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972 lines
27 KiB
972 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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 <[email protected]> |
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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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#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 <net/calipso.h> |
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#include <asm/bug.h> |
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|
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#include "netlabel_mgmt.h" |
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#include "netlabel_addrlist.h" |
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#include "netlabel_calipso.h" |
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#include "netlabel_domainhash.h" |
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#include "netlabel_user.h" |
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|
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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 __rcu *netlbl_domhsh; |
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static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv4; |
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static struct netlbl_dom_map __rcu *netlbl_domhsh_def_ipv6; |
|
|
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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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kfree(ptr->def.addrsel); |
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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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* @key: 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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static bool netlbl_family_match(u16 f1, u16 f2) |
|
{ |
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return (f1 == f2) || (f1 == AF_UNSPEC) || (f2 == AF_UNSPEC); |
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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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* @family: the address family |
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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. @family may be %AF_UNSPEC |
|
* which matches any address family entries. The caller is responsible for |
|
* 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, |
|
u16 family) |
|
{ |
|
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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lockdep_is_held(&netlbl_domhsh_lock)) |
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if (iter->valid && |
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netlbl_family_match(iter->family, family) && |
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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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* @family: the address family |
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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 |
|
* returned. @family may be %AF_UNSPEC which matches any address family |
|
* entries. 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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static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain, |
|
u16 family) |
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{ |
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struct netlbl_dom_map *entry; |
|
|
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entry = netlbl_domhsh_search(domain, family); |
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if (entry != NULL) |
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return entry; |
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if (family == AF_INET || family == AF_UNSPEC) { |
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entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv4); |
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if (entry != NULL && entry->valid) |
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return entry; |
|
} |
|
if (family == AF_INET6 || family == AF_UNSPEC) { |
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entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def_ipv6); |
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if (entry != NULL && entry->valid) |
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return entry; |
|
} |
|
|
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return NULL; |
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} |
|
|
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/** |
|
* netlbl_domhsh_audit_add - Generate an audit entry for an add event |
|
* @entry: the entry being added |
|
* @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: |
|
* 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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static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry, |
|
struct netlbl_af4list *addr4, |
|
struct netlbl_af6list *addr6, |
|
int result, |
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struct netlbl_audit *audit_info) |
|
{ |
|
struct audit_buffer *audit_buf; |
|
struct cipso_v4_doi *cipsov4 = NULL; |
|
struct calipso_doi *calipso = NULL; |
|
u32 type; |
|
|
|
audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info); |
|
if (audit_buf != NULL) { |
|
audit_log_format(audit_buf, " nlbl_domain=%s", |
|
entry->domain ? entry->domain : "(default)"); |
|
if (addr4 != NULL) { |
|
struct netlbl_domaddr4_map *map4; |
|
map4 = netlbl_domhsh_addr4_entry(addr4); |
|
type = map4->def.type; |
|
cipsov4 = map4->def.cipso; |
|
netlbl_af4list_audit_addr(audit_buf, 0, NULL, |
|
addr4->addr, addr4->mask); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (addr6 != NULL) { |
|
struct netlbl_domaddr6_map *map6; |
|
map6 = netlbl_domhsh_addr6_entry(addr6); |
|
type = map6->def.type; |
|
calipso = map6->def.calipso; |
|
netlbl_af6list_audit_addr(audit_buf, 0, NULL, |
|
&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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calipso = entry->def.calipso; |
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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"); |
|
break; |
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case NETLBL_NLTYPE_CIPSOV4: |
|
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; |
|
case NETLBL_NLTYPE_CALIPSO: |
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BUG_ON(calipso == NULL); |
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audit_log_format(audit_buf, |
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" nlbl_protocol=calipso calipso_doi=%u", |
|
calipso->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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* netlbl_domhsh_validate - Validate a new domain mapping entry |
|
* @entry: the entry to validate |
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* |
|
* This function validates the new domain mapping entry to ensure that it is |
|
* a valid entry. Returns zero on success, negative values on failure. |
|
* |
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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; |
|
#endif /* IPv6 */ |
|
|
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if (entry == NULL) |
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return -EINVAL; |
|
|
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if (entry->family != AF_INET && entry->family != AF_INET6 && |
|
(entry->family != AF_UNSPEC || |
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entry->def.type != NETLBL_NLTYPE_UNLABELED)) |
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return -EINVAL; |
|
|
|
switch (entry->def.type) { |
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case NETLBL_NLTYPE_UNLABELED: |
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if (entry->def.cipso != NULL || entry->def.calipso != NULL || |
|
entry->def.addrsel != NULL) |
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return -EINVAL; |
|
break; |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
if (entry->family != AF_INET || |
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entry->def.cipso == NULL) |
|
return -EINVAL; |
|
break; |
|
case NETLBL_NLTYPE_CALIPSO: |
|
if (entry->family != AF_INET6 || |
|
entry->def.calipso == NULL) |
|
return -EINVAL; |
|
break; |
|
case NETLBL_NLTYPE_ADDRSELECT: |
|
netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) { |
|
map4 = netlbl_domhsh_addr4_entry(iter4); |
|
switch (map4->def.type) { |
|
case NETLBL_NLTYPE_UNLABELED: |
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if (map4->def.cipso != NULL) |
|
return -EINVAL; |
|
break; |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
if (map4->def.cipso == NULL) |
|
return -EINVAL; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) { |
|
map6 = netlbl_domhsh_addr6_entry(iter6); |
|
switch (map6->def.type) { |
|
case NETLBL_NLTYPE_UNLABELED: |
|
if (map6->def.calipso != NULL) |
|
return -EINVAL; |
|
break; |
|
case NETLBL_NLTYPE_CALIPSO: |
|
if (map6->def.calipso == NULL) |
|
return -EINVAL; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
#endif /* IPv6 */ |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Domain Hash Table Functions |
|
*/ |
|
|
|
/** |
|
* netlbl_domhsh_init - Init for the domain hash |
|
* @size: the number of bits to use for the hash buckets |
|
* |
|
* Description: |
|
* Initializes the domain hash table, should be called only by |
|
* netlbl_user_init() during initialization. Returns zero on success, non-zero |
|
* values on error. |
|
* |
|
*/ |
|
int __init netlbl_domhsh_init(u32 size) |
|
{ |
|
u32 iter; |
|
struct netlbl_domhsh_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_domhsh_lock); |
|
rcu_assign_pointer(netlbl_domhsh, hsh_tbl); |
|
spin_unlock(&netlbl_domhsh_lock); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* netlbl_domhsh_add - Adds a entry to the domain hash table |
|
* @entry: the entry to add |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Adds a new entry to the domain hash table and handles any updates to the |
|
* lower level protocol handler (i.e. CIPSO). @entry->family may be set to |
|
* %AF_UNSPEC which will add an entry that matches all address families. This |
|
* is only useful for the unlabelled type and will only succeed if there is no |
|
* existing entry for any address family with the same domain. Returns zero |
|
* on success, negative on failure. |
|
* |
|
*/ |
|
int netlbl_domhsh_add(struct netlbl_dom_map *entry, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
int ret_val = 0; |
|
struct netlbl_dom_map *entry_old, *entry_b; |
|
struct netlbl_af4list *iter4; |
|
struct netlbl_af4list *tmp4; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct netlbl_af6list *iter6; |
|
struct netlbl_af6list *tmp6; |
|
#endif /* IPv6 */ |
|
|
|
ret_val = netlbl_domhsh_validate(entry); |
|
if (ret_val != 0) |
|
return ret_val; |
|
|
|
/* XXX - we can remove this RCU read lock as the spinlock protects the |
|
* entire function, but before we do we need to fixup the |
|
* netlbl_af[4,6]list RCU functions to do "the right thing" with |
|
* respect to rcu_dereference() when only a spinlock is held. */ |
|
rcu_read_lock(); |
|
spin_lock(&netlbl_domhsh_lock); |
|
if (entry->domain != NULL) |
|
entry_old = netlbl_domhsh_search(entry->domain, entry->family); |
|
else |
|
entry_old = netlbl_domhsh_search_def(entry->domain, |
|
entry->family); |
|
if (entry_old == NULL) { |
|
entry->valid = 1; |
|
|
|
if (entry->domain != NULL) { |
|
u32 bkt = netlbl_domhsh_hash(entry->domain); |
|
list_add_tail_rcu(&entry->list, |
|
&rcu_dereference(netlbl_domhsh)->tbl[bkt]); |
|
} else { |
|
INIT_LIST_HEAD(&entry->list); |
|
switch (entry->family) { |
|
case AF_INET: |
|
rcu_assign_pointer(netlbl_domhsh_def_ipv4, |
|
entry); |
|
break; |
|
case AF_INET6: |
|
rcu_assign_pointer(netlbl_domhsh_def_ipv6, |
|
entry); |
|
break; |
|
case AF_UNSPEC: |
|
if (entry->def.type != |
|
NETLBL_NLTYPE_UNLABELED) { |
|
ret_val = -EINVAL; |
|
goto add_return; |
|
} |
|
entry_b = kzalloc(sizeof(*entry_b), GFP_ATOMIC); |
|
if (entry_b == NULL) { |
|
ret_val = -ENOMEM; |
|
goto add_return; |
|
} |
|
entry_b->family = AF_INET6; |
|
entry_b->def.type = NETLBL_NLTYPE_UNLABELED; |
|
entry_b->valid = 1; |
|
entry->family = AF_INET; |
|
rcu_assign_pointer(netlbl_domhsh_def_ipv4, |
|
entry); |
|
rcu_assign_pointer(netlbl_domhsh_def_ipv6, |
|
entry_b); |
|
break; |
|
default: |
|
/* Already checked in |
|
* netlbl_domhsh_validate(). */ |
|
ret_val = -EINVAL; |
|
goto add_return; |
|
} |
|
} |
|
|
|
if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
|
netlbl_af4list_foreach_rcu(iter4, |
|
&entry->def.addrsel->list4) |
|
netlbl_domhsh_audit_add(entry, iter4, NULL, |
|
ret_val, audit_info); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach_rcu(iter6, |
|
&entry->def.addrsel->list6) |
|
netlbl_domhsh_audit_add(entry, NULL, iter6, |
|
ret_val, audit_info); |
|
#endif /* IPv6 */ |
|
} else |
|
netlbl_domhsh_audit_add(entry, NULL, NULL, |
|
ret_val, audit_info); |
|
} else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT && |
|
entry->def.type == NETLBL_NLTYPE_ADDRSELECT) { |
|
struct list_head *old_list4; |
|
struct list_head *old_list6; |
|
|
|
old_list4 = &entry_old->def.addrsel->list4; |
|
old_list6 = &entry_old->def.addrsel->list6; |
|
|
|
/* we only allow the addition of address selectors if all of |
|
* the selectors do not exist in the existing domain map */ |
|
netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4) |
|
if (netlbl_af4list_search_exact(iter4->addr, |
|
iter4->mask, |
|
old_list4)) { |
|
ret_val = -EEXIST; |
|
goto add_return; |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) |
|
if (netlbl_af6list_search_exact(&iter6->addr, |
|
&iter6->mask, |
|
old_list6)) { |
|
ret_val = -EEXIST; |
|
goto add_return; |
|
} |
|
#endif /* IPv6 */ |
|
|
|
netlbl_af4list_foreach_safe(iter4, tmp4, |
|
&entry->def.addrsel->list4) { |
|
netlbl_af4list_remove_entry(iter4); |
|
iter4->valid = 1; |
|
ret_val = netlbl_af4list_add(iter4, old_list4); |
|
netlbl_domhsh_audit_add(entry_old, iter4, NULL, |
|
ret_val, audit_info); |
|
if (ret_val != 0) |
|
goto add_return; |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach_safe(iter6, tmp6, |
|
&entry->def.addrsel->list6) { |
|
netlbl_af6list_remove_entry(iter6); |
|
iter6->valid = 1; |
|
ret_val = netlbl_af6list_add(iter6, old_list6); |
|
netlbl_domhsh_audit_add(entry_old, NULL, iter6, |
|
ret_val, audit_info); |
|
if (ret_val != 0) |
|
goto add_return; |
|
} |
|
#endif /* IPv6 */ |
|
/* cleanup the new entry since we've moved everything over */ |
|
netlbl_domhsh_free_entry(&entry->rcu); |
|
} else |
|
ret_val = -EINVAL; |
|
|
|
add_return: |
|
spin_unlock(&netlbl_domhsh_lock); |
|
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; |
|
struct netlbl_af4list *iter4; |
|
struct netlbl_domaddr4_map *map4; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct netlbl_af6list *iter6; |
|
struct netlbl_domaddr6_map *map6; |
|
#endif /* IPv6 */ |
|
|
|
if (entry == NULL) |
|
return -ENOENT; |
|
|
|
spin_lock(&netlbl_domhsh_lock); |
|
if (entry->valid) { |
|
entry->valid = 0; |
|
if (entry == rcu_dereference(netlbl_domhsh_def_ipv4)) |
|
RCU_INIT_POINTER(netlbl_domhsh_def_ipv4, NULL); |
|
else if (entry == rcu_dereference(netlbl_domhsh_def_ipv6)) |
|
RCU_INIT_POINTER(netlbl_domhsh_def_ipv6, NULL); |
|
else |
|
list_del_rcu(&entry->list); |
|
} else |
|
ret_val = -ENOENT; |
|
spin_unlock(&netlbl_domhsh_lock); |
|
|
|
if (ret_val) |
|
return ret_val; |
|
|
|
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=1", |
|
entry->domain ? entry->domain : "(default)"); |
|
audit_log_end(audit_buf); |
|
} |
|
|
|
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); |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6) { |
|
map6 = netlbl_domhsh_addr6_entry(iter6); |
|
calipso_doi_putdef(map6->def.calipso); |
|
} |
|
#endif /* IPv6 */ |
|
break; |
|
case NETLBL_NLTYPE_CIPSOV4: |
|
cipso_v4_doi_putdef(entry->def.cipso); |
|
break; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case NETLBL_NLTYPE_CALIPSO: |
|
calipso_doi_putdef(entry->def.calipso); |
|
break; |
|
#endif /* IPv6 */ |
|
} |
|
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, AF_INET); |
|
else |
|
entry_map = netlbl_domhsh_search_def(domain, AF_INET); |
|
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; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
/** |
|
* netlbl_domhsh_remove_af6 - Removes an address selector entry |
|
* @domain: the domain |
|
* @addr: IPv6 address |
|
* @mask: IPv6 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_af6(const char *domain, |
|
const struct in6_addr *addr, |
|
const struct in6_addr *mask, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
struct netlbl_dom_map *entry_map; |
|
struct netlbl_af6list *entry_addr; |
|
struct netlbl_af4list *iter4; |
|
struct netlbl_af6list *iter6; |
|
struct netlbl_domaddr6_map *entry; |
|
|
|
rcu_read_lock(); |
|
|
|
if (domain) |
|
entry_map = netlbl_domhsh_search(domain, AF_INET6); |
|
else |
|
entry_map = netlbl_domhsh_search_def(domain, AF_INET6); |
|
if (entry_map == NULL || |
|
entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT) |
|
goto remove_af6_failure; |
|
|
|
spin_lock(&netlbl_domhsh_lock); |
|
entry_addr = netlbl_af6list_remove(addr, mask, |
|
&entry_map->def.addrsel->list6); |
|
spin_unlock(&netlbl_domhsh_lock); |
|
|
|
if (entry_addr == NULL) |
|
goto remove_af6_failure; |
|
netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4) |
|
goto remove_af6_single_addr; |
|
netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6) |
|
goto remove_af6_single_addr; |
|
/* the domain mapping is empty so remove it from the mapping table */ |
|
netlbl_domhsh_remove_entry(entry_map, audit_info); |
|
|
|
remove_af6_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_addr6_entry(entry_addr); |
|
calipso_doi_putdef(entry->def.calipso); |
|
kfree(entry); |
|
return 0; |
|
|
|
remove_af6_failure: |
|
rcu_read_unlock(); |
|
return -ENOENT; |
|
} |
|
#endif /* IPv6 */ |
|
|
|
/** |
|
* netlbl_domhsh_remove - Removes an entry from the domain hash table |
|
* @domain: the domain to remove |
|
* @family: address family |
|
* @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). @family may be %AF_UNSPEC which |
|
* removes all address family entries. Returns zero on success, negative on |
|
* failure. |
|
* |
|
*/ |
|
int netlbl_domhsh_remove(const char *domain, u16 family, |
|
struct netlbl_audit *audit_info) |
|
{ |
|
int ret_val = -EINVAL; |
|
struct netlbl_dom_map *entry; |
|
|
|
rcu_read_lock(); |
|
|
|
if (family == AF_INET || family == AF_UNSPEC) { |
|
if (domain) |
|
entry = netlbl_domhsh_search(domain, AF_INET); |
|
else |
|
entry = netlbl_domhsh_search_def(domain, AF_INET); |
|
ret_val = netlbl_domhsh_remove_entry(entry, audit_info); |
|
if (ret_val && ret_val != -ENOENT) |
|
goto done; |
|
} |
|
if (family == AF_INET6 || family == AF_UNSPEC) { |
|
int ret_val2; |
|
|
|
if (domain) |
|
entry = netlbl_domhsh_search(domain, AF_INET6); |
|
else |
|
entry = netlbl_domhsh_search_def(domain, AF_INET6); |
|
ret_val2 = netlbl_domhsh_remove_entry(entry, audit_info); |
|
if (ret_val2 != -ENOENT) |
|
ret_val = ret_val2; |
|
} |
|
done: |
|
rcu_read_unlock(); |
|
|
|
return ret_val; |
|
} |
|
|
|
/** |
|
* netlbl_domhsh_remove_default - Removes the default entry from the table |
|
* @family: address family |
|
* @audit_info: NetLabel audit information |
|
* |
|
* Description: |
|
* Removes/resets the default entry corresponding to @family from the domain |
|
* hash table and handles any updates to the lower level protocol handler |
|
* (i.e. CIPSO). @family may be %AF_UNSPEC which removes all address family |
|
* entries. Returns zero on success, negative on failure. |
|
* |
|
*/ |
|
int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info) |
|
{ |
|
return netlbl_domhsh_remove(NULL, family, audit_info); |
|
} |
|
|
|
/** |
|
* netlbl_domhsh_getentry - Get an entry from the domain hash table |
|
* @domain: the domain name to search for |
|
* @family: address family |
|
* |
|
* Description: |
|
* Look through the domain hash table searching for an entry to match @domain, |
|
* with address family @family, 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, u16 family) |
|
{ |
|
if (family == AF_UNSPEC) |
|
return NULL; |
|
return netlbl_domhsh_search_def(domain, family); |
|
} |
|
|
|
/** |
|
* 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, AF_INET); |
|
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, AF_INET6); |
|
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: |
|
* Iterate 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; |
|
}
|
|
|