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: releng/11.2/sys/netnatm/natm.c 257176 2013-10-26 17:58:36Z glebius $"); 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_var.h> 82 #include <net/if_atm.h> 83 #include <net/netisr.h> 84 85 #include <netinet/in.h> 86 87 #include <netnatm/natm.h> 88 89 static const u_long natm5_sendspace = 16*1024; 90 static const u_long natm5_recvspace = 16*1024; 91 92 static const u_long natm0_sendspace = 16*1024; 93 static const u_long natm0_recvspace = 16*1024; 94 95 /* 96 * netnatm global subsystem lock, protects all global data structures in 97 * netnatm. 98 */ 99 struct mtx natm_mtx; 100 101 /* 102 * User socket requests. 103 */ 104 static int natm_usr_attach(struct socket *, int, struct thread *); 105 static void natm_usr_detach(struct socket *); 106 static int natm_usr_connect(struct socket *, struct sockaddr *, 107 struct thread *); 108 static int natm_usr_disconnect(struct socket *); 109 static int natm_usr_shutdown(struct socket *); 110 static int natm_usr_send(struct socket *, int, struct mbuf *, 111 struct sockaddr *, struct mbuf *, struct thread *); 112 static int natm_usr_peeraddr(struct socket *, struct sockaddr **); 113 static int natm_usr_control(struct socket *, u_long, caddr_t, 114 struct ifnet *, struct thread *); 115 static void natm_usr_abort(struct socket *); 116 static int natm_usr_bind(struct socket *, struct sockaddr *, 117 struct thread *); 118 static int natm_usr_sockaddr(struct socket *, struct sockaddr **); 119 120 static int 121 natm_usr_attach(struct socket *so, int proto, struct thread *p) 122 { 123 struct natmpcb *npcb; 124 int error = 0; 125 126 npcb = (struct natmpcb *)so->so_pcb; 127 KASSERT(npcb == NULL, ("natm_usr_attach: so_pcb != NULL")); 128 129 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 130 if (proto == PROTO_NATMAAL5) 131 error = soreserve(so, natm5_sendspace, 132 natm5_recvspace); 133 else 134 error = soreserve(so, natm0_sendspace, 135 natm0_recvspace); 136 if (error) 137 return (error); 138 } 139 so->so_pcb = npcb = npcb_alloc(M_WAITOK); 140 npcb->npcb_socket = so; 141 return (error); 142 } 143 144 static void 145 natm_usr_detach(struct socket *so) 146 { 147 struct natmpcb *npcb; 148 149 npcb = (struct natmpcb *)so->so_pcb; 150 KASSERT(npcb != NULL, ("natm_usr_detach: npcb == NULL")); 151 152 NATM_LOCK(); 153 npcb_free(npcb, NPCB_DESTROY); /* drain */ 154 so->so_pcb = NULL; 155 NATM_UNLOCK(); 156 } 157 158 static int 159 natm_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *p) 160 { 161 struct natmpcb *npcb; 162 struct sockaddr_natm *snatm; 163 struct atmio_openvcc op; 164 struct ifnet *ifp; 165 int error = 0; 166 int proto = so->so_proto->pr_protocol; 167 168 npcb = (struct natmpcb *)so->so_pcb; 169 KASSERT(npcb != NULL, ("natm_usr_connect: npcb == NULL")); 170 171 /* 172 * Validate nam and npcb. 173 */ 174 NATM_LOCK(); 175 snatm = (struct sockaddr_natm *)nam; 176 if (snatm->snatm_len != sizeof(*snatm) || 177 (npcb->npcb_flags & NPCB_FREE) == 0) { 178 NATM_UNLOCK(); 179 return (EINVAL); 180 } 181 if (snatm->snatm_family != AF_NATM) { 182 NATM_UNLOCK(); 183 return (EAFNOSUPPORT); 184 } 185 186 snatm->snatm_if[IFNAMSIZ - 1] = '\0'; /* XXX ensure null termination 187 since ifunit() uses strcmp */ 188 189 /* 190 * Convert interface string to ifp, validate. 191 */ 192 ifp = ifunit(snatm->snatm_if); 193 if (ifp == NULL || (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 194 NATM_UNLOCK(); 195 return (ENXIO); 196 } 197 if (ifp->if_output != atm_output) { 198 NATM_UNLOCK(); 199 return (EAFNOSUPPORT); 200 } 201 202 /* 203 * Register us with the NATM PCB layer. 204 */ 205 if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) { 206 NATM_UNLOCK(); 207 return (EADDRINUSE); 208 } 209 210 /* 211 * Open the channel. 212 * 213 * XXXRW: Eventually desirable to hold mutex over ioctl? 214 */ 215 bzero(&op, sizeof(op)); 216 op.rxhand = npcb; 217 op.param.flags = ATMIO_FLAG_PVC; 218 op.param.vpi = npcb->npcb_vpi; 219 op.param.vci = npcb->npcb_vci; 220 op.param.rmtu = op.param.tmtu = ifp->if_mtu; 221 op.param.aal = (proto == PROTO_NATMAAL5) ? ATMIO_AAL_5 : ATMIO_AAL_0; 222 op.param.traffic = ATMIO_TRAFFIC_UBR; 223 NATM_UNLOCK(); 224 225 if (ifp->if_ioctl == NULL || 226 ifp->if_ioctl(ifp, SIOCATMOPENVCC, (caddr_t)&op) != 0) 227 return (EIO); 228 soisconnected(so); 229 return (error); 230 } 231 232 static int 233 natm_usr_disconnect(struct socket *so) 234 { 235 struct natmpcb *npcb; 236 struct atmio_closevcc cl; 237 struct ifnet *ifp; 238 int error = 0; 239 240 npcb = (struct natmpcb *)so->so_pcb; 241 KASSERT(npcb != NULL, ("natm_usr_disconnect: npcb == NULL")); 242 243 NATM_LOCK(); 244 if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) { 245 NATM_UNLOCK(); 246 printf("natm: disconnected check\n"); 247 return (EIO); 248 } 249 ifp = npcb->npcb_ifp; 250 251 /* 252 * Disable rx. 253 * 254 * XXXRW: Eventually desirable to hold mutex over ioctl? 255 */ 256 cl.vpi = npcb->npcb_vpi; 257 cl.vci = npcb->npcb_vci; 258 NATM_UNLOCK(); 259 if (ifp->if_ioctl != NULL) 260 ifp->if_ioctl(ifp, SIOCATMCLOSEVCC, (caddr_t)&cl); 261 soisdisconnected(so); 262 return (error); 263 } 264 265 static int 266 natm_usr_shutdown(struct socket *so) 267 { 268 269 socantsendmore(so); 270 return (0); 271 } 272 273 static int 274 natm_usr_send(struct socket *so, int flags, struct mbuf *m, 275 struct sockaddr *nam, struct mbuf *control, struct thread *p) 276 { 277 struct natmpcb *npcb; 278 struct atm_pseudohdr *aph; 279 int error = 0; 280 int proto = so->so_proto->pr_protocol; 281 282 npcb = (struct natmpcb *)so->so_pcb; 283 KASSERT(npcb != NULL, ("natm_usr_send: npcb == NULL")); 284 285 NATM_LOCK(); 286 if (control && control->m_len) { 287 NATM_UNLOCK(); 288 m_freem(control); 289 m_freem(m); 290 return (EINVAL); 291 } 292 293 /* 294 * Send the data. We must put an atm_pseudohdr on first. 295 */ 296 M_PREPEND(m, sizeof(*aph), M_NOWAIT); 297 if (m == NULL) { 298 NATM_UNLOCK(); 299 m_freem(control); 300 return (ENOBUFS); 301 } 302 aph = mtod(m, struct atm_pseudohdr *); 303 ATM_PH_VPI(aph) = npcb->npcb_vpi; 304 ATM_PH_SETVCI(aph, npcb->npcb_vci); 305 ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0; 306 error = atm_output(npcb->npcb_ifp, m, NULL, NULL); 307 NATM_UNLOCK(); 308 return (error); 309 } 310 311 static int 312 natm_usr_peeraddr(struct socket *so, struct sockaddr **nam) 313 { 314 struct natmpcb *npcb; 315 struct sockaddr_natm *snatm, ssnatm; 316 317 npcb = (struct natmpcb *)so->so_pcb; 318 KASSERT(npcb != NULL, ("natm_usr_peeraddr: npcb == NULL")); 319 320 NATM_LOCK(); 321 snatm = &ssnatm; 322 bzero(snatm, sizeof(*snatm)); 323 snatm->snatm_len = sizeof(*snatm); 324 snatm->snatm_family = AF_NATM; 325 strlcpy(snatm->snatm_if, npcb->npcb_ifp->if_xname, 326 sizeof(snatm->snatm_if)); 327 snatm->snatm_vci = npcb->npcb_vci; 328 snatm->snatm_vpi = npcb->npcb_vpi; 329 NATM_UNLOCK(); 330 *nam = sodupsockaddr((struct sockaddr *)snatm, M_WAITOK); 331 return (0); 332 } 333 334 static int 335 natm_usr_control(struct socket *so, u_long cmd, caddr_t arg, 336 struct ifnet *ifp, struct thread *p) 337 { 338 struct natmpcb *npcb; 339 340 npcb = (struct natmpcb *)so->so_pcb; 341 KASSERT(npcb != NULL, ("natm_usr_control: npcb == NULL")); 342 343 switch (cmd) { 344 case SIOCSIFADDR: 345 case SIOCSIFBRDADDR: 346 case SIOCSIFDSTADDR: 347 case SIOCSIFNETMASK: 348 /* 349 * Although we should pass any non-ATM ioctl requests 350 * down to driver, we filter some legacy INET requests. 351 * Drivers trust SIOCSIFADDR et al to come from an already 352 * privileged layer, and do not perform any credentials 353 * checks or input validation. 354 */ 355 return (EINVAL); 356 } 357 358 if (ifp == NULL || ifp->if_ioctl == NULL) 359 return (EOPNOTSUPP); 360 return ((*ifp->if_ioctl)(ifp, cmd, arg)); 361 } 362 363 static void 364 natm_usr_abort(struct socket *so) 365 { 366 367 } 368 369 static void 370 natm_usr_close(struct socket *so) 371 { 372 373 } 374 375 static int 376 natm_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *p) 377 { 378 379 return (EOPNOTSUPP); 380 } 381 382 static int 383 natm_usr_sockaddr(struct socket *so, struct sockaddr **nam) 384 { 385 386 return (EOPNOTSUPP); 387 } 388 389 /* xxx - should be const */ 390 struct pr_usrreqs natm_usrreqs = { 391 .pru_abort = natm_usr_abort, 392 .pru_attach = natm_usr_attach, 393 .pru_bind = natm_usr_bind, 394 .pru_connect = natm_usr_connect, 395 .pru_control = natm_usr_control, 396 .pru_detach = natm_usr_detach, 397 .pru_disconnect = natm_usr_disconnect, 398 .pru_peeraddr = natm_usr_peeraddr, 399 .pru_send = natm_usr_send, 400 .pru_shutdown = natm_usr_shutdown, 401 .pru_sockaddr = natm_usr_sockaddr, 402 .pru_close = natm_usr_close, 403 }; 404 405 /* 406 * natmintr: interrupt 407 * 408 * Note: we expect a socket pointer in rcvif rather than an interface 409 * pointer. We can get the interface pointer from the so's PCB if we really 410 * need it. 411 */ 412 void 413 natmintr(struct mbuf *m) 414 { 415 struct socket *so; 416 struct natmpcb *npcb; 417 418 #ifdef DIAGNOSTIC 419 M_ASSERTPKTHDR(m); 420 #endif 421 422 NATM_LOCK(); 423 npcb = (struct natmpcb *)m->m_pkthdr.rcvif; /* XXX: overloaded */ 424 so = npcb->npcb_socket; 425 426 npcb->npcb_inq--; 427 428 if (npcb->npcb_flags & NPCB_DRAIN) { 429 if (npcb->npcb_inq == 0) 430 free(npcb, M_PCB); /* done! */ 431 NATM_UNLOCK(); 432 m_freem(m); 433 return; 434 } 435 436 if (npcb->npcb_flags & NPCB_FREE) { 437 NATM_UNLOCK(); 438 m_freem(m); /* drop */ 439 return; 440 } 441 442 #ifdef NEED_TO_RESTORE_IFP 443 m->m_pkthdr.rcvif = npcb->npcb_ifp; 444 #else 445 #ifdef DIAGNOSTIC 446 m->m_pkthdr.rcvif = NULL; /* null it out to be safe */ 447 #endif 448 #endif 449 450 if (sbspace(&so->so_rcv) > m->m_pkthdr.len) { 451 #ifdef NATM_STAT 452 natm_sookcnt++; 453 natm_sookbytes += m->m_pkthdr.len; 454 #endif 455 sbappendrecord(&so->so_rcv, m); 456 sorwakeup(so); 457 NATM_UNLOCK(); 458 } else { 459 #ifdef NATM_STAT 460 natm_sodropcnt++; 461 natm_sodropbytes += m->m_pkthdr.len; 462 #endif 463 NATM_UNLOCK(); 464 m_freem(m); 465 } 466 } 467 468 /* 469 * natm0_sysctl: not used, but here in case we want to add something 470 * later... 471 */ 472 int 473 natm0_sysctl(SYSCTL_HANDLER_ARGS) 474 { 475 476 /* All sysctl names at this level are terminal. */ 477 return (ENOENT); 478 } 479 480 /* 481 * natm5_sysctl: not used, but here in case we want to add something 482 * later... 483 */ 484 int 485 natm5_sysctl(SYSCTL_HANDLER_ARGS) 486 { 487 488 /* All sysctl names at this level are terminal. */ 489 return (ENOENT); 490 }
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