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- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * Definitions for the IP router.
- *
- * Version: @(#)route.h 1.0.4 05/27/93
- *
- * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Fixes:
- * Alan Cox : Reformatted. Added ip_rt_local()
- * Alan Cox : Support for TCP parameters.
- * Alexey Kuznetsov: Major changes for new routing code.
- * Mike McLagan : Routing by source
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _ROUTE_H
- #define _ROUTE_H
-
- #include <linux/config.h>
- #include <net/dst.h>
- #include <linux/in_route.h>
- #include <linux/rtnetlink.h>
- #include <linux/route.h>
-
- #ifndef __KERNEL__
- #warning This file is not supposed to be used outside of kernel.
- #endif
-
- #define RT_HASH_DIVISOR 256
-
- /*
- * Prevents LRU trashing, entries considered equivalent,
- * if the difference between last use times is less then this number.
- */
- #define RT_CACHE_BUBBLE_THRESHOLD (5*HZ)
-
-
- #define RTO_ONLINK 0x01
- #define RTO_TPROXY 0x80000000
-
- #ifdef CONFIG_IP_TRANSPARENT_PROXY
- #define RTO_CONN RTO_TPROXY
- #else
- #define RTO_CONN 0
- #endif
-
- struct rt_key
- {
- __u32 dst;
- __u32 src;
- int iif;
- int oif;
- #ifdef CONFIG_IP_ROUTE_FWMARK
- __u32 fwmark;
- #endif
- __u8 tos;
- __u8 scope;
- };
-
- struct rtable
- {
- union
- {
- struct dst_entry dst;
- struct rtable *rt_next;
- } u;
-
- unsigned rt_flags;
- unsigned rt_type;
-
- __u32 rt_dst; /* Path destination */
- __u32 rt_src; /* Path source */
- int rt_iif;
-
- /* Info on neighbour */
- __u32 rt_gateway;
-
- /* Cache lookup keys */
- struct rt_key key;
-
- /* Miscellaneous cached information */
- __u32 rt_spec_dst; /* RFC1122 specific destination */
-
- #ifdef CONFIG_IP_ROUTE_NAT
- __u32 rt_src_map;
- __u32 rt_dst_map;
- #endif
- };
-
- extern struct rtable *rt_hash_table[RT_HASH_DIVISOR];
-
- struct ip_rt_acct
- {
- __u32 o_bytes;
- __u32 o_packets;
- __u32 i_bytes;
- __u32 i_packets;
- };
-
- extern struct ip_rt_acct ip_rt_acct[256];
-
- extern void ip_rt_init(void);
- extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
- u32 src, u8 tos, struct device *dev);
- extern void ip_rt_advice(struct rtable **rp, int advice);
- extern void rt_cache_flush(int how);
- extern int ip_route_output(struct rtable **, u32 dst, u32 src, u32 tos, int oif);
- extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct device *devin);
- extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
- extern void ip_rt_send_redirect(struct sk_buff *skb);
-
- extern unsigned inet_addr_type(u32 addr);
- extern void ip_rt_multicast_event(struct in_device *);
- extern int ip_rt_ioctl(unsigned int cmd, void *arg);
- extern void ip_rt_get_source(u8 *src, struct rtable *rt);
- extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
-
-
- extern __inline__ void ip_rt_put(struct rtable * rt)
- {
- if (rt)
- dst_release(&rt->u.dst);
- }
-
- extern __u8 ip_tos2prio[16];
-
- extern __inline__ char rt_tos2priority(u8 tos)
- {
- return ip_tos2prio[IPTOS_TOS(tos)>>1];
- }
-
- extern __inline__ int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif)
- {
- int err;
- err = ip_route_output(rp, dst, src, tos, oif);
- if (err || (dst && src))
- return err;
- dst = (*rp)->rt_dst;
- src = (*rp)->rt_src;
- ip_rt_put(*rp);
- *rp = NULL;
- return ip_route_output(rp, dst, src, tos, oif);
- }
-
- #endif /* _ROUTE_H */
-