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, <bir7@leland.Stanford.Edu>
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 <linux/config.h>
28 #include <net/dst.h>
29 #include <net/inetpeer.h>
30 #include <linux/in_route.h>
31 #include <linux/rtnetlink.h>
32 #include <linux/route.h>
33 #include <linux/ip.h>
34 #include <linux/cache.h>
35
36 #ifndef __KERNEL__
37 #warning This file is not supposed to be used outside of kernel.
38 #endif
39
40 #define RTO_ONLINK 0x01
41
42 #define RTO_CONN 0
43 /* RTO_CONN is not used (being alias for 0), but preserved not to break
44 * some modules referring to it. */
45
46 #define RT_CONN_FLAGS(sk) (RT_TOS(sk->protinfo.af_inet.tos) | sk->localroute)
47
48 struct rt_key
49 {
50 __u32 dst;
51 __u32 src;
52 int iif;
53 int oif;
54 #ifdef CONFIG_IP_ROUTE_FWMARK
55 __u32 fwmark;
56 #endif
57 __u8 tos;
58 __u8 scope;
59 };
60
61 struct inet_peer;
62 struct rtable
63 {
64 union
65 {
66 struct dst_entry dst;
67 struct rtable *rt_next;
68 } u;
69
70 unsigned rt_flags;
71 unsigned rt_type;
72
73 __u32 rt_dst; /* Path destination */
74 __u32 rt_src; /* Path source */
75 int rt_iif;
76
77 /* Info on neighbour */
78 __u32 rt_gateway;
79
80 /* Cache lookup keys */
81 struct rt_key key;
82
83 /* Miscellaneous cached information */
84 __u32 rt_spec_dst; /* RFC1122 specific destination */
85 struct inet_peer *peer; /* long-living peer info */
86
87 #ifdef CONFIG_IP_ROUTE_NAT
88 __u32 rt_src_map;
89 __u32 rt_dst_map;
90 #endif
91 };
92
93 struct ip_rt_acct
94 {
95 __u32 o_bytes;
96 __u32 o_packets;
97 __u32 i_bytes;
98 __u32 i_packets;
99 };
100
101 struct rt_cache_stat
102 {
103 unsigned int in_hit;
104 unsigned int in_slow_tot;
105 unsigned int in_slow_mc;
106 unsigned int in_no_route;
107 unsigned int in_brd;
108 unsigned int in_martian_dst;
109 unsigned int in_martian_src;
110 unsigned int out_hit;
111 unsigned int out_slow_tot;
112 unsigned int out_slow_mc;
113 unsigned int gc_total;
114 unsigned int gc_ignored;
115 unsigned int gc_goal_miss;
116 unsigned int gc_dst_overflow;
117 unsigned int in_hlist_search;
118 unsigned int out_hlist_search;
119 } ____cacheline_aligned_in_smp;
120
121 extern struct ip_rt_acct *ip_rt_acct;
122
123 struct in_device;
124 extern void ip_rt_init(void);
125 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
126 u32 src, u8 tos, struct net_device *dev);
127 extern void ip_rt_advice(struct rtable **rp, int advice);
128 extern void rt_cache_flush(int how);
129 extern int ip_route_output_key(struct rtable **, const struct rt_key *key);
130 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
131 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
132 extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu);
133 extern void ip_rt_send_redirect(struct sk_buff *skb);
134
135 extern unsigned inet_addr_type(u32 addr);
136 extern void ip_rt_multicast_event(struct in_device *);
137 extern int ip_rt_ioctl(unsigned int cmd, void *arg);
138 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
139 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
140
141 /* Deprecated: use ip_route_output_key directly */
ip_route_output(struct rtable ** rp,u32 daddr,u32 saddr,u32 tos,int oif)142 static inline int ip_route_output(struct rtable **rp,
143 u32 daddr, u32 saddr, u32 tos, int oif)
144 {
145 struct rt_key key = { dst:daddr, src:saddr, oif:oif, tos:tos };
146
147 return ip_route_output_key(rp, &key);
148 }
149
150
ip_rt_put(struct rtable * rt)151 static inline void ip_rt_put(struct rtable * rt)
152 {
153 if (rt)
154 dst_release(&rt->u.dst);
155 }
156
157 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
158
159 extern __u8 ip_tos2prio[16];
160
rt_tos2priority(u8 tos)161 static inline char rt_tos2priority(u8 tos)
162 {
163 return ip_tos2prio[IPTOS_TOS(tos)>>1];
164 }
165
ip_route_connect(struct rtable ** rp,u32 dst,u32 src,u32 tos,int oif)166 static inline int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif)
167 {
168 int err;
169 err = ip_route_output(rp, dst, src, tos, oif);
170 if (err || (dst && src))
171 return err;
172 dst = (*rp)->rt_dst;
173 src = (*rp)->rt_src;
174 ip_rt_put(*rp);
175 *rp = NULL;
176 return ip_route_output(rp, dst, src, tos, oif);
177 }
178
179 extern void rt_bind_peer(struct rtable *rt, int create);
180
rt_get_peer(struct rtable * rt)181 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
182 {
183 if (rt->peer)
184 return rt->peer;
185
186 rt_bind_peer(rt, 0);
187 return rt->peer;
188 }
189
190 #endif /* _ROUTE_H */
191