LXR linux/net/netfilter/nft

   1/*
   2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
   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
   9#include <linux/kernel.h>
  10#include <linux/init.h>
  11#include <linux/module.h>
  12#include <linux/netlink.h>
  13#include <linux/netfilter.h>
  14#include <linux/netfilter/nf_tables.h>
  15#include <net/netfilter/nf_nat.h>
  16#include <net/netfilter/nf_tables.h>
  17#include <net/netfilter/nft_redir.h>
  18
  19const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
  20        [NFTA_REDIR_REG_PROTO_MIN]      = { .type = NLA_U32 },
  21        [NFTA_REDIR_REG_PROTO_MAX]      = { .type = NLA_U32 },
  22        [NFTA_REDIR_FLAGS]              = { .type = NLA_U32 },
  23};
  24EXPORT_SYMBOL_GPL(nft_redir_policy);
  25
  26int nft_redir_validate(const struct nft_ctx *ctx,
  27                       const struct nft_expr *expr,
  28                       const struct nft_data **data)
  29{
  30        int err;
  31
  32        err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
  33        if (err < 0)
  34                return err;
  35
  36        return nft_chain_validate_hooks(ctx->chain,
  37                                        (1 << NF_INET_PRE_ROUTING) |
  38                                        (1 << NF_INET_LOCAL_OUT));
  39}
  40EXPORT_SYMBOL_GPL(nft_redir_validate);
  41
  42int nft_redir_init(const struct nft_ctx *ctx,
  43                   const struct nft_expr *expr,
  44                   const struct nlattr * const tb[])
  45{
  46        struct nft_redir *priv = nft_expr_priv(expr);
  47        unsigned int plen;
  48        int err;
  49
  50        err = nft_redir_validate(ctx, expr, NULL);
  51        if (err < 0)
  52                return err;
  53
  54        plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
  55        if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
  56                priv->sreg_proto_min =
  57                        nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
  58
  59                err = nft_validate_register_load(priv->sreg_proto_min, plen);
  60                if (err < 0)
  61                        return err;
  62
  63                if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
  64                        priv->sreg_proto_max =
  65                                nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
  66
  67                        err = nft_validate_register_load(priv->sreg_proto_max,
  68                                                         plen);
  69                        if (err < 0)
  70                                return err;
  71                } else {
  72                        priv->sreg_proto_max = priv->sreg_proto_min;
  73                }
  74        }
  75
  76        if (tb[NFTA_REDIR_FLAGS]) {
  77                priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
  78                if (priv->flags & ~NF_NAT_RANGE_MASK)
  79                        return -EINVAL;
  80        }
  81
  82        return 0;
  83}
  84EXPORT_SYMBOL_GPL(nft_redir_init);
  85
  86int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
  87{
  88        const struct nft_redir *priv = nft_expr_priv(expr);
  89
  90        if (priv->sreg_proto_min) {
  91                if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
  92                                      priv->sreg_proto_min))
  93                        goto nla_put_failure;
  94                if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
  95                                      priv->sreg_proto_max))
  96                        goto nla_put_failure;
  97        }
  98
  99        if (priv->flags != 0 &&
 100            nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
 101                        goto nla_put_failure;
 102
 103        return 0;
 104
 105nla_put_failure:
 106        return -1;
 107}
 108EXPORT_SYMBOL_GPL(nft_redir_dump);
 109
 110MODULE_LICENSE("GPL");
 111MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
 112