* [PATCH mptcp-next] mptcp: restrict values of 'enabled' sysctl
@ 2021-04-28 11:17 Matthieu Baerts
2021-04-28 14:03 ` Matthieu Baerts
0 siblings, 1 reply; 2+ messages in thread
From: Matthieu Baerts @ 2021-04-28 11:17 UTC (permalink / raw)
To: mptcp; +Cc: Matthieu Baerts, Florian Westphal
To avoid confusions, it seems better to parse this sysctl parameter as a
boolean. We use it as a boolean, no need to parse an integer and bring
confusions if we see a value different from 0 and 1, especially with
this parameter name: enabled.
It seems fine to do this modification because the default value is 1
(enabled). Then the only other interesting value to set is 0 (disabled).
All other values would not have changed the default behaviour.
Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
Documentation/networking/mptcp-sysctl.rst | 8 ++++----
net/mptcp/ctrl.c | 8 +++++---
2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/Documentation/networking/mptcp-sysctl.rst b/Documentation/networking/mptcp-sysctl.rst
index 6af0196c4297..3b352e5f6300 100644
--- a/Documentation/networking/mptcp-sysctl.rst
+++ b/Documentation/networking/mptcp-sysctl.rst
@@ -7,13 +7,13 @@ MPTCP Sysfs variables
/proc/sys/net/mptcp/* Variables
===============================
-enabled - INTEGER
+enabled - BOOLEAN
Control whether MPTCP sockets can be created.
- MPTCP sockets can be created if the value is nonzero. This is
- a per-namespace sysctl.
+ MPTCP sockets can be created if the value is 1. This is a
+ per-namespace sysctl.
- Default: 1
+ Default: 1 (enabled)
add_addr_timeout - INTEGER (seconds)
Set the timeout after which an ADD_ADDR control message will be
diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 96ba616f59bf..08c152199b89 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -17,7 +17,7 @@ static int mptcp_pernet_id;
struct mptcp_pernet {
struct ctl_table_header *ctl_table_hdr;
- int mptcp_enabled;
+ u8 mptcp_enabled;
unsigned int add_addr_timeout;
};
@@ -39,12 +39,14 @@ unsigned int mptcp_get_add_addr_timeout(struct net *net)
static struct ctl_table mptcp_sysctl_table[] = {
{
.procname = "enabled",
- .maxlen = sizeof(int),
+ .maxlen = sizeof(u8),
.mode = 0644,
/* users with CAP_NET_ADMIN or root (not and) can change this
* value, same as other sysctl or the 'net' tree.
*/
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dou8vec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE
},
{
.procname = "add_addr_timeout",
--
2.30.2
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