55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
#include <linux/module.h>
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#include <linux/sk_buff.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_workshop.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("OLS2003 workshop iptables module");
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static int ws_match(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const void *matchinfo,
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int offset, const void *hdr, u_int16_t datalen,
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int *hotdrop)
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{
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const struct ipt_ws_info *info = matchinfo;
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const struct iphdr *iph = skb->nh.iph;
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if (iph->ttl == info->ttl)
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return 1;
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return 0;
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}
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static int ws_checkentry(const char *tablename, const struct ipt_ip *ip,
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void *matchinfo, unsigned int matchsize,
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unsigned int hook_mask)
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{
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if (matchsize != IPT_ALIGN(sizeof(struct ipt_ws_info)))
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return 0;
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return 1;
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}
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static struct ipt_match ws_match = {
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.list = { .prev = NULL, .next = NULL },
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.name = "workshop",
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.match = &ws_match,
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.checkentry = &ws_checkentry,
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.destroy = NULL,
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.me = THIS_MODULE
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};
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static int __init init(void)
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{
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return ipt_register_match(&ws_match);
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}
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static void __exit fini(void)
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{
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ipt_unregister_match(&ws_match);
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}
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module_init(init);
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module_exit(fini);
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