1 /* $NetBSD: if_ethersubr.c,v 1.226 2016/07/25 23:46:09 rjs 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 1.226 2016/07/25 23:46:09 rjs 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
159 extern u_char at_org_code[3];
160 extern 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
168 static struct timeval bigpktppslim_last;
169 static int bigpktppslim = 2; /* XXX */
170 static int bigpktpps_count;
171 static kmutex_t bigpktpps_lock __cacheline_aligned;
172
173
174 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] =
175 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
176 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
177 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
178 #define senderr(e) { error = (e); goto bad;}
179
180 static 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 */
188 static int
ether_output(struct ifnet * const ifp0,struct mbuf * const m0,const struct sockaddr * const dst,const struct rtentry * rt)189 ether_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
222 /* loop back if this is going to the carp interface */
223 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP &&
224 (ifa = ifa_ifwithaddr(dst)) != NULL &&
225 ifa->ifa_ifp == ifp0)
226 return looutput(ifp0, m, dst, rt);
227
228 ifp = ifp->if_carpdev;
229 /* ac = (struct arpcom *)ifp; */
230
231 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
232 (IFF_UP|IFF_RUNNING))
233 senderr(ENETDOWN);
234 }
235 #endif /* NCARP > 0 */
236
237 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
238 senderr(ENETDOWN);
239
240 switch (dst->sa_family) {
241
242 #ifdef INET
243 case AF_INET:
244 KERNEL_LOCK(1, NULL);
245 if (m->m_flags & M_BCAST)
246 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
247 else if (m->m_flags & M_MCAST)
248 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst);
249 else if ((error = arpresolve(ifp, rt, m, dst, edst,
250 sizeof(edst))) != 0) {
251 KERNEL_UNLOCK_ONE(NULL);
252 return error == EWOULDBLOCK ? 0 : error;
253 }
254 KERNEL_UNLOCK_ONE(NULL);
255 /* If broadcasting on a simplex interface, loopback a copy */
256 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
257 mcopy = m_copy(m, 0, (int)M_COPYALL);
258 etype = htons(ETHERTYPE_IP);
259 break;
260
261 case AF_ARP:
262 ah = mtod(m, struct arphdr *);
263 if (m->m_flags & M_BCAST)
264 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
265 else {
266 void *tha = ar_tha(ah);
267
268 if (tha == NULL) {
269 /* fake with ARPHDR_IEEE1394 */
270 return 0;
271 }
272 memcpy(edst, tha, sizeof(edst));
273 }
274
275 ah->ar_hrd = htons(ARPHRD_ETHER);
276
277 switch (ntohs(ah->ar_op)) {
278 case ARPOP_REVREQUEST:
279 case ARPOP_REVREPLY:
280 etype = htons(ETHERTYPE_REVARP);
281 break;
282
283 case ARPOP_REQUEST:
284 case ARPOP_REPLY:
285 default:
286 etype = htons(ETHERTYPE_ARP);
287 }
288
289 break;
290 #endif
291 #ifdef INET6
292 case AF_INET6:
293 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){
294 /* something bad happened */
295 return (0);
296 }
297 etype = htons(ETHERTYPE_IPV6);
298 break;
299 #endif
300 #ifdef NETATALK
301 case AF_APPLETALK:
302 KERNEL_LOCK(1, NULL);
303 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
304 #ifdef NETATALKDEBUG
305 printf("aarpresolv failed\n");
306 #endif /* NETATALKDEBUG */
307 KERNEL_UNLOCK_ONE(NULL);
308 return (0);
309 }
310 /*
311 * ifaddr is the first thing in at_ifaddr
312 */
313 aa = (struct at_ifaddr *) at_ifawithnet(
314 (const struct sockaddr_at *)dst, ifp);
315 if (aa == NULL) {
316 KERNEL_UNLOCK_ONE(NULL);
317 goto bad;
318 }
319
320 /*
321 * In the phase 2 case, we need to prepend an mbuf for the
322 * llc header. Since we must preserve the value of m,
323 * which is passed to us by value, we m_copy() the first
324 * mbuf, and use it for our llc header.
325 */
326 if (aa->aa_flags & AFA_PHASE2) {
327 struct llc llc;
328
329 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT);
330 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
331 llc.llc_control = LLC_UI;
332 memcpy(llc.llc_snap_org_code, at_org_code,
333 sizeof(llc.llc_snap_org_code));
334 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
335 memcpy(mtod(m, void *), &llc, sizeof(struct llc));
336 } else {
337 etype = htons(ETHERTYPE_ATALK);
338 }
339 KERNEL_UNLOCK_ONE(NULL);
340 break;
341 #endif /* NETATALK */
342 case pseudo_AF_HDRCMPLT:
343 hdrcmplt = 1;
344 memcpy(esrc,
345 ((const struct ether_header *)dst->sa_data)->ether_shost,
346 sizeof(esrc));
347 /* FALLTHROUGH */
348
349 case AF_UNSPEC:
350 memcpy(edst,
351 ((const struct ether_header *)dst->sa_data)->ether_dhost,
352 sizeof(edst));
353 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */
354 etype = ((const struct ether_header *)dst->sa_data)->ether_type;
355 break;
356
357 default:
358 printf("%s: can't handle af%d\n", ifp->if_xname,
359 dst->sa_family);
360 senderr(EAFNOSUPPORT);
361 }
362
363 #ifdef MPLS
364 KERNEL_LOCK(1, NULL);
365 {
366 struct m_tag *mtag;
367 mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL);
368 if (mtag != NULL) {
369 /* Having the tag itself indicates it's MPLS */
370 etype = htons(ETHERTYPE_MPLS);
371 m_tag_delete(m, mtag);
372 }
373 }
374 KERNEL_UNLOCK_ONE(NULL);
375 #endif
376
377 if (mcopy)
378 (void)looutput(ifp, mcopy, dst, rt);
379
380 /* If no ether type is set, this must be a 802.2 formatted packet.
381 */
382 if (etype == 0)
383 etype = htons(m->m_pkthdr.len);
384 /*
385 * Add local net header. If no space in first mbuf,
386 * allocate another.
387 */
388 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
389 if (m == 0)
390 senderr(ENOBUFS);
391 eh = mtod(m, struct ether_header *);
392 /* Note: etype is already in network byte order. */
393 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
394 memcpy(eh->ether_dhost, edst, sizeof(edst));
395 if (hdrcmplt)
396 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost));
397 else
398 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl),
399 sizeof(eh->ether_shost));
400
401 #if NCARP > 0
402 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
403 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl),
404 sizeof(eh->ether_shost));
405 }
406 #endif /* NCARP > 0 */
407
408 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
409 return (error);
410 if (m == NULL)
411 return (0);
412
413 #if NBRIDGE > 0
414 /*
415 * Bridges require special output handling.
416 */
417 if (ifp->if_bridge)
418 return (bridge_output(ifp, m, NULL, NULL));
419 #endif
420
421 #if NCARP > 0
422 if (ifp != ifp0)
423 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN;
424 #endif /* NCARP > 0 */
425
426 #ifdef ALTQ
427 KERNEL_LOCK(1, NULL);
428 /*
429 * If ALTQ is enabled on the parent interface, do
430 * classification; the queueing discipline might not
431 * require classification, but might require the
432 * address family/header pointer in the pktattr.
433 */
434 if (ALTQ_IS_ENABLED(&ifp->if_snd))
435 altq_etherclassify(&ifp->if_snd, m);
436 KERNEL_UNLOCK_ONE(NULL);
437 #endif
438 return ifq_enqueue(ifp, m);
439
440 bad:
441 if (m)
442 m_freem(m);
443 return (error);
444 }
445
446 #ifdef ALTQ
447 /*
448 * This routine is a slight hack to allow a packet to be classified
449 * if the Ethernet headers are present. It will go away when ALTQ's
450 * classification engine understands link headers.
451 */
452 void
altq_etherclassify(struct ifaltq * ifq,struct mbuf * m)453 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m)
454 {
455 struct ether_header *eh;
456 uint16_t ether_type;
457 int hlen, af, hdrsize;
458 void *hdr;
459
460 hlen = ETHER_HDR_LEN;
461 eh = mtod(m, struct ether_header *);
462
463 ether_type = htons(eh->ether_type);
464
465 if (ether_type < ETHERMTU) {
466 /* LLC/SNAP */
467 struct llc *llc = (struct llc *)(eh + 1);
468 hlen += 8;
469
470 if (m->m_len < hlen ||
471 llc->llc_dsap != LLC_SNAP_LSAP ||
472 llc->llc_ssap != LLC_SNAP_LSAP ||
473 llc->llc_control != LLC_UI) {
474 /* Not SNAP. */
475 goto bad;
476 }
477
478 ether_type = htons(llc->llc_un.type_snap.ether_type);
479 }
480
481 switch (ether_type) {
482 case ETHERTYPE_IP:
483 af = AF_INET;
484 hdrsize = 20; /* sizeof(struct ip) */
485 break;
486
487 case ETHERTYPE_IPV6:
488 af = AF_INET6;
489 hdrsize = 40; /* sizeof(struct ip6_hdr) */
490 break;
491
492 default:
493 af = AF_UNSPEC;
494 hdrsize = 0;
495 break;
496 }
497
498 while (m->m_len <= hlen) {
499 hlen -= m->m_len;
500 m = m->m_next;
501 }
502 if (m->m_len < (hlen + hdrsize)) {
503 /*
504 * protocol header not in a single mbuf.
505 * We can't cope with this situation right
506 * now (but it shouldn't ever happen, really, anyhow).
507 */
508 #ifdef DEBUG
509 printf("altq_etherclassify: headers span multiple mbufs: "
510 "%d < %d\n", m->m_len, (hlen + hdrsize));
511 #endif
512 goto bad;
513 }
514
515 m->m_data += hlen;
516 m->m_len -= hlen;
517
518 hdr = mtod(m, void *);
519
520 if (ALTQ_NEEDS_CLASSIFY(ifq))
521 m->m_pkthdr.pattr_class =
522 (*ifq->altq_classify)(ifq->altq_clfier, m, af);
523 m->m_pkthdr.pattr_af = af;
524 m->m_pkthdr.pattr_hdr = hdr;
525
526 m->m_data -= hlen;
527 m->m_len += hlen;
528
529 return;
530
531 bad:
532 m->m_pkthdr.pattr_class = NULL;
533 m->m_pkthdr.pattr_hdr = NULL;
534 m->m_pkthdr.pattr_af = AF_UNSPEC;
535 }
536 #endif /* ALTQ */
537
538 /*
539 * Process a received Ethernet packet;
540 * the packet is in the mbuf chain m with
541 * the ether header.
542 */
543 void
ether_input(struct ifnet * ifp,struct mbuf * m)544 ether_input(struct ifnet *ifp, struct mbuf *m)
545 {
546 struct ethercom *ec = (struct ethercom *) ifp;
547 pktqueue_t *pktq = NULL;
548 struct ifqueue *inq = NULL;
549 uint16_t etype;
550 struct ether_header *eh;
551 size_t ehlen;
552 static int earlypkts;
553 int isr = 0;
554 #if defined (LLC) || defined(NETATALK)
555 struct llc *l;
556 #endif
557
558 KASSERT(!cpu_intr_p());
559
560 if ((ifp->if_flags & IFF_UP) == 0) {
561 m_freem(m);
562 return;
563 }
564
565 #ifdef MBUFTRACE
566 m_claimm(m, &ec->ec_rx_mowner);
567 #endif
568 eh = mtod(m, struct ether_header *);
569 etype = ntohs(eh->ether_type);
570 ehlen = sizeof(*eh);
571
572 if(__predict_false(earlypkts < 100 || !rnd_initial_entropy)) {
573 rnd_add_data(NULL, eh, ehlen, 0);
574 earlypkts++;
575 }
576
577 /*
578 * Determine if the packet is within its size limits.
579 */
580 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len >
581 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
582 mutex_enter(&bigpktpps_lock);
583 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count,
584 bigpktppslim)) {
585 printf("%s: discarding oversize frame (len=%d)\n",
586 ifp->if_xname, m->m_pkthdr.len);
587 }
588 mutex_exit(&bigpktpps_lock);
589 m_freem(m);
590 return;
591 }
592
593 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
594 /*
595 * If this is not a simplex interface, drop the packet
596 * if it came from us.
597 */
598 if ((ifp->if_flags & IFF_SIMPLEX) == 0 &&
599 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost,
600 ETHER_ADDR_LEN) == 0) {
601 m_freem(m);
602 return;
603 }
604
605 if (memcmp(etherbroadcastaddr,
606 eh->ether_dhost, ETHER_ADDR_LEN) == 0)
607 m->m_flags |= M_BCAST;
608 else
609 m->m_flags |= M_MCAST;
610 ifp->if_imcasts++;
611 }
612
613 /* If the CRC is still on the packet, trim it off. */
614 if (m->m_flags & M_HASFCS) {
615 m_adj(m, -ETHER_CRC_LEN);
616 m->m_flags &= ~M_HASFCS;
617 }
618
619 ifp->if_ibytes += m->m_pkthdr.len;
620
621 #if NCARP > 0
622 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) {
623 /*
624 * clear M_PROMISC, in case the packets comes from a
625 * vlan
626 */
627 m->m_flags &= ~M_PROMISC;
628 if (carp_input(m, (uint8_t *)&eh->ether_shost,
629 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0)
630 return;
631 }
632 #endif /* NCARP > 0 */
633 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 &&
634 (ifp->if_flags & IFF_PROMISC) != 0 &&
635 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost,
636 ETHER_ADDR_LEN) != 0) {
637 m->m_flags |= M_PROMISC;
638 }
639
640 if ((m->m_flags & M_PROMISC) == 0) {
641 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
642 return;
643 if (m == NULL)
644 return;
645
646 eh = mtod(m, struct ether_header *);
647 etype = ntohs(eh->ether_type);
648 ehlen = sizeof(*eh);
649 }
650
651 #if NAGR > 0
652 if (ifp->if_agrprivate &&
653 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
654 m->m_flags &= ~M_PROMISC;
655 agr_input(ifp, m);
656 return;
657 }
658 #endif /* NAGR > 0 */
659
660 /*
661 * If VLANs are configured on the interface, check to
662 * see if the device performed the decapsulation and
663 * provided us with the tag.
664 */
665 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
666 #if NVLAN > 0
667 /*
668 * vlan_input() will either recursively call ether_input()
669 * or drop the packet.
670 */
671 vlan_input(ifp, m);
672 #else
673 m_freem(m);
674 #endif
675 return;
676 }
677
678 /*
679 * Handle protocols that expect to have the Ethernet header
680 * (and possibly FCS) intact.
681 */
682 switch (etype) {
683 case ETHERTYPE_VLAN: {
684 struct ether_vlan_header *evl = (void *)eh;
685 /*
686 * If there is a tag of 0, then the VLAN header was probably
687 * just being used to store the priority. Extract the ether
688 * type, and if IP or IPV6, let them deal with it.
689 */
690 if (m->m_len <= sizeof(*evl)
691 && EVL_VLANOFTAG(evl->evl_tag) == 0) {
692 etype = ntohs(evl->evl_proto);
693 ehlen = sizeof(*evl);
694 if ((m->m_flags & M_PROMISC) == 0
695 && (etype == ETHERTYPE_IP
696 || etype == ETHERTYPE_IPV6))
697 break;
698 }
699 #if NVLAN > 0
700 /*
701 * vlan_input() will either recursively call ether_input()
702 * or drop the packet.
703 */
704 if (((struct ethercom *)ifp)->ec_nvlans != 0)
705 vlan_input(ifp, m);
706 else
707 #endif /* NVLAN > 0 */
708 m_freem(m);
709 return;
710 }
711 #if NPPPOE > 0
712 case ETHERTYPE_PPPOEDISC:
713 pppoedisc_input(ifp, m);
714 return;
715 case ETHERTYPE_PPPOE:
716 pppoe_input(ifp, m);
717 return;
718 #endif /* NPPPOE > 0 */
719 case ETHERTYPE_SLOWPROTOCOLS: {
720 uint8_t subtype;
721
722 #if defined(DIAGNOSTIC)
723 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
724 panic("ether_input: too short slow protocol packet");
725 }
726 #endif
727 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
728 switch (subtype) {
729 #if NAGR > 0
730 case SLOWPROTOCOLS_SUBTYPE_LACP:
731 if (ifp->if_agrprivate) {
732 ieee8023ad_lacp_input(ifp, m);
733 return;
734 }
735 break;
736
737 case SLOWPROTOCOLS_SUBTYPE_MARKER:
738 if (ifp->if_agrprivate) {
739 ieee8023ad_marker_input(ifp, m);
740 return;
741 }
742 break;
743 #endif /* NAGR > 0 */
744 default:
745 if (subtype == 0 || subtype > 10) {
746 /* illegal value */
747 m_freem(m);
748 return;
749 }
750 /* unknown subtype */
751 break;
752 }
753 /* FALLTHROUGH */
754 }
755 default:
756 if (m->m_flags & M_PROMISC) {
757 m_freem(m);
758 return;
759 }
760 }
761
762 /* If the CRC is still on the packet, trim it off. */
763 if (m->m_flags & M_HASFCS) {
764 m_adj(m, -ETHER_CRC_LEN);
765 m->m_flags &= ~M_HASFCS;
766 }
767
768 if (etype > ETHERMTU + sizeof (struct ether_header)) {
769 /* Strip off the Ethernet header. */
770 m_adj(m, ehlen);
771
772 switch (etype) {
773 #ifdef INET
774 case ETHERTYPE_IP:
775 #ifdef GATEWAY
776 if (ipflow_fastforward(m))
777 return;
778 #endif
779 pktq = ip_pktq;
780 break;
781
782 case ETHERTYPE_ARP:
783 isr = NETISR_ARP;
784 inq = &arpintrq;
785 break;
786
787 case ETHERTYPE_REVARP:
788 revarpinput(m); /* XXX queue? */
789 return;
790 #endif
791 #ifdef INET6
792 case ETHERTYPE_IPV6:
793 if (__predict_false(!in6_present)) {
794 m_freem(m);
795 return;
796 }
797 #ifdef GATEWAY
798 if (ip6flow_fastforward(&m))
799 return;
800 #endif
801 pktq = ip6_pktq;
802 break;
803 #endif
804 #ifdef NETATALK
805 case ETHERTYPE_ATALK:
806 isr = NETISR_ATALK;
807 inq = &atintrq1;
808 break;
809 case ETHERTYPE_AARP:
810 /* probably this should be done with a NETISR as well */
811 aarpinput(ifp, m); /* XXX */
812 return;
813 #endif /* NETATALK */
814 #ifdef MPLS
815 case ETHERTYPE_MPLS:
816 isr = NETISR_MPLS;
817 inq = &mplsintrq;
818 break;
819 #endif
820 default:
821 m_freem(m);
822 return;
823 }
824 } else {
825 #if defined (LLC) || defined (NETATALK)
826 l = (struct llc *)(eh+1);
827 switch (l->llc_dsap) {
828 #ifdef NETATALK
829 case LLC_SNAP_LSAP:
830 switch (l->llc_control) {
831 case LLC_UI:
832 if (l->llc_ssap != LLC_SNAP_LSAP) {
833 goto dropanyway;
834 }
835
836 if (memcmp(&(l->llc_snap_org_code)[0],
837 at_org_code, sizeof(at_org_code)) == 0 &&
838 ntohs(l->llc_snap_ether_type) ==
839 ETHERTYPE_ATALK) {
840 inq = &atintrq2;
841 m_adj(m, sizeof(struct ether_header)
842 + sizeof(struct llc));
843 isr = NETISR_ATALK;
844 break;
845 }
846
847 if (memcmp(&(l->llc_snap_org_code)[0],
848 aarp_org_code,
849 sizeof(aarp_org_code)) == 0 &&
850 ntohs(l->llc_snap_ether_type) ==
851 ETHERTYPE_AARP) {
852 m_adj( m, sizeof(struct ether_header)
853 + sizeof(struct llc));
854 aarpinput(ifp, m); /* XXX */
855 return;
856 }
857
858 default:
859 goto dropanyway;
860 }
861 break;
862 dropanyway:
863 #endif
864 default:
865 m_freem(m);
866 return;
867 }
868 #else /* ISO || LLC || NETATALK*/
869 m_freem(m);
870 return;
871 #endif /* ISO || LLC || NETATALK*/
872 }
873
874 if (__predict_true(pktq)) {
875 const uint32_t h = pktq_rps_hash(m);
876 if (__predict_false(!pktq_enqueue(pktq, m, h))) {
877 m_freem(m);
878 }
879 return;
880 }
881
882 if (__predict_false(!inq)) {
883 /* Should not happen. */
884 m_freem(m);
885 return;
886 }
887 if (IF_QFULL(inq)) {
888 IF_DROP(inq);
889 m_freem(m);
890 } else {
891 IF_ENQUEUE(inq, m);
892 schednetisr(isr);
893 }
894 }
895
896 /*
897 * Convert Ethernet address to printable (loggable) representation.
898 */
899 char *
ether_sprintf(const u_char * ap)900 ether_sprintf(const u_char *ap)
901 {
902 static char etherbuf[3 * ETHER_ADDR_LEN];
903 return ether_snprintf(etherbuf, sizeof(etherbuf), ap);
904 }
905
906 char *
ether_snprintf(char * buf,size_t len,const u_char * ap)907 ether_snprintf(char *buf, size_t len, const u_char *ap)
908 {
909 char *cp = buf;
910 size_t i;
911
912 for (i = 0; i < len / 3; i++) {
913 *cp++ = hexdigits[*ap >> 4];
914 *cp++ = hexdigits[*ap++ & 0xf];
915 *cp++ = ':';
916 }
917 *--cp = '\0';
918 return buf;
919 }
920
921 /*
922 * Perform common duties while attaching to interface list
923 */
924 void
ether_ifattach(struct ifnet * ifp,const uint8_t * lla)925 ether_ifattach(struct ifnet *ifp, const uint8_t *lla)
926 {
927 struct ethercom *ec = (struct ethercom *)ifp;
928
929 ifp->if_extflags |= IFEF_OUTPUT_MPSAFE;
930 ifp->if_type = IFT_ETHER;
931 ifp->if_hdrlen = ETHER_HDR_LEN;
932 ifp->if_dlt = DLT_EN10MB;
933 ifp->if_mtu = ETHERMTU;
934 ifp->if_output = ether_output;
935 ifp->_if_input = ether_input;
936 if (ifp->if_baudrate == 0)
937 ifp->if_baudrate = IF_Mbps(10); /* just a default */
938
939 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla));
940
941 LIST_INIT(&ec->ec_multiaddrs);
942 ifp->if_broadcastaddr = etherbroadcastaddr;
943 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header));
944 #ifdef MBUFTRACE
945 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname,
946 sizeof(ec->ec_tx_mowner.mo_name));
947 strlcpy(ec->ec_tx_mowner.mo_descr, "tx",
948 sizeof(ec->ec_tx_mowner.mo_descr));
949 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname,
950 sizeof(ec->ec_rx_mowner.mo_name));
951 strlcpy(ec->ec_rx_mowner.mo_descr, "rx",
952 sizeof(ec->ec_rx_mowner.mo_descr));
953 MOWNER_ATTACH(&ec->ec_tx_mowner);
954 MOWNER_ATTACH(&ec->ec_rx_mowner);
955 ifp->if_mowner = &ec->ec_tx_mowner;
956 #endif
957 }
958
959 void
ether_ifdetach(struct ifnet * ifp)960 ether_ifdetach(struct ifnet *ifp)
961 {
962 struct ethercom *ec = (void *) ifp;
963 struct ether_multi *enm;
964 int s;
965
966 /*
967 * Prevent further calls to ioctl (for example turning off
968 * promiscuous mode from the bridge code), which eventually can
969 * call if_init() which can cause panics because the interface
970 * is in the process of being detached. Return device not configured
971 * instead.
972 */
973 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio;
974
975 #if NBRIDGE > 0
976 if (ifp->if_bridge)
977 bridge_ifdetach(ifp);
978 #endif
979
980 bpf_detach(ifp);
981
982 #if NVLAN > 0
983 if (ec->ec_nvlans)
984 vlan_ifdetach(ifp);
985 #endif
986
987 s = splnet();
988 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
989 LIST_REMOVE(enm, enm_list);
990 free(enm, M_IFMADDR);
991 ec->ec_multicnt--;
992 }
993 splx(s);
994
995 ifp->if_mowner = NULL;
996 MOWNER_DETACH(&ec->ec_rx_mowner);
997 MOWNER_DETACH(&ec->ec_tx_mowner);
998 }
999
1000 #if 0
1001 /*
1002 * This is for reference. We have a table-driven version
1003 * of the little-endian crc32 generator, which is faster
1004 * than the double-loop.
1005 */
1006 uint32_t
1007 ether_crc32_le(const uint8_t *buf, size_t len)
1008 {
1009 uint32_t c, crc, carry;
1010 size_t i, j;
1011
1012 crc = 0xffffffffU; /* initial value */
1013
1014 for (i = 0; i < len; i++) {
1015 c = buf[i];
1016 for (j = 0; j < 8; j++) {
1017 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1018 crc >>= 1;
1019 c >>= 1;
1020 if (carry)
1021 crc = (crc ^ ETHER_CRC_POLY_LE);
1022 }
1023 }
1024
1025 return (crc);
1026 }
1027 #else
1028 uint32_t
ether_crc32_le(const uint8_t * buf,size_t len)1029 ether_crc32_le(const uint8_t *buf, size_t len)
1030 {
1031 static const uint32_t crctab[] = {
1032 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1033 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1034 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1035 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1036 };
1037 uint32_t crc;
1038 size_t i;
1039
1040 crc = 0xffffffffU; /* initial value */
1041
1042 for (i = 0; i < len; i++) {
1043 crc ^= buf[i];
1044 crc = (crc >> 4) ^ crctab[crc & 0xf];
1045 crc = (crc >> 4) ^ crctab[crc & 0xf];
1046 }
1047
1048 return (crc);
1049 }
1050 #endif
1051
1052 uint32_t
ether_crc32_be(const uint8_t * buf,size_t len)1053 ether_crc32_be(const uint8_t *buf, size_t len)
1054 {
1055 uint32_t c, crc, carry;
1056 size_t i, j;
1057
1058 crc = 0xffffffffU; /* initial value */
1059
1060 for (i = 0; i < len; i++) {
1061 c = buf[i];
1062 for (j = 0; j < 8; j++) {
1063 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1064 crc <<= 1;
1065 c >>= 1;
1066 if (carry)
1067 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1068 }
1069 }
1070
1071 return (crc);
1072 }
1073
1074 #ifdef INET
1075 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] =
1076 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
1077 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] =
1078 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
1079 #endif
1080 #ifdef INET6
1081 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] =
1082 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
1083 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] =
1084 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
1085 #endif
1086
1087 /*
1088 * ether_aton implementation, not using a static buffer.
1089 */
1090 int
ether_aton_r(u_char * dest,size_t len,const char * str)1091 ether_aton_r(u_char *dest, size_t len, const char *str)
1092 {
1093 const u_char *cp = (const void *)str;
1094 u_char *ep;
1095
1096 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10))
1097
1098 if (len < ETHER_ADDR_LEN)
1099 return ENOSPC;
1100
1101 ep = dest + ETHER_ADDR_LEN;
1102
1103 while (*cp) {
1104 if (!isxdigit(*cp))
1105 return EINVAL;
1106 *dest = atox(*cp);
1107 cp++;
1108 if (isxdigit(*cp)) {
1109 *dest = (*dest << 4) | atox(*cp);
1110 dest++;
1111 cp++;
1112 } else
1113 dest++;
1114 if (dest == ep)
1115 return *cp == '\0' ? 0 : ENAMETOOLONG;
1116 switch (*cp) {
1117 case ':':
1118 case '-':
1119 case '.':
1120 cp++;
1121 break;
1122 }
1123 }
1124 return ENOBUFS;
1125 }
1126
1127 /*
1128 * Convert a sockaddr into an Ethernet address or range of Ethernet
1129 * addresses.
1130 */
1131 int
ether_multiaddr(const struct sockaddr * sa,uint8_t addrlo[ETHER_ADDR_LEN],uint8_t addrhi[ETHER_ADDR_LEN])1132 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN],
1133 uint8_t addrhi[ETHER_ADDR_LEN])
1134 {
1135 #ifdef INET
1136 const struct sockaddr_in *sin;
1137 #endif /* INET */
1138 #ifdef INET6
1139 const struct sockaddr_in6 *sin6;
1140 #endif /* INET6 */
1141
1142 switch (sa->sa_family) {
1143
1144 case AF_UNSPEC:
1145 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN);
1146 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1147 break;
1148
1149 #ifdef INET
1150 case AF_INET:
1151 sin = satocsin(sa);
1152 if (sin->sin_addr.s_addr == INADDR_ANY) {
1153 /*
1154 * An IP address of INADDR_ANY means listen to
1155 * or stop listening to all of the Ethernet
1156 * multicast addresses used for IP.
1157 * (This is for the sake of IP multicast routers.)
1158 */
1159 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN);
1160 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN);
1161 }
1162 else {
1163 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
1164 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1165 }
1166 break;
1167 #endif
1168 #ifdef INET6
1169 case AF_INET6:
1170 sin6 = satocsin6(sa);
1171 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1172 /*
1173 * An IP6 address of 0 means listen to or stop
1174 * listening to all of the Ethernet multicast
1175 * address used for IP6.
1176 * (This is used for multicast routers.)
1177 */
1178 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN);
1179 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN);
1180 } else {
1181 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
1182 memcpy(addrhi, addrlo, ETHER_ADDR_LEN);
1183 }
1184 break;
1185 #endif
1186
1187 default:
1188 return EAFNOSUPPORT;
1189 }
1190 return 0;
1191 }
1192
1193 /*
1194 * Add an Ethernet multicast address or range of addresses to the list for a
1195 * given interface.
1196 */
1197 int
ether_addmulti(const struct sockaddr * sa,struct ethercom * ec)1198 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec)
1199 {
1200 struct ether_multi *enm;
1201 u_char addrlo[ETHER_ADDR_LEN];
1202 u_char addrhi[ETHER_ADDR_LEN];
1203 int s = splnet(), error;
1204
1205 error = ether_multiaddr(sa, addrlo, addrhi);
1206 if (error != 0) {
1207 splx(s);
1208 return error;
1209 }
1210
1211 /*
1212 * Verify that we have valid Ethernet multicast addresses.
1213 */
1214 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) {
1215 splx(s);
1216 return EINVAL;
1217 }
1218 /*
1219 * See if the address range is already in the list.
1220 */
1221 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1222 if (enm != NULL) {
1223 /*
1224 * Found it; just increment the reference count.
1225 */
1226 ++enm->enm_refcount;
1227 splx(s);
1228 return 0;
1229 }
1230 /*
1231 * New address or range; malloc a new multicast record
1232 * and link it into the interface's multicast list.
1233 */
1234 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
1235 if (enm == NULL) {
1236 splx(s);
1237 return ENOBUFS;
1238 }
1239 memcpy(enm->enm_addrlo, addrlo, 6);
1240 memcpy(enm->enm_addrhi, addrhi, 6);
1241 enm->enm_refcount = 1;
1242 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
1243 ec->ec_multicnt++;
1244 splx(s);
1245 /*
1246 * Return ENETRESET to inform the driver that the list has changed
1247 * and its reception filter should be adjusted accordingly.
1248 */
1249 return ENETRESET;
1250 }
1251
1252 /*
1253 * Delete a multicast address record.
1254 */
1255 int
ether_delmulti(const struct sockaddr * sa,struct ethercom * ec)1256 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec)
1257 {
1258 struct ether_multi *enm;
1259 u_char addrlo[ETHER_ADDR_LEN];
1260 u_char addrhi[ETHER_ADDR_LEN];
1261 int s = splnet(), error;
1262
1263 error = ether_multiaddr(sa, addrlo, addrhi);
1264 if (error != 0) {
1265 splx(s);
1266 return (error);
1267 }
1268
1269 /*
1270 * Look ur the address in our list.
1271 */
1272 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1273 if (enm == NULL) {
1274 splx(s);
1275 return (ENXIO);
1276 }
1277 if (--enm->enm_refcount != 0) {
1278 /*
1279 * Still some claims to this record.
1280 */
1281 splx(s);
1282 return (0);
1283 }
1284 /*
1285 * No remaining claims to this record; unlink and free it.
1286 */
1287 LIST_REMOVE(enm, enm_list);
1288 free(enm, M_IFMADDR);
1289 ec->ec_multicnt--;
1290 splx(s);
1291 /*
1292 * Return ENETRESET to inform the driver that the list has changed
1293 * and its reception filter should be adjusted accordingly.
1294 */
1295 return (ENETRESET);
1296 }
1297
1298 void
ether_set_ifflags_cb(struct ethercom * ec,ether_cb_t cb)1299 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb)
1300 {
1301 ec->ec_ifflags_cb = cb;
1302 }
1303
1304 /*
1305 * Common ioctls for Ethernet interfaces. Note, we must be
1306 * called at splnet().
1307 */
1308 int
ether_ioctl(struct ifnet * ifp,u_long cmd,void * data)1309 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data)
1310 {
1311 struct ethercom *ec = (void *) ifp;
1312 struct eccapreq *eccr;
1313 struct ifreq *ifr = (struct ifreq *)data;
1314 struct if_laddrreq *iflr = data;
1315 const struct sockaddr_dl *sdl;
1316 static const uint8_t zero[ETHER_ADDR_LEN];
1317 int error;
1318
1319 switch (cmd) {
1320 case SIOCINITIFADDR:
1321 {
1322 struct ifaddr *ifa = (struct ifaddr *)data;
1323 if (ifa->ifa_addr->sa_family != AF_LINK
1324 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
1325 (IFF_UP|IFF_RUNNING)) {
1326 ifp->if_flags |= IFF_UP;
1327 if ((error = (*ifp->if_init)(ifp)) != 0)
1328 return error;
1329 }
1330 #ifdef INET
1331 if (ifa->ifa_addr->sa_family == AF_INET)
1332 arp_ifinit(ifp, ifa);
1333 #endif /* INET */
1334 return 0;
1335 }
1336
1337 case SIOCSIFMTU:
1338 {
1339 int maxmtu;
1340
1341 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
1342 maxmtu = ETHERMTU_JUMBO;
1343 else
1344 maxmtu = ETHERMTU;
1345
1346 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
1347 return EINVAL;
1348 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET)
1349 return error;
1350 else if (ifp->if_flags & IFF_UP) {
1351 /* Make sure the device notices the MTU change. */
1352 return (*ifp->if_init)(ifp);
1353 } else
1354 return 0;
1355 }
1356
1357 case SIOCSIFFLAGS:
1358 if ((error = ifioctl_common(ifp, cmd, data)) != 0)
1359 return error;
1360 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
1361 case IFF_RUNNING:
1362 /*
1363 * If interface is marked down and it is running,
1364 * then stop and disable it.
1365 */
1366 (*ifp->if_stop)(ifp, 1);
1367 break;
1368 case IFF_UP:
1369 /*
1370 * If interface is marked up and it is stopped, then
1371 * start it.
1372 */
1373 return (*ifp->if_init)(ifp);
1374 case IFF_UP|IFF_RUNNING:
1375 error = 0;
1376 if (ec->ec_ifflags_cb == NULL ||
1377 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) {
1378 /*
1379 * Reset the interface to pick up
1380 * changes in any other flags that
1381 * affect the hardware state.
1382 */
1383 return (*ifp->if_init)(ifp);
1384 } else
1385 return error;
1386 case 0:
1387 break;
1388 }
1389 return 0;
1390 case SIOCGETHERCAP:
1391 eccr = (struct eccapreq *)data;
1392 eccr->eccr_capabilities = ec->ec_capabilities;
1393 eccr->eccr_capenable = ec->ec_capenable;
1394 return 0;
1395 case SIOCADDMULTI:
1396 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec);
1397 case SIOCDELMULTI:
1398 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec);
1399 case SIOCSIFMEDIA:
1400 case SIOCGIFMEDIA:
1401 if (ec->ec_mii == NULL)
1402 return ENOTTY;
1403 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd);
1404 case SIOCALIFADDR:
1405 sdl = satocsdl(sstocsa(&iflr->addr));
1406 if (sdl->sdl_family != AF_LINK)
1407 ;
1408 else if (ETHER_IS_MULTICAST(CLLADDR(sdl)))
1409 return EINVAL;
1410 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0)
1411 return EINVAL;
1412 /*FALLTHROUGH*/
1413 default:
1414 return ifioctl_common(ifp, cmd, data);
1415 }
1416 return 0;
1417 }
1418
1419 /*
1420 * Enable/disable passing VLAN packets if the parent interface supports it.
1421 * Return:
1422 * 0: Ok
1423 * -1: Parent interface does not support vlans
1424 * >0: Error
1425 */
1426 int
ether_enable_vlan_mtu(struct ifnet * ifp)1427 ether_enable_vlan_mtu(struct ifnet *ifp)
1428 {
1429 int error;
1430 struct ethercom *ec = (void *)ifp;
1431
1432 /* Already have VLAN's do nothing. */
1433 if (ec->ec_nvlans != 0)
1434 return 0;
1435
1436 /* Parent does not support VLAN's */
1437 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0)
1438 return -1;
1439
1440 /*
1441 * Parent supports the VLAN_MTU capability,
1442 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames;
1443 * enable it.
1444 */
1445 ec->ec_capenable |= ETHERCAP_VLAN_MTU;
1446
1447 /* Interface is down, defer for later */
1448 if ((ifp->if_flags & IFF_UP) == 0)
1449 return 0;
1450
1451 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0)
1452 return 0;
1453
1454 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU;
1455 return error;
1456 }
1457
1458 int
ether_disable_vlan_mtu(struct ifnet * ifp)1459 ether_disable_vlan_mtu(struct ifnet *ifp)
1460 {
1461 int error;
1462 struct ethercom *ec = (void *)ifp;
1463
1464 /* We still have VLAN's, defer for later */
1465 if (ec->ec_nvlans != 0)
1466 return 0;
1467
1468 /* Parent does not support VLAB's, nothing to do. */
1469 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0)
1470 return -1;
1471
1472 /*
1473 * Disable Tx/Rx of VLAN-sized frames.
1474 */
1475 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU;
1476
1477 /* Interface is down, defer for later */
1478 if ((ifp->if_flags & IFF_UP) == 0)
1479 return 0;
1480
1481 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0)
1482 return 0;
1483
1484 ec->ec_capenable |= ETHERCAP_VLAN_MTU;
1485 return error;
1486 }
1487
1488 static int
ether_multicast_sysctl(SYSCTLFN_ARGS)1489 ether_multicast_sysctl(SYSCTLFN_ARGS)
1490 {
1491 struct ether_multi *enm;
1492 struct ether_multi_sysctl addr;
1493 struct ifnet *ifp;
1494 struct ethercom *ec;
1495 int error = 0;
1496 size_t written;
1497 struct psref psref;
1498 int bound;
1499
1500 if (namelen != 1)
1501 return EINVAL;
1502
1503 bound = curlwp_bind();
1504 ifp = if_get_byindex(name[0], &psref);
1505 if (ifp == NULL) {
1506 error = ENODEV;
1507 goto out;
1508 }
1509 if (ifp->if_type != IFT_ETHER) {
1510 if_put(ifp, &psref);
1511 *oldlenp = 0;
1512 goto out;
1513 }
1514 ec = (struct ethercom *)ifp;
1515
1516 if (oldp == NULL) {
1517 if_put(ifp, &psref);
1518 *oldlenp = ec->ec_multicnt * sizeof(addr);
1519 goto out;
1520 }
1521
1522 memset(&addr, 0, sizeof(addr));
1523 error = 0;
1524 written = 0;
1525
1526 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) {
1527 if (written + sizeof(addr) > *oldlenp)
1528 break;
1529 addr.enm_refcount = enm->enm_refcount;
1530 memcpy(addr.enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN);
1531 memcpy(addr.enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN);
1532 error = sysctl_copyout(l, &addr, oldp, sizeof(addr));
1533 if (error)
1534 break;
1535 written += sizeof(addr);
1536 oldp = (char *)oldp + sizeof(addr);
1537 }
1538 if_put(ifp, &psref);
1539
1540 *oldlenp = written;
1541 out:
1542 curlwp_bindx(bound);
1543 return error;
1544 }
1545
1546 SYSCTL_SETUP(sysctl_net_ether_setup, "sysctl net.ether subtree setup")
1547 {
1548 const struct sysctlnode *rnode = NULL;
1549
1550 sysctl_createv(clog, 0, NULL, &rnode,
1551 CTLFLAG_PERMANENT,
1552 CTLTYPE_NODE, "ether",
1553 SYSCTL_DESCR("Ethernet-specific information"),
1554 NULL, 0, NULL, 0,
1555 CTL_NET, CTL_CREATE, CTL_EOL);
1556
1557 sysctl_createv(clog, 0, &rnode, NULL,
1558 CTLFLAG_PERMANENT,
1559 CTLTYPE_NODE, "multicast",
1560 SYSCTL_DESCR("multicast addresses"),
1561 ether_multicast_sysctl, 0, NULL, 0,
1562 CTL_CREATE, CTL_EOL);
1563 }
1564
1565 void
etherinit(void)1566 etherinit(void)
1567 {
1568 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET);
1569 }
1570