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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 | ||
116 | extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src, | |
117 | u8 tos, struct net_device *devin, bool noref); | |
118 | ||
119 | static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, | |
120 | u8 tos, struct net_device *devin) | |
121 | { | |
122 | return ip_route_input_common(skb, dst, src, tos, devin, false); | |
123 | } | |
124 | ||
125 | static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, | |
126 | u8 tos, struct net_device *devin) | |
127 | { | |
128 | return ip_route_input_common(skb, dst, src, tos, devin, true); | |
129 | } | |
130 | ||
131 | extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev); | |
132 | extern void ip_rt_send_redirect(struct sk_buff *skb); | |
133 | ||
134 | extern unsigned inet_addr_type(struct net *net, __be32 addr); | |
135 | extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr); | |
136 | extern void ip_rt_multicast_event(struct in_device *); | |
137 | extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg); | |
138 | extern void ip_rt_get_source(u8 *src, struct rtable *rt); | |
139 | extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
140 | ||
141 | struct in_ifaddr; | |
142 | extern void fib_add_ifaddr(struct in_ifaddr *); | |
143 | ||
144 | static inline void ip_rt_put(struct rtable * rt) | |
145 | { | |
146 | if (rt) | |
147 | dst_release(&rt->u.dst); | |
148 | } | |
149 | ||
150 | #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) | |
151 | ||
152 | extern const __u8 ip_tos2prio[16]; | |
153 | ||
154 | static inline char rt_tos2priority(u8 tos) | |
155 | { | |
156 | return ip_tos2prio[IPTOS_TOS(tos)>>1]; | |
157 | } | |
158 | ||
159 | static inline int ip_route_connect(struct rtable **rp, __be32 dst, | |
160 | __be32 src, u32 tos, int oif, u8 protocol, | |
161 | __be16 sport, __be16 dport, struct sock *sk, | |
162 | int flags) | |
163 | { | |
164 | struct flowi fl = { .oif = oif, | |
165 | .mark = sk->sk_mark, | |
166 | .nl_u = { .ip4_u = { .daddr = dst, | |
167 | .saddr = src, | |
168 | .tos = tos } }, | |
169 | .proto = protocol, | |
170 | .uli_u = { .ports = | |
171 | { .sport = sport, | |
172 | .dport = dport } } }; | |
173 | ||
174 | int err; | |
175 | struct net *net = sock_net(sk); | |
176 | ||
177 | if (inet_sk(sk)->transparent) | |
178 | fl.flags |= FLOWI_FLAG_ANYSRC; | |
179 | ||
180 | if (!dst || !src) { | |
181 | err = __ip_route_output_key(net, rp, &fl); | |
182 | if (err) | |
183 | return err; | |
184 | fl.fl4_dst = (*rp)->rt_dst; | |
185 | fl.fl4_src = (*rp)->rt_src; | |
186 | ip_rt_put(*rp); | |
187 | *rp = NULL; | |
188 | } | |
189 | security_sk_classify_flow(sk, &fl); | |
190 | return ip_route_output_flow(net, rp, &fl, sk, flags); | |
191 | } | |
192 | ||
193 | static inline int ip_route_newports(struct rtable **rp, u8 protocol, | |
194 | __be16 sport, __be16 dport, struct sock *sk) | |
195 | { | |
196 | if (sport != (*rp)->fl.fl_ip_sport || | |
197 | dport != (*rp)->fl.fl_ip_dport) { | |
198 | struct flowi fl; | |
199 | ||
200 | memcpy(&fl, &(*rp)->fl, sizeof(fl)); | |
201 | fl.fl_ip_sport = sport; | |
202 | fl.fl_ip_dport = dport; | |
203 | fl.proto = protocol; | |
204 | ip_rt_put(*rp); | |
205 | *rp = NULL; | |
206 | security_sk_classify_flow(sk, &fl); | |
207 | return ip_route_output_flow(sock_net(sk), rp, &fl, sk, 0); | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
212 | extern void rt_bind_peer(struct rtable *rt, int create); | |
213 | ||
214 | static inline struct inet_peer *rt_get_peer(struct rtable *rt) | |
215 | { | |
216 | if (rt->peer) | |
217 | return rt->peer; | |
218 | ||
219 | rt_bind_peer(rt, 0); | |
220 | return rt->peer; | |
221 | } | |
222 | ||
223 | static inline int inet_iif(const struct sk_buff *skb) | |
224 | { | |
225 | return skb_rtable(skb)->rt_iif; | |
226 | } | |
227 | ||
228 | #endif /* _ROUTE_H */ |