if_iso88025subr.c revision 69152 
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 69152 2000-11-25 07:35:38Z jlemon $
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/md_var.h>
72
73#include <i386/isa/isa_device.h>
74
75#include <vm/vm.h>
76#include <vm/vm_param.h>
77#include <vm/pmap.h>
78
79#include <net/iso88025.h>
80
81void
82iso88025_ifattach(struct ifnet *ifp)
83{
84    register struct ifaddr *ifa = NULL;
85    register struct sockaddr_dl *sdl;
86
87    ifp->if_type = IFT_ISO88025;
88    ifp->if_addrlen = ISO88025_ADDR_LEN;
89    ifp->if_hdrlen = ISO88025_HDR_LEN;
90    if (ifp->if_baudrate == 0)
91        ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
92    if (ifp->if_mtu == 0)
93        ifp->if_mtu = ISO88025_DEFAULT_MTU;
94
95        ifa = ifnet_addrs[ifp->if_index - 1];
96        if (ifa == 0) {
97                printf("iso88025_ifattach: no lladdr!\n");
98                return;
99        }
100        sdl = (struct sockaddr_dl *)ifa->ifa_addr;
101        sdl->sdl_type = IFT_ISO88025;
102        sdl->sdl_alen = ifp->if_addrlen;
103        bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
104}
105
106int
107iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
108{
109        struct ifaddr *ifa = (struct ifaddr *) data;
110        struct ifreq *ifr = (struct ifreq *) data;
111        int error = 0;
112
113        switch (command) {
114        case SIOCSIFADDR:
115                ifp->if_flags |= IFF_UP;
116
117                switch (ifa->ifa_addr->sa_family) {
118#ifdef INET
119                case AF_INET:
120                        ifp->if_init(ifp->if_softc);    /* before arpwhohas */
121                        arp_ifinit((struct arpcom *)ifp, ifa);
122                        break;
123#endif
124                default:
125                        ifp->if_init(ifp->if_softc);
126                        break;
127                }
128                break;
129
130        case SIOCGIFADDR:
131                {
132                        struct sockaddr *sa;
133
134                        sa = (struct sockaddr *) & ifr->ifr_data;
135                        bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
136                              (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
137                }
138                break;
139
140        case SIOCSIFMTU:
141                /*
142                 * Set the interface MTU.
143                 */
144                if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
145                        error = EINVAL;
146                } else {
147                        ifp->if_mtu = ifr->ifr_mtu;
148                }
149                break;
150        }
151        return (error);
152}
153
154/*
155 * ISO88025 encapsulation
156 */
157int
158iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt0)
159{
160	register struct iso88025_header *th;
161	struct iso88025_header gen_th;
162	register struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
163        register struct llc *l;
164	register struct sockaddr_dl *sdl = NULL;
165        int error = 0, rif_len = 0;
166 	u_char edst[6];
167	register struct rtentry *rt;
168	int loop_copy = 0;
169	struct arpcom *ac = (struct arpcom *)ifp;
170
171	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
172		senderr(ENETDOWN);
173	rt = rt0;
174	if (rt) {
175		if ((rt->rt_flags & RTF_UP) == 0) {
176			rt0 = rt = rtalloc1(dst, 1, 0UL);
177			if (rt0)
178				rt->rt_refcnt--;
179			else
180				senderr(EHOSTUNREACH);
181		}
182		if (rt->rt_flags & RTF_GATEWAY) {
183			if (rt->rt_gwroute == 0)
184				goto lookup;
185			if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
186				rtfree(rt); rt = rt0;
187			lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
188							  0UL);
189				if ((rt = rt->rt_gwroute) == 0)
190					senderr(EHOSTUNREACH);
191			}
192		}
193		if (rt->rt_flags & RTF_REJECT)
194			if (rt->rt_rmx.rmx_expire == 0 ||
195			    time_second < rt->rt_rmx.rmx_expire)
196				senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
197	}
198
199	/* Calculate routing info length based on arp table entry */
200	if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
201		if (sdl->sdl_rcf != NULL)
202			rif_len = TR_RCF_RIFLEN(sdl->sdl_rcf);
203
204	/* Generate a generic 802.5 header for the packet */
205	gen_th.ac = TR_AC;
206	gen_th.fc = TR_LLC_FRAME;
207	memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof(ac->ac_enaddr));
208	if (rif_len) {
209		gen_th.iso88025_shost[0] |= TR_RII;
210		if (rif_len > 2) {
211			gen_th.rcf = sdl->sdl_rcf;
212			memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
213		}
214	}
215
216
217	switch (dst->sa_family) {
218#ifdef INET
219	case AF_INET:
220		if (!arpresolve(ac, rt, m, dst, edst, rt0))
221			return (0);	/* if not yet resolved */
222		/* Add LLC and SNAP headers */
223		M_PREPEND(m, 8, M_DONTWAIT);
224		if (m == 0)
225			senderr(ENOBUFS);
226		l = mtod(m, struct llc *);
227	        l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
228	        l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
229		l->llc_un.type_snap.control = LLC_UI;
230		l->llc_un.type_snap.org_code[0] = 0x0;
231		l->llc_un.type_snap.org_code[1] = 0x0;
232		l->llc_un.type_snap.org_code[2] = 0x0;
233		memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
234		break;
235#endif
236
237	case AF_UNSPEC:
238		/*
239		 * For AF_UNSPEC sockaddr.sa_data must contain all of the
240		 * mac information needed to send the packet.  This allows
241		 * full mac, llc, and source routing function to be controlled.
242		 * llc and source routing information must already be in the
243		 * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
244		 * should be a iso88025_sockaddr_data structure see iso88025.h
245		 */
246                loop_copy = -1;
247		sd = (struct iso88025_sockaddr_data *)dst->sa_data;
248		gen_th.ac = sd->ac;
249		gen_th.fc = sd->fc;
250		memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
251		memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
252		rif_len = 0;
253		break;
254
255	default:
256		printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
257			dst->sa_family);
258		senderr(EAFNOSUPPORT);
259	}
260
261	/*
262	 * Add local net header.  If no space in first mbuf,
263	 * allocate another.
264	 */
265
266	M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
267	if (m == 0)
268		senderr(ENOBUFS);
269
270	/* Copy as much of the generic header as is needed into the mbuf */
271	th = mtod(m, struct iso88025_header *);
272	memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
273
274        /*
275         * If a simplex interface, and the packet is being sent to our
276         * Ethernet address or a broadcast address, loopback a copy.
277         * XXX To make a simplex device behave exactly like a duplex
278         * device, we should copy in the case of sending to our own
279         * ethernet address (thus letting the original actually appear
280         * on the wire). However, we don't do that here for security
281         * reasons and compatibility with the original behavior.
282         */
283        if ((ifp->if_flags & IFF_SIMPLEX) &&
284           (loop_copy != -1)) {
285                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
286                        struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
287                        (void) if_simloop(ifp,
288			    n, dst->sa_family, ISO88025_HDR_LEN);
289                } else if (bcmp(th->iso88025_dhost,
290                    th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
291                        (void) if_simloop(ifp,
292			    m, dst->sa_family, ISO88025_HDR_LEN);
293                        return(0);      /* XXX */
294                }
295        }
296
297	if (! IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, ISO88025_HDR_LEN + 8)) {
298		printf("iso88025_output: packet dropped QFULL.\n");
299		senderr(ENOBUFS);
300	}
301	return (error);
302
303bad:
304	if (m)
305		m_freem(m);
306	return (error);
307}
308
309/*
310 * ISO 88025 de-encapsulation
311 */
312void
313iso88025_input(struct ifnet *ifp, struct iso88025_header *th, struct mbuf *m)
314{
315	register struct ifqueue *inq;
316	u_short ether_type;
317	register struct llc *l = mtod(m, struct llc *);
318
319	if ((ifp->if_flags & IFF_UP) == 0) {
320		m_freem(m);
321		return;
322	}
323
324	switch (l->llc_control) {
325	case LLC_UI:
326		break;
327	case LLC_TEST:
328	case LLC_TEST_P:
329	{
330		struct sockaddr sa;
331		struct arpcom *ac = (struct arpcom *)ifp;
332		struct iso88025_sockaddr_data *th2;
333		int i;
334		u_char c = l->llc_dsap;
335
336		if (th->iso88025_shost[0] & TR_RII) { /* XXX */
337			printf("iso88025_input: dropping source routed LLC_TEST\n");
338			m_free(m);
339			return;
340		}
341		l->llc_dsap = l->llc_ssap;
342		l->llc_ssap = c;
343		if (m->m_flags & (M_BCAST | M_MCAST))
344			bcopy((caddr_t)ac->ac_enaddr,
345			      (caddr_t)th->iso88025_dhost, ISO88025_ADDR_LEN);
346		sa.sa_family = AF_UNSPEC;
347		sa.sa_len = sizeof(sa);
348		th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
349		for (i = 0; i < ISO88025_ADDR_LEN; i++) {
350			th2->ether_shost[i] = c = th->iso88025_dhost[i];
351			th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
352			th->iso88025_shost[i] = c;
353		}
354		th2->ac = TR_AC;
355		th2->fc = TR_LLC_FRAME;
356		ifp->if_output(ifp, m, &sa, NULL);
357		return;
358	}
359	default:
360		printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
361		m_freem(m);
362		return;
363	}
364
365        m->m_pkthdr.len -= 8;
366        m->m_len -= 8;
367        m->m_data += 8; /* Length of LLC header in our case */
368
369	ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
370	if (th->iso88025_dhost[0] & 1) {
371		if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)th->iso88025_dhost, sizeof(etherbroadcastaddr)) == 0)
372			m->m_flags |= M_BCAST;
373		else
374			m->m_flags |= M_MCAST;
375	}
376	if (m->m_flags & (M_BCAST|M_MCAST))
377		ifp->if_imcasts++;
378
379	ether_type = ntohs(l->llc_un.type_snap.ether_type);
380
381	switch (ether_type) {
382#ifdef INET
383	case ETHERTYPE_IP:
384		th->iso88025_shost[0] &= ~(TR_RII);
385		if (ipflow_fastforward(m))
386			return;
387		schednetisr(NETISR_IP);
388		inq = &ipintrq;
389		break;
390
391	case ETHERTYPE_ARP:
392		schednetisr(NETISR_ARP);
393		inq = &arpintrq;
394                break;
395#endif
396	default:
397	    m_freem(m);
398	    return;
399	}
400
401	if (! IF_HANDOFF(inq, m, NULL))
402                printf("iso88025_input: Packet dropped (Queue full).\n");
403}
404