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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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. | |
5 | * | |
6 | * Definitions for the IP router. | |
7 | * | |
8 | * Version: @(#)route.h 1.0.4 05/27/93 | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Fixes: | |
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 | |
18 | * | |
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. | |
23 | */ | |
24 | #ifndef _ROUTE_H | |
25 | #define _ROUTE_H | |
26 | ||
1da177e4 LT |
27 | #include <net/dst.h> |
28 | #include <net/inetpeer.h> | |
29 | #include <net/flow.h> | |
79876874 | 30 | #include <net/inet_sock.h> |
1da177e4 LT |
31 | #include <linux/in_route.h> |
32 | #include <linux/rtnetlink.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/ip.h> | |
35 | #include <linux/cache.h> | |
beb8d13b | 36 | #include <linux/security.h> |
1da177e4 LT |
37 | |
38 | #ifndef __KERNEL__ | |
39 | #warning This file is not supposed to be used outside of kernel. | |
40 | #endif | |
41 | ||
42 | #define RTO_ONLINK 0x01 | |
43 | ||
44 | #define RTO_CONN 0 | |
45 | /* RTO_CONN is not used (being alias for 0), but preserved not to break | |
46 | * some modules referring to it. */ | |
47 | ||
48 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) | |
49 | ||
50 | struct fib_nh; | |
51 | struct inet_peer; | |
fd2c3ef7 | 52 | struct rtable { |
d8d1f30b | 53 | struct dst_entry dst; |
1da177e4 | 54 | |
093c2ca4 ED |
55 | /* Cache lookup keys */ |
56 | struct flowi fl; | |
57 | ||
29e75252 | 58 | int rt_genid; |
1da177e4 LT |
59 | unsigned rt_flags; |
60 | __u16 rt_type; | |
1da177e4 | 61 | |
f2c3fe24 AV |
62 | __be32 rt_dst; /* Path destination */ |
63 | __be32 rt_src; /* Path source */ | |
1da177e4 LT |
64 | int rt_iif; |
65 | ||
66 | /* Info on neighbour */ | |
f2c3fe24 | 67 | __be32 rt_gateway; |
1da177e4 | 68 | |
1da177e4 | 69 | /* Miscellaneous cached information */ |
f2c3fe24 | 70 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
1da177e4 LT |
71 | struct inet_peer *peer; /* long-living peer info */ |
72 | }; | |
73 | ||
c7537967 DM |
74 | static inline bool rt_is_input_route(struct rtable *rt) |
75 | { | |
76 | return rt->fl.iif != 0; | |
77 | } | |
78 | ||
79 | static inline bool rt_is_output_route(struct rtable *rt) | |
80 | { | |
81 | return rt->fl.iif == 0; | |
82 | } | |
83 | ||
fd2c3ef7 | 84 | struct ip_rt_acct { |
1da177e4 LT |
85 | __u32 o_bytes; |
86 | __u32 o_packets; | |
87 | __u32 i_bytes; | |
88 | __u32 i_packets; | |
89 | }; | |
90 | ||
fd2c3ef7 | 91 | struct rt_cache_stat { |
1da177e4 LT |
92 | unsigned int in_hit; |
93 | unsigned int in_slow_tot; | |
94 | unsigned int in_slow_mc; | |
95 | unsigned int in_no_route; | |
96 | unsigned int in_brd; | |
97 | unsigned int in_martian_dst; | |
98 | unsigned int in_martian_src; | |
99 | unsigned int out_hit; | |
100 | unsigned int out_slow_tot; | |
101 | unsigned int out_slow_mc; | |
102 | unsigned int gc_total; | |
103 | unsigned int gc_ignored; | |
104 | unsigned int gc_goal_miss; | |
105 | unsigned int gc_dst_overflow; | |
106 | unsigned int in_hlist_search; | |
107 | unsigned int out_hlist_search; | |
108 | }; | |
109 | ||
7d720c3e | 110 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
111 | |
112 | struct in_device; | |
113 | extern int ip_rt_init(void); | |
f7655229 AV |
114 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
115 | __be32 src, struct net_device *dev); | |
76e6ebfb | 116 | extern void rt_cache_flush(struct net *net, int how); |
a5ee1551 | 117 | extern void rt_cache_flush_batch(void); |
611c183e | 118 | extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); |
f206351a | 119 | extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); |
f1b050bf | 120 | extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); |
407eadd9 ED |
121 | |
122 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, | |
123 | u8 tos, struct net_device *devin, bool noref); | |
124 | ||
125 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
126 | u8 tos, struct net_device *devin) | |
127 | { | |
128 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
129 | } | |
130 | ||
131 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
132 | u8 tos, struct net_device *devin) | |
133 | { | |
134 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
135 | } | |
136 | ||
0010e465 | 137 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
138 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
139 | ||
6b175b26 EB |
140 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
141 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 142 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 143 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
144 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
145 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
146 | ||
0ff60a45 JHS |
147 | struct in_ifaddr; |
148 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
149 | ||
1da177e4 LT |
150 | static inline void ip_rt_put(struct rtable * rt) |
151 | { | |
152 | if (rt) | |
d8d1f30b | 153 | dst_release(&rt->dst); |
1da177e4 LT |
154 | } |
155 | ||
156 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
157 | ||
4839c52b | 158 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
159 | |
160 | static inline char rt_tos2priority(u8 tos) | |
161 | { | |
162 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
163 | } | |
164 | ||
bada8adc AV |
165 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, |
166 | __be32 src, u32 tos, int oif, u8 protocol, | |
8eb9086f DM |
167 | __be16 sport, __be16 dport, struct sock *sk, |
168 | int flags) | |
1da177e4 LT |
169 | { |
170 | struct flowi fl = { .oif = oif, | |
4a19ec58 | 171 | .mark = sk->sk_mark, |
5811662b CG |
172 | .fl4_dst = dst, |
173 | .fl4_src = src, | |
174 | .fl4_tos = tos, | |
1da177e4 | 175 | .proto = protocol, |
5811662b CG |
176 | .fl_ip_sport = sport, |
177 | .fl_ip_dport = dport }; | |
1da177e4 | 178 | int err; |
3b1e0a65 | 179 | struct net *net = sock_net(sk); |
79876874 KK |
180 | |
181 | if (inet_sk(sk)->transparent) | |
182 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
183 | ||
1da177e4 | 184 | if (!dst || !src) { |
eee80592 | 185 | err = __ip_route_output_key(net, rp, &fl); |
1da177e4 LT |
186 | if (err) |
187 | return err; | |
188 | fl.fl4_dst = (*rp)->rt_dst; | |
189 | fl.fl4_src = (*rp)->rt_src; | |
190 | ip_rt_put(*rp); | |
191 | *rp = NULL; | |
192 | } | |
beb8d13b | 193 | security_sk_classify_flow(sk, &fl); |
eee80592 | 194 | return ip_route_output_flow(net, rp, &fl, sk, flags); |
1da177e4 LT |
195 | } |
196 | ||
5d39a795 | 197 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
39dccd9d | 198 | __be16 sport, __be16 dport, struct sock *sk) |
1da177e4 LT |
199 | { |
200 | if (sport != (*rp)->fl.fl_ip_sport || | |
201 | dport != (*rp)->fl.fl_ip_dport) { | |
202 | struct flowi fl; | |
203 | ||
204 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
205 | fl.fl_ip_sport = sport; | |
206 | fl.fl_ip_dport = dport; | |
5d39a795 | 207 | fl.proto = protocol; |
fb0c5f0b UW |
208 | if (inet_sk(sk)->transparent) |
209 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
1da177e4 LT |
210 | ip_rt_put(*rp); |
211 | *rp = NULL; | |
beb8d13b | 212 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 213 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); |
1da177e4 LT |
214 | } |
215 | return 0; | |
216 | } | |
217 | ||
218 | extern void rt_bind_peer(struct rtable *rt, int create); | |
219 | ||
220 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
221 | { | |
222 | if (rt->peer) | |
223 | return rt->peer; | |
224 | ||
225 | rt_bind_peer(rt, 0); | |
226 | return rt->peer; | |
227 | } | |
228 | ||
1668e010 KK |
229 | static inline int inet_iif(const struct sk_buff *skb) |
230 | { | |
511c3f92 | 231 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
232 | } |
233 | ||
323e126f DM |
234 | extern int sysctl_ip_default_ttl; |
235 | ||
236 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
237 | { | |
238 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
239 | ||
240 | if (hoplimit == 0) | |
241 | hoplimit = sysctl_ip_default_ttl; | |
242 | return hoplimit; | |
243 | } | |
244 | ||
1da177e4 | 245 | #endif /* _ROUTE_H */ |