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_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 = NULL; 153 /* 154 * check route 155 */ 156 if (rt0 != NULL) { 157 error = rt_check(&rt, &rt0, dst); 158 if (error) 159 goto bad; 160 RT_UNLOCK(rt); 161 } 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); 243 244 bad: 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 */ 254 void 255 atm_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 #ifdef NATM 261 int s; 262 #endif 263 264 if ((ifp->if_flags & IFF_UP) == 0) { 265 m_freem(m); 266 return; 267 } 268 #ifdef MAC 269 mac_create_mbuf_from_ifnet(ifp, m); 270 #endif 271 ifp->if_ibytes += m->m_pkthdr.len; 272 273 if (ng_atm_input_p != NULL) { 274 (*ng_atm_input_p)(ifp, &m, ah, rxhand); 275 if (m == NULL) 276 return; 277 } 278 279 /* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */ 280 if (atm_harp_input_p != NULL) { 281 (*atm_harp_input_p)(ifp, &m, ah, rxhand); 282 if (m == NULL) 283 return; 284 } 285 286 if (rxhand) { 287 #ifdef NATM 288 struct natmpcb *npcb = rxhand; 289 290 s = splimp(); /* in case 2 atm cards @ diff lvls */ 291 npcb->npcb_inq++; /* count # in queue */ 292 splx(s); 293 isr = NETISR_NATM; 294 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */ 295 #else 296 printf("atm_input: NATM detected but not " 297 "configured in kernel\n"); 298 goto dropit; 299 #endif 300 } else { 301 /* 302 * handle LLC/SNAP header, if present 303 */ 304 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) { 305 struct atmllc *alc; 306 307 if (m->m_len < sizeof(*alc) && 308 (m = m_pullup(m, sizeof(*alc))) == 0) 309 return; /* failed */ 310 alc = mtod(m, struct atmllc *); 311 if (bcmp(alc, ATMLLC_HDR, 6)) { 312 #if (defined(__FreeBSD__) && __FreeBSD_version >= 501113) || \ 313 defined(__NetBSD__) || defined(__OpenBSD__) 314 printf("%s: recv'd invalid LLC/SNAP frame " 315 "[vp=%d,vc=%d]\n", ifp->if_xname, 316 ATM_PH_VPI(ah), ATM_PH_VCI(ah)); 317 #elif defined(__FreeBSD__) || defined(__bsdi__) 318 printf("%s%d: recv'd invalid LLC/SNAP frame " 319 "[vp=%d,vc=%d]\n", ifp->if_name, 320 ifp->if_unit, ATM_PH_VPI(ah), 321 ATM_PH_VCI(ah)); 322 #endif 323 m_freem(m); 324 return; 325 } 326 etype = ATM_LLC_TYPE(alc); 327 m_adj(m, sizeof(*alc)); 328 } 329 330 switch (etype) { 331 332 #ifdef INET 333 case ETHERTYPE_IP: 334 isr = NETISR_IP; 335 break; 336 #endif 337 338 #ifdef INET6 339 case ETHERTYPE_IPV6: 340 isr = NETISR_IPV6; 341 break; 342 #endif 343 default: 344 #ifndef NATM 345 dropit: 346 #endif 347 if (ng_atm_input_orphan_p != NULL) 348 (*ng_atm_input_orphan_p)(ifp, m, ah, rxhand); 349 else 350 m_freem(m); 351 return; 352 } 353 } 354 netisr_dispatch(isr, m); 355 } 356 357 /* 358 * Perform common duties while attaching to interface list. 359 */ 360 void 361 atm_ifattach(struct ifnet *ifp) 362 { 363 struct ifaddr *ifa; 364 struct sockaddr_dl *sdl; 365 struct ifatm *ifatm = ifp->if_softc; 366 367 ifp->if_type = IFT_ATM; 368 ifp->if_addrlen = 0; 369 ifp->if_hdrlen = 0; 370 if_attach(ifp); 371 ifp->if_mtu = ATMMTU; 372 ifp->if_output = atm_output; 373 #if 0 374 ifp->if_input = atm_input; 375 #endif 376 ifp->if_snd.ifq_maxlen = 50; /* dummy */ 377 378 #if defined(__NetBSD__) || defined(__OpenBSD__) 379 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 380 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2) 381 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 382 ifa = TAILQ_NEXT(ifa, ifa_link)) 383 #elif defined(__FreeBSD__) || defined(__bsdi__) 384 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 385 #endif 386 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 387 sdl->sdl_family == AF_LINK) { 388 sdl->sdl_type = IFT_ATM; 389 sdl->sdl_alen = ifp->if_addrlen; 390 #ifdef notyet /* if using ATMARP, store hardware address using the next line */ 391 bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen); 392 #endif 393 break; 394 } 395 396 ifp->if_linkmib = &ifatm->mib; 397 ifp->if_linkmiblen = sizeof(ifatm->mib); 398 399 if(ng_atm_attach_p) 400 (*ng_atm_attach_p)(ifp); 401 if (atm_harp_attach_p) 402 (*atm_harp_attach_p)(ifp); 403 } 404 405 /* 406 * Common stuff for detaching an ATM interface 407 */ 408 void 409 atm_ifdetach(struct ifnet *ifp) 410 { 411 if (atm_harp_detach_p) 412 (*atm_harp_detach_p)(ifp); 413 if(ng_atm_detach_p) 414 (*ng_atm_detach_p)(ifp); 415 if_detach(ifp); 416 } 417 418 /* 419 * Support routine for the SIOCATMGVCCS ioctl(). 420 * 421 * This routine assumes, that the private VCC structures used by the driver 422 * begin with a struct atmio_vcc. 423 * 424 * Return a table of VCCs in a freshly allocated memory area. 425 * Here we have a problem: we first count, how many vccs we need 426 * to return. The we allocate the memory and finally fill it in. 427 * Because we cannot lock while calling malloc, the number of active 428 * vccs may change while we're in malloc. So we allocate a couple of 429 * vccs more and if space anyway is not enough re-iterate. 430 * 431 * We could use an sx lock for the vcc tables. 432 */ 433 struct atmio_vcctable * 434 atm_getvccs(struct atmio_vcc **table, u_int size, u_int start, 435 struct mtx *lock, int waitok) 436 { 437 u_int cid, alloc; 438 size_t len; 439 struct atmio_vcctable *vccs; 440 struct atmio_vcc *v; 441 442 alloc = start + 10; 443 vccs = NULL; 444 445 for (;;) { 446 len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]); 447 vccs = reallocf(vccs, len, M_TEMP, 448 waitok ? M_WAITOK : M_NOWAIT); 449 if (vccs == NULL) 450 return (NULL); 451 bzero(vccs, len); 452 453 vccs->count = 0; 454 v = vccs->vccs; 455 456 mtx_lock(lock); 457 for (cid = 0; cid < size; cid++) 458 if (table[cid] != NULL) { 459 if (++vccs->count == alloc) 460 /* too many - try again */ 461 break; 462 *v++ = *table[cid]; 463 } 464 mtx_unlock(lock); 465 466 if (cid == size) 467 break; 468 469 alloc *= 2; 470 } 471 return (vccs); 472 } 473 474 /* 475 * Driver or channel state has changed. Inform whoever is interested 476 * in these events. 477 */ 478 void 479 atm_event(struct ifnet *ifp, u_int event, void *arg) 480 { 481 if (ng_atm_event_p != NULL) 482 (*ng_atm_event_p)(ifp, event, arg); 483 if (atm_harp_event_p != NULL) 484 (*atm_harp_event_p)(ifp, event, arg); 485 } 486 487 static moduledata_t atm_mod = { 488 "atm", 489 NULL, 490 0 491 }; 492 493 DECLARE_MODULE(atm, atm_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 494 MODULE_VERSION(atm, 1);
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