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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 | * |
10 | * Authors: Ross Biro |
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 <net/dst.h> |
28 | #include <net/inetpeer.h> |
29 | #include <net/flow.h> |
30 | #include <net/inet_sock.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 | #include <linux/security.h> |
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 | union { |
54 | struct dst_entry dst; |
55 | } u; |
56 | |
57 | /* Cache lookup keys */ |
58 | struct flowi fl; |
59 | |
60 | struct in_device *idev; |
61 | |
62 | int rt_genid; |
63 | unsigned rt_flags; |
64 | __u16 rt_type; |
65 | |
66 | __be32 rt_dst; /* Path destination */ |
67 | __be32 rt_src; /* Path source */ |
68 | int rt_iif; |
69 | |
70 | /* Info on neighbour */ |
71 | __be32 rt_gateway; |
72 | |
73 | /* Miscellaneous cached information */ |
74 | __be32 rt_spec_dst; /* RFC1122 specific destination */ |
75 | struct inet_peer *peer; /* long-living peer info */ |
76 | }; |
77 | |
78 | struct ip_rt_acct { |
79 | __u32 o_bytes; |
80 | __u32 o_packets; |
81 | __u32 i_bytes; |
82 | __u32 i_packets; |
83 | }; |
84 | |
85 | struct rt_cache_stat { |
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 | |
104 | extern struct ip_rt_acct __percpu *ip_rt_acct; |
105 | |
106 | struct in_device; |
107 | extern int ip_rt_init(void); |
108 | extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw, |
109 | __be32 src, struct net_device *dev); |
110 | extern void rt_cache_flush(struct net *net, int how); |
111 | extern void rt_cache_flush_batch(void); |
112 | extern int __ip_route_output_key(struct net *, struct rtable **, const struct flowi *flp); |
113 | extern int ip_route_output_key(struct net *, struct rtable **, struct flowi *flp); |
114 | extern int ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags); |
115 | extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin); |
116 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); |
117 | extern void ip_rt_send_redirect(struct sk_buff *skb); |
118 | |
119 | extern unsigned inet_addr_type(struct net *net, __be32 addr); |
120 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); |
121 | extern void ip_rt_multicast_event(struct in_device *); |
122 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); |
123 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); |
124 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); |
125 | |
126 | struct in_ifaddr; |
127 | extern void fib_add_ifaddr(struct in_ifaddr *); |
128 | |
129 | static inline void ip_rt_put(struct rtable * rt) |
130 | { |
131 | if (rt) |
132 | dst_release(&rt->u.dst); |
133 | } |
134 | |
135 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) |
136 | |
137 | extern const __u8 ip_tos2prio[16]; |
138 | |
139 | static inline char rt_tos2priority(u8 tos) |
140 | { |
141 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; |
142 | } |
143 | |
144 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, |
145 | __be32 src, u32 tos, int oif, u8 protocol, |
146 | __be16 sport, __be16 dport, struct sock *sk, |
147 | int flags) |
148 | { |
149 | struct flowi fl = { .oif = oif, |
150 | .mark = sk->sk_mark, |
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 | struct net *net = sock_net(sk); |
161 | |
162 | if (inet_sk(sk)->transparent) |
163 | fl.flags |= FLOWI_FLAG_ANYSRC; |
164 | |
165 | if (!dst || !src) { |
166 | err = __ip_route_output_key(net, rp, &fl); |
167 | if (err) |
168 | return err; |
169 | fl.fl4_dst = (*rp)->rt_dst; |
170 | fl.fl4_src = (*rp)->rt_src; |
171 | ip_rt_put(*rp); |
172 | *rp = NULL; |
173 | } |
174 | security_sk_classify_flow(sk, &fl); |
175 | return ip_route_output_flow(net, rp, &fl, sk, flags); |
176 | } |
177 | |
178 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, |
179 | __be16 sport, __be16 dport, struct sock *sk) |
180 | { |
181 | if (sport != (*rp)->fl.fl_ip_sport || |
182 | dport != (*rp)->fl.fl_ip_dport) { |
183 | struct flowi fl; |
184 | |
185 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); |
186 | fl.fl_ip_sport = sport; |
187 | fl.fl_ip_dport = dport; |
188 | fl.proto = protocol; |
189 | ip_rt_put(*rp); |
190 | *rp = NULL; |
191 | security_sk_classify_flow(sk, &fl); |
192 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); |
193 | } |
194 | return 0; |
195 | } |
196 | |
197 | extern void rt_bind_peer(struct rtable *rt, int create); |
198 | |
199 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) |
200 | { |
201 | if (rt->peer) |
202 | return rt->peer; |
203 | |
204 | rt_bind_peer(rt, 0); |
205 | return rt->peer; |
206 | } |
207 | |
208 | static inline int inet_iif(const struct sk_buff *skb) |
209 | { |
210 | return skb_rtable(skb)->rt_iif; |
211 | } |
212 | |
213 | #endif /* _ROUTE_H */ |
214 |
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