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    Subject[PATCH 4.4 016/342] ipv6/udp: use sticky pktinfo egress ifindex on connect()
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Paolo Abeni <pabeni@redhat.com>

    [ Upstream commit 1cdda91871470f15e79375991bd2eddc6e86ddb1 ]

    Currently, the egress interface index specified via IPV6_PKTINFO
    is ignored by __ip6_datagram_connect(), so that RFC 3542 section 6.7
    can be subverted when the user space application calls connect()
    before sendmsg().
    Fix it by initializing properly flowi6_oif in connect() before
    performing the route lookup.

    Signed-off-by: Paolo Abeni <pabeni@redhat.com>
    Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/ipv6/datagram.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/net/ipv6/datagram.c
    +++ b/net/ipv6/datagram.c
    @@ -162,6 +162,9 @@ ipv4_connected:
    fl6.fl6_dport = inet->inet_dport;
    fl6.fl6_sport = inet->inet_sport;

    + if (!fl6.flowi6_oif)
    + fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
    +
    if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
    fl6.flowi6_oif = np->mcast_oif;
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