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
50 struct fib_nh;
51 struct inet_peer;
52 struct rtable
53 {
54 union
55 {
56 struct dst_entry dst;
57 } u;
58
59 /* Cache lookup keys */
60 struct flowi fl;
61
62 struct in_device *idev;
63
64 int rt_genid;
65 unsigned rt_flags;
66 __u16 rt_type;
67
68 __be32 rt_dst; /* Path destination */
69 __be32 rt_src; /* Path source */
70 int rt_iif;
71
72 /* Info on neighbour */
73 __be32 rt_gateway;
74
75 /* Miscellaneous cached information */
76 __be32 rt_spec_dst; /* RFC1122 specific destination */
77 struct inet_peer *peer; /* long-living peer info */
78 };
79
80 struct ip_rt_acct
81 {
82 __u32 o_bytes;
83 __u32 o_packets;
84 __u32 i_bytes;
85 __u32 i_packets;
86 };
87
88 struct 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
108 extern struct ip_rt_acct *ip_rt_acct;
109
110 struct in_device;
111 extern int ip_rt_init(void);
112 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
113 __be32 src, struct net_device *dev);
114 extern void rt_cache_flush(struct net *net, int how);
115 extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
116 extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
117 extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
118 extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
119 extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
120 extern void ip_rt_send_redirect(struct sk_buff *skb);
121
122 extern unsigned inet_addr_type(struct net *net, __be32 addr);
123 extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
124 extern void ip_rt_multicast_event(struct in_device *);
125 extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
126 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
127 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
128
129 struct in_ifaddr;
130 extern void fib_add_ifaddr(struct in_ifaddr *);
131
132 static 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
140 extern const __u8 ip_tos2prio[16];
141
142 static inline char rt_tos2priority(u8 tos)
143 {
144 return ip_tos2prio[IPTOS_TOS(tos)>>1];
145 }
146
147 static inline int ip_route_connect(struct rtable **rp, __be32 dst,
148 __be32 src, u32 tos, int oif, u8 protocol,
149 __be16 sport, __be16 dport, struct sock *sk,
150 int flags)
151 {
152 struct flowi fl = { .oif = oif,
153 .mark = sk->sk_mark,
154 .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;
163 struct net *net = sock_net(sk);
164
165 if (inet_sk(sk)->transparent)
166 fl.flags |= FLOWI_FLAG_ANYSRC;
167
168 if (!dst || !src) {
169 err = __ip_route_output_key(net, rp, &fl);
170 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 }
177 security_sk_classify_flow(sk, &fl);
178 return ip_route_output_flow(net, rp, &fl, sk, flags);
179 }
180
181 static inline int ip_route_newports(struct rtable **rp, u8 protocol,
182 __be16 sport, __be16 dport, struct sock *sk)
183 {
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;
191 fl.proto = protocol;
192 ip_rt_put(*rp);
193 *rp = NULL;
194 security_sk_classify_flow(sk, &fl);
195 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
196 }
197 return 0;
198 }
199
200 extern void rt_bind_peer(struct rtable *rt, int create);
201
202 static 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
211 static inline int inet_iif(const struct sk_buff *skb)
212 {
213 return skb_rtable(skb)->rt_iif;
214 }
215
216 #endif /* _ROUTE_H */
217
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