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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; | |
62fa8a84 | 43 | struct fib_info; |
fd2c3ef7 | 44 | struct rtable { |
d8d1f30b | 45 | struct dst_entry dst; |
1da177e4 | 46 | |
29e75252 | 47 | int rt_genid; |
95c96174 | 48 | unsigned int rt_flags; |
1da177e4 | 49 | __u16 rt_type; |
9917e1e8 | 50 | __u16 rt_is_input; |
1da177e4 | 51 | |
1da177e4 LT |
52 | int rt_iif; |
53 | ||
54 | /* Info on neighbour */ | |
f2c3fe24 | 55 | __be32 rt_gateway; |
1da177e4 | 56 | |
1da177e4 | 57 | /* Miscellaneous cached information */ |
5943634f | 58 | u32 rt_pmtu; |
1da177e4 LT |
59 | }; |
60 | ||
b8400f37 | 61 | static inline bool rt_is_input_route(const struct rtable *rt) |
c7537967 | 62 | { |
9917e1e8 | 63 | return rt->rt_is_input != 0; |
c7537967 DM |
64 | } |
65 | ||
b8400f37 | 66 | static inline bool rt_is_output_route(const struct rtable *rt) |
c7537967 | 67 | { |
9917e1e8 | 68 | return rt->rt_is_input == 0; |
c7537967 DM |
69 | } |
70 | ||
f8126f1d DM |
71 | static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr) |
72 | { | |
73 | if (rt->rt_gateway) | |
74 | return rt->rt_gateway; | |
75 | return daddr; | |
76 | } | |
77 | ||
fd2c3ef7 | 78 | struct ip_rt_acct { |
1da177e4 LT |
79 | __u32 o_bytes; |
80 | __u32 o_packets; | |
81 | __u32 i_bytes; | |
82 | __u32 i_packets; | |
83 | }; | |
84 | ||
fd2c3ef7 | 85 | struct rt_cache_stat { |
1da177e4 LT |
86 | unsigned int in_hit; |
87 | unsigned int in_slow_tot; | |
88 | unsigned int in_slow_mc; | |
89 | unsigned int in_no_route; | |
90 | unsigned int in_brd; | |
91 | unsigned int in_martian_dst; | |
92 | unsigned int in_martian_src; | |
93 | unsigned int out_hit; | |
94 | unsigned int out_slow_tot; | |
95 | unsigned int out_slow_mc; | |
96 | unsigned int gc_total; | |
97 | unsigned int gc_ignored; | |
98 | unsigned int gc_goal_miss; | |
99 | unsigned int gc_dst_overflow; | |
100 | unsigned int in_hlist_search; | |
101 | unsigned int out_hlist_search; | |
102 | }; | |
103 | ||
7d720c3e | 104 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
105 | |
106 | struct in_device; | |
107 | extern int ip_rt_init(void); | |
76e6ebfb | 108 | extern void rt_cache_flush(struct net *net, int how); |
813b3b5d | 109 | extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp); |
9d6ec938 | 110 | extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, |
b23dd4fe | 111 | struct sock *sk); |
2774c131 | 112 | extern struct dst_entry *ipv4_blackhole_route(struct net *net, 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 | ||
38a424e4 DM |
160 | extern int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, |
161 | u8 tos, struct net_device *devin); | |
407eadd9 | 162 | |
36393395 DM |
163 | extern void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
164 | int oif, u32 mark, u8 protocol, int flow_flags); | |
165 | extern void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu); | |
b42597e2 DM |
166 | extern void ipv4_redirect(struct sk_buff *skb, struct net *net, |
167 | int oif, u32 mark, u8 protocol, int flow_flags); | |
168 | extern void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk); | |
36393395 | 169 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
1da177e4 | 170 | |
95c96174 ED |
171 | extern unsigned int inet_addr_type(struct net *net, __be32 addr); |
172 | extern unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 173 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 174 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
8e36360a | 175 | extern void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt); |
1da177e4 LT |
176 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); |
177 | ||
0ff60a45 JHS |
178 | struct in_ifaddr; |
179 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
e6abbaa2 | 180 | extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); |
0ff60a45 | 181 | |
1da177e4 LT |
182 | static inline void ip_rt_put(struct rtable * rt) |
183 | { | |
184 | if (rt) | |
d8d1f30b | 185 | dst_release(&rt->dst); |
1da177e4 LT |
186 | } |
187 | ||
188 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
189 | ||
4839c52b | 190 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
191 | |
192 | static inline char rt_tos2priority(u8 tos) | |
193 | { | |
194 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
195 | } | |
196 | ||
2d7192d6 DM |
197 | /* ip_route_connect() and ip_route_newports() work in tandem whilst |
198 | * binding a socket for a new outgoing connection. | |
199 | * | |
200 | * In order to use IPSEC properly, we must, in the end, have a | |
201 | * route that was looked up using all available keys including source | |
202 | * and destination ports. | |
203 | * | |
204 | * However, if a source port needs to be allocated (the user specified | |
205 | * a wildcard source port) we need to obtain addressing information | |
206 | * in order to perform that allocation. | |
207 | * | |
208 | * So ip_route_connect() looks up a route using wildcarded source and | |
209 | * destination ports in the key, simply so that we can get a pair of | |
210 | * addresses to use for port allocation. | |
211 | * | |
212 | * Later, once the ports are allocated, ip_route_newports() will make | |
213 | * another route lookup if needed to make sure we catch any IPSEC | |
214 | * rules keyed on the port information. | |
215 | * | |
216 | * The callers allocate the flow key on their stack, and must pass in | |
217 | * the same flowi4 object to both the ip_route_connect() and the | |
218 | * ip_route_newports() calls. | |
219 | */ | |
220 | ||
221 | static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, | |
222 | u32 tos, int oif, u8 protocol, | |
223 | __be16 sport, __be16 dport, | |
224 | struct sock *sk, bool can_sleep) | |
1da177e4 | 225 | { |
2d7192d6 | 226 | __u8 flow_flags = 0; |
79876874 KK |
227 | |
228 | if (inet_sk(sk)->transparent) | |
94b92b88 | 229 | flow_flags |= FLOWI_FLAG_ANYSRC; |
5df65e55 | 230 | if (can_sleep) |
94b92b88 DM |
231 | flow_flags |= FLOWI_FLAG_CAN_SLEEP; |
232 | ||
2d7192d6 | 233 | flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE, |
94b92b88 | 234 | protocol, flow_flags, dst, src, dport, sport); |
2d7192d6 DM |
235 | } |
236 | ||
237 | static inline struct rtable *ip_route_connect(struct flowi4 *fl4, | |
238 | __be32 dst, __be32 src, u32 tos, | |
239 | int oif, u8 protocol, | |
240 | __be16 sport, __be16 dport, | |
241 | struct sock *sk, bool can_sleep) | |
242 | { | |
243 | struct net *net = sock_net(sk); | |
244 | struct rtable *rt; | |
245 | ||
246 | ip_route_connect_init(fl4, dst, src, tos, oif, protocol, | |
247 | sport, dport, sk, can_sleep); | |
79876874 | 248 | |
1da177e4 | 249 | if (!dst || !src) { |
2d7192d6 | 250 | rt = __ip_route_output_key(net, fl4); |
b23dd4fe DM |
251 | if (IS_ERR(rt)) |
252 | return rt; | |
b23dd4fe | 253 | ip_rt_put(rt); |
e6b45241 | 254 | flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr); |
1da177e4 | 255 | } |
2d7192d6 DM |
256 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
257 | return ip_route_output_flow(net, fl4, sk); | |
1da177e4 LT |
258 | } |
259 | ||
2d7192d6 DM |
260 | static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, |
261 | __be16 orig_sport, __be16 orig_dport, | |
262 | __be16 sport, __be16 dport, | |
263 | struct sock *sk) | |
1da177e4 | 264 | { |
dca8b089 | 265 | if (sport != orig_sport || dport != orig_dport) { |
2d7192d6 DM |
266 | fl4->fl4_dport = dport; |
267 | fl4->fl4_sport = sport; | |
b23dd4fe | 268 | ip_rt_put(rt); |
e6b45241 JA |
269 | flowi4_update_output(fl4, sk->sk_bound_dev_if, |
270 | RT_CONN_FLAGS(sk), fl4->daddr, | |
271 | fl4->saddr); | |
2d7192d6 DM |
272 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
273 | return ip_route_output_flow(sock_net(sk), fl4, sk); | |
1da177e4 | 274 | } |
b23dd4fe | 275 | return rt; |
1da177e4 LT |
276 | } |
277 | ||
1668e010 KK |
278 | static inline int inet_iif(const struct sk_buff *skb) |
279 | { | |
13378cad DM |
280 | int iif = skb_rtable(skb)->rt_iif; |
281 | ||
282 | if (iif) | |
283 | return iif; | |
284 | return skb->skb_iif; | |
1668e010 KK |
285 | } |
286 | ||
323e126f DM |
287 | extern int sysctl_ip_default_ttl; |
288 | ||
289 | static inline int ip4_dst_hoplimit(const struct dst_entry *dst) | |
290 | { | |
291 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
292 | ||
293 | if (hoplimit == 0) | |
294 | hoplimit = sysctl_ip_default_ttl; | |
295 | return hoplimit; | |
296 | } | |
297 | ||
1da177e4 | 298 | #endif /* _ROUTE_H */ |