You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
356 lines
11 KiB
356 lines
11 KiB
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <xtables.h>
|
|
#include <linux/netfilter/xt_recent.h>
|
|
|
|
enum {
|
|
O_SET = 0,
|
|
O_RCHECK,
|
|
O_UPDATE,
|
|
O_REMOVE,
|
|
O_SECONDS,
|
|
O_REAP,
|
|
O_HITCOUNT,
|
|
O_RTTL,
|
|
O_NAME,
|
|
O_RSOURCE,
|
|
O_RDEST,
|
|
O_MASK,
|
|
F_SET = 1 << O_SET,
|
|
F_RCHECK = 1 << O_RCHECK,
|
|
F_UPDATE = 1 << O_UPDATE,
|
|
F_REMOVE = 1 << O_REMOVE,
|
|
F_SECONDS = 1 << O_SECONDS,
|
|
F_ANY_OP = F_SET | F_RCHECK | F_UPDATE | F_REMOVE,
|
|
};
|
|
|
|
#define s struct xt_recent_mtinfo
|
|
static const struct xt_option_entry recent_opts_v0[] = {
|
|
{.name = "set", .id = O_SET, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "rcheck", .id = O_RCHECK, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "update", .id = O_UPDATE, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "remove", .id = O_REMOVE, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "seconds", .id = O_SECONDS, .type = XTTYPE_UINT32,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, seconds), .min = 1},
|
|
{.name = "reap", .id = O_REAP, .type = XTTYPE_NONE,
|
|
.also = F_SECONDS },
|
|
{.name = "hitcount", .id = O_HITCOUNT, .type = XTTYPE_UINT32,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, hit_count)},
|
|
{.name = "rttl", .id = O_RTTL, .type = XTTYPE_NONE,
|
|
.excl = F_SET | F_REMOVE},
|
|
{.name = "name", .id = O_NAME, .type = XTTYPE_STRING,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, name)},
|
|
{.name = "rsource", .id = O_RSOURCE, .type = XTTYPE_NONE},
|
|
{.name = "rdest", .id = O_RDEST, .type = XTTYPE_NONE},
|
|
XTOPT_TABLEEND,
|
|
};
|
|
#undef s
|
|
|
|
#define s struct xt_recent_mtinfo_v1
|
|
static const struct xt_option_entry recent_opts_v1[] = {
|
|
{.name = "set", .id = O_SET, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "rcheck", .id = O_RCHECK, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "update", .id = O_UPDATE, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "remove", .id = O_REMOVE, .type = XTTYPE_NONE,
|
|
.excl = F_ANY_OP, .flags = XTOPT_INVERT},
|
|
{.name = "seconds", .id = O_SECONDS, .type = XTTYPE_UINT32,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, seconds), .min = 1},
|
|
{.name = "reap", .id = O_REAP, .type = XTTYPE_NONE,
|
|
.also = F_SECONDS },
|
|
{.name = "hitcount", .id = O_HITCOUNT, .type = XTTYPE_UINT32,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, hit_count)},
|
|
{.name = "rttl", .id = O_RTTL, .type = XTTYPE_NONE,
|
|
.excl = F_SET | F_REMOVE},
|
|
{.name = "name", .id = O_NAME, .type = XTTYPE_STRING,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, name)},
|
|
{.name = "rsource", .id = O_RSOURCE, .type = XTTYPE_NONE},
|
|
{.name = "rdest", .id = O_RDEST, .type = XTTYPE_NONE},
|
|
{.name = "mask", .id = O_MASK, .type = XTTYPE_HOST,
|
|
.flags = XTOPT_PUT, XTOPT_POINTER(s, mask)},
|
|
XTOPT_TABLEEND,
|
|
};
|
|
#undef s
|
|
|
|
static void recent_help(void)
|
|
{
|
|
printf(
|
|
"recent match options:\n"
|
|
"[!] --set Add source address to list, always matches.\n"
|
|
"[!] --rcheck Match if source address in list.\n"
|
|
"[!] --update Match if source address in list, also update last-seen time.\n"
|
|
"[!] --remove Match if source address in list, also removes that address from list.\n"
|
|
" --seconds seconds For check and update commands above.\n"
|
|
" Specifies that the match will only occur if source address last seen within\n"
|
|
" the last 'seconds' seconds.\n"
|
|
" --reap Purge entries older then 'seconds'.\n"
|
|
" Can only be used in conjunction with the seconds option.\n"
|
|
" --hitcount hits For check and update commands above.\n"
|
|
" Specifies that the match will only occur if source address seen hits times.\n"
|
|
" May be used in conjunction with the seconds option.\n"
|
|
" --rttl For check and update commands above.\n"
|
|
" Specifies that the match will only occur if the source address and the TTL\n"
|
|
" match between this packet and the one which was set.\n"
|
|
" Useful if you have problems with people spoofing their source address in order\n"
|
|
" to DoS you via this module.\n"
|
|
" --name name Name of the recent list to be used. DEFAULT used if none given.\n"
|
|
" --rsource Match/Save the source address of each packet in the recent list table (default).\n"
|
|
" --rdest Match/Save the destination address of each packet in the recent list table.\n"
|
|
" --mask netmask Netmask that will be applied to this recent list.\n"
|
|
"xt_recent by: Stephen Frost <sfrost@snowman.net>.\n");
|
|
}
|
|
|
|
enum {
|
|
XT_RECENT_REV_0 = 0,
|
|
XT_RECENT_REV_1,
|
|
};
|
|
|
|
static void recent_init(struct xt_entry_match *match, unsigned int rev)
|
|
{
|
|
struct xt_recent_mtinfo *info = (struct xt_recent_mtinfo *)match->data;
|
|
struct xt_recent_mtinfo_v1 *info_v1 =
|
|
(struct xt_recent_mtinfo_v1 *)match->data;
|
|
|
|
strncpy(info->name,"DEFAULT", XT_RECENT_NAME_LEN);
|
|
/* even though XT_RECENT_NAME_LEN is currently defined as 200,
|
|
* better be safe, than sorry */
|
|
info->name[XT_RECENT_NAME_LEN-1] = '\0';
|
|
info->side = XT_RECENT_SOURCE;
|
|
if (rev == XT_RECENT_REV_1)
|
|
memset(&info_v1->mask, 0xFF, sizeof(info_v1->mask));
|
|
}
|
|
|
|
static void recent_parse(struct xt_option_call *cb)
|
|
{
|
|
struct xt_recent_mtinfo *info = cb->data;
|
|
|
|
xtables_option_parse(cb);
|
|
switch (cb->entry->id) {
|
|
case O_SET:
|
|
info->check_set |= XT_RECENT_SET;
|
|
if (cb->invert)
|
|
info->invert = true;
|
|
break;
|
|
case O_RCHECK:
|
|
info->check_set |= XT_RECENT_CHECK;
|
|
if (cb->invert)
|
|
info->invert = true;
|
|
break;
|
|
case O_UPDATE:
|
|
info->check_set |= XT_RECENT_UPDATE;
|
|
if (cb->invert)
|
|
info->invert = true;
|
|
break;
|
|
case O_REMOVE:
|
|
info->check_set |= XT_RECENT_REMOVE;
|
|
if (cb->invert)
|
|
info->invert = true;
|
|
break;
|
|
case O_RTTL:
|
|
info->check_set |= XT_RECENT_TTL;
|
|
break;
|
|
case O_RSOURCE:
|
|
info->side = XT_RECENT_SOURCE;
|
|
break;
|
|
case O_RDEST:
|
|
info->side = XT_RECENT_DEST;
|
|
break;
|
|
case O_REAP:
|
|
info->check_set |= XT_RECENT_REAP;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void recent_check(struct xt_fcheck_call *cb)
|
|
{
|
|
if (!(cb->xflags & F_ANY_OP))
|
|
xtables_error(PARAMETER_PROBLEM,
|
|
"recent: you must specify one of `--set', `--rcheck' "
|
|
"`--update' or `--remove'");
|
|
}
|
|
|
|
static void recent_print(const void *ip, const struct xt_entry_match *match,
|
|
unsigned int family)
|
|
{
|
|
const struct xt_recent_mtinfo_v1 *info = (const void *)match->data;
|
|
|
|
if (info->invert)
|
|
printf(" !");
|
|
|
|
printf(" recent:");
|
|
if (info->check_set & XT_RECENT_SET)
|
|
printf(" SET");
|
|
if (info->check_set & XT_RECENT_CHECK)
|
|
printf(" CHECK");
|
|
if (info->check_set & XT_RECENT_UPDATE)
|
|
printf(" UPDATE");
|
|
if (info->check_set & XT_RECENT_REMOVE)
|
|
printf(" REMOVE");
|
|
if(info->seconds) printf(" seconds: %d", info->seconds);
|
|
if (info->check_set & XT_RECENT_REAP)
|
|
printf(" reap");
|
|
if(info->hit_count) printf(" hit_count: %d", info->hit_count);
|
|
if (info->check_set & XT_RECENT_TTL)
|
|
printf(" TTL-Match");
|
|
printf(" name: %s", info->name);
|
|
if (info->side == XT_RECENT_SOURCE)
|
|
printf(" side: source");
|
|
if (info->side == XT_RECENT_DEST)
|
|
printf(" side: dest");
|
|
|
|
switch(family) {
|
|
case NFPROTO_IPV4:
|
|
printf(" mask: %s",
|
|
xtables_ipaddr_to_numeric(&info->mask.in));
|
|
break;
|
|
case NFPROTO_IPV6:
|
|
printf(" mask: %s",
|
|
xtables_ip6addr_to_numeric(&info->mask.in6));
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void recent_save(const void *ip, const struct xt_entry_match *match,
|
|
unsigned int family)
|
|
{
|
|
const struct xt_recent_mtinfo_v1 *info = (const void *)match->data;
|
|
|
|
if (info->invert)
|
|
printf(" !");
|
|
|
|
if (info->check_set & XT_RECENT_SET)
|
|
printf(" --set");
|
|
if (info->check_set & XT_RECENT_CHECK)
|
|
printf(" --rcheck");
|
|
if (info->check_set & XT_RECENT_UPDATE)
|
|
printf(" --update");
|
|
if (info->check_set & XT_RECENT_REMOVE)
|
|
printf(" --remove");
|
|
if(info->seconds) printf(" --seconds %d", info->seconds);
|
|
if (info->check_set & XT_RECENT_REAP)
|
|
printf(" --reap");
|
|
if(info->hit_count) printf(" --hitcount %d", info->hit_count);
|
|
if (info->check_set & XT_RECENT_TTL)
|
|
printf(" --rttl");
|
|
printf(" --name %s",info->name);
|
|
|
|
switch(family) {
|
|
case NFPROTO_IPV4:
|
|
printf(" --mask %s",
|
|
xtables_ipaddr_to_numeric(&info->mask.in));
|
|
break;
|
|
case NFPROTO_IPV6:
|
|
printf(" --mask %s",
|
|
xtables_ip6addr_to_numeric(&info->mask.in6));
|
|
break;
|
|
}
|
|
|
|
if (info->side == XT_RECENT_SOURCE)
|
|
printf(" --rsource");
|
|
if (info->side == XT_RECENT_DEST)
|
|
printf(" --rdest");
|
|
}
|
|
|
|
static void recent_init_v0(struct xt_entry_match *match)
|
|
{
|
|
recent_init(match, XT_RECENT_REV_0);
|
|
}
|
|
|
|
static void recent_init_v1(struct xt_entry_match *match)
|
|
{
|
|
recent_init(match, XT_RECENT_REV_1);
|
|
}
|
|
|
|
static void recent_save_v0(const void *ip, const struct xt_entry_match *match)
|
|
{
|
|
recent_save(ip, match, NFPROTO_UNSPEC);
|
|
}
|
|
|
|
static void recent_save_v4(const void *ip, const struct xt_entry_match *match)
|
|
{
|
|
recent_save(ip, match, NFPROTO_IPV4);
|
|
}
|
|
|
|
static void recent_save_v6(const void *ip, const struct xt_entry_match *match)
|
|
{
|
|
recent_save(ip, match, NFPROTO_IPV6);
|
|
}
|
|
|
|
static void recent_print_v0(const void *ip, const struct xt_entry_match *match,
|
|
int numeric)
|
|
{
|
|
recent_print(ip, match, NFPROTO_UNSPEC);
|
|
}
|
|
|
|
static void recent_print_v4(const void *ip, const struct xt_entry_match *match,
|
|
int numeric)
|
|
{
|
|
recent_print(ip, match, NFPROTO_IPV4);
|
|
}
|
|
|
|
static void recent_print_v6(const void *ip, const struct xt_entry_match *match,
|
|
int numeric)
|
|
{
|
|
recent_print(ip, match, NFPROTO_IPV6);
|
|
}
|
|
|
|
static struct xtables_match recent_mt_reg[] = {
|
|
{
|
|
.name = "recent",
|
|
.version = XTABLES_VERSION,
|
|
.revision = 0,
|
|
.family = NFPROTO_UNSPEC,
|
|
.size = XT_ALIGN(sizeof(struct xt_recent_mtinfo)),
|
|
.userspacesize = XT_ALIGN(sizeof(struct xt_recent_mtinfo)),
|
|
.help = recent_help,
|
|
.init = recent_init_v0,
|
|
.x6_parse = recent_parse,
|
|
.x6_fcheck = recent_check,
|
|
.print = recent_print_v0,
|
|
.save = recent_save_v0,
|
|
.x6_options = recent_opts_v0,
|
|
},
|
|
{
|
|
.name = "recent",
|
|
.version = XTABLES_VERSION,
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV4,
|
|
.size = XT_ALIGN(sizeof(struct xt_recent_mtinfo_v1)),
|
|
.userspacesize = XT_ALIGN(sizeof(struct xt_recent_mtinfo_v1)),
|
|
.help = recent_help,
|
|
.init = recent_init_v1,
|
|
.x6_parse = recent_parse,
|
|
.x6_fcheck = recent_check,
|
|
.print = recent_print_v4,
|
|
.save = recent_save_v4,
|
|
.x6_options = recent_opts_v1,
|
|
},
|
|
{
|
|
.name = "recent",
|
|
.version = XTABLES_VERSION,
|
|
.revision = 1,
|
|
.family = NFPROTO_IPV6,
|
|
.size = XT_ALIGN(sizeof(struct xt_recent_mtinfo_v1)),
|
|
.userspacesize = XT_ALIGN(sizeof(struct xt_recent_mtinfo_v1)),
|
|
.help = recent_help,
|
|
.init = recent_init_v1,
|
|
.x6_parse = recent_parse,
|
|
.x6_fcheck = recent_check,
|
|
.print = recent_print_v6,
|
|
.save = recent_save_v6,
|
|
.x6_options = recent_opts_v1,
|
|
},
|
|
};
|
|
|
|
void _init(void)
|
|
{
|
|
xtables_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
|
|
}
|