FreeBSD/Linux Kernel Cross Reference
sys/net/if_atmsubr.c
1 /* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */
2
3 /*-
4 *
5 * Copyright (c) 1996 Charles D. Cranor and Washington University.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Charles D. Cranor and
19 * Washington University.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * if_atmsubr.c
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include "opt_inet.h"
41 #include "opt_inet6.h"
42 #include "opt_mac.h"
43 #include "opt_natm.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/module.h>
49 #include <sys/mac.h>
50 #include <sys/mbuf.h>
51 #include <sys/socket.h>
52 #include <sys/sockio.h>
53 #include <sys/errno.h>
54 #include <sys/sysctl.h>
55 #include <sys/malloc.h>
56
57 #include <net/if.h>
58 #include <net/netisr.h>
59 #include <net/route.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_atm.h>
63
64 #include <netinet/in.h>
65 #include <netinet/if_atm.h>
66 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
67 #if defined(INET) || defined(INET6)
68 #include <netinet/in_var.h>
69 #endif
70 #ifdef NATM
71 #include <netnatm/natm.h>
72 #endif
73
74 /*
75 * Netgraph interface functions.
76 * These need not be protected by a lock, because ng_atm nodes are persitent.
77 * The ng_atm module can be unloaded only if all ATM interfaces have been
78 * unloaded, so nobody should be in the code paths accessing these function
79 * pointers.
80 */
81 void (*ng_atm_attach_p)(struct ifnet *);
82 void (*ng_atm_detach_p)(struct ifnet *);
83 int (*ng_atm_output_p)(struct ifnet *, struct mbuf **);
84 void (*ng_atm_input_p)(struct ifnet *, struct mbuf **,
85 struct atm_pseudohdr *, void *);
86 void (*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
87 struct atm_pseudohdr *, void *);
88 void (*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
89
90 /*
91 * Harp pseudo interface hooks
92 */
93 void (*atm_harp_input_p)(struct ifnet *ifp, struct mbuf **m,
94 struct atm_pseudohdr *ah, void *rxhand);
95 void (*atm_harp_attach_p)(struct ifnet *);
96 void (*atm_harp_detach_p)(struct ifnet *);
97 void (*atm_harp_event_p)(struct ifnet *, uint32_t, void *);
98
99 SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
100
101 MALLOC_DEFINE(M_IFATM, "ifatm", "atm interface internals");
102
103 #ifndef ETHERTYPE_IPV6
104 #define ETHERTYPE_IPV6 0x86dd
105 #endif
106
107 #define senderr(e) do { error = (e); goto bad; } while (0)
108
109 /*
110 * atm_output: ATM output routine
111 * inputs:
112 * "ifp" = ATM interface to output to
113 * "m0" = the packet to output
114 * "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
115 * "rt0" = the route to use
116 * returns: error code [0 == ok]
117 *
118 * note: special semantic: if (dst == NULL) then we assume "m" already
119 * has an atm_pseudohdr on it and just send it directly.
120 * [for native mode ATM output] if dst is null, then
121 * rt0 must also be NULL.
122 */
123 int
124 atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
125 struct rtentry *rt0)
126 {
127 u_int16_t etype = 0; /* if using LLC/SNAP */
128 int error = 0, sz;
129 struct atm_pseudohdr atmdst, *ad;
130 struct mbuf *m = m0;
131 struct atmllc *atmllc;
132 struct atmllc *llc_hdr = NULL;
133 u_int32_t atm_flags;
134
135 #ifdef MAC
136 error = mac_check_ifnet_transmit(ifp, m);
137 if (error)
138 senderr(error);
139 #endif
140
141 if (!((ifp->if_flags & IFF_UP) &&
142 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
143 senderr(ENETDOWN);
144
145 /*
146 * check for non-native ATM traffic (dst != NULL)
147 */
148 if (dst) {
149 switch (dst->sa_family) {
150
151 #if defined(INET) || defined(INET6)
152 case AF_INET:
153 case AF_INET6:
154 {
155 struct rtentry *rt = NULL;
156 /*
157 * check route
158 */
159 if (rt0 != NULL) {
160 error = rt_check(&rt, &rt0, dst);
161 if (error)
162 goto bad;
163 RT_UNLOCK(rt);
164 }
165
166 if (dst->sa_family == AF_INET6)
167 etype = ETHERTYPE_IPV6;
168 else
169 etype = ETHERTYPE_IP;
170 if (!atmresolve(rt, m, dst, &atmdst)) {
171 m = NULL;
172 /* XXX: atmresolve already free'd it */
173 senderr(EHOSTUNREACH);
174 /* XXX: put ATMARP stuff here */
175 /* XXX: watch who frees m on failure */
176 }
177 }
178 break;
179 #endif /* INET || INET6 */
180
181 case AF_UNSPEC:
182 /*
183 * XXX: bpfwrite. assuming dst contains 12 bytes
184 * (atm pseudo header (4) + LLC/SNAP (8))
185 */
186 bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
187 llc_hdr = (struct atmllc *)(dst->sa_data +
188 sizeof(atmdst));
189 break;
190
191 default:
192 #if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \
193 defined(__NetBSD__) || defined(__OpenBSD__)
194 printf("%s: can't handle af%d\n", ifp->if_xname,
195 dst->sa_family);
196 #elif defined(__FreeBSD__) || defined(__bsdi__)
197 printf("%s%d: can't handle af%d\n", ifp->if_name,
198 ifp->if_unit, dst->sa_family);
199 #endif
200 senderr(EAFNOSUPPORT);
201 }
202
203 /*
204 * must add atm_pseudohdr to data
205 */
206 sz = sizeof(atmdst);
207 atm_flags = ATM_PH_FLAGS(&atmdst);
208 if (atm_flags & ATM_PH_LLCSNAP)
209 sz += 8; /* sizeof snap == 8 */
210 M_PREPEND(m, sz, M_DONTWAIT);
211 if (m == 0)
212 senderr(ENOBUFS);
213 ad = mtod(m, struct atm_pseudohdr *);
214 *ad = atmdst;
215 if (atm_flags & ATM_PH_LLCSNAP) {
216 atmllc = (struct atmllc *)(ad + 1);
217 if (llc_hdr == NULL) {
218 bcopy(ATMLLC_HDR, atmllc->llchdr,
219 sizeof(atmllc->llchdr));
220 /* note: in host order */
221 ATM_LLC_SETTYPE(atmllc, etype);
222 }
223 else
224 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
225 }
226 }
227
228 if (ng_atm_output_p != NULL) {
229 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
230 if (m != NULL)
231 m_freem(m);
232 return (error);
233 }
234 if (m == NULL)
235 return (0);
236 }
237
238 /*
239 * Queue message on interface, and start output if interface
240 * not yet active.
241 */
242 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
243 -(int)sizeof(struct atm_pseudohdr)))
244 return (ENOBUFS);
245 return (error);
246
247 bad:
248 if (m)
249 m_freem(m);
250 return (error);
251 }
252
253 /*
254 * Process a received ATM packet;
255 * the packet is in the mbuf chain m.
256 */
257 void
258 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
259 void *rxhand)
260 {
261 int isr;
262 u_int16_t etype = ETHERTYPE_IP; /* default */
263
264 if ((ifp->if_flags & IFF_UP) == 0) {
265 m_freem(m);
266 return;
267 }
268 #ifdef MAC
269 mac_create_mbuf_from_ifnet(ifp, m);
270 #endif
271 ifp->if_ibytes += m->m_pkthdr.len;
272
273 if (ng_atm_input_p != NULL) {
274 (*ng_atm_input_p)(ifp, &m, ah, rxhand);
275 if (m == NULL)
276 return;
277 }
278
279 /* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
280 if (atm_harp_input_p != NULL) {
281 (*atm_harp_input_p)(ifp, &m, ah, rxhand);
282 if (m == NULL)
283 return;
284 }
285
286 if (rxhand) {
287 #ifdef NATM
288 struct natmpcb *npcb;
289
290 /*
291 * XXXRW: this use of 'rxhand' is not a very good idea, and
292 * was subject to races even before SMPng due to the release
293 * of spl here.
294 */
295 NATM_LOCK();
296 npcb = rxhand;
297 npcb->npcb_inq++; /* count # in queue */
298 isr = NETISR_NATM;
299 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
300 NATM_UNLOCK();
301 #else
302 printf("atm_input: NATM detected but not "
303 "configured in kernel\n");
304 goto dropit;
305 #endif
306 } else {
307 /*
308 * handle LLC/SNAP header, if present
309 */
310 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
311 struct atmllc *alc;
312
313 if (m->m_len < sizeof(*alc) &&
314 (m = m_pullup(m, sizeof(*alc))) == 0)
315 return; /* failed */
316 alc = mtod(m, struct atmllc *);
317 if (bcmp(alc, ATMLLC_HDR, 6)) {
318 #if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \
319 defined(__NetBSD__) || defined(__OpenBSD__)
320 printf("%s: recv'd invalid LLC/SNAP frame "
321 "[vp=%d,vc=%d]\n", ifp->if_xname,
322 ATM_PH_VPI(ah), ATM_PH_VCI(ah));
323 #elif defined(__FreeBSD__) || defined(__bsdi__)
324 printf("%s%d: recv'd invalid LLC/SNAP frame "
325 "[vp=%d,vc=%d]\n", ifp->if_name,
326 ifp->if_unit, ATM_PH_VPI(ah),
327 ATM_PH_VCI(ah));
328 #endif
329 m_freem(m);
330 return;
331 }
332 etype = ATM_LLC_TYPE(alc);
333 m_adj(m, sizeof(*alc));
334 }
335
336 switch (etype) {
337
338 #ifdef INET
339 case ETHERTYPE_IP:
340 isr = NETISR_IP;
341 break;
342 #endif
343
344 #ifdef INET6
345 case ETHERTYPE_IPV6:
346 isr = NETISR_IPV6;
347 break;
348 #endif
349 default:
350 #ifndef NATM
351 dropit:
352 #endif
353 if (ng_atm_input_orphan_p != NULL)
354 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand);
355 else
356 m_freem(m);
357 return;
358 }
359 }
360 netisr_dispatch(isr, m);
361 }
362
363 /*
364 * Perform common duties while attaching to interface list.
365 */
366 void
367 atm_ifattach(struct ifnet *ifp)
368 {
369 struct ifaddr *ifa;
370 struct sockaddr_dl *sdl;
371 struct ifatm *ifatm = ifp->if_l2com;
372
373 ifp->if_addrlen = 0;
374 ifp->if_hdrlen = 0;
375 if_attach(ifp);
376 ifp->if_mtu = ATMMTU;
377 ifp->if_output = atm_output;
378 #if 0
379 ifp->if_input = atm_input;
380 #endif
381 ifp->if_snd.ifq_maxlen = 50; /* dummy */
382
383 #if defined(__NetBSD__) || defined(__OpenBSD__)
384 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
385 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
386 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
387 ifa = TAILQ_NEXT(ifa, ifa_link))
388 #elif defined(__FreeBSD__) || defined(__bsdi__)
389 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
390 #endif
391 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
392 sdl->sdl_family == AF_LINK) {
393 sdl->sdl_type = IFT_ATM;
394 sdl->sdl_alen = ifp->if_addrlen;
395 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
396 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
397 #endif
398 break;
399 }
400
401 ifp->if_linkmib = &ifatm->mib;
402 ifp->if_linkmiblen = sizeof(ifatm->mib);
403
404 if(ng_atm_attach_p)
405 (*ng_atm_attach_p)(ifp);
406 if (atm_harp_attach_p)
407 (*atm_harp_attach_p)(ifp);
408 }
409
410 /*
411 * Common stuff for detaching an ATM interface
412 */
413 void
414 atm_ifdetach(struct ifnet *ifp)
415 {
416 if (atm_harp_detach_p)
417 (*atm_harp_detach_p)(ifp);
418 if(ng_atm_detach_p)
419 (*ng_atm_detach_p)(ifp);
420 if_detach(ifp);
421 }
422
423 /*
424 * Support routine for the SIOCATMGVCCS ioctl().
425 *
426 * This routine assumes, that the private VCC structures used by the driver
427 * begin with a struct atmio_vcc.
428 *
429 * Return a table of VCCs in a freshly allocated memory area.
430 * Here we have a problem: we first count, how many vccs we need
431 * to return. The we allocate the memory and finally fill it in.
432 * Because we cannot lock while calling malloc, the number of active
433 * vccs may change while we're in malloc. So we allocate a couple of
434 * vccs more and if space anyway is not enough re-iterate.
435 *
436 * We could use an sx lock for the vcc tables.
437 */
438 struct atmio_vcctable *
439 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
440 struct mtx *lock, int waitok)
441 {
442 u_int cid, alloc;
443 size_t len;
444 struct atmio_vcctable *vccs;
445 struct atmio_vcc *v;
446
447 alloc = start + 10;
448 vccs = NULL;
449
450 for (;;) {
451 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
452 vccs = reallocf(vccs, len, M_TEMP,
453 waitok ? M_WAITOK : M_NOWAIT);
454 if (vccs == NULL)
455 return (NULL);
456 bzero(vccs, len);
457
458 vccs->count = 0;
459 v = vccs->vccs;
460
461 mtx_lock(lock);
462 for (cid = 0; cid < size; cid++)
463 if (table[cid] != NULL) {
464 if (++vccs->count == alloc)
465 /* too many - try again */
466 break;
467 *v++ = *table[cid];
468 }
469 mtx_unlock(lock);
470
471 if (cid == size)
472 break;
473
474 alloc *= 2;
475 }
476 return (vccs);
477 }
478
479 /*
480 * Driver or channel state has changed. Inform whoever is interested
481 * in these events.
482 */
483 void
484 atm_event(struct ifnet *ifp, u_int event, void *arg)
485 {
486 if (ng_atm_event_p != NULL)
487 (*ng_atm_event_p)(ifp, event, arg);
488 if (atm_harp_event_p != NULL)
489 (*atm_harp_event_p)(ifp, event, arg);
490 }
491
492 static void *
493 atm_alloc(u_char type, struct ifnet *ifp)
494 {
495 struct ifatm *ifatm;
496
497 ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO);
498 ifatm->ifp = ifp;
499
500 return (ifatm);
501 }
502
503 static void
504 atm_free(void *com, u_char type)
505 {
506
507 free(com, M_IFATM);
508 }
509
510 static int
511 atm_modevent(module_t mod, int type, void *data)
512 {
513 switch (type) {
514 case MOD_LOAD:
515 if_register_com_alloc(IFT_ATM, atm_alloc, atm_free);
516 break;
517 case MOD_UNLOAD:
518 if_deregister_com_alloc(IFT_ATM);
519 break;
520 default:
521 return (EOPNOTSUPP);
522 }
523
524 return (0);
525 }
526
527 static moduledata_t atm_mod = {
528 "atm",
529 atm_modevent,
530 0
531 };
532
533 DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
534 MODULE_VERSION(atm, 1);
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