xref: /netbsd-src/sys/net/if_ieee1394subr.c (revision 181254a7b1bdde6873432bffef2d2decc4b5c22f) 
1 /*	$NetBSD: if_ieee1394subr.c,v 1.66 2020/08/28 06:23:42 ozaki-r Exp $	*/
2 
3 /*
4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Atsushi Onoe.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: if_ieee1394subr.c,v 1.66 2020/08/28 06:23:42 ozaki-r Exp $");
34 
35 #ifdef _KERNEL_OPT
36 #include "opt_inet.h"
37 #endif
38 
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/bus.h>
42 #include <sys/device.h>
43 #include <sys/kernel.h>
44 #include <sys/mbuf.h>
45 #include <sys/socket.h>
46 #include <sys/sockio.h>
47 #include <sys/select.h>
48 
49 #include <net/if.h>
50 #include <net/if_dl.h>
51 #include <net/if_ieee1394.h>
52 #include <net/if_types.h>
53 #include <net/if_media.h>
54 #include <net/ethertypes.h>
55 #include <net/netisr.h>
56 #include <net/route.h>
57 
58 #include <net/bpf.h>
59 
60 #ifdef INET
61 #include <netinet/in.h>
62 #include <netinet/in_var.h>
63 #include <netinet/if_inarp.h>
64 #endif /* INET */
65 #ifdef INET6
66 #include <netinet/in.h>
67 #include <netinet6/in6_var.h>
68 #include <netinet6/nd6.h>
69 #endif /* INET6 */
70 
71 #include <dev/ieee1394/firewire.h>
72 
73 #include <dev/ieee1394/firewirereg.h>
74 #include <dev/ieee1394/iec13213.h>
75 #include <dev/ieee1394/if_fwipvar.h>
76 
77 #define	IEEE1394_REASS_TIMEOUT	3	/* 3 sec */
78 
79 #define	senderr(e)	do { error = (e); goto bad; } while(0/*CONSTCOND*/)
80 
81 static int  ieee1394_output(struct ifnet *, struct mbuf *,
82 		const struct sockaddr *, const struct rtentry *);
83 static struct mbuf *ieee1394_reass(struct ifnet *, struct mbuf *, uint16_t);
84 
85 static int
86 ieee1394_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
87     const struct rtentry *rt)
88 {
89 	uint16_t etype = 0;
90 	struct mbuf *m;
91 	int hdrlen, error = 0;
92 	struct mbuf *mcopy = NULL;
93 	struct ieee1394_hwaddr *hwdst, baddr;
94 	const struct ieee1394_hwaddr *myaddr;
95 #ifdef INET
96 	struct arphdr *ah;
97 #endif /* INET */
98 	struct m_tag *mtag;
99 	int unicast;
100 
101 	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
102 		senderr(ENETDOWN);
103 
104 	/*
105 	 * If the queueing discipline needs packet classification,
106 	 * do it before prepending link headers.
107 	 */
108 	IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family);
109 
110 	/*
111 	 * For unicast, we make a tag to store the lladdr of the
112 	 * destination. This might not be the first time we have seen
113 	 * the packet (for instance, the arp code might be trying to
114 	 * re-send it after receiving an arp reply) so we only
115 	 * allocate a tag if there isn't one there already. For
116 	 * multicast, we will eventually use a different tag to store
117 	 * the channel number.
118 	 */
119 	unicast = !(m0->m_flags & (M_BCAST | M_MCAST));
120 	if (unicast) {
121 		mtag = m_tag_find(m0, MTAG_FIREWIRE_HWADDR);
122 		if (!mtag) {
123 			mtag = m_tag_get(MTAG_FIREWIRE_HWADDR,
124 			    sizeof (struct ieee1394_hwaddr), M_NOWAIT);
125 			if (!mtag) {
126 				error = ENOMEM;
127 				goto bad;
128 			}
129 			m_tag_prepend(m0, mtag);
130 		}
131 		hwdst = (struct ieee1394_hwaddr *)(mtag + 1);
132 	} else {
133 		hwdst = &baddr;
134 	}
135 
136 	switch (dst->sa_family) {
137 #ifdef INET
138 	case AF_INET:
139 		if (unicast &&
140 		    (error = arpresolve(ifp, rt, m0, dst, hwdst,
141 			sizeof(*hwdst))) != 0)
142 			return error == EWOULDBLOCK ? 0 : error;
143 		/* if broadcasting on a simplex interface, loopback a copy */
144 		if ((m0->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
145 			mcopy = m_copypacket(m0, M_DONTWAIT);
146 		etype = htons(ETHERTYPE_IP);
147 		break;
148 	case AF_ARP:
149 		ah = mtod(m0, struct arphdr *);
150 		ah->ar_hrd = htons(ARPHRD_IEEE1394);
151 		etype = htons(ETHERTYPE_ARP);
152 		break;
153 #endif /* INET */
154 #ifdef INET6
155 	case AF_INET6:
156 #if 0
157 		/*
158 		 * XXX This code was in nd6_storelladdr, which was replaced with
159 		 * nd6_resolve, but it never be used because nd6_storelladdr was
160 		 * called only if unicast. Should it be enabled?
161 		 */
162 		if (m0->m_flags & M_BCAST)
163 			memcpy(hwdst->iha_uid, ifp->if_broadcastaddr,
164 			    MIN(IEEE1394_ADDR_LEN, ifp->if_addrlen));
165 #endif
166 		if (unicast) {
167 			error = nd6_resolve(ifp, rt, m0, dst, hwdst->iha_uid,
168 			    IEEE1394_ADDR_LEN);
169 			if (error != 0)
170 				return error == EWOULDBLOCK ? 0 : error;
171 		}
172 		etype = htons(ETHERTYPE_IPV6);
173 		break;
174 #endif /* INET6 */
175 
176 	case pseudo_AF_HDRCMPLT:
177 	case AF_UNSPEC:
178 		/* TODO? */
179 	default:
180 		printf("%s: can't handle af%d\n", ifp->if_xname,
181 		    dst->sa_family);
182 		senderr(EAFNOSUPPORT);
183 		break;
184 	}
185 
186 	if (mcopy)
187 		looutput(ifp, mcopy, dst, rt);
188 	myaddr = (const struct ieee1394_hwaddr *)CLLADDR(ifp->if_sadl);
189 	if (ifp->if_bpf) {
190 		struct ieee1394_bpfhdr h;
191 		if (unicast)
192 			memcpy(h.ibh_dhost, hwdst->iha_uid, 8);
193 		else
194 			memcpy(h.ibh_dhost,
195 			    ((const struct ieee1394_hwaddr *)
196 			    ifp->if_broadcastaddr)->iha_uid, 8);
197 		memcpy(h.ibh_shost, myaddr->iha_uid, 8);
198 		h.ibh_type = etype;
199 		bpf_mtap2(ifp->if_bpf, &h, sizeof(h), m0, BPF_D_OUT);
200 	}
201 	if ((ifp->if_flags & IFF_SIMPLEX) &&
202 	    unicast &&
203 	    memcmp(hwdst, myaddr, IEEE1394_ADDR_LEN) == 0)
204 		return looutput(ifp, m0, dst, rt);
205 
206 	/*
207 	 * XXX:
208 	 * The maximum possible rate depends on the topology.
209 	 * So the determination of maxrec and fragmentation should be
210 	 * called from the driver after probing the topology map.
211 	 */
212 	if (unicast) {
213 		hdrlen = IEEE1394_GASP_LEN;
214 		hwdst->iha_speed = 0;	/* XXX */
215 	} else
216 		hdrlen = 0;
217 
218 	if (hwdst->iha_speed > myaddr->iha_speed)
219 		hwdst->iha_speed = myaddr->iha_speed;
220 	if (hwdst->iha_maxrec > myaddr->iha_maxrec)
221 		hwdst->iha_maxrec = myaddr->iha_maxrec;
222 	if (hwdst->iha_maxrec > (8 + hwdst->iha_speed))
223 		hwdst->iha_maxrec = 8 + hwdst->iha_speed;
224 	if (hwdst->iha_maxrec < 8)
225 			hwdst->iha_maxrec = 8;
226 
227 	m0 = ieee1394_fragment(ifp, m0, (2<<hwdst->iha_maxrec) - hdrlen, etype);
228 	if (m0 == NULL)
229 		senderr(ENOBUFS);
230 
231 	while ((m = m0) != NULL) {
232 		m0 = m->m_nextpkt;
233 
234 		error = if_transmit_lock(ifp, m);
235 		if (error) {
236 			/* mbuf is already freed */
237 			goto bad;
238 		}
239 	}
240 	return 0;
241 
242   bad:
243 	while (m0 != NULL) {
244 		m = m0->m_nextpkt;
245 		m_freem(m0);
246 		m0 = m;
247 	}
248 
249 	return error;
250 }
251 
252 struct mbuf *
253 ieee1394_fragment(struct ifnet *ifp, struct mbuf *m0, int maxsize,
254     uint16_t etype)
255 {
256 	struct ieee1394com *ic = (struct ieee1394com *)ifp;
257 	int totlen, fraglen, off;
258 	struct mbuf *m, **mp;
259 	struct ieee1394_fraghdr *ifh;
260 	struct ieee1394_unfraghdr *iuh;
261 
262 	totlen = m0->m_pkthdr.len;
263 	if (totlen + sizeof(struct ieee1394_unfraghdr) <= maxsize) {
264 		M_PREPEND(m0, sizeof(struct ieee1394_unfraghdr), M_DONTWAIT);
265 		if (m0 == NULL)
266 			goto bad;
267 		iuh = mtod(m0, struct ieee1394_unfraghdr *);
268 		iuh->iuh_ft = 0;
269 		iuh->iuh_etype = etype;
270 		return m0;
271 	}
272 
273 	fraglen = maxsize - sizeof(struct ieee1394_fraghdr);
274 
275 	M_PREPEND(m0, sizeof(struct ieee1394_fraghdr), M_DONTWAIT);
276 	if (m0 == NULL)
277 		goto bad;
278 	ifh = mtod(m0, struct ieee1394_fraghdr *);
279 	ifh->ifh_ft_size = htons(IEEE1394_FT_MORE | (totlen - 1));
280 	ifh->ifh_etype_off = etype;
281 	ifh->ifh_dgl = htons(ic->ic_dgl);
282 	ifh->ifh_reserved = 0;
283 	off = fraglen;
284 	mp = &m0->m_nextpkt;
285 	while (off < totlen) {
286 		if (off + fraglen > totlen)
287 			fraglen = totlen - off;
288 		MGETHDR(m, M_DONTWAIT, MT_HEADER);
289 		if (m == NULL)
290 			goto bad;
291 		m->m_flags |= m0->m_flags & (M_BCAST|M_MCAST);	/* copy bcast */
292 		m_align(m, sizeof(struct ieee1394_fraghdr));
293 		m->m_len = sizeof(struct ieee1394_fraghdr);
294 		ifh = mtod(m, struct ieee1394_fraghdr *);
295 		ifh->ifh_ft_size =
296 		    htons(IEEE1394_FT_SUBSEQ | IEEE1394_FT_MORE | (totlen - 1));
297 		ifh->ifh_etype_off = htons(off);
298 		ifh->ifh_dgl = htons(ic->ic_dgl);
299 		ifh->ifh_reserved = 0;
300 		m->m_next = m_copym(m0, sizeof(*ifh) + off, fraglen, M_DONTWAIT);
301 		if (m->m_next == NULL) {
302 			m_freem(m);
303 			goto bad;
304 		}
305 		m->m_pkthdr.len = sizeof(*ifh) + fraglen;
306 		off += fraglen;
307 		*mp = m;
308 		mp = &m->m_nextpkt;
309 	}
310 	ifh->ifh_ft_size &= ~htons(IEEE1394_FT_MORE);	/* last fragment */
311 	m_adj(m0, -(m0->m_pkthdr.len - maxsize));
312 
313 	ic->ic_dgl++;
314 	return m0;
315 
316   bad:
317 	while ((m = m0) != NULL) {
318 		m0 = m->m_nextpkt;
319 		m->m_nextpkt = NULL;
320 		m_freem(m);
321 	}
322 	return NULL;
323 }
324 
325 void
326 ieee1394_input(struct ifnet *ifp, struct mbuf *m, uint16_t src)
327 {
328 	pktqueue_t *pktq = NULL;
329 	struct ifqueue *inq;
330 	uint16_t etype;
331 	struct ieee1394_unfraghdr *iuh;
332 	int isr = 0;
333 
334 	if ((ifp->if_flags & IFF_UP) == 0) {
335 		m_freem(m);
336 		return;
337 	}
338 	if (m->m_len < sizeof(*iuh)) {
339 		if ((m = m_pullup(m, sizeof(*iuh))) == NULL)
340 			return;
341 	}
342 
343 	iuh = mtod(m, struct ieee1394_unfraghdr *);
344 
345 	if (ntohs(iuh->iuh_ft) & (IEEE1394_FT_SUBSEQ | IEEE1394_FT_MORE)) {
346 		if ((m = ieee1394_reass(ifp, m, src)) == NULL)
347 			return;
348 		iuh = mtod(m, struct ieee1394_unfraghdr *);
349 	}
350 	etype = ntohs(iuh->iuh_etype);
351 
352 	/* strip off the ieee1394 header */
353 	m_adj(m, sizeof(*iuh));
354 	if (ifp->if_bpf) {
355 		struct ieee1394_bpfhdr h;
356 		struct m_tag *mtag;
357 		const struct ieee1394_hwaddr *myaddr;
358 
359 		mtag = m_tag_find(m, MTAG_FIREWIRE_SENDER_EUID);
360 		if (mtag)
361 			memcpy(h.ibh_shost, mtag + 1, 8);
362 		else
363 			memset(h.ibh_shost, 0, 8);
364 		if (m->m_flags & M_BCAST)
365 			memcpy(h.ibh_dhost,
366 			    ((const struct ieee1394_hwaddr *)
367 			    ifp->if_broadcastaddr)->iha_uid, 8);
368 		else {
369 			myaddr =
370 			  (const struct ieee1394_hwaddr *)CLLADDR(ifp->if_sadl);
371 			memcpy(h.ibh_dhost, myaddr->iha_uid, 8);
372 		}
373 		h.ibh_type = htons(etype);
374 		bpf_mtap2(ifp->if_bpf, &h, sizeof(h), m, BPF_D_IN);
375 	}
376 
377 	switch (etype) {
378 #ifdef INET
379 	case ETHERTYPE_IP:
380 		pktq = ip_pktq;
381 		break;
382 
383 	case ETHERTYPE_ARP:
384 		isr = NETISR_ARP;
385 		inq = &arpintrq;
386 		break;
387 #endif /* INET */
388 
389 #ifdef INET6
390 	case ETHERTYPE_IPV6:
391 		pktq = ip6_pktq;
392 		break;
393 #endif /* INET6 */
394 
395 	default:
396 		m_freem(m);
397 		return;
398 	}
399 
400 	if (__predict_true(pktq)) {
401 		if (__predict_false(!pktq_enqueue(pktq, m, 0))) {
402 			m_freem(m);
403 		}
404 		return;
405 	}
406 
407 	IFQ_ENQUEUE_ISR(inq, m, isr);
408 }
409 
410 static struct mbuf *
411 ieee1394_reass(struct ifnet *ifp, struct mbuf *m0, uint16_t src)
412 {
413 	struct ieee1394com *ic = (struct ieee1394com *)ifp;
414 	struct ieee1394_fraghdr *ifh;
415 	struct ieee1394_unfraghdr *iuh;
416 	struct ieee1394_reassq *rq;
417 	struct ieee1394_reass_pkt *rp, *trp, *nrp = NULL;
418 	int len;
419 	uint16_t etype, off, ftype, size, dgl;
420 	uint32_t id;
421 
422 	if (m0->m_len < sizeof(*ifh)) {
423 		if ((m0 = m_pullup(m0, sizeof(*ifh))) == NULL)
424 			return NULL;
425 	}
426 	ifh = mtod(m0, struct ieee1394_fraghdr *);
427 	m_adj(m0, sizeof(*ifh));
428 	size = ntohs(ifh->ifh_ft_size);
429 	ftype = size & (IEEE1394_FT_SUBSEQ | IEEE1394_FT_MORE);
430 	size = (size & ~ftype) + 1;
431 	dgl = ntohs(ifh->ifh_dgl);
432 	len = m0->m_pkthdr.len;
433 	id = dgl | (src << 16);
434 	if (ftype & IEEE1394_FT_SUBSEQ) {
435 		m_remove_pkthdr(m0);
436 		etype = 0;
437 		off = ntohs(ifh->ifh_etype_off);
438 	} else {
439 		etype = ifh->ifh_etype_off;
440 		off = 0;
441 	}
442 
443 	for (rq = LIST_FIRST(&ic->ic_reassq); ; rq = LIST_NEXT(rq, rq_node)) {
444 		if (rq == NULL) {
445 			/*
446 			 * Create a new reassemble queue head for the node.
447 			 */
448 			rq = malloc(sizeof(*rq), M_FTABLE, M_NOWAIT);
449 			if (rq == NULL) {
450 				m_freem(m0);
451 				return NULL;
452 			}
453 			rq->fr_id = id;
454 			LIST_INIT(&rq->rq_pkt);
455 			LIST_INSERT_HEAD(&ic->ic_reassq, rq, rq_node);
456 			break;
457 		}
458 		if (rq->fr_id == id)
459 			break;
460 	}
461 	for (rp = LIST_FIRST(&rq->rq_pkt); rp != NULL; rp = nrp) {
462 		nrp = LIST_NEXT(rp, rp_next);
463 		if (rp->rp_dgl != dgl)
464 			continue;
465 		/*
466 		 * sanity check:
467 		 * datagram size must be same for all fragments, and
468 		 * no overlap is allowed.
469 		 */
470 		if (rp->rp_size != size ||
471 		    (off < rp->rp_off + rp->rp_len && off + len > rp->rp_off)) {
472 			/*
473 			 * This happens probably due to wrapping dgl value.
474 			 * Destroy all previously received fragment and
475 			 * enqueue current fragment.
476 			 */
477 			for (rp = LIST_FIRST(&rq->rq_pkt); rp != NULL;
478 			    rp = nrp) {
479 				nrp = LIST_NEXT(rp, rp_next);
480 				if (rp->rp_dgl == dgl) {
481 					LIST_REMOVE(rp, rp_next);
482 					m_freem(rp->rp_m);
483 					free(rp, M_FTABLE);
484 				}
485 			}
486 			break;
487 		}
488 		if (rp->rp_off + rp->rp_len == off) {
489 			/*
490 			 * All the subsequent fragments received in sequence
491 			 * come here.
492 			 * Concatinate mbuf to previous one instead of
493 			 * allocating new reassemble queue structure,
494 			 * and try to merge more with the subsequent fragment
495 			 * in the queue.
496 			 */
497 			m_cat(rp->rp_m, m0);
498 			rp->rp_len += len;
499 			while (rp->rp_off + rp->rp_len < size &&
500 			    nrp != NULL && nrp->rp_dgl == dgl &&
501 			    nrp->rp_off == rp->rp_off + rp->rp_len) {
502 				LIST_REMOVE(nrp, rp_next);
503 				m_cat(rp->rp_m, nrp->rp_m);
504 				rp->rp_len += nrp->rp_len;
505 				free(nrp, M_FTABLE);
506 				nrp = LIST_NEXT(rp, rp_next);
507 			}
508 			m0 = NULL;	/* mark merged */
509 			break;
510 		}
511 		if (off + m0->m_pkthdr.len == rp->rp_off) {
512 			m_cat(m0, rp->rp_m);
513 			rp->rp_m = m0;
514 			rp->rp_off = off;
515 			rp->rp_etype = etype;	 /* over writing trust etype */
516 			rp->rp_len += len;
517 			m0 = NULL;	/* mark merged */
518 			break;
519 		}
520 		if (rp->rp_off > off) {
521 			/* insert before rp */
522 			nrp = rp;
523 			break;
524 		}
525 		if (nrp == NULL || nrp->rp_dgl != dgl) {
526 			/* insert after rp */
527 			nrp = NULL;
528 			break;
529 		}
530 	}
531 	if (m0 == NULL) {
532 		if (rp->rp_off != 0 || rp->rp_len != size)
533 			return NULL;
534 		/* fragment done */
535 		LIST_REMOVE(rp, rp_next);
536 		m0 = rp->rp_m;
537 		m0->m_pkthdr.len = rp->rp_len;
538 		M_PREPEND(m0, sizeof(*iuh), M_DONTWAIT);
539 		if (m0 != NULL) {
540 			iuh = mtod(m0, struct ieee1394_unfraghdr *);
541 			iuh->iuh_ft = 0;
542 			iuh->iuh_etype = rp->rp_etype;
543 		}
544 		free(rp, M_FTABLE);
545 		return m0;
546 	}
547 
548 	/*
549 	 * New fragment received.  Allocate reassemble queue structure.
550 	 */
551 	trp = malloc(sizeof(*trp), M_FTABLE, M_NOWAIT);
552 	if (trp == NULL) {
553 		m_freem(m0);
554 		return NULL;
555 	}
556 	trp->rp_m = m0;
557 	trp->rp_size = size;
558 	trp->rp_etype = etype;		 /* valid only if off==0 */
559 	trp->rp_off = off;
560 	trp->rp_dgl = dgl;
561 	trp->rp_len = len;
562 	trp->rp_ttl = IEEE1394_REASS_TIMEOUT;
563 	if (trp->rp_ttl <= ifp->if_timer)
564 		trp->rp_ttl = ifp->if_timer + 1;
565 
566 	if (rp == NULL) {
567 		/* first fragment for the dgl */
568 		LIST_INSERT_HEAD(&rq->rq_pkt, trp, rp_next);
569 	} else if (nrp == NULL) {
570 		/* no next fragment for the dgl */
571 		LIST_INSERT_AFTER(rp, trp, rp_next);
572 	} else {
573 		/* there is a hole */
574 		LIST_INSERT_BEFORE(nrp, trp, rp_next);
575 	}
576 	return NULL;
577 }
578 
579 void
580 ieee1394_drain(struct ifnet *ifp)
581 {
582 	struct ieee1394com *ic = (struct ieee1394com *)ifp;
583 	struct ieee1394_reassq *rq;
584 	struct ieee1394_reass_pkt *rp;
585 
586 	while ((rq = LIST_FIRST(&ic->ic_reassq)) != NULL) {
587 		LIST_REMOVE(rq, rq_node);
588 		while ((rp = LIST_FIRST(&rq->rq_pkt)) != NULL) {
589 			LIST_REMOVE(rp, rp_next);
590 			m_freem(rp->rp_m);
591 			free(rp, M_FTABLE);
592 		}
593 		free(rq, M_FTABLE);
594 	}
595 }
596 
597 void
598 ieee1394_watchdog(struct ifnet *ifp)
599 {
600 	struct ieee1394com *ic = (struct ieee1394com *)ifp;
601 	struct ieee1394_reassq *rq;
602 	struct ieee1394_reass_pkt *rp, *nrp;
603 	int dec;
604 
605 	dec = (ifp->if_timer > 0) ? ifp->if_timer : 1;
606 	for (rq = LIST_FIRST(&ic->ic_reassq); rq != NULL;
607 	    rq = LIST_NEXT(rq, rq_node)) {
608 		for (rp = LIST_FIRST(&rq->rq_pkt); rp != NULL; rp = nrp) {
609 			nrp = LIST_NEXT(rp, rp_next);
610 			if (rp->rp_ttl >= dec)
611 				rp->rp_ttl -= dec;
612 			else {
613 				LIST_REMOVE(rp, rp_next);
614 				m_freem(rp->rp_m);
615 				free(rp, M_FTABLE);
616 			}
617 		}
618 	}
619 }
620 
621 const char *
622 ieee1394_sprintf(const uint8_t *laddr)
623 {
624 	static char buf[3*8];
625 
626 	snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
627 	    laddr[0], laddr[1], laddr[2], laddr[3],
628 	    laddr[4], laddr[5], laddr[6], laddr[7]);
629 	return buf;
630 }
631 
632 void
633 ieee1394_ifattach(struct ifnet *ifp, const struct ieee1394_hwaddr *hwaddr)
634 {
635 	struct ieee1394_hwaddr *baddr;
636 	struct ieee1394com *ic = (struct ieee1394com *)ifp;
637 
638 	ifp->if_type = IFT_IEEE1394;
639 	ifp->if_hdrlen = sizeof(struct ieee1394_header);
640 	ifp->if_dlt = DLT_EN10MB;	/* XXX */
641 	ifp->if_mtu = IEEE1394MTU;
642 	ifp->if_output = ieee1394_output;
643 	ifp->if_drain = ieee1394_drain;
644 	ifp->if_watchdog = ieee1394_watchdog;
645 	ifp->if_timer = 1;
646 	if (ifp->if_baudrate == 0)
647 		ifp->if_baudrate = IF_Mbps(100);
648 
649 	if_set_sadl(ifp, hwaddr, sizeof(struct ieee1394_hwaddr), true);
650 
651 	baddr = malloc(ifp->if_addrlen, M_DEVBUF, M_WAITOK);
652 	memset(baddr->iha_uid, 0xff, IEEE1394_ADDR_LEN);
653 	baddr->iha_speed = 0;	/*XXX: how to determine the speed for bcast? */
654 	baddr->iha_maxrec = 512 << baddr->iha_speed;
655 	memset(baddr->iha_offset, 0, sizeof(baddr->iha_offset));
656 	ifp->if_broadcastaddr = (uint8_t *)baddr;
657 	LIST_INIT(&ic->ic_reassq);
658 	bpf_attach(ifp, DLT_APPLE_IP_OVER_IEEE1394,
659 	    sizeof(struct ieee1394_hwaddr));
660 }
661 
662 void
663 ieee1394_ifdetach(struct ifnet *ifp)
664 {
665 	ieee1394_drain(ifp);
666 	bpf_detach(ifp);
667 	free(__UNCONST(ifp->if_broadcastaddr), M_DEVBUF);
668 	ifp->if_broadcastaddr = NULL;
669 }
670 
671 int
672 ieee1394_ioctl(struct ifnet *ifp, u_long cmd, void *data)
673 {
674 	struct ifreq *ifr = (struct ifreq *)data;
675 	struct ifaddr *ifa = (struct ifaddr *)data;
676 	int error = 0;
677 
678 	switch (cmd) {
679 	case SIOCINITIFADDR:
680 		ifp->if_flags |= IFF_UP;
681 		switch (ifa->ifa_addr->sa_family) {
682 #ifdef INET
683 		case AF_INET:
684 			if ((error = (*ifp->if_init)(ifp)) != 0)
685 				break;
686 			arp_ifinit(ifp, ifa);
687 			break;
688 #endif /* INET */
689 		default:
690 			error = (*ifp->if_init)(ifp);
691 			break;
692 		}
693 		break;
694 
695 	case SIOCSIFMTU:
696 		if (ifr->ifr_mtu > IEEE1394MTU)
697 			error = EINVAL;
698 		else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
699 			error = 0;
700 		break;
701 
702 	default:
703 		error = ifioctl_common(ifp, cmd, data);
704 		break;
705 	}
706 
707 	return error;
708 }
709