Date: Sun, 7 Mar 2010 15:57:13 GMT From: Nigel Rumens <wooky@btconnect.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/144529: sctp over ipv6 appears to not calculate checksum Message-ID: <201003071557.o27FvDdf010747@www.freebsd.org> Resent-Message-ID: <201003071600.o27G02VQ088949@freefall.freebsd.org>
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>Number: 144529 >Category: kern >Synopsis: sctp over ipv6 appears to not calculate checksum >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Mar 07 16:00:02 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Nigel Rumens >Release: FreeBSD 8.0-RELEASE-p2 i386 >Organization: >Environment: FreeBSD victor.cwb.uk 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Thu Mar 4 10:50:02 GMT 2010 root@victor.cwb.uk:/usr/obj/usr/src/sys/VICTOR i386 >Description: testing feng (multimedia streaming server) between freebsd and linux to stream video over ipv6/sctp. Connection never gets to established state initiator linux running mplayer responder freebsd running feng I took a packet trace at the linux end with wireshark. It seems that the freebsd machine is sending the init_ack with a checksum of 0x00000000 linux machine also reports sctp checksum errors in proportion to number of init_acks it recieves. I am new to freebsd so feel free to tell me I'm an idiot if I've missed something or done something daft >How-To-Repeat: run feng on freebsd configured to use sctp over ipv6 run mplayer with -rtsp-stream-over-sctp option >Fix: Not sure if this is relavent or not but I had a quick look in the code for sctp_output.c and ip_output.c and ip6_output.c - and there appears to code which handles delayed checksum calculation based on a flag in ip_output.c but not in ip6_output.c Workaround is use ipv4 - I tested over ipv4 without problems >Release-Note: >Audit-Trail: >Unformatted:
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