route.h
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上传日期:2013-04-10
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文件大小:5k
- /*
- * 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
- * Robert Olsson : Added rt_cache statistics
- *
- * 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 <net/inetpeer.h>
- #include <linux/in_route.h>
- #include <linux/rtnetlink.h>
- #include <linux/route.h>
- #include <linux/ip.h>
- #include <linux/cache.h>
- #ifndef __KERNEL__
- #warning This file is not supposed to be used outside of kernel.
- #endif
- #define RTO_ONLINK 0x01
- #define RTO_CONN 0
- /* RTO_CONN is not used (being alias for 0), but preserved not to break
- * some modules referring to it. */
- #define RT_CONN_FLAGS(sk) (RT_TOS(sk->protinfo.af_inet.tos) | sk->localroute)
- struct rt_key
- {
- __u32 dst;
- __u32 src;
- int iif;
- int oif;
- #ifdef CONFIG_IP_ROUTE_FWMARK
- __u32 fwmark;
- #endif
- __u8 tos;
- __u8 scope;
- };
- struct inet_peer;
- 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 */
- struct inet_peer *peer; /* long-living peer info */
- #ifdef CONFIG_IP_ROUTE_NAT
- __u32 rt_src_map;
- __u32 rt_dst_map;
- #endif
- };
- struct ip_rt_acct
- {
- __u32 o_bytes;
- __u32 o_packets;
- __u32 i_bytes;
- __u32 i_packets;
- };
- struct rt_cache_stat
- {
- unsigned int in_hit;
- unsigned int in_slow_tot;
- unsigned int in_slow_mc;
- unsigned int in_no_route;
- unsigned int in_brd;
- unsigned int in_martian_dst;
- unsigned int in_martian_src;
- unsigned int out_hit;
- unsigned int out_slow_tot;
- unsigned int out_slow_mc;
- unsigned int gc_total;
- unsigned int gc_ignored;
- unsigned int gc_goal_miss;
- unsigned int gc_dst_overflow;
- } ____cacheline_aligned_in_smp;
- extern struct ip_rt_acct *ip_rt_acct;
- struct in_device;
- extern void ip_rt_init(void);
- extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
- u32 src, u8 tos, struct net_device *dev);
- extern void ip_rt_advice(struct rtable **rp, int advice);
- extern void rt_cache_flush(int how);
- extern int ip_route_output_key(struct rtable **, const struct rt_key *key);
- extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
- extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
- extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned 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);
- /* Deprecated: use ip_route_output_key directly */
- static inline int ip_route_output(struct rtable **rp,
- u32 daddr, u32 saddr, u32 tos, int oif)
- {
- struct rt_key key = { dst:daddr, src:saddr, oif:oif, tos:tos };
- return ip_route_output_key(rp, &key);
- }
- static inline void ip_rt_put(struct rtable * rt)
- {
- if (rt)
- dst_release(&rt->u.dst);
- }
- #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
- extern __u8 ip_tos2prio[16];
- static inline char rt_tos2priority(u8 tos)
- {
- return ip_tos2prio[IPTOS_TOS(tos)>>1];
- }
- static 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);
- }
- extern void rt_bind_peer(struct rtable *rt, int create);
- static inline struct inet_peer *rt_get_peer(struct rtable *rt)
- {
- if (rt->peer)
- return rt->peer;
- rt_bind_peer(rt, 0);
- return rt->peer;
- }
- #endif /* _ROUTE_H */