/* ip6tables match extension for limiting packets per destination
*
* (C) 2003-2004 by Harald Welte <laforge@netfilter.org>
*
* Development of this code was funded by Astaro AG, http://www.astaro.com/
*
* Based on ipt_limit.c by
* Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
* Hervé Eychenne <rv@wallfire.org>
*
* Error corections by nmalykh@bilim.com (22.01.2005)
*/
#define _BSD_SOURCE 1
#define _DEFAULT_SOURCE 1
#define _ISOC99_SOURCE 1
#include <inttypes.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_hashlimit.h>
#define XT_HASHLIMIT_BURST 5
#define XT_HASHLIMIT_BURST_MAX_v1 10000
#define XT_HASHLIMIT_BURST_MAX 1000000
#define XT_HASHLIMIT_BYTE_EXPIRE 15
#define XT_HASHLIMIT_BYTE_EXPIRE_BURST 60
/* miliseconds */
#define XT_HASHLIMIT_GCINTERVAL 1000
struct hashlimit_mt_udata {
uint32_t mult;
};
static void hashlimit_help(void)
{
printf(
"hashlimit match options:\n"
"--hashlimit <avg> max average match rate\n"
" [Packets per second unless followed by \n"
" /sec /minute /hour /day postfixes]\n"
"--hashlimit-mode <mode> mode is a comma-separated list of\n"
" dstip,srcip,dstport,srcport\n"
"--hashlimit-name <name> name for /proc/net/ipt_hashlimit/\n"
"[--hashlimit-burst <num>] number to match in a burst, default %u\n"
"[--hashlimit-htable-size <num>] number of hashtable buckets\n"
"[--hashlimit-htable-max <num>] number of hashtable entries\n"
"[--hashlimit-htable-gcinterval] interval between garbage collection runs\n"
"[--hashlimit-htable-expire] after which time are idle entries expired?\n",
XT_HASHLIMIT_BURST);
}
enum {
O_UPTO = 0,
O_ABOVE,
O_LIMIT,
O_MODE,
O_SRCMASK,
O_DSTMASK,
O_NAME,
O_BURST,
O_HTABLE_SIZE,
O_HTABLE_MAX,
O_HTABLE_GCINT,
O_HTABLE_EXPIRE,
O_RATEMATCH,
O_INTERVAL,
F_BURST = 1 << O_BURST,
F_UPTO = 1 << O_UPTO,
F_ABOVE = 1 << O_ABOVE,
F_HTABLE_EXPIRE = 1 << O_HTABLE_EXPIRE,
F_RATEMATCH = 1 << O_RATEMATCH,
};
static void hashlimit_mt_help(void)
{
printf(
"hashlimit match options:\n"
" --hashlimit-upto <avg> max average match rate\n"
" [Packets per second unless followed by \n"
" /sec /minute /hour /day postfixes]\n"
" --hashlimit-above <avg> min average match rate\n"
" --hashlimit-mode <mode> mode is a comma-separated list of\n"
" dstip,srcip,dstport,srcport (or none)\n"
" --hashlimit-srcmask <length> source address grouping prefix length\n"
" --hashlimit-dstmask <length> destination address grouping prefix length\n"
" --hashlimit-name <name> name for /proc/net/ipt_hashlimit\n"
" --hashlimit-burst <num> number to match in a burst, default %u\n"
" --hashlimit-htable-size <num> number of hashtable buckets\n"
" --hashlimit-htable-max <num> number of hashtable entries\n"
" --hashlimit-htable-gcinterval interval between garbage collection runs\n"
" --hashlimit-htable-expire after which time are idle entries expired?\n"
"\n", XT_HASHLIMIT_BURST);
}
static void hashlimit_mt_help_v3(void)
{
printf(
"hashlimit match options:\n"
" --hashlimit-upto <avg> max average match rate\n"
" [Packets per second unless followed by \n"
" /sec /minute /hour /day postfixes]\n"
" --hashlimit-above <avg> min average match rate\n"
" --hashlimit-mode <mode> mode is a comma-separated list of\n"
" dstip,srcip,dstport,srcport (or none)\n"
" --hashlimit-srcmask <length> source address grouping prefix length\n"
" --hashlimit-dstmask <length> destination address grouping prefix length\n"
" --hashlimit-name <name> name for /proc/net/ipt_hashlimit\n"
" --hashlimit-burst <num> number to match in a burst, default %u\n"
" --hashlimit-htable-size <num> number of hashtable buckets\n"
" --hashlimit-htable-max <num> number of hashtable entries\n"
" --hashlimit-htable-gcinterval interval between garbage collection runs\n"
" --hashlimit-htable-expire after which time are idle entries expired?\n"
" --hashlimit-rate-match rate match the flow without rate-limiting it\n"
" --hashlimit-rate-interval interval in seconds for hashlimit-rate-match\n"
"\n", XT_HASHLIMIT_BURST);
}
#define s struct xt_hashlimit_info
static const struct xt_option_entry hashlimit_opts[] = {
{.name = "hashlimit", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING},
{.name = "hashlimit-burst", .id = O_BURST, .type = XTTYPE_UINT32,
.min = 1, .max = XT_HASHLIMIT_BURST_MAX_v1, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.burst)},
{.name = "hashlimit-htable-size", .id = O_HTABLE_SIZE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.size)},
{.name = "hashlimit-htable-max", .id = O_HTABLE_MAX,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.max)},
{.name = "hashlimit-htable-gcinterval", .id = O_HTABLE_GCINT,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.gc_interval)},
{.name = "hashlimit-htable-expire", .id = O_HTABLE_EXPIRE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.expire)},
{.name = "hashlimit-mode", .id = O_MODE, .type = XTTYPE_STRING,
.flags = XTOPT_MAND},
{.name = "hashlimit-name", .id = O_NAME, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, name), .min = 1},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_hashlimit_mtinfo1
static const struct xt_option_entry hashlimit_mt_opts_v1[] = {
{.name = "hashlimit-upto", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit-above", .id = O_ABOVE, .excl = F_UPTO,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT}, /* old name */
{.name = "hashlimit-srcmask", .id = O_SRCMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-dstmask", .id = O_DSTMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-burst", .id = O_BURST, .type = XTTYPE_STRING},
{.name = "hashlimit-htable-size", .id = O_HTABLE_SIZE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.size)},
{.name = "hashlimit-htable-max", .id = O_HTABLE_MAX,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.max)},
{.name = "hashlimit-htable-gcinterval", .id = O_HTABLE_GCINT,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.gc_interval)},
{.name = "hashlimit-htable-expire", .id = O_HTABLE_EXPIRE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.expire)},
{.name = "hashlimit-mode", .id = O_MODE, .type = XTTYPE_STRING},
{.name = "hashlimit-name", .id = O_NAME, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, name), .min = 1},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_hashlimit_mtinfo2
static const struct xt_option_entry hashlimit_mt_opts_v2[] = {
{.name = "hashlimit-upto", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit-above", .id = O_ABOVE, .excl = F_UPTO,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT}, /* old name */
{.name = "hashlimit-srcmask", .id = O_SRCMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-dstmask", .id = O_DSTMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-burst", .id = O_BURST, .type = XTTYPE_STRING},
{.name = "hashlimit-htable-size", .id = O_HTABLE_SIZE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.size)},
{.name = "hashlimit-htable-max", .id = O_HTABLE_MAX,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.max)},
{.name = "hashlimit-htable-gcinterval", .id = O_HTABLE_GCINT,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.gc_interval)},
{.name = "hashlimit-htable-expire", .id = O_HTABLE_EXPIRE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.expire)},
{.name = "hashlimit-mode", .id = O_MODE, .type = XTTYPE_STRING},
{.name = "hashlimit-name", .id = O_NAME, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, name), .min = 1},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_hashlimit_mtinfo3
static const struct xt_option_entry hashlimit_mt_opts[] = {
{.name = "hashlimit-upto", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit-above", .id = O_ABOVE, .excl = F_UPTO,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
{.name = "hashlimit", .id = O_UPTO, .excl = F_ABOVE,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT}, /* old name */
{.name = "hashlimit-srcmask", .id = O_SRCMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-dstmask", .id = O_DSTMASK, .type = XTTYPE_PLEN},
{.name = "hashlimit-burst", .id = O_BURST, .type = XTTYPE_STRING},
{.name = "hashlimit-htable-size", .id = O_HTABLE_SIZE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.size)},
{.name = "hashlimit-htable-max", .id = O_HTABLE_MAX,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.max)},
{.name = "hashlimit-htable-gcinterval", .id = O_HTABLE_GCINT,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.gc_interval)},
{.name = "hashlimit-htable-expire", .id = O_HTABLE_EXPIRE,
.type = XTTYPE_UINT32, .flags = XTOPT_PUT,
XTOPT_POINTER(s, cfg.expire)},
{.name = "hashlimit-mode", .id = O_MODE, .type = XTTYPE_STRING},
{.name = "hashlimit-name", .id = O_NAME, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, name), .min = 1},
{.name = "hashlimit-rate-match", .id = O_RATEMATCH, .type = XTTYPE_NONE},
{.name = "hashlimit-rate-interval", .id = O_INTERVAL, .type = XTTYPE_STRING},
XTOPT_TABLEEND,
};
#undef s
static int
cfg_copy(struct hashlimit_cfg3 *to, const void *from, int revision)
{
if (revision == 1) {
struct hashlimit_cfg1 *cfg = (struct hashlimit_cfg1 *)from;
to->mode = cfg->mode;
to->avg = cfg->avg;
to->burst = cfg->burst;
to->size = cfg->size;
to->max = cfg->max;
to->gc_interval = cfg->gc_interval;
to->expire = cfg->expire;
to->srcmask = cfg->srcmask;
to->dstmask = cfg->dstmask;
} else if (revision == 2) {
struct hashlimit_cfg2 *cfg = (struct hashlimit_cfg2 *)from;
to->mode = cfg->mode;
to->avg = cfg->avg;
to->burst = cfg->burst;
to->size = cfg->size;
to->max = cfg->max;
to->gc_interval = cfg->gc_interval;
to->expire = cfg->expire;
to->srcmask = cfg->srcmask;
to->dstmask = cfg->dstmask;
} else if (revision == 3) {
memcpy(to, from, sizeof(struct hashlimit_cfg3));
} else {
return -EINVAL;
}
return 0;
}
static uint64_t cost_to_bytes(uint64_t cost)
{
uint64_t r;
r = cost ? UINT32_MAX / cost : UINT32_MAX;
r = (r - 1) << XT_HASHLIMIT_BYTE_SHIFT;
return r;
}
static uint64_t bytes_to_cost(uint64_t bytes)
{
uint32_t r = bytes >> XT_HASHLIMIT_BYTE_SHIFT;
return UINT32_MAX / (r+1);
}
static uint32_t get_factor(int chr)
{
switch (chr) {
case 'm': return 1024 * 1024;
case 'k': return 1024;
}
return 1;
}
static void burst_error_v1(void)
{
xtables_error(PARAMETER_PROBLEM, "bad value for option "
"\"--hashlimit-burst\", or out of range (1-%u).", XT_HASHLIMIT_BURST_MAX_v1);
}
static void burst_error(void)
{
xtables_error(PARAMETER_PROBLEM, "bad value for option "
"\"--hashlimit-burst\", or out of range (1-%u).", XT_HASHLIMIT_BURST_MAX);
}
static uint64_t parse_burst(const char *burst, int revision)
{
uintmax_t v;
char *end;
uint64_t max = (revision == 1) ? UINT32_MAX : UINT64_MAX;
uint64_t burst_max = (revision == 1) ?
XT_HASHLIMIT_BURST_MAX_v1 : XT_HASHLIMIT_BURST_MAX;
if (!xtables_strtoul(burst, &end, &v, 1, max) ||
(*end == 0 && v > burst_max)) {
if (revision == 1)
burst_error_v1();
else
burst_error();
}
v *= get_factor(*end);
if (v > max)
xtables_error(PARAMETER_PROBLEM, "bad value for option "
"\"--hashlimit-burst\", value \"%s\" too large "
"(max %"PRIu64"mb).", burst, max/1024/1024);
return v;
}
static bool parse_bytes(const char *rate, void *val, struct hashlimit_mt_udata *ud, int revision)
{
unsigned int factor = 1;
uint64_t tmp, r;
const char *mode = strstr(rate, "b/s");
uint64_t max = (revision == 1) ? UINT32_MAX : UINT64_MAX;
if (!mode || mode == rate)
return false;
mode--;
r = atoll(rate);
if (r == 0)
return false;
factor = get_factor(*mode);
tmp = (uint64_t) r * factor;
if (tmp > max)
xtables_error(PARAMETER_PROBLEM,
"Rate value too large \"%"PRIu64"\" (max %"PRIu64")\n",
tmp, max);
tmp = bytes_to_cost(tmp);
if (tmp == 0)
xtables_error(PARAMETER_PROBLEM, "Rate too high \"%s\"\n", rate);
ud->mult = XT_HASHLIMIT_BYTE_EXPIRE;
if(revision == 1)
*((uint32_t*)val) = tmp;
else
*((uint64_t*)val) = tmp;
return true;
}
static
int parse_rate(const char *rate, void *val, struct hashlimit_mt_udata *ud, int revision)
{
const char *delim;
uint64_t tmp, r;
uint64_t scale = (revision == 1) ? XT_HASHLIMIT_SCALE : XT_HASHLIMIT_SCALE_v2;
ud->mult = 1; /* Seconds by default. */
delim = strchr(rate, '/');
if (delim) {
if (strlen(delim+1) == 0)
return 0;
if (strncasecmp(delim+1, "second", strlen(delim+1)) == 0)
ud->mult = 1;
else if (strncasecmp(delim+1, "minute", strlen(delim+1)) == 0)
ud->mult = 60;
else if (strncasecmp(delim+1, "hour", strlen(delim+1)) == 0)
ud->mult = 60*60;
else if (strncasecmp(delim+1, "day", strlen(delim+1)) == 0)
ud->mult = 24*60*60;
else
return 0;
}
r = atoll(rate);
if (!r)
return 0;
tmp = scale * ud->mult / r;
if (tmp == 0)
/*
* The rate maps to infinity. (1/day is the minimum they can
* specify, so we are ok at that end).
*/
xtables_error(PARAMETER_PROBLEM, "Rate too fast \"%s\"\n", rate);
if(revision == 1)
*((uint32_t*)val) = tmp;
else
*((uint64_t*)val) = tmp;
return 1;
}
static int parse_interval(const char *rate, uint32_t *val)
{
int r = atoi(rate);
if (r <= 0)
return 0;
*val = r;
return 1;
}
static void hashlimit_init(struct xt_entry_match *m)
{
struct xt_hashlimit_info *r = (struct xt_hashlimit_info *)m->data;
r->cfg.burst = XT_HASHLIMIT_BURST;
r->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
}
static void hashlimit_mt4_init_v1(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo1 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 32;
info->cfg.dstmask = 32;
}
static void hashlimit_mt6_init_v1(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo1 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 128;
info->cfg.dstmask = 128;
}
static void hashlimit_mt4_init_v2(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo2 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 32;
info->cfg.dstmask = 32;
}
static void hashlimit_mt6_init_v2(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo2 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 128;
info->cfg.dstmask = 128;
}
static void hashlimit_mt4_init(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo3 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 32;
info->cfg.dstmask = 32;
info->cfg.interval = 0;
}
static void hashlimit_mt6_init(struct xt_entry_match *match)
{
struct xt_hashlimit_mtinfo3 *info = (void *)match->data;
info->cfg.mode = 0;
info->cfg.burst = XT_HASHLIMIT_BURST;
info->cfg.gc_interval = XT_HASHLIMIT_GCINTERVAL;
info->cfg.srcmask = 128;
info->cfg.dstmask = 128;
info->cfg.interval = 0;
}
/* Parse a 'mode' parameter into the required bitmask */
static int parse_mode(uint32_t *mode, const char *option_arg)
{
char *tok;
char *arg = strdup(option_arg);
if (!arg)
return -1;
for (tok = strtok(arg, ",|");
tok;
tok = strtok(NULL, ",|")) {
if (!strcmp(tok, "dstip"))
*mode |= XT_HASHLIMIT_HASH_DIP;
else if (!strcmp(tok, "srcip"))
*mode |= XT_HASHLIMIT_HASH_SIP;
else if (!strcmp(tok, "srcport"))
*mode |= XT_HASHLIMIT_HASH_SPT;
else if (!strcmp(tok, "dstport"))
*mode |= XT_HASHLIMIT_HASH_DPT;
else {
free(arg);
return -1;
}
}
free(arg);
return 0;
}
static void hashlimit_parse(struct xt_option_call *cb)
{
struct xt_hashlimit_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_UPTO:
if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 1))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-upto", cb->arg);
break;
case O_MODE:
if (parse_mode(&info->cfg.mode, cb->arg) < 0)
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-mode", cb->arg);
break;
}
}
static void hashlimit_mt_parse_v1(struct xt_option_call *cb)
{
struct xt_hashlimit_mtinfo1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_BURST:
info->cfg.burst = parse_burst(cb->arg, 1);
break;
case O_UPTO:
if (cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 1))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 1))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-upto", cb->arg);
break;
case O_ABOVE:
if (!cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 1))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 1))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-above", cb->arg);
break;
case O_MODE:
if (parse_mode(&info->cfg.mode, cb->arg) < 0)
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-mode", cb->arg);
break;
case O_SRCMASK:
info->cfg.srcmask = cb->val.hlen;
break;
case O_DSTMASK:
info->cfg.dstmask = cb->val.hlen;
break;
}
}
static void hashlimit_mt_parse_v2(struct xt_option_call *cb)
{
struct xt_hashlimit_mtinfo2 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_BURST:
info->cfg.burst = parse_burst(cb->arg, 2);
break;
case O_UPTO:
if (cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 2))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 2))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-upto", cb->arg);
break;
case O_ABOVE:
if (!cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 2))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 2))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-above", cb->arg);
break;
case O_MODE:
if (parse_mode(&info->cfg.mode, cb->arg) < 0)
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-mode", cb->arg);
break;
case O_SRCMASK:
info->cfg.srcmask = cb->val.hlen;
break;
case O_DSTMASK:
info->cfg.dstmask = cb->val.hlen;
break;
}
}
static void hashlimit_mt_parse(struct xt_option_call *cb)
{
struct xt_hashlimit_mtinfo3 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_BURST:
info->cfg.burst = parse_burst(cb->arg, 2);
break;
case O_UPTO:
if (cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 2))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 2))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-upto", cb->arg);
break;
case O_ABOVE:
if (!cb->invert)
info->cfg.mode |= XT_HASHLIMIT_INVERT;
if (parse_bytes(cb->arg, &info->cfg.avg, cb->udata, 2))
info->cfg.mode |= XT_HASHLIMIT_BYTES;
else if (!parse_rate(cb->arg, &info->cfg.avg, cb->udata, 2))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-above", cb->arg);
break;
case O_MODE:
if (parse_mode(&info->cfg.mode, cb->arg) < 0)
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-mode", cb->arg);
break;
case O_SRCMASK:
info->cfg.srcmask = cb->val.hlen;
break;
case O_DSTMASK:
info->cfg.dstmask = cb->val.hlen;
break;
case O_RATEMATCH:
info->cfg.mode |= XT_HASHLIMIT_RATE_MATCH;
break;
case O_INTERVAL:
if (!parse_interval(cb->arg, &info->cfg.interval))
xtables_param_act(XTF_BAD_VALUE, "hashlimit",
"--hashlimit-rate-interval", cb->arg);
}
}
static void hashlimit_check(struct xt_fcheck_call *cb)
{
const struct hashlimit_mt_udata *udata = cb->udata;
struct xt_hashlimit_info *info = cb->data;
if (!(cb->xflags & (F_UPTO | F_ABOVE)))
xtables_error(PARAMETER_PROBLEM,
"You have to specify --hashlimit");
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = udata->mult * 1000; /* from s to msec */
}
static void hashlimit_mt_check_v1(struct xt_fcheck_call *cb)
{
const struct hashlimit_mt_udata *udata = cb->udata;
struct xt_hashlimit_mtinfo1 *info = cb->data;
if (!(cb->xflags & (F_UPTO | F_ABOVE)))
xtables_error(PARAMETER_PROBLEM,
"You have to specify --hashlimit");
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = udata->mult * 1000; /* from s to msec */
if (info->cfg.mode & XT_HASHLIMIT_BYTES) {
uint32_t burst = 0;
if (cb->xflags & F_BURST) {
if (info->cfg.burst < cost_to_bytes(info->cfg.avg))
xtables_error(PARAMETER_PROBLEM,
"burst cannot be smaller than %"PRIu64"b",
cost_to_bytes(info->cfg.avg));
burst = info->cfg.burst;
burst /= cost_to_bytes(info->cfg.avg);
if (info->cfg.burst % cost_to_bytes(info->cfg.avg))
burst++;
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = XT_HASHLIMIT_BYTE_EXPIRE_BURST * 1000;
}
info->cfg.burst = burst;
} else if (info->cfg.burst > XT_HASHLIMIT_BURST_MAX_v1)
burst_error_v1();
}
static void hashlimit_mt_check_v2(struct xt_fcheck_call *cb)
{
const struct hashlimit_mt_udata *udata = cb->udata;
struct xt_hashlimit_mtinfo2 *info = cb->data;
if (!(cb->xflags & (F_UPTO | F_ABOVE)))
xtables_error(PARAMETER_PROBLEM,
"You have to specify --hashlimit");
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = udata->mult * 1000; /* from s to msec */
if (info->cfg.mode & XT_HASHLIMIT_BYTES) {
uint32_t burst = 0;
if (cb->xflags & F_BURST) {
if (info->cfg.burst < cost_to_bytes(info->cfg.avg))
xtables_error(PARAMETER_PROBLEM,
"burst cannot be smaller than %"PRIu64"b",
cost_to_bytes(info->cfg.avg));
burst = info->cfg.burst;
burst /= cost_to_bytes(info->cfg.avg);
if (info->cfg.burst % cost_to_bytes(info->cfg.avg))
burst++;
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = XT_HASHLIMIT_BYTE_EXPIRE_BURST * 1000;
}
info->cfg.burst = burst;
} else if (info->cfg.burst > XT_HASHLIMIT_BURST_MAX)
burst_error();
}
static void hashlimit_mt_check(struct xt_fcheck_call *cb)
{
const struct hashlimit_mt_udata *udata = cb->udata;
struct xt_hashlimit_mtinfo3 *info = cb->data;
if (!(cb->xflags & (F_UPTO | F_ABOVE)))
xtables_error(PARAMETER_PROBLEM,
"You have to specify --hashlimit");
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = udata->mult * 1000; /* from s to msec */
if (info->cfg.mode & XT_HASHLIMIT_BYTES) {
uint32_t burst = 0;
if (cb->xflags & F_BURST) {
if (info->cfg.burst < cost_to_bytes(info->cfg.avg))
xtables_error(PARAMETER_PROBLEM,
"burst cannot be smaller than %"PRIu64"b", cost_to_bytes(info->cfg.avg));
burst = info->cfg.burst;
burst /= cost_to_bytes(info->cfg.avg);
if (info->cfg.burst % cost_to_bytes(info->cfg.avg))
burst++;
if (!(cb->xflags & F_HTABLE_EXPIRE))
info->cfg.expire = XT_HASHLIMIT_BYTE_EXPIRE_BURST * 1000;
}
info->cfg.burst = burst;
} else if (info->cfg.burst > XT_HASHLIMIT_BURST_MAX)
burst_error();
if (cb->xflags & F_RATEMATCH) {
if (!(info->cfg.mode & XT_HASHLIMIT_BYTES))
info->cfg.avg /= udata->mult;
if (info->cfg.interval == 0) {
if (info->cfg.mode & XT_HASHLIMIT_BYTES)
info->cfg.interval = 1;
else
info->cfg.interval = udata->mult;
}
}
}
struct rates {
const char *name;
uint64_t mult;
} rates_v1[] = { { "day", XT_HASHLIMIT_SCALE*24*60*60 },
{ "hour", XT_HASHLIMIT_SCALE*60*60 },
{ "min", XT_HASHLIMIT_SCALE*60 },
{ "sec", XT_HASHLIMIT_SCALE } };
static const struct rates rates[] = {
{ "day", XT_HASHLIMIT_SCALE_v2*24*60*60 },
{ "hour", XT_HASHLIMIT_SCALE_v2*60*60 },
{ "min", XT_HASHLIMIT_SCALE_v2*60 },
{ "sec", XT_HASHLIMIT_SCALE_v2 } };
static uint32_t print_rate(uint64_t period, int revision)
{
unsigned int i;
const struct rates *_rates = (revision == 1) ? rates_v1 : rates;
uint64_t scale = (revision == 1) ? XT_HASHLIMIT_SCALE : XT_HASHLIMIT_SCALE_v2;
if (period == 0) {
printf(" %f", INFINITY);
return 0;
}
for (i = 1; i < ARRAY_SIZE(rates); ++i)
if (period > _rates[i].mult
|| _rates[i].mult/period < _rates[i].mult%period)
break;
printf(" %"PRIu64"/%s", _rates[i-1].mult / period, _rates[i-1].name);
/* return in msec */
return _rates[i-1].mult / scale * 1000;
}
static const struct {
const char *name;
uint32_t thresh;
} units[] = {
{ "m", 1024 * 1024 },
{ "k", 1024 },
{ "", 1 },
};
static uint32_t print_bytes(uint64_t avg, uint64_t burst, const char *prefix)
{
unsigned int i;
unsigned long long r;
r = cost_to_bytes(avg);
for (i = 0; i < ARRAY_SIZE(units) -1; ++i)
if (r >= units[i].thresh &&
bytes_to_cost(r & ~(units[i].thresh - 1)) == avg)
break;
printf(" %llu%sb/s", r/units[i].thresh, units[i].name);
if (burst == 0)
return XT_HASHLIMIT_BYTE_EXPIRE * 1000;
r *= burst;
printf(" %s", prefix);
for (i = 0; i < ARRAY_SIZE(units) -1; ++i)
if (r >= units[i].thresh)
break;
printf("burst %llu%sb", r / units[i].thresh, units[i].name);
return XT_HASHLIMIT_BYTE_EXPIRE_BURST * 1000;
}
static void print_mode(unsigned int mode, char separator)
{
bool prevmode = false;
putchar(' ');
if (mode & XT_HASHLIMIT_HASH_SIP) {
fputs("srcip", stdout);
prevmode = 1;
}
if (mode & XT_HASHLIMIT_HASH_SPT) {
if (prevmode)
putchar(separator);
fputs("srcport", stdout);
prevmode = 1;
}
if (mode & XT_HASHLIMIT_HASH_DIP) {
if (prevmode)
putchar(separator);
fputs("dstip", stdout);
prevmode = 1;
}
if (mode & XT_HASHLIMIT_HASH_DPT) {
if (prevmode)
putchar(separator);
fputs("dstport", stdout);
}
}
static void hashlimit_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
const struct xt_hashlimit_info *r = (const void *)match->data;
uint32_t quantum;
fputs(" limit: avg", stdout);
quantum = print_rate(r->cfg.avg, 1);
printf(" burst %u", r->cfg.burst);
fputs(" mode", stdout);
print_mode(r->cfg.mode, '-');
if (r->cfg.size)
printf(" htable-size %u", r->cfg.size);
if (r->cfg.max)
printf(" htable-max %u", r->cfg.max);
if (r->cfg.gc_interval != XT_HASHLIMIT_GCINTERVAL)
printf(" htable-gcinterval %u", r->cfg.gc_interval);
if (r->cfg.expire != quantum)
printf(" htable-expire %u", r->cfg.expire);
}
static void
hashlimit_mt_print(const struct hashlimit_cfg3 *cfg, unsigned int dmask, int revision)
{
uint64_t quantum;
uint64_t period;
if (cfg->mode & XT_HASHLIMIT_INVERT)
fputs(" limit: above", stdout);
else
fputs(" limit: up to", stdout);
if (cfg->mode & XT_HASHLIMIT_BYTES) {
quantum = print_bytes(cfg->avg, cfg->burst, "");
} else {
if (revision == 3) {
period = cfg->avg;
if (cfg->interval != 0)
period *= cfg->interval;
quantum = print_rate(period, revision);
} else {
quantum = print_rate(cfg->avg, revision);
}
printf(" burst %llu", cfg->burst);
}
if (cfg->mode & (XT_HASHLIMIT_HASH_SIP | XT_HASHLIMIT_HASH_SPT |
XT_HASHLIMIT_HASH_DIP | XT_HASHLIMIT_HASH_DPT)) {
fputs(" mode", stdout);
print_mode(cfg->mode, '-');
}
if (cfg->size != 0)
printf(" htable-size %u", cfg->size);
if (cfg->max != 0)
printf(" htable-max %u", cfg->max);
if (cfg->gc_interval != XT_HASHLIMIT_GCINTERVAL)
printf(" htable-gcinterval %u", cfg->gc_interval);
if (cfg->expire != quantum)
printf(" htable-expire %u", cfg->expire);
if (cfg->srcmask != dmask)
printf(" srcmask %u", cfg->srcmask);
if (cfg->dstmask != dmask)
printf(" dstmask %u", cfg->dstmask);
if ((revision == 3) && (cfg->mode & XT_HASHLIMIT_RATE_MATCH))
printf(" rate-match");
if ((revision == 3) && (cfg->mode & XT_HASHLIMIT_RATE_MATCH))
if (cfg->interval != 1)
printf(" rate-interval %u", cfg->interval);
}
static void
hashlimit_mt4_print_v1(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo1 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 1);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_print(&cfg, 32, 1);
}
static void
hashlimit_mt6_print_v1(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo1 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 1);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_print(&cfg, 128, 1);
}
static void
hashlimit_mt4_print_v2(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo2 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 2);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_print(&cfg, 32, 2);
}
static void
hashlimit_mt6_print_v2(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo2 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 2);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_print(&cfg, 128, 2);
}
static void
hashlimit_mt4_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo3 *info = (const void *)match->data;
hashlimit_mt_print(&info->cfg, 32, 3);
}
static void
hashlimit_mt6_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_hashlimit_mtinfo3 *info = (const void *)match->data;
hashlimit_mt_print(&info->cfg, 128, 3);
}
static void hashlimit_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_info *r = (const void *)match->data;
uint32_t quantum;
fputs(" --hashlimit", stdout);
quantum = print_rate(r->cfg.avg, 1);
printf(" --hashlimit-burst %u", r->cfg.burst);
fputs(" --hashlimit-mode", stdout);
print_mode(r->cfg.mode, ',');
printf(" --hashlimit-name %s", r->name);
if (r->cfg.size)
printf(" --hashlimit-htable-size %u", r->cfg.size);
if (r->cfg.max)
printf(" --hashlimit-htable-max %u", r->cfg.max);
if (r->cfg.gc_interval != XT_HASHLIMIT_GCINTERVAL)
printf(" --hashlimit-htable-gcinterval %u", r->cfg.gc_interval);
if (r->cfg.expire != quantum)
printf(" --hashlimit-htable-expire %u", r->cfg.expire);
}
static void
hashlimit_mt_save(const struct hashlimit_cfg3 *cfg, const char* name, unsigned int dmask, int revision)
{
uint32_t quantum;
if (cfg->mode & XT_HASHLIMIT_INVERT)
fputs(" --hashlimit-above", stdout);
else
fputs(" --hashlimit-upto", stdout);
if (cfg->mode & XT_HASHLIMIT_BYTES) {
quantum = print_bytes(cfg->avg, cfg->burst, "--hashlimit-");
} else {
quantum = print_rate(cfg->avg, revision);
printf(" --hashlimit-burst %llu", cfg->burst);
}
if (cfg->mode & (XT_HASHLIMIT_HASH_SIP | XT_HASHLIMIT_HASH_SPT |
XT_HASHLIMIT_HASH_DIP | XT_HASHLIMIT_HASH_DPT)) {
fputs(" --hashlimit-mode", stdout);
print_mode(cfg->mode, ',');
}
printf(" --hashlimit-name %s", name);
if (cfg->size != 0)
printf(" --hashlimit-htable-size %u", cfg->size);
if (cfg->max != 0)
printf(" --hashlimit-htable-max %u", cfg->max);
if (cfg->gc_interval != XT_HASHLIMIT_GCINTERVAL)
printf(" --hashlimit-htable-gcinterval %u", cfg->gc_interval);
if (cfg->expire != quantum)
printf(" --hashlimit-htable-expire %u", cfg->expire);
if (cfg->srcmask != dmask)
printf(" --hashlimit-srcmask %u", cfg->srcmask);
if (cfg->dstmask != dmask)
printf(" --hashlimit-dstmask %u", cfg->dstmask);
if ((revision == 3) && (cfg->mode & XT_HASHLIMIT_RATE_MATCH))
printf(" --hashlimit-rate-match");
if ((revision == 3) && (cfg->mode & XT_HASHLIMIT_RATE_MATCH))
if (cfg->interval != 1)
printf(" --hashlimit-rate-interval %u", cfg->interval);
}
static void
hashlimit_mt4_save_v1(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo1 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 1);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_save(&cfg, info->name, 32, 1);
}
static void
hashlimit_mt6_save_v1(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo1 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 1);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_save(&cfg, info->name, 128, 1);
}
static void
hashlimit_mt4_save_v2(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo2 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 2);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_save(&cfg, info->name, 32, 2);
}
static void
hashlimit_mt6_save_v2(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo2 *info = (const void *)match->data;
struct hashlimit_cfg3 cfg;
int ret;
ret = cfg_copy(&cfg, (const void *)&info->cfg, 2);
if (ret)
xtables_error(OTHER_PROBLEM, "unknown revision");
hashlimit_mt_save(&cfg, info->name, 128, 2);
}
static void
hashlimit_mt4_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo3 *info = (const void *)match->data;
hashlimit_mt_save(&info->cfg, info->name, 32, 3);
}
static void
hashlimit_mt6_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_hashlimit_mtinfo3 *info = (const void *)match->data;
hashlimit_mt_save(&info->cfg, info->name, 128, 3);
}
static const struct rates rates_v1_xlate[] = {
{ "day", XT_HASHLIMIT_SCALE * 24 * 60 * 60 },
{ "hour", XT_HASHLIMIT_SCALE * 60 * 60 },
{ "minute", XT_HASHLIMIT_SCALE * 60 },
{ "second", XT_HASHLIMIT_SCALE } };
static const struct rates rates_xlate[] = {
{ "day", XT_HASHLIMIT_SCALE_v2 * 24 * 60 * 60 },
{ "hour", XT_HASHLIMIT_SCALE_v2 * 60 * 60 },
{ "minute", XT_HASHLIMIT_SCALE_v2 * 60 },
{ "second", XT_HASHLIMIT_SCALE_v2 } };
static void print_packets_rate_xlate(struct xt_xlate *xl, uint64_t avg,
int revision)
{
unsigned int i;
const struct rates *_rates = (revision == 1) ?
rates_v1_xlate : rates_xlate;
for (i = 1; i < ARRAY_SIZE(rates); ++i)
if (avg > _rates[i].mult ||
_rates[i].mult / avg < _rates[i].mult % avg)
break;
xt_xlate_add(xl, " %" PRIu64 "/%s ",
_rates[i-1].mult / avg, _rates[i-1].name);
}
static void print_bytes_rate_xlate(struct xt_xlate *xl,
const struct hashlimit_cfg3 *cfg)
{
unsigned int i;
unsigned long long r;
r = cost_to_bytes(cfg->avg);
for (i = 0; i < ARRAY_SIZE(units) -1; ++i)
if (r >= units[i].thresh &&
bytes_to_cost(r & ~(units[i].thresh - 1)) == cfg->avg)
break;
xt_xlate_add(xl, " %llu %sbytes/second", r / units[i].thresh,
units[i].name);
r *= cfg->burst;
for (i = 0; i < ARRAY_SIZE(units) -1; ++i)
if (r >= units[i].thresh)
break;
if (cfg->burst > 0)
xt_xlate_add(xl, " burst %llu %sbytes", r / units[i].thresh,
units[i].name);
}
static void hashlimit_print_subnet_xlate(struct xt_xlate *xl,
uint32_t nsub, int family)
{
char sep = (family == NFPROTO_IPV4) ? '.' : ':';
char *fmt = (family == NFPROTO_IPV4) ? "%u" : "%04x";
unsigned int nblocks = (family == NFPROTO_IPV4) ? 4 : 8;
unsigned int nbits = (family == NFPROTO_IPV4) ? 8 : 16;
unsigned int acm, i;
xt_xlate_add(xl, " and ");
while (nblocks--) {
acm = 0;
for (i = 0; i < nbits; i++) {
acm <<= 1;
if (nsub > 0) {
acm++;
nsub--;
}
}
xt_xlate_add(xl, fmt, acm);
if (nblocks > 0)
xt_xlate_add(xl, "%c", sep);
}
}
static const char *const hashlimit_modes4_xlate[] = {
[XT_HASHLIMIT_HASH_DIP] = "ip daddr",
[XT_HASHLIMIT_HASH_DPT] = "tcp dport",
[XT_HASHLIMIT_HASH_SIP] = "ip saddr",
[XT_HASHLIMIT_HASH_SPT] = "tcp sport",
};
static const char *const hashlimit_modes6_xlate[] = {
[XT_HASHLIMIT_HASH_DIP] = "ip6 daddr",
[XT_HASHLIMIT_HASH_DPT] = "tcp dport",
[XT_HASHLIMIT_HASH_SIP] = "ip6 saddr",
[XT_HASHLIMIT_HASH_SPT] = "tcp sport",
};
static int hashlimit_mode_xlate(struct xt_xlate *xl,
uint32_t mode, int family,
unsigned int nsrc, unsigned int ndst)
{
const char * const *_modes = (family == NFPROTO_IPV4) ?
hashlimit_modes4_xlate : hashlimit_modes6_xlate;
bool prevopt = false;
unsigned int mask;
mode &= ~XT_HASHLIMIT_INVERT & ~XT_HASHLIMIT_BYTES;
for (mask = 1; mode > 0; mask <<= 1) {
if (!(mode & mask))
continue;
if (!prevopt) {
xt_xlate_add(xl, " ");
prevopt = true;
}
else {
xt_xlate_add(xl, " . ");
}
xt_xlate_add(xl, "%s", _modes[mask]);
if (mask == XT_HASHLIMIT_HASH_DIP &&
((family == NFPROTO_IPV4 && ndst != 32) ||
(family == NFPROTO_IPV6 && ndst != 128)))
hashlimit_print_subnet_xlate(xl, ndst, family);
else if (mask == XT_HASHLIMIT_HASH_SIP &&
((family == NFPROTO_IPV4 && nsrc != 32) ||
(family == NFPROTO_IPV6 && nsrc != 128)))
hashlimit_print_subnet_xlate(xl, nsrc, family);
mode &= ~mask;
}
return prevopt;
}
static int hashlimit_mt_xlate(struct xt_xlate *xl, const char *name,
const struct hashlimit_cfg3 *cfg,
int revision, int family)
{
int ret = 1;
xt_xlate_add(xl, "meter %s {", name);
ret = hashlimit_mode_xlate(xl, cfg->mode, family,
cfg->srcmask, cfg->dstmask);
if (cfg->expire != 1000)
xt_xlate_add(xl, " timeout %us", cfg->expire / 1000);
xt_xlate_add(xl, " limit rate");
if (cfg->mode & XT_HASHLIMIT_INVERT)
xt_xlate_add(xl, " over");
if (cfg->mode & XT_HASHLIMIT_BYTES)
print_bytes_rate_xlate(xl, cfg);
else {
print_packets_rate_xlate(xl, cfg->avg, revision);
if (cfg->burst != XT_HASHLIMIT_BURST)
xt_xlate_add(xl, "burst %" PRIu64 " packets", (uint64_t)cfg->burst);
}
xt_xlate_add(xl, "}");
return ret;
}
static int hashlimit_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_info *info = (const void *)params->match->data;
int ret = 1;
xt_xlate_add(xl, "meter %s {", info->name);
ret = hashlimit_mode_xlate(xl, info->cfg.mode, NFPROTO_IPV4, 32, 32);
xt_xlate_add(xl, " timeout %us limit rate", info->cfg.expire / 1000);
print_packets_rate_xlate(xl, info->cfg.avg, 1);
xt_xlate_add(xl, " burst %u packets", info->cfg.burst);
xt_xlate_add(xl, "}");
return ret;
}
static int hashlimit_mt4_xlate_v1(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo1 *info =
(const void *)params->match->data;
struct hashlimit_cfg3 cfg;
if (cfg_copy(&cfg, (const void *)&info->cfg, 1))
xtables_error(OTHER_PROBLEM, "unknown revision");
return hashlimit_mt_xlate(xl, info->name, &cfg, 1, NFPROTO_IPV4);
}
static int hashlimit_mt6_xlate_v1(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo1 *info =
(const void *)params->match->data;
struct hashlimit_cfg3 cfg;
if (cfg_copy(&cfg, (const void *)&info->cfg, 1))
xtables_error(OTHER_PROBLEM, "unknown revision");
return hashlimit_mt_xlate(xl, info->name, &cfg, 1, NFPROTO_IPV6);
}
static int hashlimit_mt4_xlate_v2(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo2 *info =
(const void *)params->match->data;
struct hashlimit_cfg3 cfg;
if (cfg_copy(&cfg, (const void *)&info->cfg, 2))
xtables_error(OTHER_PROBLEM, "unknown revision");
return hashlimit_mt_xlate(xl, info->name, &cfg, 2, NFPROTO_IPV4);
}
static int hashlimit_mt6_xlate_v2(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo2 *info =
(const void *)params->match->data;
struct hashlimit_cfg3 cfg;
if (cfg_copy(&cfg, (const void *)&info->cfg, 2))
xtables_error(OTHER_PROBLEM, "unknown revision");
return hashlimit_mt_xlate(xl, info->name, &cfg, 2, NFPROTO_IPV6);
}
static int hashlimit_mt4_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo3 *info =
(const void *)params->match->data;
return hashlimit_mt_xlate(xl, info->name, &info->cfg, 3, NFPROTO_IPV4);
}
static int hashlimit_mt6_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_hashlimit_mtinfo3 *info =
(const void *)params->match->data;
return hashlimit_mt_xlate(xl, info->name, &info->cfg, 3, NFPROTO_IPV6);
}
static struct xtables_match hashlimit_mt_reg[] = {
{
.family = NFPROTO_UNSPEC,
.name = "hashlimit",
.version = XTABLES_VERSION,
.revision = 0,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_info)),
.userspacesize = offsetof(struct xt_hashlimit_info, hinfo),
.help = hashlimit_help,
.init = hashlimit_init,
.x6_parse = hashlimit_parse,
.x6_fcheck = hashlimit_check,
.print = hashlimit_print,
.save = hashlimit_save,
.x6_options = hashlimit_opts,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_xlate,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 1,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo1)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo1, hinfo),
.help = hashlimit_mt_help,
.init = hashlimit_mt4_init_v1,
.x6_parse = hashlimit_mt_parse_v1,
.x6_fcheck = hashlimit_mt_check_v1,
.print = hashlimit_mt4_print_v1,
.save = hashlimit_mt4_save_v1,
.x6_options = hashlimit_mt_opts_v1,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt4_xlate_v1,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 1,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo1)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo1, hinfo),
.help = hashlimit_mt_help,
.init = hashlimit_mt6_init_v1,
.x6_parse = hashlimit_mt_parse_v1,
.x6_fcheck = hashlimit_mt_check_v1,
.print = hashlimit_mt6_print_v1,
.save = hashlimit_mt6_save_v1,
.x6_options = hashlimit_mt_opts_v1,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt6_xlate_v1,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 2,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo2)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo2, hinfo),
.help = hashlimit_mt_help,
.init = hashlimit_mt4_init_v2,
.x6_parse = hashlimit_mt_parse_v2,
.x6_fcheck = hashlimit_mt_check_v2,
.print = hashlimit_mt4_print_v2,
.save = hashlimit_mt4_save_v2,
.x6_options = hashlimit_mt_opts_v2,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt4_xlate_v2,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 2,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo2)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo2, hinfo),
.help = hashlimit_mt_help,
.init = hashlimit_mt6_init_v2,
.x6_parse = hashlimit_mt_parse_v2,
.x6_fcheck = hashlimit_mt_check_v2,
.print = hashlimit_mt6_print_v2,
.save = hashlimit_mt6_save_v2,
.x6_options = hashlimit_mt_opts_v2,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt6_xlate_v2,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 3,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo3)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo3, hinfo),
.help = hashlimit_mt_help_v3,
.init = hashlimit_mt4_init,
.x6_parse = hashlimit_mt_parse,
.x6_fcheck = hashlimit_mt_check,
.print = hashlimit_mt4_print,
.save = hashlimit_mt4_save,
.x6_options = hashlimit_mt_opts,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt4_xlate,
},
{
.version = XTABLES_VERSION,
.name = "hashlimit",
.revision = 3,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_hashlimit_mtinfo3)),
.userspacesize = offsetof(struct xt_hashlimit_mtinfo3, hinfo),
.help = hashlimit_mt_help_v3,
.init = hashlimit_mt6_init,
.x6_parse = hashlimit_mt_parse,
.x6_fcheck = hashlimit_mt_check,
.print = hashlimit_mt6_print,
.save = hashlimit_mt6_save,
.x6_options = hashlimit_mt_opts,
.udata_size = sizeof(struct hashlimit_mt_udata),
.xlate = hashlimit_mt6_xlate,
},
};
void _init(void)
{
xtables_register_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg));
}