![Jan Engelhardt](/assets/img/avatar_default.png)
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>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* Kernel module to match MAC address parameters. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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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/if_ether.h>
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#include <linux/etherdevice.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter/xt_mac.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("Xtables: MAC address match");
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MODULE_ALIAS("ipt_mac");
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MODULE_ALIAS("ip6t_mac");
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static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par)
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{
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const struct xt_mac_info *info = par->matchinfo;
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/* Is mac pointer valid? */
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return skb_mac_header(skb) >= skb->head &&
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skb_mac_header(skb) + ETH_HLEN <= skb->data
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/* If so, compare... */
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&& ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
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^ info->invert);
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}
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static struct xt_match mac_mt_reg[] __read_mostly = {
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{
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.name = "mac",
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.family = NFPROTO_IPV4,
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.match = mac_mt,
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.matchsize = sizeof(struct xt_mac_info),
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD),
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.me = THIS_MODULE,
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},
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{
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.name = "mac",
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.family = NFPROTO_IPV6,
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.match = mac_mt,
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.matchsize = sizeof(struct xt_mac_info),
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.hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD),
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.me = THIS_MODULE,
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},
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};
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static int __init mac_mt_init(void)
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{
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return xt_register_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
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}
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static void __exit mac_mt_exit(void)
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{
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xt_unregister_matches(mac_mt_reg, ARRAY_SIZE(mac_mt_reg));
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}
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module_init(mac_mt_init);
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module_exit(mac_mt_exit);
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