sys/kern/uipc_msg.c

   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
 531         if (sopt->sopt_dir == SOPT_SET && so->so_proto->pr_ctloutmsg != NULL) {
 532                 struct netmsg_pr_ctloutput *amsg;
 533
 534                 /* Fast path: asynchronous pr_ctloutput */
 535                 amsg = so->so_proto->pr_ctloutmsg(sopt);
 536                 if (amsg != NULL) {
 537                         netmsg_init(&amsg->base, so, &netisr_afree_rport, 0,
 538                             so->so_proto->pr_ctloutput);
 539                         /* nm_flags and nm_sopt are setup by pr_ctloutmsg */
 540                         lwkt_sendmsg(so->so_port, &amsg->base.lmsg);
 541                         return 0;
 542                 }
 543                 /* FALLTHROUGH */
 544         }
 545
 546         netmsg_init(&msg.base, so, &curthread->td_msgport,
 547                     0, so->so_proto->pr_ctloutput);
 548         msg.nm_flags = 0;
 549         msg.nm_sopt = sopt;
 550         error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0);
 551         return (error);
 552 }
 553
 554 struct lwkt_port *
 555 so_pr_ctlport(struct protosw *pr, int cmd, struct sockaddr *arg,
 556     void *extra, int *cpuid)
 557 {
 558         if (pr->pr_ctlport == NULL)
 559                 return NULL;
 560         KKASSERT(pr->pr_ctlinput != NULL);
 561
 562         return pr->pr_ctlport(cmd, arg, extra, cpuid);
 563 }
 564
 565 /*
 566  * Protocol control input, typically via icmp.
 567  *
 568  * If the protocol pr_ctlport is not NULL we call it to figure out the
 569  * protocol port.  If NULL is returned we can just return, otherwise
 570  * we issue a netmsg to call pr_ctlinput in the proper thread.
 571  *
 572  * This must be done synchronously as arg and/or extra may point to
 573  * temporary data.
 574  */
 575 void
 576 so_pr_ctlinput(struct protosw *pr, int cmd, struct sockaddr *arg, void *extra)
 577 {
 578         struct netmsg_pr_ctlinput msg;
 579         lwkt_port_t port;
 580         int cpuid;
 581
 582         port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid);
 583         if (port == NULL)
 584                 return;
 585         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
 586                     0, pr->pr_ctlinput);
 587         msg.nm_cmd = cmd;
 588         msg.nm_direct = 0;
 589         msg.nm_arg = arg;
 590         msg.nm_extra = extra;
 591         lwkt_domsg(port, &msg.base.lmsg, 0);
 592 }
 593
 594 void
 595 so_pr_ctlinput_direct(struct protosw *pr, int cmd, struct sockaddr *arg,
 596     void *extra)
 597 {
 598         struct netmsg_pr_ctlinput msg;
 599         netisr_fn_t func;
 600         lwkt_port_t port;
 601         int cpuid;
 602
 603         port = so_pr_ctlport(pr, cmd, arg, extra, &cpuid);
 604         if (port == NULL)
 605                 return;
 606         if (cpuid != ncpus && cpuid != mycpuid)
 607                 return;
 608
 609         func = pr->pr_ctlinput;
 610         netmsg_init(&msg.base, NULL, &netisr_adone_rport, 0, func);
 611         msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE);
 612         msg.base.lmsg.ms_flags |= MSGF_SYNC;
 613         msg.nm_cmd = cmd;
 614         msg.nm_direct = 1;
 615         msg.nm_arg = arg;
 616         msg.nm_extra = extra;
 617         func((netmsg_t)&msg);
 618         KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE);
 619 }
 620
 621 /*
 622  * If we convert all the protosw pr_ functions for all the protocols
 623  * to take a message directly, this layer can go away.  For the moment
 624  * our dispatcher ignores the return value, but since we are handling
 625  * the replymsg ourselves we return EASYNC by convention.
 626  */
 627
 628 /*
 629  * Handle a predicate event request.  This function is only called once
 630  * when the predicate message queueing request is received.
 631  */
 632 void
 633 netmsg_so_notify(netmsg_t msg)
 634 {
 635         struct socket *so = msg->base.nm_so;
 636         struct signalsockbuf *ssb;
 637
 638         ssb = (msg->notify.nm_etype & NM_REVENT) ? &so->so_rcv : &so->so_snd;
 639
 640         /*
 641          * Reply immediately if the event has occured, otherwise queue the
 642          * request.
 643          *
 644          * NOTE: Socket can change if this is an accept predicate so cache
 645          *       the token.
 646          */
 647         lwkt_getpooltoken(so);
 648         atomic_set_int(&ssb->ssb_flags, SSB_MEVENT);
 649         if (msg->notify.nm_predicate(&msg->notify)) {
 650                 if (TAILQ_EMPTY(&ssb->ssb_mlist))
 651                         atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
 652                 lwkt_relpooltoken(so);
 653                 lwkt_replymsg(&msg->base.lmsg,
 654                               msg->base.lmsg.ms_error);
 655         } else {
 656                 TAILQ_INSERT_TAIL(&ssb->ssb_mlist, &msg->notify, nm_list);
 657                 /*
 658                  * NOTE:
 659                  * If predict ever blocks, 'tok' will be released, so
 660                  * SSB_MEVENT set beforehand could have been cleared
 661                  * when we reach here.  In case that happens, we set
 662                  * SSB_MEVENT again, after the notify has been queued.
 663                  */
 664                 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT);
 665                 lwkt_relpooltoken(so);
 666         }
 667 }
 668
 669 /*
 670  * Called by doio when trying to abort a netmsg_so_notify message.
 671  * Unlike the other functions this one is dispatched directly by
 672  * the LWKT subsystem, so it takes a lwkt_msg_t as an argument.
 673  *
 674  * The original message, lmsg, is under the control of the caller and
 675  * will not be destroyed until we return so we can safely reference it
 676  * in our synchronous abort request.
 677  *
 678  * This part of the abort request occurs on the originating cpu which
 679  * means we may race the message flags and the original message may
 680  * not even have been processed by the target cpu yet.
 681  */
 682 void
 683 netmsg_so_notify_doabort(lwkt_msg_t lmsg)
 684 {
 685         struct netmsg_so_notify_abort msg;
 686
 687         if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
 688                 const struct netmsg_base *nmsg =
 689                     (const struct netmsg_base *)lmsg;
 690
 691                 netmsg_init(&msg.base, nmsg->nm_so, &curthread->td_msgport,
 692                             0, netmsg_so_notify_abort);
 693                 msg.nm_notifymsg = (void *)lmsg;
 694                 lwkt_domsg(lmsg->ms_target_port, &msg.base.lmsg, 0);
 695         }
 696 }
 697
 698 /*
 699  * Predicate requests can be aborted.  This function is only called once
 700  * and will interlock against processing/reply races (since such races
 701  * occur on the same thread that controls the port where the abort is
 702  * requeued).
 703  *
 704  * This part of the abort request occurs on the target cpu.  The message
 705  * flags must be tested again in case the test that we did on the
 706  * originating cpu raced.  Since messages are handled in sequence, the
 707  * original message will have already been handled by the loop and either
 708  * replied to or queued.
 709  *
 710  * We really only need to interlock with MSGF_REPLY (a bit that is set on
 711  * our cpu when we reply).  Note that MSGF_DONE is not set until the
 712  * reply reaches the originating cpu.  Test both bits anyway.
 713  */
 714 void
 715 netmsg_so_notify_abort(netmsg_t msg)
 716 {
 717         struct netmsg_so_notify_abort *abrtmsg = &msg->notify_abort;
 718         struct netmsg_so_notify *nmsg = abrtmsg->nm_notifymsg;
 719         struct signalsockbuf *ssb;
 720
 721         /*
 722          * The original notify message is not destroyed until after the
 723          * abort request is returned, so we can check its state.
 724          */
 725         lwkt_getpooltoken(nmsg->base.nm_so);
 726         if ((nmsg->base.lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
 727                 ssb = (nmsg->nm_etype & NM_REVENT) ?
 728                                 &nmsg->base.nm_so->so_rcv :
 729                                 &nmsg->base.nm_so->so_snd;
 730                 TAILQ_REMOVE(&ssb->ssb_mlist, nmsg, nm_list);
 731                 lwkt_relpooltoken(nmsg->base.nm_so);
 732                 lwkt_replymsg(&nmsg->base.lmsg, EINTR);
 733         } else {
 734                 lwkt_relpooltoken(nmsg->base.nm_so);
 735         }
 736
 737         /*
 738          * Reply to the abort message
 739          */
 740         lwkt_replymsg(&abrtmsg->base.lmsg, 0);
 741 }
 742
 743 void
 744 so_async_rcvd_reply(struct socket *so)
 745 {
 746         /*
 747          * Spinlock safe, reply runs to degenerate lwkt_null_replyport()
 748          */
 749         spin_lock(&so->so_rcvd_spin);
 750         lwkt_replymsg(&so->so_rcvd_msg.base.lmsg, 0);
 751         spin_unlock(&so->so_rcvd_spin);
 752 }
 753
 754 void
 755 so_async_rcvd_drop(struct socket *so)
 756 {
 757         lwkt_msg_t lmsg = &so->so_rcvd_msg.base.lmsg;
 758
 759         /*
 760          * Spinlock safe, drop runs to degenerate lwkt_spin_dropmsg()
 761          */
 762         spin_lock(&so->so_rcvd_spin);
 763         so->so_rcvd_msg.nm_pru_flags |= PRUR_DEAD;
 764 again:
 765         lwkt_dropmsg(lmsg);
 766         if ((lmsg->ms_flags & MSGF_DONE) == 0) {
 767                 ++async_rcvd_drop_race;
 768                 ssleep(so, &so->so_rcvd_spin, 0, "soadrop", 1);
 769                 goto again;
 770         }
 771         spin_unlock(&so->so_rcvd_spin);
 772 }