- 31 Oct, 2011 1 commit
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Paul Gortmaker authored
With calls to modular infrastructure, these files really needs the full module.h header. Call it out so some of the cleanups of implicit and unrequired includes elsewhere can be cleaned up. Signed-off-by:Paul Gortmaker <paul.gortmaker@windriver.com>
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- 24 Oct, 2011 1 commit
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Eric Dumazet authored
There is a long standing bug in linux tcp stack, about ACK messages sent on behalf of TIME_WAIT sockets. In the IP header of the ACK message, we choose to reflect TOS field of incoming message, and this might break some setups. Example of things that were broken : - Routing using TOS as a selector - Firewalls - Trafic classification / shaping We now remember in timewait structure the inet tos field and use it in ACK generation, and route lookup. Notes : - We still reflect incoming TOS in RST messages. - We could extend MuraliRaja Muniraju patch to report TOS value in netlink messages for TIME_WAIT sockets. - A patch is needed for IPv6 Signed-off-by:
Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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- 20 Feb, 2011 1 commit
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Eric Dumazet authored
Eric W. Biederman reported a lockdep splat in inet_twsk_deschedule() This is caused by inet_twsk_purge(), run from process context, and commit 575f4cd5 (net: Use rcu lookups in inet_twsk_purge.) removed the BH disabling that was necessary. Add the BH disabling but fine grained, right before calling inet_twsk_deschedule(), instead of whole function. With help from Linus Torvalds and Eric W. Biederman Reported-by:
Eric W. Biederman <ebiederm@xmission.com> Signed-off-by:
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- 30 Mar, 2010 1 commit
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Tejun Heo authored
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include bloc...
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- 09 Dec, 2009 2 commits
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Eric Dumazet authored
Adds kerneldoc for inet_twsk_unhash() & inet_twsk_bind_unhash(). With help from Randy Dunlap. Suggested-by:
Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by:
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Eric Dumazet authored
When we find a timewait connection in __inet_hash_connect() and reuse it for a new connection request, we have a race window, releasing bind list lock and reacquiring it in __inet_twsk_kill() to remove timewait socket from list. Another thread might find the timewait socket we already chose, leading to list corruption and crashes. Fix is to remove timewait socket from bind list before releasing the bind lock. Note: This problem happens if sysctl_tcp_tw_reuse is set. Reported-by:
kapil dakhane <kdakhane@gmail.com> Signed-off-by:
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- 04 Dec, 2009 2 commits
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Eric Dumazet authored
After TCP RCU conversion, tw->tw_refcnt should not be set to 1 in inet_twsk_alloc(). It allows a RCU reader to get this timewait socket, while we not yet stabilized it. Only choice we have is to set tw_refcnt to 0 in inet_twsk_alloc(), then atomic_add() it later, once everything is done. Location of this atomic_add() is tricky, because we dont want another writer to find this timewait in ehash, while tw_refcnt is still zero ! Thanks to Kapil Dakhane tests and reports. Signed-off-by:
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Eric Dumazet authored
Its currently possible that several threads issuing a connect() find the same timewait socket and try to reuse it, leading to list corruptions. Condition for bug is that these threads bound their socket on same address/port of to-be-find timewait socket, and connected to same target. (SO_REUSEADDR needed) To fix this problem, we could unhash timewait socket while holding ehash lock, to make sure lookups/changes will be serialized. Only first thread finds the timewait socket, other ones find the established socket and return an EADDRNOTAVAIL error. This second version takes into account Evgeniy's review and makes sure inet_twsk_put() is called outside of locked sections. Signed-off-by:
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- 03 Dec, 2009 2 commits
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Eric W. Biederman authored
This function walks the whole hashtable so there is no point in passing it a network namespace. Instead I purge all timewait sockets from dead network namespaces that I find. If the namespace is one of the once I am trying to purge I am guaranteed no new timewait sockets can be formed so this will get them all. If the namespace is one I am not acting for it might form a few more but I will call inet_twsk_purge again and shortly to get rid of them. In any even if the network namespace is dead timewait sockets are useless. Move the calls of inet_twsk_purge into batch_exit routines so that if I am killing a bunch of namespaces at once I will just call inet_twsk_purge once and save a lot of redundant unnecessary work. My simple 4k network namespace exit test the cleanup time dropped from roughly 8.2s to 1.6s. While the time spent running inet_twsk_purge fell to about 2ms. 1ms for ipv4 and 1ms for ipv6. Signed-off-by:
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Eric W. Biederman authored
While we are looking up entries to free there is no reason to take the lock in inet_twsk_purge. We have to drop locks and restart occassionally anyway so adding a few more in case we get on the wrong list because of a timewait move is no big deal. At the same time not taking the lock for long periods of time is much more polite to the rest of the users of the hash table. In my test configuration of killing 4k network namespaces this change causes 4k back to back runs of inet_twsk_purge on an empty hash table to go from roughly 20.7s to 3.3s, and the total time to destroy 4k network namespaces goes from roughly 44s to 3.3s. Signed-off-by:
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- 19 Oct, 2009 1 commit
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Eric Dumazet authored
In order to have better cache layouts of struct sock (separate zones for rx/tx paths), we need this preliminary patch. Goal is to transfert fields used at lookup time in the first read-mostly cache line (inside struct sock_common) and move sk_refcnt to a separate cache line (only written by rx path) This patch adds inet_ prefix to daddr, rcv_saddr, dport, num, saddr, sport and id fields. This allows a future patch to define these fields as macros, like sk_refcnt, without name clashes. Signed-off-by:
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- 13 Oct, 2009 1 commit
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Eric Dumazet authored
Storing the mask (size - 1) instead of the size allows fast path to be a bit faster. Signed-off-by:
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- 29 Aug, 2009 1 commit
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Octavian Purdila authored
There is a race condition in the time-wait sockets code that can lead to premature termination of FIN_WAIT2 and, subsequently, to RST generation when the FIN,ACK from the peer finally arrives: Time TCP header 0.000000 30755 > http [SYN] Seq=0 Win=2920 Len=0 MSS=1460 TSV=282912 TSER=0 0.000008 http > 30755 aSYN, ACK] Seq=0 Ack=1 Win=2896 Len=0 MSS=1460 TSV=... 0.136899 HEAD /1b.html?n1Lg=v1 HTTP/1.0 [Packet size limited during capture] 0.136934 HTTP/1.0 200 OK [Packet size limited during capture] 0.136945 http > 30755 [FIN, ACK] Seq=187 Ack=207 Win=2690 Len=0 TSV=270521... 0.136974 30755 > http [ACK] Seq=207 Ack=187 Win=2734 Len=0 TSV=283049 TSER=... 0.177983 30755 > http [ACK] Seq=207 Ack=188 Win=2733 Len=0 TSV=283089 TSER=... 0.238618 30755 > http [FIN, ACK] Seq=207 Ack=188 Win=2733 Len=0 TSV=283151... 0.238625 http > 30755 [RST] Seq=188 Win=0 Len=0 Say twdr->slot = 1 and we are running inet_twdr_hangman and in this instance inet_twdr_do_twkill_work returns 1. At that point we will mark slot 1 and schedule inet_twdr_twkill_work. We will also make twdr->slot = 2. Next, a connection is closed and tcp_time_wait(TCP_FIN_WAIT2, timeo) is called which will create a new FIN_WAIT2 time-wait socket and will place it in the last to be reached slot, i.e. twdr->slot = 1. At this point say inet_twdr_twkill_work will run which will start destroying the time-wait sockets in slot 1, including the just added TCP_FIN_WAIT2 one. To avoid this issue we increment the slot only if all entries in the slot have been purged. This change may delay the slots cleanup by a time-wait death row period but only if the worker thread didn't had the time to run/purge the current slot in the next period (6 seconds with default sysctl settings). However, on such a busy system even without this change we would probably see delays... Signed-off-by:
Octavian Purdila <opurdila@ixiacom.com> Signed-off-by:
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- 15 Jun, 2009 1 commit
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Vegard Nossum authored
The use of bitfields here would lead to false positive warnings with kmemcheck. Silence them. (Additionally, one erroneous comment related to the bitfield was also fixed.) Signed-off-by:Vegard Nossum <vegard.nossum@gmail.com>
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- 06 May, 2009 1 commit
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Arnaldo Carvalho de Melo authored
By separating the freeing code from the refcounting decrementing. Probably reducing icache pressure when we still have reference counts to go. Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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- 21 Nov, 2008 1 commit
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Eric Dumazet authored
Now TCP & DCCP use RCU lookups, we can convert ehash rwlocks to spinlocks. /proc/net/tcp and other seq_file 'readers' can safely be converted to 'writers'. This should speedup writers, since spin_lock()/spin_unlock() only use one atomic operation instead of two for write_lock()/write_unlock() Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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- 17 Nov, 2008 1 commit
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Eric Dumazet authored
RCU was added to UDP lookups, using a fast infrastructure : - sockets kmem_cache use SLAB_DESTROY_BY_RCU and dont pay the price of call_rcu() at freeing time. - hlist_nulls permits to use few memory barriers. This patch uses same infrastructure for TCP/DCCP established and timewait sockets. Thanks to SLAB_DESTROY_BY_RCU, no slowdown for applications using short lived TCP connections. A followup patch, converting rwlocks to spinlocks will even speedup this case. __inet_lookup_established() is pretty fast now we dont have to dirty a contended cache line (read_lock/read_unlock) Only established and timewait hashtable are converted to RCU (bind table and listen table are still using traditional locking) Signed-off-by:
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- 01 Oct, 2008 1 commit
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KOVACS Krisztian authored
This patch introduces the IP_TRANSPARENT socket option: enabling that will make the IPv4 routing omit the non-local source address check on output. Setting IP_TRANSPARENT requires NET_ADMIN capability. Signed-off-by:
KOVACS Krisztian <hidden@sch.bme.hu> Signed-off-by:
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- 08 Sep, 2008 1 commit
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Daniel Lezcano authored
How to reproduce ? - create a network namespace - use tcp protocol and get timewait socket - exit the network namespace - after a moment (when the timewait socket is destroyed), the kernel panics. # BUG: unable to handle kernel NULL pointer dereference at 0000000000000007 IP: [<ffffffff821e394d>] inet_twdr_do_twkill_work+0x6e/0xb8 PGD 119985067 PUD 11c5c0067 PMD 0 Oops: 0000 [1] SMP CPU 1 Modules linked in: ipv6 button battery ac loop dm_mod tg3 libphy ext3 jbd edd fan thermal processor thermal_sys sg sata_svw libata dock serverworks sd_mod scsi_mod ide_disk ide_core [last unloaded: freq_table] Pid: 0, comm: swapper Not tainted 2.6.27-rc2 #3 RIP: 0010:[<ffffffff821e394d>] [<ffffffff821e394d>] inet_twdr_do_twkill_work+0x6e/0xb8 RSP: 0018:ffff88011ff7fed0 EFLAGS: 00010246 RAX: ffffffffffffffff RBX: ffffffff82339420 RCX: ffff88011ff7ff30 RDX: 0000000000000001 RSI: ffff88011a4d03c0 RDI: ffff88011ac2fc00 RBP: ffffffff823392e0 R08: 0000000000000000 R09: ffff88002802a200 R10: ffff8800a5c4b000 R11: ffffffff823e4080 R12: ffff88011ac2fc00 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000041cbd940(0000) GS:ffff8800bff839c0(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000007 CR3: 00000000bd87c000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 0, threadinfo ffff8800bff9e000, task ffff88011ff76690) Stack: ffffffff823392e0 0000000000000100 ffffffff821e3a3a 0000000000000008 0000000000000000 ffffffff821e3a61 ffff8800bff7c000 ffffffff8203c7e7 ffff88011ff7ff10 ffff88011ff7ff10 0000000000000021 ffffffff82351108 Call Trace: <IRQ> [<ffffffff821e3a3a>] ? inet_twdr_hangman+0x0/0x9e [<ffffffff821e3a61>] ? inet_twdr_hangman+0x27/0x9e [<ffffffff8203c7e7>] ? run_timer_softirq+0x12c/0x193 [<ffffffff820390d1>] ? __do_softirq+0x5e/0xcd [<ffffffff8200d08c>] ? call_softirq+0x1c/0x28 [<ffffffff8200e611>] ? do_softirq+0x2c/0x68 [<ffffffff8201a055>] ? smp_apic_timer_interrupt+0x8e/0xa9 [<ffffffff8200cad6>] ? apic_timer_interrupt+0x66/0x70 <EOI> [<ffffffff82011f4c>] ? default_idle+0x27/0x3b [<ffffffff8200abbd>] ? cpu_idle+0x5f/0x7d Code: e8 01 00 00 4c 89 e7 41 ff c5 e8 8d fd ff ff 49 8b 44 24 38 4c 89 e7 65 8b 14 25 24 00 00 00 89 d2 48 8b 80 e8 00 00 00 48 f7 d0 <48> 8b 04 d0 48 ff 40 58 e8 fc fc ff ff 48 89 df e8 c0 5f 04 00 RIP [<ffffffff821e394d>] inet_twdr_do_twkill_work+0x6e/0xb8 RSP <ffff88011ff7fed0> CR2: 0000000000000007 This patch provides a function to purge all timewait sockets related to a network namespace. The timewait sockets life cycle is not tied with the network namespace, that means the timewait sockets stay alive while the network namespace dies. The timewait sockets are for avoiding to receive a duplicate packet from the network, if the network namespace is freed, the network stack is removed, so no chance to receive any packets from the outside world. Furthermore, having a pending destruction timer on these sockets with a network namespace freed is not safe and will lead to an oops if the timer callback which try to access data belonging to the namespace like for example in: inet_twdr_do_twkill_work -> NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITED); Purging the timewait sockets at the network namespace destruction will: 1) speed up memory freeing for the namespace 2) fix kernel panic on asynchronous timewait destruction Signed-off-by:
Daniel Lezcano <dlezcano@fr.ibm.com> Acked-by:
Denis V. Lunev <den@openvz.org> Acked-by:
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- 26 Jul, 2008 1 commit
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Ilpo Järvinen authored
Removes legacy reinvent-the-wheel type thing. The generic machinery integrates much better to automated debugging aids such as kerneloops.org (and others), and is unambiguous due to better naming. Non-intuively BUG_TRAP() is actually equal to WARN_ON() rather than BUG_ON() though some might actually be promoted to BUG_ON() but I left that to future. I could make at least one BUILD_BUG_ON conversion. Signed-off-by:
Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by:
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- 17 Jul, 2008 1 commit
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Pavel Emelyanov authored
This one is tricky. The thing is that this macro is only used when killing tw buckets, but since this killer is promiscuous wrt to which net each particular tw belongs to, I have to use it only when NET_NS is off. When the net namespaces are on, I use the INET_INC_STATS_BH for each bucket. Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Signed-off-by:
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- 17 Jun, 2008 1 commit
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Pavel Emelyanov authored
Binding to some port in many namespaces may create too long chains in bhash-es, so prepare the hashfn to take struct net into account. Signed-off-by:
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- 16 Apr, 2008 1 commit
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Denis V. Lunev authored
Signed-off-by:
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- 11 Apr, 2008 1 commit
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Daniel Lezcano authored
Copy the network namespace from the socket to the timewait socket. Signed-off-by:
Mark Lord <mlord@pobox.com> Signed-off-by:
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- 01 Apr, 2008 1 commit
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Pavel Emelyanov authored
This counter is about to become per-proto-and-per-net, so we'll need two arguments to determine which cell in this "table" to work with. All the places, but proc already pass proper net to it - proc will be tuned a bit later. Some indentation with spaces in proc files is done to keep the file coding style consistent. Signed-off-by:
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- 25 Mar, 2008 1 commit
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YOSHIFUJI Hideaki authored
Introduce per-sock inlines: sock_net(), sock_net_set() and per-inet_timewait_sock inlines: twsk_net(), twsk_net_set(). Without CONFIG_NET_NS, no namespace other than &init_net exists. Let's explicitly define them to help compiler optimizations. Signed-off-by:YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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- 21 Mar, 2008 1 commit
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Daniel Lezcano authored
Copy the network namespace from the socket to the timewait socket. Signed-off-by:
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- 28 Jan, 2008 3 commits
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Eric Dumazet authored
1) Cleanups (all functions are prefixed by sock_prot_inuse) sock_prot_inc_use(prot) -> sock_prot_inuse_add(prot,-1) sock_prot_dec_use(prot) -> sock_prot_inuse_add(prot,-1) sock_prot_inuse() -> sock_prot_inuse_get() New functions : sock_prot_inuse_init() and sock_prot_inuse_free() to abstract pcounter use. 2) if CONFIG_PROC_FS=n, we can zap 'inuse' member from "struct proto", since nobody wants to read the inuse value. This saves 1372 bytes on i386/SMP and some cpu cycles. Signed-off-by:
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Pavel Emelyanov authored
This one is not that big, but is widely used: saves 1200 bytes from net/ipv4/built-in.o add/remove: 1/0 grow/shrink: 1/12 up/down: 97/-1300 (-1203) function old new delta inet_twsk_put - 87 +87 __inet_lookup_listener 274 284 +10 tcp_sacktag_write_queue 2255 2254 -1 tcp_time_wait 482 411 -71 __inet_check_established 796 722 -74 tcp_v4_err 973 898 -75 __inet_twsk_kill 230 154 -76 inet_twsk_deschedule 180 103 -77 tcp_v4_do_rcv 462 384 -78 inet_hash_connect 686 607 -79 inet_twdr_do_twkill_work 236 150 -86 inet_twdr_twcal_tick 395 307 -88 tcp_v4_rcv 1744 1480 -264 tcp_timewait_state_process 975 644 -331 Export it for ipv6 module. Signed-off-by:
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Pavel Emelyanov authored
Make the INET_TWDR_TWKILL_SLOTS vs sizeof(twdr->thread_slots) check nicer. Signed-off-by:
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- 07 Nov, 2007 1 commit
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Eric Dumazet authored
As done two years ago on IP route cache table (commit 22c047cc ) , we can avoid using one lock per hash bucket for the huge TCP/DCCP hash tables. On a typical x86_64 platform, this saves about 2MB or 4MB of ram, for litle performance differences. (we hit a different cache line for the rwlock, but then the bucket cache line have a better sharing factor among cpus, since we dirty it less often). For netstat or ss commands that want a full scan of hash table, we perform fewer memory accesses. Using a 'small' table of hashed rwlocks should be more than enough to provide correct SMP concurrency between different buckets, without using too much memory. Sizing of this table depends on num_possible_cpus() and various CONFIG settings. This patch provides some locking abstraction that may ease a future work using a different model for TCP/DCCP table. Signed-off-by:
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- 10 Oct, 2007 1 commit
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Ilpo Järvinen authored
Hopefully captured all single statement cases under net/. I'm not too sure if there is some policy about #includes that are "guaranteed" (ie., in the current tree) to be available through some other #included header, so I just added linux/kernel.h to each changed file that didn't #include it previously. Signed-off-by:
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- 15 Jul, 2007 1 commit
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Adrian Bunk authored
This patch makes the needlessly global __inet_twsk_kill() static. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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- 08 Feb, 2007 1 commit
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Eric Dumazet authored
ehash table layout is currently this one : First half of this table is used by sockets not in TIME_WAIT state Second half of it is used by sockets in TIME_WAIT state. This is non optimal because of for a given hash or socket, the two chain heads are located in separate cache lines. Moreover the locks of the second half are never used. If instead of this halving, we use two list heads in inet_ehash_bucket instead of only one, we probably can avoid one cache miss, and reduce ram usage, particularly if sizeof(rwlock_t) is big (various CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_LOCK_ALLOC settings). So we still halves the table but we keep together related chains to speedup lookups and socket state change. In this patch I did not try to align struct inet_ehash_bucket, but a future patch could try to make this structure have a convenient size (a power of two or a multiple of L1_CACHE_SIZE). I guess rwlock will just vanish as soon as RCU is plugged into ehash :) , so maybe we dont need to scratch our heads to align the bucket... Note : In case struct inet_ehash_bucket is not a power of two, we could probably change alloc_large_system_hash() (in case it use __get_free_pages()) to free the unused space. It currently allocates a big zone, but the last quarter of it could be freed. Again, this should be a temporary 'problem'. Patch tested on ipv4 tcp only, but should be OK for IPV6 and DCCP. Signed-off-by:
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- 07 Dec, 2006 3 commits
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Christoph Lameter authored
SLAB_ATOMIC is an alias of GFP_ATOMIC Signed-off-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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David S. Miller authored
As per Ralf Baechle's observations, the schedule_work() call should give enough of a memory barrier, so the explicit one here is totally unnecessary. Signed-off-by: -
Ralf Baechle authored
I believe all the below memory barriers only matter on SMP so therefore the smp_* variant of the barrier should be used. I'm wondering if the barrier in net/ipv4/inet_timewait_sock.c should be dropped entirely. schedule_work's implementation currently implies a memory barrier and I think sane semantics of schedule_work() should imply a memory barrier, as needed so the caller shouldn't have to worry. It's not quite obvious why the barrier in net/packet/af_packet.c is needed; maybe it should be implied through flush_dcache_page? Signed-off-by:
Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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- 22 Nov, 2006 1 commit
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David Howells authored
Pass the work_struct pointer to the work function rather than context data. The work function can use container_of() to work out the data. For the cases where the container of the work_struct may go away the moment the pending bit is cleared, it is made possible to defer the release of the structure by deferring the clearing of the pending bit. To make this work, an extra flag is introduced into the management side of the work_struct. This governs auto-release of the structure upon execution. Ordinarily, the work queue executor would release the work_struct for further scheduling or deallocation by clearing the pending bit prior to jumping to the work function. This means that, unless the driver makes some guarantee itself that the work_struct won't go away, the work function may not access anything else in the work_struct or its container lest they be deallocated.. This is a problem if the auxiliary data is taken away (as done by the last patch). However, if the pending bit is *not* cleared before jumping to the work function, then the work function *may* access the work_struct and its container with no problems. But then the work function must itself release the work_struct by calling work_release(). In most cases, automatic release is fine, so this is the default. Special initiators exist for the non-auto-release case (ending in _NAR). Signed-Off-By:David Howells <dhowells@redhat.com>
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- 30 Jun, 2006 1 commit
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Jörn Engel authored
Signed-off-by:
Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by:
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- 03 Jan, 2006 1 commit
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Arnaldo Carvalho de Melo authored
So that we can share several timewait sockets related functions and make the timewait mini sockets infrastructure closer to the request mini sockets one. Next changesets will take advantage of this, moving more code out of TCP and DCCP v4 and v6 to common infrastructure. Signed-off-by:
Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by:
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