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29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
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Date: Fri, 31 Jul 2020 19:26:16 +0300
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Subject: [PATCH] net: bridge: clear bridge's private skb space on xmit
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We need to clear all of the bridge private skb variables as they can be
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stale due to the packet being recirculated through the stack and then
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transmitted through the bridge device. Similar memset is already done on
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bridge's input. We've seen cases where proxyarp_replied was 1 on routed
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multicast packets transmitted through the bridge to ports with neigh
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suppress which were getting dropped. Same thing can in theory happen with
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the port isolation bit as well.
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Fixes: 821f1b21cabb ("bridge: add new BR_NEIGH_SUPPRESS port flag to suppress arp and nd flood")
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Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/net/bridge/br_device.c
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+++ b/net/bridge/br_device.c
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@@ -36,6 +36,8 @@ netdev_tx_t br_dev_xmit(struct sk_buff *
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struct ethhdr *eth;
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u16 vid = 0;
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+ memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
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+
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rcu_read_lock();
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nf_ops = rcu_dereference(nf_br_ops);
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if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
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