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> | |
c6cffba4 | 33 | #include <linux/rcupdate.h> |
1da177e4 LT |
34 | #include <linux/route.h> |
35 | #include <linux/ip.h> | |
36 | #include <linux/cache.h> | |
beb8d13b | 37 | #include <linux/security.h> |
1da177e4 | 38 | |
1da177e4 LT |
39 | #define RTO_ONLINK 0x01 |
40 | ||
1da177e4 | 41 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
aa661581 | 42 | #define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
1da177e4 LT |
43 | |
44 | struct fib_nh; | |
62fa8a84 | 45 | struct fib_info; |
fd2c3ef7 | 46 | struct rtable { |
d8d1f30b | 47 | struct dst_entry dst; |
1da177e4 | 48 | |
29e75252 | 49 | int rt_genid; |
95c96174 | 50 | unsigned int rt_flags; |
1da177e4 | 51 | __u16 rt_type; |
155e8336 JA |
52 | __u8 rt_is_input; |
53 | __u8 rt_uses_gateway; | |
1da177e4 | 54 | |
1da177e4 LT |
55 | int rt_iif; |
56 | ||
57 | /* Info on neighbour */ | |
f2c3fe24 | 58 | __be32 rt_gateway; |
1da177e4 | 59 | |
1da177e4 | 60 | /* Miscellaneous cached information */ |
5943634f | 61 | u32 rt_pmtu; |
caacf05e DM |
62 | |
63 | struct list_head rt_uncached; | |
1da177e4 LT |
64 | }; |
65 | ||
b8400f37 | 66 | static inline bool rt_is_input_route(const struct rtable *rt) |
c7537967 | 67 | { |
9917e1e8 | 68 | return rt->rt_is_input != 0; |
c7537967 DM |
69 | } |
70 | ||
b8400f37 | 71 | static inline bool rt_is_output_route(const struct rtable *rt) |
c7537967 | 72 | { |
9917e1e8 | 73 | return rt->rt_is_input == 0; |
c7537967 DM |
74 | } |
75 | ||
f8126f1d DM |
76 | static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr) |
77 | { | |
78 | if (rt->rt_gateway) | |
79 | return rt->rt_gateway; | |
80 | return daddr; | |
81 | } | |
82 | ||
fd2c3ef7 | 83 | struct ip_rt_acct { |
1da177e4 LT |
84 | __u32 o_bytes; |
85 | __u32 o_packets; | |
86 | __u32 i_bytes; | |
87 | __u32 i_packets; | |
88 | }; | |
89 | ||
fd2c3ef7 | 90 | struct rt_cache_stat { |
1da177e4 LT |
91 | unsigned int in_slow_tot; |
92 | unsigned int in_slow_mc; | |
93 | unsigned int in_no_route; | |
94 | unsigned int in_brd; | |
95 | unsigned int in_martian_dst; | |
96 | unsigned int in_martian_src; | |
1da177e4 LT |
97 | unsigned int out_slow_tot; |
98 | unsigned int out_slow_mc; | |
1da177e4 LT |
99 | }; |
100 | ||
7d720c3e | 101 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
102 | |
103 | struct in_device; | |
2702c4bb JP |
104 | |
105 | int ip_rt_init(void); | |
106 | void rt_cache_flush(struct net *net); | |
107 | void rt_flush_dev(struct net_device *dev); | |
108 | struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp); | |
109 | struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, | |
110 | struct sock *sk); | |
111 | struct dst_entry *ipv4_blackhole_route(struct net *net, | |
112 | struct dst_entry *dst_orig); | |
407eadd9 | 113 | |
9d6ec938 | 114 | static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) |
5bfa787f DM |
115 | { |
116 | return ip_route_output_flow(net, flp, NULL); | |
117 | } | |
118 | ||
78fbfd8a DM |
119 | static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, |
120 | __be32 saddr, u8 tos, int oif) | |
121 | { | |
9d6ec938 DM |
122 | struct flowi4 fl4 = { |
123 | .flowi4_oif = oif, | |
c5d21c4b | 124 | .flowi4_tos = tos, |
9d6ec938 DM |
125 | .daddr = daddr, |
126 | .saddr = saddr, | |
78fbfd8a | 127 | }; |
9d6ec938 | 128 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
129 | } |
130 | ||
31e4543d DM |
131 | static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4, |
132 | struct sock *sk, | |
78fbfd8a DM |
133 | __be32 daddr, __be32 saddr, |
134 | __be16 dport, __be16 sport, | |
135 | __u8 proto, __u8 tos, int oif) | |
136 | { | |
31e4543d | 137 | flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos, |
94b92b88 DM |
138 | RT_SCOPE_UNIVERSE, proto, |
139 | sk ? inet_sk_flowi_flags(sk) : 0, | |
140 | daddr, saddr, dport, sport); | |
78fbfd8a | 141 | if (sk) |
31e4543d DM |
142 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
143 | return ip_route_output_flow(net, fl4, sk); | |
78fbfd8a DM |
144 | } |
145 | ||
cbb1e85f | 146 | static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4, |
78fbfd8a DM |
147 | __be32 daddr, __be32 saddr, |
148 | __be32 gre_key, __u8 tos, int oif) | |
149 | { | |
cbb1e85f DM |
150 | memset(fl4, 0, sizeof(*fl4)); |
151 | fl4->flowi4_oif = oif; | |
152 | fl4->daddr = daddr; | |
153 | fl4->saddr = saddr; | |
154 | fl4->flowi4_tos = tos; | |
155 | fl4->flowi4_proto = IPPROTO_GRE; | |
156 | fl4->fl4_gre_key = gre_key; | |
157 | return ip_route_output_key(net, fl4); | |
78fbfd8a DM |
158 | } |
159 | ||
2702c4bb JP |
160 | int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, |
161 | u8 tos, struct net_device *devin); | |
c6cffba4 DM |
162 | |
163 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
164 | u8 tos, struct net_device *devin) | |
165 | { | |
166 | int err; | |
167 | ||
168 | rcu_read_lock(); | |
169 | err = ip_route_input_noref(skb, dst, src, tos, devin); | |
170 | if (!err) | |
171 | skb_dst_force(skb); | |
172 | rcu_read_unlock(); | |
173 | ||
174 | return err; | |
175 | } | |
407eadd9 | 176 | |
2702c4bb JP |
177 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif, |
178 | u32 mark, u8 protocol, int flow_flags); | |
179 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu); | |
180 | void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, | |
181 | u8 protocol, int flow_flags); | |
182 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk); | |
183 | void ip_rt_send_redirect(struct sk_buff *skb); | |
184 | ||
185 | unsigned int inet_addr_type(struct net *net, __be32 addr); | |
186 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, | |
187 | __be32 addr); | |
188 | void ip_rt_multicast_event(struct in_device *); | |
189 | int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); | |
190 | void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt); | |
191 | int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
1da177e4 | 192 | |
0ff60a45 | 193 | struct in_ifaddr; |
2702c4bb JP |
194 | void fib_add_ifaddr(struct in_ifaddr *); |
195 | void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); | |
0ff60a45 | 196 | |
6da025fa | 197 | static inline void ip_rt_put(struct rtable *rt) |
1da177e4 | 198 | { |
6da025fa ED |
199 | /* dst_release() accepts a NULL parameter. |
200 | * We rely on dst being first structure in struct rtable | |
201 | */ | |
202 | BUILD_BUG_ON(offsetof(struct rtable, dst) != 0); | |
203 | dst_release(&rt->dst); | |
1da177e4 LT |
204 | } |
205 | ||
206 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
207 | ||
4839c52b | 208 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
209 | |
210 | static inline char rt_tos2priority(u8 tos) | |
211 | { | |
212 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
213 | } | |
214 | ||
2d7192d6 DM |
215 | /* ip_route_connect() and ip_route_newports() work in tandem whilst |
216 | * binding a socket for a new outgoing connection. | |
217 | * | |
218 | * In order to use IPSEC properly, we must, in the end, have a | |
219 | * route that was looked up using all available keys including source | |
220 | * and destination ports. | |
221 | * | |
222 | * However, if a source port needs to be allocated (the user specified | |
223 | * a wildcard source port) we need to obtain addressing information | |
224 | * in order to perform that allocation. | |
225 | * | |
226 | * So ip_route_connect() looks up a route using wildcarded source and | |
227 | * destination ports in the key, simply so that we can get a pair of | |
228 | * addresses to use for port allocation. | |
229 | * | |
230 | * Later, once the ports are allocated, ip_route_newports() will make | |
231 | * another route lookup if needed to make sure we catch any IPSEC | |
232 | * rules keyed on the port information. | |
233 | * | |
234 | * The callers allocate the flow key on their stack, and must pass in | |
235 | * the same flowi4 object to both the ip_route_connect() and the | |
236 | * ip_route_newports() calls. | |
237 | */ | |
238 | ||
239 | static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, | |
240 | u32 tos, int oif, u8 protocol, | |
241 | __be16 sport, __be16 dport, | |
0e0d44ab | 242 | struct sock *sk) |
1da177e4 | 243 | { |
2d7192d6 | 244 | __u8 flow_flags = 0; |
79876874 KK |
245 | |
246 | if (inet_sk(sk)->transparent) | |
94b92b88 | 247 | flow_flags |= FLOWI_FLAG_ANYSRC; |
94b92b88 | 248 | |
2d7192d6 | 249 | flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, |
94b92b88 | 250 | protocol, flow_flags, dst, src, dport, sport); |
2d7192d6 DM |
251 | } |
252 | ||
253 | static inline struct rtable *ip_route_connect(struct flowi4 *fl4, | |
254 | __be32 dst, __be32 src, u32 tos, | |
255 | int oif, u8 protocol, | |
256 | __be16 sport, __be16 dport, | |
0e0d44ab | 257 | struct sock *sk) |
2d7192d6 DM |
258 | { |
259 | struct net *net = sock_net(sk); | |
260 | struct rtable *rt; | |
261 | ||
262 | ip_route_connect_init(fl4, dst, src, tos, oif, protocol, | |
0e0d44ab | 263 | sport, dport, sk); |
79876874 | 264 | |
1da177e4 | 265 | if (!dst || !src) { |
2d7192d6 | 266 | rt = __ip_route_output_key(net, fl4); |
b23dd4fe DM |
267 | if (IS_ERR(rt)) |
268 | return rt; | |
b23dd4fe | 269 | ip_rt_put(rt); |
e6b45241 | 270 | flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr); |
1da177e4 | 271 | } |
2d7192d6 DM |
272 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
273 | return ip_route_output_flow(net, fl4, sk); | |
1da177e4 LT |
274 | } |
275 | ||
2d7192d6 DM |
276 | static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, |
277 | __be16 orig_sport, __be16 orig_dport, | |
278 | __be16 sport, __be16 dport, | |
279 | struct sock *sk) | |
1da177e4 | 280 | { |
dca8b089 | 281 | if (sport != orig_sport || dport != orig_dport) { |
2d7192d6 DM |
282 | fl4->fl4_dport = dport; |
283 | fl4->fl4_sport = sport; | |
b23dd4fe | 284 | ip_rt_put(rt); |
e6b45241 JA |
285 | flowi4_update_output(fl4, sk->sk_bound_dev_if, |
286 | RT_CONN_FLAGS(sk), fl4->daddr, | |
287 | fl4->saddr); | |
2d7192d6 DM |
288 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
289 | return ip_route_output_flow(sock_net(sk), fl4, sk); | |
1da177e4 | 290 | } |
b23dd4fe | 291 | return rt; |
1da177e4 LT |
292 | } |
293 | ||
1668e010 KK |
294 | static inline int inet_iif(const struct sk_buff *skb) |
295 | { | |
13378cad DM |
296 | int iif = skb_rtable(skb)->rt_iif; |
297 | ||
298 | if (iif) | |
299 | return iif; | |
300 | return skb->skb_iif; | |
1668e010 KK |
301 | } |
302 | ||
323e126f DM |
303 | extern int sysctl_ip_default_ttl; |
304 | ||
305 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
306 | { | |
307 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
308 | ||
309 | if (hoplimit == 0) | |
310 | hoplimit = sysctl_ip_default_ttl; | |
311 | return hoplimit; | |
312 | } | |
313 | ||
482fc609 | 314 | static inline bool ip_sk_accept_pmtu(const struct sock *sk) |
0ea9d5e3 | 315 | { |
482fc609 HFS |
316 | return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE; |
317 | } | |
0ea9d5e3 | 318 | |
482fc609 HFS |
319 | static inline bool ip_sk_use_pmtu(const struct sock *sk) |
320 | { | |
321 | return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; | |
322 | } | |
323 | ||
324 | static inline int ip_skb_dst_mtu(const struct sk_buff *skb) | |
325 | { | |
326 | return (!skb->sk || ip_sk_use_pmtu(skb->sk)) ? | |
327 | dst_mtu(skb_dst(skb)) : skb_dst(skb)->dev->mtu; | |
0ea9d5e3 HFS |
328 | } |
329 | ||
1da177e4 | 330 | #endif /* _ROUTE_H */ |