From 70e6f59d896b3b959f8192e55e0e0764b9c281de Mon Sep 17 00:00:00 2001
From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Fri, 15 May 2020 15:33:12 +0200
Subject: [PATCH] Support LOOP link type

---
 pdns/dnspcap.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/pdns/dnspcap.cc b/pdns/dnspcap.cc
index 3924a698d1..aa17af85f1 100644
--- a/pdns/dnspcap.cc
+++ b/pdns/dnspcap.cc
@@ -45,6 +45,9 @@ PcapPacketReader::PcapPacketReader(const string& fname) : d_fname(fname)
   if( d_pfh.linktype==1) {
     d_skipMediaHeader=sizeof(struct ether_header);
   }
+  else if( d_pfh.linktype==12) { // LOOP
+    d_skipMediaHeader=4;
+  }
   else if(d_pfh.linktype==101) {
     d_skipMediaHeader=0;
   }
@@ -114,6 +117,16 @@ try
       d_ether=reinterpret_cast<struct ether_header*>(d_buffer);
       contentCode=ntohs(d_ether->ether_type);
     }
+    else if(d_pfh.linktype == 12) { // LOOP
+      if (d_pheader.caplen < (d_skipMediaHeader + sizeof(*d_ip))) {
+        d_runts++;
+        continue;
+      }
+      if(d_ip->ip_v == 4)
+	contentCode = 0x0800;
+      else
+	contentCode = 0x86dd;
+    }
     else if(d_pfh.linktype==101) {
       if (d_pheader.caplen < (d_skipMediaHeader + sizeof(*d_ip))) {
         d_runts++;
-- 
2.39.2