quoted

At some point the negotiation of the number of SCTP streams
seems to have got broken.
I've definitely tested it in the past (probably 10 years ago!)
but on a 5.8.0 kernel getsockopt(SCTP_INFO) seems to be
returning the 'num_ostreams' set by setsockopt(SCTP_INIT)
rather than the smaller of that value and that configured
at the other end of the connection.

I'll do a bit of digging.

I can't find the code that processes the init_ack.
But when sctp_procss_int() saves the smaller value
in asoc->c.sinint_max_ostreams.

But afe899962ee079 (if I've typed it right) changed
the values SCTP_INFO reported.
Apparantly adding 'sctp reconfig' had changed things.

So I suspect this has all been broken for over 3 years.

It looks like the changes that broke it went into 4.11.
I've just checked a 3.8 kernel and that negotiates the
values down in both directions.

I don't have any kernels lurking between 3.8 and 4.15.
(Yes, I could build one, but it doesn't really help.)

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)