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if_ethersubr.c revision 1.143
      1 /*	$NetBSD: if_ethersubr.c,v 1.143 2007/01/27 07:12:16 cbiere Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the project nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 1982, 1989, 1993
     34  *	The Regents of the University of California.  All rights reserved.
     35  *
     36  * Redistribution and use in source and binary forms, with or without
     37  * modification, are permitted provided that the following conditions
     38  * are met:
     39  * 1. Redistributions of source code must retain the above copyright
     40  *    notice, this list of conditions and the following disclaimer.
     41  * 2. Redistributions in binary form must reproduce the above copyright
     42  *    notice, this list of conditions and the following disclaimer in the
     43  *    documentation and/or other materials provided with the distribution.
     44  * 3. Neither the name of the University nor the names of its contributors
     45  *    may be used to endorse or promote products derived from this software
     46  *    without specific prior written permission.
     47  *
     48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     58  * SUCH DAMAGE.
     59  *
     60  *	@(#)if_ethersubr.c	8.2 (Berkeley) 4/4/96
     61  */
     62 
     63 #include <sys/cdefs.h>
     64 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.143 2007/01/27 07:12:16 cbiere Exp $");
     65 
     66 #include "opt_inet.h"
     67 #include "opt_atalk.h"
     68 #include "opt_iso.h"
     69 #include "opt_ipx.h"
     70 #include "opt_mbuftrace.h"
     71 #include "opt_gateway.h"
     72 #include "opt_pfil_hooks.h"
     73 #include "opt_pppoe.h"
     74 #include "vlan.h"
     75 #include "pppoe.h"
     76 #include "bridge.h"
     77 #include "bpfilter.h"
     78 #include "arp.h"
     79 #include "agr.h"
     80 
     81 #include <sys/param.h>
     82 #include <sys/systm.h>
     83 #include <sys/kernel.h>
     84 #include <sys/callout.h>
     85 #include <sys/malloc.h>
     86 #include <sys/mbuf.h>
     87 #include <sys/protosw.h>
     88 #include <sys/socket.h>
     89 #include <sys/ioctl.h>
     90 #include <sys/errno.h>
     91 #include <sys/syslog.h>
     92 #include <sys/kauth.h>
     93 
     94 #include <machine/cpu.h>
     95 
     96 #include <net/if.h>
     97 #include <net/netisr.h>
     98 #include <net/route.h>
     99 #include <net/if_llc.h>
    100 #include <net/if_dl.h>
    101 #include <net/if_types.h>
    102 
    103 #if NARP == 0
    104 /*
    105  * XXX there should really be a way to issue this warning from within config(8)
    106  */
    107 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK.
    108 #endif
    109 
    110 #if NBPFILTER > 0
    111 #include <net/bpf.h>
    112 #endif
    113 
    114 #include <net/if_ether.h>
    115 #if NVLAN > 0
    116 #include <net/if_vlanvar.h>
    117 #endif
    118 
    119 #if NPPPOE > 0
    120 #include <net/if_pppoe.h>
    121 #endif
    122 
    123 #if NAGR > 0
    124 #include <net/agr/ieee8023_slowprotocols.h>	/* XXX */
    125 #include <net/agr/ieee8023ad.h>
    126 #include <net/agr/if_agrvar.h>
    127 #endif
    128 
    129 #if NBRIDGE > 0
    130 #include <net/if_bridgevar.h>
    131 #endif
    132 
    133 #include <netinet/in.h>
    134 #ifdef INET
    135 #include <netinet/in_var.h>
    136 #endif
    137 #include <netinet/if_inarp.h>
    138 
    139 #ifdef INET6
    140 #ifndef INET
    141 #include <netinet/in.h>
    142 #endif
    143 #include <netinet6/in6_var.h>
    144 #include <netinet6/nd6.h>
    145 #endif
    146 
    147 
    148 #include "carp.h"
    149 #if NCARP > 0
    150 #include <netinet/ip_carp.h>
    151 #endif
    152 
    153 #ifdef IPX
    154 #include <netipx/ipx.h>
    155 #include <netipx/ipx_if.h>
    156 #endif
    157 
    158 #ifdef ISO
    159 #include <netiso/argo_debug.h>
    160 #include <netiso/iso.h>
    161 #include <netiso/iso_var.h>
    162 #include <netiso/iso_snpac.h>
    163 #endif
    164 
    165 
    166 
    167 #ifdef NETATALK
    168 #include <netatalk/at.h>
    169 #include <netatalk/at_var.h>
    170 #include <netatalk/at_extern.h>
    171 
    172 #define llc_snap_org_code llc_un.type_snap.org_code
    173 #define llc_snap_ether_type llc_un.type_snap.ether_type
    174 
    175 extern u_char	at_org_code[3];
    176 extern u_char	aarp_org_code[3];
    177 #endif /* NETATALK */
    178 
    179 static struct timeval bigpktppslim_last;
    180 static int bigpktppslim = 2;	/* XXX */
    181 static int bigpktpps_count;
    182 
    183 
    184 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] =
    185     { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
    186 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
    187     { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
    188 #define senderr(e) { error = (e); goto bad;}
    189 
    190 #define SIN(x) ((struct sockaddr_in *)x)
    191 
    192 static	int ether_output(struct ifnet *, struct mbuf *,
    193 	    struct sockaddr *, struct rtentry *);
    194 
    195 /*
    196  * Ethernet output routine.
    197  * Encapsulate a packet of type family for the local net.
    198  * Assumes that ifp is actually pointer to ethercom structure.
    199  */
    200 static int
    201 ether_output(struct ifnet *ifp0, struct mbuf *m0, struct sockaddr *dst,
    202 	struct rtentry *rt0)
    203 {
    204 	u_int16_t etype = 0;
    205 	int error = 0, hdrcmplt = 0;
    206  	u_char esrc[6], edst[6];
    207 	struct mbuf *m = m0;
    208 	struct rtentry *rt;
    209 	struct mbuf *mcopy = (struct mbuf *)0;
    210 	struct ether_header *eh;
    211 	struct ifnet *ifp = ifp0;
    212 	ALTQ_DECL(struct altq_pktattr pktattr;)
    213 #ifdef INET
    214 	struct arphdr *ah;
    215 #endif /* INET */
    216 #ifdef NETATALK
    217 	struct at_ifaddr *aa;
    218 #endif /* NETATALK */
    219 
    220 #ifdef MBUFTRACE
    221 	m_claimm(m, ifp->if_mowner);
    222 #endif
    223 
    224 #if NCARP > 0
    225 	if (ifp->if_type == IFT_CARP) {
    226 		struct ifaddr *ifa;
    227 
    228 		/* loop back if this is going to the carp interface */
    229 		if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP &&
    230 		    (ifa = ifa_ifwithaddr(dst)) != NULL &&
    231 		    ifa->ifa_ifp == ifp0)
    232 			return (looutput(ifp0, m, dst, rt0));
    233 
    234 		ifp = ifp->if_carpdev;
    235 		/* ac = (struct arpcom *)ifp; */
    236 
    237 		if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
    238 		    (IFF_UP|IFF_RUNNING))
    239 			senderr(ENETDOWN);
    240 	}
    241 #endif /* NCARP > 0 */
    242 
    243 	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
    244 		senderr(ENETDOWN);
    245 	if ((rt = rt0) != NULL) {
    246 		if ((rt->rt_flags & RTF_UP) == 0) {
    247 			if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) {
    248 				rt->rt_refcnt--;
    249 				if (rt->rt_ifp != ifp)
    250 					return (*rt->rt_ifp->if_output)
    251 							(ifp, m0, dst, rt);
    252 			} else
    253 				senderr(EHOSTUNREACH);
    254 		}
    255 		if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) {
    256 			if (rt->rt_gwroute == 0)
    257 				goto lookup;
    258 			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
    259 				rtfree(rt); rt = rt0;
    260 			lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
    261 				if ((rt = rt->rt_gwroute) == 0)
    262 					senderr(EHOSTUNREACH);
    263 				/* the "G" test below also prevents rt == rt0 */
    264 				if ((rt->rt_flags & RTF_GATEWAY) ||
    265 				    (rt->rt_ifp != ifp)) {
    266 					rt->rt_refcnt--;
    267 					rt0->rt_gwroute = 0;
    268 					senderr(EHOSTUNREACH);
    269 				}
    270 			}
    271 		}
    272 		if (rt->rt_flags & RTF_REJECT)
    273 			if (rt->rt_rmx.rmx_expire == 0 ||
    274 			    (u_long) time_second < rt->rt_rmx.rmx_expire)
    275 				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
    276 	}
    277 
    278 	switch (dst->sa_family) {
    279 
    280 #ifdef INET
    281 	case AF_INET:
    282 		if (m->m_flags & M_BCAST)
    283                 	(void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
    284 
    285 		else if (m->m_flags & M_MCAST) {
    286 			ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr,
    287 			    (caddr_t)edst)
    288 
    289 		} else if (!arpresolve(ifp, rt, m, dst, edst))
    290 			return (0);	/* if not yet resolved */
    291 		/* If broadcasting on a simplex interface, loopback a copy */
    292 		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
    293 			mcopy = m_copy(m, 0, (int)M_COPYALL);
    294 		etype = htons(ETHERTYPE_IP);
    295 		break;
    296 
    297 	case AF_ARP:
    298 		ah = mtod(m, struct arphdr *);
    299 		if (m->m_flags & M_BCAST)
    300                 	(void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
    301 		else {
    302 			caddr_t tha = ar_tha(ah);
    303 
    304 			KASSERT(tha);
    305 			bcopy(tha, (caddr_t)edst, sizeof(edst));
    306 		}
    307 
    308 		ah->ar_hrd = htons(ARPHRD_ETHER);
    309 
    310 		switch (ntohs(ah->ar_op)) {
    311 		case ARPOP_REVREQUEST:
    312 		case ARPOP_REVREPLY:
    313 			etype = htons(ETHERTYPE_REVARP);
    314 			break;
    315 
    316 		case ARPOP_REQUEST:
    317 		case ARPOP_REPLY:
    318 		default:
    319 			etype = htons(ETHERTYPE_ARP);
    320 		}
    321 
    322 		break;
    323 #endif
    324 #ifdef INET6
    325 	case AF_INET6:
    326 		if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){
    327 			/* something bad happened */
    328 			return (0);
    329 		}
    330 		etype = htons(ETHERTYPE_IPV6);
    331 		break;
    332 #endif
    333 #ifdef NETATALK
    334     case AF_APPLETALK:
    335 		if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) {
    336 #ifdef NETATALKDEBUG
    337 			printf("aarpresolv failed\n");
    338 #endif /* NETATALKDEBUG */
    339 			return (0);
    340 		}
    341 		/*
    342 		 * ifaddr is the first thing in at_ifaddr
    343 		 */
    344 		aa = (struct at_ifaddr *) at_ifawithnet(
    345 		    (struct sockaddr_at *)dst, ifp);
    346 		if (aa == NULL)
    347 		    goto bad;
    348 
    349 		/*
    350 		 * In the phase 2 case, we need to prepend an mbuf for the
    351 		 * llc header.  Since we must preserve the value of m,
    352 		 * which is passed to us by value, we m_copy() the first
    353 		 * mbuf, and use it for our llc header.
    354 		 */
    355 		if (aa->aa_flags & AFA_PHASE2) {
    356 			struct llc llc;
    357 
    358 			M_PREPEND(m, sizeof(struct llc), M_DONTWAIT);
    359 			llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
    360 			llc.llc_control = LLC_UI;
    361 			bcopy(at_org_code, llc.llc_snap_org_code,
    362 			    sizeof(llc.llc_snap_org_code));
    363 			llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
    364 			bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
    365 		} else {
    366 			etype = htons(ETHERTYPE_ATALK);
    367 		}
    368 		break;
    369 #endif /* NETATALK */
    370 #ifdef IPX
    371 	case AF_IPX:
    372 		etype = htons(ETHERTYPE_IPX);
    373  		bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
    374 		    (caddr_t)edst, sizeof (edst));
    375 		/* If broadcasting on a simplex interface, loopback a copy */
    376 		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
    377 			mcopy = m_copy(m, 0, (int)M_COPYALL);
    378 		break;
    379 #endif
    380 #ifdef	ISO
    381 	case AF_ISO: {
    382 		int	snpalen;
    383 		struct	llc *l;
    384 		struct sockaddr_dl *sdl;
    385 
    386 		if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
    387 		    sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
    388 			bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
    389 		} else {
    390 			error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
    391 						(char *)edst, &snpalen);
    392 			if (error)
    393 				goto bad; /* Not Resolved */
    394 		}
    395 		/* If broadcasting on a simplex interface, loopback a copy */
    396 		if (*edst & 1)
    397 			m->m_flags |= (M_BCAST|M_MCAST);
    398 		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
    399 		    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {
    400 			M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
    401 			if (mcopy) {
    402 				eh = mtod(mcopy, struct ether_header *);
    403 				bcopy((caddr_t)edst,
    404 				      (caddr_t)eh->ether_dhost, sizeof (edst));
    405 				bcopy(LLADDR(ifp->if_sadl),
    406 				      (caddr_t)eh->ether_shost, sizeof (edst));
    407 			}
    408 		}
    409 		M_PREPEND(m, 3, M_DONTWAIT);
    410 		if (m == NULL)
    411 			return (0);
    412 		l = mtod(m, struct llc *);
    413 		l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
    414 		l->llc_control = LLC_UI;
    415 #ifdef ARGO_DEBUG
    416 		if (argo_debug[D_ETHER]) {
    417 			int i;
    418 			printf("unoutput: sending pkt to: ");
    419 			for (i=0; i<6; i++)
    420 				printf("%x ", edst[i] & 0xff);
    421 			printf("\n");
    422 		}
    423 #endif
    424 		} break;
    425 #endif /* ISO */
    426 
    427 	case pseudo_AF_HDRCMPLT:
    428 		hdrcmplt = 1;
    429 		eh = (struct ether_header *)dst->sa_data;
    430 		bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc));
    431 		/* FALLTHROUGH */
    432 
    433 	case AF_UNSPEC:
    434 		eh = (struct ether_header *)dst->sa_data;
    435  		bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));
    436 		/* AF_UNSPEC doesn't swap the byte order of the ether_type. */
    437 		etype = eh->ether_type;
    438 		break;
    439 
    440 	default:
    441 		printf("%s: can't handle af%d\n", ifp->if_xname,
    442 			dst->sa_family);
    443 		senderr(EAFNOSUPPORT);
    444 	}
    445 
    446 	if (mcopy)
    447 		(void) looutput(ifp, mcopy, dst, rt);
    448 
    449 	/* If no ether type is set, this must be a 802.2 formatted packet.
    450 	 */
    451 	if (etype == 0)
    452 		etype = htons(m->m_pkthdr.len);
    453 	/*
    454 	 * Add local net header.  If no space in first mbuf,
    455 	 * allocate another.
    456 	 */
    457 	M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
    458 	if (m == 0)
    459 		senderr(ENOBUFS);
    460 	eh = mtod(m, struct ether_header *);
    461 	/* Note: etype is already in network byte order. */
    462 	(void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
    463  	bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));
    464 	if (hdrcmplt)
    465 		bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost,
    466 		    sizeof(eh->ether_shost));
    467 	else
    468 	 	bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost,
    469 		    sizeof(eh->ether_shost));
    470 
    471 #if NCARP > 0
    472 	if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
    473 	 	bcopy(LLADDR(ifp0->if_sadl), (caddr_t)eh->ether_shost,
    474 		    sizeof(eh->ether_shost));
    475 	}
    476 #endif /* NCARP > 0 */
    477 
    478 #ifdef PFIL_HOOKS
    479 	if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
    480 		return (error);
    481 	if (m == NULL)
    482 		return (0);
    483 #endif
    484 
    485 #if NBRIDGE > 0
    486 	/*
    487 	 * Bridges require special output handling.
    488 	 */
    489 	if (ifp->if_bridge)
    490 		return (bridge_output(ifp, m, NULL, NULL));
    491 #endif
    492 
    493 #if NCARP > 0
    494 	if (ifp != ifp0)
    495 		ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN;
    496 #endif /* NCARP > 0 */
    497 
    498 #ifdef ALTQ
    499 	/*
    500 	 * If ALTQ is enabled on the parent interface, do
    501 	 * classification; the queueing discipline might not
    502 	 * require classification, but might require the
    503 	 * address family/header pointer in the pktattr.
    504 	 */
    505 	if (ALTQ_IS_ENABLED(&ifp->if_snd))
    506 		altq_etherclassify(&ifp->if_snd, m, &pktattr);
    507 #endif
    508 
    509 	return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
    510 
    511 bad:
    512 	if (m)
    513 		m_freem(m);
    514 	return (error);
    515 }
    516 
    517 #ifdef ALTQ
    518 /*
    519  * This routine is a slight hack to allow a packet to be classified
    520  * if the Ethernet headers are present.  It will go away when ALTQ's
    521  * classification engine understands link headers.
    522  */
    523 void
    524 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
    525     struct altq_pktattr *pktattr)
    526 {
    527 	struct ether_header *eh;
    528 	u_int16_t ether_type;
    529 	int hlen, af, hdrsize;
    530 	caddr_t hdr;
    531 
    532 	hlen = ETHER_HDR_LEN;
    533 	eh = mtod(m, struct ether_header *);
    534 
    535 	ether_type = htons(eh->ether_type);
    536 
    537 	if (ether_type < ETHERMTU) {
    538 		/* LLC/SNAP */
    539 		struct llc *llc = (struct llc *)(eh + 1);
    540 		hlen += 8;
    541 
    542 		if (m->m_len < hlen ||
    543 		    llc->llc_dsap != LLC_SNAP_LSAP ||
    544 		    llc->llc_ssap != LLC_SNAP_LSAP ||
    545 		    llc->llc_control != LLC_UI) {
    546 			/* Not SNAP. */
    547 			goto bad;
    548 		}
    549 
    550 		ether_type = htons(llc->llc_un.type_snap.ether_type);
    551 	}
    552 
    553 	switch (ether_type) {
    554 	case ETHERTYPE_IP:
    555 		af = AF_INET;
    556 		hdrsize = 20;		/* sizeof(struct ip) */
    557 		break;
    558 
    559 	case ETHERTYPE_IPV6:
    560 		af = AF_INET6;
    561 		hdrsize = 40;		/* sizeof(struct ip6_hdr) */
    562 		break;
    563 
    564 	default:
    565 		af = AF_UNSPEC;
    566 		hdrsize = 0;
    567 		break;
    568 	}
    569 
    570 	while (m->m_len <= hlen) {
    571 		hlen -= m->m_len;
    572 		m = m->m_next;
    573 	}
    574 	if (m->m_len < (hlen + hdrsize)) {
    575 		/*
    576 		 * protocol header not in a single mbuf.
    577 		 * We can't cope with this situation right
    578 		 * now (but it shouldn't ever happen, really, anyhow).
    579 		 */
    580 #ifdef DEBUG
    581 		printf("altq_etherclassify: headers span multiple mbufs: "
    582 		    "%d < %d\n", m->m_len, (hlen + hdrsize));
    583 #endif
    584 		goto bad;
    585 	}
    586 
    587 	m->m_data += hlen;
    588 	m->m_len -= hlen;
    589 
    590 	hdr = mtod(m, caddr_t);
    591 
    592 	if (ALTQ_NEEDS_CLASSIFY(ifq))
    593 		pktattr->pattr_class =
    594 		    (*ifq->altq_classify)(ifq->altq_clfier, m, af);
    595 	pktattr->pattr_af = af;
    596 	pktattr->pattr_hdr = hdr;
    597 
    598 	m->m_data -= hlen;
    599 	m->m_len += hlen;
    600 
    601 	return;
    602 
    603  bad:
    604 	pktattr->pattr_class = NULL;
    605 	pktattr->pattr_hdr = NULL;
    606 	pktattr->pattr_af = AF_UNSPEC;
    607 }
    608 #endif /* ALTQ */
    609 
    610 /*
    611  * Process a received Ethernet packet;
    612  * the packet is in the mbuf chain m with
    613  * the ether header.
    614  */
    615 void
    616 ether_input(struct ifnet *ifp, struct mbuf *m)
    617 {
    618 	struct ethercom *ec = (struct ethercom *) ifp;
    619 	struct ifqueue *inq;
    620 	u_int16_t etype;
    621 	struct ether_header *eh;
    622 #if defined (ISO) || defined (LLC) || defined(NETATALK)
    623 	struct llc *l;
    624 #endif
    625 
    626 	if ((ifp->if_flags & IFF_UP) == 0) {
    627 		m_freem(m);
    628 		return;
    629 	}
    630 
    631 #ifdef MBUFTRACE
    632 	m_claimm(m, &ec->ec_rx_mowner);
    633 #endif
    634 	eh = mtod(m, struct ether_header *);
    635 	etype = ntohs(eh->ether_type);
    636 
    637 	/*
    638 	 * Determine if the packet is within its size limits.
    639 	 */
    640 	if (m->m_pkthdr.len >
    641 	    ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
    642 		if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count,
    643 			    bigpktppslim)) {
    644 			printf("%s: discarding oversize frame (len=%d)\n",
    645 			    ifp->if_xname, m->m_pkthdr.len);
    646 		}
    647 		m_freem(m);
    648 		return;
    649 	}
    650 
    651 	if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
    652 		/*
    653 		 * If this is not a simplex interface, drop the packet
    654 		 * if it came from us.
    655 		 */
    656 		if ((ifp->if_flags & IFF_SIMPLEX) == 0 &&
    657 		    memcmp(LLADDR(ifp->if_sadl), eh->ether_shost,
    658 		    ETHER_ADDR_LEN) == 0) {
    659 			m_freem(m);
    660 			return;
    661 		}
    662 
    663 		if (memcmp(etherbroadcastaddr,
    664 		    eh->ether_dhost, ETHER_ADDR_LEN) == 0)
    665 			m->m_flags |= M_BCAST;
    666 		else
    667 			m->m_flags |= M_MCAST;
    668 		ifp->if_imcasts++;
    669 	}
    670 
    671 	/* If the CRC is still on the packet, trim it off. */
    672 	if (m->m_flags & M_HASFCS) {
    673 		m_adj(m, -ETHER_CRC_LEN);
    674 		m->m_flags &= ~M_HASFCS;
    675 	}
    676 
    677 	ifp->if_ibytes += m->m_pkthdr.len;
    678 
    679 #if NBRIDGE > 0
    680 	/*
    681 	 * Tap the packet off here for a bridge.  bridge_input()
    682 	 * will return NULL if it has consumed the packet, otherwise
    683 	 * it gets processed as normal.  Note that bridge_input()
    684 	 * will always return the original packet if we need to
    685 	 * process it locally.
    686 	 */
    687 	if (ifp->if_bridge) {
    688 		/* clear M_PROMISC, in case the packets comes from a vlan */
    689 		m->m_flags &= ~M_PROMISC;
    690 		m = bridge_input(ifp, m);
    691 		if (m == NULL)
    692 			return;
    693 
    694 		/*
    695 		 * Bridge has determined that the packet is for us.
    696 		 * Update our interface pointer -- we may have had
    697 		 * to "bridge" the packet locally.
    698 		 */
    699 		ifp = m->m_pkthdr.rcvif;
    700 	} else
    701 #endif /* NBRIDGE > 0 */
    702 	{
    703 
    704 #if NCARP > 0
    705 		if (ifp->if_carp && ifp->if_type != IFT_CARP &&
    706 		    (carp_input(m, (u_int8_t *)&eh->ether_shost,
    707 		    (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0)) {
    708 			return;
    709 		}
    710 #endif /* NCARP > 0 */
    711 		if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
    712 		    (ifp->if_flags & IFF_PROMISC) != 0 &&
    713 		    memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost,
    714 			   ETHER_ADDR_LEN) != 0) {
    715 			m->m_flags |= M_PROMISC;
    716 		}
    717 	}
    718 
    719 #ifdef PFIL_HOOKS
    720 	if ((m->m_flags & M_PROMISC) == 0) {
    721 		if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
    722 			return;
    723 		if (m == NULL)
    724 			return;
    725 
    726 		eh = mtod(m, struct ether_header *);
    727 		etype = ntohs(eh->ether_type);
    728 	}
    729 #endif
    730 
    731 	/*
    732 	 * If VLANs are configured on the interface, check to
    733 	 * see if the device performed the decapsulation and
    734 	 * provided us with the tag.
    735 	 */
    736 	if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
    737 #if NVLAN > 0
    738 		/*
    739 		 * vlan_input() will either recursively call ether_input()
    740 		 * or drop the packet.
    741 		 */
    742 		vlan_input(ifp, m);
    743 #else
    744 		m_freem(m);
    745 #endif
    746 		return;
    747 	}
    748 
    749 #if NAGR > 0
    750 	if (ifp->if_agrprivate &&
    751 	    __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
    752 		m->m_flags &= ~M_PROMISC;
    753 		agr_input(ifp, m);
    754 		return;
    755 	}
    756 #endif /* NAGR > 0 */
    757 
    758 	/*
    759 	 * Handle protocols that expect to have the Ethernet header
    760 	 * (and possibly FCS) intact.
    761 	 */
    762 	switch (etype) {
    763 #if NVLAN > 0
    764 	case ETHERTYPE_VLAN:
    765 		/*
    766 		 * vlan_input() will either recursively call ether_input()
    767 		 * or drop the packet.
    768 		 */
    769 		if (((struct ethercom *)ifp)->ec_nvlans != 0)
    770 			vlan_input(ifp, m);
    771 		else
    772 			m_freem(m);
    773 		return;
    774 #endif /* NVLAN > 0 */
    775 #if NPPPOE > 0
    776 	case ETHERTYPE_PPPOEDISC:
    777 	case ETHERTYPE_PPPOE:
    778 		if (m->m_flags & M_PROMISC) {
    779 			m_freem(m);
    780 			return;
    781 		}
    782 #ifndef PPPOE_SERVER
    783 		if (m->m_flags & (M_MCAST | M_BCAST)) {
    784 			m_freem(m);
    785 			return;
    786 		}
    787 #endif
    788 
    789 		if (etype == ETHERTYPE_PPPOEDISC)
    790 			inq = &ppoediscinq;
    791 		else
    792 			inq = &ppoeinq;
    793 		if (IF_QFULL(inq)) {
    794 			IF_DROP(inq);
    795 			m_freem(m);
    796 		} else
    797 			IF_ENQUEUE(inq, m);
    798 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
    799 		if (!callout_pending(&pppoe_softintr))
    800 			callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL);
    801 #else
    802 		softintr_schedule(pppoe_softintr);
    803 #endif
    804 		return;
    805 #endif /* NPPPOE > 0 */
    806 	case ETHERTYPE_SLOWPROTOCOLS: {
    807 		uint8_t subtype;
    808 
    809 #if defined(DIAGNOSTIC)
    810 		if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
    811 			panic("ether_input: too short slow protocol packet");
    812 		}
    813 #endif
    814 		m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
    815 		switch (subtype) {
    816 #if NAGR > 0
    817 		case SLOWPROTOCOLS_SUBTYPE_LACP:
    818 			if (ifp->if_agrprivate) {
    819 				ieee8023ad_lacp_input(ifp, m);
    820 				return;
    821 			}
    822 			break;
    823 
    824 		case SLOWPROTOCOLS_SUBTYPE_MARKER:
    825 			if (ifp->if_agrprivate) {
    826 				ieee8023ad_marker_input(ifp, m);
    827 				return;
    828 			}
    829 			break;
    830 #endif /* NAGR > 0 */
    831 		default:
    832 			if (subtype == 0 || subtype > 10) {
    833 				/* illegal value */
    834 				m_freem(m);
    835 				return;
    836 			}
    837 			/* unknown subtype */
    838 			break;
    839 		}
    840 		/* FALLTHROUGH */
    841 	}
    842 	default:
    843 		if (m->m_flags & M_PROMISC) {
    844 			m_freem(m);
    845 			return;
    846 		}
    847 	}
    848 
    849 	/* If the CRC is still on the packet, trim it off. */
    850 	if (m->m_flags & M_HASFCS) {
    851 		m_adj(m, -ETHER_CRC_LEN);
    852 		m->m_flags &= ~M_HASFCS;
    853 	}
    854 
    855 	if (etype > ETHERMTU + sizeof (struct ether_header)) {
    856 		/* Strip off the Ethernet header. */
    857 		m_adj(m, sizeof(struct ether_header));
    858 
    859 		switch (etype) {
    860 #ifdef INET
    861 		case ETHERTYPE_IP:
    862 #ifdef GATEWAY
    863 			if (ipflow_fastforward(m))
    864 				return;
    865 #endif
    866 			schednetisr(NETISR_IP);
    867 			inq = &ipintrq;
    868 			break;
    869 
    870 		case ETHERTYPE_ARP:
    871 			schednetisr(NETISR_ARP);
    872 			inq = &arpintrq;
    873 			break;
    874 
    875 		case ETHERTYPE_REVARP:
    876 			revarpinput(m);	/* XXX queue? */
    877 			return;
    878 #endif
    879 #ifdef INET6
    880 		case ETHERTYPE_IPV6:
    881 			schednetisr(NETISR_IPV6);
    882 			inq = &ip6intrq;
    883 			break;
    884 #endif
    885 #ifdef IPX
    886 		case ETHERTYPE_IPX:
    887 			schednetisr(NETISR_IPX);
    888 			inq = &ipxintrq;
    889 			break;
    890 #endif
    891 #ifdef NETATALK
    892         	case ETHERTYPE_ATALK:
    893                 	schednetisr(NETISR_ATALK);
    894                 	inq = &atintrq1;
    895                 	break;
    896         	case ETHERTYPE_AARP:
    897 			/* probably this should be done with a NETISR as well */
    898                 	aarpinput(ifp, m); /* XXX */
    899                 	return;
    900 #endif /* NETATALK */
    901 		default:
    902 			m_freem(m);
    903 			return;
    904 		}
    905 	} else {
    906 #if defined (ISO) || defined (LLC) || defined (NETATALK)
    907 		l = (struct llc *)(eh+1);
    908 		switch (l->llc_dsap) {
    909 #ifdef NETATALK
    910 		case LLC_SNAP_LSAP:
    911 			switch (l->llc_control) {
    912 			case LLC_UI:
    913 				if (l->llc_ssap != LLC_SNAP_LSAP) {
    914 					goto dropanyway;
    915 				}
    916 
    917 				if (Bcmp(&(l->llc_snap_org_code)[0],
    918 				    at_org_code, sizeof(at_org_code)) == 0 &&
    919 				    ntohs(l->llc_snap_ether_type) ==
    920 				    ETHERTYPE_ATALK) {
    921 					inq = &atintrq2;
    922 					m_adj(m, sizeof(struct ether_header)
    923 					    + sizeof(struct llc));
    924 					schednetisr(NETISR_ATALK);
    925 					break;
    926 				}
    927 
    928 				if (Bcmp(&(l->llc_snap_org_code)[0],
    929 				    aarp_org_code,
    930 				    sizeof(aarp_org_code)) == 0 &&
    931 				    ntohs(l->llc_snap_ether_type) ==
    932 				    ETHERTYPE_AARP) {
    933 					m_adj( m, sizeof(struct ether_header)
    934 					    + sizeof(struct llc));
    935 					aarpinput(ifp, m); /* XXX */
    936 				    return;
    937 				}
    938 
    939 			default:
    940 				goto dropanyway;
    941 			}
    942 			break;
    943 #endif /* NETATALK */
    944 #ifdef	ISO
    945 		case LLC_ISO_LSAP:
    946 			switch (l->llc_control) {
    947 			case LLC_UI:
    948 				/* LLC_UI_P forbidden in class 1 service */
    949 				if ((l->llc_dsap == LLC_ISO_LSAP) &&	/* XXX? case tested */
    950 				    (l->llc_ssap == LLC_ISO_LSAP)) {
    951 					/* LSAP for ISO */
    952 					/* XXX length computation?? */
    953 					if (m->m_pkthdr.len > etype + sizeof(struct ether_header))
    954 						m_adj(m, etype - m->m_pkthdr.len);
    955 
    956 #ifdef ARGO_DEBUG
    957 					if (argo_debug[D_ETHER])
    958 						printf("clnp packet");
    959 #endif
    960 					schednetisr(NETISR_ISO);
    961 					inq = &clnlintrq;
    962 					break;
    963 				}
    964 				goto dropanyway;
    965 
    966 			case LLC_XID:
    967 			case LLC_XID_P:
    968 				if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header))
    969 					/* XXX m_pullup? */
    970 					goto dropanyway;
    971 				l->llc_window = 0;
    972 				l->llc_fid = LLC_XID_FORMAT_BASIC;
    973 				l->llc_class = LLC_XID_CLASS_I;
    974 				l->llc_dsap = l->llc_ssap = 0;
    975 				/* Fall through to */
    976 			case LLC_TEST:
    977 			case LLC_TEST_P:
    978 			{
    979 				struct sockaddr sa;
    980 				struct ether_header *eh2;
    981 				int i;
    982 				u_char c = l->llc_dsap;
    983 
    984 				l->llc_dsap = l->llc_ssap;
    985 				l->llc_ssap = c;
    986 				m_adj(m, sizeof(struct ether_header));
    987 				/* XXX we can optimize here? */
    988 				if (m->m_flags & (M_BCAST | M_MCAST))
    989 					bcopy(LLADDR(ifp->if_sadl),
    990 					      (caddr_t)eh->ether_dhost, 6);
    991 				sa.sa_family = AF_UNSPEC;
    992 				sa.sa_len = sizeof(sa);
    993 				eh2 = (struct ether_header *)sa.sa_data;
    994 				for (i = 0; i < 6; i++) {
    995 					eh2->ether_shost[i] = c =
    996 					    eh->ether_dhost[i];
    997 					eh2->ether_dhost[i] =
    998 					    eh->ether_dhost[i] =
    999 					    eh->ether_shost[i];
   1000 					eh->ether_shost[i] = c;
   1001 				}
   1002 				ifp->if_output(ifp, m, &sa, NULL);
   1003 				return;
   1004 			}
   1005 			default:
   1006 				m_freem(m);
   1007 				return;
   1008 			}
   1009 			break;
   1010 #endif /* ISO */
   1011 #if defined (ISO) || defined (NETATALK)
   1012 		dropanyway:
   1013 #endif
   1014 		default:
   1015 			m_freem(m);
   1016 			return;
   1017 		}
   1018 #else /* ISO || LLC || NETATALK*/
   1019 		m_freem(m);
   1020 		return;
   1021 #endif /* ISO || LLC || NETATALK*/
   1022 	}
   1023 
   1024 	if (IF_QFULL(inq)) {
   1025 		IF_DROP(inq);
   1026 		m_freem(m);
   1027 	} else
   1028 		IF_ENQUEUE(inq, m);
   1029 }
   1030 
   1031 /*
   1032  * Convert Ethernet address to printable (loggable) representation.
   1033  */
   1034 char *
   1035 ether_sprintf(const u_char *ap)
   1036 {
   1037 	static char etherbuf[3 * ETHER_ADDR_LEN];
   1038 	return ether_snprintf(etherbuf, sizeof(etherbuf), ap);
   1039 	return etherbuf;
   1040 }
   1041 
   1042 char *
   1043 ether_snprintf(char *buf, size_t len, const u_char *ap)
   1044 {
   1045 	char *cp = buf;
   1046 	size_t i;
   1047 
   1048 	for (i = 0; i < len / 3; i++) {
   1049 		*cp++ = hexdigits[*ap >> 4];
   1050 		*cp++ = hexdigits[*ap++ & 0xf];
   1051 		*cp++ = ':';
   1052 	}
   1053 	*--cp = '\0';
   1054 	return buf;
   1055 }
   1056 
   1057 /*
   1058  * Perform common duties while attaching to interface list
   1059  */
   1060 void
   1061 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
   1062 {
   1063 	struct ethercom *ec = (struct ethercom *)ifp;
   1064 
   1065 	ifp->if_type = IFT_ETHER;
   1066 	ifp->if_addrlen = ETHER_ADDR_LEN;
   1067 	ifp->if_hdrlen = ETHER_HDR_LEN;
   1068 	ifp->if_dlt = DLT_EN10MB;
   1069 	ifp->if_mtu = ETHERMTU;
   1070 	ifp->if_output = ether_output;
   1071 	ifp->if_input = ether_input;
   1072 	if (ifp->if_baudrate == 0)
   1073 		ifp->if_baudrate = IF_Mbps(10);		/* just a default */
   1074 
   1075 	if_alloc_sadl(ifp);
   1076 	memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
   1077 
   1078 	LIST_INIT(&ec->ec_multiaddrs);
   1079 	ifp->if_broadcastaddr = etherbroadcastaddr;
   1080 #if NBPFILTER > 0
   1081 	bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
   1082 #endif
   1083 #ifdef MBUFTRACE
   1084 	strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname,
   1085 	    sizeof(ec->ec_tx_mowner.mo_name));
   1086 	strlcpy(ec->ec_tx_mowner.mo_descr, "tx",
   1087 	    sizeof(ec->ec_tx_mowner.mo_descr));
   1088 	strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname,
   1089 	    sizeof(ec->ec_rx_mowner.mo_name));
   1090 	strlcpy(ec->ec_rx_mowner.mo_descr, "rx",
   1091 	    sizeof(ec->ec_rx_mowner.mo_descr));
   1092 	MOWNER_ATTACH(&ec->ec_tx_mowner);
   1093 	MOWNER_ATTACH(&ec->ec_rx_mowner);
   1094 	ifp->if_mowner = &ec->ec_tx_mowner;
   1095 #endif
   1096 }
   1097 
   1098 void
   1099 ether_ifdetach(struct ifnet *ifp)
   1100 {
   1101 	struct ethercom *ec = (void *) ifp;
   1102 	struct ether_multi *enm;
   1103 	int s;
   1104 
   1105 #if NBRIDGE > 0
   1106 	if (ifp->if_bridge)
   1107 		bridge_ifdetach(ifp);
   1108 #endif
   1109 
   1110 #if NBPFILTER > 0
   1111 	bpfdetach(ifp);
   1112 #endif
   1113 
   1114 #if NVLAN > 0
   1115 	if (ec->ec_nvlans)
   1116 		vlan_ifdetach(ifp);
   1117 #endif
   1118 
   1119 	s = splnet();
   1120 	while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
   1121 		LIST_REMOVE(enm, enm_list);
   1122 		free(enm, M_IFMADDR);
   1123 		ec->ec_multicnt--;
   1124 	}
   1125 	splx(s);
   1126 
   1127 #if 0	/* done in if_detach() */
   1128 	if_free_sadl(ifp);
   1129 #endif
   1130 
   1131 	MOWNER_DETACH(&ec->ec_rx_mowner);
   1132 	MOWNER_DETACH(&ec->ec_tx_mowner);
   1133 }
   1134 
   1135 #if 0
   1136 /*
   1137  * This is for reference.  We have a table-driven version
   1138  * of the little-endian crc32 generator, which is faster
   1139  * than the double-loop.
   1140  */
   1141 u_int32_t
   1142 ether_crc32_le(const u_int8_t *buf, size_t len)
   1143 {
   1144 	u_int32_t c, crc, carry;
   1145 	size_t i, j;
   1146 
   1147 	crc = 0xffffffffU;	/* initial value */
   1148 
   1149 	for (i = 0; i < len; i++) {
   1150 		c = buf[i];
   1151 		for (j = 0; j < 8; j++) {
   1152 			carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
   1153 			crc >>= 1;
   1154 			c >>= 1;
   1155 			if (carry)
   1156 				crc = (crc ^ ETHER_CRC_POLY_LE);
   1157 		}
   1158 	}
   1159 
   1160 	return (crc);
   1161 }
   1162 #else
   1163 u_int32_t
   1164 ether_crc32_le(const u_int8_t *buf, size_t len)
   1165 {
   1166 	static const u_int32_t crctab[] = {
   1167 		0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
   1168 		0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
   1169 		0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
   1170 		0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
   1171 	};
   1172 	u_int32_t crc;
   1173 	size_t i;
   1174 
   1175 	crc = 0xffffffffU;	/* initial value */
   1176 
   1177 	for (i = 0; i < len; i++) {
   1178 		crc ^= buf[i];
   1179 		crc = (crc >> 4) ^ crctab[crc & 0xf];
   1180 		crc = (crc >> 4) ^ crctab[crc & 0xf];
   1181 	}
   1182 
   1183 	return (crc);
   1184 }
   1185 #endif
   1186 
   1187 u_int32_t
   1188 ether_crc32_be(const u_int8_t *buf, size_t len)
   1189 {
   1190 	u_int32_t c, crc, carry;
   1191 	size_t i, j;
   1192 
   1193 	crc = 0xffffffffU;	/* initial value */
   1194 
   1195 	for (i = 0; i < len; i++) {
   1196 		c = buf[i];
   1197 		for (j = 0; j < 8; j++) {
   1198 			carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
   1199 			crc <<= 1;
   1200 			c >>= 1;
   1201 			if (carry)
   1202 				crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
   1203 		}
   1204 	}
   1205 
   1206 	return (crc);
   1207 }
   1208 
   1209 #ifdef INET
   1210 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] =
   1211     { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
   1212 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] =
   1213     { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
   1214 #endif
   1215 #ifdef INET6
   1216 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] =
   1217     { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
   1218 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] =
   1219     { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
   1220 #endif
   1221 
   1222 /*
   1223  * ether_aton implementation, not using a static buffer.
   1224  */
   1225 int
   1226 ether_nonstatic_aton(u_char *dest, char *str)
   1227 {
   1228         int i;
   1229         char *cp = str;
   1230         u_char val[6];
   1231 
   1232 #define set_value                       \
   1233         if (*cp > '9' && *cp < 'a')     \
   1234                 *cp -= 'A' - 10;        \
   1235         else if (*cp > '9')             \
   1236                 *cp -= 'a' - 10;        \
   1237         else                            \
   1238                 *cp -= '0'
   1239 
   1240         for (i = 0; i < 6; i++, cp++) {
   1241                 if (!isxdigit(*cp))
   1242                         return (1);
   1243                 set_value;
   1244                 val[i] = *cp++;
   1245                 if (isxdigit(*cp)) {
   1246                         set_value;
   1247                         val[i] *= 16;
   1248                         val[i] += *cp++;
   1249                 }
   1250                 if (*cp == ':' || i == 5)
   1251                         continue;
   1252                 else
   1253                         return 1;
   1254         }
   1255         memcpy(dest, val, 6);
   1256 
   1257         return 0;
   1258 }
   1259 
   1260 
   1261 /*
   1262  * Convert a sockaddr into an Ethernet address or range of Ethernet
   1263  * addresses.
   1264  */
   1265 int
   1266 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN],
   1267     u_int8_t addrhi[ETHER_ADDR_LEN])
   1268 {
   1269 #ifdef INET
   1270 	struct sockaddr_in *sin;
   1271 #endif /* INET */
   1272 #ifdef INET6
   1273 	struct sockaddr_in6 *sin6;
   1274 #endif /* INET6 */
   1275 
   1276 	switch (sa->sa_family) {
   1277 
   1278 	case AF_UNSPEC:
   1279 		bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN);
   1280 		bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
   1281 		break;
   1282 
   1283 #ifdef INET
   1284 	case AF_INET:
   1285 		sin = satosin(sa);
   1286 		if (sin->sin_addr.s_addr == INADDR_ANY) {
   1287 			/*
   1288 			 * An IP address of INADDR_ANY means listen to
   1289 			 * or stop listening to all of the Ethernet
   1290 			 * multicast addresses used for IP.
   1291 			 * (This is for the sake of IP multicast routers.)
   1292 			 */
   1293 			bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN);
   1294 			bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN);
   1295 		}
   1296 		else {
   1297 			ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
   1298 			bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
   1299 		}
   1300 		break;
   1301 #endif
   1302 #ifdef INET6
   1303 	case AF_INET6:
   1304 		sin6 = satosin6(sa);
   1305 		if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
   1306 			/*
   1307 			 * An IP6 address of 0 means listen to or stop
   1308 			 * listening to all of the Ethernet multicast
   1309 			 * address used for IP6.
   1310 			 * (This is used for multicast routers.)
   1311 			 */
   1312 			bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN);
   1313 			bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN);
   1314 		} else {
   1315 			ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
   1316 			bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
   1317 		}
   1318 		break;
   1319 #endif
   1320 
   1321 	default:
   1322 		return (EAFNOSUPPORT);
   1323 	}
   1324 	return (0);
   1325 }
   1326 
   1327 /*
   1328  * Add an Ethernet multicast address or range of addresses to the list for a
   1329  * given interface.
   1330  */
   1331 int
   1332 ether_addmulti(struct ifreq *ifr, struct ethercom *ec)
   1333 {
   1334 	struct ether_multi *enm;
   1335 	u_char addrlo[ETHER_ADDR_LEN];
   1336 	u_char addrhi[ETHER_ADDR_LEN];
   1337 	int s = splnet(), error;
   1338 
   1339 	error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
   1340 	if (error != 0) {
   1341 		splx(s);
   1342 		return (error);
   1343 	}
   1344 
   1345 	/*
   1346 	 * Verify that we have valid Ethernet multicast addresses.
   1347 	 */
   1348 	if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
   1349 		splx(s);
   1350 		return (EINVAL);
   1351 	}
   1352 	/*
   1353 	 * See if the address range is already in the list.
   1354 	 */
   1355 	ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
   1356 	if (enm != NULL) {
   1357 		/*
   1358 		 * Found it; just increment the reference count.
   1359 		 */
   1360 		++enm->enm_refcount;
   1361 		splx(s);
   1362 		return (0);
   1363 	}
   1364 	/*
   1365 	 * New address or range; malloc a new multicast record
   1366 	 * and link it into the interface's multicast list.
   1367 	 */
   1368 	enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
   1369 	if (enm == NULL) {
   1370 		splx(s);
   1371 		return (ENOBUFS);
   1372 	}
   1373 	bcopy(addrlo, enm->enm_addrlo, 6);
   1374 	bcopy(addrhi, enm->enm_addrhi, 6);
   1375 	enm->enm_refcount = 1;
   1376 	LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
   1377 	ec->ec_multicnt++;
   1378 	splx(s);
   1379 	/*
   1380 	 * Return ENETRESET to inform the driver that the list has changed
   1381 	 * and its reception filter should be adjusted accordingly.
   1382 	 */
   1383 	return (ENETRESET);
   1384 }
   1385 
   1386 /*
   1387  * Delete a multicast address record.
   1388  */
   1389 int
   1390 ether_delmulti(struct ifreq *ifr, struct ethercom *ec)
   1391 {
   1392 	struct ether_multi *enm;
   1393 	u_char addrlo[ETHER_ADDR_LEN];
   1394 	u_char addrhi[ETHER_ADDR_LEN];
   1395 	int s = splnet(), error;
   1396 
   1397 	error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
   1398 	if (error != 0) {
   1399 		splx(s);
   1400 		return (error);
   1401 	}
   1402 
   1403 	/*
   1404 	 * Look ur the address in our list.
   1405 	 */
   1406 	ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
   1407 	if (enm == NULL) {
   1408 		splx(s);
   1409 		return (ENXIO);
   1410 	}
   1411 	if (--enm->enm_refcount != 0) {
   1412 		/*
   1413 		 * Still some claims to this record.
   1414 		 */
   1415 		splx(s);
   1416 		return (0);
   1417 	}
   1418 	/*
   1419 	 * No remaining claims to this record; unlink and free it.
   1420 	 */
   1421 	LIST_REMOVE(enm, enm_list);
   1422 	free(enm, M_IFMADDR);
   1423 	ec->ec_multicnt--;
   1424 	splx(s);
   1425 	/*
   1426 	 * Return ENETRESET to inform the driver that the list has changed
   1427 	 * and its reception filter should be adjusted accordingly.
   1428 	 */
   1429 	return (ENETRESET);
   1430 }
   1431 
   1432 /*
   1433  * Common ioctls for Ethernet interfaces.  Note, we must be
   1434  * called at splnet().
   1435  */
   1436 int
   1437 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
   1438 {
   1439 	struct ethercom *ec = (void *) ifp;
   1440 	struct ifreq *ifr = (struct ifreq *)data;
   1441 	struct ifaddr *ifa = (struct ifaddr *)data;
   1442 	int error = 0;
   1443 
   1444 	switch (cmd) {
   1445 	case SIOCSIFADDR:
   1446 		ifp->if_flags |= IFF_UP;
   1447 		switch (ifa->ifa_addr->sa_family) {
   1448 		case AF_LINK:
   1449 		    {
   1450 			struct sockaddr_dl *sdl =
   1451 			    (struct sockaddr_dl *) ifa->ifa_addr;
   1452 
   1453 			if (sdl->sdl_type != IFT_ETHER ||
   1454 			    sdl->sdl_alen != ifp->if_addrlen) {
   1455 				error = EINVAL;
   1456 				break;
   1457 			}
   1458 
   1459 			memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl),
   1460 			    ifp->if_addrlen);
   1461 
   1462 			/* Set new address. */
   1463 			error = (*ifp->if_init)(ifp);
   1464 			break;
   1465 		    }
   1466 #ifdef INET
   1467 		case AF_INET:
   1468 			if ((ifp->if_flags & IFF_RUNNING) == 0 &&
   1469 			    (error = (*ifp->if_init)(ifp)) != 0)
   1470 				break;
   1471 			arp_ifinit(ifp, ifa);
   1472 			break;
   1473 #endif /* INET */
   1474 		default:
   1475 			if ((ifp->if_flags & IFF_RUNNING) == 0)
   1476 				error = (*ifp->if_init)(ifp);
   1477 			break;
   1478 		}
   1479 		break;
   1480 
   1481 	case SIOCGIFADDR:
   1482 		memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data,
   1483 		    LLADDR(ifp->if_sadl), ETHER_ADDR_LEN);
   1484 		break;
   1485 
   1486 	case SIOCSIFMTU:
   1487 	    {
   1488 		int maxmtu;
   1489 
   1490 		if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
   1491 			maxmtu = ETHERMTU_JUMBO;
   1492 		else
   1493 			maxmtu = ETHERMTU;
   1494 
   1495 		if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
   1496 			error = EINVAL;
   1497 		else {
   1498 			ifp->if_mtu = ifr->ifr_mtu;
   1499 
   1500 			/* Make sure the device notices the MTU change. */
   1501 			if (ifp->if_flags & IFF_UP)
   1502 				error = (*ifp->if_init)(ifp);
   1503 		}
   1504 		break;
   1505 	    }
   1506 
   1507 	case SIOCSIFFLAGS:
   1508 		if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
   1509 			/*
   1510 			 * If interface is marked down and it is running,
   1511 			 * then stop and disable it.
   1512 			 */
   1513 			(*ifp->if_stop)(ifp, 1);
   1514 		} else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
   1515 			/*
   1516 			 * If interface is marked up and it is stopped, then
   1517 			 * start it.
   1518 			 */
   1519 			error = (*ifp->if_init)(ifp);
   1520 		} else if ((ifp->if_flags & IFF_UP) != 0) {
   1521 			/*
   1522 			 * Reset the interface to pick up changes in any other
   1523 			 * flags that affect the hardware state.
   1524 			 */
   1525 			error = (*ifp->if_init)(ifp);
   1526 		}
   1527 		break;
   1528 
   1529 	case SIOCADDMULTI:
   1530 		error = ether_addmulti(ifr, ec);
   1531 		break;
   1532 
   1533 	case SIOCDELMULTI:
   1534 		error = ether_delmulti(ifr, ec);
   1535 		break;
   1536 
   1537 	default:
   1538 		error = ENOTTY;
   1539 	}
   1540 
   1541 	return (error);
   1542 }
   1543