LXR linux-old/include/net/route.h

   1/*
   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.
   5 *
   6 *              Definitions for the IP router.
   7 *
   8 * Version:     @(#)route.h     1.0.4   05/27/93
   9 *
  10 * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  11 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 * Fixes:
  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
  18 *
  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.
  23 */
  24#ifndef _ROUTE_H
  25#define _ROUTE_H
  26
  27#include <linux/config.h>
  28#include <net/dst.h>
  29#include <net/inetpeer.h>
  30#include <linux/in_route.h>
  31#include <linux/rtnetlink.h>
  32#include <linux/route.h>
  33#include <linux/ip.h>
  34#include <linux/cache.h>
  35
  36#ifndef __KERNEL__
  37#warning This file is not supposed to be used outside of kernel.
  38#endif
  39
  40#define RTO_ONLINK      0x01
  41
  42#define RTO_CONN        0
  43/* RTO_CONN is not used (being alias for 0), but preserved not to break
  44 * some modules referring to it. */
  45
  46#define RT_CONN_FLAGS(sk)   (RT_TOS(sk->protinfo.af_inet.tos) | sk->localroute)
  47
  48struct rt_key
  49{
  50        __u32                   dst;
  51        __u32                   src;
  52        int                     iif;
  53        int                     oif;
  54#ifdef CONFIG_IP_ROUTE_FWMARK
  55        __u32                   fwmark;
  56#endif
  57        __u8                    tos;
  58        __u8                    scope;
  59};
  60
  61struct inet_peer;
  62struct rtable
  63{
  64        union
  65        {
  66                struct dst_entry        dst;
  67                struct rtable           *rt_next;
  68        } u;
  69
  70        unsigned                rt_flags;
  71        unsigned                rt_type;
  72
  73        __u32                   rt_dst; /* Path destination     */
  74        __u32                   rt_src; /* Path source          */
  75        int                     rt_iif;
  76
  77        /* Info on neighbour */
  78        __u32                   rt_gateway;
  79
  80        /* Cache lookup keys */
  81        struct rt_key           key;
  82
  83        /* Miscellaneous cached information */
  84        __u32                   rt_spec_dst; /* RFC1122 specific destination */
  85        struct inet_peer        *peer; /* long-living peer info */
  86
  87#ifdef CONFIG_IP_ROUTE_NAT
  88        __u32                   rt_src_map;
  89        __u32                   rt_dst_map;
  90#endif
  91};
  92
  93struct ip_rt_acct
  94{
  95        __u32   o_bytes;
  96        __u32   o_packets;
  97        __u32   i_bytes;
  98        __u32   i_packets;
  99};
 100
 101struct rt_cache_stat 
 102{
 103        unsigned int in_hit;
 104        unsigned int in_slow_tot;
 105        unsigned int in_slow_mc;
 106        unsigned int in_no_route;
 107        unsigned int in_brd;
 108        unsigned int in_martian_dst;
 109        unsigned int in_martian_src;
 110        unsigned int out_hit;
 111        unsigned int out_slow_tot;
 112        unsigned int out_slow_mc;
 113        unsigned int gc_total;
 114        unsigned int gc_ignored;
 115        unsigned int gc_goal_miss;
 116        unsigned int gc_dst_overflow;
 117        unsigned int in_hlist_search;
 118        unsigned int out_hlist_search;
 119} ____cacheline_aligned_in_smp;
 120
 121extern struct ip_rt_acct *ip_rt_acct;
 122
 123struct in_device;
 124extern void             ip_rt_init(void);
 125extern void             ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
 126                                       u32 src, u8 tos, struct net_device *dev);
 127extern void             ip_rt_advice(struct rtable **rp, int advice);
 128extern void             rt_cache_flush(int how);
 129extern int              ip_route_output_key(struct rtable **, const struct rt_key *key);
 130extern int              ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
 131extern unsigned short   ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
 132extern void             ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu);
 133extern void             ip_rt_send_redirect(struct sk_buff *skb);
 134
 135extern unsigned         inet_addr_type(u32 addr);
 136extern void             ip_rt_multicast_event(struct in_device *);
 137extern int              ip_rt_ioctl(unsigned int cmd, void *arg);
 138extern void             ip_rt_get_source(u8 *src, struct rtable *rt);
 139extern int              ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);
 140
 141/* Deprecated: use ip_route_output_key directly */
 142static inline int ip_route_output(struct rtable **rp,
 143                                      u32 daddr, u32 saddr, u32 tos, int oif)
 144{
 145        struct rt_key key = { dst:daddr, src:saddr, oif:oif, tos:tos };
 146
 147        return ip_route_output_key(rp, &key);
 148}
 149
 150
 151static inline void ip_rt_put(struct rtable * rt)
 152{
 153        if (rt)
 154                dst_release(&rt->u.dst);
 155}
 156
 157#define IPTOS_RT_MASK   (IPTOS_TOS_MASK & ~3)
 158
 159extern __u8 ip_tos2prio[16];
 160
 161static inline char rt_tos2priority(u8 tos)
 162{
 163        return ip_tos2prio[IPTOS_TOS(tos)>>1];
 164}
 165
 166static inline int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif)
 167{
 168        int err;
 169        err = ip_route_output(rp, dst, src, tos, oif);
 170        if (err || (dst && src))
 171                return err;
 172        dst = (*rp)->rt_dst;
 173        src = (*rp)->rt_src;
 174        ip_rt_put(*rp);
 175        *rp = NULL;
 176        return ip_route_output(rp, dst, src, tos, oif);
 177}
 178
 179extern void rt_bind_peer(struct rtable *rt, int create);
 180
 181static inline struct inet_peer *rt_get_peer(struct rtable *rt)
 182{
 183        if (rt->peer)
 184                return rt->peer;
 185
 186        rt_bind_peer(rt, 0);
 187        return rt->peer;
 188}
 189
 190#endif  /* _ROUTE_H */
 191