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authorPatrick McHardy <kaber@trash.net>2011-02-03 00:05:43 +0100
committerPatrick McHardy <kaber@trash.net>2011-02-03 00:05:43 +0100
commit9291747f118d6404e509747b85ff5f6dfec368d2 (patch)
tree4ccb3988371f3dc75ade8427518986ad6890389c
parentnetfilter: ipset: send error message manually (diff)
downloadlinux-dev-9291747f118d6404e509747b85ff5f6dfec368d2.tar.xz
linux-dev-9291747f118d6404e509747b85ff5f6dfec368d2.zip
netfilter: xtables: add device group match
Add a new 'devgroup' match to match on the device group of the incoming and outgoing network device of a packet. Signed-off-by: Patrick McHardy <kaber@trash.net>
-rw-r--r--include/linux/netfilter/Kbuild1
-rw-r--r--include/linux/netfilter/xt_devgroup.h21
-rw-r--r--net/netfilter/Kconfig9
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/xt_devgroup.c82
5 files changed, 114 insertions, 0 deletions
diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index ba19544cce94..15e83bf3dd58 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -37,6 +37,7 @@ header-y += xt_connmark.h
header-y += xt_conntrack.h
header-y += xt_cpu.h
header-y += xt_dccp.h
+header-y += xt_devgroup.h
header-y += xt_dscp.h
header-y += xt_esp.h
header-y += xt_hashlimit.h
diff --git a/include/linux/netfilter/xt_devgroup.h b/include/linux/netfilter/xt_devgroup.h
new file mode 100644
index 000000000000..1babde0ec900
--- /dev/null
+++ b/include/linux/netfilter/xt_devgroup.h
@@ -0,0 +1,21 @@
+#ifndef _XT_DEVGROUP_H
+#define _XT_DEVGROUP_H
+
+#include <linux/types.h>
+
+enum xt_devgroup_flags {
+ XT_DEVGROUP_MATCH_SRC = 0x1,
+ XT_DEVGROUP_INVERT_SRC = 0x2,
+ XT_DEVGROUP_MATCH_DST = 0x4,
+ XT_DEVGROUP_INVERT_DST = 0x8,
+};
+
+struct xt_devgroup_info {
+ __u32 flags;
+ __u32 src_group;
+ __u32 src_mask;
+ __u32 dst_group;
+ __u32 dst_mask;
+};
+
+#endif /* _XT_DEVGROUP_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 06fa9e4e45c7..82a6e0d80f05 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -738,6 +738,15 @@ config NETFILTER_XT_MATCH_DCCP
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
+config NETFILTER_XT_MATCH_DEVGROUP
+ tristate '"devgroup" match support'
+ depends on NETFILTER_ADVANCED
+ help
+ This options adds a `devgroup' match, which allows to match on the
+ device group a network device is assigned to.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NETFILTER_XT_MATCH_DSCP
tristate '"dscp" and "tos" match support'
depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 1148643559cb..d57a890eaee5 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -77,6 +77,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_CONNLIMIT) += xt_connlimit.o
obj-$(CONFIG_NETFILTER_XT_MATCH_CONNTRACK) += xt_conntrack.o
obj-$(CONFIG_NETFILTER_XT_MATCH_CPU) += xt_cpu.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DCCP) += xt_dccp.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_DEVGROUP) += xt_devgroup.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o
diff --git a/net/netfilter/xt_devgroup.c b/net/netfilter/xt_devgroup.c
new file mode 100644
index 000000000000..d9202cdd25c9
--- /dev/null
+++ b/net/netfilter/xt_devgroup.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2011 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/netdevice.h>
+
+#include <linux/netfilter/xt_devgroup.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: Device group match");
+MODULE_ALIAS("ipt_devgroup");
+MODULE_ALIAS("ip6t_devgroup");
+
+static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_devgroup_info *info = par->matchinfo;
+
+ if (info->flags & XT_DEVGROUP_MATCH_SRC &&
+ (((info->src_group ^ par->in->group) & info->src_mask ? 1 : 0) ^
+ ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
+ return false;
+
+ if (info->flags & XT_DEVGROUP_MATCH_DST &&
+ (((info->dst_group ^ par->out->group) & info->dst_mask ? 1 : 0) ^
+ ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
+ return false;
+
+ return true;
+}
+
+static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
+{
+ const struct xt_devgroup_info *info = par->matchinfo;
+
+ if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
+ XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
+ return -EINVAL;
+
+ if (info->flags & XT_DEVGROUP_MATCH_SRC &&
+ par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_FORWARD)))
+ return -EINVAL;
+
+ if (info->flags & XT_DEVGROUP_MATCH_DST &&
+ par->hook_mask & ~((1 << NF_INET_FORWARD) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_POST_ROUTING)))
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct xt_match devgroup_mt_reg __read_mostly = {
+ .name = "devgroup",
+ .match = devgroup_mt,
+ .checkentry = devgroup_mt_checkentry,
+ .matchsize = sizeof(struct xt_devgroup_info),
+ .family = NFPROTO_UNSPEC,
+ .me = THIS_MODULE
+};
+
+static int __init devgroup_mt_init(void)
+{
+ return xt_register_match(&devgroup_mt_reg);
+}
+
+static void __exit devgroup_mt_exit(void)
+{
+ xt_unregister_match(&devgroup_mt_reg);
+}
+
+module_init(devgroup_mt_init);
+module_exit(devgroup_mt_exit);