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