/*
* 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 <paul.moore@hp.com>
*
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2007
*
* 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 <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 <asm/atomic.h>
#include "netlabel_user.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;
};
struct netlbl_unlhsh_addr4 {
__be32 addr;
__be32 mask;
u32 secid;
u32 valid;
struct list_head list;
struct rcu_head rcu;
};
struct netlbl_unlhsh_addr6 {
struct in6_addr addr;
struct in6_addr mask;
u32 secid;
u32 valid;
struct list_head 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);
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 }
};
/*
* Audit Helper Functions
*/
/**
* netlbl_unlabel_audit_addr4 - Audit an IPv4 address
* @audit_buf: audit buffer
* @dev: network interface
* @addr: IP address
* @mask: IP address mask
*
* Description:
* Write the IPv4 address and address mask, if necessary, to @audit_buf.
*
*/
static void netlbl_unlabel_audit_addr4(struct audit_buffer *audit_buf,
const char *dev,
__be32 addr, __be32 mask)
{
u32 mask_val = ntohl(mask);
if (dev != NULL)
audit_log_format(audit_buf, " netif=%s", dev);
audit_log_format(audit_buf, " src=" NIPQUAD_FMT, NIPQUAD(addr));
if (mask_val != 0xffffffff) {
u32 mask_len = 0;
while (mask_val > 0) {
mask_val <<= 1;
mask_len++;
}
audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
}
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
* netlbl_unlabel_audit_addr6 - Audit an IPv6 address
* @audit_buf: audit buffer
* @dev: network interface
* @addr: IP address
* @mask: IP address mask
*
* Description:
* Write the IPv6 address and address mask, if necessary, to @audit_buf.
*
*/
static void netlbl_unlabel_audit_addr6(struct audit_buffer *audit_buf,
const char *dev,
const struct in6_addr *addr,
const struct in6_addr *mask)
{
if (dev != NULL)
audit_log_format(audit_buf, " netif=%s", dev);
audit_log_format(audit_buf, " src=" NIP6_FMT, NIP6(*addr));
if (ntohl(mask->s6_addr32[3]) != 0xffffffff) {
u32 mask_len = 0;
u32 mask_val;
int iter = -1;
while (ntohl(mask->s6_addr32[++iter]) == 0xffffffff)
mask_len += 32;
mask_val = ntohl(mask->s6_addr32[iter]);
while (mask_val > 0) {
mask_val <<= 1;
mask_len++;
}
audit_log_format(audit_buf, " src_prefixlen=%d", mask_len);
}
}
#endif /* IPv6 */
/*
* Unlabeled Connection Hash Table Functions
*/
/**
* netlbl_unlhsh_free_addr4 - Frees an IPv4 address 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 address entry can be
* released safely.
*
*/
static void netlbl_unlhsh_free_addr4(struct rcu_head *entry)
{
struct netlbl_unlhsh_addr4 *ptr;
ptr = container_of(entry, struct netlbl_unlhsh_addr4, rcu);
kfree(ptr);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
* netlbl_unlhsh_free_addr6 - Frees an IPv6 address 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 address entry can be
* released safely.
*
*/
static void netlbl_unlhsh_free_addr6(struct rcu_head *entry)
{
struct netlbl_unlhsh_addr6 *ptr;
ptr = container_of(entry, struct netlbl_unlhsh_addr6, rcu);
kfree(ptr);
}
#endif /* IPv6 */
/**
* 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_unlhsh_addr4 *iter4;
struct netlbl_unlhsh_addr4 *tmp4;
struct netlbl_unlhsh_addr6 *iter6;
struct netlbl_unlhsh_addr6 *tmp6;
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 */
list_for_each_entry_safe(iter4, tmp4, &iface->addr4_list, list)
if (iter4->valid) {
list_del_rcu(&iter4->list);
kfree(iter4);
}
list_for_each_entry_safe(iter6, tmp6, &iface->addr6_list, list)
if (iter6->valid) {
list_del_rcu(&iter6->list);
kfree(iter6);
}
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
* calling the rcu_read_[un]lock() functions.
*
*/
static u32 netlbl_unlhsh_hash(int ifindex)
{
/* this is taken _almost_ directly from
* security/selinux/netif.c:sel_netif_hasfn() as they do pretty much
* the same thing */
return ifindex & (rcu_dereference(netlbl_unlhsh)->size - 1);
}
/**
* netlbl_unlhsh_search_addr4 - Search for a matching IPv4 address entry
* @addr: IPv4 address
* @iface: the network interface entry
*
* Description:
* Searches the IPv4 address list of the network interface specified by @iface.
* If a matching address entry is found it is returned, otherwise NULL is
* returned. The caller is responsible for calling the rcu_read_[un]lock()
* functions.
*
*/
static struct netlbl_unlhsh_addr4 *netlbl_unlhsh_search_addr4(
__be32 addr,
const struct netlbl_unlhsh_iface *iface)
{
struct netlbl_unlhsh_addr4 *iter;
list_for_each_entry_rcu(iter, &iface->addr4_list, list)
if (iter->valid && (addr & iter->mask) == iter->addr)
return iter;
return NULL;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
* netlbl_unlhsh_search_addr6 - Search for a matching IPv6 address entry
* @addr: IPv6 address
* @iface: the network interface entry
*
* Description:
* Searches the IPv6 address list of the network interface specified by @iface.
* If a matching address entry is found it is returned, otherwise NULL is
* returned. The caller is responsible for calling the rcu_read_[un]lock()
* functions.
*
*/
static struct netlbl_unlhsh_addr6 *netlbl_unlhsh_search_addr6(
const struct in6_addr *addr,
const struct netlbl_unlhsh_iface *iface)
{
struct netlbl_unlhsh_addr6 *iter;
list_for_each_entry_rcu(iter, &iface->addr6_list, list)
if (iter->valid &&
ipv6_masked_addr_cmp(&iter->addr, &iter->mask, addr) == 0)
return iter;
return NULL;
}
#endif /* IPv6 */
/**
* 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 calling the rcu_read_[un]lock() functions.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex)
{
u32 bkt;
struct netlbl_unlhsh_iface *iter;
bkt = netlbl_unlhsh_hash(ifindex);
list_for_each_entry_rcu(iter,
&rcu_dereference(netlbl_unlhsh)->tbl[bkt],
list)
if (iter->valid && iter->ifindex == ifindex)
return iter;
return NULL;
}
/**
* netlbl_unlhsh_search_iface_def - 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. If an exact match can not be found
* and there is a valid default entry, the default entry is returned, otherwise
* NULL is returned. The caller is responsible for calling the
* rcu_read_[un]lock() functions.
*
*/
static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface_def(int ifindex)
{
struct netlbl_unlhsh_iface *entry;
entry = netlbl_unlhsh_search_iface(ifindex);
if (entry != NULL)
return entry;
entry = rcu_dereference(netlbl_unlhsh_def);
if (entry != NULL && entry->valid)
return entry;
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. The caller is responsible for calling the
* rcu_read_[un]lock() functions.
*
*/
static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface,
const struct in_addr *addr,
const struct in_addr *mask,
u32 secid)
{
struct netlbl_unlhsh_addr4 *entry;
struct netlbl_unlhsh_addr4 *iter;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
return -ENOMEM;
entry->addr = addr->s_addr & mask->s_addr;
entry->mask = mask->s_addr;
entry->secid = secid;
entry->valid = 1;
INIT_RCU_HEAD(&entry->rcu);
spin_lock(&netlbl_unlhsh_lock);
iter = netlbl_unlhsh_search_addr4(entry->addr, iface);
if (iter != NULL &&
iter->addr == addr->s_addr && iter->mask == mask->s_addr) {
spin_unlock(&netlbl_unlhsh_lock);
kfree(entry);
return -EEXIST;
}
/* in order to speed up address searches through the list (the common
* case) we need to keep the list in order based on the size of the
* address mask such that the entry with the widest mask (smallest
* numerical value) appears first in the list */
list_for_each_entry_rcu(iter, &iface->addr4_list, list)
if (iter->valid &&
ntohl(entry->mask) > ntohl(iter->mask)) {
__list_add_rcu(&entry->list,
iter->list.prev,
&iter->list);
spin_unlock(&netlbl_unlhsh_lock);
return 0;
}
list_add_tail_rcu(&entry->list, &iface->addr4_list);
spin_unlock(&netlbl_unlhsh_lock);
return 0;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
* 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. The caller is responsible for calling the
* rcu_read_[un]lock() functions.
*
*/
static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface,
const struct in6_addr *addr,
const struct in6_addr *mask,
u32 secid)
{
struct netlbl_unlhsh_addr6 *entry;
struct netlbl_unlhsh_addr6 *iter;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (entry == NULL)
return -ENOMEM;
ipv6_addr_copy(&entry->addr, addr);
entry->addr.s6_addr32[0] &= mask->s6_addr32[0];
entry->addr.s6_addr32[1] &= mask->s6_addr32[1];
entry->addr.s6_addr32[2] &= mask->s6_addr32[2];
entry->addr.s6_addr32[3] &= mask->s6_addr32[3];
ipv6_addr_copy(&entry->mask, mask);
entry->secid = secid;
entry->valid = 1;
INIT_RCU_HEAD(&entry->rcu);
spin_lock(&netlbl_unlhsh_lock);
iter = netlbl_unlhsh_search_addr6(&entry->addr, iface);
if (iter != NULL &&
(ipv6_addr_equal(&iter->addr, addr) &&
ipv6_addr_equal(&iter->mask, mask))) {
spin_unlock(&netlbl_unlhsh_lock);
kfree(entry);
return -EEXIST;
}
/* in order to speed up address searches through the list (the common
* case) we need to keep the list in order based on the size of the
* address mask such that the entry with the widest mask (smallest
* numerical value) appears first in the list */
list_for_each_entry_rcu(iter, &iface->addr6_list, list)
if (iter->valid &&
ipv6_addr_cmp(&entry->mask, &iter->mask) > 0) {
__list_add_rcu(&entry->list,
iter->list.prev,
&iter->list);
spin_unlock(&netlbl_unlhsh_lock);
return 0;
}
list_add_tail_rcu(&entry->list, &iface->addr6_list);
spin_unlock(&netlbl_unlhsh_lock);
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. The caller is responsible for calling the rcu_read_[un]lock()
* functions.
*
*/
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;
INIT_RCU_HEAD(&iface->rcu);
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,
&rcu_dereference(netlbl_unlhsh)->tbl[bkt]);
} else {
INIT_LIST_HEAD(&iface->list);
if (rcu_dereference(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.
*
*/
static 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(net, dev_name);
if (dev == NULL) {
ret_val = -ENODEV;
goto unlhsh_add_return;
}
ifindex = dev->ifindex;
dev_put(dev);
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): {
struct in_addr *addr4, *mask4;
addr4 = (struct in_addr *)addr;
mask4 = (struct in_addr *)mask;
ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid);
if (audit_buf != NULL)
netlbl_unlabel_audit_addr4(audit_buf,
dev_name,
addr4->s_addr,
mask4->s_addr);
break;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case sizeof(struct in6_addr): {
struct in6_addr *addr6, *mask6;
addr6 = (struct in6_addr *)addr;
mask6 = (struct in6_addr *)mask;
ret_val = netlbl_unlhsh_add_addr6(iface, addr6, mask6, secid);
if (audit_buf != NULL)
netlbl_unlabel_audit_addr6(audit_buf,
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. The caller is
* responsible for calling the rcu_read_[un]lock() functions.
*
*/
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)
{
int ret_val = -ENOENT;
struct netlbl_unlhsh_addr4 *entry;
struct audit_buffer *audit_buf = NULL;
struct net_device *dev;
char *secctx = NULL;
u32 secctx_len;
spin_lock(&netlbl_unlhsh_lock);
entry = netlbl_unlhsh_search_addr4(addr->s_addr, iface);
if (entry != NULL &&
entry->addr == addr->s_addr && entry->mask == mask->s_addr) {
entry->valid = 0;
list_del_rcu(&entry->list);
ret_val = 0;
}
spin_unlock(&netlbl_unlhsh_lock);
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_unlabel_audit_addr4(audit_buf,
(dev != NULL ? dev->name : NULL),
entry->addr, entry->mask);
if (dev != NULL)
dev_put(dev);
if (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", ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
if (ret_val == 0)
call_rcu(&entry->rcu, netlbl_unlhsh_free_addr4);
return ret_val;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/**
* 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. The caller is
* responsible for calling the rcu_read_[un]lock() functions.
*
*/
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)
{
int ret_val = -ENOENT;
struct netlbl_unlhsh_addr6 *entry;
struct audit_buffer *audit_buf = NULL;
struct net_device *dev;
char *secctx = NULL;
u32 secctx_len;
spin_lock(&netlbl_unlhsh_lock);
entry = netlbl_unlhsh_search_addr6(addr, iface);
if (entry != NULL &&
(ipv6_addr_equal(&entry->addr, addr) &&
ipv6_addr_equal(&entry->mask, mask))) {
entry->valid = 0;
list_del_rcu(&entry->list);
ret_val = 0;
}
spin_unlock(&netlbl_unlhsh_lock);
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_unlabel_audit_addr6(audit_buf,
(dev != NULL ? dev->name : NULL),
addr, mask);
if (dev != NULL)
dev_put(dev);
if (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", ret_val == 0 ? 1 : 0);
audit_log_end(audit_buf);
}
if (ret_val == 0)
call_rcu(&entry->rcu, netlbl_unlhsh_free_addr6);
return ret_val;
}
#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_unlhsh_addr4 *iter4;
struct netlbl_unlhsh_addr6 *iter6;
spin_lock(&netlbl_unlhsh_lock);
list_for_each_entry_rcu(iter4, &iface->addr4_list, list)
if (iter4->valid)
goto unlhsh_condremove_failure;
list_for_each_entry_rcu(iter6, &iface->addr6_list, list)
if (iter6->valid)
goto unlhsh_condremove_failure;
iface->valid = 0;
if (iface->ifindex > 0)
list_del_rcu(&iface->list);
else
rcu_assign_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);
return;
}
/**
* 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.
*
*/
static 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(net, dev_name);
if (dev == NULL) {
ret_val = -ENODEV;
goto unlhsh_remove_return;
}
iface = netlbl_unlhsh_search_iface(dev->ifindex);
dev_put(dev);
} 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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 (dev->nd_net != &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);
ret_val = genlmsg_reply(ans_skb, info);
if (ret_val != 0)
goto list_failure;
return 0;
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)
{
int ret_val;
char *dev_name;
void *addr;
void *mask;
u32 addr_len;
struct netlbl_audit audit_info;
/* See the note in netlbl_unlabel_staticadd() about not allowing both
* IPv4 and IPv6 in the same entry. */
if (!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]);
return netlbl_unlhsh_remove(&init_net,
dev_name, addr, mask, addr_len,
&audit_info);
}
/**
* netlbl_unlabel_staticremovedef - Handle a STATICREMOVEDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated STATICREMOVEDEF message and remove the default
* unlabeled connection entry. Returns zero on success, negative values on
* failure.
*
*/
static int netlbl_unlabel_staticremovedef(struct sk_buff *skb,
struct genl_info *info)
{
int ret_val;
void *addr;
void *mask;
u32 addr_len;
struct netlbl_audit audit_info;
/* See the note in netlbl_unlabel_staticadd() about not allowing both
* IPv4 and IPv6 in the same entry. */
if (!((!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;
return netlbl_unlhsh_remove(&init_net,
NULL, addr, mask, addr_len,
&audit_info);
}
/**
* netlbl_unlabel_staticlist_gen - Generate messages for STATICLIST[DEF]
* @cmd: command/message
* @iface: the interface entry
* @addr4: the IPv4 address entry
* @addr6: the IPv6 address entry
* @arg: the netlbl_unlhsh_walk_arg structure
*
* Description:
* This function is designed to be used to generate a response for a
* STATICLIST or STATICLISTDEF message. When called either @addr4 or @addr6
* can be specified, not both, the other unspecified entry should be set to
* NULL by the caller. Returns the size of the message on success, negative
* values on failure.
*
*/
static int netlbl_unlabel_staticlist_gen(u32 cmd,
const struct netlbl_unlhsh_iface *iface,
const struct netlbl_unlhsh_addr4 *addr4,
const struct netlbl_unlhsh_addr6 *addr6,
void *arg)
{
int ret_val = -ENOMEM;
struct netlbl_unlhsh_walk_arg *cb_arg = arg;
struct net_device *dev;
void *data;
u32 secid;
char *secctx;
u32 secctx_len;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
cb_arg->seq, &netlbl_unlabel_gnl_family,
NLM_F_MULTI, cmd);
if (data == NULL)
goto list_cb_failure;
if (iface->ifindex > 0) {
dev = dev_get_by_index(&init_net, iface->ifindex);
ret_val = nla_put_string(cb_arg->skb,
NLBL_UNLABEL_A_IFACE, dev->name);
dev_put(dev);
if (ret_val != 0)
goto list_cb_failure;
}
if (addr4) {
struct in_addr addr_struct;
addr_struct.s_addr = addr4->addr;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_IPV4ADDR,
sizeof(struct in_addr),
&addr_struct);
if (ret_val != 0)
goto list_cb_failure;
addr_struct.s_addr = addr4->mask;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_IPV4MASK,
sizeof(struct in_addr),
&addr_struct);
if (ret_val != 0)
goto list_cb_failure;
secid = addr4->secid;
} else {
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_IPV6ADDR,
sizeof(struct in6_addr),
&addr6->addr);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_IPV6MASK,
sizeof(struct in6_addr),
&addr6->mask);
if (ret_val != 0)
goto list_cb_failure;
secid = addr6->secid;
}
ret_val = security_secid_to_secctx(secid, &secctx, &secctx_len);
if (ret_val != 0)
goto list_cb_failure;
ret_val = nla_put(cb_arg->skb,
NLBL_UNLABEL_A_SECCTX,
secctx_len,
secctx);
security_release_secctx(secctx, secctx_len);
if (ret_val != 0)
goto list_cb_failure;
cb_arg->seq++;
return genlmsg_end(cb_arg->skb, data);
list_cb_failure:
genlmsg_cancel(cb_arg->skb, data);
return ret_val;
}
/**
* netlbl_unlabel_staticlist - Handle a STATICLIST message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated STATICLIST message and dump the unlabeled
* connection hash table in a form suitable for use in a kernel generated
* STATICLIST message. Returns the length of @skb.
*
*/
static int netlbl_unlabel_staticlist(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_unlhsh_walk_arg cb_arg;
u32 skip_bkt = cb->args[0];
u32 skip_chain = cb->args[1];
u32 skip_addr4 = cb->args[2];
u32 skip_addr6 = cb->args[3];
u32 iter_bkt;
u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
struct netlbl_unlhsh_iface *iface;
struct netlbl_unlhsh_addr4 *addr4;
struct netlbl_unlhsh_addr6 *addr6;
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
rcu_read_lock();
for (iter_bkt = skip_bkt;
iter_bkt < rcu_dereference(netlbl_unlhsh)->size;
iter_bkt++, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0) {
list_for_each_entry_rcu(iface,
&rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt],
list) {
if (!iface->valid ||
iter_chain++ < skip_chain)
continue;
list_for_each_entry_rcu(addr4,
&iface->addr4_list,
list) {
if (!addr4->valid || iter_addr4++ < skip_addr4)
continue;
if (netlbl_unlabel_staticlist_gen(
NLBL_UNLABEL_C_STATICLIST,
iface,
addr4,
NULL,
&cb_arg) < 0) {
iter_addr4--;
iter_chain--;
goto unlabel_staticlist_return;
}
}
list_for_each_entry_rcu(addr6,
&iface->addr6_list,
list) {
if (!addr6->valid || iter_addr6++ < skip_addr6)
continue;
if (netlbl_unlabel_staticlist_gen(
NLBL_UNLABEL_C_STATICLIST,
iface,
NULL,
addr6,
&cb_arg) < 0) {
iter_addr6--;
iter_chain--;
goto unlabel_staticlist_return;
}
}
}
}
unlabel_staticlist_return:
rcu_read_unlock();
cb->args[0] = skip_bkt;
cb->args[1] = skip_chain;
cb->args[2] = skip_addr4;
cb->args[3] = skip_addr6;
return skb->len;
}
/**
* netlbl_unlabel_staticlistdef - Handle a STATICLISTDEF message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated STATICLISTDEF message and dump the default
* unlabeled connection entry in a form suitable for use in a kernel generated
* STATICLISTDEF message. Returns the length of @skb.
*
*/
static int netlbl_unlabel_staticlistdef(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_unlhsh_walk_arg cb_arg;
struct netlbl_unlhsh_iface *iface;
u32 skip_addr4 = cb->args[0];
u32 skip_addr6 = cb->args[1];
u32 iter_addr4 = 0, iter_addr6 = 0;
struct netlbl_unlhsh_addr4 *addr4;
struct netlbl_unlhsh_addr6 *addr6;
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
rcu_read_lock();
iface = rcu_dereference(netlbl_unlhsh_def);
if (iface == NULL || !iface->valid)
goto unlabel_staticlistdef_return;
list_for_each_entry_rcu(addr4, &iface->addr4_list, list) {
if (!addr4->valid || iter_addr4++ < skip_addr4)
continue;
if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
iface,
addr4,
NULL,
&cb_arg) < 0) {
iter_addr4--;
goto unlabel_staticlistdef_return;
}
}
list_for_each_entry_rcu(addr6, &iface->addr6_list, list) {
if (addr6->valid || iter_addr6++ < skip_addr6)
continue;
if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF,
iface,
NULL,
addr6,
&cb_arg) < 0) {
iter_addr6--;
goto unlabel_staticlistdef_return;
}
}
unlabel_staticlistdef_return:
rcu_read_unlock();
cb->args[0] = skip_addr4;
cb->args[1] = skip_addr6;
return skb->len;
}
/*
* NetLabel Generic NETLINK Command Definitions
*/
static struct genl_ops netlbl_unlabel_genl_ops[] = {
{
.cmd = NLBL_UNLABEL_C_STATICADD,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_staticadd,
.dumpit = NULL,
},
{
.cmd = NLBL_UNLABEL_C_STATICREMOVE,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_staticremove,
.dumpit = NULL,
},
{
.cmd = NLBL_UNLABEL_C_STATICLIST,
.flags = 0,
.policy = netlbl_unlabel_genl_policy,
.doit = NULL,
.dumpit = netlbl_unlabel_staticlist,
},
{
.cmd = NLBL_UNLABEL_C_STATICADDDEF,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_staticadddef,
.dumpit = NULL,
},
{
.cmd = NLBL_UNLABEL_C_STATICREMOVEDEF,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_staticremovedef,
.dumpit = NULL,
},
{
.cmd = NLBL_UNLABEL_C_STATICLISTDEF,
.flags = 0,
.policy = netlbl_unlabel_genl_policy,
.doit = NULL,
.dumpit = netlbl_unlabel_staticlistdef,
},
{
.cmd = NLBL_UNLABEL_C_ACCEPT,
.flags = GENL_ADMIN_PERM,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_accept,
.dumpit = NULL,
},
{
.cmd = NLBL_UNLABEL_C_LIST,
.flags = 0,
.policy = netlbl_unlabel_genl_policy,
.doit = netlbl_unlabel_list,
.dumpit = NULL,
},
};
/*
* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
*
* Description:
* Register the unlabeled packet NetLabel component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int __init netlbl_unlabel_genl_init(void)
{
int ret_val, i;
ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
if (ret_val != 0)
return ret_val;
for (i = 0; i < ARRAY_SIZE(netlbl_unlabel_genl_ops); i++) {
ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
&netlbl_unlabel_genl_ops[i]);
if (ret_val != 0)
return ret_val;
}
return 0;
}
/*
* NetLabel KAPI Hooks
*/
static struct notifier_block netlbl_unlhsh_netdev_notifier = {
.notifier_call = netlbl_unlhsh_netdev_handler,
};
/**
* netlbl_unlabel_init - Initialize the unlabeled connection hash table
* @size: the number of bits to use for the hash buckets
*
* Description:
* Initializes the unlabeled connection hash table and registers a network
* device notification handler. This function should only be called by the
* NetLabel subsystem itself during initialization. Returns zero on success,
* non-zero values on error.
*
*/
int __init netlbl_unlabel_init(u32 size)
{
u32 iter;
struct netlbl_unlhsh_tbl *hsh_tbl;
if (size == 0)
return -EINVAL;
hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
if (hsh_tbl == NULL)
return -ENOMEM;
hsh_tbl->size = 1 << size;
hsh_tbl->tbl = kcalloc(hsh_tbl->size,
sizeof(struct list_head),
GFP_KERNEL);
if (hsh_tbl->tbl == NULL) {
kfree(hsh_tbl);
return -ENOMEM;
}
for (iter = 0; iter < hsh_tbl->size; iter++)
INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
rcu_read_lock();
spin_lock(&netlbl_unlhsh_lock);
rcu_assign_pointer(netlbl_unlhsh, hsh_tbl);
spin_unlock(&netlbl_unlhsh_lock);
rcu_read_unlock();
register_netdevice_notifier(&netlbl_unlhsh_netdev_notifier);
return 0;
}
/**
* netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
* @skb: the packet
* @family: protocol family
* @secattr: the security attributes
*
* Description:
* Determine the security attributes, if any, for an unlabled packet and return
* them in @secattr. Returns zero on success and negative values on failure.
*
*/
int netlbl_unlabel_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr)
{
struct netlbl_unlhsh_iface *iface;
rcu_read_lock();
iface = netlbl_unlhsh_search_iface_def(skb->iif);
if (iface == NULL)
goto unlabel_getattr_nolabel;
switch (family) {
case PF_INET: {
struct iphdr *hdr4;
struct netlbl_unlhsh_addr4 *addr4;
hdr4 = ip_hdr(skb);
addr4 = netlbl_unlhsh_search_addr4(hdr4->saddr, iface);
if (addr4 == NULL)
goto unlabel_getattr_nolabel;
secattr->attr.secid = addr4->secid;
break;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case PF_INET6: {
struct ipv6hdr *hdr6;
struct netlbl_unlhsh_addr6 *addr6;
hdr6 = ipv6_hdr(skb);
addr6 = netlbl_unlhsh_search_addr6(&hdr6->saddr, iface);
if (addr6 == NULL)
goto unlabel_getattr_nolabel;
secattr->attr.secid = addr6->secid;
break;
}
#endif /* IPv6 */
default:
goto unlabel_getattr_nolabel;
}
rcu_read_unlock();
secattr->flags |= NETLBL_SECATTR_SECID;
secattr->type = NETLBL_NLTYPE_UNLABELED;
return 0;
unlabel_getattr_nolabel:
rcu_read_unlock();
if (netlabel_unlabel_acceptflg == 0)
return -ENOMSG;
secattr->type = NETLBL_NLTYPE_UNLABELED;
return 0;
}
/**
* netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
*
* Description:
* Set the default NetLabel configuration to allow incoming unlabeled packets
* and to send unlabeled network traffic by default.
*
*/
int __init netlbl_unlabel_defconf(void)
{
int ret_val;
struct netlbl_dom_map *entry;
struct netlbl_audit audit_info;
/* Only the kernel is allowed to call this function and the only time
* it is called is at bootup before the audit subsystem is reporting
* messages so don't worry to much about these values. */
security_task_getsecid(current, &audit_info.secid);
audit_info.loginuid = 0;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (entry == NULL)
return -ENOMEM;
entry->type = NETLBL_NLTYPE_UNLABELED;
ret_val = netlbl_domhsh_add_default(entry, &audit_info);
if (ret_val != 0)
return ret_val;
netlbl_unlabel_acceptflg_set(1, &audit_info);
return 0;
}
