[LARTC] [RFC] Controlling the auto-route setting behaviour of the

[Sven Anders <anders@anduras.de>]

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Hello!

I implemented a patch to control the behaviour of the kernel when setting routes
automatically when adding a new network address.

You can select the types of routes you want to be set automatically.

This enables the user - as an example - to set all routes in the local table
automatically, but leave the main table untouched. (This is the special case I
needed.)
If you want you can disable it completly by writing 0 to
 /proc/sys/net/ipv4/ip_autoroute.

I would like to see this in the kernel, but nobody on the netdev mailing list
seems to care. Any comments or ideas about this? Stephen?


Regards
 Sven

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 Sven Anders <anders@anduras.de>                 () Ascii Ribbon Campaign
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--- linux-2.6.15.1/include/linux/sysctl.h	Sun Jan 15 07:16:02 2006
+++ linux-2.6.15.1/include/linux/sysctl.h.patched	Tue Jan 31 21:43:58 2006
@@ -390,6 +390,7 @@
 	NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR=109,
 	NET_TCP_CONG_CONTROL=110,
 	NET_TCP_ABC=111,
+	NET_IPV4_AUTO_ROUTE_CREATE=112,
 };
 
 enum {
--- linux-2.6.15.1/net/ipv4/sysctl_net_ipv4.c	Sun Jan 15 07:16:02 2006
+++ linux-2.6.15.1/net/ipv4/sysctl_net_ipv4.c.patched	Tue Jan 31 21:53:14 2006
@@ -18,12 +18,15 @@
 #include <net/route.h>
 #include <net/tcp.h>
 
 /* From af_inet.c */
 extern int sysctl_ip_nonlocal_bind;
 
+/* From fib_frontend.c */
+extern int sysctl_auto_route_create;
+
 #ifdef CONFIG_SYSCTL
 static int tcp_retr1_max = 255; 
 static int ip_local_port_range_min[] = { 1, 1 };
 static int ip_local_port_range_max[] = { 65535, 65535 };
 #endif
 
@@ -646,12 +649,20 @@
 		.strategy	= &sysctl_tcp_congestion_control,
 	},
 	{
 		.ctl_name	= NET_TCP_ABC,
 		.procname	= "tcp_abc",
 		.data		= &sysctl_tcp_abc,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= NET_IPV4_AUTO_ROUTE_CREATE,
+		.procname	= "ip_autoroute",
+		.data		= &sysctl_auto_route_create,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
 
 	{ .ctl_name = 0 }
--- linux-2.6.15.1/net/ipv4/fib_frontend.c	Tue Jan 31 21:46:19 2006
+++ linux-2.6.15.1/net/ipv4/fib_frontend.c.patched	Wed Feb  1 23:13:51 2006
@@ -47,6 +47,13 @@
 
 #define FFprint(a...) printk(KERN_DEBUG a)
 
+/* automatically create routes? */
+#define SYSCTL_AUTO_ROUTE_LOCAL     1
+#define SYSCTL_AUTO_ROUTE_BROADCAST 2
+#define SYSCTL_AUTO_ROUTE_UNICAST   4
+#define SYSCTL_AUTO_ROUTE_ALL       7
+int sysctl_auto_route_create = SYSCTL_AUTO_ROUTE_ALL;
+
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
 #define RT_TABLE_MIN RT_TABLE_MAIN
@@ -373,6 +380,14 @@
 		struct rtmsg	rtm;
 	} req;
 	struct kern_rta rta;
+
+	if (((type == RTN_LOCAL) &&
+	     !(sysctl_auto_route_create & SYSCTL_AUTO_ROUTE_LOCAL)) ||
+	    ((type == RTN_BROADCAST) &&
+	     !(sysctl_auto_route_create & SYSCTL_AUTO_ROUTE_BROADCAST)) ||
+	    ((type == RTN_UNICAST) &&
+	     !(sysctl_auto_route_create & SYSCTL_AUTO_ROUTE_UNICAST)))
+		return;
 
 	memset(&req.rtm, 0, sizeof(req.rtm));
 	memset(&rta, 0, sizeof(rta));
--- linux-2.6.15.1/Documentation/networking/ip-sysctl.txt.orig	Fri Feb  3 22:03:37 2006
+++ linux-2.6.15.1/Documentation/networking/ip-sysctl.txt	Fri Feb  3 22:06:25 2006
@@ -27,6 +27,16 @@
 	The advertised MSS depends on the first hop route MTU, but will
 	never be lower than this setting.
 
+ip_autoroute - INTEGER
+	Control the behaviour of setting automatic routes (when adding an
+	ip address). Implemented as a bitmask.
+
+		1 = Add local routes (in local table)
+		2 = Add broadcast routes (in local table)
+		4 = Add unicast route (in main table)
+
+	default 7 - Set all routes
+
 IP Fragmentation:
 
 ipfrag_high_thresh - INTEGER




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