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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 #include "opt_zero.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/fcntl.h> 42 #include <sys/limits.h> 43 #include <sys/lock.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/mutex.h> 48 #include <sys/domain.h> 49 #include <sys/file.h> /* for struct knote */ 50 #include <sys/kernel.h> 51 #include <sys/event.h> 52 #include <sys/poll.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/resourcevar.h> 58 #include <sys/signalvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/uio.h> 61 #include <sys/jail.h> 62 63 #include <vm/uma.h> 64 65 66 #ifdef INET 67 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 68 #endif 69 70 static void filt_sordetach(struct knote *kn); 71 static int filt_soread(struct knote *kn, long hint); 72 static void filt_sowdetach(struct knote *kn); 73 static int filt_sowrite(struct knote *kn, long hint); 74 static int filt_solisten(struct knote *kn, long hint); 75 76 static struct filterops solisten_filtops = 77 { 1, NULL, filt_sordetach, filt_solisten }; 78 static struct filterops soread_filtops = 79 { 1, NULL, filt_sordetach, filt_soread }; 80 static struct filterops sowrite_filtops = 81 { 1, NULL, filt_sowdetach, filt_sowrite }; 82 83 uma_zone_t socket_zone; 84 so_gen_t so_gencnt; /* generation count for sockets */ 85 86 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 87 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 88 89 SYSCTL_DECL(_kern_ipc); 90 91 static int somaxconn = SOMAXCONN; 92 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 93 &somaxconn, 0, "Maximum pending socket connection queue size"); 94 static int numopensockets; 95 SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD, 96 &numopensockets, 0, "Number of open sockets"); 97 #ifdef ZERO_COPY_SOCKETS 98 /* These aren't static because they're used in other files. */ 99 int so_zero_copy_send = 1; 100 int so_zero_copy_receive = 1; 101 SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0, 102 "Zero copy controls"); 103 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW, 104 &so_zero_copy_receive, 0, "Enable zero copy receive"); 105 SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW, 106 &so_zero_copy_send, 0, "Enable zero copy send"); 107 #endif /* ZERO_COPY_SOCKETS */ 108 109 110 /* 111 * Socket operation routines. 112 * These routines are called by the routines in 113 * sys_socket.c or from a system process, and 114 * implement the semantics of socket operations by 115 * switching out to the protocol specific routines. 116 */ 117 118 /* 119 * Get a socket structure from our zone, and initialize it. 120 * Note that it would probably be better to allocate socket 121 * and PCB at the same time, but I'm not convinced that all 122 * the protocols can be easily modified to do this. 123 * 124 * soalloc() returns a socket with a ref count of 0. 125 */ 126 struct socket * 127 soalloc(int mflags) 128 { 129 struct socket *so; 130 #ifdef MAC 131 int error; 132 #endif 133 134 so = uma_zalloc(socket_zone, mflags | M_ZERO); 135 if (so != NULL) { 136 #ifdef MAC 137 error = mac_init_socket(so, mflags); 138 if (error != 0) { 139 uma_zfree(socket_zone, so); 140 so = NULL; 141 return so; 142 } 143 #endif 144 /* XXX race condition for reentrant kernel */ 145 so->so_gencnt = ++so_gencnt; 146 /* sx_init(&so->so_sxlock, "socket sxlock"); */ 147 TAILQ_INIT(&so->so_aiojobq); 148 ++numopensockets; 149 } 150 return so; 151 } 152 153 /* 154 * socreate returns a socket with a ref count of 1. The socket should be 155 * closed with soclose(). 156 */ 157 int 158 socreate(dom, aso, type, proto, cred, td) 159 int dom; 160 struct socket **aso; 161 int type; 162 int proto; 163 struct ucred *cred; 164 struct thread *td; 165 { 166 struct protosw *prp; 167 struct socket *so; 168 int error; 169 170 if (proto) 171 prp = pffindproto(dom, proto, type); 172 else 173 prp = pffindtype(dom, type); 174 175 if (prp == NULL || prp->pr_usrreqs->pru_attach == NULL) 176 return (EPROTONOSUPPORT); 177 178 if (jailed(cred) && jail_socket_unixiproute_only && 179 prp->pr_domain->dom_family != PF_LOCAL && 180 prp->pr_domain->dom_family != PF_INET && 181 prp->pr_domain->dom_family != PF_ROUTE) { 182 return (EPROTONOSUPPORT); 183 } 184 185 if (prp->pr_type != type) 186 return (EPROTOTYPE); 187 so = soalloc(M_WAITOK); 188 if (so == NULL) 189 return (ENOBUFS); 190 191 TAILQ_INIT(&so->so_incomp); 192 TAILQ_INIT(&so->so_comp); 193 so->so_type = type; 194 so->so_cred = crhold(cred); 195 so->so_proto = prp; 196 #ifdef MAC 197 mac_create_socket(cred, so); 198 #endif 199 soref(so); 200 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td); 201 if (error) { 202 so->so_state |= SS_NOFDREF; 203 sorele(so); 204 return (error); 205 } 206 *aso = so; 207 return (0); 208 } 209 210 int 211 sobind(so, nam, td) 212 struct socket *so; 213 struct sockaddr *nam; 214 struct thread *td; 215 { 216 int s = splnet(); 217 int error; 218 219 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td); 220 splx(s); 221 return (error); 222 } 223 224 void 225 sodealloc(struct socket *so) 226 { 227 228 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count)); 229 so->so_gencnt = ++so_gencnt; 230 if (so->so_rcv.sb_hiwat) 231 (void)chgsbsize(so->so_cred->cr_uidinfo, 232 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY); 233 if (so->so_snd.sb_hiwat) 234 (void)chgsbsize(so->so_cred->cr_uidinfo, 235 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY); 236 #ifdef INET 237 /* remove acccept filter if one is present. */ 238 if (so->so_accf != NULL) 239 do_setopt_accept_filter(so, NULL); 240 #endif 241 #ifdef MAC 242 mac_destroy_socket(so); 243 #endif 244 crfree(so->so_cred); 245 /* sx_destroy(&so->so_sxlock); */ 246 uma_zfree(socket_zone, so); 247 --numopensockets; 248 } 249 250 int 251 solisten(so, backlog, td) 252 struct socket *so; 253 int backlog; 254 struct thread *td; 255 { 256 int s, error; 257 258 s = splnet(); 259 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING | 260 SS_ISDISCONNECTING)) { 261 splx(s); 262 return (EINVAL); 263 } 264 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td); 265 if (error) { 266 splx(s); 267 return (error); 268 } 269 if (TAILQ_EMPTY(&so->so_comp)) 270 so->so_options |= SO_ACCEPTCONN; 271 if (backlog < 0 || backlog > somaxconn) 272 backlog = somaxconn; 273 so->so_qlimit = backlog; 274 splx(s); 275 return (0); 276 } 277 278 void 279 sofree(so) 280 struct socket *so; 281 { 282 struct socket *head; 283 int s; 284 285 KASSERT(so->so_count == 0, ("socket %p so_count not 0", so)); 286 287 if (so->so_pcb != NULL || (so->so_state & SS_NOFDREF) == 0) 288 return; 289 if (so->so_head != NULL) { 290 head = so->so_head; 291 if (so->so_state & SS_INCOMP) { 292 TAILQ_REMOVE(&head->so_incomp, so, so_list); 293 head->so_incqlen--; 294 } else if (so->so_state & SS_COMP) { 295 /* 296 * We must not decommission a socket that's 297 * on the accept(2) queue. If we do, then 298 * accept(2) may hang after select(2) indicated 299 * that the listening socket was ready. 300 */ 301 return; 302 } else { 303 panic("sofree: not queued"); 304 } 305 so->so_state &= ~SS_INCOMP; 306 so->so_head = NULL; 307 } 308 so->so_snd.sb_flags |= SB_NOINTR; 309 (void)sblock(&so->so_snd, M_WAITOK); 310 s = splimp(); 311 socantsendmore(so); 312 splx(s); 313 sbunlock(&so->so_snd); 314 sbrelease(&so->so_snd, so); 315 sorflush(so); 316 sodealloc(so); 317 } 318 319 /* 320 * Close a socket on last file table reference removal. 321 * Initiate disconnect if connected. 322 * Free socket when disconnect complete. 323 * 324 * This function will sorele() the socket. Note that soclose() may be 325 * called prior to the ref count reaching zero. The actual socket 326 * structure will not be freed until the ref count reaches zero. 327 */ 328 int 329 soclose(so) 330 struct socket *so; 331 { 332 int s = splnet(); /* conservative */ 333 int error = 0; 334 335 funsetown(&so->so_sigio); 336 if (so->so_options & SO_ACCEPTCONN) { 337 struct socket *sp, *sonext; 338 339 sp = TAILQ_FIRST(&so->so_incomp); 340 for (; sp != NULL; sp = sonext) { 341 sonext = TAILQ_NEXT(sp, so_list); 342 (void) soabort(sp); 343 } 344 for (sp = TAILQ_FIRST(&so->so_comp); sp != NULL; sp = sonext) { 345 sonext = TAILQ_NEXT(sp, so_list); 346 /* Dequeue from so_comp since sofree() won't do it */ 347 TAILQ_REMOVE(&so->so_comp, sp, so_list); 348 so->so_qlen--; 349 sp->so_state &= ~SS_COMP; 350 sp->so_head = NULL; 351 (void) soabort(sp); 352 } 353 } 354 if (so->so_pcb == NULL) 355 goto discard; 356 if (so->so_state & SS_ISCONNECTED) { 357 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 358 error = sodisconnect(so); 359 if (error) 360 goto drop; 361 } 362 if (so->so_options & SO_LINGER) { 363 if ((so->so_state & SS_ISDISCONNECTING) && 364 (so->so_state & SS_NBIO)) 365 goto drop; 366 while (so->so_state & SS_ISCONNECTED) { 367 error = tsleep(&so->so_timeo, 368 PSOCK | PCATCH, "soclos", so->so_linger * hz); 369 if (error) 370 break; 371 } 372 } 373 } 374 drop: 375 if (so->so_pcb != NULL) { 376 int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); 377 if (error == 0) 378 error = error2; 379 } 380 discard: 381 if (so->so_state & SS_NOFDREF) 382 panic("soclose: NOFDREF"); 383 so->so_state |= SS_NOFDREF; 384 sorele(so); 385 splx(s); 386 return (error); 387 } 388 389 /* 390 * Must be called at splnet... 391 */ 392 int 393 soabort(so) 394 struct socket *so; 395 { 396 int error; 397 398 error = (*so->so_proto->pr_usrreqs->pru_abort)(so); 399 if (error) { 400 sotryfree(so); /* note: does not decrement the ref count */ 401 return error; 402 } 403 return (0); 404 } 405 406 int 407 soaccept(so, nam) 408 struct socket *so; 409 struct sockaddr **nam; 410 { 411 int s = splnet(); 412 int error; 413 414 if ((so->so_state & SS_NOFDREF) == 0) 415 panic("soaccept: !NOFDREF"); 416 so->so_state &= ~SS_NOFDREF; 417 error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam); 418 splx(s); 419 return (error); 420 } 421 422 int 423 soconnect(so, nam, td) 424 struct socket *so; 425 struct sockaddr *nam; 426 struct thread *td; 427 { 428 int s; 429 int error; 430 431 if (so->so_options & SO_ACCEPTCONN) 432 return (EOPNOTSUPP); 433 s = splnet(); 434 /* 435 * If protocol is connection-based, can only connect once. 436 * Otherwise, if connected, try to disconnect first. 437 * This allows user to disconnect by connecting to, e.g., 438 * a null address. 439 */ 440 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 441 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 442 (error = sodisconnect(so)))) 443 error = EISCONN; 444 else 445 error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td); 446 splx(s); 447 return (error); 448 } 449 450 int 451 soconnect2(so1, so2) 452 struct socket *so1; 453 struct socket *so2; 454 { 455 int s = splnet(); 456 int error; 457 458 error = (*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2); 459 splx(s); 460 return (error); 461 } 462 463 int 464 sodisconnect(so) 465 struct socket *so; 466 { 467 int s = splnet(); 468 int error; 469 470 if ((so->so_state & SS_ISCONNECTED) == 0) { 471 error = ENOTCONN; 472 goto bad; 473 } 474 if (so->so_state & SS_ISDISCONNECTING) { 475 error = EALREADY; 476 goto bad; 477 } 478 error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so); 479 bad: 480 splx(s); 481 return (error); 482 } 483 484 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 485 /* 486 * Send on a socket. 487 * If send must go all at once and message is larger than 488 * send buffering, then hard error. 489 * Lock against other senders. 490 * If must go all at once and not enough room now, then 491 * inform user that this would block and do nothing. 492 * Otherwise, if nonblocking, send as much as possible. 493 * The data to be sent is described by "uio" if nonzero, 494 * otherwise by the mbuf chain "top" (which must be null 495 * if uio is not). Data provided in mbuf chain must be small 496 * enough to send all at once. 497 * 498 * Returns nonzero on error, timeout or signal; callers 499 * must check for short counts if EINTR/ERESTART are returned. 500 * Data and control buffers are freed on return. 501 */ 502 503 #ifdef ZERO_COPY_SOCKETS 504 struct so_zerocopy_stats{ 505 int size_ok; 506 int align_ok; 507 int found_ifp; 508 }; 509 struct so_zerocopy_stats so_zerocp_stats = {0,0,0}; 510 #include <netinet/in.h> 511 #include <net/route.h> 512 #include <netinet/in_pcb.h> 513 #include <vm/vm.h> 514 #include <vm/vm_page.h> 515 #include <vm/vm_object.h> 516 #endif /*ZERO_COPY_SOCKETS*/ 517 518 int 519 sosend(so, addr, uio, top, control, flags, td) 520 struct socket *so; 521 struct sockaddr *addr; 522 struct uio *uio; 523 struct mbuf *top; 524 struct mbuf *control; 525 int flags; 526 struct thread *td; 527 { 528 struct mbuf **mp; 529 struct mbuf *m; 530 long space, len, resid; 531 int clen = 0, error, s, dontroute, mlen; 532 int atomic = sosendallatonce(so) || top; 533 #ifdef ZERO_COPY_SOCKETS 534 int cow_send; 535 #endif /* ZERO_COPY_SOCKETS */ 536 537 if (uio != NULL) 538 resid = uio->uio_resid; 539 else 540 resid = top->m_pkthdr.len; 541 /* 542 * In theory resid should be unsigned. 543 * However, space must be signed, as it might be less than 0 544 * if we over-committed, and we must use a signed comparison 545 * of space and resid. On the other hand, a negative resid 546 * causes us to loop sending 0-length segments to the protocol. 547 * 548 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM 549 * type sockets since that's an error. 550 */ 551 if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { 552 error = EINVAL; 553 goto out; 554 } 555 556 dontroute = 557 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 558 (so->so_proto->pr_flags & PR_ATOMIC); 559 if (td != NULL) 560 td->td_proc->p_stats->p_ru.ru_msgsnd++; 561 if (control != NULL) 562 clen = control->m_len; 563 #define snderr(errno) { error = (errno); splx(s); goto release; } 564 565 restart: 566 error = sblock(&so->so_snd, SBLOCKWAIT(flags)); 567 if (error) 568 goto out; 569 do { 570 s = splnet(); 571 if (so->so_state & SS_CANTSENDMORE) 572 snderr(EPIPE); 573 if (so->so_error) { 574 error = so->so_error; 575 so->so_error = 0; 576 splx(s); 577 goto release; 578 } 579 if ((so->so_state & SS_ISCONNECTED) == 0) { 580 /* 581 * `sendto' and `sendmsg' is allowed on a connection- 582 * based socket if it supports implied connect. 583 * Return ENOTCONN if not connected and no address is 584 * supplied. 585 */ 586 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && 587 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { 588 if ((so->so_state & SS_ISCONFIRMING) == 0 && 589 !(resid == 0 && clen != 0)) 590 snderr(ENOTCONN); 591 } else if (addr == NULL) 592 snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ? 593 ENOTCONN : EDESTADDRREQ); 594 } 595 space = sbspace(&so->so_snd); 596 if (flags & MSG_OOB) 597 space += 1024; 598 if ((atomic && resid > so->so_snd.sb_hiwat) || 599 clen > so->so_snd.sb_hiwat) 600 snderr(EMSGSIZE); 601 if (space < resid + clen && 602 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 603 if (so->so_state & SS_NBIO) 604 snderr(EWOULDBLOCK); 605 sbunlock(&so->so_snd); 606 error = sbwait(&so->so_snd); 607 splx(s); 608 if (error) 609 goto out; 610 goto restart; 611 } 612 splx(s); 613 mp = ⊤ 614 space -= clen; 615 do { 616 if (uio == NULL) { 617 /* 618 * Data is prepackaged in "top". 619 */ 620 resid = 0; 621 if (flags & MSG_EOR) 622 top->m_flags |= M_EOR; 623 } else do { 624 #ifdef ZERO_COPY_SOCKETS 625 cow_send = 0; 626 #endif /* ZERO_COPY_SOCKETS */ 627 if (top == 0) { 628 MGETHDR(m, M_TRYWAIT, MT_DATA); 629 if (m == NULL) { 630 error = ENOBUFS; 631 goto release; 632 } 633 mlen = MHLEN; 634 m->m_pkthdr.len = 0; 635 m->m_pkthdr.rcvif = (struct ifnet *)0; 636 } else { 637 MGET(m, M_TRYWAIT, MT_DATA); 638 if (m == NULL) { 639 error = ENOBUFS; 640 goto release; 641 } 642 mlen = MLEN; 643 } 644 if (resid >= MINCLSIZE) { 645 #ifdef ZERO_COPY_SOCKETS 646 if (so_zero_copy_send && 647 resid>=PAGE_SIZE && 648 space>=PAGE_SIZE && 649 uio->uio_iov->iov_len>=PAGE_SIZE) { 650 so_zerocp_stats.size_ok++; 651 if (!((vm_offset_t) 652 uio->uio_iov->iov_base & PAGE_MASK)){ 653 so_zerocp_stats.align_ok++; 654 cow_send = socow_setup(m, uio); 655 } 656 } 657 if (!cow_send){ 658 #endif /* ZERO_COPY_SOCKETS */ 659 MCLGET(m, M_TRYWAIT); 660 if ((m->m_flags & M_EXT) == 0) 661 goto nopages; 662 mlen = MCLBYTES; 663 len = min(min(mlen, resid), space); 664 } else { 665 #ifdef ZERO_COPY_SOCKETS 666 len = PAGE_SIZE; 667 } 668 669 } else { 670 #endif /* ZERO_COPY_SOCKETS */ 671 nopages: 672 len = min(min(mlen, resid), space); 673 /* 674 * For datagram protocols, leave room 675 * for protocol headers in first mbuf. 676 */ 677 if (atomic && top == 0 && len < mlen) 678 MH_ALIGN(m, len); 679 } 680 space -= len; 681 #ifdef ZERO_COPY_SOCKETS 682 if (cow_send) 683 error = 0; 684 else 685 #endif /* ZERO_COPY_SOCKETS */ 686 error = uiomove(mtod(m, void *), (int)len, uio); 687 resid = uio->uio_resid; 688 m->m_len = len; 689 *mp = m; 690 top->m_pkthdr.len += len; 691 if (error) 692 goto release; 693 mp = &m->m_next; 694 if (resid <= 0) { 695 if (flags & MSG_EOR) 696 top->m_flags |= M_EOR; 697 break; 698 } 699 } while (space > 0 && atomic); 700 if (dontroute) 701 so->so_options |= SO_DONTROUTE; 702 s = splnet(); /* XXX */ 703 /* 704 * XXX all the SS_CANTSENDMORE checks previously 705 * done could be out of date. We could have recieved 706 * a reset packet in an interrupt or maybe we slept 707 * while doing page faults in uiomove() etc. We could 708 * probably recheck again inside the splnet() protection 709 * here, but there are probably other places that this 710 * also happens. We must rethink this. 711 */ 712 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 713 (flags & MSG_OOB) ? PRUS_OOB : 714 /* 715 * If the user set MSG_EOF, the protocol 716 * understands this flag and nothing left to 717 * send then use PRU_SEND_EOF instead of PRU_SEND. 718 */ 719 ((flags & MSG_EOF) && 720 (so->so_proto->pr_flags & PR_IMPLOPCL) && 721 (resid <= 0)) ? 722 PRUS_EOF : 723 /* If there is more to send set PRUS_MORETOCOME */ 724 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0, 725 top, addr, control, td); 726 splx(s); 727 if (dontroute) 728 so->so_options &= ~SO_DONTROUTE; 729 clen = 0; 730 control = NULL; 731 top = NULL; 732 mp = ⊤ 733 if (error) 734 goto release; 735 } while (resid && space > 0); 736 } while (resid); 737 738 release: 739 sbunlock(&so->so_snd); 740 out: 741 if (top != NULL) 742 m_freem(top); 743 if (control != NULL) 744 m_freem(control); 745 return (error); 746 } 747 748 /* 749 * Implement receive operations on a socket. 750 * We depend on the way that records are added to the sockbuf 751 * by sbappend*. In particular, each record (mbufs linked through m_next) 752 * must begin with an address if the protocol so specifies, 753 * followed by an optional mbuf or mbufs containing ancillary data, 754 * and then zero or more mbufs of data. 755 * In order to avoid blocking network interrupts for the entire time here, 756 * we splx() while doing the actual copy to user space. 757 * Although the sockbuf is locked, new data may still be appended, 758 * and thus we must maintain consistency of the sockbuf during that time. 759 * 760 * The caller may receive the data as a single mbuf chain by supplying 761 * an mbuf **mp0 for use in returning the chain. The uio is then used 762 * only for the count in uio_resid. 763 */ 764 int 765 soreceive(so, psa, uio, mp0, controlp, flagsp) 766 struct socket *so; 767 struct sockaddr **psa; 768 struct uio *uio; 769 struct mbuf **mp0; 770 struct mbuf **controlp; 771 int *flagsp; 772 { 773 struct mbuf *m, **mp; 774 int flags, len, error, s, offset; 775 struct protosw *pr = so->so_proto; 776 struct mbuf *nextrecord; 777 int moff, type = 0; 778 int orig_resid = uio->uio_resid; 779 780 mp = mp0; 781 if (psa != NULL) 782 *psa = 0; 783 if (controlp != NULL) 784 *controlp = 0; 785 if (flagsp != NULL) 786 flags = *flagsp &~ MSG_EOR; 787 else 788 flags = 0; 789 if (flags & MSG_OOB) { 790 m = m_get(M_TRYWAIT, MT_DATA); 791 if (m == NULL) 792 return (ENOBUFS); 793 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); 794 if (error) 795 goto bad; 796 do { 797 #ifdef ZERO_COPY_SOCKETS 798 if (so_zero_copy_receive) { 799 vm_page_t pg; 800 int disposable; 801 802 if ((m->m_flags & M_EXT) 803 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 804 disposable = 1; 805 else 806 disposable = 0; 807 808 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t))); 809 if (uio->uio_offset == -1) 810 uio->uio_offset =IDX_TO_OFF(pg->pindex); 811 812 error = uiomoveco(mtod(m, void *), 813 min(uio->uio_resid, m->m_len), 814 uio, pg->object, 815 disposable); 816 } else 817 #endif /* ZERO_COPY_SOCKETS */ 818 error = uiomove(mtod(m, void *), 819 (int) min(uio->uio_resid, m->m_len), uio); 820 m = m_free(m); 821 } while (uio->uio_resid && error == 0 && m); 822 bad: 823 if (m != NULL) 824 m_freem(m); 825 return (error); 826 } 827 if (mp != NULL) 828 *mp = NULL; 829 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 830 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 831 832 restart: 833 error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); 834 if (error) 835 return (error); 836 s = splnet(); 837 838 m = so->so_rcv.sb_mb; 839 /* 840 * If we have less data than requested, block awaiting more 841 * (subject to any timeout) if: 842 * 1. the current count is less than the low water mark, or 843 * 2. MSG_WAITALL is set, and it is possible to do the entire 844 * receive operation at once if we block (resid <= hiwat). 845 * 3. MSG_DONTWAIT is not set 846 * If MSG_WAITALL is set but resid is larger than the receive buffer, 847 * we have to do the receive in sections, and thus risk returning 848 * a short count if a timeout or signal occurs after we start. 849 */ 850 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 && 851 so->so_rcv.sb_cc < uio->uio_resid) && 852 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 853 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 854 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) { 855 KASSERT(m != NULL || !so->so_rcv.sb_cc, 856 ("receive: m == %p so->so_rcv.sb_cc == %u", 857 m, so->so_rcv.sb_cc)); 858 if (so->so_error) { 859 if (m != NULL) 860 goto dontblock; 861 error = so->so_error; 862 if ((flags & MSG_PEEK) == 0) 863 so->so_error = 0; 864 goto release; 865 } 866 if (so->so_state & SS_CANTRCVMORE) { 867 if (m) 868 goto dontblock; 869 else 870 goto release; 871 } 872 for (; m != NULL; m = m->m_next) 873 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 874 m = so->so_rcv.sb_mb; 875 goto dontblock; 876 } 877 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 878 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 879 error = ENOTCONN; 880 goto release; 881 } 882 if (uio->uio_resid == 0) 883 goto release; 884 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 885 error = EWOULDBLOCK; 886 goto release; 887 } 888 SBLASTRECORDCHK(&so->so_rcv); 889 SBLASTMBUFCHK(&so->so_rcv); 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 SBLASTRECORDCHK(&so->so_rcv); 901 SBLASTMBUFCHK(&so->so_rcv); 902 nextrecord = m->m_nextpkt; 903 if (pr->pr_flags & PR_ADDR) { 904 KASSERT(m->m_type == MT_SONAME, 905 ("m->m_type == %d", m->m_type)); 906 orig_resid = 0; 907 if (psa != NULL) 908 *psa = sodupsockaddr(mtod(m, struct sockaddr *), 909 mp0 == NULL ? M_WAITOK : M_NOWAIT); 910 if (flags & MSG_PEEK) { 911 m = m->m_next; 912 } else { 913 sbfree(&so->so_rcv, m); 914 so->so_rcv.sb_mb = m_free(m); 915 m = so->so_rcv.sb_mb; 916 } 917 } 918 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 919 if (flags & MSG_PEEK) { 920 if (controlp != NULL) 921 *controlp = m_copy(m, 0, m->m_len); 922 m = m->m_next; 923 } else { 924 sbfree(&so->so_rcv, m); 925 so->so_rcv.sb_mb = m->m_next; 926 m->m_next = NULL; 927 if (pr->pr_domain->dom_externalize) 928 error = 929 (*pr->pr_domain->dom_externalize)(m, controlp); 930 else if (controlp != NULL) 931 *controlp = m; 932 else 933 m_freem(m); 934 m = so->so_rcv.sb_mb; 935 } 936 if (controlp != NULL) { 937 orig_resid = 0; 938 while (*controlp != NULL) 939 controlp = &(*controlp)->m_next; 940 } 941 } 942 if (m != NULL) { 943 if ((flags & MSG_PEEK) == 0) { 944 m->m_nextpkt = nextrecord; 945 /* 946 * If nextrecord == NULL (this is a single chain), 947 * then sb_lastrecord may not be valid here if m 948 * was changed earlier. 949 */ 950 if (nextrecord == NULL) { 951 KASSERT(so->so_rcv.sb_mb == m, 952 ("receive tailq 1")); 953 so->so_rcv.sb_lastrecord = m; 954 } 955 } 956 type = m->m_type; 957 if (type == MT_OOBDATA) 958 flags |= MSG_OOB; 959 } else { 960 if ((flags & MSG_PEEK) == 0) { 961 KASSERT(so->so_rcv.sb_mb == m,("receive tailq 2")); 962 so->so_rcv.sb_mb = nextrecord; 963 SB_EMPTY_FIXUP(&so->so_rcv); 964 } 965 } 966 SBLASTRECORDCHK(&so->so_rcv); 967 SBLASTMBUFCHK(&so->so_rcv); 968 969 moff = 0; 970 offset = 0; 971 while (m != NULL && uio->uio_resid > 0 && error == 0) { 972 if (m->m_type == MT_OOBDATA) { 973 if (type != MT_OOBDATA) 974 break; 975 } else if (type == MT_OOBDATA) 976 break; 977 else 978 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 979 ("m->m_type == %d", m->m_type)); 980 so->so_state &= ~SS_RCVATMARK; 981 len = uio->uio_resid; 982 if (so->so_oobmark && len > so->so_oobmark - offset) 983 len = so->so_oobmark - offset; 984 if (len > m->m_len - moff) 985 len = m->m_len - moff; 986 /* 987 * If mp is set, just pass back the mbufs. 988 * Otherwise copy them out via the uio, then free. 989 * Sockbuf must be consistent here (points to current mbuf, 990 * it points to next record) when we drop priority; 991 * we must note any additions to the sockbuf when we 992 * block interrupts again. 993 */ 994 if (mp == NULL) { 995 SBLASTRECORDCHK(&so->so_rcv); 996 SBLASTMBUFCHK(&so->so_rcv); 997 splx(s); 998 #ifdef ZERO_COPY_SOCKETS 999 if (so_zero_copy_receive) { 1000 vm_page_t pg; 1001 int disposable; 1002 1003 if ((m->m_flags & M_EXT) 1004 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 1005 disposable = 1; 1006 else 1007 disposable = 0; 1008 1009 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) + 1010 moff)); 1011 1012 if (uio->uio_offset == -1) 1013 uio->uio_offset =IDX_TO_OFF(pg->pindex); 1014 1015 error = uiomoveco(mtod(m, char *) + moff, 1016 (int)len, uio,pg->object, 1017 disposable); 1018 } else 1019 #endif /* ZERO_COPY_SOCKETS */ 1020 error = uiomove(mtod(m, char *) + moff, (int)len, uio); 1021 s = splnet(); 1022 if (error) 1023 goto release; 1024 } else 1025 uio->uio_resid -= len; 1026 if (len == m->m_len - moff) { 1027 if (m->m_flags & M_EOR) 1028 flags |= MSG_EOR; 1029 if (flags & MSG_PEEK) { 1030 m = m->m_next; 1031 moff = 0; 1032 } else { 1033 nextrecord = m->m_nextpkt; 1034 sbfree(&so->so_rcv, m); 1035 if (mp != NULL) { 1036 *mp = m; 1037 mp = &m->m_next; 1038 so->so_rcv.sb_mb = m = m->m_next; 1039 *mp = NULL; 1040 } else { 1041 so->so_rcv.sb_mb = m_free(m); 1042 m = so->so_rcv.sb_mb; 1043 } 1044 if (m != NULL) { 1045 m->m_nextpkt = nextrecord; 1046 if (nextrecord == NULL) 1047 so->so_rcv.sb_lastrecord = m; 1048 } else { 1049 so->so_rcv.sb_mb = nextrecord; 1050 SB_EMPTY_FIXUP(&so->so_rcv); 1051 } 1052 SBLASTRECORDCHK(&so->so_rcv); 1053 SBLASTMBUFCHK(&so->so_rcv); 1054 } 1055 } else { 1056 if (flags & MSG_PEEK) 1057 moff += len; 1058 else { 1059 if (mp != NULL) 1060 *mp = m_copym(m, 0, len, M_TRYWAIT); 1061 m->m_data += len; 1062 m->m_len -= len; 1063 so->so_rcv.sb_cc -= len; 1064 } 1065 } 1066 if (so->so_oobmark) { 1067 if ((flags & MSG_PEEK) == 0) { 1068 so->so_oobmark -= len; 1069 if (so->so_oobmark == 0) { 1070 so->so_state |= SS_RCVATMARK; 1071 break; 1072 } 1073 } else { 1074 offset += len; 1075 if (offset == so->so_oobmark) 1076 break; 1077 } 1078 } 1079 if (flags & MSG_EOR) 1080 break; 1081 /* 1082 * If the MSG_WAITALL flag is set (for non-atomic socket), 1083 * we must not quit until "uio->uio_resid == 0" or an error 1084 * termination. If a signal/timeout occurs, return 1085 * with a short count but without error. 1086 * Keep sockbuf locked against other readers. 1087 */ 1088 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && 1089 !sosendallatonce(so) && nextrecord == NULL) { 1090 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1091 break; 1092 /* 1093 * Notify the protocol that some data has been 1094 * drained before blocking. 1095 */ 1096 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb != NULL) 1097 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1098 SBLASTRECORDCHK(&so->so_rcv); 1099 SBLASTMBUFCHK(&so->so_rcv); 1100 error = sbwait(&so->so_rcv); 1101 if (error) { 1102 sbunlock(&so->so_rcv); 1103 splx(s); 1104 return (0); 1105 } 1106 m = so->so_rcv.sb_mb; 1107 if (m != NULL) 1108 nextrecord = m->m_nextpkt; 1109 } 1110 } 1111 1112 if (m != NULL && pr->pr_flags & PR_ATOMIC) { 1113 flags |= MSG_TRUNC; 1114 if ((flags & MSG_PEEK) == 0) 1115 (void) sbdroprecord(&so->so_rcv); 1116 } 1117 if ((flags & MSG_PEEK) == 0) { 1118 if (m == NULL) { 1119 /* 1120 * First part is an inline SB_EMPTY_FIXUP(). Second 1121 * part makes sure sb_lastrecord is up-to-date if 1122 * there is still data in the socket buffer. 1123 */ 1124 so->so_rcv.sb_mb = nextrecord; 1125 if (so->so_rcv.sb_mb == NULL) { 1126 so->so_rcv.sb_mbtail = NULL; 1127 so->so_rcv.sb_lastrecord = NULL; 1128 } else if (nextrecord->m_nextpkt == NULL) 1129 so->so_rcv.sb_lastrecord = nextrecord; 1130 } 1131 SBLASTRECORDCHK(&so->so_rcv); 1132 SBLASTMBUFCHK(&so->so_rcv); 1133 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1134 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1135 } 1136 if (orig_resid == uio->uio_resid && orig_resid && 1137 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1138 sbunlock(&so->so_rcv); 1139 splx(s); 1140 goto restart; 1141 } 1142 1143 if (flagsp != NULL) 1144 *flagsp |= flags; 1145 release: 1146 sbunlock(&so->so_rcv); 1147 splx(s); 1148 return (error); 1149 } 1150 1151 int 1152 soshutdown(so, how) 1153 struct socket *so; 1154 int how; 1155 { 1156 struct protosw *pr = so->so_proto; 1157 1158 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1159 return (EINVAL); 1160 1161 if (how != SHUT_WR) 1162 sorflush(so); 1163 if (how != SHUT_RD) 1164 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 1165 return (0); 1166 } 1167 1168 void 1169 sorflush(so) 1170 struct socket *so; 1171 { 1172 struct sockbuf *sb = &so->so_rcv; 1173 struct protosw *pr = so->so_proto; 1174 int s; 1175 struct sockbuf asb; 1176 1177 sb->sb_flags |= SB_NOINTR; 1178 (void) sblock(sb, M_WAITOK); 1179 s = splimp(); 1180 socantrcvmore(so); 1181 sbunlock(sb); 1182 asb = *sb; 1183 /* 1184 * Invalidate/clear most of the sockbuf structure, but keep 1185 * its selinfo structure valid. 1186 */ 1187 bzero(&sb->sb_startzero, 1188 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); 1189 splx(s); 1190 1191 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL) 1192 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1193 sbrelease(&asb, so); 1194 } 1195 1196 #ifdef INET 1197 static int 1198 do_setopt_accept_filter(so, sopt) 1199 struct socket *so; 1200 struct sockopt *sopt; 1201 { 1202 struct accept_filter_arg *afap = NULL; 1203 struct accept_filter *afp; 1204 struct so_accf *af = so->so_accf; 1205 int error = 0; 1206 1207 /* do not set/remove accept filters on non listen sockets */ 1208 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1209 error = EINVAL; 1210 goto out; 1211 } 1212 1213 /* removing the filter */ 1214 if (sopt == NULL) { 1215 if (af != NULL) { 1216 if (af->so_accept_filter != NULL && 1217 af->so_accept_filter->accf_destroy != NULL) { 1218 af->so_accept_filter->accf_destroy(so); 1219 } 1220 if (af->so_accept_filter_str != NULL) { 1221 FREE(af->so_accept_filter_str, M_ACCF); 1222 } 1223 FREE(af, M_ACCF); 1224 so->so_accf = NULL; 1225 } 1226 so->so_options &= ~SO_ACCEPTFILTER; 1227 return (0); 1228 } 1229 /* adding a filter */ 1230 /* must remove previous filter first */ 1231 if (af != NULL) { 1232 error = EINVAL; 1233 goto out; 1234 } 1235 /* don't put large objects on the kernel stack */ 1236 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1237 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1238 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1239 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1240 if (error) 1241 goto out; 1242 afp = accept_filt_get(afap->af_name); 1243 if (afp == NULL) { 1244 error = ENOENT; 1245 goto out; 1246 } 1247 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1248 if (afp->accf_create != NULL) { 1249 if (afap->af_name[0] != '\0') { 1250 int len = strlen(afap->af_name) + 1; 1251 1252 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1253 strcpy(af->so_accept_filter_str, afap->af_name); 1254 } 1255 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1256 if (af->so_accept_filter_arg == NULL) { 1257 FREE(af->so_accept_filter_str, M_ACCF); 1258 FREE(af, M_ACCF); 1259 so->so_accf = NULL; 1260 error = EINVAL; 1261 goto out; 1262 } 1263 } 1264 af->so_accept_filter = afp; 1265 so->so_accf = af; 1266 so->so_options |= SO_ACCEPTFILTER; 1267 out: 1268 if (afap != NULL) 1269 FREE(afap, M_TEMP); 1270 return (error); 1271 } 1272 #endif /* INET */ 1273 1274 /* 1275 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1276 * an additional variant to handle the case where the option value needs 1277 * to be some kind of integer, but not a specific size. 1278 * In addition to their use here, these functions are also called by the 1279 * protocol-level pr_ctloutput() routines. 1280 */ 1281 int 1282 sooptcopyin(sopt, buf, len, minlen) 1283 struct sockopt *sopt; 1284 void *buf; 1285 size_t len; 1286 size_t minlen; 1287 { 1288 size_t valsize; 1289 1290 /* 1291 * If the user gives us more than we wanted, we ignore it, 1292 * but if we don't get the minimum length the caller 1293 * wants, we return EINVAL. On success, sopt->sopt_valsize 1294 * is set to however much we actually retrieved. 1295 */ 1296 if ((valsize = sopt->sopt_valsize) < minlen) 1297 return EINVAL; 1298 if (valsize > len) 1299 sopt->sopt_valsize = valsize = len; 1300 1301 if (sopt->sopt_td != NULL) 1302 return (copyin(sopt->sopt_val, buf, valsize)); 1303 1304 bcopy(sopt->sopt_val, buf, valsize); 1305 return 0; 1306 } 1307 1308 int 1309 sosetopt(so, sopt) 1310 struct socket *so; 1311 struct sockopt *sopt; 1312 { 1313 int error, optval; 1314 struct linger l; 1315 struct timeval tv; 1316 u_long val; 1317 #ifdef MAC 1318 struct mac extmac; 1319 #endif 1320 1321 error = 0; 1322 if (sopt->sopt_level != SOL_SOCKET) { 1323 if (so->so_proto && so->so_proto->pr_ctloutput) 1324 return ((*so->so_proto->pr_ctloutput) 1325 (so, sopt)); 1326 error = ENOPROTOOPT; 1327 } else { 1328 switch (sopt->sopt_name) { 1329 #ifdef INET 1330 case SO_ACCEPTFILTER: 1331 error = do_setopt_accept_filter(so, sopt); 1332 if (error) 1333 goto bad; 1334 break; 1335 #endif 1336 case SO_LINGER: 1337 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1338 if (error) 1339 goto bad; 1340 1341 so->so_linger = l.l_linger; 1342 if (l.l_onoff) 1343 so->so_options |= SO_LINGER; 1344 else 1345 so->so_options &= ~SO_LINGER; 1346 break; 1347 1348 case SO_DEBUG: 1349 case SO_KEEPALIVE: 1350 case SO_DONTROUTE: 1351 case SO_USELOOPBACK: 1352 case SO_BROADCAST: 1353 case SO_REUSEADDR: 1354 case SO_REUSEPORT: 1355 case SO_OOBINLINE: 1356 case SO_TIMESTAMP: 1357 case SO_BINTIME: 1358 case SO_NOSIGPIPE: 1359 error = sooptcopyin(sopt, &optval, sizeof optval, 1360 sizeof optval); 1361 if (error) 1362 goto bad; 1363 if (optval) 1364 so->so_options |= sopt->sopt_name; 1365 else 1366 so->so_options &= ~sopt->sopt_name; 1367 break; 1368 1369 case SO_SNDBUF: 1370 case SO_RCVBUF: 1371 case SO_SNDLOWAT: 1372 case SO_RCVLOWAT: 1373 error = sooptcopyin(sopt, &optval, sizeof optval, 1374 sizeof optval); 1375 if (error) 1376 goto bad; 1377 1378 /* 1379 * Values < 1 make no sense for any of these 1380 * options, so disallow them. 1381 */ 1382 if (optval < 1) { 1383 error = EINVAL; 1384 goto bad; 1385 } 1386 1387 switch (sopt->sopt_name) { 1388 case SO_SNDBUF: 1389 case SO_RCVBUF: 1390 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1391 &so->so_snd : &so->so_rcv, (u_long)optval, 1392 so, curthread) == 0) { 1393 error = ENOBUFS; 1394 goto bad; 1395 } 1396 break; 1397 1398 /* 1399 * Make sure the low-water is never greater than 1400 * the high-water. 1401 */ 1402 case SO_SNDLOWAT: 1403 so->so_snd.sb_lowat = 1404 (optval > so->so_snd.sb_hiwat) ? 1405 so->so_snd.sb_hiwat : optval; 1406 break; 1407 case SO_RCVLOWAT: 1408 so->so_rcv.sb_lowat = 1409 (optval > so->so_rcv.sb_hiwat) ? 1410 so->so_rcv.sb_hiwat : optval; 1411 break; 1412 } 1413 break; 1414 1415 case SO_SNDTIMEO: 1416 case SO_RCVTIMEO: 1417 error = sooptcopyin(sopt, &tv, sizeof tv, 1418 sizeof tv); 1419 if (error) 1420 goto bad; 1421 1422 /* assert(hz > 0); */ 1423 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1424 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1425 error = EDOM; 1426 goto bad; 1427 } 1428 /* assert(tick > 0); */ 1429 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1430 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1431 if (val > SHRT_MAX) { 1432 error = EDOM; 1433 goto bad; 1434 } 1435 if (val == 0 && tv.tv_usec != 0) 1436 val = 1; 1437 1438 switch (sopt->sopt_name) { 1439 case SO_SNDTIMEO: 1440 so->so_snd.sb_timeo = val; 1441 break; 1442 case SO_RCVTIMEO: 1443 so->so_rcv.sb_timeo = val; 1444 break; 1445 } 1446 break; 1447 case SO_LABEL: 1448 #ifdef MAC 1449 error = sooptcopyin(sopt, &extmac, sizeof extmac, 1450 sizeof extmac); 1451 if (error) 1452 goto bad; 1453 error = mac_setsockopt_label(sopt->sopt_td->td_ucred, 1454 so, &extmac); 1455 #else 1456 error = EOPNOTSUPP; 1457 #endif 1458 break; 1459 default: 1460 error = ENOPROTOOPT; 1461 break; 1462 } 1463 if (error == 0 && so->so_proto != NULL && 1464 so->so_proto->pr_ctloutput != NULL) { 1465 (void) ((*so->so_proto->pr_ctloutput) 1466 (so, sopt)); 1467 } 1468 } 1469 bad: 1470 return (error); 1471 } 1472 1473 /* Helper routine for getsockopt */ 1474 int 1475 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len) 1476 { 1477 int error; 1478 size_t valsize; 1479 1480 error = 0; 1481 1482 /* 1483 * Documented get behavior is that we always return a value, 1484 * possibly truncated to fit in the user's buffer. 1485 * Traditional behavior is that we always tell the user 1486 * precisely how much we copied, rather than something useful 1487 * like the total amount we had available for her. 1488 * Note that this interface is not idempotent; the entire answer must 1489 * generated ahead of time. 1490 */ 1491 valsize = min(len, sopt->sopt_valsize); 1492 sopt->sopt_valsize = valsize; 1493 if (sopt->sopt_val != NULL) { 1494 if (sopt->sopt_td != NULL) 1495 error = copyout(buf, sopt->sopt_val, valsize); 1496 else 1497 bcopy(buf, sopt->sopt_val, valsize); 1498 } 1499 return error; 1500 } 1501 1502 int 1503 sogetopt(so, sopt) 1504 struct socket *so; 1505 struct sockopt *sopt; 1506 { 1507 int error, optval; 1508 struct linger l; 1509 struct timeval tv; 1510 #ifdef INET 1511 struct accept_filter_arg *afap; 1512 #endif 1513 #ifdef MAC 1514 struct mac extmac; 1515 #endif 1516 1517 error = 0; 1518 if (sopt->sopt_level != SOL_SOCKET) { 1519 if (so->so_proto && so->so_proto->pr_ctloutput) { 1520 return ((*so->so_proto->pr_ctloutput) 1521 (so, sopt)); 1522 } else 1523 return (ENOPROTOOPT); 1524 } else { 1525 switch (sopt->sopt_name) { 1526 #ifdef INET 1527 case SO_ACCEPTFILTER: 1528 if ((so->so_options & SO_ACCEPTCONN) == 0) 1529 return (EINVAL); 1530 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1531 M_TEMP, M_WAITOK | M_ZERO); 1532 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1533 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1534 if (so->so_accf->so_accept_filter_str != NULL) 1535 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1536 } 1537 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1538 FREE(afap, M_TEMP); 1539 break; 1540 #endif 1541 1542 case SO_LINGER: 1543 l.l_onoff = so->so_options & SO_LINGER; 1544 l.l_linger = so->so_linger; 1545 error = sooptcopyout(sopt, &l, sizeof l); 1546 break; 1547 1548 case SO_USELOOPBACK: 1549 case SO_DONTROUTE: 1550 case SO_DEBUG: 1551 case SO_KEEPALIVE: 1552 case SO_REUSEADDR: 1553 case SO_REUSEPORT: 1554 case SO_BROADCAST: 1555 case SO_OOBINLINE: 1556 case SO_TIMESTAMP: 1557 case SO_BINTIME: 1558 case SO_NOSIGPIPE: 1559 optval = so->so_options & sopt->sopt_name; 1560 integer: 1561 error = sooptcopyout(sopt, &optval, sizeof optval); 1562 break; 1563 1564 case SO_TYPE: 1565 optval = so->so_type; 1566 goto integer; 1567 1568 case SO_ERROR: 1569 optval = so->so_error; 1570 so->so_error = 0; 1571 goto integer; 1572 1573 case SO_SNDBUF: 1574 optval = so->so_snd.sb_hiwat; 1575 goto integer; 1576 1577 case SO_RCVBUF: 1578 optval = so->so_rcv.sb_hiwat; 1579 goto integer; 1580 1581 case SO_SNDLOWAT: 1582 optval = so->so_snd.sb_lowat; 1583 goto integer; 1584 1585 case SO_RCVLOWAT: 1586 optval = so->so_rcv.sb_lowat; 1587 goto integer; 1588 1589 case SO_SNDTIMEO: 1590 case SO_RCVTIMEO: 1591 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1592 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1593 1594 tv.tv_sec = optval / hz; 1595 tv.tv_usec = (optval % hz) * tick; 1596 error = sooptcopyout(sopt, &tv, sizeof tv); 1597 break; 1598 case SO_LABEL: 1599 #ifdef MAC 1600 error = sooptcopyin(sopt, &extmac, sizeof(extmac), 1601 sizeof(extmac)); 1602 if (error) 1603 return (error); 1604 error = mac_getsockopt_label(sopt->sopt_td->td_ucred, 1605 so, &extmac); 1606 if (error) 1607 return (error); 1608 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1609 #else 1610 error = EOPNOTSUPP; 1611 #endif 1612 break; 1613 case SO_PEERLABEL: 1614 #ifdef MAC 1615 error = sooptcopyin(sopt, &extmac, sizeof(extmac), 1616 sizeof(extmac)); 1617 if (error) 1618 return (error); 1619 error = mac_getsockopt_peerlabel( 1620 sopt->sopt_td->td_ucred, so, &extmac); 1621 if (error) 1622 return (error); 1623 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1624 #else 1625 error = EOPNOTSUPP; 1626 #endif 1627 break; 1628 default: 1629 error = ENOPROTOOPT; 1630 break; 1631 } 1632 return (error); 1633 } 1634 } 1635 1636 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1637 int 1638 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1639 { 1640 struct mbuf *m, *m_prev; 1641 int sopt_size = sopt->sopt_valsize; 1642 1643 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1644 if (m == NULL) 1645 return ENOBUFS; 1646 if (sopt_size > MLEN) { 1647 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1648 if ((m->m_flags & M_EXT) == 0) { 1649 m_free(m); 1650 return ENOBUFS; 1651 } 1652 m->m_len = min(MCLBYTES, sopt_size); 1653 } else { 1654 m->m_len = min(MLEN, sopt_size); 1655 } 1656 sopt_size -= m->m_len; 1657 *mp = m; 1658 m_prev = m; 1659 1660 while (sopt_size) { 1661 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1662 if (m == NULL) { 1663 m_freem(*mp); 1664 return ENOBUFS; 1665 } 1666 if (sopt_size > MLEN) { 1667 MCLGET(m, sopt->sopt_td != NULL ? M_TRYWAIT : 1668 M_DONTWAIT); 1669 if ((m->m_flags & M_EXT) == 0) { 1670 m_freem(m); 1671 m_freem(*mp); 1672 return ENOBUFS; 1673 } 1674 m->m_len = min(MCLBYTES, sopt_size); 1675 } else { 1676 m->m_len = min(MLEN, sopt_size); 1677 } 1678 sopt_size -= m->m_len; 1679 m_prev->m_next = m; 1680 m_prev = m; 1681 } 1682 return 0; 1683 } 1684 1685 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1686 int 1687 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1688 { 1689 struct mbuf *m0 = m; 1690 1691 if (sopt->sopt_val == NULL) 1692 return 0; 1693 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1694 if (sopt->sopt_td != NULL) { 1695 int error; 1696 1697 error = copyin(sopt->sopt_val, mtod(m, char *), 1698 m->m_len); 1699 if (error != 0) { 1700 m_freem(m0); 1701 return(error); 1702 } 1703 } else 1704 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1705 sopt->sopt_valsize -= m->m_len; 1706 (caddr_t)sopt->sopt_val += m->m_len; 1707 m = m->m_next; 1708 } 1709 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1710 panic("ip6_sooptmcopyin"); 1711 return 0; 1712 } 1713 1714 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1715 int 1716 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1717 { 1718 struct mbuf *m0 = m; 1719 size_t valsize = 0; 1720 1721 if (sopt->sopt_val == NULL) 1722 return 0; 1723 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1724 if (sopt->sopt_td != NULL) { 1725 int error; 1726 1727 error = copyout(mtod(m, char *), sopt->sopt_val, 1728 m->m_len); 1729 if (error != 0) { 1730 m_freem(m0); 1731 return(error); 1732 } 1733 } else 1734 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1735 sopt->sopt_valsize -= m->m_len; 1736 (caddr_t)sopt->sopt_val += m->m_len; 1737 valsize += m->m_len; 1738 m = m->m_next; 1739 } 1740 if (m != NULL) { 1741 /* enough soopt buffer should be given from user-land */ 1742 m_freem(m0); 1743 return(EINVAL); 1744 } 1745 sopt->sopt_valsize = valsize; 1746 return 0; 1747 } 1748 1749 void 1750 sohasoutofband(so) 1751 struct socket *so; 1752 { 1753 if (so->so_sigio != NULL) 1754 pgsigio(&so->so_sigio, SIGURG, 0); 1755 selwakeuppri(&so->so_rcv.sb_sel, PSOCK); 1756 } 1757 1758 int 1759 sopoll(struct socket *so, int events, struct ucred *active_cred, 1760 struct thread *td) 1761 { 1762 int revents = 0; 1763 int s = splnet(); 1764 1765 if (events & (POLLIN | POLLRDNORM)) 1766 if (soreadable(so)) 1767 revents |= events & (POLLIN | POLLRDNORM); 1768 1769 if (events & POLLINIGNEOF) 1770 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat || 1771 !TAILQ_EMPTY(&so->so_comp) || so->so_error) 1772 revents |= POLLINIGNEOF; 1773 1774 if (events & (POLLOUT | POLLWRNORM)) 1775 if (sowriteable(so)) 1776 revents |= events & (POLLOUT | POLLWRNORM); 1777 1778 if (events & (POLLPRI | POLLRDBAND)) 1779 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1780 revents |= events & (POLLPRI | POLLRDBAND); 1781 1782 if (revents == 0) { 1783 if (events & 1784 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | 1785 POLLRDBAND)) { 1786 selrecord(td, &so->so_rcv.sb_sel); 1787 so->so_rcv.sb_flags |= SB_SEL; 1788 } 1789 1790 if (events & (POLLOUT | POLLWRNORM)) { 1791 selrecord(td, &so->so_snd.sb_sel); 1792 so->so_snd.sb_flags |= SB_SEL; 1793 } 1794 } 1795 1796 splx(s); 1797 return (revents); 1798 } 1799 1800 int 1801 soo_kqfilter(struct file *fp, struct knote *kn) 1802 { 1803 struct socket *so = kn->kn_fp->f_data; 1804 struct sockbuf *sb; 1805 int s; 1806 1807 switch (kn->kn_filter) { 1808 case EVFILT_READ: 1809 if (so->so_options & SO_ACCEPTCONN) 1810 kn->kn_fop = &solisten_filtops; 1811 else 1812 kn->kn_fop = &soread_filtops; 1813 sb = &so->so_rcv; 1814 break; 1815 case EVFILT_WRITE: 1816 kn->kn_fop = &sowrite_filtops; 1817 sb = &so->so_snd; 1818 break; 1819 default: 1820 return (1); 1821 } 1822 1823 s = splnet(); 1824 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1825 sb->sb_flags |= SB_KNOTE; 1826 splx(s); 1827 return (0); 1828 } 1829 1830 static void 1831 filt_sordetach(struct knote *kn) 1832 { 1833 struct socket *so = kn->kn_fp->f_data; 1834 int s = splnet(); 1835 1836 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1837 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1838 so->so_rcv.sb_flags &= ~SB_KNOTE; 1839 splx(s); 1840 } 1841 1842 /*ARGSUSED*/ 1843 static int 1844 filt_soread(struct knote *kn, long hint) 1845 { 1846 struct socket *so = kn->kn_fp->f_data; 1847 int result; 1848 1849 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 1850 if (so->so_state & SS_CANTRCVMORE) { 1851 kn->kn_flags |= EV_EOF; 1852 kn->kn_fflags = so->so_error; 1853 result = 1; 1854 } else if (so->so_error) /* temporary udp error */ 1855 result = 1; 1856 else if (kn->kn_sfflags & NOTE_LOWAT) 1857 result = (kn->kn_data >= kn->kn_sdata); 1858 else 1859 result = (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat); 1860 return (result); 1861 } 1862 1863 static void 1864 filt_sowdetach(struct knote *kn) 1865 { 1866 struct socket *so = kn->kn_fp->f_data; 1867 int s = splnet(); 1868 1869 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1870 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1871 so->so_snd.sb_flags &= ~SB_KNOTE; 1872 splx(s); 1873 } 1874 1875 /*ARGSUSED*/ 1876 static int 1877 filt_sowrite(struct knote *kn, long hint) 1878 { 1879 struct socket *so = kn->kn_fp->f_data; 1880 int result; 1881 1882 kn->kn_data = sbspace(&so->so_snd); 1883 if (so->so_state & SS_CANTSENDMORE) { 1884 kn->kn_flags |= EV_EOF; 1885 kn->kn_fflags = so->so_error; 1886 result = 1; 1887 } else if (so->so_error) /* temporary udp error */ 1888 result = 1; 1889 else if (((so->so_state & SS_ISCONNECTED) == 0) && 1890 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1891 result = 0; 1892 else if (kn->kn_sfflags & NOTE_LOWAT) 1893 result = (kn->kn_data >= kn->kn_sdata); 1894 else 1895 result = (kn->kn_data >= so->so_snd.sb_lowat); 1896 return (result); 1897 } 1898 1899 /*ARGSUSED*/ 1900 static int 1901 filt_solisten(struct knote *kn, long hint) 1902 { 1903 struct socket *so = kn->kn_fp->f_data; 1904 1905 kn->kn_data = so->so_qlen; 1906 return (! TAILQ_EMPTY(&so->so_comp)); 1907 } 1908 1909 int 1910 socheckuid(struct socket *so, uid_t uid) 1911 { 1912 1913 if (so == NULL) 1914 return (EPERM); 1915 if (so->so_cred->cr_uid == uid) 1916 return (0); 1917 return (EPERM); 1918 } 1919