Line data Source code
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 *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 1 :
213 : #endif /* _ROUTE_H */
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