119 lines
4.3 KiB
Diff
119 lines
4.3 KiB
Diff
From 69a9efb689b43fedf5f19431f1889aa6b8d35d55 Mon Sep 17 00:00:00 2001
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From: Lech Perczak <lech.perczak@gmail.com>
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Date: Fri, 1 Apr 2022 22:04:01 +0200
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Subject: [PATCH 2/3] rndis_host: enable the bogus MAC fixup for ZTE devices
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from cdc_ether
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Certain ZTE modems, namely: MF823. MF831, MF910, built-in modem from
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MF286R, expose both CDC-ECM and RNDIS network interfaces.
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They have a trait of ignoring the locally-administered MAC address
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configured on the interface both in CDC-ECM and RNDIS part,
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and this leads to dropping of incoming traffic by the host.
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However, the workaround was only present in CDC-ECM, and MF286R
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explicitly requires it in RNDIS mode.
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Re-use the workaround in rndis_host as well, to fix operation of MF286R
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module, some versions of which expose only the RNDIS interface. Do so by
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introducing new flag, RNDIS_DRIVER_DATA_DST_MAC_FIXUP, and testing for it
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in rndis_rx_fixup. This is required, as RNDIS uses frame batching, and all
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of the packets inside the batch need the fixup. This might introduce a
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performance penalty, because test is done for every returned Ethernet
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frame.
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Apply the workaround to both "flavors" of RNDIS interfaces, as older ZTE
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modems, like MF823 found in the wild, report the USB_CLASS_COMM class
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interfaces, while MF286R reports USB_CLASS_WIRELESS_CONTROLLER.
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Suggested-by: Bjørn Mork <bjorn@mork.no>
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Cc: Kristian Evensen <kristian.evensen@gmail.com>
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Cc: Oliver Neukum <oliver@neukum.org>
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Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
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---
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drivers/net/usb/rndis_host.c | 32 ++++++++++++++++++++++++++++++++
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include/linux/usb/rndis_host.h | 1 +
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2 files changed, 33 insertions(+)
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--- a/drivers/net/usb/rndis_host.c
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+++ b/drivers/net/usb/rndis_host.c
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@@ -486,10 +486,14 @@ EXPORT_SYMBOL_GPL(rndis_unbind);
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*/
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int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
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{
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+ bool dst_mac_fixup;
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+
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/* This check is no longer done by usbnet */
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if (skb->len < dev->net->hard_header_len)
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return 0;
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+ dst_mac_fixup = !!(dev->driver_info->data & RNDIS_DRIVER_DATA_DST_MAC_FIXUP);
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+
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/* peripheral may have batched packets to us... */
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while (likely(skb->len)) {
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struct rndis_data_hdr *hdr = (void *)skb->data;
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@@ -524,10 +528,17 @@ int rndis_rx_fixup(struct usbnet *dev, s
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break;
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skb_pull(skb, msg_len - sizeof *hdr);
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skb_trim(skb2, data_len);
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+
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+ if (unlikely(dst_mac_fixup))
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+ usbnet_cdc_zte_rx_fixup(dev, skb2);
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+
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usbnet_skb_return(dev, skb2);
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}
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/* caller will usbnet_skb_return the remaining packet */
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+ if (unlikely(dst_mac_fixup))
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+ usbnet_cdc_zte_rx_fixup(dev, skb);
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+
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return 1;
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}
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EXPORT_SYMBOL_GPL(rndis_rx_fixup);
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@@ -601,6 +612,17 @@ static const struct driver_info rndis_po
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.tx_fixup = rndis_tx_fixup,
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};
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+static const struct driver_info zte_rndis_info = {
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+ .description = "ZTE RNDIS device",
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+ .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
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+ .data = RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
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+ .bind = rndis_bind,
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+ .unbind = rndis_unbind,
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+ .status = rndis_status,
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+ .rx_fixup = rndis_rx_fixup,
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+ .tx_fixup = rndis_tx_fixup,
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+};
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+
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/*-------------------------------------------------------------------------*/
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static const struct usb_device_id products [] = {
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@@ -610,6 +632,16 @@ static const struct usb_device_id produc
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USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
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.driver_info = (unsigned long) &rndis_poll_status_info,
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}, {
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+ /* ZTE WWAN modules */
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+ USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
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+ USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
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+ .driver_info = (unsigned long)&zte_rndis_info,
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+}, {
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+ /* ZTE WWAN modules, ACM flavour */
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+ USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
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+ USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
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+ .driver_info = (unsigned long)&zte_rndis_info,
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+}, {
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/* Hytera Communications DMR radios' "Radio to PC Network" */
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USB_VENDOR_AND_INTERFACE_INFO(0x238b,
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USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
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--- a/include/linux/usb/rndis_host.h
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+++ b/include/linux/usb/rndis_host.h
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@@ -197,6 +197,7 @@ struct rndis_keepalive_c { /* IN (option
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/* Flags for driver_info::data */
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#define RNDIS_DRIVER_DATA_POLL_STATUS 1 /* poll status before control */
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+#define RNDIS_DRIVER_DATA_DST_MAC_FIXUP 2 /* device ignores configured MAC address */
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extern void rndis_status(struct usbnet *dev, struct urb *urb);
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extern int
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