if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL)
ether_output(ifp, m0, dst, rt0)	register struct ifnet *ifp;	struct mbuf *m0;	struct sockaddr *dst;	struct rtentry *rt0;{	u_int16_t etype;	int s, len, error = 0, hdrcmplt = 0; 	u_char edst[ETHER_ADDR_LEN], esrc[ETHER_ADDR_LEN];	register struct mbuf *m = m0;	register struct rtentry *rt;	struct mbuf *mcopy = (struct mbuf *)0;	register struct ether_header *eh;	struct arpcom *ac = (struct arpcom *)ifp;	short mflags;	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))		senderr(ENETDOWN);	if ((rt = rt0) != NULL) {		if ((rt->rt_flags & RTF_UP) == 0) {			if ((rt0 = rt = rtalloc1(dst, 1)) != NULL)				rt->rt_refcnt--;			else				senderr(EHOSTUNREACH);		}		if (rt->rt_flags & RTF_GATEWAY) {			if (rt->rt_gwroute == 0)				goto lookup;			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {				rtfree(rt); rt = rt0;			lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);				if ((rt = rt->rt_gwroute) == 0)					senderr(EHOSTUNREACH);			}		}		if (rt->rt_flags & RTF_REJECT)			if (rt->rt_rmx.rmx_expire == 0 ||			    time.tv_sec < rt->rt_rmx.rmx_expire)				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);	}	switch (dst->sa_family) {#ifdef INET	case AF_INET:		if (!arpresolve(ac, rt, m, dst, edst))			return (0);	/* if not yet resolved */		/* If broadcasting on a simplex interface, loopback a copy */		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))			mcopy = m_copy(m, 0, (int)M_COPYALL);		etype = htons(ETHERTYPE_IP);		break;#endif#ifdef INET6	case AF_INET6:		if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst))			return (0); /* it must be impossible, but... */		etype = htons(ETHERTYPE_IPV6);		break;#endif#ifdef NS	case AF_NS:		etype = htons(ETHERTYPE_NS); 		bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),		    (caddr_t)edst, sizeof (edst));		if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst)))			return (looutput(ifp, m, dst, rt));		/* If broadcasting on a simplex interface, loopback a copy */		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))			mcopy = m_copy(m, 0, (int)M_COPYALL);		break;#endif#ifdef IPX	case AF_IPX:		etype = htons(ETHERTYPE_IPX); 		bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host,		    (caddr_t)edst, sizeof (edst));		/* If broadcasting on a simplex interface, loopback a copy */		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))			mcopy = m_copy(m, 0, (int)M_COPYALL);		break;#endif#if 0	/*NRL INET6*/	case AF_INET6:		/*		 * The bottom line here is to either queue the outgoing packet		 * in the discovery engine, or fill in edst with something		 * that'll work.		 */		if (m->m_flags & M_MCAST) {			/*			 * If multicast dest., then use IPv6 -> Ethernet			 * mcast mapping.  Really simple.			 */			ETHER_MAP_IPV6_MULTICAST(&((struct sockaddr_in6 *)dst)->sin6_addr,			    edst);		} else {			/* Do unicast neighbor discovery stuff. */			if (!ipv6_discov_resolve(ifp, rt, m, dst, edst))				return 0;		}		etype = htons(ETHERTYPE_IPV6);		break;#endif /* INET6 */#ifdef NETATALK	case AF_APPLETALK: {		struct at_ifaddr *aa;		if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) {#ifdef NETATALKDEBUG			extern char *prsockaddr(struct sockaddr *);			printf("aarpresolv: failed for %s\n", prsockaddr(dst));#endif /* NETATALKDEBUG */			return (0);		}		/*		 * ifaddr is the first thing in at_ifaddr		 */		aa = (struct at_ifaddr *)at_ifawithnet(			(struct sockaddr_at *)dst,			TAILQ_FIRST(&ifp->if_addrlist));		if (aa == 0)			goto bad;		/*		 * In the phase 2 case, we need to prepend an mbuf for the llc		 * header. Since we must preserve the value of m, which is		 * passed to us by value, we m_copy() the first mbuf,		 * and use it for our llc header.		 */		if (aa->aa_flags & AFA_PHASE2) {			struct llc llc;			M_PREPEND(m, AT_LLC_SIZE, M_DONTWAIT);			if (m == NULL)				return (0);			/*			 * FreeBSD doesn't count the LLC len in			 * ifp->obytes, so they increment a length			 * field here. We don't do this.			 */			llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;			llc.llc_control = LLC_UI;			bcopy(at_org_code, llc.llc_snap.org_code,				sizeof(at_org_code));			llc.llc_snap.ether_type = htons( ETHERTYPE_AT );			bcopy(&llc, mtod(m, caddr_t), AT_LLC_SIZE);			etype = htons(m->m_pkthdr.len);		} else {			etype = htons(ETHERTYPE_AT);		}		} break;#endif /* NETATALK */#ifdef	ISO	case AF_ISO: {		int	snpalen;		struct	llc *l;		register struct sockaddr_dl *sdl;		if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&		    sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {			bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));		} else {			error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst,						(char *)edst, &snpalen);			if (error)				goto bad; /* Not Resolved */		}		/* If broadcasting on a simplex interface, loopback a copy */		if (*edst & 1)			m->m_flags |= (M_BCAST|M_MCAST);		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&		    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {			M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);			if (mcopy) {				eh = mtod(mcopy, struct ether_header *);				bcopy(edst, eh->ether_dhost, sizeof (edst));				bcopy(ac->ac_enaddr, eh->ether_shost,				    sizeof (edst));			}		}		M_PREPEND(m, 3, M_DONTWAIT);		if (m == NULL)			return (0);		etype = htons(m->m_pkthdr.len);		l = mtod(m, struct llc *);		l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;		l->llc_control = LLC_UI;#ifdef ARGO_DEBUG		if (argo_debug[D_ETHER]) {			int i;			printf("unoutput: sending pkt to: ");			for (i=0; i < ETHER_ADDR_LEN; i++)				printf("%x ", edst[i] & 0xff);			printf("\n");		}#endif		} break;#endif /* ISO *//*	case AF_NSAP: */	case AF_CCITT: {		register struct sockaddr_dl *sdl =			(struct sockaddr_dl *) rt -> rt_gateway;		if (sdl && sdl->sdl_family == AF_LINK		    && sdl->sdl_alen > 0) {			bcopy(LLADDR(sdl), (char *)edst,				sizeof(edst));		} else goto bad; /* Not a link interface ? Funny ... */		if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) &&		    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {			M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);			if (mcopy) {				eh = mtod(mcopy, struct ether_header *);				bcopy(edst, eh->ether_dhost, sizeof (edst));				bcopy(ac->ac_enaddr, eh->ether_shost,				    sizeof (edst));			}		}		etype = htons(m->m_pkthdr.len);#ifdef LLC_DEBUG		{			int i;			register struct llc *l = mtod(m, struct llc *);			printf("ether_output: sending LLC2 pkt to: ");			for (i=0; i < ETHER_ADDR_LEN; i++)				printf("%x ", edst[i] & 0xff);			printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n",			    m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff,			    l->llc_control & 0xff);		}#endif /* LLC_DEBUG */		} break;	case pseudo_AF_HDRCMPLT:		hdrcmplt = 1;		eh = (struct ether_header *)dst->sa_data;		bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc));		/* FALLTHROUGH */	case AF_UNSPEC:		eh = (struct ether_header *)dst->sa_data; 		bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));		/* AF_UNSPEC doesn't swap the byte order of the ether_type. */		etype = eh->ether_type;		break;	default:		printf("%s: can't handle af%d\n", ifp->if_xname,			dst->sa_family);		senderr(EAFNOSUPPORT);	}	/* XXX Should we feed-back an unencrypted IPsec packet ? */	if (mcopy)		(void) looutput(ifp, mcopy, dst, rt);	/*	 * Add local net header.  If no space in first mbuf,	 * allocate another.	 */	M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);	if (m == 0)		senderr(ENOBUFS);	eh = mtod(m, struct ether_header *);	bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type,		sizeof(eh->ether_type)); 	bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));	if (hdrcmplt)	 	bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost,		    sizeof(eh->ether_shost));	else	 	bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,		    sizeof(eh->ether_shost));#if NBRIDGE > 0	/*	 * Interfaces that are bridge members need special handling	 * for output.	 */	if (ifp->if_bridge) {		struct m_tag *mtag;		/*		 * Check if this packet has already been sent out through		 * this bridge, in which case we simply send it out		 * without further bridge processing.		 */		for (mtag = m_tag_find(m, PACKET_TAG_BRIDGE, NULL); mtag;		    mtag = m_tag_find(m, PACKET_TAG_BRIDGE, mtag)) {#ifdef DEBUG			/* Check that the information is there */			if (mtag->m_tag_len != sizeof(caddr_t)) {				error = EINVAL;				goto bad;			}#endif			if (!bcmp(&ifp->if_bridge, mtag + 1, sizeof(caddr_t)))				break;		}		if (mtag == NULL) {			/* Attach a tag so we can detect loops */			mtag = m_tag_get(PACKET_TAG_BRIDGE, sizeof(caddr_t),			    M_NOWAIT);			if (mtag == NULL) {				error = ENOBUFS;				goto bad;			}			bcopy(&ifp->if_bridge, mtag + 1, sizeof(caddr_t));			m_tag_prepend(m, mtag);			bridge_output(ifp, m, NULL, NULL);			return (error);		}	}#endif	mflags = m->m_flags;	len = m->m_pkthdr.len;	s = splimp();	/*	 * Queue message on interface, and start output if interface	 * not yet active.	 */	IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);	if (error) {		/* mbuf is already freed */		splx(s);		return (error);	}	ifp->if_obytes += len + sizeof (struct ether_header);	if (mflags & M_MCAST)		ifp->if_omcasts++;	if ((ifp->if_flags & IFF_OACTIVE) == 0)		(*ifp->if_start)(ifp);	splx(s);	return (error);bad:	if (m)		m_freem(m);	return (error);}