[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))
#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);
int ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);

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;
}

static inline bool ip_sk_accept_pmtu(const struct sock *sk)
{
	return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE;
}

static inline bool ip_sk_use_pmtu(const struct sock *sk)
{
	return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
}

static inline int ip_skb_dst_mtu(const struct sk_buff *skb)
{
	return (!skb->sk || ip_sk_use_pmtu(skb->sk)) ?
	       dst_mtu(skb_dst(skb)) : skb_dst(skb)->dev->mtu;
}

#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	41	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
aa661581	42	#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) \| sock_flag(sk, SOCK_LOCALROUTE))
1da177e4 LT	43
1da177e4 LT	44	struct fib_nh;
62fa8a84	45	struct fib_info;
fd2c3ef7	46	struct rtable {
d8d1f30b	47	struct dst_entry dst;
1da177e4	48
29e75252	49	int rt_genid;
95c96174	50	unsigned int rt_flags;
1da177e4	51	__u16 rt_type;
155e8336 JA	52	__u8 rt_is_input;
155e8336 JA	53	__u8 rt_uses_gateway;
1da177e4	54
1da177e4 LT	55	int rt_iif;
	56
	57	/* Info on neighbour */
f2c3fe24	58	__be32 rt_gateway;
1da177e4	59
1da177e4	60	/* Miscellaneous cached information */
5943634f	61	u32 rt_pmtu;
caacf05e DM	62
caacf05e DM	63	struct list_head rt_uncached;
1da177e4 LT	64	};
1da177e4 LT	65
b8400f37	66	static inline bool rt_is_input_route(const struct rtable *rt)
c7537967	67	{
9917e1e8	68	return rt->rt_is_input != 0;
c7537967 DM	69	}
c7537967 DM	70
b8400f37	71	static inline bool rt_is_output_route(const struct rtable *rt)
c7537967	72	{
9917e1e8	73	return rt->rt_is_input == 0;
c7537967 DM	74	}
c7537967 DM	75
f8126f1d DM	76	static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
	77	{
	78	if (rt->rt_gateway)
	79	return rt->rt_gateway;
	80	return daddr;
	81	}
	82
fd2c3ef7	83	struct ip_rt_acct {
1da177e4 LT	84	__u32 o_bytes;
	85	__u32 o_packets;
	86	__u32 i_bytes;
	87	__u32 i_packets;
	88	};
	89
fd2c3ef7	90	struct rt_cache_stat {
1da177e4 LT	91	unsigned int in_slow_tot;
	92	unsigned int in_slow_mc;
	93	unsigned int in_no_route;
	94	unsigned int in_brd;
	95	unsigned int in_martian_dst;
	96	unsigned int in_martian_src;
1da177e4 LT	97	unsigned int out_slow_tot;
1da177e4 LT	98	unsigned int out_slow_mc;
1da177e4 LT	99	};
1da177e4 LT	100
7d720c3e	101	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	102
1da177e4 LT	103	struct in_device;
2702c4bb JP	104
	105	int ip_rt_init(void);
	106	void rt_cache_flush(struct net *net);
	107	void rt_flush_dev(struct net_device *dev);
	108	struct rtable __ip_route_output_key(struct net , struct flowi4 *flp);
	109	struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
	110	struct sock *sk);
	111	struct dst_entry ipv4_blackhole_route(struct net net,
	112	struct dst_entry *dst_orig);
407eadd9	113
9d6ec938	114	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	115	{
	116	return ip_route_output_flow(net, flp, NULL);
	117	}
	118
78fbfd8a DM	119	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	120	__be32 saddr, u8 tos, int oif)
	121	{
9d6ec938 DM	122	struct flowi4 fl4 = {
9d6ec938 DM	123	.flowi4_oif = oif,
c5d21c4b	124	.flowi4_tos = tos,
9d6ec938 DM	125	.daddr = daddr,
9d6ec938 DM	126	.saddr = saddr,
78fbfd8a	127	};
9d6ec938	128	return ip_route_output_key(net, &fl4);
78fbfd8a DM	129	}
78fbfd8a DM	130
31e4543d DM	131	static inline struct rtable ip_route_output_ports(struct net net, struct flowi4 *fl4,
31e4543d DM	132	struct sock *sk,
78fbfd8a DM	133	__be32 daddr, __be32 saddr,
	134	__be16 dport, __be16 sport,
	135	__u8 proto, __u8 tos, int oif)
	136	{
31e4543d	137	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
94b92b88 DM	138	RT_SCOPE_UNIVERSE, proto,
	139	sk ? inet_sk_flowi_flags(sk) : 0,
	140	daddr, saddr, dport, sport);
78fbfd8a	141	if (sk)
31e4543d DM	142	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
31e4543d DM	143	return ip_route_output_flow(net, fl4, sk);
78fbfd8a DM	144	}
78fbfd8a DM	145
cbb1e85f	146	static inline struct rtable ip_route_output_gre(struct net net, struct flowi4 *fl4,
78fbfd8a DM	147	__be32 daddr, __be32 saddr,
	148	__be32 gre_key, __u8 tos, int oif)
	149	{
cbb1e85f DM	150	memset(fl4, 0, sizeof(*fl4));
	151	fl4->flowi4_oif = oif;
	152	fl4->daddr = daddr;
	153	fl4->saddr = saddr;
	154	fl4->flowi4_tos = tos;
	155	fl4->flowi4_proto = IPPROTO_GRE;
	156	fl4->fl4_gre_key = gre_key;
	157	return ip_route_output_key(net, fl4);
78fbfd8a DM	158	}
78fbfd8a DM	159
2702c4bb JP	160	int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
2702c4bb JP	161	u8 tos, struct net_device *devin);
c6cffba4 DM	162
	163	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	164	u8 tos, struct net_device *devin)
	165	{
	166	int err;
	167
	168	rcu_read_lock();
	169	err = ip_route_input_noref(skb, dst, src, tos, devin);
	170	if (!err)
	171	skb_dst_force(skb);
	172	rcu_read_unlock();
	173
	174	return err;
	175	}
407eadd9	176
2702c4bb JP	177	void ipv4_update_pmtu(struct sk_buff skb, struct net net, u32 mtu, int oif,
	178	u32 mark, u8 protocol, int flow_flags);
	179	void ipv4_sk_update_pmtu(struct sk_buff skb, struct sock sk, u32 mtu);
	180	void ipv4_redirect(struct sk_buff skb, struct net net, int oif, u32 mark,
	181	u8 protocol, int flow_flags);
	182	void ipv4_sk_redirect(struct sk_buff skb, struct sock sk);
	183	void ip_rt_send_redirect(struct sk_buff *skb);
	184
	185	unsigned int inet_addr_type(struct net *net, __be32 addr);
	186	unsigned int inet_dev_addr_type(struct net net, const struct net_device dev,
	187	__be32 addr);
	188	void ip_rt_multicast_event(struct in_device *);
	189	int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
	190	void ip_rt_get_source(u8 src, struct sk_buff skb, struct rtable *rt);
	191	int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
1da177e4	192
0ff60a45	193	struct in_ifaddr;
2702c4bb JP	194	void fib_add_ifaddr(struct in_ifaddr *);
2702c4bb JP	195	void fib_del_ifaddr(struct in_ifaddr , struct in_ifaddr );
0ff60a45	196
6da025fa	197	static inline void ip_rt_put(struct rtable *rt)
1da177e4	198	{
6da025fa ED	199	/* dst_release() accepts a NULL parameter.
	200	* We rely on dst being first structure in struct rtable
	201	*/
	202	BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
	203	dst_release(&rt->dst);
1da177e4 LT	204	}
	205
	206	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	207
4839c52b	208	extern const __u8 ip_tos2prio[16];
1da177e4 LT	209
	210	static inline char rt_tos2priority(u8 tos)
	211	{
	212	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	213	}
	214
2d7192d6 DM	215	/* ip_route_connect() and ip_route_newports() work in tandem whilst
	216	* binding a socket for a new outgoing connection.
	217	*
	218	* In order to use IPSEC properly, we must, in the end, have a
	219	* route that was looked up using all available keys including source
	220	* and destination ports.
	221	*
	222	* However, if a source port needs to be allocated (the user specified
	223	* a wildcard source port) we need to obtain addressing information
	224	* in order to perform that allocation.
	225	*
	226	* So ip_route_connect() looks up a route using wildcarded source and
	227	* destination ports in the key, simply so that we can get a pair of
	228	* addresses to use for port allocation.
	229	*
	230	* Later, once the ports are allocated, ip_route_newports() will make
	231	* another route lookup if needed to make sure we catch any IPSEC
	232	* rules keyed on the port information.
	233	*
	234	* The callers allocate the flow key on their stack, and must pass in
	235	* the same flowi4 object to both the ip_route_connect() and the
	236	* ip_route_newports() calls.
	237	*/
	238
	239	static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
	240	u32 tos, int oif, u8 protocol,
	241	__be16 sport, __be16 dport,
0e0d44ab	242	struct sock *sk)
1da177e4	243	{
2d7192d6	244	__u8 flow_flags = 0;
79876874 KK	245
79876874 KK	246	if (inet_sk(sk)->transparent)
94b92b88	247	flow_flags \|= FLOWI_FLAG_ANYSRC;
94b92b88	248
2d7192d6	249	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
94b92b88	250	protocol, flow_flags, dst, src, dport, sport);
2d7192d6 DM	251	}
	252
	253	static inline struct rtable ip_route_connect(struct flowi4 fl4,
	254	__be32 dst, __be32 src, u32 tos,
	255	int oif, u8 protocol,
	256	__be16 sport, __be16 dport,
0e0d44ab	257	struct sock *sk)
2d7192d6 DM	258	{
	259	struct net *net = sock_net(sk);
	260	struct rtable *rt;
	261
	262	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
0e0d44ab	263	sport, dport, sk);
79876874	264
1da177e4	265	if (!dst \|\| !src) {
2d7192d6	266	rt = __ip_route_output_key(net, fl4);
b23dd4fe DM	267	if (IS_ERR(rt))
b23dd4fe DM	268	return rt;
b23dd4fe	269	ip_rt_put(rt);
e6b45241	270	flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
1da177e4	271	}
2d7192d6 DM	272	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	273	return ip_route_output_flow(net, fl4, sk);
1da177e4 LT	274	}
1da177e4 LT	275
2d7192d6 DM	276	static inline struct rtable ip_route_newports(struct flowi4 fl4, struct rtable *rt,
	277	__be16 orig_sport, __be16 orig_dport,
	278	__be16 sport, __be16 dport,
	279	struct sock *sk)
1da177e4	280	{
dca8b089	281	if (sport != orig_sport \|\| dport != orig_dport) {
2d7192d6 DM	282	fl4->fl4_dport = dport;
2d7192d6 DM	283	fl4->fl4_sport = sport;
b23dd4fe	284	ip_rt_put(rt);
e6b45241 JA	285	flowi4_update_output(fl4, sk->sk_bound_dev_if,
	286	RT_CONN_FLAGS(sk), fl4->daddr,
	287	fl4->saddr);
2d7192d6 DM	288	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	289	return ip_route_output_flow(sock_net(sk), fl4, sk);
1da177e4	290	}
b23dd4fe	291	return rt;
1da177e4 LT	292	}
1da177e4 LT	293
1668e010 KK	294	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	295	{
13378cad DM	296	int iif = skb_rtable(skb)->rt_iif;
	297
	298	if (iif)
	299	return iif;
	300	return skb->skb_iif;
1668e010 KK	301	}
1668e010 KK	302
323e126f DM	303	extern int sysctl_ip_default_ttl;
	304
	305	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	306	{
	307	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	308
	309	if (hoplimit == 0)
	310	hoplimit = sysctl_ip_default_ttl;
	311	return hoplimit;
	312	}
	313
482fc609	314	static inline bool ip_sk_accept_pmtu(const struct sock *sk)
0ea9d5e3	315	{
482fc609 HFS	316	return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE;
482fc609 HFS	317	}
0ea9d5e3	318
482fc609 HFS	319	static inline bool ip_sk_use_pmtu(const struct sock *sk)
	320	{
	321	return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
	322	}
	323
	324	static inline int ip_skb_dst_mtu(const struct sk_buff *skb)
	325	{
	326	return (!skb->sk \|\| ip_sk_use_pmtu(skb->sk)) ?
	327	dst_mtu(skb_dst(skb)) : skb_dst(skb)->dev->mtu;
0ea9d5e3 HFS	328	}
0ea9d5e3 HFS	329
1da177e4	330	#endif /* _ROUTE_H */