LXR linux-bk/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 <net/flow.h>
  31#include <linux/in_route.h>
  32#include <linux/rtnetlink.h>
  33#include <linux/route.h>
  34#include <linux/ip.h>
  35#include <linux/cache.h>
  36
  37#ifndef __KERNEL__
  38#warning This file is not supposed to be used outside of kernel.
  39#endif
  40
  41#define RTO_ONLINK      0x01
  42
  43#define RTO_CONN        0
  44/* RTO_CONN is not used (being alias for 0), but preserved not to break
  45 * some modules referring to it. */
  46
  47#define RT_CONN_FLAGS(sk)   (RT_TOS(inet_sk(sk)->tos) | sk->sk_localroute)
  48
  49struct inet_peer;
  50struct rtable
  51{
  52        union
  53        {
  54                struct dst_entry        dst;
  55                struct rtable           *rt_next;
  56        } u;
  57
  58        unsigned                rt_flags;
  59        unsigned                rt_type;
  60
  61        __u32                   rt_dst; /* Path destination     */
  62        __u32                   rt_src; /* Path source          */
  63        int                     rt_iif;
  64
  65        /* Info on neighbour */
  66        __u32                   rt_gateway;
  67
  68        /* Cache lookup keys */
  69        struct flowi            fl;
  70
  71        /* Miscellaneous cached information */
  72        __u32                   rt_spec_dst; /* RFC1122 specific destination */
  73        struct inet_peer        *peer; /* long-living peer info */
  74
  75#ifdef CONFIG_IP_ROUTE_NAT
  76        __u32                   rt_src_map;
  77        __u32                   rt_dst_map;
  78#endif
  79};
  80
  81struct ip_rt_acct
  82{
  83        __u32   o_bytes;
  84        __u32   o_packets;
  85        __u32   i_bytes;
  86        __u32   i_packets;
  87};
  88
  89struct rt_cache_stat 
  90{
  91        unsigned int in_hit;
  92        unsigned int in_slow_tot;
  93        unsigned int in_slow_mc;
  94        unsigned int in_no_route;
  95        unsigned int in_brd;
  96        unsigned int in_martian_dst;
  97        unsigned int in_martian_src;
  98        unsigned int out_hit;
  99        unsigned int out_slow_tot;
 100        unsigned int out_slow_mc;
 101        unsigned int gc_total;
 102        unsigned int gc_ignored;
 103        unsigned int gc_goal_miss;
 104        unsigned int gc_dst_overflow;
 105        unsigned int in_hlist_search;
 106        unsigned int out_hlist_search;
 107};
 108
 109extern struct rt_cache_stat *rt_cache_stat;
 110#define RT_CACHE_STAT_INC(field)                                          \
 111                (per_cpu_ptr(rt_cache_stat, smp_processor_id())->field++)
 112
 113extern struct ip_rt_acct *ip_rt_acct;
 114
 115struct in_device;
 116extern int              ip_rt_init(void);
 117extern void             ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
 118                                       u32 src, u8 tos, struct net_device *dev);
 119extern void             ip_rt_advice(struct rtable **rp, int advice);
 120extern void             rt_cache_flush(int how);
 121extern int              __ip_route_output_key(struct rtable **, const struct flowi *flp);
 122extern int              ip_route_output_key(struct rtable **, struct flowi *flp);
 123extern int              ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
 124extern int              ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
 125extern unsigned short   ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
 126extern void             ip_rt_send_redirect(struct sk_buff *skb);
 127
 128extern unsigned         inet_addr_type(u32 addr);
 129extern void             ip_rt_multicast_event(struct in_device *);
 130extern int              ip_rt_ioctl(unsigned int cmd, void *arg);
 131extern void             ip_rt_get_source(u8 *src, struct rtable *rt);
 132extern int              ip_rt_dump(struct sk_buff *skb,  struct netlink_callback *cb);
 133
 134static inline void ip_rt_put(struct rtable * rt)
 135{
 136        if (rt)
 137                dst_release(&rt->u.dst);
 138}
 139
 140#define IPTOS_RT_MASK   (IPTOS_TOS_MASK & ~3)
 141
 142extern __u8 ip_tos2prio[16];
 143
 144static inline char rt_tos2priority(u8 tos)
 145{
 146        return ip_tos2prio[IPTOS_TOS(tos)>>1];
 147}
 148
 149static inline int ip_route_connect(struct rtable **rp, u32 dst,
 150                                   u32 src, u32 tos, int oif, u8 protocol,
 151                                   u16 sport, u16 dport, struct sock *sk)
 152{
 153        struct flowi fl = { .oif = oif,
 154                            .nl_u = { .ip4_u = { .daddr = dst,
 155                                                 .saddr = src,
 156                                                 .tos   = tos } },
 157                            .proto = protocol,
 158                            .uli_u = { .ports =
 159                                       { .sport = sport,
 160                                         .dport = dport } } };
 161
 162        int err;
 163        if (!dst || !src) {
 164                err = __ip_route_output_key(rp, &fl);
 165                if (err)
 166                        return err;
 167                fl.fl4_dst = (*rp)->rt_dst;
 168                fl.fl4_src = (*rp)->rt_src;
 169                ip_rt_put(*rp);
 170                *rp = NULL;
 171        }
 172        return ip_route_output_flow(rp, &fl, sk, 0);
 173}
 174
 175static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
 176                                    struct sock *sk)
 177{
 178        if (sport != (*rp)->fl.fl_ip_sport ||
 179            dport != (*rp)->fl.fl_ip_dport) {
 180                struct flowi fl;
 181
 182                memcpy(&fl, &(*rp)->fl, sizeof(fl));
 183                fl.fl_ip_sport = sport;
 184                fl.fl_ip_dport = dport;
 185                ip_rt_put(*rp);
 186                *rp = NULL;
 187                return ip_route_output_flow(rp, &fl, sk, 0);
 188        }
 189        return 0;
 190}
 191
 192extern void rt_bind_peer(struct rtable *rt, int create);
 193
 194static inline struct inet_peer *rt_get_peer(struct rtable *rt)
 195{
 196        if (rt->peer)
 197                return rt->peer;
 198
 199        rt_bind_peer(rt, 0);
 200        return rt->peer;
 201}
 202
 203#endif  /* _ROUTE_H */
 204