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/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 #include <net/sock.h>
38
39 #ifndef __KERNEL__
40 #warning This file is not supposed to be used outside of kernel.
41 #endif
42
43 #define RTO_ONLINK 0x01
44
45 #define RTO_CONN 0
46 /* RTO_CONN is not used (being alias for 0), but preserved not to break
47 * some modules referring to it. */
48
49 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
50
51 struct fib_nh;
52 struct inet_peer;
53 struct rtable
54 {
55 union
56 {
57 struct dst_entry dst;
58 } u;
59
60 /* Cache lookup keys */
61 struct flowi fl;
62
63 struct in_device *idev;
64
65 int rt_genid;
66 unsigned rt_flags;
67 __u16 rt_type;
68
69 __be32 rt_dst; /* Path destination */
70 __be32 rt_src; /* Path source */
71 int rt_iif;
72
73 /* Info on neighbour */
74 __be32 rt_gateway;
75
76 /* Miscellaneous cached information */
77 __be32 rt_spec_dst; /* RFC1122 specific destination */
78 struct inet_peer *peer; /* long-living peer info */
79 };
80
81 struct ip_rt_acct
82 {
83 __u32 o_bytes;
84 __u32 o_packets;
85 __u32 i_bytes;
86 __u32 i_packets;
87 };
88
89 struct rt_cache_stat
90 {
91 unsigned int in_hit;
92 unsigned int in_slow_tot;
93 unsigned int in_slow_mc;
94 unsigned int in_no_route;
95 unsigned int in_brd;
96 unsigned int in_martian_dst;
97 unsigned int in_martian_src;
98 unsigned int out_hit;
99 unsigned int out_slow_tot;
100 unsigned int out_slow_mc;
101 unsigned int gc_total;
102 unsigned int gc_ignored;
103 unsigned int gc_goal_miss;
104 unsigned int gc_dst_overflow;
105 unsigned int in_hlist_search;
106 unsigned int out_hlist_search;
107 };
108
109 extern struct ip_rt_acct *ip_rt_acct;
110
111 struct in_device;
112 extern int ip_rt_init(void);
113 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
114 __be32 src, struct net_device *dev);
115 extern void rt_cache_flush(int how);
116 extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
117 extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
118 extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
119 extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
120 extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu);
121 extern void ip_rt_send_redirect(struct sk_buff *skb);
122
123 extern unsigned inet_addr_type(struct net *net, __be32 addr);
124 extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
125 extern void ip_rt_multicast_event(struct in_device *);
126 extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
127 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
128 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
129
130 struct in_ifaddr;
131 extern void fib_add_ifaddr(struct in_ifaddr *);
132
133 static 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
141 extern const __u8 ip_tos2prio[16];
142
143 static inline char rt_tos2priority(u8 tos)
144 {
145 return ip_tos2prio[IPTOS_TOS(tos)>>1];
146 }
147
148 static inline int ip_route_connect(struct rtable **rp, __be32 dst,
149 __be32 src, u32 tos, int oif, u8 protocol,
150 __be16 sport, __be16 dport, struct sock *sk,
151 int flags)
152 {
153 struct flowi fl = { .oif = oif,
154 .mark = sk->sk_mark,
155 .nl_u = { .ip4_u = { .daddr = dst,
156 .saddr = src,
157 .tos = tos } },
158 .proto = protocol,
159 .uli_u = { .ports =
160 { .sport = sport,
161 .dport = dport } } };
162
163 int err;
164 struct net *net = sk->sk_net;
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
178 static 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(sk->sk_net, rp, &fl, sk, 0);
193 }
194 return 0;
195 }
196
197 extern void rt_bind_peer(struct rtable *rt, int create);
198
199 static 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
208 extern ctl_table ipv4_route_table[];
209
210 #endif /* _ROUTE_H */
211
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