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Message-Id: <20180523184254.22599-17-pablo@netfilter.org>
Date: Wed, 23 May 2018 20:42:52 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 16/18] netfilter: add struct nf_nat_hook and use it
Move decode_session() and parse_nat_setup_hook() indirections to struct
nf_nat_hook structure.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/linux/netfilter.h | 21 ++++++++++++++++-----
include/net/netfilter/nf_nat_core.h | 7 -------
net/netfilter/core.c | 8 +++-----
net/netfilter/nf_conntrack_core.c | 5 -----
net/netfilter/nf_conntrack_netlink.c | 10 +++++-----
net/netfilter/nf_nat_core.c | 23 ++++++++++++-----------
6 files changed, 36 insertions(+), 38 deletions(-)
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 75ded6f6eebe..e8d09dc028f6 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -320,18 +320,29 @@ int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
#include <net/flow.h>
-extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
+
+struct nf_conn;
+enum nf_nat_manip_type;
+struct nlattr;
+
+struct nf_nat_hook {
+ int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip,
+ const struct nlattr *attr);
+ void (*decode_session)(struct sk_buff *skb, struct flowi *fl);
+};
+
+extern struct nf_nat_hook __rcu *nf_nat_hook;
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
{
#ifdef CONFIG_NF_NAT_NEEDED
- void (*decodefn)(struct sk_buff *, struct flowi *);
+ struct nf_nat_hook *nat_hook;
rcu_read_lock();
- decodefn = rcu_dereference(nf_nat_decode_session_hook);
- if (decodefn)
- decodefn(skb, fl);
+ nat_hook = rcu_dereference(nf_nat_hook);
+ if (nat_hook->decode_session)
+ nat_hook->decode_session(skb, fl);
rcu_read_unlock();
#endif
}
diff --git a/include/net/netfilter/nf_nat_core.h b/include/net/netfilter/nf_nat_core.h
index c78e9be14b3d..dc7cd0440229 100644
--- a/include/net/netfilter/nf_nat_core.h
+++ b/include/net/netfilter/nf_nat_core.h
@@ -26,11 +26,4 @@ static inline int nf_nat_initialized(struct nf_conn *ct,
return ct->status & IPS_DST_NAT_DONE;
}
-struct nlattr;
-
-extern int
-(*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
- enum nf_nat_manip_type manip,
- const struct nlattr *attr);
-
#endif /* _NF_NAT_CORE_H */
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 1bd844ea1d7c..e0ae4aae96f5 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -574,6 +574,9 @@ void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *)
__rcu __read_mostly;
EXPORT_SYMBOL(ip_ct_attach);
+struct nf_nat_hook __rcu *nf_nat_hook __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_hook);
+
void nf_ct_attach(struct sk_buff *new, const struct sk_buff *skb)
{
void (*attach)(struct sk_buff *, const struct sk_buff *);
@@ -608,11 +611,6 @@ const struct nf_conntrack_zone nf_ct_zone_dflt = {
EXPORT_SYMBOL_GPL(nf_ct_zone_dflt);
#endif /* CONFIG_NF_CONNTRACK */
-#ifdef CONFIG_NF_NAT_NEEDED
-void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
-EXPORT_SYMBOL(nf_nat_decode_session_hook);
-#endif
-
static void __net_init __netfilter_net_init(struct nf_hook_entries **e, int max)
{
int h;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 8b2a8644d955..8d109d750073 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -58,11 +58,6 @@
#include "nf_internals.h"
-int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
- enum nf_nat_manip_type manip,
- const struct nlattr *attr) __read_mostly;
-EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
-
__cacheline_aligned_in_smp spinlock_t nf_conntrack_locks[CONNTRACK_LOCKS];
EXPORT_SYMBOL_GPL(nf_conntrack_locks);
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index d807b8770be3..39327a42879f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1431,11 +1431,11 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr)
{
- typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
+ struct nf_nat_hook *nat_hook;
int err;
- parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
- if (!parse_nat_setup) {
+ nat_hook = rcu_dereference(nf_nat_hook);
+ if (!nat_hook) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
@@ -1446,13 +1446,13 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
}
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
- if (nfnetlink_parse_nat_setup_hook)
+ if (nat_hook->parse_nat_setup)
return -EAGAIN;
#endif
return -EOPNOTSUPP;
}
- err = parse_nat_setup(ct, manip, attr);
+ err = nat_hook->parse_nat_setup(ct, manip, attr);
if (err == -EAGAIN) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 489599b549cf..f4d264676cfe 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -1026,6 +1026,13 @@ static struct pernet_operations nat_net_ops = {
.size = sizeof(struct nat_net),
};
+struct nf_nat_hook nat_hook = {
+ .parse_nat_setup = nfnetlink_parse_nat_setup,
+#ifdef CONFIG_XFRM
+ .decode_session = __nf_nat_decode_session,
+#endif
+};
+
static int __init nf_nat_init(void)
{
int ret, i;
@@ -1057,13 +1064,9 @@ static int __init nf_nat_init(void)
nf_ct_helper_expectfn_register(&follow_master_nat);
- BUG_ON(nfnetlink_parse_nat_setup_hook != NULL);
- RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook,
- nfnetlink_parse_nat_setup);
-#ifdef CONFIG_XFRM
- BUG_ON(nf_nat_decode_session_hook != NULL);
- RCU_INIT_POINTER(nf_nat_decode_session_hook, __nf_nat_decode_session);
-#endif
+ WARN_ON(nf_nat_hook != NULL);
+ RCU_INIT_POINTER(nf_nat_hook, &nat_hook);
+
return 0;
}
@@ -1076,10 +1079,8 @@ static void __exit nf_nat_cleanup(void)
nf_ct_extend_unregister(&nat_extend);
nf_ct_helper_expectfn_unregister(&follow_master_nat);
- RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, NULL);
-#ifdef CONFIG_XFRM
- RCU_INIT_POINTER(nf_nat_decode_session_hook, NULL);
-#endif
+ RCU_INIT_POINTER(nf_nat_hook, NULL);
+
synchronize_rcu();
for (i = 0; i < NFPROTO_NUMPROTO; i++)
--
2.11.0
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