/* 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 boolphysdev_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);