/* SPDX-License-Identifier: GPL-2.0 */#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[];	/* 0,8 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>#include <net/nexthop.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#define RT6_LOOKUP_F_DST_NOREF		0x00000080 /* 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);} /* fib entries using a nexthop object can not be coalesced into * a multipath route */static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i){	/* the RTF_ADDRCONF flag filters out RA's */	return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh &&		f6i->fib6_nh->fib_nh_gw_family;} 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,					 const struct sk_buff *skb, int flags); struct dst_entry *ip6_route_output_flags_noref(struct net *net,					       const struct sock *sk,					       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);} /* Only conditionally release dst if flags indicates * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list. */static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags){	if (!(flags & RT6_LOOKUP_F_DST_NOREF) ||	    !list_empty(&rt->rt6i_uncached))		ip6_rt_put(rt);} struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,				   const struct sk_buff *skb, int flags);struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,			       int ifindex, struct flowi6 *fl6,			       const struct sk_buff *skb, 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,		struct in6_rtmsg *rtmsg); int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,		  struct netlink_ext_ack *extack);int ip6_ins_rt(struct net *net, struct fib6_info *f6i);int ip6_del_rt(struct net *net, struct fib6_info *f6i, bool skip_notify); void rt6_flush_exceptions(struct fib6_info *f6i);void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,			unsigned long now); static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,				      const struct in6_addr *daddr,				      unsigned int prefs,				      struct in6_addr *saddr){	int err = 0; 	if (f6i && f6i->fib6_prefsrc.plen) {		*saddr = f6i->fib6_prefsrc.addr;	} else {		struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL; 		err = ipv6_dev_get_saddr(net, dev, 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,			    const struct sk_buff *skb, int flags);u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,		       const struct sk_buff *skb, struct flow_keys *hkeys); struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); void fib6_force_start_gc(struct net *net); struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,				     const struct in6_addr *addr, bool anycast,				     gfp_t gfp_flags); struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,			       int flags); /* *	support functions for ND * */struct fib6_info *rt6_get_dflt_router(struct net *net,				     const struct in6_addr *addr,				     struct net_device *dev);struct fib6_info *rt6_add_dflt_router(struct net *net,				     const struct in6_addr *gwaddr,				     struct net_device *dev, unsigned int pref,				     u32 defrtr_usr_metric); 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);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;	struct fib_dump_filter filter;}; int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip);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);void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);void rt6_disable_ip(struct net_device *dev, unsigned long event);void rt6_sync_down_dev(struct net_device *dev, unsigned long event);void rt6_multipath_rebalance(struct fib6_info *f6i); void rt6_uncached_list_add(struct rt6_info *rt);void rt6_uncached_list_del(struct rt6_info *rt); static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb){	const struct dst_entry *dst = skb_dst(skb);	const struct rt6_info *rt6 = NULL; 	if (dst)		rt6 = container_of(dst, struct rt6_info, dst); 	return rt6;} /* *	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} void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,			   const struct flowi6 *fl6); 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 < 127 &&		 !(rt->rt6i_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) &&		 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 const struct in6_addr *rt6_nexthop(const struct rt6_info *rt,						 const 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 fib6_info *a, struct fib6_info *b){	struct fib6_nh *nha, *nhb; 	if (a->nh || b->nh)		return nexthop_cmp(a->nh, b->nh); 	nha = a->fib6_nh;	nhb = b->fib6_nh;	return nha->fib_nh_dev == nhb->fib_nh_dev &&	       ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&	       !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);} static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst){	struct inet6_dev *idev;	unsigned int mtu; 	if (dst_metric_locked(dst, RTAX_MTU)) {		mtu = dst_metric_raw(dst, RTAX_MTU);		if (mtu)			return mtu;	} 	mtu = IPV6_MIN_MTU;	rcu_read_lock();	idev = __in6_dev_get(dst->dev);	if (idev)		mtu = idev->cnf.mtu6;	rcu_read_unlock(); 	return mtu;} u32 ip6_mtu_from_fib6(const struct fib6_result *res,		      const struct in6_addr *daddr,		      const struct in6_addr *saddr); struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,				   struct net_device *dev, struct sk_buff *skb,				   const void *daddr);#endif