[linux-block.git] / include / net / route.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET  is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the IP router.
 *
 * Version:	@(#)route.h	1.0.4	05/27/93
 *
 * Authors:	Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 * Fixes:
 *		Alan Cox	:	Reformatted. Added ip_rt_local()
 *		Alan Cox	:	Support for TCP parameters.
 *		Alexey Kuznetsov:	Major changes for new routing code.
 *		Mike McLagan    :	Routing by source
 *		Robert Olsson   :	Added rt_cache statistics
 */
#ifndef _ROUTE_H
#define _ROUTE_H

#include <net/dst.h>
#include <net/inetpeer.h>
#include <net/flow.h>
#include <net/inet_sock.h>
#include <net/ip_fib.h>
#include <net/arp.h>
#include <net/ndisc.h>
#include <linux/in_route.h>
#include <linux/rtnetlink.h>
#include <linux/rcupdate.h>
#include <linux/route.h>
#include <linux/ip.h>
#include <linux/cache.h>
#include <linux/security.h>

/* IPv4 datagram length is stored into 16bit field (tot_len) */
#define IP_MAX_MTU	0xFFFFU

#define RTO_ONLINK	0x01

#define RT_CONN_FLAGS(sk)   (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
#define RT_CONN_FLAGS_TOS(sk,tos)   (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))

struct ip_tunnel_info;
struct fib_nh;
struct fib_info;
struct uncached_list;
struct rtable {
	struct dst_entry	dst;

	int			rt_genid;
	unsigned int		rt_flags;
	__u16			rt_type;
	__u8			rt_is_input;
	__u8			rt_uses_gateway;

	int			rt_iif;

	u8			rt_gw_family;
	/* Info on neighbour */
	union {
		__be32		rt_gw4;
		struct in6_addr	rt_gw6;
	};

	/* Miscellaneous cached information */
	u32			rt_mtu_locked:1,
				rt_pmtu:31;

	struct list_head	rt_uncached;
	struct uncached_list	*rt_uncached_list;
};

static inline bool rt_is_input_route(const struct rtable *rt)
{
	return rt->rt_is_input != 0;
}

static inline bool rt_is_output_route(const struct rtable *rt)
{
	return rt->rt_is_input == 0;
}

static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
{
	if (rt->rt_gw_family == AF_INET)
		return rt->rt_gw4;
	return daddr;
}

struct ip_rt_acct {
	__u32 	o_bytes;
	__u32 	o_packets;
	__u32 	i_bytes;
	__u32 	i_packets;
};

struct rt_cache_stat {
        unsigned int in_slow_tot;
        unsigned int in_slow_mc;
        unsigned int in_no_route;
        unsigned int in_brd;
        unsigned int in_martian_dst;
        unsigned int in_martian_src;
        unsigned int out_slow_tot;
        unsigned int out_slow_mc;
};

extern struct ip_rt_acct __percpu *ip_rt_acct;

struct in_device;

int ip_rt_init(void);
void rt_cache_flush(struct net *net);
void rt_flush_dev(struct net_device *dev);
struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
					const struct sk_buff *skb);
struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
					    struct fib_result *res,
					    const struct sk_buff *skb);

static inline struct rtable *__ip_route_output_key(struct net *net,
						   struct flowi4 *flp)
{
	return ip_route_output_key_hash(net, flp, NULL);
}

struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
				    const struct sock *sk);
struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
				      struct net_device *dev,
				      struct net *net, __be32 *saddr,
				      const struct ip_tunnel_info *info,
				      u8 protocol, bool use_cache);

struct dst_entry *ipv4_blackhole_route(struct net *net,
				       struct dst_entry *dst_orig);

static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
{
	return ip_route_output_flow(net, flp, NULL);
}

static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
					     __be32 saddr, u8 tos, int oif)
{
	struct flowi4 fl4 = {
		.flowi4_oif = oif,
		.flowi4_tos = tos,
		.daddr = daddr,
		.saddr = saddr,
	};
	return ip_route_output_key(net, &fl4);
}

static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
						   struct sock *sk,
						   __be32 daddr, __be32 saddr,
						   __be16 dport, __be16 sport,
						   __u8 proto, __u8 tos, int oif)
{
	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
			   RT_SCOPE_UNIVERSE, proto,
			   sk ? inet_sk_flowi_flags(sk) : 0,
			   daddr, saddr, dport, sport, sock_net_uid(net, sk));
	if (sk)
		security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
	return ip_route_output_flow(net, fl4, sk);
}

static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
						 __be32 daddr, __be32 saddr,
						 __be32 gre_key, __u8 tos, int oif)
{
	memset(fl4, 0, sizeof(*fl4));
	fl4->flowi4_oif = oif;
	fl4->daddr = daddr;
	fl4->saddr = saddr;
	fl4->flowi4_tos = tos;
	fl4->flowi4_proto = IPPROTO_GRE;
	fl4->fl4_gre_key = gre_key;
	return ip_route_output_key(net, fl4);
}
int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
			  u8 tos, struct net_device *dev,
			  struct in_device *in_dev, u32 *itag);
int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
			 u8 tos, struct net_device *devin);
int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
		       u8 tos, struct net_device *devin,
		       struct fib_result *res);

int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
		      u8 tos, struct net_device *devin,
		      const struct sk_buff *hint);

static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
				 u8 tos, struct net_device *devin)
{
	int err;

	rcu_read_lock();
	err = ip_route_input_noref(skb, dst, src, tos, devin);
	if (!err) {
		skb_dst_force(skb);
		if (!skb_dst(skb))
			err = -EINVAL;
	}
	rcu_read_unlock();

	return err;
}

void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
		      u8 protocol);
void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
void ip_rt_send_redirect(struct sk_buff *skb);

unsigned int inet_addr_type(struct net *net, __be32 addr);
unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
				__be32 addr);
unsigned int inet_addr_type_dev_table(struct net *net,
				      const struct net_device *dev,
				      __be32 addr);
void ip_rt_multicast_event(struct in_device *);
int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
struct rtable *rt_dst_alloc(struct net_device *dev,
			     unsigned int flags, u16 type,
			     bool nopolicy, bool noxfrm);
struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);

struct in_ifaddr;
void fib_add_ifaddr(struct in_ifaddr *);
void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);

void rt_add_uncached_list(struct rtable *rt);
void rt_del_uncached_list(struct rtable *rt);

int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
		       u32 table_id, struct fib_info *fi,
		       int *fa_index, int fa_start, unsigned int flags);

static inline void ip_rt_put(struct rtable *rt)
{
	/* dst_release() accepts a NULL parameter.
	 * We rely on dst being first structure in struct rtable
	 */
	BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
	dst_release(&rt->dst);
}

#define IPTOS_RT_MASK	(IPTOS_TOS_MASK & ~3)

extern const __u8 ip_tos2prio[16];

static inline char rt_tos2priority(u8 tos)
{
	return ip_tos2prio[IPTOS_TOS(tos)>>1];
}

/* ip_route_connect() and ip_route_newports() work in tandem whilst
 * binding a socket for a new outgoing connection.
 *
 * In order to use IPSEC properly, we must, in the end, have a
 * route that was looked up using all available keys including source
 * and destination ports.
 *
 * However, if a source port needs to be allocated (the user specified
 * a wildcard source port) we need to obtain addressing information
 * in order to perform that allocation.
 *
 * So ip_route_connect() looks up a route using wildcarded source and
 * destination ports in the key, simply so that we can get a pair of
 * addresses to use for port allocation.
 *
 * Later, once the ports are allocated, ip_route_newports() will make
 * another route lookup if needed to make sure we catch any IPSEC
 * rules keyed on the port information.
 *
 * The callers allocate the flow key on their stack, and must pass in
 * the same flowi4 object to both the ip_route_connect() and the
 * ip_route_newports() calls.
 */

static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
					 u32 tos, int oif, u8 protocol,
					 __be16 sport, __be16 dport,
					 struct sock *sk)
{
	__u8 flow_flags = 0;

	if (inet_sk(sk)->transparent)
		flow_flags |= FLOWI_FLAG_ANYSRC;

	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
			   protocol, flow_flags, dst, src, dport, sport,
			   sk->sk_uid);
}

static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
					      __be32 dst, __be32 src, u32 tos,
					      int oif, u8 protocol,
					      __be16 sport, __be16 dport,
					      struct sock *sk)
{
	struct net *net = sock_net(sk);
	struct rtable *rt;

	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
			      sport, dport, sk);

	if (!dst || !src) {
		rt = __ip_route_output_key(net, fl4);
		if (IS_ERR(rt))
			return rt;
		ip_rt_put(rt);
		flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
	}
	security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
	return ip_route_output_flow(net, fl4, sk);
}

static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
					       __be16 orig_sport, __be16 orig_dport,
					       __be16 sport, __be16 dport,
					       struct sock *sk)
{
	if (sport != orig_sport || dport != orig_dport) {
		fl4->fl4_dport = dport;
		fl4->fl4_sport = sport;
		ip_rt_put(rt);
		flowi4_update_output(fl4, sk->sk_bound_dev_if,
				     RT_CONN_FLAGS(sk), fl4->daddr,
				     fl4->saddr);
		security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
		return ip_route_output_flow(sock_net(sk), fl4, sk);
	}
	return rt;
}

static inline int inet_iif(const struct sk_buff *skb)
{
	struct rtable *rt = skb_rtable(skb);

	if (rt && rt->rt_iif)
		return rt->rt_iif;

	return skb->skb_iif;
}

static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
{
	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	struct net *net = dev_net(dst->dev);

	if (hoplimit == 0)
		hoplimit = net->ipv4.sysctl_ip_default_ttl;
	return hoplimit;
}

static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
					     __be32 daddr)
{
	struct neighbour *neigh;

	neigh = __ipv4_neigh_lookup_noref(dev, daddr);
	if (unlikely(!neigh))
		neigh = __neigh_create(&arp_tbl, &daddr, dev, false);

	return neigh;
}

static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
						struct sk_buff *skb,
						bool *is_v6gw)
{
	struct net_device *dev = rt->dst.dev;
	struct neighbour *neigh;

	if (likely(rt->rt_gw_family == AF_INET)) {
		neigh = ip_neigh_gw4(dev, rt->rt_gw4);
	} else if (rt->rt_gw_family == AF_INET6) {
		neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
		*is_v6gw = true;
	} else {
		neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
	}
	return neigh;
}

#endif	/* _ROUTE_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* Definitions for the IP router.
	8	*
	9	* Version: @(#)route.h 1.0.4 05/27/93
	10	*
02c30a84	11	* Authors: Ross Biro
1da177e4 LT	12	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	13	* Fixes:
	14	* Alan Cox : Reformatted. Added ip_rt_local()
	15	* Alan Cox : Support for TCP parameters.
	16	* Alexey Kuznetsov: Major changes for new routing code.
	17	* Mike McLagan : Routing by source
	18	* Robert Olsson : Added rt_cache statistics
1da177e4 LT	19	*/
	20	#ifndef _ROUTE_H
	21	#define _ROUTE_H
	22
1da177e4 LT	23	#include <net/dst.h>
	24	#include <net/inetpeer.h>
	25	#include <net/flow.h>
79876874	26	#include <net/inet_sock.h>
79a13159	27	#include <net/ip_fib.h>
5c9f7c1d DA	28	#include <net/arp.h>
5c9f7c1d DA	29	#include <net/ndisc.h>
1da177e4 LT	30	#include <linux/in_route.h>
1da177e4 LT	31	#include <linux/rtnetlink.h>
c6cffba4	32	#include <linux/rcupdate.h>
1da177e4 LT	33	#include <linux/route.h>
	34	#include <linux/ip.h>
	35	#include <linux/cache.h>
beb8d13b	36	#include <linux/security.h>
1da177e4	37
f87c10a8 HFS	38	/* IPv4 datagram length is stored into 16bit field (tot_len) */
	39	#define IP_MAX_MTU 0xFFFFU
	40
1da177e4 LT	41	#define RTO_ONLINK 0x01
1da177e4 LT	42
1da177e4	43	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
aa661581	44	#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) \| sock_flag(sk, SOCK_LOCALROUTE))
1da177e4	45
b6459415	46	struct ip_tunnel_info;
1da177e4	47	struct fib_nh;
62fa8a84	48	struct fib_info;
5055c371	49	struct uncached_list;
fd2c3ef7	50	struct rtable {
d8d1f30b	51	struct dst_entry dst;
1da177e4	52
29e75252	53	int rt_genid;
95c96174	54	unsigned int rt_flags;
1da177e4	55	__u16 rt_type;
155e8336	56	__u8 rt_is_input;
77d5bc7e	57	__u8 rt_uses_gateway;
1da177e4	58
1da177e4 LT	59	int rt_iif;
1da177e4 LT	60
77d5bc7e	61	u8 rt_gw_family;
1da177e4	62	/* Info on neighbour */
0f5f7d7b DA	63	union {
	64	__be32 rt_gw4;
	65	struct in6_addr rt_gw6;
	66	};
1da177e4	67
1da177e4	68	/* Miscellaneous cached information */
d52e5a7e SD	69	u32 rt_mtu_locked:1,
d52e5a7e SD	70	rt_pmtu:31;
caacf05e DM	71
caacf05e DM	72	struct list_head rt_uncached;
5055c371	73	struct uncached_list *rt_uncached_list;
1da177e4 LT	74	};
1da177e4 LT	75
b8400f37	76	static inline bool rt_is_input_route(const struct rtable *rt)
c7537967	77	{
9917e1e8	78	return rt->rt_is_input != 0;
c7537967 DM	79	}
c7537967 DM	80
b8400f37	81	static inline bool rt_is_output_route(const struct rtable *rt)
c7537967	82	{
9917e1e8	83	return rt->rt_is_input == 0;
c7537967 DM	84	}
c7537967 DM	85
f8126f1d DM	86	static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
f8126f1d DM	87	{
1550c171 DA	88	if (rt->rt_gw_family == AF_INET)
1550c171 DA	89	return rt->rt_gw4;
f8126f1d DM	90	return daddr;
	91	}
	92
fd2c3ef7	93	struct ip_rt_acct {
1da177e4 LT	94	__u32 o_bytes;
	95	__u32 o_packets;
	96	__u32 i_bytes;
	97	__u32 i_packets;
	98	};
	99
fd2c3ef7	100	struct rt_cache_stat {
1da177e4 LT	101	unsigned int in_slow_tot;
	102	unsigned int in_slow_mc;
	103	unsigned int in_no_route;
	104	unsigned int in_brd;
	105	unsigned int in_martian_dst;
	106	unsigned int in_martian_src;
1da177e4 LT	107	unsigned int out_slow_tot;
1da177e4 LT	108	unsigned int out_slow_mc;
1da177e4 LT	109	};
1da177e4 LT	110
7d720c3e	111	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	112
1da177e4 LT	113	struct in_device;
2702c4bb JP	114
	115	int ip_rt_init(void);
	116	void rt_cache_flush(struct net *net);
	117	void rt_flush_dev(struct net_device *dev);
3abd1ade DA	118	struct rtable ip_route_output_key_hash(struct net net, struct flowi4 *flp,
	119	const struct sk_buff *skb);
	120	struct rtable ip_route_output_key_hash_rcu(struct net net, struct flowi4 *flp,
	121	struct fib_result *res,
	122	const struct sk_buff *skb);
79a13159 PN	123
	124	static inline struct rtable __ip_route_output_key(struct net net,
	125	struct flowi4 *flp)
	126	{
3abd1ade	127	return ip_route_output_key_hash(net, flp, NULL);
79a13159 PN	128	}
79a13159 PN	129
2702c4bb	130	struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
6f9c9615	131	const struct sock *sk);
571912c6 MV	132	struct rtable ip_route_output_tunnel(struct sk_buff skb,
	133	struct net_device *dev,
	134	struct net net, __be32 saddr,
	135	const struct ip_tunnel_info *info,
	136	u8 protocol, bool use_cache);
	137
2702c4bb JP	138	struct dst_entry ipv4_blackhole_route(struct net net,
2702c4bb JP	139	struct dst_entry *dst_orig);
407eadd9	140
9d6ec938	141	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	142	{
	143	return ip_route_output_flow(net, flp, NULL);
	144	}
	145
78fbfd8a DM	146	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	147	__be32 saddr, u8 tos, int oif)
	148	{
9d6ec938 DM	149	struct flowi4 fl4 = {
9d6ec938 DM	150	.flowi4_oif = oif,
c5d21c4b	151	.flowi4_tos = tos,
9d6ec938 DM	152	.daddr = daddr,
9d6ec938 DM	153	.saddr = saddr,
78fbfd8a	154	};
9d6ec938	155	return ip_route_output_key(net, &fl4);
78fbfd8a DM	156	}
78fbfd8a DM	157
31e4543d DM	158	static inline struct rtable ip_route_output_ports(struct net net, struct flowi4 *fl4,
31e4543d DM	159	struct sock *sk,
78fbfd8a DM	160	__be32 daddr, __be32 saddr,
	161	__be16 dport, __be16 sport,
	162	__u8 proto, __u8 tos, int oif)
	163	{
31e4543d	164	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
94b92b88 DM	165	RT_SCOPE_UNIVERSE, proto,
94b92b88 DM	166	sk ? inet_sk_flowi_flags(sk) : 0,
e2d118a1	167	daddr, saddr, dport, sport, sock_net_uid(net, sk));
78fbfd8a	168	if (sk)
3df98d79	169	security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
31e4543d	170	return ip_route_output_flow(net, fl4, sk);
78fbfd8a DM	171	}
78fbfd8a DM	172
cbb1e85f	173	static inline struct rtable ip_route_output_gre(struct net net, struct flowi4 *fl4,
78fbfd8a DM	174	__be32 daddr, __be32 saddr,
	175	__be32 gre_key, __u8 tos, int oif)
	176	{
cbb1e85f DM	177	memset(fl4, 0, sizeof(*fl4));
	178	fl4->flowi4_oif = oif;
	179	fl4->daddr = daddr;
	180	fl4->saddr = saddr;
	181	fl4->flowi4_tos = tos;
	182	fl4->flowi4_proto = IPPROTO_GRE;
	183	fl4->fl4_gre_key = gre_key;
	184	return ip_route_output_key(net, fl4);
78fbfd8a	185	}
bc044e8d PA	186	int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
	187	u8 tos, struct net_device *dev,
	188	struct in_device in_dev, u32 itag);
2702c4bb JP	189	int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
2702c4bb JP	190	u8 tos, struct net_device *devin);
5510cdf7 DA	191	int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
	192	u8 tos, struct net_device *devin,
	193	struct fib_result *res);
c6cffba4	194
02b24941 PA	195	int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
	196	u8 tos, struct net_device *devin,
	197	const struct sk_buff *hint);
	198
c6cffba4 DM	199	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	200	u8 tos, struct net_device *devin)
	201	{
	202	int err;
	203
	204	rcu_read_lock();
	205	err = ip_route_input_noref(skb, dst, src, tos, devin);
64327fc8	206	if (!err) {
222d7dbd	207	skb_dst_force(skb);
64327fc8 SB	208	if (!skb_dst(skb))
	209	err = -EINVAL;
	210	}
c6cffba4 DM	211	rcu_read_unlock();
	212
	213	return err;
	214	}
407eadd9	215
2702c4bb	216	void ipv4_update_pmtu(struct sk_buff skb, struct net net, u32 mtu, int oif,
d888f396	217	u8 protocol);
2702c4bb	218	void ipv4_sk_update_pmtu(struct sk_buff skb, struct sock sk, u32 mtu);
1042caa7	219	void ipv4_redirect(struct sk_buff skb, struct net net, int oif, u8 protocol);
2702c4bb JP	220	void ipv4_sk_redirect(struct sk_buff skb, struct sock sk);
	221	void ip_rt_send_redirect(struct sk_buff *skb);
	222
	223	unsigned int inet_addr_type(struct net *net, __be32 addr);
9b8ff518	224	unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
2702c4bb JP	225	unsigned int inet_dev_addr_type(struct net net, const struct net_device dev,
2702c4bb JP	226	__be32 addr);
30bbaa19 DA	227	unsigned int inet_addr_type_dev_table(struct net *net,
	228	const struct net_device *dev,
	229	__be32 addr);
2702c4bb	230	void ip_rt_multicast_event(struct in_device *);
ca25c300	231	int ip_rt_ioctl(struct net , unsigned int cmd, struct rtentry rt);
2702c4bb	232	void ip_rt_get_source(u8 src, struct sk_buff skb, struct rtable *rt);
9ab179d8 DA	233	struct rtable rt_dst_alloc(struct net_device dev,
9ab179d8 DA	234	unsigned int flags, u16 type,
af13b3c3	235	bool nopolicy, bool noxfrm);
5b18f128	236	struct rtable rt_dst_clone(struct net_device dev, struct rtable *rt);
1da177e4	237
0ff60a45	238	struct in_ifaddr;
2702c4bb JP	239	void fib_add_ifaddr(struct in_ifaddr *);
2702c4bb JP	240	void fib_del_ifaddr(struct in_ifaddr , struct in_ifaddr );
af4d768a	241	void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
0ff60a45	242
510c321b XL	243	void rt_add_uncached_list(struct rtable *rt);
	244	void rt_del_uncached_list(struct rtable *rt);
	245
ee28906f SB	246	int fib_dump_info_fnhe(struct sk_buff skb, struct netlink_callback cb,
ee28906f SB	247	u32 table_id, struct fib_info *fi,
e93fb3e9	248	int *fa_index, int fa_start, unsigned int flags);
ee28906f	249
6da025fa	250	static inline void ip_rt_put(struct rtable *rt)
1da177e4	251	{
6da025fa ED	252	/* dst_release() accepts a NULL parameter.
	253	* We rely on dst being first structure in struct rtable
	254	*/
	255	BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
	256	dst_release(&rt->dst);
1da177e4 LT	257	}
	258
	259	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	260
4839c52b	261	extern const __u8 ip_tos2prio[16];
1da177e4 LT	262
	263	static inline char rt_tos2priority(u8 tos)
	264	{
	265	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	266	}
	267
2d7192d6 DM	268	/* ip_route_connect() and ip_route_newports() work in tandem whilst
	269	* binding a socket for a new outgoing connection.
	270	*
	271	* In order to use IPSEC properly, we must, in the end, have a
	272	* route that was looked up using all available keys including source
	273	* and destination ports.
	274	*
	275	* However, if a source port needs to be allocated (the user specified
	276	* a wildcard source port) we need to obtain addressing information
	277	* in order to perform that allocation.
	278	*
	279	* So ip_route_connect() looks up a route using wildcarded source and
	280	* destination ports in the key, simply so that we can get a pair of
	281	* addresses to use for port allocation.
	282	*
	283	* Later, once the ports are allocated, ip_route_newports() will make
	284	* another route lookup if needed to make sure we catch any IPSEC
	285	* rules keyed on the port information.
	286	*
	287	* The callers allocate the flow key on their stack, and must pass in
	288	* the same flowi4 object to both the ip_route_connect() and the
	289	* ip_route_newports() calls.
	290	*/
	291
	292	static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
	293	u32 tos, int oif, u8 protocol,
	294	__be16 sport, __be16 dport,
0e0d44ab	295	struct sock *sk)
1da177e4	296	{
2d7192d6	297	__u8 flow_flags = 0;
79876874 KK	298
79876874 KK	299	if (inet_sk(sk)->transparent)
94b92b88	300	flow_flags \|= FLOWI_FLAG_ANYSRC;
94b92b88	301
2d7192d6	302	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
e2d118a1 LC	303	protocol, flow_flags, dst, src, dport, sport,
e2d118a1 LC	304	sk->sk_uid);
2d7192d6 DM	305	}
	306
	307	static inline struct rtable ip_route_connect(struct flowi4 fl4,
	308	__be32 dst, __be32 src, u32 tos,
	309	int oif, u8 protocol,
	310	__be16 sport, __be16 dport,
0e0d44ab	311	struct sock *sk)
2d7192d6 DM	312	{
	313	struct net *net = sock_net(sk);
	314	struct rtable *rt;
	315
	316	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
0e0d44ab	317	sport, dport, sk);
79876874	318
1da177e4	319	if (!dst \|\| !src) {
2d7192d6	320	rt = __ip_route_output_key(net, fl4);
b23dd4fe DM	321	if (IS_ERR(rt))
b23dd4fe DM	322	return rt;
b23dd4fe	323	ip_rt_put(rt);
e6b45241	324	flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
1da177e4	325	}
3df98d79	326	security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
2d7192d6	327	return ip_route_output_flow(net, fl4, sk);
1da177e4 LT	328	}
1da177e4 LT	329
2d7192d6 DM	330	static inline struct rtable ip_route_newports(struct flowi4 fl4, struct rtable *rt,
	331	__be16 orig_sport, __be16 orig_dport,
	332	__be16 sport, __be16 dport,
	333	struct sock *sk)
1da177e4	334	{
dca8b089	335	if (sport != orig_sport \|\| dport != orig_dport) {
2d7192d6 DM	336	fl4->fl4_dport = dport;
2d7192d6 DM	337	fl4->fl4_sport = sport;
b23dd4fe	338	ip_rt_put(rt);
e6b45241 JA	339	flowi4_update_output(fl4, sk->sk_bound_dev_if,
	340	RT_CONN_FLAGS(sk), fl4->daddr,
	341	fl4->saddr);
3df98d79	342	security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
2d7192d6	343	return ip_route_output_flow(sock_net(sk), fl4, sk);
1da177e4	344	}
b23dd4fe	345	return rt;
1da177e4 LT	346	}
1da177e4 LT	347
1668e010 KK	348	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	349	{
0340d0b9 TH	350	struct rtable *rt = skb_rtable(skb);
	351
	352	if (rt && rt->rt_iif)
	353	return rt->rt_iif;
13378cad	354
13378cad	355	return skb->skb_iif;
1668e010 KK	356	}
1668e010 KK	357
323e126f DM	358	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	359	{
	360	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
fa50d974	361	struct net *net = dev_net(dst->dev);
323e126f DM	362
323e126f DM	363	if (hoplimit == 0)
fa50d974	364	hoplimit = net->ipv4.sysctl_ip_default_ttl;
323e126f DM	365	return hoplimit;
	366	}
	367
5c9f7c1d DA	368	static inline struct neighbour ip_neigh_gw4(struct net_device dev,
	369	__be32 daddr)
	370	{
	371	struct neighbour *neigh;
	372
	373	neigh = __ipv4_neigh_lookup_noref(dev, daddr);
	374	if (unlikely(!neigh))
	375	neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
	376
	377	return neigh;
	378	}
	379
	380	static inline struct neighbour ip_neigh_for_gw(struct rtable rt,
	381	struct sk_buff *skb,
	382	bool *is_v6gw)
	383	{
	384	struct net_device *dev = rt->dst.dev;
	385	struct neighbour *neigh;
	386
	387	if (likely(rt->rt_gw_family == AF_INET)) {
	388	neigh = ip_neigh_gw4(dev, rt->rt_gw4);
	389	} else if (rt->rt_gw_family == AF_INET6) {
	390	neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
	391	*is_v6gw = true;
	392	} else {
	393	neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
	394	}
	395	return neigh;
	396	}
	397
1da177e4	398	#endif /* _ROUTE_H */