From 262b3b5dc1aaa6f46546f653a7fd8dcb3792fa5a Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Sun, 4 Apr 2021 12:46:28 -0400
Subject: [PATCH] Improve drop count printing

---
 dropcount.sh | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/dropcount.sh b/dropcount.sh
index f67abf7..3cfc4ab 100755
--- a/dropcount.sh
+++ b/dropcount.sh
@@ -10,7 +10,17 @@ bpftool map dump id "$(bpftool map show | grep drop_cnt_map | awk '{ print $1 }'
 		"Found "*) ;;
 		*)
 			if [ "$KEY" != "" ]; then
-				echo "$KEY: $CNT"
+				if [ "$KEY" = "0x00000000" ]; then
+					echo "Invalid packet length: $CNT"
+				elif [ "$KEY" = "0x00000001" ]; then
+					echo "Invalid VLAN tag: $CNT"
+				elif [ "$KEY" = "0x00000002" ]; then
+					echo "Invalid/rejected IHL IPv4 field: $CNT"
+				elif [ "$KEY" = "0x00000003" ]; then
+					echo "Rejected IPv6 fragments: $CNT"
+				else
+					echo "$KEY: $CNT"
+				fi
 			fi
 			KEY=$(echo "$LINE" | awk '{ print "0x" $4 $3 $2 $1 }')
 			CNT=0
-- 
2.39.5