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/*
* Copyright (C) 2014 Fraunhofer ITWM
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
*
* Written by:
* Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
*/
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/completion.h>
#include <net/ieee802154.h>
#include "mac802154.h"
#include "llsec.h"
static void llsec_key_put(struct mac802154_llsec_key *key);
static bool llsec_key_id_equal(const struct ieee802154_llsec_key_id *a,
const struct ieee802154_llsec_key_id *b);
static void llsec_dev_free(struct mac802154_llsec_device *dev);
void mac802154_llsec_init(struct mac802154_llsec *sec)
{
memset(sec, 0, sizeof(*sec));
memset(&sec->params.default_key_source, 0xFF, IEEE802154_ADDR_LEN);
INIT_LIST_HEAD(&sec->table.security_levels);
INIT_LIST_HEAD(&sec->table.devices);
INIT_LIST_HEAD(&sec->table.keys);
hash_init(sec->devices_short);
hash_init(sec->devices_hw);
rwlock_init(&sec->lock);
}
void mac802154_llsec_destroy(struct mac802154_llsec *sec)
{
struct ieee802154_llsec_seclevel *sl, *sn;
struct ieee802154_llsec_device *dev, *dn;
struct ieee802154_llsec_key_entry *key, *kn;
list_for_each_entry_safe(sl, sn, &sec->table.security_levels, list) {
struct mac802154_llsec_seclevel *msl;
msl = container_of(sl, struct mac802154_llsec_seclevel, level);
list_del(&sl->list);
kfree(msl);
}
list_for_each_entry_safe(dev, dn, &sec->table.devices, list) {
struct mac802154_llsec_device *mdev;
mdev = container_of(dev, struct mac802154_llsec_device, dev);
list_del(&dev->list);
llsec_dev_free(mdev);
}
list_for_each_entry_safe(key, kn, &sec->table.keys, list) {
struct mac802154_llsec_key *mkey;
mkey = container_of(key->key, struct mac802154_llsec_key, key);
list_del(&key->list);
llsec_key_put(mkey);
kfree(key);
}
}
int mac802154_llsec_get_params(struct mac802154_llsec *sec,
struct ieee802154_llsec_params *params)
{
read_lock_bh(&sec->lock);
*params = sec->params;
read_unlock_bh(&sec->lock);
return 0;
}
int mac802154_llsec_set_params(struct mac802154_llsec *sec,
const struct ieee802154_llsec_params *params,
int changed)
{
write_lock_bh(&sec->lock);
if (changed & IEEE802154_LLSEC_PARAM_ENABLED)
sec->params.enabled = params->enabled;
if (changed & IEEE802154_LLSEC_PARAM_FRAME_COUNTER)
sec->params.frame_counter = params->frame_counter;
if (changed & IEEE802154_LLSEC_PARAM_OUT_LEVEL)
sec->params.out_level = params->out_level;
if (changed & IEEE802154_LLSEC_PARAM_OUT_KEY)
sec->params.out_key = params->out_key;
if (changed & IEEE802154_LLSEC_PARAM_KEY_SOURCE)
sec->params.default_key_source = params->default_key_source;
if (changed & IEEE802154_LLSEC_PARAM_PAN_ID)
sec->params.pan_id = params->pan_id;
if (changed & IEEE802154_LLSEC_PARAM_HWADDR)
sec->params.hwaddr = params->hwaddr;
if (changed & IEEE802154_LLSEC_PARAM_COORD_HWADDR)
sec->params.coord_hwaddr = params->coord_hwaddr;
if (changed & IEEE802154_LLSEC_PARAM_COORD_SHORTADDR)
sec->params.coord_shortaddr = params->coord_shortaddr;
write_unlock_bh(&sec->lock);
return 0;
}
static struct mac802154_llsec_key*
llsec_key_alloc(const struct ieee802154_llsec_key *template)
{
const int authsizes[3] = { 4, 8, 16 };
struct mac802154_llsec_key *key;
int i;
key = kzalloc(sizeof(*key), GFP_KERNEL);
if (!key)
return NULL;
kref_init(&key->ref);
key->key = *template;
BUILD_BUG_ON(ARRAY_SIZE(authsizes) != ARRAY_SIZE(key->tfm));
for (i = 0; i < ARRAY_SIZE(key->tfm); i++) {
key->tfm[i] = crypto_alloc_aead("ccm(aes)", 0,
CRYPTO_ALG_ASYNC);
if (!key->tfm[i])
goto err_tfm;
if (crypto_aead_setkey(key->tfm[i], template->key,
IEEE802154_LLSEC_KEY_SIZE))
goto err_tfm;
if (crypto_aead_setauthsize(key->tfm[i], authsizes[i]))
goto err_tfm;
}
key->tfm0 = crypto_alloc_blkcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC);
if (!key->tfm0)
goto err_tfm;
if (crypto_blkcipher_setkey(key->tfm0, template->key,
IEEE802154_LLSEC_KEY_SIZE))
goto err_tfm0;
return key;
err_tfm0:
crypto_free_blkcipher(key->tfm0);
err_tfm:
for (i = 0; i < ARRAY_SIZE(key->tfm); i++)
if (key->tfm[i])
crypto_free_aead(key->tfm[i]);
kfree(key);
return NULL;
}
static void llsec_key_release(struct kref *ref)
{
struct mac802154_llsec_key *key;
int i;
key = container_of(ref, struct mac802154_llsec_key, ref);
for (i = 0; i < ARRAY_SIZE(key->tfm); i++)
crypto_free_aead(key->tfm[i]);
crypto_free_blkcipher(key->tfm0);
kfree(key);
}
static struct mac802154_llsec_key*
llsec_key_get(struct mac802154_llsec_key *key)
{
kref_get(&key->ref);
return key;
}
static void llsec_key_put(struct mac802154_llsec_key *key)
{
kref_put(&key->ref, llsec_key_release);
}
static bool llsec_key_id_equal(const struct ieee802154_llsec_key_id *a,
const struct ieee802154_llsec_key_id *b)
{
if (a->mode != b->mode)
return false;
if (a->mode == IEEE802154_SCF_KEY_IMPLICIT)
return ieee802154_addr_equal(&a->device_addr, &b->device_addr);
if (a->id != b->id)
return false;
switch (a->mode) {
case IEEE802154_SCF_KEY_SHORT_INDEX:
return a->short_source == b->short_source;
case IEEE802154_SCF_KEY_HW_INDEX:
return a->extended_source == b->extended_source;
}
return false;
}
int mac802154_llsec_key_add(struct mac802154_llsec *sec,
const struct ieee802154_llsec_key_id *id,
const struct ieee802154_llsec_key *key)
{
struct mac802154_llsec_key *mkey = NULL;
struct ieee802154_llsec_key_entry *pos, *new;
if (!(key->frame_types & (1 << IEEE802154_FC_TYPE_MAC_CMD)) &&
key->cmd_frame_ids)
return -EINVAL;
list_for_each_entry(pos, &sec->table.keys, list) {
if (llsec_key_id_equal(&pos->id, id))
return -EEXIST;
if (memcmp(pos->key->key, key->key,
IEEE802154_LLSEC_KEY_SIZE))
continue;
mkey = container_of(pos->key, struct mac802154_llsec_key, key);
/* Don't allow multiple instances of the same AES key to have
* different allowed frame types/command frame ids, as this is
* not possible in the 802.15.4 PIB.
*/
if (pos->key->frame_types != key->frame_types ||
pos->key->cmd_frame_ids != key->cmd_frame_ids)
return -EEXIST;
break;
}
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return -ENOMEM;
if (!mkey)
mkey = llsec_key_alloc(key);
else
mkey = llsec_key_get(mkey);
if (!mkey)
goto fail;
new->id = *id;
new->key = &mkey->key;
list_add_rcu(&new->list, &sec->table.keys);
return 0;
fail:
kfree(new);
return -ENOMEM;
}
int mac802154_llsec_key_del(struct mac802154_llsec *sec,
const struct ieee802154_llsec_key_id *key)
{
struct ieee802154_llsec_key_entry *pos;
list_for_each_entry(pos, &sec->table.keys, list) {
struct mac802154_llsec_key *mkey;
mkey = container_of(pos->key, struct mac802154_llsec_key, key);
if (llsec_key_id_equal(&pos->id, key)) {
llsec_key_put(mkey);
return 0;
}
}
return -ENOENT;
}
static bool llsec_dev_use_shortaddr(__le16 short_addr)
{
return short_addr != cpu_to_le16(IEEE802154_ADDR_UNDEF) &&
short_addr != cpu_to_le16(0xffff);
}
static u32 llsec_dev_hash_short(__le16 short_addr, __le16 pan_id)
{
return ((__force u16) short_addr) << 16 | (__force u16) pan_id;
}
static u64 llsec_dev_hash_long(__le64 hwaddr)
{
return (__force u64) hwaddr;
}
static struct mac802154_llsec_device*
llsec_dev_find_short(struct mac802154_llsec *sec, __le16 short_addr,
__le16 pan_id)
{
struct mac802154_llsec_device *dev;
u32 key = llsec_dev_hash_short(short_addr, pan_id);
hash_for_each_possible_rcu(sec->devices_short, dev, bucket_s, key) {
if (dev->dev.short_addr == short_addr &&
dev->dev.pan_id == pan_id)
return dev;
}
return NULL;
}
static struct mac802154_llsec_device*
llsec_dev_find_long(struct mac802154_llsec *sec, __le64 hwaddr)
{
struct mac802154_llsec_device *dev;
u64 key = llsec_dev_hash_long(hwaddr);
hash_for_each_possible_rcu(sec->devices_hw, dev, bucket_hw, key) {
if (dev->dev.hwaddr == hwaddr)
return dev;
}
return NULL;
}
static void llsec_dev_free(struct mac802154_llsec_device *dev)
{
struct ieee802154_llsec_device_key *pos, *pn;
struct mac802154_llsec_device_key *devkey;
list_for_each_entry_safe(pos, pn, &dev->dev.keys, list) {
devkey = container_of(pos, struct mac802154_llsec_device_key,
devkey);
list_del(&pos->list);
kfree(devkey);
}
kfree(dev);
}
int mac802154_llsec_dev_add(struct mac802154_llsec *sec,
const struct ieee802154_llsec_device *dev)
{
struct mac802154_llsec_device *entry;
u32 skey = llsec_dev_hash_short(dev->short_addr, dev->pan_id);
u64 hwkey = llsec_dev_hash_long(dev->hwaddr);
BUILD_BUG_ON(sizeof(hwkey) != IEEE802154_ADDR_LEN);
if ((llsec_dev_use_shortaddr(dev->short_addr) &&
llsec_dev_find_short(sec, dev->short_addr, dev->pan_id)) ||
llsec_dev_find_long(sec, dev->hwaddr))
return -EEXIST;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->dev = *dev;
spin_lock_init(&entry->lock);
INIT_LIST_HEAD(&entry->dev.keys);
if (llsec_dev_use_shortaddr(dev->short_addr))
hash_add_rcu(sec->devices_short, &entry->bucket_s, skey);
else
INIT_HLIST_NODE(&entry->bucket_s);
hash_add_rcu(sec->devices_hw, &entry->bucket_hw, hwkey);
list_add_tail_rcu(&entry->dev.list, &sec->table.devices);
return 0;
}
static void llsec_dev_free_rcu(struct rcu_head *rcu)
{
llsec_dev_free(container_of(rcu, struct mac802154_llsec_device, rcu));
}
int mac802154_llsec_dev_del(struct mac802154_llsec *sec, __le64 device_addr)
{
struct mac802154_llsec_device *pos;
pos = llsec_dev_find_long(sec, device_addr);
if (!pos)
return -ENOENT;
hash_del_rcu(&pos->bucket_s);
hash_del_rcu(&pos->bucket_hw);
call_rcu(&pos->rcu, llsec_dev_free_rcu);
return 0;
}
static struct mac802154_llsec_device_key*
llsec_devkey_find(struct mac802154_llsec_device *dev,
const struct ieee802154_llsec_key_id *key)
{
struct ieee802154_llsec_device_key *devkey;
list_for_each_entry_rcu(devkey, &dev->dev.keys, list) {
if (!llsec_key_id_equal(key, &devkey->key_id))
continue;
return container_of(devkey, struct mac802154_llsec_device_key,
devkey);
}
return NULL;
}
int mac802154_llsec_devkey_add(struct mac802154_llsec *sec,
__le64 dev_addr,
const struct ieee802154_llsec_device_key *key)
{
struct mac802154_llsec_device *dev;
struct mac802154_llsec_device_key *devkey;
dev = llsec_dev_find_long(sec, dev_addr);
if (!dev)
return -ENOENT;
if (llsec_devkey_find(dev, &key->key_id))
return -EEXIST;
devkey = kmalloc(sizeof(*devkey), GFP_KERNEL);
if (!devkey)
return -ENOMEM;
devkey->devkey = *key;
list_add_tail_rcu(&devkey->devkey.list, &dev->dev.keys);
return 0;
}
int mac802154_llsec_devkey_del(struct mac802154_llsec *sec,
__le64 dev_addr,
const struct ieee802154_llsec_device_key *key)
{
struct mac802154_llsec_device *dev;
struct mac802154_llsec_device_key *devkey;
dev = llsec_dev_find_long(sec, dev_addr);
if (!dev)
return -ENOENT;
devkey = llsec_devkey_find(dev, &key->key_id);
if (!devkey)
return -ENOENT;
list_del_rcu(&devkey->devkey.list);
kfree_rcu(devkey, rcu);
return 0;
}
static struct mac802154_llsec_seclevel*
llsec_find_seclevel(const struct mac802154_llsec *sec,
const struct ieee802154_llsec_seclevel *sl)
{
struct ieee802154_llsec_seclevel *pos;
list_for_each_entry(pos, &sec->table.security_levels, list) {
if (pos->frame_type != sl->frame_type ||
(pos->frame_type == IEEE802154_FC_TYPE_MAC_CMD &&
pos->cmd_frame_id != sl->cmd_frame_id) ||
pos->device_override != sl->device_override ||
pos->sec_levels != sl->sec_levels)
continue;
return container_of(pos, struct mac802154_llsec_seclevel,
level);
}
return NULL;
}
int mac802154_llsec_seclevel_add(struct mac802154_llsec *sec,
const struct ieee802154_llsec_seclevel *sl)
{
struct mac802154_llsec_seclevel *entry;
if (llsec_find_seclevel(sec, sl))
return -EEXIST;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->level = *sl;
list_add_tail_rcu(&entry->level.list, &sec->table.security_levels);
return 0;
}
int mac802154_llsec_seclevel_del(struct mac802154_llsec *sec,
const struct ieee802154_llsec_seclevel *sl)
{
struct mac802154_llsec_seclevel *pos;
pos = llsec_find_seclevel(sec, sl);
if (!pos)
return -ENOENT;
list_del_rcu(&pos->level.list);
kfree_rcu(pos, rcu);
return 0;
}
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