/*
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License; either
 *      version 2 of the License, or any later version, as published by the
 *      Free Software Foundation.
 */

#ifndef _XTABLES_COMPAT_H
#define _XTABLES_COMPAT_H 1

#include <linux/kernel.h>
#include <linux/version.h>
#include "compat_skbuff.h"
#include "compat_xtnu.h"

#define DEBUGP Use__pr_debug__instead

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)
#   warning Kernels below 3.7 not supported.
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0)
#   define prandom_u32() random32()
#endif

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
#   if !defined(CONFIG_NF_CONNTRACK_MARK)
#       warning You have CONFIG_NF_CONNTRACK enabled, but CONFIG_NF_CONNTRACK_MARK is not (please enable).
#   endif
#   include <net/netfilter/nf_conntrack.h>
#else
#   warning You need CONFIG_NF_CONNTRACK.
#endif

#if !defined(NIP6) && !defined(NIP6_FMT)
#   define NIP6(addr) \
        ntohs((addr).s6_addr16[0]), \
        ntohs((addr).s6_addr16[1]), \
        ntohs((addr).s6_addr16[2]), \
        ntohs((addr).s6_addr16[3]), \
        ntohs((addr).s6_addr16[4]), \
        ntohs((addr).s6_addr16[5]), \
        ntohs((addr).s6_addr16[6]), \
        ntohs((addr).s6_addr16[7])
#   define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
#endif
#if !defined(NIPQUAD) && !defined(NIPQUAD_FMT)
#   define NIPQUAD(addr) \
        ((const unsigned char *)&addr)[0], \
        ((const unsigned char *)&addr)[1], \
        ((const unsigned char *)&addr)[2], \
        ((const unsigned char *)&addr)[3]
#   define NIPQUAD_FMT "%u.%u.%u.%u"
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)
static inline struct inode *file_inode(struct file *f)
{
    return f->f_path.dentry->d_inode;
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
static inline void proc_set_user(struct proc_dir_entry *de,
    typeof(de->uid) uid, typeof(de->gid) gid)
{
    de->uid = uid;
    de->gid = gid;
}

static inline void *PDE_DATA(struct inode *inode)
{
    return PDE(inode)->data;
}

static inline void proc_remove(struct proc_dir_entry *de)
{
    if (de != NULL)
        remove_proc_entry(de->name, de->parent);
}
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
#   define ip6_local_out(xnet, xsk, xskb) ip6_local_out(xskb)
#   define ip6_route_me_harder(xnet, xskb) ip6_route_me_harder(xskb)
#   define ip_local_out(xnet, xsk, xskb) ip_local_out(xskb)
#   define ip_route_me_harder(xnet, xskb, xaddrtype) ip_route_me_harder((xskb), (xaddrtype))
#endif

static inline struct net *par_net(const struct xt_action_param *par)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
    return xt_net(par);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)
    return par->net;
#else
    return dev_net((par->in != NULL) ? par->in : par->out);
#endif
}

#endif /* _XTABLES_COMPAT_H */