v4.19.13 snapshot.
diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
new file mode 100644
index 0000000..c92894c
--- /dev/null
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -0,0 +1,1563 @@
+/*
+ * 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,
+ .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,
+ },
+};
+
+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,
+ .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;
+}