| /* |
| * 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@paul-moore.com> |
| * |
| */ |
| |
| /* |
| * (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, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #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 __rcu *netlbl_unlhsh; |
| static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def; |
| |
| /* Accept unlabeled packets flag */ |
| static u8 netlabel_unlabel_acceptflg; |
| |
| /* NetLabel Generic NETLINK unlabeled family */ |
| 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 } |
| }; |
| |
| /* |
| * 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 netdevice notifier info (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 = netdev_notifier_info_to_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] && |
| info->attrs[NLBL_UNLABEL_A_IPV4MASK]) { |
| 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) |
| { |
| 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).portid, |
| 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); |
| if (!dev) { |
| ret_val = -ENODEV; |
| goto list_cb_failure; |
| } |
| 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->list.addr; |
| ret_val = nla_put_in_addr(cb_arg->skb, |
| NLBL_UNLABEL_A_IPV4ADDR, |
| addr_struct.s_addr); |
| if (ret_val != 0) |
| goto list_cb_failure; |
| |
| addr_struct.s_addr = addr4->list.mask; |
| ret_val = nla_put_in_addr(cb_arg->skb, |
| NLBL_UNLABEL_A_IPV4MASK, |
| addr_struct.s_addr); |
| if (ret_val != 0) |
| goto list_cb_failure; |
| |
| secid = addr4->secid; |
| } else { |
| ret_val = nla_put_in6_addr(cb_arg->skb, |
| NLBL_UNLABEL_A_IPV6ADDR, |
| &addr6->list.addr); |
| if (ret_val != 0) |
| goto list_cb_failure; |
| |
| ret_val = nla_put_in6_addr(cb_arg->skb, |
| NLBL_UNLABEL_A_IPV6MASK, |
| &addr6->list.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++; |
| genlmsg_end(cb_arg->skb, data); |
| return 0; |
| |
| 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 iter_bkt; |
| u32 iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0; |
| struct netlbl_unlhsh_iface *iface; |
| struct list_head *iter_list; |
| struct netlbl_af4list *addr4; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct netlbl_af6list *addr6; |
| #endif |
| |
| 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) { |
| iter_list = &rcu_dereference(netlbl_unlhsh)->tbl[iter_bkt]; |
| list_for_each_entry_rcu(iface, iter_list, list) { |
| if (!iface->valid || |
| iter_chain++ < skip_chain) |
| continue; |
| netlbl_af4list_foreach_rcu(addr4, |
| &iface->addr4_list) { |
| if (iter_addr4++ < cb->args[2]) |
| continue; |
| if (netlbl_unlabel_staticlist_gen( |
| NLBL_UNLABEL_C_STATICLIST, |
| iface, |
| netlbl_unlhsh_addr4_entry(addr4), |
| NULL, |
| &cb_arg) < 0) { |
| iter_addr4--; |
| iter_chain--; |
| goto unlabel_staticlist_return; |
| } |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| netlbl_af6list_foreach_rcu(addr6, |
| &iface->addr6_list) { |
| if (iter_addr6++ < cb->args[3]) |
| continue; |
| if (netlbl_unlabel_staticlist_gen( |
| NLBL_UNLABEL_C_STATICLIST, |
| iface, |
| NULL, |
| netlbl_unlhsh_addr6_entry(addr6), |
| &cb_arg) < 0) { |
| iter_addr6--; |
| iter_chain--; |
| goto unlabel_staticlist_return; |
| } |
| } |
| #endif /* IPv6 */ |
| } |
| } |
| |
| unlabel_staticlist_return: |
| rcu_read_unlock(); |
| cb->args[0] = iter_bkt; |
| cb->args[1] = iter_chain; |
| cb->args[2] = iter_addr4; |
| cb->args[3] = iter_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 iter_addr4 = 0, iter_addr6 = 0; |
| struct netlbl_af4list *addr4; |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct netlbl_af6list *addr6; |
| #endif |
| |
| 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; |
| |
| netlbl_af4list_foreach_rcu(addr4, &iface->addr4_list) { |
| if (iter_addr4++ < cb->args[0]) |
| continue; |
| if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, |
| iface, |
| netlbl_unlhsh_addr4_entry(addr4), |
| NULL, |
| &cb_arg) < 0) { |
| iter_addr4--; |
| goto unlabel_staticlistdef_return; |
| } |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| netlbl_af6list_foreach_rcu(addr6, &iface->addr6_list) { |
| if (iter_addr6++ < cb->args[1]) |
| continue; |
| if (netlbl_unlabel_staticlist_gen(NLBL_UNLABEL_C_STATICLISTDEF, |
| iface, |
| NULL, |
| netlbl_unlhsh_addr6_entry(addr6), |
| &cb_arg) < 0) { |
| iter_addr6--; |
| goto unlabel_staticlistdef_return; |
| } |
| } |
| #endif /* IPv6 */ |
| |
| unlabel_staticlistdef_return: |
| rcu_read_unlock(); |
| cb->args[0] = iter_addr4; |
| cb->args[1] = iter_addr6; |
| return skb->len; |
| } |
| |
| /* |
| * NetLabel Generic NETLINK Command Definitions |
| */ |
| |
| static const struct genl_ops netlbl_unlabel_genl_ops[] = { |
| { |
| .cmd = NLBL_UNLABEL_C_STATICADD, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = netlbl_unlabel_staticadd, |
| .dumpit = NULL, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_STATICREMOVE, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = netlbl_unlabel_staticremove, |
| .dumpit = NULL, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_STATICLIST, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = 0, |
| .doit = NULL, |
| .dumpit = netlbl_unlabel_staticlist, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_STATICADDDEF, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = netlbl_unlabel_staticadddef, |
| .dumpit = NULL, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_STATICREMOVEDEF, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = netlbl_unlabel_staticremovedef, |
| .dumpit = NULL, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_STATICLISTDEF, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = 0, |
| .doit = NULL, |
| .dumpit = netlbl_unlabel_staticlistdef, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_ACCEPT, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = GENL_ADMIN_PERM, |
| .doit = netlbl_unlabel_accept, |
| .dumpit = NULL, |
| }, |
| { |
| .cmd = NLBL_UNLABEL_C_LIST, |
| .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
| .flags = 0, |
| .doit = netlbl_unlabel_list, |
| .dumpit = NULL, |
| }, |
| }; |
| |
| static struct genl_family netlbl_unlabel_gnl_family __ro_after_init = { |
| .hdrsize = 0, |
| .name = NETLBL_NLTYPE_UNLABELED_NAME, |
| .version = NETLBL_PROTO_VERSION, |
| .maxattr = NLBL_UNLABEL_A_MAX, |
| .policy = netlbl_unlabel_genl_policy, |
| .module = THIS_MODULE, |
| .ops = netlbl_unlabel_genl_ops, |
| .n_ops = ARRAY_SIZE(netlbl_unlabel_genl_ops), |
| }; |
| |
| /* |
| * 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) |
| { |
| return genl_register_family(&netlbl_unlabel_gnl_family); |
| } |
| |
| /* |
| * 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]); |
| |
| spin_lock(&netlbl_unlhsh_lock); |
| rcu_assign_pointer(netlbl_unlhsh, hsh_tbl); |
| spin_unlock(&netlbl_unlhsh_lock); |
| |
| 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(skb->skb_iif); |
| if (iface == NULL) |
| iface = rcu_dereference(netlbl_unlhsh_def); |
| if (iface == NULL || !iface->valid) |
| goto unlabel_getattr_nolabel; |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| /* When resolving a fallback label, check the sk_buff version as |
| * it is possible (e.g. SCTP) to have family = PF_INET6 while |
| * receiving ip_hdr(skb)->version = 4. |
| */ |
| if (family == PF_INET6 && ip_hdr(skb)->version == 4) |
| family = PF_INET; |
| #endif /* IPv6 */ |
| |
| switch (family) { |
| case PF_INET: { |
| struct iphdr *hdr4; |
| struct netlbl_af4list *addr4; |
| |
| hdr4 = ip_hdr(skb); |
| addr4 = netlbl_af4list_search(hdr4->saddr, |
| &iface->addr4_list); |
| if (addr4 == NULL) |
| goto unlabel_getattr_nolabel; |
| secattr->attr.secid = netlbl_unlhsh_addr4_entry(addr4)->secid; |
| break; |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| case PF_INET6: { |
| struct ipv6hdr *hdr6; |
| struct netlbl_af6list *addr6; |
| |
| hdr6 = ipv6_hdr(skb); |
| addr6 = netlbl_af6list_search(&hdr6->saddr, |
| &iface->addr6_list); |
| if (addr6 == NULL) |
| goto unlabel_getattr_nolabel; |
| secattr->attr.secid = netlbl_unlhsh_addr6_entry(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 = GLOBAL_ROOT_UID; |
| audit_info.sessionid = 0; |
| |
| entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| if (entry == NULL) |
| return -ENOMEM; |
| entry->family = AF_UNSPEC; |
| entry->def.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; |
| } |