[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/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 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 int		rt_flags;
	__u16			rt_type;
	__u8			rt_key_tos;

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

	/* Info on neighbour */
	__be32			rt_gateway;

	/* Miscellaneous cached information */
	u32			rt_peer_genid;
	unsigned long		_peer; /* long-living peer info */
	struct fib_info		*fi; /* for client ref to shared metrics */
};

static inline struct inet_peer *rt_peer_ptr(struct rtable *rt)
{
	return inetpeer_ptr(rt->_peer);
}

static inline bool rt_has_peer(struct rtable *rt)
{
	return inetpeer_ptr_is_peer(rt->_peer);
}

static inline void __rt_set_peer(struct rtable *rt, struct inet_peer *peer)
{
	__inetpeer_ptr_set_peer(&rt->_peer, peer);
}

static inline bool rt_set_peer(struct rtable *rt, struct inet_peer *peer)
{
	return inetpeer_ptr_set_peer(&rt->_peer, peer);
}

static inline void rt_init_peer(struct rtable *rt, struct inet_peer_base *base)
{
	inetpeer_init_ptr(&rt->_peer, base);
}

static inline void rt_transfer_peer(struct rtable *rt, struct rtable *ort)
{
	rt->_peer = ort->_peer;
	if (rt_has_peer(ort)) {
		struct inet_peer *peer = rt_peer_ptr(ort);
		atomic_inc(&peer->refcnt);
	}
}

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

static inline bool rt_is_output_route(const struct rtable *rt)
{
	return rt->rt_route_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 *, 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_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 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 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;
}

extern void rt_bind_peer(struct rtable *rt, __be32 daddr, int create);

static inline struct inet_peer *__rt_get_peer(struct rtable *rt, __be32 daddr, int create)
{
	if (rt_has_peer(rt))
		return rt_peer_ptr(rt);

	rt_bind_peer(rt, daddr, create);
	return (rt_has_peer(rt) ? rt_peer_ptr(rt) : NULL);
}

static inline struct inet_peer *rt_get_peer(struct rtable *rt, __be32 daddr)
{
	return __rt_get_peer(rt, daddr, 0);
}

static inline struct inet_peer *rt_get_peer_create(struct rtable *rt, __be32 daddr)
{
	return __rt_get_peer(rt, daddr, 1);
}

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	37
1da177e4 LT	38	#define RTO_ONLINK 0x01
1da177e4 LT	39
1da177e4 LT	40	#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) \| sock_flag(sk, SOCK_LOCALROUTE))
	41
	42	struct fib_nh;
	43	struct inet_peer;
62fa8a84	44	struct fib_info;
fd2c3ef7	45	struct rtable {
d8d1f30b	46	struct dst_entry dst;
1da177e4	47
5e2b61f7 DM	48	/* Lookup key. */
	49	__be32 rt_key_dst;
	50	__be32 rt_key_src;
093c2ca4	51
29e75252	52	int rt_genid;
95c96174	53	unsigned int rt_flags;
1da177e4	54	__u16 rt_type;
475949d8	55	__u8 rt_key_tos;
1da177e4	56
f2c3fe24 AV	57	__be32 rt_dst; /* Path destination */
f2c3fe24 AV	58	__be32 rt_src; /* Path source */
1b86a58f	59	int rt_route_iif;
1da177e4	60	int rt_iif;
5e2b61f7 DM	61	int rt_oif;
5e2b61f7 DM	62	__u32 rt_mark;
1da177e4 LT	63
1da177e4 LT	64	/* Info on neighbour */
f2c3fe24	65	__be32 rt_gateway;
1da177e4	66
1da177e4	67	/* Miscellaneous cached information */
6431cbc2	68	u32 rt_peer_genid;
97bab73f	69	unsigned long _peer; /* long-living peer info */
62fa8a84	70	struct fib_info fi; / for client ref to shared metrics */
1da177e4 LT	71	};
1da177e4 LT	72
97bab73f DM	73	static inline struct inet_peer rt_peer_ptr(struct rtable rt)
	74	{
	75	return inetpeer_ptr(rt->_peer);
	76	}
	77
	78	static inline bool rt_has_peer(struct rtable *rt)
	79	{
	80	return inetpeer_ptr_is_peer(rt->_peer);
	81	}
	82
	83	static inline void __rt_set_peer(struct rtable rt, struct inet_peer peer)
	84	{
	85	__inetpeer_ptr_set_peer(&rt->_peer, peer);
	86	}
	87
	88	static inline bool rt_set_peer(struct rtable rt, struct inet_peer peer)
	89	{
	90	return inetpeer_ptr_set_peer(&rt->_peer, peer);
	91	}
	92
	93	static inline void rt_init_peer(struct rtable rt, struct inet_peer_base base)
	94	{
	95	inetpeer_init_ptr(&rt->_peer, base);
	96	}
	97
	98	static inline void rt_transfer_peer(struct rtable rt, struct rtable ort)
	99	{
	100	rt->_peer = ort->_peer;
	101	if (rt_has_peer(ort)) {
	102	struct inet_peer *peer = rt_peer_ptr(ort);
	103	atomic_inc(&peer->refcnt);
	104	}
	105	}
	106
b8400f37	107	static inline bool rt_is_input_route(const struct rtable *rt)
c7537967	108	{
1b86a58f	109	return rt->rt_route_iif != 0;
c7537967 DM	110	}
c7537967 DM	111
b8400f37	112	static inline bool rt_is_output_route(const struct rtable *rt)
c7537967	113	{
1b86a58f	114	return rt->rt_route_iif == 0;
c7537967 DM	115	}
c7537967 DM	116
fd2c3ef7	117	struct ip_rt_acct {
1da177e4 LT	118	__u32 o_bytes;
	119	__u32 o_packets;
	120	__u32 i_bytes;
	121	__u32 i_packets;
	122	};
	123
fd2c3ef7	124	struct rt_cache_stat {
1da177e4 LT	125	unsigned int in_hit;
	126	unsigned int in_slow_tot;
	127	unsigned int in_slow_mc;
	128	unsigned int in_no_route;
	129	unsigned int in_brd;
	130	unsigned int in_martian_dst;
	131	unsigned int in_martian_src;
	132	unsigned int out_hit;
	133	unsigned int out_slow_tot;
	134	unsigned int out_slow_mc;
	135	unsigned int gc_total;
	136	unsigned int gc_ignored;
	137	unsigned int gc_goal_miss;
	138	unsigned int gc_dst_overflow;
	139	unsigned int in_hlist_search;
	140	unsigned int out_hlist_search;
	141	};
	142
7d720c3e	143	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	144
	145	struct in_device;
	146	extern int ip_rt_init(void);
f7655229 AV	147	extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
f7655229 AV	148	__be32 src, struct net_device *dev);
76e6ebfb	149	extern void rt_cache_flush(struct net *net, int how);
6561a3b1	150	extern void rt_cache_flush_batch(struct net *net);
813b3b5d	151	extern struct rtable __ip_route_output_key(struct net , struct flowi4 *flp);
9d6ec938	152	extern struct rtable ip_route_output_flow(struct net , struct flowi4 *flp,
b23dd4fe	153	struct sock *sk);
2774c131	154	extern struct dst_entry ipv4_blackhole_route(struct net net, struct dst_entry *dst_orig);
407eadd9	155
9d6ec938	156	static inline struct rtable ip_route_output_key(struct net net, struct flowi4 *flp)
5bfa787f DM	157	{
	158	return ip_route_output_flow(net, flp, NULL);
	159	}
	160
78fbfd8a DM	161	static inline struct rtable ip_route_output(struct net net, __be32 daddr,
	162	__be32 saddr, u8 tos, int oif)
	163	{
9d6ec938 DM	164	struct flowi4 fl4 = {
9d6ec938 DM	165	.flowi4_oif = oif,
c5d21c4b	166	.flowi4_tos = tos,
9d6ec938 DM	167	.daddr = daddr,
9d6ec938 DM	168	.saddr = saddr,
78fbfd8a	169	};
9d6ec938	170	return ip_route_output_key(net, &fl4);
78fbfd8a DM	171	}
78fbfd8a DM	172
31e4543d DM	173	static inline struct rtable ip_route_output_ports(struct net net, struct flowi4 *fl4,
31e4543d DM	174	struct sock *sk,
78fbfd8a DM	175	__be32 daddr, __be32 saddr,
	176	__be16 dport, __be16 sport,
	177	__u8 proto, __u8 tos, int oif)
	178	{
31e4543d	179	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
94b92b88 DM	180	RT_SCOPE_UNIVERSE, proto,
	181	sk ? inet_sk_flowi_flags(sk) : 0,
	182	daddr, saddr, dport, sport);
78fbfd8a	183	if (sk)
31e4543d DM	184	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
31e4543d DM	185	return ip_route_output_flow(net, fl4, sk);
78fbfd8a DM	186	}
78fbfd8a DM	187
cbb1e85f	188	static inline struct rtable ip_route_output_gre(struct net net, struct flowi4 *fl4,
78fbfd8a DM	189	__be32 daddr, __be32 saddr,
	190	__be32 gre_key, __u8 tos, int oif)
	191	{
cbb1e85f DM	192	memset(fl4, 0, sizeof(*fl4));
	193	fl4->flowi4_oif = oif;
	194	fl4->daddr = daddr;
	195	fl4->saddr = saddr;
	196	fl4->flowi4_tos = tos;
	197	fl4->flowi4_proto = IPPROTO_GRE;
	198	fl4->fl4_gre_key = gre_key;
	199	return ip_route_output_key(net, fl4);
78fbfd8a DM	200	}
78fbfd8a DM	201
407eadd9	202	extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
c10237e0	203	u8 tos, struct net_device *devin, bool noref);
407eadd9 ED	204
	205	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	206	u8 tos, struct net_device *devin)
	207	{
c10237e0	208	return ip_route_input_common(skb, dst, src, tos, devin, false);
407eadd9 ED	209	}
	210
	211	static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
c10237e0	212	u8 tos, struct net_device *devin)
407eadd9	213	{
c10237e0	214	return ip_route_input_common(skb, dst, src, tos, devin, true);
407eadd9 ED	215	}
407eadd9 ED	216
36393395 DM	217	extern void ipv4_update_pmtu(struct sk_buff skb, struct net net, u32 mtu,
	218	int oif, u32 mark, u8 protocol, int flow_flags);
	219	extern void ipv4_sk_update_pmtu(struct sk_buff skb, struct sock sk, u32 mtu);
	220	extern void ip_rt_send_redirect(struct sk_buff *skb);
1da177e4	221
95c96174 ED	222	extern unsigned int inet_addr_type(struct net *net, __be32 addr);
95c96174 ED	223	extern unsigned int inet_dev_addr_type(struct net net, const struct net_device dev, __be32 addr);
1da177e4	224	extern void ip_rt_multicast_event(struct in_device *);
1bad118a	225	extern int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
8e36360a	226	extern void ip_rt_get_source(u8 src, struct sk_buff skb, struct rtable *rt);
1da177e4 LT	227	extern int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
1da177e4 LT	228
0ff60a45 JHS	229	struct in_ifaddr;
0ff60a45 JHS	230	extern void fib_add_ifaddr(struct in_ifaddr *);
e6abbaa2	231	extern void fib_del_ifaddr(struct in_ifaddr , struct in_ifaddr );
0ff60a45	232
1da177e4 LT	233	static inline void ip_rt_put(struct rtable * rt)
	234	{
	235	if (rt)
d8d1f30b	236	dst_release(&rt->dst);
1da177e4 LT	237	}
	238
	239	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	240
4839c52b	241	extern const __u8 ip_tos2prio[16];
1da177e4 LT	242
	243	static inline char rt_tos2priority(u8 tos)
	244	{
	245	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	246	}
	247
2d7192d6 DM	248	/* ip_route_connect() and ip_route_newports() work in tandem whilst
	249	* binding a socket for a new outgoing connection.
	250	*
	251	* In order to use IPSEC properly, we must, in the end, have a
	252	* route that was looked up using all available keys including source
	253	* and destination ports.
	254	*
	255	* However, if a source port needs to be allocated (the user specified
	256	* a wildcard source port) we need to obtain addressing information
	257	* in order to perform that allocation.
	258	*
	259	* So ip_route_connect() looks up a route using wildcarded source and
	260	* destination ports in the key, simply so that we can get a pair of
	261	* addresses to use for port allocation.
	262	*
	263	* Later, once the ports are allocated, ip_route_newports() will make
	264	* another route lookup if needed to make sure we catch any IPSEC
	265	* rules keyed on the port information.
	266	*
	267	* The callers allocate the flow key on their stack, and must pass in
	268	* the same flowi4 object to both the ip_route_connect() and the
	269	* ip_route_newports() calls.
	270	*/
	271
	272	static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
	273	u32 tos, int oif, u8 protocol,
	274	__be16 sport, __be16 dport,
	275	struct sock *sk, bool can_sleep)
1da177e4	276	{
2d7192d6	277	__u8 flow_flags = 0;
79876874 KK	278
79876874 KK	279	if (inet_sk(sk)->transparent)
94b92b88	280	flow_flags \|= FLOWI_FLAG_ANYSRC;
5df65e55	281	if (can_sleep)
94b92b88 DM	282	flow_flags \|= FLOWI_FLAG_CAN_SLEEP;
94b92b88 DM	283
2d7192d6	284	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
94b92b88	285	protocol, flow_flags, dst, src, dport, sport);
2d7192d6 DM	286	}
	287
	288	static inline struct rtable ip_route_connect(struct flowi4 fl4,
	289	__be32 dst, __be32 src, u32 tos,
	290	int oif, u8 protocol,
	291	__be16 sport, __be16 dport,
	292	struct sock *sk, bool can_sleep)
	293	{
	294	struct net *net = sock_net(sk);
	295	struct rtable *rt;
	296
	297	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
	298	sport, dport, sk, can_sleep);
79876874	299
1da177e4	300	if (!dst \|\| !src) {
2d7192d6	301	rt = __ip_route_output_key(net, fl4);
b23dd4fe DM	302	if (IS_ERR(rt))
b23dd4fe DM	303	return rt;
b23dd4fe	304	ip_rt_put(rt);
e6b45241	305	flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
1da177e4	306	}
2d7192d6 DM	307	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	308	return ip_route_output_flow(net, fl4, sk);
1da177e4 LT	309	}
1da177e4 LT	310
2d7192d6 DM	311	static inline struct rtable ip_route_newports(struct flowi4 fl4, struct rtable *rt,
	312	__be16 orig_sport, __be16 orig_dport,
	313	__be16 sport, __be16 dport,
	314	struct sock *sk)
1da177e4	315	{
dca8b089	316	if (sport != orig_sport \|\| dport != orig_dport) {
2d7192d6 DM	317	fl4->fl4_dport = dport;
2d7192d6 DM	318	fl4->fl4_sport = sport;
b23dd4fe	319	ip_rt_put(rt);
e6b45241 JA	320	flowi4_update_output(fl4, sk->sk_bound_dev_if,
	321	RT_CONN_FLAGS(sk), fl4->daddr,
	322	fl4->saddr);
2d7192d6 DM	323	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
2d7192d6 DM	324	return ip_route_output_flow(sock_net(sk), fl4, sk);
1da177e4	325	}
b23dd4fe	326	return rt;
1da177e4 LT	327	}
1da177e4 LT	328
a48eff12	329	extern void rt_bind_peer(struct rtable *rt, __be32 daddr, int create);
1da177e4	330
fbfe95a4	331	static inline struct inet_peer __rt_get_peer(struct rtable rt, __be32 daddr, int create)
1da177e4	332	{
97bab73f DM	333	if (rt_has_peer(rt))
97bab73f DM	334	return rt_peer_ptr(rt);
1da177e4	335
fbfe95a4	336	rt_bind_peer(rt, daddr, create);
55afabaa	337	return (rt_has_peer(rt) ? rt_peer_ptr(rt) : NULL);
1da177e4 LT	338	}
1da177e4 LT	339
fbfe95a4 DM	340	static inline struct inet_peer rt_get_peer(struct rtable rt, __be32 daddr)
	341	{
	342	return __rt_get_peer(rt, daddr, 0);
	343	}
	344
	345	static inline struct inet_peer rt_get_peer_create(struct rtable rt, __be32 daddr)
	346	{
	347	return __rt_get_peer(rt, daddr, 1);
	348	}
	349
1668e010 KK	350	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	351	{
511c3f92	352	return skb_rtable(skb)->rt_iif;
1668e010 KK	353	}
1668e010 KK	354
323e126f DM	355	extern int sysctl_ip_default_ttl;
	356
	357	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	358	{
	359	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	360
	361	if (hoplimit == 0)
	362	hoplimit = sysctl_ip_default_ttl;
	363	return hoplimit;
	364	}
	365
1da177e4	366	#endif /* _ROUTE_H */