From e1823fc941f16b4b769e4511c8acb274705cc989 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sun, 7 Apr 2024 15:41:04 +0200
Subject: [PATCH] Run ip link up before adding addresses and routes

On Linux, some iproute2 commands to set addresses and add routes don't work
or have no effect if the link is not up, so make sure we set the link up
first.
---
 src/ifconfig.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/ifconfig.c b/src/ifconfig.c
index d4f13865..9913b815 100644
--- a/src/ifconfig.c
+++ b/src/ifconfig.c
@@ -28,6 +28,9 @@ static long start;
 #ifndef HAVE_WINDOWS
 void ifconfig_header(FILE *out) {
 	fprintf(out, "#!/bin/sh\n");
+#ifdef HAVE_LINUX
+	fprintf(out, "ip link set \"$INTERFACE\" up\n");
+#endif
 	start = ftell(out);
 }
 
@@ -50,12 +53,17 @@ void ifconfig_slaac(FILE *out) {
 
 bool ifconfig_footer(FILE *out) {
 	if(ftell(out) == start) {
-		fprintf(out, "echo 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
-		return false;
-	} else {
+		fprintf(out,
 #ifdef HAVE_LINUX
-		fprintf(out, "ip link set \"$INTERFACE\" up\n");
+		        "#ip addr add <your vpn IP address>/<prefix of whole VPN> dev $INTERFACE\n"
 #else
+		        "#ifconfig $INTERFACE <your vpn IP address>/<prefix of whole VPN>\n"
+#endif
+		        "\n"
+		        "echo \"Unconfigured tinc-up script, please edit '$0'!\" >&2\n");
+		return false;
+	} else {
+#ifndef HAVE_LINUX
 		fprintf(out, "ifconfig \"$INTERFACE\" up\n");
 #endif
 		return true;
-- 
2.20.1