| /* |
| * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/connector.h> |
| #include <linux/crypto.h> |
| #include <linux/list.h> |
| #include <linux/mutex.h> |
| #include <linux/string.h> |
| #include <linux/in.h> |
| #include <linux/slab.h> |
| |
| #include "netfs.h" |
| |
| /* |
| * Global configuration list. |
| * Each client can be asked to get one of them. |
| * |
| * Allows to provide remote server address (ipv4/v6/whatever), port |
| * and so on via kernel connector. |
| */ |
| |
| static struct cb_id pohmelfs_cn_id = {.idx = POHMELFS_CN_IDX, .val = POHMELFS_CN_VAL}; |
| static LIST_HEAD(pohmelfs_config_list); |
| static DEFINE_MUTEX(pohmelfs_config_lock); |
| |
| static inline int pohmelfs_config_eql(struct pohmelfs_ctl *sc, struct pohmelfs_ctl *ctl) |
| { |
| if (sc->idx == ctl->idx && sc->type == ctl->type && |
| sc->proto == ctl->proto && |
| sc->addrlen == ctl->addrlen && |
| !memcmp(&sc->addr, &ctl->addr, ctl->addrlen)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static struct pohmelfs_config_group *pohmelfs_find_config_group(unsigned int idx) |
| { |
| struct pohmelfs_config_group *g, *group = NULL; |
| |
| list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
| if (g->idx == idx) { |
| group = g; |
| break; |
| } |
| } |
| |
| return group; |
| } |
| |
| static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned int idx) |
| { |
| struct pohmelfs_config_group *g; |
| |
| g = pohmelfs_find_config_group(idx); |
| if (g) |
| return g; |
| |
| g = kzalloc(sizeof(struct pohmelfs_config_group), GFP_KERNEL); |
| if (!g) |
| return NULL; |
| |
| INIT_LIST_HEAD(&g->config_list); |
| g->idx = idx; |
| g->num_entry = 0; |
| |
| list_add_tail(&g->group_entry, &pohmelfs_config_list); |
| |
| return g; |
| } |
| |
| static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst) |
| { |
| struct pohmelfs_config *tmp; |
| |
| INIT_LIST_HEAD(&dst->config_entry); |
| |
| list_for_each_entry(tmp, &psb->state_list, config_entry) { |
| if (dst->state.ctl.prio > tmp->state.ctl.prio) |
| list_add_tail(&dst->config_entry, &tmp->config_entry); |
| } |
| if (list_empty(&dst->config_entry)) |
| list_add_tail(&dst->config_entry, &psb->state_list); |
| } |
| |
| static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb, |
| struct pohmelfs_config *dst, struct pohmelfs_config *new) |
| { |
| if ((dst->state.ctl.prio == new->state.ctl.prio) && |
| (dst->state.ctl.perm == new->state.ctl.perm)) |
| return 0; |
| |
| dprintk("%s: dst: prio: %d, perm: %x, new: prio: %d, perm: %d.\n", |
| __func__, dst->state.ctl.prio, dst->state.ctl.perm, |
| new->state.ctl.prio, new->state.ctl.perm); |
| dst->state.ctl.prio = new->state.ctl.prio; |
| dst->state.ctl.perm = new->state.ctl.perm; |
| |
| list_del_init(&dst->config_entry); |
| pohmelfs_insert_config_entry(psb, dst); |
| return 0; |
| } |
| |
| /* |
| * pohmelfs_copy_config() is used to copy new state configs from the |
| * config group (controlled by the netlink messages) into the superblock. |
| * This happens either at startup time where no transactions can access |
| * the list of the configs (and thus list of the network states), or at |
| * run-time, where it is protected by the psb->state_lock. |
| */ |
| int pohmelfs_copy_config(struct pohmelfs_sb *psb) |
| { |
| struct pohmelfs_config_group *g; |
| struct pohmelfs_config *c, *dst; |
| int err = -ENODEV; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| g = pohmelfs_find_config_group(psb->idx); |
| if (!g) |
| goto out_unlock; |
| |
| /* |
| * Run over all entries in given config group and try to crate and |
| * initialize those, which do not exist in superblock list. |
| * Skip all existing entries. |
| */ |
| |
| list_for_each_entry(c, &g->config_list, config_entry) { |
| err = 0; |
| list_for_each_entry(dst, &psb->state_list, config_entry) { |
| if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) { |
| err = pohmelfs_move_config_entry(psb, dst, c); |
| if (!err) |
| err = -EEXIST; |
| break; |
| } |
| } |
| |
| if (err) |
| continue; |
| |
| dst = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL); |
| if (!dst) { |
| err = -ENOMEM; |
| break; |
| } |
| |
| memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl)); |
| |
| pohmelfs_insert_config_entry(psb, dst); |
| |
| err = pohmelfs_state_init_one(psb, dst); |
| if (err) { |
| list_del(&dst->config_entry); |
| kfree(dst); |
| } |
| |
| err = 0; |
| } |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| |
| return err; |
| } |
| |
| int pohmelfs_copy_crypto(struct pohmelfs_sb *psb) |
| { |
| struct pohmelfs_config_group *g; |
| int err = -ENOENT; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| g = pohmelfs_find_config_group(psb->idx); |
| if (!g) |
| goto err_out_exit; |
| |
| if (g->hash_string) { |
| err = -ENOMEM; |
| psb->hash_string = kstrdup(g->hash_string, GFP_KERNEL); |
| if (!psb->hash_string) |
| goto err_out_exit; |
| psb->hash_strlen = g->hash_strlen; |
| } |
| |
| if (g->cipher_string) { |
| psb->cipher_string = kstrdup(g->cipher_string, GFP_KERNEL); |
| if (!psb->cipher_string) |
| goto err_out_free_hash_string; |
| psb->cipher_strlen = g->cipher_strlen; |
| } |
| |
| if (g->hash_keysize) { |
| psb->hash_key = kmemdup(g->hash_key, g->hash_keysize, |
| GFP_KERNEL); |
| if (!psb->hash_key) |
| goto err_out_free_cipher_string; |
| psb->hash_keysize = g->hash_keysize; |
| } |
| |
| if (g->cipher_keysize) { |
| psb->cipher_key = kmemdup(g->cipher_key, g->cipher_keysize, |
| GFP_KERNEL); |
| if (!psb->cipher_key) |
| goto err_out_free_hash; |
| psb->cipher_keysize = g->cipher_keysize; |
| } |
| |
| mutex_unlock(&pohmelfs_config_lock); |
| |
| return 0; |
| |
| err_out_free_hash: |
| kfree(psb->hash_key); |
| err_out_free_cipher_string: |
| kfree(psb->cipher_string); |
| err_out_free_hash_string: |
| kfree(psb->hash_string); |
| err_out_exit: |
| mutex_unlock(&pohmelfs_config_lock); |
| return err; |
| } |
| |
| static int pohmelfs_send_reply(int err, int msg_num, int action, struct cn_msg *msg, struct pohmelfs_ctl *ctl) |
| { |
| struct pohmelfs_cn_ack *ack; |
| |
| ack = kzalloc(sizeof(struct pohmelfs_cn_ack), GFP_KERNEL); |
| if (!ack) |
| return -ENOMEM; |
| |
| memcpy(&ack->msg, msg, sizeof(struct cn_msg)); |
| |
| if (action == POHMELFS_CTLINFO_ACK) |
| memcpy(&ack->ctl, ctl, sizeof(struct pohmelfs_ctl)); |
| |
| ack->msg.len = sizeof(struct pohmelfs_cn_ack) - sizeof(struct cn_msg); |
| ack->msg.ack = msg->ack + 1; |
| ack->error = err; |
| ack->msg_num = msg_num; |
| |
| cn_netlink_send(&ack->msg, 0, GFP_KERNEL); |
| kfree(ack); |
| return 0; |
| } |
| |
| static int pohmelfs_cn_disp(struct cn_msg *msg) |
| { |
| struct pohmelfs_config_group *g; |
| struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| struct pohmelfs_config *c, *tmp; |
| int err = 0, i = 1; |
| |
| if (msg->len != sizeof(struct pohmelfs_ctl)) |
| return -EBADMSG; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| g = pohmelfs_find_config_group(ctl->idx); |
| if (!g) { |
| pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL); |
| goto out_unlock; |
| } |
| |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| struct pohmelfs_ctl *sc = &c->state.ctl; |
| if (pohmelfs_send_reply(err, g->num_entry - i, POHMELFS_CTLINFO_ACK, msg, sc)) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| i += 1; |
| } |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| return err; |
| } |
| |
| static int pohmelfs_cn_dump(struct cn_msg *msg) |
| { |
| struct pohmelfs_config_group *g; |
| struct pohmelfs_config *c, *tmp; |
| int err = 0, i = 1; |
| int total_msg = 0; |
| |
| if (msg->len != sizeof(struct pohmelfs_ctl)) |
| return -EBADMSG; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
| if (g) |
| total_msg += g->num_entry; |
| } |
| if (total_msg == 0) { |
| if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
| if (g) { |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| struct pohmelfs_ctl *sc = &c->state.ctl; |
| if (pohmelfs_send_reply(err, total_msg - i, POHMELFS_CTLINFO_ACK, msg, sc)) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| i += 1; |
| } |
| } |
| } |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| return err; |
| } |
| |
| static int pohmelfs_cn_flush(struct cn_msg *msg) |
| { |
| struct pohmelfs_config_group *g; |
| struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| struct pohmelfs_config *c, *tmp; |
| int err = 0; |
| |
| if (msg->len != sizeof(struct pohmelfs_ctl)) |
| return -EBADMSG; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| if (ctl->idx != POHMELFS_NULL_IDX) { |
| g = pohmelfs_find_config_group(ctl->idx); |
| |
| if (!g) |
| goto out_unlock; |
| |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| list_del(&c->config_entry); |
| g->num_entry--; |
| kfree(c); |
| } |
| } else { |
| list_for_each_entry(g, &pohmelfs_config_list, group_entry) { |
| if (g) { |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| list_del(&c->config_entry); |
| g->num_entry--; |
| kfree(c); |
| } |
| } |
| } |
| } |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| pohmelfs_cn_dump(msg); |
| |
| return err; |
| } |
| |
| static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new) |
| { |
| old->perm = new->perm; |
| old->prio = new->prio; |
| return 0; |
| } |
| |
| static int pohmelfs_cn_ctl(struct cn_msg *msg, int action) |
| { |
| struct pohmelfs_config_group *g; |
| struct pohmelfs_ctl *ctl = (struct pohmelfs_ctl *)msg->data; |
| struct pohmelfs_config *c, *tmp; |
| int err = 0; |
| |
| if (msg->len != sizeof(struct pohmelfs_ctl)) |
| return -EBADMSG; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| g = pohmelfs_find_create_config_group(ctl->idx); |
| if (!g) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| struct pohmelfs_ctl *sc = &c->state.ctl; |
| |
| if (pohmelfs_config_eql(sc, ctl)) { |
| if (action == POHMELFS_FLAGS_ADD) { |
| err = -EEXIST; |
| goto out_unlock; |
| } else if (action == POHMELFS_FLAGS_DEL) { |
| list_del(&c->config_entry); |
| g->num_entry--; |
| kfree(c); |
| goto out_unlock; |
| } else if (action == POHMELFS_FLAGS_MODIFY) { |
| err = pohmelfs_modify_config(sc, ctl); |
| goto out_unlock; |
| } else { |
| err = -EEXIST; |
| goto out_unlock; |
| } |
| } |
| } |
| if (action == POHMELFS_FLAGS_DEL) { |
| err = -EBADMSG; |
| goto out_unlock; |
| } |
| |
| c = kzalloc(sizeof(struct pohmelfs_config), GFP_KERNEL); |
| if (!c) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl)); |
| g->num_entry++; |
| |
| list_add_tail(&c->config_entry, &g->config_list); |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| err = -ENOMEM; |
| |
| return err; |
| } |
| |
| static int pohmelfs_crypto_hash_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c) |
| { |
| char *algo = (char *)c->data; |
| u8 *key = (u8 *)(algo + c->strlen); |
| |
| if (g->hash_string) |
| return -EEXIST; |
| |
| g->hash_string = kstrdup(algo, GFP_KERNEL); |
| if (!g->hash_string) |
| return -ENOMEM; |
| g->hash_strlen = c->strlen; |
| g->hash_keysize = c->keysize; |
| |
| g->hash_key = kmemdup(key, c->keysize, GFP_KERNEL); |
| if (!g->hash_key) { |
| kfree(g->hash_string); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static int pohmelfs_crypto_cipher_init(struct pohmelfs_config_group *g, struct pohmelfs_crypto *c) |
| { |
| char *algo = (char *)c->data; |
| u8 *key = (u8 *)(algo + c->strlen); |
| |
| if (g->cipher_string) |
| return -EEXIST; |
| |
| g->cipher_string = kstrdup(algo, GFP_KERNEL); |
| if (!g->cipher_string) |
| return -ENOMEM; |
| g->cipher_strlen = c->strlen; |
| g->cipher_keysize = c->keysize; |
| |
| g->cipher_key = kmemdup(key, c->keysize, GFP_KERNEL); |
| if (!g->cipher_key) { |
| kfree(g->cipher_string); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static int pohmelfs_cn_crypto(struct cn_msg *msg) |
| { |
| struct pohmelfs_crypto *crypto = (struct pohmelfs_crypto *)msg->data; |
| struct pohmelfs_config_group *g; |
| int err = 0; |
| |
| dprintk("%s: idx: %u, strlen: %u, type: %u, keysize: %u, algo: %s.\n", |
| __func__, crypto->idx, crypto->strlen, crypto->type, |
| crypto->keysize, (char *)crypto->data); |
| |
| mutex_lock(&pohmelfs_config_lock); |
| g = pohmelfs_find_create_config_group(crypto->idx); |
| if (!g) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| switch (crypto->type) { |
| case POHMELFS_CRYPTO_HASH: |
| err = pohmelfs_crypto_hash_init(g, crypto); |
| break; |
| case POHMELFS_CRYPTO_CIPHER: |
| err = pohmelfs_crypto_cipher_init(g, crypto); |
| break; |
| default: |
| err = -ENOTSUPP; |
| break; |
| } |
| |
| out_unlock: |
| mutex_unlock(&pohmelfs_config_lock); |
| if (pohmelfs_send_reply(err, 0, POHMELFS_NOINFO_ACK, msg, NULL)) |
| err = -ENOMEM; |
| |
| return err; |
| } |
| |
| static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) |
| { |
| int err; |
| |
| if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) |
| return; |
| |
| switch (msg->flags) { |
| case POHMELFS_FLAGS_ADD: |
| case POHMELFS_FLAGS_DEL: |
| case POHMELFS_FLAGS_MODIFY: |
| err = pohmelfs_cn_ctl(msg, msg->flags); |
| break; |
| case POHMELFS_FLAGS_FLUSH: |
| err = pohmelfs_cn_flush(msg); |
| break; |
| case POHMELFS_FLAGS_SHOW: |
| err = pohmelfs_cn_disp(msg); |
| break; |
| case POHMELFS_FLAGS_DUMP: |
| err = pohmelfs_cn_dump(msg); |
| break; |
| case POHMELFS_FLAGS_CRYPTO: |
| err = pohmelfs_cn_crypto(msg); |
| break; |
| default: |
| err = -ENOSYS; |
| break; |
| } |
| } |
| |
| int pohmelfs_config_check(struct pohmelfs_config *config, int idx) |
| { |
| struct pohmelfs_ctl *ctl = &config->state.ctl; |
| struct pohmelfs_config *tmp; |
| int err = -ENOENT; |
| struct pohmelfs_ctl *sc; |
| struct pohmelfs_config_group *g; |
| |
| mutex_lock(&pohmelfs_config_lock); |
| |
| g = pohmelfs_find_config_group(ctl->idx); |
| if (g) { |
| list_for_each_entry(tmp, &g->config_list, config_entry) { |
| sc = &tmp->state.ctl; |
| |
| if (pohmelfs_config_eql(sc, ctl)) { |
| err = 0; |
| break; |
| } |
| } |
| } |
| |
| mutex_unlock(&pohmelfs_config_lock); |
| |
| return err; |
| } |
| |
| int __init pohmelfs_config_init(void) |
| { |
| /* XXX remove (void *) cast when vanilla connector got synced */ |
| return cn_add_callback(&pohmelfs_cn_id, "pohmelfs", (void *)pohmelfs_cn_callback); |
| } |
| |
| void pohmelfs_config_exit(void) |
| { |
| struct pohmelfs_config *c, *tmp; |
| struct pohmelfs_config_group *g, *gtmp; |
| |
| cn_del_callback(&pohmelfs_cn_id); |
| |
| mutex_lock(&pohmelfs_config_lock); |
| list_for_each_entry_safe(g, gtmp, &pohmelfs_config_list, group_entry) { |
| list_for_each_entry_safe(c, tmp, &g->config_list, config_entry) { |
| list_del(&c->config_entry); |
| kfree(c); |
| } |
| |
| list_del(&g->group_entry); |
| |
| if (g->hash_string) |
| kfree(g->hash_string); |
| |
| if (g->cipher_string) |
| kfree(g->cipher_string); |
| |
| kfree(g); |
| } |
| mutex_unlock(&pohmelfs_config_lock); |
| } |