Function nd6_llinfo_timer

freebsd/netinet6/nd6.c:737–914

* Timer-dependent part of nd state machine. * * Set noinline to be dtrace-friendly */

 * Set noinline to be dtrace-friendly
 */
static __noinline void
nd6_llinfo_timer(void *arg)
{
	struct epoch_tracker et;
	struct llentry *ln;
	struct in6_addr *dst, *pdst, *psrc, src;
	struct ifnet *ifp;
	struct nd_ifinfo *ndi;
	int do_switch, send_ns;
	long delay;

	KASSERT(arg != NULL, ("%s: arg NULL", __func__));
	ln = (struct llentry *)arg;
	ifp = lltable_get_ifp(ln->lle_tbl);
	CURVNET_SET(ifp->if_vnet);

	ND6_RLOCK();
	LLE_WLOCK(ln);
	if (callout_pending(&ln->lle_timer)) {
		/*
		 * Here we are a bit odd here in the treatment of 
		 * active/pending. If the pending bit is set, it got
		 * rescheduled before I ran. The active
		 * bit we ignore, since if it was stopped
		 * in ll_tablefree() and was currently running
		 * it would have return 0 so the code would
		 * not have deleted it since the callout could
		 * not be stopped so we want to go through
		 * with the delete here now. If the callout
		 * was restarted, the pending bit will be back on and
		 * we just want to bail since the callout_reset would
		 * return 1 and our reference would have been removed
		 * by nd6_llinfo_settimer_locked above since canceled
		 * would have been 1.
		 */
		LLE_WUNLOCK(ln);
		ND6_RUNLOCK();
		CURVNET_RESTORE();
		return;
	}
	NET_EPOCH_ENTER(et);
	ndi = ND_IFINFO(ifp);
	send_ns = 0;
	dst = &ln->r_l3addr.addr6;
	pdst = dst;

	if (ln->ln_ntick > 0) {
		if (ln->ln_ntick > INT_MAX) {
			ln->ln_ntick -= INT_MAX;
			nd6_llinfo_settimer_locked(ln, INT_MAX);
		} else {
			ln->ln_ntick = 0;
			nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
		}
		goto done;
	}

	if (ln->la_flags & LLE_STATIC) {