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TOMOYO Linux Cross Reference
Linux/net/netfilter/nft_reject.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 <linux/icmp.h>
 21 #include <linux/icmpv6.h>
 22 
 23 const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
 24         [NFTA_REJECT_TYPE]              = { .type = NLA_U32 },
 25         [NFTA_REJECT_ICMP_CODE]         = { .type = NLA_U8 },
 26 };
 27 EXPORT_SYMBOL_GPL(nft_reject_policy);
 28 
 29 int nft_reject_validate(const struct nft_ctx *ctx,
 30                         const struct nft_expr *expr,
 31                         const struct nft_data **data)
 32 {
 33         return nft_chain_validate_hooks(ctx->chain,
 34                                         (1 << NF_INET_LOCAL_IN) |
 35                                         (1 << NF_INET_FORWARD) |
 36                                         (1 << NF_INET_LOCAL_OUT));
 37 }
 38 EXPORT_SYMBOL_GPL(nft_reject_validate);
 39 
 40 int nft_reject_init(const struct nft_ctx *ctx,
 41                     const struct nft_expr *expr,
 42                     const struct nlattr * const tb[])
 43 {
 44         struct nft_reject *priv = nft_expr_priv(expr);
 45 
 46         if (tb[NFTA_REJECT_TYPE] == NULL)
 47                 return -EINVAL;
 48 
 49         priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
 50         switch (priv->type) {
 51         case NFT_REJECT_ICMP_UNREACH:
 52                 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
 53                         return -EINVAL;
 54                 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
 55         case NFT_REJECT_TCP_RST:
 56                 break;
 57         default:
 58                 return -EINVAL;
 59         }
 60 
 61         return 0;
 62 }
 63 EXPORT_SYMBOL_GPL(nft_reject_init);
 64 
 65 int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
 66 {
 67         const struct nft_reject *priv = nft_expr_priv(expr);
 68 
 69         if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
 70                 goto nla_put_failure;
 71 
 72         switch (priv->type) {
 73         case NFT_REJECT_ICMP_UNREACH:
 74                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
 75                         goto nla_put_failure;
 76                 break;
 77         default:
 78                 break;
 79         }
 80 
 81         return 0;
 82 
 83 nla_put_failure:
 84         return -1;
 85 }
 86 EXPORT_SYMBOL_GPL(nft_reject_dump);
 87 
 88 static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
 89         [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMP_NET_UNREACH,
 90         [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMP_PORT_UNREACH,
 91         [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMP_HOST_UNREACH,
 92         [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMP_PKT_FILTERED,
 93 };
 94 
 95 int nft_reject_icmp_code(u8 code)
 96 {
 97         if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
 98                 return ICMP_NET_UNREACH;
 99 
100         return icmp_code_v4[code];
101 }
102 
103 EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
104 
105 
106 static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
107         [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMPV6_NOROUTE,
108         [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMPV6_PORT_UNREACH,
109         [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMPV6_ADDR_UNREACH,
110         [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMPV6_ADM_PROHIBITED,
111 };
112 
113 int nft_reject_icmpv6_code(u8 code)
114 {
115         if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
116                 return ICMPV6_NOROUTE;
117 
118         return icmp_code_v6[code];
119 }
120 
121 EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
122 
123 MODULE_LICENSE("GPL");
124 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
125 

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