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 = 0, resid; 531 int clen = 0, error, s, dontroute; 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 (resid >= MINCLSIZE) { 628 #ifdef ZERO_COPY_SOCKETS 629 if (top == NULL) { 630 MGETHDR(m, M_TRYWAIT, MT_DATA); 631 if (m == NULL) { 632 error = ENOBUFS; 633 goto release; 634 } 635 m->m_pkthdr.len = 0; 636 m->m_pkthdr.rcvif = (struct ifnet *)0; 637 } else { 638 MGET(m, M_TRYWAIT, MT_DATA); 639 if (m == NULL) { 640 error = ENOBUFS; 641 goto release; 642 } 643 } 644 if (so_zero_copy_send && 645 resid>=PAGE_SIZE && 646 space>=PAGE_SIZE && 647 uio->uio_iov->iov_len>=PAGE_SIZE) { 648 so_zerocp_stats.size_ok++; 649 if (!((vm_offset_t) 650 uio->uio_iov->iov_base & PAGE_MASK)){ 651 so_zerocp_stats.align_ok++; 652 cow_send = socow_setup(m, uio); 653 } 654 } 655 if (!cow_send) { 656 MCLGET(m, M_TRYWAIT); 657 if ((m->m_flags & M_EXT) == 0) { 658 m_free(m); 659 m = NULL; 660 } else { 661 len = min(min(MCLBYTES, resid), space); 662 } 663 } else 664 len = PAGE_SIZE; 665 #else /* ZERO_COPY_SOCKETS */ 666 if (top == NULL) { 667 m = m_getcl(M_TRYWAIT, MT_DATA, M_PKTHDR); 668 m->m_pkthdr.len = 0; 669 m->m_pkthdr.rcvif = (struct ifnet *)0; 670 } else 671 m = m_getcl(M_TRYWAIT, MT_DATA, 0); 672 len = min(min(MCLBYTES, resid), space); 673 #endif /* ZERO_COPY_SOCKETS */ 674 } else { 675 if (top == NULL) { 676 m = m_gethdr(M_TRYWAIT, MT_DATA); 677 m->m_pkthdr.len = 0; 678 m->m_pkthdr.rcvif = (struct ifnet *)0; 679 680 len = min(min(MHLEN, resid), space); 681 /* 682 * For datagram protocols, leave room 683 * for protocol headers in first mbuf. 684 */ 685 if (atomic && m && len < MHLEN) 686 MH_ALIGN(m, len); 687 } else { 688 m = m_get(M_TRYWAIT, MT_DATA); 689 len = min(min(MLEN, resid), space); 690 } 691 } 692 if (m == NULL) { 693 error = ENOBUFS; 694 goto release; 695 } 696 697 space -= len; 698 #ifdef ZERO_COPY_SOCKETS 699 if (cow_send) 700 error = 0; 701 else 702 #endif /* ZERO_COPY_SOCKETS */ 703 error = uiomove(mtod(m, void *), (int)len, uio); 704 resid = uio->uio_resid; 705 m->m_len = len; 706 *mp = m; 707 top->m_pkthdr.len += len; 708 if (error) 709 goto release; 710 mp = &m->m_next; 711 if (resid <= 0) { 712 if (flags & MSG_EOR) 713 top->m_flags |= M_EOR; 714 break; 715 } 716 } while (space > 0 && atomic); 717 if (dontroute) 718 so->so_options |= SO_DONTROUTE; 719 s = splnet(); /* XXX */ 720 /* 721 * XXX all the SS_CANTSENDMORE checks previously 722 * done could be out of date. We could have recieved 723 * a reset packet in an interrupt or maybe we slept 724 * while doing page faults in uiomove() etc. We could 725 * probably recheck again inside the splnet() protection 726 * here, but there are probably other places that this 727 * also happens. We must rethink this. 728 */ 729 error = (*so->so_proto->pr_usrreqs->pru_send)(so, 730 (flags & MSG_OOB) ? PRUS_OOB : 731 /* 732 * If the user set MSG_EOF, the protocol 733 * understands this flag and nothing left to 734 * send then use PRU_SEND_EOF instead of PRU_SEND. 735 */ 736 ((flags & MSG_EOF) && 737 (so->so_proto->pr_flags & PR_IMPLOPCL) && 738 (resid <= 0)) ? 739 PRUS_EOF : 740 /* If there is more to send set PRUS_MORETOCOME */ 741 (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0, 742 top, addr, control, td); 743 splx(s); 744 if (dontroute) 745 so->so_options &= ~SO_DONTROUTE; 746 clen = 0; 747 control = NULL; 748 top = NULL; 749 mp = ⊤ 750 if (error) 751 goto release; 752 } while (resid && space > 0); 753 } while (resid); 754 755 release: 756 sbunlock(&so->so_snd); 757 out: 758 if (top != NULL) 759 m_freem(top); 760 if (control != NULL) 761 m_freem(control); 762 return (error); 763 } 764 765 /* 766 * Implement receive operations on a socket. 767 * We depend on the way that records are added to the sockbuf 768 * by sbappend*. In particular, each record (mbufs linked through m_next) 769 * must begin with an address if the protocol so specifies, 770 * followed by an optional mbuf or mbufs containing ancillary data, 771 * and then zero or more mbufs of data. 772 * In order to avoid blocking network interrupts for the entire time here, 773 * we splx() while doing the actual copy to user space. 774 * Although the sockbuf is locked, new data may still be appended, 775 * and thus we must maintain consistency of the sockbuf during that time. 776 * 777 * The caller may receive the data as a single mbuf chain by supplying 778 * an mbuf **mp0 for use in returning the chain. The uio is then used 779 * only for the count in uio_resid. 780 */ 781 int 782 soreceive(so, psa, uio, mp0, controlp, flagsp) 783 struct socket *so; 784 struct sockaddr **psa; 785 struct uio *uio; 786 struct mbuf **mp0; 787 struct mbuf **controlp; 788 int *flagsp; 789 { 790 struct mbuf *m, **mp; 791 int flags, len, error, s, offset; 792 struct protosw *pr = so->so_proto; 793 struct mbuf *nextrecord; 794 int moff, type = 0; 795 int orig_resid = uio->uio_resid; 796 797 mp = mp0; 798 if (psa != NULL) 799 *psa = 0; 800 if (controlp != NULL) 801 *controlp = 0; 802 if (flagsp != NULL) 803 flags = *flagsp &~ MSG_EOR; 804 else 805 flags = 0; 806 if (flags & MSG_OOB) { 807 m = m_get(M_TRYWAIT, MT_DATA); 808 if (m == NULL) 809 return (ENOBUFS); 810 error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK); 811 if (error) 812 goto bad; 813 do { 814 #ifdef ZERO_COPY_SOCKETS 815 if (so_zero_copy_receive) { 816 vm_page_t pg; 817 int disposable; 818 819 if ((m->m_flags & M_EXT) 820 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 821 disposable = 1; 822 else 823 disposable = 0; 824 825 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t))); 826 if (uio->uio_offset == -1) 827 uio->uio_offset =IDX_TO_OFF(pg->pindex); 828 829 error = uiomoveco(mtod(m, void *), 830 min(uio->uio_resid, m->m_len), 831 uio, pg->object, 832 disposable); 833 } else 834 #endif /* ZERO_COPY_SOCKETS */ 835 error = uiomove(mtod(m, void *), 836 (int) min(uio->uio_resid, m->m_len), uio); 837 m = m_free(m); 838 } while (uio->uio_resid && error == 0 && m); 839 bad: 840 if (m != NULL) 841 m_freem(m); 842 return (error); 843 } 844 if (mp != NULL) 845 *mp = NULL; 846 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 847 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 848 849 restart: 850 error = sblock(&so->so_rcv, SBLOCKWAIT(flags)); 851 if (error) 852 return (error); 853 s = splnet(); 854 855 m = so->so_rcv.sb_mb; 856 /* 857 * If we have less data than requested, block awaiting more 858 * (subject to any timeout) if: 859 * 1. the current count is less than the low water mark, or 860 * 2. MSG_WAITALL is set, and it is possible to do the entire 861 * receive operation at once if we block (resid <= hiwat). 862 * 3. MSG_DONTWAIT is not set 863 * If MSG_WAITALL is set but resid is larger than the receive buffer, 864 * we have to do the receive in sections, and thus risk returning 865 * a short count if a timeout or signal occurs after we start. 866 */ 867 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 && 868 so->so_rcv.sb_cc < uio->uio_resid) && 869 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 870 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 871 m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) { 872 KASSERT(m != NULL || !so->so_rcv.sb_cc, 873 ("receive: m == %p so->so_rcv.sb_cc == %u", 874 m, so->so_rcv.sb_cc)); 875 if (so->so_error) { 876 if (m != NULL) 877 goto dontblock; 878 error = so->so_error; 879 if ((flags & MSG_PEEK) == 0) 880 so->so_error = 0; 881 goto release; 882 } 883 if (so->so_state & SS_CANTRCVMORE) { 884 if (m) 885 goto dontblock; 886 else 887 goto release; 888 } 889 for (; m != NULL; m = m->m_next) 890 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 891 m = so->so_rcv.sb_mb; 892 goto dontblock; 893 } 894 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 895 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 896 error = ENOTCONN; 897 goto release; 898 } 899 if (uio->uio_resid == 0) 900 goto release; 901 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 902 error = EWOULDBLOCK; 903 goto release; 904 } 905 SBLASTRECORDCHK(&so->so_rcv); 906 SBLASTMBUFCHK(&so->so_rcv); 907 sbunlock(&so->so_rcv); 908 error = sbwait(&so->so_rcv); 909 splx(s); 910 if (error) 911 return (error); 912 goto restart; 913 } 914 dontblock: 915 if (uio->uio_td) 916 uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++; 917 SBLASTRECORDCHK(&so->so_rcv); 918 SBLASTMBUFCHK(&so->so_rcv); 919 nextrecord = m->m_nextpkt; 920 if (pr->pr_flags & PR_ADDR) { 921 KASSERT(m->m_type == MT_SONAME, 922 ("m->m_type == %d", m->m_type)); 923 orig_resid = 0; 924 if (psa != NULL) 925 *psa = sodupsockaddr(mtod(m, struct sockaddr *), 926 mp0 == NULL ? M_WAITOK : M_NOWAIT); 927 if (flags & MSG_PEEK) { 928 m = m->m_next; 929 } else { 930 sbfree(&so->so_rcv, m); 931 so->so_rcv.sb_mb = m_free(m); 932 m = so->so_rcv.sb_mb; 933 } 934 } 935 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 936 if (flags & MSG_PEEK) { 937 if (controlp != NULL) 938 *controlp = m_copy(m, 0, m->m_len); 939 m = m->m_next; 940 } else { 941 sbfree(&so->so_rcv, m); 942 so->so_rcv.sb_mb = m->m_next; 943 m->m_next = NULL; 944 if (pr->pr_domain->dom_externalize) 945 error = 946 (*pr->pr_domain->dom_externalize)(m, controlp); 947 else if (controlp != NULL) 948 *controlp = m; 949 else 950 m_freem(m); 951 m = so->so_rcv.sb_mb; 952 } 953 if (controlp != NULL) { 954 orig_resid = 0; 955 while (*controlp != NULL) 956 controlp = &(*controlp)->m_next; 957 } 958 } 959 if (m != NULL) { 960 if ((flags & MSG_PEEK) == 0) { 961 m->m_nextpkt = nextrecord; 962 /* 963 * If nextrecord == NULL (this is a single chain), 964 * then sb_lastrecord may not be valid here if m 965 * was changed earlier. 966 */ 967 if (nextrecord == NULL) { 968 KASSERT(so->so_rcv.sb_mb == m, 969 ("receive tailq 1")); 970 so->so_rcv.sb_lastrecord = m; 971 } 972 } 973 type = m->m_type; 974 if (type == MT_OOBDATA) 975 flags |= MSG_OOB; 976 } else { 977 if ((flags & MSG_PEEK) == 0) { 978 KASSERT(so->so_rcv.sb_mb == m,("receive tailq 2")); 979 so->so_rcv.sb_mb = nextrecord; 980 SB_EMPTY_FIXUP(&so->so_rcv); 981 } 982 } 983 SBLASTRECORDCHK(&so->so_rcv); 984 SBLASTMBUFCHK(&so->so_rcv); 985 986 moff = 0; 987 offset = 0; 988 while (m != NULL && uio->uio_resid > 0 && error == 0) { 989 if (m->m_type == MT_OOBDATA) { 990 if (type != MT_OOBDATA) 991 break; 992 } else if (type == MT_OOBDATA) 993 break; 994 else 995 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 996 ("m->m_type == %d", m->m_type)); 997 so->so_state &= ~SS_RCVATMARK; 998 len = uio->uio_resid; 999 if (so->so_oobmark && len > so->so_oobmark - offset) 1000 len = so->so_oobmark - offset; 1001 if (len > m->m_len - moff) 1002 len = m->m_len - moff; 1003 /* 1004 * If mp is set, just pass back the mbufs. 1005 * Otherwise copy them out via the uio, then free. 1006 * Sockbuf must be consistent here (points to current mbuf, 1007 * it points to next record) when we drop priority; 1008 * we must note any additions to the sockbuf when we 1009 * block interrupts again. 1010 */ 1011 if (mp == NULL) { 1012 SBLASTRECORDCHK(&so->so_rcv); 1013 SBLASTMBUFCHK(&so->so_rcv); 1014 splx(s); 1015 #ifdef ZERO_COPY_SOCKETS 1016 if (so_zero_copy_receive) { 1017 vm_page_t pg; 1018 int disposable; 1019 1020 if ((m->m_flags & M_EXT) 1021 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 1022 disposable = 1; 1023 else 1024 disposable = 0; 1025 1026 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) + 1027 moff)); 1028 1029 if (uio->uio_offset == -1) 1030 uio->uio_offset =IDX_TO_OFF(pg->pindex); 1031 1032 error = uiomoveco(mtod(m, char *) + moff, 1033 (int)len, uio,pg->object, 1034 disposable); 1035 } else 1036 #endif /* ZERO_COPY_SOCKETS */ 1037 error = uiomove(mtod(m, char *) + moff, (int)len, uio); 1038 s = splnet(); 1039 if (error) 1040 goto release; 1041 } else 1042 uio->uio_resid -= len; 1043 if (len == m->m_len - moff) { 1044 if (m->m_flags & M_EOR) 1045 flags |= MSG_EOR; 1046 if (flags & MSG_PEEK) { 1047 m = m->m_next; 1048 moff = 0; 1049 } else { 1050 nextrecord = m->m_nextpkt; 1051 sbfree(&so->so_rcv, m); 1052 if (mp != NULL) { 1053 *mp = m; 1054 mp = &m->m_next; 1055 so->so_rcv.sb_mb = m = m->m_next; 1056 *mp = NULL; 1057 } else { 1058 so->so_rcv.sb_mb = m_free(m); 1059 m = so->so_rcv.sb_mb; 1060 } 1061 if (m != NULL) { 1062 m->m_nextpkt = nextrecord; 1063 if (nextrecord == NULL) 1064 so->so_rcv.sb_lastrecord = m; 1065 } else { 1066 so->so_rcv.sb_mb = nextrecord; 1067 SB_EMPTY_FIXUP(&so->so_rcv); 1068 } 1069 SBLASTRECORDCHK(&so->so_rcv); 1070 SBLASTMBUFCHK(&so->so_rcv); 1071 } 1072 } else { 1073 if (flags & MSG_PEEK) 1074 moff += len; 1075 else { 1076 if (mp != NULL) 1077 *mp = m_copym(m, 0, len, M_TRYWAIT); 1078 m->m_data += len; 1079 m->m_len -= len; 1080 so->so_rcv.sb_cc -= len; 1081 } 1082 } 1083 if (so->so_oobmark) { 1084 if ((flags & MSG_PEEK) == 0) { 1085 so->so_oobmark -= len; 1086 if (so->so_oobmark == 0) { 1087 so->so_state |= SS_RCVATMARK; 1088 break; 1089 } 1090 } else { 1091 offset += len; 1092 if (offset == so->so_oobmark) 1093 break; 1094 } 1095 } 1096 if (flags & MSG_EOR) 1097 break; 1098 /* 1099 * If the MSG_WAITALL flag is set (for non-atomic socket), 1100 * we must not quit until "uio->uio_resid == 0" or an error 1101 * termination. If a signal/timeout occurs, return 1102 * with a short count but without error. 1103 * Keep sockbuf locked against other readers. 1104 */ 1105 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && 1106 !sosendallatonce(so) && nextrecord == NULL) { 1107 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1108 break; 1109 /* 1110 * Notify the protocol that some data has been 1111 * drained before blocking. 1112 */ 1113 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb != NULL) 1114 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1115 SBLASTRECORDCHK(&so->so_rcv); 1116 SBLASTMBUFCHK(&so->so_rcv); 1117 error = sbwait(&so->so_rcv); 1118 if (error) { 1119 sbunlock(&so->so_rcv); 1120 splx(s); 1121 return (0); 1122 } 1123 m = so->so_rcv.sb_mb; 1124 if (m != NULL) 1125 nextrecord = m->m_nextpkt; 1126 } 1127 } 1128 1129 if (m != NULL && pr->pr_flags & PR_ATOMIC) { 1130 flags |= MSG_TRUNC; 1131 if ((flags & MSG_PEEK) == 0) 1132 (void) sbdroprecord(&so->so_rcv); 1133 } 1134 if ((flags & MSG_PEEK) == 0) { 1135 if (m == NULL) { 1136 /* 1137 * First part is an inline SB_EMPTY_FIXUP(). Second 1138 * part makes sure sb_lastrecord is up-to-date if 1139 * there is still data in the socket buffer. 1140 */ 1141 so->so_rcv.sb_mb = nextrecord; 1142 if (so->so_rcv.sb_mb == NULL) { 1143 so->so_rcv.sb_mbtail = NULL; 1144 so->so_rcv.sb_lastrecord = NULL; 1145 } else if (nextrecord->m_nextpkt == NULL) 1146 so->so_rcv.sb_lastrecord = nextrecord; 1147 } 1148 SBLASTRECORDCHK(&so->so_rcv); 1149 SBLASTMBUFCHK(&so->so_rcv); 1150 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1151 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1152 } 1153 if (orig_resid == uio->uio_resid && orig_resid && 1154 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1155 sbunlock(&so->so_rcv); 1156 splx(s); 1157 goto restart; 1158 } 1159 1160 if (flagsp != NULL) 1161 *flagsp |= flags; 1162 release: 1163 sbunlock(&so->so_rcv); 1164 splx(s); 1165 return (error); 1166 } 1167 1168 int 1169 soshutdown(so, how) 1170 struct socket *so; 1171 int how; 1172 { 1173 struct protosw *pr = so->so_proto; 1174 1175 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1176 return (EINVAL); 1177 1178 if (how != SHUT_WR) 1179 sorflush(so); 1180 if (how != SHUT_RD) 1181 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 1182 return (0); 1183 } 1184 1185 void 1186 sorflush(so) 1187 struct socket *so; 1188 { 1189 struct sockbuf *sb = &so->so_rcv; 1190 struct protosw *pr = so->so_proto; 1191 int s; 1192 struct sockbuf asb; 1193 1194 sb->sb_flags |= SB_NOINTR; 1195 (void) sblock(sb, M_WAITOK); 1196 s = splimp(); 1197 socantrcvmore(so); 1198 sbunlock(sb); 1199 asb = *sb; 1200 /* 1201 * Invalidate/clear most of the sockbuf structure, but keep 1202 * its selinfo structure valid. 1203 */ 1204 bzero(&sb->sb_startzero, 1205 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); 1206 splx(s); 1207 1208 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL) 1209 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1210 sbrelease(&asb, so); 1211 } 1212 1213 #ifdef INET 1214 static int 1215 do_setopt_accept_filter(so, sopt) 1216 struct socket *so; 1217 struct sockopt *sopt; 1218 { 1219 struct accept_filter_arg *afap = NULL; 1220 struct accept_filter *afp; 1221 struct so_accf *af = so->so_accf; 1222 int error = 0; 1223 1224 /* do not set/remove accept filters on non listen sockets */ 1225 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1226 error = EINVAL; 1227 goto out; 1228 } 1229 1230 /* removing the filter */ 1231 if (sopt == NULL) { 1232 if (af != NULL) { 1233 if (af->so_accept_filter != NULL && 1234 af->so_accept_filter->accf_destroy != NULL) { 1235 af->so_accept_filter->accf_destroy(so); 1236 } 1237 if (af->so_accept_filter_str != NULL) { 1238 FREE(af->so_accept_filter_str, M_ACCF); 1239 } 1240 FREE(af, M_ACCF); 1241 so->so_accf = NULL; 1242 } 1243 so->so_options &= ~SO_ACCEPTFILTER; 1244 return (0); 1245 } 1246 /* adding a filter */ 1247 /* must remove previous filter first */ 1248 if (af != NULL) { 1249 error = EINVAL; 1250 goto out; 1251 } 1252 /* don't put large objects on the kernel stack */ 1253 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1254 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1255 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1256 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1257 if (error) 1258 goto out; 1259 afp = accept_filt_get(afap->af_name); 1260 if (afp == NULL) { 1261 error = ENOENT; 1262 goto out; 1263 } 1264 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1265 if (afp->accf_create != NULL) { 1266 if (afap->af_name[0] != '\0') { 1267 int len = strlen(afap->af_name) + 1; 1268 1269 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1270 strcpy(af->so_accept_filter_str, afap->af_name); 1271 } 1272 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1273 if (af->so_accept_filter_arg == NULL) { 1274 FREE(af->so_accept_filter_str, M_ACCF); 1275 FREE(af, M_ACCF); 1276 so->so_accf = NULL; 1277 error = EINVAL; 1278 goto out; 1279 } 1280 } 1281 af->so_accept_filter = afp; 1282 so->so_accf = af; 1283 so->so_options |= SO_ACCEPTFILTER; 1284 out: 1285 if (afap != NULL) 1286 FREE(afap, M_TEMP); 1287 return (error); 1288 } 1289 #endif /* INET */ 1290 1291 /* 1292 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1293 * an additional variant to handle the case where the option value needs 1294 * to be some kind of integer, but not a specific size. 1295 * In addition to their use here, these functions are also called by the 1296 * protocol-level pr_ctloutput() routines. 1297 */ 1298 int 1299 sooptcopyin(sopt, buf, len, minlen) 1300 struct sockopt *sopt; 1301 void *buf; 1302 size_t len; 1303 size_t minlen; 1304 { 1305 size_t valsize; 1306 1307 /* 1308 * If the user gives us more than we wanted, we ignore it, 1309 * but if we don't get the minimum length the caller 1310 * wants, we return EINVAL. On success, sopt->sopt_valsize 1311 * is set to however much we actually retrieved. 1312 */ 1313 if ((valsize = sopt->sopt_valsize) < minlen) 1314 return EINVAL; 1315 if (valsize > len) 1316 sopt->sopt_valsize = valsize = len; 1317 1318 if (sopt->sopt_td != NULL) 1319 return (copyin(sopt->sopt_val, buf, valsize)); 1320 1321 bcopy(sopt->sopt_val, buf, valsize); 1322 return 0; 1323 } 1324 1325 int 1326 sosetopt(so, sopt) 1327 struct socket *so; 1328 struct sockopt *sopt; 1329 { 1330 int error, optval; 1331 struct linger l; 1332 struct timeval tv; 1333 u_long val; 1334 #ifdef MAC 1335 struct mac extmac; 1336 #endif 1337 1338 error = 0; 1339 if (sopt->sopt_level != SOL_SOCKET) { 1340 if (so->so_proto && so->so_proto->pr_ctloutput) 1341 return ((*so->so_proto->pr_ctloutput) 1342 (so, sopt)); 1343 error = ENOPROTOOPT; 1344 } else { 1345 switch (sopt->sopt_name) { 1346 #ifdef INET 1347 case SO_ACCEPTFILTER: 1348 error = do_setopt_accept_filter(so, sopt); 1349 if (error) 1350 goto bad; 1351 break; 1352 #endif 1353 case SO_LINGER: 1354 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1355 if (error) 1356 goto bad; 1357 1358 so->so_linger = l.l_linger; 1359 if (l.l_onoff) 1360 so->so_options |= SO_LINGER; 1361 else 1362 so->so_options &= ~SO_LINGER; 1363 break; 1364 1365 case SO_DEBUG: 1366 case SO_KEEPALIVE: 1367 case SO_DONTROUTE: 1368 case SO_USELOOPBACK: 1369 case SO_BROADCAST: 1370 case SO_REUSEADDR: 1371 case SO_REUSEPORT: 1372 case SO_OOBINLINE: 1373 case SO_TIMESTAMP: 1374 case SO_BINTIME: 1375 case SO_NOSIGPIPE: 1376 error = sooptcopyin(sopt, &optval, sizeof optval, 1377 sizeof optval); 1378 if (error) 1379 goto bad; 1380 if (optval) 1381 so->so_options |= sopt->sopt_name; 1382 else 1383 so->so_options &= ~sopt->sopt_name; 1384 break; 1385 1386 case SO_SNDBUF: 1387 case SO_RCVBUF: 1388 case SO_SNDLOWAT: 1389 case SO_RCVLOWAT: 1390 error = sooptcopyin(sopt, &optval, sizeof optval, 1391 sizeof optval); 1392 if (error) 1393 goto bad; 1394 1395 /* 1396 * Values < 1 make no sense for any of these 1397 * options, so disallow them. 1398 */ 1399 if (optval < 1) { 1400 error = EINVAL; 1401 goto bad; 1402 } 1403 1404 switch (sopt->sopt_name) { 1405 case SO_SNDBUF: 1406 case SO_RCVBUF: 1407 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1408 &so->so_snd : &so->so_rcv, (u_long)optval, 1409 so, curthread) == 0) { 1410 error = ENOBUFS; 1411 goto bad; 1412 } 1413 break; 1414 1415 /* 1416 * Make sure the low-water is never greater than 1417 * the high-water. 1418 */ 1419 case SO_SNDLOWAT: 1420 so->so_snd.sb_lowat = 1421 (optval > so->so_snd.sb_hiwat) ? 1422 so->so_snd.sb_hiwat : optval; 1423 break; 1424 case SO_RCVLOWAT: 1425 so->so_rcv.sb_lowat = 1426 (optval > so->so_rcv.sb_hiwat) ? 1427 so->so_rcv.sb_hiwat : optval; 1428 break; 1429 } 1430 break; 1431 1432 case SO_SNDTIMEO: 1433 case SO_RCVTIMEO: 1434 error = sooptcopyin(sopt, &tv, sizeof tv, 1435 sizeof tv); 1436 if (error) 1437 goto bad; 1438 1439 /* assert(hz > 0); */ 1440 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1441 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1442 error = EDOM; 1443 goto bad; 1444 } 1445 /* assert(tick > 0); */ 1446 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1447 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1448 if (val > SHRT_MAX) { 1449 error = EDOM; 1450 goto bad; 1451 } 1452 if (val == 0 && tv.tv_usec != 0) 1453 val = 1; 1454 1455 switch (sopt->sopt_name) { 1456 case SO_SNDTIMEO: 1457 so->so_snd.sb_timeo = val; 1458 break; 1459 case SO_RCVTIMEO: 1460 so->so_rcv.sb_timeo = val; 1461 break; 1462 } 1463 break; 1464 case SO_LABEL: 1465 #ifdef MAC 1466 error = sooptcopyin(sopt, &extmac, sizeof extmac, 1467 sizeof extmac); 1468 if (error) 1469 goto bad; 1470 error = mac_setsockopt_label(sopt->sopt_td->td_ucred, 1471 so, &extmac); 1472 #else 1473 error = EOPNOTSUPP; 1474 #endif 1475 break; 1476 default: 1477 error = ENOPROTOOPT; 1478 break; 1479 } 1480 if (error == 0 && so->so_proto != NULL && 1481 so->so_proto->pr_ctloutput != NULL) { 1482 (void) ((*so->so_proto->pr_ctloutput) 1483 (so, sopt)); 1484 } 1485 } 1486 bad: 1487 return (error); 1488 } 1489 1490 /* Helper routine for getsockopt */ 1491 int 1492 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len) 1493 { 1494 int error; 1495 size_t valsize; 1496 1497 error = 0; 1498 1499 /* 1500 * Documented get behavior is that we always return a value, 1501 * possibly truncated to fit in the user's buffer. 1502 * Traditional behavior is that we always tell the user 1503 * precisely how much we copied, rather than something useful 1504 * like the total amount we had available for her. 1505 * Note that this interface is not idempotent; the entire answer must 1506 * generated ahead of time. 1507 */ 1508 valsize = min(len, sopt->sopt_valsize); 1509 sopt->sopt_valsize = valsize; 1510 if (sopt->sopt_val != NULL) { 1511 if (sopt->sopt_td != NULL) 1512 error = copyout(buf, sopt->sopt_val, valsize); 1513 else 1514 bcopy(buf, sopt->sopt_val, valsize); 1515 } 1516 return error; 1517 } 1518 1519 int 1520 sogetopt(so, sopt) 1521 struct socket *so; 1522 struct sockopt *sopt; 1523 { 1524 int error, optval; 1525 struct linger l; 1526 struct timeval tv; 1527 #ifdef INET 1528 struct accept_filter_arg *afap; 1529 #endif 1530 #ifdef MAC 1531 struct mac extmac; 1532 #endif 1533 1534 error = 0; 1535 if (sopt->sopt_level != SOL_SOCKET) { 1536 if (so->so_proto && so->so_proto->pr_ctloutput) { 1537 return ((*so->so_proto->pr_ctloutput) 1538 (so, sopt)); 1539 } else 1540 return (ENOPROTOOPT); 1541 } else { 1542 switch (sopt->sopt_name) { 1543 #ifdef INET 1544 case SO_ACCEPTFILTER: 1545 if ((so->so_options & SO_ACCEPTCONN) == 0) 1546 return (EINVAL); 1547 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1548 M_TEMP, M_WAITOK | M_ZERO); 1549 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1550 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1551 if (so->so_accf->so_accept_filter_str != NULL) 1552 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1553 } 1554 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1555 FREE(afap, M_TEMP); 1556 break; 1557 #endif 1558 1559 case SO_LINGER: 1560 l.l_onoff = so->so_options & SO_LINGER; 1561 l.l_linger = so->so_linger; 1562 error = sooptcopyout(sopt, &l, sizeof l); 1563 break; 1564 1565 case SO_USELOOPBACK: 1566 case SO_DONTROUTE: 1567 case SO_DEBUG: 1568 case SO_KEEPALIVE: 1569 case SO_REUSEADDR: 1570 case SO_REUSEPORT: 1571 case SO_BROADCAST: 1572 case SO_OOBINLINE: 1573 case SO_TIMESTAMP: 1574 case SO_BINTIME: 1575 case SO_NOSIGPIPE: 1576 optval = so->so_options & sopt->sopt_name; 1577 integer: 1578 error = sooptcopyout(sopt, &optval, sizeof optval); 1579 break; 1580 1581 case SO_TYPE: 1582 optval = so->so_type; 1583 goto integer; 1584 1585 case SO_ERROR: 1586 optval = so->so_error; 1587 so->so_error = 0; 1588 goto integer; 1589 1590 case SO_SNDBUF: 1591 optval = so->so_snd.sb_hiwat; 1592 goto integer; 1593 1594 case SO_RCVBUF: 1595 optval = so->so_rcv.sb_hiwat; 1596 goto integer; 1597 1598 case SO_SNDLOWAT: 1599 optval = so->so_snd.sb_lowat; 1600 goto integer; 1601 1602 case SO_RCVLOWAT: 1603 optval = so->so_rcv.sb_lowat; 1604 goto integer; 1605 1606 case SO_SNDTIMEO: 1607 case SO_RCVTIMEO: 1608 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1609 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1610 1611 tv.tv_sec = optval / hz; 1612 tv.tv_usec = (optval % hz) * tick; 1613 error = sooptcopyout(sopt, &tv, sizeof tv); 1614 break; 1615 case SO_LABEL: 1616 #ifdef MAC 1617 error = sooptcopyin(sopt, &extmac, sizeof(extmac), 1618 sizeof(extmac)); 1619 if (error) 1620 return (error); 1621 error = mac_getsockopt_label(sopt->sopt_td->td_ucred, 1622 so, &extmac); 1623 if (error) 1624 return (error); 1625 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1626 #else 1627 error = EOPNOTSUPP; 1628 #endif 1629 break; 1630 case SO_PEERLABEL: 1631 #ifdef MAC 1632 error = sooptcopyin(sopt, &extmac, sizeof(extmac), 1633 sizeof(extmac)); 1634 if (error) 1635 return (error); 1636 error = mac_getsockopt_peerlabel( 1637 sopt->sopt_td->td_ucred, so, &extmac); 1638 if (error) 1639 return (error); 1640 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1641 #else 1642 error = EOPNOTSUPP; 1643 #endif 1644 break; 1645 default: 1646 error = ENOPROTOOPT; 1647 break; 1648 } 1649 return (error); 1650 } 1651 } 1652 1653 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1654 int 1655 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1656 { 1657 struct mbuf *m, *m_prev; 1658 int sopt_size = sopt->sopt_valsize; 1659 1660 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1661 if (m == NULL) 1662 return ENOBUFS; 1663 if (sopt_size > MLEN) { 1664 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1665 if ((m->m_flags & M_EXT) == 0) { 1666 m_free(m); 1667 return ENOBUFS; 1668 } 1669 m->m_len = min(MCLBYTES, sopt_size); 1670 } else { 1671 m->m_len = min(MLEN, sopt_size); 1672 } 1673 sopt_size -= m->m_len; 1674 *mp = m; 1675 m_prev = m; 1676 1677 while (sopt_size) { 1678 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1679 if (m == NULL) { 1680 m_freem(*mp); 1681 return ENOBUFS; 1682 } 1683 if (sopt_size > MLEN) { 1684 MCLGET(m, sopt->sopt_td != NULL ? M_TRYWAIT : 1685 M_DONTWAIT); 1686 if ((m->m_flags & M_EXT) == 0) { 1687 m_freem(m); 1688 m_freem(*mp); 1689 return ENOBUFS; 1690 } 1691 m->m_len = min(MCLBYTES, sopt_size); 1692 } else { 1693 m->m_len = min(MLEN, sopt_size); 1694 } 1695 sopt_size -= m->m_len; 1696 m_prev->m_next = m; 1697 m_prev = m; 1698 } 1699 return 0; 1700 } 1701 1702 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1703 int 1704 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1705 { 1706 struct mbuf *m0 = m; 1707 1708 if (sopt->sopt_val == NULL) 1709 return 0; 1710 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1711 if (sopt->sopt_td != NULL) { 1712 int error; 1713 1714 error = copyin(sopt->sopt_val, mtod(m, char *), 1715 m->m_len); 1716 if (error != 0) { 1717 m_freem(m0); 1718 return(error); 1719 } 1720 } else 1721 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1722 sopt->sopt_valsize -= m->m_len; 1723 (caddr_t)sopt->sopt_val += m->m_len; 1724 m = m->m_next; 1725 } 1726 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1727 panic("ip6_sooptmcopyin"); 1728 return 0; 1729 } 1730 1731 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1732 int 1733 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1734 { 1735 struct mbuf *m0 = m; 1736 size_t valsize = 0; 1737 1738 if (sopt->sopt_val == NULL) 1739 return 0; 1740 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1741 if (sopt->sopt_td != NULL) { 1742 int error; 1743 1744 error = copyout(mtod(m, char *), sopt->sopt_val, 1745 m->m_len); 1746 if (error != 0) { 1747 m_freem(m0); 1748 return(error); 1749 } 1750 } else 1751 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1752 sopt->sopt_valsize -= m->m_len; 1753 (caddr_t)sopt->sopt_val += m->m_len; 1754 valsize += m->m_len; 1755 m = m->m_next; 1756 } 1757 if (m != NULL) { 1758 /* enough soopt buffer should be given from user-land */ 1759 m_freem(m0); 1760 return(EINVAL); 1761 } 1762 sopt->sopt_valsize = valsize; 1763 return 0; 1764 } 1765 1766 void 1767 sohasoutofband(so) 1768 struct socket *so; 1769 { 1770 if (so->so_sigio != NULL) 1771 pgsigio(&so->so_sigio, SIGURG, 0); 1772 selwakeuppri(&so->so_rcv.sb_sel, PSOCK); 1773 } 1774 1775 int 1776 sopoll(struct socket *so, int events, struct ucred *active_cred, 1777 struct thread *td) 1778 { 1779 int revents = 0; 1780 int s = splnet(); 1781 1782 if (events & (POLLIN | POLLRDNORM)) 1783 if (soreadable(so)) 1784 revents |= events & (POLLIN | POLLRDNORM); 1785 1786 if (events & POLLINIGNEOF) 1787 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat || 1788 !TAILQ_EMPTY(&so->so_comp) || so->so_error) 1789 revents |= POLLINIGNEOF; 1790 1791 if (events & (POLLOUT | POLLWRNORM)) 1792 if (sowriteable(so)) 1793 revents |= events & (POLLOUT | POLLWRNORM); 1794 1795 if (events & (POLLPRI | POLLRDBAND)) 1796 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1797 revents |= events & (POLLPRI | POLLRDBAND); 1798 1799 if (revents == 0) { 1800 if (events & 1801 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | 1802 POLLRDBAND)) { 1803 selrecord(td, &so->so_rcv.sb_sel); 1804 so->so_rcv.sb_flags |= SB_SEL; 1805 } 1806 1807 if (events & (POLLOUT | POLLWRNORM)) { 1808 selrecord(td, &so->so_snd.sb_sel); 1809 so->so_snd.sb_flags |= SB_SEL; 1810 } 1811 } 1812 1813 splx(s); 1814 return (revents); 1815 } 1816 1817 int 1818 soo_kqfilter(struct file *fp, struct knote *kn) 1819 { 1820 struct socket *so = kn->kn_fp->f_data; 1821 struct sockbuf *sb; 1822 int s; 1823 1824 switch (kn->kn_filter) { 1825 case EVFILT_READ: 1826 if (so->so_options & SO_ACCEPTCONN) 1827 kn->kn_fop = &solisten_filtops; 1828 else 1829 kn->kn_fop = &soread_filtops; 1830 sb = &so->so_rcv; 1831 break; 1832 case EVFILT_WRITE: 1833 kn->kn_fop = &sowrite_filtops; 1834 sb = &so->so_snd; 1835 break; 1836 default: 1837 return (1); 1838 } 1839 1840 s = splnet(); 1841 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1842 sb->sb_flags |= SB_KNOTE; 1843 splx(s); 1844 return (0); 1845 } 1846 1847 static void 1848 filt_sordetach(struct knote *kn) 1849 { 1850 struct socket *so = kn->kn_fp->f_data; 1851 int s = splnet(); 1852 1853 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1854 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1855 so->so_rcv.sb_flags &= ~SB_KNOTE; 1856 splx(s); 1857 } 1858 1859 /*ARGSUSED*/ 1860 static int 1861 filt_soread(struct knote *kn, long hint) 1862 { 1863 struct socket *so = kn->kn_fp->f_data; 1864 int result; 1865 1866 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 1867 if (so->so_state & SS_CANTRCVMORE) { 1868 kn->kn_flags |= EV_EOF; 1869 kn->kn_fflags = so->so_error; 1870 result = 1; 1871 } else if (so->so_error) /* temporary udp error */ 1872 result = 1; 1873 else if (kn->kn_sfflags & NOTE_LOWAT) 1874 result = (kn->kn_data >= kn->kn_sdata); 1875 else 1876 result = (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat); 1877 return (result); 1878 } 1879 1880 static void 1881 filt_sowdetach(struct knote *kn) 1882 { 1883 struct socket *so = kn->kn_fp->f_data; 1884 int s = splnet(); 1885 1886 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1887 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1888 so->so_snd.sb_flags &= ~SB_KNOTE; 1889 splx(s); 1890 } 1891 1892 /*ARGSUSED*/ 1893 static int 1894 filt_sowrite(struct knote *kn, long hint) 1895 { 1896 struct socket *so = kn->kn_fp->f_data; 1897 int result; 1898 1899 kn->kn_data = sbspace(&so->so_snd); 1900 if (so->so_state & SS_CANTSENDMORE) { 1901 kn->kn_flags |= EV_EOF; 1902 kn->kn_fflags = so->so_error; 1903 result = 1; 1904 } else if (so->so_error) /* temporary udp error */ 1905 result = 1; 1906 else if (((so->so_state & SS_ISCONNECTED) == 0) && 1907 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1908 result = 0; 1909 else if (kn->kn_sfflags & NOTE_LOWAT) 1910 result = (kn->kn_data >= kn->kn_sdata); 1911 else 1912 result = (kn->kn_data >= so->so_snd.sb_lowat); 1913 return (result); 1914 } 1915 1916 /*ARGSUSED*/ 1917 static int 1918 filt_solisten(struct knote *kn, long hint) 1919 { 1920 struct socket *so = kn->kn_fp->f_data; 1921 1922 kn->kn_data = so->so_qlen; 1923 return (! TAILQ_EMPTY(&so->so_comp)); 1924 } 1925 1926 int 1927 socheckuid(struct socket *so, uid_t uid) 1928 { 1929 1930 if (so == NULL) 1931 return (EPERM); 1932 if (so->so_cred->cr_uid == uid) 1933 return (0); 1934 return (EPERM); 1935 } 1936