// SPDX-License-Identifier: GPL-2.0-only
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/* IP tables module for matching the routing realm
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*
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* (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <net/route.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/xt_realm.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Xtables: Routing realm match");
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MODULE_ALIAS("ipt_realm");
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static bool
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realm_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_realm_info *info = par->matchinfo;
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const struct dst_entry *dst = skb_dst(skb);
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return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
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}
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static struct xt_match realm_mt_reg __read_mostly = {
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.name = "realm",
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.match = realm_mt,
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.matchsize = sizeof(struct xt_realm_info),
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.hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_FORWARD) |
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(1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN),
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.family = NFPROTO_UNSPEC,
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.me = THIS_MODULE
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};
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static int __init realm_mt_init(void)
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{
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return xt_register_match(&realm_mt_reg);
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}
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static void __exit realm_mt_exit(void)
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{
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xt_unregister_match(&realm_mt_reg);
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}
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module_init(realm_mt_init);
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module_exit(realm_mt_exit);
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