#ifndef _NET_IP6_ROUTE_H#define _NET_IP6_ROUTE_H struct route_info {	__u8			type;	__u8			length;	__u8			prefix_len;#if defined(__BIG_ENDIAN_BITFIELD)	__u8			reserved_h:3,				route_pref:2,				reserved_l:3;#elif defined(__LITTLE_ENDIAN_BITFIELD)	__u8			reserved_l:3,				route_pref:2,				reserved_h:3;#endif	__be32			lifetime;	__u8			prefix[0];	/* 0,8 or 16 */}; #include <net/addrconf.h>#include <net/flow.h>#include <net/ip6_fib.h>#include <net/sock.h>#include <net/lwtunnel.h>#include <linux/ip.h>#include <linux/ipv6.h>#include <linux/route.h> #define RT6_LOOKUP_F_IFACE		0x00000001#define RT6_LOOKUP_F_REACHABLE		0x00000002#define RT6_LOOKUP_F_HAS_SADDR		0x00000004#define RT6_LOOKUP_F_SRCPREF_TMP	0x00000008#define RT6_LOOKUP_F_SRCPREF_PUBLIC	0x00000010#define RT6_LOOKUP_F_SRCPREF_COA	0x00000020#define RT6_LOOKUP_F_IGNORE_LINKSTATE	0x00000040 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675) * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header */#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) /* * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate * between IPV6_ADDR_PREFERENCES socket option values *	IPV6_PREFER_SRC_TMP    = 0x1 *	IPV6_PREFER_SRC_PUBLIC = 0x2 *	IPV6_PREFER_SRC_COA    = 0x4 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. */static inline int rt6_srcprefs2flags(unsigned int srcprefs){	/* No need to bitmask because srcprefs have only 3 bits. */	return srcprefs << 3;} static inline unsigned int rt6_flags2srcprefs(int flags){	return (flags >> 3) & 7;} static inline bool rt6_need_strict(const struct in6_addr *daddr){	return ipv6_addr_type(daddr) &		(IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);} void ip6_route_input(struct sk_buff *skb);struct dst_entry *ip6_route_input_lookup(struct net *net,					 struct net_device *dev,					 struct flowi6 *fl6, int flags); struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,					 struct flowi6 *fl6, int flags); static inline struct dst_entry *ip6_route_output(struct net *net,						 const struct sock *sk,						 struct flowi6 *fl6){	return ip6_route_output_flags(net, sk, fl6, 0);} struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,				   int flags);struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,			       int ifindex, struct flowi6 *fl6, int flags); void ip6_route_init_special_entries(void);int ip6_route_init(void);void ip6_route_cleanup(void); int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack);int ip6_ins_rt(struct rt6_info *);int ip6_del_rt(struct rt6_info *); static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,				      const struct in6_addr *daddr,				      unsigned int prefs,				      struct in6_addr *saddr){	struct inet6_dev *idev =			rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;	int err = 0; 	if (rt && rt->rt6i_prefsrc.plen)		*saddr = rt->rt6i_prefsrc.addr;	else		err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,					 daddr, prefs, saddr); 	return err;} struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,			    const struct in6_addr *saddr, int oif, int flags); struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); void fib6_force_start_gc(struct net *net); struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,				    const struct in6_addr *addr, bool anycast); struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,			       int flags); /* *	support functions for ND * */struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,				     struct net_device *dev);struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,				     struct net_device *dev, unsigned int pref); void rt6_purge_dflt_routers(struct net *net); int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,		  const struct in6_addr *gwaddr); void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,		     u32 mark, kuid_t uid);void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,		  kuid_t uid);void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,			    u32 mark);void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); struct netlink_callback; struct rt6_rtnl_dump_arg {	struct sk_buff *skb;	struct netlink_callback *cb;	struct net *net;}; int rt6_dump_route(struct rt6_info *rt, void *p_arg);void rt6_ifdown(struct net *net, struct net_device *dev);void rt6_mtu_change(struct net_device *dev, unsigned int mtu);void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);  /* *	Store a destination cache entry in a socket */static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,				 const struct in6_addr *daddr,				 const struct in6_addr *saddr){	struct ipv6_pinfo *np = inet6_sk(sk); 	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);	sk_setup_caps(sk, dst);	np->daddr_cache = daddr;#ifdef CONFIG_IPV6_SUBTREES	np->saddr_cache = saddr;#endif} static inline bool ipv6_unicast_destination(const struct sk_buff *skb){	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 	return rt->rt6i_flags & RTF_LOCAL;} static inline bool ipv6_anycast_destination(const struct dst_entry *dst,					    const struct in6_addr *daddr){	struct rt6_info *rt = (struct rt6_info *)dst; 	return rt->rt6i_flags & RTF_ANYCAST ||		(rt->rt6i_dst.plen != 128 &&		 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));} int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,		 int (*output)(struct net *, struct sock *, struct sk_buff *)); static inline int ip6_skb_dst_mtu(struct sk_buff *skb){	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?				inet6_sk(skb->sk) : NULL; 	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?	       skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));} static inline bool ip6_sk_accept_pmtu(const struct sock *sk){	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&	       inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;} static inline bool ip6_sk_ignore_df(const struct sock *sk){	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||	       inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;} static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,					   struct in6_addr *daddr){	if (rt->rt6i_flags & RTF_GATEWAY)		return &rt->rt6i_gateway;	else if (unlikely(rt->rt6i_flags & RTF_CACHE))		return &rt->rt6i_dst.addr;	else		return daddr;} static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b){	return a->dst.dev == b->dst.dev &&	       a->rt6i_idev == b->rt6i_idev &&	       ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&	       !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);}#endif