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_natm.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/module.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
51 #include <sys/errno.h>
52 #include <sys/sysctl.h>
53 #include <sys/malloc.h>
54
55 #include <net/if.h>
56 #include <net/if_var.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 static 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 * "ro" = 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 * ro->ro_rt must also be NULL.
123 */
124 int
atm_output(struct ifnet * ifp,struct mbuf * m0,const struct sockaddr * dst,struct route * ro)125 atm_output(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
126 struct route *ro)
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 const struct atmllc *llc_hdr = NULL;
134 u_int32_t atm_flags;
135
136 #ifdef MAC
137 error = mac_ifnet_check_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 if (dst->sa_family == AF_INET6)
157 etype = ETHERTYPE_IPV6;
158 else
159 etype = ETHERTYPE_IP;
160 if (!atmresolve(ro->ro_rt, m, dst, &atmdst)) {
161 m = NULL;
162 /* XXX: atmresolve already free'd it */
163 senderr(EHOSTUNREACH);
164 /* XXX: put ATMARP stuff here */
165 /* XXX: watch who frees m on failure */
166 }
167 }
168 break;
169 #endif /* INET || INET6 */
170
171 case AF_UNSPEC:
172 /*
173 * XXX: bpfwrite. assuming dst contains 12 bytes
174 * (atm pseudo header (4) + LLC/SNAP (8))
175 */
176 bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
177 llc_hdr = (const struct atmllc *)(dst->sa_data +
178 sizeof(atmdst));
179 break;
180
181 default:
182 printf("%s: can't handle af%d\n", ifp->if_xname,
183 dst->sa_family);
184 senderr(EAFNOSUPPORT);
185 }
186
187 /*
188 * must add atm_pseudohdr to data
189 */
190 sz = sizeof(atmdst);
191 atm_flags = ATM_PH_FLAGS(&atmdst);
192 if (atm_flags & ATM_PH_LLCSNAP)
193 sz += 8; /* sizeof snap == 8 */
194 M_PREPEND(m, sz, M_NOWAIT);
195 if (m == 0)
196 senderr(ENOBUFS);
197 ad = mtod(m, struct atm_pseudohdr *);
198 *ad = atmdst;
199 if (atm_flags & ATM_PH_LLCSNAP) {
200 atmllc = (struct atmllc *)(ad + 1);
201 if (llc_hdr == NULL) {
202 bcopy(ATMLLC_HDR, atmllc->llchdr,
203 sizeof(atmllc->llchdr));
204 /* note: in host order */
205 ATM_LLC_SETTYPE(atmllc, etype);
206 }
207 else
208 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
209 }
210 }
211
212 if (ng_atm_output_p != NULL) {
213 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
214 if (m != NULL)
215 m_freem(m);
216 return (error);
217 }
218 if (m == NULL)
219 return (0);
220 }
221
222 /*
223 * Queue message on interface, and start output if interface
224 * not yet active.
225 */
226 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
227 -(int)sizeof(struct atm_pseudohdr)))
228 return (ENOBUFS);
229 return (error);
230
231 bad:
232 if (m)
233 m_freem(m);
234 return (error);
235 }
236
237 /*
238 * Process a received ATM packet;
239 * the packet is in the mbuf chain m.
240 */
241 void
atm_input(struct ifnet * ifp,struct atm_pseudohdr * ah,struct mbuf * m,void * rxhand)242 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
243 void *rxhand)
244 {
245 int isr;
246 u_int16_t etype = ETHERTYPE_IP; /* default */
247
248 if ((ifp->if_flags & IFF_UP) == 0) {
249 m_freem(m);
250 return;
251 }
252 #ifdef MAC
253 mac_ifnet_create_mbuf(ifp, m);
254 #endif
255 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
256
257 if (ng_atm_input_p != NULL) {
258 (*ng_atm_input_p)(ifp, &m, ah, rxhand);
259 if (m == NULL)
260 return;
261 }
262
263 /* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
264 if (atm_harp_input_p != NULL) {
265 (*atm_harp_input_p)(ifp, &m, ah, rxhand);
266 if (m == NULL)
267 return;
268 }
269
270 if (rxhand) {
271 #ifdef NATM
272 struct natmpcb *npcb;
273
274 /*
275 * XXXRW: this use of 'rxhand' is not a very good idea, and
276 * was subject to races even before SMPng due to the release
277 * of spl here.
278 */
279 NATM_LOCK();
280 npcb = rxhand;
281 npcb->npcb_inq++; /* count # in queue */
282 isr = NETISR_NATM;
283 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
284 NATM_UNLOCK();
285 #else
286 printf("atm_input: NATM detected but not "
287 "configured in kernel\n");
288 goto dropit;
289 #endif
290 } else {
291 /*
292 * handle LLC/SNAP header, if present
293 */
294 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
295 struct atmllc *alc;
296
297 if (m->m_len < sizeof(*alc) &&
298 (m = m_pullup(m, sizeof(*alc))) == 0)
299 return; /* failed */
300 alc = mtod(m, struct atmllc *);
301 if (bcmp(alc, ATMLLC_HDR, 6)) {
302 printf("%s: recv'd invalid LLC/SNAP frame "
303 "[vp=%d,vc=%d]\n", ifp->if_xname,
304 ATM_PH_VPI(ah), ATM_PH_VCI(ah));
305 m_freem(m);
306 return;
307 }
308 etype = ATM_LLC_TYPE(alc);
309 m_adj(m, sizeof(*alc));
310 }
311
312 switch (etype) {
313
314 #ifdef INET
315 case ETHERTYPE_IP:
316 isr = NETISR_IP;
317 break;
318 #endif
319
320 #ifdef INET6
321 case ETHERTYPE_IPV6:
322 isr = NETISR_IPV6;
323 break;
324 #endif
325 default:
326 #ifndef NATM
327 dropit:
328 #endif
329 if (ng_atm_input_orphan_p != NULL)
330 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand);
331 else
332 m_freem(m);
333 return;
334 }
335 }
336 M_SETFIB(m, ifp->if_fib);
337 netisr_dispatch(isr, m);
338 }
339
340 /*
341 * Perform common duties while attaching to interface list.
342 */
343 void
atm_ifattach(struct ifnet * ifp)344 atm_ifattach(struct ifnet *ifp)
345 {
346 struct ifaddr *ifa;
347 struct sockaddr_dl *sdl;
348 struct ifatm *ifatm = ifp->if_l2com;
349
350 ifp->if_addrlen = 0;
351 ifp->if_hdrlen = 0;
352 if_attach(ifp);
353 ifp->if_mtu = ATMMTU;
354 ifp->if_output = atm_output;
355 #if 0
356 ifp->if_input = atm_input;
357 #endif
358 ifp->if_snd.ifq_maxlen = 50; /* dummy */
359
360 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
361 if (ifa->ifa_addr->sa_family == AF_LINK) {
362 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
363 sdl->sdl_type = IFT_ATM;
364 sdl->sdl_alen = ifp->if_addrlen;
365 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
366 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
367 #endif
368 break;
369 }
370
371 ifp->if_linkmib = &ifatm->mib;
372 ifp->if_linkmiblen = sizeof(ifatm->mib);
373
374 if(ng_atm_attach_p)
375 (*ng_atm_attach_p)(ifp);
376 if (atm_harp_attach_p)
377 (*atm_harp_attach_p)(ifp);
378 }
379
380 /*
381 * Common stuff for detaching an ATM interface
382 */
383 void
atm_ifdetach(struct ifnet * ifp)384 atm_ifdetach(struct ifnet *ifp)
385 {
386 if (atm_harp_detach_p)
387 (*atm_harp_detach_p)(ifp);
388 if(ng_atm_detach_p)
389 (*ng_atm_detach_p)(ifp);
390 if_detach(ifp);
391 }
392
393 /*
394 * Support routine for the SIOCATMGVCCS ioctl().
395 *
396 * This routine assumes, that the private VCC structures used by the driver
397 * begin with a struct atmio_vcc.
398 *
399 * Return a table of VCCs in a freshly allocated memory area.
400 * Here we have a problem: we first count, how many vccs we need
401 * to return. The we allocate the memory and finally fill it in.
402 * Because we cannot lock while calling malloc, the number of active
403 * vccs may change while we're in malloc. So we allocate a couple of
404 * vccs more and if space anyway is not enough re-iterate.
405 *
406 * We could use an sx lock for the vcc tables.
407 */
408 struct atmio_vcctable *
atm_getvccs(struct atmio_vcc ** table,u_int size,u_int start,struct mtx * lock,int waitok)409 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
410 struct mtx *lock, int waitok)
411 {
412 u_int cid, alloc;
413 size_t len;
414 struct atmio_vcctable *vccs;
415 struct atmio_vcc *v;
416
417 alloc = start + 10;
418 vccs = NULL;
419
420 for (;;) {
421 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
422 vccs = reallocf(vccs, len, M_TEMP,
423 waitok ? M_WAITOK : M_NOWAIT);
424 if (vccs == NULL)
425 return (NULL);
426 bzero(vccs, len);
427
428 vccs->count = 0;
429 v = vccs->vccs;
430
431 mtx_lock(lock);
432 for (cid = 0; cid < size; cid++)
433 if (table[cid] != NULL) {
434 if (++vccs->count == alloc)
435 /* too many - try again */
436 break;
437 *v++ = *table[cid];
438 }
439 mtx_unlock(lock);
440
441 if (cid == size)
442 break;
443
444 alloc *= 2;
445 }
446 return (vccs);
447 }
448
449 /*
450 * Driver or channel state has changed. Inform whoever is interested
451 * in these events.
452 */
453 void
atm_event(struct ifnet * ifp,u_int event,void * arg)454 atm_event(struct ifnet *ifp, u_int event, void *arg)
455 {
456 if (ng_atm_event_p != NULL)
457 (*ng_atm_event_p)(ifp, event, arg);
458 if (atm_harp_event_p != NULL)
459 (*atm_harp_event_p)(ifp, event, arg);
460 }
461
462 static void *
atm_alloc(u_char type,struct ifnet * ifp)463 atm_alloc(u_char type, struct ifnet *ifp)
464 {
465 struct ifatm *ifatm;
466
467 ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO);
468 ifatm->ifp = ifp;
469
470 return (ifatm);
471 }
472
473 static void
atm_free(void * com,u_char type)474 atm_free(void *com, u_char type)
475 {
476
477 free(com, M_IFATM);
478 }
479
480 static int
atm_modevent(module_t mod,int type,void * data)481 atm_modevent(module_t mod, int type, void *data)
482 {
483 switch (type) {
484 case MOD_LOAD:
485 if_register_com_alloc(IFT_ATM, atm_alloc, atm_free);
486 break;
487 case MOD_UNLOAD:
488 if_deregister_com_alloc(IFT_ATM);
489 break;
490 default:
491 return (EOPNOTSUPP);
492 }
493
494 return (0);
495 }
496
497 static moduledata_t atm_mod = {
498 "atm",
499 atm_modevent,
500 0
501 };
502
503 DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
504 MODULE_VERSION(atm, 1);
505