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Eric Dumazet 79134e6ce2 net: do not create fallback tunnels for non-default namespaces 
fallback tunnels (like tunl0, gre0, gretap0, erspan0, sit0,
ip6tnl0, ip6gre0) are automatically created when the corresponding
module is loaded.

These tunnels are also automatically created when a new network
namespace is created, at a great cost.

In many cases, netns are used for isolation purposes, and these
extra network devices are a waste of resources. We are using
thousands of netns per host, and hit the netns creation/delete
bottleneck a lot. (Many thanks to Kirill for recent work on this)

Add a new sysctl so that we can opt-out from this automatic creation.

Note that these tunnels are still created for the initial namespace,
to be the least intrusive for typical setups.

Tested:
lpk43:~# cat add_del_unshare.sh
for i in `seq 1 40`
do
 (for j in `seq 1 100` ; do  unshare -n /bin/true >/dev/null ; done) &
done
wait

lpk43:~# echo 0 >/proc/sys/net/core/fb_tunnels_only_for_init_net
lpk43:~# time ./add_del_unshare.sh

real	0m37.521s
user	0m0.886s
sys	7m7.084s
lpk43:~# echo 1 >/proc/sys/net/core/fb_tunnels_only_for_init_net
lpk43:~# time ./add_del_unshare.sh

real	0m4.761s
user	0m0.851s
sys	1m8.343s
lpk43:~#

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-03-09 11:23:11 -05:00
..
6lowpan License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
9p virtio: bugfixes 2018-02-15 14:29:27 -08:00
802 treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
8021q net: Convert /proc creating and destroying pernet_operations 2018-02-27 11:01:35 -05:00
appletalk net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
atm net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
ax25 net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2018-02-15 15:43:49 -05:00
bpf bpf: fix null pointer deref in bpf_prog_test_run_xdp 2018-02-01 07:43:56 -08:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
caif net: Convert caif_net_ops 2018-03-05 10:48:27 -05:00
can net: Convert cangw_pernet_ops 2018-03-05 10:48:27 -05:00
ceph libceph, ceph: avoid memory leak when specifying same option several times 2018-02-26 16:19:30 +01:00
core net: do not create fallback tunnels for non-default namespaces 2018-03-09 11:23:11 -05:00
dcb rtnetlink: make rtnl_register accept a flags parameter 2017-08-09 16:57:38 -07:00
dccp net: Convert dccp_v6_ops 2018-03-05 10:48:28 -05:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
dns_resolver afs: Support the AFS dynamic root 2018-02-06 14:43:37 +00:00
dsa dsa: Pass the port to get_sset_count() 2018-03-04 13:34:18 -05:00
ethernet networking: make skb_push & __skb_push return void pointers 2017-06-16 11:48:40 -04:00
hsr net: hsr: Convert timers to use timer_setup() 2017-10-25 13:00:27 +09:00
ieee802154 Merge branch 'ieee802154-for-davem-2018-02-26' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next 2018-02-27 11:14:57 -05:00
ife MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
ipv4 net: do not create fallback tunnels for non-default namespaces 2018-03-09 11:23:11 -05:00
ipv6 net: do not create fallback tunnels for non-default namespaces 2018-03-09 11:23:11 -05:00
iucv net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
kcm net: Convert simple pernet_operations 2018-02-27 11:01:35 -05:00
key net: Convert /proc creating and destroying pernet_operations 2018-02-27 11:01:35 -05:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
l3mdev
…
lapb treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
llc net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
mpls net: rename skb_gso_validate_mtu -> skb_gso_validate_network_len 2018-03-04 17:49:17 -05:00
ncsi net/ncsi: unlock on error in ncsi_set_interface_nl() 2018-03-08 21:49:58 -05:00
netfilter net: Convert nfnl_queue_net_ops 2018-03-08 12:36:44 -05:00
netlabel net/netlabel: Add list_next_rcu() in rcu_dereference(). 2017-11-18 10:32:41 +09:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-24 00:04:20 -05:00
netrom net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
nsh openvswitch: enable NSH support 2017-11-08 16:12:33 +09:00
openvswitch openvswitch: fix vport packet length check. 2018-03-08 12:50:29 -05:00
packet net: Convert packet_net_ops 2018-02-13 10:36:08 -05:00
phonet net: Convert /proc creating and destroying pernet_operations 2018-02-27 11:01:35 -05:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
rds rds: rds_info_from_znotifier() can be static 2018-03-08 21:54:00 -05:00
rfkill vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rose net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
rxrpc rxrpc: Fix send in rxrpc_send_data_packet() 2018-02-22 15:37:47 -05:00
sched net/sched: cls_flower: Add support to handle first frag as match field 2018-03-08 12:16:29 -05:00
sctp sctp: add support for snd flag SCTP_SENDALL process in sendmsg 2018-03-07 10:55:29 -05:00
smc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
strparser strparser: Call sock_owned_by_user_nocheck 2017-12-28 14:28:22 -05:00
sunrpc net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
switchdev net: bridge: Add/del switchdev object on host join/leave 2017-11-10 13:41:40 +09:00
tipc tipc: bcast: use true and false for boolean values 2018-03-07 12:18:00 -05:00
tls tls: Use correct sk->sk_prot for IPV6 2018-02-27 14:41:48 -05:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
vmw_vsock net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-06 01:20:46 -05:00
x25 x25: use %*ph to print small buffer 2018-02-20 13:51:47 -05:00
xfrm net: Convert xfrm_user_net_ops 2018-03-08 12:36:43 -05:00
Kconfig Staging/IIO patches for 4.16-rc1 2018-02-01 09:51:57 -08:00
Makefile ipx: move Novell IPX protocol support into staging 2017-11-28 13:55:00 +01:00
compat.c net: compat: assert the size of cmsg copied in is as expected 2017-09-20 15:36:18 -07:00
socket.c socket: skip checking sk_err for recvmmsg(MSG_ERRQUEUE) 2018-03-01 21:27:49 -05:00
sysctl_net.c net: Convert sysctl_pernet_ops 2018-02-13 10:36:05 -05:00