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 if (error == 0) 294 ktruio->uio_resid = td->td_retval[0]; 295 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 296 } 297 #endif /* KTRACE */ 298 sctp_bad: 299 if (fp != NULL) 300 fdrop(fp, td); 301 sctp_bad2: 302 free(to, M_SONAME); 303 return (error); 304 } 305 306 int 307 sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap) 308 { 309 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 310 struct socket *so; 311 struct file *fp = NULL; 312 struct sockaddr *to = NULL; 313 #ifdef KTRACE 314 struct uio *ktruio = NULL; 315 #endif 316 struct uio auio; 317 struct iovec *iov, *tiov; 318 cap_rights_t rights; 319 ssize_t len; 320 int error, i; 321 322 if (uap->sinfo != NULL) { 323 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 324 if (error != 0) 325 return (error); 326 u_sinfo = &sinfo; 327 } 328 cap_rights_init_one(&rights, CAP_SEND); 329 if (uap->tolen != 0) { 330 error = getsockaddr(&to, uap->to, uap->tolen); 331 if (error != 0) { 332 to = NULL; 333 goto sctp_bad2; 334 } 335 cap_rights_set_one(&rights, CAP_CONNECT); 336 } 337 338 AUDIT_ARG_FD(uap->sd); 339 error = getsock(td, uap->sd, &rights, &fp); 340 if (error != 0) 341 goto sctp_bad1; 342 343 #ifdef COMPAT_FREEBSD32 344 if (SV_CURPROC_FLAG(SV_ILP32)) 345 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 346 uap->iovlen, &iov, EMSGSIZE); 347 else 348 #endif 349 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 350 if (error != 0) 351 goto sctp_bad1; 352 #ifdef KTRACE 353 if (to && (KTRPOINT(td, KTR_STRUCT))) 354 ktrsockaddr(to); 355 #endif 356 357 so = (struct socket *)fp->f_data; 358 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 359 error = EOPNOTSUPP; 360 goto sctp_bad; 361 } 362 #ifdef MAC 363 error = mac_socket_check_send(td->td_ucred, so); 364 if (error != 0) 365 goto sctp_bad; 366 #endif /* MAC */ 367 368 auio.uio_iov = iov; 369 auio.uio_iovcnt = uap->iovlen; 370 auio.uio_segflg = UIO_USERSPACE; 371 auio.uio_rw = UIO_WRITE; 372 auio.uio_td = td; 373 auio.uio_offset = 0; /* XXX */ 374 auio.uio_resid = 0; 375 tiov = iov; 376 for (i = 0; i <uap->iovlen; i++, tiov++) { 377 if ((auio.uio_resid += tiov->iov_len) < 0) { 378 error = EINVAL; 379 goto sctp_bad; 380 } 381 } 382 #ifdef KTRACE 383 if (KTRPOINT(td, KTR_GENIO)) 384 ktruio = cloneuio(&auio); 385 #endif /* KTRACE */ 386 len = auio.uio_resid; 387 CURVNET_SET(so->so_vnet); 388 error = sctp_lower_sosend(so, to, &auio, 389 (struct mbuf *)NULL, (struct mbuf *)NULL, 390 uap->flags, u_sinfo, td); 391 CURVNET_RESTORE(); 392 if (error != 0) { 393 if (auio.uio_resid != len && (error == ERESTART || 394 error == EINTR || error == EWOULDBLOCK)) 395 error = 0; 396 /* Generation of SIGPIPE can be controlled per socket */ 397 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 398 !(uap->flags & MSG_NOSIGNAL)) { 399 PROC_LOCK(td->td_proc); 400 tdsignal(td, SIGPIPE); 401 PROC_UNLOCK(td->td_proc); 402 } 403 } 404 if (error == 0) 405 td->td_retval[0] = len - auio.uio_resid; 406 #ifdef KTRACE 407 if (ktruio != NULL) { 408 if (error == 0) 409 ktruio->uio_resid = td->td_retval[0]; 410 ktrgenio(uap->sd, UIO_WRITE, ktruio, error); 411 } 412 #endif /* KTRACE */ 413 sctp_bad: 414 free(iov, M_IOV); 415 sctp_bad1: 416 if (fp != NULL) 417 fdrop(fp, td); 418 sctp_bad2: 419 free(to, M_SONAME); 420 return (error); 421 } 422 423 int 424 sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap) 425 { 426 uint8_t sockbufstore[256]; 427 struct uio auio; 428 struct iovec *iov, *tiov; 429 struct sctp_sndrcvinfo sinfo; 430 struct socket *so; 431 struct file *fp = NULL; 432 struct sockaddr *fromsa; 433 cap_rights_t rights; 434 #ifdef KTRACE 435 struct uio *ktruio = NULL; 436 #endif 437 ssize_t len; 438 int error, fromlen, i, msg_flags; 439 440 AUDIT_ARG_FD(uap->sd); 441 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV), 442 &fp); 443 if (error != 0) 444 return (error); 445 #ifdef COMPAT_FREEBSD32 446 if (SV_CURPROC_FLAG(SV_ILP32)) 447 error = freebsd32_copyiniov((struct iovec32 *)uap->iov, 448 uap->iovlen, &iov, EMSGSIZE); 449 else 450 #endif 451 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE); 452 if (error != 0) 453 goto out1; 454 455 so = fp->f_data; 456 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 457 error = EOPNOTSUPP; 458 goto out; 459 } 460 #ifdef MAC 461 error = mac_socket_check_receive(td->td_ucred, so); 462 if (error != 0) 463 goto out; 464 #endif /* MAC */ 465 466 if (uap->fromlenaddr != NULL) { 467 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen)); 468 if (error != 0) 469 goto out; 470 } else { 471 fromlen = 0; 472 } 473 if (uap->msg_flags) { 474 error = copyin(uap->msg_flags, &msg_flags, sizeof (int)); 475 if (error != 0) 476 goto out; 477 } else { 478 msg_flags = 0; 479 } 480 auio.uio_iov = iov; 481 auio.uio_iovcnt = uap->iovlen; 482 auio.uio_segflg = UIO_USERSPACE; 483 auio.uio_rw = UIO_READ; 484 auio.uio_td = td; 485 auio.uio_offset = 0; /* XXX */ 486 auio.uio_resid = 0; 487 tiov = iov; 488 for (i = 0; i <uap->iovlen; i++, tiov++) { 489 if ((auio.uio_resid += tiov->iov_len) < 0) { 490 error = EINVAL; 491 goto out; 492 } 493 } 494 len = auio.uio_resid; 495 fromsa = (struct sockaddr *)sockbufstore; 496 497 #ifdef KTRACE 498 if (KTRPOINT(td, KTR_GENIO)) 499 ktruio = cloneuio(&auio); 500 #endif /* KTRACE */ 501 memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo)); 502 CURVNET_SET(so->so_vnet); 503 error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL, 504 fromsa, fromlen, &msg_flags, 505 (struct sctp_sndrcvinfo *)&sinfo, 1); 506 CURVNET_RESTORE(); 507 if (error != 0) { 508 if (auio.uio_resid != len && (error == ERESTART || 509 error == EINTR || error == EWOULDBLOCK)) 510 error = 0; 511 } else { 512 if (uap->sinfo) 513 error = copyout(&sinfo, uap->sinfo, sizeof (sinfo)); 514 } 515 #ifdef KTRACE 516 if (ktruio != NULL) { 517 ktruio->uio_resid = len - auio.uio_resid; 518 ktrgenio(uap->sd, UIO_READ, ktruio, error); 519 } 520 #endif /* KTRACE */ 521 if (error != 0) 522 goto out; 523 td->td_retval[0] = len - auio.uio_resid; 524 525 if (fromlen && uap->from) { 526 len = fromlen; 527 if (len <= 0 || fromsa == NULL) 528 len = 0; 529 else { 530 len = MIN(len, fromsa->sa_len); 531 error = copyout(fromsa, uap->from, (size_t)len); 532 if (error != 0) 533 goto out; 534 } 535 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t)); 536 if (error != 0) 537 goto out; 538 } 539 #ifdef KTRACE 540 if (KTRPOINT(td, KTR_STRUCT)) 541 ktrsockaddr(fromsa); 542 #endif 543 if (uap->msg_flags) { 544 error = copyout(&msg_flags, uap->msg_flags, sizeof (int)); 545 if (error != 0) 546 goto out; 547 } 548 out: 549 free(iov, M_IOV); 550 out1: 551 if (fp != NULL) 552 fdrop(fp, td); 553 554 return (error); 555 } 556