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net: use the macros defined for the members of flowi
[net-next-2.6.git] / include / net / route.h
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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
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 <net/dst.h>
28#include <net/inetpeer.h>
29#include <net/flow.h>
30#include <net/inet_sock.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#include <linux/security.h>
37
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 struct dst_entry dst;
54
55 /* Cache lookup keys */
56 struct flowi fl;
57
58 int rt_genid;
59 unsigned rt_flags;
60 __u16 rt_type;
61
62 __be32 rt_dst; /* Path destination */
63 __be32 rt_src; /* Path source */
64 int rt_iif;
65
66 /* Info on neighbour */
67 __be32 rt_gateway;
68
69 /* Miscellaneous cached information */
70 __be32 rt_spec_dst; /* RFC1122 specific destination */
71 struct inet_peer *peer; /* long-living peer info */
72};
73
74static inline bool rt_is_input_route(struct rtable *rt)
75{
76 return rt->fl.iif != 0;
77}
78
79static inline bool rt_is_output_route(struct rtable *rt)
80{
81 return rt->fl.iif == 0;
82}
83
84struct ip_rt_acct {
85 __u32 o_bytes;
86 __u32 o_packets;
87 __u32 i_bytes;
88 __u32 i_packets;
89};
90
91struct rt_cache_stat {
92 unsigned int in_hit;
93 unsigned int in_slow_tot;
94 unsigned int in_slow_mc;
95 unsigned int in_no_route;
96 unsigned int in_brd;
97 unsigned int in_martian_dst;
98 unsigned int in_martian_src;
99 unsigned int out_hit;
100 unsigned int out_slow_tot;
101 unsigned int out_slow_mc;
102 unsigned int gc_total;
103 unsigned int gc_ignored;
104 unsigned int gc_goal_miss;
105 unsigned int gc_dst_overflow;
106 unsigned int in_hlist_search;
107 unsigned int out_hlist_search;
108};
109
110extern struct ip_rt_acct __percpu *ip_rt_acct;
111
112struct in_device;
113extern int ip_rt_init(void);
114extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
115 __be32 src, struct net_device *dev);
116extern void rt_cache_flush(struct net *net, int how);
117extern void rt_cache_flush_batch(void);
118extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
119extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
120extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
121
122extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
123 u8 tos, struct net_device *devin, bool noref);
124
125static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
126 u8 tos, struct net_device *devin)
127{
128 return ip_route_input_common(skb, dst, src, tos, devin, false);
129}
130
131static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
132 u8 tos, struct net_device *devin)
133{
134 return ip_route_input_common(skb, dst, src, tos, devin, true);
135}
136
137extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
138extern void ip_rt_send_redirect(struct sk_buff *skb);
139
140extern unsigned inet_addr_type(struct net *net, __be32 addr);
141extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
142extern void ip_rt_multicast_event(struct in_device *);
143extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
144extern void ip_rt_get_source(u8 *src, struct rtable *rt);
145extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
146
147struct in_ifaddr;
148extern void fib_add_ifaddr(struct in_ifaddr *);
149
150static inline void ip_rt_put(struct rtable * rt)
151{
152 if (rt)
153 dst_release(&rt->dst);
154}
155
156#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
157
158extern const __u8 ip_tos2prio[16];
159
160static inline char rt_tos2priority(u8 tos)
161{
162 return ip_tos2prio[IPTOS_TOS(tos)>>1];
163}
164
165static inline int ip_route_connect(struct rtable **rp, __be32 dst,
166 __be32 src, u32 tos, int oif, u8 protocol,
167 __be16 sport, __be16 dport, struct sock *sk,
168 int flags)
169{
170 struct flowi fl = { .oif = oif,
171 .mark = sk->sk_mark,
172 .fl4_dst = dst,
173 .fl4_src = src,
174 .fl4_tos = tos,
175 .proto = protocol,
176 .fl_ip_sport = sport,
177 .fl_ip_dport = dport };
178 int err;
179 struct net *net = sock_net(sk);
180
181 if (inet_sk(sk)->transparent)
182 fl.flags |= FLOWI_FLAG_ANYSRC;
183
184 if (!dst || !src) {
185 err = __ip_route_output_key(net, rp, &fl);
186 if (err)
187 return err;
188 fl.fl4_dst = (*rp)->rt_dst;
189 fl.fl4_src = (*rp)->rt_src;
190 ip_rt_put(*rp);
191 *rp = NULL;
192 }
193 security_sk_classify_flow(sk, &fl);
194 return ip_route_output_flow(net, rp, &fl, sk, flags);
195}
196
197static inline int ip_route_newports(struct rtable **rp, u8 protocol,
198 __be16 sport, __be16 dport, struct sock *sk)
199{
200 if (sport != (*rp)->fl.fl_ip_sport ||
201 dport != (*rp)->fl.fl_ip_dport) {
202 struct flowi fl;
203
204 memcpy(&fl, &(*rp)->fl, sizeof(fl));
205 fl.fl_ip_sport = sport;
206 fl.fl_ip_dport = dport;
207 fl.proto = protocol;
208 if (inet_sk(sk)->transparent)
209 fl.flags |= FLOWI_FLAG_ANYSRC;
210 ip_rt_put(*rp);
211 *rp = NULL;
212 security_sk_classify_flow(sk, &fl);
213 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
214 }
215 return 0;
216}
217
218extern void rt_bind_peer(struct rtable *rt, int create);
219
220static inline struct inet_peer *rt_get_peer(struct rtable *rt)
221{
222 if (rt->peer)
223 return rt->peer;
224
225 rt_bind_peer(rt, 0);
226 return rt->peer;
227}
228
229static inline int inet_iif(const struct sk_buff *skb)
230{
231 return skb_rtable(skb)->rt_iif;
232}
233
234#endif /* _ROUTE_H */
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