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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 #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)
 29 const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
 30 EXPORT_SYMBOL(inet6_protos);
 31 
 32 int 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 }
 37 EXPORT_SYMBOL(inet6_add_protocol);
 38 
 39 int 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 }
 50 EXPORT_SYMBOL(inet6_del_protocol);
 51 #endif
 52 
 53 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
 54 EXPORT_SYMBOL(inet6_offloads);
 55 
 56 int 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 }
 61 EXPORT_SYMBOL(inet6_add_offload);
 62 
 63 int 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 }
 74 EXPORT_SYMBOL(inet6_del_offload);
 75 

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