From 3c5293d0ebd29999fe283f740cc19a3b44c0f18a Mon Sep 17 00:00:00 2001
From: HU <kcwxpjpcwloqjzhzyz@sdvrecft.com>
Date: Thu, 23 Oct 2025 00:34:57 +0200
Subject: [PATCH] fixed dissector for packets with inner IPv4/IPv6 packets

---
 wireshark/scat.lua | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/wireshark/scat.lua b/wireshark/scat.lua
index 86a7d30..2227e0b 100644
--- a/wireshark/scat.lua
+++ b/wireshark/scat.lua
@@ -330,6 +330,20 @@ function gsmtapv3_parse_metadata(t, hdr_buffer, hdr_len)
 end
 
 function gsmtap_wrapper_proto.dissector(tvbuffer, pinfo, treeitem)
+    -- Detect inner IP packets and forward them to the IP dissector
+    if tvbuffer:len() > 1 then
+        local first = tvbuffer(0,1):uint()
+        local ipver = bit.rshift(first, 4)
+        if ipver == 4 then
+            pinfo.cols.protocol = "IPv4"
+            Dissector.get("ip"):call(tvbuffer, pinfo, treeitem)
+            return
+        elseif ipver == 6 then
+            pinfo.cols.protocol = "IPv6"
+            Dissector.get("ipv6"):call(tvbuffer, pinfo, treeitem)
+            return
+        end
+    end
     -- GSMTAPv3
     local version = tvbuffer(0, 1):uint()
     if version == 3 then