nf_conntrack_helpers_register
int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
ret = nf_conntrack_helpers_register(amanda_helper,
ret = nf_conntrack_helpers_register(ftp, ports_c * 2);
ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
EXPORT_SYMBOL_GPL(nf_conntrack_helpers_register);
ret = nf_conntrack_helpers_register(&irc[0], ports_c);
ret = nf_conntrack_helpers_register(sane, ports_c * 2);
ret = nf_conntrack_helpers_register(sip, ports_c * 4);
ret = nf_conntrack_helpers_register(tftp, ports_c * 2);