0660e03f6b
Now the skb->nh union has just one member, .raw, i.e. it is just like the
skb->mac union, strange, no? I'm just leaving it like that till the transport
layer is done with, when we'll rename skb->mac.raw to skb->mac_header (or
->mac_header_offset?), ditto for ->{h,nh}.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* Hop Limit matching module */
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/* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
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* Based on HW's ttl module
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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/ipv6.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter_ipv6/ip6t_hl.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
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MODULE_DESCRIPTION("IP tables Hop Limit matching module");
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MODULE_LICENSE("GPL");
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static int match(const struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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const struct xt_match *match, const void *matchinfo,
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int offset, unsigned int protoff, int *hotdrop)
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{
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const struct ip6t_hl_info *info = matchinfo;
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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switch (info->mode) {
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case IP6T_HL_EQ:
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return (ip6h->hop_limit == info->hop_limit);
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break;
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case IP6T_HL_NE:
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return (!(ip6h->hop_limit == info->hop_limit));
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break;
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case IP6T_HL_LT:
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return (ip6h->hop_limit < info->hop_limit);
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break;
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case IP6T_HL_GT:
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return (ip6h->hop_limit > info->hop_limit);
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break;
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default:
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printk(KERN_WARNING "ip6t_hl: unknown mode %d\n",
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info->mode);
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return 0;
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}
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return 0;
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}
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static struct xt_match hl_match = {
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.name = "hl",
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.family = AF_INET6,
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.match = match,
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.matchsize = sizeof(struct ip6t_hl_info),
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.me = THIS_MODULE,
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};
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static int __init ip6t_hl_init(void)
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{
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return xt_register_match(&hl_match);
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}
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static void __exit ip6t_hl_fini(void)
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{
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xt_unregister_match(&hl_match);
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}
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module_init(ip6t_hl_init);
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module_exit(ip6t_hl_fini);
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