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.
6 * Definitions for the IP router.
8 * Version: @(#)route.h 1.0.4 05/27/93
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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
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.
27 #include <linux/config.h>
29 #include <net/inetpeer.h>
31 #include <linux/in_route.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/route.h>
35 #include <linux/cache.h>
38 #warning This file is not supposed to be used outside of kernel.
41 #define RTO_ONLINK 0x01
44 /* RTO_CONN is not used (being alias for 0), but preserved not to break
45 * some modules referring to it. */
47 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sk->sk_localroute)
55 struct rtable *rt_next;
58 struct in_device *idev;
63 __u32 rt_dst; /* Path destination */
64 __u32 rt_src; /* Path source */
67 /* Info on neighbour */
70 /* Cache lookup keys */
73 /* Miscellaneous cached information */
74 __u32 rt_spec_dst; /* RFC1122 specific destination */
75 struct inet_peer *peer; /* long-living peer info */
89 unsigned int in_slow_tot;
90 unsigned int in_slow_mc;
91 unsigned int in_no_route;
93 unsigned int in_martian_dst;
94 unsigned int in_martian_src;
96 unsigned int out_slow_tot;
97 unsigned int out_slow_mc;
98 unsigned int gc_total;
99 unsigned int gc_ignored;
100 unsigned int gc_goal_miss;
101 unsigned int gc_dst_overflow;
102 unsigned int in_hlist_search;
103 unsigned int out_hlist_search;
106 extern struct rt_cache_stat *rt_cache_stat;
107 #define RT_CACHE_STAT_INC(field) \
108 (per_cpu_ptr(rt_cache_stat, smp_processor_id())->field++)
110 extern struct ip_rt_acct *ip_rt_acct;
113 extern int ip_rt_init(void);
114 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
115 u32 src, u8 tos, struct net_device *dev);
116 extern void ip_rt_advice(struct rtable **rp, int advice);
117 extern void rt_cache_flush(int how);
118 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
119 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
120 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
121 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
122 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
123 extern void ip_rt_send_redirect(struct sk_buff *skb);
125 extern unsigned inet_addr_type(u32 addr);
126 extern void ip_rt_multicast_event(struct in_device *);
127 extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
128 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
129 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
131 static inline void ip_rt_put(struct rtable * rt)
134 dst_release(&rt->u.dst);
137 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
139 extern __u8 ip_tos2prio[16];
141 static inline char rt_tos2priority(u8 tos)
143 return ip_tos2prio[IPTOS_TOS(tos)>>1];
146 static inline int ip_route_connect(struct rtable **rp, u32 dst,
147 u32 src, u32 tos, int oif, u8 protocol,
148 u16 sport, u16 dport, struct sock *sk)
150 struct flowi fl = { .oif = oif,
151 .nl_u = { .ip4_u = { .daddr = dst,
157 .dport = dport } } };
161 err = __ip_route_output_key(rp, &fl);
164 fl.fl4_dst = (*rp)->rt_dst;
165 fl.fl4_src = (*rp)->rt_src;
169 return ip_route_output_flow(rp, &fl, sk, 0);
172 static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
175 if (sport != (*rp)->fl.fl_ip_sport ||
176 dport != (*rp)->fl.fl_ip_dport) {
179 memcpy(&fl, &(*rp)->fl, sizeof(fl));
180 fl.fl_ip_sport = sport;
181 fl.fl_ip_dport = dport;
184 return ip_route_output_flow(rp, &fl, sk, 0);
189 extern void rt_bind_peer(struct rtable *rt, int create);
191 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
200 #endif /* _ROUTE_H */