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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_addrtype.c] - Rev 8
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/* * iptables module to match inet_addr_type() of an ip. * * Copyright (c) 2004 Patrick McHardy <kaber@trash.net> * * 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/kernel.h> #include <linux/module.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/ip.h> #include <net/route.h> #include <linux/netfilter_ipv4/ipt_addrtype.h> #include <linux/netfilter/x_tables.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); MODULE_DESCRIPTION("iptables addrtype match"); static inline bool match_type(__be32 addr, u_int16_t mask) { return !!(mask & (1 << inet_addr_type(addr))); } 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_addrtype_info *info = matchinfo; const struct iphdr *iph = ip_hdr(skb); bool ret = true; if (info->source) ret &= match_type(iph->saddr, info->source)^info->invert_source; if (info->dest) ret &= match_type(iph->daddr, info->dest)^info->invert_dest; return ret; } static struct xt_match addrtype_match __read_mostly = { .name = "addrtype", .family = AF_INET, .match = match, .matchsize = sizeof(struct ipt_addrtype_info), .me = THIS_MODULE }; static int __init ipt_addrtype_init(void) { return xt_register_match(&addrtype_match); } static void __exit ipt_addrtype_fini(void) { xt_unregister_match(&addrtype_match); } module_init(ipt_addrtype_init); module_exit(ipt_addrtype_fini);