linux-stable.git/net/ipv4/proc.c, branch v4.12.2

net/tcp_fastopen: Add snmp counter for blackhole detection

2017-04-24T18:27:17+00:00

This counter records the number of times the firewall blackhole issue is
detected and active TFO is disabled.

Signed-off-by: Wei Wang 
Acked-by: Yuchung Cheng 
Acked-by: Neal Cardwell 
Signed-off-by: David S. Miller

tcp: remove tcp_tw_recycle

2017-03-17T03:33:56+00:00

The tcp_tw_recycle was already broken for connections
behind NAT, since the per-destination timestamp is not
monotonically increasing for multiple machines behind
a single destination address.

After the randomization of TCP timestamp offsets
in commit 8a5bd45f6616 (tcp: randomize tcp timestamp offsets
for each connection), the tcp_tw_recycle is broken for all
types of connections for the same reason: the timestamps
received from a single machine is not monotonically increasing,
anymore.

Remove tcp_tw_recycle, since it is not functional. Also, remove
the PAWSPassive SNMP counter since it is only used for
tcp_tw_recycle, and simplify tcp_v4_route_req and tcp_v6_route_req
since the strict argument is only set when tcp_tw_recycle is
enabled.

Signed-off-by: Soheil Hassas Yeganeh 
Signed-off-by: Eric Dumazet 
Signed-off-by: Neal Cardwell 
Signed-off-by: Yuchung Cheng 
Cc: Lutz Vieweg 
Cc: Florian Westphal 
Signed-off-by: David S. Miller

net: add LINUX_MIB_PFMEMALLOCDROP counter

2017-02-03T04:34:19+00:00

Debugging issues caused by pfmemalloc is often tedious.

Add a new SNMP counter to more easily diagnose these problems.

Signed-off-by: Eric Dumazet 
Cc: Josef Bacik 
Acked-by: Josef Bacik 
Signed-off-by: David S. Miller

net: remove bh disabling around percpu_counter accesses

2017-01-20T16:27:22+00:00

Shaohua Li made percpu_counter irq safe in commit 098faf5805c8
("percpu_counter: make APIs irq safe")

We can safely remove BH disable/enable sections around various
percpu_counter manipulations.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

ipv4: Namespaceify tcp_tw_recycle and tcp_max_tw_buckets knob

2016-12-29T16:38:31+00:00

Different namespace application might require fast recycling
TIME-WAIT sockets independently of the host.

Signed-off-by: Haishuang Yan 
Signed-off-by: David S. Miller

net: Suppress the "Comparison to NULL could be written" warnings

2016-09-30T05:50:45+00:00

This is to suppress the checkpatch.pl warning "Comparison to NULL
could be written". No functional changes here.

Signed-off-by: Jia He 
Signed-off-by: David S. Miller

proc: Reduce cache miss in snmp_seq_show

2016-09-30T05:50:44+00:00

This is to use the generic interfaces snmp_get_cpu_field{,64}_batch to
aggregate the data by going through all the items of each cpu sequentially.
Then snmp_seq_show is split into 2 parts to avoid build warning "the frame
size" larger than 1024.

Signed-off-by: Jia He 
Signed-off-by: David S. Miller

tcp: md5: add LINUX_MIB_TCPMD5FAILURE counter

2016-08-25T23:43:11+00:00

Adds SNMP counter for drops caused by MD5 mismatches.

The current syslog might help, but a counter is more precise and helps
monitoring.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

ipv4: Namespaceify ip_default_ttl sysctl knob

2016-02-17T01:42:54+00:00

Signed-off-by: Nikolay Borisov 
Signed-off-by: David S. Miller

net: track success and failure of TCP PMTU probing

2015-07-22T05:36:33+00:00

Track success and failure of TCP PMTU probing.

Signed-off-by: Rick Jones 
Signed-off-by: David S. Miller