+/*
+ * Process an ioctl request.
+ */
+vvioctl(ifp, cmd, data)
+ register struct ifnet *ifp;
+ int cmd;
+ caddr_t data;
+{
+ register struct ifreq *ifr;
+ register int s;
+ int error;
+
+ ifr = (struct ifreq *)data;
+ error = 0;
+ s = splimp();
+ switch (cmd) {
+
+ case SIOCSIFADDR:
+ if (ifp->if_flags & IFF_RUNNING)
+ if_rtinit(ifp, -1); /* delete previous route */
+ vvsetaddr(ifp, (struct sockaddr_in *)&ifr->ifr_addr);
+ if (ifp->if_flags & IFF_RUNNING)
+ if_rtinit(ifp, RTF_UP);
+ else
+ vvinit(ifp->if_unit);
+ break;
+
+ default:
+ error = EINVAL;
+ }
+ splx(s);
+ return(error);
+}
+
+/*
+ * Set up the address for this interface. We use the network number
+ * from the passed address and an invalid host number; vvinit() will
+ * figure out the host number and insert it later.
+ */
+vvsetaddr(ifp, sin)
+ register struct ifnet *ifp;
+ register struct sockaddr_in *sin;
+{
+ ifp->if_net = in_netof(sin->sin_addr);
+ ifp->if_host[0] = 256; /* an invalid host number */
+ sin = (struct sockaddr_in *)&ifp->if_addr;
+ sin->sin_family = AF_INET;
+ sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]);
+ sin = (struct sockaddr_in *)&ifp->if_broadaddr;
+ sin->sin_family = AF_INET;
+ sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
+ ifp->if_flags |= IFF_BROADCAST;
+}
+