Commits · 622c81d57b392cc9be836670eb464a4dfaa9adfe · Kirill Smelkov / linux

24 Mar, 2015 26 commits

ipv6: generation of stable privacy addresses for link-local and autoconf · 622c81d5

Hannes Frederic Sowa authored Mar 23, 2015

This patch implements the stable privacy address generation for
link-local and autoconf addresses as specified in RFC7217.

  RID = F(Prefix, Net_Iface, Network_ID, DAD_Counter, secret_key)

is the RID (random identifier). As the hash function F we chose one
round of sha1. Prefix will be either the link-local prefix or the
router advertised one. As Net_Iface we use the MAC address of the
device. DAD_Counter and secret_key are implemented as specified.

We don't use Network_ID, as it couples the code too closely to other
subsystems. It is specified as optional in the RFC.

As Net_Iface we only use the MAC address: we simply have no stable
identifier in the kernel we could possibly use: because this code might
run very early, we cannot depend on names, as they might be changed by
user space early on during the boot process.

A new address generation mode is introduced,
IN6_ADDR_GEN_MODE_STABLE_PRIVACY. With iproute2 one can switch back to
none or eui64 address configuration mode although the stable_secret is
already set.

We refuse writes to ipv6/conf/all/stable_secret but only allow
ipv6/conf/default/stable_secret and the interface specific file to be
written to. The default stable_secret is used as the parameter for the
namespace, the interface specific can overwrite the secret, e.g. when
switching a network configuration from one system to another while
inheriting the secret.

Cc: Erik Kline <ek@google.com>
Cc: Fernando Gont <fgont@si6networks.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: YOSHIFUJI Hideaki/吉藤英明 <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

622c81d5

ipv6: introduce secret_stable to ipv6_devconf · 3d1bec99

Hannes Frederic Sowa authored Mar 23, 2015

This patch implements the procfs logic for the stable_address knob:
The secret is formatted as an ipv6 address and will be stored per
interface and per namespace. We track initialized flag and return EIO
errors until the secret is set.

We don't inherit the secret to newly created namespaces.

Cc: Erik Kline <ek@google.com>
Cc: Fernando Gont <fgont@si6networks.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: YOSHIFUJI Hideaki/吉藤英明 <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3d1bec99

lib: EXPORT_SYMBOL sha_init · ab2bb324

Hannes Frederic Sowa authored Mar 23, 2015

We need this symbol later on in ipv6.ko, thus export it via EXPORT_SYMBOL
like sha_transform already is.
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

ab2bb324

Merge branch 'bcmgenet-next' · 7f163d07

David S. Miller authored Mar 23, 2015

Florian Fainelli says:

====================
net: bcmgenet: integrated GPHY power up/down

This patch series implements integrated Gigabit PHY power up/down, which allows
us to save close to 300mW on some designs when the Gigabit PHY is known to be
unused (e.g: during bcmgenet_close or bcmgenet_suspend not doing Wake-on-LAN).

Changes in v2:

- drop an extra bcmgenet_ext_readl in bcmgenet_phy_power_set
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

7f163d07

net: bcmgenet: power down and up GPHY during suspend/resume · a6f31f5e

Florian Fainelli authored Mar 23, 2015

In case the interface is not used, power down the integrated GPHY during
suspend. Similarly to bcmgenet_open(), bcmgenet_resume() powers on the GPHY
prior to any UniMAC activity.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

a6f31f5e

net: bcmgenet: power up and down integrated GPHY when unused · a642c4f7

Florian Fainelli authored Mar 23, 2015

Power up the GPHY while we are bringing-up the network interface, and
conversely, upon bring down, power the GPHY down. In order to avoid
creating hardware hazards, make sure that the GPHY gets powered on
during bcmgenet_open() prior to the UniMAC being reset as the UniMAC may
start creating activity towards the GPHY if we reverse the steps.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

a642c4f7

net: bcmgenet: implement GPHY power down sequence · a9d608c1

Florian Fainelli authored Mar 23, 2015

Implement the GPHY power down sequence by setting all power down bits, putting
the GPHY in reset, and finally cutting the 25Mhz reference clock.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

a9d608c1

net: bcmgenet: fix GPHY power-up sequence · 0c81a8ee

Florian Fainelli authored Mar 23, 2015

We were missing a number of extra steps and delays to power-up the GPHY, update
the sequence to reflect the proper procedure here.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

0c81a8ee

net: bcmgenet: rename bcmgenet_ephy_power_up · 8212c983

Florian Fainelli authored Mar 23, 2015

In preparation for implementing the power down GPHY sequence, rename
bcmgenet_ephy_power_up to illustrate that it is not EPHY specific but
PHY agnostic, and add an "enable" argument.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

8212c983

net: bcmgenet: update bcmgenet_ephy_power_up to clear CK25_DIS bit · 0d017e21

Florian Fainelli authored Mar 23, 2015

The CK25_DIS bit controls whether a 25Mhz clock is fed to the GPHY or
not, in preparation for powering down the integrated GPHY when relevant,
make sure we clear that bit.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

0d017e21

net: bcmgenet: propagate errors from bcmgenet_power_down · ca8cf341

Florian Fainelli authored Mar 23, 2015

If bcmgenet_power_down() fails, we would want to propagate a return
value from bcmgenet_wol_power_down_cfg() to know about this.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

ca8cf341

Merge branch 'rhashtable-next' · cc330b55

David S. Miller authored Mar 23, 2015

Herbert Xu says:

====================
rhashtable: Multiple rehashing

This series introduces multiple rehashing.

Recall that the original implementation in br_multicast used
two list pointers per hash node and therefore is limited to at
most one rehash at a time since you need one list pointer for
the old table and one for the new table.

Thanks to Josh Triplett's suggestion of using a single list pointer
we're no longer limited by that.  So it is perfectly OK to have
an arbitrary number of tables in existence at any one time.

The reader and removal simply has to walk from the oldest table
to the newest table in order not to miss anything.  Insertion
without lookup are just as easy as we simply go to the last table
that we can find and add the entry there.

However, insertion with uniqueness lookup is more complicated
because we need to ensure that two simultaneous insertions of the
same key do not both succeed.  To achieve this, all insertions
including those without lookups are required to obtain the bucket
lock from the oldest hash table that is still alive.  This is
determined by having the rehasher (there is only one rehashing
thread in the system) keep a pointer of where it is up to.  If
a bucket has already been rehashed then it is dead, i.e., there
cannot be any more insertions to it, otherwise it is considered
alive.  This guarantees that the same key cannot be inserted
in two different tables in parallel.

Patch 1 is actually a bug fix for the walker.

Patch 2-5 eliminates unnecessary out-of-line copies of jhash.

Patch 6 makes rhashtable_shrink shrink to fit.

Patch 7 introduces multiple rehashing.  This means that if we
decide to grow then we will grow regardless of whether the previous
one has finished.  However, this is still asynchronous meaning
that if insertions come fast enough we may still end up with a
table that is overutilised.

Patch 8 adds support for GFP_ATOMIC allocations of struct bucket_table.

Finally patch 9 enables immediate rehashing.  This is done either
when the table reaches 100% utilisation, or when the chain length
exceeds 16 (the latter can be disabled on request, e.g., for
nft_hash.

With these patches the system should no longer have any trouble
dealing with fast insertions on a small table.  In the worst
case you end up with a list of tables that's log N in length
while the rehasher catches up.

v3 restores rhashtable_shrink and fixes a number of bugs in the
multiple rehashing patches (7 and 9).
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

cc330b55