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

#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/flow.h>
#include <net/ip6_fib.h>
#include <net/sock.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

/*
 * 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;
}

void rt6_bind_peer(struct rt6_info *rt, int create);

static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
{
	if (rt6_has_peer(rt))
		return rt6_peer_ptr(rt);

	rt6_bind_peer(rt, create);
	return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
}

static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
{
	return __rt6_get_peer(rt, 0);
}

static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
{
	return __rt6_get_peer(rt, 1);
}

void ip6_route_input(struct sk_buff *skb);

struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
				   struct flowi6 *fl6);
struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
				   int flags);

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);
int ip6_ins_rt(struct rt6_info *);
int ip6_del_rt(struct rt6_info *);

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 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);
int icmp6_dst_gc(void);

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);

/*
 *	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);
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);
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);


/*
 *	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);
	struct rt6_info *rt = (struct rt6_info *) dst;

	sk_setup_caps(sk, dst);
	np->daddr_cache = daddr;
#ifdef CONFIG_IPV6_SUBTREES
	np->saddr_cache = saddr;
#endif
	np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
}

static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
				 struct in6_addr *daddr, struct in6_addr *saddr)
{
	spin_lock(&sk->sk_dst_lock);
	__ip6_dst_store(sk, dst, daddr, saddr);
	spin_unlock(&sk->sk_dst_lock);
}

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;
}

int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));

static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
{
	struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;

	return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
	       skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
}

static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
{
	return &rt->rt6i_gateway;
}

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _NET_IP6_ROUTE_H
	2	#define _NET_IP6_ROUTE_H
	3
70ceb4f5 YH	4	struct route_info {
	5	__u8 type;
	6	__u8 length;
	7	__u8 prefix_len;
	8	#if defined(__BIG_ENDIAN_BITFIELD)
	9	__u8 reserved_h:3,
	10	route_pref:2,
	11	reserved_l:3;
	12	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	13	__u8 reserved_l:3,
	14	route_pref:2,
	15	reserved_h:3;
	16	#endif
e69a4adc	17	__be32 lifetime;
70ceb4f5 YH	18	__u8 prefix[0]; /* 0,8 or 16 */
	19	};
	20
1da177e4 LT	21	#include <net/flow.h>
	22	#include <net/ip6_fib.h>
	23	#include <net/sock.h>
1da177e4 LT	24	#include <linux/ip.h>
1da177e4 LT	25	#include <linux/ipv6.h>
9bb5a148	26	#include <linux/route.h>
1da177e4	27
7cbca67c YH	28	#define RT6_LOOKUP_F_IFACE 0x00000001
	29	#define RT6_LOOKUP_F_REACHABLE 0x00000002
	30	#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
	31	#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
	32	#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
	33	#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
77d16f45	34
0c9a2ac1 YH	35	/*
	36	* rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
	37	* between IPV6_ADDR_PREFERENCES socket option values
	38	* IPV6_PREFER_SRC_TMP = 0x1
	39	* IPV6_PREFER_SRC_PUBLIC = 0x2
	40	* IPV6_PREFER_SRC_COA = 0x4
	41	* and above RT6_LOOKUP_F_SRCPREF_xxx flags.
	42	*/
	43	static inline int rt6_srcprefs2flags(unsigned int srcprefs)
	44	{
	45	/* No need to bitmask because srcprefs have only 3 bits. */
	46	return srcprefs << 3;
	47	}
	48
	49	static inline unsigned int rt6_flags2srcprefs(int flags)
	50	{
	51	return (flags >> 3) & 7;
	52	}
1da177e4	53
5c3a0fd7	54	void rt6_bind_peer(struct rt6_info *rt, int create);
b3419363	55
fbfe95a4	56	static inline struct inet_peer __rt6_get_peer(struct rt6_info rt, int create)
15c05425	57	{
97bab73f DM	58	if (rt6_has_peer(rt))
97bab73f DM	59	return rt6_peer_ptr(rt);
15c05425	60
fbfe95a4	61	rt6_bind_peer(rt, create);
55afabaa	62	return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
15c05425 DM	63	}
15c05425 DM	64
fbfe95a4 DM	65	static inline struct inet_peer rt6_get_peer(struct rt6_info rt)
	66	{
	67	return __rt6_get_peer(rt, 0);
	68	}
	69
	70	static inline struct inet_peer rt6_get_peer_create(struct rt6_info rt)
	71	{
	72	return __rt6_get_peer(rt, 1);
	73	}
	74
5c3a0fd7	75	void ip6_route_input(struct sk_buff *skb);
1da177e4	76
5c3a0fd7 JP	77	struct dst_entry ip6_route_output(struct net net, const struct sock *sk,
	78	struct flowi6 *fl6);
	79	struct dst_entry ip6_route_lookup(struct net net, struct flowi6 *fl6,
	80	int flags);
1da177e4	81
5c3a0fd7 JP	82	int ip6_route_init(void);
5c3a0fd7 JP	83	void ip6_route_cleanup(void);
1da177e4	84
5c3a0fd7	85	int ipv6_route_ioctl(struct net net, unsigned int cmd, void __user arg);
1da177e4	86
5c3a0fd7 JP	87	int ip6_route_add(struct fib6_config *cfg);
	88	int ip6_ins_rt(struct rt6_info *);
	89	int ip6_del_rt(struct rt6_info *);
1da177e4	90
5c3a0fd7 JP	91	int ip6_route_get_saddr(struct net net, struct rt6_info rt,
	92	const struct in6_addr *daddr, unsigned int prefs,
	93	struct in6_addr *saddr);
c3968a85	94
5c3a0fd7 JP	95	struct rt6_info rt6_lookup(struct net net, const struct in6_addr *daddr,
5c3a0fd7 JP	96	const struct in6_addr *saddr, int oif, int flags);
1da177e4	97
5c3a0fd7 JP	98	struct dst_entry icmp6_dst_alloc(struct net_device dev, struct flowi6 *fl6);
5c3a0fd7 JP	99	int icmp6_dst_gc(void);
3b00944c	100
5c3a0fd7	101	void fib6_force_start_gc(struct net *net);
1da177e4	102
5c3a0fd7 JP	103	struct rt6_info addrconf_dst_alloc(struct inet6_dev idev,
5c3a0fd7 JP	104	const struct in6_addr *addr, bool anycast);
1da177e4 LT	105
	106	/*
	107	* support functions for ND
	108	*
	109	*/
5c3a0fd7 JP	110	struct rt6_info rt6_get_dflt_router(const struct in6_addr addr,
	111	struct net_device *dev);
	112	struct rt6_info rt6_add_dflt_router(const struct in6_addr gwaddr,
	113	struct net_device *dev, unsigned int pref);
	114
	115	void rt6_purge_dflt_routers(struct net *net);
	116
	117	int rt6_route_rcv(struct net_device dev, u8 opt, int len,
	118	const struct in6_addr *gwaddr);
	119
	120	void ip6_update_pmtu(struct sk_buff skb, struct net net, __be32 mtu, int oif,
	121	u32 mark);
	122	void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu);
	123	void ip6_redirect(struct sk_buff skb, struct net net, int oif, u32 mark);
	124	void ip6_redirect_no_header(struct sk_buff skb, struct net net, int oif,
	125	u32 mark);
	126	void ip6_sk_redirect(struct sk_buff skb, struct sock sk);
1da177e4	127
1da177e4	128	struct netlink_callback;
1da177e4	129
fd2c3ef7	130	struct rt6_rtnl_dump_arg {
1b43af54 PM	131	struct sk_buff *skb;
1b43af54 PM	132	struct netlink_callback *cb;
191cd582	133	struct net *net;
1b43af54 PM	134	};
1b43af54 PM	135
5c3a0fd7 JP	136	int rt6_dump_route(struct rt6_info rt, void p_arg);
	137	void rt6_ifdown(struct net net, struct net_device dev);
	138	void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
	139	void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
1da177e4	140
1da177e4 LT	141
	142	/*
	143	* Store a destination cache entry in a socket
	144	*/
497c615a	145	static inline void __ip6_dst_store(struct sock sk, struct dst_entry dst,
d3818c92 ED	146	const struct in6_addr *daddr,
d3818c92 ED	147	const struct in6_addr *saddr)
1da177e4 LT	148	{
	149	struct ipv6_pinfo *np = inet6_sk(sk);
	150	struct rt6_info rt = (struct rt6_info ) dst;
	151
f83ef8c0	152	sk_setup_caps(sk, dst);
1da177e4	153	np->daddr_cache = daddr;
8e1ef0a9 YH	154	#ifdef CONFIG_IPV6_SUBTREES
	155	np->saddr_cache = saddr;
	156	#endif
1da177e4	157	np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
497c615a HX	158	}
	159
	160	static inline void ip6_dst_store(struct sock sk, struct dst_entry dst,
8e1ef0a9	161	struct in6_addr daddr, struct in6_addr saddr)
497c615a	162	{
b6c6712a	163	spin_lock(&sk->sk_dst_lock);
8e1ef0a9	164	__ip6_dst_store(sk, dst, daddr, saddr);
b6c6712a	165	spin_unlock(&sk->sk_dst_lock);
1da177e4 LT	166	}
1da177e4 LT	167
a50feda5	168	static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4	169	{
adf30907	170	struct rt6_info rt = (struct rt6_info ) skb_dst(skb);
1da177e4 LT	171
	172	return rt->rt6i_flags & RTF_LOCAL;
	173	}
	174
ad0081e4 DS	175	int ip6_fragment(struct sk_buff skb, int (output)(struct sk_buff *));
	176
	177	static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
	178	{
	179	struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
	180
	181	return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
	182	skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
	183	}
	184
550bab42	185	static inline struct in6_addr rt6_nexthop(struct rt6_info rt)
9bb5a148	186	{
550bab42	187	return &rt->rt6i_gateway;
9bb5a148 YH	188	}
9bb5a148 YH	189
1da177e4	190	#endif