Add a new macro IF_LLSOCKADDR which maps a ifnet pointer to the
[dragonfly.git] / sys / net / if_iso88025subr.c
CommitLineData
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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>.
f23061d4 10 *
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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: src/sys/net/if_iso88025subr.c,v 1.7.2.7 2002/06/18 00:15:31 kbyanc Exp $
f2682cb9 34 * $DragonFly: src/sys/net/Attic/if_iso88025subr.c,v 1.12 2005/06/03 23:23:03 joerg Exp $
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35 *
36 */
37
38/*
39 *
40 * General ISO 802.5 (Token Ring) support routines
f23061d4 41 *
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42 */
43
44#include "opt_inet.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/kernel.h>
49#include <sys/malloc.h>
50#include <sys/mbuf.h>
51#include <sys/socket.h>
f23061d4 52#include <sys/sockio.h>
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53#include <sys/sysctl.h>
54
55#include <net/if.h>
56#include <net/netisr.h>
57#include <net/route.h>
58#include <net/if_llc.h>
59#include <net/if_dl.h>
60#include <net/if_types.h>
61
62#include <net/if_arp.h>
63
64#include <net/iso88025.h>
65
66#ifdef INET
67#include <netinet/in.h>
68#include <netinet/in_var.h>
69#include <netinet/if_ether.h>
70#endif
71
72#include <net/bpf.h>
73
74#include <machine/clock.h>
75#include <machine/md_var.h>
76
1f2de5d4 77#include <bus/isa/i386/isa_device.h>
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78
79#include <vm/vm.h>
80#include <vm/vm_param.h>
81#include <vm/pmap.h>
82
83#include <sys/kernel.h>
84#include <net/iso88025.h>
85
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86static int iso88025_output(struct ifnet *, struct mbuf *,
87 struct sockaddr *, struct rtentry *);
88static void iso88025_input(struct ifnet *, struct mbuf *);
89
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90void
91iso88025_ifattach(struct ifnet *ifp)
92{
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93 struct sockaddr_dl *sdl;
94
95 ifp->if_input = iso88025_input;
96 ifp->if_output = iso88025_output;
97 if_attach(ifp);
98 ifp->if_type = IFT_ISO88025;
99 ifp->if_addrlen = ISO88025_ADDR_LEN;
100 ifp->if_hdrlen = ISO88025_HDR_LEN;
101 if (ifp->if_baudrate == 0)
102 ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
103 if (ifp->if_mtu == 0)
104 ifp->if_mtu = ISO88025_DEFAULT_MTU;
984263bc 105
f2682cb9 106 sdl = IF_LLSOCKADDR(ifp);
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107 sdl->sdl_type = IFT_ISO88025;
108 sdl->sdl_alen = ifp->if_addrlen;
109 bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
3013ac0e 110 bpfattach(ifp, DLT_IEEE802, sizeof(struct iso88025_header));
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111}
112
113int
114iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
115{
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116 struct ifaddr *ifa = (struct ifaddr *) data;
117 struct ifreq *ifr = (struct ifreq *) data;
118 int error = 0;
984263bc 119
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120 switch (command) {
121 case SIOCSIFADDR:
122 ifp->if_flags |= IFF_UP;
984263bc 123
f23061d4 124 switch (ifa->ifa_addr->sa_family) {
984263bc 125#ifdef INET
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126 case AF_INET:
127 ifp->if_init(ifp->if_softc); /* before arpwhohas */
128 arp_ifinit(ifp, ifa);
129 break;
984263bc 130#endif
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131 default:
132 ifp->if_init(ifp->if_softc);
133 break;
134 }
135 break;
136
137 case SIOCGIFADDR:
138 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
139 ((struct sockaddr *)ifr->ifr_data)->sa_data,
140 ISO88025_ADDR_LEN);
141 break;
142
143 case SIOCSIFMTU:
144 /*
145 * Set the interface MTU.
146 */
147 if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
148 error = EINVAL;
149 } else {
150 ifp->if_mtu = ifr->ifr_mtu;
151 }
152 break;
153 }
154 return (error);
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155}
156
157/*
158 * ISO88025 encapsulation
159 */
3013ac0e 160static int
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161iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
162 struct rtentry *rt0)
984263bc 163{
82ed7fc2 164 struct iso88025_header *th;
984263bc 165 struct iso88025_header gen_th;
82ed7fc2 166 struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
f23061d4 167 struct llc *l;
82ed7fc2 168 struct sockaddr_dl *sdl = NULL;
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169 int s, error = 0, rif_len = 0;
170 u_char edst[6];
82ed7fc2 171 struct rtentry *rt;
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172 int len = m->m_pkthdr.len, loop_copy = 0;
173 struct arpcom *ac = (struct arpcom *)ifp;
174
175 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
176 senderr(ENETDOWN);
984263bc 177
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178 if (rt0 == NULL)
179 senderr(EHOSTUNREACH);
180 error = rt_llroute(dst, rt0, &rt);
181 if (error != 0)
182 senderr(error);
183
184 /* Calculate routing info length based on arp table entry. */
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185 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
186 if (SDL_ISO88025(sdl)->trld_rcf != NULL)
187 rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
188
f23061d4 189 /* Generate a generic 802.5 header for the packet. */
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190 gen_th.ac = TR_AC;
191 gen_th.fc = TR_LLC_FRAME;
f23061d4 192 memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof ac->ac_enaddr);
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193 if (rif_len) {
194 gen_th.iso88025_shost[0] |= TR_RII;
195 if (rif_len > 2) {
196 gen_th.rcf = sdl->sdl_rcf;
197 memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
198 }
199 }
f23061d4 200
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201
202 switch (dst->sa_family) {
203#ifdef INET
204 case AF_INET:
f23061d4 205 if (!arpresolve(ifp, rt0, m, dst, edst))
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206 return (0); /* if not yet resolved */
207 /* Add LLC and SNAP headers */
74f1caca 208 M_PREPEND(m, 8, MB_DONTWAIT);
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209 if (m == NULL)
210 return (ENOBUFS);
984263bc 211 l = mtod(m, struct llc *);
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212 l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
213 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
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214 l->llc_un.type_snap.control = LLC_UI;
215 l->llc_un.type_snap.org_code[0] = 0x0;
216 l->llc_un.type_snap.org_code[1] = 0x0;
217 l->llc_un.type_snap.org_code[2] = 0x0;
218 memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
219 break;
220#endif
221
222 case AF_UNSPEC:
223 /*
224 * For AF_UNSPEC sockaddr.sa_data must contain all of the
225 * mac information needed to send the packet. This allows
226 * full mac, llc, and source routing function to be controlled.
227 * llc and source routing information must already be in the
228 * mbuf provided, ac/fc are set in sa_data. sockaddr.sa_data
229 * should be a iso88025_sockaddr_data structure see iso88025.h
230 */
f23061d4 231 loop_copy = -1;
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232 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
233 gen_th.ac = sd->ac;
234 gen_th.fc = sd->fc;
235 memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
236 memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
237 rif_len = 0;
238 break;
239
240 default:
3e4a09e7 241 printf("%s: can't handle af%d\n", ifp->if_xname,
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242 dst->sa_family);
243 senderr(EAFNOSUPPORT);
244 }
245
246 /*
247 * Add local net header. If no space in first mbuf,
248 * allocate another.
249 */
f23061d4 250
74f1caca 251 M_PREPEND(m, ISO88025_HDR_LEN + rif_len, MB_DONTWAIT);
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252 if (m == NULL)
253 return (ENOBUFS);
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254
255 /* Copy as much of the generic header as is needed into the mbuf */
256 th = mtod(m, struct iso88025_header *);
257 memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
258
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259 /*
260 * If a simplex interface, and the packet is being sent to our
261 * Ethernet address or a broadcast address, loopback a copy.
262 * XXX To make a simplex device behave exactly like a duplex
263 * device, we should copy in the case of sending to our own
264 * ethernet address (thus letting the original actually appear
265 * on the wire). However, we don't do that here for security
266 * reasons and compatibility with the original behavior.
267 */
268 if ((ifp->if_flags & IFF_SIMPLEX) &&
269 (loop_copy != -1)) {
270 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
271 struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
272
273 if_simloop(ifp, n, dst->sa_family, ISO88025_HDR_LEN);
274 } else if (bcmp(th->iso88025_dhost,
275 th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
276 if_simloop(ifp, m, dst->sa_family, ISO88025_HDR_LEN);
277 return (0); /* XXX */
278 }
279 }
280
281 s = splimp();
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282 /*
283 * Queue message on interface, and start output if interface
284 * not yet active.
285 */
286 if (IF_QFULL(&ifp->if_snd)) {
f23061d4 287 printf("iso88025_output: packet dropped QFULL.\n");
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288 IF_DROP(&ifp->if_snd);
289 splx(s);
290 senderr(ENOBUFS);
291 }
292 if (m->m_flags & M_MCAST)
293 ifp->if_omcasts++;
294 IF_ENQUEUE(&ifp->if_snd, m);
f23061d4 295 if (!(ifp->if_flags & IFF_OACTIVE))
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296 (*ifp->if_start)(ifp);
297 splx(s);
298 ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
299 return (error);
300
301bad:
0c3c561c 302 m_freem(m);
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303 return (error);
304}
305
306/*
307 * ISO 88025 de-encapsulation
308 */
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309static void
310iso88025_input(struct ifnet *ifp, struct mbuf *m)
984263bc 311{
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312 struct llc *l;
313 struct iso88025_header *th = mtod(m, struct iso88025_header *);
314 int isr, hdr_len;
984263bc 315 u_short ether_type;
984263bc 316
f23061d4 317 if (!(ifp->if_flags & IFF_UP)) {
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318 m_freem(m);
319 return;
320 }
321
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322 hdr_len = ISO88025_HDR_LEN;
323 if (th->iso88025_shost[0] & 0x80)
324 hdr_len += (ntohs(th->rcf) & 0x1f00) >> 8;
325
326 if (m->m_len < hdr_len) {
327 m_freem(m);
328 return;
329 }
330 m->m_pkthdr.len -= hdr_len;
331 m->m_len -= hdr_len;
332 m->m_data += hdr_len;
333
334 l = mtod(m, struct llc *);
335
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336 switch (l->llc_control) {
337 case LLC_UI:
338 break;
339 case LLC_TEST:
340 case LLC_TEST_P:
341 {
342 struct sockaddr sa;
343 struct arpcom *ac = (struct arpcom *)ifp;
344 struct iso88025_sockaddr_data *th2;
345 int i;
346 u_char c = l->llc_dsap;
347
348 if (th->iso88025_shost[0] & TR_RII) { /* XXX */
349 printf("iso88025_input: dropping source routed LLC_TEST\n");
350 m_free(m);
351 return;
352 }
353 l->llc_dsap = l->llc_ssap;
354 l->llc_ssap = c;
355 if (m->m_flags & (M_BCAST | M_MCAST))
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356 bcopy(ac->ac_enaddr, th->iso88025_dhost,
357 ISO88025_ADDR_LEN);
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358 sa.sa_family = AF_UNSPEC;
359 sa.sa_len = sizeof(sa);
360 th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
361 for (i = 0; i < ISO88025_ADDR_LEN; i++) {
362 th2->ether_shost[i] = c = th->iso88025_dhost[i];
363 th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
364 th->iso88025_shost[i] = c;
365 }
366 th2->ac = TR_AC;
367 th2->fc = TR_LLC_FRAME;
368 ifp->if_output(ifp, m, &sa, NULL);
369 return;
370 }
371 default:
372 printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
373 m_freem(m);
374 return;
375 }
376
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377 m->m_pkthdr.len -= 8;
378 m->m_len -= 8;
379 m->m_data += 8; /* Length of LLC header in our case */
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380
381 ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
382 if (th->iso88025_dhost[0] & 1) {
c401f0fd
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383 if (bcmp(ifp->if_broadcastaddr, th->iso88025_dhost,
384 ifp->if_addrlen) == 0)
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385 m->m_flags |= M_BCAST;
386 else
387 m->m_flags |= M_MCAST;
f23061d4 388 }
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389 if (m->m_flags & (M_BCAST|M_MCAST))
390 ifp->if_imcasts++;
391
392 ether_type = ntohs(l->llc_un.type_snap.ether_type);
393
394 switch (ether_type) {
395#ifdef INET
396 case ETHERTYPE_IP:
f23061d4 397 th->iso88025_shost[0] &= ~(TR_RII);
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398 if (ipflow_fastforward(m))
399 return;
8bde602d 400 isr = NETISR_IP;
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401 break;
402
403 case ETHERTYPE_ARP:
404 if (ifp->if_flags & IFF_NOARP) {
405 m_freem(m);
406 return;
407 }
8bde602d 408 isr = NETISR_ARP;
f23061d4 409 break;
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410#endif
411 default:
412 m_freem(m);
413 return;
414 }
415
8bde602d 416 netisr_dispatch(isr, m);
984263bc 417}