148#define V_ether_ipfw VNET(ether_ipfw)
149#endif
150
151
152/*
153 * Ethernet output routine.
154 * Encapsulate a packet of type family for the local net.
155 * Use trailer local net encapsulation if enough data in first
156 * packet leaves a multiple of 512 bytes of data in remainder.
157 */
158int
159ether_output(struct ifnet *ifp, struct mbuf *m,
160 struct sockaddr *dst, struct route *ro)
161{
162 short type;
163 int error = 0, hdrcmplt = 0;
164 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
165 struct llentry *lle = NULL;
166 struct rtentry *rt0 = NULL;
167 struct ether_header *eh;
168 struct pf_mtag *t;
169 int loop_copy = 1;
170 int hlen; /* link layer header length */
171
172 if (ro != NULL) {
173 if (!(m->m_flags & (M_BCAST | M_MCAST)))
174 lle = ro->ro_lle;
175 rt0 = ro->ro_rt;
176 }
177#ifdef MAC
178 error = mac_ifnet_check_transmit(ifp, m);
179 if (error)
180 senderr(error);
181#endif
182
183 M_PROFILE(m);
184 if (ifp->if_flags & IFF_MONITOR)
185 senderr(ENETDOWN);
186 if (!((ifp->if_flags & IFF_UP) &&
187 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
188 senderr(ENETDOWN);
189
190 hlen = ETHER_HDR_LEN;
191 switch (dst->sa_family) {
192#ifdef INET
193 case AF_INET:
194 if (lle != NULL && (lle->la_flags & LLE_VALID))
195 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
196 else
197 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
198 if (error)
199 return (error == EWOULDBLOCK ? 0 : error);
200 type = htons(ETHERTYPE_IP);
201 break;
202 case AF_ARP:
203 {
204 struct arphdr *ah;
205 ah = mtod(m, struct arphdr *);
206 ah->ar_hrd = htons(ARPHRD_ETHER);
207
208 loop_copy = 0; /* if this is for us, don't do it */
209
210 switch(ntohs(ah->ar_op)) {
211 case ARPOP_REVREQUEST:
212 case ARPOP_REVREPLY:
213 type = htons(ETHERTYPE_REVARP);
214 break;
215 case ARPOP_REQUEST:
216 case ARPOP_REPLY:
217 default:
218 type = htons(ETHERTYPE_ARP);
219 break;
220 }
221
222 if (m->m_flags & M_BCAST)
223 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
224 else
225 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
226
227 }
228 break;
229#endif
230#ifdef INET6
231 case AF_INET6:
232 if (lle != NULL && (lle->la_flags & LLE_VALID))
233 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
234 else
235 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
236 if (error)
237 return error;
238 type = htons(ETHERTYPE_IPV6);
239 break;
240#endif
241#ifdef IPX
242 case AF_IPX:
243 if (ef_outputp) {
244 error = ef_outputp(ifp, &m, dst, &type, &hlen);
245 if (error)
246 goto bad;
247 } else
248 type = htons(ETHERTYPE_IPX);
249 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
250 (caddr_t)edst, sizeof (edst));
251 break;
252#endif
253#ifdef NETATALK
254 case AF_APPLETALK:
255 {
256 struct at_ifaddr *aa;
257
258 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
259 senderr(EHOSTUNREACH); /* XXX */
260 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) {
261 ifa_free(&aa->aa_ifa);
262 return (0);
263 }
264 /*
265 * In the phase 2 case, need to prepend an mbuf for the llc header.
266 */
267 if ( aa->aa_flags & AFA_PHASE2 ) {
268 struct llc llc;
269
270 ifa_free(&aa->aa_ifa);
271 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
272 if (m == NULL)
273 senderr(ENOBUFS);
274 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
275 llc.llc_control = LLC_UI;
276 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
277 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
278 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
279 type = htons(m->m_pkthdr.len);
280 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
281 } else {
282 ifa_free(&aa->aa_ifa);
283 type = htons(ETHERTYPE_AT);
284 }
285 break;
286 }
287#endif /* NETATALK */
288
289 case pseudo_AF_HDRCMPLT:
290 hdrcmplt = 1;
291 eh = (struct ether_header *)dst->sa_data;
292 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
293 /* FALLTHROUGH */
294
295 case AF_UNSPEC:
296 loop_copy = 0; /* if this is for us, don't do it */
297 eh = (struct ether_header *)dst->sa_data;
298 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
299 type = eh->ether_type;
300 break;
301
302 default:
303 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
304 senderr(EAFNOSUPPORT);
305 }
306
307 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
308 int csum_flags = 0;
309 if (m->m_pkthdr.csum_flags & CSUM_IP)
310 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
311 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
312 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
313 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
314 csum_flags |= CSUM_SCTP_VALID;
315 m->m_pkthdr.csum_flags |= csum_flags;
316 m->m_pkthdr.csum_data = 0xffff;
317 return (if_simloop(ifp, m, dst->sa_family, 0));
318 }
319
320 /*
321 * Add local net header. If no space in first mbuf,
322 * allocate another.
323 */
324 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
325 if (m == NULL)
326 senderr(ENOBUFS);
327 eh = mtod(m, struct ether_header *);
328 (void)memcpy(&eh->ether_type, &type,
329 sizeof(eh->ether_type));
330 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
331 if (hdrcmplt)
332 (void)memcpy(eh->ether_shost, esrc,
333 sizeof(eh->ether_shost));
334 else
335 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
336 sizeof(eh->ether_shost));
337
338 /*
339 * If a simplex interface, and the packet is being sent to our
340 * Ethernet address or a broadcast address, loopback a copy.
341 * XXX To make a simplex device behave exactly like a duplex
342 * device, we should copy in the case of sending to our own
343 * ethernet address (thus letting the original actually appear
344 * on the wire). However, we don't do that here for security
345 * reasons and compatibility with the original behavior.
346 */
347 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
348 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
349 int csum_flags = 0;
350
351 if (m->m_pkthdr.csum_flags & CSUM_IP)
352 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
353 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
354 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
355 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
356 csum_flags |= CSUM_SCTP_VALID;
357
358 if (m->m_flags & M_BCAST) {
359 struct mbuf *n;
360
361 /*
362 * Because if_simloop() modifies the packet, we need a
363 * writable copy through m_dup() instead of a readonly
364 * one as m_copy[m] would give us. The alternative would
365 * be to modify if_simloop() to handle the readonly mbuf,
366 * but performancewise it is mostly equivalent (trading
367 * extra data copying vs. extra locking).
368 *
369 * XXX This is a local workaround. A number of less
370 * often used kernel parts suffer from the same bug.
371 * See PR kern/105943 for a proposed general solution.
372 */
373 if ((n = m_dup(m, M_DONTWAIT)) != NULL) {
374 n->m_pkthdr.csum_flags |= csum_flags;
375 if (csum_flags & CSUM_DATA_VALID)
376 n->m_pkthdr.csum_data = 0xffff;
377 (void)if_simloop(ifp, n, dst->sa_family, hlen);
378 } else
379 ifp->if_iqdrops++;
380 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
381 ETHER_ADDR_LEN) == 0) {
382 m->m_pkthdr.csum_flags |= csum_flags;
383 if (csum_flags & CSUM_DATA_VALID)
384 m->m_pkthdr.csum_data = 0xffff;
385 (void) if_simloop(ifp, m, dst->sa_family, hlen);
386 return (0); /* XXX */
387 }
388 }
389
390 /*
391 * Bridges require special output handling.
392 */
393 if (ifp->if_bridge) {
394 BRIDGE_OUTPUT(ifp, m, error);
395 return (error);
396 }
397
398#if defined(INET) || defined(INET6)
399 if (ifp->if_carp &&
400 (error = (*carp_output_p)(ifp, m, dst, NULL)))
401 goto bad;
402#endif
403
404 /* Handle ng_ether(4) processing, if any */
405 if (IFP2AC(ifp)->ac_netgraph != NULL) {
406 KASSERT(ng_ether_output_p != NULL,
407 ("ng_ether_output_p is NULL"));
408 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
409bad: if (m != NULL)
410 m_freem(m);
411 return (error);
412 }
413 if (m == NULL)
414 return (0);
415 }
416
417 /* Continue with link-layer output */
418 return ether_output_frame(ifp, m);
419}
420
421/*
422 * Ethernet link layer output routine to send a raw frame to the device.
423 *
424 * This assumes that the 14 byte Ethernet header is present and contiguous
425 * in the first mbuf (if BRIDGE'ing).
426 */
427int
428ether_output_frame(struct ifnet *ifp, struct mbuf *m)
429{
430#if defined(INET) || defined(INET6)
431
432 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0) {
433 if (ether_ipfw_chk(&m, ifp, 0) == 0) {
434 if (m) {
435 m_freem(m);
436 return EACCES; /* pkt dropped */
437 } else
438 return 0; /* consumed e.g. in a pipe */
439 }
440 }
441#endif
442
443 /*
444 * Queue message on interface, update output statistics if
445 * successful, and start output if interface not yet active.
446 */
447 return ((ifp->if_transmit)(ifp, m));
448}
449
450#if defined(INET) || defined(INET6)
451/*
452 * ipfw processing for ethernet packets (in and out).
453 * The second parameter is NULL from ether_demux, and ifp from
454 * ether_output_frame.
455 */
456int
457ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, int shared)
458{
459 struct ether_header *eh;
460 struct ether_header save_eh;
461 struct mbuf *m;
462 int i;
463 struct ip_fw_args args;
464 struct m_tag *mtag;
465
466 /* fetch start point from rule, if any */
467 mtag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
468 if (mtag == NULL) {
469 args.rule.slot = 0;
470 } else {
471 /* dummynet packet, already partially processed */
472 struct ipfw_rule_ref *r;
473
474 /* XXX can we free it after use ? */
475 mtag->m_tag_id = PACKET_TAG_NONE;
476 r = (struct ipfw_rule_ref *)(mtag + 1);
477 if (r->info & IPFW_ONEPASS)
478 return (1);
479 args.rule = *r;
480 }
481
482 /*
483 * I need some amt of data to be contiguous, and in case others need
484 * the packet (shared==1) also better be in the first mbuf.
485 */
486 m = *m0;
487 i = min( m->m_pkthdr.len, max_protohdr);
488 if ( shared || m->m_len < i) {
489 m = m_pullup(m, i);
490 if (m == NULL) {
491 *m0 = m;
492 return 0;
493 }
494 }
495 eh = mtod(m, struct ether_header *);
496 save_eh = *eh; /* save copy for restore below */
497 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
498
499 args.m = m; /* the packet we are looking at */
500 args.oif = dst; /* destination, if any */
501 args.next_hop = NULL; /* we do not support forward yet */
502 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
503 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
504 i = V_ip_fw_chk_ptr(&args);
505 m = args.m;
506 if (m != NULL) {
507 /*
508 * Restore Ethernet header, as needed, in case the
509 * mbuf chain was replaced by ipfw.
510 */
511 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
512 if (m == NULL) {
513 *m0 = m;
514 return 0;
515 }
516 if (eh != mtod(m, struct ether_header *))
517 bcopy(&save_eh, mtod(m, struct ether_header *),
518 ETHER_HDR_LEN);
519 }
520 *m0 = m;
521
522 if (i == IP_FW_DENY) /* drop */
523 return 0;
524
525 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
526
527 if (i == IP_FW_PASS) /* a PASS rule. */
528 return 1;
529
530 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
531 int dir;
532 /*
533 * Pass the pkt to dummynet, which consumes it.
534 * If shared, make a copy and keep the original.
535 */
536 if (shared) {
537 m = m_copypacket(m, M_DONTWAIT);
538 if (m == NULL)
539 return 0;
540 } else {
541 /*
542 * Pass the original to dummynet and
543 * nothing back to the caller
544 */
545 *m0 = NULL ;
546 }
547 dir = PROTO_LAYER2 | (dst ? DIR_OUT : DIR_IN);
548 ip_dn_io_ptr(&m, dir, &args);
549 return 0;
550 }
551 /*
552 * XXX at some point add support for divert/forward actions.
553 * If none of the above matches, we have to drop the pkt.
554 */
555 return 0;
556}
557#endif
558
559/*
560 * Process a received Ethernet packet; the packet is in the
561 * mbuf chain m with the ethernet header at the front.
562 */
563static void
564ether_input(struct ifnet *ifp, struct mbuf *m)
565{
566 struct ether_header *eh;
567 u_short etype;
568
569 if ((ifp->if_flags & IFF_UP) == 0) {
570 m_freem(m);
571 return;
572 }
573#ifdef DIAGNOSTIC
574 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
575 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
576 m_freem(m);
577 return;
578 }
579#endif
580 /*
581 * Do consistency checks to verify assumptions
582 * made by code past this point.
583 */
584 if ((m->m_flags & M_PKTHDR) == 0) {
585 if_printf(ifp, "discard frame w/o packet header\n");
586 ifp->if_ierrors++;
587 m_freem(m);
588 return;
589 }
590 if (m->m_len < ETHER_HDR_LEN) {
591 /* XXX maybe should pullup? */
592 if_printf(ifp, "discard frame w/o leading ethernet "
593 "header (len %u pkt len %u)\n",
594 m->m_len, m->m_pkthdr.len);
595 ifp->if_ierrors++;
596 m_freem(m);
597 return;
598 }
599 eh = mtod(m, struct ether_header *);
600 etype = ntohs(eh->ether_type);
601 if (m->m_pkthdr.rcvif == NULL) {
602 if_printf(ifp, "discard frame w/o interface pointer\n");
603 ifp->if_ierrors++;
604 m_freem(m);
605 return;
606 }
607#ifdef DIAGNOSTIC
608 if (m->m_pkthdr.rcvif != ifp) {
609 if_printf(ifp, "Warning, frame marked as received on %s\n",
610 m->m_pkthdr.rcvif->if_xname);
611 }
612#endif
613
614 CURVNET_SET_QUIET(ifp->if_vnet);
615
616 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
617 if (ETHER_IS_BROADCAST(eh->ether_dhost))
618 m->m_flags |= M_BCAST;
619 else
620 m->m_flags |= M_MCAST;
621 ifp->if_imcasts++;
622 }
623
624#ifdef MAC
625 /*
626 * Tag the mbuf with an appropriate MAC label before any other
627 * consumers can get to it.
628 */
629 mac_ifnet_create_mbuf(ifp, m);
630#endif
631
632 /*
633 * Give bpf a chance at the packet.
634 */
635 ETHER_BPF_MTAP(ifp, m);
636
637 /*
638 * If the CRC is still on the packet, trim it off. We do this once
639 * and once only in case we are re-entered. Nothing else on the
640 * Ethernet receive path expects to see the FCS.
641 */
642 if (m->m_flags & M_HASFCS) {
643 m_adj(m, -ETHER_CRC_LEN);
644 m->m_flags &= ~M_HASFCS;
645 }
646
647 ifp->if_ibytes += m->m_pkthdr.len;
648
649 /* Allow monitor mode to claim this frame, after stats are updated. */
650 if (ifp->if_flags & IFF_MONITOR) {
651 m_freem(m);
652 CURVNET_RESTORE();
653 return;
654 }
655
656 /* Handle input from a lagg(4) port */
657 if (ifp->if_type == IFT_IEEE8023ADLAG) {
658 KASSERT(lagg_input_p != NULL,
659 ("%s: if_lagg not loaded!", __func__));
660 m = (*lagg_input_p)(ifp, m);
661 if (m != NULL)
662 ifp = m->m_pkthdr.rcvif;
663 else
664 return;
665 }
666
667 /*
668 * If the hardware did not process an 802.1Q tag, do this now,
669 * to allow 802.1P priority frames to be passed to the main input
670 * path correctly.
671 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
672 */
673 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
674 struct ether_vlan_header *evl;
675
676 if (m->m_len < sizeof(*evl) &&
677 (m = m_pullup(m, sizeof(*evl))) == NULL) {
678#ifdef DIAGNOSTIC
679 if_printf(ifp, "cannot pullup VLAN header\n");
680#endif
681 ifp->if_ierrors++;
682 m_freem(m);
683 return;
684 }
685
686 evl = mtod(m, struct ether_vlan_header *);
687 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
688 m->m_flags |= M_VLANTAG;
689
690 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
691 ETHER_HDR_LEN - ETHER_TYPE_LEN);
692 m_adj(m, ETHER_VLAN_ENCAP_LEN);
693 }
694
695 /* Allow ng_ether(4) to claim this frame. */
696 if (IFP2AC(ifp)->ac_netgraph != NULL) {
697 KASSERT(ng_ether_input_p != NULL,
698 ("%s: ng_ether_input_p is NULL", __func__));
699 m->m_flags &= ~M_PROMISC;
700 (*ng_ether_input_p)(ifp, &m);
701 if (m == NULL) {
702 CURVNET_RESTORE();
703 return;
704 }
705 }
706
707 /*
708 * Allow if_bridge(4) to claim this frame.
709 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
710 * and the frame should be delivered locally.
711 */
712 if (ifp->if_bridge != NULL) {
713 m->m_flags &= ~M_PROMISC;
714 BRIDGE_INPUT(ifp, m);
715 if (m == NULL) {
716 CURVNET_RESTORE();
717 return;
718 }
719 }
720
721#if defined(INET) || defined(INET6)
722 /*
723 * Clear M_PROMISC on frame so that carp(4) will see it when the
724 * mbuf flows up to Layer 3.
725 * FreeBSD's implementation of carp(4) uses the inprotosw
726 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
727 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
728 * is outside the scope of the M_PROMISC test below.
729 * TODO: Maintain a hash table of ethernet addresses other than
730 * ether_dhost which may be active on this ifp.
731 */
732 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
733 m->m_flags &= ~M_PROMISC;
734 } else
735#endif
736 {
737 /*
738 * If the frame received was not for our MAC address, set the
739 * M_PROMISC flag on the mbuf chain. The frame may need to
740 * be seen by the rest of the Ethernet input path in case of
741 * re-entry (e.g. bridge, vlan, netgraph) but should not be
742 * seen by upper protocol layers.
743 */
744 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
745 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
746 m->m_flags |= M_PROMISC;
747 }
748
749 /* First chunk of an mbuf contains good entropy */
750 if (harvest.ethernet)
751 random_harvest(m, 16, 3, 0, RANDOM_NET);
752
753 ether_demux(ifp, m);
754 CURVNET_RESTORE();
755}
756
757/*
758 * Upper layer processing for a received Ethernet packet.
759 */
760void
761ether_demux(struct ifnet *ifp, struct mbuf *m)
762{
763 struct ether_header *eh;
764 int isr;
765 u_short ether_type;
766#if defined(NETATALK)
767 struct llc *l;
768#endif
769
770 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
771
772#if defined(INET) || defined(INET6)
773 /*
774 * Allow dummynet and/or ipfw to claim the frame.
775 * Do not do this for PROMISC frames in case we are re-entered.
776 */
777 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0 && !(m->m_flags & M_PROMISC)) {
778 if (ether_ipfw_chk(&m, NULL, 0) == 0) {
779 if (m)
780 m_freem(m); /* dropped; free mbuf chain */
781 return; /* consumed */
782 }
783 }
784#endif
785 eh = mtod(m, struct ether_header *);
786 ether_type = ntohs(eh->ether_type);
787
788 /*
789 * If this frame has a VLAN tag other than 0, call vlan_input()
790 * if its module is loaded. Otherwise, drop.
791 */
792 if ((m->m_flags & M_VLANTAG) &&
793 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
794 if (ifp->if_vlantrunk == NULL) {
795 ifp->if_noproto++;
796 m_freem(m);
797 return;
798 }
799 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
800 __func__));
801 /* Clear before possibly re-entering ether_input(). */
802 m->m_flags &= ~M_PROMISC;
803 (*vlan_input_p)(ifp, m);
804 return;
805 }
806
807 /*
808 * Pass promiscuously received frames to the upper layer if the user
809 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
810 */
811 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
812 m_freem(m);
813 return;
814 }
815
816 /*
817 * Reset layer specific mbuf flags to avoid confusing upper layers.
818 * Strip off Ethernet header.
819 */
820 m->m_flags &= ~M_VLANTAG;
821 m->m_flags &= ~(M_PROTOFLAGS);
822 m_adj(m, ETHER_HDR_LEN);
823
824 /*
825 * Dispatch frame to upper layer.
826 */
827 switch (ether_type) {
828#ifdef INET
829 case ETHERTYPE_IP:
830 if ((m = ip_fastforward(m)) == NULL)
831 return;
832 isr = NETISR_IP;
833 break;
834
835 case ETHERTYPE_ARP:
836 if (ifp->if_flags & IFF_NOARP) {
837 /* Discard packet if ARP is disabled on interface */
838 m_freem(m);
839 return;
840 }
841 isr = NETISR_ARP;
842 break;
843#endif
844#ifdef IPX
845 case ETHERTYPE_IPX:
846 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
847 return;
848 isr = NETISR_IPX;
849 break;
850#endif
851#ifdef INET6
852 case ETHERTYPE_IPV6:
853 isr = NETISR_IPV6;
854 break;
855#endif
856#ifdef NETATALK
857 case ETHERTYPE_AT:
858 isr = NETISR_ATALK1;
859 break;
860 case ETHERTYPE_AARP:
861 isr = NETISR_AARP;
862 break;
863#endif /* NETATALK */
864 default:
865#ifdef IPX
866 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
867 return;
868#endif /* IPX */
869#if defined(NETATALK)
870 if (ether_type > ETHERMTU)
871 goto discard;
872 l = mtod(m, struct llc *);
873 if (l->llc_dsap == LLC_SNAP_LSAP &&
874 l->llc_ssap == LLC_SNAP_LSAP &&
875 l->llc_control == LLC_UI) {
876 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
877 sizeof(at_org_code)) == 0 &&
878 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
879 m_adj(m, LLC_SNAPFRAMELEN);
880 isr = NETISR_ATALK2;
881 break;
882 }
883 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
884 sizeof(aarp_org_code)) == 0 &&
885 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
886 m_adj(m, LLC_SNAPFRAMELEN);
887 isr = NETISR_AARP;
888 break;
889 }
890 }
891#endif /* NETATALK */
892 goto discard;
893 }
894 netisr_dispatch(isr, m);
895 return;
896
897discard:
898 /*
899 * Packet is to be discarded. If netgraph is present,
900 * hand the packet to it for last chance processing;
901 * otherwise dispose of it.
902 */
903 if (IFP2AC(ifp)->ac_netgraph != NULL) {
904 KASSERT(ng_ether_input_orphan_p != NULL,
905 ("ng_ether_input_orphan_p is NULL"));
906 /*
907 * Put back the ethernet header so netgraph has a
908 * consistent view of inbound packets.
909 */
910 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
911 (*ng_ether_input_orphan_p)(ifp, m);
912 return;
913 }
914 m_freem(m);
915}
916
917/*
918 * Convert Ethernet address to printable (loggable) representation.
919 * This routine is for compatibility; it's better to just use
920 *
921 * printf("%6D", <pointer to address>, ":");
922 *
923 * since there's no static buffer involved.
924 */
925char *
926ether_sprintf(const u_char *ap)
927{
928 static char etherbuf[18];
929 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
930 return (etherbuf);
931}
932
933/*
934 * Perform common duties while attaching to interface list
935 */
936void
937ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
938{
939 int i;
940 struct ifaddr *ifa;
941 struct sockaddr_dl *sdl;
942
943 ifp->if_addrlen = ETHER_ADDR_LEN;
944 ifp->if_hdrlen = ETHER_HDR_LEN;
945 if_attach(ifp);
946 ifp->if_mtu = ETHERMTU;
947 ifp->if_output = ether_output;
948 ifp->if_input = ether_input;
949 ifp->if_resolvemulti = ether_resolvemulti;
950#ifdef VIMAGE
951 ifp->if_reassign = ether_reassign;
952#endif
953 if (ifp->if_baudrate == 0)
954 ifp->if_baudrate = IF_Mbps(10); /* just a default */
955 ifp->if_broadcastaddr = etherbroadcastaddr;
956
957 ifa = ifp->if_addr;
958 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
959 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
960 sdl->sdl_type = IFT_ETHER;
961 sdl->sdl_alen = ifp->if_addrlen;
962 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
963
964 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
965 if (ng_ether_attach_p != NULL)
966 (*ng_ether_attach_p)(ifp);
967
968 /* Announce Ethernet MAC address if non-zero. */
969 for (i = 0; i < ifp->if_addrlen; i++)
970 if (lla[i] != 0)
971 break;
972 if (i != ifp->if_addrlen)
973 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
974}
975
976/*
977 * Perform common duties while detaching an Ethernet interface
978 */
979void
980ether_ifdetach(struct ifnet *ifp)
981{
982 if (IFP2AC(ifp)->ac_netgraph != NULL) {
983 KASSERT(ng_ether_detach_p != NULL,
984 ("ng_ether_detach_p is NULL"));
985 (*ng_ether_detach_p)(ifp);
986 }
987
988 bpfdetach(ifp);
989 if_detach(ifp);
990}
991
992#ifdef VIMAGE
993void
994ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
995{
996
997 if (IFP2AC(ifp)->ac_netgraph != NULL) {
998 KASSERT(ng_ether_detach_p != NULL,
999 ("ng_ether_detach_p is NULL"));
1000 (*ng_ether_detach_p)(ifp);
1001 }
1002
1003 if (ng_ether_attach_p != NULL) {
1004 CURVNET_SET_QUIET(new_vnet);
1005 (*ng_ether_attach_p)(ifp);
1006 CURVNET_RESTORE();
1007 }
1008}
1009#endif
1010
1011SYSCTL_DECL(_net_link);
1012SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
1013#if defined(INET) || defined(INET6)
1014SYSCTL_VNET_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
1015 &VNET_NAME(ether_ipfw), 0, "Pass ether pkts through firewall");
1016#endif
1017
1018#if 0
1019/*
1020 * This is for reference. We have a table-driven version
1021 * of the little-endian crc32 generator, which is faster
1022 * than the double-loop.
1023 */
1024uint32_t
1025ether_crc32_le(const uint8_t *buf, size_t len)
1026{
1027 size_t i;
1028 uint32_t crc;
1029 int bit;
1030 uint8_t data;
1031
1032 crc = 0xffffffff; /* initial value */
1033
1034 for (i = 0; i < len; i++) {
1035 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1036 carry = (crc ^ data) & 1;
1037 crc >>= 1;
1038 if (carry)
1039 crc = (crc ^ ETHER_CRC_POLY_LE);
1040 }
1041 }
1042
1043 return (crc);
1044}
1045#else
1046uint32_t
1047ether_crc32_le(const uint8_t *buf, size_t len)
1048{
1049 static const uint32_t crctab[] = {
1050 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1051 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1052 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1053 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1054 };
1055 size_t i;
1056 uint32_t crc;
1057
1058 crc = 0xffffffff; /* initial value */
1059
1060 for (i = 0; i < len; i++) {
1061 crc ^= buf[i];
1062 crc = (crc >> 4) ^ crctab[crc & 0xf];
1063 crc = (crc >> 4) ^ crctab[crc & 0xf];
1064 }
1065
1066 return (crc);
1067}
1068#endif
1069
1070uint32_t
1071ether_crc32_be(const uint8_t *buf, size_t len)
1072{
1073 size_t i;
1074 uint32_t crc, carry;
1075 int bit;
1076 uint8_t data;
1077
1078 crc = 0xffffffff; /* initial value */
1079
1080 for (i = 0; i < len; i++) {
1081 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1082 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1083 crc <<= 1;
1084 if (carry)
1085 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1086 }
1087 }
1088
1089 return (crc);
1090}
1091
1092int
1093ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1094{
1095 struct ifaddr *ifa = (struct ifaddr *) data;
1096 struct ifreq *ifr = (struct ifreq *) data;
1097 int error = 0;
1098
1099 switch (command) {
1100 case SIOCSIFADDR:
1101 ifp->if_flags |= IFF_UP;
1102
1103 switch (ifa->ifa_addr->sa_family) {
1104#ifdef INET
1105 case AF_INET:
1106 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1107 arp_ifinit(ifp, ifa);
1108 break;
1109#endif
1110#ifdef IPX
1111 /*
1112 * XXX - This code is probably wrong
1113 */
1114 case AF_IPX:
1115 {
1116 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1117
1118 if (ipx_nullhost(*ina))
1119 ina->x_host =
1120 *(union ipx_host *)
1121 IF_LLADDR(ifp);
1122 else {
1123 bcopy((caddr_t) ina->x_host.c_host,
1124 (caddr_t) IF_LLADDR(ifp),
1125 ETHER_ADDR_LEN);
1126 }
1127
1128 /*
1129 * Set new address
1130 */
1131 ifp->if_init(ifp->if_softc);
1132 break;
1133 }
1134#endif
1135 default:
1136 ifp->if_init(ifp->if_softc);
1137 break;
1138 }
1139 break;
1140
1141 case SIOCGIFADDR:
1142 {
1143 struct sockaddr *sa;
1144
1145 sa = (struct sockaddr *) & ifr->ifr_data;
1146 bcopy(IF_LLADDR(ifp),
1147 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1148 }
1149 break;
1150
1151 case SIOCSIFMTU:
1152 /*
1153 * Set the interface MTU.
1154 */
1155 if (ifr->ifr_mtu > ETHERMTU) {
1156 error = EINVAL;
1157 } else {
1158 ifp->if_mtu = ifr->ifr_mtu;
1159 }
1160 break;
1161 default:
1162 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1163 break;
1164 }
1165 return (error);
1166}
1167
1168static int
1169ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1170 struct sockaddr *sa)
1171{
1172 struct sockaddr_dl *sdl;
1173#ifdef INET
1174 struct sockaddr_in *sin;
1175#endif
1176#ifdef INET6
1177 struct sockaddr_in6 *sin6;
1178#endif
1179 u_char *e_addr;
1180
1181 switch(sa->sa_family) {
1182 case AF_LINK:
1183 /*
1184 * No mapping needed. Just check that it's a valid MC address.
1185 */
1186 sdl = (struct sockaddr_dl *)sa;
1187 e_addr = LLADDR(sdl);
1188 if (!ETHER_IS_MULTICAST(e_addr))
1189 return EADDRNOTAVAIL;
1190 *llsa = 0;
1191 return 0;
1192
1193#ifdef INET
1194 case AF_INET:
1195 sin = (struct sockaddr_in *)sa;
1196 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1197 return EADDRNOTAVAIL;
1198 sdl = malloc(sizeof *sdl, M_IFMADDR,
1199 M_NOWAIT|M_ZERO);
1200 if (sdl == NULL)
1201 return ENOMEM;
1202 sdl->sdl_len = sizeof *sdl;
1203 sdl->sdl_family = AF_LINK;
1204 sdl->sdl_index = ifp->if_index;
1205 sdl->sdl_type = IFT_ETHER;
1206 sdl->sdl_alen = ETHER_ADDR_LEN;
1207 e_addr = LLADDR(sdl);
1208 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1209 *llsa = (struct sockaddr *)sdl;
1210 return 0;
1211#endif
1212#ifdef INET6
1213 case AF_INET6:
1214 sin6 = (struct sockaddr_in6 *)sa;
1215 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1216 /*
1217 * An IP6 address of 0 means listen to all
1218 * of the Ethernet multicast address used for IP6.
1219 * (This is used for multicast routers.)
1220 */
1221 ifp->if_flags |= IFF_ALLMULTI;
1222 *llsa = 0;
1223 return 0;
1224 }
1225 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1226 return EADDRNOTAVAIL;
1227 sdl = malloc(sizeof *sdl, M_IFMADDR,
1228 M_NOWAIT|M_ZERO);
1229 if (sdl == NULL)
1230 return (ENOMEM);
1231 sdl->sdl_len = sizeof *sdl;
1232 sdl->sdl_family = AF_LINK;
1233 sdl->sdl_index = ifp->if_index;
1234 sdl->sdl_type = IFT_ETHER;
1235 sdl->sdl_alen = ETHER_ADDR_LEN;
1236 e_addr = LLADDR(sdl);
1237 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1238 *llsa = (struct sockaddr *)sdl;
1239 return 0;
1240#endif
1241
1242 default:
1243 /*
1244 * Well, the text isn't quite right, but it's the name
1245 * that counts...
1246 */
1247 return EAFNOSUPPORT;
1248 }
1249}
1250
1251static void*
1252ether_alloc(u_char type, struct ifnet *ifp)
1253{
1254 struct arpcom *ac;
1255
1256 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1257 ac->ac_ifp = ifp;
1258
1259 return (ac);
1260}
1261
1262static void
1263ether_free(void *com, u_char type)
1264{
1265
1266 free(com, M_ARPCOM);
1267}
1268
1269static int
1270ether_modevent(module_t mod, int type, void *data)
1271{
1272
1273 switch (type) {
1274 case MOD_LOAD:
1275 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1276 break;
1277 case MOD_UNLOAD:
1278 if_deregister_com_alloc(IFT_ETHER);
1279 break;
1280 default:
1281 return EOPNOTSUPP;
1282 }
1283
1284 return (0);
1285}
1286
1287static moduledata_t ether_mod = {
1288 "ether",
1289 ether_modevent,
1290 0
1291};
1292
1293void
1294ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1295{
1296 struct ether_vlan_header vlan;
1297 struct mbuf mv, mb;
1298
1299 KASSERT((m->m_flags & M_VLANTAG) != 0,
1300 ("%s: vlan information not present", __func__));
1301 KASSERT(m->m_len >= sizeof(struct ether_header),
1302 ("%s: mbuf not large enough for header", __func__));
1303 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1304 vlan.evl_proto = vlan.evl_encap_proto;
1305 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1306 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1307 m->m_len -= sizeof(struct ether_header);
1308 m->m_data += sizeof(struct ether_header);
1309 /*
1310 * If a data link has been supplied by the caller, then we will need to
1311 * re-create a stack allocated mbuf chain with the following structure:
1312 *
1313 * (1) mbuf #1 will contain the supplied data link
1314 * (2) mbuf #2 will contain the vlan header
1315 * (3) mbuf #3 will contain the original mbuf's packet data
1316 *
1317 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1318 */
1319 if (data != NULL) {
1320 mv.m_next = m;
1321 mv.m_data = (caddr_t)&vlan;
1322 mv.m_len = sizeof(vlan);
1323 mb.m_next = &mv;
1324 mb.m_data = data;
1325 mb.m_len = dlen;
1326 bpf_mtap(bp, &mb);
1327 } else
1328 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1329 m->m_len += sizeof(struct ether_header);
1330 m->m_data -= sizeof(struct ether_header);
1331}
1332
1333struct mbuf *
1334ether_vlanencap(struct mbuf *m, uint16_t tag)
1335{
1336 struct ether_vlan_header *evl;
1337
1338 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
1339 if (m == NULL)
1340 return (NULL);
1341 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1342
1343 if (m->m_len < sizeof(*evl)) {
1344 m = m_pullup(m, sizeof(*evl));
1345 if (m == NULL)
1346 return (NULL);
1347 }
1348
1349 /*
1350 * Transform the Ethernet header into an Ethernet header
1351 * with 802.1Q encapsulation.
1352 */
1353 evl = mtod(m, struct ether_vlan_header *);
1354 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1355 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1356 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1357 evl->evl_tag = htons(tag);
1358 return (m);
1359}
1360
1361DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1362MODULE_VERSION(ether, 1);
| 148#define V_ether_ipfw VNET(ether_ipfw)
149#endif
150
151
152/*
153 * Ethernet output routine.
154 * Encapsulate a packet of type family for the local net.
155 * Use trailer local net encapsulation if enough data in first
156 * packet leaves a multiple of 512 bytes of data in remainder.
157 */
158int
159ether_output(struct ifnet *ifp, struct mbuf *m,
160 struct sockaddr *dst, struct route *ro)
161{
162 short type;
163 int error = 0, hdrcmplt = 0;
164 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN];
165 struct llentry *lle = NULL;
166 struct rtentry *rt0 = NULL;
167 struct ether_header *eh;
168 struct pf_mtag *t;
169 int loop_copy = 1;
170 int hlen; /* link layer header length */
171
172 if (ro != NULL) {
173 if (!(m->m_flags & (M_BCAST | M_MCAST)))
174 lle = ro->ro_lle;
175 rt0 = ro->ro_rt;
176 }
177#ifdef MAC
178 error = mac_ifnet_check_transmit(ifp, m);
179 if (error)
180 senderr(error);
181#endif
182
183 M_PROFILE(m);
184 if (ifp->if_flags & IFF_MONITOR)
185 senderr(ENETDOWN);
186 if (!((ifp->if_flags & IFF_UP) &&
187 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
188 senderr(ENETDOWN);
189
190 hlen = ETHER_HDR_LEN;
191 switch (dst->sa_family) {
192#ifdef INET
193 case AF_INET:
194 if (lle != NULL && (lle->la_flags & LLE_VALID))
195 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
196 else
197 error = arpresolve(ifp, rt0, m, dst, edst, &lle);
198 if (error)
199 return (error == EWOULDBLOCK ? 0 : error);
200 type = htons(ETHERTYPE_IP);
201 break;
202 case AF_ARP:
203 {
204 struct arphdr *ah;
205 ah = mtod(m, struct arphdr *);
206 ah->ar_hrd = htons(ARPHRD_ETHER);
207
208 loop_copy = 0; /* if this is for us, don't do it */
209
210 switch(ntohs(ah->ar_op)) {
211 case ARPOP_REVREQUEST:
212 case ARPOP_REVREPLY:
213 type = htons(ETHERTYPE_REVARP);
214 break;
215 case ARPOP_REQUEST:
216 case ARPOP_REPLY:
217 default:
218 type = htons(ETHERTYPE_ARP);
219 break;
220 }
221
222 if (m->m_flags & M_BCAST)
223 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN);
224 else
225 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN);
226
227 }
228 break;
229#endif
230#ifdef INET6
231 case AF_INET6:
232 if (lle != NULL && (lle->la_flags & LLE_VALID))
233 memcpy(edst, &lle->ll_addr.mac16, sizeof(edst));
234 else
235 error = nd6_storelladdr(ifp, m, dst, (u_char *)edst, &lle);
236 if (error)
237 return error;
238 type = htons(ETHERTYPE_IPV6);
239 break;
240#endif
241#ifdef IPX
242 case AF_IPX:
243 if (ef_outputp) {
244 error = ef_outputp(ifp, &m, dst, &type, &hlen);
245 if (error)
246 goto bad;
247 } else
248 type = htons(ETHERTYPE_IPX);
249 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
250 (caddr_t)edst, sizeof (edst));
251 break;
252#endif
253#ifdef NETATALK
254 case AF_APPLETALK:
255 {
256 struct at_ifaddr *aa;
257
258 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL)
259 senderr(EHOSTUNREACH); /* XXX */
260 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) {
261 ifa_free(&aa->aa_ifa);
262 return (0);
263 }
264 /*
265 * In the phase 2 case, need to prepend an mbuf for the llc header.
266 */
267 if ( aa->aa_flags & AFA_PHASE2 ) {
268 struct llc llc;
269
270 ifa_free(&aa->aa_ifa);
271 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT);
272 if (m == NULL)
273 senderr(ENOBUFS);
274 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
275 llc.llc_control = LLC_UI;
276 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
277 llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
278 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN);
279 type = htons(m->m_pkthdr.len);
280 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN;
281 } else {
282 ifa_free(&aa->aa_ifa);
283 type = htons(ETHERTYPE_AT);
284 }
285 break;
286 }
287#endif /* NETATALK */
288
289 case pseudo_AF_HDRCMPLT:
290 hdrcmplt = 1;
291 eh = (struct ether_header *)dst->sa_data;
292 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));
293 /* FALLTHROUGH */
294
295 case AF_UNSPEC:
296 loop_copy = 0; /* if this is for us, don't do it */
297 eh = (struct ether_header *)dst->sa_data;
298 (void)memcpy(edst, eh->ether_dhost, sizeof (edst));
299 type = eh->ether_type;
300 break;
301
302 default:
303 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
304 senderr(EAFNOSUPPORT);
305 }
306
307 if (lle != NULL && (lle->la_flags & LLE_IFADDR)) {
308 int csum_flags = 0;
309 if (m->m_pkthdr.csum_flags & CSUM_IP)
310 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
311 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
312 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
313 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
314 csum_flags |= CSUM_SCTP_VALID;
315 m->m_pkthdr.csum_flags |= csum_flags;
316 m->m_pkthdr.csum_data = 0xffff;
317 return (if_simloop(ifp, m, dst->sa_family, 0));
318 }
319
320 /*
321 * Add local net header. If no space in first mbuf,
322 * allocate another.
323 */
324 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
325 if (m == NULL)
326 senderr(ENOBUFS);
327 eh = mtod(m, struct ether_header *);
328 (void)memcpy(&eh->ether_type, &type,
329 sizeof(eh->ether_type));
330 (void)memcpy(eh->ether_dhost, edst, sizeof (edst));
331 if (hdrcmplt)
332 (void)memcpy(eh->ether_shost, esrc,
333 sizeof(eh->ether_shost));
334 else
335 (void)memcpy(eh->ether_shost, IF_LLADDR(ifp),
336 sizeof(eh->ether_shost));
337
338 /*
339 * If a simplex interface, and the packet is being sent to our
340 * Ethernet address or a broadcast address, loopback a copy.
341 * XXX To make a simplex device behave exactly like a duplex
342 * device, we should copy in the case of sending to our own
343 * ethernet address (thus letting the original actually appear
344 * on the wire). However, we don't do that here for security
345 * reasons and compatibility with the original behavior.
346 */
347 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy &&
348 ((t = pf_find_mtag(m)) == NULL || !t->routed)) {
349 int csum_flags = 0;
350
351 if (m->m_pkthdr.csum_flags & CSUM_IP)
352 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
353 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
354 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
355 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
356 csum_flags |= CSUM_SCTP_VALID;
357
358 if (m->m_flags & M_BCAST) {
359 struct mbuf *n;
360
361 /*
362 * Because if_simloop() modifies the packet, we need a
363 * writable copy through m_dup() instead of a readonly
364 * one as m_copy[m] would give us. The alternative would
365 * be to modify if_simloop() to handle the readonly mbuf,
366 * but performancewise it is mostly equivalent (trading
367 * extra data copying vs. extra locking).
368 *
369 * XXX This is a local workaround. A number of less
370 * often used kernel parts suffer from the same bug.
371 * See PR kern/105943 for a proposed general solution.
372 */
373 if ((n = m_dup(m, M_DONTWAIT)) != NULL) {
374 n->m_pkthdr.csum_flags |= csum_flags;
375 if (csum_flags & CSUM_DATA_VALID)
376 n->m_pkthdr.csum_data = 0xffff;
377 (void)if_simloop(ifp, n, dst->sa_family, hlen);
378 } else
379 ifp->if_iqdrops++;
380 } else if (bcmp(eh->ether_dhost, eh->ether_shost,
381 ETHER_ADDR_LEN) == 0) {
382 m->m_pkthdr.csum_flags |= csum_flags;
383 if (csum_flags & CSUM_DATA_VALID)
384 m->m_pkthdr.csum_data = 0xffff;
385 (void) if_simloop(ifp, m, dst->sa_family, hlen);
386 return (0); /* XXX */
387 }
388 }
389
390 /*
391 * Bridges require special output handling.
392 */
393 if (ifp->if_bridge) {
394 BRIDGE_OUTPUT(ifp, m, error);
395 return (error);
396 }
397
398#if defined(INET) || defined(INET6)
399 if (ifp->if_carp &&
400 (error = (*carp_output_p)(ifp, m, dst, NULL)))
401 goto bad;
402#endif
403
404 /* Handle ng_ether(4) processing, if any */
405 if (IFP2AC(ifp)->ac_netgraph != NULL) {
406 KASSERT(ng_ether_output_p != NULL,
407 ("ng_ether_output_p is NULL"));
408 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
409bad: if (m != NULL)
410 m_freem(m);
411 return (error);
412 }
413 if (m == NULL)
414 return (0);
415 }
416
417 /* Continue with link-layer output */
418 return ether_output_frame(ifp, m);
419}
420
421/*
422 * Ethernet link layer output routine to send a raw frame to the device.
423 *
424 * This assumes that the 14 byte Ethernet header is present and contiguous
425 * in the first mbuf (if BRIDGE'ing).
426 */
427int
428ether_output_frame(struct ifnet *ifp, struct mbuf *m)
429{
430#if defined(INET) || defined(INET6)
431
432 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0) {
433 if (ether_ipfw_chk(&m, ifp, 0) == 0) {
434 if (m) {
435 m_freem(m);
436 return EACCES; /* pkt dropped */
437 } else
438 return 0; /* consumed e.g. in a pipe */
439 }
440 }
441#endif
442
443 /*
444 * Queue message on interface, update output statistics if
445 * successful, and start output if interface not yet active.
446 */
447 return ((ifp->if_transmit)(ifp, m));
448}
449
450#if defined(INET) || defined(INET6)
451/*
452 * ipfw processing for ethernet packets (in and out).
453 * The second parameter is NULL from ether_demux, and ifp from
454 * ether_output_frame.
455 */
456int
457ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, int shared)
458{
459 struct ether_header *eh;
460 struct ether_header save_eh;
461 struct mbuf *m;
462 int i;
463 struct ip_fw_args args;
464 struct m_tag *mtag;
465
466 /* fetch start point from rule, if any */
467 mtag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
468 if (mtag == NULL) {
469 args.rule.slot = 0;
470 } else {
471 /* dummynet packet, already partially processed */
472 struct ipfw_rule_ref *r;
473
474 /* XXX can we free it after use ? */
475 mtag->m_tag_id = PACKET_TAG_NONE;
476 r = (struct ipfw_rule_ref *)(mtag + 1);
477 if (r->info & IPFW_ONEPASS)
478 return (1);
479 args.rule = *r;
480 }
481
482 /*
483 * I need some amt of data to be contiguous, and in case others need
484 * the packet (shared==1) also better be in the first mbuf.
485 */
486 m = *m0;
487 i = min( m->m_pkthdr.len, max_protohdr);
488 if ( shared || m->m_len < i) {
489 m = m_pullup(m, i);
490 if (m == NULL) {
491 *m0 = m;
492 return 0;
493 }
494 }
495 eh = mtod(m, struct ether_header *);
496 save_eh = *eh; /* save copy for restore below */
497 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
498
499 args.m = m; /* the packet we are looking at */
500 args.oif = dst; /* destination, if any */
501 args.next_hop = NULL; /* we do not support forward yet */
502 args.eh = &save_eh; /* MAC header for bridged/MAC packets */
503 args.inp = NULL; /* used by ipfw uid/gid/jail rules */
504 i = V_ip_fw_chk_ptr(&args);
505 m = args.m;
506 if (m != NULL) {
507 /*
508 * Restore Ethernet header, as needed, in case the
509 * mbuf chain was replaced by ipfw.
510 */
511 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
512 if (m == NULL) {
513 *m0 = m;
514 return 0;
515 }
516 if (eh != mtod(m, struct ether_header *))
517 bcopy(&save_eh, mtod(m, struct ether_header *),
518 ETHER_HDR_LEN);
519 }
520 *m0 = m;
521
522 if (i == IP_FW_DENY) /* drop */
523 return 0;
524
525 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL"));
526
527 if (i == IP_FW_PASS) /* a PASS rule. */
528 return 1;
529
530 if (ip_dn_io_ptr && (i == IP_FW_DUMMYNET)) {
531 int dir;
532 /*
533 * Pass the pkt to dummynet, which consumes it.
534 * If shared, make a copy and keep the original.
535 */
536 if (shared) {
537 m = m_copypacket(m, M_DONTWAIT);
538 if (m == NULL)
539 return 0;
540 } else {
541 /*
542 * Pass the original to dummynet and
543 * nothing back to the caller
544 */
545 *m0 = NULL ;
546 }
547 dir = PROTO_LAYER2 | (dst ? DIR_OUT : DIR_IN);
548 ip_dn_io_ptr(&m, dir, &args);
549 return 0;
550 }
551 /*
552 * XXX at some point add support for divert/forward actions.
553 * If none of the above matches, we have to drop the pkt.
554 */
555 return 0;
556}
557#endif
558
559/*
560 * Process a received Ethernet packet; the packet is in the
561 * mbuf chain m with the ethernet header at the front.
562 */
563static void
564ether_input(struct ifnet *ifp, struct mbuf *m)
565{
566 struct ether_header *eh;
567 u_short etype;
568
569 if ((ifp->if_flags & IFF_UP) == 0) {
570 m_freem(m);
571 return;
572 }
573#ifdef DIAGNOSTIC
574 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
575 if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
576 m_freem(m);
577 return;
578 }
579#endif
580 /*
581 * Do consistency checks to verify assumptions
582 * made by code past this point.
583 */
584 if ((m->m_flags & M_PKTHDR) == 0) {
585 if_printf(ifp, "discard frame w/o packet header\n");
586 ifp->if_ierrors++;
587 m_freem(m);
588 return;
589 }
590 if (m->m_len < ETHER_HDR_LEN) {
591 /* XXX maybe should pullup? */
592 if_printf(ifp, "discard frame w/o leading ethernet "
593 "header (len %u pkt len %u)\n",
594 m->m_len, m->m_pkthdr.len);
595 ifp->if_ierrors++;
596 m_freem(m);
597 return;
598 }
599 eh = mtod(m, struct ether_header *);
600 etype = ntohs(eh->ether_type);
601 if (m->m_pkthdr.rcvif == NULL) {
602 if_printf(ifp, "discard frame w/o interface pointer\n");
603 ifp->if_ierrors++;
604 m_freem(m);
605 return;
606 }
607#ifdef DIAGNOSTIC
608 if (m->m_pkthdr.rcvif != ifp) {
609 if_printf(ifp, "Warning, frame marked as received on %s\n",
610 m->m_pkthdr.rcvif->if_xname);
611 }
612#endif
613
614 CURVNET_SET_QUIET(ifp->if_vnet);
615
616 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
617 if (ETHER_IS_BROADCAST(eh->ether_dhost))
618 m->m_flags |= M_BCAST;
619 else
620 m->m_flags |= M_MCAST;
621 ifp->if_imcasts++;
622 }
623
624#ifdef MAC
625 /*
626 * Tag the mbuf with an appropriate MAC label before any other
627 * consumers can get to it.
628 */
629 mac_ifnet_create_mbuf(ifp, m);
630#endif
631
632 /*
633 * Give bpf a chance at the packet.
634 */
635 ETHER_BPF_MTAP(ifp, m);
636
637 /*
638 * If the CRC is still on the packet, trim it off. We do this once
639 * and once only in case we are re-entered. Nothing else on the
640 * Ethernet receive path expects to see the FCS.
641 */
642 if (m->m_flags & M_HASFCS) {
643 m_adj(m, -ETHER_CRC_LEN);
644 m->m_flags &= ~M_HASFCS;
645 }
646
647 ifp->if_ibytes += m->m_pkthdr.len;
648
649 /* Allow monitor mode to claim this frame, after stats are updated. */
650 if (ifp->if_flags & IFF_MONITOR) {
651 m_freem(m);
652 CURVNET_RESTORE();
653 return;
654 }
655
656 /* Handle input from a lagg(4) port */
657 if (ifp->if_type == IFT_IEEE8023ADLAG) {
658 KASSERT(lagg_input_p != NULL,
659 ("%s: if_lagg not loaded!", __func__));
660 m = (*lagg_input_p)(ifp, m);
661 if (m != NULL)
662 ifp = m->m_pkthdr.rcvif;
663 else
664 return;
665 }
666
667 /*
668 * If the hardware did not process an 802.1Q tag, do this now,
669 * to allow 802.1P priority frames to be passed to the main input
670 * path correctly.
671 * TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
672 */
673 if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
674 struct ether_vlan_header *evl;
675
676 if (m->m_len < sizeof(*evl) &&
677 (m = m_pullup(m, sizeof(*evl))) == NULL) {
678#ifdef DIAGNOSTIC
679 if_printf(ifp, "cannot pullup VLAN header\n");
680#endif
681 ifp->if_ierrors++;
682 m_freem(m);
683 return;
684 }
685
686 evl = mtod(m, struct ether_vlan_header *);
687 m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
688 m->m_flags |= M_VLANTAG;
689
690 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
691 ETHER_HDR_LEN - ETHER_TYPE_LEN);
692 m_adj(m, ETHER_VLAN_ENCAP_LEN);
693 }
694
695 /* Allow ng_ether(4) to claim this frame. */
696 if (IFP2AC(ifp)->ac_netgraph != NULL) {
697 KASSERT(ng_ether_input_p != NULL,
698 ("%s: ng_ether_input_p is NULL", __func__));
699 m->m_flags &= ~M_PROMISC;
700 (*ng_ether_input_p)(ifp, &m);
701 if (m == NULL) {
702 CURVNET_RESTORE();
703 return;
704 }
705 }
706
707 /*
708 * Allow if_bridge(4) to claim this frame.
709 * The BRIDGE_INPUT() macro will update ifp if the bridge changed it
710 * and the frame should be delivered locally.
711 */
712 if (ifp->if_bridge != NULL) {
713 m->m_flags &= ~M_PROMISC;
714 BRIDGE_INPUT(ifp, m);
715 if (m == NULL) {
716 CURVNET_RESTORE();
717 return;
718 }
719 }
720
721#if defined(INET) || defined(INET6)
722 /*
723 * Clear M_PROMISC on frame so that carp(4) will see it when the
724 * mbuf flows up to Layer 3.
725 * FreeBSD's implementation of carp(4) uses the inprotosw
726 * to dispatch IPPROTO_CARP. carp(4) also allocates its own
727 * Ethernet addresses of the form 00:00:5e:00:01:xx, which
728 * is outside the scope of the M_PROMISC test below.
729 * TODO: Maintain a hash table of ethernet addresses other than
730 * ether_dhost which may be active on this ifp.
731 */
732 if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
733 m->m_flags &= ~M_PROMISC;
734 } else
735#endif
736 {
737 /*
738 * If the frame received was not for our MAC address, set the
739 * M_PROMISC flag on the mbuf chain. The frame may need to
740 * be seen by the rest of the Ethernet input path in case of
741 * re-entry (e.g. bridge, vlan, netgraph) but should not be
742 * seen by upper protocol layers.
743 */
744 if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
745 bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
746 m->m_flags |= M_PROMISC;
747 }
748
749 /* First chunk of an mbuf contains good entropy */
750 if (harvest.ethernet)
751 random_harvest(m, 16, 3, 0, RANDOM_NET);
752
753 ether_demux(ifp, m);
754 CURVNET_RESTORE();
755}
756
757/*
758 * Upper layer processing for a received Ethernet packet.
759 */
760void
761ether_demux(struct ifnet *ifp, struct mbuf *m)
762{
763 struct ether_header *eh;
764 int isr;
765 u_short ether_type;
766#if defined(NETATALK)
767 struct llc *l;
768#endif
769
770 KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
771
772#if defined(INET) || defined(INET6)
773 /*
774 * Allow dummynet and/or ipfw to claim the frame.
775 * Do not do this for PROMISC frames in case we are re-entered.
776 */
777 if (V_ip_fw_chk_ptr && V_ether_ipfw != 0 && !(m->m_flags & M_PROMISC)) {
778 if (ether_ipfw_chk(&m, NULL, 0) == 0) {
779 if (m)
780 m_freem(m); /* dropped; free mbuf chain */
781 return; /* consumed */
782 }
783 }
784#endif
785 eh = mtod(m, struct ether_header *);
786 ether_type = ntohs(eh->ether_type);
787
788 /*
789 * If this frame has a VLAN tag other than 0, call vlan_input()
790 * if its module is loaded. Otherwise, drop.
791 */
792 if ((m->m_flags & M_VLANTAG) &&
793 EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
794 if (ifp->if_vlantrunk == NULL) {
795 ifp->if_noproto++;
796 m_freem(m);
797 return;
798 }
799 KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
800 __func__));
801 /* Clear before possibly re-entering ether_input(). */
802 m->m_flags &= ~M_PROMISC;
803 (*vlan_input_p)(ifp, m);
804 return;
805 }
806
807 /*
808 * Pass promiscuously received frames to the upper layer if the user
809 * requested this by setting IFF_PPROMISC. Otherwise, drop them.
810 */
811 if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
812 m_freem(m);
813 return;
814 }
815
816 /*
817 * Reset layer specific mbuf flags to avoid confusing upper layers.
818 * Strip off Ethernet header.
819 */
820 m->m_flags &= ~M_VLANTAG;
821 m->m_flags &= ~(M_PROTOFLAGS);
822 m_adj(m, ETHER_HDR_LEN);
823
824 /*
825 * Dispatch frame to upper layer.
826 */
827 switch (ether_type) {
828#ifdef INET
829 case ETHERTYPE_IP:
830 if ((m = ip_fastforward(m)) == NULL)
831 return;
832 isr = NETISR_IP;
833 break;
834
835 case ETHERTYPE_ARP:
836 if (ifp->if_flags & IFF_NOARP) {
837 /* Discard packet if ARP is disabled on interface */
838 m_freem(m);
839 return;
840 }
841 isr = NETISR_ARP;
842 break;
843#endif
844#ifdef IPX
845 case ETHERTYPE_IPX:
846 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
847 return;
848 isr = NETISR_IPX;
849 break;
850#endif
851#ifdef INET6
852 case ETHERTYPE_IPV6:
853 isr = NETISR_IPV6;
854 break;
855#endif
856#ifdef NETATALK
857 case ETHERTYPE_AT:
858 isr = NETISR_ATALK1;
859 break;
860 case ETHERTYPE_AARP:
861 isr = NETISR_AARP;
862 break;
863#endif /* NETATALK */
864 default:
865#ifdef IPX
866 if (ef_inputp && ef_inputp(ifp, eh, m) == 0)
867 return;
868#endif /* IPX */
869#if defined(NETATALK)
870 if (ether_type > ETHERMTU)
871 goto discard;
872 l = mtod(m, struct llc *);
873 if (l->llc_dsap == LLC_SNAP_LSAP &&
874 l->llc_ssap == LLC_SNAP_LSAP &&
875 l->llc_control == LLC_UI) {
876 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code,
877 sizeof(at_org_code)) == 0 &&
878 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
879 m_adj(m, LLC_SNAPFRAMELEN);
880 isr = NETISR_ATALK2;
881 break;
882 }
883 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
884 sizeof(aarp_org_code)) == 0 &&
885 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
886 m_adj(m, LLC_SNAPFRAMELEN);
887 isr = NETISR_AARP;
888 break;
889 }
890 }
891#endif /* NETATALK */
892 goto discard;
893 }
894 netisr_dispatch(isr, m);
895 return;
896
897discard:
898 /*
899 * Packet is to be discarded. If netgraph is present,
900 * hand the packet to it for last chance processing;
901 * otherwise dispose of it.
902 */
903 if (IFP2AC(ifp)->ac_netgraph != NULL) {
904 KASSERT(ng_ether_input_orphan_p != NULL,
905 ("ng_ether_input_orphan_p is NULL"));
906 /*
907 * Put back the ethernet header so netgraph has a
908 * consistent view of inbound packets.
909 */
910 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
911 (*ng_ether_input_orphan_p)(ifp, m);
912 return;
913 }
914 m_freem(m);
915}
916
917/*
918 * Convert Ethernet address to printable (loggable) representation.
919 * This routine is for compatibility; it's better to just use
920 *
921 * printf("%6D", <pointer to address>, ":");
922 *
923 * since there's no static buffer involved.
924 */
925char *
926ether_sprintf(const u_char *ap)
927{
928 static char etherbuf[18];
929 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
930 return (etherbuf);
931}
932
933/*
934 * Perform common duties while attaching to interface list
935 */
936void
937ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
938{
939 int i;
940 struct ifaddr *ifa;
941 struct sockaddr_dl *sdl;
942
943 ifp->if_addrlen = ETHER_ADDR_LEN;
944 ifp->if_hdrlen = ETHER_HDR_LEN;
945 if_attach(ifp);
946 ifp->if_mtu = ETHERMTU;
947 ifp->if_output = ether_output;
948 ifp->if_input = ether_input;
949 ifp->if_resolvemulti = ether_resolvemulti;
950#ifdef VIMAGE
951 ifp->if_reassign = ether_reassign;
952#endif
953 if (ifp->if_baudrate == 0)
954 ifp->if_baudrate = IF_Mbps(10); /* just a default */
955 ifp->if_broadcastaddr = etherbroadcastaddr;
956
957 ifa = ifp->if_addr;
958 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
959 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
960 sdl->sdl_type = IFT_ETHER;
961 sdl->sdl_alen = ifp->if_addrlen;
962 bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
963
964 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
965 if (ng_ether_attach_p != NULL)
966 (*ng_ether_attach_p)(ifp);
967
968 /* Announce Ethernet MAC address if non-zero. */
969 for (i = 0; i < ifp->if_addrlen; i++)
970 if (lla[i] != 0)
971 break;
972 if (i != ifp->if_addrlen)
973 if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
974}
975
976/*
977 * Perform common duties while detaching an Ethernet interface
978 */
979void
980ether_ifdetach(struct ifnet *ifp)
981{
982 if (IFP2AC(ifp)->ac_netgraph != NULL) {
983 KASSERT(ng_ether_detach_p != NULL,
984 ("ng_ether_detach_p is NULL"));
985 (*ng_ether_detach_p)(ifp);
986 }
987
988 bpfdetach(ifp);
989 if_detach(ifp);
990}
991
992#ifdef VIMAGE
993void
994ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
995{
996
997 if (IFP2AC(ifp)->ac_netgraph != NULL) {
998 KASSERT(ng_ether_detach_p != NULL,
999 ("ng_ether_detach_p is NULL"));
1000 (*ng_ether_detach_p)(ifp);
1001 }
1002
1003 if (ng_ether_attach_p != NULL) {
1004 CURVNET_SET_QUIET(new_vnet);
1005 (*ng_ether_attach_p)(ifp);
1006 CURVNET_RESTORE();
1007 }
1008}
1009#endif
1010
1011SYSCTL_DECL(_net_link);
1012SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
1013#if defined(INET) || defined(INET6)
1014SYSCTL_VNET_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
1015 &VNET_NAME(ether_ipfw), 0, "Pass ether pkts through firewall");
1016#endif
1017
1018#if 0
1019/*
1020 * This is for reference. We have a table-driven version
1021 * of the little-endian crc32 generator, which is faster
1022 * than the double-loop.
1023 */
1024uint32_t
1025ether_crc32_le(const uint8_t *buf, size_t len)
1026{
1027 size_t i;
1028 uint32_t crc;
1029 int bit;
1030 uint8_t data;
1031
1032 crc = 0xffffffff; /* initial value */
1033
1034 for (i = 0; i < len; i++) {
1035 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1036 carry = (crc ^ data) & 1;
1037 crc >>= 1;
1038 if (carry)
1039 crc = (crc ^ ETHER_CRC_POLY_LE);
1040 }
1041 }
1042
1043 return (crc);
1044}
1045#else
1046uint32_t
1047ether_crc32_le(const uint8_t *buf, size_t len)
1048{
1049 static const uint32_t crctab[] = {
1050 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1051 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1052 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1053 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1054 };
1055 size_t i;
1056 uint32_t crc;
1057
1058 crc = 0xffffffff; /* initial value */
1059
1060 for (i = 0; i < len; i++) {
1061 crc ^= buf[i];
1062 crc = (crc >> 4) ^ crctab[crc & 0xf];
1063 crc = (crc >> 4) ^ crctab[crc & 0xf];
1064 }
1065
1066 return (crc);
1067}
1068#endif
1069
1070uint32_t
1071ether_crc32_be(const uint8_t *buf, size_t len)
1072{
1073 size_t i;
1074 uint32_t crc, carry;
1075 int bit;
1076 uint8_t data;
1077
1078 crc = 0xffffffff; /* initial value */
1079
1080 for (i = 0; i < len; i++) {
1081 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
1082 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
1083 crc <<= 1;
1084 if (carry)
1085 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1086 }
1087 }
1088
1089 return (crc);
1090}
1091
1092int
1093ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1094{
1095 struct ifaddr *ifa = (struct ifaddr *) data;
1096 struct ifreq *ifr = (struct ifreq *) data;
1097 int error = 0;
1098
1099 switch (command) {
1100 case SIOCSIFADDR:
1101 ifp->if_flags |= IFF_UP;
1102
1103 switch (ifa->ifa_addr->sa_family) {
1104#ifdef INET
1105 case AF_INET:
1106 ifp->if_init(ifp->if_softc); /* before arpwhohas */
1107 arp_ifinit(ifp, ifa);
1108 break;
1109#endif
1110#ifdef IPX
1111 /*
1112 * XXX - This code is probably wrong
1113 */
1114 case AF_IPX:
1115 {
1116 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1117
1118 if (ipx_nullhost(*ina))
1119 ina->x_host =
1120 *(union ipx_host *)
1121 IF_LLADDR(ifp);
1122 else {
1123 bcopy((caddr_t) ina->x_host.c_host,
1124 (caddr_t) IF_LLADDR(ifp),
1125 ETHER_ADDR_LEN);
1126 }
1127
1128 /*
1129 * Set new address
1130 */
1131 ifp->if_init(ifp->if_softc);
1132 break;
1133 }
1134#endif
1135 default:
1136 ifp->if_init(ifp->if_softc);
1137 break;
1138 }
1139 break;
1140
1141 case SIOCGIFADDR:
1142 {
1143 struct sockaddr *sa;
1144
1145 sa = (struct sockaddr *) & ifr->ifr_data;
1146 bcopy(IF_LLADDR(ifp),
1147 (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1148 }
1149 break;
1150
1151 case SIOCSIFMTU:
1152 /*
1153 * Set the interface MTU.
1154 */
1155 if (ifr->ifr_mtu > ETHERMTU) {
1156 error = EINVAL;
1157 } else {
1158 ifp->if_mtu = ifr->ifr_mtu;
1159 }
1160 break;
1161 default:
1162 error = EINVAL; /* XXX netbsd has ENOTTY??? */
1163 break;
1164 }
1165 return (error);
1166}
1167
1168static int
1169ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
1170 struct sockaddr *sa)
1171{
1172 struct sockaddr_dl *sdl;
1173#ifdef INET
1174 struct sockaddr_in *sin;
1175#endif
1176#ifdef INET6
1177 struct sockaddr_in6 *sin6;
1178#endif
1179 u_char *e_addr;
1180
1181 switch(sa->sa_family) {
1182 case AF_LINK:
1183 /*
1184 * No mapping needed. Just check that it's a valid MC address.
1185 */
1186 sdl = (struct sockaddr_dl *)sa;
1187 e_addr = LLADDR(sdl);
1188 if (!ETHER_IS_MULTICAST(e_addr))
1189 return EADDRNOTAVAIL;
1190 *llsa = 0;
1191 return 0;
1192
1193#ifdef INET
1194 case AF_INET:
1195 sin = (struct sockaddr_in *)sa;
1196 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
1197 return EADDRNOTAVAIL;
1198 sdl = malloc(sizeof *sdl, M_IFMADDR,
1199 M_NOWAIT|M_ZERO);
1200 if (sdl == NULL)
1201 return ENOMEM;
1202 sdl->sdl_len = sizeof *sdl;
1203 sdl->sdl_family = AF_LINK;
1204 sdl->sdl_index = ifp->if_index;
1205 sdl->sdl_type = IFT_ETHER;
1206 sdl->sdl_alen = ETHER_ADDR_LEN;
1207 e_addr = LLADDR(sdl);
1208 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
1209 *llsa = (struct sockaddr *)sdl;
1210 return 0;
1211#endif
1212#ifdef INET6
1213 case AF_INET6:
1214 sin6 = (struct sockaddr_in6 *)sa;
1215 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1216 /*
1217 * An IP6 address of 0 means listen to all
1218 * of the Ethernet multicast address used for IP6.
1219 * (This is used for multicast routers.)
1220 */
1221 ifp->if_flags |= IFF_ALLMULTI;
1222 *llsa = 0;
1223 return 0;
1224 }
1225 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
1226 return EADDRNOTAVAIL;
1227 sdl = malloc(sizeof *sdl, M_IFMADDR,
1228 M_NOWAIT|M_ZERO);
1229 if (sdl == NULL)
1230 return (ENOMEM);
1231 sdl->sdl_len = sizeof *sdl;
1232 sdl->sdl_family = AF_LINK;
1233 sdl->sdl_index = ifp->if_index;
1234 sdl->sdl_type = IFT_ETHER;
1235 sdl->sdl_alen = ETHER_ADDR_LEN;
1236 e_addr = LLADDR(sdl);
1237 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
1238 *llsa = (struct sockaddr *)sdl;
1239 return 0;
1240#endif
1241
1242 default:
1243 /*
1244 * Well, the text isn't quite right, but it's the name
1245 * that counts...
1246 */
1247 return EAFNOSUPPORT;
1248 }
1249}
1250
1251static void*
1252ether_alloc(u_char type, struct ifnet *ifp)
1253{
1254 struct arpcom *ac;
1255
1256 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO);
1257 ac->ac_ifp = ifp;
1258
1259 return (ac);
1260}
1261
1262static void
1263ether_free(void *com, u_char type)
1264{
1265
1266 free(com, M_ARPCOM);
1267}
1268
1269static int
1270ether_modevent(module_t mod, int type, void *data)
1271{
1272
1273 switch (type) {
1274 case MOD_LOAD:
1275 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free);
1276 break;
1277 case MOD_UNLOAD:
1278 if_deregister_com_alloc(IFT_ETHER);
1279 break;
1280 default:
1281 return EOPNOTSUPP;
1282 }
1283
1284 return (0);
1285}
1286
1287static moduledata_t ether_mod = {
1288 "ether",
1289 ether_modevent,
1290 0
1291};
1292
1293void
1294ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
1295{
1296 struct ether_vlan_header vlan;
1297 struct mbuf mv, mb;
1298
1299 KASSERT((m->m_flags & M_VLANTAG) != 0,
1300 ("%s: vlan information not present", __func__));
1301 KASSERT(m->m_len >= sizeof(struct ether_header),
1302 ("%s: mbuf not large enough for header", __func__));
1303 bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
1304 vlan.evl_proto = vlan.evl_encap_proto;
1305 vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
1306 vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
1307 m->m_len -= sizeof(struct ether_header);
1308 m->m_data += sizeof(struct ether_header);
1309 /*
1310 * If a data link has been supplied by the caller, then we will need to
1311 * re-create a stack allocated mbuf chain with the following structure:
1312 *
1313 * (1) mbuf #1 will contain the supplied data link
1314 * (2) mbuf #2 will contain the vlan header
1315 * (3) mbuf #3 will contain the original mbuf's packet data
1316 *
1317 * Otherwise, submit the packet and vlan header via bpf_mtap2().
1318 */
1319 if (data != NULL) {
1320 mv.m_next = m;
1321 mv.m_data = (caddr_t)&vlan;
1322 mv.m_len = sizeof(vlan);
1323 mb.m_next = &mv;
1324 mb.m_data = data;
1325 mb.m_len = dlen;
1326 bpf_mtap(bp, &mb);
1327 } else
1328 bpf_mtap2(bp, &vlan, sizeof(vlan), m);
1329 m->m_len += sizeof(struct ether_header);
1330 m->m_data -= sizeof(struct ether_header);
1331}
1332
1333struct mbuf *
1334ether_vlanencap(struct mbuf *m, uint16_t tag)
1335{
1336 struct ether_vlan_header *evl;
1337
1338 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
1339 if (m == NULL)
1340 return (NULL);
1341 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
1342
1343 if (m->m_len < sizeof(*evl)) {
1344 m = m_pullup(m, sizeof(*evl));
1345 if (m == NULL)
1346 return (NULL);
1347 }
1348
1349 /*
1350 * Transform the Ethernet header into an Ethernet header
1351 * with 802.1Q encapsulation.
1352 */
1353 evl = mtod(m, struct ether_vlan_header *);
1354 bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
1355 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1356 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1357 evl->evl_tag = htons(tag);
1358 return (m);
1359}
1360
1361DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
1362MODULE_VERSION(ether, 1);
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