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netlabel_unlabeled.c
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/*
* NetLabel Unlabeled Support
*
* This file defines functions for dealing with unlabeled packets for the
* NetLabel system. The NetLabel system manages static and dynamic label
* mappings for network protocols such as CIPSO and RIPSO.
*
* Author: Paul Moore <[email protected]>
*
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/net_namespace.h>
#include <net/netlabel.h>
#include <asm/bug.h>
#include <linux/atomic.h>
#include "netlabel_user.h"
#include "netlabel_addrlist.h"
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_mgmt.h"
/* NOTE: at present we always use init's network namespace since we don't
* presently support different namespaces even though the majority of
* the functions in this file are "namespace safe" */
/* The unlabeled connection hash table which we use to map network interfaces
* and addresses of unlabeled packets to a user specified secid value for the
* LSM. The hash table is used to lookup the network interface entry
* (struct netlbl_unlhsh_iface) and then the interface entry is used to
* lookup an IP address match from an ordered list. If a network interface
* match can not be found in the hash table then the default entry
* (netlbl_unlhsh_def) is used. The IP address entry list
* (struct netlbl_unlhsh_addr) is ordered such that the entries with a
* larger netmask come first.
*/
struct netlbl_unlhsh_tbl {
struct list_head *tbl;
u32 size;
};
#define netlbl_unlhsh_addr4_entry(iter) \
container_of(iter, struct netlbl_unlhsh_addr4, list)
struct netlbl_unlhsh_addr4 {
u32 secid;
struct netlbl_af4list list;
struct rcu_head rcu;
};
#define netlbl_unlhsh_addr6_entry(iter) \
container_of(iter, struct netlbl_unlhsh_addr6, list)
struct netlbl_unlhsh_addr6 {
u32 secid;
struct netlbl_af6list list;
struct rcu_head rcu;
};
struct netlbl_unlhsh_iface {
int ifindex;
struct list_head addr4_list;
struct list_head addr6_list;
u32 valid;
struct list_head list;
struct rcu_head rcu;
};
/* Argument struct for netlbl_unlhsh_walk() */
struct netlbl_unlhsh_walk_arg {
struct netlink_callback *nl_cb;
struct sk_buff *skb;
u32 seq;
};
/* Unlabeled connection hash table */
/* updates should be so rare that having one spinlock for the entire
* hash table should be okay */
static DEFINE_SPINLOCK(netlbl_unlhsh_lock);
#define netlbl_unlhsh_rcu_deref(p) \
rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock))
static struct netlbl_unlhsh_tbl *netlbl_unlhsh = NULL;
static struct netlbl_unlhsh_iface *netlbl_unlhsh_def = NULL;
/* Accept unlabeled packets flag */
static u8 netlabel_unlabel_acceptflg = 0;
/* NetLabel Generic NETLINK unlabeled family */
static struct genl_family netlbl_unlabel_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_UNLABELED_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = NLBL_UNLABEL_A_MAX,
};
/* NetLabel Netlink attribute policy */
static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
[NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
[NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY,
.len = sizeof(struct in6_addr) },
[NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY,
.len = sizeof(struct in6_addr) },
[NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY,
.len = sizeof(struct in_addr) },
[NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY,
.len = sizeof(struct in_addr) },
[NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING,
.len = IFNAMSIZ - 1 },
[NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY }
};
/*
* Unlabeled Connection Hash Table Functions
*/
/**
* netlbl_unlhsh_free_iface - Frees an interface entry from the hash table
* @entry: the entry's RCU field
*
* Description:
* This function is designed to be used as a callback to the call_rcu()
* function so that memory allocated to a hash table interface entry can be
* released safely. It is important to note that this function does not free
* the IPv4 and IPv6 address lists contained as part of an interface entry. It
* is up to the rest of the code to make sure an interface entry is only freed
* once it's address lists are empty.
*
*/
static void netlbl_unlhsh_free_iface(struct rcu_head *entry)
{
struct netlbl_unlhsh_iface *iface;
struct netlbl_af4list *iter4;
struct netlbl_af4list *tmp4;
#if IS_ENABLED(CONFIG_IPV6)
struct netlbl_af6list *iter6;
struct netlbl_af6list *tmp6;
#endif /* IPv6 */
iface = container_of(entry, struct netlbl_unlhsh_iface, rcu);
/* no need for locks here since we are the only one with access to this
* structure */
netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) {
netlbl_af4list_remove_entry(iter4);
kfree(netlbl_unlhsh_addr4_entry(iter4));
}
#if IS_ENABLED(CONFIG_IPV6)
netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) {
netlbl_af6list_remove_entry(iter6);
kfree(netlbl_unlhsh_addr6_entry(iter6));
}
#endif /* IPv6 */
kfree(iface);
}
/**
* netlbl_unlhsh_hash - Hashing function for the hash table
* @ifindex: the network interface/device to hash
*
* Description:
* This is the hashing function for the unlabeled hash table, it returns the
* bucket number for the given device/interface. The caller is responsible for
* ensuring that the hash table is protected with either a RCU read lock or
* the hash table lock.
*
*/
static u32 netlbl_unlhsh_hash(int ifindex)
{
return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1);
}
/**
* netlbl_unlhsh_search_iface - Search for a matching interface entry
* @ifindex: the network interface
*
* Description:
* Searches the unlabeled connection hash table and returns a pointer to the
* interface entry which matches @ifindex, otherwise NULL is returned. The
* caller is responsible for ensuring that the hash table is protected with
* either a RCU read lock or the hash table lock.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
{
u32 bkt;
struct list_head *bkt_list;
struct netlbl_unlhsh_iface *iter;
bkt = netlbl_unlhsh_hash(ifindex);
bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt];
list_for_each_entry_rcu(iter, bkt_list, list)
if (iter->valid && iter->ifindex == ifindex)
return iter;
return NULL;
}
/**
* netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table
* @iface: the associated interface entry
* @addr: IPv4 address in network byte order
* @mask: IPv4 address mask in network byte order
* @secid: LSM secid value for entry
*
* Description:
* Add a new address entry into the unlabeled connection hash table using the
* interface entry specified by @iface. On success zero is returned, otherwise
* a negative value is returned.
*
*/
static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
const struct in_addr *addr,
const struct in_addr *mask,
u32 secid)
{
int ret_val;
struct netlbl_unlhsh_addr4 *entry;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
return -ENOMEM;
entry->list.addr = addr->s_addr & mask->s_addr;
entry->list.mask = mask->s_addr;
entry->list.valid = 1;
entry->secid = secid;
spin_lock(&netlbl_unlhsh_lock);
ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list);
spin_unlock(&netlbl_unlhsh_lock);
if (ret_val != 0)
kfree(entry);
return ret_val;
}
#if IS_ENABLED(CONFIG_IPV6)
/**
* netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table
* @iface: the associated interface entry
* @addr: IPv6 address in network byte order
* @mask: IPv6 address mask in network byte order
* @secid: LSM secid value for entry
*
* Description:
* Add a new address entry into the unlabeled connection hash table using the
* interface entry specified by @iface. On success zero is returned, otherwise
* a negative value is returned.
*
*/
static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
const struct in6_addr *addr,
const struct in6_addr *mask,
u32 secid)
{
int ret_val;
struct netlbl_unlhsh_addr6 *entry;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
return -ENOMEM;
entry->list.addr = *addr;
entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
entry->list.mask = *mask;
entry->list.valid = 1;
entry->secid = secid;
spin_lock(&netlbl_unlhsh_lock);
ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list);
spin_unlock(&netlbl_unlhsh_lock);
if (ret_val != 0)
kfree(entry);
return 0;
}
#endif /* IPv6 */
/**
* netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table
* @ifindex: network interface
*
* Description:
* Add a new, empty, interface entry into the unlabeled connection hash table.
* On success a pointer to the new interface entry is returned, on failure NULL
* is returned.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex)
{
u32 bkt;
struct netlbl_unlhsh_iface *iface;
iface = kzalloc(sizeof(*iface), GFP_ATOMIC);
if (iface == NULL)
return NULL;
iface->ifindex = ifindex;
INIT_LIST_HEAD(&iface->addr4_list);
INIT_LIST_HEAD(&iface->addr6_list);
iface->valid = 1;
spin_lock(&netlbl_unlhsh_lock);
if (ifindex > 0) {
bkt = netlbl_unlhsh_hash(ifindex);
if (netlbl_unlhsh_search_iface(ifindex) != NULL)
goto add_iface_failure;
list_add_tail_rcu(&iface->list,
&netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]);
} else {
INIT_LIST_HEAD(&iface->list);
if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL)
goto add_iface_failure;
rcu_assign_pointer(netlbl_unlhsh_def, iface);
}
spin_unlock(&netlbl_unlhsh_lock);
return iface;
add_iface_failure:
spin_unlock(&netlbl_unlhsh_lock);
kfree(iface);
return NULL;
}
/**
* netlbl_unlhsh_add - Adds a new entry to the unlabeled connection hash table
* @net: network namespace
* @dev_name: interface name
* @addr: IP address in network byte order
* @mask: address mask in network byte order
* @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
* @secid: LSM secid value for the entry
* @audit_info: NetLabel audit information
*
* Description:
* Adds a new entry to the unlabeled connection hash table. Returns zero on
* success, negative values on failure.
*
*/
int netlbl_unlhsh_add(struct net *net,
const char *dev_name,
const void *addr,
const void *mask,
u32 addr_len,
u32 secid,
struct netlbl_audit *audit_info)
{
int ret_val;
int ifindex;
struct net_device *dev;
struct netlbl_unlhsh_iface *iface;
struct audit_buffer *audit_buf = NULL;
char *secctx = NULL;
u32 secctx_len;
if (addr_len != sizeof(struct in_addr) &&
addr_len != sizeof(struct in6_addr))
return -EINVAL;
rcu_read_lock();
if (dev_name != NULL) {
dev = dev_get_by_name_rcu(net, dev_name);
if (dev == NULL) {
ret_val = -ENODEV;
goto unlhsh_add_return;
}
ifindex = dev->ifindex;
iface = netlbl_unlhsh_search_iface(ifindex);
} else {
ifindex = 0;
iface = rcu_dereference(netlbl_unlhsh_def);
}
if (iface == NULL) {
iface = netlbl_unlhsh_add_iface(ifindex);
if (iface == NULL) {
ret_val = -ENOMEM;
goto unlhsh_add_return;
}
}
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCADD,
audit_info);
switch (addr_len) {
case sizeof(struct in_addr): {
const struct in_addr *addr4 = addr;
const struct in_addr *mask4 = mask;
ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
if (audit_buf != NULL)
netlbl_af4list_audit_addr(audit_buf, 1,
dev_name,
addr4->s_addr,
mask4->s_addr);
break;
}
#if IS_ENABLED(CONFIG_IPV6)
case sizeof(struct in6_addr): {
const struct in6_addr *addr6 = addr;
const struct in6_addr *mask6 = mask;
ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
if (audit_buf != NULL)
netlbl_af6list_audit_addr(audit_buf, 1,
dev_name,
addr6, mask6);
break;
}
#endif /* IPv6 */
default:
ret_val = -EINVAL;
}
if (ret_val == 0)
atomic_inc(&netlabel_mgmt_protocount);
unlhsh_add_return:
rcu_read_unlock();
if (audit_buf != NULL) {
if (security_secid_to_secctx(secid,
&secctx,
&secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
security_release_secctx(secctx, secctx_len);
}
audit_log_format(audit_buf, " res=%u", ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
return ret_val;
}
/**
* netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry
* @net: network namespace
* @iface: interface entry
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Remove an IP address entry from the unlabeled connection hash table.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlhsh_remove_addr4(struct net *net,
struct netlbl_unlhsh_iface *iface,
const struct in_addr *addr,
const struct in_addr *mask,
struct netlbl_audit *audit_info)
{
struct netlbl_af4list *list_entry;
struct netlbl_unlhsh_addr4 *entry;
struct audit_buffer *audit_buf;
struct net_device *dev;
char *secctx;
u32 secctx_len;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
&iface->addr4_list);
spin_unlock(&netlbl_unlhsh_lock);
if (list_entry != NULL)
entry = netlbl_unlhsh_addr4_entry(list_entry);
else
entry = NULL;
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
audit_info);
if (audit_buf != NULL) {
dev = dev_get_by_index(net, iface->ifindex);
netlbl_af4list_audit_addr(audit_buf, 1,
(dev != NULL ? dev->name : NULL),
addr->s_addr, mask->s_addr);
if (dev != NULL)
dev_put(dev);
if (entry != NULL &&
security_secid_to_secctx(entry->secid,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
security_release_secctx(secctx, secctx_len);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
audit_log_end(audit_buf);
}
if (entry == NULL)
return -ENOENT;
kfree_rcu(entry, rcu);
return 0;
}
#if IS_ENABLED(CONFIG_IPV6)
/**
* netlbl_unlhsh_remove_addr6 - Remove an IPv6 address entry
* @net: network namespace
* @iface: interface entry
* @addr: IP address
* @mask: IP address mask
* @audit_info: NetLabel audit information
*
* Description:
* Remove an IP address entry from the unlabeled connection hash table.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlhsh_remove_addr6(struct net *net,
struct netlbl_unlhsh_iface *iface,
const struct in6_addr *addr,
const struct in6_addr *mask,
struct netlbl_audit *audit_info)
{
struct netlbl_af6list *list_entry;
struct netlbl_unlhsh_addr6 *entry;
struct audit_buffer *audit_buf;
struct net_device *dev;
char *secctx;
u32 secctx_len;
spin_lock(&netlbl_unlhsh_lock);
list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
spin_unlock(&netlbl_unlhsh_lock);
if (list_entry != NULL)
entry = netlbl_unlhsh_addr6_entry(list_entry);
else
entry = NULL;
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
audit_info);
if (audit_buf != NULL) {
dev = dev_get_by_index(net, iface->ifindex);
netlbl_af6list_audit_addr(audit_buf, 1,
(dev != NULL ? dev->name : NULL),
addr, mask);
if (dev != NULL)
dev_put(dev);
if (entry != NULL &&
security_secid_to_secctx(entry->secid,
&secctx, &secctx_len) == 0) {
audit_log_format(audit_buf, " sec_obj=%s", secctx);
security_release_secctx(secctx, secctx_len);
}
audit_log_format(audit_buf, " res=%u", entry != NULL ? 1 : 0);
audit_log_end(audit_buf);
}
if (entry == NULL)
return -ENOENT;
kfree_rcu(entry, rcu);
return 0;
}
#endif /* IPv6 */
/**
* netlbl_unlhsh_condremove_iface - Remove an interface entry
* @iface: the interface entry
*
* Description:
* Remove an interface entry from the unlabeled connection hash table if it is
* empty. An interface entry is considered to be empty if there are no
* address entries assigned to it.
*
*/
static void netlbl_unlhsh_condremove_iface(struct netlbl_unlhsh_iface *iface)
{
struct netlbl_af4list *iter4;
#if IS_ENABLED(CONFIG_IPV6)
struct netlbl_af6list *iter6;
#endif /* IPv6 */
spin_lock(&netlbl_unlhsh_lock);
netlbl_af4list_foreach_rcu(iter4, &iface->addr4_list)
goto unlhsh_condremove_failure;
#if IS_ENABLED(CONFIG_IPV6)
netlbl_af6list_foreach_rcu(iter6, &iface->addr6_list)
goto unlhsh_condremove_failure;
#endif /* IPv6 */
iface->valid = 0;
if (iface->ifindex > 0)
list_del_rcu(&iface->list);
else
RCU_INIT_POINTER(netlbl_unlhsh_def, NULL);
spin_unlock(&netlbl_unlhsh_lock);
call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
return;
unlhsh_condremove_failure:
spin_unlock(&netlbl_unlhsh_lock);
}
/**
* netlbl_unlhsh_remove - Remove an entry from the unlabeled hash table
* @net: network namespace
* @dev_name: interface name
* @addr: IP address in network byte order
* @mask: address mask in network byte order
* @addr_len: length of address/mask (4 for IPv4, 16 for IPv6)
* @audit_info: NetLabel audit information
*
* Description:
* Removes and existing entry from the unlabeled connection hash table.
* Returns zero on success, negative values on failure.
*
*/
int netlbl_unlhsh_remove(struct net *net,
const char *dev_name,
const void *addr,
const void *mask,
u32 addr_len,
struct netlbl_audit *audit_info)
{
int ret_val;
struct net_device *dev;
struct netlbl_unlhsh_iface *iface;
if (addr_len != sizeof(struct in_addr) &&
addr_len != sizeof(struct in6_addr))
return -EINVAL;
rcu_read_lock();
if (dev_name != NULL) {
dev = dev_get_by_name_rcu(net, dev_name);
if (dev == NULL) {
ret_val = -ENODEV;
goto unlhsh_remove_return;
}
iface = netlbl_unlhsh_search_iface(dev->ifindex);
} else
iface = rcu_dereference(netlbl_unlhsh_def);
if (iface == NULL) {
ret_val = -ENOENT;
goto unlhsh_remove_return;
}
switch (addr_len) {
case sizeof(struct in_addr):
ret_val = netlbl_unlhsh_remove_addr4(net,
iface, addr, mask,
audit_info);
break;
#if IS_ENABLED(CONFIG_IPV6)
case sizeof(struct in6_addr):
ret_val = netlbl_unlhsh_remove_addr6(net,
iface, addr, mask,
audit_info);
break;
#endif /* IPv6 */
default:
ret_val = -EINVAL;
}
if (ret_val == 0) {
netlbl_unlhsh_condremove_iface(iface);
atomic_dec(&netlabel_mgmt_protocount);
}
unlhsh_remove_return:
rcu_read_unlock();
return ret_val;
}
/*
* General Helper Functions
*/
/**
* netlbl_unlhsh_netdev_handler - Network device notification handler
* @this: notifier block
* @event: the event
* @ptr: the network device (cast to void)
*
* Description:
* Handle network device events, although at present all we care about is a
* network device going away. In the case of a device going away we clear any
* related entries from the unlabeled connection hash table.
*
*/
static int netlbl_unlhsh_netdev_handler(struct notifier_block *this,
unsigned long event,
void *ptr)
{
struct net_device *dev = ptr;
struct netlbl_unlhsh_iface *iface = NULL;
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
/* XXX - should this be a check for NETDEV_DOWN or _UNREGISTER? */
if (event == NETDEV_DOWN) {
spin_lock(&netlbl_unlhsh_lock);
iface = netlbl_unlhsh_search_iface(dev->ifindex);
if (iface != NULL && iface->valid) {
iface->valid = 0;
list_del_rcu(&iface->list);
} else
iface = NULL;
spin_unlock(&netlbl_unlhsh_lock);
}
if (iface != NULL)
call_rcu(&iface->rcu, netlbl_unlhsh_free_iface);
return NOTIFY_DONE;
}
/**
* netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
* @value: desired value
* @audit_info: NetLabel audit information
*
* Description:
* Set the value of the unlabeled accept flag to @value.
*
*/
static void netlbl_unlabel_acceptflg_set(u8 value,
struct netlbl_audit *audit_info)
{
struct audit_buffer *audit_buf;
u8 old_val;
old_val = netlabel_unlabel_acceptflg;
netlabel_unlabel_acceptflg = value;
audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
audit_info);
if (audit_buf != NULL) {
audit_log_format(audit_buf,
" unlbl_accept=%u old=%u", value, old_val);
audit_log_end(audit_buf);
}
}
/**
* netlbl_unlabel_addrinfo_get - Get the IPv4/6 address information
* @info: the Generic NETLINK info block
* @addr: the IP address
* @mask: the IP address mask
* @len: the address length
*
* Description:
* Examine the Generic NETLINK message and extract the IP address information.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlabel_addrinfo_get(struct genl_info *info,
void **addr,
void **mask,
u32 *len)
{
u32 addr_len;
if (info->attrs[NLBL_UNLABEL_A_IPV4ADDR]) {
addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
if (addr_len != sizeof(struct in_addr) &&
addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV4MASK]))
return -EINVAL;
*len = addr_len;
*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4ADDR]);
*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV4MASK]);
return 0;
} else if (info->attrs[NLBL_UNLABEL_A_IPV6ADDR]) {
addr_len = nla_len(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
if (addr_len != sizeof(struct in6_addr) &&
addr_len != nla_len(info->attrs[NLBL_UNLABEL_A_IPV6MASK]))
return -EINVAL;
*len = addr_len;
*addr = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6ADDR]);
*mask = nla_data(info->attrs[NLBL_UNLABEL_A_IPV6MASK]);
return 0;
}
return -EINVAL;
}
/*
* NetLabel Command Handlers
*/
/**
* netlbl_unlabel_accept - Handle an ACCEPT message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated ACCEPT message and set the accept flag accordingly.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
{
u8 value;
struct netlbl_audit audit_info;
if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
if (value == 1 || value == 0) {
netlbl_netlink_auditinfo(skb, &audit_info);
netlbl_unlabel_acceptflg_set(value, &audit_info);
return 0;
}
}
return -EINVAL;
}
/**
* netlbl_unlabel_list - Handle a LIST message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LIST message and respond with the current status.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct sk_buff *ans_skb;
void *data;
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (ans_skb == NULL)
goto list_failure;
data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
0, NLBL_UNLABEL_C_LIST);
if (data == NULL) {
ret_val = -ENOMEM;
goto list_failure;
}
ret_val = nla_put_u8(ans_skb,
NLBL_UNLABEL_A_ACPTFLG,
netlabel_unlabel_acceptflg);
if (ret_val != 0)
goto list_failure;
genlmsg_end(ans_skb, data);
return genlmsg_reply(ans_skb, info);
list_failure:
kfree_skb(ans_skb);
return ret_val;
}
/**
* netlbl_unlabel_staticadd - Handle a STATICADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated STATICADD message and add a new unlabeled
* connection entry to the hash table. Returns zero on success, negative
* values on failure.
*
*/
static int netlbl_unlabel_staticadd(struct sk_buff *skb,
struct genl_info *info)
{
int ret_val;
char *dev_name;
void *addr;
void *mask;
u32 addr_len;
u32 secid;
struct netlbl_audit audit_info;
/* Don't allow users to add both IPv4 and IPv6 addresses for a
* single entry. However, allow users to create two entries, one each
* for IPv4 and IPv4, with the same LSM security context which should
* achieve the same result. */
if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
!info->attrs[NLBL_UNLABEL_A_IFACE] ||
!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
!info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
(!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
!info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
return -EINVAL;
netlbl_netlink_auditinfo(skb, &audit_info);
ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
if (ret_val != 0)
return ret_val;
dev_name = nla_data(info->attrs[NLBL_UNLABEL_A_IFACE]);
ret_val = security_secctx_to_secid(
nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
&secid);
if (ret_val != 0)
return ret_val;
return netlbl_unlhsh_add(&init_net,
dev_name, addr, mask, addr_len, secid,
&audit_info);
}
/**
* netlbl_unlabel_staticadddef - Handle a STATICADDDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated STATICADDDEF message and add a new default
* unlabeled connection entry. Returns zero on success, negative values on
* failure.
*
*/
static int netlbl_unlabel_staticadddef(struct sk_buff *skb,
struct genl_info *info)
{
int ret_val;
void *addr;
void *mask;
u32 addr_len;
u32 secid;
struct netlbl_audit audit_info;
/* Don't allow users to add both IPv4 and IPv6 addresses for a
* single entry. However, allow users to create two entries, one each
* for IPv4 and IPv6, with the same LSM security context which should
* achieve the same result. */
if (!info->attrs[NLBL_UNLABEL_A_SECCTX] ||
!((!info->attrs[NLBL_UNLABEL_A_IPV4ADDR] ||
!info->attrs[NLBL_UNLABEL_A_IPV4MASK]) ^
(!info->attrs[NLBL_UNLABEL_A_IPV6ADDR] ||
!info->attrs[NLBL_UNLABEL_A_IPV6MASK])))
return -EINVAL;
netlbl_netlink_auditinfo(skb, &audit_info);
ret_val = netlbl_unlabel_addrinfo_get(info, &addr, &mask, &addr_len);
if (ret_val != 0)
return ret_val;
ret_val = security_secctx_to_secid(
nla_data(info->attrs[NLBL_UNLABEL_A_SECCTX]),
nla_len(info->attrs[NLBL_UNLABEL_A_SECCTX]),
&secid);
if (ret_val != 0)
return ret_val;
return netlbl_unlhsh_add(&init_net,
NULL, addr, mask, addr_len, secid,
&audit_info);
}
/**
* netlbl_unlabel_staticremove - Handle a STATICREMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated STATICREMOVE message and remove the specified
* unlabeled connection entry. Returns zero on success, negative values on
* failure.
*
*/
static int netlbl_unlabel_staticremove(struct sk_buff *skb,
struct genl_info *info)
{