xt_hashlimit.h

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#ifndef _UAPI_XT_HASHLIMIT_H
#define _UAPI_XT_HASHLIMIT_H

#include <linux/types.h>

/* timings are in milliseconds. */
#define XT_HASHLIMIT_SCALE 10000
/* 1/10,000 sec period => max of 10,000/sec.  Min rate is then 429490
 * seconds, or one packet every 59 hours.
 */

/* packet length accounting is done in 16-byte steps */
#define XT_HASHLIMIT_BYTE_SHIFT 4

/* details of this structure hidden by the implementation */
struct xt_hashlimit_htable;

enum {
    XT_HASHLIMIT_HASH_DIP = 1 << 0,
    XT_HASHLIMIT_HASH_DPT = 1 << 1,
    XT_HASHLIMIT_HASH_SIP = 1 << 2,
    XT_HASHLIMIT_HASH_SPT = 1 << 3,
    XT_HASHLIMIT_INVERT   = 1 << 4,
    XT_HASHLIMIT_BYTES    = 1 << 5,
};

struct hashlimit_cfg {
    __u32 mode;   /* bitmask of XT_HASHLIMIT_HASH_* */
    __u32 avg;    /* Average secs between packets * scale */
    __u32 burst;  /* Period multiplier for upper limit. */

    /* user specified */
    __u32 size;     /* how many buckets */
    __u32 max;      /* max number of entries */
    __u32 gc_interval;  /* gc interval */
    __u32 expire;   /* when do entries expire? */
};

struct xt_hashlimit_info {
    char name [IFNAMSIZ];       /* name */
    struct hashlimit_cfg cfg;

    /* Used internally by the kernel */
    struct xt_hashlimit_htable *hinfo;
    union {
        void *ptr;
        struct xt_hashlimit_info *master;
    } u;
};

struct hashlimit_cfg1 {
    __u32 mode;   /* bitmask of XT_HASHLIMIT_HASH_* */
    __u32 avg;    /* Average secs between packets * scale */
    __u32 burst;  /* Period multiplier for upper limit. */

    /* user specified */
    __u32 size;     /* how many buckets */
    __u32 max;      /* max number of entries */
    __u32 gc_interval;  /* gc interval */
    __u32 expire;   /* when do entries expire? */

    __u8 srcmask, dstmask;
};

struct xt_hashlimit_mtinfo1 {
    char name[IFNAMSIZ];
    struct hashlimit_cfg1 cfg;

    /* Used internally by the kernel */
    struct xt_hashlimit_htable *hinfo __attribute__((aligned(8)));
};

#endif /* _UAPI_XT_HASHLIMIT_H */