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![Jeff Kirsher](/assets/img/avatar_default.png)
Several files refer to an old address for the Free Software Foundation in the file header comment. Resolve by replacing the address with the URL <http://www.gnu.org/licenses/> so that we do not have to keep updating the header comments anytime the address changes. CC: Paul Moore <paul@paul-moore.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
790 lines
22 KiB
C
790 lines
22 KiB
C
/*
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* NetLabel Domain Hash Table
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*
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* This file manages the domain hash table that NetLabel uses to determine
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* which network labeling protocol to use for a given domain. The NetLabel
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* system manages static and dynamic label mappings for network protocols such
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* as CIPSO and RIPSO.
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*
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* Author: Paul Moore <paul@paul-moore.com>
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/types.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/audit.h>
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#include <linux/slab.h>
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#include <net/netlabel.h>
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#include <net/cipso_ipv4.h>
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#include <asm/bug.h>
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#include "netlabel_mgmt.h"
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#include "netlabel_addrlist.h"
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#include "netlabel_domainhash.h"
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#include "netlabel_user.h"
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struct netlbl_domhsh_tbl {
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struct list_head *tbl;
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u32 size;
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};
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/* Domain hash table */
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/* updates should be so rare that having one spinlock for the entire hash table
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* should be okay */
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static DEFINE_SPINLOCK(netlbl_domhsh_lock);
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#define netlbl_domhsh_rcu_deref(p) \
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rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock))
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static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL;
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static struct netlbl_dom_map *netlbl_domhsh_def = NULL;
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/*
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* Domain Hash Table Helper Functions
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*/
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/**
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* netlbl_domhsh_free_entry - Frees a domain hash table entry
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* @entry: the entry's RCU field
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*
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* Description:
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* This function is designed to be used as a callback to the call_rcu()
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* function so that the memory allocated to a hash table entry can be released
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* safely.
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*
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*/
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static void netlbl_domhsh_free_entry(struct rcu_head *entry)
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{
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struct netlbl_dom_map *ptr;
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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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ptr = container_of(entry, struct netlbl_dom_map, rcu);
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if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) {
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netlbl_af4list_foreach_safe(iter4, tmp4,
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&ptr->def.addrsel->list4) {
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netlbl_af4list_remove_entry(iter4);
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kfree(netlbl_domhsh_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,
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&ptr->def.addrsel->list6) {
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netlbl_af6list_remove_entry(iter6);
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kfree(netlbl_domhsh_addr6_entry(iter6));
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}
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#endif /* IPv6 */
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}
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kfree(ptr->domain);
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kfree(ptr);
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}
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/**
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* netlbl_domhsh_hash - Hashing function for the domain hash table
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* @domain: the domain name to hash
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*
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* Description:
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* This is the hashing function for the domain hash table, it returns the
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* correct bucket number for the domain. The caller is responsible for
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* ensuring that the hash table is protected with either a RCU read lock or the
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* hash table lock.
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*
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*/
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static u32 netlbl_domhsh_hash(const char *key)
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{
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u32 iter;
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u32 val;
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u32 len;
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/* This is taken (with slight modification) from
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* security/selinux/ss/symtab.c:symhash() */
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for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
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val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
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return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
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}
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/**
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* netlbl_domhsh_search - Search for a domain entry
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* @domain: the domain
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*
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* Description:
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* Searches the domain hash table and returns a pointer to the hash table
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* entry if found, otherwise NULL is returned. The caller is responsible for
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* ensuring that the hash table is protected with either a RCU read lock or the
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* hash table lock.
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*
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*/
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static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain)
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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_dom_map *iter;
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if (domain != NULL) {
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bkt = netlbl_domhsh_hash(domain);
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bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
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list_for_each_entry_rcu(iter, bkt_list, list)
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if (iter->valid && strcmp(iter->domain, domain) == 0)
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return iter;
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}
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return NULL;
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}
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/**
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* netlbl_domhsh_search_def - Search for a domain entry
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* @domain: the domain
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* @def: return default if no match is found
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*
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* Description:
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* Searches the domain hash table and returns a pointer to the hash table
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* entry if an exact match is found, if an exact match is not present in the
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* hash table then the default entry is returned if valid otherwise NULL is
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* returned. The caller is responsible ensuring that the hash table is
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* protected with 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_dom_map *netlbl_domhsh_search_def(const char *domain)
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{
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struct netlbl_dom_map *entry;
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entry = netlbl_domhsh_search(domain);
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if (entry == NULL) {
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entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def);
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if (entry != NULL && !entry->valid)
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entry = NULL;
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}
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return entry;
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}
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/**
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* netlbl_domhsh_audit_add - Generate an audit entry for an add event
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* @entry: the entry being added
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* @addr4: the IPv4 address information
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* @addr6: the IPv6 address information
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* @result: the result code
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Generate an audit record for adding a new NetLabel/LSM mapping entry with
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* the given information. Caller is responsible for holding the necessary
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* locks.
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*
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*/
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static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
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struct netlbl_af4list *addr4,
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struct netlbl_af6list *addr6,
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int result,
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struct netlbl_audit *audit_info)
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{
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struct audit_buffer *audit_buf;
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struct cipso_v4_doi *cipsov4 = NULL;
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u32 type;
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audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
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if (audit_buf != NULL) {
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audit_log_format(audit_buf, " nlbl_domain=%s",
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entry->domain ? entry->domain : "(default)");
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if (addr4 != NULL) {
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struct netlbl_domaddr4_map *map4;
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map4 = netlbl_domhsh_addr4_entry(addr4);
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type = map4->def.type;
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cipsov4 = map4->def.cipso;
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netlbl_af4list_audit_addr(audit_buf, 0, NULL,
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addr4->addr, addr4->mask);
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (addr6 != NULL) {
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struct netlbl_domaddr6_map *map6;
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map6 = netlbl_domhsh_addr6_entry(addr6);
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type = map6->def.type;
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netlbl_af6list_audit_addr(audit_buf, 0, NULL,
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&addr6->addr, &addr6->mask);
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#endif /* IPv6 */
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} else {
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type = entry->def.type;
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cipsov4 = entry->def.cipso;
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}
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switch (type) {
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case NETLBL_NLTYPE_UNLABELED:
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audit_log_format(audit_buf, " nlbl_protocol=unlbl");
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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BUG_ON(cipsov4 == NULL);
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audit_log_format(audit_buf,
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" nlbl_protocol=cipsov4 cipso_doi=%u",
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cipsov4->doi);
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break;
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}
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audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
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audit_log_end(audit_buf);
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}
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}
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/**
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* netlbl_domhsh_validate - Validate a new domain mapping entry
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* @entry: the entry to validate
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*
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* This function validates the new domain mapping entry to ensure that it is
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* a valid entry. Returns zero on success, negative values on failure.
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*
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*/
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static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry)
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{
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struct netlbl_af4list *iter4;
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struct netlbl_domaddr4_map *map4;
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#if IS_ENABLED(CONFIG_IPV6)
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struct netlbl_af6list *iter6;
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struct netlbl_domaddr6_map *map6;
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#endif /* IPv6 */
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if (entry == NULL)
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return -EINVAL;
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switch (entry->def.type) {
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case NETLBL_NLTYPE_UNLABELED:
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if (entry->def.cipso != NULL || entry->def.addrsel != NULL)
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return -EINVAL;
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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if (entry->def.cipso == NULL)
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return -EINVAL;
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break;
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case NETLBL_NLTYPE_ADDRSELECT:
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netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) {
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map4 = netlbl_domhsh_addr4_entry(iter4);
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switch (map4->def.type) {
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case NETLBL_NLTYPE_UNLABELED:
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if (map4->def.cipso != NULL)
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return -EINVAL;
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break;
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case NETLBL_NLTYPE_CIPSOV4:
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if (map4->def.cipso == NULL)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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}
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#if IS_ENABLED(CONFIG_IPV6)
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netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) {
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map6 = netlbl_domhsh_addr6_entry(iter6);
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switch (map6->def.type) {
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case NETLBL_NLTYPE_UNLABELED:
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break;
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default:
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return -EINVAL;
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}
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}
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#endif /* IPv6 */
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Domain Hash Table Functions
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*/
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/**
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* netlbl_domhsh_init - Init for the domain hash
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* @size: the number of bits to use for the hash buckets
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*
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* Description:
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* Initializes the domain hash table, should be called only by
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* netlbl_user_init() during initialization. Returns zero on success, non-zero
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* values on error.
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*
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*/
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int __init netlbl_domhsh_init(u32 size)
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{
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u32 iter;
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struct netlbl_domhsh_tbl *hsh_tbl;
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if (size == 0)
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return -EINVAL;
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hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
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if (hsh_tbl == NULL)
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return -ENOMEM;
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hsh_tbl->size = 1 << size;
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hsh_tbl->tbl = kcalloc(hsh_tbl->size,
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sizeof(struct list_head),
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GFP_KERNEL);
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if (hsh_tbl->tbl == NULL) {
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kfree(hsh_tbl);
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return -ENOMEM;
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}
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for (iter = 0; iter < hsh_tbl->size; iter++)
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INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
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spin_lock(&netlbl_domhsh_lock);
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rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
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spin_unlock(&netlbl_domhsh_lock);
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return 0;
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}
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/**
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* netlbl_domhsh_add - Adds a entry to the domain hash table
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* @entry: the entry to add
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* @audit_info: NetLabel audit information
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*
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* Description:
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* Adds a new entry to the domain hash table and handles any updates to the
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* lower level protocol handler (i.e. CIPSO). Returns zero on success,
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* negative on failure.
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*
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*/
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int netlbl_domhsh_add(struct netlbl_dom_map *entry,
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struct netlbl_audit *audit_info)
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{
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int ret_val = 0;
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struct netlbl_dom_map *entry_old;
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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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ret_val = netlbl_domhsh_validate(entry);
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if (ret_val != 0)
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return ret_val;
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/* XXX - we can remove this RCU read lock as the spinlock protects the
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* entire function, but before we do we need to fixup the
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* netlbl_af[4,6]list RCU functions to do "the right thing" with
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* respect to rcu_dereference() when only a spinlock is held. */
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rcu_read_lock();
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spin_lock(&netlbl_domhsh_lock);
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if (entry->domain != NULL)
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entry_old = netlbl_domhsh_search(entry->domain);
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else
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entry_old = netlbl_domhsh_search_def(entry->domain);
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if (entry_old == NULL) {
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entry->valid = 1;
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if (entry->domain != NULL) {
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u32 bkt = netlbl_domhsh_hash(entry->domain);
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list_add_tail_rcu(&entry->list,
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&rcu_dereference(netlbl_domhsh)->tbl[bkt]);
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} else {
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INIT_LIST_HEAD(&entry->list);
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rcu_assign_pointer(netlbl_domhsh_def, entry);
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}
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if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
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netlbl_af4list_foreach_rcu(iter4,
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&entry->def.addrsel->list4)
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netlbl_domhsh_audit_add(entry, iter4, NULL,
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ret_val, audit_info);
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#if IS_ENABLED(CONFIG_IPV6)
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netlbl_af6list_foreach_rcu(iter6,
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&entry->def.addrsel->list6)
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netlbl_domhsh_audit_add(entry, NULL, iter6,
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ret_val, audit_info);
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#endif /* IPv6 */
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} else
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netlbl_domhsh_audit_add(entry, NULL, NULL,
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ret_val, audit_info);
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} else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
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entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
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struct list_head *old_list4;
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struct list_head *old_list6;
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old_list4 = &entry_old->def.addrsel->list4;
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old_list6 = &entry_old->def.addrsel->list6;
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/* we only allow the addition of address selectors if all of
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* the selectors do not exist in the existing domain map */
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netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
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if (netlbl_af4list_search_exact(iter4->addr,
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iter4->mask,
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old_list4)) {
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ret_val = -EEXIST;
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goto add_return;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
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if (netlbl_af6list_search_exact(&iter6->addr,
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&iter6->mask,
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old_list6)) {
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ret_val = -EEXIST;
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goto add_return;
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}
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#endif /* IPv6 */
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netlbl_af4list_foreach_safe(iter4, tmp4,
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&entry->def.addrsel->list4) {
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netlbl_af4list_remove_entry(iter4);
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iter4->valid = 1;
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ret_val = netlbl_af4list_add(iter4, old_list4);
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netlbl_domhsh_audit_add(entry_old, iter4, NULL,
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ret_val, audit_info);
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if (ret_val != 0)
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goto add_return;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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netlbl_af6list_foreach_safe(iter6, tmp6,
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&entry->def.addrsel->list6) {
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netlbl_af6list_remove_entry(iter6);
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iter6->valid = 1;
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ret_val = netlbl_af6list_add(iter6, old_list6);
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netlbl_domhsh_audit_add(entry_old, NULL, iter6,
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ret_val, audit_info);
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if (ret_val != 0)
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goto add_return;
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}
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#endif /* IPv6 */
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} else
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ret_val = -EINVAL;
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add_return:
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spin_unlock(&netlbl_domhsh_lock);
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|
rcu_read_unlock();
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_add_default - Adds the default entry to the domain hash table
|
|
* @entry: the entry to add
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Adds a new default entry to the domain hash table and handles any updates
|
|
* to the lower level protocol handler (i.e. CIPSO). Returns zero on success,
|
|
* negative on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
return netlbl_domhsh_add(entry, audit_info);
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_remove_entry - Removes a given entry from the domain table
|
|
* @entry: the entry to remove
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Removes an entry from the domain hash table and handles any updates to the
|
|
* lower level protocol handler (i.e. CIPSO). Caller is responsible for
|
|
* ensuring that the RCU read lock is held. Returns zero on success, negative
|
|
* on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
int ret_val = 0;
|
|
struct audit_buffer *audit_buf;
|
|
|
|
if (entry == NULL)
|
|
return -ENOENT;
|
|
|
|
spin_lock(&netlbl_domhsh_lock);
|
|
if (entry->valid) {
|
|
entry->valid = 0;
|
|
if (entry != rcu_dereference(netlbl_domhsh_def))
|
|
list_del_rcu(&entry->list);
|
|
else
|
|
RCU_INIT_POINTER(netlbl_domhsh_def, NULL);
|
|
} else
|
|
ret_val = -ENOENT;
|
|
spin_unlock(&netlbl_domhsh_lock);
|
|
|
|
audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
|
|
if (audit_buf != NULL) {
|
|
audit_log_format(audit_buf,
|
|
" nlbl_domain=%s res=%u",
|
|
entry->domain ? entry->domain : "(default)",
|
|
ret_val == 0 ? 1 : 0);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
|
|
if (ret_val == 0) {
|
|
struct netlbl_af4list *iter4;
|
|
struct netlbl_domaddr4_map *map4;
|
|
|
|
switch (entry->def.type) {
|
|
case NETLBL_NLTYPE_ADDRSELECT:
|
|
netlbl_af4list_foreach_rcu(iter4,
|
|
&entry->def.addrsel->list4) {
|
|
map4 = netlbl_domhsh_addr4_entry(iter4);
|
|
cipso_v4_doi_putdef(map4->def.cipso);
|
|
}
|
|
/* no need to check the IPv6 list since we currently
|
|
* support only unlabeled protocols for IPv6 */
|
|
break;
|
|
case NETLBL_NLTYPE_CIPSOV4:
|
|
cipso_v4_doi_putdef(entry->def.cipso);
|
|
break;
|
|
}
|
|
call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
|
|
}
|
|
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_remove_af4 - Removes an address selector entry
|
|
* @domain: the domain
|
|
* @addr: IPv4 address
|
|
* @mask: IPv4 address mask
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Removes an individual address selector from a domain mapping and potentially
|
|
* the entire mapping if it is empty. Returns zero on success, negative values
|
|
* on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_remove_af4(const char *domain,
|
|
const struct in_addr *addr,
|
|
const struct in_addr *mask,
|
|
struct netlbl_audit *audit_info)
|
|
{
|
|
struct netlbl_dom_map *entry_map;
|
|
struct netlbl_af4list *entry_addr;
|
|
struct netlbl_af4list *iter4;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct netlbl_af6list *iter6;
|
|
#endif /* IPv6 */
|
|
struct netlbl_domaddr4_map *entry;
|
|
|
|
rcu_read_lock();
|
|
|
|
if (domain)
|
|
entry_map = netlbl_domhsh_search(domain);
|
|
else
|
|
entry_map = netlbl_domhsh_search_def(domain);
|
|
if (entry_map == NULL ||
|
|
entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
|
|
goto remove_af4_failure;
|
|
|
|
spin_lock(&netlbl_domhsh_lock);
|
|
entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
|
|
&entry_map->def.addrsel->list4);
|
|
spin_unlock(&netlbl_domhsh_lock);
|
|
|
|
if (entry_addr == NULL)
|
|
goto remove_af4_failure;
|
|
netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
|
|
goto remove_af4_single_addr;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
|
|
goto remove_af4_single_addr;
|
|
#endif /* IPv6 */
|
|
/* the domain mapping is empty so remove it from the mapping table */
|
|
netlbl_domhsh_remove_entry(entry_map, audit_info);
|
|
|
|
remove_af4_single_addr:
|
|
rcu_read_unlock();
|
|
/* yick, we can't use call_rcu here because we don't have a rcu head
|
|
* pointer but hopefully this should be a rare case so the pause
|
|
* shouldn't be a problem */
|
|
synchronize_rcu();
|
|
entry = netlbl_domhsh_addr4_entry(entry_addr);
|
|
cipso_v4_doi_putdef(entry->def.cipso);
|
|
kfree(entry);
|
|
return 0;
|
|
|
|
remove_af4_failure:
|
|
rcu_read_unlock();
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_remove - Removes an entry from the domain hash table
|
|
* @domain: the domain to remove
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Removes an entry from the domain hash table and handles any updates to the
|
|
* lower level protocol handler (i.e. CIPSO). Returns zero on success,
|
|
* negative on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
|
|
{
|
|
int ret_val;
|
|
struct netlbl_dom_map *entry;
|
|
|
|
rcu_read_lock();
|
|
if (domain)
|
|
entry = netlbl_domhsh_search(domain);
|
|
else
|
|
entry = netlbl_domhsh_search_def(domain);
|
|
ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
|
|
rcu_read_unlock();
|
|
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_remove_default - Removes the default entry from the table
|
|
* @audit_info: NetLabel audit information
|
|
*
|
|
* Description:
|
|
* Removes/resets the default entry for the domain hash table and handles any
|
|
* updates to the lower level protocol handler (i.e. CIPSO). Returns zero on
|
|
* success, non-zero on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
|
|
{
|
|
return netlbl_domhsh_remove(NULL, audit_info);
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_getentry - Get an entry from the domain hash table
|
|
* @domain: the domain name to search for
|
|
*
|
|
* Description:
|
|
* Look through the domain hash table searching for an entry to match @domain,
|
|
* return a pointer to a copy of the entry or NULL. The caller is responsible
|
|
* for ensuring that rcu_read_[un]lock() is called.
|
|
*
|
|
*/
|
|
struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
|
|
{
|
|
return netlbl_domhsh_search_def(domain);
|
|
}
|
|
|
|
/**
|
|
* netlbl_domhsh_getentry_af4 - Get an entry from the domain hash table
|
|
* @domain: the domain name to search for
|
|
* @addr: the IP address to search for
|
|
*
|
|
* Description:
|
|
* Look through the domain hash table searching for an entry to match @domain
|
|
* and @addr, return a pointer to a copy of the entry or NULL. The caller is
|
|
* responsible for ensuring that rcu_read_[un]lock() is called.
|
|
*
|
|
*/
|
|
struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
|
|
__be32 addr)
|
|
{
|
|
struct netlbl_dom_map *dom_iter;
|
|
struct netlbl_af4list *addr_iter;
|
|
|
|
dom_iter = netlbl_domhsh_search_def(domain);
|
|
if (dom_iter == NULL)
|
|
return NULL;
|
|
|
|
if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
|
|
return &dom_iter->def;
|
|
addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4);
|
|
if (addr_iter == NULL)
|
|
return NULL;
|
|
return &(netlbl_domhsh_addr4_entry(addr_iter)->def);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/**
|
|
* netlbl_domhsh_getentry_af6 - Get an entry from the domain hash table
|
|
* @domain: the domain name to search for
|
|
* @addr: the IP address to search for
|
|
*
|
|
* Description:
|
|
* Look through the domain hash table searching for an entry to match @domain
|
|
* and @addr, return a pointer to a copy of the entry or NULL. The caller is
|
|
* responsible for ensuring that rcu_read_[un]lock() is called.
|
|
*
|
|
*/
|
|
struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
|
|
const struct in6_addr *addr)
|
|
{
|
|
struct netlbl_dom_map *dom_iter;
|
|
struct netlbl_af6list *addr_iter;
|
|
|
|
dom_iter = netlbl_domhsh_search_def(domain);
|
|
if (dom_iter == NULL)
|
|
return NULL;
|
|
|
|
if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
|
|
return &dom_iter->def;
|
|
addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6);
|
|
if (addr_iter == NULL)
|
|
return NULL;
|
|
return &(netlbl_domhsh_addr6_entry(addr_iter)->def);
|
|
}
|
|
#endif /* IPv6 */
|
|
|
|
/**
|
|
* netlbl_domhsh_walk - Iterate through the domain mapping hash table
|
|
* @skip_bkt: the number of buckets to skip at the start
|
|
* @skip_chain: the number of entries to skip in the first iterated bucket
|
|
* @callback: callback for each entry
|
|
* @cb_arg: argument for the callback function
|
|
*
|
|
* Description:
|
|
* Interate over the domain mapping hash table, skipping the first @skip_bkt
|
|
* buckets and @skip_chain entries. For each entry in the table call
|
|
* @callback, if @callback returns a negative value stop 'walking' through the
|
|
* table and return. Updates the values in @skip_bkt and @skip_chain on
|
|
* return. Returns zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
int netlbl_domhsh_walk(u32 *skip_bkt,
|
|
u32 *skip_chain,
|
|
int (*callback) (struct netlbl_dom_map *entry, void *arg),
|
|
void *cb_arg)
|
|
{
|
|
int ret_val = -ENOENT;
|
|
u32 iter_bkt;
|
|
struct list_head *iter_list;
|
|
struct netlbl_dom_map *iter_entry;
|
|
u32 chain_cnt = 0;
|
|
|
|
rcu_read_lock();
|
|
for (iter_bkt = *skip_bkt;
|
|
iter_bkt < rcu_dereference(netlbl_domhsh)->size;
|
|
iter_bkt++, chain_cnt = 0) {
|
|
iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
|
|
list_for_each_entry_rcu(iter_entry, iter_list, list)
|
|
if (iter_entry->valid) {
|
|
if (chain_cnt++ < *skip_chain)
|
|
continue;
|
|
ret_val = callback(iter_entry, cb_arg);
|
|
if (ret_val < 0) {
|
|
chain_cnt--;
|
|
goto walk_return;
|
|
}
|
|
}
|
|
}
|
|
|
|
walk_return:
|
|
rcu_read_unlock();
|
|
*skip_bkt = iter_bkt;
|
|
*skip_chain = chain_cnt;
|
|
return ret_val;
|
|
}
|