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))
65 __be32 rt_dst; /* Path destination */
66 __be32 rt_src; /* Path source */
71 /* Info on neighbour */
74 /* Miscellaneous cached information */
75 __be32 rt_spec_dst; /* RFC1122 specific destination */
77 struct inet_peer *peer; /* long-living peer info */
78 struct fib_info *fi; /* for client ref to shared metrics */
81 static inline bool rt_is_input_route(struct rtable *rt)
83 return rt->rt_iif != 0;
86 static inline bool rt_is_output_route(struct rtable *rt)
88 return rt->rt_iif == 0;
98 struct rt_cache_stat {
100 unsigned int in_slow_tot;
101 unsigned int in_slow_mc;
102 unsigned int in_no_route;
104 unsigned int in_martian_dst;
105 unsigned int in_martian_src;
106 unsigned int out_hit;
107 unsigned int out_slow_tot;
108 unsigned int out_slow_mc;
109 unsigned int gc_total;
110 unsigned int gc_ignored;
111 unsigned int gc_goal_miss;
112 unsigned int gc_dst_overflow;
113 unsigned int in_hlist_search;
114 unsigned int out_hlist_search;
117 extern struct ip_rt_acct __percpu *ip_rt_acct;
120 extern int ip_rt_init(void);
121 extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
122 __be32 src, struct net_device *dev);
123 extern void rt_cache_flush(struct net *net, int how);
124 extern void rt_cache_flush_batch(struct net *net);
125 extern struct rtable *__ip_route_output_key(struct net *, const struct flowi4 *flp);
126 extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
128 extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);
130 static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
132 return ip_route_output_flow(net, flp, NULL);
135 static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
136 __be32 saddr, u8 tos, int oif)
138 struct flowi4 fl4 = {
144 return ip_route_output_key(net, &fl4);
147 static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk,
148 __be32 daddr, __be32 saddr,
149 __be16 dport, __be16 sport,
150 __u8 proto, __u8 tos, int oif)
152 struct flowi4 fl4 = {
154 .flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0,
155 .flowi4_mark = sk ? sk->sk_mark : 0,
159 .flowi4_proto = proto,
164 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
165 return ip_route_output_flow(net, &fl4, sk);
168 static inline struct rtable *ip_route_output_gre(struct net *net,
169 __be32 daddr, __be32 saddr,
170 __be32 gre_key, __u8 tos, int oif)
172 struct flowi4 fl4 = {
177 .flowi4_proto = IPPROTO_GRE,
178 .fl4_gre_key = gre_key,
180 return ip_route_output_key(net, &fl4);
183 extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
184 u8 tos, struct net_device *devin, bool noref);
186 static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
187 u8 tos, struct net_device *devin)
189 return ip_route_input_common(skb, dst, src, tos, devin, false);
192 static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
193 u8 tos, struct net_device *devin)
195 return ip_route_input_common(skb, dst, src, tos, devin, true);
198 extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
199 extern void ip_rt_send_redirect(struct sk_buff *skb);
201 extern unsigned inet_addr_type(struct net *net, __be32 addr);
202 extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
203 extern void ip_rt_multicast_event(struct in_device *);
204 extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
205 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
206 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
209 extern void fib_add_ifaddr(struct in_ifaddr *);
211 static inline void ip_rt_put(struct rtable * rt)
214 dst_release(&rt->dst);
217 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
219 extern const __u8 ip_tos2prio[16];
221 static inline char rt_tos2priority(u8 tos)
223 return ip_tos2prio[IPTOS_TOS(tos)>>1];
226 static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
227 int oif, u8 protocol,
228 __be16 sport, __be16 dport,
229 struct sock *sk, bool can_sleep)
231 struct flowi4 fl4 = {
233 .flowi4_mark = sk->sk_mark,
237 .flowi4_proto = protocol,
241 struct net *net = sock_net(sk);
244 if (inet_sk(sk)->transparent)
245 fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
246 if (protocol == IPPROTO_TCP)
247 fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
249 fl4.flowi4_flags |= FLOWI_FLAG_CAN_SLEEP;
252 rt = __ip_route_output_key(net, &fl4);
255 fl4.daddr = rt->rt_dst;
256 fl4.saddr = rt->rt_src;
259 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
260 return ip_route_output_flow(net, &fl4, sk);
263 static inline struct rtable *ip_route_newports(struct rtable *rt,
264 u8 protocol, __be16 orig_sport,
265 __be16 orig_dport, __be16 sport,
266 __be16 dport, struct sock *sk)
268 if (sport != orig_sport || dport != orig_dport) {
269 struct flowi4 fl4 = {
270 .flowi4_oif = rt->rt_oif,
271 .flowi4_mark = rt->rt_mark,
272 .daddr = rt->rt_key_dst,
273 .saddr = rt->rt_key_src,
274 .flowi4_tos = rt->rt_tos,
275 .flowi4_proto = protocol,
279 if (inet_sk(sk)->transparent)
280 fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
281 if (protocol == IPPROTO_TCP)
282 fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
284 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
285 return ip_route_output_flow(sock_net(sk), &fl4, sk);
290 extern void rt_bind_peer(struct rtable *rt, int create);
292 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
301 static inline int inet_iif(const struct sk_buff *skb)
303 return skb_rtable(skb)->rt_iif;
306 extern int sysctl_ip_default_ttl;
308 static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
310 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
313 hoplimit = sysctl_ip_default_ttl;
317 #endif /* _ROUTE_H */