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 __FBSDID("$FreeBSD$"); 33 34 #include "opt_capsicum.h" 35 #include "opt_sctp.h" 36 #include "opt_ktrace.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/capsicum.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/sysproto.h> 45 #include <sys/malloc.h> 46 #include <sys/filedesc.h> 47 #include <sys/event.h> 48 #include <sys/proc.h> 49 #include <sys/fcntl.h> 50 #include <sys/file.h> 51 #include <sys/filio.h> 52 #include <sys/jail.h> 53 #include <sys/mount.h> 54 #include <sys/mbuf.h> 55 #include <sys/protosw.h> 56 #include <sys/sf_buf.h> 57 #include <sys/sysent.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/signalvar.h> 61 #include <sys/syscall.h> 62 #include <sys/syscallsubr.h> 63 #include <sys/sysctl.h> 64 #include <sys/uio.h> 65 #include <sys/vnode.h> 66 #ifdef KTRACE 67 #include <sys/ktrace.h> 68 #endif 69 #ifdef COMPAT_FREEBSD32 70 #include <compat/freebsd32/freebsd32.h> 71 #include <compat/freebsd32/freebsd32_syscall.h> 72 #include <compat/freebsd32/freebsd32_util.h> 73 #endif 74 75 #include <net/vnet.h> 76 77 #include <security/audit/audit.h> 78 #include <security/mac/mac_framework.h> 79 80 #include <netinet/sctp.h> 81 #include <netinet/sctp_os_bsd.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 #ifdef COMPAT_FREEBSD32 93 static struct syscall_helper_data sctp32_syscalls[] = { 94 SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff), 95 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg), 96 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov), 97 SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg), 98 SYSCALL_INIT_LAST 99 }; 100 #endif 101 102 int 103 sctp_syscalls_init(void) 104 { 105 int error; 106 107 error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD); 108 if (error != 0) 109 return (error); 110 #ifdef COMPAT_FREEBSD32 111 error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD); 112 if (error != 0) 113 return (error); 114 #endif 115 return (0); 116 } 117 118 #ifdef SCTP 119 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL); 120 #endif 121 122 int 123 sctp_syscalls_uninit(void) 124 { 125 int error; 126 127 #ifdef COMPAT_FREEBSD32 128 error = syscall32_helper_unregister(sctp32_syscalls); 129 if (error != 0) 130 return (error); 131 #endif 132 error = syscall_helper_unregister(sctp_syscalls); 133 if (error != 0) 134 return (error); 135 return (0); 136 } 137 138 /* 139 * SCTP syscalls. 140 */ 141 int 142 sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap) 143 { 144 struct file *headfp, *nfp = NULL; 145 struct socket *head, *so; 146 cap_rights_t rights; 147 u_int fflag; 148 int error, fd; 149 150 AUDIT_ARG_FD(uap->sd); 151 error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_PEELOFF), 152 &headfp); 153 if (error != 0) 154 goto done2; 155 fflag = atomic_load_int(&headfp->f_flag); 156 head = headfp->f_data; 157 if (head->so_proto->pr_protocol != IPPROTO_SCTP) { 158 error = EOPNOTSUPP; 159 goto done; 160 } 161 error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name); 162 if (error != 0) 163 goto done; 164 /* 165 * At this point we know we do have a assoc to pull 166 * we proceed to get the fd setup. This may block 167 * but that is ok. 168 */ 169 170 error = falloc(td, &nfp, &fd, 0); 171 if (error != 0) 172 goto done; 173 td->td_retval[0] = fd; 174 175 CURVNET_SET(head->so_vnet); 176 so = sopeeloff(head); 177 if (so == NULL) { 178 error = ENOMEM; 179 goto noconnection; 180 } 181 finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); 182 error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name); 183 if (error != 0) 184 goto noconnection; 185 if (head->so_sigio != NULL) 186 fsetown(fgetown(&head->so_sigio), &so->so_sigio); 187 188 noconnection: 189 /* 190 * close the new descriptor, assuming someone hasn't ripped it 191 * out from under us. 192 */ 193 if (error != 0) 194 fdclose(td, nfp, fd); 195 196 /* 197 * Release explicitly held references before returning. 198 */ 199 CURVNET_RESTORE(); 200 done: 201 if (nfp != NULL) 202 fdrop(nfp, td); 203 fdrop(headfp, td); 204 done2: 205 return (error); 206 } 207 208 int 209 sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap) 210 { 211 struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL; 212 struct socket *so; 213 struct file *fp = NULL; 214 struct sockaddr *to = NULL; 215 #ifdef KTRACE 216 struct uio *ktruio = NULL; 217 #endif 218 struct uio auio; 219 struct iovec iov[1]; 220 cap_rights_t rights; 221 int error = 0, len; 222 223 if (uap->sinfo != NULL) { 224 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo)); 225 if (error != 0) 226 return (error); 227 u_sinfo = &sinfo; 228 } 229 230 cap_rights_init_one(&rights, CAP_SEND); 231 if (uap->tolen != 0) { 232 error = getsockaddr(&to, uap->to, uap->tolen); 233 if (error != 0) { 234 to = NULL; 235 goto sctp_bad2; 236 } 237 cap_rights_set_one(&rights, CAP_CONNECT); 238 } 239 240 AUDIT_ARG_FD(uap->sd); 241 error = getsock(td, uap->sd, &rights, &fp); 242 if (error != 0) 243 goto sctp_bad; 244 #ifdef KTRACE 245 if (to && (KTRPOINT(td, KTR_STRUCT))) 246 ktrsockaddr(to); 247 #endif 248 249 iov[0].iov_base = uap->msg; 250 iov[0].iov_len = uap->mlen; 251 252 so = (struct socket *)fp->f_data; 253 if (so->so_proto->pr_protocol != IPPROTO_SCTP) { 254 error = EOPNOTSUPP; 255 goto sctp_bad; 256 } 257 #ifdef MAC 258 error = mac_socket_check_send(td->td_ucred, so); 259 if (error != 0) 260 goto sctp_bad; 261 #endif /* MAC */ 262 263 auio.uio_iov = iov; 264 auio.uio_iovcnt = 1; 265 auio.uio_segflg = UIO_USERSPACE; 266 auio.uio_rw = UIO_WRITE; 267 auio.uio_td = td; 268 auio.uio_offset = 0; /* XXX */ 269 auio.uio_resid = 0; 270 #ifdef KTRACE 271 if (KTRPOINT(td, KTR_GENIO)) 272 ktruio = cloneuio(&auio); 273 #endif /* KTRACE */ 274 len = auio.uio_resid = uap->mlen; 275 CURVNET_SET(so->so_vnet); 276 error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL, 277 (struct mbuf *)NULL, uap->flags, u_sinfo, td); 278 CURVNET_RESTORE(); 279 if (error != 0) { 280 if (auio.uio_resid != len && (error == ERESTART || 281 error == EINTR || error == EWOULDBLOCK)) 282 error = 0; 283 /* Generation of SIGPIPE can be controlled per socket. */ 284 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && 285 !(uap->flags & MSG_NOSIGNAL)) { 286 PROC_LOCK(td->td_proc); 287 tdsignal(td, SIGPIPE); 288 PROC_UNLOCK(td->td_proc); 289 } 290 } 291 if (error == 0) 292 td->td_retval[0] = len - auio.uio_resid; 293 #ifdef KTRACE 294 if (ktruio != NULL) { 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 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