Wei Wang cf1ef3f071 net/tcp_fastopen: Disable active side TFO in certain scenarios ... Middlebox firewall issues can potentially cause server's data being blackholed after a successful 3WHS using TFO. Following are the related reports from Apple: https://www.nanog.org/sites/default/files/Paasch_Network_Support.pdf Slide 31 identifies an issue where the client ACK to the server's data sent during a TFO'd handshake is dropped. C ---> syn-data ---> S C <--- syn/ack ----- S C (accept & write) C <---- data ------- S C ----- ACK -> X S [retry and timeout] https://www.ietf.org/proceedings/94/slides/slides-94-tcpm-13.pdf Slide 5 shows a similar situation that the server's data gets dropped after 3WHS. C ---- syn-data ---> S C <--- syn/ack ----- S C ---- ack --------> S S (accept & write) C? X <- data ------ S [retry and timeout] This is the worst failure b/c the client can not detect such behavior to mitigate the situation (such as disabling TFO). Failing to proceed, the application (e.g., SSL library) may simply timeout and retry with TFO again, and the process repeats indefinitely. The proposed solution is to disable active TFO globally under the following circumstances: 1. client side TFO socket detects out of order FIN 2. client side TFO socket receives out of order RST We disable active side TFO globally for 1hr at first. Then if it happens again, we disable it for 2h, then 4h, 8h, ... And we reset the timeout to 1hr if a client side TFO sockets not opened on loopback has successfully received data segs from server. And we examine this condition during close(). The rational behind it is that when such firewall issue happens, application running on the client should eventually close the socket as it is not able to get the data it is expecting. Or application running on the server should close the socket as it is not able to receive any response from client. In both cases, out of order FIN or RST will get received on the client given that the firewall will not block them as no data are in those frames. And we want to disable active TFO globally as it helps if the middle box is very close to the client and most of the connections are likely to fail. Also, add a debug sysctl: tcp_fastopen_blackhole_detect_timeout_sec: the initial timeout to use when firewall blackhole issue happens. This can be set and read. When setting it to 0, it means to disable the active disable logic. Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-04-24 14:27:17 -04:00
..
ABI	Documentation: ABI: testing: sysfs-class-net-qmi: add new qmap mux files description	2017-03-25 20:03:35 -07:00
accounting	tools: move accounting tool from Documentation	2016-09-23 13:07:15 -06:00
acpi	scripts/spelling.txt: add "followings" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
admin-guide	kasan: report only the first error by default	2017-03-31 17:13:30 -07:00
aoe
arm	arm: sunxi: add support for V3s SoC	2017-01-20 21:31:34 +01:00
arm64	irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065	2017-03-07 14:34:27 +00:00
auxdisplay	samples: move auxdisplay example code from Documentation	2016-09-23 11:52:32 -06:00
backlight
blackfin	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
block	A slightly quieter cycle for documentation this time around.	2017-02-22 18:51:29 -08:00
blockdev	scripts/spelling.txt: add "followings" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
bus-devices
cdrom	cdrom: Make device operations read-only	2017-02-14 08:29:56 -07:00
cgroup-v1	Merge branch 'for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2017-02-27 21:41:08 -08:00
cma
connector
console
core-api	Documentation: Update CPU hotplug and move it to core-api	2017-01-13 10:32:32 -07:00
cpu-freq	A slightly quieter cycle for documentation this time around.	2017-02-22 18:51:29 -08:00
cpuidle
cris
crypto	crypto: doc - fix typo	2017-02-15 13:23:49 +08:00
dev-tools	scripts/spelling.txt: add "disble(d)" pattern and fix typo instances	2017-03-09 17:01:09 -08:00
device-mapper	scripts/spelling.txt: add "explictely" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
devicetree	mdio_bus: Issue GPIO RESET to PHYs.	2017-04-24 12:40:24 -04:00
dmaengine	dmaengine: Documentation: Fix typo in pxa_dma.txt	2016-11-14 08:14:24 +05:30
doc-guide	docs-rst: parse-headers.pl: cleanup the documentation	2016-11-30 17:08:09 -07:00
DocBook	A few fixes for the docs tree, including one for a 4.11 build regression.	2017-03-04 11:32:18 -08:00
driver-api	cfg80211: add intro to documentation	2017-03-31 09:15:46 +02:00
driver-model	irqdesc: Add a resource managed version of irq_alloc_descs()	2017-02-10 14:39:20 +01:00
early-userspace
EDID
extcon	extcon: int3496: Add GPIO ACPI mapping table	2017-03-22 18:29:46 +09:00
fault-injection
fb
features	2nd round of ARC udpates for 4.10rc1	2016-12-23 10:22:47 -08:00
filesystems	Documentation/filesystems: fix documentation for ->getattr()	2017-04-03 01:05:56 -04:00
firmware_class	firmware: revamp firmware documentation	2017-01-11 09:42:59 +01:00
fmc
fpga	fpga: Add scatterlist based programming	2017-02-10 15:20:44 +01:00
frv	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
gpio	gpio: random documentation update	2017-01-31 15:43:05 +01:00
gpu	Less anger inducing pull request for 4.11	2017-02-23 18:58:18 -08:00
hid
hwmon	A slightly quieter cycle for documentation this time around.	2017-02-22 18:51:29 -08:00
i2c	i2c: i801: Add support for Intel Gemini Lake	2017-02-09 17:39:16 +01:00
ia64	selftests: move ia64 tests from Documentation/ia64	2016-09-20 09:58:12 -06:00
ide
iio	iio: Documentation: Correct the path used to create triggers.	2016-10-01 00:49:58 -06:00
infiniband	IB/hfi1: Document new sysfs entries for hfi1 driver	2016-10-02 08:42:19 -04:00
input	Documentation: input: fix path to input code definitions	2017-02-12 15:19:00 -07:00
ioctl	rpmsg updates for v4.11	2017-02-23 09:41:03 -08:00
isdn	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
kbuild	Kconfig: Introduce the "imply" keyword	2016-11-16 09:26:33 +01:00
kdump	Documentation: kdump: Add description of enable multi-cpus support	2016-09-20 18:02:54 -06:00
laptops	platform/x86: thinkpad_acpi: Add support for X1 Yoga (2016) Tablet Mode	2016-12-13 09:29:06 -08:00
leds	leds: class: Add new optional brightness_hw_changed attribute	2017-01-29 19:59:42 +01:00
livepatch	A slightly quieter cycle for documentation this time around.	2017-02-22 18:51:29 -08:00
locking	locking/ww_mutex/Documentation: Update the design document	2017-01-14 11:14:55 +01:00
m68k	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
md	MD: add doc for raid5-cache	2017-02-13 09:17:54 -08:00
media	A few fixes for the docs tree, including one for a 4.11 build regression.	2017-03-04 11:32:18 -08:00
memory-devices
metag
mic	samples: move mic/mpssd example code from Documentation	2016-09-20 12:38:48 -06:00
mips
misc-devices	samples: move misc-devices/mei example code from Documentation	2016-09-23 11:51:43 -06:00
mmc
mn10300
mtd	spi-nor: Add support for Intel SPI serial flash controller	2017-01-03 17:33:36 +00:00
namespaces
netlabel
networking	net/tcp_fastopen: Disable active side TFO in certain scenarios	2017-04-24 14:27:17 -04:00
nfc
nios2
nvdimm
nvmem
parisc
PCI	A few fixes for the docs tree, including one for a 4.11 build regression.	2017-03-04 11:32:18 -08:00
pcmcia	tools: move pcmcia crc32hash tool from Documentation	2016-09-23 13:07:27 -06:00
perf	perf: add qcom l2 cache perf events driver	2017-02-08 19:32:24 +00:00
phy
platform
power	More power management updates for v4.11-rc1	2017-03-02 17:33:52 -08:00
powerpc	powerpc updates for 4.9	2016-10-07 20:19:31 -07:00
pps	Doc: clarify source of jitter in USB1.1, and USB2.0	2017-01-04 14:40:52 -07:00
prctl	selftests: move prctl tests from Documentation/prctl	2016-09-20 09:09:09 -06:00
process	Documentation: stable-kernel-rules: fix stable-tag format	2017-04-08 17:33:31 +02:00
pti
ptp	selftests: move ptp tests from Documentation/ptp	2016-09-20 09:54:38 -06:00
rapidio	rapidio/documentation/mport_cdev: add missing parameter description	2016-09-01 17:52:02 -07:00
RCU	Merge branches 'doc.2017.01.15b', 'dyntick.2017.01.23a', 'fixes.2017.01.23a', 'srcu.2017.01.25a' and 'torture.2017.01.15b' into HEAD	2017-01-25 12:56:05 -08:00
s390	Documentation: Update path to sysrq.txt	2017-03-03 15:48:38 -07:00
scheduler	sched/Documentation/sched-rt-group: Fix incorrect example	2017-01-22 10:34:17 +01:00
scsi	scripts/spelling.txt: add "varible" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
security	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
serial
sh
sound	scripts/spelling.txt: add "followings" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
sparc	Documentation/sparc: Steps for sending break on sunhv console	2017-02-23 08:27:25 -08:00
sphinx	docs: sphinx-extensions: make rstFlatTable work with docutils 0.13	2016-12-18 13:30:29 -07:00
sphinx-static	This is the documentation update pull for the 4.9 merge window.	2016-10-04 13:54:07 -07:00
spi	spi: spi-ep93xx: simplify GPIO chip selects	2017-02-16 20:10:26 +00:00
sysctl	Replace 2 jiffies with sysctl netdev_budget_usecs to enable softirq tuning	2017-04-21 13:22:34 -04:00
target
thermal	Documentation: fix spelling mistakes of "Celcius" -- > "Celsius"	2017-01-04 14:36:17 -07:00
timers	time: Remove CONFIG_TIMER_STATS	2017-02-10 11:15:08 +01:00
trace	perf/core: Rename CONFIG_[UK]PROBE_EVENT to CONFIG_[UK]PROBE_EVENTS	2017-03-01 10:26:39 +01:00
translations	doc/ko_KR/memory-barriers: Update control-dependencies section	2017-03-03 15:54:55 -07:00
usb	A slightly quieter cycle for documentation this time around.	2017-02-22 18:51:29 -08:00
virtual	KVM/ARM Fixes for v4.11-rc6	2017-04-05 16:27:47 +02:00
vm	userfaultfd: non-cooperative: rollback userfaultfd_exit	2017-03-09 17:01:09 -08:00
w1
watchdog	watchdog: Introduce watchdog_stop_on_unregister helper	2017-02-24 14:00:23 -08:00
wimax
x86	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-02-28 11:46:00 -08:00
xtensa
.gitignore
00-INDEX	Documentation: move MD related doc into a separate dir	2017-02-13 09:17:53 -08:00
bcache.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt	cgroup: Fix indenting in PID controller documentation	2017-03-06 14:46:27 -05:00
Changes	docs: add back 'Documentation/Changes' file (as symlink)	2016-12-14 16:30:12 -08:00
circular-buffers.txt	Documentation: circular-buffers: use READ_ONCE()	2016-11-16 16:17:45 -07:00
clk.txt
CodingStyle	doc: re-add CodingStyle and SubmittingPatches	2016-10-24 08:12:35 -02:00
conf.py	Documentation/sphinx: fix primary_domain configuration	2017-03-03 16:12:30 -07:00
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
digsig.txt
DMA-API-HOWTO.txt	Documentation: DMA-API-HOWTO: Fix a typo	2016-09-20 17:58:46 -06:00
DMA-API.txt	dma-mapping: add dma_{map,unmap}_resource	2016-09-26 22:16:41 +05:30
DMA-attributes.txt	common: DMA-mapping: add DMA_ATTR_PRIVILEGED attribute	2017-01-19 15:56:19 +00:00
DMA-ISA-LPC.txt	Documentation: DMA-ISA-LPC.txt	2017-02-12 15:20:07 -07:00
docutils.conf
dontdiff	Documentation: dontdiff: Update with additional entries	2017-01-26 15:08:06 -07:00
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt	gcc-plugins: update architecture list in documentation	2017-03-21 22:20:05 +11:00
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	docs/zh_CN: Add coding-style into docs build system	2017-01-26 15:30:34 -07:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt	Documentation: Fix a typo in IPMI.txt.	2017-01-05 15:01:54 -06:00
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-doc-nano-HOWTO.txt	docs-rst: doc-guide: split the kernel-documentation.rst contents	2016-11-19 10:22:04 -07:00
kernel-per-CPU-kthreads.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
kobject.txt
kprobes.txt
kref.txt
kselftest.txt	scripts/spelling.txt: add "an user" pattern and fix typo instances	2017-02-27 18:43:46 -08:00
ldm.txt
lockup-watchdogs.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
logo.gif
logo.txt
lzo.txt
mailbox.txt
Makefile	samples: move blackfin gptimers-example from Documentation	2016-10-10 07:12:02 -06:00
Makefile.sphinx	Add a target to check broken external links in the Documentation	2017-02-15 15:22:47 -07:00
memory-barriers.txt	doc: Update control-dependencies section of memory-barriers.txt	2017-01-14 21:29:15 -08:00
memory-hotplug.txt	scripts/spelling.txt: add "followings" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt
numastat.txt
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pinctrl.txt	pinctrl: core: Fix pinctrl_register_and_init() with pinctrl_enable()	2017-04-07 01:08:08 +02:00
pnp.txt
preempt-locking.txt
printk-formats.txt
pwm.txt
rbtree.txt
remoteproc.txt	remoteproc: Split driver and consumer dereferencing	2016-10-02 22:50:21 -07:00
rfkill.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
sgi-ioc4.txt
siphash.txt	siphash: implement HalfSipHash1-3 for hash tables	2017-01-09 13:58:57 -05:00
SM501.txt
smsc_ece1099.txt
static-keys.txt	jump_label: Reduce the size of struct static_key	2017-02-15 09:02:26 -05:00
SubmittingPatches	doc: re-add CodingStyle and SubmittingPatches	2016-10-24 08:12:35 -02:00
svga.txt
sync_file.txt	dma-buf: Rename struct fence to dma_fence	2016-10-25 14:40:39 +02:00
this_cpu_ops.txt
unaligned-memory-access.txt	Documentation/unaligned-memory-access.txt: fix incorrect comparison operator	2016-12-27 13:08:42 -07:00
unshare.txt
vfio-mediated-device.txt	vfio-mdev: Make mdev_parent private	2016-12-30 08:13:41 -07:00
vfio.txt
video-output.txt
xillybus.txt
xz.txt
zorro.txt