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Eric Dumazet 86791bbfe5 tcp: implement RFC 5961 3.2 
[ Upstream commit 282f23c6ee ]

Implement the RFC 5691 mitigation against Blind
Reset attack using RST bit.

Idea is to validate incoming RST sequence,
to match RCV.NXT value, instead of previouly accepted
window : (RCV.NXT <= SEG.SEQ < RCV.NXT+RCV.WND)

If sequence is in window but not an exact match, send
a "challenge ACK", so that the other part can resend an
RST with the appropriate sequence.

Add a new sysctl, tcp_challenge_ack_limit, to limit
number of challenge ACK sent per second.

Add a new SNMP counter to count number of challenge acks sent.
(netstat -s | grep TCPChallengeACK)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Kiran Kumar Kella <kkiran@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-11 09:03:48 -08:00
..
ABI
backlight: new driver for the ADP8870 backlight devices
2011-06-15 20:03:59 -07:00
accounting
Documentation: update cgroupfs mount point
2011-06-15 21:52:50 -07:00
acpi
ACPI: Split out custom_method functionality into an own driver
2011-05-29 01:50:40 -04:00
aoe
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
arm
Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into devel-stable
2011-05-25 21:47:48 +01:00
auxdisplay
…
blackfin
Blackfin: document SPI CS limitations with CPHA=0
2010-08-06 12:55:52 -04:00
block
Fix common misspellings
2011-03-31 11:26:23 -03:00
blockdev
cciss: add cciss_tape_cmds module paramter
2011-05-06 08:23:59 -06:00
cdrom
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
cgroups
Documentation: fix cgroup blkio throttle filenames
2011-07-06 13:17:51 -07:00
connector
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
console
doc: fix console doc typo
2010-02-24 13:51:32 +01:00
cpu-freq
[CPUFREQ] Add documentation for sampling_down_factor
2011-03-16 17:54:31 -04:00
cpuidle
…
cris
…
crypto
…
development-process
Documentation: Update stable address
2012-01-12 11:34:54 -08:00
device-mapper
Fix common misspellings
2011-03-31 11:26:23 -03:00
devicetree
Merge branches 'devel', 'devel-stable' and 'fixes' into for-linus
2011-05-27 22:59:57 +01:00
DocBook
Merge git://git.infradead.org/mtd-2.6
2011-05-27 20:06:53 -07:00
driver-model
driver core: remove the driver-model structures from the documentation
2011-05-06 18:01:05 -07:00
dvb
get_dvb_firmware: fix download site for tda10046 firmware
2012-12-03 12:59:15 -08:00
early-userspace
…
fault-injection
lkdtm: add debugfs access and loosen KPROBE ties
2010-03-06 11:26:32 -08:00
fb
Fix common misspellings
2011-03-31 11:26:23 -03:00
filesystems
nilfs2: remove resize from unsupported features list
2011-07-13 16:08:59 +09:00
firmware_class
firmware: Update hotplug script
2010-08-05 13:53:34 -07:00
frv
…
hid
HID: Move hiddev.txt to the new Documentation/hid directory
2011-03-22 11:43:51 +01:00
hwmon
hwmon: (jc42) Add support for AT30TS00, TS3000GB2, TSE2002GB2, and MCP9804
2012-03-12 10:33:00 -07:00
i2c
i2c-i801: SMBus patch for Intel Panther Point DeviceIDs
2011-05-24 20:58:49 +02:00
i2o
Fix common misspellings
2011-03-31 11:26:23 -03:00
ia64
Fix common misspellings
2011-03-31 11:26:23 -03:00
ide
…
infiniband
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
input
Input: elantech - describe further the protocol
2011-05-16 22:48:24 -07:00
ioctl
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
2011-05-25 16:55:55 -07:00
isdn
Fix common misspellings
2011-03-31 11:26:23 -03:00
ja_JP
HOWTO: sync up Documentaion/ja_JP/HOWTO
2011-04-19 16:53:45 -07:00
kbuild
Merge branch 'kconfig-for-40' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-05-25 16:54:01 -07:00
kdump
kdump: update kexec-tools URL and Vivek's email
2010-11-25 14:36:38 +01:00
ko_KR
Docs/Kconfig: Update: osdl.org -> linuxfoundation.org
2010-11-15 23:50:13 +01:00
laptops
thinkpad-acpi: handle HKEY 0x4010, 0x4011 events
2011-07-07 10:39:05 -04:00
leds
Documentation: consolidate leds files to leds/ subdir
2011-04-04 17:51:47 -07:00
m68k
…
make
kbuild: introduce HDR_ARCH_LIST for headers_install_all
2010-12-14 22:16:19 +01:00
mips
Fix common misspellings
2011-03-31 11:26:23 -03:00
misc-devices
Fix common misspellings
2011-03-31 11:26:23 -03:00
mmc
mmc: MMC boot partitions support.
2011-05-24 21:01:21 -04:00
mn10300
…
mtd
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
namespaces
…
netlabel
Documentation/: it's -> its where appropriate
2010-04-23 02:09:52 +02:00
networking
tcp: implement RFC 5961 3.2
2013-01-11 09:03:48 -08:00
nfc
NFC: Driver for NXP Semiconductors PN544 NFC chip.
2011-01-13 08:03:19 -08:00
parisc
…
PCI
Fix common misspellings
2011-03-31 11:26:23 -03:00
pcmcia
pcmcia: use autoconfiguration feature for ioports and iomem
2010-09-29 17:20:24 +02:00
power
PM / Runtime: Automatically retry failed autosuspends
2011-11-11 09:36:57 -08:00
powerpc
Fix common misspellings
2011-03-31 11:26:23 -03:00
pps
pps: add parallel port PPS signal generator
2011-01-13 08:03:21 -08:00
prctl
…
pti
Kernel documentation for the PTI feature.
2011-05-13 16:31:00 -07:00
ptp
ptp: Added a brand new class driver for ptp clocks.
2011-05-23 13:01:00 -07:00
rapidio
rapidio: add RapidIO documentation
2011-03-23 19:46:41 -07:00
RCU
rcu: Decrease memory-barrier usage based on semi-formal proof
2011-05-26 09:42:23 -07:00
s390
Documentation: fix minor typos/spelling
2011-04-04 17:51:47 -07:00
scheduler
Documentation: update cgroupfs mount point
2011-06-15 21:52:50 -07:00
scsi
[SCSI] megaraid_sas: Version and Changelog update
2011-05-24 12:36:06 -04:00
security
Create Documentation/security/,
2011-05-19 15:59:38 -07:00
serial
Fix common misspellings
2011-03-31 11:26:23 -03:00
sh
sh: clkfwk: Kill off unused clk_set_rate_ex().
2010-11-15 18:25:12 +09:00
sound
Merge branch 'topic/hda' into for-linus
2011-05-22 10:01:35 +02:00
sparc
…
spi
Fix common misspellings
2011-03-31 11:26:23 -03:00
sysctl
coredump: add support for exe_file in core name
2011-05-26 17:12:36 -07:00
target
[SCSI] tcm_mod_builder.py: Fix generated *_drop_nodeacl() handler
2011-03-23 11:36:45 -05:00
telephony
Fix common misspellings
2011-03-31 11:26:23 -03:00
thermal
thermal: Add event notification to thermal framework
2011-01-12 00:08:35 -05:00
timers
doc: timers-howto: fix a typo ("unsgined")
2011-05-17 10:52:02 +02:00
trace
mm: change isolate mode from #define to bitwise type
2012-08-01 12:27:16 -07:00
usb
USB: update documentation for usbmon
2012-01-12 11:35:06 -08:00
video4linux
[media] uvcvideo: Add driver documentation
2011-05-20 09:30:36 -03:00
virtual
lguest: allow booting guest with CONFIG_RELOCATABLE=y
2011-08-17 10:55:53 -07:00
vm
Documentation: update cgroupfs mount point
2011-06-15 21:52:50 -07:00
w1
Fix common misspellings
2011-03-31 11:26:23 -03:00
watchdog
Fix common misspellings
2011-03-31 11:26:23 -03:00
wimax
…
x86
x86, doc only: Correct real-mode kernel header offset for init_size
2011-07-12 20:39:11 -07:00
zh_CN
Translated Documentation/email-clients.txt
2011-05-06 17:59:20 -07:00
.gitignore
add random binaries to .gitignore
2010-04-08 11:34:34 +02:00
00-INDEX
Merge branch 'docs-security' into docs-move
2011-05-20 09:10:04 -07:00
applying-patches.txt
…
atomic_ops.txt
Documentation/atomic_ops.txt: avoid volatile in sample code
2011-05-26 17:12:34 -07:00
bad_memory.txt
…
basic_profiling.txt
…
binfmt_misc.txt
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
braille-console.txt
…
bt8xxgpio.txt
…
btmrvl.txt
…
BUG-HUNTING
…
bus-virt-phys-mapping.txt
documentation: fix almost duplicate filenames (IO/io-mapping.txt)
2010-07-20 17:49:30 +00:00
cachetlb.txt
mm: convert mm->cpu_vm_cpumask into cpumask_var_t
2011-05-25 08:39:21 -07:00
Changes
Documentation/Changes: remove some really obsolete text
2011-07-11 16:48:38 -07:00
circular-buffers.txt
Document Linux's circular buffering capabilities
2010-03-24 16:31:22 -07:00
coccinelle.txt
scripts/coccinelle: update for compatability with Coccinelle 0.2.4
2010-12-03 12:27:01 +01:00
CodingStyle
Documentation: update CodingStyle memory allocators
2011-07-06 13:17:51 -07:00
cpu-hotplug.txt
Fix common misspellings
2011-03-31 11:26:23 -03:00
cpu-load.txt
…
cputopology.txt
topology/sysfs: Provide book id and siblings attributes
2010-09-09 20:41:25 +02:00
dcdbas.txt
…
debugging-modules.txt
…
debugging-via-ohci1394.txt
…
dell_rbu.txt
Fix common misspellings
2011-03-31 11:26:23 -03:00
devices.txt
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
2010-10-28 09:35:11 -07:00
DMA-API-HOWTO.txt
Documentation: DMA-API-HOWTO.txt: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN
2010-08-14 11:56:46 -07:00
DMA-API.txt
dma-mapping: remove dma_is_consistent API
2010-08-11 08:59:21 -07:00
DMA-attributes.txt
…
DMA-ISA-LPC.txt
…
dmaengine.txt
dmaengine: Add API documentation for slave dma usage
2011-05-25 14:49:20 -07:00
dontdiff
Documentation: update dontdiff file
2011-05-23 15:14:11 -07:00
dynamic-debug-howto.txt
Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
2011-03-27 19:46:59 -07:00
edac.txt
Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6
2011-04-07 11:14:49 -07:00
eisa.txt
Fix common misspellings
2011-03-31 11:26:23 -03:00
email-clients.txt
Documentation/email-clients.txt: update Thunderbird docs with wordwrap plugin
2011-01-13 08:03:15 -08:00
feature-removal-schedule.txt
x86: Remove the ancient and deprecated disable_hlt() and enable_hlt() facility
2012-11-05 09:44:26 +01:00
flexible-arrays.txt
flex_array: flex_array_prealloc takes a number of elements, not an end
2011-04-28 16:12:47 -04:00
futex-requeue-pi.txt
…
gcov.txt
…
gpio.txt
Revert "gpiolib: annotate gpio-intialization with __must_check"
2011-01-13 17:26:46 -08:00
highuid.txt
…
HOWTO
docs: update HOWTO for 2.6.x -> 3.x versioning
2012-06-01 15:12:55 +08:00
hw_random.txt
…
hwspinlock.txt
hwspinlock/core: use a mutex to protect the radix tree
2011-11-11 09:36:31 -08:00
init.txt
init/main.c: improve usability in case of init binary failure
2010-03-06 11:26:29 -08:00
initrd.txt
…
intel_txt.txt
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
Intel-IOMMU.txt
…
io_ordering.txt
…
io-mapping.txt
…
iostats.txt
Documentation/iostats.txt: bit-size reference etc.
2011-03-23 20:44:18 +01:00
IPMI.txt
IPMI: Add the document description of ipmi_get_smi_info
2010-12-14 00:22:00 -05:00
IRQ-affinity.txt
bitmap, irq: add smp_affinity_list interface to /proc/irq
2011-05-25 08:39:45 -07:00
IRQ.txt
…
irqflags-tracing.txt
Fix common misspellings
2011-03-31 11:26:23 -03:00
isapnp.txt
…
java.txt
…
kernel-doc-nano-HOWTO.txt
docbook: warn on unused doc entries
2010-09-11 16:49:21 -07:00
kernel-docs.txt
Documentation: update kernel-docs.txt
2011-01-06 09:59:38 -08:00
kernel-parameters.txt
x86, random: Verify RDRAND functionality and allow it to be disabled
2012-10-21 09:17:12 -07:00
kmemcheck.txt
…
kmemleak.txt
Documentation: update kmemleak supported archs
2011-06-15 21:52:50 -07:00
kobject.txt
kobject: documentation: Update to refer to kset-example.c.
2010-03-19 07:12:20 -07:00
kprobes.txt
tree-wide: fix comment/printk typos
2010-11-01 15:38:34 -04:00
kref.txt
kref: Fix typo in kref documentation
2011-03-07 13:20:05 -08:00
ldm.txt
Documentation: update broken web addresses.
2010-08-04 15:21:40 +02:00
local_ops.txt
…
lockdep-design.txt
…
lockstat.txt
Documentation: Add statistics about nested locks
2011-05-28 17:03:29 +02:00
logo.gif
…
logo.txt
…
magic-number.txt
take coda-private headers out of include/linux
2011-01-12 20:02:48 -05:00
Makefile
[media] Remove the old V4L1 v4lgrab.c file
2010-12-29 08:17:12 -02:00
ManagementStyle
…
mca.txt
…
md.txt
md:Documentation/md.txt - fix typo
2011-06-09 11:43:04 +10:00
media-framework.txt
Fix common misspellings
2011-03-31 11:26:23 -03:00
memory-barriers.txt
smp: Document transitivity for memory barriers.
2011-03-04 08:05:49 -08:00
memory-hotplug.txt
memory hotplug: Allow memory blocks to span multiple memory sections
2011-02-03 16:08:57 -08:00
memory.txt
…
mono.txt
…
mutex-design.txt
mutex: Fix annotations to include it in kernel-locking docbook
2010-09-03 08:19:51 +02:00
nmi_watchdog.txt
…
nommu-mmap.txt
…
numastat.txt
…
oops-tracing.txt
panic: Add taint flag TAINT_FIRMWARE_WORKAROUND ('I')
2010-05-19 08:37:43 +01:00
padata.txt
Documentation/padata.txt: fix typos etc.
2010-08-11 08:59:18 -07:00
parport-lowlevel.txt
…
parport.txt
…
pi-futex.txt
…
pnp.txt
doc: capitalization and other minor fixes in pnp doc
2010-02-05 12:22:44 +01:00
preempt-locking.txt
…
printk-formats.txt
Documentation: update printk-formats.txt
2011-06-15 21:52:50 -07:00
prio_tree.txt
…
rbtree.txt
Documentation: remove anticipatory scheduler info
2010-11-11 12:09:59 +01:00
rfkill.txt
Document the rfkill sysfs ABI
2010-03-10 17:09:33 -05:00
robust-futex-ABI.txt
…
robust-futexes.txt
…
rt-mutex-design.txt
variable name fix to Documentation/rt-mutex-design.txt
2010-06-05 17:39:09 +02:00
rt-mutex.txt
…
rtc.txt
RTC: Fix up rtc.txt documentation to reflect changes to generic rtc layer
2011-03-09 11:25:10 -08:00
SAK.txt
…
SecurityBugs
Fix common misspellings
2011-03-31 11:26:23 -03:00
serial-console.txt
…
sgi-ioc4.txt
…
sgi-visws.txt
…
SM501.txt
…
sparse.txt
update email address
2010-07-19 10:56:54 +02:00
spinlocks.txt
Documentation/spinlocks.txt: Remove reference to sti()/cli()
2011-07-11 12:45:04 -07:00
stable_api_nonsense.txt
doc: stable_api_nonsense.txt: fix paragraph to make more sense.
2011-03-30 12:02:05 +02:00
stable_kernel_rules.txt
stable: update references to older 2.6 versions for 3.x
2012-08-09 08:27:36 -07:00
SubmitChecklist
Documentation: update SubmitChecklist for O=objdir and kconfig testing
2010-05-24 07:31:20 -07:00
SubmittingDrivers
Fix common misspellings
2011-03-31 11:26:23 -03:00
SubmittingPatches
Documentation: update GregKH links
2011-05-23 15:14:11 -07:00
svga.txt
…
sysfs-rules.txt
Fix typos in comments
2010-03-16 11:47:56 +01:00
sysrq.txt
documentation: update sysrq.txt magic sysrq keys
2010-10-26 17:32:41 -07:00
unaligned-memory-access.txt
…
unicode.txt
…
unshare.txt
…
VGA-softcursor.txt
…
vgaarbiter.txt
Documentation: fix vgaarbiter.txt typos etc.
2011-05-23 15:14:11 -07:00
video-output.txt
…
volatile-considered-harmful.txt
Documentation/volatile-considered-harmful.txt: correct cpu_relax() documentation
2010-03-24 16:31:20 -07:00
workqueue.txt
workqueue: Document debugging tricks
2011-03-31 13:40:42 +02:00
xz.txt
decompressors: add XZ decompressor module
2011-01-13 08:03:24 -08:00
zorro.txt
…