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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/ipv4/protocol.c
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 * INET protocol dispatch tables.
8 * Version: $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Alan Cox : Ahah! udp icmp errors don't work because
15 * udp_err is never called!
16 * Alan Cox : Added new fields for init and ready for
17 * proper fragmentation (_NO_ 4K limits!)
18 * Richard Colella : Hang on hash collision
19 * Vince Laviano : Modified inet_del_protocol() to correctly
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
28 #include <asm/uaccess.h>
29 #include <asm/system.h>
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/socket.h>
37 #include <linux/inet.h>
38 #include <linux/netdevice.h>
39 #include <linux/timer.h>
41 #include <net/protocol.h>
42 #include <linux/skbuff.h>
47 #include <linux/igmp.h>
49 struct net_protocol
*inet_protos
[MAX_INET_PROTOS
];
50 static DEFINE_SPINLOCK(inet_proto_lock
);
53 * Add a protocol handler to the hash tables
56 int inet_add_protocol(struct net_protocol
*prot
, unsigned char protocol
)
60 hash
= protocol
& (MAX_INET_PROTOS
- 1);
62 spin_lock_bh(&inet_proto_lock
);
63 if (inet_protos
[hash
]) {
66 inet_protos
[hash
] = prot
;
69 spin_unlock_bh(&inet_proto_lock
);
75 * Remove a protocol from the hash tables.
78 int inet_del_protocol(struct net_protocol
*prot
, unsigned char protocol
)
82 hash
= protocol
& (MAX_INET_PROTOS
- 1);
84 spin_lock_bh(&inet_proto_lock
);
85 if (inet_protos
[hash
] == prot
) {
86 inet_protos
[hash
] = NULL
;
91 spin_unlock_bh(&inet_proto_lock
);
98 EXPORT_SYMBOL(inet_add_protocol
);
99 EXPORT_SYMBOL(inet_del_protocol
);