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_base.h>
37 #include <linux/vs_context.h>
38 #include <linux/vs_network.h>
41 #warning This file is not supposed to be used outside of kernel.
44 #define RTO_ONLINK 0x01
47 /* RTO_CONN is not used (being alias for 0), but preserved not to break
48 * some modules referring to it. */
50 #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sk->sk_localroute)
58 struct rtable *rt_next;
61 struct in_device *idev;
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 */
80 #ifdef CONFIG_IP_ROUTE_NAT
97 unsigned int in_slow_tot;
98 unsigned int in_slow_mc;
99 unsigned int in_no_route;
101 unsigned int in_martian_dst;
102 unsigned int in_martian_src;
103 unsigned int out_hit;
104 unsigned int out_slow_tot;
105 unsigned int out_slow_mc;
106 unsigned int gc_total;
107 unsigned int gc_ignored;
108 unsigned int gc_goal_miss;
109 unsigned int gc_dst_overflow;
110 unsigned int in_hlist_search;
111 unsigned int out_hlist_search;
114 extern struct rt_cache_stat *rt_cache_stat;
115 #define RT_CACHE_STAT_INC(field) \
116 (per_cpu_ptr(rt_cache_stat, smp_processor_id())->field++)
118 extern struct ip_rt_acct *ip_rt_acct;
121 extern int ip_rt_init(void);
122 extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
123 u32 src, u8 tos, struct net_device *dev);
124 extern void ip_rt_advice(struct rtable **rp, int advice);
125 extern void rt_cache_flush(int how);
126 extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
127 extern int ip_route_output_key(struct rtable **, struct flowi *flp);
128 extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
129 extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
130 extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
131 extern void ip_rt_send_redirect(struct sk_buff *skb);
133 extern unsigned inet_addr_type(u32 addr);
134 extern void ip_rt_multicast_event(struct in_device *);
135 extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
136 extern void ip_rt_get_source(u8 *src, struct rtable *rt);
137 extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
139 static inline void ip_rt_put(struct rtable * rt)
142 dst_release(&rt->u.dst);
145 #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
147 extern __u8 ip_tos2prio[16];
149 static inline char rt_tos2priority(u8 tos)
151 return ip_tos2prio[IPTOS_TOS(tos)>>1];
154 #define IPI_LOOPBACK 0x0100007f
156 static inline int ip_find_src(struct nx_info *nxi, struct rtable **rp, struct flowi *fl)
159 int i, n = nxi->nbipv4;
160 u32 ipv4root = nxi->ipv4[0];
165 if (fl->fl4_src == 0) {
169 err = __ip_route_output_key(rp, fl);
171 fl->fl4_src = ipv4root;
172 err = __ip_route_output_key(rp, fl);
177 foundsrc = (*rp)->rt_src;
181 u32 mask = nxi->mask[i];
182 u32 ipv4 = nxi->ipv4[i];
183 u32 net4 = ipv4 & mask;
185 if (foundsrc == ipv4) {
189 if (!fl->fl4_src && (foundsrc & mask) == net4)
193 if (fl->fl4_src == 0)
194 fl->fl4_src = (fl->fl4_dst == IPI_LOOPBACK)
195 ? IPI_LOOPBACK : ipv4root;
197 for (i=0; i<n; i++) {
198 if (nxi->ipv4[i] == fl->fl4_src)
207 static inline int ip_route_connect(struct rtable **rp, u32 dst,
208 u32 src, u32 tos, int oif, u8 protocol,
209 u16 sport, u16 dport, struct sock *sk)
211 struct flowi fl = { .oif = oif,
212 .nl_u = { .ip4_u = { .daddr = dst,
218 .dport = dport } } };
221 struct nx_info *nx_info = current->nx_info;
224 nx_info = sk->sk_nx_info;
225 vxdprintk("ip_route_connect(%p) %p,%p;%lx\n",
226 sk, nx_info, sk->sk_socket,
227 (sk->sk_socket?sk->sk_socket->flags:0));
230 err = ip_find_src(nx_info, rp, &fl);
233 if (fl.fl4_dst == IPI_LOOPBACK && !vx_check(0, VX_ADMIN))
234 fl.fl4_dst = nx_info->ipv4[0];
236 if (!fl.fl4_dst || !fl.fl4_src) {
237 err = __ip_route_output_key(rp, &fl);
240 fl.fl4_dst = (*rp)->rt_dst;
241 fl.fl4_src = (*rp)->rt_src;
245 return ip_route_output_flow(rp, &fl, sk, 0);
248 static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
251 if (sport != (*rp)->fl.fl_ip_sport ||
252 dport != (*rp)->fl.fl_ip_dport) {
255 memcpy(&fl, &(*rp)->fl, sizeof(fl));
256 fl.fl_ip_sport = sport;
257 fl.fl_ip_dport = dport;
260 return ip_route_output_flow(rp, &fl, sk, 0);
265 extern void rt_bind_peer(struct rtable *rt, int create);
267 static inline struct inet_peer *rt_get_peer(struct rtable *rt)
276 #endif /* _ROUTE_H */