[deliverable/linux.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/rcupdate.h>
#include <linux/route.h>
#include <linux/ip.h>
#include <linux/cache.h>
#include <linux/security.h>

#define RTO_ONLINK	0x01

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

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

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

	int			rt_iif;

	/* Info on neighbour */
	__be32			rt_gateway;

	/* Miscellaneous cached information */
	u32			rt_pmtu;
};

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_gateway)
		return rt->rt_gateway;
	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_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		rt_cache_flush(struct net *net, int how);
extern struct rtable *__ip_route_output_key(struct net *, 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,
		.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);
	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, 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);
}

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

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);
	rcu_read_unlock();

	return err;
}

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

extern unsigned int		inet_addr_type(struct net *net, __be32 addr);
extern unsigned int		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 sk_buff *skb, 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 *);
extern void fib_del_ifaddr(struct in_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];
}

/* 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, bool can_sleep)
{
	__u8 flow_flags = 0;

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

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

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, bool can_sleep)
{
	struct net *net = sock_net(sk);
	struct rtable *rt;

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

	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(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(fl4));
		return ip_route_output_flow(sock_net(sk), fl4, sk);
	}
	return rt;
}

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

	if (iif)
		return iif;
	return skb->skb_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>
1da177e4 LT	32	#include <linux/rtnetlink.h>
c6cffba4	33	#include <linux/rcupdate.h>
1da177e4 LT	34	#include <linux/route.h>
	35	#include <linux/ip.h>
	36	#include <linux/cache.h>
beb8d13b	37	#include <linux/security.h>
1da177e4	38
1da177e4 LT	39	#define RTO_ONLINK 0x01
1da177e4 LT	40
1da177e4 LT	41	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
	42
	43	struct fib_nh;
62fa8a84	44	struct fib_info;
fd2c3ef7	45	struct rtable {
d8d1f30b	46	struct dst_entry dst;
1da177e4	47
29e75252	48	int rt_genid;
95c96174	49	unsigned int rt_flags;
1da177e4	50	__u16 rt_type;
9917e1e8	51	__u16 rt_is_input;
1da177e4	52
1da177e4 LT	53	int rt_iif;
	54
	55	/* Info on neighbour */
f2c3fe24	56	__be32 rt_gateway;
1da177e4	57
1da177e4	58	/* Miscellaneous cached information */
5943634f	59	u32 rt_pmtu;
1da177e4 LT	60	};
1da177e4 LT	61
b8400f37	62	static inline bool rt_is_input_route(const struct rtable *rt)
c7537967	63	{
9917e1e8	64	return rt->rt_is_input != 0;
c7537967 DM	65	}
c7537967 DM	66
b8400f37	67	static inline bool rt_is_output_route(const struct rtable *rt)
c7537967	68	{
9917e1e8	69	return rt->rt_is_input == 0;
c7537967 DM	70	}
c7537967 DM	71
f8126f1d DM	72	static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
	73	{
	74	if (rt->rt_gateway)
	75	return rt->rt_gateway;
	76	return daddr;
	77	}
	78
fd2c3ef7	79	struct ip_rt_acct {
1da177e4 LT	80	__u32 o_bytes;
	81	__u32 o_packets;
	82	__u32 i_bytes;
	83	__u32 i_packets;
	84	};
	85
fd2c3ef7	86	struct rt_cache_stat {
1da177e4 LT	87	unsigned int in_hit;
	88	unsigned int in_slow_tot;
	89	unsigned int in_slow_mc;
	90	unsigned int in_no_route;
	91	unsigned int in_brd;
	92	unsigned int in_martian_dst;
	93	unsigned int in_martian_src;
	94	unsigned int out_hit;
	95	unsigned int out_slow_tot;
	96	unsigned int out_slow_mc;
	97	unsigned int gc_total;
	98	unsigned int gc_ignored;
	99	unsigned int gc_goal_miss;
	100	unsigned int gc_dst_overflow;
	101	unsigned int in_hlist_search;
	102	unsigned int out_hlist_search;
	103	};
	104
7d720c3e	105	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	106
	107	struct in_device;
	108	extern int ip_rt_init(void);
76e6ebfb	109	extern void rt_cache_flush(struct net *net, int how);
813b3b5d	110	extern struct rtable __ip_route_output_key(struct net , struct flowi4 *flp);
9d6ec938	111	extern struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
b23dd4fe	112	struct sock *sk);
2774c131	113	extern struct dst_entry ipv4_blackhole_route(struct net net, struct dst_entry *dst_orig);
407eadd9	114
9d6ec938	115	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	116	{
	117	return ip_route_output_flow(net, flp, NULL);
	118	}
	119
78fbfd8a DM	120	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	121	__be32 saddr, u8 tos, int oif)
	122	{
9d6ec938 DM	123	struct flowi4 fl4 = {
9d6ec938 DM	124	.flowi4_oif = oif,
c5d21c4b	125	.flowi4_tos = tos,
9d6ec938 DM	126	.daddr = daddr,
9d6ec938 DM	127	.saddr = saddr,
78fbfd8a	128	};
9d6ec938	129	return ip_route_output_key(net, &fl4);
78fbfd8a DM	130	}
78fbfd8a DM	131
31e4543d DM	132	static inline struct rtable ip_route_output_ports(struct net net, struct flowi4 *fl4,
31e4543d DM	133	struct sock *sk,
78fbfd8a DM	134	__be32 daddr, __be32 saddr,
	135	__be16 dport, __be16 sport,
	136	__u8 proto, __u8 tos, int oif)
	137	{
31e4543d	138	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
94b92b88 DM	139	RT_SCOPE_UNIVERSE, proto,
	140	sk ? inet_sk_flowi_flags(sk) : 0,
	141	daddr, saddr, dport, sport);
78fbfd8a	142	if (sk)
31e4543d DM	143	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
31e4543d DM	144	return ip_route_output_flow(net, fl4, sk);
78fbfd8a DM	145	}
78fbfd8a DM	146
cbb1e85f	147	static inline struct rtable ip_route_output_gre(struct net net, struct flowi4 *fl4,
78fbfd8a DM	148	__be32 daddr, __be32 saddr,
	149	__be32 gre_key, __u8 tos, int oif)
	150	{
cbb1e85f DM	151	memset(fl4, 0, sizeof(*fl4));
	152	fl4->flowi4_oif = oif;
	153	fl4->daddr = daddr;
	154	fl4->saddr = saddr;
	155	fl4->flowi4_tos = tos;
	156	fl4->flowi4_proto = IPPROTO_GRE;
	157	fl4->fl4_gre_key = gre_key;
	158	return ip_route_output_key(net, fl4);
78fbfd8a DM	159	}
78fbfd8a DM	160
c6cffba4 DM	161	extern int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
	162	u8 tos, struct net_device *devin);
	163
	164	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	165	u8 tos, struct net_device *devin)
	166	{
	167	int err;
	168
	169	rcu_read_lock();
	170	err = ip_route_input_noref(skb, dst, src, tos, devin);
	171	if (!err)
	172	skb_dst_force(skb);
	173	rcu_read_unlock();
	174
	175	return err;
	176	}
407eadd9	177
36393395 DM	178	extern void ipv4_update_pmtu(struct sk_buff skb, struct net net, u32 mtu,
	179	int oif, u32 mark, u8 protocol, int flow_flags);
	180	extern void ipv4_sk_update_pmtu(struct sk_buff skb, struct sock sk, u32 mtu);
b42597e2 DM	181	extern void ipv4_redirect(struct sk_buff skb, struct net net,
	182	int oif, u32 mark, u8 protocol, int flow_flags);
	183	extern void ipv4_sk_redirect(struct sk_buff skb, struct sock sk);
36393395	184	extern void ip_rt_send_redirect(struct sk_buff *skb);
1da177e4	185
95c96174 ED	186	extern unsigned int inet_addr_type(struct net *net, __be32 addr);
95c96174 ED	187	extern unsigned int inet_dev_addr_type(struct net net, const struct net_device dev, __be32 addr);
1da177e4	188	extern void ip_rt_multicast_event(struct in_device *);
1bad118a	189	extern int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
8e36360a	190	extern void ip_rt_get_source(u8 src, struct sk_buff skb, struct rtable *rt);
1da177e4 LT	191	extern int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
1da177e4 LT	192
0ff60a45 JHS	193	struct in_ifaddr;
0ff60a45 JHS	194	extern void fib_add_ifaddr(struct in_ifaddr *);
e6abbaa2	195	extern void fib_del_ifaddr(struct in_ifaddr , struct in_ifaddr );
0ff60a45	196
1da177e4 LT	197	static inline void ip_rt_put(struct rtable * rt)
	198	{
	199	if (rt)
d8d1f30b	200	dst_release(&rt->dst);
1da177e4 LT	201	}
	202
	203	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	204
4839c52b	205	extern const __u8 ip_tos2prio[16];
1da177e4 LT	206
	207	static inline char rt_tos2priority(u8 tos)
	208	{
	209	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	210	}
	211
2d7192d6 DM	212	/* ip_route_connect() and ip_route_newports() work in tandem whilst
	213	* binding a socket for a new outgoing connection.
	214	*
	215	* In order to use IPSEC properly, we must, in the end, have a
	216	* route that was looked up using all available keys including source
	217	* and destination ports.
	218	*
	219	* However, if a source port needs to be allocated (the user specified
	220	* a wildcard source port) we need to obtain addressing information
	221	* in order to perform that allocation.
	222	*
	223	* So ip_route_connect() looks up a route using wildcarded source and
	224	* destination ports in the key, simply so that we can get a pair of
	225	* addresses to use for port allocation.
	226	*
	227	* Later, once the ports are allocated, ip_route_newports() will make
	228	* another route lookup if needed to make sure we catch any IPSEC
	229	* rules keyed on the port information.
	230	*
	231	* The callers allocate the flow key on their stack, and must pass in
	232	* the same flowi4 object to both the ip_route_connect() and the
	233	* ip_route_newports() calls.
	234	*/
	235
	236	static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
	237	u32 tos, int oif, u8 protocol,
	238	__be16 sport, __be16 dport,
	239	struct sock *sk, bool can_sleep)
1da177e4	240	{
2d7192d6	241	__u8 flow_flags = 0;
79876874 KK	242
79876874 KK	243	if (inet_sk(sk)->transparent)
94b92b88	244	flow_flags \|= FLOWI_FLAG_ANYSRC;
5df65e55	245	if (can_sleep)
94b92b88 DM	246	flow_flags \|= FLOWI_FLAG_CAN_SLEEP;
94b92b88 DM	247
2d7192d6	248	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
94b92b88	249	protocol, flow_flags, dst, src, dport, sport);
2d7192d6 DM	250	}
	251
	252	static inline struct rtable ip_route_connect(struct flowi4 fl4,
	253	__be32 dst, __be32 src, u32 tos,
	254	int oif, u8 protocol,
	255	__be16 sport, __be16 dport,
	256	struct sock *sk, bool can_sleep)
	257	{
	258	struct net *net = sock_net(sk);
	259	struct rtable *rt;
	260
	261	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
	262	sport, dport, sk, can_sleep);
79876874	263
1da177e4	264	if (!dst \|\| !src) {
2d7192d6	265	rt = __ip_route_output_key(net, fl4);
b23dd4fe DM	266	if (IS_ERR(rt))
b23dd4fe DM	267	return rt;
b23dd4fe	268	ip_rt_put(rt);
e6b45241	269	flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
1da177e4	270	}
2d7192d6 DM	271	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	272	return ip_route_output_flow(net, fl4, sk);
1da177e4 LT	273	}
1da177e4 LT	274
2d7192d6 DM	275	static inline struct rtable ip_route_newports(struct flowi4 fl4, struct rtable *rt,
	276	__be16 orig_sport, __be16 orig_dport,
	277	__be16 sport, __be16 dport,
	278	struct sock *sk)
1da177e4	279	{
dca8b089	280	if (sport != orig_sport \|\| dport != orig_dport) {
2d7192d6 DM	281	fl4->fl4_dport = dport;
2d7192d6 DM	282	fl4->fl4_sport = sport;
b23dd4fe	283	ip_rt_put(rt);
e6b45241 JA	284	flowi4_update_output(fl4, sk->sk_bound_dev_if,
	285	RT_CONN_FLAGS(sk), fl4->daddr,
	286	fl4->saddr);
2d7192d6 DM	287	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	288	return ip_route_output_flow(sock_net(sk), fl4, sk);
1da177e4	289	}
b23dd4fe	290	return rt;
1da177e4 LT	291	}
1da177e4 LT	292
1668e010 KK	293	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	294	{
13378cad DM	295	int iif = skb_rtable(skb)->rt_iif;
	296
	297	if (iif)
	298	return iif;
	299	return skb->skb_iif;
1668e010 KK	300	}
1668e010 KK	301
323e126f DM	302	extern int sysctl_ip_default_ttl;
	303
	304	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	305	{
	306	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	307
	308	if (hoplimit == 0)
	309	hoplimit = sysctl_ip_default_ttl;
	310	return hoplimit;
	311	}
	312
1da177e4	313	#endif /* _ROUTE_H */