f7108a20de
The function signatures for Xtables extensions have grown over time. It involves a lot of typing/replication, and also a bit of stack space even if they are not used. Realize an NFWS2008 idea and pack them into structs. The skb remains outside of the struct so gcc can continue to apply its optimizations. This patch does this for match extensions' match functions. A few ambiguities have also been addressed. The "offset" parameter for example has been renamed to "fragoff" (there are so many different offsets already) and "protoff" to "thoff" (there is more than just one protocol here, so clarify). Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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, const struct xt_match_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;
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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_IPV4,
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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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