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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-kernel@vger.kernel.org Subject: [PATCH net] net: dsa: tag_sja1105: fix source port decoding in vlan_filtering=0 bridge mode Date: Sat, 1 Jul 2023 01:20:10 +0300 Message-Id: <20230630222010.1691671-1-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.34.1 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR0P281CA0182.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:ab::13) To AM0PR04MB6452.eurprd04.prod.outlook.com (2603:10a6:208:16d::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM0PR04MB6452:EE_|DU2PR04MB8552:EE_ X-MS-Office365-Filtering-Correlation-Id: 5b312475-9ca8-4905-cb78-08db79b831e3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: NRIsjJ61weVo75Kz3/zvC1vbltHSaR0tapymMc75wLsNHIZeBxI3WRl3nL7anPZGyARpjhVoLW6KTuPdlvRMzyX25LLL9FkDb+tY/wsh/OkSxanujE5WMu4gjR7nOZacNAPVwbWGjSZ5AW9bielwZ6R+3dke5+neTt5dYOS1vqM/Gxst015hvV+l0PiZGX9KinrZiFgd9aomS9PriY2tGu6jad37dEWWZtSBZO9g+hYrCGuXnCKztFx9xxEuHxiLKmRK65jUoGebGiMIppvgCz1tzE1QCsBpLCB6su6683kQJiVrO4clAM+FXpU7wua2wJYbdY7U/b+2A04kx/QhHbG5iVYPdZMHQDmgxoZa2tTlDadLlFB094QSVRw4n3GYkP4m/nLazPc5AVITV4TciE4KZ9XXG8t8q12bLS05xINz1iDmiMtwYWelN3QA7z9ZPP9KBXV3Rri7CptA3/CGhMj0L+EGm55nsScocwcr31PsMbp/BltAhLkPYaCtegDUADMzCUK/i+cxJ3Tmc491kQLruIf9uvejFrHMSc+wLTy0hmPUB2nccocSntbA1ZgpL8eXIBzySw/cy4AIYAxhZa2mgp2y9bgVXotTeOs14KDWTAglA24qzRvxXq16LfzK X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR04MB6452.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(4636009)(136003)(366004)(39860400002)(376002)(396003)(346002)(451199021)(52116002)(6666004)(6486002)(83380400001)(2616005)(186003)(26005)(1076003)(6506007)(5660300002)(86362001)(8676002)(44832011)(36756003)(2906002)(66946007)(54906003)(66556008)(66476007)(38350700002)(38100700002)(8936002)(316002)(4326008)(6916009)(41300700001)(478600001)(6512007);DIR:OUT;SFP:1101; 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charset="utf-8" There was a regression introduced by the blamed commit, where pinging to a VLAN-unaware bridge would fail with the repeated message "Couldn't decode source port" coming from the tagging protocol driver. When receiving packets with a bridge_vid as determined by dsa_tag_8021q_bridge_join(), dsa_8021q_rcv() will decode: - source_port =3D 0 (which isn't really valid, more like "don't know") - switch_id =3D 0 (which isn't really valid, more like "don't know") - vbid =3D value in range 1-7 Since the blamed patch has reversed the order of the checks, we are now going to believe that source_port !=3D -1 and switch_id !=3D -1, so they're valid, but they aren't. The minimal solution to the problem is to only populate source_port and switch_id with what dsa_8021q_rcv() came up with, if the vbid is zero, i.e. the source port information is trustworthy. Fixes: c1ae02d87689 ("net: dsa: tag_sja1105: always prefer source port info= rmation from INCL_SRCPT") Signed-off-by: Vladimir Oltean Reviewed-by: Simon Horman --- net/dsa/tag_sja1105.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c index 796e4b88f63b..f480ffffa8c3 100644 --- a/net/dsa/tag_sja1105.c +++ b/net/dsa/tag_sja1105.c @@ -531,11 +531,14 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *sk= b, * if available. This allows us to not overwrite a valid source * port and switch ID with zeroes when receiving link-local * frames from a VLAN-unaware bridged port (non-zero vbid) or a - * VLAN-aware bridged port (non-zero vid). + * VLAN-aware bridged port (non-zero vid). Furthermore, the + * tag_8021q source port information is only of trust when the + * vbid is 0 (precise port). Otherwise, tmp_source_port and + * tmp_switch_id will be zeroes. */ - if (source_port =3D=3D -1) + if (vbid =3D=3D 0 && source_port =3D=3D -1) source_port =3D tmp_source_port; - if (switch_id =3D=3D -1) + if (vbid =3D=3D 0 && switch_id =3D=3D -1) switch_id =3D tmp_switch_id; } else if (source_port =3D=3D -1 && switch_id =3D=3D -1) { /* Packets with no source information have no chance of --=20 2.34.1