On Tue, Jun 03, 2003 at 04:07:08PM -0500, Jon Grimm wrote:
> Hi Adrian,
Hi Jon,
> Sorry for a bit of delay... We are away at an SCTP Interoperability
> event.
the delay before my answer was bigger...
> Adrian Bunk wrote:
> >On Mon, Jun 02, 2003 at 09:53:04AM +0200, Margit Schubert-While wrote:
> >
> >
> >>CONFIG_IPV6_SCTP__ is always being set to "y" even though
> >>not selected (CONFIG_IPV6 not set)
> >
> >
> >First, this doesn't do any harm since CONFIG_IPV6_SCTP__ alone doensn't
> >result in anything getting compiled.
> >
> >But besides, it seems a bit broken.
> >
> >From net/sctp/Kconfig:
> >
> ><-- snip -->
> >
> >...
> >
> >config IPV6_SCTP__
> > tristate
> > default y if IPV6=n
> > default IPV6 if IPV6
> >
> >config IP_SCTP
> > tristate "The SCTP Protocol (EXPERIMENTAL)"
> > depends on IPV6_SCTP__
> >...
> >
> ><-- snip -->
> >
> >
> >Semantically equivalent is the following for IPV6_SCTP__:
> >
> >config IPV6_SCTP__
> > tristate
> > default y if IPV6=n || IPV6=y
> > default m if IPV6=m
> >
> >
> >If it was intended to disallow a static IP_SCTP with a modular IPV6 it
> >doesn't work: It's perfectly allowed to set IPV6=n and IP_SCTP=y and
> >later compile and install a modular IPV6 for the same kernel.
> >
>
> Are you sure? I vaguely remember one of the network structs having
> #ifdef'd fields for v6. Consequently, if one compiles first without,
> but the tries later compiles/loads ipv6... bad things happen as the
> kernel has a different concept of what the sock is.
after reading this at net/Kconfig:
<-- snip -->
...
# IPv6 as module will cause a CRASH if you try to unload it
config IPV6
tristate "The IPv6 protocol (EXPERIMENTAL)"
...
<-- snip -->
I'm wondering whether it might be an idea to disallow the modular
building of IPv6 support?
> >Could someone from the SCTP developers comment on the intentions behind
> >IPV6_SCTP__ ?
> >
>
> Yes. The intent was to at least discourage a configuration that will
> segfault.
It's currently discouraged but not completelyt impossible to select...
> Thanks,
> jon
cu
Adrian
--"Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed
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