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linux/net/ipv4
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Jakub Kicinski 6d123b81ac net: ip: avoid OOM kills with large UDP sends over loopback 
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>
2021-06-24 11:17:21 -07:00
..
bpfilter
net: Revert "net: optimize the sockptr_t for unified kernel/user address spaces"
2020-08-10 12:06:44 -07:00
netfilter
netfilter: nf_tables: add and use nft_sk helper
2021-05-29 01:04:53 +02:00
af_inet.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-06-18 19:47:02 -07:00
ah4.c
xfrm: Use actual socket sk instead of skb socket for xfrm_output_resume
2021-03-03 09:32:52 +01:00
arp.c
net: Exempt multicast addresses from five-second neighbor lifetime
2020-11-13 14:24:39 -08:00
bpf_tcp_ca.c
bpf: Limit static tcp-cc functions in the .BTF_ids list to x86
2021-05-11 23:23:07 +02:00
cipso_ipv4.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-06-18 19:47:02 -07:00
datagram.c
inet: stop leaking jiffies on the wire
2019-11-01 14:57:52 -07:00
devinet.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-06-18 19:47:02 -07:00
esp4_offload.c
xfrm: Provide private skb extensions for segmented and hw offloaded ESP packets
2021-03-29 09:14:12 +02:00
esp4.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2021-04-14 13:15:12 -07:00
fib_frontend.c
ipv4: Add a sysctl to control multipath hash fields
2021-05-18 13:27:32 -07:00
fib_lookup.h
ipv4: Fix spelling mistakes
2021-06-07 14:08:30 -07:00
fib_notifier.c
…
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
IPv4: Add "offload failed" indication to routes
2021-02-08 16:47:03 -08:00
fib_trie.c
IPv4: Extend 'fib_notify_on_flag_change' sysctl
2021-02-08 16:47:03 -08:00
fou.c
genetlink: move to smaller ops wherever possible
2020-10-02 19:11:11 -07:00
gre_demux.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
gre_offload.c
ip_gre: add csum offload support for gre header
2021-01-29 20:39:14 -08:00
icmp.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-06-18 19:47:02 -07:00
igmp.c
net: ipv4: fix memory leak in ip_mc_add1_src
2021-06-16 12:41:01 -07:00
inet_connection_sock.c
tcp: Add stats for socket migration.
2021-06-23 12:56:08 -07:00
inet_diag.c
inet_diag: add support for tw_mark
2021-06-16 00:38:59 -07:00
inet_fragment.c
inet: frags: batch fqdir destroy works
2020-12-12 15:08:54 -08:00
inet_hashtables.c
tcp: Keep TCP_CLOSE sockets in the reuseport group.
2021-06-15 18:01:05 +02:00
inet_timewait_sock.c
net: Use generic ns_common::count
2020-08-19 14:06:36 +02:00
inetpeer.c
inetpeer: use div64_ul() and clamp_val() calculate inet_peer_threshold
2021-03-01 13:32:12 -08:00
ip_forward.c
…
ip_fragment.c
…
ip_gre.c
ipv4/ipv6: switch to dev_get_tstats64
2020-11-09 17:50:28 -08:00
ip_input.c
net: use indirect call helpers for dst_input
2021-02-03 14:51:39 -08:00
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
2021-06-24 11:17:21 -07:00
ip_sockglue.c
net: Remove duplicated midx check against 0
2020-08-25 06:23:59 -07:00
ip_tunnel_core.c
net: ip_tunnel: clean up endianness conversions
2021-01-08 19:25:35 -08:00
ip_tunnel.c
net: always use icmp{,v6}_ndo_send from ndo_start_xmit
2021-03-01 13:11:35 -08:00
ip_vti.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
2021-03-31 14:37:51 -07:00
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
2021-06-02 13:27:03 -07:00
ipip.c
ipv4/ipv6: switch to dev_get_tstats64
2020-11-09 17:50:28 -08:00
ipmr_base.c
…
ipmr.c
ipv4: Fix spelling mistakes
2021-06-07 14:08:30 -07:00
Kconfig
net: ipv4: remove duplicate "the the" phrase in Kconfig text
2020-08-18 16:02:16 -07:00
Makefile
bpf: Clean up sockmap related Kconfigs
2021-02-26 12:28:03 -08:00
metrics.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
netfilter.c
netfilter: Dissect flow after packet mangling
2021-04-18 22:04:16 +02:00
netlink.c
…
nexthop.c
nexthop: Restart nexthop dump based on last dumped nexthop identifier
2021-04-19 15:20:34 -07:00
ping.c
ping: Check return value of function 'ping_queue_rcv_skb'
2021-06-10 13:44:55 -07:00
proc.c
tcp: Add stats for socket migration.
2021-06-23 12:56:08 -07:00
protocol.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -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
lsm,selinux: pass flowi_common instead of flowi to the LSM hooks
2020-11-23 18:36:21 -05:00
route.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-06-18 19:47:02 -07:00
syncookies.c
selinux/stable-5.11 PR 20201214
2020-12-16 11:01:04 -08:00
sysctl_net_ipv4.c
net: Introduce net.ipv4.tcp_migrate_req.
2021-06-15 18:01:05 +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
skmsg: Remove unused parameters of sk_msg_wait_data()
2021-05-18 16:44:19 +02:00
tcp_cdg.c
…
tcp_cong.c
net: Only allow init netns to set default tcp cong to a restricted algo
2021-05-04 11:58:28 -07:00
tcp_cubic.c
tcp: Rename bictcp function prefix to cubictcp
2021-03-26 20:41:51 -07:00
tcp_dctcp.c
…
tcp_dctcp.h
…
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
ipv4: Fix spelling mistakes
2021-06-07 14:08:30 -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
…
tcp_illinois.c
…
tcp_input.c
net: tcp better handling of reordering then loss cases
2021-06-03 14:20:44 -07:00
tcp_ipv4.c
tcp: Migrate TCP_NEW_SYN_RECV requests at receiving the final ACK.
2021-06-15 18:01:06 +02:00
tcp_lp.c
ipv4: tcp_lp.c: Couple of typo fixes
2021-03-28 17:31:13 -07:00
tcp_metrics.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
tcp_minisocks.c
tcp: Add stats for socket migration.
2021-06-23 12:56:08 -07:00
tcp_nv.c
…
tcp_offload.c
…
tcp_output.c
tcp: remove obsolete check in __tcp_retransmit_skb()
2021-03-11 18:35:31 -08:00
tcp_rate.c
…
tcp_recovery.c
tcp: fix TLP timer not set when CA_STATE changes from DISORDER to OPEN
2021-01-23 21:33:01 -08:00
tcp_scalable.c
net: ipv4: delete repeated words
2020-08-24 17:31:20 -07:00
tcp_timer.c
ipv4: Fix spelling mistakes
2021-06-07 14:08:30 -07:00
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
…
tcp_veno.c
Replace HTTP links with HTTPS ones: IPv*
2020-07-06 13:23:03 -07:00
tcp_westwood.c
…
tcp_yeah.c
tcp: fix stretch ACK bugs in Yeah
2020-03-16 18:26:55 -07:00
tcp.c
tcp: export timestamp helpers for mptcp
2021-06-04 14:08:09 -07:00
tunnel4.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
udp_bpf.c
skmsg: Remove unused parameters of sk_msg_wait_data()
2021-05-18 16:44:19 +02:00
udp_diag.c
net: udp: remove redundant initialization in udp_dump_one
2020-11-09 16:42:49 -08:00
udp_impl.h
net: pass a sockptr_t into ->setsockopt
2020-07-24 15:41:54 -07:00
udp_offload.c
udp: properly complete L4 GRO over UDP tunnel packet
2021-03-30 17:06:49 -07:00
udp_tunnel_core.c
udp_tunnel: reshuffle NETIF_F_RX_UDP_TUNNEL_PORT checks
2021-01-07 12:53:29 -08:00
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()
2021-06-09 14:08:41 -07:00
udplite.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -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
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
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