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 | |
5e2b61f7 DM |
56 | /* Lookup key. */ |
57 | __be32 rt_key_dst; | |
58 | __be32 rt_key_src; | |
093c2ca4 | 59 | |
29e75252 | 60 | int rt_genid; |
1da177e4 LT |
61 | unsigned rt_flags; |
62 | __u16 rt_type; | |
5e2b61f7 | 63 | __u8 rt_tos; |
1da177e4 | 64 | |
f2c3fe24 AV |
65 | __be32 rt_dst; /* Path destination */ |
66 | __be32 rt_src; /* Path source */ | |
1da177e4 | 67 | int rt_iif; |
5e2b61f7 DM |
68 | int rt_oif; |
69 | __u32 rt_mark; | |
1da177e4 LT |
70 | |
71 | /* Info on neighbour */ | |
f2c3fe24 | 72 | __be32 rt_gateway; |
1da177e4 | 73 | |
1da177e4 | 74 | /* Miscellaneous cached information */ |
f2c3fe24 | 75 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
6431cbc2 | 76 | u32 rt_peer_genid; |
1da177e4 | 77 | struct inet_peer *peer; /* long-living peer info */ |
62fa8a84 | 78 | struct fib_info *fi; /* for client ref to shared metrics */ |
1da177e4 LT |
79 | }; |
80 | ||
c7537967 DM |
81 | static inline bool rt_is_input_route(struct rtable *rt) |
82 | { | |
5e2b61f7 | 83 | return rt->rt_iif != 0; |
c7537967 DM |
84 | } |
85 | ||
86 | static inline bool rt_is_output_route(struct rtable *rt) | |
87 | { | |
5e2b61f7 | 88 | return rt->rt_iif == 0; |
c7537967 DM |
89 | } |
90 | ||
fd2c3ef7 | 91 | struct ip_rt_acct { |
1da177e4 LT |
92 | __u32 o_bytes; |
93 | __u32 o_packets; | |
94 | __u32 i_bytes; | |
95 | __u32 i_packets; | |
96 | }; | |
97 | ||
fd2c3ef7 | 98 | struct rt_cache_stat { |
1da177e4 LT |
99 | unsigned int in_hit; |
100 | unsigned int in_slow_tot; | |
101 | unsigned int in_slow_mc; | |
102 | unsigned int in_no_route; | |
103 | unsigned int in_brd; | |
104 | unsigned int in_martian_dst; | |
105 | unsigned int in_martian_src; | |
106 | unsigned int out_hit; | |
107 | unsigned int out_slow_tot; | |
108 | unsigned int out_slow_mc; | |
109 | unsigned int gc_total; | |
110 | unsigned int gc_ignored; | |
111 | unsigned int gc_goal_miss; | |
112 | unsigned int gc_dst_overflow; | |
113 | unsigned int in_hlist_search; | |
114 | unsigned int out_hlist_search; | |
115 | }; | |
116 | ||
7d720c3e | 117 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
118 | |
119 | struct in_device; | |
120 | extern int ip_rt_init(void); | |
f7655229 AV |
121 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
122 | __be32 src, struct net_device *dev); | |
76e6ebfb | 123 | extern void rt_cache_flush(struct net *net, int how); |
6561a3b1 | 124 | extern void rt_cache_flush_batch(struct net *net); |
9d6ec938 DM |
125 | extern struct rtable *__ip_route_output_key(struct net *, const struct flowi4 *flp); |
126 | extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, | |
b23dd4fe | 127 | struct sock *sk); |
2774c131 | 128 | extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig); |
407eadd9 | 129 | |
9d6ec938 | 130 | static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) |
5bfa787f DM |
131 | { |
132 | return ip_route_output_flow(net, flp, NULL); | |
133 | } | |
134 | ||
78fbfd8a DM |
135 | static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, |
136 | __be32 saddr, u8 tos, int oif) | |
137 | { | |
9d6ec938 DM |
138 | struct flowi4 fl4 = { |
139 | .flowi4_oif = oif, | |
140 | .daddr = daddr, | |
141 | .saddr = saddr, | |
142 | .flowi4_tos = tos, | |
78fbfd8a | 143 | }; |
9d6ec938 | 144 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
145 | } |
146 | ||
147 | static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk, | |
148 | __be32 daddr, __be32 saddr, | |
149 | __be16 dport, __be16 sport, | |
150 | __u8 proto, __u8 tos, int oif) | |
151 | { | |
9d6ec938 DM |
152 | struct flowi4 fl4 = { |
153 | .flowi4_oif = oif, | |
154 | .flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0, | |
155 | .flowi4_mark = sk ? sk->sk_mark : 0, | |
156 | .daddr = daddr, | |
157 | .saddr = saddr, | |
158 | .flowi4_tos = tos, | |
159 | .flowi4_proto = proto, | |
9cce96df DM |
160 | .fl4_dport = dport, |
161 | .fl4_sport = sport, | |
78fbfd8a DM |
162 | }; |
163 | if (sk) | |
9d6ec938 DM |
164 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
165 | return ip_route_output_flow(net, &fl4, sk); | |
78fbfd8a DM |
166 | } |
167 | ||
168 | static inline struct rtable *ip_route_output_gre(struct net *net, | |
169 | __be32 daddr, __be32 saddr, | |
170 | __be32 gre_key, __u8 tos, int oif) | |
171 | { | |
9d6ec938 DM |
172 | struct flowi4 fl4 = { |
173 | .flowi4_oif = oif, | |
174 | .daddr = daddr, | |
175 | .saddr = saddr, | |
176 | .flowi4_tos = tos, | |
177 | .flowi4_proto = IPPROTO_GRE, | |
9cce96df | 178 | .fl4_gre_key = gre_key, |
78fbfd8a | 179 | }; |
9d6ec938 | 180 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
181 | } |
182 | ||
407eadd9 ED |
183 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, |
184 | u8 tos, struct net_device *devin, bool noref); | |
185 | ||
186 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
187 | u8 tos, struct net_device *devin) | |
188 | { | |
189 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
190 | } | |
191 | ||
192 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
193 | u8 tos, struct net_device *devin) | |
194 | { | |
195 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
196 | } | |
197 | ||
0010e465 | 198 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
199 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
200 | ||
6b175b26 EB |
201 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
202 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 203 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 204 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
205 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
206 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
207 | ||
0ff60a45 JHS |
208 | struct in_ifaddr; |
209 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
e6abbaa2 | 210 | extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); |
0ff60a45 | 211 | |
1da177e4 LT |
212 | static inline void ip_rt_put(struct rtable * rt) |
213 | { | |
214 | if (rt) | |
d8d1f30b | 215 | dst_release(&rt->dst); |
1da177e4 LT |
216 | } |
217 | ||
218 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
219 | ||
4839c52b | 220 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
221 | |
222 | static inline char rt_tos2priority(u8 tos) | |
223 | { | |
224 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
225 | } | |
226 | ||
b23dd4fe DM |
227 | static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos, |
228 | int oif, u8 protocol, | |
229 | __be16 sport, __be16 dport, | |
230 | struct sock *sk, bool can_sleep) | |
1da177e4 | 231 | { |
9d6ec938 DM |
232 | struct flowi4 fl4 = { |
233 | .flowi4_oif = oif, | |
234 | .flowi4_mark = sk->sk_mark, | |
235 | .daddr = dst, | |
236 | .saddr = src, | |
237 | .flowi4_tos = tos, | |
238 | .flowi4_proto = protocol, | |
9cce96df DM |
239 | .fl4_sport = sport, |
240 | .fl4_dport = dport, | |
6281dcc9 | 241 | }; |
3b1e0a65 | 242 | struct net *net = sock_net(sk); |
b23dd4fe | 243 | struct rtable *rt; |
79876874 KK |
244 | |
245 | if (inet_sk(sk)->transparent) | |
9d6ec938 | 246 | fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC; |
a4daad6b | 247 | if (protocol == IPPROTO_TCP) |
9d6ec938 | 248 | fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS; |
5df65e55 | 249 | if (can_sleep) |
9d6ec938 | 250 | fl4.flowi4_flags |= FLOWI_FLAG_CAN_SLEEP; |
79876874 | 251 | |
1da177e4 | 252 | if (!dst || !src) { |
9d6ec938 | 253 | rt = __ip_route_output_key(net, &fl4); |
b23dd4fe DM |
254 | if (IS_ERR(rt)) |
255 | return rt; | |
9d6ec938 DM |
256 | fl4.daddr = rt->rt_dst; |
257 | fl4.saddr = rt->rt_src; | |
b23dd4fe | 258 | ip_rt_put(rt); |
1da177e4 | 259 | } |
9d6ec938 DM |
260 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
261 | return ip_route_output_flow(net, &fl4, sk); | |
1da177e4 LT |
262 | } |
263 | ||
b23dd4fe DM |
264 | static inline struct rtable *ip_route_newports(struct rtable *rt, |
265 | u8 protocol, __be16 orig_sport, | |
266 | __be16 orig_dport, __be16 sport, | |
267 | __be16 dport, struct sock *sk) | |
1da177e4 | 268 | { |
dca8b089 | 269 | if (sport != orig_sport || dport != orig_dport) { |
9d6ec938 DM |
270 | struct flowi4 fl4 = { |
271 | .flowi4_oif = rt->rt_oif, | |
272 | .flowi4_mark = rt->rt_mark, | |
6df59a84 SK |
273 | .daddr = rt->rt_dst, |
274 | .saddr = rt->rt_src, | |
9d6ec938 DM |
275 | .flowi4_tos = rt->rt_tos, |
276 | .flowi4_proto = protocol, | |
9cce96df DM |
277 | .fl4_sport = sport, |
278 | .fl4_dport = dport | |
6281dcc9 | 279 | }; |
fb0c5f0b | 280 | if (inet_sk(sk)->transparent) |
9d6ec938 | 281 | fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC; |
a4daad6b | 282 | if (protocol == IPPROTO_TCP) |
9d6ec938 | 283 | fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS; |
b23dd4fe | 284 | ip_rt_put(rt); |
9d6ec938 DM |
285 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
286 | return ip_route_output_flow(sock_net(sk), &fl4, sk); | |
1da177e4 | 287 | } |
b23dd4fe | 288 | return rt; |
1da177e4 LT |
289 | } |
290 | ||
291 | extern void rt_bind_peer(struct rtable *rt, int create); | |
292 | ||
293 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
294 | { | |
295 | if (rt->peer) | |
296 | return rt->peer; | |
297 | ||
298 | rt_bind_peer(rt, 0); | |
299 | return rt->peer; | |
300 | } | |
301 | ||
1668e010 KK |
302 | static inline int inet_iif(const struct sk_buff *skb) |
303 | { | |
511c3f92 | 304 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
305 | } |
306 | ||
323e126f DM |
307 | extern int sysctl_ip_default_ttl; |
308 | ||
309 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
310 | { | |
311 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
312 | ||
313 | if (hoplimit == 0) | |
314 | hoplimit = sysctl_ip_default_ttl; | |
315 | return hoplimit; | |
316 | } | |
317 | ||
1da177e4 | 318 | #endif /* _ROUTE_H */ |