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 */ |
6431cbc2 | 72 | u32 rt_peer_genid; |
1da177e4 | 73 | struct inet_peer *peer; /* long-living peer info */ |
62fa8a84 | 74 | struct fib_info *fi; /* for client ref to shared metrics */ |
1da177e4 LT |
75 | }; |
76 | ||
c7537967 DM |
77 | static inline bool rt_is_input_route(struct rtable *rt) |
78 | { | |
79 | return rt->fl.iif != 0; | |
80 | } | |
81 | ||
82 | static inline bool rt_is_output_route(struct rtable *rt) | |
83 | { | |
84 | return rt->fl.iif == 0; | |
85 | } | |
86 | ||
fd2c3ef7 | 87 | struct ip_rt_acct { |
1da177e4 LT |
88 | __u32 o_bytes; |
89 | __u32 o_packets; | |
90 | __u32 i_bytes; | |
91 | __u32 i_packets; | |
92 | }; | |
93 | ||
fd2c3ef7 | 94 | struct rt_cache_stat { |
1da177e4 LT |
95 | unsigned int in_hit; |
96 | unsigned int in_slow_tot; | |
97 | unsigned int in_slow_mc; | |
98 | unsigned int in_no_route; | |
99 | unsigned int in_brd; | |
100 | unsigned int in_martian_dst; | |
101 | unsigned int in_martian_src; | |
102 | unsigned int out_hit; | |
103 | unsigned int out_slow_tot; | |
104 | unsigned int out_slow_mc; | |
105 | unsigned int gc_total; | |
106 | unsigned int gc_ignored; | |
107 | unsigned int gc_goal_miss; | |
108 | unsigned int gc_dst_overflow; | |
109 | unsigned int in_hlist_search; | |
110 | unsigned int out_hlist_search; | |
111 | }; | |
112 | ||
7d720c3e | 113 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
114 | |
115 | struct in_device; | |
116 | extern int ip_rt_init(void); | |
f7655229 AV |
117 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
118 | __be32 src, struct net_device *dev); | |
76e6ebfb | 119 | extern void rt_cache_flush(struct net *net, int how); |
6561a3b1 | 120 | extern void rt_cache_flush_batch(struct net *net); |
b23dd4fe DM |
121 | extern struct rtable *__ip_route_output_key(struct net *, const struct flowi *flp); |
122 | extern struct rtable *ip_route_output_key(struct net *, struct flowi *flp); | |
123 | extern struct rtable *ip_route_output_flow(struct net *, struct flowi *flp, | |
124 | struct sock *sk); | |
2774c131 | 125 | extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig); |
407eadd9 ED |
126 | |
127 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, | |
128 | u8 tos, struct net_device *devin, bool noref); | |
129 | ||
130 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
131 | u8 tos, struct net_device *devin) | |
132 | { | |
133 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
134 | } | |
135 | ||
136 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
137 | u8 tos, struct net_device *devin) | |
138 | { | |
139 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
140 | } | |
141 | ||
0010e465 | 142 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
143 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
144 | ||
6b175b26 EB |
145 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
146 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 147 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 148 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
149 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
150 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
151 | ||
0ff60a45 JHS |
152 | struct in_ifaddr; |
153 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
154 | ||
1da177e4 LT |
155 | static inline void ip_rt_put(struct rtable * rt) |
156 | { | |
157 | if (rt) | |
d8d1f30b | 158 | dst_release(&rt->dst); |
1da177e4 LT |
159 | } |
160 | ||
161 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
162 | ||
4839c52b | 163 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
164 | |
165 | static inline char rt_tos2priority(u8 tos) | |
166 | { | |
167 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
168 | } | |
169 | ||
b23dd4fe DM |
170 | static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos, |
171 | int oif, u8 protocol, | |
172 | __be16 sport, __be16 dport, | |
173 | struct sock *sk, bool can_sleep) | |
1da177e4 LT |
174 | { |
175 | struct flowi fl = { .oif = oif, | |
4a19ec58 | 176 | .mark = sk->sk_mark, |
5811662b CG |
177 | .fl4_dst = dst, |
178 | .fl4_src = src, | |
179 | .fl4_tos = tos, | |
1da177e4 | 180 | .proto = protocol, |
5811662b CG |
181 | .fl_ip_sport = sport, |
182 | .fl_ip_dport = dport }; | |
3b1e0a65 | 183 | struct net *net = sock_net(sk); |
b23dd4fe | 184 | struct rtable *rt; |
79876874 KK |
185 | |
186 | if (inet_sk(sk)->transparent) | |
187 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
a4daad6b DM |
188 | if (protocol == IPPROTO_TCP) |
189 | fl.flags |= FLOWI_FLAG_PRECOW_METRICS; | |
5df65e55 DM |
190 | if (can_sleep) |
191 | fl.flags |= FLOWI_FLAG_CAN_SLEEP; | |
79876874 | 192 | |
1da177e4 | 193 | if (!dst || !src) { |
b23dd4fe DM |
194 | rt = __ip_route_output_key(net, &fl); |
195 | if (IS_ERR(rt)) | |
196 | return rt; | |
197 | fl.fl4_dst = rt->rt_dst; | |
198 | fl.fl4_src = rt->rt_src; | |
199 | ip_rt_put(rt); | |
1da177e4 | 200 | } |
beb8d13b | 201 | security_sk_classify_flow(sk, &fl); |
b23dd4fe | 202 | return ip_route_output_flow(net, &fl, sk); |
1da177e4 LT |
203 | } |
204 | ||
b23dd4fe DM |
205 | static inline struct rtable *ip_route_newports(struct rtable *rt, |
206 | u8 protocol, __be16 orig_sport, | |
207 | __be16 orig_dport, __be16 sport, | |
208 | __be16 dport, struct sock *sk) | |
1da177e4 | 209 | { |
dca8b089 | 210 | if (sport != orig_sport || dport != orig_dport) { |
b23dd4fe DM |
211 | struct flowi fl = { .oif = rt->fl.oif, |
212 | .mark = rt->fl.mark, | |
213 | .fl4_dst = rt->fl.fl4_dst, | |
214 | .fl4_src = rt->fl.fl4_src, | |
215 | .fl4_tos = rt->fl.fl4_tos, | |
216 | .proto = rt->fl.proto, | |
dca8b089 DM |
217 | .fl_ip_sport = sport, |
218 | .fl_ip_dport = dport }; | |
219 | ||
fb0c5f0b UW |
220 | if (inet_sk(sk)->transparent) |
221 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
a4daad6b DM |
222 | if (protocol == IPPROTO_TCP) |
223 | fl.flags |= FLOWI_FLAG_PRECOW_METRICS; | |
b23dd4fe | 224 | ip_rt_put(rt); |
beb8d13b | 225 | security_sk_classify_flow(sk, &fl); |
b23dd4fe | 226 | return ip_route_output_flow(sock_net(sk), &fl, sk); |
1da177e4 | 227 | } |
b23dd4fe | 228 | return rt; |
1da177e4 LT |
229 | } |
230 | ||
231 | extern void rt_bind_peer(struct rtable *rt, int create); | |
232 | ||
233 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
234 | { | |
235 | if (rt->peer) | |
236 | return rt->peer; | |
237 | ||
238 | rt_bind_peer(rt, 0); | |
239 | return rt->peer; | |
240 | } | |
241 | ||
1668e010 KK |
242 | static inline int inet_iif(const struct sk_buff *skb) |
243 | { | |
511c3f92 | 244 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
245 | } |
246 | ||
323e126f DM |
247 | extern int sysctl_ip_default_ttl; |
248 | ||
249 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
250 | { | |
251 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
252 | ||
253 | if (hoplimit == 0) | |
254 | hoplimit = sysctl_ip_default_ttl; | |
255 | return hoplimit; | |
256 | } | |
257 | ||
1da177e4 | 258 | #endif /* _ROUTE_H */ |