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 29static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; 30 31static LIST_HEAD(llcp_devices); 32 33static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb); 34 35void 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 42void 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 49void 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 55static 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 78static 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 158struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) 159{ 160 kref_get(&local->ref); 161 162 return local; 163} 164 165static 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 179static 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 190int 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 198static 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 232static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) 233{ 234 sock_put(&sock->sk); 235} 236 237static 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 245static void nfc_llcp_symm_timer(unsigned long data) 246{ 247 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 248 249 pr_err("SYMM timeout\n"); 250 251 schedule_work(&local->timeout_work); 252} 253 254static 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 288static void nfc_llcp_sdreq_timer(unsigned long data) 289{ 290 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 291 292 schedule_work(&local->sdreq_timeout_work); 293} 294 295struct 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 308static char *wks[] = { 309 NULL, 310 NULL, /* SDP */ 311 "urn:nfc:sn:ip", 312 "urn:nfc:sn:obex", 313 "urn:nfc:sn:snep", 314}; 315 316static 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 338static 339struct 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 387u8 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 441u8 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 460void 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 511static 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 533static int nfc_llcp_build_gb(struct nfc_llcp_local *local) 534{ 535 u8 *gb_cur, *version_tlv, version, version_length; 536 u8 *lto_tlv, lto_length; 537 u8 *wks_tlv, wks_length; 538 u8 *miux_tlv, miux_length; 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 gb_len += version_length; 547 548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); 549 gb_len += lto_length; 550 551 pr_debug("Local wks 0x%lx\n", local->local_wks); 552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length); 553 gb_len += wks_length; 554 555 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, 556 &miux_length); 557 gb_len += miux_length; 558 559 gb_len += ARRAY_SIZE(llcp_magic); 560 561 if (gb_len > NFC_MAX_GT_LEN) { 562 ret = -EINVAL; 563 goto out; 564 } 565 566 gb_cur = local->gb; 567 568 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); 569 gb_cur += ARRAY_SIZE(llcp_magic); 570 571 memcpy(gb_cur, version_tlv, version_length); 572 gb_cur += version_length; 573 574 memcpy(gb_cur, lto_tlv, lto_length); 575 gb_cur += lto_length; 576 577 memcpy(gb_cur, wks_tlv, wks_length); 578 gb_cur += wks_length; 579 580 memcpy(gb_cur, miux_tlv, miux_length); 581 gb_cur += miux_length; 582 583 local->gb_len = gb_len; 584 585out: 586 kfree(version_tlv); 587 kfree(lto_tlv); 588 kfree(wks_tlv); 589 kfree(miux_tlv); 590 591 return ret; 592} 593 594u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) 595{ 596 struct nfc_llcp_local *local; 597 598 local = nfc_llcp_find_local(dev); 599 if (local == NULL) { 600 *general_bytes_len = 0; 601 return NULL; 602 } 603 604 nfc_llcp_build_gb(local); 605 606 *general_bytes_len = local->gb_len; 607 608 return local->gb; 609} 610 611int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) 612{ 613 struct nfc_llcp_local *local; 614 615 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN) 616 return -EINVAL; 617 618 local = nfc_llcp_find_local(dev); 619 if (local == NULL) { 620 pr_err("No LLCP device\n"); 621 return -ENODEV; 622 } 623 624 memset(local->remote_gb, 0, NFC_MAX_GT_LEN); 625 memcpy(local->remote_gb, gb, gb_len); 626 local->remote_gb_len = gb_len; 627 628 if (memcmp(local->remote_gb, llcp_magic, 3)) { 629 pr_err("MAC does not support LLCP\n"); 630 return -EINVAL; 631 } 632 633 return nfc_llcp_parse_gb_tlv(local, 634 &local->remote_gb[3], 635 local->remote_gb_len - 3); 636} 637 638static u8 nfc_llcp_dsap(struct sk_buff *pdu) 639{ 640 return (pdu->data[0] & 0xfc) >> 2; 641} 642 643static u8 nfc_llcp_ptype(struct sk_buff *pdu) 644{ 645 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); 646} 647 648static u8 nfc_llcp_ssap(struct sk_buff *pdu) 649{ 650 return pdu->data[1] & 0x3f; 651} 652 653static u8 nfc_llcp_ns(struct sk_buff *pdu) 654{ 655 return pdu->data[2] >> 4; 656} 657 658static u8 nfc_llcp_nr(struct sk_buff *pdu) 659{ 660 return pdu->data[2] & 0xf; 661} 662 663static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) 664{ 665 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); 666 sock->send_n = (sock->send_n + 1) % 16; 667 sock->recv_ack_n = (sock->recv_n - 1) % 16; 668} 669 670void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, 671 struct sk_buff *skb, u8 direction) 672{ 673 struct sk_buff *skb_copy = NULL, *nskb; 674 struct sock *sk; 675 u8 *data; 676 677 read_lock(&local->raw_sockets.lock); 678 679 sk_for_each(sk, &local->raw_sockets.head) { 680 if (sk->sk_state != LLCP_BOUND) 681 continue; 682 683 if (skb_copy == NULL) { 684 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE, 685 GFP_ATOMIC, true); 686 687 if (skb_copy == NULL) 688 continue; 689 690 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE); 691 692 data[0] = local->dev ? local->dev->idx : 0xFF; 693 data[1] = direction & 0x01; 694 data[1] |= (RAW_PAYLOAD_LLCP << 1); 695 } 696 697 nskb = skb_clone(skb_copy, GFP_ATOMIC); 698 if (!nskb) 699 continue; 700 701 if (sock_queue_rcv_skb(sk, nskb)) 702 kfree_skb(nskb); 703 } 704 705 read_unlock(&local->raw_sockets.lock); 706 707 kfree_skb(skb_copy); 708} 709 710static void nfc_llcp_tx_work(struct work_struct *work) 711{ 712 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 713 tx_work); 714 struct sk_buff *skb; 715 struct sock *sk; 716 struct nfc_llcp_sock *llcp_sock; 717 718 skb = skb_dequeue(&local->tx_queue); 719 if (skb != NULL) { 720 sk = skb->sk; 721 llcp_sock = nfc_llcp_sock(sk); 722 723 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { 724 kfree_skb(skb); 725 nfc_llcp_send_symm(local->dev); 726 } else if (llcp_sock && !llcp_sock->remote_ready) { 727 skb_queue_head(&local->tx_queue, skb); 728 nfc_llcp_send_symm(local->dev); 729 } else { 730 struct sk_buff *copy_skb = NULL; 731 u8 ptype = nfc_llcp_ptype(skb); 732 int ret; 733 734 pr_debug("Sending pending skb\n"); 735 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", 736 DUMP_PREFIX_OFFSET, 16, 1, 737 skb->data, skb->len, true); 738 739 if (ptype == LLCP_PDU_DISC && sk != NULL && 740 sk->sk_state == LLCP_DISCONNECTING) { 741 nfc_llcp_sock_unlink(&local->sockets, sk); 742 sock_orphan(sk); 743 sock_put(sk); 744 } 745 746 if (ptype == LLCP_PDU_I) 747 copy_skb = skb_copy(skb, GFP_ATOMIC); 748 749 __net_timestamp(skb); 750 751 nfc_llcp_send_to_raw_sock(local, skb, 752 NFC_DIRECTION_TX); 753 754 ret = nfc_data_exchange(local->dev, local->target_idx, 755 skb, nfc_llcp_recv, local); 756 757 if (ret) { 758 kfree_skb(copy_skb); 759 goto out; 760 } 761 762 if (ptype == LLCP_PDU_I && copy_skb) 763 skb_queue_tail(&llcp_sock->tx_pending_queue, 764 copy_skb); 765 } 766 } else { 767 nfc_llcp_send_symm(local->dev); 768 } 769 770out: 771 mod_timer(&local->link_timer, 772 jiffies + msecs_to_jiffies(2 * local->remote_lto)); 773} 774 775static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, 776 u8 ssap) 777{ 778 struct sock *sk; 779 struct nfc_llcp_sock *llcp_sock; 780 781 read_lock(&local->connecting_sockets.lock); 782 783 sk_for_each(sk, &local->connecting_sockets.head) { 784 llcp_sock = nfc_llcp_sock(sk); 785 786 if (llcp_sock->ssap == ssap) { 787 sock_hold(&llcp_sock->sk); 788 goto out; 789 } 790 } 791 792 llcp_sock = NULL; 793 794out: 795 read_unlock(&local->connecting_sockets.lock); 796 797 return llcp_sock; 798} 799 800static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, 801 u8 *sn, size_t sn_len) 802{ 803 struct nfc_llcp_sock *llcp_sock; 804 805 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); 806 807 if (llcp_sock == NULL) 808 return NULL; 809 810 sock_hold(&llcp_sock->sk); 811 812 return llcp_sock; 813} 814 815static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 816{ 817 u8 *tlv = &skb->data[2], type, length; 818 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; 819 820 while (offset < tlv_array_len) { 821 type = tlv[0]; 822 length = tlv[1]; 823 824 pr_debug("type 0x%x length %d\n", type, length); 825 826 if (type == LLCP_TLV_SN) { 827 *sn_len = length; 828 return &tlv[2]; 829 } 830 831 offset += length + 2; 832 tlv += length + 2; 833 } 834 835 return NULL; 836} 837 838static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, 839 struct sk_buff *skb) 840{ 841 struct nfc_llcp_sock *llcp_sock; 842 struct nfc_llcp_ui_cb *ui_cb; 843 u8 dsap, ssap; 844 845 dsap = nfc_llcp_dsap(skb); 846 ssap = nfc_llcp_ssap(skb); 847 848 ui_cb = nfc_llcp_ui_skb_cb(skb); 849 ui_cb->dsap = dsap; 850 ui_cb->ssap = ssap; 851 852 pr_debug("%d %d\n", dsap, ssap); 853 854 /* We're looking for a bound socket, not a client one */ 855 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 856 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) 857 return; 858 859 /* There is no sequence with UI frames */ 860 skb_pull(skb, LLCP_HEADER_SIZE); 861 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 862 /* 863 * UI frames will be freed from the socket layer, so we 864 * need to keep them alive until someone receives them. 865 */ 866 skb_get(skb); 867 } else { 868 pr_err("Receive queue is full\n"); 869 } 870 871 nfc_llcp_sock_put(llcp_sock); 872} 873 874static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, 875 struct sk_buff *skb) 876{ 877 struct sock *new_sk, *parent; 878 struct nfc_llcp_sock *sock, *new_sock; 879 u8 dsap, ssap, reason; 880 881 dsap = nfc_llcp_dsap(skb); 882 ssap = nfc_llcp_ssap(skb); 883 884 pr_debug("%d %d\n", dsap, ssap); 885 886 if (dsap != LLCP_SAP_SDP) { 887 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); 888 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { 889 reason = LLCP_DM_NOBOUND; 890 goto fail; 891 } 892 } else { 893 u8 *sn; 894 size_t sn_len; 895 896 sn = nfc_llcp_connect_sn(skb, &sn_len); 897 if (sn == NULL) { 898 reason = LLCP_DM_NOBOUND; 899 goto fail; 900 } 901 902 pr_debug("Service name length %zu\n", sn_len); 903 904 sock = nfc_llcp_sock_get_sn(local, sn, sn_len); 905 if (sock == NULL) { 906 reason = LLCP_DM_NOBOUND; 907 goto fail; 908 } 909 } 910 911 lock_sock(&sock->sk); 912 913 parent = &sock->sk; 914 915 if (sk_acceptq_is_full(parent)) { 916 reason = LLCP_DM_REJ; 917 release_sock(&sock->sk); 918 sock_put(&sock->sk); 919 goto fail; 920 } 921 922 if (sock->ssap == LLCP_SDP_UNBOUND) { 923 u8 ssap = nfc_llcp_reserve_sdp_ssap(local); 924 925 pr_debug("First client, reserving %d\n", ssap); 926 927 if (ssap == LLCP_SAP_MAX) { 928 reason = LLCP_DM_REJ; 929 release_sock(&sock->sk); 930 sock_put(&sock->sk); 931 goto fail; 932 } 933 934 sock->ssap = ssap; 935 } 936 937 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); 938 if (new_sk == NULL) { 939 reason = LLCP_DM_REJ; 940 release_sock(&sock->sk); 941 sock_put(&sock->sk); 942 goto fail; 943 } 944 945 new_sock = nfc_llcp_sock(new_sk); 946 new_sock->dev = local->dev; 947 new_sock->local = nfc_llcp_local_get(local); 948 new_sock->rw = sock->rw; 949 new_sock->miux = sock->miux; 950 new_sock->nfc_protocol = sock->nfc_protocol; 951 new_sock->dsap = ssap; 952 new_sock->target_idx = local->target_idx; 953 new_sock->parent = parent; 954 new_sock->ssap = sock->ssap; 955 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { 956 atomic_t *client_count; 957 958 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); 959 960 client_count = 961 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; 962 963 atomic_inc(client_count); 964 new_sock->reserved_ssap = sock->ssap; 965 } 966 967 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], 968 skb->len - LLCP_HEADER_SIZE); 969 970 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); 971 972 nfc_llcp_sock_link(&local->sockets, new_sk); 973 974 nfc_llcp_accept_enqueue(&sock->sk, new_sk); 975 976 nfc_get_device(local->dev->idx); 977 978 new_sk->sk_state = LLCP_CONNECTED; 979 980 /* Wake the listening processes */ 981 parent->sk_data_ready(parent); 982 983 /* Send CC */ 984 nfc_llcp_send_cc(new_sock); 985 986 release_sock(&sock->sk); 987 sock_put(&sock->sk); 988 989 return; 990 991fail: 992 /* Send DM */ 993 nfc_llcp_send_dm(local, dsap, ssap, reason); 994} 995 996int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) 997{ 998 int nr_frames = 0; 999 struct nfc_llcp_local *local = sock->local; 1000 1001 pr_debug("Remote ready %d tx queue len %d remote rw %d", 1002 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), 1003 sock->remote_rw); 1004 1005 /* Try to queue some I frames for transmission */ 1006 while (sock->remote_ready && 1007 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) { 1008 struct sk_buff *pdu; 1009 1010 pdu = skb_dequeue(&sock->tx_queue); 1011 if (pdu == NULL) 1012 break; 1013 1014 /* Update N(S)/N(R) */ 1015 nfc_llcp_set_nrns(sock, pdu); 1016 1017 skb_queue_tail(&local->tx_queue, pdu); 1018 nr_frames++; 1019 } 1020 1021 return nr_frames; 1022} 1023 1024static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, 1025 struct sk_buff *skb) 1026{ 1027 struct nfc_llcp_sock *llcp_sock; 1028 struct sock *sk; 1029 u8 dsap, ssap, ptype, ns, nr; 1030 1031 ptype = nfc_llcp_ptype(skb); 1032 dsap = nfc_llcp_dsap(skb); 1033 ssap = nfc_llcp_ssap(skb); 1034 ns = nfc_llcp_ns(skb); 1035 nr = nfc_llcp_nr(skb); 1036 1037 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); 1038 1039 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1040 if (llcp_sock == NULL) { 1041 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1042 return; 1043 } 1044 1045 sk = &llcp_sock->sk; 1046 lock_sock(sk); 1047 if (sk->sk_state == LLCP_CLOSED) { 1048 release_sock(sk); 1049 nfc_llcp_sock_put(llcp_sock); 1050 } 1051 1052 /* Pass the payload upstream */ 1053 if (ptype == LLCP_PDU_I) { 1054 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); 1055 1056 if (ns == llcp_sock->recv_n) 1057 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; 1058 else 1059 pr_err("Received out of sequence I PDU\n"); 1060 1061 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); 1062 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { 1063 /* 1064 * I frames will be freed from the socket layer, so we 1065 * need to keep them alive until someone receives them. 1066 */ 1067 skb_get(skb); 1068 } else { 1069 pr_err("Receive queue is full\n"); 1070 } 1071 } 1072 1073 /* Remove skbs from the pending queue */ 1074 if (llcp_sock->send_ack_n != nr) { 1075 struct sk_buff *s, *tmp; 1076 u8 n; 1077 1078 llcp_sock->send_ack_n = nr; 1079 1080 /* Remove and free all skbs until ns == nr */ 1081 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { 1082 n = nfc_llcp_ns(s); 1083 1084 skb_unlink(s, &llcp_sock->tx_pending_queue); 1085 kfree_skb(s); 1086 1087 if (n == nr) 1088 break; 1089 } 1090 1091 /* Re-queue the remaining skbs for transmission */ 1092 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, 1093 s, tmp) { 1094 skb_unlink(s, &llcp_sock->tx_pending_queue); 1095 skb_queue_head(&local->tx_queue, s); 1096 } 1097 } 1098 1099 if (ptype == LLCP_PDU_RR) 1100 llcp_sock->remote_ready = true; 1101 else if (ptype == LLCP_PDU_RNR) 1102 llcp_sock->remote_ready = false; 1103 1104 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) 1105 nfc_llcp_send_rr(llcp_sock); 1106 1107 release_sock(sk); 1108 nfc_llcp_sock_put(llcp_sock); 1109} 1110 1111static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, 1112 struct sk_buff *skb) 1113{ 1114 struct nfc_llcp_sock *llcp_sock; 1115 struct sock *sk; 1116 u8 dsap, ssap; 1117 1118 dsap = nfc_llcp_dsap(skb); 1119 ssap = nfc_llcp_ssap(skb); 1120 1121 if ((dsap == 0) && (ssap == 0)) { 1122 pr_debug("Connection termination"); 1123 nfc_dep_link_down(local->dev); 1124 return; 1125 } 1126 1127 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1128 if (llcp_sock == NULL) { 1129 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1130 return; 1131 } 1132 1133 sk = &llcp_sock->sk; 1134 lock_sock(sk); 1135 1136 nfc_llcp_socket_purge(llcp_sock); 1137 1138 if (sk->sk_state == LLCP_CLOSED) { 1139 release_sock(sk); 1140 nfc_llcp_sock_put(llcp_sock); 1141 } 1142 1143 if (sk->sk_state == LLCP_CONNECTED) { 1144 nfc_put_device(local->dev); 1145 sk->sk_state = LLCP_CLOSED; 1146 sk->sk_state_change(sk); 1147 } 1148 1149 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); 1150 1151 release_sock(sk); 1152 nfc_llcp_sock_put(llcp_sock); 1153} 1154 1155static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) 1156{ 1157 struct nfc_llcp_sock *llcp_sock; 1158 struct sock *sk; 1159 u8 dsap, ssap; 1160 1161 dsap = nfc_llcp_dsap(skb); 1162 ssap = nfc_llcp_ssap(skb); 1163 1164 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1165 if (llcp_sock == NULL) { 1166 pr_err("Invalid CC\n"); 1167 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); 1168 1169 return; 1170 } 1171 1172 sk = &llcp_sock->sk; 1173 1174 /* Unlink from connecting and link to the client array */ 1175 nfc_llcp_sock_unlink(&local->connecting_sockets, sk); 1176 nfc_llcp_sock_link(&local->sockets, sk); 1177 llcp_sock->dsap = ssap; 1178 1179 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], 1180 skb->len - LLCP_HEADER_SIZE); 1181 1182 sk->sk_state = LLCP_CONNECTED; 1183 sk->sk_state_change(sk); 1184 1185 nfc_llcp_sock_put(llcp_sock); 1186} 1187 1188static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) 1189{ 1190 struct nfc_llcp_sock *llcp_sock; 1191 struct sock *sk; 1192 u8 dsap, ssap, reason; 1193 1194 dsap = nfc_llcp_dsap(skb); 1195 ssap = nfc_llcp_ssap(skb); 1196 reason = skb->data[2]; 1197 1198 pr_debug("%d %d reason %d\n", ssap, dsap, reason); 1199 1200 switch (reason) { 1201 case LLCP_DM_NOBOUND: 1202 case LLCP_DM_REJ: 1203 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); 1204 break; 1205 1206 default: 1207 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); 1208 break; 1209 } 1210 1211 if (llcp_sock == NULL) { 1212 pr_debug("Already closed\n"); 1213 return; 1214 } 1215 1216 sk = &llcp_sock->sk; 1217 1218 sk->sk_err = ENXIO; 1219 sk->sk_state = LLCP_CLOSED; 1220 sk->sk_state_change(sk); 1221 1222 nfc_llcp_sock_put(llcp_sock); 1223} 1224 1225static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, 1226 struct sk_buff *skb) 1227{ 1228 struct nfc_llcp_sock *llcp_sock; 1229 u8 dsap, ssap, *tlv, type, length, tid, sap; 1230 u16 tlv_len, offset; 1231 char *service_name; 1232 size_t service_name_len; 1233 struct nfc_llcp_sdp_tlv *sdp; 1234 HLIST_HEAD(llc_sdres_list); 1235 size_t sdres_tlvs_len; 1236 HLIST_HEAD(nl_sdres_list); 1237 1238 dsap = nfc_llcp_dsap(skb); 1239 ssap = nfc_llcp_ssap(skb); 1240 1241 pr_debug("%d %d\n", dsap, ssap); 1242 1243 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { 1244 pr_err("Wrong SNL SAP\n"); 1245 return; 1246 } 1247 1248 tlv = &skb->data[LLCP_HEADER_SIZE]; 1249 tlv_len = skb->len - LLCP_HEADER_SIZE; 1250 offset = 0; 1251 sdres_tlvs_len = 0; 1252 1253 while (offset < tlv_len) { 1254 type = tlv[0]; 1255 length = tlv[1]; 1256 1257 switch (type) { 1258 case LLCP_TLV_SDREQ: 1259 tid = tlv[2]; 1260 service_name = (char *) &tlv[3]; 1261 service_name_len = length - 1; 1262 1263 pr_debug("Looking for %.16s\n", service_name); 1264 1265 if (service_name_len == strlen("urn:nfc:sn:sdp") && 1266 !strncmp(service_name, "urn:nfc:sn:sdp", 1267 service_name_len)) { 1268 sap = 1; 1269 goto add_snl; 1270 } 1271 1272 llcp_sock = nfc_llcp_sock_from_sn(local, service_name, 1273 service_name_len); 1274 if (!llcp_sock) { 1275 sap = 0; 1276 goto add_snl; 1277 } 1278 1279 /* 1280 * We found a socket but its ssap has not been reserved 1281 * yet. We need to assign it for good and send a reply. 1282 * The ssap will be freed when the socket is closed. 1283 */ 1284 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { 1285 atomic_t *client_count; 1286 1287 sap = nfc_llcp_reserve_sdp_ssap(local); 1288 1289 pr_debug("Reserving %d\n", sap); 1290 1291 if (sap == LLCP_SAP_MAX) { 1292 sap = 0; 1293 goto add_snl; 1294 } 1295 1296 client_count = 1297 &local->local_sdp_cnt[sap - 1298 LLCP_WKS_NUM_SAP]; 1299 1300 atomic_inc(client_count); 1301 1302 llcp_sock->ssap = sap; 1303 llcp_sock->reserved_ssap = sap; 1304 } else { 1305 sap = llcp_sock->ssap; 1306 } 1307 1308 pr_debug("%p %d\n", llcp_sock, sap); 1309 1310add_snl: 1311 sdp = nfc_llcp_build_sdres_tlv(tid, sap); 1312 if (sdp == NULL) 1313 goto exit; 1314 1315 sdres_tlvs_len += sdp->tlv_len; 1316 hlist_add_head(&sdp->node, &llc_sdres_list); 1317 break; 1318 1319 case LLCP_TLV_SDRES: 1320 mutex_lock(&local->sdreq_lock); 1321 1322 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]); 1323 1324 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) { 1325 if (sdp->tid != tlv[2]) 1326 continue; 1327 1328 sdp->sap = tlv[3]; 1329 1330 pr_debug("Found: uri=%s, sap=%d\n", 1331 sdp->uri, sdp->sap); 1332 1333 hlist_del(&sdp->node); 1334 1335 hlist_add_head(&sdp->node, &nl_sdres_list); 1336 1337 break; 1338 } 1339 1340 mutex_unlock(&local->sdreq_lock); 1341 break; 1342 1343 default: 1344 pr_err("Invalid SNL tlv value 0x%x\n", type); 1345 break; 1346 } 1347 1348 offset += length + 2; 1349 tlv += length + 2; 1350 } 1351 1352exit: 1353 if (!hlist_empty(&nl_sdres_list)) 1354 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list); 1355 1356 if (!hlist_empty(&llc_sdres_list)) 1357 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len); 1358} 1359 1360static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb) 1361{ 1362 u8 ptype; 1363 u16 pdu_len; 1364 struct sk_buff *new_skb; 1365 1366 if (skb->len <= LLCP_HEADER_SIZE) { 1367 pr_err("Malformed AGF PDU\n"); 1368 return; 1369 } 1370 1371 skb_pull(skb, LLCP_HEADER_SIZE); 1372 1373 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) { 1374 pdu_len = skb->data[0] << 8 | skb->data[1]; 1375 1376 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE); 1377 1378 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) { 1379 pr_err("Malformed AGF PDU\n"); 1380 return; 1381 } 1382 1383 ptype = nfc_llcp_ptype(skb); 1384 1385 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF) 1386 goto next; 1387 1388 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL); 1389 if (new_skb == NULL) { 1390 pr_err("Could not allocate PDU\n"); 1391 return; 1392 } 1393 1394 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len); 1395 1396 nfc_llcp_rx_skb(local, new_skb); 1397 1398 kfree_skb(new_skb); 1399next: 1400 skb_pull(skb, pdu_len); 1401 } 1402} 1403 1404static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb) 1405{ 1406 u8 dsap, ssap, ptype; 1407 1408 ptype = nfc_llcp_ptype(skb); 1409 dsap = nfc_llcp_dsap(skb); 1410 ssap = nfc_llcp_ssap(skb); 1411 1412 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); 1413 1414 if (ptype != LLCP_PDU_SYMM) 1415 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, 1416 16, 1, skb->data, skb->len, true); 1417 1418 switch (ptype) { 1419 case LLCP_PDU_SYMM: 1420 pr_debug("SYMM\n"); 1421 break; 1422 1423 case LLCP_PDU_UI: 1424 pr_debug("UI\n"); 1425 nfc_llcp_recv_ui(local, skb); 1426 break; 1427 1428 case LLCP_PDU_CONNECT: 1429 pr_debug("CONNECT\n"); 1430 nfc_llcp_recv_connect(local, skb); 1431 break; 1432 1433 case LLCP_PDU_DISC: 1434 pr_debug("DISC\n"); 1435 nfc_llcp_recv_disc(local, skb); 1436 break; 1437 1438 case LLCP_PDU_CC: 1439 pr_debug("CC\n"); 1440 nfc_llcp_recv_cc(local, skb); 1441 break; 1442 1443 case LLCP_PDU_DM: 1444 pr_debug("DM\n"); 1445 nfc_llcp_recv_dm(local, skb); 1446 break; 1447 1448 case LLCP_PDU_SNL: 1449 pr_debug("SNL\n"); 1450 nfc_llcp_recv_snl(local, skb); 1451 break; 1452 1453 case LLCP_PDU_I: 1454 case LLCP_PDU_RR: 1455 case LLCP_PDU_RNR: 1456 pr_debug("I frame\n"); 1457 nfc_llcp_recv_hdlc(local, skb); 1458 break; 1459 1460 case LLCP_PDU_AGF: 1461 pr_debug("AGF frame\n"); 1462 nfc_llcp_recv_agf(local, skb); 1463 break; 1464 } 1465} 1466 1467static void nfc_llcp_rx_work(struct work_struct *work) 1468{ 1469 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, 1470 rx_work); 1471 struct sk_buff *skb; 1472 1473 skb = local->rx_pending; 1474 if (skb == NULL) { 1475 pr_debug("No pending SKB\n"); 1476 return; 1477 } 1478 1479 __net_timestamp(skb); 1480 1481 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX); 1482 1483 nfc_llcp_rx_skb(local, skb); 1484 1485 schedule_work(&local->tx_work); 1486 kfree_skb(local->rx_pending); 1487 local->rx_pending = NULL; 1488} 1489 1490static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) 1491{ 1492 local->rx_pending = skb; 1493 del_timer(&local->link_timer); 1494 schedule_work(&local->rx_work); 1495} 1496 1497void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) 1498{ 1499 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; 1500 1501 pr_debug("Received an LLCP PDU\n"); 1502 if (err < 0) { 1503 pr_err("err %d\n", err); 1504 return; 1505 } 1506 1507 __nfc_llcp_recv(local, skb); 1508} 1509 1510int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) 1511{ 1512 struct nfc_llcp_local *local; 1513 1514 local = nfc_llcp_find_local(dev); 1515 if (local == NULL) { 1516 kfree_skb(skb); 1517 return -ENODEV; 1518 } 1519 1520 __nfc_llcp_recv(local, skb); 1521 1522 return 0; 1523} 1524 1525void nfc_llcp_mac_is_down(struct nfc_dev *dev) 1526{ 1527 struct nfc_llcp_local *local; 1528 1529 local = nfc_llcp_find_local(dev); 1530 if (local == NULL) 1531 return; 1532 1533 local->remote_miu = LLCP_DEFAULT_MIU; 1534 local->remote_lto = LLCP_DEFAULT_LTO; 1535 1536 /* Close and purge all existing sockets */ 1537 nfc_llcp_socket_release(local, true, 0); 1538} 1539 1540void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, 1541 u8 comm_mode, u8 rf_mode) 1542{ 1543 struct nfc_llcp_local *local; 1544 1545 pr_debug("rf mode %d\n", rf_mode); 1546 1547 local = nfc_llcp_find_local(dev); 1548 if (local == NULL) 1549 return; 1550 1551 local->target_idx = target_idx; 1552 local->comm_mode = comm_mode; 1553 local->rf_mode = rf_mode; 1554 1555 if (rf_mode == NFC_RF_INITIATOR) { 1556 pr_debug("Queueing Tx work\n"); 1557 1558 schedule_work(&local->tx_work); 1559 } else { 1560 mod_timer(&local->link_timer, 1561 jiffies + msecs_to_jiffies(local->remote_lto)); 1562 } 1563} 1564 1565int nfc_llcp_register_device(struct nfc_dev *ndev) 1566{ 1567 struct nfc_llcp_local *local; 1568 1569 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); 1570 if (local == NULL) 1571 return -ENOMEM; 1572 1573 local->dev = ndev; 1574 INIT_LIST_HEAD(&local->list); 1575 kref_init(&local->ref); 1576 mutex_init(&local->sdp_lock); 1577 init_timer(&local->link_timer); 1578 local->link_timer.data = (unsigned long) local; 1579 local->link_timer.function = nfc_llcp_symm_timer; 1580 1581 skb_queue_head_init(&local->tx_queue); 1582 INIT_WORK(&local->tx_work, nfc_llcp_tx_work); 1583 1584 local->rx_pending = NULL; 1585 INIT_WORK(&local->rx_work, nfc_llcp_rx_work); 1586 1587 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); 1588 1589 rwlock_init(&local->sockets.lock); 1590 rwlock_init(&local->connecting_sockets.lock); 1591 rwlock_init(&local->raw_sockets.lock); 1592 1593 local->lto = 150; /* 1500 ms */ 1594 local->rw = LLCP_MAX_RW; 1595 local->miux = cpu_to_be16(LLCP_MAX_MIUX); 1596 local->local_wks = 0x1; /* LLC Link Management */ 1597 1598 nfc_llcp_build_gb(local); 1599 1600 local->remote_miu = LLCP_DEFAULT_MIU; 1601 local->remote_lto = LLCP_DEFAULT_LTO; 1602 1603 mutex_init(&local->sdreq_lock); 1604 INIT_HLIST_HEAD(&local->pending_sdreqs); 1605 init_timer(&local->sdreq_timer); 1606 local->sdreq_timer.data = (unsigned long) local; 1607 local->sdreq_timer.function = nfc_llcp_sdreq_timer; 1608 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work); 1609 1610 list_add(&local->list, &llcp_devices); 1611 1612 return 0; 1613} 1614 1615void nfc_llcp_unregister_device(struct nfc_dev *dev) 1616{ 1617 struct nfc_llcp_local *local = nfc_llcp_find_local(dev); 1618 1619 if (local == NULL) { 1620 pr_debug("No such device\n"); 1621 return; 1622 } 1623 1624 local_cleanup(local); 1625 1626 nfc_llcp_local_put(local); 1627} 1628 1629int __init nfc_llcp_init(void) 1630{ 1631 return nfc_llcp_sock_init(); 1632} 1633 1634void nfc_llcp_exit(void) 1635{ 1636 nfc_llcp_sock_exit(); 1637} 1638