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