uipc_socket.c revision 1.83.2.4
1 /* $NetBSD: uipc_socket.c,v 1.83.2.4 2004/09/03 12:45:39 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1982, 1986, 1988, 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)uipc_socket.c 8.6 (Berkeley) 5/2/95 68 */ 69 70 #include <sys/cdefs.h> 71 __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.83.2.4 2004/09/03 12:45:39 skrll Exp $"); 72 73 #include "opt_sock_counters.h" 74 #include "opt_sosend_loan.h" 75 #include "opt_mbuftrace.h" 76 #include "opt_somaxkva.h" 77 78 #include <sys/param.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 #include <sys/file.h> 82 #include <sys/malloc.h> 83 #include <sys/mbuf.h> 84 #include <sys/domain.h> 85 #include <sys/kernel.h> 86 #include <sys/protosw.h> 87 #include <sys/socket.h> 88 #include <sys/socketvar.h> 89 #include <sys/signalvar.h> 90 #include <sys/resourcevar.h> 91 #include <sys/pool.h> 92 #include <sys/event.h> 93 #include <sys/poll.h> 94 95 #include <uvm/uvm.h> 96 97 POOL_INIT(socket_pool, sizeof(struct socket), 0, 0, 0, "sockpl", NULL); 98 99 MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options"); 100 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 101 102 extern int somaxconn; /* patchable (XXX sysctl) */ 103 int somaxconn = SOMAXCONN; 104 105 #ifdef SOSEND_COUNTERS 106 #include <sys/device.h> 107 108 struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 109 NULL, "sosend", "loan big"); 110 struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 111 NULL, "sosend", "copy big"); 112 struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 113 NULL, "sosend", "copy small"); 114 struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 115 NULL, "sosend", "kva limit"); 116 117 #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++ 118 119 EVCNT_ATTACH_STATIC(sosend_loan_big); 120 EVCNT_ATTACH_STATIC(sosend_copy_big); 121 EVCNT_ATTACH_STATIC(sosend_copy_small); 122 EVCNT_ATTACH_STATIC(sosend_kvalimit); 123 #else 124 125 #define SOSEND_COUNTER_INCR(ev) /* nothing */ 126 127 #endif /* SOSEND_COUNTERS */ 128 129 void 130 soinit(void) 131 { 132 133 /* Set the initial adjusted socket buffer size. */ 134 if (sb_max_set(sb_max)) 135 panic("bad initial sb_max value: %lu\n", sb_max); 136 137 } 138 139 #ifdef SOSEND_NO_LOAN 140 int use_sosend_loan = 0; 141 #else 142 int use_sosend_loan = 1; 143 #endif 144 145 struct simplelock so_pendfree_slock = SIMPLELOCK_INITIALIZER; 146 struct mbuf *so_pendfree; 147 148 #ifndef SOMAXKVA 149 #define SOMAXKVA (16 * 1024 * 1024) 150 #endif 151 int somaxkva = SOMAXKVA; 152 int socurkva; 153 int sokvawaiters; 154 155 #define SOCK_LOAN_THRESH 4096 156 #define SOCK_LOAN_CHUNK 65536 157 158 static size_t sodopendfree(struct socket *); 159 static size_t sodopendfreel(struct socket *); 160 static __inline vsize_t sokvareserve(struct socket *, vsize_t); 161 static __inline void sokvaunreserve(vsize_t); 162 163 static __inline vsize_t 164 sokvareserve(struct socket *so, vsize_t len) 165 { 166 int s; 167 int error; 168 169 s = splvm(); 170 simple_lock(&so_pendfree_slock); 171 while (socurkva + len > somaxkva) { 172 size_t freed; 173 174 /* 175 * try to do pendfree. 176 */ 177 178 freed = sodopendfreel(so); 179 180 /* 181 * if some kva was freed, try again. 182 */ 183 184 if (freed) 185 continue; 186 187 SOSEND_COUNTER_INCR(&sosend_kvalimit); 188 sokvawaiters++; 189 error = ltsleep(&socurkva, PVM | PCATCH, "sokva", 0, 190 &so_pendfree_slock); 191 sokvawaiters--; 192 if (error) { 193 len = 0; 194 break; 195 } 196 } 197 socurkva += len; 198 simple_unlock(&so_pendfree_slock); 199 splx(s); 200 return len; 201 } 202 203 static __inline void 204 sokvaunreserve(vsize_t len) 205 { 206 int s; 207 208 s = splvm(); 209 simple_lock(&so_pendfree_slock); 210 socurkva -= len; 211 if (sokvawaiters) 212 wakeup(&socurkva); 213 simple_unlock(&so_pendfree_slock); 214 splx(s); 215 } 216 217 /* 218 * sokvaalloc: allocate kva for loan. 219 */ 220 221 vaddr_t 222 sokvaalloc(vsize_t len, struct socket *so) 223 { 224 vaddr_t lva; 225 226 /* 227 * reserve kva. 228 */ 229 230 if (sokvareserve(so, len) == 0) 231 return 0; 232 233 /* 234 * allocate kva. 235 */ 236 237 lva = uvm_km_valloc_wait(kernel_map, len); 238 if (lva == 0) { 239 sokvaunreserve(len); 240 return (0); 241 } 242 243 return lva; 244 } 245 246 /* 247 * sokvafree: free kva for loan. 248 */ 249 250 void 251 sokvafree(vaddr_t sva, vsize_t len) 252 { 253 254 /* 255 * free kva. 256 */ 257 258 uvm_km_free(kernel_map, sva, len); 259 260 /* 261 * unreserve kva. 262 */ 263 264 sokvaunreserve(len); 265 } 266 267 static void 268 sodoloanfree(struct vm_page **pgs, caddr_t buf, size_t size) 269 { 270 vaddr_t va, sva, eva; 271 vsize_t len; 272 paddr_t pa; 273 int i, npgs; 274 275 eva = round_page((vaddr_t) buf + size); 276 sva = trunc_page((vaddr_t) buf); 277 len = eva - sva; 278 npgs = len >> PAGE_SHIFT; 279 280 if (__predict_false(pgs == NULL)) { 281 pgs = alloca(npgs * sizeof(*pgs)); 282 283 for (i = 0, va = sva; va < eva; i++, va += PAGE_SIZE) { 284 if (pmap_extract(pmap_kernel(), va, &pa) == FALSE) 285 panic("sodoloanfree: va 0x%lx not mapped", va); 286 pgs[i] = PHYS_TO_VM_PAGE(pa); 287 } 288 } 289 290 pmap_kremove(sva, len); 291 pmap_update(pmap_kernel()); 292 uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE); 293 sokvafree(sva, len); 294 } 295 296 static size_t 297 sodopendfree(struct socket *so) 298 { 299 int s; 300 size_t rv; 301 302 s = splvm(); 303 simple_lock(&so_pendfree_slock); 304 rv = sodopendfreel(so); 305 simple_unlock(&so_pendfree_slock); 306 splx(s); 307 308 return rv; 309 } 310 311 /* 312 * sodopendfreel: free mbufs on "pendfree" list. 313 * unlock and relock so_pendfree_slock when freeing mbufs. 314 * 315 * => called with so_pendfree_slock held. 316 * => called at splvm. 317 */ 318 319 static size_t 320 sodopendfreel(struct socket *so) 321 { 322 size_t rv = 0; 323 324 LOCK_ASSERT(simple_lock_held(&so_pendfree_slock)); 325 326 for (;;) { 327 struct mbuf *m; 328 struct mbuf *next; 329 330 m = so_pendfree; 331 if (m == NULL) 332 break; 333 so_pendfree = NULL; 334 simple_unlock(&so_pendfree_slock); 335 /* XXX splx */ 336 337 for (; m != NULL; m = next) { 338 next = m->m_next; 339 340 rv += m->m_ext.ext_size; 341 sodoloanfree((m->m_flags & M_EXT_PAGES) ? 342 m->m_ext.ext_pgs : NULL, m->m_ext.ext_buf, 343 m->m_ext.ext_size); 344 pool_cache_put(&mbpool_cache, m); 345 } 346 347 /* XXX splvm */ 348 simple_lock(&so_pendfree_slock); 349 } 350 351 return (rv); 352 } 353 354 void 355 soloanfree(struct mbuf *m, caddr_t buf, size_t size, void *arg) 356 { 357 int s; 358 359 if (m == NULL) { 360 361 /* 362 * called from MEXTREMOVE. 363 */ 364 365 sodoloanfree(NULL, buf, size); 366 return; 367 } 368 369 /* 370 * postpone freeing mbuf. 371 * 372 * we can't do it in interrupt context 373 * because we need to put kva back to kernel_map. 374 */ 375 376 s = splvm(); 377 simple_lock(&so_pendfree_slock); 378 m->m_next = so_pendfree; 379 so_pendfree = m; 380 if (sokvawaiters) 381 wakeup(&socurkva); 382 simple_unlock(&so_pendfree_slock); 383 splx(s); 384 } 385 386 static long 387 sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space) 388 { 389 struct iovec *iov = uio->uio_iov; 390 vaddr_t sva, eva; 391 vsize_t len; 392 vaddr_t lva, va; 393 int npgs, i, error; 394 395 if (uio->uio_segflg != UIO_USERSPACE) 396 return (0); 397 398 if (iov->iov_len < (size_t) space) 399 space = iov->iov_len; 400 if (space > SOCK_LOAN_CHUNK) 401 space = SOCK_LOAN_CHUNK; 402 403 eva = round_page((vaddr_t) iov->iov_base + space); 404 sva = trunc_page((vaddr_t) iov->iov_base); 405 len = eva - sva; 406 npgs = len >> PAGE_SHIFT; 407 408 /* XXX KDASSERT */ 409 KASSERT(npgs <= M_EXT_MAXPAGES); 410 KASSERT(uio->uio_lwp != NULL); 411 412 lva = sokvaalloc(len, so); 413 if (lva == 0) 414 return 0; 415 416 error = uvm_loan(&uio->uio_lwp->l_proc->p_vmspace->vm_map, sva, len, 417 m->m_ext.ext_pgs, UVM_LOAN_TOPAGE); 418 if (error) { 419 sokvafree(lva, len); 420 return (0); 421 } 422 423 for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE) 424 pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]), 425 VM_PROT_READ); 426 pmap_update(pmap_kernel()); 427 428 lva += (vaddr_t) iov->iov_base & PAGE_MASK; 429 430 MEXTADD(m, (caddr_t) lva, space, M_MBUF, soloanfree, so); 431 m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP; 432 433 uio->uio_resid -= space; 434 /* uio_offset not updated, not set/used for write(2) */ 435 uio->uio_iov->iov_base = (caddr_t) uio->uio_iov->iov_base + space; 436 uio->uio_iov->iov_len -= space; 437 if (uio->uio_iov->iov_len == 0) { 438 uio->uio_iov++; 439 uio->uio_iovcnt--; 440 } 441 442 return (space); 443 } 444 445 /* 446 * Socket operation routines. 447 * These routines are called by the routines in 448 * sys_socket.c or from a system process, and 449 * implement the semantics of socket operations by 450 * switching out to the protocol specific routines. 451 */ 452 /*ARGSUSED*/ 453 int 454 socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l) 455 { 456 const struct protosw *prp; 457 struct socket *so; 458 struct proc *p; 459 int error, s; 460 461 p = l->l_proc; 462 if (proto) 463 prp = pffindproto(dom, proto, type); 464 else 465 prp = pffindtype(dom, type); 466 if (prp == 0 || prp->pr_usrreq == 0) 467 return (EPROTONOSUPPORT); 468 if (prp->pr_type != type) 469 return (EPROTOTYPE); 470 s = splsoftnet(); 471 so = pool_get(&socket_pool, PR_WAITOK); 472 memset((caddr_t)so, 0, sizeof(*so)); 473 TAILQ_INIT(&so->so_q0); 474 TAILQ_INIT(&so->so_q); 475 so->so_type = type; 476 so->so_proto = prp; 477 so->so_send = sosend; 478 so->so_receive = soreceive; 479 #ifdef MBUFTRACE 480 so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner; 481 so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner; 482 so->so_mowner = &prp->pr_domain->dom_mowner; 483 #endif 484 if (p != 0) 485 so->so_uid = p->p_ucred->cr_uid; 486 else 487 so->so_uid = UID_MAX; 488 error = (*prp->pr_usrreq)(so, PRU_ATTACH, (struct mbuf *)0, 489 (struct mbuf *)(long)proto, (struct mbuf *)0, l); 490 if (error) { 491 so->so_state |= SS_NOFDREF; 492 sofree(so); 493 splx(s); 494 return (error); 495 } 496 splx(s); 497 *aso = so; 498 return (0); 499 } 500 501 int 502 sobind(struct socket *so, struct mbuf *nam, struct lwp *l) 503 { 504 int s, error; 505 506 s = splsoftnet(); 507 error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, (struct mbuf *)0, 508 nam, (struct mbuf *)0, l); 509 splx(s); 510 return (error); 511 } 512 513 int 514 solisten(struct socket *so, int backlog) 515 { 516 int s, error; 517 518 s = splsoftnet(); 519 error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, (struct mbuf *)0, 520 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 521 if (error) { 522 splx(s); 523 return (error); 524 } 525 if (TAILQ_EMPTY(&so->so_q)) 526 so->so_options |= SO_ACCEPTCONN; 527 if (backlog < 0) 528 backlog = 0; 529 so->so_qlimit = min(backlog, somaxconn); 530 splx(s); 531 return (0); 532 } 533 534 void 535 sofree(struct socket *so) 536 { 537 538 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) 539 return; 540 if (so->so_head) { 541 /* 542 * We must not decommission a socket that's on the accept(2) 543 * queue. If we do, then accept(2) may hang after select(2) 544 * indicated that the listening socket was ready. 545 */ 546 if (!soqremque(so, 0)) 547 return; 548 } 549 if (so->so_rcv.sb_hiwat) 550 (void)chgsbsize(so->so_uid, &so->so_rcv.sb_hiwat, 0, 551 RLIM_INFINITY); 552 if (so->so_snd.sb_hiwat) 553 (void)chgsbsize(so->so_uid, &so->so_snd.sb_hiwat, 0, 554 RLIM_INFINITY); 555 sbrelease(&so->so_snd, so); 556 sorflush(so); 557 pool_put(&socket_pool, so); 558 } 559 560 /* 561 * Close a socket on last file table reference removal. 562 * Initiate disconnect if connected. 563 * Free socket when disconnect complete. 564 */ 565 int 566 soclose(struct socket *so) 567 { 568 struct socket *so2; 569 int s, error; 570 571 error = 0; 572 s = splsoftnet(); /* conservative */ 573 if (so->so_options & SO_ACCEPTCONN) { 574 while ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) { 575 (void) soqremque(so2, 0); 576 (void) soabort(so2); 577 } 578 while ((so2 = TAILQ_FIRST(&so->so_q)) != 0) { 579 (void) soqremque(so2, 1); 580 (void) soabort(so2); 581 } 582 } 583 if (so->so_pcb == 0) 584 goto discard; 585 if (so->so_state & SS_ISCONNECTED) { 586 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 587 error = sodisconnect(so); 588 if (error) 589 goto drop; 590 } 591 if (so->so_options & SO_LINGER) { 592 if ((so->so_state & SS_ISDISCONNECTING) && 593 (so->so_state & SS_NBIO)) 594 goto drop; 595 while (so->so_state & SS_ISCONNECTED) { 596 error = tsleep((caddr_t)&so->so_timeo, 597 PSOCK | PCATCH, netcls, 598 so->so_linger * hz); 599 if (error) 600 break; 601 } 602 } 603 } 604 drop: 605 if (so->so_pcb) { 606 int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 607 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0, 608 (struct lwp *)0); 609 if (error == 0) 610 error = error2; 611 } 612 discard: 613 if (so->so_state & SS_NOFDREF) 614 panic("soclose: NOFDREF"); 615 so->so_state |= SS_NOFDREF; 616 sofree(so); 617 splx(s); 618 return (error); 619 } 620 621 /* 622 * Must be called at splsoftnet... 623 */ 624 int 625 soabort(struct socket *so) 626 { 627 628 return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, (struct mbuf *)0, 629 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 630 } 631 632 int 633 soaccept(struct socket *so, struct mbuf *nam) 634 { 635 int s, error; 636 637 error = 0; 638 s = splsoftnet(); 639 if ((so->so_state & SS_NOFDREF) == 0) 640 panic("soaccept: !NOFDREF"); 641 so->so_state &= ~SS_NOFDREF; 642 if ((so->so_state & SS_ISDISCONNECTED) == 0 || 643 (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0) 644 error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 645 (struct mbuf *)0, nam, (struct mbuf *)0, (struct lwp *)0); 646 else 647 error = ECONNABORTED; 648 649 splx(s); 650 return (error); 651 } 652 653 int 654 soconnect(struct socket *so, struct mbuf *nam, struct lwp *l) 655 { 656 int s, error; 657 658 if (so->so_options & SO_ACCEPTCONN) 659 return (EOPNOTSUPP); 660 s = splsoftnet(); 661 /* 662 * If protocol is connection-based, can only connect once. 663 * Otherwise, if connected, try to disconnect first. 664 * This allows user to disconnect by connecting to, e.g., 665 * a null address. 666 */ 667 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 668 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 669 (error = sodisconnect(so)))) 670 error = EISCONN; 671 else 672 error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 673 (struct mbuf *)0, nam, (struct mbuf *)0, l); 674 splx(s); 675 return (error); 676 } 677 678 int 679 soconnect2(struct socket *so1, struct socket *so2) 680 { 681 int s, error; 682 683 s = splsoftnet(); 684 error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, 685 (struct mbuf *)0, (struct mbuf *)so2, (struct mbuf *)0, 686 (struct lwp *)0); 687 splx(s); 688 return (error); 689 } 690 691 int 692 sodisconnect(struct socket *so) 693 { 694 int s, error; 695 696 s = splsoftnet(); 697 if ((so->so_state & SS_ISCONNECTED) == 0) { 698 error = ENOTCONN; 699 goto bad; 700 } 701 if (so->so_state & SS_ISDISCONNECTING) { 702 error = EALREADY; 703 goto bad; 704 } 705 error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 706 (struct mbuf *)0, (struct mbuf *)0, (struct mbuf *)0, 707 (struct lwp *)0); 708 bad: 709 splx(s); 710 sodopendfree(so); 711 return (error); 712 } 713 714 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 715 /* 716 * Send on a socket. 717 * If send must go all at once and message is larger than 718 * send buffering, then hard error. 719 * Lock against other senders. 720 * If must go all at once and not enough room now, then 721 * inform user that this would block and do nothing. 722 * Otherwise, if nonblocking, send as much as possible. 723 * The data to be sent is described by "uio" if nonzero, 724 * otherwise by the mbuf chain "top" (which must be null 725 * if uio is not). Data provided in mbuf chain must be small 726 * enough to send all at once. 727 * 728 * Returns nonzero on error, timeout or signal; callers 729 * must check for short counts if EINTR/ERESTART are returned. 730 * Data and control buffers are freed on return. 731 */ 732 int 733 sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top, 734 struct mbuf *control, int flags, struct lwp *l) 735 { 736 struct mbuf **mp, *m; 737 struct proc *p; 738 long space, len, resid, clen, mlen; 739 int error, s, dontroute, atomic; 740 741 p = l->l_proc; 742 sodopendfree(so); 743 744 clen = 0; 745 atomic = sosendallatonce(so) || top; 746 if (uio) 747 resid = uio->uio_resid; 748 else 749 resid = top->m_pkthdr.len; 750 /* 751 * In theory resid should be unsigned. 752 * However, space must be signed, as it might be less than 0 753 * if we over-committed, and we must use a signed comparison 754 * of space and resid. On the other hand, a negative resid 755 * causes us to loop sending 0-length segments to the protocol. 756 */ 757 if (resid < 0) { 758 error = EINVAL; 759 goto out; 760 } 761 dontroute = 762 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 763 (so->so_proto->pr_flags & PR_ATOMIC); 764 if (p) 765 p->p_stats->p_ru.ru_msgsnd++; 766 if (control) 767 clen = control->m_len; 768 #define snderr(errno) { error = errno; splx(s); goto release; } 769 770 restart: 771 if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0) 772 goto out; 773 do { 774 s = splsoftnet(); 775 if (so->so_state & SS_CANTSENDMORE) 776 snderr(EPIPE); 777 if (so->so_error) { 778 error = so->so_error; 779 so->so_error = 0; 780 splx(s); 781 goto release; 782 } 783 if ((so->so_state & SS_ISCONNECTED) == 0) { 784 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 785 if ((so->so_state & SS_ISCONFIRMING) == 0 && 786 !(resid == 0 && clen != 0)) 787 snderr(ENOTCONN); 788 } else if (addr == 0) 789 snderr(EDESTADDRREQ); 790 } 791 space = sbspace(&so->so_snd); 792 if (flags & MSG_OOB) 793 space += 1024; 794 if ((atomic && resid > so->so_snd.sb_hiwat) || 795 clen > so->so_snd.sb_hiwat) 796 snderr(EMSGSIZE); 797 if (space < resid + clen && 798 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 799 if (so->so_state & SS_NBIO) 800 snderr(EWOULDBLOCK); 801 sbunlock(&so->so_snd); 802 error = sbwait(&so->so_snd); 803 splx(s); 804 if (error) 805 goto out; 806 goto restart; 807 } 808 splx(s); 809 mp = ⊤ 810 space -= clen; 811 do { 812 if (uio == NULL) { 813 /* 814 * Data is prepackaged in "top". 815 */ 816 resid = 0; 817 if (flags & MSG_EOR) 818 top->m_flags |= M_EOR; 819 } else do { 820 if (top == 0) { 821 m = m_gethdr(M_WAIT, MT_DATA); 822 mlen = MHLEN; 823 m->m_pkthdr.len = 0; 824 m->m_pkthdr.rcvif = (struct ifnet *)0; 825 } else { 826 m = m_get(M_WAIT, MT_DATA); 827 mlen = MLEN; 828 } 829 MCLAIM(m, so->so_snd.sb_mowner); 830 if (use_sosend_loan && 831 uio->uio_iov->iov_len >= SOCK_LOAN_THRESH && 832 space >= SOCK_LOAN_THRESH && 833 (len = sosend_loan(so, uio, m, 834 space)) != 0) { 835 SOSEND_COUNTER_INCR(&sosend_loan_big); 836 space -= len; 837 goto have_data; 838 } 839 if (resid >= MINCLSIZE && space >= MCLBYTES) { 840 SOSEND_COUNTER_INCR(&sosend_copy_big); 841 m_clget(m, M_WAIT); 842 if ((m->m_flags & M_EXT) == 0) 843 goto nopages; 844 mlen = MCLBYTES; 845 if (atomic && top == 0) { 846 len = lmin(MCLBYTES - max_hdr, 847 resid); 848 m->m_data += max_hdr; 849 } else 850 len = lmin(MCLBYTES, resid); 851 space -= len; 852 } else { 853 nopages: 854 SOSEND_COUNTER_INCR(&sosend_copy_small); 855 len = lmin(lmin(mlen, resid), space); 856 space -= len; 857 /* 858 * For datagram protocols, leave room 859 * for protocol headers in first mbuf. 860 */ 861 if (atomic && top == 0 && len < mlen) 862 MH_ALIGN(m, len); 863 } 864 error = uiomove(mtod(m, caddr_t), (int)len, 865 uio); 866 have_data: 867 resid = uio->uio_resid; 868 m->m_len = len; 869 *mp = m; 870 top->m_pkthdr.len += len; 871 if (error) 872 goto release; 873 mp = &m->m_next; 874 if (resid <= 0) { 875 if (flags & MSG_EOR) 876 top->m_flags |= M_EOR; 877 break; 878 } 879 } while (space > 0 && atomic); 880 881 s = splsoftnet(); 882 883 if (so->so_state & SS_CANTSENDMORE) 884 snderr(EPIPE); 885 886 if (dontroute) 887 so->so_options |= SO_DONTROUTE; 888 if (resid > 0) 889 so->so_state |= SS_MORETOCOME; 890 error = (*so->so_proto->pr_usrreq)(so, 891 (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, 892 top, addr, control, curlwp); /* XXX */ 893 if (dontroute) 894 so->so_options &= ~SO_DONTROUTE; 895 if (resid > 0) 896 so->so_state &= ~SS_MORETOCOME; 897 splx(s); 898 899 clen = 0; 900 control = 0; 901 top = 0; 902 mp = ⊤ 903 if (error) 904 goto release; 905 } while (resid && space > 0); 906 } while (resid); 907 908 release: 909 sbunlock(&so->so_snd); 910 out: 911 if (top) 912 m_freem(top); 913 if (control) 914 m_freem(control); 915 return (error); 916 } 917 918 /* 919 * Implement receive operations on a socket. 920 * We depend on the way that records are added to the sockbuf 921 * by sbappend*. In particular, each record (mbufs linked through m_next) 922 * must begin with an address if the protocol so specifies, 923 * followed by an optional mbuf or mbufs containing ancillary data, 924 * and then zero or more mbufs of data. 925 * In order to avoid blocking network interrupts for the entire time here, 926 * we splx() while doing the actual copy to user space. 927 * Although the sockbuf is locked, new data may still be appended, 928 * and thus we must maintain consistency of the sockbuf during that time. 929 * 930 * The caller may receive the data as a single mbuf chain by supplying 931 * an mbuf **mp0 for use in returning the chain. The uio is then used 932 * only for the count in uio_resid. 933 */ 934 int 935 soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio, 936 struct mbuf **mp0, struct mbuf **controlp, int *flagsp) 937 { 938 struct lwp *l; 939 struct proc *p; 940 struct mbuf *m, **mp; 941 int flags, len, error, s, offset, moff, type, orig_resid; 942 const struct protosw *pr; 943 struct mbuf *nextrecord; 944 int mbuf_removed = 0; 945 946 pr = so->so_proto; 947 mp = mp0; 948 type = 0; 949 orig_resid = uio->uio_resid; 950 l = uio->uio_lwp; 951 p = l->l_proc; 952 953 if (paddr) 954 *paddr = 0; 955 if (controlp) 956 *controlp = 0; 957 if (flagsp) 958 flags = *flagsp &~ MSG_EOR; 959 else 960 flags = 0; 961 962 if ((flags & MSG_DONTWAIT) == 0) 963 sodopendfree(so); 964 965 if (flags & MSG_OOB) { 966 m = m_get(M_WAIT, MT_DATA); 967 error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m, 968 (struct mbuf *)(long)(flags & MSG_PEEK), 969 (struct mbuf *)0, l); 970 if (error) 971 goto bad; 972 do { 973 error = uiomove(mtod(m, caddr_t), 974 (int) min(uio->uio_resid, m->m_len), uio); 975 m = m_free(m); 976 } while (uio->uio_resid && error == 0 && m); 977 bad: 978 if (m) 979 m_freem(m); 980 return (error); 981 } 982 if (mp) 983 *mp = (struct mbuf *)0; 984 if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) 985 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 986 (struct mbuf *)0, (struct mbuf *)0, l); 987 988 restart: 989 if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) 990 return (error); 991 s = splsoftnet(); 992 993 m = so->so_rcv.sb_mb; 994 /* 995 * If we have less data than requested, block awaiting more 996 * (subject to any timeout) if: 997 * 1. the current count is less than the low water mark, 998 * 2. MSG_WAITALL is set, and it is possible to do the entire 999 * receive operation at once if we block (resid <= hiwat), or 1000 * 3. MSG_DONTWAIT is not set. 1001 * If MSG_WAITALL is set but resid is larger than the receive buffer, 1002 * we have to do the receive in sections, and thus risk returning 1003 * a short count if a timeout or signal occurs after we start. 1004 */ 1005 if (m == 0 || (((flags & MSG_DONTWAIT) == 0 && 1006 so->so_rcv.sb_cc < uio->uio_resid) && 1007 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 1008 ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && 1009 m->m_nextpkt == 0 && (pr->pr_flags & PR_ATOMIC) == 0)) { 1010 #ifdef DIAGNOSTIC 1011 if (m == 0 && so->so_rcv.sb_cc) 1012 panic("receive 1"); 1013 #endif 1014 if (so->so_error) { 1015 if (m) 1016 goto dontblock; 1017 error = so->so_error; 1018 if ((flags & MSG_PEEK) == 0) 1019 so->so_error = 0; 1020 goto release; 1021 } 1022 if (so->so_state & SS_CANTRCVMORE) { 1023 if (m) 1024 goto dontblock; 1025 else 1026 goto release; 1027 } 1028 for (; m; m = m->m_next) 1029 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 1030 m = so->so_rcv.sb_mb; 1031 goto dontblock; 1032 } 1033 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 1034 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 1035 error = ENOTCONN; 1036 goto release; 1037 } 1038 if (uio->uio_resid == 0) 1039 goto release; 1040 if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { 1041 error = EWOULDBLOCK; 1042 goto release; 1043 } 1044 SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1"); 1045 SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1"); 1046 sbunlock(&so->so_rcv); 1047 error = sbwait(&so->so_rcv); 1048 splx(s); 1049 if (error) 1050 return (error); 1051 goto restart; 1052 } 1053 dontblock: 1054 /* 1055 * On entry here, m points to the first record of the socket buffer. 1056 * While we process the initial mbufs containing address and control 1057 * info, we save a copy of m->m_nextpkt into nextrecord. 1058 */ 1059 if (p) 1060 p->p_stats->p_ru.ru_msgrcv++; 1061 KASSERT(m == so->so_rcv.sb_mb); 1062 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 1063 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 1064 nextrecord = m->m_nextpkt; 1065 if (pr->pr_flags & PR_ADDR) { 1066 #ifdef DIAGNOSTIC 1067 if (m->m_type != MT_SONAME) 1068 panic("receive 1a"); 1069 #endif 1070 orig_resid = 0; 1071 if (flags & MSG_PEEK) { 1072 if (paddr) 1073 *paddr = m_copy(m, 0, m->m_len); 1074 m = m->m_next; 1075 } else { 1076 sbfree(&so->so_rcv, m); 1077 mbuf_removed = 1; 1078 if (paddr) { 1079 *paddr = m; 1080 so->so_rcv.sb_mb = m->m_next; 1081 m->m_next = 0; 1082 m = so->so_rcv.sb_mb; 1083 } else { 1084 MFREE(m, so->so_rcv.sb_mb); 1085 m = so->so_rcv.sb_mb; 1086 } 1087 } 1088 } 1089 while (m && m->m_type == MT_CONTROL && error == 0) { 1090 if (flags & MSG_PEEK) { 1091 if (controlp) 1092 *controlp = m_copy(m, 0, m->m_len); 1093 m = m->m_next; 1094 } else { 1095 sbfree(&so->so_rcv, m); 1096 mbuf_removed = 1; 1097 if (controlp) { 1098 struct domain *dom = pr->pr_domain; 1099 if (dom->dom_externalize && p && 1100 mtod(m, struct cmsghdr *)->cmsg_type == 1101 SCM_RIGHTS) 1102 error = (*dom->dom_externalize)(m, l); 1103 *controlp = m; 1104 so->so_rcv.sb_mb = m->m_next; 1105 m->m_next = 0; 1106 m = so->so_rcv.sb_mb; 1107 } else { 1108 /* 1109 * Dispose of any SCM_RIGHTS message that went 1110 * through the read path rather than recv. 1111 */ 1112 if (pr->pr_domain->dom_dispose && 1113 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 1114 (*pr->pr_domain->dom_dispose)(m); 1115 MFREE(m, so->so_rcv.sb_mb); 1116 m = so->so_rcv.sb_mb; 1117 } 1118 } 1119 if (controlp) { 1120 orig_resid = 0; 1121 controlp = &(*controlp)->m_next; 1122 } 1123 } 1124 1125 /* 1126 * If m is non-NULL, we have some data to read. From now on, 1127 * make sure to keep sb_lastrecord consistent when working on 1128 * the last packet on the chain (nextrecord == NULL) and we 1129 * change m->m_nextpkt. 1130 */ 1131 if (m) { 1132 if ((flags & MSG_PEEK) == 0) { 1133 m->m_nextpkt = nextrecord; 1134 /* 1135 * If nextrecord == NULL (this is a single chain), 1136 * then sb_lastrecord may not be valid here if m 1137 * was changed earlier. 1138 */ 1139 if (nextrecord == NULL) { 1140 KASSERT(so->so_rcv.sb_mb == m); 1141 so->so_rcv.sb_lastrecord = m; 1142 } 1143 } 1144 type = m->m_type; 1145 if (type == MT_OOBDATA) 1146 flags |= MSG_OOB; 1147 } else { 1148 if ((flags & MSG_PEEK) == 0) { 1149 KASSERT(so->so_rcv.sb_mb == m); 1150 so->so_rcv.sb_mb = nextrecord; 1151 SB_EMPTY_FIXUP(&so->so_rcv); 1152 } 1153 } 1154 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 1155 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 1156 1157 moff = 0; 1158 offset = 0; 1159 while (m && uio->uio_resid > 0 && error == 0) { 1160 if (m->m_type == MT_OOBDATA) { 1161 if (type != MT_OOBDATA) 1162 break; 1163 } else if (type == MT_OOBDATA) 1164 break; 1165 #ifdef DIAGNOSTIC 1166 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 1167 panic("receive 3"); 1168 #endif 1169 so->so_state &= ~SS_RCVATMARK; 1170 len = uio->uio_resid; 1171 if (so->so_oobmark && len > so->so_oobmark - offset) 1172 len = so->so_oobmark - offset; 1173 if (len > m->m_len - moff) 1174 len = m->m_len - moff; 1175 /* 1176 * If mp is set, just pass back the mbufs. 1177 * Otherwise copy them out via the uio, then free. 1178 * Sockbuf must be consistent here (points to current mbuf, 1179 * it points to next record) when we drop priority; 1180 * we must note any additions to the sockbuf when we 1181 * block interrupts again. 1182 */ 1183 if (mp == 0) { 1184 SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove"); 1185 SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove"); 1186 splx(s); 1187 error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); 1188 s = splsoftnet(); 1189 if (error) { 1190 /* 1191 * If any part of the record has been removed 1192 * (such as the MT_SONAME mbuf, which will 1193 * happen when PR_ADDR, and thus also 1194 * PR_ATOMIC, is set), then drop the entire 1195 * record to maintain the atomicity of the 1196 * receive operation. 1197 * 1198 * This avoids a later panic("receive 1a") 1199 * when compiled with DIAGNOSTIC. 1200 */ 1201 if (m && mbuf_removed 1202 && (pr->pr_flags & PR_ATOMIC)) 1203 (void) sbdroprecord(&so->so_rcv); 1204 1205 goto release; 1206 } 1207 } else 1208 uio->uio_resid -= len; 1209 if (len == m->m_len - moff) { 1210 if (m->m_flags & M_EOR) 1211 flags |= MSG_EOR; 1212 if (flags & MSG_PEEK) { 1213 m = m->m_next; 1214 moff = 0; 1215 } else { 1216 nextrecord = m->m_nextpkt; 1217 sbfree(&so->so_rcv, m); 1218 if (mp) { 1219 *mp = m; 1220 mp = &m->m_next; 1221 so->so_rcv.sb_mb = m = m->m_next; 1222 *mp = (struct mbuf *)0; 1223 } else { 1224 MFREE(m, so->so_rcv.sb_mb); 1225 m = so->so_rcv.sb_mb; 1226 } 1227 /* 1228 * If m != NULL, we also know that 1229 * so->so_rcv.sb_mb != NULL. 1230 */ 1231 KASSERT(so->so_rcv.sb_mb == m); 1232 if (m) { 1233 m->m_nextpkt = nextrecord; 1234 if (nextrecord == NULL) 1235 so->so_rcv.sb_lastrecord = m; 1236 } else { 1237 so->so_rcv.sb_mb = nextrecord; 1238 SB_EMPTY_FIXUP(&so->so_rcv); 1239 } 1240 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 1241 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 1242 } 1243 } else { 1244 if (flags & MSG_PEEK) 1245 moff += len; 1246 else { 1247 if (mp) 1248 *mp = m_copym(m, 0, len, M_WAIT); 1249 m->m_data += len; 1250 m->m_len -= len; 1251 so->so_rcv.sb_cc -= len; 1252 } 1253 } 1254 if (so->so_oobmark) { 1255 if ((flags & MSG_PEEK) == 0) { 1256 so->so_oobmark -= len; 1257 if (so->so_oobmark == 0) { 1258 so->so_state |= SS_RCVATMARK; 1259 break; 1260 } 1261 } else { 1262 offset += len; 1263 if (offset == so->so_oobmark) 1264 break; 1265 } 1266 } 1267 if (flags & MSG_EOR) 1268 break; 1269 /* 1270 * If the MSG_WAITALL flag is set (for non-atomic socket), 1271 * we must not quit until "uio->uio_resid == 0" or an error 1272 * termination. If a signal/timeout occurs, return 1273 * with a short count but without error. 1274 * Keep sockbuf locked against other readers. 1275 */ 1276 while (flags & MSG_WAITALL && m == 0 && uio->uio_resid > 0 && 1277 !sosendallatonce(so) && !nextrecord) { 1278 if (so->so_error || so->so_state & SS_CANTRCVMORE) 1279 break; 1280 /* 1281 * If we are peeking and the socket receive buffer is 1282 * full, stop since we can't get more data to peek at. 1283 */ 1284 if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0) 1285 break; 1286 /* 1287 * If we've drained the socket buffer, tell the 1288 * protocol in case it needs to do something to 1289 * get it filled again. 1290 */ 1291 if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb) 1292 (*pr->pr_usrreq)(so, PRU_RCVD, 1293 (struct mbuf *)0, 1294 (struct mbuf *)(long)flags, 1295 (struct mbuf *)0, l); 1296 SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2"); 1297 SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2"); 1298 error = sbwait(&so->so_rcv); 1299 if (error) { 1300 sbunlock(&so->so_rcv); 1301 splx(s); 1302 return (0); 1303 } 1304 if ((m = so->so_rcv.sb_mb) != NULL) 1305 nextrecord = m->m_nextpkt; 1306 } 1307 } 1308 1309 if (m && pr->pr_flags & PR_ATOMIC) { 1310 flags |= MSG_TRUNC; 1311 if ((flags & MSG_PEEK) == 0) 1312 (void) sbdroprecord(&so->so_rcv); 1313 } 1314 if ((flags & MSG_PEEK) == 0) { 1315 if (m == 0) { 1316 /* 1317 * First part is an inline SB_EMPTY_FIXUP(). Second 1318 * part makes sure sb_lastrecord is up-to-date if 1319 * there is still data in the socket buffer. 1320 */ 1321 so->so_rcv.sb_mb = nextrecord; 1322 if (so->so_rcv.sb_mb == NULL) { 1323 so->so_rcv.sb_mbtail = NULL; 1324 so->so_rcv.sb_lastrecord = NULL; 1325 } else if (nextrecord->m_nextpkt == NULL) 1326 so->so_rcv.sb_lastrecord = nextrecord; 1327 } 1328 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 1329 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 1330 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1331 (*pr->pr_usrreq)(so, PRU_RCVD, (struct mbuf *)0, 1332 (struct mbuf *)(long)flags, (struct mbuf *)0, l); 1333 } 1334 if (orig_resid == uio->uio_resid && orig_resid && 1335 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1336 sbunlock(&so->so_rcv); 1337 splx(s); 1338 goto restart; 1339 } 1340 1341 if (flagsp) 1342 *flagsp |= flags; 1343 release: 1344 sbunlock(&so->so_rcv); 1345 splx(s); 1346 return (error); 1347 } 1348 1349 int 1350 soshutdown(struct socket *so, int how) 1351 { 1352 const struct protosw *pr; 1353 1354 pr = so->so_proto; 1355 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1356 return (EINVAL); 1357 1358 if (how == SHUT_RD || how == SHUT_RDWR) 1359 sorflush(so); 1360 if (how == SHUT_WR || how == SHUT_RDWR) 1361 return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, (struct mbuf *)0, 1362 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1363 return (0); 1364 } 1365 1366 void 1367 sorflush(struct socket *so) 1368 { 1369 struct sockbuf *sb, asb; 1370 const struct protosw *pr; 1371 int s; 1372 1373 sb = &so->so_rcv; 1374 pr = so->so_proto; 1375 sb->sb_flags |= SB_NOINTR; 1376 (void) sblock(sb, M_WAITOK); 1377 s = splnet(); 1378 socantrcvmore(so); 1379 sbunlock(sb); 1380 asb = *sb; 1381 /* 1382 * Clear most of the sockbuf structure, but leave some of the 1383 * fields valid. 1384 */ 1385 memset(&sb->sb_startzero, 0, 1386 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); 1387 splx(s); 1388 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) 1389 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1390 sbrelease(&asb, so); 1391 } 1392 1393 int 1394 sosetopt(struct socket *so, int level, int optname, struct mbuf *m0) 1395 { 1396 int error; 1397 struct mbuf *m; 1398 1399 error = 0; 1400 m = m0; 1401 if (level != SOL_SOCKET) { 1402 if (so->so_proto && so->so_proto->pr_ctloutput) 1403 return ((*so->so_proto->pr_ctloutput) 1404 (PRCO_SETOPT, so, level, optname, &m0)); 1405 error = ENOPROTOOPT; 1406 } else { 1407 switch (optname) { 1408 1409 case SO_LINGER: 1410 if (m == NULL || m->m_len != sizeof(struct linger)) { 1411 error = EINVAL; 1412 goto bad; 1413 } 1414 so->so_linger = mtod(m, struct linger *)->l_linger; 1415 /* fall thru... */ 1416 1417 case SO_DEBUG: 1418 case SO_KEEPALIVE: 1419 case SO_DONTROUTE: 1420 case SO_USELOOPBACK: 1421 case SO_BROADCAST: 1422 case SO_REUSEADDR: 1423 case SO_REUSEPORT: 1424 case SO_OOBINLINE: 1425 case SO_TIMESTAMP: 1426 if (m == NULL || m->m_len < sizeof(int)) { 1427 error = EINVAL; 1428 goto bad; 1429 } 1430 if (*mtod(m, int *)) 1431 so->so_options |= optname; 1432 else 1433 so->so_options &= ~optname; 1434 break; 1435 1436 case SO_SNDBUF: 1437 case SO_RCVBUF: 1438 case SO_SNDLOWAT: 1439 case SO_RCVLOWAT: 1440 { 1441 int optval; 1442 1443 if (m == NULL || m->m_len < sizeof(int)) { 1444 error = EINVAL; 1445 goto bad; 1446 } 1447 1448 /* 1449 * Values < 1 make no sense for any of these 1450 * options, so disallow them. 1451 */ 1452 optval = *mtod(m, int *); 1453 if (optval < 1) { 1454 error = EINVAL; 1455 goto bad; 1456 } 1457 1458 switch (optname) { 1459 1460 case SO_SNDBUF: 1461 case SO_RCVBUF: 1462 if (sbreserve(optname == SO_SNDBUF ? 1463 &so->so_snd : &so->so_rcv, 1464 (u_long) optval, so) == 0) { 1465 error = ENOBUFS; 1466 goto bad; 1467 } 1468 break; 1469 1470 /* 1471 * Make sure the low-water is never greater than 1472 * the high-water. 1473 */ 1474 case SO_SNDLOWAT: 1475 so->so_snd.sb_lowat = 1476 (optval > so->so_snd.sb_hiwat) ? 1477 so->so_snd.sb_hiwat : optval; 1478 break; 1479 case SO_RCVLOWAT: 1480 so->so_rcv.sb_lowat = 1481 (optval > so->so_rcv.sb_hiwat) ? 1482 so->so_rcv.sb_hiwat : optval; 1483 break; 1484 } 1485 break; 1486 } 1487 1488 case SO_SNDTIMEO: 1489 case SO_RCVTIMEO: 1490 { 1491 struct timeval *tv; 1492 int val; 1493 1494 if (m == NULL || m->m_len < sizeof(*tv)) { 1495 error = EINVAL; 1496 goto bad; 1497 } 1498 tv = mtod(m, struct timeval *); 1499 if (tv->tv_sec > (INT_MAX - tv->tv_usec / tick) / hz) { 1500 error = EDOM; 1501 goto bad; 1502 } 1503 val = tv->tv_sec * hz + tv->tv_usec / tick; 1504 if (val == 0 && tv->tv_usec != 0) 1505 val = 1; 1506 1507 switch (optname) { 1508 1509 case SO_SNDTIMEO: 1510 so->so_snd.sb_timeo = val; 1511 break; 1512 case SO_RCVTIMEO: 1513 so->so_rcv.sb_timeo = val; 1514 break; 1515 } 1516 break; 1517 } 1518 1519 default: 1520 error = ENOPROTOOPT; 1521 break; 1522 } 1523 if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { 1524 (void) ((*so->so_proto->pr_ctloutput) 1525 (PRCO_SETOPT, so, level, optname, &m0)); 1526 m = NULL; /* freed by protocol */ 1527 } 1528 } 1529 bad: 1530 if (m) 1531 (void) m_free(m); 1532 return (error); 1533 } 1534 1535 int 1536 sogetopt(struct socket *so, int level, int optname, struct mbuf **mp) 1537 { 1538 struct mbuf *m; 1539 1540 if (level != SOL_SOCKET) { 1541 if (so->so_proto && so->so_proto->pr_ctloutput) { 1542 return ((*so->so_proto->pr_ctloutput) 1543 (PRCO_GETOPT, so, level, optname, mp)); 1544 } else 1545 return (ENOPROTOOPT); 1546 } else { 1547 m = m_get(M_WAIT, MT_SOOPTS); 1548 m->m_len = sizeof(int); 1549 1550 switch (optname) { 1551 1552 case SO_LINGER: 1553 m->m_len = sizeof(struct linger); 1554 mtod(m, struct linger *)->l_onoff = 1555 so->so_options & SO_LINGER; 1556 mtod(m, struct linger *)->l_linger = so->so_linger; 1557 break; 1558 1559 case SO_USELOOPBACK: 1560 case SO_DONTROUTE: 1561 case SO_DEBUG: 1562 case SO_KEEPALIVE: 1563 case SO_REUSEADDR: 1564 case SO_REUSEPORT: 1565 case SO_BROADCAST: 1566 case SO_OOBINLINE: 1567 case SO_TIMESTAMP: 1568 *mtod(m, int *) = so->so_options & optname; 1569 break; 1570 1571 case SO_TYPE: 1572 *mtod(m, int *) = so->so_type; 1573 break; 1574 1575 case SO_ERROR: 1576 *mtod(m, int *) = so->so_error; 1577 so->so_error = 0; 1578 break; 1579 1580 case SO_SNDBUF: 1581 *mtod(m, int *) = so->so_snd.sb_hiwat; 1582 break; 1583 1584 case SO_RCVBUF: 1585 *mtod(m, int *) = so->so_rcv.sb_hiwat; 1586 break; 1587 1588 case SO_SNDLOWAT: 1589 *mtod(m, int *) = so->so_snd.sb_lowat; 1590 break; 1591 1592 case SO_RCVLOWAT: 1593 *mtod(m, int *) = so->so_rcv.sb_lowat; 1594 break; 1595 1596 case SO_SNDTIMEO: 1597 case SO_RCVTIMEO: 1598 { 1599 int val = (optname == SO_SNDTIMEO ? 1600 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1601 1602 m->m_len = sizeof(struct timeval); 1603 mtod(m, struct timeval *)->tv_sec = val / hz; 1604 mtod(m, struct timeval *)->tv_usec = 1605 (val % hz) * tick; 1606 break; 1607 } 1608 1609 default: 1610 (void)m_free(m); 1611 return (ENOPROTOOPT); 1612 } 1613 *mp = m; 1614 return (0); 1615 } 1616 } 1617 1618 void 1619 sohasoutofband(struct socket *so) 1620 { 1621 fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so); 1622 selwakeup(&so->so_rcv.sb_sel); 1623 } 1624 1625 static void 1626 filt_sordetach(struct knote *kn) 1627 { 1628 struct socket *so; 1629 1630 so = (struct socket *)kn->kn_fp->f_data; 1631 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); 1632 if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) 1633 so->so_rcv.sb_flags &= ~SB_KNOTE; 1634 } 1635 1636 /*ARGSUSED*/ 1637 static int 1638 filt_soread(struct knote *kn, long hint) 1639 { 1640 struct socket *so; 1641 1642 so = (struct socket *)kn->kn_fp->f_data; 1643 kn->kn_data = so->so_rcv.sb_cc; 1644 if (so->so_state & SS_CANTRCVMORE) { 1645 kn->kn_flags |= EV_EOF; 1646 kn->kn_fflags = so->so_error; 1647 return (1); 1648 } 1649 if (so->so_error) /* temporary udp error */ 1650 return (1); 1651 if (kn->kn_sfflags & NOTE_LOWAT) 1652 return (kn->kn_data >= kn->kn_sdata); 1653 return (kn->kn_data >= so->so_rcv.sb_lowat); 1654 } 1655 1656 static void 1657 filt_sowdetach(struct knote *kn) 1658 { 1659 struct socket *so; 1660 1661 so = (struct socket *)kn->kn_fp->f_data; 1662 SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); 1663 if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) 1664 so->so_snd.sb_flags &= ~SB_KNOTE; 1665 } 1666 1667 /*ARGSUSED*/ 1668 static int 1669 filt_sowrite(struct knote *kn, long hint) 1670 { 1671 struct socket *so; 1672 1673 so = (struct socket *)kn->kn_fp->f_data; 1674 kn->kn_data = sbspace(&so->so_snd); 1675 if (so->so_state & SS_CANTSENDMORE) { 1676 kn->kn_flags |= EV_EOF; 1677 kn->kn_fflags = so->so_error; 1678 return (1); 1679 } 1680 if (so->so_error) /* temporary udp error */ 1681 return (1); 1682 if (((so->so_state & SS_ISCONNECTED) == 0) && 1683 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 1684 return (0); 1685 if (kn->kn_sfflags & NOTE_LOWAT) 1686 return (kn->kn_data >= kn->kn_sdata); 1687 return (kn->kn_data >= so->so_snd.sb_lowat); 1688 } 1689 1690 /*ARGSUSED*/ 1691 static int 1692 filt_solisten(struct knote *kn, long hint) 1693 { 1694 struct socket *so; 1695 1696 so = (struct socket *)kn->kn_fp->f_data; 1697 1698 /* 1699 * Set kn_data to number of incoming connections, not 1700 * counting partial (incomplete) connections. 1701 */ 1702 kn->kn_data = so->so_qlen; 1703 return (kn->kn_data > 0); 1704 } 1705 1706 static const struct filterops solisten_filtops = 1707 { 1, NULL, filt_sordetach, filt_solisten }; 1708 static const struct filterops soread_filtops = 1709 { 1, NULL, filt_sordetach, filt_soread }; 1710 static const struct filterops sowrite_filtops = 1711 { 1, NULL, filt_sowdetach, filt_sowrite }; 1712 1713 int 1714 soo_kqfilter(struct file *fp, struct knote *kn) 1715 { 1716 struct socket *so; 1717 struct sockbuf *sb; 1718 1719 so = (struct socket *)kn->kn_fp->f_data; 1720 switch (kn->kn_filter) { 1721 case EVFILT_READ: 1722 if (so->so_options & SO_ACCEPTCONN) 1723 kn->kn_fop = &solisten_filtops; 1724 else 1725 kn->kn_fop = &soread_filtops; 1726 sb = &so->so_rcv; 1727 break; 1728 case EVFILT_WRITE: 1729 kn->kn_fop = &sowrite_filtops; 1730 sb = &so->so_snd; 1731 break; 1732 default: 1733 return (1); 1734 } 1735 SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext); 1736 sb->sb_flags |= SB_KNOTE; 1737 return (0); 1738 } 1739 1740 #include <sys/sysctl.h> 1741 1742 static int sysctl_kern_somaxkva(SYSCTLFN_PROTO); 1743 1744 /* 1745 * sysctl helper routine for kern.somaxkva. ensures that the given 1746 * value is not too small. 1747 * (XXX should we maybe make sure it's not too large as well?) 1748 */ 1749 static int 1750 sysctl_kern_somaxkva(SYSCTLFN_ARGS) 1751 { 1752 int error, new_somaxkva; 1753 struct sysctlnode node; 1754 int s; 1755 1756 new_somaxkva = somaxkva; 1757 node = *rnode; 1758 node.sysctl_data = &new_somaxkva; 1759 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1760 if (error || newp == NULL) 1761 return (error); 1762 1763 if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */ 1764 return (EINVAL); 1765 1766 s = splvm(); 1767 simple_lock(&so_pendfree_slock); 1768 somaxkva = new_somaxkva; 1769 wakeup(&socurkva); 1770 simple_unlock(&so_pendfree_slock); 1771 splx(s); 1772 1773 return (error); 1774 } 1775 1776 SYSCTL_SETUP(sysctl_kern_somaxkva_setup, "sysctl kern.somaxkva setup") 1777 { 1778 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT, 1781 CTLTYPE_NODE, "kern", NULL, 1782 NULL, 0, NULL, 0, 1783 CTL_KERN, CTL_EOL); 1784 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1787 CTLTYPE_INT, "somaxkva", 1788 SYSCTL_DESCR("Maximum amount of kernel memory to be " 1789 "used for socket buffers"), 1790 sysctl_kern_somaxkva, 0, NULL, 0, 1791 CTL_KERN, KERN_SOMAXKVA, CTL_EOL); 1792 } 1793
Indexes created Sat Sep 20 22:09:52 GMT 2025