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 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; 297 298 list_for_each_entry(local, &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; 613 614 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) 615 return -EINVAL; 616 617 local = nfc_llcp_find_local(dev); 618 if (local == NULL) { 619 pr_err("No LLCP device\n"); 620 return -ENODEV; 621 } 622 623 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 624 memcpy(local->remote_gb, gb, gb_len); 625 local->remote_gb_len = gb_len; 626 627 if (memcmp(local->remote_gb, llcp_magic, 3)) { 628 pr_err("MAC does not support LLCP\n"); 629 return -EINVAL; 630 } 631 632 return nfc_llcp_parse_gb_tlv(local, 633 &local->remote_gb[3], 634 local->remote_gb_len - 3); 635 } 636 637 static u8 nfc_llcp_dsap(struct sk_buff *pdu) 638 { 639 return (pdu->data[0] & 0xfc) >> 2; 640 } 641 642 static u8 nfc_llcp_ptype(struct sk_buff *pdu) 643 { 644 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 645 } 646 647 static u8 nfc_llcp_ssap(struct sk_buff *pdu) 648 { 649 return pdu->data[1] & 0x3f; 650 } 651 652 static u8 nfc_llcp_ns(struct sk_buff *pdu) 653 { 654 return pdu->data[2] >> 4; 655 } 656 657 static u8 nfc_llcp_nr(struct sk_buff *pdu) 658 { 659 return pdu->data[2] & 0xf; 660 } 661 662 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 663 { 664 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 665 sock->send_n = (sock->send_n + 1) % 16; 666 sock->recv_ack_n = (sock->recv_n - 1) % 16; 667 } 668 669 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 670 struct sk_buff *skb, u8 direction) 671 { 672 struct sk_buff *skb_copy = NULL, *nskb; 673 struct sock *sk; 674 u8 *data; 675 676 read_lock(&local->raw_sockets.lock); 677 678 sk_for_each(sk, &local->raw_sockets.head) { 679 if (sk->sk_state != LLCP_BOUND) 680 continue; 681 682 if (skb_copy == NULL) { 683 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, 684 GFP_ATOMIC); 685 686 if (skb_copy == NULL) 687 continue; 688 689 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); 690 691 data[0] = local->dev ? local->dev->idx : 0xFF; 692 data[1] = direction; 693 } 694 695 nskb = skb_clone(skb_copy, GFP_ATOMIC); 696 if (!nskb) 697 continue; 698 699 if (sock_queue_rcv_skb(sk, nskb)) 700 kfree_skb(nskb); 701 } 702 703 read_unlock(&local->raw_sockets.lock); 704 705 kfree_skb(skb_copy); 706 } 707 708 static void nfc_llcp_tx_work(struct work_struct *work) 709 { 710 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 711 tx_work); 712 struct sk_buff *skb; 713 struct sock *sk; 714 struct nfc_llcp_sock *llcp_sock; 715 716 skb = skb_dequeue(&local->tx_queue); 717 if (skb != NULL) { 718 sk = skb->sk; 719 llcp_sock = nfc_llcp_sock(sk); 720 721 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 722 kfree_skb(skb); 723 nfc_llcp_send_symm(local->dev); 724 } else if (llcp_sock && !llcp_sock->remote_ready) { 725 skb_queue_head(&local->tx_queue, skb); 726 nfc_llcp_send_symm(local->dev); 727 } else { 728 struct sk_buff *copy_skb = NULL; 729 u8 ptype = nfc_llcp_ptype(skb); 730 int ret; 731 732 pr_debug("Sending pending skb\n"); 733 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", 734 DUMP_PREFIX_OFFSET, 16, 1, 735 skb->data, skb->len, true); 736 737 if (ptype == LLCP_PDU_DISC && sk != NULL && 738 sk->sk_state == LLCP_DISCONNECTING) { 739 nfc_llcp_sock_unlink(&local->sockets, sk); 740 sock_orphan(sk); 741 sock_put(sk); 742 } 743 744 if (ptype == LLCP_PDU_I) 745 copy_skb = skb_copy(skb, GFP_ATOMIC); 746 747 __net_timestamp(skb); 748 749 nfc_llcp_send_to_raw_sock(local, skb, 750 NFC_LLCP_DIRECTION_TX); 751 752 ret = nfc_data_exchange(local->dev, local->target_idx, 753 skb, nfc_llcp_recv, local); 754 755 if (ret) { 756 kfree_skb(copy_skb); 757 goto out; 758 } 759 760 if (ptype == LLCP_PDU_I && copy_skb) 761 skb_queue_tail(&llcp_sock->tx_pending_queue, 762 copy_skb); 763 } 764 } else { 765 nfc_llcp_send_symm(local->dev); 766 } 767 768 out: 769 mod_timer(&local->link_timer, 770 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 771 } 772 773 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 774 u8 ssap) 775 { 776 struct sock *sk; 777 struct nfc_llcp_sock *llcp_sock; 778 779 read_lock(&local->connecting_sockets.lock); 780 781 sk_for_each(sk, &local->connecting_sockets.head) { 782 llcp_sock = nfc_llcp_sock(sk); 783 784 if (llcp_sock->ssap == ssap) { 785 sock_hold(&llcp_sock->sk); 786 goto out; 787 } 788 } 789 790 llcp_sock = NULL; 791 792 out: 793 read_unlock(&local->connecting_sockets.lock); 794 795 return llcp_sock; 796 } 797 798 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 799 u8 *sn, size_t sn_len) 800 { 801 struct nfc_llcp_sock *llcp_sock; 802 803 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); 804 805 if (llcp_sock == NULL) 806 return NULL; 807 808 sock_hold(&llcp_sock->sk); 809 810 return llcp_sock; 811 } 812 813 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 814 { 815 u8 *tlv = &skb->data[2], type, length; 816 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 817 818 while (offset < tlv_array_len) { 819 type = tlv[0]; 820 length = tlv[1]; 821 822 pr_debug("type 0x%x length %d\n", type, length); 823 824 if (type == LLCP_TLV_SN) { 825 *sn_len = length; 826 return &tlv[2]; 827 } 828 829 offset += length + 2; 830 tlv += length + 2; 831 } 832 833 return NULL; 834 } 835 836 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 837 struct sk_buff *skb) 838 { 839 struct nfc_llcp_sock *llcp_sock; 840 struct nfc_llcp_ui_cb *ui_cb; 841 u8 dsap, ssap; 842 843 dsap = nfc_llcp_dsap(skb); 844 ssap = nfc_llcp_ssap(skb); 845 846 ui_cb = nfc_llcp_ui_skb_cb(skb); 847 ui_cb->dsap = dsap; 848 ui_cb->ssap = ssap; 849 850 pr_debug("%d %d\n", dsap, ssap); 851 852 /* We're looking for a bound socket, not a client one */ 853 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 854 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 855 return; 856 857 /* There is no sequence with UI frames */ 858 skb_pull(skb, LLCP_HEADER_SIZE); 859 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 860 /* 861 * UI frames will be freed from the socket layer, so we 862 * need to keep them alive until someone receives them. 863 */ 864 skb_get(skb); 865 } else { 866 pr_err("Receive queue is full\n"); 867 } 868 869 nfc_llcp_sock_put(llcp_sock); 870 } 871 872 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 873 struct sk_buff *skb) 874 { 875 struct sock *new_sk, *parent; 876 struct nfc_llcp_sock *sock, *new_sock; 877 u8 dsap, ssap, reason; 878 879 dsap = nfc_llcp_dsap(skb); 880 ssap = nfc_llcp_ssap(skb); 881 882 pr_debug("%d %d\n", dsap, ssap); 883 884 if (dsap != LLCP_SAP_SDP) { 885 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 886 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 887 reason = LLCP_DM_NOBOUND; 888 goto fail; 889 } 890 } else { 891 u8 *sn; 892 size_t sn_len; 893 894 sn = nfc_llcp_connect_sn(skb, &sn_len); 895 if (sn == NULL) { 896 reason = LLCP_DM_NOBOUND; 897 goto fail; 898 } 899 900 pr_debug("Service name length %zu\n", sn_len); 901 902 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 903 if (sock == NULL) { 904 reason = LLCP_DM_NOBOUND; 905 goto fail; 906 } 907 } 908 909 lock_sock(&sock->sk); 910 911 parent = &sock->sk; 912 913 if (sk_acceptq_is_full(parent)) { 914 reason = LLCP_DM_REJ; 915 release_sock(&sock->sk); 916 sock_put(&sock->sk); 917 goto fail; 918 } 919 920 if (sock->ssap == LLCP_SDP_UNBOUND) { 921 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 922 923 pr_debug("First client, reserving %d\n", ssap); 924 925 if (ssap == LLCP_SAP_MAX) { 926 reason = LLCP_DM_REJ; 927 release_sock(&sock->sk); 928 sock_put(&sock->sk); 929 goto fail; 930 } 931 932 sock->ssap = ssap; 933 } 934 935 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); 936 if (new_sk == NULL) { 937 reason = LLCP_DM_REJ; 938 release_sock(&sock->sk); 939 sock_put(&sock->sk); 940 goto fail; 941 } 942 943 new_sock = nfc_llcp_sock(new_sk); 944 new_sock->dev = local->dev; 945 new_sock->local = nfc_llcp_local_get(local); 946 new_sock->rw = sock->rw; 947 new_sock->miux = sock->miux; 948 new_sock->nfc_protocol = sock->nfc_protocol; 949 new_sock->dsap = ssap; 950 new_sock->target_idx = local->target_idx; 951 new_sock->parent = parent; 952 new_sock->ssap = sock->ssap; 953 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 954 atomic_t *client_count; 955 956 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 957 958 client_count = 959 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 960 961 atomic_inc(client_count); 962 new_sock->reserved_ssap = sock->ssap; 963 } 964 965 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 966 skb->len - LLCP_HEADER_SIZE); 967 968 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 969 970 nfc_llcp_sock_link(&local->sockets, new_sk); 971 972 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 973 974 nfc_get_device(local->dev->idx); 975 976 new_sk->sk_state = LLCP_CONNECTED; 977 978 /* Wake the listening processes */ 979 parent->sk_data_ready(parent); 980 981 /* Send CC */ 982 nfc_llcp_send_cc(new_sock); 983 984 release_sock(&sock->sk); 985 sock_put(&sock->sk); 986 987 return; 988 989 fail: 990 /* Send DM */ 991 nfc_llcp_send_dm(local, dsap, ssap, reason); 992 } 993 994 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 995 { 996 int nr_frames = 0; 997 struct nfc_llcp_local *local = sock->local; 998 999 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1000 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1001 sock->remote_rw); 1002 1003 /* Try to queue some I frames for transmission */ 1004 while (sock->remote_ready && 1005 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1006 struct sk_buff *pdu; 1007 1008 pdu = skb_dequeue(&sock->tx_queue); 1009 if (pdu == NULL) 1010 break; 1011 1012 /* Update N(S)/N(R) */ 1013 nfc_llcp_set_nrns(sock, pdu); 1014 1015 skb_queue_tail(&local->tx_queue, pdu); 1016 nr_frames++; 1017 } 1018 1019 return nr_frames; 1020 } 1021 1022 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1023 struct sk_buff *skb) 1024 { 1025 struct nfc_llcp_sock *llcp_sock; 1026 struct sock *sk; 1027 u8 dsap, ssap, ptype, ns, nr; 1028 1029 ptype = nfc_llcp_ptype(skb); 1030 dsap = nfc_llcp_dsap(skb); 1031 ssap = nfc_llcp_ssap(skb); 1032 ns = nfc_llcp_ns(skb); 1033 nr = nfc_llcp_nr(skb); 1034 1035 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1036 1037 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1038 if (llcp_sock == NULL) { 1039 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1040 return; 1041 } 1042 1043 sk = &llcp_sock->sk; 1044 lock_sock(sk); 1045 if (sk->sk_state == LLCP_CLOSED) { 1046 release_sock(sk); 1047 nfc_llcp_sock_put(llcp_sock); 1048 } 1049 1050 /* Pass the payload upstream */ 1051 if (ptype == LLCP_PDU_I) { 1052 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1053 1054 if (ns == llcp_sock->recv_n) 1055 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1056 else 1057 pr_err("Received out of sequence I PDU\n"); 1058 1059 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1060 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1061 /* 1062 * I frames will be freed from the socket layer, so we 1063 * need to keep them alive until someone receives them. 1064 */ 1065 skb_get(skb); 1066 } else { 1067 pr_err("Receive queue is full\n"); 1068 } 1069 } 1070 1071 /* Remove skbs from the pending queue */ 1072 if (llcp_sock->send_ack_n != nr) { 1073 struct sk_buff *s, *tmp; 1074 u8 n; 1075 1076 llcp_sock->send_ack_n = nr; 1077 1078 /* Remove and free all skbs until ns == nr */ 1079 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1080 n = nfc_llcp_ns(s); 1081 1082 skb_unlink(s, &llcp_sock->tx_pending_queue); 1083 kfree_skb(s); 1084 1085 if (n == nr) 1086 break; 1087 } 1088 1089 /* Re-queue the remaining skbs for transmission */ 1090 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1091 s, tmp) { 1092 skb_unlink(s, &llcp_sock->tx_pending_queue); 1093 skb_queue_head(&local->tx_queue, s); 1094 } 1095 } 1096 1097 if (ptype == LLCP_PDU_RR) 1098 llcp_sock->remote_ready = true; 1099 else if (ptype == LLCP_PDU_RNR) 1100 llcp_sock->remote_ready = false; 1101 1102 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1103 nfc_llcp_send_rr(llcp_sock); 1104 1105 release_sock(sk); 1106 nfc_llcp_sock_put(llcp_sock); 1107 } 1108 1109 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1110 struct sk_buff *skb) 1111 { 1112 struct nfc_llcp_sock *llcp_sock; 1113 struct sock *sk; 1114 u8 dsap, ssap; 1115 1116 dsap = nfc_llcp_dsap(skb); 1117 ssap = nfc_llcp_ssap(skb); 1118 1119 if ((dsap == 0) && (ssap == 0)) { 1120 pr_debug("Connection termination"); 1121 nfc_dep_link_down(local->dev); 1122 return; 1123 } 1124 1125 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1126 if (llcp_sock == NULL) { 1127 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1128 return; 1129 } 1130 1131 sk = &llcp_sock->sk; 1132 lock_sock(sk); 1133 1134 nfc_llcp_socket_purge(llcp_sock); 1135 1136 if (sk->sk_state == LLCP_CLOSED) { 1137 release_sock(sk); 1138 nfc_llcp_sock_put(llcp_sock); 1139 } 1140 1141 if (sk->sk_state == LLCP_CONNECTED) { 1142 nfc_put_device(local->dev); 1143 sk->sk_state = LLCP_CLOSED; 1144 sk->sk_state_change(sk); 1145 } 1146 1147 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1148 1149 release_sock(sk); 1150 nfc_llcp_sock_put(llcp_sock); 1151 } 1152 1153 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) 1154 { 1155 struct nfc_llcp_sock *llcp_sock; 1156 struct sock *sk; 1157 u8 dsap, ssap; 1158 1159 dsap = nfc_llcp_dsap(skb); 1160 ssap = nfc_llcp_ssap(skb); 1161 1162 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1163 if (llcp_sock == NULL) { 1164 pr_err("Invalid CC\n"); 1165 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1166 1167 return; 1168 } 1169 1170 sk = &llcp_sock->sk; 1171 1172 /* Unlink from connecting and link to the client array */ 1173 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1174 nfc_llcp_sock_link(&local->sockets, sk); 1175 llcp_sock->dsap = ssap; 1176 1177 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1178 skb->len - LLCP_HEADER_SIZE); 1179 1180 sk->sk_state = LLCP_CONNECTED; 1181 sk->sk_state_change(sk); 1182 1183 nfc_llcp_sock_put(llcp_sock); 1184 } 1185 1186 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) 1187 { 1188 struct nfc_llcp_sock *llcp_sock; 1189 struct sock *sk; 1190 u8 dsap, ssap, reason; 1191 1192 dsap = nfc_llcp_dsap(skb); 1193 ssap = nfc_llcp_ssap(skb); 1194 reason = skb->data[2]; 1195 1196 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1197 1198 switch (reason) { 1199 case LLCP_DM_NOBOUND: 1200 case LLCP_DM_REJ: 1201 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1202 break; 1203 1204 default: 1205 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1206 break; 1207 } 1208 1209 if (llcp_sock == NULL) { 1210 pr_debug("Already closed\n"); 1211 return; 1212 } 1213 1214 sk = &llcp_sock->sk; 1215 1216 sk->sk_err = ENXIO; 1217 sk->sk_state = LLCP_CLOSED; 1218 sk->sk_state_change(sk); 1219 1220 nfc_llcp_sock_put(llcp_sock); 1221 } 1222 1223 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1224 struct sk_buff *skb) 1225 { 1226 struct nfc_llcp_sock *llcp_sock; 1227 u8 dsap, ssap, *tlv, type, length, tid, sap; 1228 u16 tlv_len, offset; 1229 char *service_name; 1230 size_t service_name_len; 1231 struct nfc_llcp_sdp_tlv *sdp; 1232 HLIST_HEAD(llc_sdres_list); 1233 size_t sdres_tlvs_len; 1234 HLIST_HEAD(nl_sdres_list); 1235 1236 dsap = nfc_llcp_dsap(skb); 1237 ssap = nfc_llcp_ssap(skb); 1238 1239 pr_debug("%d %d\n", dsap, ssap); 1240 1241 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1242 pr_err("Wrong SNL SAP\n"); 1243 return; 1244 } 1245 1246 tlv = &skb->data[LLCP_HEADER_SIZE]; 1247 tlv_len = skb->len - LLCP_HEADER_SIZE; 1248 offset = 0; 1249 sdres_tlvs_len = 0; 1250 1251 while (offset < tlv_len) { 1252 type = tlv[0]; 1253 length = tlv[1]; 1254 1255 switch (type) { 1256 case LLCP_TLV_SDREQ: 1257 tid = tlv[2]; 1258 service_name = (char *) &tlv[3]; 1259 service_name_len = length - 1; 1260 1261 pr_debug("Looking for %.16s\n", service_name); 1262 1263 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1264 !strncmp(service_name, "urn:nfc:sn:sdp", 1265 service_name_len)) { 1266 sap = 1; 1267 goto add_snl; 1268 } 1269 1270 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1271 service_name_len); 1272 if (!llcp_sock) { 1273 sap = 0; 1274 goto add_snl; 1275 } 1276 1277 /* 1278 * We found a socket but its ssap has not been reserved 1279 * yet. We need to assign it for good and send a reply. 1280 * The ssap will be freed when the socket is closed. 1281 */ 1282 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1283 atomic_t *client_count; 1284 1285 sap = nfc_llcp_reserve_sdp_ssap(local); 1286 1287 pr_debug("Reserving %d\n", sap); 1288 1289 if (sap == LLCP_SAP_MAX) { 1290 sap = 0; 1291 goto add_snl; 1292 } 1293 1294 client_count = 1295 &local->local_sdp_cnt[sap - 1296 LLCP_WKS_NUM_SAP]; 1297 1298 atomic_inc(client_count); 1299 1300 llcp_sock->ssap = sap; 1301 llcp_sock->reserved_ssap = sap; 1302 } else { 1303 sap = llcp_sock->ssap; 1304 } 1305 1306 pr_debug("%p %d\n", llcp_sock, sap); 1307 1308 add_snl: 1309 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1310 if (sdp == NULL) 1311 goto exit; 1312 1313 sdres_tlvs_len += sdp->tlv_len; 1314 hlist_add_head(&sdp->node, &llc_sdres_list); 1315 break; 1316 1317 case LLCP_TLV_SDRES: 1318 mutex_lock(&local->sdreq_lock); 1319 1320 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1321 1322 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1323 if (sdp->tid != tlv[2]) 1324 continue; 1325 1326 sdp->sap = tlv[3]; 1327 1328 pr_debug("Found: uri=%s, sap=%d\n", 1329 sdp->uri, sdp->sap); 1330 1331 hlist_del(&sdp->node); 1332 1333 hlist_add_head(&sdp->node, &nl_sdres_list); 1334 1335 break; 1336 } 1337 1338 mutex_unlock(&local->sdreq_lock); 1339 break; 1340 1341 default: 1342 pr_err("Invalid SNL tlv value 0x%x\n", type); 1343 break; 1344 } 1345 1346 offset += length + 2; 1347 tlv += length + 2; 1348 } 1349 1350 exit: 1351 if (!hlist_empty(&nl_sdres_list)) 1352 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1353 1354 if (!hlist_empty(&llc_sdres_list)) 1355 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1356 } 1357 1358 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1359 { 1360 u8 ptype; 1361 u16 pdu_len; 1362 struct sk_buff *new_skb; 1363 1364 if (skb->len <= LLCP_HEADER_SIZE) { 1365 pr_err("Malformed AGF PDU\n"); 1366 return; 1367 } 1368 1369 skb_pull(skb, LLCP_HEADER_SIZE); 1370 1371 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1372 pdu_len = skb->data[0] << 8 | skb->data[1]; 1373 1374 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1375 1376 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1377 pr_err("Malformed AGF PDU\n"); 1378 return; 1379 } 1380 1381 ptype = nfc_llcp_ptype(skb); 1382 1383 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1384 goto next; 1385 1386 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1387 if (new_skb == NULL) { 1388 pr_err("Could not allocate PDU\n"); 1389 return; 1390 } 1391 1392 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len); 1393 1394 nfc_llcp_rx_skb(local, new_skb); 1395 1396 kfree_skb(new_skb); 1397 next: 1398 skb_pull(skb, pdu_len); 1399 } 1400 } 1401 1402 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1403 { 1404 u8 dsap, ssap, ptype; 1405 1406 ptype = nfc_llcp_ptype(skb); 1407 dsap = nfc_llcp_dsap(skb); 1408 ssap = nfc_llcp_ssap(skb); 1409 1410 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1411 1412 if (ptype != LLCP_PDU_SYMM) 1413 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, 1414 16, 1, skb->data, skb->len, true); 1415 1416 switch (ptype) { 1417 case LLCP_PDU_SYMM: 1418 pr_debug("SYMM\n"); 1419 break; 1420 1421 case LLCP_PDU_UI: 1422 pr_debug("UI\n"); 1423 nfc_llcp_recv_ui(local, skb); 1424 break; 1425 1426 case LLCP_PDU_CONNECT: 1427 pr_debug("CONNECT\n"); 1428 nfc_llcp_recv_connect(local, skb); 1429 break; 1430 1431 case LLCP_PDU_DISC: 1432 pr_debug("DISC\n"); 1433 nfc_llcp_recv_disc(local, skb); 1434 break; 1435 1436 case LLCP_PDU_CC: 1437 pr_debug("CC\n"); 1438 nfc_llcp_recv_cc(local, skb); 1439 break; 1440 1441 case LLCP_PDU_DM: 1442 pr_debug("DM\n"); 1443 nfc_llcp_recv_dm(local, skb); 1444 break; 1445 1446 case LLCP_PDU_SNL: 1447 pr_debug("SNL\n"); 1448 nfc_llcp_recv_snl(local, skb); 1449 break; 1450 1451 case LLCP_PDU_I: 1452 case LLCP_PDU_RR: 1453 case LLCP_PDU_RNR: 1454 pr_debug("I frame\n"); 1455 nfc_llcp_recv_hdlc(local, skb); 1456 break; 1457 1458 case LLCP_PDU_AGF: 1459 pr_debug("AGF frame\n"); 1460 nfc_llcp_recv_agf(local, skb); 1461 break; 1462 } 1463 } 1464 1465 static void nfc_llcp_rx_work(struct work_struct *work) 1466 { 1467 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1468 rx_work); 1469 struct sk_buff *skb; 1470 1471 skb = local->rx_pending; 1472 if (skb == NULL) { 1473 pr_debug("No pending SKB\n"); 1474 return; 1475 } 1476 1477 __net_timestamp(skb); 1478 1479 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); 1480 1481 nfc_llcp_rx_skb(local, skb); 1482 1483 schedule_work(&local->tx_work); 1484 kfree_skb(local->rx_pending); 1485 local->rx_pending = NULL; 1486 } 1487 1488 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1489 { 1490 local->rx_pending = skb; 1491 del_timer(&local->link_timer); 1492 schedule_work(&local->rx_work); 1493 } 1494 1495 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1496 { 1497 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1498 1499 pr_debug("Received an LLCP PDU\n"); 1500 if (err < 0) { 1501 pr_err("err %d\n", err); 1502 return; 1503 } 1504 1505 __nfc_llcp_recv(local, skb); 1506 } 1507 1508 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1509 { 1510 struct nfc_llcp_local *local; 1511 1512 local = nfc_llcp_find_local(dev); 1513 if (local == NULL) 1514 return -ENODEV; 1515 1516 __nfc_llcp_recv(local, skb); 1517 1518 return 0; 1519 } 1520 1521 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1522 { 1523 struct nfc_llcp_local *local; 1524 1525 local = nfc_llcp_find_local(dev); 1526 if (local == NULL) 1527 return; 1528 1529 local->remote_miu = LLCP_DEFAULT_MIU; 1530 local->remote_lto = LLCP_DEFAULT_LTO; 1531 1532 /* Close and purge all existing sockets */ 1533 nfc_llcp_socket_release(local, true, 0); 1534 } 1535 1536 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1537 u8 comm_mode, u8 rf_mode) 1538 { 1539 struct nfc_llcp_local *local; 1540 1541 pr_debug("rf mode %d\n", rf_mode); 1542 1543 local = nfc_llcp_find_local(dev); 1544 if (local == NULL) 1545 return; 1546 1547 local->target_idx = target_idx; 1548 local->comm_mode = comm_mode; 1549 local->rf_mode = rf_mode; 1550 1551 if (rf_mode == NFC_RF_INITIATOR) { 1552 pr_debug("Queueing Tx work\n"); 1553 1554 schedule_work(&local->tx_work); 1555 } else { 1556 mod_timer(&local->link_timer, 1557 jiffies + msecs_to_jiffies(local->remote_lto)); 1558 } 1559 } 1560 1561 int nfc_llcp_register_device(struct nfc_dev *ndev) 1562 { 1563 struct nfc_llcp_local *local; 1564 1565 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1566 if (local == NULL) 1567 return -ENOMEM; 1568 1569 local->dev = ndev; 1570 INIT_LIST_HEAD(&local->list); 1571 kref_init(&local->ref); 1572 mutex_init(&local->sdp_lock); 1573 init_timer(&local->link_timer); 1574 local->link_timer.data = (unsigned long) local; 1575 local->link_timer.function = nfc_llcp_symm_timer; 1576 1577 skb_queue_head_init(&local->tx_queue); 1578 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1579 1580 local->rx_pending = NULL; 1581 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1582 1583 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1584 1585 rwlock_init(&local->sockets.lock); 1586 rwlock_init(&local->connecting_sockets.lock); 1587 rwlock_init(&local->raw_sockets.lock); 1588 1589 local->lto = 150; /* 1500 ms */ 1590 local->rw = LLCP_MAX_RW; 1591 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1592 local->local_wks = 0x1; /* LLC Link Management */ 1593 1594 nfc_llcp_build_gb(local); 1595 1596 local->remote_miu = LLCP_DEFAULT_MIU; 1597 local->remote_lto = LLCP_DEFAULT_LTO; 1598 1599 mutex_init(&local->sdreq_lock); 1600 INIT_HLIST_HEAD(&local->pending_sdreqs); 1601 init_timer(&local->sdreq_timer); 1602 local->sdreq_timer.data = (unsigned long) local; 1603 local->sdreq_timer.function = nfc_llcp_sdreq_timer; 1604 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1605 1606 list_add(&local->list, &llcp_devices); 1607 1608 return 0; 1609 } 1610 1611 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1612 { 1613 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 1614 1615 if (local == NULL) { 1616 pr_debug("No such device\n"); 1617 return; 1618 } 1619 1620 local_cleanup(local); 1621 1622 nfc_llcp_local_put(local); 1623 } 1624 1625 int __init nfc_llcp_init(void) 1626 { 1627 return nfc_llcp_sock_init(); 1628 } 1629 1630 void nfc_llcp_exit(void) 1631 { 1632 nfc_llcp_sock_exit(); 1633 } 1634