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Linux/net/ipv6/protocol.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              PF_INET6 protocol dispatch tables.
  8  *
  9  * Authors:     Pedro Roque     <roque@di.fc.ul.pt>
 10  */
 11 
 12 /*
 13  *      Changes:
 14  *
 15  *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
 16  *      - Removed unused variable 'inet6_protocol_base'
 17  *      - Modified inet6_del_protocol() to correctly maintain copy bit.
 18  */
 19 #include <linux/module.h>
 20 #include <linux/netdevice.h>
 21 #include <linux/spinlock.h>
 22 #include <net/protocol.h>
 23 
 24 #if IS_ENABLED(CONFIG_IPV6)
 25 struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
 26 EXPORT_SYMBOL(inet6_protos);
 27 
 28 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 29 {
 30         return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
 31                         NULL, prot) ? 0 : -1;
 32 }
 33 EXPORT_SYMBOL(inet6_add_protocol);
 34 
 35 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 36 {
 37         int ret;
 38 
 39         ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
 40                        prot, NULL) == prot) ? 0 : -1;
 41 
 42         synchronize_net();
 43 
 44         return ret;
 45 }
 46 EXPORT_SYMBOL(inet6_del_protocol);
 47 #endif
 48 
 49 const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;
 50 EXPORT_SYMBOL(inet6_offloads);
 51 
 52 int inet6_add_offload(const struct net_offload *prot, unsigned char protocol)
 53 {
 54         return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
 55                         NULL, prot) ? 0 : -1;
 56 }
 57 EXPORT_SYMBOL(inet6_add_offload);
 58 
 59 int inet6_del_offload(const struct net_offload *prot, unsigned char protocol)
 60 {
 61         int ret;
 62 
 63         ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],
 64                        prot, NULL) == prot) ? 0 : -1;
 65 
 66         synchronize_net();
 67 
 68         return ret;
 69 }
 70 EXPORT_SYMBOL(inet6_del_offload);
 71 

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