Can someone help me in understanding the SCTP stats captured on linux

Question

I am new to SCTP protocol and trying to figure out how to interpret the SCTP stats captured by /proc/net/sctp

The output shows something like this.
2016-04-26 07:21:17
ASSOC     SOCK   STY SST ST HBKT ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT RPORT LADDRS <-> RADDRS HBINT INS OUTS MAXRT T1X T2X RTXC wmema wmemq sndbuf rcvbuf
ce0f1800 cd7ede00 2   1   3  11661 1783      423        0      77 292723 36422 36423  10.205.8.71 <-> *10.205.8.72                  3000    10    10   10    0    0        0      873      704   163840   163840
ca625800 cd7ec000 2   1   3  65210    1        0        0      77 10344 3223  36412  10.205.8.71 <-> *10.205.0.135           3000     2     2   10    0    0        3        1        0   163840   163840
ENDPT     SOCK   STY SST HBKT LPORT   UID INODE LADDRS
ca511d80 cd7ec3c0 2   10  40   36422    77 10345 10.205.8.71 
ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX REM_ADDR_RTX  START
10.205.8.72  1783 1 200 5 0 0
10.205.0.135  1 1 200 15 0 0
SctpCurrEstab                   2
SctpActiveEstabs                              21
SctpPassiveEstabs                           1855
SctpAborteds                    272
SctpShutdowns                                1808
SctpOutOfBlues                                0
SctpChecksumErrors                      0
SctpOutCtrlChunks                          79214
SctpOutOrderChunks                     327396
SctpOutUnorderChunks               0
SctpInCtrlChunks                             268038
SctpInOrderChunks                        174268
SctpInUnorderChunks                   0
SctpFragUsrMsgs                             0
SctpReasmUsrMsgs                        0
SctpOutSCTPPacks                          406626
SctpInSCTPPacks                              385959
SctpT1InitExpireds                           0
SctpT1CookieExpireds                   0
SctpT2ShutdownExpireds            0
SctpT3RtxExpireds                           5
SctpT4RtoExpireds                          0
SctpT5ShutdownGuardExpireds                0
SctpDelaySackExpireds                  9869
SctpAutocloseExpireds                  0
SctpT3Retransmits                          5
SctpPmtudRetransmits                 0
SctpFastRetransmits                       14
SctpInPktSoftirq                               384346
SctpInPktBacklog                             1613
SctpInPktDiscards                            0
SctpInDataChunkDiscards            0

Can some one help me understand this or provide the link where i can get some information.

Thanks, Vishal

Answer 1

The linux man page for SCTP (http://linux.die.net/man/7/sctp) has most of them covered - for example:

SctpChecksumErrors The number of SCTP packets received with an invalid checksum.

SctpOutCtrlChunks The number of SCTP control chunks sent (retransmissions are not included). Control chunks are those chunks different from DATA.

SctpOutOrderChunks The number of SCTP ordered data chunks sent (retransmissions are not included). SctpOutUnorderChunks

If there is a particular one you were wondering about, maybe let us know?