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linux/net/ipv4
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Christoph Paasch 77f99ad16a tcp: metrics: Avoid duplicate entries with the same destination-IP 
Because the tcp-metrics is an RCU-list, it may be that two
soft-interrupts are inside __tcp_get_metrics() for the same
destination-IP at the same time. If this destination-IP is not yet part of
the tcp-metrics, both soft-interrupts will end up in tcpm_new and create
a new entry for this IP.
So, we will have two tcp-metrics with the same destination-IP in the list.

This patch checks twice __tcp_get_metrics(). First without holding the
lock, then while holding the lock. The second one is there to confirm
that the entry has not been added by another soft-irq while waiting for
the spin-lock.

Fixes: 51c5d0c4b169b (tcp: Maintain dynamic metrics in local cache.)
Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-01-17 18:05:34 -08:00
..
netfilter
netfilter: nft_reject: fix endianness in dump function
2013-12-12 09:37:39 +01:00
af_inet.c
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-11-14 16:30:30 +09:00
ah4.c
ipv4: properly refresh rtable entries on pmtu/redirect events
2013-06-03 00:07:42 -07:00
arp.c
net: neighbour: Remove CONFIG_ARPD
2013-09-03 21:41:43 -04:00
cipso_ipv4.c
cipso: don't follow a NULL pointer when setsockopt() is called
2012-07-18 09:01:12 -07:00
datagram.c
ipv4: fix possible seqlock deadlock
2013-11-14 17:31:14 -05:00
devinet.c
net: igmp: Allow user-space configuration of igmp unsolicited report interval
2013-08-09 11:27:46 -07:00
esp4.c
net: esp{4,6}: get rid of struct esp_data
2013-10-29 06:39:42 +01:00
fib_frontend.c
fib_trie: remove duplicated rcu lock
2013-10-18 13:53:59 -04:00
fib_lookup.h
net: ipv4/ipv6: Remove extern from function prototypes
2013-10-19 19:12:11 -04:00
fib_rules.c
inet: fix NULL pointer Oops in fib(6)_rule_suppress
2013-12-10 17:54:23 -05:00
fib_semantics.c
fib: Use const struct nl_info * in rtmsg_fib
2013-10-18 14:42:15 -04:00
fib_trie.c
seq_file: remove "%n" usage from seq_file users
2013-11-15 09:32:20 +09:00
gre_demux.c
ipv4: generalize gre_handle_offloads
2013-10-19 19:36:18 -04:00
gre_offload.c
ipv4: fix tunneled VM traffic over hw VXLAN/GRE GSO NIC
2014-01-02 19:06:47 -05:00
icmp.c
ipv4: processing ancillary IP_TOS or IP_TTL
2013-09-28 15:21:52 -07:00
igmp.c
ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put
2013-09-30 22:28:56 -07:00
inet_connection_sock.c
inet: rename ir_loc_port to ir_num
2013-10-10 14:37:35 -04:00
inet_diag.c
inet_diag: fix inet_diag_dump_icsk() to use correct state for timewait sockets
2014-01-13 22:35:46 -08:00
inet_fragment.c
inet: remove old fragmentation hash initializing
2013-10-23 17:01:41 -04:00
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
ipv4: replace ip_fast_csum with csum_replace2
2013-03-15 09:12:25 -04:00
inet_timewait_sock.c
tcp/dccp: remove twchain
2013-10-08 23:19:24 -04:00
inetpeer.c
ip: generate unique IP identificator if local fragmentation is allowed
2013-09-19 14:11:15 -04:00
ip_forward.c
ipv4: introduce rt_uses_gateway
2012-10-08 17:42:36 -04:00
ip_fragment.c
ipv4: initialize ip4_frags hash secret as late as possible
2013-10-23 17:01:40 -04:00
ip_gre.c
ip_gre: fix msg_name parsing for recvfrom/recvmsg
2013-12-18 17:44:33 -05:00
ip_input.c
net: add SNMP counters tracking incoming ECN bits
2013-08-08 22:24:59 -07:00
ip_options.c
net/ipv4: Ensure that location of timestamp option is stored
2013-03-12 05:35:39 -04:00
ip_output.c
ipv4: consistent reporting of pmtu data in case of corking
2013-12-22 18:52:09 -05:00
ip_sockglue.c
inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions
2013-11-23 14:46:23 -08:00
ip_tunnel_core.c
ipv4: generalize gre_handle_offloads
2013-10-19 19:36:18 -04:00
ip_tunnel.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2013-11-19 15:50:47 -08:00
ip_vti.c
xfrm: Release dst if this dst is improper for vti tunnel
2013-11-19 15:50:57 -05:00
ipcomp.c
ipv4: properly refresh rtable entries on pmtu/redirect events
2013-06-03 00:07:42 -07:00
ipconfig.c
ipconfig: add informative timeout messages while waiting for carrier
2013-04-02 14:35:33 -04:00
ipip.c
ipip: add GSO/TSO support
2013-10-19 19:36:19 -04:00
ipmr.c
net: avoid reference counter overflows on fib_rules in multicast forwarding
2014-01-14 17:37:25 -08:00
Kconfig
net: neighbour: Remove CONFIG_ARPD
2013-09-03 21:41:43 -04:00
Makefile
net: gre: move GSO functions to gre_offload
2013-07-03 14:37:39 -07:00
netfilter.c
netfilter: add my copyright statements
2013-04-18 20:27:55 +02:00
ping.c
inet: fix possible seqlock deadlocks
2013-11-29 16:37:36 -05:00
proc.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2013-08-16 15:37:26 -07:00
protocol.c
net: remove outdated comment for ipv4 and ipv6 protocol handler
2013-11-28 18:47:51 -05:00
raw.c
inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions
2013-11-23 14:46:23 -08:00
route.c
ipv4: fix race in concurrent ip_route_input_slow()
2013-11-20 15:28:44 -05:00
syncookies.c
inet: split syncookie keys for ipv4 and ipv6 and initialize with net_get_random_once
2013-10-19 19:45:35 -04:00
sysctl_net_ipv4.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_bic.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_cong.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_cubic.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_diag.c
…
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
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_input.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_ipv4.c
inet: fix possible seqlock deadlocks
2013-11-29 16:37:36 -05:00
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: Avoid duplicate entries with the same destination-IP
2014-01-17 18:05:34 -08:00
tcp_minisocks.c
ipv6: make lookups simpler and faster
2013-10-09 00:01:25 -04:00
tcp_offload.c
gro: Clean up tcpX_gro_receive checksum verification
2013-11-23 14:46:19 -08:00
tcp_output.c
tcp: don't update snd_nxt, when a socket is switched from repair mode
2013-11-19 16:14:20 -05:00
tcp_probe.c
ipv6: make lookups simpler and faster
2013-10-09 00:01:25 -04:00
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: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_vegas.h
net: ipv4/ipv6: Remove extern from function prototypes
2013-10-19 19:12:11 -04:00
tcp_veno.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp_westwood.c
tcp: refactor F-RTO
2013-03-21 11:47:50 -04:00
tcp_yeah.c
tcp: properly handle stretch acks in slow start
2013-11-04 19:57:59 -05:00
tcp.c
Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
2013-11-20 13:20:24 -08:00
tunnel4.c
net: Convert printks to pr_<level>
2012-03-11 23:42:51 -07:00
udp_diag.c
netlink: rename ssk to sk in struct netlink_skb_params
2013-04-19 14:57:56 -04:00
udp_impl.h
net: ipv4/ipv6: Remove extern from function prototypes
2013-10-19 19:12:11 -04:00
udp_offload.c
ipv4: fix tunneled VM traffic over hw VXLAN/GRE GSO NIC
2014-01-02 19:06:47 -05:00
udp.c
ipv4: fix tunneled VM traffic over hw VXLAN/GRE GSO NIC
2014-01-02 19:06:47 -05:00
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
…
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2013-09-30 15:24:57 -04:00
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
xfrm: make local error reporting more robust
2013-08-14 13:07:12 +02:00
xfrm4_tunnel.c
sit: add IPv4 over IPv4 support
2013-05-31 17:19:05 -07:00