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: releng/5.3/sys/net/if_atmsubr.c 136588 2004-10-16 08:43:07Z cvs2svn $"); 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 */ 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 #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 */ 121 int 122 atm_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 atmllc *atmllc; 130 struct atmllc *llc_hdr = NULL; 131 u_int32_t atm_flags; 132 133 #ifdef MAC 134 error = mac_check_ifnet_transmit(ifp, m); 135 if (error) 136 senderr(error); 137 #endif 138 139 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 140 senderr(ENETDOWN); 141 142 /* 143 * check for non-native ATM traffic (dst != NULL) 144 */ 145 if (dst) { 146 switch (dst->sa_family) { 147 148 #if defined(INET) || defined(INET6) 149 case AF_INET: 150 case AF_INET6: 151 { 152 struct rtentry *rt; 153 /* 154 * check route 155 */ 156 error = rt_check(&rt, &rt0, dst); 157 if (error) 158 goto bad; 159 160 if (dst->sa_family == AF_INET6) 161 etype = ETHERTYPE_IPV6; 162 else 163 etype = ETHERTYPE_IP; 164 if (!atmresolve(rt, m, dst, &atmdst)) { 165 m = NULL; 166 /* XXX: atmresolve already free'd it */ 167 senderr(EHOSTUNREACH); 168 /* XXX: put ATMARP stuff here */ 169 /* XXX: watch who frees m on failure */ 170 } 171 } 172 break; 173 #endif /* INET || INET6 */ 174 175 case AF_UNSPEC: 176 /* 177 * XXX: bpfwrite. assuming dst contains 12 bytes 178 * (atm pseudo header (4) + LLC/SNAP (8)) 179 */ 180 bcopy(dst->sa_data, &atmdst, sizeof(atmdst)); 181 llc_hdr = (struct atmllc *)(dst->sa_data + 182 sizeof(atmdst)); 183 break; 184 185 default: 186 #if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \ 187 defined(__NetBSD__) || defined(__OpenBSD__) 188 printf("%s: can't handle af%d\n", ifp->if_xname, 189 dst->sa_family); 190 #elif defined(__FreeBSD__) || defined(__bsdi__) 191 printf("%s%d: can't handle af%d\n", ifp->if_name, 192 ifp->if_unit, dst->sa_family); 193 #endif 194 senderr(EAFNOSUPPORT); 195 } 196 197 /* 198 * must add atm_pseudohdr to data 199 */ 200 sz = sizeof(atmdst); 201 atm_flags = ATM_PH_FLAGS(&atmdst); 202 if (atm_flags & ATM_PH_LLCSNAP) 203 sz += 8; /* sizeof snap == 8 */ 204 M_PREPEND(m, sz, M_DONTWAIT); 205 if (m == 0) 206 senderr(ENOBUFS); 207 ad = mtod(m, struct atm_pseudohdr *); 208 *ad = atmdst; 209 if (atm_flags & ATM_PH_LLCSNAP) { 210 atmllc = (struct atmllc *)(ad + 1); 211 if (llc_hdr == NULL) { 212 bcopy(ATMLLC_HDR, atmllc->llchdr, 213 sizeof(atmllc->llchdr)); 214 /* note: in host order */ 215 ATM_LLC_SETTYPE(atmllc, etype); 216 } 217 else 218 bcopy(llc_hdr, atmllc, sizeof(struct atmllc)); 219 } 220 } 221 222 if (ng_atm_output_p != NULL) { 223 if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) { 224 if (m != NULL) 225 m_freem(m); 226 return (error); 227 } 228 if (m == NULL) 229 return (0); 230 } 231 232 /* 233 * Queue message on interface, and start output if interface 234 * not yet active. 235 */ 236 if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, 237 -(int)sizeof(struct atm_pseudohdr))) 238 return (ENOBUFS); 239 return (error); 240 241 bad: 242 if (m) 243 m_freem(m); 244 return (error); 245 } 246 247 /* 248 * Process a received ATM packet; 249 * the packet is in the mbuf chain m. 250 */ 251 void 252 atm_input(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m, 253 void *rxhand) 254 { 255 int isr; 256 u_int16_t etype = ETHERTYPE_IP; /* default */ 257 #ifdef NATM 258 int s; 259 #endif 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 = rxhand; 286 287 s = splimp(); /* in case 2 atm cards @ diff lvls */ 288 npcb->npcb_inq++; /* count # in queue */ 289 splx(s); 290 isr = NETISR_NATM; 291 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 292 #else 293 printf("atm_input: NATM detected but not " 294 "configured in kernel\n"); 295 goto dropit; 296 #endif 297 } else { 298 /* 299 * handle LLC/SNAP header, if present 300 */ 301 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 302 struct atmllc *alc; 303 304 if (m->m_len < sizeof(*alc) && 305 (m = m_pullup(m, sizeof(*alc))) == 0) 306 return; /* failed */ 307 alc = mtod(m, struct atmllc *); 308 if (bcmp(alc, ATMLLC_HDR, 6)) { 309 #if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \ 310 defined(__NetBSD__) || defined(__OpenBSD__) 311 printf("%s: recv'd invalid LLC/SNAP frame " 312 "[vp=%d,vc=%d]\n", ifp->if_xname, 313 ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 314 #elif defined(__FreeBSD__) || defined(__bsdi__) 315 printf("%s%d: recv'd invalid LLC/SNAP frame " 316 "[vp=%d,vc=%d]\n", ifp->if_name, 317 ifp->if_unit, ATM_PH_VPI(ah), 318 ATM_PH_VCI(ah)); 319 #endif 320 m_freem(m); 321 return; 322 } 323 etype = ATM_LLC_TYPE(alc); 324 m_adj(m, sizeof(*alc)); 325 } 326 327 switch (etype) { 328 329 #ifdef INET 330 case ETHERTYPE_IP: 331 isr = NETISR_IP; 332 break; 333 #endif 334 335 #ifdef INET6 336 case ETHERTYPE_IPV6: 337 isr = NETISR_IPV6; 338 break; 339 #endif 340 default: 341 #ifndef NATM 342 dropit: 343 #endif 344 if (ng_atm_input_orphan_p != NULL) 345 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand); 346 else 347 m_freem(m); 348 return; 349 } 350 } 351 netisr_dispatch(isr, m); 352 } 353 354 /* 355 * Perform common duties while attaching to interface list. 356 */ 357 void 358 atm_ifattach(struct ifnet *ifp) 359 { 360 struct ifaddr *ifa; 361 struct sockaddr_dl *sdl; 362 struct ifatm *ifatm = ifp->if_softc; 363 364 ifp->if_type = IFT_ATM; 365 ifp->if_addrlen = 0; 366 ifp->if_hdrlen = 0; 367 if_attach(ifp); 368 ifp->if_mtu = ATMMTU; 369 ifp->if_output = atm_output; 370 #if 0 371 ifp->if_input = atm_input; 372 #endif 373 ifp->if_snd.ifq_maxlen = 50; /* dummy */ 374 375 #if defined(__NetBSD__) || defined(__OpenBSD__) 376 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 377 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2) 378 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 379 ifa = TAILQ_NEXT(ifa, ifa_link)) 380 #elif defined(__FreeBSD__) || defined(__bsdi__) 381 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 382 #endif 383 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 384 sdl->sdl_family == AF_LINK) { 385 sdl->sdl_type = IFT_ATM; 386 sdl->sdl_alen = ifp->if_addrlen; 387 #ifdef notyet /* if using ATMARP, store hardware address using the next line */ 388 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 389 #endif 390 break; 391 } 392 393 ifp->if_linkmib = &ifatm->mib; 394 ifp->if_linkmiblen = sizeof(ifatm->mib); 395 396 if(ng_atm_attach_p) 397 (*ng_atm_attach_p)(ifp); 398 if (atm_harp_attach_p) 399 (*atm_harp_attach_p)(ifp); 400 } 401 402 /* 403 * Common stuff for detaching an ATM interface 404 */ 405 void 406 atm_ifdetach(struct ifnet *ifp) 407 { 408 if (atm_harp_detach_p) 409 (*atm_harp_detach_p)(ifp); 410 if(ng_atm_detach_p) 411 (*ng_atm_detach_p)(ifp); 412 if_detach(ifp); 413 } 414 415 /* 416 * Support routine for the SIOCATMGVCCS ioctl(). 417 * 418 * This routine assumes, that the private VCC structures used by the driver 419 * begin with a struct atmio_vcc. 420 * 421 * Return a table of VCCs in a freshly allocated memory area. 422 * Here we have a problem: we first count, how many vccs we need 423 * to return. The we allocate the memory and finally fill it in. 424 * Because we cannot lock while calling malloc, the number of active 425 * vccs may change while we're in malloc. So we allocate a couple of 426 * vccs more and if space anyway is not enough re-iterate. 427 * 428 * We could use an sx lock for the vcc tables. 429 */ 430 struct atmio_vcctable * 431 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start, 432 struct mtx *lock, int waitok) 433 { 434 u_int cid, alloc; 435 size_t len; 436 struct atmio_vcctable *vccs; 437 struct atmio_vcc *v; 438 439 alloc = start + 10; 440 vccs = NULL; 441 442 for (;;) { 443 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]); 444 vccs = reallocf(vccs, len, M_TEMP, 445 waitok ? M_WAITOK : M_NOWAIT); 446 if (vccs == NULL) 447 return (NULL); 448 bzero(vccs, len); 449 450 vccs->count = 0; 451 v = vccs->vccs; 452 453 mtx_lock(lock); 454 for (cid = 0; cid < size; cid++) 455 if (table[cid] != NULL) { 456 if (++vccs->count == alloc) 457 /* too many - try again */ 458 break; 459 *v++ = *table[cid]; 460 } 461 mtx_unlock(lock); 462 463 if (cid == size) 464 break; 465 466 alloc *= 2; 467 } 468 return (vccs); 469 } 470 471 /* 472 * Driver or channel state has changed. Inform whoever is interested 473 * in these events. 474 */ 475 void 476 atm_event(struct ifnet *ifp, u_int event, void *arg) 477 { 478 if (ng_atm_event_p != NULL) 479 (*ng_atm_event_p)(ifp, event, arg); 480 if (atm_harp_event_p != NULL) 481 (*atm_harp_event_p)(ifp, event, arg); 482 } 483 484 static moduledata_t atm_mod = { 485 "atm", 486 NULL, 487 0 488 }; 489 490 DECLARE_MODULE(atm, atm_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 491 MODULE_VERSION(atm, 1);
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