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_tables.h>
  16#include <net/netfilter/nf_nat.h>
  17#include <net/netfilter/nft_masq.h>
  18
  19const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
  20        [NFTA_MASQ_FLAGS]               = { .type = NLA_U32 },
  21        [NFTA_MASQ_REG_PROTO_MIN]       = { .type = NLA_U32 },
  22        [NFTA_MASQ_REG_PROTO_MAX]       = { .type = NLA_U32 },
  23};
  24EXPORT_SYMBOL_GPL(nft_masq_policy);
  25
  26int nft_masq_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_POST_ROUTING));
  38}
  39EXPORT_SYMBOL_GPL(nft_masq_validate);
  40
  41int nft_masq_init(const struct nft_ctx *ctx,
  42                  const struct nft_expr *expr,
  43                  const struct nlattr * const tb[])
  44{
  45        u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
  46        struct nft_masq *priv = nft_expr_priv(expr);
  47        int err;
  48
  49        err = nft_masq_validate(ctx, expr, NULL);
  50        if (err)
  51                return err;
  52
  53        if (tb[NFTA_MASQ_FLAGS]) {
  54                priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
  55                if (priv->flags & ~NF_NAT_RANGE_MASK)
  56                        return -EINVAL;
  57        }
  58
  59        if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
  60                priv->sreg_proto_min =
  61                        nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MIN]);
  62
  63                err = nft_validate_register_load(priv->sreg_proto_min, plen);
  64                if (err < 0)
  65                        return err;
  66
  67                if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
  68                        priv->sreg_proto_max =
  69                                nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MAX]);
  70
  71                        err = nft_validate_register_load(priv->sreg_proto_max,
  72                                                         plen);
  73                        if (err < 0)
  74                                return err;
  75                } else {
  76                        priv->sreg_proto_max = priv->sreg_proto_min;
  77                }
  78        }
  79
  80        return 0;
  81}
  82EXPORT_SYMBOL_GPL(nft_masq_init);
  83
  84int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
  85{
  86        const struct nft_masq *priv = nft_expr_priv(expr);
  87
  88        if (priv->flags != 0 &&
  89            nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags)))
  90                goto nla_put_failure;
  91
  92        if (priv->sreg_proto_min) {
  93                if (nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MIN,
  94                                      priv->sreg_proto_min) ||
  95                    nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MAX,
  96                                      priv->sreg_proto_max))
  97                        goto nla_put_failure;
  98        }
  99
 100        return 0;
 101
 102nla_put_failure:
 103        return -1;
 104}
 105EXPORT_SYMBOL_GPL(nft_masq_dump);
 106
 107MODULE_LICENSE("GPL");
 108MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
 109