2019-06-04 02:11:33 -06:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
2014-02-05 08:03:39 -07:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#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>
|
2014-09-26 06:35:14 -06:00
|
|
|
#include <net/netfilter/ipv4/nf_reject.h>
|
|
|
|
#include <net/netfilter/ipv6/nf_reject.h>
|
2014-02-05 08:03:39 -07:00
|
|
|
|
|
|
|
static void nft_reject_inet_eval(const struct nft_expr *expr,
|
2015-04-10 19:27:31 -06:00
|
|
|
struct nft_regs *regs,
|
2014-02-05 08:03:39 -07:00
|
|
|
const struct nft_pktinfo *pkt)
|
|
|
|
{
|
2014-09-26 06:35:14 -06:00
|
|
|
struct nft_reject *priv = nft_expr_priv(expr);
|
|
|
|
|
2016-11-03 03:56:26 -06:00
|
|
|
switch (nft_pf(pkt)) {
|
2014-02-05 08:03:39 -07:00
|
|
|
case NFPROTO_IPV4:
|
2014-09-26 06:35:14 -06:00
|
|
|
switch (priv->type) {
|
|
|
|
case NFT_REJECT_ICMP_UNREACH:
|
2015-02-16 10:54:04 -07:00
|
|
|
nf_send_unreach(pkt->skb, priv->icmp_code,
|
2016-11-03 03:56:26 -06:00
|
|
|
nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
case NFT_REJECT_TCP_RST:
|
2016-11-03 03:56:26 -06:00
|
|
|
nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
case NFT_REJECT_ICMPX_UNREACH:
|
|
|
|
nf_send_unreach(pkt->skb,
|
2015-02-16 10:54:04 -07:00
|
|
|
nft_reject_icmp_code(priv->icmp_code),
|
2016-11-03 03:56:26 -06:00
|
|
|
nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
2014-02-05 08:03:39 -07:00
|
|
|
case NFPROTO_IPV6:
|
2014-09-26 06:35:14 -06:00
|
|
|
switch (priv->type) {
|
|
|
|
case NFT_REJECT_ICMP_UNREACH:
|
2016-11-03 03:56:26 -06:00
|
|
|
nf_send_unreach6(nft_net(pkt), pkt->skb,
|
|
|
|
priv->icmp_code, nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
case NFT_REJECT_TCP_RST:
|
2016-11-03 03:56:26 -06:00
|
|
|
nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
case NFT_REJECT_ICMPX_UNREACH:
|
2016-11-03 03:56:26 -06:00
|
|
|
nf_send_unreach6(nft_net(pkt), pkt->skb,
|
2014-09-26 06:35:14 -06:00
|
|
|
nft_reject_icmpv6_code(priv->icmp_code),
|
2016-11-03 03:56:26 -06:00
|
|
|
nft_hook(pkt));
|
2014-09-26 06:35:14 -06:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
2015-04-10 19:27:31 -06:00
|
|
|
|
|
|
|
regs->verdict.code = NF_DROP;
|
2014-09-26 06:35:14 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int nft_reject_inet_init(const struct nft_ctx *ctx,
|
|
|
|
const struct nft_expr *expr,
|
|
|
|
const struct nlattr * const tb[])
|
|
|
|
{
|
|
|
|
struct nft_reject *priv = nft_expr_priv(expr);
|
netfilter: nf_tables: validate the expr explicitly after init successfully
When we want to validate the expr's dependency or hooks, we must do two
things to accomplish it. First, write a X_validate callback function
and point ->validate to it. Second, call X_validate in init routine.
This is very common, such as fib, nat, reject expr and so on ...
It is a little ugly, since we will call X_validate in the expr's init
routine, it's better to do it in nf_tables_newexpr. So we can avoid to
do this again and again. After doing this, the second step listed above
is not useful anymore, remove them now.
Patch was tested by nftables/tests/py/nft-test.py and
nftables/tests/shell/run-tests.sh.
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-03-05 06:02:23 -07:00
|
|
|
int icmp_code;
|
2014-09-26 06:35:14 -06:00
|
|
|
|
|
|
|
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;
|
2014-02-05 08:03:39 -07:00
|
|
|
}
|
2014-09-26 06:35:14 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nft_reject_inet_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;
|
2015-04-27 11:20:34 -06:00
|
|
|
default:
|
|
|
|
break;
|
2014-09-26 06:35:14 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
nla_put_failure:
|
|
|
|
return -1;
|
2014-02-05 08:03:39 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_reject_inet_type;
|
|
|
|
static const struct nft_expr_ops nft_reject_inet_ops = {
|
|
|
|
.type = &nft_reject_inet_type,
|
|
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
|
|
|
|
.eval = nft_reject_inet_eval,
|
2014-09-26 06:35:14 -06:00
|
|
|
.init = nft_reject_inet_init,
|
|
|
|
.dump = nft_reject_inet_dump,
|
2016-08-21 11:02:18 -06:00
|
|
|
.validate = nft_reject_validate,
|
2014-02-05 08:03:39 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_reject_inet_type __read_mostly = {
|
|
|
|
.family = NFPROTO_INET,
|
|
|
|
.name = "reject",
|
|
|
|
.ops = &nft_reject_inet_ops,
|
|
|
|
.policy = nft_reject_policy,
|
|
|
|
.maxattr = NFTA_REJECT_MAX,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init nft_reject_inet_module_init(void)
|
|
|
|
{
|
|
|
|
return nft_register_expr(&nft_reject_inet_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nft_reject_inet_module_exit(void)
|
|
|
|
{
|
|
|
|
nft_unregister_expr(&nft_reject_inet_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nft_reject_inet_module_init);
|
|
|
|
module_exit(nft_reject_inet_module_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
|
|
MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
|