if_atmsubr.c revision 148883
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 148883 2005-08-09 08:39:56Z glebius $"); 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 101MALLOC_DEFINE(M_IFATM, "ifatm", "atm interface internals"); 102 103#ifndef ETHERTYPE_IPV6 104#define ETHERTYPE_IPV6 0x86dd 105#endif 106 107#define senderr(e) do { error = (e); goto bad; } while (0) 108 109/* 110 * atm_output: ATM output routine 111 * inputs: 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 * "rt0" = the route to use 116 * returns: error code [0 == ok] 117 * 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 * rt0 must also be NULL. 122 */ 123int 124atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 125 struct rtentry *rt0) 126{ 127 u_int16_t etype = 0; /* if using LLC/SNAP */ 128 int error = 0, sz; 129 struct atm_pseudohdr atmdst, *ad; 130 struct mbuf *m = m0; 131 struct atmllc *atmllc; 132 struct atmllc *llc_hdr = NULL; 133 u_int32_t atm_flags; 134 135#ifdef MAC 136 error = mac_check_ifnet_transmit(ifp, m); 137 if (error) 138 senderr(error); 139#endif 140 141 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 142 senderr(ENETDOWN); 143 144 /* 145 * check for non-native ATM traffic (dst != NULL) 146 */ 147 if (dst) { 148 switch (dst->sa_family) { 149 150#if defined(INET) || defined(INET6) 151 case AF_INET: 152 case AF_INET6: 153 { 154 struct rtentry *rt; 155 /* 156 * check route 157 */ 158 error = rt_check(&rt, &rt0, dst); 159 if (error) 160 goto bad; 161 RT_UNLOCK(rt); 162 163 if (dst->sa_family == AF_INET6) 164 etype = ETHERTYPE_IPV6; 165 else 166 etype = ETHERTYPE_IP; 167 if (!atmresolve(rt, m, dst, &atmdst)) { 168 m = NULL; 169 /* XXX: atmresolve already free'd it */ 170 senderr(EHOSTUNREACH); 171 /* XXX: put ATMARP stuff here */ 172 /* XXX: watch who frees m on failure */ 173 } 174 } 175 break; 176#endif /* INET || INET6 */ 177 178 case AF_UNSPEC: 179 /* 180 * XXX: bpfwrite. assuming dst contains 12 bytes 181 * (atm pseudo header (4) + LLC/SNAP (8)) 182 */ 183 bcopy(dst->sa_data, &atmdst, sizeof(atmdst)); 184 llc_hdr = (struct atmllc *)(dst->sa_data + 185 sizeof(atmdst)); 186 break; 187 188 default: 189#if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \ 190 defined(__NetBSD__) || defined(__OpenBSD__) 191 printf("%s: can't handle af%d\n", ifp->if_xname, 192 dst->sa_family); 193#elif defined(__FreeBSD__) || defined(__bsdi__) 194 printf("%s%d: can't handle af%d\n", ifp->if_name, 195 ifp->if_unit, dst->sa_family); 196#endif 197 senderr(EAFNOSUPPORT); 198 } 199 200 /* 201 * must add atm_pseudohdr to data 202 */ 203 sz = sizeof(atmdst); 204 atm_flags = ATM_PH_FLAGS(&atmdst); 205 if (atm_flags & ATM_PH_LLCSNAP) 206 sz += 8; /* sizeof snap == 8 */ 207 M_PREPEND(m, sz, M_DONTWAIT); 208 if (m == 0) 209 senderr(ENOBUFS); 210 ad = mtod(m, struct atm_pseudohdr *); 211 *ad = atmdst; 212 if (atm_flags & ATM_PH_LLCSNAP) { 213 atmllc = (struct atmllc *)(ad + 1); 214 if (llc_hdr == NULL) { 215 bcopy(ATMLLC_HDR, atmllc->llchdr, 216 sizeof(atmllc->llchdr)); 217 /* note: in host order */ 218 ATM_LLC_SETTYPE(atmllc, etype); 219 } 220 else 221 bcopy(llc_hdr, atmllc, sizeof(struct atmllc)); 222 } 223 } 224 225 if (ng_atm_output_p != NULL) { 226 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) { 227 if (m != NULL) 228 m_freem(m); 229 return (error); 230 } 231 if (m == NULL) 232 return (0); 233 } 234 235 /* 236 * Queue message on interface, and start output if interface 237 * not yet active. 238 */ 239 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, 240 -(int)sizeof(struct atm_pseudohdr))) 241 return (ENOBUFS); 242 return (error); 243 244bad: 245 if (m) 246 m_freem(m); 247 return (error); 248} 249 250/* 251 * Process a received ATM packet; 252 * the packet is in the mbuf chain m. 253 */ 254void 255atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m, 256 void *rxhand) 257{ 258 int isr; 259 u_int16_t etype = ETHERTYPE_IP; /* default */ 260 261 if ((ifp->if_flags & IFF_UP) == 0) { 262 m_freem(m); 263 return; 264 } 265#ifdef MAC 266 mac_create_mbuf_from_ifnet(ifp, m); 267#endif 268 ifp->if_ibytes += m->m_pkthdr.len; 269 270 if (ng_atm_input_p != NULL) { 271 (*ng_atm_input_p)(ifp, &m, ah, rxhand); 272 if (m == NULL) 273 return; 274 } 275 276 /* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */ 277 if (atm_harp_input_p != NULL) { 278 (*atm_harp_input_p)(ifp, &m, ah, rxhand); 279 if (m == NULL) 280 return; 281 } 282 283 if (rxhand) { 284#ifdef NATM 285 struct natmpcb *npcb; 286 287 /* 288 * XXXRW: this use of 'rxhand' is not a very good idea, and 289 * was subject to races even before SMPng due to the release 290 * of spl here. 291 */ 292 NATM_LOCK(); 293 npcb = rxhand; 294 npcb->npcb_inq++; /* count # in queue */ 295 isr = NETISR_NATM; 296 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 297 NATM_UNLOCK(); 298#else 299 printf("atm_input: NATM detected but not " 300 "configured in kernel\n"); 301 goto dropit; 302#endif 303 } else { 304 /* 305 * handle LLC/SNAP header, if present 306 */ 307 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 308 struct atmllc *alc; 309 310 if (m->m_len < sizeof(*alc) && 311 (m = m_pullup(m, sizeof(*alc))) == 0) 312 return; /* failed */ 313 alc = mtod(m, struct atmllc *); 314 if (bcmp(alc, ATMLLC_HDR, 6)) { 315#if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \ 316 defined(__NetBSD__) || defined(__OpenBSD__) 317 printf("%s: recv'd invalid LLC/SNAP frame " 318 "[vp=%d,vc=%d]\n", ifp->if_xname, 319 ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 320#elif defined(__FreeBSD__) || defined(__bsdi__) 321 printf("%s%d: recv'd invalid LLC/SNAP frame " 322 "[vp=%d,vc=%d]\n", ifp->if_name, 323 ifp->if_unit, ATM_PH_VPI(ah), 324 ATM_PH_VCI(ah)); 325#endif 326 m_freem(m); 327 return; 328 } 329 etype = ATM_LLC_TYPE(alc); 330 m_adj(m, sizeof(*alc)); 331 } 332 333 switch (etype) { 334 335#ifdef INET 336 case ETHERTYPE_IP: 337 isr = NETISR_IP; 338 break; 339#endif 340 341#ifdef INET6 342 case ETHERTYPE_IPV6: 343 isr = NETISR_IPV6; 344 break; 345#endif 346 default: 347#ifndef NATM 348 dropit: 349#endif 350 if (ng_atm_input_orphan_p != NULL) 351 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand); 352 else 353 m_freem(m); 354 return; 355 } 356 } 357 netisr_dispatch(isr, m); 358} 359 360/* 361 * Perform common duties while attaching to interface list. 362 */ 363void 364atm_ifattach(struct ifnet *ifp) 365{ 366 struct ifaddr *ifa; 367 struct sockaddr_dl *sdl; 368 struct ifatm *ifatm = ifp->if_l2com; 369 370 ifp->if_addrlen = 0; 371 ifp->if_hdrlen = 0; 372 if_attach(ifp); 373 ifp->if_mtu = ATMMTU; 374 ifp->if_output = atm_output; 375#if 0 376 ifp->if_input = atm_input; 377#endif 378 ifp->if_snd.ifq_maxlen = 50; /* dummy */ 379 380#if defined(__NetBSD__) || defined(__OpenBSD__) 381 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 382#elif defined(__FreeBSD__) && (__FreeBSD__ > 2) 383 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 384 ifa = TAILQ_NEXT(ifa, ifa_link)) 385#elif defined(__FreeBSD__) || defined(__bsdi__) 386 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 387#endif 388 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 389 sdl->sdl_family == AF_LINK) { 390 sdl->sdl_type = IFT_ATM; 391 sdl->sdl_alen = ifp->if_addrlen; 392#ifdef notyet /* if using ATMARP, store hardware address using the next line */ 393 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 394#endif 395 break; 396 } 397 398 ifp->if_linkmib = &ifatm->mib; 399 ifp->if_linkmiblen = sizeof(ifatm->mib); 400 401 if(ng_atm_attach_p) 402 (*ng_atm_attach_p)(ifp); 403 if (atm_harp_attach_p) 404 (*atm_harp_attach_p)(ifp); 405} 406 407/* 408 * Common stuff for detaching an ATM interface 409 */ 410void 411atm_ifdetach(struct ifnet *ifp) 412{ 413 if (atm_harp_detach_p) 414 (*atm_harp_detach_p)(ifp); 415 if(ng_atm_detach_p) 416 (*ng_atm_detach_p)(ifp); 417 if_detach(ifp); 418} 419 420/* 421 * Support routine for the SIOCATMGVCCS ioctl(). 422 * 423 * This routine assumes, that the private VCC structures used by the driver 424 * begin with a struct atmio_vcc. 425 * 426 * Return a table of VCCs in a freshly allocated memory area. 427 * Here we have a problem: we first count, how many vccs we need 428 * to return. The we allocate the memory and finally fill it in. 429 * Because we cannot lock while calling malloc, the number of active 430 * vccs may change while we're in malloc. So we allocate a couple of 431 * vccs more and if space anyway is not enough re-iterate. 432 * 433 * We could use an sx lock for the vcc tables. 434 */ 435struct atmio_vcctable * 436atm_getvccs(struct atmio_vcc **table, u_int size, u_int start, 437 struct mtx *lock, int waitok) 438{ 439 u_int cid, alloc; 440 size_t len; 441 struct atmio_vcctable *vccs; 442 struct atmio_vcc *v; 443 444 alloc = start + 10; 445 vccs = NULL; 446 447 for (;;) { 448 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]); 449 vccs = reallocf(vccs, len, M_TEMP, 450 waitok ? M_WAITOK : M_NOWAIT); 451 if (vccs == NULL) 452 return (NULL); 453 bzero(vccs, len); 454 455 vccs->count = 0; 456 v = vccs->vccs; 457 458 mtx_lock(lock); 459 for (cid = 0; cid < size; cid++) 460 if (table[cid] != NULL) { 461 if (++vccs->count == alloc) 462 /* too many - try again */ 463 break; 464 *v++ = *table[cid]; 465 } 466 mtx_unlock(lock); 467 468 if (cid == size) 469 break; 470 471 alloc *= 2; 472 } 473 return (vccs); 474} 475 476/* 477 * Driver or channel state has changed. Inform whoever is interested 478 * in these events. 479 */ 480void 481atm_event(struct ifnet *ifp, u_int event, void *arg) 482{ 483 if (ng_atm_event_p != NULL) 484 (*ng_atm_event_p)(ifp, event, arg); 485 if (atm_harp_event_p != NULL) 486 (*atm_harp_event_p)(ifp, event, arg); 487} 488 489static void * 490atm_alloc(u_char type, struct ifnet *ifp) 491{ 492 struct ifatm *ifatm; 493 494 ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO); 495 ifatm->ifp = ifp; 496 497 return (ifatm); 498} 499 500static void 501atm_free(void *com, u_char type) 502{ 503 504 free(com, M_IFATM); 505} 506 507static int 508atm_modevent(module_t mod, int type, void *data) 509{ 510 switch (type) { 511 case MOD_LOAD: 512 if_register_com_alloc(IFT_ATM, atm_alloc, atm_free); 513 break; 514 case MOD_UNLOAD: 515 if_deregister_com_alloc(IFT_ATM); 516 break; 517 default: 518 return (EOPNOTSUPP); 519 } 520 521 return (0); 522} 523 524static moduledata_t atm_mod = { 525 "atm", 526 atm_modevent, 527 0 528}; 529 530DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY); 531MODULE_VERSION(atm, 1); 532