| 1 | /* $NetBSD: uipc_socket.c,v 1.252 2016/10/13 19:10:23 uwe 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 1.252 2016/10/13 19:10:23 uwe 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 | |
| 108 | #ifdef COMPAT_50 |
| 109 | #include <compat/sys/time.h> |
| 110 | #include <compat/sys/socket.h> |
| 111 | #endif |
| 112 | |
| 113 | #include <uvm/uvm_extern.h> |
| 114 | #include <uvm/uvm_loan.h> |
| 115 | #include <uvm/uvm_page.h> |
| 116 | |
| 117 | MALLOC_DEFINE(M_SONAME, "soname" , "socket name" ); |
| 118 | |
| 119 | extern const struct fileops socketops; |
| 120 | |
| 121 | extern int somaxconn; /* patchable (XXX sysctl) */ |
| 122 | int somaxconn = SOMAXCONN; |
| 123 | kmutex_t *softnet_lock; |
| 124 | |
| 125 | #ifdef SOSEND_COUNTERS |
| 126 | #include <sys/device.h> |
| 127 | |
| 128 | static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 129 | NULL, "sosend" , "loan big" ); |
| 130 | static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 131 | NULL, "sosend" , "copy big" ); |
| 132 | static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 133 | NULL, "sosend" , "copy small" ); |
| 134 | static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 135 | NULL, "sosend" , "kva limit" ); |
| 136 | |
| 137 | #define SOSEND_COUNTER_INCR(ev) (ev)->ev_count++ |
| 138 | |
| 139 | EVCNT_ATTACH_STATIC(sosend_loan_big); |
| 140 | EVCNT_ATTACH_STATIC(sosend_copy_big); |
| 141 | EVCNT_ATTACH_STATIC(sosend_copy_small); |
| 142 | EVCNT_ATTACH_STATIC(sosend_kvalimit); |
| 143 | #else |
| 144 | |
| 145 | #define SOSEND_COUNTER_INCR(ev) /* nothing */ |
| 146 | |
| 147 | #endif /* SOSEND_COUNTERS */ |
| 148 | |
| 149 | #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR) |
| 150 | int sock_loan_thresh = -1; |
| 151 | #else |
| 152 | int sock_loan_thresh = 4096; |
| 153 | #endif |
| 154 | |
| 155 | static kmutex_t so_pendfree_lock; |
| 156 | static struct mbuf *so_pendfree = NULL; |
| 157 | |
| 158 | #ifndef SOMAXKVA |
| 159 | #define SOMAXKVA (16 * 1024 * 1024) |
| 160 | #endif |
| 161 | int somaxkva = SOMAXKVA; |
| 162 | static int socurkva; |
| 163 | static kcondvar_t socurkva_cv; |
| 164 | |
| 165 | static kauth_listener_t socket_listener; |
| 166 | |
| 167 | #define SOCK_LOAN_CHUNK 65536 |
| 168 | |
| 169 | static void sopendfree_thread(void *); |
| 170 | static kcondvar_t pendfree_thread_cv; |
| 171 | static lwp_t *sopendfree_lwp; |
| 172 | |
| 173 | static void sysctl_kern_socket_setup(void); |
| 174 | static struct sysctllog *socket_sysctllog; |
| 175 | |
| 176 | static vsize_t |
| 177 | sokvareserve(struct socket *so, vsize_t len) |
| 178 | { |
| 179 | int error; |
| 180 | |
| 181 | mutex_enter(&so_pendfree_lock); |
| 182 | while (socurkva + len > somaxkva) { |
| 183 | SOSEND_COUNTER_INCR(&sosend_kvalimit); |
| 184 | error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock); |
| 185 | if (error) { |
| 186 | len = 0; |
| 187 | break; |
| 188 | } |
| 189 | } |
| 190 | socurkva += len; |
| 191 | mutex_exit(&so_pendfree_lock); |
| 192 | return len; |
| 193 | } |
| 194 | |
| 195 | static void |
| 196 | sokvaunreserve(vsize_t len) |
| 197 | { |
| 198 | |
| 199 | mutex_enter(&so_pendfree_lock); |
| 200 | socurkva -= len; |
| 201 | cv_broadcast(&socurkva_cv); |
| 202 | mutex_exit(&so_pendfree_lock); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * sokvaalloc: allocate kva for loan. |
| 207 | */ |
| 208 | |
| 209 | vaddr_t |
| 210 | sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so) |
| 211 | { |
| 212 | vaddr_t lva; |
| 213 | |
| 214 | /* |
| 215 | * reserve kva. |
| 216 | */ |
| 217 | |
| 218 | if (sokvareserve(so, len) == 0) |
| 219 | return 0; |
| 220 | |
| 221 | /* |
| 222 | * allocate kva. |
| 223 | */ |
| 224 | |
| 225 | lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask, |
| 226 | UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA); |
| 227 | if (lva == 0) { |
| 228 | sokvaunreserve(len); |
| 229 | return (0); |
| 230 | } |
| 231 | |
| 232 | return lva; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * sokvafree: free kva for loan. |
| 237 | */ |
| 238 | |
| 239 | void |
| 240 | sokvafree(vaddr_t sva, vsize_t len) |
| 241 | { |
| 242 | |
| 243 | /* |
| 244 | * free kva. |
| 245 | */ |
| 246 | |
| 247 | uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY); |
| 248 | |
| 249 | /* |
| 250 | * unreserve kva. |
| 251 | */ |
| 252 | |
| 253 | sokvaunreserve(len); |
| 254 | } |
| 255 | |
| 256 | static void |
| 257 | sodoloanfree(struct vm_page **pgs, void *buf, size_t size) |
| 258 | { |
| 259 | vaddr_t sva, eva; |
| 260 | vsize_t len; |
| 261 | int npgs; |
| 262 | |
| 263 | KASSERT(pgs != NULL); |
| 264 | |
| 265 | eva = round_page((vaddr_t) buf + size); |
| 266 | sva = trunc_page((vaddr_t) buf); |
| 267 | len = eva - sva; |
| 268 | npgs = len >> PAGE_SHIFT; |
| 269 | |
| 270 | pmap_kremove(sva, len); |
| 271 | pmap_update(pmap_kernel()); |
| 272 | uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE); |
| 273 | sokvafree(sva, len); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * sopendfree_thread: free mbufs on "pendfree" list. |
| 278 | * unlock and relock so_pendfree_lock when freeing mbufs. |
| 279 | */ |
| 280 | |
| 281 | static void |
| 282 | sopendfree_thread(void *v) |
| 283 | { |
| 284 | struct mbuf *m, *next; |
| 285 | size_t rv; |
| 286 | |
| 287 | mutex_enter(&so_pendfree_lock); |
| 288 | |
| 289 | for (;;) { |
| 290 | rv = 0; |
| 291 | while (so_pendfree != NULL) { |
| 292 | m = so_pendfree; |
| 293 | so_pendfree = NULL; |
| 294 | mutex_exit(&so_pendfree_lock); |
| 295 | |
| 296 | for (; m != NULL; m = next) { |
| 297 | next = m->m_next; |
| 298 | KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0); |
| 299 | KASSERT(m->m_ext.ext_refcnt == 0); |
| 300 | |
| 301 | rv += m->m_ext.ext_size; |
| 302 | sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf, |
| 303 | m->m_ext.ext_size); |
| 304 | pool_cache_put(mb_cache, m); |
| 305 | } |
| 306 | |
| 307 | mutex_enter(&so_pendfree_lock); |
| 308 | } |
| 309 | if (rv) |
| 310 | cv_broadcast(&socurkva_cv); |
| 311 | cv_wait(&pendfree_thread_cv, &so_pendfree_lock); |
| 312 | } |
| 313 | panic("sopendfree_thread" ); |
| 314 | /* NOTREACHED */ |
| 315 | } |
| 316 | |
| 317 | void |
| 318 | soloanfree(struct mbuf *m, void *buf, size_t size, void *arg) |
| 319 | { |
| 320 | |
| 321 | KASSERT(m != NULL); |
| 322 | |
| 323 | /* |
| 324 | * postpone freeing mbuf. |
| 325 | * |
| 326 | * we can't do it in interrupt context |
| 327 | * because we need to put kva back to kernel_map. |
| 328 | */ |
| 329 | |
| 330 | mutex_enter(&so_pendfree_lock); |
| 331 | m->m_next = so_pendfree; |
| 332 | so_pendfree = m; |
| 333 | cv_signal(&pendfree_thread_cv); |
| 334 | mutex_exit(&so_pendfree_lock); |
| 335 | } |
| 336 | |
| 337 | static long |
| 338 | sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space) |
| 339 | { |
| 340 | struct iovec *iov = uio->uio_iov; |
| 341 | vaddr_t sva, eva; |
| 342 | vsize_t len; |
| 343 | vaddr_t lva; |
| 344 | int npgs, error; |
| 345 | vaddr_t va; |
| 346 | int i; |
| 347 | |
| 348 | if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace)) |
| 349 | return (0); |
| 350 | |
| 351 | if (iov->iov_len < (size_t) space) |
| 352 | space = iov->iov_len; |
| 353 | if (space > SOCK_LOAN_CHUNK) |
| 354 | space = SOCK_LOAN_CHUNK; |
| 355 | |
| 356 | eva = round_page((vaddr_t) iov->iov_base + space); |
| 357 | sva = trunc_page((vaddr_t) iov->iov_base); |
| 358 | len = eva - sva; |
| 359 | npgs = len >> PAGE_SHIFT; |
| 360 | |
| 361 | KASSERT(npgs <= M_EXT_MAXPAGES); |
| 362 | |
| 363 | lva = sokvaalloc(sva, len, so); |
| 364 | if (lva == 0) |
| 365 | return 0; |
| 366 | |
| 367 | error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len, |
| 368 | m->m_ext.ext_pgs, UVM_LOAN_TOPAGE); |
| 369 | if (error) { |
| 370 | sokvafree(lva, len); |
| 371 | return (0); |
| 372 | } |
| 373 | |
| 374 | for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE) |
| 375 | pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]), |
| 376 | VM_PROT_READ, 0); |
| 377 | pmap_update(pmap_kernel()); |
| 378 | |
| 379 | lva += (vaddr_t) iov->iov_base & PAGE_MASK; |
| 380 | |
| 381 | MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so); |
| 382 | m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP; |
| 383 | |
| 384 | uio->uio_resid -= space; |
| 385 | /* uio_offset not updated, not set/used for write(2) */ |
| 386 | uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space; |
| 387 | uio->uio_iov->iov_len -= space; |
| 388 | if (uio->uio_iov->iov_len == 0) { |
| 389 | uio->uio_iov++; |
| 390 | uio->uio_iovcnt--; |
| 391 | } |
| 392 | |
| 393 | return (space); |
| 394 | } |
| 395 | |
| 396 | struct mbuf * |
| 397 | getsombuf(struct socket *so, int type) |
| 398 | { |
| 399 | struct mbuf *m; |
| 400 | |
| 401 | m = m_get(M_WAIT, type); |
| 402 | MCLAIM(m, so->so_mowner); |
| 403 | return m; |
| 404 | } |
| 405 | |
| 406 | static int |
| 407 | socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
| 408 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 409 | { |
| 410 | int result; |
| 411 | enum kauth_network_req req; |
| 412 | |
| 413 | result = KAUTH_RESULT_DEFER; |
| 414 | req = (enum kauth_network_req)arg0; |
| 415 | |
| 416 | if ((action != KAUTH_NETWORK_SOCKET) && |
| 417 | (action != KAUTH_NETWORK_BIND)) |
| 418 | return result; |
| 419 | |
| 420 | switch (req) { |
| 421 | case KAUTH_REQ_NETWORK_BIND_PORT: |
| 422 | result = KAUTH_RESULT_ALLOW; |
| 423 | break; |
| 424 | |
| 425 | case KAUTH_REQ_NETWORK_SOCKET_DROP: { |
| 426 | /* Normal users can only drop their own connections. */ |
| 427 | struct socket *so = (struct socket *)arg1; |
| 428 | |
| 429 | if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0) |
| 430 | result = KAUTH_RESULT_ALLOW; |
| 431 | |
| 432 | break; |
| 433 | } |
| 434 | |
| 435 | case KAUTH_REQ_NETWORK_SOCKET_OPEN: |
| 436 | /* We allow "raw" routing/bluetooth sockets to anyone. */ |
| 437 | if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE |
| 438 | || (u_long)arg1 == PF_BLUETOOTH) { |
| 439 | result = KAUTH_RESULT_ALLOW; |
| 440 | } else { |
| 441 | /* Privileged, let secmodel handle this. */ |
| 442 | if ((u_long)arg2 == SOCK_RAW) |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | result = KAUTH_RESULT_ALLOW; |
| 447 | |
| 448 | break; |
| 449 | |
| 450 | case KAUTH_REQ_NETWORK_SOCKET_CANSEE: |
| 451 | result = KAUTH_RESULT_ALLOW; |
| 452 | |
| 453 | break; |
| 454 | |
| 455 | default: |
| 456 | break; |
| 457 | } |
| 458 | |
| 459 | return result; |
| 460 | } |
| 461 | |
| 462 | void |
| 463 | soinit(void) |
| 464 | { |
| 465 | |
| 466 | sysctl_kern_socket_setup(); |
| 467 | |
| 468 | mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM); |
| 469 | softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); |
| 470 | cv_init(&socurkva_cv, "sokva" ); |
| 471 | cv_init(&pendfree_thread_cv, "sopendfr" ); |
| 472 | soinit2(); |
| 473 | |
| 474 | /* Set the initial adjusted socket buffer size. */ |
| 475 | if (sb_max_set(sb_max)) |
| 476 | panic("bad initial sb_max value: %lu" , sb_max); |
| 477 | |
| 478 | socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, |
| 479 | socket_listener_cb, NULL); |
| 480 | } |
| 481 | |
| 482 | void |
| 483 | soinit1(void) |
| 484 | { |
| 485 | int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, |
| 486 | sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree" ); |
| 487 | if (error) |
| 488 | panic("soinit1 %d" , error); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * socreate: create a new socket of the specified type and the protocol. |
| 493 | * |
| 494 | * => Caller may specify another socket for lock sharing (must not be held). |
| 495 | * => Returns the new socket without lock held. |
| 496 | */ |
| 497 | int |
| 498 | socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l, |
| 499 | struct socket *lockso) |
| 500 | { |
| 501 | const struct protosw *prp; |
| 502 | struct socket *so; |
| 503 | uid_t uid; |
| 504 | int error; |
| 505 | kmutex_t *lock; |
| 506 | |
| 507 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET, |
| 508 | KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type), |
| 509 | KAUTH_ARG(proto)); |
| 510 | if (error != 0) |
| 511 | return error; |
| 512 | |
| 513 | if (proto) |
| 514 | prp = pffindproto(dom, proto, type); |
| 515 | else |
| 516 | prp = pffindtype(dom, type); |
| 517 | if (prp == NULL) { |
| 518 | /* no support for domain */ |
| 519 | if (pffinddomain(dom) == 0) |
| 520 | return EAFNOSUPPORT; |
| 521 | /* no support for socket type */ |
| 522 | if (proto == 0 && type != 0) |
| 523 | return EPROTOTYPE; |
| 524 | return EPROTONOSUPPORT; |
| 525 | } |
| 526 | if (prp->pr_usrreqs == NULL) |
| 527 | return EPROTONOSUPPORT; |
| 528 | if (prp->pr_type != type) |
| 529 | return EPROTOTYPE; |
| 530 | |
| 531 | so = soget(true); |
| 532 | so->so_type = type; |
| 533 | so->so_proto = prp; |
| 534 | so->so_send = sosend; |
| 535 | so->so_receive = soreceive; |
| 536 | #ifdef MBUFTRACE |
| 537 | so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner; |
| 538 | so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner; |
| 539 | so->so_mowner = &prp->pr_domain->dom_mowner; |
| 540 | #endif |
| 541 | uid = kauth_cred_geteuid(l->l_cred); |
| 542 | so->so_uidinfo = uid_find(uid); |
| 543 | so->so_cpid = l->l_proc->p_pid; |
| 544 | |
| 545 | /* |
| 546 | * Lock assigned and taken during PCB attach, unless we share |
| 547 | * the lock with another socket, e.g. socketpair(2) case. |
| 548 | */ |
| 549 | if (lockso) { |
| 550 | lock = lockso->so_lock; |
| 551 | so->so_lock = lock; |
| 552 | mutex_obj_hold(lock); |
| 553 | mutex_enter(lock); |
| 554 | } |
| 555 | |
| 556 | /* Attach the PCB (returns with the socket lock held). */ |
| 557 | error = (*prp->pr_usrreqs->pr_attach)(so, proto); |
| 558 | KASSERT(solocked(so)); |
| 559 | |
| 560 | if (error) { |
| 561 | KASSERT(so->so_pcb == NULL); |
| 562 | so->so_state |= SS_NOFDREF; |
| 563 | sofree(so); |
| 564 | return error; |
| 565 | } |
| 566 | so->so_cred = kauth_cred_dup(l->l_cred); |
| 567 | sounlock(so); |
| 568 | |
| 569 | *aso = so; |
| 570 | return 0; |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * fsocreate: create a socket and a file descriptor associated with it. |
| 575 | * |
| 576 | * => On success, write file descriptor to fdout and return zero. |
| 577 | * => On failure, return non-zero; *fdout will be undefined. |
| 578 | */ |
| 579 | int |
| 580 | fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout) |
| 581 | { |
| 582 | lwp_t *l = curlwp; |
| 583 | int error, fd, flags; |
| 584 | struct socket *so; |
| 585 | struct file *fp; |
| 586 | |
| 587 | if ((error = fd_allocfile(&fp, &fd)) != 0) { |
| 588 | return error; |
| 589 | } |
| 590 | flags = type & SOCK_FLAGS_MASK; |
| 591 | fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0); |
| 592 | fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)| |
| 593 | ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0); |
| 594 | fp->f_type = DTYPE_SOCKET; |
| 595 | fp->f_ops = &socketops; |
| 596 | |
| 597 | type &= ~SOCK_FLAGS_MASK; |
| 598 | error = socreate(domain, &so, type, proto, l, NULL); |
| 599 | if (error) { |
| 600 | fd_abort(curproc, fp, fd); |
| 601 | return error; |
| 602 | } |
| 603 | if (flags & SOCK_NONBLOCK) { |
| 604 | so->so_state |= SS_NBIO; |
| 605 | } |
| 606 | fp->f_socket = so; |
| 607 | fd_affix(curproc, fp, fd); |
| 608 | |
| 609 | if (sop != NULL) { |
| 610 | *sop = so; |
| 611 | } |
| 612 | *fdout = fd; |
| 613 | return error; |
| 614 | } |
| 615 | |
| 616 | int |
| 617 | sofamily(const struct socket *so) |
| 618 | { |
| 619 | const struct protosw *pr; |
| 620 | const struct domain *dom; |
| 621 | |
| 622 | if ((pr = so->so_proto) == NULL) |
| 623 | return AF_UNSPEC; |
| 624 | if ((dom = pr->pr_domain) == NULL) |
| 625 | return AF_UNSPEC; |
| 626 | return dom->dom_family; |
| 627 | } |
| 628 | |
| 629 | int |
| 630 | sobind(struct socket *so, struct sockaddr *nam, struct lwp *l) |
| 631 | { |
| 632 | int error; |
| 633 | |
| 634 | solock(so); |
| 635 | if (nam->sa_family != so->so_proto->pr_domain->dom_family) { |
| 636 | sounlock(so); |
| 637 | return EAFNOSUPPORT; |
| 638 | } |
| 639 | error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l); |
| 640 | sounlock(so); |
| 641 | return error; |
| 642 | } |
| 643 | |
| 644 | int |
| 645 | solisten(struct socket *so, int backlog, struct lwp *l) |
| 646 | { |
| 647 | int error; |
| 648 | short oldopt, oldqlimit; |
| 649 | |
| 650 | solock(so); |
| 651 | if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING | |
| 652 | SS_ISDISCONNECTING)) != 0) { |
| 653 | sounlock(so); |
| 654 | return EINVAL; |
| 655 | } |
| 656 | oldopt = so->so_options; |
| 657 | oldqlimit = so->so_qlimit; |
| 658 | if (TAILQ_EMPTY(&so->so_q)) |
| 659 | so->so_options |= SO_ACCEPTCONN; |
| 660 | if (backlog < 0) |
| 661 | backlog = 0; |
| 662 | so->so_qlimit = min(backlog, somaxconn); |
| 663 | |
| 664 | error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l); |
| 665 | if (error != 0) { |
| 666 | so->so_options = oldopt; |
| 667 | so->so_qlimit = oldqlimit; |
| 668 | sounlock(so); |
| 669 | return error; |
| 670 | } |
| 671 | sounlock(so); |
| 672 | return 0; |
| 673 | } |
| 674 | |
| 675 | void |
| 676 | sofree(struct socket *so) |
| 677 | { |
| 678 | u_int refs; |
| 679 | |
| 680 | KASSERT(solocked(so)); |
| 681 | |
| 682 | if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) { |
| 683 | sounlock(so); |
| 684 | return; |
| 685 | } |
| 686 | if (so->so_head) { |
| 687 | /* |
| 688 | * We must not decommission a socket that's on the accept(2) |
| 689 | * queue. If we do, then accept(2) may hang after select(2) |
| 690 | * indicated that the listening socket was ready. |
| 691 | */ |
| 692 | if (!soqremque(so, 0)) { |
| 693 | sounlock(so); |
| 694 | return; |
| 695 | } |
| 696 | } |
| 697 | if (so->so_rcv.sb_hiwat) |
| 698 | (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0, |
| 699 | RLIM_INFINITY); |
| 700 | if (so->so_snd.sb_hiwat) |
| 701 | (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0, |
| 702 | RLIM_INFINITY); |
| 703 | sbrelease(&so->so_snd, so); |
| 704 | KASSERT(!cv_has_waiters(&so->so_cv)); |
| 705 | KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv)); |
| 706 | KASSERT(!cv_has_waiters(&so->so_snd.sb_cv)); |
| 707 | sorflush(so); |
| 708 | refs = so->so_aborting; /* XXX */ |
| 709 | /* Remove acccept filter if one is present. */ |
| 710 | if (so->so_accf != NULL) |
| 711 | (void)accept_filt_clear(so); |
| 712 | sounlock(so); |
| 713 | if (refs == 0) /* XXX */ |
| 714 | soput(so); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * soclose: close a socket on last file table reference removal. |
| 719 | * Initiate disconnect if connected. Free socket when disconnect complete. |
| 720 | */ |
| 721 | int |
| 722 | soclose(struct socket *so) |
| 723 | { |
| 724 | struct socket *so2; |
| 725 | int error = 0; |
| 726 | |
| 727 | solock(so); |
| 728 | if (so->so_options & SO_ACCEPTCONN) { |
| 729 | for (;;) { |
| 730 | if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) { |
| 731 | KASSERT(solocked2(so, so2)); |
| 732 | (void) soqremque(so2, 0); |
| 733 | /* soabort drops the lock. */ |
| 734 | (void) soabort(so2); |
| 735 | solock(so); |
| 736 | continue; |
| 737 | } |
| 738 | if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) { |
| 739 | KASSERT(solocked2(so, so2)); |
| 740 | (void) soqremque(so2, 1); |
| 741 | /* soabort drops the lock. */ |
| 742 | (void) soabort(so2); |
| 743 | solock(so); |
| 744 | continue; |
| 745 | } |
| 746 | break; |
| 747 | } |
| 748 | } |
| 749 | if (so->so_pcb == NULL) |
| 750 | goto discard; |
| 751 | if (so->so_state & SS_ISCONNECTED) { |
| 752 | if ((so->so_state & SS_ISDISCONNECTING) == 0) { |
| 753 | error = sodisconnect(so); |
| 754 | if (error) |
| 755 | goto drop; |
| 756 | } |
| 757 | if (so->so_options & SO_LINGER) { |
| 758 | if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) == |
| 759 | (SS_ISDISCONNECTING|SS_NBIO)) |
| 760 | goto drop; |
| 761 | while (so->so_state & SS_ISCONNECTED) { |
| 762 | error = sowait(so, true, so->so_linger * hz); |
| 763 | if (error) |
| 764 | break; |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | drop: |
| 769 | if (so->so_pcb) { |
| 770 | KASSERT(solocked(so)); |
| 771 | (*so->so_proto->pr_usrreqs->pr_detach)(so); |
| 772 | } |
| 773 | discard: |
| 774 | KASSERT((so->so_state & SS_NOFDREF) == 0); |
| 775 | kauth_cred_free(so->so_cred); |
| 776 | so->so_state |= SS_NOFDREF; |
| 777 | sofree(so); |
| 778 | return error; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Must be called with the socket locked.. Will return with it unlocked. |
| 783 | */ |
| 784 | int |
| 785 | soabort(struct socket *so) |
| 786 | { |
| 787 | u_int refs; |
| 788 | int error; |
| 789 | |
| 790 | KASSERT(solocked(so)); |
| 791 | KASSERT(so->so_head == NULL); |
| 792 | |
| 793 | so->so_aborting++; /* XXX */ |
| 794 | error = (*so->so_proto->pr_usrreqs->pr_abort)(so); |
| 795 | refs = --so->so_aborting; /* XXX */ |
| 796 | if (error || (refs == 0)) { |
| 797 | sofree(so); |
| 798 | } else { |
| 799 | sounlock(so); |
| 800 | } |
| 801 | return error; |
| 802 | } |
| 803 | |
| 804 | int |
| 805 | soaccept(struct socket *so, struct sockaddr *nam) |
| 806 | { |
| 807 | int error; |
| 808 | |
| 809 | KASSERT(solocked(so)); |
| 810 | KASSERT((so->so_state & SS_NOFDREF) != 0); |
| 811 | |
| 812 | so->so_state &= ~SS_NOFDREF; |
| 813 | if ((so->so_state & SS_ISDISCONNECTED) == 0 || |
| 814 | (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0) |
| 815 | error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam); |
| 816 | else |
| 817 | error = ECONNABORTED; |
| 818 | |
| 819 | return error; |
| 820 | } |
| 821 | |
| 822 | int |
| 823 | soconnect(struct socket *so, struct sockaddr *nam, struct lwp *l) |
| 824 | { |
| 825 | int error; |
| 826 | |
| 827 | KASSERT(solocked(so)); |
| 828 | |
| 829 | if (so->so_options & SO_ACCEPTCONN) |
| 830 | return EOPNOTSUPP; |
| 831 | /* |
| 832 | * If protocol is connection-based, can only connect once. |
| 833 | * Otherwise, if connected, try to disconnect first. |
| 834 | * This allows user to disconnect by connecting to, e.g., |
| 835 | * a null address. |
| 836 | */ |
| 837 | if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && |
| 838 | ((so->so_proto->pr_flags & PR_CONNREQUIRED) || |
| 839 | (error = sodisconnect(so)))) { |
| 840 | error = EISCONN; |
| 841 | } else { |
| 842 | if (nam->sa_family != so->so_proto->pr_domain->dom_family) { |
| 843 | return EAFNOSUPPORT; |
| 844 | } |
| 845 | error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l); |
| 846 | } |
| 847 | |
| 848 | return error; |
| 849 | } |
| 850 | |
| 851 | int |
| 852 | soconnect2(struct socket *so1, struct socket *so2) |
| 853 | { |
| 854 | KASSERT(solocked2(so1, so2)); |
| 855 | |
| 856 | return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2); |
| 857 | } |
| 858 | |
| 859 | int |
| 860 | sodisconnect(struct socket *so) |
| 861 | { |
| 862 | int error; |
| 863 | |
| 864 | KASSERT(solocked(so)); |
| 865 | |
| 866 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 867 | error = ENOTCONN; |
| 868 | } else if (so->so_state & SS_ISDISCONNECTING) { |
| 869 | error = EALREADY; |
| 870 | } else { |
| 871 | error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so); |
| 872 | } |
| 873 | return (error); |
| 874 | } |
| 875 | |
| 876 | #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) |
| 877 | /* |
| 878 | * Send on a socket. |
| 879 | * If send must go all at once and message is larger than |
| 880 | * send buffering, then hard error. |
| 881 | * Lock against other senders. |
| 882 | * If must go all at once and not enough room now, then |
| 883 | * inform user that this would block and do nothing. |
| 884 | * Otherwise, if nonblocking, send as much as possible. |
| 885 | * The data to be sent is described by "uio" if nonzero, |
| 886 | * otherwise by the mbuf chain "top" (which must be null |
| 887 | * if uio is not). Data provided in mbuf chain must be small |
| 888 | * enough to send all at once. |
| 889 | * |
| 890 | * Returns nonzero on error, timeout or signal; callers |
| 891 | * must check for short counts if EINTR/ERESTART are returned. |
| 892 | * Data and control buffers are freed on return. |
| 893 | */ |
| 894 | int |
| 895 | sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, |
| 896 | struct mbuf *top, struct mbuf *control, int flags, struct lwp *l) |
| 897 | { |
| 898 | struct mbuf **mp, *m; |
| 899 | long space, len, resid, clen, mlen; |
| 900 | int error, s, dontroute, atomic; |
| 901 | short wakeup_state = 0; |
| 902 | |
| 903 | clen = 0; |
| 904 | |
| 905 | /* |
| 906 | * solock() provides atomicity of access. splsoftnet() prevents |
| 907 | * protocol processing soft interrupts from interrupting us and |
| 908 | * blocking (expensive). |
| 909 | */ |
| 910 | s = splsoftnet(); |
| 911 | solock(so); |
| 912 | atomic = sosendallatonce(so) || top; |
| 913 | if (uio) |
| 914 | resid = uio->uio_resid; |
| 915 | else |
| 916 | resid = top->m_pkthdr.len; |
| 917 | /* |
| 918 | * In theory resid should be unsigned. |
| 919 | * However, space must be signed, as it might be less than 0 |
| 920 | * if we over-committed, and we must use a signed comparison |
| 921 | * of space and resid. On the other hand, a negative resid |
| 922 | * causes us to loop sending 0-length segments to the protocol. |
| 923 | */ |
| 924 | if (resid < 0) { |
| 925 | error = EINVAL; |
| 926 | goto out; |
| 927 | } |
| 928 | dontroute = |
| 929 | (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && |
| 930 | (so->so_proto->pr_flags & PR_ATOMIC); |
| 931 | l->l_ru.ru_msgsnd++; |
| 932 | if (control) |
| 933 | clen = control->m_len; |
| 934 | restart: |
| 935 | if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0) |
| 936 | goto out; |
| 937 | do { |
| 938 | if (so->so_state & SS_CANTSENDMORE) { |
| 939 | error = EPIPE; |
| 940 | goto release; |
| 941 | } |
| 942 | if (so->so_error) { |
| 943 | error = so->so_error; |
| 944 | so->so_error = 0; |
| 945 | goto release; |
| 946 | } |
| 947 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
| 948 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { |
| 949 | if (resid || clen == 0) { |
| 950 | error = ENOTCONN; |
| 951 | goto release; |
| 952 | } |
| 953 | } else if (addr == NULL) { |
| 954 | error = EDESTADDRREQ; |
| 955 | goto release; |
| 956 | } |
| 957 | } |
| 958 | space = sbspace(&so->so_snd); |
| 959 | if (flags & MSG_OOB) |
| 960 | space += 1024; |
| 961 | if ((atomic && resid > so->so_snd.sb_hiwat) || |
| 962 | clen > so->so_snd.sb_hiwat) { |
| 963 | error = EMSGSIZE; |
| 964 | goto release; |
| 965 | } |
| 966 | if (space < resid + clen && |
| 967 | (atomic || space < so->so_snd.sb_lowat || space < clen)) { |
| 968 | if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) { |
| 969 | error = EWOULDBLOCK; |
| 970 | goto release; |
| 971 | } |
| 972 | sbunlock(&so->so_snd); |
| 973 | if (wakeup_state & SS_RESTARTSYS) { |
| 974 | error = ERESTART; |
| 975 | goto out; |
| 976 | } |
| 977 | error = sbwait(&so->so_snd); |
| 978 | if (error) |
| 979 | goto out; |
| 980 | wakeup_state = so->so_state; |
| 981 | goto restart; |
| 982 | } |
| 983 | wakeup_state = 0; |
| 984 | mp = ⊤ |
| 985 | space -= clen; |
| 986 | do { |
| 987 | if (uio == NULL) { |
| 988 | /* |
| 989 | * Data is prepackaged in "top". |
| 990 | */ |
| 991 | resid = 0; |
| 992 | if (flags & MSG_EOR) |
| 993 | top->m_flags |= M_EOR; |
| 994 | } else do { |
| 995 | sounlock(so); |
| 996 | splx(s); |
| 997 | if (top == NULL) { |
| 998 | m = m_gethdr(M_WAIT, MT_DATA); |
| 999 | mlen = MHLEN; |
| 1000 | m->m_pkthdr.len = 0; |
| 1001 | m_reset_rcvif(m); |
| 1002 | } else { |
| 1003 | m = m_get(M_WAIT, MT_DATA); |
| 1004 | mlen = MLEN; |
| 1005 | } |
| 1006 | MCLAIM(m, so->so_snd.sb_mowner); |
| 1007 | if (sock_loan_thresh >= 0 && |
| 1008 | uio->uio_iov->iov_len >= sock_loan_thresh && |
| 1009 | space >= sock_loan_thresh && |
| 1010 | (len = sosend_loan(so, uio, m, |
| 1011 | space)) != 0) { |
| 1012 | SOSEND_COUNTER_INCR(&sosend_loan_big); |
| 1013 | space -= len; |
| 1014 | goto have_data; |
| 1015 | } |
| 1016 | if (resid >= MINCLSIZE && space >= MCLBYTES) { |
| 1017 | SOSEND_COUNTER_INCR(&sosend_copy_big); |
| 1018 | m_clget(m, M_DONTWAIT); |
| 1019 | if ((m->m_flags & M_EXT) == 0) |
| 1020 | goto nopages; |
| 1021 | mlen = MCLBYTES; |
| 1022 | if (atomic && top == 0) { |
| 1023 | len = lmin(MCLBYTES - max_hdr, |
| 1024 | resid); |
| 1025 | m->m_data += max_hdr; |
| 1026 | } else |
| 1027 | len = lmin(MCLBYTES, resid); |
| 1028 | space -= len; |
| 1029 | } else { |
| 1030 | nopages: |
| 1031 | SOSEND_COUNTER_INCR(&sosend_copy_small); |
| 1032 | len = lmin(lmin(mlen, resid), space); |
| 1033 | space -= len; |
| 1034 | /* |
| 1035 | * For datagram protocols, leave room |
| 1036 | * for protocol headers in first mbuf. |
| 1037 | */ |
| 1038 | if (atomic && top == 0 && len < mlen) |
| 1039 | MH_ALIGN(m, len); |
| 1040 | } |
| 1041 | error = uiomove(mtod(m, void *), (int)len, uio); |
| 1042 | have_data: |
| 1043 | resid = uio->uio_resid; |
| 1044 | m->m_len = len; |
| 1045 | *mp = m; |
| 1046 | top->m_pkthdr.len += len; |
| 1047 | s = splsoftnet(); |
| 1048 | solock(so); |
| 1049 | if (error != 0) |
| 1050 | goto release; |
| 1051 | mp = &m->m_next; |
| 1052 | if (resid <= 0) { |
| 1053 | if (flags & MSG_EOR) |
| 1054 | top->m_flags |= M_EOR; |
| 1055 | break; |
| 1056 | } |
| 1057 | } while (space > 0 && atomic); |
| 1058 | |
| 1059 | if (so->so_state & SS_CANTSENDMORE) { |
| 1060 | error = EPIPE; |
| 1061 | goto release; |
| 1062 | } |
| 1063 | if (dontroute) |
| 1064 | so->so_options |= SO_DONTROUTE; |
| 1065 | if (resid > 0) |
| 1066 | so->so_state |= SS_MORETOCOME; |
| 1067 | if (flags & MSG_OOB) { |
| 1068 | error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so, |
| 1069 | top, control); |
| 1070 | } else { |
| 1071 | error = (*so->so_proto->pr_usrreqs->pr_send)(so, |
| 1072 | top, addr, control, l); |
| 1073 | } |
| 1074 | if (dontroute) |
| 1075 | so->so_options &= ~SO_DONTROUTE; |
| 1076 | if (resid > 0) |
| 1077 | so->so_state &= ~SS_MORETOCOME; |
| 1078 | clen = 0; |
| 1079 | control = NULL; |
| 1080 | top = NULL; |
| 1081 | mp = ⊤ |
| 1082 | if (error != 0) |
| 1083 | goto release; |
| 1084 | } while (resid && space > 0); |
| 1085 | } while (resid); |
| 1086 | |
| 1087 | release: |
| 1088 | sbunlock(&so->so_snd); |
| 1089 | out: |
| 1090 | sounlock(so); |
| 1091 | splx(s); |
| 1092 | if (top) |
| 1093 | m_freem(top); |
| 1094 | if (control) |
| 1095 | m_freem(control); |
| 1096 | return (error); |
| 1097 | } |
| 1098 | |
| 1099 | /* |
| 1100 | * Following replacement or removal of the first mbuf on the first |
| 1101 | * mbuf chain of a socket buffer, push necessary state changes back |
| 1102 | * into the socket buffer so that other consumers see the values |
| 1103 | * consistently. 'nextrecord' is the callers locally stored value of |
| 1104 | * the original value of sb->sb_mb->m_nextpkt which must be restored |
| 1105 | * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL. |
| 1106 | */ |
| 1107 | static void |
| 1108 | sbsync(struct sockbuf *sb, struct mbuf *nextrecord) |
| 1109 | { |
| 1110 | |
| 1111 | KASSERT(solocked(sb->sb_so)); |
| 1112 | |
| 1113 | /* |
| 1114 | * First, update for the new value of nextrecord. If necessary, |
| 1115 | * make it the first record. |
| 1116 | */ |
| 1117 | if (sb->sb_mb != NULL) |
| 1118 | sb->sb_mb->m_nextpkt = nextrecord; |
| 1119 | else |
| 1120 | sb->sb_mb = nextrecord; |
| 1121 | |
| 1122 | /* |
| 1123 | * Now update any dependent socket buffer fields to reflect |
| 1124 | * the new state. This is an inline of SB_EMPTY_FIXUP, with |
| 1125 | * the addition of a second clause that takes care of the |
| 1126 | * case where sb_mb has been updated, but remains the last |
| 1127 | * record. |
| 1128 | */ |
| 1129 | if (sb->sb_mb == NULL) { |
| 1130 | sb->sb_mbtail = NULL; |
| 1131 | sb->sb_lastrecord = NULL; |
| 1132 | } else if (sb->sb_mb->m_nextpkt == NULL) |
| 1133 | sb->sb_lastrecord = sb->sb_mb; |
| 1134 | } |
| 1135 | |
| 1136 | /* |
| 1137 | * Implement receive operations on a socket. |
| 1138 | * We depend on the way that records are added to the sockbuf |
| 1139 | * by sbappend*. In particular, each record (mbufs linked through m_next) |
| 1140 | * must begin with an address if the protocol so specifies, |
| 1141 | * followed by an optional mbuf or mbufs containing ancillary data, |
| 1142 | * and then zero or more mbufs of data. |
| 1143 | * In order to avoid blocking network interrupts for the entire time here, |
| 1144 | * we splx() while doing the actual copy to user space. |
| 1145 | * Although the sockbuf is locked, new data may still be appended, |
| 1146 | * and thus we must maintain consistency of the sockbuf during that time. |
| 1147 | * |
| 1148 | * The caller may receive the data as a single mbuf chain by supplying |
| 1149 | * an mbuf **mp0 for use in returning the chain. The uio is then used |
| 1150 | * only for the count in uio_resid. |
| 1151 | */ |
| 1152 | int |
| 1153 | soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio, |
| 1154 | struct mbuf **mp0, struct mbuf **controlp, int *flagsp) |
| 1155 | { |
| 1156 | struct lwp *l = curlwp; |
| 1157 | struct mbuf *m, **mp, *mt; |
| 1158 | size_t len, offset, moff, orig_resid; |
| 1159 | int atomic, flags, error, s, type; |
| 1160 | const struct protosw *pr; |
| 1161 | struct mbuf *nextrecord; |
| 1162 | int mbuf_removed = 0; |
| 1163 | const struct domain *dom; |
| 1164 | short wakeup_state = 0; |
| 1165 | |
| 1166 | pr = so->so_proto; |
| 1167 | atomic = pr->pr_flags & PR_ATOMIC; |
| 1168 | dom = pr->pr_domain; |
| 1169 | mp = mp0; |
| 1170 | type = 0; |
| 1171 | orig_resid = uio->uio_resid; |
| 1172 | |
| 1173 | if (paddr != NULL) |
| 1174 | *paddr = NULL; |
| 1175 | if (controlp != NULL) |
| 1176 | *controlp = NULL; |
| 1177 | if (flagsp != NULL) |
| 1178 | flags = *flagsp &~ MSG_EOR; |
| 1179 | else |
| 1180 | flags = 0; |
| 1181 | |
| 1182 | if (flags & MSG_OOB) { |
| 1183 | m = m_get(M_WAIT, MT_DATA); |
| 1184 | solock(so); |
| 1185 | error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK); |
| 1186 | sounlock(so); |
| 1187 | if (error) |
| 1188 | goto bad; |
| 1189 | do { |
| 1190 | error = uiomove(mtod(m, void *), |
| 1191 | MIN(uio->uio_resid, m->m_len), uio); |
| 1192 | m = m_free(m); |
| 1193 | } while (uio->uio_resid > 0 && error == 0 && m); |
| 1194 | bad: |
| 1195 | if (m != NULL) |
| 1196 | m_freem(m); |
| 1197 | return error; |
| 1198 | } |
| 1199 | if (mp != NULL) |
| 1200 | *mp = NULL; |
| 1201 | |
| 1202 | /* |
| 1203 | * solock() provides atomicity of access. splsoftnet() prevents |
| 1204 | * protocol processing soft interrupts from interrupting us and |
| 1205 | * blocking (expensive). |
| 1206 | */ |
| 1207 | s = splsoftnet(); |
| 1208 | solock(so); |
| 1209 | restart: |
| 1210 | if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) { |
| 1211 | sounlock(so); |
| 1212 | splx(s); |
| 1213 | return error; |
| 1214 | } |
| 1215 | |
| 1216 | m = so->so_rcv.sb_mb; |
| 1217 | /* |
| 1218 | * If we have less data than requested, block awaiting more |
| 1219 | * (subject to any timeout) if: |
| 1220 | * 1. the current count is less than the low water mark, |
| 1221 | * 2. MSG_WAITALL is set, and it is possible to do the entire |
| 1222 | * receive operation at once if we block (resid <= hiwat), or |
| 1223 | * 3. MSG_DONTWAIT is not set. |
| 1224 | * If MSG_WAITALL is set but resid is larger than the receive buffer, |
| 1225 | * we have to do the receive in sections, and thus risk returning |
| 1226 | * a short count if a timeout or signal occurs after we start. |
| 1227 | */ |
| 1228 | if (m == NULL || |
| 1229 | ((flags & MSG_DONTWAIT) == 0 && |
| 1230 | so->so_rcv.sb_cc < uio->uio_resid && |
| 1231 | (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || |
| 1232 | ((flags & MSG_WAITALL) && |
| 1233 | uio->uio_resid <= so->so_rcv.sb_hiwat)) && |
| 1234 | m->m_nextpkt == NULL && !atomic)) { |
| 1235 | #ifdef DIAGNOSTIC |
| 1236 | if (m == NULL && so->so_rcv.sb_cc) |
| 1237 | panic("receive 1" ); |
| 1238 | #endif |
| 1239 | if (so->so_error) { |
| 1240 | if (m != NULL) |
| 1241 | goto dontblock; |
| 1242 | error = so->so_error; |
| 1243 | if ((flags & MSG_PEEK) == 0) |
| 1244 | so->so_error = 0; |
| 1245 | goto release; |
| 1246 | } |
| 1247 | if (so->so_state & SS_CANTRCVMORE) { |
| 1248 | if (m != NULL) |
| 1249 | goto dontblock; |
| 1250 | else |
| 1251 | goto release; |
| 1252 | } |
| 1253 | for (; m != NULL; m = m->m_next) |
| 1254 | if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { |
| 1255 | m = so->so_rcv.sb_mb; |
| 1256 | goto dontblock; |
| 1257 | } |
| 1258 | if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && |
| 1259 | (so->so_proto->pr_flags & PR_CONNREQUIRED)) { |
| 1260 | error = ENOTCONN; |
| 1261 | goto release; |
| 1262 | } |
| 1263 | if (uio->uio_resid == 0) |
| 1264 | goto release; |
| 1265 | if ((so->so_state & SS_NBIO) || |
| 1266 | (flags & (MSG_DONTWAIT|MSG_NBIO))) { |
| 1267 | error = EWOULDBLOCK; |
| 1268 | goto release; |
| 1269 | } |
| 1270 | SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1" ); |
| 1271 | SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1" ); |
| 1272 | sbunlock(&so->so_rcv); |
| 1273 | if (wakeup_state & SS_RESTARTSYS) |
| 1274 | error = ERESTART; |
| 1275 | else |
| 1276 | error = sbwait(&so->so_rcv); |
| 1277 | if (error != 0) { |
| 1278 | sounlock(so); |
| 1279 | splx(s); |
| 1280 | return error; |
| 1281 | } |
| 1282 | wakeup_state = so->so_state; |
| 1283 | goto restart; |
| 1284 | } |
| 1285 | dontblock: |
| 1286 | /* |
| 1287 | * On entry here, m points to the first record of the socket buffer. |
| 1288 | * From this point onward, we maintain 'nextrecord' as a cache of the |
| 1289 | * pointer to the next record in the socket buffer. We must keep the |
| 1290 | * various socket buffer pointers and local stack versions of the |
| 1291 | * pointers in sync, pushing out modifications before dropping the |
| 1292 | * socket lock, and re-reading them when picking it up. |
| 1293 | * |
| 1294 | * Otherwise, we will race with the network stack appending new data |
| 1295 | * or records onto the socket buffer by using inconsistent/stale |
| 1296 | * versions of the field, possibly resulting in socket buffer |
| 1297 | * corruption. |
| 1298 | * |
| 1299 | * By holding the high-level sblock(), we prevent simultaneous |
| 1300 | * readers from pulling off the front of the socket buffer. |
| 1301 | */ |
| 1302 | if (l != NULL) |
| 1303 | l->l_ru.ru_msgrcv++; |
| 1304 | KASSERT(m == so->so_rcv.sb_mb); |
| 1305 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 1" ); |
| 1306 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 1" ); |
| 1307 | nextrecord = m->m_nextpkt; |
| 1308 | if (pr->pr_flags & PR_ADDR) { |
| 1309 | #ifdef DIAGNOSTIC |
| 1310 | if (m->m_type != MT_SONAME) |
| 1311 | panic("receive 1a" ); |
| 1312 | #endif |
| 1313 | orig_resid = 0; |
| 1314 | if (flags & MSG_PEEK) { |
| 1315 | if (paddr) |
| 1316 | *paddr = m_copy(m, 0, m->m_len); |
| 1317 | m = m->m_next; |
| 1318 | } else { |
| 1319 | sbfree(&so->so_rcv, m); |
| 1320 | mbuf_removed = 1; |
| 1321 | if (paddr != NULL) { |
| 1322 | *paddr = m; |
| 1323 | so->so_rcv.sb_mb = m->m_next; |
| 1324 | m->m_next = NULL; |
| 1325 | m = so->so_rcv.sb_mb; |
| 1326 | } else { |
| 1327 | m = so->so_rcv.sb_mb = m_free(m); |
| 1328 | } |
| 1329 | sbsync(&so->so_rcv, nextrecord); |
| 1330 | } |
| 1331 | } |
| 1332 | if (pr->pr_flags & PR_ADDR_OPT) { |
| 1333 | /* |
| 1334 | * For SCTP we may be getting a |
| 1335 | * whole message OR a partial delivery. |
| 1336 | */ |
| 1337 | if (m->m_type == MT_SONAME) { |
| 1338 | orig_resid = 0; |
| 1339 | if (flags & MSG_PEEK) { |
| 1340 | if (paddr) |
| 1341 | *paddr = m_copy(m, 0, m->m_len); |
| 1342 | m = m->m_next; |
| 1343 | } else { |
| 1344 | sbfree(&so->so_rcv, m); |
| 1345 | if (paddr) { |
| 1346 | *paddr = m; |
| 1347 | so->so_rcv.sb_mb = m->m_next; |
| 1348 | m->m_next = 0; |
| 1349 | m = so->so_rcv.sb_mb; |
| 1350 | } else { |
| 1351 | m = so->so_rcv.sb_mb = m_free(m); |
| 1352 | } |
| 1353 | } |
| 1354 | } |
| 1355 | } |
| 1356 | |
| 1357 | /* |
| 1358 | * Process one or more MT_CONTROL mbufs present before any data mbufs |
| 1359 | * in the first mbuf chain on the socket buffer. If MSG_PEEK, we |
| 1360 | * just copy the data; if !MSG_PEEK, we call into the protocol to |
| 1361 | * perform externalization (or freeing if controlp == NULL). |
| 1362 | */ |
| 1363 | if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) { |
| 1364 | struct mbuf *cm = NULL, *cmn; |
| 1365 | struct mbuf **cme = &cm; |
| 1366 | |
| 1367 | do { |
| 1368 | if (flags & MSG_PEEK) { |
| 1369 | if (controlp != NULL) { |
| 1370 | *controlp = m_copy(m, 0, m->m_len); |
| 1371 | controlp = &(*controlp)->m_next; |
| 1372 | } |
| 1373 | m = m->m_next; |
| 1374 | } else { |
| 1375 | sbfree(&so->so_rcv, m); |
| 1376 | so->so_rcv.sb_mb = m->m_next; |
| 1377 | m->m_next = NULL; |
| 1378 | *cme = m; |
| 1379 | cme = &(*cme)->m_next; |
| 1380 | m = so->so_rcv.sb_mb; |
| 1381 | } |
| 1382 | } while (m != NULL && m->m_type == MT_CONTROL); |
| 1383 | if ((flags & MSG_PEEK) == 0) |
| 1384 | sbsync(&so->so_rcv, nextrecord); |
| 1385 | for (; cm != NULL; cm = cmn) { |
| 1386 | cmn = cm->m_next; |
| 1387 | cm->m_next = NULL; |
| 1388 | type = mtod(cm, struct cmsghdr *)->cmsg_type; |
| 1389 | if (controlp != NULL) { |
| 1390 | if (dom->dom_externalize != NULL && |
| 1391 | type == SCM_RIGHTS) { |
| 1392 | sounlock(so); |
| 1393 | splx(s); |
| 1394 | error = (*dom->dom_externalize)(cm, l, |
| 1395 | (flags & MSG_CMSG_CLOEXEC) ? |
| 1396 | O_CLOEXEC : 0); |
| 1397 | s = splsoftnet(); |
| 1398 | solock(so); |
| 1399 | } |
| 1400 | *controlp = cm; |
| 1401 | while (*controlp != NULL) |
| 1402 | controlp = &(*controlp)->m_next; |
| 1403 | } else { |
| 1404 | /* |
| 1405 | * Dispose of any SCM_RIGHTS message that went |
| 1406 | * through the read path rather than recv. |
| 1407 | */ |
| 1408 | if (dom->dom_dispose != NULL && |
| 1409 | type == SCM_RIGHTS) { |
| 1410 | sounlock(so); |
| 1411 | (*dom->dom_dispose)(cm); |
| 1412 | solock(so); |
| 1413 | } |
| 1414 | m_freem(cm); |
| 1415 | } |
| 1416 | } |
| 1417 | if (m != NULL) |
| 1418 | nextrecord = so->so_rcv.sb_mb->m_nextpkt; |
| 1419 | else |
| 1420 | nextrecord = so->so_rcv.sb_mb; |
| 1421 | orig_resid = 0; |
| 1422 | } |
| 1423 | |
| 1424 | /* If m is non-NULL, we have some data to read. */ |
| 1425 | if (__predict_true(m != NULL)) { |
| 1426 | type = m->m_type; |
| 1427 | if (type == MT_OOBDATA) |
| 1428 | flags |= MSG_OOB; |
| 1429 | } |
| 1430 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 2" ); |
| 1431 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 2" ); |
| 1432 | |
| 1433 | moff = 0; |
| 1434 | offset = 0; |
| 1435 | while (m != NULL && uio->uio_resid > 0 && error == 0) { |
| 1436 | if (m->m_type == MT_OOBDATA) { |
| 1437 | if (type != MT_OOBDATA) |
| 1438 | break; |
| 1439 | } else if (type == MT_OOBDATA) |
| 1440 | break; |
| 1441 | #ifdef DIAGNOSTIC |
| 1442 | else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) |
| 1443 | panic("receive 3" ); |
| 1444 | #endif |
| 1445 | so->so_state &= ~SS_RCVATMARK; |
| 1446 | wakeup_state = 0; |
| 1447 | len = uio->uio_resid; |
| 1448 | if (so->so_oobmark && len > so->so_oobmark - offset) |
| 1449 | len = so->so_oobmark - offset; |
| 1450 | if (len > m->m_len - moff) |
| 1451 | len = m->m_len - moff; |
| 1452 | /* |
| 1453 | * If mp is set, just pass back the mbufs. |
| 1454 | * Otherwise copy them out via the uio, then free. |
| 1455 | * Sockbuf must be consistent here (points to current mbuf, |
| 1456 | * it points to next record) when we drop priority; |
| 1457 | * we must note any additions to the sockbuf when we |
| 1458 | * block interrupts again. |
| 1459 | */ |
| 1460 | if (mp == NULL) { |
| 1461 | SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove" ); |
| 1462 | SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove" ); |
| 1463 | sounlock(so); |
| 1464 | splx(s); |
| 1465 | error = uiomove(mtod(m, char *) + moff, len, uio); |
| 1466 | s = splsoftnet(); |
| 1467 | solock(so); |
| 1468 | if (error != 0) { |
| 1469 | /* |
| 1470 | * If any part of the record has been removed |
| 1471 | * (such as the MT_SONAME mbuf, which will |
| 1472 | * happen when PR_ADDR, and thus also |
| 1473 | * PR_ATOMIC, is set), then drop the entire |
| 1474 | * record to maintain the atomicity of the |
| 1475 | * receive operation. |
| 1476 | * |
| 1477 | * This avoids a later panic("receive 1a") |
| 1478 | * when compiled with DIAGNOSTIC. |
| 1479 | */ |
| 1480 | if (m && mbuf_removed && atomic) |
| 1481 | (void) sbdroprecord(&so->so_rcv); |
| 1482 | |
| 1483 | goto release; |
| 1484 | } |
| 1485 | } else |
| 1486 | uio->uio_resid -= len; |
| 1487 | if (len == m->m_len - moff) { |
| 1488 | if (m->m_flags & M_EOR) |
| 1489 | flags |= MSG_EOR; |
| 1490 | #ifdef SCTP |
| 1491 | if (m->m_flags & M_NOTIFICATION) |
| 1492 | flags |= MSG_NOTIFICATION; |
| 1493 | #endif /* SCTP */ |
| 1494 | if (flags & MSG_PEEK) { |
| 1495 | m = m->m_next; |
| 1496 | moff = 0; |
| 1497 | } else { |
| 1498 | nextrecord = m->m_nextpkt; |
| 1499 | sbfree(&so->so_rcv, m); |
| 1500 | if (mp) { |
| 1501 | *mp = m; |
| 1502 | mp = &m->m_next; |
| 1503 | so->so_rcv.sb_mb = m = m->m_next; |
| 1504 | *mp = NULL; |
| 1505 | } else { |
| 1506 | m = so->so_rcv.sb_mb = m_free(m); |
| 1507 | } |
| 1508 | /* |
| 1509 | * If m != NULL, we also know that |
| 1510 | * so->so_rcv.sb_mb != NULL. |
| 1511 | */ |
| 1512 | KASSERT(so->so_rcv.sb_mb == m); |
| 1513 | if (m) { |
| 1514 | m->m_nextpkt = nextrecord; |
| 1515 | if (nextrecord == NULL) |
| 1516 | so->so_rcv.sb_lastrecord = m; |
| 1517 | } else { |
| 1518 | so->so_rcv.sb_mb = nextrecord; |
| 1519 | SB_EMPTY_FIXUP(&so->so_rcv); |
| 1520 | } |
| 1521 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 3" ); |
| 1522 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 3" ); |
| 1523 | } |
| 1524 | } else if (flags & MSG_PEEK) |
| 1525 | moff += len; |
| 1526 | else { |
| 1527 | if (mp != NULL) { |
| 1528 | mt = m_copym(m, 0, len, M_NOWAIT); |
| 1529 | if (__predict_false(mt == NULL)) { |
| 1530 | sounlock(so); |
| 1531 | mt = m_copym(m, 0, len, M_WAIT); |
| 1532 | solock(so); |
| 1533 | } |
| 1534 | *mp = mt; |
| 1535 | } |
| 1536 | m->m_data += len; |
| 1537 | m->m_len -= len; |
| 1538 | so->so_rcv.sb_cc -= len; |
| 1539 | } |
| 1540 | if (so->so_oobmark) { |
| 1541 | if ((flags & MSG_PEEK) == 0) { |
| 1542 | so->so_oobmark -= len; |
| 1543 | if (so->so_oobmark == 0) { |
| 1544 | so->so_state |= SS_RCVATMARK; |
| 1545 | break; |
| 1546 | } |
| 1547 | } else { |
| 1548 | offset += len; |
| 1549 | if (offset == so->so_oobmark) |
| 1550 | break; |
| 1551 | } |
| 1552 | } |
| 1553 | if (flags & MSG_EOR) |
| 1554 | break; |
| 1555 | /* |
| 1556 | * If the MSG_WAITALL flag is set (for non-atomic socket), |
| 1557 | * we must not quit until "uio->uio_resid == 0" or an error |
| 1558 | * termination. If a signal/timeout occurs, return |
| 1559 | * with a short count but without error. |
| 1560 | * Keep sockbuf locked against other readers. |
| 1561 | */ |
| 1562 | while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && |
| 1563 | !sosendallatonce(so) && !nextrecord) { |
| 1564 | if (so->so_error || so->so_state & SS_CANTRCVMORE) |
| 1565 | break; |
| 1566 | /* |
| 1567 | * If we are peeking and the socket receive buffer is |
| 1568 | * full, stop since we can't get more data to peek at. |
| 1569 | */ |
| 1570 | if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0) |
| 1571 | break; |
| 1572 | /* |
| 1573 | * If we've drained the socket buffer, tell the |
| 1574 | * protocol in case it needs to do something to |
| 1575 | * get it filled again. |
| 1576 | */ |
| 1577 | if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb) |
| 1578 | (*pr->pr_usrreqs->pr_rcvd)(so, flags, l); |
| 1579 | SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2" ); |
| 1580 | SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2" ); |
| 1581 | if (wakeup_state & SS_RESTARTSYS) |
| 1582 | error = ERESTART; |
| 1583 | else |
| 1584 | error = sbwait(&so->so_rcv); |
| 1585 | if (error != 0) { |
| 1586 | sbunlock(&so->so_rcv); |
| 1587 | sounlock(so); |
| 1588 | splx(s); |
| 1589 | return 0; |
| 1590 | } |
| 1591 | if ((m = so->so_rcv.sb_mb) != NULL) |
| 1592 | nextrecord = m->m_nextpkt; |
| 1593 | wakeup_state = so->so_state; |
| 1594 | } |
| 1595 | } |
| 1596 | |
| 1597 | if (m && atomic) { |
| 1598 | flags |= MSG_TRUNC; |
| 1599 | if ((flags & MSG_PEEK) == 0) |
| 1600 | (void) sbdroprecord(&so->so_rcv); |
| 1601 | } |
| 1602 | if ((flags & MSG_PEEK) == 0) { |
| 1603 | if (m == NULL) { |
| 1604 | /* |
| 1605 | * First part is an inline SB_EMPTY_FIXUP(). Second |
| 1606 | * part makes sure sb_lastrecord is up-to-date if |
| 1607 | * there is still data in the socket buffer. |
| 1608 | */ |
| 1609 | so->so_rcv.sb_mb = nextrecord; |
| 1610 | if (so->so_rcv.sb_mb == NULL) { |
| 1611 | so->so_rcv.sb_mbtail = NULL; |
| 1612 | so->so_rcv.sb_lastrecord = NULL; |
| 1613 | } else if (nextrecord->m_nextpkt == NULL) |
| 1614 | so->so_rcv.sb_lastrecord = nextrecord; |
| 1615 | } |
| 1616 | SBLASTRECORDCHK(&so->so_rcv, "soreceive 4" ); |
| 1617 | SBLASTMBUFCHK(&so->so_rcv, "soreceive 4" ); |
| 1618 | if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) |
| 1619 | (*pr->pr_usrreqs->pr_rcvd)(so, flags, l); |
| 1620 | } |
| 1621 | if (orig_resid == uio->uio_resid && orig_resid && |
| 1622 | (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { |
| 1623 | sbunlock(&so->so_rcv); |
| 1624 | goto restart; |
| 1625 | } |
| 1626 | |
| 1627 | if (flagsp != NULL) |
| 1628 | *flagsp |= flags; |
| 1629 | release: |
| 1630 | sbunlock(&so->so_rcv); |
| 1631 | sounlock(so); |
| 1632 | splx(s); |
| 1633 | return error; |
| 1634 | } |
| 1635 | |
| 1636 | int |
| 1637 | soshutdown(struct socket *so, int how) |
| 1638 | { |
| 1639 | const struct protosw *pr; |
| 1640 | int error; |
| 1641 | |
| 1642 | KASSERT(solocked(so)); |
| 1643 | |
| 1644 | pr = so->so_proto; |
| 1645 | if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR)) |
| 1646 | return (EINVAL); |
| 1647 | |
| 1648 | if (how == SHUT_RD || how == SHUT_RDWR) { |
| 1649 | sorflush(so); |
| 1650 | error = 0; |
| 1651 | } |
| 1652 | if (how == SHUT_WR || how == SHUT_RDWR) |
| 1653 | error = (*pr->pr_usrreqs->pr_shutdown)(so); |
| 1654 | |
| 1655 | return error; |
| 1656 | } |
| 1657 | |
| 1658 | void |
| 1659 | sorestart(struct socket *so) |
| 1660 | { |
| 1661 | /* |
| 1662 | * An application has called close() on an fd on which another |
| 1663 | * of its threads has called a socket system call. |
| 1664 | * Mark this and wake everyone up, and code that would block again |
| 1665 | * instead returns ERESTART. |
| 1666 | * On system call re-entry the fd is validated and EBADF returned. |
| 1667 | * Any other fd will block again on the 2nd syscall. |
| 1668 | */ |
| 1669 | solock(so); |
| 1670 | so->so_state |= SS_RESTARTSYS; |
| 1671 | cv_broadcast(&so->so_cv); |
| 1672 | cv_broadcast(&so->so_snd.sb_cv); |
| 1673 | cv_broadcast(&so->so_rcv.sb_cv); |
| 1674 | sounlock(so); |
| 1675 | } |
| 1676 | |
| 1677 | void |
| 1678 | sorflush(struct socket *so) |
| 1679 | { |
| 1680 | struct sockbuf *sb, asb; |
| 1681 | const struct protosw *pr; |
| 1682 | |
| 1683 | KASSERT(solocked(so)); |
| 1684 | |
| 1685 | sb = &so->so_rcv; |
| 1686 | pr = so->so_proto; |
| 1687 | socantrcvmore(so); |
| 1688 | sb->sb_flags |= SB_NOINTR; |
| 1689 | (void )sblock(sb, M_WAITOK); |
| 1690 | sbunlock(sb); |
| 1691 | asb = *sb; |
| 1692 | /* |
| 1693 | * Clear most of the sockbuf structure, but leave some of the |
| 1694 | * fields valid. |
| 1695 | */ |
| 1696 | memset(&sb->sb_startzero, 0, |
| 1697 | sizeof(*sb) - offsetof(struct sockbuf, sb_startzero)); |
| 1698 | if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) { |
| 1699 | sounlock(so); |
| 1700 | (*pr->pr_domain->dom_dispose)(asb.sb_mb); |
| 1701 | solock(so); |
| 1702 | } |
| 1703 | sbrelease(&asb, so); |
| 1704 | } |
| 1705 | |
| 1706 | /* |
| 1707 | * internal set SOL_SOCKET options |
| 1708 | */ |
| 1709 | static int |
| 1710 | sosetopt1(struct socket *so, const struct sockopt *sopt) |
| 1711 | { |
| 1712 | int error = EINVAL, opt; |
| 1713 | int optval = 0; /* XXX: gcc */ |
| 1714 | struct linger l; |
| 1715 | struct timeval tv; |
| 1716 | |
| 1717 | switch ((opt = sopt->sopt_name)) { |
| 1718 | |
| 1719 | case SO_ACCEPTFILTER: |
| 1720 | error = accept_filt_setopt(so, sopt); |
| 1721 | KASSERT(solocked(so)); |
| 1722 | break; |
| 1723 | |
| 1724 | case SO_LINGER: |
| 1725 | error = sockopt_get(sopt, &l, sizeof(l)); |
| 1726 | solock(so); |
| 1727 | if (error) |
| 1728 | break; |
| 1729 | if (l.l_linger < 0 || l.l_linger > USHRT_MAX || |
| 1730 | l.l_linger > (INT_MAX / hz)) { |
| 1731 | error = EDOM; |
| 1732 | break; |
| 1733 | } |
| 1734 | so->so_linger = l.l_linger; |
| 1735 | if (l.l_onoff) |
| 1736 | so->so_options |= SO_LINGER; |
| 1737 | else |
| 1738 | so->so_options &= ~SO_LINGER; |
| 1739 | break; |
| 1740 | |
| 1741 | case SO_DEBUG: |
| 1742 | case SO_KEEPALIVE: |
| 1743 | case SO_DONTROUTE: |
| 1744 | case SO_USELOOPBACK: |
| 1745 | case SO_BROADCAST: |
| 1746 | case SO_REUSEADDR: |
| 1747 | case SO_REUSEPORT: |
| 1748 | case SO_OOBINLINE: |
| 1749 | case SO_TIMESTAMP: |
| 1750 | case SO_NOSIGPIPE: |
| 1751 | #ifdef SO_OTIMESTAMP |
| 1752 | case SO_OTIMESTAMP: |
| 1753 | #endif |
| 1754 | error = sockopt_getint(sopt, &optval); |
| 1755 | solock(so); |
| 1756 | if (error) |
| 1757 | break; |
| 1758 | if (optval) |
| 1759 | so->so_options |= opt; |
| 1760 | else |
| 1761 | so->so_options &= ~opt; |
| 1762 | break; |
| 1763 | |
| 1764 | case SO_SNDBUF: |
| 1765 | case SO_RCVBUF: |
| 1766 | case SO_SNDLOWAT: |
| 1767 | case SO_RCVLOWAT: |
| 1768 | error = sockopt_getint(sopt, &optval); |
| 1769 | solock(so); |
| 1770 | if (error) |
| 1771 | break; |
| 1772 | |
| 1773 | /* |
| 1774 | * Values < 1 make no sense for any of these |
| 1775 | * options, so disallow them. |
| 1776 | */ |
| 1777 | if (optval < 1) { |
| 1778 | error = EINVAL; |
| 1779 | break; |
| 1780 | } |
| 1781 | |
| 1782 | switch (opt) { |
| 1783 | case SO_SNDBUF: |
| 1784 | if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) { |
| 1785 | error = ENOBUFS; |
| 1786 | break; |
| 1787 | } |
| 1788 | so->so_snd.sb_flags &= ~SB_AUTOSIZE; |
| 1789 | break; |
| 1790 | |
| 1791 | case SO_RCVBUF: |
| 1792 | if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) { |
| 1793 | error = ENOBUFS; |
| 1794 | break; |
| 1795 | } |
| 1796 | so->so_rcv.sb_flags &= ~SB_AUTOSIZE; |
| 1797 | break; |
| 1798 | |
| 1799 | /* |
| 1800 | * Make sure the low-water is never greater than |
| 1801 | * the high-water. |
| 1802 | */ |
| 1803 | case SO_SNDLOWAT: |
| 1804 | if (optval > so->so_snd.sb_hiwat) |
| 1805 | optval = so->so_snd.sb_hiwat; |
| 1806 | |
| 1807 | so->so_snd.sb_lowat = optval; |
| 1808 | break; |
| 1809 | |
| 1810 | case SO_RCVLOWAT: |
| 1811 | if (optval > so->so_rcv.sb_hiwat) |
| 1812 | optval = so->so_rcv.sb_hiwat; |
| 1813 | |
| 1814 | so->so_rcv.sb_lowat = optval; |
| 1815 | break; |
| 1816 | } |
| 1817 | break; |
| 1818 | |
| 1819 | #ifdef COMPAT_50 |
| 1820 | case SO_OSNDTIMEO: |
| 1821 | case SO_ORCVTIMEO: { |
| 1822 | struct timeval50 otv; |
| 1823 | error = sockopt_get(sopt, &otv, sizeof(otv)); |
| 1824 | if (error) { |
| 1825 | solock(so); |
| 1826 | break; |
| 1827 | } |
| 1828 | timeval50_to_timeval(&otv, &tv); |
| 1829 | opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO; |
| 1830 | error = 0; |
| 1831 | /*FALLTHROUGH*/ |
| 1832 | } |
| 1833 | #endif /* COMPAT_50 */ |
| 1834 | |
| 1835 | case SO_SNDTIMEO: |
| 1836 | case SO_RCVTIMEO: |
| 1837 | if (error) |
| 1838 | error = sockopt_get(sopt, &tv, sizeof(tv)); |
| 1839 | solock(so); |
| 1840 | if (error) |
| 1841 | break; |
| 1842 | |
| 1843 | if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) { |
| 1844 | error = EDOM; |
| 1845 | break; |
| 1846 | } |
| 1847 | |
| 1848 | optval = tv.tv_sec * hz + tv.tv_usec / tick; |
| 1849 | if (optval == 0 && tv.tv_usec != 0) |
| 1850 | optval = 1; |
| 1851 | |
| 1852 | switch (opt) { |
| 1853 | case SO_SNDTIMEO: |
| 1854 | so->so_snd.sb_timeo = optval; |
| 1855 | break; |
| 1856 | case SO_RCVTIMEO: |
| 1857 | so->so_rcv.sb_timeo = optval; |
| 1858 | break; |
| 1859 | } |
| 1860 | break; |
| 1861 | |
| 1862 | default: |
| 1863 | solock(so); |
| 1864 | error = ENOPROTOOPT; |
| 1865 | break; |
| 1866 | } |
| 1867 | KASSERT(solocked(so)); |
| 1868 | return error; |
| 1869 | } |
| 1870 | |
| 1871 | int |
| 1872 | sosetopt(struct socket *so, struct sockopt *sopt) |
| 1873 | { |
| 1874 | int error, prerr; |
| 1875 | |
| 1876 | if (sopt->sopt_level == SOL_SOCKET) { |
| 1877 | error = sosetopt1(so, sopt); |
| 1878 | KASSERT(solocked(so)); |
| 1879 | } else { |
| 1880 | error = ENOPROTOOPT; |
| 1881 | solock(so); |
| 1882 | } |
| 1883 | |
| 1884 | if ((error == 0 || error == ENOPROTOOPT) && |
| 1885 | so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) { |
| 1886 | /* give the protocol stack a shot */ |
| 1887 | prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt); |
| 1888 | if (prerr == 0) |
| 1889 | error = 0; |
| 1890 | else if (prerr != ENOPROTOOPT) |
| 1891 | error = prerr; |
| 1892 | } |
| 1893 | sounlock(so); |
| 1894 | return error; |
| 1895 | } |
| 1896 | |
| 1897 | /* |
| 1898 | * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt() |
| 1899 | */ |
| 1900 | int |
| 1901 | so_setsockopt(struct lwp *l, struct socket *so, int level, int name, |
| 1902 | const void *val, size_t valsize) |
| 1903 | { |
| 1904 | struct sockopt sopt; |
| 1905 | int error; |
| 1906 | |
| 1907 | KASSERT(valsize == 0 || val != NULL); |
| 1908 | |
| 1909 | sockopt_init(&sopt, level, name, valsize); |
| 1910 | sockopt_set(&sopt, val, valsize); |
| 1911 | |
| 1912 | error = sosetopt(so, &sopt); |
| 1913 | |
| 1914 | sockopt_destroy(&sopt); |
| 1915 | |
| 1916 | return error; |
| 1917 | } |
| 1918 | |
| 1919 | /* |
| 1920 | * internal get SOL_SOCKET options |
| 1921 | */ |
| 1922 | static int |
| 1923 | sogetopt1(struct socket *so, struct sockopt *sopt) |
| 1924 | { |
| 1925 | int error, optval, opt; |
| 1926 | struct linger l; |
| 1927 | struct timeval tv; |
| 1928 | |
| 1929 | switch ((opt = sopt->sopt_name)) { |
| 1930 | |
| 1931 | case SO_ACCEPTFILTER: |
| 1932 | error = accept_filt_getopt(so, sopt); |
| 1933 | break; |
| 1934 | |
| 1935 | case SO_LINGER: |
| 1936 | l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0; |
| 1937 | l.l_linger = so->so_linger; |
| 1938 | |
| 1939 | error = sockopt_set(sopt, &l, sizeof(l)); |
| 1940 | break; |
| 1941 | |
| 1942 | case SO_USELOOPBACK: |
| 1943 | case SO_DONTROUTE: |
| 1944 | case SO_DEBUG: |
| 1945 | case SO_KEEPALIVE: |
| 1946 | case SO_REUSEADDR: |
| 1947 | case SO_REUSEPORT: |
| 1948 | case SO_BROADCAST: |
| 1949 | case SO_OOBINLINE: |
| 1950 | case SO_TIMESTAMP: |
| 1951 | case SO_NOSIGPIPE: |
| 1952 | #ifdef SO_OTIMESTAMP |
| 1953 | case SO_OTIMESTAMP: |
| 1954 | #endif |
| 1955 | case SO_ACCEPTCONN: |
| 1956 | error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0); |
| 1957 | break; |
| 1958 | |
| 1959 | case SO_TYPE: |
| 1960 | error = sockopt_setint(sopt, so->so_type); |
| 1961 | break; |
| 1962 | |
| 1963 | case SO_ERROR: |
| 1964 | error = sockopt_setint(sopt, so->so_error); |
| 1965 | so->so_error = 0; |
| 1966 | break; |
| 1967 | |
| 1968 | case SO_SNDBUF: |
| 1969 | error = sockopt_setint(sopt, so->so_snd.sb_hiwat); |
| 1970 | break; |
| 1971 | |
| 1972 | case SO_RCVBUF: |
| 1973 | error = sockopt_setint(sopt, so->so_rcv.sb_hiwat); |
| 1974 | break; |
| 1975 | |
| 1976 | case SO_SNDLOWAT: |
| 1977 | error = sockopt_setint(sopt, so->so_snd.sb_lowat); |
| 1978 | break; |
| 1979 | |
| 1980 | case SO_RCVLOWAT: |
| 1981 | error = sockopt_setint(sopt, so->so_rcv.sb_lowat); |
| 1982 | break; |
| 1983 | |
| 1984 | #ifdef COMPAT_50 |
| 1985 | case SO_OSNDTIMEO: |
| 1986 | case SO_ORCVTIMEO: { |
| 1987 | struct timeval50 otv; |
| 1988 | |
| 1989 | optval = (opt == SO_OSNDTIMEO ? |
| 1990 | so->so_snd.sb_timeo : so->so_rcv.sb_timeo); |
| 1991 | |
| 1992 | otv.tv_sec = optval / hz; |
| 1993 | otv.tv_usec = (optval % hz) * tick; |
| 1994 | |
| 1995 | error = sockopt_set(sopt, &otv, sizeof(otv)); |
| 1996 | break; |
| 1997 | } |
| 1998 | #endif /* COMPAT_50 */ |
| 1999 | |
| 2000 | case SO_SNDTIMEO: |
| 2001 | case SO_RCVTIMEO: |
| 2002 | optval = (opt == SO_SNDTIMEO ? |
| 2003 | so->so_snd.sb_timeo : so->so_rcv.sb_timeo); |
| 2004 | |
| 2005 | tv.tv_sec = optval / hz; |
| 2006 | tv.tv_usec = (optval % hz) * tick; |
| 2007 | |
| 2008 | error = sockopt_set(sopt, &tv, sizeof(tv)); |
| 2009 | break; |
| 2010 | |
| 2011 | case SO_OVERFLOWED: |
| 2012 | error = sockopt_setint(sopt, so->so_rcv.sb_overflowed); |
| 2013 | break; |
| 2014 | |
| 2015 | default: |
| 2016 | error = ENOPROTOOPT; |
| 2017 | break; |
| 2018 | } |
| 2019 | |
| 2020 | return (error); |
| 2021 | } |
| 2022 | |
| 2023 | int |
| 2024 | sogetopt(struct socket *so, struct sockopt *sopt) |
| 2025 | { |
| 2026 | int error; |
| 2027 | |
| 2028 | solock(so); |
| 2029 | if (sopt->sopt_level != SOL_SOCKET) { |
| 2030 | if (so->so_proto && so->so_proto->pr_ctloutput) { |
| 2031 | error = ((*so->so_proto->pr_ctloutput) |
| 2032 | (PRCO_GETOPT, so, sopt)); |
| 2033 | } else |
| 2034 | error = (ENOPROTOOPT); |
| 2035 | } else { |
| 2036 | error = sogetopt1(so, sopt); |
| 2037 | } |
| 2038 | sounlock(so); |
| 2039 | return (error); |
| 2040 | } |
| 2041 | |
| 2042 | /* |
| 2043 | * alloc sockopt data buffer buffer |
| 2044 | * - will be released at destroy |
| 2045 | */ |
| 2046 | static int |
| 2047 | sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag) |
| 2048 | { |
| 2049 | |
| 2050 | KASSERT(sopt->sopt_size == 0); |
| 2051 | |
| 2052 | if (len > sizeof(sopt->sopt_buf)) { |
| 2053 | sopt->sopt_data = kmem_zalloc(len, kmflag); |
| 2054 | if (sopt->sopt_data == NULL) |
| 2055 | return ENOMEM; |
| 2056 | } else |
| 2057 | sopt->sopt_data = sopt->sopt_buf; |
| 2058 | |
| 2059 | sopt->sopt_size = len; |
| 2060 | return 0; |
| 2061 | } |
| 2062 | |
| 2063 | /* |
| 2064 | * initialise sockopt storage |
| 2065 | * - MAY sleep during allocation |
| 2066 | */ |
| 2067 | void |
| 2068 | sockopt_init(struct sockopt *sopt, int level, int name, size_t size) |
| 2069 | { |
| 2070 | |
| 2071 | memset(sopt, 0, sizeof(*sopt)); |
| 2072 | |
| 2073 | sopt->sopt_level = level; |
| 2074 | sopt->sopt_name = name; |
| 2075 | (void)sockopt_alloc(sopt, size, KM_SLEEP); |
| 2076 | } |
| 2077 | |
| 2078 | /* |
| 2079 | * destroy sockopt storage |
| 2080 | * - will release any held memory references |
| 2081 | */ |
| 2082 | void |
| 2083 | sockopt_destroy(struct sockopt *sopt) |
| 2084 | { |
| 2085 | |
| 2086 | if (sopt->sopt_data != sopt->sopt_buf) |
| 2087 | kmem_free(sopt->sopt_data, sopt->sopt_size); |
| 2088 | |
| 2089 | memset(sopt, 0, sizeof(*sopt)); |
| 2090 | } |
| 2091 | |
| 2092 | /* |
| 2093 | * set sockopt value |
| 2094 | * - value is copied into sockopt |
| 2095 | * - memory is allocated when necessary, will not sleep |
| 2096 | */ |
| 2097 | int |
| 2098 | sockopt_set(struct sockopt *sopt, const void *buf, size_t len) |
| 2099 | { |
| 2100 | int error; |
| 2101 | |
| 2102 | if (sopt->sopt_size == 0) { |
| 2103 | error = sockopt_alloc(sopt, len, KM_NOSLEEP); |
| 2104 | if (error) |
| 2105 | return error; |
| 2106 | } |
| 2107 | |
| 2108 | KASSERT(sopt->sopt_size == len); |
| 2109 | memcpy(sopt->sopt_data, buf, len); |
| 2110 | return 0; |
| 2111 | } |
| 2112 | |
| 2113 | /* |
| 2114 | * common case of set sockopt integer value |
| 2115 | */ |
| 2116 | int |
| 2117 | sockopt_setint(struct sockopt *sopt, int val) |
| 2118 | { |
| 2119 | |
| 2120 | return sockopt_set(sopt, &val, sizeof(int)); |
| 2121 | } |
| 2122 | |
| 2123 | /* |
| 2124 | * get sockopt value |
| 2125 | * - correct size must be given |
| 2126 | */ |
| 2127 | int |
| 2128 | sockopt_get(const struct sockopt *sopt, void *buf, size_t len) |
| 2129 | { |
| 2130 | |
| 2131 | if (sopt->sopt_size != len) |
| 2132 | return EINVAL; |
| 2133 | |
| 2134 | memcpy(buf, sopt->sopt_data, len); |
| 2135 | return 0; |
| 2136 | } |
| 2137 | |
| 2138 | /* |
| 2139 | * common case of get sockopt integer value |
| 2140 | */ |
| 2141 | int |
| 2142 | sockopt_getint(const struct sockopt *sopt, int *valp) |
| 2143 | { |
| 2144 | |
| 2145 | return sockopt_get(sopt, valp, sizeof(int)); |
| 2146 | } |
| 2147 | |
| 2148 | /* |
| 2149 | * set sockopt value from mbuf |
| 2150 | * - ONLY for legacy code |
| 2151 | * - mbuf is released by sockopt |
| 2152 | * - will not sleep |
| 2153 | */ |
| 2154 | int |
| 2155 | sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m) |
| 2156 | { |
| 2157 | size_t len; |
| 2158 | int error; |
| 2159 | |
| 2160 | len = m_length(m); |
| 2161 | |
| 2162 | if (sopt->sopt_size == 0) { |
| 2163 | error = sockopt_alloc(sopt, len, KM_NOSLEEP); |
| 2164 | if (error) |
| 2165 | return error; |
| 2166 | } |
| 2167 | |
| 2168 | KASSERT(sopt->sopt_size == len); |
| 2169 | m_copydata(m, 0, len, sopt->sopt_data); |
| 2170 | m_freem(m); |
| 2171 | |
| 2172 | return 0; |
| 2173 | } |
| 2174 | |
| 2175 | /* |
| 2176 | * get sockopt value into mbuf |
| 2177 | * - ONLY for legacy code |
| 2178 | * - mbuf to be released by the caller |
| 2179 | * - will not sleep |
| 2180 | */ |
| 2181 | struct mbuf * |
| 2182 | sockopt_getmbuf(const struct sockopt *sopt) |
| 2183 | { |
| 2184 | struct mbuf *m; |
| 2185 | |
| 2186 | if (sopt->sopt_size > MCLBYTES) |
| 2187 | return NULL; |
| 2188 | |
| 2189 | m = m_get(M_DONTWAIT, MT_SOOPTS); |
| 2190 | if (m == NULL) |
| 2191 | return NULL; |
| 2192 | |
| 2193 | if (sopt->sopt_size > MLEN) { |
| 2194 | MCLGET(m, M_DONTWAIT); |
| 2195 | if ((m->m_flags & M_EXT) == 0) { |
| 2196 | m_free(m); |
| 2197 | return NULL; |
| 2198 | } |
| 2199 | } |
| 2200 | |
| 2201 | memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size); |
| 2202 | m->m_len = sopt->sopt_size; |
| 2203 | |
| 2204 | return m; |
| 2205 | } |
| 2206 | |
| 2207 | void |
| 2208 | sohasoutofband(struct socket *so) |
| 2209 | { |
| 2210 | |
| 2211 | fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so); |
| 2212 | selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT); |
| 2213 | } |
| 2214 | |
| 2215 | static void |
| 2216 | filt_sordetach(struct knote *kn) |
| 2217 | { |
| 2218 | struct socket *so; |
| 2219 | |
| 2220 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2221 | solock(so); |
| 2222 | SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); |
| 2223 | if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) |
| 2224 | so->so_rcv.sb_flags &= ~SB_KNOTE; |
| 2225 | sounlock(so); |
| 2226 | } |
| 2227 | |
| 2228 | /*ARGSUSED*/ |
| 2229 | static int |
| 2230 | filt_soread(struct knote *kn, long hint) |
| 2231 | { |
| 2232 | struct socket *so; |
| 2233 | int rv; |
| 2234 | |
| 2235 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2236 | if (hint != NOTE_SUBMIT) |
| 2237 | solock(so); |
| 2238 | kn->kn_data = so->so_rcv.sb_cc; |
| 2239 | if (so->so_state & SS_CANTRCVMORE) { |
| 2240 | kn->kn_flags |= EV_EOF; |
| 2241 | kn->kn_fflags = so->so_error; |
| 2242 | rv = 1; |
| 2243 | } else if (so->so_error) /* temporary udp error */ |
| 2244 | rv = 1; |
| 2245 | else if (kn->kn_sfflags & NOTE_LOWAT) |
| 2246 | rv = (kn->kn_data >= kn->kn_sdata); |
| 2247 | else |
| 2248 | rv = (kn->kn_data >= so->so_rcv.sb_lowat); |
| 2249 | if (hint != NOTE_SUBMIT) |
| 2250 | sounlock(so); |
| 2251 | return rv; |
| 2252 | } |
| 2253 | |
| 2254 | static void |
| 2255 | filt_sowdetach(struct knote *kn) |
| 2256 | { |
| 2257 | struct socket *so; |
| 2258 | |
| 2259 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2260 | solock(so); |
| 2261 | SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext); |
| 2262 | if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist)) |
| 2263 | so->so_snd.sb_flags &= ~SB_KNOTE; |
| 2264 | sounlock(so); |
| 2265 | } |
| 2266 | |
| 2267 | /*ARGSUSED*/ |
| 2268 | static int |
| 2269 | filt_sowrite(struct knote *kn, long hint) |
| 2270 | { |
| 2271 | struct socket *so; |
| 2272 | int rv; |
| 2273 | |
| 2274 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2275 | if (hint != NOTE_SUBMIT) |
| 2276 | solock(so); |
| 2277 | kn->kn_data = sbspace(&so->so_snd); |
| 2278 | if (so->so_state & SS_CANTSENDMORE) { |
| 2279 | kn->kn_flags |= EV_EOF; |
| 2280 | kn->kn_fflags = so->so_error; |
| 2281 | rv = 1; |
| 2282 | } else if (so->so_error) /* temporary udp error */ |
| 2283 | rv = 1; |
| 2284 | else if (((so->so_state & SS_ISCONNECTED) == 0) && |
| 2285 | (so->so_proto->pr_flags & PR_CONNREQUIRED)) |
| 2286 | rv = 0; |
| 2287 | else if (kn->kn_sfflags & NOTE_LOWAT) |
| 2288 | rv = (kn->kn_data >= kn->kn_sdata); |
| 2289 | else |
| 2290 | rv = (kn->kn_data >= so->so_snd.sb_lowat); |
| 2291 | if (hint != NOTE_SUBMIT) |
| 2292 | sounlock(so); |
| 2293 | return rv; |
| 2294 | } |
| 2295 | |
| 2296 | /*ARGSUSED*/ |
| 2297 | static int |
| 2298 | filt_solisten(struct knote *kn, long hint) |
| 2299 | { |
| 2300 | struct socket *so; |
| 2301 | int rv; |
| 2302 | |
| 2303 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2304 | |
| 2305 | /* |
| 2306 | * Set kn_data to number of incoming connections, not |
| 2307 | * counting partial (incomplete) connections. |
| 2308 | */ |
| 2309 | if (hint != NOTE_SUBMIT) |
| 2310 | solock(so); |
| 2311 | kn->kn_data = so->so_qlen; |
| 2312 | rv = (kn->kn_data > 0); |
| 2313 | if (hint != NOTE_SUBMIT) |
| 2314 | sounlock(so); |
| 2315 | return rv; |
| 2316 | } |
| 2317 | |
| 2318 | static const struct filterops solisten_filtops = |
| 2319 | { 1, NULL, filt_sordetach, filt_solisten }; |
| 2320 | static const struct filterops soread_filtops = |
| 2321 | { 1, NULL, filt_sordetach, filt_soread }; |
| 2322 | static const struct filterops sowrite_filtops = |
| 2323 | { 1, NULL, filt_sowdetach, filt_sowrite }; |
| 2324 | |
| 2325 | int |
| 2326 | soo_kqfilter(struct file *fp, struct knote *kn) |
| 2327 | { |
| 2328 | struct socket *so; |
| 2329 | struct sockbuf *sb; |
| 2330 | |
| 2331 | so = ((file_t *)kn->kn_obj)->f_socket; |
| 2332 | solock(so); |
| 2333 | switch (kn->kn_filter) { |
| 2334 | case EVFILT_READ: |
| 2335 | if (so->so_options & SO_ACCEPTCONN) |
| 2336 | kn->kn_fop = &solisten_filtops; |
| 2337 | else |
| 2338 | kn->kn_fop = &soread_filtops; |
| 2339 | sb = &so->so_rcv; |
| 2340 | break; |
| 2341 | case EVFILT_WRITE: |
| 2342 | kn->kn_fop = &sowrite_filtops; |
| 2343 | sb = &so->so_snd; |
| 2344 | break; |
| 2345 | default: |
| 2346 | sounlock(so); |
| 2347 | return (EINVAL); |
| 2348 | } |
| 2349 | SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext); |
| 2350 | sb->sb_flags |= SB_KNOTE; |
| 2351 | sounlock(so); |
| 2352 | return (0); |
| 2353 | } |
| 2354 | |
| 2355 | static int |
| 2356 | sodopoll(struct socket *so, int events) |
| 2357 | { |
| 2358 | int revents; |
| 2359 | |
| 2360 | revents = 0; |
| 2361 | |
| 2362 | if (events & (POLLIN | POLLRDNORM)) |
| 2363 | if (soreadable(so)) |
| 2364 | revents |= events & (POLLIN | POLLRDNORM); |
| 2365 | |
| 2366 | if (events & (POLLOUT | POLLWRNORM)) |
| 2367 | if (sowritable(so)) |
| 2368 | revents |= events & (POLLOUT | POLLWRNORM); |
| 2369 | |
| 2370 | if (events & (POLLPRI | POLLRDBAND)) |
| 2371 | if (so->so_oobmark || (so->so_state & SS_RCVATMARK)) |
| 2372 | revents |= events & (POLLPRI | POLLRDBAND); |
| 2373 | |
| 2374 | return revents; |
| 2375 | } |
| 2376 | |
| 2377 | int |
| 2378 | sopoll(struct socket *so, int events) |
| 2379 | { |
| 2380 | int revents = 0; |
| 2381 | |
| 2382 | #ifndef DIAGNOSTIC |
| 2383 | /* |
| 2384 | * Do a quick, unlocked check in expectation that the socket |
| 2385 | * will be ready for I/O. Don't do this check if DIAGNOSTIC, |
| 2386 | * as the solocked() assertions will fail. |
| 2387 | */ |
| 2388 | if ((revents = sodopoll(so, events)) != 0) |
| 2389 | return revents; |
| 2390 | #endif |
| 2391 | |
| 2392 | solock(so); |
| 2393 | if ((revents = sodopoll(so, events)) == 0) { |
| 2394 | if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) { |
| 2395 | selrecord(curlwp, &so->so_rcv.sb_sel); |
| 2396 | so->so_rcv.sb_flags |= SB_NOTIFY; |
| 2397 | } |
| 2398 | |
| 2399 | if (events & (POLLOUT | POLLWRNORM)) { |
| 2400 | selrecord(curlwp, &so->so_snd.sb_sel); |
| 2401 | so->so_snd.sb_flags |= SB_NOTIFY; |
| 2402 | } |
| 2403 | } |
| 2404 | sounlock(so); |
| 2405 | |
| 2406 | return revents; |
| 2407 | } |
| 2408 | |
| 2409 | |
| 2410 | #include <sys/sysctl.h> |
| 2411 | |
| 2412 | static int sysctl_kern_somaxkva(SYSCTLFN_PROTO); |
| 2413 | static int sysctl_kern_sbmax(SYSCTLFN_PROTO); |
| 2414 | |
| 2415 | /* |
| 2416 | * sysctl helper routine for kern.somaxkva. ensures that the given |
| 2417 | * value is not too small. |
| 2418 | * (XXX should we maybe make sure it's not too large as well?) |
| 2419 | */ |
| 2420 | static int |
| 2421 | sysctl_kern_somaxkva(SYSCTLFN_ARGS) |
| 2422 | { |
| 2423 | int error, new_somaxkva; |
| 2424 | struct sysctlnode node; |
| 2425 | |
| 2426 | new_somaxkva = somaxkva; |
| 2427 | node = *rnode; |
| 2428 | node.sysctl_data = &new_somaxkva; |
| 2429 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 2430 | if (error || newp == NULL) |
| 2431 | return (error); |
| 2432 | |
| 2433 | if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */ |
| 2434 | return (EINVAL); |
| 2435 | |
| 2436 | mutex_enter(&so_pendfree_lock); |
| 2437 | somaxkva = new_somaxkva; |
| 2438 | cv_broadcast(&socurkva_cv); |
| 2439 | mutex_exit(&so_pendfree_lock); |
| 2440 | |
| 2441 | return (error); |
| 2442 | } |
| 2443 | |
| 2444 | /* |
| 2445 | * sysctl helper routine for kern.sbmax. Basically just ensures that |
| 2446 | * any new value is not too small. |
| 2447 | */ |
| 2448 | static int |
| 2449 | sysctl_kern_sbmax(SYSCTLFN_ARGS) |
| 2450 | { |
| 2451 | int error, new_sbmax; |
| 2452 | struct sysctlnode node; |
| 2453 | |
| 2454 | new_sbmax = sb_max; |
| 2455 | node = *rnode; |
| 2456 | node.sysctl_data = &new_sbmax; |
| 2457 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 2458 | if (error || newp == NULL) |
| 2459 | return (error); |
| 2460 | |
| 2461 | KERNEL_LOCK(1, NULL); |
| 2462 | error = sb_max_set(new_sbmax); |
| 2463 | KERNEL_UNLOCK_ONE(NULL); |
| 2464 | |
| 2465 | return (error); |
| 2466 | } |
| 2467 | |
| 2468 | static void |
| 2469 | sysctl_kern_socket_setup(void) |
| 2470 | { |
| 2471 | |
| 2472 | KASSERT(socket_sysctllog == NULL); |
| 2473 | |
| 2474 | sysctl_createv(&socket_sysctllog, 0, NULL, NULL, |
| 2475 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2476 | CTLTYPE_INT, "somaxkva" , |
| 2477 | SYSCTL_DESCR("Maximum amount of kernel memory to be " |
| 2478 | "used for socket buffers" ), |
| 2479 | sysctl_kern_somaxkva, 0, NULL, 0, |
| 2480 | CTL_KERN, KERN_SOMAXKVA, CTL_EOL); |
| 2481 | |
| 2482 | sysctl_createv(&socket_sysctllog, 0, NULL, NULL, |
| 2483 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2484 | CTLTYPE_INT, "sbmax" , |
| 2485 | SYSCTL_DESCR("Maximum socket buffer size" ), |
| 2486 | sysctl_kern_sbmax, 0, NULL, 0, |
| 2487 | CTL_KERN, KERN_SBMAX, CTL_EOL); |
| 2488 | } |
| 2489 | |