[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/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 *);

void rt6_flush_exceptions(struct rt6_info *rt);
int rt6_remove_exception_rt(struct rt6_info *rt);

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);
u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb);

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);

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
}

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 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
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>
f06b7549	25	#include <net/lwtunnel.h>
1da177e4 LT	26	#include <linux/ip.h>
1da177e4 LT	27	#include <linux/ipv6.h>
9bb5a148	28	#include <linux/route.h>
1da177e4	29
7cbca67c YH	30	#define RT6_LOOKUP_F_IFACE 0x00000001
	31	#define RT6_LOOKUP_F_REACHABLE 0x00000002
	32	#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
	33	#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
	34	#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
	35	#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
d5d32e4b	36	#define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
77d16f45	37
30f78d8e ED	38	/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
	39	* Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
	40	*/
	41	#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
	42
0c9a2ac1 YH	43	/*
	44	* rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
	45	* between IPV6_ADDR_PREFERENCES socket option values
	46	* IPV6_PREFER_SRC_TMP = 0x1
	47	* IPV6_PREFER_SRC_PUBLIC = 0x2
	48	* IPV6_PREFER_SRC_COA = 0x4
	49	* and above RT6_LOOKUP_F_SRCPREF_xxx flags.
	50	*/
	51	static inline int rt6_srcprefs2flags(unsigned int srcprefs)
	52	{
	53	/* No need to bitmask because srcprefs have only 3 bits. */
	54	return srcprefs << 3;
	55	}
	56
	57	static inline unsigned int rt6_flags2srcprefs(int flags)
	58	{
	59	return (flags >> 3) & 7;
	60	}
1da177e4	61
60ea37f7 WY	62	static inline bool rt6_need_strict(const struct in6_addr *daddr)
	63	{
	64	return ipv6_addr_type(daddr) &
	65	(IPV6_ADDR_MULTICAST \| IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_LOOPBACK);
	66	}
fbfe95a4	67
5c3a0fd7	68	void ip6_route_input(struct sk_buff *skb);
d409b847 MB	69	struct dst_entry ip6_route_input_lookup(struct net net,
	70	struct net_device *dev,
	71	struct flowi6 *fl6, int flags);
1da177e4	72
6f21c96a PA	73	struct dst_entry ip6_route_output_flags(struct net net, const struct sock *sk,
	74	struct flowi6 *fl6, int flags);
	75
	76	static inline struct dst_entry ip6_route_output(struct net net,
	77	const struct sock *sk,
	78	struct flowi6 *fl6)
	79	{
	80	return ip6_route_output_flags(net, sk, fl6, 0);
	81	}
	82
5c3a0fd7 JP	83	struct dst_entry ip6_route_lookup(struct net net, struct flowi6 *fl6,
5c3a0fd7 JP	84	int flags);
9ff74384 DA	85	struct rt6_info ip6_pol_route(struct net net, struct fib6_table *table,
9ff74384 DA	86	int ifindex, struct flowi6 *fl6, int flags);
1da177e4	87
2f460933	88	void ip6_route_init_special_entries(void);
5c3a0fd7 JP	89	int ip6_route_init(void);
5c3a0fd7 JP	90	void ip6_route_cleanup(void);
1da177e4	91
5c3a0fd7	92	int ipv6_route_ioctl(struct net net, unsigned int cmd, void __user arg);
1da177e4	93
333c4301	94	int ip6_route_add(struct fib6_config cfg, struct netlink_ext_ack extack);
5c3a0fd7 JP	95	int ip6_ins_rt(struct rt6_info *);
5c3a0fd7 JP	96	int ip6_del_rt(struct rt6_info *);
1da177e4	97
35732d01 WW	98	void rt6_flush_exceptions(struct rt6_info *rt);
	99	int rt6_remove_exception_rt(struct rt6_info *rt);
	100
a2e2ff56 DA	101	static inline int ip6_route_get_saddr(struct net net, struct rt6_info rt,
	102	const struct in6_addr *daddr,
	103	unsigned int prefs,
	104	struct in6_addr *saddr)
	105	{
	106	struct inet6_dev *idev =
	107	rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
	108	int err = 0;
	109
	110	if (rt && rt->rt6i_prefsrc.plen)
	111	*saddr = rt->rt6i_prefsrc.addr;
	112	else
	113	err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
	114	daddr, prefs, saddr);
	115
	116	return err;
	117	}
c3968a85	118
5c3a0fd7 JP	119	struct rt6_info rt6_lookup(struct net net, const struct in6_addr *daddr,
5c3a0fd7 JP	120	const struct in6_addr *saddr, int oif, int flags);
23aebdac	121	u32 rt6_multipath_hash(const struct flowi6 fl6, const struct sk_buff skb);
1da177e4	122
5c3a0fd7	123	struct dst_entry icmp6_dst_alloc(struct net_device dev, struct flowi6 *fl6);
3b00944c	124
5c3a0fd7	125	void fib6_force_start_gc(struct net *net);
1da177e4	126
5c3a0fd7 JP	127	struct rt6_info addrconf_dst_alloc(struct inet6_dev idev,
5c3a0fd7 JP	128	const struct in6_addr *addr, bool anycast);
1da177e4	129
9ab179d8 DA	130	struct rt6_info ip6_dst_alloc(struct net net, struct net_device *dev,
	131	int flags);
	132
1da177e4 LT	133	/*
	134	* support functions for ND
	135	*
	136	*/
5c3a0fd7 JP	137	struct rt6_info rt6_get_dflt_router(const struct in6_addr addr,
	138	struct net_device *dev);
	139	struct rt6_info rt6_add_dflt_router(const struct in6_addr gwaddr,
	140	struct net_device *dev, unsigned int pref);
	141
	142	void rt6_purge_dflt_routers(struct net *net);
	143
	144	int rt6_route_rcv(struct net_device dev, u8 opt, int len,
	145	const struct in6_addr *gwaddr);
	146
	147	void ip6_update_pmtu(struct sk_buff skb, struct net net, __be32 mtu, int oif,
e2d118a1	148	u32 mark, kuid_t uid);
5c3a0fd7	149	void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu);
e2d118a1 LC	150	void ip6_redirect(struct sk_buff skb, struct net net, int oif, u32 mark,
e2d118a1 LC	151	kuid_t uid);
5c3a0fd7 JP	152	void ip6_redirect_no_header(struct sk_buff skb, struct net net, int oif,
	153	u32 mark);
	154	void ip6_sk_redirect(struct sk_buff skb, struct sock sk);
1da177e4	155
1da177e4	156	struct netlink_callback;
1da177e4	157
fd2c3ef7	158	struct rt6_rtnl_dump_arg {
1b43af54 PM	159	struct sk_buff *skb;
1b43af54 PM	160	struct netlink_callback *cb;
191cd582	161	struct net *net;
1b43af54 PM	162	};
1b43af54 PM	163
5c3a0fd7 JP	164	int rt6_dump_route(struct rt6_info rt, void p_arg);
	165	void rt6_ifdown(struct net net, struct net_device dev);
	166	void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
	167	void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
be7a010d	168	void rt6_clean_tohost(struct net net, struct in6_addr gateway);
1da177e4	169
1b70d792 DA	170	static inline const struct rt6_info skb_rt6_info(const struct sk_buff skb)
	171	{
	172	const struct dst_entry *dst = skb_dst(skb);
	173	const struct rt6_info *rt6 = NULL;
	174
	175	if (dst)
	176	rt6 = container_of(dst, struct rt6_info, dst);
	177
	178	return rt6;
	179	}
1da177e4 LT	180
	181	/*
	182	* Store a destination cache entry in a socket
	183	*/
6bd4f355 ED	184	static inline void ip6_dst_store(struct sock sk, struct dst_entry dst,
	185	const struct in6_addr *daddr,
	186	const struct in6_addr *saddr)
1da177e4 LT	187	{
1da177e4 LT	188	struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4	189
6bd4f355	190	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
f83ef8c0	191	sk_setup_caps(sk, dst);
1da177e4	192	np->daddr_cache = daddr;
8e1ef0a9 YH	193	#ifdef CONFIG_IPV6_SUBTREES
	194	np->saddr_cache = saddr;
	195	#endif
1da177e4 LT	196	}
1da177e4 LT	197
a50feda5	198	static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4	199	{
adf30907	200	struct rt6_info rt = (struct rt6_info ) skb_dst(skb);
1da177e4 LT	201
	202	return rt->rt6i_flags & RTF_LOCAL;
	203	}
	204
2647a9b0 MKL	205	static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
2647a9b0 MKL	206	const struct in6_addr *daddr)
509aba3b	207	{
2647a9b0	208	struct rt6_info rt = (struct rt6_info )dst;
509aba3b	209
2647a9b0	210	return rt->rt6i_flags & RTF_ANYCAST \|\|
ccdb2d17	211	(rt->rt6i_dst.plen < 127 &&
2647a9b0	212	ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
509aba3b FLB	213	}
509aba3b FLB	214
7d8c6e39 EB	215	int ip6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
7d8c6e39 EB	216	int (output)(struct net , struct sock , struct sk_buff ));
ad0081e4 DS	217
	218	static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
	219	{
f60e5990	220	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
f60e5990	221	inet6_sk(skb->sk) : NULL;
ad0081e4	222
93b36cf3	223	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
ad0081e4 DS	224	skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
	225	}
	226
93b36cf3 HFS	227	static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
93b36cf3 HFS	228	{
0b95227a HFS	229	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
	230	inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
	231	}
	232
60ff7467	233	static inline bool ip6_sk_ignore_df(const struct sock *sk)
0b95227a HFS	234	{
	235	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO \|\|
	236	inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
93b36cf3 HFS	237	}
93b36cf3 HFS	238
2647a9b0 MKL	239	static inline struct in6_addr rt6_nexthop(struct rt6_info rt,
2647a9b0 MKL	240	struct in6_addr *daddr)
9bb5a148	241	{
2647a9b0 MKL	242	if (rt->rt6i_flags & RTF_GATEWAY)
2647a9b0 MKL	243	return &rt->rt6i_gateway;
45e4fd26	244	else if (unlikely(rt->rt6i_flags & RTF_CACHE))
2647a9b0 MKL	245	return &rt->rt6i_dst.addr;
	246	else
	247	return daddr;
9bb5a148 YH	248	}
9bb5a148 YH	249
f06b7549 DA	250	static inline bool rt6_duplicate_nexthop(struct rt6_info a, struct rt6_info b)
	251	{
	252	return a->dst.dev == b->dst.dev &&
	253	a->rt6i_idev == b->rt6i_idev &&
	254	ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
	255	!lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
	256	}
1da177e4	257	#endif