Annotation of embedaddon/quagga/zebra/rtread_proc.c, revision 1.1

1.1     ! misho       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: #include "zebra/zserv.h"
        !            31: #include "zebra/rt.h"
        !            32: 
        !            33: /* Proc file system to read IPv4 routing table. */
        !            34: #ifndef _PATH_PROCNET_ROUTE
        !            35: #define _PATH_PROCNET_ROUTE      "/proc/net/route"
        !            36: #endif /* _PATH_PROCNET_ROUTE */
        !            37: 
        !            38: /* Proc file system to read IPv6 routing table. */
        !            39: #ifndef _PATH_PROCNET_ROUTE6
        !            40: #define _PATH_PROCNET_ROUTE6     "/proc/net/ipv6_route"
        !            41: #endif /* _PATH_PROCNET_ROUTE6 */
        !            42: 
        !            43: /* To read interface's name */
        !            44: #define INTERFACE_NAMSIZ 20  
        !            45: 
        !            46: /* Reading buffer for one routing entry. */
        !            47: #define RT_BUFSIZ 1024
        !            48: 
        !            49: /* Kernel routing table read up by /proc filesystem. */
        !            50: static int
        !            51: proc_route_read (void)
        !            52: {
        !            53:   FILE *fp;
        !            54:   char buf[RT_BUFSIZ];
        !            55:   char iface[INTERFACE_NAMSIZ], dest[9], gate[9], mask[9];
        !            56:   int flags, refcnt, use, metric, mtu, window, rtt;
        !            57: 
        !            58:   /* Open /proc filesystem */
        !            59:   fp = fopen (_PATH_PROCNET_ROUTE, "r");
        !            60:   if (fp == NULL)
        !            61:     {
        !            62:       zlog_warn ("Can't open %s : %s\n", _PATH_PROCNET_ROUTE, safe_strerror (errno));
        !            63:       return -1;
        !            64:     }
        !            65:   
        !            66:   /* Drop first label line. */
        !            67:   fgets (buf, RT_BUFSIZ, fp);
        !            68: 
        !            69:   while (fgets (buf, RT_BUFSIZ, fp) != NULL)
        !            70:     {
        !            71:       int n;
        !            72:       struct prefix_ipv4 p;
        !            73:       struct in_addr tmpmask;
        !            74:       struct in_addr gateway;
        !            75:       u_char zebra_flags = 0;
        !            76: 
        !            77:       n = sscanf (buf, "%s %s %s %x %d %d %d %s %d %d %d",
        !            78:                  iface, dest, gate, &flags, &refcnt, &use, &metric, 
        !            79:                  mask, &mtu, &window, &rtt);
        !            80:       if (n != 11)
        !            81:        {       
        !            82:          zlog_warn ("can't read all of routing information\n");
        !            83:          continue;
        !            84:        }
        !            85:       if (! (flags & RTF_UP))
        !            86:        continue;
        !            87:       if (! (flags & RTF_GATEWAY))
        !            88:        continue;
        !            89: 
        !            90:       if (flags & RTF_DYNAMIC)
        !            91:        zebra_flags |= ZEBRA_FLAG_SELFROUTE;
        !            92: 
        !            93:       p.family = AF_INET;
        !            94:       sscanf (dest, "%lX", (unsigned long *)&p.prefix);
        !            95:       sscanf (mask, "%lX", (unsigned long *)&tmpmask);
        !            96:       p.prefixlen = ip_masklen (tmpmask);
        !            97:       sscanf (gate, "%lX", (unsigned long *)&gateway);
        !            98: 
        !            99:       rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, NULL, 0, 0, 0, 0);
        !           100:     }
        !           101: 
        !           102:   fclose (fp);
        !           103:   return 0;
        !           104: }
        !           105: 
        !           106: #ifdef HAVE_IPV6
        !           107: static int
        !           108: proc_ipv6_route_read ()
        !           109: {
        !           110:   FILE *fp;
        !           111:   char buf [RT_BUFSIZ];
        !           112: 
        !           113:   /* Open /proc filesystem */
        !           114:   fp = fopen (_PATH_PROCNET_ROUTE6, "r");
        !           115:   if (fp == NULL)
        !           116:     {
        !           117:       zlog_warn ("Can't open %s : %s", _PATH_PROCNET_ROUTE6, 
        !           118:                safe_strerror (errno));
        !           119:       return -1;
        !           120:     }
        !           121:   
        !           122:   /* There is no title line, so we don't drop first line.  */
        !           123:   while (fgets (buf, RT_BUFSIZ, fp) != NULL)
        !           124:     {
        !           125:       int n;
        !           126:       char dest[33], src[33], gate[33];
        !           127:       char iface[INTERFACE_NAMSIZ];
        !           128:       int dest_plen, src_plen;
        !           129:       int metric, use, refcnt, flags;
        !           130:       struct prefix_ipv6 p;
        !           131:       struct in6_addr gateway;
        !           132:       u_char zebra_flags = 0;
        !           133: 
        !           134:       /* Linux 2.1.x write this information at net/ipv6/route.c
        !           135:          rt6_info_node () */
        !           136:       n = sscanf (buf, "%32s %02x %32s %02x %32s %08x %08x %08x %08x %s",
        !           137:                  dest, &dest_plen, src, &src_plen, gate,
        !           138:                  &metric, &use, &refcnt, &flags, iface);
        !           139: 
        !           140:       if (n != 10)
        !           141:        {       
        !           142:          /* zlog_warn ("can't read all of routing information %d\n%s\n", n, buf); */
        !           143:          continue;
        !           144:        }
        !           145: 
        !           146:       if (! (flags & RTF_UP))
        !           147:        continue;
        !           148:       if (! (flags & RTF_GATEWAY))
        !           149:        continue;
        !           150: 
        !           151:       if (flags & RTF_DYNAMIC)
        !           152:        zebra_flags |= ZEBRA_FLAG_SELFROUTE;
        !           153: 
        !           154:       p.family = AF_INET6;
        !           155:       str2in6_addr (dest, &p.prefix);
        !           156:       str2in6_addr (gate, &gateway);
        !           157:       p.prefixlen = dest_plen;
        !           158: 
        !           159:       rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, 0, 0,
        !           160:                    metric, 0);
        !           161:     }
        !           162: 
        !           163:   fclose (fp);
        !           164:   return 0;
        !           165: }
        !           166: #endif /* HAVE_IPV6 */
        !           167: 
        !           168: void
        !           169: route_read (void)
        !           170: {
        !           171:   proc_route_read ();
        !           172: #ifdef HAVE_IPV6
        !           173:   proc_ipv6_route_read ();
        !           174: #endif /* HAVE_IPV6 */
        !           175: }

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