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nft_reject.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2008-2009 Patrick McHardy <[email protected]>
* Copyright (c) 2013 Eric Leblond <[email protected]>
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#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_tables.h>
#include <net/netfilter/nft_reject.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>
const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
[NFTA_REJECT_TYPE] = { .type = NLA_U32 },
[NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
};
EXPORT_SYMBOL_GPL(nft_reject_policy);
int nft_reject_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
return nft_chain_validate_hooks(ctx->chain,
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_PRE_ROUTING));
}
EXPORT_SYMBOL_GPL(nft_reject_validate);
int nft_reject_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_reject *priv = nft_expr_priv(expr);
int icmp_code;
if (tb[NFTA_REJECT_TYPE] == NULL)
return -EINVAL;
priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
case NFT_REJECT_ICMPX_UNREACH:
if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
return -EINVAL;
icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
icmp_code > NFT_REJECT_ICMPX_MAX)
return -EINVAL;
priv->icmp_code = icmp_code;
break;
case NFT_REJECT_TCP_RST:
break;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(nft_reject_init);
int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_reject *priv = nft_expr_priv(expr);
if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
goto nla_put_failure;
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
case NFT_REJECT_ICMPX_UNREACH:
if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
goto nla_put_failure;
break;
default:
break;
}
return 0;
nla_put_failure:
return -1;
}
EXPORT_SYMBOL_GPL(nft_reject_dump);
static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
[NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
};
int nft_reject_icmp_code(u8 code)
{
if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
return ICMP_NET_UNREACH;
return icmp_code_v4[code];
}
EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
[NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
};
int nft_reject_icmpv6_code(u8 code)
{
if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
return ICMPV6_NOROUTE;
return icmp_code_v6[code];
}
EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <[email protected]>");
MODULE_DESCRIPTION("Netfilter x_tables over nftables module");