1 /* 2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/msgport.h> 38 #include <sys/protosw.h> 39 #include <sys/socket.h> 40 #include <sys/socketvar.h> 41 #include <sys/socketops.h> 42 #include <sys/thread.h> 43 #include <sys/thread2.h> 44 #include <sys/msgport2.h> 45 #include <sys/spinlock2.h> 46 #include <sys/sysctl.h> 47 #include <sys/mbuf.h> 48 #include <vm/pmap.h> 49 50 #include <net/netmsg2.h> 51 #include <sys/socketvar2.h> 52 53 #include <net/netisr.h> 54 #include <net/netmsg.h> 55 56 static int async_rcvd_drop_race = 0; 57 SYSCTL_INT(_kern_ipc, OID_AUTO, async_rcvd_drop_race, CTLFLAG_RW, 58 &async_rcvd_drop_race, 0, "# of asynchronized pru_rcvd msg drop races"); 59 60 /* 61 * Abort a socket and free it. Called from soabort() only. soabort() 62 * got a ref on the socket which we must free on reply. 63 */ 64 void 65 so_pru_abort(struct socket *so) 66 { 67 struct netmsg_pru_abort msg; 68 69 netmsg_init(&msg.base, so, &curthread->td_msgport, 70 0, so->so_proto->pr_usrreqs->pru_abort); 71 lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 72 sofree(msg.base.nm_so); 73 } 74 75 /* 76 * Abort a socket and free it, asynchronously. Called from 77 * soabort_async() only. soabort_async() got a ref on the 78 * socket which we must free on reply. 79 */ 80 void 81 so_pru_abort_async(struct socket *so) 82 { 83 struct netmsg_pru_abort *msg; 84 85 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_ZERO); 86 netmsg_init(&msg->base, so, &netisr_afree_free_so_rport, 87 0, so->so_proto->pr_usrreqs->pru_abort); 88 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 89 } 90 91 /* 92 * Abort a socket and free it. Called from soabort_oncpu() only. 93 * Caller must make sure that the current CPU is inpcb's owner CPU. 94 */ 95 void 96 so_pru_abort_direct(struct socket *so) 97 { 98 struct netmsg_pru_abort msg; 99 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_abort; 100 101 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 102 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 103 msg.base.lmsg.ms_flags |= MSGF_SYNC; 104 func((netmsg_t)&msg); 105 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 106 sofree(msg.base.nm_so); 107 } 108 109 int 110 so_pru_accept(struct socket *so, struct sockaddr **nam) 111 { 112 struct netmsg_pru_accept msg; 113 114 netmsg_init(&msg.base, so, &curthread->td_msgport, 115 0, so->so_proto->pr_usrreqs->pru_accept); 116 msg.nm_nam = nam; 117 118 return lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 119 } 120 121 int 122 so_pru_attach(struct socket *so, int proto, struct pru_attach_info *ai) 123 { 124 struct netmsg_pru_attach msg; 125 int error; 126 127 netmsg_init(&msg.base, so, &curthread->td_msgport, 128 0, so->so_proto->pr_usrreqs->pru_attach); 129 msg.nm_proto = proto; 130 msg.nm_ai = ai; 131 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 132 return (error); 133 } 134 135 int 136 so_pru_attach_direct(struct socket *so, int proto, struct pru_attach_info *ai) 137 { 138 struct netmsg_pru_attach msg; 139 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_attach; 140 141 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 142 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 143 msg.base.lmsg.ms_flags |= MSGF_SYNC; 144 msg.nm_proto = proto; 145 msg.nm_ai = ai; 146 func((netmsg_t)&msg); 147 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 148 return(msg.base.lmsg.ms_error); 149 } 150 151 /* 152 * NOTE: If the target port changes the bind operation will deal with it. 153 */ 154 int 155 so_pru_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 156 { 157 struct netmsg_pru_bind msg; 158 int error; 159 160 netmsg_init(&msg.base, so, &curthread->td_msgport, 161 0, so->so_proto->pr_usrreqs->pru_bind); 162 msg.nm_nam = nam; 163 msg.nm_td = td; /* used only for prison_ip() */ 164 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 165 return (error); 166 } 167 168 int 169 so_pru_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 170 { 171 struct netmsg_pru_connect msg; 172 int error; 173 174 netmsg_init(&msg.base, so, &curthread->td_msgport, 175 0, so->so_proto->pr_usrreqs->pru_connect); 176 msg.nm_nam = nam; 177 msg.nm_td = td; 178 msg.nm_m = NULL; 179 msg.nm_sndflags = 0; 180 msg.nm_flags = 0; 181 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 182 return (error); 183 } 184 185 int 186 so_pru_connect_async(struct socket *so, struct sockaddr *nam, struct thread *td) 187 { 188 struct netmsg_pru_connect *msg; 189 int error, flags; 190 191 KASSERT(so->so_proto->pr_usrreqs->pru_preconnect != NULL, 192 ("async pru_connect is not supported")); 193 194 /* NOTE: sockaddr immediately follows netmsg */ 195 msg = kmalloc(sizeof(*msg) + nam->sa_len, M_LWKTMSG, M_NOWAIT); 196 if (msg == NULL) { 197 /* 198 * Fail to allocate message w/o waiting; 199 * fallback to synchronized pru_connect. 200 */ 201 return so_pru_connect(so, nam, td); 202 } 203 204 error = so->so_proto->pr_usrreqs->pru_preconnect(so, nam, td); 205 if (error) { 206 kfree(msg, M_LWKTMSG); 207 return error; 208 } 209 210 flags = PRUC_ASYNC; 211 if (td != NULL && (so->so_proto->pr_flags & PR_ACONN_HOLDTD)) { 212 lwkt_hold(td); 213 flags |= PRUC_HELDTD; 214 } 215 216 netmsg_init(&msg->base, so, &netisr_afree_rport, 0, 217 so->so_proto->pr_usrreqs->pru_connect); 218 msg->nm_nam = (struct sockaddr *)(msg + 1); 219 memcpy(msg->nm_nam, nam, nam->sa_len); 220 msg->nm_td = td; 221 msg->nm_m = NULL; 222 msg->nm_sndflags = 0; 223 msg->nm_flags = flags; 224 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 225 return 0; 226 } 227 228 int 229 so_pru_connect2(struct socket *so1, struct socket *so2) 230 { 231 struct netmsg_pru_connect2 msg; 232 int error; 233 234 netmsg_init(&msg.base, so1, &curthread->td_msgport, 235 0, so1->so_proto->pr_usrreqs->pru_connect2); 236 msg.nm_so1 = so1; 237 msg.nm_so2 = so2; 238 error = lwkt_domsg(so1->so_port, &msg.base.lmsg, 0); 239 return (error); 240 } 241 242 /* 243 * WARNING! Synchronous call from user context. Control function may do 244 * copyin/copyout. 245 */ 246 int 247 so_pru_control_direct(struct socket *so, u_long cmd, caddr_t data, 248 struct ifnet *ifp) 249 { 250 struct netmsg_pru_control msg; 251 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_control; 252 253 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 254 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 255 msg.base.lmsg.ms_flags |= MSGF_SYNC; 256 msg.nm_cmd = cmd; 257 msg.nm_data = data; 258 msg.nm_ifp = ifp; 259 msg.nm_td = curthread; 260 func((netmsg_t)&msg); 261 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 262 return(msg.base.lmsg.ms_error); 263 } 264 265 int 266 so_pru_detach(struct socket *so) 267 { 268 struct netmsg_pru_detach msg; 269 int error; 270 271 netmsg_init(&msg.base, so, &curthread->td_msgport, 272 0, so->so_proto->pr_usrreqs->pru_detach); 273 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 274 return (error); 275 } 276 277 int 278 so_pru_detach_direct(struct socket *so) 279 { 280 struct netmsg_pru_detach msg; 281 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_detach; 282 283 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 284 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 285 msg.base.lmsg.ms_flags |= MSGF_SYNC; 286 func((netmsg_t)&msg); 287 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 288 return(msg.base.lmsg.ms_error); 289 } 290 291 int 292 so_pru_disconnect(struct socket *so) 293 { 294 struct netmsg_pru_disconnect msg; 295 int error; 296 297 netmsg_init(&msg.base, so, &curthread->td_msgport, 298 0, so->so_proto->pr_usrreqs->pru_disconnect); 299 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 300 return (error); 301 } 302 303 void 304 so_pru_disconnect_direct(struct socket *so) 305 { 306 struct netmsg_pru_disconnect msg; 307 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_disconnect; 308 309 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 310 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 311 msg.base.lmsg.ms_flags |= MSGF_SYNC; 312 func((netmsg_t)&msg); 313 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 314 } 315 316 int 317 so_pru_listen(struct socket *so, struct thread *td) 318 { 319 struct netmsg_pru_listen msg; 320 int error; 321 322 netmsg_init(&msg.base, so, &curthread->td_msgport, 323 0, so->so_proto->pr_usrreqs->pru_listen); 324 msg.nm_td = td; /* used only for prison_ip() XXX JH */ 325 msg.nm_flags = 0; 326 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 327 return (error); 328 } 329 330 int 331 so_pru_peeraddr(struct socket *so, struct sockaddr **nam) 332 { 333 struct netmsg_pru_peeraddr msg; 334 int error; 335 336 netmsg_init(&msg.base, so, &curthread->td_msgport, 337 0, so->so_proto->pr_usrreqs->pru_peeraddr); 338 msg.nm_nam = nam; 339 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 340 return (error); 341 } 342 343 int 344 so_pru_rcvd(struct socket *so, int flags) 345 { 346 struct netmsg_pru_rcvd msg; 347 int error; 348 349 netmsg_init(&msg.base, so, &curthread->td_msgport, 350 0, so->so_proto->pr_usrreqs->pru_rcvd); 351 msg.nm_flags = flags; 352 msg.nm_pru_flags = 0; 353 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 354 return (error); 355 } 356 357 void 358 so_pru_rcvd_async(struct socket *so) 359 { 360 lwkt_msg_t lmsg = &so->so_rcvd_msg.base.lmsg; 361 362 KASSERT(so->so_proto->pr_flags & PR_ASYNC_RCVD, 363 ("async pru_rcvd is not supported")); 364 365 /* 366 * WARNING! Spinlock is a bit dodgy, use hacked up sendmsg 367 * to avoid deadlocking. 368 */ 369 spin_lock(&so->so_rcvd_spin); 370 if ((so->so_rcvd_msg.nm_pru_flags & PRUR_DEAD) == 0) { 371 if (lmsg->ms_flags & MSGF_DONE) { 372 lwkt_sendmsg_prepare(so->so_port, lmsg); 373 spin_unlock(&so->so_rcvd_spin); 374 lwkt_sendmsg_start(so->so_port, lmsg); 375 } else { 376 spin_unlock(&so->so_rcvd_spin); 377 } 378 } else { 379 spin_unlock(&so->so_rcvd_spin); 380 } 381 } 382 383 int 384 so_pru_rcvoob(struct socket *so, struct mbuf *m, int flags) 385 { 386 struct netmsg_pru_rcvoob msg; 387 int error; 388 389 netmsg_init(&msg.base, so, &curthread->td_msgport, 390 0, so->so_proto->pr_usrreqs->pru_rcvoob); 391 msg.nm_m = m; 392 msg.nm_flags = flags; 393 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 394 return (error); 395 } 396 397 /* 398 * NOTE: If the target port changes the implied connect will deal with it. 399 */ 400 int 401 so_pru_send(struct socket *so, int flags, struct mbuf *m, 402 struct sockaddr *addr, struct mbuf *control, struct thread *td) 403 { 404 struct netmsg_pru_send msg; 405 int error; 406 407 netmsg_init(&msg.base, so, &curthread->td_msgport, 408 0, so->so_proto->pr_usrreqs->pru_send); 409 msg.nm_flags = flags; 410 msg.nm_m = m; 411 msg.nm_addr = addr; 412 msg.nm_control = control; 413 msg.nm_td = td; 414 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 415 return (error); 416 } 417 418 void 419 so_pru_sync(struct socket *so) 420 { 421 struct netmsg_base msg; 422 423 netmsg_init(&msg, so, &curthread->td_msgport, 0, 424 netmsg_sync_handler); 425 lwkt_domsg(so->so_port, &msg.lmsg, 0); 426 } 427 428 void 429 so_pru_send_async(struct socket *so, int flags, struct mbuf *m, 430 struct sockaddr *addr0, struct mbuf *control, struct thread *td) 431 { 432 struct netmsg_pru_send *msg; 433 struct sockaddr *addr = NULL; 434 435 KASSERT(so->so_proto->pr_flags & PR_ASYNC_SEND, 436 ("async pru_send is not supported")); 437 438 if (addr0 != NULL) { 439 addr = kmalloc(addr0->sa_len, M_SONAME, M_WAITOK | M_NULLOK); 440 if (addr == NULL) { 441 /* 442 * Fail to allocate address; fallback to 443 * synchronized pru_send. 444 */ 445 so_pru_send(so, flags, m, addr0, control, td); 446 return; 447 } 448 memcpy(addr, addr0, addr0->sa_len); 449 flags |= PRUS_FREEADDR; 450 } 451 flags |= PRUS_NOREPLY; 452 453 if (td != NULL && (so->so_proto->pr_flags & PR_ASEND_HOLDTD)) { 454 lwkt_hold(td); 455 flags |= PRUS_HELDTD; 456 } 457 458 msg = &m->m_hdr.mh_sndmsg; 459 netmsg_init(&msg->base, so, &netisr_apanic_rport, 460 0, so->so_proto->pr_usrreqs->pru_send); 461 msg->nm_flags = flags; 462 msg->nm_m = m; 463 msg->nm_addr = addr; 464 msg->nm_control = control; 465 msg->nm_td = td; 466 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 467 } 468 469 int 470 so_pru_sense(struct socket *so, struct stat *sb) 471 { 472 struct netmsg_pru_sense msg; 473 int error; 474 475 netmsg_init(&msg.base, so, &curthread->td_msgport, 476 0, so->so_proto->pr_usrreqs->pru_sense); 477 msg.nm_stat = sb; 478 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 479 return (error); 480 } 481 482 int 483 so_pru_shutdown(struct socket *so) 484 { 485 struct netmsg_pru_shutdown msg; 486 int error; 487 488 netmsg_init(&msg.base, so, &curthread->td_msgport, 489 0, so->so_proto->pr_usrreqs->pru_shutdown); 490 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 491 return (error); 492 } 493 494 int 495 so_pru_sockaddr(struct socket *so, struct sockaddr **nam) 496 { 497 struct netmsg_pru_sockaddr msg; 498 int error; 499 500 netmsg_init(&msg.base, so, &curthread->td_msgport, 501 0, so->so_proto->pr_usrreqs->pru_sockaddr); 502 msg.nm_nam = nam; 503 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 504 return (error); 505 } 506 507 int 508 so_pr_ctloutput(struct socket *so, struct sockopt *sopt) 509 { 510 struct netmsg_pr_ctloutput msg; 511 int error; 512 513 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 514 netmsg_init(&msg.base, so, &curthread->td_msgport, 515 0, so->so_proto->pr_ctloutput); 516 msg.nm_sopt = sopt; 517 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 518 return (error); 519 } 520 521 struct lwkt_port * 522 so_pr_ctlport(struct protosw *pr, int cmd, struct sockaddr *arg, 523 void *extra, int *cpuid) 524 { 525 if (pr->pr_ctlport == NULL) 526 return NULL; 527 KKASSERT(pr->pr_ctlinput != NULL); 528 529 return pr->pr_ctlport(cmd, arg, extra, cpuid); 530 } 531 532 /* 533 * Protocol control input, typically via icmp. 534 * 535 * If the protocol pr_ctlport is not NULL we call it to figure out the 536 * protocol port. If NULL is returned we can just return, otherwise 537 * we issue a netmsg to call pr_ctlinput in the proper thread. 538 * 539 * This must be done synchronously as arg and/or extra may point to 540 * temporary data. 541 */ 542 void 543 so_pr_ctlinput(struct protosw *pr, int cmd, struct sockaddr *arg, void *extra) 544 { 545 struct netmsg_pr_ctlinput msg; 546 lwkt_port_t port; 547 int cpuid; 548 549 port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid); 550 if (port == NULL) 551 return; 552 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 553 0, pr->pr_ctlinput); 554 msg.nm_cmd = cmd; 555 msg.nm_direct = 0; 556 msg.nm_arg = arg; 557 msg.nm_extra = extra; 558 lwkt_domsg(port, &msg.base.lmsg, 0); 559 } 560 561 void 562 so_pr_ctlinput_direct(struct protosw *pr, int cmd, struct sockaddr *arg, 563 void *extra) 564 { 565 struct netmsg_pr_ctlinput msg; 566 netisr_fn_t func; 567 lwkt_port_t port; 568 int cpuid; 569 570 port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid); 571 if (port == NULL) 572 return; 573 if (cpuid != ncpus && cpuid != mycpuid) 574 return; 575 576 func = pr->pr_ctlinput; 577 netmsg_init(&msg.base, NULL, &netisr_adone_rport, 0, func); 578 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 579 msg.base.lmsg.ms_flags |= MSGF_SYNC; 580 msg.nm_cmd = cmd; 581 msg.nm_direct = 1; 582 msg.nm_arg = arg; 583 msg.nm_extra = extra; 584 func((netmsg_t)&msg); 585 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 586 } 587 588 /* 589 * If we convert all the protosw pr_ functions for all the protocols 590 * to take a message directly, this layer can go away. For the moment 591 * our dispatcher ignores the return value, but since we are handling 592 * the replymsg ourselves we return EASYNC by convention. 593 */ 594 595 /* 596 * Handle a predicate event request. This function is only called once 597 * when the predicate message queueing request is received. 598 */ 599 void 600 netmsg_so_notify(netmsg_t msg) 601 { 602 struct lwkt_token *tok; 603 struct signalsockbuf *ssb; 604 605 ssb = (msg->notify.nm_etype & NM_REVENT) ? 606 &msg->base.nm_so->so_rcv : 607 &msg->base.nm_so->so_snd; 608 609 /* 610 * Reply immediately if the event has occured, otherwise queue the 611 * request. 612 * 613 * NOTE: Socket can change if this is an accept predicate so cache 614 * the token. 615 */ 616 tok = lwkt_token_pool_lookup(msg->base.nm_so); 617 lwkt_gettoken(tok); 618 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT); 619 if (msg->notify.nm_predicate(&msg->notify)) { 620 if (TAILQ_EMPTY(&ssb->ssb_kq.ki_mlist)) 621 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT); 622 lwkt_reltoken(tok); 623 lwkt_replymsg(&msg->base.lmsg, 624 msg->base.lmsg.ms_error); 625 } else { 626 TAILQ_INSERT_TAIL(&ssb->ssb_kq.ki_mlist, &msg->notify, nm_list); 627 /* 628 * NOTE: 629 * If predict ever blocks, 'tok' will be released, so 630 * SSB_MEVENT set beforehand could have been cleared 631 * when we reach here. In case that happens, we set 632 * SSB_MEVENT again, after the notify has been queued. 633 */ 634 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT); 635 lwkt_reltoken(tok); 636 } 637 } 638 639 /* 640 * Called by doio when trying to abort a netmsg_so_notify message. 641 * Unlike the other functions this one is dispatched directly by 642 * the LWKT subsystem, so it takes a lwkt_msg_t as an argument. 643 * 644 * The original message, lmsg, is under the control of the caller and 645 * will not be destroyed until we return so we can safely reference it 646 * in our synchronous abort request. 647 * 648 * This part of the abort request occurs on the originating cpu which 649 * means we may race the message flags and the original message may 650 * not even have been processed by the target cpu yet. 651 */ 652 void 653 netmsg_so_notify_doabort(lwkt_msg_t lmsg) 654 { 655 struct netmsg_so_notify_abort msg; 656 657 if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 658 const struct netmsg_base *nmsg = 659 (const struct netmsg_base *)lmsg; 660 661 netmsg_init(&msg.base, nmsg->nm_so, &curthread->td_msgport, 662 0, netmsg_so_notify_abort); 663 msg.nm_notifymsg = (void *)lmsg; 664 lwkt_domsg(lmsg->ms_target_port, &msg.base.lmsg, 0); 665 } 666 } 667 668 /* 669 * Predicate requests can be aborted. This function is only called once 670 * and will interlock against processing/reply races (since such races 671 * occur on the same thread that controls the port where the abort is 672 * requeued). 673 * 674 * This part of the abort request occurs on the target cpu. The message 675 * flags must be tested again in case the test that we did on the 676 * originating cpu raced. Since messages are handled in sequence, the 677 * original message will have already been handled by the loop and either 678 * replied to or queued. 679 * 680 * We really only need to interlock with MSGF_REPLY (a bit that is set on 681 * our cpu when we reply). Note that MSGF_DONE is not set until the 682 * reply reaches the originating cpu. Test both bits anyway. 683 */ 684 void 685 netmsg_so_notify_abort(netmsg_t msg) 686 { 687 struct netmsg_so_notify_abort *abrtmsg = &msg->notify_abort; 688 struct netmsg_so_notify *nmsg = abrtmsg->nm_notifymsg; 689 struct signalsockbuf *ssb; 690 691 /* 692 * The original notify message is not destroyed until after the 693 * abort request is returned, so we can check its state. 694 */ 695 lwkt_getpooltoken(nmsg->base.nm_so); 696 if ((nmsg->base.lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 697 ssb = (nmsg->nm_etype & NM_REVENT) ? 698 &nmsg->base.nm_so->so_rcv : 699 &nmsg->base.nm_so->so_snd; 700 TAILQ_REMOVE(&ssb->ssb_kq.ki_mlist, nmsg, nm_list); 701 lwkt_relpooltoken(nmsg->base.nm_so); 702 lwkt_replymsg(&nmsg->base.lmsg, EINTR); 703 } else { 704 lwkt_relpooltoken(nmsg->base.nm_so); 705 } 706 707 /* 708 * Reply to the abort message 709 */ 710 lwkt_replymsg(&abrtmsg->base.lmsg, 0); 711 } 712 713 void 714 so_async_rcvd_reply(struct socket *so) 715 { 716 /* 717 * Spinlock safe, reply runs to degenerate lwkt_null_replyport() 718 */ 719 spin_lock(&so->so_rcvd_spin); 720 lwkt_replymsg(&so->so_rcvd_msg.base.lmsg, 0); 721 spin_unlock(&so->so_rcvd_spin); 722 } 723 724 void 725 so_async_rcvd_drop(struct socket *so) 726 { 727 lwkt_msg_t lmsg = &so->so_rcvd_msg.base.lmsg; 728 729 /* 730 * Spinlock safe, drop runs to degenerate lwkt_spin_dropmsg() 731 */ 732 spin_lock(&so->so_rcvd_spin); 733 so->so_rcvd_msg.nm_pru_flags |= PRUR_DEAD; 734 again: 735 lwkt_dropmsg(lmsg); 736 if ((lmsg->ms_flags & MSGF_DONE) == 0) { 737 ++async_rcvd_drop_race; 738 ssleep(so, &so->so_rcvd_spin, 0, "soadrop", 1); 739 goto again; 740 } 741 spin_unlock(&so->so_rcvd_spin); 742 } 743