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.
6 * Definitions for the IP router.
8 * Version: @(#)route.h 1.0.4 05/27/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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
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.
28 #include <net/inetpeer.h>
30 #include <net/inet_sock.h>
31 #include <linux/in_route.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/route.h>
35 #include <linux/cache.h>
36 #include <linux/security.h>
39 #warning This file is not supposed to be used outside of kernel.
42 #define RTO_ONLINK 0x01
45 /* RTO_CONN is not used (being alias for 0), but preserved not to break
46 * some modules referring to it. */
48 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
65 __be32 rt_dst
; /* Path destination */
66 __be32 rt_src
; /* Path source */
72 /* Info on neighbour */
75 /* Miscellaneous cached information */
76 __be32 rt_spec_dst
; /* RFC1122 specific destination */
78 struct inet_peer
*peer
; /* long-living peer info */
79 struct fib_info
*fi
; /* for client ref to shared metrics */
82 static inline bool rt_is_input_route(struct rtable
*rt
)
84 return rt
->rt_route_iif
!= 0;
87 static inline bool rt_is_output_route(struct rtable
*rt
)
89 return rt
->rt_route_iif
== 0;
99 struct rt_cache_stat
{
101 unsigned int in_slow_tot
;
102 unsigned int in_slow_mc
;
103 unsigned int in_no_route
;
105 unsigned int in_martian_dst
;
106 unsigned int in_martian_src
;
107 unsigned int out_hit
;
108 unsigned int out_slow_tot
;
109 unsigned int out_slow_mc
;
110 unsigned int gc_total
;
111 unsigned int gc_ignored
;
112 unsigned int gc_goal_miss
;
113 unsigned int gc_dst_overflow
;
114 unsigned int in_hlist_search
;
115 unsigned int out_hlist_search
;
118 extern struct ip_rt_acct __percpu
*ip_rt_acct
;
121 extern int ip_rt_init(void);
122 extern void ip_rt_redirect(__be32 old_gw
, __be32 dst
, __be32 new_gw
,
123 __be32 src
, struct net_device
*dev
);
124 extern void rt_cache_flush(struct net
*net
, int how
);
125 extern void rt_cache_flush_batch(struct net
*net
);
126 extern struct rtable
*__ip_route_output_key(struct net
*, const struct flowi4
*flp
);
127 extern struct rtable
*ip_route_output_flow(struct net
*, struct flowi4
*flp
,
129 extern struct dst_entry
*ipv4_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
);
131 static inline struct rtable
*ip_route_output_key(struct net
*net
, struct flowi4
*flp
)
133 return ip_route_output_flow(net
, flp
, NULL
);
136 static inline struct rtable
*ip_route_output(struct net
*net
, __be32 daddr
,
137 __be32 saddr
, u8 tos
, int oif
)
139 struct flowi4 fl4
= {
145 return ip_route_output_key(net
, &fl4
);
148 static inline struct rtable
*ip_route_output_ports(struct net
*net
, struct sock
*sk
,
149 __be32 daddr
, __be32 saddr
,
150 __be16 dport
, __be16 sport
,
151 __u8 proto
, __u8 tos
, int oif
)
155 flowi4_init_output(&fl4
, oif
, sk
? sk
->sk_mark
: 0, tos
,
156 RT_SCOPE_UNIVERSE
, proto
,
157 sk
? inet_sk_flowi_flags(sk
) : 0,
158 daddr
, saddr
, dport
, sport
);
160 security_sk_classify_flow(sk
, flowi4_to_flowi(&fl4
));
161 return ip_route_output_flow(net
, &fl4
, sk
);
164 static inline struct rtable
*ip_route_output_gre(struct net
*net
,
165 __be32 daddr
, __be32 saddr
,
166 __be32 gre_key
, __u8 tos
, int oif
)
168 struct flowi4 fl4
= {
173 .flowi4_proto
= IPPROTO_GRE
,
174 .fl4_gre_key
= gre_key
,
176 return ip_route_output_key(net
, &fl4
);
179 extern int ip_route_input_common(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
180 u8 tos
, struct net_device
*devin
, bool noref
);
182 static inline int ip_route_input(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
183 u8 tos
, struct net_device
*devin
)
185 return ip_route_input_common(skb
, dst
, src
, tos
, devin
, false);
188 static inline int ip_route_input_noref(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
189 u8 tos
, struct net_device
*devin
)
191 return ip_route_input_common(skb
, dst
, src
, tos
, devin
, true);
194 extern unsigned short ip_rt_frag_needed(struct net
*net
, struct iphdr
*iph
, unsigned short new_mtu
, struct net_device
*dev
);
195 extern void ip_rt_send_redirect(struct sk_buff
*skb
);
197 extern unsigned inet_addr_type(struct net
*net
, __be32 addr
);
198 extern unsigned inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
, __be32 addr
);
199 extern void ip_rt_multicast_event(struct in_device
*);
200 extern int ip_rt_ioctl(struct net
*, unsigned int cmd
, void __user
*arg
);
201 extern void ip_rt_get_source(u8
*src
, struct rtable
*rt
);
202 extern int ip_rt_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
);
205 extern void fib_add_ifaddr(struct in_ifaddr
*);
206 extern void fib_del_ifaddr(struct in_ifaddr
*, struct in_ifaddr
*);
208 static inline void ip_rt_put(struct rtable
* rt
)
211 dst_release(&rt
->dst
);
214 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
216 extern const __u8 ip_tos2prio
[16];
218 static inline char rt_tos2priority(u8 tos
)
220 return ip_tos2prio
[IPTOS_TOS(tos
)>>1];
223 static inline struct rtable
*ip_route_connect(__be32 dst
, __be32 src
, u32 tos
,
224 int oif
, u8 protocol
,
225 __be16 sport
, __be16 dport
,
226 struct sock
*sk
, bool can_sleep
)
228 struct net
*net
= sock_net(sk
);
234 if (inet_sk(sk
)->transparent
)
235 flow_flags
|= FLOWI_FLAG_ANYSRC
;
236 if (protocol
== IPPROTO_TCP
)
237 flow_flags
|= FLOWI_FLAG_PRECOW_METRICS
;
239 flow_flags
|= FLOWI_FLAG_CAN_SLEEP
;
241 flowi4_init_output(&fl4
, oif
, sk
->sk_mark
, tos
, RT_SCOPE_UNIVERSE
,
242 protocol
, flow_flags
, dst
, src
, dport
, sport
);
245 rt
= __ip_route_output_key(net
, &fl4
);
248 fl4
.daddr
= rt
->rt_dst
;
249 fl4
.saddr
= rt
->rt_src
;
252 security_sk_classify_flow(sk
, flowi4_to_flowi(&fl4
));
253 return ip_route_output_flow(net
, &fl4
, sk
);
256 static inline struct rtable
*ip_route_newports(struct rtable
*rt
,
257 u8 protocol
, __be16 orig_sport
,
258 __be16 orig_dport
, __be16 sport
,
259 __be16 dport
, struct sock
*sk
)
261 if (sport
!= orig_sport
|| dport
!= orig_dport
) {
266 if (inet_sk(sk
)->transparent
)
267 flow_flags
|= FLOWI_FLAG_ANYSRC
;
268 if (protocol
== IPPROTO_TCP
)
269 flow_flags
|= FLOWI_FLAG_PRECOW_METRICS
;
270 flowi4_init_output(&fl4
, rt
->rt_oif
, rt
->rt_mark
, rt
->rt_tos
,
271 RT_SCOPE_UNIVERSE
, protocol
, flow_flags
,
272 rt
->rt_dst
, rt
->rt_src
, dport
, sport
);
274 security_sk_classify_flow(sk
, flowi4_to_flowi(&fl4
));
275 return ip_route_output_flow(sock_net(sk
), &fl4
, sk
);
280 extern void rt_bind_peer(struct rtable
*rt
, int create
);
282 static inline struct inet_peer
*rt_get_peer(struct rtable
*rt
)
291 static inline int inet_iif(const struct sk_buff
*skb
)
293 return skb_rtable(skb
)->rt_iif
;
296 extern int sysctl_ip_default_ttl
;
298 static inline int ip4_dst_hoplimit(const struct dst_entry
*dst
)
300 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
303 hoplimit
= sysctl_ip_default_ttl
;
307 #endif /* _ROUTE_H */