1 /* $NetBSD: if_ethersubr.c,v 1.139.2.2 2007/02/27 23:16:42 riz 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 1.139.2.2 2007/02/27 23:16:42 riz 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 /*
720 * clear M_PROMISC, in case the packets comes from a
721 * vlan
722 */
723 m->m_flags &= ~M_PROMISC;
724 if (carp_input(m, (u_int8_t *)&eh->ether_shost,
725 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0)
726 return;
727 }
728 #endif /* NCARP > 0 */
729 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
730 (ifp->if_flags & IFF_PROMISC) != 0 &&
731 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost,
732 ETHER_ADDR_LEN) != 0) {
733 m->m_flags |= M_PROMISC;
734 }
735 }
736
737 #ifdef PFIL_HOOKS
738 if ((m->m_flags & M_PROMISC) == 0) {
739 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0)
740 return;
741 if (m == NULL)
742 return;
743
744 eh = mtod(m, struct ether_header *);
745 etype = ntohs(eh->ether_type);
746 }
747 #endif
748
749 /*
750 * If VLANs are configured on the interface, check to
751 * see if the device performed the decapsulation and
752 * provided us with the tag.
753 */
754 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) {
755 #if NVLAN > 0
756 /*
757 * vlan_input() will either recursively call ether_input()
758 * or drop the packet.
759 */
760 vlan_input(ifp, m);
761 #else
762 m_freem(m);
763 #endif
764 return;
765 }
766
767 #if NAGR > 0
768 if (ifp->if_agrprivate &&
769 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) {
770 m->m_flags &= ~M_PROMISC;
771 agr_input(ifp, m);
772 return;
773 }
774 #endif /* NAGR > 0 */
775
776 /*
777 * Handle protocols that expect to have the Ethernet header
778 * (and possibly FCS) intact.
779 */
780 switch (etype) {
781 #if NVLAN > 0
782 case ETHERTYPE_VLAN:
783 /*
784 * vlan_input() will either recursively call ether_input()
785 * or drop the packet.
786 */
787 if (((struct ethercom *)ifp)->ec_nvlans != 0)
788 vlan_input(ifp, m);
789 else
790 m_freem(m);
791 return;
792 #endif /* NVLAN > 0 */
793 #if NPPPOE > 0
794 case ETHERTYPE_PPPOEDISC:
795 case ETHERTYPE_PPPOE:
796 if (m->m_flags & M_PROMISC) {
797 m_freem(m);
798 return;
799 }
800 #ifndef PPPOE_SERVER
801 if (m->m_flags & (M_MCAST | M_BCAST)) {
802 m_freem(m);
803 return;
804 }
805 #endif
806
807 if (etype == ETHERTYPE_PPPOEDISC)
808 inq = &ppoediscinq;
809 else
810 inq = &ppoeinq;
811 if (IF_QFULL(inq)) {
812 IF_DROP(inq);
813 m_freem(m);
814 } else
815 IF_ENQUEUE(inq, m);
816 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS
817 if (!callout_pending(&pppoe_softintr))
818 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL);
819 #else
820 softintr_schedule(pppoe_softintr);
821 #endif
822 return;
823 #endif /* NPPPOE > 0 */
824 case ETHERTYPE_SLOWPROTOCOLS: {
825 uint8_t subtype;
826
827 #if defined(DIAGNOSTIC)
828 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) {
829 panic("ether_input: too short slow protocol packet");
830 }
831 #endif
832 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype);
833 switch (subtype) {
834 #if NAGR > 0
835 case SLOWPROTOCOLS_SUBTYPE_LACP:
836 if (ifp->if_agrprivate) {
837 ieee8023ad_lacp_input(ifp, m);
838 return;
839 }
840 break;
841
842 case SLOWPROTOCOLS_SUBTYPE_MARKER:
843 if (ifp->if_agrprivate) {
844 ieee8023ad_marker_input(ifp, m);
845 return;
846 }
847 break;
848 #endif /* NAGR > 0 */
849 default:
850 if (subtype == 0 || subtype > 10) {
851 /* illegal value */
852 m_freem(m);
853 return;
854 }
855 /* unknown subtype */
856 break;
857 }
858 /* FALLTHROUGH */
859 }
860 default:
861 if (m->m_flags & M_PROMISC) {
862 m_freem(m);
863 return;
864 }
865 }
866
867 /* If the CRC is still on the packet, trim it off. */
868 if (m->m_flags & M_HASFCS) {
869 m_adj(m, -ETHER_CRC_LEN);
870 m->m_flags &= ~M_HASFCS;
871 }
872
873 if (etype > ETHERMTU + sizeof (struct ether_header)) {
874 /* Strip off the Ethernet header. */
875 m_adj(m, sizeof(struct ether_header));
876
877 switch (etype) {
878 #ifdef INET
879 case ETHERTYPE_IP:
880 #ifdef GATEWAY
881 if (ipflow_fastforward(m))
882 return;
883 #endif
884 schednetisr(NETISR_IP);
885 inq = &ipintrq;
886 break;
887
888 case ETHERTYPE_ARP:
889 schednetisr(NETISR_ARP);
890 inq = &arpintrq;
891 break;
892
893 case ETHERTYPE_REVARP:
894 revarpinput(m); /* XXX queue? */
895 return;
896 #endif
897 #ifdef INET6
898 case ETHERTYPE_IPV6:
899 schednetisr(NETISR_IPV6);
900 inq = &ip6intrq;
901 break;
902 #endif
903 #ifdef IPX
904 case ETHERTYPE_IPX:
905 schednetisr(NETISR_IPX);
906 inq = &ipxintrq;
907 break;
908 #endif
909 #ifdef NETATALK
910 case ETHERTYPE_ATALK:
911 schednetisr(NETISR_ATALK);
912 inq = &atintrq1;
913 break;
914 case ETHERTYPE_AARP:
915 /* probably this should be done with a NETISR as well */
916 aarpinput(ifp, m); /* XXX */
917 return;
918 #endif /* NETATALK */
919 default:
920 m_freem(m);
921 return;
922 }
923 } else {
924 #if defined (ISO) || defined (LLC) || defined (NETATALK)
925 l = (struct llc *)(eh+1);
926 switch (l->llc_dsap) {
927 #ifdef NETATALK
928 case LLC_SNAP_LSAP:
929 switch (l->llc_control) {
930 case LLC_UI:
931 if (l->llc_ssap != LLC_SNAP_LSAP) {
932 goto dropanyway;
933 }
934
935 if (Bcmp(&(l->llc_snap_org_code)[0],
936 at_org_code, sizeof(at_org_code)) == 0 &&
937 ntohs(l->llc_snap_ether_type) ==
938 ETHERTYPE_ATALK) {
939 inq = &atintrq2;
940 m_adj(m, sizeof(struct ether_header)
941 + sizeof(struct llc));
942 schednetisr(NETISR_ATALK);
943 break;
944 }
945
946 if (Bcmp(&(l->llc_snap_org_code)[0],
947 aarp_org_code,
948 sizeof(aarp_org_code)) == 0 &&
949 ntohs(l->llc_snap_ether_type) ==
950 ETHERTYPE_AARP) {
951 m_adj( m, sizeof(struct ether_header)
952 + sizeof(struct llc));
953 aarpinput(ifp, m); /* XXX */
954 return;
955 }
956
957 default:
958 goto dropanyway;
959 }
960 break;
961 #endif /* NETATALK */
962 #ifdef ISO
963 case LLC_ISO_LSAP:
964 switch (l->llc_control) {
965 case LLC_UI:
966 /* LLC_UI_P forbidden in class 1 service */
967 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */
968 (l->llc_ssap == LLC_ISO_LSAP)) {
969 /* LSAP for ISO */
970 /* XXX length computation?? */
971 if (m->m_pkthdr.len > etype + sizeof(struct ether_header))
972 m_adj(m, etype - m->m_pkthdr.len);
973
974 #ifdef ARGO_DEBUG
975 if (argo_debug[D_ETHER])
976 printf("clnp packet");
977 #endif
978 schednetisr(NETISR_ISO);
979 inq = &clnlintrq;
980 break;
981 }
982 goto dropanyway;
983
984 case LLC_XID:
985 case LLC_XID_P:
986 if(m->m_len < 6 + sizeof(struct ether_header))
987 /* XXX m_pullup? */
988 goto dropanyway;
989 l->llc_window = 0;
990 l->llc_fid = 9;
991 l->llc_class = 1;
992 l->llc_dsap = l->llc_ssap = 0;
993 /* Fall through to */
994 case LLC_TEST:
995 case LLC_TEST_P:
996 {
997 struct sockaddr sa;
998 struct ether_header *eh2;
999 int i;
1000 u_char c = l->llc_dsap;
1001
1002 l->llc_dsap = l->llc_ssap;
1003 l->llc_ssap = c;
1004 m_adj(m, sizeof(struct ether_header));
1005 /* XXX we can optimize here? */
1006 if (m->m_flags & (M_BCAST | M_MCAST))
1007 bcopy(LLADDR(ifp->if_sadl),
1008 (caddr_t)eh->ether_dhost, 6);
1009 sa.sa_family = AF_UNSPEC;
1010 sa.sa_len = sizeof(sa);
1011 eh2 = (struct ether_header *)sa.sa_data;
1012 for (i = 0; i < 6; i++) {
1013 eh2->ether_shost[i] = c =
1014 eh->ether_dhost[i];
1015 eh2->ether_dhost[i] =
1016 eh->ether_dhost[i] =
1017 eh->ether_shost[i];
1018 eh->ether_shost[i] = c;
1019 }
1020 ifp->if_output(ifp, m, &sa, NULL);
1021 return;
1022 }
1023 default:
1024 m_freem(m);
1025 return;
1026 }
1027 break;
1028 #endif /* ISO */
1029 #if defined (ISO) || defined (NETATALK)
1030 dropanyway:
1031 #endif
1032 default:
1033 m_freem(m);
1034 return;
1035 }
1036 #else /* ISO || LLC || NETATALK*/
1037 m_freem(m);
1038 return;
1039 #endif /* ISO || LLC || NETATALK*/
1040 }
1041
1042 if (IF_QFULL(inq)) {
1043 IF_DROP(inq);
1044 m_freem(m);
1045 } else
1046 IF_ENQUEUE(inq, m);
1047 }
1048
1049 /*
1050 * Convert Ethernet address to printable (loggable) representation.
1051 */
1052 char *
1053 ether_sprintf(const u_char *ap)
1054 {
1055 static char etherbuf[3 * ETHER_ADDR_LEN];
1056 return ether_snprintf(etherbuf, sizeof(etherbuf), ap);
1057 return etherbuf;
1058 }
1059
1060 char *
1061 ether_snprintf(char *buf, size_t len, const u_char *ap)
1062 {
1063 char *cp = buf;
1064 size_t i;
1065
1066 for (i = 0; i < len / 3; i++) {
1067 *cp++ = hexdigits[*ap >> 4];
1068 *cp++ = hexdigits[*ap++ & 0xf];
1069 *cp++ = ':';
1070 }
1071 *--cp = '\0';
1072 return buf;
1073 }
1074
1075 /*
1076 * Perform common duties while attaching to interface list
1077 */
1078 void
1079 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
1080 {
1081 struct ethercom *ec = (struct ethercom *)ifp;
1082
1083 ifp->if_type = IFT_ETHER;
1084 ifp->if_addrlen = ETHER_ADDR_LEN;
1085 ifp->if_hdrlen = ETHER_HDR_LEN;
1086 ifp->if_dlt = DLT_EN10MB;
1087 ifp->if_mtu = ETHERMTU;
1088 ifp->if_output = ether_output;
1089 ifp->if_input = ether_input;
1090 if (ifp->if_baudrate == 0)
1091 ifp->if_baudrate = IF_Mbps(10); /* just a default */
1092
1093 if_alloc_sadl(ifp);
1094 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen);
1095
1096 LIST_INIT(&ec->ec_multiaddrs);
1097 ifp->if_broadcastaddr = etherbroadcastaddr;
1098 #if NBPFILTER > 0
1099 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
1100 #endif
1101 #ifdef MBUFTRACE
1102 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname,
1103 sizeof(ec->ec_tx_mowner.mo_name));
1104 strlcpy(ec->ec_tx_mowner.mo_descr, "tx",
1105 sizeof(ec->ec_tx_mowner.mo_descr));
1106 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname,
1107 sizeof(ec->ec_rx_mowner.mo_name));
1108 strlcpy(ec->ec_rx_mowner.mo_descr, "rx",
1109 sizeof(ec->ec_rx_mowner.mo_descr));
1110 MOWNER_ATTACH(&ec->ec_tx_mowner);
1111 MOWNER_ATTACH(&ec->ec_rx_mowner);
1112 ifp->if_mowner = &ec->ec_tx_mowner;
1113 #endif
1114 }
1115
1116 void
1117 ether_ifdetach(struct ifnet *ifp)
1118 {
1119 struct ethercom *ec = (void *) ifp;
1120 struct ether_multi *enm;
1121 int s;
1122
1123 #if NBRIDGE > 0
1124 if (ifp->if_bridge)
1125 bridge_ifdetach(ifp);
1126 #endif
1127
1128 #if NBPFILTER > 0
1129 bpfdetach(ifp);
1130 #endif
1131
1132 #if NVLAN > 0
1133 if (ec->ec_nvlans)
1134 vlan_ifdetach(ifp);
1135 #endif
1136
1137 s = splnet();
1138 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) {
1139 LIST_REMOVE(enm, enm_list);
1140 free(enm, M_IFMADDR);
1141 ec->ec_multicnt--;
1142 }
1143 splx(s);
1144
1145 #if 0 /* done in if_detach() */
1146 if_free_sadl(ifp);
1147 #endif
1148
1149 MOWNER_DETACH(&ec->ec_rx_mowner);
1150 MOWNER_DETACH(&ec->ec_tx_mowner);
1151 }
1152
1153 #if 0
1154 /*
1155 * This is for reference. We have a table-driven version
1156 * of the little-endian crc32 generator, which is faster
1157 * than the double-loop.
1158 */
1159 u_int32_t
1160 ether_crc32_le(const u_int8_t *buf, size_t len)
1161 {
1162 u_int32_t c, crc, carry;
1163 size_t i, j;
1164
1165 crc = 0xffffffffU; /* initial value */
1166
1167 for (i = 0; i < len; i++) {
1168 c = buf[i];
1169 for (j = 0; j < 8; j++) {
1170 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
1171 crc >>= 1;
1172 c >>= 1;
1173 if (carry)
1174 crc = (crc ^ ETHER_CRC_POLY_LE);
1175 }
1176 }
1177
1178 return (crc);
1179 }
1180 #else
1181 u_int32_t
1182 ether_crc32_le(const u_int8_t *buf, size_t len)
1183 {
1184 static const u_int32_t crctab[] = {
1185 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
1186 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
1187 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
1188 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
1189 };
1190 u_int32_t crc;
1191 size_t i;
1192
1193 crc = 0xffffffffU; /* initial value */
1194
1195 for (i = 0; i < len; i++) {
1196 crc ^= buf[i];
1197 crc = (crc >> 4) ^ crctab[crc & 0xf];
1198 crc = (crc >> 4) ^ crctab[crc & 0xf];
1199 }
1200
1201 return (crc);
1202 }
1203 #endif
1204
1205 u_int32_t
1206 ether_crc32_be(const u_int8_t *buf, size_t len)
1207 {
1208 u_int32_t c, crc, carry;
1209 size_t i, j;
1210
1211 crc = 0xffffffffU; /* initial value */
1212
1213 for (i = 0; i < len; i++) {
1214 c = buf[i];
1215 for (j = 0; j < 8; j++) {
1216 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
1217 crc <<= 1;
1218 c >>= 1;
1219 if (carry)
1220 crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
1221 }
1222 }
1223
1224 return (crc);
1225 }
1226
1227 #ifdef INET
1228 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] =
1229 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
1230 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] =
1231 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
1232 #endif
1233 #ifdef INET6
1234 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] =
1235 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
1236 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] =
1237 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
1238 #endif
1239
1240 /*
1241 * ether_aton implementation, not using a static buffer.
1242 */
1243 int
1244 ether_nonstatic_aton(u_char *dest, char *str)
1245 {
1246 int i;
1247 char *cp = str;
1248 u_char val[6];
1249
1250 #define set_value \
1251 if (*cp > '9' && *cp < 'a') \
1252 *cp -= 'A' - 10; \
1253 else if (*cp > '9') \
1254 *cp -= 'a' - 10; \
1255 else \
1256 *cp -= ''
1257
1258 for (i = 0; i < 6; i++, cp++) {
1259 if (!isxdigit(*cp))
1260 return (1);
1261 set_value;
1262 val[i] = *cp++;
1263 if (isxdigit(*cp)) {
1264 set_value;
1265 val[i] *= 16;
1266 val[i] += *cp++;
1267 }
1268 if (*cp == ':' || i == 5)
1269 continue;
1270 else
1271 return 1;
1272 }
1273 memcpy(dest, val, 6);
1274
1275 return 0;
1276 }
1277
1278
1279 /*
1280 * Convert a sockaddr into an Ethernet address or range of Ethernet
1281 * addresses.
1282 */
1283 int
1284 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN],
1285 u_int8_t addrhi[ETHER_ADDR_LEN])
1286 {
1287 #ifdef INET
1288 struct sockaddr_in *sin;
1289 #endif /* INET */
1290 #ifdef INET6
1291 struct sockaddr_in6 *sin6;
1292 #endif /* INET6 */
1293
1294 switch (sa->sa_family) {
1295
1296 case AF_UNSPEC:
1297 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN);
1298 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1299 break;
1300
1301 #ifdef INET
1302 case AF_INET:
1303 sin = satosin(sa);
1304 if (sin->sin_addr.s_addr == INADDR_ANY) {
1305 /*
1306 * An IP address of INADDR_ANY means listen to
1307 * or stop listening to all of the Ethernet
1308 * multicast addresses used for IP.
1309 * (This is for the sake of IP multicast routers.)
1310 */
1311 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN);
1312 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN);
1313 }
1314 else {
1315 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
1316 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1317 }
1318 break;
1319 #endif
1320 #ifdef INET6
1321 case AF_INET6:
1322 sin6 = satosin6(sa);
1323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
1324 /*
1325 * An IP6 address of 0 means listen to or stop
1326 * listening to all of the Ethernet multicast
1327 * address used for IP6.
1328 * (This is used for multicast routers.)
1329 */
1330 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN);
1331 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN);
1332 } else {
1333 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
1334 bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
1335 }
1336 break;
1337 #endif
1338
1339 default:
1340 return (EAFNOSUPPORT);
1341 }
1342 return (0);
1343 }
1344
1345 /*
1346 * Add an Ethernet multicast address or range of addresses to the list for a
1347 * given interface.
1348 */
1349 int
1350 ether_addmulti(struct ifreq *ifr, struct ethercom *ec)
1351 {
1352 struct ether_multi *enm;
1353 u_char addrlo[ETHER_ADDR_LEN];
1354 u_char addrhi[ETHER_ADDR_LEN];
1355 int s = splnet(), error;
1356
1357 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
1358 if (error != 0) {
1359 splx(s);
1360 return (error);
1361 }
1362
1363 /*
1364 * Verify that we have valid Ethernet multicast addresses.
1365 */
1366 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
1367 splx(s);
1368 return (EINVAL);
1369 }
1370 /*
1371 * See if the address range is already in the list.
1372 */
1373 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1374 if (enm != NULL) {
1375 /*
1376 * Found it; just increment the reference count.
1377 */
1378 ++enm->enm_refcount;
1379 splx(s);
1380 return (0);
1381 }
1382 /*
1383 * New address or range; malloc a new multicast record
1384 * and link it into the interface's multicast list.
1385 */
1386 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
1387 if (enm == NULL) {
1388 splx(s);
1389 return (ENOBUFS);
1390 }
1391 bcopy(addrlo, enm->enm_addrlo, 6);
1392 bcopy(addrhi, enm->enm_addrhi, 6);
1393 enm->enm_refcount = 1;
1394 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list);
1395 ec->ec_multicnt++;
1396 splx(s);
1397 /*
1398 * Return ENETRESET to inform the driver that the list has changed
1399 * and its reception filter should be adjusted accordingly.
1400 */
1401 return (ENETRESET);
1402 }
1403
1404 /*
1405 * Delete a multicast address record.
1406 */
1407 int
1408 ether_delmulti(struct ifreq *ifr, struct ethercom *ec)
1409 {
1410 struct ether_multi *enm;
1411 u_char addrlo[ETHER_ADDR_LEN];
1412 u_char addrhi[ETHER_ADDR_LEN];
1413 int s = splnet(), error;
1414
1415 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
1416 if (error != 0) {
1417 splx(s);
1418 return (error);
1419 }
1420
1421 /*
1422 * Look ur the address in our list.
1423 */
1424 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm);
1425 if (enm == NULL) {
1426 splx(s);
1427 return (ENXIO);
1428 }
1429 if (--enm->enm_refcount != 0) {
1430 /*
1431 * Still some claims to this record.
1432 */
1433 splx(s);
1434 return (0);
1435 }
1436 /*
1437 * No remaining claims to this record; unlink and free it.
1438 */
1439 LIST_REMOVE(enm, enm_list);
1440 free(enm, M_IFMADDR);
1441 ec->ec_multicnt--;
1442 splx(s);
1443 /*
1444 * Return ENETRESET to inform the driver that the list has changed
1445 * and its reception filter should be adjusted accordingly.
1446 */
1447 return (ENETRESET);
1448 }
1449
1450 /*
1451 * Common ioctls for Ethernet interfaces. Note, we must be
1452 * called at splnet().
1453 */
1454 int
1455 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1456 {
1457 struct ethercom *ec = (void *) ifp;
1458 struct ifreq *ifr = (struct ifreq *)data;
1459 struct ifaddr *ifa = (struct ifaddr *)data;
1460 int error = 0;
1461
1462 switch (cmd) {
1463 case SIOCSIFADDR:
1464 ifp->if_flags |= IFF_UP;
1465 switch (ifa->ifa_addr->sa_family) {
1466 case AF_LINK:
1467 {
1468 struct sockaddr_dl *sdl =
1469 (struct sockaddr_dl *) ifa->ifa_addr;
1470
1471 if (sdl->sdl_type != IFT_ETHER ||
1472 sdl->sdl_alen != ifp->if_addrlen) {
1473 error = EINVAL;
1474 break;
1475 }
1476
1477 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl),
1478 ifp->if_addrlen);
1479
1480 /* Set new address. */
1481 error = (*ifp->if_init)(ifp);
1482 break;
1483 }
1484 #ifdef INET
1485 case AF_INET:
1486 if ((ifp->if_flags & IFF_RUNNING) == 0 &&
1487 (error = (*ifp->if_init)(ifp)) != 0)
1488 break;
1489 arp_ifinit(ifp, ifa);
1490 break;
1491 #endif /* INET */
1492 default:
1493 if ((ifp->if_flags & IFF_RUNNING) == 0)
1494 error = (*ifp->if_init)(ifp);
1495 break;
1496 }
1497 break;
1498
1499 case SIOCGIFADDR:
1500 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data,
1501 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN);
1502 break;
1503
1504 case SIOCSIFMTU:
1505 {
1506 int maxmtu;
1507
1508 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
1509 maxmtu = ETHERMTU_JUMBO;
1510 else
1511 maxmtu = ETHERMTU;
1512
1513 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
1514 error = EINVAL;
1515 else {
1516 ifp->if_mtu = ifr->ifr_mtu;
1517
1518 /* Make sure the device notices the MTU change. */
1519 if (ifp->if_flags & IFF_UP)
1520 error = (*ifp->if_init)(ifp);
1521 }
1522 break;
1523 }
1524
1525 case SIOCSIFFLAGS:
1526 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {
1527 /*
1528 * If interface is marked down and it is running,
1529 * then stop and disable it.
1530 */
1531 (*ifp->if_stop)(ifp, 1);
1532 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) {
1533 /*
1534 * If interface is marked up and it is stopped, then
1535 * start it.
1536 */
1537 error = (*ifp->if_init)(ifp);
1538 } else if ((ifp->if_flags & IFF_UP) != 0) {
1539 /*
1540 * Reset the interface to pick up changes in any other
1541 * flags that affect the hardware state.
1542 */
1543 error = (*ifp->if_init)(ifp);
1544 }
1545 break;
1546
1547 case SIOCADDMULTI:
1548 error = ether_addmulti(ifr, ec);
1549 break;
1550
1551 case SIOCDELMULTI:
1552 error = ether_delmulti(ifr, ec);
1553 break;
1554
1555 default:
1556 error = ENOTTY;
1557 }
1558
1559 return (error);
1560 }
Cache object: 1fac041d5a64a21620c11038f4bb47b2
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