1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * INET An implementation of the TCP/IP protocol suite for the LINUX
4*4882a593Smuzhiyun * operating system. INET is implemented using the BSD Socket
5*4882a593Smuzhiyun * interface as the means of communication with the user level.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * PF_INET6 protocol dispatch tables.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Authors: Pedro Roque <roque@di.fc.ul.pt>
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun /*
13*4882a593Smuzhiyun * Changes:
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
16*4882a593Smuzhiyun * - Removed unused variable 'inet6_protocol_base'
17*4882a593Smuzhiyun * - Modified inet6_del_protocol() to correctly maintain copy bit.
18*4882a593Smuzhiyun */
19*4882a593Smuzhiyun #include <linux/module.h>
20*4882a593Smuzhiyun #include <linux/netdevice.h>
21*4882a593Smuzhiyun #include <linux/spinlock.h>
22*4882a593Smuzhiyun #include <net/protocol.h>
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #if IS_ENABLED(CONFIG_IPV6)
25*4882a593Smuzhiyun struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
26*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_protos);
27*4882a593Smuzhiyun
inet6_add_protocol(const struct inet6_protocol * prot,unsigned char protocol)28*4882a593Smuzhiyun int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
31*4882a593Smuzhiyun NULL, prot) ? 0 : -1;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_add_protocol);
34*4882a593Smuzhiyun
inet6_del_protocol(const struct inet6_protocol * prot,unsigned char protocol)35*4882a593Smuzhiyun int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun int ret;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
40*4882a593Smuzhiyun prot, NULL) == prot) ? 0 : -1;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun synchronize_net();
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return ret;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_del_protocol);
47*4882a593Smuzhiyun #endif
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
50*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_offloads);
51*4882a593Smuzhiyun
inet6_add_offload(const struct net_offload * prot,unsigned char protocol)52*4882a593Smuzhiyun int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
55*4882a593Smuzhiyun NULL, prot) ? 0 : -1;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_add_offload);
58*4882a593Smuzhiyun
inet6_del_offload(const struct net_offload * prot,unsigned char protocol)59*4882a593Smuzhiyun int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun int ret;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
64*4882a593Smuzhiyun prot, NULL) == prot) ? 0 : -1;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun synchronize_net();
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun return ret;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun EXPORT_SYMBOL(inet6_del_offload);
71