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44 lines
1.9 KiB
44 lines
1.9 KiB
From: Yves-Alexis Perez <corsac@corsac.net>
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Subject: [PATCH] usbnet: ipheth: fix connectivity with iOS 14
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Date: Thu, 19 Nov 2020 18:24:39 +0100
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Archived-At: <https://lore.kernel.org/stable/20201119172439.94988-1-corsac@corsac.net/>
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List-Post: <mailto:stable@vger.kernel.org>
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Starting with iOS 14 released in September 2020, connectivity using the
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personal hotspot USB tethering function of iOS devices is broken.
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Communication between the host and the device (for example ICMP traffic
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or DNS resolution using the DNS service running in the device itself)
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works fine, but communication to endpoints further away doesn't work.
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Investigation on the matter shows that UDP and ICMP traffic from the
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tethered host is reaching the Internet at all. For TCP traffic there are
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exchanges between tethered host and server but packets are modified in
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transit leading to impossible communication.
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After some trials Matti Vuorela discovered that reducing the URB buffer
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size by two bytes restored the previous behavior. While a better
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solution might exist to fix the issue, since the protocol is not
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publicly documented and considering the small size of the fix, let's do
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that.
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Tested-by: Matti Vuorela <matti.vuorela@bitfactor.fi>
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Signed-off-by: Yves-Alexis Perez <corsac@corsac.net>
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Link: https://lore.kernel.org/linux-usb/CAAn0qaXmysJ9vx3ZEMkViv_B19ju-_ExN8Yn_uSefxpjS6g4Lw@mail.gmail.com/
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Link: https://github.com/libimobiledevice/libimobiledevice/issues/1038
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Cc: stable@vger.kernel.org
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---
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drivers/net/usb/ipheth.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/net/usb/ipheth.c
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+++ b/drivers/net/usb/ipheth.c
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@@ -70,7 +70,7 @@
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#define IPHETH_USBINTF_SUBCLASS 253
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#define IPHETH_USBINTF_PROTO 1
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-#define IPHETH_BUF_SIZE 1516
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+#define IPHETH_BUF_SIZE 1514
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#define IPHETH_IP_ALIGN 2 /* padding at front of URB */
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#define IPHETH_TX_TIMEOUT (5 * HZ)
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