if_ethersubr.c revision 1.137 1 /* $NetBSD: if_ethersubr.c,v 1.137 2006/11/23 04:07:07 rpaulo 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 1.137 2006/11/23 04:07:07 rpaulo Exp $");
65
66 #include "opt_inet.h"
67 #include "opt_atalk.h"
68 #include "opt_iso.h"
69 #include "opt_ipx.h"
70 #include "opt_mbuftrace.h"
71 #include "opt_gateway.h"
72 #include "opt_pfil_hooks.h"
73 #include "opt_pppoe.h"
74 #include "vlan.h"
75 #include "pppoe.h"
76 #include "bridge.h"
77 #include "bpfilter.h"
78 #include "arp.h"
79 #include "agr.h"
80
81 #include <sys/param.h>
82 #include <sys/systm.h>
83 #include <sys/kernel.h>
84 #include <sys/callout.h>
85 #include <sys/malloc.h>
86 #include <sys/mbuf.h>
87 #include <sys/protosw.h>
88 #include <sys/socket.h>
89 #include <sys/ioctl.h>
90 #include <sys/errno.h>
91 #include <sys/syslog.h>
92 #include <sys/kauth.h>
93
94 #include <machine/cpu.h>
95
96 #include <net/if.h>
97 #include <net/netisr.h>
98 #include <net/route.h>
99 #include <net/if_llc.h>
100 #include <net/if_dl.h>
101 #include <net/if_types.h>
102
103 #if NARP == 0
104 /*
105 * XXX there should really be a way to issue this warning from within config(8)
106 */
107 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK.
108 #endif
109
110 #if NBPFILTER > 0
111 #include <net/bpf.h>
112 #endif
113
114 #include <net/if_ether.h>
115 #if NVLAN > 0
116 #include <net/if_vlanvar.h>
117 #endif
118
119 #if NPPPOE > 0
120 #include <net/if_pppoe.h>
121 #endif
122
123 #if NAGR > 0
124 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */
125 #include <net/agr/ieee8023ad.h>
126 #include <net/agr/if_agrvar.h>
127 #endif
128
129 #if NBRIDGE > 0
130 #include <net/if_bridgevar.h>
131 #endif
132
133 #include <netinet/in.h>
134 #ifdef INET
135 #include <netinet/in_var.h>
136 #endif
137 #include <netinet/if_inarp.h>
138
139 #ifdef INET6
140 #ifndef INET
141 #include <netinet/in.h>
142 #endif
143 #include <netinet6/in6_var.h>
144 #include <netinet6/nd6.h>
145 #endif
146
147
148 #include "carp.h"
149 #if NCARP > 0
150 #include <netinet/ip_carp.h>
151 #endif
152
153 #ifdef IPX
154 #include <netipx/ipx.h>
155 #include <netipx/ipx_if.h>
156 #endif
157
158 #ifdef ISO
159 #include <netiso/argo_debug.h>
160 #include <netiso/iso.h>
161 #include <netiso/iso_var.h>
162 #include <netiso/iso_snpac.h>
163 #endif
164
165
166
167 #ifdef NETATALK
168 #include <netatalk/at.h>
169 #include <netatalk/at_var.h>
170 #include <netatalk/at_extern.h>
171
172 #define llc_snap_org_code llc_un.type_snap.org_code
173 #define llc_snap_ether_type llc_un.type_snap.ether_type
174
175 extern u_char at_org_code[3];
176 extern u_char aarp_org_code[3];
177 #endif /* NETATALK */
178
179 static struct timeval bigpktppslim_last;
180 static int bigpktppslim = 2; /* XXX */
181 static int bigpktpps_count;
182
183
184 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] =
185 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
186 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] =
187 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 };
188 #define senderr(e) { error = (e); goto bad;}
189
190 #define SIN(x) ((struct sockaddr_in *)x)
191
192 static int ether_output(struct ifnet *, struct mbuf *,
193 struct sockaddr *, struct rtentry *);
194
195 /*
196 * Ethernet output routine.
197 * Encapsulate a packet of type family for the local net.
198 * Assumes that ifp is actually pointer to ethercom structure.
199 */
200 static int
201 ether_output(struct ifnet *ifp0, struct mbuf *m0, struct sockaddr *dst,
202 struct rtentry *rt0)
203 {
204 u_int16_t etype = 0;
205 int error = 0, hdrcmplt = 0;
206 u_char esrc[6], edst[6];
207 struct mbuf *m = m0;
208 struct rtentry *rt;
209 struct mbuf *mcopy = (struct mbuf *)0;
210 struct ether_header *eh;
211 struct ifnet *ifp = ifp0;
212 ALTQ_DECL(struct altq_pktattr pktattr;)
213 #ifdef INET
214 struct arphdr *ah;
215 #endif /* INET */
216 #ifdef NETATALK
217 struct at_ifaddr *aa;
218 #endif /* NETATALK */
219
220 #ifdef MBUFTRACE
221 m_claimm(m, ifp->if_mowner);
222 #endif
223
224 #if NCARP > 0
225 if (ifp->if_type == IFT_CARP) {
226 struct ifaddr *ifa;
227
228 /* loop back if this is going to the carp interface */
229 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP &&
230 (ifa = ifa_ifwithaddr(dst)) != NULL &&
231 ifa->ifa_ifp == ifp0)
232 return (looutput(ifp0, m, dst, rt0));
233
234 ifp = ifp->if_carpdev;
235 /* ac = (struct arpcom *)ifp; */
236
237 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
238 (IFF_UP|IFF_RUNNING))
239 senderr(ENETDOWN);
240 }
241 #endif /* NCARP > 0 */
242
243 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
244 senderr(ENETDOWN);
245 if ((rt = rt0) != NULL) {
246 if ((rt->rt_flags & RTF_UP) == 0) {
247 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) {
248 rt->rt_refcnt--;
249 if (rt->rt_ifp != ifp)
250 return (*rt->rt_ifp->if_output)
251 (ifp, m0, dst, rt);
252 } else
253 senderr(EHOSTUNREACH);
254 }
255 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) {
256 if (rt->rt_gwroute == 0)
257 goto lookup;
258 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
259 rtfree(rt); rt = rt0;
260 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
261 if ((rt = rt->rt_gwroute) == 0)
262 senderr(EHOSTUNREACH);
263 /* the "G" test below also prevents rt == rt0 */
264 if ((rt->rt_flags & RTF_GATEWAY) ||
265 (rt->rt_ifp != ifp)) {
266 rt->rt_refcnt--;
267 rt0->rt_gwroute = 0;
268 senderr(EHOSTUNREACH);
269 }
270 }
271 }
272 if (rt->rt_flags & RTF_REJECT)
273 if (rt->rt_rmx.rmx_expire == 0 ||
274 (u_long) time_second < rt->rt_rmx.rmx_expire)
275 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
276 }
277
278 switch (dst->sa_family) {
279
280 #ifdef INET
281 case AF_INET:
282 if (m->m_flags & M_BCAST)
283 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
284
285 else if (m->m_flags & M_MCAST) {
286 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr,
287 (caddr_t)edst)
288
289 } else if (!arpresolve(ifp, rt, m, dst, edst))
290 return (0); /* if not yet resolved */
291 /* If broadcasting on a simplex interface, loopback a copy */
292 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
293 mcopy = m_copy(m, 0, (int)M_COPYALL);
294 etype = htons(ETHERTYPE_IP);
295 break;
296
297 case AF_ARP:
298 ah = mtod(m, struct arphdr *);
299 if (m->m_flags & M_BCAST)
300 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
301 else {
302 caddr_t tha = ar_tha(ah);
303
304 KASSERT(tha);
305 bcopy(tha, (caddr_t)edst, sizeof(edst));
306 }
307
308 ah->ar_hrd = htons(ARPHRD_ETHER);
309
310 switch (ntohs(ah->ar_op)) {
311 case ARPOP_REVREQUEST:
312 case ARPOP_REVREPLY:
313 etype = htons(ETHERTYPE_REVARP);
314 break;
315
316 case ARPOP_REQUEST:
317 case ARPOP_REPLY:
318 default:
319 etype = htons(ETHERTYPE_ARP);
320 }
321
322 break;
323 #endif
324 #ifdef INET6
325 case AF_INET6:
326 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){
327 /* something bad happened */
328 return (0);
329 }
330 etype = htons(ETHERTYPE_IPV6);
331 break;
332 #endif
333 #ifdef NETATALK
334 case AF_APPLETALK:
335 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) {
336 #ifdef NETATALKDEBUG
337 printf("aarpresolv failed\n");
338 #endif /* NETATALKDEBUG */
339 return (0);
340 }
341 /*
342 * ifaddr is the first thing in at_ifaddr
343 */
344 aa = (struct at_ifaddr *) at_ifawithnet(
345 (struct sockaddr_at *)dst, ifp);
346 if (aa == NULL)
347 goto bad;
348
349 /*
350 * In the phase 2 case, we need to prepend an mbuf for the
351 * llc header. Since we must preserve the value of m,
352 * which is passed to us by value, we m_copy() the first
353 * mbuf, and use it for our llc header.
354 */
355 if (aa->aa_flags & AFA_PHASE2) {
356 struct llc llc;
357
358 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT);
359 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
360 llc.llc_control = LLC_UI;
361 bcopy(at_org_code, llc.llc_snap_org_code,
362 sizeof(llc.llc_snap_org_code));
363 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK);
364 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
365 } else {
366 etype = htons(ETHERTYPE_ATALK);
367 }
368 break;
369 #endif /* NETATALK */
370 #ifdef IPX
371 case AF_IPX:
372 etype = htons(ETHERTYPE_IPX);
373 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
374 (caddr_t)edst, sizeof (edst));
375 /* If broadcasting on a simplex interface, loopback a copy */
376 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
377 mcopy = m_copy(m, 0, (int)M_COPYALL);
378 break;
379 #endif
380 #ifdef ISO
381 case AF_ISO: {
382 int snpalen;
383 struct llc *l;
384 struct sockaddr_dl *sdl;
385
386 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
387 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
388 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
389 } else {
390 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
391 (char *)edst, &snpalen);
392 if (error)
393 goto bad; /* Not Resolved */
394 }
395 /* If broadcasting on a simplex interface, loopback a copy */
396 if (*edst & 1)
397 m->m_flags |= (M_BCAST|M_MCAST);
398 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
399 (mcopy = m_copy(m, 0, (int)M_COPYALL))) {
400 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
401 if (mcopy) {
402 eh = mtod(mcopy, struct ether_header *);
403 bcopy((caddr_t)edst,
404 (caddr_t)eh->ether_dhost, sizeof (edst));
405 bcopy(LLADDR(ifp->if_sadl),
406 (caddr_t)eh->ether_shost, sizeof (edst));
407 }
408 }
409 M_PREPEND(m, 3, M_DONTWAIT);
410 if (m == NULL)
411 return (0);
412 l = mtod(m, struct llc *);
413 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
414 l->llc_control = LLC_UI;
415 #ifdef ARGO_DEBUG
416 if (argo_debug[D_ETHER]) {
417 int i;
418 printf("unoutput: sending pkt to: ");
419 for (i=0; i<6; i++)
420 printf("%x ", edst[i] & 0xff);
421 printf("\n");
422 }
423 #endif
424 } break;
425 #endif /* ISO */
426
427 case pseudo_AF_HDRCMPLT:
428 hdrcmplt = 1;
429 eh = (struct ether_header *)dst->sa_data;
430 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc));
431 /* FALLTHROUGH */
432
433 case AF_UNSPEC:
434 eh = (struct ether_header *)dst->sa_data;
435 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));
436 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */
437 etype = eh->ether_type;
438 break;
439
440 default:
441 printf("%s: can't handle af%d\n", ifp->if_xname,
442 dst->sa_family);
443 senderr(EAFNOSUPPORT);
444 }
445
446 if (mcopy)
447 (void) looutput(ifp, mcopy, dst, rt);
448
449 /* If no ether type is set, this must be a 802.2 formatted packet.
450 */
451 if (etype == 0)
452 etype = htons(m->m_pkthdr.len);
453 /*
454 * Add local net header. If no space in first mbuf,
455 * allocate another.
456 */
457 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
458 if (m == 0)
459 senderr(ENOBUFS);
460 eh = mtod(m, struct ether_header *);
461 /* Note: etype is already in network byte order. */
462 #ifdef __NO_STRICT_ALIGNMENT
463 eh->ether_type = etype;
464 #else
465 {
466 uint8_t *dstp = (uint8_t *) &eh->ether_type;
467 #if BYTE_ORDER == BIG_ENDIAN
468 dstp[0] = etype >> 8;
469 dstp[1] = etype;
470 #else
471 dstp[0] = etype;
472 dstp[1] = etype >> 8;
473 #endif /* BYTE_ORDER == BIG_ENDIAN */
474 }
475 #endif /* __NO_STRICT_ALIGNMENT */
476 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));
477 if (hdrcmplt)
478 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost,
479 sizeof(eh->ether_shost));
480 else
481 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost,
482 sizeof(eh->ether_shost));
483
484 #if NCARP > 0
485 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) {
486 bcopy(LLADDR(ifp0->if_sadl), (caddr_t)eh->ether_shost,
487 sizeof(eh->ether_shost));
488 }
489 #endif /* NCARP > 0 */
490
491 #ifdef PFIL_HOOKS
492 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0)
493 return (error);
494 if (m == NULL)
495 return (0);
496 #endif
497
498 #if NBRIDGE > 0
499 /*
500 * Bridges require special output handling.
501 */
502 if (ifp->if_bridge)
503 return (bridge_output(ifp, m, NULL, NULL));
504 #endif
505
506 #if NCARP > 0
507 if (ifp != ifp0)
508 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN;
509 #endif /* NCARP > 0 */
510
511 #ifdef ALTQ
512 /*
513 * If ALTQ is enabled on the parent interface, do
514 * classification; the queueing discipline might not
515 * require classification, but might require the
516 * address family/header pointer in the pktattr.
517 */
518 if (ALTQ_IS_ENABLED(&ifp->if_snd))
519 altq_etherclassify(&ifp->if_snd, m, &pktattr);
520 #endif
521
522 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
523
524 bad:
525 if (m)
526 m_freem(m);
527 return (error);
528 }
529
530 #ifdef ALTQ
531 /*
532 * This routine is a slight hack to allow a packet to be classified
533 * if the Ethernet headers are present. It will go away when ALTQ's
534 * classification engine understands link headers.
535 */
536 void
537 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
538 struct altq_pktattr *pktattr)
539 {
540 struct ether_header *eh;
541 u_int16_t ether_type;
542 int hlen, af, hdrsize;
543 caddr_t hdr;
544
545 hlen = ETHER_HDR_LEN;
546 eh = mtod(m, struct ether_header *);
547
548 ether_type = htons(eh->ether_type);
549
550 if (ether_type < ETHERMTU) {
551 /* LLC/SNAP */
552 struct llc *llc = (struct llc *)(eh + 1);
553 hlen += 8;
554
555 if (m->m_len < hlen ||
556 llc->llc_dsap != LLC_SNAP_LSAP ||
557 llc->llc_ssap != LLC_SNAP_LSAP ||
558 llc->llc_control != LLC_UI) {
559 /* Not SNAP. */
560 goto bad;
561 }
562
563 ether_type = htons(llc->llc_un.type_snap.ether_type);
564 }
565
566 switch (ether_type) {
567 case ETHERTYPE_IP:
568 af = AF_INET;
569 hdrsize = 20; /* sizeof(struct ip) */
570 break;
571
572 case ETHERTYPE_IPV6:
573 af = AF_INET6;
574 hdrsize = 40; /* sizeof(struct ip6_hdr) */
575 break;
576
577 default:
578 af = AF_UNSPEC;
579 hdrsize = 0;
580 break;
581 }
582
583 while (m->m_len <= hlen) {
584 hlen -= m->m_len;
585 m = m->m_next;
586 }
587 if (m->m_len < (hlen + hdrsize)) {
588 /*
589 * protocol header not in a single mbuf.
590 * We can't cope with this situation right
591 * now (but it shouldn't ever happen, really, anyhow).
592 */
593 #ifdef DEBUG
594 printf("altq_etherclassify: headers span multiple mbufs: "
595 "%d < %d\n", m->m_len, (hlen + hdrsize));
596 #endif
597 goto bad;
598 }
599
600 m->m_data += hlen;
601 m->m_len -= hlen;
602
603 hdr = mtod(m, caddr_t);
604
605 if (ALTQ_NEEDS_CLASSIFY(ifq))
606 pktattr->pattr_class =
607 (*ifq->altq_classify)(ifq->altq_clfier, m, af);
608 pktattr->pattr_af = af;
609 pktattr->pattr_hdr = hdr;
610
611 m->m_data -= hlen;
612 m->m_len += hlen;
613
614 return;
615
616 bad:
617 pktattr->pattr_class = NULL;
618 pktattr->pattr_hdr = NULL;
619 pktattr->pattr_af = AF_UNSPEC;
620 }
621 #endif /* ALTQ */
622
623 /*
624 * Process a received Ethernet packet;
625 * the packet is in the mbuf chain m with
626 * the ether header.
627 */
628 void
629 ether_input(struct ifnet *ifp, struct mbuf *m)
630 {
631 struct ethercom *ec = (struct ethercom *) ifp;
632 struct ifqueue *inq;
633 u_int16_t etype;
634 struct ether_header *eh;
635 #if defined (ISO) || defined (LLC) || defined(NETATALK)
636 struct llc *l;
637 #endif
638
639 if ((ifp->if_flags & IFF_UP) == 0) {
640 m_freem(m);
641 return;
642 }
643
644 #ifdef MBUFTRACE
645 m_claimm(m, &ec->ec_rx_mowner);
646 #endif
647 eh = mtod(m, struct ether_header *);
648 etype = ntohs(eh->ether_type);
649
650 /*
651 * Determine if the packet is within its size limits.
652 */
653 if (m->m_pkthdr.len >
654 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) {
655 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count,
656 bigpktppslim)) {
657 printf("%s: discarding oversize frame (len=%d)\n",
658 ifp->if_xname, m->m_pkthdr.len);
659 }
660 m_freem(m);
661 return;
662 }
663
664 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
665 /*
666 * If this is not a simplex interface, drop the packet
667 * if it came from us.
668 */
669 if ((ifp->if_flags & IFF_SIMPLEX) == 0 &&
670 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost,
671 ETHER_ADDR_LEN) == 0) {
672 m_freem(m);
673 return;
674 }
675
676 if (memcmp(etherbroadcastaddr,
677 eh->ether_dhost, ETHER_ADDR_LEN) == 0)
678 m->m_flags |= M_BCAST;
679 else
680 m->m_flags |= M_MCAST;
681 ifp->if_imcasts++;
682 }
683
684 /* If the CRC is still on the packet, trim it off. */
685 if (m->m_flags & M_HASFCS) {
686 m_adj(m, -ETHER_CRC_LEN);
687 m->m_flags &= ~M_HASFCS;
688 }
689
690 ifp->if_ibytes += m->m_pkthdr.len;
691
692 #if NBRIDGE > 0
693 /*
694 * Tap the packet off here for a bridge. bridge_input()
695 * will return NULL if it has consumed the packet, otherwise
696 * it gets processed as normal. Note that bridge_input()
697 * will always return the original packet if we need to
698 * process it locally.
699 */
700 if (ifp->if_bridge) {
701 /* clear M_PROMISC, in case the packets comes from a vlan */
702 m->m_flags &= ~M_PROMISC;
703 m = bridge_input(ifp, m);
704 if (m == NULL)
705 return;
706
707 /*
708 * Bridge has determined that the packet is for us.
709 * Update our interface pointer -- we may have had
710 * to "bridge" the packet locally.
711 */
712 ifp = m->m_pkthdr.rcvif;
713 } else
714 #endif /* NBRIDGE > 0 */
715 {
716
717 #if NCARP > 0
718 if (ifp->if_carp && ifp->if_type != IFT_CARP &&
719 (carp_input(m, (u_int8_t *)&eh->ether_shost,
720 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0)) {
721 return;
722 }
723 #endif /* NCARP > 0 */
724 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
725 (ifp->if_flags & IFF_PROMISC) != 0 &&
726 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost,
727 ETHER_ADDR_LEN) != 0) {
728 m->m_flags |= M_PROMISC;
729 }
730 }
731
732 #ifdef PFIL_HOOKS
733 if ((m->m_flags & M_PROMISC) == 0) {
734 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
735 return;
736 if (m == NULL)
737 return;
738
739 eh = mtod(m, struct ether_header *);
740 etype = ntohs(eh->ether_type);
741 }
742 #endif
743
744 /*
745 * If VLANs are configured on the interface, check to
746 * see if the device performed the decapsulation and
747 * provided us with the tag.
748 */
749 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
750 #if NVLAN > 0
751 /*
752 * vlan_input() will either recursively call ether_input()
753 * or drop the packet.
754 */
755 vlan_input(ifp, m);
756 #else
757 m_freem(m);
758 #endif
759 return;
760 }
761
762 #if NAGR > 0
763 if (ifp->if_agrprivate &&
764 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
765 m->m_flags &= ~M_PROMISC;
766 agr_input(ifp, m);
767 return;
768 }
769 #endif /* NAGR > 0 */
770
771 /*
772 * Handle protocols that expect to have the Ethernet header
773 * (and possibly FCS) intact.
774 */
775 switch (etype) {
776 #if NVLAN > 0
777 case ETHERTYPE_VLAN:
778 /*
779 * vlan_input() will either recursively call ether_input()
780 * or drop the packet.
781 */
782 if (((struct ethercom *)ifp)->ec_nvlans != 0)
783 vlan_input(ifp, m);
784 else
785 m_freem(m);
786 return;
787 #endif /* NVLAN > 0 */
788 #if NPPPOE > 0
789 case ETHERTYPE_PPPOEDISC:
790 case ETHERTYPE_PPPOE:
791 if (m->m_flags & M_PROMISC) {
792 m_freem(m);
793 return;
794 }
795 #ifndef PPPOE_SERVER
796 if (m->m_flags & (M_MCAST | M_BCAST)) {
797 m_freem(m);
798 return;
799 }
800 #endif
801
802 if (etype == ETHERTYPE_PPPOEDISC)
803 inq = &ppoediscinq;
804 else
805 inq = &ppoeinq;
806 if (IF_QFULL(inq)) {
807 IF_DROP(inq);
808 m_freem(m);
809 } else
810 IF_ENQUEUE(inq, m);
811 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
812 if (!callout_pending(&pppoe_softintr))
813 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL);
814 #else
815 softintr_schedule(pppoe_softintr);
816 #endif
817 return;
818 #endif /* NPPPOE > 0 */
819 case ETHERTYPE_SLOWPROTOCOLS: {
820 uint8_t subtype;
821
822 #if defined(DIAGNOSTIC)
823 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
824 panic("ether_input: too short slow protocol packet");
825 }
826 #endif
827 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
828 switch (subtype) {
829 #if NAGR > 0
830 case SLOWPROTOCOLS_SUBTYPE_LACP:
831 if (ifp->if_agrprivate) {
832 ieee8023ad_lacp_input(ifp, m);
833 return;
834 }
835 break;
836
837 case SLOWPROTOCOLS_SUBTYPE_MARKER:
838 if (ifp->if_agrprivate) {
839 ieee8023ad_marker_input(ifp, m);
840 return;
841 }
842 break;
843 #endif /* NAGR > 0 */
844 default:
845 if (subtype == 0 || subtype > 10) {
846 /* illegal value */
847 m_freem(m);
848 return;
849 }
850 /* unknown subtype */
851 break;
852 }
853 /* FALLTHROUGH */
854 }
855 default:
856 if (m->m_flags & M_PROMISC) {
857 m_freem(m);
858 return;
859 }
860 }
861
862 /* Strip off the Ethernet header. */
863 m_adj(m, sizeof(struct ether_header));
864
865 /* If the CRC is still on the packet, trim it off. */
866 if (m->m_flags & M_HASFCS) {
867 m_adj(m, -ETHER_CRC_LEN);
868 m->m_flags &= ~M_HASFCS;
869 }
870
871 switch (etype) {
872 #ifdef INET
873 case ETHERTYPE_IP:
874 #ifdef GATEWAY
875 if (ipflow_fastforward(m))
876 return;
877 #endif
878 schednetisr(NETISR_IP);
879 inq = &ipintrq;
880 break;
881
882 case ETHERTYPE_ARP:
883 schednetisr(NETISR_ARP);
884 inq = &arpintrq;
885 break;
886
887 case ETHERTYPE_REVARP:
888 revarpinput(m); /* XXX queue? */
889 return;
890 #endif
891 #ifdef INET6
892 case ETHERTYPE_IPV6:
893 schednetisr(NETISR_IPV6);
894 inq = &ip6intrq;
895 break;
896 #endif
897 #ifdef IPX
898 case ETHERTYPE_IPX:
899 schednetisr(NETISR_IPX);
900 inq = &ipxintrq;
901 break;
902 #endif
903 #ifdef NETATALK
904 case ETHERTYPE_ATALK:
905 schednetisr(NETISR_ATALK);
906 inq = &atintrq1;
907 break;
908 case ETHERTYPE_AARP:
909 /* probably this should be done with a NETISR as well */
910 aarpinput(ifp, m); /* XXX */
911 return;
912 #endif /* NETATALK */
913 default:
914 #if defined (ISO) || defined (LLC) || defined (NETATALK)
915 if (etype > ETHERMTU)
916 goto dropanyway;
917 l = mtod(m, struct llc *);
918 switch (l->llc_dsap) {
919 #ifdef NETATALK
920 case LLC_SNAP_LSAP:
921 switch (l->llc_control) {
922 case LLC_UI:
923 if (l->llc_ssap != LLC_SNAP_LSAP) {
924 goto dropanyway;
925 }
926
927 if (Bcmp(&(l->llc_snap_org_code)[0],
928 at_org_code, sizeof(at_org_code)) == 0 &&
929 ntohs(l->llc_snap_ether_type) ==
930 ETHERTYPE_ATALK) {
931 inq = &atintrq2;
932 m_adj(m, sizeof(struct llc));
933 schednetisr(NETISR_ATALK);
934 break;
935 }
936
937 if (Bcmp(&(l->llc_snap_org_code)[0],
938 aarp_org_code,
939 sizeof(aarp_org_code)) == 0 &&
940 ntohs(l->llc_snap_ether_type) ==
941 ETHERTYPE_AARP) {
942 m_adj( m, sizeof(struct llc));
943 aarpinput(ifp, m); /* XXX */
944 return;
945 }
946
947 default:
948 goto dropanyway;
949 }
950 break;
951 #endif /* NETATALK */
952 #ifdef ISO
953 case LLC_ISO_LSAP:
954 switch (l->llc_control) {
955 case LLC_UI:
956 /* LLC_UI_P forbidden in class 1 service */
957 if ((l->llc_dsap == LLC_ISO_LSAP) &&
958 (l->llc_ssap == LLC_ISO_LSAP)) {
959 /* LSAP for ISO */
960 if (m->m_pkthdr.len > etype)
961 m_adj(m, etype - m->m_pkthdr.len);
962 m->m_data += 3; /* XXX */
963 m->m_len -= 3; /* XXX */
964 m->m_pkthdr.len -= 3; /* XXX */
965 M_PREPEND(m, sizeof *eh, M_DONTWAIT);
966 if (m == 0)
967 return;
968 *mtod(m, struct ether_header *) = *eh;
969 #ifdef ARGO_DEBUG
970 if (argo_debug[D_ETHER])
971 printf("clnp packet");
972 #endif
973 schednetisr(NETISR_ISO);
974 inq = &clnlintrq;
975 break;
976 }
977 goto dropanyway;
978
979 case LLC_XID:
980 case LLC_XID_P:
981 if(m->m_len < 6)
982 goto dropanyway;
983 l->llc_window = 0;
984 l->llc_fid = 9;
985 l->llc_class = 1;
986 l->llc_dsap = l->llc_ssap = 0;
987 /* Fall through to */
988 case LLC_TEST:
989 case LLC_TEST_P:
990 {
991 struct sockaddr sa;
992 struct ether_header *eh2;
993 int i;
994 u_char c = l->llc_dsap;
995
996 l->llc_dsap = l->llc_ssap;
997 l->llc_ssap = c;
998 if (m->m_flags & (M_BCAST | M_MCAST))
999 bcopy(LLADDR(ifp->if_sadl),
1000 (caddr_t)eh->ether_dhost, 6);
1001 sa.sa_family = AF_UNSPEC;
1002 sa.sa_len = sizeof(sa);
1003 eh2 = (struct ether_header *)sa.sa_data;
1004 for (i = 0; i < 6; i++) {
1005 eh2->ether_shost[i] = c =
1006 eh->ether_dhost[i];
1007 eh2->ether_dhost[i] =
1008 eh->ether_dhost[i] =
1009 eh->ether_shost[i];
1010 eh->ether_shost[i] = c;
1011 }
1012 ifp->if_output(ifp, m, &sa, NULL);
1013 return;
1014 }
1015 default:
1016 m_freem(m);
1017 return;
1018 }
1019 break;
1020 #endif /* ISO */
1021 dropanyway:
1022 default:
1023 m_freem(m);
1024 return;
1025 }
1026 #else /* ISO || LLC || NETATALK*/
1027 m_freem(m);
1028 return;
1029 #endif /* ISO || LLC || NETATALK*/
1030 }
1031
1032 if (IF_QFULL(inq)) {
1033 IF_DROP(inq);
1034 m_freem(m);
1035 } else
1036 IF_ENQUEUE(inq, m);
1037 }
1038
1039 /*
1040 * Convert Ethernet address to printable (loggable) representation.
1041 */
1042 char *
1043 ether_sprintf(const u_char *ap)
1044 {
1045 static char etherbuf[3 * ETHER_ADDR_LEN];
1046 return ether_snprintf(etherbuf, sizeof(etherbuf), ap);
1047 return etherbuf;
1048 }
1049
1050 char *
1051 ether_snprintf(char *buf, size_t len, const u_char *ap)
1052 {
1053 char *cp = buf;
1054 size_t i;
1055
1056 for (i = 0; i < len / 3; i++) {
1057 *cp++ = hexdigits[*ap >> 4];
1058 *cp++ = hexdigits[*ap++ & 0xf];
1059 *cp++ = ':';
1060 }
1061 *--cp = '\0';
1062 return buf;
1063 }
1064
1065 /*
1066 * Perform common duties while attaching to interface list
1067 */
1068 void
1069 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
1070 {
1071 struct ethercom *ec = (struct ethercom *)ifp;
1072
1073 ifp->if_type = IFT_ETHER;
1074 ifp->if_addrlen = ETHER_ADDR_LEN;
1075 ifp->if_hdrlen = ETHER_HDR_LEN;
1076 ifp->if_dlt = DLT_EN10MB;
1077 ifp->if_mtu = ETHERMTU;
1078 ifp->if_output = ether_output;
1079 ifp->if_input = ether_input;
1080 if (ifp->if_baudrate == 0)
1081 ifp->if_baudrate = IF_Mbps(10); /* just a default */
1082
1083 if_alloc_sadl(ifp);
1084 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
1085
1086 LIST_INIT(&ec->ec_multiaddrs);
1087 ifp->if_broadcastaddr = etherbroadcastaddr;
1088 #if NBPFILTER > 0
1089 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
1090 #endif
1091 #ifdef MBUFTRACE
1092 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname,
1093 sizeof(ec->ec_tx_mowner.mo_name));
1094 strlcpy(ec->ec_tx_mowner.mo_descr, "tx",
1095 sizeof(ec->ec_tx_mowner.mo_descr));
1096 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname,
1097 sizeof(ec->ec_rx_mowner.mo_name));
1098 strlcpy(ec->ec_rx_mowner.mo_descr, "rx",
1099 sizeof(ec->ec_rx_mowner.mo_descr));
1100 MOWNER_ATTACH(&ec->ec_tx_mowner);
1101 MOWNER_ATTACH(&ec->ec_rx_mowner);
1102 ifp->if_mowner = &ec->ec_tx_mowner;
1103 #endif
1104 }
1105
1106 void
1107 ether_ifdetach(struct ifnet *ifp)
1108 {
1109 struct ethercom *ec = (void *) ifp;
1110 struct ether_multi *enm;
1111 int s;
1112
1113 #if NBRIDGE > 0
1114 if (ifp->if_bridge)
1115 bridge_ifdetach(ifp);
1116 #endif
1117
1118 #if NBPFILTER > 0
1119 bpfdetach(ifp);
1120 #endif
1121
1122 #if NVLAN > 0
1123 if (ec->ec_nvlans)
1124 vlan_ifdetach(ifp);
1125 #endif
1126
1127 s = splnet();
1128 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
1129 LIST_REMOVE(enm, enm_list);
1130 free(enm, M_IFMADDR);
1131 ec->ec_multicnt--;
1132 }
1133 splx(s);
1134
1135 #if 0 /* done in if_detach() */
1136 if_free_sadl(ifp);
1137 #endif
1138
1139 MOWNER_DETACH(&ec->ec_rx_mowner);
1140 MOWNER_DETACH(&ec->ec_tx_mowner);
1141 }
1142
1143 #if 0
1144 /*
1145 * This is for reference. We have a table-driven version
1146 * of the little-endian crc32 generator, which is faster
1147 * than the double-loop.
1148 */
1149 u_int32_t
1150 ether_crc32_le(const u_int8_t *buf, size_t len)
1151 {
1152 u_int32_t c, crc, carry;
1153 size_t i, j;
1154
1155 crc = 0xffffffffU; /* initial value */
1156
1157 for (i = 0; i < len; i++) {
1158 c = buf[i];
1159 for (j = 0; j < 8; j++) {
1160 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1161 crc >>= 1;
1162 c >>= 1;
1163 if (carry)
1164 crc = (crc ^ ETHER_CRC_POLY_LE);
1165 }
1166 }
1167
1168 return (crc);
1169 }
1170 #else
1171 u_int32_t
1172 ether_crc32_le(const u_int8_t *buf, size_t len)
1173 {
1174 static const u_int32_t crctab[] = {
1175 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1176 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1177 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1178 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1179 };
1180 u_int32_t crc;
1181 size_t i;
1182
1183 crc = 0xffffffffU; /* initial value */
1184
1185 for (i = 0; i < len; i++) {
1186 crc ^= buf[i];
1187 crc = (crc >> 4) ^ crctab[crc & 0xf];
1188 crc = (crc >> 4) ^ crctab[crc & 0xf];
1189 }
1190
1191 return (crc);
1192 }
1193 #endif
1194
1195 u_int32_t
1196 ether_crc32_be(const u_int8_t *buf, size_t len)
1197 {
1198 u_int32_t c, crc, carry;
1199 size_t i, j;
1200
1201 crc = 0xffffffffU; /* initial value */
1202
1203 for (i = 0; i < len; i++) {
1204 c = buf[i];
1205 for (j = 0; j < 8; j++) {
1206 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1207 crc <<= 1;
1208 c >>= 1;
1209 if (carry)
1210 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1211 }
1212 }
1213
1214 return (crc);
1215 }
1216
1217 #ifdef INET
1218 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] =
1219 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
1220 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] =
1221 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
1222 #endif
1223 #ifdef INET6
1224 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] =
1225 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
1226 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] =
1227 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
1228 #endif
1229
1230 /*
1231 * Convert a sockaddr into an Ethernet address or range of Ethernet
1232 * addresses.
1233 */
1234 int
1235 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN],
1236 u_int8_t addrhi[ETHER_ADDR_LEN])
1237 {
1238 #ifdef INET
1239 struct sockaddr_in *sin;
1240 #endif /* INET */
1241 #ifdef INET6
1242 struct sockaddr_in6 *sin6;
1243 #endif /* INET6 */
1244
1245 switch (sa->sa_family) {
1246
1247 case AF_UNSPEC:
1248 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN);
1249 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1250 break;
1251
1252 #ifdef INET
1253 case AF_INET:
1254 sin = satosin(sa);
1255 if (sin->sin_addr.s_addr == INADDR_ANY) {
1256 /*
1257 * An IP address of INADDR_ANY means listen to
1258 * or stop listening to all of the Ethernet
1259 * multicast addresses used for IP.
1260 * (This is for the sake of IP multicast routers.)
1261 */
1262 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN);
1263 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN);
1264 }
1265 else {
1266 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
1267 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1268 }
1269 break;
1270 #endif
1271 #ifdef INET6
1272 case AF_INET6:
1273 sin6 = satosin6(sa);
1274 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1275 /*
1276 * An IP6 address of 0 means listen to or stop
1277 * listening to all of the Ethernet multicast
1278 * address used for IP6.
1279 * (This is used for multicast routers.)
1280 */
1281 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN);
1282 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN);
1283 } else {
1284 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
1285 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1286 }
1287 break;
1288 #endif
1289
1290 default:
1291 return (EAFNOSUPPORT);
1292 }
1293 return (0);
1294 }
1295
1296 /*
1297 * Add an Ethernet multicast address or range of addresses to the list for a
1298 * given interface.
1299 */
1300 int
1301 ether_addmulti(struct ifreq *ifr, struct ethercom *ec)
1302 {
1303 struct ether_multi *enm;
1304 u_char addrlo[ETHER_ADDR_LEN];
1305 u_char addrhi[ETHER_ADDR_LEN];
1306 int s = splnet(), error;
1307
1308 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
1309 if (error != 0) {
1310 splx(s);
1311 return (error);
1312 }
1313
1314 /*
1315 * Verify that we have valid Ethernet multicast addresses.
1316 */
1317 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
1318 splx(s);
1319 return (EINVAL);
1320 }
1321 /*
1322 * See if the address range is already in the list.
1323 */
1324 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1325 if (enm != NULL) {
1326 /*
1327 * Found it; just increment the reference count.
1328 */
1329 ++enm->enm_refcount;
1330 splx(s);
1331 return (0);
1332 }
1333 /*
1334 * New address or range; malloc a new multicast record
1335 * and link it into the interface's multicast list.
1336 */
1337 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
1338 if (enm == NULL) {
1339 splx(s);
1340 return (ENOBUFS);
1341 }
1342 bcopy(addrlo, enm->enm_addrlo, 6);
1343 bcopy(addrhi, enm->enm_addrhi, 6);
1344 enm->enm_refcount = 1;
1345 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
1346 ec->ec_multicnt++;
1347 splx(s);
1348 /*
1349 * Return ENETRESET to inform the driver that the list has changed
1350 * and its reception filter should be adjusted accordingly.
1351 */
1352 return (ENETRESET);
1353 }
1354
1355 /*
1356 * Delete a multicast address record.
1357 */
1358 int
1359 ether_delmulti(struct ifreq *ifr, struct ethercom *ec)
1360 {
1361 struct ether_multi *enm;
1362 u_char addrlo[ETHER_ADDR_LEN];
1363 u_char addrhi[ETHER_ADDR_LEN];
1364 int s = splnet(), error;
1365
1366 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
1367 if (error != 0) {
1368 splx(s);
1369 return (error);
1370 }
1371
1372 /*
1373 * Look ur the address in our list.
1374 */
1375 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1376 if (enm == NULL) {
1377 splx(s);
1378 return (ENXIO);
1379 }
1380 if (--enm->enm_refcount != 0) {
1381 /*
1382 * Still some claims to this record.
1383 */
1384 splx(s);
1385 return (0);
1386 }
1387 /*
1388 * No remaining claims to this record; unlink and free it.
1389 */
1390 LIST_REMOVE(enm, enm_list);
1391 free(enm, M_IFMADDR);
1392 ec->ec_multicnt--;
1393 splx(s);
1394 /*
1395 * Return ENETRESET to inform the driver that the list has changed
1396 * and its reception filter should be adjusted accordingly.
1397 */
1398 return (ENETRESET);
1399 }
1400
1401 /*
1402 * Common ioctls for Ethernet interfaces. Note, we must be
1403 * called at splnet().
1404 */
1405 int
1406 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1407 {
1408 struct ethercom *ec = (void *) ifp;
1409 struct ifreq *ifr = (struct ifreq *)data;
1410 struct ifaddr *ifa = (struct ifaddr *)data;
1411 int error = 0;
1412
1413 switch (cmd) {
1414 case SIOCSIFADDR:
1415 ifp->if_flags |= IFF_UP;
1416 switch (ifa->ifa_addr->sa_family) {
1417 case AF_LINK:
1418 {
1419 struct sockaddr_dl *sdl =
1420 (struct sockaddr_dl *) ifa->ifa_addr;
1421
1422 if (sdl->sdl_type != IFT_ETHER ||
1423 sdl->sdl_alen != ifp->if_addrlen) {
1424 error = EINVAL;
1425 break;
1426 }
1427
1428 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl),
1429 ifp->if_addrlen);
1430
1431 /* Set new address. */
1432 error = (*ifp->if_init)(ifp);
1433 break;
1434 }
1435 #ifdef INET
1436 case AF_INET:
1437 if ((ifp->if_flags & IFF_RUNNING) == 0 &&
1438 (error = (*ifp->if_init)(ifp)) != 0)
1439 break;
1440 arp_ifinit(ifp, ifa);
1441 break;
1442 #endif /* INET */
1443 default:
1444 if ((ifp->if_flags & IFF_RUNNING) == 0)
1445 error = (*ifp->if_init)(ifp);
1446 break;
1447 }
1448 break;
1449
1450 case SIOCGIFADDR:
1451 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data,
1452 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN);
1453 break;
1454
1455 case SIOCSIFMTU:
1456 {
1457 int maxmtu;
1458
1459 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
1460 maxmtu = ETHERMTU_JUMBO;
1461 else
1462 maxmtu = ETHERMTU;
1463
1464 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
1465 error = EINVAL;
1466 else {
1467 ifp->if_mtu = ifr->ifr_mtu;
1468
1469 /* Make sure the device notices the MTU change. */
1470 if (ifp->if_flags & IFF_UP)
1471 error = (*ifp->if_init)(ifp);
1472 }
1473 break;
1474 }
1475
1476 case SIOCSIFFLAGS:
1477 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
1478 /*
1479 * If interface is marked down and it is running,
1480 * then stop and disable it.
1481 */
1482 (*ifp->if_stop)(ifp, 1);
1483 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
1484 /*
1485 * If interface is marked up and it is stopped, then
1486 * start it.
1487 */
1488 error = (*ifp->if_init)(ifp);
1489 } else if ((ifp->if_flags & IFF_UP) != 0) {
1490 /*
1491 * Reset the interface to pick up changes in any other
1492 * flags that affect the hardware state.
1493 */
1494 error = (*ifp->if_init)(ifp);
1495 }
1496 break;
1497
1498 case SIOCADDMULTI:
1499 error = ether_addmulti(ifr, ec);
1500 break;
1501
1502 case SIOCDELMULTI:
1503 error = ether_delmulti(ifr, ec);
1504 break;
1505
1506 default:
1507 error = ENOTTY;
1508 }
1509
1510 return (error);
1511 }
1512