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 * $DragonFly: src/sys/kern/uipc_msg.c,v 1.26 2008/10/27 02:56:30 sephe Exp $ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/msgport.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/socketops.h> 44 #include <sys/thread.h> 45 #include <sys/thread2.h> 46 #include <sys/msgport2.h> 47 #include <vm/pmap.h> 48 #include <net/netmsg2.h> 49 50 #include <net/netisr.h> 51 #include <net/netmsg.h> 52 53 /* 54 * Abort a socket and free it. Called from soabort() only. soabort() 55 * got a ref on the socket which we must free on reply. 56 */ 57 void 58 so_pru_abort(struct socket *so) 59 { 60 struct netmsg_pru_abort msg; 61 62 netmsg_init(&msg.base, so, &curthread->td_msgport, 63 0, so->so_proto->pr_usrreqs->pru_abort); 64 (void)lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 65 sofree(msg.base.nm_so); 66 } 67 68 /* 69 * Abort a socket and free it, asynchronously. Called from 70 * soaborta() only. soaborta() got a ref on the socket which we must 71 * free on reply. 72 */ 73 void 74 so_pru_aborta(struct socket *so) 75 { 76 struct netmsg_pru_abort *msg; 77 78 msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_ZERO); 79 netmsg_init(&msg->base, so, &netisr_afree_free_so_rport, 80 0, so->so_proto->pr_usrreqs->pru_abort); 81 lwkt_sendmsg(so->so_port, &msg->base.lmsg); 82 } 83 84 /* 85 * Abort a socket and free it. Called from soabort_oncpu() only. 86 * Caller must make sure that the current CPU is inpcb's owner CPU. 87 */ 88 void 89 so_pru_abort_oncpu(struct socket *so) 90 { 91 struct netmsg_pru_abort msg; 92 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_abort; 93 94 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 95 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 96 msg.base.lmsg.ms_flags |= MSGF_SYNC; 97 func((netmsg_t)&msg); 98 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 99 sofree(msg.base.nm_so); 100 } 101 102 /* 103 * WARNING! Synchronous call from user context 104 */ 105 int 106 so_pru_accept_direct(struct socket *so, struct sockaddr **nam) 107 { 108 struct netmsg_pru_accept msg; 109 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_accept; 110 111 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 112 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 113 msg.base.lmsg.ms_flags |= MSGF_SYNC; 114 msg.nm_nam = nam; 115 func((netmsg_t)&msg); 116 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 117 return(msg.base.lmsg.ms_error); 118 } 119 120 int 121 so_pru_attach(struct socket *so, int proto, struct pru_attach_info *ai) 122 { 123 struct netmsg_pru_attach msg; 124 int error; 125 126 netmsg_init(&msg.base, so, &curthread->td_msgport, 127 0, so->so_proto->pr_usrreqs->pru_attach); 128 msg.nm_proto = proto; 129 msg.nm_ai = ai; 130 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 131 return (error); 132 } 133 134 int 135 so_pru_attach_direct(struct socket *so, int proto, struct pru_attach_info *ai) 136 { 137 struct netmsg_pru_attach msg; 138 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_attach; 139 140 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 141 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 142 msg.base.lmsg.ms_flags |= MSGF_SYNC; 143 msg.nm_proto = proto; 144 msg.nm_ai = ai; 145 func((netmsg_t)&msg); 146 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 147 return(msg.base.lmsg.ms_error); 148 } 149 150 /* 151 * NOTE: If the target port changes the bind operation will deal with it. 152 */ 153 int 154 so_pru_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 155 { 156 struct netmsg_pru_bind msg; 157 int error; 158 159 netmsg_init(&msg.base, so, &curthread->td_msgport, 160 0, so->so_proto->pr_usrreqs->pru_bind); 161 msg.nm_nam = nam; 162 msg.nm_td = td; /* used only for prison_ip() */ 163 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 164 return (error); 165 } 166 167 int 168 so_pru_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 169 { 170 struct netmsg_pru_connect msg; 171 int error; 172 173 netmsg_init(&msg.base, so, &curthread->td_msgport, 174 0, so->so_proto->pr_usrreqs->pru_connect); 175 msg.nm_nam = nam; 176 msg.nm_td = td; 177 msg.nm_m = NULL; 178 msg.nm_flags = 0; 179 msg.nm_reconnect = 0; 180 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 181 return (error); 182 } 183 184 int 185 so_pru_connect2(struct socket *so1, struct socket *so2) 186 { 187 struct netmsg_pru_connect2 msg; 188 int error; 189 190 netmsg_init(&msg.base, so1, &curthread->td_msgport, 191 0, so1->so_proto->pr_usrreqs->pru_connect2); 192 msg.nm_so1 = so1; 193 msg.nm_so2 = so2; 194 error = lwkt_domsg(so1->so_port, &msg.base.lmsg, 0); 195 return (error); 196 } 197 198 /* 199 * WARNING! Synchronous call from user context. Control function may do 200 * copyin/copyout. 201 */ 202 int 203 so_pru_control_direct(struct socket *so, u_long cmd, caddr_t data, 204 struct ifnet *ifp) 205 { 206 struct netmsg_pru_control msg; 207 netisr_fn_t func = so->so_proto->pr_usrreqs->pru_control; 208 209 netmsg_init(&msg.base, so, &netisr_adone_rport, 0, func); 210 msg.base.lmsg.ms_flags &= ~(MSGF_REPLY | MSGF_DONE); 211 msg.base.lmsg.ms_flags |= MSGF_SYNC; 212 msg.nm_cmd = cmd; 213 msg.nm_data = data; 214 msg.nm_ifp = ifp; 215 msg.nm_td = curthread; 216 func((netmsg_t)&msg); 217 KKASSERT(msg.base.lmsg.ms_flags & MSGF_DONE); 218 return(msg.base.lmsg.ms_error); 219 } 220 221 int 222 so_pru_detach(struct socket *so) 223 { 224 struct netmsg_pru_detach msg; 225 int error; 226 227 netmsg_init(&msg.base, so, &curthread->td_msgport, 228 0, so->so_proto->pr_usrreqs->pru_detach); 229 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 230 return (error); 231 } 232 233 int 234 so_pru_disconnect(struct socket *so) 235 { 236 struct netmsg_pru_disconnect msg; 237 int error; 238 239 netmsg_init(&msg.base, so, &curthread->td_msgport, 240 0, so->so_proto->pr_usrreqs->pru_disconnect); 241 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 242 return (error); 243 } 244 245 int 246 so_pru_listen(struct socket *so, struct thread *td) 247 { 248 struct netmsg_pru_listen msg; 249 int error; 250 251 netmsg_init(&msg.base, so, &curthread->td_msgport, 252 0, so->so_proto->pr_usrreqs->pru_listen); 253 msg.nm_td = td; /* used only for prison_ip() XXX JH */ 254 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 255 return (error); 256 } 257 258 int 259 so_pru_peeraddr(struct socket *so, struct sockaddr **nam) 260 { 261 struct netmsg_pru_peeraddr msg; 262 int error; 263 264 netmsg_init(&msg.base, so, &curthread->td_msgport, 265 0, so->so_proto->pr_usrreqs->pru_peeraddr); 266 msg.nm_nam = nam; 267 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 268 return (error); 269 } 270 271 int 272 so_pru_rcvd(struct socket *so, int flags) 273 { 274 struct netmsg_pru_rcvd msg; 275 int error; 276 277 netmsg_init(&msg.base, so, &curthread->td_msgport, 278 0, so->so_proto->pr_usrreqs->pru_rcvd); 279 msg.nm_flags = flags; 280 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 281 return (error); 282 } 283 284 int 285 so_pru_rcvoob(struct socket *so, struct mbuf *m, int flags) 286 { 287 struct netmsg_pru_rcvoob msg; 288 int error; 289 290 netmsg_init(&msg.base, so, &curthread->td_msgport, 291 0, so->so_proto->pr_usrreqs->pru_rcvoob); 292 msg.nm_m = m; 293 msg.nm_flags = flags; 294 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 295 return (error); 296 } 297 298 /* 299 * NOTE: If the target port changes the implied connect will deal with it. 300 */ 301 int 302 so_pru_send(struct socket *so, int flags, struct mbuf *m, 303 struct sockaddr *addr, struct mbuf *control, struct thread *td) 304 { 305 struct netmsg_pru_send msg; 306 int error; 307 308 netmsg_init(&msg.base, so, &curthread->td_msgport, 309 0, so->so_proto->pr_usrreqs->pru_send); 310 msg.nm_flags = flags; 311 msg.nm_m = m; 312 msg.nm_addr = addr; 313 msg.nm_control = control; 314 msg.nm_td = td; 315 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 316 return (error); 317 } 318 319 int 320 so_pru_sense(struct socket *so, struct stat *sb) 321 { 322 struct netmsg_pru_sense msg; 323 int error; 324 325 netmsg_init(&msg.base, so, &curthread->td_msgport, 326 0, so->so_proto->pr_usrreqs->pru_sense); 327 msg.nm_stat = sb; 328 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 329 return (error); 330 } 331 332 int 333 so_pru_shutdown(struct socket *so) 334 { 335 struct netmsg_pru_shutdown msg; 336 int error; 337 338 netmsg_init(&msg.base, so, &curthread->td_msgport, 339 0, so->so_proto->pr_usrreqs->pru_shutdown); 340 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 341 return (error); 342 } 343 344 int 345 so_pru_sockaddr(struct socket *so, struct sockaddr **nam) 346 { 347 struct netmsg_pru_sockaddr msg; 348 int error; 349 350 netmsg_init(&msg.base, so, &curthread->td_msgport, 351 0, so->so_proto->pr_usrreqs->pru_sockaddr); 352 msg.nm_nam = nam; 353 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 354 return (error); 355 } 356 357 int 358 so_pr_ctloutput(struct socket *so, struct sockopt *sopt) 359 { 360 struct netmsg_pr_ctloutput msg; 361 int error; 362 363 KKASSERT(!sopt->sopt_val || kva_p(sopt->sopt_val)); 364 netmsg_init(&msg.base, so, &curthread->td_msgport, 365 0, so->so_proto->pr_ctloutput); 366 msg.nm_sopt = sopt; 367 error = lwkt_domsg(so->so_port, &msg.base.lmsg, 0); 368 return (error); 369 } 370 371 /* 372 * Protocol control input, typically via icmp. 373 * 374 * If the protocol pr_ctlport is not NULL we call it to figure out the 375 * protocol port. If NULL is returned we can just return, otherwise 376 * we issue a netmsg to call pr_ctlinput in the proper thread. 377 * 378 * This must be done synchronously as arg and/or extra may point to 379 * temporary data. 380 */ 381 void 382 so_pru_ctlinput(struct protosw *pr, int cmd, struct sockaddr *arg, void *extra) 383 { 384 struct netmsg_pru_ctlinput msg; 385 lwkt_port_t port; 386 387 if (pr->pr_ctlport == NULL) 388 return; 389 KKASSERT(pr->pr_ctlinput != NULL); 390 port = pr->pr_ctlport(cmd, arg, extra); 391 if (port == NULL) 392 return; 393 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 394 0, pr->pr_ctlinput); 395 msg.nm_cmd = cmd; 396 msg.nm_arg = arg; 397 msg.nm_extra = extra; 398 lwkt_domsg(port, &msg.base.lmsg, 0); 399 } 400 401 /* 402 * If we convert all the protosw pr_ functions for all the protocols 403 * to take a message directly, this layer can go away. For the moment 404 * our dispatcher ignores the return value, but since we are handling 405 * the replymsg ourselves we return EASYNC by convention. 406 */ 407 408 /* 409 * Handle a predicate event request. This function is only called once 410 * when the predicate message queueing request is received. 411 */ 412 void 413 netmsg_so_notify(netmsg_t msg) 414 { 415 struct signalsockbuf *ssb; 416 417 ssb = (msg->notify.nm_etype & NM_REVENT) ? 418 &msg->base.nm_so->so_rcv : 419 &msg->base.nm_so->so_snd; 420 421 /* 422 * Reply immediately if the event has occured, otherwise queue the 423 * request. 424 */ 425 if (msg->notify.nm_predicate(&msg->notify)) { 426 lwkt_replymsg(&msg->base.lmsg, 427 msg->base.lmsg.ms_error); 428 } else { 429 lwkt_gettoken(&kq_token); 430 TAILQ_INSERT_TAIL(&ssb->ssb_kq.ki_mlist, &msg->notify, nm_list); 431 atomic_set_int(&ssb->ssb_flags, SSB_MEVENT); 432 lwkt_reltoken(&kq_token); 433 } 434 } 435 436 /* 437 * Called by doio when trying to abort a netmsg_so_notify message. 438 * Unlike the other functions this one is dispatched directly by 439 * the LWKT subsystem, so it takes a lwkt_msg_t as an argument. 440 * 441 * The original message, lmsg, is under the control of the caller and 442 * will not be destroyed until we return so we can safely reference it 443 * in our synchronous abort request. 444 * 445 * This part of the abort request occurs on the originating cpu which 446 * means we may race the message flags and the original message may 447 * not even have been processed by the target cpu yet. 448 */ 449 void 450 netmsg_so_notify_doabort(lwkt_msg_t lmsg) 451 { 452 struct netmsg_so_notify_abort msg; 453 454 if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 455 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 456 0, netmsg_so_notify_abort); 457 msg.nm_notifymsg = (void *)lmsg; 458 lwkt_domsg(lmsg->ms_target_port, &msg.base.lmsg, 0); 459 } 460 } 461 462 /* 463 * Predicate requests can be aborted. This function is only called once 464 * and will interlock against processing/reply races (since such races 465 * occur on the same thread that controls the port where the abort is 466 * requeued). 467 * 468 * This part of the abort request occurs on the target cpu. The message 469 * flags must be tested again in case the test that we did on the 470 * originating cpu raced. Since messages are handled in sequence, the 471 * original message will have already been handled by the loop and either 472 * replied to or queued. 473 * 474 * We really only need to interlock with MSGF_REPLY (a bit that is set on 475 * our cpu when we reply). Note that MSGF_DONE is not set until the 476 * reply reaches the originating cpu. Test both bits anyway. 477 */ 478 void 479 netmsg_so_notify_abort(netmsg_t msg) 480 { 481 struct netmsg_so_notify_abort *abrtmsg = &msg->notify_abort; 482 struct netmsg_so_notify *nmsg = abrtmsg->nm_notifymsg; 483 struct signalsockbuf *ssb; 484 485 /* 486 * The original notify message is not destroyed until after the 487 * abort request is returned, so we can check its state. 488 */ 489 if ((nmsg->base.lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) { 490 ssb = (nmsg->nm_etype & NM_REVENT) ? 491 &nmsg->base.nm_so->so_rcv : 492 &nmsg->base.nm_so->so_snd; 493 lwkt_gettoken(&kq_token); 494 TAILQ_REMOVE(&ssb->ssb_kq.ki_mlist, nmsg, nm_list); 495 lwkt_reltoken(&kq_token); 496 lwkt_replymsg(&nmsg->base.lmsg, EINTR); 497 } 498 499 /* 500 * Reply to the abort message 501 */ 502 lwkt_replymsg(&abrtmsg->base.lmsg, 0); 503 } 504