From 18bf528393a8f00a82a343c08359acc53b3a447e Mon Sep 17 00:00:00 2001
From: akos011221 <orbanakos2001@gmail.com>
Date: Sun, 8 Mar 2026 21:44:38 +0000
Subject: [PATCH] fix: new ioctl wipes ifr_hwaddr

New ioctl operation ioctl(SIOCGIFADDR) wipes the ifr that contains the MAC address of UPE interface. The MAC was not saved before the wipe causing zero MAC address, making UPE unreachable.
---
 src/tx_afpacket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tx_afpacket.c b/src/tx_afpacket.c
index 1cdad52..6220ee5 100644
--- a/src/tx_afpacket.c
+++ b/src/tx_afpacket.c
@@ -39,6 +39,7 @@ int tx_init(tx_ctx_t *tx, const char *out_iface) {
         close(fd);
         return -1;
     }
+    memcpy(tx->eth_addr, ifr.ifr_hwaddr.sa_data, 6);
 
     /* Get IPv4 address of the interface */
     memset(&ifr, 0, sizeof(ifr));
@@ -53,7 +54,6 @@ int tx_init(tx_ctx_t *tx, const char *out_iface) {
 
     tx->sock_fd = fd;
     tx->ifindex = ifindex;
-    memcpy(tx->eth_addr, ifr.ifr_hwaddr.sa_data, 6);
     return 0;
 }