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/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> 61 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> 67 #endif 68 #ifdef NATM 69 #include <netnatm/natm.h> 70 #endif 71 72 #include <security/mac/mac_framework.h> 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 */ 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 *); 89 90 /* 91 * Harp pseudo interface hooks 92 */ 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 *); 98 99 SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware"); 100 101 MALLOC_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 * "ro" = 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 * ro->ro_rt must also be NULL. 122 */ 123 int 124 atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 125 struct route *ro) 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_ifnet_check_transmit(ifp, m); 137 if (error) 138 senderr(error); 139 #endif 140 141 if (!((ifp->if_flags & IFF_UP) && 142 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 143 senderr(ENETDOWN); 144 145 /* 146 * check for non-native ATM traffic (dst != NULL) 147 */ 148 if (dst) { 149 switch (dst->sa_family) { 150 151 #if defined(INET) || defined(INET6) 152 case AF_INET: 153 case AF_INET6: 154 { 155 if (dst->sa_family == AF_INET6) 156 etype = ETHERTYPE_IPV6; 157 else 158 etype = ETHERTYPE_IP; 159 if (!atmresolve(ro->ro_rt, m, dst, &atmdst)) { 160 m = NULL; 161 /* XXX: atmresolve already free'd it */ 162 senderr(EHOSTUNREACH); 163 /* XXX: put ATMARP stuff here */ 164 /* XXX: watch who frees m on failure */ 165 } 166 } 167 break; 168 #endif /* INET || INET6 */ 169 170 case AF_UNSPEC: 171 /* 172 * XXX: bpfwrite. assuming dst contains 12 bytes 173 * (atm pseudo header (4) + LLC/SNAP (8)) 174 */ 175 bcopy(dst->sa_data, &atmdst, sizeof(atmdst)); 176 llc_hdr = (struct atmllc *)(dst->sa_data + 177 sizeof(atmdst)); 178 break; 179 180 default: 181 printf("%s: can't handle af%d\n", ifp->if_xname, 182 dst->sa_family); 183 senderr(EAFNOSUPPORT); 184 } 185 186 /* 187 * must add atm_pseudohdr to data 188 */ 189 sz = sizeof(atmdst); 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); 194 if (m == 0) 195 senderr(ENOBUFS); 196 ad = mtod(m, struct atm_pseudohdr *); 197 *ad = atmdst; 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); 205 } 206 else 207 bcopy(llc_hdr, atmllc, sizeof(struct atmllc)); 208 } 209 } 210 211 if (ng_atm_output_p != NULL) { 212 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) { 213 if (m != NULL) 214 m_freem(m); 215 return (error); 216 } 217 if (m == NULL) 218 return (0); 219 } 220 221 /* 222 * Queue message on interface, and start output if interface 223 * not yet active. 224 */ 225 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, 226 -(int)sizeof(struct atm_pseudohdr))) 227 return (ENOBUFS); 228 return (error); 229 230 bad: 231 if (m) 232 m_freem(m); 233 return (error); 234 } 235 236 /* 237 * Process a received ATM packet; 238 * the packet is in the mbuf chain m. 239 */ 240 void 241 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m, 242 void *rxhand) 243 { 244 int isr; 245 u_int16_t etype = ETHERTYPE_IP; /* default */ 246 247 if ((ifp->if_flags & IFF_UP) == 0) { 248 m_freem(m); 249 return; 250 } 251 #ifdef MAC 252 mac_ifnet_create_mbuf(ifp, m); 253 #endif 254 ifp->if_ibytes += m->m_pkthdr.len; 255 256 if (ng_atm_input_p != NULL) { 257 (*ng_atm_input_p)(ifp, &m, ah, rxhand); 258 if (m == NULL) 259 return; 260 } 261 262 /* 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); 265 if (m == NULL) 266 return; 267 } 268 269 if (rxhand) { 270 #ifdef NATM 271 struct natmpcb *npcb; 272 273 /* 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 276 * of spl here. 277 */ 278 NATM_LOCK(); 279 npcb = rxhand; 280 npcb->npcb_inq++; /* count # in queue */ 281 isr = NETISR_NATM; 282 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 283 NATM_UNLOCK(); 284 #else 285 printf("atm_input: NATM detected but not " 286 "configured in kernel\n"); 287 goto dropit; 288 #endif 289 } else { 290 /* 291 * handle LLC/SNAP header, if present 292 */ 293 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 294 struct atmllc *alc; 295 296 if (m->m_len < sizeof(*alc) && 297 (m = m_pullup(m, sizeof(*alc))) == 0) 298 return; /* failed */ 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)); 304 m_freem(m); 305 return; 306 } 307 etype = ATM_LLC_TYPE(alc); 308 m_adj(m, sizeof(*alc)); 309 } 310 311 switch (etype) { 312 313 #ifdef INET 314 case ETHERTYPE_IP: 315 isr = NETISR_IP; 316 break; 317 #endif 318 319 #ifdef INET6 320 case ETHERTYPE_IPV6: 321 isr = NETISR_IPV6; 322 break; 323 #endif 324 default: 325 #ifndef NATM 326 dropit: 327 #endif 328 if (ng_atm_input_orphan_p != NULL) 329 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand); 330 else 331 m_freem(m); 332 return; 333 } 334 } 335 M_SETFIB(m, ifp->if_fib); 336 netisr_dispatch(isr, m); 337 } 338 339 /* 340 * Perform common duties while attaching to interface list. 341 */ 342 void 343 atm_ifattach(struct ifnet *ifp) 344 { 345 struct ifaddr *ifa; 346 struct sockaddr_dl *sdl; 347 struct ifatm *ifatm = ifp->if_l2com; 348 349 ifp->if_addrlen = 0; 350 ifp->if_hdrlen = 0; 351 if_attach(ifp); 352 ifp->if_mtu = ATMMTU; 353 ifp->if_output = atm_output; 354 #if 0 355 ifp->if_input = atm_input; 356 #endif 357 ifp->if_snd.ifq_maxlen = 50; /* dummy */ 358 359 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 360 if (ifa->ifa_addr->sa_family == AF_LINK) { 361 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 362 sdl->sdl_type = IFT_ATM; 363 sdl->sdl_alen = ifp->if_addrlen; 364 #ifdef notyet /* if using ATMARP, store hardware address using the next line */ 365 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 366 #endif 367 break; 368 } 369 370 ifp->if_linkmib = &ifatm->mib; 371 ifp->if_linkmiblen = sizeof(ifatm->mib); 372 373 if(ng_atm_attach_p) 374 (*ng_atm_attach_p)(ifp); 375 if (atm_harp_attach_p) 376 (*atm_harp_attach_p)(ifp); 377 } 378 379 /* 380 * Common stuff for detaching an ATM interface 381 */ 382 void 383 atm_ifdetach(struct ifnet *ifp) 384 { 385 if (atm_harp_detach_p) 386 (*atm_harp_detach_p)(ifp); 387 if(ng_atm_detach_p) 388 (*ng_atm_detach_p)(ifp); 389 if_detach(ifp); 390 } 391 392 /* 393 * Support routine for the SIOCATMGVCCS ioctl(). 394 * 395 * This routine assumes, that the private VCC structures used by the driver 396 * begin with a struct atmio_vcc. 397 * 398 * Return a table of VCCs in a freshly allocated memory area. 399 * Here we have a problem: we first count, how many vccs we need 400 * to return. The we allocate the memory and finally fill it in. 401 * Because we cannot lock while calling malloc, the number of active 402 * vccs may change while we're in malloc. So we allocate a couple of 403 * vccs more and if space anyway is not enough re-iterate. 404 * 405 * We could use an sx lock for the vcc tables. 406 */ 407 struct atmio_vcctable * 408 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start, 409 struct mtx *lock, int waitok) 410 { 411 u_int cid, alloc; 412 size_t len; 413 struct atmio_vcctable *vccs; 414 struct atmio_vcc *v; 415 416 alloc = start + 10; 417 vccs = NULL; 418 419 for (;;) { 420 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]); 421 vccs = reallocf(vccs, len, M_TEMP, 422 waitok ? M_WAITOK : M_NOWAIT); 423 if (vccs == NULL) 424 return (NULL); 425 bzero(vccs, len); 426 427 vccs->count = 0; 428 v = vccs->vccs; 429 430 mtx_lock(lock); 431 for (cid = 0; cid < size; cid++) 432 if (table[cid] != NULL) { 433 if (++vccs->count == alloc) 434 /* too many - try again */ 435 break; 436 *v++ = *table[cid]; 437 } 438 mtx_unlock(lock); 439 440 if (cid == size) 441 break; 442 443 alloc *= 2; 444 } 445 return (vccs); 446 } 447 448 /* 449 * Driver or channel state has changed. Inform whoever is interested 450 * in these events. 451 */ 452 void 453 atm_event(struct ifnet *ifp, u_int event, void *arg) 454 { 455 if (ng_atm_event_p != NULL) 456 (*ng_atm_event_p)(ifp, event, arg); 457 if (atm_harp_event_p != NULL) 458 (*atm_harp_event_p)(ifp, event, arg); 459 } 460 461 static void * 462 atm_alloc(u_char type, struct ifnet *ifp) 463 { 464 struct ifatm *ifatm; 465 466 ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO); 467 ifatm->ifp = ifp; 468 469 return (ifatm); 470 } 471 472 static void 473 atm_free(void *com, u_char type) 474 { 475 476 free(com, M_IFATM); 477 } 478 479 static int 480 atm_modevent(module_t mod, int type, void *data) 481 { 482 switch (type) { 483 case MOD_LOAD: 484 if_register_com_alloc(IFT_ATM, atm_alloc, atm_free); 485 break; 486 case MOD_UNLOAD: 487 if_deregister_com_alloc(IFT_ATM); 488 break; 489 default: 490 return (EOPNOTSUPP); 491 } 492 493 return (0); 494 } 495 496 static moduledata_t atm_mod = { 497 "atm", 498 atm_modevent, 499 0 500 }; 501 502 DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY); 503 MODULE_VERSION(atm, 1);
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