[PATCH ipsec-next v5 04/17] xfrm: sysctl: allow configuration of global default values

[Christian Hopps <chopps@chopps.org>]

From: Christian Hopps <chopps@labn.net>

Add sysctls for the changing the IPTFS default SA values.

Signed-off-by: Christian Hopps <chopps@labn.net>
---
 Documentation/networking/xfrm_sysctl.rst | 30 ++++++++++
 include/net/netns/xfrm.h                 |  6 ++
 net/xfrm/xfrm_sysctl.c                   | 70 ++++++++++++++++--------
 3 files changed, 82 insertions(+), 24 deletions(-)

diff --git a/Documentation/networking/xfrm_sysctl.rst b/Documentation/networking/xfrm_sysctl.rst
index 47b9bbdd0179..4d900c74b405 100644
--- a/Documentation/networking/xfrm_sysctl.rst
+++ b/Documentation/networking/xfrm_sysctl.rst
@@ -9,3 +9,33 @@ XFRM Syscall
 
 xfrm_acq_expires - INTEGER
 	default 30 - hard timeout in seconds for acquire requests
+
+xfrm_iptfs_max_qsize - UNSIGNED INTEGER
+        The default IPTFS max output queue size in octets. The output queue is
+        where received packets destined for output over an IPTFS tunnel are
+        stored prior to being output in aggregated/fragmented form over the
+        IPTFS tunnel.
+
+        Default 1M.
+
+xfrm_iptfs_drop_time - UNSIGNED INTEGER
+        The default IPTFS drop time in microseconds. The drop time is the amount
+        of time before a missing out-of-order IPTFS tunnel packet is considered
+        lost. See also the reorder window.
+
+        Default 1s (1000000).
+
+xfrm_iptfs_init_delay - UNSIGNED INTEGER
+        The default IPTFS initial output delay in microseconds. The initial
+        output delay is the amount of time prior to servicing the output queue
+        after queueing the first packet on said queue. This applies anytime
+        the output queue was previously empty.
+
+        Default 0.
+
+xfrm_iptfs_reorder_window - UNSIGNED INTEGER
+        The default IPTFS reorder window size. The reorder window size dictates
+        the maximum number of IPTFS tunnel packets in a sequence that may arrive
+        out of order.
+
+        Default 3.
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index d489d9250bff..73fce57ab14e 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -66,6 +66,12 @@ struct netns_xfrm {
 	u32			sysctl_aevent_rseqth;
 	int			sysctl_larval_drop;
 	u32			sysctl_acq_expires;
+#if IS_ENABLED(CONFIG_XFRM_IPTFS)
+	u32			sysctl_iptfs_drop_time;
+	u32			sysctl_iptfs_init_delay;
+	u32			sysctl_iptfs_max_qsize;
+	u32			sysctl_iptfs_reorder_window;
+#endif
 
 	u8			policy_default[XFRM_POLICY_MAX];
 
diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c
index ca003e8a0376..b70bb91d6984 100644
--- a/net/xfrm/xfrm_sysctl.c
+++ b/net/xfrm/xfrm_sysctl.c
@@ -10,34 +10,50 @@ static void __net_init __xfrm_sysctl_init(struct net *net)
 	net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE;
 	net->xfrm.sysctl_larval_drop = 1;
 	net->xfrm.sysctl_acq_expires = 30;
+#if IS_ENABLED(CONFIG_XFRM_IPTFS)
+	net->xfrm.sysctl_iptfs_max_qsize = 1024 * 1024; /* 1M */
+	net->xfrm.sysctl_iptfs_drop_time = 1000000; /* 1s */
+	net->xfrm.sysctl_iptfs_init_delay = 0; /* no initial delay */
+	net->xfrm.sysctl_iptfs_reorder_window = 3; /* tcp folks suggested */
+#endif
 }
 
 #ifdef CONFIG_SYSCTL
 static struct ctl_table xfrm_table[] = {
-	{
-		.procname	= "xfrm_aevent_etime",
-		.maxlen		= sizeof(u32),
-		.mode		= 0644,
-		.proc_handler	= proc_douintvec
-	},
-	{
-		.procname	= "xfrm_aevent_rseqth",
-		.maxlen		= sizeof(u32),
-		.mode		= 0644,
-		.proc_handler	= proc_douintvec
-	},
-	{
-		.procname	= "xfrm_larval_drop",
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-	{
-		.procname	= "xfrm_acq_expires",
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
+	{ .procname = "xfrm_aevent_etime",
+	  .maxlen = sizeof(u32),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+	{ .procname = "xfrm_aevent_rseqth",
+	  .maxlen = sizeof(u32),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+	{ .procname = "xfrm_larval_drop",
+	  .maxlen = sizeof(int),
+	  .mode = 0644,
+	  .proc_handler = proc_dointvec },
+	{ .procname = "xfrm_acq_expires",
+	  .maxlen = sizeof(int),
+	  .mode = 0644,
+	  .proc_handler = proc_dointvec },
+#if IS_ENABLED(CONFIG_XFRM_IPTFS)
+	{ .procname = "xfrm_iptfs_drop_time",
+	  .maxlen = sizeof(uint),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+	{ .procname = "xfrm_iptfs_init_delay",
+	  .maxlen = sizeof(uint),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+	{ .procname = "xfrm_iptfs_max_qsize",
+	  .maxlen = sizeof(uint),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+	{ .procname = "xfrm_iptfs_reorder_window",
+	  .maxlen = sizeof(uint),
+	  .mode = 0644,
+	  .proc_handler = proc_douintvec },
+#endif
 };
 
 int __net_init xfrm_sysctl_init(struct net *net)
@@ -54,6 +70,12 @@ int __net_init xfrm_sysctl_init(struct net *net)
 	table[1].data = &net->xfrm.sysctl_aevent_rseqth;
 	table[2].data = &net->xfrm.sysctl_larval_drop;
 	table[3].data = &net->xfrm.sysctl_acq_expires;
+#if IS_ENABLED(CONFIG_XFRM_IPTFS)
+	table[4].data = &net->xfrm.sysctl_iptfs_drop_time;
+	table[5].data = &net->xfrm.sysctl_iptfs_init_delay;
+	table[6].data = &net->xfrm.sysctl_iptfs_max_qsize;
+	table[7].data = &net->xfrm.sysctl_iptfs_reorder_window;
+#endif
 
 	/* Don't export sysctls to unprivileged users */
 	if (net->user_ns != &init_user_ns)
-- 
2.45.2