From 718e3744195351130f4ce7dbe0613f4b3e23df93 Mon Sep 17 00:00:00 2001
From: paul <paul>
Date: Fri, 13 Dec 2002 20:15:29 +0000
Subject: Initial revision

---
 zebra/rtread_proc.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 zebra/rtread_proc.c

(limited to 'zebra/rtread_proc.c')

diff --git a/zebra/rtread_proc.c b/zebra/rtread_proc.c
new file mode 100644
index 00000000..320152e7
--- /dev/null
+++ b/zebra/rtread_proc.c
@@ -0,0 +1,169 @@
+/*
+ * 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 : %s\n", _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 information\n");
+	  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 %d\n%s\n", 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 */
+}
-- 
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