netfilter: xtables: "set" match and "SET" target support
The patch adds the combined module of the "SET" target and "set" match to netfilter. Both the previous and the current revisions are supported. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jozsef Kadlecsik
Patrick McHardy
Родитель
f830837f0e
Коммит
d956798d82
|
|
@ -0,0 +1,55 @@
|
|||
#ifndef _XT_SET_H
|
||||
#define _XT_SET_H
|
||||
|
||||
#include <linux/netfilter/ipset/ip_set.h>
|
||||
|
||||
/* Revision 0 interface: backward compatible with netfilter/iptables */
|
||||
|
||||
/*
|
||||
* Option flags for kernel operations (xt_set_info_v0)
|
||||
*/
|
||||
#define IPSET_SRC 0x01 /* Source match/add */
|
||||
#define IPSET_DST 0x02 /* Destination match/add */
|
||||
#define IPSET_MATCH_INV 0x04 /* Inverse matching */
|
||||
|
||||
struct xt_set_info_v0 {
|
||||
ip_set_id_t index;
|
||||
union {
|
||||
__u32 flags[IPSET_DIM_MAX + 1];
|
||||
struct {
|
||||
__u32 __flags[IPSET_DIM_MAX];
|
||||
__u8 dim;
|
||||
__u8 flags;
|
||||
} compat;
|
||||
} u;
|
||||
};
|
||||
|
||||
/* match and target infos */
|
||||
struct xt_set_info_match_v0 {
|
||||
struct xt_set_info_v0 match_set;
|
||||
};
|
||||
|
||||
struct xt_set_info_target_v0 {
|
||||
struct xt_set_info_v0 add_set;
|
||||
struct xt_set_info_v0 del_set;
|
||||
};
|
||||
|
||||
/* Revision 1: current interface to netfilter/iptables */
|
||||
|
||||
struct xt_set_info {
|
||||
ip_set_id_t index;
|
||||
__u8 dim;
|
||||
__u8 flags;
|
||||
};
|
||||
|
||||
/* match and target infos */
|
||||
struct xt_set_info_match {
|
||||
struct xt_set_info match_set;
|
||||
};
|
||||
|
||||
struct xt_set_info_target {
|
||||
struct xt_set_info add_set;
|
||||
struct xt_set_info del_set;
|
||||
};
|
||||
|
||||
#endif /*_XT_SET_H*/
|
||||
|
|
@ -352,6 +352,18 @@ config NETFILTER_XT_CONNMARK
|
|||
ctmark), similarly to the packet mark (nfmark). Using this
|
||||
target and match, you can set and match on this mark.
|
||||
|
||||
config NETFILTER_XT_SET
|
||||
tristate 'set target and match support'
|
||||
depends on IP_SET
|
||||
depends on NETFILTER_ADVANCED
|
||||
help
|
||||
This option adds the "SET" target and "set" match.
|
||||
|
||||
Using this target and match, you can add/delete and match
|
||||
elements in the sets created by ipset(8).
|
||||
|
||||
To compile it as a module, choose M here. If unsure, say N.
|
||||
|
||||
# alphabetically ordered list of targets
|
||||
|
||||
comment "Xtables targets"
|
||||
|
|
|
|||
|
|
@ -46,6 +46,7 @@ obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
|
|||
# combos
|
||||
obj-$(CONFIG_NETFILTER_XT_MARK) += xt_mark.o
|
||||
obj-$(CONFIG_NETFILTER_XT_CONNMARK) += xt_connmark.o
|
||||
obj-$(CONFIG_NETFILTER_XT_SET) += xt_set.o
|
||||
|
||||
# targets
|
||||
obj-$(CONFIG_NETFILTER_XT_TARGET_AUDIT) += xt_AUDIT.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,359 @@
|
|||
/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
|
||||
* Patrick Schaaf <bof@bof.de>
|
||||
* Martin Josefsson <gandalf@wlug.westbo.se>
|
||||
* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
/* Kernel module which implements the set match and SET target
|
||||
* for netfilter/iptables. */
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/version.h>
|
||||
|
||||
#include <linux/netfilter/x_tables.h>
|
||||
#include <linux/netfilter/xt_set.h>
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
|
||||
MODULE_DESCRIPTION("Xtables: IP set match and target module");
|
||||
MODULE_ALIAS("xt_SET");
|
||||
MODULE_ALIAS("ipt_set");
|
||||
MODULE_ALIAS("ip6t_set");
|
||||
MODULE_ALIAS("ipt_SET");
|
||||
MODULE_ALIAS("ip6t_SET");
|
||||
|
||||
static inline int
|
||||
match_set(ip_set_id_t index, const struct sk_buff *skb,
|
||||
u8 pf, u8 dim, u8 flags, int inv)
|
||||
{
|
||||
if (ip_set_test(index, skb, pf, dim, flags))
|
||||
inv = !inv;
|
||||
return inv;
|
||||
}
|
||||
|
||||
/* Revision 0 interface: backward compatible with netfilter/iptables */
|
||||
|
||||
static bool
|
||||
set_match_v0(const struct sk_buff *skb, struct xt_action_param *par)
|
||||
{
|
||||
const struct xt_set_info_match_v0 *info = par->matchinfo;
|
||||
|
||||
return match_set(info->match_set.index, skb, par->family,
|
||||
info->match_set.u.compat.dim,
|
||||
info->match_set.u.compat.flags,
|
||||
info->match_set.u.compat.flags & IPSET_INV_MATCH);
|
||||
}
|
||||
|
||||
static void
|
||||
compat_flags(struct xt_set_info_v0 *info)
|
||||
{
|
||||
u_int8_t i;
|
||||
|
||||
/* Fill out compatibility data according to enum ip_set_kopt */
|
||||
info->u.compat.dim = IPSET_DIM_ZERO;
|
||||
if (info->u.flags[0] & IPSET_MATCH_INV)
|
||||
info->u.compat.flags |= IPSET_INV_MATCH;
|
||||
for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) {
|
||||
info->u.compat.dim++;
|
||||
if (info->u.flags[i] & IPSET_SRC)
|
||||
info->u.compat.flags |= (1<<info->u.compat.dim);
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
set_match_v0_checkentry(const struct xt_mtchk_param *par)
|
||||
{
|
||||
struct xt_set_info_match_v0 *info = par->matchinfo;
|
||||
ip_set_id_t index;
|
||||
|
||||
index = ip_set_nfnl_get_byindex(info->match_set.index);
|
||||
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find set indentified by id %u to match\n",
|
||||
info->match_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) {
|
||||
pr_warning("Protocol error: set match dimension "
|
||||
"is over the limit!\n");
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
/* Fill out compatibility data */
|
||||
compat_flags(&info->match_set);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
set_match_v0_destroy(const struct xt_mtdtor_param *par)
|
||||
{
|
||||
struct xt_set_info_match_v0 *info = par->matchinfo;
|
||||
|
||||
ip_set_nfnl_put(info->match_set.index);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
set_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
|
||||
{
|
||||
const struct xt_set_info_target_v0 *info = par->targinfo;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID)
|
||||
ip_set_add(info->add_set.index, skb, par->family,
|
||||
info->add_set.u.compat.dim,
|
||||
info->add_set.u.compat.flags);
|
||||
if (info->del_set.index != IPSET_INVALID_ID)
|
||||
ip_set_del(info->del_set.index, skb, par->family,
|
||||
info->del_set.u.compat.dim,
|
||||
info->del_set.u.compat.flags);
|
||||
|
||||
return XT_CONTINUE;
|
||||
}
|
||||
|
||||
static int
|
||||
set_target_v0_checkentry(const struct xt_tgchk_param *par)
|
||||
{
|
||||
struct xt_set_info_target_v0 *info = par->targinfo;
|
||||
ip_set_id_t index;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID) {
|
||||
index = ip_set_nfnl_get_byindex(info->add_set.index);
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find add_set index %u as target\n",
|
||||
info->add_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
}
|
||||
|
||||
if (info->del_set.index != IPSET_INVALID_ID) {
|
||||
index = ip_set_nfnl_get_byindex(info->del_set.index);
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find del_set index %u as target\n",
|
||||
info->del_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
}
|
||||
if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 ||
|
||||
info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) {
|
||||
pr_warning("Protocol error: SET target dimension "
|
||||
"is over the limit!\n");
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
/* Fill out compatibility data */
|
||||
compat_flags(&info->add_set);
|
||||
compat_flags(&info->del_set);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
set_target_v0_destroy(const struct xt_tgdtor_param *par)
|
||||
{
|
||||
const struct xt_set_info_target_v0 *info = par->targinfo;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID)
|
||||
ip_set_nfnl_put(info->add_set.index);
|
||||
if (info->del_set.index != IPSET_INVALID_ID)
|
||||
ip_set_nfnl_put(info->del_set.index);
|
||||
}
|
||||
|
||||
/* Revision 1: current interface to netfilter/iptables */
|
||||
|
||||
static bool
|
||||
set_match(const struct sk_buff *skb, struct xt_action_param *par)
|
||||
{
|
||||
const struct xt_set_info_match *info = par->matchinfo;
|
||||
|
||||
return match_set(info->match_set.index, skb, par->family,
|
||||
info->match_set.dim,
|
||||
info->match_set.flags,
|
||||
info->match_set.flags & IPSET_INV_MATCH);
|
||||
}
|
||||
|
||||
static int
|
||||
set_match_checkentry(const struct xt_mtchk_param *par)
|
||||
{
|
||||
struct xt_set_info_match *info = par->matchinfo;
|
||||
ip_set_id_t index;
|
||||
|
||||
index = ip_set_nfnl_get_byindex(info->match_set.index);
|
||||
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find set indentified by id %u to match\n",
|
||||
info->match_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
if (info->match_set.dim > IPSET_DIM_MAX) {
|
||||
pr_warning("Protocol error: set match dimension "
|
||||
"is over the limit!\n");
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
set_match_destroy(const struct xt_mtdtor_param *par)
|
||||
{
|
||||
struct xt_set_info_match *info = par->matchinfo;
|
||||
|
||||
ip_set_nfnl_put(info->match_set.index);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
set_target(struct sk_buff *skb, const struct xt_action_param *par)
|
||||
{
|
||||
const struct xt_set_info_target *info = par->targinfo;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID)
|
||||
ip_set_add(info->add_set.index,
|
||||
skb, par->family,
|
||||
info->add_set.dim,
|
||||
info->add_set.flags);
|
||||
if (info->del_set.index != IPSET_INVALID_ID)
|
||||
ip_set_del(info->del_set.index,
|
||||
skb, par->family,
|
||||
info->add_set.dim,
|
||||
info->del_set.flags);
|
||||
|
||||
return XT_CONTINUE;
|
||||
}
|
||||
|
||||
static int
|
||||
set_target_checkentry(const struct xt_tgchk_param *par)
|
||||
{
|
||||
const struct xt_set_info_target *info = par->targinfo;
|
||||
ip_set_id_t index;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID) {
|
||||
index = ip_set_nfnl_get_byindex(info->add_set.index);
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find add_set index %u as target\n",
|
||||
info->add_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
}
|
||||
|
||||
if (info->del_set.index != IPSET_INVALID_ID) {
|
||||
index = ip_set_nfnl_get_byindex(info->del_set.index);
|
||||
if (index == IPSET_INVALID_ID) {
|
||||
pr_warning("Cannot find del_set index %u as target\n",
|
||||
info->del_set.index);
|
||||
return -ENOENT;
|
||||
}
|
||||
}
|
||||
if (info->add_set.dim > IPSET_DIM_MAX ||
|
||||
info->del_set.flags > IPSET_DIM_MAX) {
|
||||
pr_warning("Protocol error: SET target dimension "
|
||||
"is over the limit!\n");
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
set_target_destroy(const struct xt_tgdtor_param *par)
|
||||
{
|
||||
const struct xt_set_info_target *info = par->targinfo;
|
||||
|
||||
if (info->add_set.index != IPSET_INVALID_ID)
|
||||
ip_set_nfnl_put(info->add_set.index);
|
||||
if (info->del_set.index != IPSET_INVALID_ID)
|
||||
ip_set_nfnl_put(info->del_set.index);
|
||||
}
|
||||
|
||||
static struct xt_match set_matches[] __read_mostly = {
|
||||
{
|
||||
.name = "set",
|
||||
.family = NFPROTO_IPV4,
|
||||
.revision = 0,
|
||||
.match = set_match_v0,
|
||||
.matchsize = sizeof(struct xt_set_info_match_v0),
|
||||
.checkentry = set_match_v0_checkentry,
|
||||
.destroy = set_match_v0_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
{
|
||||
.name = "set",
|
||||
.family = NFPROTO_IPV4,
|
||||
.revision = 1,
|
||||
.match = set_match,
|
||||
.matchsize = sizeof(struct xt_set_info_match),
|
||||
.checkentry = set_match_checkentry,
|
||||
.destroy = set_match_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
{
|
||||
.name = "set",
|
||||
.family = NFPROTO_IPV6,
|
||||
.revision = 1,
|
||||
.match = set_match,
|
||||
.matchsize = sizeof(struct xt_set_info_match),
|
||||
.checkentry = set_match_checkentry,
|
||||
.destroy = set_match_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
};
|
||||
|
||||
static struct xt_target set_targets[] __read_mostly = {
|
||||
{
|
||||
.name = "SET",
|
||||
.revision = 0,
|
||||
.family = NFPROTO_IPV4,
|
||||
.target = set_target_v0,
|
||||
.targetsize = sizeof(struct xt_set_info_target_v0),
|
||||
.checkentry = set_target_v0_checkentry,
|
||||
.destroy = set_target_v0_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
{
|
||||
.name = "SET",
|
||||
.revision = 1,
|
||||
.family = NFPROTO_IPV4,
|
||||
.target = set_target,
|
||||
.targetsize = sizeof(struct xt_set_info_target),
|
||||
.checkentry = set_target_checkentry,
|
||||
.destroy = set_target_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
{
|
||||
.name = "SET",
|
||||
.revision = 1,
|
||||
.family = NFPROTO_IPV6,
|
||||
.target = set_target,
|
||||
.targetsize = sizeof(struct xt_set_info_target),
|
||||
.checkentry = set_target_checkentry,
|
||||
.destroy = set_target_destroy,
|
||||
.me = THIS_MODULE
|
||||
},
|
||||
};
|
||||
|
||||
static int __init xt_set_init(void)
|
||||
{
|
||||
int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));
|
||||
|
||||
if (!ret) {
|
||||
ret = xt_register_targets(set_targets,
|
||||
ARRAY_SIZE(set_targets));
|
||||
if (ret)
|
||||
xt_unregister_matches(set_matches,
|
||||
ARRAY_SIZE(set_matches));
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit xt_set_fini(void)
|
||||
{
|
||||
xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
|
||||
xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
|
||||
}
|
||||
|
||||
module_init(xt_set_init);
|
||||
module_exit(xt_set_fini);
|
||||
Загрузка…
Ссылка в новой задаче