[NETFILTER]: merge ipt_owner/ip6t_owner in xt_owner

xt_owner merges ipt_owner and ip6t_owner, and adds a flag to match
on socket (non-)existence.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

11 files changed, 237 insertions, 194 deletions

diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index b87e83a5e07..1e690027831 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -26,6 +26,7 @@ header-y += xt_limit.h
 header-y += xt_mac.h
 header-y += xt_mark.h
 header-y += xt_multiport.h
+header-y += xt_owner.h
 header-y += xt_pkttype.h
 header-y += xt_policy.h
 header-y += xt_realm.h
diff --git a/include/linux/netfilter/xt_owner.h b/include/linux/netfilter/xt_owner.h
new file mode 100644
index 00000000000..eacd34efebd
--- /dev/null
+++ b/include/linux/netfilter/xt_owner.h
@@ -0,0 +1,16 @@
+#ifndef _XT_OWNER_MATCH_H
+#define _XT_OWNER_MATCH_H
+
+enum {
+	XT_OWNER_UID    = 1 << 0,
+	XT_OWNER_GID    = 1 << 1,
+	XT_OWNER_SOCKET = 1 << 2,
+};
+
+struct xt_owner_match_info {
+	u_int32_t uid;
+	u_int32_t gid;
+	u_int8_t match, invert;
+};
+
+#endif /* _XT_OWNER_MATCH_H */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 9aca9c55687..6c563d908c7 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -111,15 +111,6 @@ config IP_NF_MATCH_TTL
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP_NF_MATCH_OWNER
-	tristate "Owner match support"
-	depends on IP_NF_IPTABLES
-	help
-	  Packet owner matching allows you to match locally-generated packets
-	  based on who created them: the user, group, process or session.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP_NF_MATCH_ADDRTYPE
 	tristate  'address type match support'
 	depends on IP_NF_IPTABLES
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 7456833d6ad..42199e93b86 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -45,7 +45,6 @@ obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
 obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
 obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o
-obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
 obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
 obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
diff --git a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
deleted file mode 100644
index 4f1aa897d4b..00000000000
--- a/net/ipv4/netfilter/ipt_owner.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Kernel module to match various things tied to sockets associated with
-   locally generated outgoing packets. */
-
-/* (C) 2000 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/file.h>
-#include <linux/rcupdate.h>
-#include <net/sock.h>
-
-#include <linux/netfilter_ipv4/ipt_owner.h>
-#include <linux/netfilter/x_tables.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
-MODULE_DESCRIPTION("iptables owner match");
-
-static bool
-owner_mt(const struct sk_buff *skb, const struct net_device *in,
-         const struct net_device *out, const struct xt_match *match,
-         const void *matchinfo, int offset, unsigned int protoff,
-         bool *hotdrop)
-{
-	const struct ipt_owner_info *info = matchinfo;
-
-	if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
-		return false;
-
-	if(info->match & IPT_OWNER_UID) {
-		if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
-		    !!(info->invert & IPT_OWNER_UID))
-			return false;
-	}
-
-	if(info->match & IPT_OWNER_GID) {
-		if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
-		    !!(info->invert & IPT_OWNER_GID))
-			return false;
-	}
-
-	return true;
-}
-
-static bool
-owner_mt_check(const char *tablename, const void *ip,
-               const struct xt_match *match, void *matchinfo,
-               unsigned int hook_mask)
-{
-	const struct ipt_owner_info *info = matchinfo;
-
-	if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) {
-		printk("ipt_owner: pid, sid and command matching "
-		       "not supported anymore\n");
-		return false;
-	}
-	return true;
-}
-
-static struct xt_match owner_mt_reg __read_mostly = {
-	.name		= "owner",
-	.family		= AF_INET,
-	.match		= owner_mt,
-	.matchsize	= sizeof(struct ipt_owner_info),
-	.hooks		= (1 << NF_INET_LOCAL_OUT) |
-			  (1 << NF_INET_POST_ROUTING),
-	.checkentry	= owner_mt_check,
-	.me		= THIS_MODULE,
-};
-
-static int __init owner_mt_init(void)
-{
-	return xt_register_match(&owner_mt_reg);
-}
-
-static void __exit owner_mt_exit(void)
-{
-	xt_unregister_match(&owner_mt_reg);
-}
-
-module_init(owner_mt_init);
-module_exit(owner_mt_exit);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 838b8ddee8c..30d48529d98 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -89,15 +89,6 @@ config IP6_NF_MATCH_HL
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP6_NF_MATCH_OWNER
-	tristate "Owner match support"
-	depends on IP6_NF_IPTABLES
-	help
-	  Packet owner matching allows you to match locally-generated packets
-	  based on who created them: the user, group, process or session.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP6_NF_MATCH_IPV6HEADER
 	tristate "IPv6 Extension Headers Match"
 	depends on IP6_NF_IPTABLES
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index e789ec44d23..fbf2c14ed88 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -23,7 +23,6 @@ obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
 obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
 obj-$(CONFIG_IP6_NF_MATCH_MH) += ip6t_mh.o
 obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o
-obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o
 obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
 
 # targets
diff --git a/net/ipv6/netfilter/ip6t_owner.c b/net/ipv6/netfilter/ip6t_owner.c
deleted file mode 100644
index 6a52ed98516..00000000000
--- a/net/ipv6/netfilter/ip6t_owner.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Kernel module to match various things tied to sockets associated with
-   locally generated outgoing packets. */
-
-/* (C) 2000-2001 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/file.h>
-#include <linux/rcupdate.h>
-#include <net/sock.h>
-
-#include <linux/netfilter_ipv6/ip6t_owner.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <linux/netfilter/x_tables.h>
-
-MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
-MODULE_DESCRIPTION("IP6 tables owner matching module");
-MODULE_LICENSE("GPL");
-
-
-static bool
-owner_mt6(const struct sk_buff *skb, const struct net_device *in,
-          const struct net_device *out, const struct xt_match *match,
-          const void *matchinfo, int offset, unsigned int protoff,
-          bool *hotdrop)
-{
-	const struct ip6t_owner_info *info = matchinfo;
-
-	if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
-		return false;
-
-	if (info->match & IP6T_OWNER_UID)
-		if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
-		    !!(info->invert & IP6T_OWNER_UID))
-			return false;
-
-	if (info->match & IP6T_OWNER_GID)
-		if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
-		    !!(info->invert & IP6T_OWNER_GID))
-			return false;
-
-	return true;
-}
-
-static bool
-owner_mt6_check(const char *tablename, const void *ip,
-                const struct xt_match *match, void *matchinfo,
-                unsigned int hook_mask)
-{
-	const struct ip6t_owner_info *info = matchinfo;
-
-	if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) {
-		printk("ipt_owner: pid and sid matching "
-		       "not supported anymore\n");
-		return false;
-	}
-	return true;
-}
-
-static struct xt_match owner_mt6_reg __read_mostly = {
-	.name		= "owner",
-	.family		= AF_INET6,
-	.match		= owner_mt6,
-	.matchsize	= sizeof(struct ip6t_owner_info),
-	.hooks		= (1 << NF_INET_LOCAL_OUT) |
-			  (1 << NF_INET_POST_ROUTING),
-	.checkentry	= owner_mt6_check,
-	.me		= THIS_MODULE,
-};
-
-static int __init owner_mt6_init(void)
-{
-	return xt_register_match(&owner_mt6_reg);
-}
-
-static void __exit owner_mt6_exit(void)
-{
-	xt_unregister_match(&owner_mt6_reg);
-}
-
-module_init(owner_mt6_init);
-module_exit(owner_mt6_exit);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 693f861a03b..4bc0552b75f 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -554,6 +554,14 @@ config NETFILTER_XT_MATCH_MARK
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NETFILTER_XT_MATCH_OWNER
+	tristate '"owner" match support'
+	depends on NETFILTER_XTABLES
+	---help---
+	Socket owner matching allows you to match locally-generated packets
+	based on who created the socket: the user or group. It is also
+	possible to check whether a socket actually exists.
+
 config NETFILTER_XT_MATCH_POLICY
 	tristate 'IPsec "policy" match support'
 	depends on NETFILTER_XTABLES && XFRM
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 7763dea17be..28f59a35aee 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -67,6 +67,7 @@ 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_MULTIPORT) += xt_multiport.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_OWNER) += xt_owner.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c
new file mode 100644
index 00000000000..4222fa2c1b1
--- /dev/null
+++ b/net/netfilter/xt_owner.c
@@ -0,0 +1,211 @@
+/*
+ * Kernel module to match various things tied to sockets associated with
+ * locally generated outgoing packets.
+ *
+ * (C) 2000 Marc Boucher <marc@mbsi.ca>
+ *
+ * Copyright © CC Computer Consultants GmbH, 2007
+ * Contact: <jengelh@computergmbh.de>
+ *
+ * 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/file.h>
+#include <net/sock.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_owner.h>
+#include <linux/netfilter_ipv4/ipt_owner.h>
+#include <linux/netfilter_ipv6/ip6t_owner.h>
+
+static bool
+owner_mt_v0(const struct sk_buff *skb, const struct net_device *in,
+            const struct net_device *out, const struct xt_match *match,
+            const void *matchinfo, int offset, unsigned int protoff,
+            bool *hotdrop)
+{
+	const struct ipt_owner_info *info = matchinfo;
+	const struct file *filp;
+
+	if (skb->sk == NULL || skb->sk->sk_socket == NULL)
+		return false;
+
+	filp = skb->sk->sk_socket->file;
+	if (filp == NULL)
+		return false;
+
+	if (info->match & IPT_OWNER_UID)
+		if ((filp->f_uid != info->uid) ^
+		    !!(info->invert & IPT_OWNER_UID))
+			return false;
+
+	if (info->match & IPT_OWNER_GID)
+		if ((filp->f_gid != info->gid) ^
+		    !!(info->invert & IPT_OWNER_GID))
+			return false;
+
+	return true;
+}
+
+static bool
+owner_mt6_v0(const struct sk_buff *skb, const struct net_device *in,
+             const struct net_device *out, const struct xt_match *match,
+             const void *matchinfo, int offset, unsigned int protoff,
+             bool *hotdrop)
+{
+	const struct ip6t_owner_info *info = matchinfo;
+	const struct file *filp;
+
+	if (skb->sk == NULL || skb->sk->sk_socket == NULL)
+		return false;
+
+	filp = skb->sk->sk_socket->file;
+	if (filp == NULL)
+		return false;
+
+	if (info->match & IP6T_OWNER_UID)
+		if ((filp->f_uid != info->uid) ^
+		    !!(info->invert & IP6T_OWNER_UID))
+			return false;
+
+	if (info->match & IP6T_OWNER_GID)
+		if ((filp->f_gid != info->gid) ^
+		    !!(info->invert & IP6T_OWNER_GID))
+			return false;
+
+	return true;
+}
+
+static bool
+owner_mt(const struct sk_buff *skb, const struct net_device *in,
+         const struct net_device *out, const struct xt_match *match,
+         const void *matchinfo, int offset, unsigned int protoff,
+         bool *hotdrop)
+{
+	const struct xt_owner_match_info *info = matchinfo;
+	const struct file *filp;
+
+	if (skb->sk == NULL || skb->sk->sk_socket == NULL)
+		return (info->match ^ info->invert) == 0;
+	else if (info->match & info->invert & XT_OWNER_SOCKET)
+		/*
+		 * Socket exists but user wanted ! --socket-exists.
+		 * (Single ampersands intended.)
+		 */
+		return false;
+
+	filp = skb->sk->sk_socket->file;
+	if (filp == NULL)
+		return ((info->match ^ info->invert) &
+		       (XT_OWNER_UID | XT_OWNER_GID)) == 0;
+
+	if (info->match & XT_OWNER_UID)
+		if ((filp->f_uid != info->uid) ^
+		    !!(info->invert & XT_OWNER_UID))
+			return false;
+
+	if (info->match & XT_OWNER_GID)
+		if ((filp->f_gid != info->gid) ^
+		    !!(info->invert & XT_OWNER_GID))
+			return false;
+
+	return true;
+}
+
+static bool
+owner_mt_check_v0(const char *tablename, const void *ip,
+                  const struct xt_match *match, void *matchinfo,
+                  unsigned int hook_mask)
+{
+	const struct ipt_owner_info *info = matchinfo;
+
+	if (info->match & (IPT_OWNER_PID | IPT_OWNER_SID | IPT_OWNER_COMM)) {
+		printk(KERN_WARNING KBUILD_MODNAME
+		       ": PID, SID and command matching is not "
+		       "supported anymore\n");
+		return false;
+	}
+
+	return true;
+}
+
+static bool
+owner_mt6_check_v0(const char *tablename, const void *ip,
+                   const struct xt_match *match, void *matchinfo,
+                   unsigned int hook_mask)
+{
+	const struct ip6t_owner_info *info = matchinfo;
+
+	if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) {
+		printk(KERN_WARNING KBUILD_MODNAME
+		       ": PID and SID matching is not supported anymore\n");
+		return false;
+	}
+
+	return true;
+}
+
+static struct xt_match owner_mt_reg[] __read_mostly = {
+	{
+		.name       = "owner",
+		.revision   = 0,
+		.family     = AF_INET,
+		.match      = owner_mt_v0,
+		.matchsize  = sizeof(struct ipt_owner_info),
+		.checkentry = owner_mt_check_v0,
+		.hooks      = (1 << NF_INET_LOCAL_OUT) |
+		              (1 << NF_INET_POST_ROUTING),
+		.me         = THIS_MODULE,
+	},
+	{
+		.name       = "owner",
+		.revision   = 0,
+		.family     = AF_INET6,
+		.match      = owner_mt6_v0,
+		.matchsize  = sizeof(struct ip6t_owner_info),
+		.checkentry = owner_mt6_check_v0,
+		.hooks      = (1 << NF_INET_LOCAL_OUT) |
+		              (1 << NF_INET_POST_ROUTING),
+		.me         = THIS_MODULE,
+	},
+	{
+		.name       = "owner",
+		.revision   = 1,
+		.family     = AF_INET,
+		.match      = owner_mt,
+		.matchsize  = sizeof(struct xt_owner_match_info),
+		.hooks      = (1 << NF_INET_LOCAL_OUT) |
+		              (1 << NF_INET_POST_ROUTING),
+		.me         = THIS_MODULE,
+	},
+	{
+		.name       = "owner",
+		.revision   = 1,
+		.family     = AF_INET6,
+		.match      = owner_mt,
+		.matchsize  = sizeof(struct xt_owner_match_info),
+		.hooks      = (1 << NF_INET_LOCAL_OUT) |
+		              (1 << NF_INET_POST_ROUTING),
+		.me         = THIS_MODULE,
+	},
+};
+
+static int __init owner_mt_init(void)
+{
+	return xt_register_matches(owner_mt_reg, ARRAY_SIZE(owner_mt_reg));
+}
+
+static void __exit owner_mt_exit(void)
+{
+	xt_unregister_matches(owner_mt_reg, ARRAY_SIZE(owner_mt_reg));
+}
+
+module_init(owner_mt_init);
+module_exit(owner_mt_exit);
+MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>");
+MODULE_DESCRIPTION("netfilter \"owner\" match module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_owner");
+MODULE_ALIAS("ip6t_owner");