1 /* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. 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 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94 34 * $FreeBSD$ 35 */ 36 37 #include "opt_inet.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/fcntl.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/mutex.h> 46 #include <sys/domain.h> 47 #include <sys/file.h> /* for struct knote */ 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/event.h> 51 #include <sys/poll.h> 52 #include <sys/proc.h> 53 #include <sys/protosw.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/resourcevar.h> 57 #include <sys/signalvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/uio.h> 60 #include <sys/jail.h> 61 62 #include <vm/vm_zone.h> 63 64 #include <machine/limits.h> 65 66 #ifdef INET 67 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 68 #endif 69 70 static void filt_sordetach(struct knote *kn); 71 static int filt_soread(struct knote *kn, long hint); 72 static void filt_sowdetach(struct knote *kn); 73 static int filt_sowrite(struct knote *kn, long hint); 74 static int filt_solisten(struct knote *kn, long hint); 75 76 static struct filterops solisten_filtops = 77 { 1, NULL, filt_sordetach, filt_solisten }; 78 static struct filterops soread_filtops = 79 { 1, NULL, filt_sordetach, filt_soread }; 80 static struct filterops sowrite_filtops = 81 { 1, NULL, filt_sowdetach, filt_sowrite }; 82 83 struct vm_zone *socket_zone; 84 so_gen_t so_gencnt; /* generation count for sockets */ 85 86 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 87 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 88 89 SYSCTL_DECL(_kern_ipc); 90 91 static int somaxconn = SOMAXCONN; 92 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 93 &somaxconn, 0, "Maximum pending socket connection queue size"); 94 95 /* 96 * Socket operation routines. 97 * These routines are called by the routines in 98 * sys_socket.c or from a system process, and 99 * implement the semantics of socket operations by 100 * switching out to the protocol specific routines. 101 */ 102 103 /* 104 * Get a socket structure from our zone, and initialize it. 105 * We don't implement `waitok' yet (see comments in uipc_domain.c). 106 * Note that it would probably be better to allocate socket 107 * and PCB at the same time, but I'm not convinced that all 108 * the protocols can be easily modified to do this. 109 */ 110 struct socket * 111 soalloc(waitok) 112 int waitok; 113 { 114 struct socket *so; 115 116 so = zalloc(socket_zone); 117 if (so) { 118 /* XXX race condition for reentrant kernel */ 119 bzero(so, sizeof *so); 120 so->so_gencnt = ++so_gencnt; 121 so->so_zone = socket_zone; 122 TAILQ_INIT(&so->so_aiojobq); 123 } 124 return so; 125 } 126 127 int 128 socreate(dom, aso, type, proto, td) 129 int dom; 130 struct socket **aso; 131 register int type; 132 int proto; 133 struct thread *td; 134 { 135 register struct protosw *prp; 136 register struct socket *so; 137 register int error; 138 139 if (proto) 140 prp = pffindproto(dom, proto, type); 141 else 142 prp = pffindtype(dom, type); 143 144 if (prp == 0 || prp->pr_usrreqs->pru_attach == 0) 145 return (EPROTONOSUPPORT); 146 147 if (jailed(td->td_proc->p_ucred) && jail_socket_unixiproute_only && 148 prp->pr_domain->dom_family != PF_LOCAL && 149 prp->pr_domain->dom_family != PF_INET && 150 prp->pr_domain->dom_family != PF_ROUTE) { 151 return (EPROTONOSUPPORT); 152 } 153 154 if (prp->pr_type != type) 155 return (EPROTOTYPE); 156 so = soalloc(td != 0); 157 if (so == 0) 158 return (ENOBUFS); 159 160 TAILQ_INIT(&so->so_incomp); 161 TAILQ_INIT(&so->so_comp); 162 so->so_type = type; 163 so->so_cred = crhold(td->td_proc->p_ucred); 164 so->so_proto = prp; 165 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td); 166 if (error) { 167 so->so_state |= SS_NOFDREF; 168 sofree(so); 169 return (error); 170 } 171 *aso = so; 172 return (0); 173 } 174 175 int 176 sobind(so, nam, td) 177 struct socket *so; 178 struct sockaddr *nam; 179 struct thread *td; 180 { 181 int s = splnet(); 182 int error; 183 184 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td); 185 splx(s); 186 return (error); 187 } 188 189 void 190 sodealloc(so) 191 struct socket *so; 192 { 193 194 so->so_gencnt = ++so_gencnt; 195 if (so->so_rcv.sb_hiwat) 196 (void)chgsbsize(so->so_cred->cr_uidinfo, 197 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY); 198 if (so->so_snd.sb_hiwat) 199 (void)chgsbsize(so->so_cred->cr_uidinfo, 200 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY); 201 #ifdef INET 202 if (so->so_accf != NULL) { 203 if (so->so_accf->so_accept_filter != NULL && 204 so->so_accf->so_accept_filter->accf_destroy != NULL) { 205 so->so_accf->so_accept_filter->accf_destroy(so); 206 } 207 if (so->so_accf->so_accept_filter_str != NULL) 208 FREE(so->so_accf->so_accept_filter_str, M_ACCF); 209 FREE(so->so_accf, M_ACCF); 210 } 211 #endif 212 crfree(so->so_cred); 213 zfree(so->so_zone, so); 214 } 215 216 int 217 solisten(so, backlog, td) 218 register struct socket *so; 219 int backlog; 220 struct thread *td; 221 { 222 int s, error; 223 224 s = splnet(); 225 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td); 226 if (error) { 227 splx(s); 228 return (error); 229 } 230 if (TAILQ_EMPTY(&so->so_comp)) 231 so->so_options |= SO_ACCEPTCONN; 232 if (backlog < 0 || backlog > somaxconn) 233 backlog = somaxconn; 234 so->so_qlimit = backlog; 235 splx(s); 236 return (0); 237 } 238 239 void 240 sofree(so) 241 register struct socket *so; 242 { 243 struct socket *head = so->so_head; 244 245 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 246 return; 247 if (head != NULL) { 248 if (so->so_state & SS_INCOMP) { 249 TAILQ_REMOVE(&head->so_incomp, so, so_list); 250 head->so_incqlen--; 251 } else if (so->so_state & SS_COMP) { 252 /* 253 * We must not decommission a socket that's 254 * on the accept(2) queue. If we do, then 255 * accept(2) may hang after select(2) indicated 256 * that the listening socket was ready. 257 */ 258 return; 259 } else { 260 panic("sofree: not queued"); 261 } 262 head->so_qlen--; 263 so->so_state &= ~SS_INCOMP; 264 so->so_head = NULL; 265 } 266 sbrelease(&so->so_snd, so); 267 sorflush(so); 268 sodealloc(so); 269 } 270 271 /* 272 * Close a socket on last file table reference removal. 273 * Initiate disconnect if connected. 274 * Free socket when disconnect complete. 275 */ 276 int 277 soclose(so) 278 register struct socket *so; 279 { 280 int s = splnet(); /* conservative */ 281 int error = 0; 282 283 funsetown(so->so_sigio); 284 if (so->so_options & SO_ACCEPTCONN) { 285 struct socket *sp, *sonext; 286 287 sp = TAILQ_FIRST(&so->so_incomp); 288 for (; sp != NULL; sp = sonext) { 289 sonext = TAILQ_NEXT(sp, so_list); 290 (void) soabort(sp); 291 } 292 for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) { 293 sonext = TAILQ_NEXT(sp, so_list); 294 /* Dequeue from so_comp since sofree() won't do it */ 295 TAILQ_REMOVE(&so->so_comp, sp, so_list); 296 so->so_qlen--; 297 sp->so_state &= ~SS_COMP; 298 sp->so_head = NULL; 299 (void) soabort(sp); 300 } 301 } 302 if (so->so_pcb == 0) 303 goto discard; 304 if (so->so_state & SS_ISCONNECTED) { 305 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 306 error = sodisconnect(so); 307 if (error) 308 goto drop; 309 } 310 if (so->so_options & SO_LINGER) { 311 if ((so->so_state & SS_ISDISCONNECTING) && 312 (so->so_state & SS_NBIO)) 313 goto drop; 314 while (so->so_state & SS_ISCONNECTED) { 315 error = tsleep((caddr_t)&so->so_timeo, 316 PSOCK | PCATCH, "soclos", so->so_linger * hz); 317 if (error) 318 break; 319 } 320 } 321 } 322 drop: 323 if (so->so_pcb) { 324 int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); 325 if (error == 0) 326 error = error2; 327 } 328 discard: 329 if (so->so_state & SS_NOFDREF) 330 panic("soclose: NOFDREF"); 331 so->so_state |= SS_NOFDREF; 332 sofree(so); 333 splx(s); 334 return (error); 335 } 336 337 /* 338 * Must be called at splnet... 339 */ 340 int 341 soabort(so) 342 struct socket *so; 343 { 344 int error; 345 346 error = (*so->so_proto->pr_usrreqs->pru_abort)(so); 347 if (error) { 348 sofree(so); 349 return error; 350 } 351 return (0); 352 } 353 354 int 355 soaccept(so, nam) 356 register struct socket *so; 357 struct sockaddr **nam; 358 { 359 int s = splnet(); 360 int error; 361 362 if ((so->so_state & SS_NOFDREF) == 0) 363 panic("soaccept: !NOFDREF"); 364 so->so_state &= ~SS_NOFDREF; 365 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam); 366 splx(s); 367 return (error); 368 } 369 370 int 371 soconnect(so, nam, td) 372 register struct socket *so; 373 struct sockaddr *nam; 374 struct thread *td; 375 { 376 int s; 377 int error; 378 379 if (so->so_options & SO_ACCEPTCONN) 380 return (EOPNOTSUPP); 381 s = splnet(); 382 /* 383 * If protocol is connection-based, can only connect once. 384 * Otherwise, if connected, try to disconnect first. 385 * This allows user to disconnect by connecting to, e.g., 386 * a null address. 387 */ 388 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 389 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 390 (error = sodisconnect(so)))) 391 error = EISCONN; 392 else 393 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td); 394 splx(s); 395 return (error); 396 } 397 398 int 399 soconnect2(so1, so2) 400 register struct socket *so1; 401 struct socket *so2; 402 { 403 int s = splnet(); 404 int error; 405 406 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2); 407 splx(s); 408 return (error); 409 } 410 411 int 412 sodisconnect(so) 413 register struct socket *so; 414 { 415 int s = splnet(); 416 int error; 417 418 if ((so->so_state & SS_ISCONNECTED) == 0) { 419 error = ENOTCONN; 420 goto bad; 421 } 422 if (so->so_state & SS_ISDISCONNECTING) { 423 error = EALREADY; 424 goto bad; 425 } 426 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so); 427 bad: 428 splx(s); 429 return (error); 430 } 431 432 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 433 /* 434 * Send on a socket. 435 * If send must go all at once and message is larger than 436 * send buffering, then hard error. 437 * Lock against other senders. 438 * If must go all at once and not enough room now, then 439 * inform user that this would block and do nothing. 440 * Otherwise, if nonblocking, send as much as possible. 441 * The data to be sent is described by "uio" if nonzero, 442 * otherwise by the mbuf chain "top" (which must be null 443 * if uio is not). Data provided in mbuf chain must be small 444 * enough to send all at once. 445 * 446 * Returns nonzero on error, timeout or signal; callers 447 * must check for short counts if EINTR/ERESTART are returned. 448 * Data and control buffers are freed on return. 449 */ 450 int 451 sosend(so, addr, uio, top, control, flags, td) 452 register struct socket *so; 453 struct sockaddr *addr; 454 struct uio *uio; 455 struct mbuf *top; 456 struct mbuf *control; 457 int flags; 458 struct thread *td; 459 { 460 struct mbuf **mp; 461 register struct mbuf *m; 462 register long space, len, resid; 463 int clen = 0, error, s, dontroute, mlen; 464 int atomic = sosendallatonce(so) || top; 465 466 if (uio) 467 resid = uio->uio_resid; 468 else 469 resid = top->m_pkthdr.len; 470 /* 471 * In theory resid should be unsigned. 472 * However, space must be signed, as it might be less than 0 473 * if we over-committed, and we must use a signed comparison 474 * of space and resid. On the other hand, a negative resid 475 * causes us to loop sending 0-length segments to the protocol. 476 * 477 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM 478 * type sockets since that's an error. 479 */ 480 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { 481 error = EINVAL; 482 goto out; 483 } 484 485 dontroute = 486 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 487 (so->so_proto->pr_flags & PR_ATOMIC); 488 if (td) 489 td->td_proc->p_stats->p_ru.ru_msgsnd++; 490 if (control) 491 clen = control->m_len; 492 #define snderr(errno) { error = errno; splx(s); goto release; } 493 494 restart: 495 error = sblock(&so->so_snd, SBLOCKWAIT(flags)); 496 if (error) 497 goto out; 498 do { 499 s = splnet(); 500 if (so->so_state & SS_CANTSENDMORE) 501 snderr(EPIPE); 502 if (so->so_error) { 503 error = so->so_error; 504 so->so_error = 0; 505 splx(s); 506 goto release; 507 } 508 if ((so->so_state & SS_ISCONNECTED) == 0) { 509 /* 510 * `sendto' and `sendmsg' is allowed on a connection- 511 * based socket if it supports implied connect. 512 * Return ENOTCONN if not connected and no address is 513 * supplied. 514 */ 515 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && 516 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { 517 if ((so->so_state & SS_ISCONFIRMING) == 0 && 518 !(resid == 0 && clen != 0)) 519 snderr(ENOTCONN); 520 } else if (addr == 0) 521 snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ? 522 ENOTCONN : EDESTADDRREQ); 523 } 524 space = sbspace(&so->so_snd); 525 if (flags & MSG_OOB) 526 space += 1024; 527 if ((atomic && resid > so->so_snd.sb_hiwat) || 528 clen > so->so_snd.sb_hiwat) 529 snderr(EMSGSIZE); 530 if (space < resid + clen && uio && 531 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 532 if (so->so_state & SS_NBIO) 533 snderr(EWOULDBLOCK); 534 sbunlock(&so->so_snd); 535 error = sbwait(&so->so_snd); 536 splx(s); 537 if (error) 538 goto out; 539 goto restart; 540 } 541 splx(s); 542 mp = ⊤ 543 space -= clen; 544 do { 545 if (uio == NULL) { 546 /* 547 * Data is prepackaged in "top". 548 */ 549 resid = 0; 550 if (flags & MSG_EOR) 551 top->m_flags |= M_EOR; 552 } else do { 553 if (top == 0) { 554 MGETHDR(m, M_TRYWAIT, MT_DATA); 555 if (m == NULL) { 556 error = ENOBUFS; 557 goto release; 558 } 559 mlen = MHLEN; 560 m->m_pkthdr.len = 0; 561 m->m_pkthdr.rcvif = (struct ifnet *)0; 562 } else { 563 MGET(m, M_TRYWAIT, MT_DATA); 564 if (m == NULL) { 565 error = ENOBUFS; 566 goto release; 567 } 568 mlen = MLEN; 569 } 570 if (resid >= MINCLSIZE) { 571 MCLGET(m, M_TRYWAIT); 572 if ((m->m_flags & M_EXT) == 0) 573 goto nopages; 574 mlen = MCLBYTES; 575 len = min(min(mlen, resid), space); 576 } else { 577 nopages: 578 len = min(min(mlen, resid), space); 579 /* 580 * For datagram protocols, leave room 581 * for protocol headers in first mbuf. 582 */ 583 if (atomic && top == 0 && len < mlen) 584 MH_ALIGN(m, len); 585 } 586 space -= len; 587 error = uiomove(mtod(m, caddr_t), (int)len, uio); 588 resid = uio->uio_resid; 589 m->m_len = len; 590 *mp = m; 591 top->m_pkthdr.len += len; 592 if (error) 593 goto release; 594 mp = &m->m_next; 595 if (resid <= 0) { 596 if (flags & MSG_EOR) 597 top->m_flags |= M_EOR; 598 break; 599 } 600 } while (space > 0 && atomic); 601 if (dontroute) 602 so->so_options |= SO_DONTROUTE; 603 s = splnet(); /* XXX */ 604 /* 605 * XXX all the SS_CANTSENDMORE checks previously 606 * done could be out of date. We could have recieved 607 * a reset packet in an interrupt or maybe we slept 608 * while doing page faults in uiomove() etc. We could 609 * probably recheck again inside the splnet() protection 610 * here, but there are probably other places that this 611 * also happens. We must rethink this. 612 */ 613 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 614 (flags & MSG_OOB) ? PRUS_OOB : 615 /* 616 * If the user set MSG_EOF, the protocol 617 * understands this flag and nothing left to 618 * send then use PRU_SEND_EOF instead of PRU_SEND. 619 */ 620 ((flags & MSG_EOF) && 621 (so->so_proto->pr_flags & PR_IMPLOPCL) && 622 (resid <= 0)) ? 623 PRUS_EOF : 624 /* If there is more to send set PRUS_MORETOCOME */ 625 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0, 626 top, addr, control, td); 627 splx(s); 628 if (dontroute) 629 so->so_options &= ~SO_DONTROUTE; 630 clen = 0; 631 control = 0; 632 top = 0; 633 mp = ⊤ 634 if (error) 635 goto release; 636 } while (resid && space > 0); 637 } while (resid); 638 639 release: 640 sbunlock(&so->so_snd); 641 out: 642 if (top) 643 m_freem(top); 644 if (control) 645 m_freem(control); 646 return (error); 647 } 648 649 /* 650 * Implement receive operations on a socket. 651 * We depend on the way that records are added to the sockbuf 652 * by sbappend*. In particular, each record (mbufs linked through m_next) 653 * must begin with an address if the protocol so specifies, 654 * followed by an optional mbuf or mbufs containing ancillary data, 655 * and then zero or more mbufs of data. 656 * In order to avoid blocking network interrupts for the entire time here, 657 * we splx() while doing the actual copy to user space. 658 * Although the sockbuf is locked, new data may still be appended, 659 * and thus we must maintain consistency of the sockbuf during that time. 660 * 661 * The caller may receive the data as a single mbuf chain by supplying 662 * an mbuf **mp0 for use in returning the chain. The uio is then used 663 * only for the count in uio_resid. 664 */ 665 int 666 soreceive(so, psa, uio, mp0, controlp, flagsp) 667 register struct socket *so; 668 struct sockaddr **psa; 669 struct uio *uio; 670 struct mbuf **mp0; 671 struct mbuf **controlp; 672 int *flagsp; 673 { 674 struct mbuf *m, **mp; 675 register int flags, len, error, s, offset; 676 struct protosw *pr = so->so_proto; 677 struct mbuf *nextrecord; 678 int moff, type = 0; 679 int orig_resid = uio->uio_resid; 680 681 mp = mp0; 682 if (psa) 683 *psa = 0; 684 if (controlp) 685 *controlp = 0; 686 if (flagsp) 687 flags = *flagsp &~ MSG_EOR; 688 else 689 flags = 0; 690 if (flags & MSG_OOB) { 691 m = m_get(M_TRYWAIT, MT_DATA); 692 if (m == NULL) 693 return (ENOBUFS); 694 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); 695 if (error) 696 goto bad; 697 do { 698 error = uiomove(mtod(m, caddr_t), 699 (int) min(uio->uio_resid, m->m_len), uio); 700 m = m_free(m); 701 } while (uio->uio_resid && error == 0 && m); 702 bad: 703 if (m) 704 m_freem(m); 705 return (error); 706 } 707 if (mp) 708 *mp = (struct mbuf *)0; 709 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 710 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 711 712 restart: 713 error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); 714 if (error) 715 return (error); 716 s = splnet(); 717 718 m = so->so_rcv.sb_mb; 719 /* 720 * If we have less data than requested, block awaiting more 721 * (subject to any timeout) if: 722 * 1. the current count is less than the low water mark, or 723 * 2. MSG_WAITALL is set, and it is possible to do the entire 724 * receive operation at once if we block (resid <= hiwat). 725 * 3. MSG_DONTWAIT is not set 726 * If MSG_WAITALL is set but resid is larger than the receive buffer, 727 * we have to do the receive in sections, and thus risk returning 728 * a short count if a timeout or signal occurs after we start. 729 */ 730 if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && 731 so->so_rcv.sb_cc < uio->uio_resid) && 732 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 733 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 734 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 735 KASSERT(m != 0 || !so->so_rcv.sb_cc, 736 ("receive: m == %p so->so_rcv.sb_cc == %lu", 737 m, so->so_rcv.sb_cc)); 738 if (so->so_error) { 739 if (m) 740 goto dontblock; 741 error = so->so_error; 742 if ((flags & MSG_PEEK) == 0) 743 so->so_error = 0; 744 goto release; 745 } 746 if (so->so_state & SS_CANTRCVMORE) { 747 if (m) 748 goto dontblock; 749 else 750 goto release; 751 } 752 for (; m; m = m->m_next) 753 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 754 m = so->so_rcv.sb_mb; 755 goto dontblock; 756 } 757 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 758 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 759 error = ENOTCONN; 760 goto release; 761 } 762 if (uio->uio_resid == 0) 763 goto release; 764 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 765 error = EWOULDBLOCK; 766 goto release; 767 } 768 sbunlock(&so->so_rcv); 769 error = sbwait(&so->so_rcv); 770 splx(s); 771 if (error) 772 return (error); 773 goto restart; 774 } 775 dontblock: 776 if (uio->uio_td) 777 uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++; 778 nextrecord = m->m_nextpkt; 779 if (pr->pr_flags & PR_ADDR) { 780 KASSERT(m->m_type == MT_SONAME, ("receive 1a")); 781 orig_resid = 0; 782 if (psa) 783 *psa = dup_sockaddr(mtod(m, struct sockaddr *), 784 mp0 == 0); 785 if (flags & MSG_PEEK) { 786 m = m->m_next; 787 } else { 788 sbfree(&so->so_rcv, m); 789 MFREE(m, so->so_rcv.sb_mb); 790 m = so->so_rcv.sb_mb; 791 } 792 } 793 while (m && m->m_type == MT_CONTROL && error == 0) { 794 if (flags & MSG_PEEK) { 795 if (controlp) 796 *controlp = m_copy(m, 0, m->m_len); 797 m = m->m_next; 798 } else { 799 sbfree(&so->so_rcv, m); 800 so->so_rcv.sb_mb = m->m_next; 801 m->m_next = NULL; 802 if (pr->pr_domain->dom_externalize) 803 error = 804 (*pr->pr_domain->dom_externalize)(m, controlp); 805 else if (controlp) 806 *controlp = m; 807 else 808 m_freem(m); 809 m = so->so_rcv.sb_mb; 810 } 811 if (controlp) { 812 orig_resid = 0; 813 do 814 controlp = &(*controlp)->m_next; 815 while (*controlp != NULL); 816 } 817 } 818 if (m) { 819 if ((flags & MSG_PEEK) == 0) 820 m->m_nextpkt = nextrecord; 821 type = m->m_type; 822 if (type == MT_OOBDATA) 823 flags |= MSG_OOB; 824 } 825 moff = 0; 826 offset = 0; 827 while (m && uio->uio_resid > 0 && error == 0) { 828 if (m->m_type == MT_OOBDATA) { 829 if (type != MT_OOBDATA) 830 break; 831 } else if (type == MT_OOBDATA) 832 break; 833 else 834 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 835 ("receive 3")); 836 so->so_state &= ~SS_RCVATMARK; 837 len = uio->uio_resid; 838 if (so->so_oobmark && len > so->so_oobmark - offset) 839 len = so->so_oobmark - offset; 840 if (len > m->m_len - moff) 841 len = m->m_len - moff; 842 /* 843 * If mp is set, just pass back the mbufs. 844 * Otherwise copy them out via the uio, then free. 845 * Sockbuf must be consistent here (points to current mbuf, 846 * it points to next record) when we drop priority; 847 * we must note any additions to the sockbuf when we 848 * block interrupts again. 849 */ 850 if (mp == 0) { 851 splx(s); 852 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 853 s = splnet(); 854 if (error) 855 goto release; 856 } else 857 uio->uio_resid -= len; 858 if (len == m->m_len - moff) { 859 if (m->m_flags & M_EOR) 860 flags |= MSG_EOR; 861 if (flags & MSG_PEEK) { 862 m = m->m_next; 863 moff = 0; 864 } else { 865 nextrecord = m->m_nextpkt; 866 sbfree(&so->so_rcv, m); 867 if (mp) { 868 *mp = m; 869 mp = &m->m_next; 870 so->so_rcv.sb_mb = m = m->m_next; 871 *mp = (struct mbuf *)0; 872 } else { 873 MFREE(m, so->so_rcv.sb_mb); 874 m = so->so_rcv.sb_mb; 875 } 876 if (m) 877 m->m_nextpkt = nextrecord; 878 } 879 } else { 880 if (flags & MSG_PEEK) 881 moff += len; 882 else { 883 if (mp) 884 *mp = m_copym(m, 0, len, M_TRYWAIT); 885 m->m_data += len; 886 m->m_len -= len; 887 so->so_rcv.sb_cc -= len; 888 } 889 } 890 if (so->so_oobmark) { 891 if ((flags & MSG_PEEK) == 0) { 892 so->so_oobmark -= len; 893 if (so->so_oobmark == 0) { 894 so->so_state |= SS_RCVATMARK; 895 break; 896 } 897 } else { 898 offset += len; 899 if (offset == so->so_oobmark) 900 break; 901 } 902 } 903 if (flags & MSG_EOR) 904 break; 905 /* 906 * If the MSG_WAITALL flag is set (for non-atomic socket), 907 * we must not quit until "uio->uio_resid == 0" or an error 908 * termination. If a signal/timeout occurs, return 909 * with a short count but without error. 910 * Keep sockbuf locked against other readers. 911 */ 912 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 913 !sosendallatonce(so) && !nextrecord) { 914 if (so->so_error || so->so_state & SS_CANTRCVMORE) 915 break; 916 /* 917 * Notify the protocol that some data has been 918 * drained before blocking. 919 */ 920 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 921 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 922 error = sbwait(&so->so_rcv); 923 if (error) { 924 sbunlock(&so->so_rcv); 925 splx(s); 926 return (0); 927 } 928 m = so->so_rcv.sb_mb; 929 if (m) 930 nextrecord = m->m_nextpkt; 931 } 932 } 933 934 if (m && pr->pr_flags & PR_ATOMIC) { 935 flags |= MSG_TRUNC; 936 if ((flags & MSG_PEEK) == 0) 937 (void) sbdroprecord(&so->so_rcv); 938 } 939 if ((flags & MSG_PEEK) == 0) { 940 if (m == 0) 941 so->so_rcv.sb_mb = nextrecord; 942 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 943 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 944 } 945 if (orig_resid == uio->uio_resid && orig_resid && 946 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 947 sbunlock(&so->so_rcv); 948 splx(s); 949 goto restart; 950 } 951 952 if (flagsp) 953 *flagsp |= flags; 954 release: 955 sbunlock(&so->so_rcv); 956 splx(s); 957 return (error); 958 } 959 960 int 961 soshutdown(so, how) 962 register struct socket *so; 963 register int how; 964 { 965 register struct protosw *pr = so->so_proto; 966 967 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 968 return (EINVAL); 969 970 if (how != SHUT_WR) 971 sorflush(so); 972 if (how != SHUT_RD) 973 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 974 return (0); 975 } 976 977 void 978 sorflush(so) 979 register struct socket *so; 980 { 981 register struct sockbuf *sb = &so->so_rcv; 982 register struct protosw *pr = so->so_proto; 983 register int s; 984 struct sockbuf asb; 985 986 sb->sb_flags |= SB_NOINTR; 987 (void) sblock(sb, M_WAITOK); 988 s = splimp(); 989 socantrcvmore(so); 990 sbunlock(sb); 991 asb = *sb; 992 bzero((caddr_t)sb, sizeof (*sb)); 993 splx(s); 994 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 995 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 996 sbrelease(&asb, so); 997 } 998 999 #ifdef INET 1000 static int 1001 do_setopt_accept_filter(so, sopt) 1002 struct socket *so; 1003 struct sockopt *sopt; 1004 { 1005 struct accept_filter_arg *afap = NULL; 1006 struct accept_filter *afp; 1007 struct so_accf *af = so->so_accf; 1008 int error = 0; 1009 1010 /* do not set/remove accept filters on non listen sockets */ 1011 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1012 error = EINVAL; 1013 goto out; 1014 } 1015 1016 /* removing the filter */ 1017 if (sopt == NULL) { 1018 if (af != NULL) { 1019 if (af->so_accept_filter != NULL && 1020 af->so_accept_filter->accf_destroy != NULL) { 1021 af->so_accept_filter->accf_destroy(so); 1022 } 1023 if (af->so_accept_filter_str != NULL) { 1024 FREE(af->so_accept_filter_str, M_ACCF); 1025 } 1026 FREE(af, M_ACCF); 1027 so->so_accf = NULL; 1028 } 1029 so->so_options &= ~SO_ACCEPTFILTER; 1030 return (0); 1031 } 1032 /* adding a filter */ 1033 /* must remove previous filter first */ 1034 if (af != NULL) { 1035 error = EINVAL; 1036 goto out; 1037 } 1038 /* don't put large objects on the kernel stack */ 1039 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1040 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1041 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1042 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1043 if (error) 1044 goto out; 1045 afp = accept_filt_get(afap->af_name); 1046 if (afp == NULL) { 1047 error = ENOENT; 1048 goto out; 1049 } 1050 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1051 if (afp->accf_create != NULL) { 1052 if (afap->af_name[0] != '\0') { 1053 int len = strlen(afap->af_name) + 1; 1054 1055 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1056 strcpy(af->so_accept_filter_str, afap->af_name); 1057 } 1058 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1059 if (af->so_accept_filter_arg == NULL) { 1060 FREE(af->so_accept_filter_str, M_ACCF); 1061 FREE(af, M_ACCF); 1062 so->so_accf = NULL; 1063 error = EINVAL; 1064 goto out; 1065 } 1066 } 1067 af->so_accept_filter = afp; 1068 so->so_accf = af; 1069 so->so_options |= SO_ACCEPTFILTER; 1070 out: 1071 if (afap != NULL) 1072 FREE(afap, M_TEMP); 1073 return (error); 1074 } 1075 #endif /* INET */ 1076 1077 /* 1078 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1079 * an additional variant to handle the case where the option value needs 1080 * to be some kind of integer, but not a specific size. 1081 * In addition to their use here, these functions are also called by the 1082 * protocol-level pr_ctloutput() routines. 1083 */ 1084 int 1085 sooptcopyin(sopt, buf, len, minlen) 1086 struct sockopt *sopt; 1087 void *buf; 1088 size_t len; 1089 size_t minlen; 1090 { 1091 size_t valsize; 1092 1093 /* 1094 * If the user gives us more than we wanted, we ignore it, 1095 * but if we don't get the minimum length the caller 1096 * wants, we return EINVAL. On success, sopt->sopt_valsize 1097 * is set to however much we actually retrieved. 1098 */ 1099 if ((valsize = sopt->sopt_valsize) < minlen) 1100 return EINVAL; 1101 if (valsize > len) 1102 sopt->sopt_valsize = valsize = len; 1103 1104 if (sopt->sopt_td != 0) 1105 return (copyin(sopt->sopt_val, buf, valsize)); 1106 1107 bcopy(sopt->sopt_val, buf, valsize); 1108 return 0; 1109 } 1110 1111 int 1112 sosetopt(so, sopt) 1113 struct socket *so; 1114 struct sockopt *sopt; 1115 { 1116 int error, optval; 1117 struct linger l; 1118 struct timeval tv; 1119 u_long val; 1120 1121 error = 0; 1122 if (sopt->sopt_level != SOL_SOCKET) { 1123 if (so->so_proto && so->so_proto->pr_ctloutput) 1124 return ((*so->so_proto->pr_ctloutput) 1125 (so, sopt)); 1126 error = ENOPROTOOPT; 1127 } else { 1128 switch (sopt->sopt_name) { 1129 #ifdef INET 1130 case SO_ACCEPTFILTER: 1131 error = do_setopt_accept_filter(so, sopt); 1132 if (error) 1133 goto bad; 1134 break; 1135 #endif 1136 case SO_LINGER: 1137 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1138 if (error) 1139 goto bad; 1140 1141 so->so_linger = l.l_linger; 1142 if (l.l_onoff) 1143 so->so_options |= SO_LINGER; 1144 else 1145 so->so_options &= ~SO_LINGER; 1146 break; 1147 1148 case SO_DEBUG: 1149 case SO_KEEPALIVE: 1150 case SO_DONTROUTE: 1151 case SO_USELOOPBACK: 1152 case SO_BROADCAST: 1153 case SO_REUSEADDR: 1154 case SO_REUSEPORT: 1155 case SO_OOBINLINE: 1156 case SO_TIMESTAMP: 1157 error = sooptcopyin(sopt, &optval, sizeof optval, 1158 sizeof optval); 1159 if (error) 1160 goto bad; 1161 if (optval) 1162 so->so_options |= sopt->sopt_name; 1163 else 1164 so->so_options &= ~sopt->sopt_name; 1165 break; 1166 1167 case SO_SNDBUF: 1168 case SO_RCVBUF: 1169 case SO_SNDLOWAT: 1170 case SO_RCVLOWAT: 1171 error = sooptcopyin(sopt, &optval, sizeof optval, 1172 sizeof optval); 1173 if (error) 1174 goto bad; 1175 1176 /* 1177 * Values < 1 make no sense for any of these 1178 * options, so disallow them. 1179 */ 1180 if (optval < 1) { 1181 error = EINVAL; 1182 goto bad; 1183 } 1184 1185 switch (sopt->sopt_name) { 1186 case SO_SNDBUF: 1187 case SO_RCVBUF: 1188 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1189 &so->so_snd : &so->so_rcv, (u_long)optval, 1190 so, curthread) == 0) { 1191 error = ENOBUFS; 1192 goto bad; 1193 } 1194 break; 1195 1196 /* 1197 * Make sure the low-water is never greater than 1198 * the high-water. 1199 */ 1200 case SO_SNDLOWAT: 1201 so->so_snd.sb_lowat = 1202 (optval > so->so_snd.sb_hiwat) ? 1203 so->so_snd.sb_hiwat : optval; 1204 break; 1205 case SO_RCVLOWAT: 1206 so->so_rcv.sb_lowat = 1207 (optval > so->so_rcv.sb_hiwat) ? 1208 so->so_rcv.sb_hiwat : optval; 1209 break; 1210 } 1211 break; 1212 1213 case SO_SNDTIMEO: 1214 case SO_RCVTIMEO: 1215 error = sooptcopyin(sopt, &tv, sizeof tv, 1216 sizeof tv); 1217 if (error) 1218 goto bad; 1219 1220 /* assert(hz > 0); */ 1221 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1222 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1223 error = EDOM; 1224 goto bad; 1225 } 1226 /* assert(tick > 0); */ 1227 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1228 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1229 if (val > SHRT_MAX) { 1230 error = EDOM; 1231 goto bad; 1232 } 1233 1234 switch (sopt->sopt_name) { 1235 case SO_SNDTIMEO: 1236 so->so_snd.sb_timeo = val; 1237 break; 1238 case SO_RCVTIMEO: 1239 so->so_rcv.sb_timeo = val; 1240 break; 1241 } 1242 break; 1243 default: 1244 error = ENOPROTOOPT; 1245 break; 1246 } 1247 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 1248 (void) ((*so->so_proto->pr_ctloutput) 1249 (so, sopt)); 1250 } 1251 } 1252 bad: 1253 return (error); 1254 } 1255 1256 /* Helper routine for getsockopt */ 1257 int 1258 sooptcopyout(sopt, buf, len) 1259 struct sockopt *sopt; 1260 void *buf; 1261 size_t len; 1262 { 1263 int error; 1264 size_t valsize; 1265 1266 error = 0; 1267 1268 /* 1269 * Documented get behavior is that we always return a value, 1270 * possibly truncated to fit in the user's buffer. 1271 * Traditional behavior is that we always tell the user 1272 * precisely how much we copied, rather than something useful 1273 * like the total amount we had available for her. 1274 * Note that this interface is not idempotent; the entire answer must 1275 * generated ahead of time. 1276 */ 1277 valsize = min(len, sopt->sopt_valsize); 1278 sopt->sopt_valsize = valsize; 1279 if (sopt->sopt_val != 0) { 1280 if (sopt->sopt_td != 0) 1281 error = copyout(buf, sopt->sopt_val, valsize); 1282 else 1283 bcopy(buf, sopt->sopt_val, valsize); 1284 } 1285 return error; 1286 } 1287 1288 int 1289 sogetopt(so, sopt) 1290 struct socket *so; 1291 struct sockopt *sopt; 1292 { 1293 int error, optval; 1294 struct linger l; 1295 struct timeval tv; 1296 #ifdef INET 1297 struct accept_filter_arg *afap; 1298 #endif 1299 1300 error = 0; 1301 if (sopt->sopt_level != SOL_SOCKET) { 1302 if (so->so_proto && so->so_proto->pr_ctloutput) { 1303 return ((*so->so_proto->pr_ctloutput) 1304 (so, sopt)); 1305 } else 1306 return (ENOPROTOOPT); 1307 } else { 1308 switch (sopt->sopt_name) { 1309 #ifdef INET 1310 case SO_ACCEPTFILTER: 1311 if ((so->so_options & SO_ACCEPTCONN) == 0) 1312 return (EINVAL); 1313 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1314 M_TEMP, M_WAITOK | M_ZERO); 1315 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1316 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1317 if (so->so_accf->so_accept_filter_str != NULL) 1318 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1319 } 1320 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1321 FREE(afap, M_TEMP); 1322 break; 1323 #endif 1324 1325 case SO_LINGER: 1326 l.l_onoff = so->so_options & SO_LINGER; 1327 l.l_linger = so->so_linger; 1328 error = sooptcopyout(sopt, &l, sizeof l); 1329 break; 1330 1331 case SO_USELOOPBACK: 1332 case SO_DONTROUTE: 1333 case SO_DEBUG: 1334 case SO_KEEPALIVE: 1335 case SO_REUSEADDR: 1336 case SO_REUSEPORT: 1337 case SO_BROADCAST: 1338 case SO_OOBINLINE: 1339 case SO_TIMESTAMP: 1340 optval = so->so_options & sopt->sopt_name; 1341 integer: 1342 error = sooptcopyout(sopt, &optval, sizeof optval); 1343 break; 1344 1345 case SO_TYPE: 1346 optval = so->so_type; 1347 goto integer; 1348 1349 case SO_ERROR: 1350 optval = so->so_error; 1351 so->so_error = 0; 1352 goto integer; 1353 1354 case SO_SNDBUF: 1355 optval = so->so_snd.sb_hiwat; 1356 goto integer; 1357 1358 case SO_RCVBUF: 1359 optval = so->so_rcv.sb_hiwat; 1360 goto integer; 1361 1362 case SO_SNDLOWAT: 1363 optval = so->so_snd.sb_lowat; 1364 goto integer; 1365 1366 case SO_RCVLOWAT: 1367 optval = so->so_rcv.sb_lowat; 1368 goto integer; 1369 1370 case SO_SNDTIMEO: 1371 case SO_RCVTIMEO: 1372 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1373 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1374 1375 tv.tv_sec = optval / hz; 1376 tv.tv_usec = (optval % hz) * tick; 1377 error = sooptcopyout(sopt, &tv, sizeof tv); 1378 break; 1379 1380 default: 1381 error = ENOPROTOOPT; 1382 break; 1383 } 1384 return (error); 1385 } 1386 } 1387 1388 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1389 int 1390 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1391 { 1392 struct mbuf *m, *m_prev; 1393 int sopt_size = sopt->sopt_valsize; 1394 1395 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1396 if (m == 0) 1397 return ENOBUFS; 1398 if (sopt_size > MLEN) { 1399 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1400 if ((m->m_flags & M_EXT) == 0) { 1401 m_free(m); 1402 return ENOBUFS; 1403 } 1404 m->m_len = min(MCLBYTES, sopt_size); 1405 } else { 1406 m->m_len = min(MLEN, sopt_size); 1407 } 1408 sopt_size -= m->m_len; 1409 *mp = m; 1410 m_prev = m; 1411 1412 while (sopt_size) { 1413 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1414 if (m == 0) { 1415 m_freem(*mp); 1416 return ENOBUFS; 1417 } 1418 if (sopt_size > MLEN) { 1419 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1420 if ((m->m_flags & M_EXT) == 0) { 1421 m_freem(*mp); 1422 return ENOBUFS; 1423 } 1424 m->m_len = min(MCLBYTES, sopt_size); 1425 } else { 1426 m->m_len = min(MLEN, sopt_size); 1427 } 1428 sopt_size -= m->m_len; 1429 m_prev->m_next = m; 1430 m_prev = m; 1431 } 1432 return 0; 1433 } 1434 1435 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1436 int 1437 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1438 { 1439 struct mbuf *m0 = m; 1440 1441 if (sopt->sopt_val == NULL) 1442 return 0; 1443 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1444 if (sopt->sopt_td != NULL) { 1445 int error; 1446 1447 error = copyin(sopt->sopt_val, mtod(m, char *), 1448 m->m_len); 1449 if (error != 0) { 1450 m_freem(m0); 1451 return(error); 1452 } 1453 } else 1454 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1455 sopt->sopt_valsize -= m->m_len; 1456 (caddr_t)sopt->sopt_val += m->m_len; 1457 m = m->m_next; 1458 } 1459 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1460 panic("ip6_sooptmcopyin"); 1461 return 0; 1462 } 1463 1464 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1465 int 1466 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1467 { 1468 struct mbuf *m0 = m; 1469 size_t valsize = 0; 1470 1471 if (sopt->sopt_val == NULL) 1472 return 0; 1473 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1474 if (sopt->sopt_td != NULL) { 1475 int error; 1476 1477 error = copyout(mtod(m, char *), sopt->sopt_val, 1478 m->m_len); 1479 if (error != 0) { 1480 m_freem(m0); 1481 return(error); 1482 } 1483 } else 1484 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1485 sopt->sopt_valsize -= m->m_len; 1486 (caddr_t)sopt->sopt_val += m->m_len; 1487 valsize += m->m_len; 1488 m = m->m_next; 1489 } 1490 if (m != NULL) { 1491 /* enough soopt buffer should be given from user-land */ 1492 m_freem(m0); 1493 return(EINVAL); 1494 } 1495 sopt->sopt_valsize = valsize; 1496 return 0; 1497 } 1498 1499 void 1500 sohasoutofband(so) 1501 register struct socket *so; 1502 { 1503 if (so->so_sigio != NULL) 1504 pgsigio(so->so_sigio, SIGURG, 0); 1505 selwakeup(&so->so_rcv.sb_sel); 1506 } 1507 1508 int 1509 sopoll(struct socket *so, int events, struct ucred *cred, struct thread *td) 1510 { 1511 int revents = 0; 1512 int s = splnet(); 1513 1514 if (events & (POLLIN | POLLRDNORM)) 1515 if (soreadable(so)) 1516 revents |= events & (POLLIN | POLLRDNORM); 1517 1518 if (events & (POLLOUT | POLLWRNORM)) 1519 if (sowriteable(so)) 1520 revents |= events & (POLLOUT | POLLWRNORM); 1521 1522 if (events & (POLLPRI | POLLRDBAND)) 1523 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1524 revents |= events & (POLLPRI | POLLRDBAND); 1525 1526 if (revents == 0) { 1527 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 1528 selrecord(td, &so->so_rcv.sb_sel); 1529 so->so_rcv.sb_flags |= SB_SEL; 1530 } 1531 1532 if (events & (POLLOUT | POLLWRNORM)) { 1533 selrecord(td, &so->so_snd.sb_sel); 1534 so->so_snd.sb_flags |= SB_SEL; 1535 } 1536 } 1537 1538 splx(s); 1539 return (revents); 1540 } 1541 1542 int 1543 sokqfilter(struct file *fp, struct knote *kn) 1544 { 1545 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1546 struct sockbuf *sb; 1547 int s; 1548 1549 switch (kn->kn_filter) { 1550 case EVFILT_READ: 1551 if (so->so_options & SO_ACCEPTCONN) 1552 kn->kn_fop = &solisten_filtops; 1553 else 1554 kn->kn_fop = &soread_filtops; 1555 sb = &so->so_rcv; 1556 break; 1557 case EVFILT_WRITE: 1558 kn->kn_fop = &sowrite_filtops; 1559 sb = &so->so_snd; 1560 break; 1561 default: 1562 return (1); 1563 } 1564 1565 s = splnet(); 1566 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1567 sb->sb_flags |= SB_KNOTE; 1568 splx(s); 1569 return (0); 1570 } 1571 1572 static void 1573 filt_sordetach(struct knote *kn) 1574 { 1575 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1576 int s = splnet(); 1577 1578 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1579 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1580 so->so_rcv.sb_flags &= ~SB_KNOTE; 1581 splx(s); 1582 } 1583 1584 /*ARGSUSED*/ 1585 static int 1586 filt_soread(struct knote *kn, long hint) 1587 { 1588 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1589 1590 kn->kn_data = so->so_rcv.sb_cc; 1591 if (so->so_state & SS_CANTRCVMORE) { 1592 kn->kn_flags |= EV_EOF; 1593 kn->kn_fflags = so->so_error; 1594 return (1); 1595 } 1596 if (so->so_error) /* temporary udp error */ 1597 return (1); 1598 if (kn->kn_sfflags & NOTE_LOWAT) 1599 return (kn->kn_data >= kn->kn_sdata); 1600 return (kn->kn_data >= so->so_rcv.sb_lowat); 1601 } 1602 1603 static void 1604 filt_sowdetach(struct knote *kn) 1605 { 1606 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1607 int s = splnet(); 1608 1609 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1610 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1611 so->so_snd.sb_flags &= ~SB_KNOTE; 1612 splx(s); 1613 } 1614 1615 /*ARGSUSED*/ 1616 static int 1617 filt_sowrite(struct knote *kn, long hint) 1618 { 1619 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1620 1621 kn->kn_data = sbspace(&so->so_snd); 1622 if (so->so_state & SS_CANTSENDMORE) { 1623 kn->kn_flags |= EV_EOF; 1624 kn->kn_fflags = so->so_error; 1625 return (1); 1626 } 1627 if (so->so_error) /* temporary udp error */ 1628 return (1); 1629 if (((so->so_state & SS_ISCONNECTED) == 0) && 1630 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1631 return (0); 1632 if (kn->kn_sfflags & NOTE_LOWAT) 1633 return (kn->kn_data >= kn->kn_sdata); 1634 return (kn->kn_data >= so->so_snd.sb_lowat); 1635 } 1636 1637 /*ARGSUSED*/ 1638 static int 1639 filt_solisten(struct knote *kn, long hint) 1640 { 1641 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1642 1643 kn->kn_data = so->so_qlen - so->so_incqlen; 1644 return (! TAILQ_EMPTY(&so->so_comp)); 1645 } 1646 1647 int 1648 socheckuid(struct socket *so, uid_t uid) 1649 { 1650 1651 if (so == NULL) 1652 return (EPERM); 1653 if (so->so_cred->cr_uid == uid) 1654 return (0); 1655 return (EPERM); 1656 } 1657