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, see <http://www.gnu.org/licenses/>.
18 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/nfc.h>
25 #include <net/nfc/nfc.h>
30 static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
44 static u8 llcp_tlv8(u8 *tlv, u8 type)
46 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
52 static u16 llcp_tlv16(u8 *tlv, u8 type)
54 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
57 return be16_to_cpu(*((__be16 *)(tlv + 2)));
61 static u8 llcp_tlv_version(u8 *tlv)
63 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
66 static u16 llcp_tlv_miux(u8 *tlv)
68 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
71 static u16 llcp_tlv_wks(u8 *tlv)
73 return llcp_tlv16(tlv, LLCP_TLV_WKS);
76 static u16 llcp_tlv_lto(u8 *tlv)
78 return llcp_tlv8(tlv, LLCP_TLV_LTO);
81 static u8 llcp_tlv_opt(u8 *tlv)
83 return llcp_tlv8(tlv, LLCP_TLV_OPT);
86 static u8 llcp_tlv_rw(u8 *tlv)
88 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
91 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
95 pr_debug("type %d\n", type);
97 if (type >= LLCP_TLV_MAX)
100 length = llcp_tlv_length[type];
101 if (length == 0 && value_length == 0)
103 else if (length == 0)
104 length = value_length;
106 *tlv_length = 2 + length;
107 tlv = kzalloc(2 + length, GFP_KERNEL);
113 memcpy(tlv + 2, value, length);
118 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
120 struct nfc_llcp_sdp_tlv *sdres;
123 sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
130 sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
132 if (sdres->tlv == NULL) {
140 INIT_HLIST_NODE(&sdres->node);
145 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
148 struct nfc_llcp_sdp_tlv *sdreq;
150 pr_debug("uri: %s, len: %zu\n", uri, uri_len);
152 sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
156 sdreq->tlv_len = uri_len + 3;
158 if (uri[uri_len - 1] == 0)
161 sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
162 if (sdreq->tlv == NULL) {
167 sdreq->tlv[0] = LLCP_TLV_SDREQ;
168 sdreq->tlv[1] = sdreq->tlv_len - 2;
172 sdreq->uri = sdreq->tlv + 3;
173 memcpy(sdreq->uri, uri, uri_len);
175 sdreq->time = jiffies;
177 INIT_HLIST_NODE(&sdreq->node);
182 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
188 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
190 struct nfc_llcp_sdp_tlv *sdp;
191 struct hlist_node *n;
193 hlist_for_each_entry_safe(sdp, n, head, node) {
194 hlist_del(&sdp->node);
196 nfc_llcp_free_sdp_tlv(sdp);
200 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
201 u8 *tlv_array, u16 tlv_array_len)
203 u8 *tlv = tlv_array, type, length, offset = 0;
205 pr_debug("TLV array length %d\n", tlv_array_len);
210 while (offset < tlv_array_len) {
214 pr_debug("type 0x%x length %d\n", type, length);
217 case LLCP_TLV_VERSION:
218 local->remote_version = llcp_tlv_version(tlv);
221 local->remote_miu = llcp_tlv_miux(tlv) + 128;
224 local->remote_wks = llcp_tlv_wks(tlv);
227 local->remote_lto = llcp_tlv_lto(tlv) * 10;
230 local->remote_opt = llcp_tlv_opt(tlv);
233 pr_err("Invalid gt tlv value 0x%x\n", type);
237 offset += length + 2;
241 pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
242 local->remote_version, local->remote_miu,
243 local->remote_lto, local->remote_opt,
249 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
250 u8 *tlv_array, u16 tlv_array_len)
252 u8 *tlv = tlv_array, type, length, offset = 0;
254 pr_debug("TLV array length %d\n", tlv_array_len);
259 while (offset < tlv_array_len) {
263 pr_debug("type 0x%x length %d\n", type, length);
267 sock->remote_miu = llcp_tlv_miux(tlv) + 128;
270 sock->remote_rw = llcp_tlv_rw(tlv);
275 pr_err("Invalid gt tlv value 0x%x\n", type);
279 offset += length + 2;
283 pr_debug("sock %p rw %d miu %d\n", sock,
284 sock->remote_rw, sock->remote_miu);
289 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
290 u8 dsap, u8 ssap, u8 ptype)
294 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
296 header[0] = (u8)((dsap << 2) | (ptype >> 2));
297 header[1] = (u8)((ptype << 6) | ssap);
299 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
301 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
306 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
309 /* XXX Add an skb length check */
314 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
319 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
328 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
329 size + LLCP_HEADER_SIZE, &err);
331 pr_err("Could not allocate PDU\n");
335 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
340 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
344 struct nfc_llcp_local *local;
346 pr_debug("Sending DISC\n");
356 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
360 skb_queue_tail(&local->tx_queue, skb);
365 int nfc_llcp_send_symm(struct nfc_dev *dev)
368 struct nfc_llcp_local *local;
371 pr_debug("Sending SYMM\n");
373 local = nfc_llcp_find_local(dev);
377 size += LLCP_HEADER_SIZE;
378 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
380 skb = alloc_skb(size, GFP_KERNEL);
384 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
386 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
388 __net_timestamp(skb);
390 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
392 return nfc_data_exchange(dev, local->target_idx, skb,
393 nfc_llcp_recv, local);
396 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
398 struct nfc_llcp_local *local;
400 u8 *service_name_tlv = NULL, service_name_tlv_length;
401 u8 *miux_tlv = NULL, miux_tlv_length;
402 u8 *rw_tlv = NULL, rw_tlv_length, rw;
406 pr_debug("Sending CONNECT\n");
412 if (sock->service_name != NULL) {
413 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
415 sock->service_name_len,
416 &service_name_tlv_length);
417 size += service_name_tlv_length;
420 /* If the socket parameters are not set, use the local ones */
421 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
422 local->miux : sock->miux;
423 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
425 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
427 size += miux_tlv_length;
429 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
430 size += rw_tlv_length;
432 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
434 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
440 if (service_name_tlv != NULL)
441 skb = llcp_add_tlv(skb, service_name_tlv,
442 service_name_tlv_length);
444 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
445 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
447 skb_queue_tail(&local->tx_queue, skb);
452 pr_err("error %d\n", err);
454 kfree(service_name_tlv);
461 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
463 struct nfc_llcp_local *local;
465 u8 *miux_tlv = NULL, miux_tlv_length;
466 u8 *rw_tlv = NULL, rw_tlv_length, rw;
470 pr_debug("Sending CC\n");
476 /* If the socket parameters are not set, use the local ones */
477 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
478 local->miux : sock->miux;
479 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
481 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
483 size += miux_tlv_length;
485 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
486 size += rw_tlv_length;
488 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
494 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
495 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
497 skb_queue_tail(&local->tx_queue, skb);
502 pr_err("error %d\n", err);
510 static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
518 return ERR_PTR(-ENODEV);
522 return ERR_PTR(-ENODEV);
524 size += LLCP_HEADER_SIZE;
525 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
528 skb = alloc_skb(size, GFP_KERNEL);
530 return ERR_PTR(-ENOMEM);
532 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
534 skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
539 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
540 struct hlist_head *tlv_list, size_t tlvs_len)
542 struct nfc_llcp_sdp_tlv *sdp;
543 struct hlist_node *n;
546 skb = nfc_llcp_allocate_snl(local, tlvs_len);
550 hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
551 memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);
553 hlist_del(&sdp->node);
555 nfc_llcp_free_sdp_tlv(sdp);
558 skb_queue_tail(&local->tx_queue, skb);
563 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
564 struct hlist_head *tlv_list, size_t tlvs_len)
566 struct nfc_llcp_sdp_tlv *sdreq;
567 struct hlist_node *n;
570 skb = nfc_llcp_allocate_snl(local, tlvs_len);
574 mutex_lock(&local->sdreq_lock);
576 if (hlist_empty(&local->pending_sdreqs))
577 mod_timer(&local->sdreq_timer,
578 jiffies + msecs_to_jiffies(3 * local->remote_lto));
580 hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
581 pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);
583 memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv,
586 hlist_del(&sdreq->node);
588 hlist_add_head(&sdreq->node, &local->pending_sdreqs);
591 mutex_unlock(&local->sdreq_lock);
593 skb_queue_tail(&local->tx_queue, skb);
598 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
602 u16 size = 1; /* Reason code */
604 pr_debug("Sending DM reason 0x%x\n", reason);
613 size += LLCP_HEADER_SIZE;
614 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
616 skb = alloc_skb(size, GFP_KERNEL);
620 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
622 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
624 memcpy(skb_put(skb, 1), &reason, 1);
626 skb_queue_head(&local->tx_queue, skb);
631 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
632 struct msghdr *msg, size_t len)
635 struct sock *sk = &sock->sk;
636 struct nfc_llcp_local *local;
637 size_t frag_len = 0, remaining_len;
638 u8 *msg_data, *msg_ptr;
641 pr_debug("Send I frame len %zd\n", len);
647 /* Remote is ready but has not acknowledged our frames */
648 if((sock->remote_ready &&
649 skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
650 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
651 pr_err("Pending queue is full %d frames\n",
652 skb_queue_len(&sock->tx_pending_queue));
656 /* Remote is not ready and we've been queueing enough frames */
657 if ((!sock->remote_ready &&
658 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
659 pr_err("Tx queue is full %d frames\n",
660 skb_queue_len(&sock->tx_queue));
664 msg_data = kzalloc(len, GFP_KERNEL);
665 if (msg_data == NULL)
668 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
677 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
678 LLCP_DEFAULT_MIU : sock->remote_miu;
680 frag_len = min_t(size_t, remote_miu, remaining_len);
682 pr_debug("Fragment %zd bytes remaining %zd",
683 frag_len, remaining_len);
685 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
686 frag_len + LLCP_SEQUENCE_SIZE);
692 skb_put(pdu, LLCP_SEQUENCE_SIZE);
694 if (likely(frag_len > 0))
695 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
697 skb_queue_tail(&sock->tx_queue, pdu);
701 nfc_llcp_queue_i_frames(sock);
705 remaining_len -= frag_len;
707 } while (remaining_len > 0);
714 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
715 struct msghdr *msg, size_t len)
718 struct nfc_llcp_local *local;
719 size_t frag_len = 0, remaining_len;
720 u8 *msg_ptr, *msg_data;
724 pr_debug("Send UI frame len %zd\n", len);
730 msg_data = kzalloc(len, GFP_KERNEL);
731 if (msg_data == NULL)
734 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
743 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
744 local->remote_miu : sock->remote_miu;
746 frag_len = min_t(size_t, remote_miu, remaining_len);
748 pr_debug("Fragment %zd bytes remaining %zd",
749 frag_len, remaining_len);
751 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
752 frag_len + LLCP_HEADER_SIZE, &err);
754 pr_err("Could not allocate PDU\n");
758 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
760 if (likely(frag_len > 0))
761 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
763 /* No need to check for the peer RW for UI frames */
764 skb_queue_tail(&local->tx_queue, pdu);
766 remaining_len -= frag_len;
768 } while (remaining_len > 0);
775 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
778 struct nfc_llcp_local *local;
780 pr_debug("Send rr nr %d\n", sock->recv_n);
786 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
790 skb_put(skb, LLCP_SEQUENCE_SIZE);
792 skb->data[2] = sock->recv_n;
794 skb_queue_head(&local->tx_queue, skb);