net/netfilter/nft_meta_target.c

   1 /*
   2  * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/list.h>
  14 #include <linux/rbtree.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
  20 struct nft_meta {
  21         enum nft_meta_keys      key;
  22 };
  23
  24 static void nft_meta_eval(const struct nft_expr *expr,
  25                           struct nft_data *nfres,
  26                           struct nft_data *data,
  27                           const struct nft_pktinfo *pkt)
  28 {
  29         const struct nft_meta *meta = nft_expr_priv(expr);
  30         struct sk_buff *skb = pkt->skb;
  31         u32 val = data->data[0];
  32
  33         switch (meta->key) {
  34         case NFT_META_MARK:
  35                 skb->mark = val;
  36                 break;
  37         case NFT_META_PRIORITY:
  38                 skb->priority = val;
  39                 break;
  40         case NFT_META_NFTRACE:
  41                 skb->nf_trace = val;
  42                 break;
  43 #ifdef CONFIG_NETWORK_SECMARK
  44         case NFT_META_SECMARK:
  45                 skb->secmark = val;
  46                 break;
  47 #endif
  48         default:
  49                 WARN_ON(1);
  50         }
  51 }
  52
  53 static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
  54         [NFTA_META_KEY]         = { .type = NLA_U32 },
  55 };
  56
  57 static int nft_meta_init(const struct nft_expr *expr, struct nlattr *tb[])
  58 {
  59         struct nft_meta *meta = nft_expr_priv(expr);
  60
  61         if (tb[NFTA_META_KEY] == NULL)
  62                 return -EINVAL;
  63
  64         meta->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
  65         switch (meta->key) {
  66         case NFT_META_MARK:
  67         case NFT_META_PRIORITY:
  68         case NFT_META_NFTRACE:
  69 #ifdef CONFIG_NETWORK_SECMARK
  70         case NFT_META_SECMARK:
  71 #endif
  72                 break;
  73         default:
  74                 return -EINVAL;
  75         }
  76
  77         return 0;
  78 }
  79
  80 static int nft_meta_dump(struct sk_buff *skb, const struct nft_expr *expr)
  81 {
  82         struct nft_meta *meta = nft_expr_priv(expr);
  83
  84         NLA_PUT_BE32(skb, NFTA_META_KEY, htonl(meta->key));
  85         return 0;
  86
  87 nla_put_failure:
  88         return -1;
  89 }
  90
  91 static struct nft_expr_ops meta_target __read_mostly = {
  92         .name           = "meta",
  93         .size           = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
  94         .owner          = THIS_MODULE,
  95         .eval           = nft_meta_eval,
  96         .init           = nft_meta_init,
  97         .dump           = nft_meta_dump,
  98         .policy         = nft_meta_policy,
  99         .maxattr        = NFTA_META_MAX,
 100 };
 101
 102 static int __init nft_meta_target_init(void)
 103 {
 104         return nft_register_expr(&meta_target);
 105 }
 106
 107 static void __exit nft_meta_target_exit(void)
 108 {
 109         nft_unregister_expr(&meta_target);
 110 }
 111
 112 module_init(nft_meta_target_init);
 113 module_exit(nft_meta_target_exit);
 114
 115 MODULE_LICENSE("GPL");
 116 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 117 MODULE_ALIAS_NFT_EXPR("meta");