1 /*
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.
5 *
6 * Definitions for the IP router.
7 *
8 * Version: @(#)route.h 1.0.4 05/27/93
9 *
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Fixes:
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 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23 #ifndef _ROUTE_H
24 #define _ROUTE_H
25
26 #include <linux/config.h>
27 #include <net/dst.h>
28 #include <net/inetpeer.h>
29 #include <linux/in_route.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/route.h>
32
33 #ifndef __KERNEL__
34 #warning This file is not supposed to be used outside of kernel.
35 #endif
36
37 #define RTO_ONLINK 0x01
38 #define RTO_TPROXY 0x80000000
39
40 #define RTO_CONN 0
41
42 struct rt_key
43 {
44 __u32 dst;
45 __u32 src;
46 int iif;
47 int oif;
48 #ifdef CONFIG_IP_ROUTE_FWMARK
49 __u32 fwmark;
50 #endif
51 __u8 tos;
52 __u8 scope;
53 };
54
55 struct inet_peer;
56 struct rtable
57 {
58 union
59 {
60 struct dst_entry dst;
61 struct rtable *rt_next;
62 } u;
63
64 unsigned rt_flags;
65 unsigned rt_type;
66
67 __u32 rt_dst; /* Path destination */
68 __u32 rt_src; /* Path source */
69 int rt_iif;
70
71 /* Info on neighbour */
72 __u32 rt_gateway;
73
74 /* Cache lookup keys */
75 struct rt_key key;
76
77 /* Miscellaneous cached information */
78 __u32 rt_spec_dst; /* RFC1122 specific destination */
79 struct inet_peer *peer; /* long-living peer info */
80
81 #ifdef CONFIG_IP_ROUTE_NAT
82 __u32 rt_src_map;
83 __u32 rt_dst_map;
84 #endif
85 };
86
87 struct ip_rt_acct
88 {
89 __u32 o_bytes;
90 __u32 o_packets;
91 __u32 i_bytes;
92 __u32 i_packets;
93 };
94
95 extern struct ip_rt_acct *ip_rt_acct;
96
97 struct in_device;
98 extern void ip_rt_init(void);
99 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
100 u32 src, u8 tos, struct net_device *dev);
101 extern void ip_rt_advice(struct rtable **rp, int advice);
102 extern void rt_cache_flush(int how);
103 extern int ip_route_output_key(struct rtable **, const struct rt_key *key);
104 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
105 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
106 extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu);
107 extern void ip_rt_send_redirect(struct sk_buff *skb);
108
109 extern unsigned inet_addr_type(u32 addr);
110 extern void ip_rt_multicast_event(struct in_device *);
111 extern int ip_rt_ioctl(unsigned int cmd, void *arg);
112 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
113 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
114
115 /* Deprecated: use ip_route_output_key directly */
116 static inline int ip_route_output(struct rtable **rp,
117 u32 daddr, u32 saddr, u32 tos, int oif)
118 {
119 struct rt_key key = { dst:daddr, src:saddr, oif:oif, tos:tos };
120
121 return ip_route_output_key(rp, &key);
122 }
123
124
125 static inline void ip_rt_put(struct rtable * rt)
126 {
127 if (rt)
128 dst_release(&rt->u.dst);
129 }
130
131 #ifdef CONFIG_INET_ECN
132 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
133 #else
134 #define IPTOS_RT_MASK IPTOS_TOS_MASK
135 #endif
136
137
138 extern __u8 ip_tos2prio[16];
139
140 static inline char rt_tos2priority(u8 tos)
141 {
142 return ip_tos2prio[IPTOS_TOS(tos)>>1];
143 }
144
145 static inline int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif)
146 {
147 int err;
148 err = ip_route_output(rp, dst, src, tos, oif);
149 if (err || (dst && src))
150 return err;
151 dst = (*rp)->rt_dst;
152 src = (*rp)->rt_src;
153 ip_rt_put(*rp);
154 *rp = NULL;
155 return ip_route_output(rp, dst, src, tos, oif);
156 }
157
158 extern void rt_bind_peer(struct rtable *rt, int create);
159
160 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
161 {
162 if (rt->peer)
163 return rt->peer;
164
165 rt_bind_peer(rt, 0);
166 return rt->peer;
167 }
168
169 #endif /* _ROUTE_H */
170
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