uipc_socket.c revision 1.6.2.2
1 /* 2 * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California. 3 * 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)uipc_socket.c 7.28 (Berkeley) 5/4/91 34 * $Id: uipc_socket.c,v 1.6.2.2 1993/11/06 00:07:55 mycroft Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/proc.h> 40 #include <sys/file.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/domain.h> 44 #include <sys/kernel.h> 45 #include <sys/select.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/resourcevar.h> 50 51 #include <machine/cpu.h> 52 53 /* 54 * Socket operation routines. 55 * These routines are called by the routines in 56 * sys_socket.c or from a system process, and 57 * implement the semantics of socket operations by 58 * switching out to the protocol specific routines. 59 */ 60 /*ARGSUSED*/ 61 int 62 socreate(dom, aso, type, proto) 63 struct socket **aso; 64 register int type; 65 int proto; 66 { 67 struct proc *p = curproc; /* XXX */ 68 register struct protosw *prp; 69 register struct socket *so; 70 register int error; 71 72 if (proto) 73 prp = pffindproto(dom, proto, type); 74 else 75 prp = pffindtype(dom, type); 76 if (!prp || !prp->pr_usrreq) 77 return (EPROTONOSUPPORT); 78 if (prp->pr_type != type) 79 return (EPROTOTYPE); 80 MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT); 81 bzero((caddr_t)so, sizeof(*so)); 82 so->so_type = type; 83 if (p->p_ucred->cr_uid == 0) 84 so->so_state = SS_PRIV; 85 so->so_proto = prp; 86 error = 87 (*prp->pr_usrreq)(so, PRU_ATTACH, 88 (struct mbuf *)0, (struct mbuf *)proto, (struct mbuf *)0); 89 if (error) { 90 so->so_state |= SS_NOFDREF; 91 sofree(so); 92 return (error); 93 } 94 *aso = so; 95 return (0); 96 } 97 98 int 99 sobind(so, nam) 100 struct socket *so; 101 struct mbuf *nam; 102 { 103 int s = splnet(); 104 int error; 105 106 error = 107 (*so->so_proto->pr_usrreq)(so, PRU_BIND, 108 (struct mbuf *)0, nam, (struct mbuf *)0); 109 splx(s); 110 return (error); 111 } 112 113 int 114 solisten(so, backlog) 115 register struct socket *so; 116 int backlog; 117 { 118 int s = splnet(), error; 119 120 error = 121 (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, 122 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 123 if (error) { 124 splx(s); 125 return (error); 126 } 127 if (so->so_q == 0) 128 so->so_options |= SO_ACCEPTCONN; 129 if (backlog < 0) 130 backlog = 0; 131 so->so_qlimit = min(backlog, SOMAXCONN); 132 splx(s); 133 return (0); 134 } 135 136 int 137 sofree(so) 138 register struct socket *so; 139 { 140 141 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 142 return; 143 if (so->so_head) { 144 if (!soqremque(so, 0) && !soqremque(so, 1)) 145 panic("sofree dq"); 146 so->so_head = 0; 147 } 148 sbrelease(&so->so_snd); 149 sorflush(so); 150 FREE(so, M_SOCKET); 151 } 152 153 /* 154 * Close a socket on last file table reference removal. 155 * Initiate disconnect if connected. 156 * Free socket when disconnect complete. 157 */ 158 int 159 soclose(so) 160 register struct socket *so; 161 { 162 int s = splnet(); /* conservative */ 163 int error = 0; 164 165 if (so->so_options & SO_ACCEPTCONN) { 166 while (so->so_q0) 167 (void) soabort(so->so_q0); 168 while (so->so_q) 169 (void) soabort(so->so_q); 170 } 171 if (so->so_pcb == 0) 172 goto discard; 173 if (so->so_state & SS_ISCONNECTED) { 174 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 175 error = sodisconnect(so); 176 if (error) 177 goto drop; 178 } 179 if (so->so_options & SO_LINGER) { 180 if ((so->so_state & SS_ISDISCONNECTING) && 181 (so->so_state & SS_NBIO)) 182 goto drop; 183 while (so->so_state & SS_ISCONNECTED) 184 if (error = tsleep((caddr_t)&so->so_timeo, 185 PSOCK | PCATCH, netcls, so->so_linger)) 186 break; 187 } 188 } 189 drop: 190 if (so->so_pcb) { 191 int error2 = 192 (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 193 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 194 if (error == 0) 195 error = error2; 196 } 197 discard: 198 if (so->so_state & SS_NOFDREF) 199 panic("soclose: NOFDREF"); 200 so->so_state |= SS_NOFDREF; 201 sofree(so); 202 splx(s); 203 return (error); 204 } 205 206 /* 207 * Must be called at splnet... 208 */ 209 int 210 soabort(so) 211 struct socket *so; 212 { 213 214 return ( 215 (*so->so_proto->pr_usrreq)(so, PRU_ABORT, 216 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 217 } 218 219 int 220 soaccept(so, nam) 221 register struct socket *so; 222 struct mbuf *nam; 223 { 224 int s = splnet(); 225 int error; 226 227 if ((so->so_state & SS_NOFDREF) == 0) 228 panic("soaccept: !NOFDREF"); 229 so->so_state &= ~SS_NOFDREF; 230 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 231 (struct mbuf *)0, nam, (struct mbuf *)0); 232 splx(s); 233 return (error); 234 } 235 236 int 237 soconnect(so, nam) 238 register struct socket *so; 239 struct mbuf *nam; 240 { 241 int s; 242 int error; 243 244 if (so->so_options & SO_ACCEPTCONN) 245 return (EOPNOTSUPP); 246 s = splnet(); 247 /* 248 * If protocol is connection-based, can only connect once. 249 * Otherwise, if connected, try to disconnect first. 250 * This allows user to disconnect by connecting to, e.g., 251 * a null address. 252 */ 253 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 254 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 255 (error = sodisconnect(so)))) 256 error = EISCONN; 257 else 258 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 259 (struct mbuf *)0, nam, (struct mbuf *)0); 260 splx(s); 261 return (error); 262 } 263 264 int 265 soconnect2(so1, so2) 266 register struct socket *so1; 267 struct socket *so2; 268 { 269 int s = splnet(); 270 int error; 271 272 error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, 273 (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0); 274 splx(s); 275 return (error); 276 } 277 278 int 279 sodisconnect(so) 280 register struct socket *so; 281 { 282 int s = splnet(); 283 int error; 284 285 if ((so->so_state & SS_ISCONNECTED) == 0) { 286 error = ENOTCONN; 287 goto bad; 288 } 289 if (so->so_state & SS_ISDISCONNECTING) { 290 error = EALREADY; 291 goto bad; 292 } 293 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 294 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 295 bad: 296 splx(s); 297 return (error); 298 } 299 300 /* 301 * Send on a socket. 302 * If send must go all at once and message is larger than 303 * send buffering, then hard error. 304 * Lock against other senders. 305 * If must go all at once and not enough room now, then 306 * inform user that this would block and do nothing. 307 * Otherwise, if nonblocking, send as much as possible. 308 * The data to be sent is described by "uio" if nonzero, 309 * otherwise by the mbuf chain "top" (which must be null 310 * if uio is not). Data provided in mbuf chain must be small 311 * enough to send all at once. 312 * 313 * Returns nonzero on error, timeout or signal; callers 314 * must check for short counts if EINTR/ERESTART are returned. 315 * Data and control buffers are freed on return. 316 */ 317 int 318 sosend(so, addr, uio, top, control, flags) 319 register struct socket *so; 320 struct mbuf *addr; 321 struct uio *uio; 322 struct mbuf *top; 323 struct mbuf *control; 324 int flags; 325 { 326 struct proc *p = curproc; /* XXX */ 327 struct mbuf **mp; 328 register struct mbuf *m; 329 register long space, len, resid; 330 int clen = 0, error, s, dontroute, mlen; 331 int atomic = sosendallatonce(so) || top; 332 333 if (uio) 334 resid = uio->uio_resid; 335 else 336 resid = top->m_pkthdr.len; 337 /* 338 * In theory resid should be unsigned. 339 * However, space must be signed, as it might be less than 0 340 * if we over-committed, and we must use a signed comparison 341 * of space and resid. On the other hand, a negative resid 342 * causes us to loop sending 0-length segments to the protocol. 343 */ 344 if (resid < 0) 345 return (EINVAL); 346 dontroute = 347 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 348 (so->so_proto->pr_flags & PR_ATOMIC); 349 p->p_stats->p_ru.ru_msgsnd++; 350 if (control) 351 clen = control->m_len; 352 #define snderr(errno) { error = errno; splx(s); goto release; } 353 354 restart: 355 if (error = sblock(&so->so_snd)) 356 goto out; 357 do { 358 s = splnet(); 359 if (so->so_state & SS_CANTSENDMORE) 360 snderr(EPIPE); 361 if (so->so_error) 362 snderr(so->so_error); 363 if ((so->so_state & SS_ISCONNECTED) == 0) { 364 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 365 if ((so->so_state & SS_ISCONFIRMING) == 0 && 366 !(resid == 0 && clen != 0)) 367 snderr(ENOTCONN); 368 } else if (addr == 0) 369 snderr(EDESTADDRREQ); 370 } 371 space = sbspace(&so->so_snd); 372 if (flags & MSG_OOB) 373 space += 1024; 374 if (space < resid + clen && 375 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 376 if (atomic && resid > so->so_snd.sb_hiwat || 377 clen > so->so_snd.sb_hiwat) 378 snderr(EMSGSIZE); 379 if (so->so_state & SS_NBIO) 380 snderr(EWOULDBLOCK); 381 sbunlock(&so->so_snd); 382 error = sbwait(&so->so_snd); 383 splx(s); 384 if (error) 385 goto out; 386 goto restart; 387 } 388 splx(s); 389 mp = ⊤ 390 space -= clen; 391 do { 392 if (uio == NULL) { 393 /* 394 * Data is prepackaged in "top". 395 */ 396 resid = 0; 397 if (flags & MSG_EOR) 398 top->m_flags |= M_EOR; 399 } else do { 400 if (top == 0) { 401 MGETHDR(m, M_WAIT, MT_DATA); 402 mlen = MHLEN; 403 m->m_pkthdr.len = 0; 404 m->m_pkthdr.rcvif = (struct ifnet *)0; 405 } else { 406 MGET(m, M_WAIT, MT_DATA); 407 mlen = MLEN; 408 } 409 if (resid >= MINCLSIZE) { 410 MCLGET(m, M_WAIT); 411 if ((m->m_flags & M_EXT) == 0) 412 goto nopages; 413 mlen = MCLBYTES; 414 len = min(min(mlen, resid), space); 415 } else { 416 nopages: 417 len = min(min(mlen, resid), space); 418 /* 419 * For datagram protocols, leave room 420 * for protocol headers in first mbuf. 421 */ 422 if (atomic && top == 0 && len < mlen) 423 MH_ALIGN(m, len); 424 } 425 space -= len; 426 error = uiomove(mtod(m, caddr_t), (int)len, uio); 427 resid = uio->uio_resid; 428 m->m_len = len; 429 *mp = m; 430 top->m_pkthdr.len += len; 431 if (error) 432 goto release; 433 mp = &m->m_next; 434 if (resid <= 0) { 435 if (flags & MSG_EOR) 436 top->m_flags |= M_EOR; 437 break; 438 } 439 } while (space > 0 && atomic); 440 if (dontroute) 441 so->so_options |= SO_DONTROUTE; 442 s = splnet(); /* XXX */ 443 error = (*so->so_proto->pr_usrreq)(so, 444 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 445 top, addr, control); 446 splx(s); 447 if (dontroute) 448 so->so_options &= ~SO_DONTROUTE; 449 clen = 0; 450 control = 0; 451 top = 0; 452 mp = ⊤ 453 if (error) 454 goto release; 455 } while (resid && space > 0); 456 } while (resid); 457 458 release: 459 sbunlock(&so->so_snd); 460 out: 461 if (top) 462 m_freem(top); 463 if (control) 464 m_freem(control); 465 return (error); 466 } 467 468 /* 469 * Implement receive operations on a socket. 470 * We depend on the way that records are added to the sockbuf 471 * by sbappend*. In particular, each record (mbufs linked through m_next) 472 * must begin with an address if the protocol so specifies, 473 * followed by an optional mbuf or mbufs containing ancillary data, 474 * and then zero or more mbufs of data. 475 * In order to avoid blocking network interrupts for the entire time here, 476 * we splx() while doing the actual copy to user space. 477 * Although the sockbuf is locked, new data may still be appended, 478 * and thus we must maintain consistency of the sockbuf during that time. 479 * 480 * The caller may receive the data as a single mbuf chain by supplying 481 * an mbuf **mp0 for use in returning the chain. The uio is then used 482 * only for the count in uio_resid. 483 */ 484 int 485 soreceive(so, paddr, uio, mp0, controlp, flagsp) 486 register struct socket *so; 487 struct mbuf **paddr; 488 struct uio *uio; 489 struct mbuf **mp0; 490 struct mbuf **controlp; 491 int *flagsp; 492 { 493 struct proc *p = curproc; /* XXX */ 494 register struct mbuf *m, **mp; 495 register int flags, len, error, s, offset; 496 struct protosw *pr = so->so_proto; 497 struct mbuf *nextrecord; 498 int moff, type; 499 int orig_resid = uio->uio_resid; 500 501 mp = mp0; 502 if (paddr) 503 *paddr = 0; 504 if (controlp) 505 *controlp = 0; 506 if (flagsp) 507 flags = *flagsp &~ MSG_EOR; 508 else 509 flags = 0; 510 if (flags & MSG_OOB) { 511 m = m_get(M_WAIT, MT_DATA); 512 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 513 m, (struct mbuf *)(flags & MSG_PEEK), (struct mbuf *)0); 514 if (error) 515 goto bad; 516 do { 517 error = uiomove(mtod(m, caddr_t), 518 (int) min(uio->uio_resid, m->m_len), uio); 519 m = m_free(m); 520 } while (uio->uio_resid && error == 0 && m); 521 bad: 522 if (m) 523 m_freem(m); 524 return (error); 525 } 526 if (mp) 527 *mp = (struct mbuf *)0; 528 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 529 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 530 (struct mbuf *)0, (struct mbuf *)0); 531 532 restart: 533 if (error = sblock(&so->so_rcv)) 534 return (error); 535 s = splnet(); 536 537 m = so->so_rcv.sb_mb; 538 /* 539 * If we have less data than requested, block awaiting more 540 * (subject to any timeout) if: 541 * 1. the current count is less than the low water mark, or 542 * 2. MSG_WAITALL is set, and it is possible to do the entire 543 * receive operation at once if we block (resid <= hiwat). 544 * If MSG_WAITALL is set but resid is larger than the receive buffer, 545 * we have to do the receive in sections, and thus risk returning 546 * a short count if a timeout or signal occurs after we start. 547 */ 548 while (m == 0 || so->so_rcv.sb_cc < uio->uio_resid && 549 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 550 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 551 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0) { 552 #ifdef DIAGNOSTIC 553 if (m == 0 && so->so_rcv.sb_cc) 554 panic("receive 1"); 555 #endif 556 if (so->so_error) { 557 if (m) 558 break; 559 error = so->so_error; 560 if ((flags & MSG_PEEK) == 0) 561 so->so_error = 0; 562 goto release; 563 } 564 if (so->so_state & SS_CANTRCVMORE) { 565 if (m) 566 break; 567 else 568 goto release; 569 } 570 for (; m; m = m->m_next) 571 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 572 m = so->so_rcv.sb_mb; 573 goto dontblock; 574 } 575 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 576 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 577 error = ENOTCONN; 578 goto release; 579 } 580 if (uio->uio_resid == 0) 581 goto release; 582 if (so->so_state & SS_NBIO) { 583 error = EWOULDBLOCK; 584 goto release; 585 } 586 sbunlock(&so->so_rcv); 587 error = sbwait(&so->so_rcv); 588 splx(s); 589 if (error) 590 return (error); 591 goto restart; 592 } 593 dontblock: 594 p->p_stats->p_ru.ru_msgrcv++; 595 nextrecord = m->m_nextpkt; 596 if (pr->pr_flags & PR_ADDR) { 597 #ifdef DIAGNOSTIC 598 if (m->m_type != MT_SONAME) 599 panic("receive 1a"); 600 #endif 601 orig_resid = 0; 602 if (flags & MSG_PEEK) { 603 if (paddr) 604 *paddr = m_copy(m, 0, m->m_len); 605 m = m->m_next; 606 } else { 607 sbfree(&so->so_rcv, m); 608 if (paddr) { 609 *paddr = m; 610 so->so_rcv.sb_mb = m->m_next; 611 m->m_next = 0; 612 m = so->so_rcv.sb_mb; 613 } else { 614 MFREE(m, so->so_rcv.sb_mb); 615 m = so->so_rcv.sb_mb; 616 } 617 } 618 } 619 while (m && m->m_type == MT_CONTROL && error == 0) { 620 if (flags & MSG_PEEK) { 621 if (controlp) 622 *controlp = m_copy(m, 0, m->m_len); 623 m = m->m_next; 624 } else { 625 sbfree(&so->so_rcv, m); 626 if (controlp) { 627 if (pr->pr_domain->dom_externalize && 628 mtod(m, struct cmsghdr *)->cmsg_type == 629 SCM_RIGHTS) 630 error = (*pr->pr_domain->dom_externalize)(m); 631 *controlp = m; 632 so->so_rcv.sb_mb = m->m_next; 633 m->m_next = 0; 634 m = so->so_rcv.sb_mb; 635 } else { 636 MFREE(m, so->so_rcv.sb_mb); 637 m = so->so_rcv.sb_mb; 638 } 639 } 640 if (controlp) { 641 orig_resid = 0; 642 controlp = &(*controlp)->m_next; 643 } 644 } 645 if (m) { 646 if ((flags & MSG_PEEK) == 0) 647 m->m_nextpkt = nextrecord; 648 type = m->m_type; 649 if (type == MT_OOBDATA) 650 flags |= MSG_OOB; 651 } 652 moff = 0; 653 offset = 0; 654 while (m && uio->uio_resid > 0 && error == 0) { 655 if (m->m_type == MT_OOBDATA) { 656 if (type != MT_OOBDATA) 657 break; 658 } else if (type == MT_OOBDATA) 659 break; 660 #ifdef DIAGNOSTIC 661 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 662 panic("receive 3"); 663 #endif 664 so->so_state &= ~SS_RCVATMARK; 665 len = uio->uio_resid; 666 if (so->so_oobmark && len > so->so_oobmark - offset) 667 len = so->so_oobmark - offset; 668 if (len > m->m_len - moff) 669 len = m->m_len - moff; 670 /* 671 * If mp is set, just pass back the mbufs. 672 * Otherwise copy them out via the uio, then free. 673 * Sockbuf must be consistent here (points to current mbuf, 674 * it points to next record) when we drop priority; 675 * we must note any additions to the sockbuf when we 676 * block interrupts again. 677 */ 678 if (mp == 0) { 679 splx(s); 680 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 681 s = splnet(); 682 } else 683 uio->uio_resid -= len; 684 if (len == m->m_len - moff) { 685 if (m->m_flags & M_EOR) 686 flags |= MSG_EOR; 687 if (flags & MSG_PEEK) { 688 m = m->m_next; 689 moff = 0; 690 } else { 691 nextrecord = m->m_nextpkt; 692 sbfree(&so->so_rcv, m); 693 if (mp) { 694 *mp = m; 695 mp = &m->m_next; 696 so->so_rcv.sb_mb = m = m->m_next; 697 *mp = (struct mbuf *)0; 698 } else { 699 MFREE(m, so->so_rcv.sb_mb); 700 m = so->so_rcv.sb_mb; 701 } 702 if (m) 703 m->m_nextpkt = nextrecord; 704 } 705 } else { 706 if (flags & MSG_PEEK) 707 moff += len; 708 else { 709 if (mp) 710 *mp = m_copym(m, 0, len, M_WAIT); 711 m->m_data += len; 712 m->m_len -= len; 713 so->so_rcv.sb_cc -= len; 714 } 715 } 716 if (so->so_oobmark) { 717 if ((flags & MSG_PEEK) == 0) { 718 so->so_oobmark -= len; 719 if (so->so_oobmark == 0) { 720 so->so_state |= SS_RCVATMARK; 721 break; 722 } 723 } else { 724 offset += len; 725 if (offset == so->so_oobmark) 726 break; 727 } 728 } 729 if (flags & MSG_EOR) 730 break; 731 /* 732 * If the MSG_WAITALL flag is set (for non-atomic socket), 733 * we must not quit until "uio->uio_resid == 0" or an error 734 * termination. If a signal/timeout occurs, return 735 * with a short count but without error. 736 * Keep sockbuf locked against other readers. 737 */ 738 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 739 !sosendallatonce(so) && !nextrecord) { 740 if (so->so_error || so->so_state & SS_CANTRCVMORE) 741 break; 742 error = sbwait(&so->so_rcv); 743 if (error) { 744 sbunlock(&so->so_rcv); 745 splx(s); 746 return (0); 747 } 748 if (m = so->so_rcv.sb_mb) 749 nextrecord = m->m_nextpkt; 750 } 751 } 752 753 if (m && pr->pr_flags & PR_ATOMIC) { 754 flags |= MSG_TRUNC; 755 if ((flags & MSG_PEEK) == 0) 756 (void) sbdroprecord(&so->so_rcv); 757 } 758 if ((flags & MSG_PEEK) == 0) { 759 if (m == 0) 760 so->so_rcv.sb_mb = nextrecord; 761 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 762 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 763 (struct mbuf *)flags, (struct mbuf *)0, 764 (struct mbuf *)0); 765 } 766 if (orig_resid == uio->uio_resid && orig_resid && 767 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 768 sbunlock(&so->so_rcv); 769 splx(s); 770 goto restart; 771 } 772 773 if (flagsp) 774 *flagsp |= flags; 775 release: 776 sbunlock(&so->so_rcv); 777 splx(s); 778 return (error); 779 } 780 781 soshutdown(so, how) 782 register struct socket *so; 783 register int how; 784 { 785 register struct protosw *pr = so->so_proto; 786 787 how++; 788 if (how & FREAD) 789 sorflush(so); 790 if (how & FWRITE) 791 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 792 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 793 return (0); 794 } 795 796 sorflush(so) 797 register struct socket *so; 798 { 799 register struct sockbuf *sb = &so->so_rcv; 800 register struct protosw *pr = so->so_proto; 801 register int s; 802 struct sockbuf asb; 803 804 sb->sb_flags |= SB_NOINTR; 805 (void) sblock(sb); 806 s = splimp(); 807 socantrcvmore(so); 808 sbunlock(sb); 809 asb = *sb; 810 bzero((caddr_t)sb, sizeof (*sb)); 811 splx(s); 812 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 813 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 814 sbrelease(&asb); 815 } 816 817 sosetopt(so, level, optname, m0) 818 register struct socket *so; 819 int level, optname; 820 struct mbuf *m0; 821 { 822 int error = 0; 823 register struct mbuf *m = m0; 824 825 if (level != SOL_SOCKET) { 826 if (so->so_proto && so->so_proto->pr_ctloutput) 827 return ((*so->so_proto->pr_ctloutput) 828 (PRCO_SETOPT, so, level, optname, &m0)); 829 error = ENOPROTOOPT; 830 } else { 831 switch (optname) { 832 833 case SO_LINGER: 834 if (m == NULL || m->m_len != sizeof (struct linger)) { 835 error = EINVAL; 836 goto bad; 837 } 838 so->so_linger = mtod(m, struct linger *)->l_linger; 839 /* fall thru... */ 840 841 case SO_DEBUG: 842 case SO_KEEPALIVE: 843 case SO_DONTROUTE: 844 case SO_USELOOPBACK: 845 case SO_BROADCAST: 846 case SO_REUSEADDR: 847 case SO_OOBINLINE: 848 if (m == NULL || m->m_len < sizeof (int)) { 849 error = EINVAL; 850 goto bad; 851 } 852 if (*mtod(m, int *)) 853 so->so_options |= optname; 854 else 855 so->so_options &= ~optname; 856 break; 857 858 case SO_SNDBUF: 859 case SO_RCVBUF: 860 case SO_SNDLOWAT: 861 case SO_RCVLOWAT: 862 if (m == NULL || m->m_len < sizeof (int)) { 863 error = EINVAL; 864 goto bad; 865 } 866 switch (optname) { 867 868 case SO_SNDBUF: 869 case SO_RCVBUF: 870 if (sbreserve(optname == SO_SNDBUF ? 871 &so->so_snd : &so->so_rcv, 872 (u_long) *mtod(m, int *)) == 0) { 873 error = ENOBUFS; 874 goto bad; 875 } 876 break; 877 878 case SO_SNDLOWAT: 879 so->so_snd.sb_lowat = *mtod(m, int *); 880 break; 881 case SO_RCVLOWAT: 882 so->so_rcv.sb_lowat = *mtod(m, int *); 883 break; 884 } 885 break; 886 887 case SO_SNDTIMEO: 888 case SO_RCVTIMEO: 889 { 890 struct timeval *tv; 891 short val; 892 893 if (m == NULL || m->m_len < sizeof (*tv)) { 894 error = EINVAL; 895 goto bad; 896 } 897 tv = mtod(m, struct timeval *); 898 if (tv->tv_sec > SHRT_MAX / hz - hz) { 899 error = EDOM; 900 goto bad; 901 } 902 val = tv->tv_sec * hz + tv->tv_usec / tick; 903 904 switch (optname) { 905 906 case SO_SNDTIMEO: 907 so->so_snd.sb_timeo = val; 908 break; 909 case SO_RCVTIMEO: 910 so->so_rcv.sb_timeo = val; 911 break; 912 } 913 break; 914 } 915 916 default: 917 error = ENOPROTOOPT; 918 break; 919 } 920 } 921 bad: 922 if (m) 923 (void) m_free(m); 924 return (error); 925 } 926 927 sogetopt(so, level, optname, mp) 928 register struct socket *so; 929 int level, optname; 930 struct mbuf **mp; 931 { 932 register struct mbuf *m; 933 934 if (level != SOL_SOCKET) { 935 if (so->so_proto && so->so_proto->pr_ctloutput) { 936 return ((*so->so_proto->pr_ctloutput) 937 (PRCO_GETOPT, so, level, optname, mp)); 938 } else 939 return (ENOPROTOOPT); 940 } else { 941 m = m_get(M_WAIT, MT_SOOPTS); 942 m->m_len = sizeof (int); 943 944 switch (optname) { 945 946 case SO_LINGER: 947 m->m_len = sizeof (struct linger); 948 mtod(m, struct linger *)->l_onoff = 949 so->so_options & SO_LINGER; 950 mtod(m, struct linger *)->l_linger = so->so_linger; 951 break; 952 953 case SO_USELOOPBACK: 954 case SO_DONTROUTE: 955 case SO_DEBUG: 956 case SO_KEEPALIVE: 957 case SO_REUSEADDR: 958 case SO_BROADCAST: 959 case SO_OOBINLINE: 960 *mtod(m, int *) = so->so_options & optname; 961 break; 962 963 case SO_TYPE: 964 *mtod(m, int *) = so->so_type; 965 break; 966 967 case SO_ERROR: 968 *mtod(m, int *) = so->so_error; 969 so->so_error = 0; 970 break; 971 972 case SO_SNDBUF: 973 *mtod(m, int *) = so->so_snd.sb_hiwat; 974 break; 975 976 case SO_RCVBUF: 977 *mtod(m, int *) = so->so_rcv.sb_hiwat; 978 break; 979 980 case SO_SNDLOWAT: 981 *mtod(m, int *) = so->so_snd.sb_lowat; 982 break; 983 984 case SO_RCVLOWAT: 985 *mtod(m, int *) = so->so_rcv.sb_lowat; 986 break; 987 988 case SO_SNDTIMEO: 989 case SO_RCVTIMEO: 990 { 991 int val = (optname == SO_SNDTIMEO ? 992 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 993 994 m->m_len = sizeof(struct timeval); 995 mtod(m, struct timeval *)->tv_sec = val / hz; 996 mtod(m, struct timeval *)->tv_usec = 997 (val % hz) / tick; 998 break; 999 } 1000 1001 default: 1002 (void)m_free(m); 1003 return (ENOPROTOOPT); 1004 } 1005 *mp = m; 1006 return (0); 1007 } 1008 } 1009 1010 sohasoutofband(so) 1011 register struct socket *so; 1012 { 1013 struct proc *p; 1014 1015 if (so->so_pgid < 0) 1016 gsignal(-so->so_pgid, SIGURG); 1017 else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0) 1018 psignal(p, SIGURG); 1019 selwakeup(&so->so_rcv.sb_sel); 1020 } 1021
Indexes created Sat Sep 20 22:09:52 GMT 2025