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 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "opt_inet.h" 40 #include "opt_mac.h" 41 #include "opt_zero.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/fcntl.h> 46 #include <sys/limits.h> 47 #include <sys/lock.h> 48 #include <sys/mac.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/mutex.h> 52 #include <sys/domain.h> 53 #include <sys/file.h> /* for struct knote */ 54 #include <sys/kernel.h> 55 #include <sys/event.h> 56 #include <sys/poll.h> 57 #include <sys/proc.h> 58 #include <sys/protosw.h> 59 #include <sys/socket.h> 60 #include <sys/socketvar.h> 61 #include <sys/resourcevar.h> 62 #include <sys/signalvar.h> 63 #include <sys/sysctl.h> 64 #include <sys/uio.h> 65 #include <sys/jail.h> 66 67 #include <vm/uma.h> 68 69 70 #ifdef INET 71 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 72 #endif 73 74 static void filt_sordetach(struct knote *kn); 75 static int filt_soread(struct knote *kn, long hint); 76 static void filt_sowdetach(struct knote *kn); 77 static int filt_sowrite(struct knote *kn, long hint); 78 static int filt_solisten(struct knote *kn, long hint); 79 80 static struct filterops solisten_filtops = 81 { 1, NULL, filt_sordetach, filt_solisten }; 82 static struct filterops soread_filtops = 83 { 1, NULL, filt_sordetach, filt_soread }; 84 static struct filterops sowrite_filtops = 85 { 1, NULL, filt_sowdetach, filt_sowrite }; 86 87 uma_zone_t socket_zone; 88 so_gen_t so_gencnt; /* generation count for sockets */ 89 90 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 91 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 92 93 SYSCTL_DECL(_kern_ipc); 94 95 static int somaxconn = SOMAXCONN; 96 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 97 &somaxconn, 0, "Maximum pending socket connection queue size"); 98 static int numopensockets; 99 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD, 100 &numopensockets, 0, "Number of open sockets"); 101 #ifdef ZERO_COPY_SOCKETS 102 /* These aren't static because they're used in other files. */ 103 int so_zero_copy_send = 1; 104 int so_zero_copy_receive = 1; 105 SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0, 106 "Zero copy controls"); 107 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW, 108 &so_zero_copy_receive, 0, "Enable zero copy receive"); 109 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW, 110 &so_zero_copy_send, 0, "Enable zero copy send"); 111 #endif /* ZERO_COPY_SOCKETS */ 112 113 114 /* 115 * Socket operation routines. 116 * These routines are called by the routines in 117 * sys_socket.c or from a system process, and 118 * implement the semantics of socket operations by 119 * switching out to the protocol specific routines. 120 */ 121 122 /* 123 * Get a socket structure from our zone, and initialize it. 124 * Note that it would probably be better to allocate socket 125 * and PCB at the same time, but I'm not convinced that all 126 * the protocols can be easily modified to do this. 127 * 128 * soalloc() returns a socket with a ref count of 0. 129 */ 130 struct socket * 131 soalloc(waitok) 132 int waitok; 133 { 134 struct socket *so; 135 #ifdef MAC 136 int error; 137 #endif 138 int flag; 139 140 if (waitok == 1) 141 flag = M_WAITOK; 142 else 143 flag = M_NOWAIT; 144 flag |= M_ZERO; 145 so = uma_zalloc(socket_zone, flag); 146 if (so) { 147 #ifdef MAC 148 error = mac_init_socket(so, flag); 149 if (error != 0) { 150 uma_zfree(socket_zone, so); 151 so = NULL; 152 return so; 153 } 154 #endif 155 /* XXX race condition for reentrant kernel */ 156 so->so_gencnt = ++so_gencnt; 157 /* sx_init(&so->so_sxlock, "socket sxlock"); */ 158 TAILQ_INIT(&so->so_aiojobq); 159 ++numopensockets; 160 } 161 return so; 162 } 163 164 /* 165 * socreate returns a socket with a ref count of 1. The socket should be 166 * closed with soclose(). 167 */ 168 int 169 socreate(dom, aso, type, proto, cred, td) 170 int dom; 171 struct socket **aso; 172 int type; 173 int proto; 174 struct ucred *cred; 175 struct thread *td; 176 { 177 struct protosw *prp; 178 struct socket *so; 179 int error; 180 181 if (proto) 182 prp = pffindproto(dom, proto, type); 183 else 184 prp = pffindtype(dom, type); 185 186 if (prp == 0 || prp->pr_usrreqs->pru_attach == 0) 187 return (EPROTONOSUPPORT); 188 189 if (jailed(cred) && jail_socket_unixiproute_only && 190 prp->pr_domain->dom_family != PF_LOCAL && 191 prp->pr_domain->dom_family != PF_INET && 192 prp->pr_domain->dom_family != PF_ROUTE) { 193 return (EPROTONOSUPPORT); 194 } 195 196 if (prp->pr_type != type) 197 return (EPROTOTYPE); 198 so = soalloc(1); 199 if (so == NULL) 200 return (ENOBUFS); 201 202 TAILQ_INIT(&so->so_incomp); 203 TAILQ_INIT(&so->so_comp); 204 so->so_type = type; 205 so->so_cred = crhold(cred); 206 so->so_proto = prp; 207 #ifdef MAC 208 mac_create_socket(cred, so); 209 #endif 210 soref(so); 211 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td); 212 if (error) { 213 so->so_state |= SS_NOFDREF; 214 sorele(so); 215 return (error); 216 } 217 *aso = so; 218 return (0); 219 } 220 221 int 222 sobind(so, nam, td) 223 struct socket *so; 224 struct sockaddr *nam; 225 struct thread *td; 226 { 227 int s = splnet(); 228 int error; 229 230 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td); 231 splx(s); 232 return (error); 233 } 234 235 void 236 sodealloc(struct socket *so) 237 { 238 239 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count)); 240 so->so_gencnt = ++so_gencnt; 241 if (so->so_rcv.sb_hiwat) 242 (void)chgsbsize(so->so_cred->cr_uidinfo, 243 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY); 244 if (so->so_snd.sb_hiwat) 245 (void)chgsbsize(so->so_cred->cr_uidinfo, 246 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY); 247 #ifdef INET 248 /* remove acccept filter if one is present. */ 249 if (so->so_accf != NULL) 250 do_setopt_accept_filter(so, NULL); 251 #endif 252 #ifdef MAC 253 mac_destroy_socket(so); 254 #endif 255 crfree(so->so_cred); 256 /* sx_destroy(&so->so_sxlock); */ 257 uma_zfree(socket_zone, so); 258 --numopensockets; 259 } 260 261 int 262 solisten(so, backlog, td) 263 struct socket *so; 264 int backlog; 265 struct thread *td; 266 { 267 int s, error; 268 269 s = splnet(); 270 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING)) { 271 splx(s); 272 return (EINVAL); 273 } 274 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td); 275 if (error) { 276 splx(s); 277 return (error); 278 } 279 if (TAILQ_EMPTY(&so->so_comp)) 280 so->so_options |= SO_ACCEPTCONN; 281 if (backlog < 0 || backlog > somaxconn) 282 backlog = somaxconn; 283 so->so_qlimit = backlog; 284 splx(s); 285 return (0); 286 } 287 288 void 289 sofree(so) 290 struct socket *so; 291 { 292 struct socket *head = so->so_head; 293 294 KASSERT(so->so_count == 0, ("socket %p so_count not 0", so)); 295 296 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 297 return; 298 if (head != NULL) { 299 if (so->so_state & SS_INCOMP) { 300 TAILQ_REMOVE(&head->so_incomp, so, so_list); 301 head->so_incqlen--; 302 } else if (so->so_state & SS_COMP) { 303 /* 304 * We must not decommission a socket that's 305 * on the accept(2) queue. If we do, then 306 * accept(2) may hang after select(2) indicated 307 * that the listening socket was ready. 308 */ 309 return; 310 } else { 311 panic("sofree: not queued"); 312 } 313 so->so_state &= ~SS_INCOMP; 314 so->so_head = NULL; 315 } 316 sbrelease(&so->so_snd, so); 317 sorflush(so); 318 sodealloc(so); 319 } 320 321 /* 322 * Close a socket on last file table reference removal. 323 * Initiate disconnect if connected. 324 * Free socket when disconnect complete. 325 * 326 * This function will sorele() the socket. Note that soclose() may be 327 * called prior to the ref count reaching zero. The actual socket 328 * structure will not be freed until the ref count reaches zero. 329 */ 330 int 331 soclose(so) 332 struct socket *so; 333 { 334 int s = splnet(); /* conservative */ 335 int error = 0; 336 337 funsetown(&so->so_sigio); 338 if (so->so_options & SO_ACCEPTCONN) { 339 struct socket *sp, *sonext; 340 341 sp = TAILQ_FIRST(&so->so_incomp); 342 for (; sp != NULL; sp = sonext) { 343 sonext = TAILQ_NEXT(sp, so_list); 344 (void) soabort(sp); 345 } 346 for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) { 347 sonext = TAILQ_NEXT(sp, so_list); 348 /* Dequeue from so_comp since sofree() won't do it */ 349 TAILQ_REMOVE(&so->so_comp, sp, so_list); 350 so->so_qlen--; 351 sp->so_state &= ~SS_COMP; 352 sp->so_head = NULL; 353 (void) soabort(sp); 354 } 355 } 356 if (so->so_pcb == 0) 357 goto discard; 358 if (so->so_state & SS_ISCONNECTED) { 359 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 360 error = sodisconnect(so); 361 if (error) 362 goto drop; 363 } 364 if (so->so_options & SO_LINGER) { 365 if ((so->so_state & SS_ISDISCONNECTING) && 366 (so->so_state & SS_NBIO)) 367 goto drop; 368 while (so->so_state & SS_ISCONNECTED) { 369 error = tsleep(&so->so_timeo, 370 PSOCK | PCATCH, "soclos", so->so_linger * hz); 371 if (error) 372 break; 373 } 374 } 375 } 376 drop: 377 if (so->so_pcb) { 378 int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); 379 if (error == 0) 380 error = error2; 381 } 382 discard: 383 if (so->so_state & SS_NOFDREF) 384 panic("soclose: NOFDREF"); 385 so->so_state |= SS_NOFDREF; 386 sorele(so); 387 splx(s); 388 return (error); 389 } 390 391 /* 392 * Must be called at splnet... 393 */ 394 int 395 soabort(so) 396 struct socket *so; 397 { 398 int error; 399 400 error = (*so->so_proto->pr_usrreqs->pru_abort)(so); 401 if (error) { 402 sotryfree(so); /* note: does not decrement the ref count */ 403 return error; 404 } 405 return (0); 406 } 407 408 int 409 soaccept(so, nam) 410 struct socket *so; 411 struct sockaddr **nam; 412 { 413 int s = splnet(); 414 int error; 415 416 if ((so->so_state & SS_NOFDREF) == 0) 417 panic("soaccept: !NOFDREF"); 418 so->so_state &= ~SS_NOFDREF; 419 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam); 420 splx(s); 421 return (error); 422 } 423 424 int 425 soconnect(so, nam, td) 426 struct socket *so; 427 struct sockaddr *nam; 428 struct thread *td; 429 { 430 int s; 431 int error; 432 433 if (so->so_options & SO_ACCEPTCONN) 434 return (EOPNOTSUPP); 435 s = splnet(); 436 /* 437 * If protocol is connection-based, can only connect once. 438 * Otherwise, if connected, try to disconnect first. 439 * This allows user to disconnect by connecting to, e.g., 440 * a null address. 441 */ 442 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 443 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 444 (error = sodisconnect(so)))) 445 error = EISCONN; 446 else 447 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td); 448 splx(s); 449 return (error); 450 } 451 452 int 453 soconnect2(so1, so2) 454 struct socket *so1; 455 struct socket *so2; 456 { 457 int s = splnet(); 458 int error; 459 460 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2); 461 splx(s); 462 return (error); 463 } 464 465 int 466 sodisconnect(so) 467 struct socket *so; 468 { 469 int s = splnet(); 470 int error; 471 472 if ((so->so_state & SS_ISCONNECTED) == 0) { 473 error = ENOTCONN; 474 goto bad; 475 } 476 if (so->so_state & SS_ISDISCONNECTING) { 477 error = EALREADY; 478 goto bad; 479 } 480 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so); 481 bad: 482 splx(s); 483 return (error); 484 } 485 486 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 487 /* 488 * Send on a socket. 489 * If send must go all at once and message is larger than 490 * send buffering, then hard error. 491 * Lock against other senders. 492 * If must go all at once and not enough room now, then 493 * inform user that this would block and do nothing. 494 * Otherwise, if nonblocking, send as much as possible. 495 * The data to be sent is described by "uio" if nonzero, 496 * otherwise by the mbuf chain "top" (which must be null 497 * if uio is not). Data provided in mbuf chain must be small 498 * enough to send all at once. 499 * 500 * Returns nonzero on error, timeout or signal; callers 501 * must check for short counts if EINTR/ERESTART are returned. 502 * Data and control buffers are freed on return. 503 */ 504 505 #ifdef ZERO_COPY_SOCKETS 506 struct so_zerocopy_stats{ 507 int size_ok; 508 int align_ok; 509 int found_ifp; 510 }; 511 struct so_zerocopy_stats so_zerocp_stats = {0,0,0}; 512 #include <netinet/in.h> 513 #include <net/route.h> 514 #include <netinet/in_pcb.h> 515 #include <vm/vm.h> 516 #include <vm/vm_page.h> 517 #include <vm/vm_object.h> 518 #endif /*ZERO_COPY_SOCKETS*/ 519 520 int 521 sosend(so, addr, uio, top, control, flags, td) 522 struct socket *so; 523 struct sockaddr *addr; 524 struct uio *uio; 525 struct mbuf *top; 526 struct mbuf *control; 527 int flags; 528 struct thread *td; 529 { 530 struct mbuf **mp; 531 struct mbuf *m; 532 long space, len, resid; 533 int clen = 0, error, s, dontroute, mlen; 534 int atomic = sosendallatonce(so) || top; 535 #ifdef ZERO_COPY_SOCKETS 536 int cow_send; 537 #endif /* ZERO_COPY_SOCKETS */ 538 539 if (uio) 540 resid = uio->uio_resid; 541 else 542 resid = top->m_pkthdr.len; 543 /* 544 * In theory resid should be unsigned. 545 * However, space must be signed, as it might be less than 0 546 * if we over-committed, and we must use a signed comparison 547 * of space and resid. On the other hand, a negative resid 548 * causes us to loop sending 0-length segments to the protocol. 549 * 550 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM 551 * type sockets since that's an error. 552 */ 553 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { 554 error = EINVAL; 555 goto out; 556 } 557 558 dontroute = 559 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 560 (so->so_proto->pr_flags & PR_ATOMIC); 561 if (td) 562 td->td_proc->p_stats->p_ru.ru_msgsnd++; 563 if (control) 564 clen = control->m_len; 565 #define snderr(errno) { error = (errno); splx(s); goto release; } 566 567 restart: 568 error = sblock(&so->so_snd, SBLOCKWAIT(flags)); 569 if (error) 570 goto out; 571 do { 572 s = splnet(); 573 if (so->so_state & SS_CANTSENDMORE) 574 snderr(EPIPE); 575 if (so->so_error) { 576 error = so->so_error; 577 so->so_error = 0; 578 splx(s); 579 goto release; 580 } 581 if ((so->so_state & SS_ISCONNECTED) == 0) { 582 /* 583 * `sendto' and `sendmsg' is allowed on a connection- 584 * based socket if it supports implied connect. 585 * Return ENOTCONN if not connected and no address is 586 * supplied. 587 */ 588 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && 589 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { 590 if ((so->so_state & SS_ISCONFIRMING) == 0 && 591 !(resid == 0 && clen != 0)) 592 snderr(ENOTCONN); 593 } else if (addr == 0) 594 snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ? 595 ENOTCONN : EDESTADDRREQ); 596 } 597 space = sbspace(&so->so_snd); 598 if (flags & MSG_OOB) 599 space += 1024; 600 if ((atomic && resid > so->so_snd.sb_hiwat) || 601 clen > so->so_snd.sb_hiwat) 602 snderr(EMSGSIZE); 603 if (space < resid + clen && 604 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 605 if (so->so_state & SS_NBIO) 606 snderr(EWOULDBLOCK); 607 sbunlock(&so->so_snd); 608 error = sbwait(&so->so_snd); 609 splx(s); 610 if (error) 611 goto out; 612 goto restart; 613 } 614 splx(s); 615 mp = ⊤ 616 space -= clen; 617 do { 618 if (uio == NULL) { 619 /* 620 * Data is prepackaged in "top". 621 */ 622 resid = 0; 623 if (flags & MSG_EOR) 624 top->m_flags |= M_EOR; 625 } else do { 626 #ifdef ZERO_COPY_SOCKETS 627 cow_send = 0; 628 #endif /* ZERO_COPY_SOCKETS */ 629 if (top == 0) { 630 MGETHDR(m, M_TRYWAIT, MT_DATA); 631 if (m == NULL) { 632 error = ENOBUFS; 633 goto release; 634 } 635 mlen = MHLEN; 636 m->m_pkthdr.len = 0; 637 m->m_pkthdr.rcvif = (struct ifnet *)0; 638 } else { 639 MGET(m, M_TRYWAIT, MT_DATA); 640 if (m == NULL) { 641 error = ENOBUFS; 642 goto release; 643 } 644 mlen = MLEN; 645 } 646 if (resid >= MINCLSIZE) { 647 #ifdef ZERO_COPY_SOCKETS 648 if (so_zero_copy_send && 649 resid>=PAGE_SIZE && 650 space>=PAGE_SIZE && 651 uio->uio_iov->iov_len>=PAGE_SIZE) { 652 so_zerocp_stats.size_ok++; 653 if (!((vm_offset_t) 654 uio->uio_iov->iov_base & PAGE_MASK)){ 655 so_zerocp_stats.align_ok++; 656 cow_send = socow_setup(m, uio); 657 } 658 } 659 if (!cow_send){ 660 #endif /* ZERO_COPY_SOCKETS */ 661 MCLGET(m, M_TRYWAIT); 662 if ((m->m_flags & M_EXT) == 0) 663 goto nopages; 664 mlen = MCLBYTES; 665 len = min(min(mlen, resid), space); 666 } else { 667 #ifdef ZERO_COPY_SOCKETS 668 len = PAGE_SIZE; 669 } 670 671 } else { 672 #endif /* ZERO_COPY_SOCKETS */ 673 nopages: 674 len = min(min(mlen, resid), space); 675 /* 676 * For datagram protocols, leave room 677 * for protocol headers in first mbuf. 678 */ 679 if (atomic && top == 0 && len < mlen) 680 MH_ALIGN(m, len); 681 } 682 space -= len; 683 #ifdef ZERO_COPY_SOCKETS 684 if (cow_send) 685 error = 0; 686 else 687 #endif /* ZERO_COPY_SOCKETS */ 688 error = uiomove(mtod(m, void *), (int)len, uio); 689 resid = uio->uio_resid; 690 m->m_len = len; 691 *mp = m; 692 top->m_pkthdr.len += len; 693 if (error) 694 goto release; 695 mp = &m->m_next; 696 if (resid <= 0) { 697 if (flags & MSG_EOR) 698 top->m_flags |= M_EOR; 699 break; 700 } 701 } while (space > 0 && atomic); 702 if (dontroute) 703 so->so_options |= SO_DONTROUTE; 704 s = splnet(); /* XXX */ 705 /* 706 * XXX all the SS_CANTSENDMORE checks previously 707 * done could be out of date. We could have recieved 708 * a reset packet in an interrupt or maybe we slept 709 * while doing page faults in uiomove() etc. We could 710 * probably recheck again inside the splnet() protection 711 * here, but there are probably other places that this 712 * also happens. We must rethink this. 713 */ 714 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 715 (flags & MSG_OOB) ? PRUS_OOB : 716 /* 717 * If the user set MSG_EOF, the protocol 718 * understands this flag and nothing left to 719 * send then use PRU_SEND_EOF instead of PRU_SEND. 720 */ 721 ((flags & MSG_EOF) && 722 (so->so_proto->pr_flags & PR_IMPLOPCL) && 723 (resid <= 0)) ? 724 PRUS_EOF : 725 /* If there is more to send set PRUS_MORETOCOME */ 726 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0, 727 top, addr, control, td); 728 splx(s); 729 if (dontroute) 730 so->so_options &= ~SO_DONTROUTE; 731 clen = 0; 732 control = 0; 733 top = 0; 734 mp = ⊤ 735 if (error) 736 goto release; 737 } while (resid && space > 0); 738 } while (resid); 739 740 release: 741 sbunlock(&so->so_snd); 742 out: 743 if (top) 744 m_freem(top); 745 if (control) 746 m_freem(control); 747 return (error); 748 } 749 750 /* 751 * Implement receive operations on a socket. 752 * We depend on the way that records are added to the sockbuf 753 * by sbappend*. In particular, each record (mbufs linked through m_next) 754 * must begin with an address if the protocol so specifies, 755 * followed by an optional mbuf or mbufs containing ancillary data, 756 * and then zero or more mbufs of data. 757 * In order to avoid blocking network interrupts for the entire time here, 758 * we splx() while doing the actual copy to user space. 759 * Although the sockbuf is locked, new data may still be appended, 760 * and thus we must maintain consistency of the sockbuf during that time. 761 * 762 * The caller may receive the data as a single mbuf chain by supplying 763 * an mbuf **mp0 for use in returning the chain. The uio is then used 764 * only for the count in uio_resid. 765 */ 766 int 767 soreceive(so, psa, uio, mp0, controlp, flagsp) 768 struct socket *so; 769 struct sockaddr **psa; 770 struct uio *uio; 771 struct mbuf **mp0; 772 struct mbuf **controlp; 773 int *flagsp; 774 { 775 struct mbuf *m, **mp; 776 int flags, len, error, s, offset; 777 struct protosw *pr = so->so_proto; 778 struct mbuf *nextrecord; 779 int moff, type = 0; 780 int orig_resid = uio->uio_resid; 781 782 mp = mp0; 783 if (psa) 784 *psa = 0; 785 if (controlp) 786 *controlp = 0; 787 if (flagsp) 788 flags = *flagsp &~ MSG_EOR; 789 else 790 flags = 0; 791 if (flags & MSG_OOB) { 792 m = m_get(M_TRYWAIT, MT_DATA); 793 if (m == NULL) 794 return (ENOBUFS); 795 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); 796 if (error) 797 goto bad; 798 do { 799 #ifdef ZERO_COPY_SOCKETS 800 if (so_zero_copy_receive) { 801 vm_page_t pg; 802 int disposable; 803 804 if ((m->m_flags & M_EXT) 805 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 806 disposable = 1; 807 else 808 disposable = 0; 809 810 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t))); 811 if (uio->uio_offset == -1) 812 uio->uio_offset =IDX_TO_OFF(pg->pindex); 813 814 error = uiomoveco(mtod(m, void *), 815 min(uio->uio_resid, m->m_len), 816 uio, pg->object, 817 disposable); 818 } else 819 #endif /* ZERO_COPY_SOCKETS */ 820 error = uiomove(mtod(m, void *), 821 (int) min(uio->uio_resid, m->m_len), uio); 822 m = m_free(m); 823 } while (uio->uio_resid && error == 0 && m); 824 bad: 825 if (m) 826 m_freem(m); 827 return (error); 828 } 829 if (mp) 830 *mp = (struct mbuf *)0; 831 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 832 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 833 834 restart: 835 error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); 836 if (error) 837 return (error); 838 s = splnet(); 839 840 m = so->so_rcv.sb_mb; 841 /* 842 * If we have less data than requested, block awaiting more 843 * (subject to any timeout) if: 844 * 1. the current count is less than the low water mark, or 845 * 2. MSG_WAITALL is set, and it is possible to do the entire 846 * receive operation at once if we block (resid <= hiwat). 847 * 3. MSG_DONTWAIT is not set 848 * If MSG_WAITALL is set but resid is larger than the receive buffer, 849 * we have to do the receive in sections, and thus risk returning 850 * a short count if a timeout or signal occurs after we start. 851 */ 852 if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && 853 so->so_rcv.sb_cc < uio->uio_resid) && 854 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 855 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 856 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 857 KASSERT(m != 0 || !so->so_rcv.sb_cc, 858 ("receive: m == %p so->so_rcv.sb_cc == %u", 859 m, so->so_rcv.sb_cc)); 860 if (so->so_error) { 861 if (m) 862 goto dontblock; 863 error = so->so_error; 864 if ((flags & MSG_PEEK) == 0) 865 so->so_error = 0; 866 goto release; 867 } 868 if (so->so_state & SS_CANTRCVMORE) { 869 if (m) 870 goto dontblock; 871 else 872 goto release; 873 } 874 for (; m; m = m->m_next) 875 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 876 m = so->so_rcv.sb_mb; 877 goto dontblock; 878 } 879 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 880 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 881 error = ENOTCONN; 882 goto release; 883 } 884 if (uio->uio_resid == 0) 885 goto release; 886 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 887 error = EWOULDBLOCK; 888 goto release; 889 } 890 sbunlock(&so->so_rcv); 891 error = sbwait(&so->so_rcv); 892 splx(s); 893 if (error) 894 return (error); 895 goto restart; 896 } 897 dontblock: 898 if (uio->uio_td) 899 uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++; 900 nextrecord = m->m_nextpkt; 901 if (pr->pr_flags & PR_ADDR) { 902 KASSERT(m->m_type == MT_SONAME, 903 ("m->m_type == %d", m->m_type)); 904 orig_resid = 0; 905 if (psa) 906 *psa = dup_sockaddr(mtod(m, struct sockaddr *), 907 mp0 == 0); 908 if (flags & MSG_PEEK) { 909 m = m->m_next; 910 } else { 911 sbfree(&so->so_rcv, m); 912 so->so_rcv.sb_mb = m_free(m); 913 m = so->so_rcv.sb_mb; 914 } 915 } 916 while (m && m->m_type == MT_CONTROL && error == 0) { 917 if (flags & MSG_PEEK) { 918 if (controlp) 919 *controlp = m_copy(m, 0, m->m_len); 920 m = m->m_next; 921 } else { 922 sbfree(&so->so_rcv, m); 923 so->so_rcv.sb_mb = m->m_next; 924 m->m_next = NULL; 925 if (pr->pr_domain->dom_externalize) 926 error = 927 (*pr->pr_domain->dom_externalize)(m, controlp); 928 else if (controlp) 929 *controlp = m; 930 else 931 m_freem(m); 932 m = so->so_rcv.sb_mb; 933 } 934 if (controlp) { 935 orig_resid = 0; 936 while (*controlp != NULL) 937 controlp = &(*controlp)->m_next; 938 } 939 } 940 if (m) { 941 if ((flags & MSG_PEEK) == 0) 942 m->m_nextpkt = nextrecord; 943 type = m->m_type; 944 if (type == MT_OOBDATA) 945 flags |= MSG_OOB; 946 } 947 moff = 0; 948 offset = 0; 949 while (m && uio->uio_resid > 0 && error == 0) { 950 if (m->m_type == MT_OOBDATA) { 951 if (type != MT_OOBDATA) 952 break; 953 } else if (type == MT_OOBDATA) 954 break; 955 else 956 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 957 ("m->m_type == %d", m->m_type)); 958 so->so_state &= ~SS_RCVATMARK; 959 len = uio->uio_resid; 960 if (so->so_oobmark && len > so->so_oobmark - offset) 961 len = so->so_oobmark - offset; 962 if (len > m->m_len - moff) 963 len = m->m_len - moff; 964 /* 965 * If mp is set, just pass back the mbufs. 966 * Otherwise copy them out via the uio, then free. 967 * Sockbuf must be consistent here (points to current mbuf, 968 * it points to next record) when we drop priority; 969 * we must note any additions to the sockbuf when we 970 * block interrupts again. 971 */ 972 if (mp == 0) { 973 splx(s); 974 #ifdef ZERO_COPY_SOCKETS 975 if (so_zero_copy_receive) { 976 vm_page_t pg; 977 int disposable; 978 979 if ((m->m_flags & M_EXT) 980 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 981 disposable = 1; 982 else 983 disposable = 0; 984 985 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) + 986 moff)); 987 988 if (uio->uio_offset == -1) 989 uio->uio_offset =IDX_TO_OFF(pg->pindex); 990 991 error = uiomoveco(mtod(m, char *) + moff, 992 (int)len, uio,pg->object, 993 disposable); 994 } else 995 #endif /* ZERO_COPY_SOCKETS */ 996 error = uiomove(mtod(m, char *) + moff, (int)len, uio); 997 s = splnet(); 998 if (error) 999 goto release; 1000 } else 1001 uio->uio_resid -= len; 1002 if (len == m->m_len - moff) { 1003 if (m->m_flags & M_EOR) 1004 flags |= MSG_EOR; 1005 if (flags & MSG_PEEK) { 1006 m = m->m_next; 1007 moff = 0; 1008 } else { 1009 nextrecord = m->m_nextpkt; 1010 sbfree(&so->so_rcv, m); 1011 if (mp) { 1012 *mp = m; 1013 mp = &m->m_next; 1014 so->so_rcv.sb_mb = m = m->m_next; 1015 *mp = (struct mbuf *)0; 1016 } else { 1017 so->so_rcv.sb_mb = m_free(m); 1018 m = so->so_rcv.sb_mb; 1019 } 1020 if (m) 1021 m->m_nextpkt = nextrecord; 1022 } 1023 } else { 1024 if (flags & MSG_PEEK) 1025 moff += len; 1026 else { 1027 if (mp) 1028 *mp = m_copym(m, 0, len, M_TRYWAIT); 1029 m->m_data += len; 1030 m->m_len -= len; 1031 so->so_rcv.sb_cc -= len; 1032 } 1033 } 1034 if (so->so_oobmark) { 1035 if ((flags & MSG_PEEK) == 0) { 1036 so->so_oobmark -= len; 1037 if (so->so_oobmark == 0) { 1038 so->so_state |= SS_RCVATMARK; 1039 break; 1040 } 1041 } else { 1042 offset += len; 1043 if (offset == so->so_oobmark) 1044 break; 1045 } 1046 } 1047 if (flags & MSG_EOR) 1048 break; 1049 /* 1050 * If the MSG_WAITALL flag is set (for non-atomic socket), 1051 * we must not quit until "uio->uio_resid == 0" or an error 1052 * termination. If a signal/timeout occurs, return 1053 * with a short count but without error. 1054 * Keep sockbuf locked against other readers. 1055 */ 1056 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 1057 !sosendallatonce(so) && !nextrecord) { 1058 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1059 break; 1060 /* 1061 * Notify the protocol that some data has been 1062 * drained before blocking. 1063 */ 1064 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1065 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1066 error = sbwait(&so->so_rcv); 1067 if (error) { 1068 sbunlock(&so->so_rcv); 1069 splx(s); 1070 return (0); 1071 } 1072 m = so->so_rcv.sb_mb; 1073 if (m) 1074 nextrecord = m->m_nextpkt; 1075 } 1076 } 1077 1078 if (m && pr->pr_flags & PR_ATOMIC) { 1079 flags |= MSG_TRUNC; 1080 if ((flags & MSG_PEEK) == 0) 1081 (void) sbdroprecord(&so->so_rcv); 1082 } 1083 if ((flags & MSG_PEEK) == 0) { 1084 if (m == 0) 1085 so->so_rcv.sb_mb = nextrecord; 1086 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1087 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1088 } 1089 if (orig_resid == uio->uio_resid && orig_resid && 1090 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1091 sbunlock(&so->so_rcv); 1092 splx(s); 1093 goto restart; 1094 } 1095 1096 if (flagsp) 1097 *flagsp |= flags; 1098 release: 1099 sbunlock(&so->so_rcv); 1100 splx(s); 1101 return (error); 1102 } 1103 1104 int 1105 soshutdown(so, how) 1106 struct socket *so; 1107 int how; 1108 { 1109 struct protosw *pr = so->so_proto; 1110 1111 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1112 return (EINVAL); 1113 1114 if (how != SHUT_WR) 1115 sorflush(so); 1116 if (how != SHUT_RD) 1117 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 1118 return (0); 1119 } 1120 1121 void 1122 sorflush(so) 1123 struct socket *so; 1124 { 1125 struct sockbuf *sb = &so->so_rcv; 1126 struct protosw *pr = so->so_proto; 1127 int s; 1128 struct sockbuf asb; 1129 1130 sb->sb_flags |= SB_NOINTR; 1131 (void) sblock(sb, M_WAITOK); 1132 s = splimp(); 1133 socantrcvmore(so); 1134 sbunlock(sb); 1135 asb = *sb; 1136 /* 1137 * Invalidate/clear most of the sockbuf structure, but keep 1138 * its selinfo structure valid. 1139 */ 1140 bzero(&sb->sb_startzero, 1141 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); 1142 splx(s); 1143 1144 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 1145 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1146 sbrelease(&asb, so); 1147 } 1148 1149 #ifdef INET 1150 static int 1151 do_setopt_accept_filter(so, sopt) 1152 struct socket *so; 1153 struct sockopt *sopt; 1154 { 1155 struct accept_filter_arg *afap = NULL; 1156 struct accept_filter *afp; 1157 struct so_accf *af = so->so_accf; 1158 int error = 0; 1159 1160 /* do not set/remove accept filters on non listen sockets */ 1161 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1162 error = EINVAL; 1163 goto out; 1164 } 1165 1166 /* removing the filter */ 1167 if (sopt == NULL) { 1168 if (af != NULL) { 1169 if (af->so_accept_filter != NULL && 1170 af->so_accept_filter->accf_destroy != NULL) { 1171 af->so_accept_filter->accf_destroy(so); 1172 } 1173 if (af->so_accept_filter_str != NULL) { 1174 FREE(af->so_accept_filter_str, M_ACCF); 1175 } 1176 FREE(af, M_ACCF); 1177 so->so_accf = NULL; 1178 } 1179 so->so_options &= ~SO_ACCEPTFILTER; 1180 return (0); 1181 } 1182 /* adding a filter */ 1183 /* must remove previous filter first */ 1184 if (af != NULL) { 1185 error = EINVAL; 1186 goto out; 1187 } 1188 /* don't put large objects on the kernel stack */ 1189 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1190 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1191 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1192 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1193 if (error) 1194 goto out; 1195 afp = accept_filt_get(afap->af_name); 1196 if (afp == NULL) { 1197 error = ENOENT; 1198 goto out; 1199 } 1200 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1201 if (afp->accf_create != NULL) { 1202 if (afap->af_name[0] != '\0') { 1203 int len = strlen(afap->af_name) + 1; 1204 1205 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1206 strcpy(af->so_accept_filter_str, afap->af_name); 1207 } 1208 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1209 if (af->so_accept_filter_arg == NULL) { 1210 FREE(af->so_accept_filter_str, M_ACCF); 1211 FREE(af, M_ACCF); 1212 so->so_accf = NULL; 1213 error = EINVAL; 1214 goto out; 1215 } 1216 } 1217 af->so_accept_filter = afp; 1218 so->so_accf = af; 1219 so->so_options |= SO_ACCEPTFILTER; 1220 out: 1221 if (afap != NULL) 1222 FREE(afap, M_TEMP); 1223 return (error); 1224 } 1225 #endif /* INET */ 1226 1227 /* 1228 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1229 * an additional variant to handle the case where the option value needs 1230 * to be some kind of integer, but not a specific size. 1231 * In addition to their use here, these functions are also called by the 1232 * protocol-level pr_ctloutput() routines. 1233 */ 1234 int 1235 sooptcopyin(sopt, buf, len, minlen) 1236 struct sockopt *sopt; 1237 void *buf; 1238 size_t len; 1239 size_t minlen; 1240 { 1241 size_t valsize; 1242 1243 /* 1244 * If the user gives us more than we wanted, we ignore it, 1245 * but if we don't get the minimum length the caller 1246 * wants, we return EINVAL. On success, sopt->sopt_valsize 1247 * is set to however much we actually retrieved. 1248 */ 1249 if ((valsize = sopt->sopt_valsize) < minlen) 1250 return EINVAL; 1251 if (valsize > len) 1252 sopt->sopt_valsize = valsize = len; 1253 1254 if (sopt->sopt_td != 0) 1255 return (copyin(sopt->sopt_val, buf, valsize)); 1256 1257 bcopy(sopt->sopt_val, buf, valsize); 1258 return 0; 1259 } 1260 1261 int 1262 sosetopt(so, sopt) 1263 struct socket *so; 1264 struct sockopt *sopt; 1265 { 1266 int error, optval; 1267 struct linger l; 1268 struct timeval tv; 1269 u_long val; 1270 #ifdef MAC 1271 struct mac extmac; 1272 #endif 1273 1274 error = 0; 1275 if (sopt->sopt_level != SOL_SOCKET) { 1276 if (so->so_proto && so->so_proto->pr_ctloutput) 1277 return ((*so->so_proto->pr_ctloutput) 1278 (so, sopt)); 1279 error = ENOPROTOOPT; 1280 } else { 1281 switch (sopt->sopt_name) { 1282 #ifdef INET 1283 case SO_ACCEPTFILTER: 1284 error = do_setopt_accept_filter(so, sopt); 1285 if (error) 1286 goto bad; 1287 break; 1288 #endif 1289 case SO_LINGER: 1290 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1291 if (error) 1292 goto bad; 1293 1294 so->so_linger = l.l_linger; 1295 if (l.l_onoff) 1296 so->so_options |= SO_LINGER; 1297 else 1298 so->so_options &= ~SO_LINGER; 1299 break; 1300 1301 case SO_DEBUG: 1302 case SO_KEEPALIVE: 1303 case SO_DONTROUTE: 1304 case SO_USELOOPBACK: 1305 case SO_BROADCAST: 1306 case SO_REUSEADDR: 1307 case SO_REUSEPORT: 1308 case SO_OOBINLINE: 1309 case SO_TIMESTAMP: 1310 case SO_NOSIGPIPE: 1311 error = sooptcopyin(sopt, &optval, sizeof optval, 1312 sizeof optval); 1313 if (error) 1314 goto bad; 1315 if (optval) 1316 so->so_options |= sopt->sopt_name; 1317 else 1318 so->so_options &= ~sopt->sopt_name; 1319 break; 1320 1321 case SO_SNDBUF: 1322 case SO_RCVBUF: 1323 case SO_SNDLOWAT: 1324 case SO_RCVLOWAT: 1325 error = sooptcopyin(sopt, &optval, sizeof optval, 1326 sizeof optval); 1327 if (error) 1328 goto bad; 1329 1330 /* 1331 * Values < 1 make no sense for any of these 1332 * options, so disallow them. 1333 */ 1334 if (optval < 1) { 1335 error = EINVAL; 1336 goto bad; 1337 } 1338 1339 switch (sopt->sopt_name) { 1340 case SO_SNDBUF: 1341 case SO_RCVBUF: 1342 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1343 &so->so_snd : &so->so_rcv, (u_long)optval, 1344 so, curthread) == 0) { 1345 error = ENOBUFS; 1346 goto bad; 1347 } 1348 break; 1349 1350 /* 1351 * Make sure the low-water is never greater than 1352 * the high-water. 1353 */ 1354 case SO_SNDLOWAT: 1355 so->so_snd.sb_lowat = 1356 (optval > so->so_snd.sb_hiwat) ? 1357 so->so_snd.sb_hiwat : optval; 1358 break; 1359 case SO_RCVLOWAT: 1360 so->so_rcv.sb_lowat = 1361 (optval > so->so_rcv.sb_hiwat) ? 1362 so->so_rcv.sb_hiwat : optval; 1363 break; 1364 } 1365 break; 1366 1367 case SO_SNDTIMEO: 1368 case SO_RCVTIMEO: 1369 error = sooptcopyin(sopt, &tv, sizeof tv, 1370 sizeof tv); 1371 if (error) 1372 goto bad; 1373 1374 /* assert(hz > 0); */ 1375 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1376 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1377 error = EDOM; 1378 goto bad; 1379 } 1380 /* assert(tick > 0); */ 1381 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1382 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1383 if (val > SHRT_MAX) { 1384 error = EDOM; 1385 goto bad; 1386 } 1387 if (val == 0 && tv.tv_usec != 0) 1388 val = 1; 1389 1390 switch (sopt->sopt_name) { 1391 case SO_SNDTIMEO: 1392 so->so_snd.sb_timeo = val; 1393 break; 1394 case SO_RCVTIMEO: 1395 so->so_rcv.sb_timeo = val; 1396 break; 1397 } 1398 break; 1399 case SO_LABEL: 1400 #ifdef MAC 1401 error = sooptcopyin(sopt, &extmac, sizeof extmac, 1402 sizeof extmac); 1403 if (error) 1404 goto bad; 1405 1406 error = mac_setsockopt_label_set( 1407 sopt->sopt_td->td_ucred, so, &extmac); 1408 1409 #else 1410 error = EOPNOTSUPP; 1411 #endif 1412 break; 1413 default: 1414 error = ENOPROTOOPT; 1415 break; 1416 } 1417 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 1418 (void) ((*so->so_proto->pr_ctloutput) 1419 (so, sopt)); 1420 } 1421 } 1422 bad: 1423 return (error); 1424 } 1425 1426 /* Helper routine for getsockopt */ 1427 int 1428 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len) 1429 { 1430 int error; 1431 size_t valsize; 1432 1433 error = 0; 1434 1435 /* 1436 * Documented get behavior is that we always return a value, 1437 * possibly truncated to fit in the user's buffer. 1438 * Traditional behavior is that we always tell the user 1439 * precisely how much we copied, rather than something useful 1440 * like the total amount we had available for her. 1441 * Note that this interface is not idempotent; the entire answer must 1442 * generated ahead of time. 1443 */ 1444 valsize = min(len, sopt->sopt_valsize); 1445 sopt->sopt_valsize = valsize; 1446 if (sopt->sopt_val != 0) { 1447 if (sopt->sopt_td != 0) 1448 error = copyout(buf, sopt->sopt_val, valsize); 1449 else 1450 bcopy(buf, sopt->sopt_val, valsize); 1451 } 1452 return error; 1453 } 1454 1455 int 1456 sogetopt(so, sopt) 1457 struct socket *so; 1458 struct sockopt *sopt; 1459 { 1460 int error, optval; 1461 struct linger l; 1462 struct timeval tv; 1463 #ifdef INET 1464 struct accept_filter_arg *afap; 1465 #endif 1466 #ifdef MAC 1467 struct mac extmac; 1468 #endif 1469 1470 error = 0; 1471 if (sopt->sopt_level != SOL_SOCKET) { 1472 if (so->so_proto && so->so_proto->pr_ctloutput) { 1473 return ((*so->so_proto->pr_ctloutput) 1474 (so, sopt)); 1475 } else 1476 return (ENOPROTOOPT); 1477 } else { 1478 switch (sopt->sopt_name) { 1479 #ifdef INET 1480 case SO_ACCEPTFILTER: 1481 if ((so->so_options & SO_ACCEPTCONN) == 0) 1482 return (EINVAL); 1483 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1484 M_TEMP, M_WAITOK | M_ZERO); 1485 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1486 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1487 if (so->so_accf->so_accept_filter_str != NULL) 1488 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1489 } 1490 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1491 FREE(afap, M_TEMP); 1492 break; 1493 #endif 1494 1495 case SO_LINGER: 1496 l.l_onoff = so->so_options & SO_LINGER; 1497 l.l_linger = so->so_linger; 1498 error = sooptcopyout(sopt, &l, sizeof l); 1499 break; 1500 1501 case SO_USELOOPBACK: 1502 case SO_DONTROUTE: 1503 case SO_DEBUG: 1504 case SO_KEEPALIVE: 1505 case SO_REUSEADDR: 1506 case SO_REUSEPORT: 1507 case SO_BROADCAST: 1508 case SO_OOBINLINE: 1509 case SO_TIMESTAMP: 1510 case SO_NOSIGPIPE: 1511 optval = so->so_options & sopt->sopt_name; 1512 integer: 1513 error = sooptcopyout(sopt, &optval, sizeof optval); 1514 break; 1515 1516 case SO_TYPE: 1517 optval = so->so_type; 1518 goto integer; 1519 1520 case SO_ERROR: 1521 optval = so->so_error; 1522 so->so_error = 0; 1523 goto integer; 1524 1525 case SO_SNDBUF: 1526 optval = so->so_snd.sb_hiwat; 1527 goto integer; 1528 1529 case SO_RCVBUF: 1530 optval = so->so_rcv.sb_hiwat; 1531 goto integer; 1532 1533 case SO_SNDLOWAT: 1534 optval = so->so_snd.sb_lowat; 1535 goto integer; 1536 1537 case SO_RCVLOWAT: 1538 optval = so->so_rcv.sb_lowat; 1539 goto integer; 1540 1541 case SO_SNDTIMEO: 1542 case SO_RCVTIMEO: 1543 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1544 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1545 1546 tv.tv_sec = optval / hz; 1547 tv.tv_usec = (optval % hz) * tick; 1548 error = sooptcopyout(sopt, &tv, sizeof tv); 1549 break; 1550 case SO_LABEL: 1551 #ifdef MAC 1552 error = mac_getsockopt_label_get( 1553 sopt->sopt_td->td_ucred, so, &extmac); 1554 if (error) 1555 return (error); 1556 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1557 #else 1558 error = EOPNOTSUPP; 1559 #endif 1560 break; 1561 case SO_PEERLABEL: 1562 #ifdef MAC 1563 error = mac_getsockopt_peerlabel_get( 1564 sopt->sopt_td->td_ucred, so, &extmac); 1565 if (error) 1566 return (error); 1567 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1568 #else 1569 error = EOPNOTSUPP; 1570 #endif 1571 break; 1572 default: 1573 error = ENOPROTOOPT; 1574 break; 1575 } 1576 return (error); 1577 } 1578 } 1579 1580 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1581 int 1582 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1583 { 1584 struct mbuf *m, *m_prev; 1585 int sopt_size = sopt->sopt_valsize; 1586 1587 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1588 if (m == 0) 1589 return ENOBUFS; 1590 if (sopt_size > MLEN) { 1591 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1592 if ((m->m_flags & M_EXT) == 0) { 1593 m_free(m); 1594 return ENOBUFS; 1595 } 1596 m->m_len = min(MCLBYTES, sopt_size); 1597 } else { 1598 m->m_len = min(MLEN, sopt_size); 1599 } 1600 sopt_size -= m->m_len; 1601 *mp = m; 1602 m_prev = m; 1603 1604 while (sopt_size) { 1605 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1606 if (m == 0) { 1607 m_freem(*mp); 1608 return ENOBUFS; 1609 } 1610 if (sopt_size > MLEN) { 1611 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1612 if ((m->m_flags & M_EXT) == 0) { 1613 m_freem(*mp); 1614 return ENOBUFS; 1615 } 1616 m->m_len = min(MCLBYTES, sopt_size); 1617 } else { 1618 m->m_len = min(MLEN, sopt_size); 1619 } 1620 sopt_size -= m->m_len; 1621 m_prev->m_next = m; 1622 m_prev = m; 1623 } 1624 return 0; 1625 } 1626 1627 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1628 int 1629 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1630 { 1631 struct mbuf *m0 = m; 1632 1633 if (sopt->sopt_val == NULL) 1634 return 0; 1635 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1636 if (sopt->sopt_td != NULL) { 1637 int error; 1638 1639 error = copyin(sopt->sopt_val, mtod(m, char *), 1640 m->m_len); 1641 if (error != 0) { 1642 m_freem(m0); 1643 return(error); 1644 } 1645 } else 1646 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1647 sopt->sopt_valsize -= m->m_len; 1648 (caddr_t)sopt->sopt_val += m->m_len; 1649 m = m->m_next; 1650 } 1651 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1652 panic("ip6_sooptmcopyin"); 1653 return 0; 1654 } 1655 1656 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1657 int 1658 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1659 { 1660 struct mbuf *m0 = m; 1661 size_t valsize = 0; 1662 1663 if (sopt->sopt_val == NULL) 1664 return 0; 1665 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1666 if (sopt->sopt_td != NULL) { 1667 int error; 1668 1669 error = copyout(mtod(m, char *), sopt->sopt_val, 1670 m->m_len); 1671 if (error != 0) { 1672 m_freem(m0); 1673 return(error); 1674 } 1675 } else 1676 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1677 sopt->sopt_valsize -= m->m_len; 1678 (caddr_t)sopt->sopt_val += m->m_len; 1679 valsize += m->m_len; 1680 m = m->m_next; 1681 } 1682 if (m != NULL) { 1683 /* enough soopt buffer should be given from user-land */ 1684 m_freem(m0); 1685 return(EINVAL); 1686 } 1687 sopt->sopt_valsize = valsize; 1688 return 0; 1689 } 1690 1691 void 1692 sohasoutofband(so) 1693 struct socket *so; 1694 { 1695 if (so->so_sigio != NULL) 1696 pgsigio(&so->so_sigio, SIGURG, 0); 1697 selwakeup(&so->so_rcv.sb_sel); 1698 } 1699 1700 int 1701 sopoll(struct socket *so, int events, struct ucred *active_cred, 1702 struct thread *td) 1703 { 1704 int revents = 0; 1705 int s = splnet(); 1706 1707 if (events & (POLLIN | POLLRDNORM)) 1708 if (soreadable(so)) 1709 revents |= events & (POLLIN | POLLRDNORM); 1710 1711 if (events & POLLINIGNEOF) 1712 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat || 1713 !TAILQ_EMPTY(&so->so_comp) || so->so_error) 1714 revents |= POLLINIGNEOF; 1715 1716 if (events & (POLLOUT | POLLWRNORM)) 1717 if (sowriteable(so)) 1718 revents |= events & (POLLOUT | POLLWRNORM); 1719 1720 if (events & (POLLPRI | POLLRDBAND)) 1721 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1722 revents |= events & (POLLPRI | POLLRDBAND); 1723 1724 if (revents == 0) { 1725 if (events & 1726 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | 1727 POLLRDBAND)) { 1728 selrecord(td, &so->so_rcv.sb_sel); 1729 so->so_rcv.sb_flags |= SB_SEL; 1730 } 1731 1732 if (events & (POLLOUT | POLLWRNORM)) { 1733 selrecord(td, &so->so_snd.sb_sel); 1734 so->so_snd.sb_flags |= SB_SEL; 1735 } 1736 } 1737 1738 splx(s); 1739 return (revents); 1740 } 1741 1742 int 1743 soo_kqfilter(struct file *fp, struct knote *kn) 1744 { 1745 struct socket *so = kn->kn_fp->f_data; 1746 struct sockbuf *sb; 1747 int s; 1748 1749 switch (kn->kn_filter) { 1750 case EVFILT_READ: 1751 if (so->so_options & SO_ACCEPTCONN) 1752 kn->kn_fop = &solisten_filtops; 1753 else 1754 kn->kn_fop = &soread_filtops; 1755 sb = &so->so_rcv; 1756 break; 1757 case EVFILT_WRITE: 1758 kn->kn_fop = &sowrite_filtops; 1759 sb = &so->so_snd; 1760 break; 1761 default: 1762 return (1); 1763 } 1764 1765 s = splnet(); 1766 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1767 sb->sb_flags |= SB_KNOTE; 1768 splx(s); 1769 return (0); 1770 } 1771 1772 static void 1773 filt_sordetach(struct knote *kn) 1774 { 1775 struct socket *so = kn->kn_fp->f_data; 1776 int s = splnet(); 1777 1778 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1779 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1780 so->so_rcv.sb_flags &= ~SB_KNOTE; 1781 splx(s); 1782 } 1783 1784 /*ARGSUSED*/ 1785 static int 1786 filt_soread(struct knote *kn, long hint) 1787 { 1788 struct socket *so = kn->kn_fp->f_data; 1789 1790 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 1791 if (so->so_state & SS_CANTRCVMORE) { 1792 kn->kn_flags |= EV_EOF; 1793 kn->kn_fflags = so->so_error; 1794 return (1); 1795 } 1796 if (so->so_error) /* temporary udp error */ 1797 return (1); 1798 if (kn->kn_sfflags & NOTE_LOWAT) 1799 return (kn->kn_data >= kn->kn_sdata); 1800 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat); 1801 } 1802 1803 static void 1804 filt_sowdetach(struct knote *kn) 1805 { 1806 struct socket *so = kn->kn_fp->f_data; 1807 int s = splnet(); 1808 1809 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1810 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1811 so->so_snd.sb_flags &= ~SB_KNOTE; 1812 splx(s); 1813 } 1814 1815 /*ARGSUSED*/ 1816 static int 1817 filt_sowrite(struct knote *kn, long hint) 1818 { 1819 struct socket *so = kn->kn_fp->f_data; 1820 1821 kn->kn_data = sbspace(&so->so_snd); 1822 if (so->so_state & SS_CANTSENDMORE) { 1823 kn->kn_flags |= EV_EOF; 1824 kn->kn_fflags = so->so_error; 1825 return (1); 1826 } 1827 if (so->so_error) /* temporary udp error */ 1828 return (1); 1829 if (((so->so_state & SS_ISCONNECTED) == 0) && 1830 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1831 return (0); 1832 if (kn->kn_sfflags & NOTE_LOWAT) 1833 return (kn->kn_data >= kn->kn_sdata); 1834 return (kn->kn_data >= so->so_snd.sb_lowat); 1835 } 1836 1837 /*ARGSUSED*/ 1838 static int 1839 filt_solisten(struct knote *kn, long hint) 1840 { 1841 struct socket *so = kn->kn_fp->f_data; 1842 1843 kn->kn_data = so->so_qlen; 1844 return (! TAILQ_EMPTY(&so->so_comp)); 1845 } 1846 1847 int 1848 socheckuid(struct socket *so, uid_t uid) 1849 { 1850 1851 if (so == NULL) 1852 return (EPERM); 1853 if (so->so_cred->cr_uid == uid) 1854 return (0); 1855 return (EPERM); 1856 } 1857