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/ninline.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) | sk->sk_localroute)
56 struct rtable *rt_next;
59 struct in_device *idev;
64 __u32 rt_dst; /* Path destination */
65 __u32 rt_src; /* Path source */
68 /* Info on neighbour */
71 /* Cache lookup keys */
74 /* Miscellaneous cached information */
75 __u32 rt_spec_dst; /* RFC1122 specific destination */
76 struct inet_peer *peer; /* long-living peer info */
78 #ifdef CONFIG_IP_ROUTE_NAT
95 unsigned int in_slow_tot;
96 unsigned int in_slow_mc;
97 unsigned int in_no_route;
99 unsigned int in_martian_dst;
100 unsigned int in_martian_src;
101 unsigned int out_hit;
102 unsigned int out_slow_tot;
103 unsigned int out_slow_mc;
104 unsigned int gc_total;
105 unsigned int gc_ignored;
106 unsigned int gc_goal_miss;
107 unsigned int gc_dst_overflow;
108 unsigned int in_hlist_search;
109 unsigned int out_hlist_search;
112 extern struct rt_cache_stat *rt_cache_stat;
113 #define RT_CACHE_STAT_INC(field) \
114 (per_cpu_ptr(rt_cache_stat, smp_processor_id())->field++)
116 extern struct ip_rt_acct *ip_rt_acct;
119 extern int ip_rt_init(void);
120 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
121 u32 src, u8 tos, struct net_device *dev);
122 extern void ip_rt_advice(struct rtable **rp, int advice);
123 extern void rt_cache_flush(int how);
124 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
125 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
126 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
127 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
128 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
129 extern void ip_rt_send_redirect(struct sk_buff *skb);
131 extern unsigned inet_addr_type(u32 addr);
132 extern void ip_rt_multicast_event(struct in_device *);
133 extern int ip_rt_ioctl(unsigned int cmd, void *arg);
134 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
135 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
137 static inline void ip_rt_put(struct rtable * rt)
140 dst_release(&rt->u.dst);
143 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
145 extern __u8 ip_tos2prio[16];
147 static inline char rt_tos2priority(u8 tos)
149 return ip_tos2prio[IPTOS_TOS(tos)>>1];
152 #define IPI_LOOPBACK 0x0100007f
154 static inline int ip_find_src(struct nx_info *nxi, struct rtable **rp, struct flowi *fl)
157 int i, n = nxi->nbipv4;
158 u32 ipv4root = nxi->ipv4[0];
163 if (fl->fl4_src == 0) {
167 err = __ip_route_output_key(rp, fl);
169 fl->fl4_src = ipv4root;
170 err = __ip_route_output_key(rp, fl);
175 foundsrc = (*rp)->rt_src;
179 u32 mask = nxi->mask[i];
180 u32 ipv4 = nxi->ipv4[i];
181 u32 net4 = ipv4 & mask;
183 if (foundsrc == ipv4) {
187 if (!fl->fl4_src && (foundsrc & mask) == net4)
191 if (fl->fl4_src == 0)
192 fl->fl4_src = (fl->fl4_dst == IPI_LOOPBACK)
193 ? IPI_LOOPBACK : ipv4root;
195 for (i=0; i<n; i++) {
196 if (nxi->ipv4[i] == fl->fl4_src)
205 static inline int ip_route_connect(struct rtable **rp, u32 dst,
206 u32 src, u32 tos, int oif, u8 protocol,
207 u16 sport, u16 dport, struct sock *sk)
209 struct flowi fl = { .oif = oif,
210 .nl_u = { .ip4_u = { .daddr = dst,
216 .dport = dport } } };
219 struct nx_info *nx_info = current->nx_info;
222 nx_info = sk->sk_nx_info;
223 vxdprintk("ip_route_connect(%p) %p,%p;%lx\n",
224 sk, nx_info, sk->sk_socket,
225 (sk->sk_socket?sk->sk_socket->flags:0));
228 err = ip_find_src(nx_info, rp, &fl);
231 if (fl.fl4_dst == IPI_LOOPBACK && !vx_check(0, VX_ADMIN))
232 fl.fl4_dst = nx_info->ipv4[0];
234 if (!fl.fl4_dst || !fl.fl4_src) {
235 err = __ip_route_output_key(rp, &fl);
238 fl.fl4_dst = (*rp)->rt_dst;
239 fl.fl4_src = (*rp)->rt_src;
243 return ip_route_output_flow(rp, &fl, sk, 0);
246 static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
249 if (sport != (*rp)->fl.fl_ip_sport ||
250 dport != (*rp)->fl.fl_ip_dport) {
253 memcpy(&fl, &(*rp)->fl, sizeof(fl));
254 fl.fl_ip_sport = sport;
255 fl.fl_ip_dport = dport;
258 return ip_route_output_flow(rp, &fl, sk, 0);
263 extern void rt_bind_peer(struct rtable *rt, int create);
265 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
274 #endif /* _ROUTE_H */