1/* $NetBSD: if_ethersubr.c,v 1.229 2016/10/18 07:30:30 ozaki-r 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 1.229 2016/10/18 07:30:30 ozaki-r Exp $");
65
66#ifdef _KERNEL_OPT
67#include "opt_inet.h"
68#include "opt_atalk.h"
69#include "opt_mbuftrace.h"
70#include "opt_mpls.h"
71#include "opt_gateway.h"
72#include "opt_pppoe.h"
73#include "opt_net_mpsafe.h"
74#endif
75
76#include "vlan.h"
77#include "pppoe.h"
78#include "bridge.h"
79#include "arp.h"
80#include "agr.h"
81
82#include <sys/sysctl.h>
83#include <sys/malloc.h>
84#include <sys/mbuf.h>
85#include <sys/mutex.h>
86#include <sys/ioctl.h>
87#include <sys/errno.h>
88#include <sys/device.h>
89#include <sys/rnd.h>
90#include <sys/rndsource.h>
91#include <sys/cpu.h>
92
93#include <net/if.h>
94#include <net/netisr.h>
95#include <net/route.h>
96#include <net/if_llc.h>
97#include <net/if_dl.h>
98#include <net/if_types.h>
99#include <net/pktqueue.h>
100
101#include <net/if_media.h>
102#include <dev/mii/mii.h>
103#include <dev/mii/miivar.h>
104
105#if NARP == 0
106/*
107 * XXX there should really be a way to issue this warning from within config(8)
108 */
109#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.
110#endif
111
112#include <net/bpf.h>
113
114#include <net/if_ether.h>
115#include <net/if_vlanvar.h>
116
117#if NPPPOE > 0
118#include <net/if_pppoe.h>
119#endif
120
121#if NAGR > 0
122#include <net/agr/ieee8023_slowprotocols.h> /* XXX */
123#include <net/agr/ieee8023ad.h>
124#include <net/agr/if_agrvar.h>
125#endif
126
127#if NBRIDGE > 0
128#include <net/if_bridgevar.h>
129#endif
130
131#include <netinet/in.h>
132#ifdef INET
133#include <netinet/in_var.h>
134#endif
135#include <netinet/if_inarp.h>
136
137#ifdef INET6
138#ifndef INET
139#include <netinet/in.h>
140#endif
141#include <netinet6/in6_var.h>
142#include <netinet6/nd6.h>
143#endif
144
145
146#include "carp.h"
147#if NCARP > 0
148#include <netinet/ip_carp.h>
149#endif
150
151#ifdef NETATALK
152#include <netatalk/at.h>
153#include <netatalk/at_var.h>
154#include <netatalk/at_extern.h>
155
156#define llc_snap_org_code llc_un.type_snap.org_code
157#define llc_snap_ether_type llc_un.type_snap.ether_type
158
159extern u_char at_org_code[3];
160extern u_char aarp_org_code[3];
161#endif /* NETATALK */
162
163#ifdef MPLS
164#include <netmpls/mpls.h>
165#include <netmpls/mpls_var.h>
166#endif
167
168static struct timeval bigpktppslim_last;
169static int bigpktppslim = 2; /* XXX */
170static int bigpktpps_count;
171static kmutex_t bigpktpps_lock __cacheline_aligned;
172
173
174const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] =
175 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
176const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
177 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
178#define senderr(e) { error = (e); goto bad;}
179
180static int ether_output(struct ifnet *, struct mbuf *,
181 const struct sockaddr *, const struct rtentry *);
182
183/*
184 * Ethernet output routine.
185 * Encapsulate a packet of type family for the local net.
186 * Assumes that ifp is actually pointer to ethercom structure.
187 */
188static int
189ether_output(struct ifnet * const ifp0, struct mbuf * const m0,
190 const struct sockaddr * const dst,
191 const struct rtentry *rt)
192{
193 uint16_t etype = 0;
194 int error = 0, hdrcmplt = 0;
195 uint8_t esrc[6], edst[6];
196 struct mbuf *m = m0;
197 struct mbuf *mcopy = NULL;
198 struct ether_header *eh;
199 struct ifnet *ifp = ifp0;
200#ifdef INET
201 struct arphdr *ah;
202#endif /* INET */
203#ifdef NETATALK
204 struct at_ifaddr *aa;
205#endif /* NETATALK */
206
207 /*
208 * some paths such as carp_output() call ethr_output() with "ifp"
209 * argument as other than ether ifnet.
210 */
211 KASSERT(ifp->if_output != ether_output
212 || ifp->if_extflags & IFEF_OUTPUT_MPSAFE);
213
214#ifdef MBUFTRACE
215 m_claimm(m, ifp->if_mowner);
216#endif
217
218#if NCARP > 0
219 if (ifp->if_type == IFT_CARP) {
220 struct ifaddr *ifa;
221 int s = pserialize_read_enter();
222
223 /* loop back if this is going to the carp interface */
224 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP &&
225 (ifa = ifa_ifwithaddr(dst)) != NULL) {
226 if (ifa->ifa_ifp == ifp0) {
227 pserialize_read_exit(s);
228 return looutput(ifp0, m, dst, rt);
229 }
230 }
231 pserialize_read_exit(s);
232
233 ifp = ifp->if_carpdev;
234 /* ac = (struct arpcom *)ifp; */
235
236 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
237 (IFF_UP|IFF_RUNNING))
238 senderr(ENETDOWN);
239 }
240#endif /* NCARP > 0 */
241
242 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
243 senderr(ENETDOWN);
244
245 switch (dst->sa_family) {
246
247#ifdef INET
248 case AF_INET:
249#ifndef NET_MPSAFE
250 KERNEL_LOCK(1, NULL);
251#endif
252 if (m->m_flags & M_BCAST)
253 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
254 else if (m->m_flags & M_MCAST)
255 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst);
256 else if ((error = arpresolve(ifp, rt, m, dst, edst,
257 sizeof(edst))) != 0) {
258#ifndef NET_MPSAFE
259 KERNEL_UNLOCK_ONE(NULL);
260#endif
261 return error == EWOULDBLOCK ? 0 : error;
262 }
263#ifndef NET_MPSAFE
264 KERNEL_UNLOCK_ONE(NULL);
265#endif
266 /* If broadcasting on a simplex interface, loopback a copy */
267 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
268 mcopy = m_copy(m, 0, (int)M_COPYALL);
269 etype = htons(ETHERTYPE_IP);
270 break;
271
272 case AF_ARP:
273 ah = mtod(m, struct arphdr *);
274 if (m->m_flags & M_BCAST)
275 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
276 else {
277 void *tha = ar_tha(ah);
278
279 if (tha == NULL) {
280 /* fake with ARPHDR_IEEE1394 */
281 return 0;
282 }
283 memcpy(edst, tha, sizeof(edst));
284 }
285
286 ah->ar_hrd = htons(ARPHRD_ETHER);
287
288 switch (ntohs(ah->ar_op)) {
289 case ARPOP_REVREQUEST:
290 case ARPOP_REVREPLY:
291 etype = htons(ETHERTYPE_REVARP);
292 break;
293
294 case ARPOP_REQUEST:
295 case ARPOP_REPLY:
296 default:
297 etype = htons(ETHERTYPE_ARP);
298 }
299
300 break;
301#endif
302#ifdef INET6
303 case AF_INET6:
304 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){
305 /* something bad happened */
306 return (0);
307 }
308 etype = htons(ETHERTYPE_IPV6);
309 break;
310#endif
311#ifdef NETATALK
312 case AF_APPLETALK: {
313 struct ifaddr *ifa;
314 int s;
315
316 KERNEL_LOCK(1, NULL);
317 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
318#ifdef NETATALKDEBUG
319 printf("aarpresolv failed\n");
320#endif /* NETATALKDEBUG */
321 KERNEL_UNLOCK_ONE(NULL);
322 return (0);
323 }
324 /*
325 * ifaddr is the first thing in at_ifaddr
326 */
327 s = pserialize_read_enter();
328 ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp);
329 if (ifa == NULL) {
330 pserialize_read_exit(s);
331 KERNEL_UNLOCK_ONE(NULL);
332 goto bad;
333 }
334 aa = (struct at_ifaddr *)ifa;
335
336 /*
337 * In the phase 2 case, we need to prepend an mbuf for the
338 * llc header. Since we must preserve the value of m,
339 * which is passed to us by value, we m_copy() the first
340 * mbuf, and use it for our llc header.
341 */
342 if (aa->aa_flags & AFA_PHASE2) {
343 struct llc llc;
344
345 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT);
346 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
347 llc.llc_control = LLC_UI;
348 memcpy(llc.llc_snap_org_code, at_org_code,
349 sizeof(llc.llc_snap_org_code));
350 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
351 memcpy(mtod(m, void *), &llc, sizeof(struct llc));
352 } else {
353 etype = htons(ETHERTYPE_ATALK);
354 }
355 pserialize_read_exit(s);
356 KERNEL_UNLOCK_ONE(NULL);
357 break;
358 }
359#endif /* NETATALK */
360 case pseudo_AF_HDRCMPLT:
361 hdrcmplt = 1;
362 memcpy(esrc,
363 ((const struct ether_header *)dst->sa_data)->ether_shost,
364 sizeof(esrc));
365 /* FALLTHROUGH */
366
367 case AF_UNSPEC:
368 memcpy(edst,
369 ((const struct ether_header *)dst->sa_data)->ether_dhost,
370 sizeof(edst));
371 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */
372 etype = ((const struct ether_header *)dst->sa_data)->ether_type;
373 break;
374
375 default:
376 printf("%s: can't handle af%d\n", ifp->if_xname,
377 dst->sa_family);
378 senderr(EAFNOSUPPORT);
379 }
380
381#ifdef MPLS
382 KERNEL_LOCK(1, NULL);
383 {
384 struct m_tag *mtag;
385 mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL);
386 if (mtag != NULL) {
387 /* Having the tag itself indicates it's MPLS */
388 etype = htons(ETHERTYPE_MPLS);
389 m_tag_delete(m, mtag);
390 }
391 }
392 KERNEL_UNLOCK_ONE(NULL);
393#endif
394
395 if (mcopy)
396 (void)looutput(ifp, mcopy, dst, rt);
397
398 /* If no ether type is set, this must be a 802.2 formatted packet.
399 */
400 if (etype == 0)
401 etype = htons(m->m_pkthdr.len);
402 /*
403 * Add local net header. If no space in first mbuf,
404 * allocate another.
405 */
406 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
407 if (m == 0)
408 senderr(ENOBUFS);
409 eh = mtod(m, struct ether_header *);
410 /* Note: etype is already in network byte order. */
411 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
412 memcpy(eh->ether_dhost, edst, sizeof(edst));
413 if (hdrcmplt)
414 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost));
415 else
416 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl),
417 sizeof(eh->ether_shost));
418
419#if NCARP > 0
420 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
421 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl),
422 sizeof(eh->ether_shost));
423 }
424#endif /* NCARP > 0 */
425
426 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
427 return (error);
428 if (m == NULL)
429 return (0);
430
431#if NBRIDGE > 0
432 /*
433 * Bridges require special output handling.
434 */
435 if (ifp->if_bridge)
436 return (bridge_output(ifp, m, NULL, NULL));
437#endif
438
439#if NCARP > 0
440 if (ifp != ifp0)
441 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN;
442#endif /* NCARP > 0 */
443
444#ifdef ALTQ
445 KERNEL_LOCK(1, NULL);
446 /*
447 * If ALTQ is enabled on the parent interface, do
448 * classification; the queueing discipline might not
449 * require classification, but might require the
450 * address family/header pointer in the pktattr.
451 */
452 if (ALTQ_IS_ENABLED(&ifp->if_snd))
453 altq_etherclassify(&ifp->if_snd, m);
454 KERNEL_UNLOCK_ONE(NULL);
455#endif
456 return ifq_enqueue(ifp, m);
457
458bad:
459 if (m)
460 m_freem(m);
461 return (error);
462}
463
464#ifdef ALTQ
465/*
466 * This routine is a slight hack to allow a packet to be classified
467 * if the Ethernet headers are present. It will go away when ALTQ's
468 * classification engine understands link headers.
469 */
470void
471altq_etherclassify(struct ifaltq *ifq, struct mbuf *m)
472{
473 struct ether_header *eh;
474 uint16_t ether_type;
475 int hlen, af, hdrsize;
476 void *hdr;
477
478 hlen = ETHER_HDR_LEN;
479 eh = mtod(m, struct ether_header *);
480
481 ether_type = htons(eh->ether_type);
482
483 if (ether_type < ETHERMTU) {
484 /* LLC/SNAP */
485 struct llc *llc = (struct llc *)(eh + 1);
486 hlen += 8;
487
488 if (m->m_len < hlen ||
489 llc->llc_dsap != LLC_SNAP_LSAP ||
490 llc->llc_ssap != LLC_SNAP_LSAP ||
491 llc->llc_control != LLC_UI) {
492 /* Not SNAP. */
493 goto bad;
494 }
495
496 ether_type = htons(llc->llc_un.type_snap.ether_type);
497 }
498
499 switch (ether_type) {
500 case ETHERTYPE_IP:
501 af = AF_INET;
502 hdrsize = 20; /* sizeof(struct ip) */
503 break;
504
505 case ETHERTYPE_IPV6:
506 af = AF_INET6;
507 hdrsize = 40; /* sizeof(struct ip6_hdr) */
508 break;
509
510 default:
511 af = AF_UNSPEC;
512 hdrsize = 0;
513 break;
514 }
515
516 while (m->m_len <= hlen) {
517 hlen -= m->m_len;
518 m = m->m_next;
519 }
520 if (m->m_len < (hlen + hdrsize)) {
521 /*
522 * protocol header not in a single mbuf.
523 * We can't cope with this situation right
524 * now (but it shouldn't ever happen, really, anyhow).
525 */
526#ifdef DEBUG
527 printf("altq_etherclassify: headers span multiple mbufs: "
528 "%d < %d\n", m->m_len, (hlen + hdrsize));
529#endif
530 goto bad;
531 }
532
533 m->m_data += hlen;
534 m->m_len -= hlen;
535
536 hdr = mtod(m, void *);
537
538 if (ALTQ_NEEDS_CLASSIFY(ifq))
539 m->m_pkthdr.pattr_class =
540 (*ifq->altq_classify)(ifq->altq_clfier, m, af);
541 m->m_pkthdr.pattr_af = af;
542 m->m_pkthdr.pattr_hdr = hdr;
543
544 m->m_data -= hlen;
545 m->m_len += hlen;
546
547 return;
548
549 bad:
550 m->m_pkthdr.pattr_class = NULL;
551 m->m_pkthdr.pattr_hdr = NULL;
552 m->m_pkthdr.pattr_af = AF_UNSPEC;
553}
554#endif /* ALTQ */
555
556/*
557 * Process a received Ethernet packet;
558 * the packet is in the mbuf chain m with
559 * the ether header.
560 */
561void
562ether_input(struct ifnet *ifp, struct mbuf *m)
563{
564 struct ethercom *ec = (struct ethercom *) ifp;
565 pktqueue_t *pktq = NULL;
566 struct ifqueue *inq = NULL;
567 uint16_t etype;
568 struct ether_header *eh;
569 size_t ehlen;
570 static int earlypkts;
571 int isr = 0;
572#if defined (LLC) || defined(NETATALK)
573 struct llc *l;
574#endif
575
576 KASSERT(!cpu_intr_p());
577
578 if ((ifp->if_flags & IFF_UP) == 0) {
579 m_freem(m);
580 return;
581 }
582
583#ifdef MBUFTRACE
584 m_claimm(m, &ec->ec_rx_mowner);
585#endif
586 eh = mtod(m, struct ether_header *);
587 etype = ntohs(eh->ether_type);
588 ehlen = sizeof(*eh);
589
590 if(__predict_false(earlypkts < 100 || !rnd_initial_entropy)) {
591 rnd_add_data(NULL, eh, ehlen, 0);
592 earlypkts++;
593 }
594
595 /*
596 * Determine if the packet is within its size limits.
597 */
598 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len >
599 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
600 mutex_enter(&bigpktpps_lock);
601 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count,
602 bigpktppslim)) {
603 printf("%s: discarding oversize frame (len=%d)\n",
604 ifp->if_xname, m->m_pkthdr.len);
605 }
606 mutex_exit(&bigpktpps_lock);
607 m_freem(m);
608 return;
609 }
610
611 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
612 /*
613 * If this is not a simplex interface, drop the packet
614 * if it came from us.
615 */
616 if ((ifp->if_flags & IFF_SIMPLEX) == 0 &&
617 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost,
618 ETHER_ADDR_LEN) == 0) {
619 m_freem(m);
620 return;
621 }
622
623 if (memcmp(etherbroadcastaddr,
624 eh->ether_dhost, ETHER_ADDR_LEN) == 0)
625 m->m_flags |= M_BCAST;
626 else
627 m->m_flags |= M_MCAST;
628 ifp->if_imcasts++;
629 }
630
631 /* If the CRC is still on the packet, trim it off. */
632 if (m->m_flags & M_HASFCS) {
633 m_adj(m, -ETHER_CRC_LEN);
634 m->m_flags &= ~M_HASFCS;
635 }
636
637 ifp->if_ibytes += m->m_pkthdr.len;
638
639#if NCARP > 0
640 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) {
641 /*
642 * clear M_PROMISC, in case the packets comes from a
643 * vlan
644 */
645 m->m_flags &= ~M_PROMISC;
646 if (carp_input(m, (uint8_t *)&eh->ether_shost,
647 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0)
648 return;
649 }
650#endif /* NCARP > 0 */
651 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 &&
652 (ifp->if_flags & IFF_PROMISC) != 0 &&
653 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost,
654 ETHER_ADDR_LEN) != 0) {
655 m->m_flags |= M_PROMISC;
656 }
657
658 if ((m->m_flags & M_PROMISC) == 0) {
659 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
660 return;
661 if (m == NULL)
662 return;
663
664 eh = mtod(m, struct ether_header *);
665 etype = ntohs(eh->ether_type);
666 ehlen = sizeof(*eh);
667 }
668
669#if NAGR > 0
670 if (ifp->if_agrprivate &&
671 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
672 m->m_flags &= ~M_PROMISC;
673 agr_input(ifp, m);
674 return;
675 }
676#endif /* NAGR > 0 */
677
678 /*
679 * If VLANs are configured on the interface, check to
680 * see if the device performed the decapsulation and
681 * provided us with the tag.
682 */
683 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
684#if NVLAN > 0
685 /*
686 * vlan_input() will either recursively call ether_input()
687 * or drop the packet.
688 */
689 vlan_input(ifp, m);
690#else
691 m_freem(m);
692#endif
693 return;
694 }
695
696 /*
697 * Handle protocols that expect to have the Ethernet header
698 * (and possibly FCS) intact.
699 */
700 switch (etype) {
701 case ETHERTYPE_VLAN: {
702 struct ether_vlan_header *evl = (void *)eh;
703 /*
704 * If there is a tag of 0, then the VLAN header was probably
705 * just being used to store the priority. Extract the ether
706 * type, and if IP or IPV6, let them deal with it.
707 */
708 if (m->m_len <= sizeof(*evl)
709 && EVL_VLANOFTAG(evl->evl_tag) == 0) {
710 etype = ntohs(evl->evl_proto);
711 ehlen = sizeof(*evl);
712 if ((m->m_flags & M_PROMISC) == 0
713 && (etype == ETHERTYPE_IP
714 || etype == ETHERTYPE_IPV6))
715 break;
716 }
717#if NVLAN > 0
718 /*
719 * vlan_input() will either recursively call ether_input()
720 * or drop the packet.
721 */
722 if (((struct ethercom *)ifp)->ec_nvlans != 0)
723 vlan_input(ifp, m);
724 else
725#endif /* NVLAN > 0 */
726 m_freem(m);
727 return;
728 }
729#if NPPPOE > 0
730 case ETHERTYPE_PPPOEDISC:
731 pppoedisc_input(ifp, m);
732 return;
733 case ETHERTYPE_PPPOE:
734 pppoe_input(ifp, m);
735 return;
736#endif /* NPPPOE > 0 */
737 case ETHERTYPE_SLOWPROTOCOLS: {
738 uint8_t subtype;
739
740#if defined(DIAGNOSTIC)
741 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
742 panic("ether_input: too short slow protocol packet");
743 }
744#endif
745 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
746 switch (subtype) {
747#if NAGR > 0
748 case SLOWPROTOCOLS_SUBTYPE_LACP:
749 if (ifp->if_agrprivate) {
750 ieee8023ad_lacp_input(ifp, m);
751 return;
752 }
753 break;
754
755 case SLOWPROTOCOLS_SUBTYPE_MARKER:
756 if (ifp->if_agrprivate) {
757 ieee8023ad_marker_input(ifp, m);
758 return;
759 }
760 break;
761#endif /* NAGR > 0 */
762 default:
763 if (subtype == 0 || subtype > 10) {
764 /* illegal value */
765 m_freem(m);
766 return;
767 }
768 /* unknown subtype */
769 break;
770 }
771 /* FALLTHROUGH */
772 }
773 default:
774 if (m->m_flags & M_PROMISC) {
775 m_freem(m);
776 return;
777 }
778 }
779
780 /* If the CRC is still on the packet, trim it off. */
781 if (m->m_flags & M_HASFCS) {
782 m_adj(m, -ETHER_CRC_LEN);
783 m->m_flags &= ~M_HASFCS;
784 }
785
786 if (etype > ETHERMTU + sizeof (struct ether_header)) {
787 /* Strip off the Ethernet header. */
788 m_adj(m, ehlen);
789
790 switch (etype) {
791#ifdef INET
792 case ETHERTYPE_IP:
793#ifdef GATEWAY
794 if (ipflow_fastforward(m))
795 return;
796#endif
797 pktq = ip_pktq;
798 break;
799
800 case ETHERTYPE_ARP:
801 isr = NETISR_ARP;
802 inq = &arpintrq;
803 break;
804
805 case ETHERTYPE_REVARP:
806 revarpinput(m); /* XXX queue? */
807 return;
808#endif
809#ifdef INET6
810 case ETHERTYPE_IPV6:
811 if (__predict_false(!in6_present)) {
812 m_freem(m);
813 return;
814 }
815#ifdef GATEWAY
816 if (ip6flow_fastforward(&m))
817 return;
818#endif
819 pktq = ip6_pktq;
820 break;
821#endif
822#ifdef NETATALK
823 case ETHERTYPE_ATALK:
824 isr = NETISR_ATALK;
825 inq = &atintrq1;
826 break;
827 case ETHERTYPE_AARP:
828 /* probably this should be done with a NETISR as well */
829 aarpinput(ifp, m); /* XXX */
830 return;
831#endif /* NETATALK */
832#ifdef MPLS
833 case ETHERTYPE_MPLS:
834 isr = NETISR_MPLS;
835 inq = &mplsintrq;
836 break;
837#endif
838 default:
839 m_freem(m);
840 return;
841 }
842 } else {
843#if defined (LLC) || defined (NETATALK)
844 l = (struct llc *)(eh+1);
845 switch (l->llc_dsap) {
846#ifdef NETATALK
847 case LLC_SNAP_LSAP:
848 switch (l->llc_control) {
849 case LLC_UI:
850 if (l->llc_ssap != LLC_SNAP_LSAP) {
851 goto dropanyway;
852 }
853
854 if (memcmp(&(l->llc_snap_org_code)[0],
855 at_org_code, sizeof(at_org_code)) == 0 &&
856 ntohs(l->llc_snap_ether_type) ==
857 ETHERTYPE_ATALK) {
858 inq = &atintrq2;
859 m_adj(m, sizeof(struct ether_header)
860 + sizeof(struct llc));
861 isr = NETISR_ATALK;
862 break;
863 }
864
865 if (memcmp(&(l->llc_snap_org_code)[0],
866 aarp_org_code,
867 sizeof(aarp_org_code)) == 0 &&
868 ntohs(l->llc_snap_ether_type) ==
869 ETHERTYPE_AARP) {
870 m_adj( m, sizeof(struct ether_header)
871 + sizeof(struct llc));
872 aarpinput(ifp, m); /* XXX */
873 return;
874 }
875
876 default:
877 goto dropanyway;
878 }
879 break;
880 dropanyway:
881#endif
882 default:
883 m_freem(m);
884 return;
885 }
886#else /* ISO || LLC || NETATALK*/
887 m_freem(m);
888 return;
889#endif /* ISO || LLC || NETATALK*/
890 }
891
892 if (__predict_true(pktq)) {
893#ifdef NET_MPSAFE
894 const u_int h = curcpu()->ci_index;
895#else
896 const uint32_t h = pktq_rps_hash(m);
897#endif
898 if (__predict_false(!pktq_enqueue(pktq, m, h))) {
899 m_freem(m);
900 }
901 return;
902 }
903
904 if (__predict_false(!inq)) {
905 /* Should not happen. */
906 m_freem(m);
907 return;
908 }
909
910 IFQ_LOCK(inq);
911 if (IF_QFULL(inq)) {
912 IF_DROP(inq);
913 IFQ_UNLOCK(inq);
914 m_freem(m);
915 } else {
916 IF_ENQUEUE(inq, m);
917 IFQ_UNLOCK(inq);
918 schednetisr(isr);
919 }
920}
921
922/*
923 * Convert Ethernet address to printable (loggable) representation.
924 */
925char *
926ether_sprintf(const u_char *ap)
927{
928 static char etherbuf[3 * ETHER_ADDR_LEN];
929 return ether_snprintf(etherbuf, sizeof(etherbuf), ap);
930}
931
932char *
933ether_snprintf(char *buf, size_t len, const u_char *ap)
934{
935 char *cp = buf;
936 size_t i;
937
938 for (i = 0; i < len / 3; i++) {
939 *cp++ = hexdigits[*ap >> 4];
940 *cp++ = hexdigits[*ap++ & 0xf];
941 *cp++ = ':';
942 }
943 *--cp = '\0';
944 return buf;
945}
946
947/*
948 * Perform common duties while attaching to interface list
949 */
950void
951ether_ifattach(struct ifnet *ifp, const uint8_t *lla)
952{
953 struct ethercom *ec = (struct ethercom *)ifp;
954
955 ifp->if_extflags |= IFEF_OUTPUT_MPSAFE;
956 ifp->if_type = IFT_ETHER;
957 ifp->if_hdrlen = ETHER_HDR_LEN;
958 ifp->if_dlt = DLT_EN10MB;
959 ifp->if_mtu = ETHERMTU;
960 ifp->if_output = ether_output;
961 ifp->_if_input = ether_input;
962 if (ifp->if_baudrate == 0)
963 ifp->if_baudrate = IF_Mbps(10); /* just a default */
964
965 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla));
966
967 LIST_INIT(&ec->ec_multiaddrs);
968 ifp->if_broadcastaddr = etherbroadcastaddr;
969 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header));
970#ifdef MBUFTRACE
971 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname,
972 sizeof(ec->ec_tx_mowner.mo_name));
973 strlcpy(ec->ec_tx_mowner.mo_descr, "tx",
974 sizeof(ec->ec_tx_mowner.mo_descr));
975 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname,
976 sizeof(ec->ec_rx_mowner.mo_name));
977 strlcpy(ec->ec_rx_mowner.mo_descr, "rx",
978 sizeof(ec->ec_rx_mowner.mo_descr));
979 MOWNER_ATTACH(&ec->ec_tx_mowner);
980 MOWNER_ATTACH(&ec->ec_rx_mowner);
981 ifp->if_mowner = &ec->ec_tx_mowner;
982#endif
983}
984
985void
986ether_ifdetach(struct ifnet *ifp)
987{
988 struct ethercom *ec = (void *) ifp;
989 struct ether_multi *enm;
990 int s;
991
992 /*
993 * Prevent further calls to ioctl (for example turning off
994 * promiscuous mode from the bridge code), which eventually can
995 * call if_init() which can cause panics because the interface
996 * is in the process of being detached. Return device not configured
997 * instead.
998 */
999 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio;
1000
1001#if NBRIDGE > 0
1002 if (ifp->if_bridge)
1003 bridge_ifdetach(ifp);
1004#endif
1005
1006 bpf_detach(ifp);
1007
1008#if NVLAN > 0
1009 if (ec->ec_nvlans)
1010 vlan_ifdetach(ifp);
1011#endif
1012
1013 s = splnet();
1014 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
1015 LIST_REMOVE(enm, enm_list);
1016 free(enm, M_IFMADDR);
1017 ec->ec_multicnt--;
1018 }
1019 splx(s);
1020
1021 ifp->if_mowner = NULL;
1022 MOWNER_DETACH(&ec->ec_rx_mowner);
1023 MOWNER_DETACH(&ec->ec_tx_mowner);
1024}
1025
1026#if 0
1027/*
1028 * This is for reference. We have a table-driven version
1029 * of the little-endian crc32 generator, which is faster
1030 * than the double-loop.
1031 */
1032uint32_t
1033ether_crc32_le(const uint8_t *buf, size_t len)
1034{
1035 uint32_t c, crc, carry;
1036 size_t i, j;
1037
1038 crc = 0xffffffffU; /* initial value */
1039
1040 for (i = 0; i < len; i++) {
1041 c = buf[i];
1042 for (j = 0; j < 8; j++) {
1043 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1044 crc >>= 1;
1045 c >>= 1;
1046 if (carry)
1047 crc = (crc ^ ETHER_CRC_POLY_LE);
1048 }
1049 }
1050
1051 return (crc);
1052}
1053#else
1054uint32_t
1055ether_crc32_le(const uint8_t *buf, size_t len)
1056{
1057 static const uint32_t crctab[] = {
1058 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1059 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1060 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1061 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1062 };
1063 uint32_t crc;
1064 size_t i;
1065
1066 crc = 0xffffffffU; /* initial value */
1067
1068 for (i = 0; i < len; i++) {
1069 crc ^= buf[i];
1070 crc = (crc >> 4) ^ crctab[crc & 0xf];
1071 crc = (crc >> 4) ^ crctab[crc & 0xf];
1072 }
1073
1074 return (crc);
1075}
1076#endif
1077
1078uint32_t
1079ether_crc32_be(const uint8_t *buf, size_t len)
1080{
1081 uint32_t c, crc, carry;
1082 size_t i, j;
1083
1084 crc = 0xffffffffU; /* initial value */
1085
1086 for (i = 0; i < len; i++) {
1087 c = buf[i];
1088 for (j = 0; j < 8; j++) {
1089 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1090 crc <<= 1;
1091 c >>= 1;
1092 if (carry)
1093 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1094 }
1095 }
1096
1097 return (crc);
1098}
1099
1100#ifdef INET
1101const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] =
1102 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
1103const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] =
1104 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
1105#endif
1106#ifdef INET6
1107const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] =
1108 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
1109const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] =
1110 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
1111#endif
1112
1113/*
1114 * ether_aton implementation, not using a static buffer.
1115 */
1116int
1117ether_aton_r(u_char *dest, size_t len, const char *str)
1118{
1119 const u_char *cp = (const void *)str;
1120 u_char *ep;
1121
1122#define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10))
1123
1124 if (len < ETHER_ADDR_LEN)
1125 return ENOSPC;
1126
1127 ep = dest + ETHER_ADDR_LEN;
1128
1129 while (*cp) {
1130 if (!isxdigit(*cp))
1131 return EINVAL;
1132 *dest = atox(*cp);
1133 cp++;
1134 if (isxdigit(*cp)) {
1135 *dest = (*dest << 4) | atox(*cp);
1136 dest++;
1137 cp++;
1138 } else
1139 dest++;
1140 if (dest == ep)
1141 return *cp == '\0' ? 0 : ENAMETOOLONG;
1142 switch (*cp) {
1143 case ':':
1144 case '-':
1145 case '.':
1146 cp++;
1147 break;
1148 }
1149 }
1150 return ENOBUFS;
1151}
1152
1153/*
1154 * Convert a sockaddr into an Ethernet address or range of Ethernet
1155 * addresses.
1156 */
1157int
1158ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN],
1159 uint8_t addrhi[ETHER_ADDR_LEN])
1160{
1161#ifdef INET
1162 const struct sockaddr_in *sin;
1163#endif /* INET */
1164#ifdef INET6
1165 const struct sockaddr_in6 *sin6;
1166#endif /* INET6 */
1167
1168 switch (sa->sa_family) {
1169
1170 case AF_UNSPEC:
1171 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN);
1172 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1173 break;
1174
1175#ifdef INET
1176 case AF_INET:
1177 sin = satocsin(sa);
1178 if (sin->sin_addr.s_addr == INADDR_ANY) {
1179 /*
1180 * An IP address of INADDR_ANY means listen to
1181 * or stop listening to all of the Ethernet
1182 * multicast addresses used for IP.
1183 * (This is for the sake of IP multicast routers.)
1184 */
1185 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN);
1186 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN);
1187 }
1188 else {
1189 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
1190 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1191 }
1192 break;
1193#endif
1194#ifdef INET6
1195 case AF_INET6:
1196 sin6 = satocsin6(sa);
1197 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1198 /*
1199 * An IP6 address of 0 means listen to or stop
1200 * listening to all of the Ethernet multicast
1201 * address used for IP6.
1202 * (This is used for multicast routers.)
1203 */
1204 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN);
1205 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN);
1206 } else {
1207 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
1208 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1209 }
1210 break;
1211#endif
1212
1213 default:
1214 return EAFNOSUPPORT;
1215 }
1216 return 0;
1217}
1218
1219/*
1220 * Add an Ethernet multicast address or range of addresses to the list for a
1221 * given interface.
1222 */
1223int
1224ether_addmulti(const struct sockaddr *sa, struct ethercom *ec)
1225{
1226 struct ether_multi *enm;
1227 u_char addrlo[ETHER_ADDR_LEN];
1228 u_char addrhi[ETHER_ADDR_LEN];
1229 int s = splnet(), error;
1230
1231 error = ether_multiaddr(sa, addrlo, addrhi);
1232 if (error != 0) {
1233 splx(s);
1234 return error;
1235 }
1236
1237 /*
1238 * Verify that we have valid Ethernet multicast addresses.
1239 */
1240 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) {
1241 splx(s);
1242 return EINVAL;
1243 }
1244 /*
1245 * See if the address range is already in the list.
1246 */
1247 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1248 if (enm != NULL) {
1249 /*
1250 * Found it; just increment the reference count.
1251 */
1252 ++enm->enm_refcount;
1253 splx(s);
1254 return 0;
1255 }
1256 /*
1257 * New address or range; malloc a new multicast record
1258 * and link it into the interface's multicast list.
1259 */
1260 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
1261 if (enm == NULL) {
1262 splx(s);
1263 return ENOBUFS;
1264 }
1265 memcpy(enm->enm_addrlo, addrlo, 6);
1266 memcpy(enm->enm_addrhi, addrhi, 6);
1267 enm->enm_refcount = 1;
1268 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
1269 ec->ec_multicnt++;
1270 splx(s);
1271 /*
1272 * Return ENETRESET to inform the driver that the list has changed
1273 * and its reception filter should be adjusted accordingly.
1274 */
1275 return ENETRESET;
1276}
1277
1278/*
1279 * Delete a multicast address record.
1280 */
1281int
1282ether_delmulti(const struct sockaddr *sa, struct ethercom *ec)
1283{
1284 struct ether_multi *enm;
1285 u_char addrlo[ETHER_ADDR_LEN];
1286 u_char addrhi[ETHER_ADDR_LEN];
1287 int s = splnet(), error;
1288
1289 error = ether_multiaddr(sa, addrlo, addrhi);
1290 if (error != 0) {
1291 splx(s);
1292 return (error);
1293 }
1294
1295 /*
1296 * Look ur the address in our list.
1297 */
1298 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1299 if (enm == NULL) {
1300 splx(s);
1301 return (ENXIO);
1302 }
1303 if (--enm->enm_refcount != 0) {
1304 /*
1305 * Still some claims to this record.
1306 */
1307 splx(s);
1308 return (0);
1309 }
1310 /*
1311 * No remaining claims to this record; unlink and free it.
1312 */
1313 LIST_REMOVE(enm, enm_list);
1314 free(enm, M_IFMADDR);
1315 ec->ec_multicnt--;
1316 splx(s);
1317 /*
1318 * Return ENETRESET to inform the driver that the list has changed
1319 * and its reception filter should be adjusted accordingly.
1320 */
1321 return (ENETRESET);
1322}
1323
1324void
1325ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb)
1326{
1327 ec->ec_ifflags_cb = cb;
1328}
1329
1330/*
1331 * Common ioctls for Ethernet interfaces. Note, we must be
1332 * called at splnet().
1333 */
1334int
1335ether_ioctl(struct ifnet *ifp, u_long cmd, void *data)
1336{
1337 struct ethercom *ec = (void *) ifp;
1338 struct eccapreq *eccr;
1339 struct ifreq *ifr = (struct ifreq *)data;
1340 struct if_laddrreq *iflr = data;
1341 const struct sockaddr_dl *sdl;
1342 static const uint8_t zero[ETHER_ADDR_LEN];
1343 int error;
1344
1345 switch (cmd) {
1346 case SIOCINITIFADDR:
1347 {
1348 struct ifaddr *ifa = (struct ifaddr *)data;
1349 if (ifa->ifa_addr->sa_family != AF_LINK
1350 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
1351 (IFF_UP|IFF_RUNNING)) {
1352 ifp->if_flags |= IFF_UP;
1353 if ((error = (*ifp->if_init)(ifp)) != 0)
1354 return error;
1355 }
1356#ifdef INET
1357 if (ifa->ifa_addr->sa_family == AF_INET)
1358 arp_ifinit(ifp, ifa);
1359#endif /* INET */
1360 return 0;
1361 }
1362
1363 case SIOCSIFMTU:
1364 {
1365 int maxmtu;
1366
1367 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
1368 maxmtu = ETHERMTU_JUMBO;
1369 else
1370 maxmtu = ETHERMTU;
1371
1372 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
1373 return EINVAL;
1374 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET)
1375 return error;
1376 else if (ifp->if_flags & IFF_UP) {
1377 /* Make sure the device notices the MTU change. */
1378 return (*ifp->if_init)(ifp);
1379 } else
1380 return 0;
1381 }
1382
1383 case SIOCSIFFLAGS:
1384 if ((error = ifioctl_common(ifp, cmd, data)) != 0)
1385 return error;
1386 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
1387 case IFF_RUNNING:
1388 /*
1389 * If interface is marked down and it is running,
1390 * then stop and disable it.
1391 */
1392 (*ifp->if_stop)(ifp, 1);
1393 break;
1394 case IFF_UP:
1395 /*
1396 * If interface is marked up and it is stopped, then
1397 * start it.
1398 */
1399 return (*ifp->if_init)(ifp);
1400 case IFF_UP|IFF_RUNNING:
1401 error = 0;
1402 if (ec->ec_ifflags_cb == NULL ||
1403 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) {
1404 /*
1405 * Reset the interface to pick up
1406 * changes in any other flags that
1407 * affect the hardware state.
1408 */
1409 return (*ifp->if_init)(ifp);
1410 } else
1411 return error;
1412 case 0:
1413 break;
1414 }
1415 return 0;
1416 case SIOCGETHERCAP:
1417 eccr = (struct eccapreq *)data;
1418 eccr->eccr_capabilities = ec->ec_capabilities;
1419 eccr->eccr_capenable = ec->ec_capenable;
1420 return 0;
1421 case SIOCADDMULTI:
1422 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec);
1423 case SIOCDELMULTI:
1424 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec);
1425 case SIOCSIFMEDIA:
1426 case SIOCGIFMEDIA:
1427 if (ec->ec_mii == NULL)
1428 return ENOTTY;
1429 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd);
1430 case SIOCALIFADDR:
1431 sdl = satocsdl(sstocsa(&iflr->addr));
1432 if (sdl->sdl_family != AF_LINK)
1433 ;
1434 else if (ETHER_IS_MULTICAST(CLLADDR(sdl)))
1435 return EINVAL;
1436 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0)
1437 return EINVAL;
1438 /*FALLTHROUGH*/
1439 default:
1440 return ifioctl_common(ifp, cmd, data);
1441 }
1442 return 0;
1443}
1444
1445/*
1446 * Enable/disable passing VLAN packets if the parent interface supports it.
1447 * Return:
1448 * 0: Ok
1449 * -1: Parent interface does not support vlans
1450 * >0: Error
1451 */
1452int
1453ether_enable_vlan_mtu(struct ifnet *ifp)
1454{
1455 int error;
1456 struct ethercom *ec = (void *)ifp;
1457
1458 /* Already have VLAN's do nothing. */
1459 if (ec->ec_nvlans != 0)
1460 return 0;
1461
1462 /* Parent does not support VLAN's */
1463 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0)
1464 return -1;
1465
1466 /*
1467 * Parent supports the VLAN_MTU capability,
1468 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames;
1469 * enable it.
1470 */
1471 ec->ec_capenable |= ETHERCAP_VLAN_MTU;
1472
1473 /* Interface is down, defer for later */
1474 if ((ifp->if_flags & IFF_UP) == 0)
1475 return 0;
1476
1477 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0)
1478 return 0;
1479
1480 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU;
1481 return error;
1482}
1483
1484int
1485ether_disable_vlan_mtu(struct ifnet *ifp)
1486{
1487 int error;
1488 struct ethercom *ec = (void *)ifp;
1489
1490 /* We still have VLAN's, defer for later */
1491 if (ec->ec_nvlans != 0)
1492 return 0;
1493
1494 /* Parent does not support VLAB's, nothing to do. */
1495 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0)
1496 return -1;
1497
1498 /*
1499 * Disable Tx/Rx of VLAN-sized frames.
1500 */
1501 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU;
1502
1503 /* Interface is down, defer for later */
1504 if ((ifp->if_flags & IFF_UP) == 0)
1505 return 0;
1506
1507 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0)
1508 return 0;
1509
1510 ec->ec_capenable |= ETHERCAP_VLAN_MTU;
1511 return error;
1512}
1513
1514static int
1515ether_multicast_sysctl(SYSCTLFN_ARGS)
1516{
1517 struct ether_multi *enm;
1518 struct ether_multi_sysctl addr;
1519 struct ifnet *ifp;
1520 struct ethercom *ec;
1521 int error = 0;
1522 size_t written;
1523 struct psref psref;
1524 int bound;
1525
1526 if (namelen != 1)
1527 return EINVAL;
1528
1529 bound = curlwp_bind();
1530 ifp = if_get_byindex(name[0], &psref);
1531 if (ifp == NULL) {
1532 error = ENODEV;
1533 goto out;
1534 }
1535 if (ifp->if_type != IFT_ETHER) {
1536 if_put(ifp, &psref);
1537 *oldlenp = 0;
1538 goto out;
1539 }
1540 ec = (struct ethercom *)ifp;
1541
1542 if (oldp == NULL) {
1543 if_put(ifp, &psref);
1544 *oldlenp = ec->ec_multicnt * sizeof(addr);
1545 goto out;
1546 }
1547
1548 memset(&addr, 0, sizeof(addr));
1549 error = 0;
1550 written = 0;
1551
1552 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) {
1553 if (written + sizeof(addr) > *oldlenp)
1554 break;
1555 addr.enm_refcount = enm->enm_refcount;
1556 memcpy(addr.enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN);
1557 memcpy(addr.enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN);
1558 error = sysctl_copyout(l, &addr, oldp, sizeof(addr));
1559 if (error)
1560 break;
1561 written += sizeof(addr);
1562 oldp = (char *)oldp + sizeof(addr);
1563 }
1564 if_put(ifp, &psref);
1565
1566 *oldlenp = written;
1567out:
1568 curlwp_bindx(bound);
1569 return error;
1570}
1571
1572SYSCTL_SETUP(sysctl_net_ether_setup, "sysctl net.ether subtree setup")
1573{
1574 const struct sysctlnode *rnode = NULL;
1575
1576 sysctl_createv(clog, 0, NULL, &rnode,
1577 CTLFLAG_PERMANENT,
1578 CTLTYPE_NODE, "ether",
1579 SYSCTL_DESCR("Ethernet-specific information"),
1580 NULL, 0, NULL, 0,
1581 CTL_NET, CTL_CREATE, CTL_EOL);
1582
1583 sysctl_createv(clog, 0, &rnode, NULL,
1584 CTLFLAG_PERMANENT,
1585 CTLTYPE_NODE, "multicast",
1586 SYSCTL_DESCR("multicast addresses"),
1587 ether_multicast_sysctl, 0, NULL, 0,
1588 CTL_CREATE, CTL_EOL);
1589}
1590
1591void
1592etherinit(void)
1593{
1594 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET);
1595}
1596