zebra/rtread_proc.c

   1 /*
   2  * Kernel routing readup by /proc filesystem
   3  * Copyright (C) 1997 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "prefix.h"
  26 #include "log.h"
  27 #include "if.h"
  28 #include "rib.h"
  29
  30 /* Proc file system to read IPv4 routing table. */
  31 #ifndef _PATH_PROCNET_ROUTE
  32 #define _PATH_PROCNET_ROUTE      "/proc/net/route"
  33 #endif /* _PATH_PROCNET_ROUTE */
  34
  35 /* Proc file system to read IPv6 routing table. */
  36 #ifndef _PATH_PROCNET_ROUTE6
  37 #define _PATH_PROCNET_ROUTE6     "/proc/net/ipv6_route"
  38 #endif /* _PATH_PROCNET_ROUTE6 */
  39
  40 /* To read interface's name */
  41 #define INTERFACE_NAMSIZ 20
  42
  43 /* Reading buffer for one routing entry. */
  44 #define RT_BUFSIZ 1024
  45
  46 /* Kernel routing table read up by /proc filesystem. */
  47 int
  48 proc_route_read ()
  49 {
  50   FILE *fp;
  51   char buf[RT_BUFSIZ];
  52   char iface[INTERFACE_NAMSIZ], dest[9], gate[9], mask[9];
  53   int flags, refcnt, use, metric, mtu, window, rtt;
  54
  55   /* Open /proc filesystem */
  56   fp = fopen (_PATH_PROCNET_ROUTE, "r");
  57   if (fp == NULL)
  58     {
  59       zlog_warn ("Can't open %s : %s\n", _PATH_PROCNET_ROUTE, safe_strerror (errno));
  60       return -1;
  61     }
  62
  63   /* Drop first label line. */
  64   fgets (buf, RT_BUFSIZ, fp);
  65
  66   while (fgets (buf, RT_BUFSIZ, fp) != NULL)
  67     {
  68       int n;
  69       struct prefix_ipv4 p;
  70       struct in_addr tmpmask;
  71       struct in_addr gateway;
  72       u_char zebra_flags = 0;
  73
  74       n = sscanf (buf, "%s %s %s %x %d %d %d %s %d %d %d",
  75                   iface, dest, gate, &flags, &refcnt, &use, &metric,
  76                   mask, &mtu, &window, &rtt);
  77       if (n != 11)
  78         {
  79           zlog_warn ("can't read all of routing information\n");
  80           continue;
  81         }
  82       if (! (flags & RTF_UP))
  83         continue;
  84       if (! (flags & RTF_GATEWAY))
  85         continue;
  86
  87       if (flags & RTF_DYNAMIC)
  88         zebra_flags |= ZEBRA_FLAG_SELFROUTE;
  89
  90       p.family = AF_INET;
  91       sscanf (dest, "%lX", (unsigned long *)&p.prefix);
  92       sscanf (mask, "%lX", (unsigned long *)&tmpmask);
  93       p.prefixlen = ip_masklen (tmpmask);
  94       sscanf (gate, "%lX", (unsigned long *)&gateway);
  95
  96       rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, 0, 0, 0, 0);
  97     }
  98
  99   return 0;
 100 }
 101
 102 #ifdef HAVE_IPV6
 103 int
 104 proc_ipv6_route_read ()
 105 {
 106   FILE *fp;
 107   char buf [RT_BUFSIZ];
 108
 109   /* Open /proc filesystem */
 110   fp = fopen (_PATH_PROCNET_ROUTE6, "r");
 111   if (fp == NULL)
 112     {
 113       zlog_warn ("Can't open %s : %s", _PATH_PROCNET_ROUTE6,
 114                 safe_strerror (errno));
 115       return -1;
 116     }
 117
 118   /* There is no title line, so we don't drop first line.  */
 119   while (fgets (buf, RT_BUFSIZ, fp) != NULL)
 120     {
 121       int n;
 122       char dest[33], src[33], gate[33];
 123       char iface[INTERFACE_NAMSIZ];
 124       int dest_plen, src_plen;
 125       int metric, use, refcnt, flags;
 126       struct prefix_ipv6 p;
 127       struct in6_addr gateway;
 128       u_char zebra_flags = 0;
 129
 130       /* Linux 2.1.x write this information at net/ipv6/route.c
 131          rt6_info_node () */
 132       n = sscanf (buf, "%32s %02x %32s %02x %32s %08x %08x %08x %08x %s",
 133                   dest, &dest_plen, src, &src_plen, gate,
 134                   &metric, &use, &refcnt, &flags, iface);
 135
 136       if (n != 10)
 137         {
 138           /* zlog_warn ("can't read all of routing information %d\n%s\n", n, buf); */
 139           continue;
 140         }
 141
 142       if (! (flags & RTF_UP))
 143         continue;
 144       if (! (flags & RTF_GATEWAY))
 145         continue;
 146
 147       if (flags & RTF_DYNAMIC)
 148         zebra_flags |= ZEBRA_FLAG_SELFROUTE;
 149
 150       p.family = AF_INET6;
 151       str2in6_addr (dest, &p.prefix);
 152       str2in6_addr (gate, &gateway);
 153       p.prefixlen = dest_plen;
 154
 155       rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, 0, 0);
 156     }
 157
 158   return 0;
 159 }
 160 #endif /* HAVE_IPV6 */
 161
 162 void
 163 route_read ()
 164 {
 165   proc_route_read ();
 166 #ifdef HAVE_IPV6
 167   proc_ipv6_route_read ();
 168 #endif /* HAVE_IPV6 */
 169 }