Eric Lee / smarc-fsl-linux-kernel

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net/ipv6/netfilter/nft_dup_ipv6.c 2.96 KB
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d877f0711   Pablo Neira Ayuso   netfilter: nf_tab... 
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  /*
   * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   *
   * 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/init.h>
  #include <linux/module.h>
  #include <linux/netlink.h>
  #include <linux/netfilter.h>
  #include <linux/netfilter/nf_tables.h>
  #include <net/netfilter/nf_tables.h>
  #include <net/netfilter/ipv6/nf_dup_ipv6.h>
  
  struct nft_dup_ipv6 {
  	enum nft_registers	sreg_addr:8;
  	enum nft_registers	sreg_dev:8;
  };
  
  static void nft_dup_ipv6_eval(const struct nft_expr *expr,
  			      struct nft_regs *regs,
  			      const struct nft_pktinfo *pkt)
  {
  	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
  	struct in6_addr *gw = (struct in6_addr *)&regs->data[priv->sreg_addr];
b73b8a1ba   Liping Zhang   netfilter: nft_du... 
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  	int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
d877f0711   Pablo Neira Ayuso   netfilter: nf_tab... 
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206e8c007
 
 Eric W. Biederman
 
netfilter: Pass n...




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  	nf_dup_ipv6(pkt->net, pkt->skb, pkt->hook, gw, oif);









d877f0711
 
 Pablo Neira Ayuso
 
netfilter: nf_tab...




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  }
  
  static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
  			     const struct nft_expr *expr,
  			     const struct nlattr * const tb[])
  {
  	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
  	int err;
  
  	if (tb[NFTA_DUP_SREG_ADDR] == NULL)
  		return -EINVAL;
  
  	priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
  	err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
  	if (err < 0)
  		return err;
  
  	if (tb[NFTA_DUP_SREG_DEV] != NULL) {
  		priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
  		return nft_validate_register_load(priv->sreg_dev, sizeof(int));
  	}
  	return 0;
  }
  
  static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
  {
  	struct nft_dup_ipv6 *priv = nft_expr_priv(expr);









b73b8a1ba
 
 Liping Zhang
 
netfilter: nft_du...




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  	if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
  		goto nla_put_failure;
  	if (priv->sreg_dev &&









d877f0711
 
 Pablo Neira Ayuso
 
netfilter: nf_tab...




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  	    nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
  		goto nla_put_failure;
  
  	return 0;
  
  nla_put_failure:
  	return -1;
  }
  
  static struct nft_expr_type nft_dup_ipv6_type;
  static const struct nft_expr_ops nft_dup_ipv6_ops = {
  	.type		= &nft_dup_ipv6_type,
  	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
  	.eval		= nft_dup_ipv6_eval,
  	.init		= nft_dup_ipv6_init,
  	.dump		= nft_dup_ipv6_dump,
  };
  
  static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
  	[NFTA_DUP_SREG_ADDR]	= { .type = NLA_U32 },
  	[NFTA_DUP_SREG_DEV]	= { .type = NLA_U32 },
  };
  
  static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
  	.family		= NFPROTO_IPV6,
  	.name		= "dup",
  	.ops		= &nft_dup_ipv6_ops,
  	.policy		= nft_dup_ipv6_policy,
  	.maxattr	= NFTA_DUP_MAX,
  	.owner		= THIS_MODULE,
  };
  
  static int __init nft_dup_ipv6_module_init(void)
  {
  	return nft_register_expr(&nft_dup_ipv6_type);
  }
  
  static void __exit nft_dup_ipv6_module_exit(void)
  {
  	nft_unregister_expr(&nft_dup_ipv6_type);
  }
  
  module_init(nft_dup_ipv6_module_init);
  module_exit(nft_dup_ipv6_module_exit);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");