1 /* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */
5 * Copyright (c) 1996 Charles D. Cranor and Washington University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
41 #include "opt_inet6.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/module.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>
56 #include <net/netisr.h>
57 #include <net/route.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
60 #include <net/if_atm.h>
62 #include <netinet/in.h>
63 #include <netinet/if_atm.h>
64 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
65 #if defined(INET) || defined(INET6)
66 #include <netinet/in_var.h>
69 #include <netnatm/natm.h>
72 #include <security/mac/mac_framework.h>
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
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 *);
91 * Harp pseudo interface hooks
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 *);
99 SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
101 MALLOC_DEFINE(M_IFATM, "ifatm", "atm interface internals");
103 #ifndef ETHERTYPE_IPV6
104 #define ETHERTYPE_IPV6 0x86dd
107 #define senderr(e) do { error = (e); goto bad; } while (0)
110 * atm_output: ATM output routine
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 * "ro" = the route to use
116 * returns: error code [0 == ok]
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 * ro->ro_rt must also be NULL.
124 atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
127 u_int16_t etype = 0; /* if using LLC/SNAP */
129 struct atm_pseudohdr atmdst, *ad;
131 struct atmllc *atmllc;
132 struct atmllc *llc_hdr = NULL;
136 error = mac_ifnet_check_transmit(ifp, m);
141 if (!((ifp->if_flags & IFF_UP) &&
142 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
146 * check for non-native ATM traffic (dst != NULL)
149 switch (dst->sa_family) {
151 #if defined(INET) || defined(INET6)
155 if (dst->sa_family == AF_INET6)
156 etype = ETHERTYPE_IPV6;
158 etype = ETHERTYPE_IP;
159 if (!atmresolve(ro->ro_rt, m, dst, &atmdst)) {
161 /* XXX: atmresolve already free'd it */
162 senderr(EHOSTUNREACH);
163 /* XXX: put ATMARP stuff here */
164 /* XXX: watch who frees m on failure */
168 #endif /* INET || INET6 */
172 * XXX: bpfwrite. assuming dst contains 12 bytes
173 * (atm pseudo header (4) + LLC/SNAP (8))
175 bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
176 llc_hdr = (struct atmllc *)(dst->sa_data +
181 printf("%s: can't handle af%d\n", ifp->if_xname,
183 senderr(EAFNOSUPPORT);
187 * must add atm_pseudohdr to data
190 atm_flags = ATM_PH_FLAGS(&atmdst);
191 if (atm_flags & ATM_PH_LLCSNAP)
192 sz += 8; /* sizeof snap == 8 */
193 M_PREPEND(m, sz, M_DONTWAIT);
196 ad = mtod(m, struct atm_pseudohdr *);
198 if (atm_flags & ATM_PH_LLCSNAP) {
199 atmllc = (struct atmllc *)(ad + 1);
200 if (llc_hdr == NULL) {
201 bcopy(ATMLLC_HDR, atmllc->llchdr,
202 sizeof(atmllc->llchdr));
203 /* note: in host order */
204 ATM_LLC_SETTYPE(atmllc, etype);
207 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
211 if (ng_atm_output_p != NULL) {
212 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
222 * Queue message on interface, and start output if interface
225 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
226 -(int)sizeof(struct atm_pseudohdr)))
237 * Process a received ATM packet;
238 * the packet is in the mbuf chain m.
241 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
245 u_int16_t etype = ETHERTYPE_IP; /* default */
247 if ((ifp->if_flags & IFF_UP) == 0) {
252 mac_ifnet_create_mbuf(ifp, m);
254 ifp->if_ibytes += m->m_pkthdr.len;
256 if (ng_atm_input_p != NULL) {
257 (*ng_atm_input_p)(ifp, &m, ah, rxhand);
262 /* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
263 if (atm_harp_input_p != NULL) {
264 (*atm_harp_input_p)(ifp, &m, ah, rxhand);
271 struct natmpcb *npcb;
274 * XXXRW: this use of 'rxhand' is not a very good idea, and
275 * was subject to races even before SMPng due to the release
280 npcb->npcb_inq++; /* count # in queue */
282 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
285 printf("atm_input: NATM detected but not "
286 "configured in kernel\n");
291 * handle LLC/SNAP header, if present
293 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
296 if (m->m_len < sizeof(*alc) &&
297 (m = m_pullup(m, sizeof(*alc))) == 0)
299 alc = mtod(m, struct atmllc *);
300 if (bcmp(alc, ATMLLC_HDR, 6)) {
301 printf("%s: recv'd invalid LLC/SNAP frame "
302 "[vp=%d,vc=%d]\n", ifp->if_xname,
303 ATM_PH_VPI(ah), ATM_PH_VCI(ah));
307 etype = ATM_LLC_TYPE(alc);
308 m_adj(m, sizeof(*alc));
328 if (ng_atm_input_orphan_p != NULL)
329 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand);
335 netisr_dispatch(isr, m);
339 * Perform common duties while attaching to interface list.
342 atm_ifattach(struct ifnet *ifp)
345 struct sockaddr_dl *sdl;
346 struct ifatm *ifatm = ifp->if_l2com;
351 ifp->if_mtu = ATMMTU;
352 ifp->if_output = atm_output;
354 ifp->if_input = atm_input;
356 ifp->if_snd.ifq_maxlen = 50; /* dummy */
358 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
359 if (ifa->ifa_addr->sa_family == AF_LINK) {
360 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
361 sdl->sdl_type = IFT_ATM;
362 sdl->sdl_alen = ifp->if_addrlen;
363 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
364 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
369 ifp->if_linkmib = &ifatm->mib;
370 ifp->if_linkmiblen = sizeof(ifatm->mib);
373 (*ng_atm_attach_p)(ifp);
374 if (atm_harp_attach_p)
375 (*atm_harp_attach_p)(ifp);
379 * Common stuff for detaching an ATM interface
382 atm_ifdetach(struct ifnet *ifp)
384 if (atm_harp_detach_p)
385 (*atm_harp_detach_p)(ifp);
387 (*ng_atm_detach_p)(ifp);
392 * Support routine for the SIOCATMGVCCS ioctl().
394 * This routine assumes, that the private VCC structures used by the driver
395 * begin with a struct atmio_vcc.
397 * Return a table of VCCs in a freshly allocated memory area.
398 * Here we have a problem: we first count, how many vccs we need
399 * to return. The we allocate the memory and finally fill it in.
400 * Because we cannot lock while calling malloc, the number of active
401 * vccs may change while we're in malloc. So we allocate a couple of
402 * vccs more and if space anyway is not enough re-iterate.
404 * We could use an sx lock for the vcc tables.
406 struct atmio_vcctable *
407 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
408 struct mtx *lock, int waitok)
412 struct atmio_vcctable *vccs;
419 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
420 vccs = reallocf(vccs, len, M_TEMP,
421 waitok ? M_WAITOK : M_NOWAIT);
430 for (cid = 0; cid < size; cid++)
431 if (table[cid] != NULL) {
432 if (++vccs->count == alloc)
433 /* too many - try again */
448 * Driver or channel state has changed. Inform whoever is interested
452 atm_event(struct ifnet *ifp, u_int event, void *arg)
454 if (ng_atm_event_p != NULL)
455 (*ng_atm_event_p)(ifp, event, arg);
456 if (atm_harp_event_p != NULL)
457 (*atm_harp_event_p)(ifp, event, arg);
461 atm_alloc(u_char type, struct ifnet *ifp)
465 ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO);
472 atm_free(void *com, u_char type)
479 atm_modevent(module_t mod, int type, void *data)
483 if_register_com_alloc(IFT_ATM, atm_alloc, atm_free);
486 if_deregister_com_alloc(IFT_ATM);
495 static moduledata_t atm_mod = {
501 DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
502 MODULE_VERSION(atm, 1);