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 */
82void	(*ng_atm_attach_p)(struct ifnet *);
83void	(*ng_atm_detach_p)(struct ifnet *);
84int	(*ng_atm_output_p)(struct ifnet *, struct mbuf **);
85void	(*ng_atm_input_p)(struct ifnet *, struct mbuf **,
86	    struct atm_pseudohdr *, void *);
87void	(*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
88	    struct atm_pseudohdr *, void *);
89void	(*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
90
91/*
92 * Harp pseudo interface hooks
93 */
94void	(*atm_harp_input_p)(struct ifnet *ifp, struct mbuf **m,
95	    struct atm_pseudohdr *ah, void *rxhand);
96void	(*atm_harp_attach_p)(struct ifnet *);
97void	(*atm_harp_detach_p)(struct ifnet *);
98void	(*atm_harp_event_p)(struct ifnet *, uint32_t, void *);
99
100SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
101
102static 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 */
124int
125atm_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 == NULL)
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
231bad:
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 */
241void
242atm_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))) == NULL)
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 */
343void
344atm_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 */
383void
384atm_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 */
408struct atmio_vcctable *
409atm_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 */
453void
454atm_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
462static void *
463atm_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
473static void
474atm_free(void *com, u_char type)
475{
476
477	free(com, M_IFATM);
478}
479
480static int
481atm_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
497static moduledata_t atm_mod = {
498        "atm",
499        atm_modevent,
500        0
501};
502
503DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
504MODULE_VERSION(atm, 1);
505