62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
|
/*
|
||
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
||
|
|
* operating system. INET is implemented using the BSD Socket
|
||
|
|
* interface as the means of communication with the user level.
|
||
|
|
*
|
||
|
|
* INET protocol dispatch tables.
|
||
|
|
*
|
||
|
|
* Authors: Ross Biro
|
||
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
||
|
|
*
|
||
|
|
* Fixes:
|
||
|
|
* Alan Cox : Ahah! udp icmp errors don't work because
|
||
|
|
* udp_err is never called!
|
||
|
|
* Alan Cox : Added new fields for init and ready for
|
||
|
|
* proper fragmentation (_NO_ 4K limits!)
|
||
|
|
* Richard Colella : Hang on hash collision
|
||
|
|
* Vince Laviano : Modified inet_del_protocol() to correctly
|
||
|
|
* maintain copy bit.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
#include <linux/cache.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/netdevice.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <net/protocol.h>
|
||
|
|
|
||
|
|
const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Add a protocol handler to the hash tables
|
||
|
|
*/
|
||
|
|
|
||
|
|
int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
|
||
|
|
{
|
||
|
|
int hash = protocol & (MAX_INET_PROTOS - 1);
|
||
|
|
|
||
|
|
return !cmpxchg((const struct net_protocol **)&inet_protos[hash],
|
||
|
|
NULL, prot) ? 0 : -1;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(inet_add_protocol);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Remove a protocol from the hash tables.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
|
||
|
|
{
|
||
|
|
int ret, hash = protocol & (MAX_INET_PROTOS - 1);
|
||
|
|
|
||
|
|
ret = (cmpxchg((const struct net_protocol **)&inet_protos[hash],
|
||
|
|
prot, NULL) == prot) ? 0 : -1;
|
||
|
|
|
||
|
|
synchronize_net();
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(inet_del_protocol);
|