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 * Version: $Id: protocol.c,v 1.10 2001/05/18 02:25:49 davem Exp $
9 *
10 * Authors: Pedro Roque <roque@di.fc.ul.pt>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18 /*
19 * Changes:
20 *
21 * Vince Laviano (vince@cs.stanford.edu) 16 May 2001
22 * - Removed unused variable 'inet6_protocol_base'
23 * - Modified inet6_del_protocol() to correctly maintain copy bit.
24 */
25
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/sockios.h>
30 #include <linux/net.h>
31 #include <linux/in6.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34
35 #include <net/sock.h>
36 #include <net/snmp.h>
37
38 #include <net/ipv6.h>
39 #include <net/protocol.h>
40
41 struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
42 static DEFINE_SPINLOCK(inet6_proto_lock);
43
44
45 int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
46 {
47 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
48
49 spin_lock_bh(&inet6_proto_lock);
50
51 if (inet6_protos[hash]) {
52 ret = -1;
53 } else {
54 inet6_protos[hash] = prot;
55 ret = 0;
56 }
57
58 spin_unlock_bh(&inet6_proto_lock);
59
60 return ret;
61 }
62
63 EXPORT_SYMBOL(inet6_add_protocol);
64
65 /*
66 * Remove a protocol from the hash tables.
67 */
68
69 int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
70 {
71 int ret, hash = protocol & (MAX_INET_PROTOS - 1);
72
73 spin_lock_bh(&inet6_proto_lock);
74
75 if (inet6_protos[hash] != prot) {
76 ret = -1;
77 } else {
78 inet6_protos[hash] = NULL;
79 ret = 0;
80 }
81
82 spin_unlock_bh(&inet6_proto_lock);
83
84 synchronize_net();
85
86 return ret;
87 }
88
89 EXPORT_SYMBOL(inet6_del_protocol);
90
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