mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 18:09:05 +00:00
1d5cd90976
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* iptables module to match IP address ranges
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*
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* (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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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/ip.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ipt_iprange.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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MODULE_DESCRIPTION("iptables arbitrary IP range match module");
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset, unsigned int protoff, int *hotdrop)
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{
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const struct ipt_iprange_info *info = matchinfo;
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const struct iphdr *iph = skb->nh.iph;
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if (info->flags & IPRANGE_SRC) {
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if (((ntohl(iph->saddr) < ntohl(info->src.min_ip))
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|| (ntohl(iph->saddr) > ntohl(info->src.max_ip)))
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^ !!(info->flags & IPRANGE_SRC_INV)) {
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DEBUGP("src IP %u.%u.%u.%u NOT in range %s"
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"%u.%u.%u.%u-%u.%u.%u.%u\n",
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NIPQUAD(iph->saddr),
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info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
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NIPQUAD(info->src.min_ip),
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NIPQUAD(info->src.max_ip));
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return 0;
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}
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}
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if (info->flags & IPRANGE_DST) {
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if (((ntohl(iph->daddr) < ntohl(info->dst.min_ip))
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|| (ntohl(iph->daddr) > ntohl(info->dst.max_ip)))
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^ !!(info->flags & IPRANGE_DST_INV)) {
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DEBUGP("dst IP %u.%u.%u.%u NOT in range %s"
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"%u.%u.%u.%u-%u.%u.%u.%u\n",
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NIPQUAD(iph->daddr),
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info->flags & IPRANGE_DST_INV ? "(INV) " : "",
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NIPQUAD(info->dst.min_ip),
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NIPQUAD(info->dst.max_ip));
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return 0;
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}
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}
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return 1;
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}
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static struct ipt_match iprange_match = {
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.name = "iprange",
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.match = match,
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.matchsize = sizeof(struct ipt_iprange_info),
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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(&iprange_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(&iprange_match);
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}
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module_init(init);
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module_exit(fini);
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