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 create 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 = kmemdup(g->hash_key, g->hash_keysize,
210 goto err_out_free_cipher_string;
211 psb->hash_keysize = g->hash_keysize;
214 if (g->cipher_keysize) {
215 psb->cipher_key = kmemdup(g->cipher_key, g->cipher_keysize,
217 if (!psb->cipher_key)
218 goto err_out_free_hash;
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 = kzalloc(sizeof(struct pohmelfs_cn_ack), GFP_KERNEL);
245 memcpy(&ack->msg, msg, sizeof(struct cn_msg));
247 if (action == POHMELFS_CTLINFO_ACK)
248 memcpy(&ack->ctl, ctl, sizeof(struct pohmelfs_ctl));
250 ack->msg.len = sizeof(struct pohmelfs_cn_ack) - sizeof(struct cn_msg);
251 ack->msg.ack = msg->ack + 1;
253 ack->msg_num = msg_num;
255 cn_netlink_send(&ack->msg, 0, GFP_KERNEL);
260 static int pohmelfs_cn_disp(struct cn_msg *msg)
262 struct pohmelfs_config_group *g;
263 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
264 struct pohmelfs_config *c, *tmp;
267 if (msg->len != sizeof(struct pohmelfs_ctl))
270 mutex_lock(&pohmelfs_config_lock);
272 g = pohmelfs_find_config_group(ctl->idx);
274 pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL);
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)) {
288 mutex_unlock(&pohmelfs_config_lock);
292 static int pohmelfs_cn_dump(struct cn_msg *msg)
294 struct pohmelfs_config_group *g;
295 struct pohmelfs_config *c, *tmp;
299 if (msg->len != sizeof(struct pohmelfs_ctl))
302 mutex_lock(&pohmelfs_config_lock);
304 list_for_each_entry(g, &pohmelfs_config_list, group_entry)
305 total_msg += g->num_entry;
306 if (total_msg == 0) {
307 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
312 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
313 list_for_each_entry_safe(c, tmp, &g->config_list,
315 struct pohmelfs_ctl *sc = &c->state.ctl;
316 if (pohmelfs_send_reply(err, total_msg - i,
317 POHMELFS_CTLINFO_ACK, msg,
327 mutex_unlock(&pohmelfs_config_lock);
331 static int pohmelfs_cn_flush(struct cn_msg *msg)
333 struct pohmelfs_config_group *g;
334 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
335 struct pohmelfs_config *c, *tmp;
338 if (msg->len != sizeof(struct pohmelfs_ctl))
341 mutex_lock(&pohmelfs_config_lock);
343 if (ctl->idx != POHMELFS_NULL_IDX) {
344 g = pohmelfs_find_config_group(ctl->idx);
349 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
350 list_del(&c->config_entry);
355 list_for_each_entry(g, &pohmelfs_config_list, group_entry) {
356 list_for_each_entry_safe(c, tmp, &g->config_list,
358 list_del(&c->config_entry);
366 mutex_unlock(&pohmelfs_config_lock);
367 pohmelfs_cn_dump(msg);
372 static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new)
374 old->perm = new->perm;
375 old->prio = new->prio;
379 static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
381 struct pohmelfs_config_group *g;
382 struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data;
383 struct pohmelfs_config *c, *tmp;
386 if (msg->len != sizeof(struct pohmelfs_ctl))
389 mutex_lock(&pohmelfs_config_lock);
391 g = pohmelfs_find_create_config_group(ctl->idx);
397 list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) {
398 struct pohmelfs_ctl *sc = &c->state.ctl;
400 if (pohmelfs_config_eql(sc, ctl)) {
401 if (action == POHMELFS_FLAGS_ADD) {
404 } else if (action == POHMELFS_FLAGS_DEL) {
405 list_del(&c->config_entry);
409 } else if (action == POHMELFS_FLAGS_MODIFY) {
410 err = pohmelfs_modify_config(sc, ctl);
418 if (action == POHMELFS_FLAGS_DEL) {
423 c = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL);
428 memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl));
431 list_add_tail(&c->config_entry, &g->config_list);
434 mutex_unlock(&pohmelfs_config_lock);
435 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
441 static int pohmelfs_crypto_hash_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
443 char *algo = (char *)c->data;
444 u8 *key = (u8 *)(algo + c->strlen);
449 g->hash_string = kstrdup(algo, GFP_KERNEL);
452 g->hash_strlen = c->strlen;
453 g->hash_keysize = c->keysize;
455 g->hash_key = kmemdup(key, c->keysize, GFP_KERNEL);
457 kfree(g->hash_string);
464 static int pohmelfs_crypto_cipher_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c)
466 char *algo = (char *)c->data;
467 u8 *key = (u8 *)(algo + c->strlen);
469 if (g->cipher_string)
472 g->cipher_string = kstrdup(algo, GFP_KERNEL);
473 if (!g->cipher_string)
475 g->cipher_strlen = c->strlen;
476 g->cipher_keysize = c->keysize;
478 g->cipher_key = kmemdup(key, c->keysize, GFP_KERNEL);
479 if (!g->cipher_key) {
480 kfree(g->cipher_string);
487 static int pohmelfs_cn_crypto(struct cn_msg *msg)
489 struct pohmelfs_crypto *crypto = (struct pohmelfs_crypto *)msg->data;
490 struct pohmelfs_config_group *g;
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);
497 mutex_lock(&pohmelfs_config_lock);
498 g = pohmelfs_find_create_config_group(crypto->idx);
504 switch (crypto->type) {
505 case POHMELFS_CRYPTO_HASH:
506 err = pohmelfs_crypto_hash_init(g, crypto);
508 case POHMELFS_CRYPTO_CIPHER:
509 err = pohmelfs_crypto_cipher_init(g, crypto);
517 mutex_unlock(&pohmelfs_config_lock);
518 if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL))
524 static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
528 if (!cap_raised(current_cap(), CAP_SYS_ADMIN))
531 switch (msg->flags) {
532 case POHMELFS_FLAGS_ADD:
533 case POHMELFS_FLAGS_DEL:
534 case POHMELFS_FLAGS_MODIFY:
535 err = pohmelfs_cn_ctl(msg, msg->flags);
537 case POHMELFS_FLAGS_FLUSH:
538 err = pohmelfs_cn_flush(msg);
540 case POHMELFS_FLAGS_SHOW:
541 err = pohmelfs_cn_disp(msg);
543 case POHMELFS_FLAGS_DUMP:
544 err = pohmelfs_cn_dump(msg);
546 case POHMELFS_FLAGS_CRYPTO:
547 err = pohmelfs_cn_crypto(msg);
555 int pohmelfs_config_check(struct pohmelfs_config *config, int idx)
557 struct pohmelfs_ctl *ctl = &config->state.ctl;
558 struct pohmelfs_config *tmp;
560 struct pohmelfs_ctl *sc;
561 struct pohmelfs_config_group *g;
563 mutex_lock(&pohmelfs_config_lock);
565 g = pohmelfs_find_config_group(ctl->idx);
567 list_for_each_entry(tmp, &g->config_list, config_entry) {
568 sc = &tmp->state.ctl;
570 if (pohmelfs_config_eql(sc, ctl)) {
577 mutex_unlock(&pohmelfs_config_lock);
582 int __init pohmelfs_config_init(void)
584 /* XXX remove (void *) cast when vanilla connector got synced */
585 return cn_add_callback(&pohmelfs_cn_id, "pohmelfs", (void *)pohmelfs_cn_callback);
588 void pohmelfs_config_exit(void)
590 struct pohmelfs_config *c, *tmp;
591 struct pohmelfs_config_group *g, *gtmp;
593 cn_del_callback(&pohmelfs_cn_id);
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);
602 list_del(&g->group_entry);
604 kfree(g->hash_string);
606 kfree(g->cipher_string);
610 mutex_unlock(&pohmelfs_config_lock);