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author | Paolo Abeni <pabeni@redhat.com> | 2022-04-14 15:08:16 +0200 |
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committer | Paolo Abeni <pabeni@redhat.com> | 2022-04-14 15:08:16 +0200 |
commit | caf968b483351d8825e68b06d77de5eb618aeb64 (patch) | |
tree | 5718718ae3dd8cfaf28fd56d09b23f86fd343751 /include | |
parent | 9386ebccfc599de5578a278ffb16d90cc696969a (diff) | |
parent | 171cfae6b78c3b73d8cd3d405a63e38f15f363f2 (diff) | |
download | linux-caf968b483351d8825e68b06d77de5eb618aeb64.tar.bz2 |
Merge branch 'rndis_host-handle-bogus-mac-addresses-in-zte-rndis-devices'
Lech Perczak says:
====================
rndis_host: handle bogus MAC addresses in ZTE RNDIS devices
When porting support of ZTE MF286R to OpenWrt [1], it was discovered,
that its built-in LTE modem fails to adjust its target MAC address,
when a random MAC address is assigned to the interface, due to detection of
"locally-administered address" bit. This leads to dropping of ingress
trafficat the host. The modem uses RNDIS as its primary interface,
with some variants exposing both of them simultaneously.
Then it was discovered, that cdc_ether driver contains a fixup for that
exact issue, also appearing on CDC ECM interfaces.
I discussed how to proceed with that with Bjørn Mork at OpenWrt forum [3],
with the first approach would be to trust the locally-administered MAC
again, and add a quirk for the problematic ZTE devices, as suggested by
Kristian Evensen. before [4], but reusing the fixup from cdc_ether looks
like a safer and more generic solution.
Finally, according to Bjørn's suggestion. limit the scope of bogus MAC
addressdetection to ZTE devices, the same way as it is done in cdc_ether,
as this trait wasn't really observed outside of ZTE devices.
Do that for both flavours of RNDIS devices, with interface classes
02/02/ff and e0/01/03, as both types are reported by different modems.
[1] https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=7ac8da00609f42b8aba74b7efc6b0d055b7cef3e
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bfe9b9d2df669a57a95d641ed46eb018e204c6ce
[3] https://forum.openwrt.org/t/problem-with-modem-in-zte-mf286r/120988
[4] https://lore.kernel.org/all/CAKfDRXhDp3heiD75Lat7cr1JmY-kaJ-MS0tt7QXX=s8RFjbpUQ@mail.gmail.com/T/
Cc: Bjørn Mork <bjorn@mork.no>
Cc: Kristian Evensen <kristian.evensen@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
v3: Fixed wrong identifier commit description and whitespace in patch 2.
v2: ensure that MAC fixup is applied to all Ethernet frames in RNDIS
batch, by introducing a driver flag, and integrating the fixup inside
rndis_rx_fixup().
====================
Link: https://lore.kernel.org/r/20220413014416.2306843-1-lech.perczak@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/usb/rndis_host.h | 1 | ||||
-rw-r--r-- | include/linux/usb/usbnet.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/usb/rndis_host.h b/include/linux/usb/rndis_host.h index 809bccd08455..cc42db51bbba 100644 --- a/include/linux/usb/rndis_host.h +++ b/include/linux/usb/rndis_host.h @@ -197,6 +197,7 @@ struct rndis_keepalive_c { /* IN (optionally OUT) */ /* Flags for driver_info::data */ #define RNDIS_DRIVER_DATA_POLL_STATUS 1 /* poll status before control */ +#define RNDIS_DRIVER_DATA_DST_MAC_FIXUP 2 /* device ignores configured MAC address */ extern void rndis_status(struct usbnet *dev, struct urb *urb); extern int diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h index 8336e86ce606..1b4d72d5e891 100644 --- a/include/linux/usb/usbnet.h +++ b/include/linux/usb/usbnet.h @@ -214,6 +214,7 @@ extern int usbnet_ether_cdc_bind(struct usbnet *dev, struct usb_interface *intf) extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *); extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *); extern void usbnet_cdc_status(struct usbnet *, struct urb *); +extern int usbnet_cdc_zte_rx_fixup(struct usbnet *dev, struct sk_buff *skb); /* CDC and RNDIS support the same host-chosen packet filters for IN transfers */ #define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \ |