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Yan Zhai c9faed4c8c ipv6: avoid atomic fragment on GSO packets 
[ Upstream commit 03d6c848bf ]

When the ipv6 stack output a GSO packet, if its gso_size is larger than
dst MTU, then all segments would be fragmented. However, it is possible
for a GSO packet to have a trailing segment with smaller actual size
than both gso_size as well as the MTU, which leads to an "atomic
fragment". Atomic fragments are considered harmful in RFC-8021. An
Existing report from APNIC also shows that atomic fragments are more
likely to be dropped even it is equivalent to a no-op [1].

Add an extra check in the GSO slow output path. For each segment from
the original over-sized packet, if it fits with the path MTU, then avoid
generating an atomic fragment.

Link: https://www.potaroo.net/presentations/2022-03-01-ipv6-frag.pdf [1]
Fixes: b210de4f8c ("net: ipv6: Validate GSO SKB before finish IPv6 processing")
Reported-by: David Wragg <dwragg@cloudflare.com>
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Link: https://lore.kernel.org/r/90912e3503a242dca0bc36958b11ed03a2696e5e.1698156966.git.yan@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-11-20 10:29:17 +01:00
Documentation Documentation: security-bugs.rst: clarify CVE handling 2023-08-11 11:45:34 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
arch x86: Fix .brk attribute in linker script 2023-11-08 11:22:19 +01:00
block block: fix signed int overflow in Amiga partition support 2023-08-30 16:31:46 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto X.509: if signature is unsupported skip validation 2023-09-23 10:48:11 +02:00
drivers ACPI: sysfs: Fix create_pnp_modalias() and create_of_modalias() 2023-11-20 10:29:17 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs nfsd: lock_rename() needs both directories to live on the same fs 2023-11-08 11:22:18 +01:00
include PCI: Prevent xHCI driver from claiming AMD VanGogh USB3 DRD device 2023-11-08 11:22:21 +01:00
init init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init() 2023-08-08 19:49:18 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:18:35 +01:00
kernel genirq/matrix: Exclude managed interrupts in irq_matrix_allocated() 2023-11-20 10:29:16 +01:00
lib kobject: Fix slab-out-of-bounds in fill_kobj_path() 2023-11-08 11:22:17 +01:00
mm vfs: fix readahead(2) on block devices 2023-11-20 10:29:16 +01:00
net ipv6: avoid atomic fragment on GSO packets 2023-11-20 10:29:17 +01:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-08-11 11:45:03 +02:00
scripts modpost: add missing else to the "of" check 2023-10-10 21:45:01 +02:00
security smack: Record transmuting in smk_transmuted 2023-10-10 21:44:59 +02:00
sound ASoC: rt5650: fix the wrong result of key button 2023-11-08 11:22:20 +01:00
tools selftests/ftrace: Add new test case which checks non unique symbol 2023-11-08 11:22:14 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:52:24 +09:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
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.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 4.19.298 2023-11-08 11:22:22 +01:00
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.