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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [ipv4/] [netfilter/] [ipt_iprange.c] - Rev 8
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/* * 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"); static bool 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, bool *hotdrop) { const struct ipt_iprange_info *info = matchinfo; const struct iphdr *iph = ip_hdr(skb); 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)) { pr_debug("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 false; } } 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)) { pr_debug("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 false; } } return true; } static struct xt_match iprange_match __read_mostly = { .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);