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/11.2/sys/netinet/sctp_syscalls.c 321322 2017-07-21 06:48:47Z kib $"); 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_F(sctp_peeloff, SYF_CAPENABLED), 86 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED), 87 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED), 88 SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED), 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 = sonewconn(head, SS_ISCONNECTED); 156 if (so == NULL) { 157 error = ENOMEM; 158 goto noconnection; 159 } 160 /* 161 * Before changing the flags on the socket, we have to bump the 162 * reference count. Otherwise, if the protocol calls sofree(), 163 * the socket will be released due to a zero refcount. 164 */ 165 SOCK_LOCK(so); 166 soref(so); /* file descriptor reference */ 167 SOCK_UNLOCK(so); 168 169 ACCEPT_LOCK(); 170 171 TAILQ_REMOVE(&head->so_comp, so, so_list); 172 head->so_qlen--; 173 so->so_state |= (head->so_state & SS_NBIO); 174 so->so_state &= ~SS_NOFDREF; 175 so->so_qstate &= ~SQ_COMP; 176 so->so_head = NULL; 177 ACCEPT_UNLOCK(); 178 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 179 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 180 if (error != 0) 181 goto noconnection; 182 if (head->so_sigio != NULL) 183 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 184 185 noconnection: 186 /* 187 * close the new descriptor, assuming someone hasn't ripped it 188 * out from under us. 189 */ 190 if (error != 0) 191 fdclose(td, nfp, fd); 192 193 /* 194 * Release explicitly held references before returning. 195 */ 196 CURVNET_RESTORE(); 197 done: 198 if (nfp != NULL) 199 fdrop(nfp, td); 200 fdrop(headfp, td); 201 done2: 202 return (error); 203 #else /* SCTP */ 204 return (EOPNOTSUPP); 205 #endif /* SCTP */ 206 } 207 208 int 209 sys_sctp_generic_sendmsg (td, uap) 210 struct thread *td; 211 struct sctp_generic_sendmsg_args /* { 212 int sd, 213 caddr_t msg, 214 int mlen, 215 caddr_t to, 216 __socklen_t tolen, 217 struct sctp_sndrcvinfo *sinfo, 218 int flags 219 } */ *uap; 220 { 221 #if (defined(INET) || defined(INET6)) && defined(SCTP) 222 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 223 struct socket *so; 224 struct file *fp = NULL; 225 struct sockaddr *to = NULL; 226 #ifdef KTRACE 227 struct uio *ktruio = NULL; 228 #endif 229 struct uio auio; 230 struct iovec iov[1]; 231 cap_rights_t rights; 232 int error = 0, len; 233 234 if (uap->sinfo != NULL) { 235 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 236 if (error != 0) 237 return (error); 238 u_sinfo = &sinfo; 239 } 240 241 cap_rights_init(&rights, CAP_SEND); 242 if (uap->tolen != 0) { 243 error = getsockaddr(&to, uap->to, uap->tolen); 244 if (error != 0) { 245 to = NULL; 246 goto sctp_bad2; 247 } 248 cap_rights_set(&rights, CAP_CONNECT); 249 } 250 251 AUDIT_ARG_FD(uap->sd); 252 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL); 253 if (error != 0) 254 goto sctp_bad; 255 #ifdef KTRACE 256 if (to && (KTRPOINT(td, KTR_STRUCT))) 257 ktrsockaddr(to); 258 #endif 259 260 iov[0].iov_base = uap->msg; 261 iov[0].iov_len = uap->mlen; 262 263 so = (struct socket *)fp->f_data; 264 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 265 error = EOPNOTSUPP; 266 goto sctp_bad; 267 } 268 #ifdef MAC 269 error = mac_socket_check_send(td->td_ucred, so); 270 if (error != 0) 271 goto sctp_bad; 272 #endif /* MAC */ 273 274 auio.uio_iov = iov; 275 auio.uio_iovcnt = 1; 276 auio.uio_segflg = UIO_USERSPACE; 277 auio.uio_rw = UIO_WRITE; 278 auio.uio_td = td; 279 auio.uio_offset = 0; /* XXX */ 280 auio.uio_resid = 0; 281 #ifdef KTRACE 282 if (KTRPOINT(td, KTR_GENIO)) 283 ktruio = cloneuio(&auio); 284 #endif /* KTRACE */ 285 len = auio.uio_resid = uap->mlen; 286 CURVNET_SET(so->so_vnet); 287 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 288 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 289 CURVNET_RESTORE(); 290 if (error != 0) { 291 if (auio.uio_resid != len && (error == ERESTART || 292 error == EINTR || error == EWOULDBLOCK)) 293 error = 0; 294 /* Generation of SIGPIPE can be controlled per socket. */ 295 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 296 !(uap->flags & MSG_NOSIGNAL)) { 297 PROC_LOCK(td->td_proc); 298 tdsignal(td, SIGPIPE); 299 PROC_UNLOCK(td->td_proc); 300 } 301 } 302 if (error == 0) 303 td->td_retval[0] = len - auio.uio_resid; 304 #ifdef KTRACE 305 if (ktruio != NULL) { 306 ktruio->uio_resid = td->td_retval[0]; 307 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 308 } 309 #endif /* KTRACE */ 310 sctp_bad: 311 if (fp != NULL) 312 fdrop(fp, td); 313 sctp_bad2: 314 free(to, M_SONAME); 315 return (error); 316 #else /* SCTP */ 317 return (EOPNOTSUPP); 318 #endif /* SCTP */ 319 } 320 321 int 322 sys_sctp_generic_sendmsg_iov(td, uap) 323 struct thread *td; 324 struct sctp_generic_sendmsg_iov_args /* { 325 int sd, 326 struct iovec *iov, 327 int iovlen, 328 caddr_t to, 329 __socklen_t tolen, 330 struct sctp_sndrcvinfo *sinfo, 331 int flags 332 } */ *uap; 333 { 334 #if (defined(INET) || defined(INET6)) && defined(SCTP) 335 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 336 struct socket *so; 337 struct file *fp = NULL; 338 struct sockaddr *to = NULL; 339 #ifdef KTRACE 340 struct uio *ktruio = NULL; 341 #endif 342 struct uio auio; 343 struct iovec *iov, *tiov; 344 cap_rights_t rights; 345 ssize_t len; 346 int error, i; 347 348 if (uap->sinfo != NULL) { 349 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 350 if (error != 0) 351 return (error); 352 u_sinfo = &sinfo; 353 } 354 cap_rights_init(&rights, CAP_SEND); 355 if (uap->tolen != 0) { 356 error = getsockaddr(&to, uap->to, uap->tolen); 357 if (error != 0) { 358 to = NULL; 359 goto sctp_bad2; 360 } 361 cap_rights_set(&rights, CAP_CONNECT); 362 } 363 364 AUDIT_ARG_FD(uap->sd); 365 error = getsock_cap(td, uap->sd, &rights, &fp, NULL, NULL); 366 if (error != 0) 367 goto sctp_bad1; 368 369 #ifdef COMPAT_FREEBSD32 370 if (SV_CURPROC_FLAG(SV_ILP32)) 371 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 372 uap->iovlen, &iov, EMSGSIZE); 373 else 374 #endif 375 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 376 if (error != 0) 377 goto sctp_bad1; 378 #ifdef KTRACE 379 if (to && (KTRPOINT(td, KTR_STRUCT))) 380 ktrsockaddr(to); 381 #endif 382 383 so = (struct socket *)fp->f_data; 384 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 385 error = EOPNOTSUPP; 386 goto sctp_bad; 387 } 388 #ifdef MAC 389 error = mac_socket_check_send(td->td_ucred, so); 390 if (error != 0) 391 goto sctp_bad; 392 #endif /* MAC */ 393 394 auio.uio_iov = iov; 395 auio.uio_iovcnt = uap->iovlen; 396 auio.uio_segflg = UIO_USERSPACE; 397 auio.uio_rw = UIO_WRITE; 398 auio.uio_td = td; 399 auio.uio_offset = 0; /* XXX */ 400 auio.uio_resid = 0; 401 tiov = iov; 402 for (i = 0; i <uap->iovlen; i++, tiov++) { 403 if ((auio.uio_resid += tiov->iov_len) < 0) { 404 error = EINVAL; 405 goto sctp_bad; 406 } 407 } 408 #ifdef KTRACE 409 if (KTRPOINT(td, KTR_GENIO)) 410 ktruio = cloneuio(&auio); 411 #endif /* KTRACE */ 412 len = auio.uio_resid; 413 CURVNET_SET(so->so_vnet); 414 error = sctp_lower_sosend(so, to, &auio, 415 (struct mbuf *)NULL, (struct mbuf *)NULL, 416 uap->flags, u_sinfo, td); 417 CURVNET_RESTORE(); 418 if (error != 0) { 419 if (auio.uio_resid != len && (error == ERESTART || 420 error == EINTR || error == EWOULDBLOCK)) 421 error = 0; 422 /* Generation of SIGPIPE can be controlled per socket */ 423 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 424 !(uap->flags & MSG_NOSIGNAL)) { 425 PROC_LOCK(td->td_proc); 426 tdsignal(td, SIGPIPE); 427 PROC_UNLOCK(td->td_proc); 428 } 429 } 430 if (error == 0) 431 td->td_retval[0] = len - auio.uio_resid; 432 #ifdef KTRACE 433 if (ktruio != NULL) { 434 ktruio->uio_resid = td->td_retval[0]; 435 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 436 } 437 #endif /* KTRACE */ 438 sctp_bad: 439 free(iov, M_IOV); 440 sctp_bad1: 441 if (fp != NULL) 442 fdrop(fp, td); 443 sctp_bad2: 444 free(to, M_SONAME); 445 return (error); 446 #else /* SCTP */ 447 return (EOPNOTSUPP); 448 #endif /* SCTP */ 449 } 450 451 int 452 sys_sctp_generic_recvmsg(td, uap) 453 struct thread *td; 454 struct sctp_generic_recvmsg_args /* { 455 int sd, 456 struct iovec *iov, 457 int iovlen, 458 struct sockaddr *from, 459 __socklen_t *fromlenaddr, 460 struct sctp_sndrcvinfo *sinfo, 461 int *msg_flags 462 } */ *uap; 463 { 464 #if (defined(INET) || defined(INET6)) && defined(SCTP) 465 uint8_t sockbufstore[256]; 466 struct uio auio; 467 struct iovec *iov, *tiov; 468 struct sctp_sndrcvinfo sinfo; 469 struct socket *so; 470 struct file *fp = NULL; 471 struct sockaddr *fromsa; 472 cap_rights_t rights; 473 #ifdef KTRACE 474 struct uio *ktruio = NULL; 475 #endif 476 ssize_t len; 477 int error, fromlen, i, msg_flags; 478 479 AUDIT_ARG_FD(uap->sd); 480 error = getsock_cap(td, uap->sd, cap_rights_init(&rights, CAP_RECV), 481 &fp, NULL, NULL); 482 if (error != 0) 483 return (error); 484 #ifdef COMPAT_FREEBSD32 485 if (SV_CURPROC_FLAG(SV_ILP32)) 486 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 487 uap->iovlen, &iov, EMSGSIZE); 488 else 489 #endif 490 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 491 if (error != 0) 492 goto out1; 493 494 so = fp->f_data; 495 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 496 error = EOPNOTSUPP; 497 goto out; 498 } 499 #ifdef MAC 500 error = mac_socket_check_receive(td->td_ucred, so); 501 if (error != 0) 502 goto out; 503 #endif /* MAC */ 504 505 if (uap->fromlenaddr != NULL) { 506 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen)); 507 if (error != 0) 508 goto out; 509 } else { 510 fromlen = 0; 511 } 512 if (uap->msg_flags) { 513 error = copyin(uap->msg_flags, &msg_flags, sizeof (int)); 514 if (error != 0) 515 goto out; 516 } else { 517 msg_flags = 0; 518 } 519 auio.uio_iov = iov; 520 auio.uio_iovcnt = uap->iovlen; 521 auio.uio_segflg = UIO_USERSPACE; 522 auio.uio_rw = UIO_READ; 523 auio.uio_td = td; 524 auio.uio_offset = 0; /* XXX */ 525 auio.uio_resid = 0; 526 tiov = iov; 527 for (i = 0; i <uap->iovlen; i++, tiov++) { 528 if ((auio.uio_resid += tiov->iov_len) < 0) { 529 error = EINVAL; 530 goto out; 531 } 532 } 533 len = auio.uio_resid; 534 fromsa = (struct sockaddr *)sockbufstore; 535 536 #ifdef KTRACE 537 if (KTRPOINT(td, KTR_GENIO)) 538 ktruio = cloneuio(&auio); 539 #endif /* KTRACE */ 540 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo)); 541 CURVNET_SET(so->so_vnet); 542 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL, 543 fromsa, fromlen, &msg_flags, 544 (struct sctp_sndrcvinfo *)&sinfo, 1); 545 CURVNET_RESTORE(); 546 if (error != 0) { 547 if (auio.uio_resid != len && (error == ERESTART || 548 error == EINTR || error == EWOULDBLOCK)) 549 error = 0; 550 } else { 551 if (uap->sinfo) 552 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo)); 553 } 554 #ifdef KTRACE 555 if (ktruio != NULL) { 556 ktruio->uio_resid = len - auio.uio_resid; 557 ktrgenio(uap->sd, UIO_READ, ktruio, error); 558 } 559 #endif /* KTRACE */ 560 if (error != 0) 561 goto out; 562 td->td_retval[0] = len - auio.uio_resid; 563 564 if (fromlen && uap->from) { 565 len = fromlen; 566 if (len <= 0 || fromsa == NULL) 567 len = 0; 568 else { 569 len = MIN(len, fromsa->sa_len); 570 error = copyout(fromsa, uap->from, (size_t)len); 571 if (error != 0) 572 goto out; 573 } 574 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t)); 575 if (error != 0) 576 goto out; 577 } 578 #ifdef KTRACE 579 if (KTRPOINT(td, KTR_STRUCT)) 580 ktrsockaddr(fromsa); 581 #endif 582 if (uap->msg_flags) { 583 error = copyout(&msg_flags, uap->msg_flags, sizeof (int)); 584 if (error != 0) 585 goto out; 586 } 587 out: 588 free(iov, M_IOV); 589 out1: 590 if (fp != NULL) 591 fdrop(fp, td); 592 593 return (error); 594 #else /* SCTP */ 595 return (EOPNOTSUPP); 596 #endif /* SCTP */ 597 }
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