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Linux kernel mirror (for testing)
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linux
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 union {
54 struct dst_entry dst;
55 } u;
56
57 /* Cache lookup keys */
58 struct flowi fl;
59
60 struct in_device *idev;
61
62 int rt_genid;
63 unsigned rt_flags;
64 __u16 rt_type;
65
66 __be32 rt_dst; /* Path destination */
67 __be32 rt_src; /* Path source */
68 int rt_iif;
69
70 /* Info on neighbour */
71 __be32 rt_gateway;
72
73 /* Miscellaneous cached information */
74 __be32 rt_spec_dst; /* RFC1122 specific destination */
75 struct inet_peer *peer; /* long-living peer info */
76};
77
78struct ip_rt_acct {
79 __u32 o_bytes;
80 __u32 o_packets;
81 __u32 i_bytes;
82 __u32 i_packets;
83};
84
85struct rt_cache_stat {
86 unsigned int in_hit;
87 unsigned int in_slow_tot;
88 unsigned int in_slow_mc;
89 unsigned int in_no_route;
90 unsigned int in_brd;
91 unsigned int in_martian_dst;
92 unsigned int in_martian_src;
93 unsigned int out_hit;
94 unsigned int out_slow_tot;
95 unsigned int out_slow_mc;
96 unsigned int gc_total;
97 unsigned int gc_ignored;
98 unsigned int gc_goal_miss;
99 unsigned int gc_dst_overflow;
100 unsigned int in_hlist_search;
101 unsigned int out_hlist_search;
102};
103
104extern struct ip_rt_acct *ip_rt_acct;
105
106struct in_device;
107extern int ip_rt_init(void);
108extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
109 __be32 src, struct net_device *dev);
110extern void rt_cache_flush(struct net *net, int how);
111extern void rt_cache_flush_batch(void);
112extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
113extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
114extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
115extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
116extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
117extern void ip_rt_send_redirect(struct sk_buff *skb);
118
119extern unsigned inet_addr_type(struct net *net, __be32 addr);
120extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
121extern void ip_rt_multicast_event(struct in_device *);
122extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
123extern void ip_rt_get_source(u8 *src, struct rtable *rt);
124extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
125
126struct in_ifaddr;
127extern void fib_add_ifaddr(struct in_ifaddr *);
128
129static inline void ip_rt_put(struct rtable * rt)
130{
131 if (rt)
132 dst_release(&rt->u.dst);
133}
134
135#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
136
137extern const __u8 ip_tos2prio[16];
138
139static inline char rt_tos2priority(u8 tos)
140{
141 return ip_tos2prio[IPTOS_TOS(tos)>>1];
142}
143
144static inline int ip_route_connect(struct rtable **rp, __be32 dst,
145 __be32 src, u32 tos, int oif, u8 protocol,
146 __be16 sport, __be16 dport, struct sock *sk,
147 int flags)
148{
149 struct flowi fl = { .oif = oif,
150 .mark = sk->sk_mark,
151 .nl_u = { .ip4_u = { .daddr = dst,
152 .saddr = src,
153 .tos = tos } },
154 .proto = protocol,
155 .uli_u = { .ports =
156 { .sport = sport,
157 .dport = dport } } };
158
159 int err;
160 struct net *net = sock_net(sk);
161
162 if (inet_sk(sk)->transparent)
163 fl.flags |= FLOWI_FLAG_ANYSRC;
164
165 if (!dst || !src) {
166 err = __ip_route_output_key(net, rp, &fl);
167 if (err)
168 return err;
169 fl.fl4_dst = (*rp)->rt_dst;
170 fl.fl4_src = (*rp)->rt_src;
171 ip_rt_put(*rp);
172 *rp = NULL;
173 }
174 security_sk_classify_flow(sk, &fl);
175 return ip_route_output_flow(net, rp, &fl, sk, flags);
176}
177
178static inline int ip_route_newports(struct rtable **rp, u8 protocol,
179 __be16 sport, __be16 dport, struct sock *sk)
180{
181 if (sport != (*rp)->fl.fl_ip_sport ||
182 dport != (*rp)->fl.fl_ip_dport) {
183 struct flowi fl;
184
185 memcpy(&fl, &(*rp)->fl, sizeof(fl));
186 fl.fl_ip_sport = sport;
187 fl.fl_ip_dport = dport;
188 fl.proto = protocol;
189 ip_rt_put(*rp);
190 *rp = NULL;
191 security_sk_classify_flow(sk, &fl);
192 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
193 }
194 return 0;
195}
196
197extern void rt_bind_peer(struct rtable *rt, int create);
198
199static inline struct inet_peer *rt_get_peer(struct rtable *rt)
200{
201 if (rt->peer)
202 return rt->peer;
203
204 rt_bind_peer(rt, 0);
205 return rt->peer;
206}
207
208static inline int inet_iif(const struct sk_buff *skb)
209{
210 return skb_rtable(skb)->rt_iif;
211}
212
213#endif /* _ROUTE_H */