[PATCH RFC 27/31] net: Make the xfrm sysctls per network namespace.

[Eric W. Biederman]

From: Eric W. Biederman <ebiederm at xmission.com> - unquoted

In particalure I moved:
/proc/sys/net/core/xfrm_aevent_etime
/proc/sys/net/core/xfrm_aevent_rseqth

Signed-off-by: Eric W. Biederman <ebiederm at xmission.com>
---
 include/net/xfrm.h         |    4 ++--
 net/core/sysctl_net_core.c |   37 ++++++++++++++++++-------------------
 net/xfrm/xfrm_state.c      |    8 ++++----
 net/xfrm/xfrm_user.c       |   10 ++++++----
 4 files changed, 30 insertions(+), 29 deletions(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index e476541..9b2e727 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -24,8 +24,8 @@
 	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
 
 extern struct sock *xfrm_nl;
-extern u32 sysctl_xfrm_aevent_etime;
-extern u32 sysctl_xfrm_aevent_rseqth;
+DECLARE_PER_NET(u32, sysctl_xfrm_aevent_etime);
+DECLARE_PER_NET(u32, sysctl_xfrm_aevent_rseqth);
 
 extern struct mutex xfrm_cfg_mutex;
 
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 76f7a29..90f2a39 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -88,24 +88,6 @@ ctl_table core_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec
 	},
-#ifdef CONFIG_XFRM
-	{
-		.ctl_name	= NET_CORE_AEVENT_ETIME,
-		.procname	= "xfrm_aevent_etime",
-		.data		= &sysctl_xfrm_aevent_etime,
-		.maxlen		= sizeof(u32),
-		.mode		= 0644,
-		.proc_handler	= &proc_dointvec
-	},
-	{
-		.ctl_name	= NET_CORE_AEVENT_RSEQTH,
-		.procname	= "xfrm_aevent_rseqth",
-		.data		= &sysctl_xfrm_aevent_rseqth,
-		.maxlen		= sizeof(u32),
-		.mode		= 0644,
-		.proc_handler	= &proc_dointvec
-	},
-#endif /* CONFIG_XFRM */
 #endif /* CONFIG_NET */
 	{
 		.ctl_name	= NET_CORE_SOMAXCONN,
@@ -127,6 +109,23 @@ ctl_table core_table[] = {
 };
 
 DEFINE_PER_NET(struct ctl_table, multi_core_table[]) = {
-	/* Stub for holding per network namespace sysctls */
+#ifdef CONFIG_XFRM
+	{
+		.ctl_name	= NET_CORE_AEVENT_ETIME,
+		.procname	= "xfrm_aevent_etime",
+		.data		= &__per_net_base(sysctl_xfrm_aevent_etime),
+		.maxlen		= sizeof(u32),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
+	{
+		.ctl_name	= NET_CORE_AEVENT_RSEQTH,
+		.procname	= "xfrm_aevent_rseqth",
+		.data		= &__per_net_base(sysctl_xfrm_aevent_rseqth),
+		.maxlen		= sizeof(u32),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
+#endif /* CONFIG_XFRM */
 	{}
 };
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index fdb08d9..3304a2d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -27,11 +27,11 @@
 struct sock *xfrm_nl;
 EXPORT_SYMBOL(xfrm_nl);
 
-u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
-EXPORT_SYMBOL(sysctl_xfrm_aevent_etime);
+DEFINE_PER_NET(u32, sysctl_xfrm_aevent_etime) = XFRM_AE_ETIME;
+EXPORT_PER_NET_SYMBOL(sysctl_xfrm_aevent_etime);
 
-u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
-EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);
+DEFINE_PER_NET(u32, sysctl_xfrm_aevent_rseqth) = XFRM_AE_SEQT_SIZE;
+EXPORT_PER_NET_SYMBOL(sysctl_xfrm_aevent_rseqth);
 
 /* Each xfrm_state may be linked to two tables:
 
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 55affa7..15e962b 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -375,7 +375,8 @@ error:
 	return err;
 }
 
-static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
+static struct xfrm_state *xfrm_state_construct(net_t net,
+					       struct xfrm_usersa_info *p,
 					       struct rtattr **xfrma,
 					       int *errp)
 {
@@ -411,9 +412,9 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
 		goto error;
 
 	x->km.seq = p->seq;
-	x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
+	x->replay_maxdiff = per_net(sysctl_xfrm_aevent_rseqth, net);
 	/* sysctl_xfrm_aevent_etime is in 100ms units */
-	x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
+	x->replay_maxage = (per_net(sysctl_xfrm_aevent_etime, net)*HZ)/XFRM_AE_ETH_M;
 	x->preplay.bitmap = 0;
 	x->preplay.seq = x->replay.seq+x->replay_maxdiff;
 	x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
@@ -437,6 +438,7 @@ error_no_put:
 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 		struct rtattr **xfrma)
 {
+	net_t net = skb->sk->sk_net;
 	struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
 	struct xfrm_state *x;
 	int err;
@@ -446,7 +448,7 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err)
 		return err;
 
-	x = xfrm_state_construct(p, xfrma, &err);
+	x = xfrm_state_construct(net, p, xfrma, &err);
 	if (!x)
 		return err;
 
-- 
1.4.4.1.g278f