Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 1 | /* |
| 2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/connector.h> |
| 18 | #include <linux/crypto.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/mutex.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/in.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 24 | |
| 25 | #include "netfs.h" |
| 26 | |
| 27 | /* |
| 28 | * Global configuration list. |
| 29 | * Each client can be asked to get one of them. |
| 30 | * |
| 31 | * Allows to provide remote server address (ipv4/v6/whatever), port |
| 32 | * and so on via kernel connector. |
| 33 | */ |
| 34 | |
| 35 | static struct cb_id pohmelfs_cn_id = {.idx = POHMELFS_CN_IDX, .val = POHMELFS_CN_VAL}; |
| 36 | static LIST_HEAD(pohmelfs_config_list); |
| 37 | static DEFINE_MUTEX(pohmelfs_config_lock); |
| 38 | |
| 39 | static inline int pohmelfs_config_eql(struct pohmelfs_ctl *sc, struct pohmelfs_ctl *ctl) |
| 40 | { |
| 41 | if (sc->idx == ctl->idx && sc->type == ctl->type && |
| 42 | sc->proto == ctl->proto && |
| 43 | sc->addrlen == ctl->addrlen && |
| 44 | !memcmp(&sc->addr, &ctl->addr, ctl->addrlen)) |
| 45 | return 1; |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static struct pohmelfs_config_group *pohmelfs_find_config_group(unsigned int idx) |
| 51 | { |
| 52 | struct pohmelfs_config_group *g, *group = NULL; |
| 53 | |
| 54 | list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
| 55 | if (g->idx == idx) { |
| 56 | group = g; |
| 57 | break; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | return group; |
| 62 | } |
| 63 | |
| 64 | static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned int idx) |
| 65 | { |
| 66 | struct pohmelfs_config_group *g; |
| 67 | |
| 68 | g = pohmelfs_find_config_group(idx); |
| 69 | if (g) |
| 70 | return g; |
| 71 | |
| 72 | g = kzalloc(sizeof(struct pohmelfs_config_group), GFP_KERNEL); |
| 73 | if (!g) |
| 74 | return NULL; |
| 75 | |
| 76 | INIT_LIST_HEAD(&g->config_list); |
| 77 | g->idx = idx; |
| 78 | g->num_entry = 0; |
| 79 | |
| 80 | list_add_tail(&g->group_entry, &pohmelfs_config_list); |
| 81 | |
| 82 | return g; |
| 83 | } |
| 84 | |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 85 | static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst) |
| 86 | { |
| 87 | struct pohmelfs_config *tmp; |
| 88 | |
| 89 | INIT_LIST_HEAD(&dst->config_entry); |
| 90 | |
| 91 | list_for_each_entry(tmp, &psb->state_list, config_entry) { |
| 92 | if (dst->state.ctl.prio > tmp->state.ctl.prio) |
| 93 | list_add_tail(&dst->config_entry, &tmp->config_entry); |
| 94 | } |
| 95 | if (list_empty(&dst->config_entry)) |
| 96 | list_add_tail(&dst->config_entry, &psb->state_list); |
| 97 | } |
| 98 | |
| 99 | static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb, |
| 100 | struct pohmelfs_config *dst, struct pohmelfs_config *new) |
| 101 | { |
| 102 | if ((dst->state.ctl.prio == new->state.ctl.prio) && |
| 103 | (dst->state.ctl.perm == new->state.ctl.perm)) |
| 104 | return 0; |
| 105 | |
| 106 | dprintk("%s: dst: prio: %d, perm: %x, new: prio: %d, perm: %d.\n", |
| 107 | __func__, dst->state.ctl.prio, dst->state.ctl.perm, |
| 108 | new->state.ctl.prio, new->state.ctl.perm); |
| 109 | dst->state.ctl.prio = new->state.ctl.prio; |
| 110 | dst->state.ctl.perm = new->state.ctl.perm; |
| 111 | |
| 112 | list_del_init(&dst->config_entry); |
| 113 | pohmelfs_insert_config_entry(psb, dst); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * pohmelfs_copy_config() is used to copy new state configs from the |
| 119 | * config group (controlled by the netlink messages) into the superblock. |
| 120 | * This happens either at startup time where no transactions can access |
| 121 | * the list of the configs (and thus list of the network states), or at |
| 122 | * run-time, where it is protected by the psb->state_lock. |
| 123 | */ |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 124 | int pohmelfs_copy_config(struct pohmelfs_sb *psb) |
| 125 | { |
| 126 | struct pohmelfs_config_group *g; |
| 127 | struct pohmelfs_config *c, *dst; |
| 128 | int err = -ENODEV; |
| 129 | |
| 130 | mutex_lock(&pohmelfs_config_lock); |
| 131 | |
| 132 | g = pohmelfs_find_config_group(psb->idx); |
| 133 | if (!g) |
| 134 | goto out_unlock; |
| 135 | |
| 136 | /* |
Justin P. Mattock | c69ab1a | 2011-01-31 22:48:25 -0800 | [diff] [blame] | 137 | * Run over all entries in given config group and try to create and |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 138 | * initialize those, which do not exist in superblock list. |
| 139 | * Skip all existing entries. |
| 140 | */ |
| 141 | |
| 142 | list_for_each_entry(c, &g->config_list, config_entry) { |
| 143 | err = 0; |
| 144 | list_for_each_entry(dst, &psb->state_list, config_entry) { |
| 145 | if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) { |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 146 | err = pohmelfs_move_config_entry(psb, dst, c); |
| 147 | if (!err) |
| 148 | err = -EEXIST; |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 149 | break; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | if (err) |
| 154 | continue; |
| 155 | |
| 156 | dst = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL); |
| 157 | if (!dst) { |
| 158 | err = -ENOMEM; |
| 159 | break; |
| 160 | } |
| 161 | |
| 162 | memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl)); |
| 163 | |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 164 | pohmelfs_insert_config_entry(psb, dst); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 165 | |
| 166 | err = pohmelfs_state_init_one(psb, dst); |
| 167 | if (err) { |
| 168 | list_del(&dst->config_entry); |
| 169 | kfree(dst); |
| 170 | } |
| 171 | |
| 172 | err = 0; |
| 173 | } |
| 174 | |
| 175 | out_unlock: |
| 176 | mutex_unlock(&pohmelfs_config_lock); |
| 177 | |
| 178 | return err; |
| 179 | } |
| 180 | |
| 181 | int pohmelfs_copy_crypto(struct pohmelfs_sb *psb) |
| 182 | { |
| 183 | struct pohmelfs_config_group *g; |
| 184 | int err = -ENOENT; |
| 185 | |
| 186 | mutex_lock(&pohmelfs_config_lock); |
| 187 | g = pohmelfs_find_config_group(psb->idx); |
| 188 | if (!g) |
| 189 | goto err_out_exit; |
| 190 | |
| 191 | if (g->hash_string) { |
| 192 | err = -ENOMEM; |
| 193 | psb->hash_string = kstrdup(g->hash_string, GFP_KERNEL); |
| 194 | if (!psb->hash_string) |
| 195 | goto err_out_exit; |
| 196 | psb->hash_strlen = g->hash_strlen; |
| 197 | } |
| 198 | |
| 199 | if (g->cipher_string) { |
| 200 | psb->cipher_string = kstrdup(g->cipher_string, GFP_KERNEL); |
| 201 | if (!psb->cipher_string) |
| 202 | goto err_out_free_hash_string; |
| 203 | psb->cipher_strlen = g->cipher_strlen; |
| 204 | } |
| 205 | |
| 206 | if (g->hash_keysize) { |
Julia Lawall | 94002c0 | 2010-05-15 23:21:43 +0200 | [diff] [blame] | 207 | psb->hash_key = kmemdup(g->hash_key, g->hash_keysize, |
| 208 | GFP_KERNEL); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 209 | if (!psb->hash_key) |
| 210 | goto err_out_free_cipher_string; |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 211 | psb->hash_keysize = g->hash_keysize; |
| 212 | } |
| 213 | |
| 214 | if (g->cipher_keysize) { |
Julia Lawall | 94002c0 | 2010-05-15 23:21:43 +0200 | [diff] [blame] | 215 | psb->cipher_key = kmemdup(g->cipher_key, g->cipher_keysize, |
| 216 | GFP_KERNEL); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 217 | if (!psb->cipher_key) |
| 218 | goto err_out_free_hash; |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 219 | psb->cipher_keysize = g->cipher_keysize; |
| 220 | } |
| 221 | |
| 222 | mutex_unlock(&pohmelfs_config_lock); |
| 223 | |
| 224 | return 0; |
| 225 | |
| 226 | err_out_free_hash: |
| 227 | kfree(psb->hash_key); |
| 228 | err_out_free_cipher_string: |
| 229 | kfree(psb->cipher_string); |
| 230 | err_out_free_hash_string: |
| 231 | kfree(psb->hash_string); |
| 232 | err_out_exit: |
| 233 | mutex_unlock(&pohmelfs_config_lock); |
| 234 | return err; |
| 235 | } |
| 236 | |
| 237 | static int pohmelfs_send_reply(int err, int msg_num, int action, struct cn_msg *msg, struct pohmelfs_ctl *ctl) |
| 238 | { |
| 239 | struct pohmelfs_cn_ack *ack; |
| 240 | |
Julia Lawall | 7a6cb0d | 2010-05-13 22:00:05 +0200 | [diff] [blame] | 241 | ack = kzalloc(sizeof(struct pohmelfs_cn_ack), GFP_KERNEL); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 242 | if (!ack) |
| 243 | return -ENOMEM; |
| 244 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 245 | memcpy(&ack->msg, msg, sizeof(struct cn_msg)); |
| 246 | |
| 247 | if (action == POHMELFS_CTLINFO_ACK) |
| 248 | memcpy(&ack->ctl, ctl, sizeof(struct pohmelfs_ctl)); |
| 249 | |
| 250 | ack->msg.len = sizeof(struct pohmelfs_cn_ack) - sizeof(struct cn_msg); |
| 251 | ack->msg.ack = msg->ack + 1; |
| 252 | ack->error = err; |
| 253 | ack->msg_num = msg_num; |
| 254 | |
| 255 | cn_netlink_send(&ack->msg, 0, GFP_KERNEL); |
| 256 | kfree(ack); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static int pohmelfs_cn_disp(struct cn_msg *msg) |
| 261 | { |
| 262 | struct pohmelfs_config_group *g; |
| 263 | struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| 264 | struct pohmelfs_config *c, *tmp; |
| 265 | int err = 0, i = 1; |
| 266 | |
| 267 | if (msg->len != sizeof(struct pohmelfs_ctl)) |
| 268 | return -EBADMSG; |
| 269 | |
| 270 | mutex_lock(&pohmelfs_config_lock); |
| 271 | |
| 272 | g = pohmelfs_find_config_group(ctl->idx); |
| 273 | if (!g) { |
| 274 | pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL); |
| 275 | goto out_unlock; |
| 276 | } |
| 277 | |
| 278 | list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| 279 | struct pohmelfs_ctl *sc = &c->state.ctl; |
| 280 | if (pohmelfs_send_reply(err, g->num_entry - i, POHMELFS_CTLINFO_ACK, msg, sc)) { |
| 281 | err = -ENOMEM; |
| 282 | goto out_unlock; |
| 283 | } |
| 284 | i += 1; |
| 285 | } |
| 286 | |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 287 | out_unlock: |
| 288 | mutex_unlock(&pohmelfs_config_lock); |
| 289 | return err; |
| 290 | } |
| 291 | |
| 292 | static int pohmelfs_cn_dump(struct cn_msg *msg) |
| 293 | { |
| 294 | struct pohmelfs_config_group *g; |
| 295 | struct pohmelfs_config *c, *tmp; |
| 296 | int err = 0, i = 1; |
| 297 | int total_msg = 0; |
| 298 | |
| 299 | if (msg->len != sizeof(struct pohmelfs_ctl)) |
| 300 | return -EBADMSG; |
| 301 | |
| 302 | mutex_lock(&pohmelfs_config_lock); |
| 303 | |
Julia Lawall | a3d7fc5 | 2010-08-03 23:34:36 +0200 | [diff] [blame] | 304 | list_for_each_entry(g, &pohmelfs_config_list, group_entry) |
| 305 | total_msg += g->num_entry; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 306 | if (total_msg == 0) { |
| 307 | if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| 308 | err = -ENOMEM; |
| 309 | goto out_unlock; |
| 310 | } |
| 311 | |
| 312 | list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
Julia Lawall | a3d7fc5 | 2010-08-03 23:34:36 +0200 | [diff] [blame] | 313 | list_for_each_entry_safe(c, tmp, &g->config_list, |
| 314 | config_entry) { |
| 315 | struct pohmelfs_ctl *sc = &c->state.ctl; |
| 316 | if (pohmelfs_send_reply(err, total_msg - i, |
| 317 | POHMELFS_CTLINFO_ACK, msg, |
| 318 | sc)) { |
| 319 | err = -ENOMEM; |
| 320 | goto out_unlock; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 321 | } |
Julia Lawall | a3d7fc5 | 2010-08-03 23:34:36 +0200 | [diff] [blame] | 322 | i += 1; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 323 | } |
| 324 | } |
| 325 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 326 | out_unlock: |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 327 | mutex_unlock(&pohmelfs_config_lock); |
| 328 | return err; |
| 329 | } |
| 330 | |
| 331 | static int pohmelfs_cn_flush(struct cn_msg *msg) |
| 332 | { |
| 333 | struct pohmelfs_config_group *g; |
| 334 | struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| 335 | struct pohmelfs_config *c, *tmp; |
| 336 | int err = 0; |
| 337 | |
| 338 | if (msg->len != sizeof(struct pohmelfs_ctl)) |
| 339 | return -EBADMSG; |
| 340 | |
| 341 | mutex_lock(&pohmelfs_config_lock); |
| 342 | |
| 343 | if (ctl->idx != POHMELFS_NULL_IDX) { |
| 344 | g = pohmelfs_find_config_group(ctl->idx); |
| 345 | |
| 346 | if (!g) |
| 347 | goto out_unlock; |
| 348 | |
| 349 | list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| 350 | list_del(&c->config_entry); |
| 351 | g->num_entry--; |
| 352 | kfree(c); |
| 353 | } |
| 354 | } else { |
| 355 | list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
Julia Lawall | a3d7fc5 | 2010-08-03 23:34:36 +0200 | [diff] [blame] | 356 | list_for_each_entry_safe(c, tmp, &g->config_list, |
| 357 | config_entry) { |
| 358 | list_del(&c->config_entry); |
| 359 | g->num_entry--; |
| 360 | kfree(c); |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 361 | } |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | out_unlock: |
| 366 | mutex_unlock(&pohmelfs_config_lock); |
| 367 | pohmelfs_cn_dump(msg); |
| 368 | |
| 369 | return err; |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 370 | } |
| 371 | |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 372 | static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new) |
| 373 | { |
| 374 | old->perm = new->perm; |
| 375 | old->prio = new->prio; |
| 376 | return 0; |
| 377 | } |
| 378 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 379 | static int pohmelfs_cn_ctl(struct cn_msg *msg, int action) |
| 380 | { |
| 381 | struct pohmelfs_config_group *g; |
| 382 | struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| 383 | struct pohmelfs_config *c, *tmp; |
| 384 | int err = 0; |
| 385 | |
| 386 | if (msg->len != sizeof(struct pohmelfs_ctl)) |
| 387 | return -EBADMSG; |
| 388 | |
| 389 | mutex_lock(&pohmelfs_config_lock); |
| 390 | |
| 391 | g = pohmelfs_find_create_config_group(ctl->idx); |
| 392 | if (!g) { |
| 393 | err = -ENOMEM; |
| 394 | goto out_unlock; |
| 395 | } |
| 396 | |
| 397 | list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| 398 | struct pohmelfs_ctl *sc = &c->state.ctl; |
| 399 | |
| 400 | if (pohmelfs_config_eql(sc, ctl)) { |
| 401 | if (action == POHMELFS_FLAGS_ADD) { |
| 402 | err = -EEXIST; |
| 403 | goto out_unlock; |
| 404 | } else if (action == POHMELFS_FLAGS_DEL) { |
| 405 | list_del(&c->config_entry); |
| 406 | g->num_entry--; |
| 407 | kfree(c); |
| 408 | goto out_unlock; |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 409 | } else if (action == POHMELFS_FLAGS_MODIFY) { |
| 410 | err = pohmelfs_modify_config(sc, ctl); |
| 411 | goto out_unlock; |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 412 | } else { |
| 413 | err = -EEXIST; |
| 414 | goto out_unlock; |
| 415 | } |
| 416 | } |
| 417 | } |
| 418 | if (action == POHMELFS_FLAGS_DEL) { |
| 419 | err = -EBADMSG; |
| 420 | goto out_unlock; |
| 421 | } |
| 422 | |
| 423 | c = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL); |
| 424 | if (!c) { |
| 425 | err = -ENOMEM; |
| 426 | goto out_unlock; |
| 427 | } |
| 428 | memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl)); |
| 429 | g->num_entry++; |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 430 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 431 | list_add_tail(&c->config_entry, &g->config_list); |
| 432 | |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 433 | out_unlock: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 434 | mutex_unlock(&pohmelfs_config_lock); |
| 435 | if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| 436 | err = -ENOMEM; |
| 437 | |
| 438 | return err; |
| 439 | } |
| 440 | |
| 441 | static int pohmelfs_crypto_hash_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c) |
| 442 | { |
| 443 | char *algo = (char *)c->data; |
| 444 | u8 *key = (u8 *)(algo + c->strlen); |
| 445 | |
| 446 | if (g->hash_string) |
| 447 | return -EEXIST; |
| 448 | |
| 449 | g->hash_string = kstrdup(algo, GFP_KERNEL); |
| 450 | if (!g->hash_string) |
| 451 | return -ENOMEM; |
| 452 | g->hash_strlen = c->strlen; |
| 453 | g->hash_keysize = c->keysize; |
| 454 | |
Julia Lawall | 94002c0 | 2010-05-15 23:21:43 +0200 | [diff] [blame] | 455 | g->hash_key = kmemdup(key, c->keysize, GFP_KERNEL); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 456 | if (!g->hash_key) { |
| 457 | kfree(g->hash_string); |
| 458 | return -ENOMEM; |
| 459 | } |
| 460 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | static int pohmelfs_crypto_cipher_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c) |
| 465 | { |
| 466 | char *algo = (char *)c->data; |
| 467 | u8 *key = (u8 *)(algo + c->strlen); |
| 468 | |
| 469 | if (g->cipher_string) |
| 470 | return -EEXIST; |
| 471 | |
| 472 | g->cipher_string = kstrdup(algo, GFP_KERNEL); |
| 473 | if (!g->cipher_string) |
| 474 | return -ENOMEM; |
| 475 | g->cipher_strlen = c->strlen; |
| 476 | g->cipher_keysize = c->keysize; |
| 477 | |
Julia Lawall | 94002c0 | 2010-05-15 23:21:43 +0200 | [diff] [blame] | 478 | g->cipher_key = kmemdup(key, c->keysize, GFP_KERNEL); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 479 | if (!g->cipher_key) { |
| 480 | kfree(g->cipher_string); |
| 481 | return -ENOMEM; |
| 482 | } |
| 483 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 484 | return 0; |
| 485 | } |
| 486 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 487 | static int pohmelfs_cn_crypto(struct cn_msg *msg) |
| 488 | { |
| 489 | struct pohmelfs_crypto *crypto = (struct pohmelfs_crypto *)msg->data; |
| 490 | struct pohmelfs_config_group *g; |
| 491 | int err = 0; |
| 492 | |
| 493 | dprintk("%s: idx: %u, strlen: %u, type: %u, keysize: %u, algo: %s.\n", |
| 494 | __func__, crypto->idx, crypto->strlen, crypto->type, |
| 495 | crypto->keysize, (char *)crypto->data); |
| 496 | |
| 497 | mutex_lock(&pohmelfs_config_lock); |
| 498 | g = pohmelfs_find_create_config_group(crypto->idx); |
| 499 | if (!g) { |
| 500 | err = -ENOMEM; |
| 501 | goto out_unlock; |
| 502 | } |
| 503 | |
| 504 | switch (crypto->type) { |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 505 | case POHMELFS_CRYPTO_HASH: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 506 | err = pohmelfs_crypto_hash_init(g, crypto); |
| 507 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 508 | case POHMELFS_CRYPTO_CIPHER: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 509 | err = pohmelfs_crypto_cipher_init(g, crypto); |
| 510 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 511 | default: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 512 | err = -ENOTSUPP; |
| 513 | break; |
| 514 | } |
| 515 | |
| 516 | out_unlock: |
| 517 | mutex_unlock(&pohmelfs_config_lock); |
| 518 | if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| 519 | err = -ENOMEM; |
| 520 | |
| 521 | return err; |
| 522 | } |
| 523 | |
Philipp Reisner | 7069331 | 2009-10-02 02:40:05 +0000 | [diff] [blame] | 524 | static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 525 | { |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 526 | int err; |
| 527 | |
Patrick McHardy | 01a16b2 | 2011-03-03 13:32:07 -0800 | [diff] [blame] | 528 | if (!cap_raised(current_cap(), CAP_SYS_ADMIN)) |
Philipp Reisner | 98a5783 | 2009-10-02 02:40:10 +0000 | [diff] [blame] | 529 | return; |
| 530 | |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 531 | switch (msg->flags) { |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 532 | case POHMELFS_FLAGS_ADD: |
| 533 | case POHMELFS_FLAGS_DEL: |
| 534 | case POHMELFS_FLAGS_MODIFY: |
Evgeniy Polyakov | e0ca873 | 2009-03-27 15:04:29 +0300 | [diff] [blame] | 535 | err = pohmelfs_cn_ctl(msg, msg->flags); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 536 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 537 | case POHMELFS_FLAGS_FLUSH: |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 538 | err = pohmelfs_cn_flush(msg); |
| 539 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 540 | case POHMELFS_FLAGS_SHOW: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 541 | err = pohmelfs_cn_disp(msg); |
| 542 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 543 | case POHMELFS_FLAGS_DUMP: |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 544 | err = pohmelfs_cn_dump(msg); |
| 545 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 546 | case POHMELFS_FLAGS_CRYPTO: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 547 | err = pohmelfs_cn_crypto(msg); |
| 548 | break; |
Ruslan Pisarev | 5ac7af8 | 2010-03-14 17:11:03 +0200 | [diff] [blame] | 549 | default: |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 550 | err = -ENOSYS; |
| 551 | break; |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | int pohmelfs_config_check(struct pohmelfs_config *config, int idx) |
| 556 | { |
| 557 | struct pohmelfs_ctl *ctl = &config->state.ctl; |
| 558 | struct pohmelfs_config *tmp; |
| 559 | int err = -ENOENT; |
| 560 | struct pohmelfs_ctl *sc; |
| 561 | struct pohmelfs_config_group *g; |
| 562 | |
| 563 | mutex_lock(&pohmelfs_config_lock); |
| 564 | |
| 565 | g = pohmelfs_find_config_group(ctl->idx); |
| 566 | if (g) { |
| 567 | list_for_each_entry(tmp, &g->config_list, config_entry) { |
| 568 | sc = &tmp->state.ctl; |
| 569 | |
| 570 | if (pohmelfs_config_eql(sc, ctl)) { |
| 571 | err = 0; |
| 572 | break; |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | mutex_unlock(&pohmelfs_config_lock); |
| 578 | |
| 579 | return err; |
| 580 | } |
| 581 | |
| 582 | int __init pohmelfs_config_init(void) |
| 583 | { |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 584 | /* XXX remove (void *) cast when vanilla connector got synced */ |
| 585 | return cn_add_callback(&pohmelfs_cn_id, "pohmelfs", (void *)pohmelfs_cn_callback); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | void pohmelfs_config_exit(void) |
| 589 | { |
| 590 | struct pohmelfs_config *c, *tmp; |
| 591 | struct pohmelfs_config_group *g, *gtmp; |
| 592 | |
| 593 | cn_del_callback(&pohmelfs_cn_id); |
| 594 | |
| 595 | mutex_lock(&pohmelfs_config_lock); |
| 596 | list_for_each_entry_safe(g, gtmp, &pohmelfs_config_list, group_entry) { |
| 597 | list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| 598 | list_del(&c->config_entry); |
| 599 | kfree(c); |
| 600 | } |
| 601 | |
| 602 | list_del(&g->group_entry); |
| 603 | |
Ilia Mirkin | 1491017 | 2011-03-13 00:29:03 -0500 | [diff] [blame] | 604 | kfree(g->hash_string); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 605 | |
Ilia Mirkin | 1491017 | 2011-03-13 00:29:03 -0500 | [diff] [blame] | 606 | kfree(g->cipher_string); |
Evgeniy Polyakov | 9ce8b61 | 2009-02-09 17:02:35 +0300 | [diff] [blame] | 607 | |
| 608 | kfree(g); |
| 609 | } |
| 610 | mutex_unlock(&pohmelfs_config_lock); |
| 611 | } |