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 <linux/in_route.h>
31 #include <linux/rtnetlink.h>
32 #include <linux/route.h>
34 #include <linux/cache.h>
35 #include <linux/security.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) | sock_flag(sk, SOCK_LOCALROUTE))
56 struct rtable
*rt_next
;
59 struct in_device
*idev
;
63 __u16 rt_multipath_alg
;
65 __be32 rt_dst
; /* Path destination */
66 __be32 rt_src
; /* Path source */
69 /* Info on neighbour */
72 /* Cache lookup keys */
75 /* Miscellaneous cached information */
76 __be32 rt_spec_dst
; /* RFC1122 specific destination */
77 struct inet_peer
*peer
; /* long-living peer info */
91 unsigned int in_slow_tot
;
92 unsigned int in_slow_mc
;
93 unsigned int in_no_route
;
95 unsigned int in_martian_dst
;
96 unsigned int in_martian_src
;
98 unsigned int out_slow_tot
;
99 unsigned int out_slow_mc
;
100 unsigned int gc_total
;
101 unsigned int gc_ignored
;
102 unsigned int gc_goal_miss
;
103 unsigned int gc_dst_overflow
;
104 unsigned int in_hlist_search
;
105 unsigned int out_hlist_search
;
108 extern struct ip_rt_acct
*ip_rt_acct
;
111 extern int ip_rt_init(void);
112 extern void ip_rt_redirect(__be32 old_gw
, __be32 dst
, __be32 new_gw
,
113 __be32 src
, struct net_device
*dev
);
114 extern void ip_rt_advice(struct rtable
**rp
, int advice
);
115 extern void rt_cache_flush(int how
);
116 extern int __ip_route_output_key(struct rtable
**, const struct flowi
*flp
);
117 extern int ip_route_output_key(struct rtable
**, struct flowi
*flp
);
118 extern int ip_route_output_flow(struct rtable
**rp
, struct flowi
*flp
, struct sock
*sk
, int flags
);
119 extern int ip_route_input(struct sk_buff
*, __be32 dst
, __be32 src
, u8 tos
, struct net_device
*devin
);
120 extern unsigned short ip_rt_frag_needed(struct iphdr
*iph
, unsigned short new_mtu
);
121 extern void ip_rt_send_redirect(struct sk_buff
*skb
);
123 extern unsigned inet_addr_type(__be32 addr
);
124 extern void ip_rt_multicast_event(struct in_device
*);
125 extern int ip_rt_ioctl(unsigned int cmd
, void __user
*arg
);
126 extern void ip_rt_get_source(u8
*src
, struct rtable
*rt
);
127 extern int ip_rt_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
);
130 extern void fib_add_ifaddr(struct in_ifaddr
*);
132 static inline void ip_rt_put(struct rtable
* rt
)
135 dst_release(&rt
->u
.dst
);
138 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
140 extern __u8 ip_tos2prio
[16];
142 static inline char rt_tos2priority(u8 tos
)
144 return ip_tos2prio
[IPTOS_TOS(tos
)>>1];
147 static inline int ip_route_connect(struct rtable
**rp
, __be32 dst
,
148 __be32 src
, u32 tos
, int oif
, u8 protocol
,
149 __be16 sport
, __be16 dport
, struct sock
*sk
,
152 struct flowi fl
= { .oif
= oif
,
153 .nl_u
= { .ip4_u
= { .daddr
= dst
,
159 .dport
= dport
} } };
163 err
= __ip_route_output_key(rp
, &fl
);
166 fl
.fl4_dst
= (*rp
)->rt_dst
;
167 fl
.fl4_src
= (*rp
)->rt_src
;
171 security_sk_classify_flow(sk
, &fl
);
172 return ip_route_output_flow(rp
, &fl
, sk
, flags
);
175 static inline int ip_route_newports(struct rtable
**rp
, u8 protocol
,
176 __be16 sport
, __be16 dport
, struct sock
*sk
)
178 if (sport
!= (*rp
)->fl
.fl_ip_sport
||
179 dport
!= (*rp
)->fl
.fl_ip_dport
) {
182 memcpy(&fl
, &(*rp
)->fl
, sizeof(fl
));
183 fl
.fl_ip_sport
= sport
;
184 fl
.fl_ip_dport
= dport
;
188 security_sk_classify_flow(sk
, &fl
);
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 extern ctl_table ipv4_route_table
[];
207 #endif /* _ROUTE_H */