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[net-next-2.6.git] / include / net / route.h
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LT		 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 * Robert Olsson : Added rt_cache statistics
18 *
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.
23 */
24#ifndef _ROUTE_H
25#define _ROUTE_H
26
27#include <linux/config.h>
28#include <net/dst.h>
29#include <net/inetpeer.h>
30#include <net/flow.h>
31#include <linux/in_route.h>
32#include <linux/rtnetlink.h>
33#include <linux/route.h>
34#include <linux/ip.h>
35#include <linux/cache.h>
36
37#ifndef __KERNEL__
38#warning This file is not supposed to be used outside of kernel.
39#endif
40
41#define RTO_ONLINK 0x01
42
43#define RTO_CONN 0
44/* RTO_CONN is not used (being alias for 0), but preserved not to break
45 * some modules referring to it. */
46
47#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
48
49struct fib_nh;
50struct inet_peer;
51struct rtable
52{
53 union
54 {
55 struct dst_entry dst;
56 struct rtable *rt_next;
57 } u;
58
59 struct in_device *idev;
60
61 unsigned rt_flags;
62 __u16 rt_type;
63 __u16 rt_multipath_alg;
64
65 __u32 rt_dst; /* Path destination */
66 __u32 rt_src; /* Path source */
67 int rt_iif;
68
69 /* Info on neighbour */
70 __u32 rt_gateway;
71
72 /* Cache lookup keys */
73 struct flowi fl;
74
75 /* Miscellaneous cached information */
76 __u32 rt_spec_dst; /* RFC1122 specific destination */
77 struct inet_peer *peer; /* long-living peer info */
78};
79
80struct ip_rt_acct
81{
82 __u32 o_bytes;
83 __u32 o_packets;
84 __u32 i_bytes;
85 __u32 i_packets;
86};
87
88struct rt_cache_stat
89{
90 unsigned int in_hit;
91 unsigned int in_slow_tot;
92 unsigned int in_slow_mc;
93 unsigned int in_no_route;
94 unsigned int in_brd;
95 unsigned int in_martian_dst;
96 unsigned int in_martian_src;
97 unsigned int out_hit;
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;
106};
107
108extern struct rt_cache_stat *rt_cache_stat;
109#define RT_CACHE_STAT_INC(field) \
110 (per_cpu_ptr(rt_cache_stat, _smp_processor_id())->field++)
111
112extern struct ip_rt_acct *ip_rt_acct;
113
114struct in_device;
115extern int ip_rt_init(void);
116extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
117 u32 src, u8 tos, struct net_device *dev);
118extern void ip_rt_advice(struct rtable **rp, int advice);
119extern void rt_cache_flush(int how);
120extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
121extern int ip_route_output_key(struct rtable **, struct flowi *flp);
122extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
123extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
124extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
125extern void ip_rt_send_redirect(struct sk_buff *skb);
126
127extern unsigned inet_addr_type(u32 addr);
128extern void ip_rt_multicast_event(struct in_device *);
129extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
130extern void ip_rt_get_source(u8 *src, struct rtable *rt);
131extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
132
133static inline void ip_rt_put(struct rtable * rt)
134{
135 if (rt)
136 dst_release(&rt->u.dst);
137}
138
139#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
140
141extern __u8 ip_tos2prio[16];
142
143static inline char rt_tos2priority(u8 tos)
144{
145 return ip_tos2prio[IPTOS_TOS(tos)>>1];
146}
147
148static inline int ip_route_connect(struct rtable **rp, u32 dst,
149 u32 src, u32 tos, int oif, u8 protocol,
150 u16 sport, u16 dport, struct sock *sk)
151{
152 struct flowi fl = { .oif = oif,
153 .nl_u = { .ip4_u = { .daddr = dst,
154 .saddr = src,
155 .tos = tos } },
156 .proto = protocol,
157 .uli_u = { .ports =
158 { .sport = sport,
159 .dport = dport } } };
160
161 int err;
162 if (!dst || !src) {
163 err = __ip_route_output_key(rp, &fl);
164 if (err)
165 return err;
166 fl.fl4_dst = (*rp)->rt_dst;
167 fl.fl4_src = (*rp)->rt_src;
168 ip_rt_put(*rp);
169 *rp = NULL;
170 }
171 return ip_route_output_flow(rp, &fl, sk, 0);
172}
173
174static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
175 struct sock *sk)
176{
177 if (sport != (*rp)->fl.fl_ip_sport ||
178 dport != (*rp)->fl.fl_ip_dport) {
179 struct flowi fl;
180
181 memcpy(&fl, &(*rp)->fl, sizeof(fl));
182 fl.fl_ip_sport = sport;
183 fl.fl_ip_dport = dport;
184#if defined(CONFIG_IP_ROUTE_MULTIPATH_CACHED)
185 fl.flags |= FLOWI_FLAG_MULTIPATHOLDROUTE;
186#endif
187 ip_rt_put(*rp);
188 *rp = NULL;
189 return ip_route_output_flow(rp, &fl, sk, 0);
190 }
191 return 0;
192}
193
194extern void rt_bind_peer(struct rtable *rt, int create);
195
196static inline struct inet_peer *rt_get_peer(struct rtable *rt)
197{
198 if (rt->peer)
199 return rt->peer;
200
201 rt_bind_peer(rt, 0);
202 return rt->peer;
203}
204
205#endif /* _ROUTE_H */
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