HelenOS sources

VI_VERSION_l      153 uspace/srv/net/inetsrv/pdu.c 	    (4 << VI_VERSION_l) | (hdr_size / sizeof(uint32_t));
VI_VERSION_l      260 uspace/srv/net/inetsrv/pdu.c 	hdr6->ver_tc = (6 << (VI_VERSION_l));
VI_VERSION_l      324 uspace/srv/net/inetsrv/pdu.c 	    VI_VERSION_l, hdr->ver_ihl);
VI_VERSION_l      401 uspace/srv/net/inetsrv/pdu.c 	    VI_VERSION_l, hdr6->ver_tc);
HelenOS homepage, sources at GitHub