uipc_socket.c revision 111161
1/* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94 34 * $FreeBSD: head/sys/kern/uipc_socket.c 111161 2003-02-20 03:26:11Z cognet $ 35 */ 36 37#include "opt_inet.h" 38#include "opt_mac.h" 39#include "opt_zero.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/fcntl.h> 44#include <sys/lock.h> 45#include <sys/mac.h> 46#include <sys/malloc.h> 47#include <sys/mbuf.h> 48#include <sys/mutex.h> 49#include <sys/domain.h> 50#include <sys/file.h> /* for struct knote */ 51#include <sys/kernel.h> 52#include <sys/event.h> 53#include <sys/poll.h> 54#include <sys/proc.h> 55#include <sys/protosw.h> 56#include <sys/socket.h> 57#include <sys/socketvar.h> 58#include <sys/resourcevar.h> 59#include <sys/signalvar.h> 60#include <sys/sysctl.h> 61#include <sys/uio.h> 62#include <sys/jail.h> 63 64#include <vm/uma.h> 65 66#include <machine/limits.h> 67 68#ifdef INET 69static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 70#endif 71 72static void filt_sordetach(struct knote *kn); 73static int filt_soread(struct knote *kn, long hint); 74static void filt_sowdetach(struct knote *kn); 75static int filt_sowrite(struct knote *kn, long hint); 76static int filt_solisten(struct knote *kn, long hint); 77 78static struct filterops solisten_filtops = 79 { 1, NULL, filt_sordetach, filt_solisten }; 80static struct filterops soread_filtops = 81 { 1, NULL, filt_sordetach, filt_soread }; 82static struct filterops sowrite_filtops = 83 { 1, NULL, filt_sowdetach, filt_sowrite }; 84 85uma_zone_t socket_zone; 86so_gen_t so_gencnt; /* generation count for sockets */ 87 88MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 89MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 90 91SYSCTL_DECL(_kern_ipc); 92 93static int somaxconn = SOMAXCONN; 94SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 95 &somaxconn, 0, "Maximum pending socket connection queue size"); 96static int numopensockets; 97SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD, 98 &numopensockets, 0, "Number of open sockets"); 99#ifdef ZERO_COPY_SOCKETS 100/* These aren't static because they're used in other files. */ 101int so_zero_copy_send = 1; 102int so_zero_copy_receive = 1; 103SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0, 104 "Zero copy controls"); 105SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW, 106 &so_zero_copy_receive, 0, "Enable zero copy receive"); 107SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW, 108 &so_zero_copy_send, 0, "Enable zero copy send"); 109#endif /* ZERO_COPY_SOCKETS */ 110 111 112/* 113 * Socket operation routines. 114 * These routines are called by the routines in 115 * sys_socket.c or from a system process, and 116 * implement the semantics of socket operations by 117 * switching out to the protocol specific routines. 118 */ 119 120/* 121 * Get a socket structure from our zone, and initialize it. 122 * Note that it would probably be better to allocate socket 123 * and PCB at the same time, but I'm not convinced that all 124 * the protocols can be easily modified to do this. 125 * 126 * soalloc() returns a socket with a ref count of 0. 127 */ 128struct socket * 129soalloc(waitok) 130 int waitok; 131{ 132 struct socket *so; 133#ifdef MAC 134 int error; 135#endif 136 int flag; 137 138 if (waitok == 1) 139 flag = M_WAITOK; 140 else 141 flag = M_NOWAIT; 142 flag |= M_ZERO; 143 so = uma_zalloc(socket_zone, flag); 144 if (so) { 145#ifdef MAC 146 error = mac_init_socket(so, flag); 147 if (error != 0) { 148 uma_zfree(socket_zone, so); 149 so = NULL; 150 return so; 151 } 152#endif 153 /* XXX race condition for reentrant kernel */ 154 so->so_gencnt = ++so_gencnt; 155 /* sx_init(&so->so_sxlock, "socket sxlock"); */ 156 TAILQ_INIT(&so->so_aiojobq); 157 ++numopensockets; 158 } 159 return so; 160} 161 162/* 163 * socreate returns a socket with a ref count of 1. The socket should be 164 * closed with soclose(). 165 */ 166int 167socreate(dom, aso, type, proto, cred, td) 168 int dom; 169 struct socket **aso; 170 register int type; 171 int proto; 172 struct ucred *cred; 173 struct thread *td; 174{ 175 register struct protosw *prp; 176 register struct socket *so; 177 register int error; 178 179 if (proto) 180 prp = pffindproto(dom, proto, type); 181 else 182 prp = pffindtype(dom, type); 183 184 if (prp == 0 || prp->pr_usrreqs->pru_attach == 0) 185 return (EPROTONOSUPPORT); 186 187 if (jailed(cred) && jail_socket_unixiproute_only && 188 prp->pr_domain->dom_family != PF_LOCAL && 189 prp->pr_domain->dom_family != PF_INET && 190 prp->pr_domain->dom_family != PF_ROUTE) { 191 return (EPROTONOSUPPORT); 192 } 193 194 if (prp->pr_type != type) 195 return (EPROTOTYPE); 196 so = soalloc(M_NOWAIT); 197 if (so == NULL) 198 return (ENOBUFS); 199 200 TAILQ_INIT(&so->so_incomp); 201 TAILQ_INIT(&so->so_comp); 202 so->so_type = type; 203 so->so_cred = crhold(cred); 204 so->so_proto = prp; 205#ifdef MAC 206 mac_create_socket(cred, so); 207#endif 208 soref(so); 209 error = (*prp->pr_usrreqs->pru_attach)(so, proto, td); 210 if (error) { 211 so->so_state |= SS_NOFDREF; 212 sorele(so); 213 return (error); 214 } 215 *aso = so; 216 return (0); 217} 218 219int 220sobind(so, nam, td) 221 struct socket *so; 222 struct sockaddr *nam; 223 struct thread *td; 224{ 225 int s = splnet(); 226 int error; 227 228 error = (*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td); 229 splx(s); 230 return (error); 231} 232 233void 234sodealloc(struct socket *so) 235{ 236 237 KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count)); 238 so->so_gencnt = ++so_gencnt; 239 if (so->so_rcv.sb_hiwat) 240 (void)chgsbsize(so->so_cred->cr_uidinfo, 241 &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY); 242 if (so->so_snd.sb_hiwat) 243 (void)chgsbsize(so->so_cred->cr_uidinfo, 244 &so->so_snd.sb_hiwat, 0, RLIM_INFINITY); 245#ifdef INET 246 /* remove acccept filter if one is present. */ 247 if (so->so_accf != NULL) 248 do_setopt_accept_filter(so, NULL); 249#endif 250#ifdef MAC 251 mac_destroy_socket(so); 252#endif 253 crfree(so->so_cred); 254 /* sx_destroy(&so->so_sxlock); */ 255 uma_zfree(socket_zone, so); 256 --numopensockets; 257} 258 259int 260solisten(so, backlog, td) 261 register struct socket *so; 262 int backlog; 263 struct thread *td; 264{ 265 int s, error; 266 267 s = splnet(); 268 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING)) { 269 splx(s); 270 return (EINVAL); 271 } 272 error = (*so->so_proto->pr_usrreqs->pru_listen)(so, td); 273 if (error) { 274 splx(s); 275 return (error); 276 } 277 if (TAILQ_EMPTY(&so->so_comp)) 278 so->so_options |= SO_ACCEPTCONN; 279 if (backlog < 0 || backlog > somaxconn) 280 backlog = somaxconn; 281 so->so_qlimit = backlog; 282 splx(s); 283 return (0); 284} 285 286void 287sofree(so) 288 register struct socket *so; 289{ 290 struct socket *head = so->so_head; 291 292 KASSERT(so->so_count == 0, ("socket %p so_count not 0", so)); 293 294 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 295 return; 296 if (head != NULL) { 297 if (so->so_state & SS_INCOMP) { 298 TAILQ_REMOVE(&head->so_incomp, so, so_list); 299 head->so_incqlen--; 300 } else if (so->so_state & SS_COMP) { 301 /* 302 * We must not decommission a socket that's 303 * on the accept(2) queue. If we do, then 304 * accept(2) may hang after select(2) indicated 305 * that the listening socket was ready. 306 */ 307 return; 308 } else { 309 panic("sofree: not queued"); 310 } 311 so->so_state &= ~SS_INCOMP; 312 so->so_head = NULL; 313 } 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 */ 328int 329soclose(so) 330 register 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 == 0) 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 } 374drop: 375 if (so->so_pcb) { 376 int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so); 377 if (error == 0) 378 error = error2; 379 } 380discard: 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 */ 392int 393soabort(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 406int 407soaccept(so, nam) 408 register 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 422int 423soconnect(so, nam, td) 424 register 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 450int 451soconnect2(so1, so2) 452 register 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 463int 464sodisconnect(so) 465 register 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); 479bad: 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 504struct so_zerocopy_stats{ 505 int size_ok; 506 int align_ok; 507 int found_ifp; 508}; 509struct 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 518int 519sosend(so, addr, uio, top, control, flags, td) 520 register 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 register struct mbuf *m; 530 register 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) 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) 560 td->td_proc->p_stats->p_ru.ru_msgsnd++; 561 if (control) 562 clen = control->m_len; 563#define snderr(errno) { error = (errno); splx(s); goto release; } 564 565restart: 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 == 0) 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 */ 671nopages: 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, caddr_t), (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 = 0; 731 top = 0; 732 mp = ⊤ 733 if (error) 734 goto release; 735 } while (resid && space > 0); 736 } while (resid); 737 738release: 739 sbunlock(&so->so_snd); 740out: 741 if (top) 742 m_freem(top); 743 if (control) 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 */ 764int 765soreceive(so, psa, uio, mp0, controlp, flagsp) 766 register 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 register 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) 782 *psa = 0; 783 if (controlp) 784 *controlp = 0; 785 if (flagsp) 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, caddr_t), 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, caddr_t), 819 (int) min(uio->uio_resid, m->m_len), uio); 820 m = m_free(m); 821 } while (uio->uio_resid && error == 0 && m); 822bad: 823 if (m) 824 m_freem(m); 825 return (error); 826 } 827 if (mp) 828 *mp = (struct mbuf *)0; 829 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 830 (*pr->pr_usrreqs->pru_rcvd)(so, 0); 831 832restart: 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 == 0 || (((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 == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 855 KASSERT(m != 0 || !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) 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; 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 sbunlock(&so->so_rcv); 889 error = sbwait(&so->so_rcv); 890 splx(s); 891 if (error) 892 return (error); 893 goto restart; 894 } 895dontblock: 896 if (uio->uio_td) 897 uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++; 898 nextrecord = m->m_nextpkt; 899 if (pr->pr_flags & PR_ADDR) { 900 KASSERT(m->m_type == MT_SONAME, 901 ("m->m_type == %d", m->m_type)); 902 orig_resid = 0; 903 if (psa) 904 *psa = dup_sockaddr(mtod(m, struct sockaddr *), 905 mp0 == 0); 906 if (flags & MSG_PEEK) { 907 m = m->m_next; 908 } else { 909 sbfree(&so->so_rcv, m); 910 so->so_rcv.sb_mb = m_free(m); 911 m = so->so_rcv.sb_mb; 912 } 913 } 914 while (m && m->m_type == MT_CONTROL && error == 0) { 915 if (flags & MSG_PEEK) { 916 if (controlp) 917 *controlp = m_copy(m, 0, m->m_len); 918 m = m->m_next; 919 } else { 920 sbfree(&so->so_rcv, m); 921 so->so_rcv.sb_mb = m->m_next; 922 m->m_next = NULL; 923 if (pr->pr_domain->dom_externalize) 924 error = 925 (*pr->pr_domain->dom_externalize)(m, controlp); 926 else if (controlp) 927 *controlp = m; 928 else 929 m_freem(m); 930 m = so->so_rcv.sb_mb; 931 } 932 if (controlp) { 933 orig_resid = 0; 934 do 935 controlp = &(*controlp)->m_next; 936 while (*controlp != NULL); 937 } 938 } 939 if (m) { 940 if ((flags & MSG_PEEK) == 0) 941 m->m_nextpkt = nextrecord; 942 type = m->m_type; 943 if (type == MT_OOBDATA) 944 flags |= MSG_OOB; 945 } 946 moff = 0; 947 offset = 0; 948 while (m && uio->uio_resid > 0 && error == 0) { 949 if (m->m_type == MT_OOBDATA) { 950 if (type != MT_OOBDATA) 951 break; 952 } else if (type == MT_OOBDATA) 953 break; 954 else 955 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 956 ("m->m_type == %d", m->m_type)); 957 so->so_state &= ~SS_RCVATMARK; 958 len = uio->uio_resid; 959 if (so->so_oobmark && len > so->so_oobmark - offset) 960 len = so->so_oobmark - offset; 961 if (len > m->m_len - moff) 962 len = m->m_len - moff; 963 /* 964 * If mp is set, just pass back the mbufs. 965 * Otherwise copy them out via the uio, then free. 966 * Sockbuf must be consistent here (points to current mbuf, 967 * it points to next record) when we drop priority; 968 * we must note any additions to the sockbuf when we 969 * block interrupts again. 970 */ 971 if (mp == 0) { 972 splx(s); 973#ifdef ZERO_COPY_SOCKETS 974 if (so_zero_copy_receive) { 975 vm_page_t pg; 976 int disposable; 977 978 if ((m->m_flags & M_EXT) 979 && (m->m_ext.ext_type == EXT_DISPOSABLE)) 980 disposable = 1; 981 else 982 disposable = 0; 983 984 pg = PHYS_TO_VM_PAGE(vtophys(mtod(m, caddr_t) + 985 moff)); 986 987 if (uio->uio_offset == -1) 988 uio->uio_offset =IDX_TO_OFF(pg->pindex); 989 990 error = uiomoveco(mtod(m, caddr_t) + moff, 991 (int)len, uio,pg->object, 992 disposable); 993 } else 994#endif /* ZERO_COPY_SOCKETS */ 995 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 996 s = splnet(); 997 if (error) 998 goto release; 999 } else 1000 uio->uio_resid -= len; 1001 if (len == m->m_len - moff) { 1002 if (m->m_flags & M_EOR) 1003 flags |= MSG_EOR; 1004 if (flags & MSG_PEEK) { 1005 m = m->m_next; 1006 moff = 0; 1007 } else { 1008 nextrecord = m->m_nextpkt; 1009 sbfree(&so->so_rcv, m); 1010 if (mp) { 1011 *mp = m; 1012 mp = &m->m_next; 1013 so->so_rcv.sb_mb = m = m->m_next; 1014 *mp = (struct mbuf *)0; 1015 } else { 1016 so->so_rcv.sb_mb = m_free(m); 1017 m = so->so_rcv.sb_mb; 1018 } 1019 if (m) 1020 m->m_nextpkt = nextrecord; 1021 } 1022 } else { 1023 if (flags & MSG_PEEK) 1024 moff += len; 1025 else { 1026 if (mp) 1027 *mp = m_copym(m, 0, len, M_TRYWAIT); 1028 m->m_data += len; 1029 m->m_len -= len; 1030 so->so_rcv.sb_cc -= len; 1031 } 1032 } 1033 if (so->so_oobmark) { 1034 if ((flags & MSG_PEEK) == 0) { 1035 so->so_oobmark -= len; 1036 if (so->so_oobmark == 0) { 1037 so->so_state |= SS_RCVATMARK; 1038 break; 1039 } 1040 } else { 1041 offset += len; 1042 if (offset == so->so_oobmark) 1043 break; 1044 } 1045 } 1046 if (flags & MSG_EOR) 1047 break; 1048 /* 1049 * If the MSG_WAITALL flag is set (for non-atomic socket), 1050 * we must not quit until "uio->uio_resid == 0" or an error 1051 * termination. If a signal/timeout occurs, return 1052 * with a short count but without error. 1053 * Keep sockbuf locked against other readers. 1054 */ 1055 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 1056 !sosendallatonce(so) && !nextrecord) { 1057 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1058 break; 1059 /* 1060 * Notify the protocol that some data has been 1061 * drained before blocking. 1062 */ 1063 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1064 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1065 error = sbwait(&so->so_rcv); 1066 if (error) { 1067 sbunlock(&so->so_rcv); 1068 splx(s); 1069 return (0); 1070 } 1071 m = so->so_rcv.sb_mb; 1072 if (m) 1073 nextrecord = m->m_nextpkt; 1074 } 1075 } 1076 1077 if (m && pr->pr_flags & PR_ATOMIC) { 1078 flags |= MSG_TRUNC; 1079 if ((flags & MSG_PEEK) == 0) 1080 (void) sbdroprecord(&so->so_rcv); 1081 } 1082 if ((flags & MSG_PEEK) == 0) { 1083 if (m == 0) 1084 so->so_rcv.sb_mb = nextrecord; 1085 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1086 (*pr->pr_usrreqs->pru_rcvd)(so, flags); 1087 } 1088 if (orig_resid == uio->uio_resid && orig_resid && 1089 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1090 sbunlock(&so->so_rcv); 1091 splx(s); 1092 goto restart; 1093 } 1094 1095 if (flagsp) 1096 *flagsp |= flags; 1097release: 1098 sbunlock(&so->so_rcv); 1099 splx(s); 1100 return (error); 1101} 1102 1103int 1104soshutdown(so, how) 1105 register struct socket *so; 1106 register int how; 1107{ 1108 register struct protosw *pr = so->so_proto; 1109 1110 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1111 return (EINVAL); 1112 1113 if (how != SHUT_WR) 1114 sorflush(so); 1115 if (how != SHUT_RD) 1116 return ((*pr->pr_usrreqs->pru_shutdown)(so)); 1117 return (0); 1118} 1119 1120void 1121sorflush(so) 1122 register struct socket *so; 1123{ 1124 register struct sockbuf *sb = &so->so_rcv; 1125 register struct protosw *pr = so->so_proto; 1126 register int s; 1127 struct sockbuf asb; 1128 1129 sb->sb_flags |= SB_NOINTR; 1130 (void) sblock(sb, M_WAITOK); 1131 s = splimp(); 1132 socantrcvmore(so); 1133 sbunlock(sb); 1134 asb = *sb; 1135 bzero(sb, sizeof (*sb)); 1136 splx(s); 1137 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 1138 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1139 sbrelease(&asb, so); 1140} 1141 1142#ifdef INET 1143static int 1144do_setopt_accept_filter(so, sopt) 1145 struct socket *so; 1146 struct sockopt *sopt; 1147{ 1148 struct accept_filter_arg *afap = NULL; 1149 struct accept_filter *afp; 1150 struct so_accf *af = so->so_accf; 1151 int error = 0; 1152 1153 /* do not set/remove accept filters on non listen sockets */ 1154 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1155 error = EINVAL; 1156 goto out; 1157 } 1158 1159 /* removing the filter */ 1160 if (sopt == NULL) { 1161 if (af != NULL) { 1162 if (af->so_accept_filter != NULL && 1163 af->so_accept_filter->accf_destroy != NULL) { 1164 af->so_accept_filter->accf_destroy(so); 1165 } 1166 if (af->so_accept_filter_str != NULL) { 1167 FREE(af->so_accept_filter_str, M_ACCF); 1168 } 1169 FREE(af, M_ACCF); 1170 so->so_accf = NULL; 1171 } 1172 so->so_options &= ~SO_ACCEPTFILTER; 1173 return (0); 1174 } 1175 /* adding a filter */ 1176 /* must remove previous filter first */ 1177 if (af != NULL) { 1178 error = EINVAL; 1179 goto out; 1180 } 1181 /* don't put large objects on the kernel stack */ 1182 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), M_TEMP, M_WAITOK); 1183 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1184 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1185 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1186 if (error) 1187 goto out; 1188 afp = accept_filt_get(afap->af_name); 1189 if (afp == NULL) { 1190 error = ENOENT; 1191 goto out; 1192 } 1193 MALLOC(af, struct so_accf *, sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1194 if (afp->accf_create != NULL) { 1195 if (afap->af_name[0] != '\0') { 1196 int len = strlen(afap->af_name) + 1; 1197 1198 MALLOC(af->so_accept_filter_str, char *, len, M_ACCF, M_WAITOK); 1199 strcpy(af->so_accept_filter_str, afap->af_name); 1200 } 1201 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1202 if (af->so_accept_filter_arg == NULL) { 1203 FREE(af->so_accept_filter_str, M_ACCF); 1204 FREE(af, M_ACCF); 1205 so->so_accf = NULL; 1206 error = EINVAL; 1207 goto out; 1208 } 1209 } 1210 af->so_accept_filter = afp; 1211 so->so_accf = af; 1212 so->so_options |= SO_ACCEPTFILTER; 1213out: 1214 if (afap != NULL) 1215 FREE(afap, M_TEMP); 1216 return (error); 1217} 1218#endif /* INET */ 1219 1220/* 1221 * Perhaps this routine, and sooptcopyout(), below, ought to come in 1222 * an additional variant to handle the case where the option value needs 1223 * to be some kind of integer, but not a specific size. 1224 * In addition to their use here, these functions are also called by the 1225 * protocol-level pr_ctloutput() routines. 1226 */ 1227int 1228sooptcopyin(sopt, buf, len, minlen) 1229 struct sockopt *sopt; 1230 void *buf; 1231 size_t len; 1232 size_t minlen; 1233{ 1234 size_t valsize; 1235 1236 /* 1237 * If the user gives us more than we wanted, we ignore it, 1238 * but if we don't get the minimum length the caller 1239 * wants, we return EINVAL. On success, sopt->sopt_valsize 1240 * is set to however much we actually retrieved. 1241 */ 1242 if ((valsize = sopt->sopt_valsize) < minlen) 1243 return EINVAL; 1244 if (valsize > len) 1245 sopt->sopt_valsize = valsize = len; 1246 1247 if (sopt->sopt_td != 0) 1248 return (copyin(sopt->sopt_val, buf, valsize)); 1249 1250 bcopy(sopt->sopt_val, buf, valsize); 1251 return 0; 1252} 1253 1254int 1255sosetopt(so, sopt) 1256 struct socket *so; 1257 struct sockopt *sopt; 1258{ 1259 int error, optval; 1260 struct linger l; 1261 struct timeval tv; 1262 u_long val; 1263#ifdef MAC 1264 struct mac extmac; 1265#endif 1266 1267 error = 0; 1268 if (sopt->sopt_level != SOL_SOCKET) { 1269 if (so->so_proto && so->so_proto->pr_ctloutput) 1270 return ((*so->so_proto->pr_ctloutput) 1271 (so, sopt)); 1272 error = ENOPROTOOPT; 1273 } else { 1274 switch (sopt->sopt_name) { 1275#ifdef INET 1276 case SO_ACCEPTFILTER: 1277 error = do_setopt_accept_filter(so, sopt); 1278 if (error) 1279 goto bad; 1280 break; 1281#endif 1282 case SO_LINGER: 1283 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 1284 if (error) 1285 goto bad; 1286 1287 so->so_linger = l.l_linger; 1288 if (l.l_onoff) 1289 so->so_options |= SO_LINGER; 1290 else 1291 so->so_options &= ~SO_LINGER; 1292 break; 1293 1294 case SO_DEBUG: 1295 case SO_KEEPALIVE: 1296 case SO_DONTROUTE: 1297 case SO_USELOOPBACK: 1298 case SO_BROADCAST: 1299 case SO_REUSEADDR: 1300 case SO_REUSEPORT: 1301 case SO_OOBINLINE: 1302 case SO_TIMESTAMP: 1303 case SO_NOSIGPIPE: 1304 error = sooptcopyin(sopt, &optval, sizeof optval, 1305 sizeof optval); 1306 if (error) 1307 goto bad; 1308 if (optval) 1309 so->so_options |= sopt->sopt_name; 1310 else 1311 so->so_options &= ~sopt->sopt_name; 1312 break; 1313 1314 case SO_SNDBUF: 1315 case SO_RCVBUF: 1316 case SO_SNDLOWAT: 1317 case SO_RCVLOWAT: 1318 error = sooptcopyin(sopt, &optval, sizeof optval, 1319 sizeof optval); 1320 if (error) 1321 goto bad; 1322 1323 /* 1324 * Values < 1 make no sense for any of these 1325 * options, so disallow them. 1326 */ 1327 if (optval < 1) { 1328 error = EINVAL; 1329 goto bad; 1330 } 1331 1332 switch (sopt->sopt_name) { 1333 case SO_SNDBUF: 1334 case SO_RCVBUF: 1335 if (sbreserve(sopt->sopt_name == SO_SNDBUF ? 1336 &so->so_snd : &so->so_rcv, (u_long)optval, 1337 so, curthread) == 0) { 1338 error = ENOBUFS; 1339 goto bad; 1340 } 1341 break; 1342 1343 /* 1344 * Make sure the low-water is never greater than 1345 * the high-water. 1346 */ 1347 case SO_SNDLOWAT: 1348 so->so_snd.sb_lowat = 1349 (optval > so->so_snd.sb_hiwat) ? 1350 so->so_snd.sb_hiwat : optval; 1351 break; 1352 case SO_RCVLOWAT: 1353 so->so_rcv.sb_lowat = 1354 (optval > so->so_rcv.sb_hiwat) ? 1355 so->so_rcv.sb_hiwat : optval; 1356 break; 1357 } 1358 break; 1359 1360 case SO_SNDTIMEO: 1361 case SO_RCVTIMEO: 1362 error = sooptcopyin(sopt, &tv, sizeof tv, 1363 sizeof tv); 1364 if (error) 1365 goto bad; 1366 1367 /* assert(hz > 0); */ 1368 if (tv.tv_sec < 0 || tv.tv_sec > SHRT_MAX / hz || 1369 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1370 error = EDOM; 1371 goto bad; 1372 } 1373 /* assert(tick > 0); */ 1374 /* assert(ULONG_MAX - SHRT_MAX >= 1000000); */ 1375 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick; 1376 if (val > SHRT_MAX) { 1377 error = EDOM; 1378 goto bad; 1379 } 1380 if (val == 0 && tv.tv_usec != 0) 1381 val = 1; 1382 1383 switch (sopt->sopt_name) { 1384 case SO_SNDTIMEO: 1385 so->so_snd.sb_timeo = val; 1386 break; 1387 case SO_RCVTIMEO: 1388 so->so_rcv.sb_timeo = val; 1389 break; 1390 } 1391 break; 1392 case SO_LABEL: 1393#ifdef MAC 1394 error = sooptcopyin(sopt, &extmac, sizeof extmac, 1395 sizeof extmac); 1396 if (error) 1397 goto bad; 1398 1399 error = mac_setsockopt_label_set( 1400 sopt->sopt_td->td_ucred, so, &extmac); 1401 1402#else 1403 error = EOPNOTSUPP; 1404#endif 1405 break; 1406 default: 1407 error = ENOPROTOOPT; 1408 break; 1409 } 1410 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 1411 (void) ((*so->so_proto->pr_ctloutput) 1412 (so, sopt)); 1413 } 1414 } 1415bad: 1416 return (error); 1417} 1418 1419/* Helper routine for getsockopt */ 1420int 1421sooptcopyout(sopt, buf, len) 1422 struct sockopt *sopt; 1423 void *buf; 1424 size_t len; 1425{ 1426 int error; 1427 size_t valsize; 1428 1429 error = 0; 1430 1431 /* 1432 * Documented get behavior is that we always return a value, 1433 * possibly truncated to fit in the user's buffer. 1434 * Traditional behavior is that we always tell the user 1435 * precisely how much we copied, rather than something useful 1436 * like the total amount we had available for her. 1437 * Note that this interface is not idempotent; the entire answer must 1438 * generated ahead of time. 1439 */ 1440 valsize = min(len, sopt->sopt_valsize); 1441 sopt->sopt_valsize = valsize; 1442 if (sopt->sopt_val != 0) { 1443 if (sopt->sopt_td != 0) 1444 error = copyout(buf, sopt->sopt_val, valsize); 1445 else 1446 bcopy(buf, sopt->sopt_val, valsize); 1447 } 1448 return error; 1449} 1450 1451int 1452sogetopt(so, sopt) 1453 struct socket *so; 1454 struct sockopt *sopt; 1455{ 1456 int error, optval; 1457 struct linger l; 1458 struct timeval tv; 1459#ifdef INET 1460 struct accept_filter_arg *afap; 1461#endif 1462#ifdef MAC 1463 struct mac extmac; 1464#endif 1465 1466 error = 0; 1467 if (sopt->sopt_level != SOL_SOCKET) { 1468 if (so->so_proto && so->so_proto->pr_ctloutput) { 1469 return ((*so->so_proto->pr_ctloutput) 1470 (so, sopt)); 1471 } else 1472 return (ENOPROTOOPT); 1473 } else { 1474 switch (sopt->sopt_name) { 1475#ifdef INET 1476 case SO_ACCEPTFILTER: 1477 if ((so->so_options & SO_ACCEPTCONN) == 0) 1478 return (EINVAL); 1479 MALLOC(afap, struct accept_filter_arg *, sizeof(*afap), 1480 M_TEMP, M_WAITOK | M_ZERO); 1481 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 1482 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 1483 if (so->so_accf->so_accept_filter_str != NULL) 1484 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 1485 } 1486 error = sooptcopyout(sopt, afap, sizeof(*afap)); 1487 FREE(afap, M_TEMP); 1488 break; 1489#endif 1490 1491 case SO_LINGER: 1492 l.l_onoff = so->so_options & SO_LINGER; 1493 l.l_linger = so->so_linger; 1494 error = sooptcopyout(sopt, &l, sizeof l); 1495 break; 1496 1497 case SO_USELOOPBACK: 1498 case SO_DONTROUTE: 1499 case SO_DEBUG: 1500 case SO_KEEPALIVE: 1501 case SO_REUSEADDR: 1502 case SO_REUSEPORT: 1503 case SO_BROADCAST: 1504 case SO_OOBINLINE: 1505 case SO_TIMESTAMP: 1506 case SO_NOSIGPIPE: 1507 optval = so->so_options & sopt->sopt_name; 1508integer: 1509 error = sooptcopyout(sopt, &optval, sizeof optval); 1510 break; 1511 1512 case SO_TYPE: 1513 optval = so->so_type; 1514 goto integer; 1515 1516 case SO_ERROR: 1517 optval = so->so_error; 1518 so->so_error = 0; 1519 goto integer; 1520 1521 case SO_SNDBUF: 1522 optval = so->so_snd.sb_hiwat; 1523 goto integer; 1524 1525 case SO_RCVBUF: 1526 optval = so->so_rcv.sb_hiwat; 1527 goto integer; 1528 1529 case SO_SNDLOWAT: 1530 optval = so->so_snd.sb_lowat; 1531 goto integer; 1532 1533 case SO_RCVLOWAT: 1534 optval = so->so_rcv.sb_lowat; 1535 goto integer; 1536 1537 case SO_SNDTIMEO: 1538 case SO_RCVTIMEO: 1539 optval = (sopt->sopt_name == SO_SNDTIMEO ? 1540 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1541 1542 tv.tv_sec = optval / hz; 1543 tv.tv_usec = (optval % hz) * tick; 1544 error = sooptcopyout(sopt, &tv, sizeof tv); 1545 break; 1546 case SO_LABEL: 1547#ifdef MAC 1548 error = mac_getsockopt_label_get( 1549 sopt->sopt_td->td_ucred, so, &extmac); 1550 if (error) 1551 return (error); 1552 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1553#else 1554 error = EOPNOTSUPP; 1555#endif 1556 break; 1557 case SO_PEERLABEL: 1558#ifdef MAC 1559 error = mac_getsockopt_peerlabel_get( 1560 sopt->sopt_td->td_ucred, so, &extmac); 1561 if (error) 1562 return (error); 1563 error = sooptcopyout(sopt, &extmac, sizeof extmac); 1564#else 1565 error = EOPNOTSUPP; 1566#endif 1567 break; 1568 default: 1569 error = ENOPROTOOPT; 1570 break; 1571 } 1572 return (error); 1573 } 1574} 1575 1576/* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 1577int 1578soopt_getm(struct sockopt *sopt, struct mbuf **mp) 1579{ 1580 struct mbuf *m, *m_prev; 1581 int sopt_size = sopt->sopt_valsize; 1582 1583 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1584 if (m == 0) 1585 return ENOBUFS; 1586 if (sopt_size > MLEN) { 1587 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1588 if ((m->m_flags & M_EXT) == 0) { 1589 m_free(m); 1590 return ENOBUFS; 1591 } 1592 m->m_len = min(MCLBYTES, sopt_size); 1593 } else { 1594 m->m_len = min(MLEN, sopt_size); 1595 } 1596 sopt_size -= m->m_len; 1597 *mp = m; 1598 m_prev = m; 1599 1600 while (sopt_size) { 1601 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA); 1602 if (m == 0) { 1603 m_freem(*mp); 1604 return ENOBUFS; 1605 } 1606 if (sopt_size > MLEN) { 1607 MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT); 1608 if ((m->m_flags & M_EXT) == 0) { 1609 m_freem(*mp); 1610 return ENOBUFS; 1611 } 1612 m->m_len = min(MCLBYTES, sopt_size); 1613 } else { 1614 m->m_len = min(MLEN, sopt_size); 1615 } 1616 sopt_size -= m->m_len; 1617 m_prev->m_next = m; 1618 m_prev = m; 1619 } 1620 return 0; 1621} 1622 1623/* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 1624int 1625soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 1626{ 1627 struct mbuf *m0 = m; 1628 1629 if (sopt->sopt_val == NULL) 1630 return 0; 1631 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1632 if (sopt->sopt_td != NULL) { 1633 int error; 1634 1635 error = copyin(sopt->sopt_val, mtod(m, char *), 1636 m->m_len); 1637 if (error != 0) { 1638 m_freem(m0); 1639 return(error); 1640 } 1641 } else 1642 bcopy(sopt->sopt_val, mtod(m, char *), m->m_len); 1643 sopt->sopt_valsize -= m->m_len; 1644 (caddr_t)sopt->sopt_val += m->m_len; 1645 m = m->m_next; 1646 } 1647 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 1648 panic("ip6_sooptmcopyin"); 1649 return 0; 1650} 1651 1652/* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 1653int 1654soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 1655{ 1656 struct mbuf *m0 = m; 1657 size_t valsize = 0; 1658 1659 if (sopt->sopt_val == NULL) 1660 return 0; 1661 while (m != NULL && sopt->sopt_valsize >= m->m_len) { 1662 if (sopt->sopt_td != NULL) { 1663 int error; 1664 1665 error = copyout(mtod(m, char *), sopt->sopt_val, 1666 m->m_len); 1667 if (error != 0) { 1668 m_freem(m0); 1669 return(error); 1670 } 1671 } else 1672 bcopy(mtod(m, char *), sopt->sopt_val, m->m_len); 1673 sopt->sopt_valsize -= m->m_len; 1674 (caddr_t)sopt->sopt_val += m->m_len; 1675 valsize += m->m_len; 1676 m = m->m_next; 1677 } 1678 if (m != NULL) { 1679 /* enough soopt buffer should be given from user-land */ 1680 m_freem(m0); 1681 return(EINVAL); 1682 } 1683 sopt->sopt_valsize = valsize; 1684 return 0; 1685} 1686 1687void 1688sohasoutofband(so) 1689 register struct socket *so; 1690{ 1691 if (so->so_sigio != NULL) 1692 pgsigio(&so->so_sigio, SIGURG, 0); 1693 selwakeup(&so->so_rcv.sb_sel); 1694} 1695 1696int 1697sopoll(struct socket *so, int events, struct ucred *active_cred, 1698 struct thread *td) 1699{ 1700 int revents = 0; 1701 int s = splnet(); 1702 1703 if (events & (POLLIN | POLLRDNORM)) 1704 if (soreadable(so)) 1705 revents |= events & (POLLIN | POLLRDNORM); 1706 1707 if (events & POLLINIGNEOF) 1708 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat || 1709 !TAILQ_EMPTY(&so->so_comp) || so->so_error) 1710 revents |= POLLINIGNEOF; 1711 1712 if (events & (POLLOUT | POLLWRNORM)) 1713 if (sowriteable(so)) 1714 revents |= events & (POLLOUT | POLLWRNORM); 1715 1716 if (events & (POLLPRI | POLLRDBAND)) 1717 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 1718 revents |= events & (POLLPRI | POLLRDBAND); 1719 1720 if (revents == 0) { 1721 if (events & 1722 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | 1723 POLLRDBAND)) { 1724 selrecord(td, &so->so_rcv.sb_sel); 1725 so->so_rcv.sb_flags |= SB_SEL; 1726 } 1727 1728 if (events & (POLLOUT | POLLWRNORM)) { 1729 selrecord(td, &so->so_snd.sb_sel); 1730 so->so_snd.sb_flags |= SB_SEL; 1731 } 1732 } 1733 1734 splx(s); 1735 return (revents); 1736} 1737 1738int 1739soo_kqfilter(struct file *fp, struct knote *kn) 1740{ 1741 struct socket *so = kn->kn_fp->f_data; 1742 struct sockbuf *sb; 1743 int s; 1744 1745 switch (kn->kn_filter) { 1746 case EVFILT_READ: 1747 if (so->so_options & SO_ACCEPTCONN) 1748 kn->kn_fop = &solisten_filtops; 1749 else 1750 kn->kn_fop = &soread_filtops; 1751 sb = &so->so_rcv; 1752 break; 1753 case EVFILT_WRITE: 1754 kn->kn_fop = &sowrite_filtops; 1755 sb = &so->so_snd; 1756 break; 1757 default: 1758 return (1); 1759 } 1760 1761 s = splnet(); 1762 SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); 1763 sb->sb_flags |= SB_KNOTE; 1764 splx(s); 1765 return (0); 1766} 1767 1768static void 1769filt_sordetach(struct knote *kn) 1770{ 1771 struct socket *so = kn->kn_fp->f_data; 1772 int s = splnet(); 1773 1774 SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); 1775 if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) 1776 so->so_rcv.sb_flags &= ~SB_KNOTE; 1777 splx(s); 1778} 1779 1780/*ARGSUSED*/ 1781static int 1782filt_soread(struct knote *kn, long hint) 1783{ 1784 struct socket *so = kn->kn_fp->f_data; 1785 1786 kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl; 1787 if (so->so_state & SS_CANTRCVMORE) { 1788 kn->kn_flags |= EV_EOF; 1789 kn->kn_fflags = so->so_error; 1790 return (1); 1791 } 1792 if (so->so_error) /* temporary udp error */ 1793 return (1); 1794 if (kn->kn_sfflags & NOTE_LOWAT) 1795 return (kn->kn_data >= kn->kn_sdata); 1796 return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat); 1797} 1798 1799static void 1800filt_sowdetach(struct knote *kn) 1801{ 1802 struct socket *so = kn->kn_fp->f_data; 1803 int s = splnet(); 1804 1805 SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); 1806 if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) 1807 so->so_snd.sb_flags &= ~SB_KNOTE; 1808 splx(s); 1809} 1810 1811/*ARGSUSED*/ 1812static int 1813filt_sowrite(struct knote *kn, long hint) 1814{ 1815 struct socket *so = kn->kn_fp->f_data; 1816 1817 kn->kn_data = sbspace(&so->so_snd); 1818 if (so->so_state & SS_CANTSENDMORE) { 1819 kn->kn_flags |= EV_EOF; 1820 kn->kn_fflags = so->so_error; 1821 return (1); 1822 } 1823 if (so->so_error) /* temporary udp error */ 1824 return (1); 1825 if (((so->so_state & SS_ISCONNECTED) == 0) && 1826 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1827 return (0); 1828 if (kn->kn_sfflags & NOTE_LOWAT) 1829 return (kn->kn_data >= kn->kn_sdata); 1830 return (kn->kn_data >= so->so_snd.sb_lowat); 1831} 1832 1833/*ARGSUSED*/ 1834static int 1835filt_solisten(struct knote *kn, long hint) 1836{ 1837 struct socket *so = kn->kn_fp->f_data; 1838 1839 kn->kn_data = so->so_qlen; 1840 return (! TAILQ_EMPTY(&so->so_comp)); 1841} 1842 1843int 1844socheckuid(struct socket *so, uid_t uid) 1845{ 1846 1847 if (so == NULL) 1848 return (EPERM); 1849 if (so->so_cred->cr_uid == uid) 1850 return (0); 1851 return (EPERM); 1852} 1853