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
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_network.h>
39 #warning This file is not supposed to be used outside of kernel.
42 #define RTO_ONLINK 0x01
45 /* RTO_CONN is not used (being alias for 0), but preserved not to break
46 * some modules referring to it. */
48 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
57 struct rtable *rt_next;
60 struct in_device *idev;
64 __u16 rt_multipath_alg;
66 __u32 rt_dst; /* Path destination */
67 __u32 rt_src; /* Path source */
70 /* Info on neighbour */
73 /* Cache lookup keys */
76 /* Miscellaneous cached information */
77 __u32 rt_spec_dst; /* RFC1122 specific destination */
78 struct inet_peer *peer; /* long-living peer info */
92 unsigned int in_slow_tot;
93 unsigned int in_slow_mc;
94 unsigned int in_no_route;
96 unsigned int in_martian_dst;
97 unsigned int in_martian_src;
99 unsigned int out_slow_tot;
100 unsigned int out_slow_mc;
101 unsigned int gc_total;
102 unsigned int gc_ignored;
103 unsigned int gc_goal_miss;
104 unsigned int gc_dst_overflow;
105 unsigned int in_hlist_search;
106 unsigned int out_hlist_search;
109 extern struct rt_cache_stat *rt_cache_stat;
110 #define RT_CACHE_STAT_INC(field) \
111 (per_cpu_ptr(rt_cache_stat, _smp_processor_id())->field++)
113 extern struct ip_rt_acct *ip_rt_acct;
116 extern int ip_rt_init(void);
117 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
118 u32 src, u8 tos, struct net_device *dev);
119 extern void ip_rt_advice(struct rtable **rp, int advice);
120 extern void rt_cache_flush(int how);
121 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
122 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
123 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
124 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
125 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
126 extern void ip_rt_send_redirect(struct sk_buff *skb);
128 extern unsigned inet_addr_type(u32 addr);
129 extern void ip_rt_multicast_event(struct in_device *);
130 extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
131 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
132 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
134 static inline void ip_rt_put(struct rtable * rt)
137 dst_release(&rt->u.dst);
140 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
142 extern __u8 ip_tos2prio[16];
144 static inline char rt_tos2priority(u8 tos)
146 return ip_tos2prio[IPTOS_TOS(tos)>>1];
149 #define IPI_LOOPBACK 0x0100007f
151 static inline int ip_find_src(struct nx_info *nxi, struct rtable **rp, struct flowi *fl)
154 int i, n = nxi->nbipv4;
155 u32 ipv4root = nxi->ipv4[0];
160 if (fl->fl4_src == 0) {
164 err = __ip_route_output_key(rp, fl);
166 fl->fl4_src = ipv4root;
167 err = __ip_route_output_key(rp, fl);
172 foundsrc = (*rp)->rt_src;
176 u32 mask = nxi->mask[i];
177 u32 ipv4 = nxi->ipv4[i];
178 u32 net4 = ipv4 & mask;
180 if (foundsrc == ipv4) {
184 if (!fl->fl4_src && (foundsrc & mask) == net4)
188 if (fl->fl4_src == 0)
189 fl->fl4_src = (fl->fl4_dst == IPI_LOOPBACK)
190 ? IPI_LOOPBACK : ipv4root;
192 for (i=0; i<n; i++) {
193 if (nxi->ipv4[i] == fl->fl4_src)
202 static inline int ip_route_connect(struct rtable **rp, u32 dst,
203 u32 src, u32 tos, int oif, u8 protocol,
204 u16 sport, u16 dport, struct sock *sk)
206 struct flowi fl = { .oif = oif,
207 .nl_u = { .ip4_u = { .daddr = dst,
213 .dport = dport } } };
216 struct nx_info *nx_info = current->nx_info;
219 nx_info = sk->sk_nx_info;
220 vxdprintk(VXD_CBIT(net, 4),
221 "ip_route_connect(%p) %p,%p;%lx",
222 sk, nx_info, sk->sk_socket,
223 (sk->sk_socket?sk->sk_socket->flags:0));
226 err = ip_find_src(nx_info, rp, &fl);
229 if (fl.fl4_dst == IPI_LOOPBACK && !vx_check(0, VX_ADMIN))
230 fl.fl4_dst = nx_info->ipv4[0];
232 if (!fl.fl4_dst || !fl.fl4_src) {
233 err = __ip_route_output_key(rp, &fl);
236 fl.fl4_dst = (*rp)->rt_dst;
237 fl.fl4_src = (*rp)->rt_src;
241 return ip_route_output_flow(rp, &fl, sk, 0);
244 static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
247 if (sport != (*rp)->fl.fl_ip_sport ||
248 dport != (*rp)->fl.fl_ip_dport) {
251 memcpy(&fl, &(*rp)->fl, sizeof(fl));
252 fl.fl_ip_sport = sport;
253 fl.fl_ip_dport = dport;
256 return ip_route_output_flow(rp, &fl, sk, 0);
261 extern void rt_bind_peer(struct rtable *rt, int create);
263 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
272 #endif /* _ROUTE_H */