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Date: Mon, 12 Dec 2022 23:38:01 -0800 From: David Decotigny <decot+git@...gle.com> To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Nikolay Aleksandrov <razor@...ckwall.org>, David Ahern <dsahern@...nel.org>, "Denis V. Lunev" <den@...nvz.org>, Daniel Borkmann <daniel@...earbox.net>, Chen Zhongjin <chenzhongjin@...wei.com>, David Decotigny <ddecotig@...gle.com>, Yuwei Wang <wangyuweihx@...il.com>, Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>, Thomas Zeitlhofer <thomas.zeitlhofer+lkml@...it.at> Subject: [PATCH v1 1/1] net: neigh: persist proxy config across link flaps From: David Decotigny <ddecotig@...gle.com> Without this patch, the 'ip neigh add proxy' config is lost when the cable or peer disappear, ie. when the link goes down while staying admin up. When the link comes back, the config is never recovered. This patch makes sure that such an nd proxy config survives a switch or cable issue. Signed-off-by: David Decotigny <ddecotig@...gle.com> --- net/core/neighbour.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 952a54763358..5ad7ac674daa 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -426,7 +426,10 @@ static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev, { write_lock_bh(&tbl->lock); neigh_flush_dev(tbl, dev, skip_perm); - pneigh_ifdown_and_unlock(tbl, dev); + if (skip_perm) + write_unlock_bh(&tbl->lock); + else + pneigh_ifdown_and_unlock(tbl, dev); pneigh_queue_purge(&tbl->proxy_queue, dev ? dev_net(dev) : NULL, tbl->family); if (skb_queue_empty_lockless(&tbl->proxy_queue)) -- 2.39.0.rc1.256.g54fd8350bd-goog
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