/* * 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, 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;} 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 */