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20 Commits
v2.2 ... v2.3

Author SHA1 Message Date
Jan Engelhardt
29f293743a Xtables-addons 2.3 2013-06-18 08:09:18 +02:00
Jan Engelhardt
3bf7ebc48c xt_pknock: support for Linux 3.10 2013-06-18 08:09:18 +02:00
Jan Engelhardt
172bc7e306 xt_quota2: support for Linux 3.10 2013-06-18 08:09:18 +02:00
Jan Engelhardt
db45bbcb9e xt_condition: support for Linux 3.10 2013-06-18 08:09:18 +02:00
Jan Engelhardt
b2cd0ab65b xt_DNETMAP: support for Linux 3.10 2013-06-18 08:09:16 +02:00
Jan Engelhardt
b5a2f9aa14 compat_xtables: dissolve unusued rt_dst 2013-06-08 15:27:34 +02:00
Jan Engelhardt
6fbb35d686 extensions: resolve compile error when CONFIG_UIDGID_STRICT_TYPE_CHECKS=y
xt_DNETMAP.c: In function "dnetmap_tg_check":
xt_DNETMAP.c:331:16: error: incompatible types when assigning to
type "kuid_t" from type "unsigned int"
xt_DNETMAP.c:332:16: error: incompatible types when assigning to
type "kgid_t" from type "unsigned int"
xt_DNETMAP.c:344:16: error: incompatible types when assigning to
type "kuid_t" from type "unsigned int"
xt_DNETMAP.c:345:16: error: incompatible types when assigning to
type "kgid_t" from type "unsigned int"
xt_condition.c: In function "condition_mt_check":
xt_condition.c:158:24: error: incompatible types when assigning to
type "kuid_t" from type "unsigned int"
xt_condition.c:159:24: error: incompatible types when assigning to
type "kgid_t" from type "unsigned int"
xt_quota2.c: In function "q2_get_counter":
xt_quota2.c:134:18: error: incompatible types when assigning to type
"kuid_t" from type "unsigned int"
xt_quota2.c:135:18: error: incompatible types when assigning to type
"kgid_t" from type "unsigned int"
2013-06-08 15:10:20 +02:00
Dmitry Smirnov
e1d9825475 scripts: avoid bashism in xt_geoip_dl
xt_geoip_dl is marked to use /bin/sh. As such, avoid bashisms.
2013-06-02 17:29:12 +02:00
Dmitry Smirnov
efa8b9670a build: only scan manpages in extensions/
When using quilt to apply some patch to manpages, files named
libxt_*.man can appear within $srcdir/.pc which will be found by our
find(1) call. Limit the search to $srcdir/extensions to avoid this.
2013-06-02 17:18:58 +02:00
Jan Engelhardt
2b38d081a5 doc: spelling and grammar corrections to DNETMAP 2013-06-02 17:13:25 +02:00
Jan Engelhardt
fda591dba4 doc: replace apostrophes by proper situation-dependent puncutation 2013-06-02 16:59:44 +02:00
Jan Engelhardt
9de3027c02 doc: dissolve contractions 2013-06-02 16:59:14 +02:00
Jan Engelhardt
2dc8f21476 doc: more escapes for minuses 2013-06-02 16:57:50 +02:00
Jan Engelhardt
e027089782 doc: markup paragraphs 2013-06-02 16:53:56 +02:00
Dmitry Smirnov
fe7a30c746 doc: lint man pages (hyphens and spelling)
* hyphen-used-as-minus-sign
* spelling-error-in-manpage
2013-06-02 16:49:12 +02:00
Jan Engelhardt
d582cc04df build: remove manpage files during make clean 2013-06-02 16:48:56 +02:00
Jan Engelhardt
13db8d78c9 extensions: make print (iptables -L) output the same as save (-S) 2013-05-30 17:16:56 +02:00
Денис Устименко
6a60b5ab75 xt_quota2: print "!" at the correct position during iptables-save 2013-05-30 17:04:47 +02:00
Jan Engelhardt
d48a5fe0f4 xt_geoip: do not throw a warnings when country database is size 0 2013-05-30 17:00:25 +02:00
Dmitry Popov
b70905e7cb xt_RAWNAT: skb writable part might not include whole L4 header (IPv4 case)
Consider TCP/IPv4 packet with IP options: sizeof(*iph) + sizeof(struct
tcphdr) is not enough to include tcp checksum. It may hurt if this
packet is fragmented.

Therefore, we should use iph->ihl * 4 instead of sizeof(*iph).

Signed-off-by: Dmitry Popov <dp@highloadlab.com>
2013-05-08 13:21:54 +02:00
59 changed files with 477 additions and 557 deletions

View File

@@ -14,6 +14,11 @@ xtables-addons.8: FORCE
install-exec-hook:
depmod -a || :;
clean-local-mans:
${MAKE} -f Makefile.mans clean;
clean-local: clean-local-mans
config.status: Makefile.iptrules.in
tmpdir := $(shell mktemp -dtu)

View File

@@ -3,8 +3,8 @@
srcdir := @srcdir@
wcman_matches := $(shell find "${srcdir}" -name 'libxt_[a-z]*.man' | sort)
wcman_targets := $(shell find "${srcdir}" -name 'libxt_[A-Z]*.man' | sort)
wcman_matches := $(shell find "${srcdir}/extensions" -name 'libxt_[a-z]*.man' -print | sort)
wcman_targets := $(shell find "${srcdir}/extensions" -name 'libxt_[A-Z]*.man' -print | sort)
wlist_matches := $(patsubst ${srcdir}/libxt_%.man,%,${wcman_matches})
wlist_targets := $(patsubst ${srcdir}/libxt_%.man,%,${wcman_targets})
@@ -38,3 +38,6 @@ matches.man: .manpages.lst ${wcman_matches}
targets.man: .manpages.lst ${wcman_targets}
$(call man_run,${wlist_targets})
clean:
rm -f xtables-addons.8 matches.man targets.man

View File

@@ -1,4 +1,4 @@
AC_INIT([xtables-addons], [2.2])
AC_INIT([xtables-addons], [2.3])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
@@ -63,7 +63,7 @@ if test -n "$kbuilddir"; then
echo "WARNING: Version detection did not succeed. Continue at own luck.";
else
echo "$kmajor.$kminor.$kmicro.$kstable in $kbuilddir";
if test "$kmajor" -gt 3 -o "$kmajor" -eq 3 -a "$kminor" -gt 9; then
if test "$kmajor" -gt 3 -o "$kmajor" -eq 3 -a "$kminor" -gt 10; then
echo "WARNING: That kernel version is not officially supported yet. Continue at own luck.";
elif test "$kmajor" -eq 3 -a "$kminor" -ge 7; then
:;

View File

@@ -3,6 +3,20 @@ HEAD
====
v2.3 (2013-06-18)
=================
Enhancements:
- Support for Linux 3.10
Fixes:
- xt_DNETMAP, xt_condition, xt_quota2: resolve compile error when
CONFIG_UIDGID_STRICT_TYPE_CHECKS=y
- xt_RAWNAT: ensure correct operation in the presence of IPv4 options
- xt_geoip: do not throw a warnings when country database is size 0
- xt_quota2: print "!" at the correct position during iptables-save
Changes:
- Make print (iptables -L) output the same as save (-S)
v2.2 (2013-03-31)
=================
Enhancements:

View File

@@ -24,8 +24,6 @@
#define ipt_unregister_table(tbl) ipt_unregister_table(&init_net, (tbl))
#define ip6t_unregister_table(tbl) ip6t_unregister_table(&init_net, (tbl))
#define rt_dst(rt) (&(rt)->dst)
#if !defined(NIP6) && !defined(NIP6_FMT)
# define NIP6(addr) \
ntohs((addr).s6_addr16[0]), \
@@ -57,4 +55,31 @@
#define xt_request_find_match xtnu_request_find_match
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)
static inline struct inode *file_inode(struct file *f)
{
return f->f_path.dentry->d_inode;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
static inline void
proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid)
{
de->uid = uid;
de->gid = gid;
}
static inline void *PDE_DATA(struct inode *inode)
{
return PDE(inode)->data;
}
static inline void proc_remove(struct proc_dir_entry *de)
{
if (de != NULL)
remove_proc_entry(de->name, de->parent);
}
#endif
#endif /* _XTABLES_COMPAT_H */

View File

@@ -64,21 +64,6 @@ static void chaos_tg_check(unsigned int flags)
"may be specified");
}
static void chaos_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_chaos_tginfo *info = (const void *)target->data;
switch (info->variant) {
case XTCHAOS_DELUDE:
printf(" DELUDE ");
break;
case XTCHAOS_TARPIT:
printf(" TARPIT ");
break;
}
}
static void chaos_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_chaos_tginfo *info = (const void *)target->data;
@@ -93,6 +78,13 @@ static void chaos_tg_save(const void *ip, const struct xt_entry_target *target)
}
}
static void chaos_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
printf(" -j CHAOS");
chaos_tg_save(ip, target);
}
static struct xtables_target chaos_tg_reg = {
.version = XTABLES_VERSION,
.name = "CHAOS",

View File

@@ -1,3 +1,4 @@
.PP
Causes confusion on the other end by doing odd things with incoming packets.
CHAOS will randomly reply (or not) with one of its configurable subtargets:
.TP

View File

@@ -1,3 +1,4 @@
.PP
The DELUDE target will reply to a SYN packet with SYN-ACK, and to all other
packets with an RST. This will terminate the connection much like REJECT, but
network scanners doing TCP half-open discovery can be spoofed to make them

View File

@@ -61,15 +61,6 @@ static void dhcpmac_tg_check(unsigned int flags)
"--set-mac parameter required");
}
static void dhcpmac_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct dhcpmac_info *info = (void *)target->data;
printf(" DHCPMAC %s" DH_MAC_FMT "/%u ",
info->invert ? "!" : "", DH_MAC_HEX(info->addr), info->mask);
}
static void dhcpmac_tg_save(const void *ip,
const struct xt_entry_target *target)
{
@@ -81,6 +72,13 @@ static void dhcpmac_tg_save(const void *ip,
DH_MAC_HEX(info->addr), info->mask);
}
static void dhcpmac_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
printf(" -j DHCPMAC");
dhcpmac_tg_save(ip, target);
}
static struct xtables_target dhcpmac_tg_reg = {
.version = XTABLES_VERSION,
.name = "DHCPMAC",

View File

@@ -1,3 +1,4 @@
.PP
In conjunction with ebtables, DHCPMAC can be used to completely change all MAC
addresses from and to a VMware-based virtual machine. This is needed because
VMware does not allow to set a non-VMware MAC address before an operating

View File

@@ -195,33 +195,6 @@ static void DNETMAP_print_addr(const void *ip,
printf("/%d", bits);
}
static void DNETMAP_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
struct xt_DNETMAP_tginfo *tginfo = (void *)&target->data;
const __u8 *flags = &tginfo->flags;
printf(" prefix ");
if (*flags & XT_DNETMAP_PREFIX)
DNETMAP_print_addr(ip, target, numeric);
else
printf("any");
if (*flags & XT_DNETMAP_REUSE)
printf(" reuse");
if (*flags & XT_DNETMAP_STATIC)
printf(" static");
if (*flags & XT_DNETMAP_PERSISTENT)
printf(" persistent");
if (*flags & XT_DNETMAP_TTL)
printf(" ttl %i", tginfo->ttl);
else
printf(" ttl default");
}
static void DNETMAP_save(const void *ip, const struct xt_entry_target *target)
{
struct xt_DNETMAP_tginfo *tginfo = (void *)&target->data;
@@ -246,6 +219,13 @@ static void DNETMAP_save(const void *ip, const struct xt_entry_target *target)
printf(" --ttl %i ", tginfo->ttl);
}
static void DNETMAP_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
printf(" -j DNETMAP");
DNETMAP_save(ip, target);
}
static struct xtables_target dnetmap_tg_reg = {
.name = MODULENAME,
.version = XTABLES_VERSION,

View File

@@ -1,172 +1,179 @@
The \fBDNETMAP\fR target allows dynamic two-way 1:1 mapping of IPv4 subnets.
Single rule can map private subnet to shorter public subnet creating and
maintaining unambigeous private-public ip bindings. Second rule can be used to
map new flows to private subnet according to maintained bindings. Target allows
efficient public IPv4 space usage and unambigeous NAT at the same time.
Target can be used only in \fBnat\fR table in \fBPOSTROUTING\fR or \fBOUTPUT\fR
chains for SNAT and in \fBPREROUTING\fR for DNAT. Only flows directed to bound
IPs will be DNATed. Packet continues chain traversal if there is no free
postnat-ip to be assigned to prenat-ip. Default binding \fBttl\fR is \fI10
minutes\fR and can be changed using \fBdefault_ttl\fR module option. Default ip
hash size is 256 and can be changed using \fBhash_size\fR module option.
.PP
The \fBDNETMAP\fR target allows dynamic two-way 1:1 mapping of IPv4 subnets. A
single rule can map a private subnet to a shorter public subnet, creating and
maintaining unambiguous private-public IP address bindings. The second rule can
be used to map new flows to a private subnet according to maintained bindings.
The target allows efficient public IPv4 space usage and unambiguous NAT at the
same time.
.PP
The target can be used only in the \fBnat\fR table in \fBPOSTROUTING\fR or
\fBOUTPUT\fR chains for SNAT, and in \fBPREROUTING\fR for DNAT. Only flows
directed to bound addresses will be DNATed. The packet continues chain
traversal if there is no free postnat address to be assigned to the prenat
address. The default binding \fBTTL\fR is \fI10 minutes\fR and can be changed
using the \fBdefault_ttl\fR module option. The default address hash size is 256
and can be changed using the \fBhash_size\fR module option.
.TP
\fB\-\-prefix\fR \fIaddr\fR\fB/\fR\fImask\fR
Network subnet to map to. If not specified, all existing prefixes are used.
The network subnet to map to. If not specified, all existing prefixes are used.
.TP
\fB\-\-reuse\fR
Reuse entry for given prenat-ip from any prefix despite bindings ttl < 0.
Reuse the entry for a given prenat address from any prefix even if the
binding's TTL is < 0.
.TP
\fB\-\-persistent\fR
Set prefix persistent. It won't be removed after deleting last iptables rule.
Option is effective only in the first rule for a given prefix. If you
need to change persistency for existing prefix, please use proc interface
described below.
Set the prefix to be persistent. It will not be removed after deleting the last
iptables rule. The option is effective only in the first rule for a given
prefix. If you need to change persistency for an existing prefix, please use
the procfs interface described below.
.TP
\fB\-\-static\fR
Don't create dynamic mappings using this rule. Use static mappings only. Note
that you need to create static mappings via proc interface for this rule with
this option to have any effect.
Do not create dynamic mappings using this rule. Use static mappings only. Note
that you need to create static mappings via the procfs interface for this rule
for this option to have any effect.
.TP
\fB\-\-ttl\fR \fIseconds\fR
Regenerate bindings ttl value to \fIseconds\fR. If negative value is specified,
bindings ttl is kept unchanged. If not specified then default ttl value (600s)
is used.
Reset the binding's TTL value to \fIseconds\fR. If a negative value is
specified, the binding's TTL is kept unchanged. If this option is not
specified, then the default TTL value (600s) is used.
.PP
\fB* /proc interface\fR
Module creates following entries for each new specified subnet:
.PP
The module creates the following entries for each new specified subnet:
.TP
\fB/proc/net/xt_DNETMAP/\fR\fIsubnet\fR\fB_\fR\fImask\fR
Contains binding table for subnet/mask. Each line contains \fBprenat-ip\fR,
\fBpostnat-ip\fR,\fBttl\fR (seconds till entry times out), \fBlasthit\fR (last
entry hit in seconds relative to system boot time). Please note that \fBttl\fR
and \fBlasthit\fR entries contain \fBS\fR in case of static binding.
Contains the binding table for the given \fIsubnet/mask\fP. Each line contains
\fBprenat address\fR, \fBpostnat address\fR, \fBttl\fR (seconds until the entry
times out), \fBlasthit\fR (last hit to the entry in seconds relative to system
boot time). Please note that the \fBttl\fR and \fBlasthit\fR entries contain an
'\fBS\fR' in case of a static binding.
.TP
\fB/proc/net/xt_DNETMAP/\fR\fIsubnet\fR\fB_\fR\fImask\fR\fB_stat\fR
Contains statistics for given subnet/mask. Line contains contains four
numerical values separated by spaces. First one is number of currently used
dynamic addresses (bindings with negative ttl excluded), second one is number
static assignments, third one is number of all usable addresses in subnet and
the fourth one is mean \fBttl\fR value for all active entries. If prefix has
persistent flag set it'll be noted as fifth entry.
Contains statistics for a given \fIsubnet/mask\fP. The line contains four
numerical values separated by spaces. The first one is the number of currently
used dynamic addresses (bindings with negative TTL excluded), the second one is
the number of static assignments, the third one is the number of all usable
addresses in the subnet, and the fourth one is the mean \fBTTL\fR value for all
active entries. If the prefix has the persistent flag set, it will be noted as
fifth entry.
.PP
Following write operations are supported via proc interface:
The following write operations are supported via the procfs interface:
.TP
echo "+\fIprenatIP\fR:\fIpostnatIP\fR" > \fB/proc/net/xt_DNETMAP/subnet_mask\fR
Adds static binding between prenatIP nad postnatIP. If postnatIP is already
bound, previous binding will be timedout immediatelly. Static binding is never
timedout.
echo "+\fIprenat-address\fR:\fIpostnat-address\fR" >\fB/proc/net/xt_DNETMAP/subnet_mask\fR
Adds a static binding between the prenat and postnap address. If
postnat_address is already bound, any previous binding will be timed out
immediately. A static binding is never timed out.
.TP
echo "-\fIIP\fR" > \fB/proc/net/xt_DNETMAP/subnet_mask\fR
Removes binding with \fIIP\fR as prenat or postnat address. If removed binding
is currently static, it'll make entry available for dynamic allocation.
echo "\-\fIaddress\fR" >\fB/proc/net/xt_DNETMAP/subnet_mask\fR
Removes the binding with \fIaddress\fR as prenat or postnat address. If the
removed binding is currently static, it will make the entry available for
dynamic allocation.
.TP
echo "+persistent" > \fB/proc/net/xt_DNETMAP/subnet_mask\fR
Sets persistent flag for prefix. It's usefull if you don't want bindings to get
flushed when firewall is restarted. You can check if prefix is persistent by
printing \fB/proc/net/xt_DNETMAP/\fR\fIsubnet\fR\fB_\fR\fImask\fR\fB_stat\fR
contents.
echo "+persistent" >\fB/proc/net/xt_DNETMAP/subnet_mask\fR
Sets the persistent flag for the prefix. It is useful if you do not want
bindings to get flushed when the firewall is restarted. You can check if the
prefix is persistent by printing the contents of
\fB/proc/net/xt_DNETMAP/\fR\fIsubnet\fR\fB_\fR\fImask\fR\fB_stat\fR.
.TP
echo "-persistent" > \fB/proc/net/xt_DNETMAP/subnet_mask\fR
Unsets persistent flag for prefix. In this mode prefix will be deleted if the
last iptables rule for that prefix is removed.
echo "\-persistent" >\fB/proc/net/xt_DNETMAP/subnet_mask\fR
Unsets the persistent flag for the prefix. In this mode, the prefix will be
deleted if the last iptables rule for that prefix is removed.
.TP
echo "flush" > \fB/proc/net/xt_DNETMAP/subnet_mask\fR
Flushes all bindings for specific prefix. All static entries are also flushed
and are available for dynamic bindings.
echo "flush" >\fB/proc/net/xt_DNETMAP/subnet_mask\fR
Flushes all bindings for the specific prefix. All static entries are also
flushed and become available for dynamic bindings.
.PP
Note! Entries are removed if the last iptables rule for a specific prefix is
deleted unless there's persistent flag set.
deleted unless the persistent flag is set.
.PP
\fB* Logging\fR
Module logs binding add/timeout events to klog. This behaviour can be disabled
using \fBdisable_log\fR module parameter.
.PP
The module logs binding add/timeout events to klog. This behaviour can be
disabled using the \fBdisable_log\fR module parameter.
.PP
\fB* Examples\fR
.PP
\fB1.\fR Map subnet 192.168.0.0/24 to subnets 20.0.0.0/26. SNAT only:
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 20.0.0.0/26
Active hosts from 192.168.0.0/24 subnet are mapped to 20.0.0.0/26. If packet
from not yet bound prenat-ip hits the rule and there are no free or timed-out
(ttl<0) entries in prefix 20.0.0.0/28, then notice is logged to klog and chain
traversal continues. If packet from already bound prenat-ip hits the rule,
bindings ttl value is regenerated to default_ttl and SNAT is performed.
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 20.0.0.0/26
.PP
Active hosts from the 192.168.0.0/24 subnet are mapped to 20.0.0.0/26. If the
packet from a not yet bound prenat address hits the rule and there are no free
or timed-out (TTL<0) entries in prefix 20.0.0.0/28, then a notice is logged to
klog and chain traversal continues. If packet from an already-bound prenat
address hits the rule, the binding's TTL value is reset to default_ttl and SNAT
is performed.
.PP
\fB2.\fR Use of \fB\-\-reuse\fR and \fB\-\-ttl\fR switches, multiple rule
interaction:
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix
20.0.0.0/26 --reuse --ttl 200
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 30.0.0.0/26
Active hosts from 192.168.0.0/24 subnet are mapped to 20.0.0.0/26 with ttl =
200 seconds. If there are no free addresses in first prefix the next one
(30.0.0.0/26) is used with default ttl. It's important to note that the first
rule SNATs all flows whose source IP is already actively (ttl>0) bound to ANY
prefix. Parameter \fB\-\-reuse\fR makes this functionality work even for
inactive (ttl<0) entries.
If both subnets are exhaused, then chain traversal continues.
\fB3.\fR Map 192.168.0.0/24 to subnets 20.0.0.0/26 bidirectional way:
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 20.0.0.0/26
iptables -t nat -A PREROUTING -j DNETMAP
If host 192.168.0.10 generates some traffic, it gets bound to first free IP in
subnet - 20.0.0.0. Now any traffic directed to 20.0.0.0 gets DNATed to
192.168.0.10 as long as there's an active (ttl>0) binding. There's no need to
specify \fB\-\-prefix\fR parameter in PREROUTING rule, because this way it DNATs
traffic to all active prefixes. You could specify prefix it you'd like to make
DNAT work for specific prefix only.
\fB4.\fR Map 192.168.0.0/24 to subnets 20.0.0.0/26 with static assignments only:
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 20.0.0.0/26
--static
echo "+192.168.0.10:20.0.0.1" > /proc/net/xt_DNETMAP/20.0.0.0_26
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix
20.0.0.0/26 \-\-reuse \-\-ttl 200
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 30.0.0.0/26
.PP
Active hosts from 192.168.0.0/24 subnet are mapped to 20.0.0.0/26 with TTL =
200 seconds. If there are no free addresses in first prefix, the next one
(30.0.0.0/26) is used with the default TTL. It is important to note that the
first rule SNATs all flows whose source address is already actively bound
(TTL>0) to ANY prefix. The \fB\-\-reuse\fR parameter makes this functionality
work even for inactive (TTL<0) entries.
.PP
If both subnets are exhausted, then chain traversal continues.
.PP
\fB3.\fR Map 192.168.0.0/24 to subnets 20.0.0.0/26 in a bidirectional way:
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 20.0.0.0/26
.PP
iptables \-t nat \-A PREROUTING \-j DNETMAP
.PP
If the host 192.168.0.10 generates some traffic, it gets bound to first free
address in the subnet \(em 20.0.0.0. Now, any traffic directed to 20.0.0.0 gets
DNATed to 192.168.0.10 as long as there is an active (TTL>0) binding. There is
no need to specify \fB\-\-prefix\fR parameter in a PREROUTING rule, because
this way, it DNATs traffic to all active prefixes. You could specify the prefix
you would like to make DNAT work for a specific prefix only.
.PP
\fB4.\fR Map 192.168.0.0/24 to subnets 20.0.0.0/26 with static assignments
only:
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 20.0.0.0/26
\-\-static
.PP
echo "+192.168.0.10:20.0.0.1" >/proc/net/xt_DNETMAP/20.0.0.0_26
.br
echo "+192.168.0.11:20.0.0.2" > /proc/net/xt_DNETMAP/20.0.0.0_26
echo "+192.168.0.11:20.0.0.2" >/proc/net/xt_DNETMAP/20.0.0.0_26
.br
echo "+192.168.0.51:20.0.0.3" > /proc/net/xt_DNETMAP/20.0.0.0_26
echo "+192.168.0.51:20.0.0.3" >/proc/net/xt_DNETMAP/20.0.0.0_26
.PP
This configuration will allow only preconfigured static bindings to work due to
\fBstatic\fR rule option. Without this flag dynamic bindings would be created
using non-static entries.
the \fBstatic\fR rule option. Without this flag, dynamic bindings would be
created using non-static entries.
.PP
\fB5.\fR Persistent prefix:
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 20.0.0.0/26
--persistent
.PP
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 20.0.0.0/26
\-\-persistent
.br
\fBor\fR
.br
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j DNETMAP --prefix 20.0.0.0/26
iptables \-t nat \-A POSTROUTING \-s 192.168.0.0/24 \-j DNETMAP \-\-prefix 20.0.0.0/26
.br
echo "+persistent" > /proc/net/xt_DNETMAP/20.0.0.0_26
Now we can check persistent flag of the prefix:
echo "+persistent" >/proc/net/xt_DNETMAP/20.0.0.0_26
.PP
Now, we can check the persistent flag of the prefix:
.br
cat /proc/net/xt_DNETMAP/20.0.0.0_26
.br
0 0 64 0 \fBpersistent\fR
Flush iptables nat table and see that prefix is still in existence:
.PP
Flush the iptables nat table and see that prefix is still in existence:
.br
iptables -F -t nat
iptables \-F \-t nat
.br
ls -l /proc/net/xt_DNETMAP
ls \-l /proc/net/xt_DNETMAP
.br
-rw-r--r-- 1 root root 0 06-10 09:01 20.0.0.0_26
\-rw\-r\-\-r\-\- 1 root root 0 06\-10 09:01 20.0.0.0_26
.br
-rw-r--r-- 1 root root 0 06-10 09:01 20.0.0.0_26_stat
\-rw\-r\-\-r\-\- 1 root root 0 06\-10 09:01 20.0.0.0_26_stat
.

View File

@@ -1,3 +1,4 @@
.PP
The \fBECHO\fP target will send back all packets it received. It serves as an
examples for an Xtables target.
.PP

View File

@@ -112,25 +112,6 @@ static void ipmark_tg_check(unsigned int flags)
"IPMARK target: Parameter --addr is required");
}
static void
ipmark_tg_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_ipmark_tginfo *info = (const void *)target->data;
if (info->selector == XT_IPMARK_SRC)
printf(" IPMARK src ip ");
else
printf(" IPMARK dst ip ");
if (info->shift != 0)
printf(" shift %u ", (unsigned int)info->shift);
if (info->andmask != ~0U)
printf(" and 0x%x ", (unsigned int)info->andmask);
if (info->ormask != 0)
printf(" or 0x%x ", (unsigned int)info->ormask);
}
static void
ipmark_tg_save(const void *entry, const struct xt_entry_target *target)
{
@@ -149,6 +130,14 @@ ipmark_tg_save(const void *entry, const struct xt_entry_target *target)
printf(" --or-mask 0x%x ", (unsigned int)info->ormask);
}
static void
ipmark_tg_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j IPMARK");
ipmark_tg_save(entry, target);
}
static struct xtables_target ipmark_tg_reg = {
.version = XTABLES_VERSION,
.name = "IPMARK",

View File

@@ -1,7 +1,8 @@
.PP
Allows you to mark a received packet basing on its IP address. This
can replace many mangle/mark entries with only one, if you use
firewall based classifier.
.PP
This target is to be used inside the \fBmangle\fP table.
.TP
\fB\-\-addr\fP {\fBsrc\fP|\fBdst\fP}

View File

@@ -77,15 +77,6 @@ logmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
return false;
}
static void
logmark_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_logmark_tginfo *info = (void *)target->data;
printf(" LOGMARK level %u prefix \"%s\" ", info->level, info->prefix);
}
static void
logmark_tg_save(const void *ip, const struct xt_entry_target *target)
{
@@ -97,6 +88,14 @@ logmark_tg_save(const void *ip, const struct xt_entry_target *target)
printf(" --log-prefix \"%s\" ", info->prefix);
}
static void
logmark_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
printf(" -j LOGMARK");
logmark_tg_save(ip, target);
}
static struct xtables_target logmark_tg_reg = {
.version = XTABLES_VERSION,
.name = "LOGMARK",

View File

@@ -1,3 +1,4 @@
.PP
The LOGMARK target will log packet and connection marks to syslog.
.TP
\fB\-\-log\-level\fR \fIlevel\fR

View File

@@ -103,34 +103,6 @@ static void rawdnat_tg_check(unsigned int flags)
"\"--to-destination\" is required.");
}
static void
rawdnat_tg4_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_rawnat_tginfo *info = (const void *)target->data;
if (!numeric && info->mask == 32)
printf(" to-destination %s ",
xtables_ipaddr_to_anyname(&info->addr.in));
else
printf(" to-destination %s/%u ",
xtables_ipaddr_to_numeric(&info->addr.in), info->mask);
}
static void
rawdnat_tg6_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_rawnat_tginfo *info = (const void *)target->data;
if (!numeric && info->mask == 128)
printf(" to-destination %s ",
xtables_ip6addr_to_anyname(&info->addr.in6));
else
printf(" to-destination %s/%u ",
xtables_ip6addr_to_numeric(&info->addr.in6), info->mask);
}
static void
rawdnat_tg4_save(const void *entry, const struct xt_entry_target *target)
{
@@ -141,6 +113,14 @@ rawdnat_tg4_save(const void *entry, const struct xt_entry_target *target)
info->mask);
}
static void
rawdnat_tg4_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j RAWDNAT");
rawdnat_tg4_save(entry, target);
}
static void
rawdnat_tg6_save(const void *entry, const struct xt_entry_target *target)
{
@@ -151,6 +131,14 @@ rawdnat_tg6_save(const void *entry, const struct xt_entry_target *target)
info->mask);
}
static void
rawdnat_tg6_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j RAWDNAT");
rawdnat_tg6_save(entry, target);
}
static struct xtables_target rawdnat_tg_reg[] = {
{
.version = XTABLES_VERSION,

View File

@@ -1,9 +1,10 @@
.PP
The \fBRAWDNAT\fR target will rewrite the destination address in the IP header,
much like the \fBNETMAP\fR target.
.TP
\fB\-\-to\-destination\fR \fIaddr\fR[\fB/\fR\fImask\fR]
Network address to map to. The resulting address will be constructed the
following way: All 'one' bits in the \fImask\fR are filled in from the new
following way: All "one" bits in the \fImask\fR are filled in from the new
\fIaddress\fR. All bits that are zero in the mask are filled in from the
original address.
.PP

View File

@@ -103,34 +103,6 @@ static void rawsnat_tg_check(unsigned int flags)
"\"--to-source\" is required.");
}
static void
rawsnat_tg4_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_rawnat_tginfo *info = (const void *)target->data;
if (!numeric && info->mask == 32)
printf(" to-source %s ",
xtables_ipaddr_to_anyname(&info->addr.in));
else
printf(" to-source %s/%u ",
xtables_ipaddr_to_numeric(&info->addr.in), info->mask);
}
static void
rawsnat_tg6_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
const struct xt_rawnat_tginfo *info = (const void *)target->data;
if (!numeric && info->mask == 128)
printf(" to-source %s ",
xtables_ip6addr_to_anyname(&info->addr.in6));
else
printf(" to-source %s/%u ",
xtables_ip6addr_to_numeric(&info->addr.in6), info->mask);
}
static void
rawsnat_tg4_save(const void *entry, const struct xt_entry_target *target)
{
@@ -151,6 +123,22 @@ rawsnat_tg6_save(const void *entry, const struct xt_entry_target *target)
info->mask);
}
static void
rawsnat_tg4_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j RAWSNAT");
rawsnat_tg4_save(entry, target);
}
static void
rawsnat_tg6_print(const void *entry, const struct xt_entry_target *target,
int numeric)
{
printf(" -j RAWSNAT");
rawsnat_tg6_save(entry, target);
}
static struct xtables_target rawsnat_tg_reg[] = {
{
.version = XTABLES_VERSION,

View File

@@ -1,3 +1,4 @@
.PP
The \fBRAWSNAT\fR and \fBRAWDNAT\fP targets provide stateless network address
translation.
.PP
@@ -10,7 +11,7 @@ is that RAWNAT must happen outside of connection tracking.
.TP
\fB\-\-to\-source\fR \fIaddr\fR[\fB/\fR\fImask\fR]
Network address to map to. The resulting address will be constructed the
following way: All 'one' bits in the \fImask\fR are filled in from the new
following way: All "one" bits in the \fImask\fR are filled in from the new
\fIaddress\fR. All bits that are zero in the mask are filled in from the
original address.
.PP
@@ -25,7 +26,7 @@ it statically NATs packets, not connections, like the normal DNAT/SNAT targets
would do. Also note that it can transform already-NATed connections \(em as
said, it is completely external to Netfilter's connection tracking/NAT.
.PP
If the machine itself generates packets that are to be rawnat'ed, you need a
If the machine itself generates packets that are to be rawnat-ed, you need a
rule in the OUTPUT chain instead, just like you would with the stateful NAT
targets.
.PP

View File

@@ -1,2 +1,3 @@
.PP
Like the DROP target, but does not throw an error like DROP when used in the
\fBOUTPUT\fP chain.

View File

@@ -1,3 +1,4 @@
.PP
The SYSRQ target allows to remotely trigger sysrq on the local machine over the
network. This can be useful when vital parts of the machine hang, for example
an oops in a filesystem causing locks to be not released and processes to get

View File

@@ -67,24 +67,6 @@ static void tarpit_tg_check(unsigned int flags)
"TARPIT: only one action can be used at a time");
}
static void tarpit_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_tarpit_tginfo *info = (void *)target->data;
switch (info->variant) {
case XTTARPIT_HONEYPOT:
printf(" honeypot mode ");
break;
case XTTARPIT_RESET:
printf(" reset mode ");
break;
default:
printf(" tarpit mode ");
break;
}
}
static void tarpit_tg_save(const void *ip,
const struct xt_entry_target *target)
{
@@ -103,6 +85,13 @@ static void tarpit_tg_save(const void *ip,
}
}
static void tarpit_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
printf(" -j TARPIT");
tarpit_tg_save(ip, target);
}
static struct xtables_target tarpit_tg_reg = {
.version = XTABLES_VERSION,
.name = "TARPIT",

View File

@@ -1,3 +1,4 @@
.PP
Captures and holds incoming TCP connections using no local per-connection
resources.
.PP

View File

@@ -62,15 +62,6 @@ static void condition_check(unsigned int flags)
"Condition match: must specify --condition");
}
static void condition_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_condition_mtinfo *info = (const void *)match->data;
printf(" condition %s%s ", (info->invert) ? "!" : "", info->name);
}
static void condition_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_condition_mtinfo *info = (const void *)match->data;
@@ -78,6 +69,13 @@ static void condition_save(const void *ip, const struct xt_entry_match *match)
printf("%s --condition \"%s\" ", info->invert ? " !" : "", info->name);
}
static void condition_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m condition");
condition_save(ip, match);
}
static struct xtables_match condition_mt_reg = {
.name = "condition",
.revision = 1,

View File

@@ -1,3 +1,4 @@
.PP
This matches if a specific condition variable is (un)set.
.TP
[\fB!\fP] \fB\-\-condition\fP \fIname\fP

View File

@@ -62,15 +62,6 @@ static void dhcpmac_mt_check(unsigned int flags)
"--mac parameter required");
}
static void dhcpmac_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
const struct dhcpmac_info *info = (void *)match->data;
printf(" dhcpmac %s" DH_MAC_FMT "/%u ",
info->invert ? "!" : "", DH_MAC_HEX(info->addr), info->mask);
}
static void dhcpmac_mt_save(const void *ip,
const struct xt_entry_match *match)
{
@@ -82,6 +73,13 @@ static void dhcpmac_mt_save(const void *ip,
DH_MAC_HEX(info->addr), info->mask);
}
static void dhcpmac_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
printf(" -m dhcpmac");
dhcpmac_mt_save(ip, match);
}
static struct xtables_match dhcpmac_mt_reg = {
.version = XTABLES_VERSION,
.name = "dhcpmac",

View File

@@ -83,15 +83,6 @@ static void fuzzy_mt_check(unsigned int flags)
{
}
static void fuzzy_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_fuzzy_mtinfo *info = (const void *)match->data;
printf(" fuzzy: lower limit = %u pps - upper limit = %u pps ",
info->minimum_rate, info->maximum_rate);
}
static void fuzzy_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_fuzzy_mtinfo *info = (const void *)match->data;
@@ -100,6 +91,13 @@ static void fuzzy_mt_save(const void *ip, const struct xt_entry_match *match)
printf(" --upper-limit %u ", info->maximum_rate);
}
static void fuzzy_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m fuzzy");
fuzzy_mt_save(ip, match);
}
static struct xtables_match fuzzy_mt_reg = {
.name = "fuzzy",
.revision = 1,

View File

@@ -1,3 +1,4 @@
.PP
This module matches a rate limit based on a fuzzy logic controller (FLC).
.TP
\fB\-\-lower\-limit\fP \fInumber\fP

View File

@@ -251,31 +251,6 @@ geoip_final_check(unsigned int flags)
"geoip: missing arguments");
}
static void
geoip_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_geoip_match_info *info = (void*)match->data;
u_int8_t i;
if (info->flags & XT_GEOIP_SRC)
printf(" Source ");
else
printf(" Destination ");
if (info->count > 1)
printf("countries: ");
else
printf("country: ");
if (info->flags & XT_GEOIP_INV)
printf("! ");
for (i = 0; i < info->count; i++)
printf("%s%c%c", i ? "," : "", COUNTRY(info->cc[i]));
printf(" ");
}
static void
geoip_save(const void *ip, const struct xt_entry_match *match)
{
@@ -295,6 +270,13 @@ geoip_save(const void *ip, const struct xt_entry_match *match)
printf(" ");
}
static void
geoip_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
printf(" -m geoip");
geoip_save(ip, match);
}
static struct xtables_match geoip_match[] = {
{
.family = NFPROTO_IPV6,

View File

@@ -1,3 +1,4 @@
.PP
Match a packet by its source or destination country.
.TP
[\fB!\fP] \fB\-\-src\-cc\fP, \fB\-\-source\-country\fP \fIcountry\fP[\fB,\fP\fIcountry\fP\fB...\fP]
@@ -15,8 +16,8 @@ with the source package, and which should be available in compiled packages in
/usr/lib(exec)/xtables-addons/. The first command retrieves CSV files from
MaxMind, while the other two build packed bisectable range files:
.PP
mkdir -p /usr/share/xt_geoip; cd /tmp; $path/to/xt_geoip_dl;
mkdir \-p /usr/share/xt_geoip; cd /tmp; $path/to/xt_geoip_dl;
.PP
$path/to/xt_geoip_build -D /usr/share/xt_geoip GeoIP*.csv;
$path/to/xt_geoip_build \-D /usr/share/xt_geoip GeoIP*.csv;
.PP
The shared library is hardcoded to look in these paths, so use them.

View File

@@ -57,17 +57,6 @@ static void gradm_mt_check(unsigned int flags)
{
}
static void gradm_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_gradm_mtinfo *info = (const void *)match->data;
if (info->invflags)
printf("gradm: disabled");
else
printf("gradm: enabled");
}
static void gradm_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_gradm_mtinfo *info = (const void *)match->data;
@@ -78,6 +67,13 @@ static void gradm_mt_save(const void *ip, const struct xt_entry_match *match)
printf(" --enabled ");
}
static void gradm_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m gradm");
gradm_mt_save(ip, match);
}
static struct xtables_match gradm_mt_reg = {
.family = NFPROTO_UNSPEC,
.name = "gradm",

View File

@@ -1,3 +1,4 @@
.PP
This module matches packets based on grsecurity RBAC status.
.TP
[\fB!\fP] \fB\-\-enabled\fP

View File

@@ -175,33 +175,6 @@ static void iface_mt_check(unsigned int flags)
"iface: You must specify at least one option");
}
static void iface_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_iface_mtinfo *info = (const void *)match->data;
printf(" iface: ");
if (info->flags & XT_IFACE_DEV_IN)
printf("(in)");
else if (info->flags & XT_IFACE_DEV_OUT)
printf("(out)");
else
printf("%s", info->ifname);
printf(" [state:");
iface_print_opt(info, XT_IFACE_UP, "up");
iface_print_opt(info, XT_IFACE_BROADCAST, "broadcast");
iface_print_opt(info, XT_IFACE_LOOPBACK, "loopback");
iface_print_opt(info, XT_IFACE_POINTOPOINT, "pointopoint");
iface_print_opt(info, XT_IFACE_RUNNING, "running");
iface_print_opt(info, XT_IFACE_NOARP, "noarp");
iface_print_opt(info, XT_IFACE_PROMISC, "promisc");
iface_print_opt(info, XT_IFACE_MULTICAST, "multicast");
iface_print_opt(info, XT_IFACE_DYNAMIC, "dynamic");
iface_print_opt(info, XT_IFACE_LOWER_UP, "lower_up");
iface_print_opt(info, XT_IFACE_DORMANT, "dormant");
printf("] ");
}
static void iface_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_iface_mtinfo *info = (const void *)match->data;
@@ -226,6 +199,13 @@ static void iface_mt_save(const void *ip, const struct xt_entry_match *match)
printf(" ");
}
static void iface_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m iface");
iface_mt_save(ip, match);
}
static struct xtables_match iface_mt_reg = {
.version = XTABLES_VERSION,
.name = "iface",

View File

@@ -1,3 +1,4 @@
.PP
Allows you to check interface states. First, an interface needs to be selected
for comparison. Exactly one option of the following three must be specified:
.TP

View File

@@ -217,7 +217,7 @@ ipp2p_mt_print1(const void *entry, const struct xt_entry_match *match,
static void ipp2p_mt_print(const void *entry,
const struct xt_entry_match *match, int numeric)
{
printf(" ipp2p ");
printf(" -m ipp2p ");
ipp2p_mt_print1(entry, match, true);
}

View File

@@ -1,3 +1,4 @@
.PP
This module matches certain packets in P2P flows. It is not
designed to match all packets belonging to a P2P connection \(em
use IPP2P together with CONNMARK for this purpose.

View File

@@ -133,17 +133,6 @@ static void ipv4options_print_flags(const struct xt_ipv4options_mtinfo1 *info,
}
}
static void ipv4options_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
const struct xt_ipv4options_mtinfo1 *info = (void *)match->data;
printf(" ipv4options %s ",
(info->flags & XT_V4OPTS_ANY) ? "any-of" : "all-of");
ipv4options_print_flags(info, numeric);
printf(" ");
}
static void ipv4options_mt_save(const void *ip,
const struct xt_entry_match *match)
{
@@ -158,6 +147,13 @@ static void ipv4options_mt_save(const void *ip,
printf(" ");
}
static void ipv4options_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
printf(" -m ipv4options");
ipv4options_mt_save(ip, match);
}
static struct xtables_match ipv4options_mt_reg = {
.version = XTABLES_VERSION,
.name = "ipv4options",

View File

@@ -1,3 +1,4 @@
.PP
The "ipv4options" module allows to match against a set of IPv4 header options.
.TP
\fB\-\-flags\fP [\fB!\fP]\fIsymbol\fP[\fB,\fP[\fB!\fP]\fIsymbol...\fP]

View File

@@ -107,29 +107,6 @@ static void length_mt_check(unsigned int flags)
"--layer3. Consider specifying it explicitly.\n");
}
static void length_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_length_mtinfo2 *info = (const void *)match->data;
if (info->flags & XT_LENGTH_LAYER3)
printf(" layer3 ");
else if (info->flags & XT_LENGTH_LAYER4)
printf(" layer4 ");
else if (info->flags & XT_LENGTH_LAYER5)
printf(" layer5 ");
else if (info->flags & XT_LENGTH_LAYER7)
printf(" layer7 ");
printf(" length ");
if (info->flags & XT_LENGTH_INVERT)
printf("! ");
if (info->min == info->max)
printf("%u ", (unsigned int)info->min);
else
printf("%u-%u ", (unsigned int)info->min,
(unsigned int)info->max);
}
static void length_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_length_mtinfo2 *info = (const void *)match->data;
@@ -152,6 +129,13 @@ static void length_mt_save(const void *ip, const struct xt_entry_match *match)
(unsigned int)info->max);
}
static void length_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" -m length2");
length_mt_save(ip, match);
}
static struct xtables_match length2_mt_reg = {
.version = XTABLES_VERSION,
.name = "length2",

View File

@@ -1,3 +1,4 @@
.PP
This module matches the length of a packet against a specific value or range of
values.
.TP

View File

@@ -64,30 +64,6 @@ static void lscan_mt_check(unsigned int flags)
{
}
static void lscan_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
const struct xt_lscan_mtinfo *info = (const void *)(match->data);
const char *s = "";
printf(" lscan ");
if (info->match_stealth) {
printf("STEALTH");
s = ",";
}
if (info->match_syn) {
printf("%sSYNSCAN", s);
s = ",";
}
if (info->match_cn) {
printf("%sCNSCAN", s);
s = ",";
}
if (info->match_gr)
printf("%sGRSCAN", s);
printf(" ");
}
static void lscan_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_lscan_mtinfo *info = (const void *)(match->data);
@@ -102,6 +78,13 @@ static void lscan_mt_save(const void *ip, const struct xt_entry_match *match)
printf(" --grscan ");
}
static void lscan_mt_print(const void *ip,
const struct xt_entry_match *match, int numeric)
{
printf(" -m lscan");
lscan_mt_save(ip, match);
}
static struct xtables_match lscan_mt_reg = {
.version = XTABLES_VERSION,
.name = "lscan",

View File

@@ -1,4 +1,5 @@
Detects simple low-level scan attemps based upon the packet's contents.
.PP
Detects simple low-level scan attempts based upon the packet's contents.
(This is
different from other implementations, which also try to match the rate of new
connections.) Note that an attempt is only discovered after it has been carried

View File

@@ -117,18 +117,6 @@ static int psd_mt_parse(int c, char **argv, int invert, unsigned int *flags,
/* Final check; nothing. */
static void psd_mt_final_check(unsigned int flags) {}
/* Prints out the targinfo. */
static void psd_mt_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_psd_info *psdinfo = (const struct xt_psd_info *)match->data;
printf(" psd ");
printf("weight-threshold: %u ", psdinfo->weight_threshold);
printf("delay-threshold: %u ", psdinfo->delay_threshold);
printf("lo-ports-weight: %u ", psdinfo->lo_ports_weight);
printf("hi-ports-weight: %u ", psdinfo->hi_ports_weight);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void psd_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_psd_info *psdinfo = (const struct xt_psd_info *)match->data;
@@ -138,6 +126,12 @@ static void psd_mt_save(const void *ip, const struct xt_entry_match *match)
printf("--psd-hi-ports-weight %u ", psdinfo->hi_ports_weight);
}
static void psd_mt_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
printf(" -m psd");
psd_mt_save(ip, match);
}
static struct xtables_match psd_mt_reg = {
.name = "psd",
.version = XTABLES_VERSION,

View File

@@ -1,3 +1,4 @@
.PP
Attempt to detect TCP and UDP port scans. This match was derived from
Solar Designer's scanlogd.
.TP

View File

@@ -98,8 +98,6 @@ quota_mt2_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_quota_mtinfo2 *q = (void *)match->data;
if (q->flags & XT_QUOTA_INVERT)
printf(" !");
if (q->flags & XT_QUOTA_GROW)
printf(" --grow ");
if (q->flags & XT_QUOTA_NO_CHANGE)
@@ -108,29 +106,16 @@ quota_mt2_save(const void *ip, const struct xt_entry_match *match)
printf(" --packets ");
if (*q->name != '\0')
printf(" --name %s ", q->name);
if (q->flags & XT_QUOTA_INVERT)
printf(" !");
printf(" --quota %llu ", (unsigned long long)q->quota);
}
static void quota_mt2_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_quota_mtinfo2 *q = (const void *)match->data;
if (q->flags & XT_QUOTA_INVERT)
printf(" !");
if (q->flags & XT_QUOTA_GROW)
printf(" counter");
else
printf(" quota");
if (*q->name != '\0')
printf(" %s:", q->name);
printf(" %llu ", (unsigned long long)q->quota);
if (q->flags & XT_QUOTA_PACKET)
printf("packets ");
else
printf("bytes ");
if (q->flags & XT_QUOTA_NO_CHANGE)
printf("(no-change mode) ");
printf(" -m quota");
quota_mt2_save(ip, match);
}
static struct xtables_match quota_mt2_reg = {

View File

@@ -1,3 +1,4 @@
.PP
The "quota2" implements a named counter which can be increased or decreased
on a per-match basis. Available modes are packet counting or byte counting.
The value of the counter can be read and reset through procfs, thereby making

View File

@@ -15,10 +15,10 @@ modprobe xt_pknock
.PP
Example 1 (TCP mode, manual closing of opened port not possible):
.IP
iptables -P INPUT DROP
iptables \-P INPUT DROP
.IP
iptables -A INPUT -p tcp -m pknock --knockports 4002,4001,4004 --strict
--name SSH --time 10 --autoclose 60 --dport 22 -j ACCEPT
iptables \-A INPUT \-p tcp \-m pknock \-\-knockports 4002,4001,4004 \-\-strict
\-\-name SSH \-\-time 10 \-\-autoclose 60 \-\-dport 22 \-j ACCEPT
.PP
The rule will allow tcp port 22 for the attempting IP address after the successful reception of TCP SYN packets
to ports 4002, 4001 and 4004, in this order (a.k.a. port-knocking).
@@ -33,10 +33,10 @@ Example 2 (UDP mode \(em non-replayable and non-spoofable, manual closing
of opened port possible, secure, also called "SPA" = Secure Port
Authorization):
.IP
iptables -A INPUT -p udp -m pknock --knockports 4000 --name FTP
--opensecret foo --closesecret bar --autoclose 240 -j DROP
iptables \-A INPUT \-p udp \-m pknock \-\-knockports 4000 \-\-name FTP
\-\-opensecret foo \-\-closesecret bar \-\-autoclose 240 \-j DROP
.IP
iptables -A INPUT -p tcp -m pknock --checkip --name FTP --dport 21 -j ACCEPT
iptables \-A INPUT \-p tcp \-m pknock \-\-checkip \-\-name FTP \-\-dport 21 \-j ACCEPT
.PP
The first rule will create an "ALLOWED" record in /proc/net/xt_pknock/FTP after
the successful reception of an UDP packet to port 4000. The packet payload must be

View File

@@ -190,8 +190,7 @@ status_itoa(enum status status)
static void *
pknock_seq_start(struct seq_file *s, loff_t *pos)
{
const struct proc_dir_entry *pde = s->private;
const struct xt_pknock_rule *rule = pde->data;
const struct xt_pknock_rule *rule = s->private;
spin_lock_bh(&list_lock);
@@ -210,8 +209,7 @@ pknock_seq_start(struct seq_file *s, loff_t *pos)
static void *
pknock_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
const struct proc_dir_entry *pde = s->private;
const struct xt_pknock_rule *rule = pde->data;
const struct xt_pknock_rule *rule = s->private;
++*pos;
if (*pos >= peer_hashsize)
@@ -243,8 +241,7 @@ pknock_seq_show(struct seq_file *s, void *v)
unsigned long time;
const struct list_head *peer_head = v;
const struct proc_dir_entry *pde = s->private;
const struct xt_pknock_rule *rule = pde->data;
const struct xt_pknock_rule *rule = s->private;
list_for_each_safe(pos, n, peer_head) {
peer = list_entry(pos, struct peer, head);
@@ -295,7 +292,7 @@ pknock_proc_open(struct inode *inode, struct file *file)
int ret = seq_open(file, &pknock_seq_ops);
if (ret == 0) {
struct seq_file *sf = file->private_data;
sf->private = PDE(inode);
sf->private = PDE_DATA(inode);
}
return ret;
}
@@ -478,13 +475,11 @@ add_rule(struct xt_pknock_mtinfo *info)
rule->timer.function = peer_gc;
rule->timer.data = (unsigned long)rule;
rule->status_proc = create_proc_entry(info->rule_name, 0, pde);
rule->status_proc = proc_create_data(info->rule_name, 0, pde,
&pknock_proc_ops, rule);
if (rule->status_proc == NULL)
goto out;
rule->status_proc->proc_fops = &pknock_proc_ops;
rule->status_proc->data = rule;
list_add(&rule->head, &rule_hashtable[hash]);
pr_debug("(A) rule_name: %s - created.\n", rule->rule_name);
return true;

View File

@@ -26,6 +26,8 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <linux/seq_file.h>
#include <linux/uidgid.h>
#include <linux/version.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
@@ -112,13 +114,9 @@ static DEFINE_SPINLOCK(dnetmap_lock);
static DEFINE_MUTEX(dnetmap_mutex);
#ifdef CONFIG_PROC_FS
static const struct file_operations dnetmap_tg_fops;
static const struct file_operations dnetmap_tg_fops, dnetmap_stat_proc_fops;
#endif
static int dnetmap_stat_proc_read(char __user *buffer, char **start,
off_t offset, int length, int *eof,
void *data);
static inline unsigned int dnetmap_entry_hash(const __be32 addr)
{
return ntohl(addr) & (hash_size - 1);
@@ -328,21 +326,20 @@ static int dnetmap_tg_check(const struct xt_tgchk_param *par)
ret = -ENOMEM;
goto out;
}
pde_data->uid = proc_uid;
pde_data->gid = proc_gid;
proc_set_user(pde_data, make_kuid(&init_user_ns, proc_uid),
make_kgid(&init_user_ns, proc_gid));
/* statistics */
pde_stat = create_proc_entry(p->proc_str_stat, proc_perms,
dnetmap_net->xt_dnetmap);
pde_stat = proc_create_data(p->proc_str_stat, proc_perms,
dnetmap_net->xt_dnetmap,
&dnetmap_stat_proc_fops, p);
if (pde_stat == NULL) {
kfree(p);
ret = -ENOMEM;
goto out;
}
pde_stat->data = p;
pde_stat->read_proc = dnetmap_stat_proc_read;
pde_stat->uid = proc_uid;
pde_stat->gid = proc_gid;
proc_set_user(pde_stat, make_kuid(&init_user_ns, proc_uid),
make_kgid(&init_user_ns, proc_gid));
#endif
spin_lock_bh(&dnetmap_lock);
@@ -593,22 +590,20 @@ static const struct seq_operations dnetmap_seq_ops = {
static int dnetmap_seq_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *pde = PDE(inode);
struct dnetmap_iter_state *st;
st = __seq_open_private(file, &dnetmap_seq_ops, sizeof(*st));
if (st == NULL)
return -ENOMEM;
st->p = pde->data;
st->p = PDE_DATA(inode);
return 0;
}
static ssize_t
dnetmap_tg_proc_write(struct file *file, const char __user *input,size_t size, loff_t *loff)
{
const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
struct dnetmap_prefix *p = pde->data;
struct dnetmap_prefix *p = PDE_DATA(file_inode(file));
struct dnetmap_entry *e;
char buf[sizeof("+192.168.100.100:200.200.200.200")];
const char *c = buf;
@@ -783,11 +778,9 @@ static const struct file_operations dnetmap_tg_fops = {
};
/* for statistics */
static int dnetmap_stat_proc_read(char __user *buffer, char **start,
off_t offset, int length, int *eof,
void *data)
static int dnetmap_stat_proc_show(struct seq_file *m, void *data)
{
const struct dnetmap_prefix *p = data;
const struct dnetmap_prefix *p = m->private;
struct dnetmap_entry *e;
unsigned int used, used_static, all;
long int ttl, sum_ttl;
@@ -813,16 +806,25 @@ static int dnetmap_stat_proc_read(char __user *buffer, char **start,
}
sum_ttl = used > 0 ? sum_ttl / (used * HZ) : 0;
sprintf(buffer, "%u %u %u %ld %s\n", used, used_static, all, sum_ttl,(p->flags & XT_DNETMAP_PERSISTENT ? "persistent" : ""));
if (length >= strlen(buffer))
*eof = true;
seq_printf(m, "%u %u %u %ld %s\n", used, used_static, all, sum_ttl,(p->flags & XT_DNETMAP_PERSISTENT ? "persistent" : ""));
spin_unlock_bh(&dnetmap_lock);
return strlen(buffer);
return 0;
}
static int dnetmap_stat_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, dnetmap_stat_proc_show, PDE_DATA(inode));
}
static const struct file_operations dnetmap_stat_proc_fops = {
.open = dnetmap_stat_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __net_init dnetmap_proc_net_init(struct net *net)
{
struct dnetmap_net *dnetmap_net = dnetmap_pernet(net);

View File

@@ -109,7 +109,7 @@ static void rawnat4_update_l4(struct sk_buff *skb, __be32 oldip, __be32 newip)
static unsigned int rawnat4_writable_part(const struct iphdr *iph)
{
unsigned int wlen = sizeof(*iph);
unsigned int wlen = iph->ihl * 4;
switch (iph->protocol) {
case IPPROTO_TCP:

View File

@@ -79,7 +79,7 @@ static bool xttarpit_tarpit(struct tcphdr *tcph, const struct tcphdr *oth)
#if 0
/* Rate-limit replies to !SYN,ACKs */
if (!oth->syn && oth->ack)
if (!xrlim_allow(rt_dst(ort), HZ))
if (!xrlim_allow(&ort->dst, HZ))
return false;
#endif

View File

@@ -52,6 +52,7 @@ struct condition_variable {
struct proc_dir_entry *status_proc;
unsigned int refcount;
bool enabled;
char name[sizeof(((struct xt_condition_mtinfo *)NULL)->name)];
};
/* proc_lock is a user context only semaphore used for write access */
@@ -61,22 +62,23 @@ static DEFINE_MUTEX(proc_lock);
static LIST_HEAD(conditions_list);
static struct proc_dir_entry *proc_net_condition;
static int condition_proc_read(char __user *buffer, char **start, off_t offset,
int length, int *eof, void *data)
static int condition_proc_show(struct seq_file *m, void *data)
{
const struct condition_variable *var = data;
const struct condition_variable *var = m->private;
buffer[0] = var->enabled ? '1' : '0';
buffer[1] = '\n';
if (length >= 2)
*eof = true;
return 2;
return seq_printf(m, var->enabled ? "1\n" : "0\n");
}
static int condition_proc_write(struct file *file, const char __user *buffer,
unsigned long length, void *data)
static int condition_proc_open(struct inode *inode, struct file *file)
{
struct condition_variable *var = data;
return single_open(file, condition_proc_show, PDE_DATA(inode));
}
static ssize_t
condition_proc_write(struct file *file, const char __user *buffer,
size_t length, loff_t *loff)
{
struct condition_variable *var = PDE_DATA(file_inode(file));
char newval;
if (length > 0) {
@@ -95,6 +97,14 @@ static int condition_proc_write(struct file *file, const char __user *buffer,
return length;
}
static const struct file_operations condition_proc_fops = {
.open = condition_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.write = condition_proc_write,
.release = single_release,
};
static bool
condition_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
@@ -124,7 +134,7 @@ static int condition_mt_check(const struct xt_mtchk_param *par)
*/
mutex_lock(&proc_lock);
list_for_each_entry(var, &conditions_list, list) {
if (strcmp(info->name, var->status_proc->name) == 0) {
if (strcmp(info->name, var->name) == 0) {
var->refcount++;
mutex_unlock(&proc_lock);
info->condvar = var;
@@ -139,24 +149,23 @@ static int condition_mt_check(const struct xt_mtchk_param *par)
return -ENOMEM;
}
memcpy(var->name, info->name, sizeof(info->name));
/* Create the condition variable's proc file entry. */
var->status_proc = create_proc_entry(info->name, condition_list_perms,
proc_net_condition);
var->status_proc = proc_create_data(info->name, condition_list_perms,
proc_net_condition, &condition_proc_fops, var);
if (var->status_proc == NULL) {
kfree(var);
mutex_unlock(&proc_lock);
return -ENOMEM;
}
proc_set_user(var->status_proc,
make_kuid(&init_user_ns, condition_uid_perms),
make_kgid(&init_user_ns, condition_gid_perms));
var->refcount = 1;
var->enabled = false;
var->status_proc->data = var;
wmb();
var->status_proc->read_proc = condition_proc_read;
var->status_proc->write_proc = condition_proc_write;
list_add(&var->list, &conditions_list);
var->status_proc->uid = condition_uid_perms;
var->status_proc->gid = condition_gid_perms;
mutex_unlock(&proc_lock);
info->condvar = var;
return 0;
@@ -170,7 +179,7 @@ static void condition_mt_destroy(const struct xt_mtdtor_param *par)
mutex_lock(&proc_lock);
if (--var->refcount == 0) {
list_del(&var->list);
remove_proc_entry(var->status_proc->name, proc_net_condition);
proc_remove(var->status_proc);
mutex_unlock(&proc_lock);
kfree(var);
return;

View File

@@ -83,10 +83,18 @@ geoip_add_node(const struct geoip_country_user __user *umem_ptr,
p->count = umem.count;
p->cc = umem.cc;
size = p->count * geoproto_size[proto];
subnet = vmalloc(size);
if (subnet == NULL) {
ret = -ENOMEM;
goto free_p;
if (size == 0) {
/*
* Believe it or not, vmalloc prints a warning to dmesg for
* zero-sized allocations :-/
*/
subnet = NULL;
} else {
subnet = vmalloc(size);
if (subnet == NULL) {
ret = -ENOMEM;
goto free_p;
}
}
if (copy_from_user(subnet,
(const void __user *)(unsigned long)umem.subnets, size) != 0) {

View File

@@ -14,8 +14,10 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/uidgid.h>
#include <linux/version.h>
#include <asm/atomic.h>
@@ -46,22 +48,27 @@ module_param_named(perms, quota_list_perms, uint, S_IRUGO | S_IWUSR);
module_param_named(uid, quota_list_uid, uint, S_IRUGO | S_IWUSR);
module_param_named(gid, quota_list_gid, uint, S_IRUGO | S_IWUSR);
static int quota_proc_read(char *page, char **start, off_t offset,
int count, int *eof, void *data)
static int quota_proc_show(struct seq_file *m, void *data)
{
struct xt_quota_counter *e = data;
struct xt_quota_counter *e = m->private;
int ret;
spin_lock_bh(&e->lock);
ret = snprintf(page, PAGE_SIZE, "%llu\n", e->quota);
ret = seq_printf(m, "%llu\n", e->quota);
spin_unlock_bh(&e->lock);
return ret;
}
static int quota_proc_write(struct file *file, const char __user *input,
unsigned long size, void *data)
static int quota_proc_open(struct inode *inode, struct file *file)
{
struct xt_quota_counter *e = data;
return single_open(file, quota_proc_show, PDE_DATA(inode));
}
static ssize_t
quota_proc_write(struct file *file, const char __user *input,
size_t size, loff_t *loff)
{
struct xt_quota_counter *e = PDE_DATA(file_inode(file));
char buf[sizeof("18446744073709551616")];
if (size > sizeof(buf))
@@ -76,6 +83,14 @@ static int quota_proc_write(struct file *file, const char __user *input,
return size;
}
static const struct file_operations quota_proc_fops = {
.open = quota_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.write = quota_proc_write,
.release = single_release,
};
static struct xt_quota_counter *
q2_new_counter(const struct xt_quota_mtinfo2 *q, bool anon)
{
@@ -123,16 +138,14 @@ q2_get_counter(const struct xt_quota_mtinfo2 *q)
if (e == NULL)
goto out;
p = e->procfs_entry = create_proc_entry(e->name, quota_list_perms,
proc_xt_quota);
p = proc_create_data(e->name, quota_list_perms, proc_xt_quota,
&quota_proc_fops, e);
if (p == NULL || IS_ERR(p))
goto out;
p->data = e;
p->read_proc = quota_proc_read;
p->write_proc = quota_proc_write;
p->uid = quota_list_uid;
p->gid = quota_list_gid;
e->procfs_entry = p;
proc_set_user(p, make_kuid(&init_user_ns, quota_list_uid),
make_kgid(&init_user_ns, quota_list_gid));
list_add_tail(&e->list, &counter_list);
spin_unlock_bh(&counter_list_lock);
return e;

View File

@@ -29,7 +29,7 @@ Specify a target directory into which the files are to be put.
.PP
Shell commands to build the databases and put them to where they are expected:
.PP
xt_geoip_build -D /usr/share/xt_geoip
xt_geoip_build \-D /usr/share/xt_geoip
.SH See also
.PP
xt_geoip_dl(1)

View File

@@ -1,6 +1,6 @@
#!/bin/sh
rm -f GeoIPv6.csv{,.gz} GeoIPCountryCSV.zip GeoIPCountryWhois.csv;
rm -f GeoIPv6.csv GeoIPv6.csv.gz GeoIPCountryCSV.zip GeoIPCountryWhois.csv;
wget \
http://geolite.maxmind.com/download/geoip/database/GeoIPv6.csv.gz \
http://geolite.maxmind.com/download/geoip/database/GeoIPCountryCSV.zip;

View File

@@ -1,4 +1,4 @@
.TH xtables-addons 8 "Continuous Snow Edition" "" "v2.2 (2013-03-31)"
.TH xtables-addons 8 "African Heat Edition" "" "v2.3 (2013-06-18)"
.SH Name
Xtables-addons \(em additional extensions for iptables, ip6tables, etc.
.SH Targets