[Bug 260120] [sctp] DSCP/TOS not always set during an association establishment (IPv6)

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 29 Nov 2021 14:56:41 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260120

            Bug ID: 260120
           Summary: [sctp] DSCP/TOS not always set during an association
                    establishment (IPv6)
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: albin.hellqvist@ericsson.com

Created attachment 229796
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229796&action=edit
Pcaps for different DSCP/TOS scenarios

It seems like the DSCP/TOS field isn't getting set for INIT_ACK (but is for
COOKIE_ACK) when establishing an SCTP association (IPv6). This works for IPv4
however.

I have made a summary here:
FreeBSD 12.2:
IPv4 TCP:  Working
IPv6 TCP:  Not working
IPv4 SCTP: Working
IPv6 SCTP: Not working

FreeBSD 13.0:
IPv4 TCP:  Working
IPv6 TCP:  Working
IPv4 SCTP: Working
IPv6 SCTP: Not working

Linux:
IPv4 TCP:  Working
IPv6 TCP:  Working
IPv4 SCTP: Working
IPv6 SCTP: Working

I haven't tested this for the FIN/SHUTDOWN phase.

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