1 /* 2 * Copyright (c) 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94 63 * $FreeBSD: src/sys/kern/uipc_socket.c,v 1.68.2.24 2003/11/11 17:18:18 silby Exp $ 64 */ 65 66 #include "opt_inet.h" 67 #include "opt_sctp.h" 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/fcntl.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/domain.h> 75 #include <sys/file.h> /* for struct knote */ 76 #include <sys/kernel.h> 77 #include <sys/event.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/socketops.h> 83 #include <sys/resourcevar.h> 84 #include <sys/signalvar.h> 85 #include <sys/sysctl.h> 86 #include <sys/uio.h> 87 #include <sys/jail.h> 88 #include <vm/vm_zone.h> 89 #include <vm/pmap.h> 90 #include <net/netmsg2.h> 91 #include <net/netisr2.h> 92 93 #include <sys/thread2.h> 94 #include <sys/socketvar2.h> 95 #include <sys/spinlock2.h> 96 97 #include <machine/limits.h> 98 99 #ifdef INET 100 extern int tcp_sosend_agglim; 101 extern int tcp_sosend_async; 102 extern int udp_sosend_async; 103 extern int udp_sosend_prepend; 104 105 static int do_setopt_accept_filter(struct socket *so, struct sockopt *sopt); 106 #endif /* INET */ 107 108 static void filt_sordetach(struct knote *kn); 109 static int filt_soread(struct knote *kn, long hint); 110 static void filt_sowdetach(struct knote *kn); 111 static int filt_sowrite(struct knote *kn, long hint); 112 static int filt_solisten(struct knote *kn, long hint); 113 114 static void sodiscard(struct socket *so); 115 static int soclose_sync(struct socket *so, int fflag); 116 static void soclose_fast(struct socket *so); 117 118 static struct filterops solisten_filtops = 119 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_solisten }; 120 static struct filterops soread_filtops = 121 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_soread }; 122 static struct filterops sowrite_filtops = 123 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sowdetach, filt_sowrite }; 124 static struct filterops soexcept_filtops = 125 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_sordetach, filt_soread }; 126 127 MALLOC_DEFINE(M_SOCKET, "socket", "socket struct"); 128 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 129 MALLOC_DEFINE(M_PCB, "pcb", "protocol control block"); 130 131 132 static int somaxconn = SOMAXCONN; 133 SYSCTL_INT(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLFLAG_RW, 134 &somaxconn, 0, "Maximum pending socket connection queue size"); 135 136 static int use_soclose_fast = 1; 137 SYSCTL_INT(_kern_ipc, OID_AUTO, soclose_fast, CTLFLAG_RW, 138 &use_soclose_fast, 0, "Fast socket close"); 139 140 int use_soaccept_pred_fast = 1; 141 SYSCTL_INT(_kern_ipc, OID_AUTO, soaccept_pred_fast, CTLFLAG_RW, 142 &use_soaccept_pred_fast, 0, "Fast socket accept predication"); 143 144 int use_sendfile_async = 1; 145 SYSCTL_INT(_kern_ipc, OID_AUTO, sendfile_async, CTLFLAG_RW, 146 &use_sendfile_async, 0, "sendfile uses asynchronized pru_send"); 147 148 int use_soconnect_async = 1; 149 SYSCTL_INT(_kern_ipc, OID_AUTO, soconnect_async, CTLFLAG_RW, 150 &use_soconnect_async, 0, "soconnect uses asynchronized pru_connect"); 151 152 /* 153 * Socket operation routines. 154 * These routines are called by the routines in 155 * sys_socket.c or from a system process, and 156 * implement the semantics of socket operations by 157 * switching out to the protocol specific routines. 158 */ 159 160 /* 161 * Get a socket structure, and initialize it. 162 * Note that it would probably be better to allocate socket 163 * and PCB at the same time, but I'm not convinced that all 164 * the protocols can be easily modified to do this. 165 */ 166 struct socket * 167 soalloc(int waitok, struct protosw *pr) 168 { 169 struct socket *so; 170 unsigned waitmask; 171 172 waitmask = waitok ? M_WAITOK : M_NOWAIT; 173 so = kmalloc(sizeof(struct socket), M_SOCKET, M_ZERO|waitmask); 174 if (so) { 175 /* XXX race condition for reentrant kernel */ 176 so->so_proto = pr; 177 TAILQ_INIT(&so->so_aiojobq); 178 TAILQ_INIT(&so->so_rcv.ssb_kq.ki_mlist); 179 TAILQ_INIT(&so->so_snd.ssb_kq.ki_mlist); 180 lwkt_token_init(&so->so_rcv.ssb_token, "rcvtok"); 181 lwkt_token_init(&so->so_snd.ssb_token, "sndtok"); 182 spin_init(&so->so_rcvd_spin); 183 netmsg_init(&so->so_rcvd_msg.base, so, &netisr_adone_rport, 184 MSGF_DROPABLE | MSGF_PRIORITY, 185 so->so_proto->pr_usrreqs->pru_rcvd); 186 so->so_rcvd_msg.nm_pru_flags |= PRUR_ASYNC; 187 so->so_state = SS_NOFDREF; 188 so->so_refs = 1; 189 } 190 return so; 191 } 192 193 int 194 socreate(int dom, struct socket **aso, int type, 195 int proto, struct thread *td) 196 { 197 struct proc *p = td->td_proc; 198 struct protosw *prp; 199 struct socket *so; 200 struct pru_attach_info ai; 201 int error; 202 203 if (proto) 204 prp = pffindproto(dom, proto, type); 205 else 206 prp = pffindtype(dom, type); 207 208 if (prp == NULL || prp->pr_usrreqs->pru_attach == 0) 209 return (EPROTONOSUPPORT); 210 211 if (p->p_ucred->cr_prison && jail_socket_unixiproute_only && 212 prp->pr_domain->dom_family != PF_LOCAL && 213 prp->pr_domain->dom_family != PF_INET && 214 prp->pr_domain->dom_family != PF_INET6 && 215 prp->pr_domain->dom_family != PF_ROUTE) { 216 return (EPROTONOSUPPORT); 217 } 218 219 if (prp->pr_type != type) 220 return (EPROTOTYPE); 221 so = soalloc(p != NULL, prp); 222 if (so == NULL) 223 return (ENOBUFS); 224 225 /* 226 * Callers of socreate() presumably will connect up a descriptor 227 * and call soclose() if they cannot. This represents our so_refs 228 * (which should be 1) from soalloc(). 229 */ 230 soclrstate(so, SS_NOFDREF); 231 232 /* 233 * Set a default port for protocol processing. No action will occur 234 * on the socket on this port until an inpcb is attached to it and 235 * is able to match incoming packets, or until the socket becomes 236 * available to userland. 237 * 238 * We normally default the socket to the protocol thread on cpu 0. 239 * If PR_SYNC_PORT is set (unix domain sockets) there is no protocol 240 * thread and all pr_*()/pru_*() calls are executed synchronously. 241 */ 242 if (prp->pr_flags & PR_SYNC_PORT) 243 so->so_port = &netisr_sync_port; 244 else 245 so->so_port = netisr_cpuport(0); 246 247 TAILQ_INIT(&so->so_incomp); 248 TAILQ_INIT(&so->so_comp); 249 so->so_type = type; 250 so->so_cred = crhold(p->p_ucred); 251 ai.sb_rlimit = &p->p_rlimit[RLIMIT_SBSIZE]; 252 ai.p_ucred = p->p_ucred; 253 ai.fd_rdir = p->p_fd->fd_rdir; 254 255 /* 256 * Auto-sizing of socket buffers is managed by the protocols and 257 * the appropriate flags must be set in the pru_attach function. 258 */ 259 error = so_pru_attach(so, proto, &ai); 260 if (error) { 261 sosetstate(so, SS_NOFDREF); 262 sofree(so); /* from soalloc */ 263 return error; 264 } 265 266 /* 267 * NOTE: Returns referenced socket. 268 */ 269 *aso = so; 270 return (0); 271 } 272 273 int 274 sobind(struct socket *so, struct sockaddr *nam, struct thread *td) 275 { 276 int error; 277 278 error = so_pru_bind(so, nam, td); 279 return (error); 280 } 281 282 static void 283 sodealloc(struct socket *so) 284 { 285 if (so->so_rcv.ssb_hiwat) 286 (void)chgsbsize(so->so_cred->cr_uidinfo, 287 &so->so_rcv.ssb_hiwat, 0, RLIM_INFINITY); 288 if (so->so_snd.ssb_hiwat) 289 (void)chgsbsize(so->so_cred->cr_uidinfo, 290 &so->so_snd.ssb_hiwat, 0, RLIM_INFINITY); 291 #ifdef INET 292 /* remove accept filter if present */ 293 if (so->so_accf != NULL) 294 do_setopt_accept_filter(so, NULL); 295 #endif /* INET */ 296 crfree(so->so_cred); 297 if (so->so_faddr != NULL) 298 kfree(so->so_faddr, M_SONAME); 299 kfree(so, M_SOCKET); 300 } 301 302 int 303 solisten(struct socket *so, int backlog, struct thread *td) 304 { 305 int error; 306 #ifdef SCTP 307 short oldopt, oldqlimit; 308 #endif /* SCTP */ 309 310 if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING)) 311 return (EINVAL); 312 313 #ifdef SCTP 314 oldopt = so->so_options; 315 oldqlimit = so->so_qlimit; 316 #endif /* SCTP */ 317 318 lwkt_gettoken(&so->so_rcv.ssb_token); 319 if (TAILQ_EMPTY(&so->so_comp)) 320 so->so_options |= SO_ACCEPTCONN; 321 lwkt_reltoken(&so->so_rcv.ssb_token); 322 if (backlog < 0 || backlog > somaxconn) 323 backlog = somaxconn; 324 so->so_qlimit = backlog; 325 /* SCTP needs to look at tweak both the inbound backlog parameter AND 326 * the so_options (UDP model both connect's and gets inbound 327 * connections .. implicitly). 328 */ 329 error = so_pru_listen(so, td); 330 if (error) { 331 #ifdef SCTP 332 /* Restore the params */ 333 so->so_options = oldopt; 334 so->so_qlimit = oldqlimit; 335 #endif /* SCTP */ 336 return (error); 337 } 338 return (0); 339 } 340 341 /* 342 * Destroy a disconnected socket. This routine is a NOP if entities 343 * still have a reference on the socket: 344 * 345 * so_pcb - The protocol stack still has a reference 346 * SS_NOFDREF - There is no longer a file pointer reference 347 */ 348 void 349 sofree(struct socket *so) 350 { 351 struct socket *head; 352 353 /* 354 * This is a bit hackish at the moment. We need to interlock 355 * any accept queue we are on before we potentially lose the 356 * last reference to avoid races against a re-reference from 357 * someone operating on the queue. 358 */ 359 while ((head = so->so_head) != NULL) { 360 lwkt_getpooltoken(head); 361 if (so->so_head == head) 362 break; 363 lwkt_relpooltoken(head); 364 } 365 366 /* 367 * Arbitrage the last free. 368 */ 369 KKASSERT(so->so_refs > 0); 370 if (atomic_fetchadd_int(&so->so_refs, -1) != 1) { 371 if (head) 372 lwkt_relpooltoken(head); 373 return; 374 } 375 376 KKASSERT(so->so_pcb == NULL && (so->so_state & SS_NOFDREF)); 377 KKASSERT((so->so_state & SS_ASSERTINPROG) == 0); 378 379 /* 380 * We're done, remove ourselves from the accept queue we are 381 * on, if we are on one. 382 */ 383 if (head != NULL) { 384 if (so->so_state & SS_INCOMP) { 385 TAILQ_REMOVE(&head->so_incomp, so, so_list); 386 head->so_incqlen--; 387 } else if (so->so_state & SS_COMP) { 388 /* 389 * We must not decommission a socket that's 390 * on the accept(2) queue. If we do, then 391 * accept(2) may hang after select(2) indicated 392 * that the listening socket was ready. 393 */ 394 lwkt_relpooltoken(head); 395 return; 396 } else { 397 panic("sofree: not queued"); 398 } 399 soclrstate(so, SS_INCOMP); 400 so->so_head = NULL; 401 lwkt_relpooltoken(head); 402 } 403 ssb_release(&so->so_snd, so); 404 sorflush(so); 405 sodealloc(so); 406 } 407 408 /* 409 * Close a socket on last file table reference removal. 410 * Initiate disconnect if connected. 411 * Free socket when disconnect complete. 412 */ 413 int 414 soclose(struct socket *so, int fflag) 415 { 416 int error; 417 418 funsetown(&so->so_sigio); 419 if (!use_soclose_fast || 420 (so->so_proto->pr_flags & PR_SYNC_PORT) || 421 ((so->so_state & SS_ISCONNECTED) && 422 (so->so_options & SO_LINGER))) { 423 error = soclose_sync(so, fflag); 424 } else { 425 soclose_fast(so); 426 error = 0; 427 } 428 return error; 429 } 430 431 static void 432 sodiscard(struct socket *so) 433 { 434 lwkt_getpooltoken(so); 435 if (so->so_options & SO_ACCEPTCONN) { 436 struct socket *sp; 437 438 while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) { 439 TAILQ_REMOVE(&so->so_incomp, sp, so_list); 440 soclrstate(sp, SS_INCOMP); 441 sp->so_head = NULL; 442 so->so_incqlen--; 443 soaborta(sp); 444 } 445 while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) { 446 TAILQ_REMOVE(&so->so_comp, sp, so_list); 447 soclrstate(sp, SS_COMP); 448 sp->so_head = NULL; 449 so->so_qlen--; 450 soaborta(sp); 451 } 452 } 453 lwkt_relpooltoken(so); 454 455 if (so->so_state & SS_NOFDREF) 456 panic("soclose: NOFDREF"); 457 sosetstate(so, SS_NOFDREF); /* take ref */ 458 } 459 460 void 461 soinherit(struct socket *so, struct socket *so_inh) 462 { 463 TAILQ_HEAD(, socket) comp, incomp; 464 struct socket *sp; 465 int qlen, incqlen; 466 467 KASSERT(so->so_options & SO_ACCEPTCONN, 468 ("so does not accept connection")); 469 KASSERT(so_inh->so_options & SO_ACCEPTCONN, 470 ("so_inh does not accept connection")); 471 472 TAILQ_INIT(&comp); 473 TAILQ_INIT(&incomp); 474 475 lwkt_getpooltoken(so); 476 lwkt_getpooltoken(so_inh); 477 478 /* 479 * Save completed queue and incompleted queue 480 */ 481 TAILQ_CONCAT(&comp, &so->so_comp, so_list); 482 qlen = so->so_qlen; 483 so->so_qlen = 0; 484 485 TAILQ_CONCAT(&incomp, &so->so_incomp, so_list); 486 incqlen = so->so_incqlen; 487 so->so_incqlen = 0; 488 489 /* 490 * Append the saved completed queue and incompleted 491 * queue to the socket inherits them. 492 * 493 * XXX 494 * This may temporarily break the inheriting socket's 495 * so_qlimit. 496 */ 497 TAILQ_FOREACH(sp, &comp, so_list) { 498 sp->so_head = so_inh; 499 crfree(sp->so_cred); 500 sp->so_cred = crhold(so_inh->so_cred); 501 } 502 503 TAILQ_FOREACH(sp, &incomp, so_list) { 504 sp->so_head = so_inh; 505 crfree(sp->so_cred); 506 sp->so_cred = crhold(so_inh->so_cred); 507 } 508 509 TAILQ_CONCAT(&so_inh->so_comp, &comp, so_list); 510 so_inh->so_qlen += qlen; 511 512 TAILQ_CONCAT(&so_inh->so_incomp, &incomp, so_list); 513 so_inh->so_incqlen += incqlen; 514 515 lwkt_relpooltoken(so_inh); 516 lwkt_relpooltoken(so); 517 518 if (qlen) { 519 /* 520 * "New" connections have arrived 521 */ 522 sorwakeup(so_inh); 523 wakeup(&so_inh->so_timeo); 524 } 525 } 526 527 static int 528 soclose_sync(struct socket *so, int fflag) 529 { 530 int error = 0; 531 532 if (so->so_pcb == NULL) 533 goto discard; 534 if (so->so_state & SS_ISCONNECTED) { 535 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 536 error = sodisconnect(so); 537 if (error) 538 goto drop; 539 } 540 if (so->so_options & SO_LINGER) { 541 if ((so->so_state & SS_ISDISCONNECTING) && 542 (fflag & FNONBLOCK)) 543 goto drop; 544 while (so->so_state & SS_ISCONNECTED) { 545 error = tsleep(&so->so_timeo, PCATCH, 546 "soclos", so->so_linger * hz); 547 if (error) 548 break; 549 } 550 } 551 } 552 drop: 553 if (so->so_pcb) { 554 int error2; 555 556 error2 = so_pru_detach(so); 557 if (error == 0) 558 error = error2; 559 } 560 discard: 561 sodiscard(so); 562 so_pru_sync(so); /* unpend async sending */ 563 sofree(so); /* dispose of ref */ 564 565 return (error); 566 } 567 568 static void 569 soclose_sofree_async_handler(netmsg_t msg) 570 { 571 sofree(msg->base.nm_so); 572 } 573 574 static void 575 soclose_sofree_async(struct socket *so) 576 { 577 struct netmsg_base *base = &so->so_clomsg; 578 579 netmsg_init(base, so, &netisr_apanic_rport, 0, 580 soclose_sofree_async_handler); 581 lwkt_sendmsg(so->so_port, &base->lmsg); 582 } 583 584 static void 585 soclose_disconn_async_handler(netmsg_t msg) 586 { 587 struct socket *so = msg->base.nm_so; 588 589 if ((so->so_state & SS_ISCONNECTED) && 590 (so->so_state & SS_ISDISCONNECTING) == 0) 591 so_pru_disconnect_direct(so); 592 593 if (so->so_pcb) 594 so_pru_detach_direct(so); 595 596 sodiscard(so); 597 sofree(so); 598 } 599 600 static void 601 soclose_disconn_async(struct socket *so) 602 { 603 struct netmsg_base *base = &so->so_clomsg; 604 605 netmsg_init(base, so, &netisr_apanic_rport, 0, 606 soclose_disconn_async_handler); 607 lwkt_sendmsg(so->so_port, &base->lmsg); 608 } 609 610 static void 611 soclose_detach_async_handler(netmsg_t msg) 612 { 613 struct socket *so = msg->base.nm_so; 614 615 if (so->so_pcb) 616 so_pru_detach_direct(so); 617 618 sodiscard(so); 619 sofree(so); 620 } 621 622 static void 623 soclose_detach_async(struct socket *so) 624 { 625 struct netmsg_base *base = &so->so_clomsg; 626 627 netmsg_init(base, so, &netisr_apanic_rport, 0, 628 soclose_detach_async_handler); 629 lwkt_sendmsg(so->so_port, &base->lmsg); 630 } 631 632 static void 633 soclose_fast(struct socket *so) 634 { 635 if (so->so_pcb == NULL) 636 goto discard; 637 638 if ((so->so_state & SS_ISCONNECTED) && 639 (so->so_state & SS_ISDISCONNECTING) == 0) { 640 soclose_disconn_async(so); 641 return; 642 } 643 644 if (so->so_pcb) { 645 soclose_detach_async(so); 646 return; 647 } 648 649 discard: 650 sodiscard(so); 651 soclose_sofree_async(so); 652 } 653 654 /* 655 * Abort and destroy a socket. Only one abort can be in progress 656 * at any given moment. 657 */ 658 void 659 soabort(struct socket *so) 660 { 661 soreference(so); 662 so_pru_abort(so); 663 } 664 665 void 666 soaborta(struct socket *so) 667 { 668 soreference(so); 669 so_pru_aborta(so); 670 } 671 672 void 673 soabort_oncpu(struct socket *so) 674 { 675 soreference(so); 676 so_pru_abort_oncpu(so); 677 } 678 679 /* 680 * so is passed in ref'd, which becomes owned by 681 * the cleared SS_NOFDREF flag. 682 */ 683 void 684 soaccept_generic(struct socket *so) 685 { 686 if ((so->so_state & SS_NOFDREF) == 0) 687 panic("soaccept: !NOFDREF"); 688 soclrstate(so, SS_NOFDREF); /* owned by lack of SS_NOFDREF */ 689 } 690 691 int 692 soaccept(struct socket *so, struct sockaddr **nam) 693 { 694 int error; 695 696 soaccept_generic(so); 697 error = so_pru_accept(so, nam); 698 return (error); 699 } 700 701 int 702 soconnect(struct socket *so, struct sockaddr *nam, struct thread *td, 703 boolean_t sync) 704 { 705 int error; 706 707 if (so->so_options & SO_ACCEPTCONN) 708 return (EOPNOTSUPP); 709 /* 710 * If protocol is connection-based, can only connect once. 711 * Otherwise, if connected, try to disconnect first. 712 * This allows user to disconnect by connecting to, e.g., 713 * a null address. 714 */ 715 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 716 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 717 (error = sodisconnect(so)))) { 718 error = EISCONN; 719 } else { 720 /* 721 * Prevent accumulated error from previous connection 722 * from biting us. 723 */ 724 so->so_error = 0; 725 if (!sync && so->so_proto->pr_usrreqs->pru_preconnect) 726 error = so_pru_connect_async(so, nam, td); 727 else 728 error = so_pru_connect(so, nam, td); 729 } 730 return (error); 731 } 732 733 int 734 soconnect2(struct socket *so1, struct socket *so2) 735 { 736 int error; 737 738 error = so_pru_connect2(so1, so2); 739 return (error); 740 } 741 742 int 743 sodisconnect(struct socket *so) 744 { 745 int error; 746 747 if ((so->so_state & SS_ISCONNECTED) == 0) { 748 error = ENOTCONN; 749 goto bad; 750 } 751 if (so->so_state & SS_ISDISCONNECTING) { 752 error = EALREADY; 753 goto bad; 754 } 755 error = so_pru_disconnect(so); 756 bad: 757 return (error); 758 } 759 760 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 761 /* 762 * Send on a socket. 763 * If send must go all at once and message is larger than 764 * send buffering, then hard error. 765 * Lock against other senders. 766 * If must go all at once and not enough room now, then 767 * inform user that this would block and do nothing. 768 * Otherwise, if nonblocking, send as much as possible. 769 * The data to be sent is described by "uio" if nonzero, 770 * otherwise by the mbuf chain "top" (which must be null 771 * if uio is not). Data provided in mbuf chain must be small 772 * enough to send all at once. 773 * 774 * Returns nonzero on error, timeout or signal; callers 775 * must check for short counts if EINTR/ERESTART are returned. 776 * Data and control buffers are freed on return. 777 */ 778 int 779 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, 780 struct mbuf *top, struct mbuf *control, int flags, 781 struct thread *td) 782 { 783 struct mbuf **mp; 784 struct mbuf *m; 785 size_t resid; 786 int space, len; 787 int clen = 0, error, dontroute, mlen; 788 int atomic = sosendallatonce(so) || top; 789 int pru_flags; 790 791 if (uio) { 792 resid = uio->uio_resid; 793 } else { 794 resid = (size_t)top->m_pkthdr.len; 795 #ifdef INVARIANTS 796 len = 0; 797 for (m = top; m; m = m->m_next) 798 len += m->m_len; 799 KKASSERT(top->m_pkthdr.len == len); 800 #endif 801 } 802 803 /* 804 * WARNING! resid is unsigned, space and len are signed. space 805 * can wind up negative if the sockbuf is overcommitted. 806 * 807 * Also check to make sure that MSG_EOR isn't used on SOCK_STREAM 808 * type sockets since that's an error. 809 */ 810 if (so->so_type == SOCK_STREAM && (flags & MSG_EOR)) { 811 error = EINVAL; 812 goto out; 813 } 814 815 dontroute = 816 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 817 (so->so_proto->pr_flags & PR_ATOMIC); 818 if (td->td_lwp != NULL) 819 td->td_lwp->lwp_ru.ru_msgsnd++; 820 if (control) 821 clen = control->m_len; 822 #define gotoerr(errcode) { error = errcode; goto release; } 823 824 restart: 825 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags)); 826 if (error) 827 goto out; 828 829 do { 830 if (so->so_state & SS_CANTSENDMORE) 831 gotoerr(EPIPE); 832 if (so->so_error) { 833 error = so->so_error; 834 so->so_error = 0; 835 goto release; 836 } 837 if ((so->so_state & SS_ISCONNECTED) == 0) { 838 /* 839 * `sendto' and `sendmsg' is allowed on a connection- 840 * based socket if it supports implied connect. 841 * Return ENOTCONN if not connected and no address is 842 * supplied. 843 */ 844 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) && 845 (so->so_proto->pr_flags & PR_IMPLOPCL) == 0) { 846 if ((so->so_state & SS_ISCONFIRMING) == 0 && 847 !(resid == 0 && clen != 0)) 848 gotoerr(ENOTCONN); 849 } else if (addr == NULL) 850 gotoerr(so->so_proto->pr_flags & PR_CONNREQUIRED ? 851 ENOTCONN : EDESTADDRREQ); 852 } 853 if ((atomic && resid > so->so_snd.ssb_hiwat) || 854 clen > so->so_snd.ssb_hiwat) { 855 gotoerr(EMSGSIZE); 856 } 857 space = ssb_space(&so->so_snd); 858 if (flags & MSG_OOB) 859 space += 1024; 860 if ((space < 0 || (size_t)space < resid + clen) && uio && 861 (atomic || space < so->so_snd.ssb_lowat || space < clen)) { 862 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) 863 gotoerr(EWOULDBLOCK); 864 ssb_unlock(&so->so_snd); 865 error = ssb_wait(&so->so_snd); 866 if (error) 867 goto out; 868 goto restart; 869 } 870 mp = ⊤ 871 space -= clen; 872 do { 873 if (uio == NULL) { 874 /* 875 * Data is prepackaged in "top". 876 */ 877 resid = 0; 878 if (flags & MSG_EOR) 879 top->m_flags |= M_EOR; 880 } else do { 881 if (resid > INT_MAX) 882 resid = INT_MAX; 883 m = m_getl((int)resid, MB_WAIT, MT_DATA, 884 top == NULL ? M_PKTHDR : 0, &mlen); 885 if (top == NULL) { 886 m->m_pkthdr.len = 0; 887 m->m_pkthdr.rcvif = NULL; 888 } 889 len = imin((int)szmin(mlen, resid), space); 890 if (resid < MINCLSIZE) { 891 /* 892 * For datagram protocols, leave room 893 * for protocol headers in first mbuf. 894 */ 895 if (atomic && top == NULL && len < mlen) 896 MH_ALIGN(m, len); 897 } 898 space -= len; 899 error = uiomove(mtod(m, caddr_t), (size_t)len, uio); 900 resid = uio->uio_resid; 901 m->m_len = len; 902 *mp = m; 903 top->m_pkthdr.len += len; 904 if (error) 905 goto release; 906 mp = &m->m_next; 907 if (resid == 0) { 908 if (flags & MSG_EOR) 909 top->m_flags |= M_EOR; 910 break; 911 } 912 } while (space > 0 && atomic); 913 if (dontroute) 914 so->so_options |= SO_DONTROUTE; 915 if (flags & MSG_OOB) { 916 pru_flags = PRUS_OOB; 917 } else if ((flags & MSG_EOF) && 918 (so->so_proto->pr_flags & PR_IMPLOPCL) && 919 (resid == 0)) { 920 /* 921 * If the user set MSG_EOF, the protocol 922 * understands this flag and nothing left to 923 * send then use PRU_SEND_EOF instead of PRU_SEND. 924 */ 925 pru_flags = PRUS_EOF; 926 } else if (resid > 0 && space > 0) { 927 /* If there is more to send, set PRUS_MORETOCOME */ 928 pru_flags = PRUS_MORETOCOME; 929 } else { 930 pru_flags = 0; 931 } 932 /* 933 * XXX all the SS_CANTSENDMORE checks previously 934 * done could be out of date. We could have recieved 935 * a reset packet in an interrupt or maybe we slept 936 * while doing page faults in uiomove() etc. We could 937 * probably recheck again inside the splnet() protection 938 * here, but there are probably other places that this 939 * also happens. We must rethink this. 940 */ 941 error = so_pru_send(so, pru_flags, top, addr, control, td); 942 if (dontroute) 943 so->so_options &= ~SO_DONTROUTE; 944 clen = 0; 945 control = NULL; 946 top = NULL; 947 mp = ⊤ 948 if (error) 949 goto release; 950 } while (resid && space > 0); 951 } while (resid); 952 953 release: 954 ssb_unlock(&so->so_snd); 955 out: 956 if (top) 957 m_freem(top); 958 if (control) 959 m_freem(control); 960 return (error); 961 } 962 963 #ifdef INET 964 /* 965 * A specialization of sosend() for UDP based on protocol-specific knowledge: 966 * so->so_proto->pr_flags has the PR_ATOMIC field set. This means that 967 * sosendallatonce() returns true, 968 * the "atomic" variable is true, 969 * and sosendudp() blocks until space is available for the entire send. 970 * so->so_proto->pr_flags does not have the PR_CONNREQUIRED or 971 * PR_IMPLOPCL flags set. 972 * UDP has no out-of-band data. 973 * UDP has no control data. 974 * UDP does not support MSG_EOR. 975 */ 976 int 977 sosendudp(struct socket *so, struct sockaddr *addr, struct uio *uio, 978 struct mbuf *top, struct mbuf *control, int flags, struct thread *td) 979 { 980 size_t resid; 981 int error, pru_flags = 0; 982 int space; 983 984 if (td->td_lwp != NULL) 985 td->td_lwp->lwp_ru.ru_msgsnd++; 986 if (control) 987 m_freem(control); 988 989 KASSERT((uio && !top) || (top && !uio), ("bad arguments to sosendudp")); 990 resid = uio ? uio->uio_resid : (size_t)top->m_pkthdr.len; 991 992 restart: 993 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags)); 994 if (error) 995 goto out; 996 997 if (so->so_state & SS_CANTSENDMORE) 998 gotoerr(EPIPE); 999 if (so->so_error) { 1000 error = so->so_error; 1001 so->so_error = 0; 1002 goto release; 1003 } 1004 if (!(so->so_state & SS_ISCONNECTED) && addr == NULL) 1005 gotoerr(EDESTADDRREQ); 1006 if (resid > so->so_snd.ssb_hiwat) 1007 gotoerr(EMSGSIZE); 1008 space = ssb_space(&so->so_snd); 1009 if (uio && (space < 0 || (size_t)space < resid)) { 1010 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) 1011 gotoerr(EWOULDBLOCK); 1012 ssb_unlock(&so->so_snd); 1013 error = ssb_wait(&so->so_snd); 1014 if (error) 1015 goto out; 1016 goto restart; 1017 } 1018 1019 if (uio) { 1020 int hdrlen = max_hdr; 1021 1022 /* 1023 * We try to optimize out the additional mbuf 1024 * allocations in M_PREPEND() on output path, e.g. 1025 * - udp_output(), when it tries to prepend protocol 1026 * headers. 1027 * - Link layer output function, when it tries to 1028 * prepend link layer header. 1029 * 1030 * This probably will not benefit any data that will 1031 * be fragmented, so this optimization is only performed 1032 * when the size of data and max size of protocol+link 1033 * headers fit into one mbuf cluster. 1034 */ 1035 if (uio->uio_resid > MCLBYTES - hdrlen || 1036 !udp_sosend_prepend) { 1037 top = m_uiomove(uio); 1038 if (top == NULL) 1039 goto release; 1040 } else { 1041 int nsize; 1042 1043 top = m_getl(uio->uio_resid + hdrlen, MB_WAIT, 1044 MT_DATA, M_PKTHDR, &nsize); 1045 KASSERT(nsize >= uio->uio_resid + hdrlen, 1046 ("sosendudp invalid nsize %d, " 1047 "resid %zu, hdrlen %d", 1048 nsize, uio->uio_resid, hdrlen)); 1049 1050 top->m_len = uio->uio_resid; 1051 top->m_pkthdr.len = uio->uio_resid; 1052 top->m_data += hdrlen; 1053 1054 error = uiomove(mtod(top, caddr_t), top->m_len, uio); 1055 if (error) 1056 goto out; 1057 } 1058 } 1059 1060 if (flags & MSG_DONTROUTE) 1061 pru_flags |= PRUS_DONTROUTE; 1062 1063 if (udp_sosend_async && (flags & MSG_SYNC) == 0) { 1064 so_pru_send_async(so, pru_flags, top, addr, NULL, td); 1065 error = 0; 1066 } else { 1067 error = so_pru_send(so, pru_flags, top, addr, NULL, td); 1068 } 1069 top = NULL; /* sent or freed in lower layer */ 1070 1071 release: 1072 ssb_unlock(&so->so_snd); 1073 out: 1074 if (top) 1075 m_freem(top); 1076 return (error); 1077 } 1078 1079 int 1080 sosendtcp(struct socket *so, struct sockaddr *addr, struct uio *uio, 1081 struct mbuf *top, struct mbuf *control, int flags, 1082 struct thread *td) 1083 { 1084 struct mbuf **mp; 1085 struct mbuf *m; 1086 size_t resid; 1087 int space, len; 1088 int error, mlen; 1089 int allatonce; 1090 int pru_flags; 1091 1092 if (uio) { 1093 KKASSERT(top == NULL); 1094 allatonce = 0; 1095 resid = uio->uio_resid; 1096 } else { 1097 allatonce = 1; 1098 resid = (size_t)top->m_pkthdr.len; 1099 #ifdef INVARIANTS 1100 len = 0; 1101 for (m = top; m; m = m->m_next) 1102 len += m->m_len; 1103 KKASSERT(top->m_pkthdr.len == len); 1104 #endif 1105 } 1106 1107 /* 1108 * WARNING! resid is unsigned, space and len are signed. space 1109 * can wind up negative if the sockbuf is overcommitted. 1110 * 1111 * Also check to make sure that MSG_EOR isn't used on TCP 1112 */ 1113 if (flags & MSG_EOR) { 1114 error = EINVAL; 1115 goto out; 1116 } 1117 1118 if (control) { 1119 /* TCP doesn't do control messages (rights, creds, etc) */ 1120 if (control->m_len) { 1121 error = EINVAL; 1122 goto out; 1123 } 1124 m_freem(control); /* empty control, just free it */ 1125 control = NULL; 1126 } 1127 1128 if (td->td_lwp != NULL) 1129 td->td_lwp->lwp_ru.ru_msgsnd++; 1130 1131 #define gotoerr(errcode) { error = errcode; goto release; } 1132 1133 restart: 1134 error = ssb_lock(&so->so_snd, SBLOCKWAIT(flags)); 1135 if (error) 1136 goto out; 1137 1138 do { 1139 if (so->so_state & SS_CANTSENDMORE) 1140 gotoerr(EPIPE); 1141 if (so->so_error) { 1142 error = so->so_error; 1143 so->so_error = 0; 1144 goto release; 1145 } 1146 if ((so->so_state & SS_ISCONNECTED) == 0 && 1147 (so->so_state & SS_ISCONFIRMING) == 0) 1148 gotoerr(ENOTCONN); 1149 if (allatonce && resid > so->so_snd.ssb_hiwat) 1150 gotoerr(EMSGSIZE); 1151 1152 space = ssb_space_prealloc(&so->so_snd); 1153 if (flags & MSG_OOB) 1154 space += 1024; 1155 if ((space < 0 || (size_t)space < resid) && !allatonce && 1156 space < so->so_snd.ssb_lowat) { 1157 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) 1158 gotoerr(EWOULDBLOCK); 1159 ssb_unlock(&so->so_snd); 1160 error = ssb_wait(&so->so_snd); 1161 if (error) 1162 goto out; 1163 goto restart; 1164 } 1165 mp = ⊤ 1166 do { 1167 int cnt = 0, async = 0; 1168 1169 if (uio == NULL) { 1170 /* 1171 * Data is prepackaged in "top". 1172 */ 1173 resid = 0; 1174 } else do { 1175 if (resid > INT_MAX) 1176 resid = INT_MAX; 1177 m = m_getl((int)resid, MB_WAIT, MT_DATA, 1178 top == NULL ? M_PKTHDR : 0, &mlen); 1179 if (top == NULL) { 1180 m->m_pkthdr.len = 0; 1181 m->m_pkthdr.rcvif = NULL; 1182 } 1183 len = imin((int)szmin(mlen, resid), space); 1184 space -= len; 1185 error = uiomove(mtod(m, caddr_t), (size_t)len, uio); 1186 resid = uio->uio_resid; 1187 m->m_len = len; 1188 *mp = m; 1189 top->m_pkthdr.len += len; 1190 if (error) 1191 goto release; 1192 mp = &m->m_next; 1193 if (resid == 0) 1194 break; 1195 ++cnt; 1196 } while (space > 0 && cnt < tcp_sosend_agglim); 1197 1198 if (tcp_sosend_async) 1199 async = 1; 1200 1201 if (flags & MSG_OOB) { 1202 pru_flags = PRUS_OOB; 1203 async = 0; 1204 } else if ((flags & MSG_EOF) && resid == 0) { 1205 pru_flags = PRUS_EOF; 1206 } else if (resid > 0 && space > 0) { 1207 /* If there is more to send, set PRUS_MORETOCOME */ 1208 pru_flags = PRUS_MORETOCOME; 1209 async = 1; 1210 } else { 1211 pru_flags = 0; 1212 } 1213 1214 if (flags & MSG_SYNC) 1215 async = 0; 1216 1217 /* 1218 * XXX all the SS_CANTSENDMORE checks previously 1219 * done could be out of date. We could have recieved 1220 * a reset packet in an interrupt or maybe we slept 1221 * while doing page faults in uiomove() etc. We could 1222 * probably recheck again inside the splnet() protection 1223 * here, but there are probably other places that this 1224 * also happens. We must rethink this. 1225 */ 1226 for (m = top; m; m = m->m_next) 1227 ssb_preallocstream(&so->so_snd, m); 1228 if (!async) { 1229 error = so_pru_send(so, pru_flags, top, 1230 NULL, NULL, td); 1231 } else { 1232 so_pru_send_async(so, pru_flags, top, 1233 NULL, NULL, td); 1234 error = 0; 1235 } 1236 1237 top = NULL; 1238 mp = ⊤ 1239 if (error) 1240 goto release; 1241 } while (resid && space > 0); 1242 } while (resid); 1243 1244 release: 1245 ssb_unlock(&so->so_snd); 1246 out: 1247 if (top) 1248 m_freem(top); 1249 if (control) 1250 m_freem(control); 1251 return (error); 1252 } 1253 #endif 1254 1255 /* 1256 * Implement receive operations on a socket. 1257 * 1258 * We depend on the way that records are added to the signalsockbuf 1259 * by sbappend*. In particular, each record (mbufs linked through m_next) 1260 * must begin with an address if the protocol so specifies, 1261 * followed by an optional mbuf or mbufs containing ancillary data, 1262 * and then zero or more mbufs of data. 1263 * 1264 * Although the signalsockbuf is locked, new data may still be appended. 1265 * A token inside the ssb_lock deals with MP issues and still allows 1266 * the network to access the socket if we block in a uio. 1267 * 1268 * The caller may receive the data as a single mbuf chain by supplying 1269 * an mbuf **mp0 for use in returning the chain. The uio is then used 1270 * only for the count in uio_resid. 1271 */ 1272 int 1273 soreceive(struct socket *so, struct sockaddr **psa, struct uio *uio, 1274 struct sockbuf *sio, struct mbuf **controlp, int *flagsp) 1275 { 1276 struct mbuf *m, *n; 1277 struct mbuf *free_chain = NULL; 1278 int flags, len, error, offset; 1279 struct protosw *pr = so->so_proto; 1280 int moff, type = 0; 1281 size_t resid, orig_resid; 1282 1283 if (uio) 1284 resid = uio->uio_resid; 1285 else 1286 resid = (size_t)(sio->sb_climit - sio->sb_cc); 1287 orig_resid = resid; 1288 1289 if (psa) 1290 *psa = NULL; 1291 if (controlp) 1292 *controlp = NULL; 1293 if (flagsp) 1294 flags = *flagsp &~ MSG_EOR; 1295 else 1296 flags = 0; 1297 if (flags & MSG_OOB) { 1298 m = m_get(MB_WAIT, MT_DATA); 1299 if (m == NULL) 1300 return (ENOBUFS); 1301 error = so_pru_rcvoob(so, m, flags & MSG_PEEK); 1302 if (error) 1303 goto bad; 1304 if (sio) { 1305 do { 1306 sbappend(sio, m); 1307 KKASSERT(resid >= (size_t)m->m_len); 1308 resid -= (size_t)m->m_len; 1309 } while (resid > 0 && m); 1310 } else { 1311 do { 1312 uio->uio_resid = resid; 1313 error = uiomove(mtod(m, caddr_t), 1314 (int)szmin(resid, m->m_len), 1315 uio); 1316 resid = uio->uio_resid; 1317 m = m_free(m); 1318 } while (uio->uio_resid && error == 0 && m); 1319 } 1320 bad: 1321 if (m) 1322 m_freem(m); 1323 return (error); 1324 } 1325 if ((so->so_state & SS_ISCONFIRMING) && resid) 1326 so_pru_rcvd(so, 0); 1327 1328 /* 1329 * The token interlocks against the protocol thread while 1330 * ssb_lock is a blocking lock against other userland entities. 1331 */ 1332 lwkt_gettoken(&so->so_rcv.ssb_token); 1333 restart: 1334 error = ssb_lock(&so->so_rcv, SBLOCKWAIT(flags)); 1335 if (error) 1336 goto done; 1337 1338 m = so->so_rcv.ssb_mb; 1339 /* 1340 * If we have less data than requested, block awaiting more 1341 * (subject to any timeout) if: 1342 * 1. the current count is less than the low water mark, or 1343 * 2. MSG_WAITALL is set, and it is possible to do the entire 1344 * receive operation at once if we block (resid <= hiwat). 1345 * 3. MSG_DONTWAIT is not set 1346 * If MSG_WAITALL is set but resid is larger than the receive buffer, 1347 * we have to do the receive in sections, and thus risk returning 1348 * a short count if a timeout or signal occurs after we start. 1349 */ 1350 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 && 1351 (size_t)so->so_rcv.ssb_cc < resid) && 1352 (so->so_rcv.ssb_cc < so->so_rcv.ssb_lowat || 1353 ((flags & MSG_WAITALL) && resid <= (size_t)so->so_rcv.ssb_hiwat)) && 1354 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 1355 KASSERT(m != NULL || !so->so_rcv.ssb_cc, ("receive 1")); 1356 if (so->so_error) { 1357 if (m) 1358 goto dontblock; 1359 error = so->so_error; 1360 if ((flags & MSG_PEEK) == 0) 1361 so->so_error = 0; 1362 goto release; 1363 } 1364 if (so->so_state & SS_CANTRCVMORE) { 1365 if (m) 1366 goto dontblock; 1367 else 1368 goto release; 1369 } 1370 for (; m; m = m->m_next) { 1371 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 1372 m = so->so_rcv.ssb_mb; 1373 goto dontblock; 1374 } 1375 } 1376 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 1377 (pr->pr_flags & PR_CONNREQUIRED)) { 1378 error = ENOTCONN; 1379 goto release; 1380 } 1381 if (resid == 0) 1382 goto release; 1383 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) { 1384 error = EWOULDBLOCK; 1385 goto release; 1386 } 1387 ssb_unlock(&so->so_rcv); 1388 error = ssb_wait(&so->so_rcv); 1389 if (error) 1390 goto done; 1391 goto restart; 1392 } 1393 dontblock: 1394 if (uio && uio->uio_td && uio->uio_td->td_proc) 1395 uio->uio_td->td_lwp->lwp_ru.ru_msgrcv++; 1396 1397 /* 1398 * note: m should be == sb_mb here. Cache the next record while 1399 * cleaning up. Note that calling m_free*() will break out critical 1400 * section. 1401 */ 1402 KKASSERT(m == so->so_rcv.ssb_mb); 1403 1404 /* 1405 * Skip any address mbufs prepending the record. 1406 */ 1407 if (pr->pr_flags & PR_ADDR) { 1408 KASSERT(m->m_type == MT_SONAME, ("receive 1a")); 1409 orig_resid = 0; 1410 if (psa) 1411 *psa = dup_sockaddr(mtod(m, struct sockaddr *)); 1412 if (flags & MSG_PEEK) 1413 m = m->m_next; 1414 else 1415 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain); 1416 } 1417 1418 /* 1419 * Skip any control mbufs prepending the record. 1420 */ 1421 #ifdef SCTP 1422 if (pr->pr_flags & PR_ADDR_OPT) { 1423 /* 1424 * For SCTP we may be getting a 1425 * whole message OR a partial delivery. 1426 */ 1427 if (m && m->m_type == MT_SONAME) { 1428 orig_resid = 0; 1429 if (psa) 1430 *psa = dup_sockaddr(mtod(m, struct sockaddr *)); 1431 if (flags & MSG_PEEK) 1432 m = m->m_next; 1433 else 1434 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain); 1435 } 1436 } 1437 #endif /* SCTP */ 1438 while (m && m->m_type == MT_CONTROL && error == 0) { 1439 if (flags & MSG_PEEK) { 1440 if (controlp) 1441 *controlp = m_copy(m, 0, m->m_len); 1442 m = m->m_next; /* XXX race */ 1443 } else { 1444 if (controlp) { 1445 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL); 1446 if (pr->pr_domain->dom_externalize && 1447 mtod(m, struct cmsghdr *)->cmsg_type == 1448 SCM_RIGHTS) 1449 error = (*pr->pr_domain->dom_externalize)(m); 1450 *controlp = m; 1451 m = n; 1452 } else { 1453 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain); 1454 } 1455 } 1456 if (controlp && *controlp) { 1457 orig_resid = 0; 1458 controlp = &(*controlp)->m_next; 1459 } 1460 } 1461 1462 /* 1463 * flag OOB data. 1464 */ 1465 if (m) { 1466 type = m->m_type; 1467 if (type == MT_OOBDATA) 1468 flags |= MSG_OOB; 1469 } 1470 1471 /* 1472 * Copy to the UIO or mbuf return chain (*mp). 1473 */ 1474 moff = 0; 1475 offset = 0; 1476 while (m && resid > 0 && error == 0) { 1477 if (m->m_type == MT_OOBDATA) { 1478 if (type != MT_OOBDATA) 1479 break; 1480 } else if (type == MT_OOBDATA) 1481 break; 1482 else 1483 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 1484 ("receive 3")); 1485 soclrstate(so, SS_RCVATMARK); 1486 len = (resid > INT_MAX) ? INT_MAX : resid; 1487 if (so->so_oobmark && len > so->so_oobmark - offset) 1488 len = so->so_oobmark - offset; 1489 if (len > m->m_len - moff) 1490 len = m->m_len - moff; 1491 1492 /* 1493 * Copy out to the UIO or pass the mbufs back to the SIO. 1494 * The SIO is dealt with when we eat the mbuf, but deal 1495 * with the resid here either way. 1496 */ 1497 if (uio) { 1498 uio->uio_resid = resid; 1499 error = uiomove(mtod(m, caddr_t) + moff, len, uio); 1500 resid = uio->uio_resid; 1501 if (error) 1502 goto release; 1503 } else { 1504 resid -= (size_t)len; 1505 } 1506 1507 /* 1508 * Eat the entire mbuf or just a piece of it 1509 */ 1510 if (len == m->m_len - moff) { 1511 if (m->m_flags & M_EOR) 1512 flags |= MSG_EOR; 1513 #ifdef SCTP 1514 if (m->m_flags & M_NOTIFICATION) 1515 flags |= MSG_NOTIFICATION; 1516 #endif /* SCTP */ 1517 if (flags & MSG_PEEK) { 1518 m = m->m_next; 1519 moff = 0; 1520 } else { 1521 if (sio) { 1522 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL); 1523 sbappend(sio, m); 1524 m = n; 1525 } else { 1526 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain); 1527 } 1528 } 1529 } else { 1530 if (flags & MSG_PEEK) { 1531 moff += len; 1532 } else { 1533 if (sio) { 1534 n = m_copym(m, 0, len, MB_WAIT); 1535 if (n) 1536 sbappend(sio, n); 1537 } 1538 m->m_data += len; 1539 m->m_len -= len; 1540 so->so_rcv.ssb_cc -= len; 1541 } 1542 } 1543 if (so->so_oobmark) { 1544 if ((flags & MSG_PEEK) == 0) { 1545 so->so_oobmark -= len; 1546 if (so->so_oobmark == 0) { 1547 sosetstate(so, SS_RCVATMARK); 1548 break; 1549 } 1550 } else { 1551 offset += len; 1552 if (offset == so->so_oobmark) 1553 break; 1554 } 1555 } 1556 if (flags & MSG_EOR) 1557 break; 1558 /* 1559 * If the MSG_WAITALL flag is set (for non-atomic socket), 1560 * we must not quit until resid == 0 or an error 1561 * termination. If a signal/timeout occurs, return 1562 * with a short count but without error. 1563 * Keep signalsockbuf locked against other readers. 1564 */ 1565 while ((flags & MSG_WAITALL) && m == NULL && 1566 resid > 0 && !sosendallatonce(so) && 1567 so->so_rcv.ssb_mb == NULL) { 1568 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1569 break; 1570 /* 1571 * The window might have closed to zero, make 1572 * sure we send an ack now that we've drained 1573 * the buffer or we might end up blocking until 1574 * the idle takes over (5 seconds). 1575 */ 1576 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1577 so_pru_rcvd(so, flags); 1578 error = ssb_wait(&so->so_rcv); 1579 if (error) { 1580 ssb_unlock(&so->so_rcv); 1581 error = 0; 1582 goto done; 1583 } 1584 m = so->so_rcv.ssb_mb; 1585 } 1586 } 1587 1588 /* 1589 * If an atomic read was requested but unread data still remains 1590 * in the record, set MSG_TRUNC. 1591 */ 1592 if (m && pr->pr_flags & PR_ATOMIC) 1593 flags |= MSG_TRUNC; 1594 1595 /* 1596 * Cleanup. If an atomic read was requested drop any unread data. 1597 */ 1598 if ((flags & MSG_PEEK) == 0) { 1599 if (m && (pr->pr_flags & PR_ATOMIC)) 1600 sbdroprecord(&so->so_rcv.sb); 1601 if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb) 1602 so_pru_rcvd(so, flags); 1603 } 1604 1605 if (orig_resid == resid && orig_resid && 1606 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1607 ssb_unlock(&so->so_rcv); 1608 goto restart; 1609 } 1610 1611 if (flagsp) 1612 *flagsp |= flags; 1613 release: 1614 ssb_unlock(&so->so_rcv); 1615 done: 1616 lwkt_reltoken(&so->so_rcv.ssb_token); 1617 if (free_chain) 1618 m_freem(free_chain); 1619 return (error); 1620 } 1621 1622 int 1623 sorecvtcp(struct socket *so, struct sockaddr **psa, struct uio *uio, 1624 struct sockbuf *sio, struct mbuf **controlp, int *flagsp) 1625 { 1626 struct mbuf *m, *n; 1627 struct mbuf *free_chain = NULL; 1628 int flags, len, error, offset; 1629 struct protosw *pr = so->so_proto; 1630 int moff; 1631 size_t resid, orig_resid; 1632 1633 if (uio) 1634 resid = uio->uio_resid; 1635 else 1636 resid = (size_t)(sio->sb_climit - sio->sb_cc); 1637 orig_resid = resid; 1638 1639 if (psa) 1640 *psa = NULL; 1641 if (controlp) 1642 *controlp = NULL; 1643 if (flagsp) 1644 flags = *flagsp &~ MSG_EOR; 1645 else 1646 flags = 0; 1647 if (flags & MSG_OOB) { 1648 m = m_get(MB_WAIT, MT_DATA); 1649 if (m == NULL) 1650 return (ENOBUFS); 1651 error = so_pru_rcvoob(so, m, flags & MSG_PEEK); 1652 if (error) 1653 goto bad; 1654 if (sio) { 1655 do { 1656 sbappend(sio, m); 1657 KKASSERT(resid >= (size_t)m->m_len); 1658 resid -= (size_t)m->m_len; 1659 } while (resid > 0 && m); 1660 } else { 1661 do { 1662 uio->uio_resid = resid; 1663 error = uiomove(mtod(m, caddr_t), 1664 (int)szmin(resid, m->m_len), 1665 uio); 1666 resid = uio->uio_resid; 1667 m = m_free(m); 1668 } while (uio->uio_resid && error == 0 && m); 1669 } 1670 bad: 1671 if (m) 1672 m_freem(m); 1673 return (error); 1674 } 1675 1676 /* 1677 * The token interlocks against the protocol thread while 1678 * ssb_lock is a blocking lock against other userland entities. 1679 */ 1680 lwkt_gettoken(&so->so_rcv.ssb_token); 1681 restart: 1682 error = ssb_lock(&so->so_rcv, SBLOCKWAIT(flags)); 1683 if (error) 1684 goto done; 1685 1686 m = so->so_rcv.ssb_mb; 1687 /* 1688 * If we have less data than requested, block awaiting more 1689 * (subject to any timeout) if: 1690 * 1. the current count is less than the low water mark, or 1691 * 2. MSG_WAITALL is set, and it is possible to do the entire 1692 * receive operation at once if we block (resid <= hiwat). 1693 * 3. MSG_DONTWAIT is not set 1694 * If MSG_WAITALL is set but resid is larger than the receive buffer, 1695 * we have to do the receive in sections, and thus risk returning 1696 * a short count if a timeout or signal occurs after we start. 1697 */ 1698 if (m == NULL || (((flags & MSG_DONTWAIT) == 0 && 1699 (size_t)so->so_rcv.ssb_cc < resid) && 1700 (so->so_rcv.ssb_cc < so->so_rcv.ssb_lowat || 1701 ((flags & MSG_WAITALL) && resid <= (size_t)so->so_rcv.ssb_hiwat)))) { 1702 KASSERT(m != NULL || !so->so_rcv.ssb_cc, ("receive 1")); 1703 if (so->so_error) { 1704 if (m) 1705 goto dontblock; 1706 error = so->so_error; 1707 if ((flags & MSG_PEEK) == 0) 1708 so->so_error = 0; 1709 goto release; 1710 } 1711 if (so->so_state & SS_CANTRCVMORE) { 1712 if (m) 1713 goto dontblock; 1714 else 1715 goto release; 1716 } 1717 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 1718 (pr->pr_flags & PR_CONNREQUIRED)) { 1719 error = ENOTCONN; 1720 goto release; 1721 } 1722 if (resid == 0) 1723 goto release; 1724 if (flags & (MSG_FNONBLOCKING|MSG_DONTWAIT)) { 1725 error = EWOULDBLOCK; 1726 goto release; 1727 } 1728 ssb_unlock(&so->so_rcv); 1729 error = ssb_wait(&so->so_rcv); 1730 if (error) 1731 goto done; 1732 goto restart; 1733 } 1734 dontblock: 1735 if (uio && uio->uio_td && uio->uio_td->td_proc) 1736 uio->uio_td->td_lwp->lwp_ru.ru_msgrcv++; 1737 1738 /* 1739 * note: m should be == sb_mb here. Cache the next record while 1740 * cleaning up. Note that calling m_free*() will break out critical 1741 * section. 1742 */ 1743 KKASSERT(m == so->so_rcv.ssb_mb); 1744 1745 /* 1746 * Copy to the UIO or mbuf return chain (*mp). 1747 */ 1748 moff = 0; 1749 offset = 0; 1750 while (m && resid > 0 && error == 0) { 1751 KASSERT(m->m_type == MT_DATA || m->m_type == MT_HEADER, 1752 ("receive 3")); 1753 1754 soclrstate(so, SS_RCVATMARK); 1755 len = (resid > INT_MAX) ? INT_MAX : resid; 1756 if (so->so_oobmark && len > so->so_oobmark - offset) 1757 len = so->so_oobmark - offset; 1758 if (len > m->m_len - moff) 1759 len = m->m_len - moff; 1760 1761 /* 1762 * Copy out to the UIO or pass the mbufs back to the SIO. 1763 * The SIO is dealt with when we eat the mbuf, but deal 1764 * with the resid here either way. 1765 */ 1766 if (uio) { 1767 uio->uio_resid = resid; 1768 error = uiomove(mtod(m, caddr_t) + moff, len, uio); 1769 resid = uio->uio_resid; 1770 if (error) 1771 goto release; 1772 } else { 1773 resid -= (size_t)len; 1774 } 1775 1776 /* 1777 * Eat the entire mbuf or just a piece of it 1778 */ 1779 if (len == m->m_len - moff) { 1780 if (flags & MSG_PEEK) { 1781 m = m->m_next; 1782 moff = 0; 1783 } else { 1784 if (sio) { 1785 n = sbunlinkmbuf(&so->so_rcv.sb, m, NULL); 1786 sbappend(sio, m); 1787 m = n; 1788 } else { 1789 m = sbunlinkmbuf(&so->so_rcv.sb, m, &free_chain); 1790 } 1791 } 1792 } else { 1793 if (flags & MSG_PEEK) { 1794 moff += len; 1795 } else { 1796 if (sio) { 1797 n = m_copym(m, 0, len, MB_WAIT); 1798 if (n) 1799 sbappend(sio, n); 1800 } 1801 m->m_data += len; 1802 m->m_len -= len; 1803 so->so_rcv.ssb_cc -= len; 1804 } 1805 } 1806 if (so->so_oobmark) { 1807 if ((flags & MSG_PEEK) == 0) { 1808 so->so_oobmark -= len; 1809 if (so->so_oobmark == 0) { 1810 sosetstate(so, SS_RCVATMARK); 1811 break; 1812 } 1813 } else { 1814 offset += len; 1815 if (offset == so->so_oobmark) 1816 break; 1817 } 1818 } 1819 /* 1820 * If the MSG_WAITALL flag is set (for non-atomic socket), 1821 * we must not quit until resid == 0 or an error 1822 * termination. If a signal/timeout occurs, return 1823 * with a short count but without error. 1824 * Keep signalsockbuf locked against other readers. 1825 */ 1826 while ((flags & MSG_WAITALL) && m == NULL && 1827 resid > 0 && !sosendallatonce(so) && 1828 so->so_rcv.ssb_mb == NULL) { 1829 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1830 break; 1831 /* 1832 * The window might have closed to zero, make 1833 * sure we send an ack now that we've drained 1834 * the buffer or we might end up blocking until 1835 * the idle takes over (5 seconds). 1836 */ 1837 if (so->so_pcb) 1838 so_pru_rcvd_async(so); 1839 error = ssb_wait(&so->so_rcv); 1840 if (error) { 1841 ssb_unlock(&so->so_rcv); 1842 error = 0; 1843 goto done; 1844 } 1845 m = so->so_rcv.ssb_mb; 1846 } 1847 } 1848 1849 /* 1850 * Cleanup. If an atomic read was requested drop any unread data. 1851 */ 1852 if ((flags & MSG_PEEK) == 0) { 1853 if (so->so_pcb) 1854 so_pru_rcvd_async(so); 1855 } 1856 1857 if (orig_resid == resid && orig_resid && 1858 (so->so_state & SS_CANTRCVMORE) == 0) { 1859 ssb_unlock(&so->so_rcv); 1860 goto restart; 1861 } 1862 1863 if (flagsp) 1864 *flagsp |= flags; 1865 release: 1866 ssb_unlock(&so->so_rcv); 1867 done: 1868 lwkt_reltoken(&so->so_rcv.ssb_token); 1869 if (free_chain) 1870 m_freem(free_chain); 1871 return (error); 1872 } 1873 1874 /* 1875 * Shut a socket down. Note that we do not get a frontend lock as we 1876 * want to be able to shut the socket down even if another thread is 1877 * blocked in a read(), thus waking it up. 1878 */ 1879 int 1880 soshutdown(struct socket *so, int how) 1881 { 1882 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1883 return (EINVAL); 1884 1885 if (how != SHUT_WR) { 1886 /*ssb_lock(&so->so_rcv, M_WAITOK);*/ 1887 sorflush(so); 1888 /*ssb_unlock(&so->so_rcv);*/ 1889 } 1890 if (how != SHUT_RD) 1891 return (so_pru_shutdown(so)); 1892 return (0); 1893 } 1894 1895 void 1896 sorflush(struct socket *so) 1897 { 1898 struct signalsockbuf *ssb = &so->so_rcv; 1899 struct protosw *pr = so->so_proto; 1900 struct signalsockbuf asb; 1901 1902 atomic_set_int(&ssb->ssb_flags, SSB_NOINTR); 1903 1904 lwkt_gettoken(&ssb->ssb_token); 1905 socantrcvmore(so); 1906 asb = *ssb; 1907 1908 /* 1909 * Can't just blow up the ssb structure here 1910 */ 1911 bzero(&ssb->sb, sizeof(ssb->sb)); 1912 ssb->ssb_timeo = 0; 1913 ssb->ssb_lowat = 0; 1914 ssb->ssb_hiwat = 0; 1915 ssb->ssb_mbmax = 0; 1916 atomic_clear_int(&ssb->ssb_flags, SSB_CLEAR_MASK); 1917 1918 if ((pr->pr_flags & PR_RIGHTS) && pr->pr_domain->dom_dispose) 1919 (*pr->pr_domain->dom_dispose)(asb.ssb_mb); 1920 ssb_release(&asb, so); 1921 1922 lwkt_reltoken(&ssb->ssb_token); 1923 } 1924 1925 #ifdef INET 1926 static int 1927 do_setopt_accept_filter(struct socket *so, struct sockopt *sopt) 1928 { 1929 struct accept_filter_arg *afap = NULL; 1930 struct accept_filter *afp; 1931 struct so_accf *af = so->so_accf; 1932 int error = 0; 1933 1934 /* do not set/remove accept filters on non listen sockets */ 1935 if ((so->so_options & SO_ACCEPTCONN) == 0) { 1936 error = EINVAL; 1937 goto out; 1938 } 1939 1940 /* removing the filter */ 1941 if (sopt == NULL) { 1942 if (af != NULL) { 1943 if (af->so_accept_filter != NULL && 1944 af->so_accept_filter->accf_destroy != NULL) { 1945 af->so_accept_filter->accf_destroy(so); 1946 } 1947 if (af->so_accept_filter_str != NULL) { 1948 kfree(af->so_accept_filter_str, M_ACCF); 1949 } 1950 kfree(af, M_ACCF); 1951 so->so_accf = NULL; 1952 } 1953 so->so_options &= ~SO_ACCEPTFILTER; 1954 return (0); 1955 } 1956 /* adding a filter */ 1957 /* must remove previous filter first */ 1958 if (af != NULL) { 1959 error = EINVAL; 1960 goto out; 1961 } 1962 /* don't put large objects on the kernel stack */ 1963 afap = kmalloc(sizeof(*afap), M_TEMP, M_WAITOK); 1964 error = sooptcopyin(sopt, afap, sizeof *afap, sizeof *afap); 1965 afap->af_name[sizeof(afap->af_name)-1] = '\0'; 1966 afap->af_arg[sizeof(afap->af_arg)-1] = '\0'; 1967 if (error) 1968 goto out; 1969 afp = accept_filt_get(afap->af_name); 1970 if (afp == NULL) { 1971 error = ENOENT; 1972 goto out; 1973 } 1974 af = kmalloc(sizeof(*af), M_ACCF, M_WAITOK | M_ZERO); 1975 if (afp->accf_create != NULL) { 1976 if (afap->af_name[0] != '\0') { 1977 int len = strlen(afap->af_name) + 1; 1978 1979 af->so_accept_filter_str = kmalloc(len, M_ACCF, 1980 M_WAITOK); 1981 strcpy(af->so_accept_filter_str, afap->af_name); 1982 } 1983 af->so_accept_filter_arg = afp->accf_create(so, afap->af_arg); 1984 if (af->so_accept_filter_arg == NULL) { 1985 kfree(af->so_accept_filter_str, M_ACCF); 1986 kfree(af, M_ACCF); 1987 so->so_accf = NULL; 1988 error = EINVAL; 1989 goto out; 1990 } 1991 } 1992 af->so_accept_filter = afp; 1993 so->so_accf = af; 1994 so->so_options |= SO_ACCEPTFILTER; 1995 out: 1996 if (afap != NULL) 1997 kfree(afap, M_TEMP); 1998 return (error); 1999 } 2000 #endif /* INET */ 2001 2002 /* 2003 * Perhaps this routine, and sooptcopyout(), below, ought to come in 2004 * an additional variant to handle the case where the option value needs 2005 * to be some kind of integer, but not a specific size. 2006 * In addition to their use here, these functions are also called by the 2007 * protocol-level pr_ctloutput() routines. 2008 */ 2009 int 2010 sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen) 2011 { 2012 return soopt_to_kbuf(sopt, buf, len, minlen); 2013 } 2014 2015 int 2016 soopt_to_kbuf(struct sockopt *sopt, void *buf, size_t len, size_t minlen) 2017 { 2018 size_t valsize; 2019 2020 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 2021 KKASSERT(kva_p(buf)); 2022 2023 /* 2024 * If the user gives us more than we wanted, we ignore it, 2025 * but if we don't get the minimum length the caller 2026 * wants, we return EINVAL. On success, sopt->sopt_valsize 2027 * is set to however much we actually retrieved. 2028 */ 2029 if ((valsize = sopt->sopt_valsize) < minlen) 2030 return EINVAL; 2031 if (valsize > len) 2032 sopt->sopt_valsize = valsize = len; 2033 2034 bcopy(sopt->sopt_val, buf, valsize); 2035 return 0; 2036 } 2037 2038 2039 int 2040 sosetopt(struct socket *so, struct sockopt *sopt) 2041 { 2042 int error, optval; 2043 struct linger l; 2044 struct timeval tv; 2045 u_long val; 2046 struct signalsockbuf *sotmp; 2047 2048 error = 0; 2049 sopt->sopt_dir = SOPT_SET; 2050 if (sopt->sopt_level != SOL_SOCKET) { 2051 if (so->so_proto && so->so_proto->pr_ctloutput) { 2052 return (so_pr_ctloutput(so, sopt)); 2053 } 2054 error = ENOPROTOOPT; 2055 } else { 2056 switch (sopt->sopt_name) { 2057 #ifdef INET 2058 case SO_ACCEPTFILTER: 2059 error = do_setopt_accept_filter(so, sopt); 2060 if (error) 2061 goto bad; 2062 break; 2063 #endif /* INET */ 2064 case SO_LINGER: 2065 error = sooptcopyin(sopt, &l, sizeof l, sizeof l); 2066 if (error) 2067 goto bad; 2068 2069 so->so_linger = l.l_linger; 2070 if (l.l_onoff) 2071 so->so_options |= SO_LINGER; 2072 else 2073 so->so_options &= ~SO_LINGER; 2074 break; 2075 2076 case SO_DEBUG: 2077 case SO_KEEPALIVE: 2078 case SO_DONTROUTE: 2079 case SO_USELOOPBACK: 2080 case SO_BROADCAST: 2081 case SO_REUSEADDR: 2082 case SO_REUSEPORT: 2083 case SO_OOBINLINE: 2084 case SO_TIMESTAMP: 2085 case SO_NOSIGPIPE: 2086 error = sooptcopyin(sopt, &optval, sizeof optval, 2087 sizeof optval); 2088 if (error) 2089 goto bad; 2090 if (optval) 2091 so->so_options |= sopt->sopt_name; 2092 else 2093 so->so_options &= ~sopt->sopt_name; 2094 break; 2095 2096 case SO_SNDBUF: 2097 case SO_RCVBUF: 2098 case SO_SNDLOWAT: 2099 case SO_RCVLOWAT: 2100 error = sooptcopyin(sopt, &optval, sizeof optval, 2101 sizeof optval); 2102 if (error) 2103 goto bad; 2104 2105 /* 2106 * Values < 1 make no sense for any of these 2107 * options, so disallow them. 2108 */ 2109 if (optval < 1) { 2110 error = EINVAL; 2111 goto bad; 2112 } 2113 2114 switch (sopt->sopt_name) { 2115 case SO_SNDBUF: 2116 case SO_RCVBUF: 2117 if (ssb_reserve(sopt->sopt_name == SO_SNDBUF ? 2118 &so->so_snd : &so->so_rcv, (u_long)optval, 2119 so, 2120 &curproc->p_rlimit[RLIMIT_SBSIZE]) == 0) { 2121 error = ENOBUFS; 2122 goto bad; 2123 } 2124 sotmp = (sopt->sopt_name == SO_SNDBUF) ? 2125 &so->so_snd : &so->so_rcv; 2126 atomic_clear_int(&sotmp->ssb_flags, 2127 SSB_AUTOSIZE); 2128 break; 2129 2130 /* 2131 * Make sure the low-water is never greater than 2132 * the high-water. 2133 */ 2134 case SO_SNDLOWAT: 2135 so->so_snd.ssb_lowat = 2136 (optval > so->so_snd.ssb_hiwat) ? 2137 so->so_snd.ssb_hiwat : optval; 2138 atomic_clear_int(&so->so_snd.ssb_flags, 2139 SSB_AUTOLOWAT); 2140 break; 2141 case SO_RCVLOWAT: 2142 so->so_rcv.ssb_lowat = 2143 (optval > so->so_rcv.ssb_hiwat) ? 2144 so->so_rcv.ssb_hiwat : optval; 2145 atomic_clear_int(&so->so_rcv.ssb_flags, 2146 SSB_AUTOLOWAT); 2147 break; 2148 } 2149 break; 2150 2151 case SO_SNDTIMEO: 2152 case SO_RCVTIMEO: 2153 error = sooptcopyin(sopt, &tv, sizeof tv, 2154 sizeof tv); 2155 if (error) 2156 goto bad; 2157 2158 /* assert(hz > 0); */ 2159 if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz || 2160 tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 2161 error = EDOM; 2162 goto bad; 2163 } 2164 /* assert(tick > 0); */ 2165 /* assert(ULONG_MAX - INT_MAX >= 1000000); */ 2166 val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / ustick; 2167 if (val > INT_MAX) { 2168 error = EDOM; 2169 goto bad; 2170 } 2171 if (val == 0 && tv.tv_usec != 0) 2172 val = 1; 2173 2174 switch (sopt->sopt_name) { 2175 case SO_SNDTIMEO: 2176 so->so_snd.ssb_timeo = val; 2177 break; 2178 case SO_RCVTIMEO: 2179 so->so_rcv.ssb_timeo = val; 2180 break; 2181 } 2182 break; 2183 default: 2184 error = ENOPROTOOPT; 2185 break; 2186 } 2187 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 2188 (void) so_pr_ctloutput(so, sopt); 2189 } 2190 } 2191 bad: 2192 return (error); 2193 } 2194 2195 /* Helper routine for getsockopt */ 2196 int 2197 sooptcopyout(struct sockopt *sopt, const void *buf, size_t len) 2198 { 2199 soopt_from_kbuf(sopt, buf, len); 2200 return 0; 2201 } 2202 2203 void 2204 soopt_from_kbuf(struct sockopt *sopt, const void *buf, size_t len) 2205 { 2206 size_t valsize; 2207 2208 if (len == 0) { 2209 sopt->sopt_valsize = 0; 2210 return; 2211 } 2212 2213 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 2214 KKASSERT(kva_p(buf)); 2215 2216 /* 2217 * Documented get behavior is that we always return a value, 2218 * possibly truncated to fit in the user's buffer. 2219 * Traditional behavior is that we always tell the user 2220 * precisely how much we copied, rather than something useful 2221 * like the total amount we had available for her. 2222 * Note that this interface is not idempotent; the entire answer must 2223 * generated ahead of time. 2224 */ 2225 valsize = szmin(len, sopt->sopt_valsize); 2226 sopt->sopt_valsize = valsize; 2227 if (sopt->sopt_val != 0) { 2228 bcopy(buf, sopt->sopt_val, valsize); 2229 } 2230 } 2231 2232 int 2233 sogetopt(struct socket *so, struct sockopt *sopt) 2234 { 2235 int error, optval; 2236 long optval_l; 2237 struct linger l; 2238 struct timeval tv; 2239 #ifdef INET 2240 struct accept_filter_arg *afap; 2241 #endif 2242 2243 error = 0; 2244 sopt->sopt_dir = SOPT_GET; 2245 if (sopt->sopt_level != SOL_SOCKET) { 2246 if (so->so_proto && so->so_proto->pr_ctloutput) { 2247 return (so_pr_ctloutput(so, sopt)); 2248 } else 2249 return (ENOPROTOOPT); 2250 } else { 2251 switch (sopt->sopt_name) { 2252 #ifdef INET 2253 case SO_ACCEPTFILTER: 2254 if ((so->so_options & SO_ACCEPTCONN) == 0) 2255 return (EINVAL); 2256 afap = kmalloc(sizeof(*afap), M_TEMP, 2257 M_WAITOK | M_ZERO); 2258 if ((so->so_options & SO_ACCEPTFILTER) != 0) { 2259 strcpy(afap->af_name, so->so_accf->so_accept_filter->accf_name); 2260 if (so->so_accf->so_accept_filter_str != NULL) 2261 strcpy(afap->af_arg, so->so_accf->so_accept_filter_str); 2262 } 2263 error = sooptcopyout(sopt, afap, sizeof(*afap)); 2264 kfree(afap, M_TEMP); 2265 break; 2266 #endif /* INET */ 2267 2268 case SO_LINGER: 2269 l.l_onoff = so->so_options & SO_LINGER; 2270 l.l_linger = so->so_linger; 2271 error = sooptcopyout(sopt, &l, sizeof l); 2272 break; 2273 2274 case SO_USELOOPBACK: 2275 case SO_DONTROUTE: 2276 case SO_DEBUG: 2277 case SO_KEEPALIVE: 2278 case SO_REUSEADDR: 2279 case SO_REUSEPORT: 2280 case SO_BROADCAST: 2281 case SO_OOBINLINE: 2282 case SO_TIMESTAMP: 2283 case SO_NOSIGPIPE: 2284 optval = so->so_options & sopt->sopt_name; 2285 integer: 2286 error = sooptcopyout(sopt, &optval, sizeof optval); 2287 break; 2288 2289 case SO_TYPE: 2290 optval = so->so_type; 2291 goto integer; 2292 2293 case SO_ERROR: 2294 optval = so->so_error; 2295 so->so_error = 0; 2296 goto integer; 2297 2298 case SO_SNDBUF: 2299 optval = so->so_snd.ssb_hiwat; 2300 goto integer; 2301 2302 case SO_RCVBUF: 2303 optval = so->so_rcv.ssb_hiwat; 2304 goto integer; 2305 2306 case SO_SNDLOWAT: 2307 optval = so->so_snd.ssb_lowat; 2308 goto integer; 2309 2310 case SO_RCVLOWAT: 2311 optval = so->so_rcv.ssb_lowat; 2312 goto integer; 2313 2314 case SO_SNDTIMEO: 2315 case SO_RCVTIMEO: 2316 optval = (sopt->sopt_name == SO_SNDTIMEO ? 2317 so->so_snd.ssb_timeo : so->so_rcv.ssb_timeo); 2318 2319 tv.tv_sec = optval / hz; 2320 tv.tv_usec = (optval % hz) * ustick; 2321 error = sooptcopyout(sopt, &tv, sizeof tv); 2322 break; 2323 2324 case SO_SNDSPACE: 2325 optval_l = ssb_space(&so->so_snd); 2326 error = sooptcopyout(sopt, &optval_l, sizeof(optval_l)); 2327 break; 2328 2329 default: 2330 error = ENOPROTOOPT; 2331 break; 2332 } 2333 return (error); 2334 } 2335 } 2336 2337 /* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */ 2338 int 2339 soopt_getm(struct sockopt *sopt, struct mbuf **mp) 2340 { 2341 struct mbuf *m, *m_prev; 2342 int sopt_size = sopt->sopt_valsize, msize; 2343 2344 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_DATA, 2345 0, &msize); 2346 if (m == NULL) 2347 return (ENOBUFS); 2348 m->m_len = min(msize, sopt_size); 2349 sopt_size -= m->m_len; 2350 *mp = m; 2351 m_prev = m; 2352 2353 while (sopt_size > 0) { 2354 m = m_getl(sopt_size, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, 2355 MT_DATA, 0, &msize); 2356 if (m == NULL) { 2357 m_freem(*mp); 2358 return (ENOBUFS); 2359 } 2360 m->m_len = min(msize, sopt_size); 2361 sopt_size -= m->m_len; 2362 m_prev->m_next = m; 2363 m_prev = m; 2364 } 2365 return (0); 2366 } 2367 2368 /* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */ 2369 int 2370 soopt_mcopyin(struct sockopt *sopt, struct mbuf *m) 2371 { 2372 soopt_to_mbuf(sopt, m); 2373 return 0; 2374 } 2375 2376 void 2377 soopt_to_mbuf(struct sockopt *sopt, struct mbuf *m) 2378 { 2379 size_t valsize; 2380 void *val; 2381 2382 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 2383 KKASSERT(kva_p(m)); 2384 if (sopt->sopt_val == NULL) 2385 return; 2386 val = sopt->sopt_val; 2387 valsize = sopt->sopt_valsize; 2388 while (m != NULL && valsize >= m->m_len) { 2389 bcopy(val, mtod(m, char *), m->m_len); 2390 valsize -= m->m_len; 2391 val = (caddr_t)val + m->m_len; 2392 m = m->m_next; 2393 } 2394 if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */ 2395 panic("ip6_sooptmcopyin"); 2396 } 2397 2398 /* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */ 2399 int 2400 soopt_mcopyout(struct sockopt *sopt, struct mbuf *m) 2401 { 2402 return soopt_from_mbuf(sopt, m); 2403 } 2404 2405 int 2406 soopt_from_mbuf(struct sockopt *sopt, struct mbuf *m) 2407 { 2408 struct mbuf *m0 = m; 2409 size_t valsize = 0; 2410 size_t maxsize; 2411 void *val; 2412 2413 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 2414 KKASSERT(kva_p(m)); 2415 if (sopt->sopt_val == NULL) 2416 return 0; 2417 val = sopt->sopt_val; 2418 maxsize = sopt->sopt_valsize; 2419 while (m != NULL && maxsize >= m->m_len) { 2420 bcopy(mtod(m, char *), val, m->m_len); 2421 maxsize -= m->m_len; 2422 val = (caddr_t)val + m->m_len; 2423 valsize += m->m_len; 2424 m = m->m_next; 2425 } 2426 if (m != NULL) { 2427 /* enough soopt buffer should be given from user-land */ 2428 m_freem(m0); 2429 return (EINVAL); 2430 } 2431 sopt->sopt_valsize = valsize; 2432 return 0; 2433 } 2434 2435 void 2436 sohasoutofband(struct socket *so) 2437 { 2438 if (so->so_sigio != NULL) 2439 pgsigio(so->so_sigio, SIGURG, 0); 2440 KNOTE(&so->so_rcv.ssb_kq.ki_note, NOTE_OOB); 2441 } 2442 2443 int 2444 sokqfilter(struct file *fp, struct knote *kn) 2445 { 2446 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2447 struct signalsockbuf *ssb; 2448 2449 switch (kn->kn_filter) { 2450 case EVFILT_READ: 2451 if (so->so_options & SO_ACCEPTCONN) 2452 kn->kn_fop = &solisten_filtops; 2453 else 2454 kn->kn_fop = &soread_filtops; 2455 ssb = &so->so_rcv; 2456 break; 2457 case EVFILT_WRITE: 2458 kn->kn_fop = &sowrite_filtops; 2459 ssb = &so->so_snd; 2460 break; 2461 case EVFILT_EXCEPT: 2462 kn->kn_fop = &soexcept_filtops; 2463 ssb = &so->so_rcv; 2464 break; 2465 default: 2466 return (EOPNOTSUPP); 2467 } 2468 2469 knote_insert(&ssb->ssb_kq.ki_note, kn); 2470 atomic_set_int(&ssb->ssb_flags, SSB_KNOTE); 2471 return (0); 2472 } 2473 2474 static void 2475 filt_sordetach(struct knote *kn) 2476 { 2477 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2478 2479 knote_remove(&so->so_rcv.ssb_kq.ki_note, kn); 2480 if (SLIST_EMPTY(&so->so_rcv.ssb_kq.ki_note)) 2481 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_KNOTE); 2482 } 2483 2484 /*ARGSUSED*/ 2485 static int 2486 filt_soread(struct knote *kn, long hint) 2487 { 2488 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2489 2490 if (kn->kn_sfflags & NOTE_OOB) { 2491 if ((so->so_oobmark || (so->so_state & SS_RCVATMARK))) { 2492 kn->kn_fflags |= NOTE_OOB; 2493 return (1); 2494 } 2495 return (0); 2496 } 2497 kn->kn_data = so->so_rcv.ssb_cc; 2498 2499 if (so->so_state & SS_CANTRCVMORE) { 2500 /* 2501 * Only set NODATA if all data has been exhausted. 2502 */ 2503 if (kn->kn_data == 0) 2504 kn->kn_flags |= EV_NODATA; 2505 kn->kn_flags |= EV_EOF; 2506 kn->kn_fflags = so->so_error; 2507 return (1); 2508 } 2509 if (so->so_error) /* temporary udp error */ 2510 return (1); 2511 if (kn->kn_sfflags & NOTE_LOWAT) 2512 return (kn->kn_data >= kn->kn_sdata); 2513 return ((kn->kn_data >= so->so_rcv.ssb_lowat) || 2514 !TAILQ_EMPTY(&so->so_comp)); 2515 } 2516 2517 static void 2518 filt_sowdetach(struct knote *kn) 2519 { 2520 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2521 2522 knote_remove(&so->so_snd.ssb_kq.ki_note, kn); 2523 if (SLIST_EMPTY(&so->so_snd.ssb_kq.ki_note)) 2524 atomic_clear_int(&so->so_snd.ssb_flags, SSB_KNOTE); 2525 } 2526 2527 /*ARGSUSED*/ 2528 static int 2529 filt_sowrite(struct knote *kn, long hint) 2530 { 2531 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2532 2533 kn->kn_data = ssb_space(&so->so_snd); 2534 if (so->so_state & SS_CANTSENDMORE) { 2535 kn->kn_flags |= (EV_EOF | EV_NODATA); 2536 kn->kn_fflags = so->so_error; 2537 return (1); 2538 } 2539 if (so->so_error) /* temporary udp error */ 2540 return (1); 2541 if (((so->so_state & SS_ISCONNECTED) == 0) && 2542 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 2543 return (0); 2544 if (kn->kn_sfflags & NOTE_LOWAT) 2545 return (kn->kn_data >= kn->kn_sdata); 2546 return (kn->kn_data >= so->so_snd.ssb_lowat); 2547 } 2548 2549 /*ARGSUSED*/ 2550 static int 2551 filt_solisten(struct knote *kn, long hint) 2552 { 2553 struct socket *so = (struct socket *)kn->kn_fp->f_data; 2554 2555 kn->kn_data = so->so_qlen; 2556 return (! TAILQ_EMPTY(&so->so_comp)); 2557 } 2558