/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NF_CONNTRACK_SYNPROXY_H
#define _NF_CONNTRACK_SYNPROXY_H

#include <net/netfilter/nf_conntrack_seqadj.h>
#include <net/netns/generic.h>

struct nf_conn_synproxy {
        u32     isn;
        u32     its;
        u32     tsoff;
};

static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
        return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
#else
        return NULL;
#endif
}

static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
        return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
#else
        return NULL;
#endif
}

static inline bool nf_ct_add_synproxy(struct nf_conn *ct,
                                      const struct nf_conn *tmpl)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
        if (tmpl && nfct_synproxy(tmpl)) {
                if (!nfct_seqadj_ext_add(ct))
                        return false;

                if (!nfct_synproxy_ext_add(ct))
                        return false;
        }
#endif

        return true;
}

#endif /* _NF_CONNTRACK_SYNPROXY_H */