Kirill Tkhai f0b07bb151 net: Introduce net_rwsem to protect net_namespace_list ...

rtnl_lock() is used everywhere, and contention is very high.
When someone wants to iterate over alive net namespaces,
he/she has no a possibility to do that without exclusive lock.
But the exclusive rtnl_lock() in such places is overkill,
and it just increases the contention. Yes, there is already
for_each_net_rcu() in kernel, but it requires rcu_read_lock(),
and this can't be sleepable. Also, sometimes it may be need
really prevent net_namespace_list growth, so for_each_net_rcu()
is not fit there.

This patch introduces new rw_semaphore, which will be used
instead of rtnl_mutex to protect net_namespace_list. It is
sleepable and allows not-exclusive iterations over net
namespaces list. It allows to stop using rtnl_lock()
in several places (what is made in next patches) and makes
less the time, we keep rtnl_mutex. Here we just add new lock,
while the explanation of we can remove rtnl_lock() there are
in next patches.

Fine grained locks generally are better, then one big lock,
so let's do that with net_namespace_list, while the situation
allows that.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2018-03-29 13:47:53 -04:00

..

ipset

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

ipvs

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

core.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

Kconfig

netfilter: flowtable infrastructure depends on NETFILTER_INGRESS

2018-02-02 13:21:48 +01:00

Makefile

netfilter: nf_tables: flow offload expression

2018-01-08 18:11:10 +01:00

nf_conncount.c

netfilter: return booleans instead of integers

2018-01-19 14:02:18 +01:00

nf_conntrack_acct.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_conntrack_amanda.c

netfilter: use nf_conntrack_helpers_register when possible

2017-06-19 19:13:21 +02:00

nf_conntrack_broadcast.c

netfilter: Remove duplicated rcu_read_lock.

2017-07-24 13:24:46 +02:00

nf_conntrack_core.c

net: Introduce net_rwsem to protect net_namespace_list

2018-03-29 13:47:53 -04:00

nf_conntrack_ecache.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_conntrack_expect.c

netfilter: delete /proc THIS_MODULE references

2018-01-19 14:10:53 +01:00

nf_conntrack_extend.c

net: Replace NF_CT_ASSERT() with WARN_ON().

2017-09-04 13:25:19 +02:00

nf_conntrack_ftp.c

netfilter: helpers: remove data_len usage for inkernel helpers

2017-04-19 17:55:17 +02:00

nf_conntrack_h323_asn1.c

netfilter: nf_conntrack_h323: Remove unwanted comments.

2018-01-08 18:01:05 +01:00

nf_conntrack_h323_main.c

netfilter: move route indirection to struct nf_ipv6_ops

2018-01-08 18:01:26 +01:00

nf_conntrack_h323_types.c

…

nf_conntrack_helper.c

netfilter: expect: add and use nf_ct_expect_iterate helpers

2017-07-31 19:09:38 +02:00

nf_conntrack_irc.c

netfilter: helpers: remove data_len usage for inkernel helpers

2017-04-19 17:55:17 +02:00

nf_conntrack_l3proto_generic.c

netfilter: conntrack: place print_tuple in procfs part

2017-08-24 18:52:32 +02:00

nf_conntrack_labels.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_conntrack_netbios_ns.c

net: Use octal not symbolic permissions

2018-03-26 12:07:48 -04:00

nf_conntrack_netlink.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_conntrack_pptp.c

netfilter: Remove duplicated rcu_read_lock.

2017-07-24 13:24:46 +02:00

nf_conntrack_proto_dccp.c

netfilter: conntrack: l4 protocol trackers can be const

2018-01-08 18:00:54 +01:00

nf_conntrack_proto_generic.c

netfilter: conntrack: timeouts can be const

2018-01-08 18:01:02 +01:00

nf_conntrack_proto_gre.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_conntrack_proto_sctp.c

netfilter: conntrack: timeouts can be const

2018-01-08 18:01:02 +01:00

nf_conntrack_proto_tcp.c

netfilter: nf_conntrack: add IPS_OFFLOAD status bit

2018-01-08 18:11:05 +01:00

nf_conntrack_proto_udp.c

netfilter: conntrack: timeouts can be const

2018-01-08 18:01:02 +01:00

nf_conntrack_proto.c

netfilter: conntrack: constify list of builtin trackers

2018-01-08 16:47:14 +01:00

nf_conntrack_sane.c

netfilter: helpers: remove data_len usage for inkernel helpers

2017-04-19 17:55:17 +02:00

nf_conntrack_seqadj.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_conntrack_sip.c

netfilter: Remove duplicated rcu_read_lock.

2017-07-24 13:24:46 +02:00

nf_conntrack_snmp.c

net: Use octal not symbolic permissions

2018-03-26 12:07:48 -04:00

nf_conntrack_standalone.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_conntrack_tftp.c

netfilter: helpers: remove data_len usage for inkernel helpers

2017-04-19 17:55:17 +02:00

nf_conntrack_timeout.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_conntrack_timestamp.c

netfilter: conntrack: mark extension structs as const

2017-04-26 09:30:22 +02:00

nf_dup_netdev.c

netfilter: dup: resolve warnings about missing prototypes

2017-05-29 11:32:36 +02:00

nf_flow_table_inet.c

netfilter: nf_tables: fix flowtable free

2018-02-07 00:58:57 +01:00

nf_flow_table.c

netfilter: nf_flow_offload: fix use-after-free and a resource leak

2018-02-07 11:55:52 +01:00

nf_internals.h

netfilter: core: remove synchronize_net call if nfqueue is used

2018-01-08 18:01:06 +01:00

nf_log_common.c

netfilter: nf_log: do not assume ethernet header in netdev family

2016-12-04 20:45:33 +01:00

nf_log_netdev.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_log.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_nat_amanda.c

netfilter: nat: nf_nat_mangle_{udp,tcp}_packet returns boolean

2017-04-06 22:01:38 +02:00

nf_nat_core.c

netfilter: nat: use test_and_clear_bit when deleting ct from bysource list

2017-10-24 17:54:47 +02:00

nf_nat_ftp.c

treewide: Fix function prototypes for module_param_call()

2017-10-31 15:30:37 +01:00

nf_nat_helper.c

netfilter: nat: nf_nat_mangle_{udp,tcp}_packet returns boolean

2017-04-06 22:01:38 +02:00

nf_nat_irc.c

treewide: Fix function prototypes for module_param_call()

2017-10-31 15:30:37 +01:00

nf_nat_proto_common.c

netfilter: nat: cope with negative port range

2018-02-14 21:05:40 +01:00

nf_nat_proto_dccp.c

netfilter: built-in NAT support for DCCP

2016-12-04 20:45:30 +01:00

nf_nat_proto_sctp.c

sctp: remove the typedef sctp_sctphdr_t

2017-07-01 09:08:41 -07:00

nf_nat_proto_tcp.c

net: Change pseudohdr argument of inet_proto_csum_replace* to be a bool

2015-08-17 21:33:06 -07:00

nf_nat_proto_udp.c

netfilter: nat: merge udp and udplite helpers

2017-01-03 14:33:25 +01:00

nf_nat_proto_unknown.c

…

nf_nat_redirect.c

net: Replace NF_CT_ASSERT() with WARN_ON().

2017-09-04 13:25:19 +02:00

nf_nat_sip.c

…

nf_nat_tftp.c

…

nf_queue.c

netfilter: remove duplicated include

2018-01-10 15:32:15 +01:00

nf_sockopt.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

nf_synproxy_core.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_tables_api.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nf_tables_core.c

netfilter: constify nf_loginfo structures

2017-08-02 14:25:59 +02:00

nf_tables_inet.c

netfilter: nf_tables: get rid of struct nft_af_info abstraction

2018-01-10 15:32:11 +01:00

nf_tables_netdev.c

netfilter: nf_tables: get rid of struct nft_af_info abstraction

2018-01-10 15:32:11 +01:00

nf_tables_trace.c

netfilter: nf_tables: Allow chain name of up to 255 chars

2017-07-31 20:41:57 +02:00

nfnetlink_acct.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nfnetlink_cthelper.c

netfilter: nfnetlink_cthelper: Add missing permission checks

2017-12-04 11:30:09 +01:00

nfnetlink_cttimeout.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nfnetlink_log.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nfnetlink_queue.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nfnetlink.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

nft_bitwise.c

netfilter: nf_tables: revisit chain/object refcounting from elements

2017-05-15 12:51:41 +02:00

nft_byteorder.c

netfilter: nf_tables: simplify the basic expressions' init routine

2016-11-09 23:42:23 +01:00

nft_cmp.c

netfilter: mark expected switch fall-throughs

2018-01-08 18:01:01 +01:00

nft_compat.c

netfilter: remove messages print and boot/module load time

2018-01-19 18:39:49 +01:00

nft_counter.c

netfilter: nf_tables: add select_ops for stateful objects

2017-09-04 13:25:09 +02:00

nft_ct.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_dup_netdev.c

netfilter: nf_tables: add packet duplication to the netdev family

2016-01-03 21:04:23 +01:00

nft_dynset.c

netfilter: nf_tables: Fix trailing semicolon

2018-01-19 14:10:04 +01:00

nft_exthdr.c

netfilter: exthdr: add missign attributes to policy

2017-12-11 13:46:04 +01:00

nft_fib_inet.c

netfilter: nf_tables: use hook state from xt_action_param structure

2016-11-03 11:52:34 +01:00

nft_fib_netdev.c

netfilter: nf_tables: add fib expression to the netdev family

2017-07-31 19:01:40 +02:00

nft_fib.c

netfilter: nft_fib: Support existence check

2017-03-13 13:45:36 +01:00

nft_flow_offload.c

netfilter: nft_flow_offload: move flowtable cleanup routines to nf_flow_table

2018-02-07 00:58:57 +01:00

nft_fwd_netdev.c

netfilter: add and use nf_fwd_netdev_egress

2016-12-06 21:48:22 +01:00

nft_hash.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

2017-05-01 10:47:53 -04:00

nft_immediate.c

netfilter: nf_tables: revisit chain/object refcounting from elements

2017-05-15 12:51:41 +02:00

nft_limit.c

netfilter: nft_limit: add stateful object type

2017-09-04 13:25:16 +02:00

nft_log.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_lookup.c

netfilter: nf_tables: add nft_set_lookup()

2017-03-06 18:23:23 +01:00

nft_masq.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_meta.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_nat.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_numgen.c

netfilter: Remove exceptional & on function name

2017-04-07 18:24:47 +02:00

nft_objref.c

netfilter: nf_tables: add select_ops for stateful objects

2017-09-04 13:25:09 +02:00

nft_payload.c

netfilter: fix a few (harmless) sparse warnings

2017-08-28 17:42:56 +02:00

nft_queue.c

netfilter: Remove exceptional & on function name

2017-04-07 18:24:47 +02:00

nft_quota.c

netfilter: nf_tables: add select_ops for stateful objects

2017-09-04 13:25:09 +02:00

nft_range.c

netfilter: nf_tables: revisit chain/object refcounting from elements

2017-05-15 12:51:41 +02:00

nft_redir.c

netfilter: nf_tables: add single table list for all families

2018-01-10 15:32:08 +01:00

nft_reject_inet.c

netfilter: nf_tables: validate the expr explicitly after init successfully

2017-03-06 18:22:12 +01:00

nft_reject.c

netfilter: nf_tables: validate the expr explicitly after init successfully

2017-03-06 18:22:12 +01:00

nft_rt.c

netfilter: move route indirection to struct nf_ipv6_ops

2018-01-08 18:01:26 +01:00

nft_set_bitmap.c

netfilter: nf_tables: get set elements via netlink

2017-11-07 01:00:31 +01:00

nft_set_hash.c

netfilter: nft_set_hash: skip fixed hash if timeout is specified

2018-03-06 12:23:33 +01:00

nft_set_rbtree.c

netfilter: nf_tables: get set elements via netlink

2017-11-07 01:00:31 +01:00

utils.c

netfilter: move reroute indirection to struct nf_ipv6_ops

2018-01-08 18:10:53 +01:00

x_tables.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

xt_addrtype.c

netfilter: x_tables: use pr ratelimiting in matches/targets

2018-02-14 21:05:37 +01:00

xt_AUDIT.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_bpf.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_cgroup.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_CHECKSUM.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_CLASSIFY.c

…

xt_cluster.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_comment.c

…

xt_connbytes.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_connlabel.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_connlimit.c

netfilter: connlimit: split xt_connlimit into front and backend

2018-01-08 18:01:22 +01:00

xt_connmark.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_CONNSECMARK.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_conntrack.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_cpu.c

…

xt_CT.c

netfilter: xt_CT: use pr ratelimiting

2018-02-14 21:05:34 +01:00

xt_dccp.c

…

xt_devgroup.c

netfilter: x_tables: move hook state into xt_action_param structure

2016-11-03 10:56:21 +01:00

xt_dscp.c

netfilter: x_tables: remove pr_info where possible

2018-02-14 21:05:33 +01:00

xt_DSCP.c

netfilter: x_tables: remove pr_info where possible

2018-02-14 21:05:33 +01:00

xt_ecn.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_esp.c

…

xt_hashlimit.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

xt_helper.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_hl.c

…

xt_HL.c

netfilter: x_tables: remove pr_info where possible

2018-02-14 21:05:33 +01:00

xt_HMARK.c

netfilter: x_tables: use pr ratelimiting in matches/targets

2018-02-14 21:05:37 +01:00

xt_IDLETIMER.c

net: Use octal not symbolic permissions

2018-03-26 12:07:48 -04:00

xt_ipcomp.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_iprange.c

…

xt_ipvs.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_l2tp.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_LED.c

netfilter: x_tables: fix missing timer initialization in xt_LED

2018-02-14 21:05:39 +01:00

xt_length.c

…

xt_limit.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_LOG.c

netfilter: x_tables: move hook state into xt_action_param structure

2016-11-03 10:56:21 +01:00

xt_mac.c

…

xt_mark.c

…

xt_multiport.c

netfilter: xt_multiport: Fix wrong unmatch result with multiple ports

2016-12-06 21:48:20 +01:00

xt_nat.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_NETMAP.c

net: Replace NF_CT_ASSERT() with WARN_ON().

2017-09-04 13:25:19 +02:00

xt_nfacct.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_NFLOG.c

netfilter: x_tables: move hook state into xt_action_param structure

2016-11-03 10:56:21 +01:00

xt_NFQUEUE.c

netfilter: xt_NFQUEUE: use pr ratelimiting

2018-02-14 21:05:35 +01:00

xt_osf.c

netfilter: xt_osf: Add missing permission checks

2017-12-06 09:01:18 +01:00

xt_owner.c

sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>

2017-03-02 08:42:31 +01:00

xt_physdev.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_pkttype.c

netfilter: pkttype: unnecessary to check ipv6 multicast address

2017-01-18 20:32:43 +01:00

xt_policy.c

netfilter: x_tables: use pr ratelimiting in matches/targets

2018-02-14 21:05:37 +01:00

xt_quota.c

xtables: extend matches and targets with .usersize

2017-01-09 17:24:55 +01:00

xt_rateest.c

xtables: extend matches and targets with .usersize

2017-01-09 17:24:55 +01:00

xt_RATEEST.c

netfilter: xt_RATEEST: acquire xt_rateest_mutex for hash insert

2018-02-07 00:58:57 +01:00

xt_realm.c

…

xt_recent.c

net: Drop pernet_operations::async

2018-03-27 13:18:09 -04:00

xt_REDIRECT.c

netfilter: nat: add dependencies on conntrack module

2016-12-04 21:16:51 +01:00

xt_repldata.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

xt_sctp.c

sctp: remove the typedef sctp_chunkhdr_t

2017-07-01 09:08:41 -07:00

xt_SECMARK.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_set.c

netfilter: xt_set: use pr ratelimiting

2018-02-14 21:05:35 +01:00

xt_socket.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_state.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_statistic.c

netfilter: x_tables: fix pointer leaks to userspace

2018-01-31 14:59:24 +01:00

xt_string.c

xtables: extend matches and targets with .usersize

2017-01-09 17:24:55 +01:00

xt_tcpmss.c

…

xt_TCPMSS.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_TCPOPTSTRIP.c

net: Change pseudohdr argument of inet_proto_csum_replace* to be a bool

2015-08-17 21:33:06 -07:00

xt_tcpudp.c

netfilter: Convert FWINV<[foo]> macros and uses to NF_INVF

2016-07-03 10:55:07 +02:00

xt_TEE.c

xtables: extend matches and targets with .usersize

2017-01-09 17:24:55 +01:00

xt_time.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_TPROXY.c

netfilter: x_tables: use pr ratelimiting in all remaining spots

2018-02-14 21:05:38 +01:00

xt_TRACE.c

netfilter: xt_TRACE: add explicitly nf_logger_find_get call

2016-06-23 13:26:49 +02:00

xt_u32.c

…