- 04 5月, 2016 1 次提交
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由 Jon Paul Maloy 提交于
In the refactoring commit d570d864 ("tipc: enqueue arrived buffers in socket in separate function") we did by accident replace the test if (sk->sk_backlog.len == 0) atomic_set(&tsk->dupl_rcvcnt, 0); with if (sk->sk_backlog.len) atomic_set(&tsk->dupl_rcvcnt, 0); This effectively disables the compensation we have for the double receive buffer accounting that occurs temporarily when buffers are moved from the backlog to the socket receive queue. Until now, this has gone unnoticed because of the large receive buffer limits we are applying, but becomes indispensable when we reduce this buffer limit later in this series. We now fix this by inverting the mentioned condition. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 02 5月, 2016 1 次提交
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由 Jon Paul Maloy 提交于
When we are displaying statistics for the first link established between two peers, it will always be presented as STANDBY although it in reality is ACTIVE. This happens because we forget to set the 'active' flag in the link instance at the moment it is established. Although this is a bug, it only has impact on the presentation view of the link, not on its actual functionality. Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 29 4月, 2016 1 次提交
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由 Dan Carpenter 提交于
This is never called with a NULL "buf" and anyway, we dereference 's' on the lines before so it would Oops before we reach the check. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 25 4月, 2016 1 次提交
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由 Parthasarathy Bhuvaragan 提交于
Commit 42b18f60 ("tipc: refactor function tipc_link_timeout()"), introduced a bug which prevents sending of probe messages during link synchronization phase. This leads to hanging links, if the bearer is disabled/enabled after links are up. In this commit, we send the probe messages correctly. Fixes: 42b18f60 ("tipc: refactor function tipc_link_timeout()") Acked-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 16 4月, 2016 5 次提交
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由 Jon Paul Maloy 提交于
According to the link FSM, a received traffic packet can take a link from state ESTABLISHING to ESTABLISHED, but the link can still not be fully set up in one atomic operation. This means that even if the the very first packet on the link is a traffic packet with sequence number 1 (one), it has to be dropped and retransmitted. This can be avoided if we let the mentioned packet be preceded by a LINK_PROTOCOL/STATE message, which takes up the endpoint before the arrival of the traffic. We add this small feature in this commit. This is a fully compatible change. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
In some link establishment scenarios we see that packet #2 may be sent out before packet #1, forcing the receiver to demand retransmission of the missing packet. This is harmless, but may cause confusion among people tracing the packet flow. Since this is extremely easy to fix, we do so by adding en extra send call to the bearer immediately after the link has come up. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
The function tipc_link_timeout() is unnecessary complex, and can easily be made more readable. We do that with this commit. The only functional change is that we remove a redundant test for whether the broadcast link is up or not. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
When a link is down, it will continuously try to re-establish contact with the peer by sending out a RESET or an ACTIVATE message at each timeout interval. The default value for this interval is currently 375 ms. This is wasteful, and may become a problem in very large clusters with dozens or hundreds of nodes being down simultaneously. We now introduce a simple backoff algorithm for these cases. The first five messages are sent at default rate; thereafter a message is sent only each 16th timer interval. This will cover the vast majority of link recycling cases, since the endpoint starting last will transmit at the higher speed, and the link should normally be established well be before the rate needs to be reduced. The only case where we will see a degradation of link re-establishment times is when the endpoints remain intact, and a glitch in the transmission media is causing the link reset. We will then experience a worst-case re-establishing time of 6 seconds, something we deem acceptable. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
When a link endpoint is going down locally, e.g., because its interface is being stopped, it will spontaneously send out a RESET message to its peer, informing it about this fact. This saves the peer from detecting the failure via probing, and hence gives both speedier and less resource consuming failure detection on the peer side. According to the link FSM, a receiver of a RESET message, ignoring the reason for it, must now consider the sender ready to come back up, and starts periodically sending out ACTIVATE messages to the peer in order to re-establish the link. Also, according to the FSM, the receiver of an ACTIVATE message can now go directly to state ESTABLISHED and start sending regular traffic packets. This is a well-proven and robust FSM. However, in the case of a reboot, there is a small possibilty that link endpoint on the rebooted node may have been re-created with a new bearer identity between the moment it sent its (pre-boot) RESET and the moment it receives the ACTIVATE from the peer. The new bearer identity cannot be known by the peer according to this scenario, since traffic headers don't convey such information. This is a problem, because both endpoints need to know the correct value of the peer's bearer id at any moment in time in order to be able to produce correct link events for their users. The only way to guarantee this is to enforce a full setup message exchange (RESET + ACTIVATE) even after the reboot, since those messages carry the bearer idientity in their header. In this commit we do this by introducing and setting a "stopping" bit in the header of the spontaneously generated RESET messages, informing the peer that the sender will not be immediately ready to re-establish the link. A receiver seeing this bit must act as if this were a locally detected connectivity failure, and hence has to go through a full two- way setup message exchange before any link can be re-established. Although never reported, this problem seems to have always been around. This protocol addition is fully backwards compatible. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 15 4月, 2016 1 次提交
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由 Parthasarathy Bhuvaragan 提交于
Until now, the requests sent to topology server are queued to a workqueue by the generic server framework. These messages are processed by worker threads and trigger the registered callbacks. To reduce latency on uniprocessor systems, explicit rescheduling is performed using cond_resched() after MAX_RECV_MSG_COUNT(25) messages. This implementation on SMP systems leads to an subscriber refcnt error as described below: When a worker thread yields by calling cond_resched() in a SMP system, a new worker is created on another CPU to process the pending workitem. Sometimes the sleeping thread wakes up before the new thread finishes execution. This breaks the assumption on ordering and being single threaded. The fault is more frequent when MAX_RECV_MSG_COUNT is lowered. If the first thread was processing subscription create and the second thread processing close(), the close request will free the subscriber and the create request oops as follows: [31.224137] WARNING: CPU: 2 PID: 266 at include/linux/kref.h:46 tipc_subscrb_rcv_cb+0x317/0x380 [tipc] [31.228143] CPU: 2 PID: 266 Comm: kworker/u8:1 Not tainted 4.5.0+ #97 [31.228377] Workqueue: tipc_rcv tipc_recv_work [tipc] [...] [31.228377] Call Trace: [31.228377] [<ffffffff812fbb6b>] dump_stack+0x4d/0x72 [31.228377] [<ffffffff8105a311>] __warn+0xd1/0xf0 [31.228377] [<ffffffff8105a3fd>] warn_slowpath_null+0x1d/0x20 [31.228377] [<ffffffffa0098067>] tipc_subscrb_rcv_cb+0x317/0x380 [tipc] [31.228377] [<ffffffffa00a4984>] tipc_receive_from_sock+0xd4/0x130 [tipc] [31.228377] [<ffffffffa00a439b>] tipc_recv_work+0x2b/0x50 [tipc] [31.228377] [<ffffffff81071925>] process_one_work+0x145/0x3d0 [31.246554] ---[ end trace c3882c9baa05a4fd ]--- [31.248327] BUG: spinlock bad magic on CPU#2, kworker/u8:1/266 [31.249119] BUG: unable to handle kernel NULL pointer dereference at 0000000000000428 [31.249323] IP: [<ffffffff81099d0c>] spin_dump+0x5c/0xe0 [31.249323] PGD 0 [31.249323] Oops: 0000 [#1] SMP In this commit, we - rename tipc_conn_shutdown() to tipc_conn_release(). - move connection release callback execution from tipc_close_conn() to a new function tipc_sock_release(), which is executed before we free the connection. Thus we release the subscriber during connection release procedure rather than connection shutdown procedure. Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 14 4月, 2016 1 次提交
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由 Jon Paul Maloy 提交于
We remove a couple of leftover fields in struct tipc_bearer. Those were used by the old broadcast implementation, and are not needed any longer. There is no functional changes in this commit. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 12 4月, 2016 2 次提交
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由 Erik Hugne 提交于
If a peer node becomes unavailable, in addition to removing the nametable entries from this node we also need to purge all deferred updates associated with this node. Signed-off-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Erik Hugne 提交于
Nametable updates received from the network that cannot be applied immediately are placed on a defer queue. This queue is global to the TIPC module, which might cause problems when using TIPC in containers. To prevent nametable updates from escaping into the wrong namespace, we make the queue pernet instead. Signed-off-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 08 4月, 2016 2 次提交
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由 Jon Paul Maloy 提交于
Resetting a bearer/interface, with the consequence of resetting all its pertaining links, is not an atomic action. This becomes particularly evident in very large clusters, where a lot of traffic may happen on the remaining links while we are busy shutting them down. In extreme cases, we may even see links being re-created and re-established before we are finished with the job. To solve this, we now introduce a solution where we temporarily detach the bearer from the interface when the bearer is reset. This inhibits all packet reception, while sending still is possible. For the latter, we use the fact that the device's user pointer now is zero to filter out which packets can be sent during this situation; i.e., outgoing RESET messages only. This filtering serves to speed up the neighbors' detection of the loss event, and saves us from unnecessary probing. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
When enabling a bearer we create a 'neigbor discoverer' instance by calling the function tipc_disc_create() before the bearer is actually registered in the list of enabled bearers. Because of this, the very first discovery broadcast message, created by the mentioned function, is lost, since it cannot find any valid bearer to use. Furthermore, the used send function, tipc_bearer_xmit_skb() does not free the given buffer when it cannot find a bearer, resulting in the leak of exactly one send buffer each time a bearer is enabled. This commit fixes this problem by introducing two changes: 1) Instead of attemting to send the discovery message directly, we let tipc_disc_create() return the discovery buffer to the calling function, tipc_enable_bearer(), so that the latter can send it when the enabling sequence is finished. 2) In tipc_bearer_xmit_skb(), as well as in the two other transmit functions at the bearer layer, we now free the indicated buffer or buffer chain when a valid bearer cannot be found. Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 15 3月, 2016 1 次提交
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由 Richard Alpe 提交于
Expand headroom further in order to be able to fit the larger IPv6 header. Prior to this patch this caused a skb under panic for certain tipc packets when using IPv6 UDP bearer(s). Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 12 3月, 2016 1 次提交
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由 Daniel Borkmann 提交于
This patch extends udp_tunnel6_xmit_skb() to pass in the IPv6 flow label from call sites. Currently, there's no such option and it's always set to zero when writing ip6_flow_hdr(). Add a label member to ip_tunnel_key, so that flow-based tunnels via collect metadata frontends can make use of it. vxlan and geneve will be converted to add flow label support separately. Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 08 3月, 2016 1 次提交
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由 Richard Alpe 提交于
Make the c files less cluttered and enable netlink attributes to be shared between files. Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Acked-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 07 3月, 2016 6 次提交
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由 Jon Paul Maloy 提交于
Until now, we have kept a pre-allocated protocol message header aggregated into struct tipc_link. Apart from adding unnecessary footprint to the link instances, this requires extra code both to initialize and re-initialize it. We now remove this sub-optimization. This change also makes it possible to clean up the function tipc_build_proto_msg() and remove a couple of small functions that were accessing the mentioned header. In particular, we can replace all occurrences of the local function call link_own_addr(link) with the generic tipc_own_addr(net). Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
commit 4d5cfcba ('tipc: fix connection abort during subscription cancel'), removes the check for a valid subscription before calling tipc_nametbl_subscribe(). This will lead to a nullptr exception when we process a subscription cancel request. For a cancel request, a null subscription is passed to tipc_nametbl_subscribe() resulting in exception. In this commit, we call tipc_nametbl_subscribe() only for a valid subscription. Fixes: 4d5cfcba ('tipc: fix connection abort during subscription cancel') Reported-by: NAnders Widell <anders.widell@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Richard Alpe 提交于
Make sure the user has provided a scope for multicast and link local addresses used locally by a UDP bearer. Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Reviewed-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Richard Alpe 提交于
The netlink policy for TIPC_NLA_UDP_LOCAL and TIPC_NLA_UDP_REMOTE is of type binary with a defined length. This causes the policy framework to threat the defined length as maximum length. There is however no protection against a user sending a smaller amount of data. Prior to this patch this wasn't handled which could result in a partially incomplete sockaddr_storage struct containing uninitialized data. In this patch we use nla_memcpy() when copying the user data. This ensures a potential gap at the end is cleared out properly. This was found by Julia with Coccinelle tool. Reported-by: NDaniel Borkmann <daniel@iogearbox.net> Reported-by: NJulia Lawall <julia.lawall@lip6.fr> Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Reviewed-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Richard Alpe 提交于
Make sure we have a link before checking if it has been reset or not. Prior to this patch tipc_link_is_reset() could be called with a non existing link, resulting in a null pointer dereference. Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Reviewed-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Richard Alpe 提交于
Prior to this patch enabling a IPv4 UDP bearer caused a null pointer dereference in iptunnel_xmit_stats(), when it tried to dereference the net device from the skb. To resolve this we now point the skb device to the net device resolved from the routing table. Fixes: 039f5062 (ip_tunnel: Move stats update to iptunnel_xmit()) Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Reviewed-by: NErik Hugne <erik.hugne@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 04 3月, 2016 1 次提交
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由 Parthasarathy Bhuvaragan 提交于
reverts commit 94153e36 ("tipc: use existing sk_write_queue for outgoing packet chain") In Commit 94153e36, we assume that we fill & empty the socket's sk_write_queue within the same lock_sock() session. This is not true if the link is congested. During congestion, the socket lock is released while we wait for the congestion to cease. This implementation causes a nullptr exception, if the user space program has several threads accessing the same socket descriptor. Consider two threads of the same program performing the following: Thread1 Thread2 -------------------- ---------------------- Enter tipc_sendmsg() Enter tipc_sendmsg() lock_sock() lock_sock() Enter tipc_link_xmit(), ret=ELINKCONG spin on socket lock.. sk_wait_event() : release_sock() grab socket lock : Enter tipc_link_xmit(), ret=0 : release_sock() Wakeup after congestion lock_sock() skb = skb_peek(pktchain); !! TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong; In this case, the second thread transmits the buffers belonging to both thread1 and thread2 successfully. When the first thread wakeup after the congestion it assumes that the pktchain is intact and operates on the skb's in it, which leads to the following exception: [2102.439969] BUG: unable to handle kernel NULL pointer dereference at 00000000000000d0 [2102.440074] IP: [<ffffffffa005f330>] __tipc_link_xmit+0x2b0/0x4d0 [tipc] [2102.440074] PGD 3fa3f067 PUD 3fa6b067 PMD 0 [2102.440074] Oops: 0000 [#1] SMP [2102.440074] CPU: 2 PID: 244 Comm: sender Not tainted 3.12.28 #1 [2102.440074] RIP: 0010:[<ffffffffa005f330>] [<ffffffffa005f330>] __tipc_link_xmit+0x2b0/0x4d0 [tipc] [...] [2102.440074] Call Trace: [2102.440074] [<ffffffff8163f0b9>] ? schedule+0x29/0x70 [2102.440074] [<ffffffffa006a756>] ? tipc_node_unlock+0x46/0x170 [tipc] [2102.440074] [<ffffffffa005f761>] tipc_link_xmit+0x51/0xf0 [tipc] [2102.440074] [<ffffffffa006d8ae>] tipc_send_stream+0x11e/0x4f0 [tipc] [2102.440074] [<ffffffff8106b150>] ? __wake_up_sync+0x20/0x20 [2102.440074] [<ffffffffa006dc9c>] tipc_send_packet+0x1c/0x20 [tipc] [2102.440074] [<ffffffff81502478>] sock_sendmsg+0xa8/0xd0 [2102.440074] [<ffffffff81507895>] ? release_sock+0x145/0x170 [2102.440074] [<ffffffff815030d8>] ___sys_sendmsg+0x3d8/0x3e0 [2102.440074] [<ffffffff816426ae>] ? _raw_spin_unlock+0xe/0x10 [2102.440074] [<ffffffff81115c2a>] ? handle_mm_fault+0x6ca/0x9d0 [2102.440074] [<ffffffff8107dd65>] ? set_next_entity+0x85/0xa0 [2102.440074] [<ffffffff816426de>] ? _raw_spin_unlock_irq+0xe/0x20 [2102.440074] [<ffffffff8107463c>] ? finish_task_switch+0x5c/0xc0 [2102.440074] [<ffffffff8163ea8c>] ? __schedule+0x34c/0x950 [2102.440074] [<ffffffff81504e12>] __sys_sendmsg+0x42/0x80 [2102.440074] [<ffffffff81504e62>] SyS_sendmsg+0x12/0x20 [2102.440074] [<ffffffff8164aed2>] system_call_fastpath+0x16/0x1b In this commit, we maintain the skb list always in the stack. Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Acked-by: NYing Xue <ying.xue@windriver.com> Acked-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 26 2月, 2016 3 次提交
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由 Florian Westphal 提交于
msg.dst_sk needs to be set up with a valid socket because some callbacks later derive the netns from it. Fixes: 263ea09084d172d ("Revert "genl: Add genlmsg_new_unicast() for unicast message allocation") Reported-by: NJon Maloy <maloy@donjonn.com> Bisected-by: NJon Maloy <maloy@donjonn.com> Signed-off-by: NFlorian Westphal <fw@strlen.de> Acked-by Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
When the TIPC module is unloaded, we have identified a race condition that allows a node reference counter to go to zero and the node instance being freed before the node timer is finished with accessing it. This leads to occasional crashes, especially in multi-namespace environments. The scenario goes as follows: CPU0:(node_stop) CPU1:(node_timeout) // ref == 2 1: if(!mod_timer()) 2: if (del_timer()) 3: tipc_node_put() // ref -> 1 4: tipc_node_put() // ref -> 0 5: kfree_rcu(node); 6: tipc_node_get(node) 7: // BOOM! We now clean up this functionality as follows: 1) We remove the node pointer from the node lookup table before we attempt deactivating the timer. This way, we reduce the risk that tipc_node_find() may obtain a valid pointer to an instance marked for deletion; a harmless but undesirable situation. 2) We use del_timer_sync() instead of del_timer() to safely deactivate the node timer without any risk that it might be reactivated by the timeout handler. There is no risk of deadlock here, since the two functions never touch the same spinlocks. 3: We remove a pointless tipc_node_get() + tipc_node_put() from the timeout handler. Reported-by: NZhijiang Hu <huzhijiang@gmail.com> Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
Although we have never seen it happen, we have identified the following problematic scenario when nodes are stopped and deleted: CPU0: CPU1: tipc_node_xxx() //ref == 1 tipc_node_put() //ref -> 0 tipc_node_find() // node still in table tipc_node_delete() list_del_rcu(n. list) tipc_node_get() //ref -> 1, bad kfree_rcu() tipc_node_put() //ref to 0 again. kfree_rcu() // BOOM! We fix this by introducing use of the conditional kref_get_if_not_zero() instead of kref_get() in the function tipc_node_find(). This eliminates any risk of post-mortem access. Reported-by: NZhijiang Hu <huzhijiang@gmail.com> Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 20 2月, 2016 1 次提交
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由 Insu Yun 提交于
tipc_bcast_unlock need to be unlocked in error path. Signed-off-by: NInsu Yun <wuninsu@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 19 2月, 2016 1 次提交
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由 Florian Westphal 提交于
This reverts commit bb9b18fb ("genl: Add genlmsg_new_unicast() for unicast message allocation")'. Nothing wrong with it; its no longer needed since this was only for mmapped netlink support. Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 17 2月, 2016 2 次提交
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由 Richard Alpe 提交于
Refactor tipc_node_xmit() to fail fast and fail early. Fix several potential memory leaks in unexpected error paths. Reported-by: NDmitry Vyukov <dvyukov@google.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NRichard Alpe <richard.alpe@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Jon Paul Maloy 提交于
In commit 52666986 ("tipc: let broadcast packet reception use new link receive function") we introduced a new per-node broadcast reception link instance. This link is created at the moment the node itself is created. Unfortunately, the allocation is done after the node instance has already been added to the node lookup hash table. This creates a potential race condition, where arriving broadcast packets are able to find and access the node before it has been fully initialized, and before the above mentioned link has been created. The result is occasional crashes in the function tipc_bcast_rcv(), which is trying to access the not-yet existing link. We fix this by deferring the addition of the node instance until after it has been fully initialized in the function tipc_node_create(). Acked-by: NYing Xue <ying.xue@windriver.com> Signed-off-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 06 2月, 2016 8 次提交
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由 Parthasarathy Bhuvaragan 提交于
Until now, tipc_rcv and tipc_send workqueues in server are allocated with parameters WQ_UNBOUND & max_active = 1. This parameters passed to this function makes it equivalent to alloc_ordered_workqueue(). The later form is more explicit and can inherit future ordered_workqueue changes. In this commit we replace alloc_workqueue() with more readable alloc_ordered_workqueue(). Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
Until now, we create timers even for the subscription requests with timeout = TIPC_WAIT_FOREVER. This can be improved by avoiding timer creation when the timeout is set to TIPC_WAIT_FOREVER. In this commit, we introduce a check to creates timers only when timeout != TIPC_WAIT_FOREVER. Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
Until now, during subscription creation the mod_time() & tipc_subscrb_get() are called after releasing the subscriber spin lock. In a SMP system when performing a subscription creation, if the subscription timeout occurs simultaneously (the timer is scheduled to run on another CPU) then the timer thread might decrement the subscribers refcount before the create thread increments the refcount. This can be simulated by creating subscription with timeout=0 and sometimes the timeout occurs before the create request is complete. This leads to the following message: [30.702949] BUG: spinlock bad magic on CPU#1, kworker/u8:3/87 [30.703834] general protection fault: 0000 [#1] SMP [30.704826] CPU: 1 PID: 87 Comm: kworker/u8:3 Not tainted 4.4.0-rc8+ #18 [30.704826] Workqueue: tipc_rcv tipc_recv_work [tipc] [30.704826] task: ffff88003f878600 ti: ffff88003fae0000 task.ti: ffff88003fae0000 [30.704826] RIP: 0010:[<ffffffff8109196c>] [<ffffffff8109196c>] spin_dump+0x5c/0xe0 [...] [30.704826] Call Trace: [30.704826] [<ffffffff81091a16>] spin_bug+0x26/0x30 [30.704826] [<ffffffff81091b75>] do_raw_spin_lock+0xe5/0x120 [30.704826] [<ffffffff81684439>] _raw_spin_lock_bh+0x19/0x20 [30.704826] [<ffffffffa0096f10>] tipc_subscrb_rcv_cb+0x1d0/0x330 [tipc] [30.704826] [<ffffffffa00a37b1>] tipc_receive_from_sock+0xc1/0x150 [tipc] [30.704826] [<ffffffffa00a31df>] tipc_recv_work+0x3f/0x80 [tipc] [30.704826] [<ffffffff8106a739>] process_one_work+0x149/0x3c0 [30.704826] [<ffffffff8106aa16>] worker_thread+0x66/0x460 [30.704826] [<ffffffff8106a9b0>] ? process_one_work+0x3c0/0x3c0 [30.704826] [<ffffffff8106a9b0>] ? process_one_work+0x3c0/0x3c0 [30.704826] [<ffffffff8107029d>] kthread+0xed/0x110 [30.704826] [<ffffffff810701b0>] ? kthread_create_on_node+0x190/0x190 [30.704826] [<ffffffff81684bdf>] ret_from_fork+0x3f/0x70 In this commit, 1. we remove the check for the return code for mod_timer() 2. we protect tipc_subscrb_get() using the subscriber spin lock. We increment the subscriber's refcount as soon as we add the subscription to subscriber's subscription list. Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
Until now, while creating a subscription the subscriber lock protects only the subscribers subscription list and not the nametable. The call to tipc_nametbl_subscribe() is outside the lock. However, at subscription timeout and cancel both the subscribers subscription list and the nametable are protected by the subscriber lock. This asymmetric locking mechanism leads to the following problem: In a SMP system, the timer can be fire on another core before the create request is complete. When the timer thread calls tipc_nametbl_unsubscribe() before create thread calls tipc_nametbl_subscribe(), we get a nullptr exception. This can be simulated by creating subscription with timeout=0 and sometimes the timeout occurs before the create request is complete. The following is the oops: [57.569661] BUG: unable to handle kernel NULL pointer dereference at (null) [57.577498] IP: [<ffffffffa02135aa>] tipc_nametbl_unsubscribe+0x8a/0x120 [tipc] [57.584820] PGD 0 [57.586834] Oops: 0002 [#1] SMP [57.685506] CPU: 14 PID: 10077 Comm: kworker/u40:1 Tainted: P OENX 3.12.48-52.27.1. 9688.1.PTF-default #1 [57.703637] Workqueue: tipc_rcv tipc_recv_work [tipc] [57.708697] task: ffff88064c7f00c0 ti: ffff880629ef4000 task.ti: ffff880629ef4000 [57.716181] RIP: 0010:[<ffffffffa02135aa>] [<ffffffffa02135aa>] tipc_nametbl_unsubscribe+0x8a/ 0x120 [tipc] [...] [57.812327] Call Trace: [57.814806] [<ffffffffa0211c77>] tipc_subscrp_delete+0x37/0x90 [tipc] [57.821357] [<ffffffffa0211e2f>] tipc_subscrp_timeout+0x3f/0x70 [tipc] [57.827982] [<ffffffff810618c1>] call_timer_fn+0x31/0x100 [57.833490] [<ffffffff81062709>] run_timer_softirq+0x1f9/0x2b0 [57.839414] [<ffffffff8105a795>] __do_softirq+0xe5/0x230 [57.844827] [<ffffffff81520d1c>] call_softirq+0x1c/0x30 [57.850150] [<ffffffff81004665>] do_softirq+0x55/0x90 [57.855285] [<ffffffff8105aa35>] irq_exit+0x95/0xa0 [57.860290] [<ffffffff815215b5>] smp_apic_timer_interrupt+0x45/0x60 [57.866644] [<ffffffff8152005d>] apic_timer_interrupt+0x6d/0x80 [57.872686] [<ffffffffa02121c5>] tipc_subscrb_rcv_cb+0x2a5/0x3f0 [tipc] [57.879425] [<ffffffffa021c65f>] tipc_receive_from_sock+0x9f/0x100 [tipc] [57.886324] [<ffffffffa021c826>] tipc_recv_work+0x26/0x60 [tipc] [57.892463] [<ffffffff8106fb22>] process_one_work+0x172/0x420 [57.898309] [<ffffffff8107079a>] worker_thread+0x11a/0x3c0 [57.903871] [<ffffffff81077114>] kthread+0xb4/0xc0 [57.908751] [<ffffffff8151f318>] ret_from_fork+0x58/0x90 In this commit, we do the following at subscription creation: 1. set the subscription's subscriber pointer before performing tipc_nametbl_subscribe(), as this value is required further in the call chain ex: by tipc_subscrp_send_event(). 2. move tipc_nametbl_subscribe() under the scope of subscriber lock Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
Until now, the subscribers endianness for a subscription create/cancel request is determined as: swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE)) The checks are performed only for port/service subscriptions. The swap calculation is incorrect if the filter in the subscription cancellation request is set to TIPC_SUB_CANCEL (it's a malformed cancel request, as the corresponding subscription create filter is missing). Thus, the check if the request is for cancellation fails and the request is treated as a subscription create request. The subscription creation fails as the request is illegal, which terminates this connection. In this commit we determine the endianness by including TIPC_SUB_CANCEL, which will set swap correctly and the request is processed as a cancellation request. Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
In 'commit 7fe8097c ("tipc: fix nullpointer bug when subscribing to events")', we terminate the connection if the subscription creation fails. In the same commit, the subscription creation result was based on the value of subscription pointer (set in the function) instead of the return code. Unfortunately, the same function also handles subscription cancellation request. For a subscription cancellation request, the subscription pointer cannot be set. Thus the connection is terminated during cancellation request. In this commit, we move the subcription cancel check outside of tipc_subscrp_create(). Hence, - tipc_subscrp_create() will create a subscripton - tipc_subscrb_rcv_cb() will subscribe or cancel a subscription. Fixes: 'commit 7fe8097c ("tipc: fix nullpointer bug when subscribing to events")' Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
In this commit, we split tipc_subscrp_create() into two: 1. tipc_subscrp_create() creates a subscription 2. A new function tipc_subscrp_subscribe() adds the subscription to the subscriber subscription list, activates the subscription timer and subscribes to the nametable updates. In future commits, the purpose of tipc_subscrb_rcv_cb() will be to either subscribe or cancel a subscription. There is no functional change in this commit. Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Parthasarathy Bhuvaragan 提交于
Until now, struct tipc_subscriber has duplicate fields for type, upper and lower (as member of struct tipc_name_seq) at: 1. as member seq in struct tipc_subscription 2. as member seq in struct tipc_subscr, which is contained in struct tipc_event The former structure contains the type, upper and lower values in network byte order and the later contains the intact copy of the request. The struct tipc_subscription contains a field swap to determine if request needs network byte order conversion. Thus by using swap, we can convert the request when required instead of duplicating it. In this commit, 1. we remove the references to these elements as members of struct tipc_subscription and replace them with elements from struct tipc_subscr. 2. provide new functions to convert the user request into network byte order. Acked-by: NYing Xue <ying.xue@windriver.com> Reviewed-by: NJon Maloy <jon.maloy@ericsson.com> Signed-off-by: NParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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