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.
6 * Definitions for the IP router.
8 * Version: @(#)route.h 1.0.4 05/27/93
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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
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.
27 #include <linux/config.h>
29 #include <net/inetpeer.h>
31 #include <linux/in_route.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/route.h>
35 #include <linux/cache.h>
36 #include <linux/vs_context.h>
37 #include <linux/vs_network.h>
40 #warning This file is not supposed to be used outside of kernel.
43 #define RTO_ONLINK 0x01
46 /* RTO_CONN is not used (being alias for 0), but preserved not to break
47 * some modules referring to it. */
49 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sk->sk_localroute)
57 struct rtable *rt_next;
60 struct in_device *idev;
65 __u32 rt_dst; /* Path destination */
66 __u32 rt_src; /* Path source */
69 /* Info on neighbour */
72 /* Cache lookup keys */
75 /* Miscellaneous cached information */
76 __u32 rt_spec_dst; /* RFC1122 specific destination */
77 struct inet_peer *peer; /* long-living peer info */
91 unsigned int in_slow_tot;
92 unsigned int in_slow_mc;
93 unsigned int in_no_route;
95 unsigned int in_martian_dst;
96 unsigned int in_martian_src;
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;
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++)
112 extern struct ip_rt_acct *ip_rt_acct;
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);
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);
133 static inline void ip_rt_put(struct rtable * rt)
136 dst_release(&rt->u.dst);
139 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
141 extern __u8 ip_tos2prio[16];
143 static inline char rt_tos2priority(u8 tos)
145 return ip_tos2prio[IPTOS_TOS(tos)>>1];
148 #define IPI_LOOPBACK 0x0100007f
150 static inline int ip_find_src(struct nx_info *nxi, struct rtable **rp, struct flowi *fl)
153 int i, n = nxi->nbipv4;
154 u32 ipv4root = nxi->ipv4[0];
159 if (fl->fl4_src == 0) {
163 err = __ip_route_output_key(rp, fl);
165 fl->fl4_src = ipv4root;
166 err = __ip_route_output_key(rp, fl);
171 foundsrc = (*rp)->rt_src;
175 u32 mask = nxi->mask[i];
176 u32 ipv4 = nxi->ipv4[i];
177 u32 net4 = ipv4 & mask;
179 if (foundsrc == ipv4) {
183 if (!fl->fl4_src && (foundsrc & mask) == net4)
187 if (fl->fl4_src == 0)
188 fl->fl4_src = (fl->fl4_dst == IPI_LOOPBACK)
189 ? IPI_LOOPBACK : ipv4root;
191 for (i=0; i<n; i++) {
192 if (nxi->ipv4[i] == fl->fl4_src)
201 static inline int ip_route_connect(struct rtable **rp, u32 dst,
202 u32 src, u32 tos, int oif, u8 protocol,
203 u16 sport, u16 dport, struct sock *sk)
205 struct flowi fl = { .oif = oif,
206 .nl_u = { .ip4_u = { .daddr = dst,
212 .dport = dport } } };
215 struct nx_info *nx_info = current->nx_info;
218 nx_info = sk->sk_nx_info;
219 vxdprintk(VXD_CBIT(net, 4),
220 "ip_route_connect(%p) %p,%p;%lx",
221 sk, nx_info, sk->sk_socket,
222 (sk->sk_socket?sk->sk_socket->flags:0));
225 err = ip_find_src(nx_info, rp, &fl);
228 if (fl.fl4_dst == IPI_LOOPBACK && !vx_check(0, VX_ADMIN))
229 fl.fl4_dst = nx_info->ipv4[0];
231 if (!fl.fl4_dst || !fl.fl4_src) {
232 err = __ip_route_output_key(rp, &fl);
235 fl.fl4_dst = (*rp)->rt_dst;
236 fl.fl4_src = (*rp)->rt_src;
240 return ip_route_output_flow(rp, &fl, sk, 0);
243 static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
246 if (sport != (*rp)->fl.fl_ip_sport ||
247 dport != (*rp)->fl.fl_ip_dport) {
250 memcpy(&fl, &(*rp)->fl, sizeof(fl));
251 fl.fl_ip_sport = sport;
252 fl.fl_ip_dport = dport;
255 return ip_route_output_flow(rp, &fl, sk, 0);
260 extern void rt_bind_peer(struct rtable *rt, int create);
262 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
271 #endif /* _ROUTE_H */