Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[zen-stable.git] / net / ipv6 / protocol.c
blob9a7978fdc02a5de453feb7c4ca1ea9c1e7652292
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.
6 * PF_INET6 protocol dispatch tables.
8 * Authors: Pedro Roque <roque@di.fc.ul.pt>
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.
17 * Changes:
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.
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/spinlock.h>
26 #include <net/protocol.h>
28 const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
30 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
32 int hash = protocol & (MAX_INET_PROTOS - 1);
34 return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
35 NULL, prot) ? 0 : -1;
37 EXPORT_SYMBOL(inet6_add_protocol);
40 * Remove a protocol from the hash tables.
43 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
45 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
47 ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
48 prot, NULL) == prot) ? 0 : -1;
50 synchronize_net();
52 return ret;
54 EXPORT_SYMBOL(inet6_del_protocol);