1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2010-2011 EIA Electronics, 3 // Kurt Van Dijck <kurt.van.dijck@eia.be> 4 // Copyright (c) 2018 Protonic, 5 // Robin van der Gracht <robin@protonic.nl> 6 // Copyright (c) 2017-2019 Pengutronix, 7 // Marc Kleine-Budde <kernel@pengutronix.de> 8 // Copyright (c) 2017-2019 Pengutronix, 9 // Oleksij Rempel <kernel@pengutronix.de> 10 11 #include <linux/can/skb.h> 12 13 #include "j1939-priv.h" 14 15 #define J1939_XTP_TX_RETRY_LIMIT 100 16 17 #define J1939_ETP_PGN_CTL 0xc800 18 #define J1939_ETP_PGN_DAT 0xc700 19 #define J1939_TP_PGN_CTL 0xec00 20 #define J1939_TP_PGN_DAT 0xeb00 21 22 #define J1939_TP_CMD_RTS 0x10 23 #define J1939_TP_CMD_CTS 0x11 24 #define J1939_TP_CMD_EOMA 0x13 25 #define J1939_TP_CMD_BAM 0x20 26 #define J1939_TP_CMD_ABORT 0xff 27 28 #define J1939_ETP_CMD_RTS 0x14 29 #define J1939_ETP_CMD_CTS 0x15 30 #define J1939_ETP_CMD_DPO 0x16 31 #define J1939_ETP_CMD_EOMA 0x17 32 #define J1939_ETP_CMD_ABORT 0xff 33 34 enum j1939_xtp_abort { 35 J1939_XTP_NO_ABORT = 0, 36 J1939_XTP_ABORT_BUSY = 1, 37 /* Already in one or more connection managed sessions and 38 * cannot support another. 39 * 40 * EALREADY: 41 * Operation already in progress 42 */ 43 44 J1939_XTP_ABORT_RESOURCE = 2, 45 /* System resources were needed for another task so this 46 * connection managed session was terminated. 47 * 48 * EMSGSIZE: 49 * The socket type requires that message be sent atomically, 50 * and the size of the message to be sent made this 51 * impossible. 52 */ 53 54 J1939_XTP_ABORT_TIMEOUT = 3, 55 /* A timeout occurred and this is the connection abort to 56 * close the session. 57 * 58 * EHOSTUNREACH: 59 * The destination host cannot be reached (probably because 60 * the host is down or a remote router cannot reach it). 61 */ 62 63 J1939_XTP_ABORT_GENERIC = 4, 64 /* CTS messages received when data transfer is in progress 65 * 66 * EBADMSG: 67 * Not a data message 68 */ 69 70 J1939_XTP_ABORT_FAULT = 5, 71 /* Maximal retransmit request limit reached 72 * 73 * ENOTRECOVERABLE: 74 * State not recoverable 75 */ 76 77 J1939_XTP_ABORT_UNEXPECTED_DATA = 6, 78 /* Unexpected data transfer packet 79 * 80 * ENOTCONN: 81 * Transport endpoint is not connected 82 */ 83 84 J1939_XTP_ABORT_BAD_SEQ = 7, 85 /* Bad sequence number (and software is not able to recover) 86 * 87 * EILSEQ: 88 * Illegal byte sequence 89 */ 90 91 J1939_XTP_ABORT_DUP_SEQ = 8, 92 /* Duplicate sequence number (and software is not able to 93 * recover) 94 */ 95 96 J1939_XTP_ABORT_EDPO_UNEXPECTED = 9, 97 /* Unexpected EDPO packet (ETP) or Message size > 1785 bytes 98 * (TP) 99 */ 100 101 J1939_XTP_ABORT_BAD_EDPO_PGN = 10, 102 /* Unexpected EDPO PGN (PGN in EDPO is bad) */ 103 104 J1939_XTP_ABORT_EDPO_OUTOF_CTS = 11, 105 /* EDPO number of packets is greater than CTS */ 106 107 J1939_XTP_ABORT_BAD_EDPO_OFFSET = 12, 108 /* Bad EDPO offset */ 109 110 J1939_XTP_ABORT_OTHER_DEPRECATED = 13, 111 /* Deprecated. Use 250 instead (Any other reason) */ 112 113 J1939_XTP_ABORT_ECTS_UNXPECTED_PGN = 14, 114 /* Unexpected ECTS PGN (PGN in ECTS is bad) */ 115 116 J1939_XTP_ABORT_ECTS_TOO_BIG = 15, 117 /* ECTS requested packets exceeds message size */ 118 119 J1939_XTP_ABORT_OTHER = 250, 120 /* Any other reason (if a Connection Abort reason is 121 * identified that is not listed in the table use code 250) 122 */ 123 }; 124 125 static unsigned int j1939_tp_block = 255; 126 static unsigned int j1939_tp_packet_delay; 127 static unsigned int j1939_tp_padding = 1; 128 129 /* helpers */ 130 static const char *j1939_xtp_abort_to_str(enum j1939_xtp_abort abort) 131 { 132 switch (abort) { 133 case J1939_XTP_ABORT_BUSY: 134 return "Already in one or more connection managed sessions and cannot support another."; 135 case J1939_XTP_ABORT_RESOURCE: 136 return "System resources were needed for another task so this connection managed session was terminated."; 137 case J1939_XTP_ABORT_TIMEOUT: 138 return "A timeout occurred and this is the connection abort to close the session."; 139 case J1939_XTP_ABORT_GENERIC: 140 return "CTS messages received when data transfer is in progress"; 141 case J1939_XTP_ABORT_FAULT: 142 return "Maximal retransmit request limit reached"; 143 case J1939_XTP_ABORT_UNEXPECTED_DATA: 144 return "Unexpected data transfer packet"; 145 case J1939_XTP_ABORT_BAD_SEQ: 146 return "Bad sequence number (and software is not able to recover)"; 147 case J1939_XTP_ABORT_DUP_SEQ: 148 return "Duplicate sequence number (and software is not able to recover)"; 149 case J1939_XTP_ABORT_EDPO_UNEXPECTED: 150 return "Unexpected EDPO packet (ETP) or Message size > 1785 bytes (TP)"; 151 case J1939_XTP_ABORT_BAD_EDPO_PGN: 152 return "Unexpected EDPO PGN (PGN in EDPO is bad)"; 153 case J1939_XTP_ABORT_EDPO_OUTOF_CTS: 154 return "EDPO number of packets is greater than CTS"; 155 case J1939_XTP_ABORT_BAD_EDPO_OFFSET: 156 return "Bad EDPO offset"; 157 case J1939_XTP_ABORT_OTHER_DEPRECATED: 158 return "Deprecated. Use 250 instead (Any other reason)"; 159 case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN: 160 return "Unexpected ECTS PGN (PGN in ECTS is bad)"; 161 case J1939_XTP_ABORT_ECTS_TOO_BIG: 162 return "ECTS requested packets exceeds message size"; 163 case J1939_XTP_ABORT_OTHER: 164 return "Any other reason (if a Connection Abort reason is identified that is not listed in the table use code 250)"; 165 default: 166 return "<unknown>"; 167 } 168 } 169 170 static int j1939_xtp_abort_to_errno(struct j1939_priv *priv, 171 enum j1939_xtp_abort abort) 172 { 173 int err; 174 175 switch (abort) { 176 case J1939_XTP_NO_ABORT: 177 WARN_ON_ONCE(abort == J1939_XTP_NO_ABORT); 178 err = 0; 179 break; 180 case J1939_XTP_ABORT_BUSY: 181 err = EALREADY; 182 break; 183 case J1939_XTP_ABORT_RESOURCE: 184 err = EMSGSIZE; 185 break; 186 case J1939_XTP_ABORT_TIMEOUT: 187 err = EHOSTUNREACH; 188 break; 189 case J1939_XTP_ABORT_GENERIC: 190 err = EBADMSG; 191 break; 192 case J1939_XTP_ABORT_FAULT: 193 err = ENOTRECOVERABLE; 194 break; 195 case J1939_XTP_ABORT_UNEXPECTED_DATA: 196 err = ENOTCONN; 197 break; 198 case J1939_XTP_ABORT_BAD_SEQ: 199 err = EILSEQ; 200 break; 201 case J1939_XTP_ABORT_DUP_SEQ: 202 err = EPROTO; 203 break; 204 case J1939_XTP_ABORT_EDPO_UNEXPECTED: 205 err = EPROTO; 206 break; 207 case J1939_XTP_ABORT_BAD_EDPO_PGN: 208 err = EPROTO; 209 break; 210 case J1939_XTP_ABORT_EDPO_OUTOF_CTS: 211 err = EPROTO; 212 break; 213 case J1939_XTP_ABORT_BAD_EDPO_OFFSET: 214 err = EPROTO; 215 break; 216 case J1939_XTP_ABORT_OTHER_DEPRECATED: 217 err = EPROTO; 218 break; 219 case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN: 220 err = EPROTO; 221 break; 222 case J1939_XTP_ABORT_ECTS_TOO_BIG: 223 err = EPROTO; 224 break; 225 case J1939_XTP_ABORT_OTHER: 226 err = EPROTO; 227 break; 228 default: 229 netdev_warn(priv->ndev, "Unknown abort code %i", abort); 230 err = EPROTO; 231 } 232 233 return err; 234 } 235 236 static inline void j1939_session_list_lock(struct j1939_priv *priv) 237 { 238 spin_lock_bh(&priv->active_session_list_lock); 239 } 240 241 static inline void j1939_session_list_unlock(struct j1939_priv *priv) 242 { 243 spin_unlock_bh(&priv->active_session_list_lock); 244 } 245 246 void j1939_session_get(struct j1939_session *session) 247 { 248 kref_get(&session->kref); 249 } 250 251 /* session completion functions */ 252 static void __j1939_session_drop(struct j1939_session *session) 253 { 254 if (!session->transmission) 255 return; 256 257 j1939_sock_pending_del(session->sk); 258 } 259 260 static void j1939_session_destroy(struct j1939_session *session) 261 { 262 if (session->err) 263 j1939_sk_errqueue(session, J1939_ERRQUEUE_ABORT); 264 else 265 j1939_sk_errqueue(session, J1939_ERRQUEUE_ACK); 266 267 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 268 269 skb_queue_purge(&session->skb_queue); 270 __j1939_session_drop(session); 271 j1939_priv_put(session->priv); 272 kfree(session); 273 } 274 275 static void __j1939_session_release(struct kref *kref) 276 { 277 struct j1939_session *session = container_of(kref, struct j1939_session, 278 kref); 279 280 j1939_session_destroy(session); 281 } 282 283 void j1939_session_put(struct j1939_session *session) 284 { 285 kref_put(&session->kref, __j1939_session_release); 286 } 287 288 static void j1939_session_txtimer_cancel(struct j1939_session *session) 289 { 290 if (hrtimer_cancel(&session->txtimer)) 291 j1939_session_put(session); 292 } 293 294 static void j1939_session_rxtimer_cancel(struct j1939_session *session) 295 { 296 if (hrtimer_cancel(&session->rxtimer)) 297 j1939_session_put(session); 298 } 299 300 void j1939_session_timers_cancel(struct j1939_session *session) 301 { 302 j1939_session_txtimer_cancel(session); 303 j1939_session_rxtimer_cancel(session); 304 } 305 306 static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb) 307 { 308 return (!skcb->addr.dst_name && (skcb->addr.da == 0xff)); 309 } 310 311 static void j1939_session_skb_drop_old(struct j1939_session *session) 312 { 313 struct sk_buff *do_skb; 314 struct j1939_sk_buff_cb *do_skcb; 315 unsigned int offset_start; 316 unsigned long flags; 317 318 if (skb_queue_len(&session->skb_queue) < 2) 319 return; 320 321 offset_start = session->pkt.tx_acked * 7; 322 323 spin_lock_irqsave(&session->skb_queue.lock, flags); 324 do_skb = skb_peek(&session->skb_queue); 325 do_skcb = j1939_skb_to_cb(do_skb); 326 327 if ((do_skcb->offset + do_skb->len) < offset_start) { 328 __skb_unlink(do_skb, &session->skb_queue); 329 kfree_skb(do_skb); 330 } 331 spin_unlock_irqrestore(&session->skb_queue.lock, flags); 332 } 333 334 void j1939_session_skb_queue(struct j1939_session *session, 335 struct sk_buff *skb) 336 { 337 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 338 struct j1939_priv *priv = session->priv; 339 340 j1939_ac_fixup(priv, skb); 341 342 if (j1939_address_is_unicast(skcb->addr.da) && 343 priv->ents[skcb->addr.da].nusers) 344 skcb->flags |= J1939_ECU_LOCAL_DST; 345 346 skcb->flags |= J1939_ECU_LOCAL_SRC; 347 348 skb_queue_tail(&session->skb_queue, skb); 349 } 350 351 static struct sk_buff *j1939_session_skb_find(struct j1939_session *session) 352 { 353 struct j1939_priv *priv = session->priv; 354 struct sk_buff *skb = NULL; 355 struct sk_buff *do_skb; 356 struct j1939_sk_buff_cb *do_skcb; 357 unsigned int offset_start; 358 unsigned long flags; 359 360 offset_start = session->pkt.dpo * 7; 361 362 spin_lock_irqsave(&session->skb_queue.lock, flags); 363 skb_queue_walk(&session->skb_queue, do_skb) { 364 do_skcb = j1939_skb_to_cb(do_skb); 365 366 if (offset_start >= do_skcb->offset && 367 offset_start < (do_skcb->offset + do_skb->len)) { 368 skb = do_skb; 369 } 370 } 371 spin_unlock_irqrestore(&session->skb_queue.lock, flags); 372 373 if (!skb) 374 netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n", 375 __func__, session, offset_start, 376 skb_queue_len(&session->skb_queue)); 377 378 return skb; 379 } 380 381 /* see if we are receiver 382 * returns 0 for broadcasts, although we will receive them 383 */ 384 static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb) 385 { 386 return skcb->flags & J1939_ECU_LOCAL_DST; 387 } 388 389 /* see if we are sender */ 390 static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb) 391 { 392 return skcb->flags & J1939_ECU_LOCAL_SRC; 393 } 394 395 /* see if we are involved as either receiver or transmitter */ 396 static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap) 397 { 398 if (swap) 399 return j1939_tp_im_receiver(skcb); 400 else 401 return j1939_tp_im_transmitter(skcb); 402 } 403 404 static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb) 405 { 406 return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST); 407 } 408 409 /* extract pgn from flow-ctl message */ 410 static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat) 411 { 412 pgn_t pgn; 413 414 pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0); 415 if (j1939_pgn_is_pdu1(pgn)) 416 pgn &= 0xffff00; 417 return pgn; 418 } 419 420 static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat) 421 { 422 return (dat[2] << 8) + (dat[1] << 0); 423 } 424 425 static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat) 426 { 427 return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0); 428 } 429 430 static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat) 431 { 432 return (dat[4] << 24) | (dat[3] << 16) | 433 (dat[2] << 8) | (dat[1] << 0); 434 } 435 436 /* find existing session: 437 * reverse: swap cb's src & dst 438 * there is no problem with matching broadcasts, since 439 * broadcasts (no dst, no da) would never call this 440 * with reverse == true 441 */ 442 static bool j1939_session_match(struct j1939_addr *se_addr, 443 struct j1939_addr *sk_addr, bool reverse) 444 { 445 if (se_addr->type != sk_addr->type) 446 return false; 447 448 if (reverse) { 449 if (se_addr->src_name) { 450 if (se_addr->src_name != sk_addr->dst_name) 451 return false; 452 } else if (se_addr->sa != sk_addr->da) { 453 return false; 454 } 455 456 if (se_addr->dst_name) { 457 if (se_addr->dst_name != sk_addr->src_name) 458 return false; 459 } else if (se_addr->da != sk_addr->sa) { 460 return false; 461 } 462 } else { 463 if (se_addr->src_name) { 464 if (se_addr->src_name != sk_addr->src_name) 465 return false; 466 } else if (se_addr->sa != sk_addr->sa) { 467 return false; 468 } 469 470 if (se_addr->dst_name) { 471 if (se_addr->dst_name != sk_addr->dst_name) 472 return false; 473 } else if (se_addr->da != sk_addr->da) { 474 return false; 475 } 476 } 477 478 return true; 479 } 480 481 static struct 482 j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv, 483 struct list_head *root, 484 struct j1939_addr *addr, 485 bool reverse, bool transmitter) 486 { 487 struct j1939_session *session; 488 489 lockdep_assert_held(&priv->active_session_list_lock); 490 491 list_for_each_entry(session, root, active_session_list_entry) { 492 j1939_session_get(session); 493 if (j1939_session_match(&session->skcb.addr, addr, reverse) && 494 session->transmission == transmitter) 495 return session; 496 j1939_session_put(session); 497 } 498 499 return NULL; 500 } 501 502 static struct 503 j1939_session *j1939_session_get_simple(struct j1939_priv *priv, 504 struct sk_buff *skb) 505 { 506 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 507 struct j1939_session *session; 508 509 lockdep_assert_held(&priv->active_session_list_lock); 510 511 list_for_each_entry(session, &priv->active_session_list, 512 active_session_list_entry) { 513 j1939_session_get(session); 514 if (session->skcb.addr.type == J1939_SIMPLE && 515 session->tskey == skcb->tskey && session->sk == skb->sk) 516 return session; 517 j1939_session_put(session); 518 } 519 520 return NULL; 521 } 522 523 static struct 524 j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv, 525 struct j1939_addr *addr, 526 bool reverse, bool transmitter) 527 { 528 struct j1939_session *session; 529 530 j1939_session_list_lock(priv); 531 session = j1939_session_get_by_addr_locked(priv, 532 &priv->active_session_list, 533 addr, reverse, transmitter); 534 j1939_session_list_unlock(priv); 535 536 return session; 537 } 538 539 static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb) 540 { 541 u8 tmp = 0; 542 543 swap(skcb->addr.dst_name, skcb->addr.src_name); 544 swap(skcb->addr.da, skcb->addr.sa); 545 546 /* swap SRC and DST flags, leave other untouched */ 547 if (skcb->flags & J1939_ECU_LOCAL_SRC) 548 tmp |= J1939_ECU_LOCAL_DST; 549 if (skcb->flags & J1939_ECU_LOCAL_DST) 550 tmp |= J1939_ECU_LOCAL_SRC; 551 skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST); 552 skcb->flags |= tmp; 553 } 554 555 static struct 556 sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv, 557 const struct j1939_sk_buff_cb *re_skcb, 558 bool ctl, 559 bool swap_src_dst) 560 { 561 struct sk_buff *skb; 562 struct j1939_sk_buff_cb *skcb; 563 564 skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv), 565 GFP_ATOMIC); 566 if (unlikely(!skb)) 567 return ERR_PTR(-ENOMEM); 568 569 skb->dev = priv->ndev; 570 can_skb_reserve(skb); 571 can_skb_prv(skb)->ifindex = priv->ndev->ifindex; 572 /* reserve CAN header */ 573 skb_reserve(skb, offsetof(struct can_frame, data)); 574 575 memcpy(skb->cb, re_skcb, sizeof(skb->cb)); 576 skcb = j1939_skb_to_cb(skb); 577 if (swap_src_dst) 578 j1939_skbcb_swap(skcb); 579 580 if (ctl) { 581 if (skcb->addr.type == J1939_ETP) 582 skcb->addr.pgn = J1939_ETP_PGN_CTL; 583 else 584 skcb->addr.pgn = J1939_TP_PGN_CTL; 585 } else { 586 if (skcb->addr.type == J1939_ETP) 587 skcb->addr.pgn = J1939_ETP_PGN_DAT; 588 else 589 skcb->addr.pgn = J1939_TP_PGN_DAT; 590 } 591 592 return skb; 593 } 594 595 /* TP transmit packet functions */ 596 static int j1939_tp_tx_dat(struct j1939_session *session, 597 const u8 *dat, int len) 598 { 599 struct j1939_priv *priv = session->priv; 600 struct sk_buff *skb; 601 602 skb = j1939_tp_tx_dat_new(priv, &session->skcb, 603 false, false); 604 if (IS_ERR(skb)) 605 return PTR_ERR(skb); 606 607 skb_put_data(skb, dat, len); 608 if (j1939_tp_padding && len < 8) 609 memset(skb_put(skb, 8 - len), 0xff, 8 - len); 610 611 return j1939_send_one(priv, skb); 612 } 613 614 static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv, 615 const struct j1939_sk_buff_cb *re_skcb, 616 bool swap_src_dst, pgn_t pgn, const u8 *dat) 617 { 618 struct sk_buff *skb; 619 u8 *skdat; 620 621 if (!j1939_tp_im_involved(re_skcb, swap_src_dst)) 622 return 0; 623 624 skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst); 625 if (IS_ERR(skb)) 626 return PTR_ERR(skb); 627 628 skdat = skb_put(skb, 8); 629 memcpy(skdat, dat, 5); 630 skdat[5] = (pgn >> 0); 631 skdat[6] = (pgn >> 8); 632 skdat[7] = (pgn >> 16); 633 634 return j1939_send_one(priv, skb); 635 } 636 637 static inline int j1939_tp_tx_ctl(struct j1939_session *session, 638 bool swap_src_dst, const u8 *dat) 639 { 640 struct j1939_priv *priv = session->priv; 641 642 return j1939_xtp_do_tx_ctl(priv, &session->skcb, 643 swap_src_dst, 644 session->skcb.addr.pgn, dat); 645 } 646 647 static int j1939_xtp_tx_abort(struct j1939_priv *priv, 648 const struct j1939_sk_buff_cb *re_skcb, 649 bool swap_src_dst, 650 enum j1939_xtp_abort err, 651 pgn_t pgn) 652 { 653 u8 dat[5]; 654 655 if (!j1939_tp_im_involved(re_skcb, swap_src_dst)) 656 return 0; 657 658 memset(dat, 0xff, sizeof(dat)); 659 dat[0] = J1939_TP_CMD_ABORT; 660 dat[1] = err; 661 return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat); 662 } 663 664 void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec) 665 { 666 j1939_session_get(session); 667 hrtimer_start(&session->txtimer, ms_to_ktime(msec), 668 HRTIMER_MODE_REL_SOFT); 669 } 670 671 static inline void j1939_tp_set_rxtimeout(struct j1939_session *session, 672 int msec) 673 { 674 j1939_session_rxtimer_cancel(session); 675 j1939_session_get(session); 676 hrtimer_start(&session->rxtimer, ms_to_ktime(msec), 677 HRTIMER_MODE_REL_SOFT); 678 } 679 680 static int j1939_session_tx_rts(struct j1939_session *session) 681 { 682 u8 dat[8]; 683 int ret; 684 685 memset(dat, 0xff, sizeof(dat)); 686 687 dat[1] = (session->total_message_size >> 0); 688 dat[2] = (session->total_message_size >> 8); 689 dat[3] = session->pkt.total; 690 691 if (session->skcb.addr.type == J1939_ETP) { 692 dat[0] = J1939_ETP_CMD_RTS; 693 dat[1] = (session->total_message_size >> 0); 694 dat[2] = (session->total_message_size >> 8); 695 dat[3] = (session->total_message_size >> 16); 696 dat[4] = (session->total_message_size >> 24); 697 } else if (j1939_cb_is_broadcast(&session->skcb)) { 698 dat[0] = J1939_TP_CMD_BAM; 699 /* fake cts for broadcast */ 700 session->pkt.tx = 0; 701 } else { 702 dat[0] = J1939_TP_CMD_RTS; 703 dat[4] = dat[3]; 704 } 705 706 if (dat[0] == session->last_txcmd) 707 /* done already */ 708 return 0; 709 710 ret = j1939_tp_tx_ctl(session, false, dat); 711 if (ret < 0) 712 return ret; 713 714 session->last_txcmd = dat[0]; 715 if (dat[0] == J1939_TP_CMD_BAM) 716 j1939_tp_schedule_txtimer(session, 50); 717 718 j1939_tp_set_rxtimeout(session, 1250); 719 720 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 721 722 return 0; 723 } 724 725 static int j1939_session_tx_dpo(struct j1939_session *session) 726 { 727 unsigned int pkt; 728 u8 dat[8]; 729 int ret; 730 731 memset(dat, 0xff, sizeof(dat)); 732 733 dat[0] = J1939_ETP_CMD_DPO; 734 session->pkt.dpo = session->pkt.tx_acked; 735 pkt = session->pkt.dpo; 736 dat[1] = session->pkt.last - session->pkt.tx_acked; 737 dat[2] = (pkt >> 0); 738 dat[3] = (pkt >> 8); 739 dat[4] = (pkt >> 16); 740 741 ret = j1939_tp_tx_ctl(session, false, dat); 742 if (ret < 0) 743 return ret; 744 745 session->last_txcmd = dat[0]; 746 j1939_tp_set_rxtimeout(session, 1250); 747 session->pkt.tx = session->pkt.tx_acked; 748 749 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 750 751 return 0; 752 } 753 754 static int j1939_session_tx_dat(struct j1939_session *session) 755 { 756 struct j1939_priv *priv = session->priv; 757 struct j1939_sk_buff_cb *skcb; 758 int offset, pkt_done, pkt_end; 759 unsigned int len, pdelay; 760 struct sk_buff *se_skb; 761 const u8 *tpdat; 762 int ret = 0; 763 u8 dat[8]; 764 765 se_skb = j1939_session_skb_find(session); 766 if (!se_skb) 767 return -ENOBUFS; 768 769 skcb = j1939_skb_to_cb(se_skb); 770 tpdat = se_skb->data; 771 ret = 0; 772 pkt_done = 0; 773 if (session->skcb.addr.type != J1939_ETP && 774 j1939_cb_is_broadcast(&session->skcb)) 775 pkt_end = session->pkt.total; 776 else 777 pkt_end = session->pkt.last; 778 779 while (session->pkt.tx < pkt_end) { 780 dat[0] = session->pkt.tx - session->pkt.dpo + 1; 781 offset = (session->pkt.tx * 7) - skcb->offset; 782 len = se_skb->len - offset; 783 if (len > 7) 784 len = 7; 785 786 memcpy(&dat[1], &tpdat[offset], len); 787 ret = j1939_tp_tx_dat(session, dat, len + 1); 788 if (ret < 0) { 789 /* ENOBUS == CAN interface TX queue is full */ 790 if (ret != -ENOBUFS) 791 netdev_alert(priv->ndev, 792 "%s: 0x%p: queue data error: %i\n", 793 __func__, session, ret); 794 break; 795 } 796 797 session->last_txcmd = 0xff; 798 pkt_done++; 799 session->pkt.tx++; 800 pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 : 801 j1939_tp_packet_delay; 802 803 if (session->pkt.tx < session->pkt.total && pdelay) { 804 j1939_tp_schedule_txtimer(session, pdelay); 805 break; 806 } 807 } 808 809 if (pkt_done) 810 j1939_tp_set_rxtimeout(session, 250); 811 812 return ret; 813 } 814 815 static int j1939_xtp_txnext_transmiter(struct j1939_session *session) 816 { 817 struct j1939_priv *priv = session->priv; 818 int ret = 0; 819 820 if (!j1939_tp_im_transmitter(&session->skcb)) { 821 netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n", 822 __func__, session); 823 return -EINVAL; 824 } 825 826 switch (session->last_cmd) { 827 case 0: 828 ret = j1939_session_tx_rts(session); 829 break; 830 831 case J1939_ETP_CMD_CTS: 832 if (session->last_txcmd != J1939_ETP_CMD_DPO) { 833 ret = j1939_session_tx_dpo(session); 834 if (ret) 835 return ret; 836 } 837 838 /* fall through */ 839 case J1939_TP_CMD_CTS: 840 case 0xff: /* did some data */ 841 case J1939_ETP_CMD_DPO: 842 case J1939_TP_CMD_BAM: 843 ret = j1939_session_tx_dat(session); 844 845 break; 846 default: 847 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n", 848 __func__, session, session->last_cmd); 849 } 850 851 return ret; 852 } 853 854 static int j1939_session_tx_cts(struct j1939_session *session) 855 { 856 struct j1939_priv *priv = session->priv; 857 unsigned int pkt, len; 858 int ret; 859 u8 dat[8]; 860 861 if (!j1939_sk_recv_match(priv, &session->skcb)) 862 return -ENOENT; 863 864 len = session->pkt.total - session->pkt.rx; 865 len = min3(len, session->pkt.block, j1939_tp_block ?: 255); 866 memset(dat, 0xff, sizeof(dat)); 867 868 if (session->skcb.addr.type == J1939_ETP) { 869 pkt = session->pkt.rx + 1; 870 dat[0] = J1939_ETP_CMD_CTS; 871 dat[1] = len; 872 dat[2] = (pkt >> 0); 873 dat[3] = (pkt >> 8); 874 dat[4] = (pkt >> 16); 875 } else { 876 dat[0] = J1939_TP_CMD_CTS; 877 dat[1] = len; 878 dat[2] = session->pkt.rx + 1; 879 } 880 881 if (dat[0] == session->last_txcmd) 882 /* done already */ 883 return 0; 884 885 ret = j1939_tp_tx_ctl(session, true, dat); 886 if (ret < 0) 887 return ret; 888 889 if (len) 890 /* only mark cts done when len is set */ 891 session->last_txcmd = dat[0]; 892 j1939_tp_set_rxtimeout(session, 1250); 893 894 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 895 896 return 0; 897 } 898 899 static int j1939_session_tx_eoma(struct j1939_session *session) 900 { 901 struct j1939_priv *priv = session->priv; 902 u8 dat[8]; 903 int ret; 904 905 if (!j1939_sk_recv_match(priv, &session->skcb)) 906 return -ENOENT; 907 908 memset(dat, 0xff, sizeof(dat)); 909 910 if (session->skcb.addr.type == J1939_ETP) { 911 dat[0] = J1939_ETP_CMD_EOMA; 912 dat[1] = session->total_message_size >> 0; 913 dat[2] = session->total_message_size >> 8; 914 dat[3] = session->total_message_size >> 16; 915 dat[4] = session->total_message_size >> 24; 916 } else { 917 dat[0] = J1939_TP_CMD_EOMA; 918 dat[1] = session->total_message_size; 919 dat[2] = session->total_message_size >> 8; 920 dat[3] = session->pkt.total; 921 } 922 923 if (dat[0] == session->last_txcmd) 924 /* done already */ 925 return 0; 926 927 ret = j1939_tp_tx_ctl(session, true, dat); 928 if (ret < 0) 929 return ret; 930 931 session->last_txcmd = dat[0]; 932 933 /* wait for the EOMA packet to come in */ 934 j1939_tp_set_rxtimeout(session, 1250); 935 936 netdev_dbg(session->priv->ndev, "%p: 0x%p\n", __func__, session); 937 938 return 0; 939 } 940 941 static int j1939_xtp_txnext_receiver(struct j1939_session *session) 942 { 943 struct j1939_priv *priv = session->priv; 944 int ret = 0; 945 946 if (!j1939_tp_im_receiver(&session->skcb)) { 947 netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n", 948 __func__, session); 949 return -EINVAL; 950 } 951 952 switch (session->last_cmd) { 953 case J1939_TP_CMD_RTS: 954 case J1939_ETP_CMD_RTS: 955 ret = j1939_session_tx_cts(session); 956 break; 957 958 case J1939_ETP_CMD_CTS: 959 case J1939_TP_CMD_CTS: 960 case 0xff: /* did some data */ 961 case J1939_ETP_CMD_DPO: 962 if ((session->skcb.addr.type == J1939_TP && 963 j1939_cb_is_broadcast(&session->skcb))) 964 break; 965 966 if (session->pkt.rx >= session->pkt.total) { 967 ret = j1939_session_tx_eoma(session); 968 } else if (session->pkt.rx >= session->pkt.last) { 969 session->last_txcmd = 0; 970 ret = j1939_session_tx_cts(session); 971 } 972 break; 973 default: 974 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n", 975 __func__, session, session->last_cmd); 976 } 977 978 return ret; 979 } 980 981 static int j1939_simple_txnext(struct j1939_session *session) 982 { 983 struct j1939_priv *priv = session->priv; 984 struct sk_buff *se_skb = j1939_session_skb_find(session); 985 struct sk_buff *skb; 986 int ret; 987 988 if (!se_skb) 989 return 0; 990 991 skb = skb_clone(se_skb, GFP_ATOMIC); 992 if (!skb) 993 return -ENOMEM; 994 995 can_skb_set_owner(skb, se_skb->sk); 996 997 j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS); 998 999 ret = j1939_send_one(priv, skb); 1000 if (ret) 1001 return ret; 1002 1003 j1939_sk_errqueue(session, J1939_ERRQUEUE_SCHED); 1004 j1939_sk_queue_activate_next(session); 1005 1006 return 0; 1007 } 1008 1009 static bool j1939_session_deactivate_locked(struct j1939_session *session) 1010 { 1011 bool active = false; 1012 1013 lockdep_assert_held(&session->priv->active_session_list_lock); 1014 1015 if (session->state >= J1939_SESSION_ACTIVE && 1016 session->state < J1939_SESSION_ACTIVE_MAX) { 1017 active = true; 1018 1019 list_del_init(&session->active_session_list_entry); 1020 session->state = J1939_SESSION_DONE; 1021 j1939_session_put(session); 1022 } 1023 1024 return active; 1025 } 1026 1027 static bool j1939_session_deactivate(struct j1939_session *session) 1028 { 1029 bool active; 1030 1031 j1939_session_list_lock(session->priv); 1032 active = j1939_session_deactivate_locked(session); 1033 j1939_session_list_unlock(session->priv); 1034 1035 return active; 1036 } 1037 1038 static void 1039 j1939_session_deactivate_activate_next(struct j1939_session *session) 1040 { 1041 if (j1939_session_deactivate(session)) 1042 j1939_sk_queue_activate_next(session); 1043 } 1044 1045 static void j1939_session_cancel(struct j1939_session *session, 1046 enum j1939_xtp_abort err) 1047 { 1048 struct j1939_priv *priv = session->priv; 1049 1050 WARN_ON_ONCE(!err); 1051 1052 session->err = j1939_xtp_abort_to_errno(priv, err); 1053 /* do not send aborts on incoming broadcasts */ 1054 if (!j1939_cb_is_broadcast(&session->skcb)) { 1055 session->state = J1939_SESSION_WAITING_ABORT; 1056 j1939_xtp_tx_abort(priv, &session->skcb, 1057 !session->transmission, 1058 err, session->skcb.addr.pgn); 1059 } 1060 1061 if (session->sk) 1062 j1939_sk_send_loop_abort(session->sk, session->err); 1063 } 1064 1065 static enum hrtimer_restart j1939_tp_txtimer(struct hrtimer *hrtimer) 1066 { 1067 struct j1939_session *session = 1068 container_of(hrtimer, struct j1939_session, txtimer); 1069 struct j1939_priv *priv = session->priv; 1070 int ret = 0; 1071 1072 if (session->skcb.addr.type == J1939_SIMPLE) { 1073 ret = j1939_simple_txnext(session); 1074 } else { 1075 if (session->transmission) 1076 ret = j1939_xtp_txnext_transmiter(session); 1077 else 1078 ret = j1939_xtp_txnext_receiver(session); 1079 } 1080 1081 switch (ret) { 1082 case -ENOBUFS: 1083 /* Retry limit is currently arbitrary chosen */ 1084 if (session->tx_retry < J1939_XTP_TX_RETRY_LIMIT) { 1085 session->tx_retry++; 1086 j1939_tp_schedule_txtimer(session, 1087 10 + prandom_u32_max(16)); 1088 } else { 1089 netdev_alert(priv->ndev, "%s: 0x%p: tx retry count reached\n", 1090 __func__, session); 1091 session->err = -ENETUNREACH; 1092 j1939_session_rxtimer_cancel(session); 1093 j1939_session_deactivate_activate_next(session); 1094 } 1095 break; 1096 case -ENETDOWN: 1097 /* In this case we should get a netdev_event(), all active 1098 * sessions will be cleared by 1099 * j1939_cancel_all_active_sessions(). So handle this as an 1100 * error, but let j1939_cancel_all_active_sessions() do the 1101 * cleanup including propagation of the error to user space. 1102 */ 1103 break; 1104 case 0: 1105 session->tx_retry = 0; 1106 break; 1107 default: 1108 netdev_alert(priv->ndev, "%s: 0x%p: tx aborted with unknown reason: %i\n", 1109 __func__, session, ret); 1110 if (session->skcb.addr.type != J1939_SIMPLE) { 1111 j1939_tp_set_rxtimeout(session, 1112 J1939_XTP_ABORT_TIMEOUT_MS); 1113 j1939_session_cancel(session, J1939_XTP_ABORT_OTHER); 1114 } else { 1115 session->err = ret; 1116 j1939_session_rxtimer_cancel(session); 1117 j1939_session_deactivate_activate_next(session); 1118 } 1119 } 1120 1121 j1939_session_put(session); 1122 1123 return HRTIMER_NORESTART; 1124 } 1125 1126 static void j1939_session_completed(struct j1939_session *session) 1127 { 1128 struct sk_buff *skb; 1129 1130 if (!session->transmission) { 1131 skb = j1939_session_skb_find(session); 1132 /* distribute among j1939 receivers */ 1133 j1939_sk_recv(session->priv, skb); 1134 } 1135 1136 j1939_session_deactivate_activate_next(session); 1137 } 1138 1139 static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer) 1140 { 1141 struct j1939_session *session = container_of(hrtimer, 1142 struct j1939_session, 1143 rxtimer); 1144 struct j1939_priv *priv = session->priv; 1145 1146 if (session->state == J1939_SESSION_WAITING_ABORT) { 1147 netdev_alert(priv->ndev, "%s: 0x%p: abort rx timeout. Force session deactivation\n", 1148 __func__, session); 1149 1150 j1939_session_deactivate_activate_next(session); 1151 1152 } else if (session->skcb.addr.type == J1939_SIMPLE) { 1153 netdev_alert(priv->ndev, "%s: 0x%p: Timeout. Failed to send simple message.\n", 1154 __func__, session); 1155 1156 /* The message is probably stuck in the CAN controller and can 1157 * be send as soon as CAN bus is in working state again. 1158 */ 1159 session->err = -ETIME; 1160 j1939_session_deactivate(session); 1161 } else { 1162 netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n", 1163 __func__, session); 1164 1165 j1939_session_list_lock(session->priv); 1166 if (session->state >= J1939_SESSION_ACTIVE && 1167 session->state < J1939_SESSION_ACTIVE_MAX) { 1168 j1939_session_get(session); 1169 hrtimer_start(&session->rxtimer, 1170 ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS), 1171 HRTIMER_MODE_REL_SOFT); 1172 j1939_session_cancel(session, J1939_XTP_ABORT_TIMEOUT); 1173 } 1174 j1939_session_list_unlock(session->priv); 1175 } 1176 1177 j1939_session_put(session); 1178 1179 return HRTIMER_NORESTART; 1180 } 1181 1182 static bool j1939_xtp_rx_cmd_bad_pgn(struct j1939_session *session, 1183 const struct sk_buff *skb) 1184 { 1185 const struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1186 pgn_t pgn = j1939_xtp_ctl_to_pgn(skb->data); 1187 struct j1939_priv *priv = session->priv; 1188 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT; 1189 u8 cmd = skb->data[0]; 1190 1191 if (session->skcb.addr.pgn == pgn) 1192 return false; 1193 1194 switch (cmd) { 1195 case J1939_TP_CMD_BAM: 1196 abort = J1939_XTP_NO_ABORT; 1197 break; 1198 1199 case J1939_ETP_CMD_RTS: 1200 case J1939_TP_CMD_RTS: /* fall through */ 1201 abort = J1939_XTP_ABORT_BUSY; 1202 break; 1203 1204 case J1939_ETP_CMD_CTS: 1205 case J1939_TP_CMD_CTS: /* fall through */ 1206 abort = J1939_XTP_ABORT_ECTS_UNXPECTED_PGN; 1207 break; 1208 1209 case J1939_ETP_CMD_DPO: 1210 abort = J1939_XTP_ABORT_BAD_EDPO_PGN; 1211 break; 1212 1213 case J1939_ETP_CMD_EOMA: 1214 case J1939_TP_CMD_EOMA: /* fall through */ 1215 abort = J1939_XTP_ABORT_OTHER; 1216 break; 1217 1218 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */ 1219 abort = J1939_XTP_NO_ABORT; 1220 break; 1221 1222 default: 1223 WARN_ON_ONCE(1); 1224 break; 1225 } 1226 1227 netdev_warn(priv->ndev, "%s: 0x%p: CMD 0x%02x with PGN 0x%05x for running session with different PGN 0x%05x.\n", 1228 __func__, session, cmd, pgn, session->skcb.addr.pgn); 1229 if (abort != J1939_XTP_NO_ABORT) 1230 j1939_xtp_tx_abort(priv, skcb, true, abort, pgn); 1231 1232 return true; 1233 } 1234 1235 static void j1939_xtp_rx_abort_one(struct j1939_priv *priv, struct sk_buff *skb, 1236 bool reverse, bool transmitter) 1237 { 1238 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1239 struct j1939_session *session; 1240 u8 abort = skb->data[1]; 1241 1242 session = j1939_session_get_by_addr(priv, &skcb->addr, reverse, 1243 transmitter); 1244 if (!session) 1245 return; 1246 1247 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1248 goto abort_put; 1249 1250 netdev_info(priv->ndev, "%s: 0x%p: 0x%05x: (%u) %s\n", __func__, 1251 session, j1939_xtp_ctl_to_pgn(skb->data), abort, 1252 j1939_xtp_abort_to_str(abort)); 1253 1254 j1939_session_timers_cancel(session); 1255 session->err = j1939_xtp_abort_to_errno(priv, abort); 1256 if (session->sk) 1257 j1939_sk_send_loop_abort(session->sk, session->err); 1258 j1939_session_deactivate_activate_next(session); 1259 1260 abort_put: 1261 j1939_session_put(session); 1262 } 1263 1264 /* abort packets may come in 2 directions */ 1265 static void 1266 j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb, 1267 bool transmitter) 1268 { 1269 j1939_xtp_rx_abort_one(priv, skb, false, transmitter); 1270 j1939_xtp_rx_abort_one(priv, skb, true, transmitter); 1271 } 1272 1273 static void 1274 j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb) 1275 { 1276 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1277 return; 1278 1279 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1280 1281 session->pkt.tx_acked = session->pkt.total; 1282 j1939_session_timers_cancel(session); 1283 /* transmitted without problems */ 1284 j1939_session_completed(session); 1285 } 1286 1287 static void 1288 j1939_xtp_rx_eoma(struct j1939_priv *priv, struct sk_buff *skb, 1289 bool transmitter) 1290 { 1291 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1292 struct j1939_session *session; 1293 1294 session = j1939_session_get_by_addr(priv, &skcb->addr, true, 1295 transmitter); 1296 if (!session) 1297 return; 1298 1299 j1939_xtp_rx_eoma_one(session, skb); 1300 j1939_session_put(session); 1301 } 1302 1303 static void 1304 j1939_xtp_rx_cts_one(struct j1939_session *session, struct sk_buff *skb) 1305 { 1306 enum j1939_xtp_abort err = J1939_XTP_ABORT_FAULT; 1307 unsigned int pkt; 1308 const u8 *dat; 1309 1310 dat = skb->data; 1311 1312 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1313 return; 1314 1315 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1316 1317 if (session->last_cmd == dat[0]) { 1318 err = J1939_XTP_ABORT_DUP_SEQ; 1319 goto out_session_cancel; 1320 } 1321 1322 if (session->skcb.addr.type == J1939_ETP) 1323 pkt = j1939_etp_ctl_to_packet(dat); 1324 else 1325 pkt = dat[2]; 1326 1327 if (!pkt) 1328 goto out_session_cancel; 1329 else if (dat[1] > session->pkt.block /* 0xff for etp */) 1330 goto out_session_cancel; 1331 1332 /* set packet counters only when not CTS(0) */ 1333 session->pkt.tx_acked = pkt - 1; 1334 j1939_session_skb_drop_old(session); 1335 session->pkt.last = session->pkt.tx_acked + dat[1]; 1336 if (session->pkt.last > session->pkt.total) 1337 /* safety measure */ 1338 session->pkt.last = session->pkt.total; 1339 /* TODO: do not set tx here, do it in txtimer */ 1340 session->pkt.tx = session->pkt.tx_acked; 1341 1342 session->last_cmd = dat[0]; 1343 if (dat[1]) { 1344 j1939_tp_set_rxtimeout(session, 1250); 1345 if (session->transmission) { 1346 if (session->pkt.tx_acked) 1347 j1939_sk_errqueue(session, 1348 J1939_ERRQUEUE_SCHED); 1349 j1939_session_txtimer_cancel(session); 1350 j1939_tp_schedule_txtimer(session, 0); 1351 } 1352 } else { 1353 /* CTS(0) */ 1354 j1939_tp_set_rxtimeout(session, 550); 1355 } 1356 return; 1357 1358 out_session_cancel: 1359 j1939_session_timers_cancel(session); 1360 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS); 1361 j1939_session_cancel(session, err); 1362 } 1363 1364 static void 1365 j1939_xtp_rx_cts(struct j1939_priv *priv, struct sk_buff *skb, bool transmitter) 1366 { 1367 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1368 struct j1939_session *session; 1369 1370 session = j1939_session_get_by_addr(priv, &skcb->addr, true, 1371 transmitter); 1372 if (!session) 1373 return; 1374 j1939_xtp_rx_cts_one(session, skb); 1375 j1939_session_put(session); 1376 } 1377 1378 static struct j1939_session *j1939_session_new(struct j1939_priv *priv, 1379 struct sk_buff *skb, size_t size) 1380 { 1381 struct j1939_session *session; 1382 struct j1939_sk_buff_cb *skcb; 1383 1384 session = kzalloc(sizeof(*session), gfp_any()); 1385 if (!session) 1386 return NULL; 1387 1388 INIT_LIST_HEAD(&session->active_session_list_entry); 1389 INIT_LIST_HEAD(&session->sk_session_queue_entry); 1390 kref_init(&session->kref); 1391 1392 j1939_priv_get(priv); 1393 session->priv = priv; 1394 session->total_message_size = size; 1395 session->state = J1939_SESSION_NEW; 1396 1397 skb_queue_head_init(&session->skb_queue); 1398 skb_queue_tail(&session->skb_queue, skb); 1399 1400 skcb = j1939_skb_to_cb(skb); 1401 memcpy(&session->skcb, skcb, sizeof(session->skcb)); 1402 1403 hrtimer_init(&session->txtimer, CLOCK_MONOTONIC, 1404 HRTIMER_MODE_REL_SOFT); 1405 session->txtimer.function = j1939_tp_txtimer; 1406 hrtimer_init(&session->rxtimer, CLOCK_MONOTONIC, 1407 HRTIMER_MODE_REL_SOFT); 1408 session->rxtimer.function = j1939_tp_rxtimer; 1409 1410 netdev_dbg(priv->ndev, "%s: 0x%p: sa: %02x, da: %02x\n", 1411 __func__, session, skcb->addr.sa, skcb->addr.da); 1412 1413 return session; 1414 } 1415 1416 static struct 1417 j1939_session *j1939_session_fresh_new(struct j1939_priv *priv, 1418 int size, 1419 const struct j1939_sk_buff_cb *rel_skcb) 1420 { 1421 struct sk_buff *skb; 1422 struct j1939_sk_buff_cb *skcb; 1423 struct j1939_session *session; 1424 1425 skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC); 1426 if (unlikely(!skb)) 1427 return NULL; 1428 1429 skb->dev = priv->ndev; 1430 can_skb_reserve(skb); 1431 can_skb_prv(skb)->ifindex = priv->ndev->ifindex; 1432 skcb = j1939_skb_to_cb(skb); 1433 memcpy(skcb, rel_skcb, sizeof(*skcb)); 1434 1435 session = j1939_session_new(priv, skb, skb->len); 1436 if (!session) { 1437 kfree_skb(skb); 1438 return NULL; 1439 } 1440 1441 /* alloc data area */ 1442 skb_put(skb, size); 1443 /* skb is recounted in j1939_session_new() */ 1444 return session; 1445 } 1446 1447 int j1939_session_activate(struct j1939_session *session) 1448 { 1449 struct j1939_priv *priv = session->priv; 1450 struct j1939_session *active = NULL; 1451 int ret = 0; 1452 1453 j1939_session_list_lock(priv); 1454 if (session->skcb.addr.type != J1939_SIMPLE) 1455 active = j1939_session_get_by_addr_locked(priv, 1456 &priv->active_session_list, 1457 &session->skcb.addr, false, 1458 session->transmission); 1459 if (active) { 1460 j1939_session_put(active); 1461 ret = -EAGAIN; 1462 } else { 1463 WARN_ON_ONCE(session->state != J1939_SESSION_NEW); 1464 list_add_tail(&session->active_session_list_entry, 1465 &priv->active_session_list); 1466 j1939_session_get(session); 1467 session->state = J1939_SESSION_ACTIVE; 1468 1469 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", 1470 __func__, session); 1471 } 1472 j1939_session_list_unlock(priv); 1473 1474 return ret; 1475 } 1476 1477 static struct 1478 j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv, 1479 struct sk_buff *skb) 1480 { 1481 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT; 1482 struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb); 1483 struct j1939_session *session; 1484 const u8 *dat; 1485 pgn_t pgn; 1486 int len; 1487 1488 netdev_dbg(priv->ndev, "%s\n", __func__); 1489 1490 dat = skb->data; 1491 pgn = j1939_xtp_ctl_to_pgn(dat); 1492 skcb.addr.pgn = pgn; 1493 1494 if (!j1939_sk_recv_match(priv, &skcb)) 1495 return NULL; 1496 1497 if (skcb.addr.type == J1939_ETP) { 1498 len = j1939_etp_ctl_to_size(dat); 1499 if (len > J1939_MAX_ETP_PACKET_SIZE) 1500 abort = J1939_XTP_ABORT_FAULT; 1501 else if (len > priv->tp_max_packet_size) 1502 abort = J1939_XTP_ABORT_RESOURCE; 1503 else if (len <= J1939_MAX_TP_PACKET_SIZE) 1504 abort = J1939_XTP_ABORT_FAULT; 1505 } else { 1506 len = j1939_tp_ctl_to_size(dat); 1507 if (len > J1939_MAX_TP_PACKET_SIZE) 1508 abort = J1939_XTP_ABORT_FAULT; 1509 else if (len > priv->tp_max_packet_size) 1510 abort = J1939_XTP_ABORT_RESOURCE; 1511 } 1512 1513 if (abort != J1939_XTP_NO_ABORT) { 1514 j1939_xtp_tx_abort(priv, &skcb, true, abort, pgn); 1515 return NULL; 1516 } 1517 1518 session = j1939_session_fresh_new(priv, len, &skcb); 1519 if (!session) { 1520 j1939_xtp_tx_abort(priv, &skcb, true, 1521 J1939_XTP_ABORT_RESOURCE, pgn); 1522 return NULL; 1523 } 1524 1525 /* initialize the control buffer: plain copy */ 1526 session->pkt.total = (len + 6) / 7; 1527 session->pkt.block = 0xff; 1528 if (skcb.addr.type != J1939_ETP) { 1529 if (dat[3] != session->pkt.total) 1530 netdev_alert(priv->ndev, "%s: 0x%p: strange total, %u != %u\n", 1531 __func__, session, session->pkt.total, 1532 dat[3]); 1533 session->pkt.total = dat[3]; 1534 session->pkt.block = min(dat[3], dat[4]); 1535 } 1536 1537 session->pkt.rx = 0; 1538 session->pkt.tx = 0; 1539 1540 WARN_ON_ONCE(j1939_session_activate(session)); 1541 1542 return session; 1543 } 1544 1545 static int j1939_xtp_rx_rts_session_active(struct j1939_session *session, 1546 struct sk_buff *skb) 1547 { 1548 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1549 struct j1939_priv *priv = session->priv; 1550 1551 if (!session->transmission) { 1552 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1553 return -EBUSY; 1554 1555 /* RTS on active session */ 1556 j1939_session_timers_cancel(session); 1557 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS); 1558 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY); 1559 } 1560 1561 if (session->last_cmd != 0) { 1562 /* we received a second rts on the same connection */ 1563 netdev_alert(priv->ndev, "%s: 0x%p: connection exists (%02x %02x). last cmd: %x\n", 1564 __func__, session, skcb->addr.sa, skcb->addr.da, 1565 session->last_cmd); 1566 1567 j1939_session_timers_cancel(session); 1568 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS); 1569 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY); 1570 1571 return -EBUSY; 1572 } 1573 1574 if (session->skcb.addr.sa != skcb->addr.sa || 1575 session->skcb.addr.da != skcb->addr.da) 1576 netdev_warn(priv->ndev, "%s: 0x%p: session->skcb.addr.sa=0x%02x skcb->addr.sa=0x%02x session->skcb.addr.da=0x%02x skcb->addr.da=0x%02x\n", 1577 __func__, session, 1578 session->skcb.addr.sa, skcb->addr.sa, 1579 session->skcb.addr.da, skcb->addr.da); 1580 /* make sure 'sa' & 'da' are correct ! 1581 * They may be 'not filled in yet' for sending 1582 * skb's, since they did not pass the Address Claim ever. 1583 */ 1584 session->skcb.addr.sa = skcb->addr.sa; 1585 session->skcb.addr.da = skcb->addr.da; 1586 1587 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1588 1589 return 0; 1590 } 1591 1592 static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb, 1593 bool transmitter) 1594 { 1595 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1596 struct j1939_session *session; 1597 u8 cmd = skb->data[0]; 1598 1599 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1600 transmitter); 1601 1602 if (!session) { 1603 if (transmitter) { 1604 /* If we're the transmitter and this function is called, 1605 * we received our own RTS. A session has already been 1606 * created. 1607 * 1608 * For some reasons however it might have been destroyed 1609 * already. So don't create a new one here (using 1610 * "j1939_xtp_rx_rts_session_new()") as this will be a 1611 * receiver session. 1612 * 1613 * The reasons the session is already destroyed might 1614 * be: 1615 * - user space closed socket was and the session was 1616 * aborted 1617 * - session was aborted due to external abort message 1618 */ 1619 return; 1620 } 1621 session = j1939_xtp_rx_rts_session_new(priv, skb); 1622 if (!session) 1623 return; 1624 } else { 1625 if (j1939_xtp_rx_rts_session_active(session, skb)) { 1626 j1939_session_put(session); 1627 return; 1628 } 1629 } 1630 session->last_cmd = cmd; 1631 1632 j1939_tp_set_rxtimeout(session, 1250); 1633 1634 if (cmd != J1939_TP_CMD_BAM && !session->transmission) { 1635 j1939_session_txtimer_cancel(session); 1636 j1939_tp_schedule_txtimer(session, 0); 1637 } 1638 1639 j1939_session_put(session); 1640 } 1641 1642 static void j1939_xtp_rx_dpo_one(struct j1939_session *session, 1643 struct sk_buff *skb) 1644 { 1645 const u8 *dat = skb->data; 1646 1647 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1648 return; 1649 1650 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1651 1652 /* transmitted without problems */ 1653 session->pkt.dpo = j1939_etp_ctl_to_packet(skb->data); 1654 session->last_cmd = dat[0]; 1655 j1939_tp_set_rxtimeout(session, 750); 1656 } 1657 1658 static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb, 1659 bool transmitter) 1660 { 1661 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1662 struct j1939_session *session; 1663 1664 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1665 transmitter); 1666 if (!session) { 1667 netdev_info(priv->ndev, 1668 "%s: no connection found\n", __func__); 1669 return; 1670 } 1671 1672 j1939_xtp_rx_dpo_one(session, skb); 1673 j1939_session_put(session); 1674 } 1675 1676 static void j1939_xtp_rx_dat_one(struct j1939_session *session, 1677 struct sk_buff *skb) 1678 { 1679 struct j1939_priv *priv = session->priv; 1680 struct j1939_sk_buff_cb *skcb; 1681 struct sk_buff *se_skb; 1682 const u8 *dat; 1683 u8 *tpdat; 1684 int offset; 1685 int nbytes; 1686 bool final = false; 1687 bool do_cts_eoma = false; 1688 int packet; 1689 1690 skcb = j1939_skb_to_cb(skb); 1691 dat = skb->data; 1692 if (skb->len <= 1) 1693 /* makes no sense */ 1694 goto out_session_cancel; 1695 1696 switch (session->last_cmd) { 1697 case 0xff: 1698 break; 1699 case J1939_ETP_CMD_DPO: 1700 if (skcb->addr.type == J1939_ETP) 1701 break; 1702 /* fall through */ 1703 case J1939_TP_CMD_BAM: /* fall through */ 1704 case J1939_TP_CMD_CTS: /* fall through */ 1705 if (skcb->addr.type != J1939_ETP) 1706 break; 1707 /* fall through */ 1708 default: 1709 netdev_info(priv->ndev, "%s: 0x%p: last %02x\n", __func__, 1710 session, session->last_cmd); 1711 goto out_session_cancel; 1712 } 1713 1714 packet = (dat[0] - 1 + session->pkt.dpo); 1715 if (packet > session->pkt.total || 1716 (session->pkt.rx + 1) > session->pkt.total) { 1717 netdev_info(priv->ndev, "%s: 0x%p: should have been completed\n", 1718 __func__, session); 1719 goto out_session_cancel; 1720 } 1721 se_skb = j1939_session_skb_find(session); 1722 if (!se_skb) { 1723 netdev_warn(priv->ndev, "%s: 0x%p: no skb found\n", __func__, 1724 session); 1725 goto out_session_cancel; 1726 } 1727 1728 skcb = j1939_skb_to_cb(se_skb); 1729 offset = packet * 7 - skcb->offset; 1730 nbytes = se_skb->len - offset; 1731 if (nbytes > 7) 1732 nbytes = 7; 1733 if (nbytes <= 0 || (nbytes + 1) > skb->len) { 1734 netdev_info(priv->ndev, "%s: 0x%p: nbytes %i, len %i\n", 1735 __func__, session, nbytes, skb->len); 1736 goto out_session_cancel; 1737 } 1738 1739 tpdat = se_skb->data; 1740 memcpy(&tpdat[offset], &dat[1], nbytes); 1741 if (packet == session->pkt.rx) 1742 session->pkt.rx++; 1743 1744 if (skcb->addr.type != J1939_ETP && 1745 j1939_cb_is_broadcast(&session->skcb)) { 1746 if (session->pkt.rx >= session->pkt.total) 1747 final = true; 1748 } else { 1749 /* never final, an EOMA must follow */ 1750 if (session->pkt.rx >= session->pkt.last) 1751 do_cts_eoma = true; 1752 } 1753 1754 if (final) { 1755 j1939_session_completed(session); 1756 } else if (do_cts_eoma) { 1757 j1939_tp_set_rxtimeout(session, 1250); 1758 if (!session->transmission) 1759 j1939_tp_schedule_txtimer(session, 0); 1760 } else { 1761 j1939_tp_set_rxtimeout(session, 250); 1762 } 1763 session->last_cmd = 0xff; 1764 j1939_session_put(session); 1765 1766 return; 1767 1768 out_session_cancel: 1769 j1939_session_timers_cancel(session); 1770 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS); 1771 j1939_session_cancel(session, J1939_XTP_ABORT_FAULT); 1772 j1939_session_put(session); 1773 } 1774 1775 static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb) 1776 { 1777 struct j1939_sk_buff_cb *skcb; 1778 struct j1939_session *session; 1779 1780 skcb = j1939_skb_to_cb(skb); 1781 1782 if (j1939_tp_im_transmitter(skcb)) { 1783 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1784 true); 1785 if (!session) 1786 netdev_info(priv->ndev, "%s: no tx connection found\n", 1787 __func__); 1788 else 1789 j1939_xtp_rx_dat_one(session, skb); 1790 } 1791 1792 if (j1939_tp_im_receiver(skcb)) { 1793 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1794 false); 1795 if (!session) 1796 netdev_info(priv->ndev, "%s: no rx connection found\n", 1797 __func__); 1798 else 1799 j1939_xtp_rx_dat_one(session, skb); 1800 } 1801 } 1802 1803 /* j1939 main intf */ 1804 struct j1939_session *j1939_tp_send(struct j1939_priv *priv, 1805 struct sk_buff *skb, size_t size) 1806 { 1807 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1808 struct j1939_session *session; 1809 int ret; 1810 1811 if (skcb->addr.pgn == J1939_TP_PGN_DAT || 1812 skcb->addr.pgn == J1939_TP_PGN_CTL || 1813 skcb->addr.pgn == J1939_ETP_PGN_DAT || 1814 skcb->addr.pgn == J1939_ETP_PGN_CTL) 1815 /* avoid conflict */ 1816 return ERR_PTR(-EDOM); 1817 1818 if (size > priv->tp_max_packet_size) 1819 return ERR_PTR(-EMSGSIZE); 1820 1821 if (size <= 8) 1822 skcb->addr.type = J1939_SIMPLE; 1823 else if (size > J1939_MAX_TP_PACKET_SIZE) 1824 skcb->addr.type = J1939_ETP; 1825 else 1826 skcb->addr.type = J1939_TP; 1827 1828 if (skcb->addr.type == J1939_ETP && 1829 j1939_cb_is_broadcast(skcb)) 1830 return ERR_PTR(-EDESTADDRREQ); 1831 1832 /* fill in addresses from names */ 1833 ret = j1939_ac_fixup(priv, skb); 1834 if (unlikely(ret)) 1835 return ERR_PTR(ret); 1836 1837 /* fix DST flags, it may be used there soon */ 1838 if (j1939_address_is_unicast(skcb->addr.da) && 1839 priv->ents[skcb->addr.da].nusers) 1840 skcb->flags |= J1939_ECU_LOCAL_DST; 1841 1842 /* src is always local, I'm sending ... */ 1843 skcb->flags |= J1939_ECU_LOCAL_SRC; 1844 1845 /* prepare new session */ 1846 session = j1939_session_new(priv, skb, size); 1847 if (!session) 1848 return ERR_PTR(-ENOMEM); 1849 1850 /* skb is recounted in j1939_session_new() */ 1851 session->sk = skb->sk; 1852 session->transmission = true; 1853 session->pkt.total = (size + 6) / 7; 1854 session->pkt.block = skcb->addr.type == J1939_ETP ? 255 : 1855 min(j1939_tp_block ?: 255, session->pkt.total); 1856 1857 if (j1939_cb_is_broadcast(&session->skcb)) 1858 /* set the end-packet for broadcast */ 1859 session->pkt.last = session->pkt.total; 1860 1861 skcb->tskey = session->sk->sk_tskey++; 1862 session->tskey = skcb->tskey; 1863 1864 return session; 1865 } 1866 1867 static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb) 1868 { 1869 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1870 int extd = J1939_TP; 1871 u8 cmd = skb->data[0]; 1872 1873 switch (cmd) { 1874 case J1939_ETP_CMD_RTS: 1875 extd = J1939_ETP; 1876 /* fall through */ 1877 case J1939_TP_CMD_BAM: /* fall through */ 1878 case J1939_TP_CMD_RTS: /* fall through */ 1879 if (skcb->addr.type != extd) 1880 return; 1881 1882 if (cmd == J1939_TP_CMD_RTS && j1939_cb_is_broadcast(skcb)) { 1883 netdev_alert(priv->ndev, "%s: rts without destination (%02x)\n", 1884 __func__, skcb->addr.sa); 1885 return; 1886 } 1887 1888 if (j1939_tp_im_transmitter(skcb)) 1889 j1939_xtp_rx_rts(priv, skb, true); 1890 1891 if (j1939_tp_im_receiver(skcb)) 1892 j1939_xtp_rx_rts(priv, skb, false); 1893 1894 break; 1895 1896 case J1939_ETP_CMD_CTS: 1897 extd = J1939_ETP; 1898 /* fall through */ 1899 case J1939_TP_CMD_CTS: 1900 if (skcb->addr.type != extd) 1901 return; 1902 1903 if (j1939_tp_im_transmitter(skcb)) 1904 j1939_xtp_rx_cts(priv, skb, false); 1905 1906 if (j1939_tp_im_receiver(skcb)) 1907 j1939_xtp_rx_cts(priv, skb, true); 1908 1909 break; 1910 1911 case J1939_ETP_CMD_DPO: 1912 if (skcb->addr.type != J1939_ETP) 1913 return; 1914 1915 if (j1939_tp_im_transmitter(skcb)) 1916 j1939_xtp_rx_dpo(priv, skb, true); 1917 1918 if (j1939_tp_im_receiver(skcb)) 1919 j1939_xtp_rx_dpo(priv, skb, false); 1920 1921 break; 1922 1923 case J1939_ETP_CMD_EOMA: 1924 extd = J1939_ETP; 1925 /* fall through */ 1926 case J1939_TP_CMD_EOMA: 1927 if (skcb->addr.type != extd) 1928 return; 1929 1930 if (j1939_tp_im_transmitter(skcb)) 1931 j1939_xtp_rx_eoma(priv, skb, false); 1932 1933 if (j1939_tp_im_receiver(skcb)) 1934 j1939_xtp_rx_eoma(priv, skb, true); 1935 1936 break; 1937 1938 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */ 1939 if (j1939_tp_im_transmitter(skcb)) 1940 j1939_xtp_rx_abort(priv, skb, true); 1941 1942 if (j1939_tp_im_receiver(skcb)) 1943 j1939_xtp_rx_abort(priv, skb, false); 1944 1945 break; 1946 default: 1947 return; 1948 } 1949 } 1950 1951 int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb) 1952 { 1953 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1954 1955 if (!j1939_tp_im_involved_anydir(skcb)) 1956 return 0; 1957 1958 switch (skcb->addr.pgn) { 1959 case J1939_ETP_PGN_DAT: 1960 skcb->addr.type = J1939_ETP; 1961 /* fall through */ 1962 case J1939_TP_PGN_DAT: 1963 j1939_xtp_rx_dat(priv, skb); 1964 break; 1965 1966 case J1939_ETP_PGN_CTL: 1967 skcb->addr.type = J1939_ETP; 1968 /* fall through */ 1969 case J1939_TP_PGN_CTL: 1970 if (skb->len < 8) 1971 return 0; /* Don't care. Nothing to extract here */ 1972 1973 j1939_tp_cmd_recv(priv, skb); 1974 break; 1975 default: 1976 return 0; /* no problem */ 1977 } 1978 return 1; /* "I processed the message" */ 1979 } 1980 1981 void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb) 1982 { 1983 struct j1939_session *session; 1984 1985 if (!skb->sk) 1986 return; 1987 1988 j1939_session_list_lock(priv); 1989 session = j1939_session_get_simple(priv, skb); 1990 j1939_session_list_unlock(priv); 1991 if (!session) { 1992 netdev_warn(priv->ndev, 1993 "%s: Received already invalidated message\n", 1994 __func__); 1995 return; 1996 } 1997 1998 j1939_session_timers_cancel(session); 1999 j1939_session_deactivate(session); 2000 j1939_session_put(session); 2001 } 2002 2003 int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk) 2004 { 2005 struct j1939_session *session, *saved; 2006 2007 netdev_dbg(priv->ndev, "%s, sk: %p\n", __func__, sk); 2008 j1939_session_list_lock(priv); 2009 list_for_each_entry_safe(session, saved, 2010 &priv->active_session_list, 2011 active_session_list_entry) { 2012 if (!sk || sk == session->sk) { 2013 j1939_session_timers_cancel(session); 2014 session->err = ESHUTDOWN; 2015 j1939_session_deactivate_locked(session); 2016 } 2017 } 2018 j1939_session_list_unlock(priv); 2019 return NOTIFY_DONE; 2020 } 2021 2022 void j1939_tp_init(struct j1939_priv *priv) 2023 { 2024 spin_lock_init(&priv->active_session_list_lock); 2025 INIT_LIST_HEAD(&priv->active_session_list); 2026 priv->tp_max_packet_size = J1939_MAX_ETP_PACKET_SIZE; 2027 } 2028