[mirror_ubuntu-hirsute-kernel.git] / include / net / ip6_route.h

/* 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, void __user *arg);

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);

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);

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 &&
		 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
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _NET_IP6_ROUTE_H
	3	#define _NET_IP6_ROUTE_H
	4
70ceb4f5 YH	5	struct route_info {
	6	__u8 type;
	7	__u8 length;
	8	__u8 prefix_len;
	9	#if defined(__BIG_ENDIAN_BITFIELD)
	10	__u8 reserved_h:3,
	11	route_pref:2,
	12	reserved_l:3;
	13	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	14	__u8 reserved_l:3,
	15	route_pref:2,
	16	reserved_h:3;
	17	#endif
e69a4adc	18	__be32 lifetime;
207644f5	19	__u8 prefix[]; /* 0,8 or 16 */
70ceb4f5 YH	20	};
70ceb4f5 YH	21
a2e2ff56	22	#include <net/addrconf.h>
1da177e4 LT	23	#include <net/flow.h>
	24	#include <net/ip6_fib.h>
	25	#include <net/sock.h>
f06b7549	26	#include <net/lwtunnel.h>
1da177e4 LT	27	#include <linux/ip.h>
1da177e4 LT	28	#include <linux/ipv6.h>
9bb5a148	29	#include <linux/route.h>
f88d8ea6	30	#include <net/nexthop.h>
1da177e4	31
7cbca67c YH	32	#define RT6_LOOKUP_F_IFACE 0x00000001
	33	#define RT6_LOOKUP_F_REACHABLE 0x00000002
	34	#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
	35	#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
	36	#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
	37	#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
d5d32e4b	38	#define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
0e09edcc	39	#define RT6_LOOKUP_F_DST_NOREF 0x00000080
77d16f45	40
30f78d8e ED	41	/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
	42	* Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
	43	*/
	44	#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
	45
0c9a2ac1 YH	46	/*
	47	* rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
	48	* between IPV6_ADDR_PREFERENCES socket option values
	49	* IPV6_PREFER_SRC_TMP = 0x1
	50	* IPV6_PREFER_SRC_PUBLIC = 0x2
	51	* IPV6_PREFER_SRC_COA = 0x4
	52	* and above RT6_LOOKUP_F_SRCPREF_xxx flags.
	53	*/
	54	static inline int rt6_srcprefs2flags(unsigned int srcprefs)
	55	{
	56	/* No need to bitmask because srcprefs have only 3 bits. */
	57	return srcprefs << 3;
	58	}
	59
	60	static inline unsigned int rt6_flags2srcprefs(int flags)
	61	{
	62	return (flags >> 3) & 7;
	63	}
1da177e4	64
60ea37f7 WY	65	static inline bool rt6_need_strict(const struct in6_addr *daddr)
	66	{
	67	return ipv6_addr_type(daddr) &
	68	(IPV6_ADDR_MULTICAST \| IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_LOOPBACK);
	69	}
fbfe95a4	70
f88d8ea6 DA	71	/* fib entries using a nexthop object can not be coalesced into
	72	* a multipath route
	73	*/
33bd5ac5 DA	74	static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
33bd5ac5 DA	75	{
be659b8d	76	/* the RTF_ADDRCONF flag filters out RA's */
f88d8ea6	77	return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh &&
1cf844c7	78	f6i->fib6_nh->fib_nh_gw_family;
33bd5ac5 DA	79	}
33bd5ac5 DA	80
5c3a0fd7	81	void ip6_route_input(struct sk_buff *skb);
d409b847 MB	82	struct dst_entry ip6_route_input_lookup(struct net net,
d409b847 MB	83	struct net_device *dev,
b75cc8f9 DA	84	struct flowi6 *fl6,
b75cc8f9 DA	85	const struct sk_buff *skb, int flags);
1da177e4	86
7d9e5f42 WW	87	struct dst_entry ip6_route_output_flags_noref(struct net net,
	88	const struct sock *sk,
	89	struct flowi6 *fl6, int flags);
	90
6f21c96a PA	91	struct dst_entry ip6_route_output_flags(struct net net, const struct sock *sk,
	92	struct flowi6 *fl6, int flags);
	93
	94	static inline struct dst_entry ip6_route_output(struct net net,
	95	const struct sock *sk,
	96	struct flowi6 *fl6)
	97	{
	98	return ip6_route_output_flags(net, sk, fl6, 0);
	99	}
	100
d64a1f57 WW	101	/* Only conditionally release dst if flags indicates
	102	* !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
	103	*/
	104	static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags)
	105	{
	106	if (!(flags & RT6_LOOKUP_F_DST_NOREF) \|\|
	107	!list_empty(&rt->rt6i_uncached))
	108	ip6_rt_put(rt);
	109	}
	110
5c3a0fd7	111	struct dst_entry ip6_route_lookup(struct net net, struct flowi6 *fl6,
b75cc8f9	112	const struct sk_buff *skb, int flags);
9ff74384	113	struct rt6_info ip6_pol_route(struct net net, struct fib6_table *table,
b75cc8f9 DA	114	int ifindex, struct flowi6 *fl6,
b75cc8f9 DA	115	const struct sk_buff *skb, int flags);
1da177e4	116
2f460933	117	void ip6_route_init_special_entries(void);
5c3a0fd7 JP	118	int ip6_route_init(void);
5c3a0fd7 JP	119	void ip6_route_cleanup(void);
1da177e4	120
5c3a0fd7	121	int ipv6_route_ioctl(struct net net, unsigned int cmd, void __user arg);
1da177e4	122
acb54e3c DA	123	int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
acb54e3c DA	124	struct netlink_ext_ack *extack);
93c2fb25 DA	125	int ip6_ins_rt(struct net net, struct fib6_info f6i);
93c2fb25 DA	126	int ip6_del_rt(struct net net, struct fib6_info f6i);
1da177e4	127
93c2fb25 DA	128	void rt6_flush_exceptions(struct fib6_info *f6i);
93c2fb25 DA	129	void rt6_age_exceptions(struct fib6_info f6i, struct fib6_gc_args gc_args,
c757faa8	130	unsigned long now);
35732d01	131
93c2fb25	132	static inline int ip6_route_get_saddr(struct net net, struct fib6_info f6i,
a2e2ff56 DA	133	const struct in6_addr *daddr,
	134	unsigned int prefs,
	135	struct in6_addr *saddr)
	136	{
a2e2ff56 DA	137	int err = 0;
a2e2ff56 DA	138
6fe74941	139	if (f6i && f6i->fib6_prefsrc.plen) {
93c2fb25	140	*saddr = f6i->fib6_prefsrc.addr;
6fe74941 DA	141	} else {
	142	struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
	143
	144	err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
	145	}
a2e2ff56 DA	146
	147	return err;
	148	}
c3968a85	149
5c3a0fd7	150	struct rt6_info rt6_lookup(struct net net, const struct in6_addr *daddr,
b75cc8f9 DA	151	const struct in6_addr *saddr, int oif,
b75cc8f9 DA	152	const struct sk_buff *skb, int flags);
b4bac172 DA	153	u32 rt6_multipath_hash(const struct net net, const struct flowi6 fl6,
b4bac172 DA	154	const struct sk_buff skb, struct flow_keys hkeys);
1da177e4	155
5c3a0fd7	156	struct dst_entry icmp6_dst_alloc(struct net_device dev, struct flowi6 *fl6);
3b00944c	157
5c3a0fd7	158	void fib6_force_start_gc(struct net *net);
1da177e4	159
360a9887	160	struct fib6_info addrconf_f6i_alloc(struct net net, struct inet6_dev *idev,
8d1c802b DA	161	const struct in6_addr *addr, bool anycast,
8d1c802b DA	162	gfp_t gfp_flags);
1da177e4	163
9ab179d8 DA	164	struct rt6_info ip6_dst_alloc(struct net net, struct net_device *dev,
	165	int flags);
	166
1da177e4 LT	167	/*
	168	* support functions for ND
	169	*
	170	*/
8d1c802b	171	struct fib6_info rt6_get_dflt_router(struct net net,
afb1d4b5	172	const struct in6_addr *addr,
5c3a0fd7	173	struct net_device *dev);
8d1c802b	174	struct fib6_info rt6_add_dflt_router(struct net net,
afb1d4b5	175	const struct in6_addr *gwaddr,
5c3a0fd7 JP	176	struct net_device *dev, unsigned int pref);
	177
	178	void rt6_purge_dflt_routers(struct net *net);
	179
	180	int rt6_route_rcv(struct net_device dev, u8 opt, int len,
	181	const struct in6_addr *gwaddr);
	182
	183	void ip6_update_pmtu(struct sk_buff skb, struct net net, __be32 mtu, int oif,
e2d118a1	184	u32 mark, kuid_t uid);
5c3a0fd7	185	void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu);
e2d118a1 LC	186	void ip6_redirect(struct sk_buff skb, struct net net, int oif, u32 mark,
e2d118a1 LC	187	kuid_t uid);
d456336d	188	void ip6_redirect_no_header(struct sk_buff skb, struct net net, int oif);
5c3a0fd7	189	void ip6_sk_redirect(struct sk_buff skb, struct sock sk);
1da177e4	190
1da177e4	191	struct netlink_callback;
1da177e4	192
fd2c3ef7	193	struct rt6_rtnl_dump_arg {
1b43af54 PM	194	struct sk_buff *skb;
1b43af54 PM	195	struct netlink_callback *cb;
191cd582	196	struct net *net;
4724676d	197	struct fib_dump_filter filter;
1b43af54 PM	198	};
1b43af54 PM	199
1e47b483	200	int rt6_dump_route(struct fib6_info f6i, void p_arg, unsigned int skip);
5c3a0fd7 JP	201	void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
5c3a0fd7 JP	202	void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
be7a010d	203	void rt6_clean_tohost(struct net net, struct in6_addr gateway);
ecc5663c	204	void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
4c981e28	205	void rt6_disable_ip(struct net_device *dev, unsigned long event);
27c6fa73	206	void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
93c2fb25	207	void rt6_multipath_rebalance(struct fib6_info *f6i);
1da177e4	208
510c321b XL	209	void rt6_uncached_list_add(struct rt6_info *rt);
	210	void rt6_uncached_list_del(struct rt6_info *rt);
	211
1b70d792 DA	212	static inline const struct rt6_info skb_rt6_info(const struct sk_buff skb)
	213	{
	214	const struct dst_entry *dst = skb_dst(skb);
	215	const struct rt6_info *rt6 = NULL;
	216
	217	if (dst)
	218	rt6 = container_of(dst, struct rt6_info, dst);
	219
	220	return rt6;
	221	}
1da177e4 LT	222
	223	/*
	224	* Store a destination cache entry in a socket
	225	*/
6bd4f355 ED	226	static inline void ip6_dst_store(struct sock sk, struct dst_entry dst,
	227	const struct in6_addr *daddr,
	228	const struct in6_addr *saddr)
1da177e4 LT	229	{
1da177e4 LT	230	struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4	231
6bd4f355	232	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
f83ef8c0	233	sk_setup_caps(sk, dst);
1da177e4	234	np->daddr_cache = daddr;
8e1ef0a9 YH	235	#ifdef CONFIG_IPV6_SUBTREES
	236	np->saddr_cache = saddr;
	237	#endif
1da177e4 LT	238	}
1da177e4 LT	239
7d6850f7 AK	240	void ip6_sk_dst_store_flow(struct sock sk, struct dst_entry dst,
	241	const struct flowi6 *fl6);
	242
a50feda5	243	static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4	244	{
adf30907	245	struct rt6_info rt = (struct rt6_info ) skb_dst(skb);
1da177e4 LT	246
	247	return rt->rt6i_flags & RTF_LOCAL;
	248	}
	249
2647a9b0 MKL	250	static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
2647a9b0 MKL	251	const struct in6_addr *daddr)
509aba3b	252	{
2647a9b0	253	struct rt6_info rt = (struct rt6_info )dst;
509aba3b	254
2647a9b0	255	return rt->rt6i_flags & RTF_ANYCAST \|\|
ccdb2d17	256	(rt->rt6i_dst.plen < 127 &&
2647a9b0	257	ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
509aba3b FLB	258	}
509aba3b FLB	259
7d8c6e39 EB	260	int ip6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
7d8c6e39 EB	261	int (output)(struct net , struct sock , struct sk_buff ));
ad0081e4 DS	262
	263	static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
	264	{
f60e5990	265	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
f60e5990	266	inet6_sk(skb->sk) : NULL;
ad0081e4	267
93b36cf3	268	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
ad0081e4 DS	269	skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
	270	}
	271
93b36cf3 HFS	272	static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
93b36cf3 HFS	273	{
0b95227a HFS	274	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
	275	inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
	276	}
	277
60ff7467	278	static inline bool ip6_sk_ignore_df(const struct sock *sk)
0b95227a HFS	279	{
	280	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO \|\|
	281	inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
93b36cf3 HFS	282	}
93b36cf3 HFS	283
9b1c1ef1 ND	284	static inline const struct in6_addr rt6_nexthop(const struct rt6_info rt,
9b1c1ef1 ND	285	const struct in6_addr *daddr)
9bb5a148	286	{
2647a9b0 MKL	287	if (rt->rt6i_flags & RTF_GATEWAY)
2647a9b0 MKL	288	return &rt->rt6i_gateway;
45e4fd26	289	else if (unlikely(rt->rt6i_flags & RTF_CACHE))
2647a9b0 MKL	290	return &rt->rt6i_dst.addr;
	291	else
	292	return daddr;
9bb5a148 YH	293	}
9bb5a148 YH	294
8d1c802b	295	static inline bool rt6_duplicate_nexthop(struct fib6_info a, struct fib6_info b)
f06b7549	296	{
f88d8ea6 DA	297	struct fib6_nh nha, nhb;
	298
	299	if (a->nh \|\| b->nh)
	300	return nexthop_cmp(a->nh, b->nh);
ad1601ae	301
f88d8ea6 DA	302	nha = a->fib6_nh;
f88d8ea6 DA	303	nhb = b->fib6_nh;
ad1601ae DA	304	return nha->fib_nh_dev == nhb->fib_nh_dev &&
	305	ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&
	306	!lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);
f06b7549	307	}
5e5d6fed	308
07cb9623 FF	309	static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
	310	{
	311	struct inet6_dev *idev;
	312	unsigned int mtu;
	313
	314	if (dst_metric_locked(dst, RTAX_MTU)) {
	315	mtu = dst_metric_raw(dst, RTAX_MTU);
	316	if (mtu)
	317	return mtu;
	318	}
	319
	320	mtu = IPV6_MIN_MTU;
	321	rcu_read_lock();
	322	idev = __in6_dev_get(dst->dev);
	323	if (idev)
	324	mtu = idev->cnf.mtu6;
	325	rcu_read_unlock();
	326
	327	return mtu;
	328	}
	329
b748f260 DA	330	u32 ip6_mtu_from_fib6(const struct fib6_result *res,
	331	const struct in6_addr *daddr,
	332	const struct in6_addr *saddr);
901731b8	333
f8a1b43b DA	334	struct neighbour ip6_neigh_lookup(const struct in6_addr gw,
	335	struct net_device dev, struct sk_buff skb,
	336	const void *daddr);
1da177e4	337	#endif