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1556 lines
42 KiB
1556 lines
42 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* NetLabel Unlabeled Support |
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* |
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* This file defines functions for dealing with unlabeled packets for the |
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* NetLabel system. The NetLabel system manages static and dynamic label |
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* mappings for network protocols such as CIPSO and RIPSO. |
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* |
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* Author: Paul Moore <[email protected]> |
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*/ |
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|
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/* |
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 - 2008 |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/rcupdate.h> |
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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#include <linux/socket.h> |
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#include <linux/string.h> |
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#include <linux/skbuff.h> |
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#include <linux/audit.h> |
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#include <linux/in.h> |
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#include <linux/in6.h> |
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#include <linux/ip.h> |
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#include <linux/ipv6.h> |
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#include <linux/notifier.h> |
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#include <linux/netdevice.h> |
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#include <linux/security.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> |
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#include <net/netlink.h> |
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#include <net/genetlink.h> |
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#include <net/ip.h> |
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#include <net/ipv6.h> |
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#include <net/net_namespace.h> |
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#include <net/netlabel.h> |
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#include <asm/bug.h> |
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#include <linux/atomic.h> |
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|
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#include "netlabel_user.h" |
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#include "netlabel_addrlist.h" |
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#include "netlabel_domainhash.h" |
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#include "netlabel_unlabeled.h" |
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#include "netlabel_mgmt.h" |
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|
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/* NOTE: at present we always use init's network namespace since we don't |
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* presently support different namespaces even though the majority of |
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* the functions in this file are "namespace safe" */ |
|
|
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/* The unlabeled connection hash table which we use to map network interfaces |
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* and addresses of unlabeled packets to a user specified secid value for the |
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* LSM. The hash table is used to lookup the network interface entry |
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* (struct netlbl_unlhsh_iface) and then the interface entry is used to |
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* lookup an IP address match from an ordered list. If a network interface |
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* match can not be found in the hash table then the default entry |
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* (netlbl_unlhsh_def) is used. The IP address entry list |
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* (struct netlbl_unlhsh_addr) is ordered such that the entries with a |
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* larger netmask come first. |
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*/ |
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struct netlbl_unlhsh_tbl { |
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struct list_head *tbl; |
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u32 size; |
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}; |
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#define netlbl_unlhsh_addr4_entry(iter) \ |
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container_of(iter, struct netlbl_unlhsh_addr4, list) |
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struct netlbl_unlhsh_addr4 { |
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u32 secid; |
|
|
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struct netlbl_af4list list; |
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struct rcu_head rcu; |
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}; |
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#define netlbl_unlhsh_addr6_entry(iter) \ |
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container_of(iter, struct netlbl_unlhsh_addr6, list) |
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struct netlbl_unlhsh_addr6 { |
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u32 secid; |
|
|
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struct netlbl_af6list list; |
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struct rcu_head rcu; |
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}; |
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struct netlbl_unlhsh_iface { |
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int ifindex; |
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struct list_head addr4_list; |
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struct list_head addr6_list; |
|
|
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u32 valid; |
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struct list_head list; |
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struct rcu_head rcu; |
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}; |
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|
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/* Argument struct for netlbl_unlhsh_walk() */ |
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struct netlbl_unlhsh_walk_arg { |
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struct netlink_callback *nl_cb; |
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struct sk_buff *skb; |
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u32 seq; |
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}; |
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|
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/* Unlabeled connection hash table */ |
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/* updates should be so rare that having one spinlock for the entire |
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* hash table should be okay */ |
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static DEFINE_SPINLOCK(netlbl_unlhsh_lock); |
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#define netlbl_unlhsh_rcu_deref(p) \ |
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rcu_dereference_check(p, lockdep_is_held(&netlbl_unlhsh_lock)) |
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static struct netlbl_unlhsh_tbl __rcu *netlbl_unlhsh; |
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static struct netlbl_unlhsh_iface __rcu *netlbl_unlhsh_def; |
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|
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/* Accept unlabeled packets flag */ |
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static u8 netlabel_unlabel_acceptflg; |
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|
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/* NetLabel Generic NETLINK unlabeled family */ |
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static struct genl_family netlbl_unlabel_gnl_family; |
|
|
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/* NetLabel Netlink attribute policy */ |
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static const struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
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[NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
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[NLBL_UNLABEL_A_IPV6ADDR] = { .type = NLA_BINARY, |
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.len = sizeof(struct in6_addr) }, |
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[NLBL_UNLABEL_A_IPV6MASK] = { .type = NLA_BINARY, |
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.len = sizeof(struct in6_addr) }, |
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[NLBL_UNLABEL_A_IPV4ADDR] = { .type = NLA_BINARY, |
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.len = sizeof(struct in_addr) }, |
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[NLBL_UNLABEL_A_IPV4MASK] = { .type = NLA_BINARY, |
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.len = sizeof(struct in_addr) }, |
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[NLBL_UNLABEL_A_IFACE] = { .type = NLA_NUL_STRING, |
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.len = IFNAMSIZ - 1 }, |
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[NLBL_UNLABEL_A_SECCTX] = { .type = NLA_BINARY } |
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}; |
|
|
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/* |
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* Unlabeled Connection Hash Table Functions |
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*/ |
|
|
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/** |
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* netlbl_unlhsh_free_iface - Frees an interface entry from the hash table |
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* @entry: the entry's RCU field |
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* |
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* Description: |
|
* This function is designed to be used as a callback to the call_rcu() |
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* function so that memory allocated to a hash table interface entry can be |
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* released safely. It is important to note that this function does not free |
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* the IPv4 and IPv6 address lists contained as part of an interface entry. It |
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* is up to the rest of the code to make sure an interface entry is only freed |
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* once it's address lists are empty. |
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* |
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*/ |
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static void netlbl_unlhsh_free_iface(struct rcu_head *entry) |
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{ |
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struct netlbl_unlhsh_iface *iface; |
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struct netlbl_af4list *iter4; |
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struct netlbl_af4list *tmp4; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct netlbl_af6list *iter6; |
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struct netlbl_af6list *tmp6; |
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#endif /* IPv6 */ |
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|
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iface = container_of(entry, struct netlbl_unlhsh_iface, rcu); |
|
|
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/* no need for locks here since we are the only one with access to this |
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* structure */ |
|
|
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netlbl_af4list_foreach_safe(iter4, tmp4, &iface->addr4_list) { |
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netlbl_af4list_remove_entry(iter4); |
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kfree(netlbl_unlhsh_addr4_entry(iter4)); |
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} |
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#if IS_ENABLED(CONFIG_IPV6) |
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netlbl_af6list_foreach_safe(iter6, tmp6, &iface->addr6_list) { |
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netlbl_af6list_remove_entry(iter6); |
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kfree(netlbl_unlhsh_addr6_entry(iter6)); |
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} |
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#endif /* IPv6 */ |
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kfree(iface); |
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} |
|
|
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/** |
|
* netlbl_unlhsh_hash - Hashing function for the hash table |
|
* @ifindex: the network interface/device to hash |
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* |
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* Description: |
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* This is the hashing function for the unlabeled hash table, it returns the |
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* bucket number for the given device/interface. The caller is responsible for |
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* ensuring that the hash table is protected with either a RCU read lock or |
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* the hash table lock. |
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* |
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*/ |
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static u32 netlbl_unlhsh_hash(int ifindex) |
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{ |
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return ifindex & (netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->size - 1); |
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} |
|
|
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/** |
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* netlbl_unlhsh_search_iface - Search for a matching interface entry |
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* @ifindex: the network interface |
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* |
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* Description: |
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* Searches the unlabeled connection hash table and returns a pointer to the |
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* interface entry which matches @ifindex, otherwise NULL is returned. The |
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* caller is responsible for ensuring that the hash table is protected with |
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* either a RCU read lock or the hash table lock. |
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* |
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*/ |
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static struct netlbl_unlhsh_iface *netlbl_unlhsh_search_iface(int ifindex) |
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{ |
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u32 bkt; |
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struct list_head *bkt_list; |
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struct netlbl_unlhsh_iface *iter; |
|
|
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bkt = netlbl_unlhsh_hash(ifindex); |
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bkt_list = &netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]; |
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list_for_each_entry_rcu(iter, bkt_list, list, |
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lockdep_is_held(&netlbl_unlhsh_lock)) |
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if (iter->valid && iter->ifindex == ifindex) |
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return iter; |
|
|
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return NULL; |
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} |
|
|
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/** |
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* netlbl_unlhsh_add_addr4 - Add a new IPv4 address entry to the hash table |
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* @iface: the associated interface entry |
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* @addr: IPv4 address in network byte order |
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* @mask: IPv4 address mask in network byte order |
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* @secid: LSM secid value for entry |
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* |
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* Description: |
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* Add a new address entry into the unlabeled connection hash table using the |
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* interface entry specified by @iface. On success zero is returned, otherwise |
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* a negative value is returned. |
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* |
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*/ |
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static int netlbl_unlhsh_add_addr4(struct netlbl_unlhsh_iface *iface, |
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const struct in_addr *addr, |
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const struct in_addr *mask, |
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u32 secid) |
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{ |
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int ret_val; |
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struct netlbl_unlhsh_addr4 *entry; |
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|
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
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if (entry == NULL) |
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return -ENOMEM; |
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|
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entry->list.addr = addr->s_addr & mask->s_addr; |
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entry->list.mask = mask->s_addr; |
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entry->list.valid = 1; |
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entry->secid = secid; |
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|
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spin_lock(&netlbl_unlhsh_lock); |
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ret_val = netlbl_af4list_add(&entry->list, &iface->addr4_list); |
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spin_unlock(&netlbl_unlhsh_lock); |
|
|
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if (ret_val != 0) |
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kfree(entry); |
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return ret_val; |
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} |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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/** |
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* netlbl_unlhsh_add_addr6 - Add a new IPv6 address entry to the hash table |
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* @iface: the associated interface entry |
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* @addr: IPv6 address in network byte order |
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* @mask: IPv6 address mask in network byte order |
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* @secid: LSM secid value for entry |
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* |
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* Description: |
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* Add a new address entry into the unlabeled connection hash table using the |
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* interface entry specified by @iface. On success zero is returned, otherwise |
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* a negative value is returned. |
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* |
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*/ |
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static int netlbl_unlhsh_add_addr6(struct netlbl_unlhsh_iface *iface, |
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const struct in6_addr *addr, |
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const struct in6_addr *mask, |
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u32 secid) |
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{ |
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int ret_val; |
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struct netlbl_unlhsh_addr6 *entry; |
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|
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entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
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if (entry == NULL) |
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return -ENOMEM; |
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|
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entry->list.addr = *addr; |
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entry->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; |
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entry->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; |
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entry->list.addr.s6_addr32[2] &= mask->s6_addr32[2]; |
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entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3]; |
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entry->list.mask = *mask; |
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entry->list.valid = 1; |
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entry->secid = secid; |
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|
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spin_lock(&netlbl_unlhsh_lock); |
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ret_val = netlbl_af6list_add(&entry->list, &iface->addr6_list); |
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spin_unlock(&netlbl_unlhsh_lock); |
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|
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if (ret_val != 0) |
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kfree(entry); |
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return 0; |
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} |
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#endif /* IPv6 */ |
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|
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/** |
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* netlbl_unlhsh_add_iface - Adds a new interface entry to the hash table |
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* @ifindex: network interface |
|
* |
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* Description: |
|
* Add a new, empty, interface entry into the unlabeled connection hash table. |
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* On success a pointer to the new interface entry is returned, on failure NULL |
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* is returned. |
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* |
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*/ |
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static struct netlbl_unlhsh_iface *netlbl_unlhsh_add_iface(int ifindex) |
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{ |
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u32 bkt; |
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struct netlbl_unlhsh_iface *iface; |
|
|
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iface = kzalloc(sizeof(*iface), GFP_ATOMIC); |
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if (iface == NULL) |
|
return NULL; |
|
|
|
iface->ifindex = ifindex; |
|
INIT_LIST_HEAD(&iface->addr4_list); |
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INIT_LIST_HEAD(&iface->addr6_list); |
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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, |
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&netlbl_unlhsh_rcu_deref(netlbl_unlhsh)->tbl[bkt]); |
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} else { |
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INIT_LIST_HEAD(&iface->list); |
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if (netlbl_unlhsh_rcu_deref(netlbl_unlhsh_def) != NULL) |
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goto add_iface_failure; |
|
rcu_assign_pointer(netlbl_unlhsh_def, iface); |
|
} |
|
spin_unlock(&netlbl_unlhsh_lock); |
|
|
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return iface; |
|
|
|
add_iface_failure: |
|
spin_unlock(&netlbl_unlhsh_lock); |
|
kfree(iface); |
|
return NULL; |
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} |
|
|
|
/** |
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* 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, |
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const void *addr, |
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const void *mask, |
|
u32 addr_len, |
|
u32 secid, |
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struct netlbl_audit *audit_info) |
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{ |
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int ret_val; |
|
int ifindex; |
|
struct net_device *dev; |
|
struct netlbl_unlhsh_iface *iface; |
|
struct audit_buffer *audit_buf = NULL; |
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char *secctx = NULL; |
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u32 secctx_len; |
|
|
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if (addr_len != sizeof(struct in_addr) && |
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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) { |
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ret_val = -ENODEV; |
|
goto unlhsh_add_return; |
|
} |
|
ifindex = dev->ifindex; |
|
iface = netlbl_unlhsh_search_iface(ifindex); |
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} else { |
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ifindex = 0; |
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iface = rcu_dereference(netlbl_unlhsh_def); |
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} |
|
if (iface == NULL) { |
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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; |
|
|
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ret_val = netlbl_unlhsh_add_addr4(iface, addr4, mask4, secid); |
|
if (audit_buf != NULL) |
|
netlbl_af4list_audit_addr(audit_buf, 1, |
|
dev_name, |
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addr4->s_addr, |
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mask4->s_addr); |
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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); |
|
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); |
|
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(&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(&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(&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(&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(&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 skip_addr4 = cb->args[2]; |
|
u32 iter_bkt, 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) |
|
u32 skip_addr6 = cb->args[3]; |
|
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_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++ < skip_addr4) |
|
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; |
|
} |
|
} |
|
iter_addr4 = 0; |
|
skip_addr4 = 0; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach_rcu(addr6, |
|
&iface->addr6_list) { |
|
if (iter_addr6++ < skip_addr6) |
|
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; |
|
} |
|
} |
|
iter_addr6 = 0; |
|
skip_addr6 = 0; |
|
#endif /* IPv6 */ |
|
} |
|
iter_chain = 0; |
|
skip_chain = 0; |
|
} |
|
|
|
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_small_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, |
|
.small_ops = netlbl_unlabel_genl_ops, |
|
.n_small_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_subj(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; |
|
}
|
|
|