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 1993/09/08 21:12:49 mycroft Exp $ 35 */ 36 37 #include "param.h" 38 #include "systm.h" 39 #include "proc.h" 40 #include "file.h" 41 #include "malloc.h" 42 #include "mbuf.h" 43 #include "domain.h" 44 #include "kernel.h" 45 #include "select.h" 46 #include "protosw.h" 47 #include "socket.h" 48 #include "socketvar.h" 49 #include "resourcevar.h" 50 51 /* 52 * Socket operation routines. 53 * These routines are called by the routines in 54 * sys_socket.c or from a system process, and 55 * implement the semantics of socket operations by 56 * switching out to the protocol specific routines. 57 */ 58 /*ARGSUSED*/ 59 int 60 socreate(dom, aso, type, proto) 61 struct socket **aso; 62 register int type; 63 int proto; 64 { 65 struct proc *p = curproc; /* XXX */ 66 register struct protosw *prp; 67 register struct socket *so; 68 register int error; 69 70 if (proto) 71 prp = pffindproto(dom, proto, type); 72 else 73 prp = pffindtype(dom, type); 74 if (!prp || !prp->pr_usrreq) 75 return (EPROTONOSUPPORT); 76 if (prp->pr_type != type) 77 return (EPROTOTYPE); 78 MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_WAIT); 79 bzero((caddr_t)so, sizeof(*so)); 80 so->so_type = type; 81 if (p->p_ucred->cr_uid == 0) 82 so->so_state = SS_PRIV; 83 so->so_proto = prp; 84 error = 85 (*prp->pr_usrreq)(so, PRU_ATTACH, 86 (struct mbuf *)0, (struct mbuf *)proto, (struct mbuf *)0); 87 if (error) { 88 so->so_state |= SS_NOFDREF; 89 sofree(so); 90 return (error); 91 } 92 *aso = so; 93 return (0); 94 } 95 96 int 97 sobind(so, nam) 98 struct socket *so; 99 struct mbuf *nam; 100 { 101 int s = splnet(); 102 int error; 103 104 error = 105 (*so->so_proto->pr_usrreq)(so, PRU_BIND, 106 (struct mbuf *)0, nam, (struct mbuf *)0); 107 splx(s); 108 return (error); 109 } 110 111 int 112 solisten(so, backlog) 113 register struct socket *so; 114 int backlog; 115 { 116 int s = splnet(), error; 117 118 error = 119 (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, 120 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 121 if (error) { 122 splx(s); 123 return (error); 124 } 125 if (so->so_q == 0) 126 so->so_options |= SO_ACCEPTCONN; 127 if (backlog < 0) 128 backlog = 0; 129 so->so_qlimit = min(backlog, SOMAXCONN); 130 splx(s); 131 return (0); 132 } 133 134 int 135 sofree(so) 136 register struct socket *so; 137 { 138 139 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 140 return; 141 if (so->so_head) { 142 if (!soqremque(so, 0) && !soqremque(so, 1)) 143 panic("sofree dq"); 144 so->so_head = 0; 145 } 146 sbrelease(&so->so_snd); 147 sorflush(so); 148 FREE(so, M_SOCKET); 149 } 150 151 /* 152 * Close a socket on last file table reference removal. 153 * Initiate disconnect if connected. 154 * Free socket when disconnect complete. 155 */ 156 int 157 soclose(so) 158 register struct socket *so; 159 { 160 int s = splnet(); /* conservative */ 161 int error = 0; 162 163 if (so->so_options & SO_ACCEPTCONN) { 164 while (so->so_q0) 165 (void) soabort(so->so_q0); 166 while (so->so_q) 167 (void) soabort(so->so_q); 168 } 169 if (so->so_pcb == 0) 170 goto discard; 171 if (so->so_state & SS_ISCONNECTED) { 172 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 173 error = sodisconnect(so); 174 if (error) 175 goto drop; 176 } 177 if (so->so_options & SO_LINGER) { 178 if ((so->so_state & SS_ISDISCONNECTING) && 179 (so->so_state & SS_NBIO)) 180 goto drop; 181 while (so->so_state & SS_ISCONNECTED) 182 if (error = tsleep((caddr_t)&so->so_timeo, 183 PSOCK | PCATCH, netcls, so->so_linger)) 184 break; 185 } 186 } 187 drop: 188 if (so->so_pcb) { 189 int error2 = 190 (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 191 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 192 if (error == 0) 193 error = error2; 194 } 195 discard: 196 if (so->so_state & SS_NOFDREF) 197 panic("soclose: NOFDREF"); 198 so->so_state |= SS_NOFDREF; 199 sofree(so); 200 splx(s); 201 return (error); 202 } 203 204 /* 205 * Must be called at splnet... 206 */ 207 int 208 soabort(so) 209 struct socket *so; 210 { 211 212 return ( 213 (*so->so_proto->pr_usrreq)(so, PRU_ABORT, 214 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 215 } 216 217 int 218 soaccept(so, nam) 219 register struct socket *so; 220 struct mbuf *nam; 221 { 222 int s = splnet(); 223 int error; 224 225 if ((so->so_state & SS_NOFDREF) == 0) 226 panic("soaccept: !NOFDREF"); 227 so->so_state &= ~SS_NOFDREF; 228 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 229 (struct mbuf *)0, nam, (struct mbuf *)0); 230 splx(s); 231 return (error); 232 } 233 234 int 235 soconnect(so, nam) 236 register struct socket *so; 237 struct mbuf *nam; 238 { 239 int s; 240 int error; 241 242 if (so->so_options & SO_ACCEPTCONN) 243 return (EOPNOTSUPP); 244 s = splnet(); 245 /* 246 * If protocol is connection-based, can only connect once. 247 * Otherwise, if connected, try to disconnect first. 248 * This allows user to disconnect by connecting to, e.g., 249 * a null address. 250 */ 251 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 252 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 253 (error = sodisconnect(so)))) 254 error = EISCONN; 255 else 256 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 257 (struct mbuf *)0, nam, (struct mbuf *)0); 258 splx(s); 259 return (error); 260 } 261 262 int 263 soconnect2(so1, so2) 264 register struct socket *so1; 265 struct socket *so2; 266 { 267 int s = splnet(); 268 int error; 269 270 error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, 271 (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0); 272 splx(s); 273 return (error); 274 } 275 276 int 277 sodisconnect(so) 278 register struct socket *so; 279 { 280 int s = splnet(); 281 int error; 282 283 if ((so->so_state & SS_ISCONNECTED) == 0) { 284 error = ENOTCONN; 285 goto bad; 286 } 287 if (so->so_state & SS_ISDISCONNECTING) { 288 error = EALREADY; 289 goto bad; 290 } 291 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 292 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0); 293 bad: 294 splx(s); 295 return (error); 296 } 297 298 /* 299 * Send on a socket. 300 * If send must go all at once and message is larger than 301 * send buffering, then hard error. 302 * Lock against other senders. 303 * If must go all at once and not enough room now, then 304 * inform user that this would block and do nothing. 305 * Otherwise, if nonblocking, send as much as possible. 306 * The data to be sent is described by "uio" if nonzero, 307 * otherwise by the mbuf chain "top" (which must be null 308 * if uio is not). Data provided in mbuf chain must be small 309 * enough to send all at once. 310 * 311 * Returns nonzero on error, timeout or signal; callers 312 * must check for short counts if EINTR/ERESTART are returned. 313 * Data and control buffers are freed on return. 314 */ 315 int 316 sosend(so, addr, uio, top, control, flags) 317 register struct socket *so; 318 struct mbuf *addr; 319 struct uio *uio; 320 struct mbuf *top; 321 struct mbuf *control; 322 int flags; 323 { 324 struct proc *p = curproc; /* XXX */ 325 struct mbuf **mp; 326 register struct mbuf *m; 327 register long space, len, resid; 328 int clen = 0, error, s, dontroute, mlen; 329 int atomic = sosendallatonce(so) || top; 330 331 if (uio) 332 resid = uio->uio_resid; 333 else 334 resid = top->m_pkthdr.len; 335 dontroute = 336 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 337 (so->so_proto->pr_flags & PR_ATOMIC); 338 p->p_stats->p_ru.ru_msgsnd++; 339 if (control) 340 clen = control->m_len; 341 #define snderr(errno) { error = errno; splx(s); goto release; } 342 343 restart: 344 if (error = sblock(&so->so_snd)) 345 goto out; 346 do { 347 s = splnet(); 348 if (so->so_state & SS_CANTSENDMORE) 349 snderr(EPIPE); 350 if (so->so_error) 351 snderr(so->so_error); 352 if ((so->so_state & SS_ISCONNECTED) == 0) { 353 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 354 if ((so->so_state & SS_ISCONFIRMING) == 0 && 355 !(resid == 0 && clen != 0)) 356 snderr(ENOTCONN); 357 } else if (addr == 0) 358 snderr(EDESTADDRREQ); 359 } 360 space = sbspace(&so->so_snd); 361 if (flags & MSG_OOB) 362 space += 1024; 363 if (space < resid + clen && 364 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 365 if (atomic && resid > so->so_snd.sb_hiwat || 366 clen > so->so_snd.sb_hiwat) 367 snderr(EMSGSIZE); 368 if (so->so_state & SS_NBIO) 369 snderr(EWOULDBLOCK); 370 sbunlock(&so->so_snd); 371 error = sbwait(&so->so_snd); 372 splx(s); 373 if (error) 374 goto out; 375 goto restart; 376 } 377 splx(s); 378 mp = ⊤ 379 space -= clen; 380 do { 381 if (uio == NULL) { 382 /* 383 * Data is prepackaged in "top". 384 */ 385 resid = 0; 386 if (flags & MSG_EOR) 387 top->m_flags |= M_EOR; 388 } else do { 389 if (top == 0) { 390 MGETHDR(m, M_WAIT, MT_DATA); 391 mlen = MHLEN; 392 m->m_pkthdr.len = 0; 393 m->m_pkthdr.rcvif = (struct ifnet *)0; 394 } else { 395 MGET(m, M_WAIT, MT_DATA); 396 mlen = MLEN; 397 } 398 if (resid >= MINCLSIZE) { 399 MCLGET(m, M_WAIT); 400 if ((m->m_flags & M_EXT) == 0) 401 goto nopages; 402 mlen = MCLBYTES; 403 #ifdef MAPPED_MBUFS 404 len = min(MCLBYTES, resid); 405 #else 406 if (top == 0) { 407 len = min(MCLBYTES - max_hdr, resid); 408 m->m_data += max_hdr; 409 } else 410 len = min(MCLBYTES, resid); 411 #endif 412 len = min(len, space); 413 space -= len; 414 } else { 415 nopages: 416 len = min(min(mlen, resid), space); 417 space -= len; 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 error = uiomove(mtod(m, caddr_t), (int)len, uio); 426 resid = uio->uio_resid; 427 m->m_len = len; 428 *mp = m; 429 top->m_pkthdr.len += len; 430 if (error) 431 goto release; 432 mp = &m->m_next; 433 if (resid <= 0) { 434 if (flags & MSG_EOR) 435 top->m_flags |= M_EOR; 436 break; 437 } 438 } while (space > 0 && atomic); 439 if (dontroute) 440 so->so_options |= SO_DONTROUTE; 441 s = splnet(); /* XXX */ 442 error = (*so->so_proto->pr_usrreq)(so, 443 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 444 top, addr, control); 445 splx(s); 446 if (dontroute) 447 so->so_options &= ~SO_DONTROUTE; 448 clen = 0; 449 control = 0; 450 top = 0; 451 mp = ⊤ 452 if (error) 453 goto release; 454 } while (resid && space > 0); 455 } while (resid); 456 457 release: 458 sbunlock(&so->so_snd); 459 out: 460 if (top) 461 m_freem(top); 462 if (control) 463 m_freem(control); 464 return (error); 465 } 466 467 /* 468 * Implement receive operations on a socket. 469 * We depend on the way that records are added to the sockbuf 470 * by sbappend*. In particular, each record (mbufs linked through m_next) 471 * must begin with an address if the protocol so specifies, 472 * followed by an optional mbuf or mbufs containing ancillary data, 473 * and then zero or more mbufs of data. 474 * In order to avoid blocking network interrupts for the entire time here, 475 * we splx() while doing the actual copy to user space. 476 * Although the sockbuf is locked, new data may still be appended, 477 * and thus we must maintain consistency of the sockbuf during that time. 478 * 479 * The caller may receive the data as a single mbuf chain by supplying 480 * an mbuf **mp0 for use in returning the chain. The uio is then used 481 * only for the count in uio_resid. 482 */ 483 int 484 soreceive(so, paddr, uio, mp0, controlp, flagsp) 485 register struct socket *so; 486 struct mbuf **paddr; 487 struct uio *uio; 488 struct mbuf **mp0; 489 struct mbuf **controlp; 490 int *flagsp; 491 { 492 struct proc *p = curproc; /* XXX */ 493 register struct mbuf *m, **mp; 494 register int flags, len, error, s, offset; 495 struct protosw *pr = so->so_proto; 496 struct mbuf *nextrecord; 497 int moff, type; 498 int orig_resid = uio->uio_resid; 499 500 mp = mp0; 501 if (paddr) 502 *paddr = 0; 503 if (controlp) 504 *controlp = 0; 505 if (flagsp) 506 flags = *flagsp &~ MSG_EOR; 507 else 508 flags = 0; 509 if (flags & MSG_OOB) { 510 m = m_get(M_WAIT, MT_DATA); 511 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, 512 m, (struct mbuf *)(flags & MSG_PEEK), (struct mbuf *)0); 513 if (error) 514 goto bad; 515 do { 516 error = uiomove(mtod(m, caddr_t), 517 (int) min(uio->uio_resid, m->m_len), uio); 518 m = m_free(m); 519 } while (uio->uio_resid && error == 0 && m); 520 bad: 521 if (m) 522 m_freem(m); 523 return (error); 524 } 525 if (mp) 526 *mp = (struct mbuf *)0; 527 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 528 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 529 (struct mbuf *)0, (struct mbuf *)0); 530 531 restart: 532 if (error = sblock(&so->so_rcv)) 533 return (error); 534 s = splnet(); 535 536 m = so->so_rcv.sb_mb; 537 /* 538 * If we have less data than requested, block awaiting more 539 * (subject to any timeout) if: 540 * 1. the current count is less than the low water mark, or 541 * 2. MSG_WAITALL is set, and it is possible to do the entire 542 * receive operation at once if we block (resid <= hiwat). 543 * If MSG_WAITALL is set but resid is larger than the receive buffer, 544 * we have to do the receive in sections, and thus risk returning 545 * a short count if a timeout or signal occurs after we start. 546 */ 547 while (m == 0 || so->so_rcv.sb_cc < uio->uio_resid && 548 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 549 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 550 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0) { 551 #ifdef DIAGNOSTIC 552 if (m == 0 && so->so_rcv.sb_cc) 553 panic("receive 1"); 554 #endif 555 if (so->so_error) { 556 if (m) 557 break; 558 error = so->so_error; 559 if ((flags & MSG_PEEK) == 0) 560 so->so_error = 0; 561 goto release; 562 } 563 if (so->so_state & SS_CANTRCVMORE) { 564 if (m) 565 break; 566 else 567 goto release; 568 } 569 for (; m; m = m->m_next) 570 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 571 m = so->so_rcv.sb_mb; 572 goto dontblock; 573 } 574 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 575 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 576 error = ENOTCONN; 577 goto release; 578 } 579 if (uio->uio_resid == 0) 580 goto release; 581 if (so->so_state & SS_NBIO) { 582 error = EWOULDBLOCK; 583 goto release; 584 } 585 sbunlock(&so->so_rcv); 586 error = sbwait(&so->so_rcv); 587 splx(s); 588 if (error) 589 return (error); 590 goto restart; 591 } 592 dontblock: 593 p->p_stats->p_ru.ru_msgrcv++; 594 nextrecord = m->m_nextpkt; 595 if (pr->pr_flags & PR_ADDR) { 596 #ifdef DIAGNOSTIC 597 if (m->m_type != MT_SONAME) 598 panic("receive 1a"); 599 #endif 600 orig_resid = 0; 601 if (flags & MSG_PEEK) { 602 if (paddr) 603 *paddr = m_copy(m, 0, m->m_len); 604 m = m->m_next; 605 } else { 606 sbfree(&so->so_rcv, m); 607 if (paddr) { 608 *paddr = m; 609 so->so_rcv.sb_mb = m->m_next; 610 m->m_next = 0; 611 m = so->so_rcv.sb_mb; 612 } else { 613 MFREE(m, so->so_rcv.sb_mb); 614 m = so->so_rcv.sb_mb; 615 } 616 } 617 } 618 while (m && m->m_type == MT_CONTROL && error == 0) { 619 if (flags & MSG_PEEK) { 620 if (controlp) 621 *controlp = m_copy(m, 0, m->m_len); 622 m = m->m_next; 623 } else { 624 sbfree(&so->so_rcv, m); 625 if (controlp) { 626 if (pr->pr_domain->dom_externalize && 627 mtod(m, struct cmsghdr *)->cmsg_type == 628 SCM_RIGHTS) 629 error = (*pr->pr_domain->dom_externalize)(m); 630 *controlp = m; 631 so->so_rcv.sb_mb = m->m_next; 632 m->m_next = 0; 633 m = so->so_rcv.sb_mb; 634 } else { 635 MFREE(m, so->so_rcv.sb_mb); 636 m = so->so_rcv.sb_mb; 637 } 638 } 639 if (controlp) { 640 orig_resid = 0; 641 controlp = &(*controlp)->m_next; 642 } 643 } 644 if (m) { 645 if ((flags & MSG_PEEK) == 0) 646 m->m_nextpkt = nextrecord; 647 type = m->m_type; 648 if (type == MT_OOBDATA) 649 flags |= MSG_OOB; 650 } 651 moff = 0; 652 offset = 0; 653 while (m && uio->uio_resid > 0 && error == 0) { 654 if (m->m_type == MT_OOBDATA) { 655 if (type != MT_OOBDATA) 656 break; 657 } else if (type == MT_OOBDATA) 658 break; 659 #ifdef DIAGNOSTIC 660 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 661 panic("receive 3"); 662 #endif 663 so->so_state &= ~SS_RCVATMARK; 664 len = uio->uio_resid; 665 if (so->so_oobmark && len > so->so_oobmark - offset) 666 len = so->so_oobmark - offset; 667 if (len > m->m_len - moff) 668 len = m->m_len - moff; 669 /* 670 * If mp is set, just pass back the mbufs. 671 * Otherwise copy them out via the uio, then free. 672 * Sockbuf must be consistent here (points to current mbuf, 673 * it points to next record) when we drop priority; 674 * we must note any additions to the sockbuf when we 675 * block interrupts again. 676 */ 677 if (mp == 0) { 678 splx(s); 679 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 680 s = splnet(); 681 } else 682 uio->uio_resid -= len; 683 if (len == m->m_len - moff) { 684 if (m->m_flags & M_EOR) 685 flags |= MSG_EOR; 686 if (flags & MSG_PEEK) { 687 m = m->m_next; 688 moff = 0; 689 } else { 690 nextrecord = m->m_nextpkt; 691 sbfree(&so->so_rcv, m); 692 if (mp) { 693 *mp = m; 694 mp = &m->m_next; 695 so->so_rcv.sb_mb = m = m->m_next; 696 *mp = (struct mbuf *)0; 697 } else { 698 MFREE(m, so->so_rcv.sb_mb); 699 m = so->so_rcv.sb_mb; 700 } 701 if (m) 702 m->m_nextpkt = nextrecord; 703 } 704 } else { 705 if (flags & MSG_PEEK) 706 moff += len; 707 else { 708 if (mp) 709 *mp = m_copym(m, 0, len, M_WAIT); 710 m->m_data += len; 711 m->m_len -= len; 712 so->so_rcv.sb_cc -= len; 713 } 714 } 715 if (so->so_oobmark) { 716 if ((flags & MSG_PEEK) == 0) { 717 so->so_oobmark -= len; 718 if (so->so_oobmark == 0) { 719 so->so_state |= SS_RCVATMARK; 720 break; 721 } 722 } else 723 offset += len; 724 } 725 if (flags & MSG_EOR) 726 break; 727 /* 728 * If the MSG_WAITALL flag is set (for non-atomic socket), 729 * we must not quit until "uio->uio_resid == 0" or an error 730 * termination. If a signal/timeout occurs, return 731 * with a short count but without error. 732 * Keep sockbuf locked against other readers. 733 */ 734 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 735 !sosendallatonce(so) && !nextrecord) { 736 if (so->so_error || so->so_state & SS_CANTRCVMORE) 737 break; 738 error = sbwait(&so->so_rcv); 739 if (error) { 740 sbunlock(&so->so_rcv); 741 splx(s); 742 return (0); 743 } 744 if (m = so->so_rcv.sb_mb) 745 nextrecord = m->m_nextpkt; 746 } 747 } 748 749 if (m && pr->pr_flags & PR_ATOMIC) { 750 flags |= MSG_TRUNC; 751 if ((flags & MSG_PEEK) == 0) 752 (void) sbdroprecord(&so->so_rcv); 753 } 754 if ((flags & MSG_PEEK) == 0) { 755 if (m == 0) 756 so->so_rcv.sb_mb = nextrecord; 757 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 758 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 759 (struct mbuf *)flags, (struct mbuf *)0, 760 (struct mbuf *)0); 761 } 762 if (orig_resid == uio->uio_resid && orig_resid && 763 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 764 sbunlock(&so->so_rcv); 765 splx(s); 766 goto restart; 767 } 768 769 if (flagsp) 770 *flagsp |= flags; 771 release: 772 sbunlock(&so->so_rcv); 773 splx(s); 774 return (error); 775 } 776 777 soshutdown(so, how) 778 register struct socket *so; 779 register int how; 780 { 781 register struct protosw *pr = so->so_proto; 782 783 how++; 784 if (how & FREAD) 785 sorflush(so); 786 if (how & FWRITE) 787 return ((*pr->pr_usrreq)(so, PRU_SHUTDOWN, 788 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0)); 789 return (0); 790 } 791 792 sorflush(so) 793 register struct socket *so; 794 { 795 register struct sockbuf *sb = &so->so_rcv; 796 register struct protosw *pr = so->so_proto; 797 register int s; 798 struct sockbuf asb; 799 800 sb->sb_flags |= SB_NOINTR; 801 (void) sblock(sb); 802 s = splimp(); 803 socantrcvmore(so); 804 sbunlock(sb); 805 asb = *sb; 806 bzero((caddr_t)sb, sizeof (*sb)); 807 splx(s); 808 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 809 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 810 sbrelease(&asb); 811 } 812 813 sosetopt(so, level, optname, m0) 814 register struct socket *so; 815 int level, optname; 816 struct mbuf *m0; 817 { 818 int error = 0; 819 register struct mbuf *m = m0; 820 821 if (level != SOL_SOCKET) { 822 if (so->so_proto && so->so_proto->pr_ctloutput) 823 return ((*so->so_proto->pr_ctloutput) 824 (PRCO_SETOPT, so, level, optname, &m0)); 825 error = ENOPROTOOPT; 826 } else { 827 switch (optname) { 828 829 case SO_LINGER: 830 if (m == NULL || m->m_len != sizeof (struct linger)) { 831 error = EINVAL; 832 goto bad; 833 } 834 so->so_linger = mtod(m, struct linger *)->l_linger; 835 /* fall thru... */ 836 837 case SO_DEBUG: 838 case SO_KEEPALIVE: 839 case SO_DONTROUTE: 840 case SO_USELOOPBACK: 841 case SO_BROADCAST: 842 case SO_REUSEADDR: 843 case SO_OOBINLINE: 844 if (m == NULL || m->m_len < sizeof (int)) { 845 error = EINVAL; 846 goto bad; 847 } 848 if (*mtod(m, int *)) 849 so->so_options |= optname; 850 else 851 so->so_options &= ~optname; 852 break; 853 854 case SO_SNDBUF: 855 case SO_RCVBUF: 856 case SO_SNDLOWAT: 857 case SO_RCVLOWAT: 858 if (m == NULL || m->m_len < sizeof (int)) { 859 error = EINVAL; 860 goto bad; 861 } 862 switch (optname) { 863 864 case SO_SNDBUF: 865 case SO_RCVBUF: 866 if (sbreserve(optname == SO_SNDBUF ? 867 &so->so_snd : &so->so_rcv, 868 (u_long) *mtod(m, int *)) == 0) { 869 error = ENOBUFS; 870 goto bad; 871 } 872 break; 873 874 case SO_SNDLOWAT: 875 so->so_snd.sb_lowat = *mtod(m, int *); 876 break; 877 case SO_RCVLOWAT: 878 so->so_rcv.sb_lowat = *mtod(m, int *); 879 break; 880 } 881 break; 882 883 case SO_SNDTIMEO: 884 case SO_RCVTIMEO: 885 { 886 struct timeval *tv; 887 short val; 888 889 if (m == NULL || m->m_len < sizeof (*tv)) { 890 error = EINVAL; 891 goto bad; 892 } 893 tv = mtod(m, struct timeval *); 894 if (tv->tv_sec > SHRT_MAX / hz - hz) { 895 error = EDOM; 896 goto bad; 897 } 898 val = tv->tv_sec * hz + tv->tv_usec / tick; 899 900 switch (optname) { 901 902 case SO_SNDTIMEO: 903 so->so_snd.sb_timeo = val; 904 break; 905 case SO_RCVTIMEO: 906 so->so_rcv.sb_timeo = val; 907 break; 908 } 909 break; 910 } 911 912 default: 913 error = ENOPROTOOPT; 914 break; 915 } 916 } 917 bad: 918 if (m) 919 (void) m_free(m); 920 return (error); 921 } 922 923 sogetopt(so, level, optname, mp) 924 register struct socket *so; 925 int level, optname; 926 struct mbuf **mp; 927 { 928 register struct mbuf *m; 929 930 if (level != SOL_SOCKET) { 931 if (so->so_proto && so->so_proto->pr_ctloutput) { 932 return ((*so->so_proto->pr_ctloutput) 933 (PRCO_GETOPT, so, level, optname, mp)); 934 } else 935 return (ENOPROTOOPT); 936 } else { 937 m = m_get(M_WAIT, MT_SOOPTS); 938 m->m_len = sizeof (int); 939 940 switch (optname) { 941 942 case SO_LINGER: 943 m->m_len = sizeof (struct linger); 944 mtod(m, struct linger *)->l_onoff = 945 so->so_options & SO_LINGER; 946 mtod(m, struct linger *)->l_linger = so->so_linger; 947 break; 948 949 case SO_USELOOPBACK: 950 case SO_DONTROUTE: 951 case SO_DEBUG: 952 case SO_KEEPALIVE: 953 case SO_REUSEADDR: 954 case SO_BROADCAST: 955 case SO_OOBINLINE: 956 *mtod(m, int *) = so->so_options & optname; 957 break; 958 959 case SO_TYPE: 960 *mtod(m, int *) = so->so_type; 961 break; 962 963 case SO_ERROR: 964 *mtod(m, int *) = so->so_error; 965 so->so_error = 0; 966 break; 967 968 case SO_SNDBUF: 969 *mtod(m, int *) = so->so_snd.sb_hiwat; 970 break; 971 972 case SO_RCVBUF: 973 *mtod(m, int *) = so->so_rcv.sb_hiwat; 974 break; 975 976 case SO_SNDLOWAT: 977 *mtod(m, int *) = so->so_snd.sb_lowat; 978 break; 979 980 case SO_RCVLOWAT: 981 *mtod(m, int *) = so->so_rcv.sb_lowat; 982 break; 983 984 case SO_SNDTIMEO: 985 case SO_RCVTIMEO: 986 { 987 int val = (optname == SO_SNDTIMEO ? 988 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 989 990 m->m_len = sizeof(struct timeval); 991 mtod(m, struct timeval *)->tv_sec = val / hz; 992 mtod(m, struct timeval *)->tv_usec = 993 (val % hz) / tick; 994 break; 995 } 996 997 default: 998 (void)m_free(m); 999 return (ENOPROTOOPT); 1000 } 1001 *mp = m; 1002 return (0); 1003 } 1004 } 1005 1006 sohasoutofband(so) 1007 register struct socket *so; 1008 { 1009 struct proc *p; 1010 1011 if (so->so_pgid < 0) 1012 gsignal(-so->so_pgid, SIGURG); 1013 else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0) 1014 psignal(p, SIGURG); 1015 selwakeup(&so->so_rcv.sb_sel); 1016 } 1017