1 /* 2 * Copyright (C) 2011 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ 19 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/list.h> 23 #include <linux/nfc.h> 24 25 #include "nfc.h" 26 #include "llcp.h" 27 28 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; 29 30 static struct list_head llcp_devices; 31 32 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); 33 34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) 35 { 36 write_lock(&l->lock); 37 sk_add_node(sk, &l->head); 38 write_unlock(&l->lock); 39 } 40 41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) 42 { 43 write_lock(&l->lock); 44 sk_del_node_init(sk); 45 write_unlock(&l->lock); 46 } 47 48 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock) 49 { 50 sock->remote_rw = LLCP_DEFAULT_RW; 51 sock->remote_miu = LLCP_MAX_MIU + 1; 52 } 53 54 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) 55 { 56 struct nfc_llcp_local *local = sock->local; 57 struct sk_buff *s, *tmp; 58 59 pr_debug("%p\n", &sock->sk); 60 61 skb_queue_purge(&sock->tx_queue); 62 skb_queue_purge(&sock->tx_pending_queue); 63 64 if (local == NULL) 65 return; 66 67 /* Search for local pending SKBs that are related to this socket */ 68 skb_queue_walk_safe(&local->tx_queue, s, tmp) { 69 if (s->sk != &sock->sk) 70 continue; 71 72 skb_unlink(s, &local->tx_queue); 73 kfree_skb(s); 74 } 75 } 76 77 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device, 78 int err) 79 { 80 struct sock *sk; 81 struct hlist_node *tmp; 82 struct nfc_llcp_sock *llcp_sock; 83 84 skb_queue_purge(&local->tx_queue); 85 86 write_lock(&local->sockets.lock); 87 88 sk_for_each_safe(sk, tmp, &local->sockets.head) { 89 llcp_sock = nfc_llcp_sock(sk); 90 91 bh_lock_sock(sk); 92 93 nfc_llcp_socket_purge(llcp_sock); 94 95 if (sk->sk_state == LLCP_CONNECTED) 96 nfc_put_device(llcp_sock->dev); 97 98 if (sk->sk_state == LLCP_LISTEN) { 99 struct nfc_llcp_sock *lsk, *n; 100 struct sock *accept_sk; 101 102 list_for_each_entry_safe(lsk, n, 103 &llcp_sock->accept_queue, 104 accept_queue) { 105 accept_sk = &lsk->sk; 106 bh_lock_sock(accept_sk); 107 108 nfc_llcp_accept_unlink(accept_sk); 109 110 if (err) 111 accept_sk->sk_err = err; 112 accept_sk->sk_state = LLCP_CLOSED; 113 accept_sk->sk_state_change(sk); 114 115 bh_unlock_sock(accept_sk); 116 } 117 } 118 119 if (err) 120 sk->sk_err = err; 121 sk->sk_state = LLCP_CLOSED; 122 sk->sk_state_change(sk); 123 124 bh_unlock_sock(sk); 125 126 sk_del_node_init(sk); 127 } 128 129 write_unlock(&local->sockets.lock); 130 131 /* If we still have a device, we keep the RAW sockets alive */ 132 if (device == true) 133 return; 134 135 write_lock(&local->raw_sockets.lock); 136 137 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) { 138 llcp_sock = nfc_llcp_sock(sk); 139 140 bh_lock_sock(sk); 141 142 nfc_llcp_socket_purge(llcp_sock); 143 144 if (err) 145 sk->sk_err = err; 146 sk->sk_state = LLCP_CLOSED; 147 sk->sk_state_change(sk); 148 149 bh_unlock_sock(sk); 150 151 sk_del_node_init(sk); 152 } 153 154 write_unlock(&local->raw_sockets.lock); 155 } 156 157 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) 158 { 159 kref_get(&local->ref); 160 161 return local; 162 } 163 164 static void local_cleanup(struct nfc_llcp_local *local) 165 { 166 nfc_llcp_socket_release(local, false, ENXIO); 167 del_timer_sync(&local->link_timer); 168 skb_queue_purge(&local->tx_queue); 169 cancel_work_sync(&local->tx_work); 170 cancel_work_sync(&local->rx_work); 171 cancel_work_sync(&local->timeout_work); 172 kfree_skb(local->rx_pending); 173 del_timer_sync(&local->sdreq_timer); 174 cancel_work_sync(&local->sdreq_timeout_work); 175 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs); 176 } 177 178 static void local_release(struct kref *ref) 179 { 180 struct nfc_llcp_local *local; 181 182 local = container_of(ref, struct nfc_llcp_local, ref); 183 184 list_del(&local->list); 185 local_cleanup(local); 186 kfree(local); 187 } 188 189 int nfc_llcp_local_put(struct nfc_llcp_local *local) 190 { 191 if (local == NULL) 192 return 0; 193 194 return kref_put(&local->ref, local_release); 195 } 196 197 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, 198 u8 ssap, u8 dsap) 199 { 200 struct sock *sk; 201 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 202 203 pr_debug("ssap dsap %d %d\n", ssap, dsap); 204 205 if (ssap == 0 && dsap == 0) 206 return NULL; 207 208 read_lock(&local->sockets.lock); 209 210 llcp_sock = NULL; 211 212 sk_for_each(sk, &local->sockets.head) { 213 tmp_sock = nfc_llcp_sock(sk); 214 215 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { 216 llcp_sock = tmp_sock; 217 break; 218 } 219 } 220 221 read_unlock(&local->sockets.lock); 222 223 if (llcp_sock == NULL) 224 return NULL; 225 226 sock_hold(&llcp_sock->sk); 227 228 return llcp_sock; 229 } 230 231 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 232 { 233 sock_put(&sock->sk); 234 } 235 236 static void nfc_llcp_timeout_work(struct work_struct *work) 237 { 238 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 239 timeout_work); 240 241 nfc_dep_link_down(local->dev); 242 } 243 244 static void nfc_llcp_symm_timer(unsigned long data) 245 { 246 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 247 248 pr_err("SYMM timeout\n"); 249 250 schedule_work(&local->timeout_work); 251 } 252 253 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 254 { 255 unsigned long time; 256 HLIST_HEAD(nl_sdres_list); 257 struct hlist_node *n; 258 struct nfc_llcp_sdp_tlv *sdp; 259 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 260 sdreq_timeout_work); 261 262 mutex_lock(&local->sdreq_lock); 263 264 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 265 266 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 267 if (time_after(sdp->time, time)) 268 continue; 269 270 sdp->sap = LLCP_SDP_UNBOUND; 271 272 hlist_del(&sdp->node); 273 274 hlist_add_head(&sdp->node, &nl_sdres_list); 275 } 276 277 if (!hlist_empty(&local->pending_sdreqs)) 278 mod_timer(&local->sdreq_timer, 279 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 280 281 mutex_unlock(&local->sdreq_lock); 282 283 if (!hlist_empty(&nl_sdres_list)) 284 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 285 } 286 287 static void nfc_llcp_sdreq_timer(unsigned long data) 288 { 289 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 290 291 schedule_work(&local->sdreq_timeout_work); 292 } 293 294 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 295 { 296 struct nfc_llcp_local *local, *n; 297 298 list_for_each_entry_safe(local, n, &llcp_devices, list) 299 if (local->dev == dev) 300 return local; 301 302 pr_debug("No device found\n"); 303 304 return NULL; 305 } 306 307 static char *wks[] = { 308 NULL, 309 NULL, /* SDP */ 310 "urn:nfc:sn:ip", 311 "urn:nfc:sn:obex", 312 "urn:nfc:sn:snep", 313 }; 314 315 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) 316 { 317 int sap, num_wks; 318 319 pr_debug("%s\n", service_name); 320 321 if (service_name == NULL) 322 return -EINVAL; 323 324 num_wks = ARRAY_SIZE(wks); 325 326 for (sap = 0; sap < num_wks; sap++) { 327 if (wks[sap] == NULL) 328 continue; 329 330 if (strncmp(wks[sap], service_name, service_name_len) == 0) 331 return sap; 332 } 333 334 return -EINVAL; 335 } 336 337 static 338 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 339 u8 *sn, size_t sn_len) 340 { 341 struct sock *sk; 342 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 343 344 pr_debug("sn %zd %p\n", sn_len, sn); 345 346 if (sn == NULL || sn_len == 0) 347 return NULL; 348 349 read_lock(&local->sockets.lock); 350 351 llcp_sock = NULL; 352 353 sk_for_each(sk, &local->sockets.head) { 354 tmp_sock = nfc_llcp_sock(sk); 355 356 pr_debug("llcp sock %p\n", tmp_sock); 357 358 if (tmp_sock->sk.sk_type == SOCK_STREAM && 359 tmp_sock->sk.sk_state != LLCP_LISTEN) 360 continue; 361 362 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 363 tmp_sock->sk.sk_state != LLCP_BOUND) 364 continue; 365 366 if (tmp_sock->service_name == NULL || 367 tmp_sock->service_name_len == 0) 368 continue; 369 370 if (tmp_sock->service_name_len != sn_len) 371 continue; 372 373 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 374 llcp_sock = tmp_sock; 375 break; 376 } 377 } 378 379 read_unlock(&local->sockets.lock); 380 381 pr_debug("Found llcp sock %p\n", llcp_sock); 382 383 return llcp_sock; 384 } 385 386 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 387 struct nfc_llcp_sock *sock) 388 { 389 mutex_lock(&local->sdp_lock); 390 391 if (sock->service_name != NULL && sock->service_name_len > 0) { 392 int ssap = nfc_llcp_wks_sap(sock->service_name, 393 sock->service_name_len); 394 395 if (ssap > 0) { 396 pr_debug("WKS %d\n", ssap); 397 398 /* This is a WKS, let's check if it's free */ 399 if (local->local_wks & BIT(ssap)) { 400 mutex_unlock(&local->sdp_lock); 401 402 return LLCP_SAP_MAX; 403 } 404 405 set_bit(ssap, &local->local_wks); 406 mutex_unlock(&local->sdp_lock); 407 408 return ssap; 409 } 410 411 /* 412 * Check if there already is a non WKS socket bound 413 * to this service name. 414 */ 415 if (nfc_llcp_sock_from_sn(local, sock->service_name, 416 sock->service_name_len) != NULL) { 417 mutex_unlock(&local->sdp_lock); 418 419 return LLCP_SAP_MAX; 420 } 421 422 mutex_unlock(&local->sdp_lock); 423 424 return LLCP_SDP_UNBOUND; 425 426 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { 427 if (!test_bit(sock->ssap, &local->local_wks)) { 428 set_bit(sock->ssap, &local->local_wks); 429 mutex_unlock(&local->sdp_lock); 430 431 return sock->ssap; 432 } 433 } 434 435 mutex_unlock(&local->sdp_lock); 436 437 return LLCP_SAP_MAX; 438 } 439 440 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) 441 { 442 u8 local_ssap; 443 444 mutex_lock(&local->sdp_lock); 445 446 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); 447 if (local_ssap == LLCP_LOCAL_NUM_SAP) { 448 mutex_unlock(&local->sdp_lock); 449 return LLCP_SAP_MAX; 450 } 451 452 set_bit(local_ssap, &local->local_sap); 453 454 mutex_unlock(&local->sdp_lock); 455 456 return local_ssap + LLCP_LOCAL_SAP_OFFSET; 457 } 458 459 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) 460 { 461 u8 local_ssap; 462 unsigned long *sdp; 463 464 if (ssap < LLCP_WKS_NUM_SAP) { 465 local_ssap = ssap; 466 sdp = &local->local_wks; 467 } else if (ssap < LLCP_LOCAL_NUM_SAP) { 468 atomic_t *client_cnt; 469 470 local_ssap = ssap - LLCP_WKS_NUM_SAP; 471 sdp = &local->local_sdp; 472 client_cnt = &local->local_sdp_cnt[local_ssap]; 473 474 pr_debug("%d clients\n", atomic_read(client_cnt)); 475 476 mutex_lock(&local->sdp_lock); 477 478 if (atomic_dec_and_test(client_cnt)) { 479 struct nfc_llcp_sock *l_sock; 480 481 pr_debug("No more clients for SAP %d\n", ssap); 482 483 clear_bit(local_ssap, sdp); 484 485 /* Find the listening sock and set it back to UNBOUND */ 486 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); 487 if (l_sock) { 488 l_sock->ssap = LLCP_SDP_UNBOUND; 489 nfc_llcp_sock_put(l_sock); 490 } 491 } 492 493 mutex_unlock(&local->sdp_lock); 494 495 return; 496 } else if (ssap < LLCP_MAX_SAP) { 497 local_ssap = ssap - LLCP_LOCAL_NUM_SAP; 498 sdp = &local->local_sap; 499 } else { 500 return; 501 } 502 503 mutex_lock(&local->sdp_lock); 504 505 clear_bit(local_ssap, sdp); 506 507 mutex_unlock(&local->sdp_lock); 508 } 509 510 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) 511 { 512 u8 ssap; 513 514 mutex_lock(&local->sdp_lock); 515 516 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); 517 if (ssap == LLCP_SDP_NUM_SAP) { 518 mutex_unlock(&local->sdp_lock); 519 520 return LLCP_SAP_MAX; 521 } 522 523 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); 524 525 set_bit(ssap, &local->local_sdp); 526 527 mutex_unlock(&local->sdp_lock); 528 529 return LLCP_WKS_NUM_SAP + ssap; 530 } 531 532 static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 533 { 534 u8 *gb_cur, *version_tlv, version, version_length; 535 u8 *lto_tlv, lto_length; 536 u8 *wks_tlv, wks_length; 537 u8 *miux_tlv, miux_length; 538 __be16 wks = cpu_to_be16(local->local_wks); 539 u8 gb_len = 0; 540 int ret = 0; 541 542 version = LLCP_VERSION_11; 543 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, 544 1, &version_length); 545 gb_len += version_length; 546 547 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 548 gb_len += lto_length; 549 550 pr_debug("Local wks 0x%lx\n", local->local_wks); 551 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); 552 gb_len += wks_length; 553 554 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 555 &miux_length); 556 gb_len += miux_length; 557 558 gb_len += ARRAY_SIZE(llcp_magic); 559 560 if (gb_len > NFC_MAX_GT_LEN) { 561 ret = -EINVAL; 562 goto out; 563 } 564 565 gb_cur = local->gb; 566 567 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 568 gb_cur += ARRAY_SIZE(llcp_magic); 569 570 memcpy(gb_cur, version_tlv, version_length); 571 gb_cur += version_length; 572 573 memcpy(gb_cur, lto_tlv, lto_length); 574 gb_cur += lto_length; 575 576 memcpy(gb_cur, wks_tlv, wks_length); 577 gb_cur += wks_length; 578 579 memcpy(gb_cur, miux_tlv, miux_length); 580 gb_cur += miux_length; 581 582 local->gb_len = gb_len; 583 584 out: 585 kfree(version_tlv); 586 kfree(lto_tlv); 587 kfree(wks_tlv); 588 kfree(miux_tlv); 589 590 return ret; 591 } 592 593 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 594 { 595 struct nfc_llcp_local *local; 596 597 local = nfc_llcp_find_local(dev); 598 if (local == NULL) { 599 *general_bytes_len = 0; 600 return NULL; 601 } 602 603 nfc_llcp_build_gb(local); 604 605 *general_bytes_len = local->gb_len; 606 607 return local->gb; 608 } 609 610 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) 611 { 612 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 613 614 if (local == NULL) { 615 pr_err("No LLCP device\n"); 616 return -ENODEV; 617 } 618 if (gb_len < 3) 619 return -EINVAL; 620 621 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 622 memcpy(local->remote_gb, gb, gb_len); 623 local->remote_gb_len = gb_len; 624 625 if (memcmp(local->remote_gb, llcp_magic, 3)) { 626 pr_err("MAC does not support LLCP\n"); 627 return -EINVAL; 628 } 629 630 return nfc_llcp_parse_gb_tlv(local, 631 &local->remote_gb[3], 632 local->remote_gb_len - 3); 633 } 634 635 static u8 nfc_llcp_dsap(struct sk_buff *pdu) 636 { 637 return (pdu->data[0] & 0xfc) >> 2; 638 } 639 640 static u8 nfc_llcp_ptype(struct sk_buff *pdu) 641 { 642 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 643 } 644 645 static u8 nfc_llcp_ssap(struct sk_buff *pdu) 646 { 647 return pdu->data[1] & 0x3f; 648 } 649 650 static u8 nfc_llcp_ns(struct sk_buff *pdu) 651 { 652 return pdu->data[2] >> 4; 653 } 654 655 static u8 nfc_llcp_nr(struct sk_buff *pdu) 656 { 657 return pdu->data[2] & 0xf; 658 } 659 660 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 661 { 662 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 663 sock->send_n = (sock->send_n + 1) % 16; 664 sock->recv_ack_n = (sock->recv_n - 1) % 16; 665 } 666 667 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 668 struct sk_buff *skb, u8 direction) 669 { 670 struct sk_buff *skb_copy = NULL, *nskb; 671 struct sock *sk; 672 u8 *data; 673 674 read_lock(&local->raw_sockets.lock); 675 676 sk_for_each(sk, &local->raw_sockets.head) { 677 if (sk->sk_state != LLCP_BOUND) 678 continue; 679 680 if (skb_copy == NULL) { 681 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, 682 GFP_ATOMIC); 683 684 if (skb_copy == NULL) 685 continue; 686 687 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); 688 689 data[0] = local->dev ? local->dev->idx : 0xFF; 690 data[1] = direction; 691 } 692 693 nskb = skb_clone(skb_copy, GFP_ATOMIC); 694 if (!nskb) 695 continue; 696 697 if (sock_queue_rcv_skb(sk, nskb)) 698 kfree_skb(nskb); 699 } 700 701 read_unlock(&local->raw_sockets.lock); 702 703 kfree_skb(skb_copy); 704 } 705 706 static void nfc_llcp_tx_work(struct work_struct *work) 707 { 708 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 709 tx_work); 710 struct sk_buff *skb; 711 struct sock *sk; 712 struct nfc_llcp_sock *llcp_sock; 713 714 skb = skb_dequeue(&local->tx_queue); 715 if (skb != NULL) { 716 sk = skb->sk; 717 llcp_sock = nfc_llcp_sock(sk); 718 719 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 720 kfree_skb(skb); 721 nfc_llcp_send_symm(local->dev); 722 } else if (llcp_sock && !llcp_sock->remote_ready) { 723 skb_queue_head(&local->tx_queue, skb); 724 nfc_llcp_send_symm(local->dev); 725 } else { 726 struct sk_buff *copy_skb = NULL; 727 u8 ptype = nfc_llcp_ptype(skb); 728 int ret; 729 730 pr_debug("Sending pending skb\n"); 731 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", 732 DUMP_PREFIX_OFFSET, 16, 1, 733 skb->data, skb->len, true); 734 735 if (ptype == LLCP_PDU_DISC && sk != NULL && 736 sk->sk_state == LLCP_DISCONNECTING) { 737 nfc_llcp_sock_unlink(&local->sockets, sk); 738 sock_orphan(sk); 739 sock_put(sk); 740 } 741 742 if (ptype == LLCP_PDU_I) 743 copy_skb = skb_copy(skb, GFP_ATOMIC); 744 745 __net_timestamp(skb); 746 747 nfc_llcp_send_to_raw_sock(local, skb, 748 NFC_LLCP_DIRECTION_TX); 749 750 ret = nfc_data_exchange(local->dev, local->target_idx, 751 skb, nfc_llcp_recv, local); 752 753 if (ret) { 754 kfree_skb(copy_skb); 755 goto out; 756 } 757 758 if (ptype == LLCP_PDU_I && copy_skb) 759 skb_queue_tail(&llcp_sock->tx_pending_queue, 760 copy_skb); 761 } 762 } else { 763 nfc_llcp_send_symm(local->dev); 764 } 765 766 out: 767 mod_timer(&local->link_timer, 768 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 769 } 770 771 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 772 u8 ssap) 773 { 774 struct sock *sk; 775 struct nfc_llcp_sock *llcp_sock; 776 777 read_lock(&local->connecting_sockets.lock); 778 779 sk_for_each(sk, &local->connecting_sockets.head) { 780 llcp_sock = nfc_llcp_sock(sk); 781 782 if (llcp_sock->ssap == ssap) { 783 sock_hold(&llcp_sock->sk); 784 goto out; 785 } 786 } 787 788 llcp_sock = NULL; 789 790 out: 791 read_unlock(&local->connecting_sockets.lock); 792 793 return llcp_sock; 794 } 795 796 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 797 u8 *sn, size_t sn_len) 798 { 799 struct nfc_llcp_sock *llcp_sock; 800 801 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); 802 803 if (llcp_sock == NULL) 804 return NULL; 805 806 sock_hold(&llcp_sock->sk); 807 808 return llcp_sock; 809 } 810 811 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 812 { 813 u8 *tlv = &skb->data[2], type, length; 814 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 815 816 while (offset < tlv_array_len) { 817 type = tlv[0]; 818 length = tlv[1]; 819 820 pr_debug("type 0x%x length %d\n", type, length); 821 822 if (type == LLCP_TLV_SN) { 823 *sn_len = length; 824 return &tlv[2]; 825 } 826 827 offset += length + 2; 828 tlv += length + 2; 829 } 830 831 return NULL; 832 } 833 834 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 835 struct sk_buff *skb) 836 { 837 struct nfc_llcp_sock *llcp_sock; 838 struct nfc_llcp_ui_cb *ui_cb; 839 u8 dsap, ssap; 840 841 dsap = nfc_llcp_dsap(skb); 842 ssap = nfc_llcp_ssap(skb); 843 844 ui_cb = nfc_llcp_ui_skb_cb(skb); 845 ui_cb->dsap = dsap; 846 ui_cb->ssap = ssap; 847 848 pr_debug("%d %d\n", dsap, ssap); 849 850 /* We're looking for a bound socket, not a client one */ 851 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 852 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 853 return; 854 855 /* There is no sequence with UI frames */ 856 skb_pull(skb, LLCP_HEADER_SIZE); 857 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 858 /* 859 * UI frames will be freed from the socket layer, so we 860 * need to keep them alive until someone receives them. 861 */ 862 skb_get(skb); 863 } else { 864 pr_err("Receive queue is full\n"); 865 } 866 867 nfc_llcp_sock_put(llcp_sock); 868 } 869 870 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 871 struct sk_buff *skb) 872 { 873 struct sock *new_sk, *parent; 874 struct nfc_llcp_sock *sock, *new_sock; 875 u8 dsap, ssap, reason; 876 877 dsap = nfc_llcp_dsap(skb); 878 ssap = nfc_llcp_ssap(skb); 879 880 pr_debug("%d %d\n", dsap, ssap); 881 882 if (dsap != LLCP_SAP_SDP) { 883 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 884 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 885 reason = LLCP_DM_NOBOUND; 886 goto fail; 887 } 888 } else { 889 u8 *sn; 890 size_t sn_len; 891 892 sn = nfc_llcp_connect_sn(skb, &sn_len); 893 if (sn == NULL) { 894 reason = LLCP_DM_NOBOUND; 895 goto fail; 896 } 897 898 pr_debug("Service name length %zu\n", sn_len); 899 900 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 901 if (sock == NULL) { 902 reason = LLCP_DM_NOBOUND; 903 goto fail; 904 } 905 } 906 907 lock_sock(&sock->sk); 908 909 parent = &sock->sk; 910 911 if (sk_acceptq_is_full(parent)) { 912 reason = LLCP_DM_REJ; 913 release_sock(&sock->sk); 914 sock_put(&sock->sk); 915 goto fail; 916 } 917 918 if (sock->ssap == LLCP_SDP_UNBOUND) { 919 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 920 921 pr_debug("First client, reserving %d\n", ssap); 922 923 if (ssap == LLCP_SAP_MAX) { 924 reason = LLCP_DM_REJ; 925 release_sock(&sock->sk); 926 sock_put(&sock->sk); 927 goto fail; 928 } 929 930 sock->ssap = ssap; 931 } 932 933 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); 934 if (new_sk == NULL) { 935 reason = LLCP_DM_REJ; 936 release_sock(&sock->sk); 937 sock_put(&sock->sk); 938 goto fail; 939 } 940 941 new_sock = nfc_llcp_sock(new_sk); 942 new_sock->dev = local->dev; 943 new_sock->local = nfc_llcp_local_get(local); 944 new_sock->rw = sock->rw; 945 new_sock->miux = sock->miux; 946 new_sock->nfc_protocol = sock->nfc_protocol; 947 new_sock->dsap = ssap; 948 new_sock->target_idx = local->target_idx; 949 new_sock->parent = parent; 950 new_sock->ssap = sock->ssap; 951 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 952 atomic_t *client_count; 953 954 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 955 956 client_count = 957 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 958 959 atomic_inc(client_count); 960 new_sock->reserved_ssap = sock->ssap; 961 } 962 963 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 964 skb->len - LLCP_HEADER_SIZE); 965 966 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 967 968 nfc_llcp_sock_link(&local->sockets, new_sk); 969 970 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 971 972 nfc_get_device(local->dev->idx); 973 974 new_sk->sk_state = LLCP_CONNECTED; 975 976 /* Wake the listening processes */ 977 parent->sk_data_ready(parent, 0); 978 979 /* Send CC */ 980 nfc_llcp_send_cc(new_sock); 981 982 release_sock(&sock->sk); 983 sock_put(&sock->sk); 984 985 return; 986 987 fail: 988 /* Send DM */ 989 nfc_llcp_send_dm(local, dsap, ssap, reason); 990 } 991 992 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 993 { 994 int nr_frames = 0; 995 struct nfc_llcp_local *local = sock->local; 996 997 pr_debug("Remote ready %d tx queue len %d remote rw %d", 998 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 999 sock->remote_rw); 1000 1001 /* Try to queue some I frames for transmission */ 1002 while (sock->remote_ready && 1003 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1004 struct sk_buff *pdu; 1005 1006 pdu = skb_dequeue(&sock->tx_queue); 1007 if (pdu == NULL) 1008 break; 1009 1010 /* Update N(S)/N(R) */ 1011 nfc_llcp_set_nrns(sock, pdu); 1012 1013 skb_queue_tail(&local->tx_queue, pdu); 1014 nr_frames++; 1015 } 1016 1017 return nr_frames; 1018 } 1019 1020 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1021 struct sk_buff *skb) 1022 { 1023 struct nfc_llcp_sock *llcp_sock; 1024 struct sock *sk; 1025 u8 dsap, ssap, ptype, ns, nr; 1026 1027 ptype = nfc_llcp_ptype(skb); 1028 dsap = nfc_llcp_dsap(skb); 1029 ssap = nfc_llcp_ssap(skb); 1030 ns = nfc_llcp_ns(skb); 1031 nr = nfc_llcp_nr(skb); 1032 1033 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1034 1035 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1036 if (llcp_sock == NULL) { 1037 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1038 return; 1039 } 1040 1041 sk = &llcp_sock->sk; 1042 lock_sock(sk); 1043 if (sk->sk_state == LLCP_CLOSED) { 1044 release_sock(sk); 1045 nfc_llcp_sock_put(llcp_sock); 1046 } 1047 1048 /* Pass the payload upstream */ 1049 if (ptype == LLCP_PDU_I) { 1050 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1051 1052 if (ns == llcp_sock->recv_n) 1053 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1054 else 1055 pr_err("Received out of sequence I PDU\n"); 1056 1057 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1058 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1059 /* 1060 * I frames will be freed from the socket layer, so we 1061 * need to keep them alive until someone receives them. 1062 */ 1063 skb_get(skb); 1064 } else { 1065 pr_err("Receive queue is full\n"); 1066 } 1067 } 1068 1069 /* Remove skbs from the pending queue */ 1070 if (llcp_sock->send_ack_n != nr) { 1071 struct sk_buff *s, *tmp; 1072 u8 n; 1073 1074 llcp_sock->send_ack_n = nr; 1075 1076 /* Remove and free all skbs until ns == nr */ 1077 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1078 n = nfc_llcp_ns(s); 1079 1080 skb_unlink(s, &llcp_sock->tx_pending_queue); 1081 kfree_skb(s); 1082 1083 if (n == nr) 1084 break; 1085 } 1086 1087 /* Re-queue the remaining skbs for transmission */ 1088 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1089 s, tmp) { 1090 skb_unlink(s, &llcp_sock->tx_pending_queue); 1091 skb_queue_head(&local->tx_queue, s); 1092 } 1093 } 1094 1095 if (ptype == LLCP_PDU_RR) 1096 llcp_sock->remote_ready = true; 1097 else if (ptype == LLCP_PDU_RNR) 1098 llcp_sock->remote_ready = false; 1099 1100 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1101 nfc_llcp_send_rr(llcp_sock); 1102 1103 release_sock(sk); 1104 nfc_llcp_sock_put(llcp_sock); 1105 } 1106 1107 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1108 struct sk_buff *skb) 1109 { 1110 struct nfc_llcp_sock *llcp_sock; 1111 struct sock *sk; 1112 u8 dsap, ssap; 1113 1114 dsap = nfc_llcp_dsap(skb); 1115 ssap = nfc_llcp_ssap(skb); 1116 1117 if ((dsap == 0) && (ssap == 0)) { 1118 pr_debug("Connection termination"); 1119 nfc_dep_link_down(local->dev); 1120 return; 1121 } 1122 1123 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1124 if (llcp_sock == NULL) { 1125 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1126 return; 1127 } 1128 1129 sk = &llcp_sock->sk; 1130 lock_sock(sk); 1131 1132 nfc_llcp_socket_purge(llcp_sock); 1133 1134 if (sk->sk_state == LLCP_CLOSED) { 1135 release_sock(sk); 1136 nfc_llcp_sock_put(llcp_sock); 1137 } 1138 1139 if (sk->sk_state == LLCP_CONNECTED) { 1140 nfc_put_device(local->dev); 1141 sk->sk_state = LLCP_CLOSED; 1142 sk->sk_state_change(sk); 1143 } 1144 1145 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1146 1147 release_sock(sk); 1148 nfc_llcp_sock_put(llcp_sock); 1149 } 1150 1151 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) 1152 { 1153 struct nfc_llcp_sock *llcp_sock; 1154 struct sock *sk; 1155 u8 dsap, ssap; 1156 1157 dsap = nfc_llcp_dsap(skb); 1158 ssap = nfc_llcp_ssap(skb); 1159 1160 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1161 if (llcp_sock == NULL) { 1162 pr_err("Invalid CC\n"); 1163 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1164 1165 return; 1166 } 1167 1168 sk = &llcp_sock->sk; 1169 1170 /* Unlink from connecting and link to the client array */ 1171 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1172 nfc_llcp_sock_link(&local->sockets, sk); 1173 llcp_sock->dsap = ssap; 1174 1175 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1176 skb->len - LLCP_HEADER_SIZE); 1177 1178 sk->sk_state = LLCP_CONNECTED; 1179 sk->sk_state_change(sk); 1180 1181 nfc_llcp_sock_put(llcp_sock); 1182 } 1183 1184 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) 1185 { 1186 struct nfc_llcp_sock *llcp_sock; 1187 struct sock *sk; 1188 u8 dsap, ssap, reason; 1189 1190 dsap = nfc_llcp_dsap(skb); 1191 ssap = nfc_llcp_ssap(skb); 1192 reason = skb->data[2]; 1193 1194 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1195 1196 switch (reason) { 1197 case LLCP_DM_NOBOUND: 1198 case LLCP_DM_REJ: 1199 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1200 break; 1201 1202 default: 1203 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1204 break; 1205 } 1206 1207 if (llcp_sock == NULL) { 1208 pr_debug("Already closed\n"); 1209 return; 1210 } 1211 1212 sk = &llcp_sock->sk; 1213 1214 sk->sk_err = ENXIO; 1215 sk->sk_state = LLCP_CLOSED; 1216 sk->sk_state_change(sk); 1217 1218 nfc_llcp_sock_put(llcp_sock); 1219 } 1220 1221 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1222 struct sk_buff *skb) 1223 { 1224 struct nfc_llcp_sock *llcp_sock; 1225 u8 dsap, ssap, *tlv, type, length, tid, sap; 1226 u16 tlv_len, offset; 1227 char *service_name; 1228 size_t service_name_len; 1229 struct nfc_llcp_sdp_tlv *sdp; 1230 HLIST_HEAD(llc_sdres_list); 1231 size_t sdres_tlvs_len; 1232 HLIST_HEAD(nl_sdres_list); 1233 1234 dsap = nfc_llcp_dsap(skb); 1235 ssap = nfc_llcp_ssap(skb); 1236 1237 pr_debug("%d %d\n", dsap, ssap); 1238 1239 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1240 pr_err("Wrong SNL SAP\n"); 1241 return; 1242 } 1243 1244 tlv = &skb->data[LLCP_HEADER_SIZE]; 1245 tlv_len = skb->len - LLCP_HEADER_SIZE; 1246 offset = 0; 1247 sdres_tlvs_len = 0; 1248 1249 while (offset < tlv_len) { 1250 type = tlv[0]; 1251 length = tlv[1]; 1252 1253 switch (type) { 1254 case LLCP_TLV_SDREQ: 1255 tid = tlv[2]; 1256 service_name = (char *) &tlv[3]; 1257 service_name_len = length - 1; 1258 1259 pr_debug("Looking for %.16s\n", service_name); 1260 1261 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1262 !strncmp(service_name, "urn:nfc:sn:sdp", 1263 service_name_len)) { 1264 sap = 1; 1265 goto add_snl; 1266 } 1267 1268 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1269 service_name_len); 1270 if (!llcp_sock) { 1271 sap = 0; 1272 goto add_snl; 1273 } 1274 1275 /* 1276 * We found a socket but its ssap has not been reserved 1277 * yet. We need to assign it for good and send a reply. 1278 * The ssap will be freed when the socket is closed. 1279 */ 1280 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1281 atomic_t *client_count; 1282 1283 sap = nfc_llcp_reserve_sdp_ssap(local); 1284 1285 pr_debug("Reserving %d\n", sap); 1286 1287 if (sap == LLCP_SAP_MAX) { 1288 sap = 0; 1289 goto add_snl; 1290 } 1291 1292 client_count = 1293 &local->local_sdp_cnt[sap - 1294 LLCP_WKS_NUM_SAP]; 1295 1296 atomic_inc(client_count); 1297 1298 llcp_sock->ssap = sap; 1299 llcp_sock->reserved_ssap = sap; 1300 } else { 1301 sap = llcp_sock->ssap; 1302 } 1303 1304 pr_debug("%p %d\n", llcp_sock, sap); 1305 1306 add_snl: 1307 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1308 if (sdp == NULL) 1309 goto exit; 1310 1311 sdres_tlvs_len += sdp->tlv_len; 1312 hlist_add_head(&sdp->node, &llc_sdres_list); 1313 break; 1314 1315 case LLCP_TLV_SDRES: 1316 mutex_lock(&local->sdreq_lock); 1317 1318 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1319 1320 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1321 if (sdp->tid != tlv[2]) 1322 continue; 1323 1324 sdp->sap = tlv[3]; 1325 1326 pr_debug("Found: uri=%s, sap=%d\n", 1327 sdp->uri, sdp->sap); 1328 1329 hlist_del(&sdp->node); 1330 1331 hlist_add_head(&sdp->node, &nl_sdres_list); 1332 1333 break; 1334 } 1335 1336 mutex_unlock(&local->sdreq_lock); 1337 break; 1338 1339 default: 1340 pr_err("Invalid SNL tlv value 0x%x\n", type); 1341 break; 1342 } 1343 1344 offset += length + 2; 1345 tlv += length + 2; 1346 } 1347 1348 exit: 1349 if (!hlist_empty(&nl_sdres_list)) 1350 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1351 1352 if (!hlist_empty(&llc_sdres_list)) 1353 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1354 } 1355 1356 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1357 { 1358 u8 ptype; 1359 u16 pdu_len; 1360 struct sk_buff *new_skb; 1361 1362 if (skb->len <= LLCP_HEADER_SIZE) { 1363 pr_err("Malformed AGF PDU\n"); 1364 return; 1365 } 1366 1367 skb_pull(skb, LLCP_HEADER_SIZE); 1368 1369 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1370 pdu_len = skb->data[0] << 8 | skb->data[1]; 1371 1372 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1373 1374 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1375 pr_err("Malformed AGF PDU\n"); 1376 return; 1377 } 1378 1379 ptype = nfc_llcp_ptype(skb); 1380 1381 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1382 goto next; 1383 1384 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1385 if (new_skb == NULL) { 1386 pr_err("Could not allocate PDU\n"); 1387 return; 1388 } 1389 1390 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len); 1391 1392 nfc_llcp_rx_skb(local, new_skb); 1393 1394 kfree_skb(new_skb); 1395 next: 1396 skb_pull(skb, pdu_len); 1397 } 1398 } 1399 1400 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1401 { 1402 u8 dsap, ssap, ptype; 1403 1404 ptype = nfc_llcp_ptype(skb); 1405 dsap = nfc_llcp_dsap(skb); 1406 ssap = nfc_llcp_ssap(skb); 1407 1408 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1409 1410 if (ptype != LLCP_PDU_SYMM) 1411 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, 1412 16, 1, skb->data, skb->len, true); 1413 1414 switch (ptype) { 1415 case LLCP_PDU_SYMM: 1416 pr_debug("SYMM\n"); 1417 break; 1418 1419 case LLCP_PDU_UI: 1420 pr_debug("UI\n"); 1421 nfc_llcp_recv_ui(local, skb); 1422 break; 1423 1424 case LLCP_PDU_CONNECT: 1425 pr_debug("CONNECT\n"); 1426 nfc_llcp_recv_connect(local, skb); 1427 break; 1428 1429 case LLCP_PDU_DISC: 1430 pr_debug("DISC\n"); 1431 nfc_llcp_recv_disc(local, skb); 1432 break; 1433 1434 case LLCP_PDU_CC: 1435 pr_debug("CC\n"); 1436 nfc_llcp_recv_cc(local, skb); 1437 break; 1438 1439 case LLCP_PDU_DM: 1440 pr_debug("DM\n"); 1441 nfc_llcp_recv_dm(local, skb); 1442 break; 1443 1444 case LLCP_PDU_SNL: 1445 pr_debug("SNL\n"); 1446 nfc_llcp_recv_snl(local, skb); 1447 break; 1448 1449 case LLCP_PDU_I: 1450 case LLCP_PDU_RR: 1451 case LLCP_PDU_RNR: 1452 pr_debug("I frame\n"); 1453 nfc_llcp_recv_hdlc(local, skb); 1454 break; 1455 1456 case LLCP_PDU_AGF: 1457 pr_debug("AGF frame\n"); 1458 nfc_llcp_recv_agf(local, skb); 1459 break; 1460 } 1461 } 1462 1463 static void nfc_llcp_rx_work(struct work_struct *work) 1464 { 1465 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1466 rx_work); 1467 struct sk_buff *skb; 1468 1469 skb = local->rx_pending; 1470 if (skb == NULL) { 1471 pr_debug("No pending SKB\n"); 1472 return; 1473 } 1474 1475 __net_timestamp(skb); 1476 1477 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); 1478 1479 nfc_llcp_rx_skb(local, skb); 1480 1481 schedule_work(&local->tx_work); 1482 kfree_skb(local->rx_pending); 1483 local->rx_pending = NULL; 1484 } 1485 1486 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1487 { 1488 local->rx_pending = skb; 1489 del_timer(&local->link_timer); 1490 schedule_work(&local->rx_work); 1491 } 1492 1493 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1494 { 1495 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1496 1497 pr_debug("Received an LLCP PDU\n"); 1498 if (err < 0) { 1499 pr_err("err %d\n", err); 1500 return; 1501 } 1502 1503 __nfc_llcp_recv(local, skb); 1504 } 1505 1506 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1507 { 1508 struct nfc_llcp_local *local; 1509 1510 local = nfc_llcp_find_local(dev); 1511 if (local == NULL) 1512 return -ENODEV; 1513 1514 __nfc_llcp_recv(local, skb); 1515 1516 return 0; 1517 } 1518 1519 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1520 { 1521 struct nfc_llcp_local *local; 1522 1523 local = nfc_llcp_find_local(dev); 1524 if (local == NULL) 1525 return; 1526 1527 local->remote_miu = LLCP_DEFAULT_MIU; 1528 local->remote_lto = LLCP_DEFAULT_LTO; 1529 1530 /* Close and purge all existing sockets */ 1531 nfc_llcp_socket_release(local, true, 0); 1532 } 1533 1534 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1535 u8 comm_mode, u8 rf_mode) 1536 { 1537 struct nfc_llcp_local *local; 1538 1539 pr_debug("rf mode %d\n", rf_mode); 1540 1541 local = nfc_llcp_find_local(dev); 1542 if (local == NULL) 1543 return; 1544 1545 local->target_idx = target_idx; 1546 local->comm_mode = comm_mode; 1547 local->rf_mode = rf_mode; 1548 1549 if (rf_mode == NFC_RF_INITIATOR) { 1550 pr_debug("Queueing Tx work\n"); 1551 1552 schedule_work(&local->tx_work); 1553 } else { 1554 mod_timer(&local->link_timer, 1555 jiffies + msecs_to_jiffies(local->remote_lto)); 1556 } 1557 } 1558 1559 int nfc_llcp_register_device(struct nfc_dev *ndev) 1560 { 1561 struct nfc_llcp_local *local; 1562 1563 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1564 if (local == NULL) 1565 return -ENOMEM; 1566 1567 local->dev = ndev; 1568 INIT_LIST_HEAD(&local->list); 1569 kref_init(&local->ref); 1570 mutex_init(&local->sdp_lock); 1571 init_timer(&local->link_timer); 1572 local->link_timer.data = (unsigned long) local; 1573 local->link_timer.function = nfc_llcp_symm_timer; 1574 1575 skb_queue_head_init(&local->tx_queue); 1576 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1577 1578 local->rx_pending = NULL; 1579 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1580 1581 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1582 1583 rwlock_init(&local->sockets.lock); 1584 rwlock_init(&local->connecting_sockets.lock); 1585 rwlock_init(&local->raw_sockets.lock); 1586 1587 local->lto = 150; /* 1500 ms */ 1588 local->rw = LLCP_MAX_RW; 1589 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1590 local->local_wks = 0x1; /* LLC Link Management */ 1591 1592 nfc_llcp_build_gb(local); 1593 1594 local->remote_miu = LLCP_DEFAULT_MIU; 1595 local->remote_lto = LLCP_DEFAULT_LTO; 1596 1597 mutex_init(&local->sdreq_lock); 1598 INIT_HLIST_HEAD(&local->pending_sdreqs); 1599 init_timer(&local->sdreq_timer); 1600 local->sdreq_timer.data = (unsigned long) local; 1601 local->sdreq_timer.function = nfc_llcp_sdreq_timer; 1602 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1603 1604 list_add(&local->list, &llcp_devices); 1605 1606 return 0; 1607 } 1608 1609 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1610 { 1611 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 1612 1613 if (local == NULL) { 1614 pr_debug("No such device\n"); 1615 return; 1616 } 1617 1618 local_cleanup(local); 1619 1620 nfc_llcp_local_put(local); 1621 } 1622 1623 int __init nfc_llcp_init(void) 1624 { 1625 INIT_LIST_HEAD(&llcp_devices); 1626 1627 return nfc_llcp_sock_init(); 1628 } 1629 1630 void nfc_llcp_exit(void) 1631 { 1632 nfc_llcp_sock_exit(); 1633 } 1634