Commit Graph

44260 Commits

Author SHA1 Message Date
Sowmini Varadhan
1a0e100fb2 RDS: TCP: Force every connection to be initiated by numerically smaller IP address
When 2 RDS peers initiate an RDS-TCP connection simultaneously,
there is a potential for "duelling syns" on either/both sides.
See commit 241b271952 ("RDS-TCP: Reset tcp callbacks if re-using an
outgoing socket in rds_tcp_accept_one()") for a description of this
condition, and the arbitration logic which ensures that the
numerically large IP address in the TCP connection is bound to the
RDS_TCP_PORT ("canonical ordering").

The rds_connection should not be marked as RDS_CONN_UP until the
arbitration logic has converged for the following reason. The sender
may start transmitting RDS datagrams as soon as RDS_CONN_UP is set,
and since the sender removes all datagrams from the rds_connection's
cp_retrans queue based on TCP acks. If the TCP ack was sent from
a tcp socket that got reset as part of duel aribitration (but
before data was delivered to the receivers RDS socket layer),
the sender may end up prematurely freeing the datagram, and
the datagram is no longer reliably deliverable.

This patch remedies that condition by making sure that, upon
receipt of 3WH completion state change notification of TCP_ESTABLISHED
in rds_tcp_state_change, we mark the rds_connection as RDS_CONN_UP
if, and only if, the IP addresses and ports for the connection are
canonically ordered. In all other cases, rds_tcp_state_change will
force an rds_conn_path_drop(), and rds_queue_reconnect() on
both peers will restart the connection to ensure canonical ordering.

A side-effect of enforcing this condition in rds_tcp_state_change()
is that rds_tcp_accept_one_path() can now be refactored for simplicity.
It is also no longer possible to encounter an RDS_CONN_UP connection in
the arbitration logic in rds_tcp_accept_one().

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 13:35:18 -05:00
Sowmini Varadhan
905dd4184e RDS: TCP: Track peer's connection generation number
The RDS transport has to be able to distinguish between
two types of failure events:
(a) when the transport fails (e.g., TCP connection reset)
    but the RDS socket/connection layer on both sides stays
    the same
(b) when the peer's RDS layer itself resets (e.g., due to module
    reload or machine reboot at the peer)
In case (a) both sides must reconnect and continue the RDS messaging
without any message loss or disruption to the message sequence numbers,
and this is achieved by rds_send_path_reset().

In case (b) we should reset all rds_connection state to the
new incarnation of the peer. Examples of state that needs to
be reset are next expected rx sequence number from, or messages to be
retransmitted to, the new incarnation of the peer.

To achieve this, the RDS handshake probe added as part of
commit 5916e2c155 ("RDS: TCP: Enable multipath RDS for TCP")
is enhanced so that sender and receiver of the RDS ping-probe
will add a generation number as part of the RDS_EXTHDR_GEN_NUM
extension header. Each peer stores local and remote generation
numbers as part of each rds_connection. Changes in generation
number will be detected via incoming handshake probe ping
request or response and will allow the receiver to reset rds_connection
state.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 13:35:18 -05:00
Sowmini Varadhan
315ca6d98e RDS: TCP: set RDS_FLAG_RETRANSMITTED in cp_retrans list
As noted in rds_recv_incoming() sequence numbers on data packets
can decreas for the failover case, and the Rx path is equipped
to recover from this, if the RDS_FLAG_RETRANSMITTED is set
on the rds header of an incoming message with a suspect sequence
number.

The RDS_FLAG_RETRANSMITTED is predicated on the RDS_FLAG_RETRANSMITTED
flag in the rds_message, so make sure the flag is set on messages
queued for retransmission.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 13:35:18 -05:00
Eric Dumazet
29c58472ec net_sched: sch_fq: use hash_ptr()
When I wrote sch_fq.c, hash_ptr() on 64bit arches was awful,
and I chose hash_32().

Linus Torvalds and George Spelvin fixed this issue, so we can
use hash_ptr() to get more entropy on 64bit arches with Terabytes
of memory, and avoid the cast games.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-17 13:28:56 -05:00
Xin Long
7fda702f93 sctp: use new rhlist interface on sctp transport rhashtable
Now sctp transport rhashtable uses hash(lport, dport, daddr) as the key
to hash a node to one chain. If in one host thousands of assocs connect
to one server with the same lport and different laddrs (although it's
not a normal case), all the transports would be hashed into the same
chain.

It may cause to keep returning -EBUSY when inserting a new node, as the
chain is too long and sctp inserts a transport node in a loop, which
could even lead to system hangs there.

The new rhlist interface works for this case that there are many nodes
with the same key in one chain. It puts them into a list then makes this
list be as a node of the chain.

This patch is to replace rhashtable_ interface with rhltable_ interface.
Since a chain would not be too long and it would not return -EBUSY with
this fix when inserting a node, the reinsert loop is also removed here.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 23:22:17 -05:00
Eric Dumazet
89c4b442b7 netpoll: more efficient locking
Callers of netpoll_poll_lock() own NAPI_STATE_SCHED

Callers of netpoll_poll_unlock() have BH blocked between
the NAPI_STATE_SCHED being cleared and poll_lock is released.

We can avoid the spinlock which has no contention, and use cmpxchg()
on poll_owner which we need to set anyway.

This removes a possible lockdep violation after the cited commit,
since sk_busy_loop() re-enables BH before calling busy_poll_stop()

Fixes: 217f697436 ("net: busy-poll: allow preemption in sk_busy_loop()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 18:32:02 -05:00
Eric Dumazet
364b605573 net: busy-poll: return busypolling status to drivers
NAPI drivers use napi_complete_done() or napi_complete() when
they drained RX ring and right before re-enabling device interrupts.

In busy polling, we can avoid interrupts being delivered since
we are polling RX ring in a controlled loop.

Drivers can chose to use napi_complete_done() return value
to reduce interrupts overhead while busy polling is active.

This is optional, legacy drivers should work fine even
if not updated.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Adam Belay <abelay@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Cc: Yuval Mintz <Yuval.Mintz@cavium.com>
Cc: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 13:40:58 -05:00
Eric Dumazet
217f697436 net: busy-poll: allow preemption in sk_busy_loop()
After commit 4cd13c21b2 ("softirq: Let ksoftirqd do its job"),
sk_busy_loop() needs a bit of care :
softirqs might be delayed since we do not allow preemption yet.

This patch adds preemptiom points in sk_busy_loop(),
and makes sure no unnecessary cache line dirtying
or atomic operations are done while looping.

A new flag is added into napi->state : NAPI_STATE_IN_BUSY_POLL

This prevents napi_complete_done() from clearing NAPIF_STATE_SCHED,
so that sk_busy_loop() does not have to grab it again.

Similarly, netpoll_poll_lock() is done one time.

This gives about 10 to 20 % improvement in various busy polling
tests, especially when many threads are busy polling in
configurations with large number of NIC queues.

This should allow experimenting with bigger delays without
hurting overall latencies.

Tested:
 On a 40Gb mlx4 NIC, 32 RX/TX queues.

 echo 70 >/proc/sys/net/core/busy_read
 for i in `seq 1 40`; do echo -n $i: ; ./super_netperf $i -H lpaa24 -t UDP_RR -- -N -n; done

    Before:      After:
 1:   90072   92819
 2:  157289  184007
 3:  235772  213504
 4:  344074  357513
 5:  394755  458267
 6:  461151  487819
 7:  549116  625963
 8:  544423  716219
 9:  720460  738446
10:  794686  837612
11:  915998  923960
12:  937507  925107
13: 1019677  971506
14: 1046831 1113650
15: 1114154 1148902
16: 1105221 1179263
17: 1266552 1299585
18: 1258454 1383817
19: 1341453 1312194
20: 1363557 1488487
21: 1387979 1501004
22: 1417552 1601683
23: 1550049 1642002
24: 1568876 1601915
25: 1560239 1683607
26: 1640207 1745211
27: 1706540 1723574
28: 1638518 1722036
29: 1734309 1757447
30: 1782007 1855436
31: 1724806 1888539
32: 1717716 1944297
33: 1778716 1869118
34: 1805738 1983466
35: 1815694 2020758
36: 1893059 2035632
37: 1843406 2034653
38: 1888830 2086580
39: 1972827 2143567
40: 1877729 2181851

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Adam Belay <abelay@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Cc: Yuval Mintz <Yuval.Mintz@cavium.com>
Cc: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 13:40:57 -05:00
David Lebrun
46738b1317 ipv6: sr: add option to control lwtunnel support
This patch adds a new option CONFIG_IPV6_SEG6_LWTUNNEL to enable/disable
support of encapsulation with the lightweight tunnels. When this option
is enabled, CONFIG_LWTUNNEL is automatically selected.

Fix commit 6c8702c60b ("ipv6: sr: add support for SRH encapsulation and injection with lwtunnels")

Without a proper option to control lwtunnel support for SR-IPv6, if
CONFIG_LWTUNNEL=n then the IPv6 initialization fails as a consequence
of seg6_iptunnel_init() failure with EOPNOTSUPP:

NET: Registered protocol family 10
IPv6: Attempt to unregister permanent protocol 6
IPv6: Attempt to unregister permanent protocol 136
IPv6: Attempt to unregister permanent protocol 17
NET: Unregistered protocol family 10

Tested (compiling, booting, and loading ipv6 module when relevant)
with possible combinations of CONFIG_IPV6={y,m,n},
CONFIG_IPV6_SEG6_LWTUNNEL={y,n} and CONFIG_LWTUNNEL={y,n}.

Reported-by: Lorenzo Colitti <lorenzo@google.com>
Suggested-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-16 11:29:46 -05:00
Andrey Vagin
319b0534b9 tcp: allow to enable the repair mode for non-listening sockets
The repair mode is used to get and restore sequence numbers and
data from queues. It used to checkpoint/restore connections.

Currently the repair mode can be enabled for sockets in the established
and closed states, but for other states we have to dump the same socket
properties, so lets allow to enable repair mode for these sockets.

The repair mode reveals nothing more for sockets in other states.

Signed-off-by: Andrei Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-15 22:28:50 -05:00
Florian Westphal
4780566784 dctcp: update cwnd on congestion event
draft-ietf-tcpm-dctcp-02 says:

... when the sender receives an indication of congestion
(ECE), the sender SHOULD update cwnd as follows:

         cwnd = cwnd * (1 - DCTCP.Alpha / 2)

So, lets do this and reduce cwnd more smoothly (and faster), as per
current congestion estimate.

Cc: Lawrence Brakmo <brakmo@fb.com>
Cc: Andrew Shewmaker <agshew@gmail.com>
Cc: Glenn Judd <glenn.judd@morganstanley.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-15 22:01:58 -05:00
Paolo Abeni
c915fe13cb udplite: fix NULL pointer dereference
The commit 850cbaddb5 ("udp: use it's own memory accounting schema")
assumes that the socket proto has memory accounting enabled,
but this is not the case for UDPLITE.
Fix it enabling memory accounting for UDPLITE and performing
fwd allocated memory reclaiming on socket shutdown.
UDP and UDPLITE share now the same memory accounting limits.
Also drop the backlog receive operation, since is no more needed.

Fixes: 850cbaddb5 ("udp: use it's own memory accounting schema")
Reported-by: Andrei Vagin <avagin@gmail.com>
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-15 11:59:38 -05:00
David S. Miller
bb598c1b8c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Several cases of bug fixes in 'net' overlapping other changes in
'net-next-.

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-15 10:54:36 -05:00
Linus Torvalds
e76d21c40b Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking fixes from David Miller:

 1) Fix off by one wrt. indexing when dumping /proc/net/route entries,
    from Alexander Duyck.

 2) Fix lockdep splats in iwlwifi, from Johannes Berg.

 3) Cure panic when inserting certain netfilter rules when NFT_SET_HASH
    is disabled, from Liping Zhang.

 4) Memory leak when nft_expr_clone() fails, also from Liping Zhang.

 5) Disable UFO when path will apply IPSEC tranformations, from Jakub
    Sitnicki.

 6) Don't bogusly double cwnd in dctcp module, from Florian Westphal.

 7) skb_checksum_help() should never actually use the value "0" for the
    resulting checksum, that has a special meaning, use CSUM_MANGLED_0
    instead. From Eric Dumazet.

 8) Per-tx/rx queue statistic strings are wrong in qed driver, fix from
    Yuval MIntz.

 9) Fix SCTP reference counting of associations and transports in
    sctp_diag. From Xin Long.

10) When we hit ip6tunnel_xmit() we could have come from an ipv4 path in
    a previous layer or similar, so explicitly clear the ipv6 control
    block in the skb. From Eli Cooper.

11) Fix bogus sleeping inside of inet_wait_for_connect(), from WANG
    Cong.

12) Correct deivce ID of T6 adapter in cxgb4 driver, from Hariprasad
    Shenai.

13) Fix potential access past the end of the skb page frag array in
    tcp_sendmsg(). From Eric Dumazet.

14) 'skb' can legitimately be NULL in inet{,6}_exact_dif_match(). Fix
    from David Ahern.

15) Don't return an error in tcp_sendmsg() if we wronte any bytes
    successfully, from Eric Dumazet.

16) Extraneous unlocks in netlink_diag_dump(), we removed the locking
    but forgot to purge these unlock calls. From Eric Dumazet.

17) Fix memory leak in error path of __genl_register_family(). We leak
    the attrbuf, from WANG Cong.

18) cgroupstats netlink policy table is mis-sized, from WANG Cong.

19) Several XDP bug fixes in mlx5, from Saeed Mahameed.

20) Fix several device refcount leaks in network drivers, from Johan
    Hovold.

21) icmp6_send() should use skb dst device not skb->dev to determine L3
    routing domain. From David Ahern.

22) ip_vs_genl_family sets maxattr incorrectly, from WANG Cong.

23) We leak new macvlan port in some cases of maclan_common_netlink()
    errors. Fix from Gao Feng.

24) Similar to the icmp6_send() fix, icmp_route_lookup() should
    determine L3 routing domain using skb_dst(skb)->dev not skb->dev.
    Also from David Ahern.

25) Several fixes for route offloading and FIB notification handling in
    mlxsw driver, from Jiri Pirko.

26) Properly cap __skb_flow_dissect()'s return value, from Eric Dumazet.

27) Fix long standing regression in ipv4 redirect handling, wrt.
    validating the new neighbour's reachability. From Stephen Suryaputra
    Lin.

28) If sk_filter() trims the packet excessively, handle it reasonably in
    tcp input instead of exploding. From Eric Dumazet.

29) Fix handling of napi hash state when copying channels in sfc driver,
    from Bert Kenward.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (121 commits)
  mlxsw: spectrum_router: Flush FIB tables during fini
  net: stmmac: Fix lack of link transition for fixed PHYs
  sctp: change sk state only when it has assocs in sctp_shutdown
  bnx2: Wait for in-flight DMA to complete at probe stage
  Revert "bnx2: Reset device during driver initialization"
  ps3_gelic: fix spelling mistake in debug message
  net: ethernet: ixp4xx_eth: fix spelling mistake in debug message
  ibmvnic: Fix size of debugfs name buffer
  ibmvnic: Unmap ibmvnic_statistics structure
  sfc: clear napi_hash state when copying channels
  mlxsw: spectrum_router: Correctly dump neighbour activity
  mlxsw: spectrum: Fix refcount bug on span entries
  bnxt_en: Fix VF virtual link state.
  bnxt_en: Fix ring arithmetic in bnxt_setup_tc().
  Revert "include/uapi/linux/atm_zatm.h: include linux/time.h"
  tcp: take care of truncations done by sk_filter()
  ipv4: use new_gw for redirect neigh lookup
  r8152: Fix error path in open function
  net: bpqether.h: remove if_ether.h guard
  net: __skb_flow_dissect() must cap its return value
  ...
2016-11-14 14:15:53 -08:00
Xin Long
5bf35ddfee sctp: change sk state only when it has assocs in sctp_shutdown
Now when users shutdown a sock with SEND_SHUTDOWN in sctp, even if
this sock has no connection (assoc), sk state would be changed to
SCTP_SS_CLOSING, which is not as we expect.

Besides, after that if users try to listen on this sock, kernel
could even panic when it dereference sctp_sk(sk)->bind_hash in
sctp_inet_listen, as bind_hash is null when sock has no assoc.

This patch is to move sk state change after checking sk assocs
is not empty, and also merge these two if() conditions and reduce
indent level.

Fixes: d46e416c11 ("sctp: sctp should change socket state when shutdown is received")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-14 16:22:33 -05:00
WANG Cong
d9dc8b0f8b net: fix sleeping for sk_wait_event()
Similar to commit 14135f30e3 ("inet: fix sleeping inside inet_wait_for_connect()"),
sk_wait_event() needs to fix too, because release_sock() is blocking,
it changes the process state back to running after sleep, which breaks
the previous prepare_to_wait().

Switch to the new wait API.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-14 13:17:21 -05:00
David S. Miller
7d384846b9 Merge 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 a second batch of Netfilter updates for
your net-next tree. This includes a rework of the core hook
infrastructure that improves Netfilter performance by ~15% according to
synthetic benchmarks. Then, a large batch with ipset updates, including
a new hash:ipmac set type, via Jozsef Kadlecsik. This also includes a
couple of assorted updates.

Regarding the core hook infrastructure rework to improve performance,
using this simple drop-all packets ruleset from ingress:

        nft add table netdev x
        nft add chain netdev x y { type filter hook ingress device eth0 priority 0\; }
        nft add rule netdev x y drop

And generating traffic through Jesper Brouer's
samples/pktgen/pktgen_bench_xmit_mode_netif_receive.sh script using -i
option. perf report shows nf_tables calls in its top 10:

    17.30%  kpktgend_0   [nf_tables]            [k] nft_do_chain
    15.75%  kpktgend_0   [kernel.vmlinux]       [k] __netif_receive_skb_core
    10.39%  kpktgend_0   [nf_tables_netdev]     [k] nft_do_chain_netdev

I'm measuring here an improvement of ~15% in performance with this
patchset, so we got +2.5Mpps more. I have used my old laptop Intel(R)
Core(TM) i5-3320M CPU @ 2.60GHz 4-cores.

This rework contains more specifically, in strict order, these patches:

1) Remove compile-time debugging from core.

2) Remove obsolete comments that predate the rcu era. These days it is
   well known that a Netfilter hook always runs under rcu_read_lock().

3) Remove threshold handling, this is only used by br_netfilter too.
   We already have specific code to handle this from br_netfilter,
   so remove this code from the core path.

4) Deprecate NF_STOP, as this is only used by br_netfilter.

5) Place nf_state_hook pointer into xt_action_param structure, so
   this structure fits into one single cacheline according to pahole.
   This also implicit affects nftables since it also relies on the
   xt_action_param structure.

6) Move state->hook_entries into nf_queue entry. The hook_entries
   pointer is only required by nf_queue(), so we can store this in the
   queue entry instead.

7) use switch() statement to handle verdict cases.

8) Remove hook_entries field from nf_hook_state structure, this is only
   required by nf_queue, so store it in nf_queue_entry structure.

9) Merge nf_iterate() into nf_hook_slow() that results in a much more
   simple and readable function.

10) Handle NF_REPEAT away from the core, so far the only client is
    nf_conntrack_in() and we can restart the packet processing using a
    simple goto to jump back there when the TCP requires it.
    This update required a second pass to fix fallout, fix from
    Arnd Bergmann.

11) Set random seed from nft_hash when no seed is specified from
    userspace.

12) Simplify nf_tables expression registration, in a much smarter way
    to save lots of boiler plate code, by Liping Zhang.

13) Simplify layer 4 protocol conntrack tracker registration, from
    Davide Caratti.

14) Missing CONFIG_NF_SOCKET_IPV4 dependency for udp4_lib_lookup, due
    to recent generalization of the socket infrastructure, from Arnd
    Bergmann.

15) Then, the ipset batch from Jozsef, he describes it as it follows:

* Cleanup: Remove extra whitespaces in ip_set.h
* Cleanup: Mark some of the helpers arguments as const in ip_set.h
* Cleanup: Group counter helper functions together in ip_set.h
* struct ip_set_skbinfo is introduced instead of open coded fields
  in skbinfo get/init helper funcions.
* Use kmalloc() in comment extension helper instead of kzalloc()
  because it is unnecessary to zero out the area just before
  explicit initialization.
* Cleanup: Split extensions into separate files.
* Cleanup: Separate memsize calculation code into dedicated function.
* Cleanup: group ip_set_put_extensions() and ip_set_get_extensions()
  together.
* Add element count to hash headers by Eric B Munson.
* Add element count to all set types header for uniform output
  across all set types.
* Count non-static extension memory into memsize calculation for
  userspace.
* Cleanup: Remove redundant mtype_expire() arguments, because
  they can be get from other parameters.
* Cleanup: Simplify mtype_expire() for hash types by removing
  one level of intendation.
* Make NLEN compile time constant for hash types.
* Make sure element data size is a multiple of u32 for the hash set
  types.
* Optimize hash creation routine, exit as early as possible.
* Make struct htype per ipset family so nets array becomes fixed size
  and thus simplifies the struct htype allocation.
* Collapse same condition body into a single one.
* Fix reported memory size for hash:* types, base hash bucket structure
  was not taken into account.
* hash:ipmac type support added to ipset by Tomasz Chilinski.
* Use setup_timer() and mod_timer() instead of init_timer()
  by Muhammad Falak R Wani, individually for the set type families.

16) Remove useless connlabel field in struct netns_ct, patch from
    Florian Westphal.

17) xt_find_table_lock() doesn't return ERR_PTR() anymore, so simplify
    {ip,ip6,arp}tables code that uses this.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 22:41:25 -05:00
Julia Lawall
eb1a6bdc28 netfilter: x_tables: simplify IS_ERR_OR_NULL to NULL test
Since commit 7926dbfa4b ("netfilter: don't use
mutex_lock_interruptible()"), the function xt_find_table_lock can only
return NULL on an error.  Simplify the call sites and update the
comment before the function.

The semantic patch that change the code is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression t,e;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
- ! IS_ERR_OR_NULL(t)
+ t

@@
expression t,e;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
- IS_ERR_OR_NULL(t)
+ !t

@@
expression t,e,e1;
@@

t = \(xt_find_table_lock(...)\|
      try_then_request_module(xt_find_table_lock(...),...)\)
... when != t=e
?- t ? PTR_ERR(t) : e1
+ e1
... when any

// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-11-13 22:26:13 +01:00
Eric Dumazet
ac6e780070 tcp: take care of truncations done by sk_filter()
With syzkaller help, Marco Grassi found a bug in TCP stack,
crashing in tcp_collapse()

Root cause is that sk_filter() can truncate the incoming skb,
but TCP stack was not really expecting this to happen.
It probably was expecting a simple DROP or ACCEPT behavior.

We first need to make sure no part of TCP header could be removed.
Then we need to adjust TCP_SKB_CB(skb)->end_seq

Many thanks to syzkaller team and Marco for giving us a reproducer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Marco Grassi <marco.gra@gmail.com>
Reported-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 12:30:02 -05:00
Stephen Suryaputra Lin
969447f226 ipv4: use new_gw for redirect neigh lookup
In v2.6, ip_rt_redirect() calls arp_bind_neighbour() which returns 0
and then the state of the neigh for the new_gw is checked. If the state
isn't valid then the redirected route is deleted. This behavior is
maintained up to v3.5.7 by check_peer_redirect() because rt->rt_gateway
is assigned to peer->redirect_learned.a4 before calling
ipv4_neigh_lookup().

After commit 5943634fc5 ("ipv4: Maintain redirect and PMTU info in
struct rtable again."), ipv4_neigh_lookup() is performed without the
rt_gateway assigned to the new_gw. In the case when rt_gateway (old_gw)
isn't zero, the function uses it as the key. The neigh is most likely
valid since the old_gw is the one that sends the ICMP redirect message.
Then the new_gw is assigned to fib_nh_exception. The problem is: the
new_gw ARP may never gets resolved and the traffic is blackholed.

So, use the new_gw for neigh lookup.

Changes from v1:
 - use __ipv4_neigh_lookup instead (per Eric Dumazet).

Fixes: 5943634fc5 ("ipv4: Maintain redirect and PMTU info in struct rtable again.")
Signed-off-by: Stephen Suryaputra Lin <ssurya@ieee.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 12:24:44 -05:00
Jiri Benc
217ac77a3c openvswitch: allow L3 netdev ports
Allow ARPHRD_NONE interfaces to be added to ovs bridge.

Based on previous versions by Lorand Jakab and Simon Horman.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
91820da6ae openvswitch: add Ethernet push and pop actions
It's not allowed to push Ethernet header in front of another Ethernet
header.

It's not allowed to pop Ethernet header if there's a vlan tag. This
preserves the invariant that L3 packet never has a vlan tag.

Based on previous versions by Lorand Jakab and Simon Horman.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
0a6410fbde openvswitch: netlink: support L3 packets
Extend the ovs flow netlink protocol to support L3 packets. Packets without
OVS_KEY_ATTR_ETHERNET attribute specify L3 packets; for those, the
OVS_KEY_ATTR_ETHERTYPE attribute is mandatory.

Push/pop vlan actions are only supported for Ethernet packets.

Based on previous versions by Lorand Jakab and Simon Horman.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
5108bbaddc openvswitch: add processing of L3 packets
Support receiving, extracting flow key and sending of L3 packets (packets
without an Ethernet header).

Note that even after this patch, non-Ethernet interfaces are still not
allowed to be added to bridges. Similarly, netlink interface for sending and
receiving L3 packets to/from user space is not in place yet.

Based on previous versions by Lorand Jakab and Simon Horman.

Signed-off-by: Lorand Jakab <lojakab@cisco.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
1560a074df openvswitch: support MPLS push and pop for L3 packets
Update Ethernet header only if there is one.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
e2d9d8358c openvswitch: pass mac_proto to ovs_vport_send
We'll need it to alter packets sent to ARPHRD_NONE interfaces.

Change do_output() to use the actual L2 header size of the packet when
deciding on the minimum cutlen. The assumption here is that what matters is
not the output interface hard_header_len but rather the L2 header of the
particular packet. For example, ARPHRD_NONE tunnels that encapsulate
Ethernet should get at least the Ethernet header.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
329f45bc4f openvswitch: add mac_proto field to the flow key
Use a hole in the structure. We support only Ethernet so far and will add
a support for L2-less packets shortly. We could use a bool to indicate
whether the Ethernet header is present or not but the approach with the
mac_proto field is more generic and occupies the same number of bytes in the
struct, while allowing later extensibility. It also makes the code in the
next patches more self explaining.

It would be nice to use ARPHRD_ constants but those are u16 which would be
waste. Thus define our own constants.

Another upside of this is that we can overload this new field to also denote
whether the flow key is valid. This has the advantage that on
refragmentation, we don't have to reparse the packet but can rely on the
stored eth.type. This is especially important for the next patches in this
series - instead of adding another branch for L2-less packets before calling
ovs_fragment, we can just remove all those branches completely.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Jiri Benc
738314a084 openvswitch: use hard_header_len instead of hardcoded ETH_HLEN
On tx, use hard_header_len while deciding whether to refragment or drop the
packet. That way, all combinations are calculated correctly:

* L2 packet going to L2 interface (the L2 header len is subtracted),
* L2 packet going to L3 interface (the L2 header is included in the packet
  lenght),
* L3 packet going to L3 interface.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-13 00:51:02 -05:00
Eric Dumazet
34fad54c25 net: __skb_flow_dissect() must cap its return value
After Tom patch, thoff field could point past the end of the buffer,
this could fool some callers.

If an skb was provided, skb->len should be the upper limit.
If not, hlen is supposed to be the upper limit.

Fixes: a6e544b0a8 ("flow_dissector: Jump to exit code in __skb_flow_dissect")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Yibin Yang <yibyang@cisco.com
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-12 23:41:53 -05:00
Martin KaFai Lau
4e3264d21b bpf: Fix bpf_redirect to an ipip/ip6tnl dev
If the bpf program calls bpf_redirect(dev, 0) and dev is
an ipip/ip6tnl, it currently includes the mac header.
e.g. If dev is ipip, the end result is IP-EthHdr-IP instead
of IP-IP.

The fix is to pull the mac header.  At ingress, skb_postpull_rcsum()
is not needed because the ethhdr should have been pulled once already
and then got pushed back just before calling the bpf_prog.
At egress, this patch calls skb_postpull_rcsum().

If bpf_redirect(dev, BPF_F_INGRESS) is called,
it also fails now because it calls dev_forward_skb() which
eventually calls eth_type_trans(skb, dev).  The eth_type_trans()
will set skb->type = PACKET_OTHERHOST because the mac address
does not match the redirecting dev->dev_addr.  The PACKET_OTHERHOST
will eventually cause the ip_rcv() errors out.  To fix this,
____dev_forward_skb() is added.

Joint work with Daniel Borkmann.

Fixes: cfc7381b30 ("ip_tunnel: add collect_md mode to IPIP tunnel")
Fixes: 8d79266bc4 ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-12 23:38:07 -05:00
Linus Torvalds
ef091b3cef Ceph's ->read_iter() implementation is incompatible with the new
generic_file_splice_read() code that went into -rc1.  Switch to the
 less efficient default_file_splice_read() for now; the proper fix is
 being held for 4.10.
 
 We also have a fix for a 4.8 regression and a trival libceph fixup.
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Merge tag 'ceph-for-4.9-rc5' of git://github.com/ceph/ceph-client

Pull Ceph fixes from Ilya Dryomov:
 "Ceph's ->read_iter() implementation is incompatible with the new
  generic_file_splice_read() code that went into -rc1.  Switch to the
  less efficient default_file_splice_read() for now; the proper fix is
  being held for 4.10.

  We also have a fix for a 4.8 regression and a trival libceph fixup"

* tag 'ceph-for-4.9-rc5' of git://github.com/ceph/ceph-client:
  libceph: initialize last_linger_id with a large integer
  libceph: fix legacy layout decode with pool 0
  ceph: use default file splice read callback
2016-11-11 09:17:10 -08:00
Linus Torvalds
ef5beed998 NFS client bugfixes for Linux 4.9
Bugfixes:
 - Trim extra slashes in v4 nfs_paths to fix tools that use this
 - Fix a -Wmaybe-uninitialized warnings
 - Fix suspicious RCU usages
 - Fix Oops when mounting multiple servers at once
 - Suppress a false-positive pNFS error
 - Fix a DMAR failure in NFS over RDMA
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Merge tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client bugfixes from Anna Schumaker:
 "Most of these fix regressions in 4.9, and none are going to stable
  this time around.

  Bugfixes:
   - Trim extra slashes in v4 nfs_paths to fix tools that use this
   - Fix a -Wmaybe-uninitialized warnings
   - Fix suspicious RCU usages
   - Fix Oops when mounting multiple servers at once
   - Suppress a false-positive pNFS error
   - Fix a DMAR failure in NFS over RDMA"

* tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
  fs/nfs: Fix used uninitialized warn in nfs4_slot_seqid_in_use()
  NFS: Don't print a pNFS error if we aren't using pNFS
  NFS: Ignore connections that have cl_rpcclient uninitialized
  SUNRPC: Fix suspicious RCU usage
  NFSv4.1: work around -Wmaybe-uninitialized warning
  NFS: Trim extra slash in v4 nfs_path
2016-11-11 09:15:30 -08:00
Ilya Dryomov
264048afab libceph: initialize last_linger_id with a large integer
osdc->last_linger_id is a counter for lreq->linger_id, which is used
for watch cookies.  Starting with a large integer should ease the task
of telling apart kernel and userspace clients.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-11-10 20:13:08 +01:00
Yan, Zheng
3890dce1d3 libceph: fix legacy layout decode with pool 0
If your data pool was pool 0, ceph_file_layout_from_legacy()
transform that to -1 unconditionally, which broke upgrades.
We only want do that for a fully zeroed ceph_file_layout,
so that it still maps to a file_layout_t.  If any fields
are set, though, we trust the fl_pgpool to be a valid pool.

Fixes: 7627151ea3 ("libceph: define new ceph_file_layout structure")
Link: http://tracker.ceph.com/issues/17825
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2016-11-10 20:13:08 +01:00
Lance Richardson
0ace81ec71 ipv4: update comment to document GSO fragmentation cases.
This is a follow-up to commit 9ee6c5dc81 ("ipv4: allow local
fragmentation in ip_finish_output_gso()"), updating the comment
documenting cases in which fragmentation is needed for egress
GSO packets.

Suggested-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-10 12:01:54 -05:00
Chuck Lever
62bdf94a20 xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
When a LOCALINV WR is flushed, the frmr is marked STALE, then
frwr_op_unmap_sync DMA-unmaps the frmr's SGL. These STALE frmrs
are then recovered when frwr_op_map hunts for an INVALID frmr to
use.

All other cases that need frmr recovery leave that SGL DMA-mapped.
The FRMR recovery path unconditionally DMA-unmaps the frmr's SGL.

To avoid DMA unmapping the SGL twice for flushed LOCAL_INV WRs,
alter the recovery logic (rather than the hot frwr_op_unmap_sync
path) to distinguish among these cases. This solution also takes
care of the case where multiple LOCAL_INV WRs are issued for the
same rpcrdma_req, some complete successfully, but some are flushed.

Reported-by: Vasco Steinmetz <linux@kyberraum.net>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Vasco Steinmetz <linux@kyberraum.net>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2016-11-10 11:04:54 -05:00
kbuild test robot
737d387b75 netfilter: ipset: hash: fix boolreturn.cocci warnings
net/netfilter/ipset/ip_set_hash_ipmac.c:70:8-9: WARNING: return of 0/1 in function 'hash_ipmac4_data_list' with return type bool
net/netfilter/ipset/ip_set_hash_ipmac.c:178:8-9: WARNING: return of 0/1 in function 'hash_ipmac6_data_list' with return type bool

 Return statements in functions returning bool should use
 true/false instead of 1/0.
Generated by: scripts/coccinelle/misc/boolreturn.cocci

CC: Tomasz Chilinski <tomasz.chilinski@chilan.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:50 +01:00
Jozsef Kadlecsik
fcb58a0332 netfilter: ipset: use setup_timer() and mod_timer().
Use setup_timer() and instead of init_timer(), being the preferred way
of setting up a timer.

Also, quoting the mod_timer() function comment:
-> mod_timer() is a more efficient way to update the expire field of an
   active timer (if the timer is inactive it will be activated).

Use setup_timer() and mod_timer() to setup and arm a timer, making the
code compact and easier to read.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:49 +01:00
Tomasz Chilinski
c0db95c7bc netfilter: ipset: hash:ipmac type support added to ipset
Introduce the hash:ipmac type.

Signed-off-by: Tomasz Chili??ski <tomasz.chilinski@chilan.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:49 +01:00
Jozsef Kadlecsik
a71bdbfa99 netfilter: ipset: Fix reported memory size for hash:* types
The calculation of the full allocated memory did not take
into account the size of the base hash bucket structure at some
places.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:48 +01:00
Jozsef Kadlecsik
9be37d2acd netfilter: ipset: Collapse same condition body to a single one
The set full case (with net_ratelimit()-ed pr_warn()) is already
handled, simply jump there.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:48 +01:00
Jozsef Kadlecsik
21956ab290 netfilter: ipset: Make struct htype per ipset family
Before this patch struct htype created at the first source
of ip_set_hash_gen.h and it is common for both IPv4 and IPv6
set variants.

Make struct htype per ipset family and use NLEN to make
nets array fixed size to simplify struct htype allocation.

Ported from a patch proposed by Sergey Popovich <popovich_sergei@mail.ua>.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:48 +01:00
Jozsef Kadlecsik
961509ac18 netfilter: ipset: Optimize hash creation routine
Exit as easly as possible on error and use RCU_INIT_POINTER()
as set is not seen at creation time.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:47 +01:00
Jozsef Kadlecsik
5a902e6d4b netfilter: ipset: Make sure element data size is a multiple of u32
Data for hashing required to be array of u32. Make sure that
element data always multiple of u32.

Ported from a patch proposed by Sergey Popovich <popovich_sergei@mail.ua>.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:47 +01:00
Jozsef Kadlecsik
cee8b97b6c netfilter: ipset: Make NLEN compile time constant for hash types
Hash types define HOST_MASK before inclusion of ip_set_hash_gen.h
and the only place where NLEN needed to be calculated at runtime
is *_create() method.

Ported from a patch proposed by Sergey Popovich <popovich_sergei@mail.ua>.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:46 +01:00
Jozsef Kadlecsik
509debc975 netfilter: ipset: Simplify mtype_expire() for hash types
Remove one leve of intendation by using continue while
iterating over elements in bucket.

Ported from a patch proposed by Sergey Popovich <popovich_sergei@mail.ua>.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:46 +01:00
Jozsef Kadlecsik
5fdb5f6938 netfilter: ipset: Remove redundant mtype_expire() arguments
Remove redundant parameters nets_length and dsize, because
they can be get from other parameters.

Ported from a patch proposed by Sergey Popovich <popovich_sergei@mail.ua>.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:46 +01:00
Jozsef Kadlecsik
9e41f26a50 netfilter: ipset: Count non-static extension memory for userspace
Non-static (i.e. comment) extension was not counted into the memory
size. A new internal counter is introduced for this. In the case of
the hash types the sizes of the arrays are counted there as well so
that we can avoid to scan the whole set when just the header data
is requested.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:45 +01:00
Jozsef Kadlecsik
702b71e7c6 netfilter: ipset: Add element count to all set types header
It is better to list the set elements for all set types, thus the
header information is uniform. Element counts are therefore added
to the bitmap and list types.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:45 +01:00
Eric B Munson
a54dad51a8 netfilter: ipset: Add element count to hash headers
It would be useful for userspace to query the size of an ipset hash,
however, this data is not exposed to userspace outside of counting the
number of member entries.  This patch uses the attribute
IPSET_ATTR_ELEMENTS to indicate the size in the the header that is
exported to userspace.  This field is then printed by the userspace
tool for hashes.

Signed-off-by: Eric B Munson <emunson@akamai.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Josh Hunt <johunt@akamai.com>
Cc: netfilter-devel@vger.kernel.org
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
2016-11-10 13:28:44 +01:00