Symbol: PF_CS_PROTO
lib/libpfctl/libpfctl.c
2114
snl_add_msg_attr_u8(&nw, PF_CS_PROTO, kill->proto);
sys/netpfil/pf/pf_nl.c
1080
{ .type = PF_CS_PROTO, .off = _OUT(psk_proto), .cb = nlattr_get_uint8 },