include/linux/ipv6.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _IPV6_H
 #define _IPV6_H

 #include <uapi/linux/ipv6.h>

 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
 /*
  * This structure contains configuration options per IPv6 link.
  */
 struct ipv6_devconf {
 	__s32		forwarding;
 	__s32		hop_limit;
 	__s32		mtu6;
 	__s32		accept_ra;
 	__s32		accept_redirects;
 	__s32		autoconf;
 	__s32		dad_transmits;
 	__s32		rtr_solicits;
 	__s32		rtr_solicit_interval;
 	__s32		rtr_solicit_max_interval;
 	__s32		rtr_solicit_delay;
 	__s32		force_mld_version;
 	__s32		mldv1_unsolicited_report_interval;
 	__s32		mldv2_unsolicited_report_interval;
 	__s32		use_tempaddr;
 	__s32		temp_valid_lft;
 	__s32		temp_prefered_lft;
 	__s32		regen_max_retry;
 	__s32		max_desync_factor;
 	__s32		max_addresses;
 	__s32		accept_ra_defrtr;
 	__u32		ra_defrtr_metric;
 	__s32		accept_ra_min_hop_limit;
 	__s32		accept_ra_pinfo;
 	__s32		ignore_routes_with_linkdown;
 #ifdef CONFIG_IPV6_ROUTER_PREF
 	__s32		accept_ra_rtr_pref;
 	__s32		rtr_probe_interval;
 #ifdef CONFIG_IPV6_ROUTE_INFO
 	__s32		accept_ra_rt_info_min_plen;
 	__s32		accept_ra_rt_info_max_plen;
 #endif
 #endif
 	__s32		proxy_ndp;
 	__s32		accept_source_route;
 	__s32		accept_ra_from_local;
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 	__s32		optimistic_dad;
 	__s32		use_optimistic;
 #endif
 #ifdef CONFIG_IPV6_MROUTE
 	atomic_t	mc_forwarding;
 #endif
 	__s32		disable_ipv6;
 	__s32		drop_unicast_in_l2_multicast;
 	__s32		accept_dad;
 	__s32		force_tllao;
 	__s32           ndisc_notify;
 	__s32		suppress_frag_ndisc;
 	__s32		accept_ra_mtu;
 	__s32		drop_unsolicited_na;
 	struct ipv6_stable_secret {
 		bool initialized;
 		struct in6_addr secret;
 	} stable_secret;
 	__s32		use_oif_addrs_only;
 	__s32		keep_addr_on_down;
 	__s32		seg6_enabled;
 #ifdef CONFIG_IPV6_SEG6_HMAC
 	__s32		seg6_require_hmac;
 #endif
 	__u32		enhanced_dad;
 	__u32		addr_gen_mode;
 	__s32		disable_policy;
 	__s32           ndisc_tclass;
 	__s32		rpl_seg_enabled;
 	__u32		ioam6_id;
 	__u32		ioam6_id_wide;
 	__u8		ioam6_enabled;
 	__u8		ndisc_evict_nocarrier;

 	struct ctl_table_header *sysctl_header;
 };

 struct ipv6_params {
 	__s32 disable_ipv6;
 	__s32 autoconf;
 };
 extern struct ipv6_params ipv6_defaults;
 #include <linux/tcp.h>
 #include <linux/udp.h>

 #include <net/inet_sock.h>

 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 {
 	return (struct ipv6hdr *)skb_network_header(skb);
 }

 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
 {
 	return (struct ipv6hdr *)skb_inner_network_header(skb);
 }

 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 {
 	return (struct ipv6hdr *)skb_transport_header(skb);
 }

 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
 {
 	return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
 	       skb_network_header_len(skb);
 }

 /*
    This structure contains results of exthdrs parsing
    as offsets from skb->nh.
  */

 struct inet6_skb_parm {
 	int			iif;
 	__be16			ra;
 	__u16			dst0;
 	__u16			srcrt;
 	__u16			dst1;
 	__u16			lastopt;
 	__u16			nhoff;
 	__u16			flags;
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 	__u16			dsthao;
 #endif
 	__u16			frag_max_size;
 	__u16			srhoff;

 #define IP6SKB_XFRM_TRANSFORMED	1
 #define IP6SKB_FORWARDED	2
 #define IP6SKB_REROUTED		4
 #define IP6SKB_ROUTERALERT	8
 #define IP6SKB_FRAGMENTED      16
 #define IP6SKB_HOPBYHOP        32
 #define IP6SKB_L3SLAVE         64
 #define IP6SKB_JUMBOGRAM      128
 #define IP6SKB_SEG6	      256
 };

 #if defined(CONFIG_NET_L3_MASTER_DEV)
 static inline bool ipv6_l3mdev_skb(__u16 flags)
 {
 	return flags & IP6SKB_L3SLAVE;
 }
 #else
 static inline bool ipv6_l3mdev_skb(__u16 flags)
 {
 	return false;
 }
 #endif

 #define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))
 #define IP6CBMTU(skb)	((struct ip6_mtuinfo *)((skb)->cb))

 static inline int inet6_iif(const struct sk_buff *skb)
 {
 	bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);

 	return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
 }

 static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
 {
 	return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
 }

 /* can not be used in TCP layer after tcp_v6_fill_cb */
 static inline int inet6_sdif(const struct sk_buff *skb)
 {
 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 	if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
 		return IP6CB(skb)->iif;
 #endif
 	return 0;
 }

 struct tcp6_request_sock {
 	struct tcp_request_sock	  tcp6rsk_tcp;
 };

 struct ipv6_mc_socklist;
 struct ipv6_ac_socklist;
 struct ipv6_fl_socklist;

 struct inet6_cork {
 	struct ipv6_txoptions *opt;
 	u8 hop_limit;
 	u8 tclass;
 };

 /**
  * struct ipv6_pinfo - ipv6 private area
  *
  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
  * this _must_ be the last member, so that inet6_sk_generic
  * is able to calculate its offset from the base struct sock
  * by using the struct proto->slab_obj_size member. -acme
  */
 struct ipv6_pinfo {
 	struct in6_addr 	saddr;
 	struct in6_pktinfo	sticky_pktinfo;
 	const struct in6_addr		*daddr_cache;
 #ifdef CONFIG_IPV6_SUBTREES
 	const struct in6_addr		*saddr_cache;
 #endif

 	__be32			flow_label;
 	__u32			frag_size;

 	/*
 	 * Packed in 16bits.
 	 * Omit one shift by putting the signed field at MSB.
 	 */
 #if defined(__BIG_ENDIAN_BITFIELD)
 	__s16			hop_limit:9;
 	__u16			__unused_1:7;
 #else
 	__u16			__unused_1:7;
 	__s16			hop_limit:9;
 #endif

 #if defined(__BIG_ENDIAN_BITFIELD)
 	/* Packed in 16bits. */
 	__s16			mcast_hops:9;
 	__u16			__unused_2:6,
 				mc_loop:1;
 #else
 	__u16			mc_loop:1,
 				__unused_2:6;
 	__s16			mcast_hops:9;
 #endif
 	int			ucast_oif;
 	int			mcast_oif;

 	/* pktoption flags */
 	union {
 		struct {
 			__u16	srcrt:1,
 				osrcrt:1,
 			        rxinfo:1,
 			        rxoinfo:1,
 				rxhlim:1,
 				rxohlim:1,
 				hopopts:1,
 				ohopopts:1,
 				dstopts:1,
 				odstopts:1,
                                 rxflow:1,
 				rxtclass:1,
 				rxpmtu:1,
 				rxorigdstaddr:1,
 				recvfragsize:1;
 				/* 1 bits hole */
 		} bits;
 		__u16		all;
 	} rxopt;

 	/* sockopt flags */
 	__u16			recverr:1,
 	                        sndflow:1,
 				repflow:1,
 				pmtudisc:3,
 				padding:1,	/* 1 bit hole */
 				srcprefs:3,	/* 001: prefer temporary address
 						 * 010: prefer public address
 						 * 100: prefer care-of address
 						 */
 				dontfrag:1,
 				autoflowlabel:1,
 				autoflowlabel_set:1,
 				mc_all:1,
 				recverr_rfc4884:1,
 				rtalert_isolate:1;
 	__u8			min_hopcount;
 	__u8			tclass;
 	__be32			rcv_flowinfo;

 	__u32			dst_cookie;

 	struct ipv6_mc_socklist	__rcu *ipv6_mc_list;
 	struct ipv6_ac_socklist	*ipv6_ac_list;
 	struct ipv6_fl_socklist __rcu *ipv6_fl_list;

 	struct ipv6_txoptions __rcu	*opt;
 	struct sk_buff		*pktoptions;
 	struct sk_buff		*rxpmtu;
 	struct inet6_cork	cork;
 };

 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 struct raw6_sock {
 	/* inet_sock has to be the first member of raw6_sock */
 	struct inet_sock	inet;
 	__u32			checksum;	/* perform checksum */
 	__u32			offset;		/* checksum offset  */
 	struct icmp6_filter	filter;
 	__u32			ip6mr_table;
 	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 	struct ipv6_pinfo	inet6;
 };

 struct udp6_sock {
 	struct udp_sock	  udp;
 	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 	struct ipv6_pinfo inet6;
 };

 struct tcp6_sock {
 	struct tcp_sock	  tcp;
 	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 	struct ipv6_pinfo inet6;
 };

 extern int inet6_sk_rebuild_header(struct sock *sk);

 struct tcp6_timewait_sock {
 	struct tcp_timewait_sock   tcp6tw_tcp;
 };

 #if IS_ENABLED(CONFIG_IPV6)
 bool ipv6_mod_enabled(void);

 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 {
 	return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 }

 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return (struct raw6_sock *)sk;
 }

 #define __ipv6_only_sock(sk)	(sk->sk_ipv6only)
 #define ipv6_only_sock(sk)	(__ipv6_only_sock(sk))
 #define ipv6_sk_rxinfo(sk)	((sk)->sk_family == PF_INET6 && \
 				 inet6_sk(sk)->rxopt.bits.rxinfo)

 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 {
 	if (sk->sk_family == AF_INET6)
 		return &sk->sk_v6_rcv_saddr;
 	return NULL;
 }

 static inline int inet_v6_ipv6only(const struct sock *sk)
 {
 	/* ipv6only field is at same position for timewait and other sockets */
 	return ipv6_only_sock(sk);
 }
 #else
 #define __ipv6_only_sock(sk)	0
 #define ipv6_only_sock(sk)	0
 #define ipv6_sk_rxinfo(sk)	0

 static inline bool ipv6_mod_enabled(void)
 {
 	return false;
 }

 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 {
 	return NULL;
 }

 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return NULL;
 }

 #define inet6_rcv_saddr(__sk)	NULL
 #define inet_v6_ipv6only(__sk)		0
 #endif /* IS_ENABLED(CONFIG_IPV6) */
 #endif /* _IPV6_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _IPV6_H
	#define _IPV6_H

	#include <uapi/linux/ipv6.h>

	#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
	#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
	/*
	* This structure contains configuration options per IPv6 link.
	*/
	struct ipv6_devconf {
	__s32 forwarding;
	__s32 hop_limit;
	__s32 mtu6;
	__s32 accept_ra;
	__s32 accept_redirects;
	__s32 autoconf;
	__s32 dad_transmits;
	__s32 rtr_solicits;
	__s32 rtr_solicit_interval;
	__s32 rtr_solicit_max_interval;
	__s32 rtr_solicit_delay;
	__s32 force_mld_version;
	__s32 mldv1_unsolicited_report_interval;
	__s32 mldv2_unsolicited_report_interval;
	__s32 use_tempaddr;
	__s32 temp_valid_lft;
	__s32 temp_prefered_lft;
	__s32 regen_max_retry;
	__s32 max_desync_factor;
	__s32 max_addresses;
	__s32 accept_ra_defrtr;
	__u32 ra_defrtr_metric;
	__s32 accept_ra_min_hop_limit;
	__s32 accept_ra_pinfo;
	__s32 ignore_routes_with_linkdown;
	#ifdef CONFIG_IPV6_ROUTER_PREF
	__s32 accept_ra_rtr_pref;
	__s32 rtr_probe_interval;
	#ifdef CONFIG_IPV6_ROUTE_INFO
	__s32 accept_ra_rt_info_min_plen;
	__s32 accept_ra_rt_info_max_plen;
	#endif
	#endif
	__s32 proxy_ndp;
	__s32 accept_source_route;
	__s32 accept_ra_from_local;
	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	__s32 optimistic_dad;
	__s32 use_optimistic;
	#endif
	#ifdef CONFIG_IPV6_MROUTE
	atomic_t mc_forwarding;
	#endif
	__s32 disable_ipv6;
	__s32 drop_unicast_in_l2_multicast;
	__s32 accept_dad;
	__s32 force_tllao;
	__s32 ndisc_notify;
	__s32 suppress_frag_ndisc;
	__s32 accept_ra_mtu;
	__s32 drop_unsolicited_na;
	struct ipv6_stable_secret {
	bool initialized;
	struct in6_addr secret;
	} stable_secret;
	__s32 use_oif_addrs_only;
	__s32 keep_addr_on_down;
	__s32 seg6_enabled;
	#ifdef CONFIG_IPV6_SEG6_HMAC
	__s32 seg6_require_hmac;
	#endif
	__u32 enhanced_dad;
	__u32 addr_gen_mode;
	__s32 disable_policy;
	__s32 ndisc_tclass;
	__s32 rpl_seg_enabled;
	__u32 ioam6_id;
	__u32 ioam6_id_wide;
	__u8 ioam6_enabled;
	__u8 ndisc_evict_nocarrier;

	struct ctl_table_header *sysctl_header;
	};

	struct ipv6_params {
	__s32 disable_ipv6;
	__s32 autoconf;
	};
	extern struct ipv6_params ipv6_defaults;
	#include <linux/tcp.h>
	#include <linux/udp.h>

	#include <net/inet_sock.h>

	static inline struct ipv6hdr ipv6_hdr(const struct sk_buff skb)
	{
	return (struct ipv6hdr *)skb_network_header(skb);
	}

	static inline struct ipv6hdr inner_ipv6_hdr(const struct sk_buff skb)
	{
	return (struct ipv6hdr *)skb_inner_network_header(skb);
	}

	static inline struct ipv6hdr ipipv6_hdr(const struct sk_buff skb)
	{
	return (struct ipv6hdr *)skb_transport_header(skb);
	}

	static inline unsigned int ipv6_transport_len(const struct sk_buff *skb)
	{
	return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) -
	skb_network_header_len(skb);
	}

	/*
	This structure contains results of exthdrs parsing
	as offsets from skb->nh.
	*/

	struct inet6_skb_parm {
	int iif;
	__be16 ra;
	__u16 dst0;
	__u16 srcrt;
	__u16 dst1;
	__u16 lastopt;
	__u16 nhoff;
	__u16 flags;
	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	__u16 dsthao;
	#endif
	__u16 frag_max_size;
	__u16 srhoff;

	#define IP6SKB_XFRM_TRANSFORMED 1
	#define IP6SKB_FORWARDED 2
	#define IP6SKB_REROUTED 4
	#define IP6SKB_ROUTERALERT 8
	#define IP6SKB_FRAGMENTED 16
	#define IP6SKB_HOPBYHOP 32
	#define IP6SKB_L3SLAVE 64
	#define IP6SKB_JUMBOGRAM 128
	#define IP6SKB_SEG6 256
	};

	#if defined(CONFIG_NET_L3_MASTER_DEV)
	static inline bool ipv6_l3mdev_skb(__u16 flags)
	{
	return flags & IP6SKB_L3SLAVE;
	}
	#else
	static inline bool ipv6_l3mdev_skb(__u16 flags)
	{
	return false;
	}
	#endif

	#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
	#define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb))

	static inline int inet6_iif(const struct sk_buff *skb)
	{
	bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags);

	return l3_slave ? skb->skb_iif : IP6CB(skb)->iif;
	}

	static inline bool inet6_is_jumbogram(const struct sk_buff *skb)
	{
	return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM);
	}

	/* can not be used in TCP layer after tcp_v6_fill_cb */
	static inline int inet6_sdif(const struct sk_buff *skb)
	{
	#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
	if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
	return IP6CB(skb)->iif;
	#endif
	return 0;
	}

	struct tcp6_request_sock {
	struct tcp_request_sock tcp6rsk_tcp;
	};

	struct ipv6_mc_socklist;
	struct ipv6_ac_socklist;
	struct ipv6_fl_socklist;

	struct inet6_cork {
	struct ipv6_txoptions *opt;
	u8 hop_limit;
	u8 tclass;
	};

	/**
	* struct ipv6_pinfo - ipv6 private area
	*
	* In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
	* this _must_ be the last member, so that inet6_sk_generic
	* is able to calculate its offset from the base struct sock
	* by using the struct proto->slab_obj_size member. -acme
	*/
	struct ipv6_pinfo {
	struct in6_addr saddr;
	struct in6_pktinfo sticky_pktinfo;
	const struct in6_addr *daddr_cache;
	#ifdef CONFIG_IPV6_SUBTREES
	const struct in6_addr *saddr_cache;
	#endif

	__be32 flow_label;
	__u32 frag_size;

	/*
	* Packed in 16bits.
	* Omit one shift by putting the signed field at MSB.
	*/
	#if defined(__BIG_ENDIAN_BITFIELD)
	__s16 hop_limit:9;
	__u16 __unused_1:7;
	#else
	__u16 __unused_1:7;
	__s16 hop_limit:9;
	#endif

	#if defined(__BIG_ENDIAN_BITFIELD)
	/* Packed in 16bits. */
	__s16 mcast_hops:9;
	__u16 __unused_2:6,
	mc_loop:1;
	#else
	__u16 mc_loop:1,
	__unused_2:6;
	__s16 mcast_hops:9;
	#endif
	int ucast_oif;
	int mcast_oif;

	/* pktoption flags */
	union {
	struct {
	__u16 srcrt:1,
	osrcrt:1,
	rxinfo:1,
	rxoinfo:1,
	rxhlim:1,
	rxohlim:1,
	hopopts:1,
	ohopopts:1,
	dstopts:1,
	odstopts:1,
	rxflow:1,
	rxtclass:1,
	rxpmtu:1,
	rxorigdstaddr:1,
	recvfragsize:1;
	/* 1 bits hole */
	} bits;
	__u16 all;
	} rxopt;

	/* sockopt flags */
	__u16 recverr:1,
	sndflow:1,
	repflow:1,
	pmtudisc:3,
	padding:1, /* 1 bit hole */
	srcprefs:3, /* 001: prefer temporary address
	* 010: prefer public address
	* 100: prefer care-of address
	*/
	dontfrag:1,
	autoflowlabel:1,
	autoflowlabel_set:1,
	mc_all:1,
	recverr_rfc4884:1,
	rtalert_isolate:1;
	__u8 min_hopcount;
	__u8 tclass;
	__be32 rcv_flowinfo;

	__u32 dst_cookie;

	struct ipv6_mc_socklist __rcu *ipv6_mc_list;
	struct ipv6_ac_socklist *ipv6_ac_list;
	struct ipv6_fl_socklist __rcu *ipv6_fl_list;

	struct ipv6_txoptions __rcu *opt;
	struct sk_buff *pktoptions;
	struct sk_buff *rxpmtu;
	struct inet6_cork cork;
	};

	/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
	struct raw6_sock {
	/* inet_sock has to be the first member of raw6_sock */
	struct inet_sock inet;
	__u32 checksum; /* perform checksum */
	__u32 offset; /* checksum offset */
	struct icmp6_filter filter;
	__u32 ip6mr_table;
	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
	struct ipv6_pinfo inet6;
	};

	struct udp6_sock {
	struct udp_sock udp;
	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
	struct ipv6_pinfo inet6;
	};

	struct tcp6_sock {
	struct tcp_sock tcp;
	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
	struct ipv6_pinfo inet6;
	};

	extern int inet6_sk_rebuild_header(struct sock *sk);

	struct tcp6_timewait_sock {
	struct tcp_timewait_sock tcp6tw_tcp;
	};

	#if IS_ENABLED(CONFIG_IPV6)
	bool ipv6_mod_enabled(void);

	static inline struct ipv6_pinfo inet6_sk(const struct sock __sk)
	{
	return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
	}

	static inline struct raw6_sock raw6_sk(const struct sock sk)
	{
	return (struct raw6_sock *)sk;
	}

	#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
	#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
	#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
	inet6_sk(sk)->rxopt.bits.rxinfo)

	static inline const struct in6_addr inet6_rcv_saddr(const struct sock sk)
	{
	if (sk->sk_family == AF_INET6)
	return &sk->sk_v6_rcv_saddr;
	return NULL;
	}

	static inline int inet_v6_ipv6only(const struct sock *sk)
	{
	/* ipv6only field is at same position for timewait and other sockets */
	return ipv6_only_sock(sk);
	}
	#else
	#define __ipv6_only_sock(sk) 0
	#define ipv6_only_sock(sk) 0
	#define ipv6_sk_rxinfo(sk) 0

	static inline bool ipv6_mod_enabled(void)
	{
	return false;
	}

	static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
	{
	return NULL;
	}

	static inline struct raw6_sock raw6_sk(const struct sock sk)
	{
	return NULL;
	}

	#define inet6_rcv_saddr(__sk) NULL
	#define inet_v6_ipv6only(__sk) 0
	#endif /* IS_ENABLED(CONFIG_IPV6) */
	#endif /* _IPV6_H */