/* *  $Id: ether_mod.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $ * *  libnet *  FreeBSD ether_mod.c - lkm replacement for ether_output * *  Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com> *  Original code and idea 1997 Thomas Ptacek <tqbf@pobox.com> *  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */#define INET#include <sys/param.h>#include <sys/systm.h>#include <sys/kernel.h>#include <sys/malloc.h>#include <sys/mbuf.h>#include <sys/protosw.h>#include <sys/socket.h>#include <sys/sockio.h>#include <sys/errno.h>#include <sys/syslog.h>#include <sys/sysctl.h>#include <net/if.h>#include <net/netisr.h>#include <net/route.h>#include <net/if_llc.h>#include <net/if_dl.h>#include <net/if_types.h>#include <net/ethernet.h>#ifdef INET#include <netinet/in.h>#include <netinet/in_var.h>#endif#include <netinet/if_ether.h>#ifdef IPX#include <netipx/ipx.h>#include <netipx/ipx_if.h>#endif#ifdef NS#include <netns/ns.h>#include <netns/ns_if.h>ushort ns_nettype;int ether_outputdebug = 0;int ether_inputdebug = 0;#endif#ifdef ISO#include <netiso/argo_debug.h>#include <netiso/iso.h>#include <netiso/iso_var.h>#include <netiso/iso_snpac.h>#endif/*#ifdef LLC#include <netccitt/dll.h>#include <netccitt/llc_var.h>#endif*/#if defined(LLC) && defined(CCITT)extern struct ifqueue pkintrq;#endif#ifdef NETATALK#include <netatalk/at.h>#include <netatalk/at_var.h>#include <netatalk/at_extern.h>#define llc_snap_org_code llc_un.type_snap.org_code#define llc_snap_ether_type llc_un.type_snap.ether_typeextern u_char	at_org_code[ 3 ];extern u_char	aarp_org_code[ 3 ];#endif NETATALK#define senderr(e) { error = (e); goto bad;}int ether_output_spoof(register struct ifnet *, struct mbuf *, 			struct sockaddr *, struct rtentry *);intether_output_spoof(ifp, m0, dst, rt0)	register struct ifnet *ifp;	struct mbuf *m0;	struct sockaddr *dst;	struct rtentry *rt0;{	short type;	int s, error = 0; 	u_char *cp, edst[6], esrc[6];	register struct mbuf *m2, *m = m0;	register struct rtentry *rt;	struct mbuf *mcopy = (struct mbuf *)0;	register struct ether_header *eh;	int off, len = m->m_pkthdr.len;	struct arpcom *ac = (struct arpcom *)ifp;	register struct ifqueue *inq;#ifdef NETATALK	struct at_ifaddr *aa;#endif NETATALK	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))		senderr(ENETDOWN);	rt = rt0;	if (rt) {		if ((rt->rt_flags & RTF_UP) == 0) {			rt0 = rt = rtalloc1(dst, 1, 0UL);			if (rt0)				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,							  0UL);				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, rt0))			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);		off = m->m_pkthdr.len - m->m_len;		type = htons(ETHERTYPE_IP);		break;#endif#ifdef IPX	case AF_IPX:		{		struct ifaddr *ia;		type = htons(ETHERTYPE_IPX); 		bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),		    (caddr_t)edst, sizeof (edst));		for(ia = ifp->if_addrhead.tqh_first; ia != 0;		    ia = ia->ifa_link.tqe_next) {			if(ia->ifa_addr->sa_family == AF_IPX &&			    !bcmp((caddr_t)edst,				  (caddr_t)&((struct ipx_ifaddr *)ia)->ia_addr.sipx_addr.x_host,				  sizeof(edst)) )				return (/*looutput(ifp, m, dst, rt)*/1);			}		/* 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 NETATALK	case AF_APPLETALK:            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	     */	    if ((aa = (struct at_ifaddr *)at_ifawithnet(			(struct sockaddr_at *)dst, &ifp->if_addrhead))		== 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, sizeof(struct llc), M_WAIT);		len += sizeof(struct llc);		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), sizeof(struct llc));		type = htons(m->m_pkthdr.len);	    } else {		type = htons(ETHERTYPE_AT);	    }	    break;#endif NETATALK#ifdef NS	case AF_NS:		switch(ns_nettype){		default:		case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */			type = 0x8137;			break;		case 0x0: /* Novell 802.3 */			type = htons( m->m_pkthdr.len);			break;		case 0xe0e0: /* Novell 802.2 and Token-Ring */			M_PREPEND(m, 3, M_WAIT);			type = htons( m->m_pkthdr.len);			cp = mtod(m, u_char *);			*cp++ = 0xE0;			*cp++ = 0xE0;			*cp++ = 0x03;			break;		} 		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))){			m->m_pkthdr.rcvif = ifp;			schednetisr(NETISR_NS);			inq = &nsintrq;			s = splimp();			if (IF_QFULL(inq)) {				IF_DROP(inq);				m_freem(m);			} else				IF_ENQUEUE(inq, m);			splx(s);			return (error);		}		if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){			m2 = m_copy(m, 0, (int)M_COPYALL);			m2->m_pkthdr.rcvif = ifp;			schednetisr(NETISR_NS);			inq = &nsintrq;			s = splimp();			if (IF_QFULL(inq)) {				IF_DROP(inq);				m_freem(m2);			} else				IF_ENQUEUE(inq, m2);			splx(s);		}		/* 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 /* NS */#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 if (error =			    iso_snparesolve(ifp, (struct sockaddr_iso *)dst,					    (char *)edst, &snpalen))			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((caddr_t)edst,				      (caddr_t)eh->ether_dhost, sizeof (edst));				bcopy((caddr_t)ac->ac_enaddr,				      (caddr_t)eh->ether_shost, sizeof (edst));			}		}		M_PREPEND(m, 3, M_DONTWAIT);		if (m == NULL)			return (0);		type = htons(m->m_pkthdr.len);		l = mtod(m, struct llc *);		l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;		l->llc_control = LLC_UI;		len += 3;		IFDEBUG(D_ETHER)			int i;			printf("unoutput: sending pkt to: ");			for (i=0; i<6; i++)				printf("%x ", edst[i] & 0xff);			printf("\n");		ENDDEBUG		} break;#endif /* ISO */#ifdef	LLC/*	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((caddr_t)edst,				      (caddr_t)eh->ether_dhost, sizeof (edst));				bcopy((caddr_t)ac->ac_enaddr,				      (caddr_t)eh->ether_shost, sizeof (edst));			}		}		type = 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<6; i++)				printf("%x ", edst[i] & 0xff);			printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n",			       type & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff,			       l->llc_control & 0xff);		}#endif /* LLC_DEBUG */		} break;#endif /* LLC */	case AF_UNSPEC:		/* XXX */		eh = (struct ether_header *)dst->sa_data; 		(void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 		(void)memcpy(esrc, eh->ether_shost, sizeof (esrc));		type = eh->ether_type;		break;	default:		printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,			dst->sa_family);		senderr(EAFNOSUPPORT);	}/*	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 *);	(void)memcpy(&eh->ether_type, &type,		sizeof(eh->ether_type)); 	(void)memcpy(eh->ether_dhost, edst, sizeof (edst));        (void)memcpy(eh->ether_shost, esrc, sizeof (esrc));	s = splimp();	/*	 * Queue message on interface, and start output if interface	 * not yet active.	 */	if (IF_QFULL(&ifp->if_snd)) {		IF_DROP(&ifp->if_snd);		splx(s);		senderr(ENOBUFS);	}	IF_ENQUEUE(&ifp->if_snd, m);	if ((ifp->if_flags & IFF_OACTIVE) == 0)		(*ifp->if_start)(ifp);	splx(s);	ifp->if_obytes += len + sizeof (struct ether_header);	if (m->m_flags & M_MCAST)		ifp->if_omcasts++;	return (error);bad:	if (m)		m_freem(m);	return (error);}