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 <net/inet_sock.h>
31 #include <linux/in_route.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/route.h>
35 #include <linux/cache.h>
36 #include <linux/security.h>
39 #warning This file is not supposed to be used outside of kernel.
42 #define RTO_ONLINK 0x01
45 /* RTO_CONN is not used (being alias for 0), but preserved not to break
46 * some modules referring to it. */
48 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
59 /* Cache lookup keys */
62 struct in_device *idev;
68 __be32 rt_dst; /* Path destination */
69 __be32 rt_src; /* Path source */
72 /* Info on neighbour */
75 /* Miscellaneous cached information */
76 __be32 rt_spec_dst; /* RFC1122 specific destination */
77 struct inet_peer *peer; /* long-living peer info */
91 unsigned int in_slow_tot;
92 unsigned int in_slow_mc;
93 unsigned int in_no_route;
95 unsigned int in_martian_dst;
96 unsigned int in_martian_src;
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;
108 extern struct ip_rt_acct *ip_rt_acct;
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);
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);
130 extern void fib_add_ifaddr(struct in_ifaddr *);
132 static inline void ip_rt_put(struct rtable * rt)
135 dst_release(&rt->u.dst);
138 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
140 extern const __u8 ip_tos2prio[16];
142 static inline char rt_tos2priority(u8 tos)
144 return ip_tos2prio[IPTOS_TOS(tos)>>1];
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,
152 struct flowi fl = { .oif = oif,
154 .nl_u = { .ip4_u = { .daddr = dst,
160 .dport = dport } } };
163 struct net *net = sock_net(sk);
165 if (inet_sk(sk)->transparent)
166 fl.flags |= FLOWI_FLAG_ANYSRC;
169 err = __ip_route_output_key(net, rp, &fl);
172 fl.fl4_dst = (*rp)->rt_dst;
173 fl.fl4_src = (*rp)->rt_src;
177 security_sk_classify_flow(sk, &fl);
178 return ip_route_output_flow(net, rp, &fl, sk, flags);
181 static inline int ip_route_newports(struct rtable **rp, u8 protocol,
182 __be16 sport, __be16 dport, struct sock *sk)
184 if (sport != (*rp)->fl.fl_ip_sport ||
185 dport != (*rp)->fl.fl_ip_dport) {
188 memcpy(&fl, &(*rp)->fl, sizeof(fl));
189 fl.fl_ip_sport = sport;
190 fl.fl_ip_dport = dport;
194 security_sk_classify_flow(sk, &fl);
195 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
200 extern void rt_bind_peer(struct rtable *rt, int create);
202 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
211 static inline int inet_iif(const struct sk_buff *skb)
213 return skb->rtable->rt_iif;
216 #endif /* _ROUTE_H */