Date: Sat, 24 Sep 2011 19:23:09 +0200 From: =?iso-8859-1?Q?Michael_T=FCxen?= <Michael.Tuexen@lurchi.franken.de> To: jyl_2006 <yilinjing2006@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: message from sctp getsockopt or sctp_opt_info show error Message-ID: <C6C27F5F-6C41-42BC-9949-89335D59FF10@lurchi.franken.de> In-Reply-To: <1316871818655-4836594.post@n5.nabble.com> References: <1316871818655-4836594.post@n5.nabble.com>
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On Sep 24, 2011, at 3:43 PM, jyl_2006 wrote: > Recently , I use getsockopt or sctp_opt_info to get the information of sctp > association message, both two function return value of 0, and that means > they work well, but the result of testing show some error. > > Here are the result that getting from function getsockopt or sctp_opt_info: > > NO. ASSOC-ID STATE RWND UNACKDATA PENDDATA INSTRMS OUTSTRMS > FRAG-POINT SPINFO-STATE SPINFO-CWDN SPINFO-SRTT SPINFO-RTO SPINFO-MTU > 1 36 ESTABLISHED 57344 0 0 10 10 > 1452 ACTIVE 4380 0 3000 1500 > > other datas have same value with the data show above. > > But the message I get from wireshark ,show the value of RWND is changed > ,when I get a sack. It seems that you are using multiple socket options to get the above values. It doesn't matter whether you use getsockopt() or sctp_opt_info() on FreeBSD. Regarding the RWND: I assume that you print sasoc_peer_rwnd field of the sctp_assocparams structure retrieved via the SCTP_ASSOCINFO socket option. The number provided by the stack is the a_rwnd provided by the peer minus the outstanding data. Doesn't that match you observation? If not, please let me know how to reproduce the problem and which version of FreeBSD you are using. Best regards Michael > > So can anyone point out something we did wrong or steps we missed? > Thanks in advance. > > -- > View this message in context: http://freebsd.1045724.n5.nabble.com/message-from-sctp-getsockopt-or-sctp-opt-info-show-error-tp4836594p4836594.html > Sent from the freebsd-net mailing list archive at Nabble.com. > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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