if_atmsubr.c revision 121816 
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: head/sys/net/if_atmsubr.c 121816 2003-10-31 18:32:15Z brooks $");
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 */
81void	(*ng_atm_attach_p)(struct ifnet *);
82void	(*ng_atm_detach_p)(struct ifnet *);
83int	(*ng_atm_output_p)(struct ifnet *, struct mbuf **);
84void	(*ng_atm_input_p)(struct ifnet *, struct mbuf **,
85	    struct atm_pseudohdr *, void *);
86void	(*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
87	    struct atm_pseudohdr *, void *);
88void	(*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
89
90/*
91 * Harp pseudo interface hooks
92 */
93void	(*atm_harp_input_p)(struct ifnet *ifp, struct mbuf **m,
94	    struct atm_pseudohdr *ah, void *rxhand);
95void	(*atm_harp_attach_p)(struct ifnet *);
96void	(*atm_harp_detach_p)(struct ifnet *);
97void	(*atm_harp_event_p)(struct ifnet *, uint32_t, void *);
98
99SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
100
101#ifndef ETHERTYPE_IPV6
102#define	ETHERTYPE_IPV6	0x86dd
103#endif
104
105#define	senderr(e) do { error = (e); goto bad; } while (0)
106
107/*
108 * atm_output: ATM output routine
109 *   inputs:
110 *     "ifp" = ATM interface to output to
111 *     "m0" = the packet to output
112 *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
113 *     "rt0" = the route to use
114 *   returns: error code   [0 == ok]
115 *
116 *   note: special semantic: if (dst == NULL) then we assume "m" already
117 *		has an atm_pseudohdr on it and just send it directly.
118 *		[for native mode ATM output]   if dst is null, then
119 *		rt0 must also be NULL.
120 */
121int
122atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
123    struct rtentry *rt0)
124{
125	u_int16_t etype = 0;			/* if using LLC/SNAP */
126	int error = 0, sz;
127	struct atm_pseudohdr atmdst, *ad;
128	struct mbuf *m = m0;
129	struct rtentry *rt;
130	struct atmllc *atmllc;
131	struct atmllc *llc_hdr = NULL;
132	u_int32_t atm_flags;
133
134#ifdef MAC
135	error = mac_check_ifnet_transmit(ifp, m);
136	if (error)
137		senderr(error);
138#endif
139
140	if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
141		senderr(ENETDOWN);
142
143	/*
144	 * check route
145	 */
146	error = rt_check(&rt, &rt0, dst);
147	if (error)
148		goto bad;
149
150	/*
151	 * check for non-native ATM traffic   (dst != NULL)
152	 */
153	if (dst) {
154		switch (dst->sa_family) {
155
156#if defined(INET) || defined(INET6)
157		case AF_INET:
158		case AF_INET6:
159			if (dst->sa_family == AF_INET6)
160			        etype = ETHERTYPE_IPV6;
161			else
162			        etype = ETHERTYPE_IP;
163			if (!atmresolve(rt, m, dst, &atmdst)) {
164				m = NULL;
165				/* XXX: atmresolve already free'd it */
166				senderr(EHOSTUNREACH);
167				/* XXX: put ATMARP stuff here */
168				/* XXX: watch who frees m on failure */
169			}
170			break;
171#endif /* INET || INET6 */
172
173		case AF_UNSPEC:
174			/*
175			 * XXX: bpfwrite. assuming dst contains 12 bytes
176			 * (atm pseudo header (4) + LLC/SNAP (8))
177			 */
178			bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
179			llc_hdr = (struct atmllc *)(dst->sa_data +
180			    sizeof(atmdst));
181			break;
182
183		default:
184#if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \
185    defined(__NetBSD__) || defined(__OpenBSD__)
186			printf("%s: can't handle af%d\n", ifp->if_xname,
187			    dst->sa_family);
188#elif defined(__FreeBSD__) || defined(__bsdi__)
189			printf("%s%d: can't handle af%d\n", ifp->if_name,
190			    ifp->if_unit, dst->sa_family);
191#endif
192			senderr(EAFNOSUPPORT);
193		}
194
195		/*
196		 * must add atm_pseudohdr to data
197		 */
198		sz = sizeof(atmdst);
199		atm_flags = ATM_PH_FLAGS(&atmdst);
200		if (atm_flags & ATM_PH_LLCSNAP)
201			sz += 8;	/* sizeof snap == 8 */
202		M_PREPEND(m, sz, M_DONTWAIT);
203		if (m == 0)
204			senderr(ENOBUFS);
205		ad = mtod(m, struct atm_pseudohdr *);
206		*ad = atmdst;
207		if (atm_flags & ATM_PH_LLCSNAP) {
208			atmllc = (struct atmllc *)(ad + 1);
209			if (llc_hdr == NULL) {
210			        bcopy(ATMLLC_HDR, atmllc->llchdr,
211				      sizeof(atmllc->llchdr));
212				/* note: in host order */
213				ATM_LLC_SETTYPE(atmllc, etype);
214			}
215			else
216			        bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
217		}
218	}
219
220	if (ng_atm_output_p != NULL) {
221		if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
222			if (m != NULL)
223				m_freem(m);
224			return (error);
225		}
226		if (m == NULL)
227			return (0);
228	}
229
230	/*
231	 * Queue message on interface, and start output if interface
232	 * not yet active.
233	 */
234	if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
235	    -(int)sizeof(struct atm_pseudohdr)))
236		return (ENOBUFS);
237	return (error);
238
239bad:
240	if (m)
241		m_freem(m);
242	return (error);
243}
244
245/*
246 * Process a received ATM packet;
247 * the packet is in the mbuf chain m.
248 */
249void
250atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
251    void *rxhand)
252{
253	int isr;
254	u_int16_t etype = ETHERTYPE_IP;		/* default */
255	int s;
256
257	if ((ifp->if_flags & IFF_UP) == 0) {
258		m_freem(m);
259		return;
260	}
261#ifdef MAC
262	mac_create_mbuf_from_ifnet(ifp, m);
263#endif
264	ifp->if_ibytes += m->m_pkthdr.len;
265
266	if (ng_atm_input_p != NULL) {
267		(*ng_atm_input_p)(ifp, &m, ah, rxhand);
268		if (m == NULL)
269			return;
270	}
271
272	/* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
273	if (atm_harp_input_p != NULL) {
274		(*atm_harp_input_p)(ifp, &m, ah, rxhand);
275		if (m == NULL)
276			return;
277	}
278
279	if (rxhand) {
280#ifdef NATM
281		struct natmpcb *npcb = rxhand;
282
283		s = splimp();		/* in case 2 atm cards @ diff lvls */
284		npcb->npcb_inq++;	/* count # in queue */
285		splx(s);
286		isr = NETISR_NATM;
287		m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
288#else
289		printf("atm_input: NATM detected but not "
290		    "configured in kernel\n");
291		goto dropit;
292#endif
293	} else {
294		/*
295		 * handle LLC/SNAP header, if present
296		 */
297		if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
298			struct atmllc *alc;
299
300			if (m->m_len < sizeof(*alc) &&
301			    (m = m_pullup(m, sizeof(*alc))) == 0)
302				return; /* failed */
303			alc = mtod(m, struct atmllc *);
304			if (bcmp(alc, ATMLLC_HDR, 6)) {
305#if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \
306    defined(__NetBSD__) || defined(__OpenBSD__)
307				printf("%s: recv'd invalid LLC/SNAP frame "
308				    "[vp=%d,vc=%d]\n", ifp->if_xname,
309				    ATM_PH_VPI(ah), ATM_PH_VCI(ah));
310#elif defined(__FreeBSD__) || defined(__bsdi__)
311				printf("%s%d: recv'd invalid LLC/SNAP frame "
312				    "[vp=%d,vc=%d]\n", ifp->if_name,
313				    ifp->if_unit, ATM_PH_VPI(ah),
314				    ATM_PH_VCI(ah));
315#endif
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 */
353void
354atm_ifattach(struct ifnet *ifp)
355{
356	struct ifaddr *ifa;
357	struct sockaddr_dl *sdl;
358	struct ifatm *ifatm = ifp->if_softc;
359
360	ifp->if_type = IFT_ATM;
361	ifp->if_addrlen = 0;
362	ifp->if_hdrlen = 0;
363	if_attach(ifp);
364	ifp->if_mtu = ATMMTU;
365	ifp->if_output = atm_output;
366#if 0
367	ifp->if_input = atm_input;
368#endif
369	ifp->if_snd.ifq_maxlen = 50;	/* dummy */
370
371#if defined(__NetBSD__) || defined(__OpenBSD__)
372	TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
373#elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
374	for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
375	    ifa = TAILQ_NEXT(ifa, ifa_link))
376#elif defined(__FreeBSD__) || defined(__bsdi__)
377	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
378#endif
379		if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
380		    sdl->sdl_family == AF_LINK) {
381			sdl->sdl_type = IFT_ATM;
382			sdl->sdl_alen = ifp->if_addrlen;
383#ifdef notyet /* if using ATMARP, store hardware address using the next line */
384			bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
385#endif
386			break;
387		}
388
389	ifp->if_linkmib = &ifatm->mib;
390	ifp->if_linkmiblen = sizeof(ifatm->mib);
391
392	if(ng_atm_attach_p)
393		(*ng_atm_attach_p)(ifp);
394	if (atm_harp_attach_p)
395		(*atm_harp_attach_p)(ifp);
396}
397
398/*
399 * Common stuff for detaching an ATM interface
400 */
401void
402atm_ifdetach(struct ifnet *ifp)
403{
404	if (atm_harp_detach_p)
405		(*atm_harp_detach_p)(ifp);
406	if(ng_atm_detach_p)
407		(*ng_atm_detach_p)(ifp);
408	if_detach(ifp);
409}
410
411/*
412 * Support routine for the SIOCATMGVCCS ioctl().
413 *
414 * This routine assumes, that the private VCC structures used by the driver
415 * begin with a struct atmio_vcc.
416 *
417 * Return a table of VCCs in a freshly allocated memory area.
418 * Here we have a problem: we first count, how many vccs we need
419 * to return. The we allocate the memory and finally fill it in.
420 * Because we cannot lock while calling malloc, the number of active
421 * vccs may change while we're in malloc. So we allocate a couple of
422 * vccs more and if space anyway is not enough re-iterate.
423 *
424 * We could use an sx lock for the vcc tables.
425 */
426struct atmio_vcctable *
427atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
428    struct mtx *lock, int waitok)
429{
430	u_int cid, alloc;
431	size_t len;
432	struct atmio_vcctable *vccs;
433	struct atmio_vcc *v;
434
435	alloc = start + 10;
436	vccs = NULL;
437
438	for (;;) {
439		len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
440		vccs = reallocf(vccs, len, M_TEMP,
441		    waitok ? M_WAITOK : M_NOWAIT);
442		if (vccs == NULL)
443			return (NULL);
444		bzero(vccs, len);
445
446		vccs->count = 0;
447		v = vccs->vccs;
448
449		mtx_lock(lock);
450		for (cid = 0; cid < size; cid++)
451			if (table[cid] != NULL) {
452				if (++vccs->count == alloc)
453					/* too many - try again */
454					break;
455				*v++ = *table[cid];
456			}
457		mtx_unlock(lock);
458
459		if (cid == size)
460			break;
461
462		alloc *= 2;
463	}
464	return (vccs);
465}
466
467/*
468 * Driver or channel state has changed. Inform whoever is interested
469 * in these events.
470 */
471void
472atm_event(struct ifnet *ifp, u_int event, void *arg)
473{
474	if (ng_atm_event_p != NULL)
475		(*ng_atm_event_p)(ifp, event, arg);
476	if (atm_harp_event_p != NULL)
477		(*atm_harp_event_p)(ifp, event, arg);
478}
479
480static moduledata_t atm_mod = {
481        "atm",
482        NULL,
483        0
484};
485
486DECLARE_MODULE(atm, atm_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
487MODULE_VERSION(atm, 1);
488