/*
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* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nft_masq.h>
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const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
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[NFTA_MASQ_FLAGS] = { .type = NLA_U32 },
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[NFTA_MASQ_REG_PROTO_MIN] = { .type = NLA_U32 },
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[NFTA_MASQ_REG_PROTO_MAX] = { .type = NLA_U32 },
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};
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EXPORT_SYMBOL_GPL(nft_masq_policy);
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int nft_masq_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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int err;
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err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
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if (err < 0)
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return err;
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return nft_chain_validate_hooks(ctx->chain,
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(1 << NF_INET_POST_ROUTING));
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}
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EXPORT_SYMBOL_GPL(nft_masq_validate);
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int nft_masq_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
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struct nft_masq *priv = nft_expr_priv(expr);
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int err;
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if (tb[NFTA_MASQ_FLAGS]) {
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priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
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if (priv->flags & ~NF_NAT_RANGE_MASK)
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return -EINVAL;
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}
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if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
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priv->sreg_proto_min =
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nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MIN]);
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err = nft_validate_register_load(priv->sreg_proto_min, plen);
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if (err < 0)
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return err;
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if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
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priv->sreg_proto_max =
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nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MAX]);
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err = nft_validate_register_load(priv->sreg_proto_max,
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plen);
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if (err < 0)
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return err;
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} else {
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priv->sreg_proto_max = priv->sreg_proto_min;
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}
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}
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return nf_ct_netns_get(ctx->net, ctx->family);
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}
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EXPORT_SYMBOL_GPL(nft_masq_init);
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int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_masq *priv = nft_expr_priv(expr);
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if (priv->flags != 0 &&
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nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags)))
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goto nla_put_failure;
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if (priv->sreg_proto_min) {
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if (nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MIN,
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priv->sreg_proto_min) ||
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nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MAX,
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priv->sreg_proto_max))
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goto nla_put_failure;
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}
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return 0;
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nla_put_failure:
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return -1;
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}
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EXPORT_SYMBOL_GPL(nft_masq_dump);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
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