1 /* 2 * Copyright (C) 2011 Intel Corporation. All rights reserved. 3 * Copyright (C) 2014 Marvell International Ltd. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ 20 21 #include <linux/init.h> 22 #include <linux/kernel.h> 23 #include <linux/list.h> 24 #include <linux/nfc.h> 25 26 #include "nfc.h" 27 #include "llcp.h" 28 29 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; 30 31 static LIST_HEAD(llcp_devices); 32 33 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); 34 35 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) 36 { 37 write_lock(&l->lock); 38 sk_add_node(sk, &l->head); 39 write_unlock(&l->lock); 40 } 41 42 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) 43 { 44 write_lock(&l->lock); 45 sk_del_node_init(sk); 46 write_unlock(&l->lock); 47 } 48 49 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock) 50 { 51 sock->remote_rw = LLCP_DEFAULT_RW; 52 sock->remote_miu = LLCP_MAX_MIU + 1; 53 } 54 55 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) 56 { 57 struct nfc_llcp_local *local = sock->local; 58 struct sk_buff *s, *tmp; 59 60 pr_debug("%p\n", &sock->sk); 61 62 skb_queue_purge(&sock->tx_queue); 63 skb_queue_purge(&sock->tx_pending_queue); 64 65 if (local == NULL) 66 return; 67 68 /* Search for local pending SKBs that are related to this socket */ 69 skb_queue_walk_safe(&local->tx_queue, s, tmp) { 70 if (s->sk != &sock->sk) 71 continue; 72 73 skb_unlink(s, &local->tx_queue); 74 kfree_skb(s); 75 } 76 } 77 78 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device, 79 int err) 80 { 81 struct sock *sk; 82 struct hlist_node *tmp; 83 struct nfc_llcp_sock *llcp_sock; 84 85 skb_queue_purge(&local->tx_queue); 86 87 write_lock(&local->sockets.lock); 88 89 sk_for_each_safe(sk, tmp, &local->sockets.head) { 90 llcp_sock = nfc_llcp_sock(sk); 91 92 bh_lock_sock(sk); 93 94 nfc_llcp_socket_purge(llcp_sock); 95 96 if (sk->sk_state == LLCP_CONNECTED) 97 nfc_put_device(llcp_sock->dev); 98 99 if (sk->sk_state == LLCP_LISTEN) { 100 struct nfc_llcp_sock *lsk, *n; 101 struct sock *accept_sk; 102 103 list_for_each_entry_safe(lsk, n, 104 &llcp_sock->accept_queue, 105 accept_queue) { 106 accept_sk = &lsk->sk; 107 bh_lock_sock(accept_sk); 108 109 nfc_llcp_accept_unlink(accept_sk); 110 111 if (err) 112 accept_sk->sk_err = err; 113 accept_sk->sk_state = LLCP_CLOSED; 114 accept_sk->sk_state_change(sk); 115 116 bh_unlock_sock(accept_sk); 117 } 118 } 119 120 if (err) 121 sk->sk_err = err; 122 sk->sk_state = LLCP_CLOSED; 123 sk->sk_state_change(sk); 124 125 bh_unlock_sock(sk); 126 127 sk_del_node_init(sk); 128 } 129 130 write_unlock(&local->sockets.lock); 131 132 /* If we still have a device, we keep the RAW sockets alive */ 133 if (device == true) 134 return; 135 136 write_lock(&local->raw_sockets.lock); 137 138 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) { 139 llcp_sock = nfc_llcp_sock(sk); 140 141 bh_lock_sock(sk); 142 143 nfc_llcp_socket_purge(llcp_sock); 144 145 if (err) 146 sk->sk_err = err; 147 sk->sk_state = LLCP_CLOSED; 148 sk->sk_state_change(sk); 149 150 bh_unlock_sock(sk); 151 152 sk_del_node_init(sk); 153 } 154 155 write_unlock(&local->raw_sockets.lock); 156 } 157 158 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) 159 { 160 kref_get(&local->ref); 161 162 return local; 163 } 164 165 static void local_cleanup(struct nfc_llcp_local *local) 166 { 167 nfc_llcp_socket_release(local, false, ENXIO); 168 del_timer_sync(&local->link_timer); 169 skb_queue_purge(&local->tx_queue); 170 cancel_work_sync(&local->tx_work); 171 cancel_work_sync(&local->rx_work); 172 cancel_work_sync(&local->timeout_work); 173 kfree_skb(local->rx_pending); 174 del_timer_sync(&local->sdreq_timer); 175 cancel_work_sync(&local->sdreq_timeout_work); 176 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs); 177 } 178 179 static void local_release(struct kref *ref) 180 { 181 struct nfc_llcp_local *local; 182 183 local = container_of(ref, struct nfc_llcp_local, ref); 184 185 list_del(&local->list); 186 local_cleanup(local); 187 kfree(local); 188 } 189 190 int nfc_llcp_local_put(struct nfc_llcp_local *local) 191 { 192 if (local == NULL) 193 return 0; 194 195 return kref_put(&local->ref, local_release); 196 } 197 198 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, 199 u8 ssap, u8 dsap) 200 { 201 struct sock *sk; 202 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 203 204 pr_debug("ssap dsap %d %d\n", ssap, dsap); 205 206 if (ssap == 0 && dsap == 0) 207 return NULL; 208 209 read_lock(&local->sockets.lock); 210 211 llcp_sock = NULL; 212 213 sk_for_each(sk, &local->sockets.head) { 214 tmp_sock = nfc_llcp_sock(sk); 215 216 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { 217 llcp_sock = tmp_sock; 218 break; 219 } 220 } 221 222 read_unlock(&local->sockets.lock); 223 224 if (llcp_sock == NULL) 225 return NULL; 226 227 sock_hold(&llcp_sock->sk); 228 229 return llcp_sock; 230 } 231 232 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 233 { 234 sock_put(&sock->sk); 235 } 236 237 static void nfc_llcp_timeout_work(struct work_struct *work) 238 { 239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 240 timeout_work); 241 242 nfc_dep_link_down(local->dev); 243 } 244 245 static void nfc_llcp_symm_timer(struct timer_list *t) 246 { 247 struct nfc_llcp_local *local = from_timer(local, t, link_timer); 248 249 pr_err("SYMM timeout\n"); 250 251 schedule_work(&local->timeout_work); 252 } 253 254 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work) 255 { 256 unsigned long time; 257 HLIST_HEAD(nl_sdres_list); 258 struct hlist_node *n; 259 struct nfc_llcp_sdp_tlv *sdp; 260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 261 sdreq_timeout_work); 262 263 mutex_lock(&local->sdreq_lock); 264 265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto); 266 267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) { 268 if (time_after(sdp->time, time)) 269 continue; 270 271 sdp->sap = LLCP_SDP_UNBOUND; 272 273 hlist_del(&sdp->node); 274 275 hlist_add_head(&sdp->node, &nl_sdres_list); 276 } 277 278 if (!hlist_empty(&local->pending_sdreqs)) 279 mod_timer(&local->sdreq_timer, 280 jiffies + msecs_to_jiffies(3 * local->remote_lto)); 281 282 mutex_unlock(&local->sdreq_lock); 283 284 if (!hlist_empty(&nl_sdres_list)) 285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 286 } 287 288 static void nfc_llcp_sdreq_timer(struct timer_list *t) 289 { 290 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer); 291 292 schedule_work(&local->sdreq_timeout_work); 293 } 294 295 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) 296 { 297 struct nfc_llcp_local *local; 298 299 list_for_each_entry(local, &llcp_devices, list) 300 if (local->dev == dev) 301 return local; 302 303 pr_debug("No device found\n"); 304 305 return NULL; 306 } 307 308 static char *wks[] = { 309 NULL, 310 NULL, /* SDP */ 311 "urn:nfc:sn:ip", 312 "urn:nfc:sn:obex", 313 "urn:nfc:sn:snep", 314 }; 315 316 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) 317 { 318 int sap, num_wks; 319 320 pr_debug("%s\n", service_name); 321 322 if (service_name == NULL) 323 return -EINVAL; 324 325 num_wks = ARRAY_SIZE(wks); 326 327 for (sap = 0; sap < num_wks; sap++) { 328 if (wks[sap] == NULL) 329 continue; 330 331 if (strncmp(wks[sap], service_name, service_name_len) == 0) 332 return sap; 333 } 334 335 return -EINVAL; 336 } 337 338 static 339 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, 340 u8 *sn, size_t sn_len) 341 { 342 struct sock *sk; 343 struct nfc_llcp_sock *llcp_sock, *tmp_sock; 344 345 pr_debug("sn %zd %p\n", sn_len, sn); 346 347 if (sn == NULL || sn_len == 0) 348 return NULL; 349 350 read_lock(&local->sockets.lock); 351 352 llcp_sock = NULL; 353 354 sk_for_each(sk, &local->sockets.head) { 355 tmp_sock = nfc_llcp_sock(sk); 356 357 pr_debug("llcp sock %p\n", tmp_sock); 358 359 if (tmp_sock->sk.sk_type == SOCK_STREAM && 360 tmp_sock->sk.sk_state != LLCP_LISTEN) 361 continue; 362 363 if (tmp_sock->sk.sk_type == SOCK_DGRAM && 364 tmp_sock->sk.sk_state != LLCP_BOUND) 365 continue; 366 367 if (tmp_sock->service_name == NULL || 368 tmp_sock->service_name_len == 0) 369 continue; 370 371 if (tmp_sock->service_name_len != sn_len) 372 continue; 373 374 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { 375 llcp_sock = tmp_sock; 376 break; 377 } 378 } 379 380 read_unlock(&local->sockets.lock); 381 382 pr_debug("Found llcp sock %p\n", llcp_sock); 383 384 return llcp_sock; 385 } 386 387 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, 388 struct nfc_llcp_sock *sock) 389 { 390 mutex_lock(&local->sdp_lock); 391 392 if (sock->service_name != NULL && sock->service_name_len > 0) { 393 int ssap = nfc_llcp_wks_sap(sock->service_name, 394 sock->service_name_len); 395 396 if (ssap > 0) { 397 pr_debug("WKS %d\n", ssap); 398 399 /* This is a WKS, let's check if it's free */ 400 if (local->local_wks & BIT(ssap)) { 401 mutex_unlock(&local->sdp_lock); 402 403 return LLCP_SAP_MAX; 404 } 405 406 set_bit(ssap, &local->local_wks); 407 mutex_unlock(&local->sdp_lock); 408 409 return ssap; 410 } 411 412 /* 413 * Check if there already is a non WKS socket bound 414 * to this service name. 415 */ 416 if (nfc_llcp_sock_from_sn(local, sock->service_name, 417 sock->service_name_len) != NULL) { 418 mutex_unlock(&local->sdp_lock); 419 420 return LLCP_SAP_MAX; 421 } 422 423 mutex_unlock(&local->sdp_lock); 424 425 return LLCP_SDP_UNBOUND; 426 427 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { 428 if (!test_bit(sock->ssap, &local->local_wks)) { 429 set_bit(sock->ssap, &local->local_wks); 430 mutex_unlock(&local->sdp_lock); 431 432 return sock->ssap; 433 } 434 } 435 436 mutex_unlock(&local->sdp_lock); 437 438 return LLCP_SAP_MAX; 439 } 440 441 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) 442 { 443 u8 local_ssap; 444 445 mutex_lock(&local->sdp_lock); 446 447 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); 448 if (local_ssap == LLCP_LOCAL_NUM_SAP) { 449 mutex_unlock(&local->sdp_lock); 450 return LLCP_SAP_MAX; 451 } 452 453 set_bit(local_ssap, &local->local_sap); 454 455 mutex_unlock(&local->sdp_lock); 456 457 return local_ssap + LLCP_LOCAL_SAP_OFFSET; 458 } 459 460 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) 461 { 462 u8 local_ssap; 463 unsigned long *sdp; 464 465 if (ssap < LLCP_WKS_NUM_SAP) { 466 local_ssap = ssap; 467 sdp = &local->local_wks; 468 } else if (ssap < LLCP_LOCAL_NUM_SAP) { 469 atomic_t *client_cnt; 470 471 local_ssap = ssap - LLCP_WKS_NUM_SAP; 472 sdp = &local->local_sdp; 473 client_cnt = &local->local_sdp_cnt[local_ssap]; 474 475 pr_debug("%d clients\n", atomic_read(client_cnt)); 476 477 mutex_lock(&local->sdp_lock); 478 479 if (atomic_dec_and_test(client_cnt)) { 480 struct nfc_llcp_sock *l_sock; 481 482 pr_debug("No more clients for SAP %d\n", ssap); 483 484 clear_bit(local_ssap, sdp); 485 486 /* Find the listening sock and set it back to UNBOUND */ 487 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); 488 if (l_sock) { 489 l_sock->ssap = LLCP_SDP_UNBOUND; 490 nfc_llcp_sock_put(l_sock); 491 } 492 } 493 494 mutex_unlock(&local->sdp_lock); 495 496 return; 497 } else if (ssap < LLCP_MAX_SAP) { 498 local_ssap = ssap - LLCP_LOCAL_NUM_SAP; 499 sdp = &local->local_sap; 500 } else { 501 return; 502 } 503 504 mutex_lock(&local->sdp_lock); 505 506 clear_bit(local_ssap, sdp); 507 508 mutex_unlock(&local->sdp_lock); 509 } 510 511 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) 512 { 513 u8 ssap; 514 515 mutex_lock(&local->sdp_lock); 516 517 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); 518 if (ssap == LLCP_SDP_NUM_SAP) { 519 mutex_unlock(&local->sdp_lock); 520 521 return LLCP_SAP_MAX; 522 } 523 524 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); 525 526 set_bit(ssap, &local->local_sdp); 527 528 mutex_unlock(&local->sdp_lock); 529 530 return LLCP_WKS_NUM_SAP + ssap; 531 } 532 533 static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 534 { 535 u8 *gb_cur, version, version_length; 536 u8 lto_length, wks_length, miux_length; 537 u8 *version_tlv = NULL, *lto_tlv = NULL, 538 *wks_tlv = NULL, *miux_tlv = NULL; 539 __be16 wks = cpu_to_be16(local->local_wks); 540 u8 gb_len = 0; 541 int ret = 0; 542 543 version = LLCP_VERSION_11; 544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, 545 1, &version_length); 546 if (!version_tlv) { 547 ret = -ENOMEM; 548 goto out; 549 } 550 gb_len += version_length; 551 552 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 553 if (!lto_tlv) { 554 ret = -ENOMEM; 555 goto out; 556 } 557 gb_len += lto_length; 558 559 pr_debug("Local wks 0x%lx\n", local->local_wks); 560 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); 561 if (!wks_tlv) { 562 ret = -ENOMEM; 563 goto out; 564 } 565 gb_len += wks_length; 566 567 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 568 &miux_length); 569 if (!miux_tlv) { 570 ret = -ENOMEM; 571 goto out; 572 } 573 gb_len += miux_length; 574 575 gb_len += ARRAY_SIZE(llcp_magic); 576 577 if (gb_len > NFC_MAX_GT_LEN) { 578 ret = -EINVAL; 579 goto out; 580 } 581 582 gb_cur = local->gb; 583 584 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 585 gb_cur += ARRAY_SIZE(llcp_magic); 586 587 memcpy(gb_cur, version_tlv, version_length); 588 gb_cur += version_length; 589 590 memcpy(gb_cur, lto_tlv, lto_length); 591 gb_cur += lto_length; 592 593 memcpy(gb_cur, wks_tlv, wks_length); 594 gb_cur += wks_length; 595 596 memcpy(gb_cur, miux_tlv, miux_length); 597 gb_cur += miux_length; 598 599 local->gb_len = gb_len; 600 601 out: 602 kfree(version_tlv); 603 kfree(lto_tlv); 604 kfree(wks_tlv); 605 kfree(miux_tlv); 606 607 return ret; 608 } 609 610 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 611 { 612 struct nfc_llcp_local *local; 613 614 local = nfc_llcp_find_local(dev); 615 if (local == NULL) { 616 *general_bytes_len = 0; 617 return NULL; 618 } 619 620 nfc_llcp_build_gb(local); 621 622 *general_bytes_len = local->gb_len; 623 624 return local->gb; 625 } 626 627 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) 628 { 629 struct nfc_llcp_local *local; 630 631 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) 632 return -EINVAL; 633 634 local = nfc_llcp_find_local(dev); 635 if (local == NULL) { 636 pr_err("No LLCP device\n"); 637 return -ENODEV; 638 } 639 640 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 641 memcpy(local->remote_gb, gb, gb_len); 642 local->remote_gb_len = gb_len; 643 644 if (memcmp(local->remote_gb, llcp_magic, 3)) { 645 pr_err("MAC does not support LLCP\n"); 646 return -EINVAL; 647 } 648 649 return nfc_llcp_parse_gb_tlv(local, 650 &local->remote_gb[3], 651 local->remote_gb_len - 3); 652 } 653 654 static u8 nfc_llcp_dsap(struct sk_buff *pdu) 655 { 656 return (pdu->data[0] & 0xfc) >> 2; 657 } 658 659 static u8 nfc_llcp_ptype(struct sk_buff *pdu) 660 { 661 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 662 } 663 664 static u8 nfc_llcp_ssap(struct sk_buff *pdu) 665 { 666 return pdu->data[1] & 0x3f; 667 } 668 669 static u8 nfc_llcp_ns(struct sk_buff *pdu) 670 { 671 return pdu->data[2] >> 4; 672 } 673 674 static u8 nfc_llcp_nr(struct sk_buff *pdu) 675 { 676 return pdu->data[2] & 0xf; 677 } 678 679 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 680 { 681 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 682 sock->send_n = (sock->send_n + 1) % 16; 683 sock->recv_ack_n = (sock->recv_n - 1) % 16; 684 } 685 686 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 687 struct sk_buff *skb, u8 direction) 688 { 689 struct sk_buff *skb_copy = NULL, *nskb; 690 struct sock *sk; 691 u8 *data; 692 693 read_lock(&local->raw_sockets.lock); 694 695 sk_for_each(sk, &local->raw_sockets.head) { 696 if (sk->sk_state != LLCP_BOUND) 697 continue; 698 699 if (skb_copy == NULL) { 700 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, 701 GFP_ATOMIC, true); 702 703 if (skb_copy == NULL) 704 continue; 705 706 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); 707 708 data[0] = local->dev ? local->dev->idx : 0xFF; 709 data[1] = direction & 0x01; 710 data[1] |= (RAW_PAYLOAD_LLCP << 1); 711 } 712 713 nskb = skb_clone(skb_copy, GFP_ATOMIC); 714 if (!nskb) 715 continue; 716 717 if (sock_queue_rcv_skb(sk, nskb)) 718 kfree_skb(nskb); 719 } 720 721 read_unlock(&local->raw_sockets.lock); 722 723 kfree_skb(skb_copy); 724 } 725 726 static void nfc_llcp_tx_work(struct work_struct *work) 727 { 728 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 729 tx_work); 730 struct sk_buff *skb; 731 struct sock *sk; 732 struct nfc_llcp_sock *llcp_sock; 733 734 skb = skb_dequeue(&local->tx_queue); 735 if (skb != NULL) { 736 sk = skb->sk; 737 llcp_sock = nfc_llcp_sock(sk); 738 739 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 740 kfree_skb(skb); 741 nfc_llcp_send_symm(local->dev); 742 } else if (llcp_sock && !llcp_sock->remote_ready) { 743 skb_queue_head(&local->tx_queue, skb); 744 nfc_llcp_send_symm(local->dev); 745 } else { 746 struct sk_buff *copy_skb = NULL; 747 u8 ptype = nfc_llcp_ptype(skb); 748 int ret; 749 750 pr_debug("Sending pending skb\n"); 751 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET, 752 16, 1, skb->data, skb->len, true); 753 754 if (ptype == LLCP_PDU_DISC && sk != NULL && 755 sk->sk_state == LLCP_DISCONNECTING) { 756 nfc_llcp_sock_unlink(&local->sockets, sk); 757 sock_orphan(sk); 758 sock_put(sk); 759 } 760 761 if (ptype == LLCP_PDU_I) 762 copy_skb = skb_copy(skb, GFP_ATOMIC); 763 764 __net_timestamp(skb); 765 766 nfc_llcp_send_to_raw_sock(local, skb, 767 NFC_DIRECTION_TX); 768 769 ret = nfc_data_exchange(local->dev, local->target_idx, 770 skb, nfc_llcp_recv, local); 771 772 if (ret) { 773 kfree_skb(copy_skb); 774 goto out; 775 } 776 777 if (ptype == LLCP_PDU_I && copy_skb) 778 skb_queue_tail(&llcp_sock->tx_pending_queue, 779 copy_skb); 780 } 781 } else { 782 nfc_llcp_send_symm(local->dev); 783 } 784 785 out: 786 mod_timer(&local->link_timer, 787 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 788 } 789 790 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 791 u8 ssap) 792 { 793 struct sock *sk; 794 struct nfc_llcp_sock *llcp_sock; 795 796 read_lock(&local->connecting_sockets.lock); 797 798 sk_for_each(sk, &local->connecting_sockets.head) { 799 llcp_sock = nfc_llcp_sock(sk); 800 801 if (llcp_sock->ssap == ssap) { 802 sock_hold(&llcp_sock->sk); 803 goto out; 804 } 805 } 806 807 llcp_sock = NULL; 808 809 out: 810 read_unlock(&local->connecting_sockets.lock); 811 812 return llcp_sock; 813 } 814 815 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 816 u8 *sn, size_t sn_len) 817 { 818 struct nfc_llcp_sock *llcp_sock; 819 820 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); 821 822 if (llcp_sock == NULL) 823 return NULL; 824 825 sock_hold(&llcp_sock->sk); 826 827 return llcp_sock; 828 } 829 830 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 831 { 832 u8 *tlv = &skb->data[2], type, length; 833 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 834 835 while (offset < tlv_array_len) { 836 type = tlv[0]; 837 length = tlv[1]; 838 839 pr_debug("type 0x%x length %d\n", type, length); 840 841 if (type == LLCP_TLV_SN) { 842 *sn_len = length; 843 return &tlv[2]; 844 } 845 846 offset += length + 2; 847 tlv += length + 2; 848 } 849 850 return NULL; 851 } 852 853 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 854 struct sk_buff *skb) 855 { 856 struct nfc_llcp_sock *llcp_sock; 857 struct nfc_llcp_ui_cb *ui_cb; 858 u8 dsap, ssap; 859 860 dsap = nfc_llcp_dsap(skb); 861 ssap = nfc_llcp_ssap(skb); 862 863 ui_cb = nfc_llcp_ui_skb_cb(skb); 864 ui_cb->dsap = dsap; 865 ui_cb->ssap = ssap; 866 867 pr_debug("%d %d\n", dsap, ssap); 868 869 /* We're looking for a bound socket, not a client one */ 870 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 871 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 872 return; 873 874 /* There is no sequence with UI frames */ 875 skb_pull(skb, LLCP_HEADER_SIZE); 876 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 877 /* 878 * UI frames will be freed from the socket layer, so we 879 * need to keep them alive until someone receives them. 880 */ 881 skb_get(skb); 882 } else { 883 pr_err("Receive queue is full\n"); 884 } 885 886 nfc_llcp_sock_put(llcp_sock); 887 } 888 889 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 890 struct sk_buff *skb) 891 { 892 struct sock *new_sk, *parent; 893 struct nfc_llcp_sock *sock, *new_sock; 894 u8 dsap, ssap, reason; 895 896 dsap = nfc_llcp_dsap(skb); 897 ssap = nfc_llcp_ssap(skb); 898 899 pr_debug("%d %d\n", dsap, ssap); 900 901 if (dsap != LLCP_SAP_SDP) { 902 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 903 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 904 reason = LLCP_DM_NOBOUND; 905 goto fail; 906 } 907 } else { 908 u8 *sn; 909 size_t sn_len; 910 911 sn = nfc_llcp_connect_sn(skb, &sn_len); 912 if (sn == NULL) { 913 reason = LLCP_DM_NOBOUND; 914 goto fail; 915 } 916 917 pr_debug("Service name length %zu\n", sn_len); 918 919 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 920 if (sock == NULL) { 921 reason = LLCP_DM_NOBOUND; 922 goto fail; 923 } 924 } 925 926 lock_sock(&sock->sk); 927 928 parent = &sock->sk; 929 930 if (sk_acceptq_is_full(parent)) { 931 reason = LLCP_DM_REJ; 932 release_sock(&sock->sk); 933 sock_put(&sock->sk); 934 goto fail; 935 } 936 937 if (sock->ssap == LLCP_SDP_UNBOUND) { 938 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 939 940 pr_debug("First client, reserving %d\n", ssap); 941 942 if (ssap == LLCP_SAP_MAX) { 943 reason = LLCP_DM_REJ; 944 release_sock(&sock->sk); 945 sock_put(&sock->sk); 946 goto fail; 947 } 948 949 sock->ssap = ssap; 950 } 951 952 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0); 953 if (new_sk == NULL) { 954 reason = LLCP_DM_REJ; 955 release_sock(&sock->sk); 956 sock_put(&sock->sk); 957 goto fail; 958 } 959 960 new_sock = nfc_llcp_sock(new_sk); 961 new_sock->dev = local->dev; 962 new_sock->local = nfc_llcp_local_get(local); 963 new_sock->rw = sock->rw; 964 new_sock->miux = sock->miux; 965 new_sock->nfc_protocol = sock->nfc_protocol; 966 new_sock->dsap = ssap; 967 new_sock->target_idx = local->target_idx; 968 new_sock->parent = parent; 969 new_sock->ssap = sock->ssap; 970 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 971 atomic_t *client_count; 972 973 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 974 975 client_count = 976 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 977 978 atomic_inc(client_count); 979 new_sock->reserved_ssap = sock->ssap; 980 } 981 982 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 983 skb->len - LLCP_HEADER_SIZE); 984 985 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 986 987 nfc_llcp_sock_link(&local->sockets, new_sk); 988 989 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 990 991 nfc_get_device(local->dev->idx); 992 993 new_sk->sk_state = LLCP_CONNECTED; 994 995 /* Wake the listening processes */ 996 parent->sk_data_ready(parent); 997 998 /* Send CC */ 999 nfc_llcp_send_cc(new_sock); 1000 1001 release_sock(&sock->sk); 1002 sock_put(&sock->sk); 1003 1004 return; 1005 1006 fail: 1007 /* Send DM */ 1008 nfc_llcp_send_dm(local, dsap, ssap, reason); 1009 } 1010 1011 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 1012 { 1013 int nr_frames = 0; 1014 struct nfc_llcp_local *local = sock->local; 1015 1016 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1017 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1018 sock->remote_rw); 1019 1020 /* Try to queue some I frames for transmission */ 1021 while (sock->remote_ready && 1022 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1023 struct sk_buff *pdu; 1024 1025 pdu = skb_dequeue(&sock->tx_queue); 1026 if (pdu == NULL) 1027 break; 1028 1029 /* Update N(S)/N(R) */ 1030 nfc_llcp_set_nrns(sock, pdu); 1031 1032 skb_queue_tail(&local->tx_queue, pdu); 1033 nr_frames++; 1034 } 1035 1036 return nr_frames; 1037 } 1038 1039 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1040 struct sk_buff *skb) 1041 { 1042 struct nfc_llcp_sock *llcp_sock; 1043 struct sock *sk; 1044 u8 dsap, ssap, ptype, ns, nr; 1045 1046 ptype = nfc_llcp_ptype(skb); 1047 dsap = nfc_llcp_dsap(skb); 1048 ssap = nfc_llcp_ssap(skb); 1049 ns = nfc_llcp_ns(skb); 1050 nr = nfc_llcp_nr(skb); 1051 1052 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1053 1054 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1055 if (llcp_sock == NULL) { 1056 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1057 return; 1058 } 1059 1060 sk = &llcp_sock->sk; 1061 lock_sock(sk); 1062 if (sk->sk_state == LLCP_CLOSED) { 1063 release_sock(sk); 1064 nfc_llcp_sock_put(llcp_sock); 1065 } 1066 1067 /* Pass the payload upstream */ 1068 if (ptype == LLCP_PDU_I) { 1069 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1070 1071 if (ns == llcp_sock->recv_n) 1072 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1073 else 1074 pr_err("Received out of sequence I PDU\n"); 1075 1076 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1077 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1078 /* 1079 * I frames will be freed from the socket layer, so we 1080 * need to keep them alive until someone receives them. 1081 */ 1082 skb_get(skb); 1083 } else { 1084 pr_err("Receive queue is full\n"); 1085 } 1086 } 1087 1088 /* Remove skbs from the pending queue */ 1089 if (llcp_sock->send_ack_n != nr) { 1090 struct sk_buff *s, *tmp; 1091 u8 n; 1092 1093 llcp_sock->send_ack_n = nr; 1094 1095 /* Remove and free all skbs until ns == nr */ 1096 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1097 n = nfc_llcp_ns(s); 1098 1099 skb_unlink(s, &llcp_sock->tx_pending_queue); 1100 kfree_skb(s); 1101 1102 if (n == nr) 1103 break; 1104 } 1105 1106 /* Re-queue the remaining skbs for transmission */ 1107 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1108 s, tmp) { 1109 skb_unlink(s, &llcp_sock->tx_pending_queue); 1110 skb_queue_head(&local->tx_queue, s); 1111 } 1112 } 1113 1114 if (ptype == LLCP_PDU_RR) 1115 llcp_sock->remote_ready = true; 1116 else if (ptype == LLCP_PDU_RNR) 1117 llcp_sock->remote_ready = false; 1118 1119 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1120 nfc_llcp_send_rr(llcp_sock); 1121 1122 release_sock(sk); 1123 nfc_llcp_sock_put(llcp_sock); 1124 } 1125 1126 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1127 struct sk_buff *skb) 1128 { 1129 struct nfc_llcp_sock *llcp_sock; 1130 struct sock *sk; 1131 u8 dsap, ssap; 1132 1133 dsap = nfc_llcp_dsap(skb); 1134 ssap = nfc_llcp_ssap(skb); 1135 1136 if ((dsap == 0) && (ssap == 0)) { 1137 pr_debug("Connection termination"); 1138 nfc_dep_link_down(local->dev); 1139 return; 1140 } 1141 1142 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1143 if (llcp_sock == NULL) { 1144 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1145 return; 1146 } 1147 1148 sk = &llcp_sock->sk; 1149 lock_sock(sk); 1150 1151 nfc_llcp_socket_purge(llcp_sock); 1152 1153 if (sk->sk_state == LLCP_CLOSED) { 1154 release_sock(sk); 1155 nfc_llcp_sock_put(llcp_sock); 1156 } 1157 1158 if (sk->sk_state == LLCP_CONNECTED) { 1159 nfc_put_device(local->dev); 1160 sk->sk_state = LLCP_CLOSED; 1161 sk->sk_state_change(sk); 1162 } 1163 1164 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1165 1166 release_sock(sk); 1167 nfc_llcp_sock_put(llcp_sock); 1168 } 1169 1170 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) 1171 { 1172 struct nfc_llcp_sock *llcp_sock; 1173 struct sock *sk; 1174 u8 dsap, ssap; 1175 1176 dsap = nfc_llcp_dsap(skb); 1177 ssap = nfc_llcp_ssap(skb); 1178 1179 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1180 if (llcp_sock == NULL) { 1181 pr_err("Invalid CC\n"); 1182 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1183 1184 return; 1185 } 1186 1187 sk = &llcp_sock->sk; 1188 1189 /* Unlink from connecting and link to the client array */ 1190 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1191 nfc_llcp_sock_link(&local->sockets, sk); 1192 llcp_sock->dsap = ssap; 1193 1194 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1195 skb->len - LLCP_HEADER_SIZE); 1196 1197 sk->sk_state = LLCP_CONNECTED; 1198 sk->sk_state_change(sk); 1199 1200 nfc_llcp_sock_put(llcp_sock); 1201 } 1202 1203 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) 1204 { 1205 struct nfc_llcp_sock *llcp_sock; 1206 struct sock *sk; 1207 u8 dsap, ssap, reason; 1208 1209 dsap = nfc_llcp_dsap(skb); 1210 ssap = nfc_llcp_ssap(skb); 1211 reason = skb->data[2]; 1212 1213 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1214 1215 switch (reason) { 1216 case LLCP_DM_NOBOUND: 1217 case LLCP_DM_REJ: 1218 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1219 break; 1220 1221 default: 1222 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1223 break; 1224 } 1225 1226 if (llcp_sock == NULL) { 1227 pr_debug("Already closed\n"); 1228 return; 1229 } 1230 1231 sk = &llcp_sock->sk; 1232 1233 sk->sk_err = ENXIO; 1234 sk->sk_state = LLCP_CLOSED; 1235 sk->sk_state_change(sk); 1236 1237 nfc_llcp_sock_put(llcp_sock); 1238 } 1239 1240 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1241 struct sk_buff *skb) 1242 { 1243 struct nfc_llcp_sock *llcp_sock; 1244 u8 dsap, ssap, *tlv, type, length, tid, sap; 1245 u16 tlv_len, offset; 1246 char *service_name; 1247 size_t service_name_len; 1248 struct nfc_llcp_sdp_tlv *sdp; 1249 HLIST_HEAD(llc_sdres_list); 1250 size_t sdres_tlvs_len; 1251 HLIST_HEAD(nl_sdres_list); 1252 1253 dsap = nfc_llcp_dsap(skb); 1254 ssap = nfc_llcp_ssap(skb); 1255 1256 pr_debug("%d %d\n", dsap, ssap); 1257 1258 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1259 pr_err("Wrong SNL SAP\n"); 1260 return; 1261 } 1262 1263 tlv = &skb->data[LLCP_HEADER_SIZE]; 1264 tlv_len = skb->len - LLCP_HEADER_SIZE; 1265 offset = 0; 1266 sdres_tlvs_len = 0; 1267 1268 while (offset < tlv_len) { 1269 type = tlv[0]; 1270 length = tlv[1]; 1271 1272 switch (type) { 1273 case LLCP_TLV_SDREQ: 1274 tid = tlv[2]; 1275 service_name = (char *) &tlv[3]; 1276 service_name_len = length - 1; 1277 1278 pr_debug("Looking for %.16s\n", service_name); 1279 1280 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1281 !strncmp(service_name, "urn:nfc:sn:sdp", 1282 service_name_len)) { 1283 sap = 1; 1284 goto add_snl; 1285 } 1286 1287 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1288 service_name_len); 1289 if (!llcp_sock) { 1290 sap = 0; 1291 goto add_snl; 1292 } 1293 1294 /* 1295 * We found a socket but its ssap has not been reserved 1296 * yet. We need to assign it for good and send a reply. 1297 * The ssap will be freed when the socket is closed. 1298 */ 1299 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1300 atomic_t *client_count; 1301 1302 sap = nfc_llcp_reserve_sdp_ssap(local); 1303 1304 pr_debug("Reserving %d\n", sap); 1305 1306 if (sap == LLCP_SAP_MAX) { 1307 sap = 0; 1308 goto add_snl; 1309 } 1310 1311 client_count = 1312 &local->local_sdp_cnt[sap - 1313 LLCP_WKS_NUM_SAP]; 1314 1315 atomic_inc(client_count); 1316 1317 llcp_sock->ssap = sap; 1318 llcp_sock->reserved_ssap = sap; 1319 } else { 1320 sap = llcp_sock->ssap; 1321 } 1322 1323 pr_debug("%p %d\n", llcp_sock, sap); 1324 1325 add_snl: 1326 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1327 if (sdp == NULL) 1328 goto exit; 1329 1330 sdres_tlvs_len += sdp->tlv_len; 1331 hlist_add_head(&sdp->node, &llc_sdres_list); 1332 break; 1333 1334 case LLCP_TLV_SDRES: 1335 mutex_lock(&local->sdreq_lock); 1336 1337 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1338 1339 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1340 if (sdp->tid != tlv[2]) 1341 continue; 1342 1343 sdp->sap = tlv[3]; 1344 1345 pr_debug("Found: uri=%s, sap=%d\n", 1346 sdp->uri, sdp->sap); 1347 1348 hlist_del(&sdp->node); 1349 1350 hlist_add_head(&sdp->node, &nl_sdres_list); 1351 1352 break; 1353 } 1354 1355 mutex_unlock(&local->sdreq_lock); 1356 break; 1357 1358 default: 1359 pr_err("Invalid SNL tlv value 0x%x\n", type); 1360 break; 1361 } 1362 1363 offset += length + 2; 1364 tlv += length + 2; 1365 } 1366 1367 exit: 1368 if (!hlist_empty(&nl_sdres_list)) 1369 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1370 1371 if (!hlist_empty(&llc_sdres_list)) 1372 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1373 } 1374 1375 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1376 { 1377 u8 ptype; 1378 u16 pdu_len; 1379 struct sk_buff *new_skb; 1380 1381 if (skb->len <= LLCP_HEADER_SIZE) { 1382 pr_err("Malformed AGF PDU\n"); 1383 return; 1384 } 1385 1386 skb_pull(skb, LLCP_HEADER_SIZE); 1387 1388 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1389 pdu_len = skb->data[0] << 8 | skb->data[1]; 1390 1391 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1392 1393 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1394 pr_err("Malformed AGF PDU\n"); 1395 return; 1396 } 1397 1398 ptype = nfc_llcp_ptype(skb); 1399 1400 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1401 goto next; 1402 1403 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1404 if (new_skb == NULL) { 1405 pr_err("Could not allocate PDU\n"); 1406 return; 1407 } 1408 1409 skb_put_data(new_skb, skb->data, pdu_len); 1410 1411 nfc_llcp_rx_skb(local, new_skb); 1412 1413 kfree_skb(new_skb); 1414 next: 1415 skb_pull(skb, pdu_len); 1416 } 1417 } 1418 1419 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1420 { 1421 u8 dsap, ssap, ptype; 1422 1423 ptype = nfc_llcp_ptype(skb); 1424 dsap = nfc_llcp_dsap(skb); 1425 ssap = nfc_llcp_ssap(skb); 1426 1427 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1428 1429 if (ptype != LLCP_PDU_SYMM) 1430 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1, 1431 skb->data, skb->len, true); 1432 1433 switch (ptype) { 1434 case LLCP_PDU_SYMM: 1435 pr_debug("SYMM\n"); 1436 break; 1437 1438 case LLCP_PDU_UI: 1439 pr_debug("UI\n"); 1440 nfc_llcp_recv_ui(local, skb); 1441 break; 1442 1443 case LLCP_PDU_CONNECT: 1444 pr_debug("CONNECT\n"); 1445 nfc_llcp_recv_connect(local, skb); 1446 break; 1447 1448 case LLCP_PDU_DISC: 1449 pr_debug("DISC\n"); 1450 nfc_llcp_recv_disc(local, skb); 1451 break; 1452 1453 case LLCP_PDU_CC: 1454 pr_debug("CC\n"); 1455 nfc_llcp_recv_cc(local, skb); 1456 break; 1457 1458 case LLCP_PDU_DM: 1459 pr_debug("DM\n"); 1460 nfc_llcp_recv_dm(local, skb); 1461 break; 1462 1463 case LLCP_PDU_SNL: 1464 pr_debug("SNL\n"); 1465 nfc_llcp_recv_snl(local, skb); 1466 break; 1467 1468 case LLCP_PDU_I: 1469 case LLCP_PDU_RR: 1470 case LLCP_PDU_RNR: 1471 pr_debug("I frame\n"); 1472 nfc_llcp_recv_hdlc(local, skb); 1473 break; 1474 1475 case LLCP_PDU_AGF: 1476 pr_debug("AGF frame\n"); 1477 nfc_llcp_recv_agf(local, skb); 1478 break; 1479 } 1480 } 1481 1482 static void nfc_llcp_rx_work(struct work_struct *work) 1483 { 1484 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1485 rx_work); 1486 struct sk_buff *skb; 1487 1488 skb = local->rx_pending; 1489 if (skb == NULL) { 1490 pr_debug("No pending SKB\n"); 1491 return; 1492 } 1493 1494 __net_timestamp(skb); 1495 1496 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX); 1497 1498 nfc_llcp_rx_skb(local, skb); 1499 1500 schedule_work(&local->tx_work); 1501 kfree_skb(local->rx_pending); 1502 local->rx_pending = NULL; 1503 } 1504 1505 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1506 { 1507 local->rx_pending = skb; 1508 del_timer(&local->link_timer); 1509 schedule_work(&local->rx_work); 1510 } 1511 1512 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1513 { 1514 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1515 1516 pr_debug("Received an LLCP PDU\n"); 1517 if (err < 0) { 1518 pr_err("err %d\n", err); 1519 return; 1520 } 1521 1522 __nfc_llcp_recv(local, skb); 1523 } 1524 1525 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1526 { 1527 struct nfc_llcp_local *local; 1528 1529 local = nfc_llcp_find_local(dev); 1530 if (local == NULL) { 1531 kfree_skb(skb); 1532 return -ENODEV; 1533 } 1534 1535 __nfc_llcp_recv(local, skb); 1536 1537 return 0; 1538 } 1539 1540 void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1541 { 1542 struct nfc_llcp_local *local; 1543 1544 local = nfc_llcp_find_local(dev); 1545 if (local == NULL) 1546 return; 1547 1548 local->remote_miu = LLCP_DEFAULT_MIU; 1549 local->remote_lto = LLCP_DEFAULT_LTO; 1550 1551 /* Close and purge all existing sockets */ 1552 nfc_llcp_socket_release(local, true, 0); 1553 } 1554 1555 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1556 u8 comm_mode, u8 rf_mode) 1557 { 1558 struct nfc_llcp_local *local; 1559 1560 pr_debug("rf mode %d\n", rf_mode); 1561 1562 local = nfc_llcp_find_local(dev); 1563 if (local == NULL) 1564 return; 1565 1566 local->target_idx = target_idx; 1567 local->comm_mode = comm_mode; 1568 local->rf_mode = rf_mode; 1569 1570 if (rf_mode == NFC_RF_INITIATOR) { 1571 pr_debug("Queueing Tx work\n"); 1572 1573 schedule_work(&local->tx_work); 1574 } else { 1575 mod_timer(&local->link_timer, 1576 jiffies + msecs_to_jiffies(local->remote_lto)); 1577 } 1578 } 1579 1580 int nfc_llcp_register_device(struct nfc_dev *ndev) 1581 { 1582 struct nfc_llcp_local *local; 1583 1584 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1585 if (local == NULL) 1586 return -ENOMEM; 1587 1588 local->dev = ndev; 1589 INIT_LIST_HEAD(&local->list); 1590 kref_init(&local->ref); 1591 mutex_init(&local->sdp_lock); 1592 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0); 1593 1594 skb_queue_head_init(&local->tx_queue); 1595 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1596 1597 local->rx_pending = NULL; 1598 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1599 1600 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1601 1602 rwlock_init(&local->sockets.lock); 1603 rwlock_init(&local->connecting_sockets.lock); 1604 rwlock_init(&local->raw_sockets.lock); 1605 1606 local->lto = 150; /* 1500 ms */ 1607 local->rw = LLCP_MAX_RW; 1608 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1609 local->local_wks = 0x1; /* LLC Link Management */ 1610 1611 nfc_llcp_build_gb(local); 1612 1613 local->remote_miu = LLCP_DEFAULT_MIU; 1614 local->remote_lto = LLCP_DEFAULT_LTO; 1615 1616 mutex_init(&local->sdreq_lock); 1617 INIT_HLIST_HEAD(&local->pending_sdreqs); 1618 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0); 1619 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1620 1621 list_add(&local->list, &llcp_devices); 1622 1623 return 0; 1624 } 1625 1626 void nfc_llcp_unregister_device(struct nfc_dev *dev) 1627 { 1628 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 1629 1630 if (local == NULL) { 1631 pr_debug("No such device\n"); 1632 return; 1633 } 1634 1635 local_cleanup(local); 1636 1637 nfc_llcp_local_put(local); 1638 } 1639 1640 int __init nfc_llcp_init(void) 1641 { 1642 return nfc_llcp_sock_init(); 1643 } 1644 1645 void nfc_llcp_exit(void) 1646 { 1647 nfc_llcp_sock_exit(); 1648 } 1649