Initial import

1 files changed, 140 insertions, 0 deletions

diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
new file mode 100644
index 000000000..1caaccbc3
--- /dev/null
+++ b/net/netfilter/xt_physdev.c
@@ -0,0 +1,140 @@
+/* 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.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/netfilter/xt_physdev.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/netfilter/br_netfilter.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
+MODULE_DESCRIPTION("Xtables: Bridge physical device match");
+MODULE_ALIAS("ipt_physdev");
+MODULE_ALIAS("ip6t_physdev");
+
+
+static bool
+physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	const struct xt_physdev_info *info = par->matchinfo;
+	const struct net_device *physdev;
+	unsigned long ret;
+	const char *indev, *outdev;
+
+	/* 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 (!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 false;
+		if ((info->bitmask & XT_PHYSDEV_OP_ISIN) &&
+		    !(info->invert & XT_PHYSDEV_OP_ISIN))
+			return false;
+		if ((info->bitmask & XT_PHYSDEV_OP_ISOUT) &&
+		    !(info->invert & XT_PHYSDEV_OP_ISOUT))
+			return false;
+		if ((info->bitmask & XT_PHYSDEV_OP_IN) &&
+		    !(info->invert & XT_PHYSDEV_OP_IN))
+			return false;
+		if ((info->bitmask & XT_PHYSDEV_OP_OUT) &&
+		    !(info->invert & XT_PHYSDEV_OP_OUT))
+			return false;
+		return true;
+	}
+
+	physdev = nf_bridge_get_physoutdev(skb);
+	outdev = physdev ? physdev->name : NULL;
+
+	/* This only makes sense in the FORWARD and POSTROUTING chains */
+	if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
+	    (!!outdev ^ !(info->invert & XT_PHYSDEV_OP_BRIDGED)))
+		return false;
+
+	physdev = nf_bridge_get_physindev(skb);
+	indev = physdev ? physdev->name : NULL;
+
+	if ((info->bitmask & XT_PHYSDEV_OP_ISIN &&
+	    (!indev ^ !!(info->invert & XT_PHYSDEV_OP_ISIN))) ||
+	    (info->bitmask & XT_PHYSDEV_OP_ISOUT &&
+	    (!outdev ^ !!(info->invert & XT_PHYSDEV_OP_ISOUT))))
+		return false;
+
+	if (!(info->bitmask & XT_PHYSDEV_OP_IN))
+		goto match_outdev;
+
+	if (indev) {
+		ret = ifname_compare_aligned(indev, info->physindev,
+					     info->in_mask);
+
+		if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN))
+			return false;
+	}
+
+match_outdev:
+	if (!(info->bitmask & XT_PHYSDEV_OP_OUT))
+		return true;
+
+	if (!outdev)
+		return false;
+
+	ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask);
+
+	return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT));
+}
+
+static int physdev_mt_check(const struct xt_mtchk_param *par)
+{
+	const struct xt_physdev_info *info = par->matchinfo;
+
+	br_netfilter_enable();
+
+	if (!(info->bitmask & XT_PHYSDEV_OP_MASK) ||
+	    info->bitmask & ~XT_PHYSDEV_OP_MASK)
+		return -EINVAL;
+	if (info->bitmask & XT_PHYSDEV_OP_OUT &&
+	    (!(info->bitmask & XT_PHYSDEV_OP_BRIDGED) ||
+	     info->invert & XT_PHYSDEV_OP_BRIDGED) &&
+	    par->hook_mask & ((1 << NF_INET_LOCAL_OUT) |
+	    (1 << NF_INET_FORWARD) | (1 << NF_INET_POST_ROUTING))) {
+		pr_info("using --physdev-out in the OUTPUT, FORWARD and "
+			"POSTROUTING chains for non-bridged traffic is not "
+			"supported anymore.\n");
+		if (par->hook_mask & (1 << NF_INET_LOCAL_OUT))
+			return -EINVAL;
+	}
+	return 0;
+}
+
+static struct xt_match physdev_mt_reg __read_mostly = {
+	.name       = "physdev",
+	.revision   = 0,
+	.family     = NFPROTO_UNSPEC,
+	.checkentry = physdev_mt_check,
+	.match      = physdev_mt,
+	.matchsize  = sizeof(struct xt_physdev_info),
+	.me         = THIS_MODULE,
+};
+
+static int __init physdev_mt_init(void)
+{
+	return xt_register_match(&physdev_mt_reg);
+}
+
+static void __exit physdev_mt_exit(void)
+{
+	xt_unregister_match(&physdev_mt_reg);
+}
+
+module_init(physdev_mt_init);
+module_exit(physdev_mt_exit);