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netfilter: nfnetlink_queue: fix compilation with NF_CONNTRACK disabled 

In "9cb0176 netfilter: add glue code to integrate nfnetlink_queue and ctnetlink"
the compilation with NF_CONNTRACK disabled is broken. This patch fixes this
issue.

I have moved the conntrack part into nfnetlink_queue_ct.c to avoid
peppering the entire nfnetlink_queue.c code with ifdefs.

I also needed to rename nfnetlink_queue.c to nfnetlink_queue_pkt.c
to update the net/netfilter/Makefile to support conditional compilation
of the conntrack integration.

This patch also adds CONFIG_NETFILTER_QUEUE_CT in case you want to explicitly
disable the integration between nf_conntrack and nfnetlink_queue.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-06-19 02:10:57 +02:00
parent 6e9c2db3aa
commit 7c62234547
6 changed files with 164 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
include/net/netfilter/nfnetlink_queue.h Normal file
View File

@ -0,0 +1,43 @@
#ifndef _NET_NFNL_QUEUE_H_
#define _NET_NFNL_QUEUE_H_
#include <linux/netfilter/nf_conntrack_common.h>
struct nf_conn;
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
enum ip_conntrack_info *ctinfo);
struct nf_conn *nfqnl_ct_parse(const struct sk_buff *skb,
const struct nlattr *attr,
enum ip_conntrack_info *ctinfo);
int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo);
void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff);
#else
inline struct nf_conn *
nfqnl_ct_get(struct sk_buff *entskb, size_t *size, enum ip_conntrack_info *ctinfo)
{
return NULL;
}
inline struct nf_conn *nfqnl_ct_parse(const struct sk_buff *skb,
const struct nlattr *attr,
enum ip_conntrack_info *ctinfo)
{
return NULL;
}
inline int
nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
return 0;
}
inline void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
}
#endif /* NF_CONNTRACK */
#endif

9
net/netfilter/Kconfig
View File

@ -340,6 +340,7 @@ config NF_CT_NETLINK_HELPER
select NETFILTER_NETLINK
depends on NF_CT_NETLINK
depends on NETFILTER_NETLINK_QUEUE
depends on NETFILTER_NETLINK_QUEUE_CT
depends on NETFILTER_ADVANCED
help
This option enables the user-space connection tracking helpers
@ -347,6 +348,14 @@ config NF_CT_NETLINK_HELPER
If unsure, say `N'.
config NETFILTER_NETLINK_QUEUE_CT
bool "NFQUEUE integration with Connection Tracking"
default n
depends on NETFILTER_NETLINK_QUEUE
help
If this option is enabled, NFQUEUE can include Connection Tracking
information together with the packet is the enqueued via NFNETLINK.
endif # NF_CONNTRACK
# transparent proxy support

2
net/netfilter/Makefile
View File

@ -9,6 +9,8 @@ obj-$(CONFIG_NETFILTER) = netfilter.o
obj-$(CONFIG_NETFILTER_NETLINK) += nfnetlink.o
obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o
nfnetlink_queue-y := nfnetlink_queue_core.o
nfnetlink_queue-$(CONFIG_NETFILTER_NETLINK_QUEUE_CT) += nfnetlink_queue_ct.o
obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o

11
net/netfilter/nf_conntrack_netlink.c
View File

@ -1627,8 +1627,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
return err;
}
#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
static size_t
ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
{
@ -1762,7 +1761,7 @@ static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
.seq_adjust = nf_nat_tcp_seq_adjust,
#endif
};
#endif /* CONFIG_NETFILTER_NETLINK_QUEUE */
#endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
/***********************************************************************
* EXPECT
@ -2568,8 +2567,7 @@ static int __init ctnetlink_init(void)
pr_err("ctnetlink_init: cannot register pernet operations\n");
goto err_unreg_exp_subsys;
}
#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
/* setup interaction between nf_queue and nf_conntrack_netlink. */
RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
#endif
@ -2590,8 +2588,7 @@ static void __exit ctnetlink_exit(void)
unregister_pernet_subsys(&ctnetlink_net_ops);
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
nfnetlink_subsys_unregister(&ctnl_subsys);
#if defined(CONFIG_NETFILTER_NETLINK_QUEUE) || \
defined(CONFIG_NETFILTER_NETLINK_QUEUE_MODULE)
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
RCU_INIT_POINTER(nfq_ct_hook, NULL);
#endif
}

49
net/netfilter/nfnetlink_queue.c → net/netfilter/nfnetlink_queue_core.c
View File

@ -30,7 +30,7 @@
#include <linux/list.h>
#include <net/sock.h>
#include <net/netfilter/nf_queue.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nfnetlink_queue.h>
#include <linux/atomic.h>
@ -234,7 +234,6 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
struct sk_buff *entskb = entry->skb;
struct net_device *indev;
struct net_device *outdev;
struct nfq_ct_hook *nfq_ct;
struct nf_conn *ct = NULL;
enum ip_conntrack_info uninitialized_var(ctinfo);
@ -270,17 +269,8 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
break;
}
/* rcu_read_lock()ed by __nf_queue already. */
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct != NULL && (queue->flags & NFQA_CFG_F_CONNTRACK)) {
ct = nf_ct_get(entskb, &ctinfo);
if (ct) {
if (!nf_ct_is_untracked(ct))
size += nfq_ct->build_size(ct);
else
ct = NULL;
}
}
if (queue->flags & NFQA_CFG_F_CONNTRACK)
ct = nfqnl_ct_get(entskb, &size, &ctinfo);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
@ -404,23 +394,8 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
BUG();
}
if (ct) {
struct nlattr *nest_parms;
u_int32_t tmp;
nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (nfq_ct->build(skb, ct) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
tmp = ctinfo;
if (nla_put_u32(skb, NFQA_CT_INFO, htonl(ctinfo)))
goto nla_put_failure;
}
if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
goto nla_put_failure;
nlh->nlmsg_len = skb->tail - old_tail;
return skb;
@ -764,7 +739,6 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
struct nfqnl_instance *queue;
unsigned int verdict;
struct nf_queue_entry *entry;
struct nfq_ct_hook *nfq_ct;
enum ip_conntrack_info uninitialized_var(ctinfo);
struct nf_conn *ct = NULL;
@ -786,13 +760,8 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
return -ENOENT;
rcu_read_lock();
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct != NULL &&
(queue->flags & NFQA_CFG_F_CONNTRACK) && nfqa[NFQA_CT]) {
ct = nf_ct_get(entry->skb, &ctinfo);
if (ct && !nf_ct_is_untracked(ct))
nfq_ct->parse(nfqa[NFQA_CT], ct);
}
if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
if (nfqa[NFQA_PAYLOAD]) {
u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
@ -802,8 +771,8 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
payload_len, entry, diff) < 0)
verdict = NF_DROP;
if (ct && (ct->status & IPS_NAT_MASK) && diff)
nfq_ct->seq_adjust(skb, ct, ctinfo, diff);
if (ct)
nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
}
rcu_read_unlock();

97
net/netfilter/nfnetlink_queue_ct.c Normal file
View File

@ -0,0 +1,97 @@
/*
* (C) 2012 by 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/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <net/netfilter/nf_conntrack.h>
struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
enum ip_conntrack_info *ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nf_conn *ct;
/* rcu_read_lock()ed by __nf_queue already. */
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return NULL;
ct = nf_ct_get(entskb, ctinfo);
if (ct) {
if (!nf_ct_is_untracked(ct))
*size += nfq_ct->build_size(ct);
else
ct = NULL;
}
return ct;
}
struct nf_conn *
nfqnl_ct_parse(const struct sk_buff *skb, const struct nlattr *attr,
enum ip_conntrack_info *ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nf_conn *ct;
/* rcu_read_lock()ed by __nf_queue already. */
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return NULL;
ct = nf_ct_get(skb, ctinfo);
if (ct && !nf_ct_is_untracked(ct))
nfq_ct->parse(attr, ct);
return ct;
}
int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nlattr *nest_parms;
u_int32_t tmp;
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return 0;
nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (nfq_ct->build(skb, ct) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
tmp = ctinfo;
if (nla_put_be32(skb, NFQA_CT_INFO, htonl(tmp)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
struct nfq_ct_hook *nfq_ct;
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return;
if ((ct->status & IPS_NAT_MASK) && diff)
nfq_ct->seq_adjust(skb, ct, ctinfo, diff);
}