Date: Fri, 18 Jan 2002 15:23:09 +0100 (CET) From: Harti Brandt <brandt@fokus.gmd.de> To: Ruslan Ermilov <ru@FreeBSD.ORG> Cc: net@FreeBSD.ORG Subject: Re: interface creation notification Message-ID: <20020118151656.K97177-100000@beagle.fokus.gmd.de> In-Reply-To: <20020118120727.A12660@sunbay.com>
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On Fri, 18 Jan 2002, Ruslan Ermilov wrote: RE>On Fri, Jan 18, 2002 at 10:41:58AM +0100, Harti Brandt wrote: RE>> On Fri, 18 Jan 2002, Ruslan Ermilov wrote: RE>> RE>> RE>On Thu, Jan 17, 2002 at 06:58:26PM +0100, Harti Brandt wrote: RE>> RE>> RE>> RE>> Hi, RE>> RE>> RE>> RE>> how is a daemon supposed to get informed that a network interface has been RE>> RE>> created? I had hoped, that an RTM_IFINFO message would be created on the RE>> RE>> routing socket, but this is not the case. If an interface is destroyed, RE>> RE>> the routing socket gets a message for whatever reason. Wouldn't it be RE>> RE>> simple to just create an RTM_IFINFO message? RE>> RE>> RE>> RE>It does get created (you can check with the ``route -vn monitor'' command), RE>> RE>but please see PR kern/33747 for one small pitfall. RE>> RE>> That's exactly what I did, but it doesn't work. The only places, that I RE>> can find when rt_ifmsg is called are: RE>> RE>> - interface goes up (if_route) RE>> - interface goes down (if_unroute) RE>> - change MTU (if_hwioctl) RE>> - prom. mode (ifpromisc) RE>> - allmulti (if_allmulti) RE>> RE>> No one seems to call it when I just create an interface. The RTM_IFINFO RE>> when I delete it probably comes from the if_unroute. The RTM_IFINFO you RE>> see for an ifconfig gif0 create is probably a side effect of setting the RE>> MTU or so. RE>> RE>> I think it would make sense to do an rt_ifmsg somehere in RE>> if_attach/if_detach. RE>> RE>OK, I will send a patch within an hour or so. NetBSD already RE>has something to address this. I just had a look at this and, yes, that's what I mean. Just one question: is there any locking that does a user process prevent from seeing the interface still on the interface list after the message is sent, but before the interface is removed from the list? (I mean on an SMP system). The DEPARTURE message is sent before the interface is unlinked from the list. thanks for your help, harti -- harti brandt, http://www.fokus.gmd.de/research/cc/cats/employees/hartmut.brandt/private brandt@fokus.fhg.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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