Qdisc locks are initialized in the same function, qdisc_alloc(), so
lockdep can't distinguish tx qdisc lock from rx and reports "possible
recursive locking detected" when both these locks are taken eg. while
using act_mirred with ifb. This looks like a false positive. Anyway,
after this patch these locks will be reported more exactly.
Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Based upon initial discovery and patch by Jarek Poplawski.
The qdisc watchdogs can be attached to any qdisc, not just the root,
so make sure we schedule the correct one.
CBQ has a similar bug.
Signed-off-by: David S. Miller <davem@davemloft.net>
Based upon a bug report by Josip Rodin.
Packet schedulers should only return NET_XMIT_DROP iff
the packet really was dropped. If the packet does reach
the device after we return NET_XMIT_DROP then TCP can
crash because it depends upon the enqueue path return
values being accurate.
Signed-off-by: David S. Miller <davem@davemloft.net>
When get receiving interface index while no message is received,
the bounded device's index of the socket should be returned.
RFC 3542:
Issuing getsockopt() for the above options will return the sticky
option value i.e., the value set with setsockopt(). If no sticky
option value has been set getsockopt() will return the following
values:
- For the IPV6_PKTINFO option, it will return an in6_pktinfo
structure with ipi6_addr being in6addr_any and ipi6_ifindex being
zero.
Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Use return value from inner qdisc requeue when value returned isn't
NET_XMIT_SUCCESS, instead of always returning NET_XMIT_DROP.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
We can now kill them synchronously with all of the
previous dev_deactivate() cures.
This makes netdev destruction and shutdown saner as
the qdiscs hold references to the device.
Signed-off-by: David S. Miller <davem@davemloft.net>
From: Jarek Poplawski <jarkao2@gmail.com>
When we are destroying non-root qdiscs, we need to lock
the root of the qdisc tree not the the qdisc itself.
Signed-off-by: David S. Miller <davem@davemloft.net>
The condition under which the previous qdisc has no more references
after we've attached &noop_qdisc is that both RUNNING and SCHED
are both seen clear while holding the root lock.
So just make specifically that check in the polling loop, instead
of this overly complex "check without then check with lock held"
sequence.
Signed-off-by: David S. Miller <davem@davemloft.net>
Change handling of the __QDISC_STATE_SCHED flag in net_tx_action() to
enable proper control in dev_deactivate(). Now, if this flag is seen
as unset under root_lock means a qdisc can't be netif_scheduled.
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This new state lets dev_deactivate() mark a qdisc as having been
deactivated.
dev_queue_xmit() and ing_filter() check for this bit and do not
try to process the qdisc if the bit is set.
dev_deactivate() polls the qdisc after setting the bit, waiting
for both __QDISC_STATE_RUNNING and __QDISC_STATE_SCHED to clear.
This isn't perfect yet, but subsequent changesets will make it so.
This part is just one piece of the puzzle.
Signed-off-by: David S. Miller <davem@davemloft.net>
There's an skb_copy_datagram_iovec() to copy out of a paged skb, but
nothing the other way around (because we don't do that).
We want to allocate big skbs in tun.c, so let's add the function.
It's a carbon copy of skb_copy_datagram_iovec() with enough changes to
be annoying.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
skb_gso_segment didn't preserve some attributes in the original skb
such as the netfilter fields. This was harmless until they were used
which is the case for packets going through lo.
This patch makes it call __copy_skb_header which also picks up some
other missing attributes.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add more ethtool generic operations to dump the bridge offload
settings.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Let me first state that disabling the route cache hash rebuild
should not be done without extensive analysis on the risk profile
and careful deliberation.
However, there are times when this can be done safely or for
testing. For example, when you have mechanisms for ensuring
that offending parties do not exist in your network.
This patch lets the user disable the rebuild if the interval is
set to zero. This also incidentally fixes a divide-by-zero error
with name-spaces.
In addition, this patch makes the effect of an interval change
immediate rather than it taking effect at the next rebuild as
is currently the case.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix a bug with spin_lock_bh() inserted instead of spin_unlock_bh() by
some recent patch.
Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
ipv6_dev_get_saddr() blindly de-references dst_dev to get the network
namespace, but some callers might pass NULL. Change callers to pass a
namespace pointer instead.
Signed-off-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch makes the multicast socket to be per namespace.
When a network namespace is created, other than the init_net and a
multicast packet is received, the kernel goes to a hang or a kernel panic.
How to reproduce ?
* create a child network namespace
* create a pair virtual device veth
* ip link add type veth
* move one side to the pair network device to the child namespace
* ip link set netns <childpid> dev veth1
* ping -I veth0 224.0.0.1
The bug appears because the function ip_mc_init_dev does not initialize
the different multicast fields as it exits because it is not the init_net.
BUG: soft lockup - CPU#0 stuck for 61s! [avahi-daemon:2695]
Modules linked in:
irq event stamp: 50350
hardirqs last enabled at (50349): [<c03ee949>] _spin_unlock_irqrestore+0x34/0x39
hardirqs last disabled at (50350): [<c03ec639>] schedule+0x9f/0x5ff
softirqs last enabled at (45712): [<c0374d4b>] ip_setsockopt+0x8e7/0x909
softirqs last disabled at (45710): [<c03ee682>] _spin_lock_bh+0x8/0x27
Pid: 2695, comm: avahi-daemon Not tainted (2.6.27-rc2-00029-g0872073 #3)
EIP: 0060:[<c03ee47c>] EFLAGS: 00000297 CPU: 0
EIP is at __read_lock_failed+0x8/0x10
EAX: c4f38810 EBX: c4f38810 ECX: 00000000 EDX: c04cc22e
ESI: fb0000e0 EDI: 00000011 EBP: 0f02000a ESP: c4e3faa0
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
CR0: 8005003b CR2: 44618a40 CR3: 04e37000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
[<c02311f8>] ? _raw_read_lock+0x23/0x25
[<c0390666>] ? ip_check_mc+0x1c/0x83
[<c036d478>] ? ip_route_input+0x229/0xe92
[<c022e2e4>] ? trace_hardirqs_on_thunk+0xc/0x10
[<c0104c9c>] ? do_IRQ+0x69/0x7d
[<c0102e64>] ? restore_nocheck_notrace+0x0/0xe
[<c036fdba>] ? ip_rcv+0x227/0x505
[<c0358764>] ? netif_receive_skb+0xfe/0x2b3
[<c03588d2>] ? netif_receive_skb+0x26c/0x2b3
[<c035af31>] ? process_backlog+0x73/0xbd
[<c035a8cd>] ? net_rx_action+0xc1/0x1ae
[<c01218a8>] ? __do_softirq+0x7b/0xef
[<c0121953>] ? do_softirq+0x37/0x4d
[<c035b50d>] ? dev_queue_xmit+0x3d4/0x40b
[<c0122037>] ? local_bh_enable+0x96/0xab
[<c035b50d>] ? dev_queue_xmit+0x3d4/0x40b
[<c012181e>] ? _local_bh_enable+0x79/0x88
[<c035fcb8>] ? neigh_resolve_output+0x20f/0x239
[<c0373118>] ? ip_finish_output+0x1df/0x209
[<c0373364>] ? ip_dev_loopback_xmit+0x62/0x66
[<c0371db5>] ? ip_local_out+0x15/0x17
[<c0372013>] ? ip_push_pending_frames+0x25c/0x2bb
[<c03891b8>] ? udp_push_pending_frames+0x2bb/0x30e
[<c038a189>] ? udp_sendmsg+0x413/0x51d
[<c038a1a9>] ? udp_sendmsg+0x433/0x51d
[<c038f927>] ? inet_sendmsg+0x35/0x3f
[<c034f092>] ? sock_sendmsg+0xb8/0xd1
[<c012d554>] ? autoremove_wake_function+0x0/0x2b
[<c022e6de>] ? copy_from_user+0x32/0x5e
[<c022e6de>] ? copy_from_user+0x32/0x5e
[<c034f238>] ? sys_sendmsg+0x18d/0x1f0
[<c0175e90>] ? pipe_write+0x3cb/0x3d7
[<c0170347>] ? do_sync_write+0xbe/0x105
[<c012d554>] ? autoremove_wake_function+0x0/0x2b
[<c03503b2>] ? sys_socketcall+0x176/0x1b0
[<c01085ea>] ? syscall_trace_enter+0x6c/0x7b
[<c0102e1a>] ? syscall_call+0x7/0xb
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
gen_kill_estimator() required rtnl_lock() protection, but since it is
moved to an RCU callback __qdisc_destroy() let's use est_lock instead.
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Based upon discussions with Jarek P. and Herbert Xu.
First, we're testing the wrong qdisc. We just reset the device
queue qdiscs to &noop_qdisc and checking it's state is completely
pointless here.
We want to wait until the previous qdisc that was sitting at
the ->qdisc pointer is not busy any more. And that would be
->qdisc_sleeping.
Because of how we propagate the samples qdisc pointer down into
qdisc_run and friends via per-cpu ->output_queue and netif_schedule,
we have to wait also for the __QDISC_STATE_SCHED bit to clear as
well.
Signed-off-by: David S. Miller <davem@davemloft.net>
Recent changes introduced a bug in htb_delete(): cl->parent->children
counter update misses checking cl->parent for NULL, which is used for
root classes, so deleting them causes an oops.
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
With the new multi-queue transmit code, it is possible to accidentally
make pktgen pick a non-existing tx queue simply by using a stale
script to drive pktgen. Access to this non-existing tx queue will
then trigger a bad memory access and kill the machine.
For example, setting "queue_map_max 2" will cause my machine to die
when accessing a garbage spinlock in the non-existing tx queue:
BUG: spinlock bad magic on CPU#0, kpktgend_0/564
lock: ffff88001ddf6718, .magic: ffffffff, .owner: /-1, .owner_cpu: 0
Pid: 564, comm: kpktgend_0 Not tainted 2.6.27-rc3 #35
Call Trace:
[<ffffffff803a1228>] spin_bug+0xa4/0xac
[<ffffffff803a1253>] _raw_spin_lock+0x23/0x123
[<ffffffff8055b06f>] _spin_lock_bh+0x17/0x1b
[<ffffffff804cb57d>] pktgen_thread_worker+0xa97/0x1002
[<ffffffff8022874d>] ? finish_task_switch+0x38/0x97
[<ffffffff80242077>] ? autoremove_wake_function+0x0/0x36
[<ffffffff80242077>] ? autoremove_wake_function+0x0/0x36
[<ffffffff804caae6>] ? pktgen_thread_worker+0x0/0x1002
[<ffffffff80241a40>] kthread+0x44/0x6d
[<ffffffff8020c399>] child_rip+0xa/0x11
[<ffffffff802419fc>] ? kthread+0x0/0x6d
[<ffffffff8020c38f>] ? child_rip+0x0/0x11
The attached patch adds some sanity checking to prevent
these sorts of configuration errors.
Signed-off-by: Andrew Gallatin <gallatin@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Small fix removing an unnecessary intermediate variable.
Signed-off-by: Jean-Christophe DUBOIS <jcd@tribudubois.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jarek Poplawski
David S. Miller
Yang Hongyang
Jussi Kivilinna
Rusty Russell
Herbert Xu
Stephen Hemminger
Brian Haley
Daniel Lezcano
Andrew Gallatin
Arnaldo Carvalho de Melo
Jean-Christophe DUBOIS