LXR linux/net/netfilter/nft

   1/*
   2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
   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        plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
  51        if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
  52                priv->sreg_proto_min =
  53                        nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
  54
  55                err = nft_validate_register_load(priv->sreg_proto_min, plen);
  56                if (err < 0)
  57                        return err;
  58
  59                if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
  60                        priv->sreg_proto_max =
  61                                nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
  62
  63                        err = nft_validate_register_load(priv->sreg_proto_max,
  64                                                         plen);
  65                        if (err < 0)
  66                                return err;
  67                } else {
  68                        priv->sreg_proto_max = priv->sreg_proto_min;
  69                }
  70        }
  71
  72        if (tb[NFTA_REDIR_FLAGS]) {
  73                priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
  74                if (priv->flags & ~NF_NAT_RANGE_MASK)
  75                        return -EINVAL;
  76        }
  77
  78        return nf_ct_netns_get(ctx->net, ctx->family);
  79}
  80EXPORT_SYMBOL_GPL(nft_redir_init);
  81
  82int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
  83{
  84        const struct nft_redir *priv = nft_expr_priv(expr);
  85
  86        if (priv->sreg_proto_min) {
  87                if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
  88                                      priv->sreg_proto_min))
  89                        goto nla_put_failure;
  90                if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
  91                                      priv->sreg_proto_max))
  92                        goto nla_put_failure;
  93        }
  94
  95        if (priv->flags != 0 &&
  96            nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
  97                        goto nla_put_failure;
  98
  99        return 0;
 100
 101nla_put_failure:
 102        return -1;
 103}
 104EXPORT_SYMBOL_GPL(nft_redir_dump);
 105
 106MODULE_LICENSE("GPL");
 107MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
 108