linux-stable.git/include/net, branch linux-4.15.y

Bluetooth: Fix connection if directed advertising and privacy is used

2018-04-19T06:55:12+00:00

commit 082f2300cfa1a3d9d5221c38c5eba85d4ab98bd8 upstream.

Local random address needs to be updated before creating connection if
RPA from LE Direct Advertising Report was resolved in host. Otherwise
remote device might ignore connection request due to address mismatch.

This was affecting following qualification test cases:
GAP/CONN/SCEP/BV-03-C, GAP/CONN/GCEP/BV-05-C, GAP/CONN/DCEP/BV-05-C

Before patch:
< HCI Command: LE Set Random Address (0x08|0x0005) plen 6          #11350 [hci0] 84680.231216
        Address: 56:BC:E8:24:11:68 (Resolvable)
          Identity type: Random (0x01)
          Identity: F2:F1:06:3D:9C:42 (Static)
> HCI Event: Command Complete (0x0e) plen 4                        #11351 [hci0] 84680.246022
      LE Set Random Address (0x08|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7         #11352 [hci0] 84680.246417
        Type: Passive (0x00)
        Interval: 60.000 msec (0x0060)
        Window: 30.000 msec (0x0030)
        Own address type: Random (0x01)
        Filter policy: Accept all advertisement, inc. directed unresolved RPA (0x02)
> HCI Event: Command Complete (0x0e) plen 4                        #11353 [hci0] 84680.248854
      LE Set Scan Parameters (0x08|0x000b) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2             #11354 [hci0] 84680.249466
        Scanning: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4                        #11355 [hci0] 84680.253222
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 18                          #11356 [hci0] 84680.458387
      LE Direct Advertising Report (0x0b)
        Num reports: 1
        Event type: Connectable directed - ADV_DIRECT_IND (0x01)
        Address type: Random (0x01)
        Address: 53:38:DA:46:8C:45 (Resolvable)
          Identity type: Public (0x00)
          Identity: 11:22:33:44:55:66 (OUI 11-22-33)
        Direct address type: Random (0x01)
        Direct address: 7C:D6:76:8C:DF:82 (Resolvable)
          Identity type: Random (0x01)
          Identity: F2:F1:06:3D:9C:42 (Static)
        RSSI: -74 dBm (0xb6)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2             #11357 [hci0] 84680.458737
        Scanning: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4                        #11358 [hci0] 84680.469982
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25          #11359 [hci0] 84680.470444
        Scan interval: 60.000 msec (0x0060)
        Scan window: 60.000 msec (0x0060)
        Filter policy: White list is not used (0x00)
        Peer address type: Random (0x01)
        Peer address: 53:38:DA:46:8C:45 (Resolvable)
          Identity type: Public (0x00)
          Identity: 11:22:33:44:55:66 (OUI 11-22-33)
        Own address type: Random (0x01)
        Min connection interval: 30.00 msec (0x0018)
        Max connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Min connection length: 0.000 msec (0x0000)
        Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4                          #11360 [hci0] 84680.474971
      LE Create Connection (0x08|0x000d) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection Cancel (0x08|0x000e) plen 0    #11361 [hci0] 84682.545385
> HCI Event: Command Complete (0x0e) plen 4                        #11362 [hci0] 84682.551014
      LE Create Connection Cancel (0x08|0x000e) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 19                          #11363 [hci0] 84682.551074
      LE Connection Complete (0x01)
        Status: Unknown Connection Identifier (0x02)
        Handle: 0
        Role: Master (0x00)
        Peer address type: Public (0x00)
        Peer address: 00:00:00:00:00:00 (OUI 00-00-00)
        Connection interval: 0.00 msec (0x0000)
        Connection latency: 0 (0x0000)
        Supervision timeout: 0 msec (0x0000)
        Master clock accuracy: 0x00

After patch:
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7    #210 [hci0] 667.152459
        Type: Passive (0x00)
        Interval: 60.000 msec (0x0060)
        Window: 30.000 msec (0x0030)
        Own address type: Random (0x01)
        Filter policy: Accept all advertisement, inc. directed unresolved RPA (0x02)
> HCI Event: Command Complete (0x0e) plen 4                   #211 [hci0] 667.153613
      LE Set Scan Parameters (0x08|0x000b) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2        #212 [hci0] 667.153704
        Scanning: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4                   #213 [hci0] 667.154584
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 18                     #214 [hci0] 667.182619
      LE Direct Advertising Report (0x0b)
        Num reports: 1
        Event type: Connectable directed - ADV_DIRECT_IND (0x01)
        Address type: Random (0x01)
        Address: 50:52:D9:A6:48:A0 (Resolvable)
          Identity type: Public (0x00)
          Identity: 11:22:33:44:55:66 (OUI 11-22-33)
        Direct address type: Random (0x01)
        Direct address: 7C:C1:57:A5:B7:A8 (Resolvable)
          Identity type: Random (0x01)
          Identity: F4:28:73:5D:38:B0 (Static)
        RSSI: -70 dBm (0xba)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2       #215 [hci0] 667.182704
        Scanning: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4                  #216 [hci0] 667.183599
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Random Address (0x08|0x0005) plen 6    #217 [hci0] 667.183645
        Address: 7C:C1:57:A5:B7:A8 (Resolvable)
          Identity type: Random (0x01)
          Identity: F4:28:73:5D:38:B0 (Static)
> HCI Event: Command Complete (0x0e) plen 4                  #218 [hci0] 667.184590
      LE Set Random Address (0x08|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25    #219 [hci0] 667.184613
        Scan interval: 60.000 msec (0x0060)
        Scan window: 60.000 msec (0x0060)
        Filter policy: White list is not used (0x00)
        Peer address type: Random (0x01)
        Peer address: 50:52:D9:A6:48:A0 (Resolvable)
          Identity type: Public (0x00)
          Identity: 11:22:33:44:55:66 (OUI 11-22-33)
        Own address type: Random (0x01)
        Min connection interval: 30.00 msec (0x0018)
        Max connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Min connection length: 0.000 msec (0x0000)
        Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4                    #220 [hci0] 667.186558
      LE Create Connection (0x08|0x000d) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 19                    #221 [hci0] 667.485824
      LE Connection Complete (0x01)
        Status: Success (0x00)
        Handle: 0
        Role: Master (0x00)
        Peer address type: Random (0x01)
        Peer address: 50:52:D9:A6:48:A0 (Resolvable)
          Identity type: Public (0x00)
          Identity: 11:22:33:44:55:66 (OUI 11-22-33)
        Connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Master clock accuracy: 0x07
@ MGMT Event: Device Connected (0x000b) plen 13          {0x0002} [hci0] 667.485996
        LE Address: 11:22:33:44:55:66 (OUI 11-22-33)
        Flags: 0x00000000
        Data length: 0

Signed-off-by: Szymon Janc 
Signed-off-by: Marcel Holtmann 
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

slip: Check if rstate is initialized before uncompressing

2018-04-19T06:55:07+00:00

[ Upstream commit 3f01ddb962dc506916c243f9524e8bef97119b77 ]

On receiving a packet the state index points to the rstate which must be
used to fill up IP and TCP headers. But if the state index points to a
rstate which is unitialized, i.e. filled with zeros, it gets stuck in an
infinite loop inside ip_fast_csum trying to compute the ip checsum of a
header with zero length.

89.666953:   <2> [] slhc_uncompress+0x464/0x468
89.666965:   <2> [] ppp_receive_nonmp_frame+0x3b4/0x65c
89.666978:   <2> [] ppp_receive_frame+0x64/0x7e0
89.666991:   <2> [] ppp_input+0x104/0x198
89.667005:   <2> [] pppopns_recv_core+0x238/0x370
89.667027:   <2> [] __sk_receive_skb+0xdc/0x250
89.667040:   <2> [] pppopns_recv+0x44/0x60
89.667053:   <2> [] __sock_queue_rcv_skb+0x16c/0x24c
89.667065:   <2> [] sock_queue_rcv_skb+0x2c/0x38
89.667085:   <2> [] raw_rcv+0x124/0x154
89.667098:   <2> [] raw_local_deliver+0x1e0/0x22c
89.667117:   <2> [] ip_local_deliver_finish+0x70/0x24c
89.667131:   <2> [] ip_local_deliver+0x100/0x10c

./scripts/faddr2line vmlinux slhc_uncompress+0x464/0x468 output:
 ip_fast_csum at arch/arm64/include/asm/checksum.h:40
 (inlined by) slhc_uncompress at drivers/net/slip/slhc.c:615

Adding a variable to indicate if the current rstate is initialized. If
such a packet arrives, move to toss state.

Signed-off-by: Tejaswi Tanikella 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

sch_netem: fix skb leak in netem_enqueue()

2018-03-31T16:05:43+00:00

[ Upstream commit 35d889d10b649fda66121891ec05eca88150059d ]

When we exceed current packets limit and we have more than one
segment in the list returned by skb_gso_segment(), netem drops
only the first one, skipping the rest, hence kmemleak reports:

unreferenced object 0xffff880b5d23b600 (size 1024):
  comm "softirq", pid 0, jiffies 4384527763 (age 2770.629s)
  hex dump (first 32 bytes):
    00 80 23 5d 0b 88 ff ff 00 00 00 00 00 00 00 00  ..#]............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000d8a19b9d>] __alloc_skb+0xc9/0x520
    [<000000001709b32f>] skb_segment+0x8c8/0x3710
    [<00000000c7b9bb88>] tcp_gso_segment+0x331/0x1830
    [<00000000c921cba1>] inet_gso_segment+0x476/0x1370
    [<000000008b762dd4>] skb_mac_gso_segment+0x1f9/0x510
    [<000000002182660a>] __skb_gso_segment+0x1dd/0x620
    [<00000000412651b9>] netem_enqueue+0x1536/0x2590 [sch_netem]
    [<0000000005d3b2a9>] __dev_queue_xmit+0x1167/0x2120
    [<00000000fc5f7327>] ip_finish_output2+0x998/0xf00
    [<00000000d309e9d3>] ip_output+0x1aa/0x2c0
    [<000000007ecbd3a4>] tcp_transmit_skb+0x18db/0x3670
    [<0000000042d2a45f>] tcp_write_xmit+0x4d4/0x58c0
    [<0000000056a44199>] tcp_tasklet_func+0x3d9/0x540
    [<0000000013d06d02>] tasklet_action+0x1ca/0x250
    [<00000000fcde0b8b>] __do_softirq+0x1b4/0x5a3
    [<00000000e7ed027c>] irq_exit+0x1e2/0x210

Fix it by adding the rest of the segments, if any, to skb 'to_free'
list. Add new __qdisc_drop_all() and qdisc_drop_all() functions
because they can be useful in the future if we need to drop segmented
GSO packets in other places.

Fixes: 6071bd1aa13e ("netem: Segment GSO packets on enqueue")
Signed-off-by: Alexey Kodanev 
Acked-by: Neil Horman 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

udplite: fix partial checksum initialization

2018-03-09T06:47:35+00:00

[ Upstream commit 15f35d49c93f4fa9875235e7bf3e3783d2dd7a1b ]

Since UDP-Lite is always using checksum, the following path is
triggered when calculating pseudo header for it:

  udp4_csum_init() or udp6_csum_init()
    skb_checksum_init_zero_check()
      __skb_checksum_validate_complete()

The problem can appear if skb->len is less than CHECKSUM_BREAK. In
this particular case __skb_checksum_validate_complete() also invokes
__skb_checksum_complete(skb). If UDP-Lite is using partial checksum
that covers only part of a packet, the function will return bad
checksum and the packet will be dropped.

It can be fixed if we skip skb_checksum_init_zero_check() and only
set the required pseudo header checksum for UDP-Lite with partial
checksum before udp4_csum_init()/udp6_csum_init() functions return.

Fixes: ed70fcfcee95 ("net: Call skb_checksum_init in IPv4")
Fixes: e4f45b7f40bd ("net: Call skb_checksum_init in IPv6")
Signed-off-by: Alexey Kodanev 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

net_sched: get rid of rcu_barrier() in tcf_block_put_ext()

2018-02-12T06:07:21+00:00

[ Upstream commit efbf78973978b0d25af59bc26c8013a942af6e64 ]

Both Eric and Paolo noticed the rcu_barrier() we use in
tcf_block_put_ext() could be a performance bottleneck when
we have a lot of tc classes.

Paolo provided the following to demonstrate the issue:

tc qdisc add dev lo root htb
for I in `seq 1 1000`; do
        tc class add dev lo parent 1: classid 1:$I htb rate 100kbit
        tc qdisc add dev lo parent 1:$I handle $((I + 1)): htb
        for J in `seq 1 10`; do
                tc filter add dev lo parent $((I + 1)): u32 match ip src 1.1.1.$J
        done
done
time tc qdisc del dev root

real    0m54.764s
user    0m0.023s
sys     0m0.000s

The rcu_barrier() there is to ensure we free the block after all chains
are gone, that is, to queue tcf_block_put_final() at the tail of workqueue.
We can achieve this ordering requirement by refcnt'ing tcf block instead,
that is, the tcf block is freed only when the last chain in this block is
gone. This also simplifies the code.

Paolo reported after this patch we get:

real    0m0.017s
user    0m0.000s
sys     0m0.017s

Tested-by: Paolo Abeni 
Cc: Eric Dumazet 
Cc: Jiri Pirko 
Cc: Jamal Hadi Salim 
Signed-off-by: Cong Wang 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

net: don't call update_pmtu unconditionally

2018-01-25T21:27:34+00:00

Some dst_ops (e.g. md_dst_ops)) doesn't set this handler. It may result to:
"BUG: unable to handle kernel NULL pointer dereference at           (null)"

Let's add a helper to check if update_pmtu is available before calling it.

Fixes: 52a589d51f10 ("geneve: update skb dst pmtu on tx path")
Fixes: a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path")
CC: Roman Kapl 
CC: Xin Long 
Signed-off-by: Nicolas Dichtel 
Signed-off-by: David S. Miller

net: tcp: close sock if net namespace is exiting

2018-01-25T15:56:45+00:00

When a tcp socket is closed, if it detects that its net namespace is
exiting, close immediately and do not wait for FIN sequence.

For normal sockets, a reference is taken to their net namespace, so it will
never exit while the socket is open.  However, kernel sockets do not take a
reference to their net namespace, so it may begin exiting while the kernel
socket is still open.  In this case if the kernel socket is a tcp socket,
it will stay open trying to complete its close sequence.  The sock's dst(s)
hold a reference to their interface, which are all transferred to the
namespace's loopback interface when the real interfaces are taken down.
When the namespace tries to take down its loopback interface, it hangs
waiting for all references to the loopback interface to release, which
results in messages like:

unregister_netdevice: waiting for lo to become free. Usage count = 1

These messages continue until the socket finally times out and closes.
Since the net namespace cleanup holds the net_mutex while calling its
registered pernet callbacks, any new net namespace initialization is
blocked until the current net namespace finishes exiting.

After this change, the tcp socket notices the exiting net namespace, and
closes immediately, releasing its dst(s) and their reference to the
loopback interface, which lets the net namespace continue exiting.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=97811
Signed-off-by: Dan Streetman 
Signed-off-by: David S. Miller

net: sched: fix TCF_LAYER_LINK case in tcf_get_base_ptr

2018-01-24T19:52:48+00:00

TCF_LAYER_LINK and TCF_LAYER_NETWORK returned the same pointer as
skb->data points to the network header.
Use skb_mac_header instead.

Signed-off-by: Wolfgang Bumiller 
Signed-off-by: David S. Miller

ipv6: Fix getsockopt() for sockets with default IPV6_AUTOFLOWLABEL

2018-01-24T00:53:24+00:00

Commit 513674b5a2c9 ("net: reevalulate autoflowlabel setting after
sysctl setting") removed the initialisation of
ipv6_pinfo::autoflowlabel and added a second flag to indicate
whether this field or the net namespace default should be used.

The getsockopt() handling for this case was not updated, so it
currently returns 0 for all sockets for which IPV6_AUTOFLOWLABEL is
not explicitly enabled.  Fix it to return the effective value, whether
that has been set at the socket or net namespace level.

Fixes: 513674b5a2c9 ("net: reevalulate autoflowlabel setting after sysctl ...")
Signed-off-by: Ben Hutchings 
Signed-off-by: David S. Miller

net, sched: fix panic when updating miniq {b,q}stats

2018-01-16T20:02:36+00:00

While working on fixing another bug, I ran into the following panic
on arm64 by simply attaching clsact qdisc, adding a filter and running
traffic on ingress to it:

  [...]
  [  178.188591] Unable to handle kernel read from unreadable memory at virtual address 810fb501f000
  [  178.197314] Mem abort info:
  [  178.200121]   ESR = 0x96000004
  [  178.203168]   Exception class = DABT (current EL), IL = 32 bits
  [  178.209095]   SET = 0, FnV = 0
  [  178.212157]   EA = 0, S1PTW = 0
  [  178.215288] Data abort info:
  [  178.218175]   ISV = 0, ISS = 0x00000004
  [  178.222019]   CM = 0, WnR = 0
  [  178.224997] user pgtable: 4k pages, 48-bit VAs, pgd = 0000000023cb3f33
  [  178.231531] [0000810fb501f000] *pgd=0000000000000000
  [  178.236508] Internal error: Oops: 96000004 [#1] SMP
  [...]
  [  178.311855] CPU: 73 PID: 2497 Comm: ping Tainted: G        W        4.15.0-rc7+ #5
  [  178.319413] Hardware name: FOXCONN R2-1221R-A4/C2U4N_MB, BIOS G31FB18A 03/31/2017
  [  178.326887] pstate: 60400005 (nZCv daif +PAN -UAO)
  [  178.331685] pc : __netif_receive_skb_core+0x49c/0xac8
  [  178.336728] lr : __netif_receive_skb+0x28/0x78
  [  178.341161] sp : ffff00002344b750
  [  178.344465] x29: ffff00002344b750 x28: ffff810fbdfd0580
  [  178.349769] x27: 0000000000000000 x26: ffff000009378000
  [...]
  [  178.418715] x1 : 0000000000000054 x0 : 0000000000000000
  [  178.424020] Process ping (pid: 2497, stack limit = 0x000000009f0a3ff4)
  [  178.430537] Call trace:
  [  178.432976]  __netif_receive_skb_core+0x49c/0xac8
  [  178.437670]  __netif_receive_skb+0x28/0x78
  [  178.441757]  process_backlog+0x9c/0x160
  [  178.445584]  net_rx_action+0x2f8/0x3f0
  [...]

Reason is that sch_ingress and sch_clsact are doing mini_qdisc_pair_init()
which sets up miniq pointers to cpu_{b,q}stats from the underlying qdisc.
Problem is that this cannot work since they are actually set up right after
the qdisc ->init() callback in qdisc_create(), so first packet going into
sch_handle_ingress() tries to call mini_qdisc_bstats_cpu_update() and we
therefore panic.

In order to fix this, allocation of {b,q}stats needs to happen before we
call into ->init(). In net-next, there's already such option through commit
d59f5ffa59d8 ("net: sched: a dflt qdisc may be used with per cpu stats").
However, the bug needs to be fixed in net still for 4.15. Thus, include
these bits to reduce any merge churn and reuse the static_flags field to
set TCQ_F_CPUSTATS, and remove the allocation from qdisc_create() since
there is no other user left. Prashant Bhole ran into the same issue but
for net-next, thus adding him below as well as co-author. Same issue was
also reported by Sandipan Das when using bcc.

Fixes: 46209401f8f6 ("net: core: introduce mini_Qdisc and eliminate usage of tp->q for clsact fastpath")
Reference: https://lists.iovisor.org/pipermail/iovisor-dev/2018-January/001190.html
Reported-by: Sandipan Das 
Co-authored-by: Prashant Bhole 
Co-authored-by: John Fastabend 
Signed-off-by: Daniel Borkmann 
Cc: Jiri Pirko 
Signed-off-by: David S. Miller