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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> |
79a13159 | 31 | #include <net/ip_fib.h> |
1da177e4 LT |
32 | #include <linux/in_route.h> |
33 | #include <linux/rtnetlink.h> | |
c6cffba4 | 34 | #include <linux/rcupdate.h> |
1da177e4 LT |
35 | #include <linux/route.h> |
36 | #include <linux/ip.h> | |
37 | #include <linux/cache.h> | |
beb8d13b | 38 | #include <linux/security.h> |
1da177e4 | 39 | |
f87c10a8 HFS |
40 | /* IPv4 datagram length is stored into 16bit field (tot_len) */ |
41 | #define IP_MAX_MTU 0xFFFFU | |
42 | ||
1da177e4 LT |
43 | #define RTO_ONLINK 0x01 |
44 | ||
1da177e4 | 45 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
aa661581 | 46 | #define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE)) |
1da177e4 LT |
47 | |
48 | struct fib_nh; | |
62fa8a84 | 49 | struct fib_info; |
5055c371 | 50 | struct uncached_list; |
fd2c3ef7 | 51 | struct rtable { |
d8d1f30b | 52 | struct dst_entry dst; |
1da177e4 | 53 | |
29e75252 | 54 | int rt_genid; |
95c96174 | 55 | unsigned int rt_flags; |
1da177e4 | 56 | __u16 rt_type; |
155e8336 JA |
57 | __u8 rt_is_input; |
58 | __u8 rt_uses_gateway; | |
1da177e4 | 59 | |
1da177e4 LT |
60 | int rt_iif; |
61 | ||
62 | /* Info on neighbour */ | |
f2c3fe24 | 63 | __be32 rt_gateway; |
1da177e4 | 64 | |
1da177e4 | 65 | /* Miscellaneous cached information */ |
d52e5a7e SD |
66 | u32 rt_mtu_locked:1, |
67 | rt_pmtu:31; | |
caacf05e DM |
68 | |
69 | struct list_head rt_uncached; | |
5055c371 | 70 | struct uncached_list *rt_uncached_list; |
1da177e4 LT |
71 | }; |
72 | ||
b8400f37 | 73 | static inline bool rt_is_input_route(const struct rtable *rt) |
c7537967 | 74 | { |
9917e1e8 | 75 | return rt->rt_is_input != 0; |
c7537967 DM |
76 | } |
77 | ||
b8400f37 | 78 | static inline bool rt_is_output_route(const struct rtable *rt) |
c7537967 | 79 | { |
9917e1e8 | 80 | return rt->rt_is_input == 0; |
c7537967 DM |
81 | } |
82 | ||
f8126f1d DM |
83 | static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr) |
84 | { | |
85 | if (rt->rt_gateway) | |
86 | return rt->rt_gateway; | |
87 | return daddr; | |
88 | } | |
89 | ||
fd2c3ef7 | 90 | struct ip_rt_acct { |
1da177e4 LT |
91 | __u32 o_bytes; |
92 | __u32 o_packets; | |
93 | __u32 i_bytes; | |
94 | __u32 i_packets; | |
95 | }; | |
96 | ||
fd2c3ef7 | 97 | struct rt_cache_stat { |
1da177e4 LT |
98 | unsigned int in_slow_tot; |
99 | unsigned int in_slow_mc; | |
100 | unsigned int in_no_route; | |
101 | unsigned int in_brd; | |
102 | unsigned int in_martian_dst; | |
103 | unsigned int in_martian_src; | |
1da177e4 LT |
104 | unsigned int out_slow_tot; |
105 | unsigned int out_slow_mc; | |
1da177e4 LT |
106 | }; |
107 | ||
7d720c3e | 108 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
109 | |
110 | struct in_device; | |
2702c4bb JP |
111 | |
112 | int ip_rt_init(void); | |
113 | void rt_cache_flush(struct net *net); | |
114 | void rt_flush_dev(struct net_device *dev); | |
3abd1ade DA |
115 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp, |
116 | const struct sk_buff *skb); | |
117 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp, | |
118 | struct fib_result *res, | |
119 | const struct sk_buff *skb); | |
79a13159 PN |
120 | |
121 | static inline struct rtable *__ip_route_output_key(struct net *net, | |
122 | struct flowi4 *flp) | |
123 | { | |
3abd1ade | 124 | return ip_route_output_key_hash(net, flp, NULL); |
79a13159 PN |
125 | } |
126 | ||
2702c4bb | 127 | struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, |
6f9c9615 | 128 | const struct sock *sk); |
2702c4bb JP |
129 | struct dst_entry *ipv4_blackhole_route(struct net *net, |
130 | struct dst_entry *dst_orig); | |
407eadd9 | 131 | |
9d6ec938 | 132 | static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) |
5bfa787f DM |
133 | { |
134 | return ip_route_output_flow(net, flp, NULL); | |
135 | } | |
136 | ||
78fbfd8a DM |
137 | static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, |
138 | __be32 saddr, u8 tos, int oif) | |
139 | { | |
9d6ec938 DM |
140 | struct flowi4 fl4 = { |
141 | .flowi4_oif = oif, | |
c5d21c4b | 142 | .flowi4_tos = tos, |
9d6ec938 DM |
143 | .daddr = daddr, |
144 | .saddr = saddr, | |
78fbfd8a | 145 | }; |
9d6ec938 | 146 | return ip_route_output_key(net, &fl4); |
78fbfd8a DM |
147 | } |
148 | ||
31e4543d DM |
149 | static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4, |
150 | struct sock *sk, | |
78fbfd8a DM |
151 | __be32 daddr, __be32 saddr, |
152 | __be16 dport, __be16 sport, | |
153 | __u8 proto, __u8 tos, int oif) | |
154 | { | |
31e4543d | 155 | flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos, |
94b92b88 DM |
156 | RT_SCOPE_UNIVERSE, proto, |
157 | sk ? inet_sk_flowi_flags(sk) : 0, | |
e2d118a1 | 158 | daddr, saddr, dport, sport, sock_net_uid(net, sk)); |
78fbfd8a | 159 | if (sk) |
31e4543d DM |
160 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
161 | return ip_route_output_flow(net, fl4, sk); | |
78fbfd8a DM |
162 | } |
163 | ||
cbb1e85f | 164 | static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4, |
78fbfd8a DM |
165 | __be32 daddr, __be32 saddr, |
166 | __be32 gre_key, __u8 tos, int oif) | |
167 | { | |
cbb1e85f DM |
168 | memset(fl4, 0, sizeof(*fl4)); |
169 | fl4->flowi4_oif = oif; | |
170 | fl4->daddr = daddr; | |
171 | fl4->saddr = saddr; | |
172 | fl4->flowi4_tos = tos; | |
173 | fl4->flowi4_proto = IPPROTO_GRE; | |
174 | fl4->fl4_gre_key = gre_key; | |
175 | return ip_route_output_key(net, fl4); | |
78fbfd8a | 176 | } |
bc044e8d PA |
177 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
178 | u8 tos, struct net_device *dev, | |
179 | struct in_device *in_dev, u32 *itag); | |
2702c4bb JP |
180 | int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, |
181 | u8 tos, struct net_device *devin); | |
5510cdf7 DA |
182 | int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src, |
183 | u8 tos, struct net_device *devin, | |
184 | struct fib_result *res); | |
c6cffba4 DM |
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 | int err; | |
190 | ||
191 | rcu_read_lock(); | |
192 | err = ip_route_input_noref(skb, dst, src, tos, devin); | |
64327fc8 | 193 | if (!err) { |
222d7dbd | 194 | skb_dst_force(skb); |
64327fc8 SB |
195 | if (!skb_dst(skb)) |
196 | err = -EINVAL; | |
197 | } | |
c6cffba4 DM |
198 | rcu_read_unlock(); |
199 | ||
200 | return err; | |
201 | } | |
407eadd9 | 202 | |
2702c4bb | 203 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif, |
d888f396 | 204 | u8 protocol); |
2702c4bb | 205 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu); |
1042caa7 | 206 | void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol); |
2702c4bb JP |
207 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk); |
208 | void ip_rt_send_redirect(struct sk_buff *skb); | |
209 | ||
210 | unsigned int inet_addr_type(struct net *net, __be32 addr); | |
9b8ff518 | 211 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id); |
2702c4bb JP |
212 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
213 | __be32 addr); | |
30bbaa19 DA |
214 | unsigned int inet_addr_type_dev_table(struct net *net, |
215 | const struct net_device *dev, | |
216 | __be32 addr); | |
2702c4bb | 217 | void ip_rt_multicast_event(struct in_device *); |
ca25c300 | 218 | int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt); |
2702c4bb | 219 | void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt); |
9ab179d8 DA |
220 | struct rtable *rt_dst_alloc(struct net_device *dev, |
221 | unsigned int flags, u16 type, | |
222 | bool nopolicy, bool noxfrm, bool will_cache); | |
1da177e4 | 223 | |
0ff60a45 | 224 | struct in_ifaddr; |
2702c4bb JP |
225 | void fib_add_ifaddr(struct in_ifaddr *); |
226 | void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); | |
af4d768a | 227 | void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric); |
0ff60a45 | 228 | |
510c321b XL |
229 | void rt_add_uncached_list(struct rtable *rt); |
230 | void rt_del_uncached_list(struct rtable *rt); | |
231 | ||
6da025fa | 232 | static inline void ip_rt_put(struct rtable *rt) |
1da177e4 | 233 | { |
6da025fa ED |
234 | /* dst_release() accepts a NULL parameter. |
235 | * We rely on dst being first structure in struct rtable | |
236 | */ | |
237 | BUILD_BUG_ON(offsetof(struct rtable, dst) != 0); | |
238 | dst_release(&rt->dst); | |
1da177e4 LT |
239 | } |
240 | ||
241 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
242 | ||
4839c52b | 243 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
244 | |
245 | static inline char rt_tos2priority(u8 tos) | |
246 | { | |
247 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
248 | } | |
249 | ||
2d7192d6 DM |
250 | /* ip_route_connect() and ip_route_newports() work in tandem whilst |
251 | * binding a socket for a new outgoing connection. | |
252 | * | |
253 | * In order to use IPSEC properly, we must, in the end, have a | |
254 | * route that was looked up using all available keys including source | |
255 | * and destination ports. | |
256 | * | |
257 | * However, if a source port needs to be allocated (the user specified | |
258 | * a wildcard source port) we need to obtain addressing information | |
259 | * in order to perform that allocation. | |
260 | * | |
261 | * So ip_route_connect() looks up a route using wildcarded source and | |
262 | * destination ports in the key, simply so that we can get a pair of | |
263 | * addresses to use for port allocation. | |
264 | * | |
265 | * Later, once the ports are allocated, ip_route_newports() will make | |
266 | * another route lookup if needed to make sure we catch any IPSEC | |
267 | * rules keyed on the port information. | |
268 | * | |
269 | * The callers allocate the flow key on their stack, and must pass in | |
270 | * the same flowi4 object to both the ip_route_connect() and the | |
271 | * ip_route_newports() calls. | |
272 | */ | |
273 | ||
274 | static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, | |
275 | u32 tos, int oif, u8 protocol, | |
276 | __be16 sport, __be16 dport, | |
0e0d44ab | 277 | struct sock *sk) |
1da177e4 | 278 | { |
2d7192d6 | 279 | __u8 flow_flags = 0; |
79876874 KK |
280 | |
281 | if (inet_sk(sk)->transparent) | |
94b92b88 | 282 | flow_flags |= FLOWI_FLAG_ANYSRC; |
94b92b88 | 283 | |
2d7192d6 | 284 | flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, |
e2d118a1 LC |
285 | protocol, flow_flags, dst, src, dport, sport, |
286 | sk->sk_uid); | |
2d7192d6 DM |
287 | } |
288 | ||
289 | static inline struct rtable *ip_route_connect(struct flowi4 *fl4, | |
290 | __be32 dst, __be32 src, u32 tos, | |
291 | int oif, u8 protocol, | |
292 | __be16 sport, __be16 dport, | |
0e0d44ab | 293 | struct sock *sk) |
2d7192d6 DM |
294 | { |
295 | struct net *net = sock_net(sk); | |
296 | struct rtable *rt; | |
297 | ||
298 | ip_route_connect_init(fl4, dst, src, tos, oif, protocol, | |
0e0d44ab | 299 | sport, dport, sk); |
79876874 | 300 | |
1da177e4 | 301 | if (!dst || !src) { |
2d7192d6 | 302 | rt = __ip_route_output_key(net, fl4); |
b23dd4fe DM |
303 | if (IS_ERR(rt)) |
304 | return rt; | |
b23dd4fe | 305 | ip_rt_put(rt); |
e6b45241 | 306 | flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr); |
1da177e4 | 307 | } |
2d7192d6 DM |
308 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
309 | return ip_route_output_flow(net, fl4, sk); | |
1da177e4 LT |
310 | } |
311 | ||
2d7192d6 DM |
312 | static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, |
313 | __be16 orig_sport, __be16 orig_dport, | |
314 | __be16 sport, __be16 dport, | |
315 | struct sock *sk) | |
1da177e4 | 316 | { |
dca8b089 | 317 | if (sport != orig_sport || dport != orig_dport) { |
2d7192d6 DM |
318 | fl4->fl4_dport = dport; |
319 | fl4->fl4_sport = sport; | |
b23dd4fe | 320 | ip_rt_put(rt); |
e6b45241 JA |
321 | flowi4_update_output(fl4, sk->sk_bound_dev_if, |
322 | RT_CONN_FLAGS(sk), fl4->daddr, | |
323 | fl4->saddr); | |
2d7192d6 DM |
324 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
325 | return ip_route_output_flow(sock_net(sk), fl4, sk); | |
1da177e4 | 326 | } |
b23dd4fe | 327 | return rt; |
1da177e4 LT |
328 | } |
329 | ||
1668e010 KK |
330 | static inline int inet_iif(const struct sk_buff *skb) |
331 | { | |
0340d0b9 TH |
332 | struct rtable *rt = skb_rtable(skb); |
333 | ||
334 | if (rt && rt->rt_iif) | |
335 | return rt->rt_iif; | |
13378cad | 336 | |
13378cad | 337 | return skb->skb_iif; |
1668e010 KK |
338 | } |
339 | ||
323e126f DM |
340 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) |
341 | { | |
342 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
fa50d974 | 343 | struct net *net = dev_net(dst->dev); |
323e126f DM |
344 | |
345 | if (hoplimit == 0) | |
fa50d974 | 346 | hoplimit = net->ipv4.sysctl_ip_default_ttl; |
323e126f DM |
347 | return hoplimit; |
348 | } | |
349 | ||
1da177e4 | 350 | #endif /* _ROUTE_H */ |