[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>

/* 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 fib_nh;
struct fib_info;
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;

	/* Info on neighbour */
	__be32			rt_gateway;

	/* Miscellaneous cached information */
	u32			rt_pmtu;

	struct list_head	rt_uncached;
};

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_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(struct net *, struct flowi4 *flp);
struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
				    struct sock *sk);
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);
}

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;
}

void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
		      u32 mark, u8 protocol, int flow_flags);
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, u32 mark,
		   u8 protocol, int flow_flags);
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_dev_addr_type(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, void __user *arg);
void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);

struct in_ifaddr;
void fib_add_ifaddr(struct in_ifaddr *);
void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);

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);
}

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(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
f87c10a8 HFS	39	/* IPv4 datagram length is stored into 16bit field (tot_len) */
	40	#define IP_MAX_MTU 0xFFFFU
	41
1da177e4 LT	42	#define RTO_ONLINK 0x01
1da177e4 LT	43
1da177e4	44	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
aa661581	45	#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) \| sock_flag(sk, SOCK_LOCALROUTE))
1da177e4 LT	46
1da177e4 LT	47	struct fib_nh;
62fa8a84	48	struct fib_info;
fd2c3ef7	49	struct rtable {
d8d1f30b	50	struct dst_entry dst;
1da177e4	51
29e75252	52	int rt_genid;
95c96174	53	unsigned int rt_flags;
1da177e4	54	__u16 rt_type;
155e8336 JA	55	__u8 rt_is_input;
155e8336 JA	56	__u8 rt_uses_gateway;
1da177e4	57
1da177e4 LT	58	int rt_iif;
	59
	60	/* Info on neighbour */
f2c3fe24	61	__be32 rt_gateway;
1da177e4	62
1da177e4	63	/* Miscellaneous cached information */
5943634f	64	u32 rt_pmtu;
caacf05e DM	65
caacf05e DM	66	struct list_head rt_uncached;
1da177e4 LT	67	};
1da177e4 LT	68
b8400f37	69	static inline bool rt_is_input_route(const struct rtable *rt)
c7537967	70	{
9917e1e8	71	return rt->rt_is_input != 0;
c7537967 DM	72	}
c7537967 DM	73
b8400f37	74	static inline bool rt_is_output_route(const struct rtable *rt)
c7537967	75	{
9917e1e8	76	return rt->rt_is_input == 0;
c7537967 DM	77	}
c7537967 DM	78
f8126f1d DM	79	static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
	80	{
	81	if (rt->rt_gateway)
	82	return rt->rt_gateway;
	83	return daddr;
	84	}
	85
fd2c3ef7	86	struct ip_rt_acct {
1da177e4 LT	87	__u32 o_bytes;
	88	__u32 o_packets;
	89	__u32 i_bytes;
	90	__u32 i_packets;
	91	};
	92
fd2c3ef7	93	struct rt_cache_stat {
1da177e4 LT	94	unsigned int in_slow_tot;
	95	unsigned int in_slow_mc;
	96	unsigned int in_no_route;
	97	unsigned int in_brd;
	98	unsigned int in_martian_dst;
	99	unsigned int in_martian_src;
1da177e4 LT	100	unsigned int out_slow_tot;
1da177e4 LT	101	unsigned int out_slow_mc;
1da177e4 LT	102	};
1da177e4 LT	103
7d720c3e	104	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	105
1da177e4 LT	106	struct in_device;
2702c4bb JP	107
	108	int ip_rt_init(void);
	109	void rt_cache_flush(struct net *net);
	110	void rt_flush_dev(struct net_device *dev);
	111	struct rtable __ip_route_output_key(struct net , struct flowi4 *flp);
	112	struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
	113	struct sock *sk);
	114	struct dst_entry ipv4_blackhole_route(struct net net,
	115	struct dst_entry *dst_orig);
407eadd9	116
9d6ec938	117	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	118	{
	119	return ip_route_output_flow(net, flp, NULL);
	120	}
	121
78fbfd8a DM	122	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	123	__be32 saddr, u8 tos, int oif)
	124	{
9d6ec938 DM	125	struct flowi4 fl4 = {
9d6ec938 DM	126	.flowi4_oif = oif,
c5d21c4b	127	.flowi4_tos = tos,
9d6ec938 DM	128	.daddr = daddr,
9d6ec938 DM	129	.saddr = saddr,
78fbfd8a	130	};
9d6ec938	131	return ip_route_output_key(net, &fl4);
78fbfd8a DM	132	}
78fbfd8a DM	133
31e4543d DM	134	static inline struct rtable ip_route_output_ports(struct net net, struct flowi4 *fl4,
31e4543d DM	135	struct sock *sk,
78fbfd8a DM	136	__be32 daddr, __be32 saddr,
	137	__be16 dport, __be16 sport,
	138	__u8 proto, __u8 tos, int oif)
	139	{
31e4543d	140	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
94b92b88 DM	141	RT_SCOPE_UNIVERSE, proto,
	142	sk ? inet_sk_flowi_flags(sk) : 0,
	143	daddr, saddr, dport, sport);
78fbfd8a	144	if (sk)
31e4543d DM	145	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
31e4543d DM	146	return ip_route_output_flow(net, fl4, sk);
78fbfd8a DM	147	}
78fbfd8a DM	148
cbb1e85f	149	static inline struct rtable ip_route_output_gre(struct net net, struct flowi4 *fl4,
78fbfd8a DM	150	__be32 daddr, __be32 saddr,
	151	__be32 gre_key, __u8 tos, int oif)
	152	{
cbb1e85f DM	153	memset(fl4, 0, sizeof(*fl4));
	154	fl4->flowi4_oif = oif;
	155	fl4->daddr = daddr;
	156	fl4->saddr = saddr;
	157	fl4->flowi4_tos = tos;
	158	fl4->flowi4_proto = IPPROTO_GRE;
	159	fl4->fl4_gre_key = gre_key;
	160	return ip_route_output_key(net, fl4);
78fbfd8a DM	161	}
78fbfd8a DM	162
2702c4bb JP	163	int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
2702c4bb JP	164	u8 tos, struct net_device *devin);
c6cffba4 DM	165
	166	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	167	u8 tos, struct net_device *devin)
	168	{
	169	int err;
	170
	171	rcu_read_lock();
	172	err = ip_route_input_noref(skb, dst, src, tos, devin);
	173	if (!err)
	174	skb_dst_force(skb);
	175	rcu_read_unlock();
	176
	177	return err;
	178	}
407eadd9	179
2702c4bb JP	180	void ipv4_update_pmtu(struct sk_buff skb, struct net net, u32 mtu, int oif,
	181	u32 mark, u8 protocol, int flow_flags);
	182	void ipv4_sk_update_pmtu(struct sk_buff skb, struct sock sk, u32 mtu);
	183	void ipv4_redirect(struct sk_buff skb, struct net net, int oif, u32 mark,
	184	u8 protocol, int flow_flags);
	185	void ipv4_sk_redirect(struct sk_buff skb, struct sock sk);
	186	void ip_rt_send_redirect(struct sk_buff *skb);
	187
	188	unsigned int inet_addr_type(struct net *net, __be32 addr);
	189	unsigned int inet_dev_addr_type(struct net net, const struct net_device dev,
	190	__be32 addr);
	191	void ip_rt_multicast_event(struct in_device *);
	192	int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
	193	void ip_rt_get_source(u8 src, struct sk_buff skb, struct rtable *rt);
1da177e4	194
0ff60a45	195	struct in_ifaddr;
2702c4bb JP	196	void fib_add_ifaddr(struct in_ifaddr *);
2702c4bb JP	197	void fib_del_ifaddr(struct in_ifaddr , struct in_ifaddr );
0ff60a45	198
6da025fa	199	static inline void ip_rt_put(struct rtable *rt)
1da177e4	200	{
6da025fa ED	201	/* dst_release() accepts a NULL parameter.
	202	* We rely on dst being first structure in struct rtable
	203	*/
	204	BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
	205	dst_release(&rt->dst);
1da177e4 LT	206	}
	207
	208	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	209
4839c52b	210	extern const __u8 ip_tos2prio[16];
1da177e4 LT	211
	212	static inline char rt_tos2priority(u8 tos)
	213	{
	214	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	215	}
	216
2d7192d6 DM	217	/* ip_route_connect() and ip_route_newports() work in tandem whilst
	218	* binding a socket for a new outgoing connection.
	219	*
	220	* In order to use IPSEC properly, we must, in the end, have a
	221	* route that was looked up using all available keys including source
	222	* and destination ports.
	223	*
	224	* However, if a source port needs to be allocated (the user specified
	225	* a wildcard source port) we need to obtain addressing information
	226	* in order to perform that allocation.
	227	*
	228	* So ip_route_connect() looks up a route using wildcarded source and
	229	* destination ports in the key, simply so that we can get a pair of
	230	* addresses to use for port allocation.
	231	*
	232	* Later, once the ports are allocated, ip_route_newports() will make
	233	* another route lookup if needed to make sure we catch any IPSEC
	234	* rules keyed on the port information.
	235	*
	236	* The callers allocate the flow key on their stack, and must pass in
	237	* the same flowi4 object to both the ip_route_connect() and the
	238	* ip_route_newports() calls.
	239	*/
	240
	241	static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
	242	u32 tos, int oif, u8 protocol,
	243	__be16 sport, __be16 dport,
0e0d44ab	244	struct sock *sk)
1da177e4	245	{
2d7192d6	246	__u8 flow_flags = 0;
79876874 KK	247
79876874 KK	248	if (inet_sk(sk)->transparent)
94b92b88	249	flow_flags \|= FLOWI_FLAG_ANYSRC;
94b92b88	250
2d7192d6	251	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
94b92b88	252	protocol, flow_flags, dst, src, dport, sport);
2d7192d6 DM	253	}
	254
	255	static inline struct rtable ip_route_connect(struct flowi4 fl4,
	256	__be32 dst, __be32 src, u32 tos,
	257	int oif, u8 protocol,
	258	__be16 sport, __be16 dport,
0e0d44ab	259	struct sock *sk)
2d7192d6 DM	260	{
	261	struct net *net = sock_net(sk);
	262	struct rtable *rt;
	263
	264	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
0e0d44ab	265	sport, dport, sk);
79876874	266
1da177e4	267	if (!dst \|\| !src) {
2d7192d6	268	rt = __ip_route_output_key(net, fl4);
b23dd4fe DM	269	if (IS_ERR(rt))
b23dd4fe DM	270	return rt;
b23dd4fe	271	ip_rt_put(rt);
e6b45241	272	flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
1da177e4	273	}
2d7192d6 DM	274	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	275	return ip_route_output_flow(net, fl4, sk);
1da177e4 LT	276	}
1da177e4 LT	277
2d7192d6 DM	278	static inline struct rtable ip_route_newports(struct flowi4 fl4, struct rtable *rt,
	279	__be16 orig_sport, __be16 orig_dport,
	280	__be16 sport, __be16 dport,
	281	struct sock *sk)
1da177e4	282	{
dca8b089	283	if (sport != orig_sport \|\| dport != orig_dport) {
2d7192d6 DM	284	fl4->fl4_dport = dport;
2d7192d6 DM	285	fl4->fl4_sport = sport;
b23dd4fe	286	ip_rt_put(rt);
e6b45241 JA	287	flowi4_update_output(fl4, sk->sk_bound_dev_if,
	288	RT_CONN_FLAGS(sk), fl4->daddr,
	289	fl4->saddr);
2d7192d6 DM	290	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	291	return ip_route_output_flow(sock_net(sk), fl4, sk);
1da177e4	292	}
b23dd4fe	293	return rt;
1da177e4 LT	294	}
1da177e4 LT	295
1668e010 KK	296	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	297	{
13378cad DM	298	int iif = skb_rtable(skb)->rt_iif;
	299
	300	if (iif)
	301	return iif;
	302	return skb->skb_iif;
1668e010 KK	303	}
1668e010 KK	304
323e126f DM	305	extern int sysctl_ip_default_ttl;
	306
	307	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	308	{
	309	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	310
	311	if (hoplimit == 0)
	312	hoplimit = sysctl_ip_default_ttl;
	313	return hoplimit;
	314	}
	315
1da177e4	316	#endif /* _ROUTE_H */