OpenCloudOS-Kernel/include
Gerrit Renker b4d4f7c70f [DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
	* timestamps are recorded on the listening socket;
	* Responses are sent from dccp_request_sockets;
	* suppose two connections reach the listening socket with very small time in between:
	* the first timestamp value gets overwritten by the second connection request.

This is not really good, so this patch separates timestamps into
 * those which are received by the server during the initial handshake (on dccp_request_sock);
 * those which are received by the client or the client after connection establishment.

As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).

The timestamp-echoing now works as follows:
 * when a timestamp is present on the initial Request, it is placed into dreq, due to the
   call to dccp_parse_options in dccp_v{4,6}_conn_request;
 * when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
   from the request_sock into the child cocket in dccp_create_openreq_child;
 * timestamps received on an (established) dccp_sock are treated as before.

Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.

Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:57:51 -08:00
..
acpi kobject: convert /sys/firmware/acpi/ to use kobject_create 2008-01-24 20:40:23 -08:00
asm-alpha alpha: build fixes 2007-12-17 19:28:16 -08:00
asm-arm Merge branch 'pxa-plat' into devel 2008-01-28 13:21:38 +00:00
asm-avr32 [ARM] 4764/1: [AT91] AT91CAP9 core support 2008-01-26 15:01:13 +00:00
asm-blackfin [Blackfin] arch: Add the semtimedop syscall. Upstream uClibc doesn't compile without it. 2008-01-27 19:56:43 +08:00
asm-cris ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
asm-frv ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
asm-generic sched: SCHED_FIFO/SCHED_RR watchdog timer 2008-01-25 21:08:27 +01:00
asm-h8300 asm-h8300: parentheses around definition CLOCK_TICK_RATE 2007-12-10 19:43:54 -08:00
asm-ia64 [IA64] Update Altix BTE error return status patch 2008-01-03 13:18:58 -08:00
asm-m32r m32r: Update sys_rt_sigsuspend 2007-11-28 01:24:04 +09:00
asm-m68k Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
asm-m68knommu m68knommu: fix pread/pwrite defines 2007-11-05 15:12:33 -08:00
asm-mips [MIPS] SMTC: Fix build error. 2008-01-22 00:35:23 +00:00
asm-parisc [PARISC] print more than one character at a time for pdc console 2007-12-06 09:32:15 -08:00
asm-powerpc ide: remove stale ide.h "configuration options" 2008-01-25 22:17:08 +01:00
asm-ppc ppc: fix AT_VECTOR_SIZE on arch/ppc 2007-10-22 19:18:54 -07:00
asm-s390 [S390] do local_irq_restore while spinning in spin_lock_irqsave. 2008-01-26 14:11:31 +01:00
asm-sh sh: add spi header and r2d platform data V3 2008-01-28 16:24:46 +09:00
asm-sparc [SPARC32]: Silence sparc32 warnings on missing syscalls. 2007-12-14 10:59:50 -08:00
asm-sparc64 [SPARC64]: Implement pci_resource_to_user() 2007-12-26 19:33:46 -08:00
asm-um uml: update address space affected by pud_clear 2007-11-14 18:45:37 -08:00
asm-v850 Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
asm-x86 sched: high-res preemption tick 2008-01-25 21:08:29 +01:00
asm-xtensa xtensa: dma-mapping.h is using linux/scatterlist.h functions, so include it 2007-10-24 13:28:40 +02:00
crypto [CRYPTO] api: Include sched.h for cond_resched in scatterwalk.h 2008-01-11 08:16:59 +11:00
keys
linux [DCCP]: Handle timestamps on Request/Response exchange separately 2008-01-28 14:57:51 -08:00
math-emu
media i2c: Constify client address data 2008-01-27 18:14:46 +01:00
mtd
net [NET]: Remove FASTCALL macro 2008-01-28 14:57:23 -08:00
pcmcia [AVR32] pcmcia ioaddr_t should be 32 bits on AVR32 2007-11-15 13:47:19 +01:00
rdma RDMA/cma: add support for rdma_migrate_id() 2008-01-25 14:15:32 -08:00
rxrpc
scsi SG: Convert SCSI to use scatterlist helpers for sg chaining 2008-01-28 10:05:27 +01:00
sound [ALSA] version 1.0.15 2007-11-20 20:16:43 +01:00
video Make asm-x86/bootparam.h includable from userspace. 2007-10-23 15:49:47 +10:00
xen
Kbuild