1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2011 Intel Corporation. All rights reserved.
6 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/nfc.h>
13 #include <net/nfc/nfc.h>
18 static const u8 llcp_tlv_length[LLCP_TLV_MAX] = {
32 static u8 llcp_tlv8(const u8 *tlv, u8 type)
34 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
40 static u16 llcp_tlv16(const u8 *tlv, u8 type)
42 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
45 return be16_to_cpu(*((__be16 *)(tlv + 2)));
49 static u8 llcp_tlv_version(const u8 *tlv)
51 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
54 static u16 llcp_tlv_miux(const u8 *tlv)
56 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
59 static u16 llcp_tlv_wks(const u8 *tlv)
61 return llcp_tlv16(tlv, LLCP_TLV_WKS);
64 static u16 llcp_tlv_lto(const u8 *tlv)
66 return llcp_tlv8(tlv, LLCP_TLV_LTO);
69 static u8 llcp_tlv_opt(const u8 *tlv)
71 return llcp_tlv8(tlv, LLCP_TLV_OPT);
74 static u8 llcp_tlv_rw(const u8 *tlv)
76 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
79 u8 *nfc_llcp_build_tlv(u8 type, const u8 *value, u8 value_length, u8 *tlv_length)
83 pr_debug("type %d\n", type);
85 if (type >= LLCP_TLV_MAX)
88 length = llcp_tlv_length[type];
89 if (length == 0 && value_length == 0)
92 length = value_length;
94 *tlv_length = 2 + length;
95 tlv = kzalloc(2 + length, GFP_KERNEL);
101 memcpy(tlv + 2, value, length);
106 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
108 struct nfc_llcp_sdp_tlv *sdres;
111 sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
118 sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
120 if (sdres->tlv == NULL) {
128 INIT_HLIST_NODE(&sdres->node);
133 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, const char *uri,
136 struct nfc_llcp_sdp_tlv *sdreq;
138 pr_debug("uri: %s, len: %zu\n", uri, uri_len);
140 /* sdreq->tlv_len is u8, takes uri_len, + 3 for header, + 1 for NULL */
141 if (WARN_ON_ONCE(uri_len > U8_MAX - 4))
144 sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
148 sdreq->tlv_len = uri_len + 3;
150 if (uri[uri_len - 1] == 0)
153 sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
154 if (sdreq->tlv == NULL) {
159 sdreq->tlv[0] = LLCP_TLV_SDREQ;
160 sdreq->tlv[1] = sdreq->tlv_len - 2;
164 sdreq->uri = sdreq->tlv + 3;
165 memcpy(sdreq->uri, uri, uri_len);
167 sdreq->time = jiffies;
169 INIT_HLIST_NODE(&sdreq->node);
174 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
180 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
182 struct nfc_llcp_sdp_tlv *sdp;
183 struct hlist_node *n;
185 hlist_for_each_entry_safe(sdp, n, head, node) {
186 hlist_del(&sdp->node);
188 nfc_llcp_free_sdp_tlv(sdp);
192 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
193 const u8 *tlv_array, u16 tlv_array_len)
195 const u8 *tlv = tlv_array;
196 u8 type, length, offset = 0;
198 pr_debug("TLV array length %d\n", tlv_array_len);
203 while (offset < tlv_array_len) {
207 pr_debug("type 0x%x length %d\n", type, length);
210 case LLCP_TLV_VERSION:
211 local->remote_version = llcp_tlv_version(tlv);
214 local->remote_miu = llcp_tlv_miux(tlv) + 128;
217 local->remote_wks = llcp_tlv_wks(tlv);
220 local->remote_lto = llcp_tlv_lto(tlv) * 10;
223 local->remote_opt = llcp_tlv_opt(tlv);
226 pr_err("Invalid gt tlv value 0x%x\n", type);
230 offset += length + 2;
234 pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
235 local->remote_version, local->remote_miu,
236 local->remote_lto, local->remote_opt,
242 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
243 const u8 *tlv_array, u16 tlv_array_len)
245 const u8 *tlv = tlv_array;
246 u8 type, length, offset = 0;
248 pr_debug("TLV array length %d\n", tlv_array_len);
253 while (offset < tlv_array_len) {
257 pr_debug("type 0x%x length %d\n", type, length);
261 sock->remote_miu = llcp_tlv_miux(tlv) + 128;
264 sock->remote_rw = llcp_tlv_rw(tlv);
269 pr_err("Invalid gt tlv value 0x%x\n", type);
273 offset += length + 2;
277 pr_debug("sock %p rw %d miu %d\n", sock,
278 sock->remote_rw, sock->remote_miu);
283 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
284 u8 dsap, u8 ssap, u8 ptype)
288 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
290 header[0] = (u8)((dsap << 2) | (ptype >> 2));
291 header[1] = (u8)((ptype << 6) | ssap);
293 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
295 skb_put_data(pdu, header, LLCP_HEADER_SIZE);
300 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, const u8 *tlv,
303 /* XXX Add an skb length check */
308 skb_put_data(pdu, tlv, tlv_length);
313 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
322 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
323 size + LLCP_HEADER_SIZE, &err);
325 pr_err("Could not allocate PDU\n");
329 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
334 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
338 struct nfc_llcp_local *local;
348 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
352 skb_queue_tail(&local->tx_queue, skb);
357 int nfc_llcp_send_symm(struct nfc_dev *dev)
360 struct nfc_llcp_local *local;
363 local = nfc_llcp_find_local(dev);
367 size += LLCP_HEADER_SIZE;
368 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
370 skb = alloc_skb(size, GFP_KERNEL);
374 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
376 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
378 __net_timestamp(skb);
380 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
382 return nfc_data_exchange(dev, local->target_idx, skb,
383 nfc_llcp_recv, local);
386 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
388 struct nfc_llcp_local *local;
390 const u8 *service_name_tlv = NULL;
391 const u8 *miux_tlv = NULL;
392 const u8 *rw_tlv = NULL;
393 u8 service_name_tlv_length = 0;
394 u8 miux_tlv_length, rw_tlv_length, rw;
403 if (sock->service_name != NULL) {
404 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
406 sock->service_name_len,
407 &service_name_tlv_length);
408 if (!service_name_tlv) {
412 size += service_name_tlv_length;
415 /* If the socket parameters are not set, use the local ones */
416 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
417 local->miux : sock->miux;
418 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
420 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
426 size += miux_tlv_length;
428 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
433 size += rw_tlv_length;
435 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
437 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
443 llcp_add_tlv(skb, service_name_tlv, service_name_tlv_length);
444 llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
445 llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
447 skb_queue_tail(&local->tx_queue, skb);
453 pr_err("error %d\n", err);
455 kfree(service_name_tlv);
462 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
464 struct nfc_llcp_local *local;
466 const u8 *miux_tlv = NULL;
467 const u8 *rw_tlv = NULL;
468 u8 miux_tlv_length, rw_tlv_length, rw;
477 /* If the socket parameters are not set, use the local ones */
478 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
479 local->miux : sock->miux;
480 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
482 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
488 size += miux_tlv_length;
490 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
495 size += rw_tlv_length;
497 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
503 llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
504 llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
506 skb_queue_tail(&local->tx_queue, skb);
512 pr_err("error %d\n", err);
520 static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
528 return ERR_PTR(-ENODEV);
532 return ERR_PTR(-ENODEV);
534 size += LLCP_HEADER_SIZE;
535 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
538 skb = alloc_skb(size, GFP_KERNEL);
540 return ERR_PTR(-ENOMEM);
542 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
544 skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
549 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
550 struct hlist_head *tlv_list, size_t tlvs_len)
552 struct nfc_llcp_sdp_tlv *sdp;
553 struct hlist_node *n;
556 skb = nfc_llcp_allocate_snl(local, tlvs_len);
560 hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
561 skb_put_data(skb, sdp->tlv, sdp->tlv_len);
563 hlist_del(&sdp->node);
565 nfc_llcp_free_sdp_tlv(sdp);
568 skb_queue_tail(&local->tx_queue, skb);
573 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
574 struct hlist_head *tlv_list, size_t tlvs_len)
576 struct nfc_llcp_sdp_tlv *sdreq;
577 struct hlist_node *n;
580 skb = nfc_llcp_allocate_snl(local, tlvs_len);
584 mutex_lock(&local->sdreq_lock);
586 if (hlist_empty(&local->pending_sdreqs))
587 mod_timer(&local->sdreq_timer,
588 jiffies + msecs_to_jiffies(3 * local->remote_lto));
590 hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
591 pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);
593 skb_put_data(skb, sdreq->tlv, sdreq->tlv_len);
595 hlist_del(&sdreq->node);
597 hlist_add_head(&sdreq->node, &local->pending_sdreqs);
600 mutex_unlock(&local->sdreq_lock);
602 skb_queue_tail(&local->tx_queue, skb);
607 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
611 u16 size = 1; /* Reason code */
613 pr_debug("Sending DM reason 0x%x\n", reason);
622 size += LLCP_HEADER_SIZE;
623 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
625 skb = alloc_skb(size, GFP_KERNEL);
629 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
631 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
633 skb_put_data(skb, &reason, 1);
635 skb_queue_head(&local->tx_queue, skb);
640 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
641 struct msghdr *msg, size_t len)
644 struct sock *sk = &sock->sk;
645 struct nfc_llcp_local *local;
646 size_t frag_len = 0, remaining_len;
647 u8 *msg_data, *msg_ptr;
650 pr_debug("Send I frame len %zd\n", len);
656 /* Remote is ready but has not acknowledged our frames */
657 if((sock->remote_ready &&
658 skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
659 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
660 pr_err("Pending queue is full %d frames\n",
661 skb_queue_len(&sock->tx_pending_queue));
665 /* Remote is not ready and we've been queueing enough frames */
666 if ((!sock->remote_ready &&
667 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
668 pr_err("Tx queue is full %d frames\n",
669 skb_queue_len(&sock->tx_queue));
673 msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN);
674 if (msg_data == NULL)
677 if (memcpy_from_msg(msg_data, msg, len)) {
686 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
687 LLCP_DEFAULT_MIU : sock->remote_miu;
689 frag_len = min_t(size_t, remote_miu, remaining_len);
691 pr_debug("Fragment %zd bytes remaining %zd",
692 frag_len, remaining_len);
694 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
695 frag_len + LLCP_SEQUENCE_SIZE);
701 skb_put(pdu, LLCP_SEQUENCE_SIZE);
703 if (likely(frag_len > 0))
704 skb_put_data(pdu, msg_ptr, frag_len);
706 skb_queue_tail(&sock->tx_queue, pdu);
710 nfc_llcp_queue_i_frames(sock);
714 remaining_len -= frag_len;
716 } while (remaining_len > 0);
723 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
724 struct msghdr *msg, size_t len)
727 struct nfc_llcp_local *local;
728 size_t frag_len = 0, remaining_len;
729 u8 *msg_ptr, *msg_data;
733 pr_debug("Send UI frame len %zd\n", len);
739 msg_data = kmalloc(len, GFP_USER | __GFP_NOWARN);
740 if (msg_data == NULL)
743 if (memcpy_from_msg(msg_data, msg, len)) {
752 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
753 local->remote_miu : sock->remote_miu;
755 frag_len = min_t(size_t, remote_miu, remaining_len);
757 pr_debug("Fragment %zd bytes remaining %zd",
758 frag_len, remaining_len);
760 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, 0,
761 frag_len + LLCP_HEADER_SIZE, &err);
763 pr_err("Could not allocate PDU (error=%d)\n", err);
764 len -= remaining_len;
770 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
772 if (likely(frag_len > 0))
773 skb_put_data(pdu, msg_ptr, frag_len);
775 /* No need to check for the peer RW for UI frames */
776 skb_queue_tail(&local->tx_queue, pdu);
778 remaining_len -= frag_len;
780 } while (remaining_len > 0);
787 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
790 struct nfc_llcp_local *local;
792 pr_debug("Send rr nr %d\n", sock->recv_n);
798 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
802 skb_put(skb, LLCP_SEQUENCE_SIZE);
804 skb->data[2] = sock->recv_n;
806 skb_queue_head(&local->tx_queue, skb);