ip6_tables.h

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/*
 * 25-Jul-1998 Major changes to allow for ip chain table
 *
 * 3-Jan-2000 Named tables to allow packet selection for different uses.
 */

/*
 *  Format of an IP6 firewall descriptor
 *
 *  src, dst, src_mask, dst_mask are always stored in network byte order.
 *  flags are stored in host byte order (of course).
 *  Port numbers are stored in HOST byte order.
 */
#ifndef _IP6_TABLES_H
#define _IP6_TABLES_H

#include <linux/if.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/skbuff.h>

#include <linux/init.h>
#include <uapi/linux/netfilter_ipv6/ip6_tables.h>

extern void ip6t_init(void) __init;

extern void *ip6t_alloc_initial_table(const struct xt_table *);
extern struct xt_table *ip6t_register_table(struct net *net,
                        const struct xt_table *table,
                        const struct ip6t_replace *repl);
extern void ip6t_unregister_table(struct net *net, struct xt_table *table);
extern unsigned int ip6t_do_table(struct sk_buff *skb,
                  unsigned int hook,
                  const struct net_device *in,
                  const struct net_device *out,
                  struct xt_table *table);

/* Check for an extension */
static inline int
ip6t_ext_hdr(u8 nexthdr)
{   return (nexthdr == IPPROTO_HOPOPTS) ||
           (nexthdr == IPPROTO_ROUTING) ||
           (nexthdr == IPPROTO_FRAGMENT) ||
           (nexthdr == IPPROTO_ESP) ||
           (nexthdr == IPPROTO_AH) ||
           (nexthdr == IPPROTO_NONE) ||
           (nexthdr == IPPROTO_DSTOPTS);
}

enum {
    IP6T_FH_F_FRAG  = (1 << 0),
    IP6T_FH_F_AUTH  = (1 << 1),
};

/* find specified header and get offset to it */
extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
             int target, unsigned short *fragoff, int *fragflg);

#ifdef CONFIG_COMPAT
#include <net/compat.h>

struct compat_ip6t_entry {
    struct ip6t_ip6 ipv6;
    compat_uint_t nfcache;
    __u16 target_offset;
    __u16 next_offset;
    compat_uint_t comefrom;
    struct compat_xt_counters counters;
    unsigned char elems[0];
};

static inline struct xt_entry_target *
compat_ip6t_get_target(struct compat_ip6t_entry *e)
{
    return (void *)e + e->target_offset;
}

#endif /* CONFIG_COMPAT */
#endif /* _IP6_TABLES_H */