DSS VLANs are pseudo network interfaces representing arbitrary data streams, and specifically not IP. Preventing spurious IP packets can sometimes be a hassle. The kernel will for example send an IPv6 Router Solicit when the interface is brought up unless the user has been careful enough to disable IPv6 first. Such packets forwared to a MBIM DSS session will look like spurious noise to the device, and can cause it to log an error or even malfunction. Drop all IP packets on the designated DSS VLANs to prevent such unwanted spurious transmissions. Cc: Greg Suarez <gsuarez@xxxxxxxxxxxxxx> Reported-by: Arnaud Desmier <adesmier@xxxxxxxxxxx> Signed-off-by: Bjørn Mork <bjorn@xxxxxxx> --- drivers/net/usb/cdc_mbim.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c index dbc19fd945a9..beb8b95160a5 100644 --- a/drivers/net/usb/cdc_mbim.c +++ b/drivers/net/usb/cdc_mbim.c @@ -237,6 +237,8 @@ static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb c[3] = tci; break; case 0x0100: /* VLAN ID 256 - 511 */ + if (is_ip) + goto error; sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN); c = (u8 *)&sign; c[3] = tci; -- 2.0.0.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
