[linux-2.6-block.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 fib_info;
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 fib_info		*fi; /* for client ref to shared metrics */
};

static inline bool rt_is_input_route(struct rtable *rt)
{
	return rt->fl.iif != 0;
}

static inline bool rt_is_output_route(struct rtable *rt)
{
	return rt->fl.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 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,
			    .fl4_dst = dst,
			    .fl4_src = src,
			    .fl4_tos = tos,
			    .proto = protocol,
			    .fl_ip_sport = sport,
			    .fl_ip_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;
}

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 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;
62fa8a84	52	struct fib_info;
fd2c3ef7	53	struct rtable {
d8d1f30b	54	struct dst_entry dst;
1da177e4	55
093c2ca4 ED	56	/* Cache lookup keys */
	57	struct flowi fl;
	58
29e75252	59	int rt_genid;
1da177e4 LT	60	unsigned rt_flags;
1da177e4 LT	61	__u16 rt_type;
1da177e4	62
f2c3fe24 AV	63	__be32 rt_dst; /* Path destination */
f2c3fe24 AV	64	__be32 rt_src; /* Path source */
1da177e4 LT	65	int rt_iif;
	66
	67	/* Info on neighbour */
f2c3fe24	68	__be32 rt_gateway;
1da177e4	69
1da177e4	70	/* Miscellaneous cached information */
f2c3fe24	71	__be32 rt_spec_dst; /* RFC1122 specific destination */
1da177e4	72	struct inet_peer peer; / long-living peer info */
62fa8a84	73	struct fib_info fi; / for client ref to shared metrics */
1da177e4 LT	74	};
1da177e4 LT	75
c7537967 DM	76	static inline bool rt_is_input_route(struct rtable *rt)
	77	{
	78	return rt->fl.iif != 0;
	79	}
	80
	81	static inline bool rt_is_output_route(struct rtable *rt)
	82	{
	83	return rt->fl.iif == 0;
	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_hit;
	95	unsigned int in_slow_tot;
	96	unsigned int in_slow_mc;
	97	unsigned int in_no_route;
	98	unsigned int in_brd;
	99	unsigned int in_martian_dst;
	100	unsigned int in_martian_src;
	101	unsigned int out_hit;
	102	unsigned int out_slow_tot;
	103	unsigned int out_slow_mc;
	104	unsigned int gc_total;
	105	unsigned int gc_ignored;
	106	unsigned int gc_goal_miss;
	107	unsigned int gc_dst_overflow;
	108	unsigned int in_hlist_search;
	109	unsigned int out_hlist_search;
	110	};
	111
7d720c3e	112	extern struct ip_rt_acct __percpu *ip_rt_acct;
1da177e4 LT	113
	114	struct in_device;
	115	extern int ip_rt_init(void);
f7655229 AV	116	extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
f7655229 AV	117	__be32 src, struct net_device *dev);
76e6ebfb	118	extern void rt_cache_flush(struct net *net, int how);
6561a3b1	119	extern void rt_cache_flush_batch(struct net *net);
611c183e	120	extern int __ip_route_output_key(struct net , struct rtable , const struct flowi flp);
f206351a	121	extern int ip_route_output_key(struct net , struct rtable , struct flowi flp);
f1b050bf	122	extern int ip_route_output_flow(struct net , struct rtable rp, struct flowi flp, struct sock *sk, int flags);
407eadd9 ED	123
	124	extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
	125	u8 tos, struct net_device *devin, bool noref);
	126
	127	static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
	128	u8 tos, struct net_device *devin)
	129	{
	130	return ip_route_input_common(skb, dst, src, tos, devin, false);
	131	}
	132
	133	static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
	134	u8 tos, struct net_device *devin)
	135	{
	136	return ip_route_input_common(skb, dst, src, tos, devin, true);
	137	}
	138
0010e465	139	extern unsigned short ip_rt_frag_needed(struct net net, struct iphdr iph, unsigned short new_mtu, struct net_device *dev);
1da177e4 LT	140	extern void ip_rt_send_redirect(struct sk_buff *skb);
1da177e4 LT	141
6b175b26 EB	142	extern unsigned inet_addr_type(struct net *net, __be32 addr);
6b175b26 EB	143	extern unsigned inet_dev_addr_type(struct net net, const struct net_device dev, __be32 addr);
1da177e4	144	extern void ip_rt_multicast_event(struct in_device *);
1bad118a	145	extern int ip_rt_ioctl(struct net , unsigned int cmd, void __user arg);
1da177e4 LT	146	extern void ip_rt_get_source(u8 src, struct rtable rt);
	147	extern int ip_rt_dump(struct sk_buff skb, struct netlink_callback cb);
	148
0ff60a45 JHS	149	struct in_ifaddr;
	150	extern void fib_add_ifaddr(struct in_ifaddr *);
	151
1da177e4 LT	152	static inline void ip_rt_put(struct rtable * rt)
	153	{
	154	if (rt)
d8d1f30b	155	dst_release(&rt->dst);
1da177e4 LT	156	}
	157
	158	#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
	159
4839c52b	160	extern const __u8 ip_tos2prio[16];
1da177e4 LT	161
	162	static inline char rt_tos2priority(u8 tos)
	163	{
	164	return ip_tos2prio[IPTOS_TOS(tos)>>1];
	165	}
	166
bada8adc AV	167	static inline int ip_route_connect(struct rtable **rp, __be32 dst,
bada8adc AV	168	__be32 src, u32 tos, int oif, u8 protocol,
8eb9086f DM	169	__be16 sport, __be16 dport, struct sock *sk,
8eb9086f DM	170	int flags)
1da177e4 LT	171	{
1da177e4 LT	172	struct flowi fl = { .oif = oif,
4a19ec58	173	.mark = sk->sk_mark,
5811662b CG	174	.fl4_dst = dst,
	175	.fl4_src = src,
	176	.fl4_tos = tos,
1da177e4	177	.proto = protocol,
5811662b CG	178	.fl_ip_sport = sport,
5811662b CG	179	.fl_ip_dport = dport };
1da177e4	180	int err;
3b1e0a65	181	struct net *net = sock_net(sk);
79876874 KK	182
	183	if (inet_sk(sk)->transparent)
	184	fl.flags \|= FLOWI_FLAG_ANYSRC;
	185
1da177e4	186	if (!dst \|\| !src) {
eee80592	187	err = __ip_route_output_key(net, rp, &fl);
1da177e4 LT	188	if (err)
	189	return err;
	190	fl.fl4_dst = (*rp)->rt_dst;
	191	fl.fl4_src = (*rp)->rt_src;
	192	ip_rt_put(*rp);
	193	*rp = NULL;
	194	}
beb8d13b	195	security_sk_classify_flow(sk, &fl);
eee80592	196	return ip_route_output_flow(net, rp, &fl, sk, flags);
1da177e4 LT	197	}
1da177e4 LT	198
5d39a795	199	static inline int ip_route_newports(struct rtable **rp, u8 protocol,
39dccd9d	200	__be16 sport, __be16 dport, struct sock *sk)
1da177e4 LT	201	{
	202	if (sport != (*rp)->fl.fl_ip_sport \|\|
	203	dport != (*rp)->fl.fl_ip_dport) {
	204	struct flowi fl;
	205
	206	memcpy(&fl, &(*rp)->fl, sizeof(fl));
	207	fl.fl_ip_sport = sport;
	208	fl.fl_ip_dport = dport;
5d39a795	209	fl.proto = protocol;
fb0c5f0b UW	210	if (inet_sk(sk)->transparent)
fb0c5f0b UW	211	fl.flags \|= FLOWI_FLAG_ANYSRC;
1da177e4 LT	212	ip_rt_put(*rp);
1da177e4 LT	213	*rp = NULL;
beb8d13b	214	security_sk_classify_flow(sk, &fl);
3b1e0a65	215	return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
1da177e4 LT	216	}
	217	return 0;
	218	}
	219
	220	extern void rt_bind_peer(struct rtable *rt, int create);
	221
	222	static inline struct inet_peer rt_get_peer(struct rtable rt)
	223	{
	224	if (rt->peer)
	225	return rt->peer;
	226
	227	rt_bind_peer(rt, 0);
	228	return rt->peer;
	229	}
	230
1668e010 KK	231	static inline int inet_iif(const struct sk_buff *skb)
1668e010 KK	232	{
511c3f92	233	return skb_rtable(skb)->rt_iif;
1668e010 KK	234	}
1668e010 KK	235
323e126f DM	236	extern int sysctl_ip_default_ttl;
	237
	238	static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
	239	{
	240	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
	241
	242	if (hoplimit == 0)
	243	hoplimit = sysctl_ip_default_ttl;
	244	return hoplimit;
	245	}
	246
1da177e4	247	#endif /* _ROUTE_H */