Function bpfdetach

freebsd/net/bpf.c:2745–2776

* Detach bpf from an interface. This involves detaching each descriptor * associated with the interface. Notify each descriptor as it's detached * so that any sleepers wake up and get ENXIO. */

 * so that any sleepers wake up and get ENXIO.
 */
void
bpfdetach(struct ifnet *ifp)
{
	struct bpf_if *bp, *bp_temp;
	struct bpf_d *d;

	BPF_LOCK();
	/* Find all bpf_if struct's which reference ifp and detach them. */
	CK_LIST_FOREACH_SAFE(bp, &bpf_iflist, bif_next, bp_temp) {
		if (ifp != bp->bif_ifp)
			continue;

		CK_LIST_REMOVE(bp, bif_next);
		*bp->bif_bpf = (struct bpf_if *)&dead_bpf_if;

		CTR4(KTR_NET,
		    "%s: sheduling free for encap %d (%p) for if %p",
		    __func__, bp->bif_dlt, bp, ifp);

		/* Detach common descriptors */
		while ((d = CK_LIST_FIRST(&bp->bif_dlist)) != NULL) {
			bpf_detachd_locked(d, true);
		}

		/* Detach writer-only descriptors */
		while ((d = CK_LIST_FIRST(&bp->bif_wlist)) != NULL) {
			bpf_detachd_locked(d, true);
		}
		bpfif_rele(bp);
	}
	BPF_UNLOCK();
}

/*
 * Get a list of available data link type of the interface.