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linux/net/netfilter
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Stephen Hemminger 13ee6ac579 netfilter: fix race in conntrack between dump_table and destroy 
The netlink interface to dump the connection tracking table has a race
when entries are deleted at the same time. A customer reported a crash
and the backtrace showed thatctnetlink_dump_table was running while a
conntrack entry was being destroyed.
(see https://bugzilla.vyatta.com/show_bug.cgi?id=6402).

According to RCU documentation, when using hlist_nulls the reader
must handle the case of seeing a deleted entry and not proceed
further down the linked list.  The old code would continue
which caused the scan to walk into the free list.

This patch uses locking (rather than RCU) for this operation which
is guaranteed safe, and no longer requires getting reference while
doing dump operation.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-01-11 23:54:42 +01:00
..
ipvs Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
core.c netfilter: allow hooks to pass error code back up the stack 2010-11-17 10:54:34 -08:00
Kconfig netfilter: fix module dependency issues with IPv6 defragmentation, ip6tables and xt_TPROXY 2010-10-25 13:58:36 -07:00
Makefile netfilter: add xt_cpu match 2010-07-23 12:59:36 +02:00
nf_conntrack_acct.c netfilter: complete the deprecation of CONFIG_NF_CT_ACCT 2010-06-25 14:46:56 +02:00
nf_conntrack_amanda.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_conntrack_core.c netfilter: fix the race when initializing nf_ct_expect_hash_rnd 2011-01-06 11:22:20 -08:00
nf_conntrack_ecache.c net/netfilter: __rcu annotations 2010-08-19 17:18:01 -07:00
nf_conntrack_expect.c netfilter: fix the race when initializing nf_ct_expect_hash_rnd 2011-01-06 11:22:20 -08:00
nf_conntrack_extend.c Merge commit 'v2.6.36-rc7' into core/rcu 2010-10-07 09:43:45 +02:00
nf_conntrack_ftp.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_conntrack_h323_asn1.c [NETFILTER]: nf_conntrack_h323: constify and annotate H.323 helper 2008-01-31 19:28:07 -08:00
nf_conntrack_h323_main.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
nf_conntrack_h323_types.c [NETFILTER]: nf_conntrack_h323: constify and annotate H.323 helper 2008-01-31 19:28:07 -08:00
nf_conntrack_helper.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nf_conntrack_irc.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_conntrack_l3proto_generic.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l3proto 2008-04-14 11:15:52 +02:00
nf_conntrack_netbios_ns.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
nf_conntrack_netlink.c netfilter: fix race in conntrack between dump_table and destroy 2011-01-11 23:54:42 +01:00
nf_conntrack_pptp.c netfilter: nf_conntrack: add support for "conntrack zones" 2010-02-15 18:13:33 +01:00
nf_conntrack_proto_dccp.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nf_conntrack_proto_generic.c sysctl net: Remove unused binary sysctl code 2009-11-12 02:05:06 -08:00
nf_conntrack_proto_gre.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nf_conntrack_proto_sctp.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_conntrack_proto_tcp.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
nf_conntrack_proto_udp.c netfilter: nf_conntrack: pass template to l4proto ->error() handler 2010-02-15 17:45:08 +01:00
nf_conntrack_proto_udplite.c netfilter: nf_conntrack: pass template to l4proto ->error() handler 2010-02-15 17:45:08 +01:00
nf_conntrack_proto.c netfilter: fix nf_conntrack_l4proto_register() 2010-10-29 19:59:40 +02:00
nf_conntrack_sane.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
nf_conntrack_sip.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2010-10-21 08:21:34 -07:00
nf_conntrack_standalone.c netfilter: fix export secctx error handling 2011-01-06 11:25:00 -08:00
nf_conntrack_tftp.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_internals.h netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
nf_log.c net/netfilter: __rcu annotations 2010-08-19 17:18:01 -07:00
nf_queue.c net/netfilter: __rcu annotations 2010-08-19 17:18:01 -07:00
nf_sockopt.c net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
nf_tproxy_core.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2010-10-21 08:21:34 -07:00
nfnetlink_log.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2010-06-15 13:49:24 -07:00
nfnetlink_queue.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2010-06-15 13:49:24 -07:00
nfnetlink.c netfilter: cleanup printk messages 2010-05-13 15:02:08 +02:00
x_tables.c netfilter: x_tables: dont block BH while reading counters 2011-01-10 20:11:38 +01:00
xt_CHECKSUM.c netfilter: add CHECKSUM target 2010-07-15 17:20:46 +02:00
xt_CLASSIFY.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_cluster.c netfilter: nf_conntrack: IPS_UNTRACKED bit 2010-06-08 16:09:52 +02:00
xt_comment.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_connbytes.c netfilter: xt_connbytes: Force CT accounting to be enabled 2010-06-25 14:44:07 +02:00
xt_connlimit.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_connmark.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_CONNSECMARK.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_conntrack.c netfilter: nf_conntrack: IPS_UNTRACKED bit 2010-06-08 16:09:52 +02:00
xt_cpu.c netfilter: add xt_cpu match 2010-07-23 12:59:36 +02:00
xt_CT.c secmark: make secmark object handling generic 2010-10-21 10:12:48 +11:00
xt_dccp.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_dscp.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_DSCP.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_esp.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_hashlimit.c netfilter: xt_hashlimit: use proto_ports_offset() to support AH message 2010-08-19 17:16:25 -07:00
xt_helper.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_hl.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_HL.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_IDLETIMER.c netfilter: xt_IDLETIMER needs kdev_t.h 2010-06-22 08:13:31 +02:00
xt_iprange.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_ipvs.c netfilter: remove duplicated include 2010-10-04 21:00:42 +02:00
xt_LED.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_length.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_limit.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_mac.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_mark.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_multiport.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_NFLOG.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_NFQUEUE.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_NOTRACK.c netfilter: nf_conntrack: IPS_UNTRACKED bit 2010-06-08 16:09:52 +02:00
xt_osf.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_owner.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_physdev.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_pkttype.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_policy.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_quota.c xt_quota: report initial quota value instead of current value to userspace 2010-07-23 14:07:47 +02:00
xt_rateest.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_RATEEST.c pkt_sched: gen_kill_estimator() rcu fixes 2010-06-11 18:37:08 -07:00
xt_realm.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_recent.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
xt_repldata.h netfilter: xtables: generate initial table on-demand 2010-02-10 17:50:47 +01:00
xt_sctp.c netfilter: xt_sctp: use WORD_ROUND macro to calculate length of multiple of 4 bytes 2010-06-09 14:47:40 +02:00
xt_SECMARK.c secmark: make secmark object handling generic 2010-10-21 10:12:48 +11:00
xt_socket.c netfilter: xt_socket: Make tproto signed in socket_mt6_v1(). 2010-10-28 12:59:53 -07:00
xt_state.c netfilter: nf_conntrack: IPS_UNTRACKED bit 2010-06-08 16:09:52 +02:00
xt_statistic.c netfilter: xt_statistic: remove nth_lock spinlock 2010-06-01 12:00:41 +02:00
xt_string.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00
xt_tcpmss.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_TCPMSS.c tcp: unify tcp flag macros 2010-06-15 11:56:19 -07:00
xt_TCPOPTSTRIP.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_tcpudp.c netfilter: xtables: change hotdrop pointer to direct modification 2010-05-11 18:35:27 +02:00
xt_TEE.c net: use the macros defined for the members of flowi 2010-11-17 12:27:45 -08:00
xt_time.c netfilter: remove unnecessary returns from void function()s 2010-05-13 15:16:27 +02:00
xt_TPROXY.c netfilter: fix module dependency issues with IPv6 defragmentation, ip6tables and xt_TPROXY 2010-10-25 13:58:36 -07:00
xt_TRACE.c netfilter: xtables: substitute temporary defines by final name 2010-05-11 18:31:17 +02:00
xt_u32.c netfilter: xtables: deconstify struct xt_action_param for matches 2010-05-11 18:33:37 +02:00