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; | |
62fa8a84 | 52 | struct fib_info; |
fd2c3ef7 | 53 | struct rtable { |
d8d1f30b | 54 | struct dst_entry dst; |
1da177e4 | 55 | |
093c2ca4 ED |
56 | /* Cache lookup keys */ |
57 | struct flowi fl; | |
58 | ||
29e75252 | 59 | int rt_genid; |
1da177e4 LT |
60 | unsigned rt_flags; |
61 | __u16 rt_type; | |
1da177e4 | 62 | |
f2c3fe24 AV |
63 | __be32 rt_dst; /* Path destination */ |
64 | __be32 rt_src; /* Path source */ | |
1da177e4 LT |
65 | int rt_iif; |
66 | ||
67 | /* Info on neighbour */ | |
f2c3fe24 | 68 | __be32 rt_gateway; |
1da177e4 | 69 | |
1da177e4 | 70 | /* Miscellaneous cached information */ |
f2c3fe24 | 71 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
1da177e4 | 72 | struct inet_peer *peer; /* long-living peer info */ |
62fa8a84 | 73 | struct fib_info *fi; /* for client ref to shared metrics */ |
1da177e4 LT |
74 | }; |
75 | ||
c7537967 DM |
76 | static inline bool rt_is_input_route(struct rtable *rt) |
77 | { | |
78 | return rt->fl.iif != 0; | |
79 | } | |
80 | ||
81 | static inline bool rt_is_output_route(struct rtable *rt) | |
82 | { | |
83 | return rt->fl.iif == 0; | |
84 | } | |
85 | ||
fd2c3ef7 | 86 | struct ip_rt_acct { |
1da177e4 LT |
87 | __u32 o_bytes; |
88 | __u32 o_packets; | |
89 | __u32 i_bytes; | |
90 | __u32 i_packets; | |
91 | }; | |
92 | ||
fd2c3ef7 | 93 | struct rt_cache_stat { |
1da177e4 LT |
94 | unsigned int in_hit; |
95 | unsigned int in_slow_tot; | |
96 | unsigned int in_slow_mc; | |
97 | unsigned int in_no_route; | |
98 | unsigned int in_brd; | |
99 | unsigned int in_martian_dst; | |
100 | unsigned int in_martian_src; | |
101 | unsigned int out_hit; | |
102 | unsigned int out_slow_tot; | |
103 | unsigned int out_slow_mc; | |
104 | unsigned int gc_total; | |
105 | unsigned int gc_ignored; | |
106 | unsigned int gc_goal_miss; | |
107 | unsigned int gc_dst_overflow; | |
108 | unsigned int in_hlist_search; | |
109 | unsigned int out_hlist_search; | |
110 | }; | |
111 | ||
7d720c3e | 112 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
113 | |
114 | struct in_device; | |
115 | extern int ip_rt_init(void); | |
f7655229 AV |
116 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
117 | __be32 src, struct net_device *dev); | |
76e6ebfb | 118 | extern void rt_cache_flush(struct net *net, int how); |
6561a3b1 | 119 | extern void rt_cache_flush_batch(struct net *net); |
611c183e | 120 | extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); |
f206351a | 121 | extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); |
f1b050bf | 122 | extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); |
407eadd9 ED |
123 | |
124 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, | |
125 | u8 tos, struct net_device *devin, bool noref); | |
126 | ||
127 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
128 | u8 tos, struct net_device *devin) | |
129 | { | |
130 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
131 | } | |
132 | ||
133 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
134 | u8 tos, struct net_device *devin) | |
135 | { | |
136 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
137 | } | |
138 | ||
0010e465 | 139 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
140 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
141 | ||
6b175b26 EB |
142 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
143 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 144 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 145 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
146 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
147 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
148 | ||
0ff60a45 JHS |
149 | struct in_ifaddr; |
150 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
151 | ||
1da177e4 LT |
152 | static inline void ip_rt_put(struct rtable * rt) |
153 | { | |
154 | if (rt) | |
d8d1f30b | 155 | dst_release(&rt->dst); |
1da177e4 LT |
156 | } |
157 | ||
158 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
159 | ||
4839c52b | 160 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
161 | |
162 | static inline char rt_tos2priority(u8 tos) | |
163 | { | |
164 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
165 | } | |
166 | ||
bada8adc AV |
167 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, |
168 | __be32 src, u32 tos, int oif, u8 protocol, | |
8eb9086f DM |
169 | __be16 sport, __be16 dport, struct sock *sk, |
170 | int flags) | |
1da177e4 LT |
171 | { |
172 | struct flowi fl = { .oif = oif, | |
4a19ec58 | 173 | .mark = sk->sk_mark, |
5811662b CG |
174 | .fl4_dst = dst, |
175 | .fl4_src = src, | |
176 | .fl4_tos = tos, | |
1da177e4 | 177 | .proto = protocol, |
5811662b CG |
178 | .fl_ip_sport = sport, |
179 | .fl_ip_dport = dport }; | |
1da177e4 | 180 | int err; |
3b1e0a65 | 181 | struct net *net = sock_net(sk); |
79876874 KK |
182 | |
183 | if (inet_sk(sk)->transparent) | |
184 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
185 | ||
1da177e4 | 186 | if (!dst || !src) { |
eee80592 | 187 | err = __ip_route_output_key(net, rp, &fl); |
1da177e4 LT |
188 | if (err) |
189 | return err; | |
190 | fl.fl4_dst = (*rp)->rt_dst; | |
191 | fl.fl4_src = (*rp)->rt_src; | |
192 | ip_rt_put(*rp); | |
193 | *rp = NULL; | |
194 | } | |
beb8d13b | 195 | security_sk_classify_flow(sk, &fl); |
eee80592 | 196 | return ip_route_output_flow(net, rp, &fl, sk, flags); |
1da177e4 LT |
197 | } |
198 | ||
5d39a795 | 199 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
39dccd9d | 200 | __be16 sport, __be16 dport, struct sock *sk) |
1da177e4 LT |
201 | { |
202 | if (sport != (*rp)->fl.fl_ip_sport || | |
203 | dport != (*rp)->fl.fl_ip_dport) { | |
204 | struct flowi fl; | |
205 | ||
206 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
207 | fl.fl_ip_sport = sport; | |
208 | fl.fl_ip_dport = dport; | |
5d39a795 | 209 | fl.proto = protocol; |
fb0c5f0b UW |
210 | if (inet_sk(sk)->transparent) |
211 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
1da177e4 LT |
212 | ip_rt_put(*rp); |
213 | *rp = NULL; | |
beb8d13b | 214 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 215 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); |
1da177e4 LT |
216 | } |
217 | return 0; | |
218 | } | |
219 | ||
220 | extern void rt_bind_peer(struct rtable *rt, int create); | |
221 | ||
222 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
223 | { | |
224 | if (rt->peer) | |
225 | return rt->peer; | |
226 | ||
227 | rt_bind_peer(rt, 0); | |
228 | return rt->peer; | |
229 | } | |
230 | ||
1668e010 KK |
231 | static inline int inet_iif(const struct sk_buff *skb) |
232 | { | |
511c3f92 | 233 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
234 | } |
235 | ||
323e126f DM |
236 | extern int sysctl_ip_default_ttl; |
237 | ||
238 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
239 | { | |
240 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
241 | ||
242 | if (hoplimit == 0) | |
243 | hoplimit = sysctl_ip_default_ttl; | |
244 | return hoplimit; | |
245 | } | |
246 | ||
1da177e4 | 247 | #endif /* _ROUTE_H */ |