[net-next-2.6.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 rtable {
	struct dst_entry	dst;

	/* Cache lookup keys */
	struct flowi		fl;

	int			rt_genid;
	unsigned		rt_flags;
	__u16			rt_type;

	__be32			rt_dst;	/* Path destination	*/
	__be32			rt_src;	/* Path source		*/
	int			rt_iif;

	/* Info on neighbour */
	__be32			rt_gateway;

	/* Miscellaneous cached information */
	__be32			rt_spec_dst; /* RFC1122 specific destination */
	struct inet_peer	*peer; /* long-living peer info */
};

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(void);
extern int		__ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
extern int		ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
extern int		ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);

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 int ip_route_connect(struct rtable **rp, __be32 dst,
				   __be32 src, u32 tos, int oif, u8 protocol,
				   __be16 sport, __be16 dport, struct sock *sk,
				   int flags)
{
	struct flowi fl = { .oif = oif,
			    .mark = sk->sk_mark,
			    .nl_u = { .ip4_u = { .daddr = dst,
						 .saddr = src,
						 .tos   = tos } },
			    .proto = protocol,
			    .uli_u = { .ports =
				       { .sport = sport,
					 .dport = dport } } };

	int err;
	struct net *net = sock_net(sk);

	if (inet_sk(sk)->transparent)
		fl.flags |= FLOWI_FLAG_ANYSRC;

	if (!dst || !src) {
		err = __ip_route_output_key(net, rp, &fl);
		if (err)
			return err;
		fl.fl4_dst = (*rp)->rt_dst;
		fl.fl4_src = (*rp)->rt_src;
		ip_rt_put(*rp);
		*rp = NULL;
	}
	security_sk_classify_flow(sk, &fl);
	return ip_route_output_flow(net, rp, &fl, sk, flags);
}

static inline int ip_route_newports(struct rtable **rp, u8 protocol,
				    __be16 sport, __be16 dport, struct sock *sk)
{
	if (sport != (*rp)->fl.fl_ip_sport ||
	    dport != (*rp)->fl.fl_ip_dport) {
		struct flowi fl;

		memcpy(&fl, &(*rp)->fl, sizeof(fl));
		fl.fl_ip_sport = sport;
		fl.fl_ip_dport = dport;
		fl.proto = protocol;
		if (inet_sk(sk)->transparent)
			fl.flags |= FLOWI_FLAG_ANYSRC;
		ip_rt_put(*rp);
		*rp = NULL;
		security_sk_classify_flow(sk, &fl);
		return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
	}
	return 0;
}

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;
}

#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;
fd2c3ef7	52	struct rtable {
d8d1f30b	53	struct dst_entry dst;
1da177e4	54
093c2ca4 ED	55	/* Cache lookup keys */
	56	struct flowi fl;
	57
29e75252	58	int rt_genid;
1da177e4 LT	59	unsigned rt_flags;
1da177e4 LT	60	__u16 rt_type;
1da177e4	61
f2c3fe24 AV	62	__be32 rt_dst; /* Path destination */
f2c3fe24 AV	63	__be32 rt_src; /* Path source */
1da177e4 LT	64	int rt_iif;
	65
	66	/* Info on neighbour */
f2c3fe24	67	__be32 rt_gateway;
1da177e4	68
1da177e4	69	/* Miscellaneous cached information */
f2c3fe24	70	__be32 rt_spec_dst; /* RFC1122 specific destination */
1da177e4 LT	71	struct inet_peer peer; / long-living peer info */
	72	};
	73
fd2c3ef7	74	struct ip_rt_acct {
1da177e4 LT	75	__u32 o_bytes;
	76	__u32 o_packets;
	77	__u32 i_bytes;
	78	__u32 i_packets;
	79	};
	80
fd2c3ef7	81	struct rt_cache_stat {
1da177e4 LT	82	unsigned int in_hit;
	83	unsigned int in_slow_tot;
	84	unsigned int in_slow_mc;
	85	unsigned int in_no_route;
	86	unsigned int in_brd;
	87	unsigned int in_martian_dst;
	88	unsigned int in_martian_src;
	89	unsigned int out_hit;
	90	unsigned int out_slow_tot;
	91	unsigned int out_slow_mc;
	92	unsigned int gc_total;
	93	unsigned int gc_ignored;
	94	unsigned int gc_goal_miss;
	95	unsigned int gc_dst_overflow;
	96	unsigned int in_hlist_search;
	97	unsigned int out_hlist_search;
	98	};
	99
7d720c3e	100	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	101
	102	struct in_device;
	103	extern int ip_rt_init(void);
f7655229 AV	104	extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
f7655229 AV	105	__be32 src, struct net_device *dev);
76e6ebfb	106	extern void rt_cache_flush(struct net *net, int how);
a5ee1551	107	extern void rt_cache_flush_batch(void);
611c183e	108	extern int __ip_route_output_key(struct net , struct rtable , const struct flowi flp);
f206351a	109	extern int ip_route_output_key(struct net , struct rtable , struct flowi flp);
f1b050bf	110	extern int ip_route_output_flow(struct net , struct rtable rp, struct flowi flp, struct sock *sk, int flags);
407eadd9 ED	111
	112	extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
	113	u8 tos, struct net_device *devin, bool noref);
	114
	115	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	116	u8 tos, struct net_device *devin)
	117	{
	118	return ip_route_input_common(skb, dst, src, tos, devin, false);
	119	}
	120
	121	static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
	122	u8 tos, struct net_device *devin)
	123	{
	124	return ip_route_input_common(skb, dst, src, tos, devin, true);
	125	}
	126
0010e465	127	extern unsigned short ip_rt_frag_needed(struct net net, struct iphdr iph, unsigned short new_mtu, struct net_device *dev);
1da177e4 LT	128	extern void ip_rt_send_redirect(struct sk_buff *skb);
1da177e4 LT	129
6b175b26 EB	130	extern unsigned inet_addr_type(struct net *net, __be32 addr);
6b175b26 EB	131	extern unsigned inet_dev_addr_type(struct net net, const struct net_device dev, __be32 addr);
1da177e4	132	extern void ip_rt_multicast_event(struct in_device *);
1bad118a	133	extern int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
1da177e4 LT	134	extern void ip_rt_get_source(u8 src, struct rtable rt);
	135	extern int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
	136
0ff60a45 JHS	137	struct in_ifaddr;
	138	extern void fib_add_ifaddr(struct in_ifaddr *);
	139
1da177e4 LT	140	static inline void ip_rt_put(struct rtable * rt)
	141	{
	142	if (rt)
d8d1f30b	143	dst_release(&rt->dst);
1da177e4 LT	144	}
	145
	146	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	147
4839c52b	148	extern const __u8 ip_tos2prio[16];
1da177e4 LT	149
	150	static inline char rt_tos2priority(u8 tos)
	151	{
	152	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	153	}
	154
bada8adc AV	155	static inline int ip_route_connect(struct rtable **rp, __be32 dst,
bada8adc AV	156	__be32 src, u32 tos, int oif, u8 protocol,
8eb9086f DM	157	__be16 sport, __be16 dport, struct sock *sk,
8eb9086f DM	158	int flags)
1da177e4 LT	159	{
1da177e4 LT	160	struct flowi fl = { .oif = oif,
4a19ec58	161	.mark = sk->sk_mark,
1da177e4 LT	162	.nl_u = { .ip4_u = { .daddr = dst,
	163	.saddr = src,
	164	.tos = tos } },
	165	.proto = protocol,
	166	.uli_u = { .ports =
	167	{ .sport = sport,
	168	.dport = dport } } };
	169
	170	int err;
3b1e0a65	171	struct net *net = sock_net(sk);
79876874 KK	172
	173	if (inet_sk(sk)->transparent)
	174	fl.flags \|= FLOWI_FLAG_ANYSRC;
	175
1da177e4	176	if (!dst \|\| !src) {
eee80592	177	err = __ip_route_output_key(net, rp, &fl);
1da177e4 LT	178	if (err)
	179	return err;
	180	fl.fl4_dst = (*rp)->rt_dst;
	181	fl.fl4_src = (*rp)->rt_src;
	182	ip_rt_put(*rp);
	183	*rp = NULL;
	184	}
beb8d13b	185	security_sk_classify_flow(sk, &fl);
eee80592	186	return ip_route_output_flow(net, rp, &fl, sk, flags);
1da177e4 LT	187	}
1da177e4 LT	188
5d39a795	189	static inline int ip_route_newports(struct rtable **rp, u8 protocol,
39dccd9d	190	__be16 sport, __be16 dport, struct sock *sk)
1da177e4 LT	191	{
	192	if (sport != (*rp)->fl.fl_ip_sport \|\|
	193	dport != (*rp)->fl.fl_ip_dport) {
	194	struct flowi fl;
	195
	196	memcpy(&fl, &(*rp)->fl, sizeof(fl));
	197	fl.fl_ip_sport = sport;
	198	fl.fl_ip_dport = dport;
5d39a795	199	fl.proto = protocol;
fb0c5f0b UW	200	if (inet_sk(sk)->transparent)
fb0c5f0b UW	201	fl.flags \|= FLOWI_FLAG_ANYSRC;
1da177e4 LT	202	ip_rt_put(*rp);
1da177e4 LT	203	*rp = NULL;
beb8d13b	204	security_sk_classify_flow(sk, &fl);
3b1e0a65	205	return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
1da177e4 LT	206	}
	207	return 0;
	208	}
	209
	210	extern void rt_bind_peer(struct rtable *rt, int create);
	211
	212	static inline struct inet_peer rt_get_peer(struct rtable rt)
	213	{
	214	if (rt->peer)
	215	return rt->peer;
	216
	217	rt_bind_peer(rt, 0);
	218	return rt->peer;
	219	}
	220
1668e010 KK	221	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	222	{
511c3f92	223	return skb_rtable(skb)->rt_iif;
1668e010 KK	224	}
1668e010 KK	225
1da177e4	226	#endif /* _ROUTE_H */