net/netfilter/nft_expr_template.c

   1 /*
   2  * Copyright (c) 2008-2009 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/netlink.h>
  14 #include <linux/netfilter.h>
  15 #include <linux/netfilter/nf_tables.h>
  16 #include <net/netfilter/nf_tables.h>
  17
  18 struct nft_template {
  19
  20 };
  21
  22 static void nft_template_eval(const struct nft_expr *expr,
  23                               struct nft_data data[NFT_REG_MAX + 1],
  24                               const struct nft_pktinfo *pkt)
  25 {
  26         struct nft_template *priv = nft_expr_priv(expr);
  27
  28 }
  29
  30 static const struct nla_policy nft_template_policy[NFTA_TEMPLATE_MAX + 1] = {
  31         [NFTA_TEMPLATE_ATTR]            = { .type = NLA_U32 },
  32 };
  33
  34 static int nft_template_init(const struct nft_ctx *ctx,
  35                            const struct nft_expr *expr,
  36                            const struct nlattr * const tb[])
  37 {
  38         struct nft_template *priv = nft_expr_priv(expr);
  39
  40         return 0;
  41 }
  42
  43 static void nft_template_destroy(const struct nft_ctx *ctx,
  44                                const struct nft_expr *expr)
  45 {
  46         struct nft_template *priv = nft_expr_priv(expr);
  47
  48 }
  49
  50 static int nft_template_dump(struct sk_buff *skb, const struct nft_expr *expr)
  51 {
  52         const struct nft_template *priv = nft_expr_priv(expr);
  53
  54         NLA_PUT_BE32(skb, NFTA_TEMPLATE_ATTR, priv->field);
  55         return 0;
  56
  57 nla_put_failure:
  58         return -1;
  59 }
  60
  61 static struct nft_expr_type nft_template_type;
  62 static const struct nft_expr_ops nft_template_ops = {
  63         .type           = &nft_template_type,
  64         .size           = NFT_EXPR_SIZE(sizeof(struct nft_template)),
  65         .eval           = nft_template_eval,
  66         .init           = nft_template_init,
  67         .destroy        = nft_template_destroy,
  68         .dump           = nft_template_dump,
  69 };
  70
  71 static struct nft_expr_type nft_template_type __read_mostly = {
  72         .name           = "template",
  73         .ops            = &nft_template_ops,
  74         .policy         = nft_template_policy,
  75         .maxattr        = NFTA_TEMPLATE_MAX,
  76         .owner          = THIS_MODULE,
  77 };
  78
  79 static int __init nft_template_module_init(void)
  80 {
  81         return nft_register_expr(&nft_template_type);
  82 }
  83
  84 static void __exit nft_template_module_exit(void)
  85 {
  86         nft_unregister_expr(&nft_template_type);
  87 }
  88
  89 module_init(nft_template_module_init);
  90 module_exit(nft_template_module_exit);
  91
  92 MODULE_LICENSE("GPL");
  93 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  94 MODULE_ALIAS_NFT_EXPR("template");