kernel-ark/net/ipv6/protocol.c
Alexey Dobriyan 41135cc836 net: constify struct inet6_protocol
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-14 17:03:05 -07:00

77 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.
*
* PF_INET6 protocol dispatch tables.
*
* Authors: Pedro Roque <roque@di.fc.ul.pt>
*
* 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.
*/
/*
* Changes:
*
* Vince Laviano (vince@cs.stanford.edu) 16 May 2001
* - Removed unused variable 'inet6_protocol_base'
* - Modified inet6_del_protocol() to correctly maintain copy bit.
*/
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <net/protocol.h>
const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
static DEFINE_SPINLOCK(inet6_proto_lock);
int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
{
int ret, hash = protocol & (MAX_INET_PROTOS - 1);
spin_lock_bh(&inet6_proto_lock);
if (inet6_protos[hash]) {
ret = -1;
} else {
inet6_protos[hash] = prot;
ret = 0;
}
spin_unlock_bh(&inet6_proto_lock);
return ret;
}
EXPORT_SYMBOL(inet6_add_protocol);
/*
* Remove a protocol from the hash tables.
*/
int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
{
int ret, hash = protocol & (MAX_INET_PROTOS - 1);
spin_lock_bh(&inet6_proto_lock);
if (inet6_protos[hash] != prot) {
ret = -1;
} else {
inet6_protos[hash] = NULL;
ret = 0;
}
spin_unlock_bh(&inet6_proto_lock);
synchronize_net();
return ret;
}
EXPORT_SYMBOL(inet6_del_protocol);