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Chengen Du 3dfd84aa72 af_packet: Handle outgoing VLAN packets without hardware offloading 
commit 79eecf631c upstream.

The issue initially stems from libpcap. The ethertype will be overwritten
as the VLAN TPID if the network interface lacks hardware VLAN offloading.
In the outbound packet path, if hardware VLAN offloading is unavailable,
the VLAN tag is inserted into the payload but then cleared from the sk_buff
struct. Consequently, this can lead to a false negative when checking for
the presence of a VLAN tag, causing the packet sniffing outcome to lack
VLAN tag information (i.e., TCI-TPID). As a result, the packet capturing
tool may be unable to parse packets as expected.

The TCI-TPID is missing because the prb_fill_vlan_info() function does not
modify the tp_vlan_tci/tp_vlan_tpid values, as the information is in the
payload and not in the sk_buff struct. The skb_vlan_tag_present() function
only checks vlan_all in the sk_buff struct. In cooked mode, the L2 header
is stripped, preventing the packet capturing tool from determining the
correct TCI-TPID value. Additionally, the protocol in SLL is incorrect,
which means the packet capturing tool cannot parse the L3 header correctly.

Link: https://github.com/the-tcpdump-group/libpcap/issues/1105
Link: https://lore.kernel.org/netdev/20240520070348.26725-1-chengen.du@canonical.com/T/#u
Fixes: 393e52e33c ("packet: deliver VLAN TCI to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Chengen Du <chengen.du@canonical.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20240713114735.62360-1-chengen.du@canonical.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-19 05:32:02 +02:00
arch powerpc/xmon: Fix disassembly CPU feature checks 2024-08-19 05:32:01 +02:00
block block: prevent division by zero in blk_rq_stat_sum() 2024-04-13 12:50:16 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto Revert "crypto: api - Disallow identical driver names" 2024-05-02 16:17:13 +02:00
Documentation hwmon: Introduce SENSOR_DEVICE_ATTR_{RO, RW, WO} and variants 2024-08-19 05:31:56 +02:00
drivers net: netconsole: Disable target before netpoll cleanup 2024-08-19 05:32:02 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs nilfs2: avoid undefined behavior in nilfs_cnt32_ge macro 2024-08-19 05:32:02 +02:00
include hwmon: Introduce SENSOR_DEVICE_ATTR_{RO, RW, WO} and variants 2024-08-19 05:31:56 +02:00
init initramfs: fix populate_initrd_image() section mismatch 2024-04-13 12:50:17 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:18:35 +01:00
kernel tick/broadcast: Make takeover of broadcast hrtimer reliable 2024-08-19 05:32:02 +02:00
lib dyndbg: fix old BUG_ON in >control parser 2024-05-17 11:42:43 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" 2024-07-18 11:39:35 +02:00
net af_packet: Handle outgoing VLAN packets without hardware offloading 2024-08-19 05:32:02 +02:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-08-11 11:45:03 +02:00
scripts kconfig: remove wrong expr_trans_bool() 2024-07-27 10:33:41 +02:00
security smack: Handle SMACK64TRANSMUTE in smack_inode_setsecurity() 2024-04-13 12:50:03 +02:00
sound ALSA: dmaengine_pcm: terminate dmaengine before synchronize 2024-07-27 10:33:42 +02:00
tools perf report: Fix condition in sort__sym_cmp() 2024-08-19 05:31:59 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-13 12:50:03 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS MAINTAINERS: r8169: Update path to the driver 2023-11-08 11:22:19 +01:00
Makefile Linux 4.19.319 2024-07-27 10:33:44 +02:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.