// SPDX-License-Identifier: GPL-2.0-or-later/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		PF_INET6 protocol dispatch tables. * * Authors:	Pedro Roque	<roque@di.fc.ul.pt> */ /* *      Changes: * *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001 *      - Removed unused variable 'inet6_protocol_base' *      - Modified inet6_del_protocol() to correctly maintain copy bit. */#include <linux/module.h>#include <linux/netdevice.h>#include <linux/spinlock.h>#include <net/protocol.h> #if IS_ENABLED(CONFIG_IPV6)struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;EXPORT_SYMBOL(inet6_protos); int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol){	return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],			NULL, prot) ? 0 : -1;}EXPORT_SYMBOL(inet6_add_protocol); int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol){	int ret; 	ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],		       prot, NULL) == prot) ? 0 : -1; 	synchronize_net(); 	return ret;}EXPORT_SYMBOL(inet6_del_protocol);#endif const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;EXPORT_SYMBOL(inet6_offloads); int inet6_add_offload(const struct net_offload *prot, unsigned char protocol){	return !cmpxchg((const struct net_offload **)&inet6_offloads[protocol],			NULL, prot) ? 0 : -1;}EXPORT_SYMBOL(inet6_add_offload); int inet6_del_offload(const struct net_offload *prot, unsigned char protocol){	int ret; 	ret = (cmpxchg((const struct net_offload **)&inet6_offloads[protocol],		       prot, NULL) == prot) ? 0 : -1; 	synchronize_net(); 	return ret;}EXPORT_SYMBOL(inet6_del_offload);