Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netnatm/natm.c
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1 /*- 2 * Copyright (c) 2005-2006 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * Copyright (c) 1996 Charles D. Cranor and Washington University. 27 * All rights reserved. 28 * 29 * Redistribution and use in source and binary forms, with or without 30 * modification, are permitted provided that the following conditions 31 * are met: 32 * 1. Redistributions of source code must retain the above copyright 33 * notice, this list of conditions and the following disclaimer. 34 * 2. Redistributions in binary form must reproduce the above copyright 35 * notice, this list of conditions and the following disclaimer in the 36 * documentation and/or other materials provided with the distribution. 37 * 3. All advertising materials mentioning features or use of this software 38 * must display the following acknowledgement: 39 * This product includes software developed by Charles D. Cranor and 40 * Washington University. 41 * 4. The name of the author may not be used to endorse or promote products 42 * derived from this software without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 48 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 49 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 53 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * 55 * $NetBSD: natm.c,v 1.5 1996/11/09 03:26:26 chuck Exp $ 56 */ 57 58 /* 59 * natm.c: Native mode ATM access (both aal0 and aal5). 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD$"); 64 65 #include <sys/param.h> 66 #include <sys/conf.h> 67 #include <sys/kernel.h> 68 #include <sys/lock.h> 69 #include <sys/malloc.h> 70 #include <sys/mbuf.h> 71 #include <sys/protosw.h> 72 #include <sys/signalvar.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/sockio.h> 76 #include <sys/sx.h> 77 #include <sys/systm.h> 78 #include <sys/sysctl.h> 79 80 #include <net/if.h> 81 #include <net/if_atm.h> 82 #include <net/netisr.h> 83 84 #include <netinet/in.h> 85 86 #include <netnatm/natm.h> 87 88 static const u_long natm5_sendspace = 16*1024; 89 static const u_long natm5_recvspace = 16*1024; 90 91 static const u_long natm0_sendspace = 16*1024; 92 static const u_long natm0_recvspace = 16*1024; 93 94 /* 95 * netnatm global subsystem lock, protects all global data structures in 96 * netnatm. 97 */ 98 struct mtx natm_mtx; 99 100 /* 101 * User socket requests. 102 */ 103 static int natm_usr_attach(struct socket *, int, d_thread_t *); 104 static void natm_usr_detach(struct socket *); 105 static int natm_usr_connect(struct socket *, struct sockaddr *, 106 d_thread_t *); 107 static int natm_usr_disconnect(struct socket *); 108 static int natm_usr_shutdown(struct socket *); 109 static int natm_usr_send(struct socket *, int, struct mbuf *, 110 struct sockaddr *, struct mbuf *, d_thread_t *); 111 static int natm_usr_peeraddr(struct socket *, struct sockaddr **); 112 static int natm_usr_control(struct socket *, u_long, caddr_t, 113 struct ifnet *, d_thread_t *); 114 static void natm_usr_abort(struct socket *); 115 static int natm_usr_bind(struct socket *, struct sockaddr *, 116 d_thread_t *); 117 static int natm_usr_sockaddr(struct socket *, struct sockaddr **); 118 119 static int 120 natm_usr_attach(struct socket *so, int proto, d_thread_t *p) 121 { 122 struct natmpcb *npcb; 123 int error = 0; 124 125 npcb = (struct natmpcb *)so->so_pcb; 126 KASSERT(npcb == NULL, ("natm_usr_attach: so_pcb != NULL")); 127 128 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 129 if (proto == PROTO_NATMAAL5) 130 error = soreserve(so, natm5_sendspace, 131 natm5_recvspace); 132 else 133 error = soreserve(so, natm0_sendspace, 134 natm0_recvspace); 135 if (error) 136 return (error); 137 } 138 so->so_pcb = npcb = npcb_alloc(M_WAITOK); 139 npcb->npcb_socket = so; 140 return (error); 141 } 142 143 static void 144 natm_usr_detach(struct socket *so) 145 { 146 struct natmpcb *npcb; 147 148 npcb = (struct natmpcb *)so->so_pcb; 149 KASSERT(npcb != NULL, ("natm_usr_detach: npcb == NULL")); 150 151 NATM_LOCK(); 152 npcb_free(npcb, NPCB_DESTROY); /* drain */ 153 so->so_pcb = NULL; 154 NATM_UNLOCK(); 155 } 156 157 static int 158 natm_usr_connect(struct socket *so, struct sockaddr *nam, d_thread_t *p) 159 { 160 struct natmpcb *npcb; 161 struct sockaddr_natm *snatm; 162 struct atmio_openvcc op; 163 struct ifnet *ifp; 164 int error = 0; 165 int proto = so->so_proto->pr_protocol; 166 167 npcb = (struct natmpcb *)so->so_pcb; 168 KASSERT(npcb != NULL, ("natm_usr_connect: npcb == NULL")); 169 170 /* 171 * Validate nam and npcb. 172 */ 173 NATM_LOCK(); 174 snatm = (struct sockaddr_natm *)nam; 175 if (snatm->snatm_len != sizeof(*snatm) || 176 (npcb->npcb_flags & NPCB_FREE) == 0) { 177 NATM_UNLOCK(); 178 return (EINVAL); 179 } 180 if (snatm->snatm_family != AF_NATM) { 181 NATM_UNLOCK(); 182 return (EAFNOSUPPORT); 183 } 184 185 snatm->snatm_if[IFNAMSIZ - 1] = '\0'; /* XXX ensure null termination 186 since ifunit() uses strcmp */ 187 188 /* 189 * Convert interface string to ifp, validate. 190 */ 191 ifp = ifunit(snatm->snatm_if); 192 if (ifp == NULL || (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 193 NATM_UNLOCK(); 194 return (ENXIO); 195 } 196 if (ifp->if_output != atm_output) { 197 NATM_UNLOCK(); 198 return (EAFNOSUPPORT); 199 } 200 201 /* 202 * Register us with the NATM PCB layer. 203 */ 204 if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) { 205 NATM_UNLOCK(); 206 return (EADDRINUSE); 207 } 208 209 /* 210 * Open the channel. 211 * 212 * XXXRW: Eventually desirable to hold mutex over ioctl? 213 */ 214 bzero(&op, sizeof(op)); 215 op.rxhand = npcb; 216 op.param.flags = ATMIO_FLAG_PVC; 217 op.param.vpi = npcb->npcb_vpi; 218 op.param.vci = npcb->npcb_vci; 219 op.param.rmtu = op.param.tmtu = ifp->if_mtu; 220 op.param.aal = (proto == PROTO_NATMAAL5) ? ATMIO_AAL_5 : ATMIO_AAL_0; 221 op.param.traffic = ATMIO_TRAFFIC_UBR; 222 NATM_UNLOCK(); 223 224 IFF_LOCKGIANT(ifp); 225 if (ifp->if_ioctl == NULL || 226 ifp->if_ioctl(ifp, SIOCATMOPENVCC, (caddr_t)&op) != 0) { 227 IFF_UNLOCKGIANT(ifp); 228 return (EIO); 229 } 230 IFF_UNLOCKGIANT(ifp); 231 soisconnected(so); 232 return (error); 233 } 234 235 static int 236 natm_usr_disconnect(struct socket *so) 237 { 238 struct natmpcb *npcb; 239 struct atmio_closevcc cl; 240 struct ifnet *ifp; 241 int error = 0; 242 243 npcb = (struct natmpcb *)so->so_pcb; 244 KASSERT(npcb != NULL, ("natm_usr_disconnect: npcb == NULL")); 245 246 NATM_LOCK(); 247 if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) { 248 NATM_UNLOCK(); 249 printf("natm: disconnected check\n"); 250 return (EIO); 251 } 252 ifp = npcb->npcb_ifp; 253 254 /* 255 * Disable rx. 256 * 257 * XXXRW: Eventually desirable to hold mutex over ioctl? 258 */ 259 cl.vpi = npcb->npcb_vpi; 260 cl.vci = npcb->npcb_vci; 261 NATM_UNLOCK(); 262 if (ifp->if_ioctl != NULL) { 263 IFF_LOCKGIANT(ifp); 264 ifp->if_ioctl(ifp, SIOCATMCLOSEVCC, (caddr_t)&cl); 265 IFF_UNLOCKGIANT(ifp); 266 } 267 soisdisconnected(so); 268 return (error); 269 } 270 271 static int 272 natm_usr_shutdown(struct socket *so) 273 { 274 275 socantsendmore(so); 276 return (0); 277 } 278 279 static int 280 natm_usr_send(struct socket *so, int flags, struct mbuf *m, 281 struct sockaddr *nam, struct mbuf *control, d_thread_t *p) 282 { 283 struct natmpcb *npcb; 284 struct atm_pseudohdr *aph; 285 int error = 0; 286 int proto = so->so_proto->pr_protocol; 287 288 npcb = (struct natmpcb *)so->so_pcb; 289 KASSERT(npcb != NULL, ("natm_usr_send: npcb == NULL")); 290 291 NATM_LOCK(); 292 if (control && control->m_len) { 293 NATM_UNLOCK(); 294 m_freem(control); 295 m_freem(m); 296 return (EINVAL); 297 } 298 299 /* 300 * Send the data. We must put an atm_pseudohdr on first. 301 */ 302 M_PREPEND(m, sizeof(*aph), M_DONTWAIT); 303 if (m == NULL) { 304 NATM_UNLOCK(); 305 m_freem(control); 306 return (ENOBUFS); 307 } 308 aph = mtod(m, struct atm_pseudohdr *); 309 ATM_PH_VPI(aph) = npcb->npcb_vpi; 310 ATM_PH_SETVCI(aph, npcb->npcb_vci); 311 ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0; 312 error = atm_output(npcb->npcb_ifp, m, NULL, NULL); 313 NATM_UNLOCK(); 314 return (error); 315 } 316 317 static int 318 natm_usr_peeraddr(struct socket *so, struct sockaddr **nam) 319 { 320 struct natmpcb *npcb; 321 struct sockaddr_natm *snatm, ssnatm; 322 323 npcb = (struct natmpcb *)so->so_pcb; 324 KASSERT(npcb != NULL, ("natm_usr_peeraddr: npcb == NULL")); 325 326 NATM_LOCK(); 327 snatm = &ssnatm; 328 bzero(snatm, sizeof(*snatm)); 329 snatm->snatm_len = sizeof(*snatm); 330 snatm->snatm_family = AF_NATM; 331 strlcpy(snatm->snatm_if, npcb->npcb_ifp->if_xname, 332 sizeof(snatm->snatm_if)); 333 snatm->snatm_vci = npcb->npcb_vci; 334 snatm->snatm_vpi = npcb->npcb_vpi; 335 NATM_UNLOCK(); 336 *nam = sodupsockaddr((struct sockaddr *)snatm, M_WAITOK); 337 return (0); 338 } 339 340 static int 341 natm_usr_control(struct socket *so, u_long cmd, caddr_t arg, 342 struct ifnet *ifp, d_thread_t *p) 343 { 344 struct natmpcb *npcb; 345 int error; 346 347 npcb = (struct natmpcb *)so->so_pcb; 348 KASSERT(npcb != NULL, ("natm_usr_control: npcb == NULL")); 349 350 if (ifp == NULL || ifp->if_ioctl == NULL) 351 return (EOPNOTSUPP); 352 IFF_LOCKGIANT(ifp); 353 error = ((*ifp->if_ioctl)(ifp, cmd, arg)); 354 IFF_UNLOCKGIANT(ifp); 355 return (error); 356 } 357 358 static void 359 natm_usr_abort(struct socket *so) 360 { 361 362 } 363 364 static void 365 natm_usr_close(struct socket *so) 366 { 367 368 } 369 370 static int 371 natm_usr_bind(struct socket *so, struct sockaddr *nam, d_thread_t *p) 372 { 373 374 return (EOPNOTSUPP); 375 } 376 377 static int 378 natm_usr_sockaddr(struct socket *so, struct sockaddr **nam) 379 { 380 381 return (EOPNOTSUPP); 382 } 383 384 /* xxx - should be const */ 385 struct pr_usrreqs natm_usrreqs = { 386 .pru_abort = natm_usr_abort, 387 .pru_attach = natm_usr_attach, 388 .pru_bind = natm_usr_bind, 389 .pru_connect = natm_usr_connect, 390 .pru_control = natm_usr_control, 391 .pru_detach = natm_usr_detach, 392 .pru_disconnect = natm_usr_disconnect, 393 .pru_peeraddr = natm_usr_peeraddr, 394 .pru_send = natm_usr_send, 395 .pru_shutdown = natm_usr_shutdown, 396 .pru_sockaddr = natm_usr_sockaddr, 397 .pru_close = natm_usr_close, 398 }; 399 400 /* 401 * natmintr: interrupt 402 * 403 * Note: we expect a socket pointer in rcvif rather than an interface 404 * pointer. We can get the interface pointer from the so's PCB if we really 405 * need it. 406 */ 407 void 408 natmintr(struct mbuf *m) 409 { 410 struct socket *so; 411 struct natmpcb *npcb; 412 413 #ifdef DIAGNOSTIC 414 M_ASSERTPKTHDR(m); 415 #endif 416 417 NATM_LOCK(); 418 npcb = (struct natmpcb *)m->m_pkthdr.rcvif; /* XXX: overloaded */ 419 so = npcb->npcb_socket; 420 421 npcb->npcb_inq--; 422 423 if (npcb->npcb_flags & NPCB_DRAIN) { 424 if (npcb->npcb_inq == 0) 425 FREE(npcb, M_PCB); /* done! */ 426 NATM_UNLOCK(); 427 m_freem(m); 428 return; 429 } 430 431 if (npcb->npcb_flags & NPCB_FREE) { 432 NATM_UNLOCK(); 433 m_freem(m); /* drop */ 434 return; 435 } 436 437 #ifdef NEED_TO_RESTORE_IFP 438 m->m_pkthdr.rcvif = npcb->npcb_ifp; 439 #else 440 #ifdef DIAGNOSTIC 441 m->m_pkthdr.rcvif = NULL; /* null it out to be safe */ 442 #endif 443 #endif 444 445 if (sbspace(&so->so_rcv) > m->m_pkthdr.len) { 446 #ifdef NATM_STAT 447 natm_sookcnt++; 448 natm_sookbytes += m->m_pkthdr.len; 449 #endif 450 sbappendrecord(&so->so_rcv, m); 451 sorwakeup(so); 452 NATM_UNLOCK(); 453 } else { 454 #ifdef NATM_STAT 455 natm_sodropcnt++; 456 natm_sodropbytes += m->m_pkthdr.len; 457 #endif 458 NATM_UNLOCK(); 459 m_freem(m); 460 } 461 } 462 463 /* 464 * natm0_sysctl: not used, but here in case we want to add something 465 * later... 466 */ 467 int 468 natm0_sysctl(SYSCTL_HANDLER_ARGS) 469 { 470 471 /* All sysctl names at this level are terminal. */ 472 return (ENOENT); 473 } 474 475 /* 476 * natm5_sysctl: not used, but here in case we want to add something 477 * later... 478 */ 479 int 480 natm5_sysctl(SYSCTL_HANDLER_ARGS) 481 { 482 483 /* All sysctl names at this level are terminal. */ 484 return (ENOENT); 485 }
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