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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>
38 #define RTO_ONLINK 0x01
40 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
52 unsigned int rt_flags
;
56 __be32 rt_dst
; /* Path destination */
57 __be32 rt_src
; /* Path source */
63 /* Info on neighbour */
66 /* Miscellaneous cached information */
68 struct fib_info
*fi
; /* for client ref to shared metrics */
71 static inline bool rt_is_input_route(const struct rtable
*rt
)
73 return rt
->rt_route_iif
!= 0;
76 static inline bool rt_is_output_route(const struct rtable
*rt
)
78 return rt
->rt_route_iif
== 0;
88 struct rt_cache_stat
{
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 __percpu
*ip_rt_acct
;
110 extern int ip_rt_init(void);
111 extern void rt_cache_flush(struct net
*net
, int how
);
112 extern struct rtable
*__ip_route_output_key(struct net
*, struct flowi4
*flp
);
113 extern struct rtable
*ip_route_output_flow(struct net
*, struct flowi4
*flp
,
115 extern struct dst_entry
*ipv4_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
);
117 static inline struct rtable
*ip_route_output_key(struct net
*net
, struct flowi4
*flp
)
119 return ip_route_output_flow(net
, flp
, NULL
);
122 static inline struct rtable
*ip_route_output(struct net
*net
, __be32 daddr
,
123 __be32 saddr
, u8 tos
, int oif
)
125 struct flowi4 fl4
= {
131 return ip_route_output_key(net
, &fl4
);
134 static inline struct rtable
*ip_route_output_ports(struct net
*net
, struct flowi4
*fl4
,
136 __be32 daddr
, __be32 saddr
,
137 __be16 dport
, __be16 sport
,
138 __u8 proto
, __u8 tos
, int oif
)
140 flowi4_init_output(fl4
, oif
, sk
? sk
->sk_mark
: 0, tos
,
141 RT_SCOPE_UNIVERSE
, proto
,
142 sk
? inet_sk_flowi_flags(sk
) : 0,
143 daddr
, saddr
, dport
, sport
);
145 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
146 return ip_route_output_flow(net
, fl4
, sk
);
149 static inline struct rtable
*ip_route_output_gre(struct net
*net
, struct flowi4
*fl4
,
150 __be32 daddr
, __be32 saddr
,
151 __be32 gre_key
, __u8 tos
, int oif
)
153 memset(fl4
, 0, sizeof(*fl4
));
154 fl4
->flowi4_oif
= oif
;
157 fl4
->flowi4_tos
= tos
;
158 fl4
->flowi4_proto
= IPPROTO_GRE
;
159 fl4
->fl4_gre_key
= gre_key
;
160 return ip_route_output_key(net
, fl4
);
163 extern int ip_route_input_common(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
164 u8 tos
, struct net_device
*devin
, bool noref
);
166 static inline int ip_route_input(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
167 u8 tos
, struct net_device
*devin
)
169 return ip_route_input_common(skb
, dst
, src
, tos
, devin
, false);
172 static inline int ip_route_input_noref(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
173 u8 tos
, struct net_device
*devin
)
175 return ip_route_input_common(skb
, dst
, src
, tos
, devin
, true);
178 extern void ipv4_update_pmtu(struct sk_buff
*skb
, struct net
*net
, u32 mtu
,
179 int oif
, u32 mark
, u8 protocol
, int flow_flags
);
180 extern void ipv4_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, u32 mtu
);
181 extern void ipv4_redirect(struct sk_buff
*skb
, struct net
*net
,
182 int oif
, u32 mark
, u8 protocol
, int flow_flags
);
183 extern void ipv4_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
184 extern void ip_rt_send_redirect(struct sk_buff
*skb
);
186 extern unsigned int inet_addr_type(struct net
*net
, __be32 addr
);
187 extern unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
, __be32 addr
);
188 extern void ip_rt_multicast_event(struct in_device
*);
189 extern int ip_rt_ioctl(struct net
*, unsigned int cmd
, void __user
*arg
);
190 extern void ip_rt_get_source(u8
*src
, struct sk_buff
*skb
, struct rtable
*rt
);
191 extern int ip_rt_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
);
194 extern void fib_add_ifaddr(struct in_ifaddr
*);
195 extern void fib_del_ifaddr(struct in_ifaddr
*, struct in_ifaddr
*);
197 static inline void ip_rt_put(struct rtable
* rt
)
200 dst_release(&rt
->dst
);
203 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
205 extern const __u8 ip_tos2prio
[16];
207 static inline char rt_tos2priority(u8 tos
)
209 return ip_tos2prio
[IPTOS_TOS(tos
)>>1];
212 /* ip_route_connect() and ip_route_newports() work in tandem whilst
213 * binding a socket for a new outgoing connection.
215 * In order to use IPSEC properly, we must, in the end, have a
216 * route that was looked up using all available keys including source
217 * and destination ports.
219 * However, if a source port needs to be allocated (the user specified
220 * a wildcard source port) we need to obtain addressing information
221 * in order to perform that allocation.
223 * So ip_route_connect() looks up a route using wildcarded source and
224 * destination ports in the key, simply so that we can get a pair of
225 * addresses to use for port allocation.
227 * Later, once the ports are allocated, ip_route_newports() will make
228 * another route lookup if needed to make sure we catch any IPSEC
229 * rules keyed on the port information.
231 * The callers allocate the flow key on their stack, and must pass in
232 * the same flowi4 object to both the ip_route_connect() and the
233 * ip_route_newports() calls.
236 static inline void ip_route_connect_init(struct flowi4
*fl4
, __be32 dst
, __be32 src
,
237 u32 tos
, int oif
, u8 protocol
,
238 __be16 sport
, __be16 dport
,
239 struct sock
*sk
, bool can_sleep
)
243 if (inet_sk(sk
)->transparent
)
244 flow_flags
|= FLOWI_FLAG_ANYSRC
;
246 flow_flags
|= FLOWI_FLAG_CAN_SLEEP
;
248 flowi4_init_output(fl4
, oif
, sk
->sk_mark
, tos
, RT_SCOPE_UNIVERSE
,
249 protocol
, flow_flags
, dst
, src
, dport
, sport
);
252 static inline struct rtable
*ip_route_connect(struct flowi4
*fl4
,
253 __be32 dst
, __be32 src
, u32 tos
,
254 int oif
, u8 protocol
,
255 __be16 sport
, __be16 dport
,
256 struct sock
*sk
, bool can_sleep
)
258 struct net
*net
= sock_net(sk
);
261 ip_route_connect_init(fl4
, dst
, src
, tos
, oif
, protocol
,
262 sport
, dport
, sk
, can_sleep
);
265 rt
= __ip_route_output_key(net
, fl4
);
269 flowi4_update_output(fl4
, oif
, tos
, fl4
->daddr
, fl4
->saddr
);
271 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
272 return ip_route_output_flow(net
, fl4
, sk
);
275 static inline struct rtable
*ip_route_newports(struct flowi4
*fl4
, struct rtable
*rt
,
276 __be16 orig_sport
, __be16 orig_dport
,
277 __be16 sport
, __be16 dport
,
280 if (sport
!= orig_sport
|| dport
!= orig_dport
) {
281 fl4
->fl4_dport
= dport
;
282 fl4
->fl4_sport
= sport
;
284 flowi4_update_output(fl4
, sk
->sk_bound_dev_if
,
285 RT_CONN_FLAGS(sk
), fl4
->daddr
,
287 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
288 return ip_route_output_flow(sock_net(sk
), fl4
, sk
);
293 static inline int inet_iif(const struct sk_buff
*skb
)
295 return skb_rtable(skb
)->rt_iif
;
298 extern int sysctl_ip_default_ttl
;
300 static inline int ip4_dst_hoplimit(const struct dst_entry
*dst
)
302 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
305 hoplimit
= sysctl_ip_default_ttl
;
309 #endif /* _ROUTE_H */