linux/include/net
Florian Westphal f330a7fdbe netfilter: conntrack: get rid of conntrack timer
With stats enabled this eats 80 bytes on x86_64 per nf_conn entry, as
Eric Dumazet pointed out during netfilter workshop 2016.

Eric also says: "Another reason was the fact that Thomas was about to
change max timer range [..]" (500462a9de, 'timers: Switch to
a non-cascading wheel').

Remove the timer and use a 32bit jiffies value containing timestamp until
entry is valid.

During conntrack lookup, even before doing tuple comparision, check
the timeout value and evict the entry in case it is too old.

The dying bit is used as a synchronization point to avoid races where
multiple cpus try to evict the same entry.

Because lookup is always lockless, we need to bump the refcnt once
when we evict, else we could try to evict already-dead entry that
is being recycled.

This is the standard/expected way when conntrack entries are destroyed.

Followup patches will introduce garbage colliction via work queue
and further places where we can reap obsoleted entries (e.g. during
netlink dumps), this is needed to avoid expired conntracks from hanging
around for too long when lookup rate is low after a busy period.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-08-30 11:43:09 +02:00
..
9p
bluetooth
caif
irda
iucv
netfilter netfilter: conntrack: get rid of conntrack timer 2016-08-30 11:43:09 +02:00
netns netfilter: remove ip_conntrack* sysctl compat code 2016-08-13 13:27:13 +02:00
nfc
phonet
sctp sctp: change to use TCP_CLOSE_WAIT as SCTP_SS_CLOSING 2016-08-01 13:32:50 -07:00
tc_act net_sched: get rid of struct tcf_common 2016-07-25 21:49:20 -07:00
6lowpan.h
Space.h
act_api.h net_sched: get rid of struct tcf_common 2016-07-25 21:49:20 -07:00
addrconf.h
af_ieee802154.h
af_rxrpc.h rxrpc: Fix races between skb free, ACK generation and replying 2016-08-06 00:08:40 -04:00
af_unix.h
af_vsock.h
ah.h
arp.h
atmclip.h
ax25.h
ax88796.h
bond_3ad.h
bond_alb.h
bond_options.h
bonding.h
busy_poll.h
calipso.h
cfg80211-wext.h
cfg80211.h
cfg802154.h
checksum.h
cipso_ipv4.h
cls_cgroup.h
codel.h
codel_impl.h
codel_qdisc.h
compat.h
datalink.h
dcbevent.h
dcbnl.h
devlink.h
dn.h
dn_dev.h
dn_fib.h
dn_neigh.h
dn_nsp.h
dn_route.h
dsa.h
dsfield.h
dst.h
dst_cache.h
dst_metadata.h
dst_ops.h
esp.h
ethoc.h
fib_rules.h
firewire.h
flow.h
flow_dissector.h
flowcache.h
fou.h
fq.h
fq_impl.h
garp.h
gen_stats.h
genetlink.h
geneve.h
gre.h rps: Inspect PPTP encapsulated by GRE to get flow hash 2016-08-10 17:22:14 -07:00
gro_cells.h
gtp.h
gue.h
hwbm.h
icmp.h
ieee80211_radiotap.h
ieee802154_netdev.h
if_inet6.h
ila.h
inet6_connection_sock.h
inet6_hashtables.h
inet_common.h
inet_connection_sock.h
inet_ecn.h
inet_frag.h
inet_hashtables.h
inet_sock.h
inet_timewait_sock.h
inetpeer.h
ip.h
ip6_checksum.h
ip6_fib.h
ip6_route.h
ip6_tunnel.h
ip_fib.h
ip_tunnels.h
ip_vs.h
ipcomp.h
ipconfig.h
ipv6.h
ipx.h
iw_handler.h
kcm.h
l3mdev.h
lapb.h
lib80211.h
llc.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
lwtunnel.h
mac80211.h mac80211: Add ieee80211_hw pointer to get_expected_throughput 2016-08-05 14:23:25 +02:00
mac802154.h
mip6.h
mld.h
mpls.h
mpls_iptunnel.h
mrp.h
ncsi.h
ndisc.h
neighbour.h
net_namespace.h treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
net_ratelimit.h
netevent.h
netlabel.h
netlink.h
netprio_cgroup.h
netrom.h
nexthop.h
nl802154.h
p8022.h
ping.h
pkt_cls.h
pkt_sched.h net: sched: convert qdisc linked list to hashtable 2016-08-10 17:19:02 -07:00
pptp.h rps: Inspect PPTP encapsulated by GRE to get flow hash 2016-08-10 17:22:14 -07:00
protocol.h
psnap.h
raw.h
rawv6.h
red.h
regulatory.h
request_sock.h
rose.h
route.h
rtnetlink.h
sch_generic.h net: sched: convert qdisc linked list to hashtable 2016-08-10 17:19:02 -07:00
scm.h
secure_seq.h
slhc_vj.h
snmp.h
sock.h
sock_reuseport.h
stp.h
switchdev.h
tcp.h
tcp_states.h
timewait_sock.h
transp_v6.h
tso.h
udp.h
udp_tunnel.h
udplite.h
vsock_addr.h
vxlan.h
wext.h
wimax.h
x25.h
x25device.h
xfrm.h