rtread_proc.c
上传用户:xiaozhuqw
上传日期:2009-11-15
资源大小:1338k
文件大小:4k
- /*
- * Kernel routing readup by /proc filesystem
- * Copyright (C) 1997 Kunihiro Ishiguro
- *
- * This file is part of GNU Zebra.
- *
- * GNU Zebra 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, or (at your option) any
- * later version.
- *
- * GNU Zebra is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Zebra; see the file COPYING. If not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
- #include <zebra.h>
- #include "prefix.h"
- #include "log.h"
- #include "if.h"
- #include "rib.h"
- /* Proc file system to read IPv4 routing table. */
- #ifndef _PATH_PROCNET_ROUTE
- #define _PATH_PROCNET_ROUTE "/proc/net/route"
- #endif /* _PATH_PROCNET_ROUTE */
- /* Proc file system to read IPv6 routing table. */
- #ifndef _PATH_PROCNET_ROUTE6
- #define _PATH_PROCNET_ROUTE6 "/proc/net/ipv6_route"
- #endif /* _PATH_PROCNET_ROUTE6 */
- /* To read interface's name */
- #define INTERFACE_NAMSIZ 20
- /* Reading buffer for one routing entry. */
- #define RT_BUFSIZ 1024
- /* Kernel routing table read up by /proc filesystem. */
- int
- proc_route_read ()
- {
- FILE *fp;
- char buf[RT_BUFSIZ];
- char iface[INTERFACE_NAMSIZ], dest[9], gate[9], mask[9];
- int flags, refcnt, use, metric, mtu, window, rtt;
- /* Open /proc filesystem */
- fp = fopen (_PATH_PROCNET_ROUTE, "r");
- if (fp == NULL)
- {
- zlog_warn ("Can't open %s : %sn", _PATH_PROCNET_ROUTE, strerror (errno));
- return -1;
- }
-
- /* Drop first label line. */
- fgets (buf, RT_BUFSIZ, fp);
- while (fgets (buf, RT_BUFSIZ, fp) != NULL)
- {
- int n;
- struct prefix_ipv4 p;
- struct in_addr tmpmask;
- struct in_addr gateway;
- u_char zebra_flags = 0;
- n = sscanf (buf, "%s %s %s %x %d %d %d %s %d %d %d",
- iface, dest, gate, &flags, &refcnt, &use, &metric,
- mask, &mtu, &window, &rtt);
- if (n != 11)
- {
- zlog_warn ("can't read all of routing informationn");
- continue;
- }
- if (! (flags & RTF_UP))
- continue;
- if (! (flags & RTF_GATEWAY))
- continue;
- if (flags & RTF_DYNAMIC)
- zebra_flags |= ZEBRA_FLAG_SELFROUTE;
- p.family = AF_INET;
- sscanf (dest, "%lX", (unsigned long *)&p.prefix);
- sscanf (mask, "%lX", (unsigned long *)&tmpmask);
- p.prefixlen = ip_masklen (tmpmask);
- sscanf (gate, "%lX", (unsigned long *)&gateway);
- rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, 0, 0, 0, 0);
- }
- return 0;
- }
- #ifdef HAVE_IPV6
- int
- proc_ipv6_route_read ()
- {
- FILE *fp;
- char buf [RT_BUFSIZ];
- /* Open /proc filesystem */
- fp = fopen (_PATH_PROCNET_ROUTE6, "r");
- if (fp == NULL)
- {
- zlog_warn ("Can't open %s : %s", _PATH_PROCNET_ROUTE6,
- strerror (errno));
- return -1;
- }
-
- /* There is no title line, so we don't drop first line. */
- while (fgets (buf, RT_BUFSIZ, fp) != NULL)
- {
- int n;
- char dest[33], src[33], gate[33];
- char iface[INTERFACE_NAMSIZ];
- int dest_plen, src_plen;
- int metric, use, refcnt, flags;
- struct prefix_ipv6 p;
- struct in6_addr gateway;
- u_char zebra_flags = 0;
- /* Linux 2.1.x write this information at net/ipv6/route.c
- rt6_info_node () */
- n = sscanf (buf, "%32s %02x %32s %02x %32s %08x %08x %08x %08x %s",
- dest, &dest_plen, src, &src_plen, gate,
- &metric, &use, &refcnt, &flags, iface);
- if (n != 10)
- {
- /* zlog_warn ("can't read all of routing information %dn%sn", n, buf); */
- continue;
- }
- if (! (flags & RTF_UP))
- continue;
- if (! (flags & RTF_GATEWAY))
- continue;
- if (flags & RTF_DYNAMIC)
- zebra_flags |= ZEBRA_FLAG_SELFROUTE;
- p.family = AF_INET6;
- str2in6_addr (dest, &p.prefix);
- str2in6_addr (gate, &gateway);
- p.prefixlen = dest_plen;
- rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gateway, 0, 0);
- }
- return 0;
- }
- #endif /* HAVE_IPV6 */
- void
- route_read ()
- {
- proc_route_read ();
- #ifdef HAVE_IPV6
- proc_ipv6_route_read ();
- #endif /* HAVE_IPV6 */
- }