From f73194fbbbe3cf075ce82c2d5e56274245e042e6 Mon Sep 17 00:00:00 2001
From: Yash Katkar <63966974+yk8329@users.noreply.github.com>
Date: Fri, 29 Mar 2024 21:05:16 +0000
Subject: [PATCH] feat: add the padding if the packet length is odd while
 updating udp checksum

---
 examples/network/sta2eth/main/ethernet_iface.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/network/sta2eth/main/ethernet_iface.c b/examples/network/sta2eth/main/ethernet_iface.c
index 87c99182d3..edc451a0c3 100644
--- a/examples/network/sta2eth/main/ethernet_iface.c
+++ b/examples/network/sta2eth/main/ethernet_iface.c
@@ -118,6 +118,10 @@ static void update_udp_checksum(uint16_t *udp_header, uint16_t* ip_header)
     for (int i = 0; i < payload_len/2; i++) {
         sum += htons(*ptr++);
     }
+    // add the padding if the packet length is odd
+    if (payload_len & 1) {
+        sum += (*((uint8_t *)ptr) << 8);
+    }
     // add some IP header data
     ptr = ip_header + 6;
     for (int i = 0; i < 4; i++) {       // IP addresses