b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 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 | spin_lock_bh(&priv->j1939_socks_lock); |
| 84 | list_add_tail(&jsk->list, &priv->j1939_socks); |
| 85 | spin_unlock_bh(&priv->j1939_socks_lock); |
| 86 | } |
| 87 | |
| 88 | static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk) |
| 89 | { |
| 90 | spin_lock_bh(&priv->j1939_socks_lock); |
| 91 | list_del_init(&jsk->list); |
| 92 | spin_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 + prandom_u32_max(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 | struct sk_buff *skb; |
| 315 | |
| 316 | if (oskb->sk == &jsk->sk) |
| 317 | return; |
| 318 | |
| 319 | if (!j1939_sk_recv_match_one(jsk, oskcb)) |
| 320 | return; |
| 321 | |
| 322 | skb = skb_clone(oskb, GFP_ATOMIC); |
| 323 | if (!skb) { |
| 324 | pr_warn("skb clone failed\n"); |
| 325 | return; |
| 326 | } |
| 327 | can_skb_set_owner(skb, oskb->sk); |
| 328 | |
| 329 | skcb = j1939_skb_to_cb(skb); |
| 330 | skcb->msg_flags &= ~(MSG_DONTROUTE); |
| 331 | if (skb->sk) |
| 332 | skcb->msg_flags |= MSG_DONTROUTE; |
| 333 | |
| 334 | if (sock_queue_rcv_skb(&jsk->sk, skb) < 0) |
| 335 | kfree_skb(skb); |
| 336 | } |
| 337 | |
| 338 | bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb) |
| 339 | { |
| 340 | struct j1939_sock *jsk; |
| 341 | bool match = false; |
| 342 | |
| 343 | spin_lock_bh(&priv->j1939_socks_lock); |
| 344 | list_for_each_entry(jsk, &priv->j1939_socks, list) { |
| 345 | match = j1939_sk_recv_match_one(jsk, skcb); |
| 346 | if (match) |
| 347 | break; |
| 348 | } |
| 349 | spin_unlock_bh(&priv->j1939_socks_lock); |
| 350 | |
| 351 | return match; |
| 352 | } |
| 353 | |
| 354 | void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb) |
| 355 | { |
| 356 | struct j1939_sock *jsk; |
| 357 | |
| 358 | spin_lock_bh(&priv->j1939_socks_lock); |
| 359 | list_for_each_entry(jsk, &priv->j1939_socks, list) { |
| 360 | j1939_sk_recv_one(jsk, skb); |
| 361 | } |
| 362 | spin_unlock_bh(&priv->j1939_socks_lock); |
| 363 | } |
| 364 | |
| 365 | static void j1939_sk_sock_destruct(struct sock *sk) |
| 366 | { |
| 367 | struct j1939_sock *jsk = j1939_sk(sk); |
| 368 | |
| 369 | /* This function will be call by the generic networking code, when then |
| 370 | * the socket is ultimately closed (sk->sk_destruct). |
| 371 | * |
| 372 | * The race between |
| 373 | * - processing a received CAN frame |
| 374 | * (can_receive -> j1939_can_recv) |
| 375 | * and accessing j1939_priv |
| 376 | * ... and ... |
| 377 | * - closing a socket |
| 378 | * (j1939_can_rx_unregister -> can_rx_unregister) |
| 379 | * and calling the final j1939_priv_put() |
| 380 | * |
| 381 | * is avoided by calling the final j1939_priv_put() from this |
| 382 | * RCU deferred cleanup call. |
| 383 | */ |
| 384 | if (jsk->priv) { |
| 385 | j1939_priv_put(jsk->priv); |
| 386 | jsk->priv = NULL; |
| 387 | } |
| 388 | |
| 389 | /* call generic CAN sock destruct */ |
| 390 | can_sock_destruct(sk); |
| 391 | } |
| 392 | |
| 393 | static int j1939_sk_init(struct sock *sk) |
| 394 | { |
| 395 | struct j1939_sock *jsk = j1939_sk(sk); |
| 396 | |
| 397 | /* Ensure that "sk" is first member in "struct j1939_sock", so that we |
| 398 | * can skip it during memset(). |
| 399 | */ |
| 400 | BUILD_BUG_ON(offsetof(struct j1939_sock, sk) != 0); |
| 401 | memset((void *)jsk + sizeof(jsk->sk), 0x0, |
| 402 | sizeof(*jsk) - sizeof(jsk->sk)); |
| 403 | |
| 404 | INIT_LIST_HEAD(&jsk->list); |
| 405 | init_waitqueue_head(&jsk->waitq); |
| 406 | jsk->sk.sk_priority = j1939_to_sk_priority(6); |
| 407 | jsk->sk.sk_reuse = 1; /* per default */ |
| 408 | jsk->addr.sa = J1939_NO_ADDR; |
| 409 | jsk->addr.da = J1939_NO_ADDR; |
| 410 | jsk->addr.pgn = J1939_NO_PGN; |
| 411 | jsk->pgn_rx_filter = J1939_NO_PGN; |
| 412 | atomic_set(&jsk->skb_pending, 0); |
| 413 | spin_lock_init(&jsk->sk_session_queue_lock); |
| 414 | INIT_LIST_HEAD(&jsk->sk_session_queue); |
| 415 | spin_lock_init(&jsk->filters_lock); |
| 416 | |
| 417 | /* j1939_sk_sock_destruct() depends on SOCK_RCU_FREE flag */ |
| 418 | sock_set_flag(sk, SOCK_RCU_FREE); |
| 419 | sk->sk_destruct = j1939_sk_sock_destruct; |
| 420 | sk->sk_protocol = CAN_J1939; |
| 421 | |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static int j1939_sk_sanity_check(struct sockaddr_can *addr, int len) |
| 426 | { |
| 427 | if (!addr) |
| 428 | return -EDESTADDRREQ; |
| 429 | if (len < J1939_MIN_NAMELEN) |
| 430 | return -EINVAL; |
| 431 | if (addr->can_family != AF_CAN) |
| 432 | return -EINVAL; |
| 433 | if (!addr->can_ifindex) |
| 434 | return -ENODEV; |
| 435 | if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) && |
| 436 | !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) |
| 437 | return -EINVAL; |
| 438 | |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len) |
| 443 | { |
| 444 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 445 | struct j1939_sock *jsk = j1939_sk(sock->sk); |
| 446 | struct j1939_priv *priv; |
| 447 | struct sock *sk; |
| 448 | struct net *net; |
| 449 | int ret = 0; |
| 450 | |
| 451 | ret = j1939_sk_sanity_check(addr, len); |
| 452 | if (ret) |
| 453 | return ret; |
| 454 | |
| 455 | lock_sock(sock->sk); |
| 456 | |
| 457 | priv = jsk->priv; |
| 458 | sk = sock->sk; |
| 459 | net = sock_net(sk); |
| 460 | |
| 461 | /* Already bound to an interface? */ |
| 462 | if (jsk->state & J1939_SOCK_BOUND) { |
| 463 | /* A re-bind() to a different interface is not |
| 464 | * supported. |
| 465 | */ |
| 466 | if (jsk->ifindex != addr->can_ifindex) { |
| 467 | ret = -EINVAL; |
| 468 | goto out_release_sock; |
| 469 | } |
| 470 | |
| 471 | /* drop old references */ |
| 472 | j1939_jsk_del(priv, jsk); |
| 473 | j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa); |
| 474 | } else { |
| 475 | struct can_ml_priv *can_ml; |
| 476 | struct net_device *ndev; |
| 477 | |
| 478 | ndev = dev_get_by_index(net, addr->can_ifindex); |
| 479 | if (!ndev) { |
| 480 | ret = -ENODEV; |
| 481 | goto out_release_sock; |
| 482 | } |
| 483 | |
| 484 | can_ml = can_get_ml_priv(ndev); |
| 485 | if (!can_ml) { |
| 486 | dev_put(ndev); |
| 487 | ret = -ENODEV; |
| 488 | goto out_release_sock; |
| 489 | } |
| 490 | |
| 491 | if (!(ndev->flags & IFF_UP)) { |
| 492 | dev_put(ndev); |
| 493 | ret = -ENETDOWN; |
| 494 | goto out_release_sock; |
| 495 | } |
| 496 | |
| 497 | priv = j1939_netdev_start(ndev); |
| 498 | dev_put(ndev); |
| 499 | if (IS_ERR(priv)) { |
| 500 | ret = PTR_ERR(priv); |
| 501 | goto out_release_sock; |
| 502 | } |
| 503 | |
| 504 | jsk->ifindex = addr->can_ifindex; |
| 505 | |
| 506 | /* the corresponding j1939_priv_put() is called via |
| 507 | * sk->sk_destruct, which points to j1939_sk_sock_destruct() |
| 508 | */ |
| 509 | j1939_priv_get(priv); |
| 510 | jsk->priv = priv; |
| 511 | } |
| 512 | |
| 513 | /* set default transmit pgn */ |
| 514 | if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) |
| 515 | jsk->pgn_rx_filter = addr->can_addr.j1939.pgn; |
| 516 | jsk->addr.src_name = addr->can_addr.j1939.name; |
| 517 | jsk->addr.sa = addr->can_addr.j1939.addr; |
| 518 | |
| 519 | /* get new references */ |
| 520 | ret = j1939_local_ecu_get(priv, jsk->addr.src_name, jsk->addr.sa); |
| 521 | if (ret) { |
| 522 | j1939_netdev_stop(priv); |
| 523 | goto out_release_sock; |
| 524 | } |
| 525 | |
| 526 | j1939_jsk_add(priv, jsk); |
| 527 | |
| 528 | out_release_sock: /* fall through */ |
| 529 | release_sock(sock->sk); |
| 530 | |
| 531 | return ret; |
| 532 | } |
| 533 | |
| 534 | static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr, |
| 535 | int len, int flags) |
| 536 | { |
| 537 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 538 | struct j1939_sock *jsk = j1939_sk(sock->sk); |
| 539 | int ret = 0; |
| 540 | |
| 541 | ret = j1939_sk_sanity_check(addr, len); |
| 542 | if (ret) |
| 543 | return ret; |
| 544 | |
| 545 | lock_sock(sock->sk); |
| 546 | |
| 547 | /* bind() before connect() is mandatory */ |
| 548 | if (!(jsk->state & J1939_SOCK_BOUND)) { |
| 549 | ret = -EINVAL; |
| 550 | goto out_release_sock; |
| 551 | } |
| 552 | |
| 553 | /* A connect() to a different interface is not supported. */ |
| 554 | if (jsk->ifindex != addr->can_ifindex) { |
| 555 | ret = -EINVAL; |
| 556 | goto out_release_sock; |
| 557 | } |
| 558 | |
| 559 | if (!addr->can_addr.j1939.name && |
| 560 | addr->can_addr.j1939.addr == J1939_NO_ADDR && |
| 561 | !sock_flag(&jsk->sk, SOCK_BROADCAST)) { |
| 562 | /* broadcast, but SO_BROADCAST not set */ |
| 563 | ret = -EACCES; |
| 564 | goto out_release_sock; |
| 565 | } |
| 566 | |
| 567 | jsk->addr.dst_name = addr->can_addr.j1939.name; |
| 568 | jsk->addr.da = addr->can_addr.j1939.addr; |
| 569 | |
| 570 | if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) |
| 571 | jsk->addr.pgn = addr->can_addr.j1939.pgn; |
| 572 | |
| 573 | jsk->state |= J1939_SOCK_CONNECTED; |
| 574 | |
| 575 | out_release_sock: /* fall through */ |
| 576 | release_sock(sock->sk); |
| 577 | |
| 578 | return ret; |
| 579 | } |
| 580 | |
| 581 | static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr, |
| 582 | const struct j1939_sock *jsk, int peer) |
| 583 | { |
| 584 | /* There are two holes (2 bytes and 3 bytes) to clear to avoid |
| 585 | * leaking kernel information to user space. |
| 586 | */ |
| 587 | memset(addr, 0, J1939_MIN_NAMELEN); |
| 588 | |
| 589 | addr->can_family = AF_CAN; |
| 590 | addr->can_ifindex = jsk->ifindex; |
| 591 | addr->can_addr.j1939.pgn = jsk->addr.pgn; |
| 592 | if (peer) { |
| 593 | addr->can_addr.j1939.name = jsk->addr.dst_name; |
| 594 | addr->can_addr.j1939.addr = jsk->addr.da; |
| 595 | } else { |
| 596 | addr->can_addr.j1939.name = jsk->addr.src_name; |
| 597 | addr->can_addr.j1939.addr = jsk->addr.sa; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | static int j1939_sk_getname(struct socket *sock, struct sockaddr *uaddr, |
| 602 | int peer) |
| 603 | { |
| 604 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 605 | struct sock *sk = sock->sk; |
| 606 | struct j1939_sock *jsk = j1939_sk(sk); |
| 607 | int ret = 0; |
| 608 | |
| 609 | lock_sock(sk); |
| 610 | |
| 611 | if (peer && !(jsk->state & J1939_SOCK_CONNECTED)) { |
| 612 | ret = -EADDRNOTAVAIL; |
| 613 | goto failure; |
| 614 | } |
| 615 | |
| 616 | j1939_sk_sock2sockaddr_can(addr, jsk, peer); |
| 617 | ret = J1939_MIN_NAMELEN; |
| 618 | |
| 619 | failure: |
| 620 | release_sock(sk); |
| 621 | |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | static int j1939_sk_release(struct socket *sock) |
| 626 | { |
| 627 | struct sock *sk = sock->sk; |
| 628 | struct j1939_sock *jsk; |
| 629 | |
| 630 | if (!sk) |
| 631 | return 0; |
| 632 | |
| 633 | lock_sock(sk); |
| 634 | jsk = j1939_sk(sk); |
| 635 | |
| 636 | if (jsk->state & J1939_SOCK_BOUND) { |
| 637 | struct j1939_priv *priv = jsk->priv; |
| 638 | |
| 639 | if (wait_event_interruptible(jsk->waitq, |
| 640 | !j1939_sock_pending_get(&jsk->sk))) { |
| 641 | j1939_cancel_active_session(priv, sk); |
| 642 | j1939_sk_queue_drop_all(priv, jsk, ESHUTDOWN); |
| 643 | } |
| 644 | |
| 645 | j1939_jsk_del(priv, jsk); |
| 646 | |
| 647 | j1939_local_ecu_put(priv, jsk->addr.src_name, |
| 648 | jsk->addr.sa); |
| 649 | |
| 650 | j1939_netdev_stop(priv); |
| 651 | } |
| 652 | |
| 653 | kfree(jsk->filters); |
| 654 | sock_orphan(sk); |
| 655 | sock->sk = NULL; |
| 656 | |
| 657 | release_sock(sk); |
| 658 | sock_put(sk); |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval, |
| 664 | unsigned int optlen, int flag) |
| 665 | { |
| 666 | int tmp; |
| 667 | |
| 668 | if (optlen != sizeof(tmp)) |
| 669 | return -EINVAL; |
| 670 | if (copy_from_user(&tmp, optval, optlen)) |
| 671 | return -EFAULT; |
| 672 | lock_sock(&jsk->sk); |
| 673 | if (tmp) |
| 674 | jsk->state |= flag; |
| 675 | else |
| 676 | jsk->state &= ~flag; |
| 677 | release_sock(&jsk->sk); |
| 678 | return tmp; |
| 679 | } |
| 680 | |
| 681 | static int j1939_sk_setsockopt(struct socket *sock, int level, int optname, |
| 682 | char __user *optval, unsigned int optlen) |
| 683 | { |
| 684 | struct sock *sk = sock->sk; |
| 685 | struct j1939_sock *jsk = j1939_sk(sk); |
| 686 | int tmp, count = 0, ret = 0; |
| 687 | struct j1939_filter *filters = NULL, *ofilters; |
| 688 | |
| 689 | if (level != SOL_CAN_J1939) |
| 690 | return -EINVAL; |
| 691 | |
| 692 | switch (optname) { |
| 693 | case SO_J1939_FILTER: |
| 694 | if (optval) { |
| 695 | struct j1939_filter *f; |
| 696 | int c; |
| 697 | |
| 698 | if (optlen % sizeof(*filters) != 0) |
| 699 | return -EINVAL; |
| 700 | |
| 701 | if (optlen > J1939_FILTER_MAX * |
| 702 | sizeof(struct j1939_filter)) |
| 703 | return -EINVAL; |
| 704 | |
| 705 | count = optlen / sizeof(*filters); |
| 706 | filters = memdup_user(optval, optlen); |
| 707 | if (IS_ERR(filters)) |
| 708 | return PTR_ERR(filters); |
| 709 | |
| 710 | for (f = filters, c = count; c; f++, c--) { |
| 711 | f->name &= f->name_mask; |
| 712 | f->pgn &= f->pgn_mask; |
| 713 | f->addr &= f->addr_mask; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | lock_sock(&jsk->sk); |
| 718 | spin_lock_bh(&jsk->filters_lock); |
| 719 | ofilters = jsk->filters; |
| 720 | jsk->filters = filters; |
| 721 | jsk->nfilters = count; |
| 722 | spin_unlock_bh(&jsk->filters_lock); |
| 723 | release_sock(&jsk->sk); |
| 724 | kfree(ofilters); |
| 725 | return 0; |
| 726 | case SO_J1939_PROMISC: |
| 727 | return j1939_sk_setsockopt_flag(jsk, optval, optlen, |
| 728 | J1939_SOCK_PROMISC); |
| 729 | case SO_J1939_ERRQUEUE: |
| 730 | ret = j1939_sk_setsockopt_flag(jsk, optval, optlen, |
| 731 | J1939_SOCK_ERRQUEUE); |
| 732 | if (ret < 0) |
| 733 | return ret; |
| 734 | |
| 735 | if (!(jsk->state & J1939_SOCK_ERRQUEUE)) |
| 736 | skb_queue_purge(&sk->sk_error_queue); |
| 737 | return ret; |
| 738 | case SO_J1939_SEND_PRIO: |
| 739 | if (optlen != sizeof(tmp)) |
| 740 | return -EINVAL; |
| 741 | if (copy_from_user(&tmp, optval, optlen)) |
| 742 | return -EFAULT; |
| 743 | if (tmp < 0 || tmp > 7) |
| 744 | return -EDOM; |
| 745 | if (tmp < 2 && !capable(CAP_NET_ADMIN)) |
| 746 | return -EPERM; |
| 747 | lock_sock(&jsk->sk); |
| 748 | jsk->sk.sk_priority = j1939_to_sk_priority(tmp); |
| 749 | release_sock(&jsk->sk); |
| 750 | return 0; |
| 751 | default: |
| 752 | return -ENOPROTOOPT; |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | static int j1939_sk_getsockopt(struct socket *sock, int level, int optname, |
| 757 | char __user *optval, int __user *optlen) |
| 758 | { |
| 759 | struct sock *sk = sock->sk; |
| 760 | struct j1939_sock *jsk = j1939_sk(sk); |
| 761 | int ret, ulen; |
| 762 | /* set defaults for using 'int' properties */ |
| 763 | int tmp = 0; |
| 764 | int len = sizeof(tmp); |
| 765 | void *val = &tmp; |
| 766 | |
| 767 | if (level != SOL_CAN_J1939) |
| 768 | return -EINVAL; |
| 769 | if (get_user(ulen, optlen)) |
| 770 | return -EFAULT; |
| 771 | if (ulen < 0) |
| 772 | return -EINVAL; |
| 773 | |
| 774 | lock_sock(&jsk->sk); |
| 775 | switch (optname) { |
| 776 | case SO_J1939_PROMISC: |
| 777 | tmp = (jsk->state & J1939_SOCK_PROMISC) ? 1 : 0; |
| 778 | break; |
| 779 | case SO_J1939_ERRQUEUE: |
| 780 | tmp = (jsk->state & J1939_SOCK_ERRQUEUE) ? 1 : 0; |
| 781 | break; |
| 782 | case SO_J1939_SEND_PRIO: |
| 783 | tmp = j1939_prio(jsk->sk.sk_priority); |
| 784 | break; |
| 785 | default: |
| 786 | ret = -ENOPROTOOPT; |
| 787 | goto no_copy; |
| 788 | } |
| 789 | |
| 790 | /* copy to user, based on 'len' & 'val' |
| 791 | * but most sockopt's are 'int' properties, and have 'len' & 'val' |
| 792 | * left unchanged, but instead modified 'tmp' |
| 793 | */ |
| 794 | if (len > ulen) |
| 795 | ret = -EFAULT; |
| 796 | else if (put_user(len, optlen)) |
| 797 | ret = -EFAULT; |
| 798 | else if (copy_to_user(optval, val, len)) |
| 799 | ret = -EFAULT; |
| 800 | else |
| 801 | ret = 0; |
| 802 | no_copy: |
| 803 | release_sock(&jsk->sk); |
| 804 | return ret; |
| 805 | } |
| 806 | |
| 807 | static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg, |
| 808 | size_t size, int flags) |
| 809 | { |
| 810 | struct sock *sk = sock->sk; |
| 811 | struct sk_buff *skb; |
| 812 | struct j1939_sk_buff_cb *skcb; |
| 813 | int ret = 0; |
| 814 | |
| 815 | if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE | MSG_CMSG_COMPAT)) |
| 816 | return -EINVAL; |
| 817 | |
| 818 | if (flags & MSG_ERRQUEUE) |
| 819 | return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939, |
| 820 | SCM_J1939_ERRQUEUE); |
| 821 | |
| 822 | skb = skb_recv_datagram(sk, flags, 0, &ret); |
| 823 | if (!skb) |
| 824 | return ret; |
| 825 | |
| 826 | if (size < skb->len) |
| 827 | msg->msg_flags |= MSG_TRUNC; |
| 828 | else |
| 829 | size = skb->len; |
| 830 | |
| 831 | ret = memcpy_to_msg(msg, skb->data, size); |
| 832 | if (ret < 0) { |
| 833 | skb_free_datagram(sk, skb); |
| 834 | return ret; |
| 835 | } |
| 836 | |
| 837 | skcb = j1939_skb_to_cb(skb); |
| 838 | if (j1939_address_is_valid(skcb->addr.da)) |
| 839 | put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_ADDR, |
| 840 | sizeof(skcb->addr.da), &skcb->addr.da); |
| 841 | |
| 842 | if (skcb->addr.dst_name) |
| 843 | put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_NAME, |
| 844 | sizeof(skcb->addr.dst_name), &skcb->addr.dst_name); |
| 845 | |
| 846 | put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_PRIO, |
| 847 | sizeof(skcb->priority), &skcb->priority); |
| 848 | |
| 849 | if (msg->msg_name) { |
| 850 | struct sockaddr_can *paddr = msg->msg_name; |
| 851 | |
| 852 | msg->msg_namelen = J1939_MIN_NAMELEN; |
| 853 | memset(msg->msg_name, 0, msg->msg_namelen); |
| 854 | paddr->can_family = AF_CAN; |
| 855 | paddr->can_ifindex = skb->skb_iif; |
| 856 | paddr->can_addr.j1939.name = skcb->addr.src_name; |
| 857 | paddr->can_addr.j1939.addr = skcb->addr.sa; |
| 858 | paddr->can_addr.j1939.pgn = skcb->addr.pgn; |
| 859 | } |
| 860 | |
| 861 | sock_recv_ts_and_drops(msg, sk, skb); |
| 862 | msg->msg_flags |= skcb->msg_flags; |
| 863 | skb_free_datagram(sk, skb); |
| 864 | |
| 865 | return size; |
| 866 | } |
| 867 | |
| 868 | static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev, |
| 869 | struct sock *sk, |
| 870 | struct msghdr *msg, size_t size, |
| 871 | int *errcode) |
| 872 | { |
| 873 | struct j1939_sock *jsk = j1939_sk(sk); |
| 874 | struct j1939_sk_buff_cb *skcb; |
| 875 | struct sk_buff *skb; |
| 876 | int ret; |
| 877 | |
| 878 | skb = sock_alloc_send_skb(sk, |
| 879 | size + |
| 880 | sizeof(struct can_frame) - |
| 881 | sizeof(((struct can_frame *)NULL)->data) + |
| 882 | sizeof(struct can_skb_priv), |
| 883 | msg->msg_flags & MSG_DONTWAIT, &ret); |
| 884 | if (!skb) |
| 885 | goto failure; |
| 886 | |
| 887 | can_skb_reserve(skb); |
| 888 | can_skb_prv(skb)->ifindex = ndev->ifindex; |
| 889 | can_skb_prv(skb)->skbcnt = 0; |
| 890 | skb_reserve(skb, offsetof(struct can_frame, data)); |
| 891 | |
| 892 | ret = memcpy_from_msg(skb_put(skb, size), msg, size); |
| 893 | if (ret < 0) |
| 894 | goto free_skb; |
| 895 | |
| 896 | skb->dev = ndev; |
| 897 | |
| 898 | skcb = j1939_skb_to_cb(skb); |
| 899 | memset(skcb, 0, sizeof(*skcb)); |
| 900 | skcb->addr = jsk->addr; |
| 901 | skcb->priority = j1939_prio(sk->sk_priority); |
| 902 | |
| 903 | if (msg->msg_name) { |
| 904 | struct sockaddr_can *addr = msg->msg_name; |
| 905 | |
| 906 | if (addr->can_addr.j1939.name || |
| 907 | addr->can_addr.j1939.addr != J1939_NO_ADDR) { |
| 908 | skcb->addr.dst_name = addr->can_addr.j1939.name; |
| 909 | skcb->addr.da = addr->can_addr.j1939.addr; |
| 910 | } |
| 911 | if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn)) |
| 912 | skcb->addr.pgn = addr->can_addr.j1939.pgn; |
| 913 | } |
| 914 | |
| 915 | *errcode = ret; |
| 916 | return skb; |
| 917 | |
| 918 | free_skb: |
| 919 | kfree_skb(skb); |
| 920 | failure: |
| 921 | *errcode = ret; |
| 922 | return NULL; |
| 923 | } |
| 924 | |
| 925 | static size_t j1939_sk_opt_stats_get_size(void) |
| 926 | { |
| 927 | return |
| 928 | nla_total_size(sizeof(u32)) + /* J1939_NLA_BYTES_ACKED */ |
| 929 | 0; |
| 930 | } |
| 931 | |
| 932 | static struct sk_buff * |
| 933 | j1939_sk_get_timestamping_opt_stats(struct j1939_session *session) |
| 934 | { |
| 935 | struct sk_buff *stats; |
| 936 | u32 size; |
| 937 | |
| 938 | stats = alloc_skb(j1939_sk_opt_stats_get_size(), GFP_ATOMIC); |
| 939 | if (!stats) |
| 940 | return NULL; |
| 941 | |
| 942 | if (session->skcb.addr.type == J1939_SIMPLE) |
| 943 | size = session->total_message_size; |
| 944 | else |
| 945 | size = min(session->pkt.tx_acked * 7, |
| 946 | session->total_message_size); |
| 947 | |
| 948 | nla_put_u32(stats, J1939_NLA_BYTES_ACKED, size); |
| 949 | |
| 950 | return stats; |
| 951 | } |
| 952 | |
| 953 | void j1939_sk_errqueue(struct j1939_session *session, |
| 954 | enum j1939_sk_errqueue_type type) |
| 955 | { |
| 956 | struct j1939_priv *priv = session->priv; |
| 957 | struct sock *sk = session->sk; |
| 958 | struct j1939_sock *jsk; |
| 959 | struct sock_exterr_skb *serr; |
| 960 | struct sk_buff *skb; |
| 961 | char *state = "UNK"; |
| 962 | int err; |
| 963 | |
| 964 | /* currently we have no sk for the RX session */ |
| 965 | if (!sk) |
| 966 | return; |
| 967 | |
| 968 | jsk = j1939_sk(sk); |
| 969 | |
| 970 | if (!(jsk->state & J1939_SOCK_ERRQUEUE)) |
| 971 | return; |
| 972 | |
| 973 | skb = j1939_sk_get_timestamping_opt_stats(session); |
| 974 | if (!skb) |
| 975 | return; |
| 976 | |
| 977 | skb->tstamp = ktime_get_real(); |
| 978 | |
| 979 | BUILD_BUG_ON(sizeof(struct sock_exterr_skb) > sizeof(skb->cb)); |
| 980 | |
| 981 | serr = SKB_EXT_ERR(skb); |
| 982 | memset(serr, 0, sizeof(*serr)); |
| 983 | switch (type) { |
| 984 | case J1939_ERRQUEUE_ACK: |
| 985 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)) { |
| 986 | kfree_skb(skb); |
| 987 | return; |
| 988 | } |
| 989 | |
| 990 | serr->ee.ee_errno = ENOMSG; |
| 991 | serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; |
| 992 | serr->ee.ee_info = SCM_TSTAMP_ACK; |
| 993 | state = "ACK"; |
| 994 | break; |
| 995 | case J1939_ERRQUEUE_SCHED: |
| 996 | if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)) { |
| 997 | kfree_skb(skb); |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | serr->ee.ee_errno = ENOMSG; |
| 1002 | serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; |
| 1003 | serr->ee.ee_info = SCM_TSTAMP_SCHED; |
| 1004 | state = "SCH"; |
| 1005 | break; |
| 1006 | case J1939_ERRQUEUE_ABORT: |
| 1007 | serr->ee.ee_errno = session->err; |
| 1008 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| 1009 | serr->ee.ee_info = J1939_EE_INFO_TX_ABORT; |
| 1010 | state = "ABT"; |
| 1011 | break; |
| 1012 | default: |
| 1013 | netdev_err(priv->ndev, "Unknown errqueue type %i\n", type); |
| 1014 | } |
| 1015 | |
| 1016 | serr->opt_stats = true; |
| 1017 | if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) |
| 1018 | serr->ee.ee_data = session->tskey; |
| 1019 | |
| 1020 | netdev_dbg(session->priv->ndev, "%s: 0x%p tskey: %i, state: %s\n", |
| 1021 | __func__, session, session->tskey, state); |
| 1022 | err = sock_queue_err_skb(sk, skb); |
| 1023 | |
| 1024 | if (err) |
| 1025 | kfree_skb(skb); |
| 1026 | }; |
| 1027 | |
| 1028 | void j1939_sk_send_loop_abort(struct sock *sk, int err) |
| 1029 | { |
| 1030 | struct j1939_sock *jsk = j1939_sk(sk); |
| 1031 | |
| 1032 | if (jsk->state & J1939_SOCK_ERRQUEUE) |
| 1033 | return; |
| 1034 | |
| 1035 | sk->sk_err = err; |
| 1036 | |
| 1037 | sk->sk_error_report(sk); |
| 1038 | } |
| 1039 | |
| 1040 | static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk, |
| 1041 | struct msghdr *msg, size_t size) |
| 1042 | |
| 1043 | { |
| 1044 | struct j1939_sock *jsk = j1939_sk(sk); |
| 1045 | struct j1939_session *session = j1939_sk_get_incomplete_session(jsk); |
| 1046 | struct sk_buff *skb; |
| 1047 | size_t segment_size, todo_size; |
| 1048 | int ret = 0; |
| 1049 | |
| 1050 | if (session && |
| 1051 | session->total_message_size != session->total_queued_size + size) { |
| 1052 | j1939_session_put(session); |
| 1053 | return -EIO; |
| 1054 | } |
| 1055 | |
| 1056 | todo_size = size; |
| 1057 | |
| 1058 | while (todo_size) { |
| 1059 | struct j1939_sk_buff_cb *skcb; |
| 1060 | |
| 1061 | segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE, |
| 1062 | todo_size); |
| 1063 | |
| 1064 | /* Allocate skb for one segment */ |
| 1065 | skb = j1939_sk_alloc_skb(priv->ndev, sk, msg, segment_size, |
| 1066 | &ret); |
| 1067 | if (ret) |
| 1068 | break; |
| 1069 | |
| 1070 | skcb = j1939_skb_to_cb(skb); |
| 1071 | |
| 1072 | if (!session) { |
| 1073 | /* at this point the size should be full size |
| 1074 | * of the session |
| 1075 | */ |
| 1076 | skcb->offset = 0; |
| 1077 | session = j1939_tp_send(priv, skb, size); |
| 1078 | if (IS_ERR(session)) { |
| 1079 | ret = PTR_ERR(session); |
| 1080 | goto kfree_skb; |
| 1081 | } |
| 1082 | if (j1939_sk_queue_session(session)) { |
| 1083 | /* try to activate session if we a |
| 1084 | * fist in the queue |
| 1085 | */ |
| 1086 | if (!j1939_session_activate(session)) { |
| 1087 | j1939_tp_schedule_txtimer(session, 0); |
| 1088 | } else { |
| 1089 | ret = -EBUSY; |
| 1090 | session->err = ret; |
| 1091 | j1939_sk_queue_drop_all(priv, jsk, |
| 1092 | EBUSY); |
| 1093 | break; |
| 1094 | } |
| 1095 | } |
| 1096 | } else { |
| 1097 | skcb->offset = session->total_queued_size; |
| 1098 | j1939_session_skb_queue(session, skb); |
| 1099 | } |
| 1100 | |
| 1101 | todo_size -= segment_size; |
| 1102 | session->total_queued_size += segment_size; |
| 1103 | } |
| 1104 | |
| 1105 | switch (ret) { |
| 1106 | case 0: /* OK */ |
| 1107 | if (todo_size) |
| 1108 | netdev_warn(priv->ndev, |
| 1109 | "no error found and not completely queued?! %zu\n", |
| 1110 | todo_size); |
| 1111 | ret = size; |
| 1112 | break; |
| 1113 | case -ERESTARTSYS: |
| 1114 | ret = -EINTR; |
| 1115 | /* fall through */ |
| 1116 | case -EAGAIN: /* OK */ |
| 1117 | if (todo_size != size) |
| 1118 | ret = size - todo_size; |
| 1119 | break; |
| 1120 | default: /* ERROR */ |
| 1121 | break; |
| 1122 | } |
| 1123 | |
| 1124 | if (session) |
| 1125 | j1939_session_put(session); |
| 1126 | |
| 1127 | return ret; |
| 1128 | |
| 1129 | kfree_skb: |
| 1130 | kfree_skb(skb); |
| 1131 | return ret; |
| 1132 | } |
| 1133 | |
| 1134 | static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg, |
| 1135 | size_t size) |
| 1136 | { |
| 1137 | struct sock *sk = sock->sk; |
| 1138 | struct j1939_sock *jsk = j1939_sk(sk); |
| 1139 | struct j1939_priv *priv; |
| 1140 | int ifindex; |
| 1141 | int ret; |
| 1142 | |
| 1143 | lock_sock(sock->sk); |
| 1144 | /* various socket state tests */ |
| 1145 | if (!(jsk->state & J1939_SOCK_BOUND)) { |
| 1146 | ret = -EBADFD; |
| 1147 | goto sendmsg_done; |
| 1148 | } |
| 1149 | |
| 1150 | priv = jsk->priv; |
| 1151 | ifindex = jsk->ifindex; |
| 1152 | |
| 1153 | if (!jsk->addr.src_name && jsk->addr.sa == J1939_NO_ADDR) { |
| 1154 | /* no source address assigned yet */ |
| 1155 | ret = -EBADFD; |
| 1156 | goto sendmsg_done; |
| 1157 | } |
| 1158 | |
| 1159 | /* deal with provided destination address info */ |
| 1160 | if (msg->msg_name) { |
| 1161 | struct sockaddr_can *addr = msg->msg_name; |
| 1162 | |
| 1163 | if (msg->msg_namelen < J1939_MIN_NAMELEN) { |
| 1164 | ret = -EINVAL; |
| 1165 | goto sendmsg_done; |
| 1166 | } |
| 1167 | |
| 1168 | if (addr->can_family != AF_CAN) { |
| 1169 | ret = -EINVAL; |
| 1170 | goto sendmsg_done; |
| 1171 | } |
| 1172 | |
| 1173 | if (addr->can_ifindex && addr->can_ifindex != ifindex) { |
| 1174 | ret = -EBADFD; |
| 1175 | goto sendmsg_done; |
| 1176 | } |
| 1177 | |
| 1178 | if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) && |
| 1179 | !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) { |
| 1180 | ret = -EINVAL; |
| 1181 | goto sendmsg_done; |
| 1182 | } |
| 1183 | |
| 1184 | if (!addr->can_addr.j1939.name && |
| 1185 | addr->can_addr.j1939.addr == J1939_NO_ADDR && |
| 1186 | !sock_flag(sk, SOCK_BROADCAST)) { |
| 1187 | /* broadcast, but SO_BROADCAST not set */ |
| 1188 | ret = -EACCES; |
| 1189 | goto sendmsg_done; |
| 1190 | } |
| 1191 | } else { |
| 1192 | if (!jsk->addr.dst_name && jsk->addr.da == J1939_NO_ADDR && |
| 1193 | !sock_flag(sk, SOCK_BROADCAST)) { |
| 1194 | /* broadcast, but SO_BROADCAST not set */ |
| 1195 | ret = -EACCES; |
| 1196 | goto sendmsg_done; |
| 1197 | } |
| 1198 | } |
| 1199 | |
| 1200 | ret = j1939_sk_send_loop(priv, sk, msg, size); |
| 1201 | |
| 1202 | sendmsg_done: |
| 1203 | release_sock(sock->sk); |
| 1204 | |
| 1205 | return ret; |
| 1206 | } |
| 1207 | |
| 1208 | void j1939_sk_netdev_event_netdown(struct j1939_priv *priv) |
| 1209 | { |
| 1210 | struct j1939_sock *jsk; |
| 1211 | int error_code = ENETDOWN; |
| 1212 | |
| 1213 | spin_lock_bh(&priv->j1939_socks_lock); |
| 1214 | list_for_each_entry(jsk, &priv->j1939_socks, list) { |
| 1215 | jsk->sk.sk_err = error_code; |
| 1216 | if (!sock_flag(&jsk->sk, SOCK_DEAD)) |
| 1217 | jsk->sk.sk_error_report(&jsk->sk); |
| 1218 | |
| 1219 | j1939_sk_queue_drop_all(priv, jsk, error_code); |
| 1220 | } |
| 1221 | spin_unlock_bh(&priv->j1939_socks_lock); |
| 1222 | } |
| 1223 | |
| 1224 | static int j1939_sk_no_ioctlcmd(struct socket *sock, unsigned int cmd, |
| 1225 | unsigned long arg) |
| 1226 | { |
| 1227 | /* no ioctls for socket layer -> hand it down to NIC layer */ |
| 1228 | return -ENOIOCTLCMD; |
| 1229 | } |
| 1230 | |
| 1231 | static const struct proto_ops j1939_ops = { |
| 1232 | .family = PF_CAN, |
| 1233 | .release = j1939_sk_release, |
| 1234 | .bind = j1939_sk_bind, |
| 1235 | .connect = j1939_sk_connect, |
| 1236 | .socketpair = sock_no_socketpair, |
| 1237 | .accept = sock_no_accept, |
| 1238 | .getname = j1939_sk_getname, |
| 1239 | .poll = datagram_poll, |
| 1240 | .ioctl = j1939_sk_no_ioctlcmd, |
| 1241 | .listen = sock_no_listen, |
| 1242 | .shutdown = sock_no_shutdown, |
| 1243 | .setsockopt = j1939_sk_setsockopt, |
| 1244 | .getsockopt = j1939_sk_getsockopt, |
| 1245 | .sendmsg = j1939_sk_sendmsg, |
| 1246 | .recvmsg = j1939_sk_recvmsg, |
| 1247 | .mmap = sock_no_mmap, |
| 1248 | .sendpage = sock_no_sendpage, |
| 1249 | }; |
| 1250 | |
| 1251 | static struct proto j1939_proto __read_mostly = { |
| 1252 | .name = "CAN_J1939", |
| 1253 | .owner = THIS_MODULE, |
| 1254 | .obj_size = sizeof(struct j1939_sock), |
| 1255 | .init = j1939_sk_init, |
| 1256 | }; |
| 1257 | |
| 1258 | const struct can_proto j1939_can_proto = { |
| 1259 | .type = SOCK_DGRAM, |
| 1260 | .protocol = CAN_J1939, |
| 1261 | .ops = &j1939_ops, |
| 1262 | .prot = &j1939_proto, |
| 1263 | }; |