Date: Tue, 8 Apr 2014 11:38:41 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: if_nameindex/getifaddrs and dhcpcd issue On Tue, Apr 08, 2014 at 03:16:10PM +0100, Justin Cormack wrote: > On Tue, Apr 8, 2014 at 2:42 PM, Rich Felker <dalias@...ifal.cx> wrote: > >> and it only needs to read ipv4 addresses, > >> unless it is implementing dhcp6 too, maybe it does now. Again dhcp6 > >> needs netlink, the Musl ipv6 parts for getifaddrs already use /proc > >> which is definitely unreliable for early boot config in a distro in my > >> view. > > > > In what way does dhcp6 need netlink? What's made this discussion > > difficult so far on IRC is assertions of that form (although not the > > same one) without an explanation of why it's believed to be true, so > > I'd like to keep rational discussion possible by making sure that such > > claims are backed up by explanation rather than just stated as fact. > > I was under the impression that the ioctl-based interface for ipv6 is > incomplete under Linux. Probably "incomplete" in a sense that it can't do some special-purpose stuff that most users don't need. Busybox entirely avoids netlink, as far as I can tell, and it's perfectly acceptable for setting up ipv6, at least in simple setups. You don't even need busybox's iproute2 workalikes; ifconfig and route work fine. > That does not mean anything needs to be in > libc though. ISC dhcp for v6 just calls out to ip in scripts, rather > than ifconfig that it uses for v4, so it is indirectly uses netlink, > but does not require any libc support, indeed all the C code is > portable. udhcpcd works the same; it doesn't make any changes to the interfaces; it just speaks the dhcp protocol. This is really the correct factorization. Rich
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