+/*
+ * Mark an interface down and notify protocols of
+ * the transition.
+ * NOTE: must be called at splnet or eqivalent.
+ */
+if_down(ifp)
+ register struct ifnet *ifp;
+{
+
+ ifp->if_flags &= ~IFF_UP;
+ pfctlinput(PRC_IFDOWN, (caddr_t)&ifp->if_addr);
+}
+
+/*
+ * Handle interface watchdog timer routines. Called
+ * from softclock, we decrement timers (if set) and
+ * call the appropriate interface routine on expiration.
+ */
+if_slowtimo()
+{
+ register struct ifnet *ifp;
+
+ for (ifp = ifnet; ifp; ifp = ifp->if_next) {
+ if (ifp->if_timer == 0 || --ifp->if_timer)
+ continue;
+ if (ifp->if_watchdog)
+ (*ifp->if_watchdog)(ifp->if_unit);
+ }
+ timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ);
+}
+
+/*
+ * Map interface name to
+ * interface structure pointer.
+ */
+struct ifnet *
+ifunit(name)
+ register char *name;
+{
+ register char *cp;
+ register struct ifnet *ifp;
+ int unit;
+
+ for (cp = name; cp < name + IFNAMSIZ && *cp; cp++)
+ if (*cp >= '0' && *cp <= '9')
+ break;
+ if (*cp == '\0' || cp == name + IFNAMSIZ)
+ return ((struct ifnet *)0);
+ unit = *cp - '0', *cp = 0;
+ for (ifp = ifnet; ifp; ifp = ifp->if_next) {
+ if (bcmp(ifp->if_name, name, (unsigned)(cp - name)))
+ continue;
+ if (unit == ifp->if_unit)
+ break;
+ }
+ return (ifp);
+}
+
+/*
+ * Interface ioctls.
+ */
+ifioctl(cmd, data)
+ int cmd;
+ caddr_t data;
+{
+ register struct ifnet *ifp;
+ register struct ifreq *ifr;
+
+ switch (cmd) {
+
+ case SIOCGIFCONF:
+ return (ifconf(cmd, data));
+
+ case SIOCSIFADDR:
+ case SIOCSIFFLAGS:
+ case SIOCSIFDSTADDR:
+ if (!suser())
+ return (u.u_error);
+ break;
+ }
+ ifr = (struct ifreq *)data;
+ ifp = ifunit(ifr->ifr_name);
+ if (ifp == 0)
+ return (ENXIO);
+ switch (cmd) {
+
+ case SIOCGIFADDR:
+ ifr->ifr_addr = ifp->if_addr;
+ break;
+
+ case SIOCGIFDSTADDR:
+ if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
+ return (EINVAL);
+ ifr->ifr_dstaddr = ifp->if_dstaddr;
+ break;
+
+ case SIOCGIFFLAGS:
+ ifr->ifr_flags = ifp->if_flags;
+ break;
+
+ case SIOCSIFFLAGS:
+ if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
+ int s = splimp();
+ if_down(ifp);
+ splx(s);
+ }
+ ifp->if_flags = ifr->ifr_flags;
+ break;
+
+ default:
+ if (ifp->if_ioctl == 0)
+ return (EOPNOTSUPP);
+ return ((*ifp->if_ioctl)(ifp, cmd, data));
+ }