1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 Ng Peng Nam Sean 5 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * This file contains socket and protocol bindings for netlink. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/lock.h> 37 #include <sys/rmlock.h> 38 #include <sys/domain.h> 39 #include <sys/mbuf.h> 40 #include <sys/protosw.h> 41 #include <sys/proc.h> 42 #include <sys/ck.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/sysent.h> 46 #include <sys/syslog.h> 47 #include <sys/priv.h> /* priv_check */ 48 49 #include <netlink/netlink.h> 50 #include <netlink/netlink_ctl.h> 51 #include <netlink/netlink_var.h> 52 53 #define DEBUG_MOD_NAME nl_domain 54 #define DEBUG_MAX_LEVEL LOG_DEBUG3 55 #include <netlink/netlink_debug.h> 56 _DECLARE_DEBUG(LOG_DEBUG); 57 58 59 #define NLCTL_TRACKER struct rm_priotracker nl_tracker 60 #define NLCTL_RLOCK(_ctl) rm_rlock(&((_ctl)->ctl_lock), &nl_tracker) 61 #define NLCTL_RUNLOCK(_ctl) rm_runlock(&((_ctl)->ctl_lock), &nl_tracker) 62 63 #define NLCTL_WLOCK(_ctl) rm_wlock(&((_ctl)->ctl_lock)) 64 #define NLCTL_WUNLOCK(_ctl) rm_wunlock(&((_ctl)->ctl_lock)) 65 66 static u_long nl_sendspace = NLSNDQ; 67 SYSCTL_ULONG(_net_netlink, OID_AUTO, sendspace, CTLFLAG_RW, &nl_sendspace, 0, 68 "Default netlink socket send space"); 69 70 static u_long nl_recvspace = NLSNDQ; 71 SYSCTL_ULONG(_net_netlink, OID_AUTO, recvspace, CTLFLAG_RW, &nl_recvspace, 0, 72 "Default netlink socket receive space"); 73 74 extern u_long sb_max_adj; 75 static u_long nl_maxsockbuf = 512 * 1024 * 1024; /* 512M, XXX: init based on physmem */ 76 77 uint32_t 78 nlp_get_pid(const struct nlpcb *nlp) 79 { 80 return (nlp->nl_process_id); 81 } 82 83 /* 84 * Looks up a nlpcb struct based on the @portid. Need to claim nlsock_mtx. 85 * Returns nlpcb pointer if present else NULL 86 */ 87 static struct nlpcb * 88 nl_port_lookup(uint32_t port_id) 89 { 90 struct nlpcb *nlp; 91 92 CK_LIST_FOREACH(nlp, &V_nl_ctl->ctl_port_head, nl_port_next) { 93 if (nlp->nl_port == port_id) 94 return (nlp); 95 } 96 return (NULL); 97 } 98 99 static void 100 nl_update_groups_locked(struct nlpcb *nlp, uint64_t nl_groups) 101 { 102 /* Update group mask */ 103 NL_LOG(LOG_DEBUG2, "socket %p, groups 0x%X -> 0x%X", 104 nlp->nl_socket, (uint32_t)nlp->nl_groups, (uint32_t)nl_groups); 105 nlp->nl_groups = nl_groups; 106 } 107 108 /* 109 * Broadcasts message @m to the protocol @proto group specified by @group_id 110 */ 111 void 112 nl_send_group(struct mbuf *m, int num_messages, int proto, int group_id) 113 { 114 struct nlpcb *nlp_last = NULL; 115 struct nlpcb *nlp; 116 NLCTL_TRACKER; 117 118 IF_DEBUG_LEVEL(LOG_DEBUG2) { 119 struct nlmsghdr *hdr = mtod(m, struct nlmsghdr *); 120 NL_LOG(LOG_DEBUG2, "MCAST mbuf len %u msg type %d len %u to group %d/%d", 121 m->m_len, hdr->nlmsg_type, hdr->nlmsg_len, proto, group_id); 122 } 123 124 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 125 if (__predict_false(ctl == NULL)) { 126 /* 127 * Can be the case when notification is sent within VNET 128 * which doesn't have any netlink sockets. 129 */ 130 m_freem(m); 131 return; 132 } 133 134 NLCTL_RLOCK(ctl); 135 136 int io_flags = NL_IOF_UNTRANSLATED; 137 uint64_t groups_mask = 1 << ((uint64_t)group_id - 1); 138 139 CK_LIST_FOREACH(nlp, &ctl->ctl_pcb_head, nl_next) { 140 if (nlp->nl_groups & groups_mask && nlp->nl_proto == proto) { 141 if (nlp_last != NULL) { 142 struct mbuf *m_copy; 143 m_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); 144 if (m_copy != NULL) 145 nl_send_one(m_copy, nlp_last, num_messages, io_flags); 146 else { 147 NLP_LOCK(nlp_last); 148 if (nlp_last->nl_socket != NULL) 149 sorwakeup(nlp_last->nl_socket); 150 NLP_UNLOCK(nlp_last); 151 } 152 } 153 nlp_last = nlp; 154 } 155 } 156 if (nlp_last != NULL) 157 nl_send_one(m, nlp_last, num_messages, io_flags); 158 else 159 m_freem(m); 160 161 NLCTL_RUNLOCK(ctl); 162 } 163 164 bool 165 nl_has_listeners(int netlink_family, uint32_t groups_mask) 166 { 167 return (V_nl_ctl != NULL); 168 } 169 170 bool 171 nlp_has_priv(struct nlpcb *nlp, int priv) 172 { 173 return (priv_check_cred(nlp->nl_cred, priv) == 0); 174 } 175 176 static uint32_t 177 nl_find_port() { 178 /* 179 * app can open multiple netlink sockets. 180 * Start with current pid, if already taken, 181 * try random numbers in 65k..256k+65k space, 182 * avoiding clash with pids. 183 */ 184 if (nl_port_lookup(curproc->p_pid) == NULL) 185 return (curproc->p_pid); 186 for (int i = 0; i < 16; i++) { 187 uint32_t nl_port = (arc4random() % 65536) + 65536 * 4; 188 if (nl_port_lookup(nl_port) == 0) 189 return (nl_port); 190 NL_LOG(LOG_DEBUG3, "tried %u\n", nl_port); 191 } 192 return (curproc->p_pid); 193 } 194 195 static int 196 nl_bind_locked(struct nlpcb *nlp, struct sockaddr_nl *snl) 197 { 198 if (nlp->nl_bound) { 199 if (nlp->nl_port != snl->nl_pid) { 200 NL_LOG(LOG_DEBUG, 201 "bind() failed: program pid %d " 202 "is different from provided pid %d", 203 nlp->nl_port, snl->nl_pid); 204 return (EINVAL); // XXX: better error 205 } 206 } else { 207 if (snl->nl_pid == 0) 208 snl->nl_pid = nl_find_port(); 209 if (nl_port_lookup(snl->nl_pid) != NULL) 210 return (EADDRINUSE); 211 nlp->nl_port = snl->nl_pid; 212 nlp->nl_bound = true; 213 CK_LIST_INSERT_HEAD(&V_nl_ctl->ctl_port_head, nlp, nl_port_next); 214 } 215 nl_update_groups_locked(nlp, snl->nl_groups); 216 217 return (0); 218 } 219 220 static int 221 nl_pru_attach(struct socket *so, int proto, struct thread *td) 222 { 223 struct nlpcb *nlp; 224 int error; 225 226 if (__predict_false(netlink_unloading != 0)) 227 return (EAFNOSUPPORT); 228 229 error = nl_verify_proto(proto); 230 if (error != 0) 231 return (error); 232 233 bool is_linux = SV_PROC_ABI(td->td_proc) == SV_ABI_LINUX; 234 NL_LOG(LOG_DEBUG2, "socket %p, %sPID %d: attaching socket to %s", 235 so, is_linux ? "(linux) " : "", curproc->p_pid, 236 nl_get_proto_name(proto)); 237 238 /* Create per-VNET state on first socket init */ 239 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 240 if (ctl == NULL) 241 ctl = vnet_nl_ctl_init(); 242 KASSERT(V_nl_ctl != NULL, ("nl_attach: vnet_sock_init() failed")); 243 244 MPASS(sotonlpcb(so) == NULL); 245 246 nlp = malloc(sizeof(struct nlpcb), M_PCB, M_WAITOK | M_ZERO); 247 error = soreserve(so, nl_sendspace, nl_recvspace); 248 if (error != 0) { 249 free(nlp, M_PCB); 250 return (error); 251 } 252 so->so_pcb = nlp; 253 nlp->nl_socket = so; 254 /* Copy so_cred to avoid having socket_var.h in every header */ 255 nlp->nl_cred = so->so_cred; 256 nlp->nl_proto = proto; 257 nlp->nl_process_id = curproc->p_pid; 258 nlp->nl_linux = is_linux; 259 nlp->nl_active = true; 260 NLP_LOCK_INIT(nlp); 261 refcount_init(&nlp->nl_refcount, 1); 262 nl_init_io(nlp); 263 264 nlp->nl_taskqueue = taskqueue_create("netlink_socket", M_WAITOK, 265 taskqueue_thread_enqueue, &nlp->nl_taskqueue); 266 TASK_INIT(&nlp->nl_task, 0, nl_taskqueue_handler, nlp); 267 taskqueue_start_threads(&nlp->nl_taskqueue, 1, PWAIT, 268 "netlink_socket (PID %u)", nlp->nl_process_id); 269 270 NLCTL_WLOCK(ctl); 271 /* XXX: check ctl is still alive */ 272 CK_LIST_INSERT_HEAD(&ctl->ctl_pcb_head, nlp, nl_next); 273 NLCTL_WUNLOCK(ctl); 274 275 soisconnected(so); 276 277 return (0); 278 } 279 280 static void 281 nl_pru_abort(struct socket *so) 282 { 283 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 284 MPASS(sotonlpcb(so) != NULL); 285 soisdisconnected(so); 286 } 287 288 static int 289 nl_pru_bind(struct socket *so, struct sockaddr *sa, struct thread *td) 290 { 291 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 292 struct nlpcb *nlp = sotonlpcb(so); 293 struct sockaddr_nl *snl = (struct sockaddr_nl *)sa; 294 int error; 295 296 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 297 if (snl->nl_len != sizeof(*snl)) { 298 NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so); 299 return (EINVAL); 300 } 301 302 303 NLCTL_WLOCK(ctl); 304 NLP_LOCK(nlp); 305 error = nl_bind_locked(nlp, snl); 306 NLP_UNLOCK(nlp); 307 NLCTL_WUNLOCK(ctl); 308 NL_LOG(LOG_DEBUG2, "socket %p, bind() to %u, groups %u, error %d", so, 309 snl->nl_pid, snl->nl_groups, error); 310 311 return (error); 312 } 313 314 315 static int 316 nl_assign_port(struct nlpcb *nlp, uint32_t port_id) 317 { 318 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 319 struct sockaddr_nl snl = { 320 .nl_pid = port_id, 321 }; 322 int error; 323 324 NLCTL_WLOCK(ctl); 325 NLP_LOCK(nlp); 326 snl.nl_groups = nlp->nl_groups; 327 error = nl_bind_locked(nlp, &snl); 328 NLP_UNLOCK(nlp); 329 NLCTL_WUNLOCK(ctl); 330 331 NL_LOG(LOG_DEBUG3, "socket %p, port assign: %d, error: %d", nlp->nl_socket, port_id, error); 332 return (error); 333 } 334 335 /* 336 * nl_autobind_port binds a unused portid to @nlp 337 * @nlp: pcb data for the netlink socket 338 * @candidate_id: first id to consider 339 */ 340 static int 341 nl_autobind_port(struct nlpcb *nlp, uint32_t candidate_id) 342 { 343 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 344 uint32_t port_id = candidate_id; 345 NLCTL_TRACKER; 346 bool exist; 347 int error; 348 349 for (int i = 0; i < 10; i++) { 350 NL_LOG(LOG_DEBUG3, "socket %p, trying to assign port %d", nlp->nl_socket, port_id); 351 NLCTL_RLOCK(ctl); 352 exist = nl_port_lookup(port_id) != 0; 353 NLCTL_RUNLOCK(ctl); 354 if (!exist) { 355 error = nl_assign_port(nlp, port_id); 356 if (error != EADDRINUSE) 357 break; 358 } 359 port_id++; 360 } 361 NL_LOG(LOG_DEBUG3, "socket %p, autobind to %d, error: %d", nlp->nl_socket, port_id, error); 362 return (error); 363 } 364 365 static int 366 nl_pru_connect(struct socket *so, struct sockaddr *sa, struct thread *td) 367 { 368 struct sockaddr_nl *snl = (struct sockaddr_nl *)sa; 369 struct nlpcb *nlp; 370 371 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 372 if (snl->nl_len != sizeof(*snl)) { 373 NL_LOG(LOG_DEBUG, "socket %p, wrong sizeof(), ignoring bind()", so); 374 return (EINVAL); 375 } 376 377 nlp = sotonlpcb(so); 378 if (!nlp->nl_bound) { 379 int error = nl_autobind_port(nlp, td->td_proc->p_pid); 380 if (error != 0) { 381 NL_LOG(LOG_DEBUG, "socket %p, nl_autobind() failed: %d", so, error); 382 return (error); 383 } 384 } 385 /* XXX: Handle socket flags & multicast */ 386 soisconnected(so); 387 388 NL_LOG(LOG_DEBUG2, "socket %p, connect to %u", so, snl->nl_pid); 389 390 return (0); 391 } 392 393 static void 394 destroy_nlpcb(struct nlpcb *nlp) 395 { 396 NLP_LOCK(nlp); 397 nl_free_io(nlp); 398 NLP_LOCK_DESTROY(nlp); 399 free(nlp, M_PCB); 400 } 401 402 static void 403 destroy_nlpcb_epoch(epoch_context_t ctx) 404 { 405 struct nlpcb *nlp; 406 407 nlp = __containerof(ctx, struct nlpcb, nl_epoch_ctx); 408 409 destroy_nlpcb(nlp); 410 } 411 412 413 static void 414 nl_pru_detach(struct socket *so) 415 { 416 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 417 MPASS(sotonlpcb(so) != NULL); 418 struct nlpcb *nlp; 419 420 NL_LOG(LOG_DEBUG2, "detaching socket %p, PID %d", so, curproc->p_pid); 421 nlp = sotonlpcb(so); 422 423 /* Mark as inactive so no new work can be enqueued */ 424 NLP_LOCK(nlp); 425 bool was_bound = nlp->nl_bound; 426 nlp->nl_active = false; 427 NLP_UNLOCK(nlp); 428 429 /* Wait till all scheduled work has been completed */ 430 taskqueue_drain_all(nlp->nl_taskqueue); 431 taskqueue_free(nlp->nl_taskqueue); 432 433 NLCTL_WLOCK(ctl); 434 NLP_LOCK(nlp); 435 if (was_bound) { 436 CK_LIST_REMOVE(nlp, nl_port_next); 437 NL_LOG(LOG_DEBUG3, "socket %p, unlinking bound pid %u", so, nlp->nl_port); 438 } 439 CK_LIST_REMOVE(nlp, nl_next); 440 nlp->nl_socket = NULL; 441 NLP_UNLOCK(nlp); 442 NLCTL_WUNLOCK(ctl); 443 444 so->so_pcb = NULL; 445 446 NL_LOG(LOG_DEBUG3, "socket %p, detached", so); 447 448 /* XXX: is delayed free needed? */ 449 epoch_call(net_epoch_preempt, destroy_nlpcb_epoch, &nlp->nl_epoch_ctx); 450 } 451 452 static int 453 nl_pru_disconnect(struct socket *so) 454 { 455 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 456 MPASS(sotonlpcb(so) != NULL); 457 return (ENOTCONN); 458 } 459 460 static int 461 nl_pru_peeraddr(struct socket *so, struct sockaddr **sa) 462 { 463 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 464 MPASS(sotonlpcb(so) != NULL); 465 return (ENOTCONN); 466 } 467 468 static int 469 nl_pru_shutdown(struct socket *so) 470 { 471 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 472 MPASS(sotonlpcb(so) != NULL); 473 socantsendmore(so); 474 return (0); 475 } 476 477 static int 478 nl_pru_sockaddr(struct socket *so, struct sockaddr **sa) 479 { 480 struct sockaddr_nl *snl; 481 482 snl = malloc(sizeof(struct sockaddr_nl), M_SONAME, M_WAITOK | M_ZERO); 483 /* TODO: set other fields */ 484 snl->nl_len = sizeof(struct sockaddr_nl); 485 snl->nl_family = AF_NETLINK; 486 snl->nl_pid = sotonlpcb(so)->nl_port; 487 *sa = (struct sockaddr *)snl; 488 return (0); 489 } 490 491 static void 492 nl_pru_close(struct socket *so) 493 { 494 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 495 MPASS(sotonlpcb(so) != NULL); 496 soisdisconnected(so); 497 } 498 499 static int 500 nl_pru_output(struct mbuf *m, struct socket *so, ...) 501 { 502 503 if (__predict_false(m == NULL || 504 ((m->m_len < sizeof(struct nlmsghdr)) && 505 (m = m_pullup(m, sizeof(struct nlmsghdr))) == NULL))) 506 return (ENOBUFS); 507 MPASS((m->m_flags & M_PKTHDR) != 0); 508 509 NL_LOG(LOG_DEBUG3, "sending message to kernel async processing"); 510 nl_receive_async(m, so); 511 return (0); 512 } 513 514 515 static int 516 nl_pru_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *sa, 517 struct mbuf *control, struct thread *td) 518 { 519 NL_LOG(LOG_DEBUG2, "sending message to kernel"); 520 521 if (__predict_false(control != NULL)) { 522 if (control->m_len) { 523 m_freem(control); 524 return (EINVAL); 525 } 526 m_freem(control); 527 } 528 529 return (nl_pru_output(m, so)); 530 } 531 532 static int 533 nl_pru_rcvd(struct socket *so, int flags) 534 { 535 NL_LOG(LOG_DEBUG3, "socket %p, PID %d", so, curproc->p_pid); 536 MPASS(sotonlpcb(so) != NULL); 537 538 nl_on_transmit(sotonlpcb(so)); 539 540 return (0); 541 } 542 543 static int 544 nl_getoptflag(int sopt_name) 545 { 546 switch (sopt_name) { 547 case NETLINK_CAP_ACK: 548 return (NLF_CAP_ACK); 549 case NETLINK_EXT_ACK: 550 return (NLF_EXT_ACK); 551 case NETLINK_GET_STRICT_CHK: 552 return (NLF_STRICT); 553 } 554 555 return (0); 556 } 557 558 static int 559 nl_ctloutput(struct socket *so, struct sockopt *sopt) 560 { 561 struct nl_control *ctl = atomic_load_ptr(&V_nl_ctl); 562 struct nlpcb *nlp = sotonlpcb(so); 563 uint32_t flag; 564 uint64_t groups, group_mask; 565 int optval, error = 0; 566 NLCTL_TRACKER; 567 568 NL_LOG(LOG_DEBUG2, "%ssockopt(%p, %d)", (sopt->sopt_dir) ? "set" : "get", 569 so, sopt->sopt_name); 570 571 switch (sopt->sopt_dir) { 572 case SOPT_SET: 573 switch (sopt->sopt_name) { 574 case NETLINK_ADD_MEMBERSHIP: 575 case NETLINK_DROP_MEMBERSHIP: 576 sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); 577 if (optval <= 0 || optval >= 64) { 578 error = ERANGE; 579 break; 580 } 581 group_mask = (uint64_t)1 << (optval - 1); 582 NL_LOG(LOG_DEBUG2, "ADD/DEL group %d mask (%X)", 583 (uint32_t)optval, (uint32_t)group_mask); 584 585 NLCTL_WLOCK(ctl); 586 if (sopt->sopt_name == NETLINK_ADD_MEMBERSHIP) 587 groups = nlp->nl_groups | group_mask; 588 else 589 groups = nlp->nl_groups & ~group_mask; 590 nl_update_groups_locked(nlp, groups); 591 NLCTL_WUNLOCK(ctl); 592 break; 593 case NETLINK_CAP_ACK: 594 case NETLINK_EXT_ACK: 595 case NETLINK_GET_STRICT_CHK: 596 sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); 597 598 flag = nl_getoptflag(sopt->sopt_name); 599 600 NLCTL_WLOCK(ctl); 601 if (optval != 0) 602 nlp->nl_flags |= flag; 603 else 604 nlp->nl_flags &= ~flag; 605 NLCTL_WUNLOCK(ctl); 606 break; 607 default: 608 error = ENOPROTOOPT; 609 } 610 break; 611 case SOPT_GET: 612 switch (sopt->sopt_name) { 613 case NETLINK_LIST_MEMBERSHIPS: 614 NLCTL_RLOCK(ctl); 615 optval = nlp->nl_groups; 616 NLCTL_RUNLOCK(ctl); 617 error = sooptcopyout(sopt, &optval, sizeof(optval)); 618 break; 619 case NETLINK_CAP_ACK: 620 case NETLINK_EXT_ACK: 621 case NETLINK_GET_STRICT_CHK: 622 NLCTL_RLOCK(ctl); 623 optval = (nlp->nl_flags & nl_getoptflag(sopt->sopt_name)) != 0; 624 NLCTL_RUNLOCK(ctl); 625 error = sooptcopyout(sopt, &optval, sizeof(optval)); 626 break; 627 default: 628 error = ENOPROTOOPT; 629 } 630 break; 631 default: 632 error = ENOPROTOOPT; 633 } 634 635 return (error); 636 } 637 638 static int 639 nl_setsbopt(struct socket *so, struct sockopt *sopt) 640 { 641 int error, optval; 642 bool result; 643 644 if (sopt->sopt_name != SO_RCVBUF) 645 return (sbsetopt(so, sopt)); 646 647 /* Allow to override max buffer size in certain conditions */ 648 649 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); 650 if (error != 0) 651 return (error); 652 NL_LOG(LOG_DEBUG2, "socket %p, PID %d, SO_RCVBUF=%d", so, curproc->p_pid, optval); 653 if (optval > sb_max_adj) { 654 if (priv_check(curthread, PRIV_NET_ROUTE) != 0) 655 return (EPERM); 656 } 657 658 SOCK_RECVBUF_LOCK(so); 659 result = sbreserve_locked_limit(so, SO_RCV, optval, nl_maxsockbuf, curthread); 660 SOCK_RECVBUF_UNLOCK(so); 661 662 return (result ? 0 : ENOBUFS); 663 } 664 665 static struct protosw netlinksw = { 666 .pr_type = SOCK_RAW, 667 .pr_flags = PR_ATOMIC | PR_ADDR | PR_WANTRCVD, 668 .pr_ctloutput = nl_ctloutput, 669 .pr_setsbopt = nl_setsbopt, 670 .pr_abort = nl_pru_abort, 671 .pr_attach = nl_pru_attach, 672 .pr_bind = nl_pru_bind, 673 .pr_connect = nl_pru_connect, 674 .pr_detach = nl_pru_detach, 675 .pr_disconnect = nl_pru_disconnect, 676 .pr_peeraddr = nl_pru_peeraddr, 677 .pr_send = nl_pru_send, 678 .pr_rcvd = nl_pru_rcvd, 679 .pr_shutdown = nl_pru_shutdown, 680 .pr_sockaddr = nl_pru_sockaddr, 681 .pr_close = nl_pru_close 682 }; 683 684 static struct domain netlinkdomain = { 685 .dom_family = PF_NETLINK, 686 .dom_name = "netlink", 687 .dom_flags = DOMF_UNLOADABLE, 688 .dom_nprotosw = 1, 689 .dom_protosw = { &netlinksw }, 690 }; 691 692 DOMAIN_SET(netlink); 693