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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/dst.h>
28#include <net/inetpeer.h>
29#include <net/flow.h>
KOVACS Krisztian79876872008-10-01 07:35:39 -070030#include <net/inet_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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>
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -070036#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#ifndef __KERNEL__
39#warning This file is not supposed to be used outside of kernel.
40#endif
41
42#define RTO_ONLINK 0x01
43
44#define RTO_CONN 0
45/* RTO_CONN is not used (being alias for 0), but preserved not to break
46 * some modules referring to it. */
47
48#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
49
50struct fib_nh;
51struct inet_peer;
52struct rtable
53{
54 union
55 {
56 struct dst_entry dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 } u;
58
Eric Dumazet093c2ca2007-02-09 16:19:26 -080059 /* Cache lookup keys */
60 struct flowi fl;
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 struct in_device *idev;
63
Eric Dumazet29e75252008-01-31 17:05:09 -080064 int rt_genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 unsigned rt_flags;
66 __u16 rt_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Al Virof2c3fe22006-09-26 21:26:42 -070068 __be32 rt_dst; /* Path destination */
69 __be32 rt_src; /* Path source */
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 int rt_iif;
71
72 /* Info on neighbour */
Al Virof2c3fe22006-09-26 21:26:42 -070073 __be32 rt_gateway;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 /* Miscellaneous cached information */
Al Virof2c3fe22006-09-26 21:26:42 -070076 __be32 rt_spec_dst; /* RFC1122 specific destination */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108extern struct ip_rt_acct *ip_rt_acct;
109
110struct in_device;
111extern int ip_rt_init(void);
Al Virof7655222006-09-26 21:25:43 -0700112extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
113 __be32 src, struct net_device *dev);
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -0700114extern void rt_cache_flush(struct net *net, int how);
Denis V. Lunev611c1832008-01-22 22:06:48 -0800115extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
Denis V. Lunevf2063512008-01-22 22:07:34 -0800116extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
Denis V. Lunevf1b050b2008-01-22 22:07:10 -0800117extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
Al Viro9e12bb22006-09-26 21:25:20 -0700118extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
Timo Teras0010e462008-04-29 03:32:25 -0700119extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120extern void ip_rt_send_redirect(struct sk_buff *skb);
121
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800122extern unsigned inet_addr_type(struct net *net, __be32 addr);
123extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124extern void ip_rt_multicast_event(struct in_device *);
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800125extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126extern void ip_rt_get_source(u8 *src, struct rtable *rt);
127extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
128
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800129struct in_ifaddr;
130extern void fib_add_ifaddr(struct in_ifaddr *);
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132static inline void ip_rt_put(struct rtable * rt)
133{
134 if (rt)
135 dst_release(&rt->u.dst);
136}
137
138#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
139
Philippe De Muyter4839c522007-07-09 15:32:57 -0700140extern const __u8 ip_tos2prio[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142static inline char rt_tos2priority(u8 tos)
143{
144 return ip_tos2prio[IPTOS_TOS(tos)>>1];
145}
146
Al Virobada8ad2006-09-26 21:27:15 -0700147static inline int ip_route_connect(struct rtable **rp, __be32 dst,
148 __be32 src, u32 tos, int oif, u8 protocol,
David S. Miller8eb90862007-02-08 02:09:21 -0800149 __be16 sport, __be16 dport, struct sock *sk,
150 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
152 struct flowi fl = { .oif = oif,
Laszlo Attila Toth4a19ec52008-01-30 19:08:16 -0800153 .mark = sk->sk_mark,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 .nl_u = { .ip4_u = { .daddr = dst,
155 .saddr = src,
156 .tos = tos } },
157 .proto = protocol,
158 .uli_u = { .ports =
159 { .sport = sport,
160 .dport = dport } } };
161
162 int err;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900163 struct net *net = sock_net(sk);
KOVACS Krisztian79876872008-10-01 07:35:39 -0700164
165 if (inet_sk(sk)->transparent)
166 fl.flags |= FLOWI_FLAG_ANYSRC;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (!dst || !src) {
Denis V. Luneveee80592008-01-22 23:49:35 -0800169 err = __ip_route_output_key(net, rp, &fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (err)
171 return err;
172 fl.fl4_dst = (*rp)->rt_dst;
173 fl.fl4_src = (*rp)->rt_src;
174 ip_rt_put(*rp);
175 *rp = NULL;
176 }
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700177 security_sk_classify_flow(sk, &fl);
Denis V. Luneveee80592008-01-22 23:49:35 -0800178 return ip_route_output_flow(net, rp, &fl, sk, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
Patrick McHardy5d39a792006-01-31 17:35:35 -0800181static inline int ip_route_newports(struct rtable **rp, u8 protocol,
Al Viro39dccd92006-09-27 18:34:41 -0700182 __be16 sport, __be16 dport, struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
184 if (sport != (*rp)->fl.fl_ip_sport ||
185 dport != (*rp)->fl.fl_ip_dport) {
186 struct flowi fl;
187
188 memcpy(&fl, &(*rp)->fl, sizeof(fl));
189 fl.fl_ip_sport = sport;
190 fl.fl_ip_dport = dport;
Patrick McHardy5d39a792006-01-31 17:35:35 -0800191 fl.proto = protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 ip_rt_put(*rp);
193 *rp = NULL;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700194 security_sk_classify_flow(sk, &fl);
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900195 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 }
197 return 0;
198}
199
200extern void rt_bind_peer(struct rtable *rt, int create);
201
202static inline struct inet_peer *rt_get_peer(struct rtable *rt)
203{
204 if (rt->peer)
205 return rt->peer;
206
207 rt_bind_peer(rt, 0);
208 return rt->peer;
209}
210
KOVACS Krisztian1668e012008-10-01 07:33:10 -0700211static inline int inet_iif(const struct sk_buff *skb)
212{
213 return skb->rtable->rt_iif;
214}
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216#endif /* _ROUTE_H */