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, asynchronously. Called from 62 * soabort_async() only. soabort_async() got a ref on the 63 * socket which we must free on reply. 64 */ 65 void 66 so_pru_abort_async(struct socket *so) 67 { 68 struct netmsg_pru_abort *msg; 69 70 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_ZERO); 71 netmsg_init(&msg->base, so, &netisr_afree_free_so_rport, 72 0, so->so_proto->pr_usrreqs->pru_abort); 73 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 74 } 75 76 /* 77 * Abort a socket and free it. Called from soabort_direct() only. 78 * Caller must make sure that the current CPU is inpcb's owner CPU. 79 * soabort_direct() got a ref on the socket which we must free. 80 */ 81 void 82 so_pru_abort_direct(struct socket *so) 83 { 84 struct netmsg_pru_abort msg; 85 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_abort; 86 87 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 88 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 89 msg.base.lmsg.ms_flags |= MSGF_SYNC; 90 func((netmsg_t)&msg); 91 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 92 sofree(msg.base.nm_so); 93 } 94 95 int 96 so_pru_accept(struct socket *so, struct sockaddr **nam) 97 { 98 struct netmsg_pru_accept msg; 99 100 netmsg_init(&msg.base, so, &curthread->td_msgport, 101 0, so->so_proto->pr_usrreqs->pru_accept); 102 msg.nm_nam = nam; 103 104 return lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 105 } 106 107 int 108 so_pru_attach(struct socket *so, int proto, struct pru_attach_info *ai) 109 { 110 struct netmsg_pru_attach msg; 111 int error; 112 113 netmsg_init(&msg.base, so, &curthread->td_msgport, 114 0, so->so_proto->pr_usrreqs->pru_attach); 115 msg.nm_proto = proto; 116 msg.nm_ai = ai; 117 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 118 return (error); 119 } 120 121 int 122 so_pru_attach_direct(struct socket *so, int proto, struct pru_attach_info *ai) 123 { 124 struct netmsg_pru_attach msg; 125 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_attach; 126 127 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 128 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 129 msg.base.lmsg.ms_flags |= MSGF_SYNC; 130 msg.nm_proto = proto; 131 msg.nm_ai = ai; 132 func((netmsg_t)&msg); 133 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 134 return(msg.base.lmsg.ms_error); 135 } 136 137 int 138 so_pru_attach_fast(struct socket *so, int proto, struct pru_attach_info *ai) 139 { 140 struct netmsg_pru_attach *msg; 141 int error; 142 143 error = so->so_proto->pr_usrreqs->pru_preattach(so, proto, ai); 144 if (error) 145 return error; 146 147 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_NULLOK); 148 if (msg == NULL) { 149 /* 150 * Fail to allocate message; fallback to 151 * synchronized pru_attach. 152 */ 153 return so_pru_attach(so, proto, NULL /* postattach */); 154 } 155 156 netmsg_init(&msg->base, so, &netisr_afree_rport, 0, 157 so->so_proto->pr_usrreqs->pru_attach); 158 msg->nm_proto = proto; 159 msg->nm_ai = NULL; /* postattach */ 160 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 161 162 return 0; 163 } 164 165 /* 166 * NOTE: If the target port changes the bind operation will deal with it. 167 */ 168 int 169 so_pru_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 170 { 171 struct netmsg_pru_bind msg; 172 int error; 173 174 netmsg_init(&msg.base, so, &curthread->td_msgport, 175 0, so->so_proto->pr_usrreqs->pru_bind); 176 msg.nm_nam = nam; 177 msg.nm_td = td; /* used only for prison_ip() */ 178 msg.nm_flags = 0; 179 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 180 return (error); 181 } 182 183 int 184 so_pru_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 185 { 186 struct netmsg_pru_connect msg; 187 int error; 188 189 netmsg_init(&msg.base, so, &curthread->td_msgport, 190 0, so->so_proto->pr_usrreqs->pru_connect); 191 msg.nm_nam = nam; 192 msg.nm_td = td; 193 msg.nm_m = NULL; 194 msg.nm_sndflags = 0; 195 msg.nm_flags = 0; 196 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 197 return (error); 198 } 199 200 int 201 so_pru_connect_async(struct socket *so, struct sockaddr *nam, struct thread *td) 202 { 203 struct netmsg_pru_connect *msg; 204 int error, flags; 205 206 KASSERT(so->so_proto->pr_usrreqs->pru_preconnect != NULL, 207 ("async pru_connect is not supported")); 208 209 /* NOTE: sockaddr immediately follows netmsg */ 210 msg = kmalloc(sizeof(*msg) + nam->sa_len, M_LWKTMSG, 211 M_WAITOK | M_NULLOK); 212 if (msg == NULL) { 213 /* 214 * Fail to allocate message; fallback to 215 * synchronized pru_connect. 216 */ 217 return so_pru_connect(so, nam, td); 218 } 219 220 error = so->so_proto->pr_usrreqs->pru_preconnect(so, nam, td); 221 if (error) { 222 kfree(msg, M_LWKTMSG); 223 return error; 224 } 225 226 flags = PRUC_ASYNC; 227 if (td != NULL && (so->so_proto->pr_flags & PR_ACONN_HOLDTD)) { 228 lwkt_hold(td); 229 flags |= PRUC_HELDTD; 230 } 231 232 netmsg_init(&msg->base, so, &netisr_afree_rport, 0, 233 so->so_proto->pr_usrreqs->pru_connect); 234 msg->nm_nam = (struct sockaddr *)(msg + 1); 235 memcpy(msg->nm_nam, nam, nam->sa_len); 236 msg->nm_td = td; 237 msg->nm_m = NULL; 238 msg->nm_sndflags = 0; 239 msg->nm_flags = flags; 240 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 241 return 0; 242 } 243 244 int 245 so_pru_connect2(struct socket *so1, struct socket *so2) 246 { 247 struct netmsg_pru_connect2 msg; 248 int error; 249 250 netmsg_init(&msg.base, so1, &curthread->td_msgport, 251 0, so1->so_proto->pr_usrreqs->pru_connect2); 252 msg.nm_so1 = so1; 253 msg.nm_so2 = so2; 254 error = lwkt_domsg(so1->so_port, &msg.base.lmsg, 0); 255 return (error); 256 } 257 258 /* 259 * WARNING! Synchronous call from user context. Control function may do 260 * copyin/copyout. 261 */ 262 int 263 so_pru_control_direct(struct socket *so, u_long cmd, caddr_t data, 264 struct ifnet *ifp) 265 { 266 struct netmsg_pru_control msg; 267 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_control; 268 269 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 270 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 271 msg.base.lmsg.ms_flags |= MSGF_SYNC; 272 msg.nm_cmd = cmd; 273 msg.nm_data = data; 274 msg.nm_ifp = ifp; 275 msg.nm_td = curthread; 276 func((netmsg_t)&msg); 277 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 278 return(msg.base.lmsg.ms_error); 279 } 280 281 int 282 so_pru_detach(struct socket *so) 283 { 284 struct netmsg_pru_detach msg; 285 int error; 286 287 netmsg_init(&msg.base, so, &curthread->td_msgport, 288 0, so->so_proto->pr_usrreqs->pru_detach); 289 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 290 return (error); 291 } 292 293 int 294 so_pru_detach_direct(struct socket *so) 295 { 296 struct netmsg_pru_detach msg; 297 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_detach; 298 299 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 300 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 301 msg.base.lmsg.ms_flags |= MSGF_SYNC; 302 func((netmsg_t)&msg); 303 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 304 return(msg.base.lmsg.ms_error); 305 } 306 307 int 308 so_pru_disconnect(struct socket *so) 309 { 310 struct netmsg_pru_disconnect msg; 311 int error; 312 313 netmsg_init(&msg.base, so, &curthread->td_msgport, 314 0, so->so_proto->pr_usrreqs->pru_disconnect); 315 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 316 return (error); 317 } 318 319 void 320 so_pru_disconnect_direct(struct socket *so) 321 { 322 struct netmsg_pru_disconnect msg; 323 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_disconnect; 324 325 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 326 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 327 msg.base.lmsg.ms_flags |= MSGF_SYNC; 328 func((netmsg_t)&msg); 329 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 330 } 331 332 int 333 so_pru_listen(struct socket *so, struct thread *td) 334 { 335 struct netmsg_pru_listen msg; 336 int error; 337 338 netmsg_init(&msg.base, so, &curthread->td_msgport, 339 0, so->so_proto->pr_usrreqs->pru_listen); 340 msg.nm_td = td; /* used only for prison_ip() XXX JH */ 341 msg.nm_flags = 0; 342 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 343 return (error); 344 } 345 346 int 347 so_pru_peeraddr(struct socket *so, struct sockaddr **nam) 348 { 349 struct netmsg_pru_peeraddr msg; 350 int error; 351 352 netmsg_init(&msg.base, so, &curthread->td_msgport, 353 0, so->so_proto->pr_usrreqs->pru_peeraddr); 354 msg.nm_nam = nam; 355 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 356 return (error); 357 } 358 359 int 360 so_pru_rcvd(struct socket *so, int flags) 361 { 362 struct netmsg_pru_rcvd msg; 363 int error; 364 365 netmsg_init(&msg.base, so, &curthread->td_msgport, 366 0, so->so_proto->pr_usrreqs->pru_rcvd); 367 msg.nm_flags = flags; 368 msg.nm_pru_flags = 0; 369 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 370 return (error); 371 } 372 373 void 374 so_pru_rcvd_async(struct socket *so) 375 { 376 lwkt_msg_t lmsg = &so->so_rcvd_msg.base.lmsg; 377 378 KASSERT(so->so_proto->pr_flags & PR_ASYNC_RCVD, 379 ("async pru_rcvd is not supported")); 380 381 /* 382 * WARNING! Spinlock is a bit dodgy, use hacked up sendmsg 383 * to avoid deadlocking. 384 */ 385 spin_lock(&so->so_rcvd_spin); 386 if ((so->so_rcvd_msg.nm_pru_flags & PRUR_DEAD) == 0) { 387 if (lmsg->ms_flags & MSGF_DONE) { 388 lwkt_sendmsg_prepare(so->so_port, lmsg); 389 spin_unlock(&so->so_rcvd_spin); 390 lwkt_sendmsg_start(so->so_port, lmsg); 391 } else { 392 spin_unlock(&so->so_rcvd_spin); 393 } 394 } else { 395 spin_unlock(&so->so_rcvd_spin); 396 } 397 } 398 399 int 400 so_pru_rcvoob(struct socket *so, struct mbuf *m, int flags) 401 { 402 struct netmsg_pru_rcvoob msg; 403 int error; 404 405 netmsg_init(&msg.base, so, &curthread->td_msgport, 406 0, so->so_proto->pr_usrreqs->pru_rcvoob); 407 msg.nm_m = m; 408 msg.nm_flags = flags; 409 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 410 return (error); 411 } 412 413 /* 414 * NOTE: If the target port changes the implied connect will deal with it. 415 */ 416 int 417 so_pru_send(struct socket *so, int flags, struct mbuf *m, 418 struct sockaddr *addr, struct mbuf *control, struct thread *td) 419 { 420 struct netmsg_pru_send msg; 421 int error; 422 423 netmsg_init(&msg.base, so, &curthread->td_msgport, 424 0, so->so_proto->pr_usrreqs->pru_send); 425 msg.nm_flags = flags; 426 msg.nm_m = m; 427 msg.nm_addr = addr; 428 msg.nm_control = control; 429 msg.nm_td = td; 430 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 431 return (error); 432 } 433 434 void 435 so_pru_sync(struct socket *so) 436 { 437 struct netmsg_base msg; 438 439 netmsg_init(&msg, so, &curthread->td_msgport, 0, 440 netmsg_sync_handler); 441 lwkt_domsg(so->so_port, &msg.lmsg, 0); 442 } 443 444 void 445 so_pru_send_async(struct socket *so, int flags, struct mbuf *m, 446 struct sockaddr *addr0, struct mbuf *control, struct thread *td) 447 { 448 struct netmsg_pru_send *msg; 449 struct sockaddr *addr = NULL; 450 451 KASSERT(so->so_proto->pr_flags & PR_ASYNC_SEND, 452 ("async pru_send is not supported")); 453 454 if (addr0 != NULL) { 455 addr = kmalloc(addr0->sa_len, M_SONAME, M_WAITOK | M_NULLOK); 456 if (addr == NULL) { 457 /* 458 * Fail to allocate address; fallback to 459 * synchronized pru_send. 460 */ 461 so_pru_send(so, flags, m, addr0, control, td); 462 return; 463 } 464 memcpy(addr, addr0, addr0->sa_len); 465 flags |= PRUS_FREEADDR; 466 } 467 flags |= PRUS_NOREPLY; 468 469 if (td != NULL && (so->so_proto->pr_flags & PR_ASEND_HOLDTD)) { 470 lwkt_hold(td); 471 flags |= PRUS_HELDTD; 472 } 473 474 msg = &m->m_hdr.mh_sndmsg; 475 netmsg_init(&msg->base, so, &netisr_apanic_rport, 476 0, so->so_proto->pr_usrreqs->pru_send); 477 msg->nm_flags = flags; 478 msg->nm_m = m; 479 msg->nm_addr = addr; 480 msg->nm_control = control; 481 msg->nm_td = td; 482 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 483 } 484 485 int 486 so_pru_sense(struct socket *so, struct stat *sb) 487 { 488 struct netmsg_pru_sense msg; 489 int error; 490 491 netmsg_init(&msg.base, so, &curthread->td_msgport, 492 0, so->so_proto->pr_usrreqs->pru_sense); 493 msg.nm_stat = sb; 494 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 495 return (error); 496 } 497 498 int 499 so_pru_shutdown(struct socket *so) 500 { 501 struct netmsg_pru_shutdown msg; 502 int error; 503 504 netmsg_init(&msg.base, so, &curthread->td_msgport, 505 0, so->so_proto->pr_usrreqs->pru_shutdown); 506 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 507 return (error); 508 } 509 510 int 511 so_pru_sockaddr(struct socket *so, struct sockaddr **nam) 512 { 513 struct netmsg_pru_sockaddr msg; 514 int error; 515 516 netmsg_init(&msg.base, so, &curthread->td_msgport, 517 0, so->so_proto->pr_usrreqs->pru_sockaddr); 518 msg.nm_nam = nam; 519 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 520 return (error); 521 } 522 523 int 524 so_pr_ctloutput(struct socket *so, struct sockopt *sopt) 525 { 526 struct netmsg_pr_ctloutput msg; 527 int error; 528 529 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 530 netmsg_init(&msg.base, so, &curthread->td_msgport, 531 0, so->so_proto->pr_ctloutput); 532 msg.nm_sopt = sopt; 533 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 534 return (error); 535 } 536 537 struct lwkt_port * 538 so_pr_ctlport(struct protosw *pr, int cmd, struct sockaddr *arg, 539 void *extra, int *cpuid) 540 { 541 if (pr->pr_ctlport == NULL) 542 return NULL; 543 KKASSERT(pr->pr_ctlinput != NULL); 544 545 return pr->pr_ctlport(cmd, arg, extra, cpuid); 546 } 547 548 /* 549 * Protocol control input, typically via icmp. 550 * 551 * If the protocol pr_ctlport is not NULL we call it to figure out the 552 * protocol port. If NULL is returned we can just return, otherwise 553 * we issue a netmsg to call pr_ctlinput in the proper thread. 554 * 555 * This must be done synchronously as arg and/or extra may point to 556 * temporary data. 557 */ 558 void 559 so_pr_ctlinput(struct protosw *pr, int cmd, struct sockaddr *arg, void *extra) 560 { 561 struct netmsg_pr_ctlinput msg; 562 lwkt_port_t port; 563 int cpuid; 564 565 port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid); 566 if (port == NULL) 567 return; 568 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 569 0, pr->pr_ctlinput); 570 msg.nm_cmd = cmd; 571 msg.nm_direct = 0; 572 msg.nm_arg = arg; 573 msg.nm_extra = extra; 574 lwkt_domsg(port, &msg.base.lmsg, 0); 575 } 576 577 void 578 so_pr_ctlinput_direct(struct protosw *pr, int cmd, struct sockaddr *arg, 579 void *extra) 580 { 581 struct netmsg_pr_ctlinput msg; 582 netisr_fn_t func; 583 lwkt_port_t port; 584 int cpuid; 585 586 port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid); 587 if (port == NULL) 588 return; 589 if (cpuid != ncpus && cpuid != mycpuid) 590 return; 591 592 func = pr->pr_ctlinput; 593 netmsg_init(&msg.base, NULL, &netisr_adone_rport, 0, func); 594 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 595 msg.base.lmsg.ms_flags |= MSGF_SYNC; 596 msg.nm_cmd = cmd; 597 msg.nm_direct = 1; 598 msg.nm_arg = arg; 599 msg.nm_extra = extra; 600 func((netmsg_t)&msg); 601 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 602 } 603 604 /* 605 * If we convert all the protosw pr_ functions for all the protocols 606 * to take a message directly, this layer can go away. For the moment 607 * our dispatcher ignores the return value, but since we are handling 608 * the replymsg ourselves we return EASYNC by convention. 609 */ 610 611 /* 612 * Handle a predicate event request. This function is only called once 613 * when the predicate message queueing request is received. 614 */ 615 void 616 netmsg_so_notify(netmsg_t msg) 617 { 618 struct socket *so = msg->base.nm_so; 619 struct signalsockbuf *ssb; 620 621 ssb = (msg->notify.nm_etype & NM_REVENT) ? &so->so_rcv : &so->so_snd; 622 623 /* 624 * Reply immediately if the event has occured, otherwise queue the 625 * request. 626 * 627 * NOTE: Socket can change if this is an accept predicate so cache 628 * the token. 629 */ 630 lwkt_getpooltoken(so); 631 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT); 632 if (msg->notify.nm_predicate(&msg->notify)) { 633 if (TAILQ_EMPTY(&ssb->ssb_mlist)) 634 atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT); 635 lwkt_relpooltoken(so); 636 lwkt_replymsg(&msg->base.lmsg, 637 msg->base.lmsg.ms_error); 638 } else { 639 TAILQ_INSERT_TAIL(&ssb->ssb_mlist, &msg->notify, nm_list); 640 /* 641 * NOTE: 642 * If predict ever blocks, 'tok' will be released, so 643 * SSB_MEVENT set beforehand could have been cleared 644 * when we reach here. In case that happens, we set 645 * SSB_MEVENT again, after the notify has been queued. 646 */ 647 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT); 648 lwkt_relpooltoken(so); 649 } 650 } 651 652 /* 653 * Called by doio when trying to abort a netmsg_so_notify message. 654 * Unlike the other functions this one is dispatched directly by 655 * the LWKT subsystem, so it takes a lwkt_msg_t as an argument. 656 * 657 * The original message, lmsg, is under the control of the caller and 658 * will not be destroyed until we return so we can safely reference it 659 * in our synchronous abort request. 660 * 661 * This part of the abort request occurs on the originating cpu which 662 * means we may race the message flags and the original message may 663 * not even have been processed by the target cpu yet. 664 */ 665 void 666 netmsg_so_notify_doabort(lwkt_msg_t lmsg) 667 { 668 struct netmsg_so_notify_abort msg; 669 670 if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 671 const struct netmsg_base *nmsg = 672 (const struct netmsg_base *)lmsg; 673 674 netmsg_init(&msg.base, nmsg->nm_so, &curthread->td_msgport, 675 0, netmsg_so_notify_abort); 676 msg.nm_notifymsg = (void *)lmsg; 677 lwkt_domsg(lmsg->ms_target_port, &msg.base.lmsg, 0); 678 } 679 } 680 681 /* 682 * Predicate requests can be aborted. This function is only called once 683 * and will interlock against processing/reply races (since such races 684 * occur on the same thread that controls the port where the abort is 685 * requeued). 686 * 687 * This part of the abort request occurs on the target cpu. The message 688 * flags must be tested again in case the test that we did on the 689 * originating cpu raced. Since messages are handled in sequence, the 690 * original message will have already been handled by the loop and either 691 * replied to or queued. 692 * 693 * We really only need to interlock with MSGF_REPLY (a bit that is set on 694 * our cpu when we reply). Note that MSGF_DONE is not set until the 695 * reply reaches the originating cpu. Test both bits anyway. 696 */ 697 void 698 netmsg_so_notify_abort(netmsg_t msg) 699 { 700 struct netmsg_so_notify_abort *abrtmsg = &msg->notify_abort; 701 struct netmsg_so_notify *nmsg = abrtmsg->nm_notifymsg; 702 struct signalsockbuf *ssb; 703 704 /* 705 * The original notify message is not destroyed until after the 706 * abort request is returned, so we can check its state. 707 */ 708 lwkt_getpooltoken(nmsg->base.nm_so); 709 if ((nmsg->base.lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 710 ssb = (nmsg->nm_etype & NM_REVENT) ? 711 &nmsg->base.nm_so->so_rcv : 712 &nmsg->base.nm_so->so_snd; 713 TAILQ_REMOVE(&ssb->ssb_mlist, nmsg, nm_list); 714 lwkt_relpooltoken(nmsg->base.nm_so); 715 lwkt_replymsg(&nmsg->base.lmsg, EINTR); 716 } else { 717 lwkt_relpooltoken(nmsg->base.nm_so); 718 } 719 720 /* 721 * Reply to the abort message 722 */ 723 lwkt_replymsg(&abrtmsg->base.lmsg, 0); 724 } 725 726 void 727 so_async_rcvd_reply(struct socket *so) 728 { 729 /* 730 * Spinlock safe, reply runs to degenerate lwkt_null_replyport() 731 */ 732 spin_lock(&so->so_rcvd_spin); 733 lwkt_replymsg(&so->so_rcvd_msg.base.lmsg, 0); 734 spin_unlock(&so->so_rcvd_spin); 735 } 736 737 void 738 so_async_rcvd_drop(struct socket *so) 739 { 740 lwkt_msg_t lmsg = &so->so_rcvd_msg.base.lmsg; 741 742 /* 743 * Spinlock safe, drop runs to degenerate lwkt_spin_dropmsg() 744 */ 745 spin_lock(&so->so_rcvd_spin); 746 so->so_rcvd_msg.nm_pru_flags |= PRUR_DEAD; 747 again: 748 lwkt_dropmsg(lmsg); 749 if ((lmsg->ms_flags & MSGF_DONE) == 0) { 750 ++async_rcvd_drop_race; 751 ssleep(so, &so->so_rcvd_spin, 0, "soadrop", 1); 752 goto again; 753 } 754 spin_unlock(&so->so_rcvd_spin); 755 } 756