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 #include "opt_capsicum.h" 33 #include "opt_sctp.h" 34 #include "opt_ktrace.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/capsicum.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/sysproto.h> 43 #include <sys/malloc.h> 44 #include <sys/filedesc.h> 45 #include <sys/event.h> 46 #include <sys/proc.h> 47 #include <sys/fcntl.h> 48 #include <sys/file.h> 49 #include <sys/filio.h> 50 #include <sys/jail.h> 51 #include <sys/mount.h> 52 #include <sys/mbuf.h> 53 #include <sys/protosw.h> 54 #include <sys/sf_buf.h> 55 #include <sys/sysent.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/signalvar.h> 59 #include <sys/syscall.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/uio.h> 63 #include <sys/vnode.h> 64 #ifdef KTRACE 65 #include <sys/ktrace.h> 66 #endif 67 #ifdef COMPAT_FREEBSD32 68 #include <compat/freebsd32/freebsd32.h> 69 #include <compat/freebsd32/freebsd32_syscall.h> 70 #include <compat/freebsd32/freebsd32_util.h> 71 #endif 72 73 #include <net/vnet.h> 74 75 #include <security/audit/audit.h> 76 #include <security/mac/mac_framework.h> 77 78 #include <netinet/sctp.h> 79 #include <netinet/sctp_os_bsd.h> 80 #include <netinet/sctp_peeloff.h> 81 82 static struct syscall_helper_data sctp_syscalls[] = { 83 SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED), 84 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED), 85 SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED), 86 SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED), 87 SYSCALL_INIT_LAST 88 }; 89 90 #ifdef COMPAT_FREEBSD32 91 static struct syscall_helper_data sctp32_syscalls[] = { 92 SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff), 93 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg), 94 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov), 95 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg), 96 SYSCALL_INIT_LAST 97 }; 98 #endif 99 100 int 101 sctp_syscalls_init(void) 102 { 103 int error; 104 105 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD); 106 if (error != 0) 107 return (error); 108 #ifdef COMPAT_FREEBSD32 109 error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD); 110 if (error != 0) 111 return (error); 112 #endif 113 return (0); 114 } 115 116 #ifdef SCTP 117 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL); 118 #endif 119 120 int 121 sctp_syscalls_uninit(void) 122 { 123 int error; 124 125 #ifdef COMPAT_FREEBSD32 126 error = syscall32_helper_unregister(sctp32_syscalls); 127 if (error != 0) 128 return (error); 129 #endif 130 error = syscall_helper_unregister(sctp_syscalls); 131 if (error != 0) 132 return (error); 133 return (0); 134 } 135 136 /* 137 * SCTP syscalls. 138 */ 139 int 140 sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap) 141 { 142 struct file *headfp, *nfp = NULL; 143 struct socket *head, *so; 144 struct filecaps fcaps; 145 cap_rights_t rights; 146 u_int fflag; 147 int error, fd; 148 149 AUDIT_ARG_FD(uap->sd); 150 error = getsock_cap(td, uap->sd, 151 cap_rights_init_one(&rights, CAP_PEELOFF), &headfp, &fcaps); 152 if (error != 0) 153 goto done2; 154 fflag = atomic_load_int(&headfp->f_flag); 155 head = headfp->f_data; 156 if (head->so_proto->pr_protocol != IPPROTO_SCTP) { 157 error = EOPNOTSUPP; 158 goto done; 159 } 160 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name); 161 if (error != 0) 162 goto done; 163 /* 164 * At this point we know we do have a assoc to pull 165 * we proceed to get the fd setup. This may block 166 * but that is ok. 167 */ 168 169 error = falloc_caps(td, &nfp, &fd, 0, &fcaps); 170 if (error != 0) 171 goto done; 172 td->td_retval[0] = fd; 173 174 CURVNET_SET(head->so_vnet); 175 so = sopeeloff(head); 176 if (so == NULL) { 177 error = ENOMEM; 178 goto noconnection; 179 } 180 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 181 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 182 if (error != 0) 183 goto noconnection; 184 if (head->so_sigio != NULL) 185 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 186 187 noconnection: 188 /* 189 * close the new descriptor, assuming someone hasn't ripped it 190 * out from under us. 191 */ 192 if (error != 0) 193 fdclose(td, nfp, fd); 194 195 /* 196 * Release explicitly held references before returning. 197 */ 198 CURVNET_RESTORE(); 199 done: 200 if (nfp != NULL) 201 fdrop(nfp, td); 202 fdrop(headfp, td); 203 done2: 204 return (error); 205 } 206 207 int 208 sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap) 209 { 210 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 211 struct socket *so; 212 struct file *fp = NULL; 213 struct sockaddr *to = NULL; 214 #ifdef KTRACE 215 struct uio *ktruio = NULL; 216 #endif 217 struct uio auio; 218 struct iovec iov[1]; 219 cap_rights_t rights; 220 int error = 0, len; 221 222 if (uap->sinfo != NULL) { 223 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 224 if (error != 0) 225 return (error); 226 u_sinfo = &sinfo; 227 } 228 229 cap_rights_init_one(&rights, CAP_SEND); 230 if (uap->tolen != 0) { 231 error = getsockaddr(&to, uap->to, uap->tolen); 232 if (error != 0) { 233 to = NULL; 234 goto sctp_bad2; 235 } 236 cap_rights_set_one(&rights, CAP_CONNECT); 237 } 238 239 AUDIT_ARG_FD(uap->sd); 240 error = getsock(td, uap->sd, &rights, &fp); 241 if (error != 0) 242 goto sctp_bad; 243 #ifdef KTRACE 244 if (to && (KTRPOINT(td, KTR_STRUCT))) 245 ktrsockaddr(to); 246 #endif 247 248 iov[0].iov_base = uap->msg; 249 iov[0].iov_len = uap->mlen; 250 251 so = (struct socket *)fp->f_data; 252 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 253 error = EOPNOTSUPP; 254 goto sctp_bad; 255 } 256 #ifdef MAC 257 error = mac_socket_check_send(td->td_ucred, so); 258 if (error != 0) 259 goto sctp_bad; 260 #endif /* MAC */ 261 262 auio.uio_iov = iov; 263 auio.uio_iovcnt = 1; 264 auio.uio_segflg = UIO_USERSPACE; 265 auio.uio_rw = UIO_WRITE; 266 auio.uio_td = td; 267 auio.uio_offset = 0; /* XXX */ 268 auio.uio_resid = 0; 269 #ifdef KTRACE 270 if (KTRPOINT(td, KTR_GENIO)) 271 ktruio = cloneuio(&auio); 272 #endif /* KTRACE */ 273 len = auio.uio_resid = uap->mlen; 274 CURVNET_SET(so->so_vnet); 275 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 276 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 277 CURVNET_RESTORE(); 278 if (error != 0) { 279 if (auio.uio_resid != len && (error == ERESTART || 280 error == EINTR || error == EWOULDBLOCK)) 281 error = 0; 282 /* Generation of SIGPIPE can be controlled per socket. */ 283 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 284 !(uap->flags & MSG_NOSIGNAL)) { 285 PROC_LOCK(td->td_proc); 286 tdsignal(td, SIGPIPE); 287 PROC_UNLOCK(td->td_proc); 288 } 289 } 290 if (error == 0) 291 td->td_retval[0] = len - auio.uio_resid; 292 #ifdef KTRACE 293 if (ktruio != NULL) { 294 if (error == 0) 295 ktruio->uio_resid = td->td_retval[0]; 296 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 297 } 298 #endif /* KTRACE */ 299 sctp_bad: 300 if (fp != NULL) 301 fdrop(fp, td); 302 sctp_bad2: 303 free(to, M_SONAME); 304 return (error); 305 } 306 307 int 308 sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap) 309 { 310 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 311 struct socket *so; 312 struct file *fp = NULL; 313 struct sockaddr *to = NULL; 314 #ifdef KTRACE 315 struct uio *ktruio = NULL; 316 #endif 317 struct uio auio; 318 struct iovec *iov, *tiov; 319 cap_rights_t rights; 320 ssize_t len; 321 int error, i; 322 323 if (uap->sinfo != NULL) { 324 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 325 if (error != 0) 326 return (error); 327 u_sinfo = &sinfo; 328 } 329 cap_rights_init_one(&rights, CAP_SEND); 330 if (uap->tolen != 0) { 331 error = getsockaddr(&to, uap->to, uap->tolen); 332 if (error != 0) { 333 to = NULL; 334 goto sctp_bad2; 335 } 336 cap_rights_set_one(&rights, CAP_CONNECT); 337 } 338 339 AUDIT_ARG_FD(uap->sd); 340 error = getsock(td, uap->sd, &rights, &fp); 341 if (error != 0) 342 goto sctp_bad1; 343 344 #ifdef COMPAT_FREEBSD32 345 if (SV_CURPROC_FLAG(SV_ILP32)) 346 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 347 uap->iovlen, &iov, EMSGSIZE); 348 else 349 #endif 350 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 351 if (error != 0) 352 goto sctp_bad1; 353 #ifdef KTRACE 354 if (to && (KTRPOINT(td, KTR_STRUCT))) 355 ktrsockaddr(to); 356 #endif 357 358 so = (struct socket *)fp->f_data; 359 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 360 error = EOPNOTSUPP; 361 goto sctp_bad; 362 } 363 #ifdef MAC 364 error = mac_socket_check_send(td->td_ucred, so); 365 if (error != 0) 366 goto sctp_bad; 367 #endif /* MAC */ 368 369 auio.uio_iov = iov; 370 auio.uio_iovcnt = uap->iovlen; 371 auio.uio_segflg = UIO_USERSPACE; 372 auio.uio_rw = UIO_WRITE; 373 auio.uio_td = td; 374 auio.uio_offset = 0; /* XXX */ 375 auio.uio_resid = 0; 376 tiov = iov; 377 for (i = 0; i <uap->iovlen; i++, tiov++) { 378 if ((auio.uio_resid += tiov->iov_len) < 0) { 379 error = EINVAL; 380 goto sctp_bad; 381 } 382 } 383 #ifdef KTRACE 384 if (KTRPOINT(td, KTR_GENIO)) 385 ktruio = cloneuio(&auio); 386 #endif /* KTRACE */ 387 len = auio.uio_resid; 388 CURVNET_SET(so->so_vnet); 389 error = sctp_lower_sosend(so, to, &auio, 390 (struct mbuf *)NULL, (struct mbuf *)NULL, 391 uap->flags, u_sinfo, td); 392 CURVNET_RESTORE(); 393 if (error != 0) { 394 if (auio.uio_resid != len && (error == ERESTART || 395 error == EINTR || error == EWOULDBLOCK)) 396 error = 0; 397 /* Generation of SIGPIPE can be controlled per socket */ 398 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 399 !(uap->flags & MSG_NOSIGNAL)) { 400 PROC_LOCK(td->td_proc); 401 tdsignal(td, SIGPIPE); 402 PROC_UNLOCK(td->td_proc); 403 } 404 } 405 if (error == 0) 406 td->td_retval[0] = len - auio.uio_resid; 407 #ifdef KTRACE 408 if (ktruio != NULL) { 409 if (error == 0) 410 ktruio->uio_resid = td->td_retval[0]; 411 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 412 } 413 #endif /* KTRACE */ 414 sctp_bad: 415 free(iov, M_IOV); 416 sctp_bad1: 417 if (fp != NULL) 418 fdrop(fp, td); 419 sctp_bad2: 420 free(to, M_SONAME); 421 return (error); 422 } 423 424 int 425 sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap) 426 { 427 uint8_t sockbufstore[256]; 428 struct uio auio; 429 struct iovec *iov, *tiov; 430 struct sctp_sndrcvinfo sinfo; 431 struct socket *so; 432 struct file *fp = NULL; 433 struct sockaddr *fromsa; 434 cap_rights_t rights; 435 #ifdef KTRACE 436 struct uio *ktruio = NULL; 437 #endif 438 ssize_t len; 439 int error, fromlen, i, msg_flags; 440 441 AUDIT_ARG_FD(uap->sd); 442 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV), 443 &fp); 444 if (error != 0) 445 return (error); 446 #ifdef COMPAT_FREEBSD32 447 if (SV_CURPROC_FLAG(SV_ILP32)) 448 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 449 uap->iovlen, &iov, EMSGSIZE); 450 else 451 #endif 452 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 453 if (error != 0) 454 goto out1; 455 456 so = fp->f_data; 457 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 458 error = EOPNOTSUPP; 459 goto out; 460 } 461 #ifdef MAC 462 error = mac_socket_check_receive(td->td_ucred, so); 463 if (error != 0) 464 goto out; 465 #endif /* MAC */ 466 467 if (uap->fromlenaddr != NULL) { 468 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen)); 469 if (error != 0) 470 goto out; 471 } else { 472 fromlen = 0; 473 } 474 if (uap->msg_flags) { 475 error = copyin(uap->msg_flags, &msg_flags, sizeof (int)); 476 if (error != 0) 477 goto out; 478 } else { 479 msg_flags = 0; 480 } 481 auio.uio_iov = iov; 482 auio.uio_iovcnt = uap->iovlen; 483 auio.uio_segflg = UIO_USERSPACE; 484 auio.uio_rw = UIO_READ; 485 auio.uio_td = td; 486 auio.uio_offset = 0; /* XXX */ 487 auio.uio_resid = 0; 488 tiov = iov; 489 for (i = 0; i <uap->iovlen; i++, tiov++) { 490 if ((auio.uio_resid += tiov->iov_len) < 0) { 491 error = EINVAL; 492 goto out; 493 } 494 } 495 len = auio.uio_resid; 496 fromsa = (struct sockaddr *)sockbufstore; 497 498 #ifdef KTRACE 499 if (KTRPOINT(td, KTR_GENIO)) 500 ktruio = cloneuio(&auio); 501 #endif /* KTRACE */ 502 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo)); 503 CURVNET_SET(so->so_vnet); 504 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL, 505 fromsa, fromlen, &msg_flags, 506 (struct sctp_sndrcvinfo *)&sinfo, 1); 507 CURVNET_RESTORE(); 508 if (error != 0) { 509 if (auio.uio_resid != len && (error == ERESTART || 510 error == EINTR || error == EWOULDBLOCK)) 511 error = 0; 512 } else { 513 if (uap->sinfo) 514 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo)); 515 } 516 #ifdef KTRACE 517 if (ktruio != NULL) { 518 ktruio->uio_resid = len - auio.uio_resid; 519 ktrgenio(uap->sd, UIO_READ, ktruio, error); 520 } 521 #endif /* KTRACE */ 522 if (error != 0) 523 goto out; 524 td->td_retval[0] = len - auio.uio_resid; 525 526 if (fromlen && uap->from) { 527 len = fromlen; 528 if (len <= 0 || fromsa == NULL) 529 len = 0; 530 else { 531 len = MIN(len, fromsa->sa_len); 532 error = copyout(fromsa, uap->from, (size_t)len); 533 if (error != 0) 534 goto out; 535 } 536 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t)); 537 if (error != 0) 538 goto out; 539 } 540 #ifdef KTRACE 541 if (KTRPOINT(td, KTR_STRUCT)) 542 ktrsockaddr(fromsa); 543 #endif 544 if (uap->msg_flags) { 545 error = copyout(&msg_flags, uap->msg_flags, sizeof (int)); 546 if (error != 0) 547 goto out; 548 } 549 out: 550 free(iov, M_IOV); 551 out1: 552 if (fp != NULL) 553 fdrop(fp, td); 554 555 return (error); 556 } 557