308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/*
|
|
* 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;
|
|
|
|
/* Lookup key. */
|
|
__be32 rt_key_dst;
|
|
__be32 rt_key_src;
|
|
|
|
int rt_genid;
|
|
unsigned rt_flags;
|
|
__u16 rt_type;
|
|
__u8 rt_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 */
|
|
__be32 rt_spec_dst; /* RFC1122 specific destination */
|
|
u32 rt_peer_genid;
|
|
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->rt_route_iif != 0;
|
|
}
|
|
|
|
static inline bool rt_is_output_route(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 *, const 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,
|
|
.daddr = daddr,
|
|
.saddr = saddr,
|
|
.flowi4_tos = tos,
|
|
};
|
|
return ip_route_output_key(net, &fl4);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk,
|
|
__be32 daddr, __be32 saddr,
|
|
__be16 dport, __be16 sport,
|
|
__u8 proto, __u8 tos, int oif)
|
|
{
|
|
struct flowi4 fl4;
|
|
|
|
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,
|
|
__be32 daddr, __be32 saddr,
|
|
__be32 gre_key, __u8 tos, int oif)
|
|
{
|
|
struct flowi4 fl4 = {
|
|
.flowi4_oif = oif,
|
|
.daddr = daddr,
|
|
.saddr = saddr,
|
|
.flowi4_tos = tos,
|
|
.flowi4_proto = IPPROTO_GRE,
|
|
.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 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 *);
|
|
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];
|
|
}
|
|
|
|
static inline struct rtable *ip_route_connect(__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;
|
|
struct flowi4 fl4;
|
|
__u8 flow_flags;
|
|
|
|
flow_flags = 0;
|
|
if (inet_sk(sk)->transparent)
|
|
flow_flags |= FLOWI_FLAG_ANYSRC;
|
|
if (protocol == IPPROTO_TCP)
|
|
flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
|
|
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);
|
|
|
|
if (!dst || !src) {
|
|
rt = __ip_route_output_key(net, &fl4);
|
|
if (IS_ERR(rt))
|
|
return rt;
|
|
fl4.daddr = rt->rt_dst;
|
|
fl4.saddr = rt->rt_src;
|
|
ip_rt_put(rt);
|
|
}
|
|
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 rtable *rt,
|
|
u8 protocol, __be16 orig_sport,
|
|
__be16 orig_dport, __be16 sport,
|
|
__be16 dport, struct sock *sk)
|
|
{
|
|
if (sport != orig_sport || dport != orig_dport) {
|
|
struct flowi4 fl4;
|
|
__u8 flow_flags;
|
|
|
|
flow_flags = 0;
|
|
if (inet_sk(sk)->transparent)
|
|
flow_flags |= FLOWI_FLAG_ANYSRC;
|
|
if (protocol == IPPROTO_TCP)
|
|
flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
|
|
flowi4_init_output(&fl4, rt->rt_oif, rt->rt_mark, rt->rt_tos,
|
|
RT_SCOPE_UNIVERSE, protocol, flow_flags,
|
|
rt->rt_dst, rt->rt_src, dport, sport);
|
|
ip_rt_put(rt);
|
|
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, 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 */
|