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Commit 9f535c87 authored by Gergely Risko's avatar Gergely Risko Committed by David S. Miller
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ipv6: fix reachability confirmation with proxy_ndp



When proxying IPv6 NDP requests, the adverts to the initial multicast
solicits are correct and working.  On the other hand, when later a
reachability confirmation is requested (on unicast), no reply is sent.

This causes the neighbor entry expiring on the sending node, which is
mostly a non-issue, as a new multicast request is sent.  There are
routers, where the multicast requests are intentionally delayed, and in
these environments the current implementation causes periodic packet
loss for the proxied endpoints.

The root cause is the erroneous decrease of the hop limit, as this
is checked in ndisc.c and no answer is generated when it's 254 instead
of the correct 255.

Cc: stable@vger.kernel.org
Fixes: 46c7655f ("ipv6: decrease hop limit counter in ip6_forward()")
Signed-off-by: default avatarGergely Risko <gergely.risko@gmail.com>
Tested-by: default avatarGergely Risko <gergely.risko@gmail.com>
Reviewed-by: default avatarDavid Ahern <dsahern@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0ad999c1
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