[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / route.h

/*
 * 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
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _ROUTE_H
#define _ROUTE_H

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

#ifndef __KERNEL__
#warning This file is not supposed to be used outside of kernel.
#endif

#define RTO_ONLINK	0x01

#define RTO_CONN	0
/* RTO_CONN is not used (being alias for 0), but preserved not to break
 * some modules referring to it. */

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

struct fib_nh;
struct inet_peer;
struct fib_info;
struct rtable {
	struct dst_entry	dst;

	/* Lookup key. */
	__be32			rt_key_dst;
	__be32			rt_key_src;

	int			rt_genid;
	unsigned		rt_flags;
	__u16			rt_type;
	__u8			rt_tos;

	__be32			rt_dst;	/* Path destination	*/
	__be32			rt_src;	/* Path source		*/
	int			rt_iif;
	int			rt_oif;
	__u32			rt_mark;

	/* Info on neighbour */
	__be32			rt_gateway;

	/* Miscellaneous cached information */
	__be32			rt_spec_dst; /* RFC1122 specific destination */
	u32			rt_peer_genid;
	struct inet_peer	*peer; /* long-living peer info */
	struct fib_info		*fi; /* for client ref to shared metrics */
};

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

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

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

struct rt_cache_stat {
        unsigned int in_hit;
        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_hit;
        unsigned int out_slow_tot;
        unsigned int out_slow_mc;
        unsigned int gc_total;
        unsigned int gc_ignored;
        unsigned int gc_goal_miss;
        unsigned int gc_dst_overflow;
        unsigned int in_hlist_search;
        unsigned int out_hlist_search;
};

extern struct ip_rt_acct __percpu *ip_rt_acct;

struct in_device;
extern int		ip_rt_init(void);
extern void		ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
				       __be32 src, struct net_device *dev);
extern void		rt_cache_flush(struct net *net, int how);
extern void		rt_cache_flush_batch(struct net *net);
extern struct rtable *__ip_route_output_key(struct net *, const struct flowi4 *flp);
extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
					   struct sock *sk);
extern 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,
		.daddr = daddr,
		.saddr = saddr,
		.flowi4_tos = tos,
	};
	return ip_route_output_key(net, &fl4);
}

static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk,
						   __be32 daddr, __be32 saddr,
						   __be16 dport, __be16 sport,
						   __u8 proto, __u8 tos, int oif)
{
	struct flowi4 fl4 = {
		.flowi4_oif = oif,
		.flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0,
		.flowi4_mark = sk ? sk->sk_mark : 0,
		.daddr = daddr,
		.saddr = saddr,
		.flowi4_tos = tos,
		.flowi4_proto = proto,
		.uli.ports.dport = dport,
		.uli.ports.sport = sport,
	};
	if (sk)
		security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
	return ip_route_output_flow(net, &fl4, sk);
}

static inline struct rtable *ip_route_output_gre(struct net *net,
						 __be32 daddr, __be32 saddr,
						 __be32 gre_key, __u8 tos, int oif)
{
	struct flowi4 fl4 = {
		.flowi4_oif = oif,
		.daddr = daddr,
		.saddr = saddr,
		.flowi4_tos = tos,
		.flowi4_proto = IPPROTO_GRE,
		.uli.gre_key = gre_key,
	};
	return ip_route_output_key(net, &fl4);
}

extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
				 u8 tos, struct net_device *devin, bool noref);

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

static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
				       u8 tos, struct net_device *devin)
{
	return ip_route_input_common(skb, dst, src, tos, devin, true);
}

extern unsigned short	ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
extern void		ip_rt_send_redirect(struct sk_buff *skb);

extern unsigned		inet_addr_type(struct net *net, __be32 addr);
extern unsigned		inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
extern void		ip_rt_multicast_event(struct in_device *);
extern int		ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
extern void		ip_rt_get_source(u8 *src, struct rtable *rt);
extern int		ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);

struct in_ifaddr;
extern void fib_add_ifaddr(struct in_ifaddr *);

static inline void ip_rt_put(struct rtable * rt)
{
	if (rt)
		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];
}

static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
					      int oif, u8 protocol,
					      __be16 sport, __be16 dport,
					      struct sock *sk, bool can_sleep)
{
	struct flowi4 fl4 = {
		.flowi4_oif = oif,
		.flowi4_mark = sk->sk_mark,
		.daddr = dst,
		.saddr = src,
		.flowi4_tos = tos,
		.flowi4_proto = protocol,
		.uli.ports.sport = sport,
		.uli.ports.dport = dport,
	};
	struct net *net = sock_net(sk);
	struct rtable *rt;

	if (inet_sk(sk)->transparent)
		fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
	if (protocol == IPPROTO_TCP)
		fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
	if (can_sleep)
		fl4.flowi4_flags |= FLOWI_FLAG_CAN_SLEEP;

	if (!dst || !src) {
		rt = __ip_route_output_key(net, &fl4);
		if (IS_ERR(rt))
			return rt;
		fl4.daddr = rt->rt_dst;
		fl4.saddr = rt->rt_src;
		ip_rt_put(rt);
	}
	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
	return ip_route_output_flow(net, &fl4, sk);
}

static inline struct rtable *ip_route_newports(struct rtable *rt,
					       u8 protocol, __be16 orig_sport,
					       __be16 orig_dport, __be16 sport,
					       __be16 dport, struct sock *sk)
{
	if (sport != orig_sport || dport != orig_dport) {
		struct flowi4 fl4 = {
			.flowi4_oif = rt->rt_oif,
			.flowi4_mark = rt->rt_mark,
			.daddr = rt->rt_key_dst,
			.saddr = rt->rt_key_src,
			.flowi4_tos = rt->rt_tos,
			.flowi4_proto = protocol,
			.uli.ports.sport = sport,
			.uli.ports.dport = dport
		};
		if (inet_sk(sk)->transparent)
			fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
		if (protocol == IPPROTO_TCP)
			fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
		ip_rt_put(rt);
		security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
		return ip_route_output_flow(sock_net(sk), &fl4, sk);
	}
	return rt;
}

extern void rt_bind_peer(struct rtable *rt, int create);

static inline struct inet_peer *rt_get_peer(struct rtable *rt)
{
	if (rt->peer)
		return rt->peer;

	rt_bind_peer(rt, 0);
	return rt->peer;
}

static inline int inet_iif(const struct sk_buff *skb)
{
	return skb_rtable(skb)->rt_iif;
}

extern int sysctl_ip_default_ttl;

static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
{
	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);

	if (hoplimit == 0)
		hoplimit = sysctl_ip_default_ttl;
	return hoplimit;
}

#endif	/* _ROUTE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for the IP router.
	7	*
	8	* Version: @(#)route.h 1.0.4 05/27/93
	9	*
02c30a84	10	* Authors: Ross Biro
1da177e4 LT	11	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	* Fixes:
	13	* Alan Cox : Reformatted. Added ip_rt_local()
	14	* Alan Cox : Support for TCP parameters.
	15	* Alexey Kuznetsov: Major changes for new routing code.
	16	* Mike McLagan : Routing by source
	17	* Robert Olsson : Added rt_cache statistics
	18	*
	19	* This program is free software; you can redistribute it and/or
	20	* modify it under the terms of the GNU General Public License
	21	* as published by the Free Software Foundation; either version
	22	* 2 of the License, or (at your option) any later version.
	23	*/
	24	#ifndef _ROUTE_H
	25	#define _ROUTE_H
	26
1da177e4 LT	27	#include <net/dst.h>
	28	#include <net/inetpeer.h>
	29	#include <net/flow.h>
79876874	30	#include <net/inet_sock.h>
1da177e4 LT	31	#include <linux/in_route.h>
	32	#include <linux/rtnetlink.h>
	33	#include <linux/route.h>
	34	#include <linux/ip.h>
	35	#include <linux/cache.h>
beb8d13b	36	#include <linux/security.h>
1da177e4 LT	37
	38	#ifndef __KERNEL__
	39	#warning This file is not supposed to be used outside of kernel.
	40	#endif
	41
	42	#define RTO_ONLINK 0x01
	43
	44	#define RTO_CONN 0
	45	/* RTO_CONN is not used (being alias for 0), but preserved not to break
	46	* some modules referring to it. */
	47
	48	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
	49
	50	struct fib_nh;
	51	struct inet_peer;
62fa8a84	52	struct fib_info;
fd2c3ef7	53	struct rtable {
d8d1f30b	54	struct dst_entry dst;
1da177e4	55
5e2b61f7 DM	56	/* Lookup key. */
	57	__be32 rt_key_dst;
	58	__be32 rt_key_src;
093c2ca4	59
29e75252	60	int rt_genid;
1da177e4 LT	61	unsigned rt_flags;
1da177e4 LT	62	__u16 rt_type;
5e2b61f7	63	__u8 rt_tos;
1da177e4	64
f2c3fe24 AV	65	__be32 rt_dst; /* Path destination */
f2c3fe24 AV	66	__be32 rt_src; /* Path source */
1da177e4	67	int rt_iif;
5e2b61f7 DM	68	int rt_oif;
5e2b61f7 DM	69	__u32 rt_mark;
1da177e4 LT	70
1da177e4 LT	71	/* Info on neighbour */
f2c3fe24	72	__be32 rt_gateway;
1da177e4	73
1da177e4	74	/* Miscellaneous cached information */
f2c3fe24	75	__be32 rt_spec_dst; /* RFC1122 specific destination */
6431cbc2	76	u32 rt_peer_genid;
1da177e4	77	struct inet_peer peer; / long-living peer info */
62fa8a84	78	struct fib_info fi; / for client ref to shared metrics */
1da177e4 LT	79	};
1da177e4 LT	80
c7537967 DM	81	static inline bool rt_is_input_route(struct rtable *rt)
c7537967 DM	82	{
5e2b61f7	83	return rt->rt_iif != 0;
c7537967 DM	84	}
	85
	86	static inline bool rt_is_output_route(struct rtable *rt)
	87	{
5e2b61f7	88	return rt->rt_iif == 0;
c7537967 DM	89	}
c7537967 DM	90
fd2c3ef7	91	struct ip_rt_acct {
1da177e4 LT	92	__u32 o_bytes;
	93	__u32 o_packets;
	94	__u32 i_bytes;
	95	__u32 i_packets;
	96	};
	97
fd2c3ef7	98	struct rt_cache_stat {
1da177e4 LT	99	unsigned int in_hit;
	100	unsigned int in_slow_tot;
	101	unsigned int in_slow_mc;
	102	unsigned int in_no_route;
	103	unsigned int in_brd;
	104	unsigned int in_martian_dst;
	105	unsigned int in_martian_src;
	106	unsigned int out_hit;
	107	unsigned int out_slow_tot;
	108	unsigned int out_slow_mc;
	109	unsigned int gc_total;
	110	unsigned int gc_ignored;
	111	unsigned int gc_goal_miss;
	112	unsigned int gc_dst_overflow;
	113	unsigned int in_hlist_search;
	114	unsigned int out_hlist_search;
	115	};
	116
7d720c3e	117	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	118
	119	struct in_device;
	120	extern int ip_rt_init(void);
f7655229 AV	121	extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
f7655229 AV	122	__be32 src, struct net_device *dev);
76e6ebfb	123	extern void rt_cache_flush(struct net *net, int how);
6561a3b1	124	extern void rt_cache_flush_batch(struct net *net);
9d6ec938 DM	125	extern struct rtable __ip_route_output_key(struct net , const struct flowi4 *flp);
9d6ec938 DM	126	extern struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
b23dd4fe	127	struct sock *sk);
2774c131	128	extern struct dst_entry ipv4_blackhole_route(struct net net, struct dst_entry *dst_orig);
407eadd9	129
9d6ec938	130	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	131	{
	132	return ip_route_output_flow(net, flp, NULL);
	133	}
	134
78fbfd8a DM	135	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	136	__be32 saddr, u8 tos, int oif)
	137	{
9d6ec938 DM	138	struct flowi4 fl4 = {
	139	.flowi4_oif = oif,
	140	.daddr = daddr,
	141	.saddr = saddr,
	142	.flowi4_tos = tos,
78fbfd8a	143	};
9d6ec938	144	return ip_route_output_key(net, &fl4);
78fbfd8a DM	145	}
	146
	147	static inline struct rtable ip_route_output_ports(struct net net, struct sock *sk,
	148	__be32 daddr, __be32 saddr,
	149	__be16 dport, __be16 sport,
	150	__u8 proto, __u8 tos, int oif)
	151	{
9d6ec938 DM	152	struct flowi4 fl4 = {
	153	.flowi4_oif = oif,
	154	.flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0,
	155	.flowi4_mark = sk ? sk->sk_mark : 0,
	156	.daddr = daddr,
	157	.saddr = saddr,
	158	.flowi4_tos = tos,
	159	.flowi4_proto = proto,
	160	.uli.ports.dport = dport,
	161	.uli.ports.sport = sport,
78fbfd8a DM	162	};
78fbfd8a DM	163	if (sk)
9d6ec938 DM	164	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
9d6ec938 DM	165	return ip_route_output_flow(net, &fl4, sk);
78fbfd8a DM	166	}
	167
	168	static inline struct rtable ip_route_output_gre(struct net net,
	169	__be32 daddr, __be32 saddr,
	170	__be32 gre_key, __u8 tos, int oif)
	171	{
9d6ec938 DM	172	struct flowi4 fl4 = {
	173	.flowi4_oif = oif,
	174	.daddr = daddr,
	175	.saddr = saddr,
	176	.flowi4_tos = tos,
	177	.flowi4_proto = IPPROTO_GRE,
	178	.uli.gre_key = gre_key,
78fbfd8a	179	};
9d6ec938	180	return ip_route_output_key(net, &fl4);
78fbfd8a DM	181	}
78fbfd8a DM	182
407eadd9 ED	183	extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
	184	u8 tos, struct net_device *devin, bool noref);
	185
	186	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	187	u8 tos, struct net_device *devin)
	188	{
	189	return ip_route_input_common(skb, dst, src, tos, devin, false);
	190	}
	191
	192	static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
	193	u8 tos, struct net_device *devin)
	194	{
	195	return ip_route_input_common(skb, dst, src, tos, devin, true);
	196	}
	197
0010e465	198	extern unsigned short ip_rt_frag_needed(struct net net, struct iphdr iph, unsigned short new_mtu, struct net_device *dev);
1da177e4 LT	199	extern void ip_rt_send_redirect(struct sk_buff *skb);
1da177e4 LT	200
6b175b26 EB	201	extern unsigned inet_addr_type(struct net *net, __be32 addr);
6b175b26 EB	202	extern unsigned inet_dev_addr_type(struct net net, const struct net_device dev, __be32 addr);
1da177e4	203	extern void ip_rt_multicast_event(struct in_device *);
1bad118a	204	extern int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
1da177e4 LT	205	extern void ip_rt_get_source(u8 src, struct rtable rt);
	206	extern int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
	207
0ff60a45 JHS	208	struct in_ifaddr;
	209	extern void fib_add_ifaddr(struct in_ifaddr *);
	210
1da177e4 LT	211	static inline void ip_rt_put(struct rtable * rt)
	212	{
	213	if (rt)
d8d1f30b	214	dst_release(&rt->dst);
1da177e4 LT	215	}
	216
	217	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	218
4839c52b	219	extern const __u8 ip_tos2prio[16];
1da177e4 LT	220
	221	static inline char rt_tos2priority(u8 tos)
	222	{
	223	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	224	}
	225
b23dd4fe DM	226	static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
	227	int oif, u8 protocol,
	228	__be16 sport, __be16 dport,
	229	struct sock *sk, bool can_sleep)
1da177e4	230	{
9d6ec938 DM	231	struct flowi4 fl4 = {
	232	.flowi4_oif = oif,
	233	.flowi4_mark = sk->sk_mark,
	234	.daddr = dst,
	235	.saddr = src,
	236	.flowi4_tos = tos,
	237	.flowi4_proto = protocol,
	238	.uli.ports.sport = sport,
	239	.uli.ports.dport = dport,
6281dcc9	240	};
3b1e0a65	241	struct net *net = sock_net(sk);
b23dd4fe	242	struct rtable *rt;
79876874 KK	243
79876874 KK	244	if (inet_sk(sk)->transparent)
9d6ec938	245	fl4.flowi4_flags \|= FLOWI_FLAG_ANYSRC;
a4daad6b	246	if (protocol == IPPROTO_TCP)
9d6ec938	247	fl4.flowi4_flags \|= FLOWI_FLAG_PRECOW_METRICS;
5df65e55	248	if (can_sleep)
9d6ec938	249	fl4.flowi4_flags \|= FLOWI_FLAG_CAN_SLEEP;
79876874	250
1da177e4	251	if (!dst \|\| !src) {
9d6ec938	252	rt = __ip_route_output_key(net, &fl4);
b23dd4fe DM	253	if (IS_ERR(rt))
b23dd4fe DM	254	return rt;
9d6ec938 DM	255	fl4.daddr = rt->rt_dst;
9d6ec938 DM	256	fl4.saddr = rt->rt_src;
b23dd4fe	257	ip_rt_put(rt);
1da177e4	258	}
9d6ec938 DM	259	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
9d6ec938 DM	260	return ip_route_output_flow(net, &fl4, sk);
1da177e4 LT	261	}
1da177e4 LT	262
b23dd4fe DM	263	static inline struct rtable ip_route_newports(struct rtable rt,
	264	u8 protocol, __be16 orig_sport,
	265	__be16 orig_dport, __be16 sport,
	266	__be16 dport, struct sock *sk)
1da177e4	267	{
dca8b089	268	if (sport != orig_sport \|\| dport != orig_dport) {
9d6ec938 DM	269	struct flowi4 fl4 = {
	270	.flowi4_oif = rt->rt_oif,
	271	.flowi4_mark = rt->rt_mark,
	272	.daddr = rt->rt_key_dst,
	273	.saddr = rt->rt_key_src,
	274	.flowi4_tos = rt->rt_tos,
	275	.flowi4_proto = protocol,
	276	.uli.ports.sport = sport,
	277	.uli.ports.dport = dport
6281dcc9	278	};
fb0c5f0b	279	if (inet_sk(sk)->transparent)
9d6ec938	280	fl4.flowi4_flags \|= FLOWI_FLAG_ANYSRC;
a4daad6b	281	if (protocol == IPPROTO_TCP)
9d6ec938	282	fl4.flowi4_flags \|= FLOWI_FLAG_PRECOW_METRICS;
b23dd4fe	283	ip_rt_put(rt);
9d6ec938 DM	284	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
9d6ec938 DM	285	return ip_route_output_flow(sock_net(sk), &fl4, sk);
1da177e4	286	}
b23dd4fe	287	return rt;
1da177e4 LT	288	}
	289
	290	extern void rt_bind_peer(struct rtable *rt, int create);
	291
	292	static inline struct inet_peer rt_get_peer(struct rtable rt)
	293	{
	294	if (rt->peer)
	295	return rt->peer;
	296
	297	rt_bind_peer(rt, 0);
	298	return rt->peer;
	299	}
	300
1668e010 KK	301	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	302	{
511c3f92	303	return skb_rtable(skb)->rt_iif;
1668e010 KK	304	}
1668e010 KK	305
323e126f DM	306	extern int sysctl_ip_default_ttl;
	307
	308	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	309	{
	310	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	311
	312	if (hoplimit == 0)
	313	hoplimit = sysctl_ip_default_ttl;
	314	return hoplimit;
	315	}
	316
1da177e4	317	#endif /* _ROUTE_H */