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jcastillo |
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the IP router.
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*
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* Version: @(#)route.h 1.0.4 05/27/93
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Fixes:
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* Alan Cox : Reformatted. Added ip_rt_local()
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* Alan Cox : Support for TCP parameters.
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* Alexey Kuznetsov: Major changes for new routing code.
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* Elliot Poger : Added support for SO_BINDTODEVICE.
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* Wolfgang Walter,
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* Daniel Ryde,
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* Ingo Molinar : fixed bug in ip_rt_put introduced
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* by SO_BINDTODEVICE support causing
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* a memory leak
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*
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* FIXME:
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* Make atomic ops more generic and hide them in asm/...
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ROUTE_H
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#define _ROUTE_H
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#include <linux/config.h>
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/*
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* 0 - no debugging messages
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* 1 - rare events and bugs situations (default)
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* 2 - trace mode.
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*/
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#define RT_CACHE_DEBUG 0
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#define RT_HASH_DIVISOR 256
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#define RT_CACHE_SIZE_MAX 256
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#define RTZ_HASH_DIVISOR 256
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#if RT_CACHE_DEBUG >= 2
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#define RTZ_HASHING_LIMIT 0
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#else
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#define RTZ_HASHING_LIMIT 16
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#endif
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/*
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* Maximal time to live for unused entry.
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*/
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#define RT_CACHE_TIMEOUT (HZ*300)
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/*
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* Prevents LRU trashing, entries considered equivalent,
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* if the difference between last use times is less then this number.
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*/
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#define RT_CACHE_BUBBLE_THRESHOLD (HZ*5)
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#include <linux/route.h>
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#ifdef __KERNEL__
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#define RTF_LOCAL 0x8000
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#endif
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struct rtable
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{
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struct rtable *rt_next;
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__u32 rt_dst;
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__u32 rt_src;
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__u32 rt_gateway;
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atomic_t rt_refcnt;
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atomic_t rt_use;
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unsigned long rt_window;
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atomic_t rt_lastuse;
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struct hh_cache *rt_hh;
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struct device *rt_dev;
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unsigned short rt_flags;
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unsigned short rt_mtu;
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unsigned short rt_irtt;
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unsigned char rt_tos;
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};
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extern void ip_rt_flush(struct device *dev);
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extern void ip_rt_update(int event, struct device *dev);
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extern void ip_rt_redirect(__u32 src, __u32 dst, __u32 gw, struct device *dev);
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extern struct rtable *ip_rt_slow_route(__u32 daddr, int local, struct device *dev);
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extern struct device *ip_rt_dev(__u32 addr);
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extern int rt_get_info(char * buffer, char **start, off_t offset, int length, int dummy);
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extern int rt_cache_get_info(char *buffer, char **start, off_t offset, int length, int dummy);
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extern int ip_rt_ioctl(unsigned int cmd, void *arg);
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extern int ip_rt_new(struct rtentry *rt);
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extern int ip_rt_kill(struct rtentry *rt);
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extern void ip_rt_check_expire(void);
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extern void ip_rt_advice(struct rtable **rp, int advice);
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extern void ip_rt_run_bh(void);
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extern atomic_t ip_rt_lock;
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extern unsigned ip_rt_bh_mask;
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extern struct rtable *ip_rt_hash_table[RT_HASH_DIVISOR];
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extern void rt_free(struct rtable * rt);
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extern __inline__ void ip_rt_fast_lock(void)
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{
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atomic_inc(&ip_rt_lock);
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}
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extern __inline__ void ip_rt_fast_unlock(void)
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{
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atomic_dec(&ip_rt_lock);
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}
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extern __inline__ void ip_rt_unlock(void)
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{
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if (atomic_dec_and_test(&ip_rt_lock) && ip_rt_bh_mask)
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ip_rt_run_bh();
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}
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extern __inline__ unsigned ip_rt_hash_code(__u32 addr)
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{
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unsigned tmp = addr + (addr>>16);
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return (tmp + (tmp>>8)) & 0xFF;
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}
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extern __inline__ void ip_rt_put(struct rtable * rt)
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#ifndef MODULE
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{
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/* If this rtable entry is not in the cache, we'd better free
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* it once the refcnt goes to zero, because nobody else will.
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*/
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if (rt&&atomic_dec_and_test(&rt->rt_refcnt)&&(rt->rt_flags&RTF_NOTCACHED))
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rt_free(rt);
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}
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#else
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;
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#endif
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#ifdef CONFIG_KERNELD
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extern struct rtable * ip_rt_route(__u32 daddr, int local, struct device *dev);
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#else
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extern __inline__ struct rtable * ip_rt_route(__u32 daddr, int local, struct device *dev)
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#ifndef MODULE
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{
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struct rtable * rth;
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ip_rt_fast_lock();
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for (rth=ip_rt_hash_table[ip_rt_hash_code(daddr)^local]; rth; rth=rth->rt_next)
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{
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/* If an interface is specified, make sure this route points to it. */
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if ( (rth->rt_dst == daddr) && ((dev==NULL) || (dev==rth->rt_dev)) )
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{
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rth->rt_lastuse = jiffies;
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atomic_inc(&rth->rt_use);
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atomic_inc(&rth->rt_refcnt);
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ip_rt_unlock();
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return rth;
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}
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}
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return ip_rt_slow_route (daddr, local, dev);
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}
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#else
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;
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#endif
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#endif
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extern __inline__ struct rtable * ip_check_route(struct rtable ** rp, __u32 daddr,
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int local, struct device *dev)
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{
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struct rtable * rt = *rp;
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if (!rt || rt->rt_dst != daddr || !(rt->rt_flags&RTF_UP) || (dev!=NULL)
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|| ((local==1)^((rt->rt_flags&RTF_LOCAL) != 0)))
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{
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ip_rt_put(rt);
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rt = ip_rt_route(daddr, local, dev);
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*rp = rt;
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}
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return rt;
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}
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#endif /* _ROUTE_H */
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