Function me_set_tunnel

freebsd/net/if_me.c:403–435

}

static int
me_set_tunnel(struct me_softc *sc, in_addr_t src, in_addr_t dst)
{
	struct me_softc *tmp;

	sx_assert(&me_ioctl_sx, SA_XLOCKED);

	if (V_me_hashtbl == NULL) {
		V_me_hashtbl = me_hashinit();
		V_me_srchashtbl = me_hashinit();
	}

	if (sc->me_src.s_addr == src && sc->me_dst.s_addr == dst)
		return (0);

	CK_LIST_FOREACH(tmp, &ME_HASH(src, dst), chain) {
		if (tmp == sc)
			continue;
		if (tmp->me_src.s_addr == src &&
		    tmp->me_dst.s_addr == dst)
			return (EADDRNOTAVAIL);
	}

	me_delete_tunnel(sc);
	sc->me_dst.s_addr = dst;
	sc->me_src.s_addr = src;
	CK_LIST_INSERT_HEAD(&ME_HASH(src, dst), sc, chain);
	CK_LIST_INSERT_HEAD(&ME_SRCHASH(src), sc, srchash);

	me_set_running(sc);
	if_link_state_change(ME2IFP(sc), LINK_STATE_UP);
	return (0);
}

static void
me_delete_tunnel(struct me_softc *sc)