LXR linux/net/ipv6/protocol.c

   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#include <linux/module.h>
  24#include <linux/netdevice.h>
  25#include <linux/spinlock.h>
  26#include <net/protocol.h>
  27
  28#if IS_ENABLED(CONFIG_IPV6)
  29const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
  30EXPORT_SYMBOL(inet6_protos);
  31
  32int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
  33{
  34        return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
  35                        NULL, prot) ? 0 : -1;
  36}
  37EXPORT_SYMBOL(inet6_add_protocol);
  38
  39int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
  40{
  41        int ret;
  42
  43        ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
  44                       prot, NULL) == prot) ? 0 : -1;
  45
  46        synchronize_net();
  47
  48        return ret;
  49}
  50EXPORT_SYMBOL(inet6_del_protocol);
  51#endif
  52
  53const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
  54EXPORT_SYMBOL(inet6_offloads);
  55
  56int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
  57{
  58        return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
  59                        NULL, prot) ? 0 : -1;
  60}
  61EXPORT_SYMBOL(inet6_add_offload);
  62
  63int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
  64{
  65        int ret;
  66
  67        ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
  68                       prot, NULL) == prot) ? 0 : -1;
  69
  70        synchronize_net();
  71
  72        return ret;
  73}
  74EXPORT_SYMBOL(inet6_del_offload);
  75