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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ipv4/] [protocol.c] - Blame information for rev 3

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Line No. Rev Author Line
1 3 xianfeng
/*
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 * INET         An implementation of the TCP/IP protocol suite for the LINUX
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 *              operating system.  INET is implemented using the  BSD Socket
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 *              interface as the means of communication with the user level.
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 *
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 *              INET protocol dispatch tables.
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 *
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 * Version:     $Id: protocol.c,v 1.14 2001/05/18 02:25:49 davem Exp $
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 *
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 * Authors:     Ross Biro
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 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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 *
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 * Fixes:
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 *              Alan Cox        : Ahah! udp icmp errors don't work because
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 *                                udp_err is never called!
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 *              Alan Cox        : Added new fields for init and ready for
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 *                                proper fragmentation (_NO_ 4K limits!)
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 *              Richard Colella : Hang on hash collision
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 *              Vince Laviano   : Modified inet_del_protocol() to correctly
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 *                                maintain copy bit.
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 *
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 *              This program is free software; you can redistribute it and/or
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 *              modify it under the terms of the GNU General Public License
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 *              as published by the Free Software Foundation; either version
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 *              2 of the License, or (at your option) any later version.
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 */
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/timer.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/ipip.h>
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#include <linux/igmp.h>
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struct net_protocol *inet_protos[MAX_INET_PROTOS] ____cacheline_aligned_in_smp;
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static DEFINE_SPINLOCK(inet_proto_lock);
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/*
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 *      Add a protocol handler to the hash tables
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 */
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int inet_add_protocol(struct net_protocol *prot, unsigned char protocol)
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{
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        int hash, ret;
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        hash = protocol & (MAX_INET_PROTOS - 1);
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        spin_lock_bh(&inet_proto_lock);
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        if (inet_protos[hash]) {
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                ret = -1;
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        } else {
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                inet_protos[hash] = prot;
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                ret = 0;
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        }
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        spin_unlock_bh(&inet_proto_lock);
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        return ret;
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}
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/*
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 *      Remove a protocol from the hash tables.
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 */
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int inet_del_protocol(struct net_protocol *prot, unsigned char protocol)
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{
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        int hash, ret;
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        hash = protocol & (MAX_INET_PROTOS - 1);
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        spin_lock_bh(&inet_proto_lock);
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        if (inet_protos[hash] == prot) {
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                inet_protos[hash] = NULL;
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                ret = 0;
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        } else {
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                ret = -1;
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        }
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        spin_unlock_bh(&inet_proto_lock);
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        synchronize_net();
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        return ret;
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}
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EXPORT_SYMBOL(inet_add_protocol);
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EXPORT_SYMBOL(inet_del_protocol);

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