On Sat, Apr 12, 2025 at 09:16:13PM +0800, 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.
Would be good to explain in the commit message why this is needed when you can instead configure the bridge as a router port. Felix provided useful information on v1: https://lore.kernel.org/netdev/7932cd23-571e-4646-b5dd-467ec8106...@nbd.name/ > > Signed-off-by: Felix Fietkau <n...@nbd.name> > Signed-off-by: Shengyu Qu <wiagn...@outlook.com> > --- > Since Felix didn't send v2 for this patch, I decided to do it by myself. Felix provided his SoB on v2? If not, "Reported-by" might be more appropriate. > > Changes since v1: > - Move to net-next > - Changed code according to Nikolay's advice > --- > 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..aefcc3614373 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)) { The alignment here is off. Also, you can drop the parenthesis. > local_rcv = true; > DEV_STATS_INC(br->dev, multicast); > } > -- > 2.43.0 >
