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Date: Tue, 19 Jun 2012 05:16:29 +0200
From: pablo@...filter.org
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 4/4] netfilter: nfnetlink_queue: fix compilation with NF_CONNTRACK disabled
From: Pablo Neira Ayuso <pablo@...filter.org>
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@...ux-foundation.org>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nfnetlink_queue.h | 43 +++++++++
net/netfilter/Kconfig | 9 ++
net/netfilter/Makefile | 2 +
net/netfilter/nf_conntrack_netlink.c | 11 +--
.../{nfnetlink_queue.c => nfnetlink_queue_core.c} | 49 ++--------
net/netfilter/nfnetlink_queue_ct.c | 97 ++++++++++++++++++++
6 files changed, 164 insertions(+), 47 deletions(-)
create mode 100644 include/net/netfilter/nfnetlink_queue.h
rename net/netfilter/{nfnetlink_queue.c => nfnetlink_queue_core.c} (95%)
create mode 100644 net/netfilter/nfnetlink_queue_ct.c
diff --git a/include/net/netfilter/nfnetlink_queue.h b/include/net/netfilter/nfnetlink_queue.h
new file mode 100644
index 0000000..9f8095c
--- /dev/null
+++ b/include/net/netfilter/nfnetlink_queue.h
@@ -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
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f1a52ba..c19b214 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -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
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 7cc2019..1c5160f 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -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
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 76271a1..31d1d8f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -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
}
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue_core.c
similarity index 95%
rename from net/netfilter/nfnetlink_queue.c
rename to net/netfilter/nfnetlink_queue_core.c
index ff82c79..d36b95e 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -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();
diff --git a/net/netfilter/nfnetlink_queue_ct.c b/net/netfilter/nfnetlink_queue_ct.c
new file mode 100644
index 0000000..68ef550
--- /dev/null
+++ b/net/netfilter/nfnetlink_queue_ct.c
@@ -0,0 +1,97 @@
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@...filter.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);
+}
--
1.7.10
--
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