mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
f9242b6b28
Don't pretend that inet_protos[] and inet6_protos[] are hashes, thay are just a straight arrays. Remove all unnecessary hash masking. Document MAX_INET_PROTOS. Use RAW_HTABLE_SIZE when appropriate. Reported-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
59 lines
1.7 KiB
C
59 lines
1.7 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)
|
|
{
|
|
return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
|
|
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;
|
|
|
|
ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol],
|
|
prot, NULL) == prot) ? 0 : -1;
|
|
|
|
synchronize_net();
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(inet_del_protocol);
|