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Received: from AS8PR04MB9009.eurprd04.prod.outlook.com (2603:10a6:20b:42d::19) by AM7PR04MB6855.eurprd04.prod.outlook.com (2603:10a6:20b:dc::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5857.17; Wed, 23 Nov 2022 09:44:16 +0000 Received: from AS8PR04MB9009.eurprd04.prod.outlook.com ([fe80::696b:5418:b458:196a]) by AS8PR04MB9009.eurprd04.prod.outlook.com ([fe80::696b:5418:b458:196a%3]) with mapi id 15.20.5857.017; Wed, 23 Nov 2022 09:44:16 +0000 From: Firo Yang To: vyasevich@gmail.com, nhorman@tuxdriver.com, marcelo.leitner@gmail.com Cc: mkubecek@suse.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-sctp@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, firogm@gmail.com, Firo Yang Subject: [PATCH 1/1] sctp: sysctl: referring the correct net namespace Date: Wed, 23 Nov 2022 17:44:06 +0800 Message-Id: <20221123094406.32654-1-firo.yang@suse.com> X-Mailer: git-send-email 2.38.1 X-ClientProxiedBy: TY1PR01CA0184.jpnprd01.prod.outlook.com (2603:1096:403::14) To AS8PR04MB9009.eurprd04.prod.outlook.com (2603:10a6:20b:42d::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB9009:EE_|AM7PR04MB6855:EE_ X-MS-Office365-Filtering-Correlation-Id: cc563c60-001b-4cf4-723d-08dacd374958 X-LD-Processed: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba,ExtFwd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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For instance, Host: sudo sysctl net.sctp.rto_min net.sctp.rto_min = 1000 Container: echo 100 > /mnt/proc-net/sctp/rto_min echo 400 > /mnt/proc-net/sctp/rto_max echo: write error: Invalid argument This is caused by the check made from this'commit 4f3fdf3bc59c ("sctp: add check rto_min and rto_max in sysctl")' When validating the input value, it's always referring the boundary value set for the init_net namespace. Having container's rto_max smaller than host's init_net.sctp.rto_min does make sense. Considering that the rto between two containers on the same host is very likely smaller than it for two hosts. So to fix this problem, just referring the boundary value from the net namespace where the new input value came from shold be enough. Signed-off-by: Firo Yang --- net/sctp/sysctl.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c index b46a416787ec..e167df4dc60b 100644 --- a/net/sctp/sysctl.c +++ b/net/sctp/sysctl.c @@ -429,6 +429,9 @@ static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write, else tbl.data = &net->sctp.rto_min; + if (net != &init_net) + max = net->sctp.rto_max; + ret = proc_dointvec(&tbl, write, buffer, lenp, ppos); if (write && ret == 0) { if (new_value > max || new_value < min) @@ -457,6 +460,9 @@ static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, else tbl.data = &net->sctp.rto_max; + if (net != &init_net) + min = net->sctp.rto_min; + ret = proc_dointvec(&tbl, write, buffer, lenp, ppos); if (write && ret == 0) { if (new_value > max || new_value < min)