/* * 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 <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{	union	{		struct dst_entry	dst;	} u; 	/* Cache lookup keys */	struct flowi		fl; 	struct in_device	*idev;		unsigned		rt_flags;	__u16			rt_type;	__u16			rt_multipath_alg; 	__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 *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		ip_rt_advice(struct rtable **rp, int advice);extern void		rt_cache_flush(int how);extern int		__ip_route_output_key(struct rtable **, const struct flowi *flp);extern int		ip_route_output_key(struct rtable **, struct flowi *flp);extern int		ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);extern int		ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);extern unsigned short	ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);extern void		ip_rt_send_redirect(struct sk_buff *skb); extern unsigned		inet_addr_type(__be32 addr);extern void		ip_rt_multicast_event(struct in_device *);extern int		ip_rt_ioctl(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->u.dst);} #define IPTOS_RT_MASK	(IPTOS_TOS_MASK & ~3) extern __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,			    .nl_u = { .ip4_u = { .daddr = dst,						 .saddr = src,						 .tos   = tos } },			    .proto = protocol,			    .uli_u = { .ports =				       { .sport = sport,					 .dport = dport } } }; 	int err;	if (!dst || !src) {		err = __ip_route_output_key(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(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;		ip_rt_put(*rp);		*rp = NULL;		security_sk_classify_flow(sk, &fl);		return ip_route_output_flow(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;} extern ctl_table ipv4_route_table[]; #endif	/* _ROUTE_H */