[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 7d55f9c..99c0a0f 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -103,3 +103,261 @@
This option enables support for a netlink-based userspace interface
endmenu
+
+config NETFILTER_XTABLES
+ tristate "Netfilter Xtables support (required for ip_tables)"
+ help
+ This is required if you intend to use any of ip_tables,
+ ip6_tables or arp_tables.
+
+# alphabetically ordered list of targets
+
+config NETFILTER_XT_TARGET_CLASSIFY
+ tristate '"CLASSIFY" target support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `CLASSIFY' target, which enables the user to set
+ the priority of a packet. Some qdiscs can use this value for
+ classification, among these are:
+
+ atm, cbq, dsmark, pfifo_fast, htb, prio
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_TARGET_CONNMARK
+ tristate '"CONNMARK" target support'
+ depends on NETFILTER_XTABLES
+ depends on IP_NF_MANGLE || IP6_NF_MANGLE
+ depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || (NF_CONNTRACK_MARK && NF_CONNTRACK_IPV4)
+ help
+ This option adds a `CONNMARK' target, which allows one to manipulate
+ the connection mark value. Similar to the MARK target, but
+ affects the connection mark value rather than the packet mark value.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. The module will be called
+ ipt_CONNMARK.o. If unsure, say `N'.
+
+config NETFILTER_XT_TARGET_MARK
+ tristate '"MARK" target support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `MARK' target, which allows you to create rules
+ in the `mangle' table which alter the netfilter mark (nfmark) field
+ associated with the packet prior to routing. This can change
+ the routing method (see `Use netfilter MARK value as routing
+ key') and can also be used by other subsystems to change their
+ behavior.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_TARGET_NFQUEUE
+ tristate '"NFQUEUE" target Support'
+ depends on NETFILTER_XTABLES
+ help
+ This Target replaced the old obsolete QUEUE target.
+
+ As opposed to QUEUE, it supports 65535 different queues,
+ not just one.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_TARGET_NOTRACK
+ tristate '"NOTRACK" target support'
+ depends on NETFILTER_XTABLES
+ depends on IP_NF_RAW || IP6_NF_RAW
+ depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ help
+ The NOTRACK target allows a select rule to specify
+ which packets *not* to enter the conntrack/NAT
+ subsystem with all the consequences (no ICMP error tracking,
+ no protocol helpers for the selected packets).
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_COMMENT
+ tristate '"comment" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `comment' dummy-match, which allows you to put
+ comments in your iptables ruleset.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_CONNBYTES
+ tristate '"connbytes" per-connection counter match support'
+ depends on NETFILTER_XTABLES
+ depends on (IP_NF_CONNTRACK && IP_NF_CT_ACCT) || NF_CT_ACCT
+ help
+ This option adds a `connbytes' match, which allows you to match the
+ number of bytes and/or packets for each direction within a connection.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_CONNMARK
+ tristate '"connmark" connection mark match support'
+ depends on NETFILTER_XTABLES
+ depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || NF_CONNTRACK_MARK
+ help
+ This option adds a `connmark' match, which allows you to match the
+ connection mark value previously set for the session by `CONNMARK'.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. The module will be called
+ ipt_connmark.o. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_CONNTRACK
+ tristate '"conntrack" connection tracking match support'
+ depends on NETFILTER_XTABLES
+ depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ help
+ This is a general conntrack match module, a superset of the state match.
+
+ It allows matching on additional conntrack information, which is
+ useful in complex configurations, such as NAT gateways with multiple
+ internet links or tunnels.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_DCCP
+ tristate '"DCCP" protocol match support'
+ depends on NETFILTER_XTABLES
+ help
+ With this option enabled, you will be able to use the iptables
+ `dccp' match in order to match on DCCP source/destination ports
+ and DCCP flags.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_HELPER
+ tristate '"helper" match support'
+ depends on NETFILTER_XTABLES
+ depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ help
+ Helper matching allows you to match packets in dynamic connections
+ tracked by a conntrack-helper, ie. ip_conntrack_ftp
+
+ To compile it as a module, choose M here. If unsure, say Y.
+
+config NETFILTER_XT_MATCH_LENGTH
+ tristate '"length" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This option allows you to match the length of a packet against a
+ specific value or range of values.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_LIMIT
+ tristate '"limit" match support'
+ depends on NETFILTER_XTABLES
+ help
+ limit matching allows you to control the rate at which a rule can be
+ matched: mainly useful in combination with the LOG target ("LOG
+ target support", below) and to avoid some Denial of Service attacks.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_MAC
+ tristate '"mac" address match support'
+ depends on NETFILTER_XTABLES
+ help
+ MAC matching allows you to match packets based on the source
+ Ethernet address of the packet.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_MARK
+ tristate '"mark" match support'
+ depends on NETFILTER_XTABLES
+ help
+ Netfilter mark matching allows you to match packets based on the
+ `nfmark' value in the packet. This can be set by the MARK target
+ (see below).
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_PHYSDEV
+ tristate '"physdev" match support'
+ depends on NETFILTER_XTABLES && BRIDGE_NETFILTER
+ help
+ Physdev packet matching matches against the physical bridge ports
+ the IP packet arrived on or will leave by.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_PKTTYPE
+ tristate '"pkttype" packet type match support'
+ depends on NETFILTER_XTABLES
+ help
+ Packet type matching allows you to match a packet by
+ its "class", eg. BROADCAST, MULTICAST, ...
+
+ Typical usage:
+ iptables -A INPUT -m pkttype --pkt-type broadcast -j LOG
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_REALM
+ tristate '"realm" match support'
+ depends on NETFILTER_XTABLES
+ select NET_CLS_ROUTE
+ help
+ This option adds a `realm' match, which allows you to use the realm
+ key from the routing subsystem inside iptables.
+
+ This match pretty much resembles the CONFIG_NET_CLS_ROUTE4 option
+ in tc world.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_SCTP
+ tristate '"sctp" protocol match support'
+ depends on NETFILTER_XTABLES
+ help
+ With this option enabled, you will be able to use the
+ `sctp' match in order to match on SCTP source/destination ports
+ and SCTP chunk types.
+
+ If you want to compile it as a module, say M here and read
+ <file:Documentation/modules.txt>. If unsure, say `N'.
+
+config NETFILTER_XT_MATCH_STATE
+ tristate '"state" match support'
+ depends on NETFILTER_XTABLES
+ depends on IP_NF_CONNTRACK || NF_CONNTRACK
+ help
+ Connection state matching allows you to match packets based on their
+ relationship to a tracked connection (ie. previous packets). This
+ is a powerful tool for packet classification.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_STRING
+ tristate '"string" match support'
+ depends on NETFILTER_XTABLES
+ select TEXTSEARCH
+ select TEXTSEARCH_KMP
+ select TEXTSEARCH_BM
+ select TEXTSEARCH_FSM
+ help
+ This option adds a `string' match, which allows you to look for
+ pattern matchings in packets.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
+config NETFILTER_XT_MATCH_TCPMSS
+ tristate '"tcpmss" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `tcpmss' match, which allows you to examine the
+ MSS value of TCP SYN packets, which control the maximum packet size
+ for that connection.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index cb21831..746172e 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -1,4 +1,5 @@
netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o
+nf_conntrack-objs := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
obj-$(CONFIG_NETFILTER) = netfilter.o
@@ -6,13 +7,43 @@
obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o
-nf_conntrack-objs := nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_l3proto_generic.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o
-
+# connection tracking
obj-$(CONFIG_NF_CONNTRACK) += nf_conntrack.o
-obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
# SCTP protocol connection tracking
obj-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
# netlink interface for nf_conntrack
obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o
+
+# connection tracking helpers
+obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
+
+# generic X tables
+obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
+
+# targets
+obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIFY) += xt_CLASSIFY.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o
+
+# matches
+obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_CONNBYTES) += xt_connbytes.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_CONNMARK) += xt_connmark.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_CONNTRACK) += xt_conntrack.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_DCCP) += xt_dccp.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 3531d14..617599a 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -821,7 +821,7 @@
/* Some modules need us, but don't depend directly on any symbol.
They should call this. */
-void need_nf_conntrack(void)
+void need_conntrack(void)
{
}
@@ -841,7 +841,7 @@
EXPORT_SYMBOL(nf_ct_invert_tuplepr);
EXPORT_SYMBOL(nf_conntrack_alter_reply);
EXPORT_SYMBOL(nf_conntrack_destroyed);
-EXPORT_SYMBOL(need_nf_conntrack);
+EXPORT_SYMBOL(need_conntrack);
EXPORT_SYMBOL(nf_conntrack_helper_register);
EXPORT_SYMBOL(nf_conntrack_helper_unregister);
EXPORT_SYMBOL(nf_ct_iterate_cleanup);
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
new file mode 100644
index 0000000..d7817af
--- /dev/null
+++ b/net/netfilter/x_tables.c
@@ -0,0 +1,624 @@
+/*
+ * x_tables core - Backend for {ip,ip6,arp}_tables
+ *
+ * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org>
+ *
+ * Based on existing ip_tables code which is
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_arp.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("[ip,ip6,arp]_tables backend module");
+
+#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
+
+struct xt_af {
+ struct semaphore mutex;
+ struct list_head match;
+ struct list_head target;
+ struct list_head tables;
+};
+
+static struct xt_af *xt;
+
+#ifdef DEBUG_IP_FIREWALL_USER
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+enum {
+ TABLE,
+ TARGET,
+ MATCH,
+};
+
+/* Registration hooks for targets. */
+int
+xt_register_target(int af, struct xt_target *target)
+{
+ int ret;
+
+ ret = down_interruptible(&xt[af].mutex);
+ if (ret != 0)
+ return ret;
+ list_add(&target->list, &xt[af].target);
+ up(&xt[af].mutex);
+ return ret;
+}
+EXPORT_SYMBOL(xt_register_target);
+
+void
+xt_unregister_target(int af, struct xt_target *target)
+{
+ down(&xt[af].mutex);
+ LIST_DELETE(&xt[af].target, target);
+ up(&xt[af].mutex);
+}
+EXPORT_SYMBOL(xt_unregister_target);
+
+int
+xt_register_match(int af, struct xt_match *match)
+{
+ int ret;
+
+ ret = down_interruptible(&xt[af].mutex);
+ if (ret != 0)
+ return ret;
+
+ list_add(&match->list, &xt[af].match);
+ up(&xt[af].mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(xt_register_match);
+
+void
+xt_unregister_match(int af, struct xt_match *match)
+{
+ down(&xt[af].mutex);
+ LIST_DELETE(&xt[af].match, match);
+ up(&xt[af].mutex);
+}
+EXPORT_SYMBOL(xt_unregister_match);
+
+
+/*
+ * These are weird, but module loading must not be done with mutex
+ * held (since they will register), and we have to have a single
+ * function to use try_then_request_module().
+ */
+
+/* Find match, grabs ref. Returns ERR_PTR() on error. */
+struct xt_match *xt_find_match(int af, const char *name, u8 revision)
+{
+ struct xt_match *m;
+ int err = 0;
+
+ if (down_interruptible(&xt[af].mutex) != 0)
+ return ERR_PTR(-EINTR);
+
+ list_for_each_entry(m, &xt[af].match, list) {
+ if (strcmp(m->name, name) == 0) {
+ if (m->revision == revision) {
+ if (try_module_get(m->me)) {
+ up(&xt[af].mutex);
+ return m;
+ }
+ } else
+ err = -EPROTOTYPE; /* Found something. */
+ }
+ }
+ up(&xt[af].mutex);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(xt_find_match);
+
+/* Find target, grabs ref. Returns ERR_PTR() on error. */
+struct xt_target *xt_find_target(int af, const char *name, u8 revision)
+{
+ struct xt_target *t;
+ int err = 0;
+
+ if (down_interruptible(&xt[af].mutex) != 0)
+ return ERR_PTR(-EINTR);
+
+ list_for_each_entry(t, &xt[af].target, list) {
+ if (strcmp(t->name, name) == 0) {
+ if (t->revision == revision) {
+ if (try_module_get(t->me)) {
+ up(&xt[af].mutex);
+ return t;
+ }
+ } else
+ err = -EPROTOTYPE; /* Found something. */
+ }
+ }
+ up(&xt[af].mutex);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(xt_find_target);
+
+static const char *xt_prefix[NPROTO] = {
+ [AF_INET] = "ipt_%s",
+ [AF_INET6] = "ip6t_%s",
+ [NF_ARP] = "arpt_%s",
+};
+
+struct xt_target *xt_request_find_target(int af, const char *name, u8 revision)
+{
+ struct xt_target *target;
+
+ target = try_then_request_module(xt_find_target(af, name, revision),
+ xt_prefix[af], name);
+ if (IS_ERR(target) || !target)
+ return NULL;
+ return target;
+}
+EXPORT_SYMBOL_GPL(xt_request_find_target);
+
+static int match_revfn(int af, const char *name, u8 revision, int *bestp)
+{
+ struct xt_match *m;
+ int have_rev = 0;
+
+ list_for_each_entry(m, &xt[af].match, list) {
+ if (strcmp(m->name, name) == 0) {
+ if (m->revision > *bestp)
+ *bestp = m->revision;
+ if (m->revision == revision)
+ have_rev = 1;
+ }
+ }
+ return have_rev;
+}
+
+static int target_revfn(int af, const char *name, u8 revision, int *bestp)
+{
+ struct xt_target *t;
+ int have_rev = 0;
+
+ list_for_each_entry(t, &xt[af].target, list) {
+ if (strcmp(t->name, name) == 0) {
+ if (t->revision > *bestp)
+ *bestp = t->revision;
+ if (t->revision == revision)
+ have_rev = 1;
+ }
+ }
+ return have_rev;
+}
+
+/* Returns true or false (if no such extension at all) */
+int xt_find_revision(int af, const char *name, u8 revision, int target,
+ int *err)
+{
+ int have_rev, best = -1;
+
+ if (down_interruptible(&xt[af].mutex) != 0) {
+ *err = -EINTR;
+ return 1;
+ }
+ if (target == 1)
+ have_rev = target_revfn(af, name, revision, &best);
+ else
+ have_rev = match_revfn(af, name, revision, &best);
+ up(&xt[af].mutex);
+
+ /* Nothing at all? Return 0 to try loading module. */
+ if (best == -1) {
+ *err = -ENOENT;
+ return 0;
+ }
+
+ *err = best;
+ if (!have_rev)
+ *err = -EPROTONOSUPPORT;
+ return 1;
+}
+EXPORT_SYMBOL_GPL(xt_find_revision);
+
+struct xt_table_info *xt_alloc_table_info(unsigned int size)
+{
+ struct xt_table_info *newinfo;
+ int cpu;
+
+ /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
+ if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
+ return NULL;
+
+ newinfo = kzalloc(sizeof(struct xt_table_info), GFP_KERNEL);
+ if (!newinfo)
+ return NULL;
+
+ newinfo->size = size;
+
+ for_each_cpu(cpu) {
+ if (size <= PAGE_SIZE)
+ newinfo->entries[cpu] = kmalloc_node(size,
+ GFP_KERNEL,
+ cpu_to_node(cpu));
+ else
+ newinfo->entries[cpu] = vmalloc_node(size,
+ cpu_to_node(cpu));
+
+ if (newinfo->entries[cpu] == NULL) {
+ xt_free_table_info(newinfo);
+ return NULL;
+ }
+ }
+
+ return newinfo;
+}
+EXPORT_SYMBOL(xt_alloc_table_info);
+
+void xt_free_table_info(struct xt_table_info *info)
+{
+ int cpu;
+
+ for_each_cpu(cpu) {
+ if (info->size <= PAGE_SIZE)
+ kfree(info->entries[cpu]);
+ else
+ vfree(info->entries[cpu]);
+ }
+ kfree(info);
+}
+EXPORT_SYMBOL(xt_free_table_info);
+
+/* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
+struct xt_table *xt_find_table_lock(int af, const char *name)
+{
+ struct xt_table *t;
+
+ if (down_interruptible(&xt[af].mutex) != 0)
+ return ERR_PTR(-EINTR);
+
+ list_for_each_entry(t, &xt[af].tables, list)
+ if (strcmp(t->name, name) == 0 && try_module_get(t->me))
+ return t;
+ up(&xt[af].mutex);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(xt_find_table_lock);
+
+void xt_table_unlock(struct xt_table *table)
+{
+ up(&xt[table->af].mutex);
+}
+EXPORT_SYMBOL_GPL(xt_table_unlock);
+
+
+struct xt_table_info *
+xt_replace_table(struct xt_table *table,
+ unsigned int num_counters,
+ struct xt_table_info *newinfo,
+ int *error)
+{
+ struct xt_table_info *oldinfo, *private;
+
+ /* Do the substitution. */
+ write_lock_bh(&table->lock);
+ private = table->private;
+ /* Check inside lock: is the old number correct? */
+ if (num_counters != private->number) {
+ duprintf("num_counters != table->private->number (%u/%u)\n",
+ num_counters, private->number);
+ write_unlock_bh(&table->lock);
+ *error = -EAGAIN;
+ return NULL;
+ }
+ oldinfo = private;
+ table->private = newinfo;
+ newinfo->initial_entries = oldinfo->initial_entries;
+ write_unlock_bh(&table->lock);
+
+ return oldinfo;
+}
+EXPORT_SYMBOL_GPL(xt_replace_table);
+
+int xt_register_table(struct xt_table *table,
+ struct xt_table_info *bootstrap,
+ struct xt_table_info *newinfo)
+{
+ int ret;
+ struct xt_table_info *private;
+
+ ret = down_interruptible(&xt[table->af].mutex);
+ if (ret != 0)
+ return ret;
+
+ /* Don't autoload: we'd eat our tail... */
+ if (list_named_find(&xt[table->af].tables, table->name)) {
+ ret = -EEXIST;
+ goto unlock;
+ }
+
+ /* Simplifies replace_table code. */
+ table->private = bootstrap;
+ if (!xt_replace_table(table, 0, newinfo, &ret))
+ goto unlock;
+
+ private = table->private;
+ duprintf("table->private->number = %u\n", private->number);
+
+ /* save number of initial entries */
+ private->initial_entries = private->number;
+
+ rwlock_init(&table->lock);
+ list_prepend(&xt[table->af].tables, table);
+
+ ret = 0;
+ unlock:
+ up(&xt[table->af].mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(xt_register_table);
+
+void *xt_unregister_table(struct xt_table *table)
+{
+ struct xt_table_info *private;
+
+ down(&xt[table->af].mutex);
+ private = table->private;
+ LIST_DELETE(&xt[table->af].tables, table);
+ up(&xt[table->af].mutex);
+
+ return private;
+}
+EXPORT_SYMBOL_GPL(xt_unregister_table);
+
+#ifdef CONFIG_PROC_FS
+static char *xt_proto_prefix[NPROTO] = {
+ [AF_INET] = "ip",
+ [AF_INET6] = "ip6",
+ [NF_ARP] = "arp",
+};
+
+static struct list_head *xt_get_idx(struct list_head *list, struct seq_file *seq, loff_t pos)
+{
+ struct list_head *head = list->next;
+
+ if (!head || list_empty(list))
+ return NULL;
+
+ while (pos && (head = head->next)) {
+ if (head == list)
+ return NULL;
+ pos--;
+ }
+ return pos ? NULL : head;
+}
+
+static struct list_head *type2list(u_int16_t af, u_int16_t type)
+{
+ struct list_head *list;
+
+ switch (type) {
+ case TARGET:
+ list = &xt[af].target;
+ break;
+ case MATCH:
+ list = &xt[af].match;
+ break;
+ case TABLE:
+ list = &xt[af].tables;
+ break;
+ default:
+ list = NULL;
+ break;
+ }
+
+ return list;
+}
+
+static void *xt_tgt_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct proc_dir_entry *pde = (struct proc_dir_entry *) seq->private;
+ u_int16_t af = (unsigned long)pde->data & 0xffff;
+ u_int16_t type = (unsigned long)pde->data >> 16;
+ struct list_head *list;
+
+ if (af >= NPROTO)
+ return NULL;
+
+ list = type2list(af, type);
+ if (!list)
+ return NULL;
+
+ if (down_interruptible(&xt[af].mutex) != 0)
+ return NULL;
+
+ return xt_get_idx(list, seq, *pos);
+}
+
+static void *xt_tgt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct proc_dir_entry *pde = seq->private;
+ u_int16_t af = (unsigned long)pde->data & 0xffff;
+ u_int16_t type = (unsigned long)pde->data >> 16;
+ struct list_head *list;
+
+ if (af >= NPROTO)
+ return NULL;
+
+ list = type2list(af, type);
+ if (!list)
+ return NULL;
+
+ (*pos)++;
+ return xt_get_idx(list, seq, *pos);
+}
+
+static void xt_tgt_seq_stop(struct seq_file *seq, void *v)
+{
+ struct proc_dir_entry *pde = seq->private;
+ u_int16_t af = (unsigned long)pde->data & 0xffff;
+
+ up(&xt[af].mutex);
+}
+
+static int xt_name_seq_show(struct seq_file *seq, void *v)
+{
+ char *name = (char *)v + sizeof(struct list_head);
+
+ if (strlen(name))
+ return seq_printf(seq, "%s\n", name);
+ else
+ return 0;
+}
+
+static struct seq_operations xt_tgt_seq_ops = {
+ .start = xt_tgt_seq_start,
+ .next = xt_tgt_seq_next,
+ .stop = xt_tgt_seq_stop,
+ .show = xt_name_seq_show,
+};
+
+static int xt_tgt_open(struct inode *inode, struct file *file)
+{
+ int ret;
+
+ ret = seq_open(file, &xt_tgt_seq_ops);
+ if (!ret) {
+ struct seq_file *seq = file->private_data;
+ struct proc_dir_entry *pde = PDE(inode);
+
+ seq->private = pde;
+ }
+
+ return ret;
+}
+
+static struct file_operations xt_file_ops = {
+ .owner = THIS_MODULE,
+ .open = xt_tgt_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#define FORMAT_TABLES "_tables_names"
+#define FORMAT_MATCHES "_tables_matches"
+#define FORMAT_TARGETS "_tables_targets"
+
+#endif /* CONFIG_PROC_FS */
+
+int xt_proto_init(int af)
+{
+#ifdef CONFIG_PROC_FS
+ char buf[XT_FUNCTION_MAXNAMELEN];
+ struct proc_dir_entry *proc;
+#endif
+
+ if (af >= NPROTO)
+ return -EINVAL;
+
+
+#ifdef CONFIG_PROC_FS
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_TABLES, sizeof(buf));
+ proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
+ if (!proc)
+ goto out;
+ proc->data = (void *) ((unsigned long) af | (TABLE << 16));
+
+
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_MATCHES, sizeof(buf));
+ proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
+ if (!proc)
+ goto out_remove_tables;
+ proc->data = (void *) ((unsigned long) af | (MATCH << 16));
+
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_TARGETS, sizeof(buf));
+ proc = proc_net_fops_create(buf, 0440, &xt_file_ops);
+ if (!proc)
+ goto out_remove_matches;
+ proc->data = (void *) ((unsigned long) af | (TARGET << 16));
+#endif
+
+ return 0;
+
+#ifdef CONFIG_PROC_FS
+out_remove_matches:
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_MATCHES, sizeof(buf));
+ proc_net_remove(buf);
+
+out_remove_tables:
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_TABLES, sizeof(buf));
+ proc_net_remove(buf);
+out:
+ return -1;
+#endif
+}
+EXPORT_SYMBOL_GPL(xt_proto_init);
+
+void xt_proto_fini(int af)
+{
+#ifdef CONFIG_PROC_FS
+ char buf[XT_FUNCTION_MAXNAMELEN];
+
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_TABLES, sizeof(buf));
+ proc_net_remove(buf);
+
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_TARGETS, sizeof(buf));
+ proc_net_remove(buf);
+
+ strlcpy(buf, xt_proto_prefix[af], sizeof(buf));
+ strlcat(buf, FORMAT_MATCHES, sizeof(buf));
+ proc_net_remove(buf);
+#endif /*CONFIG_PROC_FS*/
+}
+EXPORT_SYMBOL_GPL(xt_proto_fini);
+
+
+static int __init xt_init(void)
+{
+ int i;
+
+ xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
+ if (!xt)
+ return -ENOMEM;
+
+ for (i = 0; i < NPROTO; i++) {
+ init_MUTEX(&xt[i].mutex);
+ INIT_LIST_HEAD(&xt[i].target);
+ INIT_LIST_HEAD(&xt[i].match);
+ INIT_LIST_HEAD(&xt[i].tables);
+ }
+ return 0;
+}
+
+static void __exit xt_fini(void)
+{
+ kfree(xt);
+}
+
+module_init(xt_init);
+module_exit(xt_fini);
+
diff --git a/net/netfilter/xt_CLASSIFY.c b/net/netfilter/xt_CLASSIFY.c
new file mode 100644
index 0000000..78ee266
--- /dev/null
+++ b/net/netfilter/xt_CLASSIFY.c
@@ -0,0 +1,109 @@
+/*
+ * This is a module which is used for setting the skb->priority field
+ * of an skb for qdisc classification.
+ */
+
+/* (C) 2001-2002 Patrick McHardy <kaber@trash.net>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_CLASSIFY.h>
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("iptables qdisc classification target module");
+MODULE_ALIAS("ipt_CLASSIFY");
+
+static unsigned int
+target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_classify_target_info *clinfo = targinfo;
+
+ if ((*pskb)->priority != clinfo->priority)
+ (*pskb)->priority = clinfo->priority;
+
+ return XT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ if (targinfosize != XT_ALIGN(sizeof(struct xt_classify_target_info))){
+ printk(KERN_ERR "CLASSIFY: invalid size (%u != %Zu).\n",
+ targinfosize,
+ XT_ALIGN(sizeof(struct xt_classify_target_info)));
+ return 0;
+ }
+
+ if (hook_mask & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_FORWARD) |
+ (1 << NF_IP_POST_ROUTING))) {
+ printk(KERN_ERR "CLASSIFY: only valid in LOCAL_OUT, FORWARD "
+ "and POST_ROUTING.\n");
+ return 0;
+ }
+
+ if (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_ERR "CLASSIFY: can only be called from "
+ "\"mangle\" table, not \"%s\".\n",
+ tablename);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_target classify_reg = {
+ .name = "CLASSIFY",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_target classify6_reg = {
+ .name = "CLASSIFY",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_target(AF_INET, &classify_reg);
+ if (ret)
+ return ret;
+
+ ret = xt_register_target(AF_INET6, &classify6_reg);
+ if (ret)
+ xt_unregister_target(AF_INET, &classify_reg);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_target(AF_INET, &classify_reg);
+ xt_unregister_target(AF_INET6, &classify6_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_CONNMARK.c b/net/netfilter/xt_CONNMARK.c
new file mode 100644
index 0000000..22506e3
--- /dev/null
+++ b/net/netfilter/xt_CONNMARK.c
@@ -0,0 +1,141 @@
+/* This kernel module is used to modify the connection mark values, or
+ * to optionally restore the skb nfmark from the connection mark
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables CONNMARK matching module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_CONNMARK");
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_CONNMARK.h>
+#include <net/netfilter/nf_conntrack_compat.h>
+
+static unsigned int
+target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_connmark_target_info *markinfo = targinfo;
+ u_int32_t diff;
+ u_int32_t nfmark;
+ u_int32_t newmark;
+ u_int32_t ctinfo;
+ u_int32_t *ctmark = nf_ct_get_mark(*pskb, &ctinfo);
+
+ if (ctmark) {
+ switch(markinfo->mode) {
+ case XT_CONNMARK_SET:
+ newmark = (*ctmark & ~markinfo->mask) | markinfo->mark;
+ if (newmark != *ctmark)
+ *ctmark = newmark;
+ break;
+ case XT_CONNMARK_SAVE:
+ newmark = (*ctmark & ~markinfo->mask) | ((*pskb)->nfmark & markinfo->mask);
+ if (*ctmark != newmark)
+ *ctmark = newmark;
+ break;
+ case XT_CONNMARK_RESTORE:
+ nfmark = (*pskb)->nfmark;
+ diff = (*ctmark ^ nfmark) & markinfo->mask;
+ if (diff != 0)
+ (*pskb)->nfmark = nfmark ^ diff;
+ break;
+ }
+ }
+
+ return XT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ struct xt_connmark_target_info *matchinfo = targinfo;
+ if (targinfosize != XT_ALIGN(sizeof(struct xt_connmark_target_info))) {
+ printk(KERN_WARNING "CONNMARK: targinfosize %u != %Zu\n",
+ targinfosize,
+ XT_ALIGN(sizeof(struct xt_connmark_target_info)));
+ return 0;
+ }
+
+ if (matchinfo->mode == XT_CONNMARK_RESTORE) {
+ if (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_WARNING "CONNMARK: restore can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+ }
+
+ if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) {
+ printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_target connmark_reg = {
+ .name = "CONNMARK",
+ .target = &target,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE
+};
+static struct xt_target connmark6_reg = {
+ .name = "CONNMARK",
+ .target = &target,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ need_conntrack();
+
+ ret = xt_register_target(AF_INET, &connmark_reg);
+ if (ret)
+ return ret;
+
+ ret = xt_register_target(AF_INET6, &connmark6_reg);
+ if (ret)
+ xt_unregister_target(AF_INET, &connmark_reg);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_target(AF_INET, &connmark_reg);
+ xt_unregister_target(AF_INET6, &connmark6_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_MARK.c b/net/netfilter/xt_MARK.c
new file mode 100644
index 0000000..0c11ee9
--- /dev/null
+++ b/net/netfilter/xt_MARK.c
@@ -0,0 +1,191 @@
+/* This is a module which is used for setting the NFMARK field of an skb. */
+
+/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_MARK.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("ip[6]tables MARK modification module");
+MODULE_ALIAS("ipt_MARK");
+MODULE_ALIAS("ip6t_MARK");
+
+static unsigned int
+target_v0(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_mark_target_info *markinfo = targinfo;
+
+ if((*pskb)->nfmark != markinfo->mark)
+ (*pskb)->nfmark = markinfo->mark;
+
+ return XT_CONTINUE;
+}
+
+static unsigned int
+target_v1(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_mark_target_info_v1 *markinfo = targinfo;
+ int mark = 0;
+
+ switch (markinfo->mode) {
+ case XT_MARK_SET:
+ mark = markinfo->mark;
+ break;
+
+ case XT_MARK_AND:
+ mark = (*pskb)->nfmark & markinfo->mark;
+ break;
+
+ case XT_MARK_OR:
+ mark = (*pskb)->nfmark | markinfo->mark;
+ break;
+ }
+
+ if((*pskb)->nfmark != mark)
+ (*pskb)->nfmark = mark;
+
+ return XT_CONTINUE;
+}
+
+
+static int
+checkentry_v0(const char *tablename,
+ const void *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ struct xt_mark_target_info *markinfo = targinfo;
+
+ if (targinfosize != XT_ALIGN(sizeof(struct xt_mark_target_info))) {
+ printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
+ targinfosize,
+ XT_ALIGN(sizeof(struct xt_mark_target_info)));
+ return 0;
+ }
+
+ if (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ if (markinfo->mark > 0xffffffff) {
+ printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+checkentry_v1(const char *tablename,
+ const void *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ struct xt_mark_target_info_v1 *markinfo = targinfo;
+
+ if (targinfosize != XT_ALIGN(sizeof(struct xt_mark_target_info_v1))){
+ printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
+ targinfosize,
+ XT_ALIGN(sizeof(struct xt_mark_target_info_v1)));
+ return 0;
+ }
+
+ if (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ if (markinfo->mode != XT_MARK_SET
+ && markinfo->mode != XT_MARK_AND
+ && markinfo->mode != XT_MARK_OR) {
+ printk(KERN_WARNING "MARK: unknown mode %u\n",
+ markinfo->mode);
+ return 0;
+ }
+
+ if (markinfo->mark > 0xffffffff) {
+ printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_target ipt_mark_reg_v0 = {
+ .name = "MARK",
+ .target = target_v0,
+ .checkentry = checkentry_v0,
+ .me = THIS_MODULE,
+ .revision = 0,
+};
+
+static struct xt_target ipt_mark_reg_v1 = {
+ .name = "MARK",
+ .target = target_v1,
+ .checkentry = checkentry_v1,
+ .me = THIS_MODULE,
+ .revision = 1,
+};
+
+static struct xt_target ip6t_mark_reg_v0 = {
+ .name = "MARK",
+ .target = target_v0,
+ .checkentry = checkentry_v0,
+ .me = THIS_MODULE,
+ .revision = 0,
+};
+
+static int __init init(void)
+{
+ int err;
+
+ err = xt_register_target(AF_INET, &ipt_mark_reg_v0);
+ if (err)
+ return err;
+
+ err = xt_register_target(AF_INET, &ipt_mark_reg_v1);
+ if (err)
+ xt_unregister_target(AF_INET, &ipt_mark_reg_v0);
+
+ err = xt_register_target(AF_INET6, &ip6t_mark_reg_v0);
+ if (err) {
+ xt_unregister_target(AF_INET, &ipt_mark_reg_v0);
+ xt_unregister_target(AF_INET, &ipt_mark_reg_v1);
+ }
+
+ return err;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_target(AF_INET, &ipt_mark_reg_v0);
+ xt_unregister_target(AF_INET, &ipt_mark_reg_v1);
+ xt_unregister_target(AF_INET6, &ip6t_mark_reg_v0);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c
new file mode 100644
index 0000000..8b76b6f
--- /dev/null
+++ b/net/netfilter/xt_NFQUEUE.c
@@ -0,0 +1,107 @@
+/* iptables module for using new netfilter netlink queue
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_arp.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_NFQUEUE.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("[ip,ip6,arp]_tables NFQUEUE target");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NFQUEUE");
+MODULE_ALIAS("ip6t_NFQUEUE");
+MODULE_ALIAS("arpt_NFQUEUE");
+
+static unsigned int
+target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_NFQ_info *tinfo = targinfo;
+
+ return NF_QUEUE_NR(tinfo->queuenum);
+}
+
+static int
+checkentry(const char *tablename,
+ const void *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ if (targinfosize != XT_ALIGN(sizeof(struct xt_NFQ_info))) {
+ printk(KERN_WARNING "NFQUEUE: targinfosize %u != %Zu\n",
+ targinfosize,
+ XT_ALIGN(sizeof(struct xt_NFQ_info)));
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_target ipt_NFQ_reg = {
+ .name = "NFQUEUE",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_target ip6t_NFQ_reg = {
+ .name = "NFQUEUE",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_target arpt_NFQ_reg = {
+ .name = "NFQUEUE",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_target(AF_INET, &ipt_NFQ_reg);
+ if (ret)
+ return ret;
+ ret = xt_register_target(AF_INET6, &ip6t_NFQ_reg);
+ if (ret)
+ goto out_ip;
+ ret = xt_register_target(NF_ARP, &arpt_NFQ_reg);
+ if (ret)
+ goto out_ip6;
+
+ return ret;
+out_ip6:
+ xt_unregister_target(AF_INET6, &ip6t_NFQ_reg);
+out_ip:
+ xt_unregister_target(AF_INET, &ipt_NFQ_reg);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_target(NF_ARP, &arpt_NFQ_reg);
+ xt_unregister_target(AF_INET6, &ip6t_NFQ_reg);
+ xt_unregister_target(AF_INET, &ipt_NFQ_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_NOTRACK.c b/net/netfilter/xt_NOTRACK.c
new file mode 100644
index 0000000..24d477a
--- /dev/null
+++ b/net/netfilter/xt_NOTRACK.c
@@ -0,0 +1,92 @@
+/* This is a module which is used for setting up fake conntracks
+ * on packets so that they are not seen by the conntrack/NAT code.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <net/netfilter/nf_conntrack_compat.h>
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NOTRACK");
+
+static unsigned int
+target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ /* Previously seen (loopback)? Ignore. */
+ if ((*pskb)->nfct != NULL)
+ return XT_CONTINUE;
+
+ /* Attach fake conntrack entry.
+ If there is a real ct entry correspondig to this packet,
+ it'll hang aroun till timing out. We don't deal with it
+ for performance reasons. JK */
+ nf_ct_untrack(*pskb);
+ (*pskb)->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get((*pskb)->nfct);
+
+ return XT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ if (targinfosize != 0) {
+ printk(KERN_WARNING "NOTRACK: targinfosize %u != 0\n",
+ targinfosize);
+ return 0;
+ }
+
+ if (strcmp(tablename, "raw") != 0) {
+ printk(KERN_WARNING "NOTRACK: can only be called from \"raw\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_target notrack_reg = {
+ .name = "NOTRACK",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_target notrack6_reg = {
+ .name = "NOTRACK",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_target(AF_INET, ¬rack_reg);
+ if (ret)
+ return ret;
+
+ ret = xt_register_target(AF_INET6, ¬rack6_reg);
+ if (ret)
+ xt_unregister_target(AF_INET, ¬rack_reg);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_target(AF_INET6, ¬rack6_reg);
+ xt_unregister_target(AF_INET, ¬rack_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_comment.c b/net/netfilter/xt_comment.c
new file mode 100644
index 0000000..4ba6fd6
--- /dev/null
+++ b/net/netfilter/xt_comment.c
@@ -0,0 +1,80 @@
+/*
+ * Implements a dummy match to allow attaching comments to rules
+ *
+ * 2003-05-13 Brad Fisher (brad@info-link.net)
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_comment.h>
+
+MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
+MODULE_DESCRIPTION("iptables comment match module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_comment");
+MODULE_ALIAS("ip6t_comment");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protooff,
+ int *hotdrop)
+{
+ /* We always match */
+ return 1;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ /* Check the size */
+ if (matchsize != XT_ALIGN(sizeof(struct xt_comment_info)))
+ return 0;
+ return 1;
+}
+
+static struct xt_match comment_match = {
+ .name = "comment",
+ .match = match,
+ .checkentry = checkentry,
+ .me = THIS_MODULE
+};
+
+static struct xt_match comment6_match = {
+ .name = "comment",
+ .match = match,
+ .checkentry = checkentry,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_match(AF_INET, &comment_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &comment6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &comment_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &comment_match);
+ xt_unregister_match(AF_INET6, &comment6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_connbytes.c b/net/netfilter/xt_connbytes.c
new file mode 100644
index 0000000..150d2a4
--- /dev/null
+++ b/net/netfilter/xt_connbytes.c
@@ -0,0 +1,180 @@
+/* Kernel module to match connection tracking byte counter.
+ * GPL (C) 2002 Martin Devera (devik@cdi.cz).
+ *
+ * 2004-07-20 Harald Welte <laforge@netfilter.org>
+ * - reimplemented to use per-connection accounting counters
+ * - add functionality to match number of packets
+ * - add functionality to match average packet size
+ * - add support to match directions seperately
+ * 2005-10-16 Harald Welte <laforge@netfilter.org>
+ * - Port to x_tables
+ *
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack_compat.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connbytes.h>
+
+#include <asm/div64.h>
+#include <asm/bitops.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("iptables match for matching number of pkts/bytes per connection");
+MODULE_ALIAS("ipt_connbytes");
+
+/* 64bit divisor, dividend and result. dynamic precision */
+static u_int64_t div64_64(u_int64_t dividend, u_int64_t divisor)
+{
+ u_int32_t d = divisor;
+
+ if (divisor > 0xffffffffULL) {
+ unsigned int shift = fls(divisor >> 32);
+
+ d = divisor >> shift;
+ dividend >>= shift;
+ }
+
+ do_div(dividend, d);
+ return dividend;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_connbytes_info *sinfo = matchinfo;
+ u_int64_t what = 0; /* initialize to make gcc happy */
+ const struct ip_conntrack_counter *counters;
+
+ if (!(counters = nf_ct_get_counters(skb)))
+ return 0; /* no match */
+
+ switch (sinfo->what) {
+ case XT_CONNBYTES_PKTS:
+ switch (sinfo->direction) {
+ case XT_CONNBYTES_DIR_ORIGINAL:
+ what = counters[IP_CT_DIR_ORIGINAL].packets;
+ break;
+ case XT_CONNBYTES_DIR_REPLY:
+ what = counters[IP_CT_DIR_REPLY].packets;
+ break;
+ case XT_CONNBYTES_DIR_BOTH:
+ what = counters[IP_CT_DIR_ORIGINAL].packets;
+ what += counters[IP_CT_DIR_REPLY].packets;
+ break;
+ }
+ break;
+ case XT_CONNBYTES_BYTES:
+ switch (sinfo->direction) {
+ case XT_CONNBYTES_DIR_ORIGINAL:
+ what = counters[IP_CT_DIR_ORIGINAL].bytes;
+ break;
+ case XT_CONNBYTES_DIR_REPLY:
+ what = counters[IP_CT_DIR_REPLY].bytes;
+ break;
+ case XT_CONNBYTES_DIR_BOTH:
+ what = counters[IP_CT_DIR_ORIGINAL].bytes;
+ what += counters[IP_CT_DIR_REPLY].bytes;
+ break;
+ }
+ break;
+ case XT_CONNBYTES_AVGPKT:
+ switch (sinfo->direction) {
+ case XT_CONNBYTES_DIR_ORIGINAL:
+ what = div64_64(counters[IP_CT_DIR_ORIGINAL].bytes,
+ counters[IP_CT_DIR_ORIGINAL].packets);
+ break;
+ case XT_CONNBYTES_DIR_REPLY:
+ what = div64_64(counters[IP_CT_DIR_REPLY].bytes,
+ counters[IP_CT_DIR_REPLY].packets);
+ break;
+ case XT_CONNBYTES_DIR_BOTH:
+ {
+ u_int64_t bytes;
+ u_int64_t pkts;
+ bytes = counters[IP_CT_DIR_ORIGINAL].bytes +
+ counters[IP_CT_DIR_REPLY].bytes;
+ pkts = counters[IP_CT_DIR_ORIGINAL].packets+
+ counters[IP_CT_DIR_REPLY].packets;
+
+ /* FIXME_THEORETICAL: what to do if sum
+ * overflows ? */
+
+ what = div64_64(bytes, pkts);
+ }
+ break;
+ }
+ break;
+ }
+
+ if (sinfo->count.to)
+ return (what <= sinfo->count.to && what >= sinfo->count.from);
+ else
+ return (what >= sinfo->count.from);
+}
+
+static int check(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct xt_connbytes_info *sinfo = matchinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_connbytes_info)))
+ return 0;
+
+ if (sinfo->what != XT_CONNBYTES_PKTS &&
+ sinfo->what != XT_CONNBYTES_BYTES &&
+ sinfo->what != XT_CONNBYTES_AVGPKT)
+ return 0;
+
+ if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL &&
+ sinfo->direction != XT_CONNBYTES_DIR_REPLY &&
+ sinfo->direction != XT_CONNBYTES_DIR_BOTH)
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match connbytes_match = {
+ .name = "connbytes",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE
+};
+static struct xt_match connbytes6_match = {
+ .name = "connbytes",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &connbytes_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &connbytes6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &connbytes_match);
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &connbytes_match);
+ xt_unregister_match(AF_INET6, &connbytes6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c
new file mode 100644
index 0000000..d06e925
--- /dev/null
+++ b/net/netfilter/xt_connmark.c
@@ -0,0 +1,109 @@
+/* This kernel module matches connection mark values set by the
+ * CONNMARK target
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
+MODULE_DESCRIPTION("IP tables connmark match module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_connmark");
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connmark.h>
+#include <net/netfilter/nf_conntrack_compat.h>
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_connmark_info *info = matchinfo;
+ u_int32_t ctinfo;
+ const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo);
+ if (!ctmark)
+ return 0;
+
+ return (((*ctmark) & info->mask) == info->mark) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct xt_connmark_info *cm =
+ (struct xt_connmark_info *)matchinfo;
+ if (matchsize != XT_ALIGN(sizeof(struct xt_connmark_info)))
+ return 0;
+
+ if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
+ printk(KERN_WARNING "connmark: only support 32bit mark\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_match connmark_match = {
+ .name = "connmark",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE
+};
+static struct xt_match connmark6_match = {
+ .name = "connmark",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE
+};
+
+
+static int __init init(void)
+{
+ int ret;
+
+ need_conntrack();
+
+ ret = xt_register_match(AF_INET, &connmark_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &connmark6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &connmark_match);
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET6, &connmark6_match);
+ xt_unregister_match(AF_INET, &connmark_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c
new file mode 100644
index 0000000..ffdebc9
--- /dev/null
+++ b/net/netfilter/xt_conntrack.c
@@ -0,0 +1,238 @@
+/* Kernel module to match connection tracking information.
+ * Superset of Rusty's minimalistic state match.
+ *
+ * (C) 2001 Marc Boucher (marc@mbsi.ca).
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
+#else
+#include <net/netfilter/nf_conntrack.h>
+#endif
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_conntrack.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables connection tracking match module");
+MODULE_ALIAS("ipt_conntrack");
+
+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_conntrack_info *sinfo = matchinfo;
+ struct ip_conntrack *ct;
+ enum ip_conntrack_info ctinfo;
+ unsigned int statebit;
+
+ ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+
+#define FWINV(bool,invflg) ((bool) ^ !!(sinfo->invflags & invflg))
+
+ if (ct == &ip_conntrack_untracked)
+ statebit = XT_CONNTRACK_STATE_UNTRACKED;
+ else if (ct)
+ statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
+ else
+ statebit = XT_CONNTRACK_STATE_INVALID;
+
+ if(sinfo->flags & XT_CONNTRACK_STATE) {
+ if (ct) {
+ if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip !=
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip)
+ statebit |= XT_CONNTRACK_STATE_SNAT;
+
+ if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip !=
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip)
+ statebit |= XT_CONNTRACK_STATE_DNAT;
+ }
+
+ if (FWINV((statebit & sinfo->statemask) == 0, XT_CONNTRACK_STATE))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_PROTO) {
+ if (!ct || FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, XT_CONNTRACK_PROTO))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGSRC) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, XT_CONNTRACK_ORIGSRC))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGDST) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, XT_CONNTRACK_ORIGDST))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLSRC) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].src.ip, XT_CONNTRACK_REPLSRC))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLDST) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, XT_CONNTRACK_REPLDST))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_STATUS) {
+ if (!ct || FWINV((ct->status & sinfo->statusmask) == 0, XT_CONNTRACK_STATUS))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_EXPIRES) {
+ unsigned long expires;
+
+ if(!ct)
+ return 0;
+
+ expires = timer_pending(&ct->timeout) ? (ct->timeout.expires - jiffies)/HZ : 0;
+
+ if (FWINV(!(expires >= sinfo->expires_min && expires <= sinfo->expires_max), XT_CONNTRACK_EXPIRES))
+ return 0;
+ }
+
+ return 1;
+}
+
+#else /* CONFIG_IP_NF_CONNTRACK */
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_conntrack_info *sinfo = matchinfo;
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ unsigned int statebit;
+
+ ct = nf_ct_get((struct sk_buff *)skb, &ctinfo);
+
+#define FWINV(bool,invflg) ((bool) ^ !!(sinfo->invflags & invflg))
+
+ if (ct == &nf_conntrack_untracked)
+ statebit = XT_CONNTRACK_STATE_UNTRACKED;
+ else if (ct)
+ statebit = XT_CONNTRACK_STATE_BIT(ctinfo);
+ else
+ statebit = XT_CONNTRACK_STATE_INVALID;
+
+ if(sinfo->flags & XT_CONNTRACK_STATE) {
+ if (ct) {
+ if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip !=
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip)
+ statebit |= XT_CONNTRACK_STATE_SNAT;
+
+ if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip !=
+ ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip)
+ statebit |= XT_CONNTRACK_STATE_DNAT;
+ }
+
+ if (FWINV((statebit & sinfo->statemask) == 0, XT_CONNTRACK_STATE))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_PROTO) {
+ if (!ct || FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, XT_CONNTRACK_PROTO))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGSRC) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip&sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, XT_CONNTRACK_ORIGSRC))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_ORIGDST) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip&sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, XT_CONNTRACK_ORIGDST))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLSRC) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip&sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].src.ip, XT_CONNTRACK_REPLSRC))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_REPLDST) {
+ if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip&sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, XT_CONNTRACK_REPLDST))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_STATUS) {
+ if (!ct || FWINV((ct->status & sinfo->statusmask) == 0, XT_CONNTRACK_STATUS))
+ return 0;
+ }
+
+ if(sinfo->flags & XT_CONNTRACK_EXPIRES) {
+ unsigned long expires;
+
+ if(!ct)
+ return 0;
+
+ expires = timer_pending(&ct->timeout) ? (ct->timeout.expires - jiffies)/HZ : 0;
+
+ if (FWINV(!(expires >= sinfo->expires_min && expires <= sinfo->expires_max), XT_CONNTRACK_EXPIRES))
+ return 0;
+ }
+
+ return 1;
+}
+
+#endif /* CONFIG_NF_IP_CONNTRACK */
+
+static int check(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (matchsize != XT_ALIGN(sizeof(struct xt_conntrack_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match conntrack_match = {
+ .name = "conntrack",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ need_conntrack();
+ ret = xt_register_match(AF_INET, &conntrack_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &conntrack_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_dccp.c b/net/netfilter/xt_dccp.c
new file mode 100644
index 0000000..779f42f
--- /dev/null
+++ b/net/netfilter/xt_dccp.c
@@ -0,0 +1,221 @@
+/*
+ * iptables module for DCCP protocol header matching
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <net/ip.h>
+#include <linux/dccp.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_dccp.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Match for DCCP protocol packets");
+MODULE_ALIAS("ipt_dccp");
+
+#define DCCHECK(cond, option, flag, invflag) (!((flag) & (option)) \
+ || (!!((invflag) & (option)) ^ (cond)))
+
+static unsigned char *dccp_optbuf;
+static DEFINE_SPINLOCK(dccp_buflock);
+
+static inline int
+dccp_find_option(u_int8_t option,
+ const struct sk_buff *skb,
+ unsigned int protoff,
+ const struct dccp_hdr *dh,
+ int *hotdrop)
+{
+ /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+ unsigned char *op;
+ unsigned int optoff = __dccp_hdr_len(dh);
+ unsigned int optlen = dh->dccph_doff*4 - __dccp_hdr_len(dh);
+ unsigned int i;
+
+ if (dh->dccph_doff * 4 < __dccp_hdr_len(dh)) {
+ *hotdrop = 1;
+ return 0;
+ }
+
+ if (!optlen)
+ return 0;
+
+ spin_lock_bh(&dccp_buflock);
+ op = skb_header_pointer(skb, protoff + optoff, optlen, dccp_optbuf);
+ if (op == NULL) {
+ /* If we don't have the whole header, drop packet. */
+ spin_unlock_bh(&dccp_buflock);
+ *hotdrop = 1;
+ return 0;
+ }
+
+ for (i = 0; i < optlen; ) {
+ if (op[i] == option) {
+ spin_unlock_bh(&dccp_buflock);
+ return 1;
+ }
+
+ if (op[i] < 2)
+ i++;
+ else
+ i += op[i+1]?:1;
+ }
+
+ spin_unlock_bh(&dccp_buflock);
+ return 0;
+}
+
+
+static inline int
+match_types(const struct dccp_hdr *dh, u_int16_t typemask)
+{
+ return (typemask & (1 << dh->dccph_type));
+}
+
+static inline int
+match_option(u_int8_t option, const struct sk_buff *skb, unsigned int protoff,
+ const struct dccp_hdr *dh, int *hotdrop)
+{
+ return dccp_find_option(option, skb, protoff, dh, hotdrop);
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_dccp_info *info =
+ (const struct xt_dccp_info *)matchinfo;
+ struct dccp_hdr _dh, *dh;
+
+ if (offset)
+ return 0;
+
+ dh = skb_header_pointer(skb, protoff, sizeof(_dh), &_dh);
+ if (dh == NULL) {
+ *hotdrop = 1;
+ return 0;
+ }
+
+ return DCCHECK(((ntohs(dh->dccph_sport) >= info->spts[0])
+ && (ntohs(dh->dccph_sport) <= info->spts[1])),
+ XT_DCCP_SRC_PORTS, info->flags, info->invflags)
+ && DCCHECK(((ntohs(dh->dccph_dport) >= info->dpts[0])
+ && (ntohs(dh->dccph_dport) <= info->dpts[1])),
+ XT_DCCP_DEST_PORTS, info->flags, info->invflags)
+ && DCCHECK(match_types(dh, info->typemask),
+ XT_DCCP_TYPE, info->flags, info->invflags)
+ && DCCHECK(match_option(info->option, skb, protoff, dh,
+ hotdrop),
+ XT_DCCP_OPTION, info->flags, info->invflags);
+}
+
+static int
+checkentry(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = inf;
+ const struct xt_dccp_info *info;
+
+ info = (const struct xt_dccp_info *)matchinfo;
+
+ return ip->proto == IPPROTO_DCCP
+ && !(ip->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_dccp_info))
+ && !(info->flags & ~XT_DCCP_VALID_FLAGS)
+ && !(info->invflags & ~XT_DCCP_VALID_FLAGS)
+ && !(info->invflags & ~info->flags);
+}
+
+static int
+checkentry6(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ip = inf;
+ const struct xt_dccp_info *info;
+
+ info = (const struct xt_dccp_info *)matchinfo;
+
+ return ip->proto == IPPROTO_DCCP
+ && !(ip->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_dccp_info))
+ && !(info->flags & ~XT_DCCP_VALID_FLAGS)
+ && !(info->invflags & ~XT_DCCP_VALID_FLAGS)
+ && !(info->invflags & ~info->flags);
+}
+
+
+static struct xt_match dccp_match =
+{
+ .name = "dccp",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match dccp6_match =
+{
+ .name = "dccp",
+ .match = &match,
+ .checkentry = &checkentry6,
+ .me = THIS_MODULE,
+};
+
+
+static int __init init(void)
+{
+ int ret;
+
+ /* doff is 8 bits, so the maximum option size is (4*256). Don't put
+ * this in BSS since DaveM is worried about locked TLB's for kernel
+ * BSS. */
+ dccp_optbuf = kmalloc(256 * 4, GFP_KERNEL);
+ if (!dccp_optbuf)
+ return -ENOMEM;
+ ret = xt_register_match(AF_INET, &dccp_match);
+ if (ret)
+ goto out_kfree;
+ ret = xt_register_match(AF_INET6, &dccp6_match);
+ if (ret)
+ goto out_unreg;
+
+ return ret;
+
+out_unreg:
+ xt_unregister_match(AF_INET, &dccp_match);
+out_kfree:
+ kfree(dccp_optbuf);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET6, &dccp6_match);
+ xt_unregister_match(AF_INET, &dccp_match);
+ kfree(dccp_optbuf);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_helper.c b/net/netfilter/xt_helper.c
new file mode 100644
index 0000000..38b6715
--- /dev/null
+++ b/net/netfilter/xt_helper.c
@@ -0,0 +1,188 @@
+/* iptables module to match on related connections */
+/*
+ * (C) 2001 Martin Josefsson <gandalf@wlug.westbo.se>
+ *
+ * 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.
+ *
+ * 19 Mar 2002 Harald Welte <laforge@gnumonks.org>:
+ * - Port to newnat infrastructure
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#else
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#endif
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_helper.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
+MODULE_DESCRIPTION("iptables helper match module");
+MODULE_ALIAS("ipt_helper");
+MODULE_ALIAS("ip6t_helper");
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_helper_info *info = matchinfo;
+ struct ip_conntrack *ct;
+ enum ip_conntrack_info ctinfo;
+ int ret = info->invert;
+
+ ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo);
+ if (!ct) {
+ DEBUGP("xt_helper: Eek! invalid conntrack?\n");
+ return ret;
+ }
+
+ if (!ct->master) {
+ DEBUGP("xt_helper: conntrack %p has no master\n", ct);
+ return ret;
+ }
+
+ read_lock_bh(&ip_conntrack_lock);
+ if (!ct->master->helper) {
+ DEBUGP("xt_helper: master ct %p has no helper\n",
+ exp->expectant);
+ goto out_unlock;
+ }
+
+ DEBUGP("master's name = %s , info->name = %s\n",
+ ct->master->helper->name, info->name);
+
+ if (info->name[0] == '\0')
+ ret ^= 1;
+ else
+ ret ^= !strncmp(ct->master->helper->name, info->name,
+ strlen(ct->master->helper->name));
+out_unlock:
+ read_unlock_bh(&ip_conntrack_lock);
+ return ret;
+}
+
+#else /* CONFIG_IP_NF_CONNTRACK */
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_helper_info *info = matchinfo;
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ int ret = info->invert;
+
+ ct = nf_ct_get((struct sk_buff *)skb, &ctinfo);
+ if (!ct) {
+ DEBUGP("xt_helper: Eek! invalid conntrack?\n");
+ return ret;
+ }
+
+ if (!ct->master) {
+ DEBUGP("xt_helper: conntrack %p has no master\n", ct);
+ return ret;
+ }
+
+ read_lock_bh(&nf_conntrack_lock);
+ if (!ct->master->helper) {
+ DEBUGP("xt_helper: master ct %p has no helper\n",
+ exp->expectant);
+ goto out_unlock;
+ }
+
+ DEBUGP("master's name = %s , info->name = %s\n",
+ ct->master->helper->name, info->name);
+
+ if (info->name[0] == '\0')
+ ret ^= 1;
+ else
+ ret ^= !strncmp(ct->master->helper->name, info->name,
+ strlen(ct->master->helper->name));
+out_unlock:
+ read_unlock_bh(&nf_conntrack_lock);
+ return ret;
+}
+#endif
+
+static int check(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct xt_helper_info *info = matchinfo;
+
+ info->name[29] = '\0';
+
+ /* verify size */
+ if (matchsize != XT_ALIGN(sizeof(struct xt_helper_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match helper_match = {
+ .name = "helper",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE,
+};
+static struct xt_match helper6_match = {
+ .name = "helper",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ need_conntrack();
+
+ ret = xt_register_match(AF_INET, &helper_match);
+ if (ret < 0)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &helper6_match);
+ if (ret < 0)
+ xt_unregister_match(AF_INET, &helper_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &helper_match);
+ xt_unregister_match(AF_INET6, &helper6_match);
+}
+
+module_init(init);
+module_exit(fini);
+
diff --git a/net/netfilter/xt_length.c b/net/netfilter/xt_length.c
new file mode 100644
index 0000000..ab6c710
--- /dev/null
+++ b/net/netfilter/xt_length.c
@@ -0,0 +1,98 @@
+/* Kernel module to match packet length. */
+/* (C) 1999-2001 James Morris <jmorros@intercode.com.au>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+
+#include <linux/netfilter/xt_length.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+MODULE_DESCRIPTION("IP tables packet length matching module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_length");
+MODULE_ALIAS("ip6t_length");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_length_info *info = matchinfo;
+ u_int16_t pktlen = ntohs(skb->nh.iph->tot_len);
+
+ return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
+}
+
+static int
+match6(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_length_info *info = matchinfo;
+ u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
+
+ return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (matchsize != XT_ALIGN(sizeof(struct xt_length_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match length_match = {
+ .name = "length",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match length6_match = {
+ .name = "length",
+ .match = &match6,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &length_match);
+ if (ret)
+ return ret;
+ ret = xt_register_match(AF_INET6, &length6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &length_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &length_match);
+ xt_unregister_match(AF_INET6, &length6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_limit.c b/net/netfilter/xt_limit.c
new file mode 100644
index 0000000..15e4050
--- /dev/null
+++ b/net/netfilter/xt_limit.c
@@ -0,0 +1,175 @@
+/* Kernel module to control the rate
+ *
+ * 2 September 1999: Changed from the target RATE to the match
+ * `limit', removed logging. Did I mention that
+ * Alexey is a fucking genius?
+ * Rusty Russell (rusty@rustcorp.com.au). */
+
+/* (C) 1999 Jérôme de Vivie <devivie@info.enserb.u-bordeaux.fr>
+ * (C) 1999 Hervé Eychenne <eychenne@info.enserb.u-bordeaux.fr>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_limit.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Herve Eychenne <rv@wallfire.org>");
+MODULE_DESCRIPTION("iptables rate limit match");
+MODULE_ALIAS("ipt_limit");
+MODULE_ALIAS("ip6t_limit");
+
+/* The algorithm used is the Simple Token Bucket Filter (TBF)
+ * see net/sched/sch_tbf.c in the linux source tree
+ */
+
+static DEFINE_SPINLOCK(limit_lock);
+
+/* Rusty: This is my (non-mathematically-inclined) understanding of
+ this algorithm. The `average rate' in jiffies becomes your initial
+ amount of credit `credit' and the most credit you can ever have
+ `credit_cap'. The `peak rate' becomes the cost of passing the
+ test, `cost'.
+
+ `prev' tracks the last packet hit: you gain one credit per jiffy.
+ If you get credit balance more than this, the extra credit is
+ discarded. Every time the match passes, you lose `cost' credits;
+ if you don't have that many, the test fails.
+
+ See Alexey's formal explanation in net/sched/sch_tbf.c.
+
+ To get the maxmum range, we multiply by this factor (ie. you get N
+ credits per jiffy). We want to allow a rate as low as 1 per day
+ (slowest userspace tool allows), which means
+ CREDITS_PER_JIFFY*HZ*60*60*24 < 2^32. ie. */
+#define MAX_CPJ (0xFFFFFFFF / (HZ*60*60*24))
+
+/* Repeated shift and or gives us all 1s, final shift and add 1 gives
+ * us the power of 2 below the theoretical max, so GCC simply does a
+ * shift. */
+#define _POW2_BELOW2(x) ((x)|((x)>>1))
+#define _POW2_BELOW4(x) (_POW2_BELOW2(x)|_POW2_BELOW2((x)>>2))
+#define _POW2_BELOW8(x) (_POW2_BELOW4(x)|_POW2_BELOW4((x)>>4))
+#define _POW2_BELOW16(x) (_POW2_BELOW8(x)|_POW2_BELOW8((x)>>8))
+#define _POW2_BELOW32(x) (_POW2_BELOW16(x)|_POW2_BELOW16((x)>>16))
+#define POW2_BELOW32(x) ((_POW2_BELOW32(x)>>1) + 1)
+
+#define CREDITS_PER_JIFFY POW2_BELOW32(MAX_CPJ)
+
+static int
+ipt_limit_match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct xt_rateinfo *r = ((struct xt_rateinfo *)matchinfo)->master;
+ unsigned long now = jiffies;
+
+ spin_lock_bh(&limit_lock);
+ r->credit += (now - xchg(&r->prev, now)) * CREDITS_PER_JIFFY;
+ if (r->credit > r->credit_cap)
+ r->credit = r->credit_cap;
+
+ if (r->credit >= r->cost) {
+ /* We're not limited. */
+ r->credit -= r->cost;
+ spin_unlock_bh(&limit_lock);
+ return 1;
+ }
+
+ spin_unlock_bh(&limit_lock);
+ return 0;
+}
+
+/* Precision saver. */
+static u_int32_t
+user2credits(u_int32_t user)
+{
+ /* If multiplying would overflow... */
+ if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
+ /* Divide first. */
+ return (user / XT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
+
+ return (user * HZ * CREDITS_PER_JIFFY) / XT_LIMIT_SCALE;
+}
+
+static int
+ipt_limit_checkentry(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct xt_rateinfo *r = matchinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_rateinfo)))
+ return 0;
+
+ /* Check for overflow. */
+ if (r->burst == 0
+ || user2credits(r->avg * r->burst) < user2credits(r->avg)) {
+ printk("Overflow in xt_limit, try lower: %u/%u\n",
+ r->avg, r->burst);
+ return 0;
+ }
+
+ /* User avg in seconds * XT_LIMIT_SCALE: convert to jiffies *
+ 128. */
+ r->prev = jiffies;
+ r->credit = user2credits(r->avg * r->burst); /* Credits full. */
+ r->credit_cap = user2credits(r->avg * r->burst); /* Credits full. */
+ r->cost = user2credits(r->avg);
+
+ /* For SMP, we only want to use one set of counters. */
+ r->master = r;
+
+ return 1;
+}
+
+static struct xt_match ipt_limit_reg = {
+ .name = "limit",
+ .match = ipt_limit_match,
+ .checkentry = ipt_limit_checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match limit6_reg = {
+ .name = "limit",
+ .match = ipt_limit_match,
+ .checkentry = ipt_limit_checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_match(AF_INET, &ipt_limit_reg);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &limit6_reg);
+ if (ret)
+ xt_unregister_match(AF_INET, &ipt_limit_reg);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &ipt_limit_reg);
+ xt_unregister_match(AF_INET6, &limit6_reg);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_mac.c b/net/netfilter/xt_mac.c
new file mode 100644
index 0000000..0461dcb
--- /dev/null
+++ b/net/netfilter/xt_mac.c
@@ -0,0 +1,100 @@
+/* Kernel module to match MAC address parameters. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <linux/etherdevice.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter/xt_mac.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables mac matching module");
+MODULE_ALIAS("ipt_mac");
+MODULE_ALIAS("ip6t_mac");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_mac_info *info = matchinfo;
+
+ /* Is mac pointer valid? */
+ return (skb->mac.raw >= skb->head
+ && (skb->mac.raw + ETH_HLEN) <= skb->data
+ /* If so, compare... */
+ && ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
+ ^ info->invert));
+}
+
+static int
+ipt_mac_checkentry(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ /* FORWARD isn't always valid, but it's nice to be able to do --RR */
+ if (hook_mask
+ & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN)
+ | (1 << NF_IP_FORWARD))) {
+ printk("xt_mac: only valid for PRE_ROUTING, LOCAL_IN or FORWARD.\n");
+ return 0;
+ }
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_mac_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match mac_match = {
+ .name = "mac",
+ .match = &match,
+ .checkentry = &ipt_mac_checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match mac6_match = {
+ .name = "mac",
+ .match = &match,
+ .checkentry = &ipt_mac_checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &mac_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &mac6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &mac_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &mac_match);
+ xt_unregister_match(AF_INET6, &mac6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_mark.c b/net/netfilter/xt_mark.c
new file mode 100644
index 0000000..2a0ac62
--- /dev/null
+++ b/net/netfilter/xt_mark.c
@@ -0,0 +1,91 @@
+/* Kernel module to match NFMARK values. */
+
+/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter/xt_mark.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables mark matching module");
+MODULE_ALIAS("ipt_mark");
+MODULE_ALIAS("ip6t_mark");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_mark_info *info = matchinfo;
+
+ return ((skb->nfmark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+ const void *entry,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct xt_mark_info *minfo = (struct xt_mark_info *) matchinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_mark_info)))
+ return 0;
+
+ if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) {
+ printk(KERN_WARNING "mark: only supports 32bit mark\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_match mark_match = {
+ .name = "mark",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match mark6_match = {
+ .name = "mark",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &mark_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &mark6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &mark_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &mark_match);
+ xt_unregister_match(AF_INET6, &mark6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
new file mode 100644
index 0000000..19bb57c
--- /dev/null
+++ b/net/netfilter/xt_physdev.c
@@ -0,0 +1,155 @@
+/* Kernel module to match the bridge port in and
+ * out device for IP packets coming into contact with a bridge. */
+
+/* (C) 2001-2003 Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter/xt_physdev.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_bridge.h>
+#define MATCH 1
+#define NOMATCH 0
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("iptables bridge physical device match module");
+MODULE_ALIAS("ipt_physdev");
+MODULE_ALIAS("ip6t_physdev");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ int i;
+ static const char nulldevname[IFNAMSIZ];
+ const struct xt_physdev_info *info = matchinfo;
+ unsigned int ret;
+ const char *indev, *outdev;
+ struct nf_bridge_info *nf_bridge;
+
+ /* Not a bridged IP packet or no info available yet:
+ * LOCAL_OUT/mangle and LOCAL_OUT/nat don't know if
+ * the destination device will be a bridge. */
+ if (!(nf_bridge = skb->nf_bridge)) {
+ /* Return MATCH if the invert flags of the used options are on */
+ if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
+ !(info->invert & XT_PHYSDEV_OP_BRIDGED))
+ return NOMATCH;
+ if ((info->bitmask & XT_PHYSDEV_OP_ISIN) &&
+ !(info->invert & XT_PHYSDEV_OP_ISIN))
+ return NOMATCH;
+ if ((info->bitmask & XT_PHYSDEV_OP_ISOUT) &&
+ !(info->invert & XT_PHYSDEV_OP_ISOUT))
+ return NOMATCH;
+ if ((info->bitmask & XT_PHYSDEV_OP_IN) &&
+ !(info->invert & XT_PHYSDEV_OP_IN))
+ return NOMATCH;
+ if ((info->bitmask & XT_PHYSDEV_OP_OUT) &&
+ !(info->invert & XT_PHYSDEV_OP_OUT))
+ return NOMATCH;
+ return MATCH;
+ }
+
+ /* This only makes sense in the FORWARD and POSTROUTING chains */
+ if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
+ (!!(nf_bridge->mask & BRNF_BRIDGED) ^
+ !(info->invert & XT_PHYSDEV_OP_BRIDGED)))
+ return NOMATCH;
+
+ if ((info->bitmask & XT_PHYSDEV_OP_ISIN &&
+ (!nf_bridge->physindev ^ !!(info->invert & XT_PHYSDEV_OP_ISIN))) ||
+ (info->bitmask & XT_PHYSDEV_OP_ISOUT &&
+ (!nf_bridge->physoutdev ^ !!(info->invert & XT_PHYSDEV_OP_ISOUT))))
+ return NOMATCH;
+
+ if (!(info->bitmask & XT_PHYSDEV_OP_IN))
+ goto match_outdev;
+ indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
+ for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+ ret |= (((const unsigned int *)indev)[i]
+ ^ ((const unsigned int *)info->physindev)[i])
+ & ((const unsigned int *)info->in_mask)[i];
+ }
+
+ if ((ret == 0) ^ !(info->invert & XT_PHYSDEV_OP_IN))
+ return NOMATCH;
+
+match_outdev:
+ if (!(info->bitmask & XT_PHYSDEV_OP_OUT))
+ return MATCH;
+ outdev = nf_bridge->physoutdev ?
+ nf_bridge->physoutdev->name : nulldevname;
+ for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned int); i++) {
+ ret |= (((const unsigned int *)outdev)[i]
+ ^ ((const unsigned int *)info->physoutdev)[i])
+ & ((const unsigned int *)info->out_mask)[i];
+ }
+
+ return (ret != 0) ^ !(info->invert & XT_PHYSDEV_OP_OUT);
+}
+
+static int
+checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct xt_physdev_info *info = matchinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_physdev_info)))
+ return 0;
+ if (!(info->bitmask & XT_PHYSDEV_OP_MASK) ||
+ info->bitmask & ~XT_PHYSDEV_OP_MASK)
+ return 0;
+ return 1;
+}
+
+static struct xt_match physdev_match = {
+ .name = "physdev",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match physdev6_match = {
+ .name = "physdev",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_match(AF_INET, &physdev_match);
+ if (ret < 0)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &physdev6_match);
+ if (ret < 0)
+ xt_unregister_match(AF_INET, &physdev_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &physdev_match);
+ xt_unregister_match(AF_INET6, &physdev6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_pkttype.c b/net/netfilter/xt_pkttype.c
new file mode 100644
index 0000000..ab1b263
--- /dev/null
+++ b/net/netfilter/xt_pkttype.c
@@ -0,0 +1,82 @@
+/* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+
+#include <linux/netfilter/xt_pkttype.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
+MODULE_DESCRIPTION("IP tables match to match on linklayer packet type");
+MODULE_ALIAS("ipt_pkttype");
+MODULE_ALIAS("ip6t_pkttype");
+
+static int match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_pkttype_info *info = matchinfo;
+
+ return (skb->pkt_type == info->pkttype) ^ info->invert;
+}
+
+static int checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (matchsize != XT_ALIGN(sizeof(struct xt_pkttype_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match pkttype_match = {
+ .name = "pkttype",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match pkttype6_match = {
+ .name = "pkttype",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &pkttype_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &pkttype6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &pkttype_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &pkttype_match);
+ xt_unregister_match(AF_INET6, &pkttype6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_realm.c b/net/netfilter/xt_realm.c
new file mode 100644
index 0000000..2b7e178
--- /dev/null
+++ b/net/netfilter/xt_realm.c
@@ -0,0 +1,79 @@
+/* IP tables module for matching the routing realm
+ *
+ * $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $
+ *
+ * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <net/route.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter/xt_realm.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("X_tables realm match");
+MODULE_ALIAS("ipt_realm");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_realm_info *info = matchinfo;
+ struct dst_entry *dst = skb->dst;
+
+ return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
+}
+
+static int check(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (hook_mask
+ & ~((1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) |
+ (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN))) {
+ printk("xt_realm: only valid for POST_ROUTING, LOCAL_OUT, "
+ "LOCAL_IN or FORWARD.\n");
+ return 0;
+ }
+ if (matchsize != XT_ALIGN(sizeof(struct xt_realm_info))) {
+ printk("xt_realm: invalid matchsize.\n");
+ return 0;
+ }
+ return 1;
+}
+
+static struct xt_match realm_match = {
+ .name = "realm",
+ .match = match,
+ .checkentry = check,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ return xt_register_match(AF_INET, &realm_match);
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &realm_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_sctp.c b/net/netfilter/xt_sctp.c
new file mode 100644
index 0000000..10fbfc5
--- /dev/null
+++ b/net/netfilter/xt_sctp.c
@@ -0,0 +1,250 @@
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <linux/sctp.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_sctp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kiran Kumar Immidi");
+MODULE_DESCRIPTION("Match for SCTP protocol packets");
+MODULE_ALIAS("ipt_sctp");
+
+#ifdef DEBUG_SCTP
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+#define SCCHECK(cond, option, flag, invflag) (!((flag) & (option)) \
+ || (!!((invflag) & (option)) ^ (cond)))
+
+static int
+match_flags(const struct xt_sctp_flag_info *flag_info,
+ const int flag_count,
+ u_int8_t chunktype,
+ u_int8_t chunkflags)
+{
+ int i;
+
+ for (i = 0; i < flag_count; i++) {
+ if (flag_info[i].chunktype == chunktype) {
+ return (chunkflags & flag_info[i].flag_mask) == flag_info[i].flag;
+ }
+ }
+
+ return 1;
+}
+
+static inline int
+match_packet(const struct sk_buff *skb,
+ unsigned int offset,
+ const u_int32_t *chunkmap,
+ int chunk_match_type,
+ const struct xt_sctp_flag_info *flag_info,
+ const int flag_count,
+ int *hotdrop)
+{
+ u_int32_t chunkmapcopy[256 / sizeof (u_int32_t)];
+ sctp_chunkhdr_t _sch, *sch;
+
+#ifdef DEBUG_SCTP
+ int i = 0;
+#endif
+
+ if (chunk_match_type == SCTP_CHUNK_MATCH_ALL) {
+ SCTP_CHUNKMAP_COPY(chunkmapcopy, chunkmap);
+ }
+
+ do {
+ sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch);
+ if (sch == NULL) {
+ duprintf("Dropping invalid SCTP packet.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ duprintf("Chunk num: %d\toffset: %d\ttype: %d\tlength: %d\tflags: %x\n",
+ ++i, offset, sch->type, htons(sch->length), sch->flags);
+
+ offset += (htons(sch->length) + 3) & ~3;
+
+ duprintf("skb->len: %d\toffset: %d\n", skb->len, offset);
+
+ if (SCTP_CHUNKMAP_IS_SET(chunkmap, sch->type)) {
+ switch (chunk_match_type) {
+ case SCTP_CHUNK_MATCH_ANY:
+ if (match_flags(flag_info, flag_count,
+ sch->type, sch->flags)) {
+ return 1;
+ }
+ break;
+
+ case SCTP_CHUNK_MATCH_ALL:
+ if (match_flags(flag_info, flag_count,
+ sch->type, sch->flags)) {
+ SCTP_CHUNKMAP_CLEAR(chunkmapcopy, sch->type);
+ }
+ break;
+
+ case SCTP_CHUNK_MATCH_ONLY:
+ if (!match_flags(flag_info, flag_count,
+ sch->type, sch->flags)) {
+ return 0;
+ }
+ break;
+ }
+ } else {
+ switch (chunk_match_type) {
+ case SCTP_CHUNK_MATCH_ONLY:
+ return 0;
+ }
+ }
+ } while (offset < skb->len);
+
+ switch (chunk_match_type) {
+ case SCTP_CHUNK_MATCH_ALL:
+ return SCTP_CHUNKMAP_IS_CLEAR(chunkmap);
+ case SCTP_CHUNK_MATCH_ANY:
+ return 0;
+ case SCTP_CHUNK_MATCH_ONLY:
+ return 1;
+ }
+
+ /* This will never be reached, but required to stop compiler whine */
+ return 0;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_sctp_info *info;
+ sctp_sctphdr_t _sh, *sh;
+
+ info = (const struct xt_sctp_info *)matchinfo;
+
+ if (offset) {
+ duprintf("Dropping non-first fragment.. FIXME\n");
+ return 0;
+ }
+
+ sh = skb_header_pointer(skb, protoff, sizeof(_sh), &_sh);
+ if (sh == NULL) {
+ duprintf("Dropping evil TCP offset=0 tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+ duprintf("spt: %d\tdpt: %d\n", ntohs(sh->source), ntohs(sh->dest));
+
+ return SCCHECK(((ntohs(sh->source) >= info->spts[0])
+ && (ntohs(sh->source) <= info->spts[1])),
+ XT_SCTP_SRC_PORTS, info->flags, info->invflags)
+ && SCCHECK(((ntohs(sh->dest) >= info->dpts[0])
+ && (ntohs(sh->dest) <= info->dpts[1])),
+ XT_SCTP_DEST_PORTS, info->flags, info->invflags)
+ && SCCHECK(match_packet(skb, protoff,
+ info->chunkmap, info->chunk_match_type,
+ info->flag_info, info->flag_count,
+ hotdrop),
+ XT_SCTP_CHUNK_TYPES, info->flags, info->invflags);
+}
+
+static int
+checkentry(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct xt_sctp_info *info;
+ const struct ipt_ip *ip = inf;
+
+ info = (const struct xt_sctp_info *)matchinfo;
+
+ return ip->proto == IPPROTO_SCTP
+ && !(ip->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_sctp_info))
+ && !(info->flags & ~XT_SCTP_VALID_FLAGS)
+ && !(info->invflags & ~XT_SCTP_VALID_FLAGS)
+ && !(info->invflags & ~info->flags)
+ && ((!(info->flags & XT_SCTP_CHUNK_TYPES)) ||
+ (info->chunk_match_type &
+ (SCTP_CHUNK_MATCH_ALL
+ | SCTP_CHUNK_MATCH_ANY
+ | SCTP_CHUNK_MATCH_ONLY)));
+}
+
+static int
+checkentry6(const char *tablename,
+ const void *inf,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct xt_sctp_info *info;
+ const struct ip6t_ip6 *ip = inf;
+
+ info = (const struct xt_sctp_info *)matchinfo;
+
+ return ip->proto == IPPROTO_SCTP
+ && !(ip->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_sctp_info))
+ && !(info->flags & ~XT_SCTP_VALID_FLAGS)
+ && !(info->invflags & ~XT_SCTP_VALID_FLAGS)
+ && !(info->invflags & ~info->flags)
+ && ((!(info->flags & XT_SCTP_CHUNK_TYPES)) ||
+ (info->chunk_match_type &
+ (SCTP_CHUNK_MATCH_ALL
+ | SCTP_CHUNK_MATCH_ANY
+ | SCTP_CHUNK_MATCH_ONLY)));
+}
+
+
+static struct xt_match sctp_match =
+{
+ .name = "sctp",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE
+};
+static struct xt_match sctp6_match =
+{
+ .name = "sctp",
+ .match = &match,
+ .checkentry = &checkentry6,
+ .me = THIS_MODULE
+};
+
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &sctp_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &sctp6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &sctp_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET6, &sctp6_match);
+ xt_unregister_match(AF_INET, &sctp_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_state.c b/net/netfilter/xt_state.c
new file mode 100644
index 0000000..39ce808
--- /dev/null
+++ b/net/netfilter/xt_state.c
@@ -0,0 +1,96 @@
+/* Kernel module to match connection tracking information. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack_compat.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_state.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
+MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
+MODULE_ALIAS("ipt_state");
+MODULE_ALIAS("ip6t_state");
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_state_info *sinfo = matchinfo;
+ enum ip_conntrack_info ctinfo;
+ unsigned int statebit;
+
+ if (nf_ct_is_untracked(skb))
+ statebit = XT_STATE_UNTRACKED;
+ else if (!nf_ct_get_ctinfo(skb, &ctinfo))
+ statebit = XT_STATE_INVALID;
+ else
+ statebit = XT_STATE_BIT(ctinfo);
+
+ return (sinfo->statemask & statebit);
+}
+
+static int check(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (matchsize != XT_ALIGN(sizeof(struct xt_state_info)))
+ return 0;
+
+ return 1;
+}
+
+static struct xt_match state_match = {
+ .name = "state",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match state6_match = {
+ .name = "state",
+ .match = &match,
+ .checkentry = &check,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ need_conntrack();
+
+ ret = xt_register_match(AF_INET, &state_match);
+ if (ret < 0)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &state6_match);
+ if (ret < 0)
+ xt_unregister_match(AF_INET,&state_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &state_match);
+ xt_unregister_match(AF_INET6, &state6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_string.c b/net/netfilter/xt_string.c
new file mode 100644
index 0000000..7c7d5c8
--- /dev/null
+++ b/net/netfilter/xt_string.c
@@ -0,0 +1,111 @@
+/* String matching match for iptables
+ *
+ * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_string.h>
+#include <linux/textsearch.h>
+
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>");
+MODULE_DESCRIPTION("IP tables string match module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_string");
+MODULE_ALIAS("ip6t_string");
+
+static int match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct ts_state state;
+ struct xt_string_info *conf = (struct xt_string_info *) matchinfo;
+
+ memset(&state, 0, sizeof(struct ts_state));
+
+ return (skb_find_text((struct sk_buff *)skb, conf->from_offset,
+ conf->to_offset, conf->config, &state)
+ != UINT_MAX) && !conf->invert;
+}
+
+#define STRING_TEXT_PRIV(m) ((struct xt_string_info *) m)
+
+static int checkentry(const char *tablename,
+ const void *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct xt_string_info *conf = matchinfo;
+ struct ts_config *ts_conf;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_string_info)))
+ return 0;
+
+ /* Damn, can't handle this case properly with iptables... */
+ if (conf->from_offset > conf->to_offset)
+ return 0;
+
+ ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen,
+ GFP_KERNEL, TS_AUTOLOAD);
+ if (IS_ERR(ts_conf))
+ return 0;
+
+ conf->config = ts_conf;
+
+ return 1;
+}
+
+static void destroy(void *matchinfo, unsigned int matchsize)
+{
+ textsearch_destroy(STRING_TEXT_PRIV(matchinfo)->config);
+}
+
+static struct xt_match string_match = {
+ .name = "string",
+ .match = match,
+ .checkentry = checkentry,
+ .destroy = destroy,
+ .me = THIS_MODULE
+};
+static struct xt_match string6_match = {
+ .name = "string",
+ .match = match,
+ .checkentry = checkentry,
+ .destroy = destroy,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ int ret;
+
+ ret = xt_register_match(AF_INET, &string_match);
+ if (ret)
+ return ret;
+ ret = xt_register_match(AF_INET6, &string6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &string_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET, &string_match);
+ xt_unregister_match(AF_INET6, &string6_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_tcpmss.c b/net/netfilter/xt_tcpmss.c
new file mode 100644
index 0000000..acf7f53
--- /dev/null
+++ b/net/netfilter/xt_tcpmss.c
@@ -0,0 +1,172 @@
+/* Kernel module to match TCP MSS values. */
+
+/* Copyright (C) 2000 Marc Boucher <marc@mbsi.ca>
+ * Portions (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter/xt_tcpmss.h>
+#include <linux/netfilter/x_tables.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+#define TH_SYN 0x02
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("iptables TCP MSS match module");
+MODULE_ALIAS("ipt_tcpmss");
+
+/* Returns 1 if the mss option is set and matched by the range, 0 otherwise */
+static inline int
+mssoption_match(u_int16_t min, u_int16_t max,
+ const struct sk_buff *skb,
+ unsigned int protoff,
+ int invert,
+ int *hotdrop)
+{
+ struct tcphdr _tcph, *th;
+ /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+ u8 _opt[15 * 4 - sizeof(_tcph)], *op;
+ unsigned int i, optlen;
+
+ /* If we don't have the whole header, drop packet. */
+ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ goto dropit;
+
+ /* Malformed. */
+ if (th->doff*4 < sizeof(*th))
+ goto dropit;
+
+ optlen = th->doff*4 - sizeof(*th);
+ if (!optlen)
+ goto out;
+
+ /* Truncated options. */
+ op = skb_header_pointer(skb, protoff + sizeof(*th), optlen, _opt);
+ if (op == NULL)
+ goto dropit;
+
+ for (i = 0; i < optlen; ) {
+ if (op[i] == TCPOPT_MSS
+ && (optlen - i) >= TCPOLEN_MSS
+ && op[i+1] == TCPOLEN_MSS) {
+ u_int16_t mssval;
+
+ mssval = (op[i+2] << 8) | op[i+3];
+
+ return (mssval >= min && mssval <= max) ^ invert;
+ }
+ if (op[i] < 2) i++;
+ else i += op[i+1]?:1;
+ }
+out:
+ return invert;
+
+ dropit:
+ *hotdrop = 1;
+ return 0;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct xt_tcpmss_match_info *info = matchinfo;
+
+ return mssoption_match(info->mss_min, info->mss_max, skb, protoff,
+ info->invert, hotdrop);
+}
+
+static int
+checkentry(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = ipinfo;
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+checkentry6(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ip = ipinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & XT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_match tcpmss_match = {
+ .name = "tcpmss",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match tcpmss6_match = {
+ .name = "tcpmss",
+ .match = &match,
+ .checkentry = &checkentry6,
+ .me = THIS_MODULE,
+};
+
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &tcpmss_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &tcpmss6_match);
+ if (ret)
+ xt_unregister_match(AF_INET, &tcpmss_match);
+
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET6, &tcpmss6_match);
+ xt_unregister_match(AF_INET, &tcpmss_match);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/net/netfilter/xt_tcpudp.c b/net/netfilter/xt_tcpudp.c
new file mode 100644
index 0000000..33f86fd
--- /dev/null
+++ b/net/netfilter/xt_tcpudp.c
@@ -0,0 +1,333 @@
+#include <linux/types.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_tcpudp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_DESCRIPTION("x_tables match for TCP and UDP, supports IPv4 and IPv6");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("xt_tcp");
+MODULE_ALIAS("xt_udp");
+MODULE_ALIAS("ipt_udp");
+MODULE_ALIAS("ipt_tcp");
+MODULE_ALIAS("ip6t_udp");
+MODULE_ALIAS("ip6t_tcp");
+
+#ifdef DEBUG_IP_FIREWALL_USER
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+
+/* Returns 1 if the port is matched by the range, 0 otherwise */
+static inline int
+port_match(u_int16_t min, u_int16_t max, u_int16_t port, int invert)
+{
+ int ret;
+
+ ret = (port >= min && port <= max) ^ invert;
+ return ret;
+}
+
+static int
+tcp_find_option(u_int8_t option,
+ const struct sk_buff *skb,
+ unsigned int protoff,
+ unsigned int optlen,
+ int invert,
+ int *hotdrop)
+{
+ /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+ u_int8_t _opt[60 - sizeof(struct tcphdr)], *op;
+ unsigned int i;
+
+ duprintf("tcp_match: finding option\n");
+
+ if (!optlen)
+ return invert;
+
+ /* If we don't have the whole header, drop packet. */
+ op = skb_header_pointer(skb, protoff + sizeof(struct tcphdr),
+ optlen, _opt);
+ if (op == NULL) {
+ *hotdrop = 1;
+ return 0;
+ }
+
+ for (i = 0; i < optlen; ) {
+ if (op[i] == option) return !invert;
+ if (op[i] < 2) i++;
+ else i += op[i+1]?:1;
+ }
+
+ return invert;
+}
+
+static int
+tcp_match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct tcphdr _tcph, *th;
+ const struct xt_tcp *tcpinfo = matchinfo;
+
+ if (offset) {
+ /* To quote Alan:
+
+ Don't allow a fragment of TCP 8 bytes in. Nobody normal
+ causes this. Its a cracker trying to break in by doing a
+ flag overwrite to pass the direction checks.
+ */
+ if (offset == 1) {
+ duprintf("Dropping evil TCP offset=1 frag.\n");
+ *hotdrop = 1;
+ }
+ /* Must not be a fragment. */
+ return 0;
+ }
+
+#define FWINVTCP(bool,invflg) ((bool) ^ !!(tcpinfo->invflags & invflg))
+
+ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
+ if (th == NULL) {
+ /* We've been asked to examine this packet, and we
+ can't. Hence, no choice but to drop. */
+ duprintf("Dropping evil TCP offset=0 tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ if (!port_match(tcpinfo->spts[0], tcpinfo->spts[1],
+ ntohs(th->source),
+ !!(tcpinfo->invflags & XT_TCP_INV_SRCPT)))
+ return 0;
+ if (!port_match(tcpinfo->dpts[0], tcpinfo->dpts[1],
+ ntohs(th->dest),
+ !!(tcpinfo->invflags & XT_TCP_INV_DSTPT)))
+ return 0;
+ if (!FWINVTCP((((unsigned char *)th)[13] & tcpinfo->flg_mask)
+ == tcpinfo->flg_cmp,
+ XT_TCP_INV_FLAGS))
+ return 0;
+ if (tcpinfo->option) {
+ if (th->doff * 4 < sizeof(_tcph)) {
+ *hotdrop = 1;
+ return 0;
+ }
+ if (!tcp_find_option(tcpinfo->option, skb, protoff,
+ th->doff*4 - sizeof(_tcph),
+ tcpinfo->invflags & XT_TCP_INV_OPTION,
+ hotdrop))
+ return 0;
+ }
+ return 1;
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+tcp_checkentry(const char *tablename,
+ const void *info,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = info;
+ const struct xt_tcp *tcpinfo = matchinfo;
+
+ /* Must specify proto == TCP, and no unknown invflags */
+ return ip->proto == IPPROTO_TCP
+ && !(ip->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_tcp))
+ && !(tcpinfo->invflags & ~XT_TCP_INV_MASK);
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+tcp6_checkentry(const char *tablename,
+ const void *entry,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ipv6 = entry;
+ const struct xt_tcp *tcpinfo = matchinfo;
+
+ /* Must specify proto == TCP, and no unknown invflags */
+ return ipv6->proto == IPPROTO_TCP
+ && !(ipv6->invflags & XT_INV_PROTO)
+ && matchsize == XT_ALIGN(sizeof(struct xt_tcp))
+ && !(tcpinfo->invflags & ~XT_TCP_INV_MASK);
+}
+
+
+static int
+udp_match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct udphdr _udph, *uh;
+ const struct xt_udp *udpinfo = matchinfo;
+
+ /* Must not be a fragment. */
+ if (offset)
+ return 0;
+
+ uh = skb_header_pointer(skb, protoff, sizeof(_udph), &_udph);
+ if (uh == NULL) {
+ /* We've been asked to examine this packet, and we
+ can't. Hence, no choice but to drop. */
+ duprintf("Dropping evil UDP tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ return port_match(udpinfo->spts[0], udpinfo->spts[1],
+ ntohs(uh->source),
+ !!(udpinfo->invflags & XT_UDP_INV_SRCPT))
+ && port_match(udpinfo->dpts[0], udpinfo->dpts[1],
+ ntohs(uh->dest),
+ !!(udpinfo->invflags & XT_UDP_INV_DSTPT));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+udp_checkentry(const char *tablename,
+ const void *info,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = info;
+ const struct xt_udp *udpinfo = matchinfo;
+
+ /* Must specify proto == UDP, and no unknown invflags */
+ if (ip->proto != IPPROTO_UDP || (ip->invflags & XT_INV_PROTO)) {
+ duprintf("ipt_udp: Protocol %u != %u\n", ip->proto,
+ IPPROTO_UDP);
+ return 0;
+ }
+ if (matchinfosize != XT_ALIGN(sizeof(struct xt_udp))) {
+ duprintf("ipt_udp: matchsize %u != %u\n",
+ matchinfosize, XT_ALIGN(sizeof(struct xt_udp)));
+ return 0;
+ }
+ if (udpinfo->invflags & ~XT_UDP_INV_MASK) {
+ duprintf("ipt_udp: unknown flags %X\n",
+ udpinfo->invflags);
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+udp6_checkentry(const char *tablename,
+ const void *entry,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ipv6 = entry;
+ const struct xt_udp *udpinfo = matchinfo;
+
+ /* Must specify proto == UDP, and no unknown invflags */
+ if (ipv6->proto != IPPROTO_UDP || (ipv6->invflags & XT_INV_PROTO)) {
+ duprintf("ip6t_udp: Protocol %u != %u\n", ipv6->proto,
+ IPPROTO_UDP);
+ return 0;
+ }
+ if (matchinfosize != XT_ALIGN(sizeof(struct xt_udp))) {
+ duprintf("ip6t_udp: matchsize %u != %u\n",
+ matchinfosize, XT_ALIGN(sizeof(struct xt_udp)));
+ return 0;
+ }
+ if (udpinfo->invflags & ~XT_UDP_INV_MASK) {
+ duprintf("ip6t_udp: unknown flags %X\n",
+ udpinfo->invflags);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_match tcp_matchstruct = {
+ .name = "tcp",
+ .match = &tcp_match,
+ .checkentry = &tcp_checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match tcp6_matchstruct = {
+ .name = "tcp",
+ .match = &tcp_match,
+ .checkentry = &tcp6_checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match udp_matchstruct = {
+ .name = "udp",
+ .match = &udp_match,
+ .checkentry = &udp_checkentry,
+ .me = THIS_MODULE,
+};
+static struct xt_match udp6_matchstruct = {
+ .name = "udp",
+ .match = &udp_match,
+ .checkentry = &udp6_checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ int ret;
+ ret = xt_register_match(AF_INET, &tcp_matchstruct);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(AF_INET6, &tcp6_matchstruct);
+ if (ret)
+ goto out_unreg_tcp;
+
+ ret = xt_register_match(AF_INET, &udp_matchstruct);
+ if (ret)
+ goto out_unreg_tcp6;
+
+ ret = xt_register_match(AF_INET6, &udp6_matchstruct);
+ if (ret)
+ goto out_unreg_udp;
+
+ return ret;
+
+out_unreg_udp:
+ xt_unregister_match(AF_INET, &tcp_matchstruct);
+out_unreg_tcp6:
+ xt_unregister_match(AF_INET6, &tcp6_matchstruct);
+out_unreg_tcp:
+ xt_unregister_match(AF_INET, &tcp_matchstruct);
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ xt_unregister_match(AF_INET6, &udp6_matchstruct);
+ xt_unregister_match(AF_INET, &udp_matchstruct);
+ xt_unregister_match(AF_INET6, &tcp6_matchstruct);
+ xt_unregister_match(AF_INET, &tcp_matchstruct);
+}
+
+module_init(init);
+module_exit(fini);
