[mirror_ubuntu-zesty-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/addrconf.h>
#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

/* 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);

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 *);

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);
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);

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);
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);
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;
}

#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
a2e2ff56	21	#include <net/addrconf.h>
1da177e4 LT	22	#include <net/flow.h>
	23	#include <net/ip6_fib.h>
	24	#include <net/sock.h>
1da177e4 LT	25	#include <linux/ip.h>
1da177e4 LT	26	#include <linux/ipv6.h>
9bb5a148	27	#include <linux/route.h>
1da177e4	28
7cbca67c YH	29	#define RT6_LOOKUP_F_IFACE 0x00000001
	30	#define RT6_LOOKUP_F_REACHABLE 0x00000002
	31	#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
	32	#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
	33	#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
	34	#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
77d16f45	35
30f78d8e ED	36	/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
	37	* Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
	38	*/
	39	#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
	40
0c9a2ac1 YH	41	/*
	42	* rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
	43	* between IPV6_ADDR_PREFERENCES socket option values
	44	* IPV6_PREFER_SRC_TMP = 0x1
	45	* IPV6_PREFER_SRC_PUBLIC = 0x2
	46	* IPV6_PREFER_SRC_COA = 0x4
	47	* and above RT6_LOOKUP_F_SRCPREF_xxx flags.
	48	*/
	49	static inline int rt6_srcprefs2flags(unsigned int srcprefs)
	50	{
	51	/* No need to bitmask because srcprefs have only 3 bits. */
	52	return srcprefs << 3;
	53	}
	54
	55	static inline unsigned int rt6_flags2srcprefs(int flags)
	56	{
	57	return (flags >> 3) & 7;
	58	}
1da177e4	59
60ea37f7 WY	60	static inline bool rt6_need_strict(const struct in6_addr *daddr)
	61	{
	62	return ipv6_addr_type(daddr) &
	63	(IPV6_ADDR_MULTICAST \| IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_LOOPBACK);
	64	}
fbfe95a4	65
5c3a0fd7	66	void ip6_route_input(struct sk_buff *skb);
d409b847 MB	67	struct dst_entry ip6_route_input_lookup(struct net net,
	68	struct net_device *dev,
	69	struct flowi6 *fl6, int flags);
1da177e4	70
6f21c96a PA	71	struct dst_entry ip6_route_output_flags(struct net net, const struct sock *sk,
	72	struct flowi6 *fl6, int flags);
	73
	74	static inline struct dst_entry ip6_route_output(struct net net,
	75	const struct sock *sk,
	76	struct flowi6 *fl6)
	77	{
	78	return ip6_route_output_flags(net, sk, fl6, 0);
	79	}
	80
5c3a0fd7 JP	81	struct dst_entry ip6_route_lookup(struct net net, struct flowi6 *fl6,
5c3a0fd7 JP	82	int flags);
9ff74384 DA	83	struct rt6_info ip6_pol_route(struct net net, struct fib6_table *table,
9ff74384 DA	84	int ifindex, struct flowi6 *fl6, int flags);
1da177e4	85
5c3a0fd7 JP	86	int ip6_route_init(void);
5c3a0fd7 JP	87	void ip6_route_cleanup(void);
1da177e4	88
5c3a0fd7	89	int ipv6_route_ioctl(struct net net, unsigned int cmd, void __user arg);
1da177e4	90
5c3a0fd7 JP	91	int ip6_route_add(struct fib6_config *cfg);
	92	int ip6_ins_rt(struct rt6_info *);
	93	int ip6_del_rt(struct rt6_info *);
1da177e4	94
a2e2ff56 DA	95	static inline int ip6_route_get_saddr(struct net net, struct rt6_info rt,
	96	const struct in6_addr *daddr,
	97	unsigned int prefs,
	98	struct in6_addr *saddr)
	99	{
	100	struct inet6_dev *idev =
	101	rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
	102	int err = 0;
	103
	104	if (rt && rt->rt6i_prefsrc.plen)
	105	*saddr = rt->rt6i_prefsrc.addr;
	106	else
	107	err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
	108	daddr, prefs, saddr);
	109
	110	return err;
	111	}
c3968a85	112
5c3a0fd7 JP	113	struct rt6_info rt6_lookup(struct net net, const struct in6_addr *daddr,
5c3a0fd7 JP	114	const struct in6_addr *saddr, int oif, int flags);
1da177e4	115
5c3a0fd7 JP	116	struct dst_entry icmp6_dst_alloc(struct net_device dev, struct flowi6 *fl6);
5c3a0fd7 JP	117	int icmp6_dst_gc(void);
3b00944c	118
5c3a0fd7	119	void fib6_force_start_gc(struct net *net);
1da177e4	120
5c3a0fd7 JP	121	struct rt6_info addrconf_dst_alloc(struct inet6_dev idev,
5c3a0fd7 JP	122	const struct in6_addr *addr, bool anycast);
1da177e4	123
9ab179d8 DA	124	struct rt6_info ip6_dst_alloc(struct net net, struct net_device *dev,
	125	int flags);
	126
1da177e4 LT	127	/*
	128	* support functions for ND
	129	*
	130	*/
5c3a0fd7 JP	131	struct rt6_info rt6_get_dflt_router(const struct in6_addr addr,
	132	struct net_device *dev);
	133	struct rt6_info rt6_add_dflt_router(const struct in6_addr gwaddr,
	134	struct net_device *dev, unsigned int pref);
	135
	136	void rt6_purge_dflt_routers(struct net *net);
	137
	138	int rt6_route_rcv(struct net_device dev, u8 opt, int len,
	139	const struct in6_addr *gwaddr);
	140
	141	void ip6_update_pmtu(struct sk_buff skb, struct net net, __be32 mtu, int oif,
	142	u32 mark);
	143	void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu);
	144	void ip6_redirect(struct sk_buff skb, struct net net, int oif, u32 mark);
	145	void ip6_redirect_no_header(struct sk_buff skb, struct net net, int oif,
	146	u32 mark);
	147	void ip6_sk_redirect(struct sk_buff skb, struct sock sk);
1da177e4	148
1da177e4	149	struct netlink_callback;
1da177e4	150
fd2c3ef7	151	struct rt6_rtnl_dump_arg {
1b43af54 PM	152	struct sk_buff *skb;
1b43af54 PM	153	struct netlink_callback *cb;
191cd582	154	struct net *net;
1b43af54 PM	155	};
1b43af54 PM	156
5c3a0fd7 JP	157	int rt6_dump_route(struct rt6_info rt, void p_arg);
	158	void rt6_ifdown(struct net net, struct net_device dev);
	159	void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
	160	void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
be7a010d	161	void rt6_clean_tohost(struct net net, struct in6_addr gateway);
1da177e4	162
1da177e4 LT	163
	164	/*
	165	* Store a destination cache entry in a socket
	166	*/
6bd4f355 ED	167	static inline void ip6_dst_store(struct sock sk, struct dst_entry dst,
	168	const struct in6_addr *daddr,
	169	const struct in6_addr *saddr)
1da177e4 LT	170	{
1da177e4 LT	171	struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4	172
6bd4f355	173	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
f83ef8c0	174	sk_setup_caps(sk, dst);
1da177e4	175	np->daddr_cache = daddr;
8e1ef0a9 YH	176	#ifdef CONFIG_IPV6_SUBTREES
	177	np->saddr_cache = saddr;
	178	#endif
1da177e4 LT	179	}
1da177e4 LT	180
a50feda5	181	static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4	182	{
adf30907	183	struct rt6_info rt = (struct rt6_info ) skb_dst(skb);
1da177e4 LT	184
	185	return rt->rt6i_flags & RTF_LOCAL;
	186	}
	187
2647a9b0 MKL	188	static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
2647a9b0 MKL	189	const struct in6_addr *daddr)
509aba3b	190	{
2647a9b0	191	struct rt6_info rt = (struct rt6_info )dst;
509aba3b	192
2647a9b0 MKL	193	return rt->rt6i_flags & RTF_ANYCAST \|\|
	194	(rt->rt6i_dst.plen != 128 &&
	195	ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
509aba3b FLB	196	}
509aba3b FLB	197
7d8c6e39 EB	198	int ip6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
7d8c6e39 EB	199	int (output)(struct net , struct sock , struct sk_buff ));
ad0081e4 DS	200
	201	static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
	202	{
f60e5990	203	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
f60e5990	204	inet6_sk(skb->sk) : NULL;
ad0081e4	205
93b36cf3	206	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
ad0081e4 DS	207	skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
	208	}
	209
93b36cf3 HFS	210	static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
93b36cf3 HFS	211	{
0b95227a HFS	212	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
	213	inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
	214	}
	215
60ff7467	216	static inline bool ip6_sk_ignore_df(const struct sock *sk)
0b95227a HFS	217	{
	218	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO \|\|
	219	inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
93b36cf3 HFS	220	}
93b36cf3 HFS	221
2647a9b0 MKL	222	static inline struct in6_addr rt6_nexthop(struct rt6_info rt,
2647a9b0 MKL	223	struct in6_addr *daddr)
9bb5a148	224	{
2647a9b0 MKL	225	if (rt->rt6i_flags & RTF_GATEWAY)
2647a9b0 MKL	226	return &rt->rt6i_gateway;
45e4fd26	227	else if (unlikely(rt->rt6i_flags & RTF_CACHE))
2647a9b0 MKL	228	return &rt->rt6i_dst.addr;
	229	else
	230	return daddr;
9bb5a148 YH	231	}
9bb5a148 YH	232
1da177e4	233	#endif