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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; | |
fd2c3ef7 | 52 | struct rtable { |
d8d1f30b | 53 | struct dst_entry dst; |
1da177e4 | 54 | |
093c2ca4 ED |
55 | /* Cache lookup keys */ |
56 | struct flowi fl; | |
57 | ||
1da177e4 LT |
58 | struct in_device *idev; |
59 | ||
29e75252 | 60 | int rt_genid; |
1da177e4 LT |
61 | unsigned rt_flags; |
62 | __u16 rt_type; | |
1da177e4 | 63 | |
f2c3fe24 AV |
64 | __be32 rt_dst; /* Path destination */ |
65 | __be32 rt_src; /* Path source */ | |
1da177e4 LT |
66 | int rt_iif; |
67 | ||
68 | /* Info on neighbour */ | |
f2c3fe24 | 69 | __be32 rt_gateway; |
1da177e4 | 70 | |
1da177e4 | 71 | /* Miscellaneous cached information */ |
f2c3fe24 | 72 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
1da177e4 LT |
73 | struct inet_peer *peer; /* long-living peer info */ |
74 | }; | |
75 | ||
fd2c3ef7 | 76 | struct ip_rt_acct { |
1da177e4 LT |
77 | __u32 o_bytes; |
78 | __u32 o_packets; | |
79 | __u32 i_bytes; | |
80 | __u32 i_packets; | |
81 | }; | |
82 | ||
fd2c3ef7 | 83 | struct rt_cache_stat { |
1da177e4 LT |
84 | unsigned int in_hit; |
85 | unsigned int in_slow_tot; | |
86 | unsigned int in_slow_mc; | |
87 | unsigned int in_no_route; | |
88 | unsigned int in_brd; | |
89 | unsigned int in_martian_dst; | |
90 | unsigned int in_martian_src; | |
91 | unsigned int out_hit; | |
92 | unsigned int out_slow_tot; | |
93 | unsigned int out_slow_mc; | |
94 | unsigned int gc_total; | |
95 | unsigned int gc_ignored; | |
96 | unsigned int gc_goal_miss; | |
97 | unsigned int gc_dst_overflow; | |
98 | unsigned int in_hlist_search; | |
99 | unsigned int out_hlist_search; | |
100 | }; | |
101 | ||
7d720c3e | 102 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
1da177e4 LT |
103 | |
104 | struct in_device; | |
105 | extern int ip_rt_init(void); | |
f7655229 AV |
106 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
107 | __be32 src, struct net_device *dev); | |
76e6ebfb | 108 | extern void rt_cache_flush(struct net *net, int how); |
a5ee1551 | 109 | extern void rt_cache_flush_batch(void); |
611c183e | 110 | extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); |
f206351a | 111 | extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); |
f1b050bf | 112 | extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); |
407eadd9 ED |
113 | |
114 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, | |
115 | u8 tos, struct net_device *devin, bool noref); | |
116 | ||
117 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
118 | u8 tos, struct net_device *devin) | |
119 | { | |
120 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
121 | } | |
122 | ||
123 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
124 | u8 tos, struct net_device *devin) | |
125 | { | |
126 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
127 | } | |
128 | ||
0010e465 | 129 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
130 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
131 | ||
6b175b26 EB |
132 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
133 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 134 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 135 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
136 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
137 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
138 | ||
0ff60a45 JHS |
139 | struct in_ifaddr; |
140 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
141 | ||
1da177e4 LT |
142 | static inline void ip_rt_put(struct rtable * rt) |
143 | { | |
144 | if (rt) | |
d8d1f30b | 145 | dst_release(&rt->dst); |
1da177e4 LT |
146 | } |
147 | ||
148 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
149 | ||
4839c52b | 150 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
151 | |
152 | static inline char rt_tos2priority(u8 tos) | |
153 | { | |
154 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
155 | } | |
156 | ||
bada8adc AV |
157 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, |
158 | __be32 src, u32 tos, int oif, u8 protocol, | |
8eb9086f DM |
159 | __be16 sport, __be16 dport, struct sock *sk, |
160 | int flags) | |
1da177e4 LT |
161 | { |
162 | struct flowi fl = { .oif = oif, | |
4a19ec58 | 163 | .mark = sk->sk_mark, |
1da177e4 LT |
164 | .nl_u = { .ip4_u = { .daddr = dst, |
165 | .saddr = src, | |
166 | .tos = tos } }, | |
167 | .proto = protocol, | |
168 | .uli_u = { .ports = | |
169 | { .sport = sport, | |
170 | .dport = dport } } }; | |
171 | ||
172 | int err; | |
3b1e0a65 | 173 | struct net *net = sock_net(sk); |
79876874 KK |
174 | |
175 | if (inet_sk(sk)->transparent) | |
176 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
177 | ||
1da177e4 | 178 | if (!dst || !src) { |
eee80592 | 179 | err = __ip_route_output_key(net, rp, &fl); |
1da177e4 LT |
180 | if (err) |
181 | return err; | |
182 | fl.fl4_dst = (*rp)->rt_dst; | |
183 | fl.fl4_src = (*rp)->rt_src; | |
184 | ip_rt_put(*rp); | |
185 | *rp = NULL; | |
186 | } | |
beb8d13b | 187 | security_sk_classify_flow(sk, &fl); |
eee80592 | 188 | return ip_route_output_flow(net, rp, &fl, sk, flags); |
1da177e4 LT |
189 | } |
190 | ||
5d39a795 | 191 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
39dccd9d | 192 | __be16 sport, __be16 dport, struct sock *sk) |
1da177e4 LT |
193 | { |
194 | if (sport != (*rp)->fl.fl_ip_sport || | |
195 | dport != (*rp)->fl.fl_ip_dport) { | |
196 | struct flowi fl; | |
197 | ||
198 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
199 | fl.fl_ip_sport = sport; | |
200 | fl.fl_ip_dport = dport; | |
5d39a795 | 201 | fl.proto = protocol; |
fb0c5f0b UW |
202 | if (inet_sk(sk)->transparent) |
203 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
1da177e4 LT |
204 | ip_rt_put(*rp); |
205 | *rp = NULL; | |
beb8d13b | 206 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 207 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); |
1da177e4 LT |
208 | } |
209 | return 0; | |
210 | } | |
211 | ||
212 | extern void rt_bind_peer(struct rtable *rt, int create); | |
213 | ||
214 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
215 | { | |
216 | if (rt->peer) | |
217 | return rt->peer; | |
218 | ||
219 | rt_bind_peer(rt, 0); | |
220 | return rt->peer; | |
221 | } | |
222 | ||
1668e010 KK |
223 | static inline int inet_iif(const struct sk_buff *skb) |
224 | { | |
511c3f92 | 225 | return skb_rtable(skb)->rt_iif; |
1668e010 KK |
226 | } |
227 | ||
1da177e4 | 228 | #endif /* _ROUTE_H */ |