12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485 |
- /*
- * iptables module to match IP address ranges
- *
- * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/ip.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter_ipv4/ipt_iprange.h>
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
- MODULE_DESCRIPTION("iptables arbitrary IP range match module");
- #if 0
- #define DEBUGP printk
- #else
- #define DEBUGP(format, args...)
- #endif
- static int
- match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset, unsigned int protoff, int *hotdrop)
- {
- const struct ipt_iprange_info *info = matchinfo;
- const struct iphdr *iph = skb->nh.iph;
- if (info->flags & IPRANGE_SRC) {
- if (((ntohl(iph->saddr) < ntohl(info->src.min_ip))
- || (ntohl(iph->saddr) > ntohl(info->src.max_ip)))
- ^ !!(info->flags & IPRANGE_SRC_INV)) {
- DEBUGP("src IP %u.%u.%u.%u NOT in range %s"
- "%u.%u.%u.%u-%u.%u.%u.%u\n",
- NIPQUAD(iph->saddr),
- info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
- NIPQUAD(info->src.min_ip),
- NIPQUAD(info->src.max_ip));
- return 0;
- }
- }
- if (info->flags & IPRANGE_DST) {
- if (((ntohl(iph->daddr) < ntohl(info->dst.min_ip))
- || (ntohl(iph->daddr) > ntohl(info->dst.max_ip)))
- ^ !!(info->flags & IPRANGE_DST_INV)) {
- DEBUGP("dst IP %u.%u.%u.%u NOT in range %s"
- "%u.%u.%u.%u-%u.%u.%u.%u\n",
- NIPQUAD(iph->daddr),
- info->flags & IPRANGE_DST_INV ? "(INV) " : "",
- NIPQUAD(info->dst.min_ip),
- NIPQUAD(info->dst.max_ip));
- return 0;
- }
- }
- return 1;
- }
- static struct xt_match iprange_match = {
- .name = "iprange",
- .family = AF_INET,
- .match = match,
- .matchsize = sizeof(struct ipt_iprange_info),
- .me = THIS_MODULE
- };
- static int __init ipt_iprange_init(void)
- {
- return xt_register_match(&iprange_match);
- }
- static void __exit ipt_iprange_fini(void)
- {
- xt_unregister_match(&iprange_match);
- }
- module_init(ipt_iprange_init);
- module_exit(ipt_iprange_fini);
|