if_iso88025subr.c revision 111774 
1/*
2 * Copyright (c) 1998, Larry Lile
3 * All rights reserved.
4 *
5 * For latest sources and information on this driver, please
6 * go to http://anarchy.stdio.com.
7 *
8 * Questions, comments or suggestions should be directed to
9 * Larry Lile <lile@stdio.com>.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice unmodified, this list of conditions, and the following
16 *    disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: head/sys/net/if_iso88025subr.c 111774 2003-03-03 00:21:52Z mdodd $
34 *
35 */
36
37/*
38 *
39 * General ISO 802.5 (Token Ring) support routines
40 *
41 */
42
43#include "opt_inet.h"
44#include "opt_inet6.h"
45#include "opt_ipx.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/mbuf.h>
50#include <sys/socket.h>
51#include <sys/sockio.h>
52#include <sys/sysctl.h>
53
54#include <net/if.h>
55#include <net/netisr.h>
56#include <net/route.h>
57#include <net/if_llc.h>
58#include <net/if_dl.h>
59#include <net/if_types.h>
60
61#include <net/if_arp.h>
62
63#include <net/iso88025.h>
64
65#if defined(INET) || defined(INET6)
66#include <netinet/in.h>
67#include <netinet/in_var.h>
68#include <netinet/if_ether.h>
69#endif
70#ifdef INET6
71#include <netinet6/nd6.h>
72#endif
73
74#ifdef IPX
75#include <netipx/ipx.h>
76#include <netipx/ipx_if.h>
77#endif
78
79#include <net/bpf.h>
80
81#include <machine/md_var.h>
82
83#include <vm/vm.h>
84#include <vm/vm_param.h>
85#include <vm/pmap.h>
86
87#include <net/iso88025.h>
88
89#define IFP2AC(IFP) ((struct arpcom *)IFP)
90
91void
92iso88025_ifattach(struct ifnet *ifp)
93{
94    struct ifaddr *ifa = NULL;
95    struct sockaddr_dl *sdl;
96
97    ifp->if_type = IFT_ISO88025;
98    ifp->if_addrlen = ISO88025_ADDR_LEN;
99    ifp->if_hdrlen = ISO88025_HDR_LEN;
100    if (ifp->if_baudrate == 0)
101        ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
102    if (ifp->if_mtu == 0)
103        ifp->if_mtu = ISO88025_DEFAULT_MTU;
104    ifp->if_broadcastaddr = etherbroadcastaddr;
105
106        ifa = ifaddr_byindex(ifp->if_index);
107        if (ifa == 0) {
108                printf("iso88025_ifattach: no lladdr!\n");
109                return;
110        }
111        sdl = (struct sockaddr_dl *)ifa->ifa_addr;
112        sdl->sdl_type = IFT_ISO88025;
113        sdl->sdl_alen = ifp->if_addrlen;
114        bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
115}
116
117/*
118 * Perform common duties while detaching a Token Ring interface
119 */
120void
121iso88025_ifdetach(ifp, bpf)
122        struct ifnet *ifp;
123        int bpf;
124{
125	if (bpf)
126                bpfdetach(ifp);
127	if_detach(ifp);
128}
129
130
131int
132iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
133{
134        struct ifaddr *ifa = (struct ifaddr *) data;
135        struct ifreq *ifr = (struct ifreq *) data;
136        int error = 0;
137
138        switch (command) {
139        case SIOCSIFADDR:
140                ifp->if_flags |= IFF_UP;
141
142                switch (ifa->ifa_addr->sa_family) {
143#ifdef INET
144                case AF_INET:
145                        ifp->if_init(ifp->if_softc);    /* before arpwhohas */
146                        arp_ifinit(ifp, ifa);
147                        break;
148#endif	/* INET */
149#ifdef IPX
150                /*
151                 * XXX - This code is probably wrong
152                 */
153                case AF_IPX:
154                        {
155                        struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
156                        struct arpcom *ac = IFP2AC(ifp);
157
158                        if (ipx_nullhost(*ina))
159                                ina->x_host =
160                                    *(union ipx_host *)
161                                    ac->ac_enaddr;
162                        else {
163                                bcopy((caddr_t) ina->x_host.c_host,
164                                      (caddr_t) ac->ac_enaddr,
165                                      sizeof(ac->ac_enaddr));
166                        }
167
168                        /*
169                         * Set new address
170                         */
171                        ifp->if_init(ifp->if_softc);
172                        break;
173                        }
174#endif	/* IPX */
175                default:
176                        ifp->if_init(ifp->if_softc);
177                        break;
178                }
179                break;
180
181        case SIOCGIFADDR:
182                {
183                        struct sockaddr *sa;
184
185                        sa = (struct sockaddr *) & ifr->ifr_data;
186                        bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
187                              (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
188                }
189                break;
190
191        case SIOCSIFMTU:
192                /*
193                 * Set the interface MTU.
194                 */
195                if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
196                        error = EINVAL;
197                } else {
198                        ifp->if_mtu = ifr->ifr_mtu;
199                }
200                break;
201        }
202        return (error);
203}
204
205/*
206 * ISO88025 encapsulation
207 */
208int
209iso88025_output(ifp, m, dst, rt0)
210	struct ifnet *ifp;
211	struct mbuf *m;
212	struct sockaddr *dst;
213	struct rtentry *rt0;
214{
215	u_int16_t snap_type = 0;
216	int loop_copy = 0, error = 0, rif_len = 0;
217	u_char edst[ISO88025_ADDR_LEN];
218	struct iso88025_header *th;
219	struct iso88025_header gen_th;
220	struct sockaddr_dl *sdl = NULL;
221	struct rtentry *rt;
222	struct arpcom *ac = (struct arpcom *)ifp;
223
224	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
225		senderr(ENETDOWN);
226	getmicrotime(&ifp->if_lastchange);
227
228	error = rt_check(&rt, &rt0, dst);
229	if (error) {
230		goto bad;
231	}
232
233	/* Calculate routing info length based on arp table entry */
234	if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
235		if (SDL_ISO88025(sdl)->trld_rcf != 0)
236			rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
237
238	/* Generate a generic 802.5 header for the packet */
239	gen_th.ac = TR_AC;
240	gen_th.fc = TR_LLC_FRAME;
241	(void)memcpy((caddr_t)gen_th.iso88025_shost, (caddr_t)ac->ac_enaddr,
242		sizeof(ac->ac_enaddr));
243	if (rif_len) {
244		gen_th.iso88025_shost[0] |= TR_RII;
245		if (rif_len > 2) {
246			gen_th.rcf = SDL_ISO88025(sdl)->trld_rcf;
247			(void)memcpy((caddr_t)gen_th.rd,
248				(caddr_t)SDL_ISO88025(sdl)->trld_route,
249				rif_len - 2);
250		}
251	}
252
253	switch (dst->sa_family) {
254#ifdef INET
255	case AF_INET:
256		if (!arpresolve(ifp, rt, m, dst, edst, rt0))
257			return (0);	/* if not yet resolved */
258		snap_type = ETHERTYPE_IP;
259		break;
260#endif	/* INET */
261#ifdef NOT_YET
262#ifdef INET6
263	case AF_INET6:
264		if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
265			/* Something bad happened */
266			return(0);
267		}
268		snap_type = ETHERTYPE_IPV6;
269		break;
270#endif	/* INET6 */
271#endif	/* NOT_YET */
272#ifdef IPX
273	case AF_IPX:
274	{
275		u_int8_t	*cp;
276
277		snap_type = 0;
278		bcopy((caddr_t)&(satoipx_addr(dst).x_host), (caddr_t)edst,
279			sizeof (edst));
280
281		M_PREPEND(m, 3, M_TRYWAIT);
282		if (m == 0)
283			senderr(ENOBUFS);
284		m = m_pullup(m, 3);
285		if (m == 0)
286			senderr(ENOBUFS);
287		cp = mtod(m, u_int8_t *);
288		*cp++ = ETHERTYPE_IPX_8022;
289		*cp++ = ETHERTYPE_IPX_8022;
290		*cp++ = LLC_UI;
291	}
292	break;
293#endif	/* IPX */
294	case AF_UNSPEC:
295	{
296		struct iso88025_sockaddr_data *sd;
297		/*
298		 * For AF_UNSPEC sockaddr.sa_data must contain all of the
299		 * mac information needed to send the packet.  This allows
300		 * full mac, llc, and source routing function to be controlled.
301		 * llc and source routing information must already be in the
302		 * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
303		 * should be an iso88025_sockaddr_data structure see iso88025.h
304		 */
305                loop_copy = -1;
306		sd = (struct iso88025_sockaddr_data *)dst->sa_data;
307		gen_th.ac = sd->ac;
308		gen_th.fc = sd->fc;
309		(void)memcpy((caddr_t)edst, (caddr_t)sd->ether_dhost,
310			sizeof(sd->ether_dhost));
311		(void)memcpy((caddr_t)gen_th.iso88025_shost,
312			(caddr_t)sd->ether_shost, sizeof(sd->ether_shost));
313		rif_len = 0;
314		break;
315	}
316	default:
317		if_printf(ifp, "can't handle af%d\n", dst->sa_family);
318		senderr(EAFNOSUPPORT);
319		break;
320	}
321
322	if (snap_type != 0) {
323        	struct llc *l;
324		M_PREPEND(m, sizeof (struct llc), M_DONTWAIT);
325		if (m == 0)
326			senderr(ENOBUFS);
327		l = mtod(m, struct llc *);
328		l->llc_un.type_snap.ether_type = htons(snap_type);
329		l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
330		l->llc_un.type_snap.control = LLC_UI;
331		l->llc_un.type_snap.org_code[0] =
332			l->llc_un.type_snap.org_code[1] =
333			l->llc_un.type_snap.org_code[2] = 0;
334	}
335
336	/*
337	 * Add local net header.  If no space in first mbuf,
338	 * allocate another.
339	 */
340	M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
341	if (m == 0)
342		senderr(ENOBUFS);
343
344	(void)memcpy((caddr_t)&gen_th.iso88025_dhost, (caddr_t)edst,
345		     sizeof(edst));
346
347	/* Copy as much of the generic header as is needed into the mbuf */
348	th = mtod(m, struct iso88025_header *);
349	memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
350
351        /*
352         * If a simplex interface, and the packet is being sent to our
353         * Ethernet address or a broadcast address, loopback a copy.
354         * XXX To make a simplex device behave exactly like a duplex
355         * device, we should copy in the case of sending to our own
356         * ethernet address (thus letting the original actually appear
357         * on the wire). However, we don't do that here for security
358         * reasons and compatibility with the original behavior.
359         */
360        if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
361                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
362                        struct mbuf *n;
363			n = m_copy(m, 0, (int)M_COPYALL);
364                        (void)if_simloop(ifp, n, dst->sa_family,
365					  ISO88025_HDR_LEN);
366                } else
367			if (bcmp(th->iso88025_dhost, th->iso88025_shost,
368				 ETHER_ADDR_LEN) == 0) {
369				(void)if_simloop(ifp, m, dst->sa_family,
370						 ISO88025_HDR_LEN);
371                        	return(0);      /* XXX */
372			}
373        }
374
375	if (! IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, ISO88025_HDR_LEN + (sizeof(struct llc))) ) {
376		printf("iso88025_output: packet dropped QFULL.\n");
377		senderr(ENOBUFS);
378	}
379	return (error);
380
381bad:
382	if (m)
383		m_freem(m);
384	return (error);
385}
386
387/*
388 * ISO 88025 de-encapsulation
389 */
390void
391iso88025_input(ifp, th, m)
392	struct ifnet *ifp;
393	struct iso88025_header *th;
394	struct mbuf *m;
395{
396	struct ifqueue *inq;
397	struct llc *l;
398
399	if ((ifp->if_flags & IFF_UP) == 0) {
400		m_freem(m);
401		return;
402	}
403
404	getmicrotime(&ifp->if_lastchange);
405	ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
406
407	if (th->iso88025_dhost[0] & 1) {
408		if (bcmp((caddr_t)etherbroadcastaddr,
409			 (caddr_t)th->iso88025_dhost,
410			 sizeof(etherbroadcastaddr)) == 0)
411			m->m_flags |= M_BCAST;
412		else
413			m->m_flags |= M_MCAST;
414		ifp->if_imcasts++;
415	}
416
417	l = mtod(m, struct llc *);
418
419	switch (l->llc_dsap) {
420#ifdef IPX
421	case ETHERTYPE_IPX_8022:	/* Thanks a bunch Novell */
422		if ((l->llc_control != LLC_UI) ||
423		    (l->llc_ssap != ETHERTYPE_IPX_8022))
424			goto dropanyway;
425
426		th->iso88025_shost[0] &= ~(TR_RII);
427		m_adj(m, 3);
428		schednetisr(NETISR_IPX);
429		inq = &ipxintrq;
430		break;
431#endif	/* IPX */
432	case LLC_SNAP_LSAP: {
433		u_int16_t type;
434		if ((l->llc_control != LLC_UI) ||
435		    (l->llc_ssap != LLC_SNAP_LSAP))
436			goto dropanyway;
437
438		if (l->llc_un.type_snap.org_code[0] != 0 ||
439		    l->llc_un.type_snap.org_code[1] != 0 ||
440		    l->llc_un.type_snap.org_code[2] != 0)
441			goto dropanyway;
442
443		type = ntohs(l->llc_un.type_snap.ether_type);
444		m_adj(m, sizeof(struct llc));
445		switch (type) {
446#ifdef INET
447		case ETHERTYPE_IP:
448			th->iso88025_shost[0] &= ~(TR_RII);
449			if (ipflow_fastforward(m))
450				return;
451			schednetisr(NETISR_IP);
452			inq = &ipintrq;
453			break;
454
455		case ETHERTYPE_ARP:
456			if (ifp->if_flags & IFF_NOARP)
457				goto dropanyway;
458			schednetisr(NETISR_ARP);
459			inq = &arpintrq;
460			break;
461#endif	/* INET */
462#ifdef IPX_SNAP	/* XXX: Not supported! */
463		case ETHERTYPE_IPX:
464			th->iso88025_shost[0] &= ~(TR_RII);
465			schednetisr(NETISR_IPX);
466			inq = &ipxintrq;
467			break;
468#endif	/* IPX_SNAP */
469#ifdef NOT_YET
470#ifdef INET6
471		case ETHERTYPE_IPV6:
472			th->iso88025_shost[0] &= ~(TR_RII);
473			schednetisr(NETISR_IPV6);
474			inq = &ip6intrq;
475			break;
476#endif	/* INET6 */
477#endif	/* NOT_YET */
478		default:
479			printf("iso88025_input: unexpected llc_snap ether_type  0x%02x\n", type);
480			m_freem(m);
481			return;
482		}
483		break;
484	}
485	case LLC_ISO_LSAP:
486		switch (l->llc_control) {
487		case LLC_UI:
488			goto dropanyway;
489			break;
490                case LLC_XID:
491                case LLC_XID_P:
492			if(m->m_len < ISO88025_ADDR_LEN)
493				goto dropanyway;
494			l->llc_window = 0;
495			l->llc_fid = 9;
496			l->llc_class = 1;
497			l->llc_dsap = l->llc_ssap = 0;
498			/* Fall through to */
499		case LLC_TEST:
500		case LLC_TEST_P:
501		{
502			struct sockaddr sa;
503			struct arpcom *ac = (struct arpcom *)ifp;
504			struct iso88025_sockaddr_data *th2;
505			int i;
506			u_char c = l->llc_dsap;
507
508			if (th->iso88025_shost[0] & TR_RII) { /* XXX */
509				printf("iso88025_input: dropping source routed LLC_TEST\n");
510				m_free(m);
511				return;
512			}
513			l->llc_dsap = l->llc_ssap;
514			l->llc_ssap = c;
515			if (m->m_flags & (M_BCAST | M_MCAST))
516				bcopy((caddr_t)ac->ac_enaddr,
517			      		(caddr_t)th->iso88025_dhost,
518					ISO88025_ADDR_LEN);
519			sa.sa_family = AF_UNSPEC;
520			sa.sa_len = sizeof(sa);
521			th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
522			for (i = 0; i < ISO88025_ADDR_LEN; i++) {
523				th2->ether_shost[i] = c = th->iso88025_dhost[i];
524				th2->ether_dhost[i] = th->iso88025_dhost[i] =
525					th->iso88025_shost[i];
526				th->iso88025_shost[i] = c;
527			}
528			th2->ac = TR_AC;
529			th2->fc = TR_LLC_FRAME;
530			ifp->if_output(ifp, m, &sa, NULL);
531			return;
532		}
533		default:
534			printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
535			m_freem(m);
536			return;
537		}
538		break;
539	default:
540		printf("iso88025_input: unknown dsap 0x%x\n", l->llc_dsap);
541		ifp->if_noproto++;
542	dropanyway:
543		m_freem(m);
544		return;
545	}
546
547	if (! IF_HANDOFF(inq, m, NULL))
548                printf("iso88025_input: Packet dropped (Queue full).\n");
549}
550