Once we have ovs-vxlan functionality, one UDP port can be assigned
to kernel-vxlan or ovs-vxlan port. Therefore following patch adds
vxlan demux functionality, so that vxlan or ovs module can
register for particular port.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Use iptunnel_pull_header() for better code sharing.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Restructure vxlan-socket management APIs so that it can be
shared between vxlan and ovs modules.
This patch does not change any functionality.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
v6-v7:
- get rid of zero refcnt vs from hashtable.
Signed-off-by: David S. Miller <davem@davemloft.net>
This is a regression introduced by:
commit fe5c3561e6
Author: stephen hemminger <stephen@networkplumber.org>
Date: Sat Jul 13 10:18:18 2013 -0700
vxlan: add necessary locking on device removal
The problem is that vxlan_dellink(), which is called with RTNL lock
held, tries to flush the workqueue synchronously, but apparently
igmp_join and igmp_leave work need to hold RTNL lock too, therefore we
have a soft lockup!
As suggested by Stephen, probably the flush_workqueue can just be
removed and let the normal refcounting work. The workqueue has a
reference to device and socket, therefore the cleanups should work
correctly.
Suggested-by: Stephen Hemminger <stephen@networkplumber.org>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Tested-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This is a regression introduced by:
commit 3fc2de2fab
Author: stephen hemminger <stephen@networkplumber.org>
Date: Thu Jul 18 08:40:15 2013 -0700
vxlan: fix igmp races
Before this commit, the old code was:
if (vxlan_group_used(vn, vxlan->default_dst.remote_ip))
ip_mc_join_group(sk, &mreq);
else
ip_mc_leave_group(sk, &mreq);
therefore we shoud check vxlan_group_used(), not its opposite,
for igmp_join.
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vxlan remote list is protected by RCU and guaranteed to be non-empty.
Split out the rcu and non-rcu access to the list to fix warning
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support to replace an existing entry found in the
vxlan fdb database. The entry in question is identified
by its unicast mac address and the destination information
is changed. If the entry is not found, it is added in the
forwarding database. This is similar to changing an entry
in the neighbour table.
Multicast mac addresses can not be changed with the replace
option.
This is useful for virtual machine migration when the
destination of a target virtual machine changes. The replace
feature can be used instead of delete followed by add.
Resubmitted because net-next was closed last week.
Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There are two race conditions in existing code for doing IGMP
management in workqueue in vxlan. First, the vxlan_group_used
function checks the list of vxlan's without any protection, and
it is possible for open followed by close to occur before the
igmp work queue runs.
To solve these move the check into vxlan_open/stop so it is
protected by RTNL. And split into two work structures so that
there is no racy reference to underlying device state.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix memory leaks and other badness from VXLAN network namespace
teardown. When network namespace is removed, all the vxlan devices should
be unregistered (not closed).
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Reviewed-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The socket management is now done in workqueue (outside of RTNL)
and protected by vn->sock_lock. There were two possible bugs, first
the vxlan device was removed from the VNI hash table per socket without
holding lock. And there was a race when device is created and the workqueue
could run after deletion.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The zero MAC entry in the fdb is used as default destination. With
multiple default destinations it is possible to use vxlan in
environments that disable multicast on the infrastructure level, e.g.
public clouds.
Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
When the last item is deleted from the remote destinations list, the
fdb entry is destroyed.
Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
which will be reused by vxlan_fdb_delete
Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
which will be reused by vxlan_fdb_delete
Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Fix following sparse warnings.
drivers/net/vxlan.c:238:44: warning: incorrect type in argument 3 (different base types)
drivers/net/vxlan.c:238:44: expected restricted __be32 [usertype] value
drivers/net/vxlan.c:238:44: got unsigned int const [unsigned] [usertype] remote_vni
drivers/net/vxlan.c:1735:18: warning: incorrect type in initializer (different signedness)
drivers/net/vxlan.c:1735:18: expected int *id
drivers/net/vxlan.c:1735:18: got unsigned int static [toplevel] *<noident>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
For the notification code, a couple of places build fdb entries on
the stack, use structure initialization instead and fix formatting.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Based on initial work by Mike Rapoport <mike.rapoport@ravellosystems.com>
Use list macros and RCU for tracking multiple remotes.
Note: this code assumes list always has at least one entry,
because delete is not supported.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
The function vxlan_xmit_one always returns NETDEV_TX_OK, so there
is no point in keeping track of return values etc.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Put destruction of per-cpu statistics removal in
ndo_uninit since it is created by ndo_init.
This also avoids any problems that might be cause by destructor
being called after module removed.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
It is possible for two cpu's to race creating vxlan device.
For most cases this is harmless, but the ability to assign "next
avaliable vxlan device" relies on rtnl lock being held across the
whole operation. Therfore two instances of calling:
ip li add vxlan%d vxlan ...
could collide and create two devices with same name.
To fix this defer creation of socket to a work queue, and
handle possible races there. Introduce a lock to ensure that
changes to vxlan socket hash list is SMP safe.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Do join/leave from work queue to avoid lock inversion problems
between normal socket and RTNL. The code comes out cleaner
as well.
Uses Cong Wang's suggestion to turn refcnt into a real atomic
since now need to handle case where last use of socket is IGMP
worker.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Switch to using a per module work queue so that all the socket
deletion callbacks are done when module is removed.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
If vxlan is removed with active vxlan's it would crash because
rtnl_link_unregister (which calls vxlan_dellink), was invoked
before unregister_pernet_device (which calls vxlan_stop).
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Refactor various ip tunnels xmit functions and extend iptunnel_xmit()
so that there is more code sharing.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
drivers/net/wireless/ath/ath9k/Kconfig
drivers/net/xen-netback/netback.c
net/batman-adv/bat_iv_ogm.c
net/wireless/nl80211.c
The ath9k Kconfig conflict was a change of a Kconfig option name right
next to the deletion of another option.
The xen-netback conflict was overlapping changes involving the
handling of the notify list in xen_netbk_rx_action().
Batman conflict resolution provided by Antonio Quartulli, basically
keep everything in both conflict hunks.
The nl80211 conflict is a little more involved. In 'net' we added a
dynamic memory allocation to nl80211_dump_wiphy() to fix a race that
Linus reported. Meanwhile in 'net-next' the handlers were converted
to use pre and post doit handlers which use a flag to determine
whether to hold the RTNL mutex around the operation.
However, the dump handlers to not use this logic. Instead they have
to explicitly do the locking. There were apparent bugs in the
conversion of nl80211_dump_wiphy() in that we were not dropping the
RTNL mutex in all the return paths, and it seems we very much should
be doing so. So I fixed that whilst handling the overlapping changes.
To simplify the initial returns, I take the RTNL mutex after we try
to allocate 'tb'.
Signed-off-by: David S. Miller <davem@davemloft.net>
The check introduced by:
commit 26a41ae604
Author: stephen hemminger <stephen@networkplumber.org>
Date: Mon Jun 17 12:09:58 2013 -0700
vxlan: only migrate dynamic FDB entries
was not correct because it is checking flag about type of FDB
entry, rather than the state (dynamic versus static). The confusion
arises because vxlan is reusing values from bridge, and bridge is
reusing values from neighbour table, and easy to get lost in translation.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
If skb_clone fails if out of memory then just skip the fanout.
Problem was introduced in 3.10 with:
commit 6681712d67
Author: David Stevens <dlstevens@us.ibm.com>
Date: Fri Mar 15 04:35:51 2013 +0000
vxlan: generalize forwarding tables
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Only migrate dynamic forwarding table entries, don't modify
static entries. If packet received from incorrect source IP address
assume it is an imposter and drop it.
This patch applies only to -net, a different patch would be needed for earlier
kernels since the NTF_SELF flag was introduced with 3.10.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
It is possible for a packet to arrive during vxlan_stop(), and
have a dynamic entry created. Close this by checking if device
is up.
CPU1 CPU2
vxlan_stop
vxlan_flush
hash_lock acquired
vxlan_encap_recv
vxlan_snoop
waiting for hash_lock
hash_lock relased
vxlan_flush done
hash_lock acquired
vxlan_fdb_create
This is a day-one bug in vxlan goes back to 3.7.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
When vxlan is compiled as builtin, its init code
runs before IPv6 init, this could cause problems
if we create IPv6 socket in the latter patch.
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
'unsigned int' is slightly better.
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Merge net into net-next because some upcoming net-next changes
build on top of bug fixes that went into net.
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix some instances where vxlan fdb 'used' field is not updated after the entry
is used.
v2: rename vxlan_find_mac() as __vxlan_find_mac() and create a new vxlan_find_mac()
that also updates ->used field.
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The commit 823aa873bc
Author: stephen hemminger <stephen@networkplumber.org>
Date: Sat Apr 27 11:31:57 2013 +0000
vxlan: allow choosing destination port per vxlan
introduced per-vxlan UDP port configuration but only did half of the
necessary work. It added per vxlan destination for sending, but
overlooked the handling of multiple ports for incoming traffic.
This patch changes the listening port management to handle multiple
incoming UDP ports. The earlier per-namespace structure is now a hash
list per namespace.
It is also now possible to define the same virtual network id
but with different UDP port values which can be useful for migration.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Since SKB_GSO_* flags are set by appropriate gso_segment callback
in TCP/UDP layer.
CC: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Allow configuring the default destination port on a per-device basis.
Adds new netlink paramater IFLA_VXLAN_PORT to allow setting destination
port when creating new vxlan.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rather than computing source port and returning it in host order
then swapping later, go ahead and compute it in network order to
start with. Cleaner and less error prone.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Source compatiability for build iproute2 was broken by:
commit c7995c43fa
Author: Atzm Watanabe <atzm@stratosphere.co.jp>
vxlan: Allow setting destination to unicast address.
Since this commit has not made it upstream (still net-next),
and better to avoid gratitious changes to exported API's;
go back to original definition, and add a comment.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The NDA_PORT attribute was added, but the author wasn't careful
about width (port is 16 bits), or byte order. The attribute was
being dumped as 16 bits, but only 32 bit value would be accepted
when setting up a device. Also, the remote port is in network
byte order and was being compared with default port in host byte
order.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The default port for VXLAN is not same as IANA value.
Document this.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pravin B Shelar