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/net/ipv6/protocol.c

http://github.com/mirrors/linux
C | 70 lines | 40 code | 13 blank | 17 comment | 2 complexity | c8a59998e40067706de9959e46299df9 MD5 | raw file
 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 4 *		operating system.  INET is implemented using the  BSD Socket
 5 *		interface as the means of communication with the user level.
 6 *
 7 *		PF_INET6 protocol dispatch tables.
 8 *
 9 * Authors:	Pedro Roque	<roque@di.fc.ul.pt>
10 */
11
12/*
13 *      Changes:
14 *
15 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
16 *      - Removed unused variable 'inet6_protocol_base'
17 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
18 */
19#include <linux/module.h>
20#include <linux/netdevice.h>
21#include <linux/spinlock.h>
22#include <net/protocol.h>
23
24#if IS_ENABLED(CONFIG_IPV6)
25struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
26EXPORT_SYMBOL(inet6_protos);
27
28int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
29{
30	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
31			NULL, prot) ? 0 : -1;
32}
33EXPORT_SYMBOL(inet6_add_protocol);
34
35int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
36{
37	int ret;
38
39	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
40		       prot, NULL) == prot) ? 0 : -1;
41
42	synchronize_net();
43
44	return ret;
45}
46EXPORT_SYMBOL(inet6_del_protocol);
47#endif
48
49const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
50EXPORT_SYMBOL(inet6_offloads);
51
52int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
53{
54	return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
55			NULL, prot) ? 0 : -1;
56}
57EXPORT_SYMBOL(inet6_add_offload);
58
59int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
60{
61	int ret;
62
63	ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
64		       prot, NULL) == prot) ? 0 : -1;
65
66	synchronize_net();
67
68	return ret;
69}
70EXPORT_SYMBOL(inet6_del_offload);