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[78.154.15.142]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43f2066d109sm207839905e9.20.2025.04.15.02.39.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Apr 2025 02:39:59 -0700 (PDT) Message-ID: <8b338c8b-9514-43e4-b1b8-3240b3bde798@blackwall.org> Date: Tue, 15 Apr 2025 12:39:58 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v3] net: bridge: locally receive all multicast packets if IFF_ALLMULTI is set To: Shengyu Qu , idosch@nvidia.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, bridge@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Felix Fietkau References: Content-Language: en-US From: Nikolay Aleksandrov In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/14/25 13:56, Shengyu Qu wrote: > If multicast snooping is enabled, multicast packets may not always end up > on the local bridge interface, if the host is not a member of the multicast > group. Similar to how IFF_PROMISC allows all packets to be received > locally, let IFF_ALLMULTI allow all multicast packets to be received. > > OpenWrt uses a user space daemon for DHCPv6/RA/NDP handling, and in relay > mode it sets the ALLMULTI flag in order to receive all relevant queries on > the network. > > This works for normal network interfaces and non-snooping bridges, but not > snooping bridges (unless multicast routing is enabled). > > Reported-by: Felix Fietkau > Closes:https://github.com/openwrt/openwrt/issues/15857#issuecomment-2662851243 > Signed-off-by: Shengyu Qu > --- > Changes since v1: > - Move to net-next > - Changed code according to Nikolay's advice > > Changes since v2: > - Fix alignment > - Remove redundant parenthesis > - Add more infomation in commit message > --- > net/bridge/br_input.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c > index 232133a0fd21..5f6ac9bf1527 100644 > --- a/net/bridge/br_input.c > +++ b/net/bridge/br_input.c > @@ -189,7 +189,8 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb > if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) && > br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst)) { > if ((mdst && mdst->host_joined) || > - br_multicast_is_router(brmctx, skb)) { > + br_multicast_is_router(brmctx, skb) || > + br->dev->flags & IFF_ALLMULTI) { > local_rcv = true; > DEV_STATS_INC(br->dev, multicast); > } Thanks, Acked-by: Nikolay Aleksandrov