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Dave Johnson 1d464c26b5 [MIPS] Fix wrong checksum for split TCP packets on 64-bit MIPS 
I've traced down an off-by-one TCP checksum calculation error under
the following conditions:

1) The TCP code needs to split a full-sized packet due to a reduced
   MSS (typically due to the addition of TCP options mid-stream like
   SACK).
   _AND_
2) The checksum of the 2nd fragment is larger than the checksum of the
   original packet.  After subtraction this results in a checksum for
   the 1st fragment with bits 16..31 set to 1. (this is ok)
   _AND_
3) The checksum of the 1st fragment's TCP header plus the previously
   32bit checksum of the 1st fragment DOES NOT cause a 32bit overflow
   when added together.  This results in a checksum of the TCP header
   plus TCP data that still has the upper 16 bits as 1's.
   _THEN_
4) The TCP+data checksum is added to the checksum of the pseudo IP
   header with csum_tcpudp_nofold() incorrectly (the bug).
    
The problem is the checksum of the TCP+data is passed to
csum_tcpudp_nofold() as an 32bit unsigned value, however the assembly
code acts on it as if it is a 64bit unsigned value.

This causes an incorrect 32->64bit extension if the sum has bit 31
set.  The resulting checksum is off by one.
    
This problems is data and TCP header dependent due to #2 and #3
above so it doesn't occur on every TCP packet split.
    
Signed-off-by: Dave Johnson <djohnson+linux-mips@sw.starentnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-04-20 14:58:37 +01:00
..
arc
ddb5xxx [MIPS] Make I8259A_IRQ_BASE customizable 2007-02-06 16:53:09 +00:00
dec [TC] TURBOchannel support for the DECstation 2007-02-09 16:23:16 +00:00
emma2rh [MIPS] Define MIPS_CPU_IRQ_BASE in generic header 2007-02-06 16:53:08 +00:00
ip32
jmr3927 [MIPS] Convert to RTC-class ds1742 driver 2007-03-04 19:02:34 +00:00
lasat [MIPS] Fix and cleanup the mess that a dozen prom_printf variants are. 2007-03-04 19:02:37 +00:00
mach-atlas [MIPS] SNI: Fix mc146818_decode_year 2007-03-04 19:02:31 +00:00
mach-au1x00 ide: remove static prototypes from include/asm-mips/mach-au1x00/au1xxx_ide.h 2007-03-17 21:57:24 +01:00
mach-cobalt [MIPS] Define MIPS_CPU_IRQ_BASE in generic header 2007-02-06 16:53:08 +00:00
mach-db1x00
mach-dec
mach-emma2rh [MIPS] Define MIPS_CPU_IRQ_BASE in generic header 2007-02-06 16:53:08 +00:00
mach-ev64120
mach-excite
mach-generic [MIPS] DMA: Fix a bunch of warnings due to missing inline keywords. 2007-03-04 19:02:39 +00:00
mach-ip22
mach-ip27 [MIPS] IP27, IP35: Fix warnings. 2007-03-17 01:03:24 +00:00
mach-ip32 [MIPS] IP27, IP35: Fix warnings. 2007-03-17 01:03:24 +00:00
mach-ja
mach-jazz [MIPS] Unify dma-{coherent,noncoherent.ip27,ip32} 2007-02-13 22:40:50 +00:00
mach-jmr3927 [MIPS] Convert to RTC-class ds1742 driver 2007-03-04 19:02:34 +00:00
mach-lasat
mach-mips [MIPS] SNI: Fix mc146818_decode_year 2007-03-04 19:02:31 +00:00
mach-ocelot
mach-ocelot3
mach-pb1x00
mach-pnx8550
mach-qemu
mach-rm [MIPS] RM: It should be #ifdef CONFIG_FOO not #if CONFIG_FOO ... 2007-03-04 19:02:38 +00:00
mach-sibyte
mach-sim
mach-vr41xx [MIPS] Make I8259A_IRQ_BASE customizable 2007-02-06 16:53:09 +00:00
mach-wrppmc
mach-yosemite
mips-boards [MIPS] Fix and cleanup the mess that a dozen prom_printf variants are. 2007-03-04 19:02:37 +00:00
pci
sgi [MIPS] Define MIPS_CPU_IRQ_BASE in generic header 2007-02-06 16:53:08 +00:00
sibyte [MIPS] Add missing silicon revisions for BCM112x 2007-04-20 14:58:37 +01:00
sn
tx4927
tx4938
vr41xx [MIPS] Make I8259A_IRQ_BASE customizable 2007-02-06 16:53:09 +00:00
xtalk
8253pit.h
a.out.h
abi.h [MIPS] signals: Share even more code. 2007-02-18 21:31:35 +00:00
addrspace.h
asm.h
asmmacro-32.h
asmmacro-64.h
asmmacro.h
atomic.h [MIPS] Lockdep: Fix recursion bug. 2007-03-17 01:03:29 +00:00
auxvec.h
barrier.h
bcache.h
bitops.h [MIPS] Lockdep: Fix recursion bug. 2007-03-17 01:03:29 +00:00
bootinfo.h [MIPS] prom_free_prom_memory cleanup 2007-02-06 16:53:09 +00:00
branch.h
break.h
bug.h [MIPS] Fix BUG(), BUG_ON() handling 2007-04-20 14:58:37 +01:00
bugs.h
byteorder.h
cache.h
cachectl.h
cacheflush.h [MIPS] Implement flush_anon_page(). 2007-03-24 17:01:49 +00:00
cacheops.h
checksum.h [MIPS] Fix wrong checksum for split TCP packets on 64-bit MIPS 2007-04-20 14:58:37 +01:00
compat-signal.h [MIPS] signals: Share even more code. 2007-02-18 21:31:35 +00:00
compat.h
compiler.h
cpu-features.h [MIPS] FPU ownership management & preemption fixes 2007-03-17 01:03:26 +00:00
cpu-info.h [MIPS] FPU ownership management & preemption fixes 2007-03-17 01:03:26 +00:00
cpu.h
cputime.h
current.h
debug.h
delay.h [MIPS] Make MIPS udelay() preempt safe under DEBUG_PREEMPT 2007-03-24 17:01:49 +00:00
device.h
div64.h
dma-mapping.h [MIPS] Don't claim we support dma_declare_coherent_memory - we don't. 2007-02-13 22:40:50 +00:00
dma.h [MIPS] ISA: Fix typo 2007-03-08 01:10:30 +00:00
ds1216.h [MIPS] Support for several more SNI RM models. 2007-02-18 21:31:37 +00:00
ds1286.h
dsp.h
elf.h
emergency-restart.h
errno.h
fcntl.h
fixmap.h
floppy.h
fpregdef.h
fpu_emulator.h
fpu.h [MIPS] Retry {save,restore}_fp_context if failed in atomic context. 2007-04-20 14:58:37 +01:00
futex.h
gdb-stub.h
gfx.h
gt64120.h
gt64240.h
hardirq.h
hazards.h [MIPS] Fix pipeline hazard. 2007-03-24 17:01:49 +00:00
highmem.h
hw_irq.h
i8259.h [MIPS] Make I8259A_IRQ_BASE customizable 2007-02-06 16:53:09 +00:00
ide.h
inst.h
inventory.h
io.h [MIPS] Iomap implementation. 2007-02-18 21:31:34 +00:00
ioctl.h [MIPS] Remove unreferenced _IOC_SLMASK macro in ioctl.h. 2007-02-26 23:06:06 +00:00
ioctls.h
ipc.h
ipcbuf.h
irq_cpu.h [MIPS] Define MIPS_CPU_IRQ_BASE in generic header 2007-02-06 16:53:08 +00:00
irq_regs.h
irq.h [MIPS] Make I8259A_IRQ_BASE customizable 2007-02-06 16:53:09 +00:00
irqflags.h [MIPS] SMTC: Fix recursion in instant IPI replay code. 2007-03-29 23:46:36 +01:00
isadep.h
jazz.h
jazzdma.h
Kbuild
kexec.h
kmap_types.h
kspd.h
linkage.h
local.h
m48t35.h
m48t37.h
marvell.h [MIPS] MV64340: Add missing prototype for mv64340_irq_init(). 2007-03-29 23:46:35 +01:00
mc146818-time.h
mc146818rtc.h
mips_mt.h [MIPS] SMTC: <asm/mips_mt.h> must include <linux/cpumask.h> 2007-03-07 00:07:15 +00:00
mipsmtregs.h [MIPS] MT: Nuke duplicate mips_mt_regdump() prototype. 2007-02-06 16:53:24 +00:00
mipsprom.h
mipsregs.h
mman.h [PATCH] Remove final references to deprecated "MAP_ANON" page protection flag 2007-02-11 10:51:17 -08:00
mmu_context.h
mmu.h
mmzone.h
module.h
msc01_ic.h
msgbuf.h
mutex.h
namei.h
nile4.h
paccess.h
page.h [MIPS] FLATMEM: introduce PHYS_OFFSET. 2007-02-06 16:53:13 +00:00
param.h
parport.h
pci.h [MIPS] Iomap implementation. 2007-02-18 21:31:34 +00:00
percpu.h
pgalloc.h [MIPS] Add external declaration of pagetable_init() to pgalloc.h 2007-02-18 21:31:36 +00:00
pgtable-32.h
pgtable-64.h [MIPS] Always use virt_to_phys() when translating kernel addresses 2007-03-24 17:01:49 +00:00
pgtable-bits.h
pgtable.h [MIPS] Always use virt_to_phys() when translating kernel addresses 2007-03-24 17:01:49 +00:00
pmon.h
poll.h
posix_types.h
prctl.h
prefetch.h
processor.h
ptrace.h [MIPS] Add basic SMARTMIPS ASE support 2007-02-22 00:50:44 +00:00
qemu.h
r4kcache.h
reboot.h
reg.h
regdef.h
resource.h
rm9k-ocd.h
rtc.h
rtlx.h [MIPS] RTLX: Handle copy_*_user return values. 2007-03-17 01:03:29 +00:00
scatterlist.h
sections.h [MIPS] Remove _fdata from asm-mips/sections.h 2007-02-06 16:53:15 +00:00
segment.h
semaphore.h
sembuf.h
serial.h
setup.h
sgialib.h [MIPS] Fix and cleanup the mess that a dozen prom_printf variants are. 2007-03-04 19:02:37 +00:00
sgiarcs.h [MIPS] ARC: Fix warning. 2007-03-24 17:01:49 +00:00
sgidefs.h
shmbuf.h
shmparam.h
sigcontext.h [MIPS] Add basic SMARTMIPS ASE support 2007-02-22 00:50:44 +00:00
siginfo.h
signal.h [MIPS] signals: Share even more code. 2007-02-18 21:31:35 +00:00
sim.h
smp.h
smtc_ipi.h [MIPS] SMTC: Fix recursion in instant IPI replay code. 2007-03-29 23:46:36 +01:00
smtc_proc.h
smtc.h [MIPS] SMTC: Add fordward declarations for mm_struct and task_struct. 2007-03-07 00:07:16 +00:00
sni.h [MIPS] SNI: MIPS_CPU_IRQ_BASE cleanup 2007-02-26 23:06:06 +00:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h
spinlock.h [MIPS] Fix __raw_read_trylock() to allow multiple readers 2007-03-07 00:07:17 +00:00
stackframe.h [MIPS] Add basic SMARTMIPS ASE support 2007-02-22 00:50:44 +00:00
stacktrace.h
stat.h
statfs.h
string.h
suspend.h
sysmips.h
system.h [MIPS] Lockdep: Fix recursion bug. 2007-03-17 01:03:29 +00:00
termbits.h
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
thread_info.h [MIPS] Disallow CpU exception in kernel again. 2007-04-20 14:58:37 +01:00
time.h
timex.h
titan_dep.h
tlb.h
tlbdebug.h
tlbflush.h
topology.h
traps.h
tx3912.h
types.h
uaccess.h [MIPS] Export __copy_user_inatomic. 2007-03-07 00:07:17 +00:00
ucontext.h
unaligned.h
unistd.h [MIPS] Wire up ioprio_set and ioprio_get. 2007-03-07 00:07:18 +00:00
user.h
vga.h
vpe.h
war.h
watch.h
wbflush.h
xor.h
xxs1500.h