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    Subject[PATCH 5.17 110/772] ipv6: Dont send rs packets to the interface of ARPHRD_TUNNEL
    Date
    From: jianghaoran <jianghaoran@kylinos.cn>

    [ Upstream commit b52e1cce31ca721e937d517411179f9196ee6135 ]

    ARPHRD_TUNNEL interface can't process rs packets
    and will generate TX errors

    ex:
    ip tunnel add ethn mode ipip local 192.168.1.1 remote 192.168.1.2
    ifconfig ethn x.x.x.x

    ethn: flags=209<UP,POINTOPOINT,RUNNING,NOARP> mtu 1480
    inet x.x.x.x netmask 255.255.255.255 destination x.x.x.x
    inet6 fe80::5efe:ac1e:3cdb prefixlen 64 scopeid 0x20<link>
    tunnel txqueuelen 1000 (IPIP Tunnel)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 3 dropped 0 overruns 0 carrier 0 collisions 0

    Signed-off-by: jianghaoran <jianghaoran@kylinos.cn>
    Link: https://lore.kernel.org/r/20220429053802.246681-1-jianghaoran@kylinos.cn
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    net/ipv6/addrconf.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
    index 0a9e03465001..5ec289e0f2ac 100644
    --- a/net/ipv6/addrconf.c
    +++ b/net/ipv6/addrconf.c
    @@ -4221,7 +4221,8 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
    send_rs = send_mld &&
    ipv6_accept_ra(ifp->idev) &&
    ifp->idev->cnf.rtr_solicits != 0 &&
    - (dev->flags&IFF_LOOPBACK) == 0;
    + (dev->flags & IFF_LOOPBACK) == 0 &&
    + (dev->type != ARPHRD_TUNNEL);
    read_unlock_bh(&ifp->idev->lock);

    /* While dad is in progress mld report's source address is in6_addrany.
    --
    2.35.1


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