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netfilter: nft_reject: support for IPv6 and TCP reset

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This patch moves nft_reject_ipv4 to nft_reject and adds support
for IPv6 protocol. This patch uses functions included in nf_reject.h
to implement reject by TCP reset.

The code has to be build as a module if NF_TABLES_IPV6 is also a
module to avoid compilation error due to usage of IPv6 functions.
This has been done in Kconfig by using the construct:

 depends on NF_TABLES_IPV6 || !NF_TABLES_IPV6

This seems a bit weird in terms of syntax but works perfectly.

Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Eric Leblond 2013-12-29 12:28:14 +01:00 committed by Pablo Neira Ayuso
parent cc70d069e2
commit bee11dc78f
5 changed files with 30 additions and 7 deletions
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4
net/ipv4/netfilter/Kconfig
View File

@ -40,10 +40,6 @@ config NF_TABLES_IPV4
depends on NF_TABLES
tristate "IPv4 nf_tables support"
config NFT_REJECT_IPV4
depends on NF_TABLES_IPV4
tristate "nf_tables IPv4 reject support"
config NFT_CHAIN_ROUTE_IPV4
depends on NF_TABLES_IPV4
tristate "IPv4 nf_tables route chain support"

1
net/ipv4/netfilter/Makefile
View File

@ -28,7 +28,6 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o
obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
obj-$(CONFIG_NF_TABLES_ARP) += nf_tables_arp.o

6
net/netfilter/Kconfig
View File

@ -465,6 +465,12 @@ config NFT_QUEUE
This is required if you intend to use the userspace queueing
infrastructure (also known as NFQUEUE) from nftables.
config NFT_REJECT
depends on NF_TABLES
depends on NF_TABLES_IPV6 || !NF_TABLES_IPV6
default m if NETFILTER_ADVANCED=n
tristate "Netfilter nf_tables reject support"
config NFT_COMPAT
depends on NF_TABLES
depends on NETFILTER_XTABLES

1
net/netfilter/Makefile
View File

@ -77,6 +77,7 @@ obj-$(CONFIG_NFT_CT) += nft_ct.o
obj-$(CONFIG_NFT_LIMIT) += nft_limit.o
obj-$(CONFIG_NFT_NAT) += nft_nat.o
obj-$(CONFIG_NFT_QUEUE) += nft_queue.o
obj-$(CONFIG_NFT_REJECT) += nft_reject.o
obj-$(CONFIG_NFT_RBTREE) += nft_rbtree.o
obj-$(CONFIG_NFT_HASH) += nft_hash.o
obj-$(CONFIG_NFT_COUNTER) += nft_counter.o

25
net/ipv4/netfilter/nft_reject_ipv4.c → net/netfilter/nft_reject.c
View File

@ -1,5 +1,6 @@
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2013 Eric Leblond <eric@regit.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
@ -16,10 +17,16 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/icmp.h>
#include <net/netfilter/ipv4/nf_reject.h>
#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
#include <net/netfilter/ipv6/nf_reject.h>
#endif
struct nft_reject {
enum nft_reject_types type:8;
u8 icmp_code;
u8 family;
};
static void nft_reject_eval(const struct nft_expr *expr,
@ -27,12 +34,25 @@ static void nft_reject_eval(const struct nft_expr *expr,
const struct nft_pktinfo *pkt)
{
struct nft_reject *priv = nft_expr_priv(expr);
struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
icmp_send(pkt->skb, ICMP_DEST_UNREACH, priv->icmp_code, 0);
if (priv->family == NFPROTO_IPV4)
nf_send_unreach(pkt->skb, priv->icmp_code);
#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
else if (priv->family == NFPROTO_IPV6)
nf_send_unreach6(net, pkt->skb, priv->icmp_code,
pkt->hooknum);
#endif
break;
case NFT_REJECT_TCP_RST:
if (priv->family == NFPROTO_IPV4)
nf_send_reset(pkt->skb, pkt->hooknum);
#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
else if (priv->family == NFPROTO_IPV6)
nf_send_reset6(net, pkt->skb, pkt->hooknum);
#endif
break;
}
@ -53,6 +73,7 @@ static int nft_reject_init(const struct nft_ctx *ctx,
if (tb[NFTA_REJECT_TYPE] == NULL)
return -EINVAL;
priv->family = ctx->afi->family;
priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
@ -72,7 +93,7 @@ static 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, priv->type))
if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
goto nla_put_failure;
switch (priv->type) {