• Roland Dreier's avatar
    IB/addr: Fix setting source address in addr6_resolve() · 79e25959
    Roland Dreier authored
    Commit eea40b8f ("infiniband: call ipv6 route lookup via the stub
    interface") introduced a regression in address resolution when connecting
    to IPv6 destination addresses.  The old code called ip6_route_output(),
    while the new code calls ipv6_stub->ipv6_dst_lookup().  The two are almost
    the same, except that ipv6_dst_lookup() also calls ip6_route_get_saddr()
    if the source address is in6addr_any.
    
    This means that the test of ipv6_addr_any(&fl6.saddr) now never succeeds,
    and so we never copy the source address out.  This ends up causing
    rdma_resolve_addr() to fail, because without a resolved source address,
    cma_acquire_dev() will fail to find an RDMA device to use.  For me, this
    causes connecting to an NVMe over Fabrics target via RoCE / IPv6 to fail.
    
    Fix this by copying out fl6.saddr if ipv6_addr_any() is true for the original
    source address passed into addr6_resolve().  We can drop our call to
    ipv6_dev_get_saddr() because ipv6_dst_lookup() already does that work.
    
    Fixes: eea40b8f
    
     ("infiniband: call ipv6 route lookup via the stub interface")
    Cc: <stable@vger.kernel.org> # 3.12+
    Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
    Acked-by: default avatarPaolo Abeni <pabeni@redhat.com>
    Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
    79e25959
addr.c 19.6 KB