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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 | ||
27 | #include <linux/config.h> | |
28 | #include <net/dst.h> | |
29 | #include <net/inetpeer.h> | |
30 | #include <net/flow.h> | |
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> | |
36 | ||
37 | #ifndef __KERNEL__ | |
38 | #warning This file is not supposed to be used outside of kernel. | |
39 | #endif | |
40 | ||
41 | #define RTO_ONLINK 0x01 | |
42 | ||
43 | #define RTO_CONN 0 | |
44 | /* RTO_CONN is not used (being alias for 0), but preserved not to break | |
45 | * some modules referring to it. */ | |
46 | ||
47 | #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) | |
48 | ||
49 | struct fib_nh; | |
50 | struct inet_peer; | |
51 | struct rtable | |
52 | { | |
53 | union | |
54 | { | |
55 | struct dst_entry dst; | |
56 | struct rtable *rt_next; | |
57 | } u; | |
58 | ||
59 | struct in_device *idev; | |
60 | ||
61 | unsigned rt_flags; | |
62 | __u16 rt_type; | |
63 | __u16 rt_multipath_alg; | |
64 | ||
65 | __u32 rt_dst; /* Path destination */ | |
66 | __u32 rt_src; /* Path source */ | |
67 | int rt_iif; | |
68 | ||
69 | /* Info on neighbour */ | |
70 | __u32 rt_gateway; | |
71 | ||
72 | /* Cache lookup keys */ | |
73 | struct flowi fl; | |
74 | ||
75 | /* Miscellaneous cached information */ | |
76 | __u32 rt_spec_dst; /* RFC1122 specific destination */ | |
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 | ||
108 | extern struct rt_cache_stat *rt_cache_stat; | |
109 | #define RT_CACHE_STAT_INC(field) \ | |
110 | (per_cpu_ptr(rt_cache_stat, _smp_processor_id())->field++) | |
111 | ||
112 | extern struct ip_rt_acct *ip_rt_acct; | |
113 | ||
114 | struct in_device; | |
115 | extern int ip_rt_init(void); | |
116 | extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw, | |
117 | u32 src, u8 tos, struct net_device *dev); | |
118 | extern void ip_rt_advice(struct rtable **rp, int advice); | |
119 | extern void rt_cache_flush(int how); | |
120 | extern int __ip_route_output_key(struct rtable **, const struct flowi *flp); | |
121 | extern int ip_route_output_key(struct rtable **, struct flowi *flp); | |
122 | extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); | |
123 | extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin); | |
124 | extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu); | |
125 | extern void ip_rt_send_redirect(struct sk_buff *skb); | |
126 | ||
127 | extern unsigned inet_addr_type(u32 addr); | |
128 | extern void ip_rt_multicast_event(struct in_device *); | |
129 | extern int ip_rt_ioctl(unsigned int cmd, void __user *arg); | |
130 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); | |
131 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
132 | ||
133 | static inline void ip_rt_put(struct rtable * rt) | |
134 | { | |
135 | if (rt) | |
136 | dst_release(&rt->u.dst); | |
137 | } | |
138 | ||
139 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
140 | ||
141 | extern __u8 ip_tos2prio[16]; | |
142 | ||
143 | static inline char rt_tos2priority(u8 tos) | |
144 | { | |
145 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
146 | } | |
147 | ||
148 | static inline int ip_route_connect(struct rtable **rp, u32 dst, | |
149 | u32 src, u32 tos, int oif, u8 protocol, | |
150 | u16 sport, u16 dport, struct sock *sk) | |
151 | { | |
152 | struct flowi fl = { .oif = oif, | |
153 | .nl_u = { .ip4_u = { .daddr = dst, | |
154 | .saddr = src, | |
155 | .tos = tos } }, | |
156 | .proto = protocol, | |
157 | .uli_u = { .ports = | |
158 | { .sport = sport, | |
159 | .dport = dport } } }; | |
160 | ||
161 | int err; | |
162 | if (!dst || !src) { | |
163 | err = __ip_route_output_key(rp, &fl); | |
164 | if (err) | |
165 | return err; | |
166 | fl.fl4_dst = (*rp)->rt_dst; | |
167 | fl.fl4_src = (*rp)->rt_src; | |
168 | ip_rt_put(*rp); | |
169 | *rp = NULL; | |
170 | } | |
171 | return ip_route_output_flow(rp, &fl, sk, 0); | |
172 | } | |
173 | ||
174 | static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport, | |
175 | struct sock *sk) | |
176 | { | |
177 | if (sport != (*rp)->fl.fl_ip_sport || | |
178 | dport != (*rp)->fl.fl_ip_dport) { | |
179 | struct flowi fl; | |
180 | ||
181 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
182 | fl.fl_ip_sport = sport; | |
183 | fl.fl_ip_dport = dport; | |
1da177e4 LT |
184 | ip_rt_put(*rp); |
185 | *rp = NULL; | |
186 | return ip_route_output_flow(rp, &fl, sk, 0); | |
187 | } | |
188 | return 0; | |
189 | } | |
190 | ||
191 | extern void rt_bind_peer(struct rtable *rt, int create); | |
192 | ||
193 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
194 | { | |
195 | if (rt->peer) | |
196 | return rt->peer; | |
197 | ||
198 | rt_bind_peer(rt, 0); | |
199 | return rt->peer; | |
200 | } | |
201 | ||
202 | #endif /* _ROUTE_H */ |