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Linux/net/ipv6/netfilter/nft_reject_ipv6.c

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  1 /*
  2  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
  3  * Copyright (c) 2013 Eric Leblond <eric@regit.org>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  * Development of this code funded by Astaro AG (http://www.astaro.com/)
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/init.h>
 14 #include <linux/module.h>
 15 #include <linux/netlink.h>
 16 #include <linux/netfilter.h>
 17 #include <linux/netfilter/nf_tables.h>
 18 #include <net/netfilter/nf_tables.h>
 19 #include <net/netfilter/nft_reject.h>
 20 #include <net/netfilter/ipv6/nf_reject.h>
 21 
 22 static void nft_reject_ipv6_eval(const struct nft_expr *expr,
 23                                  struct nft_regs *regs,
 24                                  const struct nft_pktinfo *pkt)
 25 {
 26         struct nft_reject *priv = nft_expr_priv(expr);
 27 
 28         switch (priv->type) {
 29         case NFT_REJECT_ICMP_UNREACH:
 30                 nf_send_unreach6(pkt->net, pkt->skb, priv->icmp_code,
 31                                  pkt->hook);
 32                 break;
 33         case NFT_REJECT_TCP_RST:
 34                 nf_send_reset6(pkt->net, pkt->skb, pkt->hook);
 35                 break;
 36         default:
 37                 break;
 38         }
 39 
 40         regs->verdict.code = NF_DROP;
 41 }
 42 
 43 static struct nft_expr_type nft_reject_ipv6_type;
 44 static const struct nft_expr_ops nft_reject_ipv6_ops = {
 45         .type           = &nft_reject_ipv6_type,
 46         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
 47         .eval           = nft_reject_ipv6_eval,
 48         .init           = nft_reject_init,
 49         .dump           = nft_reject_dump,
 50 };
 51 
 52 static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
 53         .family         = NFPROTO_IPV6,
 54         .name           = "reject",
 55         .ops            = &nft_reject_ipv6_ops,
 56         .policy         = nft_reject_policy,
 57         .maxattr        = NFTA_REJECT_MAX,
 58         .owner          = THIS_MODULE,
 59 };
 60 
 61 static int __init nft_reject_ipv6_module_init(void)
 62 {
 63         return nft_register_expr(&nft_reject_ipv6_type);
 64 }
 65 
 66 static void __exit nft_reject_ipv6_module_exit(void)
 67 {
 68         nft_unregister_expr(&nft_reject_ipv6_type);
 69 }
 70 
 71 module_init(nft_reject_ipv6_module_init);
 72 module_exit(nft_reject_ipv6_module_exit);
 73 
 74 MODULE_LICENSE("GPL");
 75 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
 77 

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