1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2010-2011 EIA Electronics, 3 // Pieter Beyens <pieter.beyens@eia.be> 4 // Copyright (c) 2010-2011 EIA Electronics, 5 // Kurt Van Dijck <kurt.van.dijck@eia.be> 6 // Copyright (c) 2018 Protonic, 7 // Robin van der Gracht <robin@protonic.nl> 8 // Copyright (c) 2017-2019 Pengutronix, 9 // Marc Kleine-Budde <kernel@pengutronix.de> 10 // Copyright (c) 2017-2019 Pengutronix, 11 // Oleksij Rempel <kernel@pengutronix.de> 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/can/can-ml.h> 16 #include <linux/can/core.h> 17 #include <linux/can/skb.h> 18 #include <linux/errqueue.h> 19 #include <linux/if_arp.h> 20 21 #include "j1939-priv.h" 22 23 #define J1939_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.j1939) 24 25 /* conversion function between struct sock::sk_priority from linux and 26 * j1939 priority field 27 */ 28 static inline priority_t j1939_prio(u32 sk_priority) 29 { 30 sk_priority = min(sk_priority, 7U); 31 32 return 7 - sk_priority; 33 } 34 35 static inline u32 j1939_to_sk_priority(priority_t prio) 36 { 37 return 7 - prio; 38 } 39 40 /* function to see if pgn is to be evaluated */ 41 static inline bool j1939_pgn_is_valid(pgn_t pgn) 42 { 43 return pgn <= J1939_PGN_MAX; 44 } 45 46 /* test function to avoid non-zero DA placeholder for pdu1 pgn's */ 47 static inline bool j1939_pgn_is_clean_pdu(pgn_t pgn) 48 { 49 if (j1939_pgn_is_pdu1(pgn)) 50 return !(pgn & 0xff); 51 else 52 return true; 53 } 54 55 static inline void j1939_sock_pending_add(struct sock *sk) 56 { 57 struct j1939_sock *jsk = j1939_sk(sk); 58 59 atomic_inc(&jsk->skb_pending); 60 } 61 62 static int j1939_sock_pending_get(struct sock *sk) 63 { 64 struct j1939_sock *jsk = j1939_sk(sk); 65 66 return atomic_read(&jsk->skb_pending); 67 } 68 69 void j1939_sock_pending_del(struct sock *sk) 70 { 71 struct j1939_sock *jsk = j1939_sk(sk); 72 73 /* atomic_dec_return returns the new value */ 74 if (!atomic_dec_return(&jsk->skb_pending)) 75 wake_up(&jsk->waitq); /* no pending SKB's */ 76 } 77 78 static void j1939_jsk_add(struct j1939_priv *priv, struct j1939_sock *jsk) 79 { 80 jsk->state |= J1939_SOCK_BOUND; 81 j1939_priv_get(priv); 82 83 write_lock_bh(&priv->j1939_socks_lock); 84 list_add_tail(&jsk->list, &priv->j1939_socks); 85 write_unlock_bh(&priv->j1939_socks_lock); 86 } 87 88 static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk) 89 { 90 write_lock_bh(&priv->j1939_socks_lock); 91 list_del_init(&jsk->list); 92 write_unlock_bh(&priv->j1939_socks_lock); 93 94 j1939_priv_put(priv); 95 jsk->state &= ~J1939_SOCK_BOUND; 96 } 97 98 static bool j1939_sk_queue_session(struct j1939_session *session) 99 { 100 struct j1939_sock *jsk = j1939_sk(session->sk); 101 bool empty; 102 103 spin_lock_bh(&jsk->sk_session_queue_lock); 104 empty = list_empty(&jsk->sk_session_queue); 105 j1939_session_get(session); 106 list_add_tail(&session->sk_session_queue_entry, &jsk->sk_session_queue); 107 spin_unlock_bh(&jsk->sk_session_queue_lock); 108 j1939_sock_pending_add(&jsk->sk); 109 110 return empty; 111 } 112 113 static struct 114 j1939_session *j1939_sk_get_incomplete_session(struct j1939_sock *jsk) 115 { 116 struct j1939_session *session = NULL; 117 118 spin_lock_bh(&jsk->sk_session_queue_lock); 119 if (!list_empty(&jsk->sk_session_queue)) { 120 session = list_last_entry(&jsk->sk_session_queue, 121 struct j1939_session, 122 sk_session_queue_entry); 123 if (session->total_queued_size == session->total_message_size) 124 session = NULL; 125 else 126 j1939_session_get(session); 127 } 128 spin_unlock_bh(&jsk->sk_session_queue_lock); 129 130 return session; 131 } 132 133 static void j1939_sk_queue_drop_all(struct j1939_priv *priv, 134 struct j1939_sock *jsk, int err) 135 { 136 struct j1939_session *session, *tmp; 137 138 netdev_dbg(priv->ndev, "%s: err: %i\n", __func__, err); 139 spin_lock_bh(&jsk->sk_session_queue_lock); 140 list_for_each_entry_safe(session, tmp, &jsk->sk_session_queue, 141 sk_session_queue_entry) { 142 list_del_init(&session->sk_session_queue_entry); 143 session->err = err; 144 j1939_session_put(session); 145 } 146 spin_unlock_bh(&jsk->sk_session_queue_lock); 147 } 148 149 static void j1939_sk_queue_activate_next_locked(struct j1939_session *session) 150 { 151 struct j1939_sock *jsk; 152 struct j1939_session *first; 153 int err; 154 155 /* RX-Session don't have a socket (yet) */ 156 if (!session->sk) 157 return; 158 159 jsk = j1939_sk(session->sk); 160 lockdep_assert_held(&jsk->sk_session_queue_lock); 161 162 err = session->err; 163 164 first = list_first_entry_or_null(&jsk->sk_session_queue, 165 struct j1939_session, 166 sk_session_queue_entry); 167 168 /* Some else has already activated the next session */ 169 if (first != session) 170 return; 171 172 activate_next: 173 list_del_init(&first->sk_session_queue_entry); 174 j1939_session_put(first); 175 first = list_first_entry_or_null(&jsk->sk_session_queue, 176 struct j1939_session, 177 sk_session_queue_entry); 178 if (!first) 179 return; 180 181 if (j1939_session_activate(first)) { 182 netdev_warn_once(first->priv->ndev, 183 "%s: 0x%p: Identical session is already activated.\n", 184 __func__, first); 185 first->err = -EBUSY; 186 goto activate_next; 187 } else { 188 /* Give receiver some time (arbitrary chosen) to recover */ 189 int time_ms = 0; 190 191 if (err) 192 time_ms = 10 + get_random_u32_below(16); 193 194 j1939_tp_schedule_txtimer(first, time_ms); 195 } 196 } 197 198 void j1939_sk_queue_activate_next(struct j1939_session *session) 199 { 200 struct j1939_sock *jsk; 201 202 if (!session->sk) 203 return; 204 205 jsk = j1939_sk(session->sk); 206 207 spin_lock_bh(&jsk->sk_session_queue_lock); 208 j1939_sk_queue_activate_next_locked(session); 209 spin_unlock_bh(&jsk->sk_session_queue_lock); 210 } 211 212 static bool j1939_sk_match_dst(struct j1939_sock *jsk, 213 const struct j1939_sk_buff_cb *skcb) 214 { 215 if ((jsk->state & J1939_SOCK_PROMISC)) 216 return true; 217 218 /* Destination address filter */ 219 if (jsk->addr.src_name && skcb->addr.dst_name) { 220 if (jsk->addr.src_name != skcb->addr.dst_name) 221 return false; 222 } else { 223 /* receive (all sockets) if 224 * - all packages that match our bind() address 225 * - all broadcast on a socket if SO_BROADCAST 226 * is set 227 */ 228 if (j1939_address_is_unicast(skcb->addr.da)) { 229 if (jsk->addr.sa != skcb->addr.da) 230 return false; 231 } else if (!sock_flag(&jsk->sk, SOCK_BROADCAST)) { 232 /* receiving broadcast without SO_BROADCAST 233 * flag is not allowed 234 */ 235 return false; 236 } 237 } 238 239 /* Source address filter */ 240 if (jsk->state & J1939_SOCK_CONNECTED) { 241 /* receive (all sockets) if 242 * - all packages that match our connect() name or address 243 */ 244 if (jsk->addr.dst_name && skcb->addr.src_name) { 245 if (jsk->addr.dst_name != skcb->addr.src_name) 246 return false; 247 } else { 248 if (jsk->addr.da != skcb->addr.sa) 249 return false; 250 } 251 } 252 253 /* PGN filter */ 254 if (j1939_pgn_is_valid(jsk->pgn_rx_filter) && 255 jsk->pgn_rx_filter != skcb->addr.pgn) 256 return false; 257 258 return true; 259 } 260 261 /* matches skb control buffer (addr) with a j1939 filter */ 262 static bool j1939_sk_match_filter(struct j1939_sock *jsk, 263 const struct j1939_sk_buff_cb *skcb) 264 { 265 const struct j1939_filter *f; 266 int nfilter; 267 268 spin_lock_bh(&jsk->filters_lock); 269 270 f = jsk->filters; 271 nfilter = jsk->nfilters; 272 273 if (!nfilter) 274 /* receive all when no filters are assigned */ 275 goto filter_match_found; 276 277 for (; nfilter; ++f, --nfilter) { 278 if ((skcb->addr.pgn & f->pgn_mask) != f->pgn) 279 continue; 280 if ((skcb->addr.sa & f->addr_mask) != f->addr) 281 continue; 282 if ((skcb->addr.src_name & f->name_mask) != f->name) 283 continue; 284 goto filter_match_found; 285 } 286 287 spin_unlock_bh(&jsk->filters_lock); 288 return false; 289 290 filter_match_found: 291 spin_unlock_bh(&jsk->filters_lock); 292 return true; 293 } 294 295 static bool j1939_sk_recv_match_one(struct j1939_sock *jsk, 296 const struct j1939_sk_buff_cb *skcb) 297 { 298 if (!(jsk->state & J1939_SOCK_BOUND)) 299 return false; 300 301 if (!j1939_sk_match_dst(jsk, skcb)) 302 return false; 303 304 if (!j1939_sk_match_filter(jsk, skcb)) 305 return false; 306 307 return true; 308 } 309 310 static void j1939_sk_recv_one(struct j1939_sock *jsk, struct sk_buff *oskb) 311 { 312 const struct j1939_sk_buff_cb *oskcb = j1939_skb_to_cb(oskb); 313 struct j1939_sk_buff_cb *skcb; 314 enum skb_drop_reason reason; 315 struct sk_buff *skb; 316 317 if (oskb->sk == &jsk->sk) 318 return; 319 320 if (!j1939_sk_recv_match_one(jsk, oskcb)) 321 return; 322 323 skb = skb_clone(oskb, GFP_ATOMIC); 324 if (!skb) { 325 pr_warn("skb clone failed\n"); 326 return; 327 } 328 can_skb_set_owner(skb, oskb->sk); 329 330 skcb = j1939_skb_to_cb(skb); 331 skcb->msg_flags &= ~(MSG_DONTROUTE); 332 if (skb->sk) 333 skcb->msg_flags |= MSG_DONTROUTE; 334 335 if (sock_queue_rcv_skb_reason(&jsk->sk, skb, &reason) < 0) 336 sk_skb_reason_drop(&jsk->sk, skb, reason); 337 } 338 339 bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb) 340 { 341 struct j1939_sock *jsk; 342 bool match = false; 343 344 read_lock_bh(&priv->j1939_socks_lock); 345 list_for_each_entry(jsk, &priv->j1939_socks, list) { 346 match = j1939_sk_recv_match_one(jsk, skcb); 347 if (match) 348 break; 349 } 350 read_unlock_bh(&priv->j1939_socks_lock); 351 352 return match; 353 } 354 355 void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb) 356 { 357 struct j1939_sock *jsk; 358 359 read_lock_bh(&priv->j1939_socks_lock); 360 list_for_each_entry(jsk, &priv->j1939_socks, list) { 361 j1939_sk_recv_one(jsk, skb); 362 } 363 read_unlock_bh(&priv->j1939_socks_lock); 364 } 365 366 static void j1939_sk_sock_destruct(struct sock *sk) 367 { 368 struct j1939_sock *jsk = j1939_sk(sk); 369 370 /* This function will be called by the generic networking code, when 371 * the socket is ultimately closed (sk->sk_destruct). 372 * 373 * The race between 374 * - processing a received CAN frame 375 * (can_receive -> j1939_can_recv) 376 * and accessing j1939_priv 377 * ... and ... 378 * - closing a socket 379 * (j1939_can_rx_unregister -> can_rx_unregister) 380 * and calling the final j1939_priv_put() 381 * 382 * is avoided by calling the final j1939_priv_put() from this 383 * RCU deferred cleanup call. 384 */ 385 if (jsk->priv) { 386 j1939_priv_put(jsk->priv); 387 jsk->priv = NULL; 388 } 389 390 /* call generic CAN sock destruct */ 391 can_sock_destruct(sk); 392 } 393 394 static int j1939_sk_init(struct sock *sk) 395 { 396 struct j1939_sock *jsk = j1939_sk(sk); 397 398 /* Ensure that "sk" is first member in "struct j1939_sock", so that we 399 * can skip it during memset(). 400 */ 401 BUILD_BUG_ON(offsetof(struct j1939_sock, sk) != 0); 402 memset((void *)jsk + sizeof(jsk->sk), 0x0, 403 sizeof(*jsk) - sizeof(jsk->sk)); 404 405 INIT_LIST_HEAD(&jsk->list); 406 init_waitqueue_head(&jsk->waitq); 407 jsk->sk.sk_priority = j1939_to_sk_priority(6); 408 jsk->sk.sk_reuse = 1; /* per default */ 409 jsk->addr.sa = J1939_NO_ADDR; 410 jsk->addr.da = J1939_NO_ADDR; 411 jsk->addr.pgn = J1939_NO_PGN; 412 jsk->pgn_rx_filter = J1939_NO_PGN; 413 atomic_set(&jsk->skb_pending, 0); 414 spin_lock_init(&jsk->sk_session_queue_lock); 415 INIT_LIST_HEAD(&jsk->sk_session_queue); 416 spin_lock_init(&jsk->filters_lock); 417 418 /* j1939_sk_sock_destruct() depends on SOCK_RCU_FREE flag */ 419 sock_set_flag(sk, SOCK_RCU_FREE); 420 sk->sk_destruct = j1939_sk_sock_destruct; 421 sk->sk_protocol = CAN_J1939; 422 423 return 0; 424 } 425 426 static int j1939_sk_sanity_check(struct sockaddr_can *addr, int len) 427 { 428 if (!addr) 429 return -EDESTADDRREQ; 430 if (len < J1939_MIN_NAMELEN) 431 return -EINVAL; 432 if (addr->can_family != AF_CAN) 433 return -EINVAL; 434 if (!addr->can_ifindex) 435 return -ENODEV; 436 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) && 437 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) 438 return -EINVAL; 439 440 return 0; 441 } 442 443 static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len) 444 { 445 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; 446 struct j1939_sock *jsk = j1939_sk(sock->sk); 447 struct j1939_priv *priv; 448 struct sock *sk; 449 struct net *net; 450 int ret = 0; 451 452 ret = j1939_sk_sanity_check(addr, len); 453 if (ret) 454 return ret; 455 456 lock_sock(sock->sk); 457 458 priv = jsk->priv; 459 sk = sock->sk; 460 net = sock_net(sk); 461 462 /* Already bound to an interface? */ 463 if (jsk->state & J1939_SOCK_BOUND) { 464 /* A re-bind() to a different interface is not 465 * supported. 466 */ 467 if (jsk->ifindex != addr->can_ifindex) { 468 ret = -EINVAL; 469 goto out_release_sock; 470 } 471 472 /* drop old references */ 473 j1939_jsk_del(priv, jsk); 474 j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa); 475 } else { 476 struct can_ml_priv *can_ml; 477 struct net_device *ndev; 478 479 ndev = dev_get_by_index(net, addr->can_ifindex); 480 if (!ndev) { 481 ret = -ENODEV; 482 goto out_release_sock; 483 } 484 485 can_ml = can_get_ml_priv(ndev); 486 if (!can_ml) { 487 dev_put(ndev); 488 ret = -ENODEV; 489 goto out_release_sock; 490 } 491 492 if (!(ndev->flags & IFF_UP)) { 493 dev_put(ndev); 494 ret = -ENETDOWN; 495 goto out_release_sock; 496 } 497 498 priv = j1939_netdev_start(ndev); 499 dev_put(ndev); 500 if (IS_ERR(priv)) { 501 ret = PTR_ERR(priv); 502 goto out_release_sock; 503 } 504 505 jsk->ifindex = addr->can_ifindex; 506 507 /* the corresponding j1939_priv_put() is called via 508 * sk->sk_destruct, which points to j1939_sk_sock_destruct() 509 */ 510 j1939_priv_get(priv); 511 jsk->priv = priv; 512 } 513 514 /* set default transmit pgn */ 515 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) 516 jsk->pgn_rx_filter = addr->can_addr.j1939.pgn; 517 jsk->addr.src_name = addr->can_addr.j1939.name; 518 jsk->addr.sa = addr->can_addr.j1939.addr; 519 520 /* get new references */ 521 ret = j1939_local_ecu_get(priv, jsk->addr.src_name, jsk->addr.sa); 522 if (ret) { 523 j1939_netdev_stop(priv); 524 jsk->priv = NULL; 525 synchronize_rcu(); 526 j1939_priv_put(priv); 527 goto out_release_sock; 528 } 529 530 j1939_jsk_add(priv, jsk); 531 532 out_release_sock: /* fall through */ 533 release_sock(sock->sk); 534 535 return ret; 536 } 537 538 static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr, 539 int len, int flags) 540 { 541 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; 542 struct j1939_sock *jsk = j1939_sk(sock->sk); 543 int ret = 0; 544 545 ret = j1939_sk_sanity_check(addr, len); 546 if (ret) 547 return ret; 548 549 lock_sock(sock->sk); 550 551 /* bind() before connect() is mandatory */ 552 if (!(jsk->state & J1939_SOCK_BOUND)) { 553 ret = -EINVAL; 554 goto out_release_sock; 555 } 556 557 /* A connect() to a different interface is not supported. */ 558 if (jsk->ifindex != addr->can_ifindex) { 559 ret = -EINVAL; 560 goto out_release_sock; 561 } 562 563 if (!addr->can_addr.j1939.name && 564 addr->can_addr.j1939.addr == J1939_NO_ADDR && 565 !sock_flag(&jsk->sk, SOCK_BROADCAST)) { 566 /* broadcast, but SO_BROADCAST not set */ 567 ret = -EACCES; 568 goto out_release_sock; 569 } 570 571 jsk->addr.dst_name = addr->can_addr.j1939.name; 572 jsk->addr.da = addr->can_addr.j1939.addr; 573 574 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) 575 jsk->addr.pgn = addr->can_addr.j1939.pgn; 576 577 jsk->state |= J1939_SOCK_CONNECTED; 578 579 out_release_sock: /* fall through */ 580 release_sock(sock->sk); 581 582 return ret; 583 } 584 585 static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr, 586 const struct j1939_sock *jsk, int peer) 587 { 588 /* There are two holes (2 bytes and 3 bytes) to clear to avoid 589 * leaking kernel information to user space. 590 */ 591 memset(addr, 0, J1939_MIN_NAMELEN); 592 593 addr->can_family = AF_CAN; 594 addr->can_ifindex = jsk->ifindex; 595 addr->can_addr.j1939.pgn = jsk->addr.pgn; 596 if (peer) { 597 addr->can_addr.j1939.name = jsk->addr.dst_name; 598 addr->can_addr.j1939.addr = jsk->addr.da; 599 } else { 600 addr->can_addr.j1939.name = jsk->addr.src_name; 601 addr->can_addr.j1939.addr = jsk->addr.sa; 602 } 603 } 604 605 static int j1939_sk_getname(struct socket *sock, struct sockaddr *uaddr, 606 int peer) 607 { 608 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; 609 struct sock *sk = sock->sk; 610 struct j1939_sock *jsk = j1939_sk(sk); 611 int ret = 0; 612 613 lock_sock(sk); 614 615 if (peer && !(jsk->state & J1939_SOCK_CONNECTED)) { 616 ret = -EADDRNOTAVAIL; 617 goto failure; 618 } 619 620 j1939_sk_sock2sockaddr_can(addr, jsk, peer); 621 ret = J1939_MIN_NAMELEN; 622 623 failure: 624 release_sock(sk); 625 626 return ret; 627 } 628 629 static int j1939_sk_release(struct socket *sock) 630 { 631 struct sock *sk = sock->sk; 632 struct j1939_sock *jsk; 633 634 if (!sk) 635 return 0; 636 637 lock_sock(sk); 638 jsk = j1939_sk(sk); 639 640 if (jsk->state & J1939_SOCK_BOUND) { 641 struct j1939_priv *priv = jsk->priv; 642 643 if (wait_event_interruptible(jsk->waitq, 644 !j1939_sock_pending_get(&jsk->sk))) { 645 j1939_cancel_active_session(priv, sk); 646 j1939_sk_queue_drop_all(priv, jsk, ESHUTDOWN); 647 } 648 649 j1939_jsk_del(priv, jsk); 650 651 j1939_local_ecu_put(priv, jsk->addr.src_name, 652 jsk->addr.sa); 653 654 j1939_netdev_stop(priv); 655 } 656 657 kfree(jsk->filters); 658 sock_orphan(sk); 659 sock->sk = NULL; 660 661 release_sock(sk); 662 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 663 sock_put(sk); 664 665 return 0; 666 } 667 668 static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, sockptr_t optval, 669 unsigned int optlen, int flag) 670 { 671 int tmp; 672 673 if (optlen != sizeof(tmp)) 674 return -EINVAL; 675 if (copy_from_sockptr(&tmp, optval, optlen)) 676 return -EFAULT; 677 lock_sock(&jsk->sk); 678 if (tmp) 679 jsk->state |= flag; 680 else 681 jsk->state &= ~flag; 682 release_sock(&jsk->sk); 683 return tmp; 684 } 685 686 static int j1939_sk_setsockopt(struct socket *sock, int level, int optname, 687 sockptr_t optval, unsigned int optlen) 688 { 689 struct sock *sk = sock->sk; 690 struct j1939_sock *jsk = j1939_sk(sk); 691 int tmp, count = 0, ret = 0; 692 struct j1939_filter *filters = NULL, *ofilters; 693 694 if (level != SOL_CAN_J1939) 695 return -EINVAL; 696 697 switch (optname) { 698 case SO_J1939_FILTER: 699 if (!sockptr_is_null(optval) && optlen != 0) { 700 struct j1939_filter *f; 701 int c; 702 703 if (optlen % sizeof(*filters) != 0) 704 return -EINVAL; 705 706 if (optlen > J1939_FILTER_MAX * 707 sizeof(struct j1939_filter)) 708 return -EINVAL; 709 710 count = optlen / sizeof(*filters); 711 filters = memdup_sockptr(optval, optlen); 712 if (IS_ERR(filters)) 713 return PTR_ERR(filters); 714 715 for (f = filters, c = count; c; f++, c--) { 716 f->name &= f->name_mask; 717 f->pgn &= f->pgn_mask; 718 f->addr &= f->addr_mask; 719 } 720 } 721 722 lock_sock(&jsk->sk); 723 spin_lock_bh(&jsk->filters_lock); 724 ofilters = jsk->filters; 725 jsk->filters = filters; 726 jsk->nfilters = count; 727 spin_unlock_bh(&jsk->filters_lock); 728 release_sock(&jsk->sk); 729 kfree(ofilters); 730 return 0; 731 case SO_J1939_PROMISC: 732 return j1939_sk_setsockopt_flag(jsk, optval, optlen, 733 J1939_SOCK_PROMISC); 734 case SO_J1939_ERRQUEUE: 735 ret = j1939_sk_setsockopt_flag(jsk, optval, optlen, 736 J1939_SOCK_ERRQUEUE); 737 if (ret < 0) 738 return ret; 739 740 if (!(jsk->state & J1939_SOCK_ERRQUEUE)) 741 skb_queue_purge(&sk->sk_error_queue); 742 return ret; 743 case SO_J1939_SEND_PRIO: 744 if (optlen != sizeof(tmp)) 745 return -EINVAL; 746 if (copy_from_sockptr(&tmp, optval, optlen)) 747 return -EFAULT; 748 if (tmp < 0 || tmp > 7) 749 return -EDOM; 750 if (tmp < 2 && !capable(CAP_NET_ADMIN)) 751 return -EPERM; 752 lock_sock(&jsk->sk); 753 jsk->sk.sk_priority = j1939_to_sk_priority(tmp); 754 release_sock(&jsk->sk); 755 return 0; 756 default: 757 return -ENOPROTOOPT; 758 } 759 } 760 761 static int j1939_sk_getsockopt(struct socket *sock, int level, int optname, 762 char __user *optval, int __user *optlen) 763 { 764 struct sock *sk = sock->sk; 765 struct j1939_sock *jsk = j1939_sk(sk); 766 int ret, ulen; 767 /* set defaults for using 'int' properties */ 768 int tmp = 0; 769 int len = sizeof(tmp); 770 void *val = &tmp; 771 772 if (level != SOL_CAN_J1939) 773 return -EINVAL; 774 if (get_user(ulen, optlen)) 775 return -EFAULT; 776 if (ulen < 0) 777 return -EINVAL; 778 779 lock_sock(&jsk->sk); 780 switch (optname) { 781 case SO_J1939_PROMISC: 782 tmp = (jsk->state & J1939_SOCK_PROMISC) ? 1 : 0; 783 break; 784 case SO_J1939_ERRQUEUE: 785 tmp = (jsk->state & J1939_SOCK_ERRQUEUE) ? 1 : 0; 786 break; 787 case SO_J1939_SEND_PRIO: 788 tmp = j1939_prio(jsk->sk.sk_priority); 789 break; 790 default: 791 ret = -ENOPROTOOPT; 792 goto no_copy; 793 } 794 795 /* copy to user, based on 'len' & 'val' 796 * but most sockopt's are 'int' properties, and have 'len' & 'val' 797 * left unchanged, but instead modified 'tmp' 798 */ 799 if (len > ulen) 800 ret = -EFAULT; 801 else if (put_user(len, optlen)) 802 ret = -EFAULT; 803 else if (copy_to_user(optval, val, len)) 804 ret = -EFAULT; 805 else 806 ret = 0; 807 no_copy: 808 release_sock(&jsk->sk); 809 return ret; 810 } 811 812 static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg, 813 size_t size, int flags) 814 { 815 struct sock *sk = sock->sk; 816 struct sk_buff *skb; 817 struct j1939_sk_buff_cb *skcb; 818 int ret = 0; 819 820 if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE | MSG_CMSG_COMPAT)) 821 return -EINVAL; 822 823 if (flags & MSG_ERRQUEUE) 824 return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939, 825 SCM_J1939_ERRQUEUE); 826 827 skb = skb_recv_datagram(sk, flags, &ret); 828 if (!skb) 829 return ret; 830 831 if (size < skb->len) 832 msg->msg_flags |= MSG_TRUNC; 833 else 834 size = skb->len; 835 836 ret = memcpy_to_msg(msg, skb->data, size); 837 if (ret < 0) { 838 skb_free_datagram(sk, skb); 839 return ret; 840 } 841 842 skcb = j1939_skb_to_cb(skb); 843 if (j1939_address_is_valid(skcb->addr.da)) 844 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_ADDR, 845 sizeof(skcb->addr.da), &skcb->addr.da); 846 847 if (skcb->addr.dst_name) 848 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_NAME, 849 sizeof(skcb->addr.dst_name), &skcb->addr.dst_name); 850 851 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_PRIO, 852 sizeof(skcb->priority), &skcb->priority); 853 854 if (msg->msg_name) { 855 struct sockaddr_can *paddr = msg->msg_name; 856 857 msg->msg_namelen = J1939_MIN_NAMELEN; 858 memset(msg->msg_name, 0, msg->msg_namelen); 859 paddr->can_family = AF_CAN; 860 paddr->can_ifindex = skb->skb_iif; 861 paddr->can_addr.j1939.name = skcb->addr.src_name; 862 paddr->can_addr.j1939.addr = skcb->addr.sa; 863 paddr->can_addr.j1939.pgn = skcb->addr.pgn; 864 } 865 866 sock_recv_cmsgs(msg, sk, skb); 867 msg->msg_flags |= skcb->msg_flags; 868 skb_free_datagram(sk, skb); 869 870 return size; 871 } 872 873 static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev, 874 struct sock *sk, 875 struct msghdr *msg, size_t size, 876 int *errcode) 877 { 878 struct j1939_sock *jsk = j1939_sk(sk); 879 struct j1939_sk_buff_cb *skcb; 880 struct sk_buff *skb; 881 int ret; 882 883 skb = sock_alloc_send_skb(sk, 884 size + 885 sizeof(struct can_frame) - 886 sizeof(((struct can_frame *)NULL)->data) + 887 sizeof(struct can_skb_priv), 888 msg->msg_flags & MSG_DONTWAIT, &ret); 889 if (!skb) 890 goto failure; 891 892 can_skb_reserve(skb); 893 can_skb_prv(skb)->ifindex = ndev->ifindex; 894 can_skb_prv(skb)->skbcnt = 0; 895 skb_reserve(skb, offsetof(struct can_frame, data)); 896 897 ret = memcpy_from_msg(skb_put(skb, size), msg, size); 898 if (ret < 0) 899 goto free_skb; 900 901 skb->dev = ndev; 902 903 skcb = j1939_skb_to_cb(skb); 904 memset(skcb, 0, sizeof(*skcb)); 905 skcb->addr = jsk->addr; 906 skcb->priority = j1939_prio(READ_ONCE(sk->sk_priority)); 907 908 if (msg->msg_name) { 909 struct sockaddr_can *addr = msg->msg_name; 910 911 if (addr->can_addr.j1939.name || 912 addr->can_addr.j1939.addr != J1939_NO_ADDR) { 913 skcb->addr.dst_name = addr->can_addr.j1939.name; 914 skcb->addr.da = addr->can_addr.j1939.addr; 915 } 916 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) 917 skcb->addr.pgn = addr->can_addr.j1939.pgn; 918 } 919 920 *errcode = ret; 921 return skb; 922 923 free_skb: 924 kfree_skb(skb); 925 failure: 926 *errcode = ret; 927 return NULL; 928 } 929 930 static size_t j1939_sk_opt_stats_get_size(enum j1939_sk_errqueue_type type) 931 { 932 switch (type) { 933 case J1939_ERRQUEUE_RX_RTS: 934 return 935 nla_total_size(sizeof(u32)) + /* J1939_NLA_TOTAL_SIZE */ 936 nla_total_size(sizeof(u32)) + /* J1939_NLA_PGN */ 937 nla_total_size(sizeof(u64)) + /* J1939_NLA_SRC_NAME */ 938 nla_total_size(sizeof(u64)) + /* J1939_NLA_DEST_NAME */ 939 nla_total_size(sizeof(u8)) + /* J1939_NLA_SRC_ADDR */ 940 nla_total_size(sizeof(u8)) + /* J1939_NLA_DEST_ADDR */ 941 0; 942 default: 943 return 944 nla_total_size(sizeof(u32)) + /* J1939_NLA_BYTES_ACKED */ 945 0; 946 } 947 } 948 949 static struct sk_buff * 950 j1939_sk_get_timestamping_opt_stats(struct j1939_session *session, 951 enum j1939_sk_errqueue_type type) 952 { 953 struct sk_buff *stats; 954 u32 size; 955 956 stats = alloc_skb(j1939_sk_opt_stats_get_size(type), GFP_ATOMIC); 957 if (!stats) 958 return NULL; 959 960 if (session->skcb.addr.type == J1939_SIMPLE) 961 size = session->total_message_size; 962 else 963 size = min(session->pkt.tx_acked * 7, 964 session->total_message_size); 965 966 switch (type) { 967 case J1939_ERRQUEUE_RX_RTS: 968 nla_put_u32(stats, J1939_NLA_TOTAL_SIZE, 969 session->total_message_size); 970 nla_put_u32(stats, J1939_NLA_PGN, 971 session->skcb.addr.pgn); 972 nla_put_u64_64bit(stats, J1939_NLA_SRC_NAME, 973 session->skcb.addr.src_name, J1939_NLA_PAD); 974 nla_put_u64_64bit(stats, J1939_NLA_DEST_NAME, 975 session->skcb.addr.dst_name, J1939_NLA_PAD); 976 nla_put_u8(stats, J1939_NLA_SRC_ADDR, 977 session->skcb.addr.sa); 978 nla_put_u8(stats, J1939_NLA_DEST_ADDR, 979 session->skcb.addr.da); 980 break; 981 default: 982 nla_put_u32(stats, J1939_NLA_BYTES_ACKED, size); 983 } 984 985 return stats; 986 } 987 988 static void __j1939_sk_errqueue(struct j1939_session *session, struct sock *sk, 989 enum j1939_sk_errqueue_type type) 990 { 991 struct j1939_priv *priv = session->priv; 992 struct j1939_sock *jsk; 993 struct sock_exterr_skb *serr; 994 struct sk_buff *skb; 995 char *state = "UNK"; 996 u32 tsflags; 997 int err; 998 999 jsk = j1939_sk(sk); 1000 1001 if (!(jsk->state & J1939_SOCK_ERRQUEUE)) 1002 return; 1003 1004 tsflags = READ_ONCE(sk->sk_tsflags); 1005 switch (type) { 1006 case J1939_ERRQUEUE_TX_ACK: 1007 if (!(tsflags & SOF_TIMESTAMPING_TX_ACK)) 1008 return; 1009 break; 1010 case J1939_ERRQUEUE_TX_SCHED: 1011 if (!(tsflags & SOF_TIMESTAMPING_TX_SCHED)) 1012 return; 1013 break; 1014 case J1939_ERRQUEUE_TX_ABORT: 1015 break; 1016 case J1939_ERRQUEUE_RX_RTS: 1017 fallthrough; 1018 case J1939_ERRQUEUE_RX_DPO: 1019 fallthrough; 1020 case J1939_ERRQUEUE_RX_ABORT: 1021 if (!(tsflags & SOF_TIMESTAMPING_RX_SOFTWARE)) 1022 return; 1023 break; 1024 default: 1025 netdev_err(priv->ndev, "Unknown errqueue type %i\n", type); 1026 } 1027 1028 skb = j1939_sk_get_timestamping_opt_stats(session, type); 1029 if (!skb) 1030 return; 1031 1032 skb->tstamp = ktime_get_real(); 1033 1034 BUILD_BUG_ON(sizeof(struct sock_exterr_skb) > sizeof(skb->cb)); 1035 1036 serr = SKB_EXT_ERR(skb); 1037 memset(serr, 0, sizeof(*serr)); 1038 switch (type) { 1039 case J1939_ERRQUEUE_TX_ACK: 1040 serr->ee.ee_errno = ENOMSG; 1041 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; 1042 serr->ee.ee_info = SCM_TSTAMP_ACK; 1043 state = "TX ACK"; 1044 break; 1045 case J1939_ERRQUEUE_TX_SCHED: 1046 serr->ee.ee_errno = ENOMSG; 1047 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; 1048 serr->ee.ee_info = SCM_TSTAMP_SCHED; 1049 state = "TX SCH"; 1050 break; 1051 case J1939_ERRQUEUE_TX_ABORT: 1052 serr->ee.ee_errno = session->err; 1053 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 1054 serr->ee.ee_info = J1939_EE_INFO_TX_ABORT; 1055 state = "TX ABT"; 1056 break; 1057 case J1939_ERRQUEUE_RX_RTS: 1058 serr->ee.ee_errno = ENOMSG; 1059 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 1060 serr->ee.ee_info = J1939_EE_INFO_RX_RTS; 1061 state = "RX RTS"; 1062 break; 1063 case J1939_ERRQUEUE_RX_DPO: 1064 serr->ee.ee_errno = ENOMSG; 1065 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 1066 serr->ee.ee_info = J1939_EE_INFO_RX_DPO; 1067 state = "RX DPO"; 1068 break; 1069 case J1939_ERRQUEUE_RX_ABORT: 1070 serr->ee.ee_errno = session->err; 1071 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 1072 serr->ee.ee_info = J1939_EE_INFO_RX_ABORT; 1073 state = "RX ABT"; 1074 break; 1075 } 1076 1077 serr->opt_stats = true; 1078 if (tsflags & SOF_TIMESTAMPING_OPT_ID) 1079 serr->ee.ee_data = session->tskey; 1080 1081 netdev_dbg(session->priv->ndev, "%s: 0x%p tskey: %i, state: %s\n", 1082 __func__, session, session->tskey, state); 1083 err = sock_queue_err_skb(sk, skb); 1084 1085 if (err) 1086 kfree_skb(skb); 1087 }; 1088 1089 void j1939_sk_errqueue(struct j1939_session *session, 1090 enum j1939_sk_errqueue_type type) 1091 { 1092 struct j1939_priv *priv = session->priv; 1093 struct j1939_sock *jsk; 1094 1095 if (session->sk) { 1096 /* send TX notifications to the socket of origin */ 1097 __j1939_sk_errqueue(session, session->sk, type); 1098 return; 1099 } 1100 1101 /* spread RX notifications to all sockets subscribed to this session */ 1102 read_lock_bh(&priv->j1939_socks_lock); 1103 list_for_each_entry(jsk, &priv->j1939_socks, list) { 1104 if (j1939_sk_recv_match_one(jsk, &session->skcb)) 1105 __j1939_sk_errqueue(session, &jsk->sk, type); 1106 } 1107 read_unlock_bh(&priv->j1939_socks_lock); 1108 }; 1109 1110 void j1939_sk_send_loop_abort(struct sock *sk, int err) 1111 { 1112 struct j1939_sock *jsk = j1939_sk(sk); 1113 1114 if (jsk->state & J1939_SOCK_ERRQUEUE) 1115 return; 1116 1117 sk->sk_err = err; 1118 1119 sk_error_report(sk); 1120 } 1121 1122 static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk, 1123 struct msghdr *msg, size_t size) 1124 1125 { 1126 struct j1939_sock *jsk = j1939_sk(sk); 1127 struct j1939_session *session = j1939_sk_get_incomplete_session(jsk); 1128 struct sk_buff *skb; 1129 size_t segment_size, todo_size; 1130 int ret = 0; 1131 1132 if (session && 1133 session->total_message_size != session->total_queued_size + size) { 1134 j1939_session_put(session); 1135 return -EIO; 1136 } 1137 1138 todo_size = size; 1139 1140 do { 1141 struct j1939_sk_buff_cb *skcb; 1142 1143 segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE, 1144 todo_size); 1145 1146 /* Allocate skb for one segment */ 1147 skb = j1939_sk_alloc_skb(priv->ndev, sk, msg, segment_size, 1148 &ret); 1149 if (ret) 1150 break; 1151 1152 skcb = j1939_skb_to_cb(skb); 1153 1154 if (!session) { 1155 /* at this point the size should be full size 1156 * of the session 1157 */ 1158 skcb->offset = 0; 1159 session = j1939_tp_send(priv, skb, size); 1160 if (IS_ERR(session)) { 1161 ret = PTR_ERR(session); 1162 goto kfree_skb; 1163 } 1164 if (j1939_sk_queue_session(session)) { 1165 /* try to activate session if we a 1166 * fist in the queue 1167 */ 1168 if (!j1939_session_activate(session)) { 1169 j1939_tp_schedule_txtimer(session, 0); 1170 } else { 1171 ret = -EBUSY; 1172 session->err = ret; 1173 j1939_sk_queue_drop_all(priv, jsk, 1174 EBUSY); 1175 break; 1176 } 1177 } 1178 } else { 1179 skcb->offset = session->total_queued_size; 1180 j1939_session_skb_queue(session, skb); 1181 } 1182 1183 todo_size -= segment_size; 1184 session->total_queued_size += segment_size; 1185 } while (todo_size); 1186 1187 switch (ret) { 1188 case 0: /* OK */ 1189 if (todo_size) 1190 netdev_warn(priv->ndev, 1191 "no error found and not completely queued?! %zu\n", 1192 todo_size); 1193 ret = size; 1194 break; 1195 case -ERESTARTSYS: 1196 ret = -EINTR; 1197 fallthrough; 1198 case -EAGAIN: /* OK */ 1199 if (todo_size != size) 1200 ret = size - todo_size; 1201 break; 1202 default: /* ERROR */ 1203 break; 1204 } 1205 1206 if (session) 1207 j1939_session_put(session); 1208 1209 return ret; 1210 1211 kfree_skb: 1212 kfree_skb(skb); 1213 return ret; 1214 } 1215 1216 static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg, 1217 size_t size) 1218 { 1219 struct sock *sk = sock->sk; 1220 struct j1939_sock *jsk = j1939_sk(sk); 1221 struct j1939_priv *priv; 1222 int ifindex; 1223 int ret; 1224 1225 lock_sock(sock->sk); 1226 /* various socket state tests */ 1227 if (!(jsk->state & J1939_SOCK_BOUND)) { 1228 ret = -EBADFD; 1229 goto sendmsg_done; 1230 } 1231 1232 priv = jsk->priv; 1233 ifindex = jsk->ifindex; 1234 1235 if (!jsk->addr.src_name && jsk->addr.sa == J1939_NO_ADDR) { 1236 /* no source address assigned yet */ 1237 ret = -EBADFD; 1238 goto sendmsg_done; 1239 } 1240 1241 /* deal with provided destination address info */ 1242 if (msg->msg_name) { 1243 struct sockaddr_can *addr = msg->msg_name; 1244 1245 if (msg->msg_namelen < J1939_MIN_NAMELEN) { 1246 ret = -EINVAL; 1247 goto sendmsg_done; 1248 } 1249 1250 if (addr->can_family != AF_CAN) { 1251 ret = -EINVAL; 1252 goto sendmsg_done; 1253 } 1254 1255 if (addr->can_ifindex && addr->can_ifindex != ifindex) { 1256 ret = -EBADFD; 1257 goto sendmsg_done; 1258 } 1259 1260 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) && 1261 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) { 1262 ret = -EINVAL; 1263 goto sendmsg_done; 1264 } 1265 1266 if (!addr->can_addr.j1939.name && 1267 addr->can_addr.j1939.addr == J1939_NO_ADDR && 1268 !sock_flag(sk, SOCK_BROADCAST)) { 1269 /* broadcast, but SO_BROADCAST not set */ 1270 ret = -EACCES; 1271 goto sendmsg_done; 1272 } 1273 } else { 1274 if (!jsk->addr.dst_name && jsk->addr.da == J1939_NO_ADDR && 1275 !sock_flag(sk, SOCK_BROADCAST)) { 1276 /* broadcast, but SO_BROADCAST not set */ 1277 ret = -EACCES; 1278 goto sendmsg_done; 1279 } 1280 } 1281 1282 ret = j1939_sk_send_loop(priv, sk, msg, size); 1283 1284 sendmsg_done: 1285 release_sock(sock->sk); 1286 1287 return ret; 1288 } 1289 1290 void j1939_sk_netdev_event_netdown(struct j1939_priv *priv) 1291 { 1292 struct j1939_sock *jsk; 1293 int error_code = ENETDOWN; 1294 1295 read_lock_bh(&priv->j1939_socks_lock); 1296 list_for_each_entry(jsk, &priv->j1939_socks, list) { 1297 jsk->sk.sk_err = error_code; 1298 if (!sock_flag(&jsk->sk, SOCK_DEAD)) 1299 sk_error_report(&jsk->sk); 1300 1301 j1939_sk_queue_drop_all(priv, jsk, error_code); 1302 } 1303 read_unlock_bh(&priv->j1939_socks_lock); 1304 } 1305 1306 void j1939_sk_netdev_event_unregister(struct j1939_priv *priv) 1307 { 1308 struct sock *sk; 1309 struct j1939_sock *jsk; 1310 bool wait_rcu = false; 1311 1312 rescan: /* The caller is holding a ref on this "priv" via j1939_priv_get_by_ndev(). */ 1313 read_lock_bh(&priv->j1939_socks_lock); 1314 list_for_each_entry(jsk, &priv->j1939_socks, list) { 1315 /* Skip if j1939_jsk_add() is not called on this socket. */ 1316 if (!(jsk->state & J1939_SOCK_BOUND)) 1317 continue; 1318 sk = &jsk->sk; 1319 sock_hold(sk); 1320 read_unlock_bh(&priv->j1939_socks_lock); 1321 /* Check if j1939_jsk_del() is not yet called on this socket after holding 1322 * socket's lock, for both j1939_sk_bind() and j1939_sk_release() call 1323 * j1939_jsk_del() with socket's lock held. 1324 */ 1325 lock_sock(sk); 1326 if (jsk->state & J1939_SOCK_BOUND) { 1327 /* Neither j1939_sk_bind() nor j1939_sk_release() called j1939_jsk_del(). 1328 * Make this socket no longer bound, by pretending as if j1939_sk_bind() 1329 * dropped old references but did not get new references. 1330 */ 1331 j1939_jsk_del(priv, jsk); 1332 j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa); 1333 j1939_netdev_stop(priv); 1334 /* Call j1939_priv_put() now and prevent j1939_sk_sock_destruct() from 1335 * calling the corresponding j1939_priv_put(). 1336 * 1337 * j1939_sk_sock_destruct() is supposed to call j1939_priv_put() after 1338 * an RCU grace period. But since the caller is holding a ref on this 1339 * "priv", we can defer synchronize_rcu() until immediately before 1340 * the caller calls j1939_priv_put(). 1341 */ 1342 j1939_priv_put(priv); 1343 jsk->priv = NULL; 1344 wait_rcu = true; 1345 } 1346 release_sock(sk); 1347 sock_put(sk); 1348 goto rescan; 1349 } 1350 read_unlock_bh(&priv->j1939_socks_lock); 1351 if (wait_rcu) 1352 synchronize_rcu(); 1353 } 1354 1355 static int j1939_sk_no_ioctlcmd(struct socket *sock, unsigned int cmd, 1356 unsigned long arg) 1357 { 1358 /* no ioctls for socket layer -> hand it down to NIC layer */ 1359 return -ENOIOCTLCMD; 1360 } 1361 1362 static const struct proto_ops j1939_ops = { 1363 .family = PF_CAN, 1364 .release = j1939_sk_release, 1365 .bind = j1939_sk_bind, 1366 .connect = j1939_sk_connect, 1367 .socketpair = sock_no_socketpair, 1368 .accept = sock_no_accept, 1369 .getname = j1939_sk_getname, 1370 .poll = datagram_poll, 1371 .ioctl = j1939_sk_no_ioctlcmd, 1372 .listen = sock_no_listen, 1373 .shutdown = sock_no_shutdown, 1374 .setsockopt = j1939_sk_setsockopt, 1375 .getsockopt = j1939_sk_getsockopt, 1376 .sendmsg = j1939_sk_sendmsg, 1377 .recvmsg = j1939_sk_recvmsg, 1378 .mmap = sock_no_mmap, 1379 }; 1380 1381 static struct proto j1939_proto __read_mostly = { 1382 .name = "CAN_J1939", 1383 .owner = THIS_MODULE, 1384 .obj_size = sizeof(struct j1939_sock), 1385 .init = j1939_sk_init, 1386 }; 1387 1388 const struct can_proto j1939_can_proto = { 1389 .type = SOCK_DGRAM, 1390 .protocol = CAN_J1939, 1391 .ops = &j1939_ops, 1392 .prot = &j1939_proto, 1393 }; 1394