if_iso88025subr.c revision 59760 
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 59760 2000-04-29 15:36:14Z phk $
34 *
35 */
36
37/*
38 *
39 * General ISO 802.5 (Token Ring) support routines
40 *
41 */
42
43#include "opt_inet.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/mbuf.h>
48#include <sys/socket.h>
49#include <sys/sockio.h>
50#include <sys/sysctl.h>
51
52#include <net/if.h>
53#include <net/netisr.h>
54#include <net/route.h>
55#include <net/if_llc.h>
56#include <net/if_dl.h>
57#include <net/if_types.h>
58
59#include <net/if_arp.h>
60
61#include <net/iso88025.h>
62
63#ifdef INET
64#include <netinet/in.h>
65#include <netinet/in_var.h>
66#include <netinet/if_ether.h>
67#endif
68
69#include <net/bpf.h>
70
71#include <machine/clock.h>
72#include <machine/md_var.h>
73
74#include <i386/isa/isa_device.h>
75
76#include <vm/vm.h>
77#include <vm/vm_param.h>
78#include <vm/pmap.h>
79
80#include <net/iso88025.h>
81
82void
83iso88025_ifattach(struct ifnet *ifp)
84{
85    register struct ifaddr *ifa = NULL;
86    register struct sockaddr_dl *sdl;
87
88    ifp->if_type = IFT_ISO88025;
89    ifp->if_addrlen = ISO88025_ADDR_LEN;
90    ifp->if_hdrlen = ISO88025_HDR_LEN;
91    if (ifp->if_baudrate == 0)
92        ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
93    if (ifp->if_mtu == 0)
94        ifp->if_mtu = ISO88025_DEFAULT_MTU;
95
96        ifa = ifnet_addrs[ifp->if_index - 1];
97        if (ifa == 0) {
98                printf("iso88025_ifattach: no lladdr!\n");
99                return;
100        }
101        sdl = (struct sockaddr_dl *)ifa->ifa_addr;
102        sdl->sdl_type = IFT_ISO88025;
103        sdl->sdl_alen = ifp->if_addrlen;
104        bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
105}
106
107int
108iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
109{
110        struct ifaddr *ifa = (struct ifaddr *) data;
111        struct ifreq *ifr = (struct ifreq *) data;
112        int error = 0;
113
114        switch (command) {
115        case SIOCSIFADDR:
116                ifp->if_flags |= IFF_UP;
117
118                switch (ifa->ifa_addr->sa_family) {
119#ifdef INET
120                case AF_INET:
121                        ifp->if_init(ifp->if_softc);    /* before arpwhohas */
122                        arp_ifinit((struct arpcom *)ifp, ifa);
123                        break;
124#endif
125                default:
126                        ifp->if_init(ifp->if_softc);
127                        break;
128                }
129                break;
130
131        case SIOCGIFADDR:
132                {
133                        struct sockaddr *sa;
134
135                        sa = (struct sockaddr *) & ifr->ifr_data;
136                        bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
137                              (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
138                }
139                break;
140
141        case SIOCSIFMTU:
142                /*
143                 * Set the interface MTU.
144                 */
145                if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
146                        error = EINVAL;
147                } else {
148                        ifp->if_mtu = ifr->ifr_mtu;
149                }
150                break;
151        }
152        return (error);
153}
154
155/*
156 * ISO88025 encapsulation
157 */
158int
159iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt0)
160{
161	register struct iso88025_header *th;
162	struct iso88025_header gen_th;
163	register struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
164        register struct llc *l;
165	register struct sockaddr_dl *sdl = NULL;
166        int s, error = 0, rif_len = 0;
167 	u_char edst[6];
168	register struct rtentry *rt;
169	int len = m->m_pkthdr.len, loop_copy = 0;
170	struct arpcom *ac = (struct arpcom *)ifp;
171
172	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
173		senderr(ENETDOWN);
174	rt = rt0;
175	if (rt) {
176		if ((rt->rt_flags & RTF_UP) == 0) {
177			rt0 = rt = rtalloc1(dst, 1, 0UL);
178			if (rt0)
179				rt->rt_refcnt--;
180			else
181				senderr(EHOSTUNREACH);
182		}
183		if (rt->rt_flags & RTF_GATEWAY) {
184			if (rt->rt_gwroute == 0)
185				goto lookup;
186			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
187				rtfree(rt); rt = rt0;
188			lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
189							  0UL);
190				if ((rt = rt->rt_gwroute) == 0)
191					senderr(EHOSTUNREACH);
192			}
193		}
194		if (rt->rt_flags & RTF_REJECT)
195			if (rt->rt_rmx.rmx_expire == 0 ||
196			    time_second < rt->rt_rmx.rmx_expire)
197				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
198	}
199
200	/* Calculate routing info length based on arp table entry */
201	if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
202		if (sdl->sdl_rcf != NULL)
203			rif_len = TR_RCF_RIFLEN(sdl->sdl_rcf);
204
205	/* Generate a generic 802.5 header for the packet */
206	gen_th.ac = TR_AC;
207	gen_th.fc = TR_LLC_FRAME;
208	memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof(ac->ac_enaddr));
209	if (rif_len) {
210		gen_th.iso88025_shost[0] |= TR_RII;
211		if (rif_len > 2) {
212			gen_th.rcf = sdl->sdl_rcf;
213			memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
214		}
215	}
216
217
218	switch (dst->sa_family) {
219#ifdef INET
220	case AF_INET:
221		if (!arpresolve(ac, rt, m, dst, edst, rt0))
222			return (0);	/* if not yet resolved */
223		/* Add LLC and SNAP headers */
224		M_PREPEND(m, 8, M_DONTWAIT);
225		if (m == 0)
226			senderr(ENOBUFS);
227		l = mtod(m, struct llc *);
228	        l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
229	        l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
230		l->llc_un.type_snap.control = LLC_UI;
231		l->llc_un.type_snap.org_code[0] = 0x0;
232		l->llc_un.type_snap.org_code[1] = 0x0;
233		l->llc_un.type_snap.org_code[2] = 0x0;
234		memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
235		break;
236#endif
237
238	case AF_UNSPEC:
239		/*
240		 * For AF_UNSPEC sockaddr.sa_data must contain all of the
241		 * mac information needed to send the packet.  This allows
242		 * full mac, llc, and source routing function to be controlled.
243		 * llc and source routing information must already be in the
244		 * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
245		 * should be a iso88025_sockaddr_data structure see iso88025.h
246		 */
247                loop_copy = -1;
248		sd = (struct iso88025_sockaddr_data *)dst->sa_data;
249		gen_th.ac = sd->ac;
250		gen_th.fc = sd->fc;
251		memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
252		memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
253		rif_len = 0;
254		break;
255
256	default:
257		printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
258			dst->sa_family);
259		senderr(EAFNOSUPPORT);
260	}
261
262	/*
263	 * Add local net header.  If no space in first mbuf,
264	 * allocate another.
265	 */
266
267	M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
268	if (m == 0)
269		senderr(ENOBUFS);
270
271	/* Copy as much of the generic header as is needed into the mbuf */
272	th = mtod(m, struct iso88025_header *);
273	memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
274
275        /*
276         * If a simplex interface, and the packet is being sent to our
277         * Ethernet address or a broadcast address, loopback a copy.
278         * XXX To make a simplex device behave exactly like a duplex
279         * device, we should copy in the case of sending to our own
280         * ethernet address (thus letting the original actually appear
281         * on the wire). However, we don't do that here for security
282         * reasons and compatibility with the original behavior.
283         */
284        if ((ifp->if_flags & IFF_SIMPLEX) &&
285           (loop_copy != -1)) {
286                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
287                        struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
288                        (void) if_simloop(ifp, n, dst, ISO88025_HDR_LEN);
289                } else if (bcmp(th->iso88025_dhost,
290                    th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
291                        (void) if_simloop(ifp, m, dst, ISO88025_HDR_LEN);
292                        return(0);      /* XXX */
293                }
294        }
295
296        s = splimp();
297	/*
298	 * Queue message on interface, and start output if interface
299	 * not yet active.
300	 */
301	if (IF_QFULL(&ifp->if_snd)) {
302            printf("iso88025_output: packet dropped QFULL.\n");
303		IF_DROP(&ifp->if_snd);
304		splx(s);
305		senderr(ENOBUFS);
306	}
307	IF_ENQUEUE(&ifp->if_snd, m);
308        if ((ifp->if_flags & IFF_OACTIVE) == 0)
309		(*ifp->if_start)(ifp);
310	splx(s);
311	ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
312	if (m->m_flags & M_MCAST)
313		ifp->if_omcasts++;
314	return (error);
315
316bad:
317	if (m)
318		m_freem(m);
319	return (error);
320}
321
322/*
323 * ISO 88025 de-encapsulation
324 */
325void
326iso88025_input(struct ifnet *ifp, struct iso88025_header *th, struct mbuf *m)
327{
328	register struct ifqueue *inq;
329	u_short ether_type;
330	int s;
331	register struct llc *l = mtod(m, struct llc *);
332
333	if ((ifp->if_flags & IFF_UP) == 0) {
334		m_freem(m);
335		return;
336	}
337
338	switch (l->llc_control) {
339	case LLC_UI:
340		break;
341	case LLC_TEST:
342	case LLC_TEST_P:
343	{
344		struct sockaddr sa;
345		struct arpcom *ac = (struct arpcom *)ifp;
346		struct iso88025_sockaddr_data *th2;
347		int i;
348		u_char c = l->llc_dsap;
349
350		if (th->iso88025_shost[0] & TR_RII) { /* XXX */
351			printf("iso88025_input: dropping source routed LLC_TEST\n");
352			m_free(m);
353			return;
354		}
355		l->llc_dsap = l->llc_ssap;
356		l->llc_ssap = c;
357		if (m->m_flags & (M_BCAST | M_MCAST))
358			bcopy((caddr_t)ac->ac_enaddr,
359			      (caddr_t)th->iso88025_dhost, ISO88025_ADDR_LEN);
360		sa.sa_family = AF_UNSPEC;
361		sa.sa_len = sizeof(sa);
362		th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
363		for (i = 0; i < ISO88025_ADDR_LEN; i++) {
364			th2->ether_shost[i] = c = th->iso88025_dhost[i];
365			th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
366			th->iso88025_shost[i] = c;
367		}
368		th2->ac = TR_AC;
369		th2->fc = TR_LLC_FRAME;
370		ifp->if_output(ifp, m, &sa, NULL);
371		return;
372	}
373	default:
374		printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
375		m_freem(m);
376		return;
377	}
378
379        m->m_pkthdr.len -= 8;
380        m->m_len -= 8;
381        m->m_data += 8; /* Length of LLC header in our case */
382
383	ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
384	if (th->iso88025_dhost[0] & 1) {
385		if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)th->iso88025_dhost, sizeof(etherbroadcastaddr)) == 0)
386			m->m_flags |= M_BCAST;
387		else
388			m->m_flags |= M_MCAST;
389	}
390	if (m->m_flags & (M_BCAST|M_MCAST))
391		ifp->if_imcasts++;
392
393	ether_type = ntohs(l->llc_un.type_snap.ether_type);
394
395	switch (ether_type) {
396#ifdef INET
397	case ETHERTYPE_IP:
398		th->iso88025_shost[0] &= ~(TR_RII);
399		if (ipflow_fastforward(m))
400			return;
401		schednetisr(NETISR_IP);
402		inq = &ipintrq;
403		break;
404
405	case ETHERTYPE_ARP:
406		schednetisr(NETISR_ARP);
407		inq = &arpintrq;
408                break;
409#endif
410	default:
411	    m_freem(m);
412	    return;
413	}
414
415	s = splimp();
416	if (IF_QFULL(inq)) {
417		IF_DROP(inq);
418		m_freem(m);
419                printf("iso88025_input: Packet dropped (Queue full).\n");
420	} else
421		IF_ENQUEUE(inq, m);
422	splx(s);
423}
424