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 sock_put(session->sk); 259 } 260 261 static void j1939_session_destroy(struct j1939_session *session) 262 { 263 struct sk_buff *skb; 264 265 if (session->transmission) { 266 if (session->err) 267 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ABORT); 268 else 269 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_ACK); 270 } else if (session->err) { 271 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT); 272 } 273 274 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 275 276 WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry)); 277 WARN_ON_ONCE(!list_empty(&session->active_session_list_entry)); 278 279 while ((skb = skb_dequeue(&session->skb_queue)) != NULL) { 280 /* drop ref taken in j1939_session_skb_queue() */ 281 skb_unref(skb); 282 kfree_skb(skb); 283 } 284 __j1939_session_drop(session); 285 j1939_priv_put(session->priv); 286 kfree(session); 287 } 288 289 static void __j1939_session_release(struct kref *kref) 290 { 291 struct j1939_session *session = container_of(kref, struct j1939_session, 292 kref); 293 294 j1939_session_destroy(session); 295 } 296 297 void j1939_session_put(struct j1939_session *session) 298 { 299 kref_put(&session->kref, __j1939_session_release); 300 } 301 302 static void j1939_session_txtimer_cancel(struct j1939_session *session) 303 { 304 if (hrtimer_cancel(&session->txtimer)) 305 j1939_session_put(session); 306 } 307 308 static void j1939_session_rxtimer_cancel(struct j1939_session *session) 309 { 310 if (hrtimer_cancel(&session->rxtimer)) 311 j1939_session_put(session); 312 } 313 314 void j1939_session_timers_cancel(struct j1939_session *session) 315 { 316 j1939_session_txtimer_cancel(session); 317 j1939_session_rxtimer_cancel(session); 318 } 319 320 static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb) 321 { 322 return (!skcb->addr.dst_name && (skcb->addr.da == 0xff)); 323 } 324 325 static void j1939_session_skb_drop_old(struct j1939_session *session) 326 { 327 struct sk_buff *do_skb; 328 struct j1939_sk_buff_cb *do_skcb; 329 unsigned int offset_start; 330 unsigned long flags; 331 332 if (skb_queue_len(&session->skb_queue) < 2) 333 return; 334 335 offset_start = session->pkt.tx_acked * 7; 336 337 spin_lock_irqsave(&session->skb_queue.lock, flags); 338 do_skb = skb_peek(&session->skb_queue); 339 do_skcb = j1939_skb_to_cb(do_skb); 340 341 if ((do_skcb->offset + do_skb->len) < offset_start) { 342 __skb_unlink(do_skb, &session->skb_queue); 343 /* drop ref taken in j1939_session_skb_queue() */ 344 skb_unref(do_skb); 345 spin_unlock_irqrestore(&session->skb_queue.lock, flags); 346 347 kfree_skb(do_skb); 348 } else { 349 spin_unlock_irqrestore(&session->skb_queue.lock, flags); 350 } 351 } 352 353 void j1939_session_skb_queue(struct j1939_session *session, 354 struct sk_buff *skb) 355 { 356 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 357 struct j1939_priv *priv = session->priv; 358 359 j1939_ac_fixup(priv, skb); 360 361 if (j1939_address_is_unicast(skcb->addr.da) && 362 priv->ents[skcb->addr.da].nusers) 363 skcb->flags |= J1939_ECU_LOCAL_DST; 364 365 skcb->flags |= J1939_ECU_LOCAL_SRC; 366 367 skb_get(skb); 368 skb_queue_tail(&session->skb_queue, skb); 369 } 370 371 static struct 372 sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session, 373 unsigned int offset_start) 374 { 375 struct j1939_priv *priv = session->priv; 376 struct j1939_sk_buff_cb *do_skcb; 377 struct sk_buff *skb = NULL; 378 struct sk_buff *do_skb; 379 unsigned long flags; 380 381 spin_lock_irqsave(&session->skb_queue.lock, flags); 382 skb_queue_walk(&session->skb_queue, do_skb) { 383 do_skcb = j1939_skb_to_cb(do_skb); 384 385 if (offset_start >= do_skcb->offset && 386 offset_start < (do_skcb->offset + do_skb->len)) { 387 skb = do_skb; 388 } 389 } 390 391 if (skb) 392 skb_get(skb); 393 394 spin_unlock_irqrestore(&session->skb_queue.lock, flags); 395 396 if (!skb) 397 netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n", 398 __func__, session, offset_start, 399 skb_queue_len(&session->skb_queue)); 400 401 return skb; 402 } 403 404 static struct sk_buff *j1939_session_skb_get(struct j1939_session *session) 405 { 406 unsigned int offset_start; 407 408 offset_start = session->pkt.dpo * 7; 409 return j1939_session_skb_get_by_offset(session, offset_start); 410 } 411 412 /* see if we are receiver 413 * returns 0 for broadcasts, although we will receive them 414 */ 415 static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb) 416 { 417 return skcb->flags & J1939_ECU_LOCAL_DST; 418 } 419 420 /* see if we are sender */ 421 static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb) 422 { 423 return skcb->flags & J1939_ECU_LOCAL_SRC; 424 } 425 426 /* see if we are involved as either receiver or transmitter */ 427 static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap) 428 { 429 if (swap) 430 return j1939_tp_im_receiver(skcb); 431 else 432 return j1939_tp_im_transmitter(skcb); 433 } 434 435 static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb) 436 { 437 return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST); 438 } 439 440 /* extract pgn from flow-ctl message */ 441 static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat) 442 { 443 pgn_t pgn; 444 445 pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0); 446 if (j1939_pgn_is_pdu1(pgn)) 447 pgn &= 0xffff00; 448 return pgn; 449 } 450 451 static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat) 452 { 453 return (dat[2] << 8) + (dat[1] << 0); 454 } 455 456 static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat) 457 { 458 return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0); 459 } 460 461 static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat) 462 { 463 return (dat[4] << 24) | (dat[3] << 16) | 464 (dat[2] << 8) | (dat[1] << 0); 465 } 466 467 /* find existing session: 468 * reverse: swap cb's src & dst 469 * there is no problem with matching broadcasts, since 470 * broadcasts (no dst, no da) would never call this 471 * with reverse == true 472 */ 473 static bool j1939_session_match(struct j1939_addr *se_addr, 474 struct j1939_addr *sk_addr, bool reverse) 475 { 476 if (se_addr->type != sk_addr->type) 477 return false; 478 479 if (reverse) { 480 if (se_addr->src_name) { 481 if (se_addr->src_name != sk_addr->dst_name) 482 return false; 483 } else if (se_addr->sa != sk_addr->da) { 484 return false; 485 } 486 487 if (se_addr->dst_name) { 488 if (se_addr->dst_name != sk_addr->src_name) 489 return false; 490 } else if (se_addr->da != sk_addr->sa) { 491 return false; 492 } 493 } else { 494 if (se_addr->src_name) { 495 if (se_addr->src_name != sk_addr->src_name) 496 return false; 497 } else if (se_addr->sa != sk_addr->sa) { 498 return false; 499 } 500 501 if (se_addr->dst_name) { 502 if (se_addr->dst_name != sk_addr->dst_name) 503 return false; 504 } else if (se_addr->da != sk_addr->da) { 505 return false; 506 } 507 } 508 509 return true; 510 } 511 512 static struct 513 j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv, 514 struct list_head *root, 515 struct j1939_addr *addr, 516 bool reverse, bool transmitter) 517 { 518 struct j1939_session *session; 519 520 lockdep_assert_held(&priv->active_session_list_lock); 521 522 list_for_each_entry(session, root, active_session_list_entry) { 523 j1939_session_get(session); 524 if (j1939_session_match(&session->skcb.addr, addr, reverse) && 525 session->transmission == transmitter) 526 return session; 527 j1939_session_put(session); 528 } 529 530 return NULL; 531 } 532 533 static struct 534 j1939_session *j1939_session_get_simple(struct j1939_priv *priv, 535 struct sk_buff *skb) 536 { 537 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 538 struct j1939_session *session; 539 540 lockdep_assert_held(&priv->active_session_list_lock); 541 542 list_for_each_entry(session, &priv->active_session_list, 543 active_session_list_entry) { 544 j1939_session_get(session); 545 if (session->skcb.addr.type == J1939_SIMPLE && 546 session->tskey == skcb->tskey && session->sk == skb->sk) 547 return session; 548 j1939_session_put(session); 549 } 550 551 return NULL; 552 } 553 554 static struct 555 j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv, 556 struct j1939_addr *addr, 557 bool reverse, bool transmitter) 558 { 559 struct j1939_session *session; 560 561 j1939_session_list_lock(priv); 562 session = j1939_session_get_by_addr_locked(priv, 563 &priv->active_session_list, 564 addr, reverse, transmitter); 565 j1939_session_list_unlock(priv); 566 567 return session; 568 } 569 570 static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb) 571 { 572 u8 tmp = 0; 573 574 swap(skcb->addr.dst_name, skcb->addr.src_name); 575 swap(skcb->addr.da, skcb->addr.sa); 576 577 /* swap SRC and DST flags, leave other untouched */ 578 if (skcb->flags & J1939_ECU_LOCAL_SRC) 579 tmp |= J1939_ECU_LOCAL_DST; 580 if (skcb->flags & J1939_ECU_LOCAL_DST) 581 tmp |= J1939_ECU_LOCAL_SRC; 582 skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST); 583 skcb->flags |= tmp; 584 } 585 586 static struct 587 sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv, 588 const struct j1939_sk_buff_cb *re_skcb, 589 bool ctl, 590 bool swap_src_dst) 591 { 592 struct sk_buff *skb; 593 struct j1939_sk_buff_cb *skcb; 594 595 skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv), 596 GFP_ATOMIC); 597 if (unlikely(!skb)) 598 return ERR_PTR(-ENOMEM); 599 600 skb->dev = priv->ndev; 601 can_skb_reserve(skb); 602 can_skb_prv(skb)->ifindex = priv->ndev->ifindex; 603 can_skb_prv(skb)->skbcnt = 0; 604 /* reserve CAN header */ 605 skb_reserve(skb, offsetof(struct can_frame, data)); 606 607 memcpy(skb->cb, re_skcb, sizeof(skb->cb)); 608 skcb = j1939_skb_to_cb(skb); 609 if (swap_src_dst) 610 j1939_skbcb_swap(skcb); 611 612 if (ctl) { 613 if (skcb->addr.type == J1939_ETP) 614 skcb->addr.pgn = J1939_ETP_PGN_CTL; 615 else 616 skcb->addr.pgn = J1939_TP_PGN_CTL; 617 } else { 618 if (skcb->addr.type == J1939_ETP) 619 skcb->addr.pgn = J1939_ETP_PGN_DAT; 620 else 621 skcb->addr.pgn = J1939_TP_PGN_DAT; 622 } 623 624 return skb; 625 } 626 627 /* TP transmit packet functions */ 628 static int j1939_tp_tx_dat(struct j1939_session *session, 629 const u8 *dat, int len) 630 { 631 struct j1939_priv *priv = session->priv; 632 struct sk_buff *skb; 633 634 skb = j1939_tp_tx_dat_new(priv, &session->skcb, 635 false, false); 636 if (IS_ERR(skb)) 637 return PTR_ERR(skb); 638 639 skb_put_data(skb, dat, len); 640 if (j1939_tp_padding && len < 8) 641 memset(skb_put(skb, 8 - len), 0xff, 8 - len); 642 643 return j1939_send_one(priv, skb); 644 } 645 646 static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv, 647 const struct j1939_sk_buff_cb *re_skcb, 648 bool swap_src_dst, pgn_t pgn, const u8 *dat) 649 { 650 struct sk_buff *skb; 651 u8 *skdat; 652 653 if (!j1939_tp_im_involved(re_skcb, swap_src_dst)) 654 return 0; 655 656 skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst); 657 if (IS_ERR(skb)) 658 return PTR_ERR(skb); 659 660 skdat = skb_put(skb, 8); 661 memcpy(skdat, dat, 5); 662 skdat[5] = (pgn >> 0); 663 skdat[6] = (pgn >> 8); 664 skdat[7] = (pgn >> 16); 665 666 return j1939_send_one(priv, skb); 667 } 668 669 static inline int j1939_tp_tx_ctl(struct j1939_session *session, 670 bool swap_src_dst, const u8 *dat) 671 { 672 struct j1939_priv *priv = session->priv; 673 674 return j1939_xtp_do_tx_ctl(priv, &session->skcb, 675 swap_src_dst, 676 session->skcb.addr.pgn, dat); 677 } 678 679 static int j1939_xtp_tx_abort(struct j1939_priv *priv, 680 const struct j1939_sk_buff_cb *re_skcb, 681 bool swap_src_dst, 682 enum j1939_xtp_abort err, 683 pgn_t pgn) 684 { 685 u8 dat[5]; 686 687 if (!j1939_tp_im_involved(re_skcb, swap_src_dst)) 688 return 0; 689 690 memset(dat, 0xff, sizeof(dat)); 691 dat[0] = J1939_TP_CMD_ABORT; 692 dat[1] = err; 693 return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat); 694 } 695 696 void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec) 697 { 698 j1939_session_get(session); 699 hrtimer_start(&session->txtimer, ms_to_ktime(msec), 700 HRTIMER_MODE_REL_SOFT); 701 } 702 703 static inline void j1939_tp_set_rxtimeout(struct j1939_session *session, 704 int msec) 705 { 706 j1939_session_rxtimer_cancel(session); 707 j1939_session_get(session); 708 hrtimer_start(&session->rxtimer, ms_to_ktime(msec), 709 HRTIMER_MODE_REL_SOFT); 710 } 711 712 static int j1939_session_tx_rts(struct j1939_session *session) 713 { 714 u8 dat[8]; 715 int ret; 716 717 memset(dat, 0xff, sizeof(dat)); 718 719 dat[1] = (session->total_message_size >> 0); 720 dat[2] = (session->total_message_size >> 8); 721 dat[3] = session->pkt.total; 722 723 if (session->skcb.addr.type == J1939_ETP) { 724 dat[0] = J1939_ETP_CMD_RTS; 725 dat[1] = (session->total_message_size >> 0); 726 dat[2] = (session->total_message_size >> 8); 727 dat[3] = (session->total_message_size >> 16); 728 dat[4] = (session->total_message_size >> 24); 729 } else if (j1939_cb_is_broadcast(&session->skcb)) { 730 dat[0] = J1939_TP_CMD_BAM; 731 /* fake cts for broadcast */ 732 session->pkt.tx = 0; 733 } else { 734 dat[0] = J1939_TP_CMD_RTS; 735 dat[4] = dat[3]; 736 } 737 738 if (dat[0] == session->last_txcmd) 739 /* done already */ 740 return 0; 741 742 ret = j1939_tp_tx_ctl(session, false, dat); 743 if (ret < 0) 744 return ret; 745 746 session->last_txcmd = dat[0]; 747 if (dat[0] == J1939_TP_CMD_BAM) { 748 j1939_tp_schedule_txtimer(session, 50); 749 j1939_tp_set_rxtimeout(session, 250); 750 } else { 751 j1939_tp_set_rxtimeout(session, 1250); 752 } 753 754 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 755 756 return 0; 757 } 758 759 static int j1939_session_tx_dpo(struct j1939_session *session) 760 { 761 unsigned int pkt; 762 u8 dat[8]; 763 int ret; 764 765 memset(dat, 0xff, sizeof(dat)); 766 767 dat[0] = J1939_ETP_CMD_DPO; 768 session->pkt.dpo = session->pkt.tx_acked; 769 pkt = session->pkt.dpo; 770 dat[1] = session->pkt.last - session->pkt.tx_acked; 771 dat[2] = (pkt >> 0); 772 dat[3] = (pkt >> 8); 773 dat[4] = (pkt >> 16); 774 775 ret = j1939_tp_tx_ctl(session, false, dat); 776 if (ret < 0) 777 return ret; 778 779 session->last_txcmd = dat[0]; 780 j1939_tp_set_rxtimeout(session, 1250); 781 session->pkt.tx = session->pkt.tx_acked; 782 783 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 784 785 return 0; 786 } 787 788 static int j1939_session_tx_dat(struct j1939_session *session) 789 { 790 struct j1939_priv *priv = session->priv; 791 struct j1939_sk_buff_cb *se_skcb; 792 int offset, pkt_done, pkt_end; 793 unsigned int len, pdelay; 794 struct sk_buff *se_skb; 795 const u8 *tpdat; 796 int ret = 0; 797 u8 dat[8]; 798 799 se_skb = j1939_session_skb_get_by_offset(session, session->pkt.tx * 7); 800 if (!se_skb) 801 return -ENOBUFS; 802 803 se_skcb = j1939_skb_to_cb(se_skb); 804 tpdat = se_skb->data; 805 ret = 0; 806 pkt_done = 0; 807 if (session->skcb.addr.type != J1939_ETP && 808 j1939_cb_is_broadcast(&session->skcb)) 809 pkt_end = session->pkt.total; 810 else 811 pkt_end = session->pkt.last; 812 813 while (session->pkt.tx < pkt_end) { 814 dat[0] = session->pkt.tx - session->pkt.dpo + 1; 815 offset = (session->pkt.tx * 7) - se_skcb->offset; 816 len = se_skb->len - offset; 817 if (len > 7) 818 len = 7; 819 820 if (offset + len > se_skb->len) { 821 netdev_err_once(priv->ndev, 822 "%s: 0x%p: requested data outside of queued buffer: offset %i, len %i, pkt.tx: %i\n", 823 __func__, session, se_skcb->offset, 824 se_skb->len , session->pkt.tx); 825 ret = -EOVERFLOW; 826 goto out_free; 827 } 828 829 if (!len) { 830 ret = -ENOBUFS; 831 break; 832 } 833 834 memcpy(&dat[1], &tpdat[offset], len); 835 ret = j1939_tp_tx_dat(session, dat, len + 1); 836 if (ret < 0) { 837 /* ENOBUFS == CAN interface TX queue is full */ 838 if (ret != -ENOBUFS) 839 netdev_alert(priv->ndev, 840 "%s: 0x%p: queue data error: %i\n", 841 __func__, session, ret); 842 break; 843 } 844 845 session->last_txcmd = 0xff; 846 pkt_done++; 847 session->pkt.tx++; 848 pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 : 849 j1939_tp_packet_delay; 850 851 if (session->pkt.tx < session->pkt.total && pdelay) { 852 j1939_tp_schedule_txtimer(session, pdelay); 853 break; 854 } 855 } 856 857 if (pkt_done) 858 j1939_tp_set_rxtimeout(session, 250); 859 860 out_free: 861 if (ret) 862 kfree_skb(se_skb); 863 else 864 consume_skb(se_skb); 865 866 return ret; 867 } 868 869 static int j1939_xtp_txnext_transmiter(struct j1939_session *session) 870 { 871 struct j1939_priv *priv = session->priv; 872 int ret = 0; 873 874 if (!j1939_tp_im_transmitter(&session->skcb)) { 875 netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n", 876 __func__, session); 877 return -EINVAL; 878 } 879 880 switch (session->last_cmd) { 881 case 0: 882 ret = j1939_session_tx_rts(session); 883 break; 884 885 case J1939_ETP_CMD_CTS: 886 if (session->last_txcmd != J1939_ETP_CMD_DPO) { 887 ret = j1939_session_tx_dpo(session); 888 if (ret) 889 return ret; 890 } 891 892 fallthrough; 893 case J1939_TP_CMD_CTS: 894 case 0xff: /* did some data */ 895 case J1939_ETP_CMD_DPO: 896 case J1939_TP_CMD_BAM: 897 ret = j1939_session_tx_dat(session); 898 899 break; 900 default: 901 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n", 902 __func__, session, session->last_cmd); 903 } 904 905 return ret; 906 } 907 908 static int j1939_session_tx_cts(struct j1939_session *session) 909 { 910 struct j1939_priv *priv = session->priv; 911 unsigned int pkt, len; 912 int ret; 913 u8 dat[8]; 914 915 if (!j1939_sk_recv_match(priv, &session->skcb)) 916 return -ENOENT; 917 918 len = session->pkt.total - session->pkt.rx; 919 len = min3(len, session->pkt.block, j1939_tp_block ?: 255); 920 memset(dat, 0xff, sizeof(dat)); 921 922 if (session->skcb.addr.type == J1939_ETP) { 923 pkt = session->pkt.rx + 1; 924 dat[0] = J1939_ETP_CMD_CTS; 925 dat[1] = len; 926 dat[2] = (pkt >> 0); 927 dat[3] = (pkt >> 8); 928 dat[4] = (pkt >> 16); 929 } else { 930 dat[0] = J1939_TP_CMD_CTS; 931 dat[1] = len; 932 dat[2] = session->pkt.rx + 1; 933 } 934 935 if (dat[0] == session->last_txcmd) 936 /* done already */ 937 return 0; 938 939 ret = j1939_tp_tx_ctl(session, true, dat); 940 if (ret < 0) 941 return ret; 942 943 if (len) 944 /* only mark cts done when len is set */ 945 session->last_txcmd = dat[0]; 946 j1939_tp_set_rxtimeout(session, 1250); 947 948 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 949 950 return 0; 951 } 952 953 static int j1939_session_tx_eoma(struct j1939_session *session) 954 { 955 struct j1939_priv *priv = session->priv; 956 u8 dat[8]; 957 int ret; 958 959 if (!j1939_sk_recv_match(priv, &session->skcb)) 960 return -ENOENT; 961 962 memset(dat, 0xff, sizeof(dat)); 963 964 if (session->skcb.addr.type == J1939_ETP) { 965 dat[0] = J1939_ETP_CMD_EOMA; 966 dat[1] = session->total_message_size >> 0; 967 dat[2] = session->total_message_size >> 8; 968 dat[3] = session->total_message_size >> 16; 969 dat[4] = session->total_message_size >> 24; 970 } else { 971 dat[0] = J1939_TP_CMD_EOMA; 972 dat[1] = session->total_message_size; 973 dat[2] = session->total_message_size >> 8; 974 dat[3] = session->pkt.total; 975 } 976 977 if (dat[0] == session->last_txcmd) 978 /* done already */ 979 return 0; 980 981 ret = j1939_tp_tx_ctl(session, true, dat); 982 if (ret < 0) 983 return ret; 984 985 session->last_txcmd = dat[0]; 986 987 /* wait for the EOMA packet to come in */ 988 j1939_tp_set_rxtimeout(session, 1250); 989 990 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 991 992 return 0; 993 } 994 995 static int j1939_xtp_txnext_receiver(struct j1939_session *session) 996 { 997 struct j1939_priv *priv = session->priv; 998 int ret = 0; 999 1000 if (!j1939_tp_im_receiver(&session->skcb)) { 1001 netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n", 1002 __func__, session); 1003 return -EINVAL; 1004 } 1005 1006 switch (session->last_cmd) { 1007 case J1939_TP_CMD_RTS: 1008 case J1939_ETP_CMD_RTS: 1009 ret = j1939_session_tx_cts(session); 1010 break; 1011 1012 case J1939_ETP_CMD_CTS: 1013 case J1939_TP_CMD_CTS: 1014 case 0xff: /* did some data */ 1015 case J1939_ETP_CMD_DPO: 1016 if ((session->skcb.addr.type == J1939_TP && 1017 j1939_cb_is_broadcast(&session->skcb))) 1018 break; 1019 1020 if (session->pkt.rx >= session->pkt.total) { 1021 ret = j1939_session_tx_eoma(session); 1022 } else if (session->pkt.rx >= session->pkt.last) { 1023 session->last_txcmd = 0; 1024 ret = j1939_session_tx_cts(session); 1025 } 1026 break; 1027 default: 1028 netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n", 1029 __func__, session, session->last_cmd); 1030 } 1031 1032 return ret; 1033 } 1034 1035 static int j1939_simple_txnext(struct j1939_session *session) 1036 { 1037 struct j1939_priv *priv = session->priv; 1038 struct sk_buff *se_skb = j1939_session_skb_get(session); 1039 struct sk_buff *skb; 1040 int ret; 1041 1042 if (!se_skb) 1043 return 0; 1044 1045 skb = skb_clone(se_skb, GFP_ATOMIC); 1046 if (!skb) { 1047 ret = -ENOMEM; 1048 goto out_free; 1049 } 1050 1051 can_skb_set_owner(skb, se_skb->sk); 1052 1053 j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS); 1054 1055 ret = j1939_send_one(priv, skb); 1056 if (ret) 1057 goto out_free; 1058 1059 j1939_sk_errqueue(session, J1939_ERRQUEUE_TX_SCHED); 1060 j1939_sk_queue_activate_next(session); 1061 1062 out_free: 1063 if (ret) 1064 kfree_skb(se_skb); 1065 else 1066 consume_skb(se_skb); 1067 1068 return ret; 1069 } 1070 1071 static bool j1939_session_deactivate_locked(struct j1939_session *session) 1072 { 1073 bool active = false; 1074 1075 lockdep_assert_held(&session->priv->active_session_list_lock); 1076 1077 if (session->state >= J1939_SESSION_ACTIVE && 1078 session->state < J1939_SESSION_ACTIVE_MAX) { 1079 active = true; 1080 1081 list_del_init(&session->active_session_list_entry); 1082 session->state = J1939_SESSION_DONE; 1083 j1939_session_put(session); 1084 } 1085 1086 return active; 1087 } 1088 1089 static bool j1939_session_deactivate(struct j1939_session *session) 1090 { 1091 struct j1939_priv *priv = session->priv; 1092 bool active; 1093 1094 j1939_session_list_lock(priv); 1095 /* This function should be called with a session ref-count of at 1096 * least 2. 1097 */ 1098 WARN_ON_ONCE(kref_read(&session->kref) < 2); 1099 active = j1939_session_deactivate_locked(session); 1100 j1939_session_list_unlock(priv); 1101 1102 return active; 1103 } 1104 1105 static void 1106 j1939_session_deactivate_activate_next(struct j1939_session *session) 1107 { 1108 if (j1939_session_deactivate(session)) 1109 j1939_sk_queue_activate_next(session); 1110 } 1111 1112 static void __j1939_session_cancel(struct j1939_session *session, 1113 enum j1939_xtp_abort err) 1114 { 1115 struct j1939_priv *priv = session->priv; 1116 1117 WARN_ON_ONCE(!err); 1118 lockdep_assert_held(&session->priv->active_session_list_lock); 1119 1120 session->err = j1939_xtp_abort_to_errno(priv, err); 1121 session->state = J1939_SESSION_WAITING_ABORT; 1122 /* do not send aborts on incoming broadcasts */ 1123 if (!j1939_cb_is_broadcast(&session->skcb)) { 1124 j1939_xtp_tx_abort(priv, &session->skcb, 1125 !session->transmission, 1126 err, session->skcb.addr.pgn); 1127 } 1128 1129 if (session->sk) 1130 j1939_sk_send_loop_abort(session->sk, session->err); 1131 else 1132 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT); 1133 } 1134 1135 static void j1939_session_cancel(struct j1939_session *session, 1136 enum j1939_xtp_abort err) 1137 { 1138 j1939_session_list_lock(session->priv); 1139 1140 if (session->state >= J1939_SESSION_ACTIVE && 1141 session->state < J1939_SESSION_WAITING_ABORT) { 1142 j1939_tp_set_rxtimeout(session, J1939_XTP_ABORT_TIMEOUT_MS); 1143 __j1939_session_cancel(session, err); 1144 } 1145 1146 j1939_session_list_unlock(session->priv); 1147 } 1148 1149 static enum hrtimer_restart j1939_tp_txtimer(struct hrtimer *hrtimer) 1150 { 1151 struct j1939_session *session = 1152 container_of(hrtimer, struct j1939_session, txtimer); 1153 struct j1939_priv *priv = session->priv; 1154 int ret = 0; 1155 1156 if (session->skcb.addr.type == J1939_SIMPLE) { 1157 ret = j1939_simple_txnext(session); 1158 } else { 1159 if (session->transmission) 1160 ret = j1939_xtp_txnext_transmiter(session); 1161 else 1162 ret = j1939_xtp_txnext_receiver(session); 1163 } 1164 1165 switch (ret) { 1166 case -ENOBUFS: 1167 /* Retry limit is currently arbitrary chosen */ 1168 if (session->tx_retry < J1939_XTP_TX_RETRY_LIMIT) { 1169 session->tx_retry++; 1170 j1939_tp_schedule_txtimer(session, 1171 10 + get_random_u32_below(16)); 1172 } else { 1173 netdev_alert(priv->ndev, "%s: 0x%p: tx retry count reached\n", 1174 __func__, session); 1175 session->err = -ENETUNREACH; 1176 j1939_session_rxtimer_cancel(session); 1177 j1939_session_deactivate_activate_next(session); 1178 } 1179 break; 1180 case -ENETDOWN: 1181 /* In this case we should get a netdev_event(), all active 1182 * sessions will be cleared by 1183 * j1939_cancel_all_active_sessions(). So handle this as an 1184 * error, but let j1939_cancel_all_active_sessions() do the 1185 * cleanup including propagation of the error to user space. 1186 */ 1187 break; 1188 case -EOVERFLOW: 1189 j1939_session_cancel(session, J1939_XTP_ABORT_ECTS_TOO_BIG); 1190 break; 1191 case 0: 1192 session->tx_retry = 0; 1193 break; 1194 default: 1195 netdev_alert(priv->ndev, "%s: 0x%p: tx aborted with unknown reason: %i\n", 1196 __func__, session, ret); 1197 if (session->skcb.addr.type != J1939_SIMPLE) { 1198 j1939_session_cancel(session, J1939_XTP_ABORT_OTHER); 1199 } else { 1200 session->err = ret; 1201 j1939_session_rxtimer_cancel(session); 1202 j1939_session_deactivate_activate_next(session); 1203 } 1204 } 1205 1206 j1939_session_put(session); 1207 1208 return HRTIMER_NORESTART; 1209 } 1210 1211 static void j1939_session_completed(struct j1939_session *session) 1212 { 1213 struct sk_buff *se_skb; 1214 1215 if (!session->transmission) { 1216 se_skb = j1939_session_skb_get(session); 1217 /* distribute among j1939 receivers */ 1218 j1939_sk_recv(session->priv, se_skb); 1219 consume_skb(se_skb); 1220 } 1221 1222 j1939_session_deactivate_activate_next(session); 1223 } 1224 1225 static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer) 1226 { 1227 struct j1939_session *session = container_of(hrtimer, 1228 struct j1939_session, 1229 rxtimer); 1230 struct j1939_priv *priv = session->priv; 1231 1232 if (session->state == J1939_SESSION_WAITING_ABORT) { 1233 netdev_alert(priv->ndev, "%s: 0x%p: abort rx timeout. Force session deactivation\n", 1234 __func__, session); 1235 1236 j1939_session_deactivate_activate_next(session); 1237 1238 } else if (session->skcb.addr.type == J1939_SIMPLE) { 1239 netdev_alert(priv->ndev, "%s: 0x%p: Timeout. Failed to send simple message.\n", 1240 __func__, session); 1241 1242 /* The message is probably stuck in the CAN controller and can 1243 * be send as soon as CAN bus is in working state again. 1244 */ 1245 session->err = -ETIME; 1246 j1939_session_deactivate(session); 1247 } else { 1248 j1939_session_list_lock(session->priv); 1249 if (session->state >= J1939_SESSION_ACTIVE && 1250 session->state < J1939_SESSION_ACTIVE_MAX) { 1251 netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n", 1252 __func__, session); 1253 j1939_session_get(session); 1254 hrtimer_start(&session->rxtimer, 1255 ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS), 1256 HRTIMER_MODE_REL_SOFT); 1257 __j1939_session_cancel(session, J1939_XTP_ABORT_TIMEOUT); 1258 } 1259 j1939_session_list_unlock(session->priv); 1260 } 1261 1262 j1939_session_put(session); 1263 1264 return HRTIMER_NORESTART; 1265 } 1266 1267 static bool j1939_xtp_rx_cmd_bad_pgn(struct j1939_session *session, 1268 const struct sk_buff *skb) 1269 { 1270 const struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1271 pgn_t pgn = j1939_xtp_ctl_to_pgn(skb->data); 1272 struct j1939_priv *priv = session->priv; 1273 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT; 1274 u8 cmd = skb->data[0]; 1275 1276 if (session->skcb.addr.pgn == pgn) 1277 return false; 1278 1279 switch (cmd) { 1280 case J1939_TP_CMD_BAM: 1281 abort = J1939_XTP_NO_ABORT; 1282 break; 1283 1284 case J1939_ETP_CMD_RTS: 1285 fallthrough; 1286 case J1939_TP_CMD_RTS: 1287 abort = J1939_XTP_ABORT_BUSY; 1288 break; 1289 1290 case J1939_ETP_CMD_CTS: 1291 fallthrough; 1292 case J1939_TP_CMD_CTS: 1293 abort = J1939_XTP_ABORT_ECTS_UNXPECTED_PGN; 1294 break; 1295 1296 case J1939_ETP_CMD_DPO: 1297 abort = J1939_XTP_ABORT_BAD_EDPO_PGN; 1298 break; 1299 1300 case J1939_ETP_CMD_EOMA: 1301 fallthrough; 1302 case J1939_TP_CMD_EOMA: 1303 abort = J1939_XTP_ABORT_OTHER; 1304 break; 1305 1306 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */ 1307 abort = J1939_XTP_NO_ABORT; 1308 break; 1309 1310 default: 1311 WARN_ON_ONCE(1); 1312 break; 1313 } 1314 1315 netdev_warn(priv->ndev, "%s: 0x%p: CMD 0x%02x with PGN 0x%05x for running session with different PGN 0x%05x.\n", 1316 __func__, session, cmd, pgn, session->skcb.addr.pgn); 1317 if (abort != J1939_XTP_NO_ABORT) 1318 j1939_xtp_tx_abort(priv, skcb, true, abort, pgn); 1319 1320 return true; 1321 } 1322 1323 static void j1939_xtp_rx_abort_one(struct j1939_priv *priv, struct sk_buff *skb, 1324 bool reverse, bool transmitter) 1325 { 1326 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1327 struct j1939_session *session; 1328 u8 abort = skb->data[1]; 1329 1330 session = j1939_session_get_by_addr(priv, &skcb->addr, reverse, 1331 transmitter); 1332 if (!session) 1333 return; 1334 1335 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1336 goto abort_put; 1337 1338 netdev_info(priv->ndev, "%s: 0x%p: 0x%05x: (%u) %s\n", __func__, 1339 session, j1939_xtp_ctl_to_pgn(skb->data), abort, 1340 j1939_xtp_abort_to_str(abort)); 1341 1342 j1939_session_timers_cancel(session); 1343 session->err = j1939_xtp_abort_to_errno(priv, abort); 1344 if (session->sk) 1345 j1939_sk_send_loop_abort(session->sk, session->err); 1346 else 1347 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_ABORT); 1348 j1939_session_deactivate_activate_next(session); 1349 1350 abort_put: 1351 j1939_session_put(session); 1352 } 1353 1354 /* abort packets may come in 2 directions */ 1355 static void 1356 j1939_xtp_rx_abort(struct j1939_priv *priv, struct sk_buff *skb, 1357 bool transmitter) 1358 { 1359 j1939_xtp_rx_abort_one(priv, skb, false, transmitter); 1360 j1939_xtp_rx_abort_one(priv, skb, true, transmitter); 1361 } 1362 1363 static void 1364 j1939_xtp_rx_eoma_one(struct j1939_session *session, struct sk_buff *skb) 1365 { 1366 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1367 const u8 *dat; 1368 int len; 1369 1370 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1371 return; 1372 1373 dat = skb->data; 1374 1375 if (skcb->addr.type == J1939_ETP) 1376 len = j1939_etp_ctl_to_size(dat); 1377 else 1378 len = j1939_tp_ctl_to_size(dat); 1379 1380 if (session->total_message_size != len) { 1381 netdev_warn_once(session->priv->ndev, 1382 "%s: 0x%p: Incorrect size. Expected: %i; got: %i.\n", 1383 __func__, session, session->total_message_size, 1384 len); 1385 } 1386 1387 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1388 1389 session->pkt.tx_acked = session->pkt.total; 1390 j1939_session_timers_cancel(session); 1391 /* transmitted without problems */ 1392 j1939_session_completed(session); 1393 } 1394 1395 static void 1396 j1939_xtp_rx_eoma(struct j1939_priv *priv, struct sk_buff *skb, 1397 bool transmitter) 1398 { 1399 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1400 struct j1939_session *session; 1401 1402 session = j1939_session_get_by_addr(priv, &skcb->addr, true, 1403 transmitter); 1404 if (!session) 1405 return; 1406 1407 j1939_xtp_rx_eoma_one(session, skb); 1408 j1939_session_put(session); 1409 } 1410 1411 static void 1412 j1939_xtp_rx_cts_one(struct j1939_session *session, struct sk_buff *skb) 1413 { 1414 enum j1939_xtp_abort err = J1939_XTP_ABORT_FAULT; 1415 unsigned int pkt; 1416 const u8 *dat; 1417 1418 dat = skb->data; 1419 1420 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1421 return; 1422 1423 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1424 1425 if (session->last_cmd == dat[0]) { 1426 err = J1939_XTP_ABORT_DUP_SEQ; 1427 goto out_session_cancel; 1428 } 1429 1430 if (session->skcb.addr.type == J1939_ETP) 1431 pkt = j1939_etp_ctl_to_packet(dat); 1432 else 1433 pkt = dat[2]; 1434 1435 if (!pkt) 1436 goto out_session_cancel; 1437 else if (dat[1] > session->pkt.block /* 0xff for etp */) 1438 goto out_session_cancel; 1439 1440 /* set packet counters only when not CTS(0) */ 1441 session->pkt.tx_acked = pkt - 1; 1442 j1939_session_skb_drop_old(session); 1443 session->pkt.last = session->pkt.tx_acked + dat[1]; 1444 if (session->pkt.last > session->pkt.total) 1445 /* safety measure */ 1446 session->pkt.last = session->pkt.total; 1447 /* TODO: do not set tx here, do it in txtimer */ 1448 session->pkt.tx = session->pkt.tx_acked; 1449 1450 session->last_cmd = dat[0]; 1451 if (dat[1]) { 1452 j1939_tp_set_rxtimeout(session, 1250); 1453 if (session->transmission) { 1454 if (session->pkt.tx_acked) 1455 j1939_sk_errqueue(session, 1456 J1939_ERRQUEUE_TX_SCHED); 1457 j1939_session_txtimer_cancel(session); 1458 j1939_tp_schedule_txtimer(session, 0); 1459 } 1460 } else { 1461 /* CTS(0) */ 1462 j1939_tp_set_rxtimeout(session, 550); 1463 } 1464 return; 1465 1466 out_session_cancel: 1467 j1939_session_timers_cancel(session); 1468 j1939_session_cancel(session, err); 1469 } 1470 1471 static void 1472 j1939_xtp_rx_cts(struct j1939_priv *priv, struct sk_buff *skb, bool transmitter) 1473 { 1474 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1475 struct j1939_session *session; 1476 1477 session = j1939_session_get_by_addr(priv, &skcb->addr, true, 1478 transmitter); 1479 if (!session) 1480 return; 1481 j1939_xtp_rx_cts_one(session, skb); 1482 j1939_session_put(session); 1483 } 1484 1485 static struct j1939_session *j1939_session_new(struct j1939_priv *priv, 1486 struct sk_buff *skb, size_t size) 1487 { 1488 struct j1939_session *session; 1489 struct j1939_sk_buff_cb *skcb; 1490 1491 session = kzalloc(sizeof(*session), gfp_any()); 1492 if (!session) 1493 return NULL; 1494 1495 INIT_LIST_HEAD(&session->active_session_list_entry); 1496 INIT_LIST_HEAD(&session->sk_session_queue_entry); 1497 kref_init(&session->kref); 1498 1499 j1939_priv_get(priv); 1500 session->priv = priv; 1501 session->total_message_size = size; 1502 session->state = J1939_SESSION_NEW; 1503 1504 skb_queue_head_init(&session->skb_queue); 1505 skb_queue_tail(&session->skb_queue, skb); 1506 1507 skcb = j1939_skb_to_cb(skb); 1508 memcpy(&session->skcb, skcb, sizeof(session->skcb)); 1509 1510 hrtimer_init(&session->txtimer, CLOCK_MONOTONIC, 1511 HRTIMER_MODE_REL_SOFT); 1512 session->txtimer.function = j1939_tp_txtimer; 1513 hrtimer_init(&session->rxtimer, CLOCK_MONOTONIC, 1514 HRTIMER_MODE_REL_SOFT); 1515 session->rxtimer.function = j1939_tp_rxtimer; 1516 1517 netdev_dbg(priv->ndev, "%s: 0x%p: sa: %02x, da: %02x\n", 1518 __func__, session, skcb->addr.sa, skcb->addr.da); 1519 1520 return session; 1521 } 1522 1523 static struct 1524 j1939_session *j1939_session_fresh_new(struct j1939_priv *priv, 1525 int size, 1526 const struct j1939_sk_buff_cb *rel_skcb) 1527 { 1528 struct sk_buff *skb; 1529 struct j1939_sk_buff_cb *skcb; 1530 struct j1939_session *session; 1531 1532 skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC); 1533 if (unlikely(!skb)) 1534 return NULL; 1535 1536 skb->dev = priv->ndev; 1537 can_skb_reserve(skb); 1538 can_skb_prv(skb)->ifindex = priv->ndev->ifindex; 1539 can_skb_prv(skb)->skbcnt = 0; 1540 skcb = j1939_skb_to_cb(skb); 1541 memcpy(skcb, rel_skcb, sizeof(*skcb)); 1542 1543 session = j1939_session_new(priv, skb, size); 1544 if (!session) { 1545 kfree_skb(skb); 1546 return NULL; 1547 } 1548 1549 /* alloc data area */ 1550 skb_put(skb, size); 1551 /* skb is recounted in j1939_session_new() */ 1552 return session; 1553 } 1554 1555 int j1939_session_activate(struct j1939_session *session) 1556 { 1557 struct j1939_priv *priv = session->priv; 1558 struct j1939_session *active = NULL; 1559 int ret = 0; 1560 1561 j1939_session_list_lock(priv); 1562 if (session->skcb.addr.type != J1939_SIMPLE) 1563 active = j1939_session_get_by_addr_locked(priv, 1564 &priv->active_session_list, 1565 &session->skcb.addr, false, 1566 session->transmission); 1567 if (active) { 1568 j1939_session_put(active); 1569 ret = -EAGAIN; 1570 } else { 1571 WARN_ON_ONCE(session->state != J1939_SESSION_NEW); 1572 list_add_tail(&session->active_session_list_entry, 1573 &priv->active_session_list); 1574 j1939_session_get(session); 1575 session->state = J1939_SESSION_ACTIVE; 1576 1577 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", 1578 __func__, session); 1579 } 1580 j1939_session_list_unlock(priv); 1581 1582 return ret; 1583 } 1584 1585 static struct 1586 j1939_session *j1939_xtp_rx_rts_session_new(struct j1939_priv *priv, 1587 struct sk_buff *skb) 1588 { 1589 enum j1939_xtp_abort abort = J1939_XTP_NO_ABORT; 1590 struct j1939_sk_buff_cb skcb = *j1939_skb_to_cb(skb); 1591 struct j1939_session *session; 1592 const u8 *dat; 1593 pgn_t pgn; 1594 int len; 1595 1596 netdev_dbg(priv->ndev, "%s\n", __func__); 1597 1598 dat = skb->data; 1599 pgn = j1939_xtp_ctl_to_pgn(dat); 1600 skcb.addr.pgn = pgn; 1601 1602 if (!j1939_sk_recv_match(priv, &skcb)) 1603 return NULL; 1604 1605 if (skcb.addr.type == J1939_ETP) { 1606 len = j1939_etp_ctl_to_size(dat); 1607 if (len > J1939_MAX_ETP_PACKET_SIZE) 1608 abort = J1939_XTP_ABORT_FAULT; 1609 else if (len > priv->tp_max_packet_size) 1610 abort = J1939_XTP_ABORT_RESOURCE; 1611 else if (len <= J1939_MAX_TP_PACKET_SIZE) 1612 abort = J1939_XTP_ABORT_FAULT; 1613 } else { 1614 len = j1939_tp_ctl_to_size(dat); 1615 if (len > J1939_MAX_TP_PACKET_SIZE) 1616 abort = J1939_XTP_ABORT_FAULT; 1617 else if (len > priv->tp_max_packet_size) 1618 abort = J1939_XTP_ABORT_RESOURCE; 1619 else if (len < J1939_MIN_TP_PACKET_SIZE) 1620 abort = J1939_XTP_ABORT_FAULT; 1621 } 1622 1623 if (abort != J1939_XTP_NO_ABORT) { 1624 j1939_xtp_tx_abort(priv, &skcb, true, abort, pgn); 1625 return NULL; 1626 } 1627 1628 session = j1939_session_fresh_new(priv, len, &skcb); 1629 if (!session) { 1630 j1939_xtp_tx_abort(priv, &skcb, true, 1631 J1939_XTP_ABORT_RESOURCE, pgn); 1632 return NULL; 1633 } 1634 1635 /* initialize the control buffer: plain copy */ 1636 session->pkt.total = (len + 6) / 7; 1637 session->pkt.block = 0xff; 1638 if (skcb.addr.type != J1939_ETP) { 1639 if (dat[3] != session->pkt.total) 1640 netdev_alert(priv->ndev, "%s: 0x%p: strange total, %u != %u\n", 1641 __func__, session, session->pkt.total, 1642 dat[3]); 1643 session->pkt.total = dat[3]; 1644 session->pkt.block = min(dat[3], dat[4]); 1645 } 1646 1647 session->pkt.rx = 0; 1648 session->pkt.tx = 0; 1649 1650 session->tskey = priv->rx_tskey++; 1651 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_RTS); 1652 1653 WARN_ON_ONCE(j1939_session_activate(session)); 1654 1655 return session; 1656 } 1657 1658 static int j1939_xtp_rx_rts_session_active(struct j1939_session *session, 1659 struct sk_buff *skb) 1660 { 1661 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1662 struct j1939_priv *priv = session->priv; 1663 1664 if (!session->transmission) { 1665 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1666 return -EBUSY; 1667 1668 /* RTS on active session */ 1669 j1939_session_timers_cancel(session); 1670 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY); 1671 } 1672 1673 if (session->last_cmd != 0) { 1674 /* we received a second rts on the same connection */ 1675 netdev_alert(priv->ndev, "%s: 0x%p: connection exists (%02x %02x). last cmd: %x\n", 1676 __func__, session, skcb->addr.sa, skcb->addr.da, 1677 session->last_cmd); 1678 1679 j1939_session_timers_cancel(session); 1680 j1939_session_cancel(session, J1939_XTP_ABORT_BUSY); 1681 1682 return -EBUSY; 1683 } 1684 1685 if (session->skcb.addr.sa != skcb->addr.sa || 1686 session->skcb.addr.da != skcb->addr.da) 1687 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", 1688 __func__, session, 1689 session->skcb.addr.sa, skcb->addr.sa, 1690 session->skcb.addr.da, skcb->addr.da); 1691 /* make sure 'sa' & 'da' are correct ! 1692 * They may be 'not filled in yet' for sending 1693 * skb's, since they did not pass the Address Claim ever. 1694 */ 1695 session->skcb.addr.sa = skcb->addr.sa; 1696 session->skcb.addr.da = skcb->addr.da; 1697 1698 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1699 1700 return 0; 1701 } 1702 1703 static void j1939_xtp_rx_rts(struct j1939_priv *priv, struct sk_buff *skb, 1704 bool transmitter) 1705 { 1706 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1707 struct j1939_session *session; 1708 u8 cmd = skb->data[0]; 1709 1710 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1711 transmitter); 1712 1713 if (!session) { 1714 if (transmitter) { 1715 /* If we're the transmitter and this function is called, 1716 * we received our own RTS. A session has already been 1717 * created. 1718 * 1719 * For some reasons however it might have been destroyed 1720 * already. So don't create a new one here (using 1721 * "j1939_xtp_rx_rts_session_new()") as this will be a 1722 * receiver session. 1723 * 1724 * The reasons the session is already destroyed might 1725 * be: 1726 * - user space closed socket was and the session was 1727 * aborted 1728 * - session was aborted due to external abort message 1729 */ 1730 return; 1731 } 1732 session = j1939_xtp_rx_rts_session_new(priv, skb); 1733 if (!session) { 1734 if (cmd == J1939_TP_CMD_BAM && j1939_sk_recv_match(priv, skcb)) 1735 netdev_info(priv->ndev, "%s: failed to create TP BAM session\n", 1736 __func__); 1737 return; 1738 } 1739 } else { 1740 if (j1939_xtp_rx_rts_session_active(session, skb)) { 1741 j1939_session_put(session); 1742 return; 1743 } 1744 } 1745 session->last_cmd = cmd; 1746 1747 if (cmd == J1939_TP_CMD_BAM) { 1748 if (!session->transmission) 1749 j1939_tp_set_rxtimeout(session, 750); 1750 } else { 1751 if (!session->transmission) { 1752 j1939_session_txtimer_cancel(session); 1753 j1939_tp_schedule_txtimer(session, 0); 1754 } 1755 j1939_tp_set_rxtimeout(session, 1250); 1756 } 1757 1758 j1939_session_put(session); 1759 } 1760 1761 static void j1939_xtp_rx_dpo_one(struct j1939_session *session, 1762 struct sk_buff *skb) 1763 { 1764 const u8 *dat = skb->data; 1765 1766 if (j1939_xtp_rx_cmd_bad_pgn(session, skb)) 1767 return; 1768 1769 netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session); 1770 1771 /* transmitted without problems */ 1772 session->pkt.dpo = j1939_etp_ctl_to_packet(skb->data); 1773 session->last_cmd = dat[0]; 1774 j1939_tp_set_rxtimeout(session, 750); 1775 1776 if (!session->transmission) 1777 j1939_sk_errqueue(session, J1939_ERRQUEUE_RX_DPO); 1778 } 1779 1780 static void j1939_xtp_rx_dpo(struct j1939_priv *priv, struct sk_buff *skb, 1781 bool transmitter) 1782 { 1783 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1784 struct j1939_session *session; 1785 1786 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1787 transmitter); 1788 if (!session) { 1789 netdev_info(priv->ndev, 1790 "%s: no connection found\n", __func__); 1791 return; 1792 } 1793 1794 j1939_xtp_rx_dpo_one(session, skb); 1795 j1939_session_put(session); 1796 } 1797 1798 static void j1939_xtp_rx_dat_one(struct j1939_session *session, 1799 struct sk_buff *skb) 1800 { 1801 enum j1939_xtp_abort abort = J1939_XTP_ABORT_FAULT; 1802 struct j1939_priv *priv = session->priv; 1803 struct j1939_sk_buff_cb *skcb, *se_skcb; 1804 struct sk_buff *se_skb = NULL; 1805 const u8 *dat; 1806 u8 *tpdat; 1807 int offset; 1808 int nbytes; 1809 bool final = false; 1810 bool remain = false; 1811 bool do_cts_eoma = false; 1812 int packet; 1813 1814 skcb = j1939_skb_to_cb(skb); 1815 dat = skb->data; 1816 if (skb->len != 8) { 1817 /* makes no sense */ 1818 abort = J1939_XTP_ABORT_UNEXPECTED_DATA; 1819 goto out_session_cancel; 1820 } 1821 1822 switch (session->last_cmd) { 1823 case 0xff: 1824 break; 1825 case J1939_ETP_CMD_DPO: 1826 if (skcb->addr.type == J1939_ETP) 1827 break; 1828 fallthrough; 1829 case J1939_TP_CMD_BAM: 1830 fallthrough; 1831 case J1939_TP_CMD_CTS: 1832 if (skcb->addr.type != J1939_ETP) 1833 break; 1834 fallthrough; 1835 default: 1836 netdev_info(priv->ndev, "%s: 0x%p: last %02x\n", __func__, 1837 session, session->last_cmd); 1838 goto out_session_cancel; 1839 } 1840 1841 packet = (dat[0] - 1 + session->pkt.dpo); 1842 if (packet > session->pkt.total || 1843 (session->pkt.rx + 1) > session->pkt.total) { 1844 netdev_info(priv->ndev, "%s: 0x%p: should have been completed\n", 1845 __func__, session); 1846 goto out_session_cancel; 1847 } 1848 1849 se_skb = j1939_session_skb_get_by_offset(session, packet * 7); 1850 if (!se_skb) { 1851 netdev_warn(priv->ndev, "%s: 0x%p: no skb found\n", __func__, 1852 session); 1853 goto out_session_cancel; 1854 } 1855 1856 se_skcb = j1939_skb_to_cb(se_skb); 1857 offset = packet * 7 - se_skcb->offset; 1858 nbytes = se_skb->len - offset; 1859 if (nbytes > 7) 1860 nbytes = 7; 1861 if (nbytes <= 0 || (nbytes + 1) > skb->len) { 1862 netdev_info(priv->ndev, "%s: 0x%p: nbytes %i, len %i\n", 1863 __func__, session, nbytes, skb->len); 1864 goto out_session_cancel; 1865 } 1866 1867 tpdat = se_skb->data; 1868 if (!session->transmission) { 1869 memcpy(&tpdat[offset], &dat[1], nbytes); 1870 } else { 1871 int err; 1872 1873 err = memcmp(&tpdat[offset], &dat[1], nbytes); 1874 if (err) 1875 netdev_err_once(priv->ndev, 1876 "%s: 0x%p: Data of RX-looped back packet (%*ph) doesn't match TX data (%*ph)!\n", 1877 __func__, session, 1878 nbytes, &dat[1], 1879 nbytes, &tpdat[offset]); 1880 } 1881 1882 if (packet == session->pkt.rx) 1883 session->pkt.rx++; 1884 1885 if (se_skcb->addr.type != J1939_ETP && 1886 j1939_cb_is_broadcast(&session->skcb)) { 1887 if (session->pkt.rx >= session->pkt.total) 1888 final = true; 1889 else 1890 remain = true; 1891 } else { 1892 /* never final, an EOMA must follow */ 1893 if (session->pkt.rx >= session->pkt.last) 1894 do_cts_eoma = true; 1895 } 1896 1897 if (final) { 1898 j1939_session_timers_cancel(session); 1899 j1939_session_completed(session); 1900 } else if (remain) { 1901 if (!session->transmission) 1902 j1939_tp_set_rxtimeout(session, 750); 1903 } else if (do_cts_eoma) { 1904 j1939_tp_set_rxtimeout(session, 1250); 1905 if (!session->transmission) 1906 j1939_tp_schedule_txtimer(session, 0); 1907 } else { 1908 j1939_tp_set_rxtimeout(session, 750); 1909 } 1910 session->last_cmd = 0xff; 1911 consume_skb(se_skb); 1912 j1939_session_put(session); 1913 1914 return; 1915 1916 out_session_cancel: 1917 kfree_skb(se_skb); 1918 j1939_session_timers_cancel(session); 1919 j1939_session_cancel(session, abort); 1920 j1939_session_put(session); 1921 } 1922 1923 static void j1939_xtp_rx_dat(struct j1939_priv *priv, struct sk_buff *skb) 1924 { 1925 struct j1939_sk_buff_cb *skcb; 1926 struct j1939_session *session; 1927 1928 skcb = j1939_skb_to_cb(skb); 1929 1930 if (j1939_tp_im_transmitter(skcb)) { 1931 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1932 true); 1933 if (!session) 1934 netdev_info(priv->ndev, "%s: no tx connection found\n", 1935 __func__); 1936 else 1937 j1939_xtp_rx_dat_one(session, skb); 1938 } 1939 1940 if (j1939_tp_im_receiver(skcb)) { 1941 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1942 false); 1943 if (!session) 1944 netdev_info(priv->ndev, "%s: no rx connection found\n", 1945 __func__); 1946 else 1947 j1939_xtp_rx_dat_one(session, skb); 1948 } 1949 1950 if (j1939_cb_is_broadcast(skcb)) { 1951 session = j1939_session_get_by_addr(priv, &skcb->addr, false, 1952 false); 1953 if (session) 1954 j1939_xtp_rx_dat_one(session, skb); 1955 } 1956 } 1957 1958 /* j1939 main intf */ 1959 struct j1939_session *j1939_tp_send(struct j1939_priv *priv, 1960 struct sk_buff *skb, size_t size) 1961 { 1962 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 1963 struct j1939_session *session; 1964 int ret; 1965 1966 if (skcb->addr.pgn == J1939_TP_PGN_DAT || 1967 skcb->addr.pgn == J1939_TP_PGN_CTL || 1968 skcb->addr.pgn == J1939_ETP_PGN_DAT || 1969 skcb->addr.pgn == J1939_ETP_PGN_CTL) 1970 /* avoid conflict */ 1971 return ERR_PTR(-EDOM); 1972 1973 if (size > priv->tp_max_packet_size) 1974 return ERR_PTR(-EMSGSIZE); 1975 1976 if (size <= 8) 1977 skcb->addr.type = J1939_SIMPLE; 1978 else if (size > J1939_MAX_TP_PACKET_SIZE) 1979 skcb->addr.type = J1939_ETP; 1980 else 1981 skcb->addr.type = J1939_TP; 1982 1983 if (skcb->addr.type == J1939_ETP && 1984 j1939_cb_is_broadcast(skcb)) 1985 return ERR_PTR(-EDESTADDRREQ); 1986 1987 /* fill in addresses from names */ 1988 ret = j1939_ac_fixup(priv, skb); 1989 if (unlikely(ret)) 1990 return ERR_PTR(ret); 1991 1992 /* fix DST flags, it may be used there soon */ 1993 if (j1939_address_is_unicast(skcb->addr.da) && 1994 priv->ents[skcb->addr.da].nusers) 1995 skcb->flags |= J1939_ECU_LOCAL_DST; 1996 1997 /* src is always local, I'm sending ... */ 1998 skcb->flags |= J1939_ECU_LOCAL_SRC; 1999 2000 /* prepare new session */ 2001 session = j1939_session_new(priv, skb, size); 2002 if (!session) 2003 return ERR_PTR(-ENOMEM); 2004 2005 /* skb is recounted in j1939_session_new() */ 2006 sock_hold(skb->sk); 2007 session->sk = skb->sk; 2008 session->transmission = true; 2009 session->pkt.total = (size + 6) / 7; 2010 session->pkt.block = skcb->addr.type == J1939_ETP ? 255 : 2011 min(j1939_tp_block ?: 255, session->pkt.total); 2012 2013 if (j1939_cb_is_broadcast(&session->skcb)) 2014 /* set the end-packet for broadcast */ 2015 session->pkt.last = session->pkt.total; 2016 2017 skcb->tskey = atomic_inc_return(&session->sk->sk_tskey) - 1; 2018 session->tskey = skcb->tskey; 2019 2020 return session; 2021 } 2022 2023 static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb) 2024 { 2025 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 2026 int extd = J1939_TP; 2027 u8 cmd = skb->data[0]; 2028 2029 switch (cmd) { 2030 case J1939_ETP_CMD_RTS: 2031 extd = J1939_ETP; 2032 fallthrough; 2033 case J1939_TP_CMD_BAM: 2034 if (cmd == J1939_TP_CMD_BAM && !j1939_cb_is_broadcast(skcb)) { 2035 netdev_err_once(priv->ndev, "%s: BAM to unicast (%02x), ignoring!\n", 2036 __func__, skcb->addr.sa); 2037 return; 2038 } 2039 fallthrough; 2040 case J1939_TP_CMD_RTS: 2041 if (skcb->addr.type != extd) 2042 return; 2043 2044 if (cmd == J1939_TP_CMD_RTS && j1939_cb_is_broadcast(skcb)) { 2045 netdev_alert(priv->ndev, "%s: rts without destination (%02x)\n", 2046 __func__, skcb->addr.sa); 2047 return; 2048 } 2049 2050 if (j1939_tp_im_transmitter(skcb)) 2051 j1939_xtp_rx_rts(priv, skb, true); 2052 2053 if (j1939_tp_im_receiver(skcb) || j1939_cb_is_broadcast(skcb)) 2054 j1939_xtp_rx_rts(priv, skb, false); 2055 2056 break; 2057 2058 case J1939_ETP_CMD_CTS: 2059 extd = J1939_ETP; 2060 fallthrough; 2061 case J1939_TP_CMD_CTS: 2062 if (skcb->addr.type != extd) 2063 return; 2064 2065 if (j1939_tp_im_transmitter(skcb)) 2066 j1939_xtp_rx_cts(priv, skb, false); 2067 2068 if (j1939_tp_im_receiver(skcb)) 2069 j1939_xtp_rx_cts(priv, skb, true); 2070 2071 break; 2072 2073 case J1939_ETP_CMD_DPO: 2074 if (skcb->addr.type != J1939_ETP) 2075 return; 2076 2077 if (j1939_tp_im_transmitter(skcb)) 2078 j1939_xtp_rx_dpo(priv, skb, true); 2079 2080 if (j1939_tp_im_receiver(skcb)) 2081 j1939_xtp_rx_dpo(priv, skb, false); 2082 2083 break; 2084 2085 case J1939_ETP_CMD_EOMA: 2086 extd = J1939_ETP; 2087 fallthrough; 2088 case J1939_TP_CMD_EOMA: 2089 if (skcb->addr.type != extd) 2090 return; 2091 2092 if (j1939_tp_im_transmitter(skcb)) 2093 j1939_xtp_rx_eoma(priv, skb, false); 2094 2095 if (j1939_tp_im_receiver(skcb)) 2096 j1939_xtp_rx_eoma(priv, skb, true); 2097 2098 break; 2099 2100 case J1939_ETP_CMD_ABORT: /* && J1939_TP_CMD_ABORT */ 2101 if (j1939_cb_is_broadcast(skcb)) { 2102 netdev_err_once(priv->ndev, "%s: abort to broadcast (%02x), ignoring!\n", 2103 __func__, skcb->addr.sa); 2104 return; 2105 } 2106 2107 if (j1939_tp_im_transmitter(skcb)) 2108 j1939_xtp_rx_abort(priv, skb, true); 2109 2110 if (j1939_tp_im_receiver(skcb)) 2111 j1939_xtp_rx_abort(priv, skb, false); 2112 2113 break; 2114 default: 2115 return; 2116 } 2117 } 2118 2119 int j1939_tp_recv(struct j1939_priv *priv, struct sk_buff *skb) 2120 { 2121 struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb); 2122 2123 if (!j1939_tp_im_involved_anydir(skcb) && !j1939_cb_is_broadcast(skcb)) 2124 return 0; 2125 2126 switch (skcb->addr.pgn) { 2127 case J1939_ETP_PGN_DAT: 2128 skcb->addr.type = J1939_ETP; 2129 fallthrough; 2130 case J1939_TP_PGN_DAT: 2131 j1939_xtp_rx_dat(priv, skb); 2132 break; 2133 2134 case J1939_ETP_PGN_CTL: 2135 skcb->addr.type = J1939_ETP; 2136 fallthrough; 2137 case J1939_TP_PGN_CTL: 2138 if (skb->len < 8) 2139 return 0; /* Don't care. Nothing to extract here */ 2140 2141 j1939_tp_cmd_recv(priv, skb); 2142 break; 2143 default: 2144 return 0; /* no problem */ 2145 } 2146 return 1; /* "I processed the message" */ 2147 } 2148 2149 void j1939_simple_recv(struct j1939_priv *priv, struct sk_buff *skb) 2150 { 2151 struct j1939_session *session; 2152 2153 if (!skb->sk) 2154 return; 2155 2156 if (skb->sk->sk_family != AF_CAN || 2157 skb->sk->sk_protocol != CAN_J1939) 2158 return; 2159 2160 j1939_session_list_lock(priv); 2161 session = j1939_session_get_simple(priv, skb); 2162 j1939_session_list_unlock(priv); 2163 if (!session) { 2164 netdev_warn(priv->ndev, 2165 "%s: Received already invalidated message\n", 2166 __func__); 2167 return; 2168 } 2169 2170 j1939_session_timers_cancel(session); 2171 j1939_session_deactivate(session); 2172 j1939_session_put(session); 2173 } 2174 2175 int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk) 2176 { 2177 struct j1939_session *session, *saved; 2178 2179 netdev_dbg(priv->ndev, "%s, sk: %p\n", __func__, sk); 2180 j1939_session_list_lock(priv); 2181 list_for_each_entry_safe(session, saved, 2182 &priv->active_session_list, 2183 active_session_list_entry) { 2184 if (!sk || sk == session->sk) { 2185 if (hrtimer_try_to_cancel(&session->txtimer) == 1) 2186 j1939_session_put(session); 2187 if (hrtimer_try_to_cancel(&session->rxtimer) == 1) 2188 j1939_session_put(session); 2189 2190 session->err = ESHUTDOWN; 2191 j1939_session_deactivate_locked(session); 2192 } 2193 } 2194 j1939_session_list_unlock(priv); 2195 return NOTIFY_DONE; 2196 } 2197 2198 void j1939_tp_init(struct j1939_priv *priv) 2199 { 2200 spin_lock_init(&priv->active_session_list_lock); 2201 INIT_LIST_HEAD(&priv->active_session_list); 2202 priv->tp_max_packet_size = J1939_MAX_ETP_PACKET_SIZE; 2203 } 2204