diff options
| -rw-r--r-- | include/net/netlabel.h | 6 | ||||
| -rw-r--r-- | net/netlabel/netlabel_kapi.c | 16 | ||||
| -rw-r--r-- | net/netlabel/netlabel_unlabeled.c | 1375 | ||||
| -rw-r--r-- | net/netlabel/netlabel_unlabeled.h | 145 |
4 files changed, 1524 insertions, 18 deletions
diff --git a/include/net/netlabel.h b/include/net/netlabel.h index a3bffb4bb74..b3213c7c530 100644 --- a/include/net/netlabel.h +++ b/include/net/netlabel.h @@ -67,7 +67,11 @@ * NetLabel NETLINK protocol */ -#define NETLBL_PROTO_VERSION 1 +/* NetLabel NETLINK protocol version + * 1: initial version + * 2: added static labels for unlabeled connections + */ +#define NETLBL_PROTO_VERSION 2 /* NetLabel NETLINK types/families */ #define NETLBL_NLTYPE_NONE 0 diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c index 49146153f23..c69e3e1f05c 100644 --- a/net/netlabel/netlabel_kapi.c +++ b/net/netlabel/netlabel_kapi.c @@ -312,7 +312,7 @@ socket_setattr_return: * @secattr: the security attributes * * Description: - * Examines the given sock to see any NetLabel style labeling has been + * Examines the given sock to see if any NetLabel style labeling has been * applied to the sock, if so it parses the socket label and returns the * security attributes in @secattr. Returns zero on success, negative values * on failure. @@ -320,13 +320,7 @@ socket_setattr_return: */ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr) { - int ret_val; - - ret_val = cipso_v4_sock_getattr(sk, secattr); - if (ret_val == 0) - return 0; - - return netlbl_unlabel_getattr(secattr); + return cipso_v4_sock_getattr(sk, secattr); } /** @@ -350,7 +344,7 @@ int netlbl_skbuff_getattr(const struct sk_buff *skb, cipso_v4_skbuff_getattr(skb, secattr) == 0) return 0; - return netlbl_unlabel_getattr(secattr); + return netlbl_unlabel_getattr(skb, family, secattr); } /** @@ -434,6 +428,10 @@ static int __init netlbl_init(void) if (ret_val != 0) goto init_failure; + ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE); + if (ret_val != 0) + goto init_failure; + ret_val = netlbl_netlink_init(); if (ret_val != 0) goto init_failure; diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c index 7f5df0cbc63..d0c628c875a 100644 --- a/net/netlabel/netlabel_unlabeled.c +++ b/net/netlabel/netlabel_unlabeled.c @@ -10,7 +10,7 @@ */ /* - * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 + * (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 @@ -29,27 +29,99 @@ */ #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 CIPSOv4 family */ +/* NetLabel Generic NETLINK unlabeled family */ static struct genl_family netlbl_unlabel_gnl_family = { .id = GENL_ID_GENERATE, .hdrsize = 0, @@ -61,11 +133,681 @@ static struct genl_family netlbl_unlabel_gnl_family = { /* 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 } }; /* - * Helper Functions + * 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 + * + * 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) +{ + int ret_val; + int ifindex; + 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_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; + } + } + switch (addr_len) { + case sizeof(struct in_addr): + ret_val = netlbl_unlhsh_add_addr4(iface, addr, mask, secid); + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case sizeof(struct in6_addr): + ret_val = netlbl_unlhsh_add_addr6(iface, addr, mask, secid); + break; +#endif /* IPv6 */ + default: + ret_val = -EINVAL; + } + if (ret_val == 0) + atomic_inc(&netlabel_mgmt_protocount); + +unlhsh_add_return: + rcu_read_unlock(); + return ret_val; +} + +/** + * netlbl_unlhsh_remove_addr4 - Remove an IPv4 address entry + * @iface: interface entry + * @addr: IP address + * @mask: IP address mask + * + * 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 netlbl_unlhsh_iface *iface, + const struct in_addr *addr, + const struct in_addr *mask) +{ + int ret_val = -ENOENT; + struct netlbl_unlhsh_addr4 *entry; + + 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); + + 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 + * @iface: interface entry + * @addr: IP address + * @mask: IP address mask + * + * 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 netlbl_unlhsh_iface *iface, + const struct in6_addr *addr, + const struct in6_addr *mask) +{ + int ret_val = -ENOENT; + struct netlbl_unlhsh_addr6 *entry; + + 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); + + 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) + * + * 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) +{ + 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(iface, addr, mask); + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case sizeof(struct in6_addr): + ret_val = netlbl_unlhsh_remove_addr6(iface, addr, mask); + 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 @@ -93,6 +835,48 @@ static void netlbl_unlabel_acceptflg_set(u8 value, } } +/** + * 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 */ @@ -168,11 +952,470 @@ list_failure: 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; + + /* 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; + + 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); +} + +/** + * 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; + + /* 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; + + 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); +} + +/** + * 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; + + /* 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; + + 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); +} + +/** + * 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; + + /* 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; + + 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); +} + + +/** + * 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, &am |