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