Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_atmsubr.c
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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 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 == 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); 230 231 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 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))) == 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 */ 343 void 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 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 * 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 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 * 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 474 atm_free(void *com, u_char type) 475 { 476 477 free(com, M_IFATM); 478 } 479 480 static int 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);
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