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
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.
28 #include <net/inetpeer.h>
30 #include <linux/in_route.h>
31 #include <linux/rtnetlink.h>
32 #include <linux/route.h>
34 #include <linux/cache.h>
37 #warning This file is not supposed to be used outside of kernel.
40 #define RTO_ONLINK 0x01
43 /* RTO_CONN is not used (being alias for 0), but preserved not to break
44 * some modules referring to it. */
46 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
55 struct rtable *rt_next;
58 struct in_device *idev;
62 __u16 rt_multipath_alg;
64 __u32 rt_dst; /* Path destination */
65 __u32 rt_src; /* Path source */
68 /* Info on neighbour */
71 /* Cache lookup keys */
74 /* Miscellaneous cached information */
75 __u32 rt_spec_dst; /* RFC1122 specific destination */
76 struct inet_peer *peer; /* long-living peer info */
90 unsigned int in_slow_tot;
91 unsigned int in_slow_mc;
92 unsigned int in_no_route;
94 unsigned int in_martian_dst;
95 unsigned int in_martian_src;
97 unsigned int out_slow_tot;
98 unsigned int out_slow_mc;
99 unsigned int gc_total;
100 unsigned int gc_ignored;
101 unsigned int gc_goal_miss;
102 unsigned int gc_dst_overflow;
103 unsigned int in_hlist_search;
104 unsigned int out_hlist_search;
107 extern struct ip_rt_acct *ip_rt_acct;
110 extern int ip_rt_init(void);
111 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
112 u32 src, struct net_device *dev);
113 extern void ip_rt_advice(struct rtable **rp, int advice);
114 extern void rt_cache_flush(int how);
115 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
116 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
117 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
118 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
119 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
120 extern void ip_rt_send_redirect(struct sk_buff *skb);
122 extern unsigned inet_addr_type(u32 addr);
123 extern void ip_rt_multicast_event(struct in_device *);
124 extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
125 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
126 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
129 extern void fib_add_ifaddr(struct in_ifaddr *);
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, u8 protocol,
173 u16 sport, u16 dport, struct sock *sk)
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;
185 return ip_route_output_flow(rp, &fl, sk, 0);
190 extern void rt_bind_peer(struct rtable *rt, int create);
192 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
201 extern ctl_table ipv4_route_table[];
203 #endif /* _ROUTE_H */