![Jan Engelhardt](/assets/img/avatar_default.png)
This patch moves ipt_iprange to xt_iprange, in preparation for adding IPv6 support to xt_iprange. Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* xt_iprange - Netfilter 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/x_tables.h>
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#include <linux/netfilter_ipv4/ipt_iprange.h>
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static bool
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iprange_mt_v0(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct ipt_iprange_info *info = matchinfo;
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const struct iphdr *iph = ip_hdr(skb);
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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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pr_debug("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 false;
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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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pr_debug("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 false;
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}
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}
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return true;
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}
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static struct xt_match iprange_mt_reg __read_mostly = {
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.name = "iprange",
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.family = AF_INET,
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.match = iprange_mt_v0,
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.matchsize = sizeof(struct ipt_iprange_info),
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.me = THIS_MODULE
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};
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static int __init iprange_mt_init(void)
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{
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return xt_register_match(&iprange_mt_reg);
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}
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static void __exit iprange_mt_exit(void)
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{
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xt_unregister_match(&iprange_mt_reg);
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}
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module_init(iprange_mt_init);
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module_exit(iprange_mt_exit);
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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("Xtables: arbitrary IPv4 range matching");
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