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Gerrit Renker 6fdd34d43b dccp ccid-2: Phase out the use of boolean Ack Vector sysctl 
This removes the use of the sysctl and the minisock variable for the Send Ack
Vector feature, as it now is handled fully dynamically via feature negotiation
(i.e. when CCID-2 is enabled, Ack Vectors are automatically enabled as per
 RFC 4341, 4.).

Using a sysctl in parallel to this implementation would open the door to
crashes, since much of the code relies on tests of the boolean minisock /
sysctl variable. Thus, this patch replaces all tests of type

	if (dccp_msk(sk)->dccpms_send_ack_vector)
		/* ... */
with
	if (dp->dccps_hc_rx_ackvec != NULL)
		/* ... */

The dccps_hc_rx_ackvec is allocated by the dccp_hdlr_ackvec() when feature
negotiation concluded that Ack Vectors are to be used on the half-connection.
Otherwise, it is NULL (due to dccp_init_sock/dccp_create_openreq_child),
so that the test is a valid one.

The activation handler for Ack Vectors is called as soon as the feature
negotiation has concluded at the
 * server when the Ack marking the transition RESPOND => OPEN arrives;
 * client after it has sent its ACK, marking the transition REQUEST => PARTOPEN.

Adding the sequence number of the Response packet to the Ack Vector has been
removed, since
 (a) connection establishment implies that the Response has been received;
 (b) the CCIDs only look at packets received in the (PART)OPEN state, i.e.
     this entry will always be ignored;
 (c) it can not be used for anything useful - to detect loss for instance, only
     packets received after the loss can serve as pseudo-dupacks.

There was a FIXME to change the error code when dccp_ackvec_add() fails.
I removed this after finding out that:
 * the check whether ackno < ISN is already made earlier,
 * this Response is likely the 1st packet with an Ackno that the client gets,
 * so when dccp_ackvec_add() fails, the reason is likely not a packet error.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-08 01:19:06 -08:00
..
ABI Add c2 port support 2008-11-12 17:17:18 -08:00
accounting .gitignore updates 2008-10-30 11:38:45 -07:00
acpi ACPI: update debug parameter documentation 2008-11-07 21:45:29 -05:00
aoe
arm [ARM] 5323/1: Remove outdated empeg documentation. 2008-10-29 22:00:39 +00:00
auxdisplay .gitignore updates 2008-10-30 11:38:45 -07:00
blackfin Blackfin arch: add supporting for kgdb 2008-10-13 14:07:19 +08:00
block Merge branch 'docs' of git://git.lwn.net/linux-2.6 2008-10-16 12:18:16 -07:00
blockdev Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
cdrom doc/cdrom: Trvial documentation error, file not present 2008-10-10 08:22:44 +02:00
cgroups freezer_cg: disable writing freezer.state of root cgroup 2008-11-12 17:17:16 -08:00
connector .gitignore updates 2008-10-30 11:38:45 -07:00
console
controllers memcg: avoid accounting special pages 2008-10-20 08:52:38 -07:00
cpu-freq [CPUFREQ] Documentation: Add Blackfin to list of supported processors 2008-11-25 13:38:29 -05:00
cpuidle
cris fix random typos 2008-10-16 11:21:30 -07:00
crypto
development-process Add the development process document 2008-10-16 11:51:30 -06:00
device-mapper
DocBook WAN: syncppp.c is no longer used by any kernel code. Remove it. 2008-11-22 02:49:48 +01:00
driver-model
dvb
early-userspace
fault-injection
fb uvesafb: document mode to mode_option parameter change 2008-10-16 11:21:44 -07:00
filesystems epoll: introduce resource usage limits 2008-12-01 19:55:24 -08:00
firmware_class
frv
hwmon adt7462: new hwmon driver 2008-11-12 17:17:17 -08:00
i2c i2c: The i2c mailing list is moving 2008-10-30 15:55:47 +01:00
i2o
ia64 .gitignore updates 2008-10-30 11:38:45 -07:00
ide
infiniband
input Input: fix the example of an input device driver 2008-11-11 11:41:49 -05:00
ioctl Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
isdn Rationalise Randy's address a bit 2008-10-30 11:38:47 -07:00
ja_JP HOWTO: Sync patch for jp_JP/HOWTO 2008-10-29 15:03:50 -07:00
kbuild kconfig-language.txt: remove bogus hint 2008-05-04 21:05:56 +02:00
kdump powerpc: Support for relocatable kdump kernel 2008-10-22 15:01:22 +11:00
ko_KR
laptops Merge branch 'linus' into test 2008-10-23 00:11:07 -04:00
lguest lguest: fix example launcher compile after moved asm-x86 dir. 2008-10-31 11:24:27 +11:00
m68k
make
mips
mn10300
mtd [MTD] [NAND] nand_ecc.c: rewrite for improved performance 2008-08-16 10:55:33 +01:00
namespaces
netlabel
networking dccp ccid-2: Phase out the use of boolean Ack Vector sysctl 2008-12-08 01:19:06 -08:00
parisc
PCI Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
pcmcia .gitignore updates 2008-10-30 11:38:45 -07:00
power pm: document use of RTC in pm_trace 2008-10-16 11:21:29 -07:00
powerpc powerpc: Repair device bindings documentation 2008-11-10 15:17:52 -06:00
prctl
RCU rcu: documents rculist_nulls 2008-11-16 19:41:14 -08:00
s390 [S390] cio: Exorcise cio_msg= from documentation. 2008-10-10 21:33:49 +02:00
scheduler sched: remove sched-design.txt from 00-INDEX 2008-10-30 11:37:58 +01:00
scsi Rationalise Randy's address a bit 2008-10-30 11:38:47 -07:00
serial Create/use more directory structure in the Documentation/ tree. 2008-11-14 17:28:53 +00:00
sh sh: Kill off long-dead HD64465 cchip support. 2008-10-28 20:07:44 +09:00
sound Merge branch 'topic/fix/hda' into for-linus 2008-11-25 17:21:32 +01:00
sparc sparc: Remove Documentation/sparc/sbus_drivers.txt 2008-08-29 02:15:25 -07:00
spi spi documentation: use __initdata on struct 2008-12-01 19:55:24 -08:00
sysctl Document kernel taint flags properly 2008-10-29 15:03:49 -07:00
telephony remove mention of CONFIG_KMOD from documentation 2008-07-22 19:24:29 +10:00
thermal
timers hpet: /dev/hpet - fixes and cleanup 2008-07-31 18:45:41 +02:00
tracers tracing, doc: update mmiotrace documentation 2008-11-23 20:33:24 +01:00
uml
usb Merge branch 'master' into for-upstream 2008-10-20 16:07:19 +01:00
video4linux V4L/DVB (9482): Documentation, especially regarding audio and informational links 2008-11-11 08:11:24 -02:00
vm .gitignore updates 2008-10-30 11:38:45 -07:00
w1 hdq: documentation for OMAP HDQ 2008-11-12 17:17:18 -08:00
watchdog .gitignore updates 2008-10-30 11:38:45 -07:00
x86 doc/x86: fix doc subdirs 2008-10-28 16:36:42 +01:00
zh_CN
00-INDEX Merge branch 'doc-subdirs' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs 2008-11-15 11:51:03 -08:00
applying-patches.txt
atomic_ops.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt gpio: add bt8xxgpio driver 2008-07-25 10:53:30 -07:00
BUG-HUNTING
c2port.txt Add c2 port support 2008-11-12 17:17:18 -08:00
cachetlb.txt
Changes
CodingStyle documentation: update CodingStyle tips for Emacs users 2008-07-25 10:53:29 -07:00
cpu-hotplug.txt cpu hotplug: s390 doesn't support additional_cpus anymore. 2008-08-12 16:07:28 -07:00
cpu-load.txt
cpusets.txt container freezer: document the cgroup freezer subsystem. 2008-10-20 08:52:34 -07:00
cputopology.txt cpu topology: always define CPU topology information 2008-06-13 10:09:46 +02:00
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt USB: add USB test and measurement class driver 2008-10-17 14:40:51 -07:00
DMA-API.txt DMA-API.txt: fix description of pci_map_sg/dma_map_sg scatterlists handling 2008-12-01 19:55:24 -08:00
DMA-attributes.txt powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code 2008-07-22 10:39:36 +10:00
DMA-ISA-LPC.txt
DMA-mapping.txt Documentation/DMA-mapping.txt: update for pci_dma_mapping_error() changes 2008-09-23 08:09:14 -07:00
dontdiff dontdiff: more updates to be closer to gitignore 2008-10-16 11:21:31 -07:00
edac.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
eisa.txt
email-clients.txt Documentation/email-clients.txt: add some info about gmail 2008-11-06 15:41:19 -08:00
exception.txt
feature-removal-schedule.txt Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
ftrace.txt ftrace: ftrace.txt version update 2008-11-04 10:12:24 +01:00
gpio.txt gpiolib: request/free hooks 2008-10-16 11:21:40 -07:00
highuid.txt
HOWTO Remove Andrew Morton's http://www.zip.com.au/~akpm/ 2008-10-16 11:21:32 -07:00
hw_random.txt
ics932s401 ics932s401: new clock generator chip driver 2008-11-12 17:17:18 -08:00
initrd.txt
Intel-IOMMU.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
io_ordering.txt
io-mapping.txt io mapping: improve documentation 2008-11-03 18:21:44 +01:00
IO-mapping.txt
iostats.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
IPMI.txt
IRQ-affinity.txt genirq: Expose default irq affinity mask (take 3) 2008-06-05 15:18:30 +02:00
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt sched: add kernel doc for the completion, fix kernel-doc-nano-HOWTO.txt 2008-08-26 10:26:54 +02:00
kernel-docs.txt doc: update to URL and status of kernel-docs.txt entry 2008-06-06 11:29:10 -07:00
kernel-parameters.txt Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-11-19 18:51:56 -08:00
keys-request-key.txt
keys.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
kobject.txt kobject: Fix kobject_rename and !CONFIG_SYSFS 2008-10-16 09:24:52 -07:00
kprobes.txt powerpc/booke: Add kprobes support for booke style processors 2008-06-26 03:35:46 -05:00
kref.txt
ldm.txt
leds-class.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
local_ops.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
lockdep-design.txt
lockstat.txt
logo.gif
logo.txt
magic-number.txt
Makefile docsrc: build Documentation/ sources 2008-08-12 16:07:30 -07:00
ManagementStyle docs: fix ManagementStyle book name 2008-10-30 11:38:46 -07:00
markers.txt markers: documentation fix for teardown 2008-10-14 10:38:33 +02:00
mca.txt
md.txt md: Tidy up rdev_size_store a bit: 2008-07-21 14:22:18 +10:00
memory-barriers.txt read_barrier_depends arch fixlets 2008-05-14 10:05:18 -07:00
memory-hotplug.txt
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt x86: nmi_watchdog - documentation fix - v2 2008-07-08 13:16:10 +02:00
nommu-mmap.txt
numastat.txt
oops-tracing.txt
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt DOC: add printk-formats.txt 2008-11-12 17:17:17 -08:00
prio_tree.txt
rbtree.txt
rfkill.txt rfkill: add master_switch_mode and EPO lock to rfkill and rfkill-input 2008-10-31 19:00:09 -04:00
robust-futex-ABI.txt
robust-futexes.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
SAK.txt Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
SecurityBugs
SELinux.txt selinux: add support for installing a dummy policy (v2) 2008-08-27 08:54:08 +10:00
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
Smack.txt
sparse.txt kbuild: sparse needs CF not CHECKFLAGS 2008-07-25 22:12:39 +02:00
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt Update stable tree documentation 2008-10-29 15:03:49 -07:00
SubmitChecklist documentation: explain memory barriers 2008-10-16 11:21:32 -07:00
SubmittingDrivers Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
SubmittingPatches Merge branch 'docs' of git://git.lwn.net/linux-2.6 2008-10-16 12:18:16 -07:00
svga.txt
sysfs-rules.txt sysfs-rules.txt: reword API stability statement 2008-07-21 21:54:59 -07:00
sysrq.txt Merge branch 'v28-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-20 13:19:56 -07:00
tracepoints.txt tracing: tracepoints, documentation 2008-10-14 10:28:47 +02:00
unaligned-memory-access.txt introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol 2008-07-25 10:53:27 -07:00
unicode.txt
unshare.txt
VGA-softcursor.txt
video-output.txt
volatile-considered-harmful.txt Documentation cleanup: trivial misspelling, punctuation, and grammar corrections. 2008-07-26 12:00:06 -07:00
voyager.txt
zorro.txt