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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _XT_HASHLIMIT_H
#define _XT_HASHLIMIT_H
#include <linux/types.h>
#include <linux/limits.h>
#include <linux/if.h>
/* timings are in milliseconds. */
#define XT_HASHLIMIT_SCALE 10000
#define XT_HASHLIMIT_SCALE_v2 1000000llu
/* 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,
XT_HASHLIMIT_RATE_MATCH = 1 << 6,
};
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 hashlimit_cfg2 {
__u64 avg; /* Average secs between packets * scale */
__u64 burst; /* Period multiplier for upper limit. */
__u32 mode; /* bitmask of XT_HASHLIMIT_HASH_* */
/* 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 hashlimit_cfg3 {
__u64 avg; /* Average secs between packets * scale */
__u64 burst; /* Period multiplier for upper limit. */
__u32 mode; /* bitmask of XT_HASHLIMIT_HASH_* */
/* user specified */
__u32 size; /* how many buckets */
__u32 max; /* max number of entries */
__u32 gc_interval; /* gc interval */
__u32 expire; /* when do entries expire? */
__u32 interval;
__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)));
};
struct xt_hashlimit_mtinfo2 {
char name[NAME_MAX];
struct hashlimit_cfg2 cfg;
/* Used internally by the kernel */
struct xt_hashlimit_htable *hinfo __attribute__((aligned(8)));
};
struct xt_hashlimit_mtinfo3 {
char name[NAME_MAX];
struct hashlimit_cfg3 cfg;
/* Used internally by the kernel */
struct xt_hashlimit_htable *hinfo __attribute__((aligned(8)));
};
#endif /* _XT_HASHLIMIT_H */