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authorSamuel Ortiz <sameo@linux.intel.com>2013-04-26 11:49:40 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2013-04-26 12:37:28 +0200
commit30cc4587659e1c9b1bfade8b2a757d91e04758ab (patch)
tree93a7ada48f9581851cdce979f09bcd0c3d4dd3d9 /net/nfc/llcp_core.c
parentb006ed545cbadf1ebd4683719554742d20dbcede (diff)
NFC: Move LLCP code to the NFC top level diirectory
And stop making it optional. LLCP is a fundamental part of the NFC specifications and making it optional does not make much sense. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc/llcp_core.c')
-rw-r--r--net/nfc/llcp_core.c1624
1 files changed, 1624 insertions, 0 deletions
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
new file mode 100644
index 000000000000..158bdbf668cc
--- /dev/null
+++ b/net/nfc/llcp_core.c
@@ -0,0 +1,1624 @@
+/*
+ * Copyright (C) 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/nfc.h>
+
+#include "nfc.h"
+#include "llcp.h"
+
+static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
+
+static struct list_head llcp_devices;
+
+static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
+
+void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
+{
+ write_lock(&l->lock);
+ sk_add_node(sk, &l->head);
+ write_unlock(&l->lock);
+}
+
+void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
+{
+ write_lock(&l->lock);
+ sk_del_node_init(sk);
+ write_unlock(&l->lock);
+}
+
+void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
+{
+ sock->remote_rw = LLCP_DEFAULT_RW;
+ sock->remote_miu = LLCP_MAX_MIU + 1;
+}
+
+static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
+{
+ struct nfc_llcp_local *local = sock->local;
+ struct sk_buff *s, *tmp;
+
+ pr_debug("%p\n", &sock->sk);
+
+ skb_queue_purge(&sock->tx_queue);
+ skb_queue_purge(&sock->tx_pending_queue);
+
+ if (local == NULL)
+ return;
+
+ /* Search for local pending SKBs that are related to this socket */
+ skb_queue_walk_safe(&local->tx_queue, s, tmp) {
+ if (s->sk != &sock->sk)
+ continue;
+
+ skb_unlink(s, &local->tx_queue);
+ kfree_skb(s);
+ }
+}
+
+static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
+ int err)
+{
+ struct sock *sk;
+ struct hlist_node *tmp;
+ struct nfc_llcp_sock *llcp_sock;
+
+ skb_queue_purge(&local->tx_queue);
+
+ write_lock(&local->sockets.lock);
+
+ sk_for_each_safe(sk, tmp, &local->sockets.head) {
+ llcp_sock = nfc_llcp_sock(sk);
+
+ bh_lock_sock(sk);
+
+ nfc_llcp_socket_purge(llcp_sock);
+
+ if (sk->sk_state == LLCP_CONNECTED)
+ nfc_put_device(llcp_sock->dev);
+
+ if (sk->sk_state == LLCP_LISTEN) {
+ struct nfc_llcp_sock *lsk, *n;
+ struct sock *accept_sk;
+
+ list_for_each_entry_safe(lsk, n,
+ &llcp_sock->accept_queue,
+ accept_queue) {
+ accept_sk = &lsk->sk;
+ bh_lock_sock(accept_sk);
+
+ nfc_llcp_accept_unlink(accept_sk);
+
+ if (err)
+ accept_sk->sk_err = err;
+ accept_sk->sk_state = LLCP_CLOSED;
+ accept_sk->sk_state_change(sk);
+
+ bh_unlock_sock(accept_sk);
+ }
+ }
+
+ if (err)
+ sk->sk_err = err;
+ sk->sk_state = LLCP_CLOSED;
+ sk->sk_state_change(sk);
+
+ bh_unlock_sock(sk);
+
+ sk_del_node_init(sk);
+ }
+
+ write_unlock(&local->sockets.lock);
+
+ /* If we still have a device, we keep the RAW sockets alive */
+ if (device == true)
+ return;
+
+ write_lock(&local->raw_sockets.lock);
+
+ sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
+ llcp_sock = nfc_llcp_sock(sk);
+
+ bh_lock_sock(sk);
+
+ nfc_llcp_socket_purge(llcp_sock);
+
+ if (err)
+ sk->sk_err = err;
+ sk->sk_state = LLCP_CLOSED;
+ sk->sk_state_change(sk);
+
+ bh_unlock_sock(sk);
+
+ sk_del_node_init(sk);
+ }
+
+ write_unlock(&local->raw_sockets.lock);
+}
+
+struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
+{
+ kref_get(&local->ref);
+
+ return local;
+}
+
+static void local_cleanup(struct nfc_llcp_local *local)
+{
+ nfc_llcp_socket_release(local, false, ENXIO);
+ del_timer_sync(&local->link_timer);
+ skb_queue_purge(&local->tx_queue);
+ cancel_work_sync(&local->tx_work);
+ cancel_work_sync(&local->rx_work);
+ cancel_work_sync(&local->timeout_work);
+ kfree_skb(local->rx_pending);
+ del_timer_sync(&local->sdreq_timer);
+ cancel_work_sync(&local->sdreq_timeout_work);
+ nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
+}
+
+static void local_release(struct kref *ref)
+{
+ struct nfc_llcp_local *local;
+
+ local = container_of(ref, struct nfc_llcp_local, ref);
+
+ list_del(&local->list);
+ local_cleanup(local);
+ kfree(local);
+}
+
+int nfc_llcp_local_put(struct nfc_llcp_local *local)
+{
+ if (local == NULL)
+ return 0;
+
+ return kref_put(&local->ref, local_release);
+}
+
+static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
+ u8 ssap, u8 dsap)
+{
+ struct sock *sk;
+ struct nfc_llcp_sock *llcp_sock, *tmp_sock;
+
+ pr_debug("ssap dsap %d %d\n", ssap, dsap);
+
+ if (ssap == 0 && dsap == 0)
+ return NULL;
+
+ read_lock(&local->sockets.lock);
+
+ llcp_sock = NULL;
+
+ sk_for_each(sk, &local->sockets.head) {
+ tmp_sock = nfc_llcp_sock(sk);
+
+ if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
+ llcp_sock = tmp_sock;
+ break;
+ }
+ }
+
+ read_unlock(&local->sockets.lock);
+
+ if (llcp_sock == NULL)
+ return NULL;
+
+ sock_hold(&llcp_sock->sk);
+
+ return llcp_sock;
+}
+
+static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
+{
+ sock_put(&sock->sk);
+}
+
+static void nfc_llcp_timeout_work(struct work_struct *work)
+{
+ struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
+ timeout_work);
+
+ nfc_dep_link_down(local->dev);
+}
+
+static void nfc_llcp_symm_timer(unsigned long data)
+{
+ struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
+
+ pr_err("SYMM timeout\n");
+
+ schedule_work(&local->timeout_work);
+}
+
+static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
+{
+ unsigned long time;
+ HLIST_HEAD(nl_sdres_list);
+ struct hlist_node *n;
+ struct nfc_llcp_sdp_tlv *sdp;
+ struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
+ sdreq_timeout_work);
+
+ mutex_lock(&local->sdreq_lock);
+
+ time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
+
+ hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
+ if (time_after(sdp->time, time))
+ continue;
+
+ sdp->sap = LLCP_SDP_UNBOUND;
+
+ hlist_del(&sdp->node);
+
+ hlist_add_head(&sdp->node, &nl_sdres_list);
+ }
+
+ if (!hlist_empty(&local->pending_sdreqs))
+ mod_timer(&local->sdreq_timer,
+ jiffies + msecs_to_jiffies(3 * local->remote_lto));
+
+ mutex_unlock(&local->sdreq_lock);
+
+ if (!hlist_empty(&nl_sdres_list))
+ nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
+}
+
+static void nfc_llcp_sdreq_timer(unsigned long data)
+{
+ struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
+
+ schedule_work(&local->sdreq_timeout_work);
+}
+
+struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
+{
+ struct nfc_llcp_local *local, *n;
+
+ list_for_each_entry_safe(local, n, &llcp_devices, list)
+ if (local->dev == dev)
+ return local;
+
+ pr_debug("No device found\n");
+
+ return NULL;
+}
+
+static char *wks[] = {
+ NULL,
+ NULL, /* SDP */
+ "urn:nfc:sn:ip",
+ "urn:nfc:sn:obex",
+ "urn:nfc:sn:snep",
+};
+
+static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
+{
+ int sap, num_wks;
+
+ pr_debug("%s\n", service_name);
+
+ if (service_name == NULL)
+ return -EINVAL;
+
+ num_wks = ARRAY_SIZE(wks);
+
+ for (sap = 0; sap < num_wks; sap++) {
+ if (wks[sap] == NULL)
+ continue;
+
+ if (strncmp(wks[sap], service_name, service_name_len) == 0)
+ return sap;
+ }
+
+ return -EINVAL;
+}
+
+static
+struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
+ u8 *sn, size_t sn_len)
+{
+ struct sock *sk;
+ struct nfc_llcp_sock *llcp_sock, *tmp_sock;
+
+ pr_debug("sn %zd %p\n", sn_len, sn);
+
+ if (sn == NULL || sn_len == 0)
+ return NULL;
+
+ read_lock(&local->sockets.lock);
+
+ llcp_sock = NULL;
+
+ sk_for_each(sk, &local->sockets.head) {
+ tmp_sock = nfc_llcp_sock(sk);
+
+ pr_debug("llcp sock %p\n", tmp_sock);
+
+ if (tmp_sock->sk.sk_type == SOCK_STREAM &&
+ tmp_sock->sk.sk_state != LLCP_LISTEN)
+ continue;
+
+ if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
+ tmp_sock->sk.sk_state != LLCP_BOUND)
+ continue;
+
+ if (tmp_sock->service_name == NULL ||
+ tmp_sock->service_name_len == 0)
+ continue;
+
+ if (tmp_sock->service_name_len != sn_len)
+ continue;
+
+ if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
+ llcp_sock = tmp_sock;
+ break;
+ }
+ }
+
+ read_unlock(&local->sockets.lock);
+
+ pr_debug("Found llcp sock %p\n", llcp_sock);
+
+ return llcp_sock;
+}
+
+u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
+ struct nfc_llcp_sock *sock)
+{
+ mutex_lock(&local->sdp_lock);
+
+ if (sock->service_name != NULL && sock->service_name_len > 0) {
+ int ssap = nfc_llcp_wks_sap(sock->service_name,
+ sock->service_name_len);
+
+ if (ssap > 0) {
+ pr_debug("WKS %d\n", ssap);
+
+ /* This is a WKS, let's check if it's free */
+ if (local->local_wks & BIT(ssap)) {
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_SAP_MAX;
+ }
+
+ set_bit(ssap, &local->local_wks);
+ mutex_unlock(&local->sdp_lock);
+
+ return ssap;
+ }
+
+ /*
+ * Check if there already is a non WKS socket bound
+ * to this service name.
+ */
+ if (nfc_llcp_sock_from_sn(local, sock->service_name,
+ sock->service_name_len) != NULL) {
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_SAP_MAX;
+ }
+
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_SDP_UNBOUND;
+
+ } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
+ if (!test_bit(sock->ssap, &local->local_wks)) {
+ set_bit(sock->ssap, &local->local_wks);
+ mutex_unlock(&local->sdp_lock);
+
+ return sock->ssap;
+ }
+ }
+
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_SAP_MAX;
+}
+
+u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
+{
+ u8 local_ssap;
+
+ mutex_lock(&local->sdp_lock);
+
+ local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
+ if (local_ssap == LLCP_LOCAL_NUM_SAP) {
+ mutex_unlock(&local->sdp_lock);
+ return LLCP_SAP_MAX;
+ }
+
+ set_bit(local_ssap, &local->local_sap);
+
+ mutex_unlock(&local->sdp_lock);
+
+ return local_ssap + LLCP_LOCAL_SAP_OFFSET;
+}
+
+void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
+{
+ u8 local_ssap;
+ unsigned long *sdp;
+
+ if (ssap < LLCP_WKS_NUM_SAP) {
+ local_ssap = ssap;
+ sdp = &local->local_wks;
+ } else if (ssap < LLCP_LOCAL_NUM_SAP) {
+ atomic_t *client_cnt;
+
+ local_ssap = ssap - LLCP_WKS_NUM_SAP;
+ sdp = &local->local_sdp;
+ client_cnt = &local->local_sdp_cnt[local_ssap];
+
+ pr_debug("%d clients\n", atomic_read(client_cnt));
+
+ mutex_lock(&local->sdp_lock);
+
+ if (atomic_dec_and_test(client_cnt)) {
+ struct nfc_llcp_sock *l_sock;
+
+ pr_debug("No more clients for SAP %d\n", ssap);
+
+ clear_bit(local_ssap, sdp);
+
+ /* Find the listening sock and set it back to UNBOUND */
+ l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
+ if (l_sock) {
+ l_sock->ssap = LLCP_SDP_UNBOUND;
+ nfc_llcp_sock_put(l_sock);
+ }
+ }
+
+ mutex_unlock(&local->sdp_lock);
+
+ return;
+ } else if (ssap < LLCP_MAX_SAP) {
+ local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
+ sdp = &local->local_sap;
+ } else {
+ return;
+ }
+
+ mutex_lock(&local->sdp_lock);
+
+ clear_bit(local_ssap, sdp);
+
+ mutex_unlock(&local->sdp_lock);
+}
+
+static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
+{
+ u8 ssap;
+
+ mutex_lock(&local->sdp_lock);
+
+ ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
+ if (ssap == LLCP_SDP_NUM_SAP) {
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_SAP_MAX;
+ }
+
+ pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
+
+ set_bit(ssap, &local->local_sdp);
+
+ mutex_unlock(&local->sdp_lock);
+
+ return LLCP_WKS_NUM_SAP + ssap;
+}
+
+static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
+{
+ u8 *gb_cur, *version_tlv, version, version_length;
+ u8 *lto_tlv, lto_length;
+ u8 *wks_tlv, wks_length;
+ u8 *miux_tlv, miux_length;
+ u8 gb_len = 0;
+ int ret = 0;
+
+ version = LLCP_VERSION_11;
+ version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
+ 1, &version_length);
+ gb_len += version_length;
+
+ lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
+ gb_len += lto_length;
+
+ pr_debug("Local wks 0x%lx\n", local->local_wks);
+ wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
+ &wks_length);
+ gb_len += wks_length;
+
+ miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
+ &miux_length);
+ gb_len += miux_length;
+
+ gb_len += ARRAY_SIZE(llcp_magic);
+
+ if (gb_len > NFC_MAX_GT_LEN) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ gb_cur = local->gb;
+
+ memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
+ gb_cur += ARRAY_SIZE(llcp_magic);
+
+ memcpy(gb_cur, version_tlv, version_length);
+ gb_cur += version_length;
+
+ memcpy(gb_cur, lto_tlv, lto_length);
+ gb_cur += lto_length;
+
+ memcpy(gb_cur, wks_tlv, wks_length);
+ gb_cur += wks_length;
+
+ memcpy(gb_cur, miux_tlv, miux_length);
+ gb_cur += miux_length;
+
+ local->gb_len = gb_len;
+
+out:
+ kfree(version_tlv);
+ kfree(lto_tlv);
+ kfree(wks_tlv);
+ kfree(miux_tlv);
+
+ return ret;
+}
+
+u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
+{
+ struct nfc_llcp_local *local;
+
+ local = nfc_llcp_find_local(dev);
+ if (local == NULL) {
+ *general_bytes_len = 0;
+ return NULL;
+ }
+
+ nfc_llcp_build_gb(local);
+
+ *general_bytes_len = local->gb_len;
+
+ return local->gb;
+}
+
+int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
+{
+ struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
+
+ if (local == NULL) {
+ pr_err("No LLCP device\n");
+ return -ENODEV;
+ }
+ if (gb_len < 3)
+ return -EINVAL;
+
+ memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
+ memcpy(local->remote_gb, gb, gb_len);
+ local->remote_gb_len = gb_len;
+
+ if (memcmp(local->remote_gb, llcp_magic, 3)) {
+ pr_err("MAC does not support LLCP\n");
+ return -EINVAL;
+ }
+
+ return nfc_llcp_parse_gb_tlv(local,
+ &local->remote_gb[3],
+ local->remote_gb_len - 3);
+}
+
+static u8 nfc_llcp_dsap(struct sk_buff *pdu)
+{
+ return (pdu->data[0] & 0xfc) >> 2;
+}
+
+static u8 nfc_llcp_ptype(struct sk_buff *pdu)
+{
+ return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
+}
+
+static u8 nfc_llcp_ssap(struct sk_buff *pdu)
+{
+ return pdu->data[1] & 0x3f;
+}
+
+static u8 nfc_llcp_ns(struct sk_buff *pdu)
+{
+ return pdu->data[2] >> 4;
+}
+
+static u8 nfc_llcp_nr(struct sk_buff *pdu)
+{
+ return pdu->data[2] & 0xf;
+}
+
+static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
+{
+ pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
+ sock->send_n = (sock->send_n + 1) % 16;
+ sock->recv_ack_n = (sock->recv_n - 1) % 16;
+}
+
+void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
+ struct sk_buff *skb, u8 direction)
+{
+ struct sk_buff *skb_copy = NULL, *nskb;
+ struct sock *sk;
+ u8 *data;
+
+ read_lock(&local->raw_sockets.lock);
+
+ sk_for_each(sk, &local->raw_sockets.head) {
+ if (sk->sk_state != LLCP_BOUND)
+ continue;
+
+ if (skb_copy == NULL) {
+ skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
+ GFP_ATOMIC);
+
+ if (skb_copy == NULL)
+ continue;
+
+ data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
+
+ data[0] = local->dev ? local->dev->idx : 0xFF;
+ data[1] = direction;
+ }
+
+ nskb = skb_clone(skb_copy, GFP_ATOMIC);
+ if (!nskb)
+ continue;
+
+ if (sock_queue_rcv_skb(sk, nskb))
+ kfree_skb(nskb);
+ }
+
+ read_unlock(&local->raw_sockets.lock);
+
+ kfree_skb(skb_copy);
+}
+
+static void nfc_llcp_tx_work(struct work_struct *work)
+{
+ struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
+ tx_work);
+ struct sk_buff *skb;
+ struct sock *sk;
+ struct nfc_llcp_sock *llcp_sock;
+
+ skb = skb_dequeue(&local->tx_queue);
+ if (skb != NULL) {
+ sk = skb->sk;
+ llcp_sock = nfc_llcp_sock(sk);
+
+ if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
+ nfc_llcp_send_symm(local->dev);
+ } else {
+ struct sk_buff *copy_skb = NULL;
+ u8 ptype = nfc_llcp_ptype(skb);
+ int ret;
+
+ pr_debug("Sending pending skb\n");
+ print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
+ DUMP_PREFIX_OFFSET, 16, 1,
+ skb->data, skb->len, true);
+
+ if (ptype == LLCP_PDU_I)
+ copy_skb = skb_copy(skb, GFP_ATOMIC);
+
+ __net_timestamp(skb);
+
+ nfc_llcp_send_to_raw_sock(local, skb,
+ NFC_LLCP_DIRECTION_TX);
+
+ ret = nfc_data_exchange(local->dev, local->target_idx,
+ skb, nfc_llcp_recv, local);
+
+ if (ret) {
+ kfree_skb(copy_skb);
+ goto out;
+ }
+
+ if (ptype == LLCP_PDU_I && copy_skb)
+ skb_queue_tail(&llcp_sock->tx_pending_queue,
+ copy_skb);
+ }
+ } else {
+ nfc_llcp_send_symm(local->dev);
+ }
+
+out:
+ mod_timer(&local->link_timer,
+ jiffies + msecs_to_jiffies(2 * local->remote_lto));
+}
+
+static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
+ u8 ssap)
+{
+ struct sock *sk;
+ struct nfc_llcp_sock *llcp_sock;
+
+ read_lock(&local->connecting_sockets.lock);
+
+ sk_for_each(sk, &local->connecting_sockets.head) {
+ llcp_sock = nfc_llcp_sock(sk);
+
+ if (llcp_sock->ssap == ssap) {
+ sock_hold(&llcp_sock->sk);
+ goto out;
+ }
+ }
+
+ llcp_sock = NULL;
+
+out:
+ read_unlock(&local->connecting_sockets.lock);
+
+ return llcp_sock;
+}
+
+static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
+ u8 *sn, size_t sn_len)
+{
+ struct nfc_llcp_sock *llcp_sock;
+
+ llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
+
+ if (llcp_sock == NULL)
+ return NULL;
+
+ sock_hold(&llcp_sock->sk);
+
+ return llcp_sock;
+}
+
+static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
+{
+ u8 *tlv = &skb->data[2], type, length;
+ size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
+
+ while (offset < tlv_array_len) {
+ type = tlv[0];
+ length = tlv[1];
+
+ pr_debug("type 0x%x length %d\n", type, length);
+
+ if (type == LLCP_TLV_SN) {
+ *sn_len = length;
+ return &tlv[2];
+ }
+
+ offset += length + 2;
+ tlv += length + 2;
+ }
+
+ return NULL;
+}
+
+static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
+ struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ struct nfc_llcp_ui_cb *ui_cb;
+ u8 dsap, ssap;
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ ui_cb = nfc_llcp_ui_skb_cb(skb);
+ ui_cb->dsap = dsap;
+ ui_cb->ssap = ssap;
+
+ pr_debug("%d %d\n", dsap, ssap);
+
+ /* We're looking for a bound socket, not a client one */
+ llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
+ if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
+ return;
+
+ /* There is no sequence with UI frames */
+ skb_pull(skb, LLCP_HEADER_SIZE);
+ if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
+ /*
+ * UI frames will be freed from the socket layer, so we
+ * need to keep them alive until someone receives them.
+ */
+ skb_get(skb);
+ } else {
+ pr_err("Receive queue is full\n");
+ }
+
+ nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
+ struct sk_buff *skb)
+{
+ struct sock *new_sk, *parent;
+ struct nfc_llcp_sock *sock, *new_sock;
+ u8 dsap, ssap, reason;
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ pr_debug("%d %d\n", dsap, ssap);
+
+ if (dsap != LLCP_SAP_SDP) {
+ sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
+ if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
+ reason = LLCP_DM_NOBOUND;
+ goto fail;
+ }
+ } else {
+ u8 *sn;
+ size_t sn_len;
+
+ sn = nfc_llcp_connect_sn(skb, &sn_len);
+ if (sn == NULL) {
+ reason = LLCP_DM_NOBOUND;
+ goto fail;
+ }
+
+ pr_debug("Service name length %zu\n", sn_len);
+
+ sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
+ if (sock == NULL) {
+ reason = LLCP_DM_NOBOUND;
+ goto fail;
+ }
+ }
+
+ lock_sock(&sock->sk);
+
+ parent = &sock->sk;
+
+ if (sk_acceptq_is_full(parent)) {
+ reason = LLCP_DM_REJ;
+ release_sock(&sock->sk);
+ sock_put(&sock->sk);
+ goto fail;
+ }
+
+ if (sock->ssap == LLCP_SDP_UNBOUND) {
+ u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
+
+ pr_debug("First client, reserving %d\n", ssap);
+
+ if (ssap == LLCP_SAP_MAX) {
+ reason = LLCP_DM_REJ;
+ release_sock(&sock->sk);
+ sock_put(&sock->sk);
+ goto fail;
+ }
+
+ sock->ssap = ssap;
+ }
+
+ new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
+ if (new_sk == NULL) {
+ reason = LLCP_DM_REJ;
+ release_sock(&sock->sk);
+ sock_put(&sock->sk);
+ goto fail;
+ }
+
+ new_sock = nfc_llcp_sock(new_sk);
+ new_sock->dev = local->dev;
+ new_sock->local = nfc_llcp_local_get(local);
+ new_sock->rw = sock->rw;
+ new_sock->miux = sock->miux;
+ new_sock->remote_miu = local->remote_miu;
+ new_sock->nfc_protocol = sock->nfc_protocol;
+ new_sock->dsap = ssap;
+ new_sock->target_idx = local->target_idx;
+ new_sock->parent = parent;
+ new_sock->ssap = sock->ssap;
+ if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
+ atomic_t *client_count;
+
+ pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
+
+ client_count =
+ &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
+
+ atomic_inc(client_count);
+ new_sock->reserved_ssap = sock->ssap;
+ }
+
+ nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
+ skb->len - LLCP_HEADER_SIZE);
+
+ pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
+
+ nfc_llcp_sock_link(&local->sockets, new_sk);
+
+ nfc_llcp_accept_enqueue(&sock->sk, new_sk);
+
+ nfc_get_device(local->dev->idx);
+
+ new_sk->sk_state = LLCP_CONNECTED;
+
+ /* Wake the listening processes */
+ parent->sk_data_ready(parent, 0);
+
+ /* Send CC */
+ nfc_llcp_send_cc(new_sock);
+
+ release_sock(&sock->sk);
+ sock_put(&sock->sk);
+
+ return;
+
+fail:
+ /* Send DM */
+ nfc_llcp_send_dm(local, dsap, ssap, reason);
+}
+
+int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
+{
+ int nr_frames = 0;
+ struct nfc_llcp_local *local = sock->local;
+
+ pr_debug("Remote ready %d tx queue len %d remote rw %d",
+ sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
+ sock->remote_rw);
+
+ /* Try to queue some I frames for transmission */
+ while (sock->remote_ready &&
+ skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
+ struct sk_buff *pdu;
+
+ pdu = skb_dequeue(&sock->tx_queue);
+ if (pdu == NULL)
+ break;
+
+ /* Update N(S)/N(R) */
+ nfc_llcp_set_nrns(sock, pdu);
+
+ skb_queue_tail(&local->tx_queue, pdu);
+ nr_frames++;
+ }
+
+ return nr_frames;
+}
+
+static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
+ struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ struct sock *sk;
+ u8 dsap, ssap, ptype, ns, nr;
+
+ ptype = nfc_llcp_ptype(skb);
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+ ns = nfc_llcp_ns(skb);
+ nr = nfc_llcp_nr(skb);
+
+ pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
+
+ llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
+ if (llcp_sock == NULL) {
+ nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
+ return;
+ }
+
+ sk = &llcp_sock->sk;
+ lock_sock(sk);
+ if (sk->sk_state == LLCP_CLOSED) {
+ release_sock(sk);
+ nfc_llcp_sock_put(llcp_sock);
+ }
+
+ /* Pass the payload upstream */
+ if (ptype == LLCP_PDU_I) {
+ pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
+
+ if (ns == llcp_sock->recv_n)
+ llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
+ else
+ pr_err("Received out of sequence I PDU\n");
+
+ skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
+ if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
+ /*
+ * I frames will be freed from the socket layer, so we
+ * need to keep them alive until someone receives them.
+ */
+ skb_get(skb);
+ } else {
+ pr_err("Receive queue is full\n");
+ }
+ }
+
+ /* Remove skbs from the pending queue */
+ if (llcp_sock->send_ack_n != nr) {
+ struct sk_buff *s, *tmp;
+ u8 n;
+
+ llcp_sock->send_ack_n = nr;
+
+ /* Remove and free all skbs until ns == nr */
+ skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
+ n = nfc_llcp_ns(s);
+
+ skb_unlink(s, &llcp_sock->tx_pending_queue);
+ kfree_skb(s);
+
+ if (n == nr)
+ break;
+ }
+
+ /* Re-queue the remaining skbs for transmission */
+ skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
+ s, tmp) {
+ skb_unlink(s, &llcp_sock->tx_pending_queue);
+ skb_queue_head(&local->tx_queue, s);
+ }
+ }
+
+ if (ptype == LLCP_PDU_RR)
+ llcp_sock->remote_ready = true;
+ else if (ptype == LLCP_PDU_RNR)
+ llcp_sock->remote_ready = false;
+
+ if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
+ nfc_llcp_send_rr(llcp_sock);
+
+ release_sock(sk);
+ nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
+ struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ struct sock *sk;
+ u8 dsap, ssap;
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ if ((dsap == 0) && (ssap == 0)) {
+ pr_debug("Connection termination");
+ nfc_dep_link_down(local->dev);
+ return;
+ }
+
+ llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
+ if (llcp_sock == NULL) {
+ nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
+ return;
+ }
+
+ sk = &llcp_sock->sk;
+ lock_sock(sk);
+
+ nfc_llcp_socket_purge(llcp_sock);
+
+ if (sk->sk_state == LLCP_CLOSED) {
+ release_sock(sk);
+ nfc_llcp_sock_put(llcp_sock);
+ }
+
+ if (sk->sk_state == LLCP_CONNECTED) {
+ nfc_put_device(local->dev);
+ sk->sk_state = LLCP_CLOSED;
+ sk->sk_state_change(sk);
+ }
+
+ nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
+
+ release_sock(sk);
+ nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ struct sock *sk;
+ u8 dsap, ssap;
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
+ if (llcp_sock == NULL) {
+ pr_err("Invalid CC\n");
+ nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
+
+ return;
+ }
+
+ sk = &llcp_sock->sk;
+
+ /* Unlink from connecting and link to the client array */
+ nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
+ nfc_llcp_sock_link(&local->sockets, sk);
+ llcp_sock->dsap = ssap;
+
+ nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
+ skb->len - LLCP_HEADER_SIZE);
+
+ sk->sk_state = LLCP_CONNECTED;
+ sk->sk_state_change(sk);
+
+ nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ struct sock *sk;
+ u8 dsap, ssap, reason;
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+ reason = skb->data[2];
+
+ pr_debug("%d %d reason %d\n", ssap, dsap, reason);
+
+ switch (reason) {
+ case LLCP_DM_NOBOUND:
+ case LLCP_DM_REJ:
+ llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
+ break;
+
+ default:
+ llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
+ break;
+ }
+
+ if (llcp_sock == NULL) {
+ pr_debug("Already closed\n");
+ return;
+ }
+
+ sk = &llcp_sock->sk;
+
+ sk->sk_err = ENXIO;
+ sk->sk_state = LLCP_CLOSED;
+ sk->sk_state_change(sk);
+
+ nfc_llcp_sock_put(llcp_sock);
+}
+
+static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
+ struct sk_buff *skb)
+{
+ struct nfc_llcp_sock *llcp_sock;
+ u8 dsap, ssap, *tlv, type, length, tid, sap;
+ u16 tlv_len, offset;
+ char *service_name;
+ size_t service_name_len;
+ struct nfc_llcp_sdp_tlv *sdp;
+ HLIST_HEAD(llc_sdres_list);
+ size_t sdres_tlvs_len;
+ HLIST_HEAD(nl_sdres_list);
+
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ pr_debug("%d %d\n", dsap, ssap);
+
+ if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
+ pr_err("Wrong SNL SAP\n");
+ return;
+ }
+
+ tlv = &skb->data[LLCP_HEADER_SIZE];
+ tlv_len = skb->len - LLCP_HEADER_SIZE;
+ offset = 0;
+ sdres_tlvs_len = 0;
+
+ while (offset < tlv_len) {
+ type = tlv[0];
+ length = tlv[1];
+
+ switch (type) {
+ case LLCP_TLV_SDREQ:
+ tid = tlv[2];
+ service_name = (char *) &tlv[3];
+ service_name_len = length - 1;
+
+ pr_debug("Looking for %.16s\n", service_name);
+
+ if (service_name_len == strlen("urn:nfc:sn:sdp") &&
+ !strncmp(service_name, "urn:nfc:sn:sdp",
+ service_name_len)) {
+ sap = 1;
+ goto add_snl;
+ }
+
+ llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
+ service_name_len);
+ if (!llcp_sock) {
+ sap = 0;
+ goto add_snl;
+ }
+
+ /*
+ * We found a socket but its ssap has not been reserved
+ * yet. We need to assign it for good and send a reply.
+ * The ssap will be freed when the socket is closed.
+ */
+ if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
+ atomic_t *client_count;
+
+ sap = nfc_llcp_reserve_sdp_ssap(local);
+
+ pr_debug("Reserving %d\n", sap);
+
+ if (sap == LLCP_SAP_MAX) {
+ sap = 0;
+ goto add_snl;
+ }
+
+ client_count =
+ &local->local_sdp_cnt[sap -
+ LLCP_WKS_NUM_SAP];
+
+ atomic_inc(client_count);
+
+ llcp_sock->ssap = sap;
+ llcp_sock->reserved_ssap = sap;
+ } else {
+ sap = llcp_sock->ssap;
+ }
+
+ pr_debug("%p %d\n", llcp_sock, sap);
+
+add_snl:
+ sdp = nfc_llcp_build_sdres_tlv(tid, sap);
+ if (sdp == NULL)
+ goto exit;
+
+ sdres_tlvs_len += sdp->tlv_len;
+ hlist_add_head(&sdp->node, &llc_sdres_list);
+ break;
+
+ case LLCP_TLV_SDRES:
+ mutex_lock(&local->sdreq_lock);
+
+ pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
+
+ hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
+ if (sdp->tid != tlv[2])
+ continue;
+
+ sdp->sap = tlv[3];
+
+ pr_debug("Found: uri=%s, sap=%d\n",
+ sdp->uri, sdp->sap);
+
+ hlist_del(&sdp->node);
+
+ hlist_add_head(&sdp->node, &nl_sdres_list);
+
+ break;
+ }
+
+ mutex_unlock(&local->sdreq_lock);
+ break;
+
+ default:
+ pr_err("Invalid SNL tlv value 0x%x\n", type);
+ break;
+ }
+
+ offset += length + 2;
+ tlv += length + 2;
+ }
+
+exit:
+ if (!hlist_empty(&nl_sdres_list))
+ nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
+
+ if (!hlist_empty(&llc_sdres_list))
+ nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
+}
+
+static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
+{
+ u8 ptype;
+ u16 pdu_len;
+ struct sk_buff *new_skb;
+
+ if (skb->len <= LLCP_HEADER_SIZE) {
+ pr_err("Malformed AGF PDU\n");
+ return;
+ }
+
+ skb_pull(skb, LLCP_HEADER_SIZE);
+
+ while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
+ pdu_len = skb->data[0] << 8 | skb->data[1];
+
+ skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
+
+ if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
+ pr_err("Malformed AGF PDU\n");
+ return;
+ }
+
+ ptype = nfc_llcp_ptype(skb);
+
+ if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
+ goto next;
+
+ new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
+ if (new_skb == NULL) {
+ pr_err("Could not allocate PDU\n");
+ return;
+ }
+
+ memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
+
+ nfc_llcp_rx_skb(local, new_skb);
+
+ kfree_skb(new_skb);
+next:
+ skb_pull(skb, pdu_len);
+ }
+}
+
+static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
+{
+ u8 dsap, ssap, ptype;
+
+ ptype = nfc_llcp_ptype(skb);
+ dsap = nfc_llcp_dsap(skb);
+ ssap = nfc_llcp_ssap(skb);
+
+ pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
+
+ if (ptype != LLCP_PDU_SYMM)
+ print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
+ 16, 1, skb->data, skb->len, true);
+
+ switch (ptype) {
+ case LLCP_PDU_SYMM:
+ pr_debug("SYMM\n");
+ break;
+
+ case LLCP_PDU_UI:
+ pr_debug("UI\n");
+ nfc_llcp_recv_ui(local, skb);
+ break;
+
+ case LLCP_PDU_CONNECT:
+ pr_debug("CONNECT\n");
+ nfc_llcp_recv_connect(local, skb);
+ break;
+
+ case LLCP_PDU_DISC:
+ pr_debug("DISC\n");
+ nfc_llcp_recv_disc(local, skb);
+ break;
+
+ case LLCP_PDU_CC:
+ pr_debug("CC\n");
+ nfc_llcp_recv_cc(local, skb);
+ break;
+
+ case LLCP_PDU_DM:
+ pr_debug("DM\n");
+ nfc_llcp_recv_dm(local, skb);
+ break;
+
+ case LLCP_PDU_SNL:
+ pr_debug("SNL\n");
+ nfc_llcp_recv_snl(local, skb);
+ break;
+
+ case LLCP_PDU_I:
+ case LLCP_PDU_RR:
+ case LLCP_PDU_RNR:
+ pr_debug("I frame\n");
+ nfc_llcp_recv_hdlc(local, skb);
+ break;
+
+ case LLCP_PDU_AGF:
+ pr_debug("AGF frame\n");
+ nfc_llcp_recv_agf(local, skb);
+ break;
+ }
+}
+
+static void nfc_llcp_rx_work(struct work_struct *work)
+{
+ struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
+ rx_work);
+ struct sk_buff *skb;
+
+ skb = local->rx_pending;
+ if (skb == NULL) {
+ pr_debug("No pending SKB\n");
+ return;
+ }
+
+ __net_timestamp(skb);
+
+ nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
+
+ nfc_llcp_rx_skb(local, skb);
+
+ schedule_work(&local->tx_work);
+ kfree_skb(local->rx_pending);
+ local->rx_pending = NULL;
+}
+
+static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
+{
+ local->rx_pending = skb;
+ del_timer(&local->link_timer);
+ schedule_work(&local->rx_work);
+}
+
+void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
+{
+ struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
+
+ pr_debug("Received an LLCP PDU\n");
+ if (err < 0) {
+ pr_err("err %d\n", err);
+ return;
+ }
+
+ __nfc_llcp_recv(local, skb);
+}
+
+int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
+{
+ struct nfc_llcp_local *local;
+
+ local = nfc_llcp_find_local(dev);
+ if (local == NULL)
+ return -ENODEV;
+
+ __nfc_llcp_recv(local, skb);
+
+ return 0;
+}
+
+void nfc_llcp_mac_is_down(struct nfc_dev *dev)
+{
+ struct nfc_llcp_local *local;
+
+ local = nfc_llcp_find_local(dev);
+ if (local == NULL)
+ return;
+
+ local->remote_miu = LLCP_DEFAULT_MIU;
+ local->remote_lto = LLCP_DEFAULT_LTO;
+
+ /* Close and purge all existing sockets */
+ nfc_llcp_socket_release(local, true, 0);
+}
+
+void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
+ u8 comm_mode, u8 rf_mode)
+{
+ struct nfc_llcp_local *local;
+
+ pr_debug("rf mode %d\n", rf_mode);
+
+ local = nfc_llcp_find_local(dev);
+ if (local == NULL)
+ return;
+
+ local->target_idx = target_idx;
+ local->comm_mode = comm_mode;
+ local->rf_mode = rf_mode;
+
+ if (rf_mode == NFC_RF_INITIATOR) {
+ pr_debug("Queueing Tx work\n");
+
+ schedule_work(&local->tx_work);
+ } else {
+ mod_timer(&local->link_timer,
+ jiffies + msecs_to_jiffies(local->remote_lto));
+ }
+}
+
+int nfc_llcp_register_device(struct nfc_dev *ndev)
+{
+ struct nfc_llcp_local *local;
+
+ local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
+ if (local == NULL)
+ return -ENOMEM;
+
+ local->dev = ndev;
+ INIT_LIST_HEAD(&local->list);
+ kref_init(&local->ref);
+ mutex_init(&local->sdp_lock);
+ init_timer(&local->link_timer);
+ local->link_timer.data = (unsigned long) local;
+ local->link_timer.function = nfc_llcp_symm_timer;
+
+ skb_queue_head_init(&local->tx_queue);
+ INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
+
+ local->rx_pending = NULL;
+ INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
+
+ INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
+
+ rwlock_init(&local->sockets.lock);
+ rwlock_init(&local->connecting_sockets.lock);
+ rwlock_init(&local->raw_sockets.lock);
+
+ local->lto = 150; /* 1500 ms */
+ local->rw = LLCP_MAX_RW;
+ local->miux = cpu_to_be16(LLCP_MAX_MIUX);
+
+ nfc_llcp_build_gb(local);
+
+ local->remote_miu = LLCP_DEFAULT_MIU;
+ local->remote_lto = LLCP_DEFAULT_LTO;
+
+ mutex_init(&local->sdreq_lock);
+ INIT_HLIST_HEAD(&local->pending_sdreqs);
+ init_timer(&local->sdreq_timer);
+ local->sdreq_timer.data = (unsigned long) local;
+ local->sdreq_timer.function = nfc_llcp_sdreq_timer;
+ INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
+
+ list_add(&local->list, &llcp_devices);
+
+ return 0;
+}
+
+void nfc_llcp_unregister_device(struct nfc_dev *dev)
+{
+ struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
+
+ if (local == NULL) {
+ pr_debug("No such device\n");
+ return;
+ }
+
+ local_cleanup(local);
+
+ nfc_llcp_local_put(local);
+}
+
+int __init nfc_llcp_init(void)
+{
+ INIT_LIST_HEAD(&llcp_devices);
+
+ return nfc_llcp_sock_init();
+}
+
+void nfc_llcp_exit(void)
+{
+ nfc_llcp_sock_exit();
+}

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