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))
55 /* Cache lookup keys */
62 __be32 rt_dst; /* Path destination */
63 __be32 rt_src; /* Path source */
66 /* Info on neighbour */
69 /* Miscellaneous cached information */
70 __be32 rt_spec_dst; /* RFC1122 specific destination */
71 struct inet_peer *peer; /* long-living peer info */
81 struct rt_cache_stat {
83 unsigned int in_slow_tot;
84 unsigned int in_slow_mc;
85 unsigned int in_no_route;
87 unsigned int in_martian_dst;
88 unsigned int in_martian_src;
90 unsigned int out_slow_tot;
91 unsigned int out_slow_mc;
92 unsigned int gc_total;
93 unsigned int gc_ignored;
94 unsigned int gc_goal_miss;
95 unsigned int gc_dst_overflow;
96 unsigned int in_hlist_search;
97 unsigned int out_hlist_search;
100 extern struct ip_rt_acct __percpu *ip_rt_acct;
103 extern int ip_rt_init(void);
104 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
105 __be32 src, struct net_device *dev);
106 extern void rt_cache_flush(struct net *net, int how);
107 extern void rt_cache_flush_batch(void);
108 extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp);
109 extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
110 extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
112 extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
113 u8 tos, struct net_device *devin, bool noref);
115 static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
116 u8 tos, struct net_device *devin)
118 return ip_route_input_common(skb, dst, src, tos, devin, false);
121 static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
122 u8 tos, struct net_device *devin)
124 return ip_route_input_common(skb, dst, src, tos, devin, true);
127 extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
128 extern void ip_rt_send_redirect(struct sk_buff *skb);
130 extern unsigned inet_addr_type(struct net *net, __be32 addr);
131 extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
132 extern void ip_rt_multicast_event(struct in_device *);
133 extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
134 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
135 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
138 extern void fib_add_ifaddr(struct in_ifaddr *);
140 static inline void ip_rt_put(struct rtable * rt)
143 dst_release(&rt->dst);
146 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
148 extern const __u8 ip_tos2prio[16];
150 static inline char rt_tos2priority(u8 tos)
152 return ip_tos2prio[IPTOS_TOS(tos)>>1];
155 static inline int ip_route_connect(struct rtable **rp, __be32 dst,
156 __be32 src, u32 tos, int oif, u8 protocol,
157 __be16 sport, __be16 dport, struct sock *sk,
160 struct flowi fl = { .oif = oif,
162 .nl_u = { .ip4_u = { .daddr = dst,
168 .dport = dport } } };
171 struct net *net = sock_net(sk);
173 if (inet_sk(sk)->transparent)
174 fl.flags |= FLOWI_FLAG_ANYSRC;
177 err = __ip_route_output_key(net, rp, &fl);
180 fl.fl4_dst = (*rp)->rt_dst;
181 fl.fl4_src = (*rp)->rt_src;
185 security_sk_classify_flow(sk, &fl);
186 return ip_route_output_flow(net, rp, &fl, sk, flags);
189 static inline int ip_route_newports(struct rtable **rp, u8 protocol,
190 __be16 sport, __be16 dport, struct sock *sk)
192 if (sport != (*rp)->fl.fl_ip_sport ||
193 dport != (*rp)->fl.fl_ip_dport) {
196 memcpy(&fl, &(*rp)->fl, sizeof(fl));
197 fl.fl_ip_sport = sport;
198 fl.fl_ip_dport = dport;
200 if (inet_sk(sk)->transparent)
201 fl.flags |= FLOWI_FLAG_ANYSRC;
204 security_sk_classify_flow(sk, &fl);
205 return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0);
210 extern void rt_bind_peer(struct rtable *rt, int create);
212 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
221 static inline int inet_iif(const struct sk_buff *skb)
223 return skb_rtable(skb)->rt_iif;
226 #endif /* _ROUTE_H */