linux/net/ipv6/protocol.c
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   1/*
   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.
   5 *
   6 *              PF_INET6 protocol dispatch tables.
   7 *
   8 * Authors:     Pedro Roque     <roque@di.fc.ul.pt>
   9 *
  10 *              This program is free software; you can redistribute it and/or
  11 *              modify it under the terms of the GNU General Public License
  12 *              as published by the Free Software Foundation; either version
  13 *              2 of the License, or (at your option) any later version.
  14 */
  15
  16/*
  17 *      Changes:
  18 *
  19 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
  20 *      - Removed unused variable 'inet6_protocol_base'
  21 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
  22 */
  23
  24#include <linux/errno.h>
  25#include <linux/types.h>
  26#include <linux/socket.h>
  27#include <linux/sockios.h>
  28#include <linux/net.h>
  29#include <linux/in6.h>
  30#include <linux/netdevice.h>
  31#include <linux/if_arp.h>
  32
  33#include <net/sock.h>
  34#include <net/snmp.h>
  35
  36#include <net/ipv6.h>
  37#include <net/protocol.h>
  38
  39struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
  40static DEFINE_SPINLOCK(inet6_proto_lock);
  41
  42
  43int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
  44{
  45        int ret, hash = protocol & (MAX_INET_PROTOS - 1);
  46
  47        spin_lock_bh(&inet6_proto_lock);
  48
  49        if (inet6_protos[hash]) {
  50                ret = -1;
  51        } else {
  52                inet6_protos[hash] = prot;
  53                ret = 0;
  54        }
  55
  56        spin_unlock_bh(&inet6_proto_lock);
  57
  58        return ret;
  59}
  60
  61EXPORT_SYMBOL(inet6_add_protocol);
  62
  63/*
  64 *      Remove a protocol from the hash tables.
  65 */
  66
  67int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
  68{
  69        int ret, hash = protocol & (MAX_INET_PROTOS - 1);
  70
  71        spin_lock_bh(&inet6_proto_lock);
  72
  73        if (inet6_protos[hash] != prot) {
  74                ret = -1;
  75        } else {
  76                inet6_protos[hash] = NULL;
  77                ret = 0;
  78        }
  79
  80        spin_unlock_bh(&inet6_proto_lock);
  81
  82        synchronize_net();
  83
  84        return ret;
  85}
  86
  87EXPORT_SYMBOL(inet6_del_protocol);
  88