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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 * INET protocol dispatch tables.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Alan Cox : Ahah! udp icmp errors don't work because
13 * udp_err is never called!
14 * Alan Cox : Added new fields for init and ready for
15 * proper fragmentation (_NO_ 4K limits!)
16 * Richard Colella : Hang on hash collision
17 * Vince Laviano : Modified inet_del_protocol() to correctly
18 * maintain copy bit.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25#include <linux/cache.h>
26#include <linux/module.h>
27#include <linux/netdevice.h>
28#include <linux/spinlock.h>
29#include <net/protocol.h>
30
31const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
32const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
33
34/*
35 * Add a protocol handler to the hash tables
36 */
37
38int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
39{
40 return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
41 NULL, prot) ? 0 : -1;
42}
43EXPORT_SYMBOL(inet_add_protocol);
44
45int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
46{
47 return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
48 NULL, prot) ? 0 : -1;
49}
50EXPORT_SYMBOL(inet_add_offload);
51
52/*
53 * Remove a protocol from the hash tables.
54 */
55
56int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
57{
58 int ret;
59
60 ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
61 prot, NULL) == prot) ? 0 : -1;
62
63 synchronize_net();
64
65 return ret;
66}
67EXPORT_SYMBOL(inet_del_protocol);
68
69int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
70{
71 int ret;
72
73 ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
74 prot, NULL) == prot) ? 0 : -1;
75
76 synchronize_net();
77
78 return ret;
79}
80EXPORT_SYMBOL(inet_del_offload);