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b4294bc980
Update patch 642-net-bridge-locally-receive-all-multicast-packets-if-.patch to upstream version and move to backport folder as 625-v6.16-net-bridge-locally-receive-all-multicast-packets-if-.patch because kernel 6.16 already includes it. Link: https://lore.kernel.org/all/OSZPR01MB8434308370ACAFA90A22980798B32@OSZPR01MB8434.jpnprd01.prod.outlook.com/ Link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a496d2f0fd612ab9e10700afe00dc9267bad788b Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com> Link: https://github.com/openwrt/openwrt/pull/19875 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
From a496d2f0fd612ab9e10700afe00dc9267bad788b Mon Sep 17 00:00:00 2001
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From: Shengyu Qu <wiagn233@outlook.com>
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Date: Mon, 14 Apr 2025 18:56:01 +0800
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Subject: net: bridge: locally receive all multicast packets if IFF_ALLMULTI is
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set
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If multicast snooping is enabled, multicast packets may not always end up
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on the local bridge interface, if the host is not a member of the multicast
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group. Similar to how IFF_PROMISC allows all packets to be received
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locally, let IFF_ALLMULTI allow all multicast packets to be received.
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OpenWrt uses a user space daemon for DHCPv6/RA/NDP handling, and in relay
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mode it sets the ALLMULTI flag in order to receive all relevant queries on
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the network.
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This works for normal network interfaces and non-snooping bridges, but not
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snooping bridges (unless multicast routing is enabled).
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Reported-by: Felix Fietkau <nbd@nbd.name>
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Closes: https://github.com/openwrt/openwrt/issues/15857#issuecomment-2662851243
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Signed-off-by: Shengyu Qu <wiagn233@outlook.com>
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Reviewed-by: Ido Schimmel <idosch@nvidia.com>
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Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
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Link: https://patch.msgid.link/OSZPR01MB8434308370ACAFA90A22980798B32@OSZPR01MB8434.jpnprd01.prod.outlook.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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net/bridge/br_input.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/net/bridge/br_input.c
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+++ b/net/bridge/br_input.c
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@@ -184,7 +184,8 @@ int br_handle_frame_finish(struct net *n
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if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
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br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst)) {
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if ((mdst && mdst->host_joined) ||
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- br_multicast_is_router(brmctx, skb)) {
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+ br_multicast_is_router(brmctx, skb) ||
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+ br->dev->flags & IFF_ALLMULTI) {
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local_rcv = true;
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DEV_STATS_INC(br->dev, multicast);
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}
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