[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 <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 693f861a..4bc0552 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -554,6 +554,14 @@
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 7763dea..28f59a35 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -67,6 +67,7 @@
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 0000000..4222fa2
--- /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 <[email protected]>
+ *
+ * Copyright © CC Computer Consultants GmbH, 2007
+ * Contact: <[email protected]>
+ *
+ * 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 <[email protected]>");
+MODULE_DESCRIPTION("netfilter \"owner\" match module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_owner");
+MODULE_ALIAS("ip6t_owner");
