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    Subject[PATCH 5.9 12/46] usbnet: ipheth: fix connectivity with iOS 14
    Date
    From: Yves-Alexis Perez <corsac@corsac.net>

    [ Upstream commit f33d9e2b48a34e1558b67a473a1fc1d6e793f93c ]

    Starting with iOS 14 released in September 2020, connectivity using the
    personal hotspot USB tethering function of iOS devices is broken.

    Communication between the host and the device (for example ICMP traffic
    or DNS resolution using the DNS service running in the device itself)
    works fine, but communication to endpoints further away doesn't work.

    Investigation on the matter shows that no UDP and ICMP traffic from the
    tethered host is reaching the Internet at all. For TCP traffic there are
    exchanges between tethered host and server but packets are modified in
    transit leading to impossible communication.

    After some trials Matti Vuorela discovered that reducing the URB buffer
    size by two bytes restored the previous behavior. While a better
    solution might exist to fix the issue, since the protocol is not
    publicly documented and considering the small size of the fix, let's do
    that.

    Tested-by: Matti Vuorela <matti.vuorela@bitfactor.fi>
    Signed-off-by: Yves-Alexis Perez <corsac@corsac.net>
    Link: https://lore.kernel.org/linux-usb/CAAn0qaXmysJ9vx3ZEMkViv_B19ju-_ExN8Yn_uSefxpjS6g4Lw@mail.gmail.com/
    Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038
    Link: https://lore.kernel.org/r/20201119172439.94988-1-corsac@corsac.net
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/usb/ipheth.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/net/usb/ipheth.c
    +++ b/drivers/net/usb/ipheth.c
    @@ -59,7 +59,7 @@
    #define IPHETH_USBINTF_SUBCLASS 253
    #define IPHETH_USBINTF_PROTO 1

    -#define IPHETH_BUF_SIZE 1516
    +#define IPHETH_BUF_SIZE 1514
    #define IPHETH_IP_ALIGN 2 /* padding at front of URB */
    #define IPHETH_TX_TIMEOUT (5 * HZ)


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