a source node


struct pf_src_node {
       RB_ENTRY(pf_src_node)        entry;
       struct pf_addr               addr;
       struct pf_addr               raddr;
       union pf_rule_ptr            rule;
       struct pfi_kif              *kif;
       u_int64_t                    bytes[2];
       u_int64_t                    packets[2];
       u_int32_t                    states;
       u_int32_t                    conn;
       struct pf_threshold          conn_rate;
       u_int32_t                    creation;
       u_int32_t                    expire;
       sa_family_t                  af;
       u_int8_t                     type;
};