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 #include "opt_mac.h" 39 #include "opt_zero.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/fcntl.h> 44 #include <sys/lock.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/mutex.h> 49 #include <sys/domain.h> 50 #include <sys/file.h> /* for struct knote */ 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/event.h> 54 #include <sys/poll.h> 55 #include <sys/proc.h> 56 #include <sys/protosw.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/resourcevar.h> 60 #include <sys/signalvar.h> 61 #include <sys/sysctl.h> 62 #include <sys/uio.h> 63 #include <sys/jail.h> 64 65 #include <vm/uma.h> 66 67 #include <machine/limits.h> 68 69 #ifdef INET 70 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 71 #endif 72 73 static void filt_sordetach(struct knote *kn); 74 static int filt_soread(struct knote *kn, long hint); 75 static void filt_sowdetach(struct knote *kn); 76 static int filt_sowrite(struct knote *kn, long hint); 77 static int filt_solisten(struct knote *kn, long hint); 78 79 static struct filterops solisten_filtops = 80 { 1, NULL, filt_sordetach, filt_solisten }; 81 static struct filterops soread_filtops = 82 { 1, NULL, filt_sordetach, filt_soread }; 83 static struct filterops sowrite_filtops = 84 { 1, NULL, filt_sowdetach, filt_sowrite }; 85 86 uma_zone_t socket_zone; 87 so_gen_t so_gencnt; /* generation count for sockets */ 88 89 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 90 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 91 92 SYSCTL_DECL(_kern_ipc); 93 94 static int somaxconn = SOMAXCONN; 95 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 96 &somaxconn, 0, "Maximum pending socket connection queue size"); 97 static int numopensockets; 98 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD, 99 &numopensockets, 0, "Number of open sockets"); 100 #ifdef ZERO_COPY_SOCKETS 101 /* These aren't static because they're used in other files. */ 102 int so_zero_copy_send = 1; 103 int so_zero_copy_receive = 1; 104 SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0, 105 "Zero copy controls"); 106 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW, 107 &so_zero_copy_receive, 0, "Enable zero copy receive"); 108 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW, 109 &so_zero_copy_send, 0, "Enable zero copy send"); 110 #endif /* ZERO_COPY_SOCKETS */ 111 112 113 /* 114 * Socket operation routines. 115 * These routines are called by the routines in 116 * sys_socket.c or from a system process, and 117 * implement the semantics of socket operations by 118 * switching out to the protocol specific routines. 119 */ 120 121 /* 122 * Get a socket structure from our zone, and initialize it. 123 * Note that it would probably be better to allocate socket 124 * and PCB at the same time, but I'm not convinced that all 125 * the protocols can be easily modified to do this. 126 * 127 * soalloc() returns a socket with a ref count of 0. 128 */ 129 struct socket * 130 soalloc(waitok) 131 int waitok; 132 { 133 struct socket *so; 134 #ifdef MAC 135 int error; 136 #endif 137 int flag; 138 139 if (waitok == 1) 140 flag = M_WAITOK; 141 else 142 flag = M_NOWAIT; 143 flag |= M_ZERO; 144 so = uma_zalloc(socket_zone, flag); 145 if (so) { 146 #ifdef MAC 147 error = mac_init_socket(so, flag); 148 if (error != 0) { 149 uma_zfree(socket_zone, so); 150 so = NULL; 151 return so; 152 } 153 #endif 154 /* XXX race condition for reentrant kernel */ 155 so->so_gencnt = ++so_gencnt; 156 /* sx_init(&so->so_sxlock, "socket sxlock"); */ 157 TAILQ_INIT(&so->so_aiojobq); 158 ++numopensockets; 159 } 160 return so; 161 } 162 163 /* 164 * socreate returns a socket with a ref count of 1. The socket should be 165 * closed with soclose(). 166 */ 167 int 168 socreate(dom, aso, type, proto, cred, td) 169 int dom; 170 struct socket **aso; 171 register int type; 172 int proto; 173 struct ucred *cred; 174 struct thread *td; 175 { 176 register struct protosw *prp; 177 register struct socket *so; 178 register int error; 179 180 if (proto) 181 prp = pffindproto(dom, proto, type); 182 else 183 prp = pffindtype(dom, type); 184 185 if (prp == 0 || prp->pr_usrreqs->pru_attach == 0) 186 return (EPROTONOSUPPORT); 187 188 if (jailed(cred) && jail_socket_unixiproute_only && 189 prp->pr_domain->dom_family != PF_LOCAL && 190 prp->pr_domain->dom_family != PF_INET && 191 prp->pr_domain->dom_family != PF_ROUTE) { 192 return (EPROTONOSUPPORT); 193 } 194 195 if (prp->pr_type != type) 196 return (EPROTOTYPE); 197 so = soalloc(M_NOWAIT); 198 if (so == NULL) 199 return (ENOBUFS); 200 201 TAILQ_INIT(&so->so_incomp); 202 TAILQ_INIT(&so->so_comp); 203 so->so_type = type; 204 so->so_cred = crhold(cred); 205 so->so_proto = prp; 206 #ifdef MAC 207 mac_create_socket(cred, so); 208 #endif 209 soref(so); 210 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td); 211 if (error) { 212 so->so_state |= SS_NOFDREF; 213 sorele(so); 214 return (error); 215 } 216 *aso = so; 217 return (0); 218 } 219 220 int 221 sobind(so, nam, td) 222 struct socket *so; 223 struct sockaddr *nam; 224 struct thread *td; 225 { 226 int s = splnet(); 227 int error; 228 229 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td); 230 splx(s); 231 return (error); 232 } 233 234 static void 235 sodealloc(struct socket *so) 236 { 237 238 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count)); 239 so->so_gencnt = ++so_gencnt; 240 if (so->so_rcv.sb_hiwat) 241 (void)chgsbsize(so->so_cred->cr_uidinfo, 242 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY); 243 if (so->so_snd.sb_hiwat) 244 (void)chgsbsize(so->so_cred->cr_uidinfo, 245 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY); 246 #ifdef INET 247 if (so->so_accf != NULL) { 248 if (so->so_accf->so_accept_filter != NULL && 249 so->so_accf->so_accept_filter->accf_destroy != NULL) { 250 so->so_accf->so_accept_filter->accf_destroy(so); 251 } 252 if (so->so_accf->so_accept_filter_str != NULL) 253 FREE(so->so_accf->so_accept_filter_str, M_ACCF); 254 FREE(so->so_accf, M_ACCF); 255 } 256 #endif 257 #ifdef MAC 258 mac_destroy_socket(so); 259 #endif 260 crfree(so->so_cred); 261 /* sx_destroy(&so->so_sxlock); */ 262 uma_zfree(socket_zone, so); 263 --numopensockets; 264 } 265 266 int 267 solisten(so, backlog, td) 268 register struct socket *so; 269 int backlog; 270 struct thread *td; 271 { 272 int s, error; 273 274 s = splnet(); 275 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td); 276 if (error) { 277 splx(s); 278 return (error); 279 } 280 if (TAILQ_EMPTY(&so->so_comp)) 281 so->so_options |= SO_ACCEPTCONN; 282 if (backlog < 0 || backlog > somaxconn) 283 backlog = somaxconn; 284 so->so_qlimit = backlog; 285 splx(s); 286 return (0); 287 } 288 289 void 290 sofree(so) 291 register struct socket *so; 292 { 293 struct socket *head = so->so_head; 294 295 KASSERT(so->so_count == 0, ("socket %p so_count not 0", so)); 296 297 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 298 return; 299 if (head != NULL) { 300 if (so->so_state & SS_INCOMP) { 301 TAILQ_REMOVE(&head->so_incomp, so, so_list); 302 head->so_incqlen--; 303 } else if (so->so_state & SS_COMP) { 304 /* 305 * We must not decommission a socket that's 306 * on the accept(2) queue. If we do, then 307 * accept(2) may hang after select(2) indicated 308 * that the listening socket was ready. 309 */ 310 return; 311 } else { 312 panic("sofree: not queued"); 313 } 314 so->so_state &= ~SS_INCOMP; 315 so->so_head = NULL; 316 } 317 sbrelease(&so->so_snd, so); 318 sorflush(so); 319 sodealloc(so); 320 } 321 322 /* 323 * Close a socket on last file table reference removal. 324 * Initiate disconnect if connected. 325 * Free socket when disconnect complete. 326 * 327 * This function will sorele() the socket. Note that soclose() may be 328 * called prior to the ref count reaching zero. The actual socket 329 * structure will not be freed until the ref count reaches zero. 330 */ 331 int 332 soclose(so) 333 register struct socket *so; 334 { 335 int s = splnet(); /* conservative */ 336 int error = 0; 337 338 funsetown(&so->so_sigio); 339 if (so->so_options & SO_ACCEPTCONN) { 340 struct socket *sp, *sonext; 341 342 sp = TAILQ_FIRST(&so->so_incomp); 343 for (; sp != NULL; sp = sonext) { 344 sonext = TAILQ_NEXT(sp, so_list); 345 (void) soabort(sp); 346 } 347 for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) { 348 sonext = TAILQ_NEXT(sp, so_list); 349 /* Dequeue from so_comp since sofree() won't do it */ 350 TAILQ_REMOVE(&so->so_comp, sp, so_list); 351 so->so_qlen--; 352 sp->so_state &= ~SS_COMP; 353 sp->so_head = NULL; 354 (void) soabort(sp); 355 } 356 } 357 if (so->so_pcb == 0) 358 goto discard; 359 if (so->so_state & SS_ISCONNECTED) { 360 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 361 error = sodisconnect(so); 362 if (error) 363 goto drop; 364 } 365 if (so->so_options & SO_LINGER) { 366 if ((so->so_state & SS_ISDISCONNECTING) && 367 (so->so_state & SS_NBIO)) 368 goto drop; 369 while (so->so_state & SS_ISCONNECTED) { 370 error = tsleep(&so->so_timeo, 371 PSOCK | PCATCH, "soclos", so->so_linger * hz); 372 if (error) 373 break; 374 } 375 } 376 } 377 drop: 378 if (so->so_pcb) { 379 int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); 380 if (error == 0) 381 error = error2; 382 } 383 discard: 384 if (so->so_state & SS_NOFDREF) 385 panic("soclose: NOFDREF"); 386 so->so_state |= SS_NOFDREF; 387 sorele(so); 388 splx(s); 389 return (error); 390 } 391 392 /* 393 * Must be called at splnet... 394 */ 395 int 396 soabort(so) 397 struct socket *so; 398 { 399 int error; 400 401 error = (*so->so_proto->pr_usrreqs->pru_abort)(so); 402 if (error) { 403 sotryfree(so); /* note: does not decrement the ref count */ 404 return error; 405 } 406 return (0); 407 } 408 409 int 410 soaccept(so, nam) 411 register struct socket *so; 412 struct sockaddr **nam; 413 { 414 int s = splnet(); 415 int error; 416 417 if ((so->so_state & SS_NOFDREF) == 0) 418 panic("soaccept: !NOFDREF"); 419 so->so_state &= ~SS_NOFDREF; 420 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam); 421 splx(s); 422 return (error); 423 } 424 425 int 426 soconnect(so, nam, td) 427 register struct socket *so; 428 struct sockaddr *nam; 429 struct thread *td; 430 { 431 int s; 432 int error; 433 434 if (so->so_options & SO_ACCEPTCONN) 435 return (EOPNOTSUPP); 436 s = splnet(); 437 /* 438 * If protocol is connection-based, can only connect once. 439 * Otherwise, if connected, try to disconnect first. 440 * This allows user to disconnect by connecting to, e.g., 441 * a null address. 442 */ 443 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 444 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 445 (error = sodisconnect(so)))) 446 error = EISCONN; 447 else 448 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td); 449 splx(s); 450 return (error); 451 } 452 453 int 454 soconnect2(so1, so2) 455 register struct socket *so1; 456 struct socket *so2; 457 { 458 int s = splnet(); 459 int error; 460 461 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2); 462 splx(s); 463 return (error); 464 } 465 466 int 467 sodisconnect(so) 468 register struct socket *so; 469 { 470 int s = splnet(); 471 int error; 472 473 if ((so->so_state & SS_ISCONNECTED) == 0) { 474 error = ENOTCONN; 475 goto bad; 476 } 477 if (so->so_state & SS_ISDISCONNECTING) { 478 error = EALREADY; 479 goto bad; 480 } 481 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so); 482 bad: 483 splx(s); 484 return (error); 485 } 486 487 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 488 /* 489 * Send on a socket. 490 * If send must go all at once and message is larger than 491 * send buffering, then hard error. 492 * Lock against other senders. 493 * If must go all at once and not enough room now, then 494 * inform user that this would block and do nothing. 495 * Otherwise, if nonblocking, send as much as possible. 496 * The data to be sent is described by "uio" if nonzero, 497 * otherwise by the mbuf chain "top" (which must be null 498 * if uio is not). Data provided in mbuf chain must be small 499 * enough to send all at once. 500 * 501 * Returns nonzero on error, timeout or signal; callers 502 * must check for short counts if EINTR/ERESTART are returned. 503 * Data and control buffers are freed on return. 504 */ 505 506 #ifdef ZERO_COPY_SOCKETS 507 struct so_zerocopy_stats{ 508 int size_ok; 509 int align_ok; 510 int found_ifp; 511 }; 512 struct so_zerocopy_stats so_zerocp_stats = {0,0,0}; 513 #include <netinet/in.h> 514 #include <net/route.h> 515 #include <netinet/in_pcb.h> 516 #include <vm/vm.h> 517 #include <vm/vm_page.h> 518 #include <vm/vm_object.h> 519 #endif /*ZERO_COPY_SOCKETS*/ 520 521 int 522 sosend(so, addr, uio, top, control, flags, td) 523 register struct socket *so; 524 struct sockaddr *addr; 525 struct uio *uio; 526 struct mbuf *top; 527 struct mbuf *control; 528 int flags; 529 struct thread *td; 530 { 531 struct mbuf **mp; 532 register struct mbuf *m; 533 register long space, len, resid; 534 int clen = 0, error, s, dontroute, mlen; 535 int atomic = sosendallatonce(so) || top; 536 #ifdef ZERO_COPY_SOCKETS 537 int cow_send; 538 #endif /* ZERO_COPY_SOCKETS */ 539 540 if (uio) 541 resid = uio->uio_resid; 542 else 543 resid = top->m_pkthdr.len; 544 /* 545 * In theory resid should be unsigned. 546 * However, space must be signed, as it might be less than 0 547 * if we over-committed, and we must use a signed comparison 548 * of space and resid. On the other hand, a negative resid 549 * causes us to loop sending 0-length segments to the protocol. 550 * 551 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM 552 * type sockets since that's an error. 553 */ 554 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { 555 error = EINVAL; 556 goto out; 557 } 558 559 dontroute = 560 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 561 (so->so_proto->pr_flags & PR_ATOMIC); 562 if (td) 563 td->td_proc->p_stats->p_ru.ru_msgsnd++; 564 if (control) 565 clen = control->m_len; 566 #define snderr(errno) { error = errno; splx(s); goto release; } 567 568 restart: 569 error = sblock(&so->so_snd, SBLOCKWAIT(flags)); 570 if (error) 571 goto out; 572 do { 573 s = splnet(); 574 if (so->so_state & SS_CANTSENDMORE) 575 snderr(EPIPE); 576 if (so->so_error) { 577 error = so->so_error; 578 so->so_error = 0; 579 splx(s); 580 goto release; 581 } 582 if ((so->so_state & SS_ISCONNECTED) == 0) { 583 /* 584 * `sendto' and `sendmsg' is allowed on a connection- 585 * based socket if it supports implied connect. 586 * Return ENOTCONN if not connected and no address is 587 * supplied. 588 */ 589 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && 590 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { 591 if ((so->so_state & SS_ISCONFIRMING) == 0 && 592 !(resid == 0 && clen != 0)) 593 snderr(ENOTCONN); 594 } else if (addr == 0) 595 snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ? 596 ENOTCONN : EDESTADDRREQ); 597 } 598 space = sbspace(&so->so_snd); 599 if (flags & MSG_OOB) 600 space += 1024; 601 if ((atomic && resid > so->so_snd.sb_hiwat) || 602 clen > so->so_snd.sb_hiwat) 603 snderr(EMSGSIZE); 604 if (space < resid + clen && 605 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 606 if (so->so_state & SS_NBIO) 607 snderr(EWOULDBLOCK); 608 sbunlock(&so->so_snd); 609 error = sbwait(&so->so_snd); 610 splx(s); 611 if (error) 612 goto out; 613 goto restart; 614 } 615 splx(s); 616 mp = ⊤ 617 space -= clen; 618 do { 619 if (uio == NULL) { 620 /* 621 * Data is prepackaged in "top". 622 */ 623 resid = 0; 624 if (flags & MSG_EOR) 625 top->m_flags |= M_EOR; 626 } else do { 627 #ifdef ZERO_COPY_SOCKETS 628 cow_send = 0; 629 #endif /* ZERO_COPY_SOCKETS */ 630 if (top == 0) { 631 MGETHDR(m, M_TRYWAIT, MT_DATA); 632 if (m == NULL) { 633 error = ENOBUFS; 634 goto release; 635 } 636 mlen = MHLEN; 637 m->m_pkthdr.len = 0; 638 m->m_pkthdr.rcvif = (struct ifnet *)0; 639 } else { 640 MGET(m, M_TRYWAIT, MT_DATA); 641 if (m == NULL) { 642 error = ENOBUFS; 643 goto release; 644 } 645 mlen = MLEN; 646 } 647 if (resid >= MINCLSIZE) { 648 #ifdef ZERO_COPY_SOCKETS 649 if (so_zero_copy_send && 650 resid>=PAGE_SIZE && 651 space>=PAGE_SIZE && 652 uio->uio_iov->iov_len>=PAGE_SIZE) { 653 so_zerocp_stats.size_ok++; 654 if (!((vm_offset_t) 655 uio->uio_iov->iov_base & PAGE_MASK)){ 656 so_zerocp_stats.align_ok++; 657 cow_send = socow_setup(m, uio); 658 } 659 } 660 if (!cow_send){ 661 #endif /* ZERO_COPY_SOCKETS */ 662 MCLGET(m, M_TRYWAIT); 663 if ((m->m_flags & M_EXT) == 0) 664 goto nopages; 665 mlen = MCLBYTES; 666 len = min(min(mlen, resid), space); 667 } else { 668 #ifdef ZERO_COPY_SOCKETS 669 len = PAGE_SIZE; 670 } 671 672 } else { 673 #endif /* ZERO_COPY_SOCKETS */ 674 nopages: 675 len = min(min(mlen, resid), space); 676 /* 677 * For datagram protocols, leave room 678 * for protocol headers in first mbuf. 679 */ 680 if (atomic && top == 0 && len < mlen) 681 MH_ALIGN(m, len); 682 } 683 space -= len; 684 #ifdef ZERO_COPY_SOCKETS 685 if (cow_send) 686 error = 0; 687 else 688 #endif /* ZERO_COPY_SOCKETS */ 689 error = uiomove(mtod(m, caddr_t), (int)len, uio); 690 resid = uio->uio_resid; 691 m->m_len = len; 692 *mp = m; 693 top->m_pkthdr.len += len; 694 if (error) 695 goto release; 696 mp = &m->m_next; 697 if (resid <= 0) { 698 if (flags & MSG_EOR) 699 top->m_flags |= M_EOR; 700 break; 701 } 702 } while (space > 0 && atomic); 703 if (dontroute) 704 so->so_options |= SO_DONTROUTE; 705 s = splnet(); /* XXX */ 706 /* 707 * XXX all the SS_CANTSENDMORE checks previously 708 * done could be out of date. We could have recieved 709 * a reset packet in an interrupt or maybe we slept 710 * while doing page faults in uiomove() etc. We could 711 * probably recheck again inside the splnet() protection 712 * here, but there are probably other places that this 713 * also happens. We must rethink this. 714 */ 715 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 716 (flags & MSG_OOB) ? PRUS_OOB : 717 /* 718 * If the user set MSG_EOF, the protocol 719 * understands this flag and nothing left to 720 * send then use PRU_SEND_EOF instead of PRU_SEND. 721 */ 722 ((flags & MSG_EOF) && 723 (so->so_proto->pr_flags & PR_IMPLOPCL) && 724 (resid <= 0)) ? 725 PRUS_EOF : 726 /* If there is more to send set PRUS_MORETOCOME */ 727 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0, 728 top, addr, control, td); 729 splx(s); 730 if (dontroute) 731 so->so_options &= ~SO_DONTROUTE; 732 clen = 0; 733 control = 0; 734 top = 0; 735 mp = ⊤ 736 if (error) 737 goto release; 738 } while (resid && space > 0); 739 } while (resid); 740 741 release: 742 sbunlock(&so->so_snd); 743 out: 744 if (top) 745 m_freem(top); 746 if (control) 747 m_freem(control); 748 return (error); 749 } 750 751 /* 752 * Implement receive operations on a socket. 753 * We depend on the way that records are added to the sockbuf 754 * by sbappend*. In particular, each record (mbufs linked through m_next) 755 * must begin with an address if the protocol so specifies, 756 * followed by an optional mbuf or mbufs containing ancillary data, 757 * and then zero or more mbufs of data. 758 * In order to avoid blocking network interrupts for the entire time here, 759 * we splx() while doing the actual copy to user space. 760 * Although the sockbuf is locked, new data may still be appended, 761 * and thus we must maintain consistency of the sockbuf during that time. 762 * 763 * The caller may receive the data as a single mbuf chain by supplying 764 * an mbuf **mp0 for use in returning the chain. The uio is then used 765 * only for the count in uio_resid. 766 */ 767 int 768 soreceive(so, psa, uio, mp0, controlp, flagsp) 769 register struct socket *so; 770 struct sockaddr **psa; 771 struct uio *uio; 772 struct mbuf **mp0; 773 struct mbuf **controlp; 774 int *flagsp; 775 { 776 struct mbuf *m, **mp; 777 register int flags, len, error, s, offset; 778 struct protosw *pr = so->so_proto; 779 struct mbuf *nextrecord; 780 int moff, type = 0; 781 int orig_resid = uio->uio_resid; 782 783 mp = mp0; 784 if (psa) 785 *psa = 0; 786 if (controlp) 787 *controlp = 0; 788 if (flagsp) 789 flags = *flagsp &~ MSG_EOR; 790 else 791 flags = 0; 792 if (flags & MSG_OOB) { 793 m = m_get(M_TRYWAIT, MT_DATA); 794 if (m == NULL) 795 return (ENOBUFS); 796 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); 797 if (error) 798 goto bad; 799 do { 800 #ifdef ZERO_COPY_SOCKETS 801 if (so_zero_copy_receive) { 802 vm_page_t pg; 803 int disposable; 804 805 if ((m->m_flags & M_EXT) 806 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 807 disposable = 1; 808 else 809 disposable = 0; 810 811 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t))); 812 if (uio->uio_offset == -1) 813 uio->uio_offset =IDX_TO_OFF(pg->pindex); 814 815 error = uiomoveco(mtod(m, caddr_t), 816 min(uio->uio_resid, m->m_len), 817 uio, pg->object, 818 disposable); 819 } else 820 #endif /* ZERO_COPY_SOCKETS */ 821 error = uiomove(mtod(m, caddr_t), 822 (int) min(uio->uio_resid, m->m_len), uio); 823 m = m_free(m); 824 } while (uio->uio_resid && error == 0 && m); 825 bad: 826 if (m) 827 m_freem(m); 828 return (error); 829 } 830 if (mp) 831 *mp = (struct mbuf *)0; 832 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 833 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 834 835 restart: 836 error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); 837 if (error) 838 return (error); 839 s = splnet(); 840 841 m = so->so_rcv.sb_mb; 842 /* 843 * If we have less data than requested, block awaiting more 844 * (subject to any timeout) if: 845 * 1. the current count is less than the low water mark, or 846 * 2. MSG_WAITALL is set, and it is possible to do the entire 847 * receive operation at once if we block (resid <= hiwat). 848 * 3. MSG_DONTWAIT is not set 849 * If MSG_WAITALL is set but resid is larger than the receive buffer, 850 * we have to do the receive in sections, and thus risk returning 851 * a short count if a timeout or signal occurs after we start. 852 */ 853 if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && 854 so->so_rcv.sb_cc < uio->uio_resid) && 855 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 856 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 857 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 858 KASSERT(m != 0 || !so->so_rcv.sb_cc, 859 ("receive: m == %p so->so_rcv.sb_cc == %u", 860 m, so->so_rcv.sb_cc)); 861 if (so->so_error) { 862 if (m) 863 goto dontblock; 864 error = so->so_error; 865 if ((flags & MSG_PEEK) == 0) 866 so->so_error = 0; 867 goto release; 868 } 869 if (so->so_state & SS_CANTRCVMORE) { 870 if (m) 871 goto dontblock; 872 else 873 goto release; 874 } 875 for (; m; m = m->m_next) 876 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 877 m = so->so_rcv.sb_mb; 878 goto dontblock; 879 } 880 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 881 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 882 error = ENOTCONN; 883 goto release; 884 } 885 if (uio->uio_resid == 0) 886 goto release; 887 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 888 error = EWOULDBLOCK; 889 goto release; 890 } 891 sbunlock(&so->so_rcv); 892 error = sbwait(&so->so_rcv); 893 splx(s); 894 if (error) 895 return (error); 896 goto restart; 897 } 898 dontblock: 899 if (uio->uio_td) 900 uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++; 901 nextrecord = m->m_nextpkt; 902 if (pr->pr_flags & PR_ADDR) { 903 KASSERT(m->m_type == MT_SONAME, 904 ("m->m_type == %d", m->m_type)); 905 orig_resid = 0; 906 if (psa) 907 *psa = dup_sockaddr(mtod(m, struct sockaddr *), 908 mp0 == 0); 909 if (flags & MSG_PEEK) { 910 m = m->m_next; 911 } else { 912 sbfree(&so->so_rcv, m); 913 so->so_rcv.sb_mb = m_free(m); 914 m = so->so_rcv.sb_mb; 915 } 916 } 917 while (m && m->m_type == MT_CONTROL && error == 0) { 918 if (flags & MSG_PEEK) { 919 if (controlp) 920 *controlp = m_copy(m, 0, m->m_len); 921 m = m->m_next; 922 } else { 923 sbfree(&so->so_rcv, m); 924 so->so_rcv.sb_mb = m->m_next; 925 m->m_next = NULL; 926 if (pr->pr_domain->dom_externalize) 927 error = 928 (*pr->pr_domain->dom_externalize)(m, controlp); 929 else if (controlp) 930 *controlp = m; 931 else 932 m_freem(m); 933 m = so->so_rcv.sb_mb; 934 } 935 if (controlp) { 936 orig_resid = 0; 937 do 938 controlp = &(*controlp)->m_next; 939 while (*controlp != NULL); 940 } 941 } 942 if (m) { 943 if ((flags & MSG_PEEK) == 0) 944 m->m_nextpkt = nextrecord; 945 type = m->m_type; 946 if (type == MT_OOBDATA) 947 flags |= MSG_OOB; 948 } 949 moff = 0; 950 offset = 0; 951 while (m && uio->uio_resid > 0 && error == 0) { 952 if (m->m_type == MT_OOBDATA) { 953 if (type != MT_OOBDATA) 954 break; 955 } else if (type == MT_OOBDATA) 956 break; 957 else 958 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 959 ("m->m_type == %d", m->m_type)); 960 so->so_state &= ~SS_RCVATMARK; 961 len = uio->uio_resid; 962 if (so->so_oobmark && len > so->so_oobmark - offset) 963 len = so->so_oobmark - offset; 964 if (len > m->m_len - moff) 965 len = m->m_len - moff; 966 /* 967 * If mp is set, just pass back the mbufs. 968 * Otherwise copy them out via the uio, then free. 969 * Sockbuf must be consistent here (points to current mbuf, 970 * it points to next record) when we drop priority; 971 * we must note any additions to the sockbuf when we 972 * block interrupts again. 973 */ 974 if (mp == 0) { 975 splx(s); 976 #ifdef ZERO_COPY_SOCKETS 977 if (so_zero_copy_receive) { 978 vm_page_t pg; 979 int disposable; 980 981 if ((m->m_flags & M_EXT) 982 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 983 disposable = 1; 984 else 985 disposable = 0; 986 987 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) + 988 moff)); 989 990 if (uio->uio_offset == -1) 991 uio->uio_offset =IDX_TO_OFF(pg->pindex); 992 993 error = uiomoveco(mtod(m, caddr_t) + moff, 994 (int)len, uio,pg->object, 995 disposable); 996 } else 997 #endif /* ZERO_COPY_SOCKETS */ 998 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 999 s = splnet(); 1000 if (error) 1001 goto release; 1002 } else 1003 uio->uio_resid -= len; 1004 if (len == m->m_len - moff) { 1005 if (m->m_flags & M_EOR) 1006 flags |= MSG_EOR; 1007 if (flags & MSG_PEEK) { 1008 m = m->m_next; 1009 moff = 0; 1010 } else { 1011 nextrecord = m->m_nextpkt; 1012 sbfree(&so->so_rcv, m); 1013 if (mp) { 1014 *mp = m; 1015 mp = &m->m_next; 1016 so->so_rcv.sb_mb = m = m->m_next; 1017 *mp = (struct mbuf *)0; 1018 } else { 1019 so->so_rcv.sb_mb = m_free(m); 1020 m = so->so_rcv.sb_mb; 1021 } 1022 if (m) 1023 m->m_nextpkt = nextrecord; 1024 } 1025 } else { 1026 if (flags & MSG_PEEK) 1027 moff += len; 1028 else { 1029 if (mp) 1030 *mp = m_copym(m, 0, len, M_TRYWAIT); 1031 m->m_data += len; 1032 m->m_len -= len; 1033 so->so_rcv.sb_cc -= len; 1034 } 1035 } 1036 if (so->so_oobmark) { 1037 if ((flags & MSG_PEEK) == 0) { 1038 so->so_oobmark -= len; 1039 if (so->so_oobmark == 0) { 1040 so->so_state |= SS_RCVATMARK; 1041 break; 1042 } 1043 } else { 1044 offset += len; 1045 if (offset == so->so_oobmark) 1046 break; 1047 } 1048 } 1049 if (flags & MSG_EOR) 1050 break; 1051 /* 1052 * If the MSG_WAITALL flag is set (for non-atomic socket), 1053 * we must not quit until "uio->uio_resid == 0" or an error 1054 * termination. If a signal/timeout occurs, return 1055 * with a short count but without error. 1056 * Keep sockbuf locked against other readers. 1057 */ 1058 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 1059 !sosendallatonce(so) && !nextrecord) { 1060 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1061 break; 1062 /* 1063 * Notify the protocol that some data has been 1064 * drained before blocking. 1065 */ 1066 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1067 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1068 error = sbwait(&so->so_rcv); 1069 if (error) { 1070 sbunlock(&so->so_rcv); 1071 splx(s); 1072 return (0); 1073 } 1074 m = so->so_rcv.sb_mb; 1075 if (m) 1076 nextrecord = m->m_nextpkt; 1077 } 1078 } 1079 1080 if (m && pr->pr_flags & PR_ATOMIC) { 1081 flags |= MSG_TRUNC; 1082 if ((flags & MSG_PEEK) == 0) 1083 (void) sbdroprecord(&so->so_rcv); 1084 } 1085 if ((flags & MSG_PEEK) == 0) { 1086 if (m == 0) 1087 so->so_rcv.sb_mb = nextrecord; 1088 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1089 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1090 } 1091 if (orig_resid == uio->uio_resid && orig_resid && 1092 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1093 sbunlock(&so->so_rcv); 1094 splx(s); 1095 goto restart; 1096 } 1097 1098 if (flagsp) 1099 *flagsp |= flags; 1100 release: 1101 sbunlock(&so->so_rcv); 1102 splx(s); 1103 return (error); 1104 } 1105 1106 int 1107 soshutdown(so, how) 1108 register struct socket *so; 1109 register int how; 1110 { 1111 register struct protosw *pr = so->so_proto; 1112 1113 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1114 return (EINVAL); 1115 1116 if (how != SHUT_WR) 1117 sorflush(so); 1118 if (how != SHUT_RD) 1119 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 1120 return (0); 1121 } 1122 1123 void 1124 sorflush(so) 1125 register struct socket *so; 1126 { 1127 register struct sockbuf *sb = &so->so_rcv; 1128 register struct protosw *pr = so->so_proto; 1129 register int s; 1130 struct sockbuf asb; 1131 1132 sb->sb_flags |= SB_NOINTR; 1133 (void) sblock(sb, M_WAITOK); 1134 s = splimp(); 1135 socantrcvmore(so); 1136 sbunlock(sb); 1137 asb = *sb; 1138 bzero(sb, sizeof (*sb)); 1139 splx(s); 1140 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 1141 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1142 sbrelease(&asb, so); 1143 } 1144 1145 #ifdef INET 1146 static int 1147 do_setopt_accept_filter(so, sopt) 1148 struct socket *so; 1149 struct sockopt *sopt; 1150 { 1151 struct accept_filter_arg *afap = NULL; 1152 struct accept_filter *afp; 1153 struct so_accf *af = so->so_accf; 1154 int error = 0; 1155 1156 /* do not set/remove accept filters on non listen sockets */ 1157 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1158 error = EINVAL; 1159 goto out; 1160 } 1161 1162 /* removing the filter */ 1163 if (sopt == NULL) { 1164 if (af != NULL) { 1165 if (af->so_accept_filter != NULL && 1166 af->so_accept_filter->accf_destroy != NULL) { 1167 af->so_accept_filter->accf_destroy(so); 1168 } 1169 if (af->so_accept_filter_str != NULL) { 1170 FREE(af->so_accept_filter_str, M_ACCF); 1171 } 1172 FREE(af, M_ACCF); 1173 so->so_accf = NULL; 1174 } 1175 so->so_options &= ~SO_ACCEPTFILTER; 1176 return (0); 1177 } 1178 /* adding a filter */ 1179 /* must remove previous filter first */ 1180 if (af != NULL) { 1181 error = EINVAL; 1182 goto out; 1183 } 1184 /* don't put large objects on the kernel stack */ 1185 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1186 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1187 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1188 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1189 if (error) 1190 goto out; 1191 afp = accept_filt_get(afap->af_name); 1192 if (afp == NULL) { 1193 error = ENOENT; 1194 goto out; 1195 } 1196 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1197 if (afp->accf_create != NULL) { 1198 if (afap->af_name[0] != '\0') { 1199 int len = strlen(afap->af_name) + 1; 1200 1201 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1202 strcpy(af->so_accept_filter_str, afap->af_name); 1203 } 1204 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1205 if (af->so_accept_filter_arg == NULL) { 1206 FREE(af->so_accept_filter_str, M_ACCF); 1207 FREE(af, M_ACCF); 1208 so->so_accf = NULL; 1209 error = EINVAL; 1210 goto out; 1211 } 1212 } 1213 af->so_accept_filter = afp; 1214 so->so_accf = af; 1215 so->so_options |= SO_ACCEPTFILTER; 1216 out: 1217 if (afap != NULL) 1218 FREE(afap, M_TEMP); 1219 return (error); 1220 } 1221 #endif /* INET */ 1222 1223 /* 1224 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1225 * an additional variant to handle the case where the option value needs 1226 * to be some kind of integer, but not a specific size. 1227 * In addition to their use here, these functions are also called by the 1228 * protocol-level pr_ctloutput() routines. 1229 */ 1230 int 1231 sooptcopyin(sopt, buf, len, minlen) 1232 struct sockopt *sopt; 1233 void *buf; 1234 size_t len; 1235 size_t minlen; 1236 { 1237 size_t valsize; 1238 1239 /* 1240 * If the user gives us more than we wanted, we ignore it, 1241 * but if we don't get the minimum length the caller 1242 * wants, we return EINVAL. On success, sopt->sopt_valsize 1243 * is set to however much we actually retrieved. 1244 */ 1245 if ((valsize = sopt->sopt_valsize) < minlen) 1246 return EINVAL; 1247 if (valsize > len) 1248 sopt->sopt_valsize = valsize = len; 1249 1250 if (sopt->sopt_td != 0) 1251 return (copyin(sopt->sopt_val, buf, valsize)); 1252 1253 bcopy(sopt->sopt_val, buf, valsize); 1254 return 0; 1255 } 1256 1257 int 1258 sosetopt(so, sopt) 1259 struct socket *so; 1260 struct sockopt *sopt; 1261 { 1262 int error, optval; 1263 struct linger l; 1264 struct timeval tv; 1265 u_long val; 1266 #ifdef MAC 1267 struct mac extmac; 1268 #endif /* MAC */ 1269 1270 error = 0; 1271 if (sopt->sopt_level != SOL_SOCKET) { 1272 if (so->so_proto && so->so_proto->pr_ctloutput) 1273 return ((*so->so_proto->pr_ctloutput) 1274 (so, sopt)); 1275 error = ENOPROTOOPT; 1276 } else { 1277 switch (sopt->sopt_name) { 1278 #ifdef INET 1279 case SO_ACCEPTFILTER: 1280 error = do_setopt_accept_filter(so, sopt); 1281 if (error) 1282 goto bad; 1283 break; 1284 #endif 1285 case SO_LINGER: 1286 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1287 if (error) 1288 goto bad; 1289 1290 so->so_linger = l.l_linger; 1291 if (l.l_onoff) 1292 so->so_options |= SO_LINGER; 1293 else 1294 so->so_options &= ~SO_LINGER; 1295 break; 1296 1297 case SO_DEBUG: 1298 case SO_KEEPALIVE: 1299 case SO_DONTROUTE: 1300 case SO_USELOOPBACK: 1301 case SO_BROADCAST: 1302 case SO_REUSEADDR: 1303 case SO_REUSEPORT: 1304 case SO_OOBINLINE: 1305 case SO_TIMESTAMP: 1306 case SO_NOSIGPIPE: 1307 error = sooptcopyin(sopt, &optval, sizeof optval, 1308 sizeof optval); 1309 if (error) 1310 goto bad; 1311 if (optval) 1312 so->so_options |= sopt->sopt_name; 1313 else 1314 so->so_options &= ~sopt->sopt_name; 1315 break; 1316 1317 case SO_SNDBUF: 1318 case SO_RCVBUF: 1319 case SO_SNDLOWAT: 1320 case SO_RCVLOWAT: 1321 error = sooptcopyin(sopt, &optval, sizeof optval, 1322 sizeof optval); 1323 if (error) 1324 goto bad; 1325 1326 /* 1327 * Values < 1 make no sense for any of these 1328 * options, so disallow them. 1329 */ 1330 if (optval < 1) { 1331 error = EINVAL; 1332 goto bad; 1333 } 1334 1335 switch (sopt->sopt_name) { 1336 case SO_SNDBUF: 1337 case SO_RCVBUF: 1338 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1339 &so->so_snd : &so->so_rcv, (u_long)optval, 1340 so, curthread) == 0) { 1341 error = ENOBUFS; 1342 goto bad; 1343 } 1344 break; 1345 1346 /* 1347 * Make sure the low-water is never greater than 1348 * the high-water. 1349 */ 1350 case SO_SNDLOWAT: 1351 so->so_snd.sb_lowat = 1352 (optval > so->so_snd.sb_hiwat) ? 1353 so->so_snd.sb_hiwat : optval; 1354 break; 1355 case SO_RCVLOWAT: 1356 so->so_rcv.sb_lowat = 1357 (optval > so->so_rcv.sb_hiwat) ? 1358 so->so_rcv.sb_hiwat : optval; 1359 break; 1360 } 1361 break; 1362 1363 case SO_SNDTIMEO: 1364 case SO_RCVTIMEO: 1365 error = sooptcopyin(sopt, &tv, sizeof tv, 1366 sizeof tv); 1367 if (error) 1368 goto bad; 1369 1370 /* assert(hz > 0); */ 1371 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1372 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1373 error = EDOM; 1374 goto bad; 1375 } 1376 /* assert(tick > 0); */ 1377 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1378 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1379 if (val > SHRT_MAX) { 1380 error = EDOM; 1381 goto bad; 1382 } 1383 1384 switch (sopt->sopt_name) { 1385 case SO_SNDTIMEO: 1386 so->so_snd.sb_timeo = val; 1387 break; 1388 case SO_RCVTIMEO: 1389 so->so_rcv.sb_timeo = val; 1390 break; 1391 } 1392 break; 1393 case SO_LABEL: 1394 #ifdef MAC 1395 error = sooptcopyin(sopt, &extmac, sizeof extmac, 1396 sizeof extmac); 1397 if (error) 1398 goto bad; 1399 1400 error = mac_setsockopt_label_set( 1401 sopt->sopt_td->td_ucred, so, &extmac); 1402 1403 #else /* MAC */ 1404 error = EOPNOTSUPP; 1405 #endif /* MAC */ 1406 break; 1407 default: 1408 error = ENOPROTOOPT; 1409 break; 1410 } 1411 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 1412 (void) ((*so->so_proto->pr_ctloutput) 1413 (so, sopt)); 1414 } 1415 } 1416 bad: 1417 return (error); 1418 } 1419 1420 /* Helper routine for getsockopt */ 1421 int 1422 sooptcopyout(sopt, buf, len) 1423 struct sockopt *sopt; 1424 void *buf; 1425 size_t len; 1426 { 1427 int error; 1428 size_t valsize; 1429 1430 error = 0; 1431 1432 /* 1433 * Documented get behavior is that we always return a value, 1434 * possibly truncated to fit in the user's buffer. 1435 * Traditional behavior is that we always tell the user 1436 * precisely how much we copied, rather than something useful 1437 * like the total amount we had available for her. 1438 * Note that this interface is not idempotent; the entire answer must 1439 * generated ahead of time. 1440 */ 1441 valsize = min(len, sopt->sopt_valsize); 1442 sopt->sopt_valsize = valsize; 1443 if (sopt->sopt_val != 0) { 1444 if (sopt->sopt_td != 0) 1445 error = copyout(buf, sopt->sopt_val, valsize); 1446 else 1447 bcopy(buf, sopt->sopt_val, valsize); 1448 } 1449 return error; 1450 } 1451 1452 int 1453 sogetopt(so, sopt) 1454 struct socket *so; 1455 struct sockopt *sopt; 1456 { 1457 int error, optval; 1458 struct linger l; 1459 struct timeval tv; 1460 #ifdef INET 1461 struct accept_filter_arg *afap; 1462 #endif 1463 #ifdef MAC 1464 struct mac extmac; 1465 #endif /* MAC */ 1466 1467 error = 0; 1468 if (sopt->sopt_level != SOL_SOCKET) { 1469 if (so->so_proto && so->so_proto->pr_ctloutput) { 1470 return ((*so->so_proto->pr_ctloutput) 1471 (so, sopt)); 1472 } else 1473 return (ENOPROTOOPT); 1474 } else { 1475 switch (sopt->sopt_name) { 1476 #ifdef INET 1477 case SO_ACCEPTFILTER: 1478 if ((so->so_options & SO_ACCEPTCONN) == 0) 1479 return (EINVAL); 1480 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1481 M_TEMP, M_WAITOK | M_ZERO); 1482 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1483 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1484 if (so->so_accf->so_accept_filter_str != NULL) 1485 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1486 } 1487 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1488 FREE(afap, M_TEMP); 1489 break; 1490 #endif 1491 1492 case SO_LINGER: 1493 l.l_onoff = so->so_options & SO_LINGER; 1494 l.l_linger = so->so_linger; 1495 error = sooptcopyout(sopt, &l, sizeof l); 1496 break; 1497 1498 case SO_USELOOPBACK: 1499 case SO_DONTROUTE: 1500 case SO_DEBUG: 1501 case SO_KEEPALIVE: 1502 case SO_REUSEADDR: 1503 case SO_REUSEPORT: 1504 case SO_BROADCAST: 1505 case SO_OOBINLINE: 1506 case SO_TIMESTAMP: 1507 case SO_NOSIGPIPE: 1508 optval = so->so_options & sopt->sopt_name; 1509 integer: 1510 error = sooptcopyout(sopt, &optval, sizeof optval); 1511 break; 1512 1513 case SO_TYPE: 1514 optval = so->so_type; 1515 goto integer; 1516 1517 case SO_ERROR: 1518 optval = so->so_error; 1519 so->so_error = 0; 1520 goto integer; 1521 1522 case SO_SNDBUF: 1523 optval = so->so_snd.sb_hiwat; 1524 goto integer; 1525 1526 case SO_RCVBUF: 1527 optval = so->so_rcv.sb_hiwat; 1528 goto integer; 1529 1530 case SO_SNDLOWAT: 1531 optval = so->so_snd.sb_lowat; 1532 goto integer; 1533 1534 case SO_RCVLOWAT: 1535 optval = so->so_rcv.sb_lowat; 1536 goto integer; 1537 1538 case SO_SNDTIMEO: 1539 case SO_RCVTIMEO: 1540 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1541 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1542 1543 tv.tv_sec = optval / hz; 1544 tv.tv_usec = (optval % hz) * tick; 1545 error = sooptcopyout(sopt, &tv, sizeof tv); 1546 break; 1547 case SO_LABEL: 1548 #ifdef MAC 1549 error = mac_getsockopt_label_get( 1550 sopt->sopt_td->td_ucred, so, &extmac); 1551 if (error) 1552 return (error); 1553 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1554 #else /* MAC */ 1555 error = EOPNOTSUPP; 1556 #endif /* MAC */ 1557 break; 1558 case SO_PEERLABEL: 1559 #ifdef MAC 1560 error = mac_getsockopt_peerlabel_get( 1561 sopt->sopt_td->td_ucred, so, &extmac); 1562 if (error) 1563 return (error); 1564 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1565 #else /* MAC */ 1566 error = EOPNOTSUPP; 1567 #endif /* MAC */ 1568 break; 1569 default: 1570 error = ENOPROTOOPT; 1571 break; 1572 } 1573 return (error); 1574 } 1575 } 1576 1577 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1578 int 1579 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1580 { 1581 struct mbuf *m, *m_prev; 1582 int sopt_size = sopt->sopt_valsize; 1583 1584 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1585 if (m == 0) 1586 return ENOBUFS; 1587 if (sopt_size > MLEN) { 1588 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1589 if ((m->m_flags & M_EXT) == 0) { 1590 m_free(m); 1591 return ENOBUFS; 1592 } 1593 m->m_len = min(MCLBYTES, sopt_size); 1594 } else { 1595 m->m_len = min(MLEN, sopt_size); 1596 } 1597 sopt_size -= m->m_len; 1598 *mp = m; 1599 m_prev = m; 1600 1601 while (sopt_size) { 1602 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1603 if (m == 0) { 1604 m_freem(*mp); 1605 return ENOBUFS; 1606 } 1607 if (sopt_size > MLEN) { 1608 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1609 if ((m->m_flags & M_EXT) == 0) { 1610 m_freem(*mp); 1611 return ENOBUFS; 1612 } 1613 m->m_len = min(MCLBYTES, sopt_size); 1614 } else { 1615 m->m_len = min(MLEN, sopt_size); 1616 } 1617 sopt_size -= m->m_len; 1618 m_prev->m_next = m; 1619 m_prev = m; 1620 } 1621 return 0; 1622 } 1623 1624 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1625 int 1626 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1627 { 1628 struct mbuf *m0 = m; 1629 1630 if (sopt->sopt_val == NULL) 1631 return 0; 1632 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1633 if (sopt->sopt_td != NULL) { 1634 int error; 1635 1636 error = copyin(sopt->sopt_val, mtod(m, char *), 1637 m->m_len); 1638 if (error != 0) { 1639 m_freem(m0); 1640 return(error); 1641 } 1642 } else 1643 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1644 sopt->sopt_valsize -= m->m_len; 1645 (caddr_t)sopt->sopt_val += m->m_len; 1646 m = m->m_next; 1647 } 1648 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1649 panic("ip6_sooptmcopyin"); 1650 return 0; 1651 } 1652 1653 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1654 int 1655 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1656 { 1657 struct mbuf *m0 = m; 1658 size_t valsize = 0; 1659 1660 if (sopt->sopt_val == NULL) 1661 return 0; 1662 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1663 if (sopt->sopt_td != NULL) { 1664 int error; 1665 1666 error = copyout(mtod(m, char *), sopt->sopt_val, 1667 m->m_len); 1668 if (error != 0) { 1669 m_freem(m0); 1670 return(error); 1671 } 1672 } else 1673 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1674 sopt->sopt_valsize -= m->m_len; 1675 (caddr_t)sopt->sopt_val += m->m_len; 1676 valsize += m->m_len; 1677 m = m->m_next; 1678 } 1679 if (m != NULL) { 1680 /* enough soopt buffer should be given from user-land */ 1681 m_freem(m0); 1682 return(EINVAL); 1683 } 1684 sopt->sopt_valsize = valsize; 1685 return 0; 1686 } 1687 1688 void 1689 sohasoutofband(so) 1690 register struct socket *so; 1691 { 1692 if (so->so_sigio != NULL) 1693 pgsigio(&so->so_sigio, SIGURG, 0); 1694 selwakeup(&so->so_rcv.sb_sel); 1695 } 1696 1697 int 1698 sopoll(struct socket *so, int events, struct ucred *active_cred, 1699 struct thread *td) 1700 { 1701 int revents = 0; 1702 int s = splnet(); 1703 1704 if (events & (POLLIN | POLLRDNORM)) 1705 if (soreadable(so)) 1706 revents |= events & (POLLIN | POLLRDNORM); 1707 1708 if (events & POLLINIGNEOF) 1709 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat || 1710 !TAILQ_EMPTY(&so->so_comp) || so->so_error) 1711 revents |= POLLINIGNEOF; 1712 1713 if (events & (POLLOUT | POLLWRNORM)) 1714 if (sowriteable(so)) 1715 revents |= events & (POLLOUT | POLLWRNORM); 1716 1717 if (events & (POLLPRI | POLLRDBAND)) 1718 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1719 revents |= events & (POLLPRI | POLLRDBAND); 1720 1721 if (revents == 0) { 1722 if (events & 1723 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | 1724 POLLRDBAND)) { 1725 selrecord(td, &so->so_rcv.sb_sel); 1726 so->so_rcv.sb_flags |= SB_SEL; 1727 } 1728 1729 if (events & (POLLOUT | POLLWRNORM)) { 1730 selrecord(td, &so->so_snd.sb_sel); 1731 so->so_snd.sb_flags |= SB_SEL; 1732 } 1733 } 1734 1735 splx(s); 1736 return (revents); 1737 } 1738 1739 int 1740 sokqfilter(struct file *fp, struct knote *kn) 1741 { 1742 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1743 struct sockbuf *sb; 1744 int s; 1745 1746 switch (kn->kn_filter) { 1747 case EVFILT_READ: 1748 if (so->so_options & SO_ACCEPTCONN) 1749 kn->kn_fop = &solisten_filtops; 1750 else 1751 kn->kn_fop = &soread_filtops; 1752 sb = &so->so_rcv; 1753 break; 1754 case EVFILT_WRITE: 1755 kn->kn_fop = &sowrite_filtops; 1756 sb = &so->so_snd; 1757 break; 1758 default: 1759 return (1); 1760 } 1761 1762 s = splnet(); 1763 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1764 sb->sb_flags |= SB_KNOTE; 1765 splx(s); 1766 return (0); 1767 } 1768 1769 static void 1770 filt_sordetach(struct knote *kn) 1771 { 1772 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1773 int s = splnet(); 1774 1775 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1776 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1777 so->so_rcv.sb_flags &= ~SB_KNOTE; 1778 splx(s); 1779 } 1780 1781 /*ARGSUSED*/ 1782 static int 1783 filt_soread(struct knote *kn, long hint) 1784 { 1785 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1786 1787 kn->kn_data = so->so_rcv.sb_cc; 1788 if (so->so_state & SS_CANTRCVMORE) { 1789 kn->kn_flags |= EV_EOF; 1790 kn->kn_fflags = so->so_error; 1791 return (1); 1792 } 1793 if (so->so_error) /* temporary udp error */ 1794 return (1); 1795 if (kn->kn_sfflags & NOTE_LOWAT) 1796 return (kn->kn_data >= kn->kn_sdata); 1797 return (kn->kn_data >= so->so_rcv.sb_lowat); 1798 } 1799 1800 static void 1801 filt_sowdetach(struct knote *kn) 1802 { 1803 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1804 int s = splnet(); 1805 1806 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1807 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1808 so->so_snd.sb_flags &= ~SB_KNOTE; 1809 splx(s); 1810 } 1811 1812 /*ARGSUSED*/ 1813 static int 1814 filt_sowrite(struct knote *kn, long hint) 1815 { 1816 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1817 1818 kn->kn_data = sbspace(&so->so_snd); 1819 if (so->so_state & SS_CANTSENDMORE) { 1820 kn->kn_flags |= EV_EOF; 1821 kn->kn_fflags = so->so_error; 1822 return (1); 1823 } 1824 if (so->so_error) /* temporary udp error */ 1825 return (1); 1826 if (((so->so_state & SS_ISCONNECTED) == 0) && 1827 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1828 return (0); 1829 if (kn->kn_sfflags & NOTE_LOWAT) 1830 return (kn->kn_data >= kn->kn_sdata); 1831 return (kn->kn_data >= so->so_snd.sb_lowat); 1832 } 1833 1834 /*ARGSUSED*/ 1835 static int 1836 filt_solisten(struct knote *kn, long hint) 1837 { 1838 struct socket *so = (struct socket *)kn->kn_fp->f_data; 1839 1840 kn->kn_data = so->so_qlen; 1841 return (! TAILQ_EMPTY(&so->so_comp)); 1842 } 1843 1844 int 1845 socheckuid(struct socket *so, uid_t uid) 1846 { 1847 1848 if (so == NULL) 1849 return (EPERM); 1850 if (so->so_cred->cr_uid == uid) 1851 return (0); 1852 return (EPERM); 1853 } 1854