Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Network node table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * SELinux must keep a mapping of network nodes to labels/SIDs.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * mapping is maintained as part of the normal policy but a fast cache is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * needed to reduce the lookup overhead since most of these queries happen on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * a per-packet basis.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Author: Paul Moore <paul@paul-moore.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * This code is heavily based on the "netif" concept originally developed by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * James Morris <jmorris@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *   (see security/selinux/netif.c for more information)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * (c) Copyright Hewlett-Packard Development Company, L.P., 2007
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/in6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include "netnode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include "objsec.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define SEL_NETNODE_HASH_SIZE       256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define SEL_NETNODE_HASH_BKT_LIMIT   16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) struct sel_netnode_bkt {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) struct sel_netnode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct netnode_security_struct nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) /* NOTE: we are using a combined hash table for both IPv4 and IPv6, the reason
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * for this is that I suspect most users will not make heavy use of both
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * address families at the same time so one table will usually end up wasted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * if this becomes a problem we can always add a hash table for each address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * family later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static LIST_HEAD(sel_netnode_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static DEFINE_SPINLOCK(sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static struct sel_netnode_bkt sel_netnode_hash[SEL_NETNODE_HASH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * sel_netnode_hashfn_ipv4 - IPv4 hashing function for the node table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @addr: IPv4 address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * This is the IPv4 hashing function for the node interface table, it returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * the bucket number for the given IP address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static unsigned int sel_netnode_hashfn_ipv4(__be32 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	/* at some point we should determine if the mismatch in byte order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	 * affects the hash function dramatically */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return (addr & (SEL_NETNODE_HASH_SIZE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * sel_netnode_hashfn_ipv6 - IPv6 hashing function for the node table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * @addr: IPv6 address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * This is the IPv6 hashing function for the node interface table, it returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * the bucket number for the given IP address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) static unsigned int sel_netnode_hashfn_ipv6(const struct in6_addr *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	/* just hash the least significant 32 bits to keep things fast (they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 * are the most likely to be different anyway), we can revisit this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 * later if needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	return (addr->s6_addr32[3] & (SEL_NETNODE_HASH_SIZE - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * sel_netnode_find - Search for a node record
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * @addr: IP address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  * @family: address family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * Search the network node table and return the record matching @addr.  If an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * entry can not be found in the table return NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	unsigned int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct sel_netnode *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	switch (family) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	case PF_INET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		idx = sel_netnode_hashfn_ipv4(*(__be32 *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	case PF_INET6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		idx = sel_netnode_hashfn_ipv6(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	list_for_each_entry_rcu(node, &sel_netnode_hash[idx].list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		if (node->nsec.family == family)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			switch (family) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			case PF_INET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 				if (node->nsec.addr.ipv4 == *(__be32 *)addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 					return node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			case PF_INET6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 				if (ipv6_addr_equal(&node->nsec.addr.ipv6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 						    addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 					return node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  * sel_netnode_insert - Insert a new node into the table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * @node: the new node record
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * Add a new node record to the network address hash table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static void sel_netnode_insert(struct sel_netnode *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	unsigned int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	switch (node->nsec.family) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	case PF_INET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		idx = sel_netnode_hashfn_ipv4(node->nsec.addr.ipv4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case PF_INET6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		idx = sel_netnode_hashfn_ipv6(&node->nsec.addr.ipv6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* we need to impose a limit on the growth of the hash table so check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	 * this bucket to make sure it is within the specified bounds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	list_add_rcu(&node->list, &sel_netnode_hash[idx].list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		struct sel_netnode *tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		tail = list_entry(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 						  lockdep_is_held(&sel_netnode_lock)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			struct sel_netnode, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		list_del_rcu(&tail->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		kfree_rcu(tail, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		sel_netnode_hash[idx].size++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * sel_netnode_sid_slow - Lookup the SID of a network address using the policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * @addr: the IP address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @family: the address family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * @sid: node SID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * This function determines the SID of a network address by querying the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * security policy.  The result is added to the network address table to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * speedup future queries.  Returns zero on success, negative values on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct sel_netnode *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct sel_netnode *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	spin_lock_bh(&sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	node = sel_netnode_find(addr, family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (node != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		*sid = node->nsec.sid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		spin_unlock_bh(&sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	new = kzalloc(sizeof(*new), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	switch (family) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	case PF_INET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		ret = security_node_sid(&selinux_state, PF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 					addr, sizeof(struct in_addr), sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			new->nsec.addr.ipv4 = *(__be32 *)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	case PF_INET6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		ret = security_node_sid(&selinux_state, PF_INET6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 					addr, sizeof(struct in6_addr), sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		if (new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			new->nsec.addr.ipv6 = *(struct in6_addr *)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (ret == 0 && new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		new->nsec.family = family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		new->nsec.sid = *sid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		sel_netnode_insert(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		kfree(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	spin_unlock_bh(&sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		pr_warn("SELinux: failure in %s(), unable to determine network node label\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			__func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  * sel_netnode_sid - Lookup the SID of a network address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  * @addr: the IP address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * @family: the address family
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  * @sid: node SID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * This function determines the SID of a network address using the fastest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * method possible.  First the address table is queried, but if an entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * can't be found then the policy is queried and the result is added to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  * table to speedup future queries.  Returns zero on success, negative values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int sel_netnode_sid(void *addr, u16 family, u32 *sid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	struct sel_netnode *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	node = sel_netnode_find(addr, family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (node != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		*sid = node->nsec.sid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return sel_netnode_sid_slow(addr, family, sid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)  * sel_netnode_flush - Flush the entire network address table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)  * Remove all entries from the network address table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) void sel_netnode_flush(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	unsigned int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct sel_netnode *node, *node_tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	spin_lock_bh(&sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	for (idx = 0; idx < SEL_NETNODE_HASH_SIZE; idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		list_for_each_entry_safe(node, node_tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 					 &sel_netnode_hash[idx].list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 				list_del_rcu(&node->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 				kfree_rcu(node, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		sel_netnode_hash[idx].size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	spin_unlock_bh(&sel_netnode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static __init int sel_netnode_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	int iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (!selinux_enabled_boot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	for (iter = 0; iter < SEL_NETNODE_HASH_SIZE; iter++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		INIT_LIST_HEAD(&sel_netnode_hash[iter].list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		sel_netnode_hash[iter].size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) __initcall(sel_netnode_init);