From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
To: mptcp@lists.linux.dev, Mat Martineau <martineau@kernel.org>,
Geliang Tang <geliang@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Gregory Detal <gregory.detal@gmail.com>,
stable@vger.kernel.org,
"Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Subject: [PATCH net] mptcp: only allow set existing scheduler for net.mptcp.scheduler
Date: Mon, 06 May 2024 17:35:28 +0200 [thread overview]
Message-ID: <20240506-upstream-net-20240506-mptcp-sched-exist-v1-1-2ed1529e521e@kernel.org> (raw)
From: Gregory Detal <gregory.detal@gmail.com>
The current behavior is to accept any strings as inputs, this results in
an inconsistent result where an unexisting scheduler can be set:
# sysctl -w net.mptcp.scheduler=notdefault
net.mptcp.scheduler = notdefault
This patch changes this behavior by checking for existing scheduler
before accepting the input.
Fixes: e3b2870b6d22 ("mptcp: add a new sysctl scheduler")
Cc: stable@vger.kernel.org
Signed-off-by: Gregory Detal <gregory.detal@gmail.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Tested-by: Geliang Tang <geliang@kernel.org>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
net/mptcp/ctrl.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index 13fe0748dde8..2963ba84e2ee 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -96,6 +96,43 @@ static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet)
}
#ifdef CONFIG_SYSCTL
+static int mptcp_set_scheduler(const struct net *net, const char *name)
+{
+ struct mptcp_pernet *pernet = mptcp_get_pernet(net);
+ struct mptcp_sched_ops *sched;
+ int ret = 0;
+
+ rcu_read_lock();
+ sched = mptcp_sched_find(name);
+ if (sched)
+ strscpy(pernet->scheduler, name, MPTCP_SCHED_NAME_MAX);
+ else
+ ret = -ENOENT;
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static int proc_scheduler(struct ctl_table *ctl, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ const struct net *net = current->nsproxy->net_ns;
+ char val[MPTCP_SCHED_NAME_MAX];
+ struct ctl_table tbl = {
+ .data = val,
+ .maxlen = MPTCP_SCHED_NAME_MAX,
+ };
+ int ret;
+
+ strscpy(val, mptcp_get_scheduler(net), MPTCP_SCHED_NAME_MAX);
+
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ ret = mptcp_set_scheduler(net, val);
+
+ return ret;
+}
+
static struct ctl_table mptcp_sysctl_table[] = {
{
.procname = "enabled",
@@ -148,7 +185,7 @@ static struct ctl_table mptcp_sysctl_table[] = {
.procname = "scheduler",
.maxlen = MPTCP_SCHED_NAME_MAX,
.mode = 0644,
- .proc_handler = proc_dostring,
+ .proc_handler = proc_scheduler,
},
{
.procname = "close_timeout",
---
base-commit: a26ff37e624d12e28077e5b24d2b264f62764ad6
change-id: 20240506-upstream-net-20240506-mptcp-sched-exist-6a1b91872a32
Best regards,
--
Matthieu Baerts (NGI0) <matttbe@kernel.org>
next reply other threads:[~2024-05-06 15:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 15:35 Matthieu Baerts (NGI0) [this message]
2024-05-08 0:30 ` [PATCH net] mptcp: only allow set existing scheduler for net.mptcp.scheduler patchwork-bot+netdevbpf
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