Steve Langasek <vorlon@debian.org> (04/11/2012): > Is there a way to get an event-based notification of this change, so > ifupdown can listen for such an event rather than having to poll? TL;DR: I think so. <disclaimer>I don't know anything about the linux kernel</disclaimer> Looking at net/ipv6/addrconf.c we have for examples: add_addr() addrconf_dad_start() doing things like: ifp->flags &= ~IFA_F_TENTATIVE; ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); It looks like ipv6_ifa_notify() is called upon changes. That one ends up calling inet6_ifa_notify(), which has things like struct sk_buff, nlmsg_new(), rtnl_notify(). The last one is defined in net/core/rtnetlink.c; it looks like somebody wants to hook oneself up onto a netlink socket from userspace. Mraw, KiBi.
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