2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/nfc.h>
27 #include <net/nfc/nfc.h>
32 static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
46 static u8 llcp_tlv8(u8 *tlv, u8 type)
48 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
54 static u16 llcp_tlv16(u8 *tlv, u8 type)
56 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
59 return be16_to_cpu(*((__be16 *)(tlv + 2)));
63 static u8 llcp_tlv_version(u8 *tlv)
65 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
68 static u16 llcp_tlv_miux(u8 *tlv)
70 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
73 static u16 llcp_tlv_wks(u8 *tlv)
75 return llcp_tlv16(tlv, LLCP_TLV_WKS);
78 static u16 llcp_tlv_lto(u8 *tlv)
80 return llcp_tlv8(tlv, LLCP_TLV_LTO);
83 static u8 llcp_tlv_opt(u8 *tlv)
85 return llcp_tlv8(tlv, LLCP_TLV_OPT);
88 static u8 llcp_tlv_rw(u8 *tlv)
90 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
93 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
97 pr_debug("type %d\n", type);
99 if (type >= LLCP_TLV_MAX)
102 length = llcp_tlv_length[type];
103 if (length == 0 && value_length == 0)
105 else if (length == 0)
106 length = value_length;
108 *tlv_length = 2 + length;
109 tlv = kzalloc(2 + length, GFP_KERNEL);
115 memcpy(tlv + 2, value, length);
120 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
122 struct nfc_llcp_sdp_tlv *sdres;
125 sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
132 sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
134 if (sdres->tlv == NULL) {
142 INIT_HLIST_NODE(&sdres->node);
147 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
153 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
154 u8 *tlv_array, u16 tlv_array_len)
156 u8 *tlv = tlv_array, type, length, offset = 0;
158 pr_debug("TLV array length %d\n", tlv_array_len);
163 while (offset < tlv_array_len) {
167 pr_debug("type 0x%x length %d\n", type, length);
170 case LLCP_TLV_VERSION:
171 local->remote_version = llcp_tlv_version(tlv);
174 local->remote_miu = llcp_tlv_miux(tlv) + 128;
177 local->remote_wks = llcp_tlv_wks(tlv);
180 local->remote_lto = llcp_tlv_lto(tlv) * 10;
183 local->remote_opt = llcp_tlv_opt(tlv);
186 pr_err("Invalid gt tlv value 0x%x\n", type);
190 offset += length + 2;
194 pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
195 local->remote_version, local->remote_miu,
196 local->remote_lto, local->remote_opt,
202 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
203 u8 *tlv_array, u16 tlv_array_len)
205 u8 *tlv = tlv_array, type, length, offset = 0;
207 pr_debug("TLV array length %d\n", tlv_array_len);
212 while (offset < tlv_array_len) {
216 pr_debug("type 0x%x length %d\n", type, length);
220 sock->remote_miu = llcp_tlv_miux(tlv) + 128;
223 sock->remote_rw = llcp_tlv_rw(tlv);
228 pr_err("Invalid gt tlv value 0x%x\n", type);
232 offset += length + 2;
236 pr_debug("sock %p rw %d miu %d\n", sock,
237 sock->remote_rw, sock->remote_miu);
242 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
243 u8 dsap, u8 ssap, u8 ptype)
247 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
249 header[0] = (u8)((dsap << 2) | (ptype >> 2));
250 header[1] = (u8)((ptype << 6) | ssap);
252 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
254 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
259 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
262 /* XXX Add an skb length check */
267 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
272 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
281 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
282 size + LLCP_HEADER_SIZE, &err);
284 pr_err("Could not allocate PDU\n");
288 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
293 int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
297 struct nfc_llcp_local *local;
299 pr_debug("Sending DISC\n");
309 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
313 skb_queue_tail(&local->tx_queue, skb);
318 int nfc_llcp_send_symm(struct nfc_dev *dev)
321 struct nfc_llcp_local *local;
324 pr_debug("Sending SYMM\n");
326 local = nfc_llcp_find_local(dev);
330 size += LLCP_HEADER_SIZE;
331 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
333 skb = alloc_skb(size, GFP_KERNEL);
337 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
339 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
341 __net_timestamp(skb);
343 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX);
345 return nfc_data_exchange(dev, local->target_idx, skb,
346 nfc_llcp_recv, local);
349 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
351 struct nfc_llcp_local *local;
353 u8 *service_name_tlv = NULL, service_name_tlv_length;
354 u8 *miux_tlv = NULL, miux_tlv_length;
355 u8 *rw_tlv = NULL, rw_tlv_length, rw;
359 pr_debug("Sending CONNECT\n");
365 if (sock->service_name != NULL) {
366 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
368 sock->service_name_len,
369 &service_name_tlv_length);
370 size += service_name_tlv_length;
373 /* If the socket parameters are not set, use the local ones */
374 miux = sock->miux > LLCP_MAX_MIUX ? local->miux : sock->miux;
375 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
377 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
379 size += miux_tlv_length;
381 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
382 size += rw_tlv_length;
384 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
386 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
392 if (service_name_tlv != NULL)
393 skb = llcp_add_tlv(skb, service_name_tlv,
394 service_name_tlv_length);
396 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
397 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
399 skb_queue_tail(&local->tx_queue, skb);
404 pr_err("error %d\n", err);
406 kfree(service_name_tlv);
413 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
415 struct nfc_llcp_local *local;
417 u8 *miux_tlv = NULL, miux_tlv_length;
418 u8 *rw_tlv = NULL, rw_tlv_length, rw;
422 pr_debug("Sending CC\n");
428 /* If the socket parameters are not set, use the local ones */
429 miux = sock->miux > LLCP_MAX_MIUX ? local->miux : sock->miux;
430 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
432 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
434 size += miux_tlv_length;
436 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
437 size += rw_tlv_length;
439 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
445 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
446 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
448 skb_queue_tail(&local->tx_queue, skb);
453 pr_err("error %d\n", err);
461 static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
469 return ERR_PTR(-ENODEV);
473 return ERR_PTR(-ENODEV);
475 size += LLCP_HEADER_SIZE;
476 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
479 skb = alloc_skb(size, GFP_KERNEL);
481 return ERR_PTR(-ENOMEM);
483 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
485 skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
490 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
491 struct hlist_head *tlv_list, size_t tlvs_len)
493 struct nfc_llcp_sdp_tlv *sdp;
494 struct hlist_node *n;
497 skb = nfc_llcp_allocate_snl(local, tlvs_len);
501 hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
502 memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);
504 hlist_del(&sdp->node);
506 nfc_llcp_free_sdp_tlv(sdp);
509 skb_queue_tail(&local->tx_queue, skb);
514 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
518 u16 size = 1; /* Reason code */
520 pr_debug("Sending DM reason 0x%x\n", reason);
529 size += LLCP_HEADER_SIZE;
530 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
532 skb = alloc_skb(size, GFP_KERNEL);
536 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
538 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
540 memcpy(skb_put(skb, 1), &reason, 1);
542 skb_queue_head(&local->tx_queue, skb);
547 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
550 struct nfc_llcp_local *local;
552 pr_debug("Send DISC\n");
558 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
562 skb_queue_head(&local->tx_queue, skb);
567 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
568 struct msghdr *msg, size_t len)
571 struct sock *sk = &sock->sk;
572 struct nfc_llcp_local *local;
573 size_t frag_len = 0, remaining_len;
574 u8 *msg_data, *msg_ptr;
576 pr_debug("Send I frame len %zd\n", len);
582 /* Remote is ready but has not acknowledged our frames */
583 if((sock->remote_ready &&
584 skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
585 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
586 pr_err("Pending queue is full %d frames\n",
587 skb_queue_len(&sock->tx_pending_queue));
591 /* Remote is not ready and we've been queueing enough frames */
592 if ((!sock->remote_ready &&
593 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
594 pr_err("Tx queue is full %d frames\n",
595 skb_queue_len(&sock->tx_queue));
599 msg_data = kzalloc(len, GFP_KERNEL);
600 if (msg_data == NULL)
603 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
611 while (remaining_len > 0) {
613 frag_len = min_t(size_t, sock->remote_miu, remaining_len);
615 pr_debug("Fragment %zd bytes remaining %zd",
616 frag_len, remaining_len);
618 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
619 frag_len + LLCP_SEQUENCE_SIZE);
623 skb_put(pdu, LLCP_SEQUENCE_SIZE);
625 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
627 skb_queue_tail(&sock->tx_queue, pdu);
631 nfc_llcp_queue_i_frames(sock);
635 remaining_len -= frag_len;
644 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
645 struct msghdr *msg, size_t len)
648 struct nfc_llcp_local *local;
649 size_t frag_len = 0, remaining_len;
650 u8 *msg_ptr, *msg_data;
653 pr_debug("Send UI frame len %zd\n", len);
659 msg_data = kzalloc(len, GFP_KERNEL);
660 if (msg_data == NULL)
663 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
671 while (remaining_len > 0) {
673 frag_len = min_t(size_t, sock->remote_miu, remaining_len);
675 pr_debug("Fragment %zd bytes remaining %zd",
676 frag_len, remaining_len);
678 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
679 frag_len + LLCP_HEADER_SIZE, &err);
681 pr_err("Could not allocate PDU\n");
685 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
687 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
689 /* No need to check for the peer RW for UI frames */
690 skb_queue_tail(&local->tx_queue, pdu);
692 remaining_len -= frag_len;
701 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
704 struct nfc_llcp_local *local;
706 pr_debug("Send rr nr %d\n", sock->recv_n);
712 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
716 skb_put(skb, LLCP_SEQUENCE_SIZE);
718 skb->data[2] = sock->recv_n;
720 skb_queue_head(&local->tx_queue, skb);