1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1990, 1993 3 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_capsicum.h" 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 #include "opt_sctp.h" 38 #include "opt_compat.h" 39 #include "opt_ktrace.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/capsicum.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/sysproto.h> 48 #include <sys/malloc.h> 49 #include <sys/filedesc.h> 50 #include <sys/event.h> 51 #include <sys/proc.h> 52 #include <sys/fcntl.h> 53 #include <sys/file.h> 54 #include <sys/filio.h> 55 #include <sys/jail.h> 56 #include <sys/mount.h> 57 #include <sys/mbuf.h> 58 #include <sys/protosw.h> 59 #include <sys/sf_buf.h> 60 #include <sys/sysent.h> 61 #include <sys/socket.h> 62 #include <sys/socketvar.h> 63 #include <sys/signalvar.h> 64 #include <sys/syscall.h> 65 #include <sys/syscallsubr.h> 66 #include <sys/sysctl.h> 67 #include <sys/uio.h> 68 #include <sys/vnode.h> 69 #ifdef KTRACE 70 #include <sys/ktrace.h> 71 #endif 72 #ifdef COMPAT_FREEBSD32 73 #include <compat/freebsd32/freebsd32_util.h> 74 #endif 75 76 #include <net/vnet.h> 77 78 #include <security/audit/audit.h> 79 #include <security/mac/mac_framework.h> 80 81 #include <netinet/sctp.h> 82 #include <netinet/sctp_peeloff.h> 83 84 static struct syscall_helper_data sctp_syscalls[] = { 85 SYSCALL_INIT_HELPER(sctp_peeloff), 86 SYSCALL_INIT_HELPER(sctp_generic_sendmsg), 87 SYSCALL_INIT_HELPER(sctp_generic_sendmsg_iov), 88 SYSCALL_INIT_HELPER(sctp_generic_recvmsg), 89 SYSCALL_INIT_LAST 90 }; 91 92 static void 93 sctp_syscalls_init(void *unused __unused) 94 { 95 int error; 96 97 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC); 98 KASSERT((error == 0), 99 ("%s: syscall_helper_register failed for sctp syscalls", __func__)); 100 #ifdef COMPAT_FREEBSD32 101 error = syscall32_helper_register(sctp_syscalls, SY_THR_STATIC); 102 KASSERT((error == 0), 103 ("%s: syscall32_helper_register failed for sctp syscalls", 104 __func__)); 105 #endif 106 } 107 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL); 108 109 /* 110 * SCTP syscalls. 111 * Functionality only compiled in if SCTP is defined in the kernel Makefile, 112 * otherwise all return EOPNOTSUPP. 113 * XXX: We should make this loadable one day. 114 */ 115 int 116 sys_sctp_peeloff(td, uap) 117 struct thread *td; 118 struct sctp_peeloff_args /* { 119 int sd; 120 caddr_t name; 121 } */ *uap; 122 { 123 #if (defined(INET) || defined(INET6)) && defined(SCTP) 124 struct file *headfp, *nfp = NULL; 125 struct socket *head, *so; 126 cap_rights_t rights; 127 u_int fflag; 128 int error, fd; 129 130 AUDIT_ARG_FD(uap->sd); 131 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_PEELOFF), 132 &headfp, &fflag, NULL); 133 if (error != 0) 134 goto done2; 135 head = headfp->f_data; 136 if (head->so_proto->pr_protocol != IPPROTO_SCTP) { 137 error = EOPNOTSUPP; 138 goto done; 139 } 140 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name); 141 if (error != 0) 142 goto done; 143 /* 144 * At this point we know we do have a assoc to pull 145 * we proceed to get the fd setup. This may block 146 * but that is ok. 147 */ 148 149 error = falloc(td, &nfp, &fd, 0); 150 if (error != 0) 151 goto done; 152 td->td_retval[0] = fd; 153 154 CURVNET_SET(head->so_vnet); 155 so = sopeeloff(head); 156 if (so == NULL) { 157 error = ENOMEM; 158 goto noconnection; 159 } 160 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 161 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 162 if (error != 0) 163 goto noconnection; 164 if (head->so_sigio != NULL) 165 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 166 167 noconnection: 168 /* 169 * close the new descriptor, assuming someone hasn't ripped it 170 * out from under us. 171 */ 172 if (error != 0) 173 fdclose(td, nfp, fd); 174 175 /* 176 * Release explicitly held references before returning. 177 */ 178 CURVNET_RESTORE(); 179 done: 180 if (nfp != NULL) 181 fdrop(nfp, td); 182 fdrop(headfp, td); 183 done2: 184 return (error); 185 #else /* SCTP */ 186 return (EOPNOTSUPP); 187 #endif /* SCTP */ 188 } 189 190 int 191 sys_sctp_generic_sendmsg (td, uap) 192 struct thread *td; 193 struct sctp_generic_sendmsg_args /* { 194 int sd, 195 caddr_t msg, 196 int mlen, 197 caddr_t to, 198 __socklen_t tolen, 199 struct sctp_sndrcvinfo *sinfo, 200 int flags 201 } */ *uap; 202 { 203 #if (defined(INET) || defined(INET6)) && defined(SCTP) 204 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 205 struct socket *so; 206 struct file *fp = NULL; 207 struct sockaddr *to = NULL; 208 #ifdef KTRACE 209 struct uio *ktruio = NULL; 210 #endif 211 struct uio auio; 212 struct iovec iov[1]; 213 cap_rights_t rights; 214 int error = 0, len; 215 216 if (uap->sinfo != NULL) { 217 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 218 if (error != 0) 219 return (error); 220 u_sinfo = &sinfo; 221 } 222 223 cap_rights_init(&rights, CAP_SEND); 224 if (uap->tolen != 0) { 225 error = getsockaddr(&to, uap->to, uap->tolen); 226 if (error != 0) { 227 to = NULL; 228 goto sctp_bad2; 229 } 230 cap_rights_set(&rights, CAP_CONNECT); 231 } 232 233 AUDIT_ARG_FD(uap->sd); 234 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL); 235 if (error != 0) 236 goto sctp_bad; 237 #ifdef KTRACE 238 if (to && (KTRPOINT(td, KTR_STRUCT))) 239 ktrsockaddr(to); 240 #endif 241 242 iov[0].iov_base = uap->msg; 243 iov[0].iov_len = uap->mlen; 244 245 so = (struct socket *)fp->f_data; 246 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 247 error = EOPNOTSUPP; 248 goto sctp_bad; 249 } 250 #ifdef MAC 251 error = mac_socket_check_send(td->td_ucred, so); 252 if (error != 0) 253 goto sctp_bad; 254 #endif /* MAC */ 255 256 auio.uio_iov = iov; 257 auio.uio_iovcnt = 1; 258 auio.uio_segflg = UIO_USERSPACE; 259 auio.uio_rw = UIO_WRITE; 260 auio.uio_td = td; 261 auio.uio_offset = 0; /* XXX */ 262 auio.uio_resid = 0; 263 #ifdef KTRACE 264 if (KTRPOINT(td, KTR_GENIO)) 265 ktruio = cloneuio(&auio); 266 #endif /* KTRACE */ 267 len = auio.uio_resid = uap->mlen; 268 CURVNET_SET(so->so_vnet); 269 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 270 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 271 CURVNET_RESTORE(); 272 if (error != 0) { 273 if (auio.uio_resid != len && (error == ERESTART || 274 error == EINTR || error == EWOULDBLOCK)) 275 error = 0; 276 /* Generation of SIGPIPE can be controlled per socket. */ 277 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 278 !(uap->flags & MSG_NOSIGNAL)) { 279 PROC_LOCK(td->td_proc); 280 tdsignal(td, SIGPIPE); 281 PROC_UNLOCK(td->td_proc); 282 } 283 } 284 if (error == 0) 285 td->td_retval[0] = len - auio.uio_resid; 286 #ifdef KTRACE 287 if (ktruio != NULL) { 288 ktruio->uio_resid = td->td_retval[0]; 289 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 290 } 291 #endif /* KTRACE */ 292 sctp_bad: 293 if (fp != NULL) 294 fdrop(fp, td); 295 sctp_bad2: 296 free(to, M_SONAME); 297 return (error); 298 #else /* SCTP */ 299 return (EOPNOTSUPP); 300 #endif /* SCTP */ 301 } 302 303 int 304 sys_sctp_generic_sendmsg_iov(td, uap) 305 struct thread *td; 306 struct sctp_generic_sendmsg_iov_args /* { 307 int sd, 308 struct iovec *iov, 309 int iovlen, 310 caddr_t to, 311 __socklen_t tolen, 312 struct sctp_sndrcvinfo *sinfo, 313 int flags 314 } */ *uap; 315 { 316 #if (defined(INET) || defined(INET6)) && defined(SCTP) 317 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 318 struct socket *so; 319 struct file *fp = NULL; 320 struct sockaddr *to = NULL; 321 #ifdef KTRACE 322 struct uio *ktruio = NULL; 323 #endif 324 struct uio auio; 325 struct iovec *iov, *tiov; 326 cap_rights_t rights; 327 ssize_t len; 328 int error, i; 329 330 if (uap->sinfo != NULL) { 331 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 332 if (error != 0) 333 return (error); 334 u_sinfo = &sinfo; 335 } 336 cap_rights_init(&rights, CAP_SEND); 337 if (uap->tolen != 0) { 338 error = getsockaddr(&to, uap->to, uap->tolen); 339 if (error != 0) { 340 to = NULL; 341 goto sctp_bad2; 342 } 343 cap_rights_set(&rights, CAP_CONNECT); 344 } 345 346 AUDIT_ARG_FD(uap->sd); 347 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL); 348 if (error != 0) 349 goto sctp_bad1; 350 351 #ifdef COMPAT_FREEBSD32 352 if (SV_CURPROC_FLAG(SV_ILP32)) 353 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 354 uap->iovlen, &iov, EMSGSIZE); 355 else 356 #endif 357 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 358 if (error != 0) 359 goto sctp_bad1; 360 #ifdef KTRACE 361 if (to && (KTRPOINT(td, KTR_STRUCT))) 362 ktrsockaddr(to); 363 #endif 364 365 so = (struct socket *)fp->f_data; 366 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 367 error = EOPNOTSUPP; 368 goto sctp_bad; 369 } 370 #ifdef MAC 371 error = mac_socket_check_send(td->td_ucred, so); 372 if (error != 0) 373 goto sctp_bad; 374 #endif /* MAC */ 375 376 auio.uio_iov = iov; 377 auio.uio_iovcnt = uap->iovlen; 378 auio.uio_segflg = UIO_USERSPACE; 379 auio.uio_rw = UIO_WRITE; 380 auio.uio_td = td; 381 auio.uio_offset = 0; /* XXX */ 382 auio.uio_resid = 0; 383 tiov = iov; 384 for (i = 0; i <uap->iovlen; i++, tiov++) { 385 if ((auio.uio_resid += tiov->iov_len) < 0) { 386 error = EINVAL; 387 goto sctp_bad; 388 } 389 } 390 #ifdef KTRACE 391 if (KTRPOINT(td, KTR_GENIO)) 392 ktruio = cloneuio(&auio); 393 #endif /* KTRACE */ 394 len = auio.uio_resid; 395 CURVNET_SET(so->so_vnet); 396 error = sctp_lower_sosend(so, to, &auio, 397 (struct mbuf *)NULL, (struct mbuf *)NULL, 398 uap->flags, u_sinfo, td); 399 CURVNET_RESTORE(); 400 if (error != 0) { 401 if (auio.uio_resid != len && (error == ERESTART || 402 error == EINTR || error == EWOULDBLOCK)) 403 error = 0; 404 /* Generation of SIGPIPE can be controlled per socket */ 405 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 406 !(uap->flags & MSG_NOSIGNAL)) { 407 PROC_LOCK(td->td_proc); 408 tdsignal(td, SIGPIPE); 409 PROC_UNLOCK(td->td_proc); 410 } 411 } 412 if (error == 0) 413 td->td_retval[0] = len - auio.uio_resid; 414 #ifdef KTRACE 415 if (ktruio != NULL) { 416 ktruio->uio_resid = td->td_retval[0]; 417 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 418 } 419 #endif /* KTRACE */ 420 sctp_bad: 421 free(iov, M_IOV); 422 sctp_bad1: 423 if (fp != NULL) 424 fdrop(fp, td); 425 sctp_bad2: 426 free(to, M_SONAME); 427 return (error); 428 #else /* SCTP */ 429 return (EOPNOTSUPP); 430 #endif /* SCTP */ 431 } 432 433 int 434 sys_sctp_generic_recvmsg(td, uap) 435 struct thread *td; 436 struct sctp_generic_recvmsg_args /* { 437 int sd, 438 struct iovec *iov, 439 int iovlen, 440 struct sockaddr *from, 441 __socklen_t *fromlenaddr, 442 struct sctp_sndrcvinfo *sinfo, 443 int *msg_flags 444 } */ *uap; 445 { 446 #if (defined(INET) || defined(INET6)) && defined(SCTP) 447 uint8_t sockbufstore[256]; 448 struct uio auio; 449 struct iovec *iov, *tiov; 450 struct sctp_sndrcvinfo sinfo; 451 struct socket *so; 452 struct file *fp = NULL; 453 struct sockaddr *fromsa; 454 cap_rights_t rights; 455 #ifdef KTRACE 456 struct uio *ktruio = NULL; 457 #endif 458 ssize_t len; 459 int error, fromlen, i, msg_flags; 460 461 AUDIT_ARG_FD(uap->sd); 462 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_RECV), 463 &fp, NULL, NULL); 464 if (error != 0) 465 return (error); 466 #ifdef COMPAT_FREEBSD32 467 if (SV_CURPROC_FLAG(SV_ILP32)) 468 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 469 uap->iovlen, &iov, EMSGSIZE); 470 else 471 #endif 472 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 473 if (error != 0) 474 goto out1; 475 476 so = fp->f_data; 477 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 478 error = EOPNOTSUPP; 479 goto out; 480 } 481 #ifdef MAC 482 error = mac_socket_check_receive(td->td_ucred, so); 483 if (error != 0) 484 goto out; 485 #endif /* MAC */ 486 487 if (uap->fromlenaddr != NULL) { 488 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen)); 489 if (error != 0) 490 goto out; 491 } else { 492 fromlen = 0; 493 } 494 if (uap->msg_flags) { 495 error = copyin(uap->msg_flags, &msg_flags, sizeof (int)); 496 if (error != 0) 497 goto out; 498 } else { 499 msg_flags = 0; 500 } 501 auio.uio_iov = iov; 502 auio.uio_iovcnt = uap->iovlen; 503 auio.uio_segflg = UIO_USERSPACE; 504 auio.uio_rw = UIO_READ; 505 auio.uio_td = td; 506 auio.uio_offset = 0; /* XXX */ 507 auio.uio_resid = 0; 508 tiov = iov; 509 for (i = 0; i <uap->iovlen; i++, tiov++) { 510 if ((auio.uio_resid += tiov->iov_len) < 0) { 511 error = EINVAL; 512 goto out; 513 } 514 } 515 len = auio.uio_resid; 516 fromsa = (struct sockaddr *)sockbufstore; 517 518 #ifdef KTRACE 519 if (KTRPOINT(td, KTR_GENIO)) 520 ktruio = cloneuio(&auio); 521 #endif /* KTRACE */ 522 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo)); 523 CURVNET_SET(so->so_vnet); 524 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL, 525 fromsa, fromlen, &msg_flags, 526 (struct sctp_sndrcvinfo *)&sinfo, 1); 527 CURVNET_RESTORE(); 528 if (error != 0) { 529 if (auio.uio_resid != len && (error == ERESTART || 530 error == EINTR || error == EWOULDBLOCK)) 531 error = 0; 532 } else { 533 if (uap->sinfo) 534 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo)); 535 } 536 #ifdef KTRACE 537 if (ktruio != NULL) { 538 ktruio->uio_resid = len - auio.uio_resid; 539 ktrgenio(uap->sd, UIO_READ, ktruio, error); 540 } 541 #endif /* KTRACE */ 542 if (error != 0) 543 goto out; 544 td->td_retval[0] = len - auio.uio_resid; 545 546 if (fromlen && uap->from) { 547 len = fromlen; 548 if (len <= 0 || fromsa == NULL) 549 len = 0; 550 else { 551 len = MIN(len, fromsa->sa_len); 552 error = copyout(fromsa, uap->from, (size_t)len); 553 if (error != 0) 554 goto out; 555 } 556 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t)); 557 if (error != 0) 558 goto out; 559 } 560 #ifdef KTRACE 561 if (KTRPOINT(td, KTR_STRUCT)) 562 ktrsockaddr(fromsa); 563 #endif 564 if (uap->msg_flags) { 565 error = copyout(&msg_flags, uap->msg_flags, sizeof (int)); 566 if (error != 0) 567 goto out; 568 } 569 out: 570 free(iov, M_IOV); 571 out1: 572 if (fp != NULL) 573 fdrop(fp, td); 574 575 return (error); 576 #else /* SCTP */ 577 return (EOPNOTSUPP); 578 #endif /* SCTP */ 579 } 580