diff -Nur ../busybox-1.7.1.orig/include/usage.h ./include/usage.h
--- ../busybox-1.7.1.orig/include/usage.h	2007-09-03 11:48:46 +0000
+++ ./include/usage.h	2007-10-10 17:12:21 +0000
@@ -1420,7 +1420,7 @@
        "	[up|down] ..."
 
 #define ifup_trivial_usage \
-       "[-ahinv] ifaces..."
+       "[-ahinv"USE_FEATURE_IFUPDOWN_SCRIPTS("Pp")"] ifaces..."
 #define ifup_full_usage \
        "Options:\n" \
        "	-a	De/configure all interfaces automatically\n" \
@@ -1429,10 +1429,13 @@
        "		(note that this option doesn't disable mappings)\n" \
        "	-v	Print out what would happen before doing it\n" \
        "	-m	Don't run any mappings\n" \
-       "	-f	Force de/configuration"
+       "	-f	Force de/configuration" \
+       USE_FEATURE_IFUPDOWN_SCRIPTS( \
+       "\n	-P FILE Script to run before bringing the interface up (default: none)" \
+       "\n	-p FILE Script to run after bringing the interface up (default: none)")
 
 #define ifdown_trivial_usage \
-       "[-ahinv] ifaces..."
+       "[-ahinv"USE_FEATURE_IFUPDOWN_SCRIPTS("Pp")"] ifaces..."
 #define ifdown_full_usage \
        "Options:\n" \
        "	-a	De/configure all interfaces automatically\n" \
@@ -1441,7 +1444,10 @@
        "		(note that this option doesn't disable mappings)\n" \
        "	-v	Print out what would happen before doing it\n" \
        "	-m	Don't run any mappings\n" \
-       "	-f	Force de/configuration"
+       "	-f	Force de/configuration " \
+       USE_FEATURE_IFUPDOWN_SCRIPTS( \
+       "\n	-P FILE Script to run before bringing the interface down (default: none)" \
+       "\n	-p FILE Script to run after bringing the interface down (default: none)")
 
 #define inetd_trivial_usage \
        "[-f] [-q len] [conf]"
diff -Nur ../busybox-1.7.1.orig/networking/Config.in ./networking/Config.in
--- ../busybox-1.7.1.orig/networking/Config.in	2007-09-03 11:48:27 +0000
+++ ./networking/Config.in	2007-10-10 17:00:16 +0000
@@ -323,6 +323,15 @@
 	  This enables support for the "mapping" stanza, unless you have
 	  a weird network setup you don't need it.
 
+config FEATURE_IFUPDOWN_SCRIPTS
+	bool "Enable ifup/ifdown scripts"
+	default n
+	depends on IFUPDOWN
+	select RUN_PARTS
+	help
+		This enables support for scripts which can be called
+		once an interface comes up/down.
+
 config FEATURE_IFUPDOWN_EXTERNAL_DHCP
 	bool "Enable support for external dhcp clients"
 	default n
diff -Nur ../busybox-1.7.1.orig/networking/ifupdown.c ./networking/ifupdown.c
--- ../busybox-1.7.1.orig/networking/ifupdown.c	2007-09-03 11:48:27 +0000
+++ ./networking/ifupdown.c	2007-10-10 16:49:04 +0000
@@ -86,7 +86,7 @@
 	struct mapping_defn_t *mappings;
 };
 
-#define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") "i:"
+#define OPTION_STR "anvf" USE_FEATURE_IFUPDOWN_MAPPING("m") USE_FEATURE_IFUPDOWN_SCRIPTS("P:p:") "i:"
 enum {
 	OPT_do_all = 0x1,
 	OPT_no_act = 0x2,
@@ -950,6 +950,7 @@
 	return 1;
 }
 
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
 static int execute_all(struct interface_defn_t *ifd, const char *opt)
 {
 	int i;
@@ -962,33 +963,58 @@
 		}
 	}
 
-	buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
+	buf = xasprintf("run-parts %s", opt);
 	/* heh, we don't bother free'ing it */
 	return doit(buf);
 }
+#endif
 
 static int check(char *str)
 {
 	return str != NULL;
 }
 
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+static int iface_up(struct interface_defn_t *iface, const char *pre_up_script, const char *up_script)
+#else
 static int iface_up(struct interface_defn_t *iface)
+#endif
 {
 	if (!iface->method->up(iface, check)) return -1;
 	set_environ(iface, "start");
-	if (!execute_all(iface, "pre-up")) return 0;
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	if (pre_up_script) {
+		if (!execute_all(iface, pre_up_script)) return 0;
+	}
+#endif
 	if (!iface->method->up(iface, doit)) return 0;
-	if (!execute_all(iface, "up")) return 0;
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	if (up_script) {
+		if (!execute_all(iface, up_script)) return 0;
+	}
+#endif
 	return 1;
 }
 
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+static int iface_down(struct interface_defn_t *iface, const char *down_script, const char *post_down_script)
+#else
 static int iface_down(struct interface_defn_t *iface)
+#endif
 {
 	if (!iface->method->down(iface,check)) return -1;
 	set_environ(iface, "stop");
-	if (!execute_all(iface, "down")) return 0;
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	if (down_script) {
+		if (!execute_all(iface, down_script)) return 0;
+	}
+#endif
 	if (!iface->method->down(iface, doit)) return 0;
-	if (!execute_all(iface, "post-down")) return 0;
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	if (post_down_script) {
+		if (!execute_all(iface, post_down_script)) return 0;
+	}
+#endif
 	return 1;
 }
 
@@ -1136,10 +1162,18 @@
 int ifupdown_main(int argc, char **argv);
 int ifupdown_main(int argc, char **argv)
 {
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	int (*cmds)(struct interface_defn_t *, const char *, const char *) = NULL;
+#else
 	int (*cmds)(struct interface_defn_t *) = NULL;
+#endif
 	struct interfaces_file_t *defn;
 	llist_t *target_list = NULL;
 	const char *interfaces = "/etc/network/interfaces";
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	const char *pre_script = NULL;
+	const char *post_script = NULL;
+#endif
 	bool any_failures = 0;
 
 	cmds = iface_down;
@@ -1148,7 +1182,11 @@
 		cmds = iface_up;
 	}
 
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+	getopt32(argv, OPTION_STR, &interfaces, &pre_script, &post_script);
+#else
 	getopt32(argv, OPTION_STR, &interfaces);
+#endif
 	if (argc - optind > 0) {
 		if (DO_ALL) bb_show_usage();
 	} else {
@@ -1245,7 +1283,11 @@
 				debug_noise("\nConfiguring interface %s (%s)\n", liface, currif->address_family->name);
 
 				/* Call the cmds function pointer, does either iface_up() or iface_down() */
+#ifdef ENABLE_FEATURE_IFUPDOWN_SCRIPTS
+				cmds_ret = cmds(currif, pre_script, post_script);
+#else
 				cmds_ret = cmds(currif);
+#endif
 				if (cmds_ret == -1) {
 					bb_error_msg("don't seem to have all the variables for %s/%s",
 							liface, currif->address_family->name);