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Eric Dumazet 682a1e0ecb ipv4: avoid quadratic behavior in netns dismantle 
commit d07418afea upstream.

net/ipv4/fib_semantics.c uses an hash table of 256 slots,
keyed by device ifindexes: fib_info_devhash[DEVINDEX_HASHSIZE]

Problem is that with network namespaces, devices tend
to use the same ifindex.

lo device for instance has a fixed ifindex of one,
for all network namespaces.

This means that hosts with thousands of netns spend
a lot of time looking at some hash buckets with thousands
of elements, notably at netns dismantle.

Simply add a per netns perturbation (net_hash_mix())
to spread elements more uniformely.

Also change fib_devindex_hashfn() to use more entropy.

Fixes: aa79e66eee ("net: Make ifindex generation per-net namespace")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-27 09:19:53 +01:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-09-15 09:47:31 +02:00
9p 9p/net: fix missing error check in p9_check_errors 2021-11-17 09:48:49 +01:00
802 net/802/garp: fix memleak in garp_request_join() 2021-07-31 08:19:38 +02:00
8021q net: vlan: fix underflow for the real_dev refcnt 2021-12-01 09:23:34 +01:00
appletalk appletalk: Fix skb allocation size in loopback case 2021-04-07 14:47:41 +02:00
atm atm: fix a memory leak of vcc->user_back 2020-10-01 13:17:58 +02:00
ax25 ax25: NPD bug when detaching AX25 device 2021-12-29 12:23:38 +01:00
batman-adv batman-adv: allow netlink usage in unprivileged containers 2022-01-27 09:19:41 +01:00
bluetooth Bluetooth: Fix debugfs entry leak in hci_register_dev() 2022-01-27 09:19:40 +01:00
bpf
bpfilter bpfilter: Specify the log level for the kmsg message 2021-07-14 16:53:33 +02:00
bridge netfilter: bridge: add support for pppoe filtering 2022-01-27 09:19:31 +01:00
caif net-caif: avoid user-triggerable WARN_ON(1) 2021-09-22 12:26:40 +02:00
can can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM 2021-12-08 09:01:08 +01:00
ceph libceph: clear con->out_msg on Policy::stateful_server faults 2020-11-05 11:43:34 +01:00
core bpf: Do not WARN in bpf_warn_invalid_xdp_action() 2022-01-27 09:19:43 +01:00
dcb net: dcb: Accept RTM_GETDCB messages carrying set-like DCB commands 2021-01-23 15:57:59 +01:00
dccp dccp: don't duplicate ccid when cloning dccp sock 2021-09-22 12:26:40 +02:00
decnet net: decnet: Fix sleeping inside in af_decnet 2021-07-28 13:30:56 +02:00
dns_resolver
dsa net: dsa: destroy the phylink instance on any error in dsa_slave_phy_setup 2021-09-22 12:26:42 +02:00
ethernet
hsr hsr: use netdev_err() instead of WARN_ONCE() 2021-05-14 09:44:10 +02:00
ieee802154 net: Fix memory leak in ieee802154_raw_deliver 2021-08-18 08:57:00 +02:00
ife
ipv4 ipv4: avoid quadratic behavior in netns dismantle 2022-01-27 09:19:53 +01:00
ipv6 xfrm: fix policy lookup for ipv6 gre packets 2022-01-27 09:19:50 +01:00
iucv net/af_iucv: remove WARN_ONCE on malformed RX packets 2021-03-07 12:20:42 +01:00
kcm
key af_key: relax availability checks for skb size calculation 2021-02-13 13:52:54 +01:00
l2tp net/l2tp: Fix reference count leak in l2tp_udp_recv_core 2021-09-22 12:26:41 +02:00
l3mdev
lapb net: lapb: Copy the skb before sending a packet 2021-02-10 09:25:28 +01:00
llc net: llc: fix skb_over_panic 2021-08-04 12:27:39 +02:00
mac80211 mac80211: allow non-standard VHT MCS-10/11 2022-01-27 09:19:46 +01:00
mac802154 net: mac802154: Fix general protection fault 2021-04-14 08:24:18 +02:00
mpls net: mpls: Fix notifications when deleting a device 2021-12-08 09:01:12 +01:00
ncsi net/ncsi: check for error return from call to nla_put_u32 2022-01-05 12:37:45 +01:00
netfilter netfilter: fix regression in looped (broad|multi)cast's MAC handling 2021-12-29 12:23:34 +01:00
netlabel net: fix NULL pointer reference in cipso_v4_doi_free 2021-09-22 12:26:36 +02:00
netlink net: netlink: af_netlink: Prevent empty skb by adding a check on len. 2021-12-17 10:12:23 +01:00
netrom netrom: Decrease sock refcount when sock timers expire 2021-07-28 13:30:56 +02:00
nfc nfc: llcp: fix NULL error pointer dereference on sendmsg() after failed bind() 2022-01-27 09:19:26 +01:00
nsh
openvswitch ovs: clear skb->tstamp in forwarding path 2021-08-26 08:36:19 -04:00
packet net/packet: rx_owner_map depends on pg_vec 2021-12-22 09:29:38 +01:00
phonet phonet: refcount leak in pep_sock_accep 2022-01-11 15:23:33 +01:00
psample
qrtr net: qrtr: fix another OOB Read in qrtr_endpoint_post 2021-09-03 10:08:12 +02:00
rds rds: memory leak in __rds_conn_create() 2021-12-22 09:29:37 +01:00
rfkill rfkill: Fix use-after-free in rfkill_resume() 2020-11-24 13:29:05 +01:00
rose rose: Fix Null pointer dereference in rose_send_frame() 2020-12-08 10:40:23 +01:00
rxrpc rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-12-08 09:01:12 +01:00
sched sch_qfq: prevent shift-out-of-bounds in qfq_init_qdisc 2022-01-11 15:23:32 +01:00
sctp sctp: use call_rcu to free endpoint 2022-01-05 12:37:44 +01:00
smc net/smc: Prevent smc_release() from long blocking 2021-12-22 09:29:38 +01:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-17 09:48:48 +01:00
sunrpc SUNRPC: Partial revert of commit 6f9f17287e 2021-11-17 09:48:50 +01:00
switchdev net: switchdev: do not propagate bridge updates across bridges 2021-10-27 09:54:24 +02:00
tipc tipc: increase timeout in tipc_sk_enqueue() 2021-09-22 12:26:41 +02:00
tls net/tls: Fix authentication failure in CCM mode 2021-12-08 09:01:14 +01:00
unix af_unix: fix races in sk_peer_pid and sk_peer_cred accesses 2021-10-06 15:42:35 +02:00
vmw_vsock vsock: prevent unnecessary refcnt inc for nonblocking connect 2021-11-17 09:48:48 +01:00
wimax
wireless cfg80211: call cfg80211_stop_ap when switch from P2P_GO type 2021-11-26 10:47:22 +01:00
x25 net/x25: Return the correct errno code 2021-06-18 09:59:00 +02:00
xdp Revert "xsk: Do not sleep in poll() when need_wakeup set" 2021-12-22 09:29:40 +01:00
xfrm xfrm: fix policy lookup for ipv6 gre packets 2022-01-27 09:19:50 +01:00
compat.c net: Return the correct errno code 2021-06-18 09:59:00 +02:00
Kconfig
Makefile
socket.c net: don't unconditionally copy_from_user a struct ifreq for socket ioctls 2021-09-03 10:08:16 +02:00
sysctl_net.c