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Miller" , Jakub Kicinski , , , CC: Joseph Huang Subject: [PATCH 5/6] bridge: Flood Queries even when mcast_flood is disabled Date: Tue, 4 May 2021 14:22:58 -0400 Message-ID: <20210504182259.5042-6-Joseph.Huang@garmin.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210504182259.5042-1-Joseph.Huang@garmin.com> References: <20210504182259.5042-1-Joseph.Huang@garmin.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: OLAWPA-EXMB2.ad.garmin.com (10.5.144.24) To OLAWPA-EXMB4.ad.garmin.com (10.5.144.25) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e72eb858-ca08-400e-4b5e-08d90f29b5a2 X-MS-TrafficTypeDiagnostic: DM5PR04MB0589: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1417; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: tOXjbgfvlUhzBTBSvi3pl1fo8JSI6ckSYQ0CgGnS5DyvRqaD8ygizSbqyovnGCOa82xgJbxz0sAslZOW2/A1sGNhC8lzIkknnSVdPC85JXB1sWfJ7d7AVzIX+8ZJs8At2GHH4khql2b2dEkcJyWJIo+pDipgwxBDKJbuD62ikGLAYM2iaj+zA4ldJIBR6kdjdnGnspG8xWP74gnrtna5JrJkx9zX16DsgRkKSJDTWZtqbTf2V0xBbU80QzLoqOzO0l/5WHe/ydPeUQitt3FoFdW4g/GVwTQA1L5+3Dk50ntXzkaqv3uxzkD4ZCgiiruP4x9gvYrKPFAFc+9T9UVf7/9ptAPYNPzxk2sgN36qQE77eiqyS5S+GVdLwkWaQjL7dZzhbbiuwy25dqnF5hv38GQXnYYxI4Qiz9WxCSemkjcLkRuumkEsR3ebN0MGpwZd36xckD8JgTgorRsG3wEWJ6fZmFLw13gGjb6Y2z26EeX5t+YnQnZdzHLGsQ2jcsMurqb7Zxt43sS8Gcn0YcWUzHSM7OG9ZUZUfrVFHUHX0ir9jaarroMqtdM0DRRM4QsoY0sd2lJBU6qZzJ6TECg7X71uk5VvsjrVZHBzLgrSP5Rizx5oj2sHEbJS55t6kFgtju5bpss+qXvCgpae1Kq5S1Kvb75nvHwGLqYiY5C+ldA= X-Forefront-Antispam-Report: CIP:204.77.163.244;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:edgetransport.garmin.com;PTR:extedge.garmin.com;CAT:NONE;SFS:(39860400002)(396003)(346002)(376002)(136003)(46966006)(36840700001)(107886003)(7636003)(316002)(1076003)(478600001)(2616005)(70586007)(5660300002)(6666004)(70206006)(186003)(83380400001)(8936002)(110136005)(86362001)(26005)(36756003)(82740400003)(4326008)(426003)(2906002)(7696005)(82310400003)(8676002)(36860700001)(47076005)(336012)(356005);DIR:OUT;SFP:1102; X-OriginatorOrg: garmin.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2021 18:23:26.3994 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e72eb858-ca08-400e-4b5e-08d90f29b5a2 X-MS-Exchange-CrossTenant-Id: 38d0d425-ba52-4c0a-a03e-2a65c8e82e2d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=38d0d425-ba52-4c0a-a03e-2a65c8e82e2d;Ip=[204.77.163.244];Helo=[edgetransport.garmin.com] X-MS-Exchange-CrossTenant-AuthSource: BN7NAM10FT057.eop-nam10.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR04MB0589 X-Proofpoint-ORIG-GUID: MV7wwsIDto4SV8aemqFPnkHtS5spJa4M X-Proofpoint-GUID: MV7wwsIDto4SV8aemqFPnkHtS5spJa4M X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-05-04_12:2021-05-04,2021-05-04 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 bulkscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 mlxlogscore=999 phishscore=0 clxscore=1015 mlxscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2105040121 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Modify the forwarding path so that received Queries are always flooded even when mcast_flood is disabled on a bridge port. In current implementation, when mcast_flood is disabled on a bridge port, Queries received from other Querier will not be forwarded out of that bridge port. This unfortunately broke multicast snooping. Signed-off-by: Joseph Huang --- net/bridge/br_forward.c | 3 ++- net/bridge/br_multicast.c | 3 +++ net/bridge/br_private.h | 3 +++ 3 files changed, 8 insertions(+), 1 deletion(-) diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c index 6e9b049ae521..2fb9b4a78881 100644 --- a/net/bridge/br_forward.c +++ b/net/bridge/br_forward.c @@ -203,7 +203,8 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb, continue; break; case BR_PKT_MULTICAST: - if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev) + if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev && + !BR_INPUT_SKB_CB_FORCE_FLOOD(skb)) continue; break; case BR_PKT_BROADCAST: diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index 719ded3204a0..b7d9c491abe0 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -3238,6 +3238,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br, err = br_ip4_multicast_igmp3_report(br, port, skb, vid); break; case IGMP_HOST_MEMBERSHIP_QUERY: + BR_INPUT_SKB_CB(skb)->force_flood = 1; br_ip4_multicast_query(br, port, skb, vid); break; case IGMP_HOST_LEAVE_MESSAGE: @@ -3300,6 +3301,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, err = br_ip6_multicast_mld2_report(br, port, skb, vid); break; case ICMPV6_MGM_QUERY: + BR_INPUT_SKB_CB(skb)->force_flood = 1; err = br_ip6_multicast_query(br, port, skb, vid); break; case ICMPV6_MGM_REDUCTION: @@ -3322,6 +3324,7 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, BR_INPUT_SKB_CB(skb)->igmp = 0; BR_INPUT_SKB_CB(skb)->mrouters_only = 0; + BR_INPUT_SKB_CB(skb)->force_flood = 0; if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) return 0; diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index 9aa51508ba83..59af599d48eb 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -491,6 +491,7 @@ struct br_input_skb_cb { #ifdef CONFIG_BRIDGE_IGMP_SNOOPING u8 igmp; u8 mrouters_only:1; + u8 force_flood:1; #endif u8 proxyarp_replied:1; u8 src_port_isolated:1; @@ -510,8 +511,10 @@ struct br_input_skb_cb { #ifdef CONFIG_BRIDGE_IGMP_SNOOPING # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) +# define BR_INPUT_SKB_CB_FORCE_FLOOD(__skb) (BR_INPUT_SKB_CB(__skb)->force_flood) #else # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) +# define BR_INPUT_SKB_CB_FORCE_FLOOD(__skb) (0) #endif #define br_printk(level, br, format, args...) \ -- 2.17.1