Commit Graph

31040 Commits

Author SHA1 Message Date
Hannes Frederic Sowa 0954cf9c61 ipv6: introduce ip6_dst_mtu_forward and protect forwarding path with it
In the IPv6 forwarding path we are only concerend about the outgoing
interface MTU, but also respect locked MTUs on routes. Tunnel provider
or IPSEC already have to recheck and if needed send PtB notifications
to the sending host in case the data does not fit into the packet with
added headers (we only know the final header sizes there, while also
using path MTU information).

The reason for this change is, that path MTU information can be injected
into the kernel via e.g. icmp_err protocol handler without verification
of local sockets. As such, this could cause the IPv6 forwarding path to
wrongfully emit Packet-too-Big errors and drop IPv6 packets.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: John Heffner <johnwheffner@gmail.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-13 11:22:54 -08:00
Hannes Frederic Sowa f87c10a8aa ipv4: introduce ip_dst_mtu_maybe_forward and protect forwarding path against pmtu spoofing
While forwarding we should not use the protocol path mtu to calculate
the mtu for a forwarded packet but instead use the interface mtu.

We mark forwarded skbs in ip_forward with IPSKB_FORWARDED, which was
introduced for multicast forwarding. But as it does not conflict with
our usage in unicast code path it is perfect for reuse.

I moved the functions ip_sk_accept_pmtu, ip_sk_use_pmtu and ip_skb_dst_mtu
along with the new ip_dst_mtu_maybe_forward to net/ip.h to fix circular
dependencies because of IPSKB_FORWARDED.

Because someone might have written a software which does probe
destinations manually and expects the kernel to honour those path mtus
I introduced a new per-namespace "ip_forward_use_pmtu" knob so someone
can disable this new behaviour. We also still use mtus which are locked on a
route for forwarding.

The reason for this change is, that path mtus information can be injected
into the kernel via e.g. icmp_err protocol handler without verification
of local sockets. As such, this could cause the IPv4 forwarding path to
wrongfully emit fragmentation needed notifications or start to fragment
packets along a path.

Tunnel and ipsec output paths clear IPCB again, thus IPSKB_FORWARDED
won't be set and further fragmentation logic will use the path mtu to
determine the fragmentation size. They also recheck packet size with
help of path mtu discovery and report appropriate errors.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: John Heffner <johnwheffner@gmail.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-13 11:22:54 -08:00
Terry Lam 6c76a07a71 HHF qdisc: fix jiffies-time conversion.
This is to be compatible with the use of "get_time" (i.e. default
time unit in us) in iproute2 patch for HHF as requested by Stephen.

Signed-off-by: Terry Lam <vtlam@google.com>
Acked-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-13 11:20:39 -08:00
David S. Miller 45593c2bd2 Included changes:
- substitute FSF address with URL
 - deselect current bat-GW when GW-client mode gets deactivated
 - send every DHCP packet using bat-unicast messages when GW-client mode is
   enabled
 - implement the Extended Isolation mechanism (it is an enhancement of the
   already existing batman-AP-isolation). This mechanism allows the user to drop
   packets exchanged by selected clients by using netfilter marks.
 - fix typ0 in header guard
 - minor code cleanups
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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Included changes:
- substitute FSF address with URL
- deselect current bat-GW when GW-client mode gets deactivated
- send every DHCP packet using bat-unicast messages when GW-client mode is
  enabled
- implement the Extended Isolation mechanism (it is an enhancement of the
  already existing batman-AP-isolation). This mechanism allows the user to drop
  packets exchanged by selected clients by using netfilter marks.
- fix typ0 in header guard
- minor code cleanups

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:59:34 -05:00
Christoph Paasch 3e7013ddf5 tcp: metrics: Allow selective get/del of tcp-metrics based on src IP
We want to be able to get/del tcp-metrics based on the src IP. This
patch adds the necessary parsing of the netlink attribute and if the
source address is set, it will match on this one too.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:38:18 -05:00
Christoph Paasch bbf852b96e tcp: metrics: Delete all entries matching a certain destination
As we now can have multiple entries per destination-IP, the "ip
tcp_metrics delete address ADDRESS" command deletes all of them.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:38:18 -05:00
Christoph Paasch 8a59359cb8 tcp: metrics: New netlink attribute for src IP and dumped in netlink reply
This patch adds a new netlink attribute for the source-IP and appends it
to the netlink reply. Now, iproute2 can have access to the source-IP.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:38:18 -05:00
Christoph Paasch a544302820 tcp: metrics: Add source-address to tcp-metrics
We add the source-address to the tcp-metrics, so that different metrics
will be used per source/destination-pair. We use the destination-hash to
store the metric inside the hash-table. That way, deleting and dumping
via "ip tcp_metrics" is easy.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:38:18 -05:00
Christoph Paasch 324fd55a19 tcp: metrics: rename tcpm_addr to tcpm_daddr
As we will add also the source-address, we rename all accesses to the
tcp-metrics address to use "daddr".

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 17:38:18 -05:00
David S. Miller 1a6c1e5bd2 Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next
John W. Linville says:

====================
Please pull these updates for the 3.14 stream!

For the mac80211 bits, Johannes says:

"Felix adds some helper functions for P2P NoA software tracking, Joe
fixes alignment (but as this apparently never caused issues I didn't
send it to 3.13), Kyeyoon/Jouni add QoS-mapping support (a Hotspot 2.0
feature), Weilong fixed a bunch of checkpatch errors and I get to play
fire-fighter or so and clean up other people's locking issues. I also
added nl80211 vendor-specific events, as we'd discussed at the wireless
summit."

For the iwlwifi bits, Emmanuel says:

"I have here a rework of the interrupt handling to meet RT kernel
requirements - basically we don't take any lock in the primary interrupt
handler. This gave me a good reason to clean things up a bit on the way.
There is also a fix of the QoS mapping along with a few workarounds for
hardware / firmware issues that are hard to hit.
Three fixes suggested by static analyzers, and other various stuff.
Most importantly, I update the Copyright note to include the new year."

For the bluetooth bits, Gustavo says:

"More patches to 3.14. The bulk of changes here is the 6LoWPAN support for
Bluetooth LE Devices. The commits that touches net/ieee802154/ are already
acked by David Miller. Other than that we have some RFCOMM fixes and
improvements plus fixes and clean ups all over the tree."

Beyond that, ath9k, brcmfmac, mwifiex, and wil6210 get their usual
level of attention.  The wl1251 driver gets a number of updates,
and there are a handful of other bits here and there.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 14:53:33 -05:00
David S. Miller ef8570d859 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
Pablo Neira Ayuso says:

====================
This batch contains one single patch with the l2tp match
for xtables, from James Chapman.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-10 14:50:02 -05:00
John W. Linville 235f939228 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem
Conflicts:
	net/ieee802154/6lowpan.c
2014-01-10 10:59:40 -05:00
David S. Miller 751fcac19a Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nftables
Pablo Neira Ayuso says:

====================
nf_tables updates for net-next

The following patchset contains the following nf_tables updates,
mostly updates from Patrick McHardy, they are:

* Add the "inet" table and filter chain type for this new netfilter
  family: NFPROTO_INET. This special table/chain allows IPv4 and IPv6
  rules, this should help to simplify the burden in the administration
  of dual stack firewalls. This also includes several patches to prepare
  the infrastructure for this new table and a new meta extension to
  match the layer 3 and 4 protocol numbers, from Patrick McHardy.

* Load both IPv4 and IPv6 conntrack modules in nft_ct if the rule is used
  in NFPROTO_INET, as we don't certainly know which one would be used,
  also from Patrick McHardy.

* Do not allow to delete a table that contains sets, otherwise these
  sets become orphan, from Patrick McHardy.

* Hold a reference to the corresponding nf_tables family module when
  creating a table of that family type, to avoid the module deletion
  when in use, from Patrick McHardy.

* Update chain counters before setting the chain policy to ensure that
  we don't leave the chain in inconsistent state in case of errors (aka.
  restore chain atomicity). This also fixes a possible leak if it fails
  to allocate the chain counters if no counters are passed to be restored,
  from Patrick McHardy.

* Don't check for overflows in the table counter if we are just renaming
  a chain, from Patrick McHardy.

* Replay the netlink request after dropping the nfnl lock to load the
  module that supports provides a chain type, from Patrick.

* Fix chain type module references, from Patrick.

* Several cleanups, function renames, constification and code
  refactorizations also from Patrick McHardy.

* Add support to set the connmark, this can be used to set it based on
  the meta mark (similar feature to -j CONNMARK --restore), from
  Kristian Evensen.

* A couple of fixes to the recently added meta/set support and nft_reject,
  and fix missing chain type unregistration if we fail to register our
  the family table/filter chain type, from myself.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-09 21:36:01 -05:00
Pablo Neira Ayuso cf4dfa8539 netfilter: nf_tables: fix error path in the init functions
We have to unregister chain type if this fails to register netns.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 23:25:48 +01:00
James Chapman 74f77a6b2b netfilter: introduce l2tp match extension
Introduce an xtables add-on for matching L2TP packets. Supports L2TPv2
and L2TPv3 over IPv4 and IPv6. As well as filtering on L2TP tunnel-id
and session-id, the filtering decision can also include the L2TP
packet type (control or data), protocol version (2 or 3) and
encapsulation type (UDP or IP).

The most common use for this will likely be to filter L2TP data
packets of individual L2TP tunnels or sessions. While a u32 match can
be used, the L2TP protocol headers are such that field offsets differ
depending on bits set in the header, making rules for matching generic
L2TP connections cumbersome. This match extension takes care of all
that.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 21:36:39 +01:00
Wei Yongjun d0eb1f7e66 ip_tunnel: fix sparse non static symbol warning
Fixes the following sparse warning:

net/ipv4/ip_tunnel.c:116:18: warning:
 symbol 'tunnel_dst_check' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-09 14:31:47 -05:00
Wei Yongjun ece37c87ab openvswitch: Use kmem_cache_free() instead of kfree()
memory allocated by kmem_cache_alloc() should be freed using
kmem_cache_free(), not kfree().

Fixes: e298e50570 ('openvswitch: Per cpu flow stats.')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-09 14:26:39 -05:00
Patrick McHardy 3876d22dba netfilter: nf_tables: rename nft_do_chain_pktinfo() to nft_do_chain()
We don't encode argument types into function names and since besides
nft_do_chain() there are only AF-specific versions, there is no risk
of confusion.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:16 +01:00
Patrick McHardy 44a6f0df03 netfilter: nf_tables: prohibit deletion of a table with existing sets
We currently leak the set memory when deleting a table that still has
sets in it. Return EBUSY when attempting to delete a table with sets.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:16 +01:00
Patrick McHardy 7047f9d052 netfilter: nf_tables: take AF module reference when creating a table
The table refers to data of the AF module, so we need to make sure the
module isn't unloaded while the table exists.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:16 +01:00
Patrick McHardy c5c1f975ad netfilter: nf_tables: perform flags validation before table allocation
Simplifies error handling. Additionally use the correct type u32 for the
host byte order flags value.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:15 +01:00
Patrick McHardy fa2c1de0bb netfilter: nf_tables: minor nf_chain_type cleanups
Minor nf_chain_type cleanups:

- reorder struct to plug a hoe
- rename struct module member to "owner" for consistency
- rename nf_hookfn array to "hooks" for consistency
- reorder initializers for better readability

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:15 +01:00
Patrick McHardy 2a37d755b8 netfilter: nf_tables: constify chain type definitions and pointers
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:15 +01:00
Patrick McHardy 93b0806f00 netfilter: nf_tables: replay request after dropping locks to load chain type
To avoid races, we need to replay to request after dropping the nfnl_mutex
to auto-load the chain type module.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:14 +01:00
Patrick McHardy 88ce65a71c netfilter: nf_tables: add missing module references to chain types
In some cases we neither take a reference to the AF info nor to the
chain type, allowing the module to be unloaded while in use.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:14 +01:00
Patrick McHardy baae3e62f3 netfilter: nf_tables: fix chain type module reference handling
The chain type module reference handling makes no sense at all: we take
a reference immediately when the module is registered, preventing the
module from ever being unloaded.

Fix by taking a reference when we're actually creating a chain of the
chain type and release the reference when destroying the chain.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:14 +01:00
Patrick McHardy 758206760c netfilter: nf_tables: fix check for table overflow
The table use counter is only increased for new chains, so move the check
to the correct position.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:13 +01:00
Patrick McHardy 4401a86200 netfilter: nf_tables: restore chain change atomicity
Chain counter validation is performed after the chain policy has
potentially been changed. Move counter validation/setting before
changing of the chain policy to fix this.

Additionally fix a memory leak if chain counter allocation fails
for new chains, remove an unnecessary free_percpu() and move
counter allocation for new chains

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:13 +01:00
Patrick McHardy 57de2a0cd9 netfilter: nf_tables: split chain policy validation from actually setting it
Currently nf_tables_newchain() atomicity is broken because of having
validation of some netlink attributes performed after changing attributes
of the chain. The chain policy is (currently) fine, but split it up as
preparation for the following fixes and to avoid future mistakes.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:17:13 +01:00
Pablo Neira Ayuso b38895c577 netfilter: nft_meta: fix lack of validation of the input register
We have to validate that the input register is in the range of
allowed registers, otherwise we can take a incorrect register
value as input that may lead us to a crash.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 20:04:16 +01:00
Kristian Evensen c4ede3d382 netfilter: nft_ct: Add support to set the connmark
This patch adds kernel support for setting properties of tracked
connections. Currently, only connmark is supported. One use-case
for this feature is to provide the same functionality as
-j CONNMARK --save-mark in iptables.

Some restructuring was needed to implement the set op. The new
structure follows that of nft_meta.

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2014-01-09 19:07:44 +01:00
David S. Miller 54b553e2c1 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains three Netfilter updates, they are:

* Fix wrong usage of skb_header_pointer in the DCCP protocol helper that
  has been there for quite some time. It was resulting in copying the dccp
  header to a pointer allocated in the stack. Fortunately, this pointer
  provides room for the dccp header is 4 bytes long, so no crashes have been
  reported so far. From Daniel Borkmann.

* Use format string to print in the invocation of nf_log_packet(), again
  in the DCCP helper. Also from Daniel Borkmann.

* Revert "netfilter: avoid get_random_bytes call" as prandom32 does not
  guarantee enough entropy when being calling this at boot time, that may
  happen when reloading the rule.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-08 15:04:56 -05:00
Antonio Quartulli 42cb0bef01 batman-adv: set the isolation mark in the skb if needed
If a broadcast packet is coming from a client marked as
isolated, then mark the skb using the isolation mark so
that netfilter (or any other application) can recognise
them.

The mark is written in the skb based on the mask value:
only bits set in the mask are substitued by those in the
mark value

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:46 +01:00
Antonio Quartulli eceb22ae0b batman-adv: create helper function to get AP isolation status
The AP isolation status may be evaluated in different spots.
Create an helper function to avoid code duplication.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:45 +01:00
Antonio Quartulli 2d2fcc2a3f batman-adv: extend the ap_isolation mechanism
Change the AP isolation mechanism to not only "isolate" WIFI
clients but also all those marked with the more generic
"isolation flag" (BATADV_TT_CLIENT_ISOLA).

The result is that when AP isolation is on any unicast
packet originated by an "isolated" client and directed to
another "isolated" client is dropped at the source node.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:44 +01:00
Antonio Quartulli dd24ddb265 batman-adv: print the new BATADV_TT_CLIENT_ISOLA flag
Print the new BATADV_TT_CLIENT_ISOLA flag properly in the
Local and Global Translation Table output.

The character 'I' is used in the flags column to indicate
that the entry is marked as isolated.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:44 +01:00
Antonio Quartulli 9464d07188 batman-adv: mark a local client as isolated when needed
A client sending packets which mark matches the value
configured via sysfs has to be identified as isolated using
the TT_CLIENT_ISOLA flag.

The match is mask based, meaning that only bits set in the
mask are compared with those in the mark value.

If the configured mask is equal to 0 no operation is
performed.

Such flag is then advertised within the classic client
announcement mechanism.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:43 +01:00
Antonio Quartulli c42edfe382 batman-adv: add isolation_mark sysfs attribute
This attribute can be used to set and read the value and the
mask of the skb mark which will be used to classify the
source non-mesh client as ISOLATED. In this way a client can
be advertised as such and the mark can potentially be
restored at the receiving node before delivering the skb.

This can be helpful for creating network wide netfilter
policies.

This sysfs file expects a string of the shape "$mark/$mask".
Where $mark has to be a 32-bit number in any base, while
$mask must be a 32bit mask expressed in hex base. Only bits
in $mark covered by the bitmask are really stored.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:42 +01:00
Antonio Quartulli 6c413b1c22 batman-adv: send every DHCP packet as bat-unicast
In different situations it is possible that the DHCP server
or client uses broadcast Ethernet frames to send messages
to each other. The GW component in batman-adv takes care of
using bat-unicast packets to bring broadcast DHCP
Discover/Requests to the "best" server.

On the way back the DHCP server usually sends unicasts,
but upon client request it may decide to use broadcasts as
well.

This patch improves the GW component so that it now snoops
and sends as unicast all the DHCP packets, no matter if they
were generated by a DHCP server or client.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:42 +01:00
Antonio Quartulli 36484f84d5 batman-adv: remove parenthesis from return statements
Remove parenthesis around return expression as suggested by
checkpatch.

Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:41 +01:00
Antonio Quartulli 4e820e72db batman-adv: rename gw_deselect() to gw_reselect()
The function batadv_gw_deselect() is actually not deselecting
anything. It is just informing the GW code to perform a
re-election procedure when possible.
The current gateway is not being touched at all and therefore
the name of this function is rather misleading.

Rename it to batadv_gw_reselect() to batadv_gw_reselect()
to make its behaviour easier to grasp.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:41 +01:00
Antonio Quartulli f316318157 batman-adv: deselect current GW on client mode switch off
When switching from gw_mode client to either off or server
the current selected gateway has to be deselected.
In this way when client mode is enabled again a gateway
re-election is forced and a GW_ADD event is consequently
sent.

The current behaviour instead is to keep the current gateway
leading to no GW_ADD event when gw_mode client is selected
for a second time

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-01-08 20:49:40 +01:00
Antonio Quartulli ebf38fb7ab batman-adv: remove FSF address from GPL disclaimer
As suggested by checkpatch, remove all the references to the
FSF address since the kernel already has one reference in
its documentation.

In this way it is easier to update it in case of future
changes.

Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:39 +01:00
Antonio Quartulli 3fba7325bb batman-adv: don't switch byte order too often if not needed
If possible, operations like ntohs/ntohl should not be
performed too often. Use a variable to locally store the
converted value and then use it.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2014-01-08 20:49:39 +01:00
Antonio Quartulli a48bcacdb3 batman-adv: properly rename define in distributed arp table header file
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2014-01-08 20:49:38 +01:00
John W. Linville 300e5fd160 Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2014-01-08 13:44:29 -05:00
Ying Xue da7c224b1b net: xfrm: xfrm_policy: silence compiler warning
Fix below compiler warning:

net/xfrm/xfrm_policy.c:1644:12: warning: ‘xfrm_dst_alloc_copy’ defined but not used [-Wunused-function]

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-07 22:45:26 -05:00
Jon Paul Maloy 581465fa28 tipc: make link start event synchronous
When a link is created we delay the start event by launching it
to be executed later in a tasklet. As we hold all the
necessary locks at the moment of creation, and there is no risk
of deadlock or contention, this delay serves no purpose in the
current code.

We remove this obsolete indirection step, and the associated function
link_start(). At the same time, we rename the function tipc_link_stop()
to the more appropriate tipc_link_purge_queues().

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-07 18:44:26 -05:00
Ying Xue f9a2c80b8b tipc: introduce new spinlock to protect struct link_req
Currently, only 'bearer_lock' is used to protect struct link_req in
the function disc_timeout(). This is unsafe, since the member fields
'num_nodes' and 'timer_intv' might be accessed by below three different
threads simultaneously, none of them grabbing bearer_lock in the
critical region:

link_activate()
  tipc_bearer_add_dest()
    tipc_disc_add_dest()
      req->num_nodes++;

tipc_link_reset()
  tipc_bearer_remove_dest()
    tipc_disc_remove_dest()
      req->num_nodes--
      disc_update()
        read req->num_nodes
	write req->timer_intv

disc_timeout()
  read req->num_nodes
  read/write req->timer_intv

Without lock protection, the only symptom of a race is that discovery
messages occasionally may not be sent out. This is not fatal, since such
messages are best-effort anyway. On the other hand, since discovery
messages are not time critical, adding a protecting lock brings no
serious overhead either. So we add a new, dedicated spinlock in
order to guarantee absolute data consistency in link_req objects.
This also helps reduce the overall role of the bearer_lock, which
we want to remove completely in a later commit series.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-07 18:44:25 -05:00
Jon Paul Maloy b9d4c33935 tipc: remove 'has_redundant_link' flag from STATE link protocol messages
The flag 'has_redundant_link' is defined only in RESET and ACTIVATE
protocol messages. Due to an ambiguity in the protocol specification it
is currently also transferred in STATE messages. Its value is used to
initialize a link state variable, 'permit_changeover', which is used
to inhibit futile link failover attempts when it is known that the
peer node has no working links at the moment, although the local node
may still think it has one.

The fact that 'has_redundant_link' incorrectly is read from STATE
messages has the effect that 'permit_changeover' sometimes gets a wrong
value, and permanently blocks any links from being re-established. Such
failures can only occur in in dual-link systems, and are extremely rare.
This bug seems to have always been present in the code.

Furthermore, since commit b4b5610223
("tipc: Ensure both nodes recognize loss of contact between them"),
the 'permit_changeover' field serves no purpose any more. The task of
enforcing 'lost contact' cycles at both peer endpoints is now taken
by a new mechanism, using the flags WAIT_NODE_DOWN and WAIT_PEER_DOWN
in struct tipc_node to abort unnecessary failover attempts.

We therefore remove the 'has_redundant_link' flag from STATE messages,
as well as the now redundant 'permit_changeover' variable.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-07 18:44:25 -05:00