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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> | |
30 | #include <linux/in_route.h> | |
31 | #include <linux/rtnetlink.h> | |
32 | #include <linux/route.h> | |
33 | #include <linux/ip.h> | |
34 | #include <linux/cache.h> | |
35 | ||
36 | #ifndef __KERNEL__ | |
37 | #warning This file is not supposed to be used outside of kernel. | |
38 | #endif | |
39 | ||
40 | #define RTO_ONLINK 0x01 | |
41 | ||
42 | #define RTO_CONN 0 | |
43 | /* RTO_CONN is not used (being alias for 0), but preserved not to break | |
44 | * some modules referring to it. */ | |
45 | ||
46 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) | |
47 | ||
48 | struct fib_nh; | |
49 | struct inet_peer; | |
50 | struct rtable | |
51 | { | |
52 | union | |
53 | { | |
54 | struct dst_entry dst; | |
55 | struct rtable *rt_next; | |
56 | } u; | |
57 | ||
58 | struct in_device *idev; | |
59 | ||
60 | unsigned rt_flags; | |
61 | __u16 rt_type; | |
62 | __u16 rt_multipath_alg; | |
63 | ||
64 | __u32 rt_dst; /* Path destination */ | |
65 | __u32 rt_src; /* Path source */ | |
66 | int rt_iif; | |
67 | ||
68 | /* Info on neighbour */ | |
69 | __u32 rt_gateway; | |
70 | ||
71 | /* Cache lookup keys */ | |
72 | struct flowi fl; | |
73 | ||
74 | /* Miscellaneous cached information */ | |
75 | __u32 rt_spec_dst; /* RFC1122 specific destination */ | |
76 | struct inet_peer *peer; /* long-living peer info */ | |
77 | }; | |
78 | ||
79 | struct ip_rt_acct | |
80 | { | |
81 | __u32 o_bytes; | |
82 | __u32 o_packets; | |
83 | __u32 i_bytes; | |
84 | __u32 i_packets; | |
85 | }; | |
86 | ||
87 | struct rt_cache_stat | |
88 | { | |
89 | unsigned int in_hit; | |
90 | unsigned int in_slow_tot; | |
91 | unsigned int in_slow_mc; | |
92 | unsigned int in_no_route; | |
93 | unsigned int in_brd; | |
94 | unsigned int in_martian_dst; | |
95 | unsigned int in_martian_src; | |
96 | unsigned int out_hit; | |
97 | unsigned int out_slow_tot; | |
98 | unsigned int out_slow_mc; | |
99 | unsigned int gc_total; | |
100 | unsigned int gc_ignored; | |
101 | unsigned int gc_goal_miss; | |
102 | unsigned int gc_dst_overflow; | |
103 | unsigned int in_hlist_search; | |
104 | unsigned int out_hlist_search; | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | extern struct ip_rt_acct *ip_rt_acct; |
108 | ||
109 | struct in_device; | |
110 | extern int ip_rt_init(void); | |
111 | extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw, | |
cef2685e | 112 | u32 src, struct net_device *dev); |
1da177e4 LT |
113 | extern void ip_rt_advice(struct rtable **rp, int advice); |
114 | extern void rt_cache_flush(int how); | |
115 | extern int __ip_route_output_key(struct rtable **, const struct flowi *flp); | |
116 | extern int ip_route_output_key(struct rtable **, struct flowi *flp); | |
117 | extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); | |
118 | extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin); | |
119 | extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu); | |
120 | extern void ip_rt_send_redirect(struct sk_buff *skb); | |
121 | ||
122 | extern unsigned inet_addr_type(u32 addr); | |
123 | extern void ip_rt_multicast_event(struct in_device *); | |
124 | extern int ip_rt_ioctl(unsigned int cmd, void __user *arg); | |
125 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); | |
126 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
127 | ||
0ff60a45 JHS |
128 | struct in_ifaddr; |
129 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
130 | ||
1da177e4 LT |
131 | static inline void ip_rt_put(struct rtable * rt) |
132 | { | |
133 | if (rt) | |
134 | dst_release(&rt->u.dst); | |
135 | } | |
136 | ||
137 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
138 | ||
139 | extern __u8 ip_tos2prio[16]; | |
140 | ||
141 | static inline char rt_tos2priority(u8 tos) | |
142 | { | |
143 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
144 | } | |
145 | ||
146 | static inline int ip_route_connect(struct rtable **rp, u32 dst, | |
147 | u32 src, u32 tos, int oif, u8 protocol, | |
148 | u16 sport, u16 dport, struct sock *sk) | |
149 | { | |
150 | struct flowi fl = { .oif = oif, | |
151 | .nl_u = { .ip4_u = { .daddr = dst, | |
152 | .saddr = src, | |
153 | .tos = tos } }, | |
154 | .proto = protocol, | |
155 | .uli_u = { .ports = | |
156 | { .sport = sport, | |
157 | .dport = dport } } }; | |
158 | ||
159 | int err; | |
160 | if (!dst || !src) { | |
161 | err = __ip_route_output_key(rp, &fl); | |
162 | if (err) | |
163 | return err; | |
164 | fl.fl4_dst = (*rp)->rt_dst; | |
165 | fl.fl4_src = (*rp)->rt_src; | |
166 | ip_rt_put(*rp); | |
167 | *rp = NULL; | |
168 | } | |
169 | return ip_route_output_flow(rp, &fl, sk, 0); | |
170 | } | |
171 | ||
5d39a795 PM |
172 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
173 | u16 sport, u16 dport, struct sock *sk) | |
1da177e4 LT |
174 | { |
175 | if (sport != (*rp)->fl.fl_ip_sport || | |
176 | dport != (*rp)->fl.fl_ip_dport) { | |
177 | struct flowi fl; | |
178 | ||
179 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
180 | fl.fl_ip_sport = sport; | |
181 | fl.fl_ip_dport = dport; | |
5d39a795 | 182 | fl.proto = protocol; |
1da177e4 LT |
183 | ip_rt_put(*rp); |
184 | *rp = NULL; | |
185 | return ip_route_output_flow(rp, &fl, sk, 0); | |
186 | } | |
187 | return 0; | |
188 | } | |
189 | ||
190 | extern void rt_bind_peer(struct rtable *rt, int create); | |
191 | ||
192 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
193 | { | |
194 | if (rt->peer) | |
195 | return rt->peer; | |
196 | ||
197 | rt_bind_peer(rt, 0); | |
198 | return rt->peer; | |
199 | } | |
200 | ||
20380731 ACM |
201 | extern ctl_table ipv4_route_table[]; |
202 | ||
1da177e4 | 203 | #endif /* _ROUTE_H */ |