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From: Jakub Kicinski <kuba@kernel.org>
To: Yves-Alexis Perez <corsac@corsac.net>
Cc: "David S. Miller" <davem@davemloft.net>,
	Martin Habets <mhabets@solarflare.com>,
	Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
	Shannon Nelson <snelson@pensando.io>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	linux-usb@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Matti Vuorela <matti.vuorela@bitfactor.fi>,
	stable@vger.kernel.org
Subject: Re: [PATCH] usbnet: ipheth: fix connectivity with iOS 14
Date: Sat, 21 Nov 2020 14:03:11 -0800
Message-ID: <20201121140311.42585c68@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <20201119172439.94988-1-corsac@corsac.net>

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_uSefxpjS6g4Lw@mail.gmail.com/
> Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038

Applied to net with the typo fixed, thanks!

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-27 14:14 /net/usb/ipheth.c incompatibility with Apple " Kiran
2020-09-28 17:50 ` Greg KH
2020-10-11  9:12   ` Yves-Alexis Perez
2020-11-19 17:24 ` [PATCH] usbnet: ipheth: fix connectivity with " Yves-Alexis Perez
2020-11-20  9:15   ` Sergei Shtylyov
2020-11-20 16:56     ` Yves-Alexis Perez
2020-11-21 22:03   ` Jakub Kicinski [this message]
2020-11-24 10:41     ` Yves-Alexis Perez
2020-11-24 16:39       ` Jakub Kicinski
2021-02-21 10:42 Sam Bingner
2021-02-22 12:09 ` Oliver Neukum

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