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))
48 unsigned int rt_flags
;
54 /* Info on neighbour */
57 /* Miscellaneous cached information */
61 static inline bool rt_is_input_route(const struct rtable
*rt
)
63 return rt
->rt_is_input
!= 0;
66 static inline bool rt_is_output_route(const struct rtable
*rt
)
68 return rt
->rt_is_input
== 0;
71 static inline __be32
rt_nexthop(const struct rtable
*rt
, __be32 daddr
)
74 return rt
->rt_gateway
;
85 struct rt_cache_stat
{
87 unsigned int in_slow_tot
;
88 unsigned int in_slow_mc
;
89 unsigned int in_no_route
;
91 unsigned int in_martian_dst
;
92 unsigned int in_martian_src
;
94 unsigned int out_slow_tot
;
95 unsigned int out_slow_mc
;
96 unsigned int gc_total
;
97 unsigned int gc_ignored
;
98 unsigned int gc_goal_miss
;
99 unsigned int gc_dst_overflow
;
100 unsigned int in_hlist_search
;
101 unsigned int out_hlist_search
;
104 extern struct ip_rt_acct __percpu
*ip_rt_acct
;
107 extern int ip_rt_init(void);
108 extern void rt_cache_flush(struct net
*net
, int how
);
109 extern struct rtable
*__ip_route_output_key(struct net
*, struct flowi4
*flp
);
110 extern struct rtable
*ip_route_output_flow(struct net
*, struct flowi4
*flp
,
112 extern struct dst_entry
*ipv4_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
);
114 static inline struct rtable
*ip_route_output_key(struct net
*net
, struct flowi4
*flp
)
116 return ip_route_output_flow(net
, flp
, NULL
);
119 static inline struct rtable
*ip_route_output(struct net
*net
, __be32 daddr
,
120 __be32 saddr
, u8 tos
, int oif
)
122 struct flowi4 fl4
= {
128 return ip_route_output_key(net
, &fl4
);
131 static inline struct rtable
*ip_route_output_ports(struct net
*net
, struct flowi4
*fl4
,
133 __be32 daddr
, __be32 saddr
,
134 __be16 dport
, __be16 sport
,
135 __u8 proto
, __u8 tos
, int oif
)
137 flowi4_init_output(fl4
, oif
, sk
? sk
->sk_mark
: 0, tos
,
138 RT_SCOPE_UNIVERSE
, proto
,
139 sk
? inet_sk_flowi_flags(sk
) : 0,
140 daddr
, saddr
, dport
, sport
);
142 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
143 return ip_route_output_flow(net
, fl4
, sk
);
146 static inline struct rtable
*ip_route_output_gre(struct net
*net
, struct flowi4
*fl4
,
147 __be32 daddr
, __be32 saddr
,
148 __be32 gre_key
, __u8 tos
, int oif
)
150 memset(fl4
, 0, sizeof(*fl4
));
151 fl4
->flowi4_oif
= oif
;
154 fl4
->flowi4_tos
= tos
;
155 fl4
->flowi4_proto
= IPPROTO_GRE
;
156 fl4
->fl4_gre_key
= gre_key
;
157 return ip_route_output_key(net
, fl4
);
160 extern int ip_route_input(struct sk_buff
*skb
, __be32 dst
, __be32 src
,
161 u8 tos
, struct net_device
*devin
);
163 extern void ipv4_update_pmtu(struct sk_buff
*skb
, struct net
*net
, u32 mtu
,
164 int oif
, u32 mark
, u8 protocol
, int flow_flags
);
165 extern void ipv4_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, u32 mtu
);
166 extern void ipv4_redirect(struct sk_buff
*skb
, struct net
*net
,
167 int oif
, u32 mark
, u8 protocol
, int flow_flags
);
168 extern void ipv4_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
169 extern void ip_rt_send_redirect(struct sk_buff
*skb
);
171 extern unsigned int inet_addr_type(struct net
*net
, __be32 addr
);
172 extern unsigned int inet_dev_addr_type(struct net
*net
, const struct net_device
*dev
, __be32 addr
);
173 extern void ip_rt_multicast_event(struct in_device
*);
174 extern int ip_rt_ioctl(struct net
*, unsigned int cmd
, void __user
*arg
);
175 extern void ip_rt_get_source(u8
*src
, struct sk_buff
*skb
, struct rtable
*rt
);
176 extern int ip_rt_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
);
179 extern void fib_add_ifaddr(struct in_ifaddr
*);
180 extern void fib_del_ifaddr(struct in_ifaddr
*, struct in_ifaddr
*);
182 static inline void ip_rt_put(struct rtable
* rt
)
185 dst_release(&rt
->dst
);
188 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
190 extern const __u8 ip_tos2prio
[16];
192 static inline char rt_tos2priority(u8 tos
)
194 return ip_tos2prio
[IPTOS_TOS(tos
)>>1];
197 /* ip_route_connect() and ip_route_newports() work in tandem whilst
198 * binding a socket for a new outgoing connection.
200 * In order to use IPSEC properly, we must, in the end, have a
201 * route that was looked up using all available keys including source
202 * and destination ports.
204 * However, if a source port needs to be allocated (the user specified
205 * a wildcard source port) we need to obtain addressing information
206 * in order to perform that allocation.
208 * So ip_route_connect() looks up a route using wildcarded source and
209 * destination ports in the key, simply so that we can get a pair of
210 * addresses to use for port allocation.
212 * Later, once the ports are allocated, ip_route_newports() will make
213 * another route lookup if needed to make sure we catch any IPSEC
214 * rules keyed on the port information.
216 * The callers allocate the flow key on their stack, and must pass in
217 * the same flowi4 object to both the ip_route_connect() and the
218 * ip_route_newports() calls.
221 static inline void ip_route_connect_init(struct flowi4
*fl4
, __be32 dst
, __be32 src
,
222 u32 tos
, int oif
, u8 protocol
,
223 __be16 sport
, __be16 dport
,
224 struct sock
*sk
, bool can_sleep
)
228 if (inet_sk(sk
)->transparent
)
229 flow_flags
|= FLOWI_FLAG_ANYSRC
;
231 flow_flags
|= FLOWI_FLAG_CAN_SLEEP
;
233 flowi4_init_output(fl4
, oif
, sk
->sk_mark
, tos
, RT_SCOPE_UNIVERSE
,
234 protocol
, flow_flags
, dst
, src
, dport
, sport
);
237 static inline struct rtable
*ip_route_connect(struct flowi4
*fl4
,
238 __be32 dst
, __be32 src
, u32 tos
,
239 int oif
, u8 protocol
,
240 __be16 sport
, __be16 dport
,
241 struct sock
*sk
, bool can_sleep
)
243 struct net
*net
= sock_net(sk
);
246 ip_route_connect_init(fl4
, dst
, src
, tos
, oif
, protocol
,
247 sport
, dport
, sk
, can_sleep
);
250 rt
= __ip_route_output_key(net
, fl4
);
254 flowi4_update_output(fl4
, oif
, tos
, fl4
->daddr
, fl4
->saddr
);
256 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
257 return ip_route_output_flow(net
, fl4
, sk
);
260 static inline struct rtable
*ip_route_newports(struct flowi4
*fl4
, struct rtable
*rt
,
261 __be16 orig_sport
, __be16 orig_dport
,
262 __be16 sport
, __be16 dport
,
265 if (sport
!= orig_sport
|| dport
!= orig_dport
) {
266 fl4
->fl4_dport
= dport
;
267 fl4
->fl4_sport
= sport
;
269 flowi4_update_output(fl4
, sk
->sk_bound_dev_if
,
270 RT_CONN_FLAGS(sk
), fl4
->daddr
,
272 security_sk_classify_flow(sk
, flowi4_to_flowi(fl4
));
273 return ip_route_output_flow(sock_net(sk
), fl4
, sk
);
278 static inline int inet_iif(const struct sk_buff
*skb
)
280 int iif
= skb_rtable(skb
)->rt_iif
;
287 extern int sysctl_ip_default_ttl
;
289 static inline int ip4_dst_hoplimit(const struct dst_entry
*dst
)
291 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
294 hoplimit
= sysctl_ip_default_ttl
;
298 #endif /* _ROUTE_H */
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