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linux/net/ipv4
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Eric Dumazet 4fbc908296 tcp: avoid looping in tcp_send_fin() 
[ Upstream commit 845704a535 ]

Presence of an unbound loop in tcp_send_fin() had always been hard
to explain when analyzing crash dumps involving gigantic dying processes
with millions of sockets.

Lets try a different strategy :

In case of memory pressure, try to add the FIN flag to last packet
in write queue, even if packet was already sent. TCP stack will
be able to deliver this FIN after a timeout event. Note that this
FIN being delivered by a retransmit, it also carries a Push flag
given our current implementation.

By checking sk_under_memory_pressure(), we anticipate that cooking
many FIN packets might deplete tcp memory.

In the case we could not allocate a packet, even with __GFP_WAIT
allocation, then not sending a FIN seems quite reasonable if it allows
to get rid of this socket, free memory, and not block the process from
eventually doing other useful work.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-05-06 21:59:07 +02:00
..
netfilter netfilter: ipv4: defrag: set local_df flag on defragmented skb 2014-06-16 13:40:32 -07:00
af_inet.c net-gre-gro: Fix a bug that breaks the forwarding path 2014-07-28 08:06:01 -07:00
ah4.c ipv4: properly refresh rtable entries on pmtu/redirect events 2013-06-03 00:07:42 -07:00
arp.c ipv4: arp: update neighbour address when a gratuitous arp is received and arp_accept is set 2014-01-02 00:08:38 -05:00
cipso_ipv4.c ipv4: ERROR: code indent should use tabs where possible 2013-12-26 13:43:21 -05:00
datagram.c ipv4: fix a race in ip4_datagram_release_cb() 2014-06-26 15:15:40 -04:00
devinet.c ipv4: Fix runtime WARNING in rtmsg_ifa() 2014-02-06 20:02:15 -08:00
esp4.c net: esp{4,6}: get rid of struct esp_data 2013-10-29 06:39:42 +01:00
fib_frontend.c fib_frontend: fix possible NULL pointer dereference 2014-01-24 15:51:26 -08:00
fib_lookup.h ipv4: make fib_detect_death static 2013-12-28 17:01:46 -05:00
fib_rules.c ipv4: Fix incorrect error code when adding an unreachable route 2014-12-06 15:55:33 -08:00
fib_semantics.c ipv4: fix nexthop attlen check in fib_nh_match 2014-11-14 08:59:42 -08:00
fib_trie.c seq_file: remove "%n" usage from seq_file users 2013-11-15 09:32:20 +09:00
gre_demux.c ip_tunnel: Fix dst ref-count. 2014-03-26 15:18:40 -04:00
gre_offload.c gre: Set inner mac header in gro complete 2014-12-16 09:34:27 -08:00
icmp.c ipv4: icmp: Fix pMTU handling for rare case 2014-07-28 08:06:00 -07:00
igmp.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
inet_connection_sock.c net: replace macros net_random and net_srandom with direct calls to prandom 2014-01-14 15:15:25 -08:00
inet_diag.c inet_diag: fix possible overflow in inet_diag_dump_one_icsk() 2015-03-26 15:06:50 +01:00
inet_fragment.c inet: frag: make sure forced eviction removes all frags 2014-03-06 15:28:45 -05:00
inet_hashtables.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
inet_lro.c lro: remove dead code 2013-12-29 16:34:25 -05:00
inet_timewait_sock.c tcp/dccp: remove twchain 2013-10-08 23:19:24 -04:00
inetpeer.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
ip_forward.c ip_forward: Drop frames with attached skb->sk 2015-05-06 21:59:07 +02:00
ip_fragment.c ipv4: ip_check_defrag should not assume that skb_network_offset is zero 2015-03-18 13:31:21 +01:00
ip_gre.c gre: fix the inner mac header in nbma tunnel xmit path 2015-01-27 08:18:52 -08:00
ip_input.c net: Fix memory leak if TPROXY used with TCP early demux 2014-01-27 16:22:11 -08:00
ip_options.c ipv4: fix buffer overflow in ip_options_compile() 2014-07-28 08:06:01 -07:00
ip_output.c udp: only allow UFO for packets from SOCK_DGRAM sockets 2015-03-18 13:31:23 +01:00
ip_sockglue.c ip: zero sockaddr returned on error queue 2015-02-26 17:50:10 -08:00
ip_tunnel.c ip_tunnel(ipv4): fix tunnels with "local any remote $remote_ip" 2014-08-14 09:38:23 +08:00
ip_tunnel_core.c ipv4: fix a potential use after free in ip_tunnel_core.c 2014-11-14 08:59:43 -08:00
ip_vti.c ip_tunnel: the lack of vti_link_ops' dellink() cause kernel panic 2014-12-16 09:34:27 -08:00
ipcomp.c ipv4: properly refresh rtable entries on pmtu/redirect events 2013-06-03 00:07:42 -07:00
ipconfig.c ipv4: ipconfig.c: add parentheses in an if statement 2014-02-14 00:14:23 -05:00
ipip.c ipip, sit: fix ipv4_{update_pmtu,redirect} calls 2014-06-26 15:15:40 -04:00
ipmr.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
Kconfig net: neighbour: Remove CONFIG_ARPD 2013-09-03 21:41:43 -04:00
Makefile gre_offload: statically build GRE offloading support 2014-01-06 20:28:34 -05:00
netfilter.c netfilter: add my copyright statements 2013-04-18 20:27:55 +02:00
ping.c net: ping: Return EAFNOSUPPORT when appropriate. 2015-03-18 13:31:23 +01:00
proc.c ipv4: spaces required around that '=' 2014-01-02 03:30:36 -05:00
protocol.c net: remove outdated comment for ipv4 and ipv6 protocol handler 2013-11-28 18:47:51 -05:00
raw.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
route.c ipv4: try to cache dst_entries which would cause a redirect 2015-02-26 17:50:10 -08:00
syncookies.c ipv4: fix checkpatch error "space prohibited" 2013-12-26 13:43:21 -05:00
sysctl_net_ipv4.c ipv4: introduce ip_dst_mtu_maybe_forward and protect forwarding path against pmtu spoofing 2014-01-13 11:22:54 -08:00
tcp.c tcp: md5: do not use alloc_percpu() 2014-11-14 08:59:43 -08:00
tcp_bic.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_cong.c tcp: reduce the bloat caused by tcp_is_cwnd_limited() 2014-02-24 19:13:38 -05:00
tcp_cubic.c tcp_cubic: fix the range of delayed_ack 2014-05-31 13:20:36 -07:00
tcp_diag.c inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
tcp_fastopen.c tcp: enable sockets to use MSG_FASTOPEN by default 2013-11-04 19:57:47 -05:00
tcp_highspeed.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_htcp.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_hybla.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_illinois.c remove extra definitions of U32_MAX 2014-01-23 16:36:55 -08:00
tcp_input.c tcp: fix FRTO undo on cumulative ACK of SACKed range 2015-04-29 10:31:46 +02:00
tcp_ipv4.c tcp: prevent fetching dst twice in early demux code 2015-04-29 10:31:45 +02:00
tcp_lp.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_memcontrol.c tcp_memcontrol: Cleanup/fix cg_proto->memory_pressure handling. 2013-12-05 21:01:01 -05:00
tcp_metrics.c tcp: metrics: Handle v6/v4-mapped sockets in tcp-metrics 2014-01-23 12:48:28 -08:00
tcp_minisocks.c ipv6: tcp: fix flowlabel value in ACK messages send from TIME_WAIT 2014-01-17 17:56:33 -08:00
tcp_offload.c net-gre-gro: Fix a bug that breaks the forwarding path 2014-07-28 08:06:01 -07:00
tcp_output.c tcp: avoid looping in tcp_send_fin() 2015-05-06 21:59:07 +02:00
tcp_probe.c ipv4: ERROR: do not initialise globals to 0 or NULL 2013-12-26 13:43:21 -05:00
tcp_scalable.c tcp: properly handle stretch acks in slow start 2013-11-04 19:57:59 -05:00
tcp_timer.c tcp: temporarily disable Fast Open on SYN timeout 2013-10-29 22:50:41 -04:00
tcp_vegas.c tcp: Fix integer-overflow in TCP vegas 2014-08-14 09:38:24 +08:00
tcp_vegas.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
tcp_veno.c tcp: Fix integer-overflows in TCP veno 2014-08-14 09:38:23 +08:00
tcp_westwood.c tcp: refactor F-RTO 2013-03-21 11:47:50 -04:00
tcp_yeah.c ipv4: ipv4: Cleanup the comments in tcp_yeah.c 2013-12-26 13:43:55 -05:00
tunnel4.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
udp.c udp: ipv4: do not waste time in __udp4_lib_mcast_demux_lookup 2014-06-26 15:15:40 -04:00
udp_diag.c udp_diag: Fix socket skipping within chain 2015-02-26 17:50:11 -08:00
udp_impl.h net: ipv4/ipv6: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
udp_offload.c net/ipv4: Use proper RCU APIs for writer-side in udp_offload.c 2014-02-04 20:01:55 -08:00
udplite.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
xfrm4_input.c net: Add skb_unclone() helper function. 2013-02-15 15:10:37 -05:00
xfrm4_mode_beet.c ipv4: ERROR: code indent should use tabs where possible 2013-12-26 13:43:21 -05:00
xfrm4_mode_transport.c [IPSEC]: Use IPv6 calling convention as the convention for x->mode->output 2007-10-10 16:55:54 -07:00
xfrm4_mode_tunnel.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
xfrm4_output.c xfrm: revert ipv4 mtu determination to dst_mtu 2013-08-26 12:40:53 +02:00
xfrm4_policy.c xfrm: Fix null pointer dereference when decoding sessions 2013-11-01 07:08:46 +01:00
xfrm4_state.c inet: make no_pmtu_disc per namespace and kill ipv4_config 2013-12-18 16:58:20 -05:00
xfrm4_tunnel.c sit: add IPv4 over IPv4 support 2013-05-31 17:19:05 -07:00