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>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* (C) 1999-2001 Michal Ludvig <michal@logix.cz>
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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/if_packet.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/netfilter/xt_pkttype.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michal Ludvig <michal@logix.cz>");
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MODULE_DESCRIPTION("Xtables: link layer packet type match");
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MODULE_ALIAS("ipt_pkttype");
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MODULE_ALIAS("ip6t_pkttype");
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static bool
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pkttype_mt(const struct sk_buff *skb, const struct xt_match_param *par)
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{
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const struct xt_pkttype_info *info = par->matchinfo;
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u_int8_t type;
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if (skb->pkt_type != PACKET_LOOPBACK)
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type = skb->pkt_type;
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else if (par->match->family == NFPROTO_IPV4 &&
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ipv4_is_multicast(ip_hdr(skb)->daddr))
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type = PACKET_MULTICAST;
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else if (par->match->family == NFPROTO_IPV6 &&
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ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
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type = PACKET_MULTICAST;
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else
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type = PACKET_BROADCAST;
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return (type == info->pkttype) ^ info->invert;
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}
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static struct xt_match pkttype_mt_reg[] __read_mostly = {
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{
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.name = "pkttype",
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.family = NFPROTO_IPV4,
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.match = pkttype_mt,
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.matchsize = sizeof(struct xt_pkttype_info),
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.me = THIS_MODULE,
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},
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{
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.name = "pkttype",
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.family = NFPROTO_IPV6,
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.match = pkttype_mt,
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.matchsize = sizeof(struct xt_pkttype_info),
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.me = THIS_MODULE,
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},
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};
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static int __init pkttype_mt_init(void)
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{
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return xt_register_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
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}
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static void __exit pkttype_mt_exit(void)
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{
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xt_unregister_matches(pkttype_mt_reg, ARRAY_SIZE(pkttype_mt_reg));
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}
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module_init(pkttype_mt_init);
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module_exit(pkttype_mt_exit);
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