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);

 
 1/*
 2 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 3 *		operating system.  INET is implemented using the  BSD Socket
 4 *		interface as the means of communication with the user level.
 5 *
 6 *		PF_INET6 protocol dispatch tables.
 7 *
 8 * Authors:	Pedro Roque	<roque@di.fc.ul.pt>
 9 *
10 *		This program is free software; you can redistribute it and/or
11 *		modify it under the terms of the GNU General Public License
12 *		as published by the Free Software Foundation; either version
13 *		2 of the License, or (at your option) any later version.
14 */
15
16/*
17 *      Changes:
18 *
19 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
20 *      - Removed unused variable 'inet6_protocol_base'
21 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
22 */
23#include <linux/module.h>
24#include <linux/netdevice.h>
25#include <linux/spinlock.h>
26#include <net/protocol.h>
27
28const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
 
 
29
30int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
31{
32	int hash = protocol & (MAX_INET_PROTOS - 1);
33
34	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
35			NULL, prot) ? 0 : -1;
36}
37EXPORT_SYMBOL(inet6_add_protocol);
38
39/*
40 *	Remove a protocol from the hash tables.
41 */
42
43int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
44{
45	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
46
47	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
48		       prot, NULL) == prot) ? 0 : -1;
49
50	synchronize_net();
51
52	return ret;
53}
54EXPORT_SYMBOL(inet6_del_protocol);