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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Martin Schiller <ms@dev.tdt.de>,
	Xie He <xie.he.0141@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 06/39] drivers/net/wan/lapbether: Make skb->protocol consistent with the header
Date: Mon, 12 Oct 2020 15:26:36 +0200	[thread overview]
Message-ID: <20201012132628.448339119@linuxfoundation.org> (raw)
In-Reply-To: <20201012132628.130632267@linuxfoundation.org>

From: Xie He <xie.he.0141@gmail.com>

[ Upstream commit 83f9a9c8c1edc222846dc1bde6e3479703e8e5a3 ]

This driver is a virtual driver stacked on top of Ethernet interfaces.

When this driver transmits data on the Ethernet device, the skb->protocol
setting is inconsistent with the Ethernet header prepended to the skb.

This causes a user listening on the Ethernet interface with an AF_PACKET
socket, to see different sll_protocol values for incoming and outgoing
frames, because incoming frames would have this value set by parsing the
Ethernet header.

This patch changes the skb->protocol value for outgoing Ethernet frames,
making it consistent with the Ethernet header prepended. This makes a
user listening on the Ethernet device with an AF_PACKET socket, to see
the same sll_protocol value for incoming and outgoing frames.

Cc: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wan/lapbether.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index c6db9a4e7c457..ef746ba74ab4c 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -201,8 +201,6 @@ static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
 	struct net_device *dev;
 	int size = skb->len;
 
-	skb->protocol = htons(ETH_P_X25);
-
 	ptr = skb_push(skb, 2);
 
 	*ptr++ = size % 256;
@@ -213,6 +211,8 @@ static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
 
 	skb->dev = dev = lapbeth->ethdev;
 
+	skb->protocol = htons(ETH_P_DEC);
+
 	skb_reset_network_header(skb);
 
 	dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
-- 
2.25.1




  parent reply	other threads:[~2020-10-12 13:32 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 13:26 [PATCH 4.4 00/39] 4.4.239-rc1 review Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 01/39] gpio: tc35894: fix up tc35894 interrupt configuration Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 02/39] Input: i8042 - add nopnp quirk for Acer Aspire 5 A515 Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 03/39] drm/amdgpu: restore proper ref count in amdgpu_display_crtc_set_config Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 04/39] net: dec: de2104x: Increase receive ring size for Tulip Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 05/39] rndis_host: increase sleep time in the query-response loop Greg Kroah-Hartman
2020-10-12 13:26 ` Greg Kroah-Hartman [this message]
2020-10-12 13:26 ` [PATCH 4.4 07/39] drivers/net/wan/hdlc: Set skb->protocol before transmitting Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 08/39] nfs: Fix security label length not being reset Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 09/39] clk: samsung: exynos4: mark chipid clock as CLK_IGNORE_UNUSED Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 10/39] iommu/exynos: add missing put_device() call in exynos_iommu_of_xlate() Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 11/39] i2c: cpm: Fix i2c_ram structure Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 12/39] epoll: do not insert into poll queues until all sanity checks are done Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 13/39] epoll: replace ->visited/visited_list with generation count Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 14/39] epoll: EPOLL_CTL_ADD: close the race in decision to take fast path Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 15/39] ep_create_wakeup_source(): dentry name can change under you Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 16/39] netfilter: ctnetlink: add a range check for l3/l4 protonum Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 17/39] fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 18/39] Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 19/39] Revert "ravb: Fixed to be able to unload modules" Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 20/39] fbcon: Fix global-out-of-bounds read in fbcon_get_font() Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 21/39] net: wireless: nl80211: fix out-of-bounds access in nl80211_del_key() Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 22/39] usermodehelper: reset umask to default before executing user process Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 23/39] platform/x86: thinkpad_acpi: initialize tp_nvram_state variable Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 24/39] platform/x86: thinkpad_acpi: re-initialize ACPI buffer size when reuse Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 25/39] driver core: Fix probe_count imbalance in really_probe() Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 26/39] perf top: Fix stdio interface input handling with glibc 2.28+ Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 27/39] sctp: fix sctp_auth_init_hmacs() error path Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 28/39] team: set dev->needed_headroom in team_setup_by_port() Greg Kroah-Hartman
2020-10-12 13:26 ` [PATCH 4.4 29/39] net: team: fix memory leak in __team_options_register Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 30/39] mtd: nand: Provide nand_cleanup() function to free NAND related resources Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 31/39] xfrm: clone XFRMA_REPLAY_ESN_VAL in xfrm_do_migrate Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 32/39] xfrm: clone whole liftime_cur structure " Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 33/39] net: stmmac: removed enabling eee in EEE set callback Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 34/39] xfrm: Use correct address family in xfrm_state_find Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 35/39] bonding: set dev->needed_headroom in bond_setup_by_slave() Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 36/39] rxrpc: Fix rxkad token xdr encoding Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 37/39] rxrpc: Downgrade the BUG() for unsupported token type in rxrpc_read() Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 38/39] rxrpc: Fix server keyring leak Greg Kroah-Hartman
2020-10-12 13:27 ` [PATCH 4.4 39/39] net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails Greg Kroah-Hartman
2020-10-13  8:46 ` [PATCH 4.4 00/39] 4.4.239-rc1 review Naresh Kamboju
2020-10-13 16:38 ` Guenter Roeck
2020-10-13 18:11 ` Pavel Machek
2020-10-14  7:47   ` Greg Kroah-Hartman
2020-10-14 10:18     ` Pavel Machek
2020-10-14  1:43 ` Shuah Khan

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