commit 7f1764fa749032eb8566226bbd1c5a58a8a5efc6
Author: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
Date: Wed Jan 16 18:58:49 2008 +0100
[NETFILTER]: xt_conntrack: add port and direction matching
Extend the xt_conntrack match revision 1 by port matching (all four
{orig,repl}{src,dst}) and by packet direction matching.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
diff --git a/include/linux/netfilter/xt_conntrack.h b/include/linux/netfilter/xt_conntrack.h
index d2492a3..f3fd83e 100644
--- a/include/linux/netfilter/xt_conntrack.h
+++ b/include/linux/netfilter/xt_conntrack.h
@@ -6,9 +6,6 @@
#define _XT_CONNTRACK_H
#include <linux/netfilter/nf_conntrack_tuple_common.h>
-#ifdef __KERNEL__
-# include <linux/in.h>
-#endif
#define XT_CONNTRACK_STATE_BIT(ctinfo) (1 << ((ctinfo)%IP_CT_IS_REPLY+1))
#define XT_CONNTRACK_STATE_INVALID (1 << 0)
@@ -18,14 +15,21 @@
#define XT_CONNTRACK_STATE_UNTRACKED (1 << (IP_CT_NUMBER + 3))
/* flags, invflags: */
-#define XT_CONNTRACK_STATE 0x01
-#define XT_CONNTRACK_PROTO 0x02
-#define XT_CONNTRACK_ORIGSRC 0x04
-#define XT_CONNTRACK_ORIGDST 0x08
-#define XT_CONNTRACK_REPLSRC 0x10
-#define XT_CONNTRACK_REPLDST 0x20
-#define XT_CONNTRACK_STATUS 0x40
-#define XT_CONNTRACK_EXPIRES 0x80
+enum {
+ XT_CONNTRACK_STATE = 1 << 0,
+ XT_CONNTRACK_PROTO = 1 << 1,
+ XT_CONNTRACK_ORIGSRC = 1 << 2,
+ XT_CONNTRACK_ORIGDST = 1 << 3,
+ XT_CONNTRACK_REPLSRC = 1 << 4,
+ XT_CONNTRACK_REPLDST = 1 << 5,
+ XT_CONNTRACK_STATUS = 1 << 6,
+ XT_CONNTRACK_EXPIRES = 1 << 7,
+ XT_CONNTRACK_ORIGSRC_PORT = 1 << 8,
+ XT_CONNTRACK_ORIGDST_PORT = 1 << 9,
+ XT_CONNTRACK_REPLSRC_PORT = 1 << 10,
+ XT_CONNTRACK_REPLDST_PORT = 1 << 11,
+ XT_CONNTRACK_DIRECTION = 1 << 12,
+};
/* This is exposed to userspace, so remains frozen in time. */
struct ip_conntrack_old_tuple
@@ -70,8 +74,10 @@ struct xt_conntrack_mtinfo1 {
union nf_inet_addr repldst_addr, repldst_mask;
u_int32_t expires_min, expires_max;
u_int16_t l4proto;
+ __be16 origsrc_port, origdst_port;
+ __be16 replsrc_port, repldst_port;
+ u_int16_t match_flags, invert_flags;
u_int8_t state_mask, status_mask;
- u_int8_t match_flags, invert_flags;
};
#endif /*_XT_CONNTRACK_H*/
diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c
index e92190e..8533085 100644
--- a/net/netfilter/xt_conntrack.c
+++ b/net/netfilter/xt_conntrack.c
@@ -4,7 +4,6 @@
*
* (C) 2001 Marc Boucher (marc@xxxxxxx).
* Copyright © CC Computer Consultants GmbH, 2007 - 2008
- * Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>
*
* 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
@@ -20,6 +19,7 @@
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@xxxxxxx>");
+MODULE_AUTHOR("Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Xtables: connection tracking state match");
MODULE_ALIAS("ipt_conntrack");
MODULE_ALIAS("ip6t_conntrack");
@@ -166,6 +166,44 @@ conntrack_mt_repldst(const struct nf_conn *ct,
&info->repldst_addr, &info->repldst_mask, family);
}
+static inline bool
+ct_proto_port_check(const struct xt_conntrack_mtinfo1 *info,
+ const struct nf_conn *ct)
+{
+ const struct nf_conntrack_tuple *tuple;
+
+ tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ if ((info->match_flags & XT_CONNTRACK_PROTO) &&
+ (tuple->dst.protonum == info->l4proto) ^
+ !(info->invert_flags & XT_CONNTRACK_PROTO))
+ return false;
+
+ /* Shortcut to match all recognized protocols by using ->src.all. */
+ if ((info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) &&
+ (tuple->src.u.all == info->origsrc_port) ^
+ !(info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT))
+ return false;
+
+ if ((info->match_flags & XT_CONNTRACK_ORIGDST_PORT) &&
+ (tuple->dst.u.all == info->origdst_port) ^
+ !(info->invert_flags & XT_CONNTRACK_ORIGDST_PORT))
+ return false;
+
+ tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+
+ if ((info->match_flags & XT_CONNTRACK_REPLSRC_PORT) &&
+ (tuple->src.u.all == info->replsrc_port) ^
+ !(info->invert_flags & XT_CONNTRACK_REPLSRC_PORT))
+ return false;
+
+ if ((info->match_flags & XT_CONNTRACK_REPLDST_PORT) &&
+ (tuple->dst.u.all == info->repldst_port) ^
+ !(info->invert_flags & XT_CONNTRACK_REPLDST_PORT))
+ return false;
+
+ return true;
+}
+
static bool
conntrack_mt(const struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, const struct xt_match *match,
@@ -200,10 +238,9 @@ conntrack_mt(const struct sk_buff *skb, const struct net_device *in,
if (ct == NULL)
return info->match_flags & XT_CONNTRACK_STATE;
-
- if ((info->match_flags & XT_CONNTRACK_PROTO) &&
- ((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
- info->l4proto) ^ !(info->invert_flags & XT_CONNTRACK_PROTO)))
+ if ((info->match_flags & XT_CONNTRACK_DIRECTION) &&
+ (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^
+ !!(info->invert_flags & XT_CONNTRACK_DIRECTION))
return false;
if (info->match_flags & XT_CONNTRACK_ORIGSRC)
@@ -226,6 +263,9 @@ conntrack_mt(const struct sk_buff *skb, const struct net_device *in,
!(info->invert_flags & XT_CONNTRACK_REPLDST))
return false;
+ if (!ct_proto_port_check(info, ct))
+ return false;
+
if ((info->match_flags & XT_CONNTRACK_STATUS) &&
(!!(info->status_mask & ct->status) ^
!(info->invert_flags & XT_CONNTRACK_STATUS)))
-
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