linux-toradex.git/include/linux/random.h, branch Colibri_T30_LinuxImageV2.1Beta2_20140206

net: Compute protocol sequence numbers and fragment IDs using MD5.

2011-08-07T01:33:19+00:00

Computers have become a lot faster since we compromised on the
partial MD4 hash which we use currently for performance reasons.

MD5 is a much safer choice, and is inline with both RFC1948 and
other ISS generators (OpenBSD, Solaris, etc.)

Furthermore, only having 24-bits of the sequence number be truly
unpredictable is a very serious limitation.  So the periodic
regeneration and 8-bit counter have been removed.  We compute and
use a full 32-bit sequence number.

For ipv6, DCCP was found to use a 32-bit truncated initial sequence
number (it needs 43-bits) and that is fixed here as well.

Reported-by: Dan Kaminsky 
Tested-by: Willy Tarreau 
Signed-off-by: David S. Miller

ipv6: make fragment identifications less predictable

2011-07-22T04:25:58+00:00

IPv6 fragment identification generation is way beyond what we use for
IPv4 : It uses a single generator. Its not scalable and allows DOS
attacks.

Now inetpeer is IPv6 aware, we can use it to provide a more secure and
scalable frag ident generator (per destination, instead of system wide)

This patch :
1) defines a new secure_ipv6_id() helper
2) extends inet_getid() to provide 32bit results
3) extends ipv6_select_ident() with a new dest parameter

Reported-by: Fernando Gont 
Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

lib/random32: export pseudo-random number generator for modules

2010-05-27T16:12:52+00:00

This patch moves the definition of struct rnd_state and the inline
__seed() function to linux/random.h.  It renames the static __random32()
function to prandom32() and exports it for use in modules.

prandom32() is useful as a privately-seeded pseudo random number generator
that can give the same result every time it is initialized.

For FCoE FC-BB-6 VN2VN mode self-selected unique FC address generation, we
need an pseudo-random number generator seeded with the 64-bit world-wide
port name.  A truly random generator or one seeded with randomness won't
do because the same sequence of numbers should be generated each time we
boot or the link comes up.

A prandom32_seed() inline function is added to the header file.  It is
inlined not for speed, but so the function won't be expanded in the base
kernel, but only in the module that uses it.

Signed-off-by: Joe Eykholt 
Acked-by: Matt Mackall 
Cc: Theodore Ts'o 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

headers_check fix: linux/random.h

2009-01-30T18:35:59+00:00

fix the following 'make headers_check' warning:

  usr/include/linux/random.h:39: found __[us]{8,16,32,64} type without #include 

Signed-off-by: Jaswinder Singh Rajput

sparseirq: move set/get_timer_rand_state back to .c

2009-01-03T20:01:23+00:00

those two functions only used in that C file

Signed-off-by: Yinghai Lu 
Signed-off-by: Linus Torvalds

sparse irqs: handle !GENIRQ platforms

2008-12-12T11:28:50+00:00

Impact: build fix

fix:

 In file included from /home/mingo/tip/arch/m68k/amiga/amiints.c:39:
 /home/mingo/tip/include/linux/interrupt.h:21: error: expected identifier or '('
 /home/mingo/tip/arch/m68k/amiga/amiints.c: In function 'amiga_init_IRQ':

Signed-off-by: Ingo Molnar

sparse irq_desc[] array: core kernel and x86 changes

2008-12-08T13:31:51+00:00

Impact: new feature

Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with
NR_CPUS set to large values. The goal is to be able to scale up to much
larger NR_IRQS value without impacting the (important) common case.

To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of
irq_desc pointers.

When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc,
this also makes the IRQ descriptors NUMA-local (to the site that calls
request_irq()).

This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now
uses desc->chip_data for x86 to store irq_cfg.

Signed-off-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

[PATCH] mark struct file_operations const 1

2007-02-12T17:48:44+00:00

Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[RANDOM]: Annotate random.h IP helpers.

2006-12-03T05:22:51+00:00

Signed-off-by: Al Viro 
Signed-off-by: David S. Miller

[PATCH] rename net_random to random32

2006-10-17T15:18:43+00:00

Make net_random() more widely available by calling it random32

akpm: hopefully this will permit the removal of carta_random32.  That needs
confirmation from Stephane - this code looks somewhat more computationally
expensive, and has a different (ie: callee-stateful) interface.

[akpm@osdl.org: lots of build fixes, cleanups]
Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller 
Cc: Stephane Eranian 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds