| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989, 1990, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * sendfile(2) and related extensions: |
| 6 | * Copyright (c) 1998, David Greenman. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 |
| 37 | * $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.65.2.17 2003/04/04 17:11:16 tegge Exp $ |
| 38 | */ |
| 39 | |
| 40 | #include "opt_ktrace.h" |
| 41 | #include "opt_sctp.h" |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/kernel.h> |
| 46 | #include <sys/sysproto.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/filedesc.h> |
| 49 | #include <sys/event.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/fcntl.h> |
| 52 | #include <sys/file.h> |
| 53 | #include <sys/filio.h> |
| 54 | #include <sys/kern_syscall.h> |
| 55 | #include <sys/mbuf.h> |
| 56 | #include <sys/protosw.h> |
| 57 | #include <sys/sfbuf.h> |
| 58 | #include <sys/socket.h> |
| 59 | #include <sys/socketvar.h> |
| 60 | #include <sys/socketops.h> |
| 61 | #include <sys/uio.h> |
| 62 | #include <sys/vnode.h> |
| 63 | #include <sys/lock.h> |
| 64 | #include <sys/mount.h> |
| 65 | #ifdef KTRACE |
| 66 | #include <sys/ktrace.h> |
| 67 | #endif |
| 68 | #include <vm/vm.h> |
| 69 | #include <vm/vm_object.h> |
| 70 | #include <vm/vm_page.h> |
| 71 | #include <vm/vm_pageout.h> |
| 72 | #include <vm/vm_kern.h> |
| 73 | #include <vm/vm_extern.h> |
| 74 | #include <sys/file2.h> |
| 75 | #include <sys/signalvar.h> |
| 76 | #include <sys/serialize.h> |
| 77 | |
| 78 | #include <sys/thread2.h> |
| 79 | #include <sys/msgport2.h> |
| 80 | #include <sys/socketvar2.h> |
| 81 | #include <net/netmsg2.h> |
| 82 | |
| 83 | #ifdef SCTP |
| 84 | #include <netinet/sctp_peeloff.h> |
| 85 | #endif /* SCTP */ |
| 86 | |
| 87 | extern int use_soaccept_pred_fast; |
| 88 | |
| 89 | /* |
| 90 | * System call interface to the socket abstraction. |
| 91 | */ |
| 92 | |
| 93 | extern struct fileops socketops; |
| 94 | |
| 95 | /* |
| 96 | * socket_args(int domain, int type, int protocol) |
| 97 | */ |
| 98 | int |
| 99 | kern_socket(int domain, int type, int protocol, int *res) |
| 100 | { |
| 101 | struct thread *td = curthread; |
| 102 | struct filedesc *fdp = td->td_proc->p_fd; |
| 103 | struct socket *so; |
| 104 | struct file *fp; |
| 105 | int fd, error; |
| 106 | |
| 107 | KKASSERT(td->td_lwp); |
| 108 | |
| 109 | error = falloc(td->td_lwp, &fp, &fd); |
| 110 | if (error) |
| 111 | return (error); |
| 112 | error = socreate(domain, &so, type, protocol, td); |
| 113 | if (error) { |
| 114 | fsetfd(fdp, NULL, fd); |
| 115 | } else { |
| 116 | fp->f_type = DTYPE_SOCKET; |
| 117 | fp->f_flag = FREAD | FWRITE; |
| 118 | fp->f_ops = &socketops; |
| 119 | fp->f_data = so; |
| 120 | *res = fd; |
| 121 | fsetfd(fdp, fp, fd); |
| 122 | } |
| 123 | fdrop(fp); |
| 124 | return (error); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * MPALMOSTSAFE |
| 129 | */ |
| 130 | int |
| 131 | sys_socket(struct socket_args *uap) |
| 132 | { |
| 133 | int error; |
| 134 | |
| 135 | error = kern_socket(uap->domain, uap->type, uap->protocol, |
| 136 | &uap->sysmsg_iresult); |
| 137 | |
| 138 | return (error); |
| 139 | } |
| 140 | |
| 141 | int |
| 142 | kern_bind(int s, struct sockaddr *sa) |
| 143 | { |
| 144 | struct thread *td = curthread; |
| 145 | struct proc *p = td->td_proc; |
| 146 | struct file *fp; |
| 147 | int error; |
| 148 | |
| 149 | KKASSERT(p); |
| 150 | error = holdsock(p->p_fd, s, &fp); |
| 151 | if (error) |
| 152 | return (error); |
| 153 | error = sobind((struct socket *)fp->f_data, sa, td); |
| 154 | fdrop(fp); |
| 155 | return (error); |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * bind_args(int s, caddr_t name, int namelen) |
| 160 | * |
| 161 | * MPALMOSTSAFE |
| 162 | */ |
| 163 | int |
| 164 | sys_bind(struct bind_args *uap) |
| 165 | { |
| 166 | struct sockaddr *sa; |
| 167 | int error; |
| 168 | |
| 169 | error = getsockaddr(&sa, uap->name, uap->namelen); |
| 170 | if (error) |
| 171 | return (error); |
| 172 | error = kern_bind(uap->s, sa); |
| 173 | FREE(sa, M_SONAME); |
| 174 | |
| 175 | return (error); |
| 176 | } |
| 177 | |
| 178 | int |
| 179 | kern_listen(int s, int backlog) |
| 180 | { |
| 181 | struct thread *td = curthread; |
| 182 | struct proc *p = td->td_proc; |
| 183 | struct file *fp; |
| 184 | int error; |
| 185 | |
| 186 | KKASSERT(p); |
| 187 | error = holdsock(p->p_fd, s, &fp); |
| 188 | if (error) |
| 189 | return (error); |
| 190 | error = solisten((struct socket *)fp->f_data, backlog, td); |
| 191 | fdrop(fp); |
| 192 | return(error); |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * listen_args(int s, int backlog) |
| 197 | * |
| 198 | * MPALMOSTSAFE |
| 199 | */ |
| 200 | int |
| 201 | sys_listen(struct listen_args *uap) |
| 202 | { |
| 203 | int error; |
| 204 | |
| 205 | error = kern_listen(uap->s, uap->backlog); |
| 206 | return (error); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Returns the accepted socket as well. |
| 211 | * |
| 212 | * NOTE! The sockets sitting on so_comp/so_incomp might have 0 refs, the |
| 213 | * pool token is absolutely required to avoid a sofree() race, |
| 214 | * as well as to avoid tailq handling races. |
| 215 | */ |
| 216 | static boolean_t |
| 217 | soaccept_predicate(struct netmsg_so_notify *msg) |
| 218 | { |
| 219 | struct socket *head = msg->base.nm_so; |
| 220 | struct socket *so; |
| 221 | |
| 222 | if (head->so_error != 0) { |
| 223 | msg->base.lmsg.ms_error = head->so_error; |
| 224 | return (TRUE); |
| 225 | } |
| 226 | lwkt_getpooltoken(head); |
| 227 | if (!TAILQ_EMPTY(&head->so_comp)) { |
| 228 | /* Abuse nm_so field as copy in/copy out parameter. XXX JH */ |
| 229 | so = TAILQ_FIRST(&head->so_comp); |
| 230 | TAILQ_REMOVE(&head->so_comp, so, so_list); |
| 231 | head->so_qlen--; |
| 232 | soclrstate(so, SS_COMP); |
| 233 | so->so_head = NULL; |
| 234 | soreference(so); |
| 235 | |
| 236 | lwkt_relpooltoken(head); |
| 237 | |
| 238 | msg->base.lmsg.ms_error = 0; |
| 239 | msg->base.nm_so = so; |
| 240 | return (TRUE); |
| 241 | } |
| 242 | lwkt_relpooltoken(head); |
| 243 | if (head->so_state & SS_CANTRCVMORE) { |
| 244 | msg->base.lmsg.ms_error = ECONNABORTED; |
| 245 | return (TRUE); |
| 246 | } |
| 247 | if (msg->nm_fflags & FNONBLOCK) { |
| 248 | msg->base.lmsg.ms_error = EWOULDBLOCK; |
| 249 | return (TRUE); |
| 250 | } |
| 251 | |
| 252 | return (FALSE); |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * The second argument to kern_accept() is a handle to a struct sockaddr. |
| 257 | * This allows kern_accept() to return a pointer to an allocated struct |
| 258 | * sockaddr which must be freed later with FREE(). The caller must |
| 259 | * initialize *name to NULL. |
| 260 | */ |
| 261 | int |
| 262 | kern_accept(int s, int fflags, struct sockaddr **name, int *namelen, int *res) |
| 263 | { |
| 264 | struct thread *td = curthread; |
| 265 | struct filedesc *fdp = td->td_proc->p_fd; |
| 266 | struct file *lfp = NULL; |
| 267 | struct file *nfp = NULL; |
| 268 | struct sockaddr *sa; |
| 269 | struct socket *head, *so; |
| 270 | struct netmsg_so_notify msg; |
| 271 | int fd; |
| 272 | u_int fflag; /* type must match fp->f_flag */ |
| 273 | int error, tmp; |
| 274 | |
| 275 | *res = -1; |
| 276 | if (name && namelen && *namelen < 0) |
| 277 | return (EINVAL); |
| 278 | |
| 279 | error = holdsock(td->td_proc->p_fd, s, &lfp); |
| 280 | if (error) |
| 281 | return (error); |
| 282 | |
| 283 | error = falloc(td->td_lwp, &nfp, &fd); |
| 284 | if (error) { /* Probably ran out of file descriptors. */ |
| 285 | fdrop(lfp); |
| 286 | return (error); |
| 287 | } |
| 288 | head = (struct socket *)lfp->f_data; |
| 289 | if ((head->so_options & SO_ACCEPTCONN) == 0) { |
| 290 | error = EINVAL; |
| 291 | goto done; |
| 292 | } |
| 293 | |
| 294 | if (fflags & O_FBLOCKING) |
| 295 | fflags |= lfp->f_flag & ~FNONBLOCK; |
| 296 | else if (fflags & O_FNONBLOCKING) |
| 297 | fflags |= lfp->f_flag | FNONBLOCK; |
| 298 | else |
| 299 | fflags = lfp->f_flag; |
| 300 | |
| 301 | if (use_soaccept_pred_fast) { |
| 302 | boolean_t pred; |
| 303 | |
| 304 | /* Initialize necessary parts for soaccept_predicate() */ |
| 305 | netmsg_init(&msg.base, head, &netisr_apanic_rport, 0, NULL); |
| 306 | msg.nm_fflags = fflags; |
| 307 | |
| 308 | lwkt_getpooltoken(head); |
| 309 | pred = soaccept_predicate(&msg); |
| 310 | lwkt_relpooltoken(head); |
| 311 | |
| 312 | if (pred) { |
| 313 | error = msg.base.lmsg.ms_error; |
| 314 | if (error) |
| 315 | goto done; |
| 316 | else |
| 317 | goto accepted; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* optimize for uniprocessor case later XXX JH */ |
| 322 | netmsg_init_abortable(&msg.base, head, &curthread->td_msgport, |
| 323 | 0, netmsg_so_notify, netmsg_so_notify_doabort); |
| 324 | msg.nm_predicate = soaccept_predicate; |
| 325 | msg.nm_fflags = fflags; |
| 326 | msg.nm_etype = NM_REVENT; |
| 327 | error = lwkt_domsg(head->so_port, &msg.base.lmsg, PCATCH); |
| 328 | if (error) |
| 329 | goto done; |
| 330 | |
| 331 | accepted: |
| 332 | /* |
| 333 | * At this point we have the connection that's ready to be accepted. |
| 334 | * |
| 335 | * NOTE! soaccept_predicate() ref'd so for us, and soaccept() expects |
| 336 | * to eat the ref and turn it into a descriptor. |
| 337 | */ |
| 338 | so = msg.base.nm_so; |
| 339 | |
| 340 | fflag = lfp->f_flag; |
| 341 | |
| 342 | /* connection has been removed from the listen queue */ |
| 343 | KNOTE(&head->so_rcv.ssb_kq.ki_note, 0); |
| 344 | |
| 345 | if (head->so_sigio != NULL) |
| 346 | fsetown(fgetown(&head->so_sigio), &so->so_sigio); |
| 347 | |
| 348 | nfp->f_type = DTYPE_SOCKET; |
| 349 | nfp->f_flag = fflag; |
| 350 | nfp->f_ops = &socketops; |
| 351 | nfp->f_data = so; |
| 352 | /* Sync socket nonblocking/async state with file flags */ |
| 353 | tmp = fflag & FNONBLOCK; |
| 354 | fo_ioctl(nfp, FIONBIO, (caddr_t)&tmp, td->td_ucred, NULL); |
| 355 | tmp = fflag & FASYNC; |
| 356 | fo_ioctl(nfp, FIOASYNC, (caddr_t)&tmp, td->td_ucred, NULL); |
| 357 | |
| 358 | sa = NULL; |
| 359 | if (so->so_faddr != NULL) { |
| 360 | sa = so->so_faddr; |
| 361 | so->so_faddr = NULL; |
| 362 | |
| 363 | soaccept_generic(so); |
| 364 | error = 0; |
| 365 | } else { |
| 366 | error = soaccept(so, &sa); |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Set the returned name and namelen as applicable. Set the returned |
| 371 | * namelen to 0 for older code which might ignore the return value |
| 372 | * from accept. |
| 373 | */ |
| 374 | if (error == 0) { |
| 375 | if (sa && name && namelen) { |
| 376 | if (*namelen > sa->sa_len) |
| 377 | *namelen = sa->sa_len; |
| 378 | *name = sa; |
| 379 | } else { |
| 380 | if (sa) |
| 381 | FREE(sa, M_SONAME); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | done: |
| 386 | /* |
| 387 | * If an error occured clear the reserved descriptor, else associate |
| 388 | * nfp with it. |
| 389 | * |
| 390 | * Note that *res is normally ignored if an error is returned but |
| 391 | * a syscall message will still have access to the result code. |
| 392 | */ |
| 393 | if (error) { |
| 394 | fsetfd(fdp, NULL, fd); |
| 395 | } else { |
| 396 | *res = fd; |
| 397 | fsetfd(fdp, nfp, fd); |
| 398 | } |
| 399 | fdrop(nfp); |
| 400 | fdrop(lfp); |
| 401 | return (error); |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * accept(int s, caddr_t name, int *anamelen) |
| 406 | * |
| 407 | * MPALMOSTSAFE |
| 408 | */ |
| 409 | int |
| 410 | sys_accept(struct accept_args *uap) |
| 411 | { |
| 412 | struct sockaddr *sa = NULL; |
| 413 | int sa_len; |
| 414 | int error; |
| 415 | |
| 416 | if (uap->name) { |
| 417 | error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); |
| 418 | if (error) |
| 419 | return (error); |
| 420 | |
| 421 | error = kern_accept(uap->s, 0, &sa, &sa_len, |
| 422 | &uap->sysmsg_iresult); |
| 423 | |
| 424 | if (error == 0) |
| 425 | error = copyout(sa, uap->name, sa_len); |
| 426 | if (error == 0) { |
| 427 | error = copyout(&sa_len, uap->anamelen, |
| 428 | sizeof(*uap->anamelen)); |
| 429 | } |
| 430 | if (sa) |
| 431 | FREE(sa, M_SONAME); |
| 432 | } else { |
| 433 | error = kern_accept(uap->s, 0, NULL, 0, |
| 434 | &uap->sysmsg_iresult); |
| 435 | } |
| 436 | return (error); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * extaccept(int s, int fflags, caddr_t name, int *anamelen) |
| 441 | * |
| 442 | * MPALMOSTSAFE |
| 443 | */ |
| 444 | int |
| 445 | sys_extaccept(struct extaccept_args *uap) |
| 446 | { |
| 447 | struct sockaddr *sa = NULL; |
| 448 | int sa_len; |
| 449 | int error; |
| 450 | int fflags = uap->flags & O_FMASK; |
| 451 | |
| 452 | if (uap->name) { |
| 453 | error = copyin(uap->anamelen, &sa_len, sizeof(sa_len)); |
| 454 | if (error) |
| 455 | return (error); |
| 456 | |
| 457 | error = kern_accept(uap->s, fflags, &sa, &sa_len, |
| 458 | &uap->sysmsg_iresult); |
| 459 | |
| 460 | if (error == 0) |
| 461 | error = copyout(sa, uap->name, sa_len); |
| 462 | if (error == 0) { |
| 463 | error = copyout(&sa_len, uap->anamelen, |
| 464 | sizeof(*uap->anamelen)); |
| 465 | } |
| 466 | if (sa) |
| 467 | FREE(sa, M_SONAME); |
| 468 | } else { |
| 469 | error = kern_accept(uap->s, fflags, NULL, 0, |
| 470 | &uap->sysmsg_iresult); |
| 471 | } |
| 472 | return (error); |
| 473 | } |
| 474 | |
| 475 | |
| 476 | /* |
| 477 | * Returns TRUE if predicate satisfied. |
| 478 | */ |
| 479 | static boolean_t |
| 480 | soconnected_predicate(struct netmsg_so_notify *msg) |
| 481 | { |
| 482 | struct socket *so = msg->base.nm_so; |
| 483 | |
| 484 | /* check predicate */ |
| 485 | if (!(so->so_state & SS_ISCONNECTING) || so->so_error != 0) { |
| 486 | msg->base.lmsg.ms_error = so->so_error; |
| 487 | return (TRUE); |
| 488 | } |
| 489 | |
| 490 | return (FALSE); |
| 491 | } |
| 492 | |
| 493 | int |
| 494 | kern_connect(int s, int fflags, struct sockaddr *sa) |
| 495 | { |
| 496 | struct thread *td = curthread; |
| 497 | struct proc *p = td->td_proc; |
| 498 | struct file *fp; |
| 499 | struct socket *so; |
| 500 | int error, interrupted = 0; |
| 501 | |
| 502 | error = holdsock(p->p_fd, s, &fp); |
| 503 | if (error) |
| 504 | return (error); |
| 505 | so = (struct socket *)fp->f_data; |
| 506 | |
| 507 | if (fflags & O_FBLOCKING) |
| 508 | /* fflags &= ~FNONBLOCK; */; |
| 509 | else if (fflags & O_FNONBLOCKING) |
| 510 | fflags |= FNONBLOCK; |
| 511 | else |
| 512 | fflags = fp->f_flag; |
| 513 | |
| 514 | if (so->so_state & SS_ISCONNECTING) { |
| 515 | error = EALREADY; |
| 516 | goto done; |
| 517 | } |
| 518 | error = soconnect(so, sa, td); |
| 519 | if (error) |
| 520 | goto bad; |
| 521 | if ((fflags & FNONBLOCK) && (so->so_state & SS_ISCONNECTING)) { |
| 522 | error = EINPROGRESS; |
| 523 | goto done; |
| 524 | } |
| 525 | if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { |
| 526 | struct netmsg_so_notify msg; |
| 527 | |
| 528 | netmsg_init_abortable(&msg.base, so, |
| 529 | &curthread->td_msgport, |
| 530 | 0, |
| 531 | netmsg_so_notify, |
| 532 | netmsg_so_notify_doabort); |
| 533 | msg.nm_predicate = soconnected_predicate; |
| 534 | msg.nm_etype = NM_REVENT; |
| 535 | error = lwkt_domsg(so->so_port, &msg.base.lmsg, PCATCH); |
| 536 | if (error == EINTR || error == ERESTART) |
| 537 | interrupted = 1; |
| 538 | } |
| 539 | if (error == 0) { |
| 540 | error = so->so_error; |
| 541 | so->so_error = 0; |
| 542 | } |
| 543 | bad: |
| 544 | if (!interrupted) |
| 545 | soclrstate(so, SS_ISCONNECTING); |
| 546 | if (error == ERESTART) |
| 547 | error = EINTR; |
| 548 | done: |
| 549 | fdrop(fp); |
| 550 | return (error); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * connect_args(int s, caddr_t name, int namelen) |
| 555 | * |
| 556 | * MPALMOSTSAFE |
| 557 | */ |
| 558 | int |
| 559 | sys_connect(struct connect_args *uap) |
| 560 | { |
| 561 | struct sockaddr *sa; |
| 562 | int error; |
| 563 | |
| 564 | error = getsockaddr(&sa, uap->name, uap->namelen); |
| 565 | if (error) |
| 566 | return (error); |
| 567 | error = kern_connect(uap->s, 0, sa); |
| 568 | FREE(sa, M_SONAME); |
| 569 | |
| 570 | return (error); |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * connect_args(int s, int fflags, caddr_t name, int namelen) |
| 575 | * |
| 576 | * MPALMOSTSAFE |
| 577 | */ |
| 578 | int |
| 579 | sys_extconnect(struct extconnect_args *uap) |
| 580 | { |
| 581 | struct sockaddr *sa; |
| 582 | int error; |
| 583 | int fflags = uap->flags & O_FMASK; |
| 584 | |
| 585 | error = getsockaddr(&sa, uap->name, uap->namelen); |
| 586 | if (error) |
| 587 | return (error); |
| 588 | error = kern_connect(uap->s, fflags, sa); |
| 589 | FREE(sa, M_SONAME); |
| 590 | |
| 591 | return (error); |
| 592 | } |
| 593 | |
| 594 | int |
| 595 | kern_socketpair(int domain, int type, int protocol, int *sv) |
| 596 | { |
| 597 | struct thread *td = curthread; |
| 598 | struct filedesc *fdp; |
| 599 | struct file *fp1, *fp2; |
| 600 | struct socket *so1, *so2; |
| 601 | int fd1, fd2, error; |
| 602 | |
| 603 | fdp = td->td_proc->p_fd; |
| 604 | error = socreate(domain, &so1, type, protocol, td); |
| 605 | if (error) |
| 606 | return (error); |
| 607 | error = socreate(domain, &so2, type, protocol, td); |
| 608 | if (error) |
| 609 | goto free1; |
| 610 | error = falloc(td->td_lwp, &fp1, &fd1); |
| 611 | if (error) |
| 612 | goto free2; |
| 613 | sv[0] = fd1; |
| 614 | fp1->f_data = so1; |
| 615 | error = falloc(td->td_lwp, &fp2, &fd2); |
| 616 | if (error) |
| 617 | goto free3; |
| 618 | fp2->f_data = so2; |
| 619 | sv[1] = fd2; |
| 620 | error = soconnect2(so1, so2); |
| 621 | if (error) |
| 622 | goto free4; |
| 623 | if (type == SOCK_DGRAM) { |
| 624 | /* |
| 625 | * Datagram socket connection is asymmetric. |
| 626 | */ |
| 627 | error = soconnect2(so2, so1); |
| 628 | if (error) |
| 629 | goto free4; |
| 630 | } |
| 631 | fp1->f_type = fp2->f_type = DTYPE_SOCKET; |
| 632 | fp1->f_flag = fp2->f_flag = FREAD|FWRITE; |
| 633 | fp1->f_ops = fp2->f_ops = &socketops; |
| 634 | fsetfd(fdp, fp1, fd1); |
| 635 | fsetfd(fdp, fp2, fd2); |
| 636 | fdrop(fp1); |
| 637 | fdrop(fp2); |
| 638 | return (error); |
| 639 | free4: |
| 640 | fsetfd(fdp, NULL, fd2); |
| 641 | fdrop(fp2); |
| 642 | free3: |
| 643 | fsetfd(fdp, NULL, fd1); |
| 644 | fdrop(fp1); |
| 645 | free2: |
| 646 | (void)soclose(so2, 0); |
| 647 | free1: |
| 648 | (void)soclose(so1, 0); |
| 649 | return (error); |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * socketpair(int domain, int type, int protocol, int *rsv) |
| 654 | */ |
| 655 | int |
| 656 | sys_socketpair(struct socketpair_args *uap) |
| 657 | { |
| 658 | int error, sockv[2]; |
| 659 | |
| 660 | error = kern_socketpair(uap->domain, uap->type, uap->protocol, sockv); |
| 661 | |
| 662 | if (error == 0) { |
| 663 | error = copyout(sockv, uap->rsv, sizeof(sockv)); |
| 664 | |
| 665 | if (error != 0) { |
| 666 | kern_close(sockv[0]); |
| 667 | kern_close(sockv[1]); |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | return (error); |
| 672 | } |
| 673 | |
| 674 | int |
| 675 | kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio, |
| 676 | struct mbuf *control, int flags, size_t *res) |
| 677 | { |
| 678 | struct thread *td = curthread; |
| 679 | struct lwp *lp = td->td_lwp; |
| 680 | struct proc *p = td->td_proc; |
| 681 | struct file *fp; |
| 682 | size_t len; |
| 683 | int error; |
| 684 | struct socket *so; |
| 685 | #ifdef KTRACE |
| 686 | struct iovec *ktriov = NULL; |
| 687 | struct uio ktruio; |
| 688 | #endif |
| 689 | |
| 690 | error = holdsock(p->p_fd, s, &fp); |
| 691 | if (error) |
| 692 | return (error); |
| 693 | #ifdef KTRACE |
| 694 | if (KTRPOINT(td, KTR_GENIO)) { |
| 695 | int iovlen = auio->uio_iovcnt * sizeof (struct iovec); |
| 696 | |
| 697 | MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); |
| 698 | bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); |
| 699 | ktruio = *auio; |
| 700 | } |
| 701 | #endif |
| 702 | len = auio->uio_resid; |
| 703 | so = (struct socket *)fp->f_data; |
| 704 | if ((flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { |
| 705 | if (fp->f_flag & FNONBLOCK) |
| 706 | flags |= MSG_FNONBLOCKING; |
| 707 | } |
| 708 | error = so_pru_sosend(so, sa, auio, NULL, control, flags, td); |
| 709 | if (error) { |
| 710 | if (auio->uio_resid != len && (error == ERESTART || |
| 711 | error == EINTR || error == EWOULDBLOCK)) |
| 712 | error = 0; |
| 713 | if (error == EPIPE && !(flags & MSG_NOSIGNAL)) |
| 714 | lwpsignal(p, lp, SIGPIPE); |
| 715 | } |
| 716 | #ifdef KTRACE |
| 717 | if (ktriov != NULL) { |
| 718 | if (error == 0) { |
| 719 | ktruio.uio_iov = ktriov; |
| 720 | ktruio.uio_resid = len - auio->uio_resid; |
| 721 | ktrgenio(lp, s, UIO_WRITE, &ktruio, error); |
| 722 | } |
| 723 | FREE(ktriov, M_TEMP); |
| 724 | } |
| 725 | #endif |
| 726 | if (error == 0) |
| 727 | *res = len - auio->uio_resid; |
| 728 | fdrop(fp); |
| 729 | return (error); |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * sendto_args(int s, caddr_t buf, size_t len, int flags, caddr_t to, int tolen) |
| 734 | * |
| 735 | * MPALMOSTSAFE |
| 736 | */ |
| 737 | int |
| 738 | sys_sendto(struct sendto_args *uap) |
| 739 | { |
| 740 | struct thread *td = curthread; |
| 741 | struct uio auio; |
| 742 | struct iovec aiov; |
| 743 | struct sockaddr *sa = NULL; |
| 744 | int error; |
| 745 | |
| 746 | if (uap->to) { |
| 747 | error = getsockaddr(&sa, uap->to, uap->tolen); |
| 748 | if (error) |
| 749 | return (error); |
| 750 | } |
| 751 | aiov.iov_base = uap->buf; |
| 752 | aiov.iov_len = uap->len; |
| 753 | auio.uio_iov = &aiov; |
| 754 | auio.uio_iovcnt = 1; |
| 755 | auio.uio_offset = 0; |
| 756 | auio.uio_resid = uap->len; |
| 757 | auio.uio_segflg = UIO_USERSPACE; |
| 758 | auio.uio_rw = UIO_WRITE; |
| 759 | auio.uio_td = td; |
| 760 | |
| 761 | error = kern_sendmsg(uap->s, sa, &auio, NULL, uap->flags, |
| 762 | &uap->sysmsg_szresult); |
| 763 | |
| 764 | if (sa) |
| 765 | FREE(sa, M_SONAME); |
| 766 | return (error); |
| 767 | } |
| 768 | |
| 769 | /* |
| 770 | * sendmsg_args(int s, caddr_t msg, int flags) |
| 771 | * |
| 772 | * MPALMOSTSAFE |
| 773 | */ |
| 774 | int |
| 775 | sys_sendmsg(struct sendmsg_args *uap) |
| 776 | { |
| 777 | struct thread *td = curthread; |
| 778 | struct msghdr msg; |
| 779 | struct uio auio; |
| 780 | struct iovec aiov[UIO_SMALLIOV], *iov = NULL; |
| 781 | struct sockaddr *sa = NULL; |
| 782 | struct mbuf *control = NULL; |
| 783 | int error; |
| 784 | |
| 785 | error = copyin(uap->msg, (caddr_t)&msg, sizeof(msg)); |
| 786 | if (error) |
| 787 | return (error); |
| 788 | |
| 789 | /* |
| 790 | * Conditionally copyin msg.msg_name. |
| 791 | */ |
| 792 | if (msg.msg_name) { |
| 793 | error = getsockaddr(&sa, msg.msg_name, msg.msg_namelen); |
| 794 | if (error) |
| 795 | return (error); |
| 796 | } |
| 797 | |
| 798 | /* |
| 799 | * Populate auio. |
| 800 | */ |
| 801 | error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, |
| 802 | &auio.uio_resid); |
| 803 | if (error) |
| 804 | goto cleanup2; |
| 805 | auio.uio_iov = iov; |
| 806 | auio.uio_iovcnt = msg.msg_iovlen; |
| 807 | auio.uio_offset = 0; |
| 808 | auio.uio_segflg = UIO_USERSPACE; |
| 809 | auio.uio_rw = UIO_WRITE; |
| 810 | auio.uio_td = td; |
| 811 | |
| 812 | /* |
| 813 | * Conditionally copyin msg.msg_control. |
| 814 | */ |
| 815 | if (msg.msg_control) { |
| 816 | if (msg.msg_controllen < sizeof(struct cmsghdr) || |
| 817 | msg.msg_controllen > MLEN) { |
| 818 | error = EINVAL; |
| 819 | goto cleanup; |
| 820 | } |
| 821 | control = m_get(MB_WAIT, MT_CONTROL); |
| 822 | if (control == NULL) { |
| 823 | error = ENOBUFS; |
| 824 | goto cleanup; |
| 825 | } |
| 826 | control->m_len = msg.msg_controllen; |
| 827 | error = copyin(msg.msg_control, mtod(control, caddr_t), |
| 828 | msg.msg_controllen); |
| 829 | if (error) { |
| 830 | m_free(control); |
| 831 | goto cleanup; |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | error = kern_sendmsg(uap->s, sa, &auio, control, uap->flags, |
| 836 | &uap->sysmsg_szresult); |
| 837 | |
| 838 | cleanup: |
| 839 | iovec_free(&iov, aiov); |
| 840 | cleanup2: |
| 841 | if (sa) |
| 842 | FREE(sa, M_SONAME); |
| 843 | return (error); |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * kern_recvmsg() takes a handle to sa and control. If the handle is non- |
| 848 | * null, it returns a dynamically allocated struct sockaddr and an mbuf. |
| 849 | * Don't forget to FREE() and m_free() these if they are returned. |
| 850 | */ |
| 851 | int |
| 852 | kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio, |
| 853 | struct mbuf **control, int *flags, size_t *res) |
| 854 | { |
| 855 | struct thread *td = curthread; |
| 856 | struct proc *p = td->td_proc; |
| 857 | struct file *fp; |
| 858 | size_t len; |
| 859 | int error; |
| 860 | int lflags; |
| 861 | struct socket *so; |
| 862 | #ifdef KTRACE |
| 863 | struct iovec *ktriov = NULL; |
| 864 | struct uio ktruio; |
| 865 | #endif |
| 866 | |
| 867 | error = holdsock(p->p_fd, s, &fp); |
| 868 | if (error) |
| 869 | return (error); |
| 870 | #ifdef KTRACE |
| 871 | if (KTRPOINT(td, KTR_GENIO)) { |
| 872 | int iovlen = auio->uio_iovcnt * sizeof (struct iovec); |
| 873 | |
| 874 | MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); |
| 875 | bcopy(auio->uio_iov, ktriov, iovlen); |
| 876 | ktruio = *auio; |
| 877 | } |
| 878 | #endif |
| 879 | len = auio->uio_resid; |
| 880 | so = (struct socket *)fp->f_data; |
| 881 | |
| 882 | if (flags == NULL || (*flags & (MSG_FNONBLOCKING|MSG_FBLOCKING)) == 0) { |
| 883 | if (fp->f_flag & FNONBLOCK) { |
| 884 | if (flags) { |
| 885 | *flags |= MSG_FNONBLOCKING; |
| 886 | } else { |
| 887 | lflags = MSG_FNONBLOCKING; |
| 888 | flags = &lflags; |
| 889 | } |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | error = so_pru_soreceive(so, sa, auio, NULL, control, flags); |
| 894 | if (error) { |
| 895 | if (auio->uio_resid != len && (error == ERESTART || |
| 896 | error == EINTR || error == EWOULDBLOCK)) |
| 897 | error = 0; |
| 898 | } |
| 899 | #ifdef KTRACE |
| 900 | if (ktriov != NULL) { |
| 901 | if (error == 0) { |
| 902 | ktruio.uio_iov = ktriov; |
| 903 | ktruio.uio_resid = len - auio->uio_resid; |
| 904 | ktrgenio(td->td_lwp, s, UIO_READ, &ktruio, error); |
| 905 | } |
| 906 | FREE(ktriov, M_TEMP); |
| 907 | } |
| 908 | #endif |
| 909 | if (error == 0) |
| 910 | *res = len - auio->uio_resid; |
| 911 | fdrop(fp); |
| 912 | return (error); |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | * recvfrom_args(int s, caddr_t buf, size_t len, int flags, |
| 917 | * caddr_t from, int *fromlenaddr) |
| 918 | * |
| 919 | * MPALMOSTSAFE |
| 920 | */ |
| 921 | int |
| 922 | sys_recvfrom(struct recvfrom_args *uap) |
| 923 | { |
| 924 | struct thread *td = curthread; |
| 925 | struct uio auio; |
| 926 | struct iovec aiov; |
| 927 | struct sockaddr *sa = NULL; |
| 928 | int error, fromlen; |
| 929 | |
| 930 | if (uap->from && uap->fromlenaddr) { |
| 931 | error = copyin(uap->fromlenaddr, &fromlen, sizeof(fromlen)); |
| 932 | if (error) |
| 933 | return (error); |
| 934 | if (fromlen < 0) |
| 935 | return (EINVAL); |
| 936 | } else { |
| 937 | fromlen = 0; |
| 938 | } |
| 939 | aiov.iov_base = uap->buf; |
| 940 | aiov.iov_len = uap->len; |
| 941 | auio.uio_iov = &aiov; |
| 942 | auio.uio_iovcnt = 1; |
| 943 | auio.uio_offset = 0; |
| 944 | auio.uio_resid = uap->len; |
| 945 | auio.uio_segflg = UIO_USERSPACE; |
| 946 | auio.uio_rw = UIO_READ; |
| 947 | auio.uio_td = td; |
| 948 | |
| 949 | error = kern_recvmsg(uap->s, uap->from ? &sa : NULL, &auio, NULL, |
| 950 | &uap->flags, &uap->sysmsg_szresult); |
| 951 | |
| 952 | if (error == 0 && uap->from) { |
| 953 | /* note: sa may still be NULL */ |
| 954 | if (sa) { |
| 955 | fromlen = MIN(fromlen, sa->sa_len); |
| 956 | error = copyout(sa, uap->from, fromlen); |
| 957 | } else { |
| 958 | fromlen = 0; |
| 959 | } |
| 960 | if (error == 0) { |
| 961 | error = copyout(&fromlen, uap->fromlenaddr, |
| 962 | sizeof(fromlen)); |
| 963 | } |
| 964 | } |
| 965 | if (sa) |
| 966 | FREE(sa, M_SONAME); |
| 967 | |
| 968 | return (error); |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * recvmsg_args(int s, struct msghdr *msg, int flags) |
| 973 | * |
| 974 | * MPALMOSTSAFE |
| 975 | */ |
| 976 | int |
| 977 | sys_recvmsg(struct recvmsg_args *uap) |
| 978 | { |
| 979 | struct thread *td = curthread; |
| 980 | struct msghdr msg; |
| 981 | struct uio auio; |
| 982 | struct iovec aiov[UIO_SMALLIOV], *iov = NULL; |
| 983 | struct mbuf *m, *control = NULL; |
| 984 | struct sockaddr *sa = NULL; |
| 985 | caddr_t ctlbuf; |
| 986 | socklen_t *ufromlenp, *ucontrollenp; |
| 987 | int error, fromlen, controllen, len, flags, *uflagsp; |
| 988 | |
| 989 | /* |
| 990 | * This copyin handles everything except the iovec. |
| 991 | */ |
| 992 | error = copyin(uap->msg, &msg, sizeof(msg)); |
| 993 | if (error) |
| 994 | return (error); |
| 995 | |
| 996 | if (msg.msg_name && msg.msg_namelen < 0) |
| 997 | return (EINVAL); |
| 998 | if (msg.msg_control && msg.msg_controllen < 0) |
| 999 | return (EINVAL); |
| 1000 | |
| 1001 | ufromlenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, |
| 1002 | msg_namelen)); |
| 1003 | ucontrollenp = (socklen_t *)((caddr_t)uap->msg + offsetof(struct msghdr, |
| 1004 | msg_controllen)); |
| 1005 | uflagsp = (int *)((caddr_t)uap->msg + offsetof(struct msghdr, |
| 1006 | msg_flags)); |
| 1007 | |
| 1008 | /* |
| 1009 | * Populate auio. |
| 1010 | */ |
| 1011 | error = iovec_copyin(msg.msg_iov, &iov, aiov, msg.msg_iovlen, |
| 1012 | &auio.uio_resid); |
| 1013 | if (error) |
| 1014 | return (error); |
| 1015 | auio.uio_iov = iov; |
| 1016 | auio.uio_iovcnt = msg.msg_iovlen; |
| 1017 | auio.uio_offset = 0; |
| 1018 | auio.uio_segflg = UIO_USERSPACE; |
| 1019 | auio.uio_rw = UIO_READ; |
| 1020 | auio.uio_td = td; |
| 1021 | |
| 1022 | flags = uap->flags; |
| 1023 | |
| 1024 | error = kern_recvmsg(uap->s, |
| 1025 | (msg.msg_name ? &sa : NULL), &auio, |
| 1026 | (msg.msg_control ? &control : NULL), &flags, |
| 1027 | &uap->sysmsg_szresult); |
| 1028 | |
| 1029 | /* |
| 1030 | * Conditionally copyout the name and populate the namelen field. |
| 1031 | */ |
| 1032 | if (error == 0 && msg.msg_name) { |
| 1033 | /* note: sa may still be NULL */ |
| 1034 | if (sa != NULL) { |
| 1035 | fromlen = MIN(msg.msg_namelen, sa->sa_len); |
| 1036 | error = copyout(sa, msg.msg_name, fromlen); |
| 1037 | } else { |
| 1038 | fromlen = 0; |
| 1039 | } |
| 1040 | if (error == 0) |
| 1041 | error = copyout(&fromlen, ufromlenp, |
| 1042 | sizeof(*ufromlenp)); |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * Copyout msg.msg_control and msg.msg_controllen. |
| 1047 | */ |
| 1048 | if (error == 0 && msg.msg_control) { |
| 1049 | len = msg.msg_controllen; |
| 1050 | m = control; |
| 1051 | ctlbuf = (caddr_t)msg.msg_control; |
| 1052 | |
| 1053 | while(m && len > 0) { |
| 1054 | unsigned int tocopy; |
| 1055 | |
| 1056 | if (len >= m->m_len) { |
| 1057 | tocopy = m->m_len; |
| 1058 | } else { |
| 1059 | msg.msg_flags |= MSG_CTRUNC; |
| 1060 | tocopy = len; |
| 1061 | } |
| 1062 | |
| 1063 | error = copyout(mtod(m, caddr_t), ctlbuf, tocopy); |
| 1064 | if (error) |
| 1065 | goto cleanup; |
| 1066 | |
| 1067 | ctlbuf += tocopy; |
| 1068 | len -= tocopy; |
| 1069 | m = m->m_next; |
| 1070 | } |
| 1071 | controllen = ctlbuf - (caddr_t)msg.msg_control; |
| 1072 | error = copyout(&controllen, ucontrollenp, |
| 1073 | sizeof(*ucontrollenp)); |
| 1074 | } |
| 1075 | |
| 1076 | if (error == 0) |
| 1077 | error = copyout(&flags, uflagsp, sizeof(*uflagsp)); |
| 1078 | |
| 1079 | cleanup: |
| 1080 | if (sa) |
| 1081 | FREE(sa, M_SONAME); |
| 1082 | iovec_free(&iov, aiov); |
| 1083 | if (control) |
| 1084 | m_freem(control); |
| 1085 | return (error); |
| 1086 | } |
| 1087 | |
| 1088 | /* |
| 1089 | * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an |
| 1090 | * in kernel pointer instead of a userland pointer. This allows us |
| 1091 | * to manipulate socket options in the emulation code. |
| 1092 | */ |
| 1093 | int |
| 1094 | kern_setsockopt(int s, struct sockopt *sopt) |
| 1095 | { |
| 1096 | struct thread *td = curthread; |
| 1097 | struct proc *p = td->td_proc; |
| 1098 | struct file *fp; |
| 1099 | int error; |
| 1100 | |
| 1101 | if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) |
| 1102 | return (EFAULT); |
| 1103 | if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) |
| 1104 | return (EINVAL); |
| 1105 | if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ |
| 1106 | return (EINVAL); |
| 1107 | |
| 1108 | error = holdsock(p->p_fd, s, &fp); |
| 1109 | if (error) |
| 1110 | return (error); |
| 1111 | |
| 1112 | error = sosetopt((struct socket *)fp->f_data, sopt); |
| 1113 | fdrop(fp); |
| 1114 | return (error); |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * setsockopt_args(int s, int level, int name, caddr_t val, int valsize) |
| 1119 | * |
| 1120 | * MPALMOSTSAFE |
| 1121 | */ |
| 1122 | int |
| 1123 | sys_setsockopt(struct setsockopt_args *uap) |
| 1124 | { |
| 1125 | struct thread *td = curthread; |
| 1126 | struct sockopt sopt; |
| 1127 | int error; |
| 1128 | |
| 1129 | sopt.sopt_level = uap->level; |
| 1130 | sopt.sopt_name = uap->name; |
| 1131 | sopt.sopt_valsize = uap->valsize; |
| 1132 | sopt.sopt_td = td; |
| 1133 | sopt.sopt_val = NULL; |
| 1134 | |
| 1135 | if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ |
| 1136 | return (EINVAL); |
| 1137 | if (uap->val) { |
| 1138 | sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); |
| 1139 | error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); |
| 1140 | if (error) |
| 1141 | goto out; |
| 1142 | } |
| 1143 | |
| 1144 | error = kern_setsockopt(uap->s, &sopt); |
| 1145 | out: |
| 1146 | if (uap->val) |
| 1147 | kfree(sopt.sopt_val, M_TEMP); |
| 1148 | return(error); |
| 1149 | } |
| 1150 | |
| 1151 | /* |
| 1152 | * If sopt->sopt_td == NULL, then sopt->sopt_val is treated as an |
| 1153 | * in kernel pointer instead of a userland pointer. This allows us |
| 1154 | * to manipulate socket options in the emulation code. |
| 1155 | */ |
| 1156 | int |
| 1157 | kern_getsockopt(int s, struct sockopt *sopt) |
| 1158 | { |
| 1159 | struct thread *td = curthread; |
| 1160 | struct proc *p = td->td_proc; |
| 1161 | struct file *fp; |
| 1162 | int error; |
| 1163 | |
| 1164 | if (sopt->sopt_val == NULL && sopt->sopt_valsize != 0) |
| 1165 | return (EFAULT); |
| 1166 | if (sopt->sopt_val != NULL && sopt->sopt_valsize == 0) |
| 1167 | return (EINVAL); |
| 1168 | if (sopt->sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ |
| 1169 | return (EINVAL); |
| 1170 | |
| 1171 | error = holdsock(p->p_fd, s, &fp); |
| 1172 | if (error) |
| 1173 | return (error); |
| 1174 | |
| 1175 | error = sogetopt((struct socket *)fp->f_data, sopt); |
| 1176 | fdrop(fp); |
| 1177 | return (error); |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * getsockopt_args(int s, int level, int name, caddr_t val, int *avalsize) |
| 1182 | * |
| 1183 | * MPALMOSTSAFE |
| 1184 | */ |
| 1185 | int |
| 1186 | sys_getsockopt(struct getsockopt_args *uap) |
| 1187 | { |
| 1188 | struct thread *td = curthread; |
| 1189 | struct sockopt sopt; |
| 1190 | int error, valsize; |
| 1191 | |
| 1192 | if (uap->val) { |
| 1193 | error = copyin(uap->avalsize, &valsize, sizeof(valsize)); |
| 1194 | if (error) |
| 1195 | return (error); |
| 1196 | } else { |
| 1197 | valsize = 0; |
| 1198 | } |
| 1199 | |
| 1200 | sopt.sopt_level = uap->level; |
| 1201 | sopt.sopt_name = uap->name; |
| 1202 | sopt.sopt_valsize = valsize; |
| 1203 | sopt.sopt_td = td; |
| 1204 | sopt.sopt_val = NULL; |
| 1205 | |
| 1206 | if (sopt.sopt_valsize > SOMAXOPT_SIZE) /* unsigned */ |
| 1207 | return (EINVAL); |
| 1208 | if (uap->val) { |
| 1209 | sopt.sopt_val = kmalloc(sopt.sopt_valsize, M_TEMP, M_WAITOK); |
| 1210 | error = copyin(uap->val, sopt.sopt_val, sopt.sopt_valsize); |
| 1211 | if (error) |
| 1212 | goto out; |
| 1213 | } |
| 1214 | |
| 1215 | error = kern_getsockopt(uap->s, &sopt); |
| 1216 | if (error) |
| 1217 | goto out; |
| 1218 | valsize = sopt.sopt_valsize; |
| 1219 | error = copyout(&valsize, uap->avalsize, sizeof(valsize)); |
| 1220 | if (error) |
| 1221 | goto out; |
| 1222 | if (uap->val) |
| 1223 | error = copyout(sopt.sopt_val, uap->val, sopt.sopt_valsize); |
| 1224 | out: |
| 1225 | if (uap->val) |
| 1226 | kfree(sopt.sopt_val, M_TEMP); |
| 1227 | return (error); |
| 1228 | } |
| 1229 | |
| 1230 | /* |
| 1231 | * The second argument to kern_getsockname() is a handle to a struct sockaddr. |
| 1232 | * This allows kern_getsockname() to return a pointer to an allocated struct |
| 1233 | * sockaddr which must be freed later with FREE(). The caller must |
| 1234 | * initialize *name to NULL. |
| 1235 | */ |
| 1236 | int |
| 1237 | kern_getsockname(int s, struct sockaddr **name, int *namelen) |
| 1238 | { |
| 1239 | struct thread *td = curthread; |
| 1240 | struct proc *p = td->td_proc; |
| 1241 | struct file *fp; |
| 1242 | struct socket *so; |
| 1243 | struct sockaddr *sa = NULL; |
| 1244 | int error; |
| 1245 | |
| 1246 | error = holdsock(p->p_fd, s, &fp); |
| 1247 | if (error) |
| 1248 | return (error); |
| 1249 | if (*namelen < 0) { |
| 1250 | fdrop(fp); |
| 1251 | return (EINVAL); |
| 1252 | } |
| 1253 | so = (struct socket *)fp->f_data; |
| 1254 | error = so_pru_sockaddr(so, &sa); |
| 1255 | if (error == 0) { |
| 1256 | if (sa == NULL) { |
| 1257 | *namelen = 0; |
| 1258 | } else { |
| 1259 | *namelen = MIN(*namelen, sa->sa_len); |
| 1260 | *name = sa; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | fdrop(fp); |
| 1265 | return (error); |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * getsockname_args(int fdes, caddr_t asa, int *alen) |
| 1270 | * |
| 1271 | * Get socket name. |
| 1272 | * |
| 1273 | * MPALMOSTSAFE |
| 1274 | */ |
| 1275 | int |
| 1276 | sys_getsockname(struct getsockname_args *uap) |
| 1277 | { |
| 1278 | struct sockaddr *sa = NULL; |
| 1279 | int error, sa_len; |
| 1280 | |
| 1281 | error = copyin(uap->alen, &sa_len, sizeof(sa_len)); |
| 1282 | if (error) |
| 1283 | return (error); |
| 1284 | |
| 1285 | error = kern_getsockname(uap->fdes, &sa, &sa_len); |
| 1286 | |
| 1287 | if (error == 0) |
| 1288 | error = copyout(sa, uap->asa, sa_len); |
| 1289 | if (error == 0) |
| 1290 | error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); |
| 1291 | if (sa) |
| 1292 | FREE(sa, M_SONAME); |
| 1293 | return (error); |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | * The second argument to kern_getpeername() is a handle to a struct sockaddr. |
| 1298 | * This allows kern_getpeername() to return a pointer to an allocated struct |
| 1299 | * sockaddr which must be freed later with FREE(). The caller must |
| 1300 | * initialize *name to NULL. |
| 1301 | */ |
| 1302 | int |
| 1303 | kern_getpeername(int s, struct sockaddr **name, int *namelen) |
| 1304 | { |
| 1305 | struct thread *td = curthread; |
| 1306 | struct proc *p = td->td_proc; |
| 1307 | struct file *fp; |
| 1308 | struct socket *so; |
| 1309 | struct sockaddr *sa = NULL; |
| 1310 | int error; |
| 1311 | |
| 1312 | error = holdsock(p->p_fd, s, &fp); |
| 1313 | if (error) |
| 1314 | return (error); |
| 1315 | if (*namelen < 0) { |
| 1316 | fdrop(fp); |
| 1317 | return (EINVAL); |
| 1318 | } |
| 1319 | so = (struct socket *)fp->f_data; |
| 1320 | if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { |
| 1321 | fdrop(fp); |
| 1322 | return (ENOTCONN); |
| 1323 | } |
| 1324 | error = so_pru_peeraddr(so, &sa); |
| 1325 | if (error == 0) { |
| 1326 | if (sa == NULL) { |
| 1327 | *namelen = 0; |
| 1328 | } else { |
| 1329 | *namelen = MIN(*namelen, sa->sa_len); |
| 1330 | *name = sa; |
| 1331 | } |
| 1332 | } |
| 1333 | |
| 1334 | fdrop(fp); |
| 1335 | return (error); |
| 1336 | } |
| 1337 | |
| 1338 | /* |
| 1339 | * getpeername_args(int fdes, caddr_t asa, int *alen) |
| 1340 | * |
| 1341 | * Get name of peer for connected socket. |
| 1342 | * |
| 1343 | * MPALMOSTSAFE |
| 1344 | */ |
| 1345 | int |
| 1346 | sys_getpeername(struct getpeername_args *uap) |
| 1347 | { |
| 1348 | struct sockaddr *sa = NULL; |
| 1349 | int error, sa_len; |
| 1350 | |
| 1351 | error = copyin(uap->alen, &sa_len, sizeof(sa_len)); |
| 1352 | if (error) |
| 1353 | return (error); |
| 1354 | |
| 1355 | error = kern_getpeername(uap->fdes, &sa, &sa_len); |
| 1356 | |
| 1357 | if (error == 0) |
| 1358 | error = copyout(sa, uap->asa, sa_len); |
| 1359 | if (error == 0) |
| 1360 | error = copyout(&sa_len, uap->alen, sizeof(*uap->alen)); |
| 1361 | if (sa) |
| 1362 | FREE(sa, M_SONAME); |
| 1363 | return (error); |
| 1364 | } |
| 1365 | |
| 1366 | int |
| 1367 | getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len) |
| 1368 | { |
| 1369 | struct sockaddr *sa; |
| 1370 | int error; |
| 1371 | |
| 1372 | *namp = NULL; |
| 1373 | if (len > SOCK_MAXADDRLEN) |
| 1374 | return ENAMETOOLONG; |
| 1375 | if (len < offsetof(struct sockaddr, sa_data[0])) |
| 1376 | return EDOM; |
| 1377 | MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK); |
| 1378 | error = copyin(uaddr, sa, len); |
| 1379 | if (error) { |
| 1380 | FREE(sa, M_SONAME); |
| 1381 | } else { |
| 1382 | #if BYTE_ORDER != BIG_ENDIAN |
| 1383 | /* |
| 1384 | * The bind(), connect(), and sendto() syscalls were not |
| 1385 | * versioned for COMPAT_43. Thus, this check must stay. |
| 1386 | */ |
| 1387 | if (sa->sa_family == 0 && sa->sa_len < AF_MAX) |
| 1388 | sa->sa_family = sa->sa_len; |
| 1389 | #endif |
| 1390 | sa->sa_len = len; |
| 1391 | *namp = sa; |
| 1392 | } |
| 1393 | return error; |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * Detach a mapped page and release resources back to the system. |
| 1398 | * We must release our wiring and if the object is ripped out |
| 1399 | * from under the vm_page we become responsible for freeing the |
| 1400 | * page. |
| 1401 | * |
| 1402 | * MPSAFE |
| 1403 | */ |
| 1404 | static void |
| 1405 | sf_buf_mfree(void *arg) |
| 1406 | { |
| 1407 | struct sf_buf *sf = arg; |
| 1408 | vm_page_t m; |
| 1409 | |
| 1410 | m = sf_buf_page(sf); |
| 1411 | if (sf_buf_free(sf)) { |
| 1412 | /* sf invalid now */ |
| 1413 | vm_page_busy_wait(m, FALSE, "sockpgf"); |
| 1414 | vm_page_unwire(m, 0); |
| 1415 | vm_page_wakeup(m); |
| 1416 | if (m->wire_count == 0 && m->object == NULL) |
| 1417 | vm_page_try_to_free(m); |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | /* |
| 1422 | * sendfile(2). |
| 1423 | * int sendfile(int fd, int s, off_t offset, size_t nbytes, |
| 1424 | * struct sf_hdtr *hdtr, off_t *sbytes, int flags) |
| 1425 | * |
| 1426 | * Send a file specified by 'fd' and starting at 'offset' to a socket |
| 1427 | * specified by 's'. Send only 'nbytes' of the file or until EOF if |
| 1428 | * nbytes == 0. Optionally add a header and/or trailer to the socket |
| 1429 | * output. If specified, write the total number of bytes sent into *sbytes. |
| 1430 | * |
| 1431 | * In FreeBSD kern/uipc_syscalls.c,v 1.103, a bug was fixed that caused |
| 1432 | * the headers to count against the remaining bytes to be sent from |
| 1433 | * the file descriptor. We may wish to implement a compatibility syscall |
| 1434 | * in the future. |
| 1435 | * |
| 1436 | * MPALMOSTSAFE |
| 1437 | */ |
| 1438 | int |
| 1439 | sys_sendfile(struct sendfile_args *uap) |
| 1440 | { |
| 1441 | struct thread *td = curthread; |
| 1442 | struct proc *p = td->td_proc; |
| 1443 | struct file *fp; |
| 1444 | struct vnode *vp = NULL; |
| 1445 | struct sf_hdtr hdtr; |
| 1446 | struct iovec aiov[UIO_SMALLIOV], *iov = NULL; |
| 1447 | struct uio auio; |
| 1448 | struct mbuf *mheader = NULL; |
| 1449 | size_t hbytes = 0; |
| 1450 | size_t tbytes; |
| 1451 | off_t hdtr_size = 0; |
| 1452 | off_t sbytes; |
| 1453 | int error; |
| 1454 | |
| 1455 | KKASSERT(p); |
| 1456 | |
| 1457 | /* |
| 1458 | * Do argument checking. Must be a regular file in, stream |
| 1459 | * type and connected socket out, positive offset. |
| 1460 | */ |
| 1461 | fp = holdfp(p->p_fd, uap->fd, FREAD); |
| 1462 | if (fp == NULL) { |
| 1463 | return (EBADF); |
| 1464 | } |
| 1465 | if (fp->f_type != DTYPE_VNODE) { |
| 1466 | fdrop(fp); |
| 1467 | return (EINVAL); |
| 1468 | } |
| 1469 | vp = (struct vnode *)fp->f_data; |
| 1470 | vref(vp); |
| 1471 | fdrop(fp); |
| 1472 | |
| 1473 | /* |
| 1474 | * If specified, get the pointer to the sf_hdtr struct for |
| 1475 | * any headers/trailers. |
| 1476 | */ |
| 1477 | if (uap->hdtr) { |
| 1478 | error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); |
| 1479 | if (error) |
| 1480 | goto done; |
| 1481 | /* |
| 1482 | * Send any headers. |
| 1483 | */ |
| 1484 | if (hdtr.headers) { |
| 1485 | error = iovec_copyin(hdtr.headers, &iov, aiov, |
| 1486 | hdtr.hdr_cnt, &hbytes); |
| 1487 | if (error) |
| 1488 | goto done; |
| 1489 | auio.uio_iov = iov; |
| 1490 | auio.uio_iovcnt = hdtr.hdr_cnt; |
| 1491 | auio.uio_offset = 0; |
| 1492 | auio.uio_segflg = UIO_USERSPACE; |
| 1493 | auio.uio_rw = UIO_WRITE; |
| 1494 | auio.uio_td = td; |
| 1495 | auio.uio_resid = hbytes; |
| 1496 | |
| 1497 | mheader = m_uiomove(&auio); |
| 1498 | |
| 1499 | iovec_free(&iov, aiov); |
| 1500 | if (mheader == NULL) |
| 1501 | goto done; |
| 1502 | } |
| 1503 | } |
| 1504 | |
| 1505 | error = kern_sendfile(vp, uap->s, uap->offset, uap->nbytes, mheader, |
| 1506 | &sbytes, uap->flags); |
| 1507 | if (error) |
| 1508 | goto done; |
| 1509 | |
| 1510 | /* |
| 1511 | * Send trailers. Wimp out and use writev(2). |
| 1512 | */ |
| 1513 | if (uap->hdtr != NULL && hdtr.trailers != NULL) { |
| 1514 | error = iovec_copyin(hdtr.trailers, &iov, aiov, |
| 1515 | hdtr.trl_cnt, &auio.uio_resid); |
| 1516 | if (error) |
| 1517 | goto done; |
| 1518 | auio.uio_iov = iov; |
| 1519 | auio.uio_iovcnt = hdtr.trl_cnt; |
| 1520 | auio.uio_offset = 0; |
| 1521 | auio.uio_segflg = UIO_USERSPACE; |
| 1522 | auio.uio_rw = UIO_WRITE; |
| 1523 | auio.uio_td = td; |
| 1524 | |
| 1525 | error = kern_sendmsg(uap->s, NULL, &auio, NULL, 0, &tbytes); |
| 1526 | |
| 1527 | iovec_free(&iov, aiov); |
| 1528 | if (error) |
| 1529 | goto done; |
| 1530 | hdtr_size += tbytes; /* trailer bytes successfully sent */ |
| 1531 | } |
| 1532 | |
| 1533 | done: |
| 1534 | if (vp) |
| 1535 | vrele(vp); |
| 1536 | if (uap->sbytes != NULL) { |
| 1537 | sbytes += hdtr_size; |
| 1538 | copyout(&sbytes, uap->sbytes, sizeof(off_t)); |
| 1539 | } |
| 1540 | return (error); |
| 1541 | } |
| 1542 | |
| 1543 | int |
| 1544 | kern_sendfile(struct vnode *vp, int sfd, off_t offset, size_t nbytes, |
| 1545 | struct mbuf *mheader, off_t *sbytes, int flags) |
| 1546 | { |
| 1547 | struct thread *td = curthread; |
| 1548 | struct proc *p = td->td_proc; |
| 1549 | struct vm_object *obj; |
| 1550 | struct socket *so; |
| 1551 | struct file *fp; |
| 1552 | struct mbuf *m; |
| 1553 | struct sf_buf *sf; |
| 1554 | struct vm_page *pg; |
| 1555 | off_t off, xfsize; |
| 1556 | off_t hbytes = 0; |
| 1557 | int error = 0; |
| 1558 | |
| 1559 | if (vp->v_type != VREG) { |
| 1560 | error = EINVAL; |
| 1561 | goto done0; |
| 1562 | } |
| 1563 | if ((obj = vp->v_object) == NULL) { |
| 1564 | error = EINVAL; |
| 1565 | goto done0; |
| 1566 | } |
| 1567 | error = holdsock(p->p_fd, sfd, &fp); |
| 1568 | if (error) |
| 1569 | goto done0; |
| 1570 | so = (struct socket *)fp->f_data; |
| 1571 | if (so->so_type != SOCK_STREAM) { |
| 1572 | error = EINVAL; |
| 1573 | goto done; |
| 1574 | } |
| 1575 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 1576 | error = ENOTCONN; |
| 1577 | goto done; |
| 1578 | } |
| 1579 | if (offset < 0) { |
| 1580 | error = EINVAL; |
| 1581 | goto done; |
| 1582 | } |
| 1583 | |
| 1584 | *sbytes = 0; |
| 1585 | /* |
| 1586 | * Protect against multiple writers to the socket. |
| 1587 | */ |
| 1588 | ssb_lock(&so->so_snd, M_WAITOK); |
| 1589 | |
| 1590 | /* |
| 1591 | * Loop through the pages in the file, starting with the requested |
| 1592 | * offset. Get a file page (do I/O if necessary), map the file page |
| 1593 | * into an sf_buf, attach an mbuf header to the sf_buf, and queue |
| 1594 | * it on the socket. |
| 1595 | */ |
| 1596 | for (off = offset; ; off += xfsize, *sbytes += xfsize + hbytes) { |
| 1597 | vm_pindex_t pindex; |
| 1598 | vm_offset_t pgoff; |
| 1599 | |
| 1600 | pindex = OFF_TO_IDX(off); |
| 1601 | retry_lookup: |
| 1602 | /* |
| 1603 | * Calculate the amount to transfer. Not to exceed a page, |
| 1604 | * the EOF, or the passed in nbytes. |
| 1605 | */ |
| 1606 | xfsize = vp->v_filesize - off; |
| 1607 | if (xfsize > PAGE_SIZE) |
| 1608 | xfsize = PAGE_SIZE; |
| 1609 | pgoff = (vm_offset_t)(off & PAGE_MASK); |
| 1610 | if (PAGE_SIZE - pgoff < xfsize) |
| 1611 | xfsize = PAGE_SIZE - pgoff; |
| 1612 | if (nbytes && xfsize > (nbytes - *sbytes)) |
| 1613 | xfsize = nbytes - *sbytes; |
| 1614 | if (xfsize <= 0) |
| 1615 | break; |
| 1616 | /* |
| 1617 | * Optimize the non-blocking case by looking at the socket space |
| 1618 | * before going to the extra work of constituting the sf_buf. |
| 1619 | */ |
| 1620 | if ((fp->f_flag & FNONBLOCK) && ssb_space(&so->so_snd) <= 0) { |
| 1621 | if (so->so_state & SS_CANTSENDMORE) |
| 1622 | error = EPIPE; |
| 1623 | else |
| 1624 | error = EAGAIN; |
| 1625 | ssb_unlock(&so->so_snd); |
| 1626 | goto done; |
| 1627 | } |
| 1628 | /* |
| 1629 | * Attempt to look up the page. |
| 1630 | * |
| 1631 | * Allocate if not found, wait and loop if busy, then |
| 1632 | * wire the page. critical section protection is |
| 1633 | * required to maintain the object association (an |
| 1634 | * interrupt can free the page) through to the |
| 1635 | * vm_page_wire() call. |
| 1636 | */ |
| 1637 | vm_object_hold(obj); |
| 1638 | pg = vm_page_lookup_busy_try(obj, pindex, TRUE, &error); |
| 1639 | if (error) { |
| 1640 | vm_page_sleep_busy(pg, TRUE, "sfpbsy"); |
| 1641 | vm_object_drop(obj); |
| 1642 | goto retry_lookup; |
| 1643 | } |
| 1644 | if (pg == NULL) { |
| 1645 | pg = vm_page_alloc(obj, pindex, VM_ALLOC_NORMAL | |
| 1646 | VM_ALLOC_NULL_OK); |
| 1647 | if (pg == NULL) { |
| 1648 | vm_wait(0); |
| 1649 | vm_object_drop(obj); |
| 1650 | goto retry_lookup; |
| 1651 | } |
| 1652 | } |
| 1653 | vm_page_wire(pg); |
| 1654 | vm_object_drop(obj); |
| 1655 | |
| 1656 | /* |
| 1657 | * If page is not valid for what we need, initiate I/O |
| 1658 | */ |
| 1659 | |
| 1660 | if (!pg->valid || !vm_page_is_valid(pg, pgoff, xfsize)) { |
| 1661 | struct uio auio; |
| 1662 | struct iovec aiov; |
| 1663 | int bsize; |
| 1664 | |
| 1665 | /* |
| 1666 | * Ensure that our page is still around when the I/O |
| 1667 | * completes. |
| 1668 | */ |
| 1669 | vm_page_io_start(pg); |
| 1670 | vm_page_wakeup(pg); |
| 1671 | |
| 1672 | /* |
| 1673 | * Get the page from backing store. |
| 1674 | */ |
| 1675 | bsize = vp->v_mount->mnt_stat.f_iosize; |
| 1676 | auio.uio_iov = &aiov; |
| 1677 | auio.uio_iovcnt = 1; |
| 1678 | aiov.iov_base = 0; |
| 1679 | aiov.iov_len = MAXBSIZE; |
| 1680 | auio.uio_resid = MAXBSIZE; |
| 1681 | auio.uio_offset = trunc_page(off); |
| 1682 | auio.uio_segflg = UIO_NOCOPY; |
| 1683 | auio.uio_rw = UIO_READ; |
| 1684 | auio.uio_td = td; |
| 1685 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 1686 | error = VOP_READ(vp, &auio, |
| 1687 | IO_VMIO | ((MAXBSIZE / bsize) << 16), |
| 1688 | td->td_ucred); |
| 1689 | vn_unlock(vp); |
| 1690 | vm_page_flag_clear(pg, PG_ZERO); |
| 1691 | vm_page_busy_wait(pg, FALSE, "sockpg"); |
| 1692 | vm_page_io_finish(pg); |
| 1693 | if (error) { |
| 1694 | vm_page_unwire(pg, 0); |
| 1695 | vm_page_wakeup(pg); |
| 1696 | vm_page_try_to_free(pg); |
| 1697 | ssb_unlock(&so->so_snd); |
| 1698 | goto done; |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | |
| 1703 | /* |
| 1704 | * Get a sendfile buf. We usually wait as long as necessary, |
| 1705 | * but this wait can be interrupted. |
| 1706 | */ |
| 1707 | if ((sf = sf_buf_alloc(pg)) == NULL) { |
| 1708 | vm_page_unwire(pg, 0); |
| 1709 | vm_page_wakeup(pg); |
| 1710 | vm_page_try_to_free(pg); |
| 1711 | ssb_unlock(&so->so_snd); |
| 1712 | error = EINTR; |
| 1713 | goto done; |
| 1714 | } |
| 1715 | vm_page_wakeup(pg); |
| 1716 | |
| 1717 | /* |
| 1718 | * Get an mbuf header and set it up as having external storage. |
| 1719 | */ |
| 1720 | MGETHDR(m, MB_WAIT, MT_DATA); |
| 1721 | if (m == NULL) { |
| 1722 | error = ENOBUFS; |
| 1723 | sf_buf_free(sf); |
| 1724 | ssb_unlock(&so->so_snd); |
| 1725 | goto done; |
| 1726 | } |
| 1727 | |
| 1728 | m->m_ext.ext_free = sf_buf_mfree; |
| 1729 | m->m_ext.ext_ref = sf_buf_ref; |
| 1730 | m->m_ext.ext_arg = sf; |
| 1731 | m->m_ext.ext_buf = (void *)sf_buf_kva(sf); |
| 1732 | m->m_ext.ext_size = PAGE_SIZE; |
| 1733 | m->m_data = (char *)sf_buf_kva(sf) + pgoff; |
| 1734 | m->m_flags |= M_EXT; |
| 1735 | m->m_pkthdr.len = m->m_len = xfsize; |
| 1736 | KKASSERT((m->m_flags & (M_EXT_CLUSTER)) == 0); |
| 1737 | |
| 1738 | if (mheader != NULL) { |
| 1739 | hbytes = mheader->m_pkthdr.len; |
| 1740 | mheader->m_pkthdr.len += m->m_pkthdr.len; |
| 1741 | m_cat(mheader, m); |
| 1742 | m = mheader; |
| 1743 | mheader = NULL; |
| 1744 | } else |
| 1745 | hbytes = 0; |
| 1746 | |
| 1747 | /* |
| 1748 | * Add the buffer to the socket buffer chain. |
| 1749 | */ |
| 1750 | crit_enter(); |
| 1751 | retry_space: |
| 1752 | /* |
| 1753 | * Make sure that the socket is still able to take more data. |
| 1754 | * CANTSENDMORE being true usually means that the connection |
| 1755 | * was closed. so_error is true when an error was sensed after |
| 1756 | * a previous send. |
| 1757 | * The state is checked after the page mapping and buffer |
| 1758 | * allocation above since those operations may block and make |
| 1759 | * any socket checks stale. From this point forward, nothing |
| 1760 | * blocks before the pru_send (or more accurately, any blocking |
| 1761 | * results in a loop back to here to re-check). |
| 1762 | */ |
| 1763 | if ((so->so_state & SS_CANTSENDMORE) || so->so_error) { |
| 1764 | if (so->so_state & SS_CANTSENDMORE) { |
| 1765 | error = EPIPE; |
| 1766 | } else { |
| 1767 | error = so->so_error; |
| 1768 | so->so_error = 0; |
| 1769 | } |
| 1770 | m_freem(m); |
| 1771 | ssb_unlock(&so->so_snd); |
| 1772 | crit_exit(); |
| 1773 | goto done; |
| 1774 | } |
| 1775 | /* |
| 1776 | * Wait for socket space to become available. We do this just |
| 1777 | * after checking the connection state above in order to avoid |
| 1778 | * a race condition with ssb_wait(). |
| 1779 | */ |
| 1780 | if (ssb_space(&so->so_snd) < so->so_snd.ssb_lowat) { |
| 1781 | if (fp->f_flag & FNONBLOCK) { |
| 1782 | m_freem(m); |
| 1783 | ssb_unlock(&so->so_snd); |
| 1784 | crit_exit(); |
| 1785 | error = EAGAIN; |
| 1786 | goto done; |
| 1787 | } |
| 1788 | error = ssb_wait(&so->so_snd); |
| 1789 | /* |
| 1790 | * An error from ssb_wait usually indicates that we've |
| 1791 | * been interrupted by a signal. If we've sent anything |
| 1792 | * then return bytes sent, otherwise return the error. |
| 1793 | */ |
| 1794 | if (error) { |
| 1795 | m_freem(m); |
| 1796 | ssb_unlock(&so->so_snd); |
| 1797 | crit_exit(); |
| 1798 | goto done; |
| 1799 | } |
| 1800 | goto retry_space; |
| 1801 | } |
| 1802 | error = so_pru_senda(so, 0, m, NULL, NULL, td); |
| 1803 | crit_exit(); |
| 1804 | if (error) { |
| 1805 | ssb_unlock(&so->so_snd); |
| 1806 | goto done; |
| 1807 | } |
| 1808 | } |
| 1809 | if (mheader != NULL) { |
| 1810 | *sbytes += mheader->m_pkthdr.len; |
| 1811 | error = so_pru_senda(so, 0, mheader, NULL, NULL, td); |
| 1812 | mheader = NULL; |
| 1813 | } |
| 1814 | ssb_unlock(&so->so_snd); |
| 1815 | |
| 1816 | done: |
| 1817 | fdrop(fp); |
| 1818 | done0: |
| 1819 | if (mheader != NULL) |
| 1820 | m_freem(mheader); |
| 1821 | return (error); |
| 1822 | } |
| 1823 | |
| 1824 | /* |
| 1825 | * MPALMOSTSAFE |
| 1826 | */ |
| 1827 | int |
| 1828 | sys_sctp_peeloff(struct sctp_peeloff_args *uap) |
| 1829 | { |
| 1830 | #ifdef SCTP |
| 1831 | struct thread *td = curthread; |
| 1832 | struct filedesc *fdp = td->td_proc->p_fd; |
| 1833 | struct file *lfp = NULL; |
| 1834 | struct file *nfp = NULL; |
| 1835 | int error; |
| 1836 | struct socket *head, *so; |
| 1837 | caddr_t assoc_id; |
| 1838 | int fd; |
| 1839 | short fflag; /* type must match fp->f_flag */ |
| 1840 | |
| 1841 | assoc_id = uap->name; |
| 1842 | error = holdsock(td->td_proc->p_fd, uap->sd, &lfp); |
| 1843 | if (error) |
| 1844 | return (error); |
| 1845 | |
| 1846 | crit_enter(); |
| 1847 | head = (struct socket *)lfp->f_data; |
| 1848 | error = sctp_can_peel_off(head, assoc_id); |
| 1849 | if (error) { |
| 1850 | crit_exit(); |
| 1851 | goto done; |
| 1852 | } |
| 1853 | /* |
| 1854 | * At this point we know we do have a assoc to pull |
| 1855 | * we proceed to get the fd setup. This may block |
| 1856 | * but that is ok. |
| 1857 | */ |
| 1858 | |
| 1859 | fflag = lfp->f_flag; |
| 1860 | error = falloc(td->td_lwp, &nfp, &fd); |
| 1861 | if (error) { |
| 1862 | /* |
| 1863 | * Probably ran out of file descriptors. Put the |
| 1864 | * unaccepted connection back onto the queue and |
| 1865 | * do another wakeup so some other process might |
| 1866 | * have a chance at it. |
| 1867 | */ |
| 1868 | crit_exit(); |
| 1869 | goto done; |
| 1870 | } |
| 1871 | uap->sysmsg_iresult = fd; |
| 1872 | |
| 1873 | so = sctp_get_peeloff(head, assoc_id, &error); |
| 1874 | if (so == NULL) { |
| 1875 | /* |
| 1876 | * Either someone else peeled it off OR |
| 1877 | * we can't get a socket. |
| 1878 | */ |
| 1879 | goto noconnection; |
| 1880 | } |
| 1881 | soreference(so); /* reference needed */ |
| 1882 | soclrstate(so, SS_NOFDREF | SS_COMP); /* when clearing NOFDREF */ |
| 1883 | so->so_head = NULL; |
| 1884 | if (head->so_sigio != NULL) |
| 1885 | fsetown(fgetown(&head->so_sigio), &so->so_sigio); |
| 1886 | |
| 1887 | nfp->f_type = DTYPE_SOCKET; |
| 1888 | nfp->f_flag = fflag; |
| 1889 | nfp->f_ops = &socketops; |
| 1890 | nfp->f_data = so; |
| 1891 | |
| 1892 | noconnection: |
| 1893 | /* |
| 1894 | * Assign the file pointer to the reserved descriptor, or clear |
| 1895 | * the reserved descriptor if an error occured. |
| 1896 | */ |
| 1897 | if (error) |
| 1898 | fsetfd(fdp, NULL, fd); |
| 1899 | else |
| 1900 | fsetfd(fdp, nfp, fd); |
| 1901 | crit_exit(); |
| 1902 | /* |
| 1903 | * Release explicitly held references before returning. |
| 1904 | */ |
| 1905 | done: |
| 1906 | if (nfp != NULL) |
| 1907 | fdrop(nfp); |
| 1908 | fdrop(lfp); |
| 1909 | return (error); |
| 1910 | #else /* SCTP */ |
| 1911 | return(EOPNOTSUPP); |
| 1912 | #endif /* SCTP */ |
| 1913 | } |