2 * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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.
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.
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>
23 #include <linux/slab.h>
28 * Global configuration list.
29 * Each client can be asked to get one of them.
31 * Allows to provide remote server address (ipv4/v6/whatever), port
32 * and so on via kernel connector.
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);
39 static inline int pohmelfs_config_eql(struct pohmelfs_ctl *sc, struct pohmelfs_ctl *ctl)
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))
50 static struct pohmelfs_config_group *pohmelfs_find_config_group(unsigned int idx)
52 struct pohmelfs_config_group *g, *group = NULL;
54 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
64 static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned int idx)
66 struct pohmelfs_config_group *g;
68 g = pohmelfs_find_config_group(idx);
72 g = kzalloc(sizeof(struct pohmelfs_config_group), GFP_KERNEL);
76 INIT_LIST_HEAD(&g->config_list);
80 list_add_tail(&g->group_entry, &pohmelfs_config_list);
85 static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst)
87 struct pohmelfs_config *tmp;
89 INIT_LIST_HEAD(&dst->config_entry);
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);
95 if (list_empty(&dst->config_entry))
96 list_add_tail(&dst->config_entry, &psb->state_list);
99 static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb,
100 struct pohmelfs_config *dst, struct pohmelfs_config *new)
102 if ((dst->state.ctl.prio == new->state.ctl.prio) &&
103 (dst->state.ctl.perm == new->state.ctl.perm))
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;
112 list_del_init(&dst->config_entry);
113 pohmelfs_insert_config_entry(psb, dst);
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.
124 int pohmelfs_copy_config(struct pohmelfs_sb *psb)
126 struct pohmelfs_config_group *g;
127 struct pohmelfs_config *c, *dst;
130 mutex_lock(&pohmelfs_config_lock);
132 g = pohmelfs_find_config_group(psb->idx);
137 * Run over all entries in given config group and try to crate and
138 * initialize those, which do not exist in superblock list.
139 * Skip all existing entries.
142 list_for_each_entry(c, &g->config_list, config_entry) {
144 list_for_each_entry(dst, &psb->state_list, config_entry) {
145 if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) {
146 err = pohmelfs_move_config_entry(psb, dst, c);
156 dst = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL);
162 memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl));
164 pohmelfs_insert_config_entry(psb, dst);
166 err = pohmelfs_state_init_one(psb, dst);
168 list_del(&dst->config_entry);
176 mutex_unlock(&pohmelfs_config_lock);
181 int pohmelfs_copy_crypto(struct pohmelfs_sb *psb)
183 struct pohmelfs_config_group *g;
186 mutex_lock(&pohmelfs_config_lock);
187 g = pohmelfs_find_config_group(psb->idx);
191 if (g->hash_string) {
193 psb->hash_string = kstrdup(g->hash_string, GFP_KERNEL);
194 if (!psb->hash_string)
196 psb->hash_strlen = g->hash_strlen;
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;
206 if (g->hash_keysize) {
207 psb->hash_key = kmalloc(g->hash_keysize, GFP_KERNEL);
209 goto err_out_free_cipher_string;
210 memcpy(psb->hash_key, g->hash_key, g->hash_keysize);
211 psb->hash_keysize = g->hash_keysize;
214 if (g->cipher_keysize) {
215 psb->cipher_key = kmalloc(g->cipher_keysize, GFP_KERNEL);
216 if (!psb->cipher_key)
217 goto err_out_free_hash;
218 memcpy(psb->cipher_key, g->cipher_key, g->cipher_keysize);
219 psb->cipher_keysize = g->cipher_keysize;
222 mutex_unlock(&pohmelfs_config_lock);
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);
233 mutex_unlock(&pohmelfs_config_lock);
237 static int pohmelfs_send_reply(int err, int msg_num, int action, struct cn_msg *msg, struct pohmelfs_ctl *ctl)
239 struct pohmelfs_cn_ack *ack;
241 ack = kmalloc(sizeof(struct pohmelfs_cn_ack), GFP_KERNEL);
245 memset(ack, 0, sizeof(struct pohmelfs_cn_ack));
246 memcpy(&ack->msg, msg, sizeof(struct cn_msg));
248 if (action == POHMELFS_CTLINFO_ACK)
249 memcpy(&ack->ctl, ctl, sizeof(struct pohmelfs_ctl));
251 ack->msg.len = sizeof(struct pohmelfs_cn_ack) - sizeof(struct cn_msg);
252 ack->msg.ack = msg->ack + 1;
254 ack->msg_num = msg_num;
256 cn_netlink_send(&ack->msg, 0, GFP_KERNEL);
261 static int pohmelfs_cn_disp(struct cn_msg *msg)
263 struct pohmelfs_config_group *g;
264 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
265 struct pohmelfs_config *c, *tmp;
268 if (msg->len != sizeof(struct pohmelfs_ctl))
271 mutex_lock(&pohmelfs_config_lock);
273 g = pohmelfs_find_config_group(ctl->idx);
275 pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL);
279 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
280 struct pohmelfs_ctl *sc = &c->state.ctl;
281 if (pohmelfs_send_reply(err, g->num_entry - i, POHMELFS_CTLINFO_ACK, msg, sc)) {
289 mutex_unlock(&pohmelfs_config_lock);
293 static int pohmelfs_cn_dump(struct cn_msg *msg)
295 struct pohmelfs_config_group *g;
296 struct pohmelfs_config *c, *tmp;
300 if (msg->len != sizeof(struct pohmelfs_ctl))
303 mutex_lock(&pohmelfs_config_lock);
305 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
307 total_msg += g->num_entry;
309 if (total_msg == 0) {
310 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
315 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
317 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
318 struct pohmelfs_ctl *sc = &c->state.ctl;
319 if (pohmelfs_send_reply(err, total_msg - i, POHMELFS_CTLINFO_ACK, msg, sc)) {
329 mutex_unlock(&pohmelfs_config_lock);
333 static int pohmelfs_cn_flush(struct cn_msg *msg)
335 struct pohmelfs_config_group *g;
336 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
337 struct pohmelfs_config *c, *tmp;
340 if (msg->len != sizeof(struct pohmelfs_ctl))
343 mutex_lock(&pohmelfs_config_lock);
345 if (ctl->idx != POHMELFS_NULL_IDX) {
346 g = pohmelfs_find_config_group(ctl->idx);
351 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
352 list_del(&c->config_entry);
357 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
359 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
360 list_del(&c->config_entry);
369 mutex_unlock(&pohmelfs_config_lock);
370 pohmelfs_cn_dump(msg);
375 static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new)
377 old->perm = new->perm;
378 old->prio = new->prio;
382 static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
384 struct pohmelfs_config_group *g;
385 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
386 struct pohmelfs_config *c, *tmp;
389 if (msg->len != sizeof(struct pohmelfs_ctl))
392 mutex_lock(&pohmelfs_config_lock);
394 g = pohmelfs_find_create_config_group(ctl->idx);
400 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
401 struct pohmelfs_ctl *sc = &c->state.ctl;
403 if (pohmelfs_config_eql(sc, ctl)) {
404 if (action == POHMELFS_FLAGS_ADD) {
407 } else if (action == POHMELFS_FLAGS_DEL) {
408 list_del(&c->config_entry);
412 } else if (action == POHMELFS_FLAGS_MODIFY) {
413 err = pohmelfs_modify_config(sc, ctl);
421 if (action == POHMELFS_FLAGS_DEL) {
426 c = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL);
431 memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl));
434 list_add_tail(&c->config_entry, &g->config_list);
437 mutex_unlock(&pohmelfs_config_lock);
438 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
444 static int pohmelfs_crypto_hash_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
446 char *algo = (char *)c->data;
447 u8 *key = (u8 *)(algo + c->strlen);
452 g->hash_string = kstrdup(algo, GFP_KERNEL);
455 g->hash_strlen = c->strlen;
456 g->hash_keysize = c->keysize;
458 g->hash_key = kmalloc(c->keysize, GFP_KERNEL);
460 kfree(g->hash_string);
464 memcpy(g->hash_key, key, c->keysize);
469 static int pohmelfs_crypto_cipher_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
471 char *algo = (char *)c->data;
472 u8 *key = (u8 *)(algo + c->strlen);
474 if (g->cipher_string)
477 g->cipher_string = kstrdup(algo, GFP_KERNEL);
478 if (!g->cipher_string)
480 g->cipher_strlen = c->strlen;
481 g->cipher_keysize = c->keysize;
483 g->cipher_key = kmalloc(c->keysize, GFP_KERNEL);
484 if (!g->cipher_key) {
485 kfree(g->cipher_string);
489 memcpy(g->cipher_key, key, c->keysize);
494 static int pohmelfs_cn_crypto(struct cn_msg *msg)
496 struct pohmelfs_crypto *crypto = (struct pohmelfs_crypto *)msg->data;
497 struct pohmelfs_config_group *g;
500 dprintk("%s: idx: %u, strlen: %u, type: %u, keysize: %u, algo: %s.\n",
501 __func__, crypto->idx, crypto->strlen, crypto->type,
502 crypto->keysize, (char *)crypto->data);
504 mutex_lock(&pohmelfs_config_lock);
505 g = pohmelfs_find_create_config_group(crypto->idx);
511 switch (crypto->type) {
512 case POHMELFS_CRYPTO_HASH:
513 err = pohmelfs_crypto_hash_init(g, crypto);
515 case POHMELFS_CRYPTO_CIPHER:
516 err = pohmelfs_crypto_cipher_init(g, crypto);
524 mutex_unlock(&pohmelfs_config_lock);
525 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
531 static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
535 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN))
538 switch (msg->flags) {
539 case POHMELFS_FLAGS_ADD:
540 case POHMELFS_FLAGS_DEL:
541 case POHMELFS_FLAGS_MODIFY:
542 err = pohmelfs_cn_ctl(msg, msg->flags);
544 case POHMELFS_FLAGS_FLUSH:
545 err = pohmelfs_cn_flush(msg);
547 case POHMELFS_FLAGS_SHOW:
548 err = pohmelfs_cn_disp(msg);
550 case POHMELFS_FLAGS_DUMP:
551 err = pohmelfs_cn_dump(msg);
553 case POHMELFS_FLAGS_CRYPTO:
554 err = pohmelfs_cn_crypto(msg);
562 int pohmelfs_config_check(struct pohmelfs_config *config, int idx)
564 struct pohmelfs_ctl *ctl = &config->state.ctl;
565 struct pohmelfs_config *tmp;
567 struct pohmelfs_ctl *sc;
568 struct pohmelfs_config_group *g;
570 mutex_lock(&pohmelfs_config_lock);
572 g = pohmelfs_find_config_group(ctl->idx);
574 list_for_each_entry(tmp, &g->config_list, config_entry) {
575 sc = &tmp->state.ctl;
577 if (pohmelfs_config_eql(sc, ctl)) {
584 mutex_unlock(&pohmelfs_config_lock);
589 int __init pohmelfs_config_init(void)
591 /* XXX remove (void *) cast when vanilla connector got synced */
592 return cn_add_callback(&pohmelfs_cn_id, "pohmelfs", (void *)pohmelfs_cn_callback);
595 void pohmelfs_config_exit(void)
597 struct pohmelfs_config *c, *tmp;
598 struct pohmelfs_config_group *g, *gtmp;
600 cn_del_callback(&pohmelfs_cn_id);
602 mutex_lock(&pohmelfs_config_lock);
603 list_for_each_entry_safe(g, gtmp, &pohmelfs_config_list, group_entry) {
604 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
605 list_del(&c->config_entry);
609 list_del(&g->group_entry);
612 kfree(g->hash_string);
614 if (g->cipher_string)
615 kfree(g->cipher_string);
619 mutex_unlock(&pohmelfs_config_lock);