sk;
361 struct alg_sock *ask = alg_sk(sk); 361 struct alg_sock *ask = alg_sk(sk);
362 const struct af_alg_type *type; 362 const struct af_alg_type *type;
363 int err = -EBUSY; 363 int err = -EBUSY;
364 364
365 lock_sock(sk); 365 lock_sock(sk);
366 if (atomic_read(&ask->refcnt) != atomi 366 if (atomic_read(&ask->refcnt) != atomic_read(&ask->nokey_refcnt))
367 goto unlock; 367 goto unlock;
368 368
369 type = ask->type; 369 type = ask->type;
370 370
371 err = -ENOPROTOOPT; 371 err = -ENOPROTOOPT;
372 if (level != SOL_ALG || !type) 372 if (level != SOL_ALG || !type)
373 goto unlock; 373 goto unlock;
374 374
375 switch (optname) { 375 switch (optname) {
376 case ALG_SET_KEY: 376 case ALG_SET_KEY:
377 case ALG_SET_KEY_BY_KEY_SERIAL: 377 case ALG_SET_KEY_BY_KEY_SERIAL:
378 if (sock->state == SS_CONNECTE 378 if (sock->state == SS_CONNECTED)
379 goto unlock; 379 goto unlock;
380 if (!type->setkey) 380 if (!type->setkey)
381 goto unlock; 381 goto unlock;
382 382
383 if (optname == ALG_SET_KEY_BY_ 383 if (optname == ALG_SET_KEY_BY_KEY_SERIAL)
384 err = alg_setkey_by_ke 384 err = alg_setkey_by_key_serial(ask, optval, optlen);
385 else 385 else
386 err = alg_setkey(sk, o 386 err = alg_setkey(sk, optval, optlen);
387 break; 387 break;
388 case ALG_SET_AEAD_AUTHSIZE: 388 case ALG_SET_AEAD_AUTHSIZE:
389 if (sock->state == SS_CONNECTE 389 if (sock->state == SS_CONNECTED)
390 goto unlock; 390 goto unlock;
391 if (!type->setauthsize) 391 if (!type->setauthsize)
392 goto unlock; 392 goto unlock;
393 err = type->setauthsize(ask->p 393 err = type->setauthsize(ask->private, optlen);
394 break; 394 break;
395 case ALG_SET_DRBG_ENTROPY: 395 case ALG_SET_DRBG_ENTROPY:
396 if (sock->state == SS_CONNECTE 396 if (sock->state == SS_CONNECTED)
397 goto unlock; 397 goto unlock;
398 if (!type->setentropy) 398 if (!type->setentropy)
399 goto unlock; 399 goto unlock;
400 400
401 err = type->setentropy(ask->pr 401 err = type->setentropy(ask->private, optval, optlen);
402 } 402 }
403 403
404 unlock: 404 unlock:
405 release_sock(sk); 405 release_sock(sk);
406 406
407 return err; 407 return err;
408 } 408 }
409 409
410 int af_alg_accept(struct sock *sk, struct sock !! 410 int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern)
411 struct proto_accept_arg *arg <<
412 { 411 {
413 struct alg_sock *ask = alg_sk(sk); 412 struct alg_sock *ask = alg_sk(sk);
414 const struct af_alg_type *type; 413 const struct af_alg_type *type;
415 struct sock *sk2; 414 struct sock *sk2;
416 unsigned int nokey; 415 unsigned int nokey;
417 int err; 416 int err;
418 417
419 lock_sock(sk); 418 lock_sock(sk);
420 type = ask->type; 419 type = ask->type;
421 420
422 err = -EINVAL; 421 err = -EINVAL;
423 if (!type) 422 if (!type)
424 goto unlock; 423 goto unlock;
425 424
426 sk2 = sk_alloc(sock_net(sk), PF_ALG, G !! 425 sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern);
427 err = -ENOMEM; 426 err = -ENOMEM;
428 if (!sk2) 427 if (!sk2)
429 goto unlock; 428 goto unlock;
430 429
431 sock_init_data(newsock, sk2); 430 sock_init_data(newsock, sk2);
432 security_sock_graft(sk2, newsock); 431 security_sock_graft(sk2, newsock);
433 security_sk_clone(sk, sk2); 432 security_sk_clone(sk, sk2);
434 433
435 /* 434 /*
436 * newsock->ops assigned here to allow 435 * newsock->ops assigned here to allow type->accept call to override
437 * them when required. 436 * them when required.
438 */ 437 */
439 newsock->ops = type->ops; 438 newsock->ops = type->ops;
440 err = type->accept(ask->private, sk2); 439 err = type->accept(ask->private, sk2);
441 440
442 nokey = err == -ENOKEY; 441 nokey = err == -ENOKEY;
443 if (nokey && type->accept_nokey) 442 if (nokey && type->accept_nokey)
444 err = type->accept_nokey(ask-> 443 err = type->accept_nokey(ask->private, sk2);
445 444
446 if (err) 445 if (err)
447 goto unlock; 446 goto unlock;
448 447
449 if (atomic_inc_return_relaxed(&ask->re 448 if (atomic_inc_return_relaxed(&ask->refcnt) == 1)
450 sock_hold(sk); 449 sock_hold(sk);
451 if (nokey) { 450 if (nokey) {
452 atomic_inc(&ask->nokey_refcnt) 451 atomic_inc(&ask->nokey_refcnt);
453 atomic_set(&alg_sk(sk2)->nokey 452 atomic_set(&alg_sk(sk2)->nokey_refcnt, 1);
454 } 453 }
455 alg_sk(sk2)->parent = sk; 454 alg_sk(sk2)->parent = sk;
456 alg_sk(sk2)->type = type; 455 alg_sk(sk2)->type = type;
457 456
458 newsock->state = SS_CONNECTED; 457 newsock->state = SS_CONNECTED;
459 458
460 if (nokey) 459 if (nokey)
461 newsock->ops = type->ops_nokey 460 newsock->ops = type->ops_nokey;
462 461
463 err = 0; 462 err = 0;
464 463
465 unlock: 464 unlock:
466 release_sock(sk); 465 release_sock(sk);
467 466
468 return err; 467 return err;
469 } 468 }
470 EXPORT_SYMBOL_GPL(af_alg_accept); 469 EXPORT_SYMBOL_GPL(af_alg_accept);
471 470
472 static int alg_accept(struct socket *sock, str !! 471 static int alg_accept(struct socket *sock, struct socket *newsock, int flags,
473 struct proto_accept_arg !! 472 bool kern)
474 { 473 {
475 return af_alg_accept(sock->sk, newsock !! 474 return af_alg_accept(sock->sk, newsock, kern);
476 } 475 }
477 476
478 static const struct proto_ops alg_proto_ops = 477 static const struct proto_ops alg_proto_ops = {
479 .family = PF_ALG, 478 .family = PF_ALG,
480 .owner = THIS_MODULE, 479 .owner = THIS_MODULE,
481 480
482 .connect = sock_no_connec 481 .connect = sock_no_connect,
483 .socketpair = sock_no_socket 482 .socketpair = sock_no_socketpair,
484 .getname = sock_no_getnam 483 .getname = sock_no_getname,
485 .ioctl = sock_no_ioctl, 484 .ioctl = sock_no_ioctl,
486 .listen = sock_no_listen 485 .listen = sock_no_listen,
487 .shutdown = sock_no_shutdo 486 .shutdown = sock_no_shutdown,
488 .mmap = sock_no_mmap, 487 .mmap = sock_no_mmap,
489 .sendmsg = sock_no_sendms 488 .sendmsg = sock_no_sendmsg,
490 .recvmsg = sock_no_recvms 489 .recvmsg = sock_no_recvmsg,
491 490
492 .bind = alg_bind, 491 .bind = alg_bind,
493 .release = af_alg_release 492 .release = af_alg_release,
494 .setsockopt = alg_setsockopt 493 .setsockopt = alg_setsockopt,
495 .accept = alg_accept, 494 .accept = alg_accept,
496 }; 495 };
497 496
498 static void alg_sock_destruct(struct sock *sk) 497 static void alg_sock_destruct(struct sock *sk)
499 { 498 {
500 struct alg_sock *ask = alg_sk(sk); 499 struct alg_sock *ask = alg_sk(sk);
501 500
502 alg_do_release(ask->type, ask->private 501 alg_do_release(ask->type, ask->private);
503 } 502 }
504 503
505 static int alg_create(struct net *net, struct 504 static int alg_create(struct net *net, struct socket *sock, int protocol,
506 int kern) 505 int kern)
507 { 506 {
508 struct sock *sk; 507 struct sock *sk;
509 int err; 508 int err;
510 509
511 if (sock->type != SOCK_SEQPACKET) 510 if (sock->type != SOCK_SEQPACKET)
512 return -ESOCKTNOSUPPORT; 511 return -ESOCKTNOSUPPORT;
513 if (protocol != 0) 512 if (protocol != 0)
514 return -EPROTONOSUPPORT; 513 return -EPROTONOSUPPORT;
515 514
516 err = -ENOMEM; 515 err = -ENOMEM;
517 sk = sk_alloc(net, PF_ALG, GFP_KERNEL, 516 sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern);
518 if (!sk) 517 if (!sk)
519 goto out; 518 goto out;
520 519
521 sock->ops = &alg_proto_ops; 520 sock->ops = &alg_proto_ops;
522 sock_init_data(sock, sk); 521 sock_init_data(sock, sk);
523 522
524 sk->sk_destruct = alg_sock_destruct; 523 sk->sk_destruct = alg_sock_destruct;
525 524
526 return 0; 525 return 0;
527 out: 526 out:
528 return err; 527 return err;
529 } 528 }
530 529
531 static const struct net_proto_family alg_famil 530 static const struct net_proto_family alg_family = {
532 .family = PF_ALG, 531 .family = PF_ALG,
533 .create = alg_create, 532 .create = alg_create,
534 .owner = THIS_MODULE, 533 .owner = THIS_MODULE,
535 }; 534 };
536 535
537 static void af_alg_link_sg(struct af_alg_sgl * 536 static void af_alg_link_sg(struct af_alg_sgl *sgl_prev,
538 struct af_alg_sgl * 537 struct af_alg_sgl *sgl_new)
539 { 538 {
540 sg_unmark_end(sgl_prev->sgt.sgl + sgl_ 539 sg_unmark_end(sgl_prev->sgt.sgl + sgl_prev->sgt.nents - 1);
541 sg_chain(sgl_prev->sgt.sgl, sgl_prev-> 540 sg_chain(sgl_prev->sgt.sgl, sgl_prev->sgt.nents + 1, sgl_new->sgt.sgl);
542 } 541 }
543 542
544 void af_alg_free_sg(struct af_alg_sgl *sgl) 543 void af_alg_free_sg(struct af_alg_sgl *sgl)
545 { 544 {
546 int i; 545 int i;
547 546
548 if (sgl->sgt.sgl) { 547 if (sgl->sgt.sgl) {
549 if (sgl->need_unpin) 548 if (sgl->need_unpin)
550 for (i = 0; i < sgl->s 549 for (i = 0; i < sgl->sgt.nents; i++)
551 unpin_user_pag 550 unpin_user_page(sg_page(&sgl->sgt.sgl[i]));
552 if (sgl->sgt.sgl != sgl->sgl) 551 if (sgl->sgt.sgl != sgl->sgl)
553 kvfree(sgl->sgt.sgl); 552 kvfree(sgl->sgt.sgl);
554 sgl->sgt.sgl = NULL; 553 sgl->sgt.sgl = NULL;
555 } 554 }
556 } 555 }
557 EXPORT_SYMBOL_GPL(af_alg_free_sg); 556 EXPORT_SYMBOL_GPL(af_alg_free_sg);
558 557
559 static int af_alg_cmsg_send(struct msghdr *msg 558 static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
560 { 559 {
561 struct cmsghdr *cmsg; 560 struct cmsghdr *cmsg;
562 561
563 for_each_cmsghdr(cmsg, msg) { 562 for_each_cmsghdr(cmsg, msg) {
564 if (!CMSG_OK(msg, cmsg)) 563 if (!CMSG_OK(msg, cmsg))
565 return -EINVAL; 564 return -EINVAL;
566 if (cmsg->cmsg_level != SOL_AL 565 if (cmsg->cmsg_level != SOL_ALG)
567 continue; 566 continue;
568 567
569 switch (cmsg->cmsg_type) { 568 switch (cmsg->cmsg_type) {
570 case ALG_SET_IV: 569 case ALG_SET_IV:
571 if (cmsg->cmsg_len < C 570 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
572 return -EINVAL 571 return -EINVAL;
573 con->iv = (void *)CMSG 572 con->iv = (void *)CMSG_DATA(cmsg);
574 if (cmsg->cmsg_len < C 573 if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
575 574 sizeof(*con->iv)))
576 return -EINVAL 575 return -EINVAL;
577 break; 576 break;
578 577
579 case ALG_SET_OP: 578 case ALG_SET_OP:
580 if (cmsg->cmsg_len < C 579 if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
581 return -EINVAL 580 return -EINVAL;
582 con->op = *(u32 *)CMSG 581 con->op = *(u32 *)CMSG_DATA(cmsg);
583 break; 582 break;
584 583
585 case ALG_SET_AEAD_ASSOCLEN: 584 case ALG_SET_AEAD_ASSOCLEN:
586 if (cmsg->cmsg_len < C 585 if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
587 return -EINVAL 586 return -EINVAL;
588 con->aead_assoclen = * 587 con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
589 break; 588 break;
590 589
591 default: 590 default:
592 return -EINVAL; 591 return -EINVAL;
593 } 592 }
594 } 593 }
595 594
596 return 0; 595 return 0;
597 } 596 }
598 597
599 /** 598 /**
600 * af_alg_alloc_tsgl - allocate the TX SGL 599 * af_alg_alloc_tsgl - allocate the TX SGL
601 * 600 *
602 * @sk: socket of connection to user space 601 * @sk: socket of connection to user space
603 * Return: 0 upon success, < 0 upon error 602 * Return: 0 upon success, < 0 upon error
604 */ 603 */
605 static int af_alg_alloc_tsgl(struct sock *sk) 604 static int af_alg_alloc_tsgl(struct sock *sk)
606 { 605 {
607 struct alg_sock *ask = alg_sk(sk); 606 struct alg_sock *ask = alg_sk(sk);
608 struct af_alg_ctx *ctx = ask->private; 607 struct af_alg_ctx *ctx = ask->private;
609 struct af_alg_tsgl *sgl; 608 struct af_alg_tsgl *sgl;
610 struct scatterlist *sg = NULL; 609 struct scatterlist *sg = NULL;
611 610
612 sgl = list_entry(ctx->tsgl_list.prev, 611 sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list);
613 if (!list_empty(&ctx->tsgl_list)) 612 if (!list_empty(&ctx->tsgl_list))
614 sg = sgl->sg; 613 sg = sgl->sg;
615 614
616 if (!sg || sgl->cur >= MAX_SGL_ENTS) { 615 if (!sg || sgl->cur >= MAX_SGL_ENTS) {
617 sgl = sock_kmalloc(sk, 616 sgl = sock_kmalloc(sk,
618 struct_size 617 struct_size(sgl, sg, (MAX_SGL_ENTS + 1)),
619 GFP_KERNEL) 618 GFP_KERNEL);
620 if (!sgl) 619 if (!sgl)
621 return -ENOMEM; 620 return -ENOMEM;
622 621
623 sg_init_table(sgl->sg, MAX_SGL 622 sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
624 sgl->cur = 0; 623 sgl->cur = 0;
625 624
626 if (sg) 625 if (sg)
627 sg_chain(sg, MAX_SGL_E 626 sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
628 627
629 list_add_tail(&sgl->list, &ctx 628 list_add_tail(&sgl->list, &ctx->tsgl_list);
630 } 629 }
631 630
632 return 0; 631 return 0;
633 } 632 }
634 633
635 /** 634 /**
636 * af_alg_count_tsgl - Count number of TX SG e 635 * af_alg_count_tsgl - Count number of TX SG entries
637 * 636 *
638 * The counting starts from the beginning of t 637 * The counting starts from the beginning of the SGL to @bytes. If
639 * an @offset is provided, the counting of the 638 * an @offset is provided, the counting of the SG entries starts at the @offset.
640 * 639 *
641 * @sk: socket of connection to user space 640 * @sk: socket of connection to user space
642 * @bytes: Count the number of SG entries hold 641 * @bytes: Count the number of SG entries holding given number of bytes.
643 * @offset: Start the counting of SG entries f 642 * @offset: Start the counting of SG entries from the given offset.
644 * Return: Number of TX SG entries found given 643 * Return: Number of TX SG entries found given the constraints
645 */ 644 */
646 unsigned int af_alg_count_tsgl(struct sock *sk 645 unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset)
647 { 646 {
648 const struct alg_sock *ask = alg_sk(sk 647 const struct alg_sock *ask = alg_sk(sk);
649 const struct af_alg_ctx *ctx = ask->pr 648 const struct af_alg_ctx *ctx = ask->private;
650 const struct af_alg_tsgl *sgl; 649 const struct af_alg_tsgl *sgl;
651 unsigned int i; 650 unsigned int i;
652 unsigned int sgl_count = 0; 651 unsigned int sgl_count = 0;
653 652
654 if (!bytes) 653 if (!bytes)
655 return 0; 654 return 0;
656 655
657 list_for_each_entry(sgl, &ctx->tsgl_li 656 list_for_each_entry(sgl, &ctx->tsgl_list, list) {
658 const struct scatterlist *sg = 657 const struct scatterlist *sg = sgl->sg;
659 658
660 for (i = 0; i < sgl->cur; i++) 659 for (i = 0; i < sgl->cur; i++) {
661 size_t bytes_count; 660 size_t bytes_count;
662 661
663 /* Skip offset */ 662 /* Skip offset */
664 if (offset >= sg[i].le 663 if (offset >= sg[i].length) {
665 offset -= sg[i 664 offset -= sg[i].length;
666 bytes -= sg[i] 665 bytes -= sg[i].length;
667 continue; 666 continue;
668 } 667 }
669 668
670 bytes_count = sg[i].le 669 bytes_count = sg[i].length - offset;
671 670
672 offset = 0; 671 offset = 0;
673 sgl_count++; 672 sgl_count++;
674 673
675 /* If we have seen req 674 /* If we have seen requested number of bytes, stop */
676 if (bytes_count >= byt 675 if (bytes_count >= bytes)
677 return sgl_cou 676 return sgl_count;
678 677
679 bytes -= bytes_count; 678 bytes -= bytes_count;
680 } 679 }
681 } 680 }
682 681
683 return sgl_count; 682 return sgl_count;
684 } 683 }
685 EXPORT_SYMBOL_GPL(af_alg_count_tsgl); 684 EXPORT_SYMBOL_GPL(af_alg_count_tsgl);
686 685
687 /** 686 /**
688 * af_alg_pull_tsgl - Release the specified bu 687 * af_alg_pull_tsgl - Release the specified buffers from TX SGL
689 * 688 *
690 * If @dst is non-null, reassign the pages to 689 * If @dst is non-null, reassign the pages to @dst. The caller must release
691 * the pages. If @dst_offset is given only rea 690 * the pages. If @dst_offset is given only reassign the pages to @dst starting
692 * at the @dst_offset (byte). The caller must 691 * at the @dst_offset (byte). The caller must ensure that @dst is large
693 * enough (e.g. by using af_alg_count_tsgl wit 692 * enough (e.g. by using af_alg_count_tsgl with the same offset).
694 * 693 *
695 * @sk: socket of connection to user space 694 * @sk: socket of connection to user space
696 * @used: Number of bytes to pull from TX SGL 695 * @used: Number of bytes to pull from TX SGL
697 * @dst: If non-NULL, buffer is reassigned to 696 * @dst: If non-NULL, buffer is reassigned to dst SGL instead of releasing. The
698 * caller must release the buffers in ds 697 * caller must release the buffers in dst.
699 * @dst_offset: Reassign the TX SGL from given 698 * @dst_offset: Reassign the TX SGL from given offset. All buffers before
700 * reaching the offset is release 699 * reaching the offset is released.
701 */ 700 */
702 void af_alg_pull_tsgl(struct sock *sk, size_t 701 void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst,
703 size_t dst_offset) 702 size_t dst_offset)
704 { 703 {
705 struct alg_sock *ask = alg_sk(sk); 704 struct alg_sock *ask = alg_sk(sk);
706 struct af_alg_ctx *ctx = ask->private; 705 struct af_alg_ctx *ctx = ask->private;
707 struct af_alg_tsgl *sgl; 706 struct af_alg_tsgl *sgl;
708 struct scatterlist *sg; 707 struct scatterlist *sg;
709 unsigned int i, j = 0; 708 unsigned int i, j = 0;
710 709
711 while (!list_empty(&ctx->tsgl_list)) { 710 while (!list_empty(&ctx->tsgl_list)) {
712 sgl = list_first_entry(&ctx->t 711 sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl,
713 list); 712 list);
714 sg = sgl->sg; 713 sg = sgl->sg;
715 714
716 for (i = 0; i < sgl->cur; i++) 715 for (i = 0; i < sgl->cur; i++) {
717 size_t plen = min_t(si 716 size_t plen = min_t(size_t, used, sg[i].length);
718 struct page *page = sg 717 struct page *page = sg_page(sg + i);
719 718
720 if (!page) 719 if (!page)
721 continue; 720 continue;
722 721
723 /* 722 /*
724 * Assumption: caller 723 * Assumption: caller created af_alg_count_tsgl(len)
725 * SG entries in dst. 724 * SG entries in dst.
726 */ 725 */
727 if (dst) { 726 if (dst) {
728 if (dst_offset 727 if (dst_offset >= plen) {
729 /* dis 728 /* discard page before offset */
730 dst_of 729 dst_offset -= plen;
731 } else { 730 } else {
732 /* rea 731 /* reassign page to dst after offset */
733 get_pa 732 get_page(page);
734 sg_set 733 sg_set_page(dst + j, page,
735 734 plen - dst_offset,
736 735 sg[i].offset + dst_offset);
737 dst_of 736 dst_offset = 0;
738 j++; 737 j++;
739 } 738 }
740 } 739 }
741 740
742 sg[i].length -= plen; 741 sg[i].length -= plen;
743 sg[i].offset += plen; 742 sg[i].offset += plen;
744 743
745 used -= plen; 744 used -= plen;
746 ctx->used -= plen; 745 ctx->used -= plen;
747 746
748 if (sg[i].length) 747 if (sg[i].length)
749 return; 748 return;
750 749
751 put_page(page); 750 put_page(page);
752 sg_assign_page(sg + i, 751 sg_assign_page(sg + i, NULL);
753 } 752 }
754 753
755 list_del(&sgl->list); 754 list_del(&sgl->list);
756 sock_kfree_s(sk, sgl, struct_s 755 sock_kfree_s(sk, sgl, struct_size(sgl, sg, MAX_SGL_ENTS + 1));
757 } 756 }
758 757
759 if (!ctx->used) 758 if (!ctx->used)
760 ctx->merge = 0; 759 ctx->merge = 0;
761 ctx->init = ctx->more; 760 ctx->init = ctx->more;
762 } 761 }
763 EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); 762 EXPORT_SYMBOL_GPL(af_alg_pull_tsgl);
764 763
765 /** 764 /**
766 * af_alg_free_areq_sgls - Release TX and RX S 765 * af_alg_free_areq_sgls - Release TX and RX SGLs of the request
767 * 766 *
768 * @areq: Request holding the TX and RX SGL 767 * @areq: Request holding the TX and RX SGL
769 */ 768 */
770 static void af_alg_free_areq_sgls(struct af_al 769 static void af_alg_free_areq_sgls(struct af_alg_async_req *areq)
771 { 770 {
772 struct sock *sk = areq->sk; 771 struct sock *sk = areq->sk;
773 struct alg_sock *ask = alg_sk(sk); 772 struct alg_sock *ask = alg_sk(sk);
774 struct af_alg_ctx *ctx = ask->private; 773 struct af_alg_ctx *ctx = ask->private;
775 struct af_alg_rsgl *rsgl, *tmp; 774 struct af_alg_rsgl *rsgl, *tmp;
776 struct scatterlist *tsgl; 775 struct scatterlist *tsgl;
777 struct scatterlist *sg; 776 struct scatterlist *sg;
778 unsigned int i; 777 unsigned int i;
779 778
780 list_for_each_entry_safe(rsgl, tmp, &a 779 list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) {
781 atomic_sub(rsgl->sg_num_bytes, 780 atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused);
782 af_alg_free_sg(&rsgl->sgl); 781 af_alg_free_sg(&rsgl->sgl);
783 list_del(&rsgl->list); 782 list_del(&rsgl->list);
784 if (rsgl != &areq->first_rsgl) 783 if (rsgl != &areq->first_rsgl)
785 sock_kfree_s(sk, rsgl, 784 sock_kfree_s(sk, rsgl, sizeof(*rsgl));
786 } 785 }
787 786
788 tsgl = areq->tsgl; 787 tsgl = areq->tsgl;
789 if (tsgl) { 788 if (tsgl) {
790 for_each_sg(tsgl, sg, areq->ts 789 for_each_sg(tsgl, sg, areq->tsgl_entries, i) {
791 if (!sg_page(sg)) 790 if (!sg_page(sg))
792 continue; 791 continue;
793 put_page(sg_page(sg)); 792 put_page(sg_page(sg));
794 } 793 }
795 794
796 sock_kfree_s(sk, tsgl, areq->t 795 sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl));
797 } 796 }
798 } 797 }
799 798
800 /** 799 /**
801 * af_alg_wait_for_wmem - wait for availabilit 800 * af_alg_wait_for_wmem - wait for availability of writable memory
802 * 801 *
803 * @sk: socket of connection to user space 802 * @sk: socket of connection to user space
804 * @flags: If MSG_DONTWAIT is set, then only r 803 * @flags: If MSG_DONTWAIT is set, then only report if function would sleep
805 * Return: 0 when writable memory is available 804 * Return: 0 when writable memory is available, < 0 upon error
806 */ 805 */
807 static int af_alg_wait_for_wmem(struct sock *s 806 static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags)
808 { 807 {
809 DEFINE_WAIT_FUNC(wait, woken_wake_func 808 DEFINE_WAIT_FUNC(wait, woken_wake_function);
810 int err = -ERESTARTSYS; 809 int err = -ERESTARTSYS;
811 long timeout; 810 long timeout;
812 811
813 if (flags & MSG_DONTWAIT) 812 if (flags & MSG_DONTWAIT)
814 return -EAGAIN; 813 return -EAGAIN;
815 814
816 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 815 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
817 816
818 add_wait_queue(sk_sleep(sk), &wait); 817 add_wait_queue(sk_sleep(sk), &wait);
819 for (;;) { 818 for (;;) {
820 if (signal_pending(current)) 819 if (signal_pending(current))
821 break; 820 break;
822 timeout = MAX_SCHEDULE_TIMEOUT 821 timeout = MAX_SCHEDULE_TIMEOUT;
823 if (sk_wait_event(sk, &timeout 822 if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) {
824 err = 0; 823 err = 0;
825 break; 824 break;
826 } 825 }
827 } 826 }
828 remove_wait_queue(sk_sleep(sk), &wait) 827 remove_wait_queue(sk_sleep(sk), &wait);
829 828
830 return err; 829 return err;
831 } 830 }
832 831
833 /** 832 /**
834 * af_alg_wmem_wakeup - wakeup caller when wri 833 * af_alg_wmem_wakeup - wakeup caller when writable memory is available
835 * 834 *
836 * @sk: socket of connection to user space 835 * @sk: socket of connection to user space
837 */ 836 */
838 void af_alg_wmem_wakeup(struct sock *sk) 837 void af_alg_wmem_wakeup(struct sock *sk)
839 { 838 {
840 struct socket_wq *wq; 839 struct socket_wq *wq;
841 840
842 if (!af_alg_writable(sk)) 841 if (!af_alg_writable(sk))
843 return; 842 return;
844 843
845 rcu_read_lock(); 844 rcu_read_lock();
846 wq = rcu_dereference(sk->sk_wq); 845 wq = rcu_dereference(sk->sk_wq);
847 if (skwq_has_sleeper(wq)) 846 if (skwq_has_sleeper(wq))
848 wake_up_interruptible_sync_pol 847 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
849 848 EPOLLRDNORM |
850 849 EPOLLRDBAND);
851 sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, !! 850 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
852 rcu_read_unlock(); 851 rcu_read_unlock();
853 } 852 }
854 EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); 853 EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup);
855 854
856 /** 855 /**
857 * af_alg_wait_for_data - wait for availabilit 856 * af_alg_wait_for_data - wait for availability of TX data
858 * 857 *
859 * @sk: socket of connection to user space 858 * @sk: socket of connection to user space
860 * @flags: If MSG_DONTWAIT is set, then only r 859 * @flags: If MSG_DONTWAIT is set, then only report if function would sleep
861 * @min: Set to minimum request size if partia 860 * @min: Set to minimum request size if partial requests are allowed.
862 * Return: 0 when writable memory is available 861 * Return: 0 when writable memory is available, < 0 upon error
863 */ 862 */
864 int af_alg_wait_for_data(struct sock *sk, unsi 863 int af_alg_wait_for_data(struct sock *sk, unsigned flags, unsigned min)
865 { 864 {
866 DEFINE_WAIT_FUNC(wait, woken_wake_func 865 DEFINE_WAIT_FUNC(wait, woken_wake_function);
867 struct alg_sock *ask = alg_sk(sk); 866 struct alg_sock *ask = alg_sk(sk);
868 struct af_alg_ctx *ctx = ask->private; 867 struct af_alg_ctx *ctx = ask->private;
869 long timeout; 868 long timeout;
870 int err = -ERESTARTSYS; 869 int err = -ERESTARTSYS;
871 870
872 if (flags & MSG_DONTWAIT) 871 if (flags & MSG_DONTWAIT)
873 return -EAGAIN; 872 return -EAGAIN;
874 873
875 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); 874 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
876 875
877 add_wait_queue(sk_sleep(sk), &wait); 876 add_wait_queue(sk_sleep(sk), &wait);
878 for (;;) { 877 for (;;) {
879 if (signal_pending(current)) 878 if (signal_pending(current))
880 break; 879 break;
881 timeout = MAX_SCHEDULE_TIMEOUT 880 timeout = MAX_SCHEDULE_TIMEOUT;
882 if (sk_wait_event(sk, &timeout 881 if (sk_wait_event(sk, &timeout,
883 ctx->init && 882 ctx->init && (!ctx->more ||
884 883 (min && ctx->used >= min)),
885 &wait)) { 884 &wait)) {
886 err = 0; 885 err = 0;
887 break; 886 break;
888 } 887 }
889 } 888 }
890 remove_wait_queue(sk_sleep(sk), &wait) 889 remove_wait_queue(sk_sleep(sk), &wait);
891 890
892 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk 891 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
893 892
894 return err; 893 return err;
895 } 894 }
896 EXPORT_SYMBOL_GPL(af_alg_wait_for_data); 895 EXPORT_SYMBOL_GPL(af_alg_wait_for_data);
897 896
898 /** 897 /**
899 * af_alg_data_wakeup - wakeup caller when new 898 * af_alg_data_wakeup - wakeup caller when new data can be sent to kernel
900 * 899 *
901 * @sk: socket of connection to user space 900 * @sk: socket of connection to user space
902 */ 901 */
903 static void af_alg_data_wakeup(struct sock *sk 902 static void af_alg_data_wakeup(struct sock *sk)
904 { 903 {
905 struct alg_sock *ask = alg_sk(sk); 904 struct alg_sock *ask = alg_sk(sk);
906 struct af_alg_ctx *ctx = ask->private; 905 struct af_alg_ctx *ctx = ask->private;
907 struct socket_wq *wq; 906 struct socket_wq *wq;
908 907
909 if (!ctx->used) 908 if (!ctx->used)
910 return; 909 return;
911 910
912 rcu_read_lock(); 911 rcu_read_lock();
913 wq = rcu_dereference(sk->sk_wq); 912 wq = rcu_dereference(sk->sk_wq);
914 if (skwq_has_sleeper(wq)) 913 if (skwq_has_sleeper(wq))
915 wake_up_interruptible_sync_pol 914 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
916 915 EPOLLRDNORM |
917 916 EPOLLRDBAND);
918 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, !! 917 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
919 rcu_read_unlock(); 918 rcu_read_unlock();
920 } 919 }
921 920
922 /** 921 /**
923 * af_alg_sendmsg - implementation of sendmsg 922 * af_alg_sendmsg - implementation of sendmsg system call handler
924 * 923 *
925 * The sendmsg system call handler obtains the 924 * The sendmsg system call handler obtains the user data and stores it
926 * in ctx->tsgl_list. This implies allocation 925 * in ctx->tsgl_list. This implies allocation of the required numbers of
927 * struct af_alg_tsgl. 926 * struct af_alg_tsgl.
928 * 927 *
929 * In addition, the ctx is filled with the inf 928 * In addition, the ctx is filled with the information sent via CMSG.
930 * 929 *
931 * @sock: socket of connection to user space 930 * @sock: socket of connection to user space
932 * @msg: message from user space 931 * @msg: message from user space
933 * @size: size of message from user space 932 * @size: size of message from user space
934 * @ivsize: the size of the IV for the cipher 933 * @ivsize: the size of the IV for the cipher operation to verify that the
935 * user-space-provided IV has the righ 934 * user-space-provided IV has the right size
936 * Return: the number of copied data upon succ 935 * Return: the number of copied data upon success, < 0 upon error
937 */ 936 */
938 int af_alg_sendmsg(struct socket *sock, struct 937 int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
939 unsigned int ivsize) 938 unsigned int ivsize)
940 { 939 {
941 struct sock *sk = sock->sk; 940 struct sock *sk = sock->sk;
942 struct alg_sock *ask = alg_sk(sk); 941 struct alg_sock *ask = alg_sk(sk);
943 struct af_alg_ctx *ctx = ask->private; 942 struct af_alg_ctx *ctx = ask->private;
944 struct af_alg_tsgl *sgl; 943 struct af_alg_tsgl *sgl;
945 struct af_alg_control con = {}; 944 struct af_alg_control con = {};
946 long copied = 0; 945 long copied = 0;
947 bool enc = false; 946 bool enc = false;
948 bool init = false; 947 bool init = false;
949 int err = 0; 948 int err = 0;
950 949
951 if (msg->msg_controllen) { 950 if (msg->msg_controllen) {
952 err = af_alg_cmsg_send(msg, &c 951 err = af_alg_cmsg_send(msg, &con);
953 if (err) 952 if (err)
954 return err; 953 return err;
955 954
956 init = true; 955 init = true;
957 switch (con.op) { 956 switch (con.op) {
958 case ALG_OP_ENCRYPT: 957 case ALG_OP_ENCRYPT:
959 enc = true; 958 enc = true;
960 break; 959 break;
961 case ALG_OP_DECRYPT: 960 case ALG_OP_DECRYPT:
962 enc = false; 961 enc = false;
963 break; 962 break;
964 default: 963 default:
965 return -EINVAL; 964 return -EINVAL;
966 } 965 }
967 966
968 if (con.iv && con.iv->ivlen != 967 if (con.iv && con.iv->ivlen != ivsize)
969 return -EINVAL; 968 return -EINVAL;
970 } 969 }
971 970
972 lock_sock(sk); 971 lock_sock(sk);
973 if (ctx->init && !ctx->more) { 972 if (ctx->init && !ctx->more) {
974 if (ctx->used) { 973 if (ctx->used) {
975 err = -EINVAL; 974 err = -EINVAL;
976 goto unlock; 975 goto unlock;
977 } 976 }
978 977
979 pr_info_once( 978 pr_info_once(
980 "%s sent an empty cont 979 "%s sent an empty control message without MSG_MORE.\n",
981 current->comm); 980 current->comm);
982 } 981 }
983 ctx->init = true; 982 ctx->init = true;
984 983
985 if (init) { 984 if (init) {
986 ctx->enc = enc; 985 ctx->enc = enc;
987 if (con.iv) 986 if (con.iv)
988 memcpy(ctx->iv, con.iv 987 memcpy(ctx->iv, con.iv->iv, ivsize);
989 988
990 ctx->aead_assoclen = con.aead_ 989 ctx->aead_assoclen = con.aead_assoclen;
991 } 990 }
992 991
993 while (size) { 992 while (size) {
994 struct scatterlist *sg; 993 struct scatterlist *sg;
995 size_t len = size; 994 size_t len = size;
996 ssize_t plen; 995 ssize_t plen;
997 996
998 /* use the existing memory in 997 /* use the existing memory in an allocated page */
999 if (ctx->merge && !(msg->msg_f 998 if (ctx->merge && !(msg->msg_flags & MSG_SPLICE_PAGES)) {
1000 sgl = list_entry(ctx- 999 sgl = list_entry(ctx->tsgl_list.prev,
1001 stru 1000 struct af_alg_tsgl, list);
1002 sg = sgl->sg + sgl->c 1001 sg = sgl->sg + sgl->cur - 1;
1003 len = min_t(size_t, l 1002 len = min_t(size_t, len,
1004 PAGE_SIZE 1003 PAGE_SIZE - sg->offset - sg->length);
1005 1004
1006 err = memcpy_from_msg 1005 err = memcpy_from_msg(page_address(sg_page(sg)) +
1007 1006 sg->offset + sg->length,
1008 1007 msg, len);
1009 if (err) 1008 if (err)
1010 goto unlock; 1009 goto unlock;
1011 1010
1012 sg->length += len; 1011 sg->length += len;
1013 ctx->merge = (sg->off 1012 ctx->merge = (sg->offset + sg->length) &
1014 (PAGE_SI 1013 (PAGE_SIZE - 1);
1015 1014
1016 ctx->used += len; 1015 ctx->used += len;
1017 copied += len; 1016 copied += len;
1018 size -= len; 1017 size -= len;
1019 continue; 1018 continue;
1020 } 1019 }
1021 1020
1022 if (!af_alg_writable(sk)) { 1021 if (!af_alg_writable(sk)) {
1023 err = af_alg_wait_for 1022 err = af_alg_wait_for_wmem(sk, msg->msg_flags);
1024 if (err) 1023 if (err)
1025 goto unlock; 1024 goto unlock;
1026 } 1025 }
1027 1026
1028 /* allocate a new page */ 1027 /* allocate a new page */
1029 len = min_t(unsigned long, le 1028 len = min_t(unsigned long, len, af_alg_sndbuf(sk));
1030 1029
1031 err = af_alg_alloc_tsgl(sk); 1030 err = af_alg_alloc_tsgl(sk);
1032 if (err) 1031 if (err)
1033 goto unlock; 1032 goto unlock;
1034 1033
1035 sgl = list_entry(ctx->tsgl_li 1034 sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl,
1036 list); 1035 list);
1037 sg = sgl->sg; 1036 sg = sgl->sg;
1038 if (sgl->cur) 1037 if (sgl->cur)
1039 sg_unmark_end(sg + sg 1038 sg_unmark_end(sg + sgl->cur - 1);
1040 1039
1041 if (msg->msg_flags & MSG_SPLI 1040 if (msg->msg_flags & MSG_SPLICE_PAGES) {
1042 struct sg_table sgtab 1041 struct sg_table sgtable = {
1043 .sgl 1042 .sgl = sg,
1044 .nents 1043 .nents = sgl->cur,
1045 .orig_nents 1044 .orig_nents = sgl->cur,
1046 }; 1045 };
1047 1046
1048 plen = extract_iter_t 1047 plen = extract_iter_to_sg(&msg->msg_iter, len, &sgtable,
1049 1048 MAX_SGL_ENTS - sgl->cur, 0);
1050 if (plen < 0) { 1049 if (plen < 0) {
1051 err = plen; 1050 err = plen;
1052 goto unlock; 1051 goto unlock;
1053 } 1052 }
1054 1053
1055 for (; sgl->cur < sgt 1054 for (; sgl->cur < sgtable.nents; sgl->cur++)
1056 get_page(sg_p 1055 get_page(sg_page(&sg[sgl->cur]));
1057 len -= plen; 1056 len -= plen;
1058 ctx->used += plen; 1057 ctx->used += plen;
1059 copied += plen; 1058 copied += plen;
1060 size -= plen; 1059 size -= plen;
1061 ctx->merge = 0; 1060 ctx->merge = 0;
1062 } else { 1061 } else {
1063 do { 1062 do {
1064 struct page * 1063 struct page *pg;
1065 unsigned int 1064 unsigned int i = sgl->cur;
1066 1065
1067 plen = min_t( 1066 plen = min_t(size_t, len, PAGE_SIZE);
1068 1067
1069 pg = alloc_pa 1068 pg = alloc_page(GFP_KERNEL);
1070 if (!pg) { 1069 if (!pg) {
1071 err = 1070 err = -ENOMEM;
1072 goto 1071 goto unlock;
1073 } 1072 }
1074 1073
1075 sg_assign_pag 1074 sg_assign_page(sg + i, pg);
1076 1075
1077 err = memcpy_ 1076 err = memcpy_from_msg(
1078 page_ 1077 page_address(sg_page(sg + i)),
1079 msg, 1078 msg, plen);
1080 if (err) { 1079 if (err) {
1081 __fre 1080 __free_page(sg_page(sg + i));
1082 sg_as 1081 sg_assign_page(sg + i, NULL);
1083 goto 1082 goto unlock;
1084 } 1083 }
1085 1084
1086 sg[i].length 1085 sg[i].length = plen;
1087 len -= plen; 1086 len -= plen;
1088 ctx->used += 1087 ctx->used += plen;
1089 copied += ple 1088 copied += plen;
1090 size -= plen; 1089 size -= plen;
1091 sgl->cur++; 1090 sgl->cur++;
1092 } while (len && sgl-> 1091 } while (len && sgl->cur < MAX_SGL_ENTS);
1093 1092
1094 ctx->merge = plen & ( 1093 ctx->merge = plen & (PAGE_SIZE - 1);
1095 } 1094 }
1096 1095
1097 if (!size) 1096 if (!size)
1098 sg_mark_end(sg + sgl- 1097 sg_mark_end(sg + sgl->cur - 1);
1099 } 1098 }
1100 1099
1101 err = 0; 1100 err = 0;
1102 1101
1103 ctx->more = msg->msg_flags & MSG_MORE 1102 ctx->more = msg->msg_flags & MSG_MORE;
1104 1103
1105 unlock: 1104 unlock:
1106 af_alg_data_wakeup(sk); 1105 af_alg_data_wakeup(sk);
1107 release_sock(sk); 1106 release_sock(sk);
1108 1107
1109 return copied ?: err; 1108 return copied ?: err;
1110 } 1109 }
1111 EXPORT_SYMBOL_GPL(af_alg_sendmsg); 1110 EXPORT_SYMBOL_GPL(af_alg_sendmsg);
1112 1111
1113 /** 1112 /**
1114 * af_alg_free_resources - release resources 1113 * af_alg_free_resources - release resources required for crypto request
1115 * @areq: Request holding the TX and RX SGL 1114 * @areq: Request holding the TX and RX SGL
1116 */ 1115 */
1117 void af_alg_free_resources(struct af_alg_asyn 1116 void af_alg_free_resources(struct af_alg_async_req *areq)
1118 { 1117 {
1119 struct sock *sk = areq->sk; 1118 struct sock *sk = areq->sk;
1120 struct af_alg_ctx *ctx; 1119 struct af_alg_ctx *ctx;
1121 1120
1122 af_alg_free_areq_sgls(areq); 1121 af_alg_free_areq_sgls(areq);
1123 sock_kfree_s(sk, areq, areq->areqlen) 1122 sock_kfree_s(sk, areq, areq->areqlen);
1124 1123
1125 ctx = alg_sk(sk)->private; 1124 ctx = alg_sk(sk)->private;
1126 ctx->inflight = false; 1125 ctx->inflight = false;
1127 } 1126 }
1128 EXPORT_SYMBOL_GPL(af_alg_free_resources); 1127 EXPORT_SYMBOL_GPL(af_alg_free_resources);
1129 1128
1130 /** 1129 /**
1131 * af_alg_async_cb - AIO callback handler 1130 * af_alg_async_cb - AIO callback handler
1132 * @data: async request completion data 1131 * @data: async request completion data
1133 * @err: if non-zero, error result to be retu 1132 * @err: if non-zero, error result to be returned via ki_complete();
1134 * otherwise return the AIO output leng 1133 * otherwise return the AIO output length via ki_complete().
1135 * 1134 *
1136 * This handler cleans up the struct af_alg_a 1135 * This handler cleans up the struct af_alg_async_req upon completion of the
1137 * AIO operation. 1136 * AIO operation.
1138 * 1137 *
1139 * The number of bytes to be generated with t 1138 * The number of bytes to be generated with the AIO operation must be set
1140 * in areq->outlen before the AIO callback ha 1139 * in areq->outlen before the AIO callback handler is invoked.
1141 */ 1140 */
1142 void af_alg_async_cb(void *data, int err) 1141 void af_alg_async_cb(void *data, int err)
1143 { 1142 {
1144 struct af_alg_async_req *areq = data; 1143 struct af_alg_async_req *areq = data;
1145 struct sock *sk = areq->sk; 1144 struct sock *sk = areq->sk;
1146 struct kiocb *iocb = areq->iocb; 1145 struct kiocb *iocb = areq->iocb;
1147 unsigned int resultlen; 1146 unsigned int resultlen;
1148 1147
1149 /* Buffer size written by crypto oper 1148 /* Buffer size written by crypto operation. */
1150 resultlen = areq->outlen; 1149 resultlen = areq->outlen;
1151 1150
1152 af_alg_free_resources(areq); 1151 af_alg_free_resources(areq);
1153 sock_put(sk); 1152 sock_put(sk);
1154 1153
1155 iocb->ki_complete(iocb, err ? err : ( 1154 iocb->ki_complete(iocb, err ? err : (int)resultlen);
1156 } 1155 }
1157 EXPORT_SYMBOL_GPL(af_alg_async_cb); 1156 EXPORT_SYMBOL_GPL(af_alg_async_cb);
1158 1157
1159 /** 1158 /**
1160 * af_alg_poll - poll system call handler 1159 * af_alg_poll - poll system call handler
1161 * @file: file pointer 1160 * @file: file pointer
1162 * @sock: socket to poll 1161 * @sock: socket to poll
1163 * @wait: poll_table 1162 * @wait: poll_table
1164 */ 1163 */
1165 __poll_t af_alg_poll(struct file *file, struc 1164 __poll_t af_alg_poll(struct file *file, struct socket *sock,
1166 poll_table *wait) 1165 poll_table *wait)
1167 { 1166 {
1168 struct sock *sk = sock->sk; 1167 struct sock *sk = sock->sk;
1169 struct alg_sock *ask = alg_sk(sk); 1168 struct alg_sock *ask = alg_sk(sk);
1170 struct af_alg_ctx *ctx = ask->private 1169 struct af_alg_ctx *ctx = ask->private;
1171 __poll_t mask; 1170 __poll_t mask;
1172 1171
1173 sock_poll_wait(file, sock, wait); 1172 sock_poll_wait(file, sock, wait);
1174 mask = 0; 1173 mask = 0;
1175 1174
1176 if (!ctx->more || ctx->used) 1175 if (!ctx->more || ctx->used)
1177 mask |= EPOLLIN | EPOLLRDNORM 1176 mask |= EPOLLIN | EPOLLRDNORM;
1178 1177
1179 if (af_alg_writable(sk)) 1178 if (af_alg_writable(sk))
1180 mask |= EPOLLOUT | EPOLLWRNOR 1179 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1181 1180
1182 return mask; 1181 return mask;
1183 } 1182 }
1184 EXPORT_SYMBOL_GPL(af_alg_poll); 1183 EXPORT_SYMBOL_GPL(af_alg_poll);
1185 1184
1186 /** 1185 /**
1187 * af_alg_alloc_areq - allocate struct af_alg 1186 * af_alg_alloc_areq - allocate struct af_alg_async_req
1188 * 1187 *
1189 * @sk: socket of connection to user space 1188 * @sk: socket of connection to user space
1190 * @areqlen: size of struct af_alg_async_req 1189 * @areqlen: size of struct af_alg_async_req + crypto_*_reqsize
1191 * Return: allocated data structure or ERR_PT 1190 * Return: allocated data structure or ERR_PTR upon error
1192 */ 1191 */
1193 struct af_alg_async_req *af_alg_alloc_areq(st 1192 struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk,
1194 un 1193 unsigned int areqlen)
1195 { 1194 {
1196 struct af_alg_ctx *ctx = alg_sk(sk)-> 1195 struct af_alg_ctx *ctx = alg_sk(sk)->private;
1197 struct af_alg_async_req *areq; 1196 struct af_alg_async_req *areq;
1198 1197
1199 /* Only one AIO request can be in fli 1198 /* Only one AIO request can be in flight. */
1200 if (ctx->inflight) 1199 if (ctx->inflight)
1201 return ERR_PTR(-EBUSY); 1200 return ERR_PTR(-EBUSY);
1202 1201
1203 areq = sock_kmalloc(sk, areqlen, GFP_ 1202 areq = sock_kmalloc(sk, areqlen, GFP_KERNEL);
1204 if (unlikely(!areq)) 1203 if (unlikely(!areq))
1205 return ERR_PTR(-ENOMEM); 1204 return ERR_PTR(-ENOMEM);
1206 1205
1207 ctx->inflight = true; 1206 ctx->inflight = true;
1208 1207
1209 areq->areqlen = areqlen; 1208 areq->areqlen = areqlen;
1210 areq->sk = sk; 1209 areq->sk = sk;
1211 areq->first_rsgl.sgl.sgt.sgl = areq-> 1210 areq->first_rsgl.sgl.sgt.sgl = areq->first_rsgl.sgl.sgl;
1212 areq->last_rsgl = NULL; 1211 areq->last_rsgl = NULL;
1213 INIT_LIST_HEAD(&areq->rsgl_list); 1212 INIT_LIST_HEAD(&areq->rsgl_list);
1214 areq->tsgl = NULL; 1213 areq->tsgl = NULL;
1215 areq->tsgl_entries = 0; 1214 areq->tsgl_entries = 0;
1216 1215
1217 return areq; 1216 return areq;
1218 } 1217 }
1219 EXPORT_SYMBOL_GPL(af_alg_alloc_areq); 1218 EXPORT_SYMBOL_GPL(af_alg_alloc_areq);
1220 1219
1221 /** 1220 /**
1222 * af_alg_get_rsgl - create the RX SGL for th 1221 * af_alg_get_rsgl - create the RX SGL for the output data from the crypto
1223 * operation 1222 * operation
1224 * 1223 *
1225 * @sk: socket of connection to user space 1224 * @sk: socket of connection to user space
1226 * @msg: user space message 1225 * @msg: user space message
1227 * @flags: flags used to invoke recvmsg with 1226 * @flags: flags used to invoke recvmsg with
1228 * @areq: instance of the cryptographic reque 1227 * @areq: instance of the cryptographic request that will hold the RX SGL
1229 * @maxsize: maximum number of bytes to be pu 1228 * @maxsize: maximum number of bytes to be pulled from user space
1230 * @outlen: number of bytes in the RX SGL 1229 * @outlen: number of bytes in the RX SGL
1231 * Return: 0 on success, < 0 upon error 1230 * Return: 0 on success, < 0 upon error
1232 */ 1231 */
1233 int af_alg_get_rsgl(struct sock *sk, struct m 1232 int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
1234 struct af_alg_async_req * 1233 struct af_alg_async_req *areq, size_t maxsize,
1235 size_t *outlen) 1234 size_t *outlen)
1236 { 1235 {
1237 struct alg_sock *ask = alg_sk(sk); 1236 struct alg_sock *ask = alg_sk(sk);
1238 struct af_alg_ctx *ctx = ask->private 1237 struct af_alg_ctx *ctx = ask->private;
1239 size_t len = 0; 1238 size_t len = 0;
1240 1239
1241 while (maxsize > len && msg_data_left 1240 while (maxsize > len && msg_data_left(msg)) {
1242 struct af_alg_rsgl *rsgl; 1241 struct af_alg_rsgl *rsgl;
1243 ssize_t err; 1242 ssize_t err;
1244 size_t seglen; 1243 size_t seglen;
1245 1244
1246 /* limit the amount of readab 1245 /* limit the amount of readable buffers */
1247 if (!af_alg_readable(sk)) 1246 if (!af_alg_readable(sk))
1248 break; 1247 break;
1249 1248
1250 seglen = min_t(size_t, (maxsi 1249 seglen = min_t(size_t, (maxsize - len),
1251 msg_data_left( 1250 msg_data_left(msg));
1252 1251
1253 if (list_empty(&areq->rsgl_li 1252 if (list_empty(&areq->rsgl_list)) {
1254 rsgl = &areq->first_r 1253 rsgl = &areq->first_rsgl;
1255 } else { 1254 } else {
1256 rsgl = sock_kmalloc(s 1255 rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL);
1257 if (unlikely(!rsgl)) 1256 if (unlikely(!rsgl))
1258 return -ENOME 1257 return -ENOMEM;
1259 } 1258 }
1260 1259
1261 rsgl->sgl.need_unpin = 1260 rsgl->sgl.need_unpin =
1262 iov_iter_extract_will 1261 iov_iter_extract_will_pin(&msg->msg_iter);
1263 rsgl->sgl.sgt.sgl = rsgl->sgl 1262 rsgl->sgl.sgt.sgl = rsgl->sgl.sgl;
1264 rsgl->sgl.sgt.nents = 0; 1263 rsgl->sgl.sgt.nents = 0;
1265 rsgl->sgl.sgt.orig_nents = 0; 1264 rsgl->sgl.sgt.orig_nents = 0;
1266 list_add_tail(&rsgl->list, &a 1265 list_add_tail(&rsgl->list, &areq->rsgl_list);
1267 1266
1268 sg_init_table(rsgl->sgl.sgt.s 1267 sg_init_table(rsgl->sgl.sgt.sgl, ALG_MAX_PAGES);
1269 err = extract_iter_to_sg(&msg 1268 err = extract_iter_to_sg(&msg->msg_iter, seglen, &rsgl->sgl.sgt,
1270 ALG_ 1269 ALG_MAX_PAGES, 0);
1271 if (err < 0) { 1270 if (err < 0) {
1272 rsgl->sg_num_bytes = 1271 rsgl->sg_num_bytes = 0;
1273 return err; 1272 return err;
1274 } 1273 }
1275 1274
1276 sg_mark_end(rsgl->sgl.sgt.sgl 1275 sg_mark_end(rsgl->sgl.sgt.sgl + rsgl->sgl.sgt.nents - 1);
1277 1276
1278 /* chain the new scatterlist 1277 /* chain the new scatterlist with previous one */
1279 if (areq->last_rsgl) 1278 if (areq->last_rsgl)
1280 af_alg_link_sg(&areq- 1279 af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl);
1281 1280
1282 areq->last_rsgl = rsgl; 1281 areq->last_rsgl = rsgl;
1283 len += err; 1282 len += err;
1284 atomic_add(err, &ctx->rcvused 1283 atomic_add(err, &ctx->rcvused);
1285 rsgl->sg_num_bytes = err; 1284 rsgl->sg_num_bytes = err;
1286 } 1285 }
1287 1286
1288 *outlen = len; 1287 *outlen = len;
1289 return 0; 1288 return 0;
1290 } 1289 }
1291 EXPORT_SYMBOL_GPL(af_alg_get_rsgl); 1290 EXPORT_SYMBOL_GPL(af_alg_get_rsgl);
1292 1291
1293 static int __init af_alg_init(void) 1292 static int __init af_alg_init(void)
1294 { 1293 {
1295 int err = proto_register(&alg_proto, 1294 int err = proto_register(&alg_proto, 0);
1296 1295
1297 if (err) 1296 if (err)
1298 goto out; 1297 goto out;
1299 1298
1300 err = sock_register(&alg_family); 1299 err = sock_register(&alg_family);
1301 if (err != 0) 1300 if (err != 0)
1302 goto out_unregister_proto; 1301 goto out_unregister_proto;
1303 1302
1304 out: 1303 out:
1305 return err; 1304 return err;
1306 1305
1307 out_unregister_proto: 1306 out_unregister_proto:
1308 proto_unregister(&alg_proto); 1307 proto_unregister(&alg_proto);
1309 goto out; 1308 goto out;
1310 } 1309 }
1311 1310
1312 static void __exit af_alg_exit(void) 1311 static void __exit af_alg_exit(void)
1313 { 1312 {
1314 sock_unregister(PF_ALG); 1313 sock_unregister(PF_ALG);
1315 proto_unregister(&alg_proto); 1314 proto_unregister(&alg_proto);
1316 } 1315 }
1317 1316
1318 module_init(af_alg_init); 1317 module_init(af_alg_init);
1319 module_exit(af_alg_exit); 1318 module_exit(af_alg_exit);
1320 MODULE_DESCRIPTION("Crypto userspace interfac <<
1321 MODULE_LICENSE("GPL"); 1319 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_NETPROTO(AF_ALG); 1320 MODULE_ALIAS_NETPROTO(AF_ALG);
1323 1321
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