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
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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.
27 #include <linux/config.h>
29 #include <net/inetpeer.h>
31 #include <linux/in_route.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/route.h>
35 #include <linux/cache.h>
38 #warning This file is not supposed to be used outside of kernel.
41 #define RTO_ONLINK 0x01
44 /* RTO_CONN is not used (being alias for 0), but preserved not to break
45 * some modules referring to it. */
47 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sk->sk_localroute)
55 struct rtable
*rt_next
;
58 struct in_device
*idev
;
63 __u32 rt_dst
; /* Path destination */
64 __u32 rt_src
; /* Path source */
67 /* Info on neighbour */
70 /* Cache lookup keys */
73 /* Miscellaneous cached information */
74 __u32 rt_spec_dst
; /* RFC1122 specific destination */
75 struct inet_peer
*peer
; /* long-living peer info */
77 #ifdef CONFIG_IP_ROUTE_NAT
94 unsigned int in_slow_tot
;
95 unsigned int in_slow_mc
;
96 unsigned int in_no_route
;
98 unsigned int in_martian_dst
;
99 unsigned int in_martian_src
;
100 unsigned int out_hit
;
101 unsigned int out_slow_tot
;
102 unsigned int out_slow_mc
;
103 unsigned int gc_total
;
104 unsigned int gc_ignored
;
105 unsigned int gc_goal_miss
;
106 unsigned int gc_dst_overflow
;
107 unsigned int in_hlist_search
;
108 unsigned int out_hlist_search
;
111 extern struct rt_cache_stat
*rt_cache_stat
;
112 #define RT_CACHE_STAT_INC(field) \
113 (per_cpu_ptr(rt_cache_stat, smp_processor_id())->field++)
115 extern struct ip_rt_acct
*ip_rt_acct
;
118 extern int ip_rt_init(void);
119 extern void ip_rt_redirect(u32 old_gw
, u32 dst
, u32 new_gw
,
120 u32 src
, u8 tos
, struct net_device
*dev
);
121 extern void ip_rt_advice(struct rtable
**rp
, int advice
);
122 extern void rt_cache_flush(int how
);
123 extern int __ip_route_output_key(struct rtable
**, const struct flowi
*flp
);
124 extern int ip_route_output_key(struct rtable
**, struct flowi
*flp
);
125 extern int ip_route_output_flow(struct rtable
**rp
, struct flowi
*flp
, struct sock
*sk
, int flags
);
126 extern int ip_route_input(struct sk_buff
*, u32 dst
, u32 src
, u8 tos
, struct net_device
*devin
);
127 extern unsigned short ip_rt_frag_needed(struct iphdr
*iph
, unsigned short new_mtu
);
128 extern void ip_rt_send_redirect(struct sk_buff
*skb
);
130 extern unsigned inet_addr_type(u32 addr
);
131 extern void ip_rt_multicast_event(struct in_device
*);
132 extern int ip_rt_ioctl(unsigned int cmd
, void __user
*arg
);
133 extern void ip_rt_get_source(u8
*src
, struct rtable
*rt
);
134 extern int ip_rt_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
);
136 static inline void ip_rt_put(struct rtable
* rt
)
139 dst_release(&rt
->u
.dst
);
142 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
144 extern __u8 ip_tos2prio
[16];
146 static inline char rt_tos2priority(u8 tos
)
148 return ip_tos2prio
[IPTOS_TOS(tos
)>>1];
151 static inline int ip_route_connect(struct rtable
**rp
, u32 dst
,
152 u32 src
, u32 tos
, int oif
, u8 protocol
,
153 u16 sport
, u16 dport
, struct sock
*sk
)
155 struct flowi fl
= { .oif
= oif
,
156 .nl_u
= { .ip4_u
= { .daddr
= dst
,
162 .dport
= dport
} } };
166 err
= __ip_route_output_key(rp
, &fl
);
169 fl
.fl4_dst
= (*rp
)->rt_dst
;
170 fl
.fl4_src
= (*rp
)->rt_src
;
174 return ip_route_output_flow(rp
, &fl
, sk
, 0);
177 static inline int ip_route_newports(struct rtable
**rp
, u16 sport
, u16 dport
,
180 if (sport
!= (*rp
)->fl
.fl_ip_sport
||
181 dport
!= (*rp
)->fl
.fl_ip_dport
) {
184 memcpy(&fl
, &(*rp
)->fl
, sizeof(fl
));
185 fl
.fl_ip_sport
= sport
;
186 fl
.fl_ip_dport
= dport
;
189 return ip_route_output_flow(rp
, &fl
, sk
, 0);
194 extern void rt_bind_peer(struct rtable
*rt
, int create
);
196 static inline struct inet_peer
*rt_get_peer(struct rtable
*rt
)
205 #endif /* _ROUTE_H */