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struct xt_table_info
{
    unsigned int size;
    unsigned int number;
    unsigned int initial_entries;
    unsigned int hook_entry[NF_IP_NUMHOOKS];
    unsigned int underflow[NF_IP_NUMHOOKS];
    char *entries[NR_CPUS];
};
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struct ipt_entry
{
    struct ipt_ip ip;
    unsigned int nfcache;
    u_int16_t target_offset;
    u_int16_t next_offset;
    unsigned int comefrom;
    struct xt_counters counters;
    unsigned char elems[0];
};
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struct xt_entry_match
{
    union {
        struct {
            u_int16_t match_size;
            char name[XT_FUNCTION_MAXNAMELEN-1];
            u_int8_t revision;
        } user;
        struct {
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