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Pablo Neira Ayuso 67cc570eda netfilter: nf_tables: coalesce multiple notifications into one skbuff 
On x86_64, each notification results in one skbuff allocation which
consumes at least 768 bytes due to the skbuff overhead.

This patch coalesces several notifications into one single skbuff, so
each notification consumes at least ~211 bytes, that ~3.5 times less
memory consumption. As a result, this is reducing the chances to exhaust
the netlink socket receive buffer.

Rule of thumb is that each notification batch only contains netlink
messages whose report flag is the same, nfnetlink_send() requires this
to do appropriate delivery to userspace, either via unicast (echo
mode) or multicast (monitor mode).

The skbuff control buffer is used to annotate the report flag for later
handling at the new coalescing routine.

The batch skbuff notification size is NLMSG_GOODSIZE, using a larger
skbuff would allow for more socket receiver buffer savings (to amortize
the cost of the skbuff even more), however, going over that size might
break userspace applications, so let's be conservative and stick to
NLMSG_GOODSIZE.

Reported-by: Phil Sutter <phil@nwl.cc>
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-09-08 13:02:44 +02:00
..
6lowpan
9p treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
802
8021q treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
appletalk appletalk: Fix atalk_proc_init() return path 2020-08-03 15:48:32 -07:00
atm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
batman-adv batman-adv: bla: use netif_rx_ni when not in interrupt context 2020-08-18 19:40:03 +02:00
bluetooth mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
bpf treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bpfilter Merge branch 'exec-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2020-08-04 14:27:25 -07:00
bridge netfilter: ebtables: reject bogus getopt len value 2020-08-14 11:59:08 +02:00
caif net: caif: fix error code handling 2020-08-25 07:50:25 -07:00
can treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ceph treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
core Revert "netns: don't disable BHs when locking "nsid_lock"" 2020-09-07 14:32:39 -07:00
dcb
dccp treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
decnet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
dns_resolver
dsa treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ethernet
ethtool ethtool: Don't omit the netlink reply if no features were changed 2020-08-18 16:00:24 -07:00
hsr hsr: Use %pM format specifier for MAC addresses 2020-07-31 16:46:26 -07:00
ieee802154 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ife
ipv4 netfilter: delete repeated words 2020-08-28 20:11:38 +02:00
ipv6 ipv6: Fix sysctl max for fib_multipath_hash_policy 2020-09-02 15:44:53 -07:00
iucv treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
kcm net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
l2tp l2tp: improve API documentation in l2tp_core.h 2020-07-30 16:45:31 -07:00
l3mdev net: Fix some comments 2020-08-27 07:55:59 -07:00
lapb
llc net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
mac80211 mac80211: reduce packet loss event false positives 2020-08-27 10:53:20 +02:00
mac802154 mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
mpls treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mptcp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
ncsi treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
netfilter netfilter: nf_tables: coalesce multiple notifications into one skbuff 2020-09-08 13:02:44 +02:00
netlabel netlabel: fix problems with mapping removal 2020-08-24 16:08:00 -07:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
netrom treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfc net/nfc/rawsock.c: add CAP_NET_RAW check. 2020-08-11 10:34:30 -07:00
nsh
openvswitch treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
packet net/packet: fix overflow in tpacket_rcv 2020-09-04 11:56:02 -07:00
phonet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
psample
qrtr net: qrtr: fix usage of idr in port assignment to socket 2020-08-17 15:00:41 -07:00
rds treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rfkill
rose treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
sched act_ife: load meta modules before tcf_idr_check_alloc() 2020-09-04 22:08:59 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
smc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
strparser
sunrpc Fixes: 2020-08-25 18:01:36 -07:00
switchdev net: switchdev: kerneldoc fixes 2020-07-13 17:20:40 -07:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
tls net/tls: Fix kmap usage 2020-08-11 10:20:34 -07:00
unix treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
vmw_vsock vsock: fix potential null pointer dereference in vsock_poll() 2020-08-12 12:56:06 -07:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
x25 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
xdp xdp: Prevent kernel-infoleak in xsk_getsockopt() 2020-07-28 12:50:15 +02:00
xfrm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
compat.c net/scm: Fix typo in SCM_RIGHTS compat refactoring 2020-08-07 12:43:25 -07:00
devres.c net: devres: rename the release callback of devm_register_netdev() 2020-06-30 15:57:34 -07:00
Kconfig net: ethtool: Remove PHYLIB direct dependency 2020-07-07 15:41:05 -07:00
Makefile
socket.c net: Fix some comments 2020-08-27 07:55:59 -07:00
sysctl_net.c