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>
35 #include <linux/security.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) | sock_flag(sk, SOCK_LOCALROUTE))
58 /* Cache lookup keys */
61 struct in_device *idev;
66 __be32 rt_dst; /* Path destination */
67 __be32 rt_src; /* Path source */
70 /* Info on neighbour */
73 /* Miscellaneous cached information */
74 __be32 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 ip_rt_acct *ip_rt_acct;
109 extern int ip_rt_init(void);
110 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
111 __be32 src, struct net_device *dev);
112 extern void rt_cache_flush(int how);
113 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
114 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
115 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
116 extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
117 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
118 extern void ip_rt_send_redirect(struct sk_buff *skb);
120 extern unsigned inet_addr_type(__be32 addr);
121 extern void ip_rt_multicast_event(struct in_device *);
122 extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
123 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
124 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
127 extern void fib_add_ifaddr(struct in_ifaddr *);
129 static inline void ip_rt_put(struct rtable * rt)
132 dst_release(&rt->u.dst);
135 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
137 extern const __u8 ip_tos2prio[16];
139 static inline char rt_tos2priority(u8 tos)
141 return ip_tos2prio[IPTOS_TOS(tos)>>1];
144 static inline int ip_route_connect(struct rtable **rp, __be32 dst,
145 __be32 src, u32 tos, int oif, u8 protocol,
146 __be16 sport, __be16 dport, struct sock *sk,
149 struct flowi fl = { .oif = oif,
150 .nl_u = { .ip4_u = { .daddr = dst,
156 .dport = dport } } };
160 err = __ip_route_output_key(rp, &fl);
163 fl.fl4_dst = (*rp)->rt_dst;
164 fl.fl4_src = (*rp)->rt_src;
168 security_sk_classify_flow(sk, &fl);
169 return ip_route_output_flow(rp, &fl, sk, flags);
172 static inline int ip_route_newports(struct rtable **rp, u8 protocol,
173 __be16 sport, __be16 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 security_sk_classify_flow(sk, &fl);
186 return ip_route_output_flow(rp, &fl, sk, 0);
191 extern void rt_bind_peer(struct rtable *rt, int create);
193 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
202 extern ctl_table ipv4_route_table[];
204 #endif /* _ROUTE_H */