[people/arne_f/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];	/* 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 *);

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
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;
70ceb4f5 YH	19	__u8 prefix[0]; /* 0,8 or 16 */
	20	};
	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>
1da177e4	30
7cbca67c YH	31	#define RT6_LOOKUP_F_IFACE 0x00000001
	32	#define RT6_LOOKUP_F_REACHABLE 0x00000002
	33	#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
	34	#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
	35	#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
	36	#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
d5d32e4b	37	#define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
77d16f45	38
30f78d8e ED	39	/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
	40	* Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
	41	*/
	42	#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
	43
0c9a2ac1 YH	44	/*
	45	* rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
	46	* between IPV6_ADDR_PREFERENCES socket option values
	47	* IPV6_PREFER_SRC_TMP = 0x1
	48	* IPV6_PREFER_SRC_PUBLIC = 0x2
	49	* IPV6_PREFER_SRC_COA = 0x4
	50	* and above RT6_LOOKUP_F_SRCPREF_xxx flags.
	51	*/
	52	static inline int rt6_srcprefs2flags(unsigned int srcprefs)
	53	{
	54	/* No need to bitmask because srcprefs have only 3 bits. */
	55	return srcprefs << 3;
	56	}
	57
	58	static inline unsigned int rt6_flags2srcprefs(int flags)
	59	{
	60	return (flags >> 3) & 7;
	61	}
1da177e4	62
60ea37f7 WY	63	static inline bool rt6_need_strict(const struct in6_addr *daddr)
	64	{
	65	return ipv6_addr_type(daddr) &
	66	(IPV6_ADDR_MULTICAST \| IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_LOOPBACK);
	67	}
fbfe95a4	68
5c3a0fd7	69	void ip6_route_input(struct sk_buff *skb);
d409b847 MB	70	struct dst_entry ip6_route_input_lookup(struct net net,
	71	struct net_device *dev,
	72	struct flowi6 *fl6, int flags);
1da177e4	73
6f21c96a PA	74	struct dst_entry ip6_route_output_flags(struct net net, const struct sock *sk,
	75	struct flowi6 *fl6, int flags);
	76
	77	static inline struct dst_entry ip6_route_output(struct net net,
	78	const struct sock *sk,
	79	struct flowi6 *fl6)
	80	{
	81	return ip6_route_output_flags(net, sk, fl6, 0);
	82	}
	83
5c3a0fd7 JP	84	struct dst_entry ip6_route_lookup(struct net net, struct flowi6 *fl6,
5c3a0fd7 JP	85	int flags);
9ff74384 DA	86	struct rt6_info ip6_pol_route(struct net net, struct fib6_table *table,
9ff74384 DA	87	int ifindex, struct flowi6 *fl6, int flags);
1da177e4	88
2f460933	89	void ip6_route_init_special_entries(void);
5c3a0fd7 JP	90	int ip6_route_init(void);
5c3a0fd7 JP	91	void ip6_route_cleanup(void);
1da177e4	92
5c3a0fd7	93	int ipv6_route_ioctl(struct net net, unsigned int cmd, void __user arg);
1da177e4	94
333c4301	95	int ip6_route_add(struct fib6_config cfg, struct netlink_ext_ack extack);
5c3a0fd7 JP	96	int ip6_ins_rt(struct rt6_info *);
5c3a0fd7 JP	97	int ip6_del_rt(struct rt6_info *);
1da177e4	98
a2e2ff56 DA	99	static inline int ip6_route_get_saddr(struct net net, struct rt6_info rt,
	100	const struct in6_addr *daddr,
	101	unsigned int prefs,
	102	struct in6_addr *saddr)
	103	{
	104	struct inet6_dev *idev =
	105	rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
	106	int err = 0;
	107
	108	if (rt && rt->rt6i_prefsrc.plen)
	109	*saddr = rt->rt6i_prefsrc.addr;
	110	else
	111	err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
	112	daddr, prefs, saddr);
	113
	114	return err;
	115	}
c3968a85	116
5c3a0fd7 JP	117	struct rt6_info rt6_lookup(struct net net, const struct in6_addr *daddr,
5c3a0fd7 JP	118	const struct in6_addr *saddr, int oif, int flags);
23aebdac	119	u32 rt6_multipath_hash(const struct flowi6 fl6, const struct sk_buff skb);
1da177e4	120
5c3a0fd7	121	struct dst_entry icmp6_dst_alloc(struct net_device dev, struct flowi6 *fl6);
3b00944c	122
5c3a0fd7	123	void fib6_force_start_gc(struct net *net);
1da177e4	124
5c3a0fd7 JP	125	struct rt6_info addrconf_dst_alloc(struct inet6_dev idev,
5c3a0fd7 JP	126	const struct in6_addr *addr, bool anycast);
1da177e4	127
9ab179d8 DA	128	struct rt6_info ip6_dst_alloc(struct net net, struct net_device *dev,
	129	int flags);
	130
1da177e4 LT	131	/*
	132	* support functions for ND
	133	*
	134	*/
5c3a0fd7 JP	135	struct rt6_info rt6_get_dflt_router(const struct in6_addr addr,
	136	struct net_device *dev);
	137	struct rt6_info rt6_add_dflt_router(const struct in6_addr gwaddr,
	138	struct net_device *dev, unsigned int pref);
	139
	140	void rt6_purge_dflt_routers(struct net *net);
	141
	142	int rt6_route_rcv(struct net_device dev, u8 opt, int len,
	143	const struct in6_addr *gwaddr);
	144
	145	void ip6_update_pmtu(struct sk_buff skb, struct net net, __be32 mtu, int oif,
e2d118a1	146	u32 mark, kuid_t uid);
5c3a0fd7	147	void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu);
e2d118a1 LC	148	void ip6_redirect(struct sk_buff skb, struct net net, int oif, u32 mark,
e2d118a1 LC	149	kuid_t uid);
5c3a0fd7 JP	150	void ip6_redirect_no_header(struct sk_buff skb, struct net net, int oif,
	151	u32 mark);
	152	void ip6_sk_redirect(struct sk_buff skb, struct sock sk);
1da177e4	153
1da177e4	154	struct netlink_callback;
1da177e4	155
fd2c3ef7	156	struct rt6_rtnl_dump_arg {
1b43af54 PM	157	struct sk_buff *skb;
1b43af54 PM	158	struct netlink_callback *cb;
191cd582	159	struct net *net;
1b43af54 PM	160	};
1b43af54 PM	161
5c3a0fd7 JP	162	int rt6_dump_route(struct rt6_info rt, void p_arg);
	163	void rt6_ifdown(struct net net, struct net_device dev);
	164	void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
	165	void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
be7a010d	166	void rt6_clean_tohost(struct net net, struct in6_addr gateway);
1da177e4	167
1b70d792 DA	168	static inline const struct rt6_info skb_rt6_info(const struct sk_buff skb)
	169	{
	170	const struct dst_entry *dst = skb_dst(skb);
	171	const struct rt6_info *rt6 = NULL;
	172
	173	if (dst)
	174	rt6 = container_of(dst, struct rt6_info, dst);
	175
	176	return rt6;
	177	}
1da177e4 LT	178
	179	/*
	180	* Store a destination cache entry in a socket
	181	*/
6bd4f355 ED	182	static inline void ip6_dst_store(struct sock sk, struct dst_entry dst,
	183	const struct in6_addr *daddr,
	184	const struct in6_addr *saddr)
1da177e4 LT	185	{
1da177e4 LT	186	struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4	187
6bd4f355	188	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
f83ef8c0	189	sk_setup_caps(sk, dst);
1da177e4	190	np->daddr_cache = daddr;
8e1ef0a9 YH	191	#ifdef CONFIG_IPV6_SUBTREES
	192	np->saddr_cache = saddr;
	193	#endif
1da177e4 LT	194	}
1da177e4 LT	195
a50feda5	196	static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4	197	{
adf30907	198	struct rt6_info rt = (struct rt6_info ) skb_dst(skb);
1da177e4 LT	199
	200	return rt->rt6i_flags & RTF_LOCAL;
	201	}
	202
2647a9b0 MKL	203	static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
2647a9b0 MKL	204	const struct in6_addr *daddr)
509aba3b	205	{
2647a9b0	206	struct rt6_info rt = (struct rt6_info )dst;
509aba3b	207
2647a9b0	208	return rt->rt6i_flags & RTF_ANYCAST \|\|
ccdb2d17	209	(rt->rt6i_dst.plen < 127 &&
2647a9b0	210	ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
509aba3b FLB	211	}
509aba3b FLB	212
7d8c6e39 EB	213	int ip6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
7d8c6e39 EB	214	int (output)(struct net , struct sock , struct sk_buff ));
ad0081e4 DS	215
	216	static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
	217	{
f60e5990	218	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
f60e5990	219	inet6_sk(skb->sk) : NULL;
ad0081e4	220
93b36cf3	221	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
ad0081e4 DS	222	skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
	223	}
	224
93b36cf3 HFS	225	static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
93b36cf3 HFS	226	{
0b95227a HFS	227	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
	228	inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
	229	}
	230
60ff7467	231	static inline bool ip6_sk_ignore_df(const struct sock *sk)
0b95227a HFS	232	{
	233	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO \|\|
	234	inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
93b36cf3 HFS	235	}
93b36cf3 HFS	236
2647a9b0 MKL	237	static inline struct in6_addr rt6_nexthop(struct rt6_info rt,
2647a9b0 MKL	238	struct in6_addr *daddr)
9bb5a148	239	{
2647a9b0 MKL	240	if (rt->rt6i_flags & RTF_GATEWAY)
2647a9b0 MKL	241	return &rt->rt6i_gateway;
45e4fd26	242	else if (unlikely(rt->rt6i_flags & RTF_CACHE))
2647a9b0 MKL	243	return &rt->rt6i_dst.addr;
	244	else
	245	return daddr;
9bb5a148 YH	246	}
9bb5a148 YH	247
f06b7549 DA	248	static inline bool rt6_duplicate_nexthop(struct rt6_info a, struct rt6_info b)
	249	{
	250	return a->dst.dev == b->dst.dev &&
	251	a->rt6i_idev == b->rt6i_idev &&
	252	ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
	253	!lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
	254	}
1da177e4	255	#endif