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2010-06-07ipmr: dont corrupt listsEric Dumazet
ipmr_rules_exit() and ip6mr_rules_exit() free a list of items, but forget to properly remove these items from list. List head is not changed and still points to freed memory. This can trigger a fault later when icmpv6_sk_exit() is called. Fix is to either reinit list, or use list_del() to properly remove items from list before freeing them. bugzilla report : https://bugzilla.kernel.org/show_bug.cgi?id=16120 Introduced by commit d1db275dd3f6e4 (ipv6: ip6mr: support multiple tables) and commit f0ad0860d01e (ipv4: ipmr: support multiple tables) Reported-by: Alex Zhavnerchik <alex.vizor@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-06-04tcp: use correct net ns in cookie_v4_check()Eric Dumazet
Its better to make a route lookup in appropriate namespace. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-06-04rps: tcp: fix rps_sock_flow_table table updatesEric Dumazet
I believe a moderate SYN flood attack can corrupt RFS flow table (rps_sock_flow_table), making RPS/RFS much less effective. Even in a normal situation, server handling short lived sessions suffer from bad steering for the first data packet of a session, if another SYN packet is received for another session. We do following action in tcp_v4_rcv() : sock_rps_save_rxhash(sk, skb->rxhash); We should _not_ do this if sk is a LISTEN socket, as about each packet received on a LISTEN socket has a different rxhash than previous one. -> RPS_NO_CPU markers are spread all over rps_sock_flow_table. Also, it makes sense to protect sk->rxhash field changes with socket lock (We currently can change it even if user thread owns the lock and might use rxhash) This patch moves sock_rps_save_rxhash() to a sock locked section, and only for non LISTEN sockets. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-06-04syncookies: remove Kconfig text line about disabled-by-defaultFlorian Westphal
syncookies default to on since e994b7c901ded7200b525a707c6da71f2cf6d4bb (tcp: Don't make syn cookies initial setting depend on CONFIG_SYSCTL). Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-06-02TCP: tcp_hybla: Fix integer overflow in slow start incrementDaniele Lacamera
For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16. Signed-off-by: Daniele Lacamera <root@danielinux.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-31net/ipv4/tcp_input.c: fix compilation breakage when FASTRETRANS_DEBUG > 1Joe Perches
Commit: c720c7e8383aff1cb219bddf474ed89d850336e3 missed these. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-31Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6
2010-05-31net: sock_queue_err_skb() dont mess with sk_forward_allocEric Dumazet
Correct sk_forward_alloc handling for error_queue would need to use a backlog of frames that softirq handler could not deliver because socket is owned by user thread. Or extend backlog processing to be able to process normal and error packets. Another possibility is to not use mem charge for error queue, this is what I implemented in this patch. Note: this reverts commit 29030374 (net: fix sk_forward_alloc corruptions), since we dont need to lock socket anymore. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-31netfilter: xtables: stackptr should be percpuEric Dumazet
commit f3c5c1bfd4 (netfilter: xtables: make ip_tables reentrant) introduced a performance regression, because stackptr array is shared by all cpus, adding cache line ping pongs. (16 cpus share a 64 bytes cache line) Fix this using alloc_percpu() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-By: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-31Merge branch 'master' of /home/davem/src/GIT/linux-2.6/David S. Miller
2010-05-29net: fix sk_forward_alloc corruptionsEric Dumazet
As David found out, sock_queue_err_skb() should be called with socket lock hold, or we risk sk_forward_alloc corruption, since we use non atomic operations to update this field. This patch adds bh_lock_sock()/bh_unlock_sock() pair to three spots. (BH already disabled) 1) skb_tstamp_tx() 2) Before calling ip_icmp_error(), in __udp4_lib_err() 3) Before calling ipv6_icmp_error(), in __udp6_lib_err() Reported-by: Anton Blanchard <anton@samba.org> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-28Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (22 commits) netlink: bug fix: wrong size was calculated for vfinfo list blob netlink: bug fix: don't overrun skbs on vf_port dump xt_tee: use skb_dst_drop() netdev/fec: fix ifconfig eth0 down hang issue cnic: Fix context memory init. on 5709. drivers/net: Eliminate a NULL pointer dereference drivers/net/hamradio: Eliminate a NULL pointer dereference be2net: Patch removes redundant while statement in loop. ipv6: Add GSO support on forwarding path net: fix __neigh_event_send() vhost: fix the memory leak which will happen when memory_access_ok fails vhost-net: fix to check the return value of copy_to/from_user() correctly vhost: fix to check the return value of copy_to/from_user() correctly vhost: Fix host panic if ioctl called with wrong index net: fix lock_sock_bh/unlock_sock_bh net/iucv: Add missing spin_unlock net: ll_temac: fix checksum offload logic net: ll_temac: fix interrupt bug when interrupt 0 is used sctp: dubious bitfields in sctp_transport ipmr: off by one in __ipmr_fill_mroute() ...
2010-05-27net: fix lock_sock_bh/unlock_sock_bhEric Dumazet
This new sock lock primitive was introduced to speedup some user context socket manipulation. But it is unsafe to protect two threads, one using regular lock_sock/release_sock, one using lock_sock_bh/unlock_sock_bh This patch changes lock_sock_bh to be careful against 'owned' state. If owned is found to be set, we must take the slow path. lock_sock_bh() now returns a boolean to say if the slow path was taken, and this boolean is used at unlock_sock_bh time to call the appropriate unlock function. After this change, BH are either disabled or enabled during the lock_sock_bh/unlock_sock_bh protected section. This might be misleading, so we rename these functions to lock_sock_fast()/unlock_sock_fast(). Reported-by: Anton Blanchard <anton@samba.org> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Tested-by: Anton Blanchard <anton@samba.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-26ipmr: off by one in __ipmr_fill_mroute()Dan Carpenter
This fixes a smatch warning: net/ipv4/ipmr.c +1917 __ipmr_fill_mroute(12) error: buffer overflow '(mrt)->vif_table' 32 <= 32 The ipv6 version had the same issue. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-25kernel-wide: replace USHORT_MAX, SHORT_MAX and SHORT_MIN with USHRT_MAX, ↵Alexey Dobriyan
SHRT_MAX and SHRT_MIN - C99 knows about USHRT_MAX/SHRT_MAX/SHRT_MIN, not USHORT_MAX/SHORT_MAX/SHORT_MIN. - Make SHRT_MIN of type s16, not int, for consistency. [akpm@linux-foundation.org: fix drivers/dma/timb_dma.c] [akpm@linux-foundation.org: fix security/keys/keyring.c] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1674 commits) qlcnic: adding co maintainer ixgbe: add support for active DA cables ixgbe: dcb, do not tag tc_prio_control frames ixgbe: fix ixgbe_tx_is_paused logic ixgbe: always enable vlan strip/insert when DCB is enabled ixgbe: remove some redundant code in setting FCoE FIP filter ixgbe: fix wrong offset to fc_frame_header in ixgbe_fcoe_ddp ixgbe: fix header len when unsplit packet overflows to data buffer ipv6: Never schedule DAD timer on dead address ipv6: Use POSTDAD state ipv6: Use state_lock to protect ifa state ipv6: Replace inet6_ifaddr->dead with state cxgb4: notify upper drivers if the device is already up when they load cxgb4: keep interrupts available when the ports are brought down cxgb4: fix initial addition of MAC address cnic: Return SPQ credit to bnx2x after ring setup and shutdown. cnic: Convert cnic_local_flags to atomic ops. can: Fix SJA1000 command register writes on SMP systems bridge: fix build for CONFIG_SYSFS disabled ARCNET: Limit com20020 PCI ID matches for SOHARD cards ... Fix up various conflicts with pcmcia tree drivers/net/ {pcmcia/3c589_cs.c, wireless/orinoco/orinoco_cs.c and wireless/orinoco/spectrum_cs.c} and feature removal (Documentation/feature-removal-schedule.txt). Also fix a non-content conflict due to pm_qos_requirement getting renamed in the PM tree (now pm_qos_request) in net/mac80211/scan.c
2010-05-20Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (44 commits) vlynq: make whole Kconfig-menu dependant on architecture add descriptive comment for TIF_MEMDIE task flag declaration. EEPROM: max6875: Header file cleanup EEPROM: 93cx6: Header file cleanup EEPROM: Header file cleanup agp: use NULL instead of 0 when pointer is needed rtc-v3020: make bitfield unsigned PCI: make bitfield unsigned jbd2: use NULL instead of 0 when pointer is needed cciss: fix shadows sparse warning doc: inode uses a mutex instead of a semaphore. uml: i386: Avoid redefinition of NR_syscalls fix "seperate" typos in comments cocbalt_lcdfb: correct sections doc: Change urls for sparse Powerpc: wii: Fix typo in comment i2o: cleanup some exit paths Documentation/: it's -> its where appropriate UML: Fix compiler warning due to missing task_struct declaration UML: add kernel.h include to signal.c ...
2010-05-17net: Remove unnecessary returns from void function()sJoe Perches
This patch removes from net/ (but not any netfilter files) all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: Introduce skb_tunnel_rx() helperEric Dumazet
skb rxhash should be cleared when a skb is handled by a tunnel before being delivered again, so that correct packet steering can take place. There are other cleanups and accounting that we can factorize in a new helper, skb_tunnel_rx() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17tcp: tcp_synack_options() fix Eric Dumazet
Commit 33ad798c924b4a (tcp: options clean up) introduced a problem if MD5+SACK+timestamps were used in initial SYN message. Some stacks (old linux for example) try to negotiate MD5+SACK+TSTAMP sessions, but since 40 bytes of tcp options space are not enough to store all the bits needed, we chose to disable timestamps in this case. We send a SYN-ACK _without_ timestamp option, but socket has timestamps enabled and all further outgoing messages contain a TS block, all with the initial timestamp of the remote peer. Fix is to really disable timestamps option for the whole session. Reported-by: Bijay Singh <Bijay.Singh@guavus.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: Remove unnecessary semicolons after switch statementsJoe Perches
Also added an explicit break; to avoid a fallthrough in net/ipv4/tcp_input.c Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: No dst refcounting in ip_queue_xmit()Eric Dumazet
TCP outgoing packets can avoid two atomic ops, and dirtying of previously higly contended cache line using new refdst infrastructure. Note 1: loopback device excluded because of !IFF_XMIT_DST_RELEASE Note 2: UDP packets dsts are built before ip_queue_xmit(). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: Use ip_route_input_noref() in input pathEric Dumazet
Use ip_route_input_noref() in ip fast path, to avoid two atomic ops per incoming packet. Note: loopback is excluded from this optimization in ip_rcv_finish() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: implements ip_route_input_noref()Eric Dumazet
ip_route_input() is the version returning a refcounted dst, while ip_route_input_noref() returns a non refcounted one. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: add a noref bit on skb dstEric Dumazet
Use low order bit of skb->_skb_dst to tell dst is not refcounted. Change _skb_dst to _skb_refdst to make sure all uses are catched. skb_dst() returns the dst, regardless of noref bit set or not, but with a lockdep check to make sure a noref dst is not given if current user is not rcu protected. New skb_dst_set_noref() helper to set an notrefcounted dst on a skb. (with lockdep check) skb_dst_drop() drops a reference only if skb dst was refcounted. skb_dst_force() helper is used to force a refcount on dst, when skb is queued and not anymore RCU protected. Use skb_dst_force() in __sk_add_backlog(), __dev_xmit_skb() if !IFF_XMIT_DST_RELEASE or skb enqueued on qdisc queue, in sock_queue_rcv_skb(), in __nf_queue(). Use skb_dst_force() in dev_requeue_skb(). Note: dst_use_noref() still dirties dst, we might transform it later to do one dirtying per jiffies. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-16Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: include/linux/if_link.h
2010-05-16net: Introduce sk_route_nocapsEric Dumazet
TCP-MD5 sessions have intermittent failures, when route cache is invalidated. ip_queue_xmit() has to find a new route, calls sk_setup_caps(sk, &rt->u.dst), destroying the sk->sk_route_caps &= ~NETIF_F_GSO_MASK that MD5 desperately try to make all over its way (from tcp_transmit_skb() for example) So we send few bad packets, and everything is fine when tcp_transmit_skb() is called again for this socket. Since ip_queue_xmit() is at a lower level than TCP-MD5, I chose to use a socket field, sk_route_nocaps, containing bits to mask on sk_route_caps. Reported-by: Bhaskar Dutta <bhaskie@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-16tcp: fix MD5 (RFC2385) supportEric Dumazet
TCP MD5 support uses percpu data for temporary storage. It currently disables preemption so that same storage cannot be reclaimed by another thread on same cpu. We also have to make sure a softirq handler wont try to use also same context. Various bug reports demonstrated corruptions. Fix is to disable preemption and BH. Reported-by: Bhaskar Dutta <bhaskie@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-15net: reserve ports for applications using fixed port numbersAmerigo Wang
(Dropped the infiniband part, because Tetsuo modified the related code, I will send a separate patch for it once this is accepted.) This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports which allows users to reserve ports for third-party applications. The reserved ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-13Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
2010-05-13netfilter: remove unnecessary returns from void function()sJoe Perches
This patch removes from net/ netfilter files all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches <joe@perches.com> [Patrick: changed to keep return statements in otherwise empty function bodies] Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-13netfilter: cleanup printk messagesStephen Hemminger
Make sure all printk messages have a severity level. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-13netfilter: change NF_ASSERT to WARN_ONStephen Hemminger
Change netfilter asserts to standard WARN_ON. This has the benefit of backtrace info and also causes netfilter errors to show up on kerneloops.org. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-12Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: Documentation/feature-removal-schedule.txt drivers/net/wireless/ath/ar9170/usb.c drivers/scsi/iscsi_tcp.c net/ipv4/ipmr.c
2010-05-11Merge branch 'master' of git://dev.medozas.de/linuxPatrick McHardy
2010-05-11netfilter: xtables: combine built-in extension structsJan Engelhardt
Prepare the arrays for use with the multiregister function. The future layer-3 xt matches can then be easily added to it without needing more (un)register code. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-11netfilter: xtables: change hotdrop pointer to direct modificationJan Engelhardt
Since xt_action_param is writable, let's use it. The pointer to 'bool hotdrop' always worried (8 bytes (64-bit) to write 1 byte!). Surprisingly results in a reduction in size: text data bss filename 5457066 692730 357892 vmlinux.o-prev 5456554 692730 357892 vmlinux.o Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-11netfilter: xtables: deconstify struct xt_action_param for matchesJan Engelhardt
In future, layer-3 matches will be an xt module of their own, and need to set the fragoff and thoff fields. Adding more pointers would needlessy increase memory requirements (esp. so for 64-bit, where pointers are wider). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-11netfilter: xtables: substitute temporary defines by final nameJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-11netfilter: xtables: combine struct xt_match_param and xt_target_paramJan Engelhardt
The structures carried - besides match/target - almost the same data. It is possible to combine them, as extensions are evaluated serially, and so, the callers end up a little smaller. text data bss filename -15318 740 104 net/ipv4/netfilter/ip_tables.o +15286 740 104 net/ipv4/netfilter/ip_tables.o -15333 540 152 net/ipv6/netfilter/ip6_tables.o +15269 540 152 net/ipv6/netfilter/ip6_tables.o Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-10Merge branch 'master' of /repos/git/net-next-2.6Patrick McHardy
Conflicts: net/bridge/br_device.c net/bridge/br_forward.c Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-10net: Fix FDDI and TR config checks in ipv4 arp and LLC.David S. Miller
Need to check both CONFIG_FOO and CONFIG_FOO_MODULE Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-10IPv4: unresolved multicast route cleanupAndreas Meissner
Fixes the expiration timer for unresolved multicast route entries. In case new multicast routing requests come in faster than the expiration timeout occurs (e.g. zap through multicast TV streams), the timer is prevented from being called at time for already existing entries. As the single timer is resetted to default whenever a new entry is made, the timeout for existing unresolved entires are missed and/or not updated. As a consequence new requests are denied when the limit of unresolved entries has been reached because old entries live longer than they are supposed to. The solution is to reset the timer only for the first unresolved entry in the multicast routing cache. All other timers are already set and updated correctly within the timer function itself by now. Signed-off by: Andreas Meissner <andreas.meissner@sphairon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-08ipv4: remove ip_rt_secret timer (v4)Neil Horman
A while back there was a discussion regarding the rt_secret_interval timer. Given that we've had the ability to do emergency route cache rebuilds for awhile now, based on a statistical analysis of the various hash chain lengths in the cache, the use of the flush timer is somewhat redundant. This patch removes the rt_secret_interval sysctl, allowing us to rely solely on the statistical analysis mechanism to determine the need for route cache flushes. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-06ipv4: udp: fix short packet and bad checksum loggingBjørn Mork
commit 2783ef23 moved the initialisation of saddr and daddr after pskb_may_pull() to avoid a potential data corruption. Unfortunately also placing it after the short packet and bad checksum error paths, where these variables are used for logging. The result is bogus output like [92238.389505] UDP: short packet: From 2.0.0.0:65535 23715/178 to 0.0.0.0:65535 Moving the saddr and daddr initialisation above the error paths, while still keeping it after the pskb_may_pull() to keep the fix from commit 2783ef23. Signed-off-by: Bjørn Mork <bjorn@mork.no> Cc: stable@kernel.org Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-02Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-05-02netfilter: xtables: dissolve do_match functionJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-05-02netfilter: ip_tables: fix compilation when debug is enabledJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-04-28net: ip_queue_rcv_skb() helperEric Dumazet
When queueing a skb to socket, we can immediately release its dst if target socket do not use IP_CMSG_PKTINFO. tcp_data_queue() can drop dst too. This to benefit from a hot cache line and avoid the receiver, possibly on another cpu, to dirty this cache line himself. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-28net: speedup udp receive pathEric Dumazet
Since commit 95766fff ([UDP]: Add memory accounting.), each received packet needs one extra sock_lock()/sock_release() pair. This added latency because of possible backlog handling. Then later, ticket spinlocks added yet another latency source in case of DDOS. This patch introduces lock_sock_bh() and unlock_sock_bh() synchronization primitives, avoiding one atomic operation and backlog processing. skb_free_datagram_locked() uses them instead of full blown lock_sock()/release_sock(). skb is orphaned inside locked section for proper socket memory reclaim, and finally freed outside of it. UDP receive path now take the socket spinlock only once. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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