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Date: Wed, 14 Dec 2022 15:20:59 -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 net-next v2 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> --- v1: initial revision v2: same as v1, except rebased on top of latest net-next, and includes "net-next" in the description 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 f00a79fc301b..f4b65bbbdc32 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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