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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 | 37 | |
1da177e4 LT |
38 | #define RTO_ONLINK 0x01 |
39 | ||
1da177e4 LT |
40 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
41 | ||
42 | struct fib_nh; | |
43 | struct inet_peer; | |
62fa8a84 | 44 | struct fib_info; |
fd2c3ef7 | 45 | struct rtable { |
d8d1f30b | 46 | struct dst_entry dst; |
1da177e4 | 47 | |
5e2b61f7 DM |
48 | /* Lookup key. */ |
49 | __be32 rt_key_dst; | |
50 | __be32 rt_key_src; | |
093c2ca4 | 51 | |
29e75252 | 52 | int rt_genid; |
1da177e4 LT |
53 | unsigned rt_flags; |
54 | __u16 rt_type; | |
475949d8 | 55 | __u8 rt_key_tos; |
1da177e4 | 56 | |
f2c3fe24 AV |
57 | __be32 rt_dst; /* Path destination */ |
58 | __be32 rt_src; /* Path source */ | |
1b86a58f | 59 | int rt_route_iif; |
1da177e4 | 60 | int rt_iif; |
5e2b61f7 DM |
61 | int rt_oif; |
62 | __u32 rt_mark; | |
1da177e4 LT |
63 | |
64 | /* Info on neighbour */ | |
f2c3fe24 | 65 | __be32 rt_gateway; |
1da177e4 | 66 | |
1da177e4 | 67 | /* Miscellaneous cached information */ |
f2c3fe24 | 68 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
6431cbc2 | 69 | u32 rt_peer_genid; |
1da177e4 | 70 | struct inet_peer *peer; /* long-living peer info */ |
62fa8a84 | 71 | struct fib_info *fi; /* for client ref to shared metrics */ |
1da177e4 LT |
72 | }; |
73 | ||
c7537967 DM |
74 | static inline bool rt_is_input_route(struct rtable *rt) |
75 | { | |
1b86a58f | 76 | return rt->rt_route_iif != 0; |
c7537967 DM |
77 | } |
78 | ||
79 | static inline bool rt_is_output_route(struct rtable *rt) | |
80 | { | |
1b86a58f | 81 | return rt->rt_route_iif == 0; |
c7537967 DM |
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); |
6561a3b1 | 117 | extern void rt_cache_flush_batch(struct net *net); |
813b3b5d | 118 | extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp); |
9d6ec938 | 119 | extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, |
b23dd4fe | 120 | struct sock *sk); |
2774c131 | 121 | extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig); |
407eadd9 | 122 | |
9d6ec938 | 123 | static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) |
5bfa787f DM |
124 | { |
125 | return ip_route_output_flow(net, flp, NULL); | |
126 | } | |
127 | ||
78fbfd8a DM |
128 | static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, |
129 | __be32 saddr, u8 tos, int oif) | |
130 | { | |
9d6ec938 DM |
131 | struct flowi4 fl4 = { |
132 | .flowi4_oif = oif, | |
133 | .daddr = daddr, | |
134 | .saddr = saddr, | |
135 | .flowi4_tos = tos, | |
78fbfd8a | 136 | }; |
9d6ec938 | 137 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
138 | } |
139 | ||
140 | static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk, | |
141 | __be32 daddr, __be32 saddr, | |
142 | __be16 dport, __be16 sport, | |
143 | __u8 proto, __u8 tos, int oif) | |
144 | { | |
94b92b88 DM |
145 | struct flowi4 fl4; |
146 | ||
147 | flowi4_init_output(&fl4, oif, sk ? sk->sk_mark : 0, tos, | |
148 | RT_SCOPE_UNIVERSE, proto, | |
149 | sk ? inet_sk_flowi_flags(sk) : 0, | |
150 | daddr, saddr, dport, sport); | |
78fbfd8a | 151 | if (sk) |
9d6ec938 DM |
152 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
153 | return ip_route_output_flow(net, &fl4, sk); | |
78fbfd8a DM |
154 | } |
155 | ||
156 | static inline struct rtable *ip_route_output_gre(struct net *net, | |
157 | __be32 daddr, __be32 saddr, | |
158 | __be32 gre_key, __u8 tos, int oif) | |
159 | { | |
9d6ec938 DM |
160 | struct flowi4 fl4 = { |
161 | .flowi4_oif = oif, | |
162 | .daddr = daddr, | |
163 | .saddr = saddr, | |
164 | .flowi4_tos = tos, | |
165 | .flowi4_proto = IPPROTO_GRE, | |
9cce96df | 166 | .fl4_gre_key = gre_key, |
78fbfd8a | 167 | }; |
9d6ec938 | 168 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
169 | } |
170 | ||
407eadd9 ED |
171 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, |
172 | u8 tos, struct net_device *devin, bool noref); | |
173 | ||
174 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
175 | u8 tos, struct net_device *devin) | |
176 | { | |
177 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
178 | } | |
179 | ||
180 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
181 | u8 tos, struct net_device *devin) | |
182 | { | |
183 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
184 | } | |
185 | ||
b71d1d42 ED |
186 | extern unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph, |
187 | unsigned short new_mtu, struct net_device *dev); | |
1da177e4 LT |
188 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
189 | ||
6b175b26 EB |
190 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
191 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 192 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 193 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
194 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
195 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
196 | ||
0ff60a45 JHS |
197 | struct in_ifaddr; |
198 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
e6abbaa2 | 199 | extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); |
0ff60a45 | 200 | |
1da177e4 LT |
201 | static inline void ip_rt_put(struct rtable * rt) |
202 | { | |
203 | if (rt) | |
d8d1f30b | 204 | dst_release(&rt->dst); |
1da177e4 LT |
205 | } |
206 | ||
207 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
208 | ||
4839c52b | 209 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
210 | |
211 | static inline char rt_tos2priority(u8 tos) | |
212 | { | |
213 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
214 | } | |
215 | ||
2d7192d6 DM |
216 | /* ip_route_connect() and ip_route_newports() work in tandem whilst |
217 | * binding a socket for a new outgoing connection. | |
218 | * | |
219 | * In order to use IPSEC properly, we must, in the end, have a | |
220 | * route that was looked up using all available keys including source | |
221 | * and destination ports. | |
222 | * | |
223 | * However, if a source port needs to be allocated (the user specified | |
224 | * a wildcard source port) we need to obtain addressing information | |
225 | * in order to perform that allocation. | |
226 | * | |
227 | * So ip_route_connect() looks up a route using wildcarded source and | |
228 | * destination ports in the key, simply so that we can get a pair of | |
229 | * addresses to use for port allocation. | |
230 | * | |
231 | * Later, once the ports are allocated, ip_route_newports() will make | |
232 | * another route lookup if needed to make sure we catch any IPSEC | |
233 | * rules keyed on the port information. | |
234 | * | |
235 | * The callers allocate the flow key on their stack, and must pass in | |
236 | * the same flowi4 object to both the ip_route_connect() and the | |
237 | * ip_route_newports() calls. | |
238 | */ | |
239 | ||
240 | static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, | |
241 | u32 tos, int oif, u8 protocol, | |
242 | __be16 sport, __be16 dport, | |
243 | struct sock *sk, bool can_sleep) | |
1da177e4 | 244 | { |
2d7192d6 | 245 | __u8 flow_flags = 0; |
79876874 KK |
246 | |
247 | if (inet_sk(sk)->transparent) | |
94b92b88 | 248 | flow_flags |= FLOWI_FLAG_ANYSRC; |
a4daad6b | 249 | if (protocol == IPPROTO_TCP) |
94b92b88 | 250 | flow_flags |= FLOWI_FLAG_PRECOW_METRICS; |
5df65e55 | 251 | if (can_sleep) |
94b92b88 DM |
252 | flow_flags |= FLOWI_FLAG_CAN_SLEEP; |
253 | ||
2d7192d6 | 254 | flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, |
94b92b88 | 255 | protocol, flow_flags, dst, src, dport, sport); |
2d7192d6 DM |
256 | } |
257 | ||
258 | static inline struct rtable *ip_route_connect(struct flowi4 *fl4, | |
259 | __be32 dst, __be32 src, u32 tos, | |
260 | int oif, u8 protocol, | |
261 | __be16 sport, __be16 dport, | |
262 | struct sock *sk, bool can_sleep) | |
263 | { | |
264 | struct net *net = sock_net(sk); | |
265 | struct rtable *rt; | |
266 | ||
267 | ip_route_connect_init(fl4, dst, src, tos, oif, protocol, | |
268 | sport, dport, sk, can_sleep); | |
79876874 | 269 | |
1da177e4 | 270 | if (!dst || !src) { |
2d7192d6 | 271 | rt = __ip_route_output_key(net, fl4); |
b23dd4fe DM |
272 | if (IS_ERR(rt)) |
273 | return rt; | |
b23dd4fe | 274 | ip_rt_put(rt); |
1da177e4 | 275 | } |
2d7192d6 DM |
276 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
277 | return ip_route_output_flow(net, fl4, sk); | |
1da177e4 LT |
278 | } |
279 | ||
2d7192d6 DM |
280 | static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, |
281 | __be16 orig_sport, __be16 orig_dport, | |
282 | __be16 sport, __be16 dport, | |
283 | struct sock *sk) | |
1da177e4 | 284 | { |
dca8b089 | 285 | if (sport != orig_sport || dport != orig_dport) { |
2d7192d6 DM |
286 | fl4->fl4_dport = dport; |
287 | fl4->fl4_sport = sport; | |
b23dd4fe | 288 | ip_rt_put(rt); |
2d7192d6 DM |
289 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
290 | return ip_route_output_flow(sock_net(sk), fl4, sk); | |
1da177e4 | 291 | } |
b23dd4fe | 292 | return rt; |
1da177e4 LT |
293 | } |
294 | ||
295 | extern void rt_bind_peer(struct rtable *rt, int create); | |
296 | ||
297 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
298 | { | |
299 | if (rt->peer) | |
300 | return rt->peer; | |
301 | ||
302 | rt_bind_peer(rt, 0); | |
303 | return rt->peer; | |
304 | } | |
305 | ||
1668e010 KK |
306 | static inline int inet_iif(const struct sk_buff *skb) |
307 | { | |
511c3f92 | 308 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
309 | } |
310 | ||
323e126f DM |
311 | extern int sysctl_ip_default_ttl; |
312 | ||
313 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
314 | { | |
315 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
316 | ||
317 | if (hoplimit == 0) | |
318 | hoplimit = sysctl_ip_default_ttl; | |
319 | return hoplimit; | |
320 | } | |
321 | ||
1da177e4 | 322 | #endif /* _ROUTE_H */ |