Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_syscalls.c
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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 * 4. 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: releng/11.0/sys/netinet/sctp_syscalls.c 298066 2016-04-15 15:46:41Z pfg $"); 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 *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 = fgetsock(td, uap->sd, cap_rights_init(&rights, CAP_PEELOFF), 132 &head, &fflag); 133 if (error != 0) 134 goto done2; 135 if (head->so_proto->pr_protocol != IPPROTO_SCTP) { 136 error = EOPNOTSUPP; 137 goto done; 138 } 139 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name); 140 if (error != 0) 141 goto done; 142 /* 143 * At this point we know we do have a assoc to pull 144 * we proceed to get the fd setup. This may block 145 * but that is ok. 146 */ 147 148 error = falloc(td, &nfp, &fd, 0); 149 if (error != 0) 150 goto done; 151 td->td_retval[0] = fd; 152 153 CURVNET_SET(head->so_vnet); 154 so = sonewconn(head, SS_ISCONNECTED); 155 if (so == NULL) { 156 error = ENOMEM; 157 goto noconnection; 158 } 159 /* 160 * Before changing the flags on the socket, we have to bump the 161 * reference count. Otherwise, if the protocol calls sofree(), 162 * the socket will be released due to a zero refcount. 163 */ 164 SOCK_LOCK(so); 165 soref(so); /* file descriptor reference */ 166 SOCK_UNLOCK(so); 167 168 ACCEPT_LOCK(); 169 170 TAILQ_REMOVE(&head->so_comp, so, so_list); 171 head->so_qlen--; 172 so->so_state |= (head->so_state & SS_NBIO); 173 so->so_state &= ~SS_NOFDREF; 174 so->so_qstate &= ~SQ_COMP; 175 so->so_head = NULL; 176 ACCEPT_UNLOCK(); 177 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 178 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 179 if (error != 0) 180 goto noconnection; 181 if (head->so_sigio != NULL) 182 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 183 184 noconnection: 185 /* 186 * close the new descriptor, assuming someone hasn't ripped it 187 * out from under us. 188 */ 189 if (error != 0) 190 fdclose(td, nfp, fd); 191 192 /* 193 * Release explicitly held references before returning. 194 */ 195 CURVNET_RESTORE(); 196 done: 197 if (nfp != NULL) 198 fdrop(nfp, td); 199 fputsock(head); 200 done2: 201 return (error); 202 #else /* SCTP */ 203 return (EOPNOTSUPP); 204 #endif /* SCTP */ 205 } 206 207 int 208 sys_sctp_generic_sendmsg (td, uap) 209 struct thread *td; 210 struct sctp_generic_sendmsg_args /* { 211 int sd, 212 caddr_t msg, 213 int mlen, 214 caddr_t to, 215 __socklen_t tolen, 216 struct sctp_sndrcvinfo *sinfo, 217 int flags 218 } */ *uap; 219 { 220 #if (defined(INET) || defined(INET6)) && defined(SCTP) 221 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 222 struct socket *so; 223 struct file *fp = NULL; 224 struct sockaddr *to = NULL; 225 #ifdef KTRACE 226 struct uio *ktruio = NULL; 227 #endif 228 struct uio auio; 229 struct iovec iov[1]; 230 cap_rights_t rights; 231 int error = 0, len; 232 233 if (uap->sinfo != NULL) { 234 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 235 if (error != 0) 236 return (error); 237 u_sinfo = &sinfo; 238 } 239 240 cap_rights_init(&rights, CAP_SEND); 241 if (uap->tolen != 0) { 242 error = getsockaddr(&to, uap->to, uap->tolen); 243 if (error != 0) { 244 to = NULL; 245 goto sctp_bad2; 246 } 247 cap_rights_set(&rights, CAP_CONNECT); 248 } 249 250 AUDIT_ARG_FD(uap->sd); 251 error = getsock_cap(td, uap->sd, &rights, &fp, NULL); 252 if (error != 0) 253 goto sctp_bad; 254 #ifdef KTRACE 255 if (to && (KTRPOINT(td, KTR_STRUCT))) 256 ktrsockaddr(to); 257 #endif 258 259 iov[0].iov_base = uap->msg; 260 iov[0].iov_len = uap->mlen; 261 262 so = (struct socket *)fp->f_data; 263 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 264 error = EOPNOTSUPP; 265 goto sctp_bad; 266 } 267 #ifdef MAC 268 error = mac_socket_check_send(td->td_ucred, so); 269 if (error != 0) 270 goto sctp_bad; 271 #endif /* MAC */ 272 273 auio.uio_iov = iov; 274 auio.uio_iovcnt = 1; 275 auio.uio_segflg = UIO_USERSPACE; 276 auio.uio_rw = UIO_WRITE; 277 auio.uio_td = td; 278 auio.uio_offset = 0; /* XXX */ 279 auio.uio_resid = 0; 280 #ifdef KTRACE 281 if (KTRPOINT(td, KTR_GENIO)) 282 ktruio = cloneuio(&auio); 283 #endif /* KTRACE */ 284 len = auio.uio_resid = uap->mlen; 285 CURVNET_SET(so->so_vnet); 286 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 287 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 288 CURVNET_RESTORE(); 289 if (error != 0) { 290 if (auio.uio_resid != len && (error == ERESTART || 291 error == EINTR || error == EWOULDBLOCK)) 292 error = 0; 293 /* Generation of SIGPIPE can be controlled per socket. */ 294 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 295 !(uap->flags & MSG_NOSIGNAL)) { 296 PROC_LOCK(td->td_proc); 297 tdsignal(td, SIGPIPE); 298 PROC_UNLOCK(td->td_proc); 299 } 300 } 301 if (error == 0) 302 td->td_retval[0] = len - auio.uio_resid; 303 #ifdef KTRACE 304 if (ktruio != NULL) { 305 ktruio->uio_resid = td->td_retval[0]; 306 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 307 } 308 #endif /* KTRACE */ 309 sctp_bad: 310 if (fp != NULL) 311 fdrop(fp, td); 312 sctp_bad2: 313 free(to, M_SONAME); 314 return (error); 315 #else /* SCTP */ 316 return (EOPNOTSUPP); 317 #endif /* SCTP */ 318 } 319 320 int 321 sys_sctp_generic_sendmsg_iov(td, uap) 322 struct thread *td; 323 struct sctp_generic_sendmsg_iov_args /* { 324 int sd, 325 struct iovec *iov, 326 int iovlen, 327 caddr_t to, 328 __socklen_t tolen, 329 struct sctp_sndrcvinfo *sinfo, 330 int flags 331 } */ *uap; 332 { 333 #if (defined(INET) || defined(INET6)) && defined(SCTP) 334 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 335 struct socket *so; 336 struct file *fp = NULL; 337 struct sockaddr *to = NULL; 338 #ifdef KTRACE 339 struct uio *ktruio = NULL; 340 #endif 341 struct uio auio; 342 struct iovec *iov, *tiov; 343 cap_rights_t rights; 344 ssize_t len; 345 int error, i; 346 347 if (uap->sinfo != NULL) { 348 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 349 if (error != 0) 350 return (error); 351 u_sinfo = &sinfo; 352 } 353 cap_rights_init(&rights, CAP_SEND); 354 if (uap->tolen != 0) { 355 error = getsockaddr(&to, uap->to, uap->tolen); 356 if (error != 0) { 357 to = NULL; 358 goto sctp_bad2; 359 } 360 cap_rights_set(&rights, CAP_CONNECT); 361 } 362 363 AUDIT_ARG_FD(uap->sd); 364 error = getsock_cap(td, uap->sd, &rights, &fp, NULL); 365 if (error != 0) 366 goto sctp_bad1; 367 368 #ifdef COMPAT_FREEBSD32 369 if (SV_CURPROC_FLAG(SV_ILP32)) 370 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 371 uap->iovlen, &iov, EMSGSIZE); 372 else 373 #endif 374 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 375 if (error != 0) 376 goto sctp_bad1; 377 #ifdef KTRACE 378 if (to && (KTRPOINT(td, KTR_STRUCT))) 379 ktrsockaddr(to); 380 #endif 381 382 so = (struct socket *)fp->f_data; 383 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 384 error = EOPNOTSUPP; 385 goto sctp_bad; 386 } 387 #ifdef MAC 388 error = mac_socket_check_send(td->td_ucred, so); 389 if (error != 0) 390 goto sctp_bad; 391 #endif /* MAC */ 392 393 auio.uio_iov = iov; 394 auio.uio_iovcnt = uap->iovlen; 395 auio.uio_segflg = UIO_USERSPACE; 396 auio.uio_rw = UIO_WRITE; 397 auio.uio_td = td; 398 auio.uio_offset = 0; /* XXX */ 399 auio.uio_resid = 0; 400 tiov = iov; 401 for (i = 0; i <uap->iovlen; i++, tiov++) { 402 if ((auio.uio_resid += tiov->iov_len) < 0) { 403 error = EINVAL; 404 goto sctp_bad; 405 } 406 } 407 #ifdef KTRACE 408 if (KTRPOINT(td, KTR_GENIO)) 409 ktruio = cloneuio(&auio); 410 #endif /* KTRACE */ 411 len = auio.uio_resid; 412 CURVNET_SET(so->so_vnet); 413 error = sctp_lower_sosend(so, to, &auio, 414 (struct mbuf *)NULL, (struct mbuf *)NULL, 415 uap->flags, u_sinfo, td); 416 CURVNET_RESTORE(); 417 if (error != 0) { 418 if (auio.uio_resid != len && (error == ERESTART || 419 error == EINTR || error == EWOULDBLOCK)) 420 error = 0; 421 /* Generation of SIGPIPE can be controlled per socket */ 422 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 423 !(uap->flags & MSG_NOSIGNAL)) { 424 PROC_LOCK(td->td_proc); 425 tdsignal(td, SIGPIPE); 426 PROC_UNLOCK(td->td_proc); 427 } 428 } 429 if (error == 0) 430 td->td_retval[0] = len - auio.uio_resid; 431 #ifdef KTRACE 432 if (ktruio != NULL) { 433 ktruio->uio_resid = td->td_retval[0]; 434 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 435 } 436 #endif /* KTRACE */ 437 sctp_bad: 438 free(iov, M_IOV); 439 sctp_bad1: 440 if (fp != NULL) 441 fdrop(fp, td); 442 sctp_bad2: 443 free(to, M_SONAME); 444 return (error); 445 #else /* SCTP */ 446 return (EOPNOTSUPP); 447 #endif /* SCTP */ 448 } 449 450 int 451 sys_sctp_generic_recvmsg(td, uap) 452 struct thread *td; 453 struct sctp_generic_recvmsg_args /* { 454 int sd, 455 struct iovec *iov, 456 int iovlen, 457 struct sockaddr *from, 458 __socklen_t *fromlenaddr, 459 struct sctp_sndrcvinfo *sinfo, 460 int *msg_flags 461 } */ *uap; 462 { 463 #if (defined(INET) || defined(INET6)) && defined(SCTP) 464 uint8_t sockbufstore[256]; 465 struct uio auio; 466 struct iovec *iov, *tiov; 467 struct sctp_sndrcvinfo sinfo; 468 struct socket *so; 469 struct file *fp = NULL; 470 struct sockaddr *fromsa; 471 cap_rights_t rights; 472 #ifdef KTRACE 473 struct uio *ktruio = NULL; 474 #endif 475 ssize_t len; 476 int error, fromlen, i, msg_flags; 477 478 AUDIT_ARG_FD(uap->sd); 479 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_RECV), 480 &fp, NULL); 481 if (error != 0) 482 return (error); 483 #ifdef COMPAT_FREEBSD32 484 if (SV_CURPROC_FLAG(SV_ILP32)) 485 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 486 uap->iovlen, &iov, EMSGSIZE); 487 else 488 #endif 489 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 490 if (error != 0) 491 goto out1; 492 493 so = fp->f_data; 494 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 495 error = EOPNOTSUPP; 496 goto out; 497 } 498 #ifdef MAC 499 error = mac_socket_check_receive(td->td_ucred, so); 500 if (error != 0) 501 goto out; 502 #endif /* MAC */ 503 504 if (uap->fromlenaddr != NULL) { 505 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen)); 506 if (error != 0) 507 goto out; 508 } else { 509 fromlen = 0; 510 } 511 if (uap->msg_flags) { 512 error = copyin(uap->msg_flags, &msg_flags, sizeof (int)); 513 if (error != 0) 514 goto out; 515 } else { 516 msg_flags = 0; 517 } 518 auio.uio_iov = iov; 519 auio.uio_iovcnt = uap->iovlen; 520 auio.uio_segflg = UIO_USERSPACE; 521 auio.uio_rw = UIO_READ; 522 auio.uio_td = td; 523 auio.uio_offset = 0; /* XXX */ 524 auio.uio_resid = 0; 525 tiov = iov; 526 for (i = 0; i <uap->iovlen; i++, tiov++) { 527 if ((auio.uio_resid += tiov->iov_len) < 0) { 528 error = EINVAL; 529 goto out; 530 } 531 } 532 len = auio.uio_resid; 533 fromsa = (struct sockaddr *)sockbufstore; 534 535 #ifdef KTRACE 536 if (KTRPOINT(td, KTR_GENIO)) 537 ktruio = cloneuio(&auio); 538 #endif /* KTRACE */ 539 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo)); 540 CURVNET_SET(so->so_vnet); 541 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL, 542 fromsa, fromlen, &msg_flags, 543 (struct sctp_sndrcvinfo *)&sinfo, 1); 544 CURVNET_RESTORE(); 545 if (error != 0) { 546 if (auio.uio_resid != len && (error == ERESTART || 547 error == EINTR || error == EWOULDBLOCK)) 548 error = 0; 549 } else { 550 if (uap->sinfo) 551 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo)); 552 } 553 #ifdef KTRACE 554 if (ktruio != NULL) { 555 ktruio->uio_resid = len - auio.uio_resid; 556 ktrgenio(uap->sd, UIO_READ, ktruio, error); 557 } 558 #endif /* KTRACE */ 559 if (error != 0) 560 goto out; 561 td->td_retval[0] = len - auio.uio_resid; 562 563 if (fromlen && uap->from) { 564 len = fromlen; 565 if (len <= 0 || fromsa == NULL) 566 len = 0; 567 else { 568 len = MIN(len, fromsa->sa_len); 569 error = copyout(fromsa, uap->from, (size_t)len); 570 if (error != 0) 571 goto out; 572 } 573 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t)); 574 if (error != 0) 575 goto out; 576 } 577 #ifdef KTRACE 578 if (KTRPOINT(td, KTR_STRUCT)) 579 ktrsockaddr(fromsa); 580 #endif 581 if (uap->msg_flags) { 582 error = copyout(&msg_flags, uap->msg_flags, sizeof (int)); 583 if (error != 0) 584 goto out; 585 } 586 out: 587 free(iov, M_IOV); 588 out1: 589 if (fp != NULL) 590 fdrop(fp, td); 591 592 return (error); 593 #else /* SCTP */ 594 return (EOPNOTSUPP); 595 #endif /* SCTP */ 596 }
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