Jakub Kicinski a8585fdf42 net: ip: avoid OOM kills with large UDP sends over loopback ... [ Upstream commit 6d123b81ac ] Dave observed number of machines hitting OOM on the UDP send path. The workload seems to be sending large UDP packets over loopback. Since loopback has MTU of 64k kernel will try to allocate an skb with up to 64k of head space. This has a good chance of failing under memory pressure. What's worse if the message length is <32k the allocation may trigger an OOM killer. This is entirely avoidable, we can use an skb with page frags. af_unix solves a similar problem by limiting the head length to SKB_MAX_ALLOC. This seems like a good and simple approach. It means that UDP messages > 16kB will now use fragments if underlying device supports SG, if extra allocator pressure causes regressions in real workloads we can switch to trying the large allocation first and falling back. v4: pre-calculate all the additions to alloclen so we can be sure it won't go over order-2 Reported-by: Dave Jones <dsj@fb.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-07-19 09:44:53 +02:00
..
bpfilter	net: Revert "net: optimize the sockptr_t for unified kernel/user address spaces"	2020-08-10 12:06:44 -07:00
netfilter	netfilter: arp_tables: add pre_exit hook for table unregister	2021-04-21 13:00:56 +02:00
af_inet.c	inet: annotate data race in inet_send_prepare() and inet_dgram_connect()	2021-06-30 08:47:20 -04:00
ah4.c	xfrm: Use actual socket sk instead of skb socket for xfrm_output_resume	2021-04-14 08:42:05 +02:00
arp.c	net: Exempt multicast addresses from five-second neighbor lifetime	2020-11-13 14:24:39 -08:00
bpf_tcp_ca.c	bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON	2020-09-25 13:58:01 -07:00
cipso_ipv4.c	net: ipv4: fix memory leak in netlbl_cipsov4_add_std	2021-06-23 14:42:41 +02:00
datagram.c	inet: stop leaking jiffies on the wire	2019-11-01 14:57:52 -07:00
devinet.c	net: ipv4: Remove unneed BUG() function	2021-06-30 08:47:20 -04:00
esp4_offload.c	xfrm: Provide private skb extensions for segmented and hw offloaded ESP packets	2021-04-14 08:42:07 +02:00
esp4.c	xfrm: xfrm_state_mtu should return at least 1280 for ipv6	2021-07-14 16:56:14 +02:00
fib_frontend.c	net/ipv4: swap flow ports when validating source	2021-07-14 16:56:25 +02:00
fib_lookup.h	net: add net available in build_state	2020-03-29 22:30:57 -07:00
fib_notifier.c	net: fib_notifier: propagate extack down to the notifier block callback	2019-10-04 11:10:56 -07:00
fib_rules.c	fib: use indirect call wrappers in the most common fib_rules_ops	2020-07-28 17:42:31 -07:00
fib_semantics.c	net: Fix the arp error in some cases	2020-06-18 20:21:51 -07:00
fib_trie.c	ipv4: Silence suspicious RCU usage warning	2020-08-26 15:58:48 -07:00
fou.c	genetlink: move to smaller ops wherever possible	2020-10-02 19:11:11 -07:00
gre_demux.c	erspan: fix version 1 check in gre_parse_header()	2021-01-12 20:18:12 +01:00
gre_offload.c	net: gre: recompute gre csum for sctp over gre tunnels	2020-08-03 15:29:44 -07:00
icmp.c	icmp: don't send out ICMP messages with a source address of 0.0.0.0	2021-06-23 14:42:47 +02:00
igmp.c	net: ipv4: fix memory leak in ip_mc_add1_src	2021-06-23 14:42:46 +02:00
inet_connection_sock.c	tcp: relookup sock for RST+ACK packets handled by obsolete req sock	2021-03-30 14:31:59 +02:00
inet_diag.c	inet_diag: Fix error path to cancel the meseage in inet_req_diag_fill()	2020-11-17 16:08:36 -08:00
inet_fragment.c	inet: frags: re-introduce skb coalescing for local delivery	2019-08-08 15:55:10 -07:00
inet_hashtables.c	tcp: fix race condition when creating child sockets from syncookies	2020-11-23 16:32:33 -08:00
inet_timewait_sock.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
inetpeer.c	inetpeer: fix data-race in inet_putpeer / inet_putpeer	2019-11-07 16:15:56 -08:00
ip_forward.c	ipv4: Revert removal of rt_uses_gateway	2019-09-20 18:23:33 -07:00
ip_fragment.c	inet: frags: re-introduce skb coalescing for local delivery	2019-08-08 15:55:10 -07:00
ip_gre.c	ip_gre: set dev->hard_header_len and dev->needed_headroom properly	2020-10-13 18:35:29 -07:00
ip_input.c	bpf: Add socket assign support	2020-03-30 13:45:04 -07:00
ip_options.c	net: clean up codestyle for net/ipv4	2020-08-25 06:28:02 -07:00
ip_output.c	net: ip: avoid OOM kills with large UDP sends over loopback	2021-07-19 09:44:53 +02:00
ip_sockglue.c	net: Remove duplicated midx check against 0	2020-08-25 06:23:59 -07:00
ip_tunnel_core.c	tunnels: Fix off-by-one in lower MTU bounds for ICMP/ICMPv6 replies	2020-11-09 15:39:39 -08:00
ip_tunnel.c	net: always use icmp{,v6}_ndo_send from ndo_start_xmit	2021-03-17 17:06:12 +01:00
ip_vti.c	net: always use icmp{,v6}_ndo_send from ndo_start_xmit	2021-03-17 17:06:12 +01:00
ipcomp.c	ipcomp: assign if_id to child tunnel from parent tunnel	2020-07-09 12:55:37 +02:00
ipconfig.c	net: ipconfig: Don't override command-line hostnames or domains	2021-06-18 10:00:05 +02:00
ipip.c	net: ipip: implement header_ops->parse_protocol for AF_PACKET	2020-06-30 12:29:39 -07:00
ipmr_base.c	net: fib_notifier: propagate extack down to the notifier block callback	2019-10-04 11:10:56 -07:00
ipmr.c	ipmr: Use full VIF ID in netlink cache reports	2020-09-10 12:25:51 -07:00
Kconfig	net: ipv4: remove duplicate "the the" phrase in Kconfig text	2020-08-18 16:02:16 -07:00
Makefile	udp_tunnel: add central NIC RX port offload infrastructure	2020-07-10 13:54:00 -07:00
metrics.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
netfilter.c	netfilter: use actual socket sk rather than skb sk when routing harder	2020-10-30 12:57:39 +01:00
netlink.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
nexthop.c	nexthop: Do not flush blackhole nexthops when loopback goes down	2021-03-17 17:06:14 +01:00
ping.c	ping: Check return value of function 'ping_queue_rcv_skb'	2021-06-30 08:47:20 -04:00
proc.c	tcp: skip DSACKs with dubious sequence ranges	2020-09-24 20:15:45 -07:00
protocol.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
raw_diag.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 22:34:48 -07:00
raw.c	networking changes for the 5.10 merge window	2020-10-15 18:42:13 -07:00
route.c	net: lwtunnel: handle MTU calculation in forwading	2021-07-14 16:56:32 +02:00
syncookies.c	net: Update window_clamp if SOCK_RCVBUF is set	2020-11-10 17:42:35 -08:00
sysctl_net_ipv4.c	net: Make tcp_allowed_congestion_control readonly in non-init netns	2021-04-21 13:00:57 +02:00
tcp_bbr.c	tcp: only postpone PROBE_RTT if RTT is < current min_rtt estimate	2020-11-17 11:03:22 -08:00
tcp_bic.c	tcp: fix stretch ACK bugs in BIC	2020-03-16 18:26:54 -07:00
tcp_bpf.c	bpf, sockmap: Ensure SO_RCVBUF memory is observed on ingress redirect	2020-11-18 00:12:34 +01:00
tcp_cdg.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_cong.c	net: Only allow init netns to set default tcp cong to a restricted algo	2021-05-14 09:50:46 +02:00
tcp_cubic.c	tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT	2020-06-25 16:08:47 -07:00
tcp_dctcp.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
tcp_dctcp.h	tcp: refactor DCTCP ECN ACK handling	2018-10-10 22:26:00 -07:00
tcp_diag.c	inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data	2020-02-27 18:50:19 -08:00
tcp_fastopen.c	bpf: tcp: Add bpf_skops_established()	2020-08-24 14:35:00 -07:00
tcp_highspeed.c	Replace HTTP links with HTTPS ones: IPv*	2020-07-06 13:23:03 -07:00
tcp_htcp.c	Replace HTTP links with HTTPS ones: IPv*	2020-07-06 13:23:03 -07:00
tcp_hybla.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_illinois.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_input.c	net: tcp better handling of reordering then loss cases	2021-07-19 09:44:45 +02:00
tcp_ipv4.c	tcp: Fix potential use-after-free due to double kfree()	2021-01-27 11:55:28 +01:00
tcp_lp.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_metrics.c	genetlink: move to smaller ops wherever possible	2020-10-02 19:11:11 -07:00
tcp_minisocks.c	tcp: relookup sock for RST+ACK packets handled by obsolete req sock	2021-03-30 14:31:59 +02:00
tcp_nv.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_offload.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
tcp_output.c	tcp: make TCP_USER_TIMEOUT accurate for zero window probes	2021-02-03 23:28:51 +01:00
tcp_rate.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00
tcp_recovery.c	tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN	2021-02-03 23:28:52 +01:00
tcp_scalable.c	net: ipv4: delete repeated words	2020-08-24 17:31:20 -07:00
tcp_timer.c	tcp: make TCP_USER_TIMEOUT accurate for zero window probes	2021-02-03 23:28:51 +01:00
tcp_ulp.c	bpf: sockmap: Only check ULP for TCP sockets	2020-03-09 22:34:58 +01:00
tcp_vegas.c	tcp: use semicolons rather than commas to separate statements	2020-10-13 17:11:52 -07:00
tcp_vegas.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
tcp_veno.c	Replace HTTP links with HTTPS ones: IPv*	2020-07-06 13:23:03 -07:00
tcp_westwood.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
tcp_yeah.c	tcp: fix stretch ACK bugs in Yeah	2020-03-16 18:26:55 -07:00
tcp.c	tcp: add sanity tests to TCP_QUEUE_SEQ	2021-03-17 17:06:11 +01:00
tunnel4.c	tunnel4: add cb_handler to struct xfrm_tunnel	2020-07-09 12:51:36 +02:00
udp_bpf.c	net: sk_msg: Simplify sk_psock initialization	2020-08-21 15:16:11 -07:00
udp_diag.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-12 22:34:48 -07:00
udp_impl.h	net: pass a sockptr_t into ->setsockopt	2020-07-24 15:41:54 -07:00
udp_offload.c	net: Fix gro aggregation for udp encaps with zero csum	2021-03-17 17:06:11 +01:00
udp_tunnel_core.c	udp_tunnel: add central NIC RX port offload infrastructure	2020-07-10 13:54:00 -07:00
udp_tunnel_nic.c	udp_tunnel: add the ability to share port tables	2020-09-28 12:50:12 -07:00
udp_tunnel_stub.c	udp_tunnel: add central NIC RX port offload infrastructure	2020-07-10 13:54:00 -07:00
udp.c	udp: fix race between close() and udp_abort()	2021-06-23 14:42:42 +02:00
udplite.c	net/ipv4: remove compat_ip_{get,set}sockopt	2020-07-19 18:16:41 -07:00
xfrm4_input.c	xfrm: state: remove extract_input indirection from xfrm_state_afinfo	2020-05-06 09:40:08 +02:00
xfrm4_output.c	xfrm: fix unused variable warning if CONFIG_NETFILTER=n	2020-05-11 15:12:27 +02:00
xfrm4_policy.c	net: add bool confirm_neigh parameter for dst_ops.update_pmtu	2019-12-24 22:28:54 -08:00
xfrm4_protocol.c	xfrm: add route lookup to xfrm4_rcv_encap	2019-12-09 09:59:07 +01:00
xfrm4_state.c	xfrm: remove output_finish indirection from xfrm_state_afinfo	2020-05-06 09:40:08 +02:00
xfrm4_tunnel.c	xfrm: interface: fix the priorities for ipip and ipv6 tunnels	2020-10-09 12:29:48 +02:00