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 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_uSef... Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038 Cc: stable@vger.kernel.org --- drivers/net/usb/ipheth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c index b09b45382faf..207e59e74935 100644 --- 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)
Hello!
On 19.11.2020 20:24, Yves-Alexis Perez wrote:
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 UDP and ICMP traffic from the
^ "no" missing?
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_uSef... Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038 Cc: stable@vger.kernel.org
[...]
MBR, Sergei
On Thu, 19 Nov 2020 18:24:39 +0100 Yves-Alexis Perez wrote:
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 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_uSef... Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038
Applied to net with the typo fixed, thanks!
On Sat, 2020-11-21 at 14:03 -0800, Jakub Kicinski wrote:
Applied to net with the typo fixed, thanks!
Thanks!
Is there any chance it'll be in 5.10 or will it have to wait for the 5.11 merge window?
Also it should be applied to all supported/stable kernels. I guess that'll have to wait until it's in Linus tree according [1] to but I'm unsure if I need to trigger the action myself or if Greg (or Dave, according to [2]) will do it.
I looked at [3] and it seems that adding the CC: stable in my commit message maybe was an error because it's marked as a Failure, so if there's anything needed from me here, don't hesitate to ask.
[1] https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html [2] https://www.kernel.org/doc/html/latest/networking/netdev-FAQ.html#q-how-can-... [3] https://patchwork.kernel.org/bundle/netdev/stable/?state=*
Regards,
On Tue, 24 Nov 2020 11:41:40 +0100 Yves-Alexis Perez wrote:
On Sat, 2020-11-21 at 14:03 -0800, Jakub Kicinski wrote:
Applied to net with the typo fixed, thanks!
Thanks!
Is there any chance it'll be in 5.10 or will it have to wait for the 5.11 merge window?
It'll be in 5.10-rc6.
Also it should be applied to all supported/stable kernels. I guess that'll have to wait until it's in Linus tree according [1] to but I'm unsure if I need to trigger the action myself or if Greg (or Dave, according to [2]) will do it.
Dave (or someone helping him, like myself) will do it, probably around the time 5.10-rc6 is released.
I looked at [3] and it seems that adding the CC: stable in my commit message maybe was an error because it's marked as a Failure, so if there's anything needed from me here, don't hesitate to ask.
No worries, I stripped the CC and put the patch in Dave's stable queue.
linux-stable-mirror@lists.linaro.org
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Jakub Kicinski -
Sergei Shtylyov -
Yves-Alexis Perez