Eric Lee / smarc-ti-linux-kernel

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net/netfilter/xt_nat.c 4.45 KB
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c7232c997   Patrick McHardy   netfilter: add pr... 
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  /*
   * (C) 1999-2001 Paul `Rusty' Russell
   * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
   * (C) 2011 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/module.h>
  #include <linux/skbuff.h>
  #include <linux/netfilter.h>
  #include <linux/netfilter/x_tables.h>
  #include <net/netfilter/nf_nat_core.h>
  
  static int xt_nat_checkentry_v0(const struct xt_tgchk_param *par)
  {
  	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
  
  	if (mr->rangesize != 1) {
  		pr_info("%s: multiple ranges no longer supported
  ",
  			par->target->name);
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static void xt_nat_convert_range(struct nf_nat_range *dst,
  				 const struct nf_nat_ipv4_range *src)
  {
  	memset(&dst->min_addr, 0, sizeof(dst->min_addr));
  	memset(&dst->max_addr, 0, sizeof(dst->max_addr));
  
  	dst->flags	 = src->flags;
  	dst->min_addr.ip = src->min_ip;
  	dst->max_addr.ip = src->max_ip;
  	dst->min_proto	 = src->min;
  	dst->max_proto	 = src->max;
  }
  
  static unsigned int
  xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
  {
  	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
  	struct nf_nat_range range;
  	enum ip_conntrack_info ctinfo;
  	struct nf_conn *ct;
  
  	ct = nf_ct_get(skb, &ctinfo);
  	NF_CT_ASSERT(ct != NULL &&
  		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
  		      ctinfo == IP_CT_RELATED_REPLY));
  
  	xt_nat_convert_range(&range, &mr->range[0]);
  	return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
  }
  
  static unsigned int
  xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
  {
  	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
  	struct nf_nat_range range;
  	enum ip_conntrack_info ctinfo;
  	struct nf_conn *ct;
  
  	ct = nf_ct_get(skb, &ctinfo);
  	NF_CT_ASSERT(ct != NULL &&
  		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
  
  	xt_nat_convert_range(&range, &mr->range[0]);
  	return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
  }
  
  static unsigned int
  xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
  {
  	const struct nf_nat_range *range = par->targinfo;
  	enum ip_conntrack_info ctinfo;
  	struct nf_conn *ct;
  
  	ct = nf_ct_get(skb, &ctinfo);
  	NF_CT_ASSERT(ct != NULL &&
  		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
  		      ctinfo == IP_CT_RELATED_REPLY));
  
  	return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC);
  }
  
  static unsigned int
  xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
  {
  	const struct nf_nat_range *range = par->targinfo;
  	enum ip_conntrack_info ctinfo;
  	struct nf_conn *ct;
  
  	ct = nf_ct_get(skb, &ctinfo);
  	NF_CT_ASSERT(ct != NULL &&
  		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
  
  	return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST);
  }
  
  static struct xt_target xt_nat_target_reg[] __read_mostly = {
  	{
  		.name		= "SNAT",
  		.revision	= 0,
  		.checkentry	= xt_nat_checkentry_v0,
  		.target		= xt_snat_target_v0,
  		.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
  		.family		= NFPROTO_IPV4,
  		.table		= "nat",
  		.hooks		= (1 << NF_INET_POST_ROUTING) |
939ccba43   Elison Niven   netfilter: xt_nat... 
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  				  (1 << NF_INET_LOCAL_IN),
c7232c997   Patrick McHardy   netfilter: add pr... 
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  		.me		= THIS_MODULE,
  	},
  	{
  		.name		= "DNAT",
  		.revision	= 0,
  		.checkentry	= xt_nat_checkentry_v0,
  		.target		= xt_dnat_target_v0,
  		.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
  		.family		= NFPROTO_IPV4,
  		.table		= "nat",
  		.hooks		= (1 << NF_INET_PRE_ROUTING) |
939ccba43   Elison Niven   netfilter: xt_nat... 
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  				  (1 << NF_INET_LOCAL_OUT),
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  		.me		= THIS_MODULE,
  	},
  	{
  		.name		= "SNAT",
  		.revision	= 1,
  		.target		= xt_snat_target_v1,
  		.targetsize	= sizeof(struct nf_nat_range),
  		.table		= "nat",
  		.hooks		= (1 << NF_INET_POST_ROUTING) |
939ccba43   Elison Niven   netfilter: xt_nat... 
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  				  (1 << NF_INET_LOCAL_IN),
c7232c997   Patrick McHardy   netfilter: add pr... 
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  		.me		= THIS_MODULE,
  	},
  	{
  		.name		= "DNAT",
  		.revision	= 1,
  		.target		= xt_dnat_target_v1,
  		.targetsize	= sizeof(struct nf_nat_range),
  		.table		= "nat",
  		.hooks		= (1 << NF_INET_PRE_ROUTING) |
939ccba43   Elison Niven   netfilter: xt_nat... 
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  				  (1 << NF_INET_LOCAL_OUT),
c7232c997   Patrick McHardy   netfilter: add pr... 
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  		.me		= THIS_MODULE,
  	},
  };
  
  static int __init xt_nat_init(void)
  {
  	return xt_register_targets(xt_nat_target_reg,
  				   ARRAY_SIZE(xt_nat_target_reg));
  }
  
  static void __exit xt_nat_exit(void)
  {
  	xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg));
  }
  
  module_init(xt_nat_init);
  module_exit(xt_nat_exit);
  
  MODULE_LICENSE("GPL");
58a317f10   Patrick McHardy   netfilter: ipv6: ... 
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  MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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  MODULE_ALIAS("ipt_SNAT");
  MODULE_ALIAS("ipt_DNAT");
58a317f10   Patrick McHardy   netfilter: ipv6: ... 
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  MODULE_ALIAS("ip6t_SNAT");
  MODULE_ALIAS("ip6t_DNAT");