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> | |
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; | |
52 | struct rtable | |
53 | { | |
54 | union | |
55 | { | |
56 | struct dst_entry dst; | |
1da177e4 LT |
57 | } u; |
58 | ||
093c2ca4 ED |
59 | /* Cache lookup keys */ |
60 | struct flowi fl; | |
61 | ||
1da177e4 LT |
62 | struct in_device *idev; |
63 | ||
29e75252 | 64 | int rt_genid; |
1da177e4 LT |
65 | unsigned rt_flags; |
66 | __u16 rt_type; | |
1da177e4 | 67 | |
f2c3fe24 AV |
68 | __be32 rt_dst; /* Path destination */ |
69 | __be32 rt_src; /* Path source */ | |
1da177e4 LT |
70 | int rt_iif; |
71 | ||
72 | /* Info on neighbour */ | |
f2c3fe24 | 73 | __be32 rt_gateway; |
1da177e4 | 74 | |
1da177e4 | 75 | /* Miscellaneous cached information */ |
f2c3fe24 | 76 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
1da177e4 LT |
77 | struct inet_peer *peer; /* long-living peer info */ |
78 | }; | |
79 | ||
80 | struct ip_rt_acct | |
81 | { | |
82 | __u32 o_bytes; | |
83 | __u32 o_packets; | |
84 | __u32 i_bytes; | |
85 | __u32 i_packets; | |
86 | }; | |
87 | ||
88 | struct rt_cache_stat | |
89 | { | |
90 | unsigned int in_hit; | |
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; | |
97 | unsigned int out_hit; | |
98 | unsigned int out_slow_tot; | |
99 | unsigned int out_slow_mc; | |
100 | unsigned int gc_total; | |
101 | unsigned int gc_ignored; | |
102 | unsigned int gc_goal_miss; | |
103 | unsigned int gc_dst_overflow; | |
104 | unsigned int in_hlist_search; | |
105 | unsigned int out_hlist_search; | |
106 | }; | |
107 | ||
1da177e4 LT |
108 | extern struct ip_rt_acct *ip_rt_acct; |
109 | ||
110 | struct in_device; | |
111 | extern int ip_rt_init(void); | |
f7655229 AV |
112 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
113 | __be32 src, struct net_device *dev); | |
76e6ebfb | 114 | extern void rt_cache_flush(struct net *net, int how); |
611c183e | 115 | extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); |
f206351a | 116 | extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); |
f1b050bf | 117 | extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); |
9e12bb22 | 118 | extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); |
0010e465 | 119 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
1da177e4 LT |
120 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
121 | ||
6b175b26 EB |
122 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
123 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
1da177e4 | 124 | extern void ip_rt_multicast_event(struct in_device *); |
1bad118a | 125 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
1da177e4 LT |
126 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
127 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
128 | ||
0ff60a45 JHS |
129 | struct in_ifaddr; |
130 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
131 | ||
1da177e4 LT |
132 | static inline void ip_rt_put(struct rtable * rt) |
133 | { | |
134 | if (rt) | |
135 | dst_release(&rt->u.dst); | |
136 | } | |
137 | ||
138 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
139 | ||
4839c52b | 140 | extern const __u8 ip_tos2prio[16]; |
1da177e4 LT |
141 | |
142 | static inline char rt_tos2priority(u8 tos) | |
143 | { | |
144 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
145 | } | |
146 | ||
bada8adc AV |
147 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, |
148 | __be32 src, u32 tos, int oif, u8 protocol, | |
8eb9086f DM |
149 | __be16 sport, __be16 dport, struct sock *sk, |
150 | int flags) | |
1da177e4 LT |
151 | { |
152 | struct flowi fl = { .oif = oif, | |
4a19ec58 | 153 | .mark = sk->sk_mark, |
1da177e4 LT |
154 | .nl_u = { .ip4_u = { .daddr = dst, |
155 | .saddr = src, | |
156 | .tos = tos } }, | |
157 | .proto = protocol, | |
158 | .uli_u = { .ports = | |
159 | { .sport = sport, | |
160 | .dport = dport } } }; | |
161 | ||
162 | int err; | |
3b1e0a65 | 163 | struct net *net = sock_net(sk); |
79876874 KK |
164 | |
165 | if (inet_sk(sk)->transparent) | |
166 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
167 | ||
1da177e4 | 168 | if (!dst || !src) { |
eee80592 | 169 | err = __ip_route_output_key(net, rp, &fl); |
1da177e4 LT |
170 | if (err) |
171 | return err; | |
172 | fl.fl4_dst = (*rp)->rt_dst; | |
173 | fl.fl4_src = (*rp)->rt_src; | |
174 | ip_rt_put(*rp); | |
175 | *rp = NULL; | |
176 | } | |
beb8d13b | 177 | security_sk_classify_flow(sk, &fl); |
eee80592 | 178 | return ip_route_output_flow(net, rp, &fl, sk, flags); |
1da177e4 LT |
179 | } |
180 | ||
5d39a795 | 181 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
39dccd9d | 182 | __be16 sport, __be16 dport, struct sock *sk) |
1da177e4 LT |
183 | { |
184 | if (sport != (*rp)->fl.fl_ip_sport || | |
185 | dport != (*rp)->fl.fl_ip_dport) { | |
186 | struct flowi fl; | |
187 | ||
188 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
189 | fl.fl_ip_sport = sport; | |
190 | fl.fl_ip_dport = dport; | |
5d39a795 | 191 | fl.proto = protocol; |
1da177e4 LT |
192 | ip_rt_put(*rp); |
193 | *rp = NULL; | |
beb8d13b | 194 | security_sk_classify_flow(sk, &fl); |
3b1e0a65 | 195 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); |
1da177e4 LT |
196 | } |
197 | return 0; | |
198 | } | |
199 | ||
200 | extern void rt_bind_peer(struct rtable *rt, int create); | |
201 | ||
202 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
203 | { | |
204 | if (rt->peer) | |
205 | return rt->peer; | |
206 | ||
207 | rt_bind_peer(rt, 0); | |
208 | return rt->peer; | |
209 | } | |
210 | ||
1668e010 KK |
211 | static inline int inet_iif(const struct sk_buff *skb) |
212 | { | |
213 | return skb->rtable->rt_iif; | |
214 | } | |
215 | ||
1da177e4 | 216 | #endif /* _ROUTE_H */ |