/usr/share/wireshark/diameter/ is in libwireshark-data 2.0.2+ga16e22e-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/wireshark/diameter/AlcatelLucent.xml
/usr/share/wireshark/diameter/Cisco.xml
/usr/share/wireshark/diameter/Custom.make
/usr/share/wireshark/diameter/Custom.xml
/usr/share/wireshark/diameter/Ericsson.xml
/usr/share/wireshark/diameter/HP.xml
/usr/share/wireshark/diameter/Nokia.xml
/usr/share/wireshark/diameter/NokiaSolutionsAndNetworks.xml
/usr/share/wireshark/diameter/Oracle.xml
/usr/share/wireshark/diameter/Starent.xml
/usr/share/wireshark/diameter/TGPP.xml
/usr/share/wireshark/diameter/TGPP2.xml
/usr/share/wireshark/diameter/Vodafone.xml
/usr/share/wireshark/diameter/chargecontrol.xml
/usr/share/wireshark/diameter/dictionary.dtd
/usr/share/wireshark/diameter/dictionary.xml
/usr/share/wireshark/diameter/eap.xml
/usr/share/wireshark/diameter/etsie2e4.xml
/usr/share/wireshark/diameter/mobileipv4.xml
/usr/share/wireshark/diameter/mobileipv6.xml
/usr/share/wireshark/diameter/nasreq.xml
/usr/share/wireshark/diameter/sip.xml
/usr/share/wireshark/diameter/sunping.xml