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 "opt_capsicum.h" 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 #include "opt_sctp.h" 35 #include "opt_ktrace.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/capsicum.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/sysproto.h> 44 #include <sys/malloc.h> 45 #include <sys/filedesc.h> 46 #include <sys/event.h> 47 #include <sys/proc.h> 48 #include <sys/fcntl.h> 49 #include <sys/file.h> 50 #include <sys/filio.h> 51 #include <sys/jail.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/protosw.h> 55 #include <sys/sf_buf.h> 56 #include <sys/sysent.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/signalvar.h> 60 #include <sys/syscall.h> 61 #include <sys/syscallsubr.h> 62 #include <sys/sysctl.h> 63 #include <sys/uio.h> 64 #include <sys/vnode.h> 65 #ifdef KTRACE 66 #include <sys/ktrace.h> 67 #endif 68 #ifdef COMPAT_FREEBSD32 69 #include <compat/freebsd32/freebsd32.h> 70 #include <compat/freebsd32/freebsd32_syscall.h> 71 #include <compat/freebsd32/freebsd32_util.h> 72 #endif 73 74 #include <net/vnet.h> 75 76 #include <security/audit/audit.h> 77 #include <security/mac/mac_framework.h> 78 79 #include <netinet/sctp.h> 80 #include <netinet/sctp_pcb.h> 81 #include <netinet/sctp_var.h> 82 #ifdef INET6 83 #include <netinet6/sctp6_var.h> 84 #endif 85 #include <netinet/sctp_os_bsd.h> 86 #include <netinet/sctp_peeloff.h> 87 88 static struct syscall_helper_data sctp_syscalls[] = { 89 SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED), 90 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED), 91 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED), 92 SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED), 93 SYSCALL_INIT_LAST 94 }; 95 96 #ifdef COMPAT_FREEBSD32 97 static struct syscall_helper_data sctp32_syscalls[] = { 98 SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff), 99 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg), 100 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov), 101 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg), 102 SYSCALL_INIT_LAST 103 }; 104 #endif 105 106 int 107 sctp_syscalls_init(void) 108 { 109 int error; 110 111 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD); 112 if (error != 0) 113 return (error); 114 #ifdef COMPAT_FREEBSD32 115 error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD); 116 if (error != 0) 117 return (error); 118 #endif 119 return (0); 120 } 121 122 #ifdef SCTP 123 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL); 124 #endif 125 126 int 127 sctp_syscalls_uninit(void) 128 { 129 int error; 130 131 #ifdef COMPAT_FREEBSD32 132 error = syscall32_helper_unregister(sctp32_syscalls); 133 if (error != 0) 134 return (error); 135 #endif 136 error = syscall_helper_unregister(sctp_syscalls); 137 if (error != 0) 138 return (error); 139 return (0); 140 } 141 142 /* 143 * SCTP syscalls. 144 */ 145 int 146 sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap) 147 { 148 struct file *headfp, *nfp = NULL; 149 struct socket *head, *so; 150 struct filecaps fcaps; 151 cap_rights_t rights; 152 u_int fflag; 153 int error, fd; 154 155 AUDIT_ARG_FD(uap->sd); 156 error = getsock_cap(td, uap->sd, 157 cap_rights_init_one(&rights, CAP_PEELOFF), &headfp, &fcaps); 158 if (error != 0) 159 goto done2; 160 fflag = atomic_load_int(&headfp->f_flag); 161 head = headfp->f_data; 162 if (head->so_proto->pr_protocol != IPPROTO_SCTP) { 163 error = EOPNOTSUPP; 164 goto done; 165 } 166 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name); 167 if (error != 0) 168 goto done; 169 /* 170 * At this point we know we do have a assoc to pull 171 * we proceed to get the fd setup. This may block 172 * but that is ok. 173 */ 174 175 error = falloc_caps(td, &nfp, &fd, 0, &fcaps); 176 if (error != 0) 177 goto done; 178 td->td_retval[0] = fd; 179 180 CURVNET_SET(head->so_vnet); 181 switch (head->so_proto->pr_domain->dom_family) { 182 #ifdef INET 183 case AF_INET: 184 so = sopeeloff(head, &sctp_stream_protosw); 185 break; 186 #endif 187 #ifdef INET6 188 case AF_INET6: 189 so = sopeeloff(head, &sctp6_stream_protosw); 190 break; 191 #endif 192 default: 193 error = EOPNOTSUPP; 194 goto noconnection; 195 } 196 if (so == NULL) { 197 error = ENOMEM; 198 goto noconnection; 199 } 200 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 201 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 202 if (error != 0) 203 goto noconnection; 204 if (head->so_sigio != NULL) 205 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 206 207 noconnection: 208 /* 209 * close the new descriptor, assuming someone hasn't ripped it 210 * out from under us. 211 */ 212 if (error != 0) 213 fdclose(td, nfp, fd); 214 215 /* 216 * Release explicitly held references before returning. 217 */ 218 CURVNET_RESTORE(); 219 done: 220 if (nfp != NULL) 221 fdrop(nfp, td); 222 fdrop(headfp, td); 223 done2: 224 return (error); 225 } 226 227 int 228 sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap) 229 { 230 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 231 struct socket *so; 232 struct file *fp = NULL; 233 struct sockaddr *to = NULL; 234 #ifdef KTRACE 235 struct uio *ktruio = NULL; 236 #endif 237 struct uio auio; 238 struct iovec iov[1]; 239 cap_rights_t rights; 240 int error = 0, len; 241 242 if (uap->sinfo != NULL) { 243 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 244 if (error != 0) 245 return (error); 246 u_sinfo = &sinfo; 247 } 248 249 cap_rights_init_one(&rights, CAP_SEND); 250 if (uap->tolen != 0) { 251 error = getsockaddr(&to, uap->to, uap->tolen); 252 if (error != 0) { 253 to = NULL; 254 goto sctp_bad2; 255 } 256 cap_rights_set_one(&rights, CAP_CONNECT); 257 } 258 259 AUDIT_ARG_FD(uap->sd); 260 error = getsock(td, uap->sd, &rights, &fp); 261 if (error != 0) 262 goto sctp_bad; 263 #ifdef KTRACE 264 if (to && (KTRPOINT(td, KTR_STRUCT))) 265 ktrsockaddr(to); 266 #endif 267 268 iov[0].iov_base = uap->msg; 269 iov[0].iov_len = uap->mlen; 270 271 so = (struct socket *)fp->f_data; 272 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 273 error = EOPNOTSUPP; 274 goto sctp_bad; 275 } 276 #ifdef MAC 277 error = mac_socket_check_send(td->td_ucred, so); 278 if (error != 0) 279 goto sctp_bad; 280 #endif /* MAC */ 281 282 auio.uio_iov = iov; 283 auio.uio_iovcnt = 1; 284 auio.uio_segflg = UIO_USERSPACE; 285 auio.uio_rw = UIO_WRITE; 286 auio.uio_td = td; 287 auio.uio_offset = 0; /* XXX */ 288 auio.uio_resid = 0; 289 #ifdef KTRACE 290 if (KTRPOINT(td, KTR_GENIO)) 291 ktruio = cloneuio(&auio); 292 #endif /* KTRACE */ 293 len = auio.uio_resid = uap->mlen; 294 CURVNET_SET(so->so_vnet); 295 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 296 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 297 CURVNET_RESTORE(); 298 if (error != 0) { 299 if (auio.uio_resid != len && (error == ERESTART || 300 error == EINTR || error == EWOULDBLOCK)) 301 error = 0; 302 /* Generation of SIGPIPE can be controlled per socket. */ 303 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 304 !(uap->flags & MSG_NOSIGNAL)) { 305 PROC_LOCK(td->td_proc); 306 tdsignal(td, SIGPIPE); 307 PROC_UNLOCK(td->td_proc); 308 } 309 } 310 if (error == 0) 311 td->td_retval[0] = len - auio.uio_resid; 312 #ifdef KTRACE 313 if (ktruio != NULL) { 314 if (error == 0) 315 ktruio->uio_resid = td->td_retval[0]; 316 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 317 } 318 #endif /* KTRACE */ 319 sctp_bad: 320 if (fp != NULL) 321 fdrop(fp, td); 322 sctp_bad2: 323 free(to, M_SONAME); 324 return (error); 325 } 326 327 int 328 sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap) 329 { 330 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 331 struct socket *so; 332 struct file *fp = NULL; 333 struct sockaddr *to = NULL; 334 #ifdef KTRACE 335 struct uio *ktruio = NULL; 336 #endif 337 struct uio auio; 338 struct iovec *iov, *tiov; 339 cap_rights_t rights; 340 ssize_t len; 341 int error, i; 342 343 if (uap->sinfo != NULL) { 344 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 345 if (error != 0) 346 return (error); 347 u_sinfo = &sinfo; 348 } 349 cap_rights_init_one(&rights, CAP_SEND); 350 if (uap->tolen != 0) { 351 error = getsockaddr(&to, uap->to, uap->tolen); 352 if (error != 0) { 353 to = NULL; 354 goto sctp_bad2; 355 } 356 cap_rights_set_one(&rights, CAP_CONNECT); 357 } 358 359 AUDIT_ARG_FD(uap->sd); 360 error = getsock(td, uap->sd, &rights, &fp); 361 if (error != 0) 362 goto sctp_bad1; 363 364 #ifdef COMPAT_FREEBSD32 365 if (SV_CURPROC_FLAG(SV_ILP32)) 366 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 367 uap->iovlen, &iov, EMSGSIZE); 368 else 369 #endif 370 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 371 if (error != 0) 372 goto sctp_bad1; 373 #ifdef KTRACE 374 if (to && (KTRPOINT(td, KTR_STRUCT))) 375 ktrsockaddr(to); 376 #endif 377 378 so = (struct socket *)fp->f_data; 379 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 380 error = EOPNOTSUPP; 381 goto sctp_bad; 382 } 383 #ifdef MAC 384 error = mac_socket_check_send(td->td_ucred, so); 385 if (error != 0) 386 goto sctp_bad; 387 #endif /* MAC */ 388 389 auio.uio_iov = iov; 390 auio.uio_iovcnt = uap->iovlen; 391 auio.uio_segflg = UIO_USERSPACE; 392 auio.uio_rw = UIO_WRITE; 393 auio.uio_td = td; 394 auio.uio_offset = 0; /* XXX */ 395 auio.uio_resid = 0; 396 tiov = iov; 397 for (i = 0; i <uap->iovlen; i++, tiov++) { 398 if ((auio.uio_resid += tiov->iov_len) < 0) { 399 error = EINVAL; 400 goto sctp_bad; 401 } 402 } 403 #ifdef KTRACE 404 if (KTRPOINT(td, KTR_GENIO)) 405 ktruio = cloneuio(&auio); 406 #endif /* KTRACE */ 407 len = auio.uio_resid; 408 CURVNET_SET(so->so_vnet); 409 error = sctp_lower_sosend(so, to, &auio, 410 (struct mbuf *)NULL, (struct mbuf *)NULL, 411 uap->flags, u_sinfo, td); 412 CURVNET_RESTORE(); 413 if (error != 0) { 414 if (auio.uio_resid != len && (error == ERESTART || 415 error == EINTR || error == EWOULDBLOCK)) 416 error = 0; 417 /* Generation of SIGPIPE can be controlled per socket */ 418 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 419 !(uap->flags & MSG_NOSIGNAL)) { 420 PROC_LOCK(td->td_proc); 421 tdsignal(td, SIGPIPE); 422 PROC_UNLOCK(td->td_proc); 423 } 424 } 425 if (error == 0) 426 td->td_retval[0] = len - auio.uio_resid; 427 #ifdef KTRACE 428 if (ktruio != NULL) { 429 if (error == 0) 430 ktruio->uio_resid = td->td_retval[0]; 431 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 432 } 433 #endif /* KTRACE */ 434 sctp_bad: 435 free(iov, M_IOV); 436 sctp_bad1: 437 if (fp != NULL) 438 fdrop(fp, td); 439 sctp_bad2: 440 free(to, M_SONAME); 441 return (error); 442 } 443 444 int 445 sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap) 446 { 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(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV), 463 &fp); 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 } 577