uipc_socket.c revision 1.281.2.3
1 /* $NetBSD: uipc_socket.c,v 1.281.2.3 2020/09/22 18:39:01 martin Exp $ */ 2 3 /* 4 * Copyright (c) 2002, 2007, 2008, 2009 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, and by Andrew Doran. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 2004 The FreeBSD Foundation 34 * Copyright (c) 2004 Robert Watson 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 8.6 (Berkeley) 5/2/95 63 */ 64 65 /* 66 * Socket operation routines. 67 * 68 * These routines are called by the routines in sys_socket.c or from a 69 * system process, and implement the semantics of socket operations by 70 * switching out to the protocol specific routines. 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.281.2.3 2020/09/22 18:39:01 martin Exp $"); 75 76 #ifdef _KERNEL_OPT 77 #include "opt_compat_netbsd.h" 78 #include "opt_sock_counters.h" 79 #include "opt_sosend_loan.h" 80 #include "opt_mbuftrace.h" 81 #include "opt_somaxkva.h" 82 #include "opt_multiprocessor.h" /* XXX */ 83 #include "opt_sctp.h" 84 #endif 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/proc.h> 89 #include <sys/file.h> 90 #include <sys/filedesc.h> 91 #include <sys/kmem.h> 92 #include <sys/mbuf.h> 93 #include <sys/domain.h> 94 #include <sys/kernel.h> 95 #include <sys/protosw.h> 96 #include <sys/socket.h> 97 #include <sys/socketvar.h> 98 #include <sys/signalvar.h> 99 #include <sys/resourcevar.h> 100 #include <sys/uidinfo.h> 101 #include <sys/event.h> 102 #include <sys/poll.h> 103 #include <sys/kauth.h> 104 #include <sys/mutex.h> 105 #include <sys/condvar.h> 106 #include <sys/kthread.h> 107 #include <sys/compat_stub.h> 108 109 #include <compat/sys/time.h> 110 #include <compat/sys/socket.h> 111 112 #include <uvm/uvm_extern.h> 113 #include <uvm/uvm_loan.h> 114 #include <uvm/uvm_page.h> 115 116 #ifdef SCTP 117 #include <netinet/sctp_route.h> 118 #endif 119 120 MALLOC_DEFINE(M_SONAME, "soname", "socket name"); 121 122 extern const struct fileops socketops; 123 124 static int sooptions; 125 extern int somaxconn; /* patchable (XXX sysctl) */ 126 int somaxconn = SOMAXCONN; 127 kmutex_t *softnet_lock; 128 129 #ifdef SOSEND_COUNTERS 130 #include <sys/device.h> 131 132 static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 133 NULL, "sosend", "loan big"); 134 static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 135 NULL, "sosend", "copy big"); 136 static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 137 NULL, "sosend", "copy small"); 138 static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 139 NULL, "sosend", "kva limit"); 140 141 #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++ 142 143 EVCNT_ATTACH_STATIC(sosend_loan_big); 144 EVCNT_ATTACH_STATIC(sosend_copy_big); 145 EVCNT_ATTACH_STATIC(sosend_copy_small); 146 EVCNT_ATTACH_STATIC(sosend_kvalimit); 147 #else 148 149 #define SOSEND_COUNTER_INCR(ev) /* nothing */ 150 151 #endif /* SOSEND_COUNTERS */ 152 153 #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR) 154 int sock_loan_thresh = -1; 155 #else 156 int sock_loan_thresh = 4096; 157 #endif 158 159 static kmutex_t so_pendfree_lock; 160 static struct mbuf *so_pendfree = NULL; 161 162 #ifndef SOMAXKVA 163 #define SOMAXKVA (16 * 1024 * 1024) 164 #endif 165 int somaxkva = SOMAXKVA; 166 static int socurkva; 167 static kcondvar_t socurkva_cv; 168 169 static kauth_listener_t socket_listener; 170 171 #define SOCK_LOAN_CHUNK 65536 172 173 static void sopendfree_thread(void *); 174 static kcondvar_t pendfree_thread_cv; 175 static lwp_t *sopendfree_lwp; 176 177 static void sysctl_kern_socket_setup(void); 178 static struct sysctllog *socket_sysctllog; 179 180 static vsize_t 181 sokvareserve(struct socket *so, vsize_t len) 182 { 183 int error; 184 185 mutex_enter(&so_pendfree_lock); 186 while (socurkva + len > somaxkva) { 187 SOSEND_COUNTER_INCR(&sosend_kvalimit); 188 error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock); 189 if (error) { 190 len = 0; 191 break; 192 } 193 } 194 socurkva += len; 195 mutex_exit(&so_pendfree_lock); 196 return len; 197 } 198 199 static void 200 sokvaunreserve(vsize_t len) 201 { 202 203 mutex_enter(&so_pendfree_lock); 204 socurkva -= len; 205 cv_broadcast(&socurkva_cv); 206 mutex_exit(&so_pendfree_lock); 207 } 208 209 /* 210 * sokvaalloc: allocate kva for loan. 211 */ 212 vaddr_t 213 sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so) 214 { 215 vaddr_t lva; 216 217 if (sokvareserve(so, len) == 0) 218 return 0; 219 220 lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask, 221 UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA); 222 if (lva == 0) { 223 sokvaunreserve(len); 224 return 0; 225 } 226 227 return lva; 228 } 229 230 /* 231 * sokvafree: free kva for loan. 232 */ 233 void 234 sokvafree(vaddr_t sva, vsize_t len) 235 { 236 237 uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY); 238 sokvaunreserve(len); 239 } 240 241 static void 242 sodoloanfree(struct vm_page **pgs, void *buf, size_t size) 243 { 244 vaddr_t sva, eva; 245 vsize_t len; 246 int npgs; 247 248 KASSERT(pgs != NULL); 249 250 eva = round_page((vaddr_t) buf + size); 251 sva = trunc_page((vaddr_t) buf); 252 len = eva - sva; 253 npgs = len >> PAGE_SHIFT; 254 255 pmap_kremove(sva, len); 256 pmap_update(pmap_kernel()); 257 uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE); 258 sokvafree(sva, len); 259 } 260 261 /* 262 * sopendfree_thread: free mbufs on "pendfree" list. Unlock and relock 263 * so_pendfree_lock when freeing mbufs. 264 */ 265 static void 266 sopendfree_thread(void *v) 267 { 268 struct mbuf *m, *next; 269 size_t rv; 270 271 mutex_enter(&so_pendfree_lock); 272 273 for (;;) { 274 rv = 0; 275 while (so_pendfree != NULL) { 276 m = so_pendfree; 277 so_pendfree = NULL; 278 mutex_exit(&so_pendfree_lock); 279 280 for (; m != NULL; m = next) { 281 next = m->m_next; 282 KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 283 0); 284 KASSERT(m->m_ext.ext_refcnt == 0); 285 286 rv += m->m_ext.ext_size; 287 sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf, 288 m->m_ext.ext_size); 289 pool_cache_put(mb_cache, m); 290 } 291 292 mutex_enter(&so_pendfree_lock); 293 } 294 if (rv) 295 cv_broadcast(&socurkva_cv); 296 cv_wait(&pendfree_thread_cv, &so_pendfree_lock); 297 } 298 panic("sopendfree_thread"); 299 /* NOTREACHED */ 300 } 301 302 void 303 soloanfree(struct mbuf *m, void *buf, size_t size, void *arg) 304 { 305 306 KASSERT(m != NULL); 307 308 /* 309 * postpone freeing mbuf. 310 * 311 * we can't do it in interrupt context 312 * because we need to put kva back to kernel_map. 313 */ 314 315 mutex_enter(&so_pendfree_lock); 316 m->m_next = so_pendfree; 317 so_pendfree = m; 318 cv_signal(&pendfree_thread_cv); 319 mutex_exit(&so_pendfree_lock); 320 } 321 322 static long 323 sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space) 324 { 325 struct iovec *iov = uio->uio_iov; 326 vaddr_t sva, eva; 327 vsize_t len; 328 vaddr_t lva; 329 int npgs, error; 330 vaddr_t va; 331 int i; 332 333 if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace)) 334 return 0; 335 336 if (iov->iov_len < (size_t) space) 337 space = iov->iov_len; 338 if (space > SOCK_LOAN_CHUNK) 339 space = SOCK_LOAN_CHUNK; 340 341 eva = round_page((vaddr_t) iov->iov_base + space); 342 sva = trunc_page((vaddr_t) iov->iov_base); 343 len = eva - sva; 344 npgs = len >> PAGE_SHIFT; 345 346 KASSERT(npgs <= M_EXT_MAXPAGES); 347 348 lva = sokvaalloc(sva, len, so); 349 if (lva == 0) 350 return 0; 351 352 error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len, 353 m->m_ext.ext_pgs, UVM_LOAN_TOPAGE); 354 if (error) { 355 sokvafree(lva, len); 356 return 0; 357 } 358 359 for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE) 360 pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]), 361 VM_PROT_READ, 0); 362 pmap_update(pmap_kernel()); 363 364 lva += (vaddr_t) iov->iov_base & PAGE_MASK; 365 366 MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so); 367 m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP; 368 369 uio->uio_resid -= space; 370 /* uio_offset not updated, not set/used for write(2) */ 371 uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space; 372 uio->uio_iov->iov_len -= space; 373 if (uio->uio_iov->iov_len == 0) { 374 uio->uio_iov++; 375 uio->uio_iovcnt--; 376 } 377 378 return space; 379 } 380 381 static int 382 socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 383 void *arg0, void *arg1, void *arg2, void *arg3) 384 { 385 int result; 386 enum kauth_network_req req; 387 388 result = KAUTH_RESULT_DEFER; 389 req = (enum kauth_network_req)arg0; 390 391 if ((action != KAUTH_NETWORK_SOCKET) && 392 (action != KAUTH_NETWORK_BIND)) 393 return result; 394 395 switch (req) { 396 case KAUTH_REQ_NETWORK_BIND_PORT: 397 result = KAUTH_RESULT_ALLOW; 398 break; 399 400 case KAUTH_REQ_NETWORK_SOCKET_DROP: { 401 /* Normal users can only drop their own connections. */ 402 struct socket *so = (struct socket *)arg1; 403 404 if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0) 405 result = KAUTH_RESULT_ALLOW; 406 407 break; 408 } 409 410 case KAUTH_REQ_NETWORK_SOCKET_OPEN: 411 /* We allow "raw" routing/bluetooth sockets to anyone. */ 412 switch ((u_long)arg1) { 413 case PF_ROUTE: 414 case PF_OROUTE: 415 case PF_BLUETOOTH: 416 case PF_CAN: 417 result = KAUTH_RESULT_ALLOW; 418 break; 419 default: 420 /* Privileged, let secmodel handle this. */ 421 if ((u_long)arg2 == SOCK_RAW) 422 break; 423 result = KAUTH_RESULT_ALLOW; 424 break; 425 } 426 break; 427 428 case KAUTH_REQ_NETWORK_SOCKET_CANSEE: 429 result = KAUTH_RESULT_ALLOW; 430 431 break; 432 433 default: 434 break; 435 } 436 437 return result; 438 } 439 440 void 441 soinit(void) 442 { 443 444 sysctl_kern_socket_setup(); 445 446 #ifdef SCTP 447 /* Update the SCTP function hooks if necessary*/ 448 449 vec_sctp_add_ip_address = sctp_add_ip_address; 450 vec_sctp_delete_ip_address = sctp_delete_ip_address; 451 #endif 452 453 mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM); 454 softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 455 cv_init(&socurkva_cv, "sokva"); 456 cv_init(&pendfree_thread_cv, "sopendfr"); 457 soinit2(); 458 459 /* Set the initial adjusted socket buffer size. */ 460 if (sb_max_set(sb_max)) 461 panic("bad initial sb_max value: %lu", sb_max); 462 463 socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 464 socket_listener_cb, NULL); 465 } 466 467 void 468 soinit1(void) 469 { 470 int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, 471 sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree"); 472 if (error) 473 panic("soinit1 %d", error); 474 } 475 476 /* 477 * socreate: create a new socket of the specified type and the protocol. 478 * 479 * => Caller may specify another socket for lock sharing (must not be held). 480 * => Returns the new socket without lock held. 481 */ 482 int 483 socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l, 484 struct socket *lockso) 485 { 486 const struct protosw *prp; 487 struct socket *so; 488 uid_t uid; 489 int error; 490 kmutex_t *lock; 491 492 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET, 493 KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type), 494 KAUTH_ARG(proto)); 495 if (error != 0) 496 return error; 497 498 if (proto) 499 prp = pffindproto(dom, proto, type); 500 else 501 prp = pffindtype(dom, type); 502 if (prp == NULL) { 503 /* no support for domain */ 504 if (pffinddomain(dom) == 0) 505 return EAFNOSUPPORT; 506 /* no support for socket type */ 507 if (proto == 0 && type != 0) 508 return EPROTOTYPE; 509 return EPROTONOSUPPORT; 510 } 511 if (prp->pr_usrreqs == NULL) 512 return EPROTONOSUPPORT; 513 if (prp->pr_type != type) 514 return EPROTOTYPE; 515 516 so = soget(true); 517 so->so_type = type; 518 so->so_proto = prp; 519 so->so_send = sosend; 520 so->so_receive = soreceive; 521 so->so_options = sooptions; 522 #ifdef MBUFTRACE 523 so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner; 524 so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner; 525 so->so_mowner = &prp->pr_domain->dom_mowner; 526 #endif 527 uid = kauth_cred_geteuid(l->l_cred); 528 so->so_uidinfo = uid_find(uid); 529 so->so_egid = kauth_cred_getegid(l->l_cred); 530 so->so_cpid = l->l_proc->p_pid; 531 532 /* 533 * Lock assigned and taken during PCB attach, unless we share 534 * the lock with another socket, e.g. socketpair(2) case. 535 */ 536 if (lockso) { 537 lock = lockso->so_lock; 538 so->so_lock = lock; 539 mutex_obj_hold(lock); 540 mutex_enter(lock); 541 } 542 543 /* Attach the PCB (returns with the socket lock held). */ 544 error = (*prp->pr_usrreqs->pr_attach)(so, proto); 545 KASSERT(solocked(so)); 546 547 if (error) { 548 KASSERT(so->so_pcb == NULL); 549 so->so_state |= SS_NOFDREF; 550 sofree(so); 551 return error; 552 } 553 so->so_cred = kauth_cred_dup(l->l_cred); 554 sounlock(so); 555 556 *aso = so; 557 return 0; 558 } 559 560 /* 561 * fsocreate: create a socket and a file descriptor associated with it. 562 * 563 * => On success, write file descriptor to fdout and return zero. 564 * => On failure, return non-zero; *fdout will be undefined. 565 */ 566 int 567 fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout) 568 { 569 lwp_t *l = curlwp; 570 int error, fd, flags; 571 struct socket *so; 572 struct file *fp; 573 574 if ((error = fd_allocfile(&fp, &fd)) != 0) { 575 return error; 576 } 577 flags = type & SOCK_FLAGS_MASK; 578 fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0); 579 fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)| 580 ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0); 581 fp->f_type = DTYPE_SOCKET; 582 fp->f_ops = &socketops; 583 584 type &= ~SOCK_FLAGS_MASK; 585 error = socreate(domain, &so, type, proto, l, NULL); 586 if (error) { 587 fd_abort(curproc, fp, fd); 588 return error; 589 } 590 if (flags & SOCK_NONBLOCK) { 591 so->so_state |= SS_NBIO; 592 } 593 fp->f_socket = so; 594 fd_affix(curproc, fp, fd); 595 596 if (sop != NULL) { 597 *sop = so; 598 } 599 *fdout = fd; 600 return error; 601 } 602 603 int 604 sofamily(const struct socket *so) 605 { 606 const struct protosw *pr; 607 const struct domain *dom; 608 609 if ((pr = so->so_proto) == NULL) 610 return AF_UNSPEC; 611 if ((dom = pr->pr_domain) == NULL) 612 return AF_UNSPEC; 613 return dom->dom_family; 614 } 615 616 int 617 sobind(struct socket *so, struct sockaddr *nam, struct lwp *l) 618 { 619 int error; 620 621 solock(so); 622 if (nam->sa_family != so->so_proto->pr_domain->dom_family) { 623 sounlock(so); 624 return EAFNOSUPPORT; 625 } 626 error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l); 627 sounlock(so); 628 return error; 629 } 630 631 int 632 solisten(struct socket *so, int backlog, struct lwp *l) 633 { 634 int error; 635 short oldopt, oldqlimit; 636 637 solock(so); 638 if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING | 639 SS_ISDISCONNECTING)) != 0) { 640 sounlock(so); 641 return EINVAL; 642 } 643 oldopt = so->so_options; 644 oldqlimit = so->so_qlimit; 645 if (TAILQ_EMPTY(&so->so_q)) 646 so->so_options |= SO_ACCEPTCONN; 647 if (backlog < 0) 648 backlog = 0; 649 so->so_qlimit = uimin(backlog, somaxconn); 650 651 error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l); 652 if (error != 0) { 653 so->so_options = oldopt; 654 so->so_qlimit = oldqlimit; 655 sounlock(so); 656 return error; 657 } 658 sounlock(so); 659 return 0; 660 } 661 662 void 663 sofree(struct socket *so) 664 { 665 u_int refs; 666 667 KASSERT(solocked(so)); 668 669 if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) { 670 sounlock(so); 671 return; 672 } 673 if (so->so_head) { 674 /* 675 * We must not decommission a socket that's on the accept(2) 676 * queue. If we do, then accept(2) may hang after select(2) 677 * indicated that the listening socket was ready. 678 */ 679 if (!soqremque(so, 0)) { 680 sounlock(so); 681 return; 682 } 683 } 684 if (so->so_rcv.sb_hiwat) 685 (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0, 686 RLIM_INFINITY); 687 if (so->so_snd.sb_hiwat) 688 (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0, 689 RLIM_INFINITY); 690 sbrelease(&so->so_snd, so); 691 KASSERT(!cv_has_waiters(&so->so_cv)); 692 KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv)); 693 KASSERT(!cv_has_waiters(&so->so_snd.sb_cv)); 694 sorflush(so); 695 refs = so->so_aborting; /* XXX */ 696 /* Remove acccept filter if one is present. */ 697 if (so->so_accf != NULL) 698 (void)accept_filt_clear(so); 699 sounlock(so); 700 if (refs == 0) /* XXX */ 701 soput(so); 702 } 703 704 /* 705 * soclose: close a socket on last file table reference removal. 706 * Initiate disconnect if connected. Free socket when disconnect complete. 707 */ 708 int 709 soclose(struct socket *so) 710 { 711 struct socket *so2; 712 int error = 0; 713 714 solock(so); 715 if (so->so_options & SO_ACCEPTCONN) { 716 for (;;) { 717 if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) { 718 KASSERT(solocked2(so, so2)); 719 (void) soqremque(so2, 0); 720 /* soabort drops the lock. */ 721 (void) soabort(so2); 722 solock(so); 723 continue; 724 } 725 if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) { 726 KASSERT(solocked2(so, so2)); 727 (void) soqremque(so2, 1); 728 /* soabort drops the lock. */ 729 (void) soabort(so2); 730 solock(so); 731 continue; 732 } 733 break; 734 } 735 } 736 if (so->so_pcb == NULL) 737 goto discard; 738 if (so->so_state & SS_ISCONNECTED) { 739 if ((so->so_state & SS_ISDISCONNECTING) == 0) { 740 error = sodisconnect(so); 741 if (error) 742 goto drop; 743 } 744 if (so->so_options & SO_LINGER) { 745 if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) == 746 (SS_ISDISCONNECTING|SS_NBIO)) 747 goto drop; 748 while (so->so_state & SS_ISCONNECTED) { 749 error = sowait(so, true, so->so_linger * hz); 750 if (error) 751 break; 752 } 753 } 754 } 755 drop: 756 if (so->so_pcb) { 757 KASSERT(solocked(so)); 758 (*so->so_proto->pr_usrreqs->pr_detach)(so); 759 } 760 discard: 761 KASSERT((so->so_state & SS_NOFDREF) == 0); 762 kauth_cred_free(so->so_cred); 763 so->so_cred = NULL; 764 so->so_state |= SS_NOFDREF; 765 sofree(so); 766 return error; 767 } 768 769 /* 770 * Must be called with the socket locked.. Will return with it unlocked. 771 */ 772 int 773 soabort(struct socket *so) 774 { 775 u_int refs; 776 int error; 777 778 KASSERT(solocked(so)); 779 KASSERT(so->so_head == NULL); 780 781 so->so_aborting++; /* XXX */ 782 error = (*so->so_proto->pr_usrreqs->pr_abort)(so); 783 refs = --so->so_aborting; /* XXX */ 784 if (error || (refs == 0)) { 785 sofree(so); 786 } else { 787 sounlock(so); 788 } 789 return error; 790 } 791 792 int 793 soaccept(struct socket *so, struct sockaddr *nam) 794 { 795 int error; 796 797 KASSERT(solocked(so)); 798 KASSERT((so->so_state & SS_NOFDREF) != 0); 799 800 so->so_state &= ~SS_NOFDREF; 801 if ((so->so_state & SS_ISDISCONNECTED) == 0 || 802 (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0) 803 error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam); 804 else 805 error = ECONNABORTED; 806 807 return error; 808 } 809 810 int 811 soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l) 812 { 813 int error; 814 815 KASSERT(solocked(so)); 816 817 if (so->so_options & SO_ACCEPTCONN) 818 return EOPNOTSUPP; 819 /* 820 * If protocol is connection-based, can only connect once. 821 * Otherwise, if connected, try to disconnect first. 822 * This allows user to disconnect by connecting to, e.g., 823 * a null address. 824 */ 825 if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && 826 ((so->so_proto->pr_flags & PR_CONNREQUIRED) || 827 (error = sodisconnect(so)))) { 828 error = EISCONN; 829 } else { 830 if (nam->sa_family != so->so_proto->pr_domain->dom_family) { 831 return EAFNOSUPPORT; 832 } 833 error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l); 834 } 835 836 return error; 837 } 838 839 int 840 soconnect2(struct socket *so1, struct socket *so2) 841 { 842 KASSERT(solocked2(so1, so2)); 843 844 return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2); 845 } 846 847 int 848 sodisconnect(struct socket *so) 849 { 850 int error; 851 852 KASSERT(solocked(so)); 853 854 if ((so->so_state & SS_ISCONNECTED) == 0) { 855 error = ENOTCONN; 856 } else if (so->so_state & SS_ISDISCONNECTING) { 857 error = EALREADY; 858 } else { 859 error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so); 860 } 861 return error; 862 } 863 864 #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) 865 /* 866 * Send on a socket. 867 * If send must go all at once and message is larger than 868 * send buffering, then hard error. 869 * Lock against other senders. 870 * If must go all at once and not enough room now, then 871 * inform user that this would block and do nothing. 872 * Otherwise, if nonblocking, send as much as possible. 873 * The data to be sent is described by "uio" if nonzero, 874 * otherwise by the mbuf chain "top" (which must be null 875 * if uio is not). Data provided in mbuf chain must be small 876 * enough to send all at once. 877 * 878 * Returns nonzero on error, timeout or signal; callers 879 * must check for short counts if EINTR/ERESTART are returned. 880 * Data and control buffers are freed on return. 881 */ 882 int 883 sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, 884 struct mbuf *top, struct mbuf *control, int flags, struct lwp *l) 885 { 886 struct mbuf **mp, *m; 887 long space, len, resid, clen, mlen; 888 int error, s, dontroute, atomic; 889 short wakeup_state = 0; 890 891 clen = 0; 892 893 /* 894 * solock() provides atomicity of access. splsoftnet() prevents 895 * protocol processing soft interrupts from interrupting us and 896 * blocking (expensive). 897 */ 898 s = splsoftnet(); 899 solock(so); 900 atomic = sosendallatonce(so) || top; 901 if (uio) 902 resid = uio->uio_resid; 903 else 904 resid = top->m_pkthdr.len; 905 /* 906 * In theory resid should be unsigned. 907 * However, space must be signed, as it might be less than 0 908 * if we over-committed, and we must use a signed comparison 909 * of space and resid. On the other hand, a negative resid 910 * causes us to loop sending 0-length segments to the protocol. 911 */ 912 if (resid < 0) { 913 error = EINVAL; 914 goto out; 915 } 916 dontroute = 917 (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && 918 (so->so_proto->pr_flags & PR_ATOMIC); 919 l->l_ru.ru_msgsnd++; 920 if (control) 921 clen = control->m_len; 922 restart: 923 if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0) 924 goto out; 925 do { 926 if (so->so_state & SS_CANTSENDMORE) { 927 error = EPIPE; 928 goto release; 929 } 930 if (so->so_error) { 931 error = so->so_error; 932 so->so_error = 0; 933 goto release; 934 } 935 if ((so->so_state & SS_ISCONNECTED) == 0) { 936 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 937 if (resid || clen == 0) { 938 error = ENOTCONN; 939 goto release; 940 } 941 } else if (addr == NULL) { 942 error = EDESTADDRREQ; 943 goto release; 944 } 945 } 946 space = sbspace(&so->so_snd); 947 if (flags & MSG_OOB) 948 space += 1024; 949 if ((atomic && resid > so->so_snd.sb_hiwat) || 950 clen > so->so_snd.sb_hiwat) { 951 error = EMSGSIZE; 952 goto release; 953 } 954 if (space < resid + clen && 955 (atomic || space < so->so_snd.sb_lowat || space < clen)) { 956 if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) { 957 error = EWOULDBLOCK; 958 goto release; 959 } 960 sbunlock(&so->so_snd); 961 if (wakeup_state & SS_RESTARTSYS) { 962 error = ERESTART; 963 goto out; 964 } 965 error = sbwait(&so->so_snd); 966 if (error) 967 goto out; 968 wakeup_state = so->so_state; 969 goto restart; 970 } 971 wakeup_state = 0; 972 mp = ⊤ 973 space -= clen; 974 do { 975 if (uio == NULL) { 976 /* 977 * Data is prepackaged in "top". 978 */ 979 resid = 0; 980 if (flags & MSG_EOR) 981 top->m_flags |= M_EOR; 982 } else do { 983 sounlock(so); 984 splx(s); 985 if (top == NULL) { 986 m = m_gethdr(M_WAIT, MT_DATA); 987 mlen = MHLEN; 988 m->m_pkthdr.len = 0; 989 m_reset_rcvif(m); 990 } else { 991 m = m_get(M_WAIT, MT_DATA); 992 mlen = MLEN; 993 } 994 MCLAIM(m, so->so_snd.sb_mowner); 995 if (sock_loan_thresh >= 0 && 996 uio->uio_iov->iov_len >= sock_loan_thresh && 997 space >= sock_loan_thresh && 998 (len = sosend_loan(so, uio, m, 999 space)) != 0) { 1000 SOSEND_COUNTER_INCR(&sosend_loan_big); 1001 space -= len; 1002 goto have_data; 1003 } 1004 if (resid >= MINCLSIZE && space >= MCLBYTES) { 1005 SOSEND_COUNTER_INCR(&sosend_copy_big); 1006 m_clget(m, M_DONTWAIT); 1007 if ((m->m_flags & M_EXT) == 0) 1008 goto nopages; 1009 mlen = MCLBYTES; 1010 if (atomic && top == 0) { 1011 len = lmin(MCLBYTES - max_hdr, 1012 resid); 1013 m->m_data += max_hdr; 1014 } else 1015 len = lmin(MCLBYTES, resid); 1016 space -= len; 1017 } else { 1018 nopages: 1019 SOSEND_COUNTER_INCR(&sosend_copy_small); 1020 len = lmin(lmin(mlen, resid), space); 1021 space -= len; 1022 /* 1023 * For datagram protocols, leave room 1024 * for protocol headers in first mbuf. 1025 */ 1026 if (atomic && top == 0 && len < mlen) 1027 m_align(m, len); 1028 } 1029 error = uiomove(mtod(m, void *), (int)len, uio); 1030 have_data: 1031 resid = uio->uio_resid; 1032 m->m_len = len; 1033 *mp = m; 1034 top->m_pkthdr.len += len; 1035 s = splsoftnet(); 1036 solock(so); 1037 if (error != 0) 1038 goto release; 1039 mp = &m->m_next; 1040 if (resid <= 0) { 1041 if (flags & MSG_EOR) 1042 top->m_flags |= M_EOR; 1043 break; 1044 } 1045 } while (space > 0 && atomic); 1046 1047 if (so->so_state & SS_CANTSENDMORE) { 1048 error = EPIPE; 1049 goto release; 1050 } 1051 if (dontroute) 1052 so->so_options |= SO_DONTROUTE; 1053 if (resid > 0) 1054 so->so_state |= SS_MORETOCOME; 1055 if (flags & MSG_OOB) { 1056 error = (*so->so_proto->pr_usrreqs->pr_sendoob)( 1057 so, top, control); 1058 } else { 1059 error = (*so->so_proto->pr_usrreqs->pr_send)(so, 1060 top, addr, control, l); 1061 } 1062 if (dontroute) 1063 so->so_options &= ~SO_DONTROUTE; 1064 if (resid > 0) 1065 so->so_state &= ~SS_MORETOCOME; 1066 clen = 0; 1067 control = NULL; 1068 top = NULL; 1069 mp = ⊤ 1070 if (error != 0) 1071 goto release; 1072 } while (resid && space > 0); 1073 } while (resid); 1074 1075 release: 1076 sbunlock(&so->so_snd); 1077 out: 1078 sounlock(so); 1079 splx(s); 1080 if (top) 1081 m_freem(top); 1082 if (control) 1083 m_freem(control); 1084 return error; 1085 } 1086 1087 /* 1088 * Following replacement or removal of the first mbuf on the first 1089 * mbuf chain of a socket buffer, push necessary state changes back 1090 * into the socket buffer so that other consumers see the values 1091 * consistently. 'nextrecord' is the caller's locally stored value of 1092 * the original value of sb->sb_mb->m_nextpkt which must be restored 1093 * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL. 1094 */ 1095 static void 1096 sbsync(struct sockbuf *sb, struct mbuf *nextrecord) 1097 { 1098 1099 KASSERT(solocked(sb->sb_so)); 1100 1101 /* 1102 * First, update for the new value of nextrecord. If necessary, 1103 * make it the first record. 1104 */ 1105 if (sb->sb_mb != NULL) 1106 sb->sb_mb->m_nextpkt = nextrecord; 1107 else 1108 sb->sb_mb = nextrecord; 1109 1110 /* 1111 * Now update any dependent socket buffer fields to reflect 1112 * the new state. This is an inline of SB_EMPTY_FIXUP, with 1113 * the addition of a second clause that takes care of the 1114 * case where sb_mb has been updated, but remains the last 1115 * record. 1116 */ 1117 if (sb->sb_mb == NULL) { 1118 sb->sb_mbtail = NULL; 1119 sb->sb_lastrecord = NULL; 1120 } else if (sb->sb_mb->m_nextpkt == NULL) 1121 sb->sb_lastrecord = sb->sb_mb; 1122 } 1123 1124 /* 1125 * Implement receive operations on a socket. 1126 * 1127 * We depend on the way that records are added to the sockbuf by sbappend*. In 1128 * particular, each record (mbufs linked through m_next) must begin with an 1129 * address if the protocol so specifies, followed by an optional mbuf or mbufs 1130 * containing ancillary data, and then zero or more mbufs of data. 1131 * 1132 * In order to avoid blocking network interrupts for the entire time here, we 1133 * splx() while doing the actual copy to user space. Although the sockbuf is 1134 * locked, new data may still be appended, and thus we must maintain 1135 * consistency of the sockbuf during that time. 1136 * 1137 * The caller may receive the data as a single mbuf chain by supplying an mbuf 1138 * **mp0 for use in returning the chain. The uio is then used only for the 1139 * count in uio_resid. 1140 */ 1141 int 1142 soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio, 1143 struct mbuf **mp0, struct mbuf **controlp, int *flagsp) 1144 { 1145 struct lwp *l = curlwp; 1146 struct mbuf *m, **mp, *mt; 1147 size_t len, offset, moff, orig_resid; 1148 int atomic, flags, error, s, type; 1149 const struct protosw *pr; 1150 struct mbuf *nextrecord; 1151 int mbuf_removed = 0; 1152 const struct domain *dom; 1153 short wakeup_state = 0; 1154 1155 pr = so->so_proto; 1156 atomic = pr->pr_flags & PR_ATOMIC; 1157 dom = pr->pr_domain; 1158 mp = mp0; 1159 type = 0; 1160 orig_resid = uio->uio_resid; 1161 1162 if (paddr != NULL) 1163 *paddr = NULL; 1164 if (controlp != NULL) 1165 *controlp = NULL; 1166 if (flagsp != NULL) 1167 flags = *flagsp &~ MSG_EOR; 1168 else 1169 flags = 0; 1170 1171 if (flags & MSG_OOB) { 1172 m = m_get(M_WAIT, MT_DATA); 1173 solock(so); 1174 error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK); 1175 sounlock(so); 1176 if (error) 1177 goto bad; 1178 do { 1179 error = uiomove(mtod(m, void *), 1180 MIN(uio->uio_resid, m->m_len), uio); 1181 m = m_free(m); 1182 } while (uio->uio_resid > 0 && error == 0 && m); 1183 bad: 1184 if (m != NULL) 1185 m_freem(m); 1186 return error; 1187 } 1188 if (mp != NULL) 1189 *mp = NULL; 1190 1191 /* 1192 * solock() provides atomicity of access. splsoftnet() prevents 1193 * protocol processing soft interrupts from interrupting us and 1194 * blocking (expensive). 1195 */ 1196 s = splsoftnet(); 1197 solock(so); 1198 restart: 1199 if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) { 1200 sounlock(so); 1201 splx(s); 1202 return error; 1203 } 1204 m = so->so_rcv.sb_mb; 1205 1206 /* 1207 * If we have less data than requested, block awaiting more 1208 * (subject to any timeout) if: 1209 * 1. the current count is less than the low water mark, 1210 * 2. MSG_WAITALL is set, and it is possible to do the entire 1211 * receive operation at once if we block (resid <= hiwat), or 1212 * 3. MSG_DONTWAIT is not set. 1213 * If MSG_WAITALL is set but resid is larger than the receive buffer, 1214 * we have to do the receive in sections, and thus risk returning 1215 * a short count if a timeout or signal occurs after we start. 1216 */ 1217 if (m == NULL || 1218 ((flags & MSG_DONTWAIT) == 0 && 1219 so->so_rcv.sb_cc < uio->uio_resid && 1220 (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || 1221 ((flags & MSG_WAITALL) && 1222 uio->uio_resid <= so->so_rcv.sb_hiwat)) && 1223 m->m_nextpkt == NULL && !atomic)) { 1224 #ifdef DIAGNOSTIC 1225 if (m == NULL && so->so_rcv.sb_cc) 1226 panic("receive 1"); 1227 #endif 1228 if (so->so_error || so->so_rerror) { 1229 if (m != NULL) 1230 goto dontblock; 1231 if (so->so_error) { 1232 error = so->so_error; 1233 so->so_error = 0; 1234 } else { 1235 error = so->so_rerror; 1236 so->so_rerror = 0; 1237 } 1238 goto release; 1239 } 1240 if (so->so_state & SS_CANTRCVMORE) { 1241 if (m != NULL) 1242 goto dontblock; 1243 else 1244 goto release; 1245 } 1246 for (; m != NULL; m = m->m_next) 1247 if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { 1248 m = so->so_rcv.sb_mb; 1249 goto dontblock; 1250 } 1251 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && 1252 (so->so_proto->pr_flags & PR_CONNREQUIRED)) { 1253 error = ENOTCONN; 1254 goto release; 1255 } 1256 if (uio->uio_resid == 0) 1257 goto release; 1258 if ((so->so_state & SS_NBIO) || 1259 (flags & (MSG_DONTWAIT|MSG_NBIO))) { 1260 error = EWOULDBLOCK; 1261 goto release; 1262 } 1263 SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1"); 1264 SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1"); 1265 sbunlock(&so->so_rcv); 1266 if (wakeup_state & SS_RESTARTSYS) 1267 error = ERESTART; 1268 else 1269 error = sbwait(&so->so_rcv); 1270 if (error != 0) { 1271 sounlock(so); 1272 splx(s); 1273 return error; 1274 } 1275 wakeup_state = so->so_state; 1276 goto restart; 1277 } 1278 1279 dontblock: 1280 /* 1281 * On entry here, m points to the first record of the socket buffer. 1282 * From this point onward, we maintain 'nextrecord' as a cache of the 1283 * pointer to the next record in the socket buffer. We must keep the 1284 * various socket buffer pointers and local stack versions of the 1285 * pointers in sync, pushing out modifications before dropping the 1286 * socket lock, and re-reading them when picking it up. 1287 * 1288 * Otherwise, we will race with the network stack appending new data 1289 * or records onto the socket buffer by using inconsistent/stale 1290 * versions of the field, possibly resulting in socket buffer 1291 * corruption. 1292 * 1293 * By holding the high-level sblock(), we prevent simultaneous 1294 * readers from pulling off the front of the socket buffer. 1295 */ 1296 if (l != NULL) 1297 l->l_ru.ru_msgrcv++; 1298 KASSERT(m == so->so_rcv.sb_mb); 1299 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 1300 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 1301 nextrecord = m->m_nextpkt; 1302 1303 if (pr->pr_flags & PR_ADDR) { 1304 KASSERT(m->m_type == MT_SONAME); 1305 orig_resid = 0; 1306 if (flags & MSG_PEEK) { 1307 if (paddr) 1308 *paddr = m_copym(m, 0, m->m_len, M_DONTWAIT); 1309 m = m->m_next; 1310 } else { 1311 sbfree(&so->so_rcv, m); 1312 mbuf_removed = 1; 1313 if (paddr != NULL) { 1314 *paddr = m; 1315 so->so_rcv.sb_mb = m->m_next; 1316 m->m_next = NULL; 1317 m = so->so_rcv.sb_mb; 1318 } else { 1319 m = so->so_rcv.sb_mb = m_free(m); 1320 } 1321 sbsync(&so->so_rcv, nextrecord); 1322 } 1323 } 1324 1325 if (pr->pr_flags & PR_ADDR_OPT) { 1326 /* 1327 * For SCTP we may be getting a whole message OR a partial 1328 * delivery. 1329 */ 1330 if (m->m_type == MT_SONAME) { 1331 orig_resid = 0; 1332 if (flags & MSG_PEEK) { 1333 if (paddr) 1334 *paddr = m_copym(m, 0, m->m_len, M_DONTWAIT); 1335 m = m->m_next; 1336 } else { 1337 sbfree(&so->so_rcv, m); 1338 /* XXX XXX XXX: should set mbuf_removed? */ 1339 if (paddr) { 1340 *paddr = m; 1341 so->so_rcv.sb_mb = m->m_next; 1342 m->m_next = 0; 1343 m = so->so_rcv.sb_mb; 1344 } else { 1345 m = so->so_rcv.sb_mb = m_free(m); 1346 } 1347 /* XXX XXX XXX: isn't there an sbsync() 1348 * missing here? */ 1349 } 1350 } 1351 } 1352 1353 /* 1354 * Process one or more MT_CONTROL mbufs present before any data mbufs 1355 * in the first mbuf chain on the socket buffer. If MSG_PEEK, we 1356 * just copy the data; if !MSG_PEEK, we call into the protocol to 1357 * perform externalization (or freeing if controlp == NULL). 1358 */ 1359 if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) { 1360 struct mbuf *cm = NULL, *cmn; 1361 struct mbuf **cme = &cm; 1362 1363 do { 1364 if (flags & MSG_PEEK) { 1365 if (controlp != NULL) { 1366 *controlp = m_copym(m, 0, m->m_len, M_DONTWAIT); 1367 controlp = &(*controlp)->m_next; 1368 } 1369 m = m->m_next; 1370 } else { 1371 sbfree(&so->so_rcv, m); 1372 so->so_rcv.sb_mb = m->m_next; 1373 m->m_next = NULL; 1374 *cme = m; 1375 cme = &(*cme)->m_next; 1376 m = so->so_rcv.sb_mb; 1377 } 1378 } while (m != NULL && m->m_type == MT_CONTROL); 1379 if ((flags & MSG_PEEK) == 0) 1380 sbsync(&so->so_rcv, nextrecord); 1381 1382 for (; cm != NULL; cm = cmn) { 1383 cmn = cm->m_next; 1384 cm->m_next = NULL; 1385 type = mtod(cm, struct cmsghdr *)->cmsg_type; 1386 if (controlp != NULL) { 1387 if (dom->dom_externalize != NULL && 1388 type == SCM_RIGHTS) { 1389 sounlock(so); 1390 splx(s); 1391 error = (*dom->dom_externalize)(cm, l, 1392 (flags & MSG_CMSG_CLOEXEC) ? 1393 O_CLOEXEC : 0); 1394 s = splsoftnet(); 1395 solock(so); 1396 } 1397 *controlp = cm; 1398 while (*controlp != NULL) 1399 controlp = &(*controlp)->m_next; 1400 } else { 1401 /* 1402 * Dispose of any SCM_RIGHTS message that went 1403 * through the read path rather than recv. 1404 */ 1405 if (dom->dom_dispose != NULL && 1406 type == SCM_RIGHTS) { 1407 sounlock(so); 1408 (*dom->dom_dispose)(cm); 1409 solock(so); 1410 } 1411 m_freem(cm); 1412 } 1413 } 1414 if (m != NULL) 1415 nextrecord = so->so_rcv.sb_mb->m_nextpkt; 1416 else 1417 nextrecord = so->so_rcv.sb_mb; 1418 orig_resid = 0; 1419 } 1420 1421 /* If m is non-NULL, we have some data to read. */ 1422 if (__predict_true(m != NULL)) { 1423 type = m->m_type; 1424 if (type == MT_OOBDATA) 1425 flags |= MSG_OOB; 1426 } 1427 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 1428 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 1429 1430 moff = 0; 1431 offset = 0; 1432 while (m != NULL && uio->uio_resid > 0 && error == 0) { 1433 /* 1434 * If the type of mbuf has changed, end the receive 1435 * operation and do a short read. 1436 */ 1437 if (m->m_type == MT_OOBDATA) { 1438 if (type != MT_OOBDATA) 1439 break; 1440 } else if (type == MT_OOBDATA) { 1441 break; 1442 } else if (m->m_type == MT_CONTROL) { 1443 break; 1444 } 1445 #ifdef DIAGNOSTIC 1446 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) { 1447 panic("%s: m_type=%d", __func__, m->m_type); 1448 } 1449 #endif 1450 1451 so->so_state &= ~SS_RCVATMARK; 1452 wakeup_state = 0; 1453 len = uio->uio_resid; 1454 if (so->so_oobmark && len > so->so_oobmark - offset) 1455 len = so->so_oobmark - offset; 1456 if (len > m->m_len - moff) 1457 len = m->m_len - moff; 1458 1459 /* 1460 * If mp is set, just pass back the mbufs. 1461 * Otherwise copy them out via the uio, then free. 1462 * Sockbuf must be consistent here (points to current mbuf, 1463 * it points to next record) when we drop priority; 1464 * we must note any additions to the sockbuf when we 1465 * block interrupts again. 1466 */ 1467 if (mp == NULL) { 1468 SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove"); 1469 SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove"); 1470 sounlock(so); 1471 splx(s); 1472 error = uiomove(mtod(m, char *) + moff, len, uio); 1473 s = splsoftnet(); 1474 solock(so); 1475 if (error != 0) { 1476 /* 1477 * If any part of the record has been removed 1478 * (such as the MT_SONAME mbuf, which will 1479 * happen when PR_ADDR, and thus also 1480 * PR_ATOMIC, is set), then drop the entire 1481 * record to maintain the atomicity of the 1482 * receive operation. 1483 * 1484 * This avoids a later panic("receive 1a") 1485 * when compiled with DIAGNOSTIC. 1486 */ 1487 if (m && mbuf_removed && atomic) 1488 (void) sbdroprecord(&so->so_rcv); 1489 1490 goto release; 1491 } 1492 } else { 1493 uio->uio_resid -= len; 1494 } 1495 1496 if (len == m->m_len - moff) { 1497 if (m->m_flags & M_EOR) 1498 flags |= MSG_EOR; 1499 #ifdef SCTP 1500 if (m->m_flags & M_NOTIFICATION) 1501 flags |= MSG_NOTIFICATION; 1502 #endif 1503 if (flags & MSG_PEEK) { 1504 m = m->m_next; 1505 moff = 0; 1506 } else { 1507 nextrecord = m->m_nextpkt; 1508 sbfree(&so->so_rcv, m); 1509 if (mp) { 1510 *mp = m; 1511 mp = &m->m_next; 1512 so->so_rcv.sb_mb = m = m->m_next; 1513 *mp = NULL; 1514 } else { 1515 m = so->so_rcv.sb_mb = m_free(m); 1516 } 1517 /* 1518 * If m != NULL, we also know that 1519 * so->so_rcv.sb_mb != NULL. 1520 */ 1521 KASSERT(so->so_rcv.sb_mb == m); 1522 if (m) { 1523 m->m_nextpkt = nextrecord; 1524 if (nextrecord == NULL) 1525 so->so_rcv.sb_lastrecord = m; 1526 } else { 1527 so->so_rcv.sb_mb = nextrecord; 1528 SB_EMPTY_FIXUP(&so->so_rcv); 1529 } 1530 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 1531 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 1532 } 1533 } else if (flags & MSG_PEEK) { 1534 moff += len; 1535 } else { 1536 if (mp != NULL) { 1537 mt = m_copym(m, 0, len, M_NOWAIT); 1538 if (__predict_false(mt == NULL)) { 1539 sounlock(so); 1540 mt = m_copym(m, 0, len, M_WAIT); 1541 solock(so); 1542 } 1543 *mp = mt; 1544 } 1545 m->m_data += len; 1546 m->m_len -= len; 1547 so->so_rcv.sb_cc -= len; 1548 } 1549 1550 if (so->so_oobmark) { 1551 if ((flags & MSG_PEEK) == 0) { 1552 so->so_oobmark -= len; 1553 if (so->so_oobmark == 0) { 1554 so->so_state |= SS_RCVATMARK; 1555 break; 1556 } 1557 } else { 1558 offset += len; 1559 if (offset == so->so_oobmark) 1560 break; 1561 } 1562 } 1563 if (flags & MSG_EOR) 1564 break; 1565 1566 /* 1567 * If the MSG_WAITALL flag is set (for non-atomic socket), 1568 * we must not quit until "uio->uio_resid == 0" or an error 1569 * termination. If a signal/timeout occurs, return 1570 * with a short count but without error. 1571 * Keep sockbuf locked against other readers. 1572 */ 1573 while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && 1574 !sosendallatonce(so) && !nextrecord) { 1575 if (so->so_error || so->so_rerror || 1576 so->so_state & SS_CANTRCVMORE) 1577 break; 1578 /* 1579 * If we are peeking and the socket receive buffer is 1580 * full, stop since we can't get more data to peek at. 1581 */ 1582 if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0) 1583 break; 1584 /* 1585 * If we've drained the socket buffer, tell the 1586 * protocol in case it needs to do something to 1587 * get it filled again. 1588 */ 1589 if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb) 1590 (*pr->pr_usrreqs->pr_rcvd)(so, flags, l); 1591 SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2"); 1592 SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2"); 1593 if (wakeup_state & SS_RESTARTSYS) 1594 error = ERESTART; 1595 else 1596 error = sbwait(&so->so_rcv); 1597 if (error != 0) { 1598 sbunlock(&so->so_rcv); 1599 sounlock(so); 1600 splx(s); 1601 return 0; 1602 } 1603 if ((m = so->so_rcv.sb_mb) != NULL) 1604 nextrecord = m->m_nextpkt; 1605 wakeup_state = so->so_state; 1606 } 1607 } 1608 1609 if (m && atomic) { 1610 flags |= MSG_TRUNC; 1611 if ((flags & MSG_PEEK) == 0) 1612 (void) sbdroprecord(&so->so_rcv); 1613 } 1614 if ((flags & MSG_PEEK) == 0) { 1615 if (m == NULL) { 1616 /* 1617 * First part is an inline SB_EMPTY_FIXUP(). Second 1618 * part makes sure sb_lastrecord is up-to-date if 1619 * there is still data in the socket buffer. 1620 */ 1621 so->so_rcv.sb_mb = nextrecord; 1622 if (so->so_rcv.sb_mb == NULL) { 1623 so->so_rcv.sb_mbtail = NULL; 1624 so->so_rcv.sb_lastrecord = NULL; 1625 } else if (nextrecord->m_nextpkt == NULL) 1626 so->so_rcv.sb_lastrecord = nextrecord; 1627 } 1628 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 1629 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 1630 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 1631 (*pr->pr_usrreqs->pr_rcvd)(so, flags, l); 1632 } 1633 if (orig_resid == uio->uio_resid && orig_resid && 1634 (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { 1635 sbunlock(&so->so_rcv); 1636 goto restart; 1637 } 1638 1639 if (flagsp != NULL) 1640 *flagsp |= flags; 1641 release: 1642 sbunlock(&so->so_rcv); 1643 sounlock(so); 1644 splx(s); 1645 return error; 1646 } 1647 1648 int 1649 soshutdown(struct socket *so, int how) 1650 { 1651 const struct protosw *pr; 1652 int error; 1653 1654 KASSERT(solocked(so)); 1655 1656 pr = so->so_proto; 1657 if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) 1658 return EINVAL; 1659 1660 if (how == SHUT_RD || how == SHUT_RDWR) { 1661 sorflush(so); 1662 error = 0; 1663 } 1664 if (how == SHUT_WR || how == SHUT_RDWR) 1665 error = (*pr->pr_usrreqs->pr_shutdown)(so); 1666 1667 return error; 1668 } 1669 1670 void 1671 sorestart(struct socket *so) 1672 { 1673 /* 1674 * An application has called close() on an fd on which another 1675 * of its threads has called a socket system call. 1676 * Mark this and wake everyone up, and code that would block again 1677 * instead returns ERESTART. 1678 * On system call re-entry the fd is validated and EBADF returned. 1679 * Any other fd will block again on the 2nd syscall. 1680 */ 1681 solock(so); 1682 so->so_state |= SS_RESTARTSYS; 1683 cv_broadcast(&so->so_cv); 1684 cv_broadcast(&so->so_snd.sb_cv); 1685 cv_broadcast(&so->so_rcv.sb_cv); 1686 sounlock(so); 1687 } 1688 1689 void 1690 sorflush(struct socket *so) 1691 { 1692 struct sockbuf *sb, asb; 1693 const struct protosw *pr; 1694 1695 KASSERT(solocked(so)); 1696 1697 sb = &so->so_rcv; 1698 pr = so->so_proto; 1699 socantrcvmore(so); 1700 sb->sb_flags |= SB_NOINTR; 1701 (void )sblock(sb, M_WAITOK); 1702 sbunlock(sb); 1703 asb = *sb; 1704 /* 1705 * Clear most of the sockbuf structure, but leave some of the 1706 * fields valid. 1707 */ 1708 memset(&sb->sb_startzero, 0, 1709 sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); 1710 if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) { 1711 sounlock(so); 1712 (*pr->pr_domain->dom_dispose)(asb.sb_mb); 1713 solock(so); 1714 } 1715 sbrelease(&asb, so); 1716 } 1717 1718 /* 1719 * internal set SOL_SOCKET options 1720 */ 1721 static int 1722 sosetopt1(struct socket *so, const struct sockopt *sopt) 1723 { 1724 int error, opt; 1725 int optval = 0; /* XXX: gcc */ 1726 struct linger l; 1727 struct timeval tv; 1728 1729 opt = sopt->sopt_name; 1730 1731 switch (opt) { 1732 1733 case SO_ACCEPTFILTER: 1734 error = accept_filt_setopt(so, sopt); 1735 KASSERT(solocked(so)); 1736 break; 1737 1738 case SO_LINGER: 1739 error = sockopt_get(sopt, &l, sizeof(l)); 1740 solock(so); 1741 if (error) 1742 break; 1743 if (l.l_linger < 0 || l.l_linger > USHRT_MAX || 1744 l.l_linger > (INT_MAX / hz)) { 1745 error = EDOM; 1746 break; 1747 } 1748 so->so_linger = l.l_linger; 1749 if (l.l_onoff) 1750 so->so_options |= SO_LINGER; 1751 else 1752 so->so_options &= ~SO_LINGER; 1753 break; 1754 1755 case SO_DEBUG: 1756 case SO_KEEPALIVE: 1757 case SO_DONTROUTE: 1758 case SO_USELOOPBACK: 1759 case SO_BROADCAST: 1760 case SO_REUSEADDR: 1761 case SO_REUSEPORT: 1762 case SO_OOBINLINE: 1763 case SO_TIMESTAMP: 1764 case SO_NOSIGPIPE: 1765 case SO_RERROR: 1766 error = sockopt_getint(sopt, &optval); 1767 solock(so); 1768 if (error) 1769 break; 1770 if (optval) 1771 so->so_options |= opt; 1772 else 1773 so->so_options &= ~opt; 1774 break; 1775 1776 case SO_SNDBUF: 1777 case SO_RCVBUF: 1778 case SO_SNDLOWAT: 1779 case SO_RCVLOWAT: 1780 error = sockopt_getint(sopt, &optval); 1781 solock(so); 1782 if (error) 1783 break; 1784 1785 /* 1786 * Values < 1 make no sense for any of these 1787 * options, so disallow them. 1788 */ 1789 if (optval < 1) { 1790 error = EINVAL; 1791 break; 1792 } 1793 1794 switch (opt) { 1795 case SO_SNDBUF: 1796 if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) { 1797 error = ENOBUFS; 1798 break; 1799 } 1800 so->so_snd.sb_flags &= ~SB_AUTOSIZE; 1801 break; 1802 1803 case SO_RCVBUF: 1804 if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) { 1805 error = ENOBUFS; 1806 break; 1807 } 1808 so->so_rcv.sb_flags &= ~SB_AUTOSIZE; 1809 break; 1810 1811 /* 1812 * Make sure the low-water is never greater than 1813 * the high-water. 1814 */ 1815 case SO_SNDLOWAT: 1816 if (optval > so->so_snd.sb_hiwat) 1817 optval = so->so_snd.sb_hiwat; 1818 1819 so->so_snd.sb_lowat = optval; 1820 break; 1821 1822 case SO_RCVLOWAT: 1823 if (optval > so->so_rcv.sb_hiwat) 1824 optval = so->so_rcv.sb_hiwat; 1825 1826 so->so_rcv.sb_lowat = optval; 1827 break; 1828 } 1829 break; 1830 1831 case SO_SNDTIMEO: 1832 case SO_RCVTIMEO: 1833 solock(so); 1834 error = sockopt_get(sopt, &tv, sizeof(tv)); 1835 if (error) 1836 break; 1837 1838 if (tv.tv_sec < 0 || tv.tv_usec < 0 || tv.tv_usec >= 1000000) { 1839 error = EDOM; 1840 break; 1841 } 1842 if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) { 1843 error = EDOM; 1844 break; 1845 } 1846 1847 optval = tv.tv_sec * hz + tv.tv_usec / tick; 1848 if (optval == 0 && tv.tv_usec != 0) 1849 optval = 1; 1850 1851 switch (opt) { 1852 case SO_SNDTIMEO: 1853 so->so_snd.sb_timeo = optval; 1854 break; 1855 case SO_RCVTIMEO: 1856 so->so_rcv.sb_timeo = optval; 1857 break; 1858 } 1859 break; 1860 1861 default: 1862 MODULE_HOOK_CALL(uipc_socket_50_setopt1_hook, 1863 (opt, so, sopt), enosys(), error); 1864 if (error == ENOSYS || error == EPASSTHROUGH) { 1865 solock(so); 1866 error = ENOPROTOOPT; 1867 } 1868 break; 1869 } 1870 KASSERT(solocked(so)); 1871 return error; 1872 } 1873 1874 int 1875 sosetopt(struct socket *so, struct sockopt *sopt) 1876 { 1877 int error, prerr; 1878 1879 if (sopt->sopt_level == SOL_SOCKET) { 1880 error = sosetopt1(so, sopt); 1881 KASSERT(solocked(so)); 1882 } else { 1883 error = ENOPROTOOPT; 1884 solock(so); 1885 } 1886 1887 if ((error == 0 || error == ENOPROTOOPT) && 1888 so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) { 1889 /* give the protocol stack a shot */ 1890 prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt); 1891 if (prerr == 0) 1892 error = 0; 1893 else if (prerr != ENOPROTOOPT) 1894 error = prerr; 1895 } 1896 sounlock(so); 1897 return error; 1898 } 1899 1900 /* 1901 * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt() 1902 */ 1903 int 1904 so_setsockopt(struct lwp *l, struct socket *so, int level, int name, 1905 const void *val, size_t valsize) 1906 { 1907 struct sockopt sopt; 1908 int error; 1909 1910 KASSERT(valsize == 0 || val != NULL); 1911 1912 sockopt_init(&sopt, level, name, valsize); 1913 sockopt_set(&sopt, val, valsize); 1914 1915 error = sosetopt(so, &sopt); 1916 1917 sockopt_destroy(&sopt); 1918 1919 return error; 1920 } 1921 1922 /* 1923 * internal get SOL_SOCKET options 1924 */ 1925 static int 1926 sogetopt1(struct socket *so, struct sockopt *sopt) 1927 { 1928 int error, optval, opt; 1929 struct linger l; 1930 struct timeval tv; 1931 1932 switch ((opt = sopt->sopt_name)) { 1933 1934 case SO_ACCEPTFILTER: 1935 error = accept_filt_getopt(so, sopt); 1936 break; 1937 1938 case SO_LINGER: 1939 l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0; 1940 l.l_linger = so->so_linger; 1941 1942 error = sockopt_set(sopt, &l, sizeof(l)); 1943 break; 1944 1945 case SO_USELOOPBACK: 1946 case SO_DONTROUTE: 1947 case SO_DEBUG: 1948 case SO_KEEPALIVE: 1949 case SO_REUSEADDR: 1950 case SO_REUSEPORT: 1951 case SO_BROADCAST: 1952 case SO_OOBINLINE: 1953 case SO_TIMESTAMP: 1954 case SO_NOSIGPIPE: 1955 case SO_RERROR: 1956 case SO_ACCEPTCONN: 1957 error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0); 1958 break; 1959 1960 case SO_TYPE: 1961 error = sockopt_setint(sopt, so->so_type); 1962 break; 1963 1964 case SO_ERROR: 1965 if (so->so_error == 0) { 1966 so->so_error = so->so_rerror; 1967 so->so_rerror = 0; 1968 } 1969 error = sockopt_setint(sopt, so->so_error); 1970 so->so_error = 0; 1971 break; 1972 1973 case SO_SNDBUF: 1974 error = sockopt_setint(sopt, so->so_snd.sb_hiwat); 1975 break; 1976 1977 case SO_RCVBUF: 1978 error = sockopt_setint(sopt, so->so_rcv.sb_hiwat); 1979 break; 1980 1981 case SO_SNDLOWAT: 1982 error = sockopt_setint(sopt, so->so_snd.sb_lowat); 1983 break; 1984 1985 case SO_RCVLOWAT: 1986 error = sockopt_setint(sopt, so->so_rcv.sb_lowat); 1987 break; 1988 1989 case SO_SNDTIMEO: 1990 case SO_RCVTIMEO: 1991 optval = (opt == SO_SNDTIMEO ? 1992 so->so_snd.sb_timeo : so->so_rcv.sb_timeo); 1993 1994 memset(&tv, 0, sizeof(tv)); 1995 tv.tv_sec = optval / hz; 1996 tv.tv_usec = (optval % hz) * tick; 1997 1998 error = sockopt_set(sopt, &tv, sizeof(tv)); 1999 break; 2000 2001 case SO_OVERFLOWED: 2002 error = sockopt_setint(sopt, so->so_rcv.sb_overflowed); 2003 break; 2004 2005 default: 2006 MODULE_HOOK_CALL(uipc_socket_50_getopt1_hook, 2007 (opt, so, sopt), enosys(), error); 2008 if (error) 2009 error = ENOPROTOOPT; 2010 break; 2011 } 2012 2013 return error; 2014 } 2015 2016 int 2017 sogetopt(struct socket *so, struct sockopt *sopt) 2018 { 2019 int error; 2020 2021 solock(so); 2022 if (sopt->sopt_level != SOL_SOCKET) { 2023 if (so->so_proto && so->so_proto->pr_ctloutput) { 2024 error = ((*so->so_proto->pr_ctloutput) 2025 (PRCO_GETOPT, so, sopt)); 2026 } else 2027 error = (ENOPROTOOPT); 2028 } else { 2029 error = sogetopt1(so, sopt); 2030 } 2031 sounlock(so); 2032 return error; 2033 } 2034 2035 /* 2036 * alloc sockopt data buffer buffer 2037 * - will be released at destroy 2038 */ 2039 static int 2040 sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag) 2041 { 2042 2043 KASSERT(sopt->sopt_size == 0); 2044 2045 if (len > sizeof(sopt->sopt_buf)) { 2046 sopt->sopt_data = kmem_zalloc(len, kmflag); 2047 if (sopt->sopt_data == NULL) 2048 return ENOMEM; 2049 } else 2050 sopt->sopt_data = sopt->sopt_buf; 2051 2052 sopt->sopt_size = len; 2053 return 0; 2054 } 2055 2056 /* 2057 * initialise sockopt storage 2058 * - MAY sleep during allocation 2059 */ 2060 void 2061 sockopt_init(struct sockopt *sopt, int level, int name, size_t size) 2062 { 2063 2064 memset(sopt, 0, sizeof(*sopt)); 2065 2066 sopt->sopt_level = level; 2067 sopt->sopt_name = name; 2068 (void)sockopt_alloc(sopt, size, KM_SLEEP); 2069 } 2070 2071 /* 2072 * destroy sockopt storage 2073 * - will release any held memory references 2074 */ 2075 void 2076 sockopt_destroy(struct sockopt *sopt) 2077 { 2078 2079 if (sopt->sopt_data != sopt->sopt_buf) 2080 kmem_free(sopt->sopt_data, sopt->sopt_size); 2081 2082 memset(sopt, 0, sizeof(*sopt)); 2083 } 2084 2085 /* 2086 * set sockopt value 2087 * - value is copied into sockopt 2088 * - memory is allocated when necessary, will not sleep 2089 */ 2090 int 2091 sockopt_set(struct sockopt *sopt, const void *buf, size_t len) 2092 { 2093 int error; 2094 2095 if (sopt->sopt_size == 0) { 2096 error = sockopt_alloc(sopt, len, KM_NOSLEEP); 2097 if (error) 2098 return error; 2099 } 2100 2101 sopt->sopt_retsize = MIN(sopt->sopt_size, len); 2102 memcpy(sopt->sopt_data, buf, sopt->sopt_retsize); 2103 2104 return 0; 2105 } 2106 2107 /* 2108 * common case of set sockopt integer value 2109 */ 2110 int 2111 sockopt_setint(struct sockopt *sopt, int val) 2112 { 2113 2114 return sockopt_set(sopt, &val, sizeof(int)); 2115 } 2116 2117 /* 2118 * get sockopt value 2119 * - correct size must be given 2120 */ 2121 int 2122 sockopt_get(const struct sockopt *sopt, void *buf, size_t len) 2123 { 2124 2125 if (sopt->sopt_size != len) 2126 return EINVAL; 2127 2128 memcpy(buf, sopt->sopt_data, len); 2129 return 0; 2130 } 2131 2132 /* 2133 * common case of get sockopt integer value 2134 */ 2135 int 2136 sockopt_getint(const struct sockopt *sopt, int *valp) 2137 { 2138 2139 return sockopt_get(sopt, valp, sizeof(int)); 2140 } 2141 2142 /* 2143 * set sockopt value from mbuf 2144 * - ONLY for legacy code 2145 * - mbuf is released by sockopt 2146 * - will not sleep 2147 */ 2148 int 2149 sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m) 2150 { 2151 size_t len; 2152 int error; 2153 2154 len = m_length(m); 2155 2156 if (sopt->sopt_size == 0) { 2157 error = sockopt_alloc(sopt, len, KM_NOSLEEP); 2158 if (error) 2159 return error; 2160 } 2161 2162 sopt->sopt_retsize = MIN(sopt->sopt_size, len); 2163 m_copydata(m, 0, sopt->sopt_retsize, sopt->sopt_data); 2164 m_freem(m); 2165 2166 return 0; 2167 } 2168 2169 /* 2170 * get sockopt value into mbuf 2171 * - ONLY for legacy code 2172 * - mbuf to be released by the caller 2173 * - will not sleep 2174 */ 2175 struct mbuf * 2176 sockopt_getmbuf(const struct sockopt *sopt) 2177 { 2178 struct mbuf *m; 2179 2180 if (sopt->sopt_size > MCLBYTES) 2181 return NULL; 2182 2183 m = m_get(M_DONTWAIT, MT_SOOPTS); 2184 if (m == NULL) 2185 return NULL; 2186 2187 if (sopt->sopt_size > MLEN) { 2188 MCLGET(m, M_DONTWAIT); 2189 if ((m->m_flags & M_EXT) == 0) { 2190 m_free(m); 2191 return NULL; 2192 } 2193 } 2194 2195 memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size); 2196 m->m_len = sopt->sopt_size; 2197 2198 return m; 2199 } 2200 2201 void 2202 sohasoutofband(struct socket *so) 2203 { 2204 2205 fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so); 2206 selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT); 2207 } 2208 2209 static void 2210 filt_sordetach(struct knote *kn) 2211 { 2212 struct socket *so; 2213 2214 so = ((file_t *)kn->kn_obj)->f_socket; 2215 solock(so); 2216 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); 2217 if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) 2218 so->so_rcv.sb_flags &= ~SB_KNOTE; 2219 sounlock(so); 2220 } 2221 2222 /*ARGSUSED*/ 2223 static int 2224 filt_soread(struct knote *kn, long hint) 2225 { 2226 struct socket *so; 2227 int rv; 2228 2229 so = ((file_t *)kn->kn_obj)->f_socket; 2230 if (hint != NOTE_SUBMIT) 2231 solock(so); 2232 kn->kn_data = so->so_rcv.sb_cc; 2233 if (so->so_state & SS_CANTRCVMORE) { 2234 kn->kn_flags |= EV_EOF; 2235 kn->kn_fflags = so->so_error; 2236 rv = 1; 2237 } else if (so->so_error || so->so_rerror) 2238 rv = 1; 2239 else if (kn->kn_sfflags & NOTE_LOWAT) 2240 rv = (kn->kn_data >= kn->kn_sdata); 2241 else 2242 rv = (kn->kn_data >= so->so_rcv.sb_lowat); 2243 if (hint != NOTE_SUBMIT) 2244 sounlock(so); 2245 return rv; 2246 } 2247 2248 static void 2249 filt_sowdetach(struct knote *kn) 2250 { 2251 struct socket *so; 2252 2253 so = ((file_t *)kn->kn_obj)->f_socket; 2254 solock(so); 2255 SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); 2256 if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) 2257 so->so_snd.sb_flags &= ~SB_KNOTE; 2258 sounlock(so); 2259 } 2260 2261 /*ARGSUSED*/ 2262 static int 2263 filt_sowrite(struct knote *kn, long hint) 2264 { 2265 struct socket *so; 2266 int rv; 2267 2268 so = ((file_t *)kn->kn_obj)->f_socket; 2269 if (hint != NOTE_SUBMIT) 2270 solock(so); 2271 kn->kn_data = sbspace(&so->so_snd); 2272 if (so->so_state & SS_CANTSENDMORE) { 2273 kn->kn_flags |= EV_EOF; 2274 kn->kn_fflags = so->so_error; 2275 rv = 1; 2276 } else if (so->so_error) 2277 rv = 1; 2278 else if (((so->so_state & SS_ISCONNECTED) == 0) && 2279 (so->so_proto->pr_flags & PR_CONNREQUIRED)) 2280 rv = 0; 2281 else if (kn->kn_sfflags & NOTE_LOWAT) 2282 rv = (kn->kn_data >= kn->kn_sdata); 2283 else 2284 rv = (kn->kn_data >= so->so_snd.sb_lowat); 2285 if (hint != NOTE_SUBMIT) 2286 sounlock(so); 2287 return rv; 2288 } 2289 2290 /*ARGSUSED*/ 2291 static int 2292 filt_solisten(struct knote *kn, long hint) 2293 { 2294 struct socket *so; 2295 int rv; 2296 2297 so = ((file_t *)kn->kn_obj)->f_socket; 2298 2299 /* 2300 * Set kn_data to number of incoming connections, not 2301 * counting partial (incomplete) connections. 2302 */ 2303 if (hint != NOTE_SUBMIT) 2304 solock(so); 2305 kn->kn_data = so->so_qlen; 2306 rv = (kn->kn_data > 0); 2307 if (hint != NOTE_SUBMIT) 2308 sounlock(so); 2309 return rv; 2310 } 2311 2312 static const struct filterops solisten_filtops = { 2313 .f_isfd = 1, 2314 .f_attach = NULL, 2315 .f_detach = filt_sordetach, 2316 .f_event = filt_solisten, 2317 }; 2318 2319 static const struct filterops soread_filtops = { 2320 .f_isfd = 1, 2321 .f_attach = NULL, 2322 .f_detach = filt_sordetach, 2323 .f_event = filt_soread, 2324 }; 2325 2326 static const struct filterops sowrite_filtops = { 2327 .f_isfd = 1, 2328 .f_attach = NULL, 2329 .f_detach = filt_sowdetach, 2330 .f_event = filt_sowrite, 2331 }; 2332 2333 int 2334 soo_kqfilter(struct file *fp, struct knote *kn) 2335 { 2336 struct socket *so; 2337 struct sockbuf *sb; 2338 2339 so = ((file_t *)kn->kn_obj)->f_socket; 2340 solock(so); 2341 switch (kn->kn_filter) { 2342 case EVFILT_READ: 2343 if (so->so_options & SO_ACCEPTCONN) 2344 kn->kn_fop = &solisten_filtops; 2345 else 2346 kn->kn_fop = &soread_filtops; 2347 sb = &so->so_rcv; 2348 break; 2349 case EVFILT_WRITE: 2350 kn->kn_fop = &sowrite_filtops; 2351 sb = &so->so_snd; 2352 break; 2353 default: 2354 sounlock(so); 2355 return EINVAL; 2356 } 2357 SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext); 2358 sb->sb_flags |= SB_KNOTE; 2359 sounlock(so); 2360 return 0; 2361 } 2362 2363 static int 2364 sodopoll(struct socket *so, int events) 2365 { 2366 int revents; 2367 2368 revents = 0; 2369 2370 if (events & (POLLIN | POLLRDNORM)) 2371 if (soreadable(so)) 2372 revents |= events & (POLLIN | POLLRDNORM); 2373 2374 if (events & (POLLOUT | POLLWRNORM)) 2375 if (sowritable(so)) 2376 revents |= events & (POLLOUT | POLLWRNORM); 2377 2378 if (events & (POLLPRI | POLLRDBAND)) 2379 if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) 2380 revents |= events & (POLLPRI | POLLRDBAND); 2381 2382 return revents; 2383 } 2384 2385 int 2386 sopoll(struct socket *so, int events) 2387 { 2388 int revents = 0; 2389 2390 #ifndef DIAGNOSTIC 2391 /* 2392 * Do a quick, unlocked check in expectation that the socket 2393 * will be ready for I/O. Don't do this check if DIAGNOSTIC, 2394 * as the solocked() assertions will fail. 2395 */ 2396 if ((revents = sodopoll(so, events)) != 0) 2397 return revents; 2398 #endif 2399 2400 solock(so); 2401 if ((revents = sodopoll(so, events)) == 0) { 2402 if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { 2403 selrecord(curlwp, &so->so_rcv.sb_sel); 2404 so->so_rcv.sb_flags |= SB_NOTIFY; 2405 } 2406 2407 if (events & (POLLOUT | POLLWRNORM)) { 2408 selrecord(curlwp, &so->so_snd.sb_sel); 2409 so->so_snd.sb_flags |= SB_NOTIFY; 2410 } 2411 } 2412 sounlock(so); 2413 2414 return revents; 2415 } 2416 2417 struct mbuf ** 2418 sbsavetimestamp(int opt, struct mbuf **mp) 2419 { 2420 struct timeval tv; 2421 int error; 2422 2423 microtime(&tv); 2424 2425 MODULE_HOOK_CALL(uipc_socket_50_sbts_hook, (opt, &mp), enosys(), error); 2426 if (error == 0) 2427 return mp; 2428 2429 if (opt & SO_TIMESTAMP) { 2430 *mp = sbcreatecontrol(&tv, sizeof(tv), 2431 SCM_TIMESTAMP, SOL_SOCKET); 2432 if (*mp) 2433 mp = &(*mp)->m_next; 2434 } 2435 return mp; 2436 } 2437 2438 2439 #include <sys/sysctl.h> 2440 2441 static int sysctl_kern_somaxkva(SYSCTLFN_PROTO); 2442 static int sysctl_kern_sbmax(SYSCTLFN_PROTO); 2443 2444 /* 2445 * sysctl helper routine for kern.somaxkva. ensures that the given 2446 * value is not too small. 2447 * (XXX should we maybe make sure it's not too large as well?) 2448 */ 2449 static int 2450 sysctl_kern_somaxkva(SYSCTLFN_ARGS) 2451 { 2452 int error, new_somaxkva; 2453 struct sysctlnode node; 2454 2455 new_somaxkva = somaxkva; 2456 node = *rnode; 2457 node.sysctl_data = &new_somaxkva; 2458 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2459 if (error || newp == NULL) 2460 return error; 2461 2462 if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */ 2463 return EINVAL; 2464 2465 mutex_enter(&so_pendfree_lock); 2466 somaxkva = new_somaxkva; 2467 cv_broadcast(&socurkva_cv); 2468 mutex_exit(&so_pendfree_lock); 2469 2470 return error; 2471 } 2472 2473 /* 2474 * sysctl helper routine for kern.sbmax. Basically just ensures that 2475 * any new value is not too small. 2476 */ 2477 static int 2478 sysctl_kern_sbmax(SYSCTLFN_ARGS) 2479 { 2480 int error, new_sbmax; 2481 struct sysctlnode node; 2482 2483 new_sbmax = sb_max; 2484 node = *rnode; 2485 node.sysctl_data = &new_sbmax; 2486 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2487 if (error || newp == NULL) 2488 return error; 2489 2490 KERNEL_LOCK(1, NULL); 2491 error = sb_max_set(new_sbmax); 2492 KERNEL_UNLOCK_ONE(NULL); 2493 2494 return error; 2495 } 2496 2497 /* 2498 * sysctl helper routine for kern.sooptions. Ensures that only allowed 2499 * options can be set. 2500 */ 2501 static int 2502 sysctl_kern_sooptions(SYSCTLFN_ARGS) 2503 { 2504 int error, new_options; 2505 struct sysctlnode node; 2506 2507 new_options = sooptions; 2508 node = *rnode; 2509 node.sysctl_data = &new_options; 2510 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2511 if (error || newp == NULL) 2512 return error; 2513 2514 if (new_options & ~SO_DEFOPTS) 2515 return EINVAL; 2516 2517 sooptions = new_options; 2518 2519 return 0; 2520 } 2521 2522 static void 2523 sysctl_kern_socket_setup(void) 2524 { 2525 2526 KASSERT(socket_sysctllog == NULL); 2527 2528 sysctl_createv(&socket_sysctllog, 0, NULL, NULL, 2529 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2530 CTLTYPE_INT, "somaxkva", 2531 SYSCTL_DESCR("Maximum amount of kernel memory to be " 2532 "used for socket buffers"), 2533 sysctl_kern_somaxkva, 0, NULL, 0, 2534 CTL_KERN, KERN_SOMAXKVA, CTL_EOL); 2535 2536 sysctl_createv(&socket_sysctllog, 0, NULL, NULL, 2537 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2538 CTLTYPE_INT, "sbmax", 2539 SYSCTL_DESCR("Maximum socket buffer size"), 2540 sysctl_kern_sbmax, 0, NULL, 0, 2541 CTL_KERN, KERN_SBMAX, CTL_EOL); 2542 2543 sysctl_createv(&socket_sysctllog, 0, NULL, NULL, 2544 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2545 CTLTYPE_INT, "sooptions", 2546 SYSCTL_DESCR("Default socket options"), 2547 sysctl_kern_sooptions, 0, NULL, 0, 2548 CTL_KERN, CTL_CREATE, CTL_EOL); 2549 } 2550
Indexes created Sat Sep 20 22:09:52 GMT 2025