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
28#if IS_ENABLED(CONFIG_IPV6)
29const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
30EXPORT_SYMBOL(inet6_protos);
31
32int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
33{
34	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
 
 
35			NULL, prot) ? 0 : -1;
36}
37EXPORT_SYMBOL(inet6_add_protocol);
38
 
 
 
 
39int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
40{
41	int ret;
42
43	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
44		       prot, NULL) == prot) ? 0 : -1;
45
46	synchronize_net();
47
48	return ret;
49}
50EXPORT_SYMBOL(inet6_del_protocol);
51#endif
52
53const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
54
55int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
56{
57	return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
58			NULL, prot) ? 0 : -1;
59}
60EXPORT_SYMBOL(inet6_add_offload);
61
62int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
63{
64	int ret;
65
66	ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
67		       prot, NULL) == prot) ? 0 : -1;
68
69	synchronize_net();
70
71	return ret;
72}
73EXPORT_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);