2014-06-27 11:36:11 +00:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.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_tables.h>
|
|
|
|
#include <net/netfilter/nft_reject.h>
|
2014-09-26 12:35:14 +00:00
|
|
|
#include <net/netfilter/ipv4/nf_reject.h>
|
|
|
|
#include <net/netfilter/ipv6/nf_reject.h>
|
2014-06-27 11:36:11 +00:00
|
|
|
|
|
|
|
static void nft_reject_bridge_eval(const struct nft_expr *expr,
|
|
|
|
struct nft_data data[NFT_REG_MAX + 1],
|
|
|
|
const struct nft_pktinfo *pkt)
|
|
|
|
{
|
2014-09-26 12:35:14 +00:00
|
|
|
struct nft_reject *priv = nft_expr_priv(expr);
|
|
|
|
struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
|
|
|
|
|
2014-06-27 11:36:11 +00:00
|
|
|
switch (eth_hdr(pkt->skb)->h_proto) {
|
|
|
|
case htons(ETH_P_IP):
|
2014-09-26 12:35:14 +00:00
|
|
|
switch (priv->type) {
|
|
|
|
case NFT_REJECT_ICMP_UNREACH:
|
|
|
|
nf_send_unreach(pkt->skb, priv->icmp_code);
|
|
|
|
break;
|
|
|
|
case NFT_REJECT_TCP_RST:
|
|
|
|
nf_send_reset(pkt->skb, pkt->ops->hooknum);
|
|
|
|
break;
|
|
|
|
case NFT_REJECT_ICMPX_UNREACH:
|
|
|
|
nf_send_unreach(pkt->skb,
|
|
|
|
nft_reject_icmp_code(priv->icmp_code));
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
2014-06-27 11:36:11 +00:00
|
|
|
case htons(ETH_P_IPV6):
|
2014-09-26 12:35:14 +00:00
|
|
|
switch (priv->type) {
|
|
|
|
case NFT_REJECT_ICMP_UNREACH:
|
|
|
|
nf_send_unreach6(net, pkt->skb, priv->icmp_code,
|
|
|
|
pkt->ops->hooknum);
|
|
|
|
break;
|
|
|
|
case NFT_REJECT_TCP_RST:
|
|
|
|
nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
|
|
|
|
break;
|
|
|
|
case NFT_REJECT_ICMPX_UNREACH:
|
|
|
|
nf_send_unreach6(net, pkt->skb,
|
|
|
|
nft_reject_icmpv6_code(priv->icmp_code),
|
|
|
|
pkt->ops->hooknum);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
2014-06-27 11:36:11 +00:00
|
|
|
default:
|
|
|
|
/* No explicit way to reject this protocol, drop it. */
|
|
|
|
break;
|
|
|
|
}
|
2014-09-26 12:35:14 +00:00
|
|
|
data[NFT_REG_VERDICT].verdict = NF_DROP;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nft_reject_bridge_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;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nft_reject_bridge_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;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
nla_put_failure:
|
|
|
|
return -1;
|
2014-06-27 11:36:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_reject_bridge_type;
|
|
|
|
static const struct nft_expr_ops nft_reject_bridge_ops = {
|
|
|
|
.type = &nft_reject_bridge_type,
|
|
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
|
|
|
|
.eval = nft_reject_bridge_eval,
|
2014-09-26 12:35:14 +00:00
|
|
|
.init = nft_reject_bridge_init,
|
|
|
|
.dump = nft_reject_bridge_dump,
|
2014-06-27 11:36:11 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
|
|
|
|
.family = NFPROTO_BRIDGE,
|
|
|
|
.name = "reject",
|
|
|
|
.ops = &nft_reject_bridge_ops,
|
|
|
|
.policy = nft_reject_policy,
|
|
|
|
.maxattr = NFTA_REJECT_MAX,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init nft_reject_bridge_module_init(void)
|
|
|
|
{
|
|
|
|
return nft_register_expr(&nft_reject_bridge_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nft_reject_bridge_module_exit(void)
|
|
|
|
{
|
|
|
|
nft_unregister_expr(&nft_reject_bridge_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nft_reject_bridge_module_init);
|
|
|
|
module_exit(nft_reject_bridge_module_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
|
|
|
MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");
|